Synthesis and Optoelectronic Applications of dπ–pπ Conjugated Polymers with a Di-metallaaromatic Acceptor

The development of conjugated polymers especially n-type polymer semiconductors is powered by the design and synthesis of electron-deficient building blocks. Herein, a strong acceptor building block with di-metallaaromatic structure was designed and synthesized by connecting two electron-deficient metallaaromatic units through a π-conjugated bridge. Then, a double-monomer polymerization methodology was developed for inserting it into conjugated polymer scaffolds to yield metallopolymers. The isolated well-defined model oligomers indicated polymer structures. Kinetic studies based on nuclear magnetic resonance and ultraviolet–visible spectroscopies shed light on the polymerization process. Interestingly, the resulted metallopolymers with d_π–p_π conjugations are very promising electron transport layer materials which can boost photovoltaic performance of an organic solar cell, with power conversion efficiency up to 18.28 % based on the PM6 : EH-HD-4F non-fullerene system. This work not only provides a facile route to construct metallaaromatic conjugated polymers with various functional groups, but also discovers their potential applications for the first time.     

3-Blocks with Abelian Defect Groups Isomorphic to Z_(3~m)×Z_(3~n)

Let G be a finite group and let p be a fixed prime number. Let B be a p-block of G with defect group D. In this paper, we give results on 3-blocks with abelian defect groups isomorphic to Z3m ×Z3n. We are particularly interested in the number of irreducible ordinary characters and the number of irreducible Brauer characters in the block. We calculate two important block invariants k(B) andl(B) in this case.     

长度测量中干涉条纹的自动识别技术研究

利用激光干涉与数字图像处理技术以及应用FFT分析干涉条纹方法,分析并解决了测量端面长度标准中条纹图的处理技术,应用这种方法不但提高了测试过程的自动化程度,而且大大地提高了测量结果的精度,并给出了最典型的端面长度标准量块的干涉条纹小数部分的实测结果.     

Multifunktionellebis-(trifluormethyl)-substituierte Synthesezwischenstufen aus 4,4-Bis-(trifluormethyl)-1-oxa-3-azabuta-1,3-dienen viaBaylis-Hillman Reaktion

Summary TheBaylis-Hillman reaction of 4,4-bis-(trifluoromethyl)-1-oxa-3-azabuta-1,3-dienes with acrolein, methyl vinyl ketone, ethyl vinyl ketone, acrylonitrile, ethyl acrylate, andn-butyl acrylate provides useful multifunctional partial fluorinated building blocks in one step.

Prof. Dr. Rolf Huisgen zum 75. Geburtstag gewidmet     

首尾差分块循环矩阵的性质及非奇异性

本文提出了首尾差分块循环矩阵的概念,包括(n,m)型首尾差分块循环矩阵和(n,m)型二重首尾差分块循环矩阵,讨论了它们的性质,并给出了判定其非奇异性的充要条件.     

Modelling the dynamics of large block structures

This paper summarizes the main critical points that arise when the problem of modelling the dynamics of block structures is tackled. In the first sections, a rigorous formulation of dynamics and impact problem is presented for a single rigid block freely supported on rigid ground, in order to illustrate the basic difficulties concerning the modelling of more complicated structures. Then, a critical review is presented on the numerous researches performed on this subject and the results achieved, and the problems still open, are put in evidence.

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Sommario In questo lavoro, si illustrano i punti salienti e critici che devono essere affrontati nella modellazione del comportamento dinamico di structture costituite da grandi blocchi assemblati a secco. Nei primi paragrafi, viene presentato e discusso il problema generale della dinamica e dell' urto del blocco singolo semplicemente appoggiato su suolo rigido: è questa la base necessaria per affrontare in modo rigoroso la modellazione di strutture più complesse. Viene quindi presentata una rassegna critica di vari modelli proposti in letteratura, evidenziando i problemi risolti e quelli ancora aperti.

     

Metal-mediated Discrete Supramolecular Assemblies of Porphyrins

There is substantial recent interest worldwide in the construction of multiporphyrin assemblies which can either mimic naturally occurring multichromophore aggregates, such as the photosynthetic reaction center and the light harvesting complex of purple bacteria, or which can be used as electron- and/or energy-transfer molecular devices for advanced technological tasks. The metal-mediated self-assembly approach, which exploits the formation of coordination bonds between peripheral basic site(s) on the porphyrins and metal centers, has recently allowed the design and preparation of sophisticated supramolecular architectures whose complexity and function begin to approach the properties of naturally occurring systems. Within this framework, meso -pyridyl/phenyl porphyrins (PyPs), or strictly related chromophores, can provide geometrically well-defined connections to as many as four metal centers by coordination of the pyridyl groups. Several discrete assemblies of various nuclearities, in which the pyridylporphyrins are linkers binding metalloporphyrins and/or coordination compounds, have been constructed in recent years. Our contribution to this field is reviewed, with the aim of providing insight into the design of new, more elaborated architectures of higher order.     

Some Properties of Minimal Splines

S. G. Mikhlin was the first to construct systematically coordinate functions on an equidistant grid solving a system of approximate equations (called “fundamental relations”, see [5]; Goel discussed some special cases earlier in 1969; see also [1, 4, 6]). Further, the idea was developed in the case of irregular grids (which may have finite accumulation points, see [1] ). This paper is devoted to the investigation of A-minimal splines, introduced by the author; they include polynomial minimal splines which have been discussed earlier. Using the idea mentioned above, we give necessary and sufficient conditions for existence, uniqueness and g-continuity of these splines. The application of these results to polynomial splines of m-th degree on an equidistant grid leads us, in particular, to necessary and sufficient conditions for the continuity of their i-th derivative (i = 1, ?, m). These conditions do not exclude discontinuities of other derivatives (e.g. of order less than i). This allows us to give a certain classification of minimal spline spaces. It turns out that the spline classes are in one-to-one-correspondence with certain planes contained in a hyperplane.     

生物信息学Blocks和Motifs方法在病毒研究中的应用

评述了生物信息学分析方法及几种主要分析软件的基本原理；提出了蛋白质、核酸序列分析、搜索Blocks和Motifs的基本方法，并提出把病毒信息学作为入门推动整个生物信息学发展的观点．     

On the Vertices of Simple Modules for Symmetric Groups

In this article, we are concerned with the computation of vertices of some series of simple modules for the symmetric group of n letters in odd characteristic. In the first, the second, and the third section of this work we recall some more or less general results that are needed in our proofs. The fourth section contains new ingredients (in terms of dimension) that play an important role in our proofs of the main results in the last section.