重庆绕城高速公路北段水土保持生态修复措施

在对绕城高速公路北段自然条件、水土流失特点和沿线水土保持措施综合分析的基础上,基于宫胁法生态修复原理,提出绕城高速公路北段水土保持生态修复3个原则,分5个功能区建立水土保持生态修复措施体系,以实现高速公路"点、线、面"水土保持综合防护目标,对高速公路水土保持生态修复措施监测重点也进行了探讨。     

Managing Demand Uncertainty through Core Acquisition in Remanufacturing

We discuss the optimal raw material acquisition strategy for a third party remanufacturer (3PR). We specifically investigate whether a 3PR should acquire used products or cores in bulk with uncertain quality levels, or in sorted grades with known quality levels; and whether to acquire and remanufacture cores before the demand is realized (planned acquisition), or after the demand is realized (reactive acquisition), or on both occasions (sequential acquisition). When only sorted cores are acquired, we find that, (i) it is optimal to acquire cores in multiple grades to balance acquisition and remanufacturing costs; (ii) if reactive acquisition is possible, it reduces the assortment size (number of grades in which cores are acquired) and the total inventory acquired in the planned acquisition; and (iii) the optimal portfolio of grades to acquire and the optimal acquisition and remanufacturing quantities of these grades can be determined analytically. When bulk cores are acquired in addition to sorted cores, the property of reduction in assortment size of the planned acquisition is preserved. We also show that the 3PR should acquire only a fraction of the demand in planned acquisition, and leave the rest for reactive acquisition. This fraction changes during the lifecycle of a remanufactured product. Using a combination of empirical and realistic data from a smartphone remanufacturer we show that sequential acquisition increases expected profit by up to 8% and 27% over only planned and only reactive acquisitions respectively, and reduces the inventory acquired by up to 21% over only planned acquisition.     

基于Matlab的大规模电路回路分析法

用Matlab分析大规模电路的模型建立方法进行了研究,编写了相应的程序用于求解大规模电路中的电流和电压。结合一个实例,说明用Matlab分析大规模电路的方法。     

基于理性行为理论的闭环供应链绩效影响因素分析

分析相关的基础文献,就建立闭环供应链管理行为态度、行为动机、行为意向与闭环供应链绩效四者之间的关系概念模型,并提出相应的假设。同时采用问卷调查与统计分析的方法对所提出的关系概念模型进行验证。针对实施闭环供应链管理的行为态度、行为动机、行为意向与绩效之间的关系进行探讨,揭示行为态度、动机与意向对闭环供应链绩效的影响机理,并得出相应的管理启示,以期为企业实施闭环供应链管理提供决策支持。     

Strategic Grading in the Product Acquisition Process of a Reverse Supply Chain

Most recommerce providers have moved to a quality‐dependent process for the acquisition of used products. They acquire the products via websites at which product holders submit upfront quality statements and receive quality‐dependent acquisition prices for their used devices. Motivated by this development of reverse logistics practice, the aim of this study is to analyze the product assessment process of a recommerce provider in detail. To this end, we first propose a sequential bargaining model with complete information which captures the individual behavior of the recommerce provider and the product holder. We determine the optimal strategies of the product holder and the recommerce provider in this game. We find that the resulting strategies lead to an efficient allocation, although the recommerce provider can absorb most of the bargaining potential due to his last mover advantage. In a second step, we relax the assumption of complete information and include uncertainty about the product holder's valuation of the product. We show the trade‐off underlying the recommerce provider's optimal counteroffer decision and analyze the optimal strategy, using a logistic regression approach on a real‐life dataset of nearly 6,000 product submissions. The results reveal a significant improvement potential, compared to the currently applied strategy.     

论国家软实力中的基层文化建设

基层文化建设是国家软实力建设的基础,也是国家软实力建设的主要内容。加强基层文化建设,不仅是提高群众科学文化素质、满足群众日益增长的精神需求的客观要求,也是先进文化建设和国家软实力建设的需要。     

硫酸废渣中铁、锌、铜元素的迁移及其对环境的潜在影响

考察了２种硫酸废渣中铁、锌、铜元素动态淋溶的行为和进入环境的累积通量，炉底渣的潜在淋溶能力是Ｚｎ＞Ｆｅ＞Ｃｕ，沉灰渣为Ｆｅ＞Ｚｎ＞Ｃｕ；讨论了溶出金属对环境的潜在影响．     

小数分频锁相环杂散的研究

根据小数分频锁相环的工作原理,分析了小数分频杂散产生的机理,给出了分析小数分频杂散的环路线性化模型及计算公式,讨论了抑制小数分频杂散的途径,对一个实际的小数分频锁相环进行了测试,其结果与理论分析基本一致。     

火焰原子吸收光谱法测试黄花菜中的钙、锌、铜

建立了火焰原子吸收光谱法测定黄花菜中钙、锌、铜含量的方法。该方法的检出限量 :钙为 0 .0 3ug/g ,锌为0 .0 2ug/g ,铜为 0 .0 1ug/g ;平均加标回收率 :钙为 99.1% ,锌为 99.7% ,铜为 99.8%。本方法可用于不同产地黄花菜中钙、锌、铜含量的测定     

明清时期银钱比价初探

本文考察了明清时期(1368-1911)白银和铜钱这两种金属货币的比价变动情况及其主要原因。笔者认为明清时期白银和铜钱的比价一直是变动不居的,而中后期银钱比价波动尤为剧烈。从总体来看,明清时期一两白银所能兑换的铜钱数有不断上升的趋势。白银和铜钱的数量及其本身的价值、海外贸易以及当时的政治、经济等因素在不同程度上影响了银钱比价。市场上劣质铜钱的大量涌现则是导致银钱比价剧烈变动的最主要原因。