Numerical simulation of rime ice accretion process on an airfoil

To simulate the ice accretion on an airfoil, a boundary moving technique is proposed to deal with the distortion of the airfoil surface due to ice accretion on the leading edge. Incorporating the two‐phase model of air‐supercooled droplets in the Eulerian coordinate system, this technique is applied to simulate the process of the rime ice accretion (the droplets freeze at the instant impinging on the airfoil) on the NACA 0012 airfoil, and the ice profile after ice accretion is achieved successfully. A brief comparison between the results of this paper and the experiment data indicates that the current method is applicable and effective. © 2005 Wiley Periodicals, Inc. Heat Trans Asian Res, 34(4): 226–234, 2005; Published online in Wiley InterScience ( www.interscience.wiley.com ). DOI 10.1002/htj.20064     

磷石膏料浆专用阀设计

介绍了磷石膏料浆的生产过程及其工况特性,给出了磷石膏料浆专用阀的技术参数、工作原理、结构特点和设计方法。     

水分迁移对岛状冻土区埋地管道周围非稳态温度场的影响

多年冻土岛大多处于连续多年冻土和季节性冻土的过渡地带,沼泽化现象很普遍,对土壤热交换条件极其敏感。结合岛状冻土区土质条件及环境因素,建立饱和冻土多孔介质水热耦合模型并进行数值计算,研究水分迁移、冰水相变对冻土温度场和埋地原油管道非稳态传热的影响。对控制和减少因管基融沉导致的安全事故,保障管道长期稳定运营具有现实指导意义。     

海洋平台桩腿防腐层修复三层包覆防护结构研究与应用

目的研究开发一种可在海水环境中施工的海洋平台桩腿飞溅区防腐层修复体系——三层包覆结构及其施工方法。方法通过材料研究及产品生产研究和性能评价及现场应用及检测,开发出满足防腐层修复的材料体系和施工方法。结果该三层包覆防护结构的自憎水密封油的憎水率达到98.4%,防腐带的拉伸强度达18.6 MPa,断裂伸长率达21.6%;防护套的拉伸强度达31.8 MPa,断裂伸长率达760%,抗紫外光时间达3000 h,三层包覆防护体系能够耐渤海湾百年一遇的冰冲击。结论研制的三层包覆防护材料能满足海洋环境的施工和防腐要求,同时满足海洋平台飞溅区桩腿防腐蚀和抗冰冲击的要求,是一种海洋平台桩腿及其他类似构筑物飞溅区腐蚀防护效果很好的修复技术。     

Antifreeze Proteins: Novel Applications and Navigation towards Their Clinical Application in Cryobanking

Antifreeze proteins (AFPs) or thermal hysteresis (TH) proteins are biomolecular gifts of nature to sustain life in extremely cold environments. This family of peptides, glycopeptides and proteins produced by diverse organisms including bacteria, yeast, insects and fish act by non-colligatively depressing the freezing temperature of the water below its melting point in a process termed thermal hysteresis which is then responsible for ice crystal equilibrium and inhibition of ice recrystallisation; the major cause of cell dehydration, membrane rupture and subsequent cryodamage. Scientists on the other hand have been exploring various substances as cryoprotectants. Some of the cryoprotectants in use include trehalose, dimethyl sulfoxide (DMSO), ethylene glycol (EG), sucrose, propylene glycol (PG) and glycerol but their extensive application is limited mostly by toxicity, thus fueling the quest for better cryoprotectants. Hence, extracting or synthesizing antifreeze protein and testing their cryoprotective activity has become a popular topic among researchers. Research concerning AFPs encompasses lots of effort ranging from understanding their sources and mechanism of action, extraction and purification/synthesis to structural elucidation with the aim of achieving better outcomes in cryopreservation. This review explores the potential clinical application of AFPs in the cryopreservation of different cells, tissues and organs. Here, we discuss novel approaches, identify research gaps and propose future research directions in the application of AFPs based on recent studies with the aim of achieving successful clinical and commercial use of AFPs in the future.     

某大厦空调方案的选择

简要介绍了冰蓄冷系统及VRV空调系统的工作原理及特点,根据工程特点和业主要求,推荐了两种空调方案,给出了其主要设备及系统组成,并对两种方案的初投资、运行费用、占地面积、使用寿命、维护管理等进行了比较。对该工程设计中的几个问题,如VRV室外机的布置,新风系统的设计等作了说明。最后,就两种空调系统的应用前景进行了展望。     

北京海淀新技术大厦冰蓄冷设计及其运行

本文介绍了某冰蓄冷空调工程的设计应用。根据其运行数据,分析比较了冰蓄冷空调与普通电制冷空调的运行费用及一次投资费用,论述了采用冰蓄冷空调的意义及其应用前景。     

曲阜师范大学生化楼风化墙体的鉴定加固

曲阜师范大学生化楼经多年使用,一层外墙墙体多处风化,部分出现竖缝;内墙部分主梁和门窗过梁下亦有裂缝.“冰裂作用”是造成外墙风化和砖、砂浆强度降低的主要因素.加固处理方案为：墙体做防水防潮处理,大跨度房间墙体附壁柱加固,梁下有八字形裂缝墙体双面钢筋网加固,对开裂的钢筋砖过梁采用加设角钢加固.     

冰浆生成技术研究进展及实验初探

冰浆蓄冷技术能有效地对电力“移峰填谷”及平衡电网负荷,是目前蓄冷和动态制冰领域的最新发展方向。冰浆制取方式是冰浆蓄冷技术研究的关键课题,研究目的在于实现冰浆作为通用的低温冷媒,获得高效的间接制冷方式。本文分析了冰浆生成技术的发展现状,并建立了基于过冷法的冰浆实验制取装置,其中过冷却器采取低温冷媒间接冷却方式,用电加热器处理冰堵问题。