赖氨酸发酵废渣中硫酸铵的去除

采用湿热法处理赖氨酸发酵废渣中的高浓度硫酸铵使之能用于饲料生产.结果表明:在常压100℃蒸气汽提条件下,将水与废渣混合之后再加入硫酸铵去除剂时的处理效果较为理想.此时硫酸铵去除剂的用量为废渣量的17%,硫酸铵去除率达96.04%.粗蛋白质含量为47.66%.     

Poly(ethene-1,1,2,2-tetrathiol): Novel cathode material with high specific capacity for rechargeable lithium batteries

Novel thioether compound poly(ethene-1,1,2,2-tetrathiol) was synthesized, characterized and tested as cathode active material. The polymer was synthesized by facile one-step procedure and its chemical structure was confirmed by FT-IR, FT-Raman, element analysis, and XPS spectral analysis. The polymer had good electrochemical activity as cathode material for rechargeable lithium battery. It showed stable discharge specific capacity about 300 mAh g⁻¹ and discharge voltage above 2 V. The thioether bond was deduced as the functional group. It was proposed that thioether bonds were oxidized to form thioether cations with the help of ether solvent, which offered energy storage.     

Catalytic Activity of Ruthenium Nanoparticles Supported on Carbon Nanotubes for Hydrogenation of Soybean Oil

Ruthenium catalysts supported on multiwalled carbon nanotubes (MCNTs) with different loadings (1% wt, 3% wt, 5% wt) were prepared by reduction with H₂ or NaBH₄ for selective hydrogenation of soybean oil at 338 K and initial pressure of 1.066 MPa. These catalysts were characterized using transmission electron microscopy (TEM), X-ray powder diffraction (XRD), N₂ adsorption–desorption, and H₂-temperature programmed desorption (TPD) techniques. Ru particles were dispersed more homogeneously on the surface of the nanotubes after being reduced with H₂ than with NaBH₄. The catalysts with 3% and 5% Ru loadings had higher hydrogenation activity. The NaBH₄-reduced catalyst had higher cis-isomer selectivity.     

Sensor-based modeling of slurry chemistry effects on the material removal rate (MRR) in copper-CMP process

Material removal rate (MRR) and surface quality in copper-chemical mechanical planarization (Cu-CMP) process are highly sensitive to slurry chemistry parameters, namely, pH, and concentrations of complexing, corrosion inhibiting, and oxidizing agents. Capturing the effects of these slurry parameters on MRR and surface quality in real time through the use of sensor signals is key to ensuring an efficient Cu-CMP process. In this paper, vibration sensor signals collected from the Cu-CMP experiments are used to capture the variations in various slurry parameters as well as their influence on the MRR. Two sensors, namely, a wired accelerometer (Kistler Model 8728A500, sampling at 5 kHz) and a single channel wireless accelerometer (Tmote Sky sensor node, sampling at 500 Hz) are mounted at two distinct locations on a LapMaster-12 bench-top polishing machine. Various statistical features related to time and frequency domain characteristics of the sensor signals are extracted. It was found that principal component regression models relating these features to MRR are significantly more accurate than the conventional statistical regression models that use process parameters (slurry chemistry settings) only to estimate MRR.     

SELECTION OF PROPER EMBEDDING DIMENSION IN PHASE SPACE RECONSTRUCTION OF SPEECH SIGNALS

In phase space reconstruction of time series, the selection of embedding dimension is important. Based on the idea of checking the behavior of near neighbors in the reconstruction dimension, a new method to determine proper minimum embedding dimension is constructed. This method has a sound theoretical basis and can lead to good result. It can indicate the noise level in the data to be reconstructed, and estimate the reconstruction quality. It is applied to speech signal reconstruction and the generic embedding dimension of speech signals is deduced.     

由着色力变化评定着色颜料分散性

介绍了颜料分散性分散和评定方法系列国际标准的概况,选择了一种分散方法和一种评定方法对若干颜料样品进行了试验,并由试验结果对其分散性差异进行了分析比较。     

Magnetocaloric effect of La0.8Ce0.2Fe11.4−xMnxSi1.6 compounds

The effect of Mn addition on the magnetocaloric effect (MCE) of the La_0.8Ce_0.2Fe_11.4?xMn_xSi_1.6 (x = 0.0, 0.1, 0.2, 0.3) compounds was investigated. It was revealed that the transition temperatures of the compounds are sensitive to Mn composition. The temperatures are shifted from 177 to 121 K for Mn composition from 0.0 to 0.3. Moreover, thermal lag and magnetic hysteresis loss of the compounds are reduced largely due to Mn addition. A good MCE with a large and almost constant refrigerant capacity in a large temperature span over 50 K was achieved in the investigated compounds. The investigated compounds are promising magnetic entropy change materials.     

Evolution of fractal features of pores in compacting and sintering process

As an index of molding, the fractal dimension of pores can reflect system varying details as the density. Pores in the powder aggregates with a composition of Fe–2%Cu–0.5%C were researched. The change tendency of dimension of pores as a function of compaction pressure or sintering temperature was investigated. Result indicates that the dimensions of pores in this ternary system decrease both in the process of compacting and sintering. It is convenient to build up some theories by combining compacting and sintering based on the variation of pore dimensions.     

固定转化器泄漏原因分析

采用化学、金相分析方法，结合腐蚀的基本原理，对热交换器的泄漏进行了综合分析，认为造成泄漏的主要原因是循环水中存在大量的氯离子，破坏了蚀剂的保护作用。致使管子产生曜慢穿洞泄漏。     

电动环链葫芦用双速三相异步电动机的研制

本文介绍了电动环链葫芦用三相双速异步电动机的主要性能指标以及在试制过程中遇到的问题.