电子辐射对渗透性材料上书写墨水信息记录的影响

本文介绍电子辐射对不同墨水书写信息的影响。2001年10月当发现炭疽病毒感染邮寄的信件时,美国政府开始利用电子辐射杀死邮件上的病毒,并在全国推广这项技术。可是过了一段时间发现,这项技术对某些邮寄物品是有害的。数据表明电子辐射可能对邮品上存在的时间特征有损害,尤其是邮寄通过常规船运的美术和历史资料,时间特征是非常重要的。     

电子邮件系统的安全隐患及解决方法

电子邮件在获得广泛应用的同时,在安全性方面受到的威胁也越来越大。分析了邮件传输过程中常见的一些安全隐患,并结合大学校园网的实际环境提出了综合解决方法———采用PGP加密技术和邮件网关实现邮件系统的安全防护。经实践表明该方法使邮件在传输过程中安全系数得到很大提高。     

浅色胶布辐射硫化研究

辐射硫化是利用射线使橡胶实现碳-碳交联的过程。用电子加速器对橡胶助剂、辐射敏化剂、浅色胶布进行辐射硫化研究，说明用低能电子加速器可以实现浅色橡胶胶布辐射硫化工业化生产。     

涂层的FDJ-03型电子加速器辐射固化

一、引言涂料辐射固化是一项新技术,其辐射源为电子加速器,所以也称为电子辐射固化。以不饱和的齐聚物或者齐聚物与乙烯基单体的棍合物为基础的涂料,经电子射线辐射后,由于分子激发和产生离子,生成自由基,使齐聚物、单体或它们的混合物发生聚合、接枝或交联反应,导致三元网状结构的形成,从而使涂膜固化。我校对H-20丙烯酸酯涂料及其辐射固化做了初步研究。在试验室试验的基础上,用国产FDJ-03型低能大功率加速器对     

探讨网络电子档案信息安全保障策略

近年来,随着互联网技术的普及化发展,电子档案这个新生元素应运而生,并且在企业管理中受到了诸多管理者的青睐,使档案管理的效率得到了有效提升,但由于互联网开放化、虚拟化等特征,使电子档案管理始终存在信息安全隐患,使如今的档案管理工作面临新的难题,鉴于此,本分分析探讨了保障网络电子档案信息安全的相关策略,仅供参考。     

应用于OLED的Ir(Ⅲ)系列配合物磷光性质的DFT和TDDFT研究

过渡金属配合物由于其分子和电子结构的多样性已成为催化、分析化学、生物科学以及光电技术等诸多领域的重要研究课题。特别是在发光材料领域,过渡金属铱和铂的配合物,由于重金属原子的引入使其可以有效的利用三线态激子的辐射衰减来提高电致发光效率,进而引起了人们的极大兴趣。过渡金属配合物自旋轨道耦合能力强,能有效混合单重态和三重态激子,使电致发光器件内部量子产率达到100%,是理想的电致发光材料。本文利用理论计算方法研究了一系列过渡金属Ir(Ⅲ)配合物的几何结构、前线分子轨道性质、磷光光谱和电致发光性质。计算结果表明,辅助配体结构的改变对配合物电子结构和光谱性质有很大的影响。同时,本文中所研究的配合物都具有较好的空穴传输性质及电荷传输平衡的性能。     

橡胶辐射硫化及辐射硫化设备

辐射硫化是利用射线使橡胶实现碳-碳交联的过程。电子加速器是常用的辐射硫化设备．近年来，辐射硫化发展很快，应用范围越来越广。     

网络安全隐患与防范策略

众所周知,作为全球使用范围最大的信息网,网络安全已就成为当今网络社会的焦点中的焦点,病毒、黑客程序、邮件炸弹、远程侦听等,随着Internet的飞速发展,与它有关的安全事故屡有发生。对网络安全的威胁主要表现在:非授权访问,冒充合法用户,破坏数据完整性,干扰系统正常运行,利用网络传播病毒,线路窃听等方面。这要求我们与Internet互连所带来的安全性问题予以足够重视。     

3月份全国农药进出口统计

山东邮政系统依托邮政网络建设“万村于乡”工程，服务三农，今年将在全省完成7000个”农资农家店”建设。目前，山东邮政系统已在全省17个市139个县市区建立了112个县级邮政物流分公司、2068个乡镇邮政物流配送中心和8万个村级”邮政三农服务站”，服务网络覆盖了全省，形成了“省-市-县-乡-村”五级配送网络，服务范围遍及全省所有乡村，已成为联系农村和生产企业的重要渠道。     

我国涂料辐射固化产业的发展现状

随着我国对环境、能源问题的日益关注,以及国民经济快速而平稳的发展,辐射固化技术得到了越来越广泛的应用。2007年我国辐射固化产业发展势头良好。受到世界各国辐射固化领域同行的密切关注。今后的几年,我国将节能减排作为发展工业最重要的考核指标,无疑,这对于发展辐射固化技术是一个契机。另一方面,由于电子加速器设备昂贵,我国电子束固化技术依然发展缓慢。但由于电子束固化所带来的独特优点,将会首先在食品包装、电子产品、航天航空、汽车制造等领域得到应用。 2006年,中国感光学会辐射固化专业委员会统计了129家主要的紫外（UV）固化产品生产企业的经济信息,其中原材料生产企业40家,紫外固化涂料生产企业81家,Uv光源和设备生产企业8家。相比2006年,2007年单体的产量相当,而出口超过1．6万t,增长100％;低聚物产量增长15．2％,并开始少量出口：光引发剂产量继续保持快速增长趋势,达到33.9％,出口超过总产量的70％。清漆和油墨保持12、1％和13．6％的年增长速率,粘合剂由于基数低,呈现出快速增长的势头．达73％。目前我国辐射固化产品市场的发展还不平衡．家具和印刷用紫外固化清漆涂层以及印刷品和包装材料用油墨仍是辐射固化技术最大应用领域。     

微波对不同插层剂插入高岭石的作用与比较

用X射线衍射和红外光谱研究在微波辐照下不同种类的插层物插入高岭石层间的效果。结果表明：微波对大偶极距、小分子物质,如二甲亚砜(dimethyl sulphoxide,DMSO)的插层反应具有相当明显的促进作用,当DMSO插层率为82．2％时,微波辐照可使插层时间从通常的几天缩短到1h。同时,实验也表明,微波对醋酸钾、尿素等物质的插层促进作用相当微弱,其原因是微波对各种插层物、水以及高岭石的热效应与非热效应综合作用的结果。     

Anthrax: the challenges for decontamination

Anthrax remains endemic in many parts of the world with regular infections of livestock presenting a consequent risk to public health. In the United Kingdom anthrax has diminished as a significant threat to human health with only sporadic outbreaks in farm animals derived from ingestion of spores from soil at sites associated with previous outbreaks and the burial of carcasses. Occupationally‐derived anthrax, associated with industries involved in the processing of animal products, has historically had an impact on the occurrence of outbreaks of infection. The introduction, in 1965, of vaccination for workers in high‐risk occupations contributed significantly to the eradication of the disease from the UK. During 2001 the deliberate release of anthrax spores in the USA, disseminated through the postal system, resulted in the infection of 22 people, five of which resulted in death through inhalational anthrax. At that time anthrax was unheard of in many clinical practices and there was a lack of training and preparedness to handle such incidents; the emergency resulted in medical and public health personnel across the world having a significantly raised awareness of both the organism and the clinical symptoms of infection, and the new threat posed by bioterrorism. In the USA, the immediate public health emergency was followed by the legacy of contaminated buildings and facilities. There had been little previous systematic study of the issues surrounding sampling and decontamination of areas contaminated with Bacillus anthracis. The decontamination of large complex buildings and the equipment they contained required the urgent development and validation of new procedures for both sampling and decontamination. Copyright © 2006 Society of Chemical Industry     

电子束辐照和氢氧化铝对LLDPE/EVA共混物凝胶含量和力学性能的影响

研究了电子束辐照剂量和氢氧化铝(ATH)的含量对线性低密度聚乙烯(LLDPE)/乙烯-醋酸乙烯酯(EVA)共混物凝胶含量和力学性能的影响。辐照剂量是影响LLDPE/EVA/ATH阻燃体系凝胶含量的主要因素,而ATH对其凝胶含量的影响较小。随着ATH含量的增加,LLDPE/EVA共混物的拉伸强度逐步增加,断裂伸长率迅速下降。所有阻燃体系的拉伸强度均是随着辐照剂量的增加而逐步增大,但辐照剂量对这些阻燃体系的断裂伸长率的影响却比较复杂。     

Estimating aerosol hazards from an anthrax letter

Events following the anthrax letter incidences in 2001 changed many previously held assumptions regarding biological aerosol hazards. As there were significant fatalities resulting from the sorting of a single anthrax letter, it suggests there is a need to reevaluate how best to measure biological aerosols and to use the information to make accurate predictions. This paper describes the biological aerosol created from manipulating envelopes containing Bacillus subtilis globigii spores (a simulant for anthrax). In addition, the measurements on dispersion of spores from an envelope processed by a mail sorter provide important dynamic aerosol characteristics, information previously unavailable for health risk assessment. The findings produced a number of significant aerosol dosage estimates related to spore contaminated letters. Graphic presentations show significant hazard in handling anthrax-laced letters. Aerosol particle dynamics are described and specific lethal dosage values are listed for a range of activities; these will be useful in assisting the modeling community to create more realistic predictions in hazard assessment studies.     

Direct-writing of PbS nanoparticles inside transparent porous silica monoliths using pulsed femtosecond laser irradiation

Pulsed femtosecond laser irradiation at low repetition rate, without any annealing, has been used to localize the growth of PbS nanoparticles, for the first time, inside a transparent porous silica matrix prepared by a sol-gel route. Before the irradiation, the porous silica host has been soaked within a solution containing PbS precursors. The effect of the incident laser power on the particle size was studied. X-ray diffraction was used to identify the PbS crystallites inside the irradiated areas and to estimate the average particle size. The localized laser irradiation led to PbS crystallite size ranging between 4 and 8 nm, depending on the incident femtosecond laser power. The optical properties of the obtained PbS-silica nanocomposites have been investigated using absorption and photoluminescence spectroscopies. Finally, the stability of PbS nanoparticles embedded inside the host matrices has been followed as a function of time, and it has been shown that this stability depends on the nanoparticle mean size.     

纳米TiO_2光声协同催化损伤牛血清白蛋白的研究

选取牛血清白蛋白为模拟物,研究了纳米二氧化钛光声协同催化作用对BSA的损伤,考察了催化剂用量、初始溶液pH、照射时间等因素对BSA分子损伤的影响。实验结果表明,TiO2光声协同催化作用对BSA的损伤效果明显好于TiO2超声催化或光催化处理,证实了光声联合催化技术具有明显的协同效应。初步探讨了光声协同照射激活纳米TiO2粒子损伤BSA分子的机理,认为是光声协同作用产生高能空穴和羟基自由基所致。     

Moderne Lackierungsverfahren I

Modern Processes for Coating Demands for environmental safety and the need for energy saving has led to considerable modification of processes and materials used in the coating industry. The most important modern process for coating, highly suited for large scale operation, is the electro-immersion painting which is carried out in aqueous phase. Paints that can be diluted with water and applied by usual means are also very promising. Good experiences have also been made in special fields using non-aqueous dispersions. Ultimate aim is the development of paints containing none or very little solvents. Elimination of the solvent has already been achieved using coating powder, which are becoming of increasing significance. Significant advances have also been achieved in coil-coating as well as in methods involving hardening by irradiation. Hardening using ultraviolet light has already found some limited application, whereas the highly promising technique of hardening with electron irradiation is still under trial.     

Experimental Investigation of the Recovery of Soaked Paper Using Evaporative Freeze Drying

The aim of this article is to develop an experiment and a procedure to investigate the restoration of water-damaged paper and archival materials using freeze drying in order to allow a reproducible test and comparison of the influence of different operating conditions on drying time and restored paper quality. Firstly, a reproducible method for the preparation of soaked samples simulating water-damaged paper has been developed. Then, the samples have been freeze-dried in a laboratory-scale apparatus that allowed monitoring the temperature as well as the weight of the samples. The technique of evaporative freezing, which reduces the drying time required, has been used in this case. An innovative procedure for the visualization of the progress of the drying process has been validated, thus allowing the validation of a simple phenomenological model of the time evolution of the ice core volume; in addition, data on the residual moisture of the dried paper sheets in different zones have been given. Finally, optimization of this particular drying process by using simple or more sophisticated approaches has been discussed.