基于虚拟仪器的织机振动测试系统的研究

振动的检测对织机设计和改造有重要的指导意义，使用LabWindows／CVI测试软件平台，PCI-6024E多功能数据采集卡，结合性能优良的传感器，设计基于虚拟仪器的织机振动检测系统．按要求对织机进行实时测量和频谱分析。     

基于虚拟仪器的织机振动测试系统的研究

振动的检测对织机设计和改造有重要的指导意义。使用IabWindows／CVI测试软件平台，PCI-6024E多功能数据采集卡，结合性能优良的传感器，设计了基于虚拟仪器的织机振动检测系统，并按要求对织机进行了实时测量和频谱分析。     

基于虚拟仪器的织机振动测试系统的研究

振动的检测对织机设计和改造有重要的指导意义。使用LabWindows/CVI测试软件平台 ,PCI -60 2 4E多功能数据采集卡 ,结合性能优良的传感器 ,设计了基于虚拟仪器的织机振动检测系统 ,并按要求对织机进行了实时测量和频谱分析。     

剑杆织机经纱张力控制中噪声信号估计与滤波

为获得更准确的经纱张力检测信号,提高剑杆织机的控制性能指标,在分析剑杆织机经纱张力控制中噪声源及噪声特性的基础上,提出了经纱张力控制中噪声信号的分类处理原则.针对高频振动噪声和随机噪声,在定义难控度概念的基础上,分析了模拟低通滤波器设计方法.针对周期性低频振动噪声,采用频谱分析定周期和相干平均法定信号的方法,估计周期性...     

织造设备与厂房振动对生产的影响

通过分析研究出织机振动频率、幅度和厂房振动频率及幅值的计算实例及方法,介绍了振动对生产的影响和振动安全范围及预防振动的有效方法。从生产角度提出了克服振动的措施,给织厂设计提出了相关理论参考依据。     

应用新颖锥形辅助喷嘴和辅助气阀的新一代喷气织机

日本丰田自动织机公司在ATMA’96上展出了新一代JAT610型喷气织机，该织机应用了最新的锥形辅助喷咀和辅助气阀，使丰田喷气织机进入了一个新的发展阶段，其主要特点如下：1．随着新颖辅助喷咀和辅助气阀的应用，使喷气织机空气的耗量明显降低。2．重新设计了传动机构和电气部件，降低了电耗。3．应用了新颖的开口机构，使核口的几何结构更趋代化。4．应用轻薄而耐久的打纬机构，使织机更能达到高速化运转的要求。5．应用无焊接缝的整体机架，可减少织机的振动10％以上。6微电脑和触摸式显示屏的应用，使织机自动化的功能更趋完善。7从用…     

基于Windows的织机主轴振动性能分析软件开发

将传递矩阵理论应用于织机主轴系统的振动性能分析,在Windows平台下,开发了一个织机主轴振动性能分析软件。采用Visual Basic程序设计语言,在模块化基础上完成了程序流程图,设计出可以实现多个人机界面、结果可视化的专门软件,并给出了分析实例。     

喷气织机打纬机构及墙板的振动特性

针对喷气织机四连杆打纬机构随着转速的不断提高会引起的强烈振动和噪音问题,采用理论分析、数值模拟和实验相结合的方法对打纬机构及墙板的振动特性进行研究。分析四连杆打纬机构的动力学特性,基于有限元法分析四连杆打纬力对织机墙板振动的影响,建立打纬机构的曲柄旋转角度与打纬力、织机墙板最大振动应力和加速度的关系,确定织机墙板上最大振动以及最大应力产生的位置。结果表明,墙板发生共振的频率约为44?5 Hz,与喷气织机主振频率非常接近,墙板的最大振动主要集中在打纬机构附近,而最大应力主要集中在墙板中部和下部,并非墙板的最大振动处。     

剑杆织机

本届展览会共展出挠性剑杆织机33台，刚性剑杆织机2台。从参展织机数量来看，剑杆织机仍是最多的机种。西欧各国和日本展出的均属高档剑杆织机，韩国和中国包括台湾展出了各类中高档剑杆织机。一、比利时PICANOL公司的GAMMA型挠性剑杆织机该机在设计上与GTX相比有重大的结构改进，为该公司最新产品，是第一次在国际展览会上展出，属于先进的高档剑杆织机。该机主要特点：1．机身低矮，并具有一定倾斜度，档车工容易接触到织机的各个部位。机架稳固，振动小，不需要地脚螺丝，用胶水把地脚胶在地坪上就能承受600转／分的速度。2．全机…     

应用虚拟仪器技术对国产喷气织机机械性能进行测试与分析

运用虚拟仪器技术和非电量电测技术对国产Y型喷气织机和日本ZA209i型喷气织机进行测试，并进行对比分析，得出国产Y型喷气织机在纬纱飞行时间、振动、功率等方面尚不如日本ZA209i型喷气织机的结论，从而为国产喷气织机的研制生产提供出指导性的数据。     

Reliable identification of grapevine rootstock varieties using RAPD PCR on woody samples

Since grapevine ( Vitis spp .) rootstock material is being traded increasingly as disbudded woody material a lack of distinctive morphological features on such material necessitates an alternative and reliable means of identification. Methods described here were developed for rapid and efficient extraction of DNA from woody samples rich in phenolic compounds and polysaccharides, and for subsequent identification of varieties by RAPD PCR. Using these methods, and with the application of only one selected RAPD primer, we were able to differentiate sixteen rootstock varieties, including the seven varieties most commonly used in Germany. Problems commonly encountered with reproducibility of RAPD patterns were avoided by choosing primers with a dinucleotide sequence and a high G/C content that allowed a rather high annealing temperature of 45°C. Methods described here should also be useful for other horticultural crops, especially those with woody tissues rich in phenolic compounds and polysaccharides.     

An internet compendium of analytical methods and spectroscopic information for monomers and additives used in food packaging plastics

An internet website (http://cpf.jrc.it/smt/) has been produced as a means of dissemination of methods of analysis and supporting spectroscopic information on monomers and additives used for food contact materials (principally packaging). The site which is aimed primarily at assisting food control laboratories in the European Union contains analytical information on monomers, starting substances and additives used in the manufacture of plastics materials. A searchable index is provided giving PM and CAS numbers for each of 255 substances. For each substance a data sheet gives regulatory information, chemical structures, physico-chemical information and background information on the use of the substance in particular plastics, and the food packaging applications. For monomers and starting substances (155 compounds) the infra-red and mass spectra are provided, and for additives (100 compounds); additionally proton NMR are available for about 50% of the entries. Where analytical methods have been developed for determining these substances as residual amounts in plastics or as trace amounts in food simulants these methods are also on the website. All information is provided in portable document file (PDF) format which means that high quality copies can be readily printed, using freely available Adobe Acrobat Reader software. The website will in future be maintained and up-dated by the European Commission's Joint Research Centre (JRC) as new substances are authorized for use by the European Commission (DG-ENTR formerly DGIII). Where analytical laboratories (food control or other) require reference substances these can be obtained free-ofcharge from a reference collection housed at the JRC and maintained in conjunction with this website compendium.     

Aroma characterization of various apricot varieties using headspace–solid phase microextraction combined with gas chromatography–mass spectrometry and gas chromatography–olfactometry

The characterization of the aromatic profile of several apricot cultivars with molecular tracers in order to obtain objective data concerning the aromatic quality of this fruit was undertaken using headspace–solid phase microextraction (HS–SPME). Six apricot cultivars were selected according to their organoleptic characteristics: Iranien, Orangered, Goldrich, Hargrand, Rouge du Roussillon and A4025. The aromatic intensity of these varieties measured by HS–SPME–Olfactometry were defined and classified according to the presence and the intensity of grassy, fruity and apricot like notes. In the six varieties, 23 common volatile compounds were identified by HS–SPME–GC–MS. Finally, 10 compounds, ethyl acetate, hexyl acetate, limonene, β-cyclocitral, γ-decalactone, 6-methyl-5-hepten-2-one, linalool, β-ionone, menthone and (E)-hexen-2-al were recognized by HS–SPME–GC–O as responsible of the aromatic notes involved in apricot aroma and considered as molecular tracers of apricot aromatic quality which could be utilized to discriminate apricot varieties.     

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

The advent of the functional barrier concept in food packaging has brought with it a requirement for fast tests of permeation through potential barrier materials. In such tests it would be convenient for both foodstuffs and materials below the functional barrier (sub-barrier materials) to be represented by standard simulants. By means of inverse gas chromatography, liquid paraffin spiked with appropriate permeants was considered as a potential simulant of sub-barrier materials based on polypropylene (PP) or similar polyolefins. Experiments were performed to characterize the kinetics of the permeation of low molecular weight model permeants (octene, toluene and isopropanol) from liquid paraffin, through a surrogate potential functional barrier (25 μm-thick oriented PP) into the food simulants olive oil and 3% (w/v) acetic acid. These permeation results were interpreted in terms of three permeation kinetic models regarding the solubility of a particular model permeant in the post-barrier medium (i.e. the food simulant). The results obtained justify the development and evaluation of liquid sub-barrier simulants that would allow flexible yet rigorous testing of new laminated multilayer packaging materials.     

Chlorohydrins of bisphenol A diglycidyl ether (BADGE) and of bisphenol F diglycidyl ether (BFDGE) in canned foods and ready-to-drink coffees from the Japanese market

BADGE.2HCl and BFDGE.2HCl were determined in 28 samples of ready-to-drink canned coffee and 18 samples of canned vegetables (10 corn, 5 tomatoes and 3 others), all from the Japanese market. HPLC was used as the principal analytical method and GCMS for confirmation of relevant LC fractions. BADGE.2HCl was found to be present in one canned coffee and five samples of corn, BFDGE.2HCl in four samples of canned tomatoes and in one canned corn. No sample was found which exceeded the 1mg/kg limit of the EU for the BADGE chlorohydrins. However the highest concentration was found for the sum of BFDGE.2HCl and BFDGE.HCl.H₂O at a level of 1.5mg/kg. A Beilstein test confirmed that all cans containing foods contaminated with BADGE.2HCl or BFDGE.2HCl had at lest one part coated with a PVC organosol.     

European priorities for research to support legislation in the area of food contact materials and articles

A strong science base is required to underpin the planning and decision-making process involved in determining future European community legislation on materials and articles in contact with food. Significant progress has been made in the past 5 years in European funded work in this area, with many developments contributing to a much better understanding of the migration process, and better and simpler approaches to food control. In this paper this progress is reviewed against previously identified work-areas (identified in 1994) and conclusions are reached about future requirements for R&D to support legislation on food contact materials and articles over the next 5 or so years.     

Analysis of benzo[a]pyrene in spiked fatty foods by second derivative synchronous spectrofluorimetry after microwave-assisted treatment of samples

A simple, rapid and inexpensive method has been developed for the determination of benzo[a     

The development of reference materials for paralytic shellfish poisoning toxins in lyophilized mussel. II: Certification study

This paper describes the second part of a project undertaken to develop certified mussel reference materials for paralytic shellfish poisoning toxins. In the first part two interlaboratory studies were undertaken to investigate the performance of the analytical methodology for several PSP toxins, in particular saxitoxin and decarbamoyl-saxitoxin in lyophilized mussels, and to set criteria for the acceptance of results to be applied during the certification exercise. Fifteen laboratories participated in this certification study and were asked to measure saxitoxin and decarbamoyl-saxitoxin in rehydrated lyophilized mussel material and in a saxitoxin-enriched mussel material. The participants were allowed to use a method of their choice but with an extraction procedure to be strictly followed. The study included extra experiments to verify the detection limits for both saxitoxin and decarbamoyl-saxitoxin. Most participants (13 of 15) were able to meet all the criteria set for the certification study. Results for saxitoxin.2HCl yielded a certified mass fraction of <0.07 mg/kg in the rehydrated lyophilized mussels. Results obtained for decarbamoyl-saxitoxin.2HCl yielded a certified mass fraction of 1.59+/-0.20 mg/kg. The results for saxitoxin.2HCl in enriched blank mussel yielded a certified mass fraction of 0.48 +/- 0.06 mg/kg. These certified reference materials for paralytic shellfish poisoning toxins in lyophilized mussel material are the first available for laboratories to test their method for accuracy and performance.     

Announcing a new international peer-reviewed journal:Food Science and Human Wellness now accepting manuscript submission in English

<正>We are pleased to announce the launch of a new international peer-reviewed journal-Food Science and Human Wellness,ISSN 2213-4530,which is an open access journal,produced and hosted by Elsevier B.V.on behalf of Beijing Academy of Food Sciences.Food Science and Human Wellness is an international peer-reviewed English journal that provides a forum for the dissemination of the