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关键词： 煤矿开采   机电设备   设备维修   设备管理  

摘要： 煤矿生产中需要用到大量机电设备,做好煤矿机电设备的维修和管理对于煤矿生产的安全高效开展十分重要。简要分析了煤矿机电设备维修的要点,探讨了煤矿机电设备管理措施,以期为日后煤矿机电设备的维修与管理提供一些参考。

关键词： 分布式系统   关系数据库   NewSQL数据库   分布式一致性  

摘要： 随着互联网、云计算和数据采集等技术的不断研发,分布式系统逐渐成为信息化主流方向。数据库作为信息系统的核心技术,承担着海量数据的有效组织与存储责任。首先分析了分布式系统对数据库技术的数据一致性和安全性等需求,介绍了NewSQL数据库在数据共享、资源共享以及安全保障等方面的优势,剖析了基于分布式系统设计的NewSQL数据库关键技术,例如,分布式存储引擎、实时分析和查询引擎、HTAP混合负载架构以及分布式事务等,以期为未来大数据存储发展方向提供思路。

关键词： 分布式系统   Ceph   数据放置   负载均衡   异构性  

摘要： 本文首先探讨了Ceph架构与读写流程,包括节点计算能力与网络宽带在内的异构性,研究分布式计算框架Map Reduce,对Ceph架构进行改进,分析异构集群环境下确定初始数据的分配,选制定优化后的数据放置对策。

关键词： 污水处理厂   设备选型   管理策略  

摘要： 经济高速发展背景下,环境保护愈发重要。良好的生态文明,是我国经济持续健康稳定高质量发展的根本保证。污水处理厂作为污水处理的主阵地,是生态文明建设的核心领域。随着科学技术的高速发展,各种新工艺、新设备应用到污水处理过程中,不断提升污水处理的效率及质量,是污水处理厂安全高效运行的关键因素。本文就污水处理厂设备选型和设备管理展开分析。

关键词： Chlorophyll-a   Water column stratification   Euphotic depth   Nitrate   Frontal system   Hake fishery   SEA-SURFACE TEMPERATURE   HAKE MERLUCCIUS-HUBBSI   NORTHERN PATAGONIA   SOUTH-AMERICA   JORGE GULF   CHLOROPHYLL   DYNAMICS   FRONTS   PATTERNS   FEATURES  

摘要： Annual cycles of phytoplankton biomass (using chlorophyll-a as a proxy) and seasonal patterns of environmental drivers were analyzed in a semi-enclosed coastal ecosystem (San Matfas Gulf, SMG, Patagonian Continental Shelf, Argentina). Monthly climatologies (2003-2014) of satellite images of chlorophyll-a (Chla-sat), sea surface temperature (SST), photosynthetically available radiation (PAR), and euphotic depth (Z(1%)) were analyzed using Principal Component Analysis (PCA). Satellite environmental variables were evaluated together with oceanographic field data (temperature, nitrate, and chlorophyll-a). Thus, this study analyzes the Chla-sat data to describe the spatio-temporal distribution of the phytoplankton biomass in the SMG and investigates its relationship with the regional environmental drivers. Two contrasting phytoplankton annual cycles characteristic of these temperate waters were distinguished. PCA discriminated the inner and outer areas separated by a complex frontal system. The gulfs inner waters showed a bimodal phytoplankton cycle (maximums in autumn and spring) associated with the seasonal stratification of the water column in deeper areas and the consequent nitrate limitation in summer. The outer waters adjacent to the continental shelf showed unimodal cycles (maximum in autumn or spring) linked to the vertical mixing of the water column in shallow areas with moderate light intensity and nitrate availability. For both annual phytoplankton cycles, light is the main limiting factor in winter. Finally, the analyzed environmental patterns suggest that a tidal front favor feeding and spawning fishery resources in the north of the gulf.

关键词： WEEE   Waste management   Sustainability   Selective collection   Cooperative   WEEE MANAGEMENT   DEVELOPING-COUNTRIES   INFORMAL SECTOR   GENERATION   COLLECTION   BUSINESS   SYSTEMS   CHINA   MODEL   CHAIN  

摘要： An opportunity to reduce the costs of waste electrical and electronic equipment (WEEE) collection operation is to include WEEE in the already existing selective collection flows (inflows that present idleness). In this context, this paper aims to ascertain whether it is attractive for recycling cooperatives in a determined Brazilian municipality to include a selective collection of WEEE in their operating systems. This research uses a method structured in eight steps, involving WEEE generation, waste treatment, transport and distribution processes, besides the economic analysis steps. We conclude that WEEE inclusion is economically attractive when recycling cooperative receives support from scrap dealers and the government. Two points can be highlighted as barriers to the referred cooperatives operation: the distance between cooperatives and the recycling industry is generally long; and large generators and recycling industries do not establish agreements directly with cooperatives (because these cooperatives do not offer large volumes). This study shows that recycling factories are far from the municipality and estimates that the amount of recyclable materials collected by each cooperative is low. Thus, we suggest as public policies to establish incentives for recycling factories to settle in the municipality and to encourage the formation of cooperative associations. These cooperatives can jointly sell recyclable materials to become medium-sized suppliers. This study also estimates the amount of WEEE generated in the municipality. This estimate was important for the study because there is a lack of studies that estimate WEEE generation at the municipal level mainly in developing countries.

关键词： AGENCY   ADULTHOOD   VIOLENCE   POVERTY  

摘要： Purpose: The child marriage field lacks a simplified framework that connects an understanding of the drivers of child marriage for girls to decisions about the design of interventions to delay marriage within different contexts and support married girls. Methods: We reviewed existing child marriage frameworks and conducted consultations with experts working on child marriage. We then developed a simplified conceptual framework describing the key drivers of child marriage for girls. We explored how these drivers play out and interact using qualitative data from three settings where child marriage is common: Bangladesh, Malawi, and Niger. Results: The final conceptual framework lays out five core drivers of child marriage for girls, which vary and interact across contexts. Social norms and poverty are shown as core drivers that underlie lack of agency, lack of opportunity, and pregnancy/fear of pregnancy. These drivers reflect community, household, and individuallevel factors. The case studies highlight the important relationships between these drivers, and the way they interact within each context. We use these examples to explore how policymakers and practitioners might identify the most appropriate interventions to address child marriage across different settings. Conclusions: We offer this framework as a starting point to guide more targeted interventions and policies that address the complex combination of child marriage drivers within each setting. By adapting this framework to different settings, those designing and implementing child marriage prevention interventions can identify the key drivers in each setting, understand how those drivers interact, and more effectively target effective interventions. (C) 2021 Published by Elsevier Inc. on behalf of Society for Adolescent Health and Medicine.

关键词： 设备管理   专业素能   强化   具现   高效管理  

摘要： 烟草行业商业企业物流中心设备管理员,主要承担入库、分拣打码、包装设备的运行维护与保养;设备分级分类评估;设备一机一档档案管理;设备备件验收、领用、登记、发放;年度维保计划的编制与实施等工作,是保障分拣任务顺利完成的重要力量.设备管理员工作的好坏将直接关系到分拣效率与质量,对企业的正常运行与持续发展起到越来越重要的作用.

关键词： 混凝土搅拌站   设备管理   维修技巧和常识  

摘要： 本文主要讲述了三个内容,第一个主要内容是混凝土搅拌站设备的构成及其工作原理.第二个主要内容是混凝土搅拌站各部件常见故障、原因和主要排除方法.第三个主要内容是几种常用的混凝土设备维修和改造小技巧.