活性炭吸附-电感耦合等离子体质谱法测定化探样品中痕量金

采用王水溶样,活性炭动态吸附富集,电感耦合等离子体质谱法测定化探样品中痕量金,优化了样品分解、吸附条件、干扰消除等条件。结果表明,检出限0．13ng／mL,RSD〈4．7％,回收率97．63％～103．35％。该法准确可靠、简便快速,能满足化探样品检测要求。     

DG-Modules vs. Relative Hopf Modules

In this note we show the interlacing between homological algebra and the category of relative Hopf modules. We show that many well-known concepts related with differential graded algebras can be performed as purely Hopf algebraic phenomenons.     

Minimal Non-FO-Groups

A group G is said to be a “minimal non-FO-group” (an MNFO-group) if all its proper subgroups are FO-groups, but G itself is not. The aim of this article is to study the class of MNFO-groups. The structure of MNFO-groups is completely described, both in nonperfect case and perfect case.     

Characters and Equivalence Classes of Central Simple Group Graded Algebras

We introduce an equivalence between central simple strongly G-graded algebras. Such classes are associated in a natural way to absolutely irreducible characters of semisimple G-graded algebras. We study invariants of this equivalence relation, and also the structure of certain representatives of the equivalence classes.     

程度下近似算子与变精度上近似算子的差运算模型

目的是探讨精度与程度的复合,建立并研究新的粗糙集拓展模型.基于程度与精度的逻辑差需求,提出了程度下近似算子与变精度上近似算子的差运算模型,得到了程度下近似算子与变精度上近似算子的差运算的宏观本质、精确描述与基本性质.并用一个医疗实例说明了模型的意义和应用.程度下近似算子与变精度上近似算子的差运算模型,部分的拓展了程度粗糙集模型和经典粗糙集模型.     

Poisson color algebras of arbitrary degree

A Poisson algebra is a Lie algebra endowed with a commutative associative product in such a way that the Lie and associative products are compatible via a Leibniz rule. If we part from a Lie color algebra, instead of a Lie algebra, a graded-commutative associative product and a graded-version Leibniz rule we get a so-called Poisson color algebra (of degree zero). This concept can be extended to any degree, so as to obtain the class of Poisson color algebras of arbitrary degree. This class turns out to be a wide class of algebras containing the ones of Lie color algebras (and so Lie superalgebras and Lie algebras), Poisson algebras, graded Poisson algebras, z-Poisson algebras, Gerstenhaber algebras, and Schouten algebras among other classes of algebras. The present paper is devoted to the study of structure of Poisson color algebras of degree g₀, where g₀ is some element of the grading group G such that g₀ = 0 or 4g₀≠0, and with restrictions neither on the dimension nor the base field, by stating a second Wedderburn-type theorem for this class of algebras.     

Strongly Rickart objects in abelian categories

We introduce and study (dual) strongly relative Rickart objects in abelian categories. We prove general properties, we analyze the behaviour with respect to (co)products, and we study the transfer via functors. We also give applications to Grothendieck categories, (graded) module categories and comodule categories. Our theory of (dual) strongly relative Rickart objects may be employed in order to study strongly relative regular objects and (dual) strongly relative Baer objects in abelian categories.     

Modules with pure resolutions

Let R a standard graded algebra over a field k. In this paper, we give a relation in terms of graded Betti numbers, called the Herzog–Kühl equations, for a pure R-module M to satisfy the condition dim(R)?depth(R) = dim(M)?depth(M). When R is Cohen–Macaulay, we prove an analogous result characterizing all graded Cohen–Macaulay R-modules of finite projective dimension. Finally, as an application, we show that the property of R being Cohen–Macaulay is characterized by the existence of pure Cohen–Macaulay R-modules corresponding to any degree sequence of length at most depth(R).     

热控涂层光学性能退化模型研究

在实验研究成果的基础上,给出了热控涂层在空间辐照作用下的退化模型,接着用渐变折射率的概念对复折射率材料热控涂层的光学性能进行了分析,得到了退化前后热控涂层光学性能变化的表达式,最后对热控涂层光学性能退化模型的应用进行了探讨. 关键词： 热控涂层 渐变折射率 辐照 退化     

渐变阻抗飞片超高速发射数值模拟

 为在轻气炮上实现二级飞片的超高速发射,设计了波阻抗连续变化的渐变阻抗飞片。变阻抗飞片撞击面为镁,底面为钨,中间为镁、铜和钨的掺合材料。建立了变阻抗飞片超高速发射的计算模型,采用分成单元层描述阻抗变化。对变阻抗飞片超高速发射二级飞片过程进行了数值模拟计算,分析了阻抗分布、二级飞片直径和缓冲层厚度对二级飞片速度的影响。结果表明：在优化阻抗分布、二级飞片直径和缓冲层厚度的条件下,二级飞片的最大速度能够达到16 km/s以上。