搜索结果: 106-120 共查到“理学 synthesis”相关记录748条 . 查询时间(0.062 秒)
Mesoporous Ba/MCM-41 type materials (Ba/MCM-41) with high Ba/Si molar ratios between 0.025 and 0.1 were synthesized by direct hydrothermal synthesis. The samples were characterized by XRD, nitrogen ad...
Synthesis and surfactant properties of N-acylation compounds derived from hydrolysis degradation products of N-(b-cianoethyl)-e-caprolactam
N-acylation surfactants 4-azasebacic acid N-(b -cianoethyl)-e -caprolactam critical micelle concentration surface tension foaming
2010/12/20
N-acyl amino acids can be used as active surface agents in the detergents industry, as well as in the pharmaceutical industry and cosmetics. Properties of these compounds are superior to those of fatt...
An efficient and green approach for the synthesis of vinyl aryl ethers in the presence of guanidine hydrochloride
Guanidine hydrochloride dialkyl acetylenedicarboxylates vinyl aryl ether O-vinylation water solvent
2010/12/20
A stereoselective procedure for vinyl aryl ether bond formation by direct coupling of dialkyl acetylenedicarboxylates and substituted phenols or naphthols under mild reaction conditions has been devel...
Synthesis and antimicrobial activities of some new 1,2,4-triazole derivatives
1,3,4-Thiadiazole 1,2,4-triazole carbamate antimicrobial activity
2010/12/20
The synthesis of ethyl [3-(cyanomethyl)-5-alkyl-4H-1,2,4-triazol- 4-yl]carbamates (2a-d) was performed starting from ethyl 2-[ethoxy(4- (aryl)methylene]hydrazinecarboxylates (1a, 1b).
Study on the Synthesis and Application of THPS-OMMT-MDFP Nanocomposite Flame Retardant
Amino Resin Nano Composite Organ-Montmorillonite THPS
2011/12/14
A new type of amino resin nanocomposite(THPS-OMMT-MDFP) was synthesized from amino resin(MDFP), Tetra-hydroxymethyl phosphonium sulfate(THPS) and Organ-montmorillonite (OMMT)by intercalation compoundi...
Synthesis and Characterization of Attapulgite Clay Coated Ag/AgBr/TiO2 Visible Light Photocatalyst
Ag/AgBr/TiO2 Attapulgite Clay Photocatalytic
2011/11/14
Attapulgite clay coated Ag/AgBr/TiO2 visible light photocatalyst was prepared by an impregnation-deposition-precipitation method. The catalyst was characterized via powder X-ray diffraction (XRD), TEM...
The DRAO Synthesis Telescope in the post-CGPS Era
The DRAO Synthesis Telescope the post-CGPS Era
2011/1/13
The DRAO ST was used for the past 15 years as the primary instrument for the Canadian Galactic Plane Survey. This has been a spectacularly successful project, advancing our understanding of the Milky ...
A new limit on the Ultra-High-Energy Cosmic-Ray flux with the Westerbork Synthesis Radio Telescope
the Ultra-High-Energy Cosmic-Ray flux the Westerbork Synthesis Radio Telescope
2011/1/13
A particle cascade (shower) in a dielectric, for example as initiated by an ultra-high energy cosmic ray, will have an excess of electrons which will emit coherent \v{C}erenkov radiation, known as the...
A series of pH-responsive superabsorbent composites were synthesized by the free-radical grafting copolymerization of natural guar gum (GG), partially neutralized acrylic acid (NaA), and medicinal sto...
Polarised foreground removal at low radio frequencies using rotation measure synthesis: Uncovering the signature of hydrogen reionisation
cosmology observation cosmology theory di use radiation nstrumentation:
2010/11/12
Measurement of redshifted 21-cm emission from neutral hydrogen promises to be the most e ective method for studying the reionisation history of hydrogen and,indirectly, the rst galaxies. These studie...
Synthesis of ErFeAsO-based superconductors by hydrogen doping method
Synthesis ErFeAsO-based superconductors hydrogen doping method
2010/11/25
Here we demonstrate the technique to stabilize the ErFeAsO-based superconductor with the smallest lattice constants in LnFeAsO1-y (Ln = lanthanide) series using hydrogen doping method. Polycrystalline...
A 22-year Southern Sky Survey for Transient and Variable Radio Sources using the Molonglo Observatory Synthesis Telescope
radio continuum: general stars: pulsars:general stars: flare techniques:image processing catalogues supernovae general
2010/11/9
We describe a 22-year survey for variable and transient radio sources, performed with
archival images taken with the Molonglo Observatory Synthesis Telescope (MOST).
This survey covers 2775 deg2 of ...
Effect of various substituents on intramolecular 1,1-vinylboration, synthesis of 1-silacyclobutene derivatives
organoboration silacyclobutenes NMR
2010/12/3
The reaction of 1-boryl-1-alkenyl chlorosilane derivatives with alkynyllithium reagents [Li-C\equiv C-R3 (R3~=~Ph, SiMe3)] at low temperature (--78 °C) affords alkenyl(alkyn-1-yl)silanes. These compou...
Synthesis and crystal structure of a novel multimodal ligand, 6,6'-bis(2-(di(pyridin-2-yl)methylene)-1-methylhydrazinyl)-2,2'-bipyridine, and its copper(I) complex, {[Cu3L2](PF6)3° 3H2O} (1)
dipyridyl ketone metal complexes N-donor ligands
2010/12/3
The single crystal X-ray structure of the novel multimodal ligand 6,6'-bis(2-(di(pyridin-2-yl)methylene)-1-methylhydrazinyl)-2,2'-bipyridine, C34H28N10 (L), was determined at 120 (2) K. The ligand pos...
Synthesis and characterisations of some new 2,4-dihydro-[1,2,4]- triazol-3-one derivatives and X-ray crystal structures of 4-(3-phenylallylideneamino)-5-thiophen-2-yl-methyl-2,4-dihydro-[1,2,4]triazol-3-one
bromo acetophenone X-ray crystallography antimicrobial activity
2010/12/3
Compounds 2 were synthesised via the reaction of 4-amino-5-thiophen-2-yl-methyl-2,4-dihydro-[1,2,4]-triazol-3-one (1) with aldehydes. Compounds 3 and 4 were obtained from compounds 2 with bromo acetop...