地面大直径应急救援钻孔成孔工艺设计与分析

地面大直径钻孔可作为井下被困人员的逃生通道,是矿山事故造成人员被困井下时重要的应急救援方案之一。而常规大直径工程孔以泥浆正循环、多级扩孔工艺为主成孔,无法满足救援要求。着眼于大直径孔救援逃生目的,阐明包括精准透巷、优化孔身结构、高效成孔和安全透巷等四项成孔工艺设计原则;以此为指导,针对覆盖层钻进、二开基岩层钻进、下套管及固井具体施工情况,分析了全套管钻进、导向孔下导管钻进及集束式潜孔锤扩孔钻进、浮力法下套管及内插法固井等技术;借用巷道围岩松动圈及塑性区成熟理论,视透巷钻进所破坏的塑性区岩体为潜在垮落体,进行顶板稳定校核,提出了安全透巷距离及位置等关键参数设计选取方法,为地面大直径应急救援钻孔施工提供技术支持。     

半参数模型统计诊断与粗差检验

This paper systematically studies the statistical diagnosis and hypothesis testing for the semiparametric linear regression model according to the theories and methods of the statistical diagnosis and hypothesis testing for parametric regression model.Several diagnostic measures and the methods for gross error testing are derived.Especially,the global and local influence analysis of the gross error on the parameter X and the nonparameter s are discussed in detail;at the same time,the paper proves that the d...     

Recent progress in the theory and application of symplectic integrators

In this paper various aspect of symplectic integrators are reviewed. Symplectic integrators are numerical integration methods for Hamiltonian systems which are designed to conserve the symplectic structure exactly as the original flow. There are explicit symplectic schemes for systems of the formH=T(p)+V(q), and implicit schemes for general Hamiltonian systems. As a general property, symplectic integrators conserve the energy quite well and therefore an artificial damping (excitation) caused by the accumulation of the local truncation error cannot occur. Symplectic integrators have been applied to the Kepler problem, the motion of minor bodies in the solar system and the long-term evolution of outer planets.     

面包酵母悬浮液中添加脂溶性维生素对褶皱臂尾轮虫增殖率的影响

采用批量培育法研究了在面包酵母悬浮液中添加不同浓度的脂溶性维生素对褶皱臂尾轮虫（Ｂｒａｃｂｉｏｎｕｓｐｌｉｃａｔｉｌｉｓ）增殖率的影响。结果表明：面包酵母对褶皱臂尾轮虫的生长繁殖是有营养缺陷的。在面包酵母悬浮液中．当添加维生素Ａ为０．０２～５．００μｇ／ｍｌ时，随着添加浓度的增大，轮虫的种群增殖率Ｒ值也增大。以添加５．００μｇ／ｍｌ为最佳，第４天的Ｒ值达０．７５，是对照组的５．６倍。添加维生素Ｄ０．００５～０．２０μｇ／ｍｌ对轮虫的增殖有一定促进作用，以添加０．０５μｇ／ｍｌ为最佳，第７天的Ｒ值为０．４０７，是对照组的２．７倍。添加维生素Ｅ０．００１～０．０１μｇ／ｍｌ和添加维生素Ｋ０．０１～０．１０μｇ／ｍｌ时，第４天的Ｒ值与对照组无差异。     

On a class of variational equations transformable to the Gauss hypergeometric equation

A new class of linear ordinary differential equations with periodic coefficients is found which can be transformed to the Gauss hypergeometric equation, and therefore the monodromy matrices are computable explicitly. These equations appear as the variational equations around a straight-line solution in Hamiltonian systems of the form H = T(p) + V(q), where T(p) and V(q) are homogeneous functions of p and q, respectively.     

Radiative Shock Experiments At Luli

We present the set-up and the results of a supercritical radiative shock experiment performed with the LULI nanosecond laser facility. Using specific designed targets filled with xenon gaz at low pressure, the propagation of a strong shock with a radiative precursor is evidenced. The main measured quantities related to the shock (electronic density, propagation velocities, temperature, radial dimension) are presented and compared with various numerical simulations.     

A polarimetric study of Asteroid 25143 Itokawa

The near-Earth Asteroid 25143 Itokawa, the target of the Japanese space mission Hayabusa, was observed in June, 2004 with the Torino photopolarimeter attached at the 2.15 m telescope of the El Leoncito Observatory (Argentina). The degree of linear polarization in five colors was measured over a wide range of phase angles, between 40° and 80°. The data obtained are sufficient to derive an estimate of the asteroid's albedo of 0.24±0.01, which is in good agreement with the S-type taxonomic classification of this object. The phase-polarization curve has been sampled in UBVRI colors, covering a wide range of phase angles that cannot be reached by Earth-based observations of Main Belt asteroids.     

丹江口水库及其邻区地壳应力场的基本特征

利用赤平极射投影等资料，计算了丹江水库及邻区的主应力方向，结果表明：主压应力为北东东向，主张应力为北北西向，现代构造应力场与新生代以来应力场基本一致；晚第三纪以来，该区地壳应力场相对稳定。     

The development of Fe-nodules surrounding biological material mediated by microorganisms

Takashikozo is a phenomenon of Quaternary sediments in Japan. They are cylindrical Fe-oxyhydroxide nodules that form as plaques round plant roots, where Fe is preferentially concentrated to develop a solid wall. Structural features suggest that after the roots have decayed, the central space where the roots were situated acts as a flow path for oxidized water. Analysis of microbial 16S rDNA extracted from the nodules identified iron-oxidizing bacteria encrusted round the roots where they are the likely initiators of nodule formation. Direct microscopic observation revealed an accumulation of Fe-oxyhydroxides that fill the pore spaces and is also likely to be linked with the encrusting microbial colonies. Geological history and nanofossil evidence suggest that these Fe-nodules may have been buried at a depth of up to several tens of meters for at least 10⁵ years in reducing Quaternary sediments. Thus Fe-oxyhydroxide nodules that have formed in a geological environment at the interfaces between water and rock by microbial mediation can persist under reducing conditions. If this is the case, the phenomenon is significant as an analogue of post-closure conditions in radioactive waste repositories, since it could influence nuclide migration.