Voltammetric study of fullerene C60 and fullerene C60 nanotubes with sandwich method

Two sandwich-type electrodes (RTIL/C₆₀/SWNT/GCE and RTIL/C₆₀ nanotube/SWNT/GCE) with fullerene C₆₀ or fullerene C₆₀ nanotubes interlayer covered by room temperature ionic liquid (RTIL) membrane on single-walled carbon nanotubes (SWNTs) modified glassy carbon electrode (GCE) surface were fabricated. Cyclic voltammetry and differential pulse voltammetry were used to characterize their electrochemical behaviors and the difference between fullerene C₆₀ and fullerene C₆₀ nanotubes was investigated and the reason was presumed for the first time. It has been observed that 4 pairs of quasi-reversible redox peaks occurred at the RTIL/C₆₀/SWNT/GCE, while only two peaks at the RTIL/C₆₀ nanotube/SWNT/GCE. The cathodic and anodic peak potentials did not shift with the change of pH, indicating that no protons were involved in the electrode reaction processes. So the redox reaction of the fullerene C₆₀ or fullerene C₆₀ nanotubes could be considered as a multi-step one-electron transfer process and fullerene C₆₀ behaved like an electron accumulator to accept and release electrons. While, the reductive products of fullerene C₆₀ nanotubes could not be oxidized again in the reverse scan and the electrode process was irreversible. The fullerene C₆₀ monomer released the accumulated electrons more easily than the fullerene C₆₀ nanotubes. The electrochemical behaviors showed that the electrochemical processes at both electrodes were adsorption-controlled processes.     

电捕焦油器中焦油雾滴预团聚过程的研究

为了提高电捕焦油器对超细焦油雾滴的捕集效率,提出声波法和荷电法两种焦油雾滴的预团聚方法,并对采用这两种方法的雾滴预团聚过程进行了数值模拟,研究了声波频率和电场强度对雾滴预团聚效率的影响.     

Two-step synthesis of witherite and tuning of morphology

Compared to conventional methods, a simple route is offered for synthesis of BaCO₃ with CO₂ and least energy consumption. And the morphology of BaCO₃ was tuned by controlling reaction conditions. The X-ray diffraction (XRD), Fourier transform infrared (FTIR), scanning electron microscopy (SEM), transmission electron microscopy (TEM) and selected area electron diffraction (SAED) were employed to characterize the products, the results showed that the products with various morphologies had the same crystal phase and growth direction. However, the distinct difference of the prepared products were determined by Raman and UV-vis spectra, showing shape-dependent optical properties. The results provide a useful model system for investigating the shape-dependent optical properties of carbonate nanocrystals.     

LF/VD精炼炉中Ba合金对洁净度的影响

在LV／VD精炼炉中对Ba合金使中的相关问题进行了试验研究，对Si-Ba-Al和Si-Ca-Ba合金在脱氧、脱硫、去夹杂和对夹杂变性方面的效果进行比较，试验结果表明利用Ba合金冶炼洁净钢有着重要的价值。     

Experimental validation of crosstalk simulations for on-chip interconnects using S-parameters

Since the design of advanced microprocessors is based on simulation tools, accurate assessments of the amount of crosstalk noise are of paramount importance to avoid logic failures and less-than-optimal designs. With increasing clock frequencies, inductive effects become more important, and the validity of assumptions commonly used in simulation tools and approaches is unclear. We compared accurate experimental S-parameters with results derived from both magneto-quasi-static and full-wave simulation tools for simple crosstalk structures with various capacitive and inductive couplings, in the presence of parallel and orthogonal conductors. Our validation approach made possible the identification of the strengths and weaknesses of both tools as a function of frequency, which provides useful guidance to designers who have to balance the tradeoffs between accuracy and computation expenses for a large variety of cases     

XW型旋风除尘器的实验研究

一般旋风除尘器由于存在着内涡旋,消耗性能量损失较大。新近研制的XW型旋风除尘器通过设置开孔的内筒来消除内涡旋,可使除尘器在保证除尘效率不降低的情况下,压力损失减小40%。     

BaCa复合脱氧剂精炼对60钢机械性能的影响

在95t氧气顶吹转炉－LF（VD）法生产60钢时，于钢包真空脱气后加入BaCa复合脱氧剂精炼，结果得出，使用BaCa复合剂脱氧后，60钢在－40℃冲击功由Al脱氧的9．7J提高到21．5J。     

管线钢性能的发展

综合阐述了管线钢的强度，韧性，应力腐蚀开裂，氢致裂纹，焊接性能的发展提高过程。指出合金成份设计，冶金技术和控扎控冷工艺三者之间的最佳结合是决定管线钢综合性能的根本，同时提出了我国管线钢发展的应该努力的方向。