无封装条件下牛奶存放质量电子鼻分

选用气敏传感器阵列动态响应中不同时刻的响应值来表征无封装牛奶测试样本,借助于主成分分析(PCA)、Fisher判别分析(FDA)研究了牛奶开封后不同存放天数的质量变化情况,并给出了最优表征区间.以最优表征区间响应值的平均值为样本的表征值,进行了牛奶质量的PCA、FDA分析.结果表明:无论是利用不同时刻的响应值或是平均值来表征样本,PCA、FDA均能鉴别出牛奶开封后的质量变化情况.因此,用电子鼻分析无封装条件下牛奶质量的变化是一种有效手段.     

不同处理工艺杨梅果汁风味成分的电子鼻检测

为评价不同处理方法对杨梅果汁风味的影响,利用电子鼻PEN3系统对杨梅原汁、原汁离心澄清处理以及自制的共混改性聚砜膜（孔径小于100nm）除菌澄清处理的3种不同杨梅果汁芳香成分进行检测分析。通过电子鼻系统动态采集杨梅果汁芳香成分并得到其响应值,再利用主成分分析法、线性判别法进行数据分析,结果表明利用电子鼻能够无损检测不同处理工艺的杨梅果汁风味成分。     

供应链中的“牛鞭效应”研究综述

社会经济的发展、市场需求的波动及供应链自身的发展演进,增加了企业生产运作中的不确定性,给供应链管理带来了巨大挑战。而作为供应链系统运作低效的主要表现之一的“牛鞭效应”,成为供应链管理研究的焦点。该研究对供应链中“牛鞭效应”问题的研究现状进行了分析和总结。首先,说明了供应链中普遍存在的“牛鞭效应”问题对供应链的危害性;其次,对影响“牛鞭效应”的因素进行了分析,并建立模型进行量化;最后,分别从传统模式下和电子商务模式下2个角度分析了减弱“牛鞭效应”的方法,并对未来供应链“牛鞭效应”问题的研究进行了展望和预测。     

“核高基”项目引领高校信息教育改革之路

《国家中长期科学和技术发展规划纲要》对基础软件国产化作了整体战略布局。基于这一视角,高等院校的信息教育改革迫在眉睫,需要在教育理念、人才培养目标等方面积极探索,精心设计教学过程,灵活调整教学模式,提高学生的计算机技术应用水平和综合素质,从而为我国基础软件行业培育创新型人才,以实际行动支持民族产业。     

电子导师制在农科类专业教学中的应用

介绍了电子导师制的内涵,针对农科类专业学习资源短缺、教学方法陈旧、导师严重不足、师生交流困难的问题,提出了电子导师制在农科类专业教学中的应用策略。     

苹果轮纹病发生规律及防治措施

[目的]为提高苹果品质及经济效益。[方法]调查了苹果轮纹病的发生规律,并采用物理、化学、农业措施进行防治。[结果]苹果轮纹病的发生具有一定规律,并掌握了一套合理的防治措施。[结论]为今后的防治工作提供了借鉴。     

The application of medical informatics to the veterinary management programs at companion animal practices in Alberta,Canada: A case study

Companion animals closely share their domestic environment with people and have the potential to, act as sources of zoonotic diseases. They also have the potential to be sentinels of infectious and noninfectious, diseases. With the exception of rabies, there has been minimal ongoing surveillance of, companion animals in Canada. We developed customized data extraction software, the University of, Calgary Data Extraction Program (UCDEP), to automatically extract and warehouse the electronic, medical records (EMR) from participating private veterinary practices to make them available for, disease surveillance and knowledge creation for evidence-based practice. It was not possible to build, generic data extraction software; the UCDEP required customization to meet the specific software, capabilities of the veterinary practices. The UCDEP, tailored to the participating veterinary practices’, management software, was capable of extracting data from the EMR with greater than 99%, completeness and accuracy. The experiences of the people developing and using the UCDEP and the, quality of the extracted data were evaluated. The electronic medical record data stored in the data, warehouse may be a valuable resource for surveillance and evidence-based medical research.     

基于双向伺服力反馈的电子节气门控制系统

针对目前电子节气门控制系统中存在的缺乏驾驶临场感、非线性和未建模动态不确定性等缺点,结合临场感主从遥操纵理论,提出基于双向伺服力反馈控制策略的电子节气门控制系统.驾驶员目标开度与节气门实际开度位置偏差经动态鲁棒补偿器控制电驱油门踏板角位移,使驾驶员感知反馈力;同时位置偏差通过基于等效控制的模糊滑模控制器控制电子节气门实际开度,使其准确跟踪目标开度.通过仿真验证了所设计的控制策略的有效性.试验采用电控六自由度驾驶模拟器,结果表明,所设计的电子节气门控制系统能够精确修正开度位置偏差,增强驾驶临场感,具有较强的鲁棒性和自适应性.     

基于Zachman企业架构理论的黑龙江省林业电子政务系统建设

以Zachman的企业架构理论为基础,提出了黑龙江林业电子政务系统企业架构框架的总体设计,用以描述黑龙江省林业电子政务信息系统建设的标准、规范和方法,从理论上指导黑龙江省的电子政务的建设,提高政府和企业科学决策水平.     

Effect of nose ringing and stocking rate of pregnant and lactating outdoor sows on exploratory behaviour, grass cover and nutrient loss potential

Nose ringing of outdoor sows is practiced to reduce grass sward damage for environmental reasons but conflicts with natural behaviour considerations. We investigated effects of ringing pregnant and lactating outdoor sows on foraging and explorative behaviour, grass cover and nutrient deposition. The experiment included both ringed and unringed sows. For unringed sows the paddocks were either used continuously throughout the experiment or divided into two and sows were moved half way through the experimental period leaving the first used paddock for regrowth. Ringing did not prevent the sow's rooting, but rooting was less pronounced, when sows were ringed. On average, ringing increased grass cover from 14% to 38% and from 64% to 81% in paddocks with pregnant and lactating sows, respectively. In paddocks with unringed sows kept at a double density and followed by a resting period, the grass cover in autumn was restored to a high degree in paddocks with pregnant sows. In lactating sow paddocks the level of inorganic N was high but with no significant relation to extent of grass cover. In pregnant sow paddocks the soil inorganic N content was significantly reduced by increased grass cover and at 60% grass cover soil inorganic N content was at a low level. From the experiment it was evident that although ringing did have a positive environmental effect, it was not the main factor influencing potential losses. Management choices in terms of feeding, animal density and nutrient distribution are considered to be at least as important.