➊ Disadvantages Of X Rays

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Disadvantages Of X Rays

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Some of these studies were in the laboratory. One study was on a small number of people with advanced cancer. They had a type of liver cancer called hepatocellular carcinoma. Researchers found that the low frequency waves affected cancer cells. It did not affect normal cells. And importantly the electromagnetic frequencies used in this research were not the same as those of Rife machines. Despite the evidence that low energy waves might kill cancer cells, we need more research. Only then can doctors use low energy waves to cure cancer. Rife machines can be costly. Do not believe information on the internet that is not backed up by research.

It is understandable that you might want to try anything if you think it might help treat or cure your cancer. Only you can decide whether to use an alternative cancer therapy such as a Rife machine. Many websites promote the Rife machine as a cure for cancer. But no reputable scientific cancer organisations support any of these claims. About Cancer generously supported by Dangoor Education since Questions about cancer? Call freephone 9 to 5 Monday to Friday or email us.

Skip to main content. Home About cancer General cancer information Treatment for cancer Complementary and alternative therapies Individual therapies Rife machines. Summary Rife machines use electromagnetic frequency. Supporters of the machine claim that by using a frequency that is similar to the frequency of cancer cells it can cure cancer. There is no reliable evidence to use it as a treatment for cancer. What is the Rife machine? Why people with cancer use it Rife and his supporters say that all medical conditions have an electromagnetic frequency.

How you have it The Rife machine delivers the low energy electrical energy usually through your hands or feet. Research into Rife machines as a cancer treatment Before doctors can use a new treatment, it goes through a long process of development. What a Rife machine costs Rife machines can be costly. Read more about the cost of complementary and alternative therapies. Solid ink is a 3D material used in a single nozzle Howtek squeeze style acoustical fluid chamber with sliced orifice and also used in Multi-nozzle bender or piston style fluid chambers with electro-formed orifice plates inkjets.

The Printheads must be heated. Wax based Solid ink will flow below C but Thermoplastic Solid ink prefers C close to the piezo Curie, piezo poling temperature. Piezo manufactures still insist the operating temperatures are dangerously high but the Howtek printheads work fine. Howtek style inkjets were designed to use Solid ink in 4 minutes print cycles but are now printing full 3D models [ citation needed ] that may print for 1 or 5 days at drop frequencies near 16, dpi at times. The Solid-ink is liquid at operating temperature and acts like water with sound waves slower than water forcing drops out of the orifice in the Howtek style inkjet.

Another solid ink printer, the SI, was developed and released to the market in by Dataproducts Corporation. This was a monochrome inkjet printer that met with limited success. In the s, a succession of solid ink printers capable of printing up to Tabloid Extra size were introduced, including the Tektronix Phaser III, the Tektronix Phaser , and culminating with the Tektronix Phaser in A wide-format solid-ink printer, the Phaser , was introduced in The Phaser was capable of using roll fed or sheet fed paper up to 48 inches wide. After Xerox acquired the Tektronix Color Printing and Imaging Division in , [15] [16] the solid ink technology became part of the Xerox line of office printing and imaging products.

Early offerings focused on the graphic arts industry. The Howtek Solid Ink called Thermoplastic was molded in 4 different color shapes to fit into the Pixelmaster and later in the Braillemaster printers. The Howtek inkjet invention, an improved Steve Zoltan style Alpha Jet originally was glass but Howtek molded nozzles with Tefzel , tubular nozzle inkjet operated at C was first developed in at Howtek and is still in use today in Solidscape 3D printers. Five previous Exxon employees Hock, Lutz, Peer and McMahons who had worked with Exxon inkjet technologies Exxon sold its patents to Dataproducts in were hired by RH Research starting in to develop inkjets and the state of the art printer.

In the Dataproducts patent litigation slowed the development of the printer over solid ink shapes but not over the Solid ink formulation. Delays from the litigation and Yen exchange rate changes increased the cost of the Pixelmaster printer and sales dropped of by the late s. At this time, Howtek also expanded into scanner technology to improve imagery for the color printers and also learned of negative image printing, transparency printing, Braille printing and printing digital information on rigid paper printing plates for the newspaper industry.

This led to starting a new company, Presstek, Inc. Around the first half of , Xerox discontinued selling solid ink printers. Solid ink technology utilizes solid ink sticks, crayons, pearls or granular solid material instead of the fluid ink or toner powder usually used in printers. Some types of solid ink printers use small spheres or pucks of solid ink, which are stored in a hopper before being transferred to the printing head by a worm gear or melted as needed.

After the solid ink is loaded into the printer, it is melted and used to print images on paper or any substrate in a process that can be similar to offset printing or standard printing. Solid ink printers require heated printheads. DOD use piezoelectric devices polarized ceramics and heat alters the poling. This allowed chemists to expand Solid inks into a new direction and led to a Three-Dimensional printing patent from an ex-Howtek employee. Due to the way solid ink printers put the ink onto the page, print quality is considered to be precise and accurate, with bright colors.

Excellent results can be achieved with low-quality stock, as the Solid ink covers the stock with a glossy, almost opaque, surface. Solid ink printers are able to print on many different types and thicknesses of media. They are much less sensitive to changes in media type than are color laser printers. Because solid blocks of ink are used, there is less waste generated than is with laser printers or inkjet printers, which produce empty ink or toner cartridges, in addition to packaging and packing materials. A loose ink block does not leave any residual cartridge after it is consumed - only a crushable, thin, plastic packing bag or tray and a recyclable cardboard packaging box. Solid ink printers have an advantage over ink-jet printers for situations involving intermittent use with long periods of downtime.

This is because melted solid ink that has subsequently cooled and re-solidified inside the ink-delivery pathways is a normal part of printer operation. So, this cooled-and-solidified ink does not dry out. And, while the printer is not operating, the solidified wax helps to prevent oxygen and moisture from interacting with many internal parts of the ink-delivery components. Solid ink blocks can be made non-toxic and safe to handle. In the s, the president of Tektronix ate a piece of solid ink, derived from food-grade processed vegetable oils , to demonstrate their safety. Solid contaminants must be filtered out, or ink can clog printhead nozzles when using original or compatible inks. Clogging can damage the printhead, and replacing it can be costly.

For this reason, many third-party ink manufacturers provide a guarantee and will pay for the replacement of a damaged printhead. Xerox also provides its own warranty. When the device is cold, the first page it prints may take several 10s of minutes to finish printing, as the printer needs to warm up and melt the ink. Once the printer has warmed up, ink can be melted significantly faster, so the melting process will have a much less noticeable negative impact on the overall speed at which additional pages are printed. The ink must be heated, and a large portion of the printing mechanism must be kept at or near the ink's melting point during use.

When the printer is in "sleep mode", most units keep a small pool of each color wax within the printhead heated to a temperature just above the ink's "freeze point". According to the Xerox service manual, this consumes about 50 watts. Every time the printer loses power for long enough to cause the portion of ink which was being kept above its "freeze point" in the printhead to drop below that temperature, the mass of ink in each reservoir would have contracted in size enough as a result of the cooling to permit air to enter the printhead, which would result in print aberrations until the printhead reservoirs had been refilled by the ink-melt assembly above it.

As a result, the printhead is then purged using a vacuum pump, causing some ink to be flushed from the printhead's holding tanks into the waste tray to remove the air from the printhead. Xerox printers have a "waste ink" tray for this purpose. Since all four inks are dumped into a unified "waste ink" tray, it is impossible to reuse the lost ink since the four process colors coalesce to form a single solid mass in the tray, which look much like solidified candle wax drippings, but almost black. If the printer was in its sleep state, less time without power would be required to necessitate a purge cycle than if the printer was in its ready-to-print state since the printhead is kept much hotter when ready-to-print.

The printer contains melted wax when at operating temperature , and owners' manuals warn that it cannot be moved until it has completed a special cool-down cycle selected from the machine's control panel. It is recommended to provide a minute cool down time from the point of removing main power, however all modern solid-ink printers have a shutdown cycle which use fans to solidify the ink in less than ten minutes, with the added benefit of physically restraining the printhead to prevent damage during moving or shipping. The manuals warn that substantial damage is possible otherwise, requiring servicing by a trained technician if not properly cooled down before moving the printer.

Moving the printer before cool down completes can damage the print head by spilling molten ink between reservoirs of different color as well as over other components inside the printer motors, belts, etc. Because of the liquid-ink-spillage concern, solid-ink printers are not suitable for mobile usage, such as on movable carts for printing pricing tags in retail settings. Unlike some inkjet printers where the cartridge includes the print head, the printhead in these printers is fixed.

Over time, parts of the printhead may become permanently clogged, resulting in unsightly streaks, but there are printhead and drum cleaning cycles and jet-substitution options which can resolve most printing issues. Dust caused by the use of cheap paper may cause printhead clogging, which is why Xerox recommends the use of papers that are not prone to giving off dust and fibers during regular usage.

Paper dust may also accumulate as debris inside the printer; this could cause abrasions on the drum and may mimic a weak or missing jet.

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