我国煤炭企业发展循环经济研究

首先分析了煤炭企业发展循环经济的必要性,在此基础上对煤炭企业发展循环经济的主要内容进行了具体阐释,最后着重探讨了煤炭企业发展循环经济的基本原则。     

促进节能减排的金融支持体系研究

金融是现代经济的核心,促进节能减排离不开金融的支持。分析了我国金融支持节能减排的现状、存在的问题,构建了促进节能减排的金融支持体系。     

基于随机滤波器的无位置传感器SMPM电机磁通辨识

用随机滤波器对无速度传感器的交流永磁电机的转子磁通进行观测.观测过程中为了降低计算量,采用参数的混合辨识方法,把滑模观测器引入磁通辨识系统,代替位置传感器对转子位置和速度进行估计.用Matlab7.0建立离线辨识模型,仿真分析了转子磁通估计值与实际值之间的误差,以及磁通估计值随负载转矩大小的变化情况.     

管道漏磁检测缺陷识别技术

针对神经网络法对管道缺陷进行识别存在所需样本数据量大、容易陷入局部极值、泛化能力没有保证等问题,提出一种新的机器学习方法,即支持向量机法.介绍了支持向量机的分析原理,以碗状缺陷为例,采用ANSYS有限元分析软件对40组不同尺寸的缺陷进行仿真,将得到的40组漏磁数据和10组实测数据作为学习样本,另外10组新数据作为验证数据,以MATLAB软件为平台进行了识别实验.实验结果表明,识别误差均在5％以下,且泛化能力强,识别方法简单,在有限样本情况下比神经网络法更具优势.     

New explicit algebraic stress and flux model for active scalar and simulation of shear stratified cylinder wake flow

On the numerical simulation of active scalar, a new explicit algebraic expression on active scalar flux was derived based on Wikstr?m, Wallin and Johansson model (a ^WWJ model). Reynolds stress algebraic expressions were added by a term to account for the buoyancy effect. The new explicit Reynolds stress and active scalar flux model was then established. Governing equations of this model were solved by finite volume method with unstructured grids. The thermal shear stratified cylinder wake flow was computed by this new model. The computational results are in good agreement with laboratorial measurements. This work is the development on modeling of explicit algebraic Reynolds stress and scalar flux, and is also a further modification of the a ^WWJ model for complex situations such as a shear stratified flow. Supported by the National Nature Science Foundation of China (Grant Nos. 50679019, 50009001), the National Basic Research Program of China (“973” Project) (Grant No. 2008CB418202), the Project of “Six Talent Peak” of Jiangsu Province (08-C), Social Technology Development Foundation of Jiangsu Province (Grant No. BS2006095) and the “908” Special Foundation of Jiangsu Province (Grant No. JS-908-02-06)     

Flux pinning effect of cubic equiaxed morphology and its Ti stabilizing in Nb<Subscript>3</Subscript>Sn superconductors

Two sets of internal-Sn Nb3Sn superconducting strands were fabricated through RRP method, one with 2 wt% of Ti alloyed in Sn core and the other just pure Sn. Four reaction temperatures of 650℃, 675℃, 700℃ and 725℃ and 128 h duration were applied for A15 phase formation heat treatment after Cu-Sn alloying procedure of 210℃/50 h + 340℃/25 h. For the heat-treated coil samples, transport non-Cu JC was examined through standard 4-probe technique and phase microstructure was observed by means of Field Emission Sc...     

沸腾两相流动压力波动信号的特性

研究了竖直管内沸腾两相流动时压力波动信号的特性,对压力波动时间序列进行了标准偏差分析、功率谱密度函数分析、分维数分析、相关维分析及Kolmogorov熵分析,考察了热流密度对压力波动的影响规律.结果表明沸腾两相流动具有非线性混沌特性,且热流密度对各特征参数有不同影响.     

助熔剂对Y_2O_2S∶Ti长余辉磷光体发光性能的影响(英文)

用高温固相还原法合成了无稀土激活离子Y2O2S∶0.09Ti长余辉发光材料,研究了 Li2CO3,Na2CO3,K2CO3,K3PO4和K2HPO4等 5种助熔剂对Y2O2S∶Ti磷光体发光性能的影响。结果表明:除了 K2HPO4外,加入 Li2CO3,Na2CO3, K2CO3与 K3PO4助熔剂均可得到单相Y2O2S∶Ti晶体。发射光谱结果显示:不同助熔剂的加入并没有改变样品发射谱主峰位置(565 nm),但对其峰强度产生明显影响。助熔剂也显著改善了Y2O2S∶Ti的余辉亮度,特别是Li2CO3。10 min衰减时,Y2O2S∶Ti样品的余辉亮度从加 K2CO3助熔剂的0.15 mcd/m2增加到加Li2CO3助熔剂的10.1 mcd/m2。用紫外光激发样品,移去光源后,加Li2CO3助熔剂合成的样品在暗室中的余辉时间可持续达 5 h(0.32 mcd/m2) 。     

高温快烧釉中彩颜料的研究

为解决日用瓷铅镉溶出问题和提高装饰档次，研制成功１８种高温快烧颜料色基及专用熔剂。经测试，１８种颜料的各项指标全部达到国家标准要求，铅镉溶出量全部为０．０ｍｇ／ｄｍ２．     

毛细管膜生物反应器中加沸石对膜污染的影响

通过处理生活污水时毛细管膜污染状况的研究，考察了膜水通量随沸石投加量而变化的情况。在操作压力为0．025MPa，膜面流速为0．8m/s，p(MLSS)为3000mg／L的条件下，与不投加沸石直接处理生活污水相比，沸石的投加使膜水通量上升，总阻力下降；试验还探讨了沸石最佳投加量问题。结果表明，沸石的投加可改善膜面泥饼性质，提高水通量，是一种积极的膜污染防治手段。