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Articles 6841 - 6870 of 8713
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Cover And Contents
Turkish Journal of Electrical Engineering and Computer Sciences
No abstract provided.
Noncausal Forward/Backward Two-Pass Iir Digital Filters In Real Time, Adnane Mouffak, Belbachir Mohamed Faouzi
Noncausal Forward/Backward Two-Pass Iir Digital Filters In Real Time, Adnane Mouffak, Belbachir Mohamed Faouzi
Turkish Journal of Electrical Engineering and Computer Sciences
A novel method for implementing noncausal forward/backward 2-pass recursive digital filters in real time is presented. It is based on a segment-wise block processing scheme without overlapping. Factors that degrade the linearity of the overall system's transfer function are discussed. An analytical condition that corrects the system's linearity is elaborated upon using the state variable approach. A recursive algorithm is developed to compute an implementable condition for real-time filtering. A single first in, first out queue memory is introduced to ensure an organized and continuous data stream into the proposed system. This technique allows real-time, sample-by-sample filtering, and it yields …
A Hybrid Approach For Power Quality Monitoring, Okan Özgönenel, Ümi̇t Kemaletti̇n Terzi̇, Abdesh Khan
A Hybrid Approach For Power Quality Monitoring, Okan Özgönenel, Ümi̇t Kemaletti̇n Terzi̇, Abdesh Khan
Turkish Journal of Electrical Engineering and Computer Sciences
This paper presents a novel hybrid approach for detection of power quality (PQ) disturbances. The proposed hybrid algorithm is based on applications of principle component analysis, discrete wavelet transform, and fast Fourier transform on voltage and current waveforms. The proposed PQ monitoring (PQM) software uses 3-phase voltage and current signals in order to detect possible power disturbances such as voltage sag, flicker, harmonics, transients, DC component, and electromagnetic interference. The test results demonstrate the potential of the proposed hybrid technique for PQM andPQ assessment.
Vibration Analysis Of Base Structure On Sins Using Pzt Actuators, Bin Zheng, Jianfeng Yang
Vibration Analysis Of Base Structure On Sins Using Pzt Actuators, Bin Zheng, Jianfeng Yang
Turkish Journal of Electrical Engineering and Computer Sciences
A steel plate bonded with lead zirconate titanate (PZT) actuators was studied on the basis of finite element methods (FEMs). The damping amplitudes of this plate bonded with PZT actuators were obtained at different locations and under different control conditions by analyzing the distribution of the PZT plate's strain tensor in the first 4 modes. Furthermore, to reduce the unwanted disturbance and mitigate the errors from sensors, a base structure of the missile's strapdown inertial navigation system (SINS) is also proposed. The results show that the vibration control can be enhanced by increasing the number of the PZT actuators bonded. …
Skewed Alpha-Stable Distributions For Modeling And Classification Of Musical Instruments, Mehmet Erdal Özbek, Mehmet Emre Çek, Feri̇t Acar Savaci
Skewed Alpha-Stable Distributions For Modeling And Classification Of Musical Instruments, Mehmet Erdal Özbek, Mehmet Emre Çek, Feri̇t Acar Savaci
Turkish Journal of Electrical Engineering and Computer Sciences
Music information retrieval and particularly musical instrument classification has become a very popular research area for the last few decades. Although in the literature many feature sets have been proposed to represent the musical instrument sounds, there is still need to find a superior feature set to achieve better classification performance. In this paper, we propose to use the parameters of skewed alpha-stable distribution of sub-band wavelet coefficients of musical sounds as features and show the effectiveness of this new feature set for musical instrument classification. We compare the classification performance with the features constructed from the parameters of generalized …
A Pseudo Spot Price Of Electricity Algorithm Applied To Environmental Economic Active Power Dispatch Problem, Celal Yaşar
A Pseudo Spot Price Of Electricity Algorithm Applied To Environmental Economic Active Power Dispatch Problem, Celal Yaşar
Turkish Journal of Electrical Engineering and Computer Sciences
In this study, an environmental economic active power dispatch problem is transformed into an optimization problem with a single-objective function by applying the weighted sum method (WSM) and the conic scalarization method (CSM). A pseudo spot price of electricity algorithm (PSPA) is used to solve the transformed problem. This is demonstrated on an example problem, which is a lossy electrical power system having only thermal units The WSM and CSM methods are applied to the example problem, and the weight factor values of these methods is increased from 0 to 1 by a step size of 0.1. For each possible …
Optimal In Vitro Realization Of Pulsatile Coronary Artery Flow Waveforms Using Closed-Loop Feedback Algorithms With Multiple Flow Control Devices, Serdar Yilmaz, Onur Toker, Nurullah Arslan, Herman Sedef
Optimal In Vitro Realization Of Pulsatile Coronary Artery Flow Waveforms Using Closed-Loop Feedback Algorithms With Multiple Flow Control Devices, Serdar Yilmaz, Onur Toker, Nurullah Arslan, Herman Sedef
Turkish Journal of Electrical Engineering and Computer Sciences
In this paper, we study optimal in vitro realization of pulsatile coronary artery flows using newly proposed closed-loop feedback algorithms with a clearly defined mathematical performance objective, and we compare several flow control device technologies in terms of their ability to generate pulsatile flow signals as accurately as possible. In the literature, there are several published results for in vitro pulsatile flow realization systems. However, most of the proposed systems operate in an open-loop setting and use a single flow control device, and their performance is assessed mostly by graphical means without a clearly defined mathematical performance objective. Furthermore, some …
A Novel Approach For Optimal Allocation Of Distributed Generations Based On Static Voltage Stability Margin, Mohsen Rezaie Estabragh, Mohsen Mohammadian, Mehdi Shafiee
A Novel Approach For Optimal Allocation Of Distributed Generations Based On Static Voltage Stability Margin, Mohsen Rezaie Estabragh, Mohsen Mohammadian, Mehdi Shafiee
Turkish Journal of Electrical Engineering and Computer Sciences
This paper presents a newly developed approach to find the optimal location of distributed generations (DGs) to improve power system voltage stability margin and reduce losses incorporating the constraints. The loadability limit index is used to assess the static voltage stability security margin, which is associated with the point of voltage collapse limit. Based on this, a toolbox is developed to recognize the loadability margin in power networks. Finally, the mentioned problem is modeled as a nonlinear and multiobjective optimization problem. The proposed method establishes a tradeoff between the security index and power losses in DG placement using the hybrid …
A Novel Motor Speed Calculation Method Using Square Wave Speed Sensor Signals Via Fast Fourier Transform, Hayri̇ Arabaci, Osman Bi̇lgi̇n
A Novel Motor Speed Calculation Method Using Square Wave Speed Sensor Signals Via Fast Fourier Transform, Hayri̇ Arabaci, Osman Bi̇lgi̇n
Turkish Journal of Electrical Engineering and Computer Sciences
This paper presents a novel motor speed measurement method and experimental results using the fast Fourier transform (FFT). Motor speed is obtained using the square wave output signal of a speed sensor. In the proposed method, the speed can be measured in a wide range, and transient speed changes can also be clearly observed. The experiments were conducted during start-up and in steady state. The sampled speed data were transformed to frequency spectrums using the FFT. The frequency, which corresponds to the maximum amplitude in the spectrum, was used to calculate the motor speed. The test results show that the …
Voltage Stability Via Energy Function Analysis On Reduced Order Model Of Power System, Ahmet Çi̇fci̇, Yilmaz Uyaroğlu, Mehmet Ali̇ Yalçin
Voltage Stability Via Energy Function Analysis On Reduced Order Model Of Power System, Ahmet Çi̇fci̇, Yilmaz Uyaroğlu, Mehmet Ali̇ Yalçin
Turkish Journal of Electrical Engineering and Computer Sciences
A power system is a typical nonlinear dynamical system and voltage stability is an important subject of power system stability. This paper describes the use of the variable gradient method in a reduced order model of a single-machine infinite-bus power system. Additionally, the system's Lyapunov (energy) function is created and thus the system's energy level changes' effects on the system's stability are shown using the MACSYMA program. The Lyapunov function allows the determination of stability for nonlinear systems without the need to find exact solutions.
Analysis And Characterization Of Longitudinal Flux Single-Sided Linear Switched Reluctance Machines, Lenin Chokkalingam, Arumugam Rengasamy
Analysis And Characterization Of Longitudinal Flux Single-Sided Linear Switched Reluctance Machines, Lenin Chokkalingam, Arumugam Rengasamy
Turkish Journal of Electrical Engineering and Computer Sciences
Linear switched reluctance motors (LSRMs) have recently gained more popularity for propulsion drives. This paper contributes a certain design improvement to reduce the force ripple in LSRMs. By affixing a pole cap in the stator pole, the target is achieved. Finite element analysis has been carried out to predict the performance of the basic and proposed structures. Motor performances for different load conditions are simulated. The application of fast Fourier transform has been utilized to envisage the vibration frequencies. The experimental results are well correlated with the predicted results.
Cover And Contents
Turkish Journal of Veterinary & Animal Sciences
No abstract provided.
Cover And Contents
Turkish Journal of Veterinary & Animal Sciences
No abstract provided.
Preparation Of Porphyrinated Polyacrylonitrile Fiber Mat Supported Tio_2 Photocatalyst And Its Photocatalytic Activities, Linjun Shao, Ji Chen, Luyao He, Guiying Xing, Weixi Lv, Zaina Chen, Chenze Qi
Preparation Of Porphyrinated Polyacrylonitrile Fiber Mat Supported Tio_2 Photocatalyst And Its Photocatalytic Activities, Linjun Shao, Ji Chen, Luyao He, Guiying Xing, Weixi Lv, Zaina Chen, Chenze Qi
Turkish Journal of Chemistry
Fe(III)meso-tetraphenylporphyrinated polyacrylonitrile fiber mat supported TiO_2 photocatalyst (PANC/ TiO_2 mat) was prepared via copolymerization and electrospinning. SEM images showed that well-defined fibers with diameters around 1.47 \pm 0.26 \mu m were fabricated from Fe(III)meso-tetraphenylporphyrin (FeTPP)-acrylonitrile copolymer (PANC) and TiO_2 mixture. The XRD characterizations demonstrated that the electrospinning process had no effect on the anatase structure of TiO_2. The photocatalytic activity of the PANC/TiO_2 mat was examined for the photodegradation of methyl red in aqueous solution under the irradiation of visible light. The results showed that this PANC/TiO_2 fiber mat was very efficient for the photodegradation of methyl red, with a …
Comparative Photodecolorization Of Red Dye By Anatase, Rutile (Tio_2), And Wurtzite (Zno) Using Response Surface Methodology, Shahab Khameneh Asl, Sayad Khatib Sadrnezaad, Mansour Keyanpour-Rad, Deni̇z Üner
Comparative Photodecolorization Of Red Dye By Anatase, Rutile (Tio_2), And Wurtzite (Zno) Using Response Surface Methodology, Shahab Khameneh Asl, Sayad Khatib Sadrnezaad, Mansour Keyanpour-Rad, Deni̇z Üner
Turkish Journal of Chemistry
Treatment of dye pollution containing C.I. Acid Red 14 (AR14) by a coupled photocatalytic process was studied. Titanium dioxide, in the form of anatase and rutile, and zinc oxide, were used as photocatalysts. The investigated photocatalysts were Aldrich-produced nanopowders with crystallites of a mean size of 20-30 nm and a specific surface area of about 50 m^2/g. A comparison of TiO_{2(anatase)}, TiO_{2(rutile)}, TiO_{2(a,r)}, and ZnO for the decolorization of the AR14 solution was performed. Results showed that color removal followed the decreasing order of TiO_{2(a,r)}, ZnO > TiO_{2(a,r)} > TiO_{2(a)}, ZnO > TiO_{2(r)}, ZnO >TiO_{2(a,r)} > TiO_{2(a)} > ZnO > TiO_{2(r)}. Response surface methodology (RSM) was …
A Case With Type Iv Dual Left Anterior Descending Coronary Artery Detected By Multidetector Computed Tomography, Tahi̇r Durmaz, Meli̇ke Ruşen Meti̇n, Telat Keleş, Hüseyi̇n Ayhan, Engi̇n Bozkurt
A Case With Type Iv Dual Left Anterior Descending Coronary Artery Detected By Multidetector Computed Tomography, Tahi̇r Durmaz, Meli̇ke Ruşen Meti̇n, Telat Keleş, Hüseyi̇n Ayhan, Engi̇n Bozkurt
Turkish Journal of Medical Sciences
Coronary artery anomaly is a rare but important condition, especially when an intervention is required. If the observer does not consider the possible presence of a coronary artery anomaly during coronary angiography or cardiac multislice/multidetector-row computed tomography (MDCT), these anomalies can be overlooked. Herein, we present a case with a type IV dual left anterior descending coronary artery anomaly detected with MDCT.
Cerebral Blood Flow During Single Lung Ventilation, Mehmet Muharrem Erol, Si̇bel Kul, Ayşegül Cansu, Celal Teki̇nbaş, Engi̇n Ertürk, Murat Topbaş
Cerebral Blood Flow During Single Lung Ventilation, Mehmet Muharrem Erol, Si̇bel Kul, Ayşegül Cansu, Celal Teki̇nbaş, Engi̇n Ertürk, Murat Topbaş
Turkish Journal of Medical Sciences
Our aim was to show the effect of one-lung ventilation (OLV) on cerebral blood flow (CBF) by measuring carotid blood flow. This technique has been the subject of experimental and clinical studies. Materials and methods: Carotid doppler flows were measured at 4 different times. Peak systolic velocity (PSV) and end diastolic velocity (EDV) were measured and pulsatility index (PI) and resistive index (RI) calculated. Results: There were no significant changes in PSV, PI, RI, or flow volume in the normal or diseased sides at repeated measures (P > 0.05).There was no significant difference between the flow velocities, PIs, RIs, or flow …
Minimum Inhibitory And Minimum Bactericidal Concentrations Of Boron Compounds Against Several Bacterial Strains, Murat Tolga Yilmaz
Minimum Inhibitory And Minimum Bactericidal Concentrations Of Boron Compounds Against Several Bacterial Strains, Murat Tolga Yilmaz
Turkish Journal of Medical Sciences
Boron compounds are essential micronutrients for many organisms. However, they negatively affect plant, soil, and water microflora if excessive amounts exist in irrigation water. Therefore, this study aimed to define the minimum inhibitory concentrations (MICs) and minimum bactericidal concentrations (MBCs) of boric acid and borax by selecting the bacteria that can survive in all environments. Materials and methods: The antibacterial efficacy of boric acid and borax against several bacterial strains was evaluated 3 times with the macrodilution broth method. Results: The MICs and MBCs of boric acid were obtained as 3.80 mg/mL, 3.80 mg/mL, 7.60 mg/mL, and 7.60 mg/mL against …
Thermostable \Alpha-Amylase From Moderately Halophilic Halomonas Sp. Aad21, Kami̇l Serkan Uzyol, Berna Sariyar Akbulut, Azi̇z Akin Deni̇zci̇, Di̇lek Kazan
Thermostable \Alpha-Amylase From Moderately Halophilic Halomonas Sp. Aad21, Kami̇l Serkan Uzyol, Berna Sariyar Akbulut, Azi̇z Akin Deni̇zci̇, Di̇lek Kazan
Turkish Journal of Biology
The moderately halophilic Halomonas sp. strain AAD21, which produces extracellular thermostable \alpha-amylase, was isolated from the Çamaltı Saltern area located in İzmir, Turkey. NaCl, carbon, and nitrogen sources in the growth medium were optimized to enhance \alpha-amylase yield. The highest enzyme yield was measured in the presence of 20% NaCl with peptone as the nitrogen and starch as the carbon sources in the fermentation broth. This microorganism was also found to utilize waste potato peel as a carbon source for \alpha-amylase production. Concentrations of carbon and nitrogen sources were optimized using a statistical approach, and \alpha-amylase activity increased from 4.07 …
Antioxidant Activity And Luteolin Content Of Marchantia Polymorpha L., Alper Gökbulut, Basri̇ Satilmiş, Kadi̇r Batçioğlu, Barbaros Çeti̇n, Engi̇n Şarer
Antioxidant Activity And Luteolin Content Of Marchantia Polymorpha L., Alper Gökbulut, Basri̇ Satilmiş, Kadi̇r Batçioğlu, Barbaros Çeti̇n, Engi̇n Şarer
Turkish Journal of Biology
Antioxidant activity of the methanol and ethyl acetate extracts of Marchantia polymorpha L., which grows naturally in Turkey, was tested by DPPH and ABTS methods. According to the applied methods, both extracts exhibited moderate activity. Some phenolic compounds that could be responsible for the activity were investigated by RP-HPLC, qualitatively and quantitatively, in the methanolic extract of liverwort. While caffeic acid, chlorogenic acid, rutin, myricetin, quercetin, and kaempferol were not found in the extract, luteolin as the liable antioxidant agent was determined as 0.0052 ± 0.0002% among the investigated compounds.
Copper Bioremoval By Novel Bacterial Isolates And Their Identification By 16s Rrna Gene Sequence Analysis, Eli̇f Ölmezoğlu, Bi̇nnur Kiratli Herand, Mehmet Sali̇m Öncel, Kenan Tunç, Melek Özkan
Copper Bioremoval By Novel Bacterial Isolates And Their Identification By 16s Rrna Gene Sequence Analysis, Eli̇f Ölmezoğlu, Bi̇nnur Kiratli Herand, Mehmet Sali̇m Öncel, Kenan Tunç, Melek Özkan
Turkish Journal of Biology
Copper-tolerant bacteria were isolated from soil samples taken from a region where metal industries are located. After selecting 2 isolates with relatively higher bioremoval efficiency, the effects of increasing copper concentration, pH, and temperature on the bioremoval efficiency of the growing isolates were determined. Strain N1c and strain N5a showed maximal bioremoval efficiency of 82% and 75%, respectively, in 20 mg/L copper-containing medium at pH 6.8 and 30 °C. Although the isolates did not grow well at pH 5, a low amount of copper was removed at pH 5. Slow growth of N5a at pH 5 allowed for 26% copper …
Dipeptidyl Peptidase Iv Production By Solid State Fermentation Using Alternative Fungal Sources, Gaye Öngen, Sayit Sargin, Özlem Üstün, Ceren Kutlu, Mesut Yücel
Dipeptidyl Peptidase Iv Production By Solid State Fermentation Using Alternative Fungal Sources, Gaye Öngen, Sayit Sargin, Özlem Üstün, Ceren Kutlu, Mesut Yücel
Turkish Journal of Biology
The present work was carried out for the production of dipeptidyl peptidase IV (DPP IV; EC 3.4.14.5) using Aspergillus, Penicillium, and Rhizopus strains under solid state fermentation conditions. Response surface methodology was applied for the optimization of the selected operational variables (corn flour, initial moisture content, and cultivation time) for DPP IV activity as the response. The optimal parameters of DPP IV activity for the independent variables, namely the amount of corn flour (% w/w), initial moisture content (% w/w), and cultivation time (days), were evaluated to be 2.44%, 60.85%, and 4.69 days, respectively, using Aspergillus awamori T116. The response …
Effects Of \Alpha-Lipoic Acid On Dna Damage, Protein Oxidation, Lipid Peroxidation, And Some Biochemical Parameters In Sub-Chronic Thinner-Addicted Rats, Muhsi̇n Konuk, Tuğba Şahi̇n, İbrahi̇m Hakki Ci̇ğerci̇, Abdurrahman Fati̇h Fi̇dan, Safi̇ye Eli̇f Korcan
Effects Of \Alpha-Lipoic Acid On Dna Damage, Protein Oxidation, Lipid Peroxidation, And Some Biochemical Parameters In Sub-Chronic Thinner-Addicted Rats, Muhsi̇n Konuk, Tuğba Şahi̇n, İbrahi̇m Hakki Ci̇ğerci̇, Abdurrahman Fati̇h Fi̇dan, Safi̇ye Eli̇f Korcan
Turkish Journal of Biology
The present study was carried out to determine the effects of sub-chronic thinner addiction on the oxidant-antioxidant balance, the relation between toxicity and oxidative stress, and a possible protective effect of \alpha-lipoic acid against thinner toxication in rats. Sprague-Dawley rats were divided into 5 groups as follows: control (K), olive oil (Z), \alpha-lipoic acid (L), thinner (T), and \alpha-lipoic acid + thinner (LAT). Each group was composed of 15 rats, and the study lasted 8 weeks. After completing the animal studies malondialdehyde (MDA), reduced glutathione (GSH), methemoglobin (MetHb), toluol, and mononuclear leucocyte damage levels; protein oxidation, nitric oxide (NO_x) metabolites, …
Hetero-Molecular Associations In Different Polar And Non-Polar Binary Mixtures, Susmita Kamila, Ganesh Durgachalam Natraj
Hetero-Molecular Associations In Different Polar And Non-Polar Binary Mixtures, Susmita Kamila, Ganesh Durgachalam Natraj
Turkish Journal of Physics
Excess molar volumes and viscosity deviations have been studied comparatively for some binary systems involving nitrobenzene, aniline, methanol, benzene, toluene and CCl_4 by experimentally measured values of viscosity and density. These values are interpreted in the light of hetero-molecular associations among the polar and non-polar constituents.
Performance Analysis Of A Two Stage Pad Cooling System In Broiler Houses, Meti̇n Petek, Serdal Di̇kmen, Mehmet Mustafa Oğan
Performance Analysis Of A Two Stage Pad Cooling System In Broiler Houses, Meti̇n Petek, Serdal Di̇kmen, Mehmet Mustafa Oğan
Turkish Journal of Veterinary & Animal Sciences
The cooling performance of a traditional (control) and two stage evaporative pad cooling system (experiment), including pad and fan with tunnel ventilation, for poultry houses and the growth performance of broilers reared in these systems was compared in a study performed during extreme summer temperatures. The experimental unit had a two stage pad cooling system, which consisted of underground tubes and a box, followed by a pad cooling system with tunnel ventilation. The control unit had a traditional evaporative cooling system, including pad and fan with tunnel ventilation. Air temperature, relative humidity, and saturation efficiency were used to determine the …
Probiotic Properties, Sensory Qualities, And Storage Stability Of Probiotic Banana Yogurts, Songül Çakmakçi, Bülent Çeti̇n, Tamer Turgut, Mustafa Gürses, Ahmet Erdoğan
Probiotic Properties, Sensory Qualities, And Storage Stability Of Probiotic Banana Yogurts, Songül Çakmakçi, Bülent Çeti̇n, Tamer Turgut, Mustafa Gürses, Ahmet Erdoğan
Turkish Journal of Veterinary & Animal Sciences
The quality properties of probiotic yogurt samples made with banana marmalade (BM), which can be a probiotic product, were examined. Yogurt samples were produced from cow milk inoculated with yogurt cultures and probiotic cultures (Lactobacillus acidophilus, Bifidobacterium bifidum, and an equal mixture of the 2 strains), and then 15% BM was added to each yogurt sample. Acidity, pH, bacteria counts, and sensory analysis of the yogurt samples were investigated on days 1, 3, 5, 7, 10, and 14 during storage at 4 °C. Lactobacillus delbrueckii subsp. bulgaricus, Streptococcus thermophilus, L. acidophilus, and B. bifidum counts generally decreased during the storage …
A Checklist Of Turkish Rotifers, Mustafa Ruşen Ustaoğlu, Ahmet Altindağ, Murat Kaya, Nuray Akbulut, Ahmet Bozkurt, Di̇dem Özdemi̇r Mi̇s, Si̇bel Atasağun, Sevi̇l Erdoğan, Aysel Bekleyen, Serap Saler, Hacer Canan Okgerman
A Checklist Of Turkish Rotifers, Mustafa Ruşen Ustaoğlu, Ahmet Altindağ, Murat Kaya, Nuray Akbulut, Ahmet Bozkurt, Di̇dem Özdemi̇r Mi̇s, Si̇bel Atasağun, Sevi̇l Erdoğan, Aysel Bekleyen, Serap Saler, Hacer Canan Okgerman
Turkish Journal of Zoology
In a book chapter containing the first checklist and distribution of Turkish rotifers, published in 1999, were listed 167 taxa. The second checklist, published in 2004, reported 229 rotifer taxa in Turkey. During the 7 years since this checklist process, many studies have been carried out and we have prepared a new checklist of Turkish rotifers in the present study. In all, 341 rotifer taxa have been recorded to date.