Готові списки джерел за темами / Fines production

Добірка наукової літератури з теми "Fines production"

Автор: Grafiati
Опубліковано: 10 грудня 2022
Оновлено: 28 січня 2023

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Статті в журналах з теми "Fines production"

1

Buravchuk, N. I., and O. V. Guryanova. "Production of fuel briquettes from anthracite fines." Solid Fuel Chemistry 48, no. 4 (July 2014): 260–64. http://dx.doi.org/10.3103/s036152191404003x.

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2

Guimaraes, M. S., J. R. Valdes, A. M. Palomino, and J. C. Santamarina. "Aggregate production: Fines generation during rock crushing." International Journal of Mineral Processing 81, no. 4 (January 2007): 237–47. http://dx.doi.org/10.1016/j.minpro.2006.08.004.

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3

Brožovský, Jiří. "Masonry Cements with Fines from Aggregate Production." Advanced Materials Research 1000 (August 2014): 211–14. http://dx.doi.org/10.4028/www.scientific.net/amr.1000.211.

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Masonry cement consists of Portland cement, inorganic materials and optional additives. Natural mineral materials are included in inorganic materials. The paper states knowledge gained during research of properties of masonry cements in which fine parts originating in production of aggregate of two types – amphibolite and grandiorite – were used as inorganic content. If the content of fine parts in cement is from 50% to 75%, masonry cement of strength marks 5 and 12.5 can be produced.
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4

Zhou, Wen Juan, Wei Niu, Jia Long Chen, and Gui Bin Ji. "Influence of the Fineness of Micro-Fines on the Performance of Cement and Mortar." Key Engineering Materials 477 (April 2011): 102–7. http://dx.doi.org/10.4028/www.scientific.net/kem.477.102.

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With the rapid development of fundamental construction, natural sand resources is getting less and less, artificial sand has become a new kind of sand source. Artificial sand’s production can produce a certain amount of aggragate micro-fines, rational use of micro-fines will be an important factor about affecting application of artificial sand. In this paper，impact of fineness and volume of artificial sand on cement and mortar performance is studied systematically, provides technical basis for the effective use of micro-fines. The experimental results show that micro-fines decreases water requirement of normal consistency and shorten setting time of cement, appropriate fineness micro-fines will reduce water requirement, improve strength, less shrinkage of mortar. The pore structure results show, finer micro-fines refines the pore structure, reduces the porosity of mortar.
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Tan, Yunhui, Yan Li, Margaretha C. M. Rijken, Karim Zaki, Bin Wang, Ruiting Wu, Oya Karazincir, and Wade Williams. "Modeling of Production Decline Caused by Fines Migration in Deepwater Reservoirs." SPE Journal 25, no. 01 (August 13, 2019): 391–405. http://dx.doi.org/10.2118/187263-pa.

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Summary Many deepwater wells experience steep productivity declines. Some field observations indicate that this decline is partly attributable to fines-migration effects. In this paper, we present a numerical workflow to simulate the effect (over time) of flow-induced fines migration on production decline in deepwater reservoirs. A permeability-reduction function was extracted from long-term coreflood tests and implemented into a reservoir simulator. Using the permeability-reduction function, production degradation caused by fines migration was simulated in a detailed single-well model. From previous research, it was understood that fines migration does not start until the flow velocity is greater than the critical velocity. After many long-term coreflood tests, or extended fines-migration (EFM) tests, we concluded that the permeability damage induced by fines migration is a function of the pore-volume (PV) throughput (fluid volume flowing through the core divided by the PV of the core). To address these observations, the numerical model was updated such that the interstitial flow velocity was tracked in each individual cell. When the interstitial velocity is greater than the critical velocity, the cell's permeability follows the permeability-reduction trend obtained from laboratory data. Validation of the workflow is performed using a cylinder model to match the laboratory test core-plug data. A detailed 3D model was constructed to study the fines-migration effect in each part of the near-wellbore (e.g., perforation, fracture) region and the reservoir. As expected, fines migration started near the perforation where the flow velocity was the highest. Depending on the permeability-decline rate, the production asymptotes eventually reached a constant value after a certain period. Both the decline rate and the ultimate residual permeability had a strong effect on the final production. Sensitivities were run to study the effect of fines migration in different completions. To the authors’ understanding, this is the first time that laboratory-based fines-migration data were incorporated into a reservoir simulator to predict the production decline using experiment-based fines-migration functions. This workflow will help reservoir engineers predict the damage caused by fines migration, predict production decline, and plan for remediation.
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Peng, Xiaolong, Suyang Zhu, Zhenjiang You, Zhimin Du, Peng Deng, Chaowen Wang, and Mingwei Wang. "Numerical Simulation Study of Fines Migration Impacts on an Early Water Drainage Period in Undersaturated Coal Seam Gas Reservoirs." Geofluids 2019 (December 30, 2019): 1–16. http://dx.doi.org/10.1155/2019/5723694.

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Coal fines migration exerts negative impacts on early water drainage of undersaturated coal seam gas (CSG) reservoirs. The complicated migration process results in ineffective and inaccurate forecast of coal fines production. Hence, a robust modelling tool is required to include the mechanisms of fines migration and to predict their impacts on rock and production. In this paper, fines migration in coal is categorized into three stages: generation, migration, and deposition processes. The corresponding models for different stages are established, including (1) a fines generation model, (2) the maximum fines-carrying concentration model and deviation factor of the modified Darcy model, (3) a fines deposition model, and (4) a dynamic permeability and porosity model. The above models are coupled with a water flow model, solved numerically using the finite difference method. Then, two dewatering strategies, including fast and moderate depressurization, are compared using the proposed models to study their effects on coal properties and following production. Finally, the production history of a CSG well in the Qinshui Basin, China, is utilized for history matching in a field case study. The simulation results indicate that new fines will be generated in a fast depressurization process and the water rate decline reduces the cleat permeability significantly. The newly generated fines can enhance the permeability temporarily, but they will block the flow channels and bring serious damage to the permeability when the water rate declines. The moderate depressurization strategy can produce the coal fines in a continuous mode, and the formation damage induced by fines deposition can be reduced to the acceptable level, which is the more reliable way to maintain well productivity. In addition, multiple well shut-in can trigger the irreversible fines deposition, reduce the permeability, and decrease the production rate.
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Padfield, A. M., P. J. Carey, C. D. Hills, and A. B. Poole. "Reuse of quarry fines in production of secondary aggregates." Proceedings of the Institution of Civil Engineers - Engineering Sustainability 157, no. 3 (September 2004): 149–54. http://dx.doi.org/10.1680/ensu.2004.157.3.149.

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8

Önal, Mehmet Ali Recai, Lopamudra Panda, Prasad Kopparthi, Veerendra Singh, Prakash Venkatesan, and Chenna Rao Borra. "Hydrometallurgical Production of Electrolytic Manganese Dioxide (EMD) from Furnace Fines." Minerals 11, no. 7 (July 1, 2021): 712. http://dx.doi.org/10.3390/min11070712.

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The ferromanganese (FeMn) alloy is produced through the smelting-reduction of manganese ores in submerged arc furnaces. This process generates large amounts of furnace dust that is environmentally problematic for storage. Due to its fineness and high volatile content, this furnace dust cannot be recirculated through the process, either. Conventional MnO2 production requires the pre-reduction of low-grade ores at around 900 °C to convert the manganese oxides present in the ore into their respective acid-soluble forms; however, the furnace dust is a partly reduced by-product. In this study, a hydrometallurgical route is proposed to valorize the waste dust for the production of battery-grade MnO2. By using dextrin, a cheap organic reductant, the direct and complete dissolution of the manganese in the furnace dust is possible without any need for high-temperature pre-reduction. The leachate is then purified through pH adjustment followed by direct electrowinning for electrolytic manganese dioxide (EMD) production. An overall manganese recovery rate of >90% is achieved.
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9

Ray, A., R. Sriravindrarajah, J. P. Guerbois, P. S. Thomas, S. Border, H. N. Ray, J. Haggman, and P. Joyce. "Evaluation ofwaste perlite fines in the production of construction materials." Journal of Thermal Analysis and Calorimetry 88, no. 1 (April 2007): 279–83. http://dx.doi.org/10.1007/s10973-006-8107-z.

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10

Vititnev, Aleksandr, Roman Marchenko, Venera Matygulina, Anastasiya Rubinskaya, and Anna Shishmareva. "Wood fibre recapture from process water during wet-forming of fiberboard: Process modelling with environmental and economic assessment." BioResources 18, no. 1 (January 3, 2023): 1330–46. http://dx.doi.org/10.15376/biores.18.1.1330-1346.

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This article presents the rationale for modelling the process of internal recapture of wood fibre from wastewater in fibreboard production using conventional refining methods and a new refiner disc design. New experimental studies to obtain mathematical dependencies for confirming the possibility of reusing cellulosic fines in comparing conventional and new refiner discs for fibreboard production are presented. Models reflecting the internal reuse of cellulosic fines from wastewater were developed. In this article, for comparative assessment of the efficiency of the proposed technologies, an environmental and economic assessment of cellulosic fines in modelling the process of its obtainment in fibreboard production was performed.
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Більше джерел

Дисертації з теми "Fines production"

1

Richard, Udoh Richard. "SAND & FINES IN MULTIPHASE OIL AND GAS PRODUCTION." Thesis, Norges teknisk-naturvitenskapelige universitet, Institutt for petroleumsteknologi og anvendt geofysikk, 2013. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-24075.

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This thesis work focuses on multiphase flow in the oil and gas industry. As differences in temperatures and pressures come to play from the reservoir to the surface, in tubing and in pipelines, gas tend to dissolve and evolve out from oil, with water and solid particles making their way into the production flow stream, giving rise to a multiphase gas-liquid-solid production and transportation. A review of sand and fines production worldwide was carried out and concluded that sand production is a common occurrence in the petroleum industry, present in all the major oil producing regions of the world. Multiphase flow patterns were equally discussed in this work stating the different flow regimes available in the vertical and horizontal pipe system. HYSYS was used to obtain fluid properties for volatile oil used in the determination of major parameters such as fluid velocities, hold-ups and pressure drop. Results did show that particle velocity to a large extent depended on the fluid velocity, which would always be higher with increasing amounts of gaseous phase present as experienced in annular and slug flow. The velocity profile chart showed the sand peak velocities in annular and slug flow as 13.2 m/s and 9.8 m/s. It was also observed that pressure drop along a pipe will under normal conditions tend give a positive slope when plotted against superficial fluid velocities.
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2

Hadjri, Karim. "The viability of 'no-fines' for the production of appropriate housing in Algeria." Thesis, Oxford Brookes University, 1992. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.315276.

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3

Gabites, John Raymond. "Washable Baghouse Operation and Design as Applied to Milk Powder Production." Thesis, University of Canterbury. Chemical and Process Engineering, 2007. http://hdl.handle.net/10092/3270.

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Анотація:
The use of washable baghouses for fines collection in milk powder plants has been investigated. The main aim of this study was to increase the fundamental understanding of both operation and design of washable baghouses for application in milk powder plants. This work has focussed on the industrial scale. Industrial plant operating data has been collected, plant designs compared and analyses conducted on powder produced at the industrial scale. The amount of powder that becomes fines, the small size fraction of powder entrained in spray dryer outlet air streams, has been shown to be significantly greater than the traditionally vague estimate of 10 % to 20 %. The ratio of fines flows to total powder flows ranged from 49 ± 8 % to 86 ± 2 % depending on the powder type and plant operating conditions. A simple yet reliable method was developed to quantify fines flows based on measured powder size distributions of samples taken from around the plant. These estimates were supported by readings from an online optical scintillation instrument, which was shown to be capable of measuring fines flows at concentrations approximately four times the supposed maximum stated by the instrument’s manufacturer. Observations in another part of this work supported previous Fonterra observations showing that the amount of bulk fat in skim milk powder (SMP) has a large influence on the baghouse differential pressure. Fines flows measured by the optical scintillation instrument and analysis of other plant operating data showed that a change in bulk fat in SMP does not appear to cause any change in fines concentration. Observations of the surface of SMP by scanning electron microscopy, and electron spectroscopy for chemical analysis, both showed that fat is over-represented on the surface of the particles, and that only small increases in the bulk fat content are required to cause large increases in the surface fat coverage. It is hypothesised that increased fat on the surface of particles increases the clumping of SMP before deposition on the bags. Consequently, the powder forms more porous cakes and is less likely to penetrate into the interior of the filter bags, which also makes it easier to pulse clean powder from the filter bags. Therefore, the baghouse differential pressure is reduced. The design of pulse-jet baghouses from the literature was found to rely heavily on the authors past experience and approach, giving rise to large variation in recommended values of the key design parameters. A procedure for determining the optimal combination of these parameters was developed. This procedure showed that the main Fonterra washable baghouses are far from optimal because of their high air-to-cloth ratios, long bags and high elutriation and annular velocities. This procedure also showed that the Fonterra vibrating fluid bed washable baghouses are much closer to the optimum, which is the probable reason these washable baghouses have had almost no operational issues. Observations of the movement of the bags from below showed significant movement for bags near the inlet of the baghouse, indicating that this was the probable cause of the high bag damage in this zone. It is suggested that increasing the outer gap (distance between the baghouse wall and the bag on the edge of the bag bundle) be investigated further in an attempt to slow the annular velocity around the edge of the bag bundle and reduce bag movement. It is also recommended that stainless steel inspection hatches installed in the wall of a baghouse for this research, be included in all current and future washable baghouses because use of these hatches reduced the overall clean-in-place turn around time by 20 %. Computational fluid dynamics simulations of the air flow patterns within the Clandeboye Dryer 2 chamber were carried out using a commercial code CFX10.0. These simulations are possibly the first to include the influence of a spray dryer’s internal fluid bed airflow on the flow patterns within a spray dryer. As expected, the simulations showed the main air jet oscillated and precessed about the central axis with no apparent distinct frequency. In turn, the recirculation zones between the main jet and the chamber walls fluctuated in size. Different fluid bed flows within the industrial range had only a local influence on the air only flow field by reducing the length of the main jet. A different outlet boundary condition (including a flow resistance representing the baghouse) also appeared to have little influence on the overall flow field. Good agreement was found between the movements of the main jet via simulations and from telltale tufts installed in the plant dryer. This supported other indications that the simulations were an accurate representation of the actual flows. It was concluded that this project achieved its main aim of improving the fundamental understanding of washable baghouse operation and design, especially for application in milk powder plants. Also this project, as well as a change in production schedules, has helped to reduce downtime associated with the washable baghouses in the Fonterra Clandeboye Dryer 2 plant by an estimated 50 hours per annum.
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4

Marquié, Sandrine. "Production et circulation des céramiques fines d'époques hellénistique et romaine en Méditerranée : le cas des sigillées découvertes à Kition (Chypre)." Lyon 2, 2003. http://theses.univ-lyon2.fr/documents/lyon2/2003/marquie_s.

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La sigillée est la céramique de table d'époque romaine par excellence. Son processus de fabrication et les mécanismes de sa commercialisation sont relativement bien connus en Méditerranée occidentale, mais il n'en est pas de même pour la Méditerranée orientale. Chypre offre un cadre particulièrement favorable pour aborder cette problématique puisqu'elle a connu dans l'Antiquité, une forte tradition de potiers. Ceux-ci ont notamment produit du début du Ier s. Av. Notre ère jusqu'à la fin du IIe s. De notre ère une production de "Cypriot sigillita", puis une autre à l'époque proto-byzantine ("Cypriot red slip ware"). En outre, la situation géographique de l'île, située à un carrefour de grands axes commerciaux, explique la présence de nombreuses importations occidentales (sigillée italique) et orientales ("Eastern sigillita" A, B et dans une moindre mesure C). Grâce au matériel inédit provenant du site de Kition, il a été possible de mettre en évidence le rôle de relais que Chypre avait joué dans la redistribution de ces céramiques, et de s'interroger sur les facteurs historiques responsables de leur déclin.
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Marquié, Sandrine Yon Marguerite. "Production et circulation des céramiques fines d'époques hellénistique et romaine en Méditerranée le cas des sigillées découvertes à Kition (Chypre) /." Lyon : Université Lumière Lyon 2, 2003. http://demeter.univ-lyon2.fr/sdx/theses/lyon2/2003/marquie_s.

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6

Elaigne, Sandrine Empereur Jean-Yves. "La mobilité des produits et des techniques céramiques en Méditerranée orientale du IIe siècle avant J.-C. à l'époque claudienne le cas des céramiques fines d'après les contextes d'habitat d'Alexandrie (Egypte) /." Lyon : Université Lumière Lyon 2, 2002. http://theses.univ-lyon2.fr/sdx/theses/lyon2/2002/elaigne_s_notice.

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7

Osong, Sinke Henshaw. "Mechanical Pulp Based Nano-ligno-cellulose : Production, Characterisation and their Effect on Paper Properties." Licentiate thesis, Mittuniversitetet, Avdelningen för kemiteknik, 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:miun:diva-21555.

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Almost all research on biorefinery concepts are based on chemical pulping processes and ways of utilising lignin, hemicelluloses and extractives as well as a part of the remaining cellulose for production of nano materials in order to create more valuable products than today. Within the Forest as a Resource (FORE) research program at FSCN we are utilising the whole chain of unit processes from forestry to final products as paper and board, where the pulping process research focus on high yield process as TMP and CTMP. As these process solutions are preserving or only slightly changing the properties of the original wood polymers and extractives, the idea is to find high value adding products designed by nature. From an economic perspective, the production of nanocellulose from a chemical pulp is quite expensive as the pulp has to be either enzymatically (e.g. mono-component endoglucanase) pre-treated or chemically oxidised using the TEMPO (2,2,6,6 - tetramethyl-piperidine-1-oxil) - mediated oxidation method in order to make it possible to disrupt the fibres by means of homogenisation. In high yield pulping processes such as in TMP and CTMP, the idea with this study was to investigate the possibility to use fractions of low quality materials from fines fractions for the production of nano-ligno-cellulose (NLC). The integration of a NLC unit process in a high yield pulping production line has a potential to become a future way to improve the quality level of traditional products such as paper and board grades. The intention of this research work was that, by using this concept, a knowledge base can be created so that it becomes possible to develop a low-cost production method for its implementation. In order to study the potential of this concept, treatment of thermo-mechanical pulp (TMP) fines fractions were studied by means of homogenisation It seems possible to homogenise fine particles of thermo-mechanical pulp (1% w/v) to NLC. A correspond fines fraction from bleached kraft pulp (BKP) was tested as a reference at 0.5% w/v concentration. The objective presented in this work was to develop a methodology for producing mechanical pulp based NLC from fines fractions and to utilise this material as strength additives in paper and board grades. Laboratory sheets of CTMP and BKP, with addition of their respective NLC, were made in a Rapid Köthen sheet former. It was found that handsheets of pulp fibres blended with NLC improved the z-strength and other important mechanical properties for similar sheet densities. The characterisation of the particle size distribution of NLC is both important and challenging and the crill methodology developed at Innventia (former STFI) already during the 1980s was tested to see if it would be both fast and reliable enough. The crill measurement technique is based on the optical responses of a micro/nano particle suspension at two wavelengths of light; UV and IR. The crill value of TMP and CTMP based nano-ligno-cellulose were measured as a function of the homogenisation time. Results showed that the crill value of both TMP-NLC and CTMP-NLC correlated with the homogenisation time.
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8

Altinalmazis, kondylis Andreas. "Tree diversity effects on root production, decomposition and nutrient cycling under global change." Thesis, Bordeaux, 2021. http://www.theses.fr/2021BORD0067.

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Анотація:
L'hypothèse de l'assurance prévoit que les forêts composées de mélanges d'espèces d'arbres pourraient mieux résister aux conditions environnementales stressantes que les forêts composées d'une seule espèce d'arbre. La majorité des travaux antérieurs ont testé cette hypothèse en se focalisant sur la productivité et les variables de réponse associées sans prendre en compte les processus souterrains. L’objectif principal de ma thèse était d’étudier l’effet de la diversité des espèces d’arbres sur les processus souterrains impliqués dans la décomposition des racines à travers des gradients climatiques. J'ai émis l'hypothèse que le mélange d'espèces ayant des systèmes racinaires contrastés entraînerait une faible compétition souterraine, et se traduirait par la production de plus biomasse de racines fines. En outre, j'ai émis l'hypothèse que les racines ayant des caractéristiques chimiques et morphologiques contrastées dans les peuplements mixtes se décomposent plus rapidement. Dans des conditions de stress hydrique, j'ai émis l'hypothèse d'une décomposition plus lente mais d’une atténuation des mélanges d'arbres sur la décomposition en raison de l'amélioration des conditions micro-environnementales. Pour tester ces hypothèses, j'ai examiné la variation des caractéristiques fonctionnelles des racines et leurs conséquences sur les flux de C, N et P à l'échelle de l'écosystème à travers l’étude de : 1) la ségrégation verticale des racines et la biomasse des racines fines, 2) la dynamique des racines fines et les flux de nutriments associés et 3) la décomposition des racines fines et des feuilles mortes. Dans ce cadre, trois deux expériences de terrain ont été réalisé, l'une avec une expérience de plantation d'arbres de 10 ans avec du bouleau et du pin près de Bordeaux (expérience ORPHEE), la seconde le long d'un gradient latitudinal de forêts de hêtres matures dans les Alpes françaises (expérience BIOPROFOR).Les résultats obtenus montrent que les racines de bouleaux et de pins présentaient une distribution verticale similaire et une biomasse souterraine similaire de racines dans les mélanges d'arbres par rapport aux monocultures, contrairement à ma première hypothèse. Cependant, l'attribution plus importante du pin mais pas du bouleau à la croissance des racines dans les horizons du sol supérieur dans des conditions moins limitatives en eau suggère des conditions localement favorables qui peuvent conduire à une compétition asymétrique à la profondeur du sol. De plus, la production et la décomposition des racines fines étaient similaires dans les mélanges et dans les monocultures, en contradiction avec ma deuxième hypothèse. Il est intéressant de noter que les racines de bouleau, mais pas les racines de pin, ont libéré du P pendant leur décomposition, ce qui suggère un rôle important du bouleau dans le cycle du P et pour la nutrition en P des arbres sur ces sols sableux limités en P. Conformément à ma troisième hypothèse, j'ai observé une décomposition plus lente de la litière de feuilles et des racines fines en réponse à une sécheresse estivale prolongée, tout au long du gradient latitudinal dans les Alpes. Cependant, cette décomposition plus lente sous la sécheresse n'a pas été atténuée dans les peuplements forestiers à essences mixtes par rapport aux peuplements à essences uniques. Il est intéressant de noter qu’il y a une libération nette d'azote dans les racines fines en décomposition mais pas dans la litière de feuilles en décomposition, ce qui suggère un rôle distinct des racines fines dans le cycle de l'azote. En conclusion, j'ai constaté que le mélange des espèces d'arbres n'atténue pas les effets négatifs du changement climatique. Cette thèse démontre que la promotion de mélanges peut toujours être bénéfique pour au moins une des espèces d'arbres mélangées, par l'ajout d'espèces, car une espèce d'arbre peut en faciliter la nutrition minérale d’une autre par des flux souterrains de N et de P
The insurance hypothesis predicts that forests with tree species mixtures may resist better to stressful environmental conditions than forests composed of only one tree species. Most of the currently available literature tested this hypothesis for aboveground productivity and its related response variables, but less is known about belowground processes. In my PhD thesis, I studied the drivers of belowground productivity and decomposition across climatic gradients and how they are affected by tree mixtures. I hypothesized that mixing of tree species with contrasting rooting patterns and fine root morphologies, would result in a release of competitive pressure belowground, and translate into higher fine root standing biomass and increased fine root productivity. Moreover, I hypothesized that roots with contrasting chemical and morphological characteristics in mixed stands would decompose faster, which may be particularly important under nutrient-limited conditions. Under water-limiting conditions, such as during extreme summer drought, I hypothesized overall slower decomposition but an attenuating effect of tree mixtures on decomposition due to improved micro-environmental conditions, in particular for leaves, since roots decompose in a more buffered soil environment. To test these hypotheses I examined the variation in tree root functional traits (across- and within-species), and its consequences for fluxes of C, N and P at the ecosystem scale. I addressed three main objectives and associated research questions to quantify the interactive effect of tree mixtures and climate on: 1) vertical root segregation and fine root standing biomass, 2) fine root dynamics and their associated nutrient fluxes and 3) fine root- and leaf litter decomposition. I could benefit from two different field experiments for my work, one with a 10-year-old tree-plantation experiment with birch and pine close to Bordeaux (ORPHEE experiment), the second along a latitudinal gradient of mature beech forests in the French Alps (BIOPROFOR experiment).I observed that roots from the birch and pine tree-plantation showed similar vertical distribution and similar belowground root standing biomass in tree mixtures compared to monocultures, contrary to my first hypothesis. However, the greater allocation of pine but not of birch to root growth within the top soil horizons under less water-limiting conditions suggests locally favourable conditions that may lead to soil depth-specific asymmetric competition. In the same experiment, fine root production and decomposition were similar in mixtures and in monocultures, in contradiction with my second hypothesis. Moreover, I did not observe any interactive effects of tree mixtures with stand density or water availability. Interestingly though, birch roots, but not pine roots released P during root decomposition, which suggests an important role of birch in the P-cycle and for P nutrition of trees on these P-limited sandy soils. In line with my third hypothesis, I observed a slower decomposition of leaf litter and fine roots in response to reinforced and prolonged summer drought, irrespective of the position along the latitudinal gradient in the Alps. However, this slower decomposition under drought was not attenuated in forest stands with mixed tree species compared to single species stands. Compared to leaf litter, fine roots decomposed slower and released less C. Interestingly, I found a net N release in decomposing fine roots but not in decomposing leaf litter, which suggests a distinct role of fine roots in the N cycle. In conclusion, I found that mixing tree species did not attenuate negative effects of climate change. However, this thesis demonstrates that promoting mixtures can still be beneficial for at least one of the admixed tree species, through species addition (i.e., complementing one tree species with another tree species), as one tree species may facilitate another via belowground fluxes of N and P
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Élaigne, Sandrine. "La mobilité des produits et des techniques céramiques en Méditerranée orientale du IIe siècle avant J. -C. à l'époque claudienne : le cas des céramiques fines d'après les contextes d'habitat d'Alexandrie (Egypte)." Lyon 2, 2002. http://theses.univ-lyon2.fr/sdx/theses/lyon2/2002/elaigne_s_notice.

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Alexandrie, en tant que site de consommation antique, recevait des céramiques de provenances diverses mais dont les ateliers de production avaient acquis un degré d'organisation et un développement suffisants pour procéder à une diffusion à longue distance. Cette étude prend en compte plusieurs facteurs de connaissance des ensembles de céramiques issus des fouilles archéologiques du centre ville d'Alexandrie actuelle pour évaluer les importations (quantité, identité technique et identité culturelle, approche du commerce) en regard des fabrications locales. L'étude céramologique proprement dite a permis de déterminer les fabriques (ou ateliers) céramiques importées à Alexandrie et de connaître l'évolution de leur représentativité. Parallèlement, des analyses chimiques d'un échantillon des productions de certaines de ces fabriques ont permis d'identifier leur origine géographique. Cette démarche nous a conduit à faire le point sur les liens commerciaux entre Alexandrie et le reste de la Méditerranée : en précisant, d'un point de vue chronologique, l'apport, en terme de quantité et de qualité (degré technologique mis en œuvre), de chacun des centres producteurs qui exportent à longue distance. Dans un second temps, l'objectif a été de retracer l'évolution des productions d'un point de vue technologique et culturel et de confronter les données avec les facteurs économiques, notamment le fonctionnement du commerce. Enfin, on a cherché à appréhender les facteurs d'évolution de la production qu'ils soient culturels (évolution des formes de vases, adaptation, rejet) ou technologiques (revêtements noirs, revêtements rouges, absence de revêtement) de production. L'étude de ces ensembles céramiques s'est enfin appuyée sur des confrontations avec des faciès céramiques d'autres régions méditerranéennes aux mêmes époques afin de déterminer les caractères propres à la céramique fine d'Alexandrie tout en prenant soin de replacer ceux-ci dans leur contexte historique
In Alexandria, which was an important trade center in Antiquity, table ware were imported from many places. These wares came from workshops whose development and high level of organization allowed a large scale trading. Although the pottery workshops were numerous, those trading on a large scale were much fewer. This study deals with technical and cultural identity, quantity and provenance of fine wares found in Alexandria for approaching the question of trade. We also tried to assess at the part of the importations and the part of the local productions. The technical groups of production (called fabrics) and their respective quantity depending on the chronology were determined. A sample of sherds of some of the fabrics have been studied by chemical analysis aiming to find out the geographical provenience of these fabrics. All these investigations led us to precise our knowledge about the trading connections between Alexandria and the other Mediterranean lands. We also got new chronological indications concerning the quantity and the quality (technological level of the production) of each workshop producing and exportating pottery. We also tried to give a picture of the evolution of the production according to technological (black-glazed ware, red-glazed ware, ware without glaze) and cultural (evolution of shape, copy, disappearance, adaptation of shape) features and to compare these data with the trade mecanisms. Then, the Alexandrian series of fine pottery have been compared with other series from Mediterranean sites at the same period to determine Alexandrian specificities
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Casanova, Michèle. "Le lapis-lazuli dans l'Orient ancien : gisements, production, circulation, des origines au début du second millénaire avant J.-C." Paris 1, 1998. http://www.theses.fr/1998PA010566.

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Le lapis-lazuli fut la véritable pierre précieuse de l'orient ancien, signifiant symbolique essentiel du Proche-Orient et de l'Égypte, sa possession était un gage de puissance politique et religieuse. Son histoire, entamée dès le néolithique (au 7e millénaire), se prolonge à l’âge du bronze jusqu'au 2e millénaire av. J. -C. Et au-delà. Il est attesté sur des sites distants de plus de 3000 km, de l’Asie centrale à la Mésopotamie, et de la Syrie à l'Égypte. C'est une roche rare et difficile à se procurer car originaire de très hautes montagnes à l'accès restreint par les conditions naturelles. Le lapis-lazuli travaille dans l'orient ancien provenait des mines du Badakhshan (Afghanistan), du Gorno- Badakhshan au Pamir (Tadjikistan) et peut-être des monts de Chaghaï (Pakistan). Le lapis-lazuli connait son plus grand usage au milieu du 3e millénaire, les fabuleuses richesses des tombes du cimetière royal d'Ur en témoignent. L'étude des vestiges de fabrication et des outils indique l'existence d'une chaine commune de séquences opératoires pour la production des parures en lapis-lazuli. Des styles régionaux se sont différenciés selon qu'il s'agit de parures d'Égypte, de syro-Mésopotamie et de Susiane, ou bien d’Iran (hors l'Elam) ou encore d'Asie centrale. Les cités-états hiérarchisées de Syro-Mésopotamie étaient de grosses consommatrices de biens symboliques qui servaient aussi leur propagande. Les artisans travaillaient dans le cadre d'ateliers dépendants du palais ou des temples. L'épopée de Gilgamesh nous montre les dieux équiper de lapis-lazuli les êtres qu'ils veulent favoriser ou munir de protections avant l'entrée dans l'enfer. Le lapis-lazuli symbolise la force de vie qui est à la source de la puissance des dieux. Il est agent, signe et manifestation de la circulation de biens, d'idées et de représentations culturelles mais aussi des rapports d'influence, de domination et d'échanges entre les centres de civilisation du Proche-Orient du 4e au 2e millénaires av. J. -C
Lapis lazuli is considered as the real precious gem in the ancient near east, it was the most highly prized symbolic goods and being in possession of it was a gage of political and religious power. It is during the neolithic period 7th millennium bc) that its history begins; it goes on until the 2d millennium bc and beyond. The stone is found on sites which are more than 3000 km away from each other from central asia to mesopotamia, and from syria to egypt. This gem is scarce and very difficult to get because deposits are located in very high mountains with means of access limited by natural conditions. Lapis lazuli worked in ancient eastern came from Badakhshan deposits (Afghanistan), Gorno- Badakhshan in Pamir mountains (Tadjikistan) and perhaps from chaghai hills (Pakistan). Lapis lazuli use reached its zenith during the 3rd millennium; it is testified by the fabulous treasures of the graves excavated in the royal cemetery at ur. The study of beadmaking remains and tools reveals the existence of a common process of working phases to produce lapis lazuli jewellery. Regional styles appeared between ornaments from egypt, syria, mesopotamia and susiana, or iran (except elam) or even central asia. The state cities organised in hierarchy from syria and mesopotamia were great consumers of symbolic goods, which were usefil to their propaganda. Craftsmen worked in workshops that depended on palaces or temples, the gilgamesh epic tell us gods equipped with lapis lazuli the beings they wanted to favour or give protection to before entering hell. Lapis lazuli symbolises vital energy which is the origin of deity power. It is not only agent, sign and expression of the circulation of goods, of ideas and cultural representations but also of influence, domination and exchange relations between the near east civilisation centres from 4th till 2d millennia BC
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Книги з теми "Fines production"

1

United States. Congress. House. Committee on Agriculture. Providing equitable treatment to producers of sugarcane subject to proportionate shares: Report (to accompany H.R. 5763). [Washington, D.C.?: U.S. G.P.O., 1992.

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Potts, Donald F. Estimating postfire water production in the Pacific Northwest. Berkeley, Calif. (P.O. Box 245, Berkeley 94701): U.S. Dept. of Agriculture, Forest Service, Pacific Southwest Forest and Range Experiment Station, 1989.

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Potts, Donald F. Estimating postfire water production in the Pacific Northwest. Berkeley, Calif. (P.O. Box 245, Berkeley 94701): U.S. Dept. of Agriculture, Forest Service, Pacific Southwest Forest and Range Experiment Station, 1989.

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Phillips, Clinton B. Bulldozer fireline production rates: 1988 update. Ogden, UT: U.S. Dept. of Agriculture, Forest Service, Intermountain Research Station, 1988.

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Phillips, Clinton B. Bulldozer fireline production rates: 1988 update. [Ogden, Utah]: U.S. Dept. of Agriculture, Forest Service, Intermountain Forest and Range Experiment Station, 1988.

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Phillips, Clinton B. Bulldozer fireline production rates: 1988 update. Ogden, UT: U.S. Dept. of Agriculture, Forest Service, Intermountain Research Station, 1988.

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Institute, British Film, ed. "Fires were started--". London: BFI, 1999.

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8

Hurwitz, Matt. The complete X-files: Behind the series, the myths, and the movies. San Rafael, CA: Insight Editions, 2008.

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9

Their finest hour and a half. Oxford: ISIS, 2009.

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10

Evans, Lissa. Their Finest Hour And A Half. London: Transworld, 2009.

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Частини книг з теми "Fines production"

1

Stribling, Zachary, and John Holloway. "Digital Audio Files." In Illustrated Theatre Production Guide, 390–400. Fourth edition. | New York, NY : Routledge, 2021.: Routledge, 2020. http://dx.doi.org/10.4324/9781003034575-36.

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Gey, Christoph. "Fine Finishing of Holes." In CIRP Encyclopedia of Production Engineering, 1–4. Berlin, Heidelberg: Springer Berlin Heidelberg, 2018. http://dx.doi.org/10.1007/978-3-642-35950-7_6404-4.

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Gey, Christoph. "Fine Finishing of Holes." In CIRP Encyclopedia of Production Engineering, 660–64. Berlin, Heidelberg: Springer Berlin Heidelberg, 2019. http://dx.doi.org/10.1007/978-3-662-53120-4_6404.

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Gey, Christoph. "Fine Finishing of Holes." In CIRP Encyclopedia of Production Engineering, 504–7. Berlin, Heidelberg: Springer Berlin Heidelberg, 2014. http://dx.doi.org/10.1007/978-3-642-20617-7_6404.

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5

Sanches, Alexandre Milkiewicz, Lourival José de Souza, Sergio E. Gouvea da Costa, and Edson Pinheiro de Lima. "Risks of Contractual Fines for Failures in the Industrial Production Process and the Relation with the Importance of the Qualification of the Work in the Maintenance." In Proceedings on 25th International Joint Conference on Industrial Engineering and Operations Management – IJCIEOM, 154–62. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-43616-2_17.

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Neubert, E. A. "Calcination and pyroprocessing of mineral fines." In Production and Processing of Fine Particles, 735–49. Elsevier, 1988. http://dx.doi.org/10.1016/b978-0-08-036448-3.50077-3.

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Burt, R. O. "A review of gravity concentration techniques for processing fines." In Production and Processing of Fine Particles, 375–85. Elsevier, 1988. http://dx.doi.org/10.1016/b978-0-08-036448-3.50043-8.

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8

Moser, P. "Less fines production in aggregate and industrial minerals industry." In Explosives and Blasting Technique, 335–43. Taylor & Francis, 2003. http://dx.doi.org/10.1201/9781439833476.ch40.

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Oliveira, J. F., and J. A. Sampaio. "Development studies for the recovery of Brazilian scheelite fines by froth flotation." In Production and Processing of Fine Particles, 209–17. Elsevier, 1988. http://dx.doi.org/10.1016/b978-0-08-036448-3.50027-x.

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Kumar Samal, Sumant, Manoja Kumar Mohanty, Subash Chandra Mishra, and Bhagiratha Mishra. "Plasma Processing of Iron Ore." In Iron Ores [Working Title]. IntechOpen, 2020. http://dx.doi.org/10.5772/intechopen.94050.

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The depletion of high-grade ore minerals and the scarcity of fossil fuel reserves are challenging factors for metallurgical industries in the future. Also, extensive mining for increased steel demand results in the generation of fines often found unsuitable for use as direct feedstock for the production of metals and alloys. Apart from mines waste, the other major sources of fine minerals are leftover in charge burdens, sludges, and dust generated in the high-temperature process. Sludge and fines generated during beneficiation of ore add to this woe, as the outcomes of beneficiation plants for lean ores show better yield for fine particles. The utilization of lean ore and wastes in iron making requires wide research and adopting new advanced technologies for quality production with time-saving operations. The application of thermal plasma in mineral processing has several advantages that can overcome the current industrial metal extraction barriers. The present study demonstrates the thermal plasma for the processing of different iron-bearing minerals and its feasibility for metal extraction.
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Тези доповідей конференцій з теми "Fines production"

1

Ohen, H. A., and F. Civan. "Predicting Skin Effects Due to Formation Damage by Fines Migration." In SPE Production Operations Symposium. Society of Petroleum Engineers, 1991. http://dx.doi.org/10.2118/21675-ms.

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Civan, F., and R. M. Knapp. "Effect of Clay Swelling and Fines Migration on Formation Permeability." In SPE Production Operations Symposium. Society of Petroleum Engineers, 1987. http://dx.doi.org/10.2118/16235-ms.

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Stanley, F. O., S. A. Ali, and J. L. Boles. "Laboratory and Field Evaluation of Organosilane as a Formation Fines Stabilizer." In SPE Production Operations Symposium. Society of Petroleum Engineers, 1995. http://dx.doi.org/10.2118/29530-ms.

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Miranda, R. M., and D. R. Underdown. "Laboratory Measurement of Critical Rate: A Novel Approach for Quantifying Fines Migration Problems." In SPE Production Operations Symposium. Society of Petroleum Engineers, 1993. http://dx.doi.org/10.2118/25432-ms.

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Hashemi, Abolfazl, Sara Borazjani, Cuong Nguyen, Grace Loi, Alexander Badalyan, Bryant Dang-Le, and Pavel Bedrikovetsky. "Fines Migration and Production in CSG Reservoirs: Laboratory & Modelling Study." In SPE Asia Pacific Oil & Gas Conference and Exhibition. SPE, 2022. http://dx.doi.org/10.2118/210764-ms.

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Abstract Fines detachment is an important component of methane production from Coal Bed Methane reservoirs. Production of coal fines is widely observed during dewatering and simultaneous gas-water production. The theory for fines detachment by drag against electrostatic attraction, model of the transport of those detrital fines, and their validation by laboratory test is widely used for planning and design of Coal Seam Gas developments. However, clay particles that naturally grow on coal grains and asperous parts of coal surfaces (authigenic and potential coal fines) are detached by breakage. To the best of our knowledge, the analytical theory for detachment of authigenic and potential coal fines is not available. The present paper fills the gap. Based on Timoshenko's beam theory, we derive failure conditions for breakage of authigenic and potential coal fines of the rock surface. It allows defining maximum retention function for fines breakage. The maximum retention is incorporated into transport equation of mobilized fines, allowing developing analytical models for linear flow of core flooding and radial flow of well inflow performance. Matching of laboratory coreflood data from four laboratory studies show high agreement. The model coefficients obtained by treatment of laboratory data allow predicting skin growth in production wells under fines migration.
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Dornelas, Paulo, Alfredo Carlos Bitarães Quintas, Victor Eric de Souza Moreira, Natalia Haneiko, Mauro Silva, CARLOS FERREIRA, and Guilherme Liziero Ruggio da Silva. "CHARCOAL FINES AS AN ADDITIVE IN METALLURGICAL COKE PRODUCTION." In Congresso Brasileiro de Engenharia de Fabricação. ABCM, 2017. http://dx.doi.org/10.26678/abcm.cobef2017.cof2017-0948.

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Jenkinson*, Les, Thomas Flottmann, and Mark Tingay. "Fines Production in the Walloon Subgroup, Surat Basin Queensland." In International Conference and Exhibition, Melbourne, Australia 13-16 September 2015. Society of Exploration Geophysicists and American Association of Petroleum Geologists, 2015. http://dx.doi.org/10.1190/ice2015-2211510.

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8

Bedrikovetsky, Pavel G., Alexandre Vaz, Fernando A. Machado, Abbas Zeinijahromi, and Sara Borazjani. "Productivity Impairment Due to Fines Migration: Steady State Production Regime." In Brasil Offshore. Society of Petroleum Engineers, 2011. http://dx.doi.org/10.2118/143744-ms.

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Chen, Mingjun, Jiaxin Shao, Lijun You, Yili Kang, Seng Meng, and Guang Yang. "Fines Migration Behavior During Cyclic Injection and Production of Underground Gas Storage Wells." In International Petroleum Technology Conference. IPTC, 2021. http://dx.doi.org/10.2523/iptc-21353-ms.

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Abstract Different injection and production pressure modes for underground gas storage have great differences on the permeability of formation rocks. In this paper, core flow experiments are designed and carried out to simulate the real pressure gradient of the injection and production in underground gas storage, and these experiments are carried out under in-situ stress conditions. The permeability and turbidity of core outlet were monitored during the experiment. The experimental results show that under different injection-production pressure modes, the permeability changes and the turbidity at the core outlet changes. It was observed by scanning electron microscope that there were fines on the fracture wall after the experiment. Analysis shows that fine migration is the main reason for the change of permeability under different injection-production pressure modes.
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Rahman, M. S., S. S. Rahman, and Aziz Arshad. "Control of Fines Migration: A Key Problem in Petroleum Production Industry." In SPE Formation Damage Control Symposium. Society of Petroleum Engineers, 1994. http://dx.doi.org/10.2118/27362-ms.

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Звіти організацій з теми "Fines production"

1

Craig N. Eatough. Clean Production of Coke from Carbonaceous Fines. Office of Scientific and Technical Information (OSTI), November 2004. http://dx.doi.org/10.2172/1012550.

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Rapp, D., and J. Lytle. Production of a pellet fuel from Illinois coal fines. Technical report, March 1--May 31, 1995. Office of Scientific and Technical Information (OSTI), December 1995. http://dx.doi.org/10.2172/205929.

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Rapp, D., J. Lytle, and R. Berger. Production of a pellet fuel from Illinois coal fines. Technical report, September 1--November 30, 1994. Office of Scientific and Technical Information (OSTI), December 1994. http://dx.doi.org/10.2172/28252.

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Craig N. Eatough. Clean production of coke from waste carbonaceous fines. Quarterly report for the period July - September 1999. Office of Scientific and Technical Information (OSTI), October 1999. http://dx.doi.org/10.2172/763186.

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Pitts, William M. Carbon monoxide production in compartment fires:. Gaithersburg, MD: National Institute of Standards and Technology, 1994. http://dx.doi.org/10.6028/nist.ir.5568.

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Raitzer, David A., and Odbayar Batmunkh. Impact Evaluation of Support to Collective Action for Agricultural Value Chain Development in Nepal. Asian Development Bank, June 2022. http://dx.doi.org/10.22617/wps220137-2.

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Анотація:
This study examines different forms of support for smallholders provided through farmers’ groups and cooperatives in Nepal. It finds that multidimensional support involving productive assets and training is especially effective. The results indicate that support for marketing is another particularly effective form of support. Of individual support elements, the study finds that training has the most substantial and significant effects and is crucial to the effectiveness of other measures. More focus on training and less on inputs alone would increase the impact of support for smallholders.
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Newsham, Andrew, Toendepi Shonhe, and Tsitsidzashe Bvute. Commercial Tobacco Production and Climate Change Adaptation in Mazowe, Zimbabwe. Institute of Development Studies (IDS), September 2021. http://dx.doi.org/10.19088/apra.2021.023.

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Анотація:
There has been an increasingly well-documented, rapid rise in tobacco production over the last couple of decades in Mazowe, Zimbabwe, despite growing public health concerns about lung cancer and nicotine’s addictive capacities in the wealthier countries of the West – even affecting the South African market. This has been accompanied by a shift away from its production almost completely on large-scale farms towards predominantly small-scale farms. To date, less consideration has been given to the implications of climate change for tobacco production. Given the hopes that it can make a serious contribution to poverty reduction and food security, it is of increasing importance to understand these implications, to identify the most relevant and/or effective adaptation options and to assess the viability of their successful adoption. This paper presents a fine-grained, qualitative bottom-up analysis of the implications for commercial tobacco production of climate change impacts in Zimbabwe.
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Dubey, Manvendra. Climate Forcing & Feedbacks by Fires, Forests, Fossil Energy & Food Production: Observations are Key to Predictions. Office of Scientific and Technical Information (OSTI), August 2022. http://dx.doi.org/10.2172/1884732.

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Roy Crooks, Ph D. ,. P. E. Production of Seamless Superconducting Radio Frequency Cavities from Ultra-fine Grained Niobium, Phase II Final Report. Office of Scientific and Technical Information (OSTI), October 2009. http://dx.doi.org/10.2172/967061.

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Aparicio, Gabriela, Vida Bobić, Fernando De Olloqui, María Carmen Fernández Diez, María Paula Gerardino, Oscar A. Mitnik, and Sebastian Vargas Macedo. Liquidity or Capital?: The Impacts of Easing Credit Constraints in Rural Mexico. Inter-American Development Bank, June 2021. http://dx.doi.org/10.18235/0003336.

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This paper evaluates the effectiveness of easing credit constraints for rural producers in Mexico through loans provided by a national public development finance institution. In contrast to most of the existing literature, the study focuses on the effect of medium-sized loans over a two- to four-year time horizon. This paper looks at the effects of such loans on production and investment decisions, input use, and yields. Using a multiple treatment methodology, it explores the differential impacts of providing liquidity for working capital versus providing credit for investments in fixed assets. It finds that loans increased the likelihood that producers grow and sell certain key annual crops, in particular among recipients of working capital loans. It also finds significant effects on production value and sales (per hectare), with similar impacts for recipients of both types of loans, with gains in yields driven by changes in labor quality and more intensive use of key inputs. There is no evidence of significant effects on the purchase of large machinery, but there are impacts on the acquisition of cattle. Overall, the results reported in this paper suggest that lack of liquidity is at least as important as lack of funding for new investment in capital for rural producers in Mexico. Producers benefit from easing their credit constraints, regardless of the type of loan used for that purpose.
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