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BL-ALGEBRAS DEFINED BY AN OPERATOR
Tahsin Oner,Tugce Katican,Arsham Borumand Saeid 호남수학회 2022 호남수학학술지 Vol.44 No.2
In this paper, Sheffer stroke BL-algebra and its properties are investigated. It is shown that a Cartesian product of two Sheffer stroke BL-algebras is a Sheffer stroke BL-algebra. After describing a filter of Sheffer stroke BL-algebra, a congruence relation on a Sheffer stroke BL-algebra is defined via its filter, and quotient of a Sheffer stroke BL-algebra is constructed via a congruence relation. Also, it is defined a homomorphism between Sheffer stroke BL-algebras and is presented its properties. Thus, it is stated that the class of Sheffer stroke BL-algebras forms a variety.
Tahsin Atalay,Yavuz Köysal,Ali Ekber Özdemir,Engin Özbaş 한국정밀공학회 2018 International Journal of Precision Engineering and Vol.5 No.1
This paper investigates the effects of heat pipes filled with water and nanoparticles (MgO) on electricity generation. The experimental setup comprises of two-phase thermo-syphon heat pipes filled with water or MgO nanoparticle-water suspension, thermoelectric generator (TEG) modules and heat sinks that use passive and active cooling systems. Concentrated solar radiation with heat pipes was used as a heat source for heating. Specially constructed heat sinks with coolant tunnels were used for cooling. Heating and cooling processes are needed to create a temperature difference to generate electrical energy. The constructed model represents the influence of basic parameters such as the tilt angle of heat pipes, working fluids, cooling process, etc. on the maximum power generated. Systems in the constructed setup were arranged with a specific angle to the incident angle of solar radiation. The experiment was carried out on August 5th, 2015, in the northern coast of Turkey, city of Samsun with latitude of 41o14’ N. The results obtained show that the presented experimental setup can be used to evaluate thermoelectric energy potential of local areas or to investigate optimum cooling or heating processes.
Tahsin Atalay,Yusuf Yakut,Yavuz Köysal,Seyda Özbektaş,Hakan Bülbül,Bahattin Topaloğlu 한국정밀공학회 2022 International Journal of Precision Engineering and Vol.9 No.2
In this study, it is aimed to determine the energy generation capability of the designed and manufactured thermoelectric system when mounted on the two-axis solar tracking system. Thus, it was possible to compare the results obtained from current study with previous study. The system used in previous study was comprised of a thermoelectric generator (TEG) for energy conversion, a linear Fresnel lens for concentrating solar rays, and a one-axis tracking system to increase the electrical and thermal efficiency of the system. In this study, a dual-axis (two-axis) tracking system was used as a tracking system to examine the change in thermal and electrical efficiency. Therefore, experimental measurements were performed again using both two-axis and one-axis solar tracking systems on 16th October 2019 and 17th October 2019, respectively, at the location which falls at 41°14′ N and 36°26′ E. Additionally, the heat transfer and electricity generation performance of TEG was theoretically analyzed using CFD model. For this purpose, a numerical model consisting TEG with heat sink was developed. It was observed that the model data obtained and the experimental data were in good agreement. The values of parameters such as temperature, solar radiation, wind speed and TEG open circuit voltage were measured instantaneously during the measurements. The maximum open circuit voltages obtained is 1.02 and 1.13 V for one-axis and dual-axis systems, respectively. The solar radiation values were measured as 464 and 472 W∕m2 , respectively when the maximum open circuit voltages value is obtained. The duration for measurements was kept about 15 min so that the average values of these parameters were used in calculations. Thus, the values of maximum output power ( P maxout) , electrical efficiency (ηe) and Seebeck coefficient ( TEG) were calculated and given in the paper.
Enhanced thermoelectric properties of the SrTiO3 by Zr-doping with different doping level
Tamal Tahsin Khan,김일호,어순철 한양대학교 세라믹연구소 2018 Journal of Ceramic Processing Research Vol.19 No.4
The enhancement of the thermoelctric properties of the SrTiO3 by doping with Zr were investigated in our study. The ZrdopedSrTiO3 with different doping level were synthesized by the conventional solid-state reaction method. The formation ofsingle phase cubic perovskite structure and the changing behavior of the average grain size confirmed that the Zr-dopedSrTiO3 were prepared to control doping level. The thermoelctric properties including Seebeck coefficient, electricalconductivity, and thermal conductivity has been investigated in a moderate temperature regime from 300 K to 1000 K. Theabsolute value of Seebeck coefficient decreased and the electrical conductivity increased monotonically with increasing dopinglevel. The thermal conductivity decreased with increasing doping level. The power factor increased with increasing dopinglevel-up to x = 0.03 mole and the dimensionless figure of merit ZT, increased up to x = 0.03 mole of Zr. The maximum ZT valuewas observed for SrTi0.97Zr0.03O3 at 873 K.
Hasan Tahsin Öztürk,Erdem Turkeli,Ahmet Durmus 사단법인 한국계산역학회 2016 Computers and Concrete, An International Journal Vol.17 No.4
The main purpose of this study is to perform optimum cost design of cut and cover RC shallow tunnels using Artificial bee colony and genetic algorithms. For this purpose, mathematical expressions of objective function, design variables and constraints for the design of cut and cover RC shallow tunnels were determined. By using these expressions, optimum cost design of the Trabzon Kalekapısı junction underpass tunnel was carried out by using the cited algorithms. The results obtained from the algorithms were compared with the results obtained from traditional design and remarkable saving from the cost of the tunnel was achieved.
Optimum cost design of RC columns using artificial bee colony algorithm
Hasan Tahsin Ozturk,Ahmet Durmus 국제구조공학회 2013 Structural Engineering and Mechanics, An Int'l Jou Vol.45 No.5
Optimum cost design of columns subjected to axial force and uniaxial bending moment is presented in this paper. In the formulation of the optimum design problem, the height and width of the column, diameter and number of reinforcement bars are treated as design variables. The design constraints are implemented according to ACI 318-08 and studies in the literature. The objective function is taken as the cost of unit length of the column consisting the cost of concrete, steel, and shuttering. The solution of the design problem is obtained using the artificial bee colony algorithm which is one of the recent additions to metaheuristic techniques. The Artificial Bee Colony Algorithm is imitated the foraging behaviors of bee swarms. In application of this algorithm to the constraint problem, Deb's constraint handling method is used. Obtained results showed that the optimum value of numerical example is nearly same with the existing values in the literature.
Md Tahsin Khan,Araf Mahmud,Md. Muzahidul Islam,Mst. Sayedatun Nessa Sumaia,Zeaur Rahim,Kamrul Islam,Asif Iqbal Korea Genome Organization 2023 Genomics & informatics Vol.21 No.3
Mycobacterium tuberculosis (Mtb) is the causative agent of tuberculosis, one of the most deadly infections in humans. The emergence of multidrug-resistant and extensively drug-resistant Mtb strains presents a global challenge. Mtb has shown resistance to many frontline antibiotics, including rifampicin, kanamycin, isoniazid, and capreomycin. The only licensed vaccine, Bacille Calmette-Guerin, does not efficiently protect against adult pulmonary tuberculosis. Therefore, it is urgently necessary to develop new vaccines to prevent infections caused by these strains. We used a subtractive proteomics approach on 23 virulent Mtb strains and identified a conserved membrane protein (MmpL4, NP_214964.1) as both a potential drug target and vaccine candidate. MmpL4 is a non-homologous essential protein in the host and is involved in the pathogen-specific pathway. Furthermore, MmpL4 shows no homology with anti-targets and has limited homology to human gut microflora, potentially reducing the likelihood of adverse effects and cross-reactivity if therapeutics specific to this protein are developed. Subsequently, we constructed a highly soluble, safe, antigenic, and stable multi-subunit vaccine from the MmpL4 protein using immunoinformatics. Molecular dynamics simulations revealed the stability of the vaccine-bound Tolllike receptor-4 complex on a nanosecond scale, and immune simulations indicated strong primary and secondary immune responses in the host. Therefore, our study identifies a new target that could expedite the design of effective therapeutics, and the designed vaccine should be validated. Future directions include an extensive molecular interaction analysis, in silico cloning, wet-lab experiments, and evaluation and comparison of the designed candidate as both a DNA vaccine and protein vaccine.
Mustafa Tahsin Guler,Murat Inal,Ismail Bilican 한국공업화학회 2021 Journal of Industrial and Engineering Chemistry Vol.98 No.-
In this study, a new method for the fabrication of polydimethylsiloxane (PDMS) microchannels throughthe replication of plexiglass molds was developed. A plexiglass slab is machined with CO2 laser in theraster mode to produce the mold for the PDMS casting. Then, the PDMS replica of the mold is plasmabonded to a substrate by applying more pressure than standard to overcome the surface roughnessinherited from the laser machining process. Depending on the channel complexity, a ready to cast mold inthe size of a glass slide can be achieved in 5–20 min, including the design, machining, and cleaning steps. This fully automated and cost-effective mold making method proved to be the fastest among all methods,and it enables up to 2.5 aspect ratio microchannels, down to a width of 60 mm, and a height of 23 mm. Theraster mode of the laser provides features lower, in size, then the laser beam waist radius. The producedmicrochannels were validated using several applications, such as droplet generation, nanofiberproduction, and viscoelastic microparticle focusing.