References of "1902"
     in
Bookmark and Share    
Full Text
See detailSur les conditions dans lesquelles certains corps prennent la texture schisteuse
Spring, Walthère ULg

in Annales de la Société Géologique de Belgique. Mémoires (1902), XXIX

Annales de la Societe geologique de Belgique; memoires (1902), 29, 49-60, 6(ii), 257-61; SciFinder (Chemical Abstracts Service: Columbus, OH); https://scifinder.cas.org (accessed July 8, 2010). Earlier ... [more ▼]

Annales de la Societe geologique de Belgique; memoires (1902), 29, 49-60, 6(ii), 257-61; SciFinder (Chemical Abstracts Service: Columbus, OH); https://scifinder.cas.org (accessed July 8, 2010). Earlier investigations (Bulletin of the Royal Academy of Bolgique [3] 35. 31-34. 1898) it had resulted in that pressure alone is not sufficient, in order to produce foliation of rocks or solid bodies but that two conditions must be fulfilled: in homogeneity and one-sided pressure. First by the elementary analysis it was proven that the layer surfaces of a black slate are substantially more carbon-rich, as the inner of the layers between them. a sediment made of intermittent layers of clay and humic substances under pressure became a thin petalled mass with a texture of a usual slate. For the formation of transverse foliation, lead sheets covered with fat were used, as well as cubes of the mentioned clay-humus mixture, which were through-pressed by a square steel can with slit ground. In this case the foliation was parallel to the walls of the opening, thus vertical to the direction of the pressure exerted by the pin on the mass. Wet clay, as well as metallic iron also take on a slaty texture by the same treatment. From this experiments author cocludes that slaty texture is not the direct result of pressure, even if this pressure caused a liquefaction or a rearrangement of the mass. The mutual attraction of the pressed particles firstly does not occur in the direction of pressure and finally, if the pressure goes beyond a certain limit, vertical to that one. At hydrostatic pressure at all no change of the direction of attraction of the pressed particles takes place. The conditions for the slaty texture of a substance are inhomogeneous pressure in all directions and lack of homogeneity, and it is unimportant, whereby they are fulfilled. Reprinted with the permission of the American Chemical Society. Copyright © 2010. American Chemical Society (ACS). All Rights Reserved. [less ▲]

Detailed reference viewed: 11 (0 ULg)
Full Text
See detailSur la cause de la direction du clivage des phyllades et des schistes
Spring, Walthère ULg

in Bulletin de la Classe des Sciences. Académie Royale de Belgique (1902), (2), 150-154

Detailed reference viewed: 7 (0 ULg)
Full Text
See detailSur la transparence des milieux troubles aux rayons X
Spring, Walthère ULg

in Bulletin de la Classe des Sciences. Académie Royale de Belgique (1902), (12), 938-943

Detailed reference viewed: 6 (1 ULg)
Full Text
See detailLe bleu du ciel
Spring, Walthère ULg

Speech (1902)

Detailed reference viewed: 7 (1 ULg)
Full Text
See detailRecherches expérimentales sur la filtration et la pénétration de l'eau dans le sable et le limon
Spring, Walthère ULg

in Annales de la Société Géologique de Belgique (1902), XXXIX

Spring, W. Annales de la Societe; geologique de Belgique; Memoires (1902), 29, 17-48; SciFinder (Chemical Abstracts Service: Columbus, OH); https://scifinder.cas.org (accessed July 8, 2010). In the ... [more ▼]

Spring, W. Annales de la Societe; geologique de Belgique; Memoires (1902), 29, 17-48; SciFinder (Chemical Abstracts Service: Columbus, OH); https://scifinder.cas.org (accessed July 8, 2010). In the experiments iron hydroxide was removed from sand by HCl by, subsequently the sand was boiled off with water and under water filled into 2 cm wide glass tubes. The tubes were sealed by an bored-through stopper provided at the lower, rear end a thin wire gauze and eventually a thin cotton wool plug, and the outflow tube pushed into the same leads into a container with water under constant pressure; the other tube end was provided with an inlet tube, which was also connected also to a water container under constant pressure. During off-time of the experiments the tubes were sealed air-proof. Both the tubes and the container intended for the in-take of the water flowed through were placed beside each other and were subjected thus in same way to the by the way almost constant temperature. An indispensable condition for the success of the experiments is the uniform grain size of the sand, which by the way may be put into the tubes only by small amounts. The substantial results of these investigations touching different hydrologic and soil science controversial issues are the subsequent: 1. The velocity of water circulating in horizontal direction in a sand does is not in reverse relation to the thickness of the filter and in straight relation to the applied pressure. In thick filter columns the pressure effect decreases more and more, and the movement of the water is only based on the imbibition. The effect even of a very strong pressure stops after short extending, and the water flows, as if no pressure was applied, therefore a pressure locally applied on a sand layer does not propagate on a considerable distance. 2. With the filtration in vertical direction according results are obtained only for same particle size of the sand; since this condition in nature is hardly fulfilled, no generally valid mathematical formula can be set up for this circulation. Under influence of the water movement in vertical direction the fine parts of the sand move upward, so that the water passage is hindered here and a to a certain extent an automatic rational filter is formed. 3. The resistance of the filter exerted on the passed water decreases apparently proportional to the filter thickness, the POISEUILLE law is only valid for thin filters. 4. If the water percolating the sand filter contains air, so it sticks at the sand grains on certain positions and hinders to a high degree the descending of the water. 5. The runoff from a vertically placed filter decreases only proportional to the thickness at the point, when the pressure reached a certain intensity. If this pressure is only weak, then the filtrate quantity increases with the filter thickness, because then the weight of the water column makes an effect. From this the conclusion is to be drawn that the seepage water quantities supplied to a groundwater stream are not pressed down by any means by the thickness of the layer to be percolated. 6. The volume of the water moistening the sand predominates the volume of the voids of the sand grains in apparent contact the more, the finer the sand is. The free space between the sand grains influnces therefore enormously the mobility of the sand impregnated with water (swimming sand). 7. Temperature increase accelerates the action of a filter due to the reduction of the inner friction of the filter fluid, however for a doubling of the filtrate quantity a rise in temperature to almost 30° is required. 8. The loess loam from the Hesbaye is still permeable for water at a thickness of 8 m (and probably still further). The same applies to clay, as long as he does not stand under pressure, thus it can be unhinderedly expanding correspondingly to the infiltration. 10. From all that it follows that the down flow of the meteoric water cannot take place regularly through the soil in parallel layers. Flowing on into the depth takes place only in limited space, because of the soil air which has to be displaced, since channels must remain for escaping air. Here the water penetrates only if the surface is sprinkled or covered by a rather high water layer or by melting snow, respectively. If the water begins to penetrate, then its velocity increases with the height of the water column. Subsequently on the superficial layers a suction effect is then carried out, which stops only then if the flow downward is in equilibrium with the capillary impregnation, and so the movement is downward annihilated. Reprinted with the permission of the American Chemical Society. Copyright © 2010. American Chemical Society (ACS). All Rights Reserved. [less ▲]

Detailed reference viewed: 41 (1 ULg)
See detailNécrologie : Dominique Keiffer
Kurth, Godefroid ULg

in Revue de l'Instruction Publique en Belgique (1902)

Detailed reference viewed: 14 (4 ULg)
Full Text
See detailDe la nationalité des comtes francs au VIe siècle
Kurth, Godefroid ULg

in Mélanges Paul Fabre : études d'histoire du moyen âge (1902)

Detailed reference viewed: 30 (5 ULg)
Full Text
See detailOraison funèbre de Dominique Keiffer
Kurth, Godefroid ULg

in Revue de l'Instruction Publique en Belgique (1902), XLV

Detailed reference viewed: 14 (0 ULg)
See detailLa Divine Comédie
Kurth, Godefroid ULg

Book published by Bulens (1902)

Detailed reference viewed: 4 (0 ULg)
See detailSaint Boniface
Kurth, Godefroid ULg

Book published by Lecoffre (1902)

Detailed reference viewed: 37 (16 ULg)
See detailNote bibliographique sur le tome II du Catalogue des manuscrits de la Bibliothèque royale par le R. P. Van den Gheyn
Kurth, Godefroid ULg

in Bulletin de la Classe des Lettres et des Sciences Morales et Politiques (1902)

Detailed reference viewed: 5 (0 ULg)
See detailLes humanités de demain
Kurth, Godefroid ULg

in Bulletin de la Classe des Lettres et des Sciences Morales et Politiques (1902)

Detailed reference viewed: 3 (0 ULg)
Full Text
See detailLa reproduction des animaux et la continuité de la vie
Van Beneden, Édouard ULg

in Bulletin de la Classe des Sciences. Académie Royale de Belgique (1902)

Detailed reference viewed: 4 (0 ULg)
Full Text
See detailLa machine à vapeur moderne (suite)
Dwelshauvers-Dery, Victor ULg

Speech (1902)

Detailed reference viewed: 17 (1 ULg)
Full Text
See detailCryoscopie des solides de l’organisme. Procédés et résultats
Fredericq, Léon ULg

in Bulletin de l'Académie Royale de Médecine de Belgique (1902), (novembre),

Detailed reference viewed: 6 (0 ULg)
Full Text
See detailSur la concentration moléculaire des solutions d’albumine et de sels
Fredericq, Léon ULg

in Archives de Biologie (1902), XX

Detailed reference viewed: 4 (0 ULg)
Full Text
See detailSur la concentration moléculaire des solutions d’albumine et de sels
Fredericq, Léon ULg

in Bulletin de l'Académie Royale des Sciences, des Lettres et des Beaux-Arts de Belgique. Sciences (1902)

Detailed reference viewed: 5 (0 ULg)
Full Text
See detailSur les variations journalières de la latitude et du méridien dans le système de l'axe instantané
Folie, François ULg

in Bulletin de la Classe des Sciences. Académie Royale de Belgique (1902), 4

The author continues his study of the latitude and meridian variations in the instantaneous axis system and contests his theory refutation by astronomer G.-H. Darwin.

Detailed reference viewed: 2 (0 ULg)
See detailTrente-cinq années de travaux mathématiques et astronomiques : première partie
Folie, François ULg

in Memorie della Pontificia Accademia dei Nuovi Lincei (1902)

Detailed reference viewed: 8 (0 ULg)