Electric power plays a very important role in economic development and people's life and production, and 10kV distribution network project is the main way to improve the power system.In this paper, the current sit...Electric power plays a very important role in economic development and people's life and production, and 10kV distribution network project is the main way to improve the power system.In this paper, the current situation of construction management of 10kV distribution network project is mainly analyzed, and the quality control measures are put forward.展开更多
This paper presents a fully customised integrated gate commutated thyristor(IGCT)gate driver monolithic integrated circuit(GDMIC),aiming to address the many shortcomings of traditional IGCT gate driver units composed ...This paper presents a fully customised integrated gate commutated thyristor(IGCT)gate driver monolithic integrated circuit(GDMIC),aiming to address the many shortcomings of traditional IGCT gate driver units composed of discrete components,such as the excessive number of components,low reliability,and complex development processes.The current-source driving characteristics of IGCTs pose significant technical challenges for developing fully customised integrated circuits(IC).The customised requirements of IGCT gate driver chips under various operating conditions are explored regarding functional module division,power sequencing,and chip parameter specifications.However,existing high-side(HS)driver methods exhibit limitations in functional monolithic integration and bipolar complementary metal-oxide-semiconductor compat-ibility.To address these challenges,a novel HS driving topology based on floating linear regulators is proposed.It can achieve synchronised control of multi-channel floating power transistors while supporting 100%duty cycle continuous conduction.The pro-posed GDMIC reduces the three independent HS power supplies to a single multiplexed topology,significantly decreasing circuit complexity.Experimental results validate the feasibility and performance of a 4-inch gate driver prototype based on IGCT current-source management IC,demonstrating significant advantages in reducing the number of components,enhancing device reliability,and simplifying development.The proposed GDMIC offers an innovative development path for future high-power IGCT drivers.展开更多
Background： The emergency department （ED） has a pivotal influence on the management of acute heart failure （AHF）, but dataconcerning current ED management are scarce. This Beijing AHF Registry Study investigated ...Background： The emergency department （ED） has a pivotal influence on the management of acute heart failure （AHF）, but dataconcerning current ED management are scarce. This Beijing AHF Registry Study investigated the characteristics. ED management, and short- and long-term clinical outcomes of AHF. Methods： This prospective, multicenter, observational study consecutively enrolled 3335 AHF patients who visited 14 EDs in Beijing from January 1, 2011, to September 23, 2012. Baseline data on characteristics and management were collected in the EDs. Follow-up data on death and readmissions were collected until November 31, 2013, with a response rate of 92.80%. The data were reported as median （interquartile range） for the continuous variables, or as number （percentage） for the categorical variables. Results： The median age of the enrolled patients was 71 （58 79） years, and 46.84% wvere women. In patients with AHH coronary heart disease （43.27%） was the most common etiology, andmyocardium ischemia （30.22%） was the main precipitant. Most of the patients in the ED received intravenous treatments, including diuretics （79.28%） and vasodilators （74.90%）. Fewer patients in the ED received neurohormonal antagonists, and 25.94%, 31.12%, and 33.73% of patients received angiotensin converting enzyme inhibitors/angiotensin receptor blockers, beta-blockers, and spironolactone, respectively. The proportions of patients who were admitted, discharged, left against medical advice, and died were 55.53%, 33.58%, 7.08%, and 3.81%, respectively. All-cause mortalities at 30 days and 1 year were 15.30% and 32.27%, respectively. Conclusions： Substantial details on characteristics and ED management of AHF were investigated. The clinical outcomes of AHF patients were dismal. Thus, further investigations of ED-based therapeutic approaches for AHF are needed.展开更多
CHINA FOREX:What are the priorities for the Current Account Management Department in 2025?LIU Bin:As China continues to deepen its global integration,cross-border economic activities and personnel exchanges have signi...CHINA FOREX:What are the priorities for the Current Account Management Department in 2025?LIU Bin:As China continues to deepen its global integration,cross-border economic activities and personnel exchanges have significantly intensified.The Current Account Management Department remains committed to its public service mandate,enhancing fund settlement efficiency while ensuring compliant foreign exchange services for businesses and individuals.展开更多
文摘Electric power plays a very important role in economic development and people's life and production, and 10kV distribution network project is the main way to improve the power system.In this paper, the current situation of construction management of 10kV distribution network project is mainly analyzed, and the quality control measures are put forward.
基金National Key Research and Development Program of China,Grant/Award Number:2021YFB2401604The Integration Projects of National Natural Science Foundation of China-State Grid Joint Fund for Smart Grid,Grant/Award Number:U2166602National Natural Science Foundation of China,Grant/Award Number:52241701。
文摘This paper presents a fully customised integrated gate commutated thyristor(IGCT)gate driver monolithic integrated circuit(GDMIC),aiming to address the many shortcomings of traditional IGCT gate driver units composed of discrete components,such as the excessive number of components,low reliability,and complex development processes.The current-source driving characteristics of IGCTs pose significant technical challenges for developing fully customised integrated circuits(IC).The customised requirements of IGCT gate driver chips under various operating conditions are explored regarding functional module division,power sequencing,and chip parameter specifications.However,existing high-side(HS)driver methods exhibit limitations in functional monolithic integration and bipolar complementary metal-oxide-semiconductor compat-ibility.To address these challenges,a novel HS driving topology based on floating linear regulators is proposed.It can achieve synchronised control of multi-channel floating power transistors while supporting 100%duty cycle continuous conduction.The pro-posed GDMIC reduces the three independent HS power supplies to a single multiplexed topology,significantly decreasing circuit complexity.Experimental results validate the feasibility and performance of a 4-inch gate driver prototype based on IGCT current-source management IC,demonstrating significant advantages in reducing the number of components,enhancing device reliability,and simplifying development.The proposed GDMIC offers an innovative development path for future high-power IGCT drivers.
文摘Background： The emergency department （ED） has a pivotal influence on the management of acute heart failure （AHF）, but dataconcerning current ED management are scarce. This Beijing AHF Registry Study investigated the characteristics. ED management, and short- and long-term clinical outcomes of AHF. Methods： This prospective, multicenter, observational study consecutively enrolled 3335 AHF patients who visited 14 EDs in Beijing from January 1, 2011, to September 23, 2012. Baseline data on characteristics and management were collected in the EDs. Follow-up data on death and readmissions were collected until November 31, 2013, with a response rate of 92.80%. The data were reported as median （interquartile range） for the continuous variables, or as number （percentage） for the categorical variables. Results： The median age of the enrolled patients was 71 （58 79） years, and 46.84% wvere women. In patients with AHH coronary heart disease （43.27%） was the most common etiology, andmyocardium ischemia （30.22%） was the main precipitant. Most of the patients in the ED received intravenous treatments, including diuretics （79.28%） and vasodilators （74.90%）. Fewer patients in the ED received neurohormonal antagonists, and 25.94%, 31.12%, and 33.73% of patients received angiotensin converting enzyme inhibitors/angiotensin receptor blockers, beta-blockers, and spironolactone, respectively. The proportions of patients who were admitted, discharged, left against medical advice, and died were 55.53%, 33.58%, 7.08%, and 3.81%, respectively. All-cause mortalities at 30 days and 1 year were 15.30% and 32.27%, respectively. Conclusions： Substantial details on characteristics and ED management of AHF were investigated. The clinical outcomes of AHF patients were dismal. Thus, further investigations of ED-based therapeutic approaches for AHF are needed.
文摘CHINA FOREX:What are the priorities for the Current Account Management Department in 2025?LIU Bin:As China continues to deepen its global integration,cross-border economic activities and personnel exchanges have significantly intensified.The Current Account Management Department remains committed to its public service mandate,enhancing fund settlement efficiency while ensuring compliant foreign exchange services for businesses and individuals.
