关于环状内酰胺羰基烷基化的反应综述

综述了环状内酰胺羰基烷基化的各种反应,探讨了各种方法的机理,以及各种方法的优劣.     

Lateral Inhomogeneity in the Electronic Structure of a Conjugated Poly(3‐hexylthiophene) Thin Film

How annealing influences the morphology of a highly regioregular poly(3‐hexylthiophene) (RR‐P3HT) film at the substrate interface as well as the lateral inhomogeneity in the electronic structure of the film are elucidated. Whereas previous studies have reported that high‐molecular‐weight (MW) RR‐P3HT films tend to show low crystallinity even after annealing, it is found that high‐MW RR‐P3HT does show high crystallinity after annealing at high temperature for a long time. Photoemission electron microscopy (PEEM), X‐ray photoemission spectroscopy, and ultraviolet photoemission spectroscopy results clearly resolve a considerable lateral inhomogeneity in the morphology of RR‐P3HT film, which results in a variation of the electronic structure depending on the local crystallinity. The PEEM results show how annealing facilitates crystal growth in a high‐MW RR‐P3HT film.     

江垭枢纽引水发电系统综述

江垭枢纽的引水工程由进水塔和引水隧洞组成，布置在河床右岩。进水塔为岸塔式结构，净高７８ｍ；引水隧洞共３条，中心间距１８ｍ，每条洞全长１５８．０４ｍ。地下厂房洞室群位于大坝下游６号冲沟的下部山体内，上覆岩层厚８０～１４０ｍ。升变电工程包括有主变洞、风机油罐室、高压电缆洞、高压电缆竖井和地面开关站、副厂房。对江垭水利枢纽引发水电系统的厂区和建筑物的布置、结构、地下洞室群的开挖支护、混凝土分类、防渗排水     

Using two ray multipath model for microwave link budget analysis

A two-ray ground multipath deterministic model for worst-case fading-depth prediction in microwave link budget analysis is presented. Simple formulas, providing insight into fading depth as a function of geometrical and electrical parameters, are derived. A detailed analysis shows that, in many cases, the fading depth depends mainly on the path-clearance angle. Comparison with the Olsen-Segal model shows that both models have roughly the same path-clearance-angle factor. To the best of the authors' knowledge, this can be considered the first theoretical justification of the path elevation factor in the Olsen-Segal model     

双螺杆挤压机操作参数对早餐谷物产品特性影响的研究

以营养早餐谷物食品配方研究中所确定的最佳配方为基础，应用响应面分析法，首先对螺杆转速、进料速率、加水量等双螺杆挤压机的主要操作参数与早餐谷物产品容重之间的关系进行了研究，然后以容重作为挤压早餐谷物的核心品质指标，确定早餐谷物食品容重、吸水指数与水溶指数等产品品质指标之间的相互联系；建立了相应的数学模型并得出了三种操作参数的最佳取值范围。本试验研究对于开发挤压早餐谷物食品，探索双螺杆挤压机加工谷物原料机理具有现实意义，同时也为挤压早餐谷物食品品质的快速评定提供了依据。     

制造企业要以科技创新产品满足DSM需求

DSM is a movement integrated with and accomplished by government, utilities, manufacturers and customers.As the main body, the nanufacture will function to take all responsibilities of providing timely, reliable and feasible technicalsupporting for the movement. A new product based on high technology is of a great significance in generalizing DSM. Oneimportant and effective measure to implement DSM is the flexible and practicable electrovalence policy, which heavily relieson advanced technology for its execution.     

On the linearity and efficiency of outphasing microwave amplifiers

A new approach for the analysis of the efficiency and linearity of Chireix-outphasing combiners is presented. The approach takes into account, in an explicit manner, the effect of impedance mismatch between the amplifiers and the lossless combining structure. It is shown that the impedance mismatch leads to new expressions for the output voltages from both branches of the amplifier. These expressions explain the origin of the lack of linearity reported in the literature for the Chireix architecture and lead to a new expression for the instantaneous efficiency of a Chireix combiner. Various simulations using a commercial simulator are performed and their results are compared to those predicted by the derived equations. A quasi-exact agreement between the simulator and derived equations is found for all simulations conducted, including voltage expressions, linearity analysis, and instantaneous and average efficiency calculations for a code-division multiple-access signal. The impact of combiner parameters on its linearity and efficiency is also studied.     

成都地区膨胀土地基承载力浅析

膨胀土地基承载力的影响因素较多，尤其是含水率的影响较大。对成都地区一些原位测试数据进行了回归分析后，提出了成都地区膨胀地基承载力与静力触探、标准贯入和含水率的一些关系式。具有一定意义上的客观性。     

节能减排的环保型新工艺—化学镀镍-磷合金

本文介绍了化学镀镍技术的特点、分类、原理和镀液,也论述了发展前景.     

一种新型VHF/UHF双频宽带车载全向天线

提出了一种工作在VHF/UHF频段的双频段宽带垂直极化车载鞭状天线。天线在VHF中馈车载鞭状天线的下辐射体顶端加一个UHF频段8λ40 MHz/4同轴扼流套,将上辐射体分为三段并在段间串接两个λ840 MHz/2倒相线圈,在天线底部加同轴扼流圈,完成了一种VHF中馈鞭状天线与一副UHF三元串联馈电直线阵天线复合的新型VHF/UHF双频段超宽频带垂直极化车载全向天线。该天线在VHF频段(30 MHz~225 MHz),UHF频段(800 MHz~880 MHz)内均具有良好的辐射特性。增益在VHF频段为1.5~4.5 dB i,在UHF频段大于6 dB i。