微型节能保鲜冷库开发技术——二维象限决策法     

胡云峰  李刚  李喜宏  关文强 《天津农业科学》2003,9(3):18-20

以微型节能保鲜冷库开发为标的,以保鲜增值(利润)率Ri为纵坐标,市场占有率Rs为横坐标,利润和市场占有率的期望值为原点,研究开发微型节能保鲜冷库的二维象限决策法推广技术。结果表明,微型节能保鲜冷库的最佳推广区域和最优保鲜品种象限区Ⅰ>Ⅱ>Ⅳ>Ⅲ。  相似文献   

高等院校医学生信息能力的培养与提高       

张宁  李秉严 《农业环境科学学报》2004,(2)

 

揭示了信息能力的涵义，阐述了提高医学生信息能力的重要性，并提出了医学生信息能力培

养的内容和实施途径。

  相似文献   

A decision-analytic approach to the optimal allocation of resources for endangered species consultation     

Sarah J. Converse  Kevin J. Shelley  Steve Morey  Jeffrey Chan  Andrea LaTier  Carolyn Scafidi  Deborah T. Crouse  Michael C. Runge 《Biological conservation》2011,(1):319-329

The resources available to support conservation work, whether time or money, are limited. Decision makers need methods to help them identify the optimal allocation of limited resources to meet conservation goals, and decision analysis is uniquely suited to assist with the development of such methods. In recent years, a number of case studies have been described that examine optimal conservation decisions under fiscal constraints; here we develop methods to look at other types of constraints, including limited staff and regulatory deadlines. In the US, Section Seven consultation, an important component of protection under the federal Endangered Species Act, requires that federal agencies overseeing projects consult with federal biologists to avoid jeopardizing species. A benefit of consultation is negotiation of project modifications that lessen impacts on species, so staff time allocated to consultation supports conservation. However, some offices have experienced declining staff, potentially reducing the efficacy of consultation. This is true of the US Fish and Wildlife Service’s Washington Fish and Wildlife Office (WFWO) and its consultation work on federally-threatened bull trout (Salvelinus confluentus). To improve effectiveness, WFWO managers needed a tool to help allocate this work to maximize conservation benefits. We used a decision-analytic approach to score projects based on the value of staff time investment, and then identified an optimal decision rule for how scored projects would be allocated across bins, where projects in different bins received different time investments. We found that, given current staff, the optimal decision rule placed 80% of informal consultations (those where expected effects are beneficial, insignificant, or discountable) in a short bin where they would be completed without negotiating changes. The remaining 20% would be placed in a long bin, warranting an investment of seven days, including time for negotiation. For formal consultations (those where expected effects are significant), 82% of projects would be placed in a long bin, with an average time investment of 15 days. The WFWO is using this decision-support tool to help allocate staff time. Because workload allocation decisions are iterative, we describe a monitoring plan designed to increase the tool’s efficacy over time. This work has general application beyond Section Seven consultation, in that it provides a framework for efficient investment of staff time in conservation when such time is limited and when regulatory deadlines prevent an unconstrained approach.  相似文献   

不同类型种茎及其药剂处理对款冬花出苗率的影响     

张爱香  马海莲  刘会清  王晓涛  李雪萍  仝在利 《北方园艺》2011,(22):157-159

为了防止款冬花种茎腐烂,提高出苗率,通过采用不同类型的种茎及对异地种茎进行药剂处理,研究其对款冬花出苗率的影响.结果表明:采用野生种茎和异地种茎,款冬花的出苗率可达到90％和55.83％,显著的高于对照.通过药剂处理异地种茎,可以大大提高款冬花的出苗率,其中药剂A、B、G、C、H处理种茎后,出苗率分别达到95％、82.5％、72.5％、72.5％、62.5％,而对照的出苗率为45％,存在显著性差异.  相似文献   

莼菜资源利用研究综述及展望   总被引：3，自引：0，他引：3  

刘美玉  习向银  罗丽娟 《长江蔬菜》2011,(10):7-10

通过分析莼菜的生物学特性、营养特性,对莼菜在营养保健、医学价值、治理污水、净化水质方面的研究现状进行了综述,并对今后的研究方向提出了展望,以期为人们综合利用莼菜资源、为莼菜的深加工应用提供科学依据。  相似文献   

信息素质教育与医学专业课程整合研究     

余恩琳 《农业环境科学学报》2007,(1)

 

阐述了信息素质教育与医学专业课程整合的含义及其理论基础，提出了信息素质教育与医学专业课程整合的层次和策略。

  相似文献   

多属性决策在小流域坡面治理中的应用     

王真  郭怀成  王丽婧  王金凤 《水土保持通报》2006,26(6):74-78

小流域坡面治理工程优化配置是一个多属性决策问题,但由于信息缺乏,决策往往由专家主观判断,结果依赖专家的经验。采用多种方法对海西海流域的坡面治理进行排序,并对排序结果进行综合分析,识别出林地与水平梯田结合的治理方式为当地坡面治理的最佳措施,解决了不完备信息下的决策问题和单一方法的决策结果随意性问题。研究结果可为当地坡面治理决策提供科学的决策依据。  相似文献   

软构件技术在作物管理智能决策系统设计中的应用   总被引：4，自引：2，他引：4       下载免费PDF全文

朱艳  曹卫星  王绍华  潘洁 《农业工程学报》2003,19(1):132-136

基于知识模型和生长模型的作物管理智能决策系统是一个综合了多领域的作物信息和专家知识，集成了多方面相关支持技术的决策系统。因此，如何设计好系统中的各功能模块，使其便于非系统开发者对其精华部分的学习和理解，同时又能即插即用，利于系统的维护，是系统成功与否的关键。以小麦作物为例，论述基于软构件技术的作物管理智能决策系统设计中软件平台的选用、系统的构件化结构设计与实现过程以及数组在接口上的传递等关键技术，从而为农业管理决策系统的开发提供一种构件化的基础框架。  相似文献   

模拟退火法在汪清林业局森林可持续经营决策中的应用研究   总被引：1，自引：1，他引：0  

欧阳君祥 《林业资源管理》2005,(6):55-58

以异龄林为对象,应用模拟退火法,探讨了确定林分水平上异龄林最佳可持续经营决策的方法,以期为我国森林可持续经营的生产实践提供参考。  相似文献   

Insecticide screening with isolated nerve preparations for structure-activity relationships     

Kazu Takeno  Keiichiro Nishimura  James Parmentier  Toshio Narahashi 《Pesticide biochemistry and physiology》1977,7(5):486-499

The sciatic nerve-sartorius muscle preparation from the frog, the nerve-muscle preparation from the crayfish, and the abdominal nerve cord preparation from the crayfish have been compared for their sensitivity to various insecticides. The crayfish nerve cord was the most sensitive to insecticides and had a broad spectrum of sensitivity. A method was developed with this preparation to compare a large number of synthetic pyrethroids for their potencies to stimulate and block the nerve which is the primary target site. Both stimulating and blocking actions on the nerve can be assessed with this preparation. Certain pyrethroids are active insecticidally despite their weak nerve action, whereas some other pyrethroids are relatively moderate in killing insects despite their potent nerve action. Thus the new method can be effectively used to establish the true structure-activity relationship of synthetic pyrethroids or any other insecticides acting directly on the nerve.  相似文献