Chronic gastritis is a common disease mostfrequently occurring in persons over middle age.With the widespread use of the fibergastroscopicbiopsy technique,an increasing number ofchronic gastritis cases with gastric dy...Chronic gastritis is a common disease mostfrequently occurring in persons over middle age.With the widespread use of the fibergastroscopicbiopsy technique,an increasing number ofchronic gastritis cases with gastric dysplasia havebeen found.It is generally recognized that mo-derate and severe dysplasia are precancerouslesions.According to reports from展开更多
一、含有情态意味表示“在…范围(界限)内”“超出…范围(界限)”的介词结构往往含有情态动词can的意味。如: 1.The plane is still in sight.=The plane still can beseen. 2.The two canoes were almost out of sight.=The twocanoes ...一、含有情态意味表示“在…范围(界限)内”“超出…范围(界限)”的介词结构往往含有情态动词can的意味。如: 1.The plane is still in sight.=The plane still can beseen. 2.The two canoes were almost out of sight.=The twocanoes could hardly be seen. 3.The car is out of control.=The car can’t be con-trolled.展开更多
Ⅰ. INTRODUCTION Recently, a considerable progress has been made on the Monte Carlo simulation for X-ray quantitative mieroanalysis of particles with no correction for absorption. However, when the quantitative analys...Ⅰ. INTRODUCTION Recently, a considerable progress has been made on the Monte Carlo simulation for X-ray quantitative mieroanalysis of particles with no correction for absorption. However, when the quantitative analysis is performed on the particles of larger sizes with the X-ray photons of low energy, the absorption effects should be展开更多
INTRODUCTION In recent years, M. Y. Yu et al. have found two kinds of solitary waves with concave density profiles in a hot plasma under constant low-frequency magnetic field B, namely, Electrostatic Ion Cyclotron Sol...INTRODUCTION In recent years, M. Y. Yu et al. have found two kinds of solitary waves with concave density profiles in a hot plasma under constant low-frequency magnetic field B, namely, Electrostatic Ion Cyclotron Solitary Wave and Lower Hybrid Solitary Wave, under the assumption of quasi-neutrality.展开更多
Dynamic stable resonators (DSR) are resonators, from which the mode property of output laser will be insensitive to different perturbations in resonators. Chesler et al. (J. Appl. Phys., 43, (1972), 2254) are the firs...Dynamic stable resonators (DSR) are resonators, from which the mode property of output laser will be insensitive to different perturbations in resonators. Chesler et al. (J. Appl. Phys., 43, (1972), 2254) are the first to raise the prob-展开更多
The geometries of the non-linear triatomic molecules such as OH2, CH2 and NH2+ have been calculated by use of the basis sets STO-3G,4-31G and 9.5/3.1. The calculated bond distances are in reasonable agreement with exp...The geometries of the non-linear triatomic molecules such as OH2, CH2 and NH2+ have been calculated by use of the basis sets STO-3G,4-31G and 9.5/3.1. The calculated bond distances are in reasonable agreement with experimental results, having a maximum absolute error of 0.033A, corresponding to a percentage error of 3.8%. On the other hand, the calculated展开更多
In a grid-integrated photovoltaic system(GIPVS),there exist issues such as surplus active power and inadequate performance of maximum power point tracking(MPPT).A surplus active power causes the overvoltage problem at...In a grid-integrated photovoltaic system(GIPVS),there exist issues such as surplus active power and inadequate performance of maximum power point tracking(MPPT).A surplus active power causes the overvoltage problem at the point of common coupling in low-or medium-voltage grid during the peak hours of power generation.Additionally,the inadequate performance of the MPPT algorithm results in power loss due to high settling time during the sudden change of irradiance.Therefore,to solve the surplus power problem,the curtailment of active power is suggested with improved MPPT algorithm under variable irradiance conditions.In this paper,a derated power generation mode(DPGM)control strategy is presented for the curtailment of active power.Additionally,a drift-free(named as modified)perturb and observe(P&O)technique is also proposed to improve the performance of the MPPT algorithm.Consequently,the DPGM control scheme with the intermediate boost converter shaves the surplus active power during the peak hours of power generation.Furthermore,the modified MPPT algorithm deals with the fluctuation of irradiance during non-peak hours.Thus,the proposed control scheme delivers in a more efficient system during the peak hours of power generation.In addition,it reduces the power loss and settling time during the change of irradiance for non-peak hours.Based on the proposed control scheme,a 30 kW system has been simulated in MATLAB/Simulink using Simpower tools under different environmental conditions.展开更多
But the government remains the key factor in project progress. On one hand, the government equals the board of directors in state-owned enterprises. The government would approve whether the very projects are in confor...But the government remains the key factor in project progress. On one hand, the government equals the board of directors in state-owned enterprises. The government would approve whether the very projects are in conformity with the industrial展开更多
文摘Chronic gastritis is a common disease mostfrequently occurring in persons over middle age.With the widespread use of the fibergastroscopicbiopsy technique,an increasing number ofchronic gastritis cases with gastric dysplasia havebeen found.It is generally recognized that mo-derate and severe dysplasia are precancerouslesions.According to reports from
文摘一、含有情态意味表示“在…范围(界限)内”“超出…范围(界限)”的介词结构往往含有情态动词can的意味。如: 1.The plane is still in sight.=The plane still can beseen. 2.The two canoes were almost out of sight.=The twocanoes could hardly be seen. 3.The car is out of control.=The car can’t be con-trolled.
文摘Ⅰ. INTRODUCTION Recently, a considerable progress has been made on the Monte Carlo simulation for X-ray quantitative mieroanalysis of particles with no correction for absorption. However, when the quantitative analysis is performed on the particles of larger sizes with the X-ray photons of low energy, the absorption effects should be
文摘INTRODUCTION In recent years, M. Y. Yu et al. have found two kinds of solitary waves with concave density profiles in a hot plasma under constant low-frequency magnetic field B, namely, Electrostatic Ion Cyclotron Solitary Wave and Lower Hybrid Solitary Wave, under the assumption of quasi-neutrality.
文摘Dynamic stable resonators (DSR) are resonators, from which the mode property of output laser will be insensitive to different perturbations in resonators. Chesler et al. (J. Appl. Phys., 43, (1972), 2254) are the first to raise the prob-
文摘The geometries of the non-linear triatomic molecules such as OH2, CH2 and NH2+ have been calculated by use of the basis sets STO-3G,4-31G and 9.5/3.1. The calculated bond distances are in reasonable agreement with experimental results, having a maximum absolute error of 0.033A, corresponding to a percentage error of 3.8%. On the other hand, the calculated
基金This work was supported by the Department of Science and Technology(DST),India(No.DST/CERI/MI/SG/2017/080).
文摘In a grid-integrated photovoltaic system(GIPVS),there exist issues such as surplus active power and inadequate performance of maximum power point tracking(MPPT).A surplus active power causes the overvoltage problem at the point of common coupling in low-or medium-voltage grid during the peak hours of power generation.Additionally,the inadequate performance of the MPPT algorithm results in power loss due to high settling time during the sudden change of irradiance.Therefore,to solve the surplus power problem,the curtailment of active power is suggested with improved MPPT algorithm under variable irradiance conditions.In this paper,a derated power generation mode(DPGM)control strategy is presented for the curtailment of active power.Additionally,a drift-free(named as modified)perturb and observe(P&O)technique is also proposed to improve the performance of the MPPT algorithm.Consequently,the DPGM control scheme with the intermediate boost converter shaves the surplus active power during the peak hours of power generation.Furthermore,the modified MPPT algorithm deals with the fluctuation of irradiance during non-peak hours.Thus,the proposed control scheme delivers in a more efficient system during the peak hours of power generation.In addition,it reduces the power loss and settling time during the change of irradiance for non-peak hours.Based on the proposed control scheme,a 30 kW system has been simulated in MATLAB/Simulink using Simpower tools under different environmental conditions.
文摘But the government remains the key factor in project progress. On one hand, the government equals the board of directors in state-owned enterprises. The government would approve whether the very projects are in conformity with the industrial
