曹四夭钼矿区水文地质特征研究

曹四夭钼矿是河南省地勘二院2010年新发现的一个特大型钼矿。通过详查工作发现,山前断裂F1断层的下盘迎水一侧基岩裂隙含水层富水性中等-强,是矿坑的主要充水含水层。矿床主要直接充水因素为矿体基岩裂隙水和大气降水。将来矿山开采应注意基岩裂隙水和临时性暴雨形成的洪水对矿坑的危害。矿区水文地质条件的研究对未来矿山设计、开发及相邻矿区水文地质工作具有指导和借鉴意义。     

Integrated inventory-transportation model by synchronizing delivery and production cycles

This paper develops an integrated single-vendor multi-buyer inventory-transportation synchronized supply chain model. In this paper, the decisions of truck assignment and routing are also considered and as a result, a series of vehicle routing problems (VRP) are required to be solved. Due to the highly complicated objective function and the NP-hard VRP problems, the problem cannot be solved analytically. Hence, meta-heuristics are proposed. By means of the numerical examples and a case study, the meta-heuristics developed are shown to be very effective in solving such comprehensive supply chain models, and the results so obtained are promising.     

浅谈大截面深井开挖施工

本文介绍了深井泵房开挖前的分析策划及施工过程调整。质量、环境、安全在施工中要高度重视,从而确保工程的顺利推进。     

基于不同行业领域的江苏省大中型工业企业研发机构投入产出情况分析

以江苏省大中型工业企业研发机构为研究对象，分析了不同行业领域的大中型工业企业研发机构的投入和创新产出情况，为不同行业领域的企业研发机构发展方向提供参考，从而促进江苏省大中型工业企业研发机构的健康发展。     

The effect of a roundabout corridor's design on selecting the optimal crosswalk location: A multi-objective impact analysis

Crosswalks located at mid-block segment between roundabouts can provide a good balance among delay, carbon dioxide (CO₂) emissions, and relative difference between vehicles and pedestrians speed. However, when considering local pollutant criteria, the optimal crosswalk location may be different to that obtained for CO₂. This paper described a multi-objective analysis of pedestrian crosswalk locations, with the objectives of minimizing delay, emissions, and relative difference between vehicles and pedestrians speed. Accounting for the difference between global (e.g., CO₂) and local pollutants (monoxide carbon, nitrogen oxides, and hydrocarbons) was one the main considerations of this work. Vehicle activity along with traffic and pedestrian flows data at six roundabout corridors in Portugal, one in Spain, and one in the United States were collected and extracted. A simulation environment using VISSIM, Vehicle Specific Power, and Surrogate Safety Assessment Model models was used to evaluate traffic operations along the sites. The Fast Non-Dominated Sorting Genetic Algorithm (NSGA-II) was implemented to further search optimal crosswalk locations. The results yielded improvements to both delay and emissions by using site-optimized crosswalks. The findings also revealed that the spacing between intersections widely influenced the optimal crosswalk location along a mid-block section. If the spacing is low (<100 m), the crosswalk location will be approximately in 20%–30% of the spacing length. For spacing values between 140 and 200 m, crosswalks would be located at the midway position. When a specific pollutant criterion was considered, no significant differences were observed among optimal crosswalk data sets.     

Bifurcation of attritional and large losses in an additive IBNR environment

In certain segments, IBNR calculations on paid triangles are more stable than on incurred triangles. However, calculations on payments often do not adequately take large losses into account. An IBNR method which separates large and attritional losses and thus allows to use payments for the attritional and incurred amounts for the large losses has been introduced by Riegel (see Riegel, U. (2014). A bifurcation approach for attritional and large losses in chain ladder calculations. Astin Bulletin 44, 127–172). The method corresponds to a stochastic model that is based on Mack’s chain ladder model. In this paper, we analyse a quasi-additive version of this model, i.e. a version which is in essence based on the assumptions of the additive (or incremental loss ratio) method. We describe the corresponding IBNR method and derive formulas for the mean squared error of prediction.     

多参数线性规划

本文讨论了多个参数的线性规划问题。建立了参数的最优比例结构的概念,并给出了确定这种比例的一种方法。     

创造财富的财政政策分析

历史上的经济危机都是因为币值不稳定造成的,而最终的解决方法均是财富的创造.根据我国货币发行量M2和居民消费价格指数可计算出我国价格对货币供应量的滞后期,并由此说明只有在滞后期内采用积极的财政政策举办大型公共工程以吸收多发行的货币,才能避免经济危机的发生.     

Ex ante efficiency implies incentive compatibility

We show that when agents become informationally negligible in a large economy with asymmetric information, every ex ante efficient allocation must be incentive compatible. This means that any ex ante core or Walrasian allocation is incentive compatible. The corresponding result is false for fixed finite-agent economies with asymmetric information. An example is also constructed to show that the ex post version of the result does not hold. Furthermore, we show that the result is sharp in the sense that it will fail to hold if one relaxes any of the main assumptions, namely, strong conditional independence on the information structure, strict concavity on the utility functions, type independence on the utility functions and endowments.      

大股东治理与管理者过度投资行为

管理者的机会主义引发了企业的过度投资行为。本文以我国A股上市公司2005～2006年的横截面数据为基础,分析了大股东持股及其相关的股权结构特征对管理者过度投资行为的治理效应。结果表明:(1)大股东持股比例与企业的过度投资水平呈倒N型的曲线关系,即大股东对管理者过度投资行为的监督作用同时存在激励效应和防御效应;(2)非国有大股东对管理者过度投资行为的监督更有力;(3)次大股东的存在有利于发挥大股东的激励效应,抑制大股东的防御效应,特别是当大股东不处于控股地位时。