变频空调压缩机用三相变频电机的设计

本文综合考虑了变频器供电的特点和空调压缩机对电机的要求,对变频空调用调速电机的设计中的有关问题进行了探讨,并在此基础上设计了一台22kW的样机,试验表明该方案性能优良。     

高压处理对木瓜蛋白酶活性的影响及分子动力学模拟

为研究超高压处理对木瓜蛋白酶活性的影响及分子机制,将木瓜蛋白酶溶液经0.1、200和600 MPa处理,测定其活性变化,并对木瓜蛋白酶在这3种压力下进行150 ns的分子模拟,分析RMSD（均方根误差）、RMSF（均方根涨落）、回旋半径、氢键、溶剂可及表面积、体积、二级结构和分子表面结构等的变化。结果显示,200 MPa对木瓜蛋白酶起到激活作用,而600 MPa条件下酶活性降低26.2%。分子模拟表明高压处理能减小酶蛋白结构的波动;减少蛋白体积,使蛋白结构更加致密;蛋白溶剂可及表面积降低,特别是疏水表面积;高压能破坏酶蛋白间的氢键,使蛋白中β-折叠增加,而α-螺旋则是在600 MPa明显减少。200 MPa下酶的激活可能与该压力下酶活性中心的结合口袋变大因而更易与目标蛋白质结合有关;而600 MPa下酶活性的部分抑制则与该压力下酶结构遭受较大破坏有关,如α-螺旋和氢键的破坏、疏水表面积和蛋白体积的减小。从分子机制上明确了高压下木瓜蛋白酶活性变化的机理。     

乏燃料剪切机气固两相流分析及结构优化

后处理厂普遍采用机械法的剪切机系统进行乏燃料破解，剪切产生的放射性粉尘需进行包容设计，确保乏燃料芯块的充分利用和热室的可维修性，研究乏燃料剪切机内气流形态和颗粒物分布运动规律对于保障剪切机的正常运行具有重要意义。为补充试验研究和理论研究的不足，改善剪切机内粉尘分布、降低粉尘水平和优化剪切机设计，本文以注入模拟颗粒的乏燃料剪切机为研究对象、离散颗粒模型为基础，对剪切机内气固两相流进行了计算流体力学模拟。通过分析剪切机内流体的速度、压力和湍动能的分布规律，以及粉尘颗粒对箱体内部的破坏作用，对剪切机的结构和边界条件设计进行了优化。结果表明：改进流道结构和输入条件可有效避免剪切机内涡流、湍流和高冲击力的产生，箱体内气固两相流的速度场、压力场和湍动能分布规律较为均匀，梯度变化较小，可有效降低箱壁损伤。     

Information sharing under different warranty policies with cost sharing in supply chains

In practice, it is found that a product warranty can be provided by either the supplier or the manufacturer. As supply chains are increasingly integrated today, warranty costs are usually shared between the supplier and the manufacturer. In this paper, we model two different warranty policies based on which party provides the warranty: manufacturer warranty and supplier warranty. Considering the demand uncertainty and demand forecast, we analyze the information sharing strategy under these two warranty policies. Our results show that the manufacturer has an incentive to share the demand forecast information under both warranty policies when the cost efficiency in providing a warranty is high, which is different from the existing literature on the incentive for demand information sharing in the supply chain. Moreover, we find that it will hurt the party who determines the warranty period but benefit the other party.     

Manufacturer warranty service outsourcing strategies in a dual‐channel supply chain

Warranty management for durable products has received increasing attention in recent years. In addition to conventionally keeping warranty in‐house, more manufacturers choose to outsource warranty service to agents. This paper explores outsourcing strategies for manufacturer warranty services in a dual‐channel supply chain by which the demand‐enhancing service can be undertaken by different supply chain parties. We show the results of three alternative outsourcing strategies for manufacturers whereby (a) the retailer undertakes the service, (b) a third party undertakes the service, and (c) both the retailer and a third party undertake the service simultaneously. According to Stackelberg game theory, we build a two‐echelon supply chain model and discuss the corresponding expressions for supply chain members' equilibrium decisions. Additionally, we compare the profits of each supply chain member and derive interesting managerial insights. When the base market size is relatively large, Scenario R helps the manufacturer and the retailer reach a “win‐win” situation.     

二步法注拉吹PET瓶的成型技术和设备

介绍用自制设备和国产原料,二步法注拉吹工艺生产PET瓶。研究了设备结构和技术参数、工艺条件如树脂含水量、瓶坯注塑成型温度、压力、时间、模温,瓶坯二次加热条件、拉伸吹塑条件等对制品质量的影响。结果表明,用本文所述原料、设备和工艺条件可以制得质量符合要求的PET瓶。该瓶适宜存放饮料、调料等液体食品。     

Ultrasonic decrosslinking of peroxide crosslinked HDPE in twin screw extrusion: Part II simulation and experiment

The simulation of ultrasonic decrosslinking of the peroxide crosslinked high‐density polyethylene (XHDPE) under static (no flow) condition and during flow in a twin‐screw extruder (TSE) is carried out. The simulation under the static condition provides dependences of the ultrasonic bubble oscillation dynamics, gel fraction, and crosslink density of the decrosslinked XHDPE on the ultrasonic amplitude, hydrostatic pressure, bubble volume fraction, and treatment time. For the decrosslinking using TSE, the simulation provides distributions of temperature, velocity, gel fraction, crosslink density, and pressure in the ultrasonic treatment zone on the ultrasonic amplitude. The simulation results of ultrasonic decrosslinking of XHDPE using TSE are compared with the experimental data. A quantitative agreement for the ultrasonic power consumption is achieved using assigned values of the initial bubble radius and volume fraction. Only a qualitative agreement on the dependence of gel fraction and crosslink density on the ultrasonic amplitude is achieved. The effect of the flow rate on the gel fraction and crosslink density of the ultrasonically decrosslinked XHDPE is overpredicted due to the absence of a suitable theory to correctly model the ultrasonic bubble nucleation. POLYM. ENG. SCI., 57:1047–1061, 2017. © 2016 Society of Plastics Engineers     

地下商场的通风与空调设计

地下空间的内部环境优劣是影响人们身心健康的重要指标。作者通过地下商场通风空调施工实践,提出控制地下内部环境与节能所采取的措施,并谈几点粗浅看法,以供设计与运行管理参考。     

沥青搅拌站除尘设备工作原理及改进方法

本文详细论述沥青搅拌站袋式除尘器工作原理，分析了影响该除尘器工作效率的因素，提出了改进方法，对同类型除尘系统的沥青搅拌站的改进和维修具有一定指导意义。     

IMPROVEMENT OF ADHESION BETWEEN ION PLATED TiN COATING AND BASE METAL BY ADDING Y

The adhesion between the ion plated TiN coating and the base metal is improved byadding Y.The machenism of the effect of Y has been discussed as well.