一种改进的旋转矢量姿态算法

应用陀螺当前迭代周期内及前2个迭代周期内的角增量输出，并根据在当前迭代周期内对陀螺仪采样的次数，提出了3个新的航姿算法，分析了此算法在典型圆锥运动输入下的漂移误差．与传统的旋转矢量法比较，新的算法比Miller’s算法精度高3—4个数量级；对于单子样，新算法比Y．F．Jiang算法精度高约3个数量级，对于双子样、三子样，新算法比Y．F．Jiang算法精度高20—30倍，为改进旋转矢量算法提供了一种新的思路．     

多孔陶粒结晶床除磷试验研究

实验以多孔陶粒为载体，在一定条件下，利用非均相及二次成核作用在陶粒表面沉积一层羟基磷酸钙晶体，从而培养出初级晶种．实验将粒径为1．25mm多孔陶粒与石英砂相对比，结果表明采用多孔陶粒作载体形成结晶体效果较好．用该晶种的连续流固定床除磷，获得令人满意的效果．当原水含磷质量浓度在2～5mg/L范围内时，空床线速不大于2．5m/h，水力停留时间不小千12min时, 脱磷固定床除磷率较高且稳定，磷去除率可达90％以上．     

A complete sequence and comparative analysis of a SARS-associated virus(Isolate BJ01)

Severe Acute Respiratory Syndrome (SARS) is a newly identified infectious disease[1—5]. The global outbreak of SARS has been threatening the health of people worldwide and has killed 353 people and infected more than 5462 in 27 countries, as reported by WHO on April 29, 2003 (http://www.who.int/csr/sarscountry/en). Although it has been recognized that a variant of virus from the family of coronavirus might be the candidate pathogen of SARS[1—5], its identity as the unique pathogen sti…     

CO2泡沫压裂液两相流流动特性的试验研究

通过大型高参数泡沫压裂液试验回路首次详细研究了实际压裂条件下CO2泡沫压裂液的流变特性,得出了实际压裂条件下CO2泡沫压裂液流变参数的计算关联式,从而为低渗油气藏泡沫压裂技术的有效实施提供了试验依据.研究表明:在实际施工条件下,CO2泡沫压裂液具有剪切稀化性质,可用幂律模型来描述;其有效粘度随剪切速率、温度的增高而减小,随压力、泡沫质量的增大而增大;相对而言,温度和泡沫质量对流变参数的影响比压力的影响明显,在该试验范围内,温度和泡沫质量对流变参数的影响呈指数规律变化.     

西部人力资源开发问题研究

人力资源开发是西部大开发的客观要求 ,是促进西部地区产业结构调整的关键环节 ,是解决西部地区诸多社会问题的重要途径。只有以观念更新为前提 ,以优化环境为基础 ,以教育优先为关键 ,以政府作用为保障 ,才能有效地解决西部地区人力资源开发方面存在的诸多问题 ,保证西部大开发战略的顺利实施。     

Dynamical framework with blocking topography coordinates for atmospheric GCM and its validation

The dynamical framework with Blocking Topography Coordinates (hereafter, BTC), which is suited to handle the steep topography for the atmospheric general circulation models, is presented in this paper, together with its validation results. The integral properties of both the differential and finite-difference equations for the BTC dynamical core are: gross mass conservation, quadratic conservation for advection terms, Coriolis force does not change the kinetic energy, conservation of total available energy. The improved nonlinear iteration scheme is utilized for the time-integration. The energy conservation for BTC dynamical core is validated by using the integration results from 9-layer and 21-layer version respectively. Comparison results show that, the changes of the kinetic energy and total available potential energy during the integration are quite close for both the BTC dynamical framework and the dynamical framework of IAP 9-level and IAP 21-level AGCM, and this may suggest that the BTC dynamical core can be used for long-term integration with good computational stability. Furthermore, the BTC dynamical core has the advantage over the terrain following (sigma) coordinates in its better representation of the influence of the large-scale topography on the atmospheric general circulation. Finally, the correctness and reasonableness of the BTC dynamical core has been further proved by the numerical simulation of the topography influence on the quasi-stationary planetary wave with 21-layer version of BTC dynamical framework.     

New geological evidence of crustal thickening in the Gangdese block prior to the Indo-Asian collision

Recent mapping in the Gangdese block has revealed many leucogranites that are similar to those in the High Himalaya. These leucogranites formed at ～140 Ma as indicated by monazite Th-Pb ion-microprobe dating and cooled at ～130 Ma as indicated by muscovite ^40Ar/^39Ar dating. In conjunction with previous structural and paleogeographic studies, the new data indicate that the Gangdese block underwent crustal thickening and associated exhumation during ～140—130 Ma. In this regard, the southern margin of Eurasia continent was comparable to the modern South American Altiplano-Puna plateau, the prime example of active ocean-continent subduction and associated thickened crust. Specifically, the early stages of crustal thickening and uplifting of the Gangdese block may result from subduction of the Neo-Tethyan Ocean. If the Tibetan Plateau would form by accretion of a series of blocks with thickened crust, an elevated topographic plateau similar to the Altiplano-Puna plateau had formed before collision between the Indian and Eurasian plates. Then the Tibetan Plateau would have quickly thickened, uplifted, and begun to extend soon after onset of the collision. Thus, the deformational mechanism of the Tibetan Plateau is not distributed shortening, but rather concentrating deformation within regions of thin crust between the accreted blocks.     

Apache在校园网络中的应用研究

Apache在Internet中的WWW服务器领域，占有无可争议的领先地位．讨论了Apache服务器的实现原理，介绍了Apache的安装和配置过程．并结合实例就Apache在校园网络中的一些常见应用进行了分析，包括为用户提供个人主页服务和虚拟主机的服务等。     

极值风速拟合优化策略

在桥梁设计规范中假定风速随机过程为平稳过程 ,风速母体服从指数型分布并以极值Ⅰ型拟合风速极值渐近分布 .然而实际上风速并不严格地满足平稳过程假设 ,且由于样本数据的来源不同和极值分布参数估计方法各异 ,对风速母体分布及样本极值渐近分布拟合方法的结论不尽相同 .针对上述问题 ,通过蒙特卡罗数值模拟技术研究了多种风速母体分布下具有普遍适用性的极值风速拟合策略 .并以上海地区龙华、川沙气象站极值风速估算为例 ,阐明了该方法的实用性和合理性     

改变水分子簇的结构及诱发的生物效应研究

概述了水分子簇理论研究的基本状况,以及改变水分子团簇结构的4种方法,包括外加磁场、外加电场、激光辐射以及直接加热法;最后简要介绍了改变水分子团簇结构所诱发的生物效应.