勘探坑道掘进凿岩的机械化          下载免费PDF全文

高森  A..瓦伊波林  Ю.M.米斯尼克  M.И.什克烈罗夫 《探矿工程》1958,(12)

人力劳动在地质勘探及工程地质工作中仍占有相当的地位,其中勘探坑道掘进用人力打眼的工作是繁重的。例如,在中硬岩石中钻进深1．5公尺及直径35公厘的一个孔,就需要3．14工时。掘进勘探坑道时由于缺乏动力来源,采用现有凿岩机械在一些情况下又不可能,所以工作量很大的繁重而成本高的人力凿岩工作急切需要使之机械化。  相似文献   

向钻孔中定位下降钻具的新方法          下载免费PDF全文

B.M.马特洛索夫  任宏远 《探矿工程》1958,(2)

向钻孔中定位下降钻具的现行的方法还是相当复杂的,并且要占去很多时间。所建议的向钻孔中定位下降工具的方法是简单的,有一些预先的准备工作与下降普通钻具时没有什么区别。按这种方法下降钻具是借助于以普通提引器为基础设计的特殊仪器来进行（图1）。  相似文献   

岩石破碎统一过程的假说          下载免费PDF全文

B.M.费多罗夫  房世俊 《探矿工程》1958,(2)

破碎过程的主要内容大家都知道,岩石是一种易碎物质,图1中的图表便可说明它的性质。我们往岩石上加负荷时,使岩石具有压缩弹性位能。此弹性位能在岩石破碎时变为生成新表面的动能。这种现象是岩石机械破碎过程最常见的一般规律。  相似文献   

礦床的勘探方法及原則     

B.M.克列特尔  謝仲武  張玉华  刘銘銓  王貴安  史崇周  張肇元 《中国地质》1958,(4)

普查勘探学是地质科学中的一门新的年青的学科,它与采矿机械学的关系最为密切。在资本主义世界里这门科学暂时还没有得到认识,虽然在A.巴特曼(A.Batniau)的巨著“工业矿床”一书中已经指出了认识这一学科的必要。由此可见,勘探学的基础是十分薄弱的,也正因为如此,在现有的书籍中十分缺乏勘探方法和原则的阐述和规定。  相似文献   

Aircraft observations of electrical conductivity in warm clouds     

P. Ernest Raj  P. C. S. Devar  A. M. Selvam  A.S.R. Murty 《大气科学进展》1993,10(1):95-102

Aircraft observations of electrical conductivity and cloud microphsical, dynamical and other electrical parameters were made in warm stratocumulus and cumulus clouds forming during the summer monsoon seasons (June-September) of 1983 and 1985 in the Deccan Plateau region, India. A Gerdien type cylindrical condenser was used for the measurement of electrical conductivity. The variations in the electrical conductivity are observed to be closely associated with the updrafts and downdrafts in the cloud, liquid water content, cloud droplet charge and coro-na discharge current. The value of electrical conductivity in warm clouds is found to be in the order of 10-12 ohm-1 m-1 which is two orders higher than that observed in clear-air at cloud-base levels in some regions by other investigators.Classical static electricity concepts predict reduced conductivity values inside clouds. Cloud electrical conductivi-ty measurements, particularly in warm clouds are few and the results are contradictory. The recently identified mech-anism of vertical mixing in clouds lends support to coovective charge separation mechanism with inherent larger than clear-air values for cloud electrical conductivity and therefore consistent with the measurements reported herein.  相似文献   

Stable and Unstable Eigensolutions of Laplace’s Tidal Equations for Zonal Wavenumber Zero   总被引：1，自引：0，他引：1  

Rolf Müller 《大气科学进展》1993,10(1):21-40

Laplace's tidal equations are of great importance in various fields of geophysics. Here, the special case of zonal symmetry (zonal wavenumber m = 0) is investigated, where degenerate sets of eigensolutions appear. New results are presented for the inclusion of dissipative processes and the case of unstable conditions. In both instances the (nonzero) eigenfrequencies are complex. In the latter case, additional stable (i.e. real) eigenfrequencies appear in the numerical results for the absolute value of the Lambparameter ε being larger than a critical value εc. Further, it is shown that any degeneracies are removed through the inclusion of dissipation. Moreover, asymptotic relations are derived employing the relation of Laplace's tidal equations for m = 0 to the spheroidal differential equation. The implications of these findings to numerical techniques are demonstrated and results of computations are presented.  相似文献   

DETERMINATION OF A MULTIVARIATE DETECTION LIMIT AND LOCAL CHEMICAL RANK BY DESIGNING A NON-PARAMETRIC TEST FROM THE ZERO-COMPONENT REGIONS     

YI-ZENG LIANG  OLAV M. KVALHEIM  Department of Chemistry  University of Bergen  N- Bergen  NorwayAGNAR HOSKULDSSON  Danish Engineering Academy  DK- Lyngby  Denmark 《地理学报(英文版)》1993,(4)

In this paper we redefine the term detection limit to embrace the inherent multivariate nature of samples,instrumental measurements and chemometrics resolution procedures. The so-called zero-componentregions, i.e. parts with no chemical components eluting, are used as repeated analytical blanks to estimatea statistical multivariate detection limit for determining the number of chemical species in local regionsof a single two-way chromatogram or a collection of synchronized one-way chromatograms. For two-waychromatography the detection limit is determined from the distribution of the first eigenvalues obtainedfrom all possible combinations of spectra in the zero-component regions. The number of spectra in eachcalculation should correspond to the number included in the later examination of the local retention timeregions. For one-way chromatography on a collection of samples with similar chemical components atvarying concentrations the same procedure is used, with the samples taking the role of the spectra intwo-way chromatography. The detection limit can be chosen at various confidence levels depending onwhether false positive or negative detection of minor components is most critical. The results obtainedfrom the zero-eigenvalue distribution are more robust than those obtained by a previously developedF-test.  相似文献   

THE GEOMETRY OF MULTIVARIATE OBJECT PREPROCESSING     

STANLEY N.DEMING  JOHN A.PALASOTA Department of Chemistry  University of Houston  Houston  TX -  U.S.A.AND JOHN M.NOCERINO United States Environmental Protection Agency  Environmental Monitoring Systems Laboratory  Las Vegas  NV -  U.S.A. Author to whom correspondence should be addressed. 《地理学报(英文版)》1993,(5)

The geometric properties of three common object-preprocessing transformations(constant sum,orclosure;constant length,or normalization;and maximum value,or ratioing)are investigated.Anargument is made for using absolute values in the constant sum and maximum value transformations.In general,each transformation distorts the shape and dimensionality of patterns in the data:transformed data lie on(C-l)-dimensional surfaces in the original C-dimensional space.A data set thathas been closed by one of these transformations can be reopened if a vector containing the constant sums,constant lengths or maximum values of the original objects was retained.Transformed data sets may befreely interconverted among these three transformations without the loss of information.  相似文献   

天然金刚石中的固相二氧化碳     

Schr.  M 胡季平 《地质科学译丛》1994,11(1):4-6,82

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第二个格陵兰冰盖项目（GISP2）：揭开地球气候系统之迹     

Morri.  M  刘伟 《国土资源信息化》1994,(4):43-44

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