Results 11 to 20 of about 6,087,560 (207)

Self-similar collapse of collisional gas in an expanding Universe [PDF]

Mon.Not.Roy.Astron.Soc.319:797,2000, 2000
Similarity solutions are found for the adiabatic collapse of density perturbations $\delta M/M \propto r^{-s}$ $(s>0)$ in a flat universe containing collisional gas only. The solutions are obtained for planar, cylindrical, and spherical perturbations with zero initial pressure.
Abadi, Bardeen, Benson, Bertschinger, Bertschinger, Bi, Cole, Croft, Dekel, Fabian, Fillmore, Gnedin, Gunn, Hoffman, Kaiser, Kauffmann, Kauffmann, Navarro, Nusser, Nusser, Nusser, Petitjean, Somerville, Theuns, Zel'Dovich   +24 more
arxiv   +5 more sources

Multi--Pressure Polytropes as Models for the Structure and Stability of Molecular Clouds. I. Theory [PDF]

, 1999
Molecular clouds are supported by thermal pressure, magnetic pressure, and turbulent pressure. Each of these can be modeled with a polytropic equation of state, so that overall the total pressure is the sum of the individual components. We model the turbulent pressure as being due to a superposition of Alfven waves.
Antonov V. A., Bonazzola S., Bonnor W. B., Boss A. P., Cernicharo J., Chieze J. P., Christopher F. McKee, Ebert R., Falgarone E., Falgarone E., John H. Holliman II, Larson R. B., Larson R. B., Lynden-Bell D., Mestel L., Mestel L., Penston M. V., Umemura M., Viala Y., Yabushita S.   +19 more
arxiv   +4 more sources

Spectroscopy Study on NV Sensors in Diamond-based High-pressure Devices [PDF]

Phys. Rev. Appl. 19, 044091 (2023), 2023
Recently, the negatively charged nitrogen-vacancy (NV) center has emerged as a robust and versatile quantum sensor in pressurized environments. There are two popular ways to implement NV sensing in a diamond anvil cell (DAC), which is a conventional workhorse in the high-pressure community: create implanted NV centers (INVs) at the diamond anvil tip or
arxiv   +1 more source

Phase transition mechanism and bandgap engineering of Sb2S3 at gigapascal pressures

Communications Chemistry, 2021
Antimonite (Sb2S3) has potential applications for solar energy, but how its layered structure changes under pressure is incompletely understood. Here diamond anvil cell experiments supported by first principles calculations offer a structural explanation
Zhongxun Cui, Kejun Bu, Yukai Zhuang, Mary-Ellen Donnelly, Dongzhou Zhang, Philip Dalladay-Simpson, Ross T. Howie, Jiandong Zhang, Xujie Lü, Qingyang Hu   +9 more
doaj   +1 more source

Nested order-disorder framework containing a crystalline matrix with self-filled amorphous-like innards

Nature Communications, 2022
The synthesis and characterization of new crystalline-amorphous hybrid materials is challenging. Here, the authors report the preparation of a nested order-disorder framework by applying high pressure to a nested copper chalcogenide Cu12Sb4S13.
Kejun Bu, Qingyang Hu, Xiaohuan Qi, Dong Wang, Songhao Guo, Hui Luo, Tianquan Lin, Xiaofeng Guo, Qiaoshi Zeng, Yang Ding, Fuqiang Huang, Wenge Yang, Ho-Kwang Mao, Xujie Lü   +13 more
doaj   +1 more source

Quantum sensing with diamond NV centers under megabar pressures [PDF]

Chinese Physics Letters 39, 117601 (2022), 2022
Megabar pressures are of crucial importance for cutting-edge studies of condensed matter physics and geophysics. With the development of diamond anvil cell, laboratory studies of high pressure have entered the megabar era for decades. However, it is still challenging to implement in-situ magnetic sensing under ultrahigh pressures.
arxiv   +1 more source

Enhancing reversibility of LiNi0.5Mn1.5O4 by regulating surface oxygen deficiency

Carbon Energy, 2023
Oxygen deficiency has crucial effects on the crystal structure and electrochemical performance of spinel oxide lithium electrode materials such as LiNi0.5Mn1.5O4 (LNMO) cathode.
Dandan Wang, Cong Gao, Xuefeng Zhou, Shang Peng, Mingxue Tang, Yonggang Wang, Lujun Huang, Wenge Yang, Xiang Gao   +8 more
doaj   +1 more source

Probing local pressure environment in anvil cells with nitrogen vacancy (NV-) centers in diamond [PDF]

Phys. Rev. Applied 13, 024041 (2020), 2020
Important discoveries have frequently been made through the studies of matter under high pressure. The conditions of the pressure environment are important for the interpretation of the experimental results. Due to various restrictions inside the pressure cell, detailed information relevant to the pressure environment, such as the pressure distribution,
arxiv   +1 more source

Discovery of the Baijifeng impact structure in Tonghua, Jilin, China

Matter and Radiation at Extremes, 2023
An impact structure 1400 m in diameter, formed by a bolide impact, has been discovered on Baijifeng Mountain in Tonghua City in Northeast China’s Jilin province. The impact structure takes the form of a cirque-shaped depression on the top of the mountain
Ming Chen, Yang Lu, Jiahao Ning, Wenge Yang, Jinfu Shu, Ho-kwang Mao   +5 more
doaj   +1 more source

Formation of an Al‐Rich Niccolite‐Type Silica in Subducted Oceanic Crust: Implications for Water Transport to the Deep Lower Mantle

Geophysical Research Letters, 2022
Subducted oceanic crust is enriched in free silica. Although being one of the silica polymorphs at lower‐mantle pressures, niccolite‐type phase (Nt‐phase) has not been documented in multicomponent metabasaltic or metasediment compositions relevant to ...
Lu Liu, Hongsheng Yuan, Yao Yao, Ziqiang Yang, Federico Aiace Gorelli, Nico Giordano, Lixin He, Eiji Ohtani, Li Zhang   +8 more
doaj   +1 more source