TiC－PHASE DIFFUSION LAYER FORMATION IN TITANIUM CLAD STEEL COMPOSITE HAVING AN INTERMEDIATE LAYER OF α－Fe

ＴｉＣ－ＰＨＡＳＥＤＩＦＦＵＳＩＯＮＬＡＹＥＲＦＯＲＭＡＴＩＯＮＩＮＴＩＴＡＮＩＵＭＣＬＡＤＳＴＥＥＬＣＯＭＰＯＳＩＴＥＨＡＶＩＮＧＡＮＩＮＴＥＲＭＥＤＩＡＴＥＬＡＹＥＲＯＦα－ＦｅＸｉａＣｈａｎｇｑｉｎｇ；ＪｉｎＺｈａｎｐｅｎｇ（Ｄｅｐａｒｔｍｅｎ...     

STRAIN INDUCED STRUCTURAL TRANSITION OF INTERFACES AND TWINS IN A HOT－DEFORMED DUAL－PHASE TIAL ALLOY

ＳＴＲＡＩＮＩＮＤＵＣＥＤＳＴＲＵＣＴＵＲＡＬＴＲＡＮＳＩＴＩＯＮＯＦＩＮＴＥＲＦＡＣＥＳＡＮＤＴＷＩＮＳＩＮＡＨＯＴ－ＤＥＦＯＲＭＥＤＤＵＡＬ－ＰＨＡＳＥＴＩＡＬＡＬＬＯＹＣＨＥＮＧｕｏＦｉａｎｇ；ＷＡＮＧＪｉｎｇｕｏ；ＺＨＡＮＧＬｉｃｈｕｎａｎｄ...     

DSC STUDY OF MARTENSITIC TRANSFORMATION KINETICS IN A Cu－Zn－Al－Mn－Ni SHAPE MEMORY ALLOY

ＤＳＣＳＴＵＤＹＯＦＭＡＲＴＥＮＳＩＴＩＣＴＲＡＮＳＦＯＲＭＡＴＩＯＮＫＩＮＥＴＩＣＳＩＮＡＣｕ－Ｚｎ－Ａｌ－Ｍｎ－ＮｉＳＨＡＰＥＭＥＭＯＲＹＡＬＬＯＹＧＥＮＧＧｕｉｌｉ;ＢＡＩＹｕｊｕｎ;ＰＥＮＧＱｉｆｅｎｇ（ＩｎｓｔｉｔｕｔｅｆｏｒＭａｔｅｒｉａ...     

ELECTROPLATING OF AMORPHOUS Al－Mn ALLOYS （I） KINETIC FEATURES OF ELECTRODEPOSITION OF PURE Al

ＥＬＥＣＴＲＯＰＬＡＴＩＮＧＯＦＡＭＯＲＰＨＯＵＳＡｌ－ＭｎＡＬＬＯＹＳ（Ｉ）ＫＩＮＥＴＩＣＦＥＡＴＵＲＥＳＯＦＥＬＥＣＴＲＯＤＥＰＯＳＩＴＩＯＮＯＦＰＵＲＥＡｌ￥ＺｈａｏＧｕａｎｇｗｅｎ；ＺｈｕＴｅｎｇ；ＬｉｕＬｉａｎｙｕ（Ｄｅｐａｒｔｍｅｎｔｏｆ...     

DIFFUSION PHENOMENA AND MICROSTRUCTURE STABILITY OF Ni－Cr－Al－Y－Si COATING ON THENi_3Al BASED ALLOY SUBSTRATE

ＤＩＦＦＵＳＩＯＮＰＨＥＮＯＭＥＮＡＡＮＤＭＩＣＲＯＳＴＲＵＣＴＵＲＥＳＴＡＢＩＬＩＴＹＯＦＮｉ－Ｃｒ－Ａｌ－Ｙ－ＳｉＣＯＡＴＩＮＧＯＮＴＨＥＮｉ_３ＡｌＢＡＳＥＤＡＬＬＯＹＳＵＢＳＴＲＡＴＥＺ．Ｐ．Ｘｉｎｇ;Ｙ．Ｆ．Ｈａｎ;Ｙ．Ｌ．ＪｉａｎｄＭ．Ｇ?..     

SUBSTRUCTURE OF BONDING ZONE IN AN EXPLOSIVE CLADDED TITANIUM-MILD STEEL SYSTEM

ＳＵＢＳＴＲＵＣＴＵＲＥＯＦＢＯＮＤＩＮＧＺＯＮＥＩＮＡＮＥＸＰＬＯＳＩＶＥＣＬＡＤＤＥＤＴＩＴＡＮＩＵＭ－ＭＩＬＤＳＴＥＥＬＳＹＳＴＥＭ￥ＹａｎｇＹａｎｇ；ＺｈａｎｇＸｉｎｍｉｎｇ（ＣｅｎｔｒａｌＳｏｕｔｈＵｎｉｖｅｒｓｉｔｙｏｆＴｅｃｈｎｏｌｏｇ...     

EFFECT OF MILLING INTENSITY ON STRUCTURAL CHANGES OF MIXED Al－Fe－Ni POWDERS IN MECHANICAL ALLOYING PROCESS

ＥＦＦＥＣＴＯＦＭＩＬＬＩＮＧＩＮＴＥＮＳＩＴＹＯＮＳＴＲＵＣＴＵＲＡＬＣＨＡＮＧＥＳＯＦＭＩＸＥＤＡｌ－Ｆｅ－ＮｉＰＯＷＤＥＲＳＩＮＭＥＣＨＡＮＩＣＡＬＡＬＬＯＹＩＮＧＰＲＯＣＥＳＳ￥ＬｉｕＺｕｙａｎ；ＬｉａｎｇＧｕｏｘｉａｎ；ＷａｎｇＥｒｄｅ（Ｓ...     

INVESTIGATION ON THIN－WALL EFFECT OF A DIRECTIONALLY SOLIDIFIED SUPERALLOY BY USING TUBULAR SPECIMENS

ＩＮＶＥＳＴＩＧＡＴＩＯＮＯＮＴＨＩＮ－ＷＡＬＬＥＦＦＥＣＴＯＦＡＤＩＲＥＣＴＩＯＮＡＬＬＹＳＯＬＩＤＩＦＩＥＤＳＵＰＥＲＡＬＬＯＹＢＹＵＳＩＮＧＴＵＢＵＬＡＲＳＰＥＣＩＭＥＮＳＲ．Ｚ．ＣｈｅｎａｎｄＨ．Ｗ．Ｚｈａｎｇ（ＢｅｉｊｉｎｇＩｎｓｔｉｔｕｔ...     

ORDER STATE AND STABILITY OF MARTENSITE IN AN AIR-QUENCHED Cu-Zn-Al ALLOY

ＯＲＤＥＲＳＴＡＴＥＡＮＤＳＴＡＢＩＬＩＴＹＯＦＭＡＲＴＥＮＳＩＴＥＩＮＡＮＡＩＲ－ＱＵＥＮＣＨＥＤＣｕ－Ｚｎ－ＡｌＡＬＬＯＹ￥ＷａｎｇＭｉｎｇｐｕ；ＪｉｎＺｈａｎｐｅｎｇ；ＹｉｎＺｈｉｍｉｎ；ＸｕＧｅｎｙｉｎ（ＤｅｐａｒｔｍｅｎｔｏｆＭａｔｅｒｉａ...     

INTERFACE－RELATED DEFORMATION MECHANISMS AND DISLOCATION MOBILITIES IN TWO－PHASE TITANIUM ALUMINIDE ALLOYS

ＩＮＴＥＲＦＡＣＥ－ＲＥＬＡＴＥＤＤＥＦＯＲＭＡＴＩＯＮＭＥＣＨＡＮＩＳＭＳＡＮＤＤＩＳＬＯＣＡＴＩＯＮＭＯＢＩＬＩＴＩＥＳＩＮＴＷＯ－ＰＨＡＳＥＴＩＴＡＮＩＵＭＡＬＵＭＩＮＩＤＥＡＬＬＯＹＳＣＨＲＩＳＴＯＰＨＵｌｒｉｃｈ，ＳＰＡＲＫＡＵｌｆＡＰＰＥ...     

基于改进灰色关联度的液压系统可靠性模型优选方法

针对目前以假设检验等方法进行模型优选区分度和准确性不高的问题,提出了基于斜率相似和中值相近的灰色关联度模型优选方法,研究了该优选方法的算法。根据采集的数控磨床液压系统的可靠性数据,分别用5种概率密度函数对液压系统进行了建模,并利用所提模型优选方法对5种分布模型进行了拟合优度检验,结果显示液压系统最适合于伽马分布。与相关系数法、传统灰色关联度法、K-S检验等方法进行模型优选相比,基于改进灰色关联度的模型优选方法的区分度分别提高了86.42%、67.27%、2.59%,且准确性很高,优选效果良好。所述的模型优选方法可以用于可靠性模型的优选,也可以为其他曲线拟合的优选提供参考。     

输气管道腐蚀的最优灰色组合预测模型

    在不等时距序列灰色预测的基础上,提出了适用于输气管道腐蚀的不等时距最优组合灰色预测模型.首先,选用两种模型精度较高的不等时距灰色预测方法建立了输气管道腐蚀预测的单项模型,然后,利用最小二乘意义下的模型误差最小化方法确定出各单项灰色预测模型的权重,建立了最优组合预测模型.此预测模型综合利用了参与组合的各单一模型的有效信息,因而可以更加客观地反映输气管道腐蚀变化趋势.通过实例对比分析结果表明,此模型预测精度较高,可以作为输气管道腐蚀预测的有效工具.     

新一代的溶液几何模型及其今后的展望

由二元系估算三元系和多元系的几何模型是当今在热力学和相图计算中用得最为广泛的一种溶液模型。但现有的这类几何模型由于假设了模型的设定与所处理的具体体系无关，结果造成了一些不可克服的固有缺陷，为了解决这个３０多年来一直存在的问题，我们摒存了这一不合理的假设而假定模型的设定应与所处理的体系有关。当我们引进了“相似系数”这一新概念以后，一种新的更合理的模型出现了。我们将这一类模型统称为新一代的几何模型。这     

Study on Grey Forecasting Model of Copper Extraction Rate with Bioleaching of Primary Sulfide Ore

A model GM(grey model)(1,1) for forecasting the rate of copper extraction during the bioleaching of primary sulphide ore was established on the basis of the mathematical theory and the modeling process of grey system theory. It was used for forecasting the rate of copper extraction from the primary sulfide ore during a laboratory microbial column leaching experiment. The precision of the forecasted results were examined and modified via "posterior variance examination". The results show that the forecasted values coincide with the experimental values. GM(1,1) model has high forecast accuracy;and it is suitable for simulation control and prediction analysis of the original data series of the processes that have grey characteristics,such as mining,metallurgical and mineral processing,etc. The leaching rate of such copper sulphide ore is low. The grey forecasting result indicates that the rate of copper extraction is approximately 20% even after leaching for six months.     

数据处理的等间距化GM(1,1)模型与方法

分析数据处理的现状后，运用灰色系统理论，建立了数据处理的等间距化GM(1，1)模型，给出了精度检验方法。编制了MATLAB程序，给出了数据处理实例。该模型不仅适合于等间距建模，也适合于非等间距建模，具有精度高、使用简便等特点，值得在数据处理中推广使用。     

采用锰矿从水溶液中吸附铅和镉离子(英文)

采用低成本的本地可得的天然锰矿作为吸附剂,研究吸附工艺从水溶液中脱除铅离子和镉离子。利用伪一级、伪二级动力学和颗粒内扩散模型检验动力学吸附数据,计算和比较这些动力学模型的吸附速率常数,发现用伪二级动力学模型能最佳地描述吸附动力学。将 Langmuir 和 Freundlich 等温吸附模型用来拟合不同温度下的平衡数据,发现实验数据与 Langmuir 模型拟合得更好。采用 Langmuir 等温吸附模型计算出锰矿吸附铅离子和镉离子的最大容量分别为 98 和 6.8 mg/g。计算了热力学参数,如吸附吉布斯自由能的变化、焓变与熵变。结果表明,锰矿作为吸附剂对铅和镉的吸附反应是自发的吸热反应。因此,锰矿作为一种天然的矿物吸附剂,可以替代现有的吸附剂来脱除水溶液中的铅离子和镉离子。     

电液比例系统的广义预测控制研究

针对具有非线性和时变特性的电液比例系统,研究了自适应预测控制器的设计问题.采用隐式广义预测控制算法,无需辨识对象模型参数,而是利用输入/输出数据直接辩识控制器参数,以求解最优控制增量,具有计算量小、实时性高的特点.仿真结果表明,在不需要关于被控对象先验知识的情况下,隐式广义预测控制器可以很好地跟踪设定值的变化,同时对于系统外部干扰和模型参数的变化具有很好的适应能力,在电液比例系统控制器的设计中具有良好的应用前景.     

基于灰色理论的机床润滑泵泵芯磨损可靠性预测

为了掌握机床设备润滑泵泵芯磨损的变化规律,分析集中润滑系统的可靠性。基于灰色预测的方法对润滑泵泵芯磨损进行预测。建立了灰色预测G(1,1)模型;然后,结合润滑泵2000 h磨损试验数据进行预测;通过模型得到机床润滑泵泵芯2000 h后的5个磨损量。通过将试验数据与预测数据进行对比,验证了灰色预测模型的准确性和可行性。结果表明:利用灰色预测模型能获得后期润滑泵泵芯的磨损情况,且该方法的预测结果符合磨损相关规律,对后续机床设备润滑泵的稳定运行及泵芯的修理和更换具有参考意义。     

缸径液压支架液压系统的动态特性仿真研究

以ZY12000／28／64D型两柱掩护式大缸径液压支架为研究对象,采用灰箱建模方法建立数学模型,运用仿真软件Matlab／Simulink对液压支架液压控制系统的卸载过程进行动态特性的仿真研究并进行分析,得到适当增大控制端面积,可以减小卸载液压冲击。     

Linear and Non-linear Modeling of Cement-bonded Moulding Sand System Using Conventional Statistical Regression Analysis

A cement-bonded moulding sand system takes a fairly long time to attain the required strength. Hence, the moulds prepared with cement as a bonding material will have to wait a long time for the metal to be poured. In this work, an accelerator was used to accelerate the process of developing the bonding strength. Regression analysis was carried out on the experimental data collected as per statistical design of experiments (DOE) to establish input-output relationships of the process. The experiments were conducted to measure compression strength and hardness (output parameters) by varying the input variables, namely amount of cement, amount of accelerator, water in the form of cement-to-water ratio, and testing time. A two-level full-factorial design was used for linear regression model, whereas a three-level central composite design (CCD) had been utilized to develop non-linear regression model. Surface plots and main effects plots were used to study the effects of amount of cement, amount of accelerator, water and testing time on compression strength, and mould hardness. It was observed from both the linear as well as non-linear models that amount of cement, accelerator, and testing time have some positive contributions, whereas cement-to-water ratio has negative contribution to both the above responses. Compression strength was found to have linear relationship with the amount of cement and accelerator, and non-linear relationship with the remaining process parameters. Mould hardness was seen to vary linearly with testing time and non-linearly with the other parameters. Analysis of variance (ANOVA) was performed to test statistical adequacy of the models. Twenty random test cases were considered to test and compare their performances. Non-linear regression models were found to perform better than the linear models for both the responses. An attempt was also made to express compression strength of the moulding sand system as a function of mould hardness.