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Development of a measurement system for noise and vibration of combine harvester

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International Journal of Agricultural and Biological Engineering 2020年第6期13卷 104-108页

作者： Deniz Yilmaz mehmet emin gökduman Department of Agricultural Machinery&Technology Engineering Faculty of AgricultureIsparta University of Applied SciencesIspartaTurkey

Combine harvesters are important in that grain and legumes directly affect the production *** the other hand,it forms an important branch of the agricultural machinery *** are many unknown constraints on machines when harvesting with a combine harvester,including the noise and vibration that occur in the combine harvester *** study aims to analyze noise and vibration in conventional combine harvesters using *** accelerometers were installed on each side of the concave and two microphones were used to register the noise of the threshing *** result showed that effects of machine speeds(3.5 km/h,4.5 km/h and 5.5 km/h)and rotor speeds(950 r/min,850 r/min and 950 r/min)were significantly important for the mean range values of the left and right accelerometer in the X,Y and Z *** machine’s speed and rotor speed were not significantly important for the mean range values of the left and right microphones.

关键词： measurement combine harvester sensors noise vibration

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联合收割机噪声与振动测试系统的研制

农业工程技术 2021年第6期41卷 90-90页

作者： Deniz Yilmaz mehmet emin g?kduman 土耳其伊斯帕塔应用科技大学农业学院农业机械与技术工程系

联合收割机的重要性在于粮食和豆类作物直接影响生产经济。另一方面,它也形成了农业机械领域的一个重要分支。联合收割机在运行时,存在许多未知的约束条件,包括脱粒机中产生的噪声和振动。该研究旨在利用传感器分析传统联合收割机的噪... 详细信息

联合收割机的重要性在于粮食和豆类作物直接影响生产经济。另一方面,它也形成了农业机械领域的一个重要分支。联合收割机在运行时,存在许多未知的约束条件,包括脱粒机中产生的噪声和振动。该研究旨在利用传感器分析传统联合收割机的噪音与振动。在凹面的两侧分别安装了两个加速度计,再用两个麦克风记录脱粒过程中的噪音。结果表明,机械转速(3.5 km/h、4.5 km/h和5.5 km/h)和转子转速(950 r/min、850 r/min和950 r/min)对左右加速度计在X、Y和Z方向上的平均量程值有显著影响。机器速度和转子速度对左右麦克风的平均范围值影响不大。

关键词：测量联合收割机传感器噪声振动

Effects of storage media,supplements and cryopreservation methods on quality of stem cells

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World Journal of Stem Cells 2021年第9期13卷 1197-1214页

作者： Ozgur Dogus Erol Burcu Pervin mehmet emin Seker Fatima Aerts-Kaya Department of Stem Cell Sciences Hacettepe University Graduate School of Health SciencesAnkara 06100Turkey Center for Stem Cell Research and Development Hacettepe UniversityAnkara 06100Turkey

Despite a vast amount of different methods, protocols and cryoprotective agents(CPA), stem cells are often frozen using standard protocols that have beenoptimized for use with cell lines, rather than with stem cells. Relatively fewcomparative studies have been performed to assess the effects of cryopreservationmethods on these stem cells. Dimethyl sulfoxide (DMSO) has been a key agent forthe development of cryobiology and has been used universally for ***, the use of DMSO has been associated with in vitro and in vivotoxicity and has been shown to affect many cellular processes due to changes inDNA methylation and dysregulation of gene expression. Despite studies showingthat DMSO may affect cell characteristics, DMSO remains the CPA of choice, bothin a research setting and in the clinics. However, numerous alternatives to DMSOhave been shown to hold promise for use as a CPA and include albumin,trehalose, sucrose, ethylene glycol, polyethylene glycol and many more. Here, wewill discuss the use, advantages and disadvantages of these CPAs for cryopreservationof different types of stem cells, including hematopoietic stem cells,mesenchymal stromal/stem cells and induced pluripotent stem cells.

关键词： Cryoprotective agents Dimethyl sulfoxide Hematopoietic stem cells Mesenchymal stromal/stem cells Induced pluripotent stem cells

Summary of the current guidelines for managing iatrogenic colorectal perforations and the evolving role of endoluminal vacuum therapy

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World Journal of Clinical Cases 2025年第6期13卷 1-8页

作者： Ahmed Tawheed Ibrahim Halil Bahcecioglu mehmet Yalniz Mubin Ozercan Ali Cagri Oral Mohamed El-Kassas Department of Endemic Medicine Faculty of MedicineHelwan UniversityCairo 11795Egypt Department of gastroenterology Firat UniversityElazig 23119Türkiye Liver Disease Research Center College of MedicineKing Saud UniversityRiyadh 7805Saudi Arabia

Colonoscopy represents a safe procedure that is widely used in medical practice either to diagnose or treat various gastrointestinal *** the last few years,the incidence rate of perforations in colonoscopic procedures has increased,especially in therapeutic *** recent advancements in endoscopic techniques and gastrointestinal tumoral resection procedures such as endoscopic mucosal resection,endoscopic full-thickness resection,and endoscopic submucosal dissection(ESD)could be a risk factor for this increased *** incidence rate of mortality of serious colonoscopic perforations is 7.1%.The management plan for these perforations starts with conservative treatment in mild cases,endoscopic closure,and surgical management in severe ***,endoluminal vacuum therapy was found to be effective in the management of colorectal perforations and this has been reported in multiple case *** editorial provides an overview of the current guidelines for the management of iatrogenic colorectal *** insights are from the perspectives of endoscopists and *** also present a management algorithm based on the guidelines of the European Society of gastrointestinal Endoscopy,the American gastroenterological Association,and the World Society of Emergency *** also discussed in brief the use of endoluminal vacuum therapy in colorectal perforations.

关键词： Colon Rectum Iatrogenic colonic perforation Colonoscopy guidelines Endovacuum Endolumical vacuum therapy Endoscopic management

Aerodynamics of non-slender delta and reverse delta wings:Wing thickness,anhedral angle and cropping ratio

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Chinese Journal of Aeronautics 2023年第4期36卷 79-91页

作者： göktug KOCAK mehmet Metin YAVUZ Turkish Aerospace Industries Inc.Aerodynamics Chief Engineer at TF-XProjectAnkara 06980Turkey Mechanical Engineering Department Middle East Technical UniversityAnkara 06800Turkey

The effects of thickness-to-chord(t=c)ratio,anhedral angle(d),and cropping ratio from trailing-edge(Cr%)on the aerodynamics of non-slender reverse delta wings in comparison to non-slender delta wings with sweep angle of 45°were characterized in a low-speed wind tunnel using force and pressure *** measurements were conducted for total of 8 different delta and reverse delta *** different t/c ratios of 5.9%and 1.1%,and two different anhedral angles ofd=15°and 30°for non-cropped and cropped at Cr=30%conditions were *** results indicate that the reverse delta wings generate higher lift-to-drag ratio and have better longitudinal static stability characteristics compared to the delta *** wing thickness has favorable effect on longitudinal static stability for the reverse delta wing whereas longitudinal static stability is not influenced by wing thickness for the delta *** reverse delta wings,the anhe-draled wing without cropping has adverse effect on aerodynamic performance and decreases the lift-to-drag *** in anhedraled wing causes significant improvement in lift-to-drag ratio,shift in aerodynamic and pressure centers towards the trailing-edge,and enhancement in longitudi-nal static stability.

关键词： Aerodynamic coefficients Anhedral Cropping Leading-edge vortex Longitudinal static stability Non-slender delta wing Non-slender reverse delta wing Stall Three-dimensional surface separation

DIRECTIONAL DERIVATIVE OF VECTOR FIELD AND REgULAR CURVES ON TIME SCALES

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Applied Mathematics and Mechanics(English Edition) 2006年第10期27卷 1349-1360页

作者： emin zyilmaz Department of Mathematics Ege University35100IzmirTurkey

The general idea in this paper is to study curves of the parametric equations where the parameter varies in a so-called time scale, which may be an arbitrary closed subset of the set of all real numbers. We introduce ... 详细信息

关键词： time scale nabla derivative regular curve tangent line vector field

Determining the edge effect of pine processionary moth (Thaumetopoea pityocampa) in its horizontal distribution in the stand

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Journal of Forestry Research 2019年第1期30卷 347-352页

作者： Salih Parlak kbal Meltem ?z?ankaya Mustafa Batur mehmet emin Akka? Zülfü Boza ?zgür Toprak Faculty of Forestry Bursa Technical University Aegean Forestry Research Inst?tute Forest Regional Management

Pine processionary moth is one of the most important forest pests in the Mediterranean Basin. There is need to explore its distribution behaviour to undertake effective control and determine the edge effect of its horizontal distribution in the stand. Five trial sites damaged by the insect were selected and traps installed in all trees in the sites. The number of nests and larvae was counted and diameter increment cores were taken. The distance to the edge of the stand revealed that there was no statistical difference in the number of nests and larvae up to 25 m while there was a statistically significant difference(0.5%)at [25 m. There was a 2-fold difference in the density of nests between 0 and 25 m and [25 meters, and a 3.8-fold difference in the number of larvae. The effect of pine processionary moth on tree diameter was not significant between trees at the edge of the stand and those in the stand.

关键词： Thaumetopoea pityocampa Pine processionary moth Edge effect

Strengthening the emergency health response to children wounded by explosive weapons in conflict

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World Journal of Pediatric Surgery 2022年第4期5卷 196-203页

作者： Hannah Wild Paul Reavley Emily Mayhew Emmanuel A Ameh mehmet emin Celikkaya Barclay Stewart Department of Surgery University of WashingtonSeattleWAUSA Bristol Royal Hospital for Children University Hospitals BristolBristolUK Department of Bioengineering Imperial College LondonLondonUK Division of Pediatric Surgery Department of SurgeryNational HospitalAbujaNigeria Department of Pediatric Surgery Mustafa Kemal UniversityHatayTurkey global Injury Control Section Harborview Injury Prevention and Research CenterSeattleWAUSA

The 2022 war in Ukraine has highlighted the unacceptable consequences wrought on civilians and health infrastructure by *** are among the most vulnerable of those affected and constitute an increasing percentage of non-combatants injured in conflicts globally.A disproportionate number of these injuries are caused by blast mechanisms from munitions including‘conventional’landmines and indiscriminate explosive weapons such as barrel bombs and improvised explosive *** 21st century conflict,children are no longer only accidental casualties of war,but are increasingly targeted by parties through acts such as bombing of school buses and playgrounds,conscription as child soldiers,and use as human *** the present viewpoint article,we review the state of pediatric blast injury studies,synthesizing current understandings of injury epidemiology and identifying gaps in research to advance the field towards a concrete agenda to improve care for this vulnerable population.

关键词： consequences injuries globally

Investigation of effects of Cocamide Diethanolamide chemical on physical and rheological properties of bituminous binder

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Frontiers of Structural and Civil Engineering 2022年第1期16卷 99-116页

作者： gizem KACAROgLU mehmet SALTAN Department of Civil Engineering Suleyman Demirel UniversityIsparta 32200Turkey

In this study,bituminous binder was modified with Cocamide Diethanolamide chemical,a non-ionic surfactant,and the physical and rheological properties of modified binders were *** addition,Cocamide Diethanolamide has been used for the first time to modify bituminous binder,and this situation makes the study *** binder was modified more than once with the chemical by changing modification parameters and using certain additive ratios(1%,3%,and 5%).The effects of different modification parameters and chemical additive on modified samples were investigated with conventional bitumen tests(softening point,penetration,ductility)and Superpave tests(rotational viscometer,rolling thin film oven test,pressure aging vessel,dynamic shear rheometer,bending beam rheometer).In addition,the structural characteristics of the reference binder and modified samples were examined by X-ray diffraction,Fourier Transform Infrared Spectroscopy,scanning electron microscopy,and energy dispersive X-ray *** examinations showed that Cocamide Diethanolamide softens bituminous binder and lowers processing *** addition,compared to reference binder,rutting resistances of modified bituminous binders decreased with the increase of additive ***,modification with Cocamide Diethanolamide increased the resistance to fatigue cracks and thermal cracks.

关键词： Cocamide Diethanolamide bitumen modification rheology Superpave tests