gazi university journal of science最新文献_第7页

Low-Cost Alpha Cabin Like Test Box Proposal for the Development of New Acoustic Sound Insulation Materials 开发新型隔音材料的低成本Alpha舱样试验箱方案

gazi university journal of science Pub Date : 2023-03-01 DOI: 10.35378/gujs.1010472

Hatice Mehtap BULUKLU, Filiz BAL KOÇYİĞİT, Ercan KÖSE

{"title":"Low-Cost Alpha Cabin Like Test Box Proposal for the Development of New Acoustic Sound Insulation Materials","authors":"Hatice Mehtap BULUKLU, Filiz BAL KOÇYİĞİT, Ercan KÖSE","doi":"10.35378/gujs.1010472","DOIUrl":"https://doi.org/10.35378/gujs.1010472","url":null,"abstract":"Experimental criteria for sound insulation material recommendation and design have an important share in indoor acoustic control. Among these criteria, laboratories with devices such as impedance tubes, alpha cabins and reverberation rooms used to measure and analyze parameters such as sound transmission loss and sound absorption coefficient have been investigated. In literature, it has been observed that there are studies on acoustic materials and the tests applied to these materials, but the application is more limited. According to research data, an Alpha Cabin model system design that can be used to develop new types of acoustic sound materials has been proposed. In addition to the fact that a large number of experimental measurements can be performed at lower costs using the designed Alpha Cabin model system, many tests can be performed easily for different material designs in a very short time. To perform these tests, the Alpha Cabin system has been designed based on noise and sound insulation. For example, floating flooring, ribbed connection, and so on. Afterward, different insulation materials were used for insulation purposes and standards were achieved. The Alpha Cabin test system, which was designed and developed, overlaps the experimental and theoretical data for 500, 2000, and 4000 Hz when compared with the values of 29.1 dB for 500 Hz, 38.6 dB for 2000 Hz, and 49 dB for 4000 Hz measured in the Acoustic Facade Panel Test Room, and it has been observed that it can be used in the development of new sound insulation materials.","PeriodicalId":12615,"journal":{"name":"gazi university journal of science","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136131247","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}

引用次数: 0

The Production of Hollow Nanofibers from PBS / TPU Blends by Coaxial Electrospinning Method 同轴静电纺丝法由PBS/TPU共混物制备中空纳米纤维

IF 0.9

gazi university journal of science Pub Date : 2023-02-15 DOI: 10.35378/gujs.1199571

Hatice Bilge İşgen, Sema Samatya Yılmaz, Ayse Aytac

{"title":"The Production of Hollow Nanofibers from PBS / TPU Blends by Coaxial Electrospinning Method","authors":"Hatice Bilge İşgen, Sema Samatya Yılmaz, Ayse Aytac","doi":"10.35378/gujs.1199571","DOIUrl":"https://doi.org/10.35378/gujs.1199571","url":null,"abstract":"In this study, the production of hollow Polybutylene Succinate (PBS)/Thermoplastic Polyurethane (TPU) nanofibers as biodegradable nanomaterials with improved mechanical properties were carried out by coaxial electrospinning method. The polymer solutions of pure PBS, pure TPU, and PBS/TPU blends (60/40, 40/60, 20/80 w/w) (as the shell) versus pure Polyvinylpyrrolidone (PVP) (as core) were put together for bi-component nanofibers production. The core structure of nanofibers was dissolved in distilled water. Thus, hollow nanofibers were obtained with the removal of PVP from the structure. Characterization studies (SEM, FTIR, and Tensile tests) of hollow nanofibers were performed. The morphological properties of PBS/TPU blends in ratios of 60/40 and 20/80 were observed as homogeneous and non-adhered fiber structures. It was determined that the hollow PBS/TPU (60/40) mat has the thinnest nanofibers. New bond formations within the interactions of substances as studied in the chemistry of blended electrospun webs were examined with FTIR analysis. Therewithal, this test showed the removal of PVP in the core of all nanofibers. It was observed that the adhered fibers increased the tensile stress and decreased the tensile strain at mechanical test results that were verified also by SEM views. It is suggested that the hollow nanofibers produced by this study can be used in the biomedical field as a biodegradable and breathable wound dressing","PeriodicalId":12615,"journal":{"name":"gazi university journal of science","volume":null,"pages":null},"PeriodicalIF":0.9,"publicationDate":"2023-02-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49224708","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}

引用次数: 0

Detection of COVID-19 Disease with Machine Learning Algorithms from CT Images 利用机器学习算法从CT图像中检测新冠肺炎疾病

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gazi university journal of science Pub Date : 2023-02-14 DOI: 10.35378/gujs.1150388

Mahmut Nedim Ekersular, A. Alkan

{"title":"Detection of COVID-19 Disease with Machine Learning Algorithms from CT Images","authors":"Mahmut Nedim Ekersular, A. Alkan","doi":"10.35378/gujs.1150388","DOIUrl":"https://doi.org/10.35378/gujs.1150388","url":null,"abstract":"With the identification of the SARS-COV-2 virus in November 2019, the world has become very different. The COVID-19 disease caused by the virus has reached epidemic proportions and continues. This virus, which is one of the most contagious and deadly pathogens in human history with the number of cases approaching 600 million and the number of deaths exceeding 6 million, has shown and continues to show itself in every area that people come into contact with, from business life to economy, transportation to education, social life to psychology. Although the developed vaccines provide a partial decrease in the number of deaths, the mutations that the virus constantly undergoes and the increase in the transmission rate accordingly reduce the effectiveness of the vaccines, and the number of deaths tends to increase as the number of infected people. It is undoubtedly important that the detection of this epidemic disease, which is the biggest crisis that humanity has experienced in the last century after World War II, is carried out accurately and quickly. In this study, a machine learning-based artificial intelligence method has been proposed for the detection of COVID-19 from computed tomography images. The features of images with two classes are extracted using the Local Binary Pattern. The images reserved for training in the dataset were used for training machine learning models. Trained models were tested with previously unused test images. While the Fine K-Nearest Neighbors model reached the highest accuracy with a value of 0.984 for the training images, the highest accuracy value was obtained by the Cubic Support Vector Machine with 0.93 for the test images. These results are higher than the deep learning-based study using the same data set.","PeriodicalId":12615,"journal":{"name":"gazi university journal of science","volume":null,"pages":null},"PeriodicalIF":0.9,"publicationDate":"2023-02-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42343601","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}

引用次数: 0

Accumulation of Heavy Metals and Determination of Natural Radioactivity in the Soil-Thyme System in Omerli, Istanbul: Assessment of Ecological and Health Risk 伊斯坦布尔奥马利土壤Thyme系统中重金属的积累和天然放射性的测定：生态和健康风险评估

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gazi university journal of science Pub Date : 2023-02-14 DOI: 10.35378/gujs.1150020

A. N. Esen, A. Azbouche, S. Haciyakupoğlu, Sema Erentürk, Zaida Melzi̇

{"title":"Accumulation of Heavy Metals and Determination of Natural Radioactivity in the Soil-Thyme System in Omerli, Istanbul: Assessment of Ecological and Health Risk","authors":"A. N. Esen, A. Azbouche, S. Haciyakupoğlu, Sema Erentürk, Zaida Melzi̇","doi":"10.35378/gujs.1150020","DOIUrl":"https://doi.org/10.35378/gujs.1150020","url":null,"abstract":"Transfer of metals from soil to plant is an important pathway of human exposure to environmental contaminants. In this study accumulation of different metals was investigated and natural radioactivity levels were measured in the soil–thyme system. Results showed that the concentration of Br, Cr, Mn, Ni, and Pb in the soil is higher than the World average value, and P, Ca, and Zn have higher transfer factors. The natural radioactivity level in the soils is similar to the World average. For thyme samples the average values for 226Ra, 232Th and 40K were found as 22.7 Bqkg-1, 61.3 Bqkg-1 and 722 Bqkg-1, respectively. The health and ecological risks of soil were evaluated. The total hazard index of the child was 1.453 on average, greater than that of the adult (0.175), primarily due to the contribution of Cr. Ecological risk assessed based on various indices indicated that Pb and Ni show contamination risk to the environment. Our study confirms that metals in soil influence metals in plants, and those metal interactions are critical for pollution risk control.","PeriodicalId":12615,"journal":{"name":"gazi university journal of science","volume":null,"pages":null},"PeriodicalIF":0.9,"publicationDate":"2023-02-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49563307","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}

引用次数: 0

Fabrication and Performance of a Perovskite Solar Cell: Effect of Acetylacetone on Compact TiO2 Layer 钙钛矿太阳能电池的制备与性能:乙酰丙酮对TiO2致密层的影响

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gazi university journal of science Pub Date : 2023-01-11 DOI: 10.35378/gujs.1176183

B. Kaya, İ. Boz, Mehtap ŞAFAK BOROĞLU

{"title":"Fabrication and Performance of a Perovskite Solar Cell: Effect of Acetylacetone on Compact TiO2 Layer","authors":"B. Kaya, İ. Boz, Mehtap ŞAFAK BOROĞLU","doi":"10.35378/gujs.1176183","DOIUrl":"https://doi.org/10.35378/gujs.1176183","url":null,"abstract":"Solar energy has been the most emphasized issue in recent years, as it is sustainable and causes zero emissions. Solar cells are of interest because they convert sunlight into electricity through photovoltaic effects. Over the last ten years, the efficiency of perovskite solar cells has achieved 25% due to the development of synthesis techniques and electrode materials etc. The electron transport layer, a hole transport layer their thickness and structure of surface etc. act an important role in improving the performance of perovskite solar cells. We have investigated the effect of the acid-assisted route and the acetylacetone-assisted (AA) route on TiO2 films and thus the effect of the efficiency of perovskite solar cells. Perovskite (CH3NH3PbI3) solar cells based on different c-TiO2 have been fabricated by the spin coating route, and the overall experimental section is made in the nitrogen medium at room temperature. Cracked c-TiO2 film obtained via the acid-assisted route. The planar heterojunction structure of ITO/AA-TiO2/CH3NH3PbI3/P3HT/Ag resulted 0.03% of power conversion efficiency (PCE). However, the perovskite solar cells with a mesoporous heterojunction structure of ITO/ AA-TiO2/m- TiO2 /CH3NH3PbI3/P3HT/Ag resulted 0.1% of PCE.","PeriodicalId":12615,"journal":{"name":"gazi university journal of science","volume":null,"pages":null},"PeriodicalIF":0.9,"publicationDate":"2023-01-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"69795700","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}

引用次数: 0

Analytical Investigation of Microcrystalline Wood Charcoal Reinforced Polyester Composites Using ED-XRF, FTIR and SEM-EDS Techniques 微晶木炭增强聚酯复合材料的xrd、FTIR和SEM-EDS分析研究

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gazi university journal of science Pub Date : 2023-01-10 DOI: 10.35378/gujs.794837

Francis Edoziuno, R. Akaluzia

{"title":"Analytical Investigation of Microcrystalline Wood Charcoal Reinforced Polyester Composites Using ED-XRF, FTIR and SEM-EDS Techniques","authors":"Francis Edoziuno, R. Akaluzia","doi":"10.35378/gujs.794837","DOIUrl":"https://doi.org/10.35378/gujs.794837","url":null,"abstract":"Polyester based particle reinforced composites were developed using varying weight fractions (ranging from 0 to 30 wt%, at 5 wt% interval) of microcrystalline wood charcoal powder (75µm). Quantitative, qualitative and functional characterization of developed wood charcoal (WC) particles reinforced polyester matrix composites was carried out successfully using energy dispersive x-ray spectrophotometer (EDXRF), Fourier transform infrared spectrometer (FTIR) and scanning electron microscope (SEM) enhanced with ancillary EDS for elemental identification capability. The primary elements and oxides identified in wood charcoal by EDXRF include iron, copper, zinc, calcium and CaO, Fe2O3, CuO, ZnO respectively. These elements and oxides were noted to induce improvement on the properties of reinforced polymer composites. EDS elemental mapping also confirmed the major elements identified by EDXRF analysis. Composites reinforced with microcrystalline wood charcoal exhibited strong interfacial bonding and interlocking due to even dispersion of the filler particles as revealed by SEM images. Interactions of the microcrystalline wood charcoal fillers with the polyester matrix molecules were revealed by FTIR functional characterization as minor shifts in the frequency bands of functional groups normally present in unsaturated polyester resin.","PeriodicalId":12615,"journal":{"name":"gazi university journal of science","volume":null,"pages":null},"PeriodicalIF":0.9,"publicationDate":"2023-01-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41559659","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}

引用次数: 0

Vascular Endothelial Growth Factor Supplementation Enhance Skin Antioxidant Capacity in Hyperglycemic Rats 补充血管内皮生长因子提高高血糖大鼠皮肤抗氧化能力

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gazi university journal of science Pub Date : 2023-01-01 DOI: 10.35378/gujs.1082697

Ebru Uzun, Doç. Dr. Barbaros Balabanli, Ş. C. Cevher

{"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":null,"pages":null},"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}

引用次数: 2

The Approximate Solution of Singularly Perturbed Burger-Huxley Equation with RDTM 奇异摄动Burger-Huxley方程的近似解

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gazi university journal of science Pub Date : 2023-01-01 DOI: 10.35378/gujs.935885

D. Arslan

引用次数: 0

Suggesting A Stochastic Measurement Tool for Determining Crime and Safety Indexes: Evidence from Turkey 提出一种确定犯罪和安全指数的随机测量工具：来自土耳其的证据

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gazi university journal of science Pub Date : 2022-12-22 DOI: 10.35378/gujs.1110735

Hamit Erdal, Kemal Gürol Kurtay, Hakan Ayhan Dagistanli

{"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":null,"pages":null},"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}

引用次数: 0

A Hybrid Algorithm for Flow Shop Scheduling Problem with Unavailable Time Periods and Additional Resources 具有不可用时间段和额外资源的Flow Shop调度问题的混合算法

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gazi university journal of science Pub Date : 2022-12-21 DOI: 10.35378/gujs.1108155

F. Özçeli̇k, T. Saraç

引用次数: 0