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大型科研仪器共享策略——以气相色谱仪的在线租赁为例

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科技管理研究 2024年第10期44卷 116-124页

作者：吴静婷陈泽华陈冠廷张永王亚煦广东工业大学管理学院广东广州510520

为降低承租人的租赁成本、减轻科研机构在大型科研仪器购买方面的压力,如何有效利用大型科研仪器成为一个重要课题。目前在大型科研仪器租赁市场中,除租赁和采购之外,还有更多的租赁形式。结合当前共享经济的快速发展,考虑资本的时间价... 详细信息

为降低承租人的租赁成本、减轻科研机构在大型科研仪器购买方面的压力,如何有效利用大型科研仪器成为一个重要课题。目前在大型科研仪器租赁市场中,除租赁和采购之外,还有更多的租赁形式。结合当前共享经济的快速发展,考虑资本的时间价值,以气相色谱仪为例,从大型科研设备的租赁模式出发,对复利条件下大型科研仪器的二重在线租赁问题进行探讨,运用竞争分析法建立这一问题的竞争策略,并根据决策者对今后设备使用的长远期望对共享二重在线租赁问题进行了风险补偿分析;此外,运用算例分析解释利率、概率预期和风险容忍对最佳在线策略的影响。结果表明:在不同复利率的情况下,风险补偿策略的最佳决策时机存在差异;决策者预期成功获得的收益与风险容忍度呈正相关;在确定的风险容忍度下,概率预期的引入能够改善大型科研仪器在复利二重在线租赁问题的竞争比性能。

关键词：大型科研仪器共享经济二重在线租赁复利率竞争分析法气相色谱仪

共培养条件下肌卫星细胞C2C12对软骨细胞ATDC5活性的影响

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中医正骨 2024年第2期36卷 17-22,31页

作者：陈泽华王毅申震李俊毅欧梁株洲市中医伤科医院湖南株洲412007 广州中医药大学第五临床医学院广东广州510095 昆明市中医医院云南昆明650599 湖南省中医药研究院湖南长沙410006

目的:观察共培养条件下肌卫星细胞C2C12对软骨细胞ATDC5活性的影响。方法:①将肌卫星细胞C2C12分为对照组和地塞米松组,对照组常规培养,地塞米松组采用地塞米松干预,通过CCK8法和BCA法测定地塞米松对C2C12细胞增殖和蛋白合成的影响,以... 详细信息

目的:观察共培养条件下肌卫星细胞C2C12对软骨细胞ATDC5活性的影响。方法:①将肌卫星细胞C2C12分为对照组和地塞米松组,对照组常规培养,地塞米松组采用地塞米松干预,通过CCK8法和BCA法测定地塞米松对C2C12细胞增殖和蛋白合成的影响,以划痕实验和Transwell小室观察地塞米松对C2C12细胞修复和迁移能力的影响。②采用Transwell小室将正常肌卫星细胞C2C12(共培养组)和经地塞米松预处理的肌卫星细胞C2C12(预处理组)分别与软骨细胞ATDC5共培养,对照组Transwell下层小室内接种ATDC5细胞、上层小室内为无细胞的常规培养基,采用CCK8法和二氯二氢荧光素-乙酰乙酸酯荧光探针检测ATDC5细胞增殖率和细胞内活性氧含量。结果:①C2C12细胞增殖率和蛋白含量测定结果。地塞米松组C2C12细胞增殖率和蛋白含量均低于对照组[(78.402±5.401)%,(100.000±3.096)%,t=8.498,P=0.000;(5080.367±296.657)μg·mL-1,(5775.577±150.476)μg·mL-1,t=3.620,P=0.022]。②C2C12细胞伤口修复率测定结果。地塞米松组C2C12细胞伤口修复率低于对照组[(53.173±1.800)%,(79.979±10.176)%,t=4.493,P=0.011]。③C2C12细胞迁移数量测定结果。培养24 h和48 h时,地塞米松组C2C12细胞迁移数量均少于对照组[24 h:(24.200±5.630)个,(57.000±2.449)个,t=11.945,P=0.000;48 h:(57.600±8.820)个,(91.000±4.743)个,t=7.457,P=0.000]。④ATDC5细胞增殖率测定结果。3组ATDC5细胞增殖率比较,差异有统计学意义[(100.000±1.663)%,(116.894±7.917)%,(89.130±2.980)%,F=23.700,P=0.001]。对照组和共培养组ATDC5细胞增殖率均高于预处理组(P=0.037,P=0.006),共培养组ATDC5细胞增殖率高于对照组(P=0.001)。⑤ATDC5细胞内活性氧含量测定结果。3组ATDC5细胞内活性氧含量比较,差异有统计学意义(20.148±5.636,13.959±4.110,40.691±3.146,F=30.096,P=0.001)。预处理组ATDC5细胞内活性氧含量高于对照组和共培养组(P=0.001,P=0.000),对照组和共培养组ATDC5细胞内活性氧含量的差异无统计学意义(P=0.137)。结论:地塞米松可抑制肌卫星细胞C2C12增殖,应用地塞米松干预肌卫星细胞C2C12可体外模拟肌肉萎缩条件下肌卫星细胞的生长状态。正常状态下,肌卫星细胞C2C12的代谢产物可促进软骨细胞ATDC5增殖;肌卫星细胞C2C12活力降低,可抑制软骨细胞ATDC5增殖,同时会增加软骨细胞ATDC5氧化性损伤。

关键词：卫星细胞,骨骼肌软骨细胞骨关节炎肌萎缩共同培养技术

电针对周围神经损伤大鼠相应脊髓节段神经元铁死亡的影响

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中华手外科杂志 2024年第2期40卷 178-183页

作者：郝小倩张振伟李征余少校黄伟妮周望高陈泽华冼绍祥深圳市中西医结合医院手外科深圳518104 广州中医药大学第一附属医院骨科广州510080

目的研究电针对周围神经损伤大鼠相应脊髓节段神经元铁死亡的调控作用。方法将60只SPF级大鼠随机分为假手术组、模型组和电针组,每组20只。除假手术组大鼠以外,其余两组大鼠均建立坐骨神经损伤模型,造模后1 d在"环跳"和"委中"穴进行电... 详细信息

目的研究电针对周围神经损伤大鼠相应脊髓节段神经元铁死亡的调控作用。方法将60只SPF级大鼠随机分为假手术组、模型组和电针组,每组20只。除假手术组大鼠以外,其余两组大鼠均建立坐骨神经损伤模型,造模后1 d在"环跳"和"委中"穴进行电针干预,干预28 d后取材。观察大鼠坐骨神经功能改变和腓肠肌湿重恢复率,并采用HE染色观察坐骨神经和L4~L6节段脊髓神经元细胞形态和数量变化。采用PCR和Western Blot观察脊髓组织GPX4的mRNA和蛋白表达情况,采用铁离子浓度试剂盒检测脊髓组织铁离子浓度变化。结果与假手术组相比,造模后大鼠均出现坐骨神经功能下降和腓肠肌湿重恢复率降低。电针干预后,与模型组相比,电针组大鼠坐骨神经功能指数显著升高,腓肠肌湿重恢复率显著增加。与假手术组相比,模型组大鼠脊髓组织出现GPX4 mRNA和蛋白表达降低,铁离子浓度升高;与模型组相比,电针组大鼠脊髓组织GPX4 mRNA和蛋白表达升高,铁离子浓度降低。结论电针干预可以促进坐骨神经损伤大鼠神经功能恢复,同时电针对相应节段的脊髓神经元具有保护作用,作用机制与抗神经元细胞铁死亡有关。

关键词：周围神经神经元电针铁死亡

Learning group interaction for sports video understanding from a perspective of athlete

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Frontiers of Computer Science 2024年第4期18卷 175-188页

作者： Rui HE zehua FU Qingjie LIU Yunhong WANG Xunxun chen Intelligent Recognition and Image Processing(IRIP)Lab School of Computer Science and EngineeringBeihang UniversityBeijing 100191China Hangzhou Innovation Institute Behang UniversityHangzhou 310051China National Computer Network Emergency Response Technical Team/Coordination Center of China(CNCERT or CNCERT/CC) Beijing 100029China

Learning activities interactions between small groups is a key step in understanding team sports *** research focusing on team sports videos can be strictly regarded from the perspective of the audience rather than the *** team sports videos such as volleyball and basketball videos,there are plenty of intra-team and inter-team *** this paper,a new task named Group Scene Graph Generation is introduced to better understand intra-team relations and inter-team relations in sports *** tackle this problem,a novel Hierarchical Relation Network is *** all players in a video are finely divided into two teams,the feature of the two teams’activities and interactions will be enhanced by Graph Convolutional Networks,which are finally recognized to generate Group Scene *** evaluation,built on Volleyball dataset with additional 9660 team activity labels,a Volleyball+dataset is proposed.A baseline is set for better comparison and our experimental results demonstrate the effectiveness of our ***,the idea of our method can be directly utilized in another video-based task,Group Activity *** show the priority of our method and display the link between the two ***,from the athlete’s view,we elaborately present an interpretation that shows how to utilize Group Scene Graph to analyze teams’activities and provide professional gaming suggestions.

关键词： group scene graph group activity recognition scene graph generation graph convolutional network sports video understanding

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基于改进PBFT的在线旅游点评服务模型

电子设计工程 2024年第4期32卷 89-93页

作者：史文帜程永强刘晓峰陈泽华太原理工大学信息与计算机学院山西晋中030600 太原理工大学大数据学院山西晋中030600

基于传统旅游服务平台中存在的商家虚假评价、虚假宣传等问题,提出改进PBFT算法的在线旅游点评服务模型并采用超级账本(Hyperledger Fabric)开发模型。模型面向游客和商家两个用户角色,设计商家信息上链合约、用户点评合约和查询信息合... 详细信息

基于传统旅游服务平台中存在的商家虚假评价、虚假宣传等问题,提出改进PBFT算法的在线旅游点评服务模型并采用超级账本(Hyperledger Fabric)开发模型。模型面向游客和商家两个用户角色,设计商家信息上链合约、用户点评合约和查询信息合约,建立商家与游客两者间的直接联系,从而提升用户旅游体验感,消除商家与游客之间的信任裂缝。通过提出基于PBFT改进的共识机制F-PBFT,优化一致性协议减少节点间通信时间,提高共识效率。实验结果表明,文中所提出的F-PBFT算法的平均共识时延降低了6%,平均吞吐量提升了5%,具有较好表现。

关键词：区块链 Fabric 链码点评

Tournament screening cum EBIC for feature selection with high-dimensional feature spaces

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Science China Mathematics 2009年第6期52卷 1327-1341页

作者： chen zehua chen JiaHua Department of Statistics&Applied Probability National University of Singapore3 Science Drive 2117543Singapore Department of Statistics University of British ColumbiaVancouverBCV6T 1Z2Canada

The feature selection characterized by relatively small sample size and extremely high-dimensional feature space is common in many areas of contemporary *** high dimensionality of the feature space causes serious diffculties:(i) the sample correlations between features become high even if the features are stochastically independent;(ii) the computation becomes *** diffculties make conventional approaches either inapplicable or ine?*** reduction of dimensionality of the feature space followed by low dimensional approaches appears the only feasible way to tackle the *** this line,we develop in this article a tournament screening cum EBIC approach for feature selection with high dimensional feature *** procedure of tournament screening mimics that of a *** is shown theoretically that the tournament screening has the sure screening property,a necessary property which should be satisfied by any valid screening *** is demonstrated by numerical studies that the tournament screening cum EBIC approach enjoys desirable properties such as having higher positive selection rate and lower false discovery rate than other approaches.

关键词： extended Bayes information criterion feature selection penalized likelihood reduc-tion of dimensionality small-n-large-P sure screening

Coordination for a Closed-loop Supply Chain with Recycling Platform Considering Dynamic Setting

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Journal of Systems Science and Systems Engineering 2024年第4期33卷 425-451页

作者： zehua Xiang Ting Ji Lingfeng Dong School of Management Zhejiang UniversityHangzhou310058China School of Business Hangzhou City UniversityHangzhou310015China Alibaba Business College Hangzhou Normal UniversityHangzhou311121China

This paper presents a dynamic closed-loop supply chain(CLSC)model,incorporating a manufacturer,a retailer,and an internet recycling platform(IRP),utilizing differential game theory while considering the forgetting effect of *** model encompasses factors such as the quality level of used products and Big Data marketing(BDM),comparing optimal equilibriums under decentralized and cooperative decision *** effectively coordinate the dynamic CLSC at each time point,we propose a revenue-sharing and cost-sharing(RSCS)combined *** addition to ensuring reasonable sharing of revenues and costs,this contract allows the manufacturer to flexibly adjust wholesale prices for final products and transfer prices for used products in order to distribute profits appropriately and achieve Pareto optimality within the CLSC ***,our results indicate that there exists a threshold for Big Data marketing efficiency;high-efficiency BDM not only facilitates increased recycling on Internet platforms but also reduces unit recycling costs for ***,when implementing the combined contract,Big Data marketing efficiency does not impact the transfer price paid by manufacturers to Internet recycling platforms.

关键词： Big Data marketing differential game closed-loop supply chain coordination internet recycling platform

In honor of the 65th birthday of Professor Zhidong Bai

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Science China Mathematics 2009年第6期52卷 1233-1234页

作者： HU FeiFang & chen zehua Univ Virginia Charlottesville VA 22903 USA Natl Univ Singapore Singapore Singapore

We are thankful to Science in China Series A: Mathematics for the publication of this special issue in honor of Professor Zhidong Bai of his 65th birthday. Professor Bai is a leading statis-

关键词： Zhang

Numerical multi-physical optimization of operating condition and current collecting setup for large-area solid oxide fuel cells

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Frontiers in Energy 2024年第3期18卷 356-368页

作者： chengrong YU zehua PAN Hongying ZHANG Bin chen Wanbing GUAN Bin MIAO Siew Hwa CHAN Zheng ZHONG Yexin ZHOU School of Science Harbin Institute of TechnologyShenzhen 518055China Guangdong Provincial Key Laboratory of Deep Earth Sciences and Geothermal Energy Exploitation and Utilization Institute of Deep Earth Sciences and Green EnergyShenzhen UniversityShenzhen 518060China Key Laboratory of Advanced Fuel Cells and Electrolyzers Technology of Zhejiang Province Ningbo Institute of Materials Technology and Engineering of the Chinese Academy of SciencesNingbo 315201China Energy Research Institute at NTU(ERIAN) Nanyang Technological UniversitySingapore 639798Singapore

Due to the depletion of traditional fossil fuels and the aggravation of related environmental problems,hydrogen energy is gaining more attention all over the *** oxide fuel cell(SOFC)is a promising power generation technology operating on hydrogen with a high *** further boost the power output of a single cell and thus a single stack,increasing the cell area is an effective ***,it was recently found that further increasing the effective area of an SOFC single cell with a flat-tubular structure and symmetric double-sided cathodes would result in a lower areal *** this work,a multi-physical model is built to study the effect of the effective area on the cell *** distribution of different physical fields is systematically *** of the cell performance is also pursued by systematically tuning the cell operating condition and the current collection *** improvement of 42%is revealed by modifying the inlet gas flow rates and by enhancing the current *** the future,optimization of cell geometry will be performed to improve the homogeneity of different physical fields and thus to improve the stability of the cell.

关键词： solid oxide fuel cell(SOFC) large effective area flow rate discharge performance current collection