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arc rectifier in a conversion station or aboard the train (if fed with 16.7hz?), and/or a potentiometer were necessary for smooth speed control. AC traction and thus also AC power began being more widely adopted with the advent of VFD technology, which uses IGBTs to smoothly control motors. AC motors are more efficient, have higher power densities and no brushes to replace or that wear out and create dust, unlike DC motors. However, AC's efficiency varies with load and speed so does their torque? AC is superior to DC. It is more efficient, more power dense and requires less maintenance. Although variacs could have been used earlier in trains to regulate their speed it would have come at the cost of efficiency and heat generaion as the efficiency and thus heat gen of ac depends on the amount of slip between the rotting magnetic field and rotor, variacs only vary voltage and thus field strength, not hertz, so for example it would have resulted in inefficiency when from a standstill, during acceleration, anywhere the motor is not at full speed, variac only regulated voltage and thus field strength when what is necessary is only frequency control
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upstream signals, and originates at a fiber, optical node, the node connects through fiber optic to the headend or distribution hub where the signals are converted again into RF in an hfc transmitter receiver like Arris ch3000 and Cisco Prisma II, which emit two RF signals one strictly for downstream and other for upstream then through headend rf management modules like splitters and combiners to join into single cables all services from the hub like video and internet, and then into equipment like I cmts for internet, edge qam for video from other sources and internet from m cmts, and video and internet from a CCAP which is similar to an I cmts but with edge qam functionality For i CMTS vs m CMTS see CMTS I CMTS is monolithic, has in a single box RF outputs for the HFC network and NSI interface M CMTS has a core such as an icmts core, which has an NSI, and it's also connected to edge qams for the RF output for the HFC network M CMTS has extra complexity due to two parts that have to be connected and work together but this way it's more scalable than I cmts
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rigid and flat and have adhesive along the entire length of the fibers that holds the fibers in the ribbon together. Free form ribbons can change shape, which reduces the space needed for fibers in a cable as it allows for the fibers to be packed in an hexagonal grid, while with traditional ribbons, the ribbons force the fibers to be arranged in a square grid. In a freeform ribbon the glue is only placed at certain intervals along the length of the fibers which allows free form ribbons to be flexible in shape. Fiber optic cables with up to 6912 fibers have been developed by several manufacturers for use in cable ducts. Cables with over 864 fibers, have several groups or tubes of fibers to aid in identification of individual fibers. Each fiber has a thin barrier layer covering the cladding that can be colored to identify the fibers. Fibers can be 250 microns to 200? Microns in diameter 6912 fiber cable fiber diameter
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small cells, picocells and femtocells are more likely to be integrated and Metro or macro cells are more likely to be separated and be referred to as radio sites. A Cell or small or metro cell can be self contained, and highly integrated as a single device with an antenna and integrated radio, or instead of a cell, a phone can connect to a larger cellular tower or radio site with antennas, driven by separate, remote radio units or heads, possibly with software defined radio or sdr technologies, that are connected to a providers' network via fiber optics, for example. These cells are spacially distributed in an area to provide consistent coverage to mobile phones, and avoid high power transmission towers which require special permits for operation, as the geographical distribution of the cells allows for each cell to have a low output power.
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be installed indoors iDAS or outdoors (ODAS). The radiofrequency signals from the RRUs or RRHs is converted to light via a radiofrequency over glass (RFoG) node or transmitter/receiver (platform, optics platform) at the headend and transmitted via optical fiber, to which the antenna nodes are connected via interfaces such as cpri. The antenna nodes have an antenna, a receiver, which converts the light into radiofrequency, and a transmitter, which converts radiofrequency to light. The
Radiofrequency from the receiver is fed into an amplifier and into the antenna, and Radiofrequency from the antenna is fed into an amplifier and into a transmitter for conversion into light for transmission over optical fiber to a receiver at the headend, hub or central office.
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machines in the late 90s, as the sole euvl machine developer and manufacturer worldwide. The japanese were the first, in 2003 to develop a 10khz repetition rate euv laser light source, and had plans to develop an alpha 10w light output euvl tool by 2006. Nikon never released an euvl tool (machine). Canon, which was also a part of the consortium, and also had plans for an EUVL tool, switched its focus to nanoimprint lithography. Gigaphoton also made advances in euv light source technology. Ushio in 2020? Eventually released its own euv light source. A japanese company is the only one worldwide that makes euvl mask inspection machines that can inspect the different layers of euvl masks in 3d without delayering.
421:. Raster graphics have a fixed pattern called a raster so no vector generator is necessary, whose speed and thus image complexity is limited by the speed and miniaturization (number of transistors) of semiconductors? Thus Raster monitors were a large leap and revolution in flexibility and image quality? at the time as they require less advanced ICs while also providing higher flexibility, quality and more predictable precision? Raster graphics require more ram in order to store the color value of every pixel while this was not necessary in vector monitors which only needed to store a set of (fewer) points as cartessian coordinates
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earlier halogen) format, finally making them competitive with crts while having the potential to make projectors smaller lighter, brighter (than crts of the same or larger size) and cheaper than earlier larger xenon digital projectors which gave them an advantage over crts. Digital projection delivers digital data to the image generating element such as an lcd, dmd, lcos etc. At the same time dlp technology, which uses a dmd, was developed and the first dlp projectors made.
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movement: someone bumping into either type of projector would have caused the image to become distorted for 10 minutes. both had similar running costs but talaria was 100 times more long lasting. talarias were brighter but also more complicated than crt projectors of the era, so talarias were only used for large screen, high profile events and in many cases venues had a person dedicated to maintaining and operating it.
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or a red led, a spinning wheel is used to distribute the heat caused by the laser into all of the phosphor in the wheel thus delaying degradation, also ceramic is used in the wheel as it is more heat resistant lasers have longer lifetime, no restrictions on mounting position, lower heat leading to lower ac costs, but rgb laser may color shift over time but this can be corrected with calibration
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had been thought. Adoption of EUVL tools was repeatedly delayed; first to 2005? Then to 2008? Then to 2012? then to 2016? It wasn't until 2018? that EUVL tools finally started to be used in integrated circuit chip mass production by samsung, then tsmc, micron, sk hynix and intel. Globafoundries planned to use euvl but it was cancelled together with their 7nm development efforts.
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miniaturization advances, vector monitors were abandoned and replaced with raster monitors, which can display more detailed and complex images not practical with vector monitors such as (color and grayscale) photos thus increasing flexibility and quality and with more predictable precision?. The adoption of raster displays was led by
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Mobile phones or cellular phones connect to device technically called an eNodeB for 4g, gNB for 5g, nodeb for 3g, or base transceiver stations or bts for gsm or 2g connections, implemented as either cells which integrated antennas and radios, or as cells with separate antennas and remote radio units,
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DC traction motors and thus DC power was used in early electric trains because the smooth acceleration required in trains was easier to achieve when coupled with the technology of the era. The torque and speed of DC scale linearly alongside supply voltage, and efficiency does not vary. Only a mercury
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the fibers may be organized into ribbons, each consisting of 12 fibers but this amount depends on the cable. this allows for fast mass fusion splicing of cables which reduces the time needed to splice the cables, and allows for faster identification of individual fibers, the ribbons are traditionally
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dlp technology began replacing crts in 1997, and overhead and slide projectors in around the same time. also digital dlp cinema projectors were developed to replace film projectors, but their use would not yet become widespread because of their low resolution of dci 2k (full hd, but with 2048 instead
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Euvl tools require a large co2 laser, the co2 laser generates laser light pulses that then strike a tin droplet as it falls, the droplet is struck twice with separate pulses before it generates euv light. The laser may be in the subfab where it requires its own small cleanroom. The light from the co2
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For refrigerant article: nontoxic refrigerants did exist but they had a strong odor. Since modern hermetic compressors did not exist, open ones were used which are prone to leaks. so toxic but odorless refrigerants were used. it was thought that since the toxic refrigerants were heavy and thus would
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But video projectors were still large, so in the 1980s the first modern, tabletop sized projectors were developed. The first was an epson lcd projector with a halogen lamp, similar to those used by slide and overhead projectors. Unlike slide and overhead projectors, these new projectors could change
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Around the same time, the first color crt projectors were developed. were they large? CRT projectors wouldn't become widely used until the 1980s with the advent of personal computers, since crt projectors are dimmer and better suited for small projection screens. And even then in the 1980s they were
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or needle shaped metal particles (the latter of which are coated in a passivation layer), perhaps atop an insulation layer between the pet and magnetic layer to increase performance even further. Lto computer storage used to use metal particles known as metal particulate. and can use barium ferrite
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9 Japanese companies in the late 90s formed a consortium funded by the japanese goverment's mext program to develop euvl machinery. They all backed out in the mid-2000s and nikon was left developing the technology on its own until at least 2010. This left Asml, which had also started to develop euvl
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EUV lithography (EUVL) was first proposed in the mid?-90s, and the first EUVL tools began to be developed shortly afterwards, and were at first expected to be used in mass production a few years later, in the early 2000s. However the challenges of EUVL were much more difficult to overcome than what
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Distributed antenna systems (DAS), differ from the cell architecture by serving an area with spacially distributed antenna nodes, that are driven by remote radio units (RRUs) or heads (RRHs) located in a central location such as a headend, distribution hub (hub) or central office. These systems can
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such as text and diagrams could be practically displayed. The path of the electron beam (in the CRT) of a vector monitor varies according to the content it is displaying and is generated on the fly by a vector generator ic. As (video) RAM became available in megabyte quantities due to semiconductor
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in 2014? laser illuminated projectors were developed to replace uhp lamps. there are several laser methods but the most common and used in consumer projectors is a spinning phosphor wheel that converts the blue laser into white light, the white light may be asissted by other lasers such a red laser
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In 1995, uhp ultra high performance, high pressure mercury hpm or ultra high pressure lamps were developed, exclusively with small digital (vs crts which themselves require an analog image input) projection in mind. These could provide a lot of white light in a small and long lasting (compared with
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Barium ferrite is used in lto tapes due to its higher coercivity at a smaller magnetic particle size which allows particles to be closely packed. Strontium ferrite tape was first demonstrated by ibm and fujifilm in 2020 and is expected to replace barium ferrite in the future as it allows for higher
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Customers in an HFC network are grouped into service groups. A service group in the context of an HFC network, has a trunk to which all customers connect through distribution taps. The trunk may have distribution amplifiers to extend the length of the trunk which is a single one for downstream and
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CRT computer monitors were replaced with LCD computer monitors in the early 2000s. LCD monitors require much less space in a desk, weigh much less and emit less heat. OLED computer monitors, which offer superior color reproduction and contrast ratios became available in the late 2010s and are more
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hydrofluoroolefin: history, synthesis patents? same for cfcs and hcfcs? the need for no odp, low gwp, nontoxic and nonflammable refrigerants and blowing agents to replace earlier cfc, hcfc, and hfcs led to the exploration of alternatives. it was proposed in the 2000s that hfcs should eventually be
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Thus the eidophor was developed in the 1950s, which strikes electrons in a beam against a plate with oil on the opposite side. The electrons charge the plate electrostatically, changing the direction of reflectivity of the oil and thus controlling the image. The oil side was illuminated by a xenon
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The first video projectors were crt projectors, which were first used in the 1930s. However because of how CRTs work, there is a limit to their maximum brightness and thus size of images. For example, for higher brightness, higher voltages are required which can be difficult to handle, and because
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Magnetic tape is made in large rolls from which tape reels are made by slitting which is cutting (slitting) the tape from the roll longitudinally into relatively narrow sections as the roll is unwound, the narrow sections are then wound into tape pancakes which are tape reels with hubs but without
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expand ge talarias in the 70s and 80s used xenon lamps and replaced and were similar to eidophor in working principle and both required a great deal of warmup time talaria 30 min vs eidophor more than an hour, also both suffered from the unique problem of being sensitive to sudden changes in
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Magnetic tape is often made on PET plastic tape, because it can not be stretched easily and is chemically and dimensionally stable. Alternatively PEN can be used instead of PET as it has superior mechanical properties but is mord expensive. Tape often has an anti curling layer on the
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there are also pure laser projectors such as microvision, but since they project laser light their use has been limited christie rgb rack and barco rgb laser project laser light? r and g or b or some other combination of laser light projected in some other projectors?
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Euvl allows for a dramatic reduction in mask count and hence process steps for a single layer, when compared with duv krf arf? Excimer laser lithography dual, triple or quadruple pattering, opening the way for an increase in productivity, building layers faster.
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banned or at least phased down (their use restricted). one of these alternatives is hfos, first synthethized in 2010 at dupont by kostromaris. less than a decade after their first synthesis they began to be adopted in refrigeration.
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many VCRs and VTRs had dynamic tracking heads where the heads were placed on the end of a piezoelectric element, this allowed the heads to more precisely follow the video tracks during slow play and shuttle picture searching
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receive relatively simple and small (in RAM) cartessian coordinates from the computer and display and optionally connect them on the screen. In this way graphics could be displayed with very little RAM, but only
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lamp, which was also a new technology that replaced carbon arc lamps in use in film projectors at the time, the change in direction of reflectivity is similar to how a dlp projector works.
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the image instantly and display an image directly from a computer. CRT projectors with similar functionality but larger size (but still tabletop sized) were also developed at this time.
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The magnetic layer is applied to the pet as slurry containing magnetic particles suspended in binder and perhaps lubricant that is dried in an inert atmosphere oven to induce polymer
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however higher performance tapes such as those used in videotape such as some vhs tapes, type iv metal cassette tapes and computer tape storage have magnetic chromium dioxide
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The magnetic layer is polished by running the tape through polished pressure rollers to reduce friction between the tape and tape head, giving the tape a mirror finish.
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Metal evaporated tape whose magnetic layer is applied by running the tape through a vacuum chamber where metal is evaporated and condensed on the tape also exists.
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Liquid lubricants may be mixed with the binder in addition to the insulator to allow higher writing speeds, useful in videocassette tape and lto tape.
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crts work by colliding electrons against phosphor, heat is created in the phosphor which may require cooling, also the phosphor is prone to burn-in.
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The radio access network is the access network made up of antennas radios, cells and other components that connect mobile phones to mobile carriers.
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The magnetic layer on the tape is often made of needle shaped iron oxide particles (with a low coercivity of 400 oersted) together with an acrylic
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Early computer monitors were vector, cathode ray tube (CRT) monitors and were rather primitive since there was an urgent need for them.
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Finished writing a draft article? Are you ready to request review of it by an experienced editor for possible inclusion in
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used only in relatively small screens such as living rooms and office meeting spaces for displaying TV or computer images.
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in the 2010s, film projectors were replaced by 4k digital projectors which are usually compliant with the dcp standard.
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Hamr recording has been envisioned for use in high capacity magnetic tape in the future. Giant magnetoresistance tape
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https://spectrum.ieee.org/semiconductors/nanotechnology/euv-lithography-finally-ready-for-chip-manufacturing
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end caps, which are normally on both ends of the reel to protect the edges of the tape when on the reel.
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in the 2000s the first ultra short throw projectors were made by japanese companies.
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expensive, so they are used in specialized applications such as post-production.
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fall and stay on the floor in case of a leak, they would be safe in practice?
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https://www.snia.org/sites/default/files/OsamuShimizuAdvanced_BF_Tape-2.pdf
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Sole tspes used metal evaporste tape, or cobalt oxides for cassegte tape
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https://www.eetimes.com/canon-plans-euv-beta-lithography-tool-by-2005-2/
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https://www.eetimes.com/japan-plays-catch-up-on-euv-lithography/
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The head usually also has a mirror finish to reduce friction.
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in the binder, adhering the magnetic particles to the pet
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Min max notation from German article vs Chen notation
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laser is fed into the tool using pipes and mirrors.
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278:Some cassette tapes have used type ii cobalt oxide
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