红外线合成图像在变造文件检验中的应用与分析

在文件检验中,黑白红外线照相是一种检验变造文件的方法,然而,在某些情况下效果欠佳。为了提高检验的准确性,不妨可以应用红外线合成图像的方法。应用Photoshop图像处理方法,根据红外线彩色照相的感光原理和色彩再现过程,对数码照相机拍摄的可见光图像和红外线图像进行适当处理,即可生成红外线合成图像。这种图像可以反映字迹对可见光和红外线的吸收与反射情况,通过判断字迹颜色有否改变来检验书写色料的异同。由此可见,利用红外线合成图像方法检验某些变造文件,可以获得黑白红外线照相无法得到的检验结果,这对提高鉴定结论的准确性具有实际应用价值。     

美国反网络恐怖活动的情报工作及对我国的启示

网络恐怖活动具有成本低廉、破坏广泛、技术性高、隐蔽性强等特点。美国在反网络恐怖活动的情报工作中采取了完善情报立法、构建网络式结构反恐情报体系、大力开展网络侦查等一系列情报对策．构建了强大的国家安全屏障。在我国,防范和打击网络恐怖活动一方面要树立信息时代的新威胁观与安全观．另一方面则可借鉴美国反网络恐怖活动情报工作的经验。     

公安网络舆情搜集机制研究：内容与渠道建设

网络舆情搜集的内容与渠道是公安机关网络监测机制建设的重点,要根据公安机关的职能与使命。研究和确定公安机关网络舆情搜集的主要内容和范围。在此基础上,根据覆盖全面、重点突出、渠道稳定、高效及时的原则,确定网络媒体监测重点,建立稳定且广泛的舆情搜集渠道,构建触角深入、广泛的舆情搜集网络,创新公安机关网络舆情监测机制。     

浅议公安系统网络安全与建设

公安信息网的安全管理是一个全方位、多层次的问题,是一个不断完善和不断提升的过程。没有一种技术可以绝对保证网络安全,人的因素也很重要。因此,要做好内部的网络安全,不仅仅需要高新的安全技术手段、周密的安全策略,更需要不断提高系统管理人员和系统使用人员的安全意识,让网络中的每一个用户都对网络安全问题重视起来,做好信息安全防范工作,这才是最关键、最好的、最有效的解决方案。     

论网络虚拟财产的“财产”属性——以刑法规范为视角

随着信息技术的不断发展,“网络虚拟财产”已与现实的生活建立起越来越紧密的联系。如何保护网络虚拟财产在刑法上还是一个盲点。由此导致的社会问题也随之而来。网络虚拟财产具有财产属性和法律意义上的财产权性质,应当包括在刑法保护对象内。我国刑法应严格区分“财物罪”与“利益罪”。     

Age determination of ballpoint pen ink by thermal desorption and gas chromatography-mass spectrometry

Two main approaches can be used for determining the age of an ink: indirect dating and direct dating. Indirect dating is based on the chemical analysis of an ink followed by comparison with known samples in a reference collection. The collection should contain information about the inks including the market introduction dates. This approach may allow for an anachronism to be detected. The second concept is based on measuring ink components that change with age. The analysis of solvents in ballpoint inks may be a useful parameter for determining the age of ink on paper. In a previous study, the authors demonstrated that thermal desorption of ink directly from paper, followed by chemical analysis using gas chromatography-mass spectrometry (GC-MS), is a promising procedure for characterizing ink-binder resins and solvents. Preliminary tests showed that monitoring the evaporation of ink solvent from ink on paper is not a suitable method for ink dating. Thermal analysis of ink on paper in two steps revealed that fresh ink releases a relative amount of solvent at a certain low temperature in a defined period of time, which decreases as the ink ages. As a consequence, this relative amount of solvent released at a certain low temperature, and its decrease with time, can be used to estimate ink age. This age-dependent parameter was studied in 85 different inks ranging in age from 1 week to 1.5 years. It was found that some inks showed a significant decrease of this parameter up to an age of several months, and that the aging process can be monitored within this period. For other inks, however, the age-dependent parameter decreases relatively fast, e.g., within a few days, to a constant level, which can be too fast for casework. Based on these results, a general procedure for assessing the age of ballpoint pen inks on paper was developed.     

全球治理与国际竞争法的网络模式

由于新自由主义理论的勃兴和市场机制的内在张力,国际社会步入了国际化市场经济阶段。国际化市场经济要求国际社会建立国际竞争机制解决国际市场失灵。在"洛克式"的国际体系下,借助全球治理理论建立一个多层次的国际竞争治理网络模式是国际社会现实的选择。多层次的国际竞争治理网络模式可以借鉴经济学的联邦财政理论和体制竞争理论确定各个层次的管辖权划分。     

Identification of colorants in pigmented pen inks by laser desorption mass spectrometry

Pigments are rapidly replacing dyes as colorants in pen and printer inks, due to their superior colors and stability. Unfortunately, tools commonly used in questioned document examination for analyzing pen inks, such as TLC, cannot be used for the analysis of insoluble pigments on paper. Laser desorption mass spectrometry is demonstrated here as a tool for analyzing pigment-based pen inks. A pulsed nitrogen laser can be focused onto a pen stroke from a pigmented ink pen on paper, and positive and negative ions representative of the pigment can be generated for subsequent mass spectrometric analysis. Targeted pens for this work were a set of Uni-ball 207 pigmented ink pens containing blue, light blue, orange, green, violet, red, pink, and black inks. Copper phthalocyanine was identified as the pigment used to make both blue inks. A mixture of halogenated copper phthalocyanines were identified in the green ink. Unexpectedly, the pink ink was found to contain a red pigment, Pigment Red 12, treated with a mixture of water-soluble dyes. Each sample yielded ions representative of the pigments present.     

网络赌博犯罪初探--从赌博罪司法解释入手

随着网络的普及,网络赌博日益泛滥,危害严重,给刑法的适用带来一系列问题,最新颁布的<关于办理赌博刑事案件具体应用法律若干问题的解释>为解决网络赌博的法律适用问题提供了法律依据,在司法实践中应从司法解释入手,结合相关刑法原理,对网络赌博的性质、刑法适用和国际刑事合作等问题进行了规范.     

网络安全威胁及保护策略

随着Internet的迅速普及和发展 ,人类社会发展的信息化趋势越来越明显。由之引起的网络安全问题尤为突出。本文从“面临的威胁”及“应对策略”两个方面对网络安全问题进行了综合的分析和论述。