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摘要： 随着城市化的进一步发展,地下空间的建设变得越来越重要.盾构施工作为地下空间建设的重要技术手段,其设备管理质量直接影响到施工的效率和质量.

关键词： 港口   机械设备   维护管理  

摘要： 近年来,随着全球经济一体化进程的不断加快,由此极大的推动了各个前沿领域的发展,港口机械设备维修管理水平的高低直接影响港口运营的顺利程度,已成为港口竞争的重要指标.如今,港口作业机械化已基本形成,港口机械设备管理对港口作业的质量具有显著影响.港口机械设备维护管理有利于顺利完成港口生产任务.现阶段,市场竞争日益激烈,港口企业过于关注机械应用,忽视了机械的养护管理,出现了诸多问题.为此,相关人员需采取有效措施加强设备养护管理,以推动企业的健康发展.

关键词： 设备   管理   维修保养技术  

摘要： 文章对于机械设备经常遇到的故障问题,针对机械设备的管理进行了分析,研究了设备维修保养技术.从完善维修保养制度体系、提高机械设备的润滑保养技术、提高设备的防腐保养技术、运用智能自动化技术4个方面入手,针对机械设备维修和保养技术的科学应用提出具有建设性的建议,并探讨了机械设备维修保养技术设计流程.

关键词： 放射医疗设备   管理   维修   价值   精密度  

摘要： 在医疗领域中，病患的诊疗有效率是医学中所关注的内容?而精准且有效的诊断与治疗工作的开展，除了要拥有专业性性较高的临床医师外，还会涉及到精密度高?具备良好性能的放射医疗设备，用来进一步观察患者的病症情况，从而获取更多有价值的数据信息，在临床诊疗中起着很重要的辅助作用，帮助医生快速对患者的病情作出诊断，并制定针对性的治疗方案，提高临床治疗的有效率?由此可见，放射医疗设备在医疗领域发展中占据着重要地位，各大医疗机构领导层应加强放射医疗设备的管理与维护，以便在第一时间发现设备中存在的故障问题，及时进行维修，以确保

关键词： artificial neural networks   entropy   geographic information systems (GIS)   infectious disease modelling   machine learning   multi-criteria decision analysis (MCDA)  

摘要： Modelling infectious diseases is a complex and multi-disciplinary problem that necessitates the combined use of multicriteria decision analysis (MCDA) and machine learning (ML) in a spatial framework. This research attempts to demonstrate the extensive applications of MCDA in the field of public health and to illustrate its utility with the combined use of spatial models and machine learning. The study investigates the risk factors for communicable diseases with a focus on vector-borne infectious diseases, such as West Nile Virus (WNV), malaria, dengue, etc. It aims to quantify vector-borne disease risk by examining the geographic contextual effects of socio-economic, climatic, and environmental factors using the objective-weighting technique adopted from MCDA and machine learning in a geographic information systems (GIS) framework. The authors attempted to minimize subjective bias from the decision space by utilizing an objective-weighted technique to quantify the risk. The study adopted Shannon's entropy to derive weights for each factor and its classes. The derived weighted layers are fed to an artificial neural network to obtain a final map of risk susceptibility. This final risk map allows policymakers to examine vulnerable areas and identify the factors pivotal to the contribution of risk. Findings show the traffic volume as the most influential variable, and terrain slope as the least one in the disease spread for the study area. The risk appears to be concentrated and distributed along vegetation, wetlands, and around water bodies. The results produced by ensemble learning show great promise with more than 94% accuracy. The accuracy of the results was determined by the confusion matrix and the kappa index of agreement (KIA). The vector control programmes need to adapt to better manage the dynamic changes in patterns involving vector-borne infectious diseases.

关键词： Sertoli cell   Spermatogenesis   Leydig cell   Testis   Androgen  

摘要： Sertoli cells are the orchestrators of spermatogenesis;they support fetal germ cell commitment to the male pathway and are essential for germ cell development, from maintenance of the spermatogonial stem cell niche and spermatogonial populations, through meiosis and spermiogeneis and to the final release of mature spermatids during spermiation. However, Sertoli cells are also emerging as key regulators of other testis somatic cells, including supporting peritubular myoid cell development in the pre-pubertal testis and supporting the function of the testicular vasculature and in contributing to testicular immune privilege. Sertoli cells also have a major role in regulating androgen production within the testis, by specifying interstitial cells to a steroidogenic fate, contributing to androgen production in the fetal testis, and supporting fetal and adult Leydig cell development and function. Here, we provide an overview of the specific roles for Sertoli cells in the testis and highlight how these cells are key drivers of testicular sperm output, and of adult testis size and optimal function of other testicular somatic cells, including the steroidogenic Leydig cells.

关键词： 分布式操作系统  

ISBN: (纸本)9787121423611

摘要： 本书通过理论篇、实践篇、工程篇、总结篇 (总计13章) , 介绍了分布式系统的知识体系。理论篇介绍了一致性、共识、分布式约束等知识 ; 实践篇介绍了分布式锁、分布式事务、服务发现与调用、服务保护与网关、幂等接口等知识 ; 工程篇介绍了消息系统中间件RabbitMQ和分布式协调中间件ZooKeeper等知识 ; 总结篇则帮助大家厘清分布式系统的知识脉络。

关键词： Low-power   High-speed   Rail-to-rail   Slew rate   Settling time   Current feedback   Compensation resistor   Stability   Output buffer   Source driver   OLED display  

摘要： In this work, we propose a rail-to-rail output buffer with low static-power and high speed for OLED display applications. To guarantee low static power consumption, low tail-current is designed in the buffer's first stage and the output stage is cut off in the static operation. To improve the transient response, dynamic-current-bias technique is used, and it also improves the system stability by pushing away the non-dominant pole. Meanwhile, we balance the large-signal slew-rate and system stability with dual-output buffer structure. Placing compensation resistor across the dual outputs creates zero for suitable phase margin, while the real output still behaves with low ON resistance and keeps high slew rate. The proposed design has been verified by a 0.18 mu m 1.8 V/5 V CMOS process, which shows that the buffer only draws 2.8-mu A static current. Under a 1-nF capacitance load and a 5-V power supply, the buffer achieves 1.18-mu s settling time, which is only 41% of the single-output-stage structure with the same chip size (52 mu m x59 mu m).

关键词： 数据管理  

ISBN: (纸本)9787121424786

摘要： 本书介绍了文件系统的概念、原理和具体实现。涵盖本地文件系统、网络文件系统、分布式文件系统和对象存储等内容，可以说涵盖了数据持久化文件系统的主要领域。

关键词： JAVA语言  

ISBN: (纸本)9787111694496

摘要： 本书分为为什么要用分布式、协议、扩展、可观测性、容器、部署、容器编排、弹性、分布式基元和安全性10章，包含JavaScript的单线程特性、使用HTTP请求和响应、使用GraphQL构建API外观、使用HAProxy实现反向代理、使用Docker Compose进行基本编排等内容。