ARP木马的攻击原理及防御

ARP欺骗是现在校园和企事业单位网络中普遍碰到的问题,本文针对ARP欺骗的原理及预防ARP攻击的产生做了简单的探讨,为大家提供一些解决ARP欺骗的措施。     

Continuous monitoring of wooden works of art using fiber Bragg grating sensors

In recent years the control and monitoring of works of art has gained more and more importance. In particular, works partially or totally realized with wood, such as polychrome sculptures, painted panels or Crucifixes, are highly sensitive and delicate and thus need a particular attention. The wooden support is, in fact, an essential element for the stability of pictorial layers: the color lies on a preparation, which in turn, is anchored to the wood. Wrong conservation methods, i.e. in an environmental climate that is not controlled, or intrinsic mechanical stresses, can warp such structures, and the effects can be irreversible and destructive to the painted layer. The use of fiber Bragg grating (FBG) sensors for the quasi-distributed, in situ measurement and continuous monitoring of deformations in painted wood panel is proposed. In order to demonstrate the applicability of FBG sensors to painted wood panels, a wooden support, made using the same 15th–16th century techniques, was prepared in the Opificio laboratories. A number of Bragg grating sensors were affixed in several critical points, on the back and front sides and on the strengthening cross-beams, in order to detect deformations in the panel dependent on the variations in the environmental relative humidity (RH). Measurements during the removal of the cross-beams are also reported. The results of measurements have shown the applicability of FBG sensors for the continuous in situ monitoring of valuable wooden objects and works of art.     

Conservation of chemically degraded waterlogged wood with sugars

The effectiveness of two non-reducing sugars, both analogues of sucrose, to conserve degraded waterlogged wood was examined. The two sugars examined are trehalose and sucralose, both stable and relatively unreactive. The ability of these sugars to conserve a series of degraded tongue depressors was measured by determining the anti-shrink efficiency of each at various concentrations and comparing them to sucrose. The findings of this study indicate that both sucralose and trehalose may be effective conservation treatments for waterlogged archaeological wood and that at moderate concentrations the performance of both is comparable to sucrose. However, sucralose has a lower solubility, and concentrations higher than 60% w/v were not examined, whereas concentrations of up to 100% w/v of trehalose were studied. At these higher concentrations trehalose performed as well, if not better than sucrose, although there were crystalline deposits on the wood surface at these higher concentrations. With modifications and careful control, both of these sugars may be suitable conservation alternatives to sucrose due to their long-term stability and resistance to hydrolysis.     

《木材学》课程教学问题比较与思考

从选课方式、课堂教学、实践教学及考评方式等方面对中美"木材学"课程教学进行了比较分析,借鉴美式教学方法优点,结合当前《木材学》课程教学中存在的问题,提出了《木材学》课堂教学的自主学习型教学方案及实践教学的小组项目设计方案,并对专业课的选课方式和考评方式提出了改革建议,以期为我国木材学课程建设和教学改革提供借鉴。     

木材学中国大学视频公开课的建设及教学探讨

以东北林业大学木材学中国大学视频公开课的建设为契机,讨论了木材学大学视频公开课建设的意义。并进一步提出东北林业大学木材学课程建设中存在的问题、取得的成效及继续改进办法。     

鲍勃.特罗特曼于雕刻中探索未知

通过对美国著名雕刻家鲍勃·特罗特曼作品形式与象征意义、作品表达的思想概念、作品的构思及创作过程、对其艺术产生过影响的人、创作所受的哲学启发等五方面的分析论述,认为其创作是在探索一种脱离的概念,契合了具有理想之美的希腊美学,展现一种残缺美的理性价值——粗俗的、破败的、零散的、碎裂的,使人感受到心灵慰藉的沉郁和孤独感,是于雕刻中探索未知的典范。     

我国木材加工业供应链结构及特征研究

本文探讨了木材加工业供应链的内涵、结构和特征。木材加工业供应链由木材资源供应商、木材加工企业、木材制品销售商和最终用户构成。木材加工业供应链存在着复杂性、动态性、交叉性和风险性等特征。并根据木材加工业供庆链的结构和特征,提出了提升木材加工业供应链竞争力的建议。     

Students in the Forest: The Role of Design-Build Pedagogies in Repairing Material Disconnections in Architecture Education

This article explores an intellectual disconnection in architectural education about the conception of wood as a building material. It explores initiatives to develop in future architects a deeper consciousness of the complex ecology of timber, promoting its sustainable use in the building industry. It explores six case studies drawn from architectural education to explore the ways in which the properties that make timber sustainable are explored through research and design, and how this deep understanding is transferred to students through hands-on applications.     

扬州西汉墓陪葬木俑初探

作为西汉诸侯王国的都城所在地,扬州目前已发掘的西汉木椁墓中出土了较多陪葬木俑。这些木俑分别经历了西汉前期、西汉中期和西汉晚期前段、西汉晚期后段共三期四阶段,其形制按内容可分为人俑和动物俑两大类,种类丰富、造型生动。这些西汉墓陪葬木俑的发展与当时的社会发展状况、外来文化的影响以及自然环境因素有着密切的联系。     

高尔夫木杆挥杆技术动作的运动力学分析

采用实验测试法,运用APAS运动技术软件和DLT生物力学三维录像分析方法,对不同水平的高尔夫球员的木杆挥杆技术动作进行分析。研究表明,高水平高尔夫球运动员的上、下杆挥杆节奏较好,用时比例接近于80：20;高水平球员的身体重心在X、Y、Z轴上的移动非常稳定,在击球瞬间都非常接近原点。