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Review of cylinder block/valve plate interface in axial piston pumps: Theoretical models,experimental investigations, and optimal design

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Chinese Journal of Aeronautics 2021年第1期34卷 111-134页

作者： jiang'ao zhao Yongling FU Jiming MA Jian FU Qun CHAO Yan WANG School of Mechanical Engineering and Automation Beihang UniversityBeijing 100191China Laboratory of Aerospace Servo Actuation and Transmission Beihang UniversityBeijing 100191China State Key Laboratory of Mechanical System and Vibration Shanghai Jiao Tong UniversityShanghai 200240China

Axial piston pumps have been widely used in aircraft hydraulic systems to supply the system with pressurized fluid. The continuous improvement of the aircraft performance has put forward the demand on aviation piston pumps for high power density, safety, and reliability. The lubricating interfaces in axial piston machines are the key design issue that greatly determines the pump performance and service life. The cylinder block/valve plate interface is one of these critical lubricating interfaces and has received considerable attention from many researchers in the last half century. This study aims to review the state-of-the-art literature on the cylinder block/valve plate interface comprehensively and systematically. First, we introduce various theoretical models developed to investigate the lubrication behaviors of the interface and compare them in terms of their assumptions and limitations. Second, the experimental studies on the cylinder block/valve plate interface are presented comprehensively, where the involved test rigs are divided into three types according to their fidelity levels and measurement functionality. Third, we summarize some typical approaches of structure optimization, surface shaping, and surface strengthening, which help improve the load-carrying and anti-wear capacities of the interface under severe operating conditions. Finally, the challenges and future trends of the cylinder block/valve plate interface research are discussed briefly.

关键词： Axial piston pump Cylinder block/valve plate interface Theoretical model Test rig Optimization methods

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The In-plane Orientation and Thermal Mechanical Properties of the Chemically Imidized Polyimide Films

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Chinese Journal of Polymer Science 2019年第3期37卷 268-278页

作者： Zhen-He Wang Xing Chen Hai-Xia Yang jiang zhao Shi-Yong Yang Laboratory of Advanced Polymer Materials Institute of Chemistry Chinese Academy of Sciences University of Chinese Academy of Science State Key Laboratory of Polymer Physics and Chemistry Institute of Chemistry Chinese Academy of Sciences Department of Polymer Science The University of Akron

The thermal and mechanical properties of the chemically imidized polyimide(CIPI) films and thermally imidized polyimide(TIPI) films were investigated systematically. Experimental results indicated that the CIPI films show dramatically enhanced tensile strength and modulus with obviously reduced coefficient of thermal expansion(CTE) in comparison with TIPI films. These enhancements results from the high in-plane orientation and close packing of the CIPI backbones. Compared with thermal imidization which starts at about 140 °C, the chemical imidization activated by acetic anhydride and isoquinoline initiates the cyclization even at room *** resulting imide rings restrict the mobility of polymer chains and lead to the in-plane orientation with solvent ***, fewer small molecules remain in the films after treated at 120 °C by chemical imidization than by thermal imidization. The polymer chain plasticization caused by the evaporation of small molecules at high temperature is obviously restricted. Moreover, the partially imidized polymer inhibits the decomposition of mainchains that occurs at subsequent high temperature process, being beneficial to the formation of high molecular weight PI films. Hence, chemical imidization pathway shows apparent advantage to produce PI films with great combined properties, including high modulus, strength and toughness, as well as high thermal dimension stability etc.

关键词： Polyimide film Chemical imidization Thermal imidization In-plane orientation CTE

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Integrating the second near-infrared fluorescence imaging with clinical techniques for multimodal cancer imaging by neodymiumdoped gadolinium tungstate nanoparticles

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Nano Research 2021年第7期14卷 2160-2170页

作者： Xujiang Yu Aodenggerile zhao jiang Jianliang Shen Zhiqiang Yan Wanwan Li Huibin Qiu Joint Research Center for Precision Medicine Shanghai Jiao Tong University Affiliated Sixth People’s Hospital South CampusSouthern Medical University Affiliated Fengxian HospitalShanghai 201499China School of Chemistry and Chemical Engineering Frontiers Science Center for Transformative MoleculesState Key Laboratory of Metal Matrix CompositeShanghai Jiao Tong UniversityShanghai 200240China State Key Laboratory of Metal Matrix Composites School of Materials Science and EngineeringShanghai Jiao Tong UniversityShanghai 200240China State Key Laboratory of Ophthalmology Optometry and Vision ScienceSchool of Ophthalmology and OptometrySchool of Biomedical EngineeringWenzhou Medical UniversityWenzhou 325027China Engineering Research Center of Clinical Functional Materials and Diagnosis&Treatment Devices of Zhejiang Province Wenzhou InstituteUniversity of Chinese Academy of SciencesWenzhou 325001China

Second near-infrared(NIR-II)fluorescence imaging is a recently emerged technique and is highly useful for accurate diagnosis of *** a diverse array of fluorescent nanomaterials have been developed to enable NIR-II fluorescence in various situations,they normally fail to unify the clinical techniques,such as computed tomography(CT)and magnetic resonance imaging(MRI).Therefore,exploiting multimodal agents to integrate the newly emerged NIR-II fluorescence and traditional clinical techniques would be of key ***,we report a rational fabrication of neodymium(Nd)-doped gadolinium tungstate nanoparticles(NPs)that are subsequentially decorated with a hydrophilic layer and demonstrate that they can achieve the harmonious integration of NIR-II fluorescence imaging,CT,and *** NIR-II fluorescence emission was activated by an incident light with discrete wavelength ranging from 250 to 810 ***-II fluorescence-CT-MRI associated trimodal imaging was subsequently demonstrated for breast cancer by an 808 nm laser,along with the estimation of NIR-II fluorescence imaging for cervical *** integration of newly emerged and traditional clinical imaging techniques highlights the huge potential of rare-earth-doped NPs for multimodal imaging of different types of cancer.

关键词： rare-earth-doped nanoparticles(NPs) second near-infrared fluorescence multimodal imaging cancer

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维立西呱联合重组人脑利钠肽治疗HFrEF伴心房颤动的临床效果研究

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海南医学 2024年第16期35卷 2309-2315页

作者：朱揆赵江涛李家驹郑州大学第一附属医院心血管内科河南郑州450000

目的研究维立西呱联合重组人脑利钠肽治疗射血分数降低的心力衰竭(HFrEF)伴心房颤动的临床效果。方法本研究为回顾性研究,根据治疗方案不同按1:1配对原则将2022年8月至2023年7月郑州大学第一附属医院收治的124例HFrEF伴心房颤动患者分... 详细信息

目的研究维立西呱联合重组人脑利钠肽治疗射血分数降低的心力衰竭(HFrEF)伴心房颤动的临床效果。方法本研究为回顾性研究,根据治疗方案不同按1:1配对原则将2022年8月至2023年7月郑州大学第一附属医院收治的124例HFrEF伴心房颤动患者分为对照组和研究组各62例。两组患者均行常规治疗,对照组另给予重组人脑利钠肽治疗,研究组则给予维立西呱联合重组人脑利钠肽治疗,均持续治疗6个月。比较两组患者治疗6个月后的治疗效果,以及治疗前和治疗3个月、6个月后的心功能指标[左心室高峰充盈率(LVPER)、左室射血分数(LVEF)、左心室收缩末期内径(LVESD)]、心肌损伤相关指标[可溶性人基质裂解素(sST2)、N末端脑钠肽前体(NT-proBNP)、心肌肌钙蛋白Ⅰ(cTnⅠ)]、运动耐力[无氧域摄氧量(VO2AT)、峰值公斤摄氧量(VO_(2max))、最大运动负荷]、预后相关指标[半乳糖凝集素3(Gal-3)、胱抑素C(CysC)、Periostin蛋白、脂肪细胞型脂肪酸结合蛋白4(FABP4)],同时比较两组患者治疗期间的不良反应发生率和6个月内心力衰竭再入院率。结果治疗6个月后,研究组患者的临床总有效率为93.55%,明显高于对照组的80.65%,差异有统计学意义(P0.05)。结论维立西呱联合重组人脑利钠肽治疗HFrEF伴心房颤动疗效确切,安全性高,可减轻心肌损伤,改善心功能,提高运动耐力,预后良好。

关键词：重组人脑利钠肽维立西呱射血分数降低心力衰竭心肌损伤心房颤动运动耐力预后

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Viscous Shock Wave to an Inflow Problem for Compressible Viscous Gas with Large Density Oscillations

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Acta Mathematicae Applicatae Sinica 2019年第1期35卷 129-157页

作者： Dong-fen BIAN Li-li FAN Lin HE Hui-jiang zhao School of Mathematics and Statistics Beijing Institute of Technology School of Mathematics and Computer Science Wuhan Polytechnic University Institute of Applied Mathematics Academy of Mathematics and Systems Science The Chinese Academy of Sciences School of Mathematics and Statistics Wuhan University Computational Science Hubei Key Laboratory Wuhan University

This paper is concerned with the inflow problem for one-dimensional compressible Navier-Stokes equations. For such a problem, Huang, Matsumura, and Shi showed in [4] that there exists viscous shock wave solution to the inflow problem and both the boundary layer solution, the viscous shock wave, and their superposition are time-asymptotically nonlinear stable provided that both the initial perturbation and the boundary velocity are assumed to be sufficiently small. The main purpose of this paper is to show that similar stability results still hold for a class of large initial perturbation which can allow the initial density to have large oscillations. The proofs are given by an elementary energy method and our main idea is to use the smallness of the strength of the viscous shock wave and the boundary velocity to control the possible growth of the solutions induced by the nonlinearity of the compressible Navier-Stokes equations and the inflow boundary *** key point in our analysis is to deduce the desired uniform positive lower and upper bounds on the density.

关键词： compressible Navier-Stokes equations inflow problem viscous shock wave large density oscillations

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Bioinformatics and in vitro study reveal the roles of microRNA-346 in high glucose-induced human retinal pigment epithelial cell damage

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International Journal of Ophthalmology(English edition) 2023年第11期16卷 1756-1765页

作者： Peng Li Li Wang Qing Liu zhao-jiang Du Department of Ophthalmology Xijing 986 Hospital DepartmentFourth Military Medical UniversityXi’an 710054Shaanxi ProvinceChina Ophthalmology Teaching and Research Section of Institute of Medical Technology Xi’an Medical CollegeXi’an 710032Shaanxi ProvinceChina Department of Ophthalmology Xi’an Central HospitalXi’an 710001Shaanxi ProvinceChina

AIM:To study microRNAs(miRNAs)and their potential effects in high glucose-induced human retinal pigment epithelial cell ***:We screened the GSE52233 miRNA expression dataset for differentially expressed miRNAs(DEMs).The target genes of the top 10 DEMs were predicted using miRWalk 2.0 database,followed by function enrichment and protein-protein interaction *** expression was determined in the human retinal pigment epithelial cell line ARPE-19 treated with high glucose(HG)by quantitative reverse transcription-polymerase chain reaction(qRT-PCR).Cell proliferation was determined using cell counting kit(CCK)-8 *** cycle,apoptosis,and reactive oxygen species(ROS)levels were determined by flow *** direct interaction between miRNA and targets was validated using dual-luciferase reporter ***:Thirty-nine DEMs were screened,and we predicted 125 miRNA-mRNA pairs for the top 10 DEMs,including 119 target genes of seven DEMs such as miR-346,which was upregulated in diabetic retinopathy(DR).miR-346 target genes were substantially enriched in the regulation of intracellular transport and retinoic acidinducible gene I(RIG-I)-like receptor signaling *** of three upregulated and downregulated miRNAs were verified by qRT-PCR in HG-treated ARPE-19 *** of miR-346 was elevated in HG treated ARPE-19 cells in a dose-dependent *** inhibited cell proliferation and induced apoptosis,which were partly reversed by transfecting an miR-346 inhibitor,which even decreased the ROS levels elevated due to *** 2(AGO2)was a target of ***:miR-346 is a key miRNA and plays an important role in HG-induced damage in human retinal pigment epithelial cells.

关键词： miRNA miRNA-346 ARPE-19 bioinformatics analysis

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ELECTROSTATIC INTERACTION HYBRIDS FROM WATER-BORNE CONDUCTIVE POLYANILINE AND INORGANIC PRECURSOR CONTAINING CARBOXYL GROUP

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Chinese Journal of Polymer Science 2007年第2期25卷 181-186页

作者： Jing Luo Xian-hong Wang Ji Li Xiao-jiang zhao Fo-song Wang State Key Laboratory of Polymer Physicsand Chemistry Changchun Institute of Applied Chermstry Graduate School of Chinese Academy of Sciences Changchun 130022 China

Electrostatic interaction conductive hybrids were prepared in water/ethanol solution by the sol-gel process from inorganic sol containing carboxyl group and water-borne conductive polyaniline （cPANI）. The electrostatic interaction hybrids film displayed 1-2 orders of magnitude higher electrical conductivity in comparison with common hybrids film, showing remarkable conductivity stability against water soaking. Most strikingly, it displayed ideal electrochemical activity even in a solution with pH = 14, which enlarged the conducting polyaniline application window to strong alkaline media.

关键词： Water-borne conductive polyaniline Sol-gel Electrostatic interaction.

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One-Step Cutting of Multi-Walled Carbon Nanotubes Using Nanoscissors

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Nano-Micro Letters 2011年第2期3卷 86-90页

作者： jiang zhao Ping Liu Zhi Yang Peng Zhou Yafei Zhang Key Laboratory for Thin Film and Microfabrication of the Ministry of Education Research Institute of Micro/Nano Science and TechnologyShanghai Jiao Tong University Zhongyuan University of Technology

A novel,simple,and effective one-step method has been developed to cut the conventional long and entangled multi-walled carbon nanotubes(MWCNTs) with *** cutting process was carried out by the interactive collision of CNTs with the silicon carbide particles adhered on the abrasive *** final cut nanotubes have an average length of 200~300 *** statistical length distribution result indicates that cutting by this method achieves high cutting efficiency for short duration of 2 *** nanotubes are found to be easily dispersed into aqueous and ethanol *** cut MWCNTs/copper composite thin film fabricated by combined electrophoresis and electroplating techniques reveals that MWCNTs after cutting are well distributed and adhered to the Cu *** method is not only fast and efficient but also no chemical waste,which will expand many potential applications of CNTs.

关键词： Cutting MWCNTs Nanoscissors Dispersion

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Hot Rolled Strip Re-reddening Temperature Changing Law during Ultra-fast Cooling

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Journal of Iron and Steel Research International 2015年第8期22卷 694-702页

作者： Lian-yun jiang Chun-jiang zhao Jian-hui SHI Guo YUAN Xue-qiang WANG Qing-xue HUANG State Key Laboratory of Rolling and Automation Northeastern University School of Mechanical Engineering Taiyuan University of Science and Technology Shougang Qian'an Iron and Steel Co. Ltd.

Temperature deviation between surface and the center of hot rolled strip is formed during ultra-fast cooling （UFC）. Surface temperature would rise when temperature deviation goes up to an extent, and strip re-reddening phenomenon will appear. Strip re-reddening affects the stability of strip microstructure, property and temperature control precision. Thus, it is necessary to conduct research on re-reddening temperature changing law to improve strip property and temperature control precision. Strip temperature trends for various strip thicknesses and ultra-fast cooling rates were obtained by numerical calculation method. Re-reddening temperature, temperature deviation between surface and center, and boundary layer position changing law were obtained. By comparison, some conclusions were obtained： UFC re-reddening temperature and laminar cooling （LC） re-reddening temperature were linear to ultra-fast cooling rate respectively. Ultra-fast cooling rate affected UFC re-reddening temperature greatly, but it had little effect on LC re-reddening temperature. Equations which were used to calculate UFC re-reddening temperature, LC re-reddening temperature and maximum temperature deviation were obtained. The position of boundary layer stayed in 1/4 strip thickness.

关键词： ultra-fast cooling laminar cooling cooling rate re-reddening temperature

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八段锦对失地老年人城市适应性的影响

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黑龙江科学 2024年第7期15卷 26-29页

作者：王炜李浩男姜钊罗梦姣广西民族大学体育与健康科学学院南宁530000

随着我国城镇化进程的不断加快,失地农民中的特殊群体——失地老年人的城市适应性问题亟需研究。为探讨八段锦对失地老年人城市适应的干预效果,在泰安市迎宾社区招募30名失地老年人为调研对象,将其随机分为实验组(15名)与对照组(15名)... 详细信息

随着我国城镇化进程的不断加快,失地农民中的特殊群体——失地老年人的城市适应性问题亟需研究。为探讨八段锦对失地老年人城市适应的干预效果,在泰安市迎宾社区招募30名失地老年人为调研对象,将其随机分为实验组(15名)与对照组(15名)。实验组给予八段锦干预,每周3次,共12周,对照组保持原有的生活方式,比较两组的城市适应量表评分。研究发现,八段锦能够提升失地老年人的城市适应水平,特别是社会交往与城市适应总分。八段锦能够提升失地老年人的经济适应水平,但差异不具有统计学意义。八段锦体育参与能够帮助失地老年人建立新的的社会网络,客观上有利于其自身社会资本的累积,提高城市适应性。

关键词：八段锦体育参与城市适应失地老年人

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