湿法造粒生产炭黑新技术的开发

通过对湿法造粒生产炭黑新技术的研究与开发,用焦炉煤气代替油作为燃料,实现了焦炉煤气综合利用,降低了炭黑生产成本,减轻了环境污染,提高了炭黑产品质量,增加了炭黑品种,经济和社会效益显著。     

一种辊压式锌电极湿贮存特性

本文介绍了用PTFE作粘结剂的辊压式锌电极。它不仅具有优异的机械强度,而且又有很好的电化学活性,可以在500mA/cm~2高电流密度下进行放电,同时还具有耐湿贮存的特性。     

Technora纤维的处理条件对其性能影响的探讨

研究了不同环境下的热处理、湿处理以及等离子处理对Technora纤维力学性能以及表面形态的影响,并初步探讨了其影响规律和机理.研究表明:在本实验测试范围内,经热处理后,Technora纤维的力学性能有一定程度的下降;湿处理时间对纤维的力学性能没有显著影响,随着湿处理温度的升高,纤维的断裂强度有所下降,而断裂伸长有小幅度的提高;等离子处理后,纤维表面有刻蚀,纤维的断裂强度和断裂伸长下降.     

湿式多片制动器衬片压力分布模型及性能计算

在大型工程机械车辆中，湿式多片制动器正在逐步取代传统的干式制动器。针对湿式多片制动器的工作特性，分析了衬片压力均布模型的局限性，进而提出新的分布模型，并推导相应的性能参数计算公式，为国内开发设计湿式多片制动器提供了理论依据。     

低功率刻蚀工艺均匀度研究

在二氧化硅刻蚀工艺中,有时为了控制氧化膜的损伤,需要采用低功率刻蚀工艺。文中研究了在低射频功率条件下,通过改变磁场强度、暖机条件及反应气体的组成,对刻蚀均匀度的影响。实验结果表明,在低功率条件下,改变磁场强度和暖机条件对刻蚀均匀度的改变有限,但当向主刻蚀气体中加入氧气后,能较大程度地改变刻蚀均匀度。     

钒钛铁精矿润磨试验研究

针对川威集团自产的钒钛铁精矿,在钒钛铁精矿、膨润土理化性能测定结果基础上,进行了钒钛铁精矿的润磨、成球试验研究,探究了该钒钛铁精矿较佳的润磨工艺参数。     

Virtual metrology modeling of time-dependent spectroscopic signals by a fused lasso algorithm

This paper proposes a fused lasso model to identify significant features in the spectroscopic signals obtained from a semiconductor manufacturing process, and to construct a reliable virtual metrology (VM) model. Analysis of spectroscopic signals involves combinations of multiple samples collected over time, each with a vast number of highly correlated features. This leads to enormous amounts of data, which is a challenge even for modern-day computers to handle. To simplify such complex spectroscopic signals, dimension reduction is critical. The fused lasso is a regularized regression method that performs automatic variable selection for the predictive modeling of highly correlated datasets such as those of spectroscopic signals. Furthermore, the fused lasso is especially useful for analyzing high-dimensional data in which the features exhibit a natural order, as is the case in spectroscopic signals. In this paper, we conducted an experimental study to demonstrate the usefulness of a fused lasso-based VM model and compared it with other VM models based on the lasso and elastic-net models. The results showed that the VM model constructed with features selected by the fused lasso algorithm yields more accurate and robust predictions than the lasso- and elastic net-based VM models. To the best of our knowledge, ours is the first attempt to apply a fused lasso to VM modeling.     

Influence of physicochemical binder properties on agglomeration of wheat powder in couscous grain

Wet agglomeration mechanisms developing in low shear mixers have been described considering a fractal morphogenesis process that links the median size of the agglomerates with their solid volume fraction via a fractal dimension. It appears fundamental to integrate the polydispersity of the generated structures (nuclei, agglomerates, dough pieces) in the analysis of the agglomeration process in order to approach the industrial problems. The objective of this study is to correlate the influence of the physicochemical characteristics of several liquid binders, on the fractal agglomeration mechanisms. To do so, we considered the values of the fractal model parameters. The obtained results confirmed that semolina wet agglomeration follows a fractal morphogenesis for the different applied liquid binders. Our results also showed a marked influence of the studied physicochemical properties of the liquid binder on the value of the fractal model parameters. During wet agglomeration in low shear mixers, the mechanisms implied during agglomeration (wetting, nucleation and growth) do not occur consecutively, but they coexist throughout at each water contents.     

The Use of Surface Analysis Techniques to Determine the Route of Manufacture of Tablet Dosage Forms

ABSTRACT

Analytical methods for determining the manufacturing process of tablet dosage forms have not been previously reported. The use of surface analysis techniques in particular X-ray Photoelectron Spectroscopy and Time of Flight Secondary Ionization Mass Spectrometry will be described and a model proposed which allows the prediction of the route of manufacture in calcium phosphate and cellulosic-based tablet formulations. Results of the application of this model to evaluate prototype tablet formulations prepared by wet granulation or direct compression will be reported. Strengths and limitations of the model will be discussed.