Results 21 to 30 of about 266,445 (225)
Yankuang ceshi, 2017 The content of the same element in separate rare polymetallic ore processing samples is different, and the content of each element in the same sample is also different. For example, the content of niobium, tantalum, lithium, and beryllium in tailings and
LI Zhi-wei +4 more
doaj +1 more source
Chemistry – An Asian Journal, 2019 AbstractReactions of the beryllium dihalide complexes [BeX2(OEt2)2] (X=Br or I) with N,N,N′,N′‐tetramethylethylenediamine (TMEDA), a series of diazabutadienes, or bis(diphenylphosphino)methylene (DPPM) have yielded the chelated complexes, [BeX2(TMEDA)], [BeX2{(RN=CH)2}] (R=tBu, mesityl (Mes), 2,6‐diethylphenyl (Dep) or 2,6‐diisopropylphenyl (Dip)), and
Albert Paparo, Cameron Jones
openaire +3 more sources
Systemic trade-risk of critical resources [PDF]
, 2015 In the wake of the 2008 financial crisis the role of strongly interconnected markets in fostering systemic instability has been increasingly acknowledged.
Klimek, Peter +2 more
core +2 more sources
Microstructure and chemical composition of Roman orichalcum coins emitted after the monetary reform of Augustus (23 B.C.) [PDF]
, 2019 A collection of ancient Roman orichalcum coins, i.e., a copper-zinc alloy, minted under the reigns from Caesar to Domitianus, have been characterised using scanning electron microscopy (SEM-EDS) and electron microprobe analysis (EMPA).
Catalli F. +3 more
core +1 more source
Chemical enrichment of substandard beryllium concentrates
Engineering Sciences, 2023 Global trends in the use of beryllium in the creation of high-tech products dictate the need to create beryllium production in Russia. The prerequisites for this are the availability of a raw material base and competencies in the field of technology for ...
Valentine V. Menshikov +2 more
semanticscholar +1 more source
Extraction of Beryllium Oxide from Beryl Ore.
The Journal of the Society of Chemical Industry, Japan, 1961 ケイフッ化ソーダ法により緑柱石中の酸化ベリリウムを高収率,高純度で疏解分離する方法について,ケイフッ化ソーダの添加量,焼成温度,焼成時間等について検討した。その結果,緑柱石微粉末と等量のケイフッ化ソーダを加え,850℃で2時間焼成した場合が最もよい条件であることがわかった。その場合のSiO2含有量は3%以下で,93～95%の比較的純度の高いBeOを90～93%の収率で得た。更に塩化ナトリウムを第二のフラックスとして若干加えることにより,有効かつ有毒なフッ素分は完全に回収され,ケイフッ化ソーダ添加量を0.75倍量に節約でき,SiO2量が2%以下の純度の高い酸化ベリリウムを94%の収率で得た。
Katsuzo KIDA, Susumu NISHIGAKI
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Multi-scale investigation of uranium attenuation by arsenic at an abandoned uranium mine, South Terras [PDF]
, 2017 Detailed mineralogical analysis of soils from the UK’s historical key uranium mine, South Terras, was performed to elucidate the mechanisms of uranium degradation and migration in the 86 years since abandonment. Soils were sampled from the surface (0 – 2
AJ Locock +24 more
core +2 more sources
Литосфера, 2018 The article is devoted to studies the rare element composition of albite-spodumene pegmatites of the lithium with associated Be, Nb, Ta Kolmozero deposit.
Lyudmila N. Morozova
doaj +1 more source
Solar cell radiation response near the interface of different atomic number materials [PDF]
, 1972 The response of cobalt 60 irradiated N/P silicon solar cells was measured as a function of the atomic number of the medium adjacent to the cell and the direction of the gamma ray beam.
Burke, E. A. +3 more
core +1 more source
Movement Disorders Clinical Practice, EarlyView.Abstract Background Continuous subcutaneous apomorphine infusion (CSAI) is effective in Parkinson's disease but has not been evaluated in multiple system atrophy (MSA). Objective To assess the 6‐month efficacy and tolerability of CSAI in MSA patients. Methods French multicenter retrospective registry‐based analysis of CSAI use in MSA.
Simon Lamy +16 more
wiley +1 more source