Every year, before schools and college institutions begin their classes, students from around the country visit department stores and major electronics chains in an effort to get all those necessities that will allow them to complete successfully their studies. So, if you have recently been accepted to college and you are not exactly sure which your computing needs will be, buying a notebook computer is not a luxury purchase, but actually a necessity. In fact, anyone who has to cover frequent travel concerns, from college students to frequent business travelers, should possess a laptop, given the fact that it provides a mobile and light-weight computing experience for computer users around the world.Recent research indicates that laptops are in fact used extensively as people need to own computer systems that are as mobile as they are. Buying an effective machine that can also be easy to carry around has increased considerably the laptop sales over the last decade, considering the lower manufacturer and assembly costs. Deals between hardware developers and software engineers have resulted in improved notebook systems that incorporate the ability of them being transferred easily from one place to another, as well as being able to compute much more than the main software functions, like reading and composing emails, operating spreadsheets, or using word processing applications. In fact, whether one needs to take work from one office location to another or do some work while onboard, today's laptops can accomplish almost any task.But if you are still contemplating on whether or not you actually do need a laptop to perform your computer-related college work, it is useful to consider the vast capabilities of these travel-ready devices as well as your current needs and ability to operate them. Owning a highly portable workstation can provide you with entertainment, productivity and ease of use. Forget about long messy cords and mouse pads. Easy to navigate by just using your fingers, today's laptop models need no more than their rechargeable batteries or just an outlet to connect to their AC adapter and you are good to go.Listening to music, playing games, watching videos, or writing a paper has never been easier. Laptop computers allow college students to manage their daily busy schedules instead of loosing time and effort. Some models offer screens that are only visible to the person that seats directly across them, eliminating the chances of one being able to visibly access your files and folders. Headphones and microphones, as used with desktop publishers are used to provide an efficient but considerate experience. Keep in mind that most of the available models come with software applications already in place making Internet browsing or working on a project a simple and easy process of starting up the machine. Finally, since laptop computers have become a mainstream device, many affordable models are offered in electronic superstores or are available to be ordered directly from the laptops manufacturers' websites.
A fuel cell is an electro chemical energy conversion device, which produces electricity from external supplies of fuel (on the anode side) and oxidant (on the cathode side). These react in the presence of an electrolyte to produce energy.Since a typical fuel cell produces less than one volt, in practical application cells are 'stacked' in parallel to create a useful voltage. Thus a typical fuel cell is made up of many thin sheets, usually of stainless steel, which must be welded together to form the fuel cell stack.Welding of the plates is by far the most time consuming process involved in the manufacture of fuel cells - there is about one meter of welding required for every single plate in every single fuel cell stack - that is about 400m of welding for each eco-car. Optimising the welding process offers the opportunity to make significant savings in the cost of production of fuel cells. The issues here are all related to the difficulty of achieving a small, clean, reliable weld at viable production speeds using traditional laser welding techniques. To solve these problems, the leading-edge manufacturers are now looking to fibre laser welding technology.The key advantages of "fibre laser" s over other laser technologies are its high beam quality, energy & power stability, giving higher power density and a greater breadth of control, as well as its low total cost of ownership. The high beam quality of the fibre laser enables the beam to be focused to a small spot with a correspondingly high energy density. This enables very fast and efficient processing, yielding welds with a high aspect ratio. Compared with other laser sources, the fibre laser can produce welds with significantly lower heat input resulting in less distortion of the welded plates. The high energy stability, typically +/-0.5%, gives welds of consistent profile and penetration with extremely low levels of weld root porosity. It is recognised that other laser technologies are capable of making such welds, but the fibre laser offers a solution that welds faster with higher quality at a lower operational running cost. "We believe that the cost-performance capability of a standard 200W fibre laser will act as an enabling technology in the battle to drive down production costs of tomorrows fuel cells" said John Tinson.The fuel cell plate requires a high aspect ratio weld (typically 3:1 or 4:1) in order minimise heat input to the plate and keep distortion to an acceptable level. The beauty of the fibre laser is that it readily achieves this with spot sizes of less than 200 m. As a result, distortion of the plates, a potentially cumulative problem when the plates are stacked, can be minimised.Metallographic analysis of 'key-hole' and high aspect ratio welds often reveals problems with weld porosity, particularly in the root of the weld. In the fuel cell application the integrity of the weld is vitally important and a fully hermetic seal is a prime requirement. A poor quality weld could lead to serious performance problems over the life of the fuel cell, or even leakage of hydrogen or other fluids. Experience has shown that the fibre laser, with its exceptionally high power density at the work-piece, is particularly good producing consistently reliable, non-porous welds.Another problem noted by some manufacturers using YAG or CO2 lasers is the possibility of 'humping' of the weld, when the laser is operated at high production speeds. This is the phenomenon whereby the inherent fluid instability of the melt pool at high weld speed creates a 'hump'. It is seen as a problem by some manufacturers because it can limit production speed, but it is not a problem with a standard 200W fibre laser, even at speeds of up to five or six metres / minute it can produce over 2,500km of weld per annum.In a production environment fiber laserss have a reputation from extremely high up times and have no operational consumables, unlike other laser sources such as Nd:YAG lasers that require a periodic change of flash lamps or CO2 lasers which need supply of consumable gases. Additionally the high electrical efficiency of "fiber lasers" s - up to ten times more efficient in power consumption than Nd:YAG equivalents mean that they offer significantly lower running costs. They can be used for welding 'on demand' unlike some other types of lasers with no need for warm-up, further reducing energy consumption and run through scrap. As fiber laserss are sealed units with no lamps that need changing or mirrors to realign, they have a very low maintenance overhead, yielding savings of thousands of per annum per laser. Fibre lasers offer fuel cell manufacturers an attractive "green manufacturing" technology, providing high productivity / high integrity welding with low operating costs for this critical application.Results from leading manufacturers in this field show that fiber lasers welding will play a significant role in tipping the balance for fuel cell technology from a 'promising idea' to a serious commercial solution to the world's energy-usage problems.
It's astonishing to me at how quickly the world has changed.When I was growing up -- and it wasn't that long ago -- if I wanted to have any sort of gambling excitement, I'd have to go and take a trip to either Las Vegas or Atlantic City. (Okay, there was also a weekly poker game in my Uncle Frank's basement but I didn't like to go there because he always cheated.)Now, part of what I loved about going to an actual casino was that they had the one game there that I actually did fairly well at -- roulette.Unfortunately, there just weren't many places where I could actually play roulette. It's one thing to invite some friends over for a friendly game of poker but it's something else to pick up the phone and go, "Hey, guys, how about coming over and playing roulette at my place?"You'd be surprised at how many people don't really want to take you up on an offer like that.Now, don't get me wrong -- I love poker and blackjack and even playing the slot machines. But for me, roulette was always something that I managed to do a decent job at winning. Granted, I didn't win big -- but I sure did better than when I sat down to play poker. (I'm not going to mention the time that I lost my Fiat Spyder to a full house.)One day, I was mentioning this situation to a buddy of mine and he said,"Why dont you try playing online roulette?"Now, I'm not exactly the most computer literate guy in the world -- and the thought of actually playing an online roulette game seemed a little weird to me. For one thing, I was afraid that I'd wind up with a crooked casino or something and the next thing I'd know, there'd be a couple of guys at the front door who wanted to repossess my house."It's not like that," he said. "There are places that are totally legit -- and where you can actually make some pretty good money."And that's when he told me about a site that explained all about online roulette and which also provided an eBook at no charge to the people who visited the webpage. Naturally, that set off alarms in my head. I'm one of those guys who has learned that there's no such thing as a free lunch -- and some of the things out there that are "free" have cost me more than I'd like to recall.But there's something that I learned a long time ago from my father. Whenever an opportunity would come along, he'd always check it out. He might not have bought into it but he always went to see what it was about. I asked him why he would do that and he said, "I'd hate to think that I'd let the chance of a lifetime slip by just because I was too lazy to look into it."So I went to the website and to my surprise, it was on the level. I checked it out and there was information that was useful to the beginning player (as well as the advanced player) and I didn't even get the slightest whiff of something being amiss.But does anyone really play those online roulette games?The answer is a resounding YES! In doing my research, I found out that some of the online sites have a steady stream of customers -- and some of them are constantly paying out to players in the know.In fact, the website that I went to had an offer for an eBook -- and they didn't want anyone to pay until they had tried the book out. Right there, I tried to figure out what the catch was -- and I found out there wasn't a catch. It was one of those places that was just convinced that they had a useful product and that people would pay money once they saw that it worked.The site I'm talking about is http://www.RouletteMadeEasy.com.So, after checking out some of the websites and after looking through the book, I decided that I'd go ahead and give it a whirl -- and to my amazement, I actually started to make money. At first, it was only a little bit but before I knew it, I was actually making some real money.The amazing thing is that when I showed my friends the system and they tried it, they discovered that I wasn't exaggerating about the amount of money that they could make. In fact, one of my buddies from the auto repair shop has earned enough money from online roulette to actually pay off his house.Is everyone going to make that kind of money? Probably not -- but one thing that I've learned is that by playing sensibly and by using some of the systems that are available online, just about anyone can walk away from the table a winner.I don't know about you but I sure like those odds.
The demands of kids are getting more and more difficult to keep up with. Once upon a time the biggest thing on a twelve year-olds wish list was a new bicycle. Now kids want cell phones at younger and younger ages. How old is old enough to purchase the ever desired cell phone? How young is too young?Cell phone shopping for younger children can be very difficult. Depending on the age of the child it is possible they have not developed enough self restraint to handle a cell phone. School work may suffer as may other social relationships.Cell phones now come with internet access, which can present dangers unknown to your child. Easily downloadable information may not be age appropriate. Cell phones also offer children private communication abilities through text messaging.It is not necessary to activate all of the possible features that come with a cell phone, but understanding your own childs limitations can help you know what is truly appropriate for them at their age. Private texting can lead to highly inappropriate conversations. Unlike instant messaging or phone conversations, texts can be deleted permanently and a parent has no recourse to determine whether a child is having innocent conversations with their friends or are being enticed into dangerous and self destructive behaviors.They now have "cell phones" more appropriately geared toward young children. These phones come with a parental control feature that allow access to preset phone numbers such as reaching mom at work, 911 access, and several preset phone numbers of the parents choice, The cell phone requires a pass code to access any changes to the phones capabilities to prevent the child from listing their own phone numbers in their cell phone.The appropriate age for taking a child cell phone shopping is truly up to the parent. If a parent thinks that a cell phone has beneficial uses for their child and can handle the limitations imposed as well as basic honesty, then cell phones can be excellent lessons in responsibility. Cell phones can help teach self imposed limitations as well as enhance parental communications. A parent can reach their child at all times to inform them of changes or request their presence at home.Cell phones can be vital in an emergency. While nobody ever expects an emergency to occur, in the event of one your child and you can remain in communication if they have a cell phone. Sometimes it can be the safest form of communication in an emergency situation. Children who have cell phones can almost always reach their parent.
If your computer broke tomorrow and it was beyond repair, what would you do with it? Well chances are that after slamming it against the wall in a fit of rage, youre going to throw it in the trashcan in your garage. Alongside all the other non-recyclable trash your household created this week, the trash men will come pick it up, condense it in their truck, and dump it into a huge pile of waste. The huge pile of waste will be compacted even more, and then sent out to some island where all the huge piles of your garbage go. Sounds simple, right?Sure, its simple enough; until a bird lands on your crunched piece of laptop and dies from exposure to the acid that leaked out of the battery. Gasp! Alright, you say to yourself, Ill take the battery out and burn it in my backyard instead of throwing it in the trash. Well unless youd like an explosion in your backyard, then no, you should NOT burn any old battery solely because you know is it wrong to throw it in the trash.So what exactly do you do with this battery? How about all the other parts of the computer that still function? After you consider all of the minute details that go into making a computer work, and you realize that your computer might be broken beyond repair but that the tiny pieces could function perfectly in someone elses computer, it seems like a big waste to be disposing of the entire thing with one careless toss into the garbage. Not only would you be polluting the environment, adding to the amount of waste your family creates, and putting innocent animals at danger with the improper disposal of your computer, but you would also be wasting hundreds of dollars worth of useful items in a computer that can probably be refurbished anyways.Aside from the battery leaking acid in a waste heap, other environmental concerns are with toner or ink from printers, glass pieces from tiny light bulbs, and other wires and metal pieces tangled inside every computer. Luckily, there are companies that deal with computer disposal or refurbishing to make your job a lot easier. If you feel the need to bash your computer against the wall in a fit of rage, simply wrap it up and send it to a "computer disposal" company who will, oftentimes for free, properly dispose of your computer. If your computer stops working or you simply care to invest in an updated version, then there are companies who you can send it to who will pay you for the parts that are still useable and will refurbish the computer so they can re-sell it or donate it to a low-income family or agency once it works again.One might think, Well, I know of a charity that could really use my old computer. I will donate it on my own. Not so fast, buddy. Donating an older computer to an organization that you think could really use it doesnt always work out so well. In many instances, the computer will cease to work after a couple of months, and the organization might have to spend more money to repair it. It is poor etiquette to donate something when you are not quite sure of its value. If youd rather not give cash, some businesses will take your old computer and send the cash value of its remaining parts to an organization of your choice.The bottom line is that there are many different things you can and should do with a computer that you no longer want as your own. For the same reasons that you taught your children how to recycle, that you turn off the lights when you leave a room, and because you try to take only as much food as you are prepared to eat at a buffet table, you should dispose of or recycle your PC properly.