厚层砂岩顶板综采工作面初次放顶的安全技术研究

本文针对谢桥煤矿13318E厚层砂岩坚硬顶板工作面,首先提出了超前在工作面切眼顶板施工双排三花强制放顶爆破眼的技术方案。经过爆破,老顶形成了明显的裂隙,并且部分老顶矸石冒落高度达到0.6m。然后,通过在支架上布置自动检测压力表,研究了采动影响下的采场支架压力变化,并与老塘顶板跨冒、巷道围岩变形作对比分析,得到了初次放顶技术方案的可行性,为相类似条件的工作面初次放顶提供有益的技术参考。     

公用事业的多产品定价与政府规制:由上海观察

上海电力公司热电联供的热力价格调整案例表明,完全分配成本法可能会导致共同成本在热力与电力产品问的不合理分摊。而激励问题的存在将加剧共同成本的不合理分摊状况,最终结果是用户的福利受到损失。同时。政府的规制行为受到特定利益集团间的竞争驱动,并且规制者自身有着特定的利益目标,最终规制政策的出台实质上是利益集团间的博弈均衡。为此,寻求更为合理的多产品价格规制方法,以及如何保证利益集团博弈中的规制均衡成为一种社会合意的结果,成为多产品公用事业政府规制改革中的重要问题。     

基于LBPH算法的人脸识别算法研究与设计

人脸识别技术是一种根据人脸的特征信息进行身份判定的技术,此技术经过几十年的发展,由弱人工智能向强人工智能转化,论文提出了一种Python语言利用LBPH算法提取人脸特征、实现人脸识别的方法。     

Using paradata to collect better survey data: Evidence from a household survey in Tanzania

Data are a key component in the design, implementation, and evaluation of economic and social policies. Monitoring data quality is an essential part of any serious, large‐scale data collection process. The purpose of this article is to show how paradata should be used before, during, and after data collection to monitor and improve data quality. To do this we use timestamps, global positioning system (GPS) coordinates, and other paradata collected from an 800‐household survey conducted in Tanzania in 2016. We demonstrate how key paradata can be used during each phase of a research project to identify and prevent issues in the data and the methods used to collect it. Our results corroborate the importance of collecting and analyzing paradata to monitor fieldwork and ensuring data quality for micro data collection in developing countries. Based on these findings we also make recommendations as to how researchers can make better use of paradata in the future to manage and improve data quality. We argue for an expansion in the understanding and use of varied paradata among researchers, and a greater focus on its use for improving data quality.     

How does face influence the purchase of imitative new products? Moderating roles of product design characteristics

Face plays a profound role in consumption, but the question of how it impacts the purchase of imitative new products remains unanswered in the current literature. Imitative new products, which are legitimate innovations bearing similarities to existing products, are prevalent in many markets. This study investigates how two dimensions of face consciousness—the desire to gain face and the fear of losing face—influence consumers' purchase intentions regarding imitative new products by considering three product design characteristics (new product imitation locus, new product imitation scope, and product hedonism) as boundary conditions. We find through experiments carried out with adult Chinese consumers that the desire to gain face strengthens, but the fear of losing face weakens purchase intention. Moreover, the positive effects of the desire to gain face are weakened by imitation locus (form vs. function imitation) but enhanced by imitation scope (either form or function imitation vs. both form and function imitation); whereas the negative effects of the fear of losing face are strengthened by imitation locus but weakened by imitation scope. Product hedonism enhances the positive effects of the desire to gain face and augments the negative effects of the fear of losing face. This study thus contributes to the face literature by differentiating the roles of two dimensions of face consciousness in affecting consumption of imitative new products. In addition, this study contributes two important constructs—new product imitation locus and new product imitation scope—to the literature on imitative new products.     

浅谈语码转换的语用研究

自20世纪70年代以来,语码转换一直是语言学家普遍关注的问题。他们从心理语言学及语用学等不同的角度来研究语码转换。文中拟从语用学的角度对语码转换做深入的分析,研究此现象与面子理论及其与标记理论之间的关系,并分析语码转换的成因。     

同属顾客干预时不良顾客的反应模式研究

基于关键事件法和解释学的研究方法,以不良顾客自身的消费经历作为研究对象,阐述在有同属顾客干预的情景下不良顾客的反应模式以及背后的机制。通过对于115个有效关键事件的分析,得出了4种不良顾客受到同属顾客干预时的反应模式,包括立即终止、渐变衰弱、变本加厉和继续放纵四种类别;并归纳出有4种解释机制影响着不良顾客反应模式的变化———社会规范、成本与收益效应、社会支持和面子机制。这些机制分别受到不同因素的影响,企业管理者可以通过操控这些因素来服务于自己的管理实践。     

我国农产品出口面对的贸易障碍透析

乌拉圭回合《农业协议》生效后,我国农产品出口面对的贸易障碍一是属于非关税壁垒的技术壁垒;二是属于关税壁垒类的关税高峰和关税升级。技术壁垒在我国入世之前就已存在,只是加入WTO后,技术壁垒形势日趋严峻,已成为制约我国农产品出口的最大障碍。关税高峰和关税升级是《农业协议》生效后新形成的贸易障碍。无论是技术壁垒还是关税高峰和关税升级对我国农产品出口的冲击都超过了入世之前,冲击带来的影响不容低估     

采用Gabor-Hough变换的自适应滤波人眼定位

人眼定位是人脸识别方法的第一步。传统人眼定位方法需要将人脸裁切,情况单一,对于复杂背景、倾斜等情况,精度低,宽容度差。指出将改进的滤波器与改进的定位方法相结合,首先对原图像进行Gabor变换,寻找图像凹陷,凹陷区域通过边缘像素向量改进的Hough变换检测瞳孔,得到参考坐标,经过训练得到滤波器并在角度\[-0.1,0,0.1\]旋转两次得到3个相关滤波器,通过相关滤波器滤出3个目标,选择最小误差位置作为最终的目标。相比传统方法,改进方法避免了矩阵盲目计算,具备传统方法的普适性,学习过程使定位误差减小为0.040 4,计算量减少为传统方法的1/5。该方法对不同光照、光照不均、不同表情、复杂背景、头部倾斜等情况有较好的鲁棒性,避免了单一方法定位不到和不准的情况。     

高校体育如何应对21世纪的体育休闲时代

为了应对体育休闲时代的到来,高校体育应面向培养人才、科学研究、服务社会这三大社会职能转型.树立"每天锻炼1小时,健康工作50年,幸福生活一辈子"的健康生活理念.为此,应使高校体育目标向多元化、科学化方向发展;使高校休闲体育向课内外一体化、整体结构化方向发展;使高校休闲体育具有健康性、兴趣性与文化性的特点;使高校休闲体育管理向科学化、规范化、现代化发展.