Isoprenoid alkanes with irregular “head-to-head” linkages     

Al.A. Petrov  N.S. Vorobyova  Z.K. Zemskova 《Organic Geochemistry》1990,16(4-6)

A lightly biodegraded crude oil from the Tolkinsk field (Upper Jurassic), situated in north-west Siberia, was found to contain a series of C₂₈–C₃₉ isoprenoid alkanes. Most of these components contain a pristane unit linked head-to-head with other isoprenoid units. The structures of these components were elucidated by mass spectral interpretations, comparisons with a synthesised standard and by reference to data published previously in the literature. These results extend the carbon number range, the variety of structural types, and the number of reported occurrences of these compounds in geological samples. These results provide further evidence for a contribution of bacterial cell-wall lipids to crude oils.  相似文献   

Geothermal energy potential of eastern desert region,Egypt     

D. Chandrasekharam  A. Lashin  N. Al Arifi  A. Al Bassam  C. Varun  H. K. Singh 《Environmental Earth Sciences》2016,75(8):697

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Kinematics of the bottom of the Eurasia Basin near the Spitsbergen domain     

Al. A. Schreider  A. A. Schreider  A. E. Sazhneva  V. A. Sychev  O. A. Zuev 《Oceanology》2016,56(5):721-732

Prior to extension of the lithosphere in the Eurasia Basin, the Yermak Plateau was an element of the Eurasian Arctic margin. Extension of the Barents Sea shelf culminated gradually in rifting of the continental crust with separation of this block from the continent during Chrons C25r?C26n (57.656?59.237 Ma ago) and emplacement of numerous basic dikes, which could be responsible for the formation of high-amplitude magnetic anomalies on the Yermak Plateau. The investigation included reconstruction of axes in the breakup zones along peripheral continental fragments of Spitsbergen with determination of the Euler poles and angles of rotation, which describe the kinematics of this process. It is revealed that the difference between depths of conjugate isobaths can be as large as many tens of meters, which reflects the nonuniformly scaled slide of peripheral areas of the continental crust along the plane of the crustal-penetrating fault and, correspondingly, their different subsidence during rifting.  相似文献   

Ionized gas in the circumgalactic vicinity of the M81 galaxy group     

M. N. Al Najm  O. L. Polikarpova  Yu. A. Shchekinov 《Astronomy Reports》2016,60(4):389-396

The dynamics of the dust and gas in the tidal region of the M81 galaxy group have been analyzed, and the drift of the dust relative to the gas has been estimated, including the drift due to the action of radiation pressure from stars in M81. It is concluded that a large fraction of the gas in the tidal region is in the form of ionized hydrogen HII that shields the observedHI gas from the extragalactic Lyman continuum: the observed atomic gas could be only 10% of the total mass of gas. Only then it is possible to satisfactorily explain the excess dust abundance, which exceeds the Galactic value by a factor of six. By analogy, extended HI disks in galaxies with sizes appreciably larger than the stellar disks could be surrounded by HII envelopes with a comparable or greater mass. Such disks could play an important role in supporting prolonged star formation in galaxies with extended HI disks. Associated observational manifestations are discussed. Such HII envelopes outside HI disks could be detectable in absorption in Ly α and lines of ions of heavy elements.  相似文献   

Transtension of the Romanche transform fault     

Al. A. Schreider  A. A. Schreider  A. A. Bulychev  E. Lodolo  G. L. Kashintsev 《Oceanology》2006,46(5):683-691

Areas of transtension are discovered in the western part of the Romanche transform fault. Geodynamical parameters of the transtension are calculated on the basis of three-dimensional modeling of the inversive magnetic layer using survey data. The interval spreading rates calculated on this basis appeared to be smaller (1.65 cm/y for paleoanomalies C1-C5E on the northern side of the fault and 1.56 cm/y for paleoanomalies C6–C24 on the southern side) than those derived from the theoretical concepts based on the NUVEL-1 and NUVEL-1A models.  相似文献   

Measurement of the influence of salinity on floc density and strength   总被引：3，自引：0，他引：3  

S. Al Ani  K. R. Dyer  D. A. Huntley 《Geo-Marine Letters》1991,11(3-4):154-158

The effective density and the strength of flocs formed in the laboratory from mud from the Tamar Estuary reached a maximum value at a salinity of 10–15‰ within the concentration range studied (0.1–1.0 g liter⁻¹). For a constant salinity and concentration, the density decreases with increasing floc size. The strength of the flocs increases with the floc diameter. However, the strength of the individual particle bonds within the floc decreases with size. Large flocs were relatively more brittle than smaller ones. The results suggest that larger flocs may be disrupted by the formation of unequal fragments.  相似文献   

Multivariate statistical analysis and environmental isotopes of Amman/Wadi Sir (B2/A7) groundwater,Yarmouk River Basin,Jordan     

Mutewekil Mamdouh Obeidat  Muheeb Awawdeh  Fahmi Abu Al‐Rub 《水文研究》2013,27(17):2449-2461

Multivariate statistical techniques, cluster and factor analyses were applied on the Amman/Wadi Sir groundwater chemistry, Yarmouk River basin, north Jordan. The main objective was to investigate the main processes affecting the groundwater chemical quality and its evolution. The k‐means cluster analysis yields three groups with distinct ionic concentrations. Cluster 1 comprises the vast majority of the sampled wells, and the water that belongs to this cluster can be classified as freshwater. Cluster 2 comprises only 2% of the sampled wells; it has the highest ionic concentration. The water of this cluster can be classified as brackish water. Cluster 3 involves 23% of the sampled wells, and it has total ionic concentration intermediate to that of clusters 1 and 2. Factor analysis yields a three‐factor model, which explains 76.77% of the groundwater quality variation. Factor 1 ‘salinity factor’ involves EC, Na⁺, Cl^‐, SO₄^‐2, K⁺ and Mg⁺² and reflects groundwater salinization because of overpumping. Factor 2 ‘hardness factor’ includes Ca⁺², HCO₃^‐ and the pH value and signifies soil–water/rock interaction. Factor 3 ‘nitrate factor’ involves only NO₃^‐ and points to groundwater contamination because of human activities, mainly untreated wastewater, and crops and animal cultivation in the unconfined portion of the aquifer. Factors 1 and 3 can be described as human‐induced factors, whereas factor 2 can be described as geogenic factor. Factors' scores were mapped to deduce the controlling processes on the groundwater chemistry. Stable isotope composition of ¹⁸O and ²H has revealed that the groundwater is a mixture of two water types. The radioactive isotopes tritium and ¹⁴ C were used to evaluate present day recharge to the aquifer and to estimate the groundwater age, respectively. Present day recharge to the groundwater is taking place in the unconfined portion of the aquifer as it is indicated by the measurable tritium content and low groundwater age. Copyright © 2012 John Wiley & Sons, Ltd.  相似文献   

GIS-Oriented Database on Seismic Hazard Assessment for Caucasian and Crimean Regions     

Soloviev  An. A.  Soloviev  Al. A.  Gvishiani  A. D.  Nikolov  B. P.  Nikolova  Yu. I. 《Izvestiya Atmospheric and Oceanic Physics》2018,54(9):1363-1373

Izvestiya, Atmospheric and Oceanic Physics - Zones of higher seismic hazard occupy about 20% of Russia’s territory, and 5% are characterized by extremely high hazard. These latter are, in...  相似文献   

Determining Water Depths for Monitoring Coastal Water Quality Using Multiple Functional Traits of Periphytic Protozoa in Marine Ecosystems     

Guo  Congcong  Bai  Xiaoyun  Abdullah Al  Mamun  Sikder  Mohammad Nurul Azim  Xu  Henglong 《Ocean Science Journal》2019,54(1):87-95

Ocean Science Journal - Biological trait analysis (BTA) of protozoan communities has been used a useful bioindicator of environmental quality status in marine ecosystems. To determine the optimal...  相似文献   

First evidence for episodic flooding events in the arid interior of central Saudi Arabia over the last 60 ka     

Sue J. McLaren  Farhan Al‐Juaidi  Mark D. Bateman  Andrew C. Millington 《第四纪科学杂志》2009,24(2):198-207

Although evidence for Quaternary environmental changes in the Arabian Peninsula is now growing, research has mostly been conducted in the United Arab Emirates (UAE) and in the Sultanate of Oman. There have been virtually no recent studies in Saudi Arabia, especially in the central region such as around Al‐Quwaiayh. In this area there are a series of outwash plains developed along the eastern edge of the Arabian Shield that formed in the late Quaternary. Four sedimentary sections, which are representative of the deposits that have accumulated, have been studied and five luminescence ages obtained. These are the first luminescence ages acquired from Quaternary sediments in central Saudi Arabia. The preserved fluvial deposits in the study area have formed during humid events at ca. 54 ka, ca. 39 ka and ca. 0.8 ka. In more recent times aeolian sands have been encroaching on to the distal parts of the outwash plains. Copyright © 2008 John Wiley & Sons, Ltd.  相似文献