乙二醇机组的温度模糊控制器设计与仿真

针对我国通信行业和计算机行业大型机房耗电量大的现状，提出了一种乙二醇机组控制系统。介绍了它的工作原理，阐述了它的总体控制方案，并重点阐述了采用温度模糊PID控制器对室内温度进行调节。仿真和实验结果表明：采用温度模糊控制器的系统运行稳定、可靠性高、节能效果明显，具有广阔的应用前景。     

黑龙江蒙古族饮食习俗述略

本文介绍了黑龙江蒙古族饮食习俗的内容与特点。     

纳西族空间观念之色彩表象

空间是抽象的 ,只有对它们进行具体的表象 ,才能将抽象还原成具体。无论在纳西族民俗中 ,还是在其他民族的民俗中 ,色彩常常成为对空间方位进行表象的具体手段之一。由色彩所表象的空间不仅决定着民俗活动的性质 ,也规范着民俗活动的形式与内容。本文从前空间、原空间等方面对纳西族民俗中空间的色彩表象作了介绍和分析     

农产品网购意愿影响因素及作用机理研究——基于参照效应视角的分析

以整合型科技接受和使用模型(UTAUT)和价值接受模型(VAM)为基础,通过构建参照群体、参考价格、积极在线评论与感知价值、感知风险以及购买意愿之间的关系模型,从参照效应视角实证分析了农产品网购意愿的影响因素及作用机理,并探讨了消费者农产品质量与安全意识在参照效应影响网购意愿中的调节作用.结果表明:参照效应对农产品网购意愿有显著影响;感知价值和感知风险在参照效应影响网购意愿中均发挥了中介作用,但感知价值的中介作用显著大于感知风险;消费者农产品质量与安全意识在参照效应影响网购意愿中部分地发挥了调节效应.其中,对参照群体和积极在线评论的调节效应显著,即网购过程中,消费者越是重视农产品质量与安全,参照群体的意见和积极在线评论对其网购意愿的影响就会越凸显.     

A log rank type test in observational survival studies with stratified sampling

In randomized clinical trials, the log rank test is often used to test the null hypothesis of the equality of treatment-specific survival distributions. In observational studies, however, the ordinary log rank test is no longer guaranteed to be valid. In such studies we must be cautious about potential confounders; that is, the covariates that affect both the treatment assignment and the survival distribution. In this paper, two cases were considered: the first is when it is believed that all the potential confounders are captured in the primary database, and the second case where a substudy is conducted to capture additional confounding covariates. We generalize the augmented inverse probability weighted complete case estimators for treatment-specific survival distribution proposed in Bai et al. (Biometrics 69:830–839, 2013) and develop the log rank type test in both cases. The consistency and double robustness of the proposed test statistics are shown in simulation studies. These statistics are then applied to the data from the observational study that motivated this research.     

天津城市游憩商业区(RBD)初步研究

一、问题的提出 随着经济的发展和信息时代的来临,城市越来越以多样化的功能显示出其区域核心的地位,城市不仅担当起区域经济、文化、政治、信息服务的中心,更成为旅游活动的中心,而且旅游中心的功能作为城市共性的功能会随着城市的发展得到不断强化.     

Ethnic Identities under the Tourist Gaze

This paper examines the construction of Bai ethnicity and Bai identity on the tourist market in Dali, Dali Bai Autonomous Prefecture, Yunnan, China. Focusing on how the social landscape of Dali has changed in response to the development of tourism, this paper explores how Bai ethnicity is advocated as a product loaded with potential economic values. The author discovers that ‘commerce of authenticity’ (T. Oakes, Tourism and modernity in China. London, Routledge, 1998 Oakes, T. 1998. Tourism and modernity in China, London: Routledge.  [Google Scholar]), and different forms of ethnicity and artefacts promoted in the tourist market have not drowned out the sense of being ethnically Bai. Instead, the tourist industry has become a daily reminder of ethnicity to both insiders and outsiders by making people more self-conscious and reflexive about the ‘cultural stuff’ that they may have previously taken for granted, or may have left unattended. This paper demonstrates how locals actively appropriate state-defined categories and reshape them into the repertoire they desire.     

民俗文化与甘肃旅游业的发展

甘肃旅游业的一大优势在于丰富的少数民族民俗文化旅游资源。大力发展甘肃少数民族的民俗文化资源,形成以各民族典型节日庆典为主要内容、以民俗美为核心的民俗旅游体系,充分发挥少数民族旅游胜地立体化旅游资源优势,对推动甘肃的经济具有很强的实践性和深远的意义。     

Hard thresholding regression

In this paper, we propose the hard thresholding regression (HTR) for estimating high‐dimensional sparse linear regression models. HTR uses a two‐stage convex algorithm to approximate the ?₀‐penalized regression: The first stage calculates a coarse initial estimator, and the second stage identifies the oracle estimator by borrowing information from the first one. Theoretically, the HTR estimator achieves the strong oracle property over a wide range of regularization parameters. Numerical examples and a real data example lend further support to our proposed methodology.     

基于雨课堂的电工电子学混合式智慧教学方法研究

《电工电子学》是高等学校针对非电类工科专业开设的一门有关电工、电子技术的重要专业基础课。针对《电工电子学》传统理论教学空洞乏味、师生互动不足、学生学习兴趣不足等问题,在《电工电子学》课程教学中引入雨课堂智慧教学工具,论述了雨课堂从课前、课上和课后三个方面实践的特点和使用方法,实践表明,基于PPT和微信的雨课堂混合传统教学的教学方法可以实现师生实时线上互动,建立多元化科学评价机制,激发学生学习主动性,活跃课堂气氛,提高学生学习积极性,改善本门课程的教学效果。