2—甲基—1，4—萘醌对DNA光敏损伤的诱导作用

选择波长337nm的激光作为激励光源，借助凝胶电泳研究了2－甲基－1，4－萘醌诱导的DNA光敏损伤。结果表明：在氧气饱和、脱氧条件下光敏损伤显著，DNA损伤主要与光子剂量、核酸与萘醌浓度比及DNA存在形式有关。     

异丁醛合成2,4,6-三异丙基-1,3,5-三噁烷的研究

本文以异丁醛为原料在杂多酸催化剂的作用下，环化合成了无毒升华剂2，4，6－三异丙基－1，3，5－三恶烷，考查了各种反应条件的影响，确定以磷钨酸为催化剂时的最佳反应条件：反应温度25℃，催化剂用量1．5％，反应时间2．5h，产物的收率达84％以上。     

2-氨基-4-溴-5-氯苯甲酸的合成

以硝基苯为原料，经溴化、还原、缩合、环合、氯化和氧化等６步反应合成了２－氨基－４－溴－５－氯苯甲酸，总收率为１１．７％。     

6-硝基-1,2-重氮氧基-4-萘磺酸及其杂质的高效液相色谱分析

本文以反相高效液相色谱对6-硝基-1，2-重氮氧基-4-茶磺酸及有机杂质进行了分析，选择了流动相、离子对、检测波长，研究了不同牌号ODS C18色谱柱的重现性，得到了6-硝基-1，2-重氮氧基-4-萘磺酸及杂质(1，2-重氮氧基-4-萘磺酸、8-硝基-1，2-重氮氧基-4-萘磺酸)的相关系数分别为：0.99956、0.99991、0.99317；标准偏差和变异系数分别为：0.214250％、0．016890％、0．564557％、0.012695%、0.488467％、0.014560％得到了准确度数据，确定了最小检出量。     

STUDY ON PERMEATION OF ACETONE/NITROGEN MIXED GAS THROUGH AL2O3 MICROPOROUS MEMBRANES: MOLECULAR DYNAMICS

In this work, by applying Materials Studio 2.2 software package, molecular dynamics (MD) was performed to investigate the dynamic processes of 1:4 acetone/nitrogen mixed gas permeating through different Al₂O₃ microporous membranes. Three systems were modeled by considering different box lengths, microporous sizes, and textures of Al₂O₃ membranes to compare different permeation behaviors. In each system, initial mixed gas contained 20 acetone molecules and 80 nitrogen molecules, and its density was set to 0.1 g/cm³. Analysis on the concentration profiles of nitrogen molecules (N2) and acetone molecules (Ace) in each system at different sampling times was implemented to discuss the permeation behaviors of smaller N2 and larger Ace. The results showed that adsorption and diffusion occurred synchronously but adsorption was dominant for acetone molecules and that the adsorption on the floor surface of the feed gas region more easily reached equilibrium (local equilibrium) than the diffusion and the adsorption on the ceiling of the initially vacuum region. Furthermore, for nitrogen, adsorption followed diffusion. Higher temperature is in favor of the enrichment of acetone on the floor surface of the feed gas region but against the adsorption of nitrogen. The adsorptive layer was found to be a double-layer with COMPASS force field and to be a monolayer with PCFF force field.     

Enhancement by SO2 of initial activity for selective catalytic reduction of NO with CH3OH over \gamma-alumina

The effect of SO₂ on catalytic activity for NO reduction to N₂ by methanol in excess oxygen over $\gamma$ -alumina has been investigated. SCR activity increased initially upon exposure of a fresh $\gamma$ -alumina catalyst to SO₂ which is attributed to formation of Brønsted acid sites. Longer exposure to SO₂ leads to a decline in catalytic activity to a lower steady-state NO_x reduction activity which is independent of the SO₂ content in the feed gas.     

单参数Wilson方程预测C_9-DMP体系汽液平衡

根据实测γ~∞_1用单参数Wilson方程预测均三甲苯-DMP和偏三甲苯-DMP二元体系汽液平衡,并推算均三甲苯-偏三甲苯-DMP三元体系的汽液平衡,与实测数据比较,均获得良好结果。     

富氢气氛中CO的选择性氧化——碱金属助剂对Pt/γ-Al2O3催化剂性能的影响

研究了碱金属助剂对Pt/γ-Al₂O₃催化剂选择性氧化富氢气氛中CO性能的影响。结果表明，碱金属助剂的引入对Pt/γ-Al₂O₃的催化性能有不同程度的改变，其中添加Na和K后，能明显提高低温下的CO转化率。     

Synthesis of Dimethyl Carbonate from Methanol and Carbon dioxide using Potassium Methoxide as Catalyst under Mild Conditions

Pd-supported on WO₃–ZrO₂ (W/Zr atomic ratio=0.2) calcined at 1073 K was found to be highly active and selective for gas-phase oxidation of ethylene to acetic acid in the presence of water at 423 K and 0.6 MPa. Contact time dependence demonstrated that acetic acid is formed via acetaldehyde formed by a Wacker-type reaction, not through ethanol by hydration of ethylene.     

Synthesis and characterization of aromatic polyisoimides derived from PMDA and para-diamines. An approach to in situ generated rigid-rod molecular composites

A new concept for the processing and fabrication of rigid-rod molecular composites aiming at the elimination or minimization of phase separation is proposed. This approach calls for a coil-like aromatic polyisoimide which is soluble and compatible with an amorphous matrix polymer or thermosettable oligomer and can undergo facile transformation to the corresponding rigid-rod polyimide in solid composite state, thus imparting the inherently high strength/high modulus properties to the final form. To this end, various synthetic routes were explored to obtain para-diamines which could afford high molecular weight and aprotic-solvent-soluble polyisoimides upon polymerization with pyromellitic dianhydride (PMDA). Four such polyisoimides were prepared, with their inherent viscosities ranging from 0.25 to 1.89 dl g⁻¹ in dimethylacetamide at 30°C. Facile thermally induced isoimide-imide conversion was demonstrated by solid-state (film) Fourier transform infrared spectroscopy. A preliminary evaluation of the compatibility of the polyisoimide/matrix resin was made. In one instance, a film prepared from the polyisoimide derived from PMDA and 3,3′,5,5′-tetramethylbenzidine (TMB) showed no visually detectable phase separation.