影响我国男子篮球防守问题的探讨

通过观看我国男篮的比赛,查阅大量的文献资料,对影响我国男篮防守的几个因素进行分析研究,并提出合理化建议.在篮球防守的理念发生重要转变的情况下,影响我国男子篮球队防守的主要因素包括球员自身条件、防守的技战术水平、规则用裁判、精神气质与心理等各个方面.     

Cardenolide glycosides from the adults and eggs ofChrysolina fuliginosa (Coleoptera: Chrysomelidae)

Besides the known sarmentogenin 3-O--D-allopyranoside (1) and digitoxigenin-3-O-[-D-xylopyranosyl-(14)-2, 3-di-O-acetyl--D-allopyranoside] (4), four new cardiac glycosides (2, 3, 5 and6) have been isolated from the defensive glands of adults ofChrysolina fuliginosa. The structures of the new compounds were determined by¹H NMR at 600 MHz and FABMS. Compounds1–6, present in the adults ofC. fuliginosa, have also been identified in the eggs.     

悬板式防爆波活门关闭风量机理

针对工程中悬板活门应用和空气流动作用理论研究的不足,建立了悬板活门动作力学模型和空气流动动力学模型,并通过关闭风量方程组加以求解,得到了悬板活门的动作规律和空气流动特性。分析了悬板式防爆波活门关闭风量和通风特性与活门结构参数变化的内在联系。选择3个规格的悬板活门,测量其关闭风量,将理论值与测量值进行比较,计算偏差。结果表明,根据方程组计算的关闭风量与实测风量的偏差较小,均在10%内,且随着活门规格的增加,此偏差逐渐降低,理论与实际情况趋于吻合。     

普通高校国防生学风建设探究

随着国防生数量的增加,国防生培养工作中存在的问题日益凸显,因此,探索并完善国防生培养中学风建设的有效措施有其重要意义.结合国防生管理工作的具体实践,本文就当前国防生培养工作中存在的问题、国防生学风现状和学风建设的重要性进行了探索性研究,并提出了加强国防生学风建设的相关措施.     

姚明在NBA比赛中的攻守技术分析

通过查阅资料、观看NBA赛场姚明在比赛中攻防的主要技术表现,并对其在比赛中存在的主要问题进行了分析.     

相变材料技术在国防工程内部电站余热利用中的应用

国防工程内部电站余热处理是发电机组正常运行的重要保证。利用国防工程内部相变蓄热站来吸收、储存发电机组产生的余热,能够在与外界无热交换的情况下,较好地解决电站降温和热能回收再利用问题,对国防工程内部电站排烟口伪装具有重要意义。     

Sound production in primitive Orthoptera from Western Australia: sounds used in defence and social communication in Ametrus sp. and Hadrogryllacris sp. (Gryllacrididae: Orthoptera)

Sound production in two undescribed species of Gryllacrididae belonging to the genus Ametrus sp. and Hadrogryllacris sp. takes the form of defensive stridulation and intra-specific signalling by drumming on the substrate. Defensive stridulation is produced as part of an elaborate visual display, by femoro-tergal stridulation. Two rows of spines on abdominal tergites II and III of both species are rubbed by an elongate area of tubercules on the inner femoral surface of the hind legs. Analysis showed that the motion of the leg relative to the abdomen involves a complex counter-rotation of the leg between leg and abdomen. The defensive display may be performed in day light. Social signalling in both species occurs after dark, and involves drumming on the substrate by both hind legs in loose synchrony. Drumming is rhythmic and species' specific. Males respond to playback calls and females duet with males. The evolution of this calling behaviour is discussed and comparisons are made with the other primitive ensiferan family known to produce both tergo-abdominal defensive stridulation and femoral drumming behaviour, the Stenopelmatidae.     

Potential host range of myrmecophilous Arhopala butterflies (Lepidoptera: Lycaenidae) feeding on Macaranga myrmecophytes

“Plant-ants”, i.e. those symbiotic with myrmecophyte plants, defend their hosts against herbivores. Plant-ants are expected to affect the host-plant ranges of herbivores that feed on myrmecophytes. This study aimed to experimentally determine whether anti-herbivore defences by plant-ants restrict the larval host-plant ranges of four Arhopala (Lycaenidae) butterflies that feed on Macaranga (Euphorbiaceae) trees, some of which are myrmecophytes. We fed Arhopala larvae with the leaves of five Macaranga species under ant-excluded conditions to examine their potential host-plant ranges. Under ant-excluded conditions, three Arhopala species survived to the pupal stage when fed species not used in the field as well as their normal host species. Our data suggested that the aggressive behaviours of plant-ants towards leaf-feeding insects restrict the potential host-plant ranges of some Macaranga-feeding Arhopala butterflies.     

Dark axils and nodes in various plant species may serve as defensive mimicry of beetle and beetle faeces

Anti-herbivory animal mimicry by plants has been paid scant attention, and as a result additional types are expected to be recognized. Lycium chinense plants growing in Japan have dark axils, and many leaf-eating beetles leave faeces on host plants or use their faeces as defence. The dark axils of Lycium chinense mimic poisonous faeces or faeces-covered larvae of the leaf beetle Lema decempunctata, which may result in reduced herbivory by mammalian and insect herbivores. Field work in the very different flora of Israel revealed that the same morphology/colouration exists in various wild plant species, both monocotyledons and dicotyledons. We therefore propose a new type of beetle and beetle faeces defensive plant mimicry, and suggest that this type of putative defensive mimicry against mammalian and insect herbivores is probably a widespread but overlooked phenomenon. Moreover, such mimicry may also attract visually oriented enemies that can attack various invertebrate herbivores that occupy these plants.     

软岩地基爆破震动测试及防震措施

报告了西南科技大学水处理厂软岩地基开挖爆破的地震测试结果，并介绍了地基爆破的边坡安全防护问题。