浅论检修钳工竞赛训练方法与技巧——以检修钳工国赛试题六方锉配为例

镶配件制作是职业学院机械类专业专业技能实训环节的重要组成部分,也是培养高技能人才的重要手段。本文以全国化工检修钳工竞赛为契机,从加工工艺的确定、设备及工量具的选用以及学生综合素质提升等方面出发,对如何保证加工精度、提高学生竞赛成绩进行了探讨。     

Multi-criteria assessment of offshore wind turbine support structures based on dynamic property optimization

Increasing size of wind turbine and deep water deployment have raised the issue of appropriate selection of the most suitable support structure to make offshore wind energy cost competitive.The paper presents an optimization methodology for decision making process of bottom mounted supports of offshore wind turbines （OWTs） through reasonable engineering attributes derivation.Mathematic models of support structures are reduced by the generalized single-degree-of-freedom theory with relatively fewer structural parameters.Soft-stiff design optimization based on dynamic properties of OWTs is performed for monopile and lattice supports with different wind turbines,water depth and hub height.Attributes of support structures,wind turbines and environment conditions are applied in the multi-criteria decision making method——TOPSIS for benchmarking of those options.The results illustrate the effectiveness of the proposed optimazation methodology combined with economical and environmental attributes together.     

Application of interacting multi-model algorithm in gyro signal processing

There is one problem existing in gyroscope signal processing,which is that single models can＇ t adapt to change of carrier maneuvering process.Since it is difficult to identify the angular motion state of gyroscope carriers,interacting multiple model （IMM） is employed here to solve the problem.The Kalman filter-based IMM （IMMKF） algorithm is explained in detail and its application in gyro signal processing is introduced.And with the help of the Singer model,the system model set of gyro outputs is constructed.In order to demonstrate the effectiveness of the proposed approach,static experiment and dynamic experiment are carried out respectively.Simulation analysis results indicate that the IMMKF algorithm is excellent in eliminating gyro drift errors,which could adapt to the change of carrier maneuvering process well.     

A trusted mobile payment environment based on trusted computing and virtualization technology

In this paper, we propose a trusted mobile payment environment （TMPE） based on trusted computing and virtualization technology. There are a normal operating system （OS） and a trusted OS （TOS） in TMPE. We store the image of TOS in a memory card to hinder tampering. The integrity of TOS is protected by means of a trusted platform module （TPM）. TOS can only be updated through a trusted third party. In addition, virtualization technology is applied to isolate TOS from normal OS. Users complete ordinary affairs in normal OS and security-sensitive affairs in TOS. TMPE can offer users a highly protected environment for mobile payment. Moreover, TMPE has good compatibility in different hardware architectures of mobile platforms. As the evaluation shows, TMPE satisfies the requirement of mobile payment well.     

呋喃取代的多芳基咪唑的合成与表征

以呋喃甲醛为原料,在维生素B1的促进下合成出呋喃偶姻,再以呋喃偶姻为原料,通过吡啶氧化,在硫酸铜溶液中合成出呋喃偶酰。以呋喃偶酰、芳香醛、醋酸铵和杂环胺为原料,分别采用一锅3组分和一锅4组分合成法制备了含1个呋喃基团、2个呋喃基团和3个呋喃基团的多芳基1H-咪唑化合物。其中,采用苯偶酰、醋酸铵和糠醛合成了2-(呋喃基-2)-4,5-二苯基-1H-咪唑衍生物;以呋喃偶酰、醋酸铵和苯甲醛合成了4,5-二呋喃基-2-苯基-1H-咪唑衍生物;以呋喃偶酰、2-甲基呋喃、醋酸铵和糠醛合成了4,5-二(呋喃基2)-1-(2-呋喃甲基)-2-苯基-1H-咪唑衍生物。并采用IR,1H NMR对所合成的呋喃基取代的多芳基1H-咪唑衍生物的结构进行了表征和确认。     

基于某高层建筑裙房不均匀沉降的探讨

基于上海某高层建筑裙房不均匀沉降的工程实例,根据该工程原结构设计、地基处理、施工及后续对裙房地基加固等情况,结合相关的文献资料,进行了裙房的地基承载力验算和沉降计算,以及分析了造成该裙房不均匀沉降的原因,并提出了今后在高层裙房的地基基础设计、施工及加固中的有关建议.     

秦皇岛市宜居城市建设问题分析

宜居城市是近年来我国城市建设的新方向,但目前对宜居城市的定义和内容并没有统一的标准。宜居城市具有复杂的内涵,打造宜居城市需要多方面的配合。本文以秦皇岛市为宜居城市现设对象,分析其在宜居建设发展道路上已具有的优势和潜力,同时提出城市宜居建设过程中的制约性条件。     

用改性粉煤灰处理废水及对其COD的测定

由于社会经济的快速发展和工业化的提高,水环境污染越来越严重。本文通过在电热厂实地取样粉煤灰,并用改性前后的粉煤灰分别处理两组不同的废水,用化学的方法测定各组废水处理前后的COD含量,并作比较。实验结果表明,粉煤灰的改性对处理废水环节有很大的效果提升,对粉煤灰改性的研制为废水处理环节提供了更加高效环保的途径,起到了保护环境的作用。     

6000系铝合金晶间腐蚀研究进展

介绍了与晶界直接相关的铝合金腐蚀类型,概述了合金元素和稀土元素对6000系铝合金晶间腐蚀的影响,重点介绍了热处理条件对6000系铝合金晶间腐蚀敏感性的影响．大量实验显示,热处理影响腐蚀模式,且晶间腐蚀向点蚀的转变与固溶处理温度、冷却速度,以及随后的人工时效温度和时效时间等诸多因素有关,发现经适当条件热处理的6000系铝合金可免受局部腐蚀影响．展望了铝合金晶间腐蚀研究的发展方向．     

螺环-双环笼状磷酸酯的合成与性质

以含季戊四醇骨架的螺环磷酸酯二酰氯(PDD)和双环笼状磷酸酯(PEPA)为反应物,合成既有螺环又有双环笼状的磷酸酯阻燃剂PDD-PEPA,对该阻燃剂的合成条件(三乙胺催化剂用量、反应时间)进行优化,通过质谱、红外光谱和核磁共振等方法对PDD-PEPA的结构进行表征,采用热重分析对PDD-PEPA在氮气氛下的热稳定性和成炭性进行了分析.结果表明:以乙腈为溶剂、三乙胺与理论释放氯化氢的摩尔比为1.2:1、回流温度下反应10 h时可得到较高产率的PDD-PEPA;该条件下制得的阻燃剂理论磷含量为21.2%,起始分解温度为351℃,650℃时的残炭率为63.6%.