Quantum generators

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  • • Imagine an atom with excess energy. Without external action, the atom would, after a period of time, spontaneously emit light, whose properties (e.g. its direction) are random — only the energy is fixed. • This situation changes when the atom is shone with a light wave of the corresponding energy. There is then a higher probability that the atom will also simply copy the remaining properties of the incident wave: It then emits light that is in step with the original and propagates in the same direction....

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  • Research activities in laser physics and in photonics technologies over the last two decades have continuously produced a large diversity of new advances. Several examples illustrate the major impact of optics in the quantum sciences, engineering, metrology, communication fiber networks, or high-capacity data storage. Besides these established fields of research and development for industry or for the consumer markets, laser optics will certainly disseminate in the near future in new areas such as biology, chemistry, medicine, or nanotechnologies.

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  • A new type of semiconductor laser is studied, in which injected carriers in the active region are quantum mechanically confined in localized finite self-assembled wire-like quantumdash (Qdash) structures that are varied in sizes and compositions. Effects of such carrier distribution and quasi three-dimensional density of states contribute to a quasisupercontinuum interband lasing characteristics, which is a new laser design platform as compared to continuous broad emission spectrum generated by nonlinear media pumped with ultrashort laser pulse....

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  • We prove that the sequence of projective quantum SU(n) representations of the mapping class group of a closed oriented surface, obtained from the projective flat SU(n)-Verlinde bundles over Teichm¨ller space, is asymptotically u faithful. That is, the intersection over all levels of the kernels of these representations is trivial, whenever the genus is at least 3. For the genus 2 case, this intersection is exactly the order 2 subgroup, generated by the hyper-elliptic involution, in the case of even degree and n = 2. Otherwise the intersection is also trivial in the genus 2 case. ...

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  • The response of Hollywood was to embrace some of this material. A landmark move was the decision by Columbia to distribute Easy Rider (1969), a project originally destined to become another biker picture for AIP. The success of Easy Rider helped convince the studios to invest in a new generation of filmmakers seen to be more in touch with the youth audience affected by the 1960s counterculture. Hollywood learned other lessons from the independents in this period.

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  • One of several current trends in distributed database system de- sign is a move away from supporting traditional ACID database transactions. Some systems, such as Amazon’s Dynamo [13],Mon- goDB [24], CouchDB [6], and Cassandra [17] provide no transac- tional support whatsoever. Others provide only limited transaction- ality, such as single-row transactional updates (e.g. Bigtable [11]) or transactions whose accesses are limited to small subsets of a database (e.g. Azure [9], Megastore [7], and the Oracle NoSQL Database [26]).

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  • Michael Alley Mechanical Engineering Department Virginia Tech Blacksburg, VA 24061 USA alley@vt.edu Cover photographs: (Top): Richard Feynman, Nobel prize winner in physics, lecturing on quantum mechanics (courtesy of the Archives, California Institute of Technology, photo 1.10-118). In this photo, Feynman demonstrates the value of communicating with gestures. Gestures and other aspects of delivery are discussed in Chapter 5. (Bottom left): Lightning demonstration at the Deutsches Museum in Munich, Germany (courtesy of the Deutsches Museum).

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  • Automation is the use of control systems (such as numerical control, programmable logic control, and other industrial control systems), in concert with other applications of information technology (such as computer-aided technologies [CAD, CAM, CAx]), to control industrial machinery and processes, reducing the need for human intervention. In the scope of industrialization, automation is a step beyond mechanization.

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  • The characteristics lines in X-ray spectra result from electronic transitions between inner atomic orbitals. The X-ray spectra for most heavy elements are much simpler than the UV/Vis spectra observed in ICP-OES, for example. (Only a few lines!!!) Big difference between X-ray and UVVis: The radiation is ionizing, and doesn’t just excite electrons to higher levels. Moseley’s law: Predicts the basic relationship of atom number and the frequency of the characteristic lines

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  • The quantum of wastes generated in urban centres has become one of the difficult tasks for those responsible for their management. The problem is becoming acute specially in economically developing countries, where there is a financial crunch, and other resources are scarce. Although, there are varieties of publications dealing with various topics of solid waste management, most of these documents have been published addressing the needs of developed nations.

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  • Tham khảo sách 'automotive electromagnetic compatibility (emc)', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả

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  • Among the branches of classical physics, electromagnetism is the domain which experiences the most spectacular development, both in its fundamental and practical aspects. The quantum corrections which generate non-linear terms of the standard Maxwell equations, their specific form in curved spaces, whose predictions can be confronted with the cosmic polarization rotation, or the topological model of electromagnetism, constructed with electromagnetic knots, are significant examples of recent theoretical developments. ...

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  • It is by now well established that quantum machines can solve certain computational problems much faster than the best algorithms known in the standard Turing machine model. The complexity question of which problems can be feasibly computed by quantum machines has also been extensively investigated in recent years, both in the context of one machine models (quantum polynomial classes) and various flavors of multi-machine models (single and multiple prover quantum interactive proofs).

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