合成吡啶类化合物用催化剂的再生行为研究

对合成吡啶类化合物用的失活催化剂上的结焦物进行了元素分析 ,并着重对失活催化剂的再生行为进行了研究。得到了不同失活程度催化剂的再生曲线及相同失活程度、不同再生条件下的再生曲线。经回归求得了一简单的再生反应动力学经验方程式 ,其中反应级数为碳含量的 1.16 5级 ,活化能为 4 2 .5 72kJ/mol,计算值与实验值的平均相对误差为 6 .5 %。     

Steric requirements for coal swelling by amine bases

A set of six coals ranging in rank from lignite to hvA bituminous was swollen with a series of alkyl-substituted pyridines and a smaller set of 4-alkylanilines. The size and branching of the alkyl groups was varied and the effect of this variation on the dissolution of the amines in the coal and the resulting coal swelling was measured volumetrically. In a few cases, substituents which hindered the amine nitrogen were studied. The lignite and subbituminous coal have a much higher tolerance to branched, bulky groups than do the bituminous coals. The presence of tertiary groups in a solute strongly inhibits their dissolution in bituminous coals. Bituminous coals behave as if extensive parallel packing of structures occurs. Often, they can accept very large planar groups but have a low capacity for branched groups.     

Synthesis and Spectral Properties of Mixed-Ligand Complexes of Lanthanide Perchlorate with Bis-(phenylsulfinyl)ethane and Organic Lewis Bases

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Laplace spectra as fingerprints for image recognition

In the area of image retrieval from data bases and for copyright protection of large image collections there is a growing demand for unique but easily computable fingerprints for images. These fingerprints can be used to quickly identify every image within a larger set of possibly similar images. This paper introduces a novel method to automatically obtain such fingerprints from an image. It is based on a reinterpretation of an image as a Riemannian manifold. This representation is feasible for gray value images and color images. We discuss the use of the spectrum of eigenvalues of different variants of the Laplace operator as a fingerprint and show the usability of this approach in several use cases. Contrary to existing works in this area we do not only use the discrete Laplacian, but also with a particular emphasis the underlying continuous operator. This allows better results in comparing the resulting spectra and deeper insights in the problems arising. We show how the well known discrete Laplacian is related to the continuous Laplace-Beltrami operator. Furthermore, we introduce the new concept of solid height functions to overcome some potential limitations of the method.     

Formation of Polymeric Lewis Acid–Lewis Base Complexes with Well-defined Organoboron Polymers

The binding of Lewis bases to organoboron polymeric Lewis acids has been studied and the parameters that determine the complexation equilibrium have been investigated, which include (i) the strength of the individual Lewis acids and Lewis bases, (ii) concentration, and (iii) temperature. While the strongly Lewis acidic borane polymers poly(4-bis(pentafluorophenyl)borylstyrene) (PS-BPf) and poly(4-(di-2-thienylboryl)styrene) (PS-BTh) form isolable complexes with strong Lewis bases such as 4-t-butylpyridine (^tPy), a temperature dependent equilibrium is established with weaker bases such as THF. Similarly, the weakly Lewis acidic boronate polymer poly(4-diethoxyborylstyrene) (PS-BOEt) undergoes a temperature dependent equilibrium with the strong Lewis base 4-dimethylaminopyridine (DMAP), while poly(4-pinacolatoborylstyrene) (PS-BPin) does not significantly bind to pyridine bases. Decomplexation of PS-BTh· ^t Py is achieved by treatment with the stronger Lewis acid, B(C₆F₅)₃, thereby confirming the reversible nature of the polymeric Lewis acid–base adducts. This paper is dedicated to Professor Ian Manners in gratitude of his guidance throughout the years and recognition of his scientific accomplishments     

一类特殊本原不可幂定号有向图的广义基

考虑了一类含有三个n—2圈和一个n圈本原不可幂定号有向图的广义基,通过分析图中是否存在寻求的途径及SSSD途径对,运用本原不可幂定号有向图的一些定义和性质,给出了此类图的广义本原指数及广义基.     

高职高专实训基地建设与管理的实践——以昆明冶金高等专科学校实习实训基地建设为例

建设好示范性高职院校实习、实训基地,将有利于促进高等技术应用型人才的培养和学校专业建设,满足地方经济建设的需求。结合昆明冶金高等专科学校实训基地建设的实践,分析了高职院校建设示范性高职教育实习、实训基地的紧迫性,阐述了建设高职院校实习、实训基地的具体措施和方法。     

C~2C~3中无偏的不可扩展最大纠缠基

为了研究在量子计算和量子信息数据处理中起着重要作用的不可扩展最大纠缠基和无偏基,首先在C2C3空间上研究了不可扩展的最大纠缠基.其次构造了C2C3上两组无偏的不可扩展的最大纠缠基,并给出其一般形式,从而推广了文[9]在C2C3空间上构造的无偏基的结论,给出了更一般化的构造方法.     

席夫碱结构对Cu缓蚀作用的影响

用自组装技术使席夫碱在Cu表面自组装成膜,用扫描电子显微镜(SEM)、交流阻抗方法及量子化学法研究了席夫碱结构对Cu缓蚀作用的影响.结果表明:席夫碱类化合物在发挥其活性时应以接受电子为主,此类化合物的亚胺或甲亚胺特性基团(-RC=N-)和苯环上的-OH是该类化合物的主要活性区,席夫碱苯环的-H被给电子基团取代会提高对Cu的缓蚀效率,且取代基团越靠进-C=N-,形成的螯合物越稳定,缓蚀效率越高.     

软件类专业校企合作共建实训基地研究

从国家发展时工程型人才需求出发,分析了工程应用型人才培养的必要性,以及校企共建实训基地在工程应用型人才培养方面所起的作用.结合高校软件类专业工程应用型人才培养的现状、特点和要求,以及软件类专业实训基地的特点,提出了当前软件类专业校企合作实训基地的模式,探讨了建立校企合作实训基地必须要考虑和解决的问题.