曲面响应法预测砂浆性能的试验研究

本试验以砂浆性能为研究对象,采用Box-Behnken的中心组合实验设计及响应面分析方法对腻子粘结强度进行预测研究。试验选用三因素三水平的响应曲面分析法,建立了粘结强度的二次多项数学模型,并以粘结强度为响应值作响应面和等高线,考察了水粉比、灰粉比和胶粉比对粘结强度的影响,并根据实际选择响应曲面方程,利用最小二乘法估计相应的系数,剔除最不显著因素,建立最终的数学方程。结果表明:该预测模型能很好地描述粘结强度与水粉比、灰粉比和胶粉比之间的关系,可以对腻子粘结强度进行分析和预测,为砂浆性能研究提供一种新方法。     

The future of the chef occupation and the food and beverage sector after the COVID-19 outbreak: Opinions of Turkish chefs

The aim of the present study is to reveal the opinions of the chefs who working as a manager in the kitchen department within the food and beverage sector about what changes might have occurred in their occupation and food and beverage sector after the COVID-19 outbreak. The data were collected through online interview forms and content analysis was used as a data analysis method. The findings reveal three main categories: general opinions after the COVID-19 outbreak, changes that could occur in the food and beverage sector after COVID-19 outbreak, and thoughts for the future of the chef occupation after the COVID-19 outbreak. Since this paper is the first to reveal the opinions of the chefs about what changes might have occurred in their occupation and food and beverage sector after the COVID-19 outbreak, and no similar study could be found in the existing literature, these findings are original.     

言用的跨学科概念平台—信用的基本问题研究系列之一

各学科的信用研究一直没能实现很好的进展。一个重要根源是，传统的信用解释不能为各学科的信用研究提供一个统一的概念平台，以促成各个学科的研究形成合力。通过对信用本身特性的分析可以发现，信用的本质性规定可重新界定为“信用即信任之效用”。这一新界定能够使多学科的信用概念找到一个统一的基础，能够消解传统信用概念使用中的矛盾，能够很好地理顺信用与其他相关概念的关系，从而可以成为多学科信用研究的概念平台。     

Picking on the poor: the contradictions of theory and neo-liberal critique. A response to Stasja Koot's paper on the contradictions of capitalism for Indigenous tourism in the South African Kalahari

The relevance of neo-liberal critique of a community-owned, but commercially managed lodge, is examined with regard to Stasja Koot's paper on “The contradictions of capitalism” published in the Journal of Sustainable Tourism in 2016. Koot focuses on the ≠Khomani Bushmen's relationship with !Xaus Lodge in the Kalahari Desert. His argument locates this small facility as an exemplar of the global contradictions of capitalism in the tourism sector. My response critiques Koot's methodology, theory and conclusions. It provides the missing history of the project discussed, and details the financial evidence that cautions Koot's speculative interpretations. My analysis cautions the relevance and use of Koot's application of David Harvey's Marxist-derived theory of spatial and temporal fixes. This response's assessment is that Koot's conclusions are arrived at without sufficient supporting evidence, and that his theory-led argument conceals a myriad of contextual contradictions that question the unproblematic application of Harvey's theory into a political economic context for which it was not designed. Some comment is offered on researcher positions and responsibilities and on how to interpret responses offered by ≠Khomani sources, whose own playful (and sometimes wilful) exploitation of researchers results in information that must always be triangulated for accuracy.     

水锁作用对煤体瓦斯涌出影响的研究与发展

矿井工作面瓦斯超限严重影响着矿井安全生产和生产效率,现用解决该问题的方法存在局限性,不能广泛适用于所有矿井。针对该问题,采用水及含添加剂水阻碍和延缓煤体内瓦斯解吸速度,以达到降低工作面瓦斯涌出量的目的。本文通过对其抑制原理相关研究的介绍,为同类工作面瓦斯超限治理提供基础理论依据。     

探索性因子分析中统计方法的比对研究

本文以探索性因子分析中统计方法的选择为目标,针对在许多应用探索性因子分析的文献中存在的统计方法选择不当致使计算结果失真这一现象,对探索性因子分析中的15种统计方法进行了比对研究,并给出了建议。     

我国餐厨垃圾回收体系的研究现状分析

餐厨垃圾既有污染环境的危害性,又有可利用的资源性,因此为保护环境,实现经济的绿色发展,需要对餐厨垃圾回收体系的建立进行探讨。本文在对相关文献进行综述性研究的基础上,详细描述了我国餐厨垃圾回收体系的理论研究现状,并分析了在实践过程中,我国餐厨垃圾回收体系构建的特点和趋势。     

榆林市某羊场舍饲陕北白绒山羊羔羊死亡原因研究

本文旨在研究榆林市某羊场舍饲陕北白绒山羊羔羊的死亡情况及死亡原因,为治疗和预防羊场疾病提供理论依据。本文主要采用实地考察和访谈方式,了解羊场的饲喂、管理、配种以及产羔情况,并对羊场的消毒防疫、发病症状、病理变化和羔羊死亡数量做了详细记录。经统计分析得出羔羊死亡主要原因:繁殖障碍,哺乳失常,管理不当,肺炎和痢疾等。其中肺炎占死亡总数的13.9%,痢疾占死亡总数的68.7%,繁殖障碍死亡占死亡总数的5.2%;哺乳不当弱胎饥饿占死亡总数的7.8%;管理不善及其他原因占死亡总数的3.5%。主要防治措施:以预防为主,治疗为辅,标本兼治,加强饲养管理,全群注射三联四防苗,使羔羊死亡情况得以控制。     

建筑工程监理与施工技术创新的关系研究

建筑工程监理与施工技术这二者的关系并不是相互割裂,相互独立的,本文将对二者关系进行探究。