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Littérature scientifique sur le sujet « Porou »

Auteur : Grafiati

Publié le 9 mars 2023

Mis à jour le 10 mars 2023

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Articles de revues sur le sujet "Porou"

Robertson, Natalie. « Swirling currents emerge at the Waiapu river mouth : Lens-based witnessing, documenting and storytelling of slow catastrophes ». Journal of Environmental Media 2, n^o 1 (1 novembre 2021) : 6.1–6.16. http://dx.doi.org/10.1386/jem_00054_1.

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This article considers how Indigenous stories and chants can tell us about our ecologies in the time of environmental emergencies. For Ngāti Porou of the lower reaches of the Waiapu river catchment in Te Ika-a-Māui, the North Island of Aotearoa (New Zealand), the slow catastrophes of twentieth-century colonial deforestation impacts, introduced pest-induced inland forest collapse and predicted twenty-first-century climate change sea level rise have converged as our most pressing environmental problems. Waiapu is home to Ngāti Porou Tūturu, coastal fishing people who value their relationships with fish species, notably kahawai. The mōteatea chant form acts as a guide to my photographic and moving image practice to visualize and voice the slow catastrophe of the river. In this article, I discuss how the Ngāti Porou mōteatea He Tangi mo Pāhoe, which reveals nineteenth-century ecological knowledge, particularly of fish species, is reimagined as a moving image visual mōteatea. Through reframing the threats as the current faces of our ancestors, this article proposes a shift in thinking from vulnerability into resilience.

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Brewin, Marilyn, et Carolyn Coggan. « Evaluation of the Ngati Porou community injury prevention project ». Ethnicity & ; Health 9, n^o 1 (février 2004) : 5–15. http://dx.doi.org/10.1080/1355785042000202754.

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Rasulov, A., et U. Dalabaev. « Flow in a channel with porous insert ». IOP Conference Series : Earth and Environmental Science 990, n^o 1 (1 février 2022) : 012027. http://dx.doi.org/10.1088/1755-1315/990/1/012027.

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Abstract Filtration of an incompressible liquid (gas) in a non-deformable porou s medium is investigated. The results of numerical simulation of the hydrodynamic features of the flow arising after the passage of the liquid through a layer of an immobile porous medium are presented. An interpenetrating model of multiphase media is used to describe such flows. The porosity and permeability of the porous medium, as well as the force of interfacial interaction, are considered in the framework of compliance with the Kozeny-Karman ratio. The influence of the geometrical shape of the bulk layer on the nature and magnitude of the inhomogeneity of the flow velocity behind the obstacle is shown. Considering the shape of the porous medium significantly affects the flow parameters. Numerical simulation results are compared with experimental data. The effects of the non-uniformity of the fluid velocity field arising from the curvature of the layer surface and the influence of the arising inhomogeneity on the velocity are investigated by the methods of a computational experiment. A qualitative comparison is made of velocity inhomogeneities when a fluid flows through a porous obstacle. For the numerical implementation of the filtration equation of the interpenetrating model, a SIMPLElike algorithm was used.

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Defngin, Axel. « A Whakapapa of Tradition : 100 Years of Ngāti Porou Carving, 1830–1930 by Ngarino Ellis ». Contemporary Pacific 34, n^o 1 (2022) : 236–38. http://dx.doi.org/10.1353/cp.2022.0018.

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Robertson, Natalie. « Roimata Toroa ». Pacific Journalism Monographs : Te Koakoa : Ngā Rangahau, n^o 7 (30 novembre 2017) : 8–9. http://dx.doi.org/10.24135/pjm.v0i7.16.

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I n Te Ao Mãori, the Toroa (albatross) is sacred. Roimata Toroa, albatross tears, is a widely used tukutuku pattern. Derived from the Te Tairawhiti Ngati Porou story of Pourangahua, the pattern speaks of themisadventures of travelers who take shortcuts in haste to get to port. Pourangahua was an agriculturist who traveling a return journey to Aotearoa to grow kumara, gifted to him by Ruakapenga, a tohunga and learned scientist. Lent two pet albatrosses, Harongarangi and Tiungarangi, by Ruakapenga, Pourangahua is given strict instructions on which hazards to avoid, the care of the birds, and a karakia to give thanksgiving for their safe return. In his hurriedness to see his wife Kaniowai, Pourangahua takes a shortcut, runs into a taniwha (a denotation of hazards), and forgets the karakia and fails to care for the birds,leading to their grief and eventual demise. Realising he has dishonoured Ruakapenga, Pourangahua tries to cover his mistake, by belatedly doing the karakia, but it is too late. The damage was done...

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Puke, Wiremu T. « Conception, construction and the cultural significance of Te Parapara Garden in Hamilton, Aotearoa New Zealand ». Journal of New Zealand & ; Pacific Studies 9, n^o 2 (1 décembre 2021) : 179–98. http://dx.doi.org/10.1386/nzps_00071_1.

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Te Parapara Garden is the only complete pre-European-style Māori horticultural garden in the world. Historically inspired and empirically researched, it lies within the Hamilton Gardens on a young river terrace immediately adjacent to the Waikato River in Hamilton (Kirikiriroa), Aotearoa New Zealand. In this article, Wiremu Puke (Ngāti Wairere, Ngāti Porou) ‐ a tohunga whakairo (master carver, including using pre-steel tools) and a tohunga whakapapa (genealogical expert on his tribal affiliations) of Ngāti Wairere (the mana whenua, or first people of the traditional ancestral tribal lands of Kirikiriroa) ‐ describes the design and development of Te Parapara Garden from its initial concept in 2003 and the construction of its many features, including the waharoa (gateway), pou (carved pillars), pātaka (storehouse), whatarangi (small storehouse), taeapa (fencing) and rua kūmara (underground storage pit), and the sourcing and use of kōkōwai (red ochre). The garden was completed in 2010. Its ongoing functioning, including the annual planting and harvesting of traditional pre-European kūmara (sweet potato) using modified, mounded soils (puke or ahu), is also covered. The unique Te Parapara Garden is of great cultural importance and a source of pride, knowledge and understanding for national and international visitors and empirical and academic researchers.

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Kojola, Ilpo, Timo Helle et Pekka Aikio. « Productivity of semi-domesticated reindeer in Finland ». Rangifer 11, n^o 2 (1 octobre 1991) : 53. http://dx.doi.org/10.7557/2.11.2.978.

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In spite of a twofold increase in the density of reindeer in Finland from 1974 to 1987, meat production per reindeer increased during this period. This was possible due to calf harvesting and supplemental feeding. Results from multiple regression models indicated that calf harvesting influenced both per unit area and per capita production more than supplemental feeding. Correlation between meat production and animal density decreased with increased supplemental feeding. Traditionally, southern and central herds of reindeer fed mainly on arboreal lichens in late winter; however, due to large-scale logging, woodlands rich of arboreal lichens had been greatly reduced. Economic carrying capacity of the winter range apparently has been exceeded in the south; a heavy crash in the number of reindeer is likely if supplemental feeding ceases. In northern herds, intensive calf harvesting enabled satisfactory yield without supplemental feeding. In northern herds, yield increased mainly per unit area (i.e. by increases in herd size); in the south yield per reindeer increased.Lithantuotantoon vaikuttavat tekijat Suomen poron-hoidossa.Abstract in Finnish / Tiivistelmd: Huolimatta Suomessa vuosien 1974 ja 1987 valilla tapahtuneesta porotiheyden kaksinkertaistumisesta, lihantuotto poroa kohti kasvoi jakson aikana. Tama johtui oletettavasti vasateurastuksesta ja lisaruokinnasta. Monimu-uttujaregressiomallien tulosten perusteella vasateurastuksella nayttaisi olevan lisaruokintaa suurempi vaikutus seka poroa etta pinta-alaa kohti laskettuun tuottoon. Ruokinnan tehostuessa pienentyi lihantuoton ja porotiheyden valinen riippuvuus. Etelaosan ja keskiosan porot syovat perinteisesti puussa kasvavia jakalia kevattalvella. Hakkuista johtuen luppometsien osuus on suuresti vahentynyt. Talvilaidunten ekonomien kantokyky on ilmeisesti ylitetty etela- ja keski-osassa; syva romahdus poromaarissa on todennakoista, jos ruokinta lopetettaisiin. Pohjoisosassa voima-perainen vasate-urastus mahdollistaa tyydyttavan tuoton ilman ruokintaa. Pohjoisessa tuotto kasvoi pinta-alayksikkoa kohden (poro-maarat kasvoivat), etelassa kasvoi poroa kohti laskettu tuotto.

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Tsai, Yu-Chih, Jechan Lee, Eilhann Kwon, Chao-Wei Huang, Nguyen Nhat Huy, Siming You, Pei-Syuan Hsu, Wen Da Oh et Kun-Yi Andrew Lin. « Enhanced Catalytic Soot Oxidation by Ce-Based MOF-Derived Ceria Nano-Bar with Promoted Oxygen Vacancy ». Catalysts 11, n^o 9 (18 septembre 2021) : 1128. http://dx.doi.org/10.3390/catal11091128.

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As CeO2 is a useful catalyst for soot elimination, it is important to develop CeO2 with higher contact areas, and reactivities for efficient soot oxidation and catalytic soot oxidation are basically controlled by structures and surface properties of catalysts. Herein, a Ce-Metal organic framework (MOFs) consisting of Ce and benzene-1,3,5-tricarboxylic acid (H3BTC) is employed as the precursor as CeBTC exhibits a unique bar-like high-aspect-ratio morphology, which is then transformed into CeO2 with a nanoscale bar-like configuration. More importantly, this CeO2 nanobar (CeONB) possesses porou, and even hollow structures, as well as more oxygen vacancies, enabling CeONB to become a promising catalyst for soot oxidation. Thus, CeONB shows a much higher catalytic activity than commercial CeO2 nanoparticle (comCeO) for soot oxidation with a significantly lower ignition temperature (Tig). Moreover, while soot oxidation by comCeO leads to production of CO together with CO2, CeONB can completely convert soot to CO2. The tight contact mode also enables CeONB to exhibit a very low Tig of 310 °C, whereas the existence of NO also enhances the soot oxidation by CeONB to reduce the Tig. The mechanism of NO-assisted soot oxidation is also examined, and validated by DRIFTS to identify the formation and transformation of nitrogen-containing intermediates. CeONB is also recyclable over many consecutive cycles and maintained its high catalytic activity for soot oxidation. These results demonstrate that CeONB is a promising and easily prepared high-aspect-ratio Ce-based catalyst for soot oxidation.

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Babu, Lenin, et Chandramouli Padmanabhan. « Hybrid Active and Passive Noise Control of Cavities ». Acta Acustica united with Acustica 97, n^o 5 (1 septembre 2011) : 752–60. http://dx.doi.org/10.3813/aaa.918455.

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In this paper a hybrid active noise control of a cavity with poro-elastic material has been investigated. It has been found that the noise reduction achieved with active noise control in the cavity without poro-elastic material is not significantly altered with the presence of poro-elastic materials. This is shown to be independent of the porous material and its thickness and is true both at lower and mid-frequency ranges. Further, it is seen that macro perforations do not alter the sound absorption performance of the poro-elastic material in the presence of active noise control. The results clearly indicate that one can choose a smaller thickness of the porous material when active noise control is used in a cavity for noise suppression.

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Pösö, A. Reeta. « Seasonal changes in reindeer physiology ». Rangifer 25, n^o 1 (1 avril 2005) : 31–38. http://dx.doi.org/10.7557/2.25.1.335.

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The seasonal changes in the photoperiod, temperature and availability of food need to be converted to hormonal signals in order to induce adaptations in the physiology of the reindeer. The most reliable of the seasonal changes in the environment is the photoperiod, which affects the reindeer physiology through pineal gland and its hormone, melatonin. Usually there are large diurnal changes in the concentration of melatonin, but in the reindeer the daily rhythm disappears during the arctic summer to return again in the autumn. Seasonal changes in melatonin secretion are involved in the regulation of reproduction, the growth of pelage, thermogenesis, body mass and immune function. Melatonin may exert its effects through gene activation, but the mechanisms are not completely understood. Other hormones that show seasonality are thyroid hormones, insulin and leptin. Thus the observed physiological changes are a result of actions of several hormones. Appetite, energy production and thermogenesis are all vital for survival. During winter, when energy balance is negative, the reindeer uses mainly body fat for energy production. The use of fat stores is economical as the rate of lipolysis is controlled and the use of fatty acids in tissues such as muscle decreases. Only in severe starvation the rate of lipolysis increases enough to give rise to accumulation of ketone bodies. The protein mass is maintained and only in starved individuals muscle protein is used for energy production. The winter feed of the reindeer, the lichens, is poor in nitrogen and the nitrogen balance during winter is strongly negative. Reindeer responds to limited availability of nitrogen by increasing the recycling of urea into rumen. In general the adaptation of reindeer physiology enables the reindeer to survive the winter and although several aspects are known many others require further studies.Abstract in Finnish / Tiivistelmä: Valaistus, lämpötila ja ravinnon saatavuus vaihtelevat vuodenajn mukaan. Jotta nämä muutokset voisivat saada aikaan adaptiivisia muutoksia porossa, ne täytyy muutta hormonisignaaleiksi. Luotettavin näistä edellä mainituista ympäristön vuodenaikaismuutoksista on valo, joka vaikuttaa poron elintoimintoihin käpylisäkkeen ja sen erittämän hormonin, melatoniinin, välityksellä. Melatoniinin plasmapitoisuuksissa on havaittavissa selkeä vuorokausirytmi, joka porolla häviää kesällä ja alkaa uudestaan syksyllä. Melatoniini-hormonin vuodenaikaisvaihtelut ovat mukana säätelemässä lisääntymistä, talvikarvan kasvua, lämmöntuottoa, elopainoa ja immuunitoimintoja. Melatoniini vaikuttaa geeniaktivaation kautta mekanismeilla, joita ei vielä tarkkaan tunneta. Muita hormoneja, joiden erityksessä on havaittu vuodenaikaisvaihtelua, ovat kilpirauhashormonit, insuliini ja leptiini. Havaitut muutokset ovat ilmeisesti usean hormonin yhteisvaikutuksen aiheuttamia. Ruokahalu sekä energian- että lämmöntuotto ovat keskeisiä hengissä säilymisen kannalta. Talvella poron energiatase on negatiivinen ja se käyttää lähinnä varastoimiaan rasvoja energian tuottoon. Rasvojen käyttö on ekonomista, sillä rasvojen hajoaminen, lipolyysi, on säädeltyä ja rasvahappojen käyttö lihaksissa vähenee talvella. Vasta vakavasti nälkiintyneissä poroissa lipolyysi aktivoituu siten, että myös ketoaineita alkaa kertyä vereen. Valkuaisaineiden määrä vähenee vähemmän kuin rasvojen ja ainoastaan nälkiintyneet porot käyttävät lihasten valkuaisaineita energiantuottoon. Poron talviravinnossa, jäkälässä, on vain vähän typpeä, joten talvisin typpitasapaino on voimakkaasti negatiivinen. Poro reagoi tähän vähäiseen typpimäärään lisäämällä urean kierrätystä pötsiin. Kokonaisuudessaan poron elintoimintojen sopeutuminen auttaa poroa selviytymään talven yli. Vaikka adaptaatiosta on joiltakin osin kertynyt runsaasti tietoa, on siinä myös paljon selvitettävää.

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Thèses sur le sujet "Porou"

ASNAGHI, DONATA. « Supramolecular porous crystals : anesthetic vapors uptake and enantioselective recognition properties ». Doctoral thesis, Università degli Studi di Milano-Bicocca, 2018. http://hdl.handle.net/10281/199107.

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La mia tesi tratta di materiali cristallini microporosi e delle loro proprietà di adsorbimento di gas e liquidi. Mi sono occupata di cristalli dipeptidici e di metal-organic frameworks. Innanzittutto, ho analizzato i Valil-Alanina, Alanil-Isoleucina, Valil-Valina, Alanil-Isoleucina e Isoleucil-Valina e ho testato le loro capacità di assorbimento di anestetici volatili. Sono state condotte isoterme di adsorbimento di enflurano, isoflurano, alotano, desflurano e dietiletere a 298 e a 273 K. VA, VV e AI presentano un’affinità elevata per i guests, rappresentata da calori isosterici superiori a 30 kJ/mol e quantità assorbite fino a 20 cm3/g. Invece, IA e IV si sono dimostrate inefficaci, a causa delle ristrette dimensioni dei loro canali. Sono stati realizzati esperimenti nmr allo stato solido per i nuclei 13C, 1H e 19F. Gli spettri 1H a 30 kHz mostrano due tipologie di segnali: a ppm più bassi quelli dei guest assorbiti nelle matrici, mentre a ppm più elevati quelli dei guest presenti solo sulla superficie esterna, a dimostrazione del riempimento completo dei canali. I pattern di diffrazione confermano inoltre la stabilità dei dipeptidi anche in presenza di guests. Successivamente, si è proceduto con l’ottimizzazione dei minimi conformazionali di enflurano e isoflurano, di cui sono stati simulati i relativi spettri nmr. Dal confronto tra gli spettri simulati e quelli sperimentali è risultato che l’isoflurano viene assorbito nella VA in una sola delle sue due conformazioni. Il passo successivo è stata l’indagine delle proprietà di enantioselettività di metal-organic frameworks omochirali. Sono stati studiati quattro MOFs a base di Cu(ll), caratterizzati dallo stesso legante organico tetracarbossilato, a cui sono attaccate catene contenenti differenti centri chirali, direzionati all’interno dei nanocanali. Dei primi due MOFs, 1-Cu e 3-Cu, immersi in soluzioni acquose enantiopure di triptofano, è stato monitorato l’assorbimento dei due enantiomeri nel tempo tramite spettroscopia UV-visibile. Il reticolo 3-Cu possiede una buona selettività, preferendo l’L-triptofano all’enantiomero D in rapporto superiore a 3.3:1 dopo trenta minuti. Gli altri due MOFs, caratterizzati da gruppi ossidrilici legati allo stereocentro, sono stati studiati per la separazione di miscele racemiche. La sec-butilammina, l’etilbenzilammina e la sec-benzamide, precursori farmaceutici, sono stati fatti assorbire in soluzione in presenza dei MOFs e i prodotti benzoilati derivanti dall’assorbimento sono stati analizzati tramite HPLC. I cromatogrammi presentano picchi completamente risolti e brevi tempi di analisi. I bassi valori di enantioselettività sono dovuti in un caso alle ridotte dimensioni della butiliammina, e nell’altro alla scarsa affinità dei MOFs per le molecole aromatiche. Nonostante ciò, questi MOFs potrebbero risultare efficaci nella separazione di molecole alifatiche a lunga catena.
Among the extensive family of supramolecular compounds, porous crystalline materials present appealing features: permanent porosity, good thermal and chemical stability, versatile functionalization, long-range order properties and multiple application branches. One of the latter is nanomedicine, which can spread from drug storage and delivery to enantioselective separation of pharmaceutical precursors. In my phD work I focused on two classes of crystalline microporous materials and their adsorption and enantioselective uptake properties. The porous dipeptides belonging to the Valyl-Alanine family result to be low density materials, with stable porosity and 1D chiral and hydrophobic channels. Five porous dipeptide matrixes, Valyl-Alanine, Alanyl-Isoleucine, Valyl-Valine, Isoleucyl-Alanine and Isoleucyl-Valine, were tested for the adsorption of volatile halogenated ethers used in general anesthesia, namely enflurane, isoflurane, halothane, desflurane and the common diethyl ether. Adsorption and desorption isotherms were performed at 273 and 298 K, showing the great affinity of the first three matrixes for the halogenated guests. The anesthetic molecules included in the dipeptide crystals were detected by 13C, 19F and fast- 1H MAS NMR spectroscopy. A conformational analysis on isoflurane and enflurane was conducted to determine the most stable energy minima and to simulate the relative NMR spectra, to be compared with the experimental ones. In the second part of the thesis, four new metal-organic frameworks (MOFs), characterized by alkyl moieties with enantiopure stereogenic centers lined inside the channels, are presented. The reaction between Cu(II) cations and organic tectons with methyl or hydroxyl groups bonded to the stereogenic carbons give tridimensional, stable and microporous structures, 1-Cu, 3-Cu, 1-Cu(OH) and 3-Cu(OH), respectively. First, the porosity of the homo-chiral MOFs was confirmed by N2 and CO2 adsorption isotherms. Then, the chiral and porous nature of these MOFs was explored for enantioselective uptake experiments. The first frameworks, 1-Cu and 3-Cu, thanks to their stability in water, were exploited for the adsorption in solution of the two enantiomers of tryptophan, monitored by UV-vis spectroscopy for 24 hours. The other two matrixes, 1-Cu(OH) and 3-Cu(OH), were employed for the resolution of racemic amines and amides by HPLC. After the soaking, the MOFs were carefully washed and on the remaining solutions a derivatization reaction was performed, in order to get aromatic compounds detectable by the UV-vis analyzer of the HPLC system. In conclusion, the first two MOFs showed a good selectivity, with 3-Cu preferentially adsorbing L-tryptophan in a ratio 3.3:1 compared to the D-isomer after just 30 minutes, while 1-Cu(OH) and 3-Cu(OH) presented negligible enantiomeric excess values.

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MANTRAVADI, NARESH VENKATA. « MEMS-BASED DEVELOPMENT OF A SILICON CPS WICK FOR LOOP HEAT PIPE APPLICATIONS ». University of Cincinnati / OhioLINK, 2001. http://rave.ohiolink.edu/etdc/view?acc_num=ucin978637264.

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Soutar, Monty. « Ngāti Porou leadership : Rāpata Wahawaha and the politics of conflict : "Kei te ora nei hoki tātou, me tō tātou whenua" / ». Online version, 2000. http://bibpurl.oclc.org/web/20809.

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Silva, Gildivan dos Santos. « Qualidade fÃsica de um argissolo acinzentado do municÃpio de Pacajus (CE) apÃs a aplicaÃÃo de resÃduo de caju ». Universidade Federal do CearÃ, 2013. http://www.teses.ufc.br/tde_busca/arquivo.php?codArquivo=11089.

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Conselho Nacional de Desenvolvimento CientÃfico e TecnolÃgico
Desde que o homem descobriu na agricultura uma forma de obter alimentos, a natureza passou a ser modificada. AlteraÃÃes foram causadas no ecossistema e com elas vieram as perdas na qualidade do solo. Com isso, sentiu-se a necessidade da implantaÃÃo de sistemas que preconizam pela conservaÃÃo do solo e, dessa forma, os resÃduos que antes eram queimados ou retirados da Ãrea agrÃcola comeÃam a ser deixados na superfÃcie do solo com o intuito de protegÃ-lo e promover melhorias na sua qualidade. Nesse contexto, a aplicaÃÃo de resÃduo orgÃnico no solo, como o bagaÃo de caju, pode trazer benefÃcios Ã qualidade fÃsica do mesmo. Diante do exposto, o objetivo da pesquisa foi avaliar o efeito da aplicaÃÃo de resÃduo de caju sobre a qualidade fÃsica do solo por meio de indicadores. Foram coletadas amostras de solo com estrutura preservada e nÃo preservada. As anÃlises foram determinadas em campo (infiltraÃÃo e condutividade hidrÃulica) e em laboratÃrio (Ãndice S e permeabilidade do solo ao ar). O delineamento empregado foi o de blocos ao acaso, composto por 5 tratamentos (cinco nÃveis de aplicaÃÃo â 0, 1, 2, 3, 4, que corresponde, respectivamente a: testemunha, 16, 32, 48, 64 t ha-1 de resÃduo orgÃnico) e quatro blocos. Para a anÃlise estatÃstica, verificou-se a normalidade dos dados a partir do teste de Kolmogorov-Smirnov e, em seguida, realizou-se a anÃlise de variÃncia e o teste Tukey a 5 % de probabilidade. Os valores condutividade hidrÃulica em solo saturado (K0) estiveram na faixa que variou de alta a muito alta, reduzindo a possibilidade de escoamento superficial. O resÃduo nÃo influenciou na retenÃÃo de Ãgua no solo, mesmo em doses elevadas. O Ãndice S mostrou valores acima dos considerados pela literatura (>0,035), sugerindo um bom indicador na qualidade estrutural do solo em estudo. A permeabilidade do solo ao ar (Kar) tambÃm demonstrou valores muito acima daquele considerado crÃtico (> 1Âm2), nÃo sendo, portanto, restritivo ao crescimento das plantas. Ã possÃvel afirmar que os resultados elevados K0, Ãndice S e Kar estiveram intimamente relacionados com a macroporosidade, caracterÃstica inerente ao solo utilizado nessa pesquisa. As doses crescentes de resÃduo de caju nÃo influenciaram significativamente nos resultados supracitados.
Since man discovered agriculture as a way to get food, nature has been modified. Changes were caused in the ecosystem and with them came the losses in soil quality. Therefore, it was presumed the need to implement systems that imply on the conservation of soil and thus the plant residues that were burned or removed from the agricultural area started to be left on the soil surface in order to protect the soil and to promote improvements in their quality. In this context, the application of plant residues on the soil, such as cashew residues, can bring benefits to physical quality of the soil. Given this, the present research objective was to evaluate the effect of cashew residue on soil physical quality measured through indicators. Samples were collected from both undisturbed not preserved soil. The analyzes were determined in the field (infiltration and hydraulic conductivity) and in the laboratory (index S and soil air permeability). The experimental design was randomized blocks, consisting of 5 treatments (five application rates: 0, 1, 2, 3, 4, which correspond, respectively, to: control, 16, 32, 48, 64 t ha-1 organic waste) and four blocks. For statistical analysis, it was verified the normality of data from the Kolmogorov-Smirnov and, then, followed by the analysis of variance and Tukey test at 5% probability. The values for saturated hydraulic conductivity (K0) was found to be in the range varying from high to very high, with reducing the possibility of superficial runoff. The residue did not affect the soil water content, even at high rate applications. The S index showed values above those shown in the literature (> 0.035), suggesting a good indicator of the soil quality under study. The soil air permeability (Kar) also had values above that considered critical (> 1μm2), being, therefore, limiting to plant growth. It can be argued that the high results K0, S and Kar were closely related to macroporosity, inherent characteristic of the soil used in this research. Increasing application rates of cashew residues did not significantly influence the above results.

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Vathylakis, Alexandros. « Reduction of broadband trailing edge noise by serrations ». Thesis, Brunel University, 2015. http://bura.brunel.ac.uk/handle/2438/11554.

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This thesis aims to investigate and reduce the aerodynamic noise source known as trailing edge noise, or airfoil self-noise, by using passive flow control techniques. Airfoil self-noise is produced when a turbulent boundary layer generated on an airfoil surface is scattered by the airfoil’s trailing edge. The investigation is of experimental nature, conducted in the aeroacoustic as well as aerodynamic wind tunnel facilities at Brunel University London and the Institute of Sound and Vibration (ISVR) at the University of Southampton. The research is relevant for any application in which airfoil blades encounter a smooth non-turbulent inflow and hence where trailing edge noise is a dominant noise source. Potential applications can therefore be fan or rotor blades in aero-engines, wind turbine blades or industrial cooling fans. The approach taken for the reduction of trailing edge noise utilises passive flow control techniques through the use of trailing edge serrations and the additional support of porous materials. Both of the aforementioned are inspired by the owl’s silent flight due to its unique wing structure. The research presented here can be divided in three parts: The first part comprises an extensive assessment of the performance of non-flat plate trailing edge serrations for airfoil broadband noise and their aerodynamic performance in terms of lift and drag. It is found that serrations can realistically achieve noteworthy broadband airfoil self-noise reductions, however due to the fact that non-flat plate serrations are directly cut into the airfoil body, the blunt sections in the serration root produce an additional noise source of vortex shedding tonal noise. The second part investigates the two flow mechanisms involved. Regarding the mechanism responsible for broadband noise and the subsequent reductions by the serration geometry, the turbulent boundary layer structures are studied in depth on a serrated trailing edge of a flat plate. Experimental techniques such as hot wire anemometry, liquid crystal flow visualisation, unsteady surface pressure measurements and noise measurements are used. A redistribution of the momentum and turbulent energy near the sawtooth tip and side edges appears to reduce the trailing edge noise scattering-efficiency of the hydrodynamic pressure waves. For the study of the flow mechanism responsible for the vortex shedding tonal noise increase, noise and velocity measurements along with flow visualisation techniques are used for the identification and further understanding of this noise source. A highly three-dimensional wake-flow could be identified in the wake past the serration gap, which differs from the longitudinal vortices shed from a straight blunt serration root. The third part presents the concept of poro-serrated trailing edges as a novel method to substantially improve the overall noise performance of the non-flat plate trailing edge serration type. The use of porous metal foams or thin brush bundles which fill the interstices between adjacent members of the sawtooth can completely suppress the bluntness-induced vortex shedding noise. Most importantly a turbulent broadband noise reduction of up to 7 dB can be achieved without compromising the aerodynamic performances in lift and drag. The new serrated trailing edges do not cause any noise increase throughout the frequency range investigated here. Through noise and velocity measurements near the trailing edge of an airfoil, the reduction of the broadband noise is found to be primarily caused by the sawtooth geometry. The new serrated trailing edges have the potential to improve the industrial worthiness of the serration technology in achieving low noise radiation.

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Chen, Xiaohui. « Unsaturated hydro-chemo-mechanical modelling based on modified mixture theory ». Thesis, University of Manchester, 2010. https://www.research.manchester.ac.uk/portal/en/theses/unsaturated-hydrochemomechanical-modelling-based-on-modified-mixture-theory(64ec76bb-1379-4e87-b9a7-562fa9267404).html.

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New unsaturated coupled models have been developed for fluid transport in deformable rock by using modified mixture theory rather than a fully mechanics-based approach. These models include the following: an unsaturated hydro-mechanical coupled model for both non-swelling and swelling materials, in which a new coupled formulation for hydration swelling rock has been included; and an unsaturated hydro-mechanical-chemo coupled model, incorporating a new coupled formulation including osmosis flow and an unsaturated version of Darcy's law which has been extended by including osmosis effects.Modified mixture theory is mainly based on non-equilibrium thermodynamics. Helmholtz free energy is used to give the energy relationship between the fluids and solid and, by using the Gibbs-Duhem equation, the interactions between different fluids such as gas, water and chemical can be obtained. In this research, general coupled formulations for both large small and deformations have been obtained. For swelling rocks, the water between the clay platelets can be modeled by including the difference between the free energy of whole domain and that of the pore water plus the solid skeleton. By assuming small deformations, the final equations can be compared with those derived using the mechanics approach.The new coupled models have been tested by carrying out simple benchmark numerical simulations using finite elements. Problems analyzed include: (1) the consolidation of saturated swelling rocks in which the hydration swelling effects on consolidation have been analysed in detail; (2) the desaturation and resaturation of seasonally affected rocks around tunnels; (3) the desaturation stage for swelling rocks used in the containment of nuclear waste disposal; (4) chemical transport in very low permeability rock used for nuclear waste disposal, in which particular attention has been focused on osmosis flow and chemical consolidation. In summary, this thesis extends modified mixture theory and develops new coupled formulations which can be applied to deep nuclear waste disposal, including tunnelling, drilling and chemical transport in low permeability host rock.

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Najmi, Hussain. « Selectivity of Porous Composite Materials for Multispecies mixtures : Application to Fuel Cells ». Thesis, Bourges, INSA Centre Val de Loire, 2018. http://www.theses.fr/2018ISAB0001/document.

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L'utilisation de pile à combustible à bord d'un avion impose d'extraire des espèces légères (telles que l'hydrogène et les hydrocarbures légers) du combustible liquide qui est stocké et utilisé, éventuellement à des températures où se produit une pyrolyse du carburant. La porosité d’un matériau composite pourrait être utilisée pour filtrer les espèces sélectionnées. L'efficacité de séparation d’un matériau poreux dépend de deux facteurs qui sont: la perméance et la sélectivité.Ces facteurs sont souvent déterminés avec une configuration classique utilisant un échantillon en forme d’un disque d’un matériau poreux. Cependant, cette configuration est loin de la réalité qui est composée de tubes. Par conséquent, une étude est réalisée en considérant les deux configurations en utilisant différents types de disques poreux et un tube composite poreux. Ensuite, les résultats obtenus sont comparés et les différents facteurs affectant le processus de perméation sont étudiés.Après cela, un banc d'essai innovant est développé et utilisé afin de déterminer la distribution axiale des deux propriétés d'un tube poreux en acier inoxydable (c'est-à-dire la perméance et la sélectivité). Les effets des conditions opératoires (débit massique d'entrée et pression d'entrée) ont été étudiés. Une nouvelle forme radiale de l'équation de perméabilité aux gaz a été développée pour ce travail et sa relation avec la perméabilité de Darcy est établie. La variation de pression le long de l'axe central du tube est déterminée. Les effets de cette variation de pression sur les propriétés physiques des gaz tels que la densité et la viscosité sont déterminés et leur influence sur la sélectivité est étudiée en utilisant différents gaz tels que l'azote, le dioxyde de carbone, le méthane et l'hélium.Plus tard, un mélange binaire de dioxyde de carbone (CO2) et d'Azote (N2) est considéré sous trois compositions volumétriques différentes (50/50%, 60/40% et 70/30%) afin d'évaluer la propriété de séparation de gaz d’un tube poreux (effet de membrane). La perméabilité au gaz pur, la perméabilité du mélange, la sélectivité idéale et la sélectivité de séparation de ce tube sont déterminées pour un débit massique et une pression d'entrée différents. Les facteurs affectant les distributions de CO2 et de N2 à l'intérieur du tube poreux sont étudiés.Les résultats obtenus peuvent être utiles pour comprendre les facteurs affectant la séparation des gaz dans le cas d'un tube poreux pour des processus industriels continus
Using Fuel Cell on board of aircraft imposes to extract light species (such as Hydrogen and light hydrocarbons) from the liquid fuel which is stored and used, possibly at temperatures where a fuel pyrolysis occurs. Porosity of a composite material could be used to filtrate the selected species. The separation efficiency of a porous material depends upon two factors which are: Permeance and Selectivity.These factors are often determined with a classical configuration using a porous disk sample. However, this configuration is far from the realistic one consisting of tubes. Therefore, a study is performed considering both configurations using different types of porous disks and a porous composite tube. Then, the obtained results are compared and the different factors affecting the permeation process are studied.After that, an innovative permselectivity test bench is developed and used in order to determine the axial distribution of the two properties of a stainless steel porous tube (i.e. permeance and selectivity). The effects of the operating conditions (inlet mass flowrate and inlet pressure) have been studied. A new radial form of the gas permeability equation has been developed for this work and its relationship with Darcy‘s permeability is established. The pressure variation along the centre axis of the tube is determined. The effects of this pressure variation on the physical properties of gases such as density and viscosity are determined and their influence on the selectivity is studied using different gases such as Nitrogen, Carbon dioxide, Methane, and Helium. Later, a binary mixture of Carbon Dioxide (CO2) and of Nitrogen (N2) is considered under three different volumetric compositions (50/50%, 60/40% and 70/30%) in order to evaluate the separation property of the porous stainless steel tube (membrane effect). The pure gas permeability, the mixture permeability, the ideal selectivity and the separation selectivity of this tube are determined for a different mass flowrate and inlet pressure. The factors affecting the distributions of CO2 and N2 inside the porous tube are investigated. The obtained results can be useful to understand the factors affecting gas separation in case of a porous tube for continuous industrial processes

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Farid, Mohammad Hosseini. « Mechanical Characterization and Constitutive Modeling of Rate-dependent Viscoelastic Brain Tissue under High Rate Loadings ». Diss., North Dakota State University, 2019. https://hdl.handle.net/10365/29786.

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In this dissertation, theoretical, computational, and experimental methodologies are introduced to determine the rate-dependent material properties of the brain tissue. Experiments have shown that the brain tissue is significantly rate-dependent. To examine the range of strain rates at which trauma might happen, a validated finite element (FE) human head model was initially employed to examine the biomechanics and dynamic behavior of the head and brain under impact and blast loads. The strain rates to cause traumatic brain injury (TBI) were found to be in the range of 36 to 241 1/s, under these types of loadings. These findings provided a good estimation prior to exploring the required experiments for characterizing the brain tissue. The brain samples were tested by employing unconfined compression tests at three different deformation rates of 10 (n= 10 brain samples), 100 (n=8), and 1000 mm/sec (n=12). It was found that the tissue exhibited a significant rate-dependent behavior with various compression rates. Two different material characterization approaches were proposed to evaluate the rate-dependent mechanical responses of the brain. In the first approach, based on the parallel rheological framework, a single-phase viscoelastic model which captures the key aspects of the rate-dependency in large strain behavior was introduced. The extracted material parameters showed an excellent constitutive representation of tissue response in comparison with the experimental test results (R^2=0.999). The obtained material parameters were employed in the FE simulations of the brain tissue and successfully verified by the experimental results. In the second approach, the brain tissue is modeled as a biphasic continuum, consisting of a compressible solid matrix fully saturated with an incompressible interstitial fluid. The governing equations based on conservation of mass and momentum are used to describe the solid-fluid interactions. This viscoelastic biphasic model can effectively estimate the rate-dependent tissue deformations, the hydrostatic pressure as well as fluid diffusion through the tissue. Although both single-phasic, as well as bi-phasic models, can successfully capture the key aspects of the rate-dependency in large strain deformation, it was shown the biphasic model can demystify more phenomenological behavior of this tissue that could not be perceived with yet established, single-phasic approaches.

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Kunik, Serguei. « Étude numérique et expérimentale du mécanisme de lubrification eX-Poro-HydroDynamique (XPHD) ». Thesis, Poitiers, 2018. http://www.theses.fr/2018POIT2264/document.

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La lubrification eX-Poro-HydroDynamique (XPHD) est un mécanisme de lubrification d’inspiration biomimétique. Il s’agit principalement d’un écoulement dans un milieu poreux, dont la phase solide représentée par des fibres, induit des forces élastiques de compression considérées comme négligeables par rapport aux forces hydrodynamiques générées à l’intérieur du milieu poreux. L’idée essentielle de la lubrification XPHD consiste en remplacement du matériau antifriction et du film de fluide mince, traditionnellement utilisé dans les solutions classiques, par une couche poreuse imbibée d’un fluide qui fournit plus grande capacité de charge. Ce type de lubrification représente une solution technologique totalement nouvelle (en rupture avec la solution classique) qui peut permettre de remplacer les lubrifiants pétroliers, de créer des systèmes tribologiques autolubrifiants et donc plus écologiques et moins coûteux. Ce travail de recherche est donc focalisé sur l’évolution des performances de la lubrification XPHD dans le cadre d’un mouvement tangentiel, adapté à l’étude de butées pour faible et moyenne vitesses de rotation. Dans ce contexte scientifique, une étude approfondie d’un matériau poreux présélectionné (mousse en polyuréthane) fut réalisée avec le but de déterminer les caractéristiques physiques et les paramètres cruciaux pour la lubrification XPHD: la porosité et la perméabilité du matériau poreux. Les modèles théorique et numérique de lubrification XPHD proposés se basent sur l’équation de Darcy-Brinkman et les hypothèses de la lubrification classique, ainsi que l’écoulement à l’intérieur du milieu poreux sont prédit avec une nouvelle forme de l’équation de Reynolds. Le banc d’essais spécialement développé permet d’étudier expérimentalement le mécanisme de lubrification XPHD pour des différents types de dislocateur en combinaison avec des liquides newtoniens et nonnewtoniens. Une description détaillée du banc d’essais et de tous les dispositifs expérimentaux utilisés ainsi que la comparaison des résultats de modélisation et des résultats expérimentaux sont présentés
The eX-Poro-HydroDynamic (XPHD) lubrication is a new biomimetic inspired lubrication mechanism. It consists of self-sustained fluid films generated within highly compressible porous layers imbibed with liquids, whose solid phase represented by fibers, induces compressive elastic forces considered negligible compared to the hydrodynamic forces generated inside the porous medium. The essential idea of XPHD lubrication is to replace the antifriction material and the thin fluid film, traditionally used for classical sliding motion, with a porous layer imbibed with a fluid that provides a greater load capacity. This type of lubrication represents a completely new technological solution (in rupture with the classical one) that can replace petroleum lubricants, create self-lubricating and therefore more ecological and less expensive tribological systems. This research work is focused on the evolution of XPHD lubrication performances in the context of a tangential movement, adapted to the study of thrust bearing for low and medium rotation speeds. In this scientific context, a thorough study of a preselected porous material (polyurethane foam) was carried out with the aim of determining the physical characteristics and the crucial parameters for XPHD lubrication: the porosity and the permeability of the porous material. The theoretical and numerical models of the XPHD lubrication proposed are based on the Darcy-Brinkman equation and the classical lubrication hypothesis, as well as the flow within the porous media is predicted with a new form of the Reynolds equation. The specially developed test rig is used to investigate experimentally the mechanism of the XPHD lubrication for different types of thrust bearing in combination with Newtonian and non-Newtonian liquids. A detailed description of the test rig and all used experimental devices, as well the comparison between the experimental and numerical results are presented

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Henselwood, Fred William. « Porous and non-porous water soluble polymer nanospheres ». Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1998. http://www.collectionscanada.ca/obj/s4/f2/dsk2/ftp02/NQ31033.pdf.

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Livres sur le sujet "Porou"

Sklavenitēs, Christophoros D. Moirologia Porou Leukadas. Athēna : Hetaireia Leukadikōn Meletōn, 2012.

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John, Craxton, Freud Lucian et Tagopoulos Constance translator, dir. Tzon Kraxton-Lousian Phroint : Ta paidia tou Porou. Athēna : Ekdoseis Sokolē-Souledakē, 2012.

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McConnell, Robert N. He taonga anō : More Ngāti Porou stories from the East Cape. Auckland, [N.Z.] : Reed, 2002.

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Tamati, Reedy, dir. Meeting-houses of Ngāti Porou o Te Tai Rāwhiti : An illustrated guide. Auckland [N.Z.] : Reed Books, 2006.

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Kollias, Vasileios-Alexandros N. Archeio Kōnstantinou Logothetē Douzina (1803-1830) : Symvolē stēn historia tēs Nēsou Porou. Chalandri : Ekdoseis Kameiros, 2018.

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Athanasiou, Giōrgos K. Hē prosphora tou Porou ston Agōna tou 1821 kai hoi poriōtes agōnistes. Poros : [G. K. Athanasiou], 2008.

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Ruatapu, Mohi. Ngā kōrero a Mohi Ruatapu, tohunga rongonui o Ngāti Porou = : The writings of Mohi Ruatapu. Christchurch, N.Z : Canterbury University Press, 1993.

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Hogan, Helen M. Hikurangi ki Homburg : Henare Kohere and Terei Ngatai with the Māori Coronation Contingent 1902. Christchurch, N.Z : Clerestory Press, 1997.

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The East Coast settlement report. Wellington, N.Z : Legislation Direct, 2010.

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Stojkovski, Gligor. Poroj. Skopje : Detska radost, 1998.

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Chapitres de livres sur le sujet "Porou"

Mulholland, Neil. « Porous ». Dans Re-imagining the Art School, 39–59. Cham : Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-030-20629-1_3.

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Umebayashi, Katsu, Thomas Daniell, Michael Webb, Peter Allison et Kazuhiro Kojima. « Porous ». Dans FOBA, 59–70. New York, NY : Princeton Archit.Press, 2005. http://dx.doi.org/10.1007/1-56898-635-1_6.

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Feng, Z., P. Gu, M. Zheng, X. Yan et D. W. Bao. « Environmental Data-Driven Performance-Based Topological Optimisation for Morphology Evolution of Artificial Taihu Stone ». Dans Proceedings of the 2021 DigitalFUTURES, 117–28. Singapore : Springer Singapore, 2021. http://dx.doi.org/10.1007/978-981-16-5983-6_11.

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AbstractTaihu stone is the most famous one among the top four stones in China. It is formed by the water's erosion in Taihu Lake for hundreds or even thousands of years. It has become a common ornamental stone in classical Chinese gardens because of its porous and intricate forms. At the same time, it has become a cultural symbol through thousands of years of history in China; later, people researched its spatial aesthetics; there are also some studies on its structural properties. For example, it has been found that the opening of Taihu stone caves has a steady-state effect which people develop its value in the theory of Poros City, Porosity in Architecture and some cultural symbols based on the original ornamental value of Taihu stone. This paper introduces a hybrid generative design method that integrates the Computational Fluid Dynamics (CFD) and Bi-directional Evolutionary Structural Optimization (BESO) techniques. Computational Fluid Dynamics (CFD) simulation enables architects and engineers to predict and optimise the performance of buildings and environment in the early stage of the design and topology optimisation techniques BESO has been widely used in structural design to evolve a structure from the full design domain towards an optimum by gradually removing inefficient material and adding materials simultaneously. This research aims to design the artificial Taihu stone based on the environmental data-driven performance feedback using the topological optimisation method. As traditional and historical ornament craftwork in China, the new artificial Taihu stone stimulates thinking about the new value and unique significance of the cultural symbol of Taihu stone in modern society. It proposes possibilities and reflections on exploring the related fields of Porosity in Architecture and Poros City from the perspective of structure.

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Ishizaki, K., S. Komarneni et M. Nanko. « Introduction ». Dans Porous Materials, 1–11. Boston, MA : Springer US, 1998. http://dx.doi.org/10.1007/978-1-4615-5811-8_1.

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Ishizaki, K., S. Komarneni et M. Nanko. « Powder compacts and green bodies for porous materials ». Dans Porous Materials, 12–37. Boston, MA : Springer US, 1998. http://dx.doi.org/10.1007/978-1-4615-5811-8_2.

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Ishizaki, K., S. Komarneni et M. Nanko. « Sintering mechanisms and advanced sintering methods for porous materials ». Dans Porous Materials, 38–66. Boston, MA : Springer US, 1998. http://dx.doi.org/10.1007/978-1-4615-5811-8_3.

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Ishizaki, K., S. Komarneni et M. Nanko. « Sol-gel processing, designing porosity, pore size and polarity, and shaping processes ». Dans Porous Materials, 67–180. Boston, MA : Springer US, 1998. http://dx.doi.org/10.1007/978-1-4615-5811-8_4.

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Ishizaki, K., S. Komarneni et M. Nanko. « Applications of porous materials ». Dans Porous Materials, 181–201. Boston, MA : Springer US, 1998. http://dx.doi.org/10.1007/978-1-4615-5811-8_5.

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Ishizaki, K., S. Komarneni et M. Nanko. « Properties and evaluation techniques for porous materials ». Dans Porous Materials, 202–24. Boston, MA : Springer US, 1998. http://dx.doi.org/10.1007/978-1-4615-5811-8_6.

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McKeown, Neil B., et Peter M. Budd. « Polymers with Inherent Microporosity ». Dans Porous Polymers, 1–29. Hoboken, NJ, USA : John Wiley & Sons, Inc., 2011. http://dx.doi.org/10.1002/9780470929445.ch1.

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Actes de conférences sur le sujet "Porou"

Yang, Haidi, et Li-yun Fu. « Poro-acoustoelasticity FD simulation of elastic wave propagation in prestressed porous media ». Dans Second International Meeting for Applied Geoscience & Energy. Society of Exploration Geophysicists and American Association of Petroleum Geologists, 2022. http://dx.doi.org/10.1190/image2022-3739604.1.

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Ahmadi, Goodarz, Ali Reza Mazaheri et Duane H. Smith. « Multiphase Flows Through Poro-Elastic Media : A Continuum Model ». Dans ASME 2002 International Mechanical Engineering Congress and Exposition. ASMEDC, 2002. http://dx.doi.org/10.1115/imece2002-32492.

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Based on the basic balance laws and the second law of thermodynamics, a model for multiphase fluid flows through poro-elastic media is presented. The basic conservation laws. Including the balance of phasic equilibrated forces are are described. Based on the thermodynamics of the multiphase mixture, appropriate constitutive equations are formulated. It is shown that the present theory leads to the extension of Darcy’s law and contains, as its special case, Biot’s (1957) theory of saturated poro-elastic media. The special case of gas-liquid flows in porous media is discussed.

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Liao, Chengcong, Hongyi Zhao et Dong-Sheng Jeng. « Poro-Elasto-Plastic Model for Wave-Induced Liquefaction ». Dans ASME 2014 33rd International Conference on Ocean, Offshore and Arctic Engineering. American Society of Mechanical Engineers, 2014. http://dx.doi.org/10.1115/omae2014-24480.

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In this study, a two-dimensional poro-elasto-plastic model for the wave-induced liquefaction in a porous seabed was presented. Two mechanisms of the wave-induced pore pressures were considered. Both elastic components (for oscillatory) and the plastic components (for residual) were integrated to predict the wave-induced excess pore pressures in marine sediments. The proposed 2D poro-elasto-plastic model allows for the pore pressure build-up process in a sandy seabed. The proposed model overall agreed well with the previous wave experiments and centrifuge tests. Numerical example shows that the pattern of progressive waves -induced liquefaction gradually changed from 2D to 1D.

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Buonomo, Bernardo, Oronzio Manca et Sergio Nardini. « Transient Natural Convection in Convergent Vertical Channels With Porous Media ». Dans ASME 2008 International Mechanical Engineering Congress and Exposition. ASMEDC, 2008. http://dx.doi.org/10.1115/imece2008-68907.

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In this paper transient natural convection in a vertical convergent channel with or without saturated porous medium is studied numerically. The investigation is carried out in laminar, two dimensional regime and employing the Brinkman-Forchheimer-extended Darcy model. The physical domain consists of two non-parallel plates which form a convergent channel. Both plates are heated at uniform heat flux. The solutions are achieved using the commercial code FLUENT. A finite-extension computational domain is employed to simulate the free-stream condition. The results are obtained for different convergence angles, for 0° to 5°, and porosity coefficient (0.4, 0.6 and 0.9), a channel aspect ratio equal to 10, a Rayleigh number equal to 104 and a Darcy number equal to 0.01. The dimensionless results are reported in terms of average and maximum wall temperatures, average Nusselt number as a function of time and at steady state wall temperature, local Nusselt number and temperature and stream function fields. The cases with porous medium in the channel shows that in conductive regime dominant, at initial time, average and maximum wall temperatures are lower than the case without porous medium in the channel. For the convective regime dominant, the lowest average and maximum wall temperatures are attained for the case without porour medium in the channel. At steady state, in the inlet zone the cases with porous medium present wall temperature lower than the no porous case. In the other part of the channel the opposite behaviour is detected.

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Vasilopoulos, Dimitrios, Kaoutar Elkhiyaoui, Refik Molva et Melek Onen. « POROS ». Dans ASIA CCS '18 : ACM Asia Conference on Computer and Communications Security. New York, NY, USA : ACM, 2018. http://dx.doi.org/10.1145/3201595.3201600.

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Bourgeat, Alain P., Claude Carasso, Stephan Luckhaus et Andro Mikelić. « Mathematical Modelling of Flow Through Porous Media ». Dans Conference on Mathematical Modelling of Flow Through Porous Media. WORLD SCIENTIFIC, 1996. http://dx.doi.org/10.1142/9789814531955.

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Lianqing*, Qi, Yin YanJun, Wang Yu, Song Kaoping, Qiao Weihong, Hou Jirui, Peng Bo et Wang Hongshen. « Open a new chapter in petroleum geology — The establishment of microcosmic spatial oil-water distribution model of reservoir core ». Dans 7th Workshop on Porous Media : Structure, Flow and Dynamics. Society of Exploration Geophysicists, 2021. http://dx.doi.org/10.1190/prmd2020-04.1.

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Wang, Yudi, Yungui Xu, Jing Tang et Xuri Huang. « Stochastic modeling of two-dimensional fractures with property constraints ». Dans 7th Workshop on Porous Media : Structure, Flow and Dynamics. Society of Exploration Geophysicists, 2021. http://dx.doi.org/10.1190/prmd2020-02.1.

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Li*, Jimmy X., Reza Rezaee, Tobias M. Müller, Mahyar Madadi, Rupeng Ma et Mohammad Sarmadivaleh. « Path dispersion of elastic waves in granular matter ». Dans 7th Workshop on Porous Media : Structure, Flow and Dynamics. Society of Exploration Geophysicists, 2021. http://dx.doi.org/10.1190/prmd2020-05.1.

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He, Zhili, Cong Hou* et Mengqi Jin. « Rock image reconstruction based on Improved Markov chain Monte Carlo ». Dans 7th Workshop on Porous Media : Structure, Flow and Dynamics. Society of Exploration Geophysicists, 2021. http://dx.doi.org/10.1190/prmd2020-01.1.

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Rapports d'organisations sur le sujet "Porou"

Lohne, Arild, Arne Stavland, Siv Marie Åsen, Olav Aursjø et Aksel Hiorth. Recommended polymer workflow : Interpretation and parameter identification. University of Stavanger, novembre 2021. http://dx.doi.org/10.31265/usps.202.

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Injecting a polymer solution into a porous medium significantly increases the modeling complexity, compared to model a polymer bulk solution. Even if the polymer solution is injected at a constant rate into the porous medium, the polymers experience different flow regimes in each pore and pore throat. The main challenge is to assign a macroscopic porous media “viscosity” to the fluid which can be used in Darcy law to get the correct relationship between the injection rate and pressure drop. One can achieve this by simply tabulating experimental results (e.g., injection rate vs pressure drop). The challenge with the tabulated approach is that it requires a huge experimental database to tabulate all kind of possible situations that might occur in a reservoir (e.g., changing temperature, salinity, flooding history, permeability, porosity, wettability etc.). The approach presented in this report is to model the mechanisms and describe them in terms of mathematical models. The mathematical model contains a limited number of parameters that needs to be determined experimentally. Once these parameters are determined, there is in principle no need to perform additional experiments.

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Grote, Christopher John. Hierarchical Porous Structures. Office of Scientific and Technical Information (OSTI), juin 2016. http://dx.doi.org/10.2172/1257114.

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Dillon, J. Combustion in porous media. Office of Scientific and Technical Information (OSTI), septembre 1999. http://dx.doi.org/10.2172/765956.

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Dehoff, Ryan R., et Michael M. Kirka. Additive Manufacturing of Porous Metal. Office of Scientific and Technical Information (OSTI), juin 2017. http://dx.doi.org/10.2172/1362246.

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Bayu Aji, L., I. Winter, T. Fears et S. Kucheyev. Sculpting Non-Machinable Porous Materials. Office of Scientific and Technical Information (OSTI), septembre 2020. http://dx.doi.org/10.2172/1668504.

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Brar, N. S., Z. Rosenberg et S. J. Bless. Dynamic Properties of Porous B4C. Fort Belvoir, VA : Defense Technical Information Center, janvier 1990. http://dx.doi.org/10.21236/ada222850.

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