Увійти

Готові списки джерел за темами / Gradient salin

Зміст

Статті в журналах
Дисертації
Книги
Частини книг
Тези доповідей конференцій

Добірка наукової літератури з теми "Gradient salin"

Автор: Grafiati

Опубліковано: 30 листопада 2024

Оформте джерело за APA, MLA, Chicago, Harvard та іншими стилями

Оберіть тип джерела:

Ознайомтеся зі списками актуальних статей, книг, дисертацій, тез та інших наукових джерел на тему "Gradient salin".

Біля кожної праці в переліку літератури доступна кнопка «Додати до бібліографії». Скористайтеся нею – і ми автоматично оформимо бібліографічне посилання на обрану працю в потрібному вам стилі цитування: APA, MLA, «Гарвард», «Чикаго», «Ванкувер» тощо.

Також ви можете завантажити повний текст наукової публікації у форматі «.pdf» та прочитати онлайн анотацію до роботи, якщо відповідні параметри наявні в метаданих.

Статті в журналах з теми "Gradient salin"

1

Dixon, D. A., J. Graham, and M. N. Gray. "Hydraulic conductivity of clays in confined tests under low hydraulic gradients." Canadian Geotechnical Journal 36, no. 5 (1999): 815–25. http://dx.doi.org/10.1139/t99-057.

Повний текст джерела

Анотація:

Clay barriers normally function at hydraulic gradients much lower than are commonly used in laboratory tests for hydraulic conductivity. This paper describes low-gradient tests on compacted illite, Na-bentonite, and sand-bentonite specimens at a range of dry densities. The tests examined the effects of deionized or saline pore fluid, the initial degree of saturation at the time of compaction, and back-pressuring to achieve saturation during permeation. No "critical" or "threshold" gradients were observed. In low-density materials, "transitional" gradients defined two separate regions of Darcia

Стилі APA, Harvard, Vancouver, ISO та ін.

2

Chittur K, Subramaniam, Aishwarya Chandran, Ashwini Khandelwal, and Sivakumar A. "Energy Conversion using electrolytic concentration gradients." MRS Proceedings 1774 (2015): 51–62. http://dx.doi.org/10.1557/opl.2015.758.

Повний текст джерела

Анотація:

ABSTRACTSalinity gradient is an enormous source of clean energy. A process for potential generation from an ionic concentration gradient produced in single and multicell assembly is presented. The ionic gradient is created using a fuel cell type cell with a micro-porous ion exchange membrane, both anionic (AEM) and cationic (CEM). Various salinity gradients, Salt : Fresh, from 100 : 0 to 16000 : 0 was established using NaCl solution, in the electrode chambers. A potential of 20 mV/cm to 25 mV/cm can be realized at ambient temperatures and pressures for a bipolar AEM/CEM cell. The performance w

Стилі APA, Harvard, Vancouver, ISO та ін.

3

KASYANOV, A. E., and ISMAIL KHEBA ISMAIL KHEBA. "INSTALLATION FOR PHYSICAL MODELING OF SALINE SOILS WASHING." Prirodoobustrojstvo, no. 2 (2021): 31–35. http://dx.doi.org/10.26897/1997-6011-2021-2-31-35.

Повний текст джерела

Анотація:

Gradients of salts concentrations of the soil solution, rinsing water pressures, filtration coefficients determine the flow intensity of the salt solutions in the aeration zone. There are known a lot of software for calculating the motion of salt solutions in the porous medium. To assess the accuracy of calculations of the salts movement in the soil, the data of gradient measurements are used. The implementation of the known methods of physical modeling on the soil monoliths mounted according to Astapov, lysimetric installations, in experimental leaching of saline soils in the field requires s

Стилі APA, Harvard, Vancouver, ISO та ін.

4

Scheifele, Benjamin, Rich Pawlowicz, Tobias Sommer, and Alfred Wüest. "Double Diffusion in Saline Powell Lake, British Columbia." Journal of Physical Oceanography 44, no. 11 (2014): 2893–908. http://dx.doi.org/10.1175/jpo-d-14-0070.1.

Повний текст джерела

Анотація:

Abstract Powell Lake contains a deep layer of relic seawater separated from the ocean since the last ice age. Permanently stratified and geothermally heated from below, this deep layer is an isolated geophysical domain suitable for studying double-diffusive convection. High-resolution CTD and microstructure measurements show several double-diffusive staircases (Rρ = 1.6 to 6) in the deep water, separated vertically by smooth high-gradient regions with much larger density ratios. The lowest staircase contains steps that are laterally coherent on the basin scale and have a well-defined vertical

Стилі APA, Harvard, Vancouver, ISO та ін.

5

Amin, Fatima, Abdul Sattar Shaikh, Sohail Khan Bangash, et al. "Correlation between Intraoperative Direct and Transesophageal Echocardiographic Assessment of Right Ventricular Outflow Tract Pressure Gradient in Patients Undergoing Tetralogy of Fallot Repair." Pakistan Heart Journal 56, no. 1 (2023): 92–96. http://dx.doi.org/10.47144/phj.v56i1.2484.

Повний текст джерела

Анотація:

Objectives: The objective of this study was to determine the correlation between intraoperative direct (needle) and transesophageal echocardiographic (TEE) assessment of right ventricular outflow tract (RVOT) pressure gradient in patients undergoing Tetralogy of Fallot (TOF) repair. Methodology: A total of 100 patients underwent for TOF repair were included. After completion of surgery and successful weaning from cardiopulmonary bypass, the TEE derived RVOT gradients were obtained from, the midesophageal ascending aortic short axis (AA Sax) view, upper esophageal aortic arch short axis (Arch S

Стилі APA, Harvard, Vancouver, ISO та ін.

6

Niinemets, Ülo, Aljona Lukjanova, Ashley D. Sparrow, and Matthew H. Turnbull. "Light-acclimation of cladode photosynthetic potentials in Casuarina glauca: trade-offs between physiological and structural investments." Functional Plant Biology 32, no. 7 (2005): 571. http://dx.doi.org/10.1071/fp05037.

Повний текст джерела

Анотація:

Many arid and saline habitat species possess sparse canopies with cylindrical foliage that is considered relatively invariable along environmental gradients. However, even in sparse canopies strong gradients of light develop between the canopy top and bottom. We studied structural and photosynthetic acclimation to within-canopy light gradient in Casuarina glauca Sieb. ex Spreng., the photosynthetic organs of which are cylindrical cladodes. Seasonal average integrated quantum flux density (Qint) varied 25-fold between the canopy top and the canopy bottom. Cladode cross-sectional shape was unaff

Стилі APA, Harvard, Vancouver, ISO та ін.

7

Gran, M., J. Carrera, S. Olivella, and M. W. Saaltink. "Modeling evaporation processes in a saline soil from saturation to oven dry conditions." Hydrology and Earth System Sciences Discussions 8, no. 1 (2011): 529–54. http://dx.doi.org/10.5194/hessd-8-529-2011.

Повний текст джерела

Анотація:

Abstract. Thermal, suction and osmotic gradients interact during evaporation from a salty soil. Vapor fluxes become the main water flow mechanism under very dry conditions. A coupled nonisothermal multiphase flow and a reactive transport model of a salty sand soil was developed to study such an intricate system. The model was calibrated with data from an evaporation experiment (volumetric water content, temperature and concentration). The retention curve and relative permeability functions were modified to simulate oven dry conditions. Experimental observations were satisfactorily reproduced,

Стилі APA, Harvard, Vancouver, ISO та ін.

8

Maheswaran, P. A., S. Satheesh Kumar, and T. Pradeep Kumar. "Intra annual Variability of the Arabian Sea high salinity water mass in the South Eastern Arabian Sea during 2016 17." Defence Science Journal 69, no. 2 (2019): 149–55. http://dx.doi.org/10.14429/dsj.69.14217.

Повний текст джерела

Анотація:

Intra-annual variability of the Arabian Sea high salinity water mass (ASHSW) in the South Eastern Arabian Sea (SEAS) and Gulf of Mannar (GoM) are addressed in this paper by utilisng the monthly missions carried out onboard INS Sagardhwani during 2016-17. Our observations revealed that the ASHSW was evident along the SEAS irrespective of seasons, whereas in the GoM the presence of ASHSW was observed during winter. The processes such as downwelling/up-welling, coastal currents, intrusion of low saline waters, stratification are clearly affects the spreading of the ASHSW. The characteristics such

Стилі APA, Harvard, Vancouver, ISO та ін.

9

Sánchez, G., and F. Méndez. "Power generation cell driven by osmotic pressure in microchannels with hydrophobic surfaces and viscoelectric effects." Journal of Physics D: Applied Physics 55, no. 25 (2022): 255501. http://dx.doi.org/10.1088/1361-6463/ac5ef1.

Повний текст джерела

Анотація:

Abstract A theoretical study that explores power generation via streaming potential and osmotic gradients is proposed. The system is compounded by an osmotic membrane that has different saline concentrations on each side. This concentration gradient promotes a volumetric flux rate inside a microchannel with parallel plates whose surfaces are made of modified hydrophobic fumed silica, thus, the no-slip condition is no longer sustained. Aside from these characteristics, we consider viscoelectric effects in the analysis. The set of equations is written in dimensionless variables, which are solved

Стилі APA, Harvard, Vancouver, ISO та ін.

10

Arenson, Lukas U., and Dave C. Sego. "The effect of salinity on the freezing of coarse-grained sands." Canadian Geotechnical Journal 43, no. 3 (2006): 325–37. http://dx.doi.org/10.1139/t06-006.

Повний текст джерела

Анотація:

Unfrozen water is very important because it has a significant influence on the mechanical response of a frozen soil. It is particularly important to know if the water is available as free water or if it is bonded to the solid particles. A simple experimental setup was used to observe the freezing process of a coarse-grained soil under controlled freezing gradients and salinities. A fluorescent tracer helped to determine the location of the unfrozen water during freezing. Depending on the salinity and the thermal gradient, pockets of unfrozen water with a much higher salt concentration were tra

Стилі APA, Harvard, Vancouver, ISO та ін.

Дисертації з теми "Gradient salin"

1

Wu, Nan. "Capacitive reverse electrodialysis cells for osmotic energy harvesting : Toward real brines and power enhancement." Electronic Thesis or Diss., Université Paris sciences et lettres, 2024. http://www.theses.fr/2024UPSLS019.

Повний текст джерела

Анотація:

Face aux problèmes de réchauffement climatique, trouver des ressources énergétiques propres et durables pour remplacer les combustibles fossiles conventionnels est d'une importance capitale. L'énergie osmotique demeure une ressource énergétique inexploitée avec un potentiel significatif. Dans ce travail, nous parvenons à une conversion efficace de l'énergie osmotique en électricité grâce à un processus de mélange bien contrôlé utilisant un système d'électrodialyse inverse capacitif (CRED). Il est démontré qu'un écart substantiel de densité de puissance existe entre le système CRED et la valeur

Стилі APA, Harvard, Vancouver, ISO та ін.

2

Lavaine, Catherine. "Evaluation des capacités biotechniques de boutures de Salicaceae et Tamaricaceae sur un gradient de sécheresse." Phd thesis, Ecole normale supérieure de lyon - ENS LYON, 2013. http://tel.archives-ouvertes.fr/tel-00969038.

Повний текст джерела

Анотація:

Le phénomène naturel d'érosion des berges peut menacer des infrastructures humaines. Des protections végétales peuvent être installées afin de mimer les dynamiques de végétation et armer la berge grâce aux racines. Cependant, les changements climatiques globaux sont susceptibles d'entraîner et d'aggraver les sécheresses, ce qui va stresser les végétaux présents et compromettre la bonne réussite des ouvrages de génie végétal. La principale question est donc " Quelles sont les caractéristiques biotechniques et les facultés d'acclimatation à la sécheresse de boutures de Salicaceae et Tamaricaceae

Стилі APA, Harvard, Vancouver, ISO та ін.

3

Douar, Adnane. "Recherche de matériaux isolants pour la conception d'une nouvelle génération de connecteurs électriques haute tension : influence de la pollution sur les phénomènes de décharges partielles du contournement et de claquage." Thesis, Ecully, Ecole centrale de Lyon, 2014. http://www.theses.fr/2014ECDL0046/document.

Повний текст джерела

Анотація:

Dans le présent travail, nous abordons une problématique essentielle liée aux accessoires des lignes électriques et plus particulièrement au connecteur à perforation d’isolant (TTDC 45501 FA), commercialisé par la société Sicame située à Arnac-Pompadour (Corrèze). Ce produit permet d’effectuer des dérivations de courant en moyenne tension gainé HTA entre 15 et 25kV. Cependant, il devient nécessaire de concevoir une nouvelle génération de connecteurs capable de fonctionner à une tension de 52 kV en raison de la constante augmentation des besoins en électricité. En réalité, le principal souci co

Стилі APA, Harvard, Vancouver, ISO та ін.

4

Latreille, Anne. "Diversité et adaptation des arbres forestiers : analyse de gradients altitudinaux et de transplantations croisées chez le sapin pectiné." Thesis, Aix-Marseille, 2017. http://www.theses.fr/2017AIXM0012/document.

Повний текст джерела

Анотація:

Les populations répondent aux variations de l'environnement par une adaptation dans un premier temps plastique puis, à plus long terme, génétique. Cette faculté à évoluer est aujourd'hui confrontée à un changement climatique à la fois très rapide et de grande ampleur. L'étude de 15 provenances de sapin pectiné (Abies alba Mill.) réparties sur trois gradients altitudinaux (~ 900 à 1600 m) nous a permis d'évaluer par des approches de dendroécologie et de génétique quantitative leurs caractéristiques phénotypiques et génétiques ainsi que leur potentiel d’acclimatation et d’adaptation. La croissan

Стилі APA, Harvard, Vancouver, ISO та ін.

5

Gilstrap, Matthew Coleman. "Renewable electricity from salinity gradients using reverse electrodialysis." Thesis, Georgia Institute of Technology, 2013. http://hdl.handle.net/1853/49031.

Повний текст джерела

Анотація:

Renewable power generation from the controlled mixing of sea and fresh water is relatively unexplored when compared to the development for solar, wind, and other sustainable power alternatives. When global river discharge was taken into account, an estimated 2.6 TW of obtainable energy exists in untapped salinity gradients. Reverse electrodialysis is one proposed power-generating mechanism for harnessing energy from brackish environments and relies on the transport of aqueous salt ions through an apparatus of ion-exchange membranes. In this thesis, operational parameters, including flow direct

Стилі APA, Harvard, Vancouver, ISO та ін.

6

Pinheiro, Marta Cristhiany Cunha. "AvaliaÃÃo de trÃs mÃtodos coproscÃpicos para diagnÃstico da esquistossomose mansÃnica em Ãrea de baixa endemicidade no Estado do CearÃ." Universidade Federal do CearÃ, 2010. http://www.teses.ufc.br/tde_busca/arquivo.php?codArquivo=5113.

Повний текст джерела

Анотація:

CoordenaÃÃo de AperfeiÃoamento de Pessoal de NÃvel Superior<br>A Esquistossomose MansÃnica Ã uma doenÃa endÃmica em 76 paÃses e territÃrios. Em meados de 2003, calculou-se que 779 milhÃes de pessoas estavam dentro da populaÃÃo de risco para esquistossomose, e 207 milhÃes de pessoas estavam infectadas. O diagnÃstico laboratorial dessa parasitose pode ser realizado atravÃs de mÃtodos parasitolÃgicos de fezes, desde os mais clÃssicos (Kato-Katz), a alguns que ainda estÃo em fase de validaÃÃo. Este estudo foi realizado para avaliar dois novos mÃtodos coproscÃpicos para diagnÃstico da Esquistossomo

Стилі APA, Harvard, Vancouver, ISO та ін.

7

Gamache, Isabelle. "Structure spatiale d'une population d'arbustes dioïques, Salix planifolia, le long d'un gradient successionnel en milieu dunaire subarctique." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1997. http://www.collectionscanada.ca/obj/s4/f2/dsk2/ftp04/mq26208.pdf.

Повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

8

Rosa, Inês Correia. "Ecologia de Atherina spp. ao longo do gradiente salino do canal de Mira (Ria de Aveiro)." Master's thesis, Universidade de Aveiro, 2008. http://hdl.handle.net/10773/780.

Повний текст джерела

Анотація:

Mestrado em Ecologia, Biodiversidade e Gestão de Ecossistemas<br>As espécies Atherina boyeri Risso, 1810 e Atherina presbyter Cuvier, 1829, apesar de apresentarem características merísticas e morfométricas distintas, são por vezes difíceis de distinguir (nomeadamente em casos onde os peixes são pequenos ou estão danificados). Estas duas espécies apresentam também comportamento e ecologia distintos: A. presbyter é tipicamente marinha, podendo estar presente nas áreas mais salinas dos estuários, A. boyeri pode completar todo o seu ciclo de vida em água doce ou salobra sendo o seu comportamento n

Стилі APA, Harvard, Vancouver, ISO та ін.

9

Bessa, Michele Campos. "Estabelecimento de plantas nativas da caatinga em um gradiente de salinidade do solo, sob condições controladas." reponame:Repositório Institucional da UFC, 2012. http://www.repositorio.ufc.br/handle/riufc/18139.

Повний текст джерела

Анотація:

BESSA, Michele Campos. Estabelecimento de plantas nativas da caatinga em um gradiente de salinidade do solo, sob condições controladas. 2012. 89 f. Dissertação (Mestrado em engenharia agrícola)- Universidade Federal do Ceará, Fortaleza-CE, 2012.<br>Submitted by Elineudson Ribeiro (elineudsonr@gmail.com) on 2016-06-24T19:33:22Z No. of bitstreams: 1 2012_dis_mcbessa.pdf: 6573208 bytes, checksum: 0fe38afd0ca62eb037f31aa8314dc0ed (MD5)<br>Approved for entry into archive by José Jairo Viana de Sousa (jairo@ufc.br) on 2016-07-04T23:33:59Z (GMT) No. of bitstreams: 1 2012_dis_mcbessa.pdf: 6573208 byte

Стилі APA, Harvard, Vancouver, ISO та ін.

10

Olivella, Pastallé Sebastià. "Nomsothermal multiphase flow of brine and gas through saline media." Doctoral thesis, Universitat Politècnica de Catalunya, 1995. http://hdl.handle.net/10803/6261.

Повний текст джерела

Анотація:

Presentamos una formulación nueva para el análisis de problemas Termo-hidro-mecánicos en medios salinos. Esta formulación incluye, desde la obtención de ecuaciones de balance de masa, momento y energía hasta su resolución numérica, incluyendo la derivación de algunas ecuaciones constitutivas. El programa de calculo resultante (Code Bright) puede usarse para analizar problemas reales de sistemas de sellado construidos con agregados porosos de sal, que era la motivación original de este trabajo.<br/><br/>Las ecuaciones de balance se han formulado teniendo en cuenta que en un medio salino existen

Стилі APA, Harvard, Vancouver, ISO та ін.

Книги з теми "Gradient salin"

1

Cipollina, Andrea, and Giorgio Micale. Sustainable Energy from Salinity Gradients. Elsevier Science & Technology, 2016.

Знайти повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

2

Sustainable Energy from Salinity Gradients. Elsevier Science & Technology, 2016.

Знайти повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

3

Güereca, Leonor Patricia, Sergio Agustín Zamorano Guzmán, Rosario León-Lira, et al. Guide for the Development of Life Cycle Analysis of Ocean Energies. EPOMEX-UAC, 2021. http://dx.doi.org/10.26359/epomex.cemie082021.

Повний текст джерела

Анотація:

El incremento de la demanda energética a nivel mundial, en conjunto con el calentamiento global y la limitada disponibilidad de combustibles fósiles, han detonado el desarrollo tecnológico y la innovación en el sector energético a nivel mundial, buscando cada vez fuentes de energía más eficientes y con menores impactos ambientales. En este sentido, la energía del océano podría ser una fuente viable, ya que se ha estimado que la energía producida por las olas podría eventualmente proveer un porcentaje importante de la demanda eléctrica mundial actual. Una de las principales ventajas ambientales

Стилі APA, Harvard, Vancouver, ISO та ін.

Частини книг з теми "Gradient salin"

1

Herbst, David B. "Gradients of salinity stress, environmental stability and water chemistry as a templet for defining habitat types and physiological strategies in inland salt waters." In Saline Lakes. Springer Netherlands, 2001. http://dx.doi.org/10.1007/978-94-017-2934-5_19.

Повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

2

Castagna, S., S. Olivella, A. Lloret, and E. E. Alonso. "Experimental and Numerical Investigation of Porosity Variations in Saline Media Induced by Temperature Gradients." In Computational Methods for Flow and Transport in Porous Media. Springer Netherlands, 2000. http://dx.doi.org/10.1007/978-94-017-1114-2_22.

Повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

3

Mead, Gregory A., David A. Hodell, and Paul F. Ciesielski. "Late Eocene to Oligocene vertical oxygen isotopic gradients in the South Atlantic: Implications for warm saline deep water." In The Antarctic Paleoenvironment: A Perspective on Global Change: Part Two. American Geophysical Union, 1993. http://dx.doi.org/10.1029/ar060p0027.

Повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

4

Naftalovich, Rotem, and Daniel Denis. "Fluid Management in Neurosurgery." In Advanced Anesthesia Review, edited by Alaa Abd-Elsayed. Oxford University PressNew York, 2023. http://dx.doi.org/10.1093/med/9780197584521.003.0071.

Повний текст джерела

Анотація:

Abstract Fluid movement within capillaries can be conceptualized by the oncotic gradient model as per the Starling law. The blood-brain barrier in the central nervous system begets the osmotic gradient as the primary driving force. The goal of fluid management during neurosurgery should be euvolemia to maintain cerebral perfusion pressure and intravascular volume using iso-osmolar crystalloids. Hypo-osmolar solutions should generally be avoided to prevent worsening cerebral edema. Hyperosmolar solutions such as mannitol and hypertonic saline can be used to preferentially draw free water from the interstitial space into the vasculature, decreasing cerebral edema and improving surgical exposure. Glucose-containing solutions should be avoided as hyperglycemia is associated with worse neurological outcomes. Prevention of vasospasm in subarachnoid hemorrhage can be managed medically with nimodipine and fluid management, with hemodynamic goals favoring perfusion. This can be achieved by the traditional “triple H” therapy of hypervolemia, hypertension, and hemodilution, but care must be taken to avoid hypervolemia-related side effects: pulmonary edema, myocardial ischemia (from increased afterload), and hyponatremia. Traumatic brain injury patients can present with significant hemodynamic instability, which further complicates their resuscitation.

Стилі APA, Harvard, Vancouver, ISO та ін.

5

Boubakri, Ali, Salah Al-Tahar Bouguecha, and Amor Hafiane. "Membrane distillation process: Fundamentals, applications, and challenges." In Solvents - Dilute, Dissolve, and Disperse [Working Title]. IntechOpen, 2024. http://dx.doi.org/10.5772/intechopen.1002375.

Повний текст джерела

Анотація:

Traditional thermal-based processes such as multistage flash and multi-effect distillation have been used for thousands of years to obtain freshwater from saline water. Recently, with the development of membrane-based technology, membrane distillation (MD) as a thermally driven membrane process has received significant attention. The driving force in MD is the vapor pressure gradient induced by temperature difference through hydrophobic microporous membrane pores. The membrane used for MD should be hydrophobic and microporous. In MD, the mechanism of transport involves simultaneously heat and mass transfers, which moves from the hot feed side to the cold permeate side. The performance of MD is evaluated based on various performance metrics including permeate flux, recovery ratio, thermal efficiency, gained output ratio, and specific thermal energy consumption. It has good ability for various industrial uses due to its moderate applied temperature and pressure, high rejection rate, less membrane fouling tendency and its ability to treat high-saline water. The water production cost still remains high compared to conventional processes. Therefore, MD can be cost-effectively when integrated with solar energy, geothermal energy and waste heat. Nevertheless, MD process requires focused research to improve its efficiency to become more mature and economically competitive at large scale.

Стилі APA, Harvard, Vancouver, ISO та ін.

6

Hedenquist, Jeffrey W., Yukihiro Matsuhisa, Elji Izawa, Noel C. White, Werner F. Giggenbach, and Masahiro Aoki. "Economic Geology and the Bulletin of the Society of Economic Geologists." In Epithermal Gold Mineralization and Modern Analogues, Kyushu, Japan. Society of Economic Geologists, 2001. http://dx.doi.org/10.5382/gb.34.10.

Повний текст джерела

Анотація:

Abstract The Nansatsu district of southern Kyushu has been the site of calc-alkaline volcanism for the last 10 m.y., shifting eastward with time. Associated hydrothermal activity followed deposition of the volcanic host rocks by about 0.5 m.y. and was characterized by interaction of magmatic fluids with meteoric water under epithermal conditions, resulting in the formation of high sulfidation Cu-Au deposits at Kasuga, Iwato, and Akeshi. The orebodies consist of &gt;95 wt percent SiO2 and result from leaching of the original andesite lava and pyroclastic flows by acid chloride-sulfate waters. These are inferred to have formed when magmatic vapors containing HCl and SO2 condensed into meteoric water. The residual silica (now quartz) orebodies are best developed where the host was initially permeable. The margins of the quartz bodies are abrupt, with narrow (1-2 m) halos representing the reaction front of acid waters isochemically dissolving the host rock. The halo comprises alunite (strongly zoned in Na and K, with P-rich cores), dickite, and/or kaolinite ± pyrophyllite, grading out into illite and interlayered illite-smectite clays, and finally, propylitic alteration. This pattern is characteristic of deposits of this type throughout the world, for example, at Summitville, Colorado, and Lepanto, Philippines. Mineralization occurred after initial leaching by the vapor condensates, with metals transported by a dense magmatic fluid. Mixing with meteoric water and the subsequent temperature decrease caused the general decrease in grade toward the margin of the quartz bodies; ore grades are restricted to the quartz bodies. Gold is most closely associated with enargite and pyrite; later minerals include covellite and then sulfur. The last stage of activity was steam-heated, with descending waters oxidizing sulfides to goethite and locally remobilizing Au into fractures (this varies in degree between deposits). Erosion exposed the orebodies to supergene weathering, continuing the sulfide oxidation and Au remobilization. Stable isotope results indicate that hypogene alunite formed from a mixture of magmatic fluid (δ18O = 7 ± 2‰, δD = −25 ± 5‰, similar to nearby active volcanic discharges) with local meteoric water. In contrast, the clays in the marginal halo have isotopic compositions indicating a δ18O shift of 6 to 8 per mil from local meteoric water values, probably due to water-rock interaction, and the δ18O values of residual silica quartz may also be due to meteoric water domination. Fluid inclusion study of postmineralization quartz crystals indicates that the fluids had a salinity of about 1 wt percent NaCl equiv during late quartz growth, though there is evidence in one sample for higher salinity fluid having been present, up to 30 wt percent NaCI equiv (some inclusions contain daughter minerals of halite and sulfur). The Th values of over 1,000 measurements on late quartz from the ore zones indicate that the mean temperature during that stage ranged from &lt;200°C at Akeshi to about 200°C at Iwato and 230°C at Kasuga. The presence of vapor-rich inclusions, some with Thv similar to Thl, indicate the presence at times of a two-phase fluid in the center of the ore zones, with depths of about 150 to 300 m below the paleowater table. The mineralizing fluid was relatively oxidized (sulfide/ sulfate ratio about 3:1), close to pyrite-alunite coexistence. Under these redox conditions, a pH of 3 and over a temperature range of 200° to 300°C, AuCl2− complexing may dominate over HAu(SH)2 at salinities above about 2 wt percent NaCl. Several conditions are conducive for high sulfidation mineralization to occur: a crystallizing magma exsolves a fluid, with lower pressure conditions favoring metal fractionation from melt to fluid,the exsolved fluid separates into vapor and saline liquid phases due to immiscibility, with the latter being metal rich,the gas-rich (HCl and SO2 + H2S) vapor ascends to the surface, with at least a portion condensed into meteoric water, forming an acid fluid which leaches the host rock to create permeable zones for later mixing, andthe dense, metal-bearing fluid also ascends into this leached zone and precipitates Cu sulfosalts, sulfides, and Au upon mixing with meteoric water. If the saline liquid is not released from its source adjacent to the magma, due to lack of fracturing, or if there is a strong hydraulic gradient caused by high relief, only the vapor-related stage may occur. This will leave leached, barren rock which is characteristic of many eroded volcanic terranes.

Стилі APA, Harvard, Vancouver, ISO та ін.

7

Fastie, Christopher L., and Robert A. Ott. "Successional Processes in the Alaskan Boreal Forest." In Alaska's Changing Boreal Forest. Oxford University Press, 2006. http://dx.doi.org/10.1093/oso/9780195154313.003.0012.

Повний текст джерела

Анотація:

Superimposed on the topographic and climatic gradients in vegetation described in Chapter 6 are mosaics of stands of different ages reflecting the interplay between disturbance and succession, that is, the ecosystem changes that follow disturbance. The nature of disturbance governs vegetation succession, and vegetation properties, in turn, influence disturbance regime. Both disturbance and succession are controlled by state factors and by stochastic variation in local conditions such as weather and the abundance of herbivores. Even in this relatively simple biome, the interactions among site, chance, and disturbance history result in a vast array of possible successional trajectories following a disturbance event, generating at least 30 forest types in interior Alaska (Viereck et al. 1992). Despite this broad range of possible dynamics, certain patterns recur more frequently than others (Drury 1956, Viereck 1970). In this chapter, we discuss selected successional pathways that commonly occur on river floodplains and on permafrost-free or permafrost-dominated upland sites in interior Alaska. River floodplains occupy only 17% of interior Alaska, but they account for 80% of the region’s commercial forests and therefore have attracted considerable attention from forest managers (Adams 1999). These forests provide an excellent example of primary succession, that is, the succession that occurs on surfaces that have not been previously vegetated. Although many successional pathways are possible on interior Alaska’s floodplains (Fig. 7.1; Drury 1956), the trajectory that actually occurs in a particular place is usually determined by the patterns of colonization during the first decades (Egler 1954). This, in turn, depends primarily on physical environment, flood events, and seed availability. For example, fine-textured sediments, which are common along the gradual grade of the Tanana River near Fairbanks (Chapter 3), retain more moisture than gravelly substrates and favor establishment of thinleaf alder (Alnus incana subsp. tenuifolia) following the initial colonization by willow (Salix). Alder is therefore a more important component of this successional sequence than along some other rivers. In this chapter, we focus on the alder-mediated pattern of floodplain succession, which has been the major focus of the LTER research program. The common and scientific names of species mentioned in this chapter are given in Table 6.1.

Стилі APA, Harvard, Vancouver, ISO та ін.

8

"Balancing Fisheries Management and Water Uses for Impounded River Systems." In Balancing Fisheries Management and Water Uses for Impounded River Systems, edited by Tim Patton and Cris Lyday. American Fisheries Society, 2008. http://dx.doi.org/10.47886/9781934874066.ch11.

Повний текст джерела

Анотація:

<em>Abstract</em>.—While processes of depositional filling and ecological succession in natural lakes have been well described, these concepts are relatively new and seldom applied to reservoirs, especially at the landscape scale. However, ecological time has been sufficient to allow us to see successional processes in many reservoir systems. Illustrative of such processes, Lake Texoma is a 36,000-ha reservoir located in southern Oklahoma and northern Texas, and patterns of depositional filling and subsequent processes are apparent in the up-lake ends (there are two large-river tributaries) of this system. Completed in 1944, Lake Texoma has a drainage area of more than100,000 km2, most of which is highly erodable agricultural lands. We used historic aerial photographs, geographic information systems technology, and field measurements to examine a variety of surface and habitat features and analyzed experimental gill-net samples using ordination techniques to characterize the fish communities in portions of the reservoir most affected by sedimentation. Extensive sedimentation and accretion of sediments above water level has effectively resulted in surface area reduction, cove isolation, fragmentation of lacustrine habitats, morphometric changes, and establishment of terrestrial vegetation on newly deposited lands. Most notably, sedimentation has led to the development of linear bars of deposition above normal pool elevation that have blocked mouths of coves, bisected large areas of the reservoir, and fragmented several pools. In our study site alone, 332 ha (surface area) of reservoir has experienced accretion of land above the water level. Reservoir fragments had lower shoreline development values (mean = 2.21) than comparable control sites (mean = 3.39). Depositional shorelines associated with sedimentation exhibited lower gradients than nondepositional shorelines (mean = 2.0% versus 4.2%, respectively), and habitat heterogeneity was lower along depositional shorelines than along nondepositional shorelines. Fish communities in isolated reservoir fragments appeared to be distinct from fish communities in nonfragmented habitats. This change in community structure may be driven by an appreciable reduction of pelagic species from fragmented sites, as these sites have limited or no connectivity to the main body of the reservoir. With respect to the newly deposited lands, ecological succession of vegetation followed a progression from mud flats to dense, nearly monotypic stands of black willow Salix nigra forests within a few years. These habitat changes had strong implications to the fish communities as well as to adjacent terrestrial wildlife communities and will likely pose many challenges, and perhaps opportunities, for natural resource managers.

Стилі APA, Harvard, Vancouver, ISO та ін.

9

Sai Sri Harsha, G., D. Chinna Babu, Vijeta Bhattacharya, Namrata Mishra, Neha Chopra, and R. Jayasree. "(INJ. IRON SUCROSE) INDUCED ANAPHYLACTIC SHOCK – A DETAILED CASE REPORT." In Futuristic Trends in Pharmacy & Nursing Volume 3 Book 4. Iterative International Publishers, Selfypage Developers Pvt Ltd, 2024. http://dx.doi.org/10.58532/v3bipn4p1ch2.

Повний текст джерела

Анотація:

Background: Anemia is the leading cause of disability worldwide, and many groups of patients need iron supplementation (e.g. patients with renal failure, those with inflammatory bowel disease, and pregnant women among others). Intravenous iron administration is an effective method of treating iron deficiency anemia, but there have been concerns about adverse side effects, particularly serious events such as anaphylactic reactions. Anaphylaxis is a serious life-threatening and systemic allergic or hypersensitivity reaction with immediate onset. Management of anaphylaxis in pregnancy is similar to that in nonpregnant women. The recommendations for the management of acute anaphylactic episodes include immediate cessation of the triggering factors, airway and BP support, prevention of hypoxia with 100% oxygen, aggressive fluid resuscitation with normal saline, and various medications, such as epinephrine, antihistamines, and corticosteroids. Case Presentation: A 21-year-old female patient G3P2L2 with 8MA with anemia. Given Anaemia (Hb:8g/dl) patient went to a local hospital and Inj. Iron Sucrose was given. After 2 hours of Injection patient developed Angioedema, Headache, Vomiting, and Giddiness. After basic supportive management, she was sent to a district hospital where supportive management was given. Given worsening of blood pressure she was brought to SVIMS for further evaluation and management. The patient presented to the Emergency Medicine department with complaints of facial (lip) swelling, neck swelling, shortness of breath-grade II-III NYHA, and profuse sweating. On general examination, her BP was found to be decreased i.e. 90/50 mm of hg and her pulse rate was 110 beats per minute. Laboratory Examinations revealed decreased levels of Hb, RBC, PCV, MCV, MCH, Lymphocytes, and Serum potassium. Her WBC, ESR, and Neutrophil count were found to be increased. The patient was diagnosed with Iron Sucrose (Inj.) induced Anaphylactic Shock. Inj.HYDROCORTISONE-100mg-IV-STAT, Inj.AVIL-25mg-IV-STAT, Inj. EMESET-4mg-IV-STAT, Inj.PANTOP-40mg-IV-STAT was given to treat the patient. Conclusion: Our findings suggested that Hypersensitivity reactions to IV iron are rare but potentially life-threatening. They are at least partly preventable by the implementation of risk minimization measures. Their management requires prompt recognition and grading of severity, together with meticulous monitoring and immediate treatment.

Стилі APA, Harvard, Vancouver, ISO та ін.

Тези доповідей конференцій з теми "Gradient salin"

1

Riza, Lala Septem, Muhammad Aziz Ashari, and Rani Megasari. "The Implementation of Gradient Descent Based Methods Using Parallel Computing in R for Regression Tasks." In 2018 International Symposium on Advanced Intelligent Informatics (SAIN). IEEE, 2018. http://dx.doi.org/10.1109/sain.2018.8673361.

Повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

2

Emdadi, Arash, Yunus Emami, Mansour Zenouzi, et al. "Potential of Electricity Generation by the Salinity Gradient Energy Conversion Technologies in the System of Urmia Lake-Gadar Chay River." In ASME 2014 8th International Conference on Energy Sustainability collocated with the ASME 2014 12th International Conference on Fuel Cell Science, Engineering and Technology. American Society of Mechanical Engineers, 2014. http://dx.doi.org/10.1115/es2014-6310.

Повний текст джерела

Анотація:

Energy production from salinity gradients is one of the developing renewable energy sources, and has significant potential for satisfying electrical demands. Urmia Lake is the second hyper-saline lake in the world and there is a significant salinity gradient between the lake’s water and the waters of those rivers that flow into the lake. A methodology for determining the feasibility for electrical production using Salinity Gradient Power (SGP) is developed for two different types of systems using this location as an example. Reverse Electrodialysis (RED) and Pressure Retarded Osmosis (PRO), Th

Стилі APA, Harvard, Vancouver, ISO та ін.

3

Ballesteros Rozo, L. T. "Energetic Potential of the Saline Gradient in the Bay of Cartagena in the Colombian Caribbean." In First EAGE Online Workshop on Water Footprint. European Association of Geoscientists & Engineers, 2023. http://dx.doi.org/10.3997/2214-4609.202383001.

Повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

4

Ding, Lei, AbdulKareem M. AlSofi, Muhammad M. AlMajid, and Pramod Patil. "CO2 Soluble Surfactants Assisted Carbon Storage Under Achievable Pressure Gradients: Effect of Surfactant Partitioning Behavior During Continuous CO2 Injection." In International Petroleum Technology Conference. IPTC, 2024. http://dx.doi.org/10.2523/iptc-23958-ms.

Повний текст джерела

Анотація:

Abstract Injecting CO2 into the saline aquifers normally suffers from low sweep efficiency due to the smaller density and viscosity of CO2 compared to brine. The potential of CO2 soluble surfactants assisted carbon storage in carbonate formations was first evaluated by core flooding tests (at 65°C, 150 bar & 90,000 TDS) in Indiana Limestone at different gas fractions, where the surfactants were injected with the CO2 phase (CCI+S). The pressure gradients and CO2 saturation were continuously monitored during the coreflooding tests. It was found that foam was generated during CCI+S when 0.07

Стилі APA, Harvard, Vancouver, ISO та ін.

5

Saundry, R. H., P. Kopp, and G. F. Savidge. "THE INTERACTION OF THE FACTOR VIII/vWF COMPLEX WITH IMMOBILISED METAL AFFINITY CHROMATOGRAPHY (IMAC) MATRICES." In XIth International Congress on Thrombosis and Haemostasis. Schattauer GmbH, 1987. http://dx.doi.org/10.1055/s-0038-1644046.

Повний текст джерела

Анотація:

1MAC principles were used to investigate the binding of Factor VIII/vWF from either Al(OH)3 - absorbed citrated PPP or cryoprecipitate using citrate-saline buffers. Factor VIII/ vWF showed high affinity for both Zn2+ - or Cu2+ - immobilised on biscarboxymethylaminoSepharose 4B at ambient room temperature, but no interaction with Ca2+, Mg2+, Mn2+ or Cd2+ - immobilised matrices.Factor VIII/vWF could be re-eluted as a single component from Zn2+ - columns using either decreasing pK, or increasing competitor ligandconcentrations. In pK gradients comprising 14mM citrate, 2.14mM CaCl2, 0.15m NaCl Fac

Стилі APA, Harvard, Vancouver, ISO та ін.

6

Penny, G. S., S. M. Bhagwat, C. E. Shuchart, and V. P. Gupta. "Improving Injectivity of CO2 in Saline Aquifers Through Chemical Additives." In SPE Annual Technical Conference and Exhibition. SPE, 2024. http://dx.doi.org/10.2118/220743-ms.

Повний текст джерела

Анотація:

Summary A key metric for Carbon Capture and Storage (CCS) projects is the rate of injection of supercritical CO2 (sCO2) into the subsurface and maximizing injectivity will be important for success. The sCO2 injection rate into saline aquifers is limited by formation permeability and residual water saturation held in place by capillary pressure. The objective of this work is to explore the application of additives to lower the capillary pressure and the water saturation in the near wellbore region and thereby increase the relative permeability to sCO2. The intended benefit will be the ability t

Стилі APA, Harvard, Vancouver, ISO та ін.

7

Tom, Imaobong, Quang M. Nguyen, and Mustafa Onur. "Performance Comparison of Gradient-Free Optimization Methods for Well Placement and Well Controls Optimization for Geologic CO2 Storage." In SPE Europe Energy Conference and Exhibition. SPE, 2024. http://dx.doi.org/10.2118/220026-ms.

Повний текст джерела

Анотація:

Abstract Population-based (gradient-free) methods have become attractive for solving optimization problems since they have been known to locate "optimal" (best) positions within a search space. In this study, we investigate the use of three different gradient-free optimization methods namely: Iterative Latin Hypercube Sampling (ILHS), Particle Swarm Optimization (PSO), and Genetic Algorithm (GA) for well placement and well controls optimization problem of the CO2 underground storage in a 2D saline aquifer with bound constraints on the design variables. We also consider sequential optimization

Стилі APA, Harvard, Vancouver, ISO та ін.

8

Wijaya, Nur, Derek Vikara, David Morgan, Timothy Grant, and Donald Remson. "Basin Management of Geologic CO2 Storage: Effect of Well Spacing on CO2 Plume and Pressure Interference." In SPE Western Regional Meeting. SPE, 2022. http://dx.doi.org/10.2118/209283-ms.

Повний текст джерела

Анотація:

Abstract Large-scale deployment of carbon capture and storage (CCS) is a key decarbonization approach to achieve drastic reductions in greenhouse gas emission levels. The United States Department of Energy's National Energy Technology Laboratory, through the Carbon Storage Assurance Facility Enterprise Initiative projects, defines a commercial-scale CO2 saline storage project as one in which at least 50 million tonnes of CO2 are injected over the course of 20 to 30 years. Large-scale decarbonization through CCS may likely involve many commercial-scale CO2 storage projects located in close prox

Стилі APA, Harvard, Vancouver, ISO та ін.

9

Abd El-Aziz, Khalid M., Karim Hamza, Mohamed El Morsi, Ashraf O. Nassef, Sayed M. Metwalli, and Kazuhiro Saitou. "Optimum Solar HDH Desalination for Semi-Isolated Communities Using HGP and GA’s." In ASME 2014 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. American Society of Mechanical Engineers, 2014. http://dx.doi.org/10.1115/detc2014-34598.

Повний текст джерела

Анотація:

Modeling and unit-cost optimization of a water-heated humidification-dehumidification (HDH) desalination system were presented in previous work of the authors. The system controlled the saline water flow rate to prevent salts from precipitating at higher water temperatures. It was then realized that this scheme had a negative impact on condensation performance when the controlled flow rate was not sufficiently high. This work builds on the previous system by disconnecting the condenser from the saline water cycle and by introducing a solar air heater to further augment the humidification perfo

Стилі APA, Harvard, Vancouver, ISO та ін.

10

Pisarski, Pawel, Ilia Chaikine, Alexey Romanov, Richard Holst, and Richard Hares. "De-Risking of Early-Stage Saline Aquifer CO2 Sequestration Projects Using a Data-Driven Approach." In SPE Canadian Energy Technology Conference and Exhibition. SPE, 2023. http://dx.doi.org/10.2118/212804-ms.

Повний текст джерела

Анотація:

Abstract Early-stage saline aquifer CO2 sequestration projects are filled with uncertainty and often pose a challenge for decision makers. The industry-standard saline aquifer suitability screening checklists provide limited insight into sequestration opportunity high-grading and development planning. Detailed full-field geological and numerical simulation modelling can be prohibitively expensive in the initial project scoping stage. Here we present an alternative data-driven approach to assist in early-stage CO2 sequestration project scoping. A developed machine learning model ties geological

Стилі APA, Harvard, Vancouver, ISO та ін.

Ми пропонуємо знижки на всі преміум-плани для авторів, чиї праці увійшли до тематичних добірок літератури. Зв'яжіться з нами, щоб отримати унікальний промокод!