基于RFID技术的景区流量导向系统

基于RFID技术的景区流量导向系统能通过技术应用,依靠阅读器收集到标签内的信息来判断景区的各个景点的人流情况,并通过网页查询、电子显示屏和广播等方式告知游客各景点的游客饱和度信息,对游客的流量趋向进行指引,保证游客在每个景点都可以畅通愉快的游玩。     

Dynamic equivalent method of interconnected power systems with consideration of motor loads

The existing equivalent methods usually only deal with static load models and neglect the dynamic characteristics of loads such as induction motors.This paper presents a dynamic equivalent method which considers motor dynamics.At first,the clustering criterion of motor loads is given.The motors with similar dynamic characteristics are classified into one group.Then,reduction of motors in the same group is carried out.Finally,parameters of the equivalent motor are calculated and the equivalent system is thus...     

地震信息中富水特性的分析

地震勘探取得的地震资料中包含了丰富的地质信息,目前地震资料主要用于解决地质构造问题,其中蕴含的水和瓦斯等岩性信息没有得到充分利用.针对某矿勘探地震资料包含富水信息的反演成果与瞬变电磁法的探测范围及钻孔水文资料标定分析成果进行联合对比分析,吻合性较好.由此可见,从地震资料中提取富水信息是可行的,在实际运用中不仅为矿方提供更为准确的水文地质资料而且也节省了成本,取得了较好的经济效益.     

高速冷滚打成形金属流动仿真分析

为了揭示高速冷滚打成形中工件金属流动规律,基于高速冷滚打原理得到了滚打轮与工件由点接触到线接触最后为面接触的变化过程,依据最小阻力定律分析了各个阶段的金属流动规律;根据渐开线花键冷滚打的加工工艺,建立了有限元分析模型,对高速冷滚打过程进行了仿真,分析了冷滚打不同时刻的等效应变状况,分析了接触面上一组节点在冷滚打过程中的流动轨迹,给出了节点的流动规律,对比分析了仿真分析与理论分析结果.     

复合钢管混凝土轴压柱承载机理分析

基于混凝土的塑性损伤模型对外方内圆型复合钢管混凝土柱轴压试件的承载机理进行研究,对比了复合钢管混凝土柱和单钢管混凝土柱在加载过程中横截面上混凝土的纵向应力分布规律,揭示了该组合构件的承载机理:复合钢管混凝土柱中核心混凝土受到内外层钢管的双重约束作用,因此,核心混凝土的轴向应力比单钢管混凝土柱的纵向应力大,极限承载力也随之增大;但夹层混凝土的纵向应力与单管混凝土纵向应力两者相差不大;在此基础上分析钢管壁厚及混凝土强度等级等参数对复合柱力学性能的影响.     

Extraction and separation of Ga(Ⅲ) and T1(Ⅰ) or In(Ⅲ) and T1(Ⅰ) from chloride media with CA-12 in sulphonating kerosene

The extraction behavior and mechanism of gallium(Ⅲ) and thallium(Ⅰ) or indium(Ⅲ) and thallium(Ⅰ) with Sec-octylphenoxy acetic acid (CA-12) from hydrochloric acid solution in sulphonating kerosene were studied. Optimum extraction conditions were evaluated from critical study of various experimental parameters and the probable composition of the extracted species is ascertained from lg D-lg C plots. The effects of different ions on the determination of these ions were examined.     

基于分辨矩阵和约简树的增量式属性约简算法

为了对动态变化的决策表进行高效属性约简处理,在改进的分辨矩阵的基础上提出一种基于约简树的增量式属性约简算法IRART,该算法首先根据序贯属性约简算法对原决策表构造约简树,然后求出新增对象的分辨向量,并利用此向量对约简树进行修整,从而快速得到新决策表的所有约简,最后通过示例证明了这种算法的有效性。与传统增量式属性约简算法相比,该算法避免了复杂的逻辑演算,提高了属性约简的更新效率,理论分析表明该算法是有效可行的。     

计算机层次分析法的图像判读研究

运用AHP和聚类分析法对图像判读决策进行了定量与定性研究,在判读人员主观判断的基础上,获取评估结果并对这些数据做出分析。     

MoS2势垒层磁性隧道结的温度-偏压特性研究

MoS₂是一种具有特殊能带结构的二维半导体材料,当层数较少时,其带隙会随层数显著减小。因此,基于MoS₂势垒层的磁性隧道结会展现出更丰富的物理特性。文章通过理论计算分别得到了单层、双层、三层以及五层MoS₂势垒层磁性隧道结的温度-偏压相图,研究了铁磁电极半交换劈裂能对相图特性的影响。计算结果表明：单层和三层MoS₂势垒层磁性隧道结适合应用于低温器件中。其中,单层MoS₂势垒层磁性隧道结在高功率工作环境下具有优异的性能。双层MoS₂势垒层磁性隧道结的优化区域位于室温和低偏压区,因此适用于信息存储领域。五层MoS₂势垒层磁性隧道结可通过调节铁磁电极参数使其工作在较宽的功率范围内。上述研究结果为MoS₂势垒层磁性隧道结的应用奠定了坚实的理论基础。     

Application potential of bone marrow mesenchymal stem cell (BMSCs) based tissue-engineering for spinal cord defect repair in rat fetuses with spina bifida aperta

Spina bifida aperta are complex congenital malformations resulting from failure of fusion in the spinal neural tube during embryogenesis. Despite surgical repair of the defect, most patients who survive with spina bifida aperta have a multiple system handicap due to neuron deficiency of the defective spinal cord. Tissue engineering has emerged as a novel treatment for replacement of lost tissue. This study evaluated the prenatal surgical approach of transplanting a chitosan–gelatin scaffold seeded with bone marrow mesenchymal stem cells (BMSCs) in the healing the defective spinal cord of rat fetuses with retinoic acid induced spina bifida aperta. Scaffold characterisation revealed the porous structure, organic and amorphous content. This biomaterial promoted the adhesion, spreading and in vitro viability of the BMSCs. After transplantation of the scaffold combined with BMSCs, the defective region of spinal cord in rat fetuses with spina bifida aperta at E20 decreased obviously under stereomicroscopy, and the skin defect almost closed in many fetuses. The transplanted BMSCs in chitosan–gelatin scaffold survived, grew and expressed markers of neural stem cells and neurons in the defective spinal cord. In addition, the biomaterial presented high biocompatibility and slow biodegradation in vivo. In conclusion, prenatal transplantation of the scaffold combined with BMSCs could treat spinal cord defect in fetuses with spina bifida aperta by the regeneration of neurons and repairmen of defective region.