Results 31 to 40 of about 17,879 (217)
Applications of high-sensitivity flow cytometry for single mitochondria analysis [PDF]
, 2012 线粒体是细胞生命活动的控制中心，它不仅是细胞的能量中心，而且在多种诱因引发的细胞凋亡信号转导中起着重要的调节作用。以线粒体为切入点的信号转导研究，无论对于揭示细胞凋亡发生过程的分子机制，还是研究小分子化合物诱导肿瘤细胞凋亡的作用机理，均具有重要价值。与全细胞分析相比，单个线粒体水平上的分析能够排除其他细胞器的干扰，揭示线粒体功能之间的异质性，并有助于线粒体亚类的发现。然而，由于线粒体尺寸微小，与其功能相关的生化物质含量低以及缺乏灵敏的检测手段等原因，单个线粒体水平上的检测一直以来都是一个富有挑战性的课题。
张舒越
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Jianzhu Gangjiegou Jinzhan, 2013 研究分析了欧洲第三代核电站（EPR,European Pressurized-water Reactor）核岛安全壳钢衬里的模块化吊装。首先研究了环形桁架在进行钢衬里吊装时最不利竖向荷载下的受力性能;其次对钢衬里吊装环形桁架进行了参数优化分析,研究环形桁架的不同参数变化对桁架性能的影响,确定出环形桁架的优化参数取值;最后对某核岛安全壳钢衬里穹顶吊装时的各项受力性能进行了研究,包括吊装受力分析、风荷载作用分析及吊耳节点有限元分析,并提出了一些参数的取值及吊装方案的合理建议,为工程施工设计提供了参考。
叶垚 +4 more
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Structuring wicked problems in science communication
Review of Policy Research, EarlyView.Abstract Public policy scholars increasingly deal with wicked problems and how diverse actors structure these problems in policy processes. However, the role of actors at the interface of science and society such as science communicators in structuring wicked problems remains widely unclear.
Sabrina Kirschke, Hannah Kosow
wiley +1 more source
Review of Policy Research, EarlyView.Abstract Short‐term policy (STP) has attracted considerable attention as a form of time‐related public policy and is typically used to solve urgent problems. The objective of this study, which considers STP as policy myopia from an information science perspective, is to discuss the challenges encountered during the STP policymaking process and their ...
Prasongchai Setthasuravich +1 more
wiley +1 more source
Innovating Public Food Procurement: A Case Study of Dordogne's Path to Sustainability
Review of Policy Research, EarlyView.ABSTRACT This study examines how an innovative mix of policy instruments can drive sustainable public food procurement (SPFP) in public institutions. Using the Dordogne Department in France as a case study, it explores the role of governance, capacity‐building, stakeholder collaboration, digitalization, and cost management in transforming school food ...
Paola Vola +5 more
wiley +1 more source
Rapid variant design of machine tool based on parametric techniques [PDF]
, 2007 在产品的概念设计过程中,融入参数化技术,实现大规模定制化产品的快速设计。针对机床产品,以UG为软件平台,结合VC++和SQLServer数据库开发机床产品参数化变型系统,并讨论从功能需求到结构参数模型的映射过程、主要结构特征尺寸参数化等关键技术,通过参数化实现产品级的机床快速变型设计。The rapid design base on mass customization was realized by the parametric techniques in the conceptual design ...
侯亮, 郑添杰, 颜华生
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Guangtongxin yanjiu, 1996 光频分复用（ＯＦＤＭ）充分地利用了光纤传输带宽，扩大了通信系统容量，近年来取得了很大发展。文中根据ＦＳＫ－ＦＤＭ系统特性，介绍了一种时域分析方法，进行计算机数值解，给出了接收信号的眼图。通过眼图可以直观地分析系统参数对系统的影响，得到了系统参数优化设计值。
张权, 郭建恩, 李玲
doaj
Variations in skin biophysical parameters with age, sex and breed in dogs
Veterinary Dermatology, EarlyView.Background – Understanding the physiological and biophysical characteristics of skin provides information for developing appropriate management strategies for skin diseases. However, in dogs, variations in skin biophysical parameters, such as age, sex and breed, remain poorly understood.
Je‐Seong Kwon +8 more
wiley +1 more source
Research on Off-line Truing and Measuring Technology of Bonnet Polishing Tool [PDF]
, 2014 非球面光学元件以其优异的性能被广泛应用于军用和民用产品中，其性能和精度要求也日渐提高。抛光是非球面元件精密加工的最重要和最终的工序，对非球面的加工质量具有重要的影响，但传统的抛光技术存在明显的缺点。气囊抛光技术是一种新兴的、具有发展潜力的抛光技术，其具有吻合性好、精确可控等优点。气囊抛光工具作为与工件直接接触的部件，其尺寸精度和形状精度影响抛光加工的精度。为保证抛光加工过程的稳定性和精确可控性，在抛光加工中需要对气囊抛光工具进行精密修整。 根据气囊抛光机床及气囊抛光工具的组成和结构特点 ...
白志扬
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Guangtongxin yanjiu, 2012 由于调制光信号质量的好坏影响到传输和接收信号质量的好坏,因此对100Gbit/s系统中的数字光信号的测量与分析十分重要。文章对100Gbit/s transponder中调制光信号的生成原理进行了分析,对数字光信号测试中的OSNR（光信噪比）、EVM（误差矢量幅值）和星座图等几个参数进行了必要的理论探讨。同时也分析了各种QPSK（四相相移键控）信号星座图的图形,为使用调制器分析问题提供了有效参考。
黄莹, 胡毅, 余少华, 邹晖
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