高校图书馆提供就业服务探析     

卢继红 《农业图书情报学刊》2013,(9):189-191

高校图书馆开展就业信息服务是图书馆情报教育职能的扩大和延伸,同时也是新时期高校图书馆工作的创新与发展,在阐述当前高校图书馆提供就业服务现状的基础上,着重分析高校图书馆开展就业服务的内在的必要性,并根据自身特点提出一系列具体措施。  相似文献   

漏磁腐蚀检测器新型探头机构的设计     

杨博霖  臧延旭  张元 《油气储运》2013,32(8)

为了解决漏磁腐蚀检测器在管道内检测过程中因探头机构姿态不稳、偏磨及支撑弹簧易折断、易震颤带来的一系列问题,对检测器所用探头机构进行研究,设计制造了一种全新的探头机构.该机构增加了辅助支撑弹簧和柔性连接铰链,很好地解决了传统探头机构存在的不足.该机构的检测探头将以往探头加耐磨层结构变为整体灌装探头壳形式,改善了检测探头的提离值,提高了检测信号的可靠性.与传统探头机构相比,该机构的使用能够有效提高检测数据的可靠性和稳定性.  相似文献   

自动进排料密闭式固态发酵罐的设计     

耿丽娟  刘洋  刘嘉  何平  张良 《饲料与畜牧》2013,(8):22-24

为解决当前固态发酵劳动强度大,生产效率低的问题,设计内置纵向排列带扇形缺口的浅盘组和升降旋转控制刮板的中心轴来实现自动进排料和翻料的固态发酵罐,可实现自动化生产,原位灭菌,提高生产效率。  相似文献   

病毒杀虫剂在我国无公害茶园防治中的应用现状与展望     

刘阳  陆建良  郑新强 《茶叶》2013,39(3):130-133

茶叶作为一种食品，其安全问题受到越来越高的关注。病毒杀虫剂具有专一性强、安全性高、持效作用长、能有效地控制害虫种群密度等特点，成为生物防治的研究热点。现就病毒杀虫剂在我国无公害茶园中的应用现状进行综述，并展望未来发展趋势。  相似文献   

Prediction of daily reference evapotranspiration by a multiple regression method based on weather forecast data     

Junzeng Xu  Weiguang Wang  Shihong Yang  Qi Wei  Yufeng Luo 《Archives of Agronomy and Soil Science》2013,59(11):1487-1501

Prediction of daily reference evapotranspiration (ET ₀) is the basis of real-time irrigation scheduling. A multiple regression method for ET ₀ prediction based on its seasonal variation pattern and public weather forecast data was presented for application in East China. The forecasted maximum temperature (T _max), minimum temperature (T _min) and weather condition index (WCI) were adopted to calculate the correction coefficient by multilinear regression under five time-division regimes (10 days, monthly, seasonal, semi-annual and annual). The multiple regression method was tested for its feasibility for ET ₀ prediction using forecasted weather data as the input, and the monthly regime was selected as the most suitable. Average absolute error (AAE) and root mean square error (RMSE) were 0.395 and 0.522 mm d^?1, respectively. ET ₀ prediction errors increased linearly with the increase in temperature prediction error. A temperature error within 3 K is likely to result in acceptable ET ₀ predictions, with AAE and average absolute relative error (AARE) <0.142 mm d^?1 and 5.8%, respectively. However, one rank error in WCI results in a much larger error in ET ₀ prediction due to the high sensitivity of the correction coefficient to WCI and the large relative error in WCI caused by one rank deviation. Improving the accuracy of weather forecasts, especially for WCI prediction, is helpful in obtaining better estimations of ET ₀ based on public weather data.  相似文献   

电气工程及其自动化专业生产实习模式研究     

鲁敏  王洪坤 《农业网络信息》2012,(10):138-140

从生产实习的现状入手,以石河子大学电气工程及其自动化专业为例,分析了生产实习的重要性,并就存在的问题提出了解决方案。  相似文献   

Long-Term Effect of Fertilizer and Rice Straw on Mineral Composition and Potassium Adsorption in a Reddish Paddy Soil     

Yu-lin LIAO  Sheng-xian ZHENG  Jun NIE  Jian XIE  Yan-hong LU  Xiao-bo QIN 《农业科学学报》2013,12(4):694-710

Increasing K⁺ adsorption can be an effective alternative in building an available K pool in soils to optimize crop recovery and minimize losses into the environment. We hypothesized that long-term fertilization might change K⁺ adsorption because of changes in the chemical and mineralogical properties of a rice (Oryza sativa L.). The aims of this study were (i) to determine clay minerals in paddy soil clay size fractions using X-ray diffraction methods and a numerical diagram-decomposition method; (ii) to measure K⁺ adsorption isotherms before and after H₂O₂ oxidation of organic matter, and (iii) to investigate whether K⁺ adsorption is correlated with changes in soil chemical and mineral properties. The 30-yr long-term fertilization treatments caused little change in soil organic C (SOC) but a large variation in soil mineral composition. The whole-clay fraction (<5 μm) corresponded more to the fertilization treatment than the fine-clay fraction (<1 μm) in terms of percentage of illite peak area. The total percentage of vermiculite-chlorite peak area was significantly negatively correlated with the total percentage of illite peak area in the <5 μm soil particles (R=-0.946, P<0.0006). Different fertilization treatments gave significantly different results in K⁺ adsorption. The SOC oxidation test showed positive effects of SOC on K⁺ adsorption at lower K⁺ concentration (?120 mg L^?1) and negative effects at higher K⁺ concentration (240 mg L^?1). The K⁺ adsorption by soil clay minerals after SOC oxidization accounted for 60–158% of that by unoxidized soils, suggesting a more important role of soil minerals than SOC on K⁺ adsorption. The K⁺ adsorption potential was significantly correlated to the amount of poorly crystallized illite present (R=0.879, P=0.012). The availability of adsorbed K⁺ for plant growth needs further study.  相似文献   

卡尔曼滤波技术在汽车故障解码器中的应用研究     

郭秀丽  陆怀民 《林业机械与木工设备》2010,38(10)

目前常用的汽车故障解码器不能诊断故障码不出现的各类故障,为了扩展解码器的诊断功能,提出了一种利用基于模糊自适应卡尔曼滤波的径向基函数神经网络处理解码器数据流的新方法.该方法通过MATLAB软件与ACCESS数据库相结合编制故障诊断程序,可实现汽车电喷发动机无故障码的故障诊断.同时,还将基于模糊自适应卡尔曼滤波的径向基函数网络与BP网络进行了比较.结果表明,基于模糊自适应卡尔曼滤波的径向基函数神经网络诊断速度快且准确,更适合用于故障诊断,如果将本研究所编制的程序固化到解码器中,将会使其进一步向智能化方向发展.  相似文献   

基于电力线载波的养殖场环境监控终端设计     

燕斌  吉旸 《现代农业科技》2013,(19):343-345

设计了一种基于电力线载波的环境监控终端设计,使得养殖现场能够通过普遍存在的电力线组成局域网,并且通过WEB服务器与远程控制中心通讯,实现了远程集中控制在中小型养殖场的低成本解决方案。  相似文献   

国内收获机品牌产品线观察     

杨晓蓓 《当代农机》2010,(8):36-38

构筑攻防兼备的产品线一直是农机企业梦寐以求的愿望。从2004年国家开始实施农机购置补贴政策以后,各企业都加快了新产品的开发,收获类机械的产品型谱得到了不断的完善。本文依据《2010年国家支持推广的农业机械产品目录》及各企业公开的信息,就国内市场重点收获机品牌企业产品线布局情况进行调查和分析。  相似文献