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Robust Backstepping Control of a Quadrotor Unmanned Aerial Vehicle under Colored Noises

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Computers, Materials & Continua 2025年第1期82卷 777-798页

作者： mehmet Karahan Electrical and Electronic Engineering Department Atilim UniversityAnkara06830Turkey

Advances in software and hardware technologies have facilitated the production of quadrotor unmanned aerial vehicles(UAVs).Nowadays,people actively use quadrotor UAVs in essential missions such as search and rescue,counter-terrorism,firefighting,surveillance,and cargo *** performing these tasks,quadrotors must operate in noisy ***,a robust controller design that can control the altitude and attitude of the quadrotor in noisy environments is of great *** researchers have focused only on white Gaussian noise in their studies,whereas researchers need to consider the effects of all colored noises during the operation of the *** study aims to design a robust controller that is resistant to all colored ***,a nonlinear quadrotormodel was created with ***,a backstepping controller resistant to colored noises was *** backstepping controller was tested under Gaussian white,pink,brown,blue,and purple *** and Lyapunov-based controller designswere also carried out,and their time responses(rise time,overshoot,settling time)were compared with those of the backstepping *** the simulations,time was in seconds,altitude was in meters,and roll,pitch,and yaw references were in *** and settling time values were in seconds,and overshoot value was in *** the obtained values are examined,simulations prove that the proposed backstepping controller has the least overshoot and the shortest settling time under all noise types.

关键词： Backstepping control colored noises Gaussian noise Lyapunov stability quadrotor robustness PID control

Exploring the dynamics of creative tourism:A tourist-centric perspective to achieve economic sustainable development

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Journal of Mountain Science 2025年第1期22卷 278-295页

作者： ZOU Fuxia Atefeh AHMADI DEHRASHID mehmet AKIF CIFCI Emrah ARSLAN Nina KHALIGHI College of Tourism and Aviation Management Hunan Women's UniversityChangsha 410004China Faculty of Natural Resources Department of ClimatologyUniversity of KurdistanSanandaj ***Iran Member of Department of Zrebar Lake Economic-social Research Kurdistan Studies InstituteUniversity of KurdistanSanandaj ***Iran Department of Computer Engineering Bandirma Onyedi Eylul UniversityBalikesir 10200Türkiye Engineering and Informatics Department Klaipėdos ValstybinėKolegija/Higher Education InstitutionKlaipeda 92294Lithuania Engineering and Informatics Department KTO KaratayKonya 42020Türkiye Department of Urban Planning and Design Faculty of Art and ArchitectureUniversity of KurdistanSanandaj ***Iran

Creative tourism is a dynamic and innovative approach to tourism,which points out the importance of people's active participation and their immersion in such *** a vernacular context,it should attract people(local and tourists)attention to accomplish its main *** its rich cultural and natural assets,Kurdistan province faces several challenges that impact its tourism *** achieve that,the study uses quantitative approach to thoroughly analyze and evaluate the components of creative tourism in this *** research focuses on tourists who visited the province's ten towns during the spring and summer of *** collection utilized a Likert-scale questionnaire ranging from"very good"to"very poor".The study employed a semistructured questionnaire developed through qualitative interviews alongside a researcher-made questionnaire validated by experts from the University of *** qualitative questionnaire achieved a high-reliability score of 93%using Cronbach's alpha ***-depth interviews and literary research were conducted to identify creative tourism components and indicators,informing the development of a quantitative *** analysis was performed using SPSS 20 and AMOS software to scrutinize the survey findings,providing insights into enhancing creative tourism strategies in Kurdistan *** results reveal the varying significance of these dimensions,with the cultural dimension identified as the most crucial(factor loading:0.95),followed by the social(0.92),economic(0.88),and managerial/political dimensions(0.83).The study highlights the importance of cultural planning,community engagement,and infrastructural support in fostering creative ***,it explores the impact of creative industries,such as music and arts rooted in Kurdish culture,on tourism *** diversification and spatialphysical considerations are critical factors in enhancing Kurdistan's appeal as a creative

关键词： Creative tourism Tourism development Local and regional development Structural equation Iran

ECHOS OF THE STEINER-LEHMUS EQUAL BISECTORSSTHEOREM

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Acta Mathematica Scientia 2025年第1期45卷 257-263页

作者： Christoph BÖRGERS Eric L.GRINBERG mehmet ORHON Junhao SHEN Department of Mathematics Tufts UniversityMedfordMA02155USA Department of Mathematics University of Massachusetts BostonBostonMA02125USA Department of Mathematics&Statistics University of New HampshireDurhamNH03824USA

The Steiner-Lehmus equal bisectors theorem originated in the mid 19th *** its age,it would have been accessible to Euclid and his *** theorem remains evergreen,with new proofs continuing to appear *** theorem has fostered discussion about the nature of proof itself,direct and *** we continue the momentum by providing a trigonometric proof,relatively short,based on an analytic estimate that leverages algebraic trigonometric *** proofs of the theorem exist in the *** of these contain key ideas that already appeared in ***’1850 proofs,not always with *** the aim of increasing awareness of and making more accessible Lehmus’proofs,we provide an annotated *** conclude with remarks on different proofs and relations among them.

关键词： Steiner-Lehmus theorem equal bisectors

selective recovery of rare earth elements by smelting of magnets

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Journal of Rare Earths 2025年第1期43卷 209-217,I0008页

作者： Venkata Lakshmi Borra Prasanta Jana PPSahoo Prakash Venkatesan mehmet Ali Recai Onal Chenna Rao Borra Department of Metallurgical and Materials Engineering Indian Institute of Technology KharagpurWest Bengal721302India R&D Tata Steel Ltd.Jamshedpur831001India Department of Materials Engineering Synthesis and Recycling(4MAT)Universite Libre de BruxellesCP165/631050BrusselsBelgium GenoMines 630 Rue Noetzlin91190ParisFrance

Rare earth elements(REEs)play a crucial role in many technologies from daily appliances in cell phones to more advanced wind turbines and electric *** magnets account for a quarter of total global REEs production and have high recycling *** this study,smelting process was used to selectively oxidize REEs in the permanent magnets by adding Fe_(2)O_(3).This separates REEs into a slag phase from an iron-rich metallic phase.B_(2)O_(3) was also added to the system as a flux to lower the slag melting *** minimizes REEs loss to the metallic phase and allows a more efficient phase *** effect of flux and oxidizing agent addition was investigated on both regular and cerium-rich NdFeB(NdCeFeB)*** 1350℃and for 1 h,the slag phase was successfully separated from the metallic phase with the addition of 0.8 stoichiometric amount of Fe_(2)O_(3) and 40 wt%of B_(2)O_(3).Scanning electron microscopy-energy dispersive X-ray spectroscopy(SEM-EDX)analysis reveals that REEs in the magnet do not migrate to the metal phase while the REE-rich slag phase contains almost no *** the selective removal of iron into the metallic phase,REEs are recovered from the slag phase through an acid leaching process allowing>99%of REEs *** in the magnet can also be recovered as useful boric acid by evaporation and crystallisation *** proposed process in this study is reagent and energy-efficient with almost complete valorisation of both NdCeFeB and NdFeB magnets.

关键词： Recycling Rare earth elements NdFeBmagnets Smelting Leaching

Potential effects of adenosine triphosphate and melatonin on oxidative and inflammatory optic nerve damage in rats caused by 5-fluorouracil

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International Journal of Ophthalmology(English edition) 2025年第2期18卷 222-228页

作者： Ahmet mehmet Somuncu Busra Parlak Somuncu Ahmet Duhan Ozbay Ibrahim Cicek Bahadir Suleyman Renad Mammadov Seval Bulut Tugba Bal Tastan Taha Abdulkadir Coban Halis Suleyman Aliyev Aydin Trabzon Kanuni Education and Research Hospital Health Sciences UniversityTrabzon 61250Turkiey Provincial Health Directorate Ministry of Health of the Republic of TurkeyTrabzon 61040Turkiey Department of Ophthalmology Erzurum City HospitalHealth Sciences UniversityErzurum 25240Turkiey Department of Ophthalmology Faculty of MedicineErzincan Binali Yildirim UniversityErzincan 24100Turkiey Department of Pharmacology Faculty of MedicineErzincan Binali Yildirim UniversityErzincan 24100Turkiey Department of Histology and Embryology Faculty of MedicineErzincan Binali Yildirim UniversityErzincan 24100Turkiey Department of Biochemistry Faculty of MedicineErzincan Binali Yildirim UniversityErzincan 24100Turkey Department of Pharmacology Azerbaijan Medical UniversityBakuAZ1022Azerbaijan

AIM:To investigate the effects of adenosine triphosphate(ATP)and melatonin,which have antioxidant and antiinflammatory activities,on potential 5-fluorouracil(5-FU)-induced optic nerve damage in ***:Twenty-four rats were categorized into four groups of six rats:healthy(HG),5-FU(FUG),ATP+5-FU(AFU),and melatonin+5-FU(MFU).ATP(4 mg/kg)and melatonin(10 mg/kg)were administered intraperitoneally and orally,*** hour after ATP and melatonin administration,rats in the AFU,MFU,and FUG were intraperitoneally injected with 5-FU(100 mg/kg).ATP and melatonin were administered once daily for 10d.5-FU was administered at a single dose on days 1,3,and 5 of the *** 10d,the rats were euthanized and optic nerve tissues were *** nerve tissues were biochemically and histopathologically ***:ATP and melatonin treatments inhibited the increase in malondialdehyde(MDA)and interleukin-6(IL-6)levels,which were elevated in the *** treatments also prevented the decrease in total glutathione(tGSH)levels and the superoxide dismutase(SOD)and catalase(CAT)activities(P<0.001).This inhibition was higher in the ATP group than in the melatonin group(P<0.001).ATP prevented histopathological damage better than melatonin(P<0.05).CONCLUSION:ATP and melatonin have the potential to be used in alleviating 5-FU-induced optic nerve *** addition,ATP treatment shows better protective effects than melatonin.

关键词： adenosine triphosphate melatonin 5-fluorouracil optic nerve damage antioxidant antiinflammatory

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

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度假区惨剧

财新周刊 2025年第4期 12-13页

作者： mehmet Emin Gurbuz(图) 无不详视觉中国

当地时间2025年1月21日,土耳其博卢,滑雪胜地卡塔尔卡亚(Kartalkaya)一酒店发生火灾后,消防队正在救援。火灾发生于21日3时27分。据土耳其司法部声明称,火灾中所有遇难者的身份均已确认火灾造成的死亡人数为78人。土耳其内政部长阿里·... 详细信息

当地时间2025年1月21日,土耳其博卢,滑雪胜地卡塔尔卡亚(Kartalkaya)一酒店发生火灾后,消防队正在救援。火灾发生于21日3时27分。据土耳其司法部声明称,火灾中所有遇难者的身份均已确认火灾造成的死亡人数为78人。土耳其内政部长阿里·耶尔利卡亚21日晚通报,由于正值该地旅游旺季,火灾发生时这座12层高的酒店共约有238名客人。目前,火灾原因还在进一步调查中,酒店业主等11人已被逮捕并接受调查。土耳其总统埃尔多安21日宣布22日为全国哀悼日,以悼念此次火灾中的遇难者。

关键词：博卢埃尔多安旅游旺季火灾原因死亡人数全国哀悼日度假区土耳其

Seventy-five years of masting and rodent population peaks in Norway: Why do wood mice not follow the rules?

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Integrative Zoology 2016年第5期11卷 388-402页

作者： Vidar selÅS Department of Ecology and Natural Resource Management Norwegian University of Life SciencesÅsNorway

Wood mouse(Apodemus sylvaticus)populations are expected to show a peak in autumn in the year after a mast year of sessile oak(Quercus petraea),because stored acorns increase winter *** Aust-Agder,South Norway,only 16 of 34 mast years from 1939-2014 were followed by a year with a peak in the wood mouse *** many of the remaining instances,there rather was a minor peak 2 or 3 years after the *** multiple logistic regression models,the probability of a wood mouse population peak after a mast year of sessile oak was positively related to a snow-corrected temperature index of the previous winter and negatively to a small rodent population index of the previous *** present study thus supports the hypothesis that longer periods with snow-free ground and subzero temperatures negatively affect wood mouse winter ***cause it may be difficult for wood mice to survive on a diet consisting of acorns alone,the negative relationship with the rodent population index of the previous year is most likely caused by an over-exploitation of necessary alternative food resources,such as other plant seeds and *** acorns not utilized during one winter are assumed to benefit wood mice in a succeeding winter,giving a delayed population peak relative to the mast year.

关键词： acorns masting seed production winter temperature wood mouse

Characterization of Turkish Astragalus honeys according to their phenolic profiles and biological activities with a chemometric approach

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Food Bioscience 2023年第3期53卷 604-614页

作者： selçuk Küçükaydın Gülsen Tel-Çayan Fatih Çayan Meltem Tas-Küçükaydın Büsra Eroglu mehmet Emin Duru mehmet Öztürk Department of Medical Services and Techniques Köycegiz Vocational School of Health ServicesMugla SıtkıKoçman University48800KöycegizMuglaTurkey Department of Chemistry and Chemical Processing Technologies Mugla Vocational SchoolMugla SıtkıKoçman University48000MuglaTurkey Department of Chemistry Faculty of ScienceMugla SıtkıKoçman University48000MuglaTurkey

The genus of Astragalus provides a significant source of pollen and nectar for *** this study,37 Astragalus honey samples in 8 different regions from Turkey were investigated for the phenolic compositions and antioxidant,antimicrobial,anti-quorum sensing,anti-inflammatory and enzyme inhibitory(urease,tyrosinase,butyrylcholinesterase(BChE),and acetylcholinesterase(AChE))activities with chemometric *** phenolic compounds and organic acids were detected using HPLC-DAD and levulinic,gallic,p-hydroxy benzoic,vanilic and p-coumaric acids were found to be common compounds in all studied Astragalus honey *** ET coded Astragalus honey sample from Erzurum showed the best antioxidant activity in DPPH^(•)(IC_(50):12.54±0.25 mg/mL),ABTS^(•+)(IC_(50):4.20±0.12 mg/mL)andβ-carotene linoleic acid(IC_(50):3.85±0.11 mg/mL)*** honey samples studied displayed moderate antimicrobial activity against Candida species,gram-negative and gram-positive bacteria while they showed high quorum sensing inhibition *** NB coded Astragalus honey sample from Ni˘gde exhibited the highest anti-inflammatory activity against COX-1(76.11±0.80%)and COX-2(55.98±0.93%)*** studied Astragalus honey samples showed mild enzyme inhibitory activities against AChE,BChE,urease and *** chemometric characterization based on the botanical origin of Astragalus honey samples was determined using principal component analysis(PCA)and hierarchical cluster analysis(HCA).

关键词： Astragalus honey Phenolic composition Antioxidant activity Antimicrobial activity Enzyme inhibitory activity Chemometric approaches