双程放大技术在光纤放大器中的应用

双程放大技术是一种高效率、低成本的实用化放大技术。本文介绍了双程放大技术的优点及在各种放大器中的应用。     

阀控式铅酸蓄电池的维护

对阀控式铅酸式蓄电池的维护工作进行了初步探讨。     

PPT光纤波片耦合模方程的解析解

理论分析了PPT光纤波片耦合模方程，得出了一定条件下的解析解，将该解析解和渐进近似结果进行了比较，它们在实际应用的PPT光纤波片中具有很好的一致性。     

具有复合埋层的新型SIMON材料的制备

采用氮氧共注入方法制备了新型的 SIMON(separation by implanted oxygen and nitrogen) SOI材料 .采用不同的制备方法分别制作出样品并进行了结构测试和分析 ,发现 SIMON材料的结构和质量对注入条件和退火工艺非常敏感 .并对各种氮氧复合注入技术做了分析和比较 ,发现氮氧分次注入可以得到更好的结构和性能     

Modification to the Fringe Component of Diffraction Coefficient in TD-EEC Method

A modified formulation for fringe component of diffraction coefficient is implemented to TD-EEC method. An example of diffraction by perfectly conducting plate is used to illustrate our scheme. Comparing with the FDTD results we observe that the improved expression for fringe component is more accurate than that of Michaeli's formulation. This high frequency time domain technique is available for treating the bistatic scattering problems for millimeter waves.     

ON SOME INTERPRETATIONS OF CLASSICAL LOGIC

In distinction from the well-known double-negation embeddings of the classical logic we consider some variants of single-negation embeddings and describe some classes of superintuitionistic first-order predicate logics in which the classical first-order calculus is interpretable in such a way. Also we find the minimal extensions of Heyting's logic in which the classical predicate logic can be embedded by means of these translations.     

Operator Matrix Forms of Positive Operators

If a 3-tuple (A:H1→H1,B:H2→H1,C:H2→H2）of operators on Hibert spaces is given,we proved that the operator ～↑A:=(↑A ↓B^*↑B ↓C) on H=H1 H2 is ≥0 is and only if A≥0,R(B)∪→R（A^1/2) and C≥B^* A^ b,where A^ is the generalized inverse of A.In general,A^ is a closed operator,but since R(B)∪→R(A^1/2,B^* A^ B is bounded yet.     

与单形外接球心有关的一个不等式

若n维单形A＝A1A2…An r的外接球心O位于其内部，单形A与单形Ai＝A1A2…Ai-1OAi 1…An 1的外接球半径分别为R与Ri(i=1,2,…,n 1），本文证明了：n 1↑П↑i=1Ri≥(nR/2)^n 1，而等号成立的充分必要条件为单形A正则。     

Crossover from BCS-superconductivity to Bose-condensation

Starting from a model of free Fermions in two dimensions with an arbitrary strong effective interaction, we derive a Ginzburg-Landau theory describing the crossover from BCS-superconductivity to Bose-condensation. We find a smooth crossover from the standard BCS-limit to a Gross-Pitaevski type equation for the order parameter in a Bose superfluid. The mean field transition temperature exhibits a maximum at a coupling strength, where the behaviour crosses over from BCS to Bose like with corresponding values of 2 Δ₀/T_c ≈ 5 which are characteristic for high T_c superconductors.     

临床试验(Ⅱ)

在本文的第Ⅰ部份，涉及了临床试验的内涵、研究中的偏性、困难与临床试验设计的进展．第Ⅱ部份主要涉及分析中的一些重要问题，其中包括：５，生存质量的测定；６，病人的依从性； ７， Ｍｅｔａ分析．