氧气顶吹转炉冶炼初期二次燃烧流场速度分布规律

采用先进的速度测试手段(PIV)测量了氧气顶吹转炉初期冷态二次燃烧二维流场,发现了在氧射流两侧形成两个强回流区.分析了不同截面上二次氧射流速度的分布特点及射流两侧回流区的速度分布规律.     

SelfTrust: leveraging self-assessment for trust inference in Internetware

Internetware is envisioned as a new software paradigm for software development in platforms such as the Internet.The reliability of the developed software becomes a key challenge due to the open,dynamic and uncertain nature of such environment.To make the development more reliable,it is necessary to evaluate the trustworthiness of the resource providers or potential working partners.To this end,we propose a novel trust inference approach to evaluating the trustworthiness of potential partners to guide the software development in Internetware.The main insight of our approach is to employ the self-assessment information in order to improve the trust inference accuracy.Especially,we frst extend the balance theory and the status theory from social science to incorporate self-assessment,and then propose a machine learning framework to extract several features from the extended theories and infer trustworthiness scores based on these features.Experimental results on a real software developer network show that the self-assessment information truly helps to improve the accuracy of trust inference,and the proposed SelfTrust model is more accurate than other state-of-the-art methods.     

特高压输电线基于贝瑞隆模型的距离保护

提出了应用贝瑞隆模型实现特高压输电线距离保护的新原理。介绍了应用贝瑞隆模型计算输电线故障的方法,提出了实现距离保护的原理和保护动作判据,推导了在各种故障状态下保护的动作情况,用ATP和Matlab仿真证明该原理的正确性。     

双层型腔的包装盒注塑模具设计

介绍了双层注塑结构及工作原理,指出了该模具的设计要点。该模具采用热流道技术,缩短了开模行程和成型周期;在成型面积和锁模力不变的情况下,一次注射两层制品,使生产效率提高近１倍;产品加工费用降低了４０％～５０％;节约主机投资,提高设备利用率     

类蛋白反应应用的研究进展

本文主要介绍了类蛋白反应的特点及其在食品应用方面的研究进展.     

机组跳闸对电网频率及电压稳定性的影响

小规模电网中相对容量较大的机组跳闸后,系统出现大量的功率缺额,电网将遭受严重冲击,造成频率、电压瞬间突变,甚至会破坏电力系统稳定性。对呼兴区域电网中东海拉尔电厂（以下简称东海厂）2台50 MW机组在不同负荷时段相继跳闸后系统的安全稳定性进行了分析：高峰时段机组相继故障跳闸,系统频率保持稳定,低频减载装置动作切负荷,系统电压大幅升高;低谷时段机相继跳闸后,系统频率持续震荡,经过一段时间的衰减,最终也能够维持稳定,系统电压发生较大幅度的升高并持续振荡。采取扎兰屯西郊变过电压自投电抗器的措施后,故障后系统的电压峰值和电压振荡幅度明显降低,系统电压稳定性和电压质量也得到了明显改善,取得了较好的电压调整效果。     

隧道内路面结构反射裂缝产生及影响因素分析

裂缝尖端应力强度因子是判断裂缝开裂扩展的重要指标，应用商业通用有限元软件ABAQUS．建立了8结点等参单元的有限元模型，采用奇异等参元及断裂力学理论．对隧道内水泥混凝土找平层的裂缝问题进行了数值分析，结果能真实反映隧道内路面结构裂缝的发展现象和规律．为高速公路隧道工程设计提供依据。     

色彩的空间混合在提花织物设计中的应用

本文单述了在提花织物设计中,利用色彩空混原理与组织相结合的方法,只需有限的几种色纱就可使织物获得丰富的色彩效果,而且图案蛤有很强的空间立体感.其间论述了提花织物设计中组织选择的依据。     

Thermal oxidative aging characterization of SBS modified asphalt

Both macro and micro-methods were introduced to study the physical and chemical properties of thermal oxidative aging of SBS (styrene-butadiene-styrene) modified asphalt. The physical properties of SBS modified asphalt before and after aging were analyzed by normal tests. The structure and quality variation of SBS modified asphalt during the aging process was analyzed by FTIR (Fourier transform infrared spectrum). FTIR result shows that the degeneration of SBS modified asphalt is mainly caused by oxidative reaction and rupture of C=C double bond. The molecular weight variations of asphalt function groups and SBS polymer were studied by GPC (Gel Permeation Chromatography). GPC result shows that small molecules transform into larger one in asphalt and SBS polymer molecule degrade during the aging process. SBS polymer may lose its modifying function after long time aging.     

基于二进制微分进化算法和目标函数分解的大规模机组组合求解

为了避免在机组组合求解过程中将机组启停计划和负荷经济调度两者形成内外双层嵌套求解,从而导致计算比较耗时的问题,引入启运机组的总平均燃料成本和系统旋转备用剩余量这2个可调节的子目标,将传统的机组组合模型分解成2个独立的优化目标,构建了一种基于目标函数分解的二阶段可独立求解的机组组合模型。采用一种改进的二进制微分进化算法对第一阶段的机组启停计划目标进行求解,对每个代表机组启停状态的个体编码采用机组最小启停时间约束、旋转备用约束、机组去组合等处理机制,有效保证了每个解的有效性并缩小了算法的搜索空间。根据求解得到的机组启停状态,采用半定规划法求解第二阶段的负荷经济调度目标。采用经典的测试算例验证了所提方法在大规模机组组合求解中的有效性。