山西天镇晚白垩世恐龙动物群发掘简报

文章简要介绍了山西天镇晚白垩世恐龙化石的发现、发掘概况及动物群的特征，讨论了含化石地层—灰泉堡组的时代，认为无疑应属晚白垩世。以晚白垩世蜥脚类巨龙科和鸟臀类甲龙科化石为代表，别具特色的新恐龙动物群为一突破性的发现，对它的深入研究，将对蜥脚类、甲龙类及其共生动物群的组成、性质、演化、迁徙和动物地理区的划分及探讨白垩纪末恐龙的绝灭有重要的科学意义。     

Partial International Coordination in the Great Fish War

This study extends the great fish war model of Levhari and Mirman [Levhari, D. and Mirman, L. (1980) Bell Journal of Economics 11: 322–344] by incorporating a multiple country context into the model and investigates the existence of a partial coordination Nash equilibrium. First, findings of this paper suggest that a partial coordination scheme is sustainable only in limited cases. Any coalition that has more than two member countries cannot be sustained. Second, the existence and the number of coordinating countries depend critically on the magnitude of the biological and preference parameters. Finally, if the coalition is assumed to be a dominant player, there always exist one or two welfare-improving sustainable coalitions and the size of the sustainable coalitions depends on the parameters of the problem.     

Aquaculture: an emerging issue for public concern

The present paper reviews the literature on the risks and benefits of aquaculture. By bringing together sources from both natural sciences and social sciences, we provide a synthesis of perspectives on the relatively novel activity of modern aquaculture. This review consists of three parts: first, a background to aquaculture; second, an overview of the scientific risks and benefits; and third, an introduction to the related public perception issues. We establish five main risk‐related areas: human health, environment, organizational, fish welfare, and social issues and utilize these to highlight potential divergences in expert and lay perceptions. Drawing on findings from the risk perception literature, particularly those related to previous food‐related controversies, it is argued that aquaculture incorporates a range of issues, which have already been shown to be a catalyst for public concern. As such, we conclude that, in addition to natural science studies, aquaculture requires a social science approach in order to be able to anticipate and address future controversies in a timely and efficient manner. However, to date, only few articles address aquaculture from a social science perspective, and the present paper is offered as a step in this direction.     

Generating Enhanced Fishery Rents by Internalizing Product Quality Characteristics

This paper demonstrates howadditional rents are generated in a fisherycharacterized by intraseasonal variation infish characteristics, including size,condition, and composition. Based on anexpanded conceptual model of the optimalharvest rule, fish characteristics affect preand post harvest production yields and outputprices. A dynamic empirical model, which uses asystem of quality characteristics and anhedonic equation, illustrates the complexrelationships and management choices associatedwith internalizing seafood qualitycharacteristics in a hake fishery. The modelretains the regulated open access managementsystem, but controls intertemporal andintersectoral quotas, production portfolios,and total allowable catch. Results demonstratethat including revenue-side effects frominternalizing fish quality can generatesignificantly greater rents and reduce therelative benefits of increased productionyields. If excluded, bioeconomic models canunderestimate the level of regulatory rentdissipation and overemphasize managementobjectives such as full utilization, whichcould misdirect processing decisions and resultin a suboptimal resource management plan.Implications for data collection,multidisciplinary analysis, and improvements inmarine resource management are discussed.     

基于投入--占用--产出技术的自然资源乘数分析

本文在简要介绍投入—占用—产出系数表的基础上,给出了考虑固定资产占用的资源乘数计算公式。然后,以青岛市为例,研究了青岛市的海洋鱼类资源乘数。结果表明,1997年青岛市渔业部门的海洋鱼类资源乘数,考虑固定资产占用比不考虑固定资产占用有明显增加;考虑经济系统对生态系统的影响比仅考虑生态系统对经济系统投入时的资源乘数也有所增加;进一步考虑生态系统内部各成分之间的联系时,资源乘数又有所增加。     

封闭箱体海洋水产养殖系统设计工序研究

本文旨在研究海水环境中刚性封闭箱体水产养殖系统的潜在设计工序。封闭箱体水产养殖技术通过限制并操控养殖鱼类与外部水环境相互作用以将环境影响最小化。系统的箱体单元通常紧密排布并锚泊到海底。研究关注的地理区域在加拿大不列颠哥伦比亚省乔治亚海峡。本文研究了含多个单元的箱体水产养殖系统的设计构造。设计程序包括检验以下内容:当地环境条件;多个箱体单元上受到的阻力;波浪荷载;无阻尼升沉运动;锚泊设备组件;刚性控制结构的材料应力。还讨论了操作以及其它设计要素。初步研究结果表明波浪力是至关重要的。     

基于社会化招聘成熟度模型的“投名状鱼塘”建设

F公司把社会化招聘作为树立最佳雇主品牌形象(EVP)以及建设员工价值体系(EVP)的重要途径,通过社会化招聘达到提升公司内外忠诚度的目的。本研究以中国背景下的外资企业F公司为例,探讨了复杂多变环境下F公司社会化招聘体系的建立以及建立过程中遇到的问题。     

企业实施逆向物流的关键因素分析

本文借助"鱼刺图"对企业成功实施逆向物流的关键因素展开分析,在分析的基础上提出了成功实施逆向物流的概率模型,该理论模型为今后研究逆向物流成功实施提供了理论框架。     

基于小波神经网络的鱼类价格预测研究

鱼类市场价格是影响渔民收益的重要因素,因此如何能够准确分析和预测鱼类的价格是一个十分重要的问题.论文在考虑了BP网络原形的一些缺点和不足,尝试在传统BP算法的基础上将网络神经元中的激励函数换成小波子函数,组建成的小波神经网络.通过对鲈鱼价格的预测,验证了小波神经网络的可行性,然后基于阿里巴巴的鲈鱼价格的历史数据,验证了该方法的合理性.最后开展对新疆乌伦古湖水产综合基地三类主要鱼类价格预测的实证研究,研究结果表明河鲈和梭鲈的价格会有小幅的波动,但高白鲑的价格会有大幅的提升.因此,小波神经网络作为一种传统神经网络的改进,可用于预测鱼类价格的短期预测,为水产基地的决策提供依据.     

加快开发南方草地资源,促进生态经济建设

我国南方草地资源丰富,发展草业潜力极大。本文就南方草地的现状、类型及发展草业的途径进行了探讨。