含附件文本的分类算法研究

针对含附件文本利用率低的缺陷,为了提升附件文本分类的查全率和查准率,从两个不同角度分别提出了基于密度的BP神经网络附件文本分类算法,对组织中带有附件的文本分类进行改进.实验表明,算法在一定程度上提高了含附件文本的利用率.     

卧推练习与实心球练习对篮球中双手长传球距离的影响

以山东体育学院篮球队12名队员为实验对象,通过实验比较卧推练习与实心球练习对长传球距离的影响,以加深对篮球长传球技术特性、本质的认识与理解,以获得有益的借鉴和启示。结果显示,为期12个周的力量训练后,无论在远度方面,还是在短传快攻的时间及3分外围短传时间方面实心球练习的效果都显著优于卧推练习。实心球练习手段是结合专项的力量素质练习,能有效地提高双手胸前传球的远度与速度,为短传、长传快攻的成功打下良好的基础。建议在今后的训练中将实心球训练纳入篮球专项训练之中。     

与局部密度相关的Dirichlet级数的性质

Siegel-Eisenstein级数是研究Siegel模形式的重要工具,本文讨论由次数为n的Sigel-Eisenstein级数衍生出的两个Dirchlet级数的性质,这两个级数均和局部密度有关.这里,作者给出一个级数的显示公式和给出另一个级数的模性质.     

四川山鹧鸪生态习性研究进展

四川山鹧鸪（Arborophila rufipectus）是中国西南山地特产珍稀鸟类。由于亚热带阔叶林的破碎化,其种群数量显著下降,故对其生态习性概括既具有理论意义,又具有保护价值。该文基于近10年的大量相关资料,综述了四川山鹧鸪生态习性研究的最新情况,全面介绍了物种的地理分布情况、种群数量、对栖息地的利用、繁殖特征、鸣声特征和保护地位,并对该领域今后应进行的研究提出了建议。     

Electromagnetic effects on the biological tissue surrounding a transcutaneous transformer for an artificial anal sphincter system

This paper reports on the electromagnetic effects on the biological tissue surrounding a transcutaneous transformer for an artificial anal sphincter. The coupling coils and human tissues, including the skin, fat, muscle, liver, and blood, were considered. Specific absorption rate (SAR) and current density were analyzed by a finite-length solenoid model. First, SAR and current density as a function of frequency (10–10⁷ Hz) for an emission current of 1.5 A were calculated under different tissue thickness. Then relations between SAR, current density, and five types of tissues under each frequency were deduced. As a result, both the SAR and current density were below the basic restrictions of the International Commission on Non-Ionizing Radiation Protection (ICNIRP). The results show that the analysis of these data is very important for developing the artificial anal sphincter system.     

基于LDPC码与置乱变换的数字水印算法设计

提出了一种新的数字水印算法,该算法将LDPC码和图像置乱变换相结合,能实现水印盲提取.实验表明,该算法提高了数字水印算法的稳健性.此外图像置乱实现了对水印图像和载体图像的加密.     

基于社会网络理论的泛在图书馆分析

运用社会网络理论研究泛在图书馆是一种全新的视角。作为一种现实存在的实体,强弱联结、网络位置和密度、社会资本是它的三大核心理论。文章分别从这三方面来研究泛在图书馆,以便更好地构建泛在图书馆。     

阿昔洛韦的药理活性量化方法探究

选择B3LYP／6—311＋G（d,p）方法对阿昔洛韦进行了量子化学计算,对其分子构型、偶极矩、疏水参数、红外光谱、自旋密度分布和前线轨道结构进行了详细探究。结果表明,阿昔洛韦能发挥较好的抗氧化作用,模拟计算获得N（3）—H的活性最强。它在体内极性较大的环境下能发挥很好的吸收效果,研究结果可为阿昔洛韦的药理活性提供理论指导。     

磁场中旋转圆柱导体内电场及电荷分布

金属圆柱导体在匀强磁场中分别绕对称轴和垂直于对称轴的轴转动时,推导出电场和电荷密度的表达式,研究表明电荷密度与角速度有关与旋转半径无关,电场的大小正比于旋转半径.     

Hierarchical self-localization of underwater wireless sensor network nodes

The follow-up application of underwater wireless sensor network is influenced by accuracy of self-localization of nodes. The self-localization of nodes is discussed in this paper. First of all, nodes of underwater wireless sensor network are classified into several levels according to the accuracy of position of nodes and the levels are from the first to the fifth in accordance with accuracy of nodes from high to low respectively. Secondly, the level of anchor nodes can be known by those unknown nodes from the information given by the anchor nodes themselves, At the same time the unknown nodes are able to be located in the area controlled by the first level of anchor nodes that are as the aggregation. Then the positioning algorithm is designed correspondingly in accordance with the accuracy level of nodes. Finally, the positioning algorithm is simulated and analyzed. The result shows that the unknown nodes can be located effectively by hierarchical control.