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关键词： 煤矿   综采机电设备   设备管理   管理措施  

摘要： 综采机电设备的正常运行对于煤矿的安全高效开采具有十分重要的意义。为此,需要做好煤矿综采机电设备 的管理工作。通过阐述煤矿综采机电设备管理的重要性,分析了煤矿生产过程中综采机电设备管理的措施,可以为煤矿 井下机电设备的管理提供一定的参考。

关键词： 极地   寒冷   施工   技术  

摘要： 本文通过收集极地自然环境资料,研究寒冷环境下水工结构施工安全技术与设备管理,针对性地提出了临时设施、人员防寒、车辆防滑和现场作业注意事项、安全防范措施,以旋挖钻机和吊车施工作业为例,探讨了大型设备在极地施工的可能性。经过实践证明,这些措施是行之有效的。

关键词： 轧钢机械设备   管理与维护   存在的问题   解决对策   探讨分析  

摘要： 随着社会经济的飞速发展,现代化建设持续加快,在社会生产中各种类型的现代化设备正发挥着关键作用,企业要想增强自身实力,在日益加剧的市场竞争中占据优势地位,就得在提高现代化设备的工作效率方面多下功夫。轧钢的作用是让钢锭、钢坯等材料发生形变,这一过程需要借助轧辊的压延才能完成。现阶段在国内企业的管理工作当中,轧钢设备已成为不可忽略的重要部分。同时随着时代的不断进步,竞争力的不断加强,对轧钢设备的要求也越来越严格。因此,我国当前轧钢企业的机械化管理工作要将主要精力转移到轧钢机械设备的管理和维护上来。文章首先对轧钢机械设备管理与维护的意义及作用进行探究,其次根据管理和维护轧钢机械设备的现状提出一些建议,希望能为同业人员的日常工作起到帮助。

关键词： 高等学校  

ISBN: (纸本)9787548748311

摘要： 本书涵盖了大型仪器申购论证、采购、验收、共享管理、开放基金、开放补贴、共享管理、使用收费、仪器维修及维修基金、绩效考核、仪器损坏、丢失赔偿、闲置及处置等方面的内容。

关键词： 船用柴油机   设备管理   维修  

ISBN: (纸本)9787570618279

摘要： 本书共分为9章，主要以TBD234柴油机为例介绍了柴油机管理和维修的基本步骤和方法。是一本有关柴油机修理的专业读物。可以使学生基本掌握柴油机管理和维修的基本方法和技能。

摘要： The occurrence of regime shifts in marine ecosystems has important implications for environmental legislation that requires setting reference levels and targets of quantitative restoration outcomes. The Baltic Sea ecosystem has undergone large changes in the 20(th) century related to anthropogenic pressures and climate variability, which have caused ecosystem reorganization. Here, we compiled historical information and identified relationships in our dataset using multivariate statistics and modeling across 31 biotic and abiotic variables from 1925 to 2005 in the Central Baltic Sea. We identified a series of ecosystem regime shifts in the 1930s, 1970s, and at the end of the 1980s/beginning of the 1990s. In the long term, the Central Baltic Sea showed a regime shift from a benthic to pelagic-dominated state. Historically, benthic components played a significant role in trophic transfer, while in the more recent productive system pelagic-benthic coupling was weak and pelagic components dominated. Our analysis shows that for the entire time period, productivity, climate, and hydrography mainly affected the functioning of the food web, whereas fishing became important more recently. Eutrophication had far-reaching direct and indirect impacts from a long-term perspective and changed not only the trophic state of the system but also affected higher trophic levels. Our study also suggests a switch in regulatory drivers from salinity to oxygen. The "reference ecosystem" identified in our analysis may guide the establishment of an ecosystem state baseline and threshold values for ecosystem state indicators of the Central Baltic Sea.

关键词： 实时操作系统  

ISBN: (纸本)9787512436800

摘要： 本书讲述了SylixOS设备驱动程序编写过程中需要学习的操作系统内核的原理及其使用方法，包括：SylixOS设备驱动的并发与同步原理、SylixOS内存管理、Cache与MMU管理、SylixOS中断系统、SylixOS时钟管理和DMA系统等。

关键词： Active safety systems   Injuries   Cyclist   Naturalistic driving   Counterfactual simulations  

摘要： The total number of road crashes in Europe is decreasing, but the number of crashes involving cyclists is not decreasing at the same rate. When cars and bicycles share the same lane, cars typically need to overtake them, creating dangerous conflicts-especially on rural roads, where cars travel much faster than cyclists. In order to protect cyclists, advanced driver assistance systems (ADAS) are being developed and introduced to the market. One of them is a forward collision warning (FCW) system that helps prevent rear-end crashes by identifying and alerting drivers of threats ahead. The objective of this study is to assess the relative safety benefit of a behaviour-based (BB) FCW system that protects cyclists in a car-to-cyclist overtaking scenario. Virtual safety assessments were performed on crashes derived from naturalistic driving data. A series of driver response models was used to simulate different driver reactions to the warning. Crash frequency in conjunction with an injury risk model was used to estimate the risk of cyclist injury and fatality. The virtual safety assessment estimated that, compared to no FCW, the BB FCW could reduce cyclists' fatalities by 53-96% and serious injuries by 43-94%, depending on the driver response model. The shorter the driver's reaction time and the larger the driver's deceleration, the greater the benefits of the FCW. The BB FCW also proved to be more effective than a reference FCW based on the Euro NCAP standard test protocol. The findings of this study demonstrate the BB FCW's great potential to avoid crashes and reduce injuries in car-to-cyclist overtaking scenarios, even when the driver response model did not exceed a comfortable rate of deceleration. The results suggest that a driver behaviour model integrated into ADAS collision threat algorithms can provide substantial safety benefits.

关键词： 铁路工务   线路设备管路   安全生产  

摘要： 我国经济高质量发展阶段,铁路工程建设规模和范围都在促进中不断扩大.在开发和建设铁路运输路线时,运输任务内容及要求显著增加,再加上受到内外环境影响,其设备管理工作亦显得格外重要,直接影响到安全生产及正常运作.在近年来的实际管理工作中,工务线路设备管理虽然有所改善,但仍存在一些问题及不足.文中,笔者试图通过提出有目的性、有针对性的改进措施,以切实促进铁路安全运作、高效运输.

关键词： Kedo-S-Square rotary file   Hand K-files   Hand H-files   Primary teeth   Pulpectomy   Cone-beam computed tomography  

摘要： Background In recent years, pediatric endodontics has witnessed various advances including use of rotary files in pulpectomy. This study aimed to comparatively evaluate taper, amount of dentin removal and instrumentation time of the pediatric rotary Kedo-S Square file, hand K-files and H-files in primary canines using cone beam computed tomography (CBCT). Methods 60 primary canines were randomly assigned into three groups;A1 Kedo-S-Square rotary file (group I), hand stainless steel K file (group II) and hand stainless steel H file (group III). Teeth were mounted in vinyl poly siloxane impression material templates to be scanned before and after instrumentation by CBCT scans using Ondemand 3D software. Shaping ability of the files were evaluated in terms of taper of the canal and amount of dentin remaining of each group. Instrumentation time was recorded using a digital stopwatch. Results Kedo-S Square removed a significantly less amount of dentin in both apical (P < 0.002) and coronal thirds (P < 0.014). Taper of the preparations showed significant differences as Kedo-S Square file showed good taper in maximum number of root canals, while maual K- and H-files showed poor taper in maximum number of root canals (P < 0.0001). Rotary Kedo-S Square files required less instrumentation time (P < 0.0001). Conclusion The use of rotary Kedo-S Square files resulted in better conservation of tooth structure, superior tapering ability and least instrumentation time compared to hand K- and H-files.