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The physical design of cavity and magnetron injection gun (MIG) for a realistic, DEMO-compatible, coaxial-cavity 238 GHz 2 MW CW fusion gyrotron is developed in this work, having auxiliary frequencies at 170 GHz and 204 GHz. Novel systematic approaches towards multi-frequency mode selection, magnet requirements, and MIG design are presented. Mode deterioration and voltage depression variation due to insert misalignment versus cavity wall and/or versus electron beam are studied.
koaxialer Innenleiter --- misalignment --- coaxial insert --- nuclear fusion --- Kernfusiongyrotron --- Versatz --- Mehrfrequenz-Gyrotron --- Gyrotron --- multifrequency gyrotron
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This paper studies the issue of real exchange rate misalignment and the difficulties in settling international real exchange rate disputes. The authors show theoretically that determining when a country should be sanctioned for real exchange rate "manipulations" is difficult: in some situations a country's real exchange rate targeting can be beneficial to other countries, while in others it is not. Regardless, it is difficult to establish whether a misaligned real exchange rate is intentionally manipulated rather than unintentionally caused by other policies or by various distortions in the economy. The paper continues by illustrating the difficulty in measuring real exchange rate misalignment, and provides a critical assessment of existing methodologies. It concludes by proposing a new method for measuring real exchange rate misalignment based on differences in marginal products between producers of tradable and non-tradable goods.
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There is a renewed debate on the role of exchange rate policies as an industrial policy tool in both academic and policy circles. Policy practitioners usually examine real exchange rate misalignments to monitor the behavior of this key relative price and, if possible, exploit distortions in the traded and non-traded relative price to promote growth. Anecdotal evidence shows that some countries have pursued very active exchange rate policies to promote the export sector and enhance growth by undervaluing their currencies. The main goal of this paper is to provide a systematic characterization of real exchange rate undervaluations. The long-run real exchange rate equation is estimated using: (a) Johansen time series cointegration estimates, and (b) pooled mean group estimates for non-stationary panel data. The paper constructs a dataset of real undervaluation episodes. It first evaluates whether (and if so, to what extent) economic policies can be used to either cause or sustain real undervaluations. In this context the paper empirically models the likelihood and magnitude of sustaining real exchange rate undervaluations by examining their link to policy instruments (such as exchange rate regimes and capital controls, among other policies) using probit and Tobit models. Finally, it investigates whether foreign exchange intervention can generate persistent real exchange rate deviations from equilibrium. In general, it finds that intervention can lead to greater persistence in the incidence and magnitude of real exchange rate undervaluations.
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There is a renewed debate on the role of exchange rate policies as an industrial policy tool in both academic and policy circles. Policy practitioners usually examine real exchange rate misalignments to monitor the behavior of this key relative price and, if possible, exploit distortions in the traded and non-traded relative price to promote growth. Anecdotal evidence shows that some countries have pursued very active exchange rate policies to promote the export sector and enhance growth by undervaluing their currencies. The main goal of this paper is to provide a systematic characterization of real exchange rate undervaluations. The long-run real exchange rate equation is estimated using: (a) Johansen time series cointegration estimates, and (b) pooled mean group estimates for non-stationary panel data. The paper constructs a dataset of real undervaluation episodes. It first evaluates whether (and if so, to what extent) economic policies can be used to either cause or sustain real undervaluations. In this context the paper empirically models the likelihood and magnitude of sustaining real exchange rate undervaluations by examining their link to policy instruments (such as exchange rate regimes and capital controls, among other policies) using probit and Tobit models. Finally, it investigates whether foreign exchange intervention can generate persistent real exchange rate deviations from equilibrium. In general, it finds that intervention can lead to greater persistence in the incidence and magnitude of real exchange rate undervaluations.
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This paper studies the issue of real exchange rate misalignment and the difficulties in settling international real exchange rate disputes. The authors show theoretically that determining when a country should be sanctioned for real exchange rate "manipulations" is difficult: in some situations a country's real exchange rate targeting can be beneficial to other countries, while in others it is not. Regardless, it is difficult to establish whether a misaligned real exchange rate is intentionally manipulated rather than unintentionally caused by other policies or by various distortions in the economy. The paper continues by illustrating the difficulty in measuring real exchange rate misalignment, and provides a critical assessment of existing methodologies. It concludes by proposing a new method for measuring real exchange rate misalignment based on differences in marginal products between producers of tradable and non-tradable goods.
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This paper models empirically the short and long-term behavior of the real exchange rate misalignment-a key variable in academic and policy circles. The equilibrium real exchange rate is derived from a theoretical model with intertemporal external equilibrium and internal equilibrium (in traded and non-traded markets) based on the current account dynamics and Harrod-Balassa-Samuelson productivity, respectively. This provides a bridge between theory and empirics that links the real exchange rate and its fundamentals (terms of trade, the ratio of net foreign assets to gross domestic product, and productivity differentials). The paper contributes to the literature by: (a) estimating an unrestricted vector error correction model that examines the short-term dynamics of real exchange rate misalignments and links these deviations with shocks to fundamentals from 1970 to 2010, and (b) computing the speed of reversion of real exchange rate misalignments with respect to a fundamentals-based equilibrium level. The paper reconciles two strands of the empirical literature that estimate the half-life of purchasing power parity deviations: one, the linear adjustment model that renders the consensus half-life estimates of purchasing power parity deviations, and another, the non-linear adjustment model of purchasing power parity deviations. The model estimates the half-life of real exchange rate deviations from their fundamental equilibrium at approximately 2.8 years. Consequently, about 25 percent of the real exchange rate deviation from its equilibrium level is corrected in the next year. Approximately 43 percent of the countries in the sample have a half-life of real exchange rate deviations from equilibrium less than 2.5 years-which is consistent with predictions from non-linear mean reversion models.
A Half-life --- An Unrestricted VECM --- Currencies and Exchange Rates --- Debt Markets --- Economic Stabilization --- Economic Theory & Research --- Fundamentals --- Macroeconomic Management --- Macroeconomics and Economic Growth --- Misalignment --- Poverty Reduction --- The HBS Effect
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Post-conflict countries receive substantial aid flows after the start of peace. While post-conflict countries' capacity to absorb aid (that is, the quality of their policies and institutions) is built up only gradually after the onset of peace, the evidence suggests that aid tends to peak immediately after peace is attained and decline thereafter. Aid composition broadly reflects post-conflict priorities, with large parts of aid financing social expenditure and infrastructure investment. Aid has significant short-term effects on the real exchange rate (RER), as inferred from the behavior of RER in the world. While moderate RER overvaluation is observed in post-conflicts, it cannot be traced down to the aid flows. The empirical evidence on world growth reveals new findings about the pattern of catch-up growth during post-conflicts and the role of key growth determinants on post-conflict growth. Aid is an important determinant of growth, both generally and more strongly during post-conflict periods. Because RER misalignment reduces growth, RER overvaluation during post-conflicts reduces catch-up growth. Aid and RER overvaluation combined also lower growth. But the negative growth effect of RER overvaluation declines with financial development.
Absorptive Capacities --- Assets --- Conflict and Development --- Currencies and Exchange Rates --- Current Account --- Debt Markets --- Depreciation --- Development Economics and Aid Effectiveness --- Domestic-Currency --- Dutch Disease --- Economic Conditions and Volatility --- Economic Growth --- Economic Theory and Research --- Economies --- Economy --- Emerging Markets --- Equilibrium --- Equilibrium Level --- Export Diversification --- Export Growth --- Finance and Financial Sector Development --- Macroeconomic Management --- Macroeconomics and Economic Growth --- Misalignment --- Overvaluation --- Post Conflict Reconstruction --- Poverty Reduction --- Private Sector Development --- Pro-Poor Growth --- Real Exchange Rate --- Real Exchange Rate Appreciation --- Real Exchange Rate Overvaluation --- Relative Price --- Risks --- Social Conflict and Violence --- Social Development
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Due to the increasing demand for security and reliability in manufacturing and mechatronic systems, early detection and diagnosis of faults are key points to reduce economic losses caused by unscheduled maintenance and downtimes, to increase safety, to prevent the endangerment of human beings involved in the process operations and to improve reliability and availability of autonomous systems. The development of algorithms for health monitoring and fault and anomaly detection, capable of the early detection, isolation, or even prediction of technical component malfunctioning, is becoming more and more crucial in this context. This Special Issue is devoted to new research efforts and results concerning recent advances and challenges in the application of “Algorithms for Fault Detection and Diagnosis”, articulated over a wide range of sectors. The aim is to provide a collection of some of the current state-of-the-art algorithms within this context, together with new advanced theoretical solutions.
History of engineering & technology --- structural health monitoring --- digital image processing --- damage --- gray level co-occurrence matrix --- self-organization map --- rolling bearings --- fault diagnosis --- multiscale entropy --- amplitude-aware permutation entropy --- random forest --- reusable launch vehicle --- thruster valve failure --- thruster fault detection --- Kalman filter --- machine vision --- machine diagnostics --- instantaneous angular speed --- SURVISHNO 2019 challenge --- video tachometer --- motion tracking --- edge detection --- parametric template modeling --- adaptive template matching --- genetic algorithm --- misalignment --- fault prediction --- combined prediction --- multivariate grey model --- quantum genetic algorithm --- least squares support vector machine --- lithium-ion battery --- battery faults --- battery safety --- battery management system --- fault diagnostic algorithms
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Condition monitoring of machinery is one of the most important aspects of many modern industries. With the rapid advancement of science and technology, machines are becoming increasingly complex. Moreover, an exponential increase of demand is leading an increasing requirement of machine output. As a result, in most modern industries, machines have to work for 24 hours a day. All these factors are leading to the deterioration of machine health in a higher rate than before. Breakdown of the key components of a machine such as bearing, gearbox or rollers can cause a catastrophic effect both in terms of financial and human costs. In this perspective, it is important not only to detect the fault at its earliest point of inception but necessary to design the overall monitoring process, such as fault classification, fault severity assessment and remaining useful life (RUL) prediction for better planning of the maintenance schedule. Information theory is one of the pioneer contributions of modern science that has evolved into various forms and algorithms over time. Due to its ability to address the non-linearity and non-stationarity of machine health deterioration, it has become a popular choice among researchers. Information theory is an effective technique for extracting features of machines under different health conditions. In this context, this book discusses the potential applications, research results and latest developments of information theory-based condition monitoring of machineries.
Technology: general issues --- History of engineering & technology --- fault detection --- deep learning --- transfer learning --- anomaly detection --- bearing --- wind turbines --- misalignment --- fault diagnosis --- information fusion --- improved artificial bee colony algorithm --- LSSVM --- D–S evidence theory --- optimal bandwidth --- kernel density estimation --- JS divergence --- domain adaptation --- partial transfer --- subdomain --- rotating machinery --- gearbox --- signal interception --- peak extraction --- cubic spline interpolation envelope --- combined fault diagnosis --- empirical wavelet transform --- grey wolf optimizer --- low pass FIR filter --- support vector machine --- satellite momentum wheel --- Huffman-multi-scale entropy (HMSE) --- support vector machine (SVM) --- adaptive particle swarm optimization (APSO) --- rail surface defect detection --- machine vision --- YOLOv4 --- MobileNetV3 --- multi-source heterogeneous fusion --- n/a --- D-S evidence theory
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Post-conflict countries receive substantial aid flows after the start of peace. While post-conflict countries' capacity to absorb aid (that is, the quality of their policies and institutions) is built up only gradually after the onset of peace, the evidence suggests that aid tends to peak immediately after peace is attained and decline thereafter. Aid composition broadly reflects post-conflict priorities, with large parts of aid financing social expenditure and infrastructure investment. Aid has significant short-term effects on the real exchange rate (RER), as inferred from the behavior of RER in the world. While moderate RER overvaluation is observed in post-conflicts, it cannot be traced down to the aid flows. The empirical evidence on world growth reveals new findings about the pattern of catch-up growth during post-conflicts and the role of key growth determinants on post-conflict growth. Aid is an important determinant of growth, both generally and more strongly during post-conflict periods. Because RER misalignment reduces growth, RER overvaluation during post-conflicts reduces catch-up growth. Aid and RER overvaluation combined also lower growth. But the negative growth effect of RER overvaluation declines with financial development.
Absorptive Capacities --- Assets --- Conflict and Development --- Currencies and Exchange Rates --- Current Account --- Debt Markets --- Depreciation --- Development Economics and Aid Effectiveness --- Domestic-Currency --- Dutch Disease --- Economic Conditions and Volatility --- Economic Growth --- Economic Theory and Research --- Economies --- Economy --- Emerging Markets --- Equilibrium --- Equilibrium Level --- Export Diversification --- Export Growth --- Finance and Financial Sector Development --- Macroeconomic Management --- Macroeconomics and Economic Growth --- Misalignment --- Overvaluation --- Post Conflict Reconstruction --- Poverty Reduction --- Private Sector Development --- Pro-Poor Growth --- Real Exchange Rate --- Real Exchange Rate Appreciation --- Real Exchange Rate Overvaluation --- Relative Price --- Risks --- Social Conflict and Violence --- Social Development
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