双模腔中利用循环跃迁的人工原子实现频率转换

在双模腔中,利用循环布局跃迁的人工原子,给出了实现腔模场频率上转换和下转换的方案.其中,腔模和经典场与三能级人工原子的相互作用都是共振耦合.因此,系统的量子动力学操作处于较高的速度进行.从抑制退相干的角度看,这是非常有意义的.结果表明,制备人工原子在某个初态,可以实现腔模频率上转换和下转换操作.最后,简单说明了从腔模场的任意初态可产生双模压缩态.     

一种光纤CDMA系统的双极码编解码方案

提出一种光纤ＣＤＭＡ系统的双极码编解码方案．该方案综合利用光波分复用ＷＤＭ与现有的光纤ＣＤＭＡ技术,把已经较为成熟的射频ＣＤＭＡ的双极码编码技术移植到光纤ＣＤＭＡ系统中,以达到改善光纤ＣＤＭＡ地址码相关性能的目的     

(1+λu)-Constacyclic codes over Fp[u]/〈u〉

Motivated by the work in [1] of Abualrub and Siap (2009), we investigate (1+λu)-constacyclic codes over F_p[u]/〈u^m〉 of an arbitrary length, where λ is a nonzero element of F_p. We find the generator polynomials of (1+λu)-constacyclic codes over F_p[u]/〈u^m〉, and determine the number of (1+λu)-constacyclic codes over F_p[u]/〈u^m〉 for a given length, as well as the number of codewords in each such code. Some optimal linear codes over F₃ and F₅ are constructed from (1+λu)-constacyclic codes over F_p+uF_p under a Gray map.     

Two Codes for Remedying Problematic Situations: Japanese and English Speakers’ Views of Explanations and Apologies in the United States

This study describes speech codes used by Japanese and English speakers in remedying problematic situations. By analyzing in-depth interviews, the study reveals the Japanese-speaking participants’ use of a code in which offering detailed explanations can be a way to deny having caused another person discomfort, thus being incompatible with their meaning of “apology.” The English-speaking participants used a code in which offering and listening to explanations is a way to show that they care about the relationship and to seek forgiveness. The analysis illustrates how the participants used these codes as a resource to draw a boundary between two speech communities.     

Honor Codes and Other Contextual Influences on Academic Integrity: A Replication and Extension to Modified Honor Code Settings

Research has shown that traditional academic honor codes are generally associated with lower levels of student academic dishonesty. Utilizing data obtained from students at 21 colleges and universities, this study investigated the influence of modified honor codes, an alternative to traditional honor codes, that is gaining popularity on larger campuses. It also tested the model of student academic dishonesty previously suggested by McCabe and Treviño in a more diverse sample of campuses. Results suggest that modified honor codes are associated with lower levels of student dishonesty and that the McCabe and Treviño model appears to be reasonably robust.     

新一代的纠错码--Turbo码

综述了香农编码定理指导下信道编、译码的发展概况,系统地分析了最近引起普通强烈关注的Turbo码的基本构造原理,指出目前该领域的研究方向。     

板料成形模拟及其在汽车覆盖件冲压过程中的应用

基于板料成形模拟的必要性和汽车覆盖件成形的复杂性 ,提出有限元分析是模拟复杂三维板料成形问题的有力工具 .介绍了动态显式有限元法的原理和特点 ,讨论了国际现有的各种商用软件 ,论述了汽车覆盖件模拟的国内外应用现状 .以某新型汽车前门外板为例 ,运用显示有限元分析软件Dynaform对前门外板冲压过程进行了计算机模拟分析 ,预测冲压过程中可能出现的各种工艺缺陷 ,例如坯料的破裂 ,并以模拟结果为依据提出改进方法 .     

Undergraduate engineering students’ attitudes and perceptions towards ‘professional ethics’ course: a case study of India

‘Professional Ethics’ has been offered as a compulsory course to undergraduate engineering students in a premier engineering institution of India. It was noticed that students’ perceptions and attitudes were frivolous and ornamental towards this course. Course instructors and institution authorities were motivated to find out the factors contributing to this awkwardness. For this purpose, a questionnaire was prepared and administrated to 336 students registered for the July–November 2014 semester. The study found two factors contributing to students’ indifference towards the Professional Ethics course. First, most of the students did not have self-interest to join the engineering programme, and while pursuing their study, they decided to switch to a different field upon completion of their engineering study. Second, students who desired to be engineers in their future believed that engineering code of ethics is not really referred to in most of the engineering jobs, and therefore Professional Ethics course is only meant for classroom discussions.     

基于迹准则的超正交空时格码的设计

为了改进超正交空时格码的设计,提出了基于迹准则的设计方法.分析了传统基于秩行列式准则设计方法的缺点,以及基于迹准则设计的优点.研究了基于迹准则的设计方法中STBC方案、集分割、网格结构、信号子集与STBC方案在网格中的分配这四大要素的优化原则,并依据这一原则给出了码的系统化手工设计的具体步骤.再通过星座扩展的方法,可以使设计出的码性能进一步提高.文中给出了码的设计结果,仿真表明得到的新码具有更好的性能.     

文化符号编织的网络--对《木箱深处的紫绸花服》的符号学解读

本文运用符号学方法对王蒙的短篇小说进行了细致的解码阅读，得出如下结论：表面看似一篇描写“紫绸花服”兴衰际遇的私情小说，实际上以普通意象为材料，编织出色彩斑斓的审美含蓄意指；在明白晓畅的文本表层话语背后，蕴涵着深层的文化建构意义。