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See detailEinige Beobachtungen über die Waschwirkung der Seifen
Spring, Walthère ULg

in Zeitschrift für Chemie und Industrie der Kolloide (1909), 4

Spring, W. Zeitschrift fuer Chemie und Industrie der Kolloide (1909), 4, 161-8; SciFinder (Chemical Abstracts Service: Columbus, OH); https://scifinder.cas.org (accessed July 8, 2010). Objections to ... [more ▼]

Spring, W. Zeitschrift fuer Chemie und Industrie der Kolloide (1909), 4, 161-8; SciFinder (Chemical Abstracts Service: Columbus, OH); https://scifinder.cas.org (accessed July 8, 2010). Objections to Chevreuil's, Hillger's, Falk's, and Knapp's theories for the cleansing action of soap are presented. Experiments on the action of soap sols. on carefully purified lampblack bring out the following facts: Lampblack (charged +) hastens the formation of an acid salt (charged -) then forms an adsorption compound with it. A suspension of lampblack in soap sol. will run through filter paper while lampblack can be filtered from water sol. because of an adsorption compound between it and the filter paper. A 1% soap sol. gives an optimum suspension of lampblack, while a 2% is about equivalent to water. Small amounts of alkali increase the suspending power of a sol. greatly. 0.2-0.16% sols. of soap in MeOH, and 0.05% sol. in EtOH show the same optimum suspension for lampblack. The residue of soap obtained by evaporating a given vol. of sol. is the same, whether C has settled through it or not, but the ash in that residue is greater when C has been present, i. e., the basic part is higher in ash than the acid part. From MeOH the ash is less and the C has combined with the basic soap. From EtOH there is practically no difference. The C settled from soap sol. is a thick sirup, and cannot be purified, but forms a colloidal sol. in H2O. C in H2O is uncharged, but in alkaline sol. is + charged. From a 2% soap sol. a white ppt. of C + acid soap collects about the anode, and is lower in ash than soap obtained from the sol. by evaporation. Reprinted with the permission of the American Chemical Society. Copyright © 2010. American Chemical Society (ACS). All Rights Reserved. [less ▲]

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See detailEinige Beobachtungen über die Waschwirkung der Seifen : Dritte Mitteilung
Spring, Walthère ULg

in Zeitschrift für Chemie und Industrie der Kolloide (1910), 6

voir Einige Beobazchtungen über die Waschwirkung der Seifen : Zweite Mitteilung

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See detailEinige Beobachtungen über die Waschwirkung der Seifen : Vierte Mitteilung
Spring, Walthère ULg

in Zeitschrift für Chemie und Industrie der Kolloide (1910), 6

voir Einige Beobazchtungen über die Waschwirkung der Seifen : Zweite Mitteilung

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See detailEinige Beobachtungen über die Waschwirkung der Seifen : Zweite Mitteilung
Spring, Walthère ULg

in Zeitschrift für Chemie und Industrie der Kolloide (1910), 6

Spring, W. Luttich. Z. Chem. Ind. Kolloide (1910), 6, 11-7,109-11,164-8; SciFinder (Chemical Abstracts Service: Columbus, OH); https://scifinder.cas.org (accessed July 8, 2010). Study of the action of ... [more ▼]

Spring, W. Luttich. Z. Chem. Ind. Kolloide (1910), 6, 11-7,109-11,164-8; SciFinder (Chemical Abstracts Service: Columbus, OH); https://scifinder.cas.org (accessed July 8, 2010). Study of the action of hydrated iron oxide, 7Fe2O3.3H2O on soap soln. of varying conc. led to the conclusions that the optimum suspension conc. of the soap soln. is 0.5%, that the soap splits into a basic and acid part, the basic combining with the Fe2O3 and the acid part remaining in soln., and that a soap soln. will remove Fe2O3 from its adsorption compds. with cellulose. Substituting an Fe hydrosol for the Fe2O3 it was found that pptn. occurred between limiting ratios of the soap to hydrosol, i. e., between 1 of soap to 2.16 of Fe2O3 and 1 of soap to 3.47 Fe2O3. The pptn. of Al2O3, with soap soln. shows a periodicity, the ratios of soap to Al2O3 in those solns. which become clear being approx. 8.33, 4.16, 2.06. If the wt. of Al2O3. exceeds that of the soap no pptn. occurs. A large excess of soap, 20 times the wt. of Al2O3, gives a suspension optimum, whereas 80 times the wt. of Al2O3 gives pptn. The speed of the reaction depends primarily on the ratio of the reacting substances. 7SiO2.3H2O combines with a basic constituent of soap, leaving an acid constituent of low ash in soln. The % of ash in the soap in soln. increases when more dil. soap solns. are used, due to soln. of SiO2. The adsorption compd. of basic soap with SiO2 dissociates on shaking with H2O. A pptn. optimum occurs at 1/8% soap soln., and a suspension optimum at 1/16 and 1/2%. A hydrated clay gave approx. the same results, pptg. about 60% of the soap from a 1/2% soln. The soap has a solvent action on the clay, a 1/8% soap soln. giving the highest ratio of suspended clay to soap. A suspension optimum for the settling of clay in soap soln. is found at 1/32% soap soln. Cellulose forms an adsorption compd. with the basic constituents of soap, the cleavage of the soap being noticeable only in concs. above 1%. The cleansing action of soap is due to the formation of an adsorption compd. with the material to be removed, which thus loses its adhesive properties. Reprinted with the permission of the American Chemical Society. Copyright © 2010. American Chemical Society (ACS). All Rights Reserved. [less ▲]

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See detailEinleitung
Brüll, Christoph ULg; Rohrkamp, René

Conference (2013, September 21)

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Viehöver, Vera ULg; Schönborn, Sibylle

in Viehöver, Vera; Schönborn, Sibylle (Eds.) Gellert und die empfindsame Aufklärung : Vermittlungs-, Austausch- und Rezeptionsprozesse in Wissenschaft, Kunst und Kultur. (2009)

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See detailEinleitung
Küpper, Achim ULg

in Gerrekens, Louis (Ed.) Hasard. Der Spieler in der deutschsprachigen Literaturgeschichte (2012)

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See detailEinleitung
Viehöver, Vera ULg; Nörtemann, Regina

in Nörtemann, Regina; Viehöver, Vera (Eds.) Kolmar übersetzen. Studien zum Problem der Lyrikübertragung (2013)

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See detailEinleitung
Pontzen, Alexandra ULg; Konkel, Michael; Theissen, Henning

in Pontzen, Alexandra; Theissen, Henning; Konkel, Michael (Eds.) Die Konstruktion des Jüdischen (2002)

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See detailEinleitung. Zum theatralischen Erzählen um 1900
Küpper, Achim ULg

in Küpper, Achim (Ed.) Theatralisches Erzählen um 1900. Narrative Inszenierungsweisen der Jahrhundertwende (2011)

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See detailEinsatz der quantitativen Ultrasonometrie in der Knochendiagnostik beim Pferd
Carstanjen, B; Lepage, OM; Detilleux, Johann ULg et al

Poster (2002)

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See detailDer Einsatz neuer Medien in der regelungstechnischen Ausbildung
Schumm, P.; Bullinger, Eric ULg; Schweickhardt, T. et al

Poster (2003)

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See detailDer Einsatz neuer Medien in der regelungstechnischen Ausbildung
Schumm, Peter; Bullinger, Eric ULg; Schweickhardt, Tobias et al

in Proceedings of GMA-Kongress (2003)

This paper reviews the use of new media for teaching of control engineering.

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See detailEinstein oscillators in thallium filled antimony skutterudites
Hermann, Raphaël ULg; Jin, R. J.; Schweika, W. et al

in Physical Review Letters (2003), 90(13),

Inelastic neutron scattering measurements on several Tl filled skutterudites (Tl0.5Co3.5Fe0.5Sb12, Tl0.8Co3FeSb12, and Tl0.8Co4Sb11Sn) all show a sharp peak in the vibrational density of states at 57 ... [more ▼]

Inelastic neutron scattering measurements on several Tl filled skutterudites (Tl0.5Co3.5Fe0.5Sb12, Tl0.8Co3FeSb12, and Tl0.8Co4Sb11Sn) all show a sharp peak in the vibrational density of states at 57 +/- 2 K, which is absent in the unfilled skutterudite CoSb3. Heat capacity measurements on Tl0.8Co4Sb11Sn as compared to CoSb3 are consistent with the presence of a localized vibrational mode associated with the "rattling" thallium atoms in this filled skutterudite compound. Both results are well described by a localized Einstein mode model with an Einstein temperature Theta(E) of 53 +/- 1 K. These data provide perhaps the clearest example of local mode behavior in a concentrated metallic system. [less ▲]

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See detailEinstein oscillators that impede thermal transport
Hermann, Raphaël ULg; Grandjean, Fernande ULg; Long, G. J.

in American Journal of Physics (2005), 73(2), 110-118

The Einstein model of a solid usually lacks a clear illustration in introductory solid-state physics courses because most solids are much better described by the Debye model. Filled antimony skutterudites ... [more ▼]

The Einstein model of a solid usually lacks a clear illustration in introductory solid-state physics courses because most solids are much better described by the Debye model. Filled antimony skutterudites, materials that have recently attracted much attention because of their potential for thermoelectric applications, provide a canonical illustration of the Einstein model. The filling atoms are loosely bound in the atomic cage formed by their neighbors, and hence their description as independent harmonic oscillators is adequate. Simple models for the heat capacity and thermal conductivity of a solid are introduced, with emphasis on the density of vibrational states. These models are used in conjunction with experimental results obtained from heat capacity and inelastic neutron scattering measurements to demonstrate the applicability of the concept of the Einstein oscillator to the filling guests in antimony skutterudites. The importance of these Einstein oscillators for impeding thermal transport is discussed and some simple problems involving the heat capacity, thermal conductivity, and inelastic neutron scattering are proposed. (C) 2005 American Association of Physics Teachers. [less ▲]

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See detailEinwirkung von Chlor auf Sulfonverbindungen und organische Oxysulfide
Spring, Walthère ULg; Wissinger, C.

in Berichte der Deutschen Chemischen Gesellschaft (1882), XV

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See detailEinwirkung von Chlor auf Sulfonverbindungen und organische Oxysulfide : Dritte Mitteilung
Spring, Walthère ULg; Wissinger, C.

in Berichte der Deutschen Chemischen Gesellschaft (1884), XVII

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See detailEinwirkung von Chlor auf Sulfonverbindungen und organische Oxysulfide : Zweite Mitteilung
Spring, Walthère ULg; Wissinger, C.

in Berichte der Deutschen Chemischen Gesellschaft (1883), XVI

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See detailEinzigartigkeiten: Pluralrestriktionen im Wörterbuch
Münzberg, Franziska ULg

in Bär, Jochen; Müller, Marcus (Eds.) Geschichte der Sprache – Sprache der Geschichte. Probleme und Perspektiven der historischen Sprachwissenschaft des Deutschen (2012)

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See detailEIT and LASCO Observations of the Initiation of a Coronal Mass Ejection
Dere, K. P.; Brueckner, G. E.; Howard, R. A. et al

in Solar Physics (1997), 175

We present the first observations of the initiation of a coronal mass ejection (CME) seen on the disk of the Sun. Observations with the EIT experiment on SOHO show that the CME began in a small volume and ... [more ▼]

We present the first observations of the initiation of a coronal mass ejection (CME) seen on the disk of the Sun. Observations with the EIT experiment on SOHO show that the CME began in a small volume and was initially associated with slow motions of prominence material and a small brightening at one end of the prominence. Shortly afterward, the prominence was accelerated to about 100 km s[SUP]-1[/SUP] and was preceded by a bright loop-like structure, which surrounded an emission void, that traveled out into the corona at a velocity of 200 400 km s[SUP]-1[/SUP]. These three components, the prominence, the dark void, and the bright loops are typical of CMEs when seen at distance in the corona and here are shown to be present at the earliest stages of the CME. The event was later observed to traverse the LASCO coronagraphs fields of view from 1.1 to 30 Ro. Of particular interest is the fact that this large-scale event, spanning as much as 70 deg in latitude, originated in a volume with dimensions of roughly 35" (2.5 x 10[SUP]4[/SUP] km). Further, a disturbance that propagated across the disk and a chain of activity near the limb may also be associated with this event as well as a considerable degree of activity near the west limb. [less ▲]

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