Ebru Uzun, Doç. Dr. Barbaros Balabanli, Ş. C. Cevher
The fundamental reasons for delayed wound healing in diabetic animals include inadequate production of growth factors or their increased devastation. Vascular Growth Factor (VEGF) has a biological role in the healing process of mucosal and skin wounds, especially in the process of new vessel formation. We planned to examine the oxidant-antioxidant events that occur during healing with topical VEGF application in diabetic rats. Experiments were performed 36 adults female Wistar albino rat diabetes induced by streptozotocin. The incisional wounds were made on the dorsal region in the rats. Rats were separated to 3 groups: the untreated (negative control) group (n=12), the chitosan group (n=12), the chitosan + VEGF group (n=12). The treatments were continued for 3 and 7 days, excluding the control and negative control groups. Then, the animals were sacrificed on the 3rd and 7th days of wound healing. Antioxidant and oxidant parameters in skin tissue were measured using biochemical methods. Topical VEGF application was decreased the NOx levels on the 3rd day compared to other groups. Moreover, it increased wound tissue GSH and AA levels, subsequently contributing to the enhance tissue antioxidant capacity. In conclusion, VEGF application increases the antioxidant capacity of the tissue and simultaneously reduces the oxidative stress and thus gives a positive acceleration to the wound healing process.
{"title":"Vascular Endothelial Growth Factor Supplementation Enhance Skin Antioxidant Capacity in Hyperglycemic Rats","authors":"Ebru Uzun, Doç. Dr. Barbaros Balabanli, Ş. C. Cevher","doi":"10.35378/gujs.1082697","DOIUrl":"https://doi.org/10.35378/gujs.1082697","url":null,"abstract":"The fundamental reasons for delayed wound healing in diabetic animals include inadequate production of growth factors or their increased devastation. Vascular Growth Factor (VEGF) has a biological role in the healing process of mucosal and skin wounds, especially in the process of new vessel formation. We planned to examine the oxidant-antioxidant events that occur during healing with topical VEGF application in diabetic rats. Experiments were performed 36 adults female Wistar albino rat diabetes induced by streptozotocin. The incisional wounds were made on the dorsal region in the rats. Rats were separated to 3 groups: the untreated (negative control) group (n=12), the chitosan group (n=12), the chitosan + VEGF group (n=12). The treatments were continued for 3 and 7 days, excluding the control and negative control groups. Then, the animals were sacrificed on the 3rd and 7th days of wound healing. Antioxidant and oxidant parameters in skin tissue were measured using biochemical methods. Topical VEGF application was decreased the NOx levels on the 3rd day compared to other groups. Moreover, it increased wound tissue GSH and AA levels, subsequently contributing to the enhance tissue antioxidant capacity. In conclusion, VEGF application increases the antioxidant capacity of the tissue and simultaneously reduces the oxidative stress and thus gives a positive acceleration to the wound healing process.","PeriodicalId":12615,"journal":{"name":"gazi university journal of science","volume":"1 1","pages":""},"PeriodicalIF":0.9,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"69795820","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
In this research, the numerical integral method procedure on uniform mesh is used to solve the singularly perturbed problem which has integral boundary value. This method also includes the trapezoid method, the finite difference method, and the Thomas algorithm. The problem is converted to finite difference problem by using finite difference approximations and trapezoid method. Finally, the convergence of the presented method is analyzed through sample application. Thus, the correctness and sufficiency of the method are shown.
{"title":"The Approximate Solution of Singularly Perturbed Burger-Huxley Equation with RDTM","authors":"D. Arslan","doi":"10.35378/gujs.935885","DOIUrl":"https://doi.org/10.35378/gujs.935885","url":null,"abstract":"In this research, the numerical integral method procedure on uniform mesh is used to solve the singularly perturbed problem which has integral boundary value. This method also includes the trapezoid method, the finite difference method, and the Thomas algorithm. The problem is converted to finite difference problem by using finite difference approximations and trapezoid method. Finally, the convergence of the presented method is analyzed through sample application. Thus, the correctness and sufficiency of the method are shown.","PeriodicalId":12615,"journal":{"name":"gazi university journal of science","volume":"1 1","pages":""},"PeriodicalIF":0.9,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"69796523","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Hamit Erdal, Kemal Gürol Kurtay, Hakan Ayhan Dagistanli
Crime is a phenomenon that disrupts the welfare and structure of society and has become an important problem in both developed and developing countries. In recent years, in parallel with the increasing rate of urbanization all over the world, there has been also a serious increase in crime rates. With the increasing crime rates, the fear of crime has emerged in the individuals who are part of the society. Fear of crime is the degree of anxiety an individual feels about the deterioration of the social structure. This degree of anxiety is expressed by crime and safety indices today. In this study, a new measurement tool is proposed in order to eliminate the effects such as emotional preference, decision-making difficulty, etc. For this purpose, the Stochastic Multi-Criteria Acceptability Analysis-TRI (SMAA-TRI) method, in which the measurement can be made with interval and dispersed values, and the probability theory can be reflected as an effect on the decision analysis, has been utilized to measure the crime and safety indices, determined by online survey up to now, because of the fact that the experts/participants had difficulties in expressing their preferences clearly during their evaluations. It has been determined that the index values obtained as a result of the study coincide with the results of the surveys made with thousands of people and that the SMAA-TRI method can be used effectively in determining the crime/safety indices.
{"title":"Suggesting A Stochastic Measurement Tool for Determining Crime and Safety Indexes: Evidence from Turkey","authors":"Hamit Erdal, Kemal Gürol Kurtay, Hakan Ayhan Dagistanli","doi":"10.35378/gujs.1110735","DOIUrl":"https://doi.org/10.35378/gujs.1110735","url":null,"abstract":"Crime is a phenomenon that disrupts the welfare and structure of society and has become an important problem in both developed and developing countries. In recent years, in parallel with the increasing rate of urbanization all over the world, there has been also a serious increase in crime rates. With the increasing crime rates, the fear of crime has emerged in the individuals who are part of the society. Fear of crime is the degree of anxiety an individual feels about the deterioration of the social structure. This degree of anxiety is expressed by crime and safety indices today. In this study, a new measurement tool is proposed in order to eliminate the effects such as emotional preference, decision-making difficulty, etc. For this purpose, the Stochastic Multi-Criteria Acceptability Analysis-TRI (SMAA-TRI) method, in which the measurement can be made with interval and dispersed values, and the probability theory can be reflected as an effect on the decision analysis, has been utilized to measure the crime and safety indices, determined by online survey up to now, because of the fact that the experts/participants had difficulties in expressing their preferences clearly during their evaluations. It has been determined that the index values obtained as a result of the study coincide with the results of the surveys made with thousands of people and that the SMAA-TRI method can be used effectively in determining the crime/safety indices.","PeriodicalId":12615,"journal":{"name":"gazi university journal of science","volume":" ","pages":""},"PeriodicalIF":0.9,"publicationDate":"2022-12-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44287244","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
In machine scheduling problems, not all machines are always available. They may be interrupted periodically for reasons such as planned maintenance, lunch and rest breaks. However, this situation is often ignored in the literature or these time periods are considered as fixed. In this study, flow shop scheduling problem with unavailable time periods is discussed. In the considered problem, unavailable time periods are not fixed, they can be pulled forward to prevent the idle times. A MIP model and a genetic algorithm have been developed for the considered problem. The performance of the proposed solution methods is demonstrated using randomly generated test problems. With the developed genetic algorithm, GAMS results are improved by an average of 26,82%.
{"title":"A Hybrid Algorithm for Flow Shop Scheduling Problem with Unavailable Time Periods and Additional Resources","authors":"F. Özçeli̇k, T. Saraç","doi":"10.35378/gujs.1108155","DOIUrl":"https://doi.org/10.35378/gujs.1108155","url":null,"abstract":"In machine scheduling problems, not all machines are always available. They may be interrupted periodically for reasons such as planned maintenance, lunch and rest breaks. However, this situation is often ignored in the literature or these time periods are considered as fixed. In this study, flow shop scheduling problem with unavailable time periods is discussed. In the considered problem, unavailable time periods are not fixed, they can be pulled forward to prevent the idle times. A MIP model and a genetic algorithm have been developed for the considered problem. The performance of the proposed solution methods is demonstrated using randomly generated test problems. With the developed genetic algorithm, GAMS results are improved by an average of 26,82%.","PeriodicalId":12615,"journal":{"name":"gazi university journal of science","volume":" ","pages":""},"PeriodicalIF":0.9,"publicationDate":"2022-12-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49036462","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Estimating effects of drugs at different stages is directly proportional to the duration of recovery and duration of pulling through with the disease. For this reason, solving Pharmacokinetic models that investigate these effects is very important. In this study, numerical solutions of this type of one, two and three compartment nonlinear Pharmacokinetic models have been studied. Distributed order differential equations are used for the solution of the model. Numerical solutions have been found with the density function contained in distributed order differential equations and different values of this function. A Nonstandard finite difference scheme has been used for numerical solutions. Finally, stability analysis of equilibrium points of obtained discretized system has also been expressed with the help of the Schur-Cohn criteria.
{"title":"Discretization and Stability Analysis for a Generalized Type Nonlinear Pharmacokinetic Models","authors":"M. Kocabiyik, Mevlüde YAKIT ONGUN","doi":"10.35378/gujs.1027381","DOIUrl":"https://doi.org/10.35378/gujs.1027381","url":null,"abstract":"Estimating effects of drugs at different stages is directly proportional to the duration of recovery and duration of pulling through with the disease. For this reason, solving Pharmacokinetic models that investigate these effects is very important. In this study, numerical solutions of this type of one, two and three compartment nonlinear Pharmacokinetic models have been studied. Distributed order differential equations are used for the solution of the model. Numerical solutions have been found with the density function contained in distributed order differential equations and different values of this function. A Nonstandard finite difference scheme has been used for numerical solutions. Finally, stability analysis of equilibrium points of obtained discretized system has also been expressed with the help of the Schur-Cohn criteria.","PeriodicalId":12615,"journal":{"name":"gazi university journal of science","volume":" ","pages":""},"PeriodicalIF":0.9,"publicationDate":"2022-12-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44032004","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
This article presents the buckling behavior of carbon nanotubes reinforced sandwich-structured composite shells supported by elastic foundations. The sandwich-structured configuration is composed of three layers, an isotropic core, and two nanocomposite face sheets. Carbon nanotubes fibers are applied to reinforce nanocomposite face sheets of sandwich composite shells. It is assumed that the distribution of reinforcements across the shell thickness is uniform or functionally graded. Under the assumption of the thin shell, the equilibrium equation of the buckling response of CNT-RSSC shells is obtained. The pre-buckling stresses by applying Airy’s stress function and an adjacent equilibrium criterion to establish the stability equation associated with the buckling state are obtained. The effects of different types of CNTs' reinforcement, volume fractions, geometrical parameters, core to face sheet thickness ratio, and elastic foundations on the mechanical buckling analysis are examined.
{"title":"Analytical modeling of buckling of carbon nanotubes reinforced sandwich-structured composite shells resting on elastic foundations","authors":"A. Timesli","doi":"10.35378/gujs.998265","DOIUrl":"https://doi.org/10.35378/gujs.998265","url":null,"abstract":"This article presents the buckling behavior of carbon nanotubes reinforced sandwich-structured composite shells supported by elastic foundations. The sandwich-structured configuration is composed of three layers, an isotropic core, and two nanocomposite face sheets. Carbon nanotubes fibers are applied to reinforce nanocomposite face sheets of sandwich composite shells. It is assumed that the distribution of reinforcements across the shell thickness is uniform or functionally graded. Under the assumption of the thin shell, the equilibrium equation of the buckling response of CNT-RSSC shells is obtained. The pre-buckling stresses by applying Airy’s stress function and an adjacent equilibrium criterion to establish the stability equation associated with the buckling state are obtained. The effects of different types of CNTs' reinforcement, volume fractions, geometrical parameters, core to face sheet thickness ratio, and elastic foundations on the mechanical buckling analysis are examined.","PeriodicalId":12615,"journal":{"name":"gazi university journal of science","volume":" ","pages":""},"PeriodicalIF":0.9,"publicationDate":"2022-12-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43783134","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Glazed curtain wall systems have become indispensable particularly in office buildings due to their light weight, aesthetic appearance, easy installation and resistance to climate conditions. Curtain walls however, also have problems in terms of thermal efficiency because of their wide, glazing windows and metal frames that have high thermal conductivity. The aim of this study is to offer proposals for improving the thermal performance of an office building with a glass curtain wall system built in a hot-humid climate zone. An office building constructed in Antalya, Turkey was modelled with the help of DesignBuilder energy simulation software and various modifications were made on the model in order to improve the thermal performance of the building. With the improvements proposed in the study, it is possible to decrease the annual thermal loads of the whole building by 6.6%, and the annual thermal loads of the space with the curtain wall by 33.2%. The study revealed that, applying an additional envelope is more effective than lowering the U-value of the glass of the curtain wall in terms of thermal performance improvement.
{"title":"Recommendations for Improvement of the Thermal Performance of an Office Building Based on Retrofitting the Glazed Curtain Wall","authors":"Neşe Di̇kmen, Canan Altundaş","doi":"10.35378/gujs.997496","DOIUrl":"https://doi.org/10.35378/gujs.997496","url":null,"abstract":"Glazed curtain wall systems have become indispensable particularly in office buildings due to their light weight, aesthetic appearance, easy installation and resistance to climate conditions. Curtain walls however, also have problems in terms of thermal efficiency because of their wide, glazing windows and metal frames that have high thermal conductivity. The aim of this study is to offer proposals for improving the thermal performance of an office building with a glass curtain wall system built in a hot-humid climate zone. An office building constructed in Antalya, Turkey was modelled with the help of DesignBuilder energy simulation software and various modifications were made on the model in order to improve the thermal performance of the building. With the improvements proposed in the study, it is possible to decrease the annual thermal loads of the whole building by 6.6%, and the annual thermal loads of the space with the curtain wall by 33.2%. The study revealed that, applying an additional envelope is more effective than lowering the U-value of the glass of the curtain wall in terms of thermal performance improvement.","PeriodicalId":12615,"journal":{"name":"gazi university journal of science","volume":" ","pages":""},"PeriodicalIF":0.9,"publicationDate":"2022-12-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46020440","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
In this study, powder metal samples of 15x15x4 mm dimensions of Fe powders were produced at different pressures (650,850,1050 MPa) and were sintered in atmospheric environment with the help of resistance sintering method applied for the first time using electric resistance welding. The sintered and green densities of the powder metal samples were measured and their sinterability in the unprotected environment was examined. Powder metal specimens were sintered successfully with the electric resistance welding technique in an unprotected environment and high density values such as 98% were obtained. In addition, the effects of electric resistance heating technique on sintering were investigated by performing hardness analysis and microscopic examination of sintered samples.
{"title":"Sintering of Iron Powders by Resistance Heating Technique","authors":"F. Atar, A. Kurt","doi":"10.35378/gujs.1003395","DOIUrl":"https://doi.org/10.35378/gujs.1003395","url":null,"abstract":"In this study, powder metal samples of 15x15x4 mm dimensions of Fe powders were produced at different pressures (650,850,1050 MPa) and were sintered in atmospheric environment with the help of resistance sintering method applied for the first time using electric resistance welding. The sintered and green densities of the powder metal samples were measured and their sinterability in the unprotected environment was examined. Powder metal specimens were sintered successfully with the electric resistance welding technique in an unprotected environment and high density values such as 98% were obtained. In addition, the effects of electric resistance heating technique on sintering were investigated by performing hardness analysis and microscopic examination of sintered samples.","PeriodicalId":12615,"journal":{"name":"gazi university journal of science","volume":" ","pages":""},"PeriodicalIF":0.9,"publicationDate":"2022-12-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45843692","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
In this study, definitions of Weld Penetration (WP), Depth of Fusion (DOF) and Throat Thickness (TT) in fillet welds according to related standards are reviewed. WP, DOF and TT are crucial dimensions for welded joints since these values determine the weld quality. In AWS A3.0, ISO2553, Eurocode EN 1993-1-8 and DIN EN ISO 17659, these terms are defined, explained and shown in figures. Each standard makes its own definition related with WP, DOF and TT. Moreover, when looking at these standards, it is seen that definitions are always made in terms of unit of length. In some studies, assessment of fusion or penetration (FOP) rate on fillet welds is performed as the ratio of the maximum FOP depth to the material thickness. Depth assessment taking into consideration unit of length is not ideal for accurate evaluation of FOP rates especially on fillet welds. Method taking into consideration unit of area will be more suitable as it allows accurate assessment of FOP rates in welded joints. In this review, it is also suggested that the evaluation of FOP rate on fillet welds should be determined in terms of unit of area rather than length.
本文综述了相关标准对角焊缝熔深(WP)、熔深(DOF)和喉道厚度(TT)的定义。WP, DOF和TT是焊接接头的关键尺寸，因为这些值决定了焊接质量。在AWS A3.0、ISO2553、欧洲规范EN 1993-1-8和DIN EN ISO 17659中，这些术语用图表进行了定义、解释和显示。每个标准对WP、DOF和TT都有自己的定义。此外，当查看这些标准时，可以看到定义总是根据长度单位进行的。在一些研究中，用最大熔透深度与材料厚度之比来评估角焊缝的熔透率。考虑长度单位的深度评估对于准确评估FOP率并不理想，尤其是在角焊缝上。考虑面积单位的方法更合适，因为它可以准确地评估焊接接头的FOP率。在这篇综述中，还建议评价角焊缝的FOP率应以单位面积而不是长度来确定。
{"title":"Review of the Definition of Weld Penetration, Depth of Fusion and Throat Thickness on Fillet Welds","authors":"Umut Yaşar Uzunali, H. Çuvalcı","doi":"10.35378/gujs.1137178","DOIUrl":"https://doi.org/10.35378/gujs.1137178","url":null,"abstract":"In this study, definitions of Weld Penetration (WP), Depth of Fusion (DOF) and Throat Thickness (TT) in fillet welds according to related standards are reviewed. WP, DOF and TT are crucial dimensions for welded joints since these values determine the weld quality. In AWS A3.0, ISO2553, Eurocode EN 1993-1-8 and DIN EN ISO 17659, these terms are defined, explained and shown in figures. Each standard makes its own definition related with WP, DOF and TT. Moreover, when looking at these standards, it is seen that definitions are always made in terms of unit of length. In some studies, assessment of fusion or penetration (FOP) rate on fillet welds is performed as the ratio of the maximum FOP depth to the material thickness. Depth assessment taking into consideration unit of length is not ideal for accurate evaluation of FOP rates especially on fillet welds. Method taking into consideration unit of area will be more suitable as it allows accurate assessment of FOP rates in welded joints. In this review, it is also suggested that the evaluation of FOP rate on fillet welds should be determined in terms of unit of area rather than length.","PeriodicalId":12615,"journal":{"name":"gazi university journal of science","volume":" ","pages":""},"PeriodicalIF":0.9,"publicationDate":"2022-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48735302","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
In this study, hydrogen diffusion profiles of different metallic materials were investigated. To model hydrogen diffusion, 1D and 2D mass diffusion models were prepared in MATLAB. Iron, nickel and titanium were selected as a material of choice to represent body-centered cubic, face-centered cubic, and hexagonal closed paced crystal structures, respectively. In addition, hydrogen back diffusion profiles were also modeled after certain baking times. Current results reveal that hydrogen diffusion depth depends on the microstructure, energy barrier model, temperature, and charging time. In addition, baking can help for back diffusion of hydrogen and can be utilized as hydrogen embrittlement prevention method. Since hydrogen diffusion is very crucial step to understand and evaluate hydrogen embrittlement, current set of results constitutes an important guideline for hydrogen diffusion calculations and ideal baking time for hydrogen back diffusion for different materials. Furthermore, these results can be used to evaluate hydrogen content inside the material over expensive and hard to find experimental facilities such as, thermal desorption spectroscopy.
{"title":"Investigation of Hydrogen Diffusion Profile of Different Metallic Materials for a Better Understanding of Hydrogen Embrittlement","authors":"M. F. Kapci, B. Bal","doi":"10.35378/gujs.1090824","DOIUrl":"https://doi.org/10.35378/gujs.1090824","url":null,"abstract":"In this study, hydrogen diffusion profiles of different metallic materials were investigated. To model hydrogen diffusion, 1D and 2D mass diffusion models were prepared in MATLAB. Iron, nickel and titanium were selected as a material of choice to represent body-centered cubic, face-centered cubic, and hexagonal closed paced crystal structures, respectively. In addition, hydrogen back diffusion profiles were also modeled after certain baking times. Current results reveal that hydrogen diffusion depth depends on the microstructure, energy barrier model, temperature, and charging time. In addition, baking can help for back diffusion of hydrogen and can be utilized as hydrogen embrittlement prevention method. Since hydrogen diffusion is very crucial step to understand and evaluate hydrogen embrittlement, current set of results constitutes an important guideline for hydrogen diffusion calculations and ideal baking time for hydrogen back diffusion for different materials. Furthermore, these results can be used to evaluate hydrogen content inside the material over expensive and hard to find experimental facilities such as, thermal desorption spectroscopy.","PeriodicalId":12615,"journal":{"name":"gazi university journal of science","volume":"1 1","pages":""},"PeriodicalIF":0.9,"publicationDate":"2022-11-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"69795962","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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