Investigation of the physicochemical properties of CuO-CoO binary metal oxides supported on γ-Al2O3 and their activity for NO removal by CO

The dispersion and physicochemical behaviors of CuO-CoO binary metal oxides supported on γ-Al(2)O(3) were characterized by XRD, LRS, XPS, H(2)-TPR, and in situ FT-IR techniques. Their activities were evaluated by NO-CO model reaction. The results indicated that (a) for lower loadings, CuO and CoO were able to be highly dispersed on the surface of γ-Al(2)O(3) support; (b) the interaction between dispersed CuO and CoO upon γ-Al(2)O(3) was discussed in the view of incorporation model. According to this model and obtained results, the surface dispersed Cu-O-Co species were considered to exist on the surface of γ-Al(2)O(3); (c) CO or/and NO adsorption FT-IR results evidenced that the surface dispersed copper species could be reduced to lower valence by CO and the NO adsorption species converted with the increase in the temperature; (d) the surface dispersed Cu-O-Co species could be reduced to active Cu-□-Co species by CO among the mixture atmosphere. The formation of the surface synergetic oxygen vacancy (SSOV) was a crucial factor in the process of the NO-CO reaction. And a possible reaction pathway was tentatively proposed to discuss the NO-CO reaction based on all of these results.     

Antioxidant peptides from <Emphasis Type="Italic">Cicer arietinum</Emphasis> of Xinjiang,China

Four peptides of molecular weights 1.148, 4.68, 5.41, and 9.086 kDa with antioxidant activity were isolated from chickpea sprout using two-step ion-exchange chromatographic and HPLC techniques for the first time. The partial N-terminal amino acid sequences of the peptide named YZDBCM-1 (9.086 kDa) was determined as H₂N^1-15-H₂N-Ala-Ile-Thr-Cys-Gly-Arg-Val-Ser-Ala-Ala-Leu-Ala-Pro-Pro-Leu using the Edman automated sequencing apparatus, which was a new peptide rich in alanine. It was shown that the antioxidant activity of the peptide YZDBCM-1 was IC₅₀ 156.2 μg/mL (17.2 μmol/L) to the free radical of ABTS.     

Selective oxidation of unsaturated alcohols catalyzed by sodium nitrite and 2,3-dichloro-5,6-dicyano-1,4-benzoquinone with molecular oxygen under mild conditions

We have developed a simple and practical process for the oxidation of alcohols to the corresponding carbonyl compounds by using a low catalytic amount of DDQ, NaNO(2) as a cocatalyst, and molecular oxygen as terminal oxidant. Nitric oxide generated in situ by NaNO(2) in the presence of AcOH is essential for the realization of the catalytic cycle at room temperature. The practical utility of this catalytic process has been demonstrated in the gram-scale oxidation of cinnamyl alcohol.     

Exact quantum scattering study of the H + HS reaction on a new ab initio potential energy surface H2S (3A")

We present an exact quantum dynamical study and quasi-classical trajectory (QCT) calculations for the exchange and abstraction processes for the H + HS reaction. These calculations were based on a newly constructed high-quality potential energy surface for the lowest triplet state of H(2)S ((3)A"). The ab initio single-point energies were computed using complete active space self-consistent field and multi-reference configuration interaction method with a basis set of aug-cc-pV5Z. The time-dependent wave packet (TDWP) method was used to calculate the total reaction probabilities and integral cross sections over the collision energy (E(col)) range of 0.0-2.0 eV for the reactant HS initially at the ground state and the first vibrationally excited state. It was found that the initial vibrational excitation of HS enhances both abstraction and exchange processes. In addition, a good agreement is found between QCT and TDWP reaction probabilities at the total momentum J = 0 as a function of collision energy for the H + HS (v = 0, j = 0) reaction.     

Hybrid theoretical,experimental and numerical study of vibration and buckling of composite shells with scatter in elastic moduli

Hybrid theoretical, experimental and numerical method is proposed for free vibration and buckling of composite shell with unavoidable scatter in elastic moduli. Based on the Goggin’s measurement techniques, the elastic moduli for material T300-QY8911 are measured, and a set of experimental points are obtained. The measurements of elastic moduli are quantified by either (1) the smallest ellipsoid and (2) the smallest four-dimensional uncertainty hyper-rectangle. Then uncertainty propagation in vibration and buckling problems of composite shell by ellipsoidal analysis and interval analysis are, respectively, studied from the theoretical standpoint. Comparison between these analyses is performed numerically.     

Chemical Species of Iodine in Some Seaweeds II. Iodine-Bound Biological Macromolecules

The distribution of iodine in various biological macromolecules in Sargassum kjellmanianum was studied using neutron activation analysis combined with chemical and biochemical separation techniques. The results indicate that iodine is mainly bound with protein, part of iodine with pigment and polyphenol, and little with polysaccharides, such as algin, fucoidan and cellulose. This result is significant for the mechanism of enriching iodine of algae and utilization of alga iodine.     

基于配置关联关系的信息系统误配置检测技术

随着软件系统变得更加复杂和可配置,由于错误配置而导致的故障正成为一个关键问题。 这种故障通常会带来较为严重的经济损失、安全隐患和功能故障。 此外,对于这种故障的诊断和修复需要跨越软件本身及其运行环境进行分析,使得其困难且昂贵。本文基于配置项之间隐含的关联关系及其运行环境,设计了基于信息系统配置关联关系的配置错误检测系统技术,利用给定的大量样本配置训练,形成配置项关联关系与检测规则,通过发掘信息系统各组件配置项之间的关联关系并利用这种关联进行配置项交叉检验,能够有效检测系统的错误配置。通过模拟测试表明,本方法的错误配置检出率达到了90%以上,在大型企业中具有广泛的应用前景。     

Feasibility study of iron mineral separation from red mud by high gradient superconducting magnetic separation

The disposal of bayer red mud tailings now seriously threats the environment safety. Reduction and recycling of red mud is now an urgent work in aluminum industry. High gradient superconducting magnetic separation (HGSMS) system was applied to separate the extreme fine RM particles (<100 μm) into high iron content part and low iron content part. Two sorts of RM were fed in the HGSMS. The iron oxide contents in concentrates were about 65% and 45% when RM 1# and RM 2# were fed respectively. Meanwhile, the residues contained 52.0% or 14.1% iron oxide in residues after eight separation stages when RM 1# and RM 2# were fed respectively. The mass recovery of iron concentrates was about 10% after once separation process regardless of RM 1# or RM 2# was fed. Extreme fine particles (<10 μm) could be captured in the HGSMS. Intergrowth of Fe and other elements is disadvantages for iron mineral separation from RM by HGSMS. Some improvement should be studied to enhance the efficiency of iron separation. It is possible for HGSMS to separate RM into high iron content part and low iron content part, the former part could be used in iron-making furnace and the later part could be recycling to sintering process for alumina production or used as construction material.