نتایج جستجو برای: boron rich mineral

تعداد نتایج: 239662  

رحمانی, فاطمه, مکی‌زاده, محمدعلی, نقره‌ئیان, موسی,

In the eastern part of the Sabzevar ophiolite, southeast of Soleymanieh, there are white to pale greenish veins of diopsidite with 1–15 cm width inside mantle serpentinized harzburgites. The center of these veins is rather homogeneous and includes a monomineralic clinopyroxen with granular texture. The contact between the pure clinopyroxene and its host peridotite is always progressive and char...

2016
Bennett J. Eleazer Mark D. Smith Alexey A. Popov Dmitry V. Peryshkov

The first example of a transition metal (BB)-carboryne complex containing two boron atoms of the icosahedral cage connected to a single exohedral metal center (POBBOP)Ru(CO)2 (POBBOP = 1,7-OP(i-Pr)2-2,6-dehydro-m-carborane) was synthesized by double B-H activation within the strained m-carboranyl pincer framework. Theoretical calculations revealed that the unique three-membered (BB)>Ru metalacy...

2017
Nguyen Xuan Truong Bertram Klaus August Jaeger Sandy Gewinner Wieland Schöllkopf Otto Dopfer

Binary nanoclusters are of great interest for understanding fundamental phenomena related to applied materials science. Herein, neutral silicon-rich silicon−boron clusters (SinBm, n = 3−8, m = 1−2) are characterized by means of resonant infrared-ultraviolet two-color ionization (IR-UV2CI) spectroscopy, mass spectrometry, and quantum chemical calculations. Global energy optimizations are employe...

Journal: :geopersia 2015
mehdi reza poursoltani georgia pe-piper

middle jurassic fluvio-deltaic and turbiditic mudstones of the kashafrud formation, are important hydrocarbon sources in the gas-rich kopet-dagh basin, northeast iran. clay mineral assemblages are important for interpretation of sediment provenance and for understanding burial diagenetic cementation in sandstones. the clay mineral assemblages in mudrocks in two areas, saleh-abad and senjedak, w...

2015
Zhiyang Yu Jian Luo Baiou Shi Jiong Zhao Martin P. Harmer Jing Zhu

Aberration corrected high angle annular dark field scanning transmission electron microscopy (HAADF-STEM) was employed to study the distribution of barium atoms on the surfaces and in the interiors of boron carbide based nanowires. Barium based dopants, which were used to control the crystal growth, adsorbed to the surfaces of the boron-rich crystals in the form of nanometer-thick surficial fil...

2000
C. H. WEI K. C. ZENG J. Y. LIN H. X. JIANG D. N. BRASKI

BxGa1–xN films were deposited on 6H-SiC (0001) substrates at 1000°C by low pressure MOVPE using diborane, trimethylgallium, and ammonia as precursors. The presence of boron was detected by Auger scanning microprobe, the shift of the (00.2) x-ray diffraction peak, and low-temperature photoluminescence. A single-phase BxGa1–xN alloy with x = 1.5% was produced at the gas phase B/Ga ratio of 0.005....

Journal: :Polymer Chemistry 2021

A new methacrylic boronate ester is synthesized and exploited to produce biocompatible nanoparticles with a boron-rich core by PISA.

Journal: :Anti-cancer agents in medicinal chemistry 2010
Romulus I Scorei Radu Popa

In the last few years boron (B) compounds became increasingly frequent in the chemotherapy of some forms of cancer with high malignancy and of inoperable cancers. As more B-based therapy chemicals are developed it is necessary to review the correlation between B and the incidence of different forms of cancer, the biochemical and molecular mechanisms influenced by B and to explore the relevance ...

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