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Degradable magnesium alloy suture promotes fibrocartilaginous interface regeneration in a rat rotator cuff transosseous repair model

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Journal of Magnesium and Alloys 2024年第1期12卷 384-393页

作者： baoxiang zhang Wen zhang Fei zhang Chao Ning Mingyang An Ke Yang Lili Tan Qiang zhang Department of Sports Medicine Chinese PLA General HospitalBeijing 100853China Shi-changxu Innovation Center for Advanced Materials Institute of Metal ResearchChinese Academy of SciencesShenyang 110016China School of Materials Science and Engineering University of Science and Technology of ChinaShenyang 110016China Medical School of PLA Beijing 100853China Institute of Orthopedics Chinese PLA General HospitalBeijing Key Lab of Regenerative Medicine in OrthopedicsKey Lab of Musculoskeletal Trauma&War Injuries of Chinese PLABeijing 100853China

Despite transosseous rotator cuff tear repair using sutures is widely accepted for tendon-bone fixation,the fibrocartilaginous enthesis regeneration is still hardly achieved with the traditional *** the present work,degradable magnesium(Mg)alloy wire was applied to suture supraspinatus tendon in a rat acute rotator cuff tear model with Vicryl Plus 4±0 absorbable suture as *** shoulder joint humerus-supraspinatus tendon complex specimens were retrieved at 4,8,and 12 weeks after *** Mg alloy suture groups showed better biomechanical properties in terms of ultimate load to *** observation showed that hyperplastic response of the scar tissue at the tendon-bone interface is progressively alleviated over time in the both Mg alloy suture and Vicryl suture *** the histological analysis,for Mg alloy suture groups,chondrocytes appear to proliferate at 4 weeks postoperatively,and the tendon-bone interface showed an orderly structural transition zone at 8 weeks *** collagenous fiber tended to be aligned and the tendon-bone interlocking structures apparently formed,where transitional structure from unmineralized fibrocartilage to mineralized fibrocartilage was closer to the native fibrocartilaginous *** vivo degradation of the magnesium alloy wire was completed within 12 *** results indicated that Mg alloy wire was promising as degradable suture with the potential to promotes fibrocartilaginous interface regeneration in rotator cuff repair.

关键词： Rotator cuff repair Mg alloy wire Tendon-bone healing Fibrocartilaginous interface

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Design of graph computing accelerator based on reconfigurable PE array

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The Journal of China Universities of Posts and Telecommunications 2024年第5期31卷 49-63+70页

作者： Deng Junyong Jia Yanting zhang baoxiang Kang Yuchun Lu Songtao School of Electronic Engineering Xi'an University of Posts and Telecommunications

Due to the diversity of graph computing applications, the power-law distribution of graph data, and the high compute-to-memory ratio, traditional architectures face significant challenges regarding poor flexibility, imbalanced workload distribution, and inefficient memory access when executing graph computing tasks. Graph computing accelerator, GraphApp, based on a reconfigurable processing element(PE) array was proposed to address the challenges above. GraphApp utilizes 16 reconfigurable PEs for parallel computation and employs tiled data. By reasonably dividing the data into tiles, load balancing is achieved and the overall efficiency of parallel computation is enhanced. Additionally, it preprocesses graph data using the compressed sparse columns independently(CSCI) data compression format to alleviate the issue of low memory access efficiency caused by the high memory access-to-computation ratio. Lastly, GraphApp is evaluated using triangle counting(TC) and depth-first search(DFS) algorithms. Performance analysis is conducted by measuring the execution time of these algorithms in GraphApp against existing typical graph frameworks, Ligra, and GraphBIG, using six datasets from the Stanford Network Analysis Project(SNAP) database. The results show that GraphApp achieves a maximum performance improvement of 30.86% compared to Ligra and 20.43% compared to GraphBIG when processing the same datasets.

关键词： graph computing reconfigurable accelerator parallel computing triangle counting(TC)algorithm depth-first search(DFS)algorithm

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Simultaneous Inversion of Earthquake Relocation and Velocity Structure in the Shanxi-reservoir,Wenzhou

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Earthquake Research in China 2011年第4期25卷 468-476页

作者： Zhong Yuyun zhang Zhenfeng Kan baoxiang Earthquake Administration of Zhejiang Province Hangzhou 310013 China

Using the data of P-wave network and Zhejiang and travel time recorded at the Shanxi-reservoir seismological Fujian local networks, we implemented a simultaneous inversion of earthquake relocation and velocity structure and determined the new locations of earthquakes in the Shanxi-reservoir. The results show that：（1） the overall epicenter distribution is NW directed, and the Shanxi reservoir induced seismicity has a close relationship to the Shuangxi-Jiaoxiyang fault; （2） the focal depth of the Shanxi reservoir induced seismicity is 5.4km in average, less than the average focal depth in the South China earthquake zone; （3） the focal depth is shallower on the reservoir shore and deeper in the reservoir inundation area. At the beginning of the reservoir induced seismicity, the focal depth increased gradually. This may be due to the gradual penetration of water into a larger depth that induced deeper earthquakes; and （4） there is a low P-wave velocity anomaly in the study area, located at the intersection of multiple faults in the reservoir inundation area. The Shanxi reservoir induced seismicity mostly occurred in this lowvelocity anomaly zone. This may be related to water penetration.

关键词： Shanxi reservoir Velocity structure Simultaneous inversion Earthquake location

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System Dynamics Modeling for Sustainable Water Management of a Coastal Area in Shandong Province, China

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Journal of Earth Science and Engineering 2016年第4期6卷 226-234页

作者： Qin Huanhuan zhang baoxiang Meng Fanhai Institute of Water Sciences and College of Engineering Peking University Beijing 100871 China Water Resources Research Institute of Shandong Province Jinan 250013 Shandong China Water Bureau of Longkou City Longkou 265701 Shandong China

Water is one of the basic materials in human existence and the development of society and economy. Its sustainable management has always been an eternal subject for the management of human society and also a complex systemic problem. How to take advantages of water has been a big event in such an agricultural country like China. As economically developed areas, coastal areas are facing water shortage problems due to the rapid economic and social development and inappropriate and unsustainable water management measures. To fully understand and study such problems faced by the coastal areas needs a systematic and integrated framework to consider the various social-economic, natural and engineering factors that affect the sustainable development of water in those areas. The SD （system dynamics） methodology, which is an approach that has been successfully used in solving complex systematic problems in general, and in solving water management problems in particular for more than 50 years, was applied to a typical coastal area, Longkou City in Shandong Province of China, to study and analyze the future sustainable water management of this city. Then the quantitative modeling and analysis of the water development were carried out through scenario analysis. Four different scenarios （business as usual, economic development, water resources protection, and comprehensive） were designed by changing the values of decision-making variables. The total water demand in 2030 of these four scenarios are 0.455 billion m3, 0.793 billion m3, 0.412 billion m3 and 0.487 billion m3, respectively; the corresponding water deficit of these scenarios are 0.292 billion m3, 0.634 billion m3, 0.254 billion m3 and 0.329 billion m3, respectively. The comparison results indicated that the comprehensive scenario is the optimal one among these designed scenarios. To totally solve the water shortage problem with the economy developed in Longkou City needs to take more effective measures to reduce water

关键词： Sustainable water management coastal areas system dynamics scenario analysis

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Precipitation Behavior and Microstructure Evolution of Mg-Zn-Zr-Er Alloy Processed by Secondary Deformation and Heat Treatment

Precipitation Behavior and Microstructure Evolution of Mg-Zn...

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中国材料大会2012

作者： baoxiang zhang Jing zhang School of Material Science and Engineering Chongqing University National Engineering Research Center for Magnesium Alloys

ISBN: (纸本)9783037856086

Preheated at 673K for 3h and 6h respectively, as-extruded Mg-9Zn-0.6Zr-2Er （wt.%） slabs with starting thickness of 8mm were hot-rolled at 673K to 2mm. The hot-rolled alloys were then solution treated at 673K for1.5h and aged at 473K for 10h. Microstructure evolution and second phase precipitation behavior during hot rolling and subsequent heat treatments were examined by optical microscopy （OM）, scan electron microscopy （SEM） and micro hardness test. Mg-9Zn-0.6Zr-2Er alloy were fully recrystallized with fine equiaxed grains after preheating for 3 hours, prolonging heating time leads to a higher degree of dissolution of secondary phase into Mg matrix but a coarsening of the microstructure. During hot rolling process, the volume fraction of the DRX grains increased gradually with increasing reduction ratio, shearing bands became visble in the final pass. Thermal stable Mg-Zn-Er intermetallic compounds distributed along rolling direction at the first rolling passes and became more homogenous in the final pass. More nano-sized MgZn2 precipitated during hot rolling in the alloy preheated for 6h than that for 3h, leading to an enhanced precipitation hardening effect in the former.

关键词： Mg-Zn-Zr-Er alloy Precipitates Secondary deformation

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欧洲统一大市场:进展与前景

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现代国际关系 1989年第3期 33-39,64-65页

作者：张宝祥

欧洲共同体关于在1992年建立欧洲统一大市场的决定在世界范围内引起强烈反响。西欧为之振奋,美、日忧虑不安,东欧积极向西欧靠拢,苏联心情矛盾,广大第三世界国家则喜忧掺半。世界各国都在积极认真地准备迎接西欧的挑战。一场世界规模的... 详细信息

欧洲共同体关于在1992年建立欧洲统一大市场的决定在世界范围内引起强烈反响。西欧为之振奋,美、日忧虑不安,东欧积极向西欧靠拢,苏联心情矛盾,广大第三世界国家则喜忧掺半。世界各国都在积极认真地准备迎接西欧的挑战。一场世界规模的经济贸易战正在展开。

关键词：欧洲共同体统一大市场欧洲大市场西欧联合欧洲货币单位增值税西欧经济市场建设第三世界国家建立

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基于Harris-SIFT算法和全卷积深度预测的显微镜成像的三维重建研究

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光学精密工程 2022年第14期30卷 1669-1681页

作者：张宝祥玉振明杨秋慧广西大学计算机与电子信息学院广西南宁530004 梧州学院机器视觉与智能控制广西重点实验室广西梧州543002 梧州学院大数据与软件工程学院广西梧州543002

针对珠宝、矿物和金属样本等立体标本在显微镜局部放大观测时存在弱纹理、反光等问题,本文提出了一种适用于显微镜应用场景下基于特征提取的多视图立体三维重建算法。将显微镜镜头角度固定,通过移动载物台对立体标本进行多角度成像获得... 详细信息

针对珠宝、矿物和金属样本等立体标本在显微镜局部放大观测时存在弱纹理、反光等问题,本文提出了一种适用于显微镜应用场景下基于特征提取的多视图立体三维重建算法。将显微镜镜头角度固定,通过移动载物台对立体标本进行多角度成像获得图像序列。通过将Harris与SIFT算法的优势相结合将原本SFM方法重建中的SIFT算法改进为Harris-SIFT算法进行特征提取与匹配,提升了对显微图像在弱纹理区域特征信息提取的性能。通过使用与深度残差网络相结合的全卷积神经网络对输入的图像进行深度估计和预测,将预测的深度信息通过阈值法与MVS深度图相融合,对MVS深度图进行修正,重建出物体的稠密点云,提升了重建结构完整性并提取到更多的点云数目。在基恩仕VHX-6000数码显微系统进行实验表明,本算法比原始MVS重建算法重建的点云模型点云数目多31.25%,整体重建时间节省了21.16%。

关键词：显微镜三维重建特征检测深度估计 MVS深度图

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往复泵输液管道结构振动有限元法分析

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机械工程学报 1999年第6期35卷 74-76页

作者：闫祥安郑炜张青鲁宝香天津大学机械工程学院天津300072

泵的往复运动导致输液管道受多频率谐波激励。用有限元方法，建立管网系统结构振动分析模型，求得固有频率和振型分布，给出有工程实用价值的管道减振、消振的设计原则。

关键词：往复泵有限元结构振动输液管道泵

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Overall-effective Measures for Sustainable Water Resources Management in the Coastal Areas of Shandong Province, China——Case Study: the Huangshuihe River Catchment of Longkou City

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Journal of Ocean University of China 2006年第4期5卷 339-344页

作者： zhang baoxiang W. F. Geiger S. Kaden R. Kutzner WANG Zengliang Water Conservancy Research Institute of Shandong Province Jinan 250013 P.R. China Urban Water Management Department of Civil Engineering University of Essen 45141 Essen Germany WASY Institute for Water Resources Planning and Systems Research Ltd. 12526 Berlin Germany Water Affair Bureau of Longkou City Longkou 265701 P.R. China

In the coastal catchments of Shandong Province the water scarcity is aggravated due to saltwater intrusion, reducing the usability of water resources available. Such a situation calls for sustainable integrated water resources management (IWRM). The idea for the objectives and implementation of the IWRM are explained in this paper. The general objective of the planned project disscussed in the present study is to bring together German traditional expertise in water resources management and newer developments in the context of the European Water Framework Directive; the research efforts aim to relieve the desperate water scarcity situation in the costal area of Shandong Province.

关键词： water resources sustainable management IWRM coastal area

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水文地球化学方法在地下水研究中的应用综述

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人民黄河 2019年第10期41卷 135-142页

作者：张保祥张超山东省水利科学研究院吉林大学新能源与环境学院

水文地球化学方法在研究地下水方面已有了长足发展,特别是同位素和热力学基本原理方法的应用,解决了定量、半定量的水文地球化学的实际问题,使得水文地球化学研究地下水的方法更加严谨、完善。主要介绍了地下水水化学研究中用到的水文... 详细信息

水文地球化学方法在研究地下水方面已有了长足发展,特别是同位素和热力学基本原理方法的应用,解决了定量、半定量的水文地球化学的实际问题,使得水文地球化学研究地下水的方法更加严谨、完善。主要介绍了地下水水化学研究中用到的水文地球化学方法以及有关水化学分析的常用软件。水文地球化学研究方法按照其应用技术可分为地质学法、同位素法以及热力学法,其中:地质学方法又分为水化学类型法、多元统计方法、离子比例系数分析法;水文地质学中常用的是氢元素的同位素,包括氢氧稳定同位素、碳同位素、硫同位素等;热力学方法可用来判断地下水系统在进行水岩作用时可能发生的化学反应,同时根据热力学原理可进行水文地球化学模拟过程的研究。通过对现今水文地球化学研究中所使用的方法、技术以及国内外应用情况的总结、分析,力图相对全面地认识当前水文地球化学研究方法的发展历程及未来趋势。

关键词：地下水水文地球化学水化学地质学同位素热力学软件

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