椅子放稳问题另解

关于椅子能否在地面上放稳的问题,以前建模的方法是用椅子脚与地面的距离来度量椅脚是否着地。这里采取另一种方法来证明椅子稍作挪动就可以使四只脚同时着地,即用椅腿与相应对角线的夹角来度量椅腿是否着地。     

祁南煤矿349机巷掘进时瓦斯涌出规律研究

通过对祁南煤矿349机巷瓦斯涌出和煤壁瓦斯涌出强度的测定,分析了祁南矿3号煤层巷道掘进时瓦斯涌出规律,对于指导矿井的通风设计和采掘部署,采取有针对性的防治煤巷掘进瓦斯灾害措施,具有重要的理论意义和实用价值。     

新型抱索器在斜巷架空人车上的应用

针对以往斜巷架空人车在维修、材料消耗、舒适性和安全性方面存在的问题,经过反复试验、比较和改进,现场采用近似于地面旅游索道原理的新型固定式抱索器取代了原先使用的抱索钢套。通过对淮北矿业集团桃园煤矿北二采区人行上山架空人车改造实践,阐述了新型固定式抱索器的结构、工作原理、安装方法和使用注意事项。     

Cruising through the stacks: Developing tools to rapidly and economically mass-produce stack end signage: A case study

The purpose of this article is to describe a case study that addresses issues related to stack end signage in a university library. Poor stack end signage can negatively influence patrons' ability to navigate the library and locate physical materials. At the Monsignor William Barry Memorial Library, a tool was developed using Microsoft Excel and Microsoft Word to quickly and inexpensively mass-produce effective and user-friendly stack end signage. This article details the specific steps taken to develop, implement, and utilize this instrument.     

Microsoft Excel在井巷工程预算中的应用

针对矿建工程预算编制过程中,手工编制速度慢、出错率高、不易修改、工作效率低等不利因素,运用Microsoft Excel编制矿建工程预算,能自动完成所需的计算和数据结果传递,快速、准确完成矿建工程预算编制工作,具有易修改、工作效率高等特点.     

钢-混凝土组合结构的抗火性能研究进展

对钢-混凝土组合结构的抗火性能研究进展进行了回顾,总结了钢管混凝土柱、钢-混凝土组合楼盖体系、梁柱节点和整体结构抗火性能的最新研究成果,并对组合结构的抗火研究趋势进行了展望。     

浅埋深煤层过采空区巷道锚固支护方法

在对惠阳煤业井底车场、集中辅助巷和集中胶带巷等巷道采空区进行实测,以及对采空区顶底板岩性实验分析的基础上,针对该采空区浅埋深的特点,提出了浅埋深煤层小导管临时支护和钢筋混凝土永久支护相结合的过采空区巷道锚固支护设计方法,并对其支护工艺和机理进行了描述,为过采空区巷道提供了一种新的锚固支护方法。     

Active Learning of the Floor of Mouth Anatomy with Ultrasound

More emphasis is now being placed on active learning in medical education. Ultrasound is an active learning tool that can be used to supplement didactic instruction. This study describes a self-guided activity for learning floor of mouth ultrasound. Thirty-three first year medical students learned floor of mouth scan technique and ultrasound anatomy through a brief PowerPoint module. They subsequently performed the scan on a standardized patient. Each student was asked to label the floor of mouth muscles on the image he or she acquired. After the activity, the students were given a quiz on anatomic relationships of the floor of mouth. Perceptions about the activity were collected through a survey. All 33 students obtained a floor of mouth image within a three minute time limit. Twenty-four (73%) students were able to completely and accurately label the image in time. The mean score on the muscle relationships quiz was 93%. Overall perceptions were very positive with most students expressing a “high” or “very high” level of interest in incorporating similar self-guided activities within the curriculum. This study showed that it is feasible for students to learn scan technique and recognize relevant ultrasound anatomy in an independent fashion through a brief active learning module. Furthermore, the students found the activity enjoyable. The implication is that similar activities could be developed which would provide additional ways to incorporate active learning strategies.     

Workers united: Digitally enhancing social connectedness on the shop floor

Organizations increasingly implement processes-oriented setups like value stream production. Whereas this transition may bring many advantages on an organizational level, related studies show that shop floor workers feel less able to maintain close contact with others and exchange awareness cues. Their diminished social connectedness has consequences on the personal (e.g., reduced satisfaction) and organizational (reduced efficiency) level. The current wave of digitization brings ample opportunities for companies to bring their employees closer together again. In order to identify such opportunities, we have studied the shop floor production practices of an automotive OEM (original equipment manufacturer) for nearly two years. Following a scenario-based action design science approach, we have developed problem and activity scenarios as well as a prototype that helps the workers to improve their social connectedness in three different scenarios. Eight weeks of use demonstrated the prototype’s positive impact on the employees’ social connectedness by allowing for social appraisal and by improving their sense of sharing and involvement. Our results show which information technology (IT) design elements can contribute to social connectedness on the shop floor.     

钢筋混凝土楼盖结构分析

在传统的梁板楼盖结构的基础上,从改进梁的结构形式和改进板的结构形式两个方面出发,介绍了目前现有的各种钢筋混凝土楼盖结构形式,展望了钢筋混凝土楼盖结构今后的发展方向。