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本文根据背阴山水库的地形地质条件,按中小型水利水电工程地质勘察规范要求,探讨了水库位置的工程地质条件,为立项、设计提供依据。 相似文献
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本文根据背阴山水库的地形地质条件,按中小型水利水电工程地质勘察规范要求,探讨了水库位置的工程地质条件,为立项、设计提供依据。 相似文献
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工程地质勘察信息是工程建筑设计和城市规划的基础。工程地质勘察信息种类繁多，数量庞大，加工、处理、管理工作十分复杂，因此，研究工程地质勘察信息的获取以及高效管理应用具有十分重要的意义。本文首先对工程地质勘察信息资源的获取做了简要的介绍，而后对工程地质勘察信息资源的规范化，信息化管理进行了系统地分析。 相似文献
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指标分析在现代情报研究中具有重要作用,情报研究中所涉及的指标分为评价指标和分析指标两大类型,在情报研究中要注意从内涵、外延、时效性以及指标发布的主体来把握对有关指标的分析使用. 相似文献
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水电工程地质勘察是水电建设的基础。工程地质勘察质量的好坏直接关系到电站工程设计依据的可靠性。因此，总结水电建设中工程地质勘察的实践与经验，探索提高工程地质勘察水平，缩短勘察周期，少走弯路，对于水电建设是十分重要的。 相似文献
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通过对我国现行沥青路面设计指标的分析,指出我国弯沉指标和设计规范在运用中存在的问题,同时提出在我国路面结构设计中采用多指标设计体系的思路,对于提高沥青路面结构设计的合理性具有重要意义。 相似文献
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路面弯沉是反映路面各结构层整体强度和刚度的重要指标，同时也与路面的使用状态存在着一定的内在联系。在施工过程中，取得路基路面的弯沉数据，有助于及早发现施工质量隐患，避免路面的早期破坏。对此进行了分析和探讨，并建议建立一套专用于计算施工检验弯沉的数学公式来进一步完善道路工程的质量验收。 相似文献
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专利价值评价指标概述及层次分析 总被引：1，自引：0，他引：1
与成本法、收益法和市场价值法相比，专利价值指标评价方法由于其可以对专利本身进行深入的定量研究，客观且具有国际可比性，因此获得了广泛的重视和应用，但存在的不足是对这些指标的整体性和相互联系研究不够。本文在分析不区分专利指标层次性所带来问题的基础上，提出了专利指标的层次结构。这一层次划分使我们更准确地了解评价指标之间的因果和相关关系，使专利评价更准确、更切合实际。最后，本文分析了专利价值指标评价方法在我国的发展和应用前景。 相似文献
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《中国科学院院刊(英文版)》2007,21(4):211
As the first US FDA-approved monclonal antibody drug for the treatment of B-cell lymphomas and later on for the treatment of autoimmune diseases, Rituximab has been widely sold under the trade name of Rituxan ever since 1997 with an average sales volume over US＄ 2 billion each year in the US.However, the recognition mechanism between Rituximab and its target CD20, an antigen expressed on the surface of mature B-cells, remained unclear. Now, an important step toward decoding the longstanding problem is achieved by scientists at the CAS Shanghai Institutes for Biological Sciences(SIBS) and their collaborators from the Second Military Medical University. 相似文献
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理财目标有几种不同的观点，在知识经济时代，由于这些目标不能正确反映企业各产权主体及其利益相关者各自权益和他们之间的最新均衡结构，已不可取，取而代之的应该是“利益相关者财富最大化“这一新的理财目标。围绕该目标，制订并落实其评价指标，并使其具体化和量化。 相似文献
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Data exchange is the problem of taking data structured under a source schema and creating an instance of a target schema, by following a mapping between the two schemas. There is a rich literature on problems related to data exchange, e.g., the design of a schema mapping language, the consistency of schema mappings, operations on mappings, and query answering over mappings. Data exchange is extensively studied on relational model, and is also recently discussed for XML data. This article investigates the construction of target instance for XML data exchange, which has received far less attention. We first present a rich language for the definition of schema mappings, which allow one to use various forms of document navigation and specify conditions on data values. Given a schema mapping, we then provide an algorithm to construct a canonical target instance. The schema mapping alone is not adequate for expressing target semantics, and hence, the canonical instance is in general not optimal. We recognize that target constraints play a crucial role in the generation of good solutions. In light of this, we employ a general XML constraint model to define target constraints. Structural constraints and keys are used to identify a certain entity, as rules for data merging. Moreover, we develop techniques to enforce non-key constraints on the canonical target instance, by providing a chase method to reason about data. Experimental results show that our algorithms scale well, and are effective in producing target instances of good quality. 相似文献
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本文从R＆D绩效管理的战略定位，阐明了R＆D绩效管理体系，提出了全面测量研发绩效的定量和定性指标，确定指标权重的方法，以提高企业的核心竞争力。 相似文献
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《Journal of The Franklin Institute》2022,359(5):2377-2402
Distributed target tracking is an important problem in sensor networks (SNs). In this paper, the problem of distributed target tracking is addressed under cyber-attacks for targets with discrete-time and continuous-time nonlinear dynamics. Two distributed filters are obtained for every node of the SN to estimate the states of a general class of nonlinear targets which can be seen in many practical applications. Compared with the existing results in the literature, the network topology of the SN is assumed to be subjected to the denial-of-service attack such that the communication links among sensor nodes are paralyzed or destroyed by this kind of attack. Moreover, the proposed algorithms are designed based on an event-triggered communication strategy that means the frequency of information transmission and unnecessary resource consumption are significantly reduced. The presented algorithms’ stability is also analyzed in the presence of noise to achieve secure event-triggered target tracking in mean-square. Two simulation examples are utilized to demonstrate the efficiency of the proposed event-triggered algorithms. 相似文献
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目前外资R＆D机构已成为我国一支重要的科技创新力量,正对我国经济、科技和社会产生广泛而深远的影响.外资R＆D机构的本地绩效,是指外资R＆D机构对东道国经济、社会、科技等各方面所产生的影响.这种影响具有广泛性、动态性、差异性和双重性,既有正面的、也有负面的,并且受到多方面因素的影响和制约.根据外资R＆D机构本地绩效的内涵及其影响因素构建指标体系,对其本地绩效进行测评,既可为政府管理部门制定外商R＆D投资政策提供决策依据,也是对科研机构绩效评估和外商投资理论的补充和完善,具有较高的理论和实践价值. 相似文献
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详细地分析了Huynen目标分解方法的基本理论.简要介绍Barnes-Holm目标分解与Yang目标分解的基本原理,强调这2种方法对Huynen目标分解的补充与改进.最后将3种目标分解方法应用于实际数据,分析其应用效果,提出方法的优点与不足. 相似文献
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基于绿色设计能力评价指标体系,运用熵权TOPSIS方法对于区域绿色设计能力做出评价.结果表明,各省市与地区间不均衡发展问题突出,显示出明显的地区性差异;中部地区和西部地区各省绿色设计能力综合排名靠后,面临着严峻挑战.为提升绿色设计能力,提出推进绿色设计区域协调发展、优化绿色发展政策,建设绿色供应链体系、推行可持续发展乡村振兴战略、引导绿色产品的消费,加大绿色设计研发和投入等建议. 相似文献
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Leitao Gao Guangshe Zhao Guoqi Li Lei Deng Fei Zeng 《Journal of The Franklin Institute》2018,355(16):8141-8157
Determining an input matrix, i.e., locating predefined number of nodes (named “key nodes”) connected to external control sources that provide control signals, so as to minimize the cost of controlling a preselected subset of nodes (named “target nodes”) in directed networks is an outstanding issue. This problem arises especially in large natural and technological networks. To address this issue, we focus on directed networks with linear dynamics and propose an iterative method, termed as “L0-norm constraint based projected gradient method” (LPGM) in which the input matrix B is involved as a matrix variable. By introducing a chain rule for matrix differentiation, the gradient of the cost function with respect to B can be derived. This allows us to search B by applying probabilistic projection operator between two spaces, i.e., a real valued matrix space RN?×?M and a L0 norm matrix space by restricting the L0 norm of B as a fixed value of M. Then, the nodes that correspond to the M nonzero elements of the obtained input matrix (denoted as ) are selected as M key nodes, and each external control source is connected to a single key node. Simulation examples in real-life networks are presented to verify the potential of the proposed method. An interesting phenomenon we uncovered is that generally the control cost of scale free (SF) networks is higher than Erdos-Renyi (ER) networks using the same number of external control sources to control the same size of target nodes of networks with the same network size and mean degree. This work will deepen the understanding of optimal target control problems and provide new insights to locate key nodes for achieving minimum-cost control of target nodes in directed networks. 相似文献