含棉浆和溶解浆耐久性档案纸的研制

档案纸是指具有高度耐久性和耐用性的一类纸张,新开发的耐久性档案纸在纸浆中添加了一定量的溶解浆或棉浆,碳酸钙加填,并采用AKD中性施胶,讨论了棉浆或溶解浆配用量对档案纸性能的影响。结果表明:棉浆或溶解浆配针叶浆生产档案纸具有优良的特性,棉浆或溶解浆比例增大,档案纸耐久性提高。溶解浆配针叶浆比例在15%,档案纸撕裂度在1202mN,耐折度960次,水抽提pH值8.5,碱保留量1.13mol/kg,卡伯值1.50。档案纸经(105±2)℃、72h(自然25年)干热加速老化后,各项指标符合国家标准。     

特种无酸档案专用纸

一种新型档案专用纸——特种无酸档案专用纸,日前在佳木斯造纸股份有限公司研制成功,并通过了专家鉴定。 特种无酸档案专用纸是盛装档案的最佳用纸。过去,我国各级档案部门都是使用国外进口纸。1年前,国家档案局、黑龙江省档案局与佳木斯造纸股份有限公司共同组成课题攻关小组,经反复研究终获成功。这种无     

耐久性无酸纸的应用及研究进展

介绍了耐久性无酸纸的定义,回顾了其国内外发展历程,分析了研究现状及应用的领域,耐久性无酸纸主要用于无酸档案纸、包装类无酸纸、中性办公用纸和高档照片输出介质。     

特种无酸档案专用纸

一种新型档案专用纸──特种无酸档案专用纸，日前在佳木斯造纸股份有限公司研制成功，并通过了专家鉴定。特种无酸档案专用纸是盛装档案的最佳用纸。过去，我国各级档案部门都是使用国外进口纸。一年前，国家档案局黑龙江省档案局与佳木斯造纸股份有限公司共同组成课题攻关小组后经反复研究终获成功。这种无酸纸经国家造纸检测中心多次检测，达到并超过最新拟定的技术指标．不仅实现了无酸要求，而且耐折度、撕裂度、强度、韧性均超过同类进口纸。特种无酸档案专用纸@志华     

档案纸张粘合剂性能分析及档案保护研究

为缓解档案保存时档案纸张脆化、残缺、弱化等现象,顺应档案管理与保护需求,需基于粘合剂对纸张与托纸进行粘合处理,以维护档案外观形态,提高档案纸张强度,延长档案保存时效。由此可见,纸张粘合剂的选择与性能是档案寿命与信息存储的关键影响要素。对此,为确保档案使用寿命与信息长期保存,对档案纸张用粘合剂作用机理与性能进行了详细分析,并针对性提出了一些切实可行的纸质档案保护措施,以期能够在一定程度上优化纸质档案保存与管理机制。     

直孔藏纸耐久性研究

藏纸是一种民族特色手工纸,被广泛应用于经书典籍、政府公文、档案卷宗等的书写,同时还被用于经书、档案的修补。为科学证实藏纸的良好性能,编写藏纸合理说明书,对其耐久性进行了研究。选取直孔藏纸、东巴纸、宣纸和手工构皮纸为研究对象,采取干热加速老化方法处理样品,分别测定其老化前后白度、耐折度、抗张力等指标,并进行红外光谱分析。结果表明,直孔藏纸老化前各项指标并不突出,但老化前后其白度、耐折度、抗张力保留率较好,且老化前后红外光谱分析变化并不大。老化前后直孔藏纸白度、耐折度、抗张力保留率分别为95. 22%、74. 65%、79. 71%,均大于本实验所选其他手工纸,说明直孔藏纸具有良好的耐久性。     

古代防蛀加工纸

以唐代、宋代、明清时间为序,根据大量古籍文献资料依次介绍了染潢纸、椒纸和万年红纸等三种古代防蛀加工纸的特点、避蠹防蛀原理以及制作方法。这些方法对今天的古籍文书档案的收藏和保护仍具有借鉴意义。     

纸质档案对少数民族语言的记录与保护——评《中国少数民族档案文献珍品研究》

正自诞生以来,纸对人类文化和精神文明成果地保存起到了重要作用。五千年来,华夏文明之所以经久不衰,最重要的原因就是被很好地保存了下来,或甲骨、或青铜、或绵薄、或纸。虽然,电子信息技术在当今社会飞速发展,大有取代传统纸之势,但是,纸质书籍和纸质档案仍具有其不可替代性。众所周知,我国是一个多民族国家,除汉族外,仍有五十多个少数民族。建国以来,受社会主流文化、经济、城镇化等因素的影响,少数民族文化发展举步维艰。少数民族语言作为其文化的重要载体,正濒临消亡。有些少数民族汉化较为严重,本族风俗习惯正逐渐消失,其语言只有少数老人掌握,处境堪忧。现阶段,通过纸质档案对少数民族语言和文化进行记录和保护,迫在眉睫。由郑慧、朱兰兰所著的《中国少数民族档案文献珍品研究》一书,对众多少数民族文献档案进行了详细研究,有助于少数民族语言、文化的记录与保存。     

有趣的狼毒纸

一、档案工作者的话题几年前,中国人民大学档案学院冯乐耘教授因公前往西藏,返京之后,有一次与我谈起档案用纸的问题时,提及他在西藏的观感,他说,西藏保存的档案材料,其中有一种名叫狼毒草做成的纸,品质很是特殊。无论用它抄写或者印刷的档案文件,经历很多年至今完整无损。据说,这种纸不怕虫子,虫子不敢爬上去,真是又奇妙,又有趣呵!     

档案专用耐久纸研制成功

一种新型的档案专用耐久纸最近由湖南省造纸研究所和湖南省档案馆合作研制成功。于1984年12月5—6日在湘潭通过鉴定。 技术鉴定会由湖南省轻工业厅主持,参加会议的有国家档案局、湖南省造纸公司及有关造纸厂、化工厂及设计院、大专院校共16个单位24名代表。 档案专用耐久纸采用优良的纤维原料和中性施胶、碳酸钙加填工艺制造。试制产品具有良好的抗老化性能。     

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