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## Experimental study of pile sinking by pressure

### Soil Mechanics and Foundation Engineering (1969-09-01) 6: 343-345 , September 01, 1969

## The strength of clay sapropel

### Soil Mechanics and Foundation Engineering (1969-01-01) 6: 25-28 , January 01, 1969

## Gas-chromatographic investigations on dimethyldioctadecyl ammonium derivatives of different clay minerals

### Contributions to Mineralogy and Petrology (1969-02-01) 21: 53-62 , February 01, 1969

The gas-chromatographic behaviour (selectivity performance for cyclohexanebenzene and m-, p-xylenes pairs separation) of dimethyldioctadecylammonium complexes with kaolinite, fire-clay, halloysite, attapulgite, hectorite and various montmorillonites, nontronites and vermiculites has been investigated. The obtained data indicate the influence of specific surface and charge density on relative retention value (α), and of substitution location (tetrahedral versus octahedral sheet) within the clay lattice on selectivity. Hence, derivatives with nontronites and vermiculites, that is the clay minerals where the principal lattice substitutions are predominantly occurring within the tetrahedral sheet and possessing the highest surface charge density, are very effective sorbents for gas-chromatographic use. The application of gas-chromatography as investigation tool of clays surface is suggested.

## A slide rule for determining the index properties of soils

### Soil Mechanics and Foundation Engineering (1969-11-01) 6: 428-429 , November 01, 1969

## Principles of building design on soils prone to slump-type settlement owing to wetting (presented for discussion)

### Soil Mechanics and Foundation Engineering (1969-11-01) 6: 420-423 , November 01, 1969

## A note on stilpnomelane mineralogy

### Contributions to Mineralogy and Petrology (1969-07-01) 23: 86-88 , July 01, 1969

Stilpnomelane analyses are classified into two separate groups of ferro- and ferristilpnomelanes on the H_{2}O(+)-Fe_{2}O_{3}/(Fe_{2}O_{3}+FeO) diagram. The relation is not comparable with that of oxyhornblende.

## Markov chains and embedded Markov chains in geology

### Journal of the International Association for Mathematical Geology (1969-03-01) 1: 79-96 , March 01, 1969

Geological data are structured as first-order, discrete-state discrete-time Markov chains in two main ways. In one, observations are spaced equally in time or space to yield transition probability matrices with nonzero elements in the main diagonal; in the other, only state transitions are recorded, to yield matrices with diagonal elements exactly equal to zero. The mathematical differences in these two approaches are reviewed here, using stratigraphic data as an example. Simulations from chains with diagonal elements greater than zero always yield geometric distributions of lithologic unit thickness, and their use is recommended only if the input data have the same distribution. For thickness distributions lognormally or otherwise distributed, the embedded chain is preferable. The mathematical portions of this paper are well known, but are not readily available in publications normally used by geologists. One purpose of this paper is to provide an explicit treatment of the mathematical foundations on which applications of Markov processes in geology depend.

## Determining the load-bearing capacity of pillars when working thin sheet-like slanting ore beds in a ledge-rock mass

### Soviet Mining (1969-07-01) 5: 386-390 , July 01, 1969

## Terrestrial heat flow in various parts of India

### Bulletin Volcanologique (1969-03-01) 33: 69-88 , March 01, 1969

Results of heat flow studies made in different parts of India including Kolar Gold Field, Cuddapah basin, Singhbhum thrust zone, Aravalli mountain system of Precambrian age, Godavary valley of Mesozoic age and Cambay basin of Cenozoic age are discussed. Heat flow has been found to be low in the southern part of the Preambrian shield. Relatively higher values have been obtained along the northeastern (Singhbhum) and the northwestern parts of the shield (Aravallies). High heat flow has been found along the southeastern part of the Godavary valley and the Cambay basin. The correlation of heat flow with geology and tectonic history in the respective areas is discussed.

## Empirical relationships involving the global radiation intensity and ambient temperature at various latitudes and altitudes

### Archiv für Meteorologie, Geophysik und Bioklimatologie, Serie B (1969-03-01) 17: 1-20 , March 01, 1969

### Summary

Montly mean values of the global radiation intensity (*Q*_{s}) and the screen temperature (*T*) for a year have been gathered from 67 places at latitudes below 60 degrees. Plotting temperature versus radiation in each case yiclds a loop, whose range, mid-point, area and general slope have been evaluated. Various regularities have been discovered in the interrelationships of these features, and between them and the altitude, the upwind distance overland (*d*), and the latitude (*A*). Annual means of the radiation (Q_{s} cal/cm^{s} · min) and the temperature corrected for altitude (*T*_{c}°C) are connected thus: T_{c}/Q_{s}=102−1.2A. The quotient of the annual ranges of monthly mena temperatures and global radiation intensities (*R*_{T}/R_{Q}) varies as*d*^{0.2}

The empirical relationships allow approximate estimation of the annual loop of radiation and temperature of any place at a latitude less than 60 degrees. For this, it is necessary to know only the latitude, altitude and the overland distance upwind, so this method of obtaining indicative values of the monthly mean global radiation intensity and screen temperature may be useful for poorlyinstrumented regions.