|
|
|
题名
|
作者
|
年代
|
出处
|
被引量
|
| 1 | Ion engine grids:Function,main parameters,issues,configurations,geometries,materials and fabrication methods显示文摘Ion optics are crucial components of ion thrusters and the study of the different ion extraction solutions used since the beginning of the electric propulsion era is essential to understand the evolution of ion engines. This work describes ion engine grids' main functions, parameters and issues related to thermal expansion and sputter erosion, and then introduces a review of ion optics used for significant launched and tested ion thrusters since 1970. Configurations, geometries, materials and fabrication methods are analyzed to understand when typical ion thrusters use two or three grids, what are the thicknesses and aperture sizes of the screen, accelerator and decelerator grids, why molybdenum and carbon-based materials such as pyrolytic graphite and carbon–carbon are the best available options for ion optics and what is the manufacturing method for each material. | Miguel SANGREGORIO Kan XIE Ningfei WANG Ning GUO Zun ZHANG | 2018 | Chinese Journal of Aeronautics2018，31，8： | 4 |
| 2 | β-hydroxy-β-methylbutyrate Improves Chronic Renal Failure-Induced Sarcopenia in SD Rats by Regulating Autophagy显示文摘Background Chronic renal failure-induced sarcopenia(CRF-S)seriously affects public health by increasing morbidity and mortality.This study evaluated the therapeutic effects ofβ-hydroxy-β-methylbutyrate acid(HMB)and the underlying mechanism in an adenine-induced CRF-S rat model.Methods Sprague Dawley rats were divided into control,model(CRF-S),and HMB treatment(CRF-S+HMB)groups.The rats in the CRF-S group received 250 mg/kg/d adenine by oral gavage every day for 14 days,followed by administration every other day until the 28th day.In the CRF-S+HMB group,each rat was given 320 mg/kg/d HMB by oral gavage starting from 7 days prior to adenine treatment,and this treatment was maintained for a total of 35 days.The body weight,right anterior tibial muscle weight,blood serum parameters,gastrocnemius muscle and renal tissue histology,and expression of autophagy-related transcripts and proteins were evaluated.Results A rat model of CRF-S was successfully established via adenine gavage,as indicated by reduced body weight and muscle weights,and markers of sarcopenia.There were increased mRNA levels of LC3B,Beclin1,Ulk1,Atg5,Atg7,Atg13 and vps-34,and increased protein expression levels of LC3B and P62.In the rats with HMB intervention,the body weight,right anterior tibial weight and gastrocnemius muscle histology were not significantly different from those in the control group,and the expression levels of autophagy-related proteins(LC3B and P62)were consistent with those in the control group.Conclusion We successfully established a rat model of CRF-S using adenine administered via oral gavage,and observed that HMB treatment prevented CRF-S. | Zun Yue Zhang Liu Qing Yang Ya Nan Yang Yun Lin Wang Long Mei Zhang Kun Hua Wang Min Weng | 2021 | Journal of Nutritional Oncology2021，6，4： | 4 |
| 3 | A Centralized Report on Pediatric Japanese Encephalitis Cases from Beijing Children's Hospital,2013显示文摘Fifteen pediatric cases of suspected Japanese encephalitis(JE)were reported in Beijing Children’s Hospital during the late summer of 2013.The clinical manifestations in most cases included high fever,seizures,and abnormal magnetic resonance imaging findings.Twelve of 15 cases were laboratory-confirmed as JE cases by pathogen identification.Epidemiological investigations showed that five of the 12 | LI Jiu Wei GAO Xiao Yan WU Yun FU Shi Hong TAN Xiao Juan CAO Yu Xi ZHANG Wei Hua YIN Zun Dongs HE Ying LI Yi Xing LIANG Guo Dong XU Wen Bo FANG Fang WANG Huan Yu | 2016 | Biomedical and Environmental Sciences2016，29，12： | 4 |
| 4 | A Constant Potential Molecular Dynamics Simulation Study of the Atomic-Scale Structure of Water Surfaces Near Electrodes显示文摘Summary of main observation and conclusion Novel and technologically important processes and phenomena arise at water surfaces in the presence of electric fields.However,experimental measurements on water surfaces are challenging,and the results are scarce and inconclusive.In this work,the constant potential molecular dynamics method,in which the electrode charges are allowed to fluctuate to keep the electric potential fixed,was implemented in the study of a near-electrode water surface systems.This simulation system was set up with a vapor/liquid-water/vapor slab and two electrodes under different sets of applied electrostatic potential,yielding i)a detailed characterization of the external E-field dependent electrostatic potential/density/dipole moment density profiles,and ii)the relationship between the water surface width and the applied electrode voltage differences which has been rarely reported.The adjustments in the number density profiles in the vicinity of water surfaces due to external E-fields were observed,while the capillary interfacial widths for the surfaces near both cathode and anode were found with different increment rates under increasing E-fields.By examining dipole density profiles across the water surfaces,we found that external E-field induced polarization occurs in both bulk and surface regimes,yet the surface polarization densities vary asymmetrically with respect to the increasing E-fields.Detailed discussions were carried out to explain the correlation between water surface tension and surface widths,as well as the interplay between the surface polarization densities and the hydrogen bond network structure.We conclude that the mechanical and structural properties of the water surfaces could be tuned by both magnitude and direction of the strong external E-fields.We also recognize that more surface properties with application value,such as dielectric permittivity tensor or surface potential,could also be regulated by the external E-fields. | Pengli Yang Zhenxing Wang Zun Liang Hongtao Liang Yang Yang | 2019 | Chinese Journal of Chemistry2019，37，12： | 2 |
| 5 | Scaling effects on combustion modes in a single-side expansion kerosene-fueled scramjet combustor显示文摘The combustion modes in two different scramjet combustors with the mass flow rates of 1.8 kg/s and 3.6 kg/s are experimentally investigated to explore the scaling effects on supersonic combustion with a Mach number 2.0 inflow.It is found that the scramjet combustor with a larger scale can broaden the flame rich blowout limit.As the Equivalence Ratio(ER)increases,the combustion in the small-scale combustor maintains in the cavity-stabilized mode,and the flamebase moves downstream along the cavity shear layer;however,the combustion in the large-scale combustor gradually transfers from the cavity-stabilized mode to the jet-wake-stabilized mode.The differences in the cavity residence time,the ignition delay time and the Damkohler number caused by different scales of the scramjet combustor are likely to account for the scaling effects on the combustion modes. | Fan LI Mingbo SUN Jiajian ZHU Zun CAI Hongbo WANG Yanxiang ZHANG Yongchao SUN | 2021 | Chinese Journal of Aeronautics2021，34，5： | 2 |
| 6 | Japanese Encephalitis in China in the Period of 1950–2018:From Discovery to Control显示文摘Japanese encephalitis(JE)was first discovered in Japan in 1871;in 1924,a major outbreak occurred,with 6,000 JE cases reported and a mortality rate of approximately 60%[1,2].Later studies showed that JE is caused by the Japanese encephalitis virus(JEV),which is spread by mosquitoes. | CHEN Xiao Jing WANG Huan Yu LI Xiao Long GAO Xiao Yan LI Ming Hua FU Shi Hong HE Ying LI Fan YIN Qi Kai XU Song Tao WU Dan LI Yi Xing YIN Zun Dong YANG Guang LIANG Guo Dong | 2021 | Biomedical and Environmental Sciences2021，34，3： | 2 |
| 7 | Structures,Binding Energies and Magnetic Moments of Small Iron Clusters:A Study Based on All-electron DFT显示文摘 | MA Qing-min XIE Zun WANG Jing | 2007 | Solid State Comm2007，142，： | 1 |
| 8 | Heterogeneous relational message passing networks for molecular dynamics simulations显示文摘With many frameworks based on message passing neural networks proposed to predict molecular and bulk properties,machine learning methods have tremendously shifted the paradigms of computational sciences underpinning physics,material science,chemistry,and biology.While existing machine learning models have yielded superior performances in many occasions,most of them model and process molecular systems in terms of homogeneous graph,which severely limits the expressive power for representing diverse interactions.In practice,graph data with multiple node and edge types is ubiquitous and more appropriate for molecular systems.Thus,we propose the heterogeneous relational message passing network(HermNet),an end-to-end heterogeneous graph neural networks,to efficiently express multiple interactions in a single model with ab initio accuracy.HermNet performs impressively against many top-performing models on both molecular and extended systems.Specifically,HermNet outperforms other tested models in nearly 75%,83%and 69%of tasks on revised Molecular Dynamics 17(rMD17),Quantum Machines 9(QM9)and extended systems datasets,respectively.In addition,molecular dynamics simulations and material property calculations are performed with HermNet to demonstrate its performance.Finally,we elucidate how the design of HermNet is compatible with quantum mechanics from the perspective of the density functional theory.Besides,HermNet is a universal framework,whose sub-networks could be replaced by other advanced models. | Zun Wang Chong Wang Sibo Zhao Yong Xu Shaogang Hao Chang Yu Hsieh Bing-Lin Gu Wenhui Duan | 2022 | npj Computational Materials2022，，1： | 1 |
| 9 | 超声速燃烧室内凹腔点火过程的数值研究显示文摘目的:超燃冲压发动机的点火过程是超声速燃烧领域的重要课题之一。目前,针对超燃冲压发动机燃烧室点火过程的研究以实验研究为主,数值研究则相对较少。本文旨在基于大涡模拟研究点火位置对点火过程的影响,并在此基础上分析导致点火失败的原因。创新点:1.基于大涡模拟,研究点火位置对点火过程建立的影响;2.发现了流动耗散和直接吹熄两种熄火模式。方法:1.基于CHEMKIN,选择合适的化学反应机理;2.在简化化学反应机理的基础上,利用大涡模拟研究不同点火位置对点火过程的影响;3.分析数值仿真数据,寻找能成功实现点火的点火位置,并探讨导致点火失败的因素。结论:1.在凹腔后缘处点火可以成功实现发动机点火;2.发现了两种点火失败的模式,即流动耗散模式和直接吹熄模式;3.流动耗散模式主要发生在凹腔前缘和凹腔中部,而直接吹熄模式主要发生在剪切层中。 | Yong-chao SUN Zun CAI Tai-yu WANG Ming-bo SUN Cheng GONG Yu-hui HUANG | 2020 | Journal of Zhejiang University-Science A(Applied Physics & Engineering)2020，21，10： | 1 |
| 10 | Predictive Value of Blood Pressure,Heart Rate,and Blood Pressure/Heart Rate Ratio in a Chinese Subpopulation with Vasovagal Syncope显示文摘Objective:The head-up tilt test(HUTT)is widely used but is time-consuming and not cost-effective to evaluate patients with vasovagal syncope(VVS).The present study aims to verify the hypothesis that ambulatory blood pressure(BP)monitoring(ABPM)and the simplistic tilt test may be potential alternatives to the HUTT.Methods:The study consecutively enrolled 360 patients who underwent the HUTT to evaluate VVS.BP),heart rate(HR),and BP/HR ratios derived from ABPM and the simplistic tilt test were evaluated to predict the presence,pattern,and stage of syncope during the HUTT.Results:Mixed response was the commonest pattern,and syncope occurred frequently with infusion of isoproterenol at a rate of 3μg/min.During the simplistic tilt test,the cardioinhibitory group had higher tilted BP/HR ratios than the vasodepressor group,while the vasodepressor group had a faster tilted HR and a larger HR difference than the cardioinhibitory group.The higher the BP/HR ratio in the tilted position,the higher the isoproterenol dosage needed to induce a positive response.During ABPM,BP/HR ratios were signifi cantly higher in the cardioinhibitory group than in the vasodepressor group.The higher the ABPM-derived BP,the higher the dosage of isoproterenol needed to induce syncope.There were signifi cant correlations in BP/HR ratios between ABPM and the supine position in the vasodepressor group,while signifi cant correlation was found only for the diastolic BP/HR ratio between ABPM and the tilted position in the cardioinhibitory group.The mixed pattern shared correlative features of the other two patterns.Conclusion:ABPM and the simplistic tilt test might be used as promising alternatives to the HUTT in VVS evaluation in clinical settings. | Zhuzhi Wen Jingying Hou Zun Mai Huifen Huang Yangxin Chen Dengfeng Geng Jingfeng Wang | 2021 | Cardiovascular Innovations and Applications2021，，1： | 0 |
| 11 | Influence of Basicity on the Formation of Cluster Ions/Adduct Ions for Organic Ammonium Halides by Positive Secondary Ion Mass Spectrometry显示文摘InfluenceofBasicityontheFormationofClusterIons/AdductIonsforOrganicAmmoniumHalidesbyPositiveSecondaryIonMasSpectrometryFUHua,... | FU Hua, CHEN Xin, LI Zhao long and ZHAO Yu fen * (Bioorganic Phosphorus Chemistry Laboratory, Department of Chemistry, Tsinghua University, Beijing, 100084) WANG Jing zun, XIAO Hong zhan and WU Yi (Beijing Institute of Microchemistry, Beijing, | 1997 | Chemical Research in Chinese Universities1997，13，4： | 0 |
| 12 | Ability of bryophytes to track areas of suitable climate depends on their habitat preferences显示文摘The impact of climate change on biodiversity operates through a complex mixture of habitat loss and range shift through the emergence of newly suitable areas(Warren et al.,2013).The main question is therefore to determine whether species have the ability to balance the loss of suitable habitats by effectively shifting their ranges and track suitable areas under climate change(Nogués-Bravo et al.,2018).Zanatta et al. | Zun Dai Jian Zhang Jian Wang | 2023 | Journal of Systematics and Evolution2023，61，1： | 0 |
| 13 | Symmetry-adapted graph neural networks for constructing molecular dynamics force fields显示文摘Molecular dynamics is a powerful simulation tool to explore material properties.Most realistic material systems are too large to be simulated using first-principles molecular dynamics.Classical molecular dynamics has a lower computational cost but requires accurate force fields to achieve chemical accuracy.In this work,we develop a symmetry-adapted graph neural network framework called the molecular dynamics graph neural network(MDGNN)to construct force fields automatically for molecular dynamics simulations for both molecules and crystals.This architecture consistently preserves translation,rotation,and permutation invariance in the simulations.We also propose a new feature engineering method that includes high-order terms of interatomic distances and demonstrate that the MDGNN accurately reproduces the results of both classical and first-principles molecular dynamics.In addition,we demonstrate that force fields constructed by the proposed model have good transferability.The MDGNN is thus an efficient and promising option for performing molecular dynamics simulations of large-scale systems with high accuracy. | Zun Wang Chong Wang SiBo Zhao ShiQiao Du Yong Xu Bing-Lin Gu WenHui Duan | 2021 | Science China(Physics,Mechanics & Astronomy)2021，64，11： | 0 |
| 14 | Application of Nutritional Support in the Comprehensive Treatment of Gastric Cancer: A Case Report显示文摘Objective To relieve long-term malnutrition caused by a malignant tumor affecting the pylorus and to prolong the patient survival.Methods A patient presented with complete pyloric obstruction due to pyloric tumors,and achieved good therapeutic effects through nutritional support and effective chemotherapy.Results After about 40 days of treatment,all physiological indicators were improving.After chemotherapy,the pyloric tumor shrank and the complete obstruction was relieved.The patient was able to eat and drink normally.Conclusion Nutritional support,combined with chemotherapy,may effectively treat complete pyloric obstruction caused by advanced tumors. | Yue Li Zun Yue Zhang Hua Wei Wang Jing Jiao Zhao Shi Tao Geng Kun Hua Wang | 2020 | Journal of Nutritional Oncology2020，5，4： | 0 |
| 15 | Extracellular vesicles from human urine-derived stem cells delay aging through the transfer of PLAU and TIMP1显示文摘Aging increases the risks of various diseases and the vulnerability to death.Cellular senescence is a hallmark of aging that contributes greatly to aging and aging-related diseases.This study demonstrates that extracellular vesicles from human urine-derived stem cells(USC-EVs)efficiently inhibit cellular senescence in vitro and in vivo.The intravenous injection of USC-EVs improves cognitive function,increases physical fitness and bone quality,and alleviates aging-related structural changes in different organs of senescence-accelerated mice and natural aging mice.The anti-aging effects of USC-EVs are not obviously affected by the USC donors’ages,genders,or health status.Proteomic analysis reveals that USC-EVs are enriched with plasminogen activator urokinase(PLAU)and tissue inhibitor of metalloproteinases 1(TIMP1).These two proteins contribute importantly to the anti-senescent effects of USC-EVs associated with the inhibition of matrix metalloproteinases,cyclin-dependent kinase inhibitor 2A(P16INK4a),and cyclin-dependent kinase inhibitor 1A(P21cip1).These findings suggest a great potential of autologous USC-EVs as a promising anti-aging agent by transferring PLAU and TIMP1 proteins. | Shanshan Rao Zehui He Zun Wang Hao Yin Xiongke Hu Yijuan Tan Tengfei Wan Hao Zhu Yi Luo Xin Wang Hongming Li Zhenxing Wang Xinyue Hu Chungu Hong Yiyi Wang Mingjie Luo Wei Du Yuxuan Qian Siyuan Tang Hui Xie Chunyuan Chen | 2024 | Acta Pharmaceutica Sinica B2024，14，3： | 0 |
| 16 | The Aggregation Kinetics of Colloidal Particles of Basic Yttrium Carbonate显示文摘The aggregation kinetics of basic yttrium carbonate pericles in aqueous solution havebeen studied using dynamic light-scattering techniques. In 1.00mol/l NaCl solution fast diffusionlimited aggregation behavior was observed with an increase in aggregate size over time describedby a power law. The aggregates are characterized by a fractal dimension D=1.82. Smoluchowskiand fractal theories were used to characterize the aggregation mechanism and to obtain theaggregation rate constant. | Hui WANG Zun Sheng CAI Yin Ming PAN Xue Zhuang ZHAO(Department of Chemistry,)Ying Li AN (The State Key Laboratory of Functional Polymer Meterials for Absorption and Separation,)Shi Yi GUO (The Electron Microscope Labrotory of College of Life ScienceNa | 1998 | Chinese Chemical Letters1998，9，12： | 0 |
| 17 | FORMATION OF 16.24-DEHYDROBILADIENE-ab FROH PYRROMETHENONE显示文摘In the reaction of Pyrromethenone with bromine in methanol a newcompound with two azafulvenes.16.24-dehydrobiladiene-ab.was firstinvestigated. | Jin She MA~- Chang Qi WANG~1 Qing Qi CHEN~2 Yong Yong LIU Jing Zun WANG~1 Sheng JIN~11.Institute of Photographic Chemistry,Academia Sinica,Beijing 1001012.Department of Chemistry.Peking University.Beijing 1008713.Beijing Institute of Microchemistry.Beijing 100091 | 1993 | Chinese Chemical Letters1993，4，12： | 0 |
| 18 | Clinical study of different modes of repetitive transcranial magnetic stimulation in the treatment of post‑stroke executive dysfunction显示文摘Objective:To investigate the clinical efficacy of intermittent theta burst stimulation(iTBS)and high frequency repetitive transcranial magnetic stimulation(rTMS)on post‑stroke executive impairment(PSEI).Methods:Ninety patients with PSEI who were hospitalized in the rehabilitation department of Xuzhou Central Hospital and Xuzhou Rehabilitation Hospital from April 2021 to June 2022 were selected and divided into iTBS group,high‑frequency group and control group.All three groups of patients received routine rehabilitation training,given rTMS treatment with iTBS,10 Hz and shame stimulation for 4 weeks.Before and after treatment,all the patients were evaluated with the Montreal cognitive assessment(MoCA),the frontal assessment battery(FAB),troop color‑word test(SCWT),shape trails test(STT),digit span test(DST)and event related potential P300.Results:After treatment,MoCA,FAB,SCWT,STT,DST scores,P300 latency and amplitude were significantly better in the three groups than before treatment(P<0.05).MoCA,FAB,SCWT,STT‑B,DST scores,P300 latency and amplitude in the iTBS group and high‑frequency group were better than in the control group,with significant differences(P<0.05).The difference between iTBS group and high‑frequency group was not statistically significant(P>0.05).Conclusion:iTBS can improve PSEI,and the efficacy is comparable to 10Hz rTMS.iTBS takes less time with better efficiency,and it is worth popularizing and applying in clinic. | TIAN Geng‑run WANG Shi‑yan BI Ying‑li GONG Zun‑ke WANG Xiang WANG Mi LU Si‑han ZHOU Hui | 2023 | Journal of Hainan Medical University2023，29，12： | 0 |
| 19 | Index Geographic Gossip Algorithm for Information Dissemination over Regular Graphs显示文摘An Index geographic gossip(IGG)algorithm is proposed. Relay nodes participate in information exchange and updating. The cumulative number of times these nodes participate is characterized by an index number, which can be used to accelerate information updating. The convergence property of the IGG algorithm is theoretically analyzed in ring and grid network topologies. The IGG algorithm improves the standard gossip algorithm by a gain of O(n) in both convergence time and communication cost. Compared to the geographic gossip algorithm, the IGG algorithm has a gain on the order of O(n) and O(n1/2) in the average hop count for information exchange and communication cost, respectively. Finally, the proposed IGG algorithm is compared with various baselines through simulations,and it is shown that significant performance gain can be achieved. | WANG Gang LIN Zun WANG Fuxiang | 2019 | Chinese Journal of Electronics2019，28，2： | 0 |
| 20 | The preparation of functionalized single walled carbon nanotubes as high efficiency DNA carriers显示文摘断然控告的单个围的碳 nanotubes (SWNTs+) 被与 CONHC6H12NH3+ 结合准备。双海滨 DNA (dsDNA ) 链经由静电的相互作用被装载到 SWNTs+ 上。SWNTs+ 表演改善了与为充电的自由单身者的相比向 dsDNA 装载效率(353.5 μ g /mg ) 围的碳 nanotubes (SWNT )(82.9 μ g /mg ) 。 | Xiao Ying Yang Zun Feng Liu Jie Mao Shu Jing Wang Yan FengMa Yong Sheng Chen | 2007 | Chinese Chemical Letters2007，18，12： | 0 |
您所在的机构暂未开通此部分的功能，请联系管理员