论我国养猪业的可持续发展

养猪业在中国的发展很快,自20世纪80年代以来,中国养猪业的发展快于其他农业产业。到2002年底,我国的猪肉总产量达到4326 6万t,名列世界第一,这一产量占到世界猪肉总产量的45%以上。养猪业是我国重要的农业产业之一,我国有很长的养猪历史,养猪业未来的可持续发展对我国农村经济的发展是十分重要的。从总体上看,我国的养猪业还有一定的成本优势,养猪业还有较大的发展空间。为了促进我国养猪业的可持续发展,我国政府应制定出有利于养猪业发展的政策和法规,以降低我国养猪业的饲料成本,以及增加对促进对养猪业发展有重要作用的科技投入。     

农村图书馆(室)知识转移的障碍分析与消除对策研究

从社会交流的角度探讨图书馆知识转移的内涵,分析农村图书馆(室)知识转移存在的各种障碍,并提出了消除障碍的对策和措施。     

Hand‐assisted laparoscopic adhesiolysis of extensive small intestinal adhesions in a mare after breeding injury

In this article we report the course of disease in a mare following severe vaginal injury during natural cover. Although the genital injury healed completely, the mare developed extensive intra‐abdominal intestinal adhesions causing complete small intestinal obstruction 2 years after the incident. The adhesion was not accessible during initial emergency laparotomy and a standing, hand‐assisted laparoscopic adhesiolysis and jejuno‐jejunal end‐to‐end anastomosis were subsequently performed. The mare was subjected to euthanasia 10 weeks after surgery due to recurrence of abdominal pain. The pertaining literature is discussed in regards to this case.     

降低养殖业中氮污染的措施

氮是畜禽粪便中造成环境污染的主要物质。降低养殖业中氮污染的措施是减少畜禽粪便中氮的排出量和加强畜禽粪便的处理利用，本文对此进行了综述。     

手提二冲程汽油机摩擦特性研究

通过对手提二冲程汽油机的仿真试验,测量了在不同的、转速、润滑及环境温度下的发生擦伤的载荷和表面本体温度,经过摩擦学的理论分析计算,得出了微凸体瞬现温升的计算公式,确定了以临界膜厚比值作为关键参数的方法,提出了合理控制转速是延长使用寿命的途径。     

The breeding system of rubber (Hevea brasiliensis): an evaluation of controlled hand pollination methods

Summary Controlled hand pollinated pistils of rubber were observed using fluorescence microscopy to assess the efficiency of the universally-employed method for the production of progeny for plant breeding. The controlled hand pollination method conducted in the morning resulted in the deposition of a mean of 15.6 pollen grains on the stigma, with no stray pollination observed. Over 36% of the pistils had the potential to set fruit.Pollinations conducted in the afternoon at the normal time of anthesis, had double the fruit set potential of morning pollinations as measured by penetration of ovules by pollen tubes. Pollinator efficiency also varied, with excessive damage to stigmas resulting in reduced pollen germination and tube growth. There were differences between clones in both female and male fertility, in the proportion of pistils with more than three carpels and in the production of small abnormal stigmas. There was no difference in pollen tube growth following self- or cross-pollination, indicating that the self-sterility mechanism of rubber operates in the ovary. Pollen could be stored for 5 days at 5°C and 75% RH with a 22% loss of fertility.     

当今计算机病毒防治的尝试

计算机实验室承担教学和学生业余上机的任务,所以,计算机病毒成为我们最大的隐患,处理不好将给教学带来极大的困扰。因此,本人花费大量时间对计算机病毒防治进行了研究,下面把计算机病毒防治的一些心得介绍给大家,仅供参考。     

灭鼠施饵方法试验初报

为探索防治高原鼠兔的工作效率 ,采用对比试验的方法 ,进行了机械撒施 ,人工洞口投施及不同撒施带距的试验。结果表明 ,机械撒施 ,人工洞口投施两处理防治效果差异不显著 ,撒施带距5 0 m和 2 5 m两处理间 ,其防治效果也不显著。     

关于农机手培训所用教学方法的研究

探讨农机手培训所用教学方法;分析农机手现状、社会对农机手的需求情况、传统农机手培训教学方法存在的弊端;在农机培训学校办学条件和农民收入有所改善的情况下,依据有关教育教学理论,以计算机等新技术做为技术支撑,归纳和设计出10种适用于农机手培训的教学方法;本文提出的10种农机手培训所用教学方法可供农机培训学校参考.     

A Character Recognition Based on Feature Extraction

This thesis analyzes the theory of image processing and feature extraction, character feature is investigated in this thesis, including width, intersection, chain-code, the way of structure of character is used, a hand-written character recognition and entry system is developed. It is proved feature is simple and definite.