分光计与读数显微镜的保养和维护

分光计与读数显微镜是常用的光学仪器,使用频率高。为了保正光学实验仪器的正常使用,同时延长仪器的寿命,总结了两种光学仪器保养与维护的有效方法。     

The global significance of biodiversity science in China: an overview

Biodiversity science in China has seen rapid growth over recent decades, ranging from baseline biodiversity studies to understanding the processes behind evolution across dynamic regions such as the Qinghai-Tibetan Plateau. We review research, including species catalogues; biodiversity monitoring; the origins, distributions, maintenance and threats to biodiversity; biodiversity-related ecosystem function and services; and species and ecosystems’ responses to global change. Next, we identify priority topics and offer suggestions and priorities for future biodiversity research in China. These priorities include (i) the ecology and biogeography of the Qinghai-Tibetan Plateau and surrounding mountains, and that of subtropical and tropical forests across China; (ii) marine and inland aquatic biodiversity; and (iii) effective conservation and management to identify and maintain synergies between biodiversity and socio-economic development to fulfil China''s vision for becoming an ecological civilization. In addition, we propose three future strategies: (i) translate advanced biodiversity science into practice for biodiversity conservation; (ii) strengthen capacity building and application of advanced technologies, including high-throughput sequencing, genomics and remote sensing; and (iii) strengthen and expand international collaborations. Based on the recent rapid progress of biodiversity research, China is well positioned to become a global leader in biodiversity research in the near future.     

Data analysis and feature selection for predictive maintenance: A case-study in the metallurgic industry

Proactive Maintenance practices are becoming more standard in industrial environments, with a direct and profound impact on the competitivity within the sector. These practices demand the continuous monitorization of industrial equipment, which generates extensive amounts of data. This information can be processed into useful knowledge with the use of machine learning algorithms. However, before the algorithms can effectively be applied, the data must go through an exploratory phase: assessing the meaning of the features and to which degree they are redundant. In this paper, we present the findings of the analysis conducted on a real-world dataset from a metallurgic company. A number of data analysis and feature selection methods are employed, uncovering several relationships, which are systematized in a rule-based model, and reducing the feature space from an initial 47-feature dataset to a 32-feature dataset.     

具有生态意识的二维视情维修决策

为了避免预防性维修的决策判断过于片面,本文首先将系统劣化状态和能源效率指标相结合,建立了具有生态意识的二维视情维修决策模型,即当系统的劣化状态超过其阈值或者能源效率指标超过其阈值时（两者发生其一即可）,对系统进行预防性维修;然后将系统运行过程中的能源消耗成本纳入总成本中,并以单位有用产出的平均期望成本为目标函数建立优化模型;最后利用蒙特卡洛仿真和模拟退火算法进行算例分析。结果表明：与传统的只基于劣化状态或者能源效率指标的一维视情维修决策模型相比,本文新提出的二维视情维修决策模型更优,不仅可以降低企业维修成本,而且可以节约能源,满足可持续发展的时代要求。     

Relational maintenance and caregiving in the grandparent-grandchild relationship

ABSTRACT

The purpose of this study was to examine the relationships between grandparents’ use of relational maintenance behaviors (RMB) and their young adult grandchildren’s willingness to serve as future caregivers for their grandparents. Undergraduate students (N = 209) completed a questionnaire in which they reported on a specific grandparent’s use of RMB and how willing they were to serve as future caregivers for that specific grandparent. Results of a multiple regression analysis provided partial support for the hypothesized positive relationships between grandparents’ use of RMB and grandchildren’s willingness to serve as future caregivers for their grandparents.     

1994—2007年CBMdisc收录MRI维护维修文献的计量分析

利用“中国生物医学文献数据库”（CBMdisc）,对1994—2007年5月国内MRI维护维修相关中文文献进行文献计量学分析,对今后国内MRI维护维修工作具有重要指导意义。     

基于Windows NT网络的架构模型

局域网络是将小区域内的各种通信设备互连在一起的通信网络，基于Windows NT域的模式可以有三种构架方案：单域模式、单主域模式、多主域模式。     

基于外部数据源建立日文书目数据库的若干问题

论文通过比较分析建立日文书目数据库可利用的几种外部数据源,确认了CALLS联机目录日文书目数据库为最佳的外部数据源,并探讨了利用CALLS书目数据进行日文书目数据库建设应注意的若干问题。     

浅谈教学机房系统、数据的安装与保护

文章针对机房使用中容易出现的软件环境破坏现象谈了系统的保护和恢复，以及如何实现软件的自动安装，从而减轻管理人员的工作强度。     

明清苏浙农村经济与徽商的活动

明清两代,苏浙农村经济存在“口粮缺乏”和“家庭副业的维持”两大问题。本文拟从分析问题产生的原因出发,探讨徽商在问题解决中的活动与作用,并对其作用作出客观评价。