15个副省级城市科技创新能力比较研究

创新型城市是现阶段城市发展的目标，评价城市科技创新能力，成为实施这一目标建设的基础。     

夏大豆高产稳产栽培技术要点

<正> 随着育种和生产的发展,要挖掘大豆的增产潜力,迅速提高大面积大豆产量,必须做到“良种良法”一齐抓。下面谈谈我省夏大豆高产稳产栽培技术要点。一、因地制宜选用良种因地制宜选用优良品种是经济有效的增产措施。各大豆产区应根据当地的气候特点和生产条件,选用适宜一年两熟、高产稳产,适应性强、品质好的大豆优良品种。如丰产品种豫豆7号和豫豆8号既耐肥、抗倒,又抗早、耐涝。适合种植于肥水条件好的土壤。     

自主创新 从经济大国向强国转变的依靠

<正>自主创新是走新型工业化道路的保障自主创新在中国已经成为国家的战略,是科学技术的战略基点,是转变经济增长方式的中心环节,这样的高度是前所未有的。以前邓小平同志提出了“科学技术是第一生产力”,     

Adhesion of PBO Fiber in Epoxy Composites

The high mechanical and thermal performance of poly p-phenylene- 2, 6-benzobisoxazole ( PBO ) fiber provides great potential applications as reinforcement fibers for composites. A composite of PBO fiber and epoxy resin has excellent electrical insulation properties, therefore, it is considered to be the best choice for the reinforcement in high magnetic field coils for pulsed magnetic fields up to 100 T.However, poor adhesion between PBO fiber and matrix is found because of the chemically inactive and/or relatively smooth surface of the reinforcement fiber preventing efficient chemical bonding in the interface, which is a challenging issue to improve mechanical properties. Here, we report the surface modification of PBO fibers by ultraviolet (UV)irradiation, O2 and NH3 plasma, as well as acidic treatments. The interfacial adhesion strength values of all the treatments show the similar level as determined for aramid fibers by pull-out tests, a significant impact on fibermatrix-adhesion was not achieved. The surface free energy and roughness are increased for both sized and extracted fibers after plasma treatments together with maleic anhydride grafting. The sized fiber shows marginal improvement in adhesion strength and no change in fiber tensile strength because of the barrier effect of the finish.For the extracted fiber, different surface treatments either show no apparent effect or cause reduction in adhesion strength. Atomic force microscopy (AFM) topography analysis of the fracture surfaces proved adhesive failure at the fiber surface. The fiber surface roughness is increased and more surface flaws are induced, which could result in coarse interface structures when the treated fiber surface has no adequate wetting and functional groups. The adhesion failure is further confirmed by similar adhesion strength and compression shear strength values when the fiber was embedded in various epoxy resins with different temperature behavior. The tensile strength of fiber is sensitive to surface treatment conditions as revealed by a bimodal Weibull statistical distribution analysis. Considerable strength reduction occurred, particularly for cases of acidic and plasma treatments, while UV irradiation shows the better ability to retain fiber strength.     

Glauber相干态和Schrdinger波包

Schrodinger波包是描述一物理系统的态,其波形不随时间变化,它使系统坐标一动量不确定关系始终取极小值。Glauber相干态是湮灭算符的本征态。本文讨论Schrodinger波包与Glauber相干态的不同定义,并证明相干态是一种Schrodinger波包。     

役后铝镁碳砖再生料应用于Al2O3-SiC-C质浇注料

以8～5 mm、5～3 mm、3～1 mm和＜74 μm役后铝镁碳残砖再生料为原料,部分替代同种规格Al2O3-SiC-C质浇注料中的高铝矾土熟料配料量,通过对材料的烧结性及抗钢渣侵蚀性等性能的测试分析,探讨了铝镁碳砖再生料的引入粒度和用量对Al2O3-SiC-C质浇注料性能的影响规律.结果表明,随着铝镁碳砖再生料粒度的减小和用量的增加,Al2O3-SiC-C质浇注料烧后气孔率、常温抗折(耐压)强度和高温抗折强度逐步降低,抗钢渣侵蚀性逐渐变差.在试验用料组成范围内,以引入8～5mm役后铝镁碳残砖再生料的Al2O3-SiC-C质浇注料的综合性能最好.     

一类时滞脉冲微分方程的概周期解

利用锥上不动点定理,研究一类非自治时滞脉冲微分方程的概周期解,给出该系统存在概周期解的一组充分条件.     

三峡文化圈概说

“三峡文化圈”就其形成可以从山水同源、经济同体、民族同根等来考察；从其表里层次，亦可从民俗民风、文学艺术来体现；其表现形式如蚕桑文化、山水文化、巴楚文化、军事文化更是丰富深厚．