Mg2SiO4-SiC复相材料的常压烧结及性能研究

在1 500～1 600℃氢气气氛下常压保温1 h制备了Mg2SiO4-SiC复相材料,研究了烧结助剂[Al2O3+Y2O3](r(Al2O3:Y2O3)=5:3)添加量对该复相材料烧结性能的影响.结果表明:Mg2SiO4-SiC复相材料的相组成为Mg2SiO4,6H-SiC、Y3Al5O12,最佳烧结温度为1 550...     

Spaces co-absolute with βN-N

We give a characterization of co-absolutes of βN-N analogous to Parovi?enko's characterization of homeomorphs of βN-N. We show that this characterization is in general independent of the usual axioms of set theory, but in the case of the ?ech-Stone remainder of the discrete space of cardinality ?₁ it is absolute.     

Transformation of three-dimensional regions onto rectangular regions by elliptic systems

Summary A transformation method is developed which may be used to solve various types of boundary value problems on three-dimensional regions with an arbitrary boundary. The implementation of the method is illustrated in the solution of a potential flow problem. All computations are performed on a cubic mesh in a rectangular region.This report was prepared as a result of work performed under NASA Contract No. NAS1-14101 while the first author was in residence at ICASE, NASA Langley Research Center, Hampton, VA 23665, USA     

S3C2410X的I2C控制器及其应用开发

本文首先分别介绍了S3C2410XI~2C总线控制器、AT24C04芯片的特点、I~2C总线的特点,然后以S3C2410X和AT24C04之间I~2C总线通信为例,说明了S3C2410X的I~2C总线嵌入式的开发过程和方法。     

Powers of roots in linear spaces

Suppose K is a field, αn∈K^∗, and n is the least natural number with this property. We study the question on how many powers αj, 0?j<n, lie in a given K-linear space.     

On metrizable non-Archimedean LF-spaces

It is known that no non-Archimedean LB-space (and no strict non-Archimedean LF-space) is metrizable. We show that there exist many metrizable (or even normable) non-Archimedean LF-spaces. We prove that every non-normable polar non-Archimedean Fréchet space (and every non-Archimedean Banach space with an infinite basis (x_α)) contains a dense subspace which is an LF-space.     

On the Napoleon-Torricelli configuration in Affine Cayley-Klein planes

There are three affine Cayley-Klein planes (see [5]), namely, the Euclidean plane, the isotropic (Galilean) plane, and the pseudo-Euclidean (Minkow-skian or Lorentzian) plane. We extend the generalization of the well-known Napoleon theorem related to similar triangles erected on the sides of an arbitrary triangle in the Euclidean plane to all affine Cayley-Klein planes. Using the Ω_k-and anti-Ω_k-equilateral triangles introduced in [28], we construct the Napoleon and the Torricelli triangle of an arbitrary triangle in any affine Cayley-Klein plane. Some interesting geometric properties of these triangles are derived. The author is partially supported by grant VU-MI-204/2006.     

Eigenparameter dependent discrete Dirac equations with spectral singularities

Let us consider the Boundary Value Problem (BVP) for the discrete Dirac Equations

(0.1)     

Pairs of quadratic forms over a quadratic field extension

Let F be a field of characteristic distinct from 2, $L=F(\sqrt{d})$ a quadratic field extension. Let further f and g be quadratic forms over L considered as polynomials in n variables, $M_f$, $M_g$ their matrices. We say that the pair $(f,g)$ is a k-pair if there exist $S\in G{L}_n(L)$ such that all the entries of the $k\times k$ upper-left corner of the matrices $S{M}_f{S}^t$ and $S{M}_g{S}^t$ are in F. We give certain criteria to determine whether a given pair $(f,g)$ is a k-pair. We consider the transfer ${\mathrm{cor}}_{L(t)/F(t)}$ determined by the $F(t)$-linear map $s:L(t)\to F(t)$ with $s(1)=0$, $s(\sqrt{d})=1$, and prove that if $\dim {\mathrm{cor}}_{L(t)/F(t)}{(f+tg)}_{an}\le 2(n?k)$, then $(f,g)$ is a $[\frac{k+1}{2}]$-pair. If, additionally, the form $f+tg$ does not have a totally isotropic subspace of dimension $p+1$ over $L(t)$, we show that $(f,g)$ is a $(k?2p)$-pair. In particular, if the form $f+tg$ is anisotropic, and $\dim {\mathrm{cor}}_{L(t)/F(t)}{(f+tg)}_{an}\le 2(n?k)$, then $(f,g)$ is a k-pair.     

AT056TN04液晶屏驱动控制器设计

由于解析度比模拟屏大,玻璃上的线路会更密,对工艺和背光的成本更高,在对颜色要求不高的工业仪器仪表领域,低成本的模拟彩色液晶屏已成首选。提出一种FPGA技术的彩色液晶驱动控制器的设计方案,使用硬件描述语言完成液晶时序和存储器接口,成功实现对AT056TN04的8种基本颜色的显示,既克服单色液晶模块色彩单调,颜色丰富的数字彩色屏价格责的缺点,又具有显示数据量小、用户操作简单方便的优点。适当调整可以方便应用于其他模拟彩色液晶屏,在工业仪器仪表中具有较好的应用价值。