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Articles 7651 - 7680 of 8705
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Cover And Contents
Turkish Journal of Electrical Engineering and Computer Sciences
No abstract provided.
From Engineering Electromagnetics To Electromagnetic Engineering: Using Computational Electromagnetics For Synthesis Problems, Anton G. Tijhuis, Martijn C. Van Beurden, Bastiaan P. De Hon, Hubregt J. Visser
From Engineering Electromagnetics To Electromagnetic Engineering: Using Computational Electromagnetics For Synthesis Problems, Anton G. Tijhuis, Martijn C. Van Beurden, Bastiaan P. De Hon, Hubregt J. Visser
Turkish Journal of Electrical Engineering and Computer Sciences
In this paper, a two-stage approach is proposed for using computational electromagnetics in antenna engineering. First, stochastic optimization techniques are used in combination with approximate models. Second, line-search techniques are combined with full-wave modeling. For the first stage, we show an illustrative example. The second stage is considered in detail; both the acceleration of the underlying field computations and the implementation of the optimization are discussed.
A Summary Of Recent Developments On Metamaterial-Based And Metamaterial-Inspired Efficient Electrically Small Antennas, Aycan Erentok, Richard W. Ziolkowski
A Summary Of Recent Developments On Metamaterial-Based And Metamaterial-Inspired Efficient Electrically Small Antennas, Aycan Erentok, Richard W. Ziolkowski
Turkish Journal of Electrical Engineering and Computer Sciences
This paper summarizes our recent research efforts to realize efficient electrically small antenna (EESA) systems based on ideal analytical and numerical metamaterial-based antenna systems, and physically realized metamaterial-inspired antenna designs. Our theoretical and numerical studies of the radiation and resonance behaviors of the proposed metamaterial-based EESA systems, as well as our efforts to conceptualize structures which might be used to build them, have led to the discovery of several realizable metamaterial-inspired EESA systems. The measurement results confirm the numerical performance predictions.
Cover And Contents
Turkish Journal of Veterinary & Animal Sciences
No abstract provided.
Cover And Contents
Turkish Journal of Veterinary & Animal Sciences
No abstract provided.
Hydrogenation Of Citral Over Ni And Ni-Sn Catalysts, Hi̇lal Aykaç, Selahatti̇n Yilmaz
Hydrogenation Of Citral Over Ni And Ni-Sn Catalysts, Hi̇lal Aykaç, Selahatti̇n Yilmaz
Turkish Journal of Chemistry
Liquid phase citral hydrogenation over zeolite-supported monometallic Ni and bimetallic Ni-Sn catalysts was studied. The zeolite support materials were Na-Y, Na-mordenite, and clinoptilolite. Ni and Sn contents of the monometallic and bimetallic catalysts were 8.1-9.2 wt% and 0.46 wt%, respectively. The type of the zeolite support affected the activity and selectivity of the catalysts differently. The main product of the citral hydrogenation reaction was citronellal, for both monometallic (84.5% yield) and bimetallic (44.5% yield) catalysts. The addition of promoter increased the selectivity to unsaturated alcohols (geraniol+nerol), i.e. it changed from 0.9% to 6.3% over mordenite and from 0.9% to 2.1% …
Computational Study Of Vibrational Dynamics Of Binary Mg_{0.70}Zn_{0.30} Metallic Glass By A Pseudopotential Theory, Aditya M. Vora
Computational Study Of Vibrational Dynamics Of Binary Mg_{0.70}Zn_{0.30} Metallic Glass By A Pseudopotential Theory, Aditya M. Vora
Turkish Journal of Physics
The vibrational dynamics of Mg_{70}Zn_{30} metallic glass has been studied at room temperature in terms of phonon eigen-frequencies of longitudinal and transverse modes employing three different approaches proposed by Hubbard-Beeby (HB), Takeno-Goda (TG) and Bhatia-Singh (BS). The well-recognized model potential is employed successfully to explain electron-ion interaction in the metallic glass; instead of using experimental values of the pair correlation function g(r), which is generated from the computed pair potential. The present findings of phonon dispersion curve are found in fair agreement with available theoretical as well as experimental data. The thermodynamic properties obtained by HB and TG approaches are …
Cover And Contents
Turkish Journal of Veterinary & Animal Sciences
No abstract provided.
Apparent Nutrient Digestibility Of Balanced Diets With Soy Bean Extract Or Meat And Bone Meal In The Nile Tilapia (Oreochromis Niloticus L.) Infected With Vibrio Anguillarum, Kenan Engi̇n, Ferbal Özkan
Apparent Nutrient Digestibility Of Balanced Diets With Soy Bean Extract Or Meat And Bone Meal In The Nile Tilapia (Oreochromis Niloticus L.) Infected With Vibrio Anguillarum, Kenan Engi̇n, Ferbal Özkan
Turkish Journal of Veterinary & Animal Sciences
Nile tilapia, Oreochromis niloticus L., infected with Vibrio anguillarum or not infected were fed balanced diets containing vegetal (solvent extracted soy bean meal (SBM)) or animal (meat and bone meal (MBM)) protein sources in order to demonstrate the apparent nutrient and energy digestibility. Regardless of protein sources in the diets, feed intake was lower in the infected group. Apparent nutrient (AD_{DM} and AD_{CP}) and energy digestibility (AD_{kJ}) values of Nile tilapia fed the SBM diet were significantly better (P < 0.05) than those fed the CONT and MBM diets and changed little between the measurement days in both groups (non-infected and infected). Although no visible symptoms associated with vibriosis were evident on either the skin or internal organs, the significantly lower (P < 0.05) AD_{DM}, AD_{CP}, and AD_{kJ} values obtained between day 1 and 10 (specifically on days 3 and 10) in the infected group fed the CONT and MBM diets might have implicated the pathogenicity of the bacteria. Further research concentrating on higher amounts of solvent extracted soy bean and meat and bone meal, different environmental conditions and doses of infection with V. anguillarum and immune response parameters including physiological and cellular stress responses is needed in order to identify the overall apparent nutrient digestibility of plant and animal protein sources in Nile tilapia infected with V. anguillarum.
Cover And Contents
Turkish Journal of Veterinary & Animal Sciences
No abstract provided.
The Effect Of Calosoma Sycophanta L. (Coleoptera: Carabidae) Feeding On The Pine Processionary Moth, Thaumetopoea Pityocampa (Denis & Schiffermüller) (Lepidoptera: Thaumetopoeidae), In The Laboratory, Mehmet Kanat, Torul Mol
The Effect Of Calosoma Sycophanta L. (Coleoptera: Carabidae) Feeding On The Pine Processionary Moth, Thaumetopoea Pityocampa (Denis & Schiffermüller) (Lepidoptera: Thaumetopoeidae), In The Laboratory, Mehmet Kanat, Torul Mol
Turkish Journal of Zoology
We determined the feeding capacity of Calosoma sycophanta L. (Coleoptera: Carabidae) by feeding them the pine processionary moth (PPM), Thaumetopoea pityocampa (Denis & Schiffermüller) (Lepidoptera: Thaumetopoeidae), under laboratory conditions. C. sycophanta is one of the most important predators of PPM larvae and pupae. Adult C. sycophanta can consume as much as 7-8 times their weight in food per day. On average, each C. sycophanta adult injured 10 PPM larvae while consuming 7 of these prey per day. The adults lived for 3-4 years. When young C. sycophanta larvae feed on 1 PPM larva, they can reach 1.4-1.6 cm in length …
Comparison Of Different Chemical Pulps From Wheat Straw And Bleaching With Xylanase Pre-Treated Ecf Method, Sai̇m Ateş, Celi̇l Atik, Yonghao Ni, Esat Gümüşkaya
Comparison Of Different Chemical Pulps From Wheat Straw And Bleaching With Xylanase Pre-Treated Ecf Method, Sai̇m Ateş, Celi̇l Atik, Yonghao Ni, Esat Gümüşkaya
Turkish Journal of Agriculture and Forestry
Different pulping processes, kraft-anthraquinone (AQ), bio-kraft, soda-AQ, ALCELL, and FORMACELL were studied for wheat straw. Fungal pre-treatment with Ceriporiopsis subvermispora, white rot fungi, was applied to wheat straw before kraft-AQ pulping, the so-called bio-kraft process. Fiber properties, carbohydrate contents, FT-IR analyses, strength properties of resultant paper, and bleachability characteristics were included to determine the properties of these pulp samples. In addition, the effects of the xylanase pre-treatment on the subsequent Elemental Chlorine Free (ECF) bleaching process were investigated. The results indicated that kraft-AQ pulps from wheat straw exhibited better characteristics than the other pulp samples with lower kappa number, higher …
Heat Capacity Anomalies Of Tlins_2 And Tlgas_2 Single Crystals Detected By Differential Scanning Calorimetry (Dsc), Muhammed Açikgöz
Heat Capacity Anomalies Of Tlins_2 And Tlgas_2 Single Crystals Detected By Differential Scanning Calorimetry (Dsc), Muhammed Açikgöz
Turkish Journal of Physics
Specific heat capacity C_p anomalies of layered single crystals TlInS_2 and TlGaS_2 have been investigated using differential scanning calorimetry (DSC) as a new technique for such crystals. Special features of C_p have been revealed in the temperature range of the possible phase transitions of both crystals. A sequence of maximum values of C_p is obtained at 163, 174, 184, 193, 201, 212, 224, 254, and 259 K for TlInS_2. In the case of TlGaS_2, the temperatures of the obtained maximum C_p values at 177 and 241 K agree well with the intervals of the phase transition temperatures reported in the …
Characterization Of Thin Film Al/P-Cdte Schottky Diode, M. G. Mahesha, V. B. Kasturi, G. K. Shivakumar
Characterization Of Thin Film Al/P-Cdte Schottky Diode, M. G. Mahesha, V. B. Kasturi, G. K. Shivakumar
Turkish Journal of Physics
A study has been made on the behavior of Al/p-CdTe thin film junction grown by thermal evaporation method. I-V characteristics show that the Al makes Schottky contact with p-CdTe. The variation of junction capacitance with frequency and voltage has been studied to evaluate the barrier height. The activation energy and band gap have been estimated by studying variation of resistivity with temperature. Using all these data, band diagram of Al/p-CdTe has been proposed.
Biological Control Of Bacterial Spot Disease Of Pepper With Bacillus Strains, Mustafa Mi̇ri̇k, Yeşi̇m Aysan, Özden Çinar
Biological Control Of Bacterial Spot Disease Of Pepper With Bacillus Strains, Mustafa Mi̇ri̇k, Yeşi̇m Aysan, Özden Çinar
Turkish Journal of Agriculture and Forestry
Bacterial spot disease caused by Xanthomonas axonopodis pv. vesicatoria (X. axonopodis pv. vesicatoria) is a devastating pepper (Capsicum annuum) disease in Turkey. Biological control of Xanthomonas axanopodis pv. vesicatoria is of great interest, in terms of environmental safety and economic return. In this study, 3 Bacillus strains isolated from soil samples of the rhizospheres of peppers grown in greenhouses and fields were used to suppress the size of the population of X. axonopodis pv. vesicatoria. Results indicated that disease development decreased by 11%-62% and 38%-67% in pepper plants inoculated with the 3 Bacillus strains alone and in combination, respectively, in …
Performance Analysis Of Collective Set-Move Lateral Sprinkler Irrigation Systems Used In Central Anatolia, İdri̇s Bahçeci̇, Ali̇ Fuat Tari, Nazmi̇ Di̇nç, Pinar Bahçeci̇
Performance Analysis Of Collective Set-Move Lateral Sprinkler Irrigation Systems Used In Central Anatolia, İdri̇s Bahçeci̇, Ali̇ Fuat Tari, Nazmi̇ Di̇nç, Pinar Bahçeci̇
Turkish Journal of Agriculture and Forestry
Performance assessment (PA) of irrigation and drainage systems has been an important area of research and debate in recent years. The present study was carried out to determine some performance parameters of sprinkler irrigation systems. Thirty-eight subunits (lateral) were monitored and assessed in the Konya Basin of Turkey. Sprinkler nozzle-pressure, flow rate, and their variations, and the amount of irrigation water were determined. Application and distribution uniformity, irrigation adequacy, and characteristics of system design and application were analyzed. Christensen Uniformity coefficient (CUC) and distribution uniformity (DU) values were between 41% and 88%, and between 18% and 81%, respectively. Variation in …
Development Of A Precision Seed Drill For Oilseed Rape, Ebrahim Ahmadi, Hamid Reza Ghassemzadeh, Mohammad Moghaddam, Kyeong Uk Kim
Development Of A Precision Seed Drill For Oilseed Rape, Ebrahim Ahmadi, Hamid Reza Ghassemzadeh, Mohammad Moghaddam, Kyeong Uk Kim
Turkish Journal of Agriculture and Forestry
At the present time, the most widely used machine for seed and oilseed planting is a seed drill with a roller-type-metering device. Due to nonuniform spacing of seeds along the rows and lack of control on planting depth, this machine aggravates the growth related problems and degrades the quality of a sensitive crop such as oilseed rape. To solve the above-mentioned problems, an attempt was made to develop a precision seed drill with a roller-type-metering device and a depth control system. Some of the design parameters affecting the uniformity of seed distribution were studied from the view point of roller …
Seed Quality, And Fatty Acid And Sugar Contents Of Pepper Seeds (Capsicum Annuum L.) In Relation To Seed Development And Drying Temperatures, İbrahi̇m Demi̇r, Azi̇z Teki̇n, Z. Aytanga Ökmen, Gamze Okçu, Burcu B. Kenanoğlu
Seed Quality, And Fatty Acid And Sugar Contents Of Pepper Seeds (Capsicum Annuum L.) In Relation To Seed Development And Drying Temperatures, İbrahi̇m Demi̇r, Azi̇z Teki̇n, Z. Aytanga Ökmen, Gamze Okçu, Burcu B. Kenanoğlu
Turkish Journal of Agriculture and Forestry
This study was carried out in order to determine the effects of drying temperature (25, 35, and 45 °C) and the developmental stage (55, 65, 75, and 85 days after anthesis (DAA)) on germination, vigor, and the sugar (sucrose, glucose, fructose) and fatty acid contents of pepper seeds (Capsicum annuum L.) over 2 consecutive years. In seeds harvested at 75 DAA and after, seed viability and vigor were not influenced by drying at temperatures up to 45 °C. Linoleic acid (18:2) was the main fatty acid in pepper seeds, comprising 75-80% of total fatty acids. It was followed by oleic …
Some Properties Of Eucalyptus Wood Flour Filled Recycled High Density Polyethylene Polymer-Composites, Fati̇h Mengeloğlu, Kadi̇r Karakuş
Some Properties Of Eucalyptus Wood Flour Filled Recycled High Density Polyethylene Polymer-Composites, Fati̇h Mengeloğlu, Kadi̇r Karakuş
Turkish Journal of Agriculture and Forestry
The mechanical properties of eucalyptus wood flours (EWF) filled recycled high density polyethylene (HDPE) composites were investigated. First thermal gravimetric analysis (TGA) and differential scanning calorimetry (DSC) analysis were conducted for recycled HDPE and EWF. Later the effects of EWF and maleic anhydride grafted polyethylene (MAPE) concentrations were studied. TGA analysis revealed that EWF and recycled HDPE started degrading around 230 °C and 280 °C, respectively. Melting temperature of the recycled HDPE was around 129 °C. Mechanical property evaluation showed that the increased concentration of EWF in polymer-composites reduced the tensile, flexural, and impact strength while increased the tensile and …