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具有自驱动有源缓冲器的GaN基高效准谐振反激式功率变换器

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半导体技术 2024年第3期49卷 263-271页

作者：王忠曹通王福学边国辉无锡职业技术学院汽车与交通学院江苏无锡214121 江南大学理学院江苏无锡214122 河北东森电子科技有限公司石家庄050200

提出了一种具有自驱动有源缓冲器的GaN基高效准谐振(QR)反激式功率变换器,以解决准谐振反激式功率变换器中开关管关断时电压过高的问题。电路以GaN高电子迁移率晶体管(HEMT)器件为主开关管和同步整流器开关管,自驱动有源缓冲器由钳位电... 详细信息

提出了一种具有自驱动有源缓冲器的GaN基高效准谐振(QR)反激式功率变换器,以解决准谐振反激式功率变换器中开关管关断时电压过高的问题。电路以GaN高电子迁移率晶体管(HEMT)器件为主开关管和同步整流器开关管,自驱动有源缓冲器由钳位电容和有源开关管组成。该变换器在主开关管关断期间将开关管的电压浪涌钳位为恒定电压,由于有源开关管驱动信号由变压器的次级侧电流控制,因此不需要单独的控制电路。为验证所提出的变换器和控制电路的有效性,搭建了一个60 W的AC-DC功率变换器,测试结果表明,主开关管的最大电压浪涌约为450 V,具有高达91.6%的能量转换效率。

关键词：反激式变换器电压浪涌自驱动有源缓冲器 GaN高电子迁移率晶体管(HEMT) DC-DC

大众传媒语境下日本体育竞技类型动画的现实性分析

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体育研究与教育 2024年第1期39卷 40-45页

作者：刘天豪曹桐南京师范大学文学院江苏南京210024

日本体育竞技类型动画作品种类繁多,长期的创作实践传递了培养集体主义精神、说服“唯体质论”、维持好胜心理的精神价值,也为日本社会营造良好的体育竞技风气做出了贡献。在大众传媒语境下,日本当代体育竞技类型动画在传统以知识氛围... 详细信息

日本体育竞技类型动画作品种类繁多,长期的创作实践传递了培养集体主义精神、说服“唯体质论”、维持好胜心理的精神价值,也为日本社会营造良好的体育竞技风气做出了贡献。在大众传媒语境下,日本当代体育竞技类型动画在传统以知识氛围普及为中心的功能之上,迎来了多元的现实性转型,相继出现了追求个人价值、矫正竞技道德、运动员偶像化的新作品;而与之相随的“类型裂变”使其现实性衰微,“体育”与“竞技”渐分道扬镳。

关键词：日本动画体育动画现实关照体育类型竞技

Hydraulic modeling and optimization of jet mill bit considering the characteristics of depressurization and cuttings cleaning

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Petroleum Science 2023年第5期20卷 3085-3099页

作者： tong cao Xu-Yue Chen Kai-An Yu Lin Tang School of Mechatronic Engineering Xi'an Technological UniversityXi'anShaanxi710021China MOE Key Laboratory of Petroleum Engineering China University of PetroleumBeijing102249China College of Mechanical and Transportation Engineering China University of PetroleumBeijing102249China

A jet mill bit(JMB)is proposed to increase the drilling efficiency and safety of horizontal wells,which has the hydraulic characteristics of depressurization and cuttings *** paper fills the gap in the hydraulic study of the JMB by focusing on the hydraulic modeling and optimization of the JMB and considering these two hydraulic ***,the hydraulic depressurization model and the hydraulic cuttings cleaning model of the JMB are developed *** the models,the pressure ratio and efficiency are chosen as the evaluation parameters of the depressurization capacity of the JMB,and the jet hydraulic power and jet impact force are chosen as the evaluation parameters of cuttings cleaning capacity of the ***,based on the hydraulic models,the effects of model parameters[friction loss coefficient,target inclination angle,rate of penetration(ROP),flow ratio,and well depth]on the hydraulic performance of the JMB are *** results show that an increase in the friction loss coefficient and target inclination angle cause a significant reduction in the hydraulic depressurization capacity,and the effect of ROP is *** flow ratio is positively related to the hydraulic cuttings cleaning capacity,and the well depth determines the maximum hydraulic cuttings cleaning ***,by combining the hydraulic depressurization model and hydraulic cuttings cleaning model,an optimization method of JMB hydraulics is proposed to simultaneously maximize the jet depressurization capacity and the cuttings cleaning *** to the drilling parameters given,the optimal values of the drilling fluid flow rate,backward nozzle diameter,forward nozzle diameter,and throat diameter can be ***,a case study is conducted to verify the effectiveness of the optimization method.

关键词： Jet mill bit Hydraulic depressurization model Hydraulic cuttings cleaning model Parametric study Hydraulic optimization

儿童过敏性紫癜、紫癜性肾炎的中西医结合诊疗方案

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北京中医药 2024年第2期43卷 109-113页

作者：胡艳袁昕曹童童黄静张克青首都医科大学附属北京儿童医院中医科北京100045

过敏性紫癜(Henoch-Schmleipurpura,HSP)是儿童常见疾病,其临床表现多样,可导致多脏器损害,严重影响儿童的生长发育与身心健康。HSP好发于学龄期儿童,秋冬季高发,是一种与IgA沉积相关的免疫介导性血管炎,西医主要采用对症及支持治疗,使... 详细信息

过敏性紫癜(Henoch-Schmleipurpura,HSP)是儿童常见疾病,其临床表现多样,可导致多脏器损害,严重影响儿童的生长发育与身心健康。HSP好发于学龄期儿童,秋冬季高发,是一种与IgA沉积相关的免疫介导性血管炎,西医主要采用对症及支持治疗,使用激素、免疫抑制剂等,但目前尚无统一的治疗方案。HSP属中医学“斑疹”和“血证”范畴,中医药治疗具有一定特色与优势,在疾病的不同阶段采用中西医结合治疗,可以达到优势互补、提质增效、缩短病程、控制复发及改善预后的目的。为进一步规范HSP的中西医结合诊断及治疗,由首都医科大学附属北京儿童医院中医科组织专家,依据相关文献及诊疗经验制定本诊疗方案,以期提高临床医师对本病的认识及诊治能力。

关键词：过敏性紫癜紫癜性肾炎儿童中西医结合诊疗方案

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集成式GaN单开关管功率因数校正变换器

重庆大学学报 2024年第7期47卷 63-73页

作者：曹通秦世清何映谊李婷张秀梅杨国锋卞宝安江南大学理学院江苏无锡214122

传统的降压型功率因数校正(power factor correction,PFC)变换器由于存在高谐波电流的缺点,较难满足IEC61000-3-2 C类限值,其应用受到很大限制。文中设计并搭建了一种集成式功率因数校正变换器,该变换器由一个降压PFC变换器和一个反激PF... 详细信息

传统的降压型功率因数校正(power factor correction,PFC)变换器由于存在高谐波电流的缺点,较难满足IEC61000-3-2 C类限值,其应用受到很大限制。文中设计并搭建了一种集成式功率因数校正变换器,该变换器由一个降压PFC变换器和一个反激PFC变换器组成,其中降压和反激PFC变换器采用输入并联和输出并联连接方式共用一个GaN开关管和控制电路,降低变换器成本。集成式变换器在临界导通模式(critical conduction mode,CRM)恒定导通时间(constant on time,COT)控制下,反激单元消除了降压输入电流死区的影响,利用降压和反激PFC变换器的优势和GaN开关管的优异性能,变换器可以在宽电压输入范围下实现高效率和低总谐波失真。文中介绍了电路结构和工作原理,通过PSIM(power simulation)仿真验证理论推导的正确性,最后搭建了满载效率为94.1%的120 W样机,验证了该方案的可行性。

关键词：功率因数校正变换器氮化镓集成式低总谐波失真

Dan Bai Xiao Formula combined with glucocorticoids and cyclophosphamide for pediatric lupus nephritis:A pilot prospective study

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World Journal of Clinical Cases 2022年第31期10卷 11391-11402页

作者： tong-tong cao Li Chen Xiao-Fang Zhen Gao-Jie Zhao Hui-Fang Zhang Yan Hu Department of Traditional Chinese Medicine Beijing Children’s HospitalCapital Medical UniversityNational Center for Children’s HealthBeijing 100045China

BACKGROUND Patients with lupus nephritis(LN)typically undergo long-term treatment with glucocorticoids(GCs)and *** is a growing demand for optimal therapy with better remission results and fewer side *** traditional Chinese medicine(TCM)might be quite valuable for multitarget therapy,reducing the total dosage of GCs and minimizing the side effects of *** To evaluate whether Dan Bai Xiao Formula(DBXF)can reduce the exposure to GCs and cyclophosphamide(CYC)and to assess the efficacy and safety of DBXF for the resolution of proteinuria and hematuria in children with *** A 24-wk pilot study was conducted at Beijing Children’s *** with active LN were divided into either a TCM group or a control *** in the TCM group received DBXF combined with GCs and CYC,and the ones in the control group received GCs and CYC every 4 wk for 24 *** primary endpoints of this trial were urinary protein excretion of0.05).The urine red blood cell count and urine protein level were significantly lower in the TCM group than in the control group at weeks 4,12,and 24(P<0.05).Furthermore,patients in the TCM group had a lower proportion of methylprednisolone pulses than those in the control group(1.30±1.41 vs 3.05±2.02,P<0.0001).The ending GC dose was significantly lower in the TCM group than in the control group(P<0.001).Moreover,more hepatic function damage,gastrointestinal adverse effects,and hypertension were observed in the control group than in the TCM group(P<0.05).CONCLUSION The findings suggest that DBXF tr

关键词： Lupus nephritis Traditional Chinese medicine Dan Bai Xiao Formula Effective Safe

A comprehensive review on microchannel heat sinks for electronics cooling

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International Journal of Extreme Manufacturing 2024年第2期6卷 133-162页

作者： Zhi-Qiang Yu Mo-tong Li Bing-Yang cao Key Laboratory for Thermal Science and Power Engineering of Ministry of Education Department of Engineering MechanicsTsinghua UniversityBeijing 100084People’s Republic of China

The heat generation of electronic devices is increasing dramatically,which causes a serious bottleneck in the thermal management of electronics,and overheating will result in performance deterioration and even device *** the development of micro-machining technologies,the microchannel heat sink(MCHS)has become one of the best ways to remove the considerable amount of heat generated by high-power *** has the advantages of large specific surface area,small size,coolant saving and high heat transfer *** paper comprehensively takes an overview of the research progress in MCHSs and generalizes the hotspots and bottlenecks of this *** heat transfer mechanisms and performances of different channel structures,coolants,channel materials and some other influencing factors are ***,this paper classifies the heat transfer enhancement technology and reviews the related studies on both the single-phase and phase-change flow and heat *** comprehensive review is expected to provide a theoretical reference and technical guidance for further research and application of MCHSs in the future.

关键词： microchannel heat sink thermal management of electronics microscale heat transfer heat transfer enhancement

术前血清PCSK9检测联合甘油三酯-葡萄糖指数、甘油三酯-高密度脂蛋白胆固醇比值对乳腺癌患者的临床应用价值

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皖南医学院学报 2024年第3期43卷 234-237页

作者：郭晖王月月李竟曹通王凤超蚌埠医科大学第一附属医院检验科安徽蚌埠233004

目的:探讨术前血清前蛋白转化酶枯草溶菌素9(PCSK9)检测联合甘油三酯-葡萄糖指数(TyG)、甘油三酯-高密度脂蛋白胆固醇比值(TG/HDL-c)对乳腺癌患者的临床意义。方法:收集蚌埠医科大学第一附属医院经病理确诊并手术治疗的乳腺癌患者122例... 详细信息

目的:探讨术前血清前蛋白转化酶枯草溶菌素9(PCSK9)检测联合甘油三酯-葡萄糖指数(TyG)、甘油三酯-高密度脂蛋白胆固醇比值(TG/HDL-c)对乳腺癌患者的临床意义。方法:收集蚌埠医科大学第一附属医院经病理确诊并手术治疗的乳腺癌患者122例,行手术切除的乳腺良性肿瘤患者76例,健康体检者105例,统计分析各组患者完整的病历资料,利用ROC曲线确定血清PCSK9、TyG及TG/HDL-c的最佳临界值,并分析其对乳腺癌患者预后的临床价值。结果:良性肿瘤组和健康对照组血清PCSK9、TyG及TG/HDL-c水平低于乳腺癌组(P<0.05);矫正多因素Logistic回归分析显示,血清TyG(OR=2.766,95%CI:1.449~5.278)、TG/HDL-c(OR=28.624,95%CI:5.055~162.094)及PCSK9(OR=1.082,95%CI:1.060~1.105)水平升高均为乳腺癌发生的危险因素(P<0.001)。ROC曲线评估显示,血清PCSK9、TyG和TG/HDL-c联合分析(AUC=0.905)诊断效能高于TyG(AUC=0.797)和TG/HDL-c(AUC=0.713),P<0.01。结论:血清PCSK9、TyG和TG/HDL-c可作为乳腺癌患者辅助性诊断指标。

关键词：血清前蛋白转化酶枯草溶菌素9 甘油三酯-葡萄糖指数甘油三酯-高密度脂蛋白胆固醇比值乳腺癌

Emerging trends and prospects of electroconductive bioinks for cell-laden and functional 3D bioprinting

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Bio-Design and Manufacturing 2022年第2期5卷 396-411页

作者： Harish K.Handral Vaishali P.Natu tong cao Jerry Y.H.Fuh Gopu Sriram Wen F.Lu Department of Mechanical Engineering National University of SingaporeSingaporeSingapore Faculty of Dentistry National University of SingaporeSingaporeSingapore NUS Centre for Additive Manufacturing(AM.NUS) SingaporeSingapore

Introduction 3D bioprinting offers a unique biofabrication platform that allows the generation of functional tissue constructs in a spatially/geometrically controlled and automated manner using a 3 D printer and *** serves as the carrier medium that provides the ideal physico-mechanical characteristics for printability,shape fidelity,and support;and a biological microenvironment for the living cells prior to,during.

关键词： printing functional printer