Relevant bibliographies by topics / Extra large pore

Academic literature on the topic 'Extra large pore'

Author: Grafiati
Published: 7 July 2024
Last updated: 7 July 2024

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Contents

  1. Journal articles
  2. Dissertations / Theses
  3. Books
  4. Book chapters
  5. Conference papers

Journal articles on the topic "Extra large pore":

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Kang, Jong Hun, Dan Xie, Stacey I. Zones, and Mark E. Davis. "Transformation of Extra-Large Pore Germanosilicate CIT-13 Molecular Sieve into Extra-Large Pore CIT-5 Molecular Sieve." Chemistry of Materials 31, no. 23 (November 6, 2019): 9777–87. http://dx.doi.org/10.1021/acs.chemmater.9b03675.

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Bhaumik, Asim, Sujit Samanta, and Nawal Kishor Mal. "Highly active disordered extra large pore titanium silicate." Microporous and Mesoporous Materials 68, no. 1-3 (March 2004): 29–35. http://dx.doi.org/10.1016/j.micromeso.2003.12.005.

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Shamzhy, Mariya V., Oleksiy V. Shvets, Maksym V. Opanasenko, Pavel S. Yaremov, Liana G. Sarkisyan, Pavla Chlubná, Arnošt Zukal, V. Reddy Marthala, Martin Hartmann, and Jiří Čejka. "Synthesis of isomorphously substituted extra-large pore UTL zeolites." Journal of Materials Chemistry 22, no. 31 (2012): 15793. http://dx.doi.org/10.1039/c2jm31725g.

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Sarkar, Krishanu, Subhash Chandra Laha, and Asim Bhaumik. "A new extra large pore organic–inorganic hybrid silicoaluminophosphate." J. Mater. Chem. 16, no. 25 (2006): 2439–44. http://dx.doi.org/10.1039/b600989a.

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Lobo, Raul F., Michael Tsapatsis, Clemens C. Freyhardt, Shervin Khodabandeh, Paul Wagner, Cong-Yan Chen, Kenneth J. Balkus, Stacey I. Zones, and Mark E. Davis. "Characterization of the Extra-Large-Pore Zeolite UTD-1." Journal of the American Chemical Society 119, no. 36 (September 1997): 8474–84. http://dx.doi.org/10.1021/ja9708528.

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Davis, Mark E. "The Quest For Extra-Large Pore, Crystalline Molecular Sieves." Chemistry - A European Journal 3, no. 11 (November 1997): 1745–50. http://dx.doi.org/10.1002/chem.19970031104.

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Wang, Yichen, Hongjuan Wang, Yuanchao Shao, Tianduo Li, Takashi Tatsumi, and Jin-Gui Wang. "Direct Synthesis of Ti-Containing CFI-Type Extra-Large-Pore Zeolites in the Presence of Fluorides." Catalysts 9, no. 3 (March 14, 2019): 257. http://dx.doi.org/10.3390/catal9030257.

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Ti-containing zeolites showed extremely high activity and selectivity in numerous friendly environmental oxidation reactions with hydrogen peroxide as a green oxidant. It will be in high demand to synthesize Ti-containing crystalline extra-large-pore zeolites due to the severe restrictions of medium-pore and/or large-pore zeolites for bulky reactant oxidations. However, the direct synthesis of extra-large-pore Ti-zeolites was still challengeable. Here, we firstly report a strategy to directly synthesize high-performance Ti-containing CFI-type extra-large-pore (Ti-CFI) zeolites assisted with fluorides. The well-crystallized Ti-CFI zeolites with framework titanium species could be synthesized in the hydrofluoric acid system with seed or in the ammonium fluoride system without seed, which showed higher catalytic activity for cyclohexene oxidation than that synthesized from the traditional LiOH system.
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Matos, Jivaldo R., Lucildes P. Mercuri, Michal Kruk, and Mietek Jaroniec. "Toward the Synthesis of Extra-Large-Pore MCM-41 Analogues." Chemistry of Materials 13, no. 5 (May 2001): 1726–31. http://dx.doi.org/10.1021/cm000964p.

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Martínez-Franco, Raquel, Cecilia Paris, Manuel Moliner, and Avelino Corma. "Synthesis of highly stable metal-containing extra-large-pore molecular sieves." Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences 374, no. 2061 (February 28, 2016): 20150075. http://dx.doi.org/10.1098/rsta.2015.0075.

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The isomorphic substitution of two different metals (Mg and Co) within the framework of the ITQ-51 zeotype (IFO structure) using bulky aromatic proton sponges as organic structure-directing agents (OSDAs) has allowed the synthesis of different stable metal-containing extra-large-pore zeotypes with high pore accessibility and acidity. These metal-containing extra-large-pore zeolites, named MgITQ-51 and CoITQ-51, have been characterized by different techniques, such as powder X-ray diffraction, scanning electron microscopy, energy dispersive X-ray spectrometry, UV–Vis spectroscopy, temperature programmed desorption of ammonia and Fourier transform infrared spectroscopy, to study their physico-chemical properties. The characterization confirms the preferential insertion of Mg and Co atoms within the crystalline structure of the ITQ-51 zeotype, providing high Brønsted acidity, and allowing their use as efficient heterogeneous acid catalysts in industrially relevant reactions involving bulky organic molecules.
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Gao, Zihao Rei, Salvador R. G. Balestra, Jian Li, and Miguel A. Camblor. "Synthesis of Extra‐Large Pore, Large Pore and Medium Pore Zeolites Using a Small Imidazolium Cation as the Organic Structure‐Directing Agent." Chemistry – A European Journal 27, no. 72 (November 17, 2021): 18109–17. http://dx.doi.org/10.1002/chem.202103288.

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Journal articles

Dissertations / Theses on the topic "Extra large pore":

1

Fayek, Jawad. "Synthesis of Structure Determining Agents (SDAs) for zeolites with extra-large pore size." Electronic Thesis or Diss., Normandie, 2024. http://www.theses.fr/2024NORMC201.

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Les zéolites sont des matériaux poreux cristallins uniformesformés d'unités TO4 partageant un sommet (T = Si, Al, Ge, etc.). Ils sont préparés sous des conditions hydrothermales, en mélangeant un agent directeur de structure (SDA) approprié avec un gel contenant des composants inorganiques tels que la silice, l'alumine ou le germanium. À un pH et une température spécifiques, le SDA induit la nucléation et la croissance cristalline pour obtenir des zéolites de taille, de forme et de dimension spécifiques. Les zéolites à pores de taille extra-large avec une ouverture de pore supérieure à 0,75 nm suscitent un intérêt croissant de la part des chercheurs en raison de leur activité prometteuse dans le traitement de molécules plus volumineuses, de l'amélioration de la vitesse de diffusion, de la prolongation de la durée de vie du catalyseur et du changement de la sélectivité du produit.Notre objectif est de préparer des SDA avec des substitutions alkyliques différentes en suivant une approche d'expansion de taille, en synthétisant des sels d'ammonium contenant une ou deux entités alcyne. De plus, des sels d'ammonium à base d'imidazole, d'hexaméthylénétanétramine et de composés de 4-phénylpyrridine - ainsi que des voies de synthèse pour la préparation de sels d'ammonium à base de [2.2] paracyclophane en utilisant la réaction de King ont été explorées. En outre, des sels organiques à base de phosphore ont été synthétisés. La préparation, la purification et les premiers résultats de leur utilisation comme SDA dans la synthèse des zéolites seront présentés dans cette thèse
Zeolites are uniformly crystalline porous materials formed of a vertex sharing TO4 units (T= Si, Al, Ge, etc.). They are prepared under hydrothermal conditions, by mixing a suitable structure directing agent (SDA) with a gel containing inorganic components such as silica, alumina or germanium. At specific pH and temperature, the SDA induces nucleation, seed formation and crystal growth to obtain zeolites with specific size, shape and dimension. Extra-large pore size zeolites with pore aperture larger than 0.75 nm aroused increasing interest from researchers due to their promising activity in processing bulkier molecules, improving diffusion rate, prolonging the catalyst lifetime and changing product selectivity. Our goal is to prepare SDA’s having different alkyl substituents following size expansion approach, by synthesizing ammonium salts containing either one or two alkyne moieties. Furthermore, ammonium salts based on imidazole, hexamethyl-enetetramine and 4-phenylpyridine compounds – as well as synthetic paths for the preparation of [2.2] paracyclophane based ammonium salts using King’s reaction were explored. Additionally, organic salts based on phosphorous were synthesized. Preparation, purification and preliminary results of their use as SDAs in zeolite synthesis will be shown in this thesis
2

Yoshikawa, Masahito. "Studies on Syntheses of Molecular Sieves Aimed at Extra-Large-Pore Molecular Sieves." Kyoto University, 1999. http://hdl.handle.net/2433/181340.

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Books on the topic "Extra large pore":

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Yi-chong, Xu, and Patrick Weller. Funding International Organizations. Oxford University Press, 2017. http://dx.doi.org/10.1093/oso/9780198719496.003.0006.

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This chapter examines the internal competition and coordination in mobilising resources from regular and extra-budgetary sources at the six IOs. As the traditional assessed contribution from member states to IOs has been by and large fixed and the share of other sources has been expanding, the challenge for IOs is how to manage (a) the contribution from different parts of member states (assessed vs. voluntary contribution), (b) that of member states and non-state contributors, and (c) the participation of non-state bodies in IO activities which pose serious challenges for the head of IOs, the secretariat and member states. It particularly explains the two different types of budget process within IOs: managing the budget and deficit-driven budgeting, and shows why and how they are done.

Book chapters on the topic "Extra large pore":

1

Li, Guowei, Ruyi Liu, Chao Zhao, Yang Zhou, and Li Xiong. "Compaction Effect Due to Single Pile Driving in PHC Pile Treated Soft Clayey Deposit." In Lecture Notes in Civil Engineering, 315–25. Singapore: Springer Nature Singapore, 2023. http://dx.doi.org/10.1007/978-981-99-2532-2_26.

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AbstractThe compaction effect of extra-long prestressed high-strength concrete (PHC) piles in deep soft soil foundation was studied by field test. The pore water pressure gauge, inclinometer were embedded in different plane positions or different depths of the foundation to monitor the pore pressure and deformation of the foundation when driving pile. The research shows that the magnitude of excess pore water pressure caused by single pile installation is mainly related to buried depth of the measuring point and the linear distance between the pile tip and the measuring point. The shorter the distance or the deeper the depth is, the greater the excess pore pressure caused by pile installation. The horizontal influence radius of pile compacting on the pore water pressure is about 10.7 m. The excess pore pressure induced by pile installation increases with depth, and is obviously affected by stratum properties. In the vicinity of soil with high permeability coefficient, such as thin sand layer or silty fine sand layer, the excess pore pressure cannot be accumulated in a large amount. The existing subgrade obviously restricts the lateral deformation of soil between piles and PHC piles. The pile deformation is small at the top and bottom, and large in the middle. The inflection point of the deformation curve appears at the pile connection position. The relationship the excess pore pressure of the measuring point with the depth and distance of the measuring point is given.
2

Davis, Mark E. "Evolution of extra-large pore materials." In Studies in Surface Science and Catalysis, 29–36. Elsevier, 2001. http://dx.doi.org/10.1016/s0167-2991(01)81184-8.

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Burton, A., S. Elomari, C. Y. Chen, T. V. Harris, and E. S. Vittoratos. "SSZ-53 and SSZ-59: Two novel extra-large pore zeolites." In Studies in Surface Science and Catalysis, 126–32. Elsevier, 2004. http://dx.doi.org/10.1016/s0167-2991(04)80792-4.

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Chen, C. Y., and S. I. Zones. "17-P-07 - Investigation of hydrocarbon adsorption on large and extra-large pore zeolites." In Studies in Surface Science and Catalysis, 222. Elsevier, 2001. http://dx.doi.org/10.1016/s0167-2991(01)81451-8.

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Reschetilowski, W., K. Roos, A. Liepold, M. Stöcker, R. Schmidt, A. Karlsson, D. Akporiaye, and E. Myhrvold. "Synthesis and catalytic properties of extra-large pore crystalline materials for n-hexadecane cracking." In Zeolite Science 1994: Recent Progress and Discussions - Supplementary Materials to the 10th International Zeolite Conference, Garmish-Partenkirchen, Germany, July 17-22, 1994, 180–81. Elsevier, 1995. http://dx.doi.org/10.1016/s0167-2991(06)81143-2.

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Chen, C. Y., S. I. Zones, A. W. Burton, S. A. Elomari, and S. Svelle. "Characterization of Large and Extra-large Pore Zeolites via Isomerization and Disproportionation of 1,3-Diisopropylbenzene as a Catalytic Test Reaction." In Science and Technology in Catalysis 2006, 329–32. Elsevier, 2007. http://dx.doi.org/10.1016/b978-0-444-53202-2.50071-3.

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MARTENS, J. A., G. M. VANBUTSELE, and P. A. JACOBS. "CHARACTERIZATION OF LARGE AND EXTRA-LARGE ZEOLITE PORES WITH THE HEPTADECANE TEST." In Proceedings from the Ninth International Zeolite Conference, 355–62. Elsevier, 1993. http://dx.doi.org/10.1016/b978-1-4832-8383-8.50127-6.

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King, Frank H. H. "Extra-Regional Banks and Investment in China." In International Banking 1870-1914, 371–405. Oxford University PressNew York, NY, 1992. http://dx.doi.org/10.1093/oso/9780195062717.003.0018.

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Abstract The opening of the Yangtze River to foreign trade and the extension of the Treaty Port* system of open ports consequent to provisions of the 1858 Treaty of Tientsin created a network of foreign-initiated intraregional trade at a time when refugees from the Taiping rebels inflated the demand for real estate protected by the provisions for “foreign settlements” in the larger ports, especially Shanghai. The consequent boom was fueled in part by India-based banks with branches in Shanghai and the British Crown Colony of Hong Kong.
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González, Elías. "I Epistemología Hegemónica." In El dinamismo místico: Mística, resistencia epistémica y creación del mundo nuevo, 43–78. Aliosventos Ediciones AC, 2022. http://dx.doi.org/10.55821/col1.lib8.1.

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La revolución será epistémica o no será. La anterior no es una máxima exclusivista a la pura imagen de la extra ecclesiam nulla salus, sino una afirmación en apertura dialogal como el grito feminista “la revolución será feminista o no será”. No se trata de que todas y todos tengamos que militar en un colectivo feminista para aportar a la imaginación creativo-receptiva de otros horizontes. Por el contrario, se refiere a que si la revolución es posible ésta tendrá que permearse de la lucha feminista, lo mismo que de la indígena, la campesina, la de los estudiantes, y un largo etcétera. Este es el espíritu detrás de la metáfora zapatista de la “hidra capitalista”,la cual señala no sólo la realidad multicéfala del dinamismo opresor, sino también la exigencia multicéfala que han de encarnar nuestras luchas. A la par del grito común de ¡NO!, muchos SÍ es conglomeran los descontentos a la vez que se “reconocen y celebran la pluralidad de proyectos e ideales de cuantos participan en el movimiento, o sea, dan una forma política eficaz a la pluralidad real del mundo”. Buscamos, como han repetido en varias ocasiones lxs zapatistas, “un mundo donde quepan muchos mundos”.
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Gelernter, David. "The Orb." In Mirror Worlds. Oxford University Press, 1991. http://dx.doi.org/10.1093/oso/9780195068122.003.0009.

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To use a Mirror world program, you sit down at your computer, which has a large color screen and a connection to the local fiberoptic utility cable. (The screen and the cable are garden-variety technology today.) Or—if you’re willing to put up with a smaller picture and it’s a nice day—you pick up your laptop, tune in Data Radio and head for the hammock. In either case, you flip channels until you find the Mirror world of your choice, and then you see a picture. Capturing the structure and present status of an entire company, university, hospital, city or whatever in a single (obviously elliptical, high-level) sketch is a hard but solvable research problem. The picture changes subtly as you watch, mirroring changes in the world outside. But for most purposes, you don’t merely sit and stare. You zoom in and poke around, like an explorer in a miniature sub. At every level the display is live: it changes as you watch. You move a viewing-frame around the picture with a mouse or equivalent, probably equipped with knobs for zooming. You meet your software agents and other Mirror world visitors along the way. when your agents have developments to report, or when you choose to ask questions or plant new agents, you pop into a sub-screen that displays ordinary text. You can enter a Mirror world through any household computer, but a few extra controls come in handy. Your basic Mirror world computer is equipped with a perspective shifter, a diving mouse, a “history” key (with a time-travel velocity knob right next to it), the all-important “experience” key, and finally an “agent” key. There is the ordinary keyboard besides. (I’m describing hardware gadgets that are similar to what you can buy today at the corner computer store. If you plan to do lots of Mirror worlding, you’ll invest in the Mirror world Value Pack, or whatever; the extra gadgets are tacked onto the computer in the same way your mouse is attached. The “viewpoint shifter” probably looks like a joystick; the diving mouse is the same as any other mouse, but equipped with an altitude-control knob.

Conference papers on the topic "Extra large pore":

1

Xu, Ting, and Yi Wei. "Optimization of Gas Channel Controlling Technique During Co2 Immiscible Flooding in Normal Pressure Tight Oil Reservoir——A Case Study of Honghe Chang 8 Reservoir in South Ordos Basin." In International Petroleum Technology Conference. IPTC, 2021. http://dx.doi.org/10.2523/iptc-21334-ms.

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Abstract Tight oil reservoir is commonly recognized to be difficult to supply the formation energy. Tight oil reservoir in Ordos basin is characterized to be continental sedimentation, strong heterogeneity, normal pressure (0.9), low reserve abundance, imperative to supply the displacing energy. CO2 have good injection and high displacing efficiency for extra-low permeability reservoir, which provides the reference for exploring the effective development mode in tight reservoir. Influencing by complex fracture and hydraulic fracturing, as CO2 flooding is conducted in tight oil reservoir, gas channeling phenomenon is very serious, displacing energy is difficult to be utilized. To enlarge CO2 sweep efficiency, how we can effectively control CO2 channeling becomes the first important issue in energy supplying development of normal pressure tight reservoir. In the paper, a case of Honghe Chang 8 tight oil reservoir was carried out. Medium-large and medium-small scale fractures were artificial fabricated in natural crop cores according to G&G understanding. In different fracture openings models, two-stage blocking experiments with CO2 flooding were operated with high-strength starch gel and weak-strength ethylenediamine. Slug combination, volume and sequence were evaluated and by numerical simulation, blocking strength were defined to reflect the plugging effect in the experiment. Then build up well group numerical simulation model, characterizing the complex fracture network. Blocking sites and volume of plugging agents were analyzed and optimized. Two-stage blocking technique was determined in the fracture developed tight reservoir during CO2 flooding. Research results indicate it is priority to control the gas channeling of medium-large scale fractures with sufficient volume of the starch gel. As CO2 flooding is performed, gas starts to break through, followed by small volume ethylenediamine to mitigate gas channeling. Numerical simulation shows that firstly fully controlling gas channeling from medium-large scale fracture along with principal stress, then injecting plugging agent from the injection well, being located in 1/3~1/2 of well space to treat medium-small scale fractures with the best production stimulation. Starch gel volume is determined by medium-large scale fractures pore volume(PV), while low concentration starch gel and ethylenediamine volume is optimized to be half of the medium-small scale fracture PV, in which PV of fracture permeability lower than 200×10-3μm2 determine ethylenediamine volume. Generally, plugging agent would be more than 1500m3 for a pair of I-P wells. With low cost CO2 source, CO2 flooding is expected to be one of the important development modes for normal pressure tight oil reservoir. During CO2 immiscible flooding, gas channel controlling technique plays decisive roles in ensuring successful development. Research results are not only advisable for the Ordos normal pressure tight reservoir development, but also for the similar tight reservoir in the world.
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Cao, Wen, and Rami M. Younis. "Numerical Study of the Influences of Dynamic Loading and Unloading Rates on Fracturing." In 57th U.S. Rock Mechanics/Geomechanics Symposium. ARMA, 2023. http://dx.doi.org/10.56952/arma-2023-0936.

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ABSTRACT Dynamic loading offers the potential to induce densely connected fractured pore space over large bulk volumes of impermeable rock. An understanding of the impacts of the dynamic loading and unloading rates on the resulting fracturing can guide the design of discharge technologies. This work numerically investigates the dependence of the extent of fracturing on dynamic loading characteristics. We reconcile a high-fidelity model (finite-discrete element method with nonlinear fracture mechanics) with experimental observations. The model is subsequently used to simulate various loading scenarios spanning laboratory to field scale conditions. INTRODUCTION In contrast to hydraulic fracturing, high-energy dynamic loads generate radial fractures which are not influenced by formation stress anisotropy. This removes the need for determining the in-situ stress orientation, which is a necessary factor in designing horizontal wells that undergo multiple hydraulic fracturing treatments. This study aims to investigate the effect of different dynamic load functions on seismic fracturing. One way to create high-energy dynamic loads is to use explosives (e.g., Grady et al. (Grady et al., 1980), Banadaki et al. (Banadaki, 2010), Zhang et al. (Zhang et al., 2017), and Jeong et al. (Jeong et al., 2020)). Explosives generate loading pulses with a maximum peak pressure that can exceed 1 GPa and a rise time of the pressure waveform on the order of 1 to 2 microseconds. Experiences using explosives are well-documented and span applications in various materials like granite, shale, and PMMA. The body of reported experiments shows that the extent of crack propagation depends on the energy released by the explosive charge, although a quantitative understanding of this relationship remains elusive for formations in the deep subsurface which cannot be observed directly or with great resolution. Another type of technology delivers the dynamic load using shock waves created in liquid. Hamelin et al. (Haimson and Fairhurst, 1967), Maurel et al. (Maurel et al., 2010), Chen et al. (Chen et al., 2012), and Xiao et al. (Xiao et al., 2018) for instance, applied Pulsed Arc Electrohydraulic Discharges (PAED) to produce shock waves in water. These loading profiles typically involve a longer time for the load to reach its peak. Moreover, in the case of laboratory experiments, reflections of shock waves from the finite samples may create extra fractures. To study the potential of formation fracturing at the field scale, large sample sizes, a wide variety of high energy loadings, and accurate diagnostics are needed. Given the challenge and costs of such extensive experimentation, numerical simulation can offer a useful alternative to narrow down the range of pulses to be investiated.
3

Al-Khaldi, Meshal, Dhari Al-Saadi, Mohammad Al-Ajmi, Abhijit Dutta, Ibrahim Elafify, Nadir Farhi, and Walid Nouh. "Double Casing Exit for Side-Track to Commingle Two Borehole Sizes Based Sections in One Slim Shot to Well TD." In SPE Middle East Oil & Gas Show and Conference. SPE, 2021. http://dx.doi.org/10.2118/204881-ms.

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Abstract This project began when a 9-5/8" in 43.5 ppf production casing became inaccessible due to the existing cemented pipe inside, preventing further reservoir section exposure and necessitating a mechanical side-track meanwhile introducing the challenge of loosing one section and imposimg slim hole challenges. The size and weight of the double-casing made for challenging drilling, as did the eight very different formations, which were drilled. The side-track was accomplished in two steps, an 8½ in hole followed by a single long 6⅛ in section, rather than the three steps (16 in, 12¼ in, 8½ in) that are typically required. The optimal kick off point carfully located across the dual casing by running electromagnetic diagnostics, the casing collar locator, and the cement bond log. The double casing mill was carefully tailored to successfully accomplish the exit in one run. Moreover, an extra 26 ft. MD rathole was drilled, which helped to eliminate the mud motor elongation run. A rotary steerable system was utilized directly in a directional BHA to drill an 8½ in open hole building section from vertical to a 30⁰ inclination. A 7.0 in liner was then set to isolate weak zones at the equivalent depth of the outer casing (13-3/8"). Subsequently, a single 6⅛ in section was drilled to the well TD through the lower eight formations. Drilling a 6⅛ in section through eight formations came with a variety of challenges. These formations have different challenging behaviors relative to the wellbore pressure that typically leads to the drilling being done in two sections. Modeling the geo-mechanical characteristics of each formation allowed the determination of a mud weight range and rheology that would stabilize the wellbore through all eight formations. The slim, 6⅛ in, hole was stabilized with higher equivalent circulating density (ECD) values than is typically used in larger boreholes. Optimizing mud weight and drilling parameters, while managing differential sticking with close monitoring of real-time ECD, helped to stabilize the high-pressurized zones to deliver the well to the desired TD with a single borehole. This project represents the first time in Kuwait that double casings in such large sizes have been cut and sidetracked. It is also the first time these eight formations have been cut across such a smaller hole size, slim hole (6⅛ in) in a single shot. Geo-mechanical modeling allowed us to stabilize the pressurized formations and to control the ECD. The well also deployed the longest production liner in the field commingling multiple reservoirs with differnt pore pressure ramps, with excellent cement quality providing optimal zonal isolation.
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Li, Yuan, Bojun Li, Lianqi Sheng, Erdong Yao, Kun Zhang, Guolin Yu, and Fujian Zhou. "Comparative Study on Enhanced Oil Recovery Effect of Amphiphilic Nanomaterials - Experiment and Mechanism Investigation." In 56th U.S. Rock Mechanics/Geomechanics Symposium. ARMA, 2022. http://dx.doi.org/10.56952/arma-2022-2045.

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ABSTRACT: Due to the transcendental property of nanoparticle, nanoparticle fluid flooding becomes one of the enhanced oil recovery (EOR) technique, which had played a significant role in tight oil exploitation in the worldwide scale recent years. In particular, the amphiphilic nanomaterials can greatly increase the oil recovery. To provide some guidance in selecting nanomaterials for flooding, 3 kinds of amphiphilic nanomaterials, including silicon dioxide (SiO2), graphene oxide (GO) and molybdenum disulfide (MoS2), are chosen to serve as object of the study. In lab, the physical properties were systematically characterized and flooding was conducted. Further, the morphology character of nanomaterials was placed extra emphasis and the mechanisms of EOR were also studied. The purpose was to find the link between the morphology of nanomaterials and EOR. Flooding experiment revealed that MoS2 were able to enhance the oil recovery by approximately 11%, which were better that of the others. From the above, it can be inferred that spherical materials have a "point-to-surface" contact at multiphase interfaces, while sheet materials can achieve a "surface-to-surface" contact with a higher interfacial activity. In addition, the film-climbing characteristics of amphiphilic nanomaterials were found in the experiment, which may be one of the potential reasons for enhanced oil recovery. 1. INTRODUCTION Most of the world’s oil fields have experienced primary and secondary oil recovery, with severe declines in well production and increases in water content. Combined with unfavourable conditions such as low reservoir permeability, about 50% or more of the crude oil cannot be successfully recovered (Alija et al, 2018). Chemical drive is a commonly used method to enhance recovery and is widely used in China, but with the gradual expansion of unconventional reservoir development, the main application of chemical drive has shifted to low-permeability and ultra-low-porosity reservoirs. Due to the small pore size and large specific surface area of low-permeability and ultra-low-permeability reservoirs, they have unfavourable factors such as high start-up pressure gradients and insufficient formation energy, and the development of these reservoirs is mainly based on water injection, resulting in problems such as "no injection, no recovery" in low-permeability and ultra-low-permeability reservoirs (LI Weicai et al, 2011; DOU Hong en et al, 2014; LI Xiangfang en et al, 2020). This has become one of the current issues of concern in terms of EOR.
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Collins, Curtis L. "Stiffness Modeling and Force Distribution for the All-Terrain Hex-Limbed Extra-Terrestrial Explorer (ATHLETE)." In ASME 2007 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. ASMEDC, 2007. http://dx.doi.org/10.1115/detc2007-35404.

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The All-Terrain Hex-Limbed Extra-Terrestrial Explorer (ATHLETE) is a six limbed vehicle designed for both mobility and manipulation. Each limb has six active degrees-of-freedom, plus a powered wheel. Along the axis if each wheel is a mechanical interface that allows the integration of tools that can make use of the wheel actuator. Thus each limb can act as a leg for walking, an active suspension for a driven wheel, or a manipulator with an actuated tool. Fundamental to the operation of the system is the ability to control limb pose, overall body pose, as well as regulate limb forces. Joint torques are estimated from the difference between the incremental and absolute encoder readings on each joint. Forces are then computed from joint torques and force regulation is performed by modifying the limb positions. Force regulation allows the vehicle to lift larger payloads and traverse terrain while actively complying to terrain features.
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Liu, Yang, Xiaodong Song, Xiaoxian Yao, and Kun Li. "Dynamic Analysis for Cryogenic and High Pressure Fueling Valve of Combustion Light Gas Gun System." In ASME 2013 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/imece2013-62942.

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The paper describes the dynamic behaviors of a unique cryogenic and extra-high pressure pneumatic valve for the high pressure gaseous medium injection of combustion light gas gun (CLGG), which is known as a unique technique to achieve hypervelocity projectile. As a critical component of the CLGG’s injecting system, the operation principle and dynamic property of the valve are detailedly investigated by means of theoretical and experimental way. The problem of needing large driving power and slowing response in extra-high pressure pneumatic on-off valve is solved by means of lever pneumatic force balance method. A two-stage valve that used a two-position five-port pilot solenoid plunger valve to control a large flow-rate poppet valve is developed. The definitions and rules of a dynamic processes based on the critical pressure points in the control chamber are put forward. The mathematical models of the valve are obtained based on above definitions and rules. The paper show that the valve’s dynamic property obtained from the modeling and simulation is in accordance with the experiment results. The main work of this paper concentrates on investigating the operation principle, mathematical model and dynamic characteristics of the new cryogenic and high pressure fueling valve of CLGG system.
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Greve, Martin, Martin Kurowski, Sebastian Ritz, Matthias Golz, Lakshmi Narasiman Vijayasarathi, Nursen Bayazit, and Erik Rentzow. "Design of the Propulsion System for the Autonomous XLUUV MUM." In ASME 2022 41st International Conference on Ocean, Offshore and Arctic Engineering. American Society of Mechanical Engineers, 2022. http://dx.doi.org/10.1115/omae2022-78583.

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Abstract The paper reports on one aspect in the design of the extra-large unmanned underwater vehicle (XLUUV) MUM, referring to a large Modifiable Underwater Mothership. The vessel will be highly modular and has unique features, such as hydrogen fuel cell and lithium-ion batteries. Modules can be added and rearranged to fulfill different operations. The envisaged operation scenarios pose a challenge to the design of the propulsion and maneuvering system. Due to the limited power and energy storage, it must be efficient during submerged transit, capable of safe surfaced operation in public sea routes and of dynamic positioning. A design study is presented based on an initial design of two variants. The basic hull forms are compared in terms of required forces and moments for vessel motions. Simulations of hull forces are conducted using Reynolds-averaged Navier-Stokes (RANS) equations and vessel motions are determined with an actuator force model. Different arrangements of propulsors and thrusters are investigated and compared concerning their propulsion efficiency and their agility in translatory and rotary directions. The results are presented as tabulated data and in capability plots. A final design is presented and discussed and a conclusion is presented.
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Montes de Oca Rivas, Valeria Cristina, Andres Felipe Correa Palacio, Irene Caballero Sanz, and Adislen Guillama Henriquez. "Entre la Psicosis por Metanfetamina y la Esquizofrenia: a propósito de un caso clínico." In 22° Congreso de la Sociedad Española de Patología Dual (SEPD) 2020. SEPD, 2020. http://dx.doi.org/10.17579/sepd2020p088.

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Introducción La metanfetamina (Meth) es la segunda droga más consumida en el mundo, con un riesgo de 36,5% de probabilidad de producir síntomas psicóticos en un solo uso, y con la descripción en la literatura de la psicosis crónica por metanfetaminas (PCM). Método y objetivos Se presenta el caso de un varón de 35 años consumidor desde hace 11 años de meth en forma fumada, que desde el 2017 inicia sintomatología psicótica haciéndose diagnóstico diferencial entre psicosis crónica inducida por metanfetamina y esquizofrenia. A la exploración destaca una ideación delirante de persecución y perjuicio con temática política, asociaciones laxas e interpretaciones delirantes. Alucinaciones auditivas extra psíquicas (intra psíquicas en ocasiones) en tono de burla y amenazantes, y alucinaciones visuales puntuales durante su evolución. Pruebas complementarias: TAC y analítica sin alteraciones. Resultados y discusión El paciente ha presentado 5 ingresos, con paso por hospital de día con persistencia de ideación delirante, con repercusión afectiva y conductual, sin ceder por completo y con ausencia de crítica con dosis adecuadas de dos antipsicóticos. Los sistemas de clasificación como el DSM-V indican que un trastorno por uso de sustancias debe durar hasta un máximo de un mes e incluso si este dura más de 6 meses ya se considera una psicosis primaria, llegando incluso entre un 19,1% a 30% de pacientes diagnósticados de PCM a cambiar su diagnóstico a lo largo del seguimiento. En cuanto a las causas de esta relación existen autores que creen que la Meth actúa como otro factor en la vulnerabilidad para desarrollar esquizofrenia, mientras que otros consideran son entidades diferentes. Entre las diferencias que podemos encontrar entre ambas, destaca que la psicosis por Meth está caracterizada por alucinaciones visuales y táctiles, con menor probabilidad de síntomas de primer orden y negativos, pero con mayor frecuencia de recaídas y suicidio.
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Porres, María Joaquina, Ana Belén Anquela Julian, and Eloína Coll Aliaga. "¿Evaluación continua o pruebas finales? Motivar y evaluar en tiempos de pandemia." In INNODOCT 2021. Valencia: Editorial Universitat Politècnica de València, 2021. http://dx.doi.org/10.4995/inn2021.2021.13395.

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Unos de los principales problemas que afecta a la universidad española es el abandono de los estudios que se concentra, fundamentalmente, en el primer curso. Se debe a varias causas: falta de orientación a la hora de elegir estudios, desajustes en los planes de estudio, uso de metodologías docentes obsoletas y falta de motivación del alumnado entre otras. El abandono en el primer curso de los estudios universitarios se ha visto agravado por la situación de confinamiento, en la que el alumno, que aún se encontraba adaptándose a las plataformas, aplicaciones y docencia del sistema universitario, ha tenido que readaptarse a la docencia no presencial. Este alumno nobel, requiere seguimiento, feedback y mucha motivación que le haga no sucumbir ante tanto reajuste. Por otra parte, la situación de pandemia requiere sensibilidad hacia aquellos alumnos que, por diferentes circunstancias, no tienen la posibilidad de realizar un seguimiento continuo o uniforme de la asignatura. Entonces: ¿Evaluación continua o pruebas finales? Para adaptarse a esta situación, se ha diseñado un plan de evaluación para una asignatura de primer curso de grado de ingeniería con 99 alumnos matriculados. Un sistema que se fundamenta en un par de pruebas finales obligatorias para todo el alumnado y una serie de trabajos e intervenciones optativas planteadas de forma continua a lo largo del cuatrimestre, que permiten controlar el seguimiento de la asignatura casi en tiempo real, motivando al alumnado que se ve recompensado con algunos puntos extra. Además, este trabajo opcional permite que el alumnado detecte y corrija a tiempo los fallos cometidos. Este sistema de evaluación tradicional, apoyado por el trabajo opcional continuo, ofrece las mismas oportunidades a todos los alumnos, a aquellos que requieren más atención para no sucumbir y a los que, por la pandemia, tienen problemas con el seguimiento de los estudios.
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Guido, Elida Simone, Jéssica Teixeira Da Silveira, Felipe Da Silva Figueira, and Susana Juliano Kalil. "EXTRAÇÃO DE XILANAS DE BIOMASSAS LIGNOCELULÓSICAS PARA PRODUÇÃO ENZIMÁTICA DE XILO-OLIGOSSACARÍDEOS." In I Congresso de Engenharia de Biotecnologia. Revista Multidisciplinar de Educação e Meio Ambiente, 2021. http://dx.doi.org/10.51189/rema/1325.

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Introdução - Xilo-oligossacarídeos (XOs) são oligossacarídeos não digeríveis e fermentáveis que apresentam propriedades prebióticas, além de outros efeitos benéficos à saúde, podendo ser utilizados em alimentos funcionais ou preparações simbióticas. Na indústria biotecnológica, os XOs são obtidos preferencialmente por hidrólise enzimática de xilanas extraídas de biomassas lignocelulósicas, amplamente disponíveis e de baixo custo, tais como os subprodutos e resíduos agroindustriais, o que reduz os custos do processo e possibilita um melhor aproveitamento de biomassas subexploradas. A biomassa lignocelulósica é constituída basicamente por celulose, hemicelulose e lignina, sendo que a xilana se encontra na forma de um complexo xilana-lignina resistente ao ataque de enzimas, tornando necessário extraí-la previamente à hidrólise. Objetivo - Produzir XOs potencialmente prebióticos por hidrólise enzimática das xilanas de casca (CA) e farelo (FA) de arroz, casca de soja (CS) e engaço de uva (EN). Material e métodos - As xilanas de CA, FA, CS e EN foram extraídas por dois métodos alcalinos diferentes M1 e M2 (acoplado ao tratamento térmico e à precipitação etanólica), a fim de verificar a estratégia mais eficiente na extração e recuperação de xilanas. Posteriormente, as xilanas (6,0%, m/v) foram hidrolisadas com endo-xilanases (133 U/g) em reatores de mistura a 180 rpm e 60°C por 24 horas, visando à produção de XOs de baixo grau de polimerização (GP) que apresentam potencial prebiótico comprovado. Resultados - Ambos os métodos de extração alcalina (M1 e M2) foram eficientes na recuperação das xilanas de biomassas lignocelulósicas, sendo que os maiores rendimentos foram alcançados com o M1 e M2 para a CA (43% e 28%) e M2 para o EN (20%). A hidrólise enzimática da xilana de CA resultou na maior concentração de XOs de baixo GP (5,67 mg/mL), sobretudo xilobiose e xilotriose, seguido pelas xilanas de EN (2,91 mg/mL) e CS (0,94 mg/mL). Conclusão - Os resultados obtidos corroboram a possibilidade de produzir XOs prebióticos por hidrólise enzimática das xilanas de subprodutos e resíduos agroindustriais, e contribuem para o desenvolvimento da produção tecnológica e economicamente viável de XOs em larga escala.

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