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A fuse-based DC circuit breaker with vacuum interrupter enhanced by an external transverse magnetic field

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HIGH VOLTAGE 2024年第3期9卷 710-720页

作者： Xiao, yu Wu, Yi Wu, Yifei yang, Fei Rong, Mingzhe yang, zhuo Xi An Jiao Tong Univ Sch Elect Engn State Key Lab Elect Insulat & Power Equipment Xian Peoples R China State Grid Shaanxi Elect Power Co Ltd Xian Peoples R China

Due to the increasing power system capacity, the interruption of large fault currents has gradually become a major challenge in power systems. At the moment, such currents are interrupted mainly via circuit breakers based on the method of active current commutation. However, these types of circuit breakers tend to be costly and oversized. One possible alternative-a fuse-based circuit breaker with current commutation process enhanced by an external transverse magnetic field (ETMF)-is proposed by the authors. Its main advantage lies in the fast current commutation achieved by an ETMF-enhanced three-stage increase of the vacuum arc voltage. The study of the current commutation process is mainly represented by the authors, and the influencing factors of the current commutation-contact opening speed and ETMF current-are discussed. At last, the proposed circuit breaker is verified by an experiment, whose results show that a short-circuit current of 42 kA can be interrupted within just 2 ms.

关键词： CURRENT COMMUTATION

Effect of initial ammonium concentration on a one-stage partial nitrification/anammox biofilm system:Nitrogen removal performance and the microbial community

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Journal of Environmental Sciences 2024年第9期143卷 176-188页

作者： Mengyu Zhou yun Han yang zhuo Fen yu Gaoyuan Hu Dangcong Peng School of Municipal and Environmental Engineering Xi’an University of Architecture and TechnologyXi’an 710055China Shaanxi Key Laboratory of Environmental Engineering Xi’an University of Architecture and TechnologyXi’an 710055China Key Laboratory of Northwest Water Resource Environment and EcologyMOEXi’an University of Architecture and TechnologyXi’an 710055China

One-stage partial nitrification coupled with anammox(PN/A)technology effectively reduces the energy consumption of a biological nitrogen removal *** nitrite-oxidizing bacteria(NOB)is essential for this technology to maintain efficient nitrogen removal *** ammonium concentration(IAC)affects the degree of inhibited *** this study,the effect of the IAC on a PN/A biofilm was investigated in a moving bed biofilm *** results showed that nitrogen removal efficiency decreased from 82.49%±1.90%to 64.57%±3.96%after the IAC was reduced from 60 to 20 mg N/L,while the nitrate production ratio increased from 13.87%±0.90%to 26.50%±3.76%.NOB activity increased to1,133.86 mg N/m^(2)/day after the IAC decreased,approximately 4-fold,indicating that the IAC plays an important inhibitory role in *** rate-limiting step in the mature biofilm of the PN/A system is the nitritation process and is not shifted by the *** analysis of the microbial community structure in the biofilm indicates that the IAC was the dominant factor in changes in community *** and *** were the main anammox bacteria,and Nitrosomonas and Nitrospira were the main AOB and NOB,*** did not affect the difference in growth between *** and ***,modulating the IAC promoted the PN/A process with efficient nitrogen removal performance at medium to low ammonium concentrations.

关键词： Biological nitrogen removal Partial nitrification Anammox Ammonium concentration Biofilm

Relative Broken Family Sensitivity

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Acta Mathematica Sinica,English Series 2024年第9期40卷 2297-2306页

作者： zhuo Wei LIU Tao yu Department of Mathematics Shantou UniversityShantou 515063P.R.China

Letπ:(X,T)→(Y,S)be a factor map between two topological dynamical systems,and F_(a) Furstenberg family of *** introduce the notion of relative broken *** Fs(***,Finf)be the families consisting of all syndetic subsets(*** upper Banach density subsets,infinite subsets).We show that for a factor mapπ:(X,T)→(Y,S)between transitive systems,πis relatively broken F-sensitive for F=Fs or Fpubd if and only if there exists a relative sensitive pair which is an F-recurrent point of(R_(π),T^((2)));is relatively broken Finf-sensitive if and only if there exists a relative sensitive pair which is not *** a factor mapπ:(X,T)→(Y,S)between minimal systems,we get the structure of relative broken F-sensitivity by the factor map to its maximal equicontinuous factor.

关键词： Relative sensitivity recurrent points Furstenberg family relative sensitive pairs maximal equicontinuous factor

Fertility achieved through in vitro fertilization in a male patient with 48,XXYY syndrome

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Asian Journal of Andrology 2018年第2期20卷 208-209页

作者： De-Feng Liu Lian-Ming Zhao Kai Hong Jia-Ming Mao yu-zhuo yang Zhe Zhang Hui Jiang Reproduetive Medical Center Peking University Third Hospital Beijing 100191 China Department of Urology Peking University Third Hospital Beijing 100191 China

The 48,XXYY syndrome is a rare sex chromosome aneuploidy with an incidence of 1：18 000-1：40 000 male births and is associated with hypergonadotropic hypogonadism as an endocrine disorder. Most men with this syndrome are never diagnosed in China. Due to sex chromosome aneuploidies and limited effective communication, these patients suffer from infertility.

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Embracing the age of artificial intelligence:paradigm shifts,opportunities,and challenges in the treatment of acute graft-versus-host disease after allogeneic hematopoietic stem cell transplantation

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Science China(Life Sciences) 2024年第6期67卷 1302-1304页

作者： zhuo-yu An Xiao-Hui Zhang Peking University People’s Hospital Peking University Institute of HematologyBeijing 100044China Collaborative Innovation Center of Hematology Peking UniversityBeijing 100044China Beijing Key Laboratory of Hematopoietic Stem Cell Transplantation Beijing 100044China National Clinical Research Center for Hematologic Disease Beijing 100044China

Allogeneic hematopoietic stem cell transplantation(allo-HSCT)is an important medical development in treating hematological ***,the risk of acute graft-versus-host disease(a GVHD)severely limits its use.a GVHD is a sev... 详细信息

关键词： hematopoietic graft artificial

Altered microRNA profiles of testicular biopsies from patients with nonobstructive azoospermia

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Asian Journal of Andrology 2020年第1期22卷 100-105页

作者： Hai-Tao Zhang Zhe Zhang Kai Hong Wen-Hao Tang De-Feng Liu Jia-Ming Mao yu-zhuo yang Hao-Cheng Lin Hui Jiang Department of Urology Peking University Third HospitalBeijing 100191China Department of Andrology Peking University Third HospitalBeijing 100191China Department of Human Sperm Bank Peking University Third HospitalBeijing 100191China Department of Reproductive Medicine Center Peking University Third HospitalBeijing 100191China

Many studies have shown that microRNAs(miRNAs)play vital roles during the ***,little is known about the altered miRNA profiles of testicular tissues in nonobstructive azoospermia(NOA).Using microarray technology,the miRNA expression profiles of testicular biopsies from patients with NOA and of normal testicular tissues were *** analyses were conducted to predict the enriched biological processes and functions of identified *** microarray data were validated by quantitative reverse transcriptase polymerase chain reaction(qRT-PCR),the results of which were then validated with a larger sample *** between the miRNA expression levels and clinical characteristics were *** operating characteristic(ROC)curve analysis was used to evaluate the diagnostic ability of miRNAs for *** clustering showed that 129 miRNAs were significantly differentially expressed between the NOA and control *** analysis indicated that the differentially expressed miRNAs were involved in spermatogenesis,cell cycle,and mitotic *** the subsequent qRT-PCR assays,the selected miRNA expression levels were consistent with the microarray results,and similar validated results were obtained with a larger sample *** clinical characteristics were significantly associated with the expression of certain *** particular,we identified a combination of two miRNAs(miR-10b-3p and miR-34b-5p)that could serve as a predictive biomarker of *** study provides altered miRNA profiles of testicular biopsies from NOA patients and examines the roles of miRNAs in *** profiles may be useful for predicting and diagnosing the presence of testicular sperm in individuals with azoospermia.

关键词： male infertility microRNA nonobstructive azoospermia spermatogenesis

Dual-salt poly(tetrahydrofuran) electrolyte enables quasi-solid-state lithium metal batteries to operate at -30 ℃

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Journal of Energy Chemistry 2024年第9期96卷 456-463页

作者： Zhiyong Li zhuo Li Rui yu Xin Guo School of Materials Science and Engineering State Key Laboratory of Material Processing and Die&Mould TechnologyHuazhong University of Science and TechnologyWuhan 430074HubeiChina The State Key Laboratory of Refractories and Metallurgy and Institute of Advanced Materials and Nanotechnology Wuhan University of Science and TechnologyWuhan 430081HubeiChina

The stable operation of solid-state lithium metal batteries at low temperatures is plagued by severe restrictions from inferior electrolyte-electrode interface compatibility and increased energy barrier for Li^(+)***,we prepare a dual-salt poly(tetrahydrofuran)-based electrolyte consisting of lithium hexafluorophosphate and lithium difluoro(oxalato)borate(LiDFOB).The Li-salt anions(DFOB−)not only accelerate the ring-opening polymerization of tetrahydrofuran,but also promote the formation of highly ion-conductive and sustainable interphases on Li metal anodes without sacrificing the Li^(+)conductivity of electrolytes,which is favorable for Li^(+)transport kinetics at low *** of this polymer electrolyte in Li||LiFePO_(4)cells show 82.3%capacity retention over 1000 cycles at 30℃and endow stable discharge capacity at−30℃.Remarkably,the Li||LiFePO4 cells retain 52%of their room-temperature capacity at−20℃and 0.1 *** rational design of dual-salt polymer-based electrolytes may provide a new perspective for the stable operation of quasi-solid-state batteries at low temperatures.

关键词： Poly(tetrahydrofuran) Dual-salt electrolyte Solidel ectrolyte interphase Low-temperature operation Quasi-solid-state battery

Nanotechnology-assisted adipose-derived stem cell （ADSC） therapy for erectile dysfunction of cavernous nerve injury： In vivo cell tracking, optimized injection dosage, and functional evaluation

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Asian Journal of Andrology 2018年第5期20卷 442-447页

作者： Han Wu Wen-Hao Tang Lian-Ming Zhao De-Feng Liu yu-zhuo yang Hai-Tao Zhang Zhe Zhang Kai Hong Hao-Cheng Lin Hui Jiang Department of Urology Peking University Third Hospital Beijing 100191 China Department of Reproductive Medicine Center Peking University Third Hospital Beijing 100191 China Department of Andrology Peking University Third Hospital Beijing 100191 China Department of Human Sperm Bank Peking University Third Hospital Beijing 100191 China

Stem cell therapy is a potentially promising option for erectile dysfunction; however, its risk of tumorigenicity is a clinical hurdle and the risk is positively related to the number of injected cells. Our previous study showed that nanotechnology improved adipose-derived stem cell （ADSC） therapy for erectile dysfunction of cavernous nerve injury （CNI） by attracting cells in the corpus cavernosum. These results indicated the possibility of using a reduced dosage of ADSCs for intracavernous injection. In this exploratory study, we used lower dosage （2 × 105 cells） of ADSCs for intracavernous injection （ICI） and the nanotechnology approach. Intracavernous pressure and mean arterial pressure were measured at day 28 to assess erectile function. The low-dose ADSC therapy group showed favorable treatment effects, and nanotechnology further improved these effects. In vivo imaging of ICI cells revealed that the fluorescein signals of NanoShuttle-bound ADSCs （NanoADSCs） were much stronger than those of ADSCs at days 0, 1, and 3. Both immunofluorescence and Western blot analysis showed a significant increase in smooth muscle, endothelium, and nerve tissue in the ADSC group compared to that in the CNI group; further improvement was achieved with assisted nanotechnology. These findings demonstrate that nanotechnology can be used to further improve the effect of small dosage of ADSCs to improve erectile function. Abundant NanoADSCs remain in the corpus cavernosum in vivo for at least 3 days. The mechanism of erectile function improvement may be related to the regeneration of the smooth muscle, endothelium, and nerve tissues.

关键词： adipose-derived stem cell (ADSC) cavernous nerve injury cell tracking erectile dysfunction

Boosting propane dehydrogenation of defective S-1 stabilized singleatom Pt and ZnO catalysts via coordination environment regulation

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Nano Research 2024年第7期17卷 5884-5896页

作者： Fuwen yang Jie Zhang Jinwei Chen Gang Wang Tong yu Qian Li Zongbo Shi Qiushi Sun Runsheng zhuo Ruilin Wang College of Materials Science and Engineering Sichuan UniversityChengdu 610065China Engineering Research Center of Alternative Energy Materials&Devices Ministry of EducationSichuan UniversityChengdu 610065China REZEL Catalysts Corporation Shanghai 200120China

Pt single atoms catalysts with precise coordination environment and high stability are expected to achieve high performance of propane dehydrogenation(PDH).In this work,an innovative synthetic strategy is proposed to construct the S-1@0.1Pt9Zn@DPS-1 nanocomposite as a highly efficient PDH *** engineering is applied to induce the formation of defective porous silicalite-1(DPS-1),which is favorable for achieving the uniformly distributed ZnO *** ZnO nanoclusters were further served as anchoring sites to stabilize the isolated Pt *** structural characterization revealed that penta-O coordinated Pt single atom coupled with ZnO nanoclusters decorated on the ***,the atomically dispersed Pt atoms with the ideal coordination environment could act as the predominant active sites for PDH *** expected,the optimal S-1@0.1Pt9Zn@DPS-1 catalyst delivered an excellent PDH performance(propane conversion of 40.7%,propylene selectivity of 97.5%)and good cycling regeneration *** work provides a new way for improving the activity and stability of catalysts in the field of industrial catalysts.

关键词： defect engineering single platinum atom coordination environment propane dehydrogenation propylene