Showing papers by "Birla Institute of Technology, Mesra published in 1982"

Performance study of thermosyphonic circulation solar water heaters using packed bed collectors

Abstract: In the present investigation the performance behaviour of thermosyphonic circulation solar water heaters using packed bed collectors has been analysed. Iron chips, gravels and stones have been used as packing materials. Average tank water temperature, collector as well as system efficiency and mony pay-back for these packed bed solar water heaters are compared with those for solar water heater using a plane collector. Experimental results reveal that the performance of solar water heater improves appreciably by packing its collector with packing material. Among the packed-bed solar water heaters tested the iron chips packed-bed solar water heater gives the overall best performance.

Chemical Investigations of the Sapindus mukorossi Seed Oil

Abstract: Two lipid fractions ‘A’ and ‘B’ were isolated from Sapindus mukorossi seed oil by preparative TLC. Fraction ‘A’ (70.4%, Rf value 0.76) is a normal triglyceride and its fatty acid compositions was determined by GLC. Fraction ‘B’ (29.6%, Rf value 0.51) shows the presence of nitrogenous constituents. It develops a reddish brown colour in contact with alkali or alkoxide solution. Percentages of individual acids present in fraction ‘A’ were found to be: palmitic, 5.5; stearic, 3.2; oleic, 64.6; linoleic, 2.9; arachidic, 3.1; eicosenoic, 20.1; minor acids, 0.6. Fraction ‘A’ is composed of 0.1,3.6,29.9 and 66.4 percent trisaturated, monounsaturated-disaturated, diunsaturated-monosaturated and triunsaturated glycerides respectively. On GLC analysis, the percentages of individual acids constituting fraction ‘B’ were found to be:palmitic, 3.8; stearic, 1.5; oleic, 33.6; linoleic, 2.9; arachidic, 11.1; eicosenoic, 30.2; behenic, 2.8; docosenoic, 1.4 and two unidentified acids 7.3 and 5.4. Fraction ‘B’ responded to hydrolysis by pancreatic lipase and the product with polarity equivalent to that of 2-mono-glyceride was isolated by TLC and converted to methyl ester. Percentages of individual acids constituting that methyl esters were found to be:palmitic, 11.8; stearic, 4.1; oleic, 12.8; linoleic, 3.7; arachidic, 8.3; eicosenoic, 10.2; behenic, 6.5; docosenoic, 4.2; and two unidentified acids 22.2 and 16.2. This non-glyceridic component of the S. mukorossi seed oil is a cyanolipid, 1-cyano-2-hydroxymethyl prop-1-ene-3-ol. The structure was confirmed by I. R., N.M.R. and Mass spectral-analysis. Chemische Untersuchungen des Saatols Sapindus mukorossi Zwei Lipidfraktionen ‚A’ und ‚B’ wurden durch praparative DC aus dem Saatol Sapindus mukorossi isoliert. Fraktion ‚A’ (70.4%, Rf-Wert 0.76) ist ein normales Triglycerid. Seine Fettsaure-Zusammensetzung wurde durch GC bestimmt. Fraktion ‚B’ (29.6%, Rf-Wert 0.51) zeigt die Gegenwart von stickstoffhaltigen Bestandteilen. Es entwickelt bei Kontakt mit Alkali oder Alkyloxidlosung eine rotlich braune Farbe. Die prozentualen Anteile in der Fraktion ‚A’ betrugen: Palmitinsaure 5.5%, Stearinsaure 3.2%, Olsaure 64.6%, Linolsaure 2.9%, Arachidonsaure 3.1%, Eicosensaure 20.1%, andere Sauren 0.6%, Fraktion ‚A’ ist aus jeweils 0.1,3.6,29.9 und 66.4% dreifachgesattigten, einfachungesattigt-zweifachgesattigten, zweifachungesattigt-einfachgesattigten und dreifachungesattigten Glyceriden zusammengesetzt. Durch GC-Analyse wurde der prozentuale Anteil der einzelnen Sauren, aus denen Fraktion ‚B’ besteht, wie folgt ermittelt: Palmitinsaure 3.8%, Stearinsaure 1.5%, Olsaure 33.6%, Linolsaure 2.9%, Arachidonsaure 11.1%, Eicosensaure 30.2%, Behensaure 2.8%, Docosensaure 1.4% und zwei unidentifizierte Sauren 7.3% und 5.4%, Fraktion ‚B’ reagiert auf Hydrolyse durch Pankreaslipase. Das Produkt mit einer gleichen Polaritat wie 2-Mono-glycerid wurde durch DC isoliert und zum Methylester umgewandelt. Die prozentualen Anteile der diesen Methylestern zugrundeliegenden Sauren betrugen: Palmitinsaure 11.8%, Stearinsaure 4.1%, Olsaure 12.8%, Linolsaure 3.7%, Arachidonsaure 8.3%, Eicosensaure 10.2%, Behensaure 6.5%, Docosensaure 4.2% und zwei unidentifizierte Sauren 22.2% und 16.2% Dieser nichtglyceridische Bestandteil von S. mukorossi Saatol ist ein Cyanolipid, 1-Cyano-2-hydroxymethylprop-1-en-3-ol. Die Struktur wurde durch IR, NMR und Massenspektroskopie bestatigt.

Excitation spectrum and structure factor for interacting bosons

Abstract: Lennard-Jones, Gaussian and square well potentials have been used to obtain Ek and the structure factor S(k) using the reaction matrix formalism. The results obtained for Ek and S(k) for different potentials have been compared with each other and also with the experimental results. It is found that the Gaussian potential gives better results. The structure factor S(k) has been calculated using Berdahl's relation for S(k). The shape of S(k) differs markedly from the one obtained using a polynomial expression for S(k). However, the value obtained for the velocity of sound using a square well potential agrees very well with the experimental value.