具脱层的正交各向异性梁-板的屈曲分析

根据非线性理论，假定脱层为贯穿梁幅的一维脱层，且脱层位置任意，建立了轴向压力作用下含脱层的正交各向异性梁－板的非线性控制方程，对结构进行了分区处理，通过使控制方程适当线性化，利用脱层前缘的连续性条件、平衡条件及相容条件，导出了夹支边界情况下的具脱层的正交各向异性梁－板关于屈曲荷载的无量纲化的特征方程，确定了临界压力荷载，并讨论了脱层尺寸及位置对临界荷载的影响。     

沿海沙岸防风固沙木麻黄试验示范林抗御台风分析

湛江市“９６１５”号台风给沿海防护林带来了巨大损失，对国营东海林场木麻黄试验示范林从７个方面进行风害调查分析，结果表明：林木侧根多，而且粗壮，平均胸径大的标准地受破坏轻，抗风能力强；林木平均树高、冠幅和高径比大的标准地受破坏重，抗风能力差。位于临海最前沿的第一试验区受破坏严重；被它保护下的第二至第四试验区受破坏程度逐渐减轻。     

Effects of landscape structure on nest predation in roadsides of a midwestern agroecosystem: a multiscale analysis

Nest predation is an important cause of mortality for many bird species, especially in grassland ecosystems where generalist predators have responded positively to human disturbance and landscape fragmentation. Our study evaluated the influence of the composition and configuration of the surrounding landscape on nest predation. Transects consisting of 10 artificial ground nests each were set up in 136 roadsides in six watersheds in south-central Iowa. Nest predation on individual roadside transects ranged from 0 to 100% and averaged 23%. The relationship of landscape structure within spatially-nested landscapes surrounding each roadside transect (within 200, 400, 800, 1200, and 1600 m of the transect line) to nest predation was evaluated by using multiple regression and canonical correlation analyses. The results of this multiscale landscape analysis demonstrated that predation on ground nests was affected by the surrounding landscape mosaic and that nest predators with different-sized home ranges and habitat affinities responded to landscapes in different ways. In general, wooded habitats were associated with greater nest predation, whereas herbaceous habitats (except alfalfa/pasture) either were associated with less nest predation or were not important. Different landscape variables were important at different spatial scales. Whereas some block-cover habitats such as woodland were important at all scales, others such as rowcrops and alfalfa/pasture were important at large scales. Some strip-cover habitats such as gravel roads and paved roads were important at small scales, but others such as wooded roadsides were important at all all scales. Most landscape metrics (e.g., mean patch size and edge density) were important at large scales. Our study demonstrated that the relationships between landscape structure and predator assemblages are complex, thus making efforts to enhance avian productivity in agricultural landscapes a difficult management goal.     

试用关联度分析人才结构的合理性

人才，是经济社会活动诸多要素中最主要，最活跃的要求，结构合理的人才队伍才有可能产生高的效率和效益。本文应用灰关联度分析方法，以通信产业人才队伍为例进行分析，为制定合理的人才队伍结构提供了一种评价方法。     

克雷伯氏菌胞外多糖的制备与组成分析

利用不同血清型的克雷伯氏菌Klebsiella菌株液体发酵,制备胞外多糖,并采用气相色谱和化学分析方法分析胞外多糖的化学组成。结果表明,菌株K26产胞外多糖的能力最高,培养48h和72h的产量分别为3.11mg/ml和3.89mg/ml;各实验菌株的胞外多糖的单糖组成包括甘露糖、葡萄糖和半乳糖。     

文心兰种质遗传多样性的SRAP分析

利用SRAP标记分析文心兰部分种质资源的遗传多样性，采用30对引物组合对33份文心兰种质进行扩增，从中筛选出19个多态性较高的引物组合，共产生277条多态性条带，平均每个引物组合产生14.6个多态性条带，相似系数在0.280～0.927。通过聚类分析发现，在值为0.37时，可将33份文心兰种质划分为4大类群。第Ⅰ类厚叶大花品种，第Ⅱ类为厚叶小花品种，第Ⅲ、第Ⅳ类均为类薄叶品种。 结果表明，文心兰种质的聚类与其遗传背景有很大的关系。     

车用磁流变液制动器制动效果分析与研究

以磁流变液(MRF)的流变特性为基础,推导了双盘式圆盘型磁流变液制动器的制动力矩计算公式;在整车环境下对磁流变液制动器进行了匹配设计,并在Matlab/Simulink软件环境下建立ABS制动控制系统模型;在ABS模型中,对磁流变液制动器的性能进行了仿真和分析,其结果证实磁流变液制动器具有优越的综合制动效果。     

Discrimination of ‘San Marzano’ accessions: A comparison of minisatellite, CAPS and SSR markers in relation to morphological traits

‘San Marzano’ (SM) is one of the most widely known tomato (Solanum lycopersicum L.) cultivars, and is a classic example of a local variety with a premium value. Unfortunately, the original cultivated form is underrepresented in the Protected Denomination of Origin (PDO) area because of the incidence of contaminant and phenotypically similar genotypes. Our aim was to examine the ability of three DNA marker systems (minisatellite, cleaved amplified polymorphic sequence (CAPS) and simple sequence repeat (SSR)) to reveal the genetic diversity of tomato accessions that were, based on a morphological analysis, very similar. The data indicate that both minisatellites and SSRs can be used to genetically distinguish the analysed materials. Furthermore, these two marker systems depict relationships consistent with the hierarchal pattern obtained by the morphological data. As locally cultivated tomato accessions are often characterised by some degree of genetic variability, our results will be valuable in facilitating the purification, management and breeding of tomato germplasms. The differences between the marker systems employed are also discussed in relation to their usefulness in the agro-food chain.     

MdMYB1转录因子调控红星苹果果实着色的计算机模拟分析及表达验证

 从‘红星’苹果(Malus domestica‘Delicious’) 果实中克隆获得了MdMYB1基因, 通过生物信息学分析( in silico analysis) 和活体细胞融合蛋白荧光观察, 确定其编码蛋白定位于细胞核。同时, 克隆了MdDFR和MdUFGT基因的启动子, 模拟分析表明2个基因的启动子序列中含有MYB结合的顺式作用元件。为了探讨MdMYB1转录因子是否调控MdDFR和MdUFGT基因的表达, 对不同光照条件下果皮花青素含量和基因表达进行了检测, 结果表明光照能够诱导花青素积累, 并迅速启动3个基因表达, 且3个基因表现出高度相似的表达模式, 表明MdMYB1转录因子可能直接调控MdDFR和MdUFGT基因的表达。     

海南热带花卉产业现状调查报告

海南省花卉市场发展动态、走向，公司和主要种植品种情况、销售情况及现阶段主要存在问题等。录调查信息，最后对发展海南花卉产业中存在的问题提出了建议，花卉产业的生产、贸易、消费的现状进行描述，并对我国花卉产业发展前景进行分析。