A1—10%Pb—钢双金属材料水平连铸复合结晶器的选用

本文从冷却速度及其对连铸复合材料组织和性能的影响的角度分析所选择的结晶器材料的适用性,在此基础上,选用了石墨结晶器外加水冷铜套的连铸复合系统来生产Al—10％Pb—钢双金属材料,并定量地给出了石墨结晶器上下型的主要尺寸。     

直齿圆锥齿轮弧齿厚的计算

本文介绍利用球面渐开线方程计算圆锥齿轮背锥齿形弧齿厚的方法,并通过实例指出利用当量圆柱齿轮计算弧齿厚的理论误差。     

浅析邓小平社会控制思想

人类社会的存在和发展,需要稳定的社会秩序,而稳定社会秩序的维系则有赖于社会控制.邓小平从我国社会主义初级阶段实际出发,通过长期实践逐步摸索出了一整套行之有效的社会控制思想,其内容主要包括以解放和发展生产力为控制基点;以改革开放为控制动力;以实现社会发展为最高目标;以"三步走"模式为控制策略;以实现人民利益为控制机制.在这一理论指导下,中国社会保持了平稳有序的发展.     

On the Advantage of Quantity Leadership When Outsourcing Production to a Competitive Contract Manufacturer

This study investigates a supply chain comprising an original equipment manufacturer (OEM) and a contract manufacturer (CM), in which the CM acts as both upstream partner and downstream competitor to the OEM. The two parties can engage in one of three Cournot competition games: a simultaneous game, a sequential game with the OEM as the Stackelberg leader, and a sequential game with the CM as the Stackelberg leader. On the basis of these three basic games, this study investigates the two parties' Stackelberg leadership/followership decisions. When the outsourcing quantity and wholesale price are exogenously given, either party may prefer Stackelberg leadership or followership. For example, when the wholesale price or the proportion of production outsourced to the CM is lower than a threshold value, both parties prefer Stackelberg leadership and, consequently, play a simultaneous game in the consumer market. When the outsourcing quantity and wholesale price are decision variables, the competitive CM sets a wholesale price sufficiently low to allow both parties to coexist in the market, and the OEM outsources its entire production to this CM. This study also examines the impact of the supply chain parties' bargaining power on contract outcomes by considering a wholesale price that is determined via the generalized Nash bargaining scheme, finding a Stackelberg equilibrium to be sustained when the CM's degree of bargaining power is great and the non‐competitive CM's wholesale price is high.     

Simultaneous estimation and inference for multiple response variables

Multivariate data arise frequently in biomedical and health studies where multiple response variables are collected across subjects. Unlike a univariate procedure fitting each response separately, a multivariate regression model provides a unique opportunity in studying the joint evolution of various response variables. In this paper, we propose two estimation procedures that improve estimation efficiency for the regression parameter by accommodating correlations among the response variables. The proposed procedures do not require knowledge of the true correlation structure nor does it estimate the parameters associated with the correlation. Theoretical and simulation results confirm that the proposed estimators are more efficient than the one obtained from the univariate approach. We further propose simple and powerful inference procedures for a goodness-of-fit test that possess the chi-squared asymptotic properties. Extensive simulation studies suggest that the proposed tests are more powerful than the Wald test based on the univariate procedure. The proposed methods are also illustrated through the mother’s stress and children’s morbidity study.     

耦合KdV方程组的孤波精确解

本文利用一种简明的方法得出一类耦合KdV方程组的孤波精确解。     

顶板支护新概念

锚杆支护这种支护技术已成功地应用于各类矿山、土建工程中,然而其支护机理的变化、锚杆长度、初锚力等参数的选择,在应用中仍有许多不足之处。本文通过对整个锚杆支护系统的全面分析,提出了一个顶板支护的新概念,对于改善安全生产条件、降低成本均有一定意义。     

公元11世纪后的气候变冷对宋以后经济发展的动态影响

公元11世纪后我国气候显著变冷,由此发生了农业生产、土壤、植被的显著恶化,游牧民族与汉族力量对比的适应性变化,中国人口和经济重心的适应性南移,以及在此基础上对中国传统政府统治模式所造成的巨大挑战。理解这一气候变化及其经济动态影响,乃是理解11世纪后两宋时期经济发展和政府治理出现新气象的重要理论前提和基础;对研究当代气候变暖具有一定现实意义。     

大学生村官工作压力源调查及其与心理健康关系研究

为探讨工作压力对大学生村官心理健康水平的影响,本文采用工作压力源问卷和一般心理健康问卷,对山西省太原市521名大学生村官进行问卷调查,结果显示,男生角色冲突和躯体症状得分均明显高于女生;角色冲突和角色模糊对大学生村官的心理健康水平的躯体症状、焦虑和抑郁三个维度及总分都具有最强的预测力。因此,工作压力源能够在一定程度上预测大学生村官的心理健康水平。