Prediction of clad angle in laser cladding by powder using response surface methodology and scatter search

Currently, laser cladding is an important process that allows the deposition of thick protective coatings on substrates. The article presents an experimental investigation of the influence of processing parameters on clad angle in laser cladding by powder (LCP). The clad angle is determined from the mathematical expression relating to the clad height and clad width. The cladding angle model was developed in terms of laser power, scanning speed, and powder mass flow rate by means of response surface methodology. A first-order equation covering a narrow range of the variables and a second-order equation covering a wide range of the variables are presented. An optimization technique, Scatter Search, is used to determine optimal processing parameters. The adequacy of the predictive model was tested by analysis of variance and found to be adequate.     

Computing Arithmetic Functions Using Immobilised Enzymatic Reaction Networks

Living systems use enzymatic reaction networks to process biochemical information and make decisions in response to external or internal stimuli. Herein, we present a modular and reusable platform for molecular information processing using enzymes immobilised in hydrogel beads and compartmentalised in a continuous stirred tank reactor. We demonstrate how this setup allows us to perform simple arithmetic operations, such as addition, subtraction and multiplication, using various concentrations of substrates or inhibitors as inputs and the production of a fluorescent molecule as the readout.     

Scheduling problems with random processing times under expected earliness/tardiness costs

This work is concerned with scheduling problems for a single machine. Taking earliness and tardiness of completion time and due–date value into consideration, the objective function with a common due date is considered. The processing time of each job is random. Sufficient conditions guaranteeing an optimal SEPT sequence are derived. Under exponential and normal processing times, further results are obtained     

图像处理和识别在制衣行业中的应用及研究

以图像处理和识别技术处理、识别拟缝制的花样图案,可以实现制衣的自动打版工作。该技术主要通过将处理和识别得到的花样图案的外边缘转化为打版工作需要的基本图形（如直线、曲线）,简化复杂版式的设计工作。     

SRB轴承加工工艺探析

轴承是机械行业中的重要零件,中国轴承行业的发展速度较快,但与世界轴承工业强国相比,中国还存在较大差距,其主要表现为高精度、高技术含量和高附加值产品比例偏低、产品稳定性差、可靠性低、寿命短。反映在市场上,就是对高品质轴承的需求要靠进口来满足。以某品牌的SRB轴承产品为例,介绍SRB轴承的加工工艺。     

Perfluoropolyether–tetrafluoroethylene (PFPE–TFE) block copolymers: An innovative family of fluorinated materials

A new technological platform, based on the chemistry of the peroxidic perfluoropolyethers, has been recently developed for the synthesis of innovative fluorinated materials. Perfluoropolyether–tetrafluorethylene (PFPE–TFE) copolymers are one of the most representative examples of the potential and the flexibility of this technology. By tuning the reaction parameters, the structure of these copolymers can be easily modulated to obtain products with the desired chemical–physical and rheological properties. Applications are endless, from thin film lubrication to gel based greases, to additives for plastics, rubber and other compounds. This technology will lead to entirely new classes of PFPE materials that will fill many of the gaps existing today in markets not currently served by PFPEs.     

Chemical differentiation of volatile compounds in crude and processed Atractylodis Macrocephalae Rhizoma by using comprehensive two‐dimensional gas chromatography with time‐of‐flight mass spectrometry combined with multivariate data analysis

In the present study, comprehensive 2D GC—TOF‐MS combined with multivariate data analysis was applied to analyze the differences of the volatile components in crude and processed Atractylodis Macrocephalae Rhizoma (AMR) samples. As a result, 26 compounds that were found in crude AMR samples disappeared in processed AMR samples, and 19 compounds were newly generated and identified in AMR after processing with wheat bran. Meanwhile, principal component analysis demonstrated that there were significant chemical differences between crude and processed AMR samples, and processing procedure caused obvious quantitative and qualitative changes of volatile components in AMR. The established method could be used to explain the chemical differentiation between crude and processed AMR, and to further understand the processing mechanism of herbal medicines.     

《数字信号处理》研究性课程建设与探索

根据《数字信号处理》课程理论抽象、应用复杂等特点,提出了《数字信号处理》研究性课程建设的基本思路,介绍了具体做法,内容涉及了课堂教学、实验、探究式学习及考试方法等各个教学环节。     

强噪声海量物联网数据处理中节点选择算法研究

当前节点选择算法在强噪声干扰下,通过优先级理论实现节点选择,存在安全性差、能耗高、整体性能低下的弊端,为此,提出一种新的强噪声海量物联网数据处理中节点选择算法。将数字序列中某点的值用与该点相邻的各点值的中值替换,通过中值滤波法对物联网中的强噪声进行去除,完成强噪声干扰去除后。通过基于后悔函数的平衡剩余能量节点选择算法对海量物联网数据处理中节点进行选择。依据误码率选择满足要求的节点作为候选节点,通过减少无效处理增强能量性能。利用后悔函数对节点相对物联网的剩余能量进行估算,依据节点相对于其他节点的剩余能量确定延迟时间,从而实现节点选择。实验结果表明,采用所提算法对海量物联网数据处理中节点进行选择,不仅安全性高,而且节能性好、整体性能高。     

蒙药马钱子的炮制与毒理研究进展

马钱子是蒙医常用药之一,马钱子的治疗量与中毒剂量较接近.近年来临床应用中,中毒及毒副作用的报道也很多.本文综述马钱子的炮制减毒机理（原理、化学成分变化）、炮制工艺研究、毒理学研究等方面,为马钱子的炮制方法、炮制后的药理毒理及安全性监控标准的研究提供了综述文献.