酒店英文简介中语气与人称的人际功能

在韩礼德的人际意义模式下,研究以30篇酒店英文简介作为分析语料,运用统计和实证的方法,探讨了简介中语气和人称的人际功能。分析表明,提供酒店基本信息的言语功能主要通过陈述句和少量祈使句来实现;而敦促读者采取行动则是通过祈使句及隐喻性陈述句来表达。排他性第一人称代词复数体现说话者的权势和酒店信息的权威性;包容性第一人称代词复数有利于拉近酒店与潜在客人间的心理距离;第二人称代词则创设出读者与酒店进行面对面交流的对话场景。

Wider frequency domain for negative refraction index in a quantized composite right–left handed transmission line

The refraction index of the quantized lossy composite right-left handed transmission line（CRLH-TL） is deduced in the thermal coherence state. The results show that the negative refraction index（herein the left-handedness） can be implemented by the electric circuit dissipative factors（i.e., the resistances R and conductances G） in a higher frequency band（1.446 GHz≤ ω ≤ 15 GHz）, and flexibly adjusted by the left-handed circuit components（Cl, Ll） and the right-handed circuit components（Cr, Lr） at a lower frequency（ω = 0.995 GHz）. The flexible adjustment for left-handedness in a wider bandwidth will be significant for the microscale circuit design of the CRLH-TL and may make the theoretical preparation for its compact applications.

Left-handedness without absorption in the four-level Y-type atomic medium

In this paper we have investigated three external fields interacting with the four-level Y-type atomic system described by the density-matrix approach. The results show that left-handedness with zero absorption is achieved. The zero absorption property displays the possibility of manipulation by varying the phase and the intensity of the coupling field. Also, the zero absorption property may be used to amplify the evanescent waves that have been lost in imaging by traditional lenses. We propose an approach to obtain a negative refractive medium with zero absorption and the possibility of enhaneeingthe imaging resolution in realizing ＇superlenses＇.

Left-Handedness with Three Zero-Absorption Windows Tuned by the Incoherent Pumping Field and Inter-Dot Tunnelings in a GaAs/AlGaAs Triple Quantum Dots System

Left-handedness with three zero-absorption windows is achieved in a triple-quantum-dot system. With the typ- ical parameters of a GaAs/AlGaAs heterostructure, the simultaneous negative relative electric permittivity and magnetic permeability are obtained by the adjustable incoherent pumping field and two inter-dot tunnelings. Furthermore, three zero-absorption windows in the left-handedness frequency bands are observed. The left- handedness with zero-absorption in the solid state heterostrueture may solve the challenges not only in the left-handed materials achieved by the photonic resonant scheme but also in the application of negative refractive materials with a large amount of absorption.

基于手机腾讯QQ的移动教学模式研究

分析了大学生手机使用行为特点和基于手机腾讯QQ移动教学模式并用该模式开展教学,采用测评统计数据、问卷调查手段探讨了该教学新模式在高等教育中的效果与作用。结果表明:基于手机腾讯QQ的移动教学模式操作简单易行,学生有很强的移动学习主动性并对该教学模式非常认可,较大程度提高了教学质量和缓解了我国当下高校教师的教学和科研时间精力有限的现状;积极引导该模式中学习者提高学习质量是一个需要继续深入研究的问题。