Biga Meslek Yüksekokulu Koleksiyonu

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https://hdl.handle.net/20.500.12428/3542

Listeleniyor 1 - 20 / 31

Determining the Biogas Potential from Animal Manure in Canakkale and Creating an Electricity Generation Capacity Map
(Int Journal Renewable Energy Research, 2025) Oğuz, Emrah; Oğuz, Yüksel
In this study, the biogas production potential from animal manure in Canakkale was determined and the electrical energy production capacity of the province was determined. According to the 2021 cattle, small ruminant, and poultry numbers received from the Provincial Directorate of Agriculture and Forestry, the cattle, small ruminant, and poultry manure amounts of all districts were calculated. Then, the amount of biogas that could be produced was calculated based on this data digital maps of the province were created by calculating the equivalent electrical energy production values of all districts with the biogas energy potentials that can be obtained. It has been calculated that a total of 119,715,927.80 m(3) of biogas can be obtained annually throughout the province. The total annual equivalent electrical energy of this potential is 562,664.86 MWh. In line with the data obtained, it has been determined that Canakkale has a 70 MW biogas power plant potential.
The Perceptions of Turkish Consumers Regarding In Vitro Meat and the Relationship Between These Perceptions and Willingness to Try and Consume In Vitro Meat
(Wiley, 2025) Eser, Ayşe Gülin; Keçici, P. Dilara; Yılmaz Eker, Funda; Ekiz, Bülent
This study aims to determine Turkish consumers' perceptions and attitudes toward in vitro meat and to investigate the relationship between their perceptions and their willingness to try and consume it. The questionnaire was distributed to potential participants via social media, and the responses of 989 participants were evaluated. The responses regarding the extent to which participants agreed with 32 opinions about in vitro meat were analysed using principal component analysis (PCA). As a result of PCA, four components were obtained explaining 63.3% of the total variance: i) benefits for the environment, and human and animal welfare; ii) safety and reliability; iii) social and ethical concerns; and iv) concerns about being unnatural. Regression equations developed with these components were able to moderately explain (R2 ranged between 0.547 and 0.583) the variance observed in consumers' willingness to try, regularly consume, replace conventional meat with and try in vitro meat when recommended by a friend.
Investigation of the effect of shallow and deep cryogenic treatment on wear and impact performance of DIN 1.2344 steel
(Elsevier, 2025) Kara, Fuat; Filiz, Serhat; Yamiç, Cengizhan
Hot work tool steels are preferred in different areas of industry due to their high toughness values and high impact resistance at high temperatures. Although there are many studies in the literature on DIN 1.2344 hot work tool steel, which is widely used in hot work tool steels, it has been determined that the studies examining the effects of cryogenic treatment on this material are limited. In this study, hardness, impact, tensile, wear tests were applied on DIN 1.2344 hot work tool steel and microstructure examination was carried out. In the study, the effects of shallow cryogenic treatment (SCT) and deep cryogenic treatment (DCT) at two different waiting times on mechanical properties (microhardness, macrohardness, yield and tensile strength, elongation amount, impact energy) were investigated compared to the conventional heat treated (CHT) sample. Microstructure, surface roughness and wear performance were investigated as a result of wear tests. As a result, it was found that shallow and deep cryogenic treatment provided 1.34%, 9.31% and 13% improvement on wear resistance for SCT-12, SCT-24 and DCT-36, respectively, compared to conventional heat treatment. In terms of impact resistance, the highest value was 2.37% improvement in DCT sample.
LRS Bianchi-I universe model with domain wall in f(R, T) gravity
(Iop Publishing Ltd, 2025) Çağlar, Halife
In this work, strange quark matter (SQM) and normal matter (NM) attached to domain wall (DW) matter distributions have been examined for locally rotationally symmetric (LRS) Bianchi-I space-time has been investigated. The model has been constructed in the framework of f(R, T) theory for f(R, T) = R + 2 mu T which is suggested as an alternative gravitation theory instead of Einstein's General Relativity Theory. Obtained modified field equations have been solved by using scale factors equation A = Bm come from the proportion of expansion scalar theta to shear scalar Pi 2. SQM and NM are added to DW with the help of equations of state (EoS) pm=13(rho m-4Bc) and pm = (gamma - 1)rho m. Pressure and energy densities of all matter distributions have been obtained depending on cosmic time t and their effects decrease by the time. It is found that DW matter behaves like stiff matter due to attaining DW pressure equal to DW energy density pDW = rho DW. Also obtained values of scale factors and some kinematic quantities give an expanding universe for the model. Energy conditions and kinematic quantities of the model have been examined in the last section. In addition, General Relativity solutions of the model have been attained by assuming mu = 0 in f(R, T) = R + 2 mu T. All solutions have been concluded in detail.
Ceviz taneni uygulanmış ağaç türlerinin yüzey parlaklık özellikleri
(2024) Yaşar, Şadiye; Uzun, Alaaddin; Yalınkılıç, Ahmet Cihangir; Yaşar, Mehmet
Günümüzde artan çevresel kaygılar, araştırmacıları daha ekolojik ve sürdürülebilir malzemelere yönlendirmektedir. Bu çalışmada ceviz taneninin ceviz (Juglans regia L.) ve sarıçam (Pinus sylvestris L.) odunlarının yüzey parlaklık özellikleri üzerindeki etkileri araştırılmıştır. Bu amaçla, sarıçam ve ceviz ağacının yüzeylerine fırça kullanılarak ceviz tanen uygulanmış, ardından su bazlı ve poliüretan verniklerin kaplamaları yapılmıştır. Tanen uygulamasının görsel etkisini değerlendirmek için ahşap örneklerin yüzey parlaklığı ölçülmüştür. Liflere dik ve paralel olarak en yüksek parlaklık değeri poliüretan vernikli sarıçam kontrol örneklerinde, liflere dikte en düşük ise su bazlı vernikli ceviz kontrol örneklerinde, paralel de en düşük değer ise tanen + poliüretan vernikli cevizde bulunmuştur. Bulgular, vernik türünün parlaklık değerlerini önemli ölçüde etkilediğini ve ceviz tanen uygulamasının her iki ağaç türünün yüzey parlaklık özellikleri üzerinde gözle görülür bir etkiye sahip olduğunu göstermektedir.
Mobilya Sektörü Çalışanlarında Güvenlik İkliminin Belirlenmesi
(2024) Çabuk, Yıldız; Murat, Murat; Aşkın, Ayşin
Etkili bir güvenlik yönetimi kazalar ve hastalıklar ortaya çıkmadan tehlikelerin belirlenmesini, gerekli önlemlerin alınmasını ve insan faktörüne dikkat edilmesini kapsar. Bunun tespit edilmesinin bir yöntemi de güvenlik iklimi ya da güvenlik kültürü gibi göstergeler aracılığı ile güvenliğin ölçülmesidir. Çalışma ortamlarında güvenlik bilincinin eksik olması doğrudan ve dolaylı maliyetler olarak birçok kayba neden olmaktadır. İş kazalarının çoğunluğunun çalışandan kaynaklı olarak gerçekleştiği bilinmektedir. Bu çalışma mobilya sektörü çalışanlarında güvenlik ikliminin belirlenmesi amacıyla gerçekleştirilmiştir. Çalışmanın evrenini Bursa ili İnegöl ilçesinde yer alan mobilya işletmeleri oluşturmaktadır. Çalışma verilerinin elde edilmesinde, çalışanların güvenlik ikliminin belirlenmesi ve değerlendirilmesi için kullanılan Nordic Güvenlik İklimi Anketi (NOSACQ-50) kullanılmıştır. Anket çalışmayı kabul eden 6 adet mobilya fabrikası çalışanlarına uygulanmış (105 anket) ve SPSS istatistiksel 20,0 paket programı kullanılarak değerlendirilmiştir. Çalışma sonucunda kadın çalışanlarda güvenlik hassasiyetinin yüksek olduğu, orta yaş grubu çalışanlarda güvenlik önceliği konusunun ve riski kabul etmeme durumunun önemli olduğu, eğitim durumuna göre ilkokul mezunlarının gelişmelere açık olduğu tespit edilmiştir.
Carbon nanotube reinforced LDPE/SAN thermoplastic nanocomposites: thermo-mechanical and electromagnetic interference shielding properties
(2024) Divan, Onur; Yıldırım, Ferhat; Eskizeybek, Volkan
A prevalent area of research is the development of structural polymer composites with diverse functions. An ingenious material solution is two-phased nanocomposites with distinctive structural and electrical characteristics. This study produced a nanocomposite structure with carbon nanotube-reinforced low-density polyethylene (LDPE) and styrene acrylonitrile (SAN) as a thermoplastic matrix. The injection molding method was used in the production of nanocomposites. Thermo-dynamic and electromagnetic shielding properties of the nanocomposites were investigated. As the LDPE/MWCNT ratio added to pure SAN increased, the storage modulus decreased as expected, and the storage modulus for the MB50 sample was determined as 1.24 GPa with a 50% decrease. The percolation threshold for the two-phase thermoplastic composite was obtained for the MB50 sample containing 10 wt% carbon nanotubes. In addition, the MB75 sample containing 15 wt% carbon nanotubes reached an EMSE value of 37 dB.
Sol-gel derived ZnO:Sn thin films and fabrication of n-ZnO:Sn/p-Si heterostructure
(Elsevier B.V., 2021) Sarıca, Emrah; Güneş, İbrahim; Akyüz, İdris; Bilgin, Vildan; Ertürk, Kadir
In this work ZnO:Sn thin films were deposited onto glass and p-Si substrates by spin coating of prepared sols which contains different amounts of Zn(CH3COO)2·2H2O and SnCl2 (0, 5, 10 and 15%). Physical properties of ZnO films were examined as a function of SnCl2 in prepared sols. In addition to that, heterostructure examinations were also carried out by depositing all films on p-Si substrates as well. XRD studies revealed that all films have c-axis orientation with crystallite sizes between 38 and 47 nm. AFM and SEM images showed that morphology of the films remarkably deteriorated with the increase in amount of SnCl2 in sol. Optical transmittance and absorbance spectra showed that films have high transmittance and low absorbance in the visible region. Besides, optical band gap increased from 3.27 eV to 3.37 eV. Additional band gap energies were determined for 10% and 15% Sn doped ZnO films. Room temperature photoluminescence spectra for all films were deconvoluted for the evaluation of all emission bands and it was noted that incorporation of SnCl2 into sol led to enhancement of UV-blue emission bands and caused emission bands related to oxygen vacancies to diminish. Four-point-probe measurements revealed that electrical resistivity of ZnO:Sn films increased from 3.20 × 100 Ωcm to 2.82 × 104 Ωcm and diode ideality factor of Ag/ZnO:Sn/p-Si/Au heterostructure was calculated to be in the range of 2.14–4.59 while zero-bias barrier height is in the range of 0.63–0.78 eV.
Effect of synchronized fixed-time AI and non-pregnant heifer delayed feedlot entry on reproductive performance and system economics
(Oxford Univ Press Inc, 2024) Landblom, Douglas G.; Hanna, Lauren L.; Parman, Byron; Perry, George A.; Paisley, Steve; Şentürklü, Songül
Heifer reproduction management research is being conducted at the NDSU–Dickinson Research Extension Center. Using crossbred heifers, the objective was to evaluate reproductive performance and economic efficiencies comparing a drylot synchronized fixed-time AI protocol with clean-up bulls to two grazing systems using a fixed-time AI protocol without clean-up bulls. Synchronization protocol:14-d CIDR-PG-GnRH (TAI 66 h ± 2 h). Fixed-time AI treatments: 1) Drylot Control (DLOT) with clean-up bulls, 2) Integrated diverse crop-heifer annual forage grazing (IAF, no clean-up bulls), and 3) Native range grazing (NR, no clean-up bulls). Following pregnancy ultrasound on d 85, non-pregnant heifers continued to bale-graze until late November, when they were transferred to the University of Wyoming SAREC feedlot, finished, harvested at Cargill Meat Solutions packing plant, Ft. Morgan, CO, and grid marketed. Data were analyzed using the MIXED procedure of SAS. Year 1 and 2 grazing days were 121, and 149, respectively. Synchronized TAI pregnancy rates yr 1 and 2 for DLOT, IAF, and NR were 59.4, 43.8, and 62.5%; 68.8, 46.9, and 34.4%, respectively. Total DLOT control pregnancy rates yr 1 and 2 were 90.6 and 100%. Grazing heifer feedlot performance Yr 1 did not differ for starting body weight (BW; 452 vs 436 kg, P = 0.29), ending BW (610 vs 600 kg, P = 0.74), gain (157 vs 164 kg, P = 0.69), average daily gain (ADG; 1.42 vs 1.48 kg, P = 0.70), dry matter (DM) feed intake (15.0 vs 14.7 kg, P = 0.73), F:G (4.81 vs 4.56 kg, P = 0.42), daily feed cost ($7.45 vs $9.47, P = 0.73), feed cost/kg BW gain ($3.11 vs $2.95, P = 0.51), and feed and yardage cost ($3.41 vs $3.24, P = 0.55). Year 2 grazing heifer feedlot performance for the IAF and NR were starting BW (501 vs 456 kg, P = 0.007), ending BW (670 vs 604 kg, P = 0.004), feedlot finishing gain (143 vs 123 kg, P = 0.05), ADG (1.08 vs 0.93 kg/day, P = 0.06), daily DM feed intake (20.1 vs 20.1 kg/d, P = 0.98), feed to gain ratio (7.13 vs 8.22 kg/d, P = 0.11), daily feed cost ($9.61 vs $9.54/d, P = 0.94), feed cost/kg BW gain ($4.05 vs $4.67/kg, P = 0.11), and feed and yardage cost/kg gain ($4.45 vs $5.13/kg, P = 0.092). IAF and NR Yr 1 HCW (P = 0.83), dressing % (P = 0.69), marbling score (P = 0.78) did not differ. Year 2, except for hot carcass weight (HCW; 379 vs 341 kg, P = 0.004), dressing pct (P = 0.99), fat depth (P = 0.29), marbling score (P = 0.94) did not differ. Systems 2-yr mean net return for DLOT, IAF, and NR were $592, $296, $379, respectively. Systems net return profitability was very good for all management comparisons, but reduced for IAF and NR due to IAF farming, finishing, and transportation costs, and NR finishing and transportation costs.
Enhancing π-SnS thin films and fabrication of p-SnS/n-Si heterostructures through flow rate control in ultrasonic spray pyrolysis for improved photovoltaic performance
(Springer Heidelberg, 2024) Güneş, İbrahim
This study presents findings related to the characterization of cubic SnS (pi-SnS) thin films and p-SnS/n-Si heterojunction structures produced simultaneously using the ultrasonic spray pyrolysis technique. In this context, the impact of different spray solution flow rates on the morphological, structural, optical, and electrical characteristics of the films was examined. Morphological analyses revealed that higher flow rates resulted in films with denser and smoother surfaces, approximately 6 nm in roughness. Additionally, it was observed that both the thickness and the growth rate of the films could be adjusted through the modulation of the flow rate. Structural analyses determined that the crystallite size increased and micro-strain values decreased with increasing flow rates. Optical evaluations indicated a decline in the optical band gap of the thin films from about 1.8 eV to 1.7 eV as the flow rates increased. This trend was consistently observed in the data obtained using the Tauc method and the derivative of transmission with respect to wavelength versus photon energy graphs. Electrical analyses revealed that the resistivity values of the thin films increased from 5.24 x 105 ohm cm to 1.64 x 106 ohm cm with increasing flow rates. Furthermore, I-V analyses of the Au/p-SnS/n-Si/Ag heterojunction structures indicated significant variability in key electrical properties. The saturation currents displayed a broad range, suggesting varying efficiencies in charge carrier collection across different samples. Similarly, the change of ideality factors pointed to differences in charge transport mechanisms, while the shifts in barrier heights indicated changes in junction properties with different fabrication conditions. The results of this study offer valuable perspectives for future research.
Effects of supplementing the rainbow trout (Oncorhynchus mykiss) diet with Spirulina and Chlorella on the tissue's cadmium detoxification capacity, growth performance, fatty acid composition, antioxidant defense system and liver histology
(Elsevier, 2025) Harmantepe, Fatma Burcu; Gündoğdu, Ayşe; Karslı, Zafer; Sağır, Dilek
This study aimed to determine the effects of the addition of Spirulina and Chlorella of the diets of rainbow trout (Oncorhynchus mykiss) on their growth, nutrient composition, the parameters of their antioxidant defense systems, liver histology, and the cadmium removal process of their tissues. Fish with an average weight of 84.25 +/- 3.55 g containing Cd in their tissues were distributed in 15 tanks with 18 fish per tank. The fish were fed diets consisting of 0% (Control-1), 0% (Control-2), 4% Chlorella, 4% Spirulina and Chlorella +2% Spirulina twice a day until they were satiated for a period of 80 days. At the conclusion of the experiment, it was determined that diets containing microalgae demonstrated increased growth rates, and that the growth values obtained from the 4% Spirulina and the Control-1 were similar (p > 0.05). Regarding the fatty acid content, with the addition of microalgae to the diet, a significant (p < 0.05) decrease in SFA values and a significant (p < 0.05) increase in PUFA values were observed compared to the groups Control-1 and Control-2. On days 40 and 80, Cd levels in the muscle and liver tissue of the fish were found to be significantly (p < 0.05) lower in the groups that were fed diets containing microalgae in comparison with the Control-2 group. On days 40 and 80, the SOD, CAT, GSH, GST, and GPx values of liver tissues were higher (p < 0.05) than those of the Control-2 group. As a result of the semiquantitative histopathological evaluation of the liver tissues, improvements were observed in all groups containing microalgae; however, the most remarkable improvement was achieved in the Spirulina group. The results obtained in the study revealed that the addition of microalgae to rainbow trout feed removed Cd from liver and muscle tissues, reinforced the antioxidant defense system parameters, and increased growth. However, when the groups containing microalgae were compared among themselves, the diets containing 4 % Spirulina and 2 % Chlorella +2 % Spirulina were found to be more effective on these parameters.
Flow rate-dependent properties of SnO2 thin films deposited by ultrasonic spray pyrolysis
(Elsevier, 2024) Güneş, İbrahim; Sarıca, Emrah; Özcan, Hakan Bilal; Terlemezoğlu, Makbule; Akyüz, İdris
This study unveils the outcomes of fabricating and characterizing SnO2 thin films through ultrasonic spray pyrolysis. Also, it focuses on the effect of manipulating flow rates on their structural, optical, and electrical characteristics. Structural analysis revealed that the films exhibited a tetragonal rutile structure and (200) crystallographic planes become preferential as the flow rate increases. Crystallite size and lattice strain were calculated using the Debye-Scherrer and Williamson-Hall methods, demonstrating that higher the flow rate resulted in larger crystallite sizes and reduced lattice strain. SEM images showed that all films have uniform and consistent film thickness and grain size enlarged with the solution flow rate as well. The films exhibited high optical transparency (>80%) in the visible spectrum, making them suitable for transparent conductive applications. The band gap of the films decreased gradually with flow rates, and the Urbach energy slightly increased. Hall effect measurements revealed higher flow rates resulted in lower sheet resistance (lowest is 1.32 x 10(2) Omega/sq) and higher carrier mobility (highest is 22.12 cm(2)/V.s), indicating improved electrical properties. These findings offer valuable perspectives for forthcoming researches.
Fluorine-doped tin oxide films via ultrasonic spray pyrolysis: Investigation of physical properties post-annealing and their potential for TCO applications
(Elsevier, 2024) Güneş, İbrahim; Sarıca, Emrah; Bilgin, Vildan; Küçükarslan, Ayşe; Özder, Serhat
In this study, undoped tin oxide (SnO2) and fluorine (F)-doped SnO2 (FTO) films at various doping levels were deposited on glass substrates using the ultrasonic spray pyrolysis technique, followed by an annealing process applied to the films after deposition. In line with this, the study reveals the significant impact of the fluorine doping level optimization on certain physical properties such as the structural, optical, and electrical characteristics of the obtained films, and presents the consequences of the variation in these physical properties for adaptability in various optoelectronic applications. No diffraction peaks were observed in the X-ray diffraction patterns of the deposited films. After the annealing process, however, films with a polycrystalline form and a rutile tetragonal crystal structure were obtained. It was observed that the crystallization levels were better in films doped with 5 % and 10 % F. The optical band gap values of the films were determined to vary between 3.35 eV and 3.68 eV. Furthermore, it was found that with the increase in F doping level, the resistivity (ranging from 2.1 Omega cm to 43.5 Omega cm) and sheet resistance (ranging from 1.62x10(5) Omega/sq to 35.9x10(5) Omega/sq) values of the films decreased, while the figure of merit values (ranging from 0.12x10(-8) Omega(-1) to 67.1x10(-8) Omega(-1)) increased. Among all FTO films, it was revealed that films doped with 10 % F exhibited the highest optical transmittance, the lowest electrical resistivity, and the highest figure of merit values.
Fine-tuning SnO2 films: Unleashing their potential through deposition temperature optimization by ultrasonic spray pyrolysis
(Elsevier Sci Ltd, 2024) Sarıca, Emrah; Özcan, Hakan Bilal; Güneş, İbrahim; Terlemezoğlu, Makbule; Akyüz, İdris
In this study, the optimization of the deposition temperature, which directly affects the crystallinity, morphology, and electrical conductivity of SnO2 films deposited onto Corning Eagle XG glass substrates using the ultrasonic spray pyrolysis technique, was investigated to tailor their physical properties for various applications. Structural analyses revealed that the films had a tetragonal rutile structure, and while films deposited at lower temperatures exhibited a higher prevalence of (200) oriented planes, yet this decreased with an increase in deposition temperature. Morphological analyses showed that the films consisted of grains with octahedral shapes, and films deposited at lower temperatures were found to be more compact. The films had bandgap energy ranges between 3.96 eV and 4.02 eV. Hall effect measurements revealed that not only the carrier concentration decreased from 4.52 x 10(19) cm(-3) to 0.80 x 10(19) cm(-3), but the mobility also decreased from 23.32 cm(2)/Vs to 12.85 cm(2)/Vs. Among all the films, it was noted that the films deposited at 350 degrees C had the highest figure of merit which is 12.3 x 10(-4) Omega(-1). It can be concluded that the changes underlying these variations are associated with structural and morphological changes depending on the substrate temperature. Also, significant results have been attained in applications where precise control over crystal structure and surface morphology is crucial.
Soil quality indicators as influenced by 5-year diversified and monoculture cropping systems
(Cambridge Univ Press, 2020) Feng, H.; Abagandura, G. O.; Şentürklü, Songül; Landblom, D. G.; Lai, L.; Ringwall, K.; Kumar, S.
Increasing crop diversity has been highly recommended because of its environmental and economic benefits. However, the impacts of crop diversity on soil properties are not well documented. Thus, the present study was conducted to assess the impacts of crop diversity on selected soil quality indicators. The cropping systems investigated here included wheat (Triticum aestivum L.) grown continuously for 5 years as mono-cropping (MC), and a 5-year cropping sequence [(wheat-cover crop (CC)-corn (Zea mays L.)-pea (Pisum sativum L.) and barley (Hordeum vulgare L.)-sunflower (Helianthus annuus L.)]. Each crop was present every year. This study was conducted in the northern Great Plains of North America, and soil quality data were collected for 2016 and 2017. Selected soil quality indicators that include: soil pH, organic carbon (SOC), cold water-extractable C (CWC) and N (CWN), hot water-extractable C (HWC) and N (HWN), microbial biomass carbon (MBC), bulk density (BD), water retention (SWR), wet soil aggregate stability (WAS), and urease and beta-glucoside enzyme activity were measured after the completion of 5-year rotation cycle and the following year. Crop diversity did not affect soil pH, CWC, CWN, HWC, HWN and SWR. Cropping systems that contained CC increased SOC at shallow depths compared to the systems that did not have CC. Crop diversity increased WAS, MBC, and urease and beta-glucoside enzyme activity compared with the MC. Comparison of electrical conductivity (EC) measured in this study to the baseline values at the research site prior to the establishment of treatments revealed that crop rotation decreased EC over time. Results indicate that crop diversity can improve soil quality, thus promoting sustainable agriculture.
Response Surface Method Optimization of Hard Machining with Cryogenically Treated Cutting Tools: Surface Roughness, Cutting Force, Tool Wear, Rietveld Analysis, and Metallurgical Properties
(Wiley-V C H Verlag Gmbh, 2024) Kara, Fuat; Takmaz, Aysun; Erkan, Omer; Filiz, Serhat
The study consists of two stages: machinability tests and metallographic examinations. In the first stage of the study, response surface methodology (RSM) optimization was performed for the main-cutting-force (Fc) and average surface roughness (Ra) values obtained as a result of turning tests. In the second stage, the wear performance of cutting tool tips with and without deep cryogenic treatment was explained with the support of SEM images, EDX, XRD, and microhardness analyses. As a result of ANOVA analysis, it was found that the most effective parameter on Fc was the feed rate, with 78.89%. As a result of RSM-optimization, the lowest Fc value was found to be 339.99 N. The most effective parameter on Ra was found to be the feed rate at 69.38%. In terms of tool life, 15% and 11% improvements were achieved in uncoated and coated carbide cutting tools, respectively. As a result of Rieltveld's analysis, it was determined that cryogenic treatment increased the carbide percentages in the tools. As a result of microhardness measurements, it was observed that the hardness of uncoated and coated carbide tools increased by 4.6% and 5.15%, respectively, after cryogenic treatment.
Generalized linearly varying deceleration parameter solutions of higher dimensional universe in f(R,T) theory
(World Scientific Publ Co Pte Ltd, 2024) Çaglar, Halife
In this paper, generalized Friedmann-Robertson-Walker universe for Strange Quark Matter (SQM) and Normal Matter (NM) coupled with Domain Wall (DW) in form perfect fluid have been investigated in f(R,T) modified theory. f(R,T) function has been assumed as f(R,T)=R+mu T and Modified Field Equations (MEFEs) have been attained. The MEFEs of the constructed model do not allow solutions of open and closed FRW universe. Obtained modified field equations of higher dimensional flat FRW universe have been solved by using Linearly Varying Deceleration Parameter (LVDP) suggested by Akarsu and Dereli [Int. J. Theor. Phys. 51, 612 (2012)]. Pressure and energy density of the matter distributions for the Linearly Expansion Model (LEM) and Constant Expansion Model (CEM) have been attained as decreasing values by the cosmic time t and constant mu in f(R,T) gravity. But for the Exponential Expansion Model (XEM), these quantities have been obtained as time-independent. It is found out that the domain wall behaves like invisible matter when s1=0 due to negative domain wall tension (sigma(LSQM)(w)=-B-c) for SQM with DW of LEM. Strange quark matters for LDW and CDW models behave like cold dark matter when s(1)=0 and s(3)=0, respectively. One can say that SQM with DW for LEM and CEM may cause the expansion of the universe in these special situations. Also, solutions of XEM have shown that domain wall matter behaves like stiff matter when mu=20 pi. All solutions of the constructed model in f(R,T) theory have been reduced to General Relativity (GR) theory solutions by assuming mu=0. Finally, all solutions obtained have been discussed in detail.
The Effect of Fe and Co doping on the Physical Properties of CdO Films Deposited by Ultrasonic Spray Pyrolysis
(Springer, 2025) Demirselçuk, Barbaros; Güneş, İbrahim; Sarıca, Emrah; Kuş, Esra; Küçükarslan, Ayşe; Bilgin, Vildan
In this study, Cadmium Oxide (CdO) semiconductor films with different iron (Fe) and cobalt (Co) concentrations have been produced at 350 degrees C substrate temperature on the glass substrates by the ultrasonic spray pyrolysis method. In the first part of this study, the Fe element was doped in different ratios (2, 4, 6%) to CdO films, and the films were characterized. At the end of this stage, the optimum Fe doping ratio was determined for CdO films. In the second step, CdO films were dually doped with Fe + Co. The electrical resistivities of CdO:Fe films were determined using a four-probe technique to measure their conductivities, carrier concentrations, mobilities, and electrical conductivity types through Hall measurements. The produced films showed n-type electrical conductivity. It was determined that with increasing doping ratios, the electrical resistivity generally increased, and the films exhibited n-type conductivity. The XRD patterns revealed that the crystal structures of the films were polycrystalline and cubic in structure. The lections of (111), (200), (220), (311), and (222) planes were observed in the XRD patterns. Upon examination of the SEM images, it was observed that the films had nearly homogeneous surfaces and good adhesion to the substrate. By utilizing the fundamental absorption spectra of the films, it was determined that they exhibited direct bandgap transitions, and the bandgap energy values ranged from 2.34 to 2.65 eV. In the structural analysis, all films were found to have a polycrystalline structure and cubic CdO crystal system. When the SEM images of CdO:(Fe + Co) films were examined, it was observed that the films had almost homogeneous surfaces. Based on all these analyses, it was concluded that the doping elements Fe and Co significantly influenced the physical properties of CdO thin films.
New national and regional bryophyte records, 19
(Taylor & Francis Ltd, 2008) Blockeel, T. L.; Abay, G.; Bakalin, V. A.; Bednarek-ochyra, H.; Ochyra, R.; Çetin, B.; Cykowska, B.; Tonguç Yayıntaş, Özlem
[Anstract Not Available]
Bilimsel yönetim yaklaşımına psikanalitik bakış: Bir Taylor okuması
(2010) Erturgut, Ramazan; Soyşekerci, Serhat
Bu çalışma kuramsal analizin ötesinde zihinsel bir sorgulamaya dönüktür. Batıda belirli bir yönteme dayalı retorik olan çizgisel tarih perspektifine göre Taylor; tüm düşüncesi, yaşayış biçimi ve yönetim bilimine katkısı ile modernite tarafından kuşatıldığı için modern işletmeciliğin orijinidir. Bu yönüyle Taylorist Sistem sadece klasik yönetimin değil, modern yönetimin de içeriğini oluşturmaktadır. Öte yandan 20. yüzyılın başında mühendislik normları ile biçimlenen modern işletmecilik gibi modern tıp, 18. yüzyılın sonunda tarihsel olguların rasyonelliğinde geriye dönüşü olmayan yol içinde doğmuştur. Modern tıbbın hastalık kategorisi olarak tasarladığı takıntılı-saplantı ile Taylor 'un düşünüş sistemi arasında- koşutluk söz konusudur. Makale bu durumu hipotetik bir zemine oturtarak modernite ve rasyonellik olgusunun doğal bir sonucu olduğunu iddia etmektedir. Böylece Taylor okuması, sürekliliği gelişerek ilerlemeye dayalı farklı alanları kat edişin izlerini taşır.

Güncel Gönderiler