Conventional transmission

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  • Transmission electron microscopy (TEM) is a technique where the electron-beam is transmitted through an ultra-thin specimen, interacting with specimen as it passes through it. An image is formed from the interaction of the electrons transmitted through the specimen, which is then magnified and focused onto an imaging device, such as a fluorescent screen, a photographic film, or a charge-coupled device (CCD) sensor. This technique is capable of imaging at significantly high resolution than the light microscopes, owing to the small de-Broglie wavelength of electrons....

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  • Tham khảo sách 'the transmission electron microscope_1', kỹ thuật - công nghệ, hoá học - dầu khí phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả

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  • With the Internet much of a buzzword recently, and otherwise serious people joyriding along the \Informational Superhighway," computer networking seems to be moving toward the status of TV sets and microwave ovens. The Internet is recently getting an unusually high media coverage, and social science majors are descending on Usenet newsgroups to conduct researches on the \Internet Culture." Carrier companies are working to introduce new transmission techniques like ATM that o er many times the bandwidth the average network link of today has....

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  • Branchless Banking (BB) represents a significantly cheaper alternative to conventional branch-based banking that allows financial institutions and other commercial actors to offer financial services outside traditional bank premises by using delivery channels like retail agents, mobile phones etc. BB can be used to substantially increase the financial services outreach to the un-banked communities. These guidelines are being issued as part of the broader strategy to create an enabling regulatory environment to promote branchless banking.

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  • Susan L.Lindquist*† and Steven Henikoff‡ *Whitehead Institute for Biomedical Research, Massachusetts Institute of Technology, Cambridge, MA 02142; and ‡The Fred Hutchinson Cancer Research Center, Seattle, WA 98109 Over the past half-century, the central dogma, in which DNA makes RNA makes protein, has dominated thinking in biology, with continuing refinements in understanding of DNA inheritance, gene expression, and macromolecular interactions. However, we have also witnessed the elucidation of epigenetic phenomena that violate conventional notions of inheritance.

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  • Geographic structure is not yet included in the size model. In both configurations, synthesis maintains a full age-structured description of the population and employs conventional equations to describe the population dynamics. A wide hierarchical range of model complexity can be defined for either version (Methot 1998). At one extreme, the model can be used with no age or size data (with external estimation of selectivity and weight-at-age) and the est imation process can be condensed to a few stock-recruitment parameters that mimic stock-reduction analysis (Kimura and Tagart 1982).

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  • Not all materials can be etched in an easy and cheap way. Especially, noble metals or tantalum are stable against most of these corrosive structuring methods. Hence, precision machining may be used to generate microstructures from these metals as well as from standard metal alloys such as stainless steel or hastelloy. Depending on the material, precision machining can be performed by spark erosion (wire spark erosion and countersunk spark erosion), laser machining or mechanical precision machining.

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  • Thenotionthatinflation targeting increases the likelihood of stock market boom- bust episodes contradicts conventional wisdom. We take it that the conventional wisdom is defined by the work of Bernanke and Gertler (2000), who argue that an inflation-targeting monetary authority automatically stabilizes the stock market. The reason for this is that in the Bernanke-Gertler environment, inflation tends to rise in a stock market boom, so that an inflation targeter would raise interest rates, moderating the rise in stock prices....

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  • Conventional optical instruments make use of light that is transmitted between different locations in the form of beams that are collimated, relayed, focused, or scanned by mirrors, lenses, and prisms. Optical beams diffract and broaden, but they can be refocused by the use of lenses and mirrors. Although such beams are easily obstructed or scattered by various objects, this form of free-space transmission of light is the

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  • Advanced RF/Microwave Filters There have been increasing demands for advanced RF/microwave filters other than conventional Chebyshev filters in order to meet stringent requirements from RF/microwave systems, particularly from wireless communications systems. In this chapter, we will discuss the designs of some advanced filters.

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  • Mobile communications channelstypically exhibit time-variant channel quality fluctuations [ 131 and hence conventional fixed-mode modems suffer from bursts of transmission errors, even if the system was designed to provide a high link margin. As argued throughout this monograph, an efficient approach of mitigating these detrimental effects is to adaptively adjust the transmission format based on the near-instantaneous channel quality information perceived by the receiver, which is fed back to the transmitter with the aid of a feedback channel [ 151....

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  • Adaptive Modulation Mode Switching Optimization Mobile communications channelstypically exhibit time-variant channel quality fluctuations [ 131 and hence conventional fixed-mode modems suffer from bursts of transmission errors, even if the system was designed to provide a high link margin.

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  • Paging Systems It is often important to be able to reach certain people very quickly. The conventional telephone network is not always optimal, because a line may be engaged or the person being called might not be available. Mobile telephone systems offer a high degree of reachability of a mobile subscriber, but MSs are not always switched on and are expensive to use. Paging systems fill a particular gap (see Table 7.1).

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  • To fulfill the ever increasing demands of internet based communication network, the speed of computing as well as the speed of data processing should be high enough with the transmission medium of enormous potential bandwidth having the vast amount of information handling capabilities. On the other hand, conventional electronic technology has already reached its ultimate speed limit (40 Gb/s) through the limitations of miniaturization of chips and bandwidth limitation, and obviously it will create data traffic jam in future internet based networking services....

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  • Changing or improving technology. Technologi cal improvements to vehicles are limited by local capacity to absorb the technology, which includes both turnover rates and capabilities for servicing and maintenance, and by the availability of fuel appropriate for the technology. Consequently, vehicle technology strategies need to be developed in response to particular local circumstances and in concert with fuel strategies.

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