Contents

  • A Guide To Mri Scans
  • 7 Great Computer User Tips - For Windows Users Only
  • How To Choose Voice Recognition Software?
  • An Easy Way to Build a Home Network
  • Summary
  • The DC Power Supply is a rather fundamental electronic device, however there are hundreds of DC Power Supply products on the market from dozen of manufacturers. Narrowing down the best product for your application and budget can be a daunting task. This article addresses DC Power Supply differentiators, functions and the applications they are best suited for. The articles focus is DC Power Supplies used by engineers, manufacturers, quality professionals and electronic hobbyi...

    Choosing The Right DC Power Supply For Your Application

    Choosing The Right DC Power Supply For Your ApplicationThe DC Power Supply is a rather fundamental electronic device, however there are hundreds of "DC Power Supply" products on the market from dozen of manufacturers. Narrowing down the best product for your application and budget can be a daunting task. This article addresses DC Power Supply differentiators, functions and the applications they are best suited for. The articles focus is DC Power Supplies used by engineers, manufacturers, quality professionals and electronic hobbyists for the purposes of R&D, manufacturing and testing.Power Supplies can range in price from $50 to $20,000 and the cost is often directly proportional to the amount of power the device outputs. The primary function of a power supply is to regulate output voltage and current. It takes an input power and regulates the output power as to enforce a constant voltage and current. In the case of "DC Power Supplies" , the input power is converted from alternating current (AC) to direct current (DC). There are two basic types of regulated DC Power Supplies: Linear and Switching.Linear power supplies can never output a higher voltage than the input source. In theory, a linear power supply that is driven by typical 110V wall outlet could only output 110V, assuming the device were 100% efficient. Realistically, no power supply is 100% efficient because power conversion always results in energy loss, usually in the form of heat dissipation. Therefore, linear power supplies usually output voltage that is significantly less than the input.Switching power supplies can step-up, step-down or invert the input voltage. Switching power supplies are usually larger, noisier and more expensive than their linear counterparts, however, switching power supplies are typically more efficient.Choosing the right DC power supply for your application requires definition of some basic design specifications: voltage range, current range, number of outputs, power cleanliness (known as ripple) and programmability. In general, the higher the output voltage and the lower the ripple, the more expensive the DC Power Supply. Multiple outputs and programmability features will also add to the cost.The least expensive DC Power Supplies are ideal for electronics hobbyists and basic electro-mechanical applications where only raw power is required. It is likely that the devices being powered in these applications already have power-conditioning features that eliminate the need for precision input power. Low power, single output, DC power supplies range in price from $50 to $200.Mid-range power supplies are best suited for non-critical, laboratory projects involving more advanced electro-mechanical applications or basic board-level testing. Mid-range power supplies might have multiple outputs, higher power ratings, lower ripple and precision, digital metering (+/- .001V, +/- .01A). Mid-range DC power supplies can be linear or switching and could range in price from $200 to $1,000.High-end applications requiring high output voltage, advanced programmability (GPIB PC Interfaces), numerous outputs and very low ripple should budget in excess of $1,000 for their DC power supply. Many laboratory, R&D and testing applications could easily spend $5,000 to $10,000 per power supply.This article has introduced some basic features and applications of DC Power Supplies. Before making your final purchase, be sure to consult the manufacturer and thoroughly understand all the specifications of a particular product. Choosing the best and most economical DC Power Supply for your application does not have to be a complex and time-consuming task. By identifying your design parameters, you will quickly narrow down product selection to niche class of products from only a few manufacturers.

    Virtual IT: Grow your business by providing ongoing service

    Virtual IT: Grow your business by providing ongoing service

    Virtual IT: How It Can Benefit Your BusinessMost successful small business computer consultants position their companies as virtual IT departments? Why? Because providing virtual IT to your customers gives you steady business. In this article, you'll learn why providing virtual IT to your clients can benefit both you and your customers.What is "Virtual IT" ?Virtual IT is really all about becoming your clients' outsourced IT department. So instead of just selling your customers and clients PCs, servers, routers, Wi-Fi, cabling, and other physical products, you instead spend your time selecting and designing their networks, looking at business problems, figuring out how to apply the technology to business problems, and bringing all the resources together. With virtual IT, your firm acts as your clients' part-time IT managers or virtual CIO's. Virtual IT is a convenient, flexible, and comprehensive technical services program that gives small businesses access to what they need, when they need it-without the overhead burden of full-time, salaried IT staff.How can you provide virtual IT to your clients? For you to deliver virtual IT successfully and profitably, you need to know what the opportunities and the typical solutions look like. For example:What are the traditional types of services that you can sell to your existing clients and your future clients? What other opportunities exist? Virtual IT grows your relationships. Continue adding value to both your existing customers and clients, and new customers and clients. That's what it's really all about. It's not about just selling the initial network installation, getting it installed, walking out of there, and keeping your fingers crossed that everything works. Don't sit around waiting for your customers to call you. Be proactive: provide virtual IT on an ongoing basis and you and your clients will avoid most major emergencies. By providing virtual IT, your business will be more profitable and both you and your customers will experience fewer headaches. The Bottom Line about Virtual ITIn this article, you've been introduced to virtual IT. To learn more about virtual IT, click here now to get access to a free one-hour audio training program on 5 Easy Ways to Grow Your Computer Consulting Business. Copyright MMI-MMVI, Computer Consultants Secrets. All Worldwide Rights Reserved. {Attention Publishers: Live hyperlink in author resource box required for copyright compliance}

    A Guide To Mri Scans

    A Guide To Mri Scans

    As soon as Computerized Tomography or CT scans became accessible in the 1970s, they reformed the practice of neurology. They did the scans by transmitting x-ray streams all the way through the head at different positions and accumulating the x-ray streams on the other side that was not absorbed by the head. A sequence of images come into view on a computer monitor or on an x-ray plate as if the head had been sliced from side to side by a huge salami cutter and the slices were arranged out horizontally and in series.After that, in the 1980s Magnetic Resonance Imaging or MRI scans came into the picture and astounded the medical society by not just taking an image of the brain itself, but by doing so in a new way. MRIs concentrate on water molecules, as an alternative to imaging the degree to which the various parts of the head absorb x-rays. To be more specific, MRIs represent the speed at which rotating hydrogen atoms of water molecules inside various parts of the brain either line up or fall out of arrangement with a powerful magnetic field. These different values of de-magnetization or magnetization are inputted into a pc. Slice like images are formed in a sequence and put on view on a computer screen or x-ray type film in hues of gray. Irregular compositions, like brain tumors or the signs of multiple sclerosis, are shown in their own hues of gray and are also identifiable by their contours and positions. More on this at http://www.medicalimagingdevices.info. Getting hold of a different set of images after a hypodermal injection of gadolinium, which is the MRI equivalent of x-ray dye, also adds to analytical information.For a patient, the incident of having a CT and of having an MRI very much looks a lot like each other. In both situations the patient lies flat on a plane table that moves into and out of a hole in the scanner that looks a lot like an oversize doughnut hole. In the MRI machine the doughnut hole is narrower, so patients suffering from claustrophobia have to notify their doctors if this might be a hitch. Noise is also an issue with the MRI machine. A loud noise is produced every time the radio frequency coils are turned off and on. For either of these two scans the technologist may need to inject a needle in the patient's vein to dispense a distinct substance.A situation in which MRIs are basically not done is when the patient has a heart pacemaker. This is for the reason that the MRI machine's magnet might disturb the pacemaker and stop the heart. No image is so essential and important that this peril would be worth taking. Another situation in which an MRI is evaded is when the patient is gravely ill. A serious patient can be effectively examined and sustained while getting a CT scan, but not while getting an MRI.

    7 Great Computer User Tips - For Windows Users Only

    7 Great Computer User Tips - For Windows Users Only

    An Easy Performance EnhancementIf youre using the NTFS filing protocol on your system, instead of FAT32, you can get a bit more speed by disabling Windows Indexing. The downside to this is that searching your drive for a specific file might take a moment or two longer, but everything else should run faster.To disable this feature open My Computer and then right click on the drive you wish to reset usually C-drive. Now click on Properties and then uncheck Allow Indexing Service. It will take Windows a few moments to accomplish this task, based on your processor speed. If you have other hard drives, perform the same process for them. After this is done, its a good idea to empty the Recycle Bin and then Defragment your hard drive(s).FREE SoftwareIf you have a system and it does not have an office suite, such as Microsoft Office, and you dont want to pay several hundred dollars to have one, try Open Office. This is a great alternative to other suites, and its free! Simply direct your browser to www.openoffice.org and follow the instructions for downloading and installation. Make no mistake, this free office suite is an extremely powerful set of software tools easily a match for any competitor.Internet Explorer (Microsofts Internet browser) is unarguably the standard in computers. This is why hackers develop so many malware applications to invade it. If you use a different browser, you have much less chance of an invasion by malicious software. There is a great alternative available, and its free. You can download a copy of Firefox at www.mozilla.org/products/firefox. You can even move your Internet Explorer settings into Firefox automatically so you dont lose your Favorites, etc.Laptop Printer FixIf youre using a laptop that is running Windows ME, and youre having trouble printing through the USB, try this simple fix. Go to the website for the company that manufactures your printer. If you use a Hewlett-Packard, for example, go to www.HP.com and download the appropriate drivers and install them. ME has drivers that recognize the USB printer is present and attached, but not the drivers needed to make it print. Which drivers you download and install will be dependant on your printer. After installing new drivers, update the printer as necessary in the Control Panel.Save $$$ When Shopping On-lineIf youre making a purchase on-line, and you know the item you want to buy, you can easily compare pricing all across the Internet. This can amount to a very substantial savings.At this writing, I went to www.mysimon.com and typed in that I wanted to buy a printer: a Canon PIXMA iP4000. The service instantly checked the Internet and returned prices ranging from $62.00 up to $286.00. This kind of price spread is not at all unusual, especially for computers and electronics.The My Simon website service only checks pricing, it does not provide a platform for purchasing anything, though it does link to such places. It also gives a rating for the sellers and other users input regarding their experiences with the company. You can order the results of the search for your product by price, so that you can quickly find the lowest price from the highest rated dealer.Windows XP Professional OnlyA feature of Windows XP Professional, that is not available in the Home Edition, is the ability to encrypt files. This encryption prevents others from opening the files in the folder you encrypt. To encrypt one or more a folders, follow these easy steps.Click Start, then My Documents. Now locate the folder you wish to encrypt and right click on it and choose Properties.On the General tab, click on Advanced. Put a tick mark in the box for Encrypt Contents to Secure Data. Click okay two times and the confirmation dialog box will appear allowing you to select the folder, the folder and all files, and/or the subfolders within it.Now you'll be able to place files in this folder (or folders) and since they're encrypted, others will not be able to access them.Internet SafetyYou should never reveal your username or password to anyone who e-mails you and asks for it. This information is frequently asked for by an Internet scheme called phishing.In a common phishing scam, you receive an e-mail that looks quite official. It usually appears to come from a bank or credit card company. A common title for these e-mails is We need to verify your account information. Another is Please logon to your account and verify your settings. If you do click where instructed, youll end up on a site that appears to be the real one. If you fill in the username and password for of your on-line banking account, you can expect serious problems within twenty-four hours.If you believe that a company or business that you do on-line business with really does require your information, then simply contact them. This way, you will know where you are sending your information, and what it will be used for.CD Burning Error FixBurning music, video, and data CDs has become quite popular over the past few years, and the evolution of the supporting technology has yielded hardware and software that is better than ever and very reasonably priced. CDs offer a great place to store substantial amounts of data in a small, easily retained format. They also give us new control over aspects of our entertainment.A relatively common error received during CD burning informs you that the CD cannot be burned, or that there was an error during burning. Of course, you could actually have a defective CD drive, but this is usually not the case.If you receive a message indicating that your CD cannot be burned, go to the website of your CD drive manufacturer. Look for the list of CD types (manufacturers/numbers) that are compatible with your device. Most often, youll find that your CDs are not listed. The two types that seem to have the least difficulty being burned are manufactured by Sony and TDK. These cost a bit more, but they burn very reliably.Along the same lines H-P has introduced a new CD burner. This new burner requires the use of special CD blanks, but after you burn your data into the CD, you can flip it over and close the drive again. Then you can use the laser to burn a title for the CD directly onto the CD itself. Its new technology, but perhaps it will catch on and well see newer, better such devices in the near future.

    How To Choose Voice Recognition Software?

    Voice recognition software allows the user to use their voice as an input device so they can dictate text directly into the computer as well as give the computer commands such as open, save or close. Current software has come a long way from the first voice recognition software that was available.The older software used discrete speech which meant distinct pauses had to occur between words. Current software uses continuous speech voice recognition and is capable of recognizing speech up to 160 wpm. It uses what is called a neutral net to learn to recognize voices. Accuracy has improved a great deal in the past few years.When shopping for "voice recognition software" be sure to have the answers to these questions:1. What operating system is the software compatible with?2. What amount of memory is required?3. What speed of processor is required?4. What type of learning curve does the software have?5. Will it work with existing word processing software?6. Does it come with a microphone?7. How fast is it?8. Will you need a USB microphone?9. Is it macro capable?There is quite a variety of Voice Recognition Software packages currently on the market. Here are just a few to check out.1. Conversa Messenger A desktop messaging system for small businesses that allows you to access your voicemail, e-mail, and faxes by voice. Its easy to use and has continuous speech recognition.2. Dragon Naturally Speaking Essentials For ages 9 and up; it provides an introduction to continuous speech recognition with a vocabulary of more than 250,000 terms and 160,000 active words.3. Dragon Naturally Speaking Professional Allows you to dictate up to 160 words per minute, launch applications, complete forms, and do other complex tasks. Dragon also has specialty programs such as Medical Suite and Legal Suite.4. Eloquently Started Designed for physicians for producing medical records. It comes complete with a sophisticated database and is designed for producing detailed medical reports quickly.5. Realize Voice Uses the Whisper speech recognition engine that requires no training, although you can train it to improve its vocabulary. It can open and close windows and carry out basic task functions.6. Interactive Voice Assistant IVA This assistant will not only let you talk to it, it will talk to you; and you can tell your assistant what to do in English. It is capable of dictating email, sending, replying, searching the Internet and carrying out other basic computer tasks.7. Micro Intro Voice II A complete voice input and output system with an accuracy rate of more than 98%. This is a powerful piece of software and its available for large or small networks.8. ViaVoice Millennium Pro It uses continuous speech and is capable of desktop navigation; inputting, editing, and formatting text; proofreading; and direct dictation. There are also legal and medical dictionaries available.These are eight of the voice recognition software choices, but there are many other excellent programs. Do a quick search online and youll have lots to choose from. Do your research and ensure the voice recognition software you choose will meet your needs.

    An Easy Way to Build a Home Network

    If you have more than one computer at home, you are probably better off connecting them or networking them together to use the same resources and receive the same internet connection. A home network is very easy to build. Here are some tips.There are two main types of home networks, wired and wireless. While wired home networks are popular, but they require you to run wires from one computer to another. You might have to drill holes in a wall or run wire under the carpet. If you dont want cords running all over the place, you can easily get rid of them with a wireless home network. Wireless home networks are extremely simple to set up. You only need a wireless router and a wireless networking card for each additional computer you would like to hook up. Most wireless networks can send and receive data lightning fast at megabytes per second. Wireless networks are extremely inexpensive, you can hook up a few computers for less than $200. The great part of wireless networks is that all computers on the wireless network can use the same internet or other resources such as a scanning machine and printer. So if you are looking for a great way to share data and resources among your home computer, choose to build a home network.More information is available at http://www.home-00.info

    Summary

    The DC Power Supply is a rather fundamental electronic device, however there are hundreds of DC Power Supply products on the market from dozen of manufacturers. Narrowing down the best product for your application and budget can be a daunting task. This article addresses DC Power Supply differentiators, functions and the applications they are best suited for. The articles focus is DC Power Supplies used by engineers, manufacturers, quality professionals and electronic hobbyi...