中国股市农业板块研究——基于ARCH族模型

分析中证指数农业龙头板块日收益率数据具有波动的群集性以及尖峰厚尾特点,检验其具有ARCH效应,并得出GED-GARCH模型对数据拟合效果最佳。分别利用学生t分布的TARCH模型和GED-GARCH-M模型分析板块数据不具有杠杆效应,以及存在收益和波动之间明显的正向关系。最后,利用虚拟变量法得出板块数据具有收益的正的周四效应,波动的负的周二、周四及周五效应。     

农林高校实施生态文明教育的教学模式探索

生态文明是人类在改造自然过程中为实现人与自然和谐发展的成果。高校作为生态文明教育的重要基地,应加强生态文明教育活动。顺应国家“实施生态文明,构建美丽中国”的中国梦构想,西北农林科技大学于2012年暑期首次开展生态文明教育,探索农林类高校生态文明教育教学模式的构建,分析生态文明教育的教学成效,对培养高素质创新人才进行了有益的探索。从教学目标的确立、课程设置、教学组织形式等方面对农林高校生态文明教学的教学模式进行了探索,农林高校生态文明教育应立足自身优势资源,把握生态文明教学目标,结合体验性、学生自主性和趣味性等特点开展教学,在认知、情感和行为三个层面加深学生对生态文明的理解。     

Converting education into earnings: The patterns among Hispanic origin men

We evaluate the functional form of the relationship between education and earnings for Hispanic and non-Hispanic white men to determine whether the payoffs to education vary with level of schooling, and whether credential effects can be discerned. Results indicate that for all groups the usual linear specification, while offering the advantage of parsimony, fits the data less well than more complex models. The levels model best predicts the earnings of Puerto Rican and other Spanish origin workers, while the credential model is best suited for Mexican, Central/South American, and non-Hispanic white men. Credential effects accrue to all groups, except the other Spanish, but Central/South Americans only receive added income bonuses for the completion of a college degree, whereas Mexican, Puerto Rican, and non-Hispanic white men also receive a bonus for a high school diploma.     

历史气候与两汉农业的发展

汉代与春秋战国以来同属一个温暖期 ,这一历史时期气候的相对温暖与湿润 ,带来了丰富的水资源 ,并使土壤与植被都处在良好的自然循环状态。汉代农业的发展状况 ,诸如农作物布局的变化、农产量的提高以及农业经营方式特色的形成都与之息息相关。     

我国农业信息市场发展中存在的问题与对策分析

我国农业信息市场发育中农业信息商品化程度较低,农业信息质量不高,农业信息缺乏规范性以及发展不平衡的问题比较突出,难以满足农民增收的需求.为此,本文提出了加强农业信息网络化建设,逐步实现农业信息的商品化,加强农村信息资源开发的队伍建设,建立统一、规范的农业信息市场,充分发挥其对农民增收的巨大潜力,是我国应对加入WTO挑战的必然选择.     

财政补贴林业保险的方案设计——以黑龙江垦区为例

缺少法律法规和相关配套政策的支持,是导致我国林业保险发展缓慢的主要原因之一。笔者借鉴起步较早并相对成熟的黑龙江垦区农业保险实践,通过分析黑龙江垦区农业保险的发展状况和面临的问题,紧密结合林业的特点,从补贴的标的、险种、金额、方式和标准几个方面,提出了财政补贴林业保险的方案设计。     

论农村社会结构与农村体制改革

"三农"问题的形成与我国农村社会从"再分配体制"向"市场体制"转型过程中的结构变迁有密切关联.农户的"原子化"状态、农户"寻求获取资源的方式和路径"方面存在的问题,是"三农"问题形成的根源.解决"三农"问题,必须首先研究中国当前农村社会结构及其存在的问题.在整体把握农村社会结构及其问题的基础上,针对问题,以新发展观作为价值理念,协调农村社会关系、整合农村社会结构作为改革目标,整体设计农村体制改革的内容和有序推进体制改革的路径.     

Co‐Op Advertising in Dynamic Retail Oligopolies

We study a supply chain in which a consumer goods manufacturer sells its product through a retailer. The retailer undertakes promotional expenditures, such as advertising, to increase sales and to compete against other retailer(s). The manufacturer supports the retailer’s promotional expenditure through a cooperative advertising program by reimbursing a portion (called the subsidy rate) of the retailer’s promotional expenditure. To determine the subsidy rate, we formulate a Stackelberg differential game between the manufacturer and the retailer, and a Nash differential subgame between the retailer and the competing retailer(s). We derive the optimal feedback promotional expenditures of the retailers and the optimal feedback subsidy rate of the manufacturer, and show how they are influenced by market parameters. An important finding is that the manufacturer should support its retailer only when a subsidy threshold is crossed. The impact of competition on this threshold is nonmonotone. Specifically, the manufacturer offers more support when its retailer competes with one other retailer but its support starts decreasing with the presence of additional retailers. In the case where the manufacturer sells through all retailers, we show under certain assumptions that it should support only one dominant retailer. We also describe how we can incorporate retail price competition into the model.     

论农业产业化经营契约信用风险防范的合同法创新制度

现阶段,发展农业产业化经营应重点加强农业产业化经营契约法治,通过合同法等法律手段来规范农业产业化经营龙头组织与农户之间的契约信用风险。针对不同的农业产业化经营的契约信用风险,可以充分运用我国《合同法》总则部分的创新法律制度来防犯:合同关系是否存在的风险,可以通过要约、承诺制度来规范;一方存在缔约过失的风险,可以通过追究缔约过失责任来规范;一方向对方提出履约要求被拒绝的风险,可以通过合同抗辩权制度来规范;“三角债”的风险,可以通过合同保全制度的代位权制度来保障;对方逃避履约的风险,可以通过合同保全制度的撤销权制度来保障;合同未到期一方提出不能履约的风险,可以通过追究预期违约责任来规范等。