Non-Uniform APSK Optimization for BICM Systems

Traditional Amplitude Phase Shift Keying(APSK) consists of rings with points uniformly spaced. By giving up this uniform-spacing feature, we propose an APSK optimization method based on the uniform APSK with Gray labeling(Gray-APSK). The aim of the optimization is to maximize the Generalized Mutual Information(GMI)of Bit-Interleaved Coded Modulation(BICM) for the targeted code rate and channel. We show that our optimized non-uniform APSK could offer further performance gain compared with the conventional uniform Gray-APSK and considerably outperforms the traditional quadrature amplitude modulation at the targeted SNR and channel.     

我国奥运会金牌走向及项目分布特征研究

运用文献资料、数据统计、归纳比较、聚类分析方法,对我国历届夏季奥运会和冬季奥运会金牌数、金牌项目分布以及获金牌运动员特征进行了研究,结果表明:我国共获得210枚奥运金牌,其中9枚冬季奥运会金牌,201枚夏季奥运会金牌,金牌总数呈上升趋势;辽宁、广东、湖北、北京与江苏等省市位列金牌榜前五位,新疆、青海、宁夏、海南、西藏、甘肃6省未获得奥运金牌;金牌项目主要集中在跳水、举重、体操、乒乓球、羽毛球、射击和短道速滑;技能主导类项群是我国奥运金牌的主要贡献者,尤其是表现难美性项目,其金牌贡献率达到30%;奥运金牌项目的区域分布呈现出强、较强和弱3个地带,不同纬度与经度的分布差异具有统计学意义,东西部竞技实力差距明显;女子获奥运金牌数多于男子,但"阴盛阳衰"的局面已在悄然改变.     

Secure Two-Party Distance Computation Protocol Based on Privacy Homomorphism and Scalar Product in Wireless Sensor Networks

Numerous privacy-preserving issues have emerged along with the fast development of the Internet of Things. In addressing privacy protection problems in Wireless Sensor Networks(WSN), secure multi-party computation is considered vital, where obtaining the Euclidian distance between two nodes with no disclosure of either side’s secrets has become the focus of location-privacy-related applications. This paper proposes a novel Privacy-Preserving Scalar Product Protocol(PPSPP) for wireless sensor networks. Based on PPSPP, we then propose a Homomorphic-Encryption-based Euclidean Distance Protocol(HEEDP) without third parties. This protocol can achieve secure distance computation between two sensor nodes. Correctness proofs of PPSPP and HEEDP are provided, followed by security validation and analysis. Performance evaluations via comparisons among similar protocols demonstrate that HEEDP is superior; it is most efficient in terms of both communication and computation on a wide range of data types, especially in wireless sensor networks.     

反相高效液相色谱法测定化妆品中的酮麝香

 酮麝香是化妆品中的限用物质,对人体有致癌作用,因此,有必要对其含量进行分析。采用超声辅助提取法对不同基质类型的化妆品样品进行预处理。利用反相高效液相色谱法测定化妆品中的酮麝香。色谱条件为Kromasil C₁₈(250mm×4.6mm i.d.,5μm)色谱柱,流动相V(乙腈):V(水)= 80:20,流速1.0mL/min,检测波长235nm。结果表明,在此条件下,酮麝香在0.5-150 μg/mL范围内与相应的峰面积具有良好的线性关系(相关系数r为0.9998),线性回归方程为A=13500ρ-4829,回收率为90.5%-102.5%,RSD为0.45%-0.98%。因此,研究建立的利用反相高效液相色谱法测定化妆品中的酮麝香的方法准确、可靠、适用性广,可为酮麝香的分析及国家相关法规的制定提供一定的参考。     

Magnetocaloric effect in Er-Al-Co bulk metallic glasses

A series of Er-Al-Co bulk metallic glasses (BMGs) have been prepared by the copper mold casting method. The glass forming ability and magnetocaloric effect (MCE) for these alloys have been investigated. The second-order magnetic transition from para-magnetic to ferromagnetic states takes place at about 9 K. These BMGs exhibit excellent MCE because of their large effective magneton number; Er56Al24Co20 BMG has a maximum entropy change and refrigeration capacity of 16.06 J kg-1 K-1 and 546 J kg-1,respectively...     

FTIR/ATR光谱快速测定糖厂废水COD

利用FTIR/ATR光谱技术建立糖厂废水化学需氧量(COD)的快速测量方法.基于光谱Savitzky-Golay(SG)平滑和偏最小二乘法(PLS)建立光谱优化模型.建立计算机算法平台,把540种平滑模式和1-40的PLS因子数任意组合分别建立SG-PLS模型,预测效果最优的模型平滑模式为2阶导数平滑,6次多项式,51...     

污水化学需氧量近红外光谱分析的波段选择

采用近红外透射光谱和移动窗口偏最小二乘(MWPLS)方法,建立污水化学需氧量(COD)近红外光谱分析的优化模型最优模型的对应波段为820-850nm,采用波长点个数为16,PLS因子数、RMSEP、Rp分别为13,25.5mg/L,0.968,预测相关很高,其预测效果明显优于全谱模型,并且采用的波长点个数远远优于全谱波...     

影响高校高水平运动员学习效果的因子分析

高校招收高水平运动员是我国竞技体育改革的[scy2]必然趋势,通过对运动员进行问卷调查,了解高水平运动员学习状况,运用因子分析的方法找出影响学习效果的主要因子,以期为高校高水平运动队的管理提供一定的帮助,并且为我国进一步的体育改革提供一定的理论支持。     

对无锡市高校体育教育信息化建设的思考

运用文献资料、问卷调查、访问调查、数理统计等研究方法,对无锡市高校体育教育信息化建设和体育部门主页的调查,结果显示:目前无锡市高校在体育教育信息化建设方面严重滞后;体育教学信息化资源开发不足;区域内各学校缺乏有效地的沟通与合作,造成资源无法实现共享;体育教师的信息素质和能力有待提高等。各高校要努力改进现状,大力加快体育教育信息化建设,实现无锡市高校的远程教育和校际间的体育信息化教育资源的共享,促进高校体育教育的发展。     

离子液体中介孔、超大微孔氧化硅整体材料的合成

采用纳米铸造方案,在盐酸介质中,以咪唑盐类离子液体为模板剂,正硅酸乙酯为前驱体,合成了一系列介孔或超大微孔氧化硅整体材料,详细考察了盐酸浓度、盐酸用量和前驱体用量对材料结构参数的影响.结果表明,随盐酸浓度的升高,材料孔体积和孔径呈大致减小的趋势;随TEOS用量的增加,材料孔体积和孔径依次减小.材料大都具有高的比表面积和均一的孔径.