赤桉树叶脂肪酸的定量分析

植物不饱和脂肪酸的含量与植物的抗寒性具有相关性．以赤桉为实验对象．研究了植物叶片用CHCl3和CH3OH混合溶剂浸提、十五酸为内标、KOH-CH3OH-BF3酯化、硅胶脱色、气相色谱定量分析植物叶片中脂肪酸的方法．结果表明：在赤桉树叶中未检出十四酸，检出了棕榈酸、棕榈油酸、硬脂酸、油酸、亚油酸和亚麻酸;各种脂肪酸的相对响应因子分别为1．000、0．8879、1．000、0．8675、0．7531和0．5314，相对响应因于的线性值分别为0．9997、0．9979、0．9994、0．9978、0．9967和0．9945．相对标准偏差分别为2．45％、4．00％、3．22％，2．66％、2．40％和1．57％，回收率分别为96．90％、107．40％、98．65％、91．25％、94．15％和92.50％）各种脂肪酸相应的相对响应因子的线性相关系数都在0．99以上，相对标准偏差〈5．0％，回收率在85％～110％之间，满足微量成分的定量分析要求。     

输气管道内涂层的生产质量控制

介绍了输气管道内涂层的生产工艺和质量控制，指出要获得高质量的减阻内涂层，必须严格控制其生产过程的每一道工序，包括原材料检验、原材料使用配制、钢管预处理和喷涂后的质量检验，并且保证每项检测内容必须符合相关指标所规定的要求。     

石拱桥拱脚开裂过程中的内力分析

采用空间梁单元对实际的石拱桥拱脚开裂现象进行了有限元模拟分析。随着开裂深度的变化，主拱圈中的内力进行重新分配，得出了不同开裂深度时主拱圈中的内力分布规律，对实际的各种受力状态和开裂过程中的内力进行了较精确的数值描述。当拱脚裂纹扩展时，拱脚截面上的弯矩明显减小，轴力明显增大，而其它截面上的弯矩增大，轴力也增大，截面上的内力值与开裂深度成非线性关系。     

小流域水土保持生态经济系统内外部效益评价

小流域生态经济系统在实施一定的水土保持措施以后，所产生的效益可划分成两个部分。其中一部分效益作用于流域界线以内，受益人为流域的内部使用者，我们称之为内部效益；而另一部分效益作用于流域界线以外，受益人为流域资源的外部使用者，我们称之为外部效益。本文分别采用综合环境生产力指数法和效益系数法研制开发小流域内外部效益评价模型，从而对流域治理过程中两种效益的变化进行评价。     

农户亲环境行为动机拥挤效应检验——来自云南省1050份农户调研证据

农户实施亲环境行为是改善生态环境,促进农业可持续发展的重要途径,而动机作为行为的先导,会直接影响行为轨迹。文中以行为经济学为切入点,结合认知评价理论、自我决定理论、动机拥挤理论分析农户亲环境行为的内外动机及其交互作用机理,采用分层回归和Bootstrap法对云南省1050份调查数据进行检验。结果表明:外部动机与内部动机单项效应都显著促进农户亲环境行为,且外部动机中货币激励影响效应更大、内部动机中道德责任感影响效应更大。内外动机间存在"拥挤效应",货币激励"挤出"道德责任感、非货币激励"挤入"兴趣愉悦感,交互总效应表现为"挤出效应"。     

A mechanical study on the mitigation of lodging in edible canna

Because edible canna is approximately 3-m tall in its latter growth stage, strong winds such as by typhoons can induce plant lodging and cause severe damage to it. To improve our previous estimations that the 1-m dwarfing of a plant mitigated 10–20% by strong wind (external force) and 50% by own weight (internal force), respectively, we re-examined these parameters in relation to rhizome yield for field-grown plants. From early middle growth stage (July–August) of edible canna, the perpendicularly projected area of above-ground biomass increased rapidly due to rapid shoot elongation. After the middle growth stage (September), the stock base radius increased and shoot inclination angle decreased until the latter growth stage (November) gradually, indicating a disturbed architecture and easy lodging. Throughout the growth period, we observed no radial, directional difference in the leaf area distribution. Increase in the distance between the ground surface and the center of gravity of shoot weight and decrease in the shoot inclination increased the components of the internal force. The easiness to fall down (percentage own-weight invasion moment) of plant became maximal in the latter growth stage. We conclude that approximately 50-cm dwarfing of the plant with minimal loss of rhizome yield (as low as approximately 20%) and the maintenance of lodging tolerance is optimal. In such a situation, both external and internal forces are mitigated by approximately 30%.     

军工企业存货管理问题及对策研究

文章浅析了航天军工企业存货管理的问题,剖析了内在原因,并提出了从管控意识、内部控制和考评机制角度改善的建议。     

T型管内高压成形的应用研究

管材内高压成形技术是一种节能减材、前景应用广泛的空心轻体件新型制造技术,该技术一出现就受到了广泛的关注。文中主要阐述了T型管内高压成形的成形原理及其特点,同时还深析了T型管内高压成形技术的在国内外的研究状况。     

轴向腐蚀缺陷宽度对管道极限内压荷载的影响

针对海底管道的中高强度钢腐蚀极限内压预测问题，采用有限元弹塑性分析方法，考虑材料非线性和几何非线性，建立非线性分析模型并与试验数据进行对比分析，验证了有限元模型的合理性和准确性。基于有限元计算结果分析得出腐蚀深度、腐蚀长度及腐蚀宽度对海底管道极限内压的影响，并回归得到了适用于轴向腐蚀管道极限荷载的计算公式。通过与腐蚀管道爆破试验数据和现有腐蚀管道计算方法的比较分析，验证了该方法能够得到较准确的结果，可为海底腐蚀管道在内压荷载作用下的评估提供一定的依据。     

Effects of Compounded Plant Feed Additives on the Growth Performance,Immune Function and Morphology of Internal Organs and Tissues in Yellow-feathered Broilers

The present study was aimed to study the effects of plant additives on growth performance, immune function and morphology of internal organs and tissues in Yellow-feathered broilers. 400 Yellow-feathered broilers at 10-day-old were divided into 4 groups. The broilers in control group were fed with basal diets, while in experimental group A,B and C were fed with basal diets added 3,5 and 8 g/kg plant additives, respectively. Each group had 10 replicates (10 birds per replicates), and the experiment lasted for 50 d. The results showed that group C got the best experimental results of all groups:ADG increased by 5.53% (P<0.05), F/G was decreased by 6.11% (P<0.05), the survival rate was increased by 2.16%(P<0.05), and immune organ index, duodenal villous length and serum antibody titer were significantly increased (P<0.05) compared with the control group. All the experimental groups supplemented with the plant additives could enhance development of the duodenum, liver and kidney, and NDV antibody titer. In conclusion, adding the plant additives in the diet could improve the growth performance, immune function and development of internal organs in Yellow-feathered broilers, and the recommended amount was 5 g/kg.