蒙脱石修饰碳糊电极测定氨基酸的研究：Ⅱ.酪氨酸的测定

本文报道蒙脱石修饰碳糊电极测定酪氨酸，在０．００１ｍｏｌ／Ｌ ＫＣｌ－ＨＣｌ（ｐＨ＝２．０）溶液中开路富集，介质交换后微分脉冲阳极溶出伏安法测定，在０．５－２．５μｇ／ｍｌ范围内有线性，检测限为６３ｎｇ／ｍｌ。可避免其他氨基酸，微量元素和常量金属元素的干扰，直接用于氨基酸药物样品的分析，获得了满意的结果，还对酪氨酸在电极上的反应机理进行了探讨。     

Study on the effects of fluorine and oxygen deficiency on YBa2Cu307 byab initio method

The calculations of clusters modeling the fluorine-doping and oxygen deficiency of YBa₂Cu₃0₇ have been performed by the method of all-electronab initio Hartree-Fock with self-consistent crystal field. Results show that in CuO planes electric charge significantly increases, the chemical valence of Cu decreases and the covalent bonding of Cu-O greatly weakens owing to oxygen deficiency, while the effect of F restores the local electronic structure of YBa₂Cu₃O₇. The reported opinion that F occupied the oxygen vacancy in Cu-O chains seems disputable according to the calculated bonding characteristics Project supported by the National Natural Science Foundation of China.     

Ricci Positive Metrics on the Moment-Angle Manifolds

In this paper, the authors consider the problem of which (generalized) moment-angle manifolds admit Ricci positive metrics. For a simple polytope $P$, the authors can cut off one vertex $v$ of $P$ to get another simple polytope $P_{v}$, and prove that if the generalized moment-angle manifold corresponding to $P$ admits a Ricci positive metric, the generalized moment-angle manifold corresponding to $P_{v}$ also admits a Ricci positive metric. For a special class of polytope called Fano polytopes, the authors prove that the moment-angle manifolds corresponding to Fano polytopes admit Ricci positive metrics. Finally some conjectures on this problem are given.     

On Groups with Minimality Condition for Noninvariant Abelian pd-Subgroups

We study properties and the structure of non-Abelian groups with minimality condition for non-invariant Abelian pd-subgroups in the case where they do not satisfy the minimality condition for Abelian pd-subgroups. We prove the solvability of these groups and establish relations with non-Abelian groups in which all infinite Abelian pd-subgroups are invariant.__________Translated from Ukrains’kyi Matematychnyi Zhurnal, Vol. 57, No. 2, pp. 265–270, February, 2005.     

2-Groups with normal noncyclic subgroups

We study nearly-hamiltonian 2-groups (¯H₂-groups). A nonabelian 2-group having at least one proper noncyclic subgroup is called an ¯H₂-group if all noncyclic subgroups are normal.Translated from Matematicheskie Zametki, Vol. 4, No. 1, pp. 75–84, July, 1968.The author expresses his deep gratitude towards Professor S. N. Chernikov for guidance while writing this paper.     

A Note on a Generalisation of Eneström–Kakeya Theorem for Quaternionic Polynomials

Mediterranean Journal of Mathematics - In this paper, we introduce the k-generalized Stockwell transform on $${\mathbb {R}}$$ . We investigate for this transform the main theorems of Harmonic...     

Type II hybrid structures of TiO2 nanorods conjugated with CdS quantum dots: assembly and optical properties

We developed a novel method to assemble TiO₂ nanorods conjugated with CdS quantum dots by L-cysteine molecular linker for type II semiconducting hybrid structure. The XRD patterns indicate that the CdS quantum dots perform the cubic phase structure, and TEM images show that CdS quantum dots are well dispersed on the surfaces of anatase TiO₂ nanorods with little agglomeration. The UV-vis absorption spectra reveal the bandgap alignment in type II configuration between CdS QDs and TiO₂ nanorods.