Isomerization of 4-Amino-6-tert-butyl-3-methylthio-1,2,4-triazin-5(4H)-one with Base

4-Amino-6-tert-butyl-3-methylthio-1, 2, 4-triazin-5 (4H)-one I, named as Metribuzin1, is an excellent selective herbicide. In the course of studying the reaction of I, we have found an unexpected reaction. We have attempted to prepare 6-tert-butyl- 4-methylamino-3-methylthio-1, 2, 4-triazin-5 (4H)-one II from I with methyl iodide in the presence of sodium hydroxide in aqueous methanol, surprisingly, instead of II the product III 4-amino-6-tert-butyl-3, 4-dihydro-2-methyl-3-thioxo-1, 2, 4-…     

氨基改性复合凝胶的制备及吸附木家具中VOCs性能研究

采用改性共溶胶-凝胶法将壳聚糖与无机相的二氧化硅制备形成氨基改性交联复合凝胶并添加入聚氨酯涂料(PU漆中)和木基材中。结果表明:制得的氨基改性交联复合凝胶孔径大小为12μm^16μm,既保留了凝胶的轻质结构和介孔特性,又含有壳聚糖所具有的活泼有机基团,对PU漆和木基材的VOCs都有一定吸附作用,其中对于杉木中VOCs吸附作用最强,达到了72.86%。说明此方法具有一定的可操作性,为木家具的污染防治增添了一种新的方法,具有规模化的应用前景。     

新型小分子抗凝血药物的合成、作用机制及构效关系研究进展

以达比加群酯为代表的Ⅱa因子抑制剂和以利伐沙班为代表的Xa因子抑制剂在抗凝血药物中起到了重要作用。本文综述了已上市的新型小分子抗凝血药物的的合成、作用机制及其构效关系,并对其进行了深入分析,同时对此类药物的发展趋势和前景进行了展望。     

Parameter Estimations in BurrⅫ Model Using Masked Data

We consider a series system of two independent and non-identical components which have different BurrⅫ distributed lifetime.The maximum likelihood and Bayes estimators of the parameters of the system＇s components are obtained based on masked system life test data.The conclusion is that the Bayes estimates are better than the maximum likelihood estimates in the sense of having smaller mean squared errors.     

无机功能复合固体课题组工作简介

<正>无机功能复合固体是指两个或多个固体通过化学键键合而形成的复合相，与传统单相合成相比，固体复合后发生了晶格畸变、轨道耦合、电子自旋和电荷转移等变化，能够实现材料原有功能的增强甚至产生新的功能。因而，在化学、能源、材料和电子等领域具有广泛的应用。     

非平衡电桥原理热敏电阻温度计的计算机校准与标定

非平衡电桥原理热敏电阻温度计设计原理的基础上,利用传感器及数据处理软件获得准确的温度-电压数据曲线,并利用最值查找、斜率标定、曲线拟合等数据处理工具对数据进行有效处理与标定。相对于传统数据处理及标定方式,具有更高的准确性。     

Hilbert空间中对偶框架的扰动性

在Hilbert空间中框架扰动的基础上,运用算子论的方法,给出对偶框架扰动性的一些结果及证明.     

平面金属介质复合体的负磁化率(英文)

We report a new type of planar metamaterial consisting of a pair of homogeneous parallel plates separated by a thin medium. Strong magnetic response and negative effective permeability are observed in the materials at wavelengths from 6.9 μm to 5.8 μm. The resonant wavelength and the value of the negative permeability can be tuned by varying the structure dimensions. Such planar metamaterials can be easily fabricated with mature thin film technology and are of great potential for device applications.     

Synthesis and electroluminescent properties of naphthalimide derivatives

Naphthalimide derivatives, N-ethyl-4-acetylamino-l ,8-naphthalimide (EAAN) and polymer with N-propyl-4-acetylamino-l,8-naphthalimide (PAAN) side-chain (P-PAAN) were successfully synthesized. Electroluminescent devices of ITO/PVK(120nm)/EAAN(50nm)/Al(150nm) (Ⅰ) and ITO/PVK P-PAAN( 10:1) (50nm)/Al(150nm) (Ⅱ) constructed with EAAN and P-PAAN as the emitting layer were investigated, whereas the single-layer devices of ITO/EAAN or P-PAAN(50nm)/Al(l50nm) (Ⅲ) were not observed to have any e-mission light. The emission results revealed that the exciton recombination formed by positive and negative charge carriers injected from electrodes of devices Ⅰ and Ⅱ was much more balanced than that of devices Ⅲ, which implied that naphthalimide derivatives are a new type of electron-transporting materials with high performance. The electron-transporting properties of naphthalimide derivatives were also elucidated by investigation of the electroluminescent behaviors from both devices of ITO/PPV (80nm)/Al and ITO/P     

Catalytic Hydrogenation of Diacetyl Monoxime to Tetramethylpyrazine with the Soluble Transition Metal Catalysts

Tetramethylpyrazine(TMP)isausefulcompoundinfoodindustry'.InrecentyearsithasbeenfoundasanactiveingredientinChuanxi0ng(ligusticumwallichiifranch),whichisatraditionalChineseherb.NowTMPhasbeenwidelyusedinthetreatmentofpatientswithcerebralischemicdiseasesinChina2.OneoftheimportantmethodsforthepreParationoftetramethylpNazineistheselfcondensati0noftwomoleculesof2-aminobutanoneto2,5-dihydrotetramethlipyrazineandsubsequentoxidati0ntoTMP3.2-Aminobutanoneispreparedusuallyinsituviathereductionofthec…