Zobrazeno 1 - 10
of 812
pro vyhledávání: '"Zhang Jian-feng"'
Publikováno v:
Zhipu Xuebao, Vol 43, Iss 2, Pp 210-219 (2022)
Carbonate cements formed at different stages in sandstone have different mineral compositions, structural characteristics and carbon and oxygen isotope compositions. Carbon stable isotope compositions in cements can be used to indicate the source of
Externí odkaz:
https://doaj.org/article/5ef84c37862d43c7a3d4aaa286d4ebf0
Publikováno v:
Cailiao gongcheng, Vol 49, Iss 10, Pp 89-95 (2021)
Extra-coarse-grained WC-Co cemented carbides are focused by researchers due to the high wear resistance and toughness, whereas the densification and WC grain tailoring are key factors for obtaining excellent performance. Extra-coarse-grained WC-10Co
Externí odkaz:
https://doaj.org/article/b9674f3cb4f84723927a803b96078c77
Publikováno v:
Yankuang ceshi, Vol 40, Iss 3, Pp 451-459 (2021)
BACKGROUND The measurement of 40Ar content in K-Ar dilution method includes sample melting and releasing gas, gas purification and enrichment, mass spectrometry measurement. With the application of a newly designed double vacuum furnace and gas purif
Externí odkaz:
https://doaj.org/article/51af87915497444cbcfec1cf1c3a9853
Publikováno v:
Yankuang ceshi, Vol 38, Iss 4, Pp 365-372 (2019)
BACKGROUND The oxygen isotopic composition of sulfate radical in mineral or water can be used to identify the source and transformation process. At present, the common method is to convert sulfate radical into barium sulfate and the oxygen isotopic c
Externí odkaz:
https://doaj.org/article/7ba22c18774d4c7aa67f28bc0429c290
Autor:
ZHANG Jian-feng, LIU Han-bin, SHI Xiao, JIN Gui-shan, LI Jun-jie, ZHANG Jia, HAN Juan, GUO Dong-qiao, ZHONG Fang-wen
Publikováno v:
Yankuang ceshi, Vol 38, Iss 1, Pp 45-54 (2019)
BACKGROUND Reagent purification, sample pretreatment, environmental humidity, reactor cleanliness and experimental quality control are the main influence factors for determination of oxygen isotopic composition of silicates and oxide minerals by BrF5
Externí odkaz:
https://doaj.org/article/e3abd0febdfa460191eb316eb961f8d1
Publikováno v:
Cailiao gongcheng, Vol 46, Iss 7, Pp 144-150 (2018)
Two-dimensional Ti3C2 was obtained by etching Ti3AlC2 in hydrofluoric acid(HF) for different time. The phase composition and morphology of the as-obtained samples were characterized by X-ray diffraction patterns(XRD), scanning electron microscopy (SE
Externí odkaz:
https://doaj.org/article/6b20d364c298437c9b68a0ca48b52080
Autor:
Fan, Zhen, Zhang, Jian-Feng, Zhan, Bo, Lv, Dingshun, Jiang, Xing-Yu, Normand, Bruce, Xiang, Tao
Publikováno v:
Phys. Rev. B 110, 024514 (2024)
The discovery of superconductivity at 80 K under high pressure in La$_3$Ni$_2$O$_7$ presents the groundbreaking confirmation that high-$T_c$ superconductivity is a property of strongly correlated materials beyond cuprates. We use density functional t
Externí odkaz:
http://arxiv.org/abs/2312.17064
Publikováno v:
Yankuang ceshi, Vol 35, Iss 3, Pp 229-235 (2016)
Accurate measurement of Argon isotopes is the premise of Ar-Ar dating with high precision. Two main kinds of instruments for Ar isotope measurement are Single-collector and Multi-collector Mass Spectrometers, among which the Multi-collector Noble Gas
Externí odkaz:
https://doaj.org/article/0ea074ee27e94d52aacea93c02f88596
Publikováno v:
Cailiao gongcheng, Vol 44, Iss 6, Pp 117-122 (2016)
Carbon nanotubes-alumina (CNTs-Al2O3) porous composite with high porosity and excellent compressive strength was prepared by ice-template technique. Effects of different CNT concentrations on microstructure and properties of the composite were invest
Externí odkaz:
https://doaj.org/article/6f65f68f60e94a819331f36aa4541bfa
Publikováno v:
Science China-Physics, Mechanics & Astronomy 67, 287411 (2024)
The infinite-layer cuprate $A$CuO$_2$ ($A=$ Ca, Sr, Ba) has the simplest crystal structure among numerous cuprate superconductors and can serve a prototypical system to explore the unconventional superconductivity. Based on the first-principles elect
Externí odkaz:
http://arxiv.org/abs/2306.09669