Consulta: subjectFacets:"Particle size"
Registros recuperados: 38
Data/hora: 06/06/2024 01:21:34

Producción de tomate (Solanum lycopersicum L.) en diferentes granulometrías de "tezontle".
Provedor de dados: 32
Autores: San Martín Hernández, César.
En el mundo moderno, la producción de alimentos demanda tecnologías más eficientes y en armonía con el ambiente. Esta investigación se efectuó con el propósito de evaluar la producción de tomate  en condiciones protegidas e hidroponía, caracterizando previamente las propiedades físicas del sustrato, el cual consistió en mezclar cuatro tamaños de partícula de escoria volcánica roja “tezontle” (Tez) de 3-5, 5-10, 10-20 y 20-30 mm de diámetro con polvo y fibra de coco (PFC) en la proporciones 1:0, 3:1 y 1:1 (Tez:PFC). En contenedores con 24 L de sustrato, se trasplantaron tres plántulas de tomate. Las plantas se regaron con la solución Steiner aplicando solo la fracción de humedad del rango “agua fácilmente disponible”. Mensualmente se monitoreó la...
Palavras-chave: Escoria volcánica roja; Tamaño de partícula; Propiedades físicas; Polvo y fibra de coco; Hidroponía; Red volcanic scoria; Particle size; Physical properties; Dust and fiber coconut; Hydroponics; Maestría; Edafología.
Ano: 2011
URL: http://hdl.handle.net/10521/407

Producción de tomate (Solanum lycopersicum L.) en diferentes granulometrías de "tezontle".
Provedor de dados: 32
Autores: San Martín Hernández, César.
En el mundo moderno, la producción de alimentos demanda tecnologías más eficientes y en armonía con el ambiente. Esta investigación se efectuó con el propósito de evaluar la producción de tomate  en condiciones protegidas e hidroponía, caracterizando previamente las propiedades físicas del sustrato, el cual consistió en mezclar cuatro tamaños de partícula de escoria volcánica roja “tezontle” (Tez) de 3-5, 5-10, 10-20 y 20-30 mm de diámetro con polvo y fibra de coco (PFC) en la proporciones 1:0, 3:1 y 1:1 (Tez:PFC). En contenedores con 24 L de sustrato, se trasplantaron tres plántulas de tomate. Las plantas se regaron con la solución Steiner aplicando solo la fracción de humedad del rango “agua fácilmente disponible”. Mensualmente se monitoreó la...
Palavras-chave: Escoria volcánica roja; Tamaño de partícula; Propiedades físicas; Polvo y fibra de coco; Hidroponía; Red volcanic scoria; Particle size; Physical properties; Dust and fiber coconut; Hydroponics; Maestría; Edafología.
Ano: 2011
URL: http://hdl.handle.net/10521/407

Monitoreo de la retención y absorción de agua en sustratos de diferente granulometría.
Provedor de dados: 32
Autores: Pineda Marín, Luis.
Se evaluó el efecto del tamaño de partícula y frecuencia de riego en los cultivos de lechuga (Lactuca sativa) y jitomate (Solanum esculentum Mill) en semillero mantenidos en un invernadero tipo túnel. Las mezclas de sustratos fueron: fibra de coco-tezontle (Fc-Tz) (75:25 v/v) con dos tamaños de partícula (1-2 y 2-3 mm) y peat moss   (sustrato comercial a granel) como testigo  y las frecuencias de riegos (FR): 1 riego  y dos riegos diarios (1RD y 2RD, respectivamente)  y un riego cada tercer día (1RTD).  Los nueve tratamientos  se analizaron  en un bloques al azar para dos factores con tres repeticiones. Se utilizaron charolas de unicel de 200 cavidades utilizando  30 cavidades por unidad experimental. Al tiempo del trasplante  se evaluó: longitud de raíz...
Palavras-chave: Tamaño de partícula; Mezcla de sustratos; Retención de humedad; Sensores de humedad; Particle size; Substrate mixtures; Moisture retention; Moisture sensors; Maestría; Edafología.
Ano: 2011
URL: http://hdl.handle.net/10521/563

Monitoreo de la retención y absorción de agua en sustratos de diferente granulometría.
Provedor de dados: 32
Autores: Pineda Marín, Luis.
Se evaluó el efecto del tamaño de partícula y frecuencia de riego en los cultivos de lechuga (Lactuca sativa) y jitomate (Solanum esculentum Mill) en semillero mantenidos en un invernadero tipo túnel. Las mezclas de sustratos fueron: fibra de coco-tezontle (Fc-Tz) (75:25 v/v) con dos tamaños de partícula (1-2 y 2-3 mm) y peat moss   (sustrato comercial a granel) como testigo  y las frecuencias de riegos (FR): 1 riego  y dos riegos diarios (1RD y 2RD, respectivamente)  y un riego cada tercer día (1RTD).  Los nueve tratamientos  se analizaron  en un bloques al azar para dos factores con tres repeticiones. Se utilizaron charolas de unicel de 200 cavidades utilizando  30 cavidades por unidad experimental. Al tiempo del trasplante  se evaluó: longitud de raíz...
Palavras-chave: Tamaño de partícula; Mezcla de sustratos; Retención de humedad; Sensores de humedad; Particle size; Substrate mixtures; Moisture retention; Moisture sensors; Maestría; Edafología.
Ano: 2011
URL: http://hdl.handle.net/10521/563

Anais.
Provedor de dados: 14
Autores: SIMPÓSIO SOBRE GRANULOMETRIA DE INGREDIENTES E RAÇÕES PARA SUÍNOS E AVES, 1998, Concórdia.
Granulometria de rações: aspectos fisiológicos; Influência de ingredientes de dietas no desenvolvimento de lesões gástricas em suínos; Granulometria do milho em rações para suínos e aves: digestibilidade de nutrientes e desempenho animal; Granulometria de microcomponentes para rações de suínos e aves; Implicações da granulometria de ingredientes na qualidade de peletes e na economia da produção de rações; Tamanho das partículas de milho moído para rações e como medi-las facilmente através do granulômetro.
Tipo: Documentos (INFOTECA-E)
Palavras-chave: Ave; Ingredientes; Ration.; Granulometria; Ração; Suíno.; Ingredients; Poultry; Particle size; Swine.
Ano: 1998
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/433785

Suspended sediments in a macrotidal estuary: comparison and use of different sensors
Provedor de dados: 5
Autores: Lunven, Michel; Gentien, Patrick.
Measurements made using an in situ particle-sizer (PSA) were compared to those of an optical backscatter sensor (OBS) in a macrotidal estuary. Both estimate the total volume of particles. After comparison with dry weight of suspended matter sampled in the study area, the different measurements were converted into dry weight. In three different kinetic energy regimes, times series were coherent for most of the observations. Discrepancies of suspended sediment concentrations estimated by both sensors appeared under specific hydrodynamic conditions: they were related to occurrences of definite particle populations. Overestimations and underestimations of measurements by the instruments depend on the optical principles of the sensors (backscatter and...
Tipo: Text
Palavras-chave: Particle size; Suspended particulate matter; Aggregates; Taille de particule; Matières en suspension; Agrégats.
Ano: 2000
URL: http://archimer.ifremer.fr/doc/2000/publication-521.pdf

Relations trophiques entre huitre et milieu; influence de la concentration et de la taille des particules
Provedor de dados: 5
Autores: Filia, M; Copello, M; Colomines, J.
At 15 degree C, different concentrations of Phaeodactylum tricornutum are given to Crassostrea gigas . Ingestion, filtration, respiration, ammonia excretion have been measured. All ecophysiological response, except dissolved excretion, are dependent of food concentration. Energy balances have been determined and selectivity of particle size observed.
Tipo: Text
Palavras-chave: Crassostrea gigas; Bivalvia; Phaeodactylum tricornutum; Algae; Diets; Excretion; Respiration; Water filtration; Ingestion; Particle size; Energy balance; Food availability; Ecophysiology; Bilan énergétique; Ecophysiologie; Huître.
Ano: 1983
URL: http://archimer.ifremer.fr/doc/1983/acte-1178.pdf

Alimentation expérimentale de l'huître Crassostrea gigas à l'aide de navicules bleus Haslea ostrearia (Simonsen) de différentes tailles
Provedor de dados: 5
Autores: Barille, Laurent; Bougrier, Serge; Geairon, Philippe; Robert, Jean-michel.
The influence on the feeding physiology (clearance, filtration, ingestion, absorption) of the Japanese oyster Crassostrea gigas of low concentrations of suspended particulate matter (SPM ranging from 2 to 20 mg.l-l) and high food quality (mean organic fraction =54 %) was studied in the laboratory. Experimental diets were made up with three strains of the "blue diatom" Haslea ostrearia, which is responsible of the greening of oyster-ponds. The strains were characterized by different sizes (48, 65 and 98 µm respectively) but possessed the same density and biochemical composition. Clearance rate was found constant at 2.2 1.h(-l).g-l dry weight and therefore was not influenced by increasing seston load. Pseudofaeces production was observed for SPM...
Tipo: Text
Palavras-chave: Taille des particules; Qualité alimentaire; Haslea ostrearia; Crassostrea gigas; Alimentation; Particle size; Food quality; Haslea ostrearia; Crassostrea gigas; Feeding.
Ano: 1994
URL: http://archimer.ifremer.fr/doc/1994/publication-3070.pdf

Influence of suspended mussel lines on sediment erosion and resuspension in Lagune de la Grande Entrée, Îles-de-la-Madeleine, Québec, Canada
Provedor de dados: 5
Autores: Walker, Tony R.; Grant, Jon; Weise, Andrea M.; Mckindsey, Christopher W.; Callier, Myriam D.; Richard, Marion.
Downward fluxes of organically rich biodeposits under suspended mussel lines can cause benthic impacts such as changes in benthic community structure or microbial mat production. Quantifying sediment erosion in these coastal ecosystems is important for understanding how fluxes of organic matter and mussel biodeposits contribute to benthic–pelagic coupling. Critical shear velocity (u*crit), erosion rates and particle size distributions of resuspended sediment were measured at four stations distributed along a transect perpendicular to a mussel farm in Lagune de la Grande Entrée, Îles-de-la-Madeleine (Quebec, Canada). Stations were selected underneath the outer-most mussel line (0 m) and at distances of 15, 30 m and at a reference station (500 m) further...
Tipo: Text
Palavras-chave: Sediment erosion; Shear velocity; Resuspension; Biodeposits; Particle size; Mytilus edulis.
Ano: 2014
URL: http://archimer.ifremer.fr/doc/00202/31287/31925.pdf

Methane Hydrate Formation and Dissociation in Sand Media: Effect of Water Saturation, Gas Flowrate and Particle Size
Provedor de dados: 5
Autores: Benmesbah, Fatima; Ruffine, Livio; Clain, Pascal; Osswald, Véronique; Fandino Torres, Olivia; Fournaison, Laurence; Delahaye, Anthony.
Assessing the influence of key parameters governing the formation of hydrates and determining the capacity of the latter to store gaseous molecules is needed to improve our understanding of the role of natural gas hydrates in the oceanic methane cycle. Such knowledge will also support the development of new industrial processes and technologies such as those related to thermal energy storage. In this study, high-pressure laboratory methane hydrate formation and dissociation experiments were carried out in a sandy matrix at a temperature around 276.65 K. Methane was continuously injected at constant flowrate to allow hydrate formation over the course of the injection step. The influence of water saturation, methane injection flowrate and particle size on...
Tipo: Text
Palavras-chave: Gas hydrate; Porous media; Kinetics; Methane storage estimate; Water saturation; Gas flowrate; Particle size.
Ano: 2020
URL: https://archimer.ifremer.fr/doc/00654/76593/77741.pdf

Surface enhanced Raman scattering optimization of gold nanocylinder arrays: Influence of the localized surface plasmon resonance and excitation wavelength
Provedor de dados: 5
Autores: Guillot, N.; Shen, H.; Fremaux, B.; Peron, Olivier; Rinnert, Emmanuel; Toury, T.; De La Chapelle, M. Lamy.
We here emphasize that the surface enhanced Raman scattering (SERS) intensity has to be optimized by choosing the appropriate gold nanoparticles size for two excitation wavelengths; 632.8 and 785 nm. We discuss the role of the position and of the order of the localized surface plasmon resonance (LSPR) in such optimization for both wavelengths. At 632.8 nm, the best SERS intensity is reached for a LSPR located between the excitation and Raman wavelengths whereas at 785 nm, the LSPR should be placed outside this range. The third order of LSPR is shown to have no influence on the SERS intensity. (C) 2010 American Institute of Physics. [doi:10.1063/1.3462068]
Tipo: Text
Palavras-chave: Gradient index optics; Lenses; Metamaterials; Microwave photonics; Optical design techniques; Optical fabrication; Particle size.
Ano: 2010
URL: http://archimer.ifremer.fr/doc/00011/12240/8970.pdf

Natural invertebrate hosts of iridoviruses (Iridoviridae)
Provedor de dados: 82
Autores: Williams,Trevor.
Invertebrate iridescent viruses (IIVs) are icosahedral DNA viruses that infect invertebrates, mainly insects and terrestrial isopods, in damp and aquatic habitats. Exhaustive searches of databases resulted in the identification of 79 articles reporting 108 invertebrate species naturally infected by confirmed or putative iridoviruses. Of these, 103 (95%) were arthropods and the remainder were molluscs, an annelid worm and a nematode. Nine species were from marine habitats. Of the 99 non-marine species, 49 were from terrestrial habitats and 50 were aquatic, especially the aquatic stages of Diptera (44 species). The abundance of records from species of Aedes,Ochlerotatus and Psorophora contrasts markedly with a paucity of records from species of...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Infection; Natural host; Location; Particle size; Prevalence; Virus characterization data.
Ano: 2008
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1519-566X2008000600001

Interpretation of particle spectra of electronic counters by microscopical methods
Provedor de dados: 27
Autores: Bakker, C.; Prins, T.C.; Tackx, M.L.M.
1. Using monocultures or single species dominated natural phytoplankton, cell counts and volume estimations obtained by visual and electronic methods show reasonable agreement.Calibration seems possible (Figs.1-2).2. Further examples given (Fig. 3-4) show that microscopical identification of the volume peaks in electronic counter spectra of natural seston is not quite simple. Phytoplankton peaks may not be detected in the Counter spectrum. Shifts of Counter peaks to the left side of the visual spectrum may be found when cylindrical, elongated or needle- like phytoplankton dominate the sample.3. Both visual and electronic methods include potentially large errors. Possibly particle volume is either overestimated by the microscope and / or underestimated by...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Detritus; Grazing; Measuring devices; Particle counters; Particle size; Phytoplankton; Zooplankton.
Ano: 1985
URL: http://www.vliz.be/nl/open-marien-archief?module=ref&refid=3195

Determination of methanesulfonic acid and non-sea-salt sulfate in single marine aerosol particles
Provedor de dados: 27
Autores: Kolaitis, L.N.; Bruynseels, F.; Van Grieken, R.; Andreae, M.O.
In open ocean waters the predominant volatile sulfur compound is dimethyl sulfide (DMS), representing almost 90% of the marine sulfur emissions. Methanesulfonic acid (MSA), one of the oxidation products of DMS, is consequently an important constituent of marine aerosols. Laser microprobe mass analysis (LAMMA) has been used for single-particle analysis of particles collected in the marine boundary layer. MSA, like the non-sea-salt sulfate, is mainly associated with the smallest aerosol particles, whose LAMMA spectra match the reference fingerprint spectra of MSA salts, sodium methanesulfonate and ammonium methanesulfonate. The presence of nitrate and heavy metal ions in the LAMMA spectra can reveal, to a certain extent, the degree of air pollution at the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Aerosols; Air pollution; Boundary layers; Heavy metals; Marine environment; Nitrates; Particle size; Sulphates.
Ano: 1989
URL: http://www.vliz.be/nl/open-marien-archief?module=ref&refid=3177

Effect of the calcium level and limestone particle size on the performance of semi-heavy layers in the second cycle of egg production
Provedor de dados: 89
Autores: Pizzolante,CC; Garcia,EA; Laganá,C; Saldanha,ESPB; Deodato,AP; Faitarone,ABG; Scherer,MR; Batista,L.
An experiment was carried out at the Research and Development Unit of Brotas aiming at evaluating dietary calcium level and limestone particle size on the production performance of commercial (Hy-Line Brown) layers in the second lay cycle. Experiment duration was 112 days. A total number of 288 hens, with 83 weeks of age in the beginning of the experiment, were used in a completely randomized experimental design in a factorial arrangement of 2x3, with two calcium levels (3.5 and 4.0%) and three limestone particle size compositions: 100% fine limestone (FL), 30% coarse limestone (CL) + 70% fine limestone (FL), and 50% (CL) + 50% (FL), with six replicates of eight birds each. Egg weight (g), egg production (%), egg mass (%), feed intake (g), feed conversion...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Calcium; Laying hens; Limestone; Particle size; Performance.
Ano: 2006
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-635X2006000300006

Limestone and oyster shell for brown layers in their second egg production cycle
Provedor de dados: 89
Autores: Pizzolante,CC; Kakimoto,SK; Saldanha,ESPB; Laganá,C; Souza,HBA; Moraes,JE.
This study aimed at evaluating the effect of dietary calcium levels and the replacement of calcium sources with different particle size compositions on the performance and egg quality of brown layers in their second egg production cycle. A randomized block experimental design was applied with 12 treatments in a 3x4 factorial arrangement: three calcium levels (2.6, 3.2, 3.8 %) and four combinations of calcium sources (1- 100% fine limestone (FL), 2- 50% FL + 50% coarse limestone (CL), 3- 50% FL and 50% oyster shell (OS), 4- 50% FL and 25% CL+ 25 %OS), with six replicates of eight birds each. Calcium sources were analyzed for geometric mean diameter (GMD) and in-vitro solubility. The following performance and egg quality parameters were evaluated: egg weight...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Egg quality; Levels; Minerals; Particle size; Performance; Sources.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-635X2011000200004

Corn texture and particle size in broiler diets
Provedor de dados: 89
Autores: Benedetti,MP; Sartori,JR; Carvalho,FB; Pereira,LA; Fascina,VB; Stradiotti,AC; Pezzato,AC; Costa,C; Ferreira,JG.
The objective of this study was to evaluate the effect of corn texture and the particle size on broiler performance, carcass yield, nutrient digestibility, and digestive organ morphometrics. In Experiment I, 720 male Cobb chicks were distributed in a completely randomized experimental design with a 2 x 3 factorial arrangement, consisting two corn textures (dented and hard) and three corn particle sizes, was applied, with four replicates of 30 birds each. Corn particle size was classified according to geometric mean diameter (GMD) as fine - 0.46 mm; medium - 0.73 mm, and coarse - 0.87 mm. In Experiment II, 120 broiler chicks were used to evaluate corn digestibility during the periods of 16 to 22 days and 35 to 41 days of age, using the method of total...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Carcass traits; Digestibility; GMD; Particle size; Performance.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-635X2011000400002

Effectiveness of fused magnesium potassium phosphate for marandu grass
Provedor de dados: 90
Autores: Orioli Júnior,Valdeci; Coutinho,Edson Luiz Mendes.
The current high price of KCl and great dependence on importation to satisfy the Brazilian demand indicate the need for studies that evaluate the efficiency of other K sources, particularly those based on domestic raw material. For this purpose, a greenhouse experiment was conducted with samples of a sandy clay loam Typic Haplustox, in a completely randomized 4 x 3 x 2 factorial design: four K rates (0, 60, 120, and 180 mg kg-1), three sources (potassium chloride (KCl), fused magnesium potassium phosphate (FMPP) and a mixture of 70 % FMPP + 30 % KCl) and two particle sizes (100 and 60 mesh), with three replications. Potassium fertilization resulted in significant increases in shoot dry matter production and in K concentrations, both in soil and plants. The...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Brachiaria brizantha; Particle size; Critical level.
Ano: 2009
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832009000600034

Sediment Morphology, Distribution, and Recent Transport Dynamics in a Reforested Fragment
Provedor de dados: 90
Autores: Bovi,Renata Cristina; Silva,Laura Fernanda Simões da; Zenero,Mariana Delgado Oliveira; Carvalho,Camila Carolina de; Cooper,Miguel.
Abstract Erosion generates large amounts of sediment, which may be deposited at the site of origin, on the slope of a hill, or along waterways. The transportability of each type of sediment by runoff and its potential for subsequent deposition largely depends on its morphological features and particle size distribution. The aim of this study is to describe and characterize the morphology and micromorphology of sediments deposited in a reforested area and to understand the dynamics of the transport process. In order to understand the sedimentation processes, the following analyses were performed: particle size distribution, with and without the use of a dispersant solution; statistical analysis of the sand fraction using Folk and Ward parameters; sediment...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Soil erosion; Sedimentation; Particle size; Silting.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832017000100526

Water retention and availability in soils of the State of Santa Catarina-Brazil: effect of textural classes, soil classes and lithology
Provedor de dados: 90
Autores: Costa,André da; Albuquerque,Jackson Adriano; Costa,Adriano da; Pértile,Patricia; Silva,Franciani Rodrigues da.
The retention and availability of water in the soil vary according to the soil characteristics and determine plant growth. Thus, the aim of this study was to evaluate water retention and availability in the soils of the State of Santa Catarina, Brazil, according to the textural class, soil class and lithology. The surface and subsurface horizons of 44 profiles were sampled in different regions of the State and different cover crops to determine field capacity, permanent wilting point, available water content, particle size, and organic matter content. Water retention and availability between the horizons were compared in a mixed model, considering the textural classes, the soil classes and lithology as fixed factors and profiles as random factors. It may...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Field capacity; Permanent wilting point; Available water capacity; Particle size; Mixed models.
Ano: 2013
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832013000600010

In situ estimation of indigestible compounds contents in cattle feed and feces using bags made from different textiles
Provedor de dados: 96
Autores: Valente,Tiago Neves Pereira; Detmann,Edenio; Valadares Filho,Sebastião de Campos; Cunha,Maura da; Queiroz,Augusto César de; Sampaio,Cláudia Batista.
The objective of this experiment was to evaluate estimates of concentration of indigestible dry matter (iDM), indigestible neutral detergent fiber (iNDF) and indigestible acid detergent fiber (iADF) in samples of cattle feed and feces processed at different particle sizes (1-, 2-, and 3-mm) using bags made from nylon (50 μm), F57 (Ankom®), and non-woven textile (NWT - 100 g/m²) in a in situ evaluation procedure. Eight samples of concentrates, seven samples of forages and two samples of cattle feces were used. The samples were put in the bags according to a ratio of 20 mg of dry matter/cm² of surface by using three bags of each textile for each size of particle, totaling 405 bags, which were submitted to ruminal incubation for 264 hours. The contents of...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: F57; Internal markers; Nylon; Non-woven textile; Particle size.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982011000300027

Computer simulation of a Rietema-family hydrocyclone used in irrigated agriculture1
Provedor de dados: 124
Autores: Tonin,Paulo César; Dantas Neto,José; Santos,José Airton Azevedo dos.
The hydrocyclone is a centrifugal separator that has been used for over 50 years in the chemical processing and mining industries. In irrigated agriculture in Brazil it is not used as often. One reason for this is the poor understanding by designers of the complex phenomena involved in the internal flow of the hydrocyclone, and the lack of knowledge of new computational tools available on the market. This study evaluates the use of Computational Fluid Dynamics (CFD) as a potential tool to be used in the design and optimisation of hydrocyclones used in irrigated agriculture. A 50 mm Rietema-family hydrocyclone is simulated using CFD. The turbulent flow inside the hydrocyclone is modelled using the Reynolds Stress Model, and a Eulerian approach is employed...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Pre-filtering; Computational fluid dynamics; Multiphase flow; Particle size.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1806-66902015000100038

Analysis of defects in coffee beans compared to biplots for simultaneous tables
Provedor de dados: 124
Autores: Brighenti,Carla Regina Guimarães; Cirillo,Marcelo Angelo.
ABSTRACT  The demand for high quality coffee has become a consolidated criterion to achieve the best prices. Currently, cooperatives evaluate the coffee beans mainly through the particle size and the number of defects in the sample. This evaluation type generates counting data that originates contingency tables from different periods or groups involving the same variables in the row and column and there may be interest in knowing if two tables are related and how much are related. These are the so-called combined tables. Statistical analysis techniques normally employed do not include categorical data in the combined tables. The aim of this study was to evaluate the incidence of different types of defects in samples of large flat coffee beans in two...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Coffea arabica L.; Coffee quality; Particle size; SVD; Sieves.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1806-66902018000100062

ผลของความชื้นและขนาดอนุภาคของข้าวโพดบดที่มีต่อคุณลักษณะบางประการของผลิตภัณฑ์ที่ได้จากเครื่องเอ็กซ์ทรูดเดอร์แบบสกรูคู่
Provedor de dados: 106
Autores: Pracha Boonyasirikool; Maradee Phongpipatpong; Chulaluck Charunuch; Tavisa Lohana; Vayooha Sontes.
corotating twin screw extruder was used together with response surface rnethodology to study the effect of feed moisture content and particle size on the characteristics of corn extrudates.The operating conditions were fixed at screw speed 250 rpm, banel temperature 140'C, fecd rate 16 kg/hr. The independent variables were selected at 4 levels (13.62,15.16, 16.66 and lg.llo/o wb) for feed moisture contents and at 5levels (0.18,0.38,0.84, 1.01, 1.35 mm.) for parriclc sizc. Response variables were expansion ratio, bulk density. breaking force, water absorption index and water solubility index. Regression analysis showed that change in all responses for corn extrudates were promoted by feed moisture content rather than partide size of feed. The seconcl ordcr...
Tipo: PhysicalObject
Palavras-chave: Corn extrudates produced; Characteristics; Particle size; Extruder; Moisture content; อาหารขบเคี้ยว; ผลิตภัณฑ์อาหารเช้า; ข้าวโพดบด; ขนาดอนุภาค; ความชื้น; เครื่องเอ็กซ์ทรูดเดอร์แบบสกรูคู่; วัตถุดิบ; คุณภาพผลิตภัณฑ์.
Ano: 2012
URL: http://anchan.lib.ku.ac.th/agnet/handle/001/5125

Assessment of physical and physicochemical quality of main chocolates traded in Peru
Provedor de dados: 109
Autores: Chire-Fajardo,Gabriela Cristina; Valdivia-Arrunategui,Rocío Alicia; Orihuela-Rivera,Carmen Adela; Ureña- Peralta,Milber Oswaldo.
Abstract: The quality of the main chocolates marketed in Peru was determined. The physical aspect: color (C *, H *, IB), hardness and particle size, as well as physicochemical: water activity (aw), moisture, fat and ash, correlating with the declaration of ingredients presented in the packaging. We evaluated 30 experimental units of chocolates (imported, domestic, dark chocolate and milk) by experimental methods, randomly acquired from different establishments. The difference between color and hardness by origin was attributed to the dairy component. Dark chocolate had lower values of color components (8.75 ± 0.94 C *, 7.60 ± 4.71 H * and 28.46 ± 0.86 IB) than milk constituents (15.04 ± 2.78 C, 34.59 ± 7.46 H * and 34.55 ± 2.87 IB) and in hardness values...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Ash; Color; Fat; Moisture; Particle size; Texture; Water activity.
Ano: 2017
URL: http://www.scielo.org.co/scielo.php?script=sci_arttext&pid=S0120-28122017000200164

Kinetic modeling of water sorption by roasted and ground coffee
Provedor de dados: 1
Autores: Baptestini, Fernanda Machado; Corrêa, Paulo Cesar; Oliveira, Gabriel Henrique Horta de; Cecon, Paulo Roberto; Soares, Nilda de Fátima Ferreira.
The objective of this study was to model the kinetics of water sorption in roasted and ground coffee. Crude Arabica coffee beans with an initial moisture content of 0.1234 kgwkgdm-1 were used. These beans were roasted to a medium roast level (SCCA # 55) and ground at three particle sizes: coarse (1.19 mm), medium (0.84 mm) and fine (0.59 mm). To obtain the water sorption isotherms and the isosteric heat, different conditions of temperature and relative humidity were analyzed using the dynamic method at 25ºC (0.50, 0.60, 0.70, and 0.80 of RH) and 30°C (0.30, 0.40, 0.50, 0.60, 0.70, and 0.80 of RH) and using the static method at 25ºC (0.332 and 0.438 of RH). The GAB model best represented the hygroscopic equilibrium of roasted coffee at every particle size....
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Particle size; Specific surface; Isosteric heat.
Ano: 2017
URL: http://periodicos.uem.br/ojs/index.php/ActaSciAgron/article/view/32576

Small crumbled diet versus powdered diet in restricted feeding management of juvenile Nile tilapia - doi: 10.4025/actascianimsci.v35i2.16767
Provedor de dados: 2
Autores: Lima, Francisco Roberto dos Santos; Universidade Federal do Ceará; Akao, Michael Masaki Freitas; Universidade Federal do Ceará; Oliveira-Segundo, José Nacélio; Universidade Federal do Ceará; Sá, Marcelo Vinícius do Carmo e; Universidade Federal do Ceará.
The pellet size of the diet can affect both fish growth performance and the water quality of the rearing units. The present work assessed the effects of feeding juvenile Nile tilapia, Oreochromis niloticus (L.) a small crumbled diet (SCD; 0.8  mm) on water quality and growth performance. Fish were reared for six weeks in twenty 250-L polyethylene outdoor tanks at a density of 10 juveniles tank-1 (40 fish m-3). There were two feeding rates (standard and restricted) and two types of artificial fish diet (powdered and SCD). The standard feeding rates were reduced by 30% for restricted feeding. The concentrations of free CO2, reactive phosphorus, total ammonia nitrogen (TAN) and nitrite were higher in the full-fed tanks relative to the restricted-fed tanks. In...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Unpelleted diet; Crumble; Particle size; Restricted feeding; Water quality; Oreochromis niloticus Unpelleted diet; Crumble; Particle size; Restricted feeding; Water quality; Oreochromis niloticus.
Ano: 2012
URL: http://periodicos.uem.br/ojs/index.php/ActaSciAnimSci/article/view/16767

Corn grain processing improves chemical composition and fermentative profile of rehydrated silage
Provedor de dados: 2
Autores: Silva, Marlon Richard Hilário da; Jobim, Clóves Cabreira; Neumann, Mikael; Osmari, Milene Puntel.
This study evaluated the effects of the rehydration and ensiling of corn grain with two geometric mean diameters (GMD) of 0.55 and 1.83 mm obtained by the diameter of the sieved used on the fermentation characteristics and chemical composition of the silage. The experimental design was completely randomized with two treatments and six replications, as follows: rehydrated fine-corn grain silage (RFS) and rehydrated coarse-corn grain silage (RCS). Ground corn was rehydrated with water to achieve moisture levels close to 350 g kg-1. There was no effect on the dry matter recovery, though the recovery rate was high, with values greater than 97% in both silages. The particle size influenced the fiber content, with lower values in the RFS. The acetic and lactic...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Organic acids; Particle size; Processing grain; Storage losses.
Ano: 2018
URL: http://periodicos.uem.br/ojs/index.php/ActaSciAnimSci/article/view/42564

Performance Evaluation of a Locally Fabricated Hammer Mill
Provedor de dados: 111
Autores: Mugabi, Robert; Byaruhanga, Yusuf B; Eskridge, Kent M; Weller, Curtis L.
The performance of a hammer mill fabricated in Uganda was evaluated and the optimal performance conditions were determined. The evaluation was done with screen hole diameters (S) of  1.5, 2.0, and 3.0 mm, hammer tip speeds (H) of 68.12, 81.81, 102.17 m s-1 and hammer thicknesses (T) of 4.0, 5.0, and 6.0 mm for determination of energy consumption and final particle size (GMD) using a modified central composite (CCD) split-plot experimental design. Screen hole diameter and hammer thickness had significant effects on energy consumption (p&lt;0.05). S and H had a significant effect on GMD but with T did not have a significant effect on GMD. S and H had significant effects on both GMD and energy consumption. Quadratic effect of T, interaction effects of TH and...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Hammer mill; Impact energy; Particle size; Split-plot design.
Ano: 2019
URL: http://www.cigrjournal.org/index.php/Ejounral/article/view/5257

Effect of physical properties on the specific heat preserved ground sheanut kernel (BUTYROSPERNUMPARADOXUM)
Provedor de dados: 111
Autores: H.U., Nwannewuihe; M. C., Onwukwe; J.C., Edeh; N. I., Nwagugu; J.N., Nwakaire.
Most agricultural materials undergo various forms of preservation in order to enhance shelf life. Sheanut is usually preserved by heating the kernels over fire in a pot for a time period. This affects its properties especially during heat processing. It is expected that this work will provide information that would help optimize such processing. Preserved sheanut kernel samples sourced locally were prepared by manually cleaning, sorting, grinding and sieving to obtain desired particle sizes. The specific heat of the samples were evaluated as a function of particle size (2.36 mm), (1.18 mm and 1.00 mm), moisture content (initial moisture content, 10%, 20%, 30% and 40% db) and temperature (50oC, 60oC, 70oC, 80oC, and 90oC). The specific heat of each particle...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Power system Engineering specific heat; Particle size; Moisture content; Temperature; Sheanut.
Ano: 2016
URL: http://www.cigrjournal.org/index.php/Ejounral/article/view/3800

Influence of the grinding method on the flow properties of barley
Provedor de dados: 111
Autores: Hoffmann, Thomas.
Hammer mills or roller mills are used to grind grain for feed for animal husbandry. The grinding process in hammer mills is based on impact stress on the grain kernels. Roller mills, however, apply pressure and shear stress. The different working principles in hammer mills and roller mills lead to different physical properties of the ground material. The aim of the project was to quantify the physical properties of barley which was ground by a hammer mill or a roller mill. Therefore, the particle size distributions of the ground material were determined by sieving. The particle form was characterized by a form factor. Shear experiments according to Jenike were carried out to determine the flowability. The bulk density was obtained from the quotient of the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Flow properties; Particle size; Hammer mill; Roller mill.
Ano: 2015
URL: http://www.cigrjournal.org/index.php/Ejounral/article/view/3449

Radiopharmaceuticals for sentinel node detection
Provedor de dados: 52
Autores: Frier,Malcolm.
Imaging of sentinel nodes is a valuable technique in the management of some types of cancer. Several different radiopharmaceuticals have been successfully employed in the technique, but there have been few systematic studies to examine the relationship between physicochemical properties of the radiopharmaceuticals used and in-vivo performance. The present study describes the preparation and characterisation of radiocolloids of similar chemical composition but differing in particle size distribution in an attempt to identify the role of variations in the single parameter of size.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Sentinel node; Radiocolloid; Particle size.
Ano: 2002
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132002000500011

Determination of metabolizable energy value of corn with different average geometric diameters for european quails (Coturnix coturnix coturnix)
Provedor de dados: 52
Autores: Rezende,Marcelo José de Mello; Torres,Alessandro Figueiredo; Murata,Luci Sayori; Garcia,José Américo Soares; McManus,Concepta Margaret.
Metabolizable energy (ME) of corn with different geometric diameters was determined in European quail with 26 days of age with 124 g of mean live weight, using the Total Collection of Excreta Method. One hundred and twenty five quails were divided in five treatments, five replications with five quails each, with one treatment used to determine endogenous losses. Values of Average Geometric Diameter (AGD) of the corn were 600, 800, 1000 and 1200 µm. ME of corn was not affected by AGD. Average values were 3079, 3274, 3300, 3137 Kcal/kg respectively for apparent metabolizable energy, corrected apparent metabolizable energy, true metabolizable energy, corrected true metabolizable energy.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Metabolizable apparent energy; Metabolizable true energy; Particle size; Total collections of excreta.
Ano: 2009
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132009000400022

Lipid core nanoparticles resembling low-density lipoprotein and regression of atherosclerotic lesions: effects of particle size
Provedor de dados: 56
Autores: Freitas,S.C.M.P.; Tavares,E.R.; Silva,B.M.O.; Meneghini,B.C.; Kalil-Filho,R.; Maranhão,R.C.
Particles are usually polydispersed and size is an important feature for lipid-based drug delivery systems in order to optimize cell-particle interactions as to pharmacologic action and toxicity. Lipid nanoparticles (LDE) with composition similar to that of low-density lipoprotein carrying paclitaxel were shown to markedly reduce atherosclerosis lesions induced in rabbits by cholesterol feeding. The aim of this study was to test whether two LDE fractions, one with small (20–60 nm) and the other with large (60–100 nm) particles, had different actions on the atherosclerotic lesions. The two LDE-paclitaxel fractions, prepared by microfluidization, were separated by density gradient ultracentrifugation and injected (4 mg/body weight, intravenously once a week)...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Solid lipid nanoparticles; Drug targeting; Paclitaxel; Atherosclerosis; Particle size.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X2018000300612

Freeze-drying of ampicillin solid lipid nanoparticles using mannitol as cryoprotectant
Provedor de dados: 60
Autores: Alihosseini,Faezeh; Ghaffari,Solmaz; Dabirsiaghi,Ali Reza; Haghighat,Setareh.
abstract Solid lipid nanoparticles (SLNs) are interesting colloidal drug-delivery systems, since they have all the advantages of the lipid and polymeric nanoparticles. Freeze-drying is a widely used process for improving the stability of SLNs. Cryoprotectants have been used to decrease SLN aggregations during freeze-drying. In this study Ampicillin was chosen to be loaded in a cholesterol carrier with nano size range. To support the stability of SLNs, freeze-drying was done using mannitol. Particle size, drug release profile and antibacterial effects were studied after freeze-drying in comparison with primary SLNs. Preparations with 5% mannitol showed the least particle size enlargement. The average particle size was 150 and 187 nm before and after...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Solid lipid nanoparticles; Stability; Cryoprotectant; Freeze-drying; Antibacterial efficacy; Particle size.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1984-82502015000400797

Chemical and physical characterization of Opuntia spp. seeds grown in Hidalgo State, Mexico
Provedor de dados: 118
Autores: Prieto-García,Francisco; Prieto Méndez,Judith; Acevedo Sandoval,Otilio A; Canales Flores,Roberto A; Marmolejo Santillán,Yolanda.
Nopal fruits (Opuntia spp.) represent a valuable food in various Latin America countries. Typically, the seeds are discarded. However, they could contain basic components that might enable their use as a nutritional supplement or as another product convenient for the food industry. The objective of this paper was to perform a physical and chemical characterization of the seeds of three species of Opuntia (O. Heliabravoana, O. Xoconostle, and O. ficus-indica) to provide data that will help determine their potential use. Fruits were collected in different municipalities of Hidalgo State, Mexico; its seeds were extracted, dried, and analyzed. The results reveal that, except for small differences, the seeds had similarity in the physical characteristics of...
Tipo: Journal article
Palavras-chave: Cactaceae; Electron microscope; Heavy metals; Particle size; Prickly pear; Proximal analysis.
Ano: 2016
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-16202016000100013

Micronization and extrusion processing on the physicochemical properties of dietary fiber
Provedor de dados: 65
Autores: Bender,Ana Betine Beutinger; Goulart,Fernanda Rodrigues; Silva,Leila Picolli da; Penna,Neidi Garcia.
ABSTRACT:  Dietary fiber plays an important physiological role, which is directly linked to its physicochemical properties, water-holding, oil-binding, and cation-exchange capacities. These properties can be altered by employing enzymatic, mechanical, and physical processes. Enzymatic and chemical processes require solvents and special conditions that make it unfeasible to use. Thus, the use of physical methods, such as micronization and extrusion, make promising options to change the physicochemical properties of dietary fiber. In this way, this review aimed to approach relevant information about the use of physical processes, specifically micronization and extrusion, for this purpose. Furthermore, conceptual aspects, such as definition, classification,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Grinding; Hydration properties; Mechanical shearing; Particle size; Soluble dietary fiber.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-84782019000700654

Passage kinetics of digesta in horses fed with coastcross hay ground to different degrees
Provedor de dados: 64
Autores: Silva,Vinicius Pimentel; Almeida,Fernando Queiroz de; Pimentel,Róbson Ricardo Moreira; Godoi,Fernanda Nascimento de; Santos,Tiago Marques dos; Pires,Marcus Sandes.
This study was conducted to evaluate the kinetics, physicochemical characteristics and particle size of digesta in the right ventral colon (RVC) of horses fed coastcross hay ground to different degrees. Four horses fitted with cannulae in the RVC were used and were fed the following forms of hay: long, chopped, ground to 5 mm and ground to 3 mm. A Latin Square 4x4 study design was used. Each experimental period included 10 days for diet adaptation, four days for feces collection and one day for digesta collection. The kinetics of the particulate and solute phases of digesta were evaluated based on the mean retention time (MRT), passage rate (k) and transit time (TT) using two external markers: Cr-NDF and Co-EDTA. The TT of solid phase digesta was 3 hours...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Chromium; Digestion; Particle size; Passage rate.
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1413-70542014000500010