scholarly journals Helium isotope studies of the Central Tien Shan

2021 ◽  
Vol 929 (1) ◽  
pp. 012005
Author(s):  
B G Polyak ◽  
E A Bataleva ◽  
A K Rybin
Keyword(s):  
Gas Phase ◽  
Water Samples ◽  
Tien Shan ◽  
Helium Isotope ◽  
Helium Isotopes ◽  
Mineral Springs ◽  
Central Asian ◽  
Mantle Helium ◽  
Isotope Studies ◽  
Stable Structures

Abstract The research shows new results of isotope-helium studies carried out in the Tien Shan - Naryn and Atbashi basins. Sampling of thermal mineral springs in the Eastern Tien Shan was carried out in order to identify traces of mantle emanations in fluids and to assess the degree of permeability of the Earth’s crust for the introduction of deep masses, which would make it possible to clarify the nature of the interaction of the crust and mantle in the zone of recent orogeny. Concentrations of helium isotopes were measured in gas and water samples from 6 thermal mineral springs in the Central Tien Shan. It was found that fluids from three sources contain an abnormally high amount of mantle helium. In the gases of the Narzan source, the ratio 3He/4He in the gas phase (597÷600) × 10−8 reaches the Central Asian maximum found earlier on the Fergana ridge in the Kyzyl-Beles source (510÷630) × 10−8. The obtained results support the ideas on the existence of two sublatitudinal positive helium isotope anomalies on the northern and southern flanks of the Eastern Tien Shan - in the zones of junction of the epiplatform neoorogene with more ancient tectonically stable structures.

Gas-Phase Clustering of NO+ with H2S and H2O

2007 ◽  
Vol 72 (8) ◽  
pp. 1122-1138 ◽  
Author(s):  
Milan Uhlár ◽  
Ivan Černušák
Keyword(s):  
Hydrogen Bonds ◽  
Water Molecule ◽  
Gas Phase ◽  
Saddle Points ◽  
Solvent Molecule ◽  
Local Minima ◽  
Additional Water ◽  
Three Body ◽  
Rain Formation ◽  
Stable Structures

The complex NO+·H2S, which is assumed to be an intermediate in acid rain formation, exhibits thermodynamic stability of ∆Hº300 = -76 kJ mol-1, or ∆Gº300 = -47 kJ mol-1. Its further transformation via H-transfer is associated with rather high barriers. One of the conceivable routes to lower the energy of the transition state is the action of additional solvent molecule(s) that can mediate proton transfer. We have studied several NO+·H2S structures with one or two additional water molecule(s) and have found stable structures (local minima), intermediates and saddle points for the three-body NO+·H2S·H2O and four-body NO+·H2S·(H2O)2 clusters. The hydrogen bonds network in the four-body cluster plays a crucial role in its conversion to thionitrous acid.

scholarly journals Pitch angle distribution of trapped energetic protons and helium isotope nuclei measured along the Resurs-01 No. 4 LEO satellite

2005 ◽  
Vol 23 (9) ◽  
pp. 2983-2987 ◽  
Author(s):  
A. Leonov ◽  
M. Cyamukungu ◽  
J. Cabrera ◽  
P. Leleux ◽  
J. Lemaire ◽  
...  
Keyword(s):  
Pitch Angle ◽  
Helium Isotope ◽  
Helium Isotopes ◽  
Angle Distribution ◽  
Strip Detectors ◽  
Direct Measurements ◽  
He Isotopes ◽  
Silicon Strip Detectors ◽  
Leo Satellite ◽  
Momentum Direction

Abstract. The NINA detector on board the Resurs-01 No. 4 satellite (835 km, 98° inclination) is equipped with particle trackers based on silicon strip detectors. From the energy deposited in each of its silicon layers the mass, the momentum direction and energy of incident particles have been determined. The resolutions in mass and energy allow identification of H and He isotopes over the 10-50 MeV/n energy range. The angular resolution is about 2.5°. We present the direct measurements of proton and helium isotopes pitch angle distributions derived from Resurs-01 No.4/NINA observations and their variations as functions of (B, L) coordinates and energy. The measurements of trapped helium isotopes spectrum are also presented.

scholarly journals Geological evolution of Central Asian Basins and the western Tien Shan Range

2017 ◽  
Vol 427 (1) ◽  
pp. 1-17 ◽  
Author(s):  
Marie-Françoise Brunet ◽  
Edward R. Sobel ◽  
Tom McCann
Keyword(s):  
Tien Shan ◽  
Central Asian ◽  
Geological Evolution

scholarly journals Runoff modelling in glacierized Central Asian catchments for present-day and future climate

2006 ◽  
Vol 37 (2) ◽  
pp. 93-105 ◽  
Author(s):  
W. Hagg ◽  
L.N. Braun ◽  
M. Weber ◽  
M. Becht
Keyword(s):  
Tien Shan ◽  
Water Shortages ◽  
Time Step ◽  
Climate Conditions ◽  
Central Asian ◽  
Complex Picture ◽  
Daily Time Step ◽  
The Alps ◽  
High Degree ◽  
Tien Shan Mountains

A conceptual precipitation–runoff model was applied in five glacierized catchments in Central Asia. The model, which was first developed and applied in the Alps, works on a daily time step and yields good results in the more continental climate of the Tien Shan mountains for present-day climate conditions. Runoff scenarios for different climates (doubling of CO2) and glacierization conditions predict an increased flood risk as a first stage and a more complex picture after a complete glacier loss: a higher discharge during spring due to an earlier and more intense snowmelt is followed by a water deficiency in hot and dry summer periods. This unfavourable seasonal redistribution of the water supply has dramatic consequences for the Central Asian lowlands, which depend to a high degree on the glacier melt water for irrigation and already nowadays suffer from water shortages.

scholarly journals Three new species of Scythrididae from the northern Tien-Shan Mountains (Lepidoptera: Scythrididae)

2019 ◽  
Vol 22 (2) ◽  
pp. 121-128
Author(s):  
Kari Nupponen ◽  
Sergey Yu. Sinev
Keyword(s):  
New Species ◽  
Tien Shan ◽  
Single Female ◽  
Central Asian ◽  
Unknown Species ◽  
The Family ◽  
Three New Species ◽  
Tien Shan Mountains ◽  
Northern Tien Shan

Three new species of the family Scythrididae are described from Central Asian mountains: Scythris cultelloides Nupponen & Sinev, sp. n., S. danilevskyi Nupponen & Sinev, sp. n. and S. ganesha Nupponen & Sinev, sp. n. One unknown species is reported but not formally described because only a single female is available.

scholarly journals Determination of Chemical Oxygen Demand in Water Samples Using Gas-phase Molecular Absorption Spectrometry

2020 ◽  
Vol 36 (7) ◽  
pp. 841-846
Author(s):  
Xiaomin CHEN ◽  
Lian PENG ◽  
Jingcheng WANG ◽  
Debing ZHANG ◽  
Yong ZHAO ◽  
...  
Keyword(s):  
Chemical Oxygen Demand ◽  
Gas Phase ◽  
Water Samples ◽  
Oxygen Demand ◽  
Absorption Spectrometry ◽  
Molecular Absorption ◽  
Molecular Absorption Spectrometry
Sign in / Sign up

Export Citation Format

Share Document