固定化营养剂与人工生态灶

生态系统研究是现代生态学的主要内容之一,水产养殖实际上是一个人工生态系统.在养殖水域生物群个体数量最大限度地增加时,大尺度海流和岸流到达养殖区域的营养盐不能满足生物生活的需要.因此,能否控制住营养盐便成了养殖成败的关键.固定化营养剂是一种理想的肥料,它可以用于局部施肥,达到高效利用的目的.由固定化营养剂制成的人工生态灶可为植物提供营养,也可为动物提供饵料,且可根据使用目的的不同而调整营养成分.     

《道德经》对高等学校管理的启示

本文从无为而治、人本管理、柔性管理、创造安定团结的学校环境、领导者的个人能力和修养五个方面分析《道德经》对高等学校管理的借鉴作用。     

神经网络处理平面图着四色问题的研究

以Ｈｏｐｆｉｅｌｄ神经网络为基础，提出一种网络模型，可以正确处理平面图着四色问题，它具有结构简单，连接规则，容错性强等优点，并可用电子电路实现，在各个神经元外加激励稍有不同或网络连接权值有偏差的情况下可以得到正确输出，用两种途径进行仿真，其结果与理论分析相吻合。     

Experimental study on load bearing behavior of large scaled caps with pile groups

The objective of this investigation was to study the behavior of deep pile caps and the ultimate load-carrying capacity. Four 1/10 scaled models of nine-pile caps were cast and tested on vertical loads to failure. The destruction shapes of pile caps,the correlation between load and displacement,and the internal stresses were analyzed systematically. The results demonstrated that the failures of all the four models are resulted from punching shear; the internal flow of the forces in nine-pile caps can be approximated by ＂strut-and-tie＂ model. Furthermore,the failure loads of these specimens were predicted by some of the present design methods and the calculated results were compared with the experimental loads. The comparative results also indicated that the ＂strut-and-tie＂ model is a more reasonable design method for deep pile caps design.     

Investigation on regenerator temperature inhomogeneity in Stirling-type pulse tube cooler

Regenerator is one of the most crucial components to pulse tube cooler (PTC) and thermoacoustic engine. As such regenerator is scaled up to high-power, the thermal and hydrodynamic communication transverse to the acoustic axis gets weaker and weaker. Under this condition, any unsymmetric factor could cause serious instability to the cooler or engine, which degrades their performance. Investigation has been carried out on a high-power two-stage thermal-coupled U-shape Stirling-type PTC. By detailed circumferential temperature measurements along the middle heat exchanger and second stage regen-erator, a kind of temperature inhomogeneity caused by unsymmetric pre-cooling effect of inter-stage thermal bridge was found in the lower part of the regenerator of the PTC. The temperature inhomoge-neity originating from the middle heat exchanger of the second stage regenerator amplified itself in the lower part of the regenerator and then internal streaming formed. The maximal radial temperature dif-ference could reach 30―40 K. Experimental results show that the temperature inhomogeneity intensi-fies with increased pre-cooling power and its direction can be reversed by changing the pre-cooling effect of the first stage PTC to heating effect by using external thermal load. This research shows that it is important to maintain the heating or cooling effects of heat exchangers uniform in high-power re-generative coolers and engines.     

4L3A型自走式谷物联合收割机设计研究

针对目前国内中小型自走式谷物联合收割机中存在的问题，对影响脱粒、分离、清选等关键部件性能的因素进行分析研究，并重新设计计算，提出改进方案，进行对比试验，同时注重整机设计的完整性；在此基础上，开发设计出一种新的4L3A型自走式谷物联合收割机，大大提高了自走式谷物联合收割机的工作能力和性能指标。     

Regulation of BMP4 on the proliferation and differentiation in SVZa neural stem cells

The neural stem cells in the anterior subventricular zone (SVZa) mainly generate the progenitors that will differentiate into neurons, and along a highly circumscribed migratory access Rostral migratory stream (RMS), they migrate to the olfactory bulbs (OB). To understand the effects of BMPs on SVZa neural stem cells, in this study BMP4 at various concentrations was used to induce SVZa neural stem cells, and the living cell labeling using BMP4 promotor conjugated with red fluorescence protein showed the expression of BMP4 dynamically. The results demonstrated that low BMP4 doses (1-5 ng/mL) promoted while high doses (10-100 ng/mL) inhibited the proliferation of SVZa neural stem cells, and BMP4 promotedneuron differentiation in the early stage (1-3 d), howeverm, it inhibited the neuron commitment after 4 d. Noggin, the antagonist of BMP4, blocked the physiological effects of BMP4. In OB, BMP4 is mainly to accelerate the progenitors to withdraw from the cell cycle and trigger the differentiation, and in RMS, it promotes the proliferation of committed progenitors and not differentiation, further in SVZa, BMP4 enhances astrocyte commitment.     

惠民凹陷临盘油田沙二下亚段储层成岩演化

通过取心井的岩心观察和室内分析，结合沉积微相的研究，探讨了临盘油田沙二下亚段成岩作用特点，建立了滩坝沉积的埋藏成岩演化模式．通过研究认为，尽管沙二下亚段埋藏较浅，但成岩作用已达到晚成岩Ａ１期，储层总体上处于弱压实、弱胶结状态，次生孔隙较发育．由于沉积和成岩作用的共同影响，处于原始高位的坝顶砂岩为较好的油气储层．     

一类联想神经网络的计算机模拟实现

本文讨论了一类联想神经网络的综合方法，给出了计算机实现网络综合的算法程序流程图及网络综合实例，计算机模拟结果表明，综合出的网络在模式联想记忆中得到的结果与理论分析完全相吻合。     

基于人均建设用地指标法的农村居民点整理潜力测算及效益分析?——以石柱土家族自治县为例

基于乡村聚落地理理论,以石柱土家族自治县为例,采用人均建设用地指标法测算农村居民点整理潜力,根据测算结果进行潜力分级,最后对其效益定性分析。结果表明:以石柱县经济发展及丘陵山区的现状为基础,计算农村居民点土地整理潜力可以有效增加164.31 hm2耕地;其中西南片区最具整理潜力,下路镇整理潜力最大为45.65 hm2。