棉纺规律性条干不匀的检测

棉纺规律性条干不匀是成纱主要疵点之一,对织物外观和内在质量影响很大.规律性条干不匀具有波的特性,可用条干仪、布面分拆称重等方法测试其波长,再根据推导出的规律性条干不匀波长和缺陷部件转速的计算公式,可诊断产生纱疵的工序及机件.介绍了诊断的方法及步骤,并列举了实例;总结了常见规律性条干不匀的形成原因及波长范围,介绍了规律性条干不匀的有关计算公式在开发计算机纱疵分析软件中的应用.     

降低纺纱过程中毛纱条干不匀率的探讨与实践

本文结合生产实践，从原料，工艺和设备三方面探讨了降低纺纱过程中毛纱条干不匀率的一些实际方法，对应用波谱分析控制纺纱各工序质量等问题了提出了一些体会。     

曲线图在纱条疵病分析中的应用

探讨曲线图在纱条疵病分析中的作用。以诸多实例分析说明了电子条干均匀度测试中曲线图的特征以及运用曲线图进行疵点分析的方法。分析表明,与波谱图相比,曲线图能够直观反映纱条粗细变化情况,显示纱条长片段不匀,发现一些波谱图不能反映出的问题,能够更加准确地分析不匀波长,有时比波谱图分析更加简单,并能够准确地显示纱条中偶发性疵点的形态。认为,曲线图在纱条疵点分析中具有独特的优势;充分利用曲线图信息,可更好地进行纱条疵病分析工作,促进成纱条干质量的改进。     

提高粗梳毛纱成纱条干的探讨

对和毛、喂毛、梳理、成条以及细纱工艺的不匀率进行了分析,探讨了粗梳毛纺生产过程中造成毛纱条干不匀的原因和改进的措施。     

牵伸对纱条条干不匀影响的模拟研究

牵伸时纤维运动引起其排列变化是影响牵伸后纱条条干不匀的关键.为探究纤维变速点分布对牵伸后纱条条干不匀的影响,通过计算机模拟了实际纱条中的纤维排列(实际纱条),分别对理想纱条和实际纱条牵伸过程中的纤维运动进行了模拟,计算了在不同变速点分布下牵伸后纱条的条干不匀,并进行实验验证.结果表明:与理想纱条相比,实际纱条的条干不匀...     

毛精纺纱条不匀的波谱分析

随着纱条不匀理论研究和乌斯特条干波谱仪的发展，目前已能迅速、有效、简易地测试和判析各种纱条不匀率CV值的不匀结构，从而对纺纱生产过程进行质量监控，确保生产过程平衡有序地进行。在生产实践上，具有相近但不同短、中、长片段不匀率数值的纱条，其不匀直观冈邰呈现各不相同的形念，织入布后其布面可能显示差异极为显著的不同形念，说明不匀率数值本身并不能全部表达纱条不匀的性能；     

纤维线密度及直径不匀率对成纱条干的影响

纤维线密度及直径不匀率是影响纱线条干的重要因素,目前成纱条干的极限不匀率主要是根据Martindale公司得出的,该公式虽然综合考虑了纤维线密度及直径不匀率对成纱条干均匀度的影响,但没有分别反映出二者对成纱条干的影响程度。因此,利用图像解析的方法,分析两组分纤维混纺时纤维线密度关系对成纱极限不匀的影响,得出当二者线密度系数约为0．2～0．3时,理论上可达到最小的条干不匀。     

棉纺纱条条干不匀计算机诊断的实现

分析了棉纺纱条条干不匀的种类和产生原因，介绍了计算机辅助诊断的可行性和原理；针对基于波谱图的机械波、牵伸波、部分特殊机械波的诊断，外观简易诊断和设备不良诊断进行程序设计，实现了对于棉纺各工序条干不匀的计算机故障诊断。     

细纱工序降低威纱条干不匀率的分析

通过一系列的对比试验和测试，分析了细纱工序牵伸工艺、牵伸元件和机械状态对成纱条干的影响，为降低成纱条干不匀率提供参考。     

方便装卸绒卷的条干仪纱架

为了解决条干仪用粗纱架测试棉条绒卷时装卸不便、测试效率低的问题,设计一种通过纱筒组合装置和吊锭配合的、可方便装卸绒卷的条干仪纱架。介绍该绒卷纱架测试工作原理及变异系数CV值、不匀率U值的计算方法,通过对比3种纱条在2种纱架上的不匀率曲线和测试数据,表明新纱架更换绒卷便捷,耗时短,测试效率高,纱线断裂概率减小。     

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.     

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     

Chinese CTP Market

According to Printing and Printing Equipment Industries Association of China（PEIAC）＇s statistics to the plate manufucturer in China, in 2013, the actual offset plate production has reached 346 million square meters in China. Among them, the CTP production volume was 245 million square meters, up by 11% than that of last year; the total sales of the CTP plate was 239 million square meters, up by 13%.     

Preparatory Work of Print China 2015 is Going Smoothly

正Held at Guangdong Modern International Exhibition Center,Print China 2015 will cover 7exhibition halls,besides the original Hall No.3,4,5,6,7,the newly built F zone of Hall 3 will be used too.The total area will be140,000 square meters.Hall 3:Offset and large printing equipment,package printing equipment,post press