Zobrazeno 1 - 10
of 32
pro vyhledávání: '"NAND K. NARAIN"'
Autor:
Nand K. Narain
Publikováno v:
Spectroscopy Letters. 10:991-1000
A new sesquiterpene lactone, fasciculide-A, was isolated from the chloroform extract of the leaves of Vernonia fasciculata Michx. The structure of fasciculide-A, 1, is deduced by interpretation of the spectroscopic data.
Autor:
Nand K. Narain
Publikováno v:
Fuel Processing Technology. 11:13-23
Yields of short-contact-time liquefaction product can be increased by pretreating the coal-solvent slurry at below normal liquefaction temperatures to permit solvent incorporation and/or swelling of the coal before liquefaction. An external pretreatm
Publikováno v:
Energy & Fuels. 1:529-534
Etude parametrique de la comminution du charbon par explosion dans de la vapeur. Influence de la temperature (347-506 o ), pression (2400-5000 psig), concentration de la suspension de charbon, et vitesse de chauffe sur la communication et la desulfur
Autor:
Nand K. Narain
Publikováno v:
Spectroscopy Letters. 9:865-875
A rare flavone, Genkwanin, was isolated by column and preparative thin layer chromatography of a chloroform extract of the leaves of Vernonia fasciculata Michx. Spectral studies (NMR, IR, UV and MS) and a comparison with data for closely related comp
Publikováno v:
Fuel Processing Technology. 11:273-287
An investigation was conducted to determine the activities of various coal-liquefaction residua during catalytic hydrotreatment. Residua produced at low- and high-severity coal-liquefaction conditions were employed, as well as a nondeashed residuum p
Publikováno v:
Spectroscopy Letters. 10:639-644
In polar, nonhydrogen-bonding solvents, cocaine's phosphorescence differs from that of its model compound, methyl benzoate, in what can be attributed to an amine-benzoate charge transfer interaction and both compounds exhibit long wavelength bands no
Publikováno v:
Analytical Letters. 13:49-55
A gas chromatography method was used for the analysis of Ethoprop (0-Ethyl-S, S-dipropylphosphorodithioate) in six home garden vegetables. This method is rapid, efficient and does not require any additional clean up, with recoveries ranging from 80
Publikováno v:
Pharmacology. 14:390-396
Seven 1-(naphth-1-ylacetyl)-4-substituted thiosemicarbazides were synthesized and cyclized to the corresponding 2-(naphth-1-ylmethyl)-5-arylamino-1,3,4-oxadiazoles. All compounds, with the exception of two slbstituted oxadiazoles, possessed low anti-
Publikováno v:
Industrial & Engineering Chemistry Research. 26:422-426
The catalysts contained 3 wt % NiO and 19.8 wt % MoO/sub 3/. They were tested in a 50/50 mixture of coal-liquid residuum and process-derived solvent at 390/sup 0/C and 2000 psig in a batch autoclave test. The addition of phosphorus has a significant
Publikováno v:
Journal of Catalysis. 95:406-413
A novel method that can produce large-pore unimodal or bimodal alumina extradates was developed. Since the method used to produce the larger-diameter pores does not involve a steaming or sintering process, the resultant supports have high surface are