Structural and geochemical studies on amphibolite and greenschist-facies rocks in the Kulidjik river valley, eastern Rhodope, Bulgaria: preliminary results

2006 ◽  
Vol 239 (2) ◽  
pp. 161-181
Author(s):  
Nikolay Bonev
Keyword(s):  
River Valley ◽  
Greenschist Facies ◽  
Preliminary Results ◽  
Geochemical Studies

scholarly journals Composition, structure and formation conditions of the Arydzhangsky Formation of the Maimecha-Kotuy District of the Siberian Trap Province

2022 ◽  
Vol 962 (1) ◽  
pp. 012059
Author(s):  
R V Shtokalo ◽  
N A Krivolutskaya ◽  
A A Konyshev ◽  
I T Rass ◽  
S I Demidova
Keyword(s):  
Electron Microscope ◽  
Scanning Electron Microscope ◽  
Relative Position ◽  
River Valley ◽  
Siberian Trap ◽  
Formation Conditions ◽  
Composition Structure ◽  
Geochemical Studies ◽  
Scanning Electron

Abstract We studied 6 sections of the Arydzhangsky lava formation (P2-T1) in the Kotuy river valley. The results of petrographic and geochemical studies of the composition of rocks of the Arydzhangsky, Khardaksky and Pravoboyarsky formations are presented. The stratigraphic columns of the sections were built and the composition of the rocks was additionally determined using a scanning electron microscope. In this regard, the relative position of these formations was established, the mantle and crust sources of magmas were confirmed. A geochemical identity of the rocks of the Khardaksky formation with the rocks of the Arydzhangsky formation was established, which suggests a similar age of their formation.

scholarly journals Organic geochemical studies of soils from the Rothamsted Classical Experiments—IV. Preliminary results from a study of the effect of soil pH on organic matter decay

1998 ◽  
Vol 29 (5-7) ◽  
pp. 1779-1795 ◽  
Author(s):  
Pim F van Bergen ◽  
Chris J Nott ◽  
Ian D Bull ◽  
Paul R Poulton ◽  
Richard P Evershed
Keyword(s):  
Organic Matter ◽  
Soil Ph ◽  
Preliminary Results ◽  
Geochemical Studies

Mercury, PM2.5 and gaseous co-pollutants in the Ohio River Valley region: Preliminary results from the Athens supersite

2006 ◽  
Vol 40 (34) ◽  
pp. 6650-6665 ◽  
Author(s):  
Reddy L.N. Yatavelli ◽  
Jason K. Fahrni ◽  
Myoungwoo Kim ◽  
Kevin C. Crist ◽  
Christopher D. Vickers ◽  
...  
Keyword(s):  
River Valley ◽  
Ohio River ◽  
Ohio River Valley ◽  
Preliminary Results

LANDSCAPE EVOLUTION AND STREAM TERRACES OF THE WHITEWATER RIVER VALLEY, MINNESOTA: PRELIMINARY RESULTS

2020 ◽  
Author(s):  
Daniel Gardner ◽  
◽  
Shanti Penprase ◽  
Phillip H. Larson ◽  
Andrew D. Wickert ◽  
...  
Keyword(s):  
Landscape Evolution ◽  
River Valley ◽  
Preliminary Results

THE NATURAL AND ANTHROPOGENIC EVOLUTION OF THE BIEBŁA RIVER VALLEY AND THE RECORD OF ENVIRONMENTAL CHANGES IN ITS ALLUVIA - PRELIMINARY RESULTS

2021 ◽  
Vol 8 (1) ◽  
pp. 35-39
Author(s):  
Krzysztof Żurek ◽  
Tomasz Kalicki ◽  
Fularczyk Karolina ◽  
Paweł Przepióra ◽  
Piotr Kusztal
Keyword(s):  
Environmental Changes ◽  
River Valley ◽  
Preliminary Results ◽  
Anthropogenic Evolution

The O–C diagrams of minor planets − a new approach to modelling the rotation

1999 ◽  
Vol 173 ◽  
pp. 185-188
Author(s):  
Gy. Szabó ◽  
K. Sárneczky ◽  
L.L. Kiss
Keyword(s):  
Error Analysis ◽  
Time Dependence ◽  
Theoretical Work ◽  
Minor Planet ◽  
Minor Planets ◽  
New Approach ◽  
Preliminary Results ◽  
Ccd Observations

AbstractA widely used tool in studying quasi-monoperiodic processes is the O–C diagram. This paper deals with the application of this diagram in minor planet studies. The main difference between our approach and the classical O–C diagram is that we transform the epoch (=time) dependence into the geocentric longitude domain. We outline a rotation modelling using this modified O–C and illustrate the abilities with detailed error analysis. The primary assumption, that the monotonity and the shape of this diagram is (almost) independent of the geometry of the asteroids is discussed and tested. The monotonity enables an unambiguous distinction between the prograde and retrograde rotation, thus the four-fold (or in some cases the two-fold) ambiguities can be avoided. This turned out to be the main advantage of the O–C examination. As an extension to the theoretical work, we present some preliminary results on 1727 Mette based on new CCD observations.

Cyclic Evolution of Sunspots: Gleaning New Results from Old Data

2000 ◽  
Vol 179 ◽  
pp. 163-165
Author(s):  
S. K. Solanki ◽  
M. Fligge ◽  
P. Pulkkinen ◽  
P. Hoyng
Keyword(s):  
Sunspot Number ◽  
Sunspot Cycle ◽  
Preliminary Results ◽  
Butterfly Diagram

AbstractThe records of sunspot number, sunspot areas and sunspot locations gathered over the centuries by various observatories are reanalysed with the aim of finding as yet undiscovered connections between the different parameters of the sunspot cycle and the butterfly diagram. Preliminary results of such interrelationships are presented.

Systematic effects in observed parallaxes

1978 ◽  
Vol 48 ◽  
pp. 31-35
Author(s):  
R. B. Hanson
Keyword(s):  
Error Estimates ◽  
Zero Point ◽  
Absolute Zero ◽  
Apparent Magnitude ◽  
Coherent System ◽  
Preliminary Results ◽  
General Catalogue ◽  
Systematic Effects ◽  
New Evidence ◽  
Right Ascension

Several outstanding problems affecting the existing parallaxes should be resolved to form a coherent system for the new General Catalogue proposed by van Altena, as well as to improve luminosity calibrations and other parallax applications. Lutz has reviewed several of these problems, such as: (A) systematic differences between observatories, (B) external error estimates, (C) the absolute zero point, and (D) systematic observational effects (in right ascension, declination, apparent magnitude, etc.). Here we explore the use of cluster and spectroscopic parallaxes, and the distributions of observed parallaxes, to bring new evidence to bear on these classic problems. Several preliminary results have been obtained.

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