基于定关断面积的分层接入UHVDC系统换流器协调控制策略

基于分层接入特高压直流输电（UHVDC）系统逆变侧高低端的耦合特性,分析叠弧面积增加引发换流器换相失败的机理,提出一种抑制分层接入UHVDC系统非故障层换流器换相失败的协调控制策略。该策略通过补偿交流故障后非故障层换流器所需的叠弧面积,使晶闸管具有足够的关断面积完成去游离过程,从而防止换相失败的发生。最后基于PSCAD/EMTDC搭建实际系统模型并进行了仿真验证,结果表明所提协调控制策略能有效抑制不同故障程度下受端电网对称和不对称故障下非故障层换流器的换相失败,可提升系统的稳定性。     

Hydrogen safety engineering framework and elementary design safety tools

The viability and public acceptance of Hydrogen and Fuel Cell (H2FC) systems and infrastructure depends on their robust safety engineering design and on education and training of the workforce, regulators and other stakeholders in the state-of-the-art in the field. This can be provided only through building up and maturity of the Hydrogen Safety Engineering (H2SE) profession. H2SE is defined as an application of scientific and engineering principles to the protection of life, property and environment from adverse effects of incidents/accidents involving hydrogen. This paper describes a design framework and overviews a structure and contents of elementary design safety tool for carrying out H2SE. The approach is similar to British Standard BS7974 for application of fire safety engineering to the design of buildings and has been expanded to reflect on specific hydrogen safety related phenomena, including but not limited to high pressure under-expanded leaks and dispersion, spontaneous ignition of sudden hydrogen releases to air, deflagrations and detonations, etc. The H2SE process includes three main steps. Firstly, a qualitative design review is undertaken by a team that can include owner, hydrogen safety engineer, architect, representatives of authorities having jurisdiction, e.g. fire services, and other stakeholders. The team defines accident scenarios, suggests trial safety designs, and formulates acceptance criteria. Secondly, a quantitative safety analysis of selected scenarios and trial designs is carried out by qualified hydrogen safety engineer(s) using the state-of-the-art knowledge in hydrogen safety science and engineering, and validated models and tools. Finally, the performance of trial safety designs of H2FC system and/or infrastructure is assessed against acceptance criteria predefined by the team. This performance-based methodology offers the flexibility to assess trial safety designs using separately or simultaneously three approaches: deterministic, comparative or probabilistic.     

An assessment view to evaluate whether Spatial Data Infrastructures meet their goals

The motives for constructing Spatial Data Infrastructures (SDIs) are often based on their anticipated benefits for society, economy, and environment. According to those widely articulated but rarely proven benefits, SDI coordinators have been defining more specific objectives to be achieved by their SDIs. However, there is a limited number of assessment approaches that are able to demonstrate whether SDIs indeed realize the intended goals. In this article we develop, apply and evaluate an assessment view for evaluating the extent to which SDIs realize their goals. The assessment view has been developed stepwise using the Multi-view SDI assessment framework as a guideline. The application of the proposed view in the Dutch SDI demonstrates its potential. In addition, the evaluation of the proposed view by the potential users confirms to a certain extent its usability. The results also show that the ease of determining assessment indicators depends on the precision with which the SDI goals are formulated.     

制造柔性的概念框架及其度量

研究了制造柔性的概念，讨论了制造柔性的特点及其对制造系统综合运行性能的影响，提出了一个用于对制造柔性进行分类的概念框架，探讨了制造柔性的度量方法。     

理想读者视角下的批评话语分析

长期以来,批评话语分析疏于对读者认知的系统研究,只注重文本分析和社会文化解释,而对解读阶段的研究只"提"不"问"。O’Halloran(2003)的"理想读者框架"为研究读者认知提供了参照点,但该框架只强调读者的个体认知和阅读目的,限制了读者的类型,割裂了读者的个体认知与社会认知,忽视了对阅读前读者知识结构的研究,简单地将认知付出等同于话语理解的深度。将个体认知与社会认知结合起来,区分不同类型的读者,研究具有意识形态性质的知识结构,有助于更好地把握意识形态如何通过文本在大众中传播和变化。     

框架锚杆在山区边坡加固中的应用

持续的强降雨使得架空线路的基础边坡发生大规模边坡溜坡事故,给线路运行带来安全隐患。采用框架锚杆加固、框架内挂网喷浆或植被防护、三维网植草、加强截排水等一系列综合措施对边坡进行加固处理,取得良好的加固效果。主要通过现场岩土锚杆的拉拔试验以验证框架锚杆设计参数的合理性,结果表明框架锚杆对山区架空线路的边坡加固具有良好的经济...     

A guiding framework and approach for implementation research in substance use disorders treatment.

This paper introduces readers to the concepts of implementation science, implementation theory, and implementation frameworks and models. A wide range of models has been published in the literature related to implementation. The paper will present an overview of the Consolidated Framework for Implementation Research (CFIR), which is a comprehensive typology that unifies and consolidates the array of constructs that influence implementation from the perspective of these models. The CFIR is then used to evaluate implementation models used in studies of substance use disorder (SUD) treatments. Implementation research is scarce, with few prospective studies of theory-driven implementation. We assert that future research in SUD needs to meet three overarching objectives to promote wider implementation of evidence-based practices: (a) differentiation of core versus adaptable components of evidence-based interventions need; (b) development of methods to design implementation strategies, effectively adapted to the broad context; and (c) design and testing of predictive models to assess likelihood of effective implementation and prospects for sustainability while taking into account salient contextual factors. A recommended strategy for accomplishing these objectives is described. (PsycINFO Database Record (c) 2011 APA, all rights reserved)     

无损压缩编码的关联性框架模型

通过信源符号之间的时序关系、并行关系、或因果关系的分析方法，为信源符号之间的相关性结构构建了基于关联性框架的统一模型。在该模型框架下分析得出游程编码属于信源并行关系结构、词典编码属于信源因果关系结构、自适应Huffman编码属于信源时序关系结构的结论。不仅为这些无损压缩编码编码方法提供了一个统一描述途径。也为进一步改进关联性编码提出了新的思路。     

Changes in the chemical composition of traditional Chinese‐type soy sauce at different stages of manufacture and its relation to taste

Chemical composition of traditional Chinese‐type soy sauce (TCSS) at different stages of manufacture (moromi fermentation and pasteurisation) were analysed. Results showed that total nitrogen, formaldehyde nitrogen, total titratable acid, reducing sugar, NaCl, water soluble peptides, free amino acids (FAAs) and Maillard reaction products in TCSS changed significantly during manufacture. Most of FAAs were released during initial stage (0–15 days) of moromi fermentation, peptides (1–5 kDa) kept dominant (69.34–80.88%) among all peptides during manufacture and Maillard reaction products increased progressively during moromi fermentation and increased sharply during pasteurisation. According to hierarchical cluster analysis and sensory evaluation, there were obvious correlation between FAAs and sensory score of over‐all in TCSS during manufacture, which indicated that balanced FAAs composition might be mainly responsible for the taste formation of TCSS. Besides, pasteurisation can further improve the over‐all taste of TCSS.     

辊压磨行星齿轮减速器漏油分析

对辊压磨行星齿轮减速器漏油的原因进行了系统地分析。对预防漏油而采取的技术措施进行了全面地阐述,经生产实践证明预防漏油的技术措施效果良好。