叶轮机械设计自变数在内外环壁面上的限制条件及轴流式叶轮机械S1流面的翘曲

本文利用中心流面法的概念,指出叶轮机械的设计白变数在内、外环壁面上应有附加的限制条件,并导得其具体简明方程。同时,还定性地分析了S₁流面的翘曲情况。     

超导临界温度理论(Ⅰ)

本文求出了Eliashberg方程在T=T_c时的解,得到了下面的临界温度级数表示式: 其中α₀(μ^*),α₁(μ^*)等系数是μ^*的函数.此式表明,T_c不仅依赖于λ,〈ω²〉和μ^*,而且依赖于有效声子谱α²F(ω)的各级矩〈ω²n〉.这是区别于前人的T_c公式最重要的一点。这说明像McMillan以及Allen和Dynes的T_c公式不仅是近似的,而主要是他们没有能正确地概括出α²F(ω)对T_c的影响.     

Preparation and properties of the system CoPxS2−x

Lattice parameters were determined for members of the system CoP_xS_2?x (0 ≤ x ≥ 1). A cubic region was observed for 0 ≤ x ≤ 0·5 and a tetragonal region for 0·5 < x ≤ 1. Magnetization and susceptibility measurements were made on the sample CoP_xS_2?x (0 ≤ x ≤ 0·5) from 4·2 to 500°K and to 9·5 kOe. The ferromagnetic Curie temperature decreased almost linearly with composition from a value of 122(1)°K for x = 0 to 23(1)°K at x = 0·3. The saturation magnetization passed through a maximum at 41·5(2) e.m.u./g at x = 0·05, increasing from 40·0(2) e.m.u./g for x = 0, and then decreased to below 15 e.m.u./g for x = 0·3. The paramagnetic data gave a P²_eff/CO²⁺ that increased linearly with phosphorus substitution from 4·4(2)μ_B at x = 0 to 5·5(2)μ_B² at x = 0·5. The Weiss constant decreased almost linearly from 150(3)°K for x = 0 to 85(2)°K for x = 0·3. The magnetic properties of this system are compared with those of the system CoAs_xS_2?x and CoSe_xS_2?x. Changes, with composition, in the Curie and Weiss temperatures are almost identical in the three systems for x ≤ 0·25. As with CoAs_xS_2?x the ferromagnetic moment reaches a maximum at x = 0·05 and then decreases with increasing x, although the magnetic interactions remain ferromagnetic for all x ≤ 0·5.     

Proper holomorphic embeddings of finitely and some infinitely connected subsets of into

We show that any finitely connected domain can be properly embedded into . For some sequences can also be properly embedded into .     

A long ℂ<Superscript>2</Superscript> which is not Stein

We construct a 2-dimensional complex manifold X which is the increasing union of proper subdomains that are biholomorphic to ℂ², but X is not Stein.     

使用色散可调啁啾光纤光栅在常规单模光纤中实现超过100km,10Gb/s的转输 *

报道了用简单的应力方法使均匀光栅成为线性啁啾光纤光栅的技术 ,并推导出了相应理论 ,发现最大色散补偿带宽与色散的乘积近似为常数 .在常规单模光纤G652,10Gb/s系统中实现超过100km的色散补偿 .     

Embedding some Riemann surfaces into $${\mathbb {C}^2}$$ with interpolation

We prove that several types of open Riemann surfaces, including the finitely connected planar domains, embed properly into such that the values on any given discrete sequence can be arbitrarily prescribed. Kutzschebauch supported by Schweizerische Nationalfonds grant 200021-107477/1.