铁氧体片对称加载矩形波导中的TEM场区

本文证明了铁氧体片对称加载矩形波导中可以存在TEM场区,并且导出了加载铁氧体片厚度、铁氧体特性以及微波频率之问所满足的关系式。     

The precipitation strengthening behavior of Cu-rich phase in Nb contained advanced Fe-Cr-Ni type austenitic heat resistant steel for USC power plant application

Copper has been used as a strengthening element in newly developed Fe-Cr-Ni type austenitic heat resistant steel for inducing Cu-rich phase precipitation to meet high temperature strength requirement f...     

浅议TEM8口译评分标准

TEM8口译评分标准仅包括准确度一个评分项目，评分标准不够全面。在原评分标准的基础上增加“表达”项是十分实际、有效的办法，考生的口译能力会得到更加全面的评估。     

Bias polarity-sensitive electrical failure characteristics of ZnSe nanowire in metal–semiconductor–metal nanostructure

The effect of bias polarity on the electrical breakdown behavior of the single ZnSe nanowire(NW) in the metal–semiconductor–metal(M–S–M)nanostructure under high current density and high bias conditions has been studied in the present paper. The experimental results show that the failure of the ZnSe NW in M–S–M nanostructure was sensitive to bias polarity since the NW commonly collapsed at the negatively biased Au metal electrode due to high Joule heat produced in NW at the reversely biased Schottky barrier. Thus, the electrical breakdown behavior of the ZnSe NW was highly dominated by the cathode-controlled mode due to the high resistance of the depletion region of ZnSe NW at the reversely biased Schottky contact.     

地方高校英语专业学生元认知策略使用调查——以韶关学院为例

对韶关学院133名英语专业本科生元认知策略使用情况的调查结果表明，学生不经常使用元认知策略；建立学习重点、安排和计划学习、评价学习这三类元认知策略都与英语专业四级成绩具有相关性；成绩合格组和不合格组在建立学习重点及安排和计划学习两类策略的使用上存在显著差异。     

用电子显微镜研究花岗石的抛光机理

以扫描电子显微镜和透射电子显微镜为主要测试手段,研究了花岗石石材磨削抛光后其表面的微观结构特点,发现了花岗石抛光层的存在,以及抛光层内矿物为晶质的,进而得知花岗石的抛光机理是以热物理作用为主,微切削作用为辅     

综合物探方法在煤田水害探测中的应用

在特定的自然、地质环境条件下,具有露头的煤层容易自燃形成火烧区,致使下部矿井与上部水利联系密切,增加了矿井生产的安全隐患。赋存在具有特殊结构的煤系地层中的煤层自燃后产生"热剩磁",可通过高精度磁测对火烧区的范围进行圈定,结合瞬变电磁勘探对火烧区的富水性进行评价,以指导矿井安全生产。本文介绍了两种方法的基本原理、数据采集以及资料处理与解释,结合勘探实例,表明高精度磁测和瞬变电磁联合的方法在煤田火烧区有着良好的应用前景。     

Effect of thermal exposure on the stress-rupture life and microstructure of a low Re-containing single crystal alloy

In this paper, the stress-rupture tests of a low Re-containing single crystal alloy IC21 before and after thermal exposure at 1100 ℃for various periods of time were conducted under the test condition of 1100 ℃/137 MPa, and the microstructure of the tested specimens was characterized by SEM and TEM. The experimental results showed that the stress rupture life of this alloy was over 150 h after the standard heat treatment of1320 ℃, 10 h/AC t 870, 32 h/AC, however the stress rupture life decreased with the increase of exposure time due to the microstructure degradation. The TEM analysis revealed that the interface mismatch dislocation networks were well established. It was observed that these mismatch networks could form at 1100 ℃ even after thermal exposure for 1 h without the external stress, which is quite different from that in the traditional single crystal superalloys.     

液体金属脆机理研究

从实验和计算两个角度研究液体金属脆机理,利用第一原理和陈难先三维晶格反演方法获得Ａｌ－Ｇａ和Ｇａ－Ｇａ有效对势。运用分子动力学研究液态金属吸附对位错发射的影响。模拟结果表明,当Ａｌ晶体的纹表面吸附Ｇａ原子之后,裂尖发射位错临界应力强度因子降低。     

Assembly of gold nanoparticles with H10TTPR （3a, 4, 5, 8, 9, 9a, 10, 11-octa-hydro-2H,3H-1,6,7,12-tetrathia-perylene） as the rigid cross-linker

Gold nanoparticles were assembled with the rigid cross-linker, H10TTPR. The assembly process was studied with the UV-vis spectroscopy and TEM. By adjusting the amount of H10TTPR added to the gold nanoparticle solution,the aggregate form of gold nanoparticles could be controlled.