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Journal articles on the topic 'Granulometry'

Author: Grafiati
Published: 4 June 2021
Last updated: 7 July 2024

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1

Palumbo, Demian Daniel, Hugo Daniel Bianchetto, Gerardo Botasso, María José Correa, and Enrique Patrón-Costas. "Methodology for the granulometric control of aggregates. Development of limit granulometric curves for quarries, adapted to road requirements." DYNA 90, no. 229 (December 15, 2023): 137–47. http://dx.doi.org/10.15446/dyna.v90n229.109296.

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The absence of specifications for the granulometry a quarry must produce causes a serious problem, making it difficult for quarries to adjust their processes to produce within the range required by clients, and for costumers, making it a difficult process to design asphalt mixes and concretes that conform to the granulometric curves established in regulations. It is essential to develop limit granulometric curves for quarries, adapted to customer requirements. In this paper, a methodology for granulometric control in the quarry is proposed, which includes the collection of process information, the preparation of control charts and the process capability analysis according to the established specifications. Moreover, an example of the development of limit granulometric curves is proposed for the quarry under study located in Argentina, in the province of Buenos Aires, which would allow to produce aggregates whose granulometry can be used in asphalt mixes CAC D19 and concrete pavements.
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2

Yung-Vargas, Y. W., H. A. Rondón-Quintana, and J. E. Córdoba-Maquilón. "Evaluation of recycled asphalt pavement in Colombia." Journal of Physics: Conference Series 2153, no. 1 (January 1, 2022): 012007. http://dx.doi.org/10.1088/1742-6596/2153/1/012007.

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Abstract Reclaimed asphalt pavements are obtained from existing pavements through recovery techniques and are used for new asphalt mixtures production with the inclusion of virgin aggregates and asphalt cement, constituting environmentally friendly mixtures at a lower total cost, by requiring fewer quantities of new materials. This research, unlike the studies found on the subject, focuses on the study of reclaimed asphalt pavement by analyzing its granulometric distribution and asphalt cement content. For this purpose, representative reclaimed asphalt pavement samples were taken from four Colombia cities, to verify their heterogeneity. The obtained reclaimed asphalt pavement was analyzed in the laboratory, to obtain the material granulometric distribution, through extraction and asphalt content tests, following Colombian regulations from the “Instituto Nacional de Vías”. The results show that the granulometry of all cities has a central tendency (average) that moves towards an upper limit in the 2 mm particles. When analyzing the granulometry separately of the four cities, it is observed that they present a different trend in their granulometry, which shows their heterogeneity. The asphalt cement content presented values between 4.0% and 5.0%.
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Simboh, Reyvalentin, Royke M. Rampengan, Hermanto W. K. Manengkey, Rignolda Djamaluddin, Esry T. Opa, and Hengky J. Sinyal. "Sediment Granulometry of the Beach at the Kalasey’s Groynes." Jurnal Ilmiah PLATAX 9, no. 2 (August 7, 2021): 234. http://dx.doi.org/10.35800/jip.9.2.2021.34778.

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Coastal areas have the potential to be developed and utilized for various purposes. However, the intensity of coastal use can result in the degradation of the coastal environment. Therefore, management of the coastal areas is often carried out by building shore protective structures, including groynes. The placement of a structure in the form of a groynes is primarily intended to block littoral flow in moving sediment out of certain places in the shore. Therefore, the placement of groynes on the shore needs to be followed by a study to find out the effectiveness of the groynes. The effectiveness of groynes can be determined, among others, by a study on the granulometry of sediments on the beach. This study was conducted to describe the composition of the sediment and to analyze granulometry distribution in several places at the beach around the groynes on the shore of Kalasey. The study of the physical sediments around the Kalasey groynes was carried out through a study of the sediment samples from October 30, 2020, to April 27, 2021. Sediment sampling was carried out at 6 stations which have been determined on the surface of the beach formed around the groynes. The results obtained through this research showed that the composition of the sediments in the beach around the Kalasey groynes consisted of size classes as follows: very fine sand, fine sand, medium sand, coarse sand, very coarse sand, granule, and pebble. Fine-sized materials at the beach which is located in the groynes on further east have increased in composition. Based on the granulometric analysis of the sediment, it is indicated that the erosion and deposition processes occur alternately in the beaches formed around the groynes.Keywords: Beach; Kalasey Groynes; Sediment Composition; Granulometric AnalysisAbstrakWilayah pantai memiliki potensi untuk dikembangkan dan dimanfaatkan untuk berbagai kepentingan. Walaupun demikian, intensivitas pemanfaatan pantai dapat mengakibatkan terjadinya degradasi lingkungan pantai. Oleh karena itu, dalam rangka pengelolaan pantai seringkali dilakukan dengan cara membangun struktur pelindung pantai, diantaranya berupa groin. Penempatan struktur berupa groin di kawasan pantai, dimaksudkan utamanya untuk menghadang aliran litoral dalam memindahkan sedimen keluar dari tempat tertentu di kawasan pantai. Oleh karena itu, penempatan groin di pantai perlu diikuti dengan kajian untuk melihat efektivitas fungsi groin pada kawasan pantai tersebut. Salah satu cara untuk melihat efektivitas kerja groin di pantai adalah melalui kajian menyangkut granulometri sedimen gisik yang terhampar di sekitar groin yang ditempatkan. Penelitian ini dilakukan dengan tujuan mendeskripsikan komposisi sedimen dan menganalisis distribusi granulometri di beberapa tempat pada gisik sekitar groin di pantai Kalasey. Kajian terhadap sedimen gisik sekitar groin Kalasey dilakukan melalui telaah terhadap sampel sedimen yang dicuplik mulai 30 Oktober 2020 sampai dengan 27 April 2021. Pencuplikan sedimen dilaksanakan di 6 stasiun yang ditetapkan pada permukaan gisik yang terbentuk di sekitar groin Kalasey. Hasil yang diperoleh melalui penelitian ini adalah komposisi sedimen pada gisik di sekitar groin Kalasey terdiri dari kelas ukuran berupa pasir sangat halus, pasir halus, pasir sedang, pasir kasar, pasir sangat kasar, granul, dan kerakal. Gisik yang terletak pada kawasan groin semakin ke arah Timur pada kawasan ini, komposisi sedimennya mengalami peningkatan jumlah material sedimen yang berukuran halus. Berdasarkan analisis granulometri sedimen terindikasi bahwa proses erosi dan deposisi terjadi secara bergantian pada gisik-gisik yang terbentuk di sekitar groin.Kata kunci: Gisik; Groin Kalasey; Komposisi Sedimen; Analisis Granulometri
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4

Carmona, E., J. Ordovás, M. T. Moreno, M. Avilés, M. T. Aguado, and M. C. Ortega. "Granulometric Characterization and Alteration during Composting of Industrial Cork Residue for Use as a Growing Medium." HortScience 38, no. 6 (October 2003): 1242–46. http://dx.doi.org/10.21273/hortsci.38.6.1242.

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This work describes the granulometry of industrial cork residue (bark of Quercus suber L.) and its possible alteration during composting to eliminate the high content of phytotoxic substances. Because of the differences in density of the different-sized cork particles, expression of the granulometric distribution in relation to volume reflected the size distribution more accurately than its expression in relation to weight. As a consequence, predictions of the physical and hydrological behavior of the substrate, deduced from its granulometry, were more accurate when this was calculated in relation to volume. Objective parameters used for textural comparison, such as the geometric mean (dg) and standard deviation of particle size (σg), which were previously used in soils, were tested. These permit the estimation of small differences in the particle size of different lots or the granulometric alteration occurring during composting. With the same purpose, a new diagram of textures for the classification of granular substrates was also studied.
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5

Suriani, Putri Dwi, M. Haris Miftakhul Fajar, Nita Ariyanti, Ayu Putri Ramadhani, Faqih Ulumuddin, Helda Kusuma Rahayu, Mahendra Wirayudhatama, Marsha Khairia Alfany, Muhammad Erfand Dzulfiqar Rafi, and Syabibah Zakiyyah Zukhrufah. "Sediment Deposits Texture Analysis of Besuk Kobokan River in the Northern Slope Semeru Volcano Lumajang." IOP Conference Series: Earth and Environmental Science 1307, no. 1 (February 1, 2024): 012025. http://dx.doi.org/10.1088/1755-1315/1307/1/012025.

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Abstract The flow of volcanic material from Semeru Volcano as one of the most active volcano on Java Island is still flowing and deposited along the Besuk Kobokan River which empties into Bambang Beach, Lumajang. The sediments as volcanic products are transported through the river environment with water as its transport agent. This transportation and deposition process has certain grain texture characteristics that can be identified through granulometry analysis. Geological observations and sediment sampling were carried out at 8 points along the Besuk Kobokan River. Granulometry analysis aims to identify the grain texture distribution of Semeru Volcano sediments that have been transported. The results of granulometric analysis that can identify the distribution of grain texture show that the first point to the fifth point at the sampling location was influenced by lahars flow and pyroclastic flow, resulting in randomness in grain size and rock texture. While the sixth to eighth points show the fluvial sedimentation process.
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6

Robert, Frédérique, and Guy Lefebvre. "Granulometry on Riprap Images." Microscopy Microanalysis Microstructures 7, no. 5-6 (1996): 393–97. http://dx.doi.org/10.1051/mmm:1996137.

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7

Rebouças, Renata Cardia, and Felipe Castro. "MÉTODOS CLÁSSICOS DE SEDIMENTOLOGIA APLICADOS À IDENTIFICAÇÃO DE DEPÓSITOS COSTEIROS COMO FERRAMENTA AO LICENCIAMENTO AMBIENTAL (CLASSICAL METHODS OF SEDIMENTOLOGY APPLIED TO THE IDENTIFICATION OF COASTAL DEPOSITS AS A TOOL TO THE ENVIRONMENTAL LICENSING)." Revista GeoNordeste, no. 1 (July 5, 2019): 180–99. http://dx.doi.org/10.33360/rgn.2318-2695.2019.i1p180-199.

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RESUMO:A classificação de ambientes costeiros pode ser uma tarefa complexa. O estudo da geomorfologia na identificação de ambientes sedimentares necessita de uma validação. Não raro, feições como cordões litorâneos são confundidas com dunas. O depósito sedimentar em forma de dunas fica melhor caracterizado quando realizados estudos sedimentológicos, nos quais são observados os parâmetros granulométricos e a morfoscopia dos grãos. Neste trabalho estes métodos clássicos de sedimentologia foram aplicados aos sedimentos de testemunhos coletados na planície costeira da localidade de Mosqueiro (SE). A análise granulométrica e morfoscópica mostrou que, apesar de os sedimentos possuírem algumas características peculiares às areias de dunas, como uma granulometria fina, assimetria positiva tendendo para os finos e distribuição leptocúrtica da curva gaussiana, os sedimentos apresentam outras características como a seleção moderada e a superfície predominantemente polida que indicam que estes depósitos não foram formados exclusivamente pelo transporte eólico. O transporte misto, ora pela água, ora pelo vento, aponta para um ambiente de cordões litorâneos. Embora estes depósitos não tenham sido considerados dunas, é importante não construir na faixa de variação natural da praia para se evitar problemas com erosão costeira, bem como garantir a conservação ambiental e a segurança das pessoas e do patrimônio.Palavras-chave: Granulometria; Morfoscopia; Dunas; Cordões Litorâneos. ABSTRACT:The classification of coastal environments could be a complex task. The study of geomorphology in the identification of sedimentary environments requires validation. Often, features like beach ridges are confused with dunes. The sedimentary deposit in the form of dunes is better characterized when sedimentological studies are carried out, in which granulometric parameters and grain morphoscopy are observed. In this work, these classical methods of sedimentology were applied to the sediments of the samples collected in the coastal plain of Mosqueiro (SE). The granulometric and morphoscopic analysis showed that, although the sediments have some characteristics peculiar to the sand dunes, such as fine granulometry, positive asymmetry tending to the fines and leptokurtic distribution of the Gaussian curve, the sediments present other characteristics such as moderate selection and surface that indicate that these deposits were not formed exclusively by the wind transport. The mixed transport, sometimes by the water, or by the wind, points to an environment of coastal strings. Although these deposits have not been considered as dunes, it is important not to build on the natural range of the beach to avoid problems with coastal erosion, as well as to guarantee environmental conservation and the safety of people and property.Keywords: Granulometry; Morphoscopy; Dune; Beach Ridges.
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8

Rosères, Charles, Léo Courty, Philippe Gillard, and Christophe Boulnois. "Burning Velocities of Pyrotechnic Compositions: Effects of Composition and Granulometry." Energies 15, no. 11 (May 26, 2022): 3942. http://dx.doi.org/10.3390/en15113942.

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Burning velocities of binary and ternary pyrotechnic compositions are measured in gutter. The study focuses on the determination of the joint influence of several parameters: oxidant/reducer ratio, reducer granulometry, and binder content. Measurements are performed following the standard NF T70-541 for burning velocity estimation using an optical acquisition method. Binder content has a linear influence on the burning velocity with a pivot point in slope at supposed stoichiometry. Changing the granulometric class of metallic reducer shows to have different influences before and beyond a 20% diameter reduction.
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9

Plesiński, Karol. "Wpływ rumoszu drzewnego na granulometrię osadów korytowych." Przegląd Naukowy Inżynieria i Kształtowanie Środowiska 27, no. 1 (April 14, 2018): 42–56. http://dx.doi.org/10.22630/pniks.2018.27.1.5.

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The aim of paper is to investigate the impact of woody debris deposited on the river bed on the granulometry of the bed material. The analysis included upstream and downstream sides of the investigated woody debris. The investigations comprised determination of the geometric dimensions of the analyzed wood deposits, determination of the granulometric composition of the bed material in the area of deposition of woody debris, determination of the range of influence of the investigated woody debris on the bed material and determination of the relationship between the geometric dimensions of the woody debris and the extent of their impact on the bed material. The granulometric analysis was conducted using the conventional sieving method. The extent of the influence of woody debris was determined on the basis of the Nash’s-Sutcliffe’s efficiency coefficient. The dependence of the extent of wood influence and the dimensions of the investigated woody debris was determined on the basis of the Spearman’s correlation coefficient. It was found that the woody debris deposited on the bed of the Raba river affects the granulometry of the bed material on both the upstream and downstream sides. The study also showed that the extent of the impact on the grain-size composition of the bed material on the downstream sides of the woody debris is determined to a large extent by the height of the deposited woody debris.
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Sapsuha, Isman, Royke M. Rampengan, Esry T. Opa, Hermanto K. Manengkey, Wilmy K. Pelle, and Ferdinand F. Tilaar. "KEMIRINGAN LERENG DAN GRANULOMETRI SEDIMEN GISIK TANJUNG MERAH, BITUNG SULAWESI UTARA." JURNAL PESISIR DAN LAUT TROPIS 7, no. 2 (July 17, 2019): 90. http://dx.doi.org/10.35800/jplt.7.2.2019.24197.

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Beach slope and sediment granulometry is one of the importat aspect in coastal management. Beach offers a variety of functions and potential to be utilized. In the interests of phisical use in the beach, coastal structure in the form of groynes has been built. Actually, the groin has been used as a dock. This research was conducted with the aim of revealing the slope and granulometry sediment in Tanjung Merah beach. The results obtained, the beach slope is considered sloping and very sloping, the composition of the sediment consists mainly of medium sand, fine sand and very fine sand. Sediment distribution analysis obtained results, the main grain size was mainly in the form of medium sand, sorting was mainly classified as poor, skewness was mostly asymmetrie strong to large size, most curtosis was mesokurtic. The results of the study indicate the occurrence of the process of erosion and deposition ia certain spaces on the beach studied.Keywords: Tanjung Merah, beach slope, sediment granulometryKemiringan lereng dan granulometri sedimen gisik merupakan salah satu aspek penting dalam pengelolaan pantai. Gisik menawarkan beragam fungsi dan potensi untuk dimanfaatkan. Dalam kepentingan pemanfaatan lahan gisik, berbagai modifikasi dilakukan oleh manusia. Pada gisik di Tanjung Merah, telah dibangun struktur pantai berupa groin. Secara aktual, groin tersebut telah difunsikan sebagai dermaga. Penelitian ini dilakukan dengan tujuan mengungkapkan kemiringan dan granulometri sedimen di gisik Tanjung Merah. Hasil penelitian yang diperoleh, lereng gisik terkriteria miring dan sangat miring, komposisi sedimen terutama terdiri dari pasir sedang, pasir halus, dan pasir sangat halus. Analisis distribusi memperoleh hasil, rataan empirik terutama berupa pasir sedang, penyortiran terutama terklasifikasi buruk, kemencengan terbanyak berupa asimetris kuat ke ukuran besar, peruncingan terbanyak berupa mesokurtik. Hasil studi mengindikasikan terjadi proses erosi dan deposisi pada ruang-ruang tertentu di gisik yang ditelaah.Kata kunci : Tanjung Merah, kemiringan lereng, granulometri sedimen
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Gall, B. Ramounet-Le, P. Fritsch, M. C. Abram, G. Rateau, G. Grillon, K. Guillet, S. Baude, P. Bérard, E. Ansoborlo, and J. Delforge. "Mesure de paramètres spécifiques pour le calcul de dose après inhalation d'aérosols renfermant des éléments transuraniens." Canadian Journal of Physiology and Pharmacology 80, no. 7 (July 1, 2002): 727–32. http://dx.doi.org/10.1139/y02-073.

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A review on specific parameter measurements to calculate doses per unit of incorporation according to recommendations of the International Commission of Radiological Protection has been performed for inhaled actinide oxides. Alpha activity distribution of the particles can be obtained by autoradiography analysis using aerosol sampling filters at the work places. This allows us to characterize granulometric parameters of "pure" actinide oxides, but complementary analysis by scanning electron microscopy is needed for complex aerosols. Dissolution parameters with their standard deviation are obtained after rat inhalation exposure, taking into account both mechanical lung clearance and actinide transfer to the blood estimated from bone retention. In vitro experiments suggest that the slow dissolution rate might decrease as a function of time following exposure. Dose calculation software packages have been developed to take into account granulometry and dissolution parameters as well as specific physiological parameters of exposed individuals. In the case of poorly soluble actinide oxides, granulometry and physiology appear as the main parameters controlling dose value, whereas dissolution only alters dose distribution. Validation of these software packages are in progress.Key words: actinide oxides, dosimetry, inhalation.
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Marquez, Marcio Eduardo, and Fabrício Celso. "ESTUDO DA VIABILIDADE TÉCNICA DO PROCESSAMENTO DE RESÍDUOS DE ESPUMA FLEXÍVEL DE POLIURETANO POR UM MOINHO DE FACAS." Revista Tecnologia e Tendências 11, no. 1 (September 15, 2020): 72. http://dx.doi.org/10.25112/rtt.v11i1.2292.

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ResumoA necessidade de encontrar meios para reciclar materiais que até então eram apenas descartados no meio ambiente traz também a necessidade de conhecermos a viabilidade de alguns processos em meio industrial, avaliando-os não apenas financeira, mas também tecnicamente, por meio do uso de equipamentos de fácil acesso, manuseio e manutenção. Pensando nisso, este trabalho busca aplicar o processo de trituração por moinho de facas a espumas flexíveis de poliuretano, nas quais ainda se percebe carência de estudos em se tratando de sua redução de partículas por meio de processos industriais. Com o uso de um moinho de facas, buscou-se moer aparas da fabricação de assentos sanitários, sendo que a capacidade do processo e a granulometria final do material triturado foram quantitativamente avaliados e o fluxo de material bem como a moagem em si, foram avaliados qualitativamente. Com uma capacidade aproximada de 1 kg/h, uma granulometria apresentando 46,3% das partículas com dimensões de 2,01 a 4,00mm, fluxo e moagem insatisfatórios, este processo, tal como estudado neste trabalho, foi considerado ineficiente na busca de trituração da espuma flexível de poliuretano, mantendo a necessidade de buscar ainda, em meio industrial, solucionar um problema de processo de reciclagem deste material.Palavras-chave: Espuma Flexível de Poliuretano. Moinho de facas. Capacidade. Granulometria. ABSTRACTThe need of to find ways to recycle materials those only were leave on the environment, brings the need in to know the viability of some processes in industrial scale, evaluating them not just financially form but technically to, by the use of commun, and cheaps, and easily maintenece equipements.Therefore, this paper aims to apply the grind process by knife mill to flexible polyurethane foams those don’t has a great variety of studys about their reduction particle size by processes in industrial scale. Using a knife mill, some foam burrs from the toilet seat fabrication were grinded, and the process capability, as much as the material granulometry, were quantitatively measured. The material flow into the knife mill and the grinder process were qualitatively evaluated. With a capability around 1 kg/h and a granulometry with 46,3% of the particules size around 2,01 to 4,00mm, and flow, and grind unsatisfactory, this process, in that way, was considerd inefficient in find a form of to grind flexible polyurethane foam, and it takes necessary, in industrial way, to solve a problem for reciclyng these kind of material.Keywords: Flexible polyurethane foam. Knife mill. Capability. Granulometry.
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Cardenes, Victor, and Álvaro Rubio. "Measure of the color of beach nourishment sands: A case study from the Belgium coast." Trabajos de Geología 35, no. 35 (June 8, 2017): 7. http://dx.doi.org/10.17811/tdg.35.2015.7-18.

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Abstract: The aesthetical perception of a beach as a recreational place is closely linked to the sand color. This is one of the most perceptible characteristics of a beach. Sand color can be altered after a nourishment work. This type of works is becoming more and more popular since they represent a good tool for preserving beaches from erosion. However, only little (or none) attention has been paid to sand color during nourishment works. Colors of the sands from the Belgian coast were determined in the Cielab space, together with their granulometry and composition. Color coordinates range between 50 and 60 for L*, 0.5 to 4.0 for a*, and 10.5 to 16.5 for b*. The composition shows a dominant quartz fraction, followed by shell fragments and finally rock fragments. Granulometry is rather homogeneous, being the grain distribution for the east part of the coast narrower than for the west coast. This work describes the methodology for performing colorimetric analysis in sand beaches before a nourishment work, together with the main acceptance criteria when choosing the appropriate sand for replacement.Keywords: Sand color, granulometry, nourishment, Cielab.Resumen: La percepción estética de una playa como lugar de recreo está estrechamente ligada al color de la arena. Esta es una de las características más perceptibles de una playa. El color de la arena puede ser alterado después de un trabajo de reposición. Este tipo de obras son cada vez más populares ya que representan una buena herramienta para preservar las playas de la erosión. Sin embargo, se ha prestado poca (o ninguna) atención al color de la arena durante los trabajos de reposición. Los colores de las arenas de la costa belga fueron determinados en el espacio Cielab, junto con su granulometría y composición. Las coordenadas de color varían entre 50 y 60 para L*, 0,5 a 4,0 para a* y 10,5 a 16,5 para b*. La composición muestra una fracción de cuarzo dominante, seguida de fragmentos de conchas y finalmente fragmentos de roca. La granulometría es bastante homogénea, siendo la distribución de grano más estrecha para la parte este de la costa que para la costa oeste. Este trabajo describe la metodología para realizar el análisis colorimétrico en playas de arena antes de un trabajo de reposición, junto con los principales criterios de aceptación al escoger la arena adecuada para el reemplazo.Palabras clave: Color de arena, granulometría, reposición, Cielab.
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Fonseca, G., T. F. Maria, N. Kandratavicius, V. Venekey, P. F. Gheller, and F. Gallucci. "Testing for nematode–granulometry relationships." Marine Biodiversity 44, no. 3 (May 22, 2014): 435–43. http://dx.doi.org/10.1007/s12526-014-0241-4.

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15

Günther, Bernd. "On the Continuity of Granulometry." Journal of Mathematical Imaging and Vision 46, no. 1 (July 3, 2012): 29–43. http://dx.doi.org/10.1007/s10851-012-0364-9.

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Pisarska-Jamroży, Małgorzata, Tomasz Kossowski, and Jerzy Jamroży. "Adjustment coefficients for planimetric analysis of the granulometry of coarse-grained sediments." Geologos 17, no. 4 (December 1, 2011): 221–26. http://dx.doi.org/10.2478/v10118-011-0011-8.

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Adjustment coefficients for planimetric analysis of the granulometry of coarse-grained sedimentsThe relationship between results from granulometric analyses of by sieving and by planimetry was investigated by numerical simulation of cubes filled with boulders, cobbles and pebbles. Cross-sections through the sediment were simulated and compared with photos of an actual outcrop wall. Volumes estimated on the basis of planimetric analysis using the cross-sections were compared with sieve analyses, thus allowing to determine adjustment coefficients. The coefficients for pebbles and cobbles have a small standard error, but are larger for boulders, which might be a consequence of too small areas formed by the cross-sections.
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Águas, Murilo Alceu de, Joaquim José Frazão, Leonardo Mariano do Nascimento, João Paulo Souza Carneiro, Ariel Muncio Compagnon, Ana Paula Santos Oliveira, Valter Dos Santos Marques, Vagner Alves da Silva, and Roriz Luciano Machado. "Spatialization of Granulometric and Chemical Characteristics in Irrigated Hydromorphic Soil." Journal of Agricultural Studies 9, no. 3 (August 8, 2021): 153. http://dx.doi.org/10.5296/jas.v9i3.18802.

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Lowlands represent a significant portion of agricultural areas in the world. Thus, understanding the spatial variability of the chemical and granulometric characteristics of hydromorphic soils can contribute to improving soil management and fertility. The objective of this work was to characterize spatial dependence, spatialized chemical attributes, granulometry, and the ideal number of samples in irrigated hydromorphic soil. Soil sampling was conducted in a grid of 10x10 m, in the layers of 0–0.1 and 0.1–0.2 m, totalling 432 composite samples. The evaluated attributes are as follows: pH in water, H+Al, SOM, Ca, Mg, Al, P, K, CTC, V%, Cu, Fe, Zn, Mn, clay, silt, and sand. The texture of the area was classified as loamy–sandy and free in the 0–0.1 and 0.1–0.2 m layers, respectively. The coefficient of variation of the attributes ranged from 2.71% (0–0.1m) to 149.07% (0.1–0.2m). All the attributes studied exhibited moderate to strong spatial dependence. The sample grid with a sampling interval of 20 m referring to the 0–0.1 m layer proved to be adequate. The ideal number of simple samples per composite is 19 for granulometry and macronutrients, and 28 for the micronutrients in the 0–0.1 m layer.
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DJE BI, Tra Yves Bénarèce, Serge-Olivier Konan KOUASSI, Mathieu Nahounou BLEYERE, and Dofara SORO. "Effect of feed granulometry on haematological parameters of Japanese quail (Coturnix japonica) at different stages of growth in Côte d’Ivoire." Journal of Animal Science and Veterinary Medicine 5, no. 5 (October 30, 2020): 136–47. http://dx.doi.org/10.31248/jasvm2020.218.

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The study was carried at the ISMOREL farm of Adiaké in Côte d’Ivoire to determine the effect of feed’s grain size (the granulometry) on haematological parameters of Japanese quail according to the age. Fourteen (14) days old quails were distributed in metallic cages into 5 sub-groups of 5 quails each, according to the type and the food granulometry. From 2 types of food (grower diet and layer diet), 5 different food types by their granulometry were developed. LD 100, LD 50 and LD 75 were developed for the layer diet, then GD 100 and GD 50 for the grower diet. Twenty-five quails on the whole were used in this study. Blood samples were taken on the 10, 28, 42 and 56th day of age in order to perform blood count of each animal. The results showed a significant impact (p < 0.05) of the feed granulometry on the white blood cells parameters. At weeks 4 and 6, a very highly significant increase (p < 0.001) in white blood cells as a whole was observed. The best value for this parameter was obtained in the LD 50 sub-group. At week 8, the best value was obtained in LD 100 for this same parameter. However, despite variations observed in the red blood cells, no influence of food granulometry on these parameters was noted.
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Marinho, Rogério Ribeiro, Antonio Fábio Sabbá Guimarães Vieira, and Feliciano De Souza Maciel. "Análise Montante-Jusante da Granulometria dos Sedimentos de Fundo e Suspenso do Rio Negro e Tributários (Bacia Amazônica, Brasil)." Revista Brasileira de Geografia Física 14, no. 2 (April 14, 2021): 997. http://dx.doi.org/10.26848/rbgf.v14.2.p997-1008.

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O conhecimento das características físicas de sedimentos transportados por grandes sistemas fluviais possui significativa importância para o entendimento de processos geomorfológicos e hidrológicos. O nível de conhecimento dos grandes sistemas fluviais da Amazônia e sua relação com o transporte de sedimentos ainda é limitado, resultando em lacunas de conhecimento sobre a dinâmica da paisagem nesta complexa região. Este trabalho teve como objetivo avaliar a distribuição espacial da granulometria de sedimentos de fundo e suspenso do Rio Negro e tributários. Realizou-se análise da distribuição do tamanho dos sedimentos em seções amostrais localizadas no alto, médio e baixo curso do Rio Negro. Os resultados da análise granulométrica da carga de fundo indicam a predominância de sedimentos com tamanho variando de 0,25 a 1,0 mm (principalmente areia fina, areia média e areia grossa) enquanto no baixo curso as amostram oscilaram de areia fina a partículas lamosas (< 0,50 mm). No Rio Negro os sedimentos suspensos são compostos principalmente de partículas finas de silte (90% menor que 80 µm) com diâmetro mediano (D50) de 25 µm. As características granulométricas apresentadas neste trabalho fornecem subsídios para o entendimento de processos hidrodinâmicos de transporte e deposição dos sedimentos de fundo e suspenso neste gigante sistema fluvial. Upstream-downstream Granulometry Analysis of bed and suspended sediments in the Negro River Basin (Amazon Basin, Brazil)A B S T R A C TThe knowledge of the physical characteristics of sediments transported by large river systems has significant importance for the understanding of geomorphological and hydrological processes. The level of knowledge of the large rivers of the Amazon basin and their relationship with sediment transport is limited, resulting in gaps about the dynamics of the landscape in this complex region. This article analyzes the spatial distribution of granulometry of bed and suspended sediments in the Negro River and tributaries. An analysis of the sediment size distribution was carried out in sample sections located in the upper, middle and lower reaches of the Negro River. The results of the granulometric analysis of the bed load indicate the predominance of sediments with sizes ranging from 0.25 to 1.0 mm (mainly fine sand, medium sand and coarse sand) while in the low course they showed oscillated from fine sand to muddy particles (<0.50 mm). In the Negro River basin the suspended sediments are composed mainly of fine silt particles (90% less than 80 µm) with a median diameter (D50) of 25 µm. The granulometric characteristics presented in this work provide subsidies for the understanding of hydrodynamic processes of transport and deposition of bed and suspended sediments in this huge fluvial system.Keywords: sediment transport, Amazon floodplain, multichannel river, anabranching
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Li, Linzhu, Ryan D. Beemer, and Magued Iskander. "Granulometry of Two Marine Calcareous Sands." Journal of Geotechnical and Geoenvironmental Engineering 147, no. 3 (March 2021): 04020171. http://dx.doi.org/10.1061/(asce)gt.1943-5606.0002431.

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Labati, Ruggero Donida, Angelo Genovese, Enrique Munoz, Vincenzo Piuri, and Fabio Scotti. "3-D Granulometry Using Image Processing." IEEE Transactions on Industrial Informatics 15, no. 3 (March 2019): 1251–64. http://dx.doi.org/10.1109/tii.2018.2856466.

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Hidalgo, Alyssa, Lorenzo Fongaro, and Andrea Brandolini. "Wheat flour granulometry determines colour perception." Food Research International 64 (October 2014): 363–70. http://dx.doi.org/10.1016/j.foodres.2014.06.050.

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Zegardło, Bartosz, Tomasz Drzymała, Paweł Ogrodnik, and Beata Jaworsk. "Examination of granulometry of ceramic dust which derogations while disposing waste sanitary ceramics for the use of their as addition to the concrete." AUTOBUSY – Technika, Eksploatacja, Systemy Transportowe 19, no. 6 (June 30, 2018): 318–21. http://dx.doi.org/10.24136/atest.2018.084.

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The purpose of the research presented in this article was to assess the granulometry of ceramic dust in terms of their use as an additive to concrete. The material for testing came from postindustrial sanitary ceramic waste, which was subjected to a crushing process in jaw crushers. A research stand consisting of a Horoir LA-300 laser particle analyzer connected to a computer equipped with appropriate software was used to study the granulometric characteristics. As a side feature, the dust density was examined using a Le Chatelier flask. The results of the tests carried out were compared with the data obtained for the traditionally used concrete additive - silica volatile dusts.
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Feijoo Calle, Ernesto Patricio, and Bernardo Andrés Feijoo Guevara. "Characterization of the unconfined compressive strength test in rocks by fine granulometry." Minerva 1, no. 3 (December 7, 2020): 5–14. http://dx.doi.org/10.47460/minerva.v1i3.12.

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This work presents a proposal for the characterization of the UnconfinedCompressive Strength test (UCS), through a series of operations that can be carried outwithout inconvenience in the field. Initially, fresh rock samples are obtained from outcropsin the area and specimens of specific dimensions are made. After the test specimenelaboration phase, crushing and granulometric classification tests are carried out witha set of specimens and in parallel with a second group, UCS tests are carried out. With theresults, the rock is characterized by graphing granulometric curves and in this graph theareas of fine granulometry are focused, inserting in these areas, the average value of UCS,with which it can be identified and determined when it is really necessary and It is inevitableto send rock samples to laboratories, thus saving time and money for the mining project. Keywords: compression, crushing, granulometry, rock. References [1] F. Blyth and M. de Freitas. Geología para Ingenieros. México: CEGSA, 2003. [2] F. Escolano and A. Mazariegos de la Serna. Guía de reconocimiento de rocas en Ingeniería Civil. España: Editorial Garceta, Escuela Técnica Superior de Ingeniería Civil, Universidad Politécnica de Madrid, 2014. [3] G. Stefano and J. Segovia. Notas del curso de Arte Minero I. Ecuador: Universidad del Azuay, 1991. [4] A. Maistri. Guía al Curso de Tratamiento de Minerales y a las Prácticas de Laboratorio. Ecuador: Universidad del Azuay, 1993. [5] O. Bustamante. Conminución de Minerales Trituración y Molienda. Colombia: Instituto de Minerales CIMEX, Universidad Nacional de Colombia-Sede Medellín, 2006. [6] E. Feijoo, C. Flores and B. Feijoo, "The Concept of the Granulometric Area and Its Relation with the Resistance to theSimple Compression of Rocks," 2019 7th International Engineering, Sciences and Technology Conference (IESTEC), Panama,Panama, 2019, pp. 52-56. [7] E. Feijoo and C. Iñiguez, “Corte en rocas y su relación con la resistencia a compresión simple”, RISTI, N.o E 30, pp. 59-67,junio 2020. [8] M. Galván. Mecánica de Rocas. Correlación entre la Resistencia a Carga Puntual y la Resistencia a Compresión Simple. Colombia: Universidad del Valle, 2015. [9] W. Marín. Evaluación de parámetros materiales de fractura en roca intacta. Colombia: Universidad Nacional de Colombiasede Medellín, 2017. [10]E. Feijoo and J. Padrón, “La resistividad de rocas y su relación con la resistencia a compresión simple en mina”, UCT, vol. 24, Núm. 99, pp. 61-67, abril 2020.
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Teodorescu, Laura, Ayed Ben Amara, Nadia Cantin, Rémy Chapoulie, Cătălin Ducu, Sorin Ciucă, Claudiu Tulugea, Carol Terteci, and Mărioara Abrudeanu. "Characterization of Archaeological Artefacts Using Methods Specific to Materials Science: The Case Study of Dacian Ceramics from 2nd c. BC to 1st c. AD." Materials 14, no. 14 (July 13, 2021): 3908. http://dx.doi.org/10.3390/ma14143908.

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Combined analysis methods such as optical microscopy (OM), cathodoluminescence (CL) microscopy, X-ray diffraction (XRD), and scanning electron microscopy–energy dispersive X-ray spectrometry (SEM–EDX) have made it possible to obtain the first physico-chemical data of Dacian potsherds, exhumed at the archeological site of Ocnița-Buridava, Romania; the samples were provided by the “Aurelian Sacerdoțeanu” County Museum Vâlcea, dating from the 2nd century BC to the 1st century AD. The mineralogical and petrographic analyses revealed two types of ceramic pastes, taking into account the granulometry of the inclusions and highlighting the choice of the potter for fabricating the ceramic either by wheel or by hand. All samples showed an abundance in quartz, mica (muscovite and biotite), and feldspars. These observations were confirmed by cathodoluminescence imagery, revealing heterogeneous pastes with varied granulometric distributions. The XRD patterns indicated the presence of the mineral phases, indicating a firing temperature below 900 °C. The wheel-made ceramics have a fine, compact matrix with very fine inclusions (<40 µm). On the other hand, the hand-made ceramics present a coarse matrix, with inclusions whose granulometry reaches approximately 2 mm. The difference between these two types of ceramics is also confirmed by the mineralogical and chemical analysis. The wheel-made potsherds are more abundant in MgO, Al2O3, and CaO contents.
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Zhukov, Dmitriy, Nikolay Makarov, Maria Vartanyan, and Tatiana Guseva. "IMPROVING ENERGY EFFICIENCY OF SILICON CARBIDE CERAMICS PRODUCTION BY BATCH REGULATION." CBU International Conference Proceedings 3 (September 19, 2015): 461–67. http://dx.doi.org/10.12955/cbup.v3.639.

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The article discusses an energy-efficient method for producing SiC-based composites via doping with oxide eutectic compositions and batch granulometry regulation. The influence of batch granulometry on physico-mechanical properties of ceramics is studied, and fractions ratio is determined allowing us to obtain a dense material with improved strength and fracture toughness. Such ceramics shows excellent mechanical behavior and holds much promise as a structural and armor material.
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Mauger, A., M. Escorne, V. Paul‐Boncour, A. Percheron‐Guegan, J. C. Achard, and J. Barrault. "Magnetic anisotropy and granulometry of Ni/CeO2catalyst." Journal of Applied Physics 63, no. 8 (April 15, 1988): 3236–38. http://dx.doi.org/10.1063/1.340853.

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Kákay, Attila, M. W. Gutowski, L. Takacs, V. Franco, and L. K. Varga. "Langevin granulometry of the particle size distribution." Journal of Physics A: Mathematical and General 37, no. 23 (May 25, 2004): 6027–41. http://dx.doi.org/10.1088/0305-4470/37/23/005.

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Araújo, Sidnei Alves de, Jorge Henrique Pessota, and Hae Yong Kim. "Beans quality inspection using correlation-based granulometry." Engineering Applications of Artificial Intelligence 40 (April 2015): 84–94. http://dx.doi.org/10.1016/j.engappai.2015.01.004.

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Lu, Huayu, and Zhisheng An. "Pretreated methods on loess-palaeosol samples granulometry." Chinese Science Bulletin 43, no. 3 (February 1998): 237–40. http://dx.doi.org/10.1007/bf02898920.

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31

Boschini, F., V. Delaval, K. Traina, N. Vandewalle, and G. Lumay. "Linking flowability and granulometry of lactose powders." International Journal of Pharmaceutics 494, no. 1 (October 2015): 312–20. http://dx.doi.org/10.1016/j.ijpharm.2015.08.030.

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32

Junhao, Y., Z. Xiubin, and Q. Jie. "A novel optical granulometry algorithm for ore particles." Journal of Mining and Metallurgy, Section B: Metallurgy 46, no. 1 (2010): 87–95. http://dx.doi.org/10.2298/jmmb1001087j.

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This paper proposes a novel algorithm to detect the particle size distribution of ores with irregular shapes and dim edges. This optical granulometry algorithm is particularly suitable for blast furnace process control, so its result can be used directly as a reliable basis for control system dynamics optimization. The paper explains the algorithm and its concept, as well as its method, which consists of five steps to detect ore granularity and distribution. A series of comparative experiments under industrial environments proved that this novel algorithm, compared with conventional ones, improves the accuracy of granulometry.
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Prado, Kharine, Fernando Silva Albuquerque, and Guilherme Bravo de Oliveira Almeida. "Influence of granulometry, cement content, and moisture in the mechanical performance of the cemented crushed stone." TRANSPORTES 28, no. 1 (April 30, 2020): 81–98. http://dx.doi.org/10.14295/transportes.v28i1.1861.

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The Cemented Crushed Stone (C2, as the South African Classification) was widely used on the main high-traffic Brazilian highways in the 1970s and 1980s. However, it presents several limitations for its use in the road work related to the properties of the material and its almost fragile nature, since as soon as the large variations in the tensile strain take place along the loading cycle, critical and accelerated degradation also occur, leading to material fatigue distress. Several factors stand out as probable causes for the intense and rapid process of fatigue, the main ones being: granulometry, cement content, and moisture content. In this way, a study was carried out to analyze the mechanical properties of C2 based on granulometry variation in relation to the cement and moisture content. It was noted that the mixture with the best joint performance was the one with the highest percentage of the sand fraction, highest cement content, and molded below the optimum moisture. Some recommendations were made for the mix design of C2, such as the definition of a granulometric range that considers the analysis of the aggregate large/small ratio in order to obtain a greater gain of maximum dry specific mass, as well as the use of cement contents above 4%, since below that the cementation will be insufficient. In addition, optimized ratios (aggregate + cement + water) should be defined by performing the mechanical analyzes listed in this paper, in order to select the best performance mixture to be applied in the road works.
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Donald-l’or NYAME MBIA, Samuel FOTO MENBOHAN, Serge Roger GWOS NHIOMOCK, Mathias NWAHA, Yvonne Laure TCHOUAPI, Wilfried Christiane Noel BETSI, Blaise Rollinat MBOYE, and Eric Belmond BIRAM À NGON. "Influence of granulometry on the distribution of benthic macro invertebrates in some streams of the Mvilla and Haut-Nyong watersheds in Cameroon." World Journal of Advanced Research and Reviews 17, no. 2 (February 28, 2023): 658–77. http://dx.doi.org/10.30574/wjarr.2023.17.2.0278.

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This study was conducted from November 2018 to October 2019 in 8 forested streams in the Haut-Nyong and Mvilla watersheds to determine the influence of substrates granulometry on benthic macroinvertebrates. The physicochemical analyses showed highly oxygenated, weakly mineralized and slightly acidic waters. The granulometric analyses reveal 9 categories of substrates depending on the scale of sand, sand+gravel or sand+mud. Sampling of benthic macroinvertebrates allowed the collection of 15058 organisms divided into 5 classes, 14 orders and 49 families. The results showed a taxonomic richness strongly influenced by the nature of the substrate. The combination of coarse sand + silt + dead leaves was more favored the development of benthic macroinvertebrates with 48 families. The taxonomic richness associated to the different index revealed good ecological quality of Sounou, Bengo'o and Lo'o rivers.
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Lopes, Marília Barcelos Souza, Taynar Coelho de Oliveira Tavares, Danilo Alves Veloso, Niléia Cristina da Silva, and Rodrigo Ribeiro Fidelis. "Cowpea bean production under water stress using hydrogels." Pesquisa Agropecuária Tropical 47, no. 1 (March 2017): 87–92. http://dx.doi.org/10.1590/1983-40632016v4743398.

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ABSTRACT The population increase and the need of intensifying food production, coupled with the scarcity of water resources, have led to the search of alternatives that reduce consumption and optimize the water use during cultivation. In this context, hydrogels become a strategy in agricultural management, due to their water retention capacity in the soil and availability to plants. This study aimed at evaluating the efficiency of hydrogels on the development and production of cowpea bean ('Sempre-verde' cultivar) under water stress, in a greenhouse. The experiment was performed in a randomized block design, with five replications, in a 4 x 5 factorial scheme, consisting of four types of hydrogel (Hydroplan-EB HyA, with granulometry of 1-3 mm; Hydroplan-EB HyB, with granulometry of 0.5-1 mm; Hydroplan-EB HyC, with granulometry < 0.5 mm; Polim-Agri, with granulometry of 1-0.5 mm) and five concentrations (0 g pot-1; 1.5 g pot-1; 3 g pot-1; 4.5 g pot-1; 6 g pot-1). The following traits were evaluated: number of pods per plant, number of grains per pod and grain yield. The highest concentration (6 g pot-1) resulted in a higher number of pods and yield for all the hydrogels, especially for HyC and Polim-Agro, which presented 7.4 pods plant-1 and 7.0 pods plant-1, with yield of 15.43 g plant-1 and 16.68 g plant-1, respectively. The use of hydrogel shows to be efficient for reducing yield losses under water stress.
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Pernicova, Radka. "Shape Characteristics and Granulometry of Recycled Silicon Carbide Waste." Materials Science Forum 928 (August 2018): 273–76. http://dx.doi.org/10.4028/www.scientific.net/msf.928.273.

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The main aim of this paper is determined of properties, especially granulometry, of recycled silicon carbide waste and its possibility of using in new cementitious recipes. Paper is focused on importance of creation of grain curves and on relationship between silicon carbide and compounds in concrete matrix. Purpose of this research is using waste material and therefore minimalizes of its production and reduces ecological effect on environment by its recycling. Set of granulometry measurements of each recycled materials were done as well as its grain characteristic. The End of work includes the evaluation of the possible use of SiC waste for cement mixtures.
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Leyton-Vergara, Matías, Alexis Pérez-Fargallo, Jesús Pulido-Arcas, Galo Cárdenas-Triviño, and Jeremy Piggot-Navarrete. "Influence of Granulometry on Thermal and Mechanical Properties of Cement Mortars Containing Expanded Perlite as a Lightweight Aggregate." Materials 12, no. 23 (December 3, 2019): 4013. http://dx.doi.org/10.3390/ma12234013.

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This research aims at clarifying the influence of the granulometry of expanded perlite, on the thermal conductivity, structural strength, density, and water absorption of lightweight mortars. Three original perlite gradations have been obtained and three pairs of twin test mortars have been tested with those gradations. SEM tests have also been run to clarify the interaction, at a microscopic level, between the expanded perlite and the cement grouting. The results indicate that the mere manipulation of the granulometry may have a considerable and very beneficial effect on the mixture’s properties, such as thermal conductivity and water absorption.
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Buček, Daniel, Martin Orfánus, and Peter Dušička. "Non-intrusive bedload granulometry using automated image analysis." Pollack Periodica 14, no. 3 (December 2019): 75–85. http://dx.doi.org/10.1556/606.2019.14.3.8.

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Vandličková, Miroslava, Iveta Marková, Linda Makovická Osvaldová, Stanislava Gašpercová, Jozef Svetlík, and Jozef Vraniak. "Tropical Wood Dusts—Granulometry, Morfology and Ignition Temperature." Applied Sciences 10, no. 21 (October 28, 2020): 7608. http://dx.doi.org/10.3390/app10217608.

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The article considers the granulometric analysis of selected samples of tropical wood dust from cumaru (Dipteryx odorata), padauk (Pterocarpus soyauxii), ebony (Diospyros crassiflora), and marblewood (Marmaroxylon racemosum) using a Makita 9556CR 1400 W grinder and K36 sandpaper, for the purpose of selecting the percentages of the various fractions (<63; 63; 71; 200; 315; 500 μm) of wood dust samples. Tropical wood dust samples were made using a hand orbital sander Makita 9556CR 1400 W, and sized using the automatic mesh vibratory sieve machine Retsch AS 200 control. Most dust particles (between 50–79%) from all wood samples were under 100 μm in size. This higher percentage is associated with the risk of inhaling the dust, causing damage to the respiratory system, and the risk of a dust-air explosive mixture. Results of granulometric fractions contribution of tropical woods sanding dust were similar. Ignition temperature was changed by particle sizes, and decreased with a decrease in particle sizes. We found that marblewood has the highest minimum ignition temperature (400–420 °C), and padauk has the lowest (370–390 °C).
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Frery, Alejandro C., Lorena Rivarola-Duarte, Viviane Carrilho Leão Ramos, Adeildo Soares Ramos, and William Wagner Matos Lira. "Stochastic particle packing with specified granulometry and porosity." Granular Matter 14, no. 1 (December 2, 2011): 27–36. http://dx.doi.org/10.1007/s10035-011-0300-5.

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Günther, Bernd. "On the Compatibility of Granulometry with Wavelet Analysis." Journal of Mathematical Imaging and Vision 45, no. 1 (May 16, 2012): 69–75. http://dx.doi.org/10.1007/s10851-012-0345-z.

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Hryciw, Roman D., Hyon-Sohk Ohm, and Jie Zhou. "Theoretical Basis for Optical Granulometry by Wavelet Transformation." Journal of Computing in Civil Engineering 29, no. 3 (May 2015): 04014050. http://dx.doi.org/10.1061/(asce)cp.1943-5487.0000345.

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Rumiantceva, Mariia, and Andrey Filchenkov. "Deep Learning and Pseudo-Labeling for Ore Granulometry." Procedia Computer Science 212 (2022): 387–96. http://dx.doi.org/10.1016/j.procs.2022.11.023.

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44

Kaliyeva, A., Ye Tileuberdi, L. Galfetti, and Ye Ongarbayev. "Effect of Mechanical Activation on the Reactivity of Composites for Flameless Heaters." Eurasian Chemico-Technological Journal 22, no. 2 (June 30, 2020): 141. http://dx.doi.org/10.18321/ectj962.

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The work is devoted to the activation of metal powder mixtures suitable for use in flameless food heaters. Four activated powders have been manufactured starting from the reference material using a standard technique. Activated powders exhibited a significant increment of the reactivity for the reference mixture. Experimental tests were carried out to characterize the resulting composites in terms of the combustion rate. The oxidation reaction at a low heating rate was monitored using a SEIKO EXTAR II thermal analysis machine and its tests were carried out at open air in temperature range starting from room temperature up to 1150 °C at the heating rate of 10 °C/min. Powders activated by mechanical activations and the initial mixture of materials were characterized in terms of apparent density, absorbed surfactant with the mass of sizing, i.e. granulometry, oxidation properties at a low heating rate. With increase the grinding time, the color of the powder switches to dark tones. Powder granulometry was performed on a MALVERN laser granulometer MASTERSIZER 2000 using dry block SCIROCCO. Three measurements for each sample were performed and the results were averaged. The tests were recorded and processed by digital technology to make the combustion rate of the powders, also the experimental setup used for investigations was presented. The sample AlS-AlF_MnO2_SiO-150 is characterized by the lowest metal content, and by the most regular combustion propagation. The powder AlS-AlF_MnO2_SiO-50 features the highest metal content, but the less regular combustion propagation. The use of mechanical activation allows increasing the number of nanoscale materials, which contributes to the synthesis of highly effective flameless food heaters.
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Araujo, José Anchieta de, José Humberto Vilar da Silva, Fernando Guilherme Perazzo Costa, Janaína Maria Batista de Sousa, Patrícia Emília Naves Givisiez, and Nilva Kazue Sakomura. "Effect of the levels of calcium and particle size of limestone on laying hens." Revista Brasileira de Zootecnia 40, no. 5 (May 2011): 997–1005. http://dx.doi.org/10.1590/s1516-35982011000500009.

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This experiment was conducted to evaluate the effect of levels of calcium (Ca) and particle size of limestone (LS) for laying hens. It was used 216 Dekalb White laying hens at 25 to 49 weeks of age in a completely randomized design in a 3 × 2 factorial arrangement, composed of three levels of calcium (3.92, 4.02 and 4.12%) and two particle sizes of limestone (thin - 0.60 mm; and thick - 1.00 mm), resulting in 6 treatments with six replicates of six birds. There was no significant effect of levels of calcium and limestone particle size neither of the interaction calcium × particle size for feed intake, egg weight, specific gravity, shell thickness, shell percentage, Haugh unit, calcium and phosphorus digestibility and percentage of digestive tract. Production, mass, conversion by mass and conversion by egg dozen had their best results with 4.12% of calcium in the diet. Percentage of gizzard and feed intake observed at 3:00 p.m. improved as limestone granulometry improved from 0.60 to 1.00 mm. There was an interaction effect among calcium level and limestone granulometry for breaking strength of tibia, bone density, length of the small intestine and feed intake at 6:00 a.m.; 9:00 a.m., 12:00 p.m., 6:00 p.m. and 9:00 p.m., respectively. It is recommended the addition of 4.12% of calcium and limestone in the thick granulometry (1.00 mm) for a better performance of commercial laying hens. More studies are needed to elucidate the mechanisms involved in the alteration of nutritional behavior of laying hens in response to changes in the levels of calcium and in the granulometry of limestone in the rations.
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46

Staněk, Theodor. "The Influence of Raw Meal Granulometry on the Formation and Properties of Clinker." Solid State Phenomena 296 (August 2019): 9–14. http://dx.doi.org/10.4028/www.scientific.net/ssp.296.9.

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Cement production belongs to the most important branch of industry. It is marked out by processing of great quantity of natural raw materials and of considerable energetic demand. Not only the intensification of the contemporary production processes is the permanent effort of the cement industry, but also the search for new energy less demanding methods. The paper is focused on one of the most important components of the intensification of cement production – on the preparation of raw meal. It mainly deals with the influence of granulometry and microhomogeneity of the input raw materials on the quality and economy of the process of production and on the final product. The study was carried out mainly by methods of optical microscopy and the determination of technological parameters of cements. It has been found that a change in granulometry of raw meal has a significant impact on the formation rate of the clinker phases. Subsequently, the grindability of the clinker and the strength of the cement are influenced, especially in the short-term hydration. Change of granulometry and homogeneity of raw meal can greatly optimize the quality and economy of the cement production process.
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47

Khelladi, Racha Medjda Bouchenak, Abdelghani Chiboub Fellah, Maxime Pontié, and Fatima Zohra Guellil. "Influence of Particle and Grain Size on Sand Filtration: Effect on Head Loss and Turbidity." Aquatic Science and Technology 8, no. 2 (August 11, 2020): 36. http://dx.doi.org/10.5296/ast.v8i2.17512.

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Sand filtration is an eco-friendly method to treat either drinking water or wastewater ; it requires only natural granular media. It is also easy to use and to maintain ; the only problem they face is clogging that affects filter performance, that can be detected when head loss or turbidity increase. The purpose of this work is to see what are the factors that influence the performance of filter operation, for this, we used a pilot consisting on a circular column filled with sand (from South Algeria), where various parameters were tested; pressure, flow rate, sand granulometry, suspended matters and particle concentration of the water which is filtered. After eighteen weeks of operation, we have found that head loss increases by decreasing granulometry and increasing flow rate, pressure, particle size, and concentration. However, turbidity increases by decreasing particle size and increasing granulometry and particle concentration. Turbidity and head loss have different behaviour towards the same parameter; that is why it is necessary to take them into account in order to find a compromise between acceptable head loss / turbidity for a good functioning of the filter.
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48

Morais, Letícia, Manoel Cordão-Neto, and Alessandro Tarantino. "Aggregation process of kaolinite clay." E3S Web of Conferences 92 (2019): 03002. http://dx.doi.org/10.1051/e3sconf/20199203002.

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Clay geomaterials pose a great challenge in geotechnical design due to their complex mechanical behaviour. Despite the vast research on clay mechanical behaviour, mechanisms occurring at the particle-scale still remain largely unknown. Particle-to-particle interactions include electro-chemical forces, which can be in turn associated with repulsive/attractive Coulomb interaction and attractive van der Waals force. This work aims to investigate the role of attractive forces (van der Waals and Coulomb) via their control of the process of aggregation (attractive forces tend to form aggregates of clay particles). Dry clay particles were compressed under high stress to reduce particles distances and activate attractive van der Waals and Coulomb forces. Particle size distribution was then measured using laser granulometry to explore aggregation formation. Laser granulometry tests were performed with and without ultrasound and with and without dispersant. Results show that the higher the compressive stress applied to the sample, the bigger is the ‘particle’ size measured by the laser granulometry, which corresponds to formation of aggregation due to attractive forces. Ultrasound appeared to disaggregate the aggregates thus suggesting that van der Waals and Coulomb forces are sensitive to dynamic loading.
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49

Parry, David M., Michael A. Kendall, Ashley A. Rowden, and Stephen Widdicombe. "Species body size distribution patterns of marine benthic macrofauna assemblages from contrasting sediment types." Journal of the Marine Biological Association of the United Kingdom 79, no. 5 (October 1999): 793–801. http://dx.doi.org/10.1017/s0025315499000971.

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Species body size spectra have been constructed for macrofauna assemblages from four sites with contrasting sediment granulometry and heterogeneity in and around Plymouth Sound. The number of species and species turnover (β diversity) were higher on coarse sediment. While the fauna were distinct between sites, the median geometric size-class was conservative (class 14; 0.153–0.305 mg dry blotted weight). Only one site had significantly lower heterogeneity within the species size spectrum, yet this was the most heterogeneous sediment. As such, we were unable to reject the null hypothesis that species body size distribution patterns are conservative despite differences in sediment granulometry and heterogeneity.
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50

Mota, Jaedson Cláudio Anunciato, Carlos Eduardo Linhares Feitosa, Lucas de Sousa Oliveira, José Israel Pinheiro, Alfredo Mendonça de Sousa, Thiago Leite de Alencar, Márcio Godofrêdo Rocha Lobato, Alexandre dos Santos Queiroz, and Ícaro Vasconcelos do Nascimento. "Pipette Method: Errors Resulting From Aliquot Collection Depth in Soil Clay Quantification." Journal of Agricultural Science 11, no. 2 (January 15, 2019): 244. http://dx.doi.org/10.5539/jas.v11n2p244.

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Granulometry represents the relative proportions of the fractions that compose the soil, being an important agronomic tool to infer mean values of density, water availability and cation exchange capacity, besides being useful in soil classification. Among the methods employed to determine the fractions composing the soil, those which consider the separation by sedimentation for the clay fraction still have problems in the analytical protocol, which are directly responsible of errors in the results obtained. Given the above, this study aimed to evaluate the best pipette immersion depth to collect the aliquot containing only clay, to calculate and discuss the errors associated with collection of the aliquot containing clay fraction in soil granulometric analysis. Samples for granulometric analysis were collected in the superficial layer and top of the B horizon of an Argissolo Amarelo, corresponding to the textural classes sandy loam and sandy clay. Regardless of soil textural class, the depth h = 5 cm established in the calculation using the Stokes&rsquo;s equation leads to overestimation and underestimation of clay and silt fractions in the soil. The collection should be performed with the pipette tip positioned at h/2 = 2.5 cm.
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