逆向阴燃问题一维定态解的数学性质

利用数学分析的方法研究了非绝热逆向阴燃波的一维定常解的数学性质，并对富燃情况下逆向阴燃的定常解进行数值模拟。理论推导与数值模拟的结果表明：温度、固体质量浓度和氧气质量浓度在x趋于正无穷时趋于定常数，且温度在无穷远处的极限为环境温度θ₀，而固体质量浓度和氧气质量浓度在无穷远处的极限的乘积为零。     

极限编程初探

简单介绍了极限编程（XP）软件方法，讨论了使用极限编程的益处，进而结合自身项目经验和对极限编程的实践提出了适合当前软件业的9条实施建议，以期对提高软件生产质量和效率能有所裨益。     

应用∑△pi／di确定有效细粒群的最佳配比

为提高填充料浆质量及指导料浆管输设计，论证了级配特征参数∑△pi/di与极限体积分数Cvm的相关性，得出了粗、细两种充填物料混合后体积分数达到最大值时的级配最佳的结论，并给出了求解极限体积分数的方程组。     

关于二重极限性质和计算的若干问题

由于坐标平面上的动点趋于定点的方式有无穷多种，因此，判断二重极限是否存在，以及如何求出二重极限一直都是高等数学中的重点与难点，也是考研数学中的热点。为了让学生更好地掌握二重极限，类比一元函数的极限，证明了二重极限的相关性质，介绍了计算二重极限和判断二重极限是否存在的各种方法，并通过相应的例子加以说明。     

一类有界E_3~1系统的极限环

研究只有一个有限远奇点的有界Ｅ３１系统在２个等价条件下的极限环问题，得到了系统不 存在极限环，恰有一个极限环和至少二个极限环的条件，并分析了极限环的变化情况。     

LF集合列的极限集

以LF集的分解定理及经典集合列的极限为基础，建立了LF集合列的极限集的概念，讨论了极限的运算法则，并进一步证明了R型LF集的Fuzzy运算的极限运算性质．     

关于光子有无静质量的问题

本学光子有无静质量问题，基于有关超光速理论和光速极限，论证了光子的静质量存在的可能性。     

关于极限概念的发展

将函数的极限概念进行了推广，引入了定向函数的极限定义．并对极限进一步发展成为一般定义———网格的极限作了简要介绍．     

套管弯曲强度与极限转角研究

以弹塑性理论和极限分析理论为基础，对弯曲井段内套管的抗弯强度进行了研究，给出了套管强度和极限转角的计算公式．分析表明，套管的Ⅰ级极限转角βⅠ可作为套管选材的依据，并由此提出了套管设计的极限转角准则：Ｙｍａｘ＜βⅠ．结合长庆油田塞平—１水平井固井工艺设计，对多种套管的极限转角进行了实例计算，并采用极限转角准则，对其弯曲井段内的技术套管和油层套管进行了选材，为套管串结构设计提供了理论依据．还对所选套管进行了弯曲强度校核     

数列及函数极限的几种特殊求法

高等数学乃至分析系统各门课就是用极限方法研究函数，极限的概念在整个微积分部分的学习中起着承上启下的作用，既可加深对函数基本概念的理解，也可为连续函数打下基础。本文对求数列与函数极限的若干方法加以归纳、总结，以帮助读者更容易理解极限的概念并熟练掌握求极限的方法     

Chandrasekhar H-方程组的可积正解

把ＣｈａｎｄｒａｓｅｋｈａｒＨ方程推广到ＣｈａｎｄｒａｓｅｋｈａｒＨ方程组情形，得到了方程组适定的条件，并在此基础上研究了具有可积正解的必要充分条件和可积正解的稳定性，此外讨论了歧点．     

Chandrasekhar方程之拉氏形式,Neother流及其反散射方程

文中给出了Chandrasckhar方程的拉氏形式,由此导出了三种类型的Neother守恒流并将此方程化为手征形式,进而给出其反散射方程。     

量子统计理论对白矮星的分析

用量子统计理论分析了白矮星的组成、性质以及白矮星存在的原因,只有白矮星上电子气体的简并压与自引力达到平衡时,白矮星才能存在,并求出钱德拉塞卡极限质量、密度和极限半径。     

Two populations of X-ray pulsars produced by two types of supernova

Two types of supernova are thought to produce the overwhelming majority of neutron stars in the Universe. The first type, iron-core-collapse supernovae, occurs when a high-mass star develops a degenerate iron core that exceeds the Chandrasekhar limit. The second type, electron-capture supernovae, is associated with the collapse of a lower-mass oxygen-neon-magnesium core as it loses pressure support owing to the sudden capture of electrons by neon and/or magnesium nuclei. It has hitherto been impossible to identify the two distinct families of neutron stars produced in these formation channels. Here we report that a large, well-known class of neutron-star-hosting X-ray pulsars is actually composed of two distinct subpopulations with different characteristic spin periods, orbital periods and orbital eccentricities. This class, the Be/X-ray binaries, contains neutron stars that accrete material from a more massive companion star. The two subpopulations are most probably associated with the two distinct types of neutron-star-forming supernova, with electron-capture supernovae preferentially producing systems with short spin periods, short orbital periods and low eccentricities. Intriguingly, the split between the two subpopulations is clearest in the distribution of the logarithm of spin period, a result that had not been predicted and which still remains to be explained.     

The type Ia supernova SNLS-03D3bb from a super-Chandrasekhar-mass white dwarf star

The accelerating expansion of the Universe, and the need for dark energy, were inferred from observations of type Ia supernovae. There is a consensus that type Ia supernovae are thermonuclear explosions that destroy carbon-oxygen white dwarf stars that have accreted matter from a companion star, although the nature of this companion remains uncertain. These supernovae are thought to be reliable distance indicators because they have a standard amount of fuel and a uniform trigger: they are predicted to explode when the mass of the white dwarf nears the Chandrasekhar mass of 1.4 solar masses (M(o)). Here we show that the high-redshift supernova SNLS-03D3bb has an exceptionally high luminosity and low kinetic energy that both imply a super-Chandrasekhar-mass progenitor. Super-Chandrasekhar-mass supernovae should occur preferentially in a young stellar population, so this may provide an explanation for the observed trend that overluminous type Ia supernovae occur only in 'young' environments. As this supernova does not obey the relations that allow type Ia supernovae to be calibrated as standard candles, and as no counterparts have been found at low redshift, future cosmology studies will have to consider possible contamination from such events.     

Discovery of the progenitor of the type Ia supernova 2007on

Type Ia supernovae are exploding stars that are used to measure the accelerated expansion of the Universe and are responsible for most of the iron ever produced. Although there is general agreement that the exploding star is a white dwarf in a binary system, the exact configuration and trigger of the explosion is unclear, which could hamper their use for precision cosmology. Two families of progenitor models have been proposed. In the first, a white dwarf accretes material from a companion until it exceeds the Chandrasekhar mass, collapses and explodes. Alternatively, two white dwarfs merge, again causing catastrophic collapse and an explosion. It has hitherto been impossible to determine if either model is correct. Here we report the discovery of an object in pre-supernova archival X-ray images at the position of the recent type Ia supernova (2007on) in the elliptical galaxy NGC 1404. Deep optical images (also archival) show no sign of this object. From this we conclude that the X-ray source is the progenitor of the supernova, which favours the accretion model for this supernova, although the host galaxy is older (6-9 Gyr) than the age at which the explosions are predicted in the accreting models.     

组限新探

阐明了组距式分组中的组限合义,给出了较为完善的组限定义,并结合集合与区间的概念论述了组限的正确表达方式:连续型变量应采用重叠式组限,离散型变量应采用不重叠式组限。重叠式组限中存在实际组限和名义组限的问题,对此,本文提出了确定各组名义值(名义组限)的原则。     

高温热管翅传热极限分析

对高温热管翅的传热极限进行分析,结果表明高温热管翅主要受到冷冻起动极限、声速传热极限和携带传热极限的制约,不受连续流动极限、粘性传热极限、毛细传热极限、沸腾传热极限的限制。     

论我国对著作人身权的限制

我国著作权限制制度主要是对针对著作财产权利进行限制,法律中并未直接规定对著作人身权的限制。这并不意味着在我国不存在着对著作人身权的限制,实际上在著作财产权的限制中已隐含着对著作人身权的限制。结合我国著作权财产权限制条款设置的具体目的分析其中包含的对著作人身权的限制,主要包括了对署名权、保护作品完整权、修改作品的权利的限制。     

高速公路车速限制实施方法研究

通过对分车型与分车道车速限制的优缺点及适用性进行综合分析,应用关于最高车速限制基准值、车道数及车道位置修正系数及最低车速限制方法的研究成果,给出了不同车道高速公路的分车型与分车道车速限制方法与建议值,提出了车速限制区间和车速限制连续性指数的概念,以车速限制连续性指数小于0.85作为车速限制区间的划分依据,给出了高速公路车速限制区间划分结果。