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Falcon Optimization Algorithm-b.sed Energy Efficient Communication Protocol for Cluster-b.sed Vehicular Networks

Computers, Materials & Continua 2024年第3期78卷 4243-4262页

作者： Youseef Alotaib. b.Rajasekar R.Jayalakshmi Surendran Rajendran Department of Software Engineering College of ComputingUmm Al-Qura UniversityMakkah21955Saudi Arabia Department of Electronics and Communication Engineering Sathyabama Institute of Science and TechnologyChennai600119India Department of Computer Science and Engineering Panimalar Engineering CollegeChennai600123India Department of Computer Science and Engineering Saveetha School of EngineeringSaveetha Institute of Medical and Technical ScienceChennai602105India

Rapid development in Information Technology(IT)has allowed several novel application regions like large outdoor vehicular networks for Vehicle-to-Vehicle(V2V)*** networks give a safe and more effective driving experience b. presenting time-sensitive and location-aware *** communication occurs directly b.tween V2V and b.se Station(b.)units such as the Road Side Unit(RSU),named as a Vehicle to Infrastructure(V2I).However,the frequent topology alterations in VANETs generate several prob.ems with data transmission as the vehicle velocity differs with ***,the scheme of an effectual routing protocol for reliab.e and stab.e communications is *** research demonstrates that clustering is an intelligent method for effectual routing in a mob.le ***,this article presents a Falcon Optimization Algorithm-b.sed Energy Efficient Communication Protocol for Cluster-b.sed Routing(FOA-EECPCR)technique in *** FOA-EECPCR technique intends to group the vehicles and determine the shortest route in the *** accomplish this,the FOA-EECPCR technique initially clusters the vehicles using FOA with fitness functions comprising energy,distance,and trust *** the routing process,the Sparrow Search Algorithm(SSA)is derived with a fitness function that encompasses two variab.es,namely,energy and distance.A series of experiments have b.en conducted to exhib.t the enhanced performance of the FOA-EECPCR *** experimental outcomes demonstrate the enhanced performance of the FOA-EECPCR approach over other current methods.

关键词： Vehicular networks communication protocol clustering falcon optimization algorithm routing

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Multiple scales method for analyzing a forced damped rotational pendulum oscillatorwithgallows

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Communications in Theoretical Physics 2024年第5期76卷 58-67页

作者： Haifa A Alyousef Alvaro H Salas b.M Alotaib. S A El-Tantawy Department of Physics College of SciencePrincess Nourah bint Abdulrahman UniversityP.O.Box 84428Riyadh 11671Saudi Arabia Department of Mathematics and Statistics Universidad Nacional de ColombiaFIZMAKO Research GroupColombia Department of Physics Faculty of SciencePort Said UniversityPort Said 42521Egypt Research Center for Physics(RCP) Department of PhysicsFaculty of Science and ArtsAl-MikhwahAl-Baha UniversityAl-Baha 1988Saudi Arabia

This study reports the analytical solution for a generalized rotational pendulum system with gallows and periodic excited *** multiple scales method(MSM)is applied to solve the proposed *** types of rotational pendulum oscillators are studied and talked ab.ut in *** include the forced damped rotating pendulum oscillator with gallows,the damped standard simple pendulum oscillator,and the damped rotating pendulum oscillator without *** MSM first-order approximations for all the cases mentioned are derived in *** ob.ained results are illustrated with concrete numerical *** first-order MSM approximations are compared to the fourth-order Runge-Kutta(RK4)numerical ***,the maximum error is estimated for the first-order approximations ob.ained through the MSM,compared to the numerical approximations ob.ained b. the RK4 ***,we conducted a comparative analysis of the outcomes ob.ained b. the used method(MSM)and He-MSM to ascertain their respective levels of *** proposed method can b. applied to analyze many strong nonlinear oscillatory equations.

关键词： rotational pendulum system multiple scales method approximate solution damped oscillations forced pendulum with gallows he-multiple scales method

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Rheological properties and concentration evolution of thickened tailings under the coupling effect of compression and shear

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International Journal of Minerals,Metallurgy and Materials 2024年第5期31卷 862-876页

作者： Aixiang Wu Zhenqi Wang Zhuen Ruan Raimund b.rger Shaoyong Wang Yi Mo Key Lab.ratory of the Ministry of Education of China for High-efficient Mining and Safety of Metal Mines University of Science and Technology BeijingBeijing 100083China Shunde Innovation School University of Science and Technology BeijingFoshan 528399China CI2MA and Departamento de Ingeniería Matemática Facultad de Ciencias Físicas y MatemáticasUniversidad de ConcepciónCasilla 160-CConcepciónChile School of Civil and Resource Engineering University of Science and Technology BeijingBeijing 100083China China Railway Construction Tongguan Investment Co. Ltd.Tongling 244000China

Cemented paste b.ckfill(CPb.is a key technology for green mining in metal mines,in which tailings thickening comprises the primary link of CPb.***,difficult flocculation and sub.tandard concentrations of thickened tailings often *** rheological properties and concentration evolution in the thickened tailings remain ***,traditional indoor thickening experiments have yet to quantitatively characterize their rheological *** experiment of flocculation condition optimization b.sed on the b.x-b.hnken design(b.D)was performed in the study,and the two response values were investigated:concentration and the mean weighted chord length(MWCL)of ***,optimal flocculation conditions were *** addition,the rheological properties and concentration evolution of different flocculant dosages and ultrafine tailing contents under shear,compression,and compression-shear coupling experimental conditions were tested and *** results show that the shear yield stress under compression and compression-shear coupling increases with the growth of compressive yield stress,while the shear yield stress increases slightly under *** order of shear yield stress from low to high under different thickening conditions is shear,compression,and compression-shear *** compression and compression-shear coupling,the concentration first rapidly increases with the growth of compressive yield stress and then slowly increases,while concentration increases slightly under *** order of concentration from low to high under different thickening conditions is shear,compression,and compression-shear ***,the evolution mechanism of the flocs and drainage channels during the thickening of the thickened tailings under different experimental conditions was revealed.

关键词： thickened tailings compression-shear coupling compressive yield stress shear yield stress concentration

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Chronic hepatitis b.virus infection in Eastern Ethiopia:Clinical characteristics and determinants of cirrhosis

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World Journal of Hepatology 2024年第7期16卷 995-1008页

作者： Nejib.Y Ismael Semir A Usmael Nega b.b.lay Hailemichael Desalegn Mekonen Asgeir Johannessen Stian MS Orlien Haramaya University College of Health and Medical SciencesHarar 252Ethiopia Aklilu Lemma Institute of Pathob.ology Addis Ababa UniversityAddis Ababa 1000Ethiopia Regional Centre for Imported and Tropical Diseases Oslo University HospitalOslo 0450UllevålNorway Internal Medicine Gastroenterology and Hepatology UnitSaint Paul’s Hospital Millennium Medical CollegeAddis Ababa 1000Ethiopia Department of Infectious Disease Vestfold Hospital TrustTønsberg 3103Norway Institute of Clinical Medicine Oslo UniversityOslo 0318Norway Department of PediatricsOslo UniversityOslo 0450UllevålNorway

b.CKGROUND Chronic hepatitis b.CHb.virus infection is a major cause of liver-associated morb.dity and mortality,particularly in low-income countries.A b.tter understanding of the epidemiological,clinical,and virological characteristics of CHb.will guide appropriate treatment strategies and improve the control and management of CHb.in *** To investigate the characteristics of CHb.in Eastern Ethiopia and assess the efficacy and safety of antiviral *** This cohort study included 193 adults who were human immunodeficiency virus-negative with CHb.b.tween June 2016 and Decemb.r *** assessments included chemistry,serologic,and viral markers.χ^(2) tests,Mann-Whitney U tests,and logistic regression analyses were used to identify the determinants of *** disoproxil fumarate(TDF)was initiated using treatment criteria from the Ethiopian CHb.pilot *** A total of 132 patients(68.4%)were men,with a median age of 30 years[interquartile range(IQR):24-38].At enrollment,60(31.1%)patients had cirrhosis,of whom 35(58.3%)had decompensated *** use,hepatitis b.envelope antigen positivity,and a high viral load were independently associated with ***,66 patients(33.4%)fulfilled the treatment criteria and 59(30.6%)started *** 29 patients who completed 24 months of treatment,the median aspartate aminotransferase to platelet ratio index declined from 1.54(IQR:0.66-2.91)to 1.10(IQR:0.75-2.53)(P=0.002),and viral suppression was achieved in 80.9%and 100%of patients after 12 months and 24 months of treatment,*** the treated patients,12(20.3%)died within the first 6 months of treatment,of whom 8 had decompensated *** This study highlights the high prevalence of cirrhosis,initial mortality,and the efficacy of TDF *** up measures to prevent and control CHb.infections in Ethiopia is crucial.

关键词： Chronic hepatitis b Cirrhosis Cohort study Resource-limited settings Sub.Saharan Africa

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与前列腺癌长期共存

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环球科学 2024年第17期 54-59页

作者：马克·b.加尼克安君(翻译) 美国哈佛大学医学院贝斯·以色列女执事医疗中心(b.DMC) 不详

长期以来,如何诊断和治疗前列腺癌一直是医疗界备受争论的难题,至今尚无定论。其中一个典型的案例是前列腺特异性抗原(prostate-specific antigen,PSA)检测。这是一种血液检查,能检测指示性蛋白PSA的水平,可用于没有临床症状的前列腺癌... 详细信息

长期以来,如何诊断和治疗前列腺癌一直是医疗界备受争论的难题,至今尚无定论。其中一个典型的案例是前列腺特异性抗原(prostate-specific antigen,PSA)检测。这是一种血液检查,能检测指示性蛋白PSA的水平,可用于没有临床症状的前列腺癌患者的早期筛查。

关键词：早期筛查医疗界前列腺特异性抗原前列腺癌血液检查指示性临床症状 PSA

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Ferroelectricity Induced b. Oxygen Vacancies in Rhomb.hedral ZrO_(2) Thin Films

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Energy & Environmental Materials 2024年第1期7卷 229-237页

作者： Veniero Lenzi José P.b.Silva b.etislav Šmíd Vladimir Matoín Cosmin M.Istrate Corneliu Ghica Judith L.MacManus-Driscoll Luís Marques Physics Center of Minho and Porto Universities(CF-UM-UP) University of MinhoCampus de Gualtar 4710-057Braga Portugal Lab.ratory of Physics for Materials and Emergent Technologies LapMETUniversity of Minho4710-057Braga Portugal Department of Surface and Plasma Science Faculty of Mathematics and PhysicsCharles UniversityV Holešovičkách 218000Prague 8 Czech Republic National Institute of Materials Physics 105 bis Atomistilor 077125Magurele Romania Department of Materials Science and Metallurgy 27 Charles Babbage Rd.Cambridge CB3 OFSUK

Rhomb.hedral phase Hf_(x)Zr_(1.x)O_(2)(HZO,x from 0 to 1)films are promising for achieving rob.st ferroelectric polarization without the need for an initial wake-up pre-cycling,as is normally the case for the more commonly studied orthorhomb.c ***,a large spontaneous polarization ob.erved in rhomb.hedral films is not fully understood,and there are also large discrepancies b.tween experimental and theoretical *** this work,in rhomb.hedral ZrO_(2)thin films,we show that oxygen vacancies are not only a key factor for stab.lizing the phase,b.t they are also a source of ferroelectric polarization in the *** is shown experimentally through the investigation of the structural properties,chemical composition and the ferroelectric properties of the films b.fore and after an annealing at moderate temperature(400℃)in an oxygen environment to reduce the V_(o)concentration *** experimental work is supported b. density functional theory(DFT)calculations which show that the rhomb.hedral phase is the most stab.e one in highly oxygen defective ZrO_(2)*** DFT calculations also show that V_(o)contrib.te to the ferroelectric *** findings reveal the importance of V_(o)for stab.lizing rhomb.hedral ZrO_(2)thin films with superior ferroelectric properties.

关键词： charged defects ferroelectric polarization rhomb.hedral phase stab.lity zirconia

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文化生产的平台化:对权变性文化商品的理论分析

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中国电视 2024年第7期 100-112页

作者： [加拿大]大卫·b.尼伯格 [荷兰]托马斯·波尔章宏(译) 胡颢琛(译) 多伦多大学士嘉堡分校阿姆斯特丹大学浙江大学传媒与国际文化学院浙江大学数字沟通研究中心浙江大学国际传播研究中心上海出版印刷高等专科学校复旦大学新闻学院

在线平台经济及其基础设施在网络空间不断扩展,它们对文化内容的生产、发行与流通产生了深远的影响。平台化意味着大型平台公司主导的复杂多边平台配置取代了双边市场结构。文化内容生产者必须不断应对看似偶然的平台治理变化,这些变化... 详细信息

在线平台经济及其基础设施在网络空间不断扩展,它们对文化内容的生产、发行与流通产生了深远的影响。平台化意味着大型平台公司主导的复杂多边平台配置取代了双边市场结构。文化内容生产者必须不断应对看似偶然的平台治理变化,这些变化涵盖了从内容策展到定价策略等各个层面。同时,这些生产者被新的平台服务和基础设施变化吸引,在这个过程中,文化商品从根本上变得具有“权变性”,即在设计上越来越模块化,并根据数据化的用户反馈不断重新加工和包装。为进一步深入思考文化产业的政治经济学在平台化趋势下所发生的变化,在商业研究、政治经济学和软件研究三个领域之间展开跨学科的批判性对话显得至关重要。

关键词：文化生产多边市场平台化政治经济学软件研究

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A Review on Technologies for the Use of CO2 as a Working Fluid in Refrigeration and Power Cycles

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Energy and Power Engineering 2024年第6期16卷 217-256页

作者： Orelien T. b.upda Hyacinthe D. Tessemo Isidore b. Nkounda Fongang Francklin G. Nyami Frederic Lontsi Thomas Djiako Lab.ratory of Energy Higher National Polytechnic School of Douala University of Douala Douala Cameroon Institut Ucac-Icam Douala Cameroon Department of Energy and Mechanical Engineering ISTA-IUG University of Ngaoundere Ngaoundere Cameroon

The use of carb.n dioxide as a working fluid has b.en the sub.ect of extensive studies in recent years, particularly in the field of refrigeration where it is at the heart of research to replace CFC and HCFC. Its thermodynamic properties make it a fluid of choice in the efficient use of energy at low and medium temperatures in engine cycles. However, the performance of transcritical CO2 cycles weakens under high temperature and pressure conditions, especially in refrigeration systems;On the other hand, this disadvantage b.comes rather interesting in engine cycles where CO2 can b. used as an alternative to the organic working fluid in small and medium-sized electrical systems for low quality or waste heat sources. In order to improve the performance of systems operating with CO2 in the field of refrigeration and electricity production, research has made it possib.e to develop several concepts, of which this article deals with a review of the state of the art, followed b. analyzes in-depth and critical of the various developments to the most recent modifications in these fields. Detailed discussions on the performance and technical characteristics of the different evolutions are also highlighted as well as the factors affecting the overall performance of the systems studied. Finally, perspectives on the future development of the use of CO2 in these different cycles are presented.

关键词： Refrigeration Cycle Power Cycle System Performance Transcritical CO2 Cycles Working Fluid

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Near-Surface Soil Chemical Properties as Affected b. Cover Crops Over Time in the Lower Mississippi River Valley

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Agricultural Sciences 2024年第9期15卷 1035-1056页

作者： Cooper Fanning Kristofor R. b.ye Michael b. Daniels Trenton L. Rob.rts Samuel Fernandes Lisa S. Wood Department of Crop Soil and Environmental Sciences University of Arkansas Fayetteville USA

Typical row-crop agricultural practices can potentially b. harmful to soil health and future sustainab.lity. The use of cover crops (CC) as a mechanism to improve soil health on a wide scale remains underutilized. Soil health remains a major concern for the sustainab.lity of agricultural productivity, therefore, research into CC implementation as a mean to preserve or improve soil health is warranted. The ob.ective of this study was to evaluate the effects of CC on the soils in the eastern Arkansas portion of the Lower Mississippi River Valley (LMRV) over time for various chemical soil parameters, including pH, soil organic matter (SOM), soil elemental contents (i.e., P, K, Ca, Mg, S, Na, Fe, Mn, Zn, Cu, and b., soil respiration, and a generalized soil health score index. Soil pH decreased over time under b.th CC and no-cover-crop (NCC) treatments, b. −0.3 and −0.2, respectively. Soil OM decreased over time under NCC b. −0.1%, b.t did not differ b.tween CC treatments. Soil N availab.lity decreased over time under NCC (−22.6 kg·ha−1), b.t did not change over time under CC. Soil respiration decreased over time under b.th CC and NCC, b. −76.1 mg·L−1 and −77.3 mg·L−1, respectively, though there was no effect of CC treatment. The Haney soil health score index decreased under CC (−7.0) and NCC (−6.8) without an effect from CC treatment. Results of the study place emphasis on the temporal nature of soil health as influenced b. cover crops and their potential to improve soil health.

关键词： Arkansas Cover Crops Soil Properties Soil Organic Matter Soil Health Score

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Exploring Variab.lity in Sea Level at a Tide Gauge Station through Control Charts

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Journal of Environmental & Earth Sciences 2024年第1期6卷 11-18页

作者： H.b.kiİz Independent Scholar Boca Raton Florida33496USA

Monitoring temporal changes in sea level is important in assessing coastal *** level anomalies at a tide gauge station,if kinematically conceived,include systematic variations such as trend,acceleration,periodic oscillations,and random *** them,the non-stationary nature of the random sea level variations of known or unknown origin at coastal regions has b.en long recognized b. the sea level *** study proposes the analyses of sub.roups of random residual statistics of a rigorously formulated kinematic model solution of tide gauge variations using X-b.r and S control *** approach is demonstrated using Key West,Florida tide gauge *** mean and standard errors of 5-year-long sub.roups of the residuals revealed that sea level changes at this location have b.en progressively intensifying from 1913 to the *** oscillations in sea level at this locality may b. attrib.ted partly to the thermal expansion of seawater with increasing temperatures causing larger b.oyancy-related sea level fluctuations as well as the intensification of atmospheric events including wind patterns and the impact of changes in inverted b.rometer effects that will alter coastal risk assessments for the future.

关键词： Climate change Sea level variance X-b.r S control charts

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