论生物多样性与建设海南国际旅游岛的关系

经过多年的研究和实践,人们已深刻地认识到,海南省的发展战略应该积极发展服务型、开放型和生态型经济,形成以旅游业为龙头、以现代服务业为主导的特色经济结构。显然要实现这个宏伟的目标,生物多样性的保护和持续利用就是最根本和最关键的问题。如果作为生态旅游基本资源的季节性雨林、红树林、海洋生物资源和农业生物多样性被毁,一切都将是一纸空文。本文就拟简略地探讨一下有关这些方面的问题,并提出一些建议供有关方面参考。     

农业结构调整与传统蚕丝业的振兴

“东桑西移”是我国蚕丝产业结构的大调整。城市工业化已经使东部蚕区急剧萎缩和衰老，而人为措施使西部蚕区出现徒长和缺钙症。只有通过结构调整，实现东部地区的蚕业产业化，依托精品基地，挖掘潜力，才能保持东部蚕区的可持续发展。西部蚕区要借鉴东部经验，积极引进新技术、新品种和新方法，高起点建设蚕桑基地，切忌盲目发展，积极开发蚕丝业高新技术，实现东西部蚕区的合理布局和强强联合，共同振兴我国传统的蚕丝产业。     

浅析机械自动化在农业及食品包装领域的应用

我国是农业大国,也是食品包装大国,在机械自动化过程中落后于发达国家;近几年来,由于国力增强和科学技术的迅猛发展,机械自动化在此二个领域取得了较大发展。本文概述了近年来机械自动化在农业和食品包装业的发展。     

财务信息对上市公司高层变动的影响分析

上市公司高层变动受多种因素的影响,经营业绩是其中一个重要因素,能有效反映公司经营绩效的财务信息,对高层变动的影响也是不容忽视的.通过对深市样本公司的高层变动与会计信息的实证分析,进一步证明了不同会计信息对高层变动的影响程度及二者的关系,从而为投资者和管理者及其他财务数据使用者提供有效的参考依据.     

广西动物防疫物资信息管理系统的构建与应用

为实现广西动物防疫物资的信息化管理,适时掌握广西动物防疫物资的流转状况,广西壮族自治区动物疫病预防控制中心开发了“广西壮族自治区动物防疫物资信息管理系统”。该系统为B/S架构,采用JSP技术和MySQL数据库平台。该系统建立后,广西各级动物疫病预防控制机构均可通过互联网登录,及时存储和统计动物防疫物资信息数据,全程监控和实时了解物资流转情况。该系统为广西动物防疫物资的规范化管理提供了重要的技术支持,也为全区重大动物疫病防控提供了坚强的后勤保障。     

How do visual and auditory cues influence calf stress reactions at weaning?

We investigated the effects of visual and auditory information related to cow and calf stress responses at weaning. Three weaning conditions were established with physical separation only (PS), physical and visual separation (VS), and physical, visual and auditory separation (VAS). Stress responses such as vocalization and self‐grooming, and changes of three maintenance behaviors (lying, walking and grazing) were recorded for experimental cows and calves in the respective conditions. Comparison of the data revealed that the cow responses differed slightly among groups. However, the peak frequency of vocalization was higher in the PS calves than in those of either VS or VAS. Self‐grooming frequency was significantly different in calves and was high in the order of VAS, VS and PS calves. Furthermore, the percentage of time spent lying down was greater, and that of walking was less, in VAS calves than in either VS or PS calves. These results demonstrate that different information at weaning might strongly affect the stress responses of calves but not those of cows. Relative impacts of different types sensory information on stressors must be considered to plan animal‐friendly weaning.     

BP人工神经网络在家蚕杂交组合预测中的应用初探

利用前馈神经网络(BPANN)建立了家蚕杂种一代的6个经济性状的预测模型,通过验证得出,以双亲成绩作为输入神经元,利用BPANN模型预测杂种一代6个经济性状的平均预测误差均在5%左右。表明利用神经网络模型用来预测杂种一代成绩具有研究应用前景。     

河南省陆地植被净第一性生产力估算及其时空分布

基于地理信息系统和卫星遥感技术,利用地面气象数据和MODIS数据,同时考虑河南省自身实际地理和植被覆盖情况,在对最大光利用率和水分胁迫系数的获取进行改进的基础上,利用CASA模型对河南省植被净第一性生产力（NPP）进行了估算,并分析了其时空分布。结果表明,2008年河南省NPP生产量为34.87 Mt C,NPP空间分布和植被类型有密切关系,森林植被最大,然后依次是灌丛、草地、农田等。12、1和2月NPP最小,植物基本停止生长,植被的NPP只占全年的1.38％;5、7和8月的NPP最大,占全年总量的56.84％。与Miami、Montreal、Chinkugo模型相比,本研究结果和Miami模型结果最为接近,植被类型NPP均值排序和Chinkugo模型相似;与实测数据对比结果显示,模拟值接近于实测值,说明模型适用于河南省NPP的模拟。     

Demographics of cattle positive for Mycobacterium avium subspecies paratuberculosis by faecal culture,from submissions to the Cork Regional Veterinary Laboratory

The demography of bovine infections caused by Mycobacterium avium subspecies paratuberculosis (MAP) in Ireland is poorly defined. The objective of this study was to describe the demographics of cattle positive to MAP on faecal culture, based on submissions to the Cork Regional Veterinary Laboratory (Cork RVL) from 1994 to 2006. The study focused on all available faecal samples from adult cattle with non-responsive chronic diarrhoea that were submitted by private veterinary practitioners to Cork RVL for MAP culture. For each MAP-positive by faecal culture animal, data were collated from Cork RVL and Cattle Movement Monitoring Scheme (CMMS) records. Johne's disease (JD) was confirmed in 110 animals from 86 herds by the Cork RVL between 1994 and 2006, with a rate of positive cases between 15% and 18% over last four years of the study. Two breeds (Holstein/Friesian or Limousin) made up 78% of submissions. Movements were assessed for the 57 study animals with available movement information, 90% died within one year of the test and 26% tested positive in the herd they were born into. The study provides preliminary information about movement trends and demographics of animals with MAP positive submissions. Although the study area is restricted, it includes the most intensive (and economically-important) dairy region in Ireland. The demographics of JD infection from the study area are in agreement with international reports. Further work is required to determine demographic trends, incidence and prevalence of JD throughout Ireland. It is hoped this work may contribute to the development of a surveillance strategy for MAP by regional veterinary laboratories.     

大学生网络道德问题的诊断及调控对策

网络的迅猛发展带来了丰富的资源和交往的便利,也造成部分大学生网络道德情感冷漠、网络道德意识薄弱、网络道德信念缺失及网络道德行为失范等一系列问题。而网络主体、网络外部环境及网络技术是造成网络道德问题的根源。加强大学生的道德教育,构建社会、学校、家庭"三位一体"网络道德教育模式,加快网络信息技术研究,加强网络道德教育监管,强化网络道德规范,是加强大学生网络道德教育的有效措施。