混合并行计算在海洋水龄谱模拟中的应用研究

在海洋水龄谱数值模拟过程中应用并行计算技术可以显著提高运算效率。将适用于分布式存储环境的消息传递接口(Message Passing Interface,MPI)与适用于共享存储环境的开放式多处理(Open Multi-Processing,OpenMP)两种并行计算技术相结合,提出了一种适用于海洋水龄谱数值模拟的混合并行计算模型。对比了其与传统的纯MPI方式在多核心(Chip Muti-processors)集群上的运算效率,并在此基础上研究了混合模型的系统资源利用情况以进一步了解其扩展能力。实验结果表明,MPI+OpenMP混合并行水龄谱模型具有更高的运算效率,同时系统资源消耗明显低于纯MPI方式。     

长江武汉河段的形成和贯通时间

通过对武汉地区第四纪地质构造，古地理环境的综合研究，论述了长江武汉河段的发育。     

贵阳乌当湄潭早期岩相古地理特征

本文通过对岩石成熟度、粒度分析和沉积构造、生物组合等方面的研究,得出乌当湄谭早期为一浅海陆棚——前滨回流带的完整海退系列的认识。区内沉积构造丰富,岩相标志明显,是一个较好的岩相古地理教学场所。     

Carbonate verse silicate Sr isotope in lake sediments and its response to Little Ice Age

The ^87Sr/^86Sr ratios of silicate (acid-insoluble,AI,) and carbonate (acid-soluble,AS) of the lake sediments from the Daihai Lake ,Inner Mongolia since the last 500 years are measured respectively ,indicationg that chemical weathering of silicate minerals was in an early stage since the Little Ice Age within the Daihai watershed by combination with mineral constitute,Rb/Sr ratio and CaCO3 content in the sediments,During the Little Ice Age maximum,an evident peak in the ^87 Sr/^86Sr ratios of both silicate and carbonate in sediments suggests that a cold climate condition is unfavorable to dissolving radiogenic stontium from silcate minerals ,Meanwhile,the variation of ^87 Sr/^86Sr ratios of silicate and carbonate also reflects a projected warming climate favorable to intensifying chemical weathering after the Little Ice Age ,Consequently,the ^87 Sr/^86Sr ratio of both silicate and carbonate in inland lake sediment can be used as an effective proxy of the past climate in single watershed.     

奶牛头胎产奶量与初产期关系的探讨

本文采用方差分析的理论与方法,对西安市草滩农场奶牛一场1980年到1987年青年母牛的初产期与产奶量进行了分析。结果表明,青年母牛初产期在790天以下与791天以上的第一胎产奶量有较大的差异。     

河南省女学生身体素质不定群的五年追踪

学生身体素质的追踪，通过年龄特点、城乡差别、国内比较及身体素质发展变化规律揭示其各类指标的发展变化特，规律和相互之间的内在联系。对学生身体素质的发展工作、决策和培养人才提供了依据。     

女运动员初潮年龄和月经期主要特征

问卷调查了我国优秀女运动员76名,一般运动员85名,业体校学员136名和330名非运动员的初潮年龄和月经期主要特征。结果表明:同非运动员相比,优秀女运动员的初潮年龄有所推迟,而业体校学员初潮年龄则有所提前。月经不良反应,优秀运动员占51.32％,业体校学员占71.32％,非运动员占51.21％。月经期不良反应与初潮来临的季节有一定的内在联系。提示:初潮年龄和月经期不良反应的症状和程度,可作为选才和医务监督的指标之一。     

中国寒冷地区水力学的近代发展

寒冷地区水力学,亦称冰水力学,属二相流范畴,是一个新兴交叉的边缘学科。冬季,我国北纬30度以北,占全国70％地区的河流会出现不同程度的冰冻,有些河流还经常发生凌洪灾害。近20多年来,我国有关研究人员结合寒冷地区经济建设中存在的问题,积极开展冰水运动规律的研究,取得了许多可喜的成果。由于冰水力学涉及到的学科及研究内容较多,本文仅将我国在国内外处于先进水平的部分研究内容,作了概括性的阐述和介绍。     

Simulation of the climatic effects of natural forcings during the pre-industrial era

The MPM-2,an Earth system model of intermediate complexity,is employed to study the climate sys-tem response to natural forcings during the pre-industrial era (1000-1800 AD),with a special focus on the surface air temperature (SAT) evolution. Solar radiation and volcanism are the primary natural forcings during this period. In the MPM-2,the solar radiation forcing determines the long-term trend of the climate system change,and the volcanic forcing intensifies (weakens) this trend. Ultimately,the combination of solar and volcanic forcings dominates the long-term changes of the climate system. These results are in good agreement with other model data or temperature reconstructions. Natural forcings can well explain the Little Ice Age (LIA) and the Medieval Warm Period (MWP). At the large regional scale,the SAT response to natural forcings is almost coincident with that of the Northern Hemisphere. Based on MPM-2 model results,it is concluded that the global climate gradually became cold during the pre-industrial era. However,MPM-2 model results substantially correlate with recon-structed solar and volcanic forcings. Namely,to some great extent,these results strongly rely on the forcing series data we choose. Therefore,in order to accurately simulate the secular variation of the historical climate,it is very important to reconstruct well the solar radiation change and volcanic forc-ing data are well reconstructed for the past 10000 years,at least for the past 2000 years,in addition to the model improvements. The sensitivity study on the abrupt solar radiation change indicates that the increased solar radiation not only strengthens the nonlinear response of SAT,but intensifies the global hydrological cycle. At the same time,the biosphere is also affected obviously.     

暗物质的自然现象和成因机理探析

暗物质粒子产生于宇宙大爆炸,它是由一个兆子和两个次能子合成的独立兆子系。由这种兆子系在本体贝粒子流循环输入或输出的增益过程中构成的五维弥散态络合物,就是暗物质又称暗物质云。暗物质云具有质量、引力,但与磁和光均不发生反应。它只能存在于物质态的负引力空间(惰性空间,第五维空间),并与所在宇宙单元区按相同轨迹运动。在单元区中,显物质和暗物质所占的比例大体相同,两者之间通过能量辐射、爆炸的形式实现质量互为转换。地球与具有阻光特性的暗物质云团在相互运动中相遇,应是冰河期的成因之一,这会给地球生态带来毁灭性的破坏。暗物质中蕴含着巨大的能量。对暗物质这一自然存在如何避害趋利是科技界应该考虑的问题。