软件漏洞模糊测试的关键分支探索及热点更新算法

在软件开发及应用中,由于具有可复现性,模糊测试能够帮助发现漏洞和有针对性地对漏洞成因进行分析。为了解决模糊测试过程的效率及测试力度等问题,提出了软件漏洞模糊测试的关键分支探索及热点更新算法。该方法通过捕获、分析和利用受检程序在处理测试用例时的执行位置的关键信息,以指导模糊测试过程的探索方向和测试用例的生成。实验结果表明,提出的方法相较于传统随机发散的模糊测试方法在漏洞发现能力上有较大提升,在Otfcc、Swftools等14个开源程序中发现了100余个未被公布的漏洞,为模糊测试用于软件漏洞检测提供了新的可靠途径。     

小波瀑布型多重网格法

为了提高偏微分方程的计算精度,由瀑布型多重网格的速度收敛快以及小波多分辨分析的性质,通过改进传统瀑布型多重网格算法中的插值算子,提出一种新的小波瀑布型多重网格方法。数值结果表明,小波瀑布型多重网格方法比传统的瀑布型多重网格方法具有更高精度。     

二层交换机的攻击分析与防范技术的研究

本文通过OSI模型的第二层的特点,分析了二层交换机存在的安全隐患,提出了相应的解决办法。     

Fabrication of Cu(In,Ga)Se2 thin films by ion beam sputtering deposition from a quaternary target at different substrate temperatures

Cu(In, Ga)Se₂ (CIGS) thin films were fabricated by ion beam sputtering deposition from a single quaternary target at different substrate temperatures (T _sub). The thin films were characterized with X-ray diffractometry, scanning electron microscopy, energy-dispersive X-ray spectroscopy and four-point probe technique to study the microstructures, surface morphology, composition and electrical properties, respectively. The results show that the films grown above 400?°C are of chalcopyrite structure. Cu(In_0.7Ga_0.3)Se₂ thin film was obtained when T _sub is 550?°C. The Cu and Se atomic percentage when T _sub is above 500?°C is higher than when T _sub is below 500?°C. With the increase in T _sub, the surfaces morphology of the films is denser and the resistivity of the films decreases.     

国内外环氧树脂的生产现状及应用进展

本文阐述国内外环氧树脂发展动向及应用进展。     

高速定时分件供送螺杆系统研究新进展──变螺距螺旋线设计新方法初探

着重阐述在高速定时分件供送螺杆基础理论的系统研究中，长期以来未能很好解决的一些难题，进一步探讨合理设计变螺距螺旋线的新方法以及确定有关参数的若干准则。     

Distinct Tomato Cultivars Are Characterized by a Differential Pattern of Biochemical Responses to Drought Stress

Future climate scenarios suggest that crop plants will experience environmental changes capable of affecting their productivity. Among the most harmful environmental stresses is drought, defined as a total or partial lack of water availability. It is essential to study and understand both the damage caused by drought on crop plants and the mechanisms implemented to tolerate the stress. In this study, we focused on four cultivars of tomato, an economically important crop in the Mediterranean basin. We investigated the biochemical mechanisms of plant defense against drought by focusing on proteins specifically involved in this stress, such as osmotin, dehydrin, and aquaporin, and on proteins involved in the general stress response, such as HSP70 and cyclophilins. Since sugars are also known to act as osmoprotectants in plant cells, proteins involved in sugar metabolism (such as RuBisCO and sucrose synthase) were also analyzed. The results show crucial differences in biochemical behavior among the selected cultivars and highlight that the most tolerant tomato cultivars adopt quite specific biochemical strategies such as different accumulations of aquaporins and osmotins. The data set also suggests that RuBisCO isoforms and aquaporins can be used as markers of tolerance/susceptibility to drought stress and be used to select tomato cultivars within breeding programs.     

Environmental Stress and Plants

Land plants are constantly subjected to multiple unfavorable or even adverse environmental conditions. Among them, abiotic stresses (such as salt, drought, heat, cold, heavy metals, ozone, UV radiation, and nutrient deficiencies) have detrimental effects on plant growth and productivity and are increasingly important considering the direct or indirect effects of climate change. Plants respond in many ways to abiotic stresses, from gene expression to physiology, from plant architecture to primary, and secondary metabolism. These complex changes allow plants to tolerate and/or adapt to adverse conditions. The complexity of plant response can be further influenced by the duration and intensity of stress, the plant genotype, the combination of different stresses, the exposed tissue and cell type, and the developmental stage at which plants perceive the stress. It is therefore important to understand more about how plants perceive stress conditions and how they respond and adapt (both in natural and anthropogenic environments). These concepts were the basis of the Special Issue that International Journal of Molecular Sciences expressly addressed to the relationship between environmental stresses and plants and that resulted in the publication of 5 reviews and 38 original research articles. The large participation of several authors and the good number of contributions testifies to the considerable interest that the topic currently receives in the plant science community, especially in the light of the foreseeable climate changes. Here, we briefly summarize the contributions included in the Special Issue, both original articles categorized by stress type and reviews that discuss more comprehensive responses to various stresses.     

企业标准化体系与质量体系的关系

＠蔡伟￥太原化学工业集团公司企业按ＧＢ／Ｔ１９０００—ＩＳＯ９０００系列标准建立完善的质量体系,既强化内部管理,严格过程控制,降低生产成本,提高产品质量,增加经济效益,又为企业带来了良好的市场效益。企业标准化工作由原来单一的技术标准延伸到管理工作范围。工业...