丙烯酸甲酯-氰尿酸三烯丙酯共聚物的合成及其孔结构的研究Ⅰ.

氰尿酸三烯丙酯(TAC)与丙烯酸甲酯(MA)在致孔剂如环己烷、正丁醚或甲苯-汽油(200~#)存在下,用悬浮聚合得到一系列大孔共聚物。对这些共聚物孔结构的研究表明,它们的平均孔径达10000—80000(?),同时研完了致孔剂的分子结构和用量对共聚物孔结构的影响,并初步讨论特大孔共聚物形成的机理。     

碳苷合成研究——3-β-D-吡喃木糖基-1,2,4-氧杂二唑类化合物的合成

本文研究了1-(2,3,4-三-O-苯甲酰-β-D-吡喃木糖基)-偕氨基肟与酸酐及酰氯的缩合反应,探讨了不同缩合剂、不同取代基对环合反应的影响,与酸酐反应可以一步完成,且收率较好;与酰氯反应分两步进行,第一步酰化,第二步脱水环合,芳环上取代基的电性效应,决定环合反应的难易,并证明了该环系的碳苷对酸、碱、热具有化学稳定性,本文合成了12个氧杂二唑类木糖碳苷及2个木糖基化的开环产物,通过光谱及元素分析,确定了它们的结构。     

THE EFFECTS OF PERFUSION OF LATERAL VENTRICLE WITH CaCl_2 ON THE FEBRILE RESPONSE AND cAMP CONTENT IN PLASMA AND CEREBROSPINAL FLUID DURING LP-INDUCED FEVER

Artificial cerebrospinal fluid (c.s.f.) containing 40 mmol/L excess calcium was perfus-ed through the lateral ventricles of New Zealand white rabbits in order to reduce the Na~+/Ca~(++) ratio in the brain and the effects on both the febrile response and adenosine cyclic mo-nophosphate (cAMP) concentration in plasma and c.s.f, during leucocytic pyrogen (LP)-induced fever were observed. The results showed that cAMP concentration in c.s.f, increas-ed significantly during LP-induced fever while the cAMP level in Plasma remained unchang-ed, and the perfusion of artificial c.s,f, containing 40 mmol/L excess calcium can signif-icantly inhibit not only the febrile response but also the increase in c.s.f, cAMP level,while there appears no effect on plasma cAMP concentration, thus demonstrating that theincrease of Na~+/Ca~(++) ratio causing the increase of cAMP content in the brain may be anessential link in the pathogenesis of LP-induced fever.     

THE SEPARATION,PURIFICATION AND DECOLORIZATION OF NEW ANTIBIOTICS-MILUPEINAN USING ADSORPTION RESIN

1. INTRODUCTION Fig.1 The Chemical Structure of Milupeinan As a new type of antibiotics Milupeinan, not only possesses antibacterial activities against a wide range of Gram-positive and Gram-negative bacteria, but also higgh stability under th…     

呋喃丹的薄层扫描定量分析研究

采用双波长反射吸收薄层扫描法对呋喃丹进行了定量分析方法的研究。方法的线性范围为2~200μg,线性相关系数为0.997;呋喃丹的检出限为0.3μg,回收率为96.94%~100.38%,相对标准偏差为1.73%。本方法快速、简单、易行。     

小波包去噪信号的分形特征

将分形理论与小波包滤波相结合，用盒维数的大小来评判信号曲线的滤波情况。随着小波包分解尺度的增大，滤波后信号曲线的盒维数逐渐减小，并最后趋于稳定值。因此可以根据盒维数-分解尺度曲线来选择最佳分解尺度。对仿真含噪信号进行了滤波实验，结果表明：即使在信噪比低至0．5时仍能得到较好的结果，并且该法用于毛细管电泳实验数据的处理结果同样令人满意。     

渗透蒸发脱盐的研究

将选择性透过膜和汽化相结合的分离过程是当前的研究热点,其中采用低热导率、疏水性多孔膜的过程称膜蒸馏,而采用非多孔性半透膜的过程则称渗透蒸发。将该分离过程用于盐水脱盐已有很多报道,并已建成中试设备,但采用的大多是膜蒸馏,所用膜的成本很高。本文研究制了一种价廉并带有致密层的非对称性含钠离子聚乙烯醇(PVA)-聚乙二醇(PEG)分离膜,并用该膜对渗透蒸发脱盐进行了初步研究。 1 实验 1.1 膜制备 将一定配比的PVA与PEG及钠盐水溶液在适当温度下混溶,加入适量醛类交联剂,数分钟后在选定的基材上流涎成膜,室温下自然晾干,再经35℃～50℃控温红外线干燥。 1.2 膜结构及脱盐流程 扫描电镜拍摄的膜断面形貌图像(图1)表明,该膜为非对称膜,表层厚约13μm,其中厚约2～3/μm的上表层为疏松结构,下表层为致密结构。将该类膜用于3.5％NaCl水溶液脱盐,运行4h后再漂洗、干燥作断面Na元素波谱线分析(图2)发现,在膜下层(右侧)厚约30μm层内检测不到Na元素。脱盐流程见文献。     

An Improvement of IAP OGCM for the Pacific Ocean Circulation and Its Simulated Results

Based on the oceanic CCM with standard stratification subtraction but without the rigid-lid approximation designed in Institute of Atmospheric Physics (IAP OGCM) and its numerical modelings for the large-scale ocean circulation, a numerical model for the Pacific Ocean is developed with higher resolution (2.5°×2° in the longitude and latitude, 8 layers in the vertical),the realistic coastline geometry,the smoothed bottom topography and the Richardson number dependent vertical mixing parameterization.The splitting time integration scheme of the barotropic and baroclinic modes is adopted in the model. The numerical simulation under the annual mean atmospheric forcing shows that the model performance is improved substantially compared with the previous low resolution version.This free surface model,in particular, successfully simulates the well-known ridge-trough structure in the sea level, i.e. the equatorial trough, the equatorial ridge near 3°N, the north countercurrent trough between 8°N and 10°N,     

新型氮杂2-β萘基苯并噁唑分子设计与光物理性质的研究

为了寻找新的有效光敏材料，设计了一系列新型氮杂2-β萘基苯并恶唑分子，用改进的PPP-SCF-CI方法，对设计分子的第一激发单线态，三线态，振子强度和跃迁矩等光物理性质进行了较为详细的研究，筛选出了一些新型的具有特殊光物理特性的分子，并预测了有可能产生新型氮杂2-β萘基苯并恶唑分子类光敏感功能材料的取代基部位。     

便携式GC-MS在应急监测工作中的应用

在2006年一次突发性有机物污染事故中,运载30吨液态危险品(苯乙烯)的槽罐车,发生侧翻,部分运输物质泄漏到农田中,用便携式GC-MS进行应急监测,取得了良好的效果.