970 resultados para uni-traveling-carrier


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Az EU-ban, a mai állapotok szerint, csak „transzferunióról” beszélhetünk és nem egységes piacról. Az eurós pénzfolyamatok eltorzítva közvetítik a versenyképességet is: mind az árukban és vagyontárgyakban, mind – főleg – a pénzügyi eszközökben megtestesült munkákat/teljesítményeket rosszul árazzák. Egy ilyen keretben különösen könnyen alakul ki az, amit potyautas-problémának nevezünk, vagyis ahol tényleges vagy mérhető teljesítményleadás, vagy éppen fizetés nélkül lehet fogyasztani, és túl olcsón lehet szabad forrásokhoz jutni. Az eurózóna számos közvetítő mechanizmusában is tökéletlen. A sok, szuverénadósság-présbe került tagország között van kicsi, közepes és nagy is. Ez a tény, valamint az általános növekedési és munkapiaci problémák, egyértelműen „rendszerszintű zavarokat” jeleznek, amelyeket ebben a dolgozatban teljesítmény közvetítési-átviteli problémának hívunk, és ezért egy szokatlan, ám annál beszédesebb, elektromosenergia-átviteli rendszeranalógiával segítünk értelmezni. Megmutatjuk, hogy egy jó nagyvállalat miért jobb pénzügyi tervező, mint egy azonos méretű állam. _____ Why are ill-defined transfer mechanisms diverting valuable assets and resources to the wrong destination within the EU? Why do we witness ongoing pressure in the EU banking sector and in government finances? We offer an unusual answer to these questions: we apply an analogy from physics (from an electric generation and distribution network) to show the transmission inefficiency and waste, respectively, of the EU distribution mechanisms. We demonstrate that there are inherent flaws in both the measurement and in the distribution of assets and resources amongst the key EU markets: goods, money and factor markets. In addition, we find that when international equalizer mechanism is at work (cohesion funds allocated), many of these equity functions are at risk with respect to their reliable measurement. Especially are at risk the metered load factors, likewise the loss/waste factors. The map of desired outcomes does not match the real outcome, since EUtransfers in general are put to work with low efficiency.

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A tanulmány röviden áttekinti, hogy milyen kihívások érték az elmúlt években az EU nemzetközi fejlesztéspolitikáját, és milyen válaszokat adott ezekre a Közösség. A Bizottság által 2011-ben kiadott Agenda for Change című zöld könyv a közös fejlesztéspolitikát erőteljesebb normatív alapokra igyekszik helyezni és a demokrácia és jó kormányzás támogatását teszi az EU egyik fő célkitűzéséve a fejlődő országokban. Mindez a gyakorlatban erőteljesebb kondicionalitást és szelektivitást fog jelenteni az európai segélyezésben. _____ The paper briefly reviews the challenges that the EU’s international development policy faced in recent years and the answers the Community has provided to these. A green paper published by the Commission in 2011, the Agenda for Change attempts to place development policy on a stronger normative basis by making the support of good governance and democracy one of the main goals of the EU in developing countries. In practice, this will mean stronger conditionality and greater selectivity in EC aid.

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Az Európai Unióban a gazdasági kormányzás reformja jelenleg négy területre irányul: a fiskális politikai fegyelem szabályok által történő erősítésére; a hatékony válságrendezés mechanizmusainak létrehozására; a tagországok államadósságaira (vagy azok egy részére) vonatkozó közös felelősségvállalás megteremtésére; valamint a fiskális unió alapjainak letételére. A fiskális unió felállítása inkább csak a hosszú távú célok között szerepel, ráadásul abban sincsen konszenzus ma még, hogy pontosan mit is értünk fiskális unió alatt. A tanulmány ezért előbb áttekinti az európai fiskális unió létrehozását megcélzó különféle, egymással is versengő koncepciókat. Majd a tagállami államháztartások bevételi és kiadási oldalait vizsgálva felteszi a kérdést: reális törekvés-e a fiskális unió létrehozása.

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A tanulmány célja: bemutatni, hogy a liberális eszmerendszer nem a bukáshoz, hanem egy mérföldkőhöz érkezett a neoliberalizmus korszakának lezárultával. A dolgozat képet ad az eszmerendszer múlt- és jelenbeli dilemmáiról, megoldandó feladatairól és válaszairól. Az Európai Unió pénzügyi és gazdasági válságát politikai válság is kíséri, amelyből egyelőre nem talál kiutat. Az írás bemutatja: mind az Uniónak, mind a liberalizmusnak van jövője, és válságaik kezelésében kölcsönösen segíthetik egymást. Mindhárom eszmerendszer – a konzervatív, a szociáldemokrata és a liberális – újragondolásra szorul. A szerző a liberalizmus újragondolására koncentrál, és bemutatja, hogy az eszmerendszer alapértékeihez való visszatérés, valamint azok gyakorlatban való alkalmazása az Európai Unió válságkezelése szempontjából kulcskérdés.

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In his dialogue - Anarchy In The Airways - Joseph C. Von Kornfeld, Assistant Professor, College of Hotel Administration, University of Nevada, Las Vegas initially states: “Deregulation of the airline industry has brought about financial vulnerability for the traveling public. The author analyzes the situation since that point in time and makes recommendations for some solutions.” In this article, Assistant Professor Von Kornfeld, first defines the airline industry in its pre-regulated form. Then he goes into the ramifications and results of deregulating the industry, both in regards to the consumer, and in deregulation’s impact on the airlines themselves. “The most dramatic consequence of the pressures and turbulence of airline deregulation has been the unprecedented proliferation of airline bankruptcies,” Von Kornfeld informs. “Prior to the deregulation of the U.S. airline industry in 1978, U.S. air carriers operated in a business environment that was insulated from the normal stresses and strains of open competition. They were restricted from actively competing with fares and routings by the Civil Aeronautics Board (CAB),” Von Kornfeld says. In leveling the playing field, Von Kornfeld offers, “Each carrier was restricted to specific geographic routes, with those routes limited to two or three competing carriers. The only thing that set carriers apart in this CAB defined atmosphere was their ability to either advertise, or to enhance their level of service; or both. “…ultimately paid for by the passenger through fare increases sanctioned by the CAB,” Von Kornfeld states. “Airline service standards were unquestionably superior during the regulated environment,” Von Kornfeld renders an interesting observation. He does mention, however, that carrier safety was also considered a concern immediately prior to, and then after deregulation. “The major controversy focused on the allegation that safety and maintenance standards would be compromised due to the financial pressures brought about by an openly competitive environment,” Von Kornfeld says. Pricing, as well as labor unions are important factors in the equation, and Von Kornfeld addresses their relevance in the deregulated environment. “The primary rationalization for deregulation was to facilitate a more openly competitive environment. The increased competition was to ultimately have benefitted the consumer. Ironically, that’s not entirely the case, Von Kornfeld elaborates. In addressing some of the negative aspects of airline deregulation, Von Kornfeld suggests that some sort of federal re-regulation may be in order.

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General note: Title and date provided by Bettye Lane.

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General note: Title and date provided by Bettye Lane.

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Inscription: Verso: Simon Thoreson, New York.

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We have investigated a hybrid mode-locked Erbium-doped fibre ring laser without optical isolator. Creating different losses in the cavity for counter-propagating pulses via net birefringence adjusting, the laser can operate in both unidirectional regimes with extinction over 22 dB, as well as can establish stable bidirectional generation.

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Noha az EU-tagságból származó előnyök a nemzetközi gazdaságtan kiforrott tételei szerint valóságosak, jól azonosíthatóak, mérhetőek és régről ismertek, mégis, egy átlagosan tájékozott brit választó számára ezek az előnyök az Egyesült Királyságban (EK) még 43 év után sem tekinthetők magától értetődőnek. A tanulmány számba veszi az integrációból származó nem triviális jóléti előnyöket, amelyekről a kiválással az EK-nak le kell majd mondania. Ezt követően egy természettudományos rendszer-analógia segítségével azt taglalja a cikk, hogy az EU mai állapotában miért inkább csak transzferunió, és annak is egy tökéletlen változata, vagyis segít megérteni, hogy az integráció, pénzpiaci és forrásközvetítői szempontból, miért működik elégtelenül.

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First-principles electronic structure methods are used to predict the rate of n-type carrier scattering due to phonons in highly-strained Ge. We show that strains achievable in nanoscale structures, where Ge becomes a direct bandgap semiconductor, cause the phonon-limited mobility to be enhanced by hundreds of times that of unstrained Ge, and over a thousand times that of Si. This makes highly tensile strained Ge a most promising material for the construction of channels in CMOS devices, as well as for Si-based photonic applications. Biaxial (001) strain achieves mobility enhancements of 100 to 1000 with strains over 2%. Low temperature mobility can be increased by even larger factors. Second order terms in the deformation potential of the Gamma valley are found to be important in this mobility enhancement. Although they are modified by shifts in the conduction band valleys, which are caused by carrier quantum confinement, these mobility enhancements persist in strained nanostructures down to sizes of 20 nm.

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First-principles electronic structure methods are used to find the rates of inelastic intravalley and intervalley n-type carrier scattering in Si1-xGex alloys. Scattering parameters for all relevant Delta and L intra- and intervalley scattering are calculated. The short-wavelength acoustic and the optical phonon modes in the alloy are computed using the random mass approximation, with interatomic forces calculated in the virtual crystal approximation using density functional perturbation theory. Optical phonon and intervalley scattering matrix elements are calculated from these modes of the disordered alloy. It is found that alloy disorder has only a small effect on the overall inelastic intervalley scattering rate at room temperature. Intravalley acoustic scattering rates are calculated within the deformation potential approximation. The acoustic deformation potentials are found directly and the range of validity of the deformation potential approximation verified in long-wavelength frozen phonon calculations. Details of the calculation of elastic alloy scattering rates presented in an earlier paper are also given. Elastic alloy disorder scattering is found to dominate over inelastic scattering, except for almost pure silicon (x approximate to 0) or almost pure germanium (x approximate to 1), where acoustic phonon scattering is predominant. The n-type carrier mobility, calculated from the total (elastic plus inelastic) scattering rate, using the Boltzmann transport equation in the relaxation time approximation, is in excellent agreement with experiments on bulk, unstrained alloys..

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Modification of TiO2 with metal oxide nanoclusters such as FeOx, NiOx has been shown to be a promising approach to the design of new photocatalysts with visible light absorption and improved electron–hole separation. To study further the factors that determine the photocatalytic properties of structures of this type, we present in this paper a first principles density functional theory (DFT) investigation of TiO2 rutile(110) and anatase(001) modified with PbO and PbO2 nanoclusters, with Pb2+ and Pb4+ oxidation states. This allows us to unravel the effect of the Pb oxidation state on the photocatalytic properties of PbOx-modified TiO2. The nanoclusters adsorb strongly at all TiO2 surfaces, creating new Pb–O and Ti–O interfacial bonds. Modification with PbO and PbO2 nanoclusters introduces new states in the original band gap of rutile and anatase. However the oxidation state of Pb has a dramatic impact on the nature of the modifications of the band edges of TiO2 and on the electron–hole separation mechanism. PbO nanocluster modification leads to an upwards shift of the valence band which reduces the band gap and upon photoexcitation results in hole localisation on the PbO nanocluster and electron localisation on the surface. By contrast, for PbO2 nanocluster modification the hole will be localised on the TiO2 surface and the electron on the nanocluster, thus giving rise to two different band gap reduction and electron–hole separation mechanisms. We find no crystal structure sensitivity, with both rutile and anatase surfaces showing similar properties upon modification with PbOx. In summary the photocatalytic properties of heterostructures of TiO2 with oxide nanoclusters can be tuned by oxidation state of the modifying metal oxide, with the possibility of a reduced band gap causing visible light activation and a reduction in charge carrier recombination.

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With increasing prevalence and capabilities of autonomous systems as part of complex heterogeneous manned-unmanned environments (HMUEs), an important consideration is the impact of the introduction of automation on the optimal assignment of human personnel. The US Navy has implemented optimal staffing techniques before in the 1990's and 2000's with a "minimal staffing" approach. The results were poor, leading to the degradation of Naval preparedness. Clearly, another approach to determining optimal staffing is necessary. To this end, the goal of this research is to develop human performance models for use in determining optimal manning of HMUEs. The human performance models are developed using an agent-based simulation of the aircraft carrier flight deck, a representative safety-critical HMUE. The Personnel Multi-Agent Safety and Control Simulation (PMASCS) simulates and analyzes the effects of introducing generalized maintenance crew skill sets and accelerated failure repair times on the overall performance and safety of the carrier flight deck. A behavioral model of four operator types (ordnance officers, chocks and chains, fueling officers, plane captains, and maintenance operators) is presented here along with an aircraft failure model. The main focus of this work is on the maintenance operators and aircraft failure modeling, since they have a direct impact on total launch time, a primary metric for carrier deck performance. With PMASCS I explore the effects of two variables on total launch time of 22 aircraft: 1) skill level of maintenance operators and 2) aircraft failure repair times while on the catapult (referred to as Phase 4 repair times). It is found that neither introducing a generic skill set to maintenance crews nor introducing a technology to accelerate Phase 4 aircraft repair times improves the average total launch time of 22 aircraft. An optimal manning level of 3 maintenance crews is found under all conditions, the point at which any additional maintenance crews does not reduce the total launch time. An additional discussion is included about how these results change if the operations are relieved of the bottleneck of installing the holdback bar at launch time.