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Kinetics and thermodynamic studies of Methyl orange removal by polyvinylidene fluoride-PEdot mats

Journal of Environmental Sciences 2021年第2期33卷 62-73页

作者： Romario J.da Silva Lizeth Carolina Mojica-Sanchez Filipe D.S.Gorza Graciela C.Pedro Bruna G.Maciel Gabriela P.Ratkovski Herica D.daRocha kamila t.o.do nascimento Juan CMedina-Llamas Alicia E.Chavez-Guajardo Jose J.Alcaraz-Espinoza Celso P.de Melo Program a de Pos-Graduagao em Ciencia de Materials U niversidade Federal de Pernambuco50670-901 RecifePEBrazil Departamento de Ffsica Uniuersidade Federal de Pemambiico50670-901 Reci/ePEBrazil Centro de Estudios Cientificosy tecnologicos No.18 Instituto Politecnico Nacional98160 ZacatecasZacMexico Unidad Academica de Ciencias de la tierra Uniuersidad Aut6noma de Zacatecas98058 ZacatecasZacMexico Departamento de Quimica Universidad Autonoma Metropolitana09340Ciudad de MexicoMexico

We report the preparation of poly(3,4-ethylene dioxythiophene)(PEdot)-modified polyvinylidene fluoride electrospun fibers and their use as a novel adsorbent material for the removal of the anionic dye Methyl orange(Mo)from aqueous *** novel adsorbent material can be used to selectively remove Mo on a wide p H range(3.0-10.0),with a maximum capacity of 143.8 mg/g at p H *** used in a recirculating filtration system,the maximum absorption capacity was reached in a shorter time(20 min)than that observed for batch mode experiments(360 min).Based on the analyses of the kinetics and adsorption isotherm data,one can conclude that the predominant mechanism of interaction between the membrane and the dissolved dye molecules is ***,considering the estimated values for the Gibbs energy,and entropy and enthalpy changes,it was established that the adsorption process is spontaneous and occurs in an endothermic *** good mechanical and environmental stability of these membranes allowed their use in at least 20 consecutive adsorption/desorption cycles,without significant loss of their *** suggest that the physical-chemical characteristics of PEdot make these hybrid mats a promising adsorbent material for use in water remediation protocols and effluent treatment systems.

关键词： Electrospinning Composite mats Pedot Pvdf mats Dye removal Water remediation

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Vegetation dynamics at the southern edge of the Siberian mountain taiga

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Journal of Mountain Science 2025年第2期22卷 451-465页

作者： IM Sergei t KHARUK Viacheslav I PEtRoV Il'ya A SHUSHPANoV Alexander S DVINSKAYA Maria L oNDAR Sergei o V.N.Sukachev Institute of Forest Krasnoyarsk Science Centre of the Siberian Branch of Russian Academy of ScienceKrasnoyarsk 660036Russia Institute of Ecology and Geography Institute of Space and Information TechnologiesSiberian Federal UniversityKrasnoyarsk 660041Russia Laboratory of Biodiversity and Ecology Tomsk State UniversityTomsk 634050Russia Institute of Space Research and High technologies Reshetnev Siberian State University of Science and TechnologyKrasnoyarsk 660014Russia Department of Biology and Ecology Tuvan State UniversityKyzyl 667000Russia

the growth,survival,and mortality of conifer species in response to the hydrothermal regime have received considerable *** is expected that the highest sensitivity of trees to the warming-drying climate will occur mainly at the edges of the species *** focused on the responses to climate change of the drought-resistant larch(Larix sibirica)and the moisture-sensitive Siberian pine(Pinus sibirica)along the elevation gradient in the tannu-ola Ridge,the southern margin where those two species coexist in Siberia by using satellite data(MoDIS,Landsat,and microwave),the indexes of gross(GPP)and net(NPP)primary productivity,and tree radial growth index(GI).We found that since the warming restart in the 2000s,the area of larch-dominated forests increased by~150%while the area of pine-dominated forests decreased by~10%.the Siberian pine has retreated at low elevations(ts area at higher *** contrast,the area of larch stands increased in both the uphill and downhill ***(Betula spp.)also increased its area at low elevations(about+120%).Since 2001,the forested area increased by~5%.A shrubification,i.e.,an increase in the area of shrubs,was observed at high *** uphill rate of timberline and shrubline migration was about 0.3 m/*** the 2000s,vegetation NPP has increased by 13%.A notable correlation between NPP and the GI of larch and pine was found(r=0.5-0.7).At lower elevations,NPP positively correlated with precipitation and soil moisture,while air temperature and VPD(vapor pressure deficit)increase inhibited *** high elevations,the effects of these variables on productivity *** continuous decline of the Siberian pine forest indicates an inevitable retreat of this species at low elevations and its replacement by larch and birch.

关键词： trees range changes Mountain taiga Siberian larch Siberian pine timberline Shrubification tree uphill migration Forest population dynamics Ecological resilience Habitat suitability

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on the Singular Effects in the Relativistic Landau Levels in Graphene with a Disclination

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Communications in theoretical Physics 2018年第12期69卷 817-822页

作者： Rosinildo F.do nascimento Diego Cogollo Edilberto o.Silva Moisés Rojas Cleverson Filgueiras Instituto de Fisica Universidade Federal de UberlandiaUberlandiaMGBrasil Unidade Academica de Fisica Universidade Federal de Campina GrandePOB 1007158109-970Campina Grande-PB Brazil Departamento de Fisica Universidade Federal do Maranhao65085-580Sao Luis-MABrazil Departamento de Fisica Universidade Federal de LavrasCaixa Postal 303737200-000Lavras-MGBrazil

the effect of a pseudo Aharonov-Bohm(AB) magnetic field generated by a disclination on a two-dimensional electron gas in graphene is addressed in the continuum limit within the geometric approach. the influence of the coupling between the spinor fields and the singular conical curvature is investigated, which shows that singularities have pronounced impact in the Hall conductivity. Moreover, the degeneracy related to the Dirac valleys is broken for negative values of the angular momentum quantum numbers, ?, including ? ≡ 0. In this case, a Hall plateau develops at the null filling factor. obtaining the Hall conductivity by summing over the positive and the negative ?′s, the null Landau level is recovered and the plateau at the null filling factor disappears. In any case, the standard plateaus, which are seen in a flat graphene are not obtained with these curvature and singular effects.

关键词： Landau Levels Hall conductivity Graphene Elastic deformations

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Aerodynamic Effects Compensation on Multi-Rotor UAVs Based on a Neural Network Control Allocation Approach

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IEEE/CAA Journal of Automatica Sinica 2022年第2期9卷 295-312页

作者： Sarah P.Madruga Augusto H.B.M.tavares Saulo o.D.Luiz tiago P.do nascimento Antonio Marcus N.Lima Graduate Program of Electrical Engineering Universidade Federal de Campina GrandeCampina Grande-PBBrazil Department of Electrical Engineering Universidade Federal de Campina GrandeCampina Grande-PBBrazil IEEE Department of Computer Systems Universidade Federal da ParaibaJoao Pessoa-PBBrazil

this paper shows that the aerodynamic effects can be compensated in a quadrotor system by means of a control allocation approach using neural ***,the system performance can be improved by replacing the classic allocation matrix,without using the aerodynamic inflow equations *** network training is performed offline,which requires low computational *** target system is a Parrot MAMBo drone whose flight control is composed of PD-PID controllers followed by the proposed neural network control allocation *** a quadrotor is particularly susceptible to the aerodynamics effects of interest to this work,because of its small *** compared the mechanical torques commanded by the flight controller,i.e.,the control input,to those actually generated by the actuators and established at the *** was observed that the proposed neural network was able to closely match them,while the classic allocation matrix could not achieve *** allocation error was also determined in both ***,the closed-loop performance also improved with the use of the proposed neural network control allocation,as well as the quality of the thrust and torque signals,in which we perceived a much less noisy behavior.

关键词： Aerodynamics effects control allocation minidrone multi-rotor UAV neural networks

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transport mechanism in chemically reactive hybrid nanofluid flow containing gyrotactic micro-organisms over a curved oscillatory surface

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Applied Mathematics and Mechanics(English Edition) 2025年第1期46卷 177-192页

作者： M.NAVEED M.IMRAN t.ASGHAR Z.ABBAS Department of Mathematics Division of Science and TechnologyUniversity of Education Department of Mathematics The Islamia University of Bahawalpur

this paper examines the transport analysis, including both heat transfer and mass transfer, in hybrid nanofluid flow containing gyrotactic microorganisms towards a curved oscillatory surface. the influence of magnetic fields is also inspected in terms of their physical characteristics. to depict the phenomena of transport, modified versions of both Fick's and Fourier's laws are used. Additionally, the characteristics of both heterogeneous and homogeneous chemical reactions are also incorporated. Utilizing a curvilinear coordinate system, the flow problem is formulated as partial differential equations(PDEs)for momentum, concentration, microorganism field, and energy. An analytical solution to the obtained flow equations is achieved utilizing the homotopy analysis method(HAM).the effects of significant flow parameters on the pressure and microorganism fields, velocity, oscillation velocity, concentration, and temperature distributions are shown via graphs. Furthermore, the variations in skin friction, mass transfer rate, heat transfer rate, and local motile number due to different involved parameters are presented in tables and are analyzed in detail. Graphical results indicate that the curves of velocity and temperature fields are enhanced as the values of the solid volume fraction variables *** is also verified that the concentration rate field decreases as the values of the homogeneous reaction strength parameter and the radius of curvature parameter increase, and it increases with the Schmidt number and the heterogeneous reaction strength *** outcomes show a favorable response of the motile number to advanced values of the Peclet number, the Schmidt number, the microorganism difference parameter, and the bio-convective Lewis number.

关键词： analytical solution Cattaneo-Christov heat and mass flux chemical reaction gyrotactic microorganism hybrid nanofluid o368 oscillating curved stretchable sheet

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Perspectives on new biomarkers in gastric cancer: Diagnostic and prognostic applications

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World Journal of Gastroenterology 2014年第33期20卷 11574-11585页

作者： Danilo do Rosário Pinheiro Wallax Augusto Silva Ferreira Mariceli Baia Leo Barros Mariana Diniz Araújo Symara Rodrigues-Antunes Bárbara do nascimento Borges Master Program of Animal Health and Production Federal Rural University of Amazonia Belém PA 66077-530 Brazil Molecular Biology Laboratory Biological Science Institute Federal University of Pará Belém PA 66075-110 Brazil Center of Agropecuary technology Socio-environmental and Hydric Resources Institute Federal Rural University of Amazonia Belém PA 66077-530 Brazil

Gastric cancer is considered one of the most deadly tumors worldwide. Even with the decline in its incidence, the mortality rate of this disease has remained high, mainly due to its late diagnosis and to the lack of precise prognostic markers. the main purpose of this review is to present genetic, epigenetic and proteomic molecular markers that may be used in a diagnostic and prognostic manner and to discuss the pros and cons of each type of marker for improving clinical practice. In this sense, we observed that the use of genetic markers, especially mutations and polymorphisms, should be carefully considered, as they are strongly affected by ethnicity. Proteomic-based markers show promise, but the higher costs of the associated techniques con-tinue to make this approach expensive for routine use. Alternatively, epigenetic markers appear to be very promising, as they can be detected in bodily fluids as well as tissues. However, such markers must be used carefully because epigenetic changes may occur due to environmental factors and aging. Despite the advances in technology and its access, to date, there are few defined biomarkers of prognostic and diagnostic use for gastric tumors. therefore, the use of a panel of several approaches(genetic, epigenetic and proteomic) should be considered the best alternative for clinical practice.

关键词： Molecular markers Epigenetic Genetic Proteomic Diagnosis Prognosis Gastric tumors

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Rat cardiomyocyte H9c2(2-1)-based sulforhodamine B assay as a promising in vitro method to assess the biological component of effluent toxicity

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Journal of Environmental Sciences 2020年第10期32卷 163-170页

作者： Elsa t Rodrigues Susana F nascimento Maria Joao Moreno Paulo J oliveira Miguel A Pardal University of Coimbra Centre for Functional EcologyDepartment of Life SciencesCalcada Martim de FreitasCoimbra 3000-456Portugal University of Coimbra Coimbra Chemistry CenterDepartment of ChemistryCoimbra 3004-535Portugal Centre for Neuroscience and Cell Biology Uniuersity of CoimbraUC BiotechBiocant ParkCantanhede 3060-197Portugal

the treatment of wastewaters is crucial to maintain the ecological status of receiving waters,and thereby guarantee the protection of aquatic life and human *** quality evaluation is conventionally based on physicochemical parameters,but increasing attention has been paid to integrate physicochemical and biological ***,the regulatory use of fish in biological testing methods has been subject to various ethical and cost concerns,and in vitro cell-based assays have thus become an important topic of ***,the present study intends:(a) to evaluate the efficiency of two different sample pre-concentration techniques (lyophilisation and solid phase extraction) to assess the toxicity of municipal effluents on rat cardiomyoblast H9c2(2-1) cells,and (b) maximizing the use of the effluent sample collected,to estimate the environmental condition of the receiving *** gathered results demonstrate that the H9c2(2-1) sulforhodamine B-based assay is an appropriate in vitro method to assess biological effluent toxicity,and the best results were attained by lyophilising the sample as *** to its response,the H9c2(2-1) cell line might be a possible alternative in vitro model for fish lethal testing to assess the toxicity of municipal *** physicochemical status of the sample suggests a high potential for eutrophication,and iron exceeded the permissible level for wastewater discharge,possibly due to the addition of ferric chloride for wastewater *** general,the levels of carbamazepine and sulfamethoxazole are higher than those reported for other countries,and both surpassed the aquatic protective values for long-term exposure.

关键词： Municipal wastewater treatment plant effluent Lyophilisation Solid phase extraction Cell-based assays H9c2(2-1)cell line SRB assay

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Maritime Security of S(?)o tom(?) and Pr(?)ncipe:Problems and Counter Measures

Maritime Security of S(?)o Tom(?) and Pr(?)ncipe:Problems an...

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作者： Kenente Forres Duarte do nascimento 华中师范大学

学位级别：硕士

圣多美和普林西比岛是一直被人们遗忘的岛屿,是殖民时期的耕地。16世纪,岛内引进并种植了甘蔗;到了 19世纪,群岛上种植了大量的可可和咖啡。在这一时期,该岛屿被认为是世界上最大的可可和咖啡生产国,但只是作为加勒比和巴西的奴隶港口... 详细信息

圣多美和普林西比岛是一直被人们遗忘的岛屿,是殖民时期的耕地。16世纪,岛内引进并种植了甘蔗;到了 19世纪,群岛上种植了大量的可可和咖啡。在这一时期,该岛屿被认为是世界上最大的可可和咖啡生产国,但只是作为加勒比和巴西的奴隶港口。众所周知,在当今时代,海洋为发展提供了宝贵的资源,对圣多美和普林西比岛来说更为重要。该地区拥有大量资源,如天然气,石油和生物资源。由于其良好的战略位置,效益就会更大,这就是注重海上安全和海洋战略的重要性。这在很大程度上刺激了就业、激发了圣多美和普林西比岛人的意志。但是在这个过程中还是出现了很多,人们逐渐发现了问题,并通过制定一系列措施去解决问题。当前,海盗、恐怖主义等一系列不良因素对海洋生态系统造成了严重的破坏,还有其他诸多罪行正在海上发生,海上安全逐渐成为许多国家关心的主题。因此,海上安全引起了很多国家的关注,特别是圣多美和普林西比岛的海上安全问题。同以前一样,圣多美和普林西比岛是世界各种大赛的举办地之一,这体现了它们地理位置的战略意义。因此,圣多美岛、普林西比岛都希望尽快在这里建一个深水港口,这样圣多美岛、普林西比岛将会成为向该地区提供货物和其他服务的重要港口通道。

关键词：圣多美和普林西比岛海上安全海洋战略

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Catalytic combustion of soot over Ru-doped mixed oxides catalysts

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Journal of Rare Earths 2014年第7期32卷 610-620页

作者： L.F.nascimento R.F.Martins o.A.Serra Department of Chemistry Faculdade de FilosofiaCiências e Letras de Ribeirao PretoUniversity of Sao PauloAv.Bandeirantes 3900CEP 14040-901 Ribeirao PretoSPBrazil

We employed modified substrates as outer heterogeneous catalysts to reduce the soot originating from the incomplete diesel combustion. Here, we proposed that ceria（Ceo2）-based catalysts could lower the temperature at which soot combustion occurred from 610 oC to values included in the operation range of diesel exhausts（270–400 oC）. Here, we used the sol-gel method to synthesize catalysts based on mixed oxides（Zno：Ceo2） deposited on cordierite substrates, and modified by ruthenium nanoparticles. the presence of Zno in these mixed oxides produced defects associated with oxygen vacancies, improving thermal stability, redox potential, sulfur resistance, and oxygen storage. We evaluated the morphological and structural properties of the material by X-ray diffraction（XRD）, Brumauer-emmett-teller method（BEt）, temperature programmed reduction（H2-tPR）, scanning electron microscopy（SEM）, and transmission electron microscopy（tEM）. We investigated how the addition of Ru（0.5 wt.%） affected the catalytic activity of Zno：Ceo2 in terms of soot combustion. thermogravimetric analysis（tG/DtA） revealed that presence of the catalyst decreased the soot combustion temperature by 250 oC, indicating that the oxygen species arose at low temperatures, which was the main reason for the high reactivity of the oxidation reactions. Comparative analysis of soot emission by diffuse reflectance spectroscopy（DRS） showed that the catalyst containing Ru on the mixed oxide-impregnated cordierite samples efficiently oxidized soot in a diesel stationary motor： soot emission decreased 80%.

关键词： soot combustion ceria mixed oxides ruthenium nanoparticles rare earths

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turning Industrial Waste into a Valuable Bioproduct:Starch from Mango Kernel Derivative to oil Industry Mango Starch Derivative in oil Industry

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Journal of Renewable Materials 2019年第2期7卷 139-152页

作者： Nívia do nascimento Marques Caroline Suzy do nascimento Garcia Liszt Yeltsin Coutinho Madruga Marcos Antônio Villetti Men de SáMoreira de Souza Filho Edson Noriyuki Ito Rosangela de Carvalho Balaban Instituto de Química Universidade Federal do Rio Grande do Norte-UFRNNatal59078970Brazil Departamento de Física Universidade Federal de Santa Maria-UFSMSanta Maria97105900Brazil Embrapa Agroindústria tropical Fortaleza60511-110Brazil Departamento de Engenharia de Materiais Universidade Federal do Rio Grande do Norte-UFRNNatal59078970Brazil

After industrial mango processing,tons of residues such as peels and kernels are discarded as ***,almost 60% of the mango kernel is due to starch on a dry weight ***,starch from mango(Manguifera Indica L.)kernel was applied to obtain a starch fatty ester with vinyl laurate,in DMSo,under basic ***,1H and 13C NMR confirmed that a starch ester with a degree of modification of 2.6 was *** showed that the modified starch has higher thermal stability than its precursors and higher than a vinyl laurate/starch physical *** data showed that granular shape and smooth surface on mango starch changed after chemical modification to a continuous and shapeless *** industrial reject derivative behaved as an efficient alternative environmentally friendly fluid loss controller in oil drilling fluids,even in conditions of high temperatures and high pressures(HtHP)drilling.

关键词： Mango Starch oil drilling fluid transesterification vinyl laurate

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