Designing Software to Analyze Sewing Process of Industrial Knitted Products

In the textile industry,garment manufacturing contains four major pro-cesses containing cutting,sewing,finishing,and packaging.Sewing is the most crucial and intricate section,dealing with a large number of varied operations.A successful sewing process needs to be optimized regarding different factors,including time,sewing equipment,and skilled workers.Assembly lineflow is combined by a set of operations with a particular sequence.The utmost impor-tance of all garment industry is to arrange the workstations to minimize the num-ber of employees in order to produce at the best productive rate with the most reasonable cost,shortest time,and satisfying quality.In most garment factories,the production lines are balanced using the empirical judgment of the line man-agers.For the whole process the data of production time at each step,labor pro-ductivity,proper choices of equipment were always needed to calculate line efficiency.As far as the issue is concerned,there has not been an academically sewing process analyzing software providing adequate data of sewing motions and sewing time as the credible input for the line balancing tasks.Towards this goal,this paper presents the results of research on optimizing academically self-built software to analyze the sewing process of knitted products applied to industrial production using Java programming language on Google tools.The results achieved by the software are not only to analyze sewing products and the technological sewing process,calculate the sewing time on the machine but also analyze the sewing activities of workers into manipulations,movements,and motions to calculate the preparation time for two typical knitted products,namely,Polo-Shirt and T-Shirt with the case studies at General Textile Garment Joint Stock Company Hanoi and Star Fashion Company Limited.

THE DATA PROCESSING TECHNIQUE FOR INTEGRATED-OPTICS ACOUSTO-OPTIC RF SPECTRUM ANALYZER

The system of Integrated-Optics Acousto-Optic RF Spectrum Analyzer (IOAOSA)consists of a laser diode, an Acousto-Optic (A-O) modulator, geodesic lenses and CCD detectorarray. The optical signal projected on the CCD array is converted into electrical signal andprocessed by the signal processing center which consists of a TMS 32010 system and an IBM-PC.The TMS 32010 with very high speed is used in a microcomputer system. A cycle sample methodis adopted to collect the data of the CCD video signal, sampling one per 40-point. After theprocessing, the frequency bandwidth, the resolution and the dynamic range of the system aremeasured to be 100 MHz, 8 MHz and 20 dB, respectively.

Application of Dynamic Linear Detecting Method in Data Processing of the Portable Blood Sugar Analyzer

In this paper,a dynamic linear detecting method,that the non-linear coefficient NL% was led and the non-linearity of data were estimated continuously and dynamically and determined when NL% exceeded reference value (5%),was used for data processing and could solve the problem caused by the phenomenon of substrate depleting occurred following the redox reaction in portable blood sugar analyzer.By contrast to the conventional end-point method,the dynamic linear detecting method is based on multipoint data collecting.Experiments of measuring the calibration glucose solution with 8 various concentrations from 50 mg/dl to 400 mg/dl were carried out with the analyzer developed by our group.The linear regression curve,whose correlation for the data was 0.9995 and the residual was 2.8080,were obtained.The obtained correlation,residual, and the computation workload are all fit for the portable blood sugar analyzer.

Design and Construction of a Digital Multichannel Analyzer for HPGe Detector Using Digital Signal Processing Technique

The outstanding advantage of digital signal processing (DSP) techniques and Field Programmable Gate Array (FPGA) technology is capable of improving the quality of the experimental measurements for nuclear radiation. In this article, a compact DMCA 8 K was designed and manufactured using DSP technique based on FPGA technology. In particular, the output of the preamplifier is completely processed by digital techniques which are obtained from the analog-to-digital converter (ADC) to calculate the baseline, DC offset, energy peaks, pile up, threshold discrimination and then the form of energy spectrum. The Spartan-6 board is used as a hardware for the development of the digital multichannel analyzer (DMCA), which is equipped with the 14-bit AD6645 with 62.5 Msps sample rate. The application software for instrument control, data acquisition and data processing was written under C++ builder via the RS-232 interface. The designed DMCA system has been tested with a HPGe detector using gamma sources of 60Co and 137Cs and a reference pulser.

A Computer-aided Design System for Framed-mould in Autoclave Processing

The general computer-aided design （CAD） software cannot meet the mould design requirement of the autoclave process for composites, because many parameters such as temperature and pressure should be considered in the mould design process, in addition to the material and geometry of the part. A framed-mould computer-aided design system （FMCAD） used in the autoclave moulding process is proposed in this paper. A function model of the software is presented, in which influence factors such as part structure, mould structure, and process parameters are considered; a design model of the software is established using object oriented （O-O） technology to integrate the stiffness calculation, temperature field calculation, and deformation field calculation of mould in the design, and in the design model, a hybrid model of mould based on calculation feature and form feature is presented to support those calculations. A prototype system is developed, in which a mould design process wizard is built to integrate the input information, calculation, analysis, data storage, display, and design results of mould design. Finally, three design examples are used to verify the prototype.

果品挥发性风味物质的研究进展

水果是居民膳食的重要组成部分,挥发性风味物质是评价果实品质的重要指标之一,对果实的整体风味和消费者的接受程度都有很大的影响。研究水果中挥发性风味物质的组成和含量,对于鲜果贮藏及其加工市场都具有重要意义。该文介绍水果中挥发性风味物质的常用提取方法与分析技术,总结水果在贮藏和加工过程中挥发性风味物质的变化,并对未来水果挥发性风味物质的研究方向进行展望。

基于在线品位数据的铅锌选矿生产优化方法

在有色金属浮选生产过程中,自动化、智能化技术手段的应用已成为不可或缺的关键环节,准确、及时地获取浮选流程中不同节点的目标矿物品位是实现泡沫浮选过程实时高效控制的前提。某铅锌矿石复杂多金属的综合回收是一种典型的多目标优化问题,针对问题提出一种基于在线品位数据的铅锌选矿生产优化方法。首先,在深入研究矿石矿物组成的基础上,结合多年的生产数据,分析金属元素品位与金属回收率之间的关系,重点分析金、银回收率与铅锌等可被在线检测元素之间的分布规律,明确多金属回收优化问题描述以及在线品位分析仪实时检测的重要性,确定了实现多金属综合回收最优的控制方向。然后,通过利用X荧光在线品位分析系统实时获取关键工艺点主要元素铅和锌的品位数据,实时判断工况变化和变化趋势,同时,计算当前品位与目标品位累计偏差,选择不同的浮选优化控制策略。最后,设计一套浮选优化控制策略,基于在线分析数据及目标控制值,并结合泡沫特征观测,实现浮选过程工况识别和优化决策,直接用于指导生产操作。工业生产实践表明,优化方法投入使用后铅、锌精矿回收率都有所提高,铅精矿、锌精矿中金和银的回收率提升最为显著,大幅度提高了选厂浮选生产技术指标和经济指标。研究结果可为同类多金属铅锌选矿生产提供了一种新的技术优化思路和方法,也为投用浮选智能优化自动控制提供了基础数据。

RTO装置火焰温度型分析仪日常维护探讨

针对部分化工企业RTO装置因未在废气收集管道上设置在线分析仪或其维护保养不当而造成生产安全事故的问题,以污水处理含烃废气提标改造项目为例,介绍了RTO装置工艺处理流程,阐述了在线分析仪的选择、火焰温度型分析仪(FTA)启用、零点和量程标定方法及日常维护保养的重点注意事项,为其他相关企业RTO装置日常维护保养工作提供良好借鉴。

工艺矿物学参数自动分析系统在铜矿浮选尾矿银赋存特征研究中的应用

元素赋存状态及工艺矿物学特征是决定其选矿工艺及回收指标的关键因素,对指导矿产资源高效综合回收利用有重要意义。由于银矿物种类繁多且含量低、粒度细小不易识别,传统人为鉴别目标矿物并统计工艺矿物学参数的方法在银的赋存特征研究方面存在局限性,制约了资源高效综合利用。本文利用基于扫描电子显微镜(SEM)和X射线能谱仪(EDS)的工艺矿物学参数自动分析系统(BPMA)对某铜矿浮选尾矿样品(Ag 41.96μg/g,Cu 0.44%)进行矿物学分析,展示其在尾矿样品中铜和银的赋存状态及工艺矿物学特征研究中的具体应用。结果表明:样品中铜矿物主要为辉铜矿和斑铜矿;铜硫化物及其集合体的嵌布粒度细微且解离程度低,是影响铜回收的主要矿物学因素。样品中银主要以独立矿物的形式存在,(含)银矿物有自然银、辉银矿/螺状硫银矿、硒银矿、硒铜银矿、硫铜银矿和含银辉铜矿,银在各(含)银矿物中的分布率分别为95.62%、2.07%、1.33%、0.15%、0.80%和0.03%;银矿物嵌布粒度不均匀,粗粒(>74μm)、中粒(74~37μm)、细粒(37~10μm)、微粒(<10μm)银矿物的占有率分别为32.25%、30.35%、21.44%和15.95%;银矿物的解离程度较高,单体含量高达88.28%,可采用浮选法与铜硫化物一起回收。该研究为提高资源的选矿回收率提供了矿物学依据,同时采用的BPMA&SEM-EDS分析方法为矿物种类复杂、含量低、粒度细小的稀贵金属元素赋存状态及工艺矿物学研究提供了一种技术借鉴。

助熔剂对钢铁中碳含量测定的影响探究

通过实验优化了CS-444(HF-400)的测试过程,分别探讨了助熔剂用量、助熔剂种类及助熔剂样品的放置情况对钢铁中碳含量测试的影响。结果表明,助熔剂为钨铁混合助熔剂,组成为1.2 g钨粒+0.5 g铁,采用助熔剂与样品均匀混合的放置条件,得出的结果准确性和重复性满足要求。由此可得出结论,在相同的测试条件下,样品的燃烧反应完全,测试结果准确、经济、合理,并且可以为钢铁中相关碳含量的测试过程提供参考。

硫酸转化工序气体分析仪系统的设计及应用

气体分析仪系统在硫酸转化工序中起到监控进入转化器之前的烟气成分的作用,对烟气内的二氧化硫气体、氧气浓度进行监控与分析,确保其初始浓度值符合标准要求,具备合理氧硫比,保证二氧化硫的平衡转化率。本次对硫酸转化工序的气体分析仪系统进行研究,目的是根据硫酸转化系统的运行需求,进一步优化设计气体分析仪系统框架,丰富系统功能,增加智能化监控模块,提高气体分析仪系统运行高效性、敏感性与精准性。本文简要分析了硫酸转化工序的气体分析需求,阐述了硫酸转化工序气体分析仪原理,对硫酸转化工序气体分析仪系统进行了设计与应用。

多回输电线路共用通道的运行风险研究

多回输电线路共用通道发生故障时需要考虑整个通道N-1对电网带来的冲击及影响,本文对不同线路故障引起的多回输电线路共用通道N-1引起的电网故障运行风险进行研究,对电网各项工程实施前后不同网架下的同一处多回输电线路共用通道各种组合进行分析和总结,并针对当前项目中存在的问题和不足提出相关建议。

质谱仪离子源和质谱仪质量分析器的生产制造工艺

质谱仪离子源和质谱仪质量分析器能够将化学样品分析为其组成部分的离子,并根据其质量-电荷比进行分离和检测,是许多关键领域不可或缺的分析工具。剖析质谱仪离子源和质谱仪质量分析器的生产制造工艺,通过解决当前面临的技术难题、改进工艺流程以及推动新技术的创新发展,以有效提高质谱仪离子源和质谱仪质量分析器的制造质量和性能,为相关领域的科学研究和应用提供更加可靠和先进的分析工具。

环氧砂浆的三种非过流面耐磨性测试方法适用性分析

阐述了现有的非过流面耐磨性测试方法对环氧砂浆不适用的原因。通过调整三种测试方法的参数,绘制相应的磨损量-磨损时间(转数)曲线图,结合机械磨损理论的磨损过程图,分析三种非过流面耐磨性测试方法对环氧砂浆的适用性。最后,对三种非过流面耐磨性测试方法做出调整并进行适用性评价。

Structures and Properties of Iron Matrix Composites with Tungsten Carbide Particle by EPC-V Process

In this paper the Expendable Pattern Casting with dry sand Vacuum(EPC-V) process is used to manufacture iron matrix composites with tungsten carbide particle.Microstructures of the composites layers were analyzed.The abrasive wear resistance of the composites layers were tested and compared with that of high chromium cast iron.The results show that the iron matrix composites with tungsten carbide particle have high hardness.The abrasive wear resistance of composites with tungsten carbide particle is higher than that of high chromium cast iron.The properties of the matrix materials have been improved remarkably.

A new green process for biodiesel production from waste oils via catalytic distillation using a solid acid catalyst-Modeling, economic and environmental analysis

The challenges in the chemical processing industry today are environmental concerns, energy and capital costs. Catalytic distillation(CD) is a green reactor technology which combines a catalytic reaction and separation via distillation in the same distillation column. Utilization of CD in chemical process development could result in capital and energy savings, and the reduction of greenhouse gases. The efficacy of CD and the economic merits, in terms of energy and equipment savings, brought by CD for the production of biodiesel from waste oil such as yellow grease is quantified. Process flow sheets for industrial routes for an annual production of 10 million gallon ASTM purity biodiesel in a conventional process(reactor followed by distillation) and CD configurations are modeled in Aspen Plus. Material and energy flows, as well as sized unit operation blocks, are used to conduct an economic assessment of each process. Total capital investment, total operating and utility costs are calculated for each process. The waste oil feedstock is yellow grease containing both triglyceride and free fatty acid. Both transesterification and esterification reactions are considered in the process simulations. Results show a significant advantage of CD compared to a conventional biodiesel processes due to the reduction of distillation columns, waste streams and greenhouse gas emissions. The significant savings in capital and energy costs together with the reduction of greenhouse gases demonstrate that process intensification via CD is a feasible and new green process for the biodiesel production from waste oils.

Process mineralogy and characteristic associations of iron and phosphorus-based minerals on oolitic hematite

The chemical compositions,mineralogical characteristics,as well as dissemination of iron-and phosphorus-based minerals were studied for the E’xi oolitic hematite from western Hubei Province in China by using chemical analysis,optical microscope,electron probe micro-analyzer(EPMA)and energy dispersive spectroscopy(EDS).It is found that this kind of oolitic hematite ore contains 47.71%TFe,10.96%SiO_2,as well as 0.874%P,with hematite as the dominant Fe-bearing minerals,and quartz,chamosite,illite and cellophane as main gangue minerals.The microscope examination showed that the ore has an oolitic structure,with some ooids principally formed by a series of concentric layers of hematite collophanite around nucleus that is hematite in the association with collophanite.Based on the EPMA and EDS analysis,it can be known that some ooids are primarily composed of hematite and collophanite.The separation can be achieved through fine grinding for those collophanite laminae with a higher P content.However,the dissemination of two minerals at the interface will result in the difficulty in effective separation.Besides,some ooids are made of chamosite with some nucleus formed of quartz,which is principally finely disseminated with hematite.In view of the close association and dissemination of iron-and phosphorus-based minerals in the ooids,it is found that the process of stage-grindings and stage-separations can be adopted to effectively increase the iron recovery and decrease the P content in the concentrate to some extent.

Recent Progress of Commercially Available Biosensors in China and Their Applications in Fermentation Processes

Biosensors, which are the products of the biotechnology industry, are among the key projects of the 7th, 8th, and 9th Fiveyear Plans of China Science ＆ Technology Developing Programs, respectively, and they play an important role in developing and reforming traditional biotechnology. SBA series biosensor analyzer, as the only one commercial biosensor in China, has attracted lots of attention in the process of information gathering and measurement for biological industry with the development of technology and society. In this paper, we presented an overview of the most important contributions dealing with the monitoring of the biochemical analytes in fermentation processes using SBA series biosensor analyzers in China. Future trends of the biosensor analyzer in China were also mentioned in the last section.

Aspen Energy Analyzer在化工过程分析与合成课程教学中的应用

化工过程分析与合成是化工类实践性非常强的专业基础课。在过程工业中,能量是通过换热网络进行传递的,换热网络设计是此课程教学过程中的重要内容之一。本文应用夹点技术,采用Aspen Energy Analyzer软件对简单的换热网络进行分析、综合和优化,使学生更加容易理解和掌握夹点的基础理论,同时使学生熟悉该软件的使用,为后续化工设计和毕业设计的相关换热网络研究打下基础,也可为日后的科研开发、工程设计和生产管理提供了一种有力的技术手段。

Modeling of Economic Processes, Instability and Chaos

We consider a mathematical model describing the dynamics of the three components of the economic activity of enterprises—production, management and resource consumption. For the analysis of the dynamics, the methods and criteria formulated by the authors earlier were used;new results of a practical nature were obtained;in particular, the calculation of the spectrum of small perturbations of the system depending on the input resource and system parameters is given. It is shown that the calculated values of the criteria of instability and chaos are fully consistent with the calculation of the spectrum, indicated the stability intervals of the system, as well as areas of instability and chaos.