检索结果-南通市图书馆

物流科技 2016年第11期39卷 121-124页

作者：张辉魏金石姜楠中国航天科工飞航技术研究院物资供应站北京100074

研究了美国、欧洲、日本等发达国家大型航空航天企业集团供应链管理情况,提出了对我国航空航天物流与供应链在理论研究、顶层设计、流程再造、管理方法、先进技术、标准体系和人才队伍等方面进行管理提升的启示。

关键词：航空航天物流供应链

在线全文

学校读者我要写书评

暂无评论

姜OSCA基因家族的鉴定及表达分析

农业生物技术学报 2024年第7期32卷 1518-1532页

作者：龙茶汪淘花河兰吴媛苏世贤韦金江江苏燕牟海林祝洪江吕金丽夏应书李伟贵州大学农学院贵州大学蔬菜研究院贵州省高等学校设施蔬菜工程研究中心花溪区植保站六盘水市农业科学研究院贵州黔棠姜生物科技有限公司

钙通透性阳离子通道蛋白(hyperosmolarity-gate calcium-permeable channels, OSCA)是一种机械敏感性成孔离子通道，能调节渗透胁迫下植物细胞内的Ca2+浓度以及水分运输速率，在植物的高渗应激中起着重要作用。为了解OSCA基因家族在姜(Z... 详细信息

钙通透性阳离子通道蛋白(hyperosmolarity-gate calcium-permeable channels, OSCA)是一种机械敏感性成孔离子通道，能调节渗透胁迫下植物细胞内的Ca2+浓度以及水分运输速率，在植物的高渗应激中起着重要作用。为了解OSCA基因家族在姜(Zingiber officinale)中的结构特征和表达特点，本研究对姜OSCA基因家族进行鉴定与表达分析。结果表明，从姜基因组中鉴定到了38个OSCA基因家族成员，分别定位于14条染色体上。亚细胞定位预测表明，姜OSCA家族成员主要定位于质膜上。启动子顺式作用元件分析显示，38个ZoOSCAs含有茉莉酸甲酯、脱落酸以及干旱等多种于逆境和激素应答响应元件。盐胁迫转录组及干旱处理的荧光定量结果显示，盐胁迫下叶和根茎中分别有18和23个家族成员表达量上调；干旱处理下14个成员中有11个表达量上调，且ZoOSCAs在不同组织中的表达水平不同。本研究可为深入揭示ZoOSCAs的功能和作用机制提供基础资料。

关键词：姜钙通透性阳离子通道蛋白(OSCA) 基因家族鉴定表达分析

广东省各市旅游业发展水平研究——基于主成分分析和聚类分析方法

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

财经理论研究 2017年第1期 40-49页

作者：宋时蒙蒋盛益广东外语外贸大学经济贸易学院广东广州510006 广东外语外贸大学思科信息学院广东广州510006

旅游业作为拉动区域经济发展的重要产业,在广东省经济中的地位日益重要。然而由于经济基础不一,资源分布不均,导致广东省各地级市旅游业发展水平严重失衡。本文以2015年《广东统计年鉴》数据为基础,建立科学合理的指标体系,利用主成分... 详细信息

旅游业作为拉动区域经济发展的重要产业,在广东省经济中的地位日益重要。然而由于经济基础不一,资源分布不均,导致广东省各地级市旅游业发展水平严重失衡。本文以2015年《广东统计年鉴》数据为基础,建立科学合理的指标体系,利用主成分分析和聚类分析方法对广东省21个地级市的旅游业发展水平进行综合评价,力图找出各市在发展旅游业方面的优势和劣势,并根据实证分析结果对如何提高旅游业发展水平提出合理性建议。

关键词：主成分分析聚类分析旅游业发展水平

Synthesis of chiral phosphine derivatives through a copper（I）-catalyzed desymmetric SNAr reaction

在线全文

学校读者我要写书评

暂无评论

Science China Chemistry 2025年

作者： Shuai Zhang Pei-Zhi Liu Yan-Bo Li Qi Zhang Jun-Zhao Xiao Yi-Fan Wang Tian-Yu wei Jia-wei jiang Ye Wang Qian Peng Liang Yin Key Laboratory of Fluorine and Nitrogen Chemistry and Advanced Materials Shanghai Institute of Organic Chemistry University of Chinese Academy of Sciences Chinese Academy of Sciences State Key Laboratory of Elemento-Organic Chemistry and Tianjin Key Laboratory of Biosensing and Molecular Recognition College of Chemistry Frontiers Science Center for New Organic Matter Nankai University Haihe Laboratory of Sustainable Chemical Transformations

Axially chiral phosphines are a class of extremely important ligands in asymmetric catalysis. Herein, an unprecedented copper（I）-catalyzed asymmetric SNAr reaction with HP（S）R2is uncovered, which delivers a series of axially chiral phosphine derivatives in high yields with excellent enantioselectivity. Furthermore, the diastereoselective reaction with the kinetic resolution of racemic HP（S）ArR proceeds smoothly, providing the products with moderate diastereoselectivity and excellent enantioselectivity. Control experiments indicate that HP（S）Ph2is much more active than HPPh2and HP（O）Ph2as the pronucleophile in the present reaction. It is found that the SNAr reaction （the first SNAr） proceeds in a desymmetric manner, providing the desired chiral products while a continued SNAr reaction （the second SNAr） slightly occurs in a kinetic resolution manner in the present catalytic system, which enhances the ee of the desired chiral products. DFTcalculations support a concerted reaction pathway rather than a step-wise mechanism. Finally, axially chiral olefin-phosphines produced by the present method work as suitable ligands in Pdcatalyzed asymmetric allylic substitution with C-, N-, and O-nucleophiles and Rh-catalyzed asymmetric addition of arylboronic acid to benzil.

关键词：

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

锚杆静压桩挤土效应的计算

西部探矿工程 2007年第2期19卷 6-8页

作者：张友权金伟江中冶集团建筑研究总院华东分院上海200940

分别用柱形孔扩张法和有限元方法对锚杆静压桩沉桩过程中的挤土效应进行了分析,并结合工程实例对两种方法计算的结果进行了比较,很好地探讨了沉桩挤土规律,具有一定的工程实用价值。

关键词：锚杆静压桩挤土柱形孔扩张法有限元

Involvement of spinal neurotrophin-3 in the electroacupuncture analgesia in rat model of monoarthritis

在线全文

学校读者我要写书评

暂无评论

Involvement of spinal neurotrophin-3 in the electroacupunctu...

Metastable seed-crystals: epitaxial growth of branched-array organic heterostructure nanowires

中国生理学会第23届全国会员代表大会暨生理学学术大会

作者： Wen-Li MI,Xiu LI,Qi-Liang MAO-YING,Xiao-wei WANG,Chang-jiang YANG,Jian-wei jiang,jin YU,Jun WANG,Qiong LIU,Yan-Qing WANG~*,Gen-Cheng WU~* Department of Integrative Medicine and Neurobiology,State Key Laboratory of Medical Neurobiology,Institutes of Brain Science, Shanghai Medical College,Fudan University,Shanghai 200032,China

＜正＞Although electroacupuncture（EA） is proved to be effective at pain relief in arthritis,the underlying mechanism of EA analgesia remains to be further *** analgesic effects of EA had been reported to be associated with its counter-regulation to spinal glial ***-3（NT-3） is demonstrated to be involved in pain regulation,and could be up-regulated by EA treatment after spinal cord *** an complete Freund’s adjuvant（CFA） induced inflammatory pain model in rats,the present study demonstrated that（1） Repeated EA stimulation of ipsilateral‘Huan-Tiao’（GB30） and‘Yang-Ling-Quan’（GB34） acupoints remarkably suppressed CFA-induced hyperalgesia;（2） EA treatment markedly enhanced the up-regulation of spinal NT-3 mRNA and protein level following CFA injection;（3） Antisense oligodeoxynucleotide（ODN） specifically against NT-3 intrathecally administered during EA treatment for 7 days significantly attenuated the EA analgesia;（4） The suppression of the expression of glia fibrillary acidic protein（GFAP,astrocytic marker）,OX-42（microglial marker）,as well as proinflammatory cytokines,interleukin（IL）-1β,IL-6 and tumor necrosis factor（TNF）-αin spinal dorsal horn by EA treatment was significantly attenuated following NT-3 antisense ODN *** data indicated that endogenous NT-3 might be involved in EA analgesia on inflammatory pain of rats and this effect is possibly through the inhibition of spinal glia activation as well as the proinflammatory cytokines ***,the present study may initiate the discussion on the possible roles of NT-3/glia/cytokines in the therapeutic effects of acupuncture and shed light on the deeper understanding of mechanism underlying acupuncture analgesia in arthritis.

关键词： monoarthritis electroacupuncture neurotrophin-3 glia proinflammatory cytokines.

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

Science China Chemistry 2025年

作者： jin Feng Zhen-Yu Geng Ting-Yao Song Ying-Xin Ma Chuan-Zeng Wang wei Zhang Hong-Tao Lin jin Zhou Shu-Ping Zhuo Shu-Hai Chen Xue-Dong Wang School of Chemistry and Chemical Engineering Shandong University of Technology Institute of Functional Nano & Soft Materials (FUNSOM) Jiangsu Key Laboratory for Carbon-Based Functional Materials & DevicesSoochow University College of Chemistry and Chemical Engineering Hunan Normal University

Tunable light–matter interactions are exhibited by organic low-dimensional crystals, making these crystals a promising platform for organic photonics. However, the precise synthesis of organic low-dimensional crystals remains challenging due to the stochastic nature of molecular nucleation processes. Herein, the directed nucleation process is driven by the introduction of metastable seed-crystals as the trunk, which ultimately leads to branched-array organic heterostructures. The successful formation of organic heterostructures with high-density branched arrays is attributed to the highest attachment energy (Eatt（023）=-104.25 kcal mol-1) of the exposed （023） crystal plane during the seed-crystal growth route. Significantly, these as-prepared heterostructures inherently have an ultralow lattice mismatch ratio η of 0.7%between trunk and branch, which contributes to the multi-channel photon transportation. Therefore, this work provides valuable insights into a versatile synthetic strategy for accessing low-dimensional heterostructures for integrated optoelectronics.

关键词：

基于CodeBERT和Stacking集成学习的补丁正确性验证方法

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

计算机科学 2025年第1期52卷 250-258页

作者：韩威姜淑娟周伟中国矿业大学计算机科学与技术学院江苏徐州221116 中国矿业大学矿山数字化教育部工程研究中心江苏徐州221116

近年来,自动程序修复已成为软件工程领域的重要研究课题。然而,现有的自动修复技术大多是基于补丁生成和测试的,在补丁验证环节时间成本很高。此外,由于测试套件的不完备,许多候选补丁虽然能通过测试,但实际上并不正确,从而导致补丁过... 详细信息

近年来,自动程序修复已成为软件工程领域的重要研究课题。然而,现有的自动修复技术大多是基于补丁生成和测试的,在补丁验证环节时间成本很高。此外,由于测试套件的不完备,许多候选补丁虽然能通过测试,但实际上并不正确,从而导致补丁过拟合。为提高补丁验证的效率并缓解补丁过拟合的问题,提出了一种静态的补丁验证方法。该方法首先使用大型预训练模型CodeBERT自动提取缺陷代码片段和补丁代码片段的语义特征,然后使用历史缺陷修复补丁数据训练Stacking集成学习模型,训练之后的模型可以对新的缺陷修复补丁进行有效验证。在Defects4J缺陷数据集相关的1 000个补丁数据上对所提方法的验证能力进行评估。实验结果表明,该方法可以有效地验证补丁的正确性,从而提高补丁验证的效率。

关键词：自动程序修复补丁验证预训练模型集成学习 Defects4J缺陷数据集

斜拉索黏性剪切型阻尼器在永川长江大桥的应用

在线全文

学校读者我要写书评

暂无评论

工程建设与设计 2017年第3期 120-122页

作者：杨天伟姜金星中交一公局厦门工程有限公司福建厦门361000

黏性剪切型阻尼器(VSD)的原理是利用高黏度流体的黏滞力来耗散斜拉索振动的能量,降低斜拉索的振动幅度,从而抑制斜拉索的振动。阻尼器固定在斜拉索与桥面之间,可以很大程度地提高斜拉索的附加阻尼,从而达到阻尼减振的目的。

关键词：斜拉索黏性剪切型阻尼器

Homologous CoS2 interface with directed electron transfer and strong chloridion repulsion for efficient seawater oxidation

在线全文

学校读者我要写书评

暂无评论

Science China Chemistry 2025年

作者： Yuan Tian jiang-Bo Chen Jie Ying Ge Tian Yu-Xuan Xiao Yi Lu Si-Ming Wu wei Geng Ling Shen Xiao-Yu Yang State Key Laboratory of Advanced Technology for Materials Synthesis and Processing and School of Materials Science and Engineering and Shenzhen Research Institute & Laoshan Laboratory Wuhan University of Technology School of Chemical Engineering and Technology Sun Yat-Sen University National Energy Key Laboratory for New Hydrogen-Ammonia Energy Technologies Foshan Xianhu Laboratory

Seawater electrolysis is a highly promising method to produce high energy density hydrogen,especially in dry areas that have scarce freshwater ***,application of seawater electrolysis is confronted by two major problems associated with catalysts employed for the anodic oxygen evolution reaction （OER） including the competitive hypochlorite evolution reaction（HCER） and strong chloridion （Cl–） triggered *** studies aimed at overcoming these problems,a facile method has been developed to synthesize a homologous CoS2heterojunction as an OER *** to a difference in work functions at the interface and increased electron density,this material has directed electron transfer and strong chloridion repulsion properties,*** have shown that CoS2achieves low overpotentials of 289 and 322 mV at 10 mA cm-2current density in respective alkaline （1 M KOH） and alkaline simulated seawater ***,the outstanding stability of CoS2is reflected in a negligible decline in activity during promotion of the OER for 100 *** of density functional theory calculations reveal that the homologous CoS2heterojunction promotes directed electron transport for optimizing adsorption/desorption of reactive species and heightens the Cl-adsorption energy for strongly repulsing Cl-,phenomena that enhance OER performance in alkaline simulated seawater.

关键词：