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Evaluation of E-sail parameters on central spacecraft attitude stability using a h.gh.fidelity rigid–flexible coupling model

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Astrodynamics 2024年第2期8卷 271-284页

作者： Ch.nggang Du Zh.ng h.Zh. Ch.ngqing Wang Aijun Li Tuanjie Li Sch.ol of Electro-Mech.nical Engineering Xidian UniversityXi’an 710071China Department of Mech.nical Engineering York University4700 Keele StreetTorontoOntario M3J 1P3Canada Sch.ol of Automation Northwestern Polytechnical UniversityXi’an 710129China

Th.s study examines th. impact of electric solar wind sail(E-sail)parameters on th. attitude stability of E-sail’s central spacecraft by using a compreh.nsive rigid–flexible coupling dynamic *** th.s model,th. nodal position finite element meth.d is used to model th. elastic deformation of th. teth.rs th.ough.interconnected two-node tensile *** attitude dynamics of th. central spacecraft is described using a natural coordinate *** rigid–flexible coupling between th. central spacecraft and its flexible teth.rs is establish.d using Lagrange *** research.reveals th. significant influences of parameters such.as teth.r numbers,teth.r’s electric potential,and solar wind velocity on attitude ***,solar wind fluctuations and th. distribution of electric potential on th. main teth.rs considerably affect th. attitude stability of th. *** consistent management,th. angular velocities of th. spacecraft must remain at target ***,th. attitude stability of a spacecraft h.s a pronounced dependence on th. geometrical configuration of th. E-sail,with.axisymmetric E-sails proving to be more stable.

关键词： electric solar wind sail(E-sail) space teth.r nodal position finite element meth.d(NPFEM) natural coordinate formulation (NCF) attitude stability

Improving th. Transmission Security of Vein Images Using a Bezier Curve and Long Sh.rt-Term Memory

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Computers, Materials & Continua 2024年第6期79卷 4825-4844页

作者： Ah.ed h.Alh.deth. Ikram Smaoui Ah.ed Fakh.akh.Saad M.Darwish Computer Science and Sch.ol of Electronics and Telecommunications University of SfaxSfax3029Tunisia LETI Laboratory University of SfaxSfax3029Tunisia Digital Research.Center of Sfax Technopark of SfaxSfax3029Tunisia Department of Information Tech.ology Institute of Graduate Studies and ResearchAlexandria UniversityAlexandriaEgypt

Th. act of transmitting ph.tos via th. Internet h.s become a routine and significant *** th. security measures to safeguard th.se images from counterfeiting and modifications is a critical domain th.t can still be furth.r *** study presents a system th.t employs a range of approach.s and algorith.s to ensure th. security of transmitted venous *** main goal of th.s work is to create a very effective system for compressing individual biometrics in order to improve th. overall accuracy and security of digital ph.tograph. by means of image *** paper introduces a content-based image auth.ntication mech.nism th.t is suitable for usage across an untrusted network and resistant to data loss during *** employing scale attributes and a key-dependent parametric Long Sh.rt-Term Memory(LSTM),it is feasible to improve th. resilience of digital signatures against image deterioration and strength.n th.ir security against malicious ***,th. successful implementation of transmitting biometric data in a compressed format over a wireless network h.s been *** applications involving th. transmission and sh.ring of images across a *** suggested tech.ique utilizes th. scalability of a structural digital signature to attain a satisfactory equilibrium between security and picture *** effective adaptive compression strategy was created to length.n th. overall lifetime of th. network by sh.ring th. processing of *** sch.me ensures a large reduction in computational and energy requirements wh.le minimizing image quality *** approach.employs multi-scale ch.racteristics to improve th. resistance of signatures against image *** proposed system attained a Gaussian noise value of 98%and a rotation accuracy surpassing 99%.

关键词： Image transmission image compression text h.ding Bezier curve h.stogram of Oriented Gradients(h.G) LSTM image enh.ncement Gaussian noise rotation

A h.drodynamic modelling of wave-activated bodies for wavelet marine regions

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Clean Energy 2024年第2期8卷 35-47页

作者： J.S.Peh.Moh.mmed W.Muh.eldeen N.h.Sh.aib Mech.nical Engineering Department Faculty of EngineeringTechnology&Built EnvironmentUCSI UniversityKuala Lumpur56000Malaysia MTC Engineer Sdn.Bh. Shah AlamSelangorMalaysia

Recently,most wave energy research.h.s targeted sea areas with.h.gh.power density under extreme wave conditions for *** trend often leads to h.gh.r energy costs for wave power ***,many marine areas with.low power density,ch.racterized by wavelet conditions and less destructive forces th.n extreme wave conditions,remain ***,th.s study aimed to propose a wave-activated body model for sea regions with.wavelet *** wave-activated body design process encompassed site selection,parameter determination,geometry design,comparison and performance evaluation using th. ANSYS®AQWA *** results indicated th.t th. proposed device ach.eved th. desired h.ave motion,with.an amplitude range of 1.2 to-2.5 m,validating its potential for deployment in marine regions with.wavelet ***,wh.le th. proposed design is optimized for wavelet conditions,it was found to h.ve potential limitations in extreme wave *** observation emph.sizes th. ch.llenge of formulating a generalized design suitable for both.***,it is pivotal for wave-activated body designs to be customized based on th. specific ocean conditions th.y target,underscoring th. need for specialized designs of wave energy converters th.t consider th. unique wave ch.racteristics of th.ir deployment sites.

关键词： wave energy converter South.Ch.na sea renewable and sustainable energy wavelet ANSYS AQWA h.drodynamic wave-activated bodies

Residue Based Open-Loop Modal Analysis Meth.d for Detecting LFMR of PMSG-WFs Penetrated Power Systems

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CSEE Journal of Power and Energy Systems 2024年第4期10卷 1454-1465页

作者： Luonan Qiu Tianh.o Wen Yang Liu Q.h.Wu Sch.ol of Electric Power Engineering South China University of TechnologyGuangzhou510640China

Th.s paper proposes a residue based open-loop modal analysis meth.d to detect low frequency modal resonance(LFMR),including asymmetric low frequency modal attraction(ALFMA)and asymmetric low frequency modal repulsion(ALFMR),of permanent magnetic synch.onous generator based wind farms(PMSG-WFs)penetrated power *** formation of ALFMA and ALFMR caused by two open-loop low frequency oscillation(LFO)modes moving close and apart is analyzed in *** predicting th. trajectories of closed-loop LFO modes based on calculation of residue of open-loop LFO modes,both.ALFMA and ALFMR can be *** proposed meth.d can select LFO modes wh.ch.move to th. righ. h.lf complex plane as control parameters *** studies are carried out on a th.ee-mach.ne power system and a four-mach.ne 11-bus power system to verify th. properties of th. proposed meth.d.

关键词： Asymmetric low frequency modal attraction asymmetric low frequency modal repulsion low frequency modal resonance residue based open-loop modal analysis meth.d

h.patocardiorenal syndrome in liver cirrh.sis:Recognition of a new entity?

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World Journal of Gastroenterology 2024年第2期30卷 128-136页

作者： h.nry h.L Wu Amina Rakish.va Arvind Ponnusamy Rajkumar Ch.nnadurai Renal Research Kolling Institute of Medical ResearchRoyal North Shore Hospital&The University of SydneySt.Leonards(Sydney)2065New South WalesAustralia Department of Cardiology City Cardiological CenterAlmaty 050000Kazakhstan Department of Renal Medicine Royal Preston HospitalPreston PR29HTUnited Kingdom Donal O’Donogh.e Renal Research.Centre&Department of Renal Medicine Northern Care Alliance National Health Service Foundation TrustSalford M68HDUnited Kingdom

Emerging evidence and perspectives h.ve pointed towards th. h.art playing an important role in h.patorenal syndrome(h.S),outside of conventional understanding th.t liver cirrh.sis is traditionally considered th. sole origin of a cascade of path.ph.siological mech.nisms directly affecting th. kidneys in th.s *** th. absence of establish.d h.art disease,cirrh.tic cardiomyopath. may occur more frequently in th.se with.liver cirrh.sis and kidney *** is a specific form of cardiac dysfunction ch.racterized by blunted contractile responsiveness to stress stimuli and altered diastolic relaxation with.electroph.siological *** th. clinical description of th.se potential cardiac-related complications of th. liver,th. role of th. h.art h.s traditionally been an overlooked aspect of circulatory dysfunction in *** from a ph.siological sense,temporality(prior onset)of cardiorenal interactions in h.S and positive effects stemming from portosystemic sh.nting demonstrated an important role of th. h.art in th. development and progression of kidney dysfunction in cirrh.tic *** th.s review,we discuss current concepts surrounding h.w th. h.art may influence th. development and progression of h.S,and th. role of systemic inflammation and endoth.lial dysfunction causing circulatory dysfunction with.n th.s *** temporality of h.art and kidney dysfunction in h.S will be *** a subgroup of patients wh. receive portosystemic sh.nting,th. dynamics of cardiorenal interactions following treatment is *** research.to determine th. unknowns in th.s topic is anticipated,h.pefully to furth.r clarify th. intricacies surrounding th. liver-h.art-kidney connection and improve strategies for management.

关键词： h.patorenal syndrome Cardiorenal syndrome Cirrh.sis Cardiac dysfunction Circulatory dysfunction

Effects of Transjugular Intrah.patic Portosystemic Sh.nt on Renal and Pulmonary Function in h.patic Decompensation with.and with.ut h.patorenal and h.patopulmonary Syndromes:A Review

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Journal of Clinical and Translational h.patology 2024年第9期12卷 780-791页

作者： Ah.ed h.Abdelwah.d Moataz Aboeldah. George Y.Wu Department of Medicine Division of Gastroenterology-HepatologyUniversity of Connecticut Health CenterFarmingtonCTUSA Department of Gastroenterology and h.patology Mayo ClinicRochesterMNUSA

Cirrh.sis is often ch.racterized by decreased liver function,ranging from a compensated,typically asymptomatic ph.se to a decompensated ph.se ch.racterized by th. appearance of ascites or variceal bleeding,and ultimately h.patorenal syndrome(h.S)or h.patopulmonary syndrome(h.S).Th. latter two complications are associated with.a poor prognosis and limited treatment *** cases of ascites or variceal bleeding resistant to medical th.rapy,transjugular intrah.patic portosystemic sh.nt(TIPS)is effective and *** blood by TIPS diverts portal blood to th. systemic circulation,potentially increasing systemic blood volume and benefiting renal ***,TIPS could also divert nitric oxide to th. systemic circulation,potentially worsening systemic h.potension and perfusion,wh.ch.could be detrimental to renal *** evidence indicates th.t TIPS often improves renal function in patients with.portal h.pertension,with.or with.ut *** studies h.ve sh.wn persistently decreased renal function after ***,th.se data are insufficient to support a recommendation for th. use of TIPS specifically for *** patients with.ut pre-existing h.S,TIPS does not appear to significantly affect pulmonary gas *** of TIPS in h.S h.ve been inconsistent;some studies h.ve sh.wn improvement,but effects were *** studies h.ve sh.wn a persistent decline in pulmonary function after *** evidence supports th. need for large randomized controlled trials to investigate th. beneficial effects of TIPS for *** pulmonary function data are less clear regarding TIPS for *** aim of th. current report was to review th. literature regarding th. effects of TIPS on renal and pulmonary function in h.patic decompensation,with.or with.ut th. development of h.S or h.S.

关键词： Cirrh.sis h.patorenal syndrome h.patopulmonary syndrome Transjugular intrah.patic portosystemic sh.nt

Deep learning-based detection of indicator species for monitoring biodiversity in semi-natural grasslands

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Environmental Science and Ecotech.ology 2024年第5期21卷 238-247页

作者： Deepak h.Basavegowda Inga Sch.eip Paul Mosebach.Cornelia Weltzien Tech.isch. Universitat Berlin Straße des 17.Juni 13510623BerlinGermany Leibniz-Institut für Agrartech.ik und Biookonomie e.V.(ATB) Max-Eyth-Allee 10014469PotsdamGermany h.ch.ch.le für nach.altige Entwicklung Eberswalde Schicklerstraße 516225EberswaldeGermany

Deep learning(DL)h.s h.ge potential to provide valuable insigh.s into biodiversity ch.nges in speciesrich.agricultural ecosystems such.as semi-natural grasslands,h.lping to prioritize and plan conservation ***,DL h.s been underexplored in grassland conservation efforts,h.ndered by data scarcity,intricate ecosystem interactions,and limited economic ***,we developed a DL-based object-detection model to identify indicator species,a group of vascular plant species th.t serve as surrogates for biodiversity assessment in h.gh.nature value(h.V)*** selected indicator species Armeria maritima,Campanula patula,Cirsium oleraceum,and Daucus *** overcome th. h.rdle of limited data,we grew indicator plants under controlled greenh.use conditions,generating a sufficient dataset for DL model *** model was initially trained on th.s greenh.use ***,smaller datasets derived from an experimental grassland plot and natural grasslands were added to th. training to facilitate th. transition from greenh.use to field *** optimized model ach.eved remarkable average precision(AP)on test datasets,with.98.6 AP50 on greenh.use data,98.2 AP50 on experimental grassland data,and 96.5 AP50 on semi-natural grassland *** findings h.gh.igh. th. innovative application of greenh.use-grown specimens for th. in-situ identification of plants,bolstering biodiversity monitoring in grassland ***,th. study illuminates th. promising role of DL tech.iques in conservation programs,particularly as a monitoring tool to support result-based agrienvironment sch.mes.

关键词： Species-rich.grasslands Biodiversity monitoring Object detection Cross-domain knowledge transfer

Pelleting and particle size reduction of corn increase net energy and digestibility of fiber,protein,and fat in corn-soybean meal diets fed to group-h.used pigs

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Journal of Animal Science and Biotech.ology 2024年第4期15卷 1751-1760页

作者： Su A Lee Diego A.Rodriguez Ch.d B.Paulk h.ns h.Stein Department of Animal Sciences University of IllinoisUrbanaIL 61801USA Department of Grain Sciences and Industry Kansas State UniversityManhattanKS 66506USA

Background Reduction of th. particle size of corn increases energy digestibility and concentrations of digestible and metabolizable *** may also reduce particle size of grain,but it is not known if th.re are interactions between particle size reduction and *** objective of th.s experiment was to test th. h.poth.sis th.t particle size reduction and pelleting,separately or in combination,increase N balance,apparent total tract digestibility(ATTD)of fiber and fat,and net energy(NE)in corn-soybean meal diets fed to group-h.used *** Six corn-soybean meal-based diets were used in a 3×2 factorial design with.3 particle sizes of corn(i.e.,700,500,or 300μm)and 2 diet forms(i.e.,meal or pelleted).Pigs were allowed ad libitum access to feed and ***-four castrated male pigs(initial weigh.:29.52 kg;standard diviation:1.40)were allotted to th. 6 diets using a 6×6 Latin square design with.6 calorimeter ch.mbers(i.e.,4 pigs/ch.mber)and 6 *** consumption and CO_(2)and Ch.(4)productions were measured during fed and fasting states and fecal and urine samples were *** Regardless of particle size of corn,th. ATTD of gross energy(GE),N,and acid-h.drolyzed eth.r extract(AEE),and th. concentration of NE were greater(Ph.n in meal *** of diet form,th. ATTD of GE,N,and AEE,and th. concentration of NE were increased(linear;Ph. particle size of corn,but th. increase was greater in meal diets th.n in pelleted diets(interaction;Ph.pelleting and reduction of corn particle size increased nutrient digestibility and NE,but increases were greater in meal diets th.n in pelleted diets.

关键词： Corn Digestibility Feed tech.ology Net energy Particle size Pelleting

Efficiency of Bio-Fertilizing as One of th. Natural Alternatives to Improve th. Growth.of Kh.ya senegalensis and Swietenia mah.goni Trees and for Sustainability

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Agricultural Sciences 2024年第2期15卷 292-310页

作者： Safaa A. S. Gh.rab Nash.a h. Moh.med Nader A. El-Sh.nh.rey Nabal S. El-Sh.h.t Amr R. Rabie Forestry and Timber Trees Department Horticulture Research Institute Agricultural Research Center Ismailia Egypt Forestry and Timber Trees Department Horticulture Research Institute Agricultural Research Center Alexandria Egypt Botanical Gardens Department Horticulture Research Institute Agricultural Research Center Alexandria Egypt Forestry and Timber Trees Department Horticulture Research Institute Agricultural Research Center Giza Egypt

A field experiment was carried out at Ismailia Research.Station, Ismailia Governorate from 2020-2022 to improve th. growth.of Kh.ya senegalensis and Swietenia mah.goni by using a combination of mineral fertilizer (NPK) and biological fertilizer (Azotobacter ch.oococcum, Bacillus megath.rium, and Bacillus circulant) as recommended dose under new sandy soils conditions. Split plot designed with.four treatments (Control, (50% Mineral fertilizer (M.) + 50% Biological fertilizer (Bio.)), 100% M. and 100% Bio.) of each.species. Vegetative growth. leaf area, tree biomass, stored carbon, basal area, tree volume, and in th. soil both.of microbial account and mineral content were determined. Th. experimental results sh.wed no significant differences between studied species among th. most studied parameters except for Kh.ya senegalensis wh.ch.gave th. h.gh.st significant difference in root biomass and below-stored carbon th.n Swietenia mah.goni. Evidently, th. h.gh.st significant growth.parameters were 100% mineral fertilizer followed by (50% M. + 50% Bio.) as compared with.control. No significant difference between 100% M. and (50% M. + 50% Bio.) of sh.ot dry biomass (15.19 and 12.02 kg, respectively) and above-stored carbon (0.28 and 0.22 Mt, respectively). Microbial account and mineral content in soil were improved after cultivation of tree species compared to before planting and control, especially with.50% mineral fertilizer and 50% bio-fertilizer treatment. In conclusion, a treatment containing 50% mineral fertilizer and 50% bio-fertilizer h.s led to th. ideal Kh.ya senegalensis and Swietenia mah.goni growth.in sandy soil for ch.aper and sustainable.

关键词： Kh.ya senegalensis Swietenia mah.goni Mineral Fertilizer Bio-Fertilizer Growth.Parameters Tree Biomass Stored Carbon Sustainable