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Turkish Journal of Engineering and Environmental Sciences最新文献

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A statistical investigation to determine dominant frequency of layered soil profiles 确定分层土壤剖面优势频率的统计调查
Pub Date : 2021-03-01 DOI: 10.31127/TUJE.818539
A. Güllü, Serkan Hasanoğlu
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引用次数: 1
A BRIEF REVIEW ON ATTACK DESIGN AND DETECTION STRATEGIES FOR NETWORKED CYBER-PHYSICAL SYSTEMS 网络网络物理系统攻击设计与检测策略综述
Pub Date : 2021-01-01 DOI: 10.31127/tuje.640282
M. S. Ayas
Networked cyber-physical systems (NCPSs) can be found in various fields such as industrial process, robotics, smart buildings, energy, healthcare systems, transportation, and surveillance. Recently accomplished real-time attacks indicate security vulnerabilities that weaken the reliability of NCPSs. Research areas on the security of NCPSs can be categorized into two groups: from the perspective of information security, from the perspective of control theory. In this paper, first possible attack locations on the control scheme of a NCPS which can be divided into three different groups namely sensor side, actuator side, and state estimator side are discussed and then a brief survey containing some recent studies on security strategies for NCPSs from the perspective of control theory is presented. After that attack detection strategies for a NCPS are briefly introduced and a general architecture utilized for attack detection on a NCPS is presented. In addition, some of recent studies on attack detection strategies for NCPSs from the perspective of control theory are discussed.
网络网络物理系统(ncps)可以在工业过程、机器人、智能建筑、能源、医疗保健系统、运输和监控等各个领域找到。最近完成的实时攻击表明存在安全漏洞,这些漏洞会削弱ncps的可靠性。网络安全系统安全的研究领域可以分为两大类:从信息安全的角度出发,从控制理论的角度出发。本文首先讨论了NCPS控制方案可能受到攻击的位置,NCPS可分为传感器侧、执行器侧和状态估计器侧三种不同的类型,然后从控制理论的角度对NCPS安全策略的一些最新研究进行了简要综述。然后简要介绍了NCPS的攻击检测策略,并给出了用于NCPS攻击检测的通用体系结构。此外,本文还从控制理论的角度讨论了近年来ncps攻击检测策略的研究进展。
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引用次数: 1
THE EFFECTS OF INCLUDING SOCIAL FACTORS IN RIDE-MATCHING ALGORITHMS ON THE PERFORMANCE AND THE QUALITY OF MATCHES 包含社会因素的乘车匹配算法对匹配性能和质量的影响
Pub Date : 2021-01-01 DOI: 10.31127/tuje.657867
Omer Faruk Aydin, Ilgin Gökasar
Advancement in communication technologies has fostered alternative transport modes, such as ride-sharing. Ride-sharing aims to increase vehicle occupancy rates by matching riders with the drivers, who have empty seats on their vehicles and have similar routes and time schedules. Regarding to the success of a ride-sharing system, many researchers have been interested in efficient ride-matching algorithms. Ride-matching optimization problem is considered as NP-Hard Problem. In most of the ride-matching algorithms in the literature, to be able find matches at short notice some parameters were omitted. Hence, social characteristics and choices of participants, such as gender, age, employment status and willingness to socialize, were not included in many ride-matching algorithms. In this paper, the effects of including such factors in a ride-matching algorithm on the performance and the quality of the matches are investigated. Several ride-matching algorithms in the literature are simulated with randomly generated data. The simulation results show that when social factors are included the computation times and the quality of the matches increase significantly.
通信技术的进步催生了其他交通方式,比如拼车。拼车的目的是通过匹配乘客和司机来提高车辆入住率,他们的车上有空位,并且有相似的路线和时间表。关于拼车系统的成功,许多研究者对高效的拼车匹配算法感兴趣。车次匹配优化问题被认为是NP-Hard问题。在大多数文献中的乘车匹配算法中,为了能够在短时间内找到匹配,省略了一些参数。因此,参与者的社会特征和选择,如性别、年龄、就业状况和社交意愿,并没有被纳入许多乘车匹配算法中。本文研究了在乘车匹配算法中加入这些因素对匹配性能和匹配质量的影响。用随机生成的数据模拟了文献中的几种乘车匹配算法。仿真结果表明,考虑社会因素后,匹配的计算次数和匹配质量均有显著提高。
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引用次数: 1
THE INVESTIGATION OF HARDNESS PROPERTIES OF GFRP COMPOSITE PIPES UNDER SEAWATER CONDITIONS 海水条件下GFRP复合管材硬度性能的研究
Pub Date : 2020-12-21 DOI: 10.31127/TUJE.775536
Alper Gunoz, Yusuf Kepir, Memduh Kara
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引用次数: 3
FREEZE-THAW RESISTANCE OF BLAST FURNACE SLAG GEOPOLYMER MORTARS 高炉矿渣地聚合物砂浆的抗冻融性能
Pub Date : 2020-12-21 DOI: 10.31127/TUJE.810937
Ş. Bingöl, C. Bilim, C. Atiş, U. Durak
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引用次数: 0
Application of artificial intelligence methods for bovine gender prediction 人工智能方法在牛性别预测中的应用
Pub Date : 2020-12-07 DOI: 10.31127/TUJE.807019
Ali Öztürk, N. Allahverdi, Fatih Saday
This study investigates determining the gender of calves using some artificial intelligence (AI) techniques. Gender identification is important in animal breeding, focusing on the desired outcome and planning. The data used to determine the gender of calves were the speed, magnitude, and density of the bull's semen. The analysis of the related studies showed that there was not a study on gender prediction of bovine with the application of AI methods. In this study, fuzzy logic (FL), artificial neural networks (ANN), support vector machines (SVM), and random forests (RF) were used. The efficiency of these approaches was verified by statistical analysis parameters such as accuracy, specificity, sensitivity (recall), precision, and F-score. The FL, ANN, SVM, and RF models had 84%, 96%, 97%, 99% accuracy, 93.75%, 96.88%, 100%, 100% sensitivity, 66.66%, 94.44%, 92.31%, 97.30% specificity, 83.33%, 96.88%, 95.31%, 98.44% precision results, respectively. Application of these AI techniques for prediction bovine gender proves that these methods may be used by semen breeders as supporting information tools. In particular, it was observed that the RF method yielded the highest accuracy results.
本研究探讨了使用一些人工智能(AI)技术来确定小牛的性别。性别鉴定在动物育种中很重要,重点是期望的结果和计划。用来确定小牛性别的数据是公牛精液的速度、数量和密度。对相关研究的分析表明,目前还没有应用人工智能方法进行牛性别预测的研究。本研究采用模糊逻辑(FL)、人工神经网络(ANN)、支持向量机(SVM)和随机森林(RF)等方法。这些方法的有效性通过准确性、特异性、灵敏度(召回率)、精密度和f分数等统计分析参数得到验证。FL、ANN、SVM和RF模型的准确率分别为84%、96%、97%、99%,灵敏度为93.75%、96.88%、100%、100%,特异性为66.66%、94.44%、92.31%、97.30%,准确率为83.33%、96.88%、95.31%、98.44%。这些人工智能技术在预测牛性别方面的应用证明,这些方法可能被精液育种者用作辅助信息工具。特别是,观察到射频方法产生的结果精度最高。
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引用次数: 2
LOW VELOCITY IMPACT BEHAVIORS OF BASALT/EPOXY REINFORCED COMPOSITE LAMINATES WITH DIFFERENT FIBER ORIENTATIONS 不同纤维取向玄武岩/环氧树脂增强复合材料层合板的低速冲击性能
Pub Date : 2020-10-01 DOI: 10.31127/tuje.644025
Ö. Özbek, Ö. Bozkurt, A. Erkliğ
The current study aims to explore the effects of fiber orientation angle on the low velocity impact behaviors of the basalt fiber reinforced composite laminates. Samples with four different orientation angles (0o/90o, 15o/-75o, 30o/-60o and 45o/- 45o) fabricated by vacuum assisted resin transfer molding have being tested on the Charpy impact test machine. Furthermore, failure modes of notched/unnotched samples subjected to impact loadings in the flatwise and edgewise directions have been examined to detailly understand fracture behavior. The results showed that the fiber orientation angle has substantial effects on the energy absorption capability and impact toughness of the samples. The increment in fiber orientation angle was led to increases in impact energy and toughness, and the reduction in impact damage. The best values as 3.07 J and 34.82 kJ/m 2 for impact energy and impact toughness, respectively, are obtained from the notched samples in edgewise impact loading that having (45o/-45o) fiber orientation angle. Almost all of the samples exhibited failure modes as matrix fragmentation, delamination, fiber cracking and fiber pull-out, respectively. The most destructive results were observed as laminate fracture on the samples having (0o/90o) fiber orientation angle.
本研究旨在探讨纤维取向角对玄武岩纤维增强复合材料层合板低速冲击性能的影响。采用真空辅助树脂传递模塑工艺制备了4种不同取向角(0 /90度、150 /-75度、300 /-60度和45 /- 45度)的样品,并在Charpy冲击试验机上进行了试验。此外,缺口/未缺口样品在平面和边缘方向的冲击载荷下的破坏模式已经被检查,以详细了解断裂行为。结果表明,纤维取向角对试样的吸能性能和冲击韧性有较大影响。随着纤维取向角的增大,冲击能和韧性增加,冲击损伤减小。当纤维取向角为(45°/-45°)时,缺口试样的冲击能和冲击韧性最佳值分别为3.07 J和34.82 kJ/ m2。几乎所有试样的破坏模式分别为基体破碎、分层、纤维断裂和纤维拔出。纤维取向角为(0 /90)的试样以层状断裂最具破坏性。
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引用次数: 7
BUCKLING ANALYSIS OF LAMINATED COMPOSITE PLATES UNDER THE EFFECT OF UNIAXIAL AND BIAXIAL LOADS 单轴和双轴载荷作用下层合复合材料板屈曲分析
Pub Date : 2020-10-01 DOI: 10.31127/tuje.665156
A. Dogan
This paper investigates the buckling analysis of simply supported symmetrically thin and thick composite plates. Using the Hamilton’s principle, the governing equation for thin and thick composite plates is derived. The equation of motion for thin and thick laminated rectangular plates subjected to in-plane loads is obtained with the help of Hamilton’s principle. The loading conditions of rectangular plate are uniaxial and biaxial compression. Considering the Navier solution technique, closed form solutions are attained and buckling loads are found by solving the eigenvalue problems. In this study, the effect of edge ratios and anisotropy on the buckling analysis of rectangular plate was investigated. The computer programs have been written separately with the help of Mathematica (MATHEMATICA 2017) program for the solution of the buckling analysis of laminated composite plates. Results of the numerical studies for the buckling of laminated composite plates (LCP) are demonstrated and benchmarked with former studies in the literature and ANSYS finite element methods.
本文研究了对称薄、厚简支复合材料板的屈曲分析。利用哈密顿原理,推导了薄板和厚板的控制方程。利用哈密顿原理,得到了矩形薄板和矩形厚板在面内载荷作用下的运动方程。矩形板的加载条件为单轴压缩和双轴压缩。采用Navier解法,通过求解特征值问题得到闭合解和屈曲载荷。本文研究了边比和各向异性对矩形板屈曲分析的影响。计算机程序在Mathematica (Mathematica 2017)软件的帮助下单独编写,用于层合复合材料板屈曲分析的求解。本文对层合复合材料板屈曲的数值研究结果进行了验证,并与已有的文献研究和ANSYS有限元方法进行了对比。
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引用次数: 1
BULGUR INDUSTRY WASTEWATER TREATMENT BY MICROBIAL FUEL CELL – EXPLORATORY STUDY 微生物燃料电池处理炼钢工业废水的探索性研究
Pub Date : 2020-10-01 DOI: 10.31127/tuje.646603
M. Saleh, M. Yalvaç, Luey Halef, Muhammed Şahin Hekim, H. Arslan
The bulgur industry has importance in the food sector in Turkey. The wastewater generated from this industry can be considered biowaste. The microbial fuel cells (MFC) are a relatively new technique aiming to treat the wastewater and producing direct energy. This study aims to explore the degradation efficiency of the organic matters expressed as chemical oxygen demand (COD) founded in bulgur industry wastewater by microbial fuel cell techniques. Furthermore, it aims to study the potential formation of electricity from this type of wastewater. In this study, the MFC – double chamber system was performed. 1.5 L bulgur industry wastewater containing 3% of biomass was used. The COD and the voltage were measured. The COD generated from the bulgur industry wastewater was 28800 mg/L. After using the MFC system, the COD was decreased to reach 2560 mg/L with a removal efficiency of 91%. 1st order kinetic model had the best fit for COD removal with a correlation coefficient (R2) of 0.95. The maximum and average voltages were 0.448 Volt and 0.180 Volt, respectively. The average voltage for every 1 m2 was 45 volt. As a result of the exploratory study, the MFC can be used to treat the bulgur industry wastewater and generating energy. But it should be combined with other treatment methods to meet the standards.
干肉饼业在土耳其的食品行业中占有重要地位。该工业产生的废水可以被认为是生物废物。微生物燃料电池(MFC)是一项相对较新的技术,旨在处理废水并产生直接能源。本研究旨在探讨微生物燃料电池技术对炼钢工业废水中以化学需氧量(COD)表示的有机物的降解效率。此外,它旨在研究从这类废水中形成电力的可能性。本研究采用MFC -双腔系统。利用1.5 L含3%生物质的焦化工业废水。测量了COD和电压。炼钢工业废水的COD为28800 mg/L。采用MFC系统后,COD降至2560 mg/L,去除率达91%。一级动力学模型最适合COD去除,相关系数(R2)为0.95。最大电压为0.448伏,平均电压为0.180伏。每1平方米的平均电压为45伏。通过探索性研究,MFC可用于炼钢工业废水的处理和发电。但要与其他治疗方法相结合才能达到标准。
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引用次数: 0
EFFECTIVE ADSORPTION OF TETRACYCLINE WITH Co3O4/Fe3O4 BIMETALLIC NANOPARTICLES Co3O4/Fe3O4双金属纳米颗粒对四环素的有效吸附
Pub Date : 2020-10-01 DOI: 10.31127/tuje.648882
M. Ergüt, M. Musa, Hozaifa Hasan, Hülya Malkoç, Deniz Uzunoğlu, A. Özer
In the present study cobalt oxide/iron oxide bimetallic nanoparticles (Co 3 O 4 /Fe 3 O 4 NPs) were synthesized by chemical coprecipitation method. The synthesized Co 3 O 4 /Fe 3 O 4 NPs were characterized by SEM and XRD analysis. The synthesized nanoparticles were used as an adsorbent for the removal of a kind of antibiotic as Tetracycline (TC) from aqueous solutions. According to characterization results, small plate-like structures and agglomerated irregular spherical nanosized particles (101.85 ± 15.04 nm) were formed. The XRD data confirmed the structure of synthesized adsorbent was Co 3 O 4 /Fe 3 O 4 . The optimum tetracycline adsorption conditions were determined as the initial pH of solution 9.0, temperature 55°C, and adsorbent concentration 3.0 g/L. A linear increase was observed in equilibrium uptakes of TC with the increasing the initial antibiotic concentrations. The experimental equilibrium data was modelled with Langmuir and Freundlich isotherm models. The experimental equilibrium data was the best agreement to the Langmuir isotherm model. The maximum monolayer coverage capacity of Co 3 O 4 /Fe 3 O 4 NPs for TC adsorption was found to be 149.26 mg/g at 55°C optimum temperature. The experimental kinetic adsorption data were defined as the best agreement with the pseudo-second-order kinetic model. Weber Morris mass transfer modelling results showed that both the film (boundary layer) and intra-particle diffusion were effective in the adsorption process. The thermodynamic studies suggested that the adsorption process was endothermic, spontaneous and the positive ΔS value indicated increased disorder at the solid-solution interface during the adsorption. Moreover, the synthesized adsorbent showed high adsorption efficiencies at the end of seven sequence usages.
本文采用化学共沉淀法合成了氧化钴/氧化铁双金属纳米粒子(co3o4 / fe3o4 NPs)。用SEM和XRD对合成的co3o4 / fe3o4纳米粒子进行了表征。将合成的纳米颗粒作为吸附剂用于去除水中的四环素等抗生素。表征结果显示,形成了小片状结构和不规则球形纳米颗粒(101.85±15.04 nm)。XRD数据证实合成的吸附剂结构为co3o4 / fe3o4。最佳吸附条件为溶液初始pH 9.0,温度55℃,吸附剂浓度3.0 g/L。随着初始抗生素浓度的增加,平衡吸收TC呈线性增加。实验平衡数据采用Langmuir和Freundlich等温线模型。实验平衡数据与Langmuir等温线模型最吻合。在55℃的最佳温度下,co3o4 / fe3o4 NPs对TC吸附的最大单层覆盖容量为149.26 mg/g。实验动力学吸附数据与拟二级动力学模型最吻合。Weber Morris传质模拟结果表明,膜(边界层)和颗粒内扩散在吸附过程中都是有效的。热力学研究表明,吸附过程是吸热自发的,ΔS值为正表明吸附过程中固液界面的无序性增加。此外,合成的吸附剂在7次顺序使用结束时表现出较高的吸附效率。
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引用次数: 0
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Turkish Journal of Engineering and Environmental Sciences
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