简谐势阱中弱相互作用玻色气体的临界温度及基态粒子占据率

应用局域密度近似法（LDA）对简谐势约束下的非理想玻色气体发生玻色－爱因斯坦凝聚（BEC）时的临界温度作出计算，进而讨论了弱相互作用对临界温度及基态粒子占据率的影响。这些研究将有助于对BEC这种新物态性质的进一步了解。     

事件空间中高阶单面非完整系统的守恒律

研究了事件空间中高阶单面非完整系统的守恒律。首先给出事件空间中的万有d‘Alembert原理和非等参数变分；其次基于该原理在无限小群变换下的不变性，得到事件空间中高阶单面非完整系统的守恒律；最后举例说明结果的应用。     

具有偶型位势的二阶系统周期解的存在性定理

用极小作用原理得到了具有偶型位势的非自治二阶系统周期解的一存在性定理。     

半无限长柱体出水数值模拟

自由面流动在工程问题中经常遇到。为研究半无限长柱体出水过程中 ,不同的 We和 Fr对自由面的影响 ,基于VOF(volume of fluid)的基本思想 ,使用改进的 Youngs算法实现体积分数的近似和推进 ,对问题进行了数值研究 ,分别得到了该问题的 We和 Fr临界值 :当 We大于临界值时 ,可以忽略表面张力的作用 ;当 Fr大于临界值时 ,可以忽略重力的影响     

Dieterici实际气体热力学性质的计算与分析

本对Dieterici实际气体的热力学性质做了比较细致的分析，首先计算Dieterici实际气体的两个主要热力学函数，内能和熵，导出了Cp-Cv和[зU/зV]T的数学表示式，再依据对应态原理得到了Dieterici实际气体的临界压缩因数Zc，综个所述和vdW物态方程，RK物态方程所得结果一起与气体的实验测量值进行了比较和分析，说明了Dieterici物态方程不仅比vdW物态方程更贴近实际气体的行为和热力学性质，而且对于碳氢化合物类物质来说甚至超过了目前在生产实践中应用较多的RK物态方程。     

亚临界锅炉减温水量过大问题的技术改造

某亚临界锅炉在电厂运行中出现了严重的减温水量过大的问题 ,本文借鉴前人的经验 ,通过研究提出技术改造方案 ,并将各方案进行分析和比较 ,同时考察其工程实际应用效果 ,对同类问题具有很大的参考价值     

A broad deglacial δ13C minimum event in planktonic foraminiferal records in the Okinawa Trough

The equatorial Pacific upwelling zone has been suspected of playing an important role in the global atmospheric CO2 changes associated with glacial-interglacial cycles.In order to assess the influencing scope of the surface water deglacial δ13C minimum in the tropical Iow-latitude Pacific,the core DGKS9603, collected from the middle Okinawa Trough, was examined for δ13C records of planktonic foraminifera N. dutertrei and G. ruber. The planktonic foraminiferal δ13C records show a clear decreasing event from 20 to 6 cal. kaBP., which is characterized by long duration of about 14 ka and amplitude shift of 0.4 × 10-3. Its minimum value occurred at 15.7 cai kaBP. The event shows fairly synchrony with the surface water deglacial δ13C minimum identiffed in the tropical Pacific and its marginal seas. Because there is no evidence in planktonic foraminiferal fauna and δ18O records for upwelling and river runoff enhancement,the broad deglacial δ13C minimum event in planktonic foraminiferal records revealed in core DGKS9603 might have been the direct influencing result of the deglacial surface water of the tropical Pacific. The identification for the event in the Okinawa Trough provides new evidence that the water evolution in the tropical low-latitude Pacific plays a key role in large regional, even global carbon cycle.     

Precise timing of the Early Paleozoic metamorphism and thrust deformation in the Eastern Kunlun Orogen

In Dulan County, Qinghai Province NW China, the arc volcanic sequences in the northern side of the Central Fault of the East Kunlun were metamorphosed progressively from upper greenschist facies in the south to epidote-amphibolite facies in the north. High-angle thrust deformation was developed synchronously with the peak metamor-phim and superimposed with later low-angle striking-slip deformation. Zircon U-Pb dating yields a concordant age of(448 ± 4) Ma for the metavolcanics. Syn-kinematic horn-blende and muscovite separated from the high-angle thrusting belt give ⁴⁰Ar-³⁹Ar plateau age of (427 ± 4) Ma and 408 Ma, respectively. These results precisely constrain the timing of the closure of early Paleozoic volcanic basin (Proto-Tethys) over the eastern portion of the East Kunlun Orogen, and the thrust tectonic slice had a cool rate of ca. 9℃/Ma. Keywords: East Kunlun Mountains, metamorphic and deformation event, geochronology.     

矿区土地复垦信息系统中时态数据组织方法

基于GIS建立矿区土地复垦信息系统，对矿区土地资源管理和土地复垦规划决策具有重要意义。沉陷地土地资源信息随着煤炭的开采而不断变化。所以，矿区土地复垦空间数据库是一个时态数据库。分析了采煤沉陷地土地资源动态变化的特点，在前人研究的基础上，综合了基于事件和基于特征时空数据模型的特点，建立了一个基于事件和特征的时空数据模型，并进一步给出其相应的数据组织方法。在此基础上，探讨了基于该模型的时空信息查询与分析方法。该模型可以较好地保持特征实体的完整性，数据冗余较少，适合于在现有的GIS软件中组织时空数据。     

一个半线性椭圆型方程非平凡解的存在性

摘要：研究一个半线性椭圆型偏微分方程，在失去某种紧性条件的情况下，运用没有(PS)条件的山路引理，汪明了此方程的非平凡解的存在性．