WxC/SBA-16催化剂的制备、表征及催化加氢脱硫性能

以正硅酸乙酯为硅源, 仲钨酸铵为钨源, P123和F127为混合模板剂,采用水热晶化法一步合成了不同钨含量(以n(Si):n(W)表示)的WO3/SBA-16, 然后经甲烷/氢气(V(CH4)/V(H2)=1/4)混和气体程序升温还原碳化(TPC), 制备出了WxC/SBA-16(x=1, 2)催化剂. 采用XRD、N2-吸附/脱附、TEM和FTIR等分析测试技术对样品的结构进行了表征, 并以噻吩作为模型化合物, 对WxC/SBA-16催化剂的加氢脱硫催化活性进行了评价. 结果表明, 在一定钨含量的条件下, WO3/SBA-16和WxC/SBA-16样品仍然保持立方笼状介孔结构, 当n(Si):n(W)为30-10时, 碳化钨的物相为W2C; n(Si):n(W)为7.5时, 碳化钨的物相为W2C和WC. WxC/SBA-16催化剂表现出了良好的加氢脱硫催化性能.     

反丁烯二酸蔗糖甲酯的表面活性作用

本文报道了具有抑菌和乳化作用的双功能反丁烯二酸蔗糖甲酯(sucrose methyl fumarate,SMF)的合成。分子结构式示意如下。其中SUC表示蔗糖分子结构母体，n为蔗糖分子中羟基参与酯化的数目，即酯化度。它的抑菌性能和乳化性能均随其酯化度的变化而变化。本文研究抑菌作用较强的酯化度为5．5的SMF的表面活性作用。反丁烯二酸蔗糖甲酯的合成、表征及抑菌特性的研究另文报道。     

硫化态NiW/γ-Al2O3加氢脱硫催化剂的微观结构

采用拉曼光谱和X－射线衍射技术，对硫化态NiW/γ-Al2O3加氢脱硫催化剂进行了表征。实验结果表明，硫化态NiW/γ-Al2O3催化剂表面类WS2微晶主要以3R形式存在。对其微观结构进行分析，认为具有堆叠层数稍多且片晶较短的3R型WS2微晶与镍形成Ni-W-S活性相的催化剂，具有较高的加氢脱硫活性。     

一次脉冲偏磁场作用下硬磁泡的形成

实验研究了一次脉冲偏场作用下外延石榴石膜硬磁泡的形成规律。通过实验和计算,证明了硬泡畴壁中同号的VBL一般地说并非一个脉冲产生一对。通过双重曝光照相法揭示出软畴段的硬化与畴段运动形式的关系,发现了最适于硬泡形成的两种运动形式,并阐明了“软硬磁泡形成的分界场”H_[b]的物理意义。 关键词：     

Determination of bioelectrochemical parameters of red cell using a piezoelectric crystal sensor

Based on the impedance behavior of red cell at high frequency, the frequency response of series piezoelectric crystal sensor in the red cell suspension was derived and verified experimentally. A method of using piezoelectric crystal sensor to determine the conductivity of the interior of the cell was proposed. The experimental results show that the mean conductivity of rabbit red cell cytoplasm was 0.269 S/m and the mean shape factor of red cell was 2.05.     

多极矩分析的教与学探讨

多极矩展开是一种重要的分析方法，由静态电磁场多极矩展开得到的电多极子和磁多极子是基础而重要的物理模型.多极矩展开表示方法、多极子模型与多极子以及电磁场相互作用是多极矩分析教学的核心内容.本文从上述三个方面展开探讨：给出静态电场和静态磁场的内部和外部多极展开；讨论多极矩展开的不同表示的关系；强调多极子是基于远源处电磁势对源进行的等效点源替代；最后，从受力与力矩方面考察电多极子和磁多极子与外电磁场的相互作用.     

Total saponins from stems and leaves of Panax quinquefolius L. ameliorate podophyllotoxin-induced myelosuppression and gastrointestinal toxicity

Podophyllotoxin (POD), a natural lignan distributed in podophyllum species, possesses significant antitumor and antiviral activities. But POD often causes serious side effects, such as myelosuppression, gastrointestinal toxicity, neurotoxicity, hepatic and renal dysfunction, and even death, which not only hinder its clinical application but also threaten the patient's health. Therefore, an effective treatment against POD-induced toxicity is important. Our preliminary study found that the total saponins from the stems and leaves of Panax quinquefolius L. (PQS) could significantly reduce the death of mice caused by POD. To reveal how PQS can alleviate POD-induced toxicity, further study was needed. Peripheral blood cell analysis, diarrhea score, and histological examination demonstrated that PQS could relieve myelosuppression and gastrointestinal side effects induced by POD. Then, metabolomics was performed to investigate the possible protective mechanism of PQS on POD-induced myelosuppression and gastrointestinal toxicity. Metabolomics analysis showed that metabolic changes caused by POD could be reversed by PQS to some extent; 23 metabolites altered significantly after POD exposure, and 11 metabolites significantly reversed by PQS pretreatment. Metabolic pathway analysis suggested that PQS might exhibit its protective effects by rebalancing disordered arginine, glutamine, and unsaturated fatty acid metabolism.     

近红外分光光度法测定高氯酸羟胺中的水含量

建立近红外分光光度法测定高氯酸羟胺中的水含量.以四氢呋喃水溶液为标准溶液,以四氢呋喃为参比溶液,测定系列标准溶液于波长1920 nm处的校正吸光度,标准曲线线性方程为y=113.76x+0.0065,相关系数为0.9996.样品重复性测定相对标准偏差小于2％(n=5),样品加标回收率为98.06％～99.92％.该方法操作简便.     

Determination of six benzotriazole ultraviolet filters in water and cosmetic samples by graphene sponge-based solid-phase extraction followed by high-performance liquid chromatography

Analytical and Bioanalytical Chemistry - An approach for fabrication of graphene sponge (GS)-based solid-phase extraction (SPE) followed by high-performance liquid chromatography (HPLC) with...