猪皮胶原肽-锌螯合物的制备工艺研究

研究猪皮胶原肽-锌螯合物的制备工艺。以猪皮为原料，制备猪皮胶原肽-锌螯合物；以螯合率为指标，研究了猪皮胶原肽与锌质量比、pH、温度、时间对螯合率的影响；通过单因素试验、响应面法试验考察优化猪皮胶原肽的富锌工艺。结果显示，猪皮肽-锌螯合的最佳工艺为猪皮肽与锌质量比2:1，螯合pH 7.0，螯合温度50 ℃，螯合时间50 min，在此条件下，试验螯合率最佳，为69.27%，与模型预测值69.92%相近。该研究为新型生物肽 锌螯合物的研制、猪皮的高值化利用提供了依据。     

Optimizing Concurrent Product Development Process Using Genetic Algorithm

0　IntroductionTimesaving,timetomarketandcycletimereductionarethenewgoalsandaimsforenterprisesinordertosuccessfullycompeteintothemodernglobalmarket[1].Thereisnodoubtthatconcurrentconsiderationofproductandprocessdesignimprovesproductqualityandreducesthere-designwork,whichleadstoshorterproductlead-time.Buttheconcurrentdevelopmentfashionbringsaboutmoreobstaclessuchascomplextimeorder,informationandresourceconstrainednatureofrelationshipsbetweenactivitiestothedesignprocess,whichleadtothefactthatiti…     

波动方程预测误差的统计分析与Gauss过程建模

为了提高预测复杂波动过程的能力,结合物理模型和统计方法建立了"波动方程-Gauss过程"模型。通过误差分析,波动方程的理论预测与实际数据的差值被分解为3个部分,并拟合为Gauss过程模型:外力和初边值条件偏移带来的误差拟合为正交预测因子的线性叠加;模型假设不成立、数值解收敛性等因素导致的误差拟合为Gauss过程项;测量误差拟合为白噪声。"波动方程-Gauss过程"模型的预测因子是波动过程的基函数组,作为波动的本征特性不受外界影响,体现了波动的物理机理。基于实验数据的预测效果检验说明模型的基函数组和Gauss过程项都显著提高了预测波动过程的能力。     

基于时间Petri网的Artifact有效性的验证

在面向Artifact的业务流程管理系统中,业务核心数据实体Artifact具有动态时变性。Artifact状态是否正常关系到流程的运转成功与否,因此,验证Artifact的有效性是一个关键问题。针对该问题本文基于时间Petri网理论对Artifact的相关流程进行分析并获得其业务要求树,然后根据流程记录数据库中Artifact的快照构建出相应快照树,最后通过比较业务要求树和快照树而得以验证Artifact是否有效。     

新型絮凝剂对拜耳法溶出赤泥沉降性能的影响

针对河南某一水硬铝石型氧化铝拜耳法溶出赤泥,采用自制丙烯酰胺-丙烯酸钠-β-衣康酸单甲酯共聚物新型絮凝剂(ASAM)对其进行沉降实验。考察ASAM的特性黏度、添加量对其沉降性能的影响,并选取性能较优良的ASAM-2号样品和商品絮凝剂PAS-3号、0228和Alclar665作对比实验,研究ASAM-2号样品对不同干赤泥浆料的沉降效果。研究结果表明:自制ASAM的絮凝性能优异,沉降速度与絮凝剂0228的相当,明显高于国产PAS-3号和Alclar665的沉降速度,而且上清液澄清度比Alclar665的高;赤泥浆液干赤泥含量为108.4g/L,ASAM添加量为100g/t时,前5min平均沉降速度为1.22m/h,底流液固压缩比为2.86,沉降性能明显优于商品絮凝剂。     

Tracking Co-evolution of Behavior and Relationships with Mobile Phones

The co-evolution of social relationships and individual behavior in time and space has important implications,but is poorly understood because of the difficulty of closely tracking the everyday life of a complete community.We offer evidence that relationships and behavior co-evolve in a student dormitory,based on monthly surveys and location tracking through resident cellular phones over a period of nine months.We demonstrate that a Markov jump process could capture the co-evolution in terms of the rates at which residents visit places and friends.Our co-evolution model will be useful in bridging sensor networks data and organizational dynamics theories,simulating different ways to shape behavior and relationships,and turning mobile phone data into data products.     

100万t棒材生产线工艺流程及设备配置简介

文章介绍了莱钢集团棒材厂年产10077t棒材生产线的生产工艺流程及设备配置情况，重点介绍了该生产线打破传统工艺设计，用较少的投入、较短的时间，顺利完成了生产线的工艺设计、设备选型、设备安装、试生产、周达产最好历史记录。对新建棒材生产线有较好的借鉴、指导意义。     

Effective Factors on Forming Precision in Patternless Casting Manufacturing Technique

The patternless casting manufacturing (PCM) technique, which adopts a new concept of double scanning method, combines the principle of discreteness and deposition with resin-bonded sand technique. This paper is to evaluate the dimensional accuracy of sand mould on PCM. The two important factors-the liquid penetration rule in the space of particles and the shape and dimension of the agglomeration unit body, which influence the process parameters such as scanning speed, layer thickness, liquid flux on dimension accuracy, and surface qualities, were investigated systematically, thus the theoretical basis for these parameters was provided. Experiments on rapid manufacturing of sand mould were carried out, and the results of the free penetration and the constraint penetration well verified the relationship of the two factors and the process parameters.     

碎屑机及其生产线的设计与应用

介绍了SXJ型碎屑机的设计制造的特点，工作原理，技术指标，碎屑生产线及其应用，为了扩大废钢,薄壳物料的加工范围，提供了简单，易行的方法。     

高等职业院校化工类专业《物理化学》课程教学内容的改革

根据高等职业教育的特色需要,本文提出了化工类专业<物理化学>课程教学内容改革的指导思想、总体安排和每一章、节的改革方案.