$$\mathcal{D}$$-optimal Minimum Support Mixture Designs in Blocks

An easy method to construct efficient blocked mixture experiments in the presence of fixed and/or random blocks is presented. The method can be used when qualitative variables are involved in a mixture experiment as well. The resulting designs are -optimal in the class of minimum support designs. It is illustrated that the minimum support designs are more efficient than orthogonally blocked mixture experiments presented in the literature and only slightly less efficient than -optimal designs.     

西北地区发展减灾农业的问题与对策

西北地区自然灾害频发,生态环境日益脆弱,水资源极度缺乏,农业生产受干旱威胁日益加深,发展减灾农业是当务之急。在发展减灾农业的方式上,要突出重点,以抗旱防灾为主,又要根据不同区域灾害特征,探索发展特色减灾模式。文章针对西北地区如何发展减灾农业提出了相关对策。     

密封胶在拉索索端结构中的应用研究

索端结构是拉索的防护薄弱环节,在索端结构中增加密封胶措施是索端密封的一次探索。选取了几种不同的密封胶分别与拉索聚乙烯护套进行粘结,对提高斜拉索的耐久性和安全性有一定的意义。     

建立县级公共气象服务体系的实践与思考

介绍了德庆县气象局开展公共气象服务系统试点改革的具体实施情况,分析了试点中遇到的一些问题,探索如何建立以发展现代农业气象服务为主的县级农村公共气象服务体系。     

The effect of information on consumers' willingness to pay for natural and organic chicken

This study examined the effect of definitions for organic and natural on willingness to pay a premium for organic over natural chicken. Data were collected using surveys and experimental auctions that were conducted before and after information was presented. Before information, approximately two‐thirds of participants inaccurately equated the requirements of natural with those for organic. After information, nearly 50% increased their premium, while 30% decreased their premium. Logistic regression results showed that consumers who had overestimated the requirements for natural were most likely to have an increased premium after information, with significantly higher bids for organic. For those who decreased their premium after information, awareness of consuming genetically modified (GM) foods was a key variable. The non‐genetically modified (non‐GM) requirement of organic appears to be of low value to some consumers. Overall, consumer confusion regarding organic and natural standards may be having substantial impacts on the two markets.     

数字电子技术基础实验教学现状的探讨

数字电子技术基础是工科电子类专业学生的一门重要的专业基础课程。本文首先探讨了当前实验教学中存在的一些问题:教学观念落后、教学内容陈旧、教学方式僵化、考核模式单一。然后针对这些问题提出了具体解决方法:转变"重理论,轻实践"的观念、更新实验内容、转变实验教学方式、改进实验考核方式。这些方法可为数字电子技术基础实验教学的改革提供参考。     

大学生课外体育锻炼意识与行为的调查分析

采用问卷调查法、文献资料法和数据统计法,对地方院校大学生参与课外体育活动现状进行调查,探讨大学生课外体育锻炼活动的特点和规律。为培养大学生体育兴趣和终身体育意识,提高课外活动效果,促进高校体育教育的发展提供对策。     

大型物流仓储类建筑防火安全设计方法探析

随着中国物流产业的蓬勃发展,越来越多大型物流仓储中心出现,但是随之而来的一些消防问题也摆在眼前,如防火分区面积过大、疏散问题、消防设施布置等。运用了性能化防火设计评估的方法对类似建筑进行分析模拟,并提出相关优化方案是一个比较可行的解决办法,通过该方法能够提高建筑安全性,增加设施的可靠性。     

高职高等数学精品课程建设的探索与研究

本文以教学实践活动为基础,文章从课程建设的思想、师资队伍建设、教学资源建设、教学制度建设和教法改革五个方面,对高职高等数学的课程建设进行了全面的阐述。     

医药学专业有机化学实验教学绿色化改革的探索与实践

报道了对医药学专业有机化学实验进行绿色化改革的措施。通过新实验技术的应用、实验内容的更新、对环境友好试剂和反应的选用、实验的微量和半微量化、实验的重新组合、废物的回收利用等措施的实施,收到了有机实验绿色化的良好效果。