Method on PAPR reduction in digital beam-forming

Digital beam-forming technology is one of the key technologies in 5G communication.However,the high peak-to-average power ratio in digital beam-forming would make the power amplifier work in the nonlinear region.Nowadays,the solutions to the high peak-to-average power ratio,such as selected mapping,embedded side information selected mapping have some faults:the complexity is high,and the utilization of the bandwidth is low.A blind selected mapping method to reduce the high peak-to-average power ratio based on MUSIC algorithm was proposed.In this method,the side information was omitted,so the utilization of the bandwidth was improved.Simultaneously,the result of the peak-to-average power ratio reduction and the complexity is much more enhanced.     

Tau—p变换技术及其在煤田地震资料处理中的应用前景

在τ—p变换中,由于连续公式的离散化和空间有限性,使得消除假频和“端点效应”越显其重要性。对消除τ—p变换中产生的假频仍有待进一步改进和发展。本文提出选择性叠加方法,使τ—p变换技术更为有效。     

Sex pheromone components isolated from china corn borer,Ostrinia furnacalis guenée (lepidoptera: Pyralidae), (E)- and (Z)-12-tetradecenyl acetates

The sex pheromone components from the corn borer spreading widely in China,Ostrinia furnacalis Guenée, have been identified as (E)-and (Z)-12-tetradecenyl acetates (E andZ12–14 Ac). The ratio ofE isomer toZ isomer was 53 47. Traps containing 1 × 10^–7–1 × 10^–5 g of these compounds captured more males than did live females or their tip extract (3–6 female equivalents). Tetradecyl acetate (14 Ac) was also identified in the tip extract. Its quantity was about 1.8 times the sum of the other two isomers. However, including this compound in its natural ratio in pheromone traps resulted in a decrease in trap catches (P< 0.05).     

40Cr钢液相等离子体电解氮碳共渗层的组织与性能

在NaCl溶液和甲酰胺组成的电解液中,应用液相等离子体电解氮碳共渗技术对调质态40Cr钢进行处理,表面得到氮碳共渗层,研究了其组织与性能。结果表明,经液相等离子体电解氮碳共渗处理后,试样表面为多孔形貌,处理10 min后渗层厚度可达38μm,渗层由两层白亮层和过渡层组成。XRD分析表明外白亮层由ε-Fe2-3N、Fe5C2、Fe3C和α-Fe(N)马氏体组成,SAED分析证明内白亮层为α-Fe(N)马氏体。渗层的显微硬度最高可达650 HV0.05,经氮碳共渗处理后试样的腐蚀速率远小于40Cr钢基体的腐蚀速率。     

The prediction of fatty acid structure from selected ions in electron impact mass spectra of fatty acid methyl esters

The possibility of fatty acid identification from ions in the mass region of 50–110 amu in electron impact mass spectra has been studied by application of various multivariate techniques. The focus has mainly been on the prediction of the number of double bonds in methylene‐interrupted polyunsaturated fatty acids isolated from marine lipids. The number of double bonds in these fatty acids could be predicted with high accuracy, both by partial least squares regression on all ions in this region, and by multiple linear regressions on selected subsets of 5–6 ions. The subsets with optimal predictive power have been found, and the ability to distinguish between methylene interrupted polyunsaturated fatty acids and other fatty acids have also been evaluated.     

基于Sobel垂直算子检测的车牌定位算法

提出一种新的车牌识别的定位算法,对已预处理增强的图像进行Sobel垂直算子检测,用阈值分割出前景,搜索出符合车牌字符特征的候选区域,对候选区域进一步分析定出牌照位置。算法定位速度快,准确率高,对夜间有反光的图片能有效确定牌照的位置。     

Richard M. Shiffrin: Award for Distinguished Scientific Contributions.

Provides the biography of Richard M. Shiffrin and announces that he has received the APA Award for Distinguished Scientific Contributions (2004) for his brilliant development of formal models of memory and forgetting; for his ingenious empirical investigations into the nature of memory and attention; and for his unified accounts of attention and memory search, of recall and recognition, and of the adaptive processes that underlie explicit memory and implicit learning. A selected bibliography is also provided. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Eric Stice: Award for Distinguished Scientific Early Career Contributions to Psychology.

Provides the biography of Eric Stice and announces that he has received the APA Award for Distinguished Scientific Early Career Contributions to Psychology (2004) for his distinguished contributions to the understanding of adolescent psychopathology, including eating disorders, obesity, depression, and substance abuse. A selected bibliography is also provided. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Frequency‐selected microwave heating: Its mathematical physics basis and characteristics

Microwave energy is widely used for heating, however, it usually causes nonuniformity temperatures. In this study, systematical mathematic derivations as well as the theory of electromagnetic wave propagation in a multimode cavity is used to demonstrate the mathematical physics basis of frequency‐selected microwave heating, moreover, the characteristics including the dependence of frequency selecting criteria and the shape of heated samples on heating performance are further analyzed. Finally, numerical computation based on finite element method is used to verify the correctness of the conclusions. This study can help us make better use of microwave energy.     

一种改进的降低MIMO-OFDM系统峰均比的联合算法*

多输入多输出频分复用(MIMO-OFDM)技术是将OFDM与MIMO技术相结合的无线通信系统,它在继承OFDM与MIMO技术诸多优点的同时,具有OFDM系统存在的峰均比(PAPR)较高的问题。选择性映射法(SLM)和预留子载波保留算法(TR)具有很好地抑制PAPR的性能,但是把传统的TR或SLM方法直接运用到MIMO-OFDM系统中却难以达到很好地抑制PAPR效果。为了寻求在MIMO-OFDM系统中改善PAPR性能的同时降低算法实现复杂度,提出一种TR与SLM算法相结合的适合MIMO-OFDM系统的改进算法TR-SLM。通过理论分析与仿真结果表明,TR-SLM级联算法不仅能有效抑制MIMO-OFDM系统的PAPR,同时可减小算法的计算复杂度与系统实现的复杂度。