高等植物的性别表达及其调控——外界因子对植物性别表达的影响

高等植物的性别表达研究是成花生理及发育生理的一个特殊组成部分,是生殖生理学中的最重要问题之一,在理论上、实践上都具有重要意义.由于植物性别表达本身的特点,使高等植物成为研究发育、性别表达及其决定的优良实验系统.     

关于一个算子的收敛性

本文在文[2][3]的基础上,进一步讨论了((?)x)的收敛性问题,得到若f(t)=0(t~(2at~2))(t→∞),并满足在有限区间上有界及一定的连续条件,则有Bn(f,X)→f(x)(n→∞)且给出了一个使Bn(f,x)不存在的函数数类。     

产酸克雷伯氏杆菌（Klebsiella oxytoca）的分离及其特性研究

从小麦根系分离筛选到产酸克雷伯氏杆菌(klebsiella oxytoca)一株用乙炔还原法测定其固氮酶活性为2708.33nmC_2H_4/管/小时,研究了菌株的培养和形态特征,生长和生理生化特性。砂培试验表明,以灭菌草炭吸附的菌剂,对小麦有明显的回接效果,已经大面积应用。     

电渣重熔铸铁渣系的选择

介绍铸铁重熔的一些实验结果,对提出的CaF_250%、CaO30％、AI_2O_310％、MgO_5、SiO_25％五元渣进行了熔点、粘度和电导的测定与讨论。多炉的重熔试验表明,该渣系对铸铁重熔有较好的适应性。     

节能型GTO串级调速装置

节能型GTO串级调速装置是一种新型的整流装置。该装置的功率因数得到很大的改善,它的推广应用将对节能有较重要的意义。 论文讨论了改善功率因数的原理和方法,试验测定了绕线型电机。一般串级调速装置和节能型GTO串级调速装置的功率因数特性曲线。曲线对比能够说明节能型GTO串级调速装置高功率因数的优点。     

Electronic structure of the iron-based superconductor LaOFeP

The recent discovery of superconductivity in the iron oxypnictide family of compounds has generated intense interest. The layered crystal structure with transition-metal ions in planar square-lattice form and the discovery of spin-density-wave order near 130 K (refs 10, 11) seem to hint at a strong similarity with the copper oxide superconductors. An important current issue is the nature of the ground state of the parent compounds. Two distinct classes of theories, distinguished by the underlying band structure, have been put forward: a local-moment antiferromagnetic ground state in the strong-coupling approach, and an itinerant ground state in the weak-coupling approach. The first approach stresses on-site correlations, proximity to a Mott-insulating state and, thus, the resemblance to the high-transition-temperature copper oxides, whereas the second approach emphasizes the itinerant-electron physics and the interplay between the competing ferromagnetic and antiferromagnetic fluctuations. The debate over the two approaches is partly due to the lack of conclusive experimental information on the electronic structures. Here we report angle-resolved photoemission spectroscopy (ARPES) of LaOFeP (superconducting transition temperature, T(c) = 5.9 K), the first-reported iron-based superconductor. Our results favour the itinerant ground state, albeit with band renormalization. In addition, our data reveal important differences between these and copper-based superconductors.     

求非光滑优化全局解的一个改进的填充函数法

本文考虑优化问题min form x∈Ω F(x),其中F为弱半光滑函数.基于非光滑分析理论,构造了一类求解上述问题的新的单参数填充函数,改进了原有结果.最后进行了编程和数值实验,结果表明该方法是可靠的和有效的.     

机载雷达BIT及实现研究

机载雷达BIT是指现代机载雷达系统自动监测内部状态、故障诊断和隔离的功能。本文在结合雷达结构、性能、功能和用户需求的基础上,论述了机载雷达自检系统的组成、实现过程及其故障报告机制。