武汉设施蔬菜尾菜资源化利用现状及对策

基于设施蔬菜在蔬菜产业中的主导地位,分析武汉设施蔬菜生产现状、尾菜资源化利用现状及存在的问题,并提出加强宣传、建立尾菜资源化利用技术体系、制订扶持政策、建立长效机制的发展对策,为有效开展设施蔬菜尾菜资源化利用提供参考.     

2012年春季塔克拉玛干沙漠腹地沙尘颗粒的组成研究

为研究塔克拉玛干沙漠腹地沙尘颗粒的微观形貌及其矿物、元素组成,应用扫描电镜能谱技术(SEM/EDX)对塔克拉玛干沙漠腹地塔中观测站2012年5月采集的PM10样品进行了识别和分析。统计622个单颗粒高分辨电镜图像及能谱的结果表明:塔克拉玛干沙漠大气PM10主要来源于地壳矿物。其中,矿物组成主要是石英、粘土矿物、方解石、岩盐,特别是岩盐含量高达14.5%,石英、方解石、石膏、岩盐单体矿物相对含量较高,但大部分都以矿物集合体的形式存在,与其它人为源颗粒物的混合主要是外混合。不同天气类型下,其矿物组成差异明显,重矿物(岩盐等)主要来源于强风就地扬起或携带的较粗颗粒。     

鹅源草酸青霉产果胶酶对肥胖模型大鼠体重、脂肪沉积及脂质代谢的影响

本试验旨在研究鹅源草酸青霉产果胶酶对肥胖大鼠体重、脂肪沉积及脂质代谢影响。随机选取雄性大鼠108只,体重220~240 g,适应性饲养3 d。分为对照组(Ⅰ组)、高脂组(Ⅱ组)和高脂模型组;高脂模型组造模成功后,将其按体重随机分为7组,每组3个重复,每个重复4只;各组在基础饲粮中分别添加0(Ⅲ组)、0.01%(Ⅳ组)、0.05%(Ⅴ组)、0.1%(Ⅵ组)、0.2%(Ⅶ组)、0.4%(Ⅷ组)、0.8%(Ⅸ组)的果胶酶。试验期8周。结果表明:1)鹅源草酸青霉产果胶酶能够有效抑制肥胖模型大鼠体重的增长,降低Lee’s指数,控制体型发育。2)鹅源草酸青霉产果胶酶能够降低肥胖模型大鼠机体脂肪沉积量。3)鹅源草酸青霉产果胶酶能够有效地对肥胖模型大鼠由于摄入高脂饲粮引起的脂肪肝进行干预,使其恢复到正常水平。4)鹅源草酸青霉产果胶酶能够降低肥胖模型大鼠血清总胆固醇、甘油三酯、低密度脂蛋白胆固醇、游离脂肪酸含量,提高血清高密度脂蛋白胆固醇含量。5)鹅源草酸青霉产果胶酶能够降低肥胖模型大鼠谷丙转氨酶和谷草转氨酶活性,提高血清脂蛋白酯酶和肝酯酶活性。由此可见,鹅源草酸青霉产果胶酶对肥胖模型大鼠脂肪沉积和脂质代谢具有显著干预修复作用,降脂效果明显。     

基于J2EE的Web Data Window交互模型设计

Web中的数据窗口是采用事件驱动模型实现浏览器和服务器之间数据交互,客户端和服务器都采用事件驱动模型,采用RDF对事件驱动进行描述。事件驱动模型可以实现数据局部更新,提高数据传输效率。     

Physiological but not morphological adjustments along latitudinal gradients in a human commensal species,the Eurasian tree sparrow

Human commensal species take advantage of anthropogenic conditions that are less likely to be challenged by the selective pressures of natural environments. Their morphological and physiological phenotypes can therefore dissociate from habitat characteristics. Understanding how these species adjust their morphological and physiological traits across latitudinal gradients is fundamental to uncovering the eco-physiological strategies underlying coping mechanisms. Here, we studied morphological traits in breeding Eurasian tree sparrows (ETSs; Passer montanus) among low-latitude (Yunnan and Hunan) and middle-latitude (Hebei) localities in China. We then compared body mass; lengths of bill, tarsometatarsus, wing, total body, and tail feather; and baseline and capture stress-induced levels of plasma corticosterone (CORT) and the metabolites including glucose (Glu), total triglyceride (TG), free fatty acid (FFA), total protein, and uric acid (UA). None of the measured morphological parameters varied with latitude except in the Hunan population, which demonstrated longer bills than those in other populations. Stress-induced CORT levels significantly exceeded baseline levels and decreased with increasing latitude, but total integrated CORT levels did not vary with latitude. Capture stress-induced significantly increased Glu levels and decreased TG levels, independent of site. However, the Hunan population had significantly higher baseline CORT, baseline and stress-induced FFA levels, but lower UA levels, which differed from other populations. Our results suggest that rather than morphological adjustments, physiological adjustments are mainly involved in coping mechanisms for middle-latitude adaptation in ETSs. It is worth investigating whether other avian species also exhibit such dissociation from external morphological designs while depending on physiological adjustments.     

Wavelet Edge Detection Method Based-on Multi-scale Fuzzy Logic

A novel edge detection algorithm is proposed by implementing fuzzy image enhancement at different scales.The implement of this algorithm can reduce the negative influence bring from the non-maximum suppression algorithm which select only one threshold.The success of the approach depends on the selection of a general fuzzy operator(GFO) for the enhancement of contrast of region after smoothing of image at different scales.Consequently,it is more obvious that coarse intensity changes are obtained at a large scale whereas the fine details of intensity changes are obtained at a small scale.A pretty performance is obtained by used this work.     

区域经济系统的分形特征及模型研究

通过对区域经济系统模型的研究,确定了经济系统的分形特征,并通过实例建立投入与产出的数学模型,验证了其分形特征,利用分维确定了各投入与产出量的变化趋势,揭示了区域经济系统的复杂变化,为了解和指导区域经济发展提供了新的方法和依据。     

车辆发动机气门弹簧的设计方法探讨

发动机气门弹簧多用圆柱形螺旋压缩弹簧,在气门关闭过程中用于克服气门及传动件的惯性力,保证气门及时落座并紧密贴合,防止气门在发动机振动时产生跳动。本文通过分析其优化设计的设计变量、目标函数和约束条件,提出并验证优化设计的数学模型,该方法简便易行,且可以达到预期的设计目的。