RA码编译码算法

本文介绍了重复累积码 -RA码 ,该码分为规则RA码和不规则RA码 .RA码具有线性时间编码算法 .使用积和译码算法 ,可以实现线性时间译码 .本文对RA码的编译码算法进行了分析 ,并进行了系统仿真 .仿真结果表明 ,随着信息长度的增加 ,系统的误码率降低 ,性能接近信道容量 .     

一种数字签名,加密和纠错公钥体制

根据文献１中提出的ＭｃＥｌｉｅｃｅ公钥体制和文献２中提出的二次布尔公钥体制的思想，设计了一种能实现数字签名、加密和纠错的公钥密码体制。     

芡实中的三个环二肽

研究了睡莲科芡属植物芡（Euryale Ferox Salisb．）的成熟种仁芡实的环肽成分．芡实药材经95％甲醇回流提取后,通过硅胶,Pharmadex LH-20凝胶,RP-18反相柱层析进行分离,从中分离鉴定了3个环二肽．其结构经化合物的理化性质测定和光谱数据分析分别鉴定为：环（苯丙-丝）（1）,环（丙-脯）（2）,环（苯丙-丙）（3）,其中化合物1为新的天然产物,化合物2和3为首次从该植物中分离得到．     

期刊条码使用时存在的问题及对策探析

期刊条码作为期刊的"身份证",是适应信息化管理需求而产生的自动识别技术,可以对期刊的零售、分检、计数、借阅等诸环节实行自动化管理,加快工作流程,解放劳动力.据笔者调查,学术类期刊条码使用不规范的占到九成以上,笔者列举了条码使用不规范的现状,并提出了一些对策供同行参考.     

对西方马克思主义技术批判理论的反思

卢卡奇以物化开始了对西方病态社会的技术批判。把现代生产揭示为抽象化、形式化和合理化。海德格尔的“座架”、马尔库塞的技术统治论、哈贝马斯的科学技术作为意识形态、芬伯格的“技术代码”等都坚持了技术设计的人类学因素,即技术不是中性的。他们的技术批判理论体现着西方的人文主义传统,即技术的设计是一种历史的和社会的设计。在技术的设计中应该坚持在感性交往基础上的释义学方向,允许有多种可能技术的共同存在,从而显现出人类生活的多样性和丰富性。     

基于矩阵扩展方法的多速率线性离散码设计

在采用空时码的无线通信系统中,收发2端较差的路径会降低系统的性能.提出了多速率线性离散码(LDC),并对其进行了分析,给出了一种基于矩阵扩展方法的设计算法.多速率LDC是传统LDC和LDC-TAS的BER性能的折中.进而提出了一种性能优于传统LDC-A-TAS算法的多速率LDC自适应发送天线选择(A-TAS)算法.     

Technology adoption,consumer inattention and heuristic decision-making: Evidence from a UK district heating scheme

This paper contributes to the debate on the energy efficiency paradox according to which consumers fail to adopt cost-effective, energy efficient technologies over less efficient technologies and therefore fail to reduce energy consumption. Both traditional and behavioural theories are used to investigate the decision-making process of residential consumers with empirical evidence based upon a specially designed quasi-experimental survey of 784 households on the decision to connect to a district-heating system, a more energy efficient alternative to individual heating systems. The results suggest an internal discount rate of around 36 per cent for homeowners, a signal that consumers undervalue future energy costs. We also find the household’s decision to be negatively affected by years of payback up to around 7–8 years. Our findings suggest that neglecting consumer inattention and heuristics can lead to biases which cast doubt on the existence of the energy efficiency paradox. We believe that these results help to explain why some consumers are unlikely to invest in energy efficient technology, particularly those on low incomes.     

Cyclic electron flow around photosystem I is required for adaptation to high temperature in a subtropical forest tree, Ficus concinna

Dissipation mechanisms of excess photon energy under high-temperature stress were studied in a subtropical forest tree seedling, Ficus concinna. Net CO2 assimilation rate decreased to 16% of the control after 20 of high-temperature stress, and thus the absorption of photon energy exceeded the energy required for CO2 assimilation. The efficiency of excitation energy capture by open photosystem Ⅱ (PSII) reaction centres (Fv'/Fm') at moderate irradiauce, photochemical quenching (qp), and the quantum yield of PSII electron transport (φPSII) were significantly lower after high-temperature stress. Nevertheless, non-photochemical quenching (qHP) and energy-dependent quenching (qE) were significantly higher under such conditions. The post-irradiation transient of chlorophyll (Chl) fluorescence significantly increased after the turnoff of the actinic light (AL), and this increase was considerably higher in the 39 ℃-grown seedlings than in the 30 ℃-grown ones. The increased post-irradiation fluorescence points to enhanced cyclic electron transport around PSI under high growth temperature conditions, thus helping to dissipate excess photon energy non-radiatively.     

蛋白质loop区域闭合数值方法分析与比较

针对蛋白质loop区域的闭合问题,比较分析了两种来源于机器人学的数值方法——循环坐标下降法（CCD）和雅可比矩阵方法,进行了实现并设计实验。在计算时间和闭合效率方面循环坐标下降法要明显优于雅可比矩阵方法,而雅可比矩阵方法则可以较平均地改变每一个二面角值。     

Socialisation and citizenship preparation in vocational education: Pedagogic codes and democratic rights in VET-subjects

ABSTRACT

Previous studies of citizenship preparation in upper secondary school, including studies on vocational programmes, have primarily focused on general subjects. Potential and actual roles of vocational subjects in this context have received little attention, so we have little knowledge of what is likely a significant part of the citizenship preparation that occurs in vocational programmes. Drawing on the work of Basil Bernstein and ethnographic data, this study presents an analysis of socialisation processes in vocational elements of three vocational programmes in Swedish upper secondary school. The analysis addresses the formation of pedagogic codes in various vocational programmes and subjects, and how these codes condition students’ practice of citizenship at individual, social and political levels. The results show how different pedagogic codes have different implications for the students’ practice of citizenship, and thus raise questions about factors and processes that may either constrain or strengthen, this aspect in vocational subject classes.