On the current delivery limit of semiconducting carbon nanotubes

The current carrying capacity of single-walled semiconducting carbon nanotubes (CNTs) is studied by self-consistent quantum simulations using the non-equilibrium Green’s function formalism with the self-consistent Born approximation. The simulation shows that the current carrying capacity depends on the bias regime and is drastically different from that of metallic tubes. For long CNTs (with a length much longer than zone boundary and optical phonon scattering mean free path), the current saturates around 20 μA in the forward bias regime with unipolar transport due to phonon scattering. In ambipolar transport regime, the current delivery limit is still about 20 μA due to recombination of electron and hole currents. In contrast, for short semiconducting CNTs, the current delivery capacity can be above 25 μA in the unipolar transport regime and further double in the ambipolar transport regime. In reverse bias regime, the current of a long CNT can exceed 20 μA due to the second subband conduction and increased electron injection from the drain. The simulation provides a coherent explanation to the dependence of current delivery limit on bias regime and channel length, which is consistent with recent experiments.     

叠后地震剖面的线性化波阻抗反演

本文提出了由井旁道出发逐道进行的叠后地震剖面的线性化波阻抗反演方法。每一道反演采用逐次线性化对波阻抗进行修正，反演的纵向分辨率为一个采样时间间隔，并以合成记录道与实际地震道的相似系数作为迭代收敛准则，已处理的地震道波阻抗作为下一道反演初始值。实际资料处理表明，该方法具有较高的分辨率和运算速度快的优点。     

Damage tolerance of glass mat/epoxy laminates hybridized with flexible resin under static and impact loading

This study deals with the impact property and damage tolerance of matrix hybrid composite laminates with different laminate constitution. The matrix hybrid composite laminates consisted of the laminae with a conventional epoxy resin and the laminae with a flexible epoxy resin modified from the conventional resin to avoid the interlaminar delamination. The impact energy absorption ratio greatly depended on the matrix resin placed at the impact face. The energy absorption was almost constant if the conventional resin was placed at the impact surface layer, while it increased exponentially with the increasing fraction of the flexible resin if the flexible resin was placed at the impact face. The impact energy was absorbed by the damage development and propagation in the laminate with conventional resin laminae as the impacted face, while it was absorbed by both the recoverable deformation of the flexible resin and the damage propagation in the laminate with flexible resin laminae as the impacted face.     

济钢中板厂加快技术创新的对策

本文通过对中板厂近年来技术改造后工艺装置和技术水平的分析，并结合中国加入WTO后对中国钢铁企业面临全球化市场竞争严峻性的认识，提出了中板厂在实现高产生产模式后，应加快技术创新的步伐，尽快完成由高产向优质、多品种、低消耗的高效化生产模式转化的主导思想、措施及建议。     

Visual C++与Fortran混合编程及Matcom绘图在空调负荷计算软件中的应用

介绍利用VC与Fortran进行混合编程，将Visual C 程疗从DOS环境下移植到期Windows环境下，并利用Matcom对数据进行可视化的方法。     

前馈和反馈相结合的控制策略在宝钢线材厂控冷轧线上的应用实践

在详细分析料坯在水箱内冷却热过程特点的基础上，提出了前馈和反馈相结合的水流量优化控制策略，并将该策略应用于宝钢线材厂控冷轧线上。实际运行结果表明：该策略能够合理地控制水箱水流量，从而保证了线材水箱出口处的温度满足工艺要求，大大提高了线材成品的质量。所做工作对国内同类企业有重要的意义。     

��������ʵ�ֶ�������ϵ��Դ�����DZ���Ϳ�����

中国重庆川东地区是四川盆地天然气的主要储产地区，对川气东输工程具有举足轻重的影响，但由于勘探难度增大，使储量增长速度明显放慢，储采比快速下降，若元新的发现，将无法保证长期高产稳产。章针对该地区天然气储量资源的结构及现状，分析了二叠系、三叠系动勘探开发的潜力，认为在该区实施二叠系、三叠系滚动勘探开发是一项投资省、见效快的工作，指出重庆气矿近斯的发展方向应针对二叠系、三叠系实施滚动勘探开发。章还提出了相应的技术保障措施和近期工作的初步设想，优选了近期工作目标。     

国产灯用煤油中芳烃的分析

利用ＳＱ－２０６气相色谱议和ＨＰ５８９０Ⅱ／５９７１Ａ色质联用分析仪（ＧＣ／ＭＳ）对国产灯用煤油进行了分析，检测出煤油中的各类芳烃，并用校正归一法求出大庆煤油中烷基苯含量为３．６％，萘的衍生物为４％，总芳烃含量１０．６％，为灯用煤油脱除芳烃制备无芳烃煤油的研究提供了试验依据。     

采取具体措施 发挥教研室的职能作用

本文就如何发挥高校教研室的职能作用记述了本教研室所采取的具体方法和措施。     

Temperature Dependence of Ultra-Low-Frequency Dielectric Relaxation of Barium Titanate Ceramic

Based on a linear voltage ramp method, ultraslow dielectric relaxation of undoped BaTiO₃ ceramic has been carefully measured over the temperature range between − 180° and +120°C. Temperature dependence of the dielectric constant in the frequency range from 10 ⁻⁵ to 10⁻¹ Hz can be obtained using Kramers–Kronig equations. Close to the Curie temperature, the dielectric constant increases so rapidly that the Curie peak is overwhelmed. Two kinds of relaxation processes were observed in this experiment. Ferroelectric domain and mobile charge are proposed to be responsible for the relaxation over the temperature range. With temperature increasing, Maxwell–Wagner relaxation associated with mobile charge gradually dominates. From relaxation time constants at various temperatures, relaxation activation energies about 0.06 and 0.09 eV are identified.