Uncertainty and asymmetric information: An overview     

Frank Jensen 《Marine Policy》2008

This paper provides an overview of the literature on fisheries economics related to uncertainty and asymmetric information. It is argued that uncertainty is relevant in connection with present and future stock sizes and prices, while asymmetric information is important for cost functions, catches, catch per unit of effort, and effort. The literature on uncertainty and asymmetric information can be seen as providing the basis of an argument for using taxes in fisheries management. It is, therefore, surprising that over 55 countries regulate their fisheries with individual quotas, while taxes are not used at all.  相似文献   

Compliance costs and the small fisher: A study of exiters from the New Zealand fishery     

James Stewart  Kim Walshe 《Marine Policy》2008

Over 3000 predominantly small-scale fishers have exited the New Zealand's quota management system (QMS) between its inception in 1986 and 2000. This study, based on the Ministry of Fisheries database and a questionnaire sent to the exiters, establishes that compliance costs in general, and those specifically related to the QMS, were one of the most consistent reasons for exit. Uncertainty about future QMS policy and the high cost of quota were also significant factors. It appears that the small fishers’ perception of high compliance cost can be supported by industry data.  相似文献   

Theoretical Model and Dynamic Analysis of Soft Yoke Mooring System   总被引：2，自引：0，他引：2  

肖龙飞  杨建民  杨立军  李欣 《中国海洋工程》2008,22(2):195-204

As a popular solution for mooring an FPSO （Floating Production, Storage and Offloading） permanently in shallow water, the soft yoke mooring system has been widely used in ocean oil production activities in the Bohai Bay of China. In order to simulate the interaction mechanism and conduct dynamic analysis of the soft yoke mooring system, a theoretical model with basic dynamic equations is established. A numerical iteration algorithm based on error estimation is developed to solve the equations and calculate the dynanfic response of the mooring system due to FPSO motions. Validation is conducted by wave basin experimentation. It is shown that the numerical simulation takes only a few iteration times and the final errors are small. Furthermore, the calculated results of both the static and dynamic responses agree well with those ones obtained by the model test. It indicates that the efficiency, the precision, the reliability and the validity of the developed numerical algorithm and program are rather good. It is proposed to develop a real-time monitoring system to further monitor the dynamic performance of the FPSO with a soft yoke mooring system under various real sea environments.  相似文献   

双水相萃取法富集分离螺旋藻藻蓝蛋白的研究   总被引：4，自引：0，他引：4  

刘杨  王雪青  庞广昌  谢卓峰 《海洋科学》2008,32(7):30-32

以PEG／硫酸钠双水相体系,经一次萃取从钝顶螺旋藻（Spirulina platensis）细胞破碎液中富集分离藻蓝蛋白。结果表明,萃取最适宜的条件为12％PEG4000,15％Na2SO4,1％KCl,藻蓝蛋白收率为91．2％,分配系数达到8．01,分离因数达到6．33。对于螺旋藻藻蓝蛋白的富集分离,双水相萃取法与传统的盐析沉淀法相比,具有节省操作时间、简化操作过程、降低能耗和成本以及易于工艺放大等优点。  相似文献   

国土资源数据管理初探   总被引：2，自引：0，他引：2       下载免费PDF全文

史辉  李军  冯永玉 《山东国土资源》2008,24(3):45-50

在分析国土资源数据及其管理特点的基础上,基于国土资源信息化和数据资源保护,将国土资源数据整体上分为资料数据、基础数据、业务数据、管理数据和元数据5类,提出了各类数据进行计算机管理的组织方法和采用的相关技术。  相似文献   

基于C/S的矿产资源开发储量管理信息系统的研发          下载免费PDF全文

樊省状 《山东国土资源》2008,24(2)

为实现矿产资源储量管理网络实时查询功能,在目前国土资源部金土工程的储量管理软件的基础上,开发出了"基于C/S的矿产资源开发储量管理信息系统".该系统采用了结构化的程序设计方法,操作系统平台采用了MS Windows系统,程序开发平台采用了Borland公司Delphi,数据库的查询语言采用标准SQL查询语言,主要实现了矿产资源开发和储量数据的综合查询和汇总功能.  相似文献   

二长棘鲷和黄鳍鲷骨骼系统的比较     

杨太有  李仲辉 《广东海洋大学学报》2008,28(3)

对二长棘鲷和黄鳍鲷的骨骼系统进行了比较研究。结果表明,二长棘鲷脑颅中的上筛骨、侧筛骨、额骨、眶下骨、蝶耳骨、上枕骨,咽颅中的前上额骨、腭骨、舌额骨、齿骨、鳃盖骨、尾舌骨、咽鳃骨等与黄鳍鲷相应部分的骨骼有明显差异,某些特征可作属间或种间的鉴别依据。  相似文献   

单舰航线水文气象保障特点和思考     

苏轼鹏  姚忠山 《海洋技术学报》2008,27(1):122-124

文中总结单舰航线水文气象保障业务的特点、难点,并结合航线水文气象保障的现状提出一些个人的建设性建议。  相似文献   

海底孔内水合物观测系统与钻井实施     

宁伏龙  蒋国盛  吴翔  窦斌  张凌 《海洋地质译丛》2008,(4):31-35

通过耦合布设海底表面和孔内水合物观测系统获取物理、化学、微生物等数据是了解掌握海洋水合物环境动态变化、碳循环规律和资源开发技术的有效手段,据此初步提出了一套海底孔内水合物观测系统,并指出了系统的关键技术难点。而在钻井布设该孔内观测系统时,要注意防止井内安全事故的发生,充分评估安放位置处含水合物地层的地质力学稳定性并采取适当的钻井和完井方式稳定或强化含水合物地层以支撑孔内观察仪器,实现孔内长期监测。最后讨论了在我国南海实施孔内水合物观测系统的必要性,并提出了初步想法。  相似文献   

Exploring a first-principles-based model for zooplankton respiration     

Packard  Ted T.; Gomez  May 《ICES Journal of Marine Science》2008,65(3):371-378

  相似文献