Showing papers by "Istanbul University published in 1979"
TL;DR: In this article, the degree of thermodynamic non-equilibrium, denoted by the ratio of actual quality to equilibrium quality, is correlated in terms of a dimensionless temperature difference which includes the superheated vapor temperature.
70 citations
TL;DR: In this article, the authors considered the elastostatic problem for an infinite orthotropic strip containing crack, where the crack was located along an axis of orthotropy, hence at an arbitrary angle with respect to the sides of the strip.
Abstract: The elastostatic problem for an infinite orthotropic strip containing crack was considered. It was assumed that the orthogonal axes of material orthotropy may have an arbitrary angular orientation with respect to the orthogonal axes of geometric symmetry of the uncracked strip. The crack was located along an axis of orthotropy, hence, at an arbitrary angle with respect to the sides of the strip. The general problem was formulated in terms of a system of singular integral equations for arbitrary crack surface tractions. As examples Modes 1 and 2 stress intensity factors were calculated for the strip having an internal or an edge crack with various lengths and angular orientations.
36 citations
TL;DR: The pole positions obtained from Upper Cretaceous and Eocene tuffs and dykes of the Mesudiye region, which is located between the north of the North Anatolian Fault Zone and eastern Black Sea coast, are at 75.3° N, 275.4° E and 41.6° E respectively as discussed by the authors.
Abstract: Summary. The pole positions obtained from Upper Cretaceous and Eocene tuffs and dykes of the Mesudiye region, which is located between the north of the North Anatolian Fault Zone and eastern Black Sea coast, are at 75.3° N, 275.4° E and 41.7° N, 138.6° E respectively. These results, taken together with the results of previous studies of Turkish rocks, suggest that rotational movements of Turkey have been 45–50° counterclockwise to Europe since the Upper Cretaceous.
33 citations
32 citations
TL;DR: In this paper, an efficient macro-element formulation for static analysis of curved box-girder bridges with variable cross section is presented, where the effect of prestressing is properly taken into account in the form of appropriate local loads considered at the element level.
29 citations
TL;DR: In the majority of cases, the disease manifested in the mild form, despite a history of one to five years' duration at the time of diagnosis, and only two patients were found to have cancer during the follow-up period.
Abstract: A clinical review of 204 cases of idiopathic ulcerative colitis (IUC) seen in an insurance hospital in Istanbul during a period of nine years is presented. The criteria of diagnosis were based on history and results of rectosigmoidoscopic, biopsy, and barium-enema examinations. In the majority of cases (74 per cent), the disease manifested in the mild form, despite a history of one to five years' duration at the time of diagnosis. These patients usually had single attacks, with recovery in reponse to treatment. The mortality rate for the whole series was 3.9 per cent. Death occurred in eight cases of patients who had the severe form of the disease involving the entire colon, with fulminating courses. One additional death was due to an accident. Treatment consisted of a high-protein, low residue diet, vitamins, rest, sulfa drugs and steroids. Azathioprine, in addition, was used in fulminating cases. Surgery supplemented medical therapy in 19 cases. Indications for surgical treatment were resistance to medical management, cancer, and polyposis. Only two patients (1.0 per cent) were found to have cancer during the follow-up period. These two were operated upon. Idiopathic ulcerative colitis is not a rare entity; with awareness and use of appropriate diagnosis facilities, more cases are being discovered.
14 citations
13 citations
TL;DR: An unusual case of giant aneurysmal dilatation of torcula in a 2 1/2-year-old boy with multiple intracranial venous sinus occlusions is described.
Abstract: An unusual case of giant aneurysmal dilatation of torcula in a 2 1/2-year-old boy with multiple intracranial venous sinus occlusions is described.
10 citations
TL;DR: In this paper, Peucedanol methyl ether was isolated from Hippomarathrum cristatum (Turkish Umbelliferous plant), and the circular dichroism curves of it in MeOH and CHCl3 were determined.
Abstract: (+)-Peucedanol methyl ether was isolated from Hippomarathrum cristatum (Turkish Umbelliferous plant), and the circular dichroism curves of it in MeOH and CHCl3 were determined.
7 citations
TL;DR: The effect of morphine on brain histamines levels in stress-exposed rats was investigated and it seemed that the brain histamine level was not directly affected by stressors, but morphine induced a sharp rise in the brain Histamine levels in both morphine- treated and morphine-treated stressed groups.
Abstract: The effect of morphine on brain histamine levels in stress-exposed rats was investigated. It seemed that the brain histamine level was not directly affected by stressors. However, morphine induced a sharp rise in the brain histamine levels in both morphine-treated and morphine-treated stressed groups. This effect of morphine was reversed by naloxone.
7 citations
01 Jan 1979
TL;DR: In this article, the authors distinguished two main climatic regions are distinguished as follows: 1) Lower Zone covers the plains at the sea lovel and the Western Taurus Mountains area up to an altitude of 1000-1100 meters where the draught lasts as long as 5 months approximately.
Abstract: Summary Antalya region is a complex piece of land which is located in the south-western Anatolia and extends to the North from the Antalya Bay and is composed of the western Taurus mountains Unites. The climatic conditions in this region indicate the characteristics of the Mediterranean climatic with mild and rainy winters, and hot and dry summers. Basically two main climatic regions are distinguished as follows: 1) « Lower Zone » covers the plains at the sea lovel and the Western Taurus Mountains area up to an altitude of 1000–1100 meters where the draught lasts as long as 5 months approximately. 2) « Higher Zone » covers the mountaineous areas where the hills are higher than 1100 meters, the summers start at least 2 months later and last much shorter. Cupressus sempervirens L. var. horizontalis which is a real forest tree grown in a narrow band (40–50 km) forms some pure or mixed stands with Pinus brutia on calcareous hilly sites of Lauretum Zone in lower parts of Mediterranean region of Turkey. Asides ...
TL;DR: In this paper, an active C filter realizing the general biquadratic transfer function is given, using signal flow graphs, and the active filter is shown to realize the transfer function.
Abstract: An active C filter realizing the general biquadratic transfer function is given, using signal flow graphs.
TL;DR: In this paper, a new ligand, 2-aminoethylthioacet(N-2-pyridylmethyl)amide, was synthesized and the complex formation of the ligand with CuII, CoII and CoIII ions was investigated.
Abstract: A new ligand, 2-aminoethylthioacet(N-2-pyridylmethyl)amide was synthesized. The complex formation of the ligand with CuII, CoII and CoIII ions and that of the carbobenzoxy derivative of the ligand with CuII ions has been investigated. Structures are proposed for all complexes isolated and the factors influencing metal-sulphur bond formation in the complexes discussed.
TL;DR: The ultrastructural changes seen in the secretory and storage cycles of glandular tissue of the nose mucosa from patients seem to arise as a reaction to the superficial epithelial deterioration of the nasal mucosa together with the resulting deterioration of physiological conditions.
Abstract: Alterations in the nasal mucous layer of atrophic rhinitis “Ozaena” patients have been investigated. The vast majority (99%) of these patients were women. Morphological findings in healthy nasal mucosa demonstrated the different functional stages of the glandular tissue cells with the healthy epithelium. On the other hand, nasal mucosal material taken from the patients displayed prominent epithelial deterioration, decrease in and loss of cilia, increase in goblet cells with squamous epithelial metaplasia. A decrease in secretory granules and membrane deterioration in the apical region of the secretory cells was also clearly visible. It is possible to postulate that the ultrastructural changes seen in the secretory and storage cycles of glandular tissue of the nasal mucosa from patients seem to arise as a reaction to the superficial epithelial deterioration of the nasal mucosa together with the resulting deterioration of physiological conditions.
TL;DR: In this paper, a new ligand, thiodiacetic acid-bis(2-pyridylmethylamide), has been synthesized and the formation and structures of its complexes with Cu, Ni, Co, Cd and Pt investigated.
Abstract: A new ligand, thiodiacetic acid-bis(2-pyridylmethylamide), has been synthesized and the formation and structures of its complexes with Cu, Ni, Co, Cd and Pt investigated.
TL;DR: In this article, a statistical multiparameter sensitivity measure for the transfer, gain and phase functions is defined for low sensitivity networks, where the integrands of these sensitivity measures include mean values as well as variances of element variations.
Abstract: New statistical multiparameter sensitivity measures are defined for the transfer, gain and phase functions. The integrands of these sensitivity measures include mean values as well as variances of element variations. It is shown that a very simple relationship exists between transfer, gain and phase measures even though element variations are large. General formulae are derived for small element variations, which would simplify evaluation of the measures. These formulae are helpful in the comparison of various low sensitivity networks.
TL;DR: The overlay is particularly useful for rather slow control systems and data handling between two different operating systems with incompatible formats for the data files having the CAMAC system as a mutual system component controllable by each of the operating systems individually.
TL;DR: In this paper, the propagation of surge waves in open channels is studied and the governing equations are derived for an arbitrary cross-section and specific solutions are given for rectangular, parabolic, and trapezoidal cross-sections.
Journal Article•
TL;DR: The mice (Balb/C strain) given 2% aspartic acid in 5% saccharose solution or only saccharoses solution (p. os) starting 12 hr before the sc morphine pellet implantation until the removal of pellet were rendered physically morphine dependent as discussed by the authors.
Abstract: The mice (Balb/C strain) given 2% aspartic acid in 5% saccharose solution or only saccharose solution (p. os) starting 12 hr before the sc morphine pellet implantation until the removal of pellet were rendered physically morphine dependent. During the development of morphine dependence and after the removal of pellets (on 3-d day) spontaneous motor activity and analgesic threshold were measured as reliable abrupt withdrawal signs. Aspartic acid prevented to some extent the appearance of symptoms of physical morphine dependence.
TL;DR: With the administration of methionine a decrease of lipid droplets and an improvement of the structures of most of the membranes and mitochrondria are observed in regard to the theory of the "chemically induced hyperplasia of the kidneys" related to folic acid.
TL;DR: In this paper, a modified colorimetric FFA determination method is proposed based on the change of the extraction solvent system and the amount of sodium chloride added to the Cu-TEA reagent.
Abstract: The proposed method is a modification of the widely used Duncombe's colorimetric FFA determination. This modified method is based on the change of the extraction solvent system and the amount of sodium chloride added to Cu-TEA reagent. Thus the disadvantages as high and unstable blank values, insufficient extraction of Cu-FFA complex, contamination of the organic phase with copper salts were eliminated. This method was successfully applied for the determination of lipolytic activity of heparin and marine algae extracts.
Eine Modifizierung der Duncombe-Methode und ihre Anwendung bei der Bestimmung der lipolytischen Aktivitat von Heparin
Bei der vorgeschlagenen Methode handelt es sich um eine Modifizierung der oft angewandten kolorimetrischen Bestimmungsmethode von freien Fettsauren nach Duncombe. Diese Modifizierung basiert auf der Anderung des Extraktionsmittels und der Menge des dem Cu-TEA-Reagenz zugegebenen Natrium-chlorids. Durch die Modifizierung konnten folgende Nachteile beseitigt werden: Zu hohe und instabile Blindwerte, ungenugende Extraktion des Cu-freien Fettsaure-Komplexes und Kontamination der organischen Phase mit Kupfersalz. Diese Methode wurde mit Erfolg bei der Bestimmung der lipolytischen Aktivitat von Heparin und Meeresalgenextrakten angewandt.