System Tray Delphi Application

Take a look at your Task Bar. See the area where the time is located? Are there any other icons there? The place is called the Windows System Tray. Would you like to place your Delphi applications icon there? Would you like that icon to be animated - or reflect the state of your application? This would be useful for programs that are left running for long periods of time with no user interaction (background tasks you typically keep running on your PC all day long). What you can do is to make your Delphi applications look as if they are minimizing to the Tray (instead of to the Task Bar, right to the Win Start button) by placing an icon in the tray and simultaneously making your form(s) invisible. Lets Tray It Fortunately, creating an application that runs in the system tray is pretty easy - only one (API) function, Shell_NotifyIcon, is needed to accomplish the task. The function is defined in the ShellAPI unit and requires two parameters. The first is a flag indicating whether the icon is being added, modified, or removed, and the second is a pointer to a TNotifyIconData structure holding the information about the icon. That includes the handle of the icon to show, the text to show as  a tool tip when the mouse is over the icon, the handle of the window that will receive the messages of the icon and the message type the icon will send to this window. First, in your main forms Private section put the line:TrayIconData: TNotifyIconData; type TMainForm class(TForm) procedure FormCreate(Sender: TObject); private TrayIconData: TNotifyIconData; { Private declarations }public{ Public declarations }end; Then, in your main forms OnCreate method, initialize the TrayIconData data structure and call the Shell_NotifyIcon function: with TrayIconData dobegin cbSize : SizeOf(TrayIconData); Wnd : Handle; uID : 0; uFlags : NIF_MESSAGE NIF_ICON NIF_TIP; uCallbackMessage : WM_ICONTRAY; hIcon : Application.Icon.Handle; StrPCopy(szTip, Application.Title); end; Shell_NotifyIcon(NIM_ADD, TrayIconData); The Wnd parameter of the TrayIconData structure points to the window that receives notification messages associated with an icon.   The hIcon points to the icon we want to add to the Tray - in this case, Applications main icon is used.The szTip holds the Tooltip text to display for the icon - in our case the title of the application. The szTip can hold up to 64 characters.The uFlags parameter is set to tell the icon to process application messages, use the applications icon and its tip. The uCallbackMessage points to the application-defined message identifier. The system uses the specified identifier for notification messages that it sends to the window identified by Wnd whenever a mouse event occurs in the bounding rectangle of the icon. This parameter is set to WM_ICONTRAY constant defined in the interface section of the forms unit and equals: WM_USER 1; You add the icon to the Tray by calling the Shell_NotifyIcon API function. The first parameter NIM_ADD adds an icon to the Tray area. The other two possible values, NIM_DELETE and NIM_MODIFY are used to delete or modify an icon in the Tray - well see how later in this article. The second parameter we send to the Shell_NotifyIcon is the initialized TrayIconData structure. Take One If you RUN your project now youll see an icon near the Clock in the Tray. Note three things.   1) First, nothing happens when you click (or do anything else with the mouse) on the icon placed in the Tray - we havent created a procedure (message handler), yet.2) Second, there is a button on the Task Bar (we obviously dont want it there).3) Third, when you close your application, the icon remains in the Tray. Take Two Lets solve this backward. To have the icon removed from the Tray when you exit the application, you have to call the Shell_NotifyIcon again, but with the NIM_DELETE as the first parameter. You do this in the OnDestroy event handler for the Main form. procedure TMainForm.FormDestroy(Sender: TObject);begin Shell_NotifyIcon(NIM_DELETE, TrayIconData);end; To hide the application (applications button) from the Task Bar well use a simple trick. In the Projects source code add the following line: Application.ShowMainForm : False; before the Application.CreateForm(TMainForm, MainForm); E.g let it look like: ...begin Application.Initialize; Application.ShowMainForm : False; Application.CreateForm(TMainForm, MainForm); Application.Run;end. And finally, to have our Tray icon respond to mouse events, we need to create a message handling procedure. First, we declare a message handling procedure in the public part of the form declaration: procedure TrayMessage(var Msg: TMessage); message WM_ICONTRAY; Second, the definition of this procedure looks like: procedure TMainForm.TrayMessage(var Msg: TMessage);begincase Msg.lParam of WM_LBUTTONDOWN: begin ShowMessage(Left button clicked - lets SHOW the Form!); MainForm.Show; end; WM_RBUTTONDOWN: begin ShowMessage(Right button clicked - lets HIDE the Form!); MainForm.Hide; end; end;end; This procedure is designed to handle only our message, the WM_ICONTRAY. It takes the LParam value from the message structure which can give us the state of the mouse upon the activation of the procedure. For the sake of simplicity well handle only left mouse down (WM_LBUTTONDOWN) and right mouse down (WM_RBUTTONDOWN). When the left mouse button is down on the icon we show the main form, when the right button is pressed we hide it. Of course, there are other mouse input messages you can handle in the procedure, like, button up, button double click etc. Thats it. Quick and easy. Next,  youll see how to animate the icon in the Tray and how to have that icon reflect the state of your application. Even more, youll see how to display a pop-up menu near the icon.

Gucci s Impact On The Fashion Industry - 1882 Words

Gucci happens to be one of the most sought after brands in the industry. The latter emanates from the fact that Gucci is classified as one of the most successful brands in the fashion industry, owing to the fact that its products are of top-notch quality (Bhasin). Being a household name for quite some time now, Gucci prides itself in having a huge customer base on the global scene especially after changing designers, a fact that contributes greatly to its increase in sales which translate to subsequent profits (Cartner-Morley; Bowles). While it can be arguably said that Gucci is a force to reckon with in the fashion scene, a lot of factors affect the operations of this company, both internally (micro) and externally (macro†¦show more content†¦In the same magazine, Gucci was listed as a very valuable fashion brand with estimate revenue of 12.7 Billion Dollars (Forbes). The two companies show a very spirited competition which is only demarcated by an estimated revenue differe nce of 5 billion dollars. This, then, means that with such high competition in the industry, Gucci can never, at any one time, sit pretty thinking that it runs the fashion scene – far from it – other worthy brands are selling out there – they have the ability to supersede Gucci in the short and long run. Potential of new entrants into the industry It indeed goes without saying that there already exist plenty of fashion companies and houses in the prevailing fashion industry (Pratap). What this says is that the industry allows for free and unrestrained entry into the market. Conversely, the potential of the likelihood of these new entrants to be worthy adversaries and competitors in the industry (Pratap). New entrants, as Pratap postulates, have mountains to move before they can be afforded a front row seat in the industry. 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Spirit Bound Chapter Twenty-Six Free Essays

MAYBE IT WAS SOMEONE’S SICK sense of humor, but I ended up in Dimitri’s now-vacated cell. I had come quietly after that guardian laid the charges before me. In fact, I’d become comatose because too much of what he’d said was impossible to process. We will write a custom essay sample on Spirit Bound Chapter Twenty-Six or any similar topic only for you Order Now I couldn’t even really get to the part about me. I couldn’t feel outrage or indignation over the accusation because I was still stuck on the part about Tatiana being dead. Not just dead. Murdered. Murdered? How had that happened? How had that happened around here? This Court was one of the most secure places in the world, and Tatiana in particular was always guarded–by the same group that had descended on Dimitri and me so quickly. Unless she’d left Court–and I was pretty sure she hadn’t–no Strigoi could have killed her. With the constant threats we faced, murder among dhampirs and Moroi was almost unheard of. Sure, it happened. It was inevitable in any society, but with the way ours was hunted, we rarely had time to turn on each other (shouting in Council meetings aside). That was part of why Victor had been so condemned. His crimes were about as bad as things got. Until now. Once I got past the impossible idea of Tatiana being dead, I was able to ask the real question: Why me? Why were they accusing me? I was no lawyer, but I was pretty sure calling someone a sanctimonious bitch was not hard evidence in a trial. I tried getting more details from the guards outside my cell, but they remained hard-faced and silent. After making my voice hoarse from shouting, I slumped onto the bed and went to Lissa’s mind, where I was certain I’d get more information. Lissa was frantic, trying to get answers from anyone she could. Christian was still with her, and they stood inside the foyer of one of the administrative buildings, which was filled with a flurry of activity. Dhampirs and Moroi alike ran everywhere, some frightened of this new government instability and others hoping to take advantage of it. Lissa and Christian stood in the midst of it all, like leaves swept along in a storm’s fury. While Lissa was now technically an adult, she had still always been under the wing of some older person at Court–usually Priscilla Voda, and occasionally even Tatiana. Neither of them was available now, for obvious reasons. While many royals respected her, Lissa had no real source to turn to. Seeing her agitation, Christian clasped her hand. â€Å"Aunt Tasha will know what’s going on,† he said. â€Å"She’ll turn up sooner or later. You know she won’t let anything happen to Rose.† Lissa knew there was a bit of uncertainty in that statement but didn’t mention it. Tasha might not want anything to happen to me, but she certainly wasn’t all-powerful. â€Å"Lissa!† Adrian’s voice caused both Lissa and Christian to turn around. Adrian had just entered, along with his mother. Adrian looked as though he had literally gone straight from my bedroom to here. He wore yesterday’s clothes, slightly rumpled, and his hair was styled with none of his usual care. By comparison, Daniella looked polished and put together, the perfect picture of a businesswoman who hadn’t lost her femininity. At last! Here were people who might have answers. Lissa rushed over to them gratefully. â€Å"Thank God,† Lissa said. â€Å"No one will tell us what’s happened†¦ except that the queen is dead and Rose is locked up.† Lissa looked up at Daniella’s face pleadingly. â€Å"Tell me there’s been some kind of mistake.† Daniella patted Lissa’s shoulder and gave as comforting a look as she could manage, given the circumstances. â€Å"I’m afraid not. Tatiana was killed last night, and Rose is their main suspect.† â€Å"But she would never have done that!† exclaimed Lissa. Christian joined her in righteous fury. â€Å"Her yelling at the Council that day isn’t enough to convict her for murder.† Ah, Christian and I had the same line of reasoning. It was almost scary. â€Å"Neither is crashing the Death Watch.† â€Å"You’re right. It’s not enough,† agreed Daniella. â€Å"But it doesn’t make her look good either. And apparently, they have other evidence they say proves her guilt.† â€Å"What kind of evidence?† Lissa demanded. Daniella turned apologetic. â€Å"I don’t know. That’s still part of the investigation. They’ll have a hearing to present the evidence and question her whereabouts, possible motives†¦ that kind of thing.† She glanced around at the people rushing by. â€Å"If they even get that far. This kind of thing†¦ it hasn’t happened in ages. The Council gains absolute control until a new monarch is elected, but there’s still going to be chaos. People are afraid. I won’t be surprised if the Court goes under martial law.† Christian turned to Lissa, hope on his face. â€Å"Did you see Rose last night? Was she with you?† Lissa frowned. â€Å"No. I think she was in her room. The last time I saw her was the day before yesterday.† Daniella didn’t look happy about that. â€Å"That’s not going to help. If she was alone, then she has no alibi.† â€Å"She wasn’t alone.† Three sets of eyes turned in Adrian’s direction. It was the first time he’d spoken since first calling to Lissa. Lissa hadn’t focused on him too much yet, meaning I hadn’t either. She’d only observed his superficial appearance when he arrived, but now she could see the little details. Worry and distress had left their marks, making him look older than he was. When she tuned in to his aura, she saw the usual gold of a spirit user, but it and its other colors were muddied and tinged with darkness. There was a flickering there too, a warning of spirit’s instability taking hold. This had all come about too quickly for him to react, but I suspected he’d hit the cigarettes and liquor as soon as he had a free moment. It was how Adrian coped with this sort of thing. â€Å"What are you saying?† Daniella asked sharply. Adrian shrugged. â€Å"She wasn’t alone. I was with her all night.† Lissa and Christian did a good job of maintaining neutral expressions, but Daniella’s face registered the shock that any parent would have upon hearing about her child’s sex life. Adrian noticed her reaction as well. â€Å"Save it,† he warned. â€Å"Your morals, your opinions†¦ none of it matters right now.† He gestured toward a group of panicked people running by, screaming about how Victor Dashkov must have surely come to Court to kill them all. Adrian shook his head and turned back to his mother. â€Å"I was with Rose. That proves she didn’t do it. We’ll deal with your motherly disapproval about my love life later.† â€Å"That’s not what worries me! If they do have hard evidence and you get mixed up in this, you could be under suspicion too.† The composure Daniella had entered with was beginning to crack. â€Å"She was my aunt,† cried Adrian incredulously. â€Å"Why on earth would Rose and I kill her?† â€Å"Because she disapproved of you dating. And because Rose was upset over the age ruling.† This came from Christian. Lissa glared, but he merely shrugged. â€Å"What? I’m just stating the obvious. Someone else would if I didn’t. And we all heard the stories–people have been making up things that are extreme even for Rose.† A strong comment indeed. â€Å"When?† asked Daniella, clutching Adrian’s sleeve. â€Å"When were you with Rose? When did you get there?† â€Å"I don’t know. I don’t remember,† he said. She tightened her grip. â€Å"Adrian! Take this seriously. This is going to make a huge difference on how things proceed. If you got there before Tatiana was killed, then you won’t be tied to it. If you were with Rose afterward–â€Å" â€Å"Then she has an alibi,† he interrupted. â€Å"And there’s no problem.† â€Å"I hope that’s true,† murmured Daniella. Her eyes didn’t seem focused on my friends anymore. The wheels in her head were spinning, her thoughts jumping ahead as she tried to think how best to protect her son. I had been an unfortunate case for her. He was, understandably, a red-alert emergency for her. â€Å"We’re still going to have to get you a lawyer. I’ll talk to Damon. I have to find him before the hearing tonight. And Rufus will have to know about this too. Damn.† Adrian arched an eyebrow at that. I had the impression Lady Ivashkov didn’t swear very often. â€Å"We have to find out what time you were there.† Adrian still wore his distress around him like a cloak and looked as though he might fall over if he didn’t get nicotine or alcohol soon. I hated to see him like that, particularly over me. There was strength within him, no question, but his nature–and the sketchy effects of spirit–made coping with this hard. Yet, through his agitation, he managed to pull up a memory to help his frantic mother. â€Å"There was someone in the building lobby when I came in†¦ a janitor or something, I think. No one at the front desk, though.† Most buildings usually kept a staff member around for emergencies or concierge services. Daniella’s face lit up. â€Å"That’s it. That’s what we’ll need. Damon will find out the time you were there so that we can get you free and clear of this.† â€Å"And so he can defend me if things turn bad?† â€Å"Of course,† she answered swiftly. â€Å"What about Rose?† â€Å"What about her?† Adrian still looked ready to fall apart, but there was seriousness and focus in his green eyes. â€Å"If you find out Aunt Tatiana was killed before I was there, and Rose is thrown to the wolves alone, will Damon be her lawyer?† His mother faltered. â€Å"Oh, well, darling†¦ Damon doesn’t really do that sort of thing†¦.† â€Å"He will if you ask him to,† said Adrian sternly. â€Å"Adrian,† she said wearily, â€Å"you don’t know what you’re talking about. They say the evidence against her is bad. If our family’s shown supporting–â€Å" â€Å"It’s not like we’re supporting murder! You met Rose. You liked her. Can you look me in the eye and say it’s okay for her to go in with whatever half-assed defense they dredge up for her? Can you?† Daniella blanched, and I swear, she actually cringed away. I don’t think she was used to such fierce resoluteness from her devil-may-care son. And though his words were perfectly sane, there was kind of a crazy desperation in his voice and attitude that was a little scary. Whether that was caused by spirit or just his own emotion, I couldn’t say. â€Å"I†¦ I’ll speak to Damon,† Daniella said at last. She’d had to swallow a few times before actually getting the words out. Adrian let out a deep breath and some of that fury went with it. â€Å"Thank you.† She scurried away, melting into the crowd and leaving Adrian alone with Christian and Lissa. The two of them looked only a little less stunned than Daniella had. â€Å"Damon Tarus?† Lissa guessed. Adrian nodded. â€Å"Who’s that?† asked Christian. â€Å"My mom’s cousin,† said Adrian. â€Å"The family lawyer. A real shark. Kind of sleazy too, but he can pretty much get anyone out of anything.† â€Å"That’s something, I suppose,† mused Christian. â€Å"But is he good enough to fight this so-called hard evidence?† â€Å"I don’t know. I really don’t know.† Adrian absentmindedly reached for his pocket, the usual cigarette spot, but he had none today. He sighed. â€Å"I don’t know what their evidence is or how Aunt Tatiana even died. All I heard was that they found her dead this morning.† Lissa and Christian exchanged grimaces. Christian shrugged, and Lissa turned back to Adrian, taking on the role of messenger. â€Å"A stake,† said Lissa. â€Å"They found her in bed with a silver stake through her heart.† Adrian said nothing, and his expression didn’t really change. It occurred to Lissa that in all this talk about innocence, evidence, and lawyers, everyone had kind of overlooked the fact that Tatiana had been Adrian’s great-aunt. He hadn’t approved of some of her decisions and had made plenty of jokes about her behind her back. But she was still his family, someone he’d known his entire life. He had to be feeling the pain of her death on top of everything else. Even I felt a little conflicted. I hated her for what she’d done to me, but I’d never wanted her dead. And I couldn’t help but remember that she’d occasionally spoken to me like I was a real person. Maybe it had been faked, but I was pretty sure she’d been sincere the night she’d stopped by the Ivashkovs’. She’d been weary and thoughtful, mostly just concerned about bringing peace to her people. Lissa watched Adrian go, sympathy and sorrow flooding through her. Christian gently tapped her arm. â€Å"Come on,† he said. â€Å"We’ve found out what we needed to know. We’re just in the way here.† Feeling helpless, Lissa let him lead her outside, dodging more panicked crowds. The orange of a low sun gave every leaf and tree a golden, warm feel. There had been a lot of people out when we returned from the warehouse with Dimitri, but it was nothing compared to this. People were buzzing with fear, hurrying to pass the news. Some were already in mourning, clad in black, with tears on their faces. I wondered how much of that was real. Even in the midst of tragedy and crime, royals would be scrambling for power. And each time she heard my name, Lissa would grow more and more angry. It was the bad anger too, the kind that felt like black smoke in our bond and often made her lash out. It was spirit’s curse. â€Å"I can’t believe this!† she exclaimed to Christian. I noticed, even if she didn’t, that he was hurriedly taking her somewhere where there weren’t people. â€Å"How could anyone think that about Rose? It’s a set up. It has to be.† â€Å"I know, I know,† he said. He knew spirit’s danger signs too and was trying to calm her down. They’d reached a small, grassy area in the shade of a large hazelnut tree and settled onto the ground. â€Å"We know she didn’t do it. That’s all there is to it. We’ll prove it. She can’t be punished for something she didn’t do.† â€Å"You don’t know this group,† grumbled Lissa. â€Å"If someone’s out to get her, they can make all sorts of things possible.† With only the faintest awareness, I drew a little of that darkness from her into me, trying to calm her down. Unfortunately, it just made me angrier. Christian laughed. â€Å"You forget. I grew up around this group. I went to school with this group’s kids. I know them–but we’re not panicking until we know more, okay?† Lissa exhaled, feeling much better. I was going to take too much darkness if I wasn’t careful. She gave Christian a small, tentative smile. â€Å"I don’t remember you being this reasonable before.† â€Å"It’s because everyone has different definitions of ‘reasonable. ‘ Mine’s just misunderstood, that’s all.† His voice was lofty. â€Å"I think you must be misunderstood a lot,† she laughed. His eyes held hers, and the smile on his face transformed into something warmer and softer. â€Å"Well, I hope this isn’t misunderstood. Otherwise, I might get punched.† Leaning over, he brought his lips to hers. Lissa responded with no hesitation or thought whatsoever, losing herself in the sweetness of the kiss. Unfortunately, I was swept along with it. When they pulled away, Lissa felt her heart rate increase and her cheeks flush. â€Å"What exactly was that the definition of?† she asked, reliving how his mouth had felt. â€Å"It means ‘I’m sorry,'† he said. She looked away and nervously plucked at some of the grass. Finally, with a sigh, she looked back up. â€Å"Christian†¦ was there ever†¦ was there ever anything between you and Jill? Or Mia?† He stared in surprise. â€Å"What? How could you think that?† â€Å"You spent so much time with them.† â€Å"There is only one person I have ever wanted,† he said. The steadiness of his gaze, of those crystal blue eyes, left no question as to who that person was. â€Å"No one else has ever come close. In spite of everything, even with Avery–â€Å" â€Å"Christian, I’m so sorry for that–â€Å" â€Å"You don’t have to–â€Å" â€Å"I do–â€Å" â€Å"Damn it,† he said. â€Å"Will you let me finish a sent–â€Å" â€Å"No,† Lissa interrupted. And she leaned over and kissed him, a hard and powerful kiss that burned through her body, one that told her there was no one else in the world for her either. Well. Apparently Tasha had been right: I was the only one who could bring them back together. I just somehow hadn’t expected my arrest to play a role. I pulled away from her head to give them some privacy and save myself from watching them make out. I didn’t begrudge them their moment. There was nothing either could do for me right now, and they deserved their reunion. Their only course of action was to wait for more information, and really, their method of passing time was a lot healthier than whatever Adrian was probably doing. I lay down on the bed and stared up at the ceiling. There was nothing but plain metal and neutral colors around me. It drove me crazy. I had nothing to watch, nothing to read. I felt like an animal trapped in a cage. The room seemed to grow smaller and smaller. All I could do was replay what I’d learned via Lissa, analyzing every word of what had been said. I had questions about everything, of course, but the one thing that stuck with me was Daniella mentioning a hearing. I needed to know more about that. I got my answer–hours later. I’d fallen into sort of a numb haze by then and almost didn’t recognize Mikhail standing in front of my cell door. I leapt from my bed to the bars and saw that he was unlocking the door. Hope surged through me. â€Å"What’s going on?† I asked. â€Å"Are they letting me go?† â€Å"I’m afraid not,† he said. His point was proven when, after opening the door, he promptly put my hands in cuffs. I didn’t fight it. â€Å"I’m here to take you to your hearing.† Stepping into the hall, I saw other guardians gathered. My own security detail. A mirror of Dimitri’s. Lovely. Mikhail and I walked together, and mercifully, he spoke along the way instead of maintaining that awful silence that seemed to be common treatment for prisoners. â€Å"What’s the hearing exactly? A trial?† â€Å"No, no. Too soon for a trial. A hearing decides whether you’re going to trial.† â€Å"That sounds kind of like a waste of time,† I pointed out. We emerged from the guardians’ building, and that fresh, damp air was the sweetest thing I’d ever tasted. â€Å"It’s a bigger waste of time if you go to a full-fledged trial, and they realize there was no case to stand on. At the hearing, they’ll lay out all the evidence they have, and a judge–or, well, someone acting as a judge–will decide if you should have a trial. The trial makes it official. That’s where they pass the verdict and dole out the punishment.† â€Å"Why’d they take so long for the hearing? Why’d they make me wait in that cell all day?† He laughed, but not because he thought it was funny. â€Å"This is fast, Rose. Very fast. It can take days or weeks to get a hearing, and if you do go to trial, you’ll stay locked up until then.† I swallowed. â€Å"Will they move fast on that too?† â€Å"I don’t know. No monarch’s been murdered in almost a hundred years. People are running wild, and the Council wants to establish order. They’re already making huge plans for the queen’s funeral–a giant spectacle that’ll distract everyone. Your hearing is also an attempt to establish order.† â€Å"What? How?† â€Å"The sooner they convict the murderer, the safer everyone will feel. They think this case against you is so solid, they want to rush it through. They want you to be guilty. They want to bury her knowing her killer is moving toward justice, so that everyone can sleep easy when the new king or queen is elected.† â€Å"But I didn’t–† I let my denial go. There was no point. Ahead of us, the building that housed the courtroom loomed. It had seemed forbidding the first time I’d been here for Victor’s trial, but that had been owing to fear of the memories he sparked in me. Now†¦ now it was my own future on the line. And apparently not just my own future–the Moroi world was watching and waiting, hoping I was a villain who could be safely put away forever. Swallowing, I gave Mikhail a nervous look. â€Å"Do you think†¦ do you think they’ll send me to trial?† He didn’t answer. One of the guards held the door open for us. â€Å"Mikhail?† I urged. â€Å"Will they really put me on trial for murder?† â€Å"Yes,† he said sympathetically. â€Å"I’m pretty sure they will.† How to cite Spirit Bound Chapter Twenty-Six, Essay examples

Rainforest Depletion Essay Example For Students

Rainforest Depletion Essay Long ago, the Earth had a green belt of rain forests around its middle that covered almost twelve percent of the earths land surface.(Miller ; Berry 3) Today, the rain forest covers two percent of the earths land surface and it is declining rapidly. The following will be a description of the rain forest, factors in its destruction, and if there are any answers to slow or halt the process. Today, as we enter the last decade of the twentieth century, we have reached a turning point; we can no longer use the excuse of ignorance.(Hammond 2) People need to try harder to stop rain forest depletion. There are two major areas on earth where rain forests are located. One of these areas is called The Old World Tropics, which includes Africa and Asia. In Africa, the rain forests are primarily located around the Zaire river. The other area in which rain forests are located is called The New World Tropics, which contains Central and South America. The New World tropics are in lower altitudes as opposed to the Old World tropics, which are at higher altitudes. Rain forests are located around the equator. This location of the rain forests makes them warm and humid all year round. There are never cold winters in the rain forests. During winter in the rain forests, people comfortably are able to wear T-shirts and shorts. The rain forest has a rainy season which usually lasts most of the year. The rain forests of the world are home to more than half of the animal species that live on earth.(CSIRO 1) Many of these creatures are some of the most beautiful and odd creatures in the world, Such as the large rodent Capybara, the Anteater, and many different colorful exotic birds. There are many beautiful creatures living in our Earths rain forests. Many people are ignorant to the effects of rain forest depletion on our environment, and this ignorance is a major cause in the beginning of the destruction of the rain forests. European settlers exploited the rain forests for timber and cleared them for agricultural purposes.(Parish 4) The name scrub, which was originally applied to the rain forest by European settlers, became a term for land seen as useless until subject to ax, fire, and plough.(Parish 4) People did not think of the affects on the environment because the little knowledge that was known about the affects was not very widespread. Another cause in the destruction of the rain forest is peoples values. Many people value species according to their worth to human beings.(Miller Berry 3) People often ignore the problems with the environment simply because they do not want to deal with it. Natural checks against over exploitation have been ignored because those who are now consuming the products of the rain forest are not those who experience the immediate effects of its degredation.(Hammond 2) Many people believe that they will not live long enough to face the consequences of the destruction but they do not realize how fast the rain forests are depleting. Recently in Borneos Sarawak rain forest, 24 cavers and scientists are braving the rain forests elements and creatures to save the regions natural riches. The cavers and scientists are trying to find plant and animal life diverse enough to protect it from mining and to declare it a national park. Whether the government sets aside the area this year, in five years or never depends on whats discovered out there.(Webster 5) This is a case that often occurs in rain forests.Many governments see no reason to protect the rainforest unless there is an important plant or creature that lives in it. With chain saws, bulldozers, and other powerful equipment, we can bring the giant trees of the rain forest, the very symbol of strength and majesty, crashing to the ground from their lofty heights in just a few hours.(Miller ; Berry 3) All of this destruction and havoc is leading our world straight into events that will threaten life on earth itself. Some of the possible results in the future if the depletion does not stop immediately are global warming and increasing ultra violet radiation as the ozone layer of the atmosphere thins. Already 80 percent of rain forest frogs and forty percent of rain forest birds are rare, declining or threatened with distinction.(Parish 4) This is eighty percent of the frogs and forty percent of the birds which are a part of the fifty percent of Earths entire animal species. The depletion of tropical species effects much of the biodiversityof rain forests, which is the variety of living things.(Miller Berry 3) The variety of living things and preserving their environment is very necessary in the survival of life. People sometimes become more interested in protecting individual species of animals that may be endangered than preserving the animals habitats, which are so necessary for survival.(Miller Berry 3)Hope in repairing the damage done to the rain forests unfortunately leads to unpleasant news. Trying to repair the damage would be like try ing to put a band aid over a gaping wound. While we cannot rebuild the rain forests, scientists believe it may be possible to establish small islands of artificial rain forests using tree planting of a range of rain forest tree species.(CSIRO 1) The best solution in the present to maintain and preserve our environment is to merely put a stop to chopping, burning and literally torturing Earths rain forests. If the destruction would stop now life on Earth would be much more prolonged. .ua7b358f2990087a893817ebf5158f88a , .ua7b358f2990087a893817ebf5158f88a .postImageUrl , .ua7b358f2990087a893817ebf5158f88a .centered-text-area { min-height: 80px; position: relative; } .ua7b358f2990087a893817ebf5158f88a , .ua7b358f2990087a893817ebf5158f88a:hover , .ua7b358f2990087a893817ebf5158f88a:visited , .ua7b358f2990087a893817ebf5158f88a:active { border:0!important; } .ua7b358f2990087a893817ebf5158f88a .clearfix:after { content: ""; display: table; clear: both; } .ua7b358f2990087a893817ebf5158f88a { display: block; transition: background-color 250ms; webkit-transition: background-color 250ms; width: 100%; opacity: 1; transition: opacity 250ms; webkit-transition: opacity 250ms; background-color: #95A5A6; } .ua7b358f2990087a893817ebf5158f88a:active , .ua7b358f2990087a893817ebf5158f88a:hover { opacity: 1; transition: opacity 250ms; webkit-transition: opacity 250ms; background-color: #2C3E50; } .ua7b358f2990087a893817ebf5158f88a .centered-text-area { width: 100%; position: relative ; } .ua7b358f2990087a893817ebf5158f88a .ctaText { border-bottom: 0 solid #fff; color: #2980B9; font-size: 16px; font-weight: bold; margin: 0; padding: 0; text-decoration: underline; } .ua7b358f2990087a893817ebf5158f88a .postTitle { color: #FFFFFF; font-size: 16px; font-weight: 600; margin: 0; padding: 0; width: 100%; } .ua7b358f2990087a893817ebf5158f88a .ctaButton { background-color: #7F8C8D!important; color: #2980B9; border: none; border-radius: 3px; box-shadow: none; font-size: 14px; font-weight: bold; line-height: 26px; moz-border-radius: 3px; text-align: center; text-decoration: none; text-shadow: none; width: 80px; min-height: 80px; background: url(https://artscolumbia.org/wp-content/plugins/intelly-related-posts/assets/images/simple-arrow.png)no-repeat; position: absolute; right: 0; top: 0; } .ua7b358f2990087a893817ebf5158f88a:hover .ctaButton { background-color: #34495E!important; } .ua7b358f2990087a893817ebf5158f88a .centered-text { display: table; height: 80px; padding-left : 18px; top: 0; } .ua7b358f2990087a893817ebf5158f88a .ua7b358f2990087a893817ebf5158f88a-content { display: table-cell; margin: 0; padding: 0; padding-right: 108px; position: relative; vertical-align: middle; width: 100%; } .ua7b358f2990087a893817ebf5158f88a:after { content: ""; display: block; clear: both; } READ: All the presidents men AP Government paper EssayIf every person in the world knew about the rain forest being destroyed and the future effects, destruction would not be tolerated.Humans cannot understand what they do not know. People who do not know what is going on do not see anything wrong with the destruction of the rain forests. Education about the rain forest needs to be spread in order for humankind to understand it. The rain forest is a very beautiful and mystical place. It is full of wonders and creatures that look as if they are imaginary and were derived from a dream. It has so much meaning to our world that it is hard to imagine why people would destroy it. People may think that they are just rain forests, and if they were destroyed, they would be the only thing destroyed. The Earth must really love its rain forests because if they go, so does the earth. Destroying the rain forests is like taking away the earths imagination and ability to dream. People have to seek harder to stopping the rain forests damage. If every person just stopped and stepped out of their busy worlds of business and society , and would take some time to give a little bit of money or spread the word, they could buy our rain forests peace. Solving the rain forest problem could be one of the biggest steps ahead in history, the time when humans stepped together to right their wrong. Bibliography:Cindy- here is my college schedule:Monday9:50-1:50 classes3:00 come home or to workTuesday10-11:15 class12:15 come home or to workWednesday9:00-1:50 classes3:00 come home or to workThursday9:00-11:15 classes12:15 come home or to workFriday9:00-3:50 classes5:00 come home or to workI probably will want no more than sixteen hours a week.

Trace of Arsenic Essays - Natural Environment, Food And Drink, Water

Trace of Arsenic Rice is a dietary staple, especially those of certain cultures. A variety of baby foods and formulas contain arsenic, which can be harm young children because of their underdeveloped brains and bodies. High-end organic formulas and baby foods contain high levels of arsenic. Developed humans are also affected. Levels of arsenic in rice have been linked to the genetic damage in humans and can increase the risk of cancer. Arsenic mixes into organic or inorganic compounds by seeping into water supplies, traveling through the wind, or spreading through industrial use. Evidence of Harm There have been multiple health outbreaks in areas including Bangladesh and Antofagasta. These outbreaks have been led to arsenic contaminated wells which people use for drinking water. Those exposed to the drinking water in Antofagasta had higher rates of bladder and lung cancer. Arsenic caused many deaths among Antofagastans age 30 and older. Arsenic is one of the most toxic substances and has caused health effects. The Rice Connection Andrew Meharg was studying the environmental effects of arsenic in Bangladesh when a student noted that rice was being irrigated with vast quantities of arsenic-contaminated water. Rice is a dietary staple. It is used for rice flour, malt, bran, pasta, noodles, breakfast cereals, cereal bars, crackers, rice cakes and more. Rice plants took up inorganic arsenic from water and soil with dismaying efficiency: at 10 times the rate of other grains. Health Food Surprise In 2008, Meharg reported that arsenic in baby rice cereal sold in the U.K. exceeded safety levels set for drinking water by both the U.S. and the European Union. The Dartmouth researchers realized that all kinds of baby formulas and foods contained rice; many were thickened with rice starch. Although the teams initial tests found barely a trace of arsenic in baby formula and pureed baby food, later tests showed that two organic toddler formulas contained up to 60 ppb of arsenic (adjusted for dilution) six times the EPA safety limit for water. Labels on the formula canisters told why: They were sweetened with organic brown rice syrup, considered a healthy alternative to corn syrup. And while brown rice syrup is rare in baby foods, it is common in crackers, cereals, snack bars, energy bars and many products marketed as health foods. The Risks of Imported Food Almost 15 percent of foods consumed in the U.S. come from outside the country. penetration from overseas is so vast and complex that a single product might contain ingredients from multiple countries, a fact you would never discern from labeling on the food itself. Its risky. Every food factory in the U.S. is supposed to undergo rigorous inspection. Once imported foods reach our shores, they enter the distribution chain with little fanfare and scrutiny; some argue they are barely vetted at all. Instead, by and large, problems come to light when Americans get sick. Part of the problem is the lack of resources we ourselves direct to food from abroad: The FDA has a minuscule team of some 1,500 inspectors devoted to food imports, a workforce too small to screen more than a tiny fraction of the food that arrives at U.S. ports each year for microbial pathogens or other disease-causing contaminants Underwater Robots Patrol the Red Tide of Harmful Algal Blooms Concentrations of algae in our oceans and lakes have long bloomed naturally, but climate change and fertilizer runoff from farms have exacerbated the situation in recent years. The outcome: algal blooms so massive that ecosystems turn into dead zones, resource-poor realms inhospitable to other life. The most dangerous of the blooms, called harmful algal blooms, or HABs, are often reddish in color, leading observers to call them red tides. The dangers are as ominous as the name. Some of the algae, or phytoplankton, manufacture saxitoxin, a poison so devastating it is the underlying cause of paralytic shellfish poisoning, an often-lethal reaction to shellfish that are storing toxic algal cells. This January, two people in Malaysia died after eating cockles tainted with the stuff. Other phytoplankton produce domoic acid, a neurotoxin that kills people, birds and marine mammals snacking on contaminated fish and shellfish. . The fight against red tides may be taking place one algal and shellfish species at a time. Elsewhere in

Sauders 2003 Essay Example

Sauders 2003 Essay Example Sauders 2003 Essay Sauders 2003 Essay Saunders et al. 2003, p. 83 -The Research Process â€Å"Onion† Having defined the research question and the overall research design for this study, the next step is to discuss the design in more detail: the research philosophy, the research approach and research strategies used. Much literature is available on research philosophies, approaches and strategies. Saunders et al. (2003) define the socalled research process ‘onion’, consisting of five different layers, as in Figure 2-3. Part 2 As approaches in the different layers have dependencies, they suggest a research design should be developed from the top down, starting with the outside layer [adopting a research RESEARCH DESIGN philosophy] and thereafter peeling away each layer until the fifth layer is reached [defining data collection methods]. This approach, also suggested by Remenyi et al. (2000), is used in this study. Part 3 A positivistic philosophy aims at the derivation of laws or law-like gen eralizations similar to those in the physical and natural sciences (Remenyi et al. 000, p. 32). Quantitative research allows researchers to familiarize themselves with the problem or concept to be studied. The emphasis is on facts and causes of behaviour (Bogdan and Biklen 1988), with the information in the form of numbers that can be quantified, and summarized using a mathematical process for analysing the numeric data and expressing the final result in statistical terminology (Charles 1995). Part 4 The realistic philosophy shares two features with a positivism philosophy: a belief that the natural and the social sciences should apply the same kinds of approach to the collection of data and to explanation, and a commitment to the view that there is an external reality to which scientist direct their attention (Bryman 2001). Saunders et al. 2003, p. 83 The Research Process â€Å"Onion†

Benifits and Disadvantages of Coaching PowerPoint Presentation

Benifits and Disadvantages of Coaching - PowerPoint Presentation Example Knowledge gets transferred from one individual to another through the process of coaching. It is partly different from teaching in that in coaching, the tutor essentially adopts such a behavior that makes him/her the role model for the learners whereas in the course of learning, the tutor just has more knowledge about the subject as compared to the learners. He/she may not at all be involved in the subject of discussion. All that matters is the conveyance of knowledge to the learners whereas in coaching, the coach essentially tells the followers how to do a certain task. It involves display of certain characteristics that are consistent with the demand of the subject of discussion. Therefore, a coach assumes the responsibility to behave and act professionally so that he/she may rationally decide what to deliver when, how and how much. The same professionalism is inculcated in the followers as they accede to the instructions of the coach. Coaching provides the learners with an opportu nity to identify their weaknesses and discover their strengths with the guidance of the coach. Coaching is a coherent process whose various stages are sensibly linked to each other. In the initial stage of coaching, the coach tells the followers what is expected of them once they master a certain art.

Are there any reasons, beyond the purely aesthetic, for us to be Essay

Are there any reasons, beyond the purely aesthetic, for us to be interested in the sounds of animals - Essay Example There are also arguments by Rothenberg (2013) that opine humans got their notion of dance, rhythm and synchronisation from insect sounds that have surrounded them through millions of years of evolution. Essentially, animal and insect sounds have shaped human sounds. He claims that the sound of insects has acted as a soundtrack for humanity in its entire history and presently, the sounds insects and animals produce are inextricably linked with humanity. From this perspective, this paper will research on the relationship and answer the question â€Å"are there any reasons, beyond the purely aesthetic, for us to be interested in the sounds of animals?† Sound can either be audible or inaudible to the human ear. Inaudible sound is further categorised as infrasound (those below 20 hertz) and ultrasounds (those above 20 kilohertz). The human inner ear has a spiral sheet on which sound plucks synonymously to the way guitar strings are plucked and fires the brain cells that constitute the hearing parts of the brain. When the firing pattern is varied, different cell ensembles are excited and the sounds associated to past experiences, thoughts and feelings. Animal sound is natural in the sense that they are generated by the animals in their normal soundscape (Seyfarth, Cheney & Fischer, 2010). Apart from humankind having the unique ability to understand or identify with the needs most animals, listening to their sounds is one of the key ways of understanding such needs (Rothenberg, 2013). This can also be viewed from the perspective that humans know relatively little on other creatures’ sensory world but, apart from visually, they can interact with them by listening to the sounds they make. Most of the sounds and the vocalizations animals produce are specialised for communication with other animals belonging to the same species. In mammals, sound is produced in the vocal chords (larynx) while birds use a special organ known as the syrinx to produce their songs.

Assignment-Oppression-Race, Class.And Gender in United States Coursework

Assignment-Oppression-Race, Class.And Gender in United States - Coursework Example The oppressed are treated cruelly and unjustly by those who have authority over them. For example, the poor continue to be oppressed as they have no means of getting out of their predicament. Tatum (2010) defines racism as a system of advantage based on race. Based on their color, the blacks are considered inferior than the whites due to racial prejudice. They are considered as not able to achieve much of the superior race of whites have been able to achieve hence are discriminated in all aspects; they cannot get good jobs, housing, and education among other aspects. Furthermore, the whites claim their privileges and advantages are biological in nature hence not racist; it is not their fault that they are advantaged. The blacks are blamed for their predicament in most cases as they are stereotyped as not willing to improve themselves and lack initiative. According to Hubbard (2010), human sexuality is not natural but a social construction in which children are socialized from birth. Traditionally, family roles were divided according to gender type. Some roles like hunting were solely for men while others like kitchen work was reserved for women and men were regarded as superior than women. Sexism is therefore the belief that one sex (male) is superior to the other (female) hence has the right to dominate almost all aspects of life. Women are discriminated against based on their sex due to gender stereotyping. For example, even with more women acquiring similar education levels as men, women still get absorbed in the lowly paid service sector while men join highly paid sectors such as engineering. Classism refers to the differences that exist between different groups in the society such that the dominant group oppresses the lower classes (Mantiosis 2010). He asserts that the society is divided into the wealthy class, middle class and the poor and acknowledges the fact that a wide gap exists between the rich and the poor in America contrary to a

Carbon Nanotubes for Nano-particle Field Extraction Thruster

Carbon Nanotubes for Nano-particle Field Extraction Thruster Using carbon nanotubes as propellant for nano-particle field extraction thrusters Stefan Seuleanu Introduction Carbon nanotubes have been a research focus for more than two decades due to their unique physical properties and have been used so far in a variety of appli- cations. A possible application of carbon nanotubes is their use as propellant for an electric propulsion prototype, the nano-particle field extraction thruster (nanoFET). The nanoFET accelerates and ejects conductive particles in order to provide thrust1 . Its main advantage over other electric propulsion systems, such as ion or arcjet thrusters, is its variable specific impulse and thrust, while maintaining a high internal efficiency1 . Theoretically, the nanoFET propulsion system can be used for a large range of orbital and deep space exploration sit- uations, offering the possibility of decoupling the spacecraft design from the propulsion system4 . However, to date, nanoFETs have not been researched ex- tensively and much of the experimental work is still to be expected. This paper will investigate the possibility of using carbon nanotubes as nanoFET propel- lant by considering their relevant physical properties. By understanding how the nano-particle field extraction thruster works,this account also motivates the use of carbon nanotubes as propellant, despite their current high price. Properties and characteristics of CNTs Firstly, it is important to understand the relevant characteristics that make CNTs desirable for the nanoFET propulsion system. A carbon nanotube is a tubular/cylindrical structure that can be visualized as a wrapped sheet of graphene (one atom thick, two dimensional carbon based hexagonal lattice). Their size is typically a couple of nanometers in diameter and can span many micrometers in length. Carbon nanotubes can be single-walled (SWNTs) or multi-walled (MWNTs). These two characteristics will determine their aspect ratio (ratio between length and diameter), which is generally very high. As will be explained later on, the aspect ratio is a determinant factor that influences the nanoFET performance2,3 . The geometric structure of the nanotube determines its electrical properties. Based on the chiral vector (n,m), illustrated below, there are three main types of CNTs: zigzag, armchair and chiral. When n − m is a multiple of three, then the CNT is metallic, and semiconducting otherwise. Due to their geometry, armchair CNTs are always metallic, while the other types can be metallic only with the right choice of (n,m). Because there is no exact way to synthesize carbon nanotubes of only one geometry, as expected, generally one third of the synthesized CNTs are metallic and the rest are semiconducting 2,3 . Figure 1: CNT type depends on the chiral vector2 . Regarding the nanoFETs, the desired CNTs are the metallic type which implies the necessity for prior sorting before use. Moreover, the synthesized CNTs can contain geometrical †defects† that can be manipulated to improve the thruster’s performance3 . Due to the fact that the CNTs’ structure/geometry minimizes the collisions between conducting electrons, the resulting metallic tubes are highly conductive. Another characteristic is determined by the strong carbon bonds that allow high current to flow at low resistivity. This properties will become relevant when explaining the charging stage of the nanoFET 2,3 . The stages of a nanoFET The acceleration of a particle by a nanoFET can be divided into several stages. By assuming that the particles have been already sorted for the desired thrust, the first stage is the transportation of the particles to the charging pad. The transportation of the particles can be achieved either trough a dielectric fluid or through back pressure, hence the difference between wet nanoFETs and dry nanoFETs. For the purpose of this paper only the wet nanoFETs will be con- sidered, as the research done into dry nanoFETs has so far been minimal. The transportation liquid used for the proof-of-concept tests was silicon oil. After the particle is transported to the charging pad, the next stage is the charging process . Here the conductive particle is electrostatically charged to a desired level 5,6,8 . Figure 2: Single nanoFET emission channel cross section5 The next phase is the lift-off and extraction, which represents the application of an electric field, a potential bias between the electrode and the acceleration gates, such that the particle leaves the charging pad and moves upwards towards the liquid’s surface. At the surface, the particle must overcome the surface tension and get extracted from the liquid. After the extraction, the next stage is the acceleration of the particle trough several stacked gates. The gates have alternating insulating and conductive layers, each providing in theory an electric potential of 1000V, leading to a total of 10,000V potential that accelerates a particle to approximately 10km/s. The particle is finally ejected out of the nanoFET and thrust is produced5,6,7 . Particle behavior in nanoFETs In order to understand the behavior of the particle in a gravitational setting compared to a micro-gravitational setting, it is important to identify the forces that act on the particle at different stages in the nanoFET. The four main forces acting on a particle in a gravitational setting are the electrostatic force, the buoyant force, gravitational force and the drag force. As the cylindrical particle is transported to the charging pad, the liquid provides a horizontal inertial force. This horizontal inertial force is assumed to be low and therefore ignored in the calculations. After the nanoparticles are transported to the charging pad (electrode), they are electrostatically charged; thus contact with the electrode is necessary. If the contact is horizontal, along the length, then the charge of the particle is described by6 .: q0,cy−h = 2Ï€rlÃŽ µl El However if the contact is at either ends, so the particle is vertical on the electrode, the charge is the following6 .: l2 q0,cy−v = Ï€ ln( 2l ÃŽ µl El When the cylindrical particle is vertical on the charging pad, it gains more charge and it also requires less electric field to move upwards, as seen in the figure below6 . Figure 3: Vertically vs horizontal oriented particles a) ratio of acquired particle charge; b) ratio of required lift-off electric field6 In order to orient a particle from horizontal to vertical on the charging pad, an intense electric field focused only at one of the particle’s ends is applied. The fabrication defects that are usually present at the ends of CNTs may help to change the orientation of the particle on the electrode, requiring less electric field to create a moment that rotates the CNTs vertically. Additionally to the gravitational force, while still on the charging pad, the particle has to overcome the adhesion and electric image force in order to achieve vertical lift-off5,6 . After the particle leaves the charging pad, it has to move vertically trough the viscous liquid to the liquid surface. Therefore, the adhesion force and the electric image are no longer present; however the drag force now slows the particle’s movement. For a cylindrical particle the formula for the fluid drag used in the nanoFET calculations is given by6 : 2π µl lv D = ln( l ) + 0.193 While moving through the liquid, the particle loses charge as described by q(t) = q0 exp(− t ), where Ï„ = ÃŽ µl 5,6 . Because the particle moves fast through Ï„ ÏÆ'l the liquid, the charged loss is overall assumed to be negligible. Generally, the particle’s equation of motion is described by6 : dv (mp + K ml ) dt = q(t)El − D + Fbuoyant − W. The above equation also takes in account the added mass that is accelerated with the particle where K is a coefficient that depends on the geometry of the particle, while mp is the mass of the particle and ml is the mass of the liquid. In a laboratory gravitational environment the gravitational forces are minimal compared to the dominant drag and electrostatic forces. In a micro-gravitational environment the gravitational force and the buoyant force can be neglected5,6 . Performance and particle size For characterizing the performance of the nanoFET electric propulsion system, the space industry uses specific impulse and thrust-to-power ratio as indica- tors of performance. The specific impulse is the impulse delivered per unit of propellant consumed. In order to achieve a certain thrust, the systems that have higher specific impulse consume less propellant than the ones with lower specific impulse. For the nanoFET system the specific impulse increases as the charge-to-mass ratio of the particle increases. Thurst-to-power ratio describes the amount of thrust outputted for a specific power provided4,6 . 1 q 1 T 2 mp 1 Isp = 0 (2Vo p ) 2 ; = ( ) 2 P Vo q Moreover, the internal efficiency is given by4,6 : 1 T ÃŽ ·int = 2 g0 P Isp There are several factors that can influence the performance or the mode of operation of the nanoFET. First of all, the horizontal inertial force that the particle gains from the transportation liquid is assumed to be negligible. How- ever, this is not necessarily the case and further research needs to be conducted in order to determine its influence. Another important factor is the presence of Taylor cones and surface instability when a high electric field is present near the liquid’s surface. These cones can eject droplets and reduce the performance of the nanoFET. In order to mitigate the surface instability and the ejection of droplets, an experiment has been done to analyze how different particle shapes influence the minimum electric field needed for the extraction process. The ex- periment consists of various vacuum electric fields applied to spherical 800 µm and cylindrical 300 µm diameter and 1.5mm length aluminium particles with a total silicon oil fluid gap of 12 .7mm. As seen in the figure below, cylindrical particles can be extracted before the Taylor cones form5,6,7, . Figure 4: Taylor cone formation and particle extraction6 Furthermore, further study into the charge-to-mass ratio revealed that, for cylindrical particles, charge-to-mass ratio increases as aspect ratio increases. Therefore, at large aspect ratios, the needed extraction electric field decreases as seen in the following figure. For this reason increasing the aspect ratio of the particles increases in turn the Isp and the overall internal efficiency6 . A good candidate for further research are the CNTs due to their cylindrical Figure 5: Cylindrical particles’ vacuum extraction field simulations6 shape, high aspect ratio, good charge-to-mass ratio and fast charging. By choos- ing different CNT sizes to be used with variable gate potentials, the nanoFETs’ Isp range is theoretically very large compared to other electric propulsion sys- tem such as ion thrusters or hall thrusters. Similarly, the thrust-to-power varies greatly, which offers the flexibility of using the same propulsion system for mul- tiple missions or to perform unplanned trajectory changes at a low propellant expense. These are theoretically achieved while maintaining a high internal efficiency that is usually above 85%. For the following CNTs: nanoFET par- ticle1 16nm diameter, 3 µm length; nanoFET particle2 4nm diameter, 3 µm length; nanoFET particle3 1nm diameter, 3 µm length, the expected Isp and Thrust-to-Power ratio is illustrated4,5 . Figure 6: Thrust-to-power ratio for large specific impulse range4 Figure 7: Internal efficiency for large specific impulse range4 Discussion Apart from the large specific impulse range at high internal efficiency that pro- vides great flexibility to design a multitude of mission phases based on just one propulsion system and to accommodate for unforeseen scenarios, the nanoFETs have other important advantages over other electric propulsion system, such as potential longer operational lifetime, their geometric scalability and the fact that the system is highly integrated. The longer operational lifetime is due to the fact that the CNT particles or any other conductive particles are charged electro- statically and not ionized which eliminates the need for cathodes and eliminates charge exchange collisions that are the main lifetime reduction factors5,6 . However, there are still a multitude of challenges ahead until a fully functional prototype will be achieved. First of all, the experiments done so far that demon- strated particle transportation, charging and lift-off were conducted using mi- crometer size particles such a s Aluminum, Titanium and Indium. Although theoretically the CNTs can greatly increase the performance, no nano-size par- ticles have been experimentally used so far. Experimenting at the nanoscale might sometime reveal new problems that were not present at the micron level. Also, it is generally desirable that a quantitative experimental analysis is done in order to understand how a multitude of particles with different character- istics perform. In this way it could be determined what particle shows the most promise, although CNTs have a strong theoretical advantage mainly due to their charge-to-mass ratio. Another important factor to investigate is how the charging process changes as the size of the particle decreases to the several nanometers; the main concerns being conductivity and the contact area with the electrode. Furthermore, an investigation should also be conducted regard- ing the transportation liquid. So far, it is uncertain if a fully dielectric liquid is always desired over a slightly conductive liquid. Moreover, different liquids should be tested in order to experimentally understand how the viscosity of the liquid influences the space charge current5,6,7,8 . Finally, from an academic point of view it would be desirable that both the theoretical and experimental papers are published in a peer-reviewed journal. Conclusion Overall, the nanoFET propulsion system shows great promise due to its high specific impulse range and inherent scalability. Although it is a new concept, the most important processes such as particle transportation and charging have been already demonstrated. However, there are still a multitude of experiments that need to be conducted in order to fully understand the behavior of the system under a wide range of factors. Another interesting prospect for the nanoFET technology is their possible use , not only in the space industry, but also in medicine. The nanoFET technology can also be used to accelerate particles and inject them through cellular walls to deliver drugs. For these reasons, the nanoFET technology is an exciting and potentially rewarding research subject. References 1. Gohardani O, Elola CM, Elizetxea C. Potential and prospective imple- mentation of carbon nanotubes on next generation aircraft and space vehicles: A review of current and expected applications in aerospace sciences. July 2014. Elsevier. Progress in Aerospace Sciences 70 (2014): 42-68, ISSN 0376-0421, http://dx.doi.org/10.1016/j.paerosci.2014.05.002. 2. Loiseau A, Launois P, Petit P, Roche S, Salvetat JP. Understanding Car- bon Nanotubes. 2006. Springer. ISBN-I3-978-3-540-26922-9. 3. Dresselhaus MS, Dresselhaus G, Avouris P. Carbon Nanotubes: Synthesis, Structure, Properties, and Applications. 2001. Springer. ISBN 3-540-41086-4. 4. Liu TM, Musinski LD, et al. Nanoparticle Electric Propulsion for Space Exploration. 2007. American Institute of Aeronautics and Astronautics. Re- trieved from: http://pepl.engin.umich.edu/pdf/STAIF2 007.pdf on1stof J une2015. 5. Liu TM, Musinski LD, et al. Nanoparticle Electric Propulsion: Experi- mental Results. 2007. American Institute of Aeronautics and Astronautics. Retrieved from: http://deepblue.lib.umich.edu/bitstream/handle/2027.42/76874/AIAA-2006-4803- 539.pdf ?sequence=1 on 1st of June 2015. 6. Liu TM, Musinski LD, et al. Theoretical Aspects of Nanoparticle Electric Propulsion. 2006. American Institute of Aeronautics and Astronautics.Retrieved from: http://pepl.engin.umich.edu/pdf/AIAA-2006-4335.pdf on on 1st of June 2015. 7. Liu TM, Musinski LD, et al. Developmental Progress of the Nanopar- ticle Field Extraction Thruster. 2008.American Institute of Aeronautics and Astronautics. Retrieved from: http://www.umich.edu/ peplweb/pdf/AIAA- 2008-5096.pdf on 1st of June 2015. 8. Liu TM, Musinski L, Gilchrist B, Gallimore A. Electrostatic charging of micro- and nano-particles for use with highly energetic applications. 2008. Elsevier. Journal of Electrostatics. doi:10.1016/j.elstat.2008.11.001

Free College Admissions Essays: Responding to Future Challenges :: College Admissions Essays

Responding to Future Challenges    As the world grows so do our challenges. Not only are our problems growing in number but they are also growing in complexity. There is scarcely a day that goes by when I don't hear about some new problem that will soon threaten us all. While some of these problems such as El Nino, earthquakes, and other natural disasters cannot be stopped -- there are other challenges such as the spread of racial hatred, rising risk of disease spread, and the growing levels of civil unrest throughout much of the world which threaten many lives everyday. Most of the future's challenges will only be made possible if all people, regardless of race, color, or nationality, attempt to work together for a stronger world. There are many ways in which I believe that I can help society meet this future challenge of coming together as a united world.    While I was an exchange student, I saw the world from a different point of view. For the first time, I realized that the people of the world have so many similarities in comparison to the few and insignificant differences. To make the people of the world unite would merely take time in convincing people of the world that we are all in pursuit of the same basic goals. All that it would take to show that this could be done is two different cultures to unite and then the rest of the world what can come by the strength all gain by coming together.    I believe that I can help in solving some of the barriers that hold us back from completing the task that we all desire which is unity. I served as a miniature version of a diplomat when I was an exchange student. I helped people in another country see that we all have common goals and I also helped sever the bonds to racial hatred by providing them insight into the American way of thinking and they did likewise for me. I have done everything to help sever these ancient bonds and will continue to do so in the future as I feel I am called to do.    Many suffer problems on a much less grandiose scale. Although these problems may not seem to be as big as world peace or global warming, they are however present.