Scattering problems of the SH Wave by Using the Null-Field Boundary Integral Equation Method

The scattering problem of seismic waves is an important issue for studying earthquake engineering. In this paper, the null-field boundary integral equation approach was used in conjunction with degenerate kernels and eigenfunction expansion to solve the SH-wave scattering problem of a circular or an elliptical-arc hill. The original problem is divided into subdomains by taking a free-body diagram. One region is an interior boundary value problem. The other is a canyon scattering problem. For the boundary value problem, not only a simply connected domain (elliptical-arc hill problem) but also a doubly connected domain (a circular-arc hill problem containing a circular tunnel or a circular inclusion) is considered. The canyon scattering problem may be addressed in an infinite domain with an artificial boundary of a full plane such that the degenerate kernel can be fully utilized. The null-field integral equation method is used to match boundary conditions. Numerical results are compared favorably with the available data.     

中国国民政府与琉球问题

20世纪40年代,中国国民政府曾一度面临解决中、日之间悬而未决的琉球问题的有利时机。但是,由于国民政府内部分歧重重,以及二战后最高当局忙于内战,没有能够在该问题上达成任何政府共识,最终丧失了解决琉球问题的法理权。而且,伴随着东、西方冷战的加剧以及国民政府在国共内战后败退台湾,琉球问题被美国所操纵而成为美、日冲绳问题,从而给海峡两岸的中国人民留下深深的历史遗憾。     

Threats to Common‐Pool Resources and the Importance of Forums: On the Emergence of Cooperation in CPR Problem Settings

This paper focuses on cooperation among organizations in a common‐pool resource (CPR) problem situation. Cooperation is particularly challenging in settings where resource degradation is produced by a variety of different sectors and parts of the population; and where the problem, as well as public responsibilities, transcend borders and jurisdictions. Focusing on transboundary water quality management in the Rhine catchment area, we ask: What drives two actors in a CPR problem situation to cooperate with each other? We argue that the degree of threat to a CPR is an important driver for collective action, and focus on actors’ exposure to and perception of a threat to a CPR. Furthermore, we rely on applications of the ecology of games framework (EGF), taking into account the larger institutional context of CPR management. This allows us to test whether actors’ participation in forums, such as regional and international water body associations, helps to overcome the CPR problem by further enhancing interactions among actors. Based on survey data and applying advanced network statistics (exponential random graph models [ERGM]), we conclude that although problem exposure is one factor that enhances joint cooperation, participation in forums plays an even bigger role for cooperation in a CPR problem setting. Our study contributes to research on cooperation in CPR problem settings, highlights the need to more systematically include the effects that CPR problems have on actors when analyzing CPR problem settings, and stresses the function of forums as triggers for cooperation in CPR problem situations.     

试论《临时约法》对庙产问题的影响

庙产问题是清末民初时期一个重大的社会问题,它是由庙产兴学政策引起的。《临时约法》的颁布对庙产问题产生了广泛而又深远的影响：一是激发了普通民众的国民意识和平等意识;二是改变了清末以来征用庙产的标准;三是使清末以来征用庙产的行为失去了合法依据;四是赋予普通民众聚集力量的手段。这就使庙产问题迅速复杂化、表面化,促使政府制定相关政策,进而使庙产问题向法制化的方向迈出了重要的一步。     

关于人物入志的探讨

人物是地方志书要认真记述的重要内容。人物入志是发挥地方志书资治、教化、存史功能的需要,是社会各界人士了解人的作用的需要。人物入志的基本做法有：为去世的重要人物立传入志,为在世的重要人物写简介入志,列各类型的人物表入志,随党政部门、企事业单位、乡镇机构内容记述历任正职领导姓名。记述人物要注意解决记述内容见事不见人的问题;解决为在世人物立传的问题;解决人物入志范围过宽的问题;解决写人物简介和人物传略界限不清问题;解决记述人物出现错漏问题;解决人物传、人物简介排序混乱的问题;解决领导人照片入志存在的问题。     

Robust Performance-Based Design Optimization of Steel Moment Resisting Frames

The concept of performance-based design is considered in the framework of Robust Design Optimization (RDO) for the design of steel structures. The RDO problem is treated as a two-objective optimization problem where the initial construction cost and the variance of the maximum interstorey drift for the 10% in 50 years hazard level are considered as the problem objectives to be minimized. The structural performance is evaluated by means of the reliability demand and resistance methodology of the FEMA-350 guidelines in order to take into account both uncertainty and randomness in a consistent manner. The structure is designed to respond for different levels of seismic hazard levels with a desired confidence. The limit-state damage cost is used as a measure for the assessment of selected designs that have been obtained through the proposed RDO formulation. The non deterministic finite element problem encountered, is solved using the Monte Carlo Simulation method. The NSGA-II algorithm has been combined with the Evolution Strategies optimization algorithm for solving the two-objective optimization problem at hand.     

Partis, Pari et Théorie des Jeux

This article looks at the "problem of the divisions" - a dialogue between two persons or more - to bring out its structure, in which religious and ethical elements are intermingled. It then offers a reevaluation of the argument of the wager, which is seen here as a sort of prefiguration of game theory rather than as the solution to a problem of probabilities. Although their correspondence suggests that Fermat and Pascal believed they were offering a solution to the same problem, they were not - as written by Fermat, the problem of divisions is a problem of probabilities, but ultimately Fermat did not solve the same problem as Pascal.     

关于古朝鲜几个问题的研究

本探讨了中国东北古朝鲜族的名称问题,箕子东迁古朝鲜问题,“八条之教”问题,古朝鲜与内地中央王朝关系问题等等。在一些关键问题上,提出了自己的看法,驳正了有关歪曲的观点和不实之论,并对古朝鲜族对中华民族所作的历史贡献给予了充分肯定。     

十世班禅与西藏和平解放及班禅问题的解决

班禅返藏问题,不仅是十世班禅自己的问题,也是和平解放西藏、实现国家统一和民族团结的一大核心问题。他首先争取中共中央对自己地位的承认,提出解决班禅问题的方案和意见;接着在和平解放西藏的谈判中使班禅问题的解决在协议中规定下来。十七条协议签订后,他又采取积极措施使书面规定得到具体实现,顺利返藏。班禅问题得以解决的根本原因是中国共产党维护国家统一和民族团结的决心与正确的方针、步骤,十世班禅也作出了积极的努力和贡献。     

Programming Models for Facility Dispersion: The p-Dispersion and Maxisum Dispersion Problems

The p-dispersion problem is to locate p facilities on a network so that the minimum separation distance between any pair of open facilities is maximized. This problem is applicable to facilities that pose a threat to each other and to systems of retail or service franchises. In both of these applications, facilities should be as far away from the closest other facility as possible. A mixed-integer program is formulated that relies on reversing the value of the 0–1 location variables in the distance constraints so that only the distance between pairs of open facilities constrain the maximization. A related problem, the maxisum dispersion problem, which aims to maximize the average separation distance between open facilities, is also formulated and solved. Computational results for both models for locating 5 and 10 facilities on a network of 25 nodes are presented, along with a multicriteria approach combining the dispersion and maxisum problems. The p -dispersion problem has a weak duality relationship with the (p-1)-center problem in that one-half the maximin distance in the p-dispersion problem is a lower bound for the minimax distance in the center problem for (p-1) facilities. Since the p-center problem is often solved via a series of set-covering problems, the p-dispersion problem may prove useful for finding a starting distance for the series of covering problems.     

The Spatial Search Problem: Structure and Complexity

The paper discusses structure and complexity of the spatial search problem. From a set of assumptions it derives a rather general version of the spatial search problem and investigates some of its fundamental properties. Most importantly, the paper shows that the decision problem corresponding to the spatial search problem in this general version is NP-complete.     

社会分层视野中的教育消费

在我国转型时期社会分化加剧以及国家对教育收费制度改革的社会背景下,不同阶层家庭在教育消费上表现出结构性差异,其背后反映的是教育公平以及社会公平问题。     

Results of a New Approach to Solving the p-Median Problem with Maximum Distance Constraints

Considerable interest has been directed in the past to developing approaches for solving the p-median problem with maximum distance constraints. All current solution techniques consider potential facilities to be located only at nodes of the network. This paper deals with the solution of this problem under the condition where facility placement is not restricted to nodes. The examples given show that improvement in weighted distance can be obtained by solving the unrestricted site problem. In addition, feasible solutions can be obtained for smaller numbers of facilities than possible by all nodal facility placement.     

The p‐Regions Problem. p‐区域问题

The p‐regions problem involves the aggregation or clustering of n small areas into p spatially contiguous regions while optimizing some criteria. The main objective of this article is to explore possible avenues for formulating this problem as a mixed integer‐programming (MIP) problem. The critical issue in formulating this problem is to ensure that each region is a spatially contiguous cluster of small areas. We introduce three MIP models for solving the p regions problem. Each model minimizes the sum of dissimilarities between all pairs of areas within each region while guaranteeing contiguity. Three strategies designed to ensure contiguity are presented: (1) an adaptation of the Miller, Tucker, and Zemlin tour‐breaking constraints developed for the traveling salesman problem; (2) the use of ordered‐area assignment variables based upon an extension of an approach by Cova and Church for the geographical site design problem; and (3) the use of flow constraints based upon an extension of work by Shirabe. We test the efficacy of each formulation as well as specify a strategy to reduce overall problem size.     

Handling Large Numbers of Attributes and/or Levels in Conjoint Experiments

Conjoint models have become an established modeling tool for geographical studies. At the core of conjoint models is experimental design, which combines attributes into profiles according to statistical principles. Orthogonal design is the widely used method of experimental design. This method, however, has the problem that task sizes rapidly increase with increasing numbers of attributes and/or levels. Efforts have been spent to overcome this problem, but all existing proposals are based on orthogonal design, providing no radical solution to the problem. In this paper, we attempt to deal with the problem using a new experimental design method that has recently attracted the attention of international statisticians—uniform design, a method that can easily deal with large numbers of attributes and/or levels. The basic idea of this method is to select experimental points (or profiles) that are uniformly scattered in the problem domain, based on the theorem that uniformly distributed experimental points will ensure that the estimated model has the minimum gap with the true model. The key of uniform design is therefore to select designs that have maximum uniformity, which indicates to what extent the experimental points provided by a design are uniformly distributed. The new method is illustrated and tested by a case of intercity transport mode choice.     

THE MAX‐P‐REGIONS PROBLEM*

ABSTRACT In this paper, we introduce a new spatially constrained clustering problem called the max‐p ‐regions problem. It involves the clustering of a set of geographic areas into the maximum number of homogeneous regions such that the value of a spatially extensive regional attribute is above a predefined threshold value. We formulate the max‐p ‐regions problem as a mixed integer programming (MIP) problem, and propose a heuristic solution.     

A Web of Interests: Stalemate on the Disposal of Spent Nuclear Fuel

The United States has adopted a policy of geological disposal to resolve the problem of permanent disposition of highly radioactive spent nuclear fuel (SNF), but has been unable to implement this policy. This study draws upon literature on policymaking and interest group representation to examine that inability. It develops and explores a conceptualization of policy stalemate to analyze the case.
The study finds that the United States has arrived at a stalemate over SNF disposal policy in part because of its pluralist system of interest group representation, and in part because of the nature of the problem. The case demonstrates how, in a pluralist system, the interaction of interests over a complex and difficult policy problem can result in stalemate. Few of the involved interest groups have sufficient incentives to either implement current SNF disposal policy or to revisit the policy. Barring significant change in the nature of the problem, the balance of interests, or other factors in the policy environment, the stalemate will continue.
The central question of this symposium is how institutionalized systems of interest group representation manage competing demands for environmental protection with demands for energy. In the case of SNF disposal, the United States in effect is managing these competing demands by not addressing them. SNF disposal policy does not appear to pose directly the expected tradeoff between demands for environmental protection and accessible energy, as the conflict tends to be defined primarily in environmental terms. However, the trade-off is implicit; failure to resolve the problem will eventually impact continued access to nuclear energy.     

The credibility of scientific expertise in a culture of suspicion

Abstract

Scientists and other technical experts in the UK increasingly complain that their credibility is being eroded and that the public is ever more reluctant to believe what they say. This is sometimes seen as a part of a larger 'problem of trust', afflicting all our major institutions: science attracts suspicion because it is no longer perceived as independent and is regarded instead as tied to the interests of those institutions. But it is suggested here that the credibility of scientific expertise actually remains remarkably high, that the so called 'problem of trust' is not a problem at all, and that the rise of a culture of suspicion, which does admittedly cause experts some slight inconvenience at times, is nonetheless something they should welcome and encourage.     

历史建筑木柱防腐措施研究

本工作针对在浙江温州地区历史木构建筑修缮中发现的木柱根部腐朽严重的问题,提出对其的保护措施,分析其腐朽原因。为此,通过查阅相关国内外规范及经验做法、实地调研、勘察检测、实验室进行材料试验、数据统计分析等办法进行综合分析,得出木柱腐朽的主要原因为冷凝水。采用通过对比实验研究发现,传统历史建筑中的木柱础做法和对木柱进行防水处理可以较好地解决木柱腐朽的问题。     

民初至抗战前夕国立大学教师的聘任问题

近代国立大学教师的聘任问题,不仅是一个复杂且尚需深入研究的问题,也是一个极具现实意义的问题。民国初年至抗战前夕,政府对大学教师的聘任进行了制度规范,国立大学在实际操作时也有相应的政策,或规定或按照对学术成果的判定来鉴别受聘者是否有真才实学。但政府制度运作和大学实际操作之间在很多方面存在着不同程度的分歧。