Zaloguj się

Gotowe bibliografie tematyczne / Hydrogen isotopic composition / Artykuły w czasopismach

Kliknij ten link, aby zobaczyć inne rodzaje publikacji na ten temat: Hydrogen isotopic composition.

Artykuły w czasopismach na temat „Hydrogen isotopic composition”

Autor: Grafiati

Data publikacji: 6 września 2023

Data aktualizacji: 31 lipca 2025

Utwórz poprawne odniesienie w stylach APA, MLA, Chicago, Harvard i wielu innych

Wybierz rodzaj źródła:

Sprawdź 50 najlepszych artykułów w czasopismach naukowych na temat „Hydrogen isotopic composition”.

Przycisk „Dodaj do bibliografii” jest dostępny obok każdej pracy w bibliografii. Użyj go – a my automatycznie utworzymy odniesienie bibliograficzne do wybranej pracy w stylu cytowania, którego potrzebujesz: APA, MLA, Harvard, Chicago, Vancouver itp.

Możesz również pobrać pełny tekst publikacji naukowej w formacie „.pdf” i przeczytać adnotację do pracy online, jeśli odpowiednie parametry są dostępne w metadanych.

Przeglądaj artykuły w czasopismach z różnych dziedzin i twórz odpowiednie bibliografie.

1

Natarajan, Surendar. "Estimation of Surface and Groundwater Interaction by Stable Isotopic Techniques – A Case Study of Chengalpattu District, OMR Region." Nature Environment and Pollution Technology 23, no. 3 (2024): 1559–68. http://dx.doi.org/10.46488/nept.2024.v23i03.025.

Pełny tekst źródła

Streszczenie:

Isotopes are atoms of an element having the same atomic number but different mass numbers. Isotopes in hydrology and water resources are used for identifying its occurrence, movement, residence times, recharge, and discharge process. Stable isotopes of hydrogen(δ2H) and oxygen(δ2O) are used for identifying the surface and groundwater interactions as they constitute hydrogen and oxygen. In this study oxygen and hydrogen stable isotopes are used to identify surface and groundwater interaction in Old Mahabalipuram Road (OMR) regions of Chengalpattu district. The precipitation, lake, surface, and

Style APA, Harvard, Vancouver, ISO itp.

2

Hürkamp, Kerstin, Nadine Zentner, Anne Reckerth, et al. "Spatial and Temporal Variability of Snow Isotopic Composition on Mt. Zugspitze, Bavarian Alps, Germany." Journal of Hydrology and Hydromechanics 67, no. 1 (2019): 49–58. http://dx.doi.org/10.2478/johh-2018-0019.

Pełny tekst źródła

Streszczenie:

Abstract High amounts of precipitation are temporarily stored in high-alpine snow covers and play an important role for the hydrological balance. Stable isotopes of hydrogen (δ2H) and oxygen (δ18O) in water samples have been proven to be useful for tracing transport processes in snow and meltwater since their isotopic ratio alters due to fractionation. In 18 snow profiles of two snowfall seasons, the temporal and spatial variation of isotopic composition was analysed on Mt. Zugspitze. The δ18O and δ2H ranged between -26.7‰ to -9.3‰ and -193.4‰ to -62.5‰ in 2014/2015 and between -26.5‰ to -10.5

Style APA, Harvard, Vancouver, ISO itp.

3

Uemura, Ryu, Yudai Kina, Chuan-Chou Shen, and Kanako Omine. "Experimental evaluation of oxygen isotopic exchange between inclusion water and host calcite in speleothems." Climate of the Past 16, no. 1 (2020): 17–27. http://dx.doi.org/10.5194/cp-16-17-2020.

Pełny tekst źródła

Streszczenie:

Abstract. The oxygen and hydrogen isotopic compositions of water in fluid inclusions in speleothems are important hydroclimate proxies because they provide information on the isotopic compositions of rainwater in the past. Moreover, because isotopic differences between fluid inclusion water and the host calcite provide information on the past isotopic fractionation factor, they are also useful for quantitative estimation of past temperature changes. The oxygen isotope ratio of inclusion water (δ18Ofi), however, may be affected by isotopic exchange between the water and the host carbonate. Thus

Style APA, Harvard, Vancouver, ISO itp.

4

Kennedy, Brenda V., and H. Roy Krouse. "Isotope fractionation by plants and animals: implications for nutrition research." Canadian Journal of Physiology and Pharmacology 68, no. 7 (1990): 960–72. http://dx.doi.org/10.1139/y90-146.

Pełny tekst źródła

Streszczenie:

The isotopic compositions of animal tissues, minerals, and fluids reflect those of ingested food and water and inhaled gases. This relationship is illustrated by a review of data pertaining to five light elements of biological interest (carbon, nitrogen, hydrogen, oxygen, and sulphur). Processes affecting the isotopic composition of inorganic compounds in reservoirs are summarized, and isotope fractionation during transfer of elements from these inorganic reservoirs through progressive trophic levels of food webs is discussed. Variability of δ values within and among individuals, populations,

Style APA, Harvard, Vancouver, ISO itp.

5

Qu, Simin, Xueqiu Chen, Yifan Wang, et al. "Isotopic Characteristics of Precipitation and Origin of Moisture Sources in Hemuqiao Catchment, a Small Watershed in the Lower Reach of Yangtze River." Water 10, no. 9 (2018): 1170. http://dx.doi.org/10.3390/w10091170.

Pełny tekst źródła

Streszczenie:

The stable isotopes of oxygen and hydrogen in the water cycle have become a significant tool to study run-off formation, hydrograph separation, and the origin of precipitation. Precipitation assessment based on isotopic data has a potential implication for moisture sources. In the study, δD and δ18O of precipitation samples collected from six rainfall events were analyzed for stable isotope composition to provide implication of isotopic characteristics as well as moisture sources in Hemuqiao basin within Lake Tai drainage basin, eastern China. In these events, stable oxygen and hydrogen isotop

Style APA, Harvard, Vancouver, ISO itp.

6

Pieterse, G., M. C. Krol, A. M. Batenburg, et al. "Global modelling of H<sub>2</sub> mixing ratios and isotopic compositions with the TM5 model." Atmospheric Chemistry and Physics Discussions 11, no. 2 (2011): 5811–66. http://dx.doi.org/10.5194/acpd-11-5811-2011.

Pełny tekst źródła

Streszczenie:

Abstract. The isotopic composition of molecular hydrogen (H2) contains independent information for constraining the global H2 budget. To explore this, we have implemented hydrogen sources and sinks, including their isotopic composition, into the global chemistry transport model TM5. For the first time, a global model now includes a simplified but explicit isotope reaction scheme for the photochemical production of H2. We present a comparison of modelled results for the H2 mixing ratio and isotope composition with available measurements on the seasonal to inter annual time scales for the years

Style APA, Harvard, Vancouver, ISO itp.

7

Li, Xiangnan, Baisha Weng, Denghua Yan, et al. "Anthropogenic Effects on Hydrogen and Oxygen Isotopes of River Water in Cities." International Journal of Environmental Research and Public Health 16, no. 22 (2019): 4429. http://dx.doi.org/10.3390/ijerph16224429.

Pełny tekst źródła

Streszczenie:

Stable hydrogen and oxygen isotopes are important indicators for studying water cycles. The isotopes are not only affected by climate, but are also disturbed by human activities. Urban construction has changed the natural attributes and underlying surface characteristics of river basins, thus affecting the isotopic composition of river water. We collected urban river water isotope data from the Global Network for Isotopes in Rivers (GNIR) database and the literature, and collected river water samples from the Naqu basin and Huangshui River basin on the Tibetan Plateau to measure hydrogen and o

Style APA, Harvard, Vancouver, ISO itp.

8

Abiye, Tamiru A., Molla B. Demlie та Haile Mengistu. "An Overview of Aquifer Physiognomies and the δ18O and δ2H Distribution in the South African Groundwaters". Hydrology 8, № 2 (2021): 68. http://dx.doi.org/10.3390/hydrology8020068.

Pełny tekst źródła

Streszczenie:

A comprehensive assessment of the stable isotope distribution in the groundwater systems of South Africa was conducted in relation to the diversity in the aquifer lithology and corresponding hydraulic characteristics. The stable isotopes of oxygen (18O) and hydrogen (2H) in groundwater show distinct spatial variation owing to the recharge source and possibly mixing effect in the aquifers with the existing water, where aquifers are characterized by diverse hydraulic conductivity and transmissivity values. When the shallow aquifer that receives direct recharge from rainfall shows a similar isoto

Style APA, Harvard, Vancouver, ISO itp.

9

Pieterse, G., M. C. Krol, A. M. Batenburg, et al. "Global modelling of H<sub>2</sub> mixing ratios and isotopic compositions with the TM5 model." Atmospheric Chemistry and Physics 11, no. 14 (2011): 7001–26. http://dx.doi.org/10.5194/acp-11-7001-2011.

Pełny tekst źródła

Streszczenie:

Abstract. The isotopic composition of molecular hydrogen (H2) contains independent information for constraining the global H2 budget. To explore this, we have implemented hydrogen sources and sinks, including their stable isotopic composition and isotope fractionation constants, into the global chemistry transport model TM5. For the first time, a global model now includes a simplified but explicit isotope reaction scheme for the photochemical production of H2. We present a comparison of modelled results for the H2 mixing ratio and isotope composition with available measurements on seasonal to

Style APA, Harvard, Vancouver, ISO itp.

10

Novikov, Dmitry A., Aleksandr N. Pyrayev, Fedor F. Dultsev, Anatoliy V. Chernykh, Svetlana V. Bakustina, and Dmitry V. Ulyanov. "FORMATION CONDITIONS OF GROUNDWATER OF THE UPPER JURASSIC OF THE CENTRAL REGIONS OF THE ZAURAL MEGAMONOCLYSIS." Interexpo GEO-Siberia 2, no. 1 (2021): 181–90. http://dx.doi.org/10.33764/2618-981x-2021-2-1-181-190.

Pełny tekst źródła

Streszczenie:

The article presents the first results of complex isotope-hydrogeochemical studies of reservoir waters of the Upper Jurassic deposits of the central regions of the Zaural megamonoclysis. It was shown that most waters have a narrow distribution of oxygen and hydrogen isotopes (δD from -103.2 to -85.6 ‰ and δO from -15.4 to -12.9 ‰). Some of them have pronounced excursions on the isotopic composition, which indicates a difference in their genesis: from condensate to mixed with ancient infiltrogenic. The isotopic composition of carbon of water-dissolved carbon dioxide (δС from -41.6 to -16.3 ‰) i

Style APA, Harvard, Vancouver, ISO itp.

11

Kakareka, S. V., T. I. Kukharchyk, A. A. Ekaykin, and Yu G. Giginyak. "Stable isotopes in the snow of the coastal areas of Antarctica." Doklady of the National Academy of Sciences of Belarus 65, no. 4 (2021): 495–502. http://dx.doi.org/10.29235/1561-8323-2021-65-4-495-502.

Pełny tekst źródła

Streszczenie:

The first results of study of stable isotopes of oxygen (δ18O) and hydrogen (δD) in the snow samples taken on the islands of Marguerite Bay (Antarctic Peninsula), in the Vecherny Oasis (Enderby Land), and Larsemann Hills (Princess Elizabeth Land) by the participants of the 12th Belarusian Antarctic Expedition (January–March 2020) are presented. The concentration of water isotopes: deuterium (D) and oxygen-18 (18O) in the samples was determined using a laser isotope composition analyzer Picarro L2130. A total of 32 snow samples were analyzed. The statistical parameters of the isotopic compositi

Style APA, Harvard, Vancouver, ISO itp.

12

Hamzić Gregorčič, Staša, Doris Potočnik, Federica Camin, and Nives Ogrinc. "Milk Authentication: Stable Isotope Composition of Hydrogen and Oxygen in Milks and Their Constituents." Molecules 25, no. 17 (2020): 4000. http://dx.doi.org/10.3390/molecules25174000.

Pełny tekst źródła

Streszczenie:

This paper summarises the isotopic characteristics, i.e., oxygen and hydrogen isotopes, of Slovenian milk and its major constituents: water, casein, and lactose. In parallel, the stable oxygen isotope ratios of cow, sheep, and goat’s milk were compared. Oxygen stable isotope ratios in milk water show seasonal variability and are also 18O enriched in relation to animal drinking water. The δ18Owater values were higher in sheep and goat’s milk when compared to cow milk, reflecting the isotopic composition of drinking water source and the effect of differences in the animal’s thermoregulatory phys

Style APA, Harvard, Vancouver, ISO itp.

13

Benbow, Timothy J., Alan R. Hayman, Robert Van Hale, and Russell Frew. "Preparation of aqueous fatty acids for hydrogen and carbon stable isotope analysis by solid phase extraction." Marine and Freshwater Research 64, no. 4 (2013): 294. http://dx.doi.org/10.1071/mf12192.

Pełny tekst źródła

Streszczenie:

Stable isotope analyses of fatty acids in environmental waters provides important information as to their source(s). Analysis is often confounded due to low concentrations of fatty acids and/or a complex sample matrix requiring separation of the target analyte. The purpose of this study was to validate a method to extract fatty acids from natural waters using solid phase extraction (SPE) before compound specific isotope analysis (CSIA). Three SPE cartridges and multiple eluting solvents were tested to determine the efficiency, isotopic fractionation, and reproducibility of each extraction tech

Style APA, Harvard, Vancouver, ISO itp.

14

Feng, Xiahong, Haiting Cui, Kuilian Tang та Laura E. Conkey. "Tree-Ring δD as an Indicator of Asian Monsoon Intensity". Quaternary Research 51, № 3 (1999): 262–66. http://dx.doi.org/10.1006/qres.1999.2039.

Pełny tekst źródła

Streszczenie:

AbstractOxygen and hydrogen isotopic compositions of meteoric water are known to correlate with surface air temperature, except in tropical areas. This relationship has been described using a number of terms corresponding to specific observations, such as latitude, altitude and seasonal effects. However, these temperature effects do not seem to apply to precipitation in monsoonal areas of Asia. Questions have been raised as to whether the isotopic composition of meteoric water can be used to reconstruct paleomonsoon intensity. Tree rings of two modern spruce trees (Picea meyeri) and a 10,000-y

Style APA, Harvard, Vancouver, ISO itp.

15

Fulignati, Paolo, та Adrian J. Boyce. "Stable Isotope (δ18O, δD) Composition of Magmatic Fluids Exsolved from an Active Alkaline Magma Chamber—The Case of the AD 79 Magma Chamber of Vesuvius". Minerals 13, № 7 (2023): 913. http://dx.doi.org/10.3390/min13070913.

Pełny tekst źródła

Streszczenie:

This work documents, for the first time, the calculated oxygen and hydrogen isotope composition of the brines exsolved from the peripheral margin of the active magma alkaline chamber that fed the AD 79 (“Pompei”) eruption of Vesuvius. The exsolved hydrosaline fluids had a constant δ18O composition and a variable δD composition, showing a general lowering of δD at nearly constant δ18O content. We argue that the progressive fluid exsolution at the upper peripheral parts of the AD 79 magma chamber may explain this isotopic path. The modeling of the evolution of the hydrogen isotope composition of

Style APA, Harvard, Vancouver, ISO itp.

16

Wei, Zhifu, Yongli Wang, Gen Wang, et al. "Isotopic Composition of Abiogenic Gas Produced in Closed-System Fischer-Tropsch Synthesis: Implications for the Origins of the Deep Songliao Basin Gases in China." Geofluids 2019 (August 28, 2019): 1–13. http://dx.doi.org/10.1155/2019/2823803.

Pełny tekst źródła

Streszczenie:

In this study, closed-system Fischer-Tropsch synthesis was conducted at 380°C and 30 MPa for 72 h with magnetite as a catalyst. The isotopic composition of the closed-system Fischer-Tropsch synthesis gas and the composition of known abiogenic gas were systematically studied, and the deep Songliao Basin gas was also investigated. The results show that closed-system Fischer-Tropsch synthesis of gaseous hydrocarbon isotopes exhibits a partial reverse order, which includes the reverse order of methane and ethane such as δ13C-C1>δ13C-C2<δ13C-C3 and δ2H-C1>δ2H-C2<δ2H-C3. Furthermore, exp

Style APA, Harvard, Vancouver, ISO itp.

17

Deme, Samiksha, Laurence Y. Yeung, Tao Sun, and Cin-Ty A. Lee. "Stable isotope (C, N, O, and H) study of a comprehensive set of feathers from two Setophaga citrina." PLOS ONE 16, no. 1 (2021): e0236536. http://dx.doi.org/10.1371/journal.pone.0236536.

Pełny tekst źródła

Streszczenie:

Oxygen, hydrogen, carbon and nitrogen stable isotopes were measured on a comprehensive sampling of feathers from two spring Hooded Warblers (Setophaga citrina) in Texas to evaluate isotopic variability between feathers and during molt. Isotopic homogeneity within each bird was found across all four isotopic systems, supporting the hypothesis that molt in these neotropical migrants is fully completed on the breeding grounds. This homogeneity suggests that the isotopic composition of a single feather is may be representative of the whole songbird. However, each bird was found to have one or two

Style APA, Harvard, Vancouver, ISO itp.

18

Lepokurova, Olesya E., Irina S. Ivanova, Aleksandr N. Pyrayev та Oleg A. Ismagulov. "Distribution of stable Н, О and С isotopes in natural waters in the area of the Taz oil and gas condensate field (Yamalo-Nenets autonomous region)". Bulletin of the Tomsk Polytechnic University Geo Assets Engineering 335, № 2 (2024): 157–69. http://dx.doi.org/10.18799/24131830/2024/2/4466.

Pełny tekst źródła

Streszczenie:

Relevance. The study of isotopic composition of water and dissolved substances makes it possible to determine not only their genesis, but also the fractionation processes occurring in the “water–rock–gas–organic matter” system over time, i. e. as different stages of the evolution of water composition pass through. Interest in the groundwater of the Arctic regions of Western Siberia is additionally associated with the widespread occurrence of oil deposits at the depths of formation waters and the possible influence of cryogenic metamorphization processes on composition of near-surface waters. A

Style APA, Harvard, Vancouver, ISO itp.

19

Menoud, Malika, Carina van der Veen, Dave Lowry, et al. "New contributions of measurements in Europe to the global inventory of the stable isotopic composition of methane." Earth System Science Data 14, no. 9 (2022): 4365–86. http://dx.doi.org/10.5194/essd-14-4365-2022.

Pełny tekst źródła

Streszczenie:

Abstract. Recent climate change mitigation strategies rely on the reduction of methane (CH4) emissions. Carbon and hydrogen isotope ratio (δ13CCH4 and δ2HCH4) measurements can be used to distinguish sources and thus to understand the CH4 budget better. The CH4 emission estimates by models are sensitive to the isotopic signatures assigned to each source category, so it is important to provide representative estimates of the different CH4 source isotopic signatures worldwide. We present new measurements of isotope signatures of various, mainly anthropogenic, CH4 sources in Europe, which represen

Style APA, Harvard, Vancouver, ISO itp.

20

Ansdell, Kevin M., and T. Kurtis Kyser. "The geochemistry and fluid history of the Proterozoic Laurel Lake Au–Ag deposit, Flin Flon greenstone belt." Canadian Journal of Earth Sciences 28, no. 2 (1991): 155–71. http://dx.doi.org/10.1139/e91-016.

Pełny tekst źródła

Streszczenie:

The Laurel Lake Au–Ag deposit is situated 25 km southwest of Flin Flon in the Proterozoic Flin Flon Domain and consists of branching quartz–muscovite–pyrite–tennantite–chalcopyrite–sphalerite–galena–electrum–carbonate veins (stage 1) surrounded by a widespread zone of sericitized and pyritized Amisk Group felsic volcanic rocks. The deposit has been deformed and metamorphosed during the Hudsonian orogeny and is crosscut by nonauriferous quartz–dolomite–tourmaline–pyrite veins (stage 2). The timing of mineralization, the lack of obvious relation to a major shear zone, and high base metal sulphid

Style APA, Harvard, Vancouver, ISO itp.

21

Novikov, Dmitry A., Aleksandr N. Pyrayev, Anastasia A. Maksimova, Fedor F. Dultsev та Anatoly V. Chernykh. "Evolution of the composition of Н, О and C stable isotopes in the groundwaters of oil and gas bearing sediments in the northern regions of West Siberia". Georesursy 25, № 4 (2023): 219–32. http://dx.doi.org/10.18599/grs.2023.4.16.

Pełny tekst źródła

Streszczenie:

The results of a study of the isotopic composition of oxygen and hydrogen of groundwater and dissolved inorganic carbon in oil and gas deposits of the northern regions of Western Siberia, covering a wide stratigraphic range – Mesozoic and Paleozoic are presented. The obtained values are very diverse, covering the intervals from –120 to –50‰ (δD) and from –17 to –2‰ (δ18O). Such a variable isotopic composition of waters indicates the absence of a unified mechanism for the accumulation of waters and their transformation during the geological evolution of the West Siberian sedimentary basin. The

Style APA, Harvard, Vancouver, ISO itp.

22

Boutard, D., and W. Möller. "Isotopic effects in a–C:(H/D) films deposited from methane/hydrogen RF plasmas." Journal of Materials Research 5, no. 11 (1990): 2451–55. http://dx.doi.org/10.1557/jmr.1990.2451.

Pełny tekst źródła

Streszczenie:

Hard amorphous hydrocarbon films have been deposited by RF glow discharges in methane/hydrogen mixtures with different hydrogen isotopes. For CH4 + D2 and CD4 + H2 gas mixtures, the film growth rate, the density, the refractive index, and the isotopic hydrogen content are obtained as functions of the process gas composition. Further, the hydrogen loss induced by 15 keV helium ions is studied. The results are qualitatively interpreted in terms of different effects of ion bombardment during film deposition which influence the properties of the resulting films.

Style APA, Harvard, Vancouver, ISO itp.

23

Valentini, R., T. Anfodillo та J. R. Ehleringer. "Water sources and carbon isotope composition (δ13C) of selected tree species of the Italian Alps". Canadian Journal of Forest Research 24, № 8 (1994): 1575–78. http://dx.doi.org/10.1139/x94-205.

Pełny tekst źródła

Streszczenie:

Selected species of the Italian Alpine region (Piceaabies (L.) Karst., Pinussylvestris L., Pinuscembra L., and Larixdecidua L.) have been investigated in terms of water-source utilization and carbon fixation estimated by the analysis of hydrogen and carbon stable isotopes composition at two sites of differing altitude (1000 and 1500 m above sea level). Larixdecidua is the species most dependent on groundwater in both sites, while Pinussylvestris utilizes rainwater to a greater extent. Concurrently, Pinussylvestris displayed the highest value of the carbon isotopic ratio (δ13C = −25.9 ± 0.6‰),

Style APA, Harvard, Vancouver, ISO itp.

24

Oganesyants, Lev, Elena Sevostianova, Elena Kuzmina, Mikhail Ganin, Eugene Chebykin, and Aleksandr Suturin. "Isotopic and Chemical Composition of the Deep Water of Lake Baikal." Food Processing: Techniques and Technology 51, no. 4 (2022): 723–32. http://dx.doi.org/10.21603/2074-9414-2021-4-723-732.

Pełny tekst źródła

Streszczenie:

Introduction. Due to its natural composition, the deep water of Lake Baikal can be bottled without any conserving agents. The development of large-scale production of bottled Baikal water requires its detailed study in order to protect it from counterfeit and falsification. The purpose of this work was to study the isotopic and chemical composition of the deep water of Lake Baikal and offer indicators for its identification. Study objects and methods. The research included deep water of Lake Baikal, sampled at various points, the water from the Angara River, and the tap water from the ci

Style APA, Harvard, Vancouver, ISO itp.

25

Gropp, Jonathan, Markus Bill, Daniel Stolper, and Dipti Nayak. "Studying the isotopic composition of microbial methane with a genetically-tractable methanogen." ARPHA Conference Abstracts 6 (October 17, 2023): e108567. https://doi.org/10.3897/aca.6.e108567.

Pełny tekst źródła

Streszczenie:

Nearly all biogenic methane is produced by a group of microorganisms called methanogenic archaea (or methanogens). Methanogens can use a variety of substrates, such as H<sub>2</sub> + CO<sub>2</sub>, acetate, and methylated compounds, for methanogenesis. Previous studies have shown that the stable carbon and hydrogen isotopic compositions of methane produced by methanogens can vary drastically depending on the substrate composition and concentration in the environment. For instance, the concentration of H<sub>2</sub> in the environment has a substantial impact on the isotopic composition of me

Style APA, Harvard, Vancouver, ISO itp.

26

Dar, Shaakir Shabir, Prosenjit Ghosh, Ankit Swaraj, and Anil Kumar. "Craig–Gordon model validation using stable isotope ratios in water vapor over the Southern Ocean." Atmospheric Chemistry and Physics 20, no. 19 (2020): 11435–49. http://dx.doi.org/10.5194/acp-20-11435-2020.

Pełny tekst źródła

Streszczenie:

Abstract. The stable oxygen and hydrogen isotopic composition of water vapor over a water body is governed by the isotopic composition of surface water and ambient vapor, exchange and mixing processes at the water–air interface, and the local meteorological conditions. These parameters form inputs to the Craig–Gordon models, used for predicting the isotopic composition of vapor produced from the surface water due to the evaporation process. In this study we present water vapor, surface water isotope ratios and meteorological parameters across latitudinal transects in the Southern Ocean (27.38–

Style APA, Harvard, Vancouver, ISO itp.

27

Bujakaite, M. I., V. Yu Lavrushin, and B. G. Pokrovsky. "Strontium isotopic composition in waters of mud volcanoes of Azerbaijan." Литология и полезные ископаемые, no. 5 (October 20, 2019): 391–403. http://dx.doi.org/10.31857/s0024-497x20195391-403.

Pełny tekst źródła

Streszczenie:

The isotopic composition of strontium was studied in the waters of 22 Azerbaijan mud volcanoes, in which the isotope composition of oxygen and hydrogen, as well as the concentration of macro and micro elements, was previously [Lavrushin et al., 2015] determined. 87Sr/86Sr ratios in the waters of Azerbaijan mud volcanoes are within 0.70670.7083. The minimum ratio was established in Neftechala Yuzhnaya volcano, located in the south of the territory ‒ in the Kura region, which is characterized by the lowest average values of 87Sr/86Sr = 0.70700.0003 and 18O = 2.01.8 compared to volcanoes situated

Style APA, Harvard, Vancouver, ISO itp.

28

Абдуллина, Г. И., Л. Г. Аскинази, А. А. Белокуров та ін. "Определение изотопного состава плазмы по частоте альфвеновских колебаний в токамаке ТУМАН-3М". Письма в журнал технической физики 45, № 15 (2019): 51. http://dx.doi.org/10.21883/pjtf.2019.15.48089.17813.

Pełny tekst źródła

Streszczenie:

The possibility of determination of evolution of the plasma isotope composition from Alfven oscillation frequency in discharges with pulsed deuterium puffing into hydrogen plasma and hydrogen into deuterium plasma in ohmically heated plasma in TUMAN-3M tokamak is discussed. Isotopic ratio found from the Alfven oscillation spectra by this method is relative concentrations of hydrogen nH/(nH+nD) or deuterium nD/(nH+nD) in the mixed hydrogen-deuterium plasma. These values were found to agree qualitatively with the results of optical spectroscopy measurements and with neutral particle analysis dat

Style APA, Harvard, Vancouver, ISO itp.

29

Guo, Rong, Shengjie Wang, Mingjun Zhang, et al. "Stable Hydrogen and Oxygen Isotope Characteristics of Bottled Water in China: A Consideration of Water Source." Water 11, no. 5 (2019): 1065. http://dx.doi.org/10.3390/w11051065.

Pełny tekst źródła

Streszczenie:

The origin of bottled water can be identified via its stable isotope signature because of the spatial variation of the stable isotope composition of natural waters. In this paper, the spatial pattern of δ2H and δ18O values were analyzed for a total of 242 bottled water samples produced at 137 sites across China that were randomly purchased during 2014–2015. The isotopic ratios of bottled water vary between −166‰ and −19‰ for δ2H, and between −21.6‰ and −2.1‰ for δ18O. Based on multiple regression analyses using meteorological and geographical parameters, an isoscape of Chinese bottled water wa

Style APA, Harvard, Vancouver, ISO itp.

30

Davies, Lauren J., Ryan C. McKellar, Karlis Muehlenbachs, and Alexander P. Wolfe. "Isotopic characterization of organic matter from the Danek Bonebed (Edmonton, Alberta, Canada) with special reference to amber." Canadian Journal of Earth Sciences 51, no. 11 (2014): 1017–22. http://dx.doi.org/10.1139/cjes-2014-0057.

Pełny tekst źródła

Streszczenie:

During the course of excavating the Maastrichtian Danek Bonebed in the city of Edmonton, a range of well-preserved organic materials was recovered alongside vertebrate remains, including amber, coal, and unpermineralized plant fragments. Herein, we report carbon and hydrogen stable isotopic characterizations of these materials to provide ancillary insights into genesis of the fossil deposit. These analyses permit isotopic comparisons between the various organic fractions at the Danek locality, as well as with other Late Cretaceous localities in Alberta. The investigation of amber proves partic

Style APA, Harvard, Vancouver, ISO itp.

31

Borodulina, Galina, Igor Tokarev, and Evgeny Yakovlev. "Isotope Composition of Natural Water in Lake Onega Basin." Water 15, no. 10 (2023): 1855. http://dx.doi.org/10.3390/w15101855.

Pełny tekst źródła

Streszczenie:

In 2009–2018, the isotopic composition of oxygen and hydrogen in the atmospheric precipitation, groundwater and river and lake water of Lake Onega basin was studied. The weighted annual isotope composition of precipitation at Petrozavodsk was δ18O = −11.7‰ and δ2H = −84‰ and varied from −30.9 to −4.1‰ for δ18O and from −23 to −22‰ for δ2H. The isotopic composition of the water in Lake Onega was relatively uniform from −11.5 to −9.3‰ for δ18O and from −85 to −71‰ for δ2H. In the bays, the isotopic composition of the water varied more substantially than in the central part of the lake due to the

Style APA, Harvard, Vancouver, ISO itp.

32

Korotkova, T. G. "Parameters of the UNIQUAC model for describing the vapor-liquid phase equilibrium of D<sub>2</sub>-T<sub>2</sub>, D<sub>2</sub>-DT, DT-T<sub>2</sub> hydrogen isotope mixtures." Fine Chemical Technologies 17, no. 6 (2023): 459–72. http://dx.doi.org/10.32362/2410-6593-2022-17-6-459-472.

Pełny tekst źródła

Streszczenie:

Objectives. Determination of the parameters of the binary energy interaction of the (UNIversal QUAsiChemical) UNIQUAC model on the basis of mathematical processing of experimental literature data on the phase equilibrium of hydrogen isotopic mixtures D2-T2, D2-DT, DT-T2 to calculate the activity coefficients of the components D2, DT, and T2.Methods. The method of successive approximations was used in junction with the “from stage to stage” method, which consists in calculating a single evaporation process on a theoretical plate.Results. Equations were written for calculating the activity coeff

Style APA, Harvard, Vancouver, ISO itp.

33

Rapti, Dimitra, Giovanni Martinelli, Guodong Zheng, and Clelia Vincenzi. "Bottled Mineral Waters as Unconventional Sampling in Hydro-Geological Research." Water 15, no. 19 (2023): 3466. http://dx.doi.org/10.3390/w15193466.

Pełny tekst źródła

Streszczenie:

Bottled mineral waters originate from groundwater aquifers, their chemical composition being initially determined by geochemical water-rock interaction processes. The waters used for bottling originate from different parts of the hydrological cycle and have a unique hydro-geochemical fingerprint. As water moves through the water cycle, the isotopic composition of oxygen and hydrogen in the water molecule may change. Determining 18O and 2H can help to characterize the source of bottled water and the natural conditions of the parent water body, of the recharge area, and the influence of various

Style APA, Harvard, Vancouver, ISO itp.

34

Vasil'chuk, Yurij Kirillovich, Alexander Pavlovich Ginzburg, Igor' Vladimirovich Tokarev, et al. "Stable isotopes of oxygen and hydrogen in frost blisters of the Chara River valley, Transbaikalia." Арктика и Антарктика, no. 2 (February 2024): 90–129. http://dx.doi.org/10.7256/2453-8922.2024.2.70706.

Pełny tekst źródła

Streszczenie:

The study's focus is on the distribution of oxygen and hydrogen isotopes in the ice cores of frost blisters in the Chara River valley, Transbaikalia. The Kodar and Udokan mountain ranges surround the Chara Depression. Cryogenic (frosty) heaving is common in high humidity areas with loamy, clay, and peaty sediments. In summer 2023, the authors described two seasonal frost blisters in swampy, forested depressions on the periphery of the Charsky Sands (in the so-called thermosuffusion funnels). Oxygen and hydrogen isotopic compositions of oxygen (&#948;18O) and hydrogen (&#948;2H) in blis

Style APA, Harvard, Vancouver, ISO itp.

35

Barbeta, Adrià, Sam P. Jones, Laura Clavé, et al. "Unexplained hydrogen isotope offsets complicate the identification and quantification of tree water sources in a riparian forest." Hydrology and Earth System Sciences 23, no. 4 (2019): 2129–46. http://dx.doi.org/10.5194/hess-23-2129-2019.

Pełny tekst źródła

Streszczenie:

Abstract. We investigated plant water sources of an emblematic refugial population of Fagus sylvatica (L.) in the Ciron river gorges in south-western France using stable water isotopes. It is generally assumed that no isotopic fractionation occurs during root water uptake, so that the isotopic composition of xylem water effectively reflects that of source water. However, this assumption has been called into question by recent studies that found that, at least at some dates during the growing season, plant water did not reflect any mixture of the potential water sources. In this context, highly

Style APA, Harvard, Vancouver, ISO itp.

36

Walter, S., A. Kock, T. Steinhoff, et al. "Isotopic evidence for biogenic molecular hydrogen production in the Atlantic Ocean." Biogeosciences 13, no. 1 (2016): 323–40. http://dx.doi.org/10.5194/bg-13-323-2016.

Pełny tekst źródła

Streszczenie:

Abstract. Oceans are a net source of molecular hydrogen (H2) to the atmosphere. The production of marine H2 is assumed to be mainly biological by N2 fixation, but photochemical pathways are also discussed. We present measurements of mole fraction and isotopic composition of dissolved and atmospheric H2 from the southern and northern Atlantic between 2008 and 2010. In total almost 400 samples were taken during 5 cruises along a transect between Punta Arenas (Chile) and Bremerhaven (Germany), as well as at the coast of Mauritania.The isotopic source signatures of dissolved H2 extracted from surf

Style APA, Harvard, Vancouver, ISO itp.

37

Walter, S., A. Kock, T. Steinhoff, et al. "Isotopic evidence for biogenic molecular hydrogen production in the Atlantic Ocean." Biogeosciences Discussions 12, no. 19 (2015): 16431–77. http://dx.doi.org/10.5194/bgd-12-16431-2015.

Pełny tekst źródła

Streszczenie:

Abstract. Oceans are a net source of molecular hydrogen (H2) to the atmosphere. The production of marine H2 is assumed to be mainly biological by N2 fixation, but photochemical pathways are also discussed. We present measurements of mole fraction and isotopic composition of dissolved and atmospheric H2 from the southern and northern Atlantic between 2008 and 2010. In total almost 400 samples were taken during five cruises along a transect between Punta Arenas (Chile) and Bremerhaven (Germany), as well as at the coast of Mauretania. The isotopic source signatures of dissolved H2 extracted from

Style APA, Harvard, Vancouver, ISO itp.

38

Wommack, Elizabeth A., Lisa C. Marrack, Stefania Mambelli, Joshua M. Hull, and Todd E. Dawson. "Using oxygen and hydrogen stable isotopes to track the migratory movement of Sharp-shinned Hawks (Accipiter striatus) along Western Flyways of North America." PLOS ONE 15, no. 11 (2020): e0226318. http://dx.doi.org/10.1371/journal.pone.0226318.

Pełny tekst źródła

Streszczenie:

The large-scale patterns of movement for the Sharp-shinned Hawk (Accipiter striatus), a small forest hawk found throughout western North America, are largely unknown. However, based on field observations we set out to test the hypothesis that juvenile migratory A. striatus caught along two distinct migration routes on opposite sides of the Sierra Nevada Mountains of North America (Pacific Coast and Intermountain Migratory Flyways) come from geographically different natal populations. We applied stable isotope analysis of hydrogen (H) and oxygen (O) of feathers, and large scale models of spatia

Style APA, Harvard, Vancouver, ISO itp.

39

Muller, Catherine L., Andy Baker, Ian J. Fairchild, Chris Kidd, and Ian Boomer. "Intra-Event Trends in Stable Isotopes: Exploring Midlatitude Precipitation Using a Vertically Pointing Micro Rain Radar." Journal of Hydrometeorology 16, no. 1 (2015): 194–213. http://dx.doi.org/10.1175/jhm-d-14-0038.1.

Pełny tekst źródła

Streszczenie:

Abstract Annual, monthly, and daily analyses of stable isotopes in precipitation are commonly made worldwide, yet only a few studies have explored the variations occurring on short time scales within individual precipitation events, particularly at midlatitude locations. This study examines hydrogen isotope data from sequential, intra-event samples from 16 precipitation events during different seasons and a range of synoptic conditions over an 18-month period in Birmingham, United Kingdom. Precipitation events were observed simultaneously using a vertically pointing micro rain radar (MRR), whi

Style APA, Harvard, Vancouver, ISO itp.

40

Bonal, L., C. M. O’D Alexander, G. R. Huss, K. Nagashima, E. Quirico, and P. Beck. "Hydrogen isotopic composition of the water in CR chondrites." Geochimica et Cosmochimica Acta 106 (April 2013): 111–33. http://dx.doi.org/10.1016/j.gca.2012.12.009.

Pełny tekst źródła

Style APA, Harvard, Vancouver, ISO itp.

41

Chernov, I. P., N. N. Nikitenkov, L. N. Puchkareva, Yu R. Kolobov, M. Kröning, and H. Baumbach. "Changes in isotopic composition of metals enriched in hydrogen." Russian Physics Journal 42, no. 4 (1999): 427–30. http://dx.doi.org/10.1007/bf02509681.

Pełny tekst źródła

Style APA, Harvard, Vancouver, ISO itp.

42

Piani, Laurette, Kazuhide Nagashima, Noriyuki Kawasaki, et al. "Hydrogen Isotopic Composition of Hydrous Minerals in Asteroid Ryugu." Astrophysical Journal Letters 946, no. 2 (2023): L43. http://dx.doi.org/10.3847/2041-8213/acc393.

Pełny tekst źródła

Streszczenie:

Abstract Rock fragments of the Cb-type asteroid Ryugu returned to Earth by the JAXA Hayabusa2 mission share mineralogical, chemical, and isotopic properties with the Ivuna-type (CI) carbonaceous chondrites. Similar to CI chondrites, these fragments underwent extensive aqueous alteration and consist predominantly of hydrous minerals likely formed in the presence of liquid water on the Ryugu parent asteroid. Here we present an in situ analytical survey performed by secondary ion mass spectrometry from which we have estimated the D/H ratio of Ryugu’s hydrous minerals, D/HRyugu, to be [165 ± 19] ×

Style APA, Harvard, Vancouver, ISO itp.

43

FERRON, FRANCISCO ADOLFO, RONALDO TORMA BERNARDO, and JEFFERSON CARDIA SIMÕES. "Isótopos Estáveis e Química Iônica da Cobertura Glacial da Ilha do Rei George (Shetlands do Sul, Antártica) como Indicadores de Parâmetros Ambientais." Pesquisas em Geociências 28, no. 2 (2001): 343. http://dx.doi.org/10.22456/1807-9806.20308.

Pełny tekst źródła

Streszczenie:

Hydrogen and oxygen stable isotopes and anionic concentration (sulphates, chlorides and nitrates) in snow and ice from King George Island are presented. Isotopic and chemical composition are preserved in the uppermost part of the ice cap (first meters) providing informations about some environmental parameters as the origin of precipitation and particles (impurities) e its distribution, atmospheric circulation and the physics processes occurring in the ice pack.

Style APA, Harvard, Vancouver, ISO itp.

44

Burke, Roger A. "Possible influence of hydrogen concentration on microbial methane stable hydrogen isotopic composition." Chemosphere 26, no. 1-4 (1993): 55–67. http://dx.doi.org/10.1016/0045-6535(93)90412-x.

Pełny tekst źródła

Style APA, Harvard, Vancouver, ISO itp.

45

Yang, Kunhua, Guilin Han, Man Liu, Xiaoqiang Li, Jinke Liu, and Qian Zhang. "Spatial and Seasonal Variation of O and H Isotopes in the Jiulong River, Southeast China." Water 10, no. 11 (2018): 1677. http://dx.doi.org/10.3390/w10111677.

Pełny tekst źródła

Streszczenie:

The stable isotope technique of oxygen and hydrogen (δ18O and δ2H) and deuterium excess (d-excess) was used to investigate distribution characteristics in June 2017 and January 2018 in the Jiulong River, southeast China. The results revealed that (1) seasonal isotopic composition was mainly controlled by precipitation. It enriched lighter water isotopes in winter more than in summer because of the aggravating effect of low temperature and great rainfall. (2) Spatial distribution of the North, West, and South River showed increasing enrichment of heavy isotopes in that order. In the high-flow s

Style APA, Harvard, Vancouver, ISO itp.

46

Paul, Alexia, Christine Hatté, Lucie Pastor, Yves Thiry, Françoise Siclet, and Jérôme Balesdent. "Hydrogen dynamics in soil organic matter as determined by <sup>13</sup>C and <sup>2</sup>H labeling experiments." Biogeosciences 13, no. 24 (2016): 6587–98. http://dx.doi.org/10.5194/bg-13-6587-2016.

Pełny tekst źródła

Streszczenie:

Abstract. Understanding hydrogen dynamics in soil organic matter is important to predict the fate of 3H in terrestrial environments. One way to determine hydrogen fate and to point out processes is to examine the isotopic signature of the element in soil. However, the non-exchangeable hydrogen isotopic signal in soil is complex and depends on the fate of organic compounds and microbial biosyntheses that incorporate water-derived hydrogen. To decipher this complex system and to understand the close link between hydrogen and carbon cycles, we followed labeled hydrogen and labeled carbon througho

Style APA, Harvard, Vancouver, ISO itp.

47

Xia, Chengcheng, Guodong Liu, Yuchuan Meng, and Ke Chen. "Comparison of Intra-Event Characteristics of Hydrogen and Oxygen Stable Isotopes between Rainfall and Throughfall and the Effects of Pre-Event Precipitation." Forests 14, no. 8 (2023): 1603. http://dx.doi.org/10.3390/f14081603.

Pełny tekst źródła

Streszczenie:

The isotopic composition of precipitation provides valuable information about its source and transportation. However, raindrops interact with vegetation before reaching the earth’s surface, leading to isotopic changes in the infiltrating water. Comparing isotopic composition between rainfall and throughfall helps to understand canopy processes and their impact on isotopic variation. Based on observational data collected during the periods of July 2019, July–August 2020, and July–August 2021 in a planted forest located in the southwest monsoon region of China, this study examines hydrogen and o

Style APA, Harvard, Vancouver, ISO itp.

48

Kamezaki, Kazuki, Takahisa Maeda, Shigeyuki Ishidoya, Ayumi Tsukasaki, Shohei Murayama, and Naoki Kaneyasu. "Low blank sampling method for measurement of the nitrogen isotopic composition of atmospheric NOx." PLOS ONE 19, no. 2 (2024): e0298539. http://dx.doi.org/10.1371/journal.pone.0298539.

Pełny tekst źródła

Streszczenie:

The nitrogen isotopic composition of nitrogen oxide (NOx) is useful for estimating its sources and sinks. Several methods have been developed to convert atmospheric nitric oxide (NO) and/or nitrogen dioxide (NO2) to nitrites and/or nitrates for collection. However, the collection efficiency and blanks are poorly evaluated for many collection methods. Here, we present a method for collecting ambient NOx (NO and NO2 simultaneously) with over 90% efficiency collection of NOx and low blank (approximately 0.5 μM) using a 3 wt% hydrogen peroxide (H2O2) and 0.5 M sodium hydride (NaOH) solution. The 1

Style APA, Harvard, Vancouver, ISO itp.

49

Fedotov, Andrey, Ruslan Gnatovsky, Vadim Blinov, Maria Sakirko, Valentina Domysheva, and Olga Stepanova. "The Current Oxygen and Hydrogen Isotopic Status of Lake Baikal." Water 13, no. 23 (2021): 3476. http://dx.doi.org/10.3390/w13233476.

Pełny tekst źródła

Streszczenie:

This study revises the δ18O and δ2H status of Lake Baikal. The mean values of δ18O and δ2H varied from −15.9 to −15.5‰ and from −123.2 to 122.2‰, respectively, for the past 30 yr. The isotopic composition of the lake remained more ‘‘light” compared to the regional precipitation and rivers inflows. The isotopic composition of the lake has begun to change since ca.1920 after the Little Ice Age; however, Lake Baikal still has not reached the isotopically steady state in the present. The calculated composition of the steady-state should be −12.3‰ for δ18O and −103.6‰ for δ2H. If regional climate p

Style APA, Harvard, Vancouver, ISO itp.

50

Zagnitko, V., and V. Mykhailov. "Ukraine's shale bearing strata gas: geochemical features." Visnyk of Taras Shevchenko National University of Kyiv. Geology, no. 1 (64) (2014): 11–18. http://dx.doi.org/10.17721/1728-2713.64.02.11-18.

Pełny tekst źródła

Streszczenie:

Relevance of research is caused by the need to expand the mineral and resource base of fuel and energy resources in Ukraine. The increasing demand for oil and natural gas, depletion of traditional deposits and rising prices cause the considerable interest in the search for hydrocarbon deposits of unconventional type, therefore the interest in studying of various aspects of oil and gas potential of shale strata of Ukraine is growing every year. An important argument in the development of search criteria and evaluation of unconventional hydrocarbon deposits is the study of their component compos

Style APA, Harvard, Vancouver, ISO itp.

Oferujemy zniżki na wszystkie plany premium dla autorów, których prace zostały uwzględnione w tematycznych zestawieniach literatury. Skontaktuj się z nami, aby uzyskać unikalny kod promocyjny!