寄生虫的抗药性管理     

史喜菊  段俊秀  汪明 《中国兽药杂志》2003,37(9):41-44

抗药性在畜禽寄生虫中普遍存在，且具有一些共同的特征。了解这些共同特征将会为寄生虫的抗药性管理提供一些新观点、新思路。本文着重讨论了寄生虫的抗药性问题，并对其共同特征做了描述；同时也论述了寄生虫综合管理方案，旨在通过总结一种寄生虫的综合管理方案，为其他寄生虫病的控制开辟一条新途径。  相似文献   

基于SOLID EDGE的EBOM表的生成     

李健  韦灵南 《农机化研究》2004,(4):185-187

论述了BOM的分类和组成方法，介绍了基于Solid edge的EBOM的生成过程，即在Access2002中构建EBOM表，利用Visual Basic编写应用程序，并把在Solid Edge基础上建立的产品模型的物料数据自动生成到EBOM表中。  相似文献   

Repeated physical disturbances and the stability of sub‐tropical coral communities in Hong Kong,China     

Tze‐Wai Tam  Put O. Ang Jr 《水产资源保护:海洋与淡水生态系统》2008,18(6):1005-1024

• 1. This paper reports on the dynamics of the coral community structure at A Ma Wan (AMW) and A Ye Wan (AYW) in Tung Ping Chau, Hong Kong, focusing on data collected before and after the summer typhoon seasons in 1997 to 1999. This period (1999) experienced the highest frequency of severe tropical cyclones to hit Hong Kong with one cyclone being the strongest to hit in the last 23 years (1984 to 2006).
• 2. This is part of a long‐term monitoring programme of subtropical coral communities that has been set up in AMW since May 1997 and AYW since May 1998 with nine fixed position 40 m long transects and 0.5 m × 0.5 m permanent quadrats laid at 5 m intervals along each transect. A total of 45 scleractinian coral species from 21 genera (12 families) was recorded, with 40 species in AMW and 32 species in AYW recorded at the beginning of the study.
• 3. Multidimensional scaling ordinations showed distinct spatial variations in the coral communities within and between sites. These variations were probably a result of the differential effects of the repeated cyclone impacts on the communities. Cyphastrea serailia, Goniopora lobata, Montipora peltiformis and Pavona decussata were the dominant species most strongly affected by cyclone impacts at AMW, experiencing a 6.2–16.2% loss of mean area cover during the study period. Some dominant species (e.g. P. decussata) in AYW also experienced a 6.5–14.3% loss of mean area cover within the same period.
• 4. Overall, these coral community structures appeared relatively stable and resistant to repeated physical disturbances. However, they may have low resilience towards more severe disturbances in the future. Preserving the resilience of coral communities/species in Tung Ping Chau should be one of the main goals of coral conservation strategies for the island.

Copyright © 2008 John Wiley & Sons, Ltd.  相似文献   

梯田基线设计与简易放线法     

党福江 《中国水土保持》1992,(9):16-19

梯田基线设计,多采用经验法,等高等宽不好兼顾,“大弯就势,小弯取直”往往只能定性,不能量化,由此设计出的梯田埂线,难以得出最佳梯田断面。如根据地形图等高线走向趋势,选择代表地面走向的等高线,通过概化分析,以数学函数式表达等高线,使其横贯坡面切割等高线为最少,以此作为梯田地埂基线,由其函数对应值,在实地进行坐标放线,即可做到等高布设、等宽兼顾和“大弯就势,小弯取直”定量化,既满足机械作业对曲率半径的要求,也避免了施工时的大切大垫。  相似文献   

隰县试区土地适宜性评价及其开发利用规划研究     

姚建民  马百旺 《山西农业科学》1993,21(3):9-18

在深入调查的基础上,运用模糊综合评判方法,以土地调查小斑为评价单元,评价了隰县黄土高原残塬沟壑试验区的土地利用适宜性;依据广泛适宜性指数划分了若干土地开发适宜性类型区;采用多目标局势决策方法制定出了农、林、果、草4个地类的开发利用方案。该项研究成果已得到初步实施,对于同类地区土地资源的开发利用具有广泛的借鉴意义和重要的推广价值。  相似文献   

北京市标准化果园管理质量模糊综合评价研究——Ⅱ·BASIC程序设计     

姚允聪  王有年 《北京农学院学报》1992,(2)

本文基于果园管理质量模糊综合评价的指标体系,单指标评价数学模型和综合评价数学模型的研究,编制了实施评价的BASIC程序。程序设计包括了原始数据输入与打印,评价结果打印,和评价咨询意见的输出等主要语句。利用本程序可以对被评价果园的管理质量进行优劣排序,亦可以对管理质量指标中较劣等的项目进行校正和提供校正咨询。  相似文献   

Institutional performance and participatory paradigms: Comparing two groups of watersheds in semi-arid region of India     

《国际水土保持研究(英文)》2020,8(2):164-172

Watershed development programmes carried out in different agroclimatic conditions in India resulted in beneficial impact in terms of productivity enhancement and natural resources conservation, but less attention paid to institutional and participatory aspects. This paper explored the performance of various institutions regarding execution of watershed development programmes in semi-arid region of India. Recorded observations from documents maintained at watershed level and information collected through primary survey as well as focus group discussion with different types of stakeholders were used for analysis. The results indicated lacunae in participatory aspects during programme implementation process like monitoring activities, management of common property resources and equity. Gap in linkages and differential level of performance of various watershed level functionaries indicates the necessity for corrections in the structures and linkages pattern for sustainability of the infrastructure and institutions. The study also showed unequal priorities by the implementing agencies towards institutions, land and water resources development, production enhancement activities and fodder resources development as well as rationalities of technical, economic, financial, political and social aspects among the watersheds.  相似文献   

兴宁市粮食增产模式攻关试点工作方案   总被引：1，自引：1，他引：0  

吴新龙  幸让新  肖雄 《现代农业科技》2015,(2)

介绍了兴宁市粮食增产模式攻关试点总体思路、基本原则和目标任务,结合该市市情,进一步阐述了兴宁市粮食增产模式攻关的技术模式和攻关内容,为兴宁市粮食增产模式攻关和高产创建提供参考。  相似文献   

凉山规模化猪场仔猪猪瘟免疫程序的制定     

黄卫平  王强 《四川畜牧兽医》2012,39(1):25-27

本试验通过研究免疫状况良好的母猪群所产仔猪获得母源抗体的方式,仔猪体内母源抗体的持续时间,仔猪不同免疫程序的免疫效果等,从而制定出仔猪猪瘟的最佳免疫程序。  相似文献   

语文现代化进程中的方言电视节目探析     

陈长旭 《信阳农业高等专科学校学报》2012,22(2):75-77

近年来,我国的方言电视节目呈现出一派火热局面。冷静客观地看待方言电视节目的热播现象,对于我们准确把握传媒发展方向、正确制定传播策略具有重要意义。本论文将从方言电视节目的类型、内容以及语言特点等几个方面对方言电视节目的兴起原因以及未来的发展前景进行分析研究。  相似文献