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Soil properties characterization for land-use planning and soil management in watersheds under family farming

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International Soil and Water Conservation Research 2022年第1期10卷 119-128页

作者： Jose Miguel Reichert Paulo Ivonir Gubiani Danilo Rheinheimer dos Santos Dalvan Jose Reinert Celso Aita Sandro Jose Giacomini Soils department Universidade Federal de Santa Maria(UFSM)Santa MariaRSBrazil

Environmental monitoring of small,rural watersheds was one of the components of the Natural Re-sources Management and Rural Poverty Alleviation Program(RS-Rural)in southern *** purpose of the monitoring was to assess the impact of promoting soil conservation and environment manage-ment practices adopted by farmers and funded by the *** four small monitored watersheds,in a total of 95 plots representing distinct land use and soil management,surface soil was collected to characterize ground-zero of the Program by determining several soil physical,chemical and microbio-logical *** component analysis(PCA)shows soil physical,chemical and biological properties were decisive in defining the agricultural soils in the rural watersheds with family *** sensitivity to chemical properties provides an opportunity to improve soil quality if soil management focuses on altering those *** management practiced by tobacco farmers leads to rapid,intense degradation of some natural soil properties,especially those related to the dynamics of soil organic matter,compared with more conservationist uses(forest,regrowth,and grassland).Thus,soil management must be reoriented to avoid the progress of degradation and recover soil physical and biological *** crops and by land-abandonment to allow natural vegetation are important management strategies for the degraded soils used for tobacco production,increasing soil organic matter,nutrients and microbial activity and thus allowing further crop *** conclusion,wa-tersheds with tobacco cropping have soils with lower quality than when under no-tillage grain pro-duction,requiring changes in land use and soil management.

关键词： Natural resources management Environmental monitoring Soil conservation Soil quality Alleviating poverty

Antioxidant effects of Phyllanthus niruri tea on healthy subjects

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Asian Pacific Journal of Tropical Medicine 2014年第2期7卷 113-118页

作者： Elisngela Colpo Carlos D.D.A.Vilanova Romaiana P.Pereira Luis Gustavo B.Reetz Liline Oliveira Iria L.G.Farias Aline A.Boligon Margareth L.Athayde Joo Batista T.Rocha departamento de Química Centro de Ciências Naturais e ExatasUniversidade Federal de Santa Maria(UFSM) Laboratrio de Anlises Clínicas Hospital UniversitrioUniversidade Federal de Santa Maria(UFSM) departamento de Farmcia Industrial Universidade Federal de Santa Maria(UFSM)

Objective:To investigate the potential antioxidant effects of Phyllanthus niruri(***)tea on healthy ***:Five non-smoking,male healthy volunteers,20 to 31 years *** *** subject was treated twice,following a randomized crossover fashion regarding the ingestion of *** infusion(5 g/750 mL)(tea group)or 750 mL of water(control group).Fasting venous blood samples were collected prior to and at 1.2 and 4 h after infusion *** were tested for plasmatic gallic acid and ascorbic acid levels,erythrocytic catalase and superoxide dismutase activities,and intracellular DCFH fluorescence in granulocytes,monocytes and ***:Catalase and superoxide dismutase activities were not altered by tea *** levels of gallic acid were significantly increased at1,2 and 4 h after *** ingestion and plasma ascorbic acid at 1 h after *** ***:Ingestion of *** tea is associated with a slight increase in antioxidant markers in human blood(ascorbic acid and gallic acid),which may contribute to its pharmacological effects.

关键词： Antioxidants Polyphenols Phyllanthus niruri Human Ascorbic acid Gallic acid

Unsuitable use of spin and pseudospin symmetries with a pseudoscalar Cornell potential

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Chinese Physics B 2014年第9期23卷 60-61页

作者： L.B.Castro A.S.de Castro departamento de Física CFM Universidade Federal de Santa Catarina departamento de Física Universidade Federal do Maranho Campus Universtitrio do Bacanga departamento de Física e Química Campus de Guaratinguet Universidade Estadual Paulista

The concepts of spin and pseudospin symmetries has been used as mere rhetorics to decorate the pseudoscalar potential [Chin. Phys. B 22 090301 （2013）]. It is also pointed out that a more complete analysis of the bou... 详细信息

关键词： Dirac equation pseudoscalar Comell potential spin symmetry pseudospin symmetry

Effect of mini-cutting size on adventitious rooting and morphophysiological quality of Ilex paraguariensis plantlets

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Journal of Forestry Research 2021年第2期32卷 815-822页

作者： Nathalia Pimentel denise Gazzana Janaina de Fatima Spanevello Kelen Haygert Lencina Dilson Antônio Bisognin Programa de Pós-Graduação em Engenharia Florestal Centro de Ciências Rurais da Universidade Federal de Santa MariaAvenida Roraima1000Santa MariaRS 97105-900Brazil Curso de Graduação em Agronomia Centro de Ciências Rurais da Universidade Federal de Santa MariaAvenida Roraima1000Santa MariaRS 97105-900Brazil departamento de Fitotecnia Centro de Ciências RuraisUniversidade Federal de Santa MariaAv.Roraima1000Santa MariaRS 97105-900Brazil

As the energizing and therapeutic effects of infusions of mate(Ilex paraguariensis ***.-Hil)leaves are increasingly recognized,rising global consumption is also increasing the demand for plantlets with high genetic and morphological ***-cuttings are an alternative for clonal plantlets;however,more details are needed on factors that affect the success of this ***,toward maximizing production,we evaluated adventitious rooting competence of mini-cuttings of different sizes and the morphophysiological quality of the resultant ***(one bud;length up to 2.5 cm),medium(multiple buds;length 2.6–5.0 cm),and large(multiple buds;length 5.1–10.0 cm)mini-cuttings were planted in a mixture of commercial substrate,vermiculite,and coarse sand(1:1:1 v:v:v),grown in a humidity chamber,then evaluated after 45,60,75,and 90 days for survival,percentage of callus and shoot formation,number and length of shoots,percentage of rooted cuttings,and number and length of *** rooted mini-cuttings were then cultivated in commercial substrate and subsurface soil(2:1 v:v)and evaluated after 30,60,90 and 120 days of cultivation for morphophysiology of the plantlets,percentage of survival,number of leaves,shoot height,stem diameter,and ratio of shoot height to stem *** 120 days,the plantlets were evaluated for the ratio of shoot and root dry mass,total length,surface area,total volume,and mean diameter of roots and Dickson quality *** rooting of the mini-cuttings and the morphophysiological quality of the plantlets were not influenced by the size of the vegetative ***,single-bud mini-cuttings have similar adventitious rooting competence,and result in plantlets with adequate morphophysiological quality,based upon leaf development,shoot height,stem diameter and length,and surface area,volume and diameter of ***-bud mini-cuttings up to 2.5 cm long can thus be used to maximize production of mate plantlets by mini-c

关键词： Aquifoliaceae Clonal forestry Mini-cutting technique Plantlet production Vegetative propagation

dewetting in associating lattice gas model confined by hydrophobic walls

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Science China(Physics,Mechanics & Astronomy) 2019年第10期62卷 60-67页

作者： Tassylla OFonseca Marcia M.Szortyka Patricia Temes Cristina Gavazzoni Alan Bde Oliveira Marcia CBarbosa Instituto de Fsica Universidade Federal do Rio Grande do SulPorto Alegre 91501-970Brasil universidade federal de santa Catarina Rua Pedro Joao PereiraMato Alto 88900-000Brasil Instituto federal Catarinense Sao Bento do Sul 89283-064Brasil Instituto de Quimica Universidade Estadual de CampinasCampinas 13083-970Brasil departamento de Fisica Universidade Federal de Ouro PretoOuro Preto 35400-000Brasil

The phase behavior of a two dimensional fluid confined within hydrophobic walls is obtained by Monte Carlo *** fluid is described by the associating lattice gas model which reproduces the density and diffusion anomalous behavior of *** confined fluid exhibits a liquid-liquid critical temperature which decreases with the decrease of the distance between the confining *** contact with the wall a dewetting is *** thickness of this interfacial layer is independent of the distance between the two *** for very small distances between the two walls no total depletion is observed and consequently no drying transition is present.

关键词： water lattice confined

Tribological behaviour of sintered iron based self-lubricating composites

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Friction 2017年第3期5卷 285-307页

作者： Jose Daniel Biasoli de MELLO Cristiano BINdeR Gisele HAMMES Roberto BINdeR Aloisio Nelmo KLEIN Laboratorio de Materiais(LabMat) Universidade Federal de Santa Catarina Florianópolis 88.040-900 SC BrazilLaboratorio de Tribologia e Materiais Universidade Federal de Uberl(a)ndia Uberl(a)ndia 38.400-902 MG Brazil Laboratorio de Materiais(LabMat) Universidade Federal de Santa Catarina Florianópolis 88.040-900 SC Brazil Whirlpool Embraco Unit Joinville 89.219-900 SC Brazil

This work is a review of previous works,presenting and discussing the most important results obtained by an ongoing research program towards the development of innovative,low-cost,self-lubricating composites with a low friction coefficient and high mechanical strength and wear *** emphasis is given to uniaxial die pressing of solid lubricant particles mixed with matrix powders and to metal injection moulding associated with in situ generation of solid lubricant ***,a microstructural model/processing route (powder injection moulding followed by plasma-assisted debinding and sintering) produced a homogeneous dispersion of in situ generated solid lubricant *** nodules of graphite with diameter smaller than 20 μm were formed,constituting a nanostructured stacking of graphite foils with nanometric *** Raman analysis indicated that the graphite nodules were composed of turbostratic 2D graphite having highly misaligned graphene planes separated by large interlamellae *** interplanar distance between the graphene foils and misalignment of these foils were confirmed by transmission electron microscopy and were,probably,the origin of the outstandingly low dry friction coefficient (0.04).The effect of sintering temperature,precursor content,metallic matrix composition and surface finish is also ***,the influence of a double-pressing/double-sintering (DPDS) technique on the tribological performance of self-lubricating uniaxially die-pressed hBN + graphite-Fe-Si-C-Mo composite is also ***,the tribological behaviour of die-pressed Fe-Si-C matrix composites containing 5,7.5 and 10 wt％ solid lubricants (hBN and graphite) added during the mixing step is analysed in terms of mechanical properties and wear ***,the synergy between solid lubricant particles dispersed in a metallic matrix and fluid lubricants in a cooperative mixed lubrication regime is presented.

关键词： tribological behaviour powder metallurgy iron based self-lubricating composites turbostratic graphite

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

DC Plasma Technology Applied to Powder Metallurgy: an Overview

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Plasma Science and Technology 2013年第1期15卷 70-81页

作者： A. N. KLEIN R. P. CARDOSO H. C. PAVANATI C. BINdeR A. M. MALISKA G. HAMMES D. FUSAO A. SEEBER S. F. BRUNATTO J. L. R. MUZART LabMat (Materials Laboratory) Departamento de Engenharia Mec~nica Universidade Federal de Santa Catarina (UFSC) 88040-900 FlorianSpolis - SC Brazil departamento de Engenharia Mecanica Universidade Federal do Parana (UFPR) 81531-990 Curitiba- PR Brazil departamento Academico de Metal-Mecanica Instituto Federal de Santa Catarina (IFSC) 88020-300 Florianopolis - SC Brazil universidade Tecnologica federal do Parana (UTFPR) 84016-210 Ponta Grossa - PR Brazil Centro de Ciencia e Tecnologia Universidade de Caxias do Sul 95070-560 Caxias do Sul- RS Brazil

DC plasma is a very promising technology for processing different materials, and is becoming especially interesting when low environmental impact and high-performance treatments are needed. Some of the intrinsic characteristics of DC plasma technology, which make it suitable for powder metallurgy （PM） and powder injection molding （PIM） parts production, are low- pressure processing and plasma environment high reactivity. Moreover it can be considered as a highly competitive green technology. In this work, an overview of some of the important DC plasma techniques applied to PM and PIM parts processing is presented. Emphasis is given to the descriptions of the main characteristics and the technique potentials of plasma-assisted nitriding, plasma-assisted thermal debinding, plasma-assisted sintering, and simultaneously plasma-assisted sintering and surface alloying. The aspects presented and discussed in this paper indicate that DC plasma processes are promising and competitive techniques for PM and PIM parts processing.

关键词： powder metallurgy DC glow discharge plasma nitriding plasma sintering,plasma-assisted thermal debinding surface alloying

Tribologically induced nanostructural evolution of carbon materials: A new perspective

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Friction 2024年第1期12卷 144-163页

作者： Guilherme Oliveira NEVES Nicolás ARAYA Diego Berti SALVARO Thiago de Souza LAMIM Renan Oss GIACOMELLI Cristiano BINdeR Aloisio Nelmo KLEIN JoséDaniel Biasoli de MELLO Laboratório de Materiais Universidade Federal de Santa CatarinaSanta Catarina 88040-900Brazil departamento de Ingeniería Mecánica Facultad de IngenieríaUniversidad del Bío-BíoConcepcion 4070-386Chile Universidad de Concepción Concepcion 4070-386Chile SENAI Innovation Institute for Laser Processing Santa Catarina 89218-153Brazil universidade federal de Uberlândia Minas Gerais 38408-100Brazil

Carbon-based solid lubricants are excellent options to reduce friction and wear,especially with the carbon capability to adopt different allotropes *** the macroscale,these materials are sheared on the contact along with debris and contaminants to form tribolayers that govern the tribosystem *** a recently developed advanced Raman analysis on the tribolayers,it was possible to quantify the contactinduced defects in the crystalline structure of a wide range of allotropes of carbon-based solid lubricants,from graphite and carbide-derived carbon particles to multi-layer graphene and carbon *** addition,these materials were tested under various dry sliding conditions,with different geometries,topographies,and solid-lubricant application *** of the initial tribosystem conditions and allotrope level of atomic ordering,there is a remarkable trend of increasing the point and line defects density until a specific saturation limit in the same order of magnitude for all the materials tested.

关键词： carbon nanostructures tribology Raman spectroscopy defects quantification tribolayer solid lubrication