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Computer science

Sat, 19 May 2012 21:09:34 +0000

In 1958, Chaim Pekeris completed a flagship project in computer science. As a physicist at the Weizmann Institute of Technology, Israel, fascinated with the relatively new science of quantum mechanics and its potential from the ground up to explain the behavior of atoms.

There was a problem, however. The equation of Schrödinger developed that could do the job was too complex for mere mortals to handle. His commitment to the electronic energy levels of even a modest to determine helium atom was seemingly impossible.

Chaim had an idea, however. why not take advantage of the emerging field of computer do the work

Today, Doron Zeilberger Christoph Koutschan and analyze the work done for several years and compare it with the approach would be to take over problem today. It makes an interesting read.

Chaim

task was monumental.

The first time I had to Wiezmann Institute and a technical committee with Einstein and von Neumann in order to convince build a computer. Einstein was very difficult to convince, but was eventually won by von Neumann.

WEIZAC, Israel’s first electronic computer was constructed between 1954 and 1954. According to Wikipedia WEIZAC asynchronously was a computer in the words of 40 bits. Consisted of 20-bit instructions: an instruction code of 8-bit and 12-bit addressing for. For a memory that could have been save a magnetic drum 1,024 words.

Today, we put more computing power a washing machine.

Before the computer was unable to attend, had Pekeris, one way to describe the two atoms and the nucleus of a helium atom with the type of periodic partial differential equations that could handle a computer to find. The result has been derived a remarkable 33-term equation, it requires one single calculation and estimation Koutschan Zeilberger it has 20 hours after the person.

The team that had to be programmed – into machine code. That is, in its entirety developer of 0 and 1, enlisted the help of the self-taught early named Yigal Acad write.

WEIZAC The program then went for months busy, finally produced a series of tables showing the energy levels of a helium atom, the first time, this would have been done accurately describe ..

So, how has this process

Moore’s Law are concerned, ask Koutschan and Zeilberger.

repetitive Pekeris project “with modern tools of information technology to see how they compare

You say that the numerical calculation -. Work WEIZAC -. In a split second in any notebook and Pavilion dv9000 (HP dv9000 battery) and Hp PB991A

can be completed, you also note that the programming is much easier, thanks to the many high-level language programming available now. Few people these days have to time with the machine Code of wasting, thank God.

Perhaps most surprisingly, the algebra of the development of differential equations can now be performed much faster with computer algebra programs like Mathematica and Maple.

Koutschan Zeilberger and say, they were able to implement this part of the project, the Pekeris took at least 20 hours in a 2-hour session to condense.

This is a fascinating and contradictory in many respects. While it is easy to many orders of magnitude of improvements that have improved the hardware to see, it is clear in this paper that the speed is limited by the software more

In particular, an order of magnitude -. is the time it takes to the algebra for this problem to do a surprisingly small improvement over a period of 50 years

-. from 20 hours to 2 hours

but given the nature of the problem is difficult to imagine how the magnitude of the improvements may be possible to What type of computer. may algebra software to program a person that does this kind of differential equations in minutes or seconds.

Of course, the limiting factor, not the software, but the “wetware”. This means that the next generation of improvements should focus on improving the wetware, or take it completely out of the loop.

Notebook Dualview

Fri, 18 May 2012 23:30:22 +0000

However, I have an old laptop with a screen would be in perfect condition to get lost in my basement. The laptop itself is the keyboard is almost uselessthe scaly, the mouse buttons do not work and the hard drive is just large enough to install Windows XP. I found a way to turn this laptop into a second external monitor, however, and requires no additional hardware.

As a laptop user, you probably know that you connect an external monitor to the video port on your laptop and change the display of the laptop LCD screen to the small external display greater . In this situation, we see the same image on the laptop LCD and external monitor. However, if you are running Windows XP Professional or Windows XP Home on his laptop computer and a graphics card and a compatible graphics card drivers installed recently, if you connect an external monitor to your laptop, you can create a multiserver environment monitors using DualView feature. Then you can extend your desktop across two monitors, so you can surf the Internet on one display while you take notes in Word on the other monitor.

The DualView feature activation
If you have a graphics card with dual view capabilities and an integrated video adapter driver that may affect the operation, Windows XP activation feature access Dualview is a breeze. For starters, you must turn off the laptop device and ensure that the external monitor is turned off. Then connect the monitor to the video port on your laptop.

If you have Windows XP up and running, turn on the external monitor. If your laptop is like most, you have a special key combination shortcut keys that allow you to switch between screens and the two monitors at once is possible. You need to change the settings so that only the laptop monitor is activated. If you do this, make sure the second monitor is set correctly.

then access the Properties dialog screen by clicking on the desktop and select the Properties command. Then select the Settings tab. If you do, the dialog box shown in Figure A similar

should To continue, select the second monitor icon on the map. When the Windows desktop is enabled on this monitor look Extend, select, as shown in Figure B. At this point, when you mouse over the graphics monitor, you will find the number 1 appears as the main screen and the number 2 is used as a secondary display with a series of numbers in brackets.

For example, with a screen resolution of 800 x 600, the coordinates would be (800.0). This set of coordinates showing the position of the icon starts the second monitor. You can click and drag an icon on the monitor in any position. When you are finished, click Apply. Once you do that, your second monitor back to life.

Depending on how the monitor icons, you might want to make sure that represent actual physical monitors correct positions. In order to investigate, click on the button to identify the bottom of the dialog box. Then you will see appear in large numbers to monitor each symbol on the monitor that corresponds to each symbol is displayed. complete

DualView the configuration, click OK to close the dialog box to close the Display Properties. You can then use the two monitors to distribute their work.

Cell towers, NIMBY?

Thu, 17 May 2012 03:09:18 +0000

current economic recession in 2009, companies know actively in the development of cell towers that real estate is down and the owners with financial problems may be willing to sign a contract quickly. The NIMBY (not in my back yard) people who are to have built against mobile phone masts and is willing to monopoly on his property, in many cases.

But let the buyer beware, or rather, in this case that the landlord be careful. Carriers have a way to get into the language in their leases cell towers to sneak a direct impact on the profitability of your site cell.

Here are some basic tips on what to do when it comes to wireless service providers:

? When looking for a mobile operator to a tower to make sure that you consult a professional of the wireless industry to build closer. Also, a good real estate attorney might be missing something in the agreement.

Small changes in wording can affect the protection against tax assessments, the rights of the rental, and rental fees.

? If your tower of the company or the company is trying to negotiate with you again to stop because your cell phone tower lease after 15 or 20 years, will usually want to get you to sign quickly. Do not move. Chances are, if you have subscribed to a cell tower in the 1990s, it is language which seriously reduces your profit potential on the website and you are ready to have settled in cash, but a peer-reviewed and industry and negotiating the terms of the lease cell site.

? In addition, there are a variety of parasites wireless work on commission and try to force the owners of thousands of dollars per year on their lease mobile phones, giving them confusing and often incorrect information. If you have not been contacted by a company cell tower rent reduction, do not say to stop harassing you. The mention of the FCC or the local office of the Attorney General and will darken in the cell tower location next to the phone and probably never move their door again.

Perhaps the funniest thing is the cell phone tower NIMBY crowd, that most of them have cell phones or blackberries, sometimes ring during the hearings of the board of zoning. Property owners, it is essential that before entering into any lease with a company that provides mobile phone towers to read the fine print of the lease.

Notebook Dualview

Wed, 16 May 2012 05:51:49 +0000

However, I

have an old laptop with a screen would be in perfect condition to get lost in my basement. The laptop itself is almost useless, the keyboard is not perfect, will not operate the mouse buttons and the hard drive is just large enough to install Windows XP. I found a way, this laptop into a second external monitor turn, however, and requires no additional hardware.

As a laptop user, you probably know that you connect an external monitor to the video port on your laptop and change the LCD screen of the laptop small external screen is larger. In this situation, we see the same image on the notebook LCD and external monitor. However, if you are running Windows XP Professional or Windows XP on your laptop and a supported graphics card and a recently installed video drivers if you connect an external monitor to your laptop, you can configure a multi-monitor with the DualView feature.

You can then extend the desktop across two screens, so you can surf the Internet on one display while you take notes in Word on the other monitor.

The DualView feature activation
If you have a graphics card with dual view capabilities and an integrated video adapter driver that can access the function, activation function of Windows XP Dualview is a breeze . For starters, you must turn off the laptop device and ensure that the external monitor is turned off. Then connect the monitor to the video port on your laptop.

then access the Properties dialog screen by clicking on the desktop and select the Properties command. Then select the Settings tab. If you do, the dialog box shown in Figure A similar

should To continue, select the second monitor icon on the map. When the Windows desktop onto this monitor is enabled to see Extend, select, as shown in Figure B. At this point, if you mouse over the graphic display, you can see that the number 1 as the main screen and The number 2 is displayed as the secondary display with a series of numbers in parentheses.

Depending on how the monitor icons, you may want to ensure that correctly represent the physical positions on the monitor. In order to investigate, click on the button to identify the bottom of the dialog box. You will see a large number on each monitor icon, the monitor corresponding to each symbol shows appear. complete

DualView the configuration, click OK to close the dialog box to close the Display Properties. You can then use the two monitors to distribute their work.

Computer driver

Tue, 15 May 2012 07:14:32 +0000

This is what all hardware and accessories are bought, which are stored with the drivers on a floppy disk or CD

If your hardware seems to work poorly or stand in front of a hardware failure, hardware conflicts and crashes the perfect system, you may need to get the updated drivers to fix bugs and add functionality to to improve device. “Text-align: Where to get the driver

1 Click the right mouse button on My Computer and click Manage /> Device Removal dialog box, click OK bestätigen, Stift, /> update drivers for older devices. ” . br /> 1 Open the Windows Device Manager in the Device Manager to find the device you want to update the drivers /> In Eigenschaften-Fenster, 5 In the Hardware Update Wizard point Windows to the location of the updated drivers on the hard disk,.
6 Once the drivers have been installed to start, new

Problems with Acer notebooks

Mon, 14 May 2012 09:17:43 +0000

All laptops

all large and small companies have different problems, or acquire them over time. Such problems can be software or hardware on it, the technical problems caused installed. Most problems are caused by laptop users, since not many people treat their laptops and throws a good punch, or they start to appear and finally the problems. But if you have a warranty available for any problems that are not caused by your laptop, important because they can be repaired without charge. Acer is a company with good quality laptops built, but as is inevitable, laptop computers with different hardware or software problems that may come directly from the assembly line. We present the problems of notebooks from Acer.

say

Most users say they have big problems with the battery and power cord because the battery Acer Aspire 1680, Acer Aspire 2200 Battery battery and Acer BATBL50L6.

Most Acer notebook users, these two problems and I can see that it shares with other brands. When you turn on your laptop, the battery is full, but turn out to be empty and must collect and here comes the second problem with the power cord. Most users complained that the power cable and although it works on the laptop plugged in and connected, the laptop is still collecting habit.

we put the Acer laptop problems we face on the power button to talk, sometimes to the different users are in trouble to repair it. In my opinion it does not last very long big problems to fix, but they are disturbing, because sending laptop in the service that you spend much time trying to work without a device, and you could take advantage of many of . lose

Another problem is even more worrying is the screen. On some laptops, the screen or blue-black in the middle of the workplace or in the middle of a game. But do not worry, because there are manuals online or forums many sites that teaches you how to tackle these problems and solve them, are on their own without the help of special services. I ended up talking about the problems of notebooks from Acer, and I concluded that this type of laptops are doing well and no major problems due to their being, can be and have it in service to transmit for a long period of time. Most problems are common and can be adjusted by home users.

Especially if you buy a laptop, need to see a market study, which brand is best to do what works best is to your laptop specifications and which hardware problems and software after buying the laptop You want to hear.

Recycling your mobile phone

Sun, 13 May 2012 11:04:52 +0000

always difficult to give a cell phone when it comes to simply not correct. Especially if the phone has some sentimental value for you. Perhaps it was his first cell phone? Some companies do their best to repair its technology by information professionals. If and when the professional says it’s the right time to bring a new device, the knowledge of the country to consider the recycling of this piece of technology is maintained.

Recycling is a new concept with aspects of the mobile phone and has become very popular with environmental awareness. Until last year there were over 110 million mobile phones were wrongly rejected in the United States. Aggressive chemicals can affect the surface of the land only after months.

always in the best interest of mobile phone users to fully clean the data and your personal information before donating, or sold to third parties. The manual for the mobile phone is capable of containing instructions to perform this operation safely.

Prior to permanently remove sensitive information, always make sure your new provider, the data can be copied to the new phone. This not only saves time, but the possibility of human error in the transmission of data.

Given the iPhone’s or Blackberry repair repair an option, although a large number of persons on board one of their phones for cash (which are recycled), formal or sell recycling of the phones themselves

There are a variety of ways to recycle a cell phone when a person tries to get rid of it. Update the event that the suppliers have changed, or is the option of a different variety of mobile phones, mobile phone can be recycled.

The donation to the soldiers: There are several companies online and offline now send mobile phones abroad, for our troops active. In case you would lose your phone, or you need a temporary contact with their families back home, this is a fantastic choice.

Give a relative or friend: After deleting all data from a cell phone is often the case that a family member or friend can be a phone with the same provider used. In some cases there may be a fee to use the phone with a different name, but someone in your area you can buy from the necessity of a new mobile phone store.

sale on the spot: There are often people who get a cell phone for less than cost, and start-up packages of mobile phones can be very expensive. Ask a complement to the phone and all accessories that includes, in his:. Local newspaper, online or through word of mouth

recycled products made for the good of the country and the people living there are available. The recycling of mobile phones, there are many ways to keep it off the ground, and possibly by another person. At some point Green Living is a simple step and progressive start.

Hewlett-Packard Notebooks

Sat, 12 May 2012 13:24:44 +0000

Hewlett-Packard (NYSE), also known as HP, is an IT company in Palo Alto, California, USA. The company is specialized in the production of PCs, laptops, servers, printers, software, products, etc. In 2006, the company generated revenues of $ 91.7 billion, compared with 91.4 billion to IBM, HP, this means that the world largest providers of technology. In 2007, sales were $ 104 million, which means that HP is the first company in history does a turnover of over $ 100 million. HP is the world’s largest supplier of personal computers, surpassing rival Dell, according to market research firms Gartner and IDC reported in January 2008, has the gap between HP and Dell expanded significantly in late 2007, HP will, at 3.9% found in the equity markets. HP is also the place in the 5 largest global companies, the software takes.

The HP Compaq Mini 311 This test with a Atom N270 (1.6GHz), 1GB of DDR3 1066 MHz, RAM, hard drive 160 GB SATA 5400 rpm, a rate set Nvidia graphics chip John le 319 MB, 11, 6” WXGA High Definition BrightView LED-backlit display with a resolution of 1366 x 768, a webcam with microphone, Card Reader 5 in 1, 2 speakers Altec-Lansing and interfaces Wi-Fi b / g, Bluetooth, HDMI, VGA, headphone and microphone, Ethernet and USB 2.0 (3x).

is the care was 1.46 kg with 6 cell battery, such as battery HP Pavilion dv1000, HP Pavilion ze2000 Battery, Compaq Presario M2000 Battery and 4910 mAh Family Runs on Windows

SP3.Hijo XP theme is very close to the 1000 Mini.

However, it is less compact than the past. The quality of design and perfect finish pleasing to the eye. The screen is prone to glare because of its bright colors and treatment appear only pâlichonnes. The viewing angles are vertical and horizontal average, larger.

The speaker is good for a 11-inch model with a high volume, but rather the lack of bass. Notable connectivity Eastern classics with the presence of an HDMI output. The keyboard is large and some buttons that are least used are smaller than normal. You will see people who are accustomed to classical models instead of Chiclets. Work in all cases correctly.

The ALPS touchpad multi-touch is precise and sensitive to the glossy surface, but not everyone should be in the church more or less comfortable. Its keys are functional and loud. It provides power for everyday office use correct type, internet, video playback and photo retouching SD nudge. His score of 2096 points in PCMark05.

In practice, even with GPU acceleration in Flash award, reading the high-definition video processor little Velocità pati. In Hulu, reading taken from the HD video and audio is deca. It also shows weaknesses in multitasking, where the system is very slow.

higher in 3DMark06, the score of 1385 points than the average netbook. But in practice, such as Counter Strike: Source can not play as great success with an average of 12-15 fps in detail, while the low World of Warcraft works. The ION graphics is actually a part of the terminals of the Atom processor. The content is hot. It’s a little bit, but not particularly entender Bruyere. Finally, with 6:18 empower bright active Wi-Fi and 70% is good.

Cell Phone Spy Software

Fri, 11 May 2012 15:14:10 +0000

. . a cell phone for a child can be life saving, and even children at the age of four or five years can be

Some companies using a simple mobile phones do for small children – that look like toys, but It is up to parents to instill in the child is not a toy, and show how to use it properly. important numbers, including 911 can be preprogrammed.

Small children do not obviously need a cell phone to . want to talk with friends, but a little older you get that for you, so that a pre-paid mobile phone is the right way

Some cell phone plans are very affordable for kids -. Less than 10 U.S. dollars per month and include access to a need to do the GPS Locator Phone

Every parent is pre-programmed to the phone to send an e-mail at certain times of the day. The father then to your computer or cell phone to “see” in fact, where the phone. Very useful if your phone is misplaced, but even more useful if the child is late coming home or not.

parental controls be added as the child grows to be. Again, all parents have to do is pick up the phone logs on a computer. can use a phone to be monitored online and e-mails, texts and web pages visited can see the child. Each risk behavior can immediately by blocking certain websites, e-mail addresses or numbers are canceled.

Many children who are reported missing just walked away with his friends, but can still suppose to be the moment when parents and can be a lot of resources for law enforcement use. Almost half the children who are lost in the time it was discovered that members of the family, an estranged father or mother, she has taken. For $ 10 a month, if a child want a phone that many of these cases could be solved much more quickly bears.

Of course, as the child grows, you become a more sophisticated phone, but does not mean it will be less at risk. Recycle your old phone properly or pass it to another parent of a child, but if you buy cell phone next to your child, let the GPS tracking program on it.