嵌入式系统在高速织机控制中的应用

为了提高织机控制系统的性能及可持续发展,通过对国内外高速织机控制系统的现状分析,提出了一种新的控制方式———将嵌入式系统应用于高速织机控制系统。给出了织机控制平台示意图,并对其硬件的关键部分(嵌入式处理器的控制接口部分)和软件实现方式进行了说明。该平台利用ARM嵌入式处理器S3C4510B的丰富硬件资源和嵌入式操作系统μCLinux的高实时、多任务等优点,实现了高速织机控制系统的智能化、网络化和柔性化。     

高性能织机控制系统中USB接口的设计

为改善原有织机控制系统在提综信息存储方式上的不足,通过对目前各种数据存储器的比较分析,提出了一种基于USB的存储方式。简单介绍了织机控制系统和USB模块的硬件设计,给出了控制系统的示意图以及USB模块的硬件连接图,具体阐述了USB主机系统的软件设计,包括SL811HS初始化、USB设备枚举、Mass Storage协议和FAT文件系统4个部分。该设计充分利用了原有控制系统ARM嵌入式处理器S3C4510B的丰富资源,并结合USB主芯片SL811HS的自身特点,实现了织机控制系统的USB接口。     

基于ARM和μClinux的经纱张力控制嵌入式系统设计

为提高织机速度和织物质量,利用ARM嵌入式处理器S3C44B0X的丰富硬件资源和嵌入式操作系统μClinux的高实时、多任务等优点,设计了一种用较低成本完成所需控制功能的经纱张力嵌入式系统。从系统硬件架构设计与实现、应用程序设计与实现等方面介绍了整个系统,同时研究了张力的控制策略。系统能使控制的经纱张力恒定,反应快速,控制精度高,也很好地解决了开车痕等问题。结果表明,开发的系统性能优越,解决了一些控制难点。     

基于S3C4510B的家庭网关基本系统

介绍了家庭网关的基本框架和信息流程,S3C4510B的体系结构和内部资源.并根据所选用uCLinux操作系统对系统的要求,提出了一种家庭网关的硬件基本系统设计方案,以及在该硬件系统上,uCLinux操作系统运行前的启动代码.     

基于uClinux的数据采集系统的设计与实现

介绍了一种基于uClinux的嵌入式系统在数据采集方面的应用,构建了以微处理器S3C44B0X为控制核心的数据采集系统.该系统可以很好地取代传统的单片机系统,具有数据采集、预处理等功能,并支持远端用户通过Web浏览器的访问与监测.     

基于ARM-Linux的温湿度远程监控系统设计

基于ARM_Linux的环境温湿度远程监控系统设计以三星公司生产的ARM9内核S3C2440A作为主控制器,数字温湿度传感器以AM2303作为检测元件。在ARM芯片中移植嵌入式Linux操作系统。并在Linux下编写基于AM2303温湿度传感器的驱动程序。在嵌入式系统中集成嵌入式Web服务器,编写CGI程序。在远程监控PC端,通过浏览网页的方式可以查看目标环境的温湿度变化情况,系统小巧轻便、易于安装,可用于智能家居、库房等各种需要对温湿度参数信息进行远程监控的场合,具有一定的应用价值。     

基于嵌入式的稻米形态特性分析仪的开发

设计了一套基于嵌入式的稻米形态特性分析仪,针对优质稻米品质参数检测的实际需要,在设计稻米图像采集装置的基础上,系统以基于ARM内核的S3C2410平台为硬件开发环境,利用嵌入式Linux系统,通过USB图像驱动程序移植,实现了对稻米图像的采集及保存过程,在此基础上,结合图像处理与模式识别技术,编写相应的图像分析应用程序,获得稻米形态品质的国标参数,实现了对稻米整精米率、垩白粒率、垩白度、粒型的快速无损检测。     

基于SIP的嵌入式手持终端的设计与实现

将嵌入式技术与SIP技术相结合,采用模块化的设计思想,实现了基于S3C2440的嵌入式手持终端的设计.仿真结果表明,该设计在Linux系统中实现了SIP协议栈的移植,手持终端运行良好,符合SIP通话流程,满足设计需求.     

基于S3C2440与OV9650的嵌入式监控设计

嵌入式视频监控具有小巧灵活、可靠性高、组网方便、可远程监控等优点,可满足当前社会日益增长的安保需求。文章以三星公司的S3C2440处理器和Omni Vision公司OV9650图像传感器为硬件平台,以嵌入式Linux为软件平台,设计具有视频采集和编码功能的嵌入式监控系统,并采用经过优化后的XVID编码器进行编码,在达到高压缩比的情况下保证图像质量,适合银行、小区门禁、仓库等无人值守场合。     

嵌入式Web服务器的设计及其CGI实现

基于Boa和CGI技术建立Web服务器的理念,可以解决远程访问、控制和监测嵌入式设备的问题。Web服务器的硬件核心是S3C2410处理器,操作系统为ARMLinux,在整体设计方案进行论证的基础上,将嵌入式Web服务器设计在其中,阐述了系统的硬件结构构成,重点分析嵌入式Web服务器的设计理念和CGI的实现及应用扩展,最后对嵌入式Web服务器运行并测试。测试结果表明,这种服务器运行速度稳定、相应较快、控制方便,到了预期应用效果。     

Textural Properties of Cold-set Gels Induced from Heat-denatured Whey Protein Isolates

A 9% whey protein (WP) isolate solution at pH 7.0 was heat-denatured at 80°C for 30 min. Size-exclusion HPLC showed that native WP formed soluble aggregates after heat-treatment. Additions of CaCl2 (10–40 mM), NaCl (50–400 mM) or glucono-delta-lactone (GDL, 0.4–2.0%, w/v) or hydrolysis by a protease from Bacillus licheniformis caused gelation of the denatured solution at 45°C. Textural parameters, hardness, adhesiveness, and cohesiveness of the gels so formed changed markedly with concentration of added salts or pH by added GDL. Maximum gel hardness occurred at 200 mM NaCl or pH 4.7. Increasing CaCl2 concentration continuously increased gel hardness. Generally, GDL-induced gels were harder than salt-induced gels, and much harder than the protease-induced gel.     

Occurrence of bisphenol-F-diglycidyl ether (BFDGE) in fish canned in oil

The levels of bisphenol-F-diglycidyl ether (BFDGE) were quantified as part of a European survey on the migration of residues of epoxy resins into oil from canned fish. The contents of BFDGE in cans, lids and fish collected from all 15 Member States of the European Union and Switzerland were analysed in 382 samples. Cans and lids were separately extracted with acetonitrile. The extraction from fish was carried out with hexane followed by re-extraction with acetonitrile. The analysis was performed by reverse phase HPL C with fluorescence detection. BFDGE could be detected in 12% of the fish, 24% of the cans and 18% of the lids. Only 3% of the fish contained BFDGE in concentrations considerably above 1mg/kg. In addition to the presented data, a comparison was made with the levels of BADGE (bisphenol-A-diglycidyl ether)analysed in the same products in the context of a previous study.     

Contribution of European research to risk analysis

The European Commission's, Quality of Life Research Programme, Key Action 1—Health, Food & Nutrition is mission-oriented and aims, amongst other things, at providing a healthy, safe and high-quality food supply leading to reinforced consumer confidence in the safety of European food. Its objectives also include the enhancing of the competitiveness of the European food supply. Key Action 1 is currently supporting a number of different types of European collaborative projects in the area of risk analysis. The objectives of these projects range from the development and validation of prevention strategies including the reduction of consumers risks; development and validation of new modelling approaches; harmonization of risk assessment principles, methodologies, and terminology; standardization of methods and systems used for the safety evaluation of transgenic food; providing of tools for the evaluation of human viral contamination of shellfish and quality control; new methodologies for assessing the potential of unintended effects of genetically modified (genetically modified) foods; development of a risk assessment model for Cryptosporidium parvum related to the food and water industries; to the development of a communication platform for genetically modified organism, producers, retailers, regulatory authorities and consumer groups to improve safety assessment procedures, risk management strategies and risk communication; development and validation of new methods for safety testing of transgenic food; evaluation of the safety and efficacy of iron supplementation in pregnant women; evaluation of the potential cancer-preventing activity of pro- and pre-biotic ('synbiotic') combinations in human volunteers. An overview of these projects is presented here.     

低温带皮菜籽粕微粉的不同粒级部分的功能特性

为研究低温带皮菜籽粕微粉的不同粒级部分的功能特性,以经低温脱脂的带皮菜籽粕为原料,经微粉碎后筛分成212~425μm、150~212μm和106~150μm的3个不同粒级的微粉样品,检测这些样品的吸水性、吸油性、乳化性和乳化稳定性、蛋白质体外消化率。结果表明:1 3个不同粒级的微粉样品之间的粗纤维含量存在显著差异,表明三者的结构组成成分有一定差异。23个微粉样品的乳化活性和乳化稳定性随粒度级别的减小而显著增加(P0.01)。33个微粉样品的蛋白质体外消化率随粒度级别的减小而显著增加(P0.01)。4不同粒级带皮菜籽粕微粉样品的吸水性与吸油性受其结构组成物质不同和粒度的双重影响,与粒度的相关性不明显。     

Microbiology of food taints

Fresh and processed foods are often spoilt by the presence of undesirable flavours and odours caused by microbial action. The aim of this paper is to review the current knowledge of microbiologically induced taints that occur in a wide range of foodstuffs, including meats, poultry, fish, crustaceans, milk, dairy products, fruits, vegetables, cereals and cereal products. Examples have been chosen where the compounds responsible for the taint have been identified and sufficient data obtained to demonstrate the involvement of microorganisms. However, in some cases the full identity of the causative organism may not have been elucidated. The types of microorganisms covered by this review include bacteria, fungi, yeasts, actinomycetes and cyanobacteria. Although cyanobacteria do not in general infect foods, their presence in aqueous systems and water supplies can lead to off-flavours in aquatic organisms and processed foodstuffs. Several examples of each of these processes are discussed. Wherever possible, the likely biosynthetic pathway used by the microorganism to produce the offending compound in a foodstuff is indicated.     

Analysis for organic residues from aids to polymerization used to make plastics intended for food contact

Polymers intended for food contact use have been analysed for organic residues which could be attributed to a range of substances employed as polymerization aids (e.g. initiators and catalysts). A wide range of polymers was extracted with solvents and the extracts analysed by gas chromatography-mass spectrometry (GC-MS). The overwhelming majority of substances identified were not derived from aids to polymerization but were oligomers, additives and adventitious contaminants. However, a small number of substances were identified as initiator residues. These included tetramethylsuccinonitrile (TMSN) which was observed in two polymers and it derived from recombination of two azobisisobutyronitrile (AIBN) initiator radicals. Methyl benzoate, benzoic acid, biphenyl and phenyl benzoate were detected in one poly(methyl methacrylate) sample and in two polyvinylchlorides and they are thought to be derived from benzoyl peroxide initiator. TMSN was subsequently targeted for analysis of poly-(methyl methacrylate) plastics using proton nuclear magnetic resonance spectrometry (¹     

Tests of potential functional barriers for laminated multilayer food packages. Part II: Medium molecular weight permeants

Experiments were performed to characterize the kinetics of the permeation of different medium molecular weight model permeants: bisphenol A, warfarin and anthracene, from liquid paraffin, through a surrogate potential functional barrier (25 microns-thick orientated polypropylene--OPP) into the food simulants olive oil and 3% (w/v) acetic acid. The characterization of permeation kinetics generally observed the permeation models previously reported to explain the experimental permeation results obtained for a low molecular weight group of model permeants. In general, the model permeants exhibited behaviour consistent with their relative molecular weights with respect to (a) the time taken to attain steady-state permeation into the food simulant in which they were more soluble, (b) their subsequent steady-state permeation rates, and (c) their partition between liquid paraffin and the OPP membrane.     

The development of reference materials for paralytic shellfish poisoning toxins in lyophilized mussel. I: Interlaboratory studies of methods of analysis

This paper describes the first part of a project undertaken to develop mussel reference materials for Paralytic Shellfish Poisoning (PSP) toxins. Two interlaboratory studies were undertaken to investigate the performance of the analytical methodology for several PSP toxins, in particular saxitoxin (STX) and decarbamoyl-saxitoxin (dc-STX) in lyophilized mussels, and to set criteria for the acceptance of results to be applied during the second part of the project: the certification exercise. In the first study, 18 laboratories were asked to measure STX and dc-STX in rehydrated lyophilized mussel material and to identify as many other PSP toxins as possible with a method of their choice. In the second interlaboratory study, 15 laboratories were additionally asked to determine quantitatively STX and dc-STX in rehydrated lyophilized mussel and in a saxitoxin-enriched mussel material. The first study revealed that three out of four postcolumn derivatization methods and one pre-column derivatization method sufficed in principle to determine STX and dc-STX. Most participants (13 of 18) obtained acceptable calibration curves and recoveries. Saxitoxin was hardly detected in the rehydrated lyophilized mussels and results obtained for dc-STX yielded a CV of 58% at a mass fraction of 1.86 mg/kg. Most participants (14 out of 18) identified gonyautoxin-5 (GTX-5) in a hydrolysed extract provided. The first study led to provisional criteria for linearity, recovery and separation. The second study revealed that 6 out of 15 laboratories were able to meet these criteria. Results obtained for dc-STX yielded a CV of 19% at a mass fraction of 3.49mg/kg. Results obtained for STX in the saxitoxin-enriched material yielded a CV of 19% at a mass fraction of 0.34mg/kg. Saxitoxin could not be detected in the PSP-positive material. Hydrolysis was useful to confirm the identity of GTX5 and provided indicative information about C1 and C2 toxins in the PSP-positive material. The methods used in the second interlaboratory study showed sufficiently consistent analysis results to undertake a certification exercise to assign certified values for STX and dc-STX in lyophilized mussel.     

Focus on China's Paper Industry

In the English section of this issue, 〈China Paper Newsletters〉 will introduce ＂National Development and Reform Commission Issued Announcement for Selection of Major Preliminary Research Projects for the ＇13th Five-Year Plan＇＂, ＂2013 Annual Report of China＇s Paper Industry＂, and news of projects and other policies.     

Listen to downstream & search for innovation

正Nowadays,textile enterprises are all taking efforts in transformation and upgrading,like improving producing capacity and optimizing production structure to face market downturn.It claimed a higher request to the standard of textile equipments.In the upcoming of ITMA ASIA+CITME 2014exhibition,this magazine have interviewed several branch associations and a series of relative enterprises,to summarize industrial developing status