Local and central governments are concerned to develop fiscal policies that are based on principles already enshrined in the literature as the principle of equity and/or the principle of fiscal appropriateness. Beyond...Local and central governments are concerned to develop fiscal policies that are based on principles already enshrined in the literature as the principle of equity and/or the principle of fiscal appropriateness. Beyond these principles, the governments want to make sure that all taxpayers have the capacity to pay at maturity the tax debts owed to the public budget. In crisis situations, as recent experience has shown, governments adopt fiscal policy measures, with the sole purpose of procuring financial resources to cover the huge government budget deficits. In this situation, a natural question arises： Do governments need, for the elaboration of their fiscal policy, an analysis that takes into account the taxpayer＇s budget？ Or is it sufficient that they confine only to the theoretical principles enshrined in the literature or the tax paying ability of the taxpayers？ The answer can only be affirmative, because any taxpayer＇s budget is an inexhaustible source of resources for the public budgets. It is undisputed that in the taxpayer＇s budget, the tax expenditures coexist with other categories of expenditures such as consumption expenditures, durable expenditures and public utilities expenditures. Each expenditure type is risk-bearing. To study the structure of budget expenditures within the taxpayer, the authors suggest the use of three indicators innovative for the science of public finance： the risk, the sensitivity coefficient and the coefficient of volatility. Depending on the values registered by the three indicators of fiscal policies, expenditures can be classified as risky, volatile and sensitive which may lead to risks of failure to collect the taxes and/or to tax evasion. Innovative for the science of public finances is that the fundamentation of the fiscal policies is realized using the three indicators, the budget of the taxpayer and the networking between the categories of expenditures that fall within its budget structure展开更多
The simulations of a heat wave occurring in southern Yangtze-Huaihe valley and southern China during late July,2003 were conducted to examine the sensitivity of simulated surface air temperature(SAT) to different land...The simulations of a heat wave occurring in southern Yangtze-Huaihe valley and southern China during late July,2003 were conducted to examine the sensitivity of simulated surface air temperature(SAT) to different land surface schemes(LSSs) using the Weather Research and Forecasting Model(WRF) Version 2.2 in the short-range mode for 24-h integrations.Initial and boundary conditions employed a National Centers for Environmental Prediction(NCEP) analysis.The results showed that,overall,simulated high-temperature weather is sensitive to different LSSs.Large differences in simulated SAT intensity,threat score,and simulated error under different schemes are identified clearly.In addition,some systematic differences are also in-duced by the LSSs.In terms of threat score from the three LSSs,SLAB is the best,and RUC is better than NOAH.SLAB gives the lowest absolute error for area-averaged SAT,and tends to depict the western Pacific subtropical high with the east-ernmost position at low levels.The LSSs modify the simulated SAT,primarily via the transfer of sensible heat from the land surface to the atmosphere.The physical mechanism of the positive feedback between atmospheric circulation and the SAT is unimportant,with"negative"feedback over most of the simulated areas.This study emphasizes the importance of improving LSSs in SAT forecasting by numerical models.展开更多
The Rydberg states of neutral atoms are strongly polarisable and possess long lifetimes because of high energies which can lead to strong and long range dipole-dipole interactions.The energy levels corresponding to th...The Rydberg states of neutral atoms are strongly polarisable and possess long lifetimes because of high energies which can lead to strong and long range dipole-dipole interactions.The energy levels corresponding to these states are shifted because of dipole-dipole interactions and can be used to block transitions of more than one excitation in the Rydberg regime.This reputed Rydberg blockade is obtained when the excitation is shifted out of resonance by these interactions.Electromagnetically induced transparency(EIT)is sensitive to a small detuning.At large distances,up to several micrometers,the interactions can interrupt the EIT consequence.Herein we investigate a novel scheme based on EIT and Rydberg blockade and performed a simulation of a controlled-NOT(C-NOT)quantum gate which is critical for quantum computation by using neutral atoms.展开更多
文摘Local and central governments are concerned to develop fiscal policies that are based on principles already enshrined in the literature as the principle of equity and/or the principle of fiscal appropriateness. Beyond these principles, the governments want to make sure that all taxpayers have the capacity to pay at maturity the tax debts owed to the public budget. In crisis situations, as recent experience has shown, governments adopt fiscal policy measures, with the sole purpose of procuring financial resources to cover the huge government budget deficits. In this situation, a natural question arises： Do governments need, for the elaboration of their fiscal policy, an analysis that takes into account the taxpayer＇s budget？ Or is it sufficient that they confine only to the theoretical principles enshrined in the literature or the tax paying ability of the taxpayers？ The answer can only be affirmative, because any taxpayer＇s budget is an inexhaustible source of resources for the public budgets. It is undisputed that in the taxpayer＇s budget, the tax expenditures coexist with other categories of expenditures such as consumption expenditures, durable expenditures and public utilities expenditures. Each expenditure type is risk-bearing. To study the structure of budget expenditures within the taxpayer, the authors suggest the use of three indicators innovative for the science of public finance： the risk, the sensitivity coefficient and the coefficient of volatility. Depending on the values registered by the three indicators of fiscal policies, expenditures can be classified as risky, volatile and sensitive which may lead to risks of failure to collect the taxes and/or to tax evasion. Innovative for the science of public finances is that the fundamentation of the fiscal policies is realized using the three indicators, the budget of the taxpayer and the networking between the categories of expenditures that fall within its budget structure
基金supported by National Natural Science Foundation of China(Grant No.40875067)part by Knowledge Innovation Program of the Chinese Academy of Sciences(Grant No.IAP09306)
文摘The simulations of a heat wave occurring in southern Yangtze-Huaihe valley and southern China during late July,2003 were conducted to examine the sensitivity of simulated surface air temperature(SAT) to different land surface schemes(LSSs) using the Weather Research and Forecasting Model(WRF) Version 2.2 in the short-range mode for 24-h integrations.Initial and boundary conditions employed a National Centers for Environmental Prediction(NCEP) analysis.The results showed that,overall,simulated high-temperature weather is sensitive to different LSSs.Large differences in simulated SAT intensity,threat score,and simulated error under different schemes are identified clearly.In addition,some systematic differences are also in-duced by the LSSs.In terms of threat score from the three LSSs,SLAB is the best,and RUC is better than NOAH.SLAB gives the lowest absolute error for area-averaged SAT,and tends to depict the western Pacific subtropical high with the east-ernmost position at low levels.The LSSs modify the simulated SAT,primarily via the transfer of sensible heat from the land surface to the atmosphere.The physical mechanism of the positive feedback between atmospheric circulation and the SAT is unimportant,with"negative"feedback over most of the simulated areas.This study emphasizes the importance of improving LSSs in SAT forecasting by numerical models.
基金the Higher Education Commission (HEC) of Pakistan for providing financial support
文摘The Rydberg states of neutral atoms are strongly polarisable and possess long lifetimes because of high energies which can lead to strong and long range dipole-dipole interactions.The energy levels corresponding to these states are shifted because of dipole-dipole interactions and can be used to block transitions of more than one excitation in the Rydberg regime.This reputed Rydberg blockade is obtained when the excitation is shifted out of resonance by these interactions.Electromagnetically induced transparency(EIT)is sensitive to a small detuning.At large distances,up to several micrometers,the interactions can interrupt the EIT consequence.Herein we investigate a novel scheme based on EIT and Rydberg blockade and performed a simulation of a controlled-NOT(C-NOT)quantum gate which is critical for quantum computation by using neutral atoms.
