Computer simulation of two-dimensional electrolyte flow in electrochemical machining

A mathematical model and a method for numerical modeling of two-dimensional electrolyte flow in the interelectrode gap during electrochemical machining (ECM) are presented. Programs for modeling electrolyte flow and observing the distribution of ECM parameters are designed. The modeling results are compared with experimental data on continuous ECM and ECM with a vibrating tool.Translated from Elektrokhimiya, Vol. 41, No. 1, 2005, pp. 102–110.Original Russian Text Copyright © 2005 by Dabrowski, Paczkowski.     

OriC-ENS: A sequence-based ensemble classifier for predicting origin of replication in S. cerevisiae

DNA Replication plays the most crucial part in biological inheritance, ensuring an even flow of genetic information from parent to offspring. The beginning site of DNA Replication which is called the Origin of Replication (ORI), plays a significant role in understanding the molecular mechanisms and genomic analysis of DNA. Hence, it is paramount to accurately identify the origin of replication to gain a more accurate understanding of the biochemical and genomic properties of DNA. In this paper, We have proposed a new approach named OriC-ENS that uses sequence-based feature extraction techniques, K-mer, K-gapped Mono-Di, and Di Mono, and an ensemble classification technique that uses majority voting for the identification of Origin of Replication. We have used three SVM classifiers, one for the K-mer features and two more for K-Gapped Mono-Di and K-Gapped Di-mono features. Finally, we used majority voting to combine the prediction by each predictor. Experimental results on the S. Cerevisiae dataset have shown that our method achieves an accuracy of 91.62 % which outperforms other state-of-the-art methods by a significant margin. We have also tested our method using other evaluation metrics such as Matthews Correlation Coefficient (MCC), Area Under Curve(AUC), Sensitivity, and Specificity, where it has achieved a score of 0.83, 0.98, 0.90, and 0.92 respectively. We have further evaluated our model on an independent test set collected from OriDB, consisting of the sequences of Schizosaccharomyces pombe where we have seen that our model can predict the origin of replication efficiently and with great precision. We have made our python-based source code available at https://github.com/MehediAzim/OriC-ENS.     

振动工具传至手臂系统的能量

振动白指病(VWF)是手持振动工具操作工人的职业病,其发病率决定于从工具传入手中的总能量水平。本文介绍了传入手中的能量的计算方法,并结合对操作工人的实测结果加以比较。结论指出,在6.3～1000Hz范围以内,由风镐手柄传入手中的单位时间的功为1.57×10~2J·S~(-1),而由风镐凿子传入手中的单位时间的功则更多。     

一种新的机床模块化设计编码方法

从模块化设计的目的出发，提出模块化设计应侧重功能与组合两个方面，而机床功能在模块上体现为模块的特性参数。因此，模块的编码应当引入上述两个方面内容。整个设计通过采用人机交互方式，拼装模块组合机床；通过借助计算机，自动匹配模块来实现。此外，还可以作进一步的后续处理。     

CAXA制造工程师2004在数控加工中的应用

本文介绍了如何应用CAXA制造工程师2004软件进行异型零件的复杂曲面的加工，以便实现零件白勺设计、工艺分析和加工一体化，从而提高零件复杂曲面的表面质量。     

城市道路交通发展规划的数学模型

指出城市道路交通拥堵的原因 .确立城市交通中诸关键因素之间相互关系的数学模型     

计算机控制光学表面抛光的磨头运动方式和参数的优化研究

对影响计算机数控抛光表面误差收敛速度的主要因素———磨头工作函数进行了详细的讨论。提出了以趋近因子作为评价磨头参数优化的参量。对目前流行的行星式磨头和平转动磨头分别作优化,给出了最佳参数组合,为提高计算机控制抛光的效率提供了理论依据。     

推拉并行模式的生产优化研究

本文提出一种推拉并行的生产模式 ,并分析了其优点 .该模式规定设备在完成普通订单的空闲时间补充库存但不许超过库房容量 ;如果加急订单到达时的库存量大于 0 ,则直接交货 ,并收取附加费用 ,否则与普通订单一道排队 .文章一方面给出了各种参数下加急订单的利润平衡点 ,另一方面展示出随着库存容量的增加 ,普通订单的交货时间接近于加急订单不存在时的数值 .     

Stability of Fluid Networks with Proportional Routing

In this paper we investigate the stability of a class of two-station multiclass fluid networks with proportional routing. We obtain explicit necessary and sufficient conditions for the global stability of such networks. By virtue of a stability theorem of Dai [14], these results also give sufficient conditions for the stability of a class of related multiclass queueing networks. Our study extends the results of Dai and VandeVate [19], who provided a similar analysis for fluid models without proportional routing, which arise from queueing networks with deterministic routing. The models we investigate include fluid models which arise from a large class of two-station queueing networks with probabilistic routing. The stability conditions derived turn out to have an appealing intuitive interpretation in terms of virtual stations and push-starts which were introduced in earlier work on multiclass networks.