早期中国宇宙观特征

早期中国宇宙观有三个特征一是时空的“循环变易观”,后来儒道分别在此基础上发展出“中庸”和“反者道之动”的特色思维;二是天人相通的政治—宗教色彩,使得非宗教的儒学担当起中国人精神家园的实际功用,知识分子也以积极入仕为己任;三是“天事必象”的特征,奠定了中国古代非形而上学的文化偏好。我们欲寻中国文化之源,应给予夏商周三代以足够的重视。     

Dynamic Nature of Boundaries of Speech Communities: Learning and Negotiating Codes in Intercultural Communication

Using the ethnography of communication and speech codes theory, this study aims to capture instances in which individuals’ views of appropriate conduct and cultural boundaries are undergoing change in intercultural interactions. The paper proposes a way of describing such instances by illustrating Japanese speakers’ experiences of encountering unfamiliar codes in problematic situations with English speakers in the United States, recognizing boundaries, negotiating contrasting codes, and revising their perceptions of codes and boundaries as a result of engaging in remedial episodes. The study illuminates the dynamic nature of the boundaries of speech communities and adds an ethnographic exploration of intercultural communication.     

Decoding technique of concatenated hadamard codes and its performance

１　Ｉｎｔｒｏｄｕｃｔｉｏｎ　ＩｎｔｈｉｓｐａｐｅｒｓｏｆｔｉｎｓｏｆｔｏｕｔＭＡＰｄｅｃｏｄｉｎｇａｌｇｏｒｉｔｈｍｓｂａｓｅｄｏｎｔｈｅｆａｓｔＨａｄａｍａｒｄｔｒａｎｓｆｏｒｍ（ＦＨＴ）ａｒｅｄｅｖｅｌｏｐｅｄ,ａｎｄｔｈｅｉｒａｐｐｌｉｃａｔｉｏｎｓｉｎｄｅｃｏｄｉｎｇｌｏｗｒａｔｅｍｕｌｔｉｄｉｍｅｎｓｉｏｎａｌｃｏｎｃａｔｅｎａｔｅｄＨａｄａｍａｒｄｃｏｄｅｓａｒｅｅｘａｍｉｎｅｄ．Ｔｈｅｐｒｏｐｏｓｅｄｍｅｔｈｏｄｈａｓａｎｏｔａｂｌｅａｄｖａｎｔａｇｅｏｆａｃｈｉｅｖ…     

Experimental study on uniaxial time-dependent ratcheting of a polyetherimide polymer

The uniaxial ratcheting behavior of a polyetherimide （PEI） polymer ＇TECAPEI＇ was studied using stress-controlled cyclic loading at room temperature, including both cyclic tension-compression with non-zero tensile mean stress and tension- unloading tests. The experimental observations were focused on the time-dependent ratcheting of the PEI polymer revealed in cyclic tests at diverse stress rates and with different peak stress holding times. The results showed that the PEI polymer shows obvious ratcheting deformation; i.e., the ratcheting strain accumulates progressively in the tensile direction during stress- controlled cyclic tests with non-zero mean stress. The ratcheting is highly dependent on the applied mean stress and stress am-plitude, and is also characterized by a strong time-dependency during the cyclic stressing at diverse stress rates and with different peak stress holding times. The time-dependent ratcheting of the PEI polymer is caused mainly by its remarkable viscosity. A comparison of the ratcheting occurring before and beyond the ultimate stress point of the PEI polymer showed that the ratcheting beyond the ultimate stress point is more significant than that occurring before that point.     

二元BCH(15,5,7)捕错译码器的译码算法与设计

二元BCH码是一种纠错能力极强的好码,具有良好的代数结构和纠错能力,可以用循环移位寄存器来设计其编码器和译码器.对于BCH（15,5,7）的突发错误,本文采用捕错译码算法,设计了BCH（15,5,7）码的一种高效可行的译码器,其电路设计行之有效,纠错能力强,在通信系统中可以提高通讯数据传输的准确性,具有一定的现实意义和应用前景.     

基于内容分析法的网上考试系统源码研究

本研究采用内容分析法,按源代码从开发语言、数据库、代码量级、系统架构类型等角度对网上考试系统进行统计分析。文章认为,当前国内网上考试系统存在资源重复和介绍信息不规范两个问题,并指出建立整合性的学习管理平台,利用先进的互动性学习平台来改善学生的学习体验,是网上考试系统必然的发展方向。这有利于从根本上根除学生为考试而学习的错误动机,让教育朝着健康和正确的方向发展。     

M68HC08单片机与PC机串行通信的实现

介绍了M68HC08系列单片机与PC机串行通信的实现方法,给出了硬件设计及通用程序实例, 该实例稍加修改即可用于Motorala其它型号的单片机,具有实际参考价值。     

基于802.16e的同步技术研究

在802.16e系统中,接收端对同步精度有很高的要求,同步误差会导致系统性能的急剧下降。文章介绍了OFDMA的基本概念和体系结构,分析了同步误差对系统性能的影响,并对系统的同步估计算法进行了分析与研究。     

一种降低OFDM信号PAPR的编码技术

介绍OFDM（orthogonalfrequencydivisionmultiplexing）系统的信号传输过程,分析OFDM信号高峰值平均功率比对系统性能的影响,针对降低峰值平均功率比的编码方法,运用Matlab进行了格雷码方法仿真验证,证明该编码方法可以有效解决OFDM信号的高峰值平均功率比问题,可以将信号的峰值平均功率比值控制在3dB内,与输入的数据和子载波数目无关．     

Amplification of urea detection based on pH-sensitive liposomes

BackgroundThis study aimed to develop an amplification method of urea detection based on pH-sensitive liposomes.ResultsThe urease covalently immobilized on the magnetic particles and the pH-sensitive liposomes encapsulating ferricyanide were added to the cyclic-voltammeter cell solution where urea was distributed. The conversion of urea into carbonic acid seemed to induce a pH decrease that caused a reduction in the electrostatic repulsion between the headgroups of weakly acidic 1,2-dipalmitoyl-sn-glycero-3-succinate. The reduction induced the liposomes to release potassium ferricyanide that was encapsulated inside. The effects of urea concentration and pH value were investigated. A specific concentration (0.5 mg/mL) of the urea solution was set to observe the response. The activity of urease was reversible with respect to the pH change between 7 and 5. The sensitivity of this detection was almost identical to the comparable techniques such as an enzyme-linked immunosorbent assay and a field-effect transistor.ConclusionsIn summary, the methodology developed in this study was feasible as a portable, rapid, and sensitive method.How to cite: Kang MK, Park J-W. Amplification of urea detection based on pH-sensitive liposomes. Electron J Biotechnol 2021;51. https://doi.org/10.1016/j.ejbt.2021.04.005