模块化冷电联产机组在移动式数据中心的应用

移动式数据中心对供电、供冷的容量和可靠性有较高要求。简要介绍了模块化冷电联产机组在移动数据中心的应用,并结合实际案例,提出了配置时所需注意的问题和相关建议。     

数据中心的设备与环境监控——数据中心机房综合监控系统解决方案

本文针对数据中心机房设备密集、维护人员多、管理与监控困难的特点，以确保数据中心机房实现集中管理、统一监控和快速反应，降低机房监控维护成本，提高运行维护质量等为目标，介绍了一套数据中心机房综合监控系统整体解决方案。     

松耦合数据中心体系架构研究综述

数据中心作为信息产业的基础近年来得到了飞速的发展,同时也面临着大数据时代带来的新挑战。传统数据中心架构与数据中心新兴应用特性的不匹配越发明显,同时数据中心的资源利用率也持续偏低,然而数据中心的成本和功耗却在不断走高。面对这些问题,松耦合数据中心架构的发展成为数据中心重要的发展趋势。将数据中心资源松耦合化,可以突破传统物理界限,在提高资源利用率的同时加强成本控制。本文首先总结了松耦合数据中心发展现状,然后提炼了松耦合数据中心架构的关键技术,最后对该领域未来的发展前景进行了展望。     

基于JUNOS操作系统的交换机集群技术

交换机集群技术主要应用在数据中心里面,通过这种技术可以有效的简化数据中心的网络架构,因为集群后的交换机即作为一台逻辑上的模块化交换机,提供统一的配置、管理、维护、升级等功能,完全等同于一台独立的机箱式交换机。通过交换机集群技术,可以大大节省在汇聚层交换机和接入层交换机之间布线的成本和管理的成本,还可以大大节省汇聚层交换机上面对端口密度的要求。这种技术可以大大地降低数据中心的复杂性,在管理维护上,也会帮助客户节省更多的成本。     

通过提高制冷效率减少数据中心能耗的五项策略

1执行概要随着电价和IT能耗持续上升,IT相关能源成本受关注的程度日益提高。设计规范的数据中心的制冷耗电量约占其总耗电量的37％,在许多情况下。这是降低IT能源成本的大好机会。提高数据中心制冷效率可以有效地降低数据中心制冷能耗,具体的策略有以下五项：     

浅谈计算机机房的建设与日常管理维护

机房管理具有涉及面广、实践操作性强、事务杂、工作量大等特点。从广义上来说,硬件设备的配置、维护和故障检修、机房内部网络和系统的建设、软件的安装、配置和更新、病毒和木马程序的防治、用电及制冷的安全保障、机房环境甚至地板沉重以及顶棚防水等都属于机房管理的内容。数据中心是利用先进的网络技术和存储技术,为客户业务体系的健康运转提供服务和运行平台,机房作为数据中心的基础平台,搞好计算机机房的建设与管理十分关键,本文主要介绍了计算机机房建设与维护的相关内容。     

浅析面向未来的云计算技术

所谓云计算是指以因特网为基础的新型计算模型,它以传统的网格计算、并行计算、分布式计算以及虚拟化和负载均衡等网络技术为基础做进一步发展。其具备极强的计算能力,可以将由个人计算机或者数据中心执行的任务向网络转移,从而实现计算机软件、硬件配置、安装和维护服务的共享,不仅大大降低了客户端的资源和成本投入,而且提高了工作效率。本文中,首先大概介绍了云计算技术的发展背景,然后提出了在云计算技术中广泛应用的关键技术以及在现代生活中的应用。     

监控系统助力数据中心提高可用性与管理效率——访《数据中心监控系统技术白皮书》主要起草人、深圳共济科技有限公司总工程师易南昌

众所周知,提高现代数据中心可用性与降低运营管理成本是数据中心管理永恒的主题。数据中心监控系统能够帮助管理者增强数据中心可用性、提高运维效率并降低运维成本,是现代数据中心必不可少的监控管理信息化工具,并在数据中心运行、维护、管理中,发挥着越来越重要的作用。     

应用于数据中心的氟泵自然冷却机组的模拟计算

数据中心的能耗主要来自IT配置、空调体系、电源配置和照明这四个方面。IT设备是数据中心的主要工作设备,其他三个是辅助设备,其中空调系统的能耗占到整个数据中心能耗的近40%。本文主要研究设计一套氟泵自然冷却空调模块,对氟泵系统的模型进行模拟计算,研究得出在数据中心冷却应用氟泵自然冷却机组节能效果明显。     

某数据中心空调系统设计分析

介绍了大规模数据中心的空调系统特点及设计思路,概述了数据中心空调系统的气流组织、设备配置、节能措施;论述了高密度机房空调系统的冷却方式,以及绿色数据中心的概念,并采用CFD模拟论证了设计的实际效果。     

The Research of Anti-Wear Properties of Organomolybdenum Compounds in the Engine Oils

A four-ball tester was used to evaluate the anti-wear performance of three kinds of organomolybdemun compounds in the engine oils, i. e., molybdenum dialkyldithiophosphate (MoDDP), molybdenum dialkyldithiocarbamate ( MoDTC), and sulphur and phosphorus freeorganomolybdeum (Molybdate). The results indicate that a low concentration of MoDDP doesn' t improve the anti-wear properties of the commercial engine oils, but a high concentration of MoDDP can obviously improve the anti-wear properties and the load-carrying capacity of the engine oils. MoDTC doesn' t improve the antiwear properties of the engine oils, but worsens the anti-wear properties of the oils. Signifi can timprove ment of frictional and wear characteristics is obtained with Molybdate added in the commercial engine oils and the formulated oils.     

Certification Becomes Important for the I Quality; and Safety Supervision of the Chinese Liquor Sector

The end of 2007, over 200 unit products of more than 80 Chinese firms have passed the quality grade certification for liquor products. These products involve distilled spirits, beer, wine, yellow wine, fruit syrup wine and others, and cover over 80% of the national top-branded liquor products.……     

Deposition and Coating Properties on CVD Tungsten

Surface characterization and microstructure studies are performed on chemical vapor deposited (CVD) tungsten coating. There is about 2 μm thickness diffusion layer of tungsten in the molybdenum substrate. The thermal shock test shows tungsten coating has good adhesion with molybdenum substrate, but the elements of oxygen and carbon in the tungsten coating have the bad affection to the adhesion. The result of high-temperature diffusion experiment is the diffusion rate from molybdenum substrate to tungsten coating is faster.     

Analysis of marine hydrobiont lipid extracts as possible cryoprotective agents

We studied a combined effect of the cryoprotectants both of lipid and carbohydrate origin at the presence of DMSO or without it on cell viability and the RNA synthesis in the embryonic mollusc and echinoderm cell cultures obtained at different developmental stages. Cryoprotective properties of exogenous lipids correlated with their thermotropic behavior. Lipid extracts from marine hydrobiontes, which thermal transitions are characterized by relatively small part of calorimetric thermogram area lying at temperatures above 0 °C (6–18%), were found to possess a considerable cryoprotective activity. The results are discussed in relation to the prediction of the cryoprotective activity of lipid extracts for marine animal cells. In addition, it was found that marine invertebrate cells can be cryopreserved without DMSO at the presence of trehalose and lipid extracts of some marine hydrobiontes.     

Low-Temperature Properties of Silver

Pure silver is used extensively in the preparation of high-temperature superconductor wires, tapes, films, and other configurations in which the silver not only shields the superconducting material from the surrounding materials, but also provides a degree of flexibility and strain relief, as well as stabilization and low-resistance electrical contact. Silver is relatively expensive, but at this stage of superconductor development, its unique combination of properties seems to offer the only reasonable means of achieving usable lengths of conductor. In this role, the low-temperature physical (electrical, thermal, magnetic, optical) and mechanical properties of the silver all become important. Here we present a collection of properties data extracted from the cryogenic literature and, to the extent possible, selected for reliability.     

Early ironwork in Biscay: Survey,excavation, experimentation and materials characterization. An integral study of the mountainside ironworks (ferrerías de monte or “haizeolak”)

ABSTRACT

The production of iron in Biscay (Basque Country, Spain) has been a hallmark of this territory of the North of the Iberian Peninsula throughout its history. The Archaeology team of the Basque Country Mining Museum has spent 13 years, so far, studying the origins of this activity through the evidences left at the old pre-hydraulic iron production workshops known as mountainside ironworks (ferrerías de monte) or haizeolak. It has catalogued 170 archaeometallurgical sites of this type in Biscay, and the archeological excavation of some of them has led to the knowledge of the different stages of the production process that took place in these workshops. The team has also experimentally reproduced the work carried out in a mountainside ironworks from the High Middle Ages, and it has currently started the characterization process of this type of activity through the study of the collected materials.     

Mechanism Study on the Wear of CrAlTiN Coated High-Speed Steel Twist Drills Under Dry Cutting Conditions

As demands about environment protection are growing up, dry cutting technology is getting more and more concerns from all over the world. Main works performed here are study on dry cutting performances and wear mechanisms of M2high-speed steel (HSS) twist drills with CrAlTiN multicomponent coatings, which was deposited using magnetron sputter ion plating system, in drilling 45 and 30CrMnSiA steel, and their comparisons to those in drilling the same steel but using monolayer CrN and commercial TiN coated drills. Drilling performances of drills are evaluated mainly through the measurements of width on outer corner flank land and the cutting forces. Results show that performances of CrAlTiN coated drills are better than those of monolayer CrN and TiN coated drills. In drilling 45 and 30CrMnSiA steel, the average tool life of the CrAlTiN coated drills are 17.2 and 11.8 times higher than those of the uncoated drills. Observing wear of the drill with scanning electronic microscope, results show that there is no crack or spallation of the CrAlTiN coatings in wear zones. Main mechanism of the wear here is adhesion.     

Study on Bond Ability of Arc-Spraying Coatings with Different Surface Pretreatment on Cast-Iron

Arc spraying coatings are widely used in various applications, but uncommon in cast iron substrate. Different surface pretreatment technology is tested on substrates of gray cast iron. Surface roughness and residual stress were measured by TR200 and X-ray diffraction analyzer. Influence of different surface pretreatment methods ( dry blasting and fusebond) on roughness and residual stress was analyzed. The arc-sprayed coatings of wire 3Cr13 (φ2mm) on gray cast iron substrate is studied. The microstructure and interface of bonding layer were observed by SEM. The bond strength was taken by tensile test. Results show that bond strength with grit blasting is higher than fuse-bond; it is feasible to make wire 3Cr13 coating with arc spraying on cast iron substrate roughened by grit blasting.     

Structural Characteristics of TiO2 Ceramic Coating by Micro-Plasma Oxidation

TiO2 ceramic coatings with thickness of 20 μm were formed on the surface of pure titanium by micro-plasma oxidation. Their micro-structures were investigated by by using X-ray diffraction and their surface images were detected by using scan electronic microscope. There were three kinds of TiO2 coatings, pure anatase type TiO2 phase, mixed phases consisted of rutile type TiO2 phase and anatase type TiO2 phase, pure rutile type TiO2 phase. The coating surface with the pure anatase type TiO2 phase is rough, while the coating surface with the pure rutile type TiO2phase is smooth. The upper coating surface with the mixed type TiO2 phases is anatase type TiO2 structure and the subsurface of the TiO2 coating is rutile type TiO2structure.     

Evaluation of fatigue life of steel using steel grain size

The insightful discussion of the relationship between the construction of metallographic and fatigue life and proposition of mathematical relationships describing this relationship was conducted in the paper. This paper presents a method for estimating the fatigue life, based on the construction of the microstructural material taking into account the grain size and the participation of ferrite and pearlite phase.