Chemical sand stabilization has potential for desertification control and this method is characterized by its speed and convenience in operation compared with other stabilization technologies.
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complete sand control and limited sand production. This book presents a comprehensive introduction of technologies applied in the development of poorly consolidated sandstone reservoirs. The contents include studies of sand production mechanisms, sand production prediction and productivity index appraisal, selection of well completion approaches,
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The tooth provides an excellent system for deciphering the molecular mechanisms of organogenesis, and has thus been of longstanding interest to developmental and stem cell biologists studying embryonic morphogenesis and adult tissue renewal. ... Molecular and cellular mechanisms of tooth development, homeostasis and repair Development. 2020 Jan ...
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In this work, we present a novel semi-analytical framework for modelling sand production in cylindrical geometries under axisymmetric conditions and isotropic stress field.
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Based on the time frame of sand production record, four major possible chemical reactions between reservoir sand and formation water are identified and analyzed, including …
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Mechanisms for sand failure include: tensile, shear, cohesive, and pore collapse. Additionally, failure due to chemical effects can occur when the cementation materials are …
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Efficient and long-term sand production prevention and control is an important technical guarantee for the safe operation of gas storage.
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The soil in actual site is anisotropic consolidated with an initial consolidation ratio k c =σ 10 /σ 30 and a deviator stress (σ 10 −σ 30), where σ 10 and σ 30 denote the initial vertical effective stress and the initial confining pressure, respectively. The effect of consolidation ratio on the liquefaction resistance of sand has been studied using laboratory tests over the decades.
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Mechanisms of NAFLD development and therapeutic strategies Nat Med. 2018 Jul;24(7):908-922. doi: 10.1038/s41591-018-0104-9. Epub 2018 Jul 2. Authors Scott L Friedman 1, Brent A Neuschwander-Tetri 2, Mary Rinella 3, Arun J al 4 Affiliations 1 …
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A state-dependent multi-mechanism model for sands in three-dimensional space is proposed within the framework of critical-state soil mechanics. The mechanical deformation behaviour of sands is characterised with a macroscopic volumetric mechanism and a number of one-dimensional equivalent microscopic shear mechanisms (EMSMs) in various orientations. …
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Roles of ROS in Plant Growth and Development. The appearance of aerobic conditions gave organisms the opportunity to use oxygen as an electron acceptor, while enabling them to harness its reactive properties for metabolism and signaling (Schippers et al., 2012; Foyer and Noctor, 2016).It was therefore, inevitable that evolution in an oxygenic environment would …
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This paper studies the mechanism of sand aging using DEM simulations of a granular assembly subjected to triaxial shear, creep, and post-creep shear. The DEM model with irregularly shaped incompressible particles is constructed and calibrated to mimic a natural sand.
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Photodynamic therapy - mechanisms, photosensitizers and combinations Biomed Pharmacother. 2018 Oct:106:1098-1107. doi: 10.1016/j.biopha.2018.07.049. ... Over the last decade, a significant acceleration in the development of nanotechnology has been observed. The combination of photosensitizers with nanomaterials can improve the photodynamic ...
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Empirical correlations, numerical simulations, and analytical models are among the sand production prediction techniques critically assessed in this study. The benefits, …
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Recrystallization nucleation mechanisms were subject of contention for several years. It is now appreciated that the recrystallization nucleation mechanism differs from that characteristic of conventional phase transformations where classical nucleation theories are applicable [13].The nuclei which give rise to new recrystallized grains are believed to be …
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Our East Quarter development within Golden Sands truly accentuates this residential vision, combining freestanding medium density homes, duplexes, terraced houses and smaller apartment complexes all centred around a large community reserve and adjacent to The Sands. Stages 1 and 2 are complete and homes in Stages 3 - 6 are currently underway ...
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a, A schema for diagnosing NAFLD and NASH.Credit: Marina Corral Spence/Springer Nature. b, The panel of images from liver biopsies demonstrate the typical appearances of macrovesicular steatosis (fat), hepatocellular ballooning, lobular inflammation and pericellular fibrosis (arrows).As the disease progresses into cirrhosis (not shown), these features may also regress.
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The international 4 per 1000 initiative aims at supporting states and non-governmental stakeholders in their efforts towards a better management of soil carbon (C) stocks. These stocks depend on soil C inputs and outputs. They are the result of fine spatial scale interconnected mechanisms, which stabilise/destabilise organic matter-borne C. Since 2016, the CarboSMS …
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Persisters refer to genetically drug susceptible quiescent (non-growing or slow growing) bacteria that survive in stress environments such as antibiotic exposure, acidic and starvation conditions.
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Research on sand control effect and micro-plugging mechanism of sand control medium in the development of natural gas hydrate reservoir. Author links open overlay panel Jiping Ding a b ... The research results are conducive to understanding mechanisms of sand control elements plugged by gravel during the exploitation of hydrate reservoirs and ...
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The use of antibiotics over 100 years has triggered the widespread and rapid transfer of antibiotic resistance genes (ARGs) among bacteria across the world (Andersson, 2003; Larsson and Flach, 2021).Clinical resistance of the spirochaete bacterium Treponema pallidum to the antibiotic arsphenamine (also known as Salvarsan) was first reported in 1924 (Silberstein, …
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Sand aging, defined by time-dependent increases in stiffness and strength over periods ranging from days to months, poses significant challenges in geotechnical engineering …
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Private Property has 212 houses, apartments, complexes, farms, land for sale in Vanderbijlpark CE. View photos, virtual tours and detailed property descriptions.
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Scarcity of water is a severe environmental constraint to plant productivity. Drought-induced loss in crop yield probably exceeds losses from all other causes, since both the severity and duration of the stress are critical. Here, we have …
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Gene regulatory networks and tissue morphogenetic events drive the emergence of shape and function: the pillars of embryo development. Although model systems offer a window into the molecular biology of cell fate and tissue shape, mechanistic studies of our own development have so far been technical …
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A new discrete element method and computational fluid dynamics coupling model is developed by combining the resolved and unresolved method. To overcome the inaccuracy of fluid-particle drag force calculation and limitation on the size ratio of fine particles to fluid meshes, two aspects of improvements are made for sand production simulation over the existing …
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This paper studies sand management (SMan) and its conceptual development from a geomechanical approach. This effort highlights how risk paradigms within the oil and gas industry closely influence the practice and conceptualization of SMan (Ben Mahmud, Leong and Lestariono, 2020; Mahmoudi et al., 2018).In this paper, "concept" implies a principle of action …
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The human population is increasing at an alarming rate, whereas at the same time agricultural productivity is decreasing due to the effect of various environmental problems. In particular, cold stress is a serious threat to the sustainability of crop yields. Indeed, cold stress can lead to major crop losses. Various phenotypic symptoms in response to cold stress include poor germination ...
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This study aims to investigate the effect of rock types, i.e., granite, conglomerate rock, limestone, and crushing mechanism, i.e., Vertical Shaft Impact (VSI) crusher, Horizontal Shaft Impact ...
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The basic mechanisms of earthquake-induced soil liquefaction are introduced by considering the shaking of a block on a thin granular layer, which mechanical behaviour is modelled with a ...
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Abiotic stress is the adverse effect of any abiotic factor on a plant in a given environment, impacting plants' growth and development. These stress factors, such as drought, salinity, and extreme temperatures, are often interrelated or in conjunction with each other. Plants have evolved mechanisms to sense these environmental challenges and make adjustments to …
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Representative range of ASRs observed in the texture-optimization process: (a) loose Ottawa sand seeded with dyed black sand; (b) dense Ottawa sand seeded with blue dyed sand. Standard deviation of subset pixel intensities, σ Is, and the sum of squares of subset pixel intensity gradients (SSSIG) for example subsets (48 × 48 pixels) of chosen ...
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Substrates are used to construct the body of CWs, which play a central role in treatment process (Mlih et al., 2020).The effects of substrates (physical filtration and interception, adsorption and ion exchanges), plants and microorganisms on pollution treatment are simultaneously present in CWs (Drayer and Richter, 2016; Fu et al., 2018).The categories and …
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Notably, the physico–chemical properties of oil sands depend to a large extent on their origin and geological environment in which they were deposited. Therefore, Indonesian oil sands differ from Canadian oil sands as no water film exists between bitumen and minerals of Indonesian oil sands and they belong to oil-wet type oil sands [6, 7 ...
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Nonalcoholic fatty liver disease (NAFLD) is emerging as the leading chronic liver disease worldwide (Loomba and al, 2013; Younossi et al., 2016).NAFLD is viewed as the hepatic manifestation of metabolic syndrome and is commonly associated with metabolic risk factors, including obesity, dyslipidemia, hypertension, and diabetes (Chalasani et al., 2018; …
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Initially, the aging of sand was speculated to be caused by the precipitation of carbonate or silica gel that leads to cementation at particle contacts (Mitchell and Solymar, 1984).Baxter and Mitchell (2004) examined this mechanism for two sands aged under 100 kPa vertical pressure in rigid wall cells at different relative densities and temperatures.
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Background Chronic and/or extreme stress in early life, often referred to as early adversity, childhood trauma, or early life stress, has been associated with a wide range of adverse effects on development. However, while early life stress has been linked to negative effects on a number of neural systems, the specific mechanisms through which early life stress influences …
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The slurry pressure-balance shield tunneling method is commonly used to excavate water-bearing strata, particularly saturated sand layers, owing to its high safety and effective pressure control (Bezuijen et al., 2006, Liang et al., 2020, Liu et al., 2020).Slurry primarily consisting of bentonite (a nonmetallic, montmorillonite-rich mineral) is selected because of its …
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Development by self-digestion: molecular mechanisms and biological functions of autophagy Dev Cell. 2004 Apr;6(4):463-77. doi: 10.1016/s1534-5807(04)00099-1. ... cellular and tissue remodeling, and cell death. However, until recently, the functions of autophagy in normal development were largely unknown. The identification of a set of ...
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Aging is a complex and multifaceted process involving a variety of interrelated molecular mechanisms and cellular systems. Phenotypically, the biological aging process is accompanied by a gradual loss of cellular function and the systemic deterioration of multiple tissues, resulting in susceptibility to aging-related diseases. Emerging evidence suggests that …
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