基于对象建模的农机产品CAPP系统设计与应用

利用对象建模技术,通过抽象与重组形成CAPP系统的一般对象模型,并把对象、关联及操作等映射成数据库表和程序实体,结合农机产品CAPP实例论述了工艺过程卡对象模型的实现流程,分析了选单等的设计重用方法。实践证明,CAPP系统开发过程中,只需开发一个编辑窗口,而非对应每一个数据表开发相应的编辑窗口。当数据表发生结构改变时可通过修改数据窗口来实现。采用这种方法,同一个选单就可以被不同的窗口所共用,使系统的开发效率大大提高,同时系统的结构也非常合理,根据作业机的主体结构相似性,可应用于各类农机制造的工艺设计过程。     

我国古代农业推广及其对现代的启示

我国古代农业推广是我国农业生产中重要的组成部分,农业推广内容和形式多样,成果显著,对社会影响深远。现代农业推广工作仍然是专业的农业生产活动之一,是现代农业生产不可或缺的一部分,现代农业推广需要有专业技术支撑和市场经济体制的支持。     

浅谈当前农技推广工作现状、问题与建议

随着市场经济发展需要,农技推广工作,只有适应新形势、创新新方法,才能推动农业科技的快速发展。分析了当前农业科技推广中的现状与存在问题,并提出几点建议,谨供参考。     

海原县农机化教育培训问题与对策

通过对海原县农机化教育培训工作调查，提出了海原县农机化教育培训工作存在的问题及发展对策。     

柴达木盆地农业节水灌溉的几种技术探讨

随着我国水资源供需矛盾的日益尖锐和水资源环境的日趋恶化,节水已成为我国解决水问题的有效途径之一。本文介绍几种节水技术,并分析利弊,反映柴达木盆地农业节水新观点、新思路,为农业节水更好的发展提供参考。     

甘肃省干旱半干旱地区降水的研究

本文通过对甘肃省降水资料的具体分析,指出了在干旱、半干旱地区降水的主要特征,如暴雨的特殊性、固体降水与海拔关系、降水量与海拔关系、降水量与作物产量关系等,并对如何提高降水利用率,发展农业生产等问题进行了探讨。     

生物药剂防治苹果树腐烂病的田间试验

河南省自1987年开始在孟县、卢氏等县265亩苹果园中进行生物药剂治疗苹果树腐烂病的试验示范。以刮皮法和划刻法用农抗120、S-921和843康复剂涂抹病疤,一年后在发病季节调查。以刮皮法用农抗120处理的病疤,治愈率达100％,无一复发。以划刻法用农抗120处理的病疤治愈率为78-90％,以S-921和843康复剂处理的治疗效果达100％。作者认为这些生物药剂可取代福美砷治疗苹果树腐烂病。     

Farm and Personal Characteristics of the Clientele of a Community-based Animal Health Service Programme in Northern Malawi

The social background, farm characteristics, indicators of income and self-evaluation returns of 96 randomly selected users of a Basic Animal Health Service (BAHS) programme in northern Malawi were compared with those of 96 matched past-users and 96 non-users, respectively. All 288 farms were visited between July and October 1997. Data analysis was performed using univariate and multivariate techniques. The results showed that, on average, BAHS users had larger cattle herds (16.3) than part-users (14.7) or non-users (12.4). Similarly, the annual yields of crops were higher for users compared to either of the other groups. Users occupied better houses and owned a larger number of farm and household items than did part-users or non-users. A third of all farmers were engaged in additional income generation to lessen the risk of poverty. However, analysis of the livestock management and the educational background of the farmers suggested that usage of the BAHS programme was not only determined by already existing `wealth'. Improved livestock husbandry and management measures, which do not require capital investment, were more frequently applied by users compared to either of the other groups. Non-users and part-users had attained a lower level of education, were less open towards improved farming methods and felt less knowledgeable than BAHS users. The average straight-line distances from farms using BAHS to their respective village animal health worker (2.2 km) or veterinary assistant (2.9 km) were similar but varied according to ecological zone. Intensified extension and awareness meetings in villages will be required to get more non-users involved in BAHS.     

黄河大柳树灌区土壤类型特征与合理开发途径

该文分析了黄河大柳树灌区土壤类型形成条件与分布格局和主要土壤类型的基本特征,在此基础上结合发展灌溉农业对土壤条件的要求,提出土壤资源合理利用与发展灌溉农业的有关问题。     

全球气候变化对我国干旱区影响分析

<正> 全球变暖问题已经是全世界关注的焦点,不仅各国科学家们进行了大量的研究,各国政府也耗费巨资组成了政府间专家组(IPCC,Intergovernmental panel on ClimateChange研究气候变化的影响。IPCC包括3个工作组,Ⅰ.科学分析工作组(Working