Papers by Keyword: Isotope

Abstract: The Dumoga area, which includes the districts of Dumoga, West Dumoga, East Dumoga, Central Dumoga, South-east Dumoga, and North Dumoga in Bolaang Mongondow Regency, North Sulawesi Province, is an agricultural area that relies on groundwater for agricultural irrigation. To ensure the sustainability of the groundwater resources, it is crucial to protect the recharge areas. This study aimed to determine the locations of groundwater recharge areas in the Dumoga region using stable isotopes, specifically oxygen-18 (18O) and deuterium (D). Measurements of groundwater levels (GWL) were conducted to understand the direction and flow of groundwater, while measurements of electrical conductivity (EC) and groundwater temperature served as supporting parameters to assess the groundwater conditions in the research area. The findings revealed that the groundwater in the Dumoga region originates from the surrounding hills, with estimated recharge areas in surronding hills ranging in elevation from 326 meters above sea level (masl) to 462 masl.

Abstract: Possible processes of the carbon isotopes fraction under hydrodynamic caviation at carbon-containing liquids are considered. We have made corresponding experiments with benzene, toluene and ethanol to provide carbon nanoforms with different crystal structures. Specific bonding forces for metals and n-diamond are modeled using developed numerical method. The task is to identify the key parameters affecting the pairs force potentials of carbon atoms and consider the application of the results to microelectronics and natural processes.

Abstract: This paper used the methods of hydrochemical data logging, in-situ titrating , collecting the Source spring samples and the atmospheric samples in the water, by analysis their geochemical characteristics, to distinguish the source of sediment at Huanglong valley in Sichuan. The research shows the gas in the Haunglong Spring water is mainly from deep earth, which contains the inner earth information, instead of atmospheric or biogenic origin. Meanwhile, the research also shows the travertine deposited samples in the deep groove of earth contain a lot of information about the tectonic movements such as earthquakes , volcano activities and so on.

Abstract: The paper studies the processes occurring in low-temperature plasma in the magnetic field. It shows that the laser excitation of molecular oxygen can increase the fraction of singlet pairs formed as a result of collisions between oxygen and carbon molecules. This facilitates the separation of ¹²С and ¹³С isotopes.

Abstract: By the field investigation on BaYinTaohai of WuHai，this article found that ,although this town locates in the northwest arid areas with little rain and big evaporation, the groundwater is abundant. Many artesian wells and springs are founded in this place. Through the analysis of the isotope characteristics of the groundwater in the study area, It is concluded that the shallow groundwater of south Wuhai recharge from local precipitation，while deep confined water recharge from allogenic water with isotope dilution.

Abstract: It is very important to study the groundwater circulation and water chemistry evolution in the management and protection of water pollution. We use the Fluent simulation technology and the isotope tracer method to do simulation on the flow and distribution of groundwater. In the simulation process we set the model of Fluent isotope labeling group, and enter the groundwater flow parameters in the boundary condition, including water viscosity, osmotic pressure, and the average flow velocity. We use isotope tracer method to simulate the water flow. Finally, according to the law of groundwater flow, we predict the evolution rules of groundwater chemical by using the inverse geochemical simulation technology. It provides a theoretical basis for the management and protection of groundwater pollution.

Abstract: On-line system was developed to gauge film thickness using isotope, by which the problem of difficulty in measuring wide film thickness was resolved. Two-point method, determining working curve of gauging system, was introduced, by which time spent on experiment could be decreased, and adaptability of working curve under different condition was improved. After analyzing measuring errors, emendation method for every error source was discussed .Method taking count of pulse number within a period of time was applied, by which measuring precision was improved, so this method can be used widely in other applications .This measuring system has obtained satisfying effect in measuring film thickness, and products can be bought in market .

Abstract: The hydrological cycling of groundwater in Ordos Cretaceous Basin show obvious stratification, the cycle can be divided into three layers by cycling depth, the shallow, the intermediate and the deep. In this paper, a classification standard formed with geochemical and isotopic information is described. The standard is based on a large number of borehole investigation and stratified sampling. In the shallow layer, the groundwater mostly is fresh water with lower amount of total dissolved solids, the dominated anion is HCO₃,tritium and ¹⁴C features show a high or rich properties; in the intermediate layer, the geochemical type of groundwater are SO₄ or SO₄-Cl, the age of groundwater calculated by ¹⁴C is less than 5000a; in the deep groundwater cycling, dominated anion show a complete evolution processes along the flow direction (HCO₃-SO₄-Cl) from recharge to discharge area, the groundwater age is commonly bigger than 5000a and even bigger than 10000a in the discharge area.

Abstract: Molin River catchment is located in arid and semi-arid region in China. River water and groundwater are major water sources in this area. It is a key work to identify the interaction between river water and groundwater for not only water resources assessment and sustainable development, but residents living, industry and agriculture and environment protection. In this study, the interaction of Molin River water and groundwater has been analyzed systematically with hydrogeochemical and isotopic methods based on analyzing the characteristics of groundwater hydrodynamic field. The results show that Molin river water originates from groundwater in river source and is recharged by precipitation and groundwater with different recharge intensity along river flow. From the conclusions, it is obviously that these two parts of water cycle can not be departed, and their interactions need to be considered comprehensively in water resources assessment and development in order to avoid irreversible surface ecological environment damage in Molin River basin

Abstract: Zinc isotopic heterostructured zinc oxide thin films of 64ZnO/68ZnO/64ZnO were synthesized using pulsed laser deposition. The pulsed laser was first irradiated onto a polycrystalline target of 64ZnO to deposit the 64ZnO layer, then onto the 68ZnO target to prepare the 68ZnO layer and finally, the 64ZnO target was used again. The 64ZnO/68ZnO/64ZnO layered thin film was thus obtained. The thin films were annealed at various diffusion annealing temperatures. Diffusion profiles of the zinc isotopes due to the annealing were evaluated using secondary ion mass spectrometry (SIMS). The diffusion coefficients were slightly higher near the interface between the thin film and the substrate (the inner region) compared to the near surface (the outer region).