4H silicon carbide (4H-SiC) holds great promise for high-power and high-frequency electronics, in which high-quality 4H-SiC wafers with both global local planarization are cornerstones. Chemical–mechanical polishing (CMP) is the key processing technology of wafers. Enhancing performance CMP critical to improving surface quality reducing cost In this review, superior properties introduced. The d...

The p-type doping efficiency of 4H silicon carbide (4H-SiC) is rather low due to the large ionization energies dopants. Such an issue impedes exploration full advantage 4H-SiC for semiconductor devices. In this letter, we show that co-doping group-IVB elements effectively decreases energy most widely used dopant, i. e., aluminum (Al), through Coulomb repulsion between levels and Al in 4H-SiC. A...

Abstract: 5,5 ′ -Methylenebis(4–phenyl-4H -1,2,4-triazole-3-thiol) (2) was synthesized starting from hydrazinecarbothioamide compound (1). Treatment of compound 2 with ethyl bromoacetate produced diethyl 5,5 ′ -{methylenebis[(4phenyl-4H -1,2,4-triazole-5,3-diyl)thio]}diacetate (3), which was converted to the corresponding diacetohydrazide derivative (4) by treatment with hydrazine hydrate. The ...

Recently, energy saving is strongly required to prevent global warming. Electricity is the most common energy form and is necessary in our daily life and various activities, because it is comparatively easy to utilize in transmission and conversion after generation. Therefore, it is very important to reduce energy loss in electric power systems and improve their efficiency. The present power sy...

In the title chromone-tethered benzohydrazide derivative, C18H14N2O3, the 4H-chromen-4-one and the -CH=N-NH-CO- units are each essentially planar, with the largest deviations from thei planes being 0.052 (2) and 0.003 (2) Å, respectively. The dihedral angles between the 4H-chromen-4-one and the -CH=N-NH-CO- units, the 4H-chromen-4-one unit and the benzene ring of the 4-tolyl group, and the benz...

Purpose: To study the effects on the water, electrolyte, and acid-base balances in rabbits submitted to antegrade enema with different solutions through appendicostomy. Methods: Forty male New Zealand rabbits were submitted to appendicostomy, and distributed in 4 groups, according to the antegrade enema solution: PEG group, polyethylene glycol electrolyte solution (n=10); ISS group, isotonic sa...

BACKGROUND The derivatives of 2-substituted 4H-3,1-benzoxazin-4-one belong to a significant category of heterocyclic compounds, which have shown a wide spectrum of medical and industrial applications. RESULTS A new and effective one-pot method for the synthesis of 2-substituted 4H-3,1-benzoxazin-4-one derivatives is described in this paper. By using the iminium cation from a mixture of cyanur...

Glaciecola sp. strain 4H-3-7+YE-5 was isolated from subseafloor sediments at Suruga Bay in Japan and is capable of efficiently hydrolyzing cellulose and xylan. The complete genome sequence of Glaciecola sp. 4H-3-7+YE-5 revealed several genes encoding putatively novel glycoside hydrolases, offering a high potential for plant biomass degradation.