Results 21 to 30 of about 23,086 (153)

Feasibility of high-helium natural gas exploration in the Presinian strata, Sichuan Basin

Natural Gas Industry B, 2015
Helium in China highly depends on import at present, so the most practical way to change the situation is searching for medium-to-large natural gas fields with high helium content.
Jian Zhang, Wei Yang, Haiyong Yi, Wuren Xie, Zengye Xie, Fuying Zeng, Yongjing Cen   +6 more
doaj   +1 more source

On the Role of Dissolved Gases in the Atmosphere Retention of Low-Mass Low-Density Planets [PDF]

, 2018
Low-mass low-density planets discovered by Kepler in the super-Earth mass regime typically have large radii for their inferred masses, implying the presence of H$_2$-He atmospheres.
Chachan, Yayaati, Stevenson, David J.
core   +3 more sources

Helium resources accumulation regulations and their development prospects in China

Journal of Natural Gas Geoscience
Helium is a globally scarce strategic resource that is relevant to national economies and the development of high-tech industries, and China primarily depends on imported helium for its industrial applications.
Jian Li, Xiaobo Wang, Zhusong Xu, Huiying Cui, Xiaomei Wang, Bin Zhang, Jianying Guo, Shizhen Tao, Jianfa Chen, Zengye Xie, Jixian Tian, Yifeng Wang   +11 more
doaj   +1 more source

Lithofacies types and assemblage features of continental shale strata and their implications for shale gas exploration: A case study of the Middle and Lower Jurassic strata in the Sichuan Basin

Natural Gas Industry B, 2020
Fine identification and division of lithofacies types of continental shale strata is an important basis for the evaluation of shale gas exploration and development potential.
Zhongbao Liu, Guangxiang Liu, Zongquan Hu, Dongjun Feng, Tong Zhu, Ruikang Bian, Tao Jiang, Zhiguang Jin   +7 more
doaj   +1 more source

The accretion-diffusion scenario for metals in cool white dwarfs

, 2006
We calculated diffusion timescales for Ca, Mg, Fe in hydrogen atmosphere white dwarfs with temperatures between 5000 and 25000 K. With these timescales we determined accretion rates for a sample of 38 DAZ white dwarfs from the recent studies of Zuckerman
Aannestad, Alcock, Becklin, Berger, Bondi, Bondi, Chayer, D. Koester, D. Wilken, Dupuis, Dupuis, Dupuis, Farihi, Fontaine, Jura, Kilic, Koester, Lehner, Linsky, Livio, McCook, Muchmore, Muchmore, Paquette, Paquette, Reach, Redfield, Redfield, Redfield, Redfield, Ruffert, Ruffert, Schatzman, Sfeir, Tassoul, Welsh, Welsh, Zuckerman, Zuckerman   +38 more
core   +2 more sources

On the origin of nitrogen at low metallicity

, 2021
Understanding the evolution of the N/O ratio in the interstellar medium (ISM) of galaxies is essential if we are to complete our picture of the chemical evolution of galaxies at high redshift, since most observational calibrations of O/H implicitly ...
Dopita, Michael A., Heger, Alexander, Kewley, Lisa J., Krumholz, Mark R., Roy, Arpita, Sutherland, Ralph S.   +5 more
core   +2 more sources

Tracer Applications of Noble Gas Radionuclides in the Geosciences

, 2013
The noble gas radionuclides, including 81Kr (half-life = 229,000 yr), 85Kr (11 yr), and 39Ar (269 yr), possess nearly ideal chemical and physical properties for studies of earth and environmental processes.
Fischer, T. P., Kennedy, B. M., Lu, Z. -T., Purtschert, R., Schlosser, P., Severinghaus, J. P., Smethie Jr., W. M., Solomon, D. K., Sturchio, N. C., Tanhua, T., Yokochi, R.   +10 more
core   +3 more sources

Laboratory rotational ground state transitions of NH$_3$D$^+$ and CF$^+$ [PDF]

, 2016
Aims. This paper reports accurate laboratory frequencies of the rotational ground state transitions of two astronomically relevant molecular ions, NH3D+ and CF+. Methods. Spectra in the millimeter-wave band were recorded by the method of rotational state-
Brünken, Sandra, Kluge, Lars, Schlemmer, Stephan, Stoffels, Alexander   +3 more
core   +2 more sources

Volatiles in protoplanetary disks [PDF]

, 2014
Volatiles are compounds with low sublimation temperatures, and they make up most of the condensible mass in typical planet-forming environments. They consist of relatively small, often hydrogenated, molecules based on the abundant elements carbon ...
Bergin, Edwin A., Brittain, Sean, Marty, Bernard, Mousis, Olvier, Oberg, Karin L., Pontoppidan, Klaus M., Salyk, Colette   +6 more
core   +2 more sources

Origin and migration model of natural gas in L gas field, eastern slope of Yinggehai Sag, China

Petroleum Exploration and Development, 2019
Based on the chemical and stable carbon isotopic composition of natural gas and light hydrocarbons, along with regional geological data, the genetic type, origin and migration of natural gases in the L lithologic gas field, the eastern slope of Yinggehai
Jihai YANG, Baojia HUANG
doaj   +1 more source