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See detailComment Philippe II travaillait
Kurth, Godefroid ULg

in Mélanges Paul Frédéricq : hommage de la société pour le progrès des études philologiques et historiques (1904)

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See detailSur la décomposition de quelques sulfates acides à la suite d'une déformation mécanique
Spring, Walthère ULg

in Bulletin de la Classe des Sciences. Académie Royale de Belgique (1904), (5), 290-309

Spring, W. Bulletin de la Classe des Sciences, Academie Royale de Belgique (1904), 1904, 290-309; SciFinder (Chemical Abstracts Service: Columbus, OH); https://scifinder.cas.org (accessed July 8, 2010 ... [more ▼]

Spring, W. Bulletin de la Classe des Sciences, Academie Royale de Belgique (1904), 1904, 290-309; SciFinder (Chemical Abstracts Service: Columbus, OH); https://scifinder.cas.org (accessed July 8, 2010). There after earlier investigations of the authors, (see page 776), perhaps strong compression the same effect as increased temperature on firm body exercises, then it was to be assumed that crystal water-containing salts and acid salts will or less disintegrate with intensive mechanical deformation into their components. For examination the acid sulfates of the alkali metals were selected, with which, as the subsequent compilation shows, which is smaller molecular volume than the sum of the volumes of the developing decomposition products, which decomposition is connected with volume increase. Salt, Density, Molecular volumes. (* determined by the author). Li2SO4, 2.228 *, 2LiHSO4 = 98.1. LiHSO4, 2.123 *, Li2SO4 +. H2SO4 = 102.3. Na2SO4, 2.655, 2NaHSO4 = 98.6. NaHSO4, 2.435 with 13° *, Na2SO4 +. H2SO4 = 106.4. K2SO4 , 2.670, 2KHSO4 = 118. KHSO4, 2.302 with 13° * K2SO4 +. H2SO4 = 118.1. Rb2SO43.596 with 16° *, RbHSO4 = 125.8. RbHSO4, 2.892 with 16° *, Rb2SO4 +. H2SO4 = 126.9. Cs2SO44.250 with 16° * ,2CsHSO4 = 136.6. CsHSO4, 3.352 with 16° *, Cs2SO4 +. H2SO4 = 137.7. Since it not actually concerns around production of a simple hydrostatic pressure, but the effect of a pressing with deformation, the salts in a steel cylinder were pressed together, which possessed an opening, which permitted a "flow through" of the examined substance in the ground; Rise in temperature was completely impossible. The received results are the following. LiHSO4 separates due to pressing into an effluent acid-richer component (approximately 9LiHSO4•2H2SO4) and a part staying, which approaches the composition of the neutral salt. With that salts LiHSO4•H2O continues to go the decay still, whereby the water partly flows. With NaHSO4 no clear flow with occurring cleavage could be observed, on the other hand a clear cleavage occurs, in the discharge of a large quantity crystal water with different hydrates of the acid sulfate, in particular at somewhat increased temperature and a considerable quantity expresses H2SO4; at low temperature first water is separated. The salt 5NaHSO4• H2SO4• 7H2O develops with 40° liquid approximately the composition NaHSO4 has acid, the mass staying; with 80° the decomposition continues to go still, as a small quantity of Na2SO4 develops. The acid sulfates the pressing with 100°, applied by potassium, rubidium, cesium decomposing with; not; hereby it stands in the agreement that these salts are resistant in relation to the effect of the heat. In further experiments a mixture of NaHSO4 with different basic oxides : PbO, CuO, HgO, Ag2O, strong pressure suspended. In completely closed cylinder, without which possibility of flow stepped, like the continuous coloring showed no reaction . If against it the pressure with a mechanical deformation is accompanied (small opening in the ground), takes place a reaction up to complete neutralization of the H2SO4 contained in the acid sulfate; the same effect reached by simple grating, whereby CuO white CuSO4Na2• SO4• H2O gives. From the observations it follows except the analogy between heat effect and pressing still that so-called molecular compounds/connections are less resistant opposite the deformation than atomic compounds/connections. An explanation of the features follows from the conception that pressing causes a change of the molecular condition in the sense of a "pseudo fusion". These procedures have a great importance probably on geological of areas (ground pressure). Reprinted with the permission of the American Chemical Society. Copyright © 2010. American Chemical Society (ACS). All Rights Reserved. [less ▲]

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See detailSur la décomposition de quelques sulfates acides à la suite d'une déformation mécanique
Spring, Walthère ULg

in Recueil des Travaux Chimiques des Pays-Bas et de la Belgique (1904), XXIII

Spring, W. Recueil des Travaux Chimiques des Pays-Bas (1904), 23, 187-201; SciFinder (Chemical Abstracts Service: Columbus, OH); https://scifinder.cas.org (accessed July 8, 2010). A series of experiments ... [more ▼]

Spring, W. Recueil des Travaux Chimiques des Pays-Bas (1904), 23, 187-201; SciFinder (Chemical Abstracts Service: Columbus, OH); https://scifinder.cas.org (accessed July 8, 2010). A series of experiments on anhydrous and hydrated sulfates of the alkali metals was conducted to study the decomposition of some acid sulfates as the result of mechanical deformation. The compression was effected in a steel cylinder, the bottom of which was perforated with a single small hole to permit liquid to flow away and provided with a loosely-fitting piston between which and the walls of the cylinder the salt could "flow". Results demonstrate that under compression involving mechanical deformation, compounds which may be regarded as resulting from the combination of a solid with a liquid tend to decompose into these generators. Reprinted with the permission of the American Chemical Society. Copyright © 2010. American Chemical Society (ACS). All Rights Reserved. [less ▲]

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See detailSur la diminution de densité qu'éprouvent certains corps à la suite d'une forte compression et sur la raison probable de ce phénomène
Spring, Walthère ULg

in Recueil des Travaux Chimiques des Pays-Bas et de la Belgique (1904), XXIII

Spring, Walthere. Recueil des Travaux Chimiques des Pays-Bas (1904), 23, 1-15; SciFinder (Chemical Abstracts Service: Columbus, OH); https://scifinder.cas.org (accessed July 8, 2010). In a previous ... [more ▼]

Spring, Walthere. Recueil des Travaux Chimiques des Pays-Bas (1904), 23, 1-15; SciFinder (Chemical Abstracts Service: Columbus, OH); https://scifinder.cas.org (accessed July 8, 2010). In a previous communication (Abstr., 1884, 256), the author has shown that lead, zinc, ammonium sulphate, and ammonium alum, when strongly compressed, exhibit a diminished density. These observations have been extended to various metals by Kahlbaum, Roth and Siedler (Abstr., 1902, ii, 259), and to steel by Grunmach (Ann. Phys. Chem., 1889, 67, 227). It is now shown that specimens of lead, tin, cadmium, and silver which have been forced through small apertures under pressure exhibit slight diminutions from the normal densities of these metals, whereas bismuth, similarly prepared, shows an increase in density. Further, when two plates of the same metal, one having been compressed and the other being the metal in the normal condition, are simultaneously placed in an electrolyte, a slight permanent current is produced, in one direction with the first four metals, which expand on liquefaction, and in the opposite direction for bismuth, which contracts when liquefied. Other slight changes in physical properties are also induced by strong compression. The author suggests that these changes in density are due to the assumption by these substances under compression of the molecular condition characteristic of the liquid state. Reprinted with the permission of the American Chemical Society. Copyright © 2010. American Chemical Society (ACS). All Rights Reserved. [less ▲]

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See detailSur la décomposition de quelques sulfates acides à la suite d'une déformation mécanique
Spring, Walthère ULg

in Journal de Chimie Physique (1904), 2

Spring, W. Journal de Chimie Physique (1904), 2, 472-97; SciFinder (Chemical Abstracts Service: Columbus, OH); https://scifinder.cas.org (accessed July 8, 2010). A series of experiments on anhydrous and ... [more ▼]

Spring, W. Journal de Chimie Physique (1904), 2, 472-97; SciFinder (Chemical Abstracts Service: Columbus, OH); https://scifinder.cas.org (accessed July 8, 2010). A series of experiments on anhydrous and hydrated sulfates of the alkali metals was conducted to study the decomposition of some acid sulfates as the result of mechanical deformation. The compression was effected in a steel cylinder, the bottom of which was perforated with a single small hole to permit liquid to flow away and provided with a loosely-fitting piston between which and the walls of the cylinder the salt could "flow". Results demonstrate that under compression involving mechanical deformation, compounds which may be regarded as resulting from the combination of a solid with a liquid tend to decompose into these generators. Reprinted with the permission of the American Chemical Society. Copyright © 2010. American Chemical Society (ACS). All Rights Reserved. [less ▲]

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See detailEntrée du parti populaire au Conseil communal de Liège en 1302
Kurth, Godefroid ULg

in Leodium (1904), (3e année), 137-140

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See detailLa paroisse Saint-Jean-Baptiste à Liège
Kurth, Godefroid ULg

in Bulletin de la Société d'Art et d'Histoire du Diocèse de Liège (1904), IV(2e partie), 223-249

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See detailAbrégé de l'histoire de Belgique : à l'usage des écoles primaires
Kurth, Godefroid ULg

Book published by Lambert-de Roisin (1904)

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See detailDe kerk van Christus bij de keerpunten der geschiedenis
Kurth, Godefroid ULg; Ruyter, J.

Book published by Claessens - 2e éd. (1904)

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See detailNote bibliographique sur le tome IV 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 (1904)

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See detailNote bibliographique sur le mémoire de M. A. Carlot : Etude sur le domesticus franc
Kurth, Godefroid ULg

in Bulletin de la Classe des Lettres et des Sciences Morales et Politiques (1904)

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See detailNote bibliographique sur l'Inventaire des archives du la deuxième section des Archives générales du Royame par M. J. Cuvelier
Kurth, Godefroid ULg

in Bulletin de la Classe des Lettres et des Sciences Morales et Politiques (1904)

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See detailL'esprit critique en philosophie
Merten, Oscar ULg

Speech (1904)

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See detailFibrine
Fredericq, Léon ULg

in Richet, Charles (Ed.) Dictionnaire de physiologie. 006. Tome VI (1904)

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See detailL’atriotomie temporaire, procédé nouveau d’exploration des fonctions du cœur
Fredericq, Léon ULg

in Archives Internationales de Physiologie (1904), I

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See detailFibrinogène
Fredericq, Léon ULg

in Richet, Charles (Ed.) Dictionnaire de physiologie. 006. Tome VI (1904)

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See detailLa faune et la flore glaciaires du plateau de la Baraque-Michel (point culminant de l'Ardenne)
Fredericq, Léon ULg

in Bulletin de l'Académie Royale des Sciences, des Lettres et des Beaux-Arts de Belgique. Sciences (1904)

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See detailUn fait physique nouveau d'une importance capitale pour la géologie et l'astronomie physique
Folie, François ULg

in Bulletin de la Classe des Sciences. Académie Royale de Belgique (1904), 4

During twenty years, the author thought about the physical observation of irregularity motion of the earth's crust, which showed itself the existence of the diurnal nutation. The formulae of the ... [more ▼]

During twenty years, the author thought about the physical observation of irregularity motion of the earth's crust, which showed itself the existence of the diurnal nutation. The formulae of the variations of the speed of the earth's crust in giving an older publication, he talks about his various experiences that he realized by means of a very simple device, created by the engineer A. Rouma, which is involved in no action other than gravity and inertia. Observations are sufficient to physically demonstrate the existence of the diurnal nutation, the irregularity of the motion of the earth's crust and the independence between them and the core in the short term motion. [less ▲]

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See detailTrente-cinq années de travaux mathématiques et astronomiques (suite)
Folie, François ULg

Book published by Tipografia della pace di filippo Cuggiani (1904)

By the end of his life, the author published a summary of all his works in mathematics and astronomy. He also explains the difficulties to gain acceptance of his theories by his contemporaries.

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See detailSur la concentration moléculaire du sang et des tissus chez les animaux aquatiques
Fredericq, Léon ULg

in Archives de Biologie (1904), XX

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