表面凹腔中气泡核的稳定性分析

系统地分析了气泡核在表面凹腔内的生长和收缩过程，通过对气泡核平衡机理的探讨，获得了修正的稳定性判据，进而研究沸腾起始及空腔钝化的条件．首次讨论了气泡核稳定性曲线的滞后效应，并建立了一种定量分析模式，以分析气泡核的稳定性行为．     

灰色系统建模方法的研究

提出了估计ＧＭ（１，１）模型参数的新方法。并给出了ＧＭ（１，１）模型的显著性检验的方法。实例分析表明，新方法提高了预测模型的精度     

余有限语言的不动点特性研究

从映射的不动点方面研究了余有限语言的特性。     

Half-metallic graphene nanoribbons

Electrical current can be completely spin polarized in a class of materials known as half-metals, as a result of the coexistence of metallic nature for electrons with one spin orientation and insulating nature for electrons with the other. Such asymmetric electronic states for the different spins have been predicted for some ferromagnetic metals--for example, the Heusler compounds--and were first observed in a manganese perovskite. In view of the potential for use of this property in realizing spin-based electronics, substantial efforts have been made to search for half-metallic materials. However, organic materials have hardly been investigated in this context even though carbon-based nanostructures hold significant promise for future electronic devices. Here we predict half-metallicity in nanometre-scale graphene ribbons by using first-principles calculations. We show that this phenomenon is realizable if in-plane homogeneous electric fields are applied across the zigzag-shaped edges of the graphene nanoribbons, and that their magnetic properties can be controlled by the external electric fields. The results are not only of scientific interest in the interplay between electric fields and electronic spin degree of freedom in solids but may also open a new path to explore spintronics at the nanometre scale, based on graphene.     

一种镍基单晶高温合金的反相热机械疲劳行为

采用扫描电镜、透射电镜等方法研究了一种镍基单晶高温合金在600~900℃的反相位热机械疲劳行为,旨在探讨单晶合金的热疲劳变形及断裂机制,丰富单晶合金热机械疲劳理论。试验结果表明：当应变幅由0.6%增大至0.9%时,热机械疲劳寿命下降,塑性应变量和应力范围增大。合金的循环应力响应曲线在低温半周表现为循环硬化行为,而在高温半周则表现为循环软化行为。合金主要的变形特征是局部区域滑移带的运动。热机械疲劳裂纹起始于试样表面应力集中处,并沿着滑移带在{111}面向合金内部扩展,拉应力对合金的断裂起到了主导作用。     

可控源音频大地电磁测深法在玉蒙铁路秀山隧道中的应用效果分析

玉溪至蒙自铁路秀山隧道地质条件复杂,全隧采用可控源音频大地电磁测深法(CSAMT)对隧道地层岩性、地质构造、岩溶特征、地下水特征、含煤地层的分布等地质情况进行勘察,经施工对比分析,发现CSAMT法能较准确的解译隧道区发育的断层带、富水带等异常带,对设计和指导施工取到了很好的作用.     

茂丰(6%抗坏血酸水剂)对辣椒增产效果研究

研究茂丰对辣椒的增产效果、结果表明绿色新农药茂丰6％抗坏血酸水剂1500～2000倍溶液600～750kg／hm^3,茎叶喷雾辣椒2—3次,改善品质,可增产10～30％,是辣椒“优质生产”理想的药剂。     

图论中的同谱问题

本文讨论了同谱研究中的两个重要问题,即如何判定同谱图和怎样构造同谱图的问题。研究了同谱点、无约束点、等价点和桥的性质,利用这些性质可由顶点数较少的每图造出无数个同谱图。叙述了Heilbronner定理、图形收缩定理在识别同谱中的应用。对构造同谱图的扩展方法,也用少数例子加以说明。     

羽绒制品服用性能研究方法与结果分析

本文探讨了天然羽绒集合体的有关性能。在研究中,采用先进的电子式压缩弹性仪和热传递测定仪,测定集合体在不同含绒率、填充量条件下与压缩性能、热传递性能间关系,为合理选择含绒率和填充量提供依据。     

在σ＝1附近ξ（s）零点密度的估计

本文利用Ｈａｌａ＇ｓｚ方法、指数对、以及高次均位估计得到了关于ξ（ｓ）的零点密度在σ＝１附近的新上界。