ELECTROCHEMICAL IBTERACTIOS OF BEYPAZARI LIGNITE IS STROHG ACIDIC MED1A

Beypazari lignite was extracted with acetonltrile and acetonitrile/HClO₄ and electrochemical hydrogenation of the lignite in acetonltrile/LlC10₄ in the presence of HClO₄. was investigated. Controlled potential electrolysis experiments were carried out at -0.5 V vs a Ag/AgCl electrode. Infrared spectra of the products were measured and yields of extraction were determined. Extraction yields In acetonitrile and acetonitrile/HCIO₄ were 9 and 17.3 %, respectively. The yield of extractable material did not increased in the electrochemical environment. Acetonltrile extraction produced residual matter with less hydroxyl groups. Stirring the lignite in acetonitrile(HClO₄ for 7 hours oxidized both the extract and the residue. The residue seemed to contain less hydroxyl groups than that of the acetonltrile extraction residue and It has new carbonyl and etheric groups that were absent in the original lignite. It was found that the material extracted during electrochemical treatment by acetonitrile/HClO₄ was hydrogenated and the coal matrix remained intact. As the quantity of HClO₄ consumed in electrolysis was increased the amount of methyl groups in the extract also increased. Higher potentials are probably neccessary to hydrogenate the coal matrix by the electrochemlcally produced hydrogen atoms.     

一种基于改进频繁树模型的智能交通信息关联挖掘方案

针对传统交通系统在对海量交通信息深层次处理和分析上的不足,文章提出了一种新的智能交通系统体系结构以及一种基于该结构和数据挖掘技术的改进频繁树模型的关联挖掘分析方案。该方案运用系统工程的思想,对改进算法的步骤及其关键技术的实现做了详细阐述,最后通过实验对比验证了该方案的可行性及有效性。实验结果表明:该方案不仅能够实现对智能交通信息快速而有效的挖掘,而且还能根据需求得到精确、简练的有用信息,为评估和决策提供准确依据。     

基于UVM的可重用SoC功能验证环境

现在系统级芯片(SoC)系统集成度和复杂度不断提高,验证环节消耗时间占用了芯片研发时间的70％,芯片验证已经成为芯片研发中最关键的环节.目前业界验证方法大多有覆盖率低和通用性差等缺点,基于上述原因提出了一种新的验证方法.与传统验证方法和单纯的通用验证方法学(UVM)不同,该方法结合系统级芯片验证和模块级验证的特点,并且融合UVM和知识产权验证核(VIP)模块验证的验证技术,且使用了SoC系统功能仿真模型以提高验证覆盖率和准确性.验证结果表明,同一架构系列SoC芯片可以移植于该验证平台中,并且可大幅缩短平台维护与开发时间,采用该验证方法的代码覆盖率为98.9％,功能覆盖率为100％.     

Hypercrosslinked microporous organic polymer networks derived from silole-containing building blocks

Three silole-containing hypercrosslinked microporous organic polymer networks were designed and synthesized via Friedel–Crafts alkylation promoted by anhydrous FeCl₃. The results demonstrated that the substitution of methyl group connected with silicon atom by benzene has negligible effect on the surface area and gas uptake ability of the polymer networks. The network-1 produced from 1,1-dimethyl-2,3,4,5-tetraphenylsilole shows a surface area up to 1236 m² g⁻¹ with the hydrogen uptake ability of 1.33 wt% (77.3 K/1.13 bar) and a carbon dioxide capture capacity of 2.94 mmol g⁻¹ at 273 K/1.13 bar. The isosteric heats of carbon dioxide sorption for all of the polymer networks exceed 25 kJ/mol at the zero coverage because the introduction of silicon atom into the polymer skeleton enhanced the binding affinity between the adsorbent and CO₂ molecules. In addition, the selectivity of the polymer networks for CO₂/N₂ and CO₂/CH₄ were found to be around 35 and 6 at 273 K, respectively. These results show that these materials are potential candidates for applications in post-combustion CO₂ capture and separation.     

Molecular Approach to Electrochemically Switchable Monolayer MoS2 Transistors

As Moore's law is running to its physical limit, tomorrow's electronic systems can be leveraged to a higher value by integrating “More than Moore” technologies into CMOS digital circuits. The hybrid heterostructure composed of two-dimensional (2D) semiconductors and molecular materials represents a powerful strategy to confer new properties to the former components, realize stimuli-responsive functional devices, and enable diversification in “More than Moore” technologies. Here, an ionic liquid (IL) gated 2D MoS₂ field-effect transistor (FET) with molecular functionalization is fabricated. The suitably designed ferrocene-substituted alkanethiol molecules not only improve the FET performance, but also show reversible electrochemical switching on the surface of MoS₂. Field-effect mobility of monolayer MoS₂ reaches values as high as ≈116 cm² V⁻¹ s⁻¹ with I_on/I_off ratio exceeding 10⁵. Molecules in their neutral or charged state impose distinct doping effect, efficiently tuning the electron density in monolayer MoS₂. It is noteworthy that the joint doping effect from IL and switchable molecules results in the steep subthreshold swing of MoS₂ FET in the backward sweep. These results demonstrate that the device architecture represents an unprecedented and powerful strategy to fabricate switchable 2D FET with a chemically programmed electrochemical signal as a remote control, paving the road toward novel functional devices.     

屏蔽电泵蛇形管氩弧焊工艺分析

对14× 2的 1Cr18Ni9Ti不锈钢管焊接工艺进行了试验分析 ,经试验蛇形管氩弧焊的方法是正确可行的     

轧辊轴承的脂润滑（三）

介绍了轧辊轴承的润滑特点,分析了轴承润滑油膜参数与其寿命间的关系;指出我国轧辊轴承早期损坏严重的主要原因是轴承密封不良导致润滑失效;并对润滑剂的选择、润滑方法提出建议。     

Carbon Nanotube Synthesis via the Catalytic CVD Method: A Review on the Effect of Reaction Parameters

This review covers the results obtained in carbon nanotube synthesis by chemical vapor deposition. Parameters such as catalysts, supports, carbon precursors, reaction time, temperature and gas flow rates that are used in the production of carbon nanotubes are discussed throughout the text. Purification of the synthesized carbon nanotubes and methods utilized for cost reduction were also explored.     

影响增透膜透射光强的因素

本文讨论介质折射率对增透膜透射光强的影响     

单脉冲电流对高速钢裂纹的止裂效果

利用电磁热效应原理,探讨了超强度脉冲电流对高速钢裂纹止裂的可能性,结果表明,利用电磁效应可在裂纹尖端形成焊口,使裂纹尖端的曲率半径增大,抑制了裂纹扩展,同时,对裂纹尖端热影响区的组织进行了分析,讨论了裂地端的组织变化对止裂效果的影响。