检索结果-南通市图书馆

A comprehensive fluid-solid coupling dynamic simulation for spatiotemporal distribution of regression rate in hybrid rocket motors

同方期刊数据库博看期刊评论

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Aeronautics 2024年第9期37卷 100-112页

作者： tianfang WEI Guobiao CAI Hui tian xiangyu MENG Xianzhu JIANG Xiaoming GU School of Astronautics Beihang UniversityBeijing 100191China Key Laboratory of Spacecraft Design Optimization&Dynamic Simulation Technologies Ministry of Education Beijing 100191China

The spatiotemporal distribution characteristics of the regression rate are crucial aspects of the research on Hybrid Rocket Motor(HRM).This study presents a pioneering effort in achiev-ing a comprehensive numerical simulation of fluid dynamics and heat transfer in both the fluid and solid regions throughout the entire operation of an *** accomplish this,a dynamic grid tech-nique that incorporates fluid-solid coupling is *** validate the precision of the numerical simulations,a firing test is conducted,with embedded thermocouple probes being used to measure the inner temperature of the fuel *** temperature variations in the solid fuel obtained from both experiment and simulations show good *** maximum combustion temperature and average thrust obtained from the simulations are found to deviate from the experimental results by only 3.3%and 2.4%,***,it can be demonstrated that transient numerical simu-lations accurately capture the fluid-solid coupling characteristics and transient regression *** dynamic simulation results of inner flow field and solid region throughout the entire working stage reveal that the presence of vortices enhances the blending of combustion gases and improves the regression rate at both the front and rear ends of the fuel *** addition,oscillations of the regression rate obtained in the simulation can also be well corresponded with the corrugated surface observed in the ***,the zero-dimension regression rate formula and the for-mula describing the axial location dependence of the regression rate are fitted from the simulation results,with the corresponding coefficients of determination(R°)of 0.9765 and 0.9298,*** research serves as a reference for predicting the performance of HRM with gas oxygen and polyethylene,and presents a credible way for investigating the spatiotemporal distribution of the regression rate.

关键词： Hybrid Rocket Motor(HRM) Transient numerical simulation Fluid-solid couplingheat transfer Spatiotemporal distribution of regression rate Dynamic grid

Advance and Application of Single‑cell Transcriptomics in Auditory Research

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Neuroscience Bulletin 2024年第7期40卷 963-980页

作者： xiangyu Ma Jiamin Guo Mengyao tian Yaoyang Fu Pei Jiang Yuan Zhang Renjie Chai State Key Laboratory of Digital Medical Engineering Department of Otolaryngology Head and Neck SurgeryZhongda HospitalSchool of Life Sciences and TechnologyAdvanced Institute for Life and HealthJiangsu Province High‑Tech Key Laboratory for Bio‑Medical ResearchSoutheast UniversityNanjing 210096China Department of Psychiatry Affiliated Hangzhou First People’s HospitalZhejiang University school of MedicineHangzhou 310030China Department of Otolaryngology Head and Neck Surgery Affiliated Drum Tower Hospital of Nanjing University Medical SchoolJiangsu Provincial Key Medical Discipline(Laboratory)NanjingChina Research Institute of Otolaryngology Nanjing 210008China Department of Otolaryngology Head and Neck Surgery Sichuan Provincial People’s HospitalUniversity of Electronic Science and Technology of ChinaChengdu 610072China Co‑Innovation Center of Neuroregeneration Nantong UniversityNantong 226001China Institute for Stem Cell and Regeneration Chinese Academy of ScienceBeijing 101408China Beijing Key Laboratory of Neural Regeneration and Repair Capital Medical UniversityBeijing 100069China

Hearing loss and deafness,as a worldwide disability disease,have been troubling human ***,the auditory organ of the inner ear is highly heterogeneous and has a very limited number of cells,which are largely uncharacterized in ***,with the development and utilization of single-cell RNA sequencing(scRNA-seq),researchers have been able to unveil the complex and sophisticated biological mechanisms of various types of cells in the auditory organ at the single-cell level and address the challenges of cellular heterogeneity that are not resolved through by conventional bulk RNA sequencing(bulk RNAseq).Herein,we reviewed the application of scRNA-seq technology in auditory research,with the aim of providing a reference for the development of auditory organs,the pathogenesis of hearing loss,and regenerative *** about spatial transcriptomic scRNA-seq,single-cell based genome,and Live-seq technology will also be discussed.

关键词： Single-cell RNA sequencing Inner ear Cochlear Auditory sensory epithelium Spiral ganglion neuron

Exploring the Cation Regulation Mechanism for Interfacial Water Involved in the Hydrogen Evolution Reaction by In Situ Raman Spectroscopy

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Nano-Micro Letters 2024年第3期16卷 303-312页

作者： Xueqiu You Dongao Zhang Xia‑Guang Zhang xiangyu Li Jing‑Hua tian Yao‑Hui Wang Jian‑Feng Li School of Ocean Information Engineering Fujian Provincial Key Laboratory of Oceanic Information Perception and Intelligent ProcessingJimei UniversityXiamen 361021People’s Republic of China State Key Laboratory of Physical Chemistry of Solid Surfaces MOE Key Laboratory of Spectrochemical Analysis and InstrumentationiChEMCollege of Chemistry and Chemical EngineeringCollege of MaterialsCollege of EnergyXiamen UniversityXiamen 361005People’s Republic of China Key Laboratory of Green Chemical Media and Reactions Ministry of EducationCollaborative Innovation Center of Henan Province for Green Manufacturing of Fine ChemicalsCollege of Chemistry and Chemical EngineeringHenan Normal UniversityXinxiang 453007People’s Republic of China Innovation Laboratory for Sciences and Technologies of Energy Materials of Fujian Province(IKKEM) Xiamen 361005People’s Republic of China

Interfacial water molecules are the most important participants in the hydrogen evolution reaction(HER).Hence,understanding the behavior and role that interfacial water plays will ultimately reveal the HER ***,investigating interfacial water is extremely challenging owing to the interference caused by bulk water molecules and complexity of the interfacial ***,the behaviors of interfacial water in different cationic electrolytes on Pd surfaces were investigated by the electrochemistry,in situ core-shell nanostructure enhanced Raman spectroscopy and theoretical simulation *** spectral evidence reveals a red shift in the frequency and a decrease in the intensity of interfacial water as the potential is shifted in the positively *** comparing the different cation electrolyte systems at a given potential,the frequency of the interfacial water peak increases in the specified order:Li+

关键词： In situ Raman Interfacial water Hydrogen evolution reaction Cations

C反应蛋白与白蛋白及其比值对冠状动脉造影术后造影剂肾病的预测价值

在线全文

学校读者我要写书评

暂无评论

社区医学杂志 2024年第9期22卷 295-300页

作者：田香玉周新玲王子龙高云张焕轶尹鲁骅周发展山东第一医科大学(山东省医学科学院)研究生部山东济南250117 青岛大学附属泰安市中心医院消化内科山东泰安271000 青岛大学附属泰安市中心医院心内科山东泰安271000 青岛大学附属泰安市中心医院教育科山东泰安271000

目的探究C反应蛋白(CRP)、白蛋白(ALB)以及两者间比值(CAR)对急性冠状动脉综合征(ACS)患者行冠状动脉造影(CAG)术后发生的造影剂肾病(CIN)的早期预测价值。方法选取2019-12-01-2022-03-30在泰安市中心医院心内科住院行CAG手术的ACS患者... 详细信息

目的探究C反应蛋白(CRP)、白蛋白(ALB)以及两者间比值(CAR)对急性冠状动脉综合征(ACS)患者行冠状动脉造影(CAG)术后发生的造影剂肾病(CIN)的早期预测价值。方法选取2019-12-01-2022-03-30在泰安市中心医院心内科住院行CAG手术的ACS患者为研究对象。入院后完善相关检查,收集患者的一般资料,以及CRP、ALB血清浓度。分别抽取患者CAG术前及术后48和72h肘静脉血并检测血肌酐值,根据CIN诊断标准,将患者分为CIN组(n=50)和非CIN组(n=591)。比较2组患者相关检测指标是否有统计学意义,分析各项指标与CIN发生的相关性,绘制受试者工作特征(ROC)曲线,并评估CAR对CIN发生的早期预测价值。结果CIN发病率为7.8%(50/641),CIN组CRP(Z=0.007,P<0.001)、ALB(Z=0.003,P<0.001)、CAR(Z=0.005,P<0.001)水平高于非CIN组,差异有统计学意义。Spearman相关分析结果显示,CAG术后CIN的发生与CRP(r=0.493,P<0.001)、CAR(r=0.279,P<0.001)的水平呈正相关,与ALB(r=-0.335,P<0.001)的水平呈负相关。logistic回归分析结果显示,CRP(OR=1.288,P<0.001,95%CI:1.170~1.417)、CAR(OR=0.234,P=0.026,95%CI:0.065~0.839)和ALB(OR=0.634,P<0.001,95%CI:0.539~0.747)是预测CAG术后CIN发生的独立危险因素。ROC曲线结果显示,CRP曲线下面积为0.934,截断点为6.15,灵敏度为96.0%,特异度为74.5%;ALB曲线下面积0.930,截断点为39.45,灵敏度为88.3%,特异度为86.0%;CAR曲线下面积为0.968,截断点为0.21,灵敏度为94.0%,特异度88.5%。结论CAR可作为早期预测CAG术后CIN发生的血清标志物,且具有较高的灵敏度及特异度。

关键词： C反应蛋白白蛋白 C反应蛋白/白蛋白造影剂肾病冠状动脉造影

A novel method corrected multipath error oriented the oceanic buoy

在线全文

学校读者我要写书评

暂无评论

A novel method corrected multipath error oriented the oceani...

Modeling and Simulation of Power Coupling System in Hydraulic Hybrid City Bus

第十三届中国卫星导航年会

作者： xiangyu tian Hongzhou Chai Institute of Surveying and Mapping Information Engineering University

The signals always form the reflection over the sea. The characteristics and correct method of the multipath over the sea are worthy of research. Based on the assumption that the high-precision posterior residual only contains multipath error and noise, this paper adopts forward and backward filtering estimation and PPP-AR strategy to obtain the high-precision observational post-residual and then calculates the multipath error effect based on the mean denoising method. The azimuth and elevation angle mapping relationship of the azimuth angle and elevation angle are constructed, the station center multipath hemispherical map（MHM） is constructed, and the different grid resolutions of MHM are experimentally studied. The experimental results show that the MHM model can effectively improve the positioning effect of the marine buoy rather than no multipath correction. Not only the positioning accuracy can be improved, but the ambiguity fixed-rate and convergence time of positioning can also be improved, especially the 2°×2° resolution of the MHM model has good results in both static and dynamic scenarios.

关键词： BDS oceanic buoy multipath precise positioning

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

Energy and Power Engineering 2014年第6期6卷 119-132页

作者： Xunming Li Jinyu Qu Wei Wei xiangyu tian School of Transport and Vehicle Engineering Shandong University of Technology Zibo China

In order to solve the coupling problem of power in Hydraulic Hybrid City Bus (HHB), a hydraulic hybrid power coupling system based on planetary gear transmission principle is proposed in this paper. The system consists of diesel engine, power coupler, hydraulic pump/motor, etc. The realizable operating modes of power coupling system are analyzed in this paper. Under coordination of clutches, the engine driven mode, hydraulic driven mode, hybrid driven mode, hydraulic engine-start mode and braking energy recovery mode are realizable. Based on Lagrange equation, kinetic analysis and kinematics analyses are presented. In addition, the simulation model of the power coupling system is proposed, which includes diesel engine model, power coupler model, hydraulic pump/motor model, etc. The example simulation analysis is proposed under the hybrid driven mode;the results show that the power coupling system proposed in this paper can realize power coupling of hydraulic hybrid city bus. Compared with traditional city bus, the hydraulic hybrid city bus can choose small-displacement engine so as to improve fuel economy and dynamic property.

关键词： HHB Power Coupling System Planetary Gear Trans Hydraulic Starting

Coherent terahertz wave emission from laser-induced plasma in isotropic transparent solid dielectrics

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chinese Optics Letters 2024年第7期22卷 121-125页

作者： Yuxuan Chen Yuhang He Chenyin Dai xiangyu La Zhen tian Jianming Dai Center for Terahertz Waves and School of Precision Instrument and Opto-electronics Engineering Tianjin UniversityTianjin 300072China

In this Letter,we employ fused silica and two types of optical glass as examples to investigate the coherent terahertz(THz)wave emission from laser-ionized isotropic transparent *** on the laser energy and incident angle dependences,we ascribe the THz emission to the ponderomotive force-induced dipole ***,our investigation on the dependence of THz amplitude on the laser pulse duration confirms the dominant role of avalanche ionization in solid *** THz emission can be utilized to indirectly monitor the ultrafast dynamics of carrier generation and motion during the laser ionization process of solid dielectrics.

关键词： terahertz wave emission laser-induced plasma laser-solid interaction ponderomotive force fused silica.

Core-shell nanoparticle enhanced Raman spectroscopy in situ probing the composition and evolution of interfacial species on PtCo surfaces

在线全文

学校读者我要写书评

暂无评论

Nano Research 2024年第6期17卷 4687-4692页

作者： Jing Liu Han-Liang Zhong xiangyu Li Mu-Fei Yue Wei-Min Yang Xueqiu You Jing-Hua tian Yao-Hui Wang Jian-Feng Li Fujian Provincial Key Laboratory of Oceanic Information Perception and Intelligent Processing School of Ocean Information EngineeringJimei UniversityXiamen 361021China College of Chemistry Fuzhou UniversityFuzhou 350108China State Key Laboratory of Physical Chemistry of Solid Surfaces MOE Key Laboratory of Spectrochemical Analysis and InstrumentationiChEMCollege of Chemistry and Chemical EngineeringCollege of MaterialsCollege of EnergyXiamen UniversityXiamen 361005China Innovation Laboratory for Sciences and Technologies of Energy Materials of Fujian Province(IKKEM) Xiamen 361005China Shenzhen Research Institute of Xiamen University Shenzhen 518000China

The composition and evolution of interfacial species play a key role during electrocatalytic *** the structural evolution and intermediate during catalytic process by in situ characterization can shed new light on the electrocatalytic reaction mechanism and develop highly efficient ***,directly probing the interfacial species is extremely difficult for most spectroscopic techniques due to complicated interfacial environment and ultra-low surface ***,electrochemical core-shell nanoparticle enhanced Raman spectroscopy is utilized to probe the composition and evolution processes of interfacial species on Au@Pt,Au@Co,and Au@PtCo core-shell nanoparticle *** spectral evidences of interfacial intermediates including hydroxide radical(OH*),superoxide ion(O_(2)^(−)),as well as metal oxide species are directly captured by in situ Raman spectroscopy,which are further confirmed by the both isotopic experiment and density functional theory *** results provide a mechanistic guideline for the rational design of highly efficient electrocatalysts.

关键词： in situ Raman core-shell nanoparticle PtCo interfacial species composition and evolution

Inactivated H9N2 vaccines developed with early strains do not protect against recent H9N2 viruses:Call for a change in H9N2 control policy

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Integrative Agriculture 2024年第6期23卷 2144-2148页

作者： Yanjing Liu Qingqing Yu xiangyu Zhou Wenxin Li Xinwen He Yan Wang Guohua Deng Jianzhong Shi Guobin tian Xianying Zeng Hualan Chen College of Veterinary Medicine Gansu Agricultural UniversityLanzhou 730070China State Key Laboratory for Animal Disease Control and Prevention Key Laboratory for Prevention and Control of Avian Influenza and Other Major Poultry DiseasesMinistry of Agriculture and Rural Affairs/Harbin Veterinary Research InstituteChinese Academy of Agricultural SciencesHarbin 150009China National Poultry Laboratory Animal Resource Center Harbin Veterinary Research InstituteChinese Academy of Agricultural SciencesHarbin 150009China Harbin Weike Biotechnology Co. Ltd.Harbin 150009China

H9N2 virus has been widely distributed in wild birds and poultry around the world since its first emergence in the United States of America in 1966(Gu et al.2017;Carnaccini and Perez 2020).The virus appeared in chickens in China in the early 1990s,and over the last two decades has gradually become the dominant epidemic subtype(Sun and Liu 2015;Bi et al.2020).Although H9N2 virus infection alone cannot cause severe disease or death in poultry,H9N2 virus-infected birds experience a degree of egg production drop and can be easily infected by other pathogens,thus causing economic losses for poultry industry.

关键词： H9N2 poultry policy