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Filtreler
Bulunan: 389 Adet 0.002 sn
Koleksiyon [20]
Tam Metin [2]
Yayın Türü [8]
Yazar [20]
Yayın Yılı [1]
Konu Başlıkları [20]
Yayıncı [20]
Yayın Dili [3]
Dergi Adı [20]
Editör/Editörler [7]
Chloro[(N,N-dimethylamino)methylphenyl-kappa C-2(2),N](triphenylstibine)palladium(II)

Mentes, A | Buyukgungor, O

Article | 2004 | ACTA CRYSTALLOGRAPHICA SECTION E-CRYSTALLOGRAPHIC COMMUNICATIONS60

The molecular structure of the title compound, [PdCl(C9H12N)(C18H15Sb)], obtained by reaction of [Pd(dmba)(mu-Cl)](2) [ dmba = N(CH3)(2)CH2C6H5] with triphenylstibine in dichloromethane, shows a slightly distorted square planar geometry about Pd, which is bonded to C, N, Cl and Sb atoms.

4-[N,N-bis(2-hydroxyimino-2-phenylethyl)amino]-1,5-dimethyl-2-phenyl-2, 3-dihydro-1H-pyrazol-3-one monohydrate

Sengül A. | Karadayi N.

Article | 2004 | Acta Crystallographica Section C: Crystal Structure Communications60 ( 8 )

The title compound, C27H27N5O 3·H2O, is built up from pyrazolinone, phenyl and acetophenone oxime moieties. The 2-phenyl substituent is nearly perpendicular to the pyrazolinone ring, with a dihedral angle of 87.66 (1)°. The acetophenone oxime moieties are twisted out of the pyrazolinonering plane by 47.04 (1)°. The molecules in the crystal pack in an antiparallel fashion and are held together by hydrogen-bonded water molecules and intermolecular O-H?O and O-H?N hydrogen bonds.

N,N'-Bis[1-(pyrazin-2-yl)ethylidene]hydrazine

Sengül A. | Karadayi N. | Büyükgüngör O.

Article | 2004 | Acta Crystallographica Section C: Crystal Structure Communications60 ( 7 )

Molecules of the title compound, C12H12N6, contain both a diimine linkage and an N-N bond, and assume a planar structure. The compound lies about an inversion centre and there are three intramolecular C-H?N hydrogen bonds.

Fine mapping of the Schnyder's crystalline corneal dystrophy locus

Theendaraka V. | Tromp G. | Kuivaniemi H. | White P.S. | Panchal S. | Cox J. | Winters R.S.

Article | 2004 | Human Genetics114 ( 6 ) , pp.594 - 600

Schnyder's crystalline corneal dystrophy (SCCD) is a rare autosomal dominant eye disease with a spectrum of clinical manifestations that may include bilateral corneal clouding, arcus lipoides, and anterior corneal crystalline cholesterol deposition. We have previously performed a genome-wide linkage analysis on two large Swede-Finn families and mapped the SCCD locus to a 16-cM interval between markers D1S2633 and D1S228 on chromosome 1p36. We have collected 11 additional families from Finland, Germany, Turkey, and USA to narrow the critical region for SCCD. Here, we have used haplotype analysis with densely spaced microsatellite mar . . .kers in a total of 13 families to refine the candidate interval. A common disease haplotype was observed among the four Swede-Finn families indicating the presence of a founder effect. Recombination results from all 13 families refined the SCCD locus to 2.32 Mbp between markers D1S1160 and D1S1635. Within this interval, identity-by-state was present in all 13 families for two markers D1S244 and D1S3153, further refining the candidate region to 1.58 Mbp. © Springer-Verlag 2004 Daha fazlası Daha az

Does the conduction velocity distribution change along the nerve?

Pehlivan F. | Dalkilic N. | Kiziltan E.

Article | 2004 | Medical Engineering and Physics26 ( 5 ) , pp.395 - 401

Nerve conduction velocity distribution (CVD) is a very useful tool to examine the state and function of nerves. Only one record of compound action potential (CAP) may be sufficient to determine the CVD if the shape functions of the single fiber action potentials (SFAP) of fibers are known. Otherwise, CAP recordings from different locations are necessary to determine CVD. In this case, we confront the problem of whether the shape of the CVD changes along the nerve, because many methods that attempt to determine the CVD are based on the assumption that the CVD is invariant along the nerve. There is not a complete solution to this prob . . .lem, but there are many suggestions allied with the recording conditions to minimise this effect. The other effect that may influence both shapes of CAP and CVD along the nerve is the volume conductor effect. If a suitable model could isolate and eliminate the volume conductor effect, then the spatial variation of CVD may be attributed to the natural conditions of the nerve. In this study, we followed a procedure to eliminate volume conductor effect and then applied our previously published model to examine the spatial variations in CVD. The results show that CVDs estimated at discrete points along the nerve trunk have significantly different patterns. Consequently, it may be concluded that CVD is not uniform along an isolated nerve trunk contrary to the assumptions of the most CVD estimation methods. © 2004 IPEM. Published by Elsevier Ltd. All rights reserved Daha fazlası Daha az

Exergy analysis of the steam-injected gas turbine

Kopac M. | Zemher B.

Article | 2004 | International Journal of Exergy1 ( 3 ) , pp.363 - 374

In this paper, the effect of steam injection in the combustion chamber on the exergy efficiency of a gas turbine was investigated. Cycle exergy efficiency, net power output and exergy destruction have been calculated for different mass flow rates and temperature of the injected steam. The range of variation of the mass flow rate was between 0 and 5.24% of the design air flow rate, and the temperature of the injected steam varied between 500 and 650 K. It was found out that increasing the injected steam mass flow rate increases the net electric power output and decreases the total exergy destruction (or irreversibility) and the exerg . . .y efficiency. © 2004 Inderscience Enterprises Ltd Daha fazlası Daha az

Doppler Evaluation of the Thyroid in Pediatric Goiter

Mahmutyazicioglu K. | Turgut M.

Article | 2004 | Journal of Clinical Ultrasound32 ( 1 ) , pp.24 - 28

Purpose. The aim of this study was to identify any changes in Doppler parameters in the thyroid arteries of pediatric patients with a clinical diagnosis of goiter living in an area where goiter is endemic. Patients and Methods. In this prospective study, 20 pediatric patients with simple endemic goiter and 20 age-matched healthy subjects underwent sonographic examination. The resistance index (RI) and peak systolic velocity (PSV) on duplex sonography were measured from the inferior thyroid arteries, and the thyroid gland volume was recorded. Serum thyrotropin, free T3 hormone, and free T4 hormone levels were measured in both groups. . . . Results. The mean thyroid volume (± standard deviation) was significantly higher in the patients than in the healthy subjects (7.2 ± 1.4 ml versus 3.2 ± 1.1 ml; p < 0.01). The mean RI values for the thyroid arteries were significantly lower in the patient than in the control group (0.58 versus 0.70, respectively; p < 0.05). The mean PSV of the thyroid arteries was significantly higher for the patients than for the healthy subjects (mean, 36.7 cm/second versus 18.3 cm/second, respectively; p < 0.05). There was no correlation between the Doppler parameters and any of the hormone levels evaluated. Conclusions. In the arteries supplying the thyroid gland in a pediatric population, Rls were lower and PSVs higher in the patients with diffuse goiter than in the healthy control group. We discuss iodine deficiency as a possible mechanism for these changes. © 2003 Wiley Periodicals, Inc Daha fazlası Daha az

Photogrammetric analysis of the articular surface of the distal radius

Ege A. | Seker D.Z. | Tuncay I. | Duran Z.

Article | 2004 | Journal of International Medical Research32 ( 4 ) , pp.406 - 410

Three-dimensional measurements made using photogrammetry have recently gained popularity with the development of real-time detection facilities and up-to-date equipment. The modelling of human bones presents a particular challenge as the measurements required are difficult to obtain, especially from uneven surfaces. In this study, the articular surfaces of 12 radius bones were evaluated using photogrammetry to obtain three-dimensional coordinates of certain points. Morphometric characteristics of the digital topography of the articular surface were analysed using three-dimensional data from more than 200 points for each specimen. Th . . .e coronal plane curve, from the tip of the styloid process to the centre of the distal radioulnar articular notch, was found to be similar to the fourth degree polynomial function. A mathematical expression representing the sagittal curve passing through scapholunate border could not be found. Close-range photogrammetry is a safe and precise technique that can provide reliable, reproducible and accurate data for evaluating complex morphological surfaces Daha fazlası Daha az

Withdrawal capacity of pinned and unpinned round mortise and tenon furniture joints

Eckelman C. | Haviarova E. | Tankut A. | Denizli N. | Akcay H. | Erdil Y.

Article | 2004 | Forest Products Journal54 ( 12 ) , pp.185 - 191

Tests were conducted to determine the withdrawal capacity of cross-pinned round mortise and tenon joints. Tenon diameters ranged from a nominal 0.6 to 1. 0 inches. Cross-pins were about one-half the diameter of the tenons. Both wood and steel cross-pins were included. Glued but unpinned joints were included to provide a basis of comparison. Joints with wood cross-pins developed about one-third the capacity of comparable glued but unpinned tenons; joints with steel cross-pins developed over one-half the capacity. Offsetting the cross-pins toward the root of the tenon increased withdrawal capacity, whereas offsetting the cross-pin tow . . .ard the tip of the tenon decreased capacity. Shrink-fit techniques were found to provide a simple means of producing uniformly tight fitting joints. Shrink-fit joints produce significant levels of withdrawal capacity but likely should not be used alone without adhesives or cross-pins Daha fazlası Daha az

Open and closed circuit dry grinding of cement mill rejects in a pilot scale vertical stirred mill

Pilevneli C.C. | Kizgut S. | Toroglu I. | Çuhadaroglu D. | Yigit E.

Article | 2004 | Powder Technology139 ( 2 ) , pp.165 - 174

In this study, separator rejects of a closed circuit cement tube milling were dry ground in a 10-l pilot scale vertical stirred mill. Tests were done as open and closed circuit. The results were evaluated by size distributions, Blaine surface area of the products and the specific energy consumed during the tests. Mill capacity and the stirring speeds were the investigated parameters for the open circuit tests, whereas closed circuit tests were carried out at a constant stirring speed but variable discharge rate. Five speed levels used in the open circuit grinding tests are 200, 400, 600, 800 and 1000 rpm. The capacities were determi . . .ned to obtain product Blaine surface areas in the limits between 2000 and 5000 cm2/g. Closed circuit tests have resulted in 87%, 182% and 452% circulating loads. © 2004 Elsevier B.V. All rights reserved Daha fazlası Daha az

Radiologic aspects of abdominal hydatidosis in children - A study of 31 cases in Turkey

Erdem, LO | Erdem, CZ | Karlioguz, K | Uner, C

Article | 2004 | CLINICAL IMAGING28 ( 3 ) , pp.196 - 200

Objective: To determine the location and radiological characteristics in children with abdominal hydatid disease (HD). Materials and methods: Thirty-one children (average age: 7.2 years) with abdominal HD were studied. The number, location, diameter and internal architecture of the cysts were assessed with abdominal ultrasonography (US) and computed tomography (CT). Density measurements and enhancement patterns were determined on CT. Results: Twenty-one children had hepatic HD. The remaining 10 children had both hepatic and extrahepatic cysts. There were splenic cysts in five children, peritoneal cysts in two children and combined s . . .plenic and peritoneal cysts in three children. The most common site of the cysts was the liver (64%), followed by the spleen (20%) and the peritoneal cavity (16%). The seven intraabdominal cysts, which were not detected by US, were 20 min or less in diameter. Conclusion: CT may demonstrate additional small intrahepatic or unsuspected extrahepatic cysts. Although rare, splenic or peritoneal hydatidosis should be included in the differential diagnosis of a cystic splenic or peritoneal lesion. Familiarity with atypical locations of HD may be helpful in making a prompt, accurate diagnosis. We think that in particular patients, especially those who had diagnostic problem and who are under surgical planning, CT should be performed additionally. (C) 2004 Elsevier Inc. All rights reserved Daha fazlası Daha az

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