Results 31 to 40 of about 23,223 (131)

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

Observation of Topological Chirality Switching Induced Freezing of a Skyrmion Crystal

Advanced Materials, EarlyView.
Using Lorentz Transmission electron microscopy, it is shown that in the insulating van der Waals ferromagnet, CrBr3, a magnetic field can cause Bloch skyrmionic bubbles to spontaneously switch their chirality. As achiral type‐II bubbles are an intermediate state, the bubbles rapidly elongate and shrink when switching, thereby inducing a freezing of the
John Fullerton, Yue Li, Harshvardhan Solanki, Sergey Grebenchuk, Magdalena Grzeszczyk, Zhaolong Chen, Makars Šiškins, Kostya S. Novoselov, Maciej Koperski, Elton J. G. Santos, Charudatta Phatak   +10 more
wiley   +1 more source

Pore characteristics and formation mechanism of high-maturity organic-rich shale in Lower Cambrian Jiumenchong Formation, southern Guizhou

Petroleum Research, 2018
In order to investigate pore characteristics and formation mechanism in the high-maturity organic-rich shale of Lower Cambrian Jiumenchong Formation in southern Guizhou, the pore structure, pore type and storage properties are well studied through the ...
Zhongbao Liu, Bo Gao, Zongquan Hu, Wei Du, Haikuan Nie, Tao Jiang   +5 more
doaj   +1 more source

The Spectral Types of White Dwarfs in Messier 4

, 2009
We present the spectra of 24 white dwarfs in the direction of the globular cluster Messier 4 obtained with the Keck/LRIS and Gemini/GMOS spectrographs.
Bergeron, D. Saul Davis, David R. Reitzel, Davis, Dotter, Eisenstein, Eisenstein, Frinchaboy, Harvey B. Richer, Jason S. Kalirai, Kalirai, Kalirai, Kalirai, Lanz, Lin, Press, R. Michael Rich, Richer, Richer, Strickler, Williams, Williams   +21 more
core   +1 more source

Ultrafast Biodiesel Synthesis via K2CO3‐Supported Mg‐Al Hydrotalcite Catalyst With Tailored Basicity and Mesoporous Structure

Asia-Pacific Journal of Chemical Engineering, EarlyView.
ABSTRACT With the increasing global energy demand and the growing prominence of environmental issues, biodiesel has garnered significant attention as a renewable, low‐emission green energy source. Conventional hydrotalcite‐based catalysts often suffer from insufficient basicity and limited accessibility of active sites, leading to relatively long ...
Jingdi Zheng, Kefan Wang, Chunhui Wang, Xiang Li, Ying Tang   +4 more
wiley   +1 more source

Chemical and Noble Gas Isotope Compositions of Formation Gases from a 3 km Deep Scientific Borehole in the Koyna Seismogenic Zone, Western India

Geofluids, 2019
A 3 km deep research borehole KFD1 was drilled in the Koyna reservoir-triggered seismicity region, Western India, between December 2016 and May 2017.
Nagaraju Podugu, Satrughna Mishra, Thomas Wiersberg, Sukanta Roy   +3 more
doaj   +1 more source

The Star Formation Law in Nearby Galaxies on Sub-Kpc Scales

, 2008
(Abridged) We present a comprehensive analysis of the relationship between star formation rate surface density (SFR SD) and gas surface density (gas SD) at sub-kpc resolution in a sample of 18 nearby galaxies.
Bigiel, Frank, Brinks, Elias, de Blok, W. J. G., Leroy, Adam, Madore, Barry, Thornley, Michele D., Walter, Fabian   +6 more
core   +1 more source

The cooling rate of neutron stars after thermonuclear shell flashes [PDF]

, 2013
Thermonuclear shell flashes on neutron stars are detected as bright X-ray bursts. Traditionally, their decay is modeled with an exponential function. However, this is not what theory predicts.
A. Cumming, Bradt, Clauset, Cumming, Cumming, Cumming, Fisker, Fujimoto, Galloway, Gudmundsson, Hanawa, Heger, in ’t Zand, in ’t Zand, J. J. M. in ’t Zand, Jahoda, Lampton, Lewin, Linares, London, Madej, Mitsuda, Morrison, Parmar, R. A. D. A. Mateijsen, Strohmayer, Suleimanov, T. Bagnoli, T. L. Triemstra, Wallace, Woosley, Worpel   +31 more
core   +1 more source

Origins of the Pangkaimen Au Deposit in the Northern Great Xing'an Range, China: Evidence From Geochronological, Geochemical, Fluid Inclusion, and H–O–S–Pb Isotope Data

Geological Journal, EarlyView.
The Pangkaimen Au–Ag deposits belong to the epithermal Au deposits, which are of great significance for guiding the research and development of this type of gold deposit. Metallogenic model diagram of Pangkaimen Au–Ag deposit. ABSTRACT The gold (Au) metallogenic belt in the northern Great Xing'an Range is characterised by the wide occurrence of the ...
Sheng Lu, Hongpeng Chen, Chenglu Li, Ye Wang, Tiesheng Li, Rigen Wu, Zengtao Li, Zhichao Song, Xiannan Zhu   +8 more
wiley   +1 more source

Geochemical characteristics, origin and main controlling factors of helium gas accumulation of helium-bearing natural gas in Sulige Gas Field, Ordos Basin, China

Journal of Natural Gas Geoscience
The Ordos Basin is the largest natural gas producing region in China. Recent discoveries of two helium-rich natural gas fields (Dongsheng and Qingyang) shows promising helium resource potential.
Liyong Fan, Jianshe Wei, Aiping Hu, Yuhong Li, Linze Xie, Tao Jiang, Yuxuan Zhang, Shangwei Ma   +7 more
doaj   +1 more source