BACKGROUND：On July 21, 2009, the Medical Council of India officially recognized the specialty of emergency medicine in India. The city of Chennai with over six and a half million people is the fourth largest on the s...BACKGROUND：On July 21, 2009, the Medical Council of India officially recognized the specialty of emergency medicine in India. The city of Chennai with over six and a half million people is the fourth largest on the subcontinent and has already been a prominent city of interest in the specialty＇s development. However, there is no standardization of the resources found in the city＇s emergency departments. This study was to survey the equipment, training, and certification of Chennai area emergency departments and their staff. METHODS：We conducted a cross-sectional survey of emergency department staff from 38 Chennai area hospitals. The survey instrument contained 44 questions pertaining to hospital demographics, staff training and certification, and ED equipment and supplies. The items on the survey were specifically chosen to represent only the most basic and common resources necessary to practise emergency medicine. RESULTS： The survey found a majority of hospitals are privately operated but there is a wide range in terms of size and volume of patients. A minority of both doctors and nurses are certified in BLS, ACLS, PALS, and ATLS. While almost all departments surveyed had the basic code medications, a number of basic equipment items were lacking from a large percentage of the EDs surveyed. CONCLUSION：The newly established EP community in Chennai will have the responsibility to establish standards for both training and resources so that the specialty may grow and provide a higher standard of emergency care moving into the future.展开更多
Pangolins are currently considered the most endangered mammal species due to their high rank in local and international traffic. This species is protected in DRC and worldwide, unfortunately it is threatened by numero...Pangolins are currently considered the most endangered mammal species due to their high rank in local and international traffic. This species is protected in DRC and worldwide, unfortunately it is threatened by numerous human actions. The objective of this study is to identify the different reasons for which these animals are exploited, to provide information to determine from the opinions of the respondents the current state of the population from 2015 to today and to identify their hunting techniques by the local populations. We carried out surveys in the households of hunters, farmers and people practicing other professions in 12 villages, located within the RNT and surroundings areas. Two interview techniques were used: the individual interview and the participatory diagnostic technique. 175 people were interviewed individually. Nearly 97% of our respondents are motivated to consume pangolin as bush meat obtaining by hunting. The main reason for eating pangolin meat is 44% preference and 33% habit. The zone does not know the foreign solicitation of the exploitation of pangolins and its derivatives. The opinions of the population regarding the current state of pangolin in the Tayna Nature Reserve indicate that from 2015 to the present day the common pangolin “<em>Manis tricuspis</em>” has been abundant. Hunters use different hunting techniques, dominated by pickup for the <em>Manis tricuspis</em>, digging burrow, fire at the entrance of the burrow for <em>Manis gigantea</em> and the shotgun for the <em>Manis tetradactyla</em>.展开更多
China has many lakes, marshlands and rivers. Due to their uneven geographical distribution and varied degrees of salinity, their exploitable freshwater resources are limited. In the wake of the highspeed growth of nat...China has many lakes, marshlands and rivers. Due to their uneven geographical distribution and varied degrees of salinity, their exploitable freshwater resources are limited. In the wake of the highspeed growth of national economy in recent years, human infringement upon their natural settings has been increasingly intense, leading to the degeneration of China's lacustrine ecosystems and the degradation of their surrounding environments. Lakes are shrinking and becoming more saline. In arid and semi-arid inland areas, some of them have even disappeared. In addition, lake water pollution and eutrophication in densely populated areas are getting worse, resulting in serious water shortages in some places. Silt deposition in lake basins, water surface shrinkage caused by hectic and irrational reclamation for farmland, the prevalence of flooding and water-logging calamities and ecosystem depletion caused by predatory exploitation of fishery resources, all of these have become restrictive factors in regional sustainable development. The author of this article suggests measures for the protection and sustainable exploitation of limnetic settings in China.展开更多
Based on the review of the papers and other related material submitted to the conference, the status quo and developmental trends of geocryology is briefly discussed.
Central Asia is considered to be the primary center of origin and diversity for the genus Tulipa L. (Liliaceae). The article considers the species of rare and endemic Tulipa L. species in the arid regions of Uzbekista...Central Asia is considered to be the primary center of origin and diversity for the genus Tulipa L. (Liliaceae). The article considers the species of rare and endemic Tulipa L. species in the arid regions of Uzbekistan. There are nine registered species of the genus Tulipa. In the course of the study, the demographic indicators of the modern population of 39 populations were evaluated. 39 populations of the studied species were identified, most of which grow in the composition of the wormwood formations characteristic of the Turanian floristic province.展开更多
The current state of coenotic populations of rare and endangered species of Uzbekistan-Tulipa micheliana Hoog is given. Based on the analysis of demographic indicators and a number of organisms and population signs, t...The current state of coenotic populations of rare and endangered species of Uzbekistan-Tulipa micheliana Hoog is given. Based on the analysis of demographic indicators and a number of organisms and population signs, the state of the cenotic populations of the species was assessed, during the 2012-2018 years studied 15 cenopopulations different ecological-phytocenotic conditions in Uzbekistan.展开更多
The current state of coenotic populations of rare and endangered species of Uzbekistan Helichrysum maracandicum is given. The range of species distribution is broad. The article contains 12 cenopopulations of Helichry...The current state of coenotic populations of rare and endangered species of Uzbekistan Helichrysum maracandicum is given. The range of species distribution is broad. The article contains 12 cenopopulations of Helichrysum maracandicum in Uzbekistan, which have considerable healing properties. During the researches, no censorship marks were recorded in any cenopopulation. Approximately, 1, 5, 11 censorpopulations were found to be close to optimal conditions. This indicates that adequate amounts of precipitation in these areas throughout the year have a positive impact on the growth and development of the plant. Most of the cenopopulations were transmitted to younger and transient states.展开更多
Cytomegaloviral hepatitis is an infantile liver disease commonly encountered in China, which could be differentiated into 4 patterns with different clinical conditions. Along with the progress of laboratory diagnostic...Cytomegaloviral hepatitis is an infantile liver disease commonly encountered in China, which could be differentiated into 4 patterns with different clinical conditions. Along with the progress of laboratory diagnostic techniques, multiple diagnostic approaches are available for this disease, but accurate diagnosis can only be made when individual patients＇ realities are taken into consideration. Clinical treatments are various, and the Western medicine used is mainly anti-viral agents such as Ganciclovir, and so far no unified therapeutic program has been formed. More and more ways of regarding Chinese medicine treatment of cytomegaloviral hepatitis have been published increasingly in recent years, though further research to seek preferable treatment programs is still expected.展开更多
In this paper,we study some new fractional-order multi-agent systems with current and delay states (FMASCD).Using the generalized Nyquist's stability criterion and Gerschgorin's circle theorem,we obtain the bo...In this paper,we study some new fractional-order multi-agent systems with current and delay states (FMASCD).Using the generalized Nyquist's stability criterion and Gerschgorin's circle theorem,we obtain the bounded input-bounded output (BIBO) stability and asymptotical consensus of the FMASCD under mild conditions.Moreover,we give some numerical examples to illustrate our main results.展开更多
With a new approach,the general current expressions of two typical second order catalytic reactions at microelectrodes are obtained.This allows the study of fast chemical reactions and systems where the reactants are ...With a new approach,the general current expressions of two typical second order catalytic reactions at microelectrodes are obtained.This allows the study of fast chemical reactions and systems where the reactants are present in similar concentrations.展开更多
This paper studies two-dimensional analysis of the surface state effect on current gain for a 4H-SiC bipolar junction transistor （BJT）. Simulation results indicate the mechanism of current gain degradation, which is...This paper studies two-dimensional analysis of the surface state effect on current gain for a 4H-SiC bipolar junction transistor （BJT）. Simulation results indicate the mechanism of current gain degradation, which is surface Fermi level pinning leading to a strong downward bending of the energy bands to form the channel of surface electron recombination current. The experimental results are well-matched with the simulation, which is modeled by exponential distributions of the interface state density replacing the single interface state trap. Furthermore, the simulation reveals that the oxide quality of the base emitter junction interface is very important for 4H-SiC BJT performance.展开更多
The principle of minimum dissipation rate is applied to tokamak plasmas with energy and helicity balances imposed as two constraints. The analytical solution on toroidal current distribution are derived from the resul...The principle of minimum dissipation rate is applied to tokamak plasmas with energy and helicity balances imposed as two constraints. The analytical solution on toroidal current distribution are derived from the resulting Euler-Lagrangian equation. Three typical forms of current profiles are found for low-aspect-ratio tokamaks like NSTX. One of them decreases with r on equatorial plane, the second peaks in the inner half part on equatorial plane and the third may have a hole or reverse in the central part.展开更多
The low voltage substrate current （Ib） has been studied based on generation kinetics and used as a monitor of interface states （Nit） generation for ultra-thin oxide n-MOSFETs under constant voltage stress. It is f...The low voltage substrate current （Ib） has been studied based on generation kinetics and used as a monitor of interface states （Nit） generation for ultra-thin oxide n-MOSFETs under constant voltage stress. It is found that the low voltage Ib is formed by electrons tunnelling through interface states, and the variations of Ib（△Ib） are proportional to variations of Nit （△Nit）. The Nit energy distributions were determined by differentiating Nit（Vg）. The results have been compared with that measured by using gate diode technique.展开更多
Objective: To investigate the research hotspots and development trends of Chinese geriatric medicine by analyzing the high-frequency keywords, core authors, research institutions and their collaborations in papers pub...Objective: To investigate the research hotspots and development trends of Chinese geriatric medicine by analyzing the high-frequency keywords, core authors, research institutions and their collaborations in papers published in the Chinese Journal of Geriatrics.Methods: Bibliometric methods and information visualization software(CiteSpace Ⅲ) were used to analyze the following 3 aspects: keywords, institutions and authors.Results: Overall, the number of papers published in the Chinese Journal of Geriatrics grew between 1994 and 2015. The top 3 institutions with the greatest numbers of published papers were Beijing Hospital,People's Liberation Army General Hospital and the Second Xiangya Hospital of Central South University.The authors with high productivity were Pulin Yu, Jianye Wang and Xiaoying Li. The terms "Diabetes","hypertension" and "myocardial infarction" were hotspot words that drew sustained attention in this field.Conclusions: Research on geriatric medicine is growing steadily in China. Hospitals and teaching hospitals are major contributors to publications. The collaboration of authors is more common within the same institutions or in the same regions. Clinical research is still the focus of current research. In the future, basic research should be strengthened, and collaborations between different institutions and regions should be promoted to achieve coordinated and integrated development in Chinese geriatric medicine.展开更多
Because of the end effect, a linear induction motor （LIM） runs in an asymmetrical state even though the winding of each phase is symmetric. Based on the basic principle of the LIM, a new approach was proposed to cal...Because of the end effect, a linear induction motor （LIM） runs in an asymmetrical state even though the winding of each phase is symmetric. Based on the basic principle of the LIM, a new approach was proposed to calculate the thrust of the LIM using the instantaneous current value. A three-phase LIM model with 12 slots and a singlelayer winding was designed to validate this method. The experiments show that when the current is small, the calculated results basically agree with the experiments. The agreement becomes worse with the increase of the current because of the saturation of the primary iron core. The proposed formula is suitable when the iron core of the LIM primary is in an unsaturated state.展开更多
This paper investigates the behaviour of the reverse-bias leakage current of the Schottky diode with a thin Al inserting layer inserted between Al0.245Ga0.755N/GaN heterostructure and Ni/Au Schottky contact in the tem...This paper investigates the behaviour of the reverse-bias leakage current of the Schottky diode with a thin Al inserting layer inserted between Al0.245Ga0.755N/GaN heterostructure and Ni/Au Schottky contact in the temperature range of 25 350℃. It compares with the Schottky diode without Aluminium inserting layer. The experimental results show that in the Schottky diode with Al layer the minimum point of I-V curve drifts to the minus voltage, and with the increase of temperature increasing, the minimum point of I V curve returns the 0 point. The temperature dependence of gate-leakage currents in the novelty diode and the traditional diode are studied. The results show that the Al inserting layer introduces interface states between metal and Al0.245Ga0.755N. Aluminium reacted with oxygen formed Al2O3 insulator layer which suppresses the trap tunnelling current and the trend of thermionic field emission current. The reliability of the diode at the high temperature is improved by inserting a thin Al layer.展开更多
用于中高压直流电网互联和隔离的模块化多电平直流变压器(modular multilevel DC transformer,MMDCT)在传输功率变化的过程中会出现电流欠阻尼振荡的问题,从而降低了装置的稳定性,因此文中对振荡抑制展开了研究。首先,通过差模和共模电...用于中高压直流电网互联和隔离的模块化多电平直流变压器(modular multilevel DC transformer,MMDCT)在传输功率变化的过程中会出现电流欠阻尼振荡的问题,从而降低了装置的稳定性,因此文中对振荡抑制展开了研究。首先,通过差模和共模电路中的振荡现象分析,并基于状态空间平均法建立数学模型,从而揭示了MMDCT中的电流振荡机理;进一步提出了一种基于共模和差模分离的电流振荡抑制方法,利用变副边交流侧电压占空比的方式实现漏感电流振荡的抑制,同时采用变桥臂电压占空比的方式进行环流电流振荡的抑制,并给出了相应控制器参数设计依据。最后,通过仿真和实验验证了所提控制方法的有效性,结果表明在基于共模和差模分离的振荡抑制方法下,MMDCT可以在功率变化过程中快速实现电流稳定,有利于提升装置稳定性。展开更多
This paper presents a simple novel technique-forward gated-diode R-G current method-to determine the lateral lightly-doped source/drain (S/D) region interface state density and effective surface doping concentration o...This paper presents a simple novel technique-forward gated-diode R-G current method-to determine the lateral lightly-doped source/drain (S/D) region interface state density and effective surface doping concentration of the lightly-doped drain (LDD) N- MOSFET's simultaneously. One interesting result of the numerical analysis is the direct characterization of the interface state density and characteristic gate voltage values corresponding to LDD effective surface doping concentration. It is observed that the S/D N- surface doping concentration and corresponding region's interface state density are R-G current peak position and amplitude dependent, respectively. It is convincible that the proposed method is well suitable for the characterization of deep sub-micron MOSFET's in the current ULSI technology.展开更多
文摘BACKGROUND：On July 21, 2009, the Medical Council of India officially recognized the specialty of emergency medicine in India. The city of Chennai with over six and a half million people is the fourth largest on the subcontinent and has already been a prominent city of interest in the specialty＇s development. However, there is no standardization of the resources found in the city＇s emergency departments. This study was to survey the equipment, training, and certification of Chennai area emergency departments and their staff. METHODS：We conducted a cross-sectional survey of emergency department staff from 38 Chennai area hospitals. The survey instrument contained 44 questions pertaining to hospital demographics, staff training and certification, and ED equipment and supplies. The items on the survey were specifically chosen to represent only the most basic and common resources necessary to practise emergency medicine. RESULTS： The survey found a majority of hospitals are privately operated but there is a wide range in terms of size and volume of patients. A minority of both doctors and nurses are certified in BLS, ACLS, PALS, and ATLS. While almost all departments surveyed had the basic code medications, a number of basic equipment items were lacking from a large percentage of the EDs surveyed. CONCLUSION：The newly established EP community in Chennai will have the responsibility to establish standards for both training and resources so that the specialty may grow and provide a higher standard of emergency care moving into the future.
文摘Pangolins are currently considered the most endangered mammal species due to their high rank in local and international traffic. This species is protected in DRC and worldwide, unfortunately it is threatened by numerous human actions. The objective of this study is to identify the different reasons for which these animals are exploited, to provide information to determine from the opinions of the respondents the current state of the population from 2015 to today and to identify their hunting techniques by the local populations. We carried out surveys in the households of hunters, farmers and people practicing other professions in 12 villages, located within the RNT and surroundings areas. Two interview techniques were used: the individual interview and the participatory diagnostic technique. 175 people were interviewed individually. Nearly 97% of our respondents are motivated to consume pangolin as bush meat obtaining by hunting. The main reason for eating pangolin meat is 44% preference and 33% habit. The zone does not know the foreign solicitation of the exploitation of pangolins and its derivatives. The opinions of the population regarding the current state of pangolin in the Tayna Nature Reserve indicate that from 2015 to the present day the common pangolin “<em>Manis tricuspis</em>” has been abundant. Hunters use different hunting techniques, dominated by pickup for the <em>Manis tricuspis</em>, digging burrow, fire at the entrance of the burrow for <em>Manis gigantea</em> and the shotgun for the <em>Manis tetradactyla</em>.
文摘China has many lakes, marshlands and rivers. Due to their uneven geographical distribution and varied degrees of salinity, their exploitable freshwater resources are limited. In the wake of the highspeed growth of national economy in recent years, human infringement upon their natural settings has been increasingly intense, leading to the degeneration of China's lacustrine ecosystems and the degradation of their surrounding environments. Lakes are shrinking and becoming more saline. In arid and semi-arid inland areas, some of them have even disappeared. In addition, lake water pollution and eutrophication in densely populated areas are getting worse, resulting in serious water shortages in some places. Silt deposition in lake basins, water surface shrinkage caused by hectic and irrational reclamation for farmland, the prevalence of flooding and water-logging calamities and ecosystem depletion caused by predatory exploitation of fishery resources, all of these have become restrictive factors in regional sustainable development. The author of this article suggests measures for the protection and sustainable exploitation of limnetic settings in China.
文摘Based on the review of the papers and other related material submitted to the conference, the status quo and developmental trends of geocryology is briefly discussed.
文摘Central Asia is considered to be the primary center of origin and diversity for the genus Tulipa L. (Liliaceae). The article considers the species of rare and endemic Tulipa L. species in the arid regions of Uzbekistan. There are nine registered species of the genus Tulipa. In the course of the study, the demographic indicators of the modern population of 39 populations were evaluated. 39 populations of the studied species were identified, most of which grow in the composition of the wormwood formations characteristic of the Turanian floristic province.
文摘The current state of coenotic populations of rare and endangered species of Uzbekistan-Tulipa micheliana Hoog is given. Based on the analysis of demographic indicators and a number of organisms and population signs, the state of the cenotic populations of the species was assessed, during the 2012-2018 years studied 15 cenopopulations different ecological-phytocenotic conditions in Uzbekistan.
文摘The current state of coenotic populations of rare and endangered species of Uzbekistan Helichrysum maracandicum is given. The range of species distribution is broad. The article contains 12 cenopopulations of Helichrysum maracandicum in Uzbekistan, which have considerable healing properties. During the researches, no censorship marks were recorded in any cenopopulation. Approximately, 1, 5, 11 censorpopulations were found to be close to optimal conditions. This indicates that adequate amounts of precipitation in these areas throughout the year have a positive impact on the growth and development of the plant. Most of the cenopopulations were transmitted to younger and transient states.
基金Supported by Beijing Key Discipline(JJ2006-58)Chinese Medicine Scientific and Technologic Items of Beijing Traditional Chinese Medicine Administration
文摘Cytomegaloviral hepatitis is an infantile liver disease commonly encountered in China, which could be differentiated into 4 patterns with different clinical conditions. Along with the progress of laboratory diagnostic techniques, multiple diagnostic approaches are available for this disease, but accurate diagnosis can only be made when individual patients＇ realities are taken into consideration. Clinical treatments are various, and the Western medicine used is mainly anti-viral agents such as Ganciclovir, and so far no unified therapeutic program has been formed. More and more ways of regarding Chinese medicine treatment of cytomegaloviral hepatitis have been published increasingly in recent years, though further research to seek preferable treatment programs is still expected.
基金Project supported by the National Natural Science Foundation of China(Nos.11471230 and11671282)
文摘In this paper,we study some new fractional-order multi-agent systems with current and delay states (FMASCD).Using the generalized Nyquist's stability criterion and Gerschgorin's circle theorem,we obtain the bounded input-bounded output (BIBO) stability and asymptotical consensus of the FMASCD under mild conditions.Moreover,we give some numerical examples to illustrate our main results.
文摘With a new approach,the general current expressions of two typical second order catalytic reactions at microelectrodes are obtained.This allows the study of fast chemical reactions and systems where the reactants are present in similar concentrations.
文摘This paper studies two-dimensional analysis of the surface state effect on current gain for a 4H-SiC bipolar junction transistor （BJT）. Simulation results indicate the mechanism of current gain degradation, which is surface Fermi level pinning leading to a strong downward bending of the energy bands to form the channel of surface electron recombination current. The experimental results are well-matched with the simulation, which is modeled by exponential distributions of the interface state density replacing the single interface state trap. Furthermore, the simulation reveals that the oxide quality of the base emitter junction interface is very important for 4H-SiC BJT performance.
文摘The principle of minimum dissipation rate is applied to tokamak plasmas with energy and helicity balances imposed as two constraints. The analytical solution on toroidal current distribution are derived from the resulting Euler-Lagrangian equation. Three typical forms of current profiles are found for low-aspect-ratio tokamaks like NSTX. One of them decreases with r on equatorial plane, the second peaks in the inner half part on equatorial plane and the third may have a hole or reverse in the central part.
文摘The low voltage substrate current （Ib） has been studied based on generation kinetics and used as a monitor of interface states （Nit） generation for ultra-thin oxide n-MOSFETs under constant voltage stress. It is found that the low voltage Ib is formed by electrons tunnelling through interface states, and the variations of Ib（△Ib） are proportional to variations of Nit （△Nit）. The Nit energy distributions were determined by differentiating Nit（Vg）. The results have been compared with that measured by using gate diode technique.
基金supported and funded by the National Natural Science Foundation of China(No.71403155)supported by the Shanxi Federation of Social Science Circles(No.SSKLZDKT2014084)the Scientific and Technological Innovation Programs of Higher Education Institutions in Shanxi(No.2017SY043)
文摘Objective: To investigate the research hotspots and development trends of Chinese geriatric medicine by analyzing the high-frequency keywords, core authors, research institutions and their collaborations in papers published in the Chinese Journal of Geriatrics.Methods: Bibliometric methods and information visualization software(CiteSpace Ⅲ) were used to analyze the following 3 aspects: keywords, institutions and authors.Results: Overall, the number of papers published in the Chinese Journal of Geriatrics grew between 1994 and 2015. The top 3 institutions with the greatest numbers of published papers were Beijing Hospital,People's Liberation Army General Hospital and the Second Xiangya Hospital of Central South University.The authors with high productivity were Pulin Yu, Jianye Wang and Xiaoying Li. The terms "Diabetes","hypertension" and "myocardial infarction" were hotspot words that drew sustained attention in this field.Conclusions: Research on geriatric medicine is growing steadily in China. Hospitals and teaching hospitals are major contributors to publications. The collaboration of authors is more common within the same institutions or in the same regions. Clinical research is still the focus of current research. In the future, basic research should be strengthened, and collaborations between different institutions and regions should be promoted to achieve coordinated and integrated development in Chinese geriatric medicine.
基金supported by the National Natural Science Foundation of China (Nos. 50588201,50672078, and 50872116)the National Basic Research Program (973 program, No. 2007CB616906)+1 种基金the Australian Research Council (Grant No. DP0559872 and DP0881739)the PCSIRT of the Ministry of Education of China (No. IRT0751)
文摘Because of the end effect, a linear induction motor （LIM） runs in an asymmetrical state even though the winding of each phase is symmetric. Based on the basic principle of the LIM, a new approach was proposed to calculate the thrust of the LIM using the instantaneous current value. A three-phase LIM model with 12 slots and a singlelayer winding was designed to validate this method. The experiments show that when the current is small, the calculated results basically agree with the experiments. The agreement becomes worse with the increase of the current because of the saturation of the primary iron core. The proposed formula is suitable when the iron core of the LIM primary is in an unsaturated state.
文摘This paper investigates the behaviour of the reverse-bias leakage current of the Schottky diode with a thin Al inserting layer inserted between Al0.245Ga0.755N/GaN heterostructure and Ni/Au Schottky contact in the temperature range of 25 350℃. It compares with the Schottky diode without Aluminium inserting layer. The experimental results show that in the Schottky diode with Al layer the minimum point of I-V curve drifts to the minus voltage, and with the increase of temperature increasing, the minimum point of I V curve returns the 0 point. The temperature dependence of gate-leakage currents in the novelty diode and the traditional diode are studied. The results show that the Al inserting layer introduces interface states between metal and Al0.245Ga0.755N. Aluminium reacted with oxygen formed Al2O3 insulator layer which suppresses the trap tunnelling current and the trend of thermionic field emission current. The reliability of the diode at the high temperature is improved by inserting a thin Al layer.
文摘用于中高压直流电网互联和隔离的模块化多电平直流变压器(modular multilevel DC transformer,MMDCT)在传输功率变化的过程中会出现电流欠阻尼振荡的问题,从而降低了装置的稳定性,因此文中对振荡抑制展开了研究。首先,通过差模和共模电路中的振荡现象分析,并基于状态空间平均法建立数学模型,从而揭示了MMDCT中的电流振荡机理;进一步提出了一种基于共模和差模分离的电流振荡抑制方法,利用变副边交流侧电压占空比的方式实现漏感电流振荡的抑制,同时采用变桥臂电压占空比的方式进行环流电流振荡的抑制,并给出了相应控制器参数设计依据。最后,通过仿真和实验验证了所提控制方法的有效性,结果表明在基于共模和差模分离的振荡抑制方法下,MMDCT可以在功率变化过程中快速实现电流稳定,有利于提升装置稳定性。
基金Sponsored by Motorola CPTL(Contract No:MSPSDDLCHINA-0004)
文摘This paper presents a simple novel technique-forward gated-diode R-G current method-to determine the lateral lightly-doped source/drain (S/D) region interface state density and effective surface doping concentration of the lightly-doped drain (LDD) N- MOSFET's simultaneously. One interesting result of the numerical analysis is the direct characterization of the interface state density and characteristic gate voltage values corresponding to LDD effective surface doping concentration. It is observed that the S/D N- surface doping concentration and corresponding region's interface state density are R-G current peak position and amplitude dependent, respectively. It is convincible that the proposed method is well suitable for the characterization of deep sub-micron MOSFET's in the current ULSI technology.
