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Articles 8461 - 8490 of 8705
Full-Text Articles in Entire DC Network
Chlorination Of Two Turkish Lignites In Water And Water-Carbon Tetrachloride Media, Semra Karaca, Yücel Yaşar Kadioğlu, Sami̇h Bayrakçeken, M. Şahi̇n Gülaboğlu
Chlorination Of Two Turkish Lignites In Water And Water-Carbon Tetrachloride Media, Semra Karaca, Yücel Yaşar Kadioğlu, Sami̇h Bayrakçeken, M. Şahi̇n Gülaboğlu
Turkish Journal of Chemistry
The chlorine uptake of two Turkish lignites during chlorinolysis with chlorine gas in water and water-carbon tetrachloride media at ambient pressure (\cong 610 mmHg) was examined. The effects of speed of stirring (5-20s^{-1}), particle size (74-88, 150-180 and 250-425 \mu m), temperature (13-70°C) and chlorination time (0-18000 s) were studied. It is shown that the amount of chlorine uptake of both coals increased with decreasing particle size and increasing temperature.
Hydrogen Evolution At Platinum (Pt) And At Platinized Platinum (Ptz) Cathodes, Bi̇rgül Yazici
Hydrogen Evolution At Platinum (Pt) And At Platinized Platinum (Ptz) Cathodes, Bi̇rgül Yazici
Turkish Journal of Chemistry
In this study, the cathodic behaviours of bright platinum (Pt) and at platinized platinum (Ptz) on the platinum anode were investigated in a 1M Na_2SO_4 electrolyte (pH, from 2 to 8) by means of electrolysis. The theoretical (\Delta Erev) and experimental (\Delta E_{exp}) discharge potentials and the cathodic overpotentials (\etac) of the systems were determined. The amounts of hydrogen gas produced at different times on the cathodes at a constant potential (5V) were measured and the hydrogen yield was calculated. The resulting scheme has been very helpful to obtain wodified electrocatalytic coating and electrode structures at Ptz cathode, able to …
Reaction Mechanism And Kinetics Of Aqueous Solutions Of Primary And Secondary Alkanolamines And Carbon Dioxide, Olgac Bavbek, Erdoğan Alper
Reaction Mechanism And Kinetics Of Aqueous Solutions Of Primary And Secondary Alkanolamines And Carbon Dioxide, Olgac Bavbek, Erdoğan Alper
Turkish Journal of Chemistry
The mechanism and kinetics of the reaction between aqueous solutions of CO_2 and the alkanolamines 1-amino-2-propanol, 3-amino-1-propanol,2-methyl aminoethanol and 2-ethyl aminoethanol were investigated using a stopped flow technique. It was found that the reaction orders according to power law kinetics were between 1.1 and 2.0, depending on the alkanolamine and the concentration ranges investigated. This fractional order was therefore considered to be further evidence that carbamate formation takes place according to a zwitterion mechanism rather than a one-step reaction. The kinetic rate parameters for these alkanolamines were evaluated from experimental data at 303 K according to this mechanism.
Clinical And Histopathological Indicators Of Neckmetastasis In Laryngeal Carcinoma, Şefi̇k Hali̇t Akmansu, Hakan Korkmaz, Engi̇n Dursun, Seli̇m Sermet Erbek, Hakan Göçmen, Tuğba Ünal, Cavi̇t Özeri̇
Clinical And Histopathological Indicators Of Neckmetastasis In Laryngeal Carcinoma, Şefi̇k Hali̇t Akmansu, Hakan Korkmaz, Engi̇n Dursun, Seli̇m Sermet Erbek, Hakan Göçmen, Tuğba Ünal, Cavi̇t Özeri̇
Turkish Journal of Medical Sciences
Determination of cervical metastasis preoperatively is very important in planning the treatment strategy in laryngeal carcinoma. In spite of vigorous clinical and detailed high technology radiological examinations, the occult metastasis rate is between 12-17% in No necks. In recent years most of the studies are related to the clinical and histopathological risk factors that may effect cervical metastasis. In this study we reviewed the primary tumors and neck specimens of laryngeal carcinoma patients operated in our clinic retrospectively. In 46 laryngeal carcinoma patients with laryngectomy and neck dissection, the following criteria were examined; Tumor localization, T status, histologic grading, peripheral …
Opinions Of Assistant Doctors In Süleymandemirel University Medical Faculty Aboutstatistical Knowledge, Mustafa Öztürk, Veli̇ddi̇n Selçuk Engi̇n, Ahmet Nesi̇mi̇ Ki̇şi̇oğlu
Opinions Of Assistant Doctors In Süleymandemirel University Medical Faculty Aboutstatistical Knowledge, Mustafa Öztürk, Veli̇ddi̇n Selçuk Engi̇n, Ahmet Nesi̇mi̇ Ki̇şi̇oğlu
Turkish Journal of Medical Sciences
In scientific investigations; statistical knowledge is essential for collection and analysis of data properly as well as correct interpretation of literature information. In this study that was made in March 1997, opinions of 46 assistant doctors in Süleyman Demirel University Medicine Faculty about statistical knowledge were investigated by a questionnaire. All respondents have agreed on the fact that comprehension of the statistical process in an article was necessary for throughout understanding. Besides, 43 of them (93.5%) admitted that their present statistical knowledge was few or absent at all. All assistant doctors stated that a statistical education program need to be …
New Frontiers In The Reperfusion Of Myocardialinfarction, Mehmet Ağirbasli, Spencer B. King
New Frontiers In The Reperfusion Of Myocardialinfarction, Mehmet Ağirbasli, Spencer B. King
Turkish Journal of Medical Sciences
No abstract provided.
Differentiating Type Of Muscle Movement Via Ar Modeling And Neural Network Classification, Beki̇r Karlik
Differentiating Type Of Muscle Movement Via Ar Modeling And Neural Network Classification, Beki̇r Karlik
Turkish Journal of Electrical Engineering and Computer Sciences
The aim of this study is to classify electromyogram (EMG) signals for controlling multifunction proshetic devices. An artificial neural network (ANN) implementation was used for this purpose. Autoregressive (AR) parameters of $a_1, a_2, a_3, a_4$ and their signal power obtained from different arm muscle motions were applied to the input of ANN, which is a multilayer perceptron. At the output layer, for 5000 iterations, six movements were distinguished at a high accuracy of 97.6%.
Neural Classifiers For Learning Higher-Order Correlations, Marifi Güler
Neural Classifiers For Learning Higher-Order Correlations, Marifi Güler
Turkish Journal of Physics
Studies by various authors suggest that higher-order networks can be more powerful and are biologically more plausible with respect to the more traditional multilayer networks. These architectures make explicit use of nonlinear interactions between input variables in the form of higher-order units or product units. If it is known a priori that the problem to be implemented possesses a given set of invariances like in the translation, rotation, and scale invariant pattern recognition problems, those invariances can be encoded, thus eliminating all higher-order terms which are incompatible with the invariances. In general, however, it is a serious set-back that the …
Light Emission From Travelling Space Charge Domains, M. Hostut, N. Balkan
Light Emission From Travelling Space Charge Domains, M. Hostut, N. Balkan
Turkish Journal of Physics
We report light emission from n-doped GaAs epilayers associated with impact ionization when the device is biased in the negative difference resistance (NDR) regime (F > 3.5 kV cm^{-1}). Spectral distribution of the emitted light (electroluminescence) has been measured to identify the energy distribution of the recombining electron-hole pairs. Electron temperatures, calculated from the high energy tail of the electroluminescence spectra, show that the light emission is due to the recombination of the impact ionized holes with the background, channel, and the travelling space charge electrons. The range of the electron temperatures obtained indicate that the contribution to the light emission …
Feasibility Of Fabrication Of Heteroepitaxial Ge_X Si_{1-X}/Si(111) Structure By Pulsed Nd: Yag Laser, R. N. Al-Rawi, R. A. Ismail, R. N. Mousis
Feasibility Of Fabrication Of Heteroepitaxial Ge_X Si_{1-X}/Si(111) Structure By Pulsed Nd: Yag Laser, R. N. Al-Rawi, R. A. Ismail, R. N. Mousis
Turkish Journal of Physics
Heteroepitaxial Ge_x Si_{1-x} alloy layers have been formed by 10 ms and 300 \mu s laser pulse induced mixing of pure germanium films and Si(111) substrates where Ge films of thickness (500-1250) Å are thermally evaporated onto Si(111) under vacuum pressure \sim 10^{-5} Torr. The near surface of the sample then undergoes rapid melting and regrowth processes during each pulse from a free running Nd; YAG laser. The alloy layers are (4.6-6.5) \mum thick and have a Ge fraction of x = 6-8.2%.
Prevailing Conditions, Problems And Devolopment Posibilities Of Greenhouses In The Black Sea Region, Bi̇lal Cemek, Yusuf Demi̇r
Prevailing Conditions, Problems And Devolopment Posibilities Of Greenhouses In The Black Sea Region, Bi̇lal Cemek, Yusuf Demi̇r
Turkish Journal of Agriculture and Forestry
The aim of this study is the determination of the prevailing conditions, characteristics and problems of commercial greenhouse growing in the Black Sea region. For this purpose, Samsun, Ordu, Giresun and Amasya were selected. Potentials, types and structural conditons of the greenhouses were determined. It was established that there are more than 5790 greenhouses, 75 percent of have an average floor area of 150-200 m^2. The heating and ventilation needs for greenhouses in this region, which commonly have floor areas of 150-200 m^2, were determined. Calculations were made in order to determine the type of greenhouses suitable for this region,and …
The Investigation Of Loading, Unloading Andstacking Operations In Forest Transportation In Terms Of Time, Productivity And Cost In Western Black Sea Region, Meti̇n Tunay, Tuğrul Varol
The Investigation Of Loading, Unloading Andstacking Operations In Forest Transportation In Terms Of Time, Productivity And Cost In Western Black Sea Region, Meti̇n Tunay, Tuğrul Varol
Turkish Journal of Agriculture and Forestry
This study was conducted on methods used in loading, unloading and stacking carried out in forests and forest depots in the western Black Sea region. The aims of this study were to compare methods in terms of time, cost and productivity, and to make suggestions on how these activities could be made more efficient. Time studies were conducted using human and mechanical force for loading, unloading and stacking operations in chosen sample working units, with continuously running chronometer. The results, according to analysis of time measurements, show that administration expenses canbe minimized by using Granab 4515, which has maximum loading …
Examination Of Long-Term (1929-1990) Daily Minimum, Mean And Maximum Temperature Values Of Adana By Time Series Analysis, Ali̇ Yücel, Fati̇h Topaloğlu
Examination Of Long-Term (1929-1990) Daily Minimum, Mean And Maximum Temperature Values Of Adana By Time Series Analysis, Ali̇ Yücel, Fati̇h Topaloğlu
Turkish Journal of Agriculture and Forestry
Climatic changes observed historically need to be known accurately in order to understand the present climatic conditions and to estimate climatic changes to be occur in future. In studies to be done to determine temporal variation of climatic variables, it is accepted that changes can be defined certainly in deterministic methods, and the result of the statistical methods have also spot errors due to the shortage of observation periods and random of observations. In this respect, a model presenting interested climate variable is developed depending on present short observation period. Then, parameters related to the developed model are estimated and …
Influence Of Rhizobium Inoculation And Fertilization On Nodulation And Yield Of Pea (Pisum Sativum L.), Sai̇m Özdemi̇r, Ufuk Karadavut, Cahi̇t Erdoğan
Influence Of Rhizobium Inoculation And Fertilization On Nodulation And Yield Of Pea (Pisum Sativum L.), Sai̇m Özdemi̇r, Ufuk Karadavut, Cahi̇t Erdoğan
Turkish Journal of Agriculture and Forestry
An experiment was conducted at Hatay in experimental station and farmers field during 1995-96 and 1996-97 season to work out the response of pea cv. Marmara to Rhizobium inoculation and chemical fertilization. Rhizobium inoculation increased the number of nodules and nodules dry weight in both year and location significantly. Nodulation status were superior in farmers field which has persistent history of legume cultivation. Nitrogen application and inoculation significantly increased total above ground dry matter except farmers field in 1996-97, and seed yields over uninoculated and without nitrogen given plots in both location. The highest above ground dry matter and seed …
Withdrawal Strength Of Some Screws And Nails In Waferboard And Picea Or Oriental Beech, Ayhan Özçi̇fçi̇, Sefer Doğanay
Withdrawal Strength Of Some Screws And Nails In Waferboard And Picea Or Oriental Beech, Ayhan Özçi̇fçi̇, Sefer Doğanay
Turkish Journal of Agriculture and Forestry
In this paper; it was carried out to determine the withdrawal strength of some screws and nails of WFB, picea and oriental beech that are using at furniture product. For this reason, it was applied the withdrawal strength of experimental specimens with different screws and nails. According to the result of experiments, it was obtained the highest withdrawal strength result of oriental beech whose face perpendicular to screw 20x35 (17,670 N/mm^2). It was obtained the highest withdrawal strength result of picea whose face parellel to nails such as 16x30 (6,920 N/mm^2).
Comparison Of Inhibitory And Bactericidalactivities Of Cefoperazone + Sulbactam Againstpseudomonas Aeruginosa Strains, From 1992 To1994, Pinar Zarakolu, Ni̇lay Çöplü, Ahmet Aslantürk, Belkis Levent, Engi̇n Güvener
Comparison Of Inhibitory And Bactericidalactivities Of Cefoperazone + Sulbactam Againstpseudomonas Aeruginosa Strains, From 1992 To1994, Pinar Zarakolu, Ni̇lay Çöplü, Ahmet Aslantürk, Belkis Levent, Engi̇n Güvener
Turkish Journal of Medical Sciences
In this study; inhibitory and bactericidal activities of cefoperazone + sulbactam against Pseudomonas aeruginosa strains were determined in two studies first in 1992 and second in 1994. Minimum inhibitory concentration (MIC) and minimum bactericidal concentration (MBC) values were determined by following the microdilution method recommended by NCCLS (Approved Standard M7-A2 1990) protocol. P.aeruginosa strains were isolated from different clinical materials. The results of the studies were then compared to point out if the difference between MIC and MBC values were significant and if there was resistance development following two years of use. In the first study in 1992: MIC90 and …