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[en] The invention concerns a welded heat exchanger with two or more fluids which can be used counter current. The principle of the apparatus allows the use of rolled welded concentric metal strips as well as spiral rolled metal strips. The ring sheets are kept apart either by their rigidity due to the cylindrical shape or by deformations in the sheets themselves or yet again by spacers or chequered and/or perforated sheets forming for instance corrugated spacers, the end sheet being thick enough to take the pressure strain
[fr]L'invention concerne un echangeur de chaleur soude a deux ou plusieurs fluides qui peut etre utilise en contre-courant. Le principe de l'appareil permet l'utilisation de toles concentriques roulees soudees aussi bien que de toles roulees en spirale. Les toles des viroles sont maintenues ecartees soit par leur propre rigidite due a la forme cylindrique, soit par des deformations dans les toles elles-memes, soit par des ecarteurs ou des feuilles gaufrees et/ou ajourees formant par exemple intercalaires a corrugations, la tole extreme etant d'une epaisseur suffisante pour reprendre les efforts de pression
[en] The invention relates to support means for radioisotope generation for use in various on-site industrial and medical applications, and has as an object the provision of a novel housing in which the formation of a short-lived daughter radioisotope from its longer-lived parent features counter-current batch flow of the eluting fluid of the separation system. (author)
[en] The description is given of a counter-current heat exchanger obtained by stacking preshaped and drilled plates, the collection ducts thus achieved being improved to achieve a significant passage section with respect to the section corresponding to the thickness between plates
[fr]On decrit un echangeur de chaleur a contre-courant obtenu par empilement de plaques preformees et percees, les cheminees de collecte ainsi obtenues etant ameliorees pour obtenir une section de passage importante vis-a-vis de la section correspondant a l'epaisseur entre plaques
[en] The effect of an axially varying countercurrent circulation rate in a gas centrifuge on the efficiency factors, e/sub I/ (the ideality efficiency) and e/sub C/ (the circulation efficiency), is investigated. The optimum value of the centrifuge parameter, m, which is a measure of the countercurrent circulation rate, is determined as a function of axial position in the centrifuge. Corresponding values of the centrifuge separation efficiency are presented. Numerical examples based on the centrifuge model recommended for use by the Workshop Committee are presented
[en] Centrifugal partition chromatography (CPC) belongs to the family called countercurrent chromatography (CCC) which involves liquid-liquid partition, and does not employ a solid support matrix. Although it has been applied to separate and purify a broad range of synthetic and naturally occurring chemical species, CPC offers distinct advantages for the separation of bioactive components from crude extracts of plants, marine organisms and microbial fermentation media. This paper will give some examples of the different applications of CPC. (auth.). 26 refs.; 6 figs.; 2 tabs
[en] Countercurrent aortography via radial artery was performed for detection of aortic arch anomalies in 4 infants with congenital heart disease. Author's cases of aortic arch anomalies were 3 cases of PDA, 1 case of coarctation of aorta, and 1 case of occlusion of anastomosis site on subclavian artery B-T shunt. And aberrant origin of the right SCA, interrupted aortic arch, hypoplastic aorta, anomalous origin of the right pulmonary artery from the ascending aorta can be demonstrated by this method. Countercurrent aortography affords an safe and simple method for detection of aortic arch anomalies without retrograde arterial catheterization, especially in small infants or premature babies
[en] The gas compressibility alters the pattern of the side-wall Stewartson 1/3 layer in a rapidly rotating cylinder. Let epsilon be the Ekman number, as epsilon (at the power 1/3) is of the order of magnitude of the square Mach number, the method allows the recirculating mass flow rate to be closed, neglecting terms of the order epsilon (at the power 1/3)
[fr]On etudie en fluide compressible, la structure de la couche de Stewartson un tiers le long de la paroi laterale d'un cyclindre en rotation rapide. Le nombre d'Ekman (epsilon) a la puissance un tiers etant du meme ordre de grandeur que l'inverse du nombre de Mach au carre, on assure la fermeture du debit de recirculation a un terme d'ordre epsilon (a la puissance 1/3) pres
[en] Present article is devoted to synthesis of p-tolyl (6.7-dihydro[1.4]dioxane 2',3':4.5 benzo[1.2-D]tiazol-2-il)sulfamate. The reaction course and the purity of compounds have been controlled by means of thin-layer chromatography.
[en] In this study, we investigated how a jumping strategy changes with an increase in the vertical jump height for a resultant ground reaction force (GRF) vector. We expected that the resultant force vector between two sequential motion phases (i.e., countermovement and push-off) of the counter movement jump would significantly change with the vertical jump height to take advantage of the resulting supportive force (i.e., an initial push-off force larger than the body weight) through the counter movement phase. Nine healthy young subjects were instructed to jump straight up to five different height levels ranging from 191 cm to 221 cm, and the kinematic and kinetic data were obtained in regular trials. The results showed that a lower center of mass position and larger resultant force vector were clearly observed in a higher jump, implying that the counter movement strategy changed with the vertical jump height to prepare for sufficient joint deviation and obtain a force advantage for larger push-off work.