Technology – Page 15

A Look At Who Has A Hidden Security Camera And Why

Many different types of organizations rely on hidden cameras to bolster their security. Hidden security cameras are appropriate for businesses with many employees and sensitive information or valuable items. They are also appropriate for governmental organizations and families, among other groups.

Many businesses opt for a combination of hidden cameras and visible cameras. The visible ones serve as a deterrent to would be thieves while the hidden ones can monitor the more sophisticated thieves in the event the visible ones are disabled. Banks, casinos and large businesses use a combination of the two types of security camera systems to achieve the maximum desired results.

When employees are stealing, the hidden camera system is the most successful at catching them in the act. Clever thieves will note the angle and ability of the visible cameras especially ones that pan back and forth around a room full of people. Cameras that do this leave blank spots in their field, several seconds perhaps where a particular area is not being photographed. A clever thief will time his nefarious activities to coincide with those blank spots to avoid detection. But if he doesn’t know where the camera is that’s watching him, if he can’t time out a blank spot in the coverage, then he’s more likely to get caught committing his dirty deed. That’s the purpose of the hidden camera.

The infamous “nanny-cam” has caught more than a few nasty nannies, who were ignoring the young children in their charge, or worse, abusing them. The tapes made the rounds of various news programs on TV and a new industry was born. Now there are wireless, battery operated cameras hidden in common household items like radios, and planters that an unsuspecting nanny would never find. As technology improves and electronic items get smaller and better, hidden security cameras will become more readily available than they are today.

A Look at Used Metal Detectors

There are many kinds of metal detectors – gold detectors, coin and jewel detectors, relic hunting detectors, beach-hunting detectors, and underwater metal detectors. Buying a metal detector can be a tricky affair. Before one decides to buy a metal detector, here are a few points to consider.

How often will it be put to use? If it is for a new hobby, it may be a good idea to buy a one with a lot of features.

Where it will be used? Will it be used on the beach, underwater, or in the woods?

Who will use it? If it for use in the family, there are detectors that have adjustable arm cups and separate pouches to mount the electronic box.

How much will you spend on a detector? It is advisable to be a little flexible in this regard so that one can buy one that most suits the requirements.

Buying used metal detectors usually offer the best value for your money. It is always best to buy used metal detectors from a respected dealer, rather than a classified ad. Most dealers offer a money back guarantee or a trade-in option. If you are buying from someone other than a dealer make sure it is someone you know and trust. Most dealers sell only tested metal detectors.

Prices of used metal detectors vary from $275 to $700 for all-purpose metal detectors. Underwater metal detectors can cost around $500. Most used accessories can cost $200. It is also a good idea to keep in mind that a used metal detector will not have the manufacturers warranty, but dealing with a reputable dealer will eliminate some of the risk.

A Look at Laser Toners

Laser toner is the ink for laser printers. It is an extremely fine synthetic powder (usually plastic) packed into a cartridge. You insert the cartridge into your laser printer according to the manufacturer’s instructions. When the printer goes to print a page, there are several steps to the process:

1. The printer receives an image from your computer.

2. Lasers project the image onto an electromagnetic drum.

3. The drum is charged positively and negatively, and at varying levels of charge, according to the image.

4. The drum attracts the four colors of toner in the cartridge according to the charges the colors are attracted to. The four colors mix to create any of millions of colors.

5. The drum rolls the image onto a page of paper, the page goes through a heating device to melt or burn the color onto the page, and the page is ejected.

This process uses up a lot of laser toner. Typically, a laser toner cartridge will yield a few thousand pages before needing to be replaced. The drum, too, eventually wears out from all the positive and negative charges it gives off, and needs to be replaced every 10,000 – 30,000 pages. Some printers are made with cartridge-and-drum replacement units in mind, while other printers are designed to separate the cartridge and drum. This way, when the cartridge runs out of toner, you don’t have to replace the longer lasting drum with it. This saves you money.

You can buy laser toner from your printer’s manufacturer, a computer supply store, online, or at any of a number of other types of retailers. To save money, you might want to consider buying in bulk.

Three of the most popular brands of laser toner are HP, Brother, and Samsung.

A Look at Industrial Fasteners

Industrial fasteners are used in aerospace, military, construction, and other industrial applications. These are extremely strong, extremely weather resistant, and almost completely corrosion- and rust-proof. They are made from a variety of metals, including stainless steel, chromium, and carbon.

Industrial fasteners can take many forms, for many different purposes. Here is a partial list of available industrial fasteners: anchors, bent bolts, cap screws, captive panel fasteners, drywall and deck screws, eye bolts, machine screws, nuts, cotter pins, retaining rings, rivets, screw driver insert bits, self clinching fasteners, self drilling screws, self tapping screws, sems, sockets, spring nuts, thread cutting screws, thread rolling screws, thumb-and-wing screws, washers, weld screws, and wood screws.

The sheer variety of industrial fasteners is overwhelming. Chances are, however, if you are in the market for a certain type of fastener, you know what you are looking for. Workers generally learn which screws to use for which jobs on their own, or with the assistance of their supervisors, peers, and training manuals. For a complete inventory on types and sizes, you can visit the commercial industrial fastener company American Fastener at their website. Even though it is a private, for-profit company, the website makes for a wonderful, general-knowledge store for the serious industrial fastener researcher. There you will find all fastener types and specifications, along with other helpful charts and diagrams. You can also find information on proper drill bit sizes and formats, heat-treated allow fasteners, a glossary of thread terminology, and more.

Industrial fasteners come in three main sizing standards: ASTM, SAE, and ISO (the American Society for Testing and Materials, the Society of Automotive Engineers, and the International Organization for Standards). Each of these standardization organizations recommends its own method of measuring and manufacturing fasteners. None are better than any of the others, but have varying applications and purposes, depending on what job you are working on.

A Look at Industrial Air Compressors

Manufacturers and industry alike depend on the services of industrial air compressors. Most industries that use air compressors use high quality industrial-grade models. These models are different, more powerful and more expensive than ones that are used for lightweight jobs and for regular homeowners.

Industrial air compressors can be fueled by either natural gas or electricity. Most industries use natural gas to power their air compressors. Even though both types of energy used to run these industrial air compressors can be costly, many businesses find that using natural gas as a power source greatly reduces their utility costs.

Most industries use a two-stage type of air compressor for their needs. Generally speaking, this type of industrial air compressor is built for heavy-duty jobs. These offer a much higher level of air compression, as compared to smaller or compact models. Industrial air compressors usually also offer the ability to store unused air for future usage. These also can be more energy efficient because they run on a higher level of horsepower than other models; this increased usage of horsepower also creates a better working machine that is less likely to break down and requires less maintenance.

As with the purchase of any type of air compressor, those purchasing industrial air compressors need to be especially cautious of safety and quality standards. Very few industries are legally allowed to buy air compressors that are not certified by the American Society of Mechanical Engineers (ASME). Increased workplace safety and liability concerns have made it necessary for most companies to purchase high-quality, certified-devices to ensure the well-being of their employees. Some safety features may include a safety valve to use in the case of excess air pressure in the unit. The valve will automatically release air, therefore decreasing pressure, in the event of an overload of power. Without this safety device, users of the machine run the risk of causing an explosion.

A Look at DVD Shrink Wrap Systems

Shrink wrap machines use plastics to protect items from moisture and dirt during storage or transport. The plastic film is wrapped around the item and then the film is heated. It shrinks and conforms to the shape of the item, forming a barrier between the product and outside hazards. Shrink wrap systems may be small and manually operated for the home business, or large-scale automated machines used by shipping companies. Automatic machines can process more items and hour than their smaller counterparts.

DVDs can be easily shrink wrapped for a professional look that protects the DVD from the environment. Machines designed to shrink wrap DVDs work more efficiently than generic hand-held shrink wrapping systems. Some machines shrink wrap only DVDs; others can shrink wrap both DVDs and CDs. Machines specifically designed for DVDs are typically cheaper than dual systems, and can be purchased for under $5,000.

To shrink wrap a DVD with a shrink wrap machine, place a precut plastic cover on the machine’s platform, and then place the DVD on top of the plastic. Close the machine’s cover to heat seal the DVD. The sealing temperature is electronically controlled by the machine. These semi-automatic machines can shrink wrap about 200 DVDs an hour. Automated machines work twice as fast, shrink wrapping about 400 DVDs an hour.

More expensive, fully automatic machines can shrink wrap about 55 CDs or DVDs a minute, or about 3000 an hour. These machines cost about $16,000, but can also handle films other than plastic. Paper or cardboard could also be used, for example. Automated high throughput machines are portable and can sit on tables, taking up less space than floor-bound machines, but the table-top machines can shrink wrap DVDs and a comparable rate.

Several online stores sell all kinds of DVD shrink wrap systems at wholesale prices. These Web sites sell both the machines and the films need to shrink wrap DVDs. There you will find everything you need to package DVDS with a professional look.

A Look at Deck Fasteners

Deck fasteners are screws especially manufactured to fasten the many soft, thin planks of a wood en deck in place. Wooden decks must be able to withstand many different kinds of weather and corrosion, and so deck fasteners must be able to stand up to these elements just as well. Therefore, deck fasteners are usually coated with a weather-resistant coating that protects them from rust and corrosion. The coating is made of zinc plating. A steel screw plated with zinc is called a galvanized steel screw. A screw can also be coated in a ceramic material. Deck screws can also be made of stainless steel or high-copper-content screws, as these screws won’t stain the deck.

Deck fasteners are designed to drill their own hole, drive downward gradually and easily, lay flat against the surface of the deck, and be difficult to extract once inserted. For this reason, deck screws are said to be sharp-pointed, self-drilling, self-countersinking, and shallow-threaded. Sharp points eliminate the need for extra drills. The threads of a deck screw are sharp as well. The top of the shank, up at the collar by the head, flares upward, so that it sets perfectly level with the deck. The threads of the screw are set at a very gradual or shallow degree, so that the screw goes in easier. Some deck screws are even lubricated, for even greater ease of insertion.

The heads usually have a square-shaped insertion point for a square-headed screwdriver or screw gun. Square heads don’t accidentally strip as easily as Phillips-head screwdrivers.

Hidden Deck Fasteners

Hidden deck fasteners or “blind” deck fasteners eliminate screws from view entirely. Rather than drilling into the surface of the deck and into the under-support, the thin planks fit together like a simple jigsaw puzzle using a series of brackets. These brackets are attached to the side faces of the planks using screws. You screw the first or edge plank normally, and then you fit the second planks into it via a slot. Follow this series until you get to the end of the deck. Fasten the last plank in place normally, and voila! You have a new deck with no visible screws. The deck holds together as if it were one piece of wood.

A Guide to Refurbished Laptops

Computing freedom, independence, and mobility don’t have to come with a hefty price tag.

Manufacturers refurbish laptop computers that have been returned. The laptop might have a scratched screen or other minor blemish. In some cases, the laptop was an unwanted gift or its packaging was dented. The laptop is inspected by the manufacturer, tested for quality, and repackaged for sale at a much lower price.

While many new laptops can cost thousands of dollars, most refurbished laptop computers usually cost less than a couple of grand, and often less than $500. In most cases, they are as good as new and have a very low return rate. They even come with guarantees and warranties, just as you would expect with a new model.

A refurbished laptop can satisfy most people’s basic computing needs, such as word processing, running software, reading e-mail, creating spreadsheets, playing CDs, surfing the Internet, and more. Laptops allow access to all these features from anywhere.

All laptop manufacturers offer refurbished laptops, including such popular brands as Dell, IBM, Toshiba, and HP.

Computer prices are affected by type of processor, operating system, modem, and network card; size of the hard drive and RAM (Random Access Memory); and whether there is a CD/DVD-ROM/RW, a video card, a sound card, and zip drive. Prices are also affected by screen size and type of chassis.

The price will be affected by all these specifications, along with how well preserved the chassis is, the name of the manufacturer, and whether you acquire the laptop form the factory or through a private dealer. Private dealers charge less, but beware: not all dealers are up to par with their refurbishing skills. Be sure to go to one that is reputable and experienced.

A Guide To Plasma Televisions

One of the newest additions in television technology, Plasma Televisions are the 21st century display devices which are fast becoming a popular choice among television viewers. Plasma televisions have higher resolution and quality performance than other conventional televisions; they guarantee crisp and clear images, and superior quality.

Plasma televisions became a reality after the successful invention of the plasma display panel in 1964, by Donald L. Bitzer and H. Gene Slottow at the University of Illinois at Urbana-Champaign. Embracing a unique technology, Plasma televisions produce pictures from a combination of inert gases such as xenon and neon. When the gas is charged using electrodes, the atoms collide with each other and release energy in the form of invisible ultra violet (UV) light. The light is then focused on the three phosphors (red, green, and blue) and a brilliant picture is produced.

Plasma televisions come as Enhanced Definition TV (EDTV) with a resolution of 852×480 and the Higher Definition TV (HDTV) featuring a native resolution of 1024×768. Plasma televisions have a high widescreen aspect ratio – the ratio between the width and height of the screen. As plasma televisions do not use any electron beams like the conventional ones, they are immune to the effects of magnetic fields. They offer a wider viewing angle and accurate image reproduction. Plasma televisions are slim and space-saving and can even be hung on a wall. Moreover, most of the plasma televisions come with a flat screen which eliminates edge distortion.

Plasma televisions can be used in meeting rooms, corporate offices, and network control rooms. They are ideal choices for home-theater enthusiasts. On account of quality performance in ambient light, plasma televisions are widely opted for teleconferencing.

A countless number of retail and online stores specialize in plasma television sale. Due to their inherent merits, plasma televisions are becoming the most demanded alternative to the standard CRT and projection televisions.

A Guide to Garage Door Openers

Garage doors are no longer the regular roll-top ones, which have to be pushed up by hand. These days, garage door openers are provided with various accessories to make opening easier. No matter how heavy the garage door, it can be fitted with the right kind of opener. These openers ensure utmost safety and security for garages under any conditions. They are also provided with several options and in various designs to suit the exact requirements of the user. The best thing is, they can be installed within 3-5 hours (even do-it-yourself ones). A professional can install a garage door opener in 1 hour!

Garage door openers are of two kinds depending on the use: residential and commercial. In the commercial range of garage door openers, the main models are: Trolley, Jackshift, Hoist and the Slide models. While Trolley openers are used for standard lifting on sectional doors, Jackshift is used for grilles, rolling doors and shutters. Hoist operators are similar to Jackshifts but they are also suitable for heavy duty industrial doors. The slide door openers are meant for single and bi-parting slide doors and also for fire doors.

The main step in purchasing a garage door opener is to determine the actual drive system. Garage door openers are of three kinds depending on the drive system: belt driven, chain driven and direct drive. The most important points to be considered in a garage opener system are the kind of motor and the horsepower. Garage door openers differ in speed also. The average speed is 7 inches lift/drop per second. There are openers that operate at even double this speed.

Garage door openers are provided with different kinds of warranties. Safety is another important aspect while choosing the right garage door opener. It is mandatory that all automatic door openers should be equipped with a non-contact invisible beam system that can sense the approach of a person and make the door to reverse back to the open position. Other mandatory features of garage openers are: automatic lights, a timed reversing feature, a manual emergency release cord and a force adjustment feature.

Garage door openers are usually noisy but some advanced models are being designed to be really quiet. Proper maintenance and lubrication would also lessen the noise made by garage door openers. On the whole, garage door openers should be weather resistant, safe, and should have the least wire exposure for long life.

Garage doors can also be operated by a remote control. This is especially useful for people who have homes with multiple garages. However, it is better to have a rolling radio signal code for the control as it is easy for thieves to capture the code from thin air. Garage door openers can also have an automatic light, remote control and a wall operator, as well as the option of single/two/three button transmitters.