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Articles de revues sur le sujet "COLLARED FLOATER"
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Bearden, Romare. « Transparent Collages ». Journal of Bahá’í Studies 30, no 3 (19 mai 2021) : 51. http://dx.doi.org/10.31581/jbs-30.3.316(2020).
Texte intégralRésumé :
Figures and objects float in the luminous depths of Bunch Washington’s Transparent Collages, creations that are fascinating assemblages of textures and colors changing and expanding as the light caresses them at varying angles and at varying degrees of intensity.....
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Tan, Ying Jie, et Chang Ming Zhang. « The Design of Screw-Drive Mechanism for Testing Device ». Applied Mechanics and Materials 271-272 (décembre 2012) : 1206–10. http://dx.doi.org/10.4028/www.scientific.net/amm.271-272.1206.
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The main structure of bearing frame for pressure test device and it’s functions are described in this paper. For the pressure test device with float collar and float shoe, the screw transmits movement with standing pressuring load. According to the needs of actual production and the requirements of test sample pressuring, this paper designed a drive mechanism for screw rod, calculated the stress and checked the correlated stiffness. The result shows that it is reasonable, safe and reliable for screw-drive mechanism, depending on the operation behavior of float collar and float shoe pressure test device.
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Hanamure, Yutaka, Kouji Deguchi et Masaru Ohyama. « Ciliogenesis and Mucus Synthesis in Cultured Human Respiratory Epithelial Cells ». Annals of Otology, Rhinology & ; Laryngology 103, no 11 (novembre 1994) : 889–95. http://dx.doi.org/10.1177/000348949410301111.
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The mechanisms for the regulation of ciliogenesis and for the synthesis of mucus are not well understood. We sought to develop a culture system for differentiating ciliated and secretory types of human respiratory epithelial (HRE) cells. Dissociated HRE cells obtained from nasal polyps and maxillary sinus mucosa were cultured on type I collagen gel. Cells grown to confluence on collagen gel lost their cilia and exhibited a flat, squamouslike appearance. After reaching confluence, the cultured cells with a collagen gel substrate were removed from plastic dishes and floated in the culture medium. After 7 days in the floating culture, some cells exhibited several centrioles or basal bodies, while others showed secretory granules. The secretory phenotype predominated after 7 days. After 14 days in the floating culture, nearly all cells were ciliated. The results demonstrate that the differentiation of HRE cells can be induced by floating cultured cells with a collagen gel substrate in a defined culture medium.
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Barras, Alexandre, Félix Sauvage, Inès de Hoon, Kevin Braeckmans, Dawei Hua, Gaëtan Buvat, Juan C. Fraire et al. « Carbon quantum dots as a dual platform for the inhibition and light-based destruction of collagen fibers : implications for the treatment of eye floaters ». Nanoscale Horizons 6, no 6 (2021) : 449–61. http://dx.doi.org/10.1039/d1nh00157d.
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Parry, G., B. Cullen, C. S. Kaetzel, R. Kramer et L. Moss. « Regulation of differentiation and polarized secretion in mammary epithelial cells maintained in culture : extracellular matrix and membrane polarity influences. » Journal of Cell Biology 105, no 5 (1 novembre 1987) : 2043–51. http://dx.doi.org/10.1083/jcb.105.5.2043.
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Several previous studies have demonstrated that mammary epithelial cells from pregnant mice retain their differentiated characteristics and their secretory potential in culture only when maintained on stromal collagen gels floated in the culture medium. The cellular basis for these culture requirements was investigated by the monitoring of milk protein synthesis and polarized secretion from the mouse mammary epithelial cell line, COMMA-1-D. Experiments were directed towards gaining an understanding of the possible roles of cell-extracellular matrix interactions and the requirements for meeting polarity needs of the epithelium. When cells are cultured on floating collagen gels they assemble a basal lamina-like structure composed of laminin, collagen (IV), and heparan sulfate proteoglycan at the interface of the cells with the stromal collagen. To assess the role of these components, an exogenous basement membrane containing these molecules was generated using the mouse endodermal cell line, PFHR-9. This matrix was isolated as a thin sheet attached to the culture dish, and mammary cells were then plated onto it. It was found that cultures on attached PFHR-9 matrices expressed slightly higher levels of beta-casein than did cells on plastic tissue culture dishes, and also accumulated a large number of fat droplets. However, the level of beta-casein was approximately fourfold lower than that in cultures on floating collagen gels. Moreover, the beta-casein made in cells on attached matrices was not secreted but was instead rapidly degraded intracellularly. If, however, the PFHR-9 matrices with attached cells were floated in the culture medium, beta-casein expression became equivalent to that in cells cultured on floating stromal collagen gels, and the casein was also secreted into the medium. The possibility that floatation of the cultures was necessary to allow access to the basolateral surface of cells was tested by culturing cells on nitrocellulose filters in Millicell (Millipore Corp., Bedford, MA) chambers. These chambers permit the monolayers to interact with the medium and its complement of hormones and growth factors through the basal cell surface. Significantly, under these conditions alpha 1-, alpha 2-, and beta-casein synthesis was equivalent to that in cells on floating gels and matrices, and, additionally, the caseins were actively secreted. Similar results were obtained independently of whether or not the filters were coated with matrices.(ABSTRACT TRUNCATED AT 400 WORDS)
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Li, Chun Liu, et Yun Peng Zhao. « Motion Characteristics of Composite-Type Sea Cage under Pure Wave ». Advanced Materials Research 490-495 (mars 2012) : 3405–9. http://dx.doi.org/10.4028/www.scientific.net/amr.490-495.3405.
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To study motion range changes with wave condition and motion relationship between cages, physical model experiments were carried out. The authors designed 2 models of composite-type sea cages. Experimental data obtained by the CCD data acquisition system. The experiment results showed that 1.in the same period, horizontal motion range,vertical motion range and inclination changes of float collar increase with wave height; 2.In the same wave height, horizontal motion range of the float collar increases with period; 3.The laws between vertical motion and period are not obvious 4.The laws between inclination changes and period are not obvious 5.Motion range of the first cage along the direction of waves is less than other cages.
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Liu, Xiangde, Takeshi Umino, Marty Cano, Ronald Ertl, Tom Veys, John Spurzem, Debra Romberger et Stephen I. Rennard. « Human bronchial epithelial cells can contract type I collagen gels ». American Journal of Physiology-Lung Cellular and Molecular Physiology 274, no 1 (1 janvier 1998) : L58—L65. http://dx.doi.org/10.1152/ajplung.1998.274.1.l58.
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Fibroblasts can contract collagen gels, a process thought to be related to tissue remodeling. Because epithelial cells are also involved in repair responses, we postulated that human bronchial epithelial cells (HBECs) could cause contraction of collagen gels. To evaluate this, HBECs were plated on the top of native type I collagen gels and were incubated for 48 h. After this, the gels were released and floated in LHC-9-RPMI 1640 for varying times, and gel size was measured with an image analyzer. HBECs caused a marked contraction of the gels within 24 h; the area was reduced by 88 ± 4% ( P < 0.01). The degree of gel contraction was dependent on cell density; 12,500 cells/cm2 resulted in maximal contraction, and half-maximal contraction occurred at 7,500 cells/cm2. Contraction varied inversely with the collagen concentration (91 ± 1% with 0.5 mg/ml collagen vs. 43 ± 5% with 1.5 mg/ml collagen). In contrast to fibroblasts that contract gels most efficiently when cast into the gel, HBEC-mediated contraction was significantly ( P < 0.01) more efficient when cells were on top of the gels rather than when cast into the gels. Anti-β1-integrin antibody blocked HBEC-mediated contraction by >50%, whereas anti-α2-, anti-α3-, anti-αv-, anti-αvβ5-, anti-β2-, or anti-β4-integrin antibody was without effect. The combination of anti-β1-integrin antibody and an anti-α-subfamily antibody completely blocked gel contraction induced by HBECs. In contrast, anti-cellular fibronectin antibody did not block HBEC-induced gel contraction, whereas it did block fibroblast-mediated gel contraction. In summary, human airway epithelial cells can contract type I collagen gels, a process that appears to require integrins but may not require fibronectin. This process may contribute to airway remodeling.
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Streuli, C. H., et M. J. Bissell. « Expression of extracellular matrix components is regulated by substratum. » Journal of Cell Biology 110, no 4 (1 avril 1990) : 1405–15. http://dx.doi.org/10.1083/jcb.110.4.1405.
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Reconstituted basement membranes and extracellular matrices have been demonstrated to affect, positively and dramatically, the production of milk proteins in cultured mammary epithelial cells. Here we show that both the expression and the deposition of extracellular matrix components themselves are regulated by substratum. The steady-state levels of the laminin, type IV collagen, and fibronectin mRNAs in mammary epithelial cells cultured on plastic dishes and on type I collagen gels have been examined, as has the ability of these cells to synthesize, secrete, and deposit laminin and other, extracellular matrix proteins. We demonstrate de novo synthesis of a basement membrane by cells cultured on type I collagen gels which have been floated into the medium. Expression of the mRNA and proteins of basement membranes, however, are quite low in these cultures. In contrast, the levels of laminin, type IV collagen, and fibronectin mRNAs are highest in cells cultured on plastic surfaces, where no basement membrane is deposited. It is suggested that the interaction between epithelial cells and both basement membrane and stromally derived matrices exerts a negative influence on the expression of mRNA for extracellular matrix components. In addition, we show that the capacity for lactational differentiation correlates with conditions that favor the deposition of a continuous basement membrane, and argue that the interaction between specialized epithelial cells and stroma enables them to create their own microenvironment for accurate signal transduction and phenotypic function.
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Zhu, Y. K., X. D. Liu, C. M. Sköld, T. Umino, H. J. Wang, J. R. Spurzem, T. Kohyama, R. F. Ertl et S. I. Rennard. « Synergistic neutrophil elastase-cytokine interaction degrades collagen in three-dimensional culture ». American Journal of Physiology-Lung Cellular and Molecular Physiology 281, no 4 (1 octobre 2001) : L868—L878. http://dx.doi.org/10.1152/ajplung.2001.281.4.l868.
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Proteolytic degradation of extracellular matrix is thought to play an important role in many lung disorders. In the current study, human lung fibroblasts were cast into type I collagen gels and floated in medium containing elastase, cytomix (combination of tumor necrosis factor-α, interleukin-1β, and interferon-γ), or both. After 5 days, gel collagen content was determined by measuring hydroxyproline. Elastase alone did not result in collagen degradation, but in the presence of fibroblasts, elastase reduced hydroxyproline content to 75.2% ( P < 0.01), whereas cytomix alone resulted in reduction of hydroxyproline content to 93% ( P < 0.05). The combination of elastase and cytomix reduced hydroxyproline content to 5.2% ( P < 0.01). α1-Proteinase inhibitor blocked this synergy. Gelatin zymography and Western blot revealed that matrix metalloproteinase (MMP)-1, -3, and -9 were induced by cytomix and activated in the presence of elastase. Tissue inhibitor of metalloproteinase (TIMP)-1 and -2 were also induced by cytomix but were cleaved by elastase. We conclude that a synergistic interaction between cytomix and elastase, mediated through cytokine induction of MMP production and elastase-induced activation of latent MMPs and degradation of TIMPs, can result in a dramatic augmentation of collagen degradation. These findings support the notion that interaction among inflammatory mediators secreted by mononuclear cells and neutrophils can induce tissue cells to degrade extracellular matrix. Such a mechanism may contribute to the protease-anti-protease imbalance in emphysema.
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Liu, X. D., C. M. Skold, T. Umino, J. R. Spurzem, D. J. Romberger et S. I. Rennard. « Sodium nitroprusside augments human lung fibroblast collagen gel contraction independently of NO-cGMP pathway ». American Journal of Physiology-Lung Cellular and Molecular Physiology 278, no 5 (1 mai 2000) : L1032—L1038. http://dx.doi.org/10.1152/ajplung.2000.278.5.l1032.
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Nitric oxide (NO) relaxes vascular smooth muscle in part through an accumulation of cGMP in the target cells. We hypothesized that a similar effect may also exist on collagen gel contraction mediated by human fetal lung (HFL1) fibroblasts, a model of wound contraction. To evaluate this, HFL1 cells were cultured in three-dimensional type I collagen gels and floated in serum-free DMEM with and without various NO donors. Gel size was measured with an image analyzer. Sodium nitroprusside (SNP, 100 μM) significantly augmented collagen gel contraction by HFL1 cells (78.5 ± 0.8 vs. 58.3 ± 2.1, P < 0.01), whereas S-nitroso- N-acetylpenicillamine, 5-amino-3-(4-morpholinyl)-1,2,3-oxadiazolium chloride, NONOate, and N G-monomethyl-l-arginine did not affect the contraction. Sodium ferricyanide, sodium nitrate, or sodium nitrite was not active. The augmentory effect of SNP could not be blocked by 1 H-[1,2,4]-oxadiazolo-[4,3- a]-quinoxalin-1-one, whereas it was partially reversed by 8-(4-chlorophenylthio) (CPT)-cGMP. To further explore the mechanisms by which SNP acted, fibronectin and PGE2 production were measured by immunoassay after 2 days of gel contraction. SNP inhibited PGE2 production and increased fibronectin production by HFL1 cells in a concentration-dependent manner. CPT-cGMP had opposite effects on fibronectin and PGE2 production. Addition of exogenous PGE2 blocked SNP-augmented contraction and fibronectin production by HFL1 cells. Therefore, SNP was able to augment human lung fibroblast-mediated collagen gel contraction, an effect that appears to be independent of NO production and not mediated through cGMP. Decreased PGE2 production and augmented fibronectin production may have a role in this effect. These data suggest that human lung fibroblasts in three-dimensional type I collagen gels respond distinctly to SNP by mechanisms unrelated to the NO-cGMP pathway.
Thèses sur le sujet "COLLARED FLOATER"
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MASTALLI, ERICA. « Pricing of stochastic interest bonds using affine term structure. Models : a comparative analysis ». Doctoral thesis, Università degli Studi di Milano-Bicocca, 2010. http://hdl.handle.net/10281/13830.
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The aim of this work is to use one-factor stochastic term structure models to evaluate stochastic interest bonds, that are bonds bundled together some interest rate derivative, and to compare them with the theoretical value that the issuer indicates in the prospectus for the public offering.
Stochastic interest bonds are a sub-set of the big family of structured bonds, the latter being bonds that present specific algorithms driving coupons computation and payment at maturity, mainly due to the presence of one or more derivative components embedded in their financial structure.
Structured bonds are mainly issued by banks. Over the last two decades the offering of structured bonds to retail investors has consistently increased, with a contextual rise in the variety of the payoff structures.
Chapter 1, after a brief exposure of the evolution of term structure models and their classification, is devoted to analyze several one-factor affine term structure models: the Vasicek model, the Ho-Lee model and the Hull-White model.
Chapter 2 shows how to use the above models to price some typical interest rate derivatives (namely caps and floors) that are often embedded in the structure of stochastic interest bonds like those that will be considered in Chapter 5, which in fact, will include either a cap or a floor or both these two types of interest rate derivatives.
Chapter 3 is devoted to analyze some key concepts about credit risk in order to take into account the impact of this risk factor on the bond value. To this aim, we will illustrate some key results regarding credit derivatives, and, specifically, credit default swaps whose market quotes allow to infer reliable estimates of the cumulative and intertemporal default probabilities of an issuer at various maturities by using the so-called bootstrapping technique. Once these default probabilities are estimated they can be used to derive a general pricing formula for defaultable bonds which will be used to perform the fair evaluation of the ten stochastic interest bonds analyzed in Chapter 5.
Chapter 4 is devoted to study in detail the financial engineering of a specific kind of stochastic interest bonds, namely the so-called collared floaters, which are floating-rate coupon bonds whose coupons are subject to both an upper and a lower bound, hence embedding two interest rate derivatives, either a long cap and a short cap or a long floor and a short cap depending on the specific unbundling choice we make.
In particular, the unbundling of a generic collared floater into its various elementary components is examined, as it will be useful to the pricing of many bonds included in the set of securities analyzed in Chapter 5.
Chapter 5 is focused on the pricing of ten stochastic interest bonds recently issued by four of the major Italian banks: six of them are pure collared floaters, two of them are mixed fixed-floating coupon bonds, whose floating coupons have the typical structure of collared floaters, one bond is a floating-rate coupon bond embedding a floor, and one bond is a floating-rate coupon bond embedding a floor for the first half of its life and a cap for the second half of its life.
After the illustration of their unbundling, these bonds are priced by means of two alternative pricing methodologies.
The first methodology is based on the unbundling of their financial structure which reveals how these bonds can be seen as the composition of one or more pure bond components and of one or more interest rate derivatives, namely caps and/or floors, whose closed formulas - in the framework of the one-factor affine term structure models of Chapter 1 developed under the risk neutral probability measure - have been presented in Chapter 2.
The second methodology relies instead on Monte Carlo simulations, performed again under the risk neutral probability measure; in this case the fair value of a bond is determined by discounting back at the evaluation date the final value of the security over each simulated trajectory and, then, by averaging these discounted values.
The two pricing methodologies are implemented both in the framework of the Vasicek model and in that of the Hull and White model.
Their results turn out to be consistent and, compared with the theoretical value indicated in the final terms of the prospectus published by the issuers, are a useful instrument to explore the reliability and the accuracy of the informative set included in this document that investors use to take their financial decisions.
Actes de conférences sur le sujet "COLLARED FLOATER"
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Bai, Xiao-Dong, Yun-Peng Zhao, Guo-Hai Dong et Chun-Wei Bi. « Investigation on the Probabilistic Distribution of the Stress Range of Net Cage Floater of Fish Cage for Fatigue Life Prediction ». Dans ASME 2018 37th International Conference on Ocean, Offshore and Arctic Engineering. American Society of Mechanical Engineers, 2018. http://dx.doi.org/10.1115/omae2018-78760.
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The failure risk of fish cages has increased in the harsher environmental conditions as fish farms have moved into the open sea in recent years. Fatigue failure is an important limit state for the floating system of the fish cage under the long-term action of waves. This study is presented to investigate the applicable probability density function for estimating fatigue life of the high-density polyethylene (HDPE) floating collars. The stress response of the floating collars system in random wave is firstly analyzed based on the finite element analysis combined with a hydrodynamic model. The stress histories of floating collars under each sea state are counted using the rainflow method as a benchmark for fatigue frequency domain analysis. The distribution of stress range was fitted by various probability density functions including Rayleigh, Weibull, Gamma and generalized extreme value (GEV) distributions. Comparisons of the estimated fatigue life using different distributions with rainflow statistic results were performed. Results indicate fatigue estimation based on the GEV and Gamma distributions by removing the negligible low stress range give much more accurate fatigue damage results of the short-term stress range distribution. While Weibull distribution overestimates the fatigue lifetime of the floating collar based on the short-term distribution of stress ranges.
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Chou, Frank, John Chianis et Xinyu Zhang. « Self-Installed Single Column Floater ». Dans ASME 2004 23rd International Conference on Offshore Mechanics and Arctic Engineering. ASMEDC, 2004. http://dx.doi.org/10.1115/omae2004-51466.
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This paper introduces a novel floating production platform concept for exploration and production of oil and gas in ultra deep water. The developmental effort has been supported by ABB in-house research and development budget. This novel production unit is an enhanced version of ABB Self-Installed Single Column Floater (SISCF) concept. This unit is envisioned to be completely assembled at quayside, towed to location, and be installed vertically to its target draft without the need of a major crane vessel. This enhanced feature reduces the wind load on the deck and hull significantly during wet tow as well as alleviates the uncertainty on the duration of an offshore operation, thereby widens the weather window for installation, hook-up and commissioning offshore. The enhanced SISCF (ESISCF) hull consists of four major components i.e., hard tank with center opening, soft tank with telescoping truss members and opening, permanent-stability ring, and three (3) telescoping support columns. During the installation phase, the telescoping columns are used to guide the permanent-stability ring, which provided needed stability in the installation phase. In addition, because of the way center truss being constructed, the hard tank is collapsed (or sit) right on top of the soft tank during wet tow thus reduced the wind arm (almost 100 ft) and wind forces. In its in-place position, ESISCF motion responses in waves are found to be excellent because of its deep draft. The current concept combines the advantages of a spar and a semi-submersible vessel. The paper will detail the concept, and outline the fabrication to installation scenario. The principal dimensions of a typical ESISCF for a given payload will be presented together with its stability and motion responses in waves based on the sea conditions representing a typical geographical area of Gulf of Mexico. The advantages of this concept will be explained in detail.
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Bardestani, Mohsen, et Odd M. Faltinsen. « A Two-Dimensional Approximation of a Floating Fish Farm in Waves and Current With the Effect of Snap Loads ». Dans ASME 2013 32nd International Conference on Ocean, Offshore and Arctic Engineering. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/omae2013-10487.
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Wave and current loads on the floater, netting and sinker tube of a floating fish farm are discussed. High flexibility of netting, floating collar and sinker tube and their structural interaction are important effects. Regular wave and uniform current load induced response of a section of a floater with net structure and sinker tube are analyzed experimentally and numerically in order to simplify the problem. The sectional models of the floater and the sinker tube are considered rigid. Experiments were done in a wave flume with model scale 1:10 for three net solidity ratios (Sn) and three sinker tube weights. Hydrodynamic loads on the net structure and its motion are calculated based on the screen force model proposed by Kristiansen and Faltinsen [1] and are coupled with floater and sinker tube motions in a time domain simulation. Good agreement is achieved in terms of net shape, tensions and floater motions. Large snap loads due to the elastic behavior of the net structure and the relative motion between the floater and the net are observed experimentally and predicted numerically. This type of cyclic loading has to be considered in terms of net structure failure.
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Li, Peng, Odd M. Faltinsen et Marilena Greco. « Wave-Induced Accelerations of a Fish-Farm Elastic Floater : Experimental and Numerical Studies ». Dans ASME 2014 33rd International Conference on Ocean, Offshore and Arctic Engineering. American Society of Mechanical Engineers, 2014. http://dx.doi.org/10.1115/omae2014-23302.
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Numerical simulations and experiments of an elastic circular collar of a floating fish farm are reported. The floater model without netting structure is moored with nearly horizontal moorings and tested in regular deep-water waves of different steepnesses and periods without current. Local overtopping of waves were observed in steep waves. The focus here is on the vertical accelerations along the floater in the different conditions. The experiments show that higher-order harmonics of the accelerations matter. A 3D weak-scatter model with partly nonlinear effects as well as a 3D linear frequency-domain method based on potential flow are used. From their comparison against the measurements, strong 3D and frequency dependency effects as well as flexible floater motions matter. The weak-scatter model can only partly explain the nonlinearities present in the measured accelerations.
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Gupta, Shruti, Mikhil Dange, Francois Missiaen et Animesh Kumar. « Record Setting Casing Run-In Speed Attributed to Significant Surge Reduction System Tailored for Deepwater HP/HT Operation in India ». Dans ADIPEC. SPE, 2022. http://dx.doi.org/10.2118/211489-ms.
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Abstract A major operator drilling in the Krishna-Godavari (KG) basin faced challenges attributed to tight tolerance and severe losses while running-in casing in deepwater conditions. The operator initially spent up to five days of rig time filling the casing conventionally and reducing running speeds to reach the planned depth. To help mitigate severe losses and high surge pressure caused by tight tolerance in the wellbore, the operator had to reduce the running speed and use high quantities of lost-circulation material (LCM), which caused premature conversion of float equipment from autofill mode to conventional mode (closed-ended pipe) midway, resulting in longer casing run-in time. Surge and swab analysis was conducted to validate equivalent circulating density (ECD) reduction during the casing run and derive a program of operation to safely optimize the casing run. The surge reduction float equipment package, comprised of a retained flapper valve and ball activation system, allowed the casing to autofill through large flow by areas, tolerant to the LCM in the well, while maintaining compatibility with the subsurface release plug system necessary for deepwater operations. The system allowed for midway circulation, as necessary, to help ensure the fluid level could be maintained during the casing run. The surge reduction equipment set was the first of its kind and consisted of three flapper valves distributed between the float collar and float shoe to provide the necessary redundancy to combat issues with the floats not holding because of the harsh conditions of the operation. It allowed casing to be run at optimum speed and remain within the pore pressure and fracture gradient window. A single deactivation ball installed in the float collar helped ensure the conversion of all valves in both the collar and shoe at the set flow rate, once reaching the planned casing shoe depth. This system combined with high LCM compatible subsurface plug sets not only induced zero losses while performing run in hole (RIH) casing operations (enabling 400% increased casing running speed), it also ensured consistent shoe track integrity with no float valve failure and no wet shoe; this saved several days of deepwater rig time for the operator. The first ever successful deployment of surge reduction float equipment with a subsurface release plug system in India is discussed, which reduced casing run-in time by up to 22 hours.
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Hibbeler, Jeff, Tim Graham et Jeff Ehlinger. « New Float Collar Design to Eliminate Wet Shoe Tracks ». Dans IADC/SPE Asia Pacific Drilling Technology. Society of Petroleum Engineers, 2000. http://dx.doi.org/10.2118/62751-ms.
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Vikestad, Kyrre, et Egil Lien. « A Non-Dimensional Weight-Velocity Parameter for Estimating Drag Force and Net Deformation of Gravity Fish Cages ». Dans ASME 2005 24th International Conference on Offshore Mechanics and Arctic Engineering. ASMEDC, 2005. http://dx.doi.org/10.1115/omae2005-67570.
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Most floating fish cages consist of a floating cage collar, mooring system, and net cage hanging freely down from the floater. Any current moving through the net will deform the net. This deformation depends on the current velocity, the nets ability to attract forces, and the gravity forces from weights at the lower end of the net. The forces on the net will vary with the deformation. This paper shows that for this kind of cage, a reduced velocity Vred = U·(ρ/2G)1/2, where G is the equivalent weight per area of the net, will be sufficient to estimate the drag force and deformation of the net. The present work is analytical, combined with computer simulations. The reduced velocity parameter could be used to determine the needed bottom weights. The quick estimation of the drag force on the net could be used as an input to mooring design.
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Eto, Hiroaki, Sena Shimomoto, Sachio Togawa, Morikazu Yamamoto, Shintaro Miyasawa, Junko Yamaguchi, Tomoki Ikoma, Yasuhiro Aida, Koichi Masuda et Hiroki Udagawa. « On GIS Based Selection of Suitable Site Including Cooperation With Surrounding Medical Facilities by Mesh Analysis of Floating Medical Support System on Big Disaster ». Dans ASME 2020 39th International Conference on Ocean, Offshore and Arctic Engineering. American Society of Mechanical Engineers, 2020. http://dx.doi.org/10.1115/omae2020-19026.
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Abstract The Great East Japan Earthquake that occurred in Japan in 2011, an innumerable number of buildings in the coastal part of the east side of Japan suffered catastrophic damage, and medical facilities in coastal areas have become dysfunctional because of the significant damage incurred due to the tsunami. And land routes are not passable, but there are records of support activities utilizing water areas such as sea and river networks being extremely effective in such disaster conditions. Therefore, as one of the effective methods of medical support in the affected area immediately after the disaster, a Floating Medical Support System (hereafter Medi-float) on big disaster that can be accessed from the water area was proposed. In the near future, the area along the Arakawa River is expected to be seriously damaged by the earthquake directly under the Tokyo metropolitan area. Therefore, by installing a Medi-float that can perform medical support activities from the water area to the land without being damaged by an earthquake, since Medi-float performs medical support activities in cooperation with medical facilities on land area, preventable death is reduced. In previous studies, a procedure to estimate the facilities scale and select a suitable site for Medi-float practically based on GIS data such as the number of collapsed buildings in the target area, distribution of injured people due to the earthquake were presented. However, even if Medi-float is installed in the target area, it cannot be denied that there is a shortage of medical facilities. In consideration of smooth transportation outside the region and cooperation with surrounding medical facilities, it is hoped that a concrete and realistic medical support system by Medi-float will be established. Therefore, in this study, in order to grasp the time it takes for the injured to be transported to the medical facility and the congestion status of the medical facility, the target area was divided into 250m meshes and a time-series simulation was performed. Specifically, the distribution of injured people during a disaster was calculated on a mesh basis from the number of buildings collapsed and the number of fires. And the transport time of the injured people is calculated from the distance between each mesh and the medical facility, the movement of the injured people in consideration of the congestion status of the medical facility was simulated, necessity of cooperation between medical facilities and wide area transportation was clarified, the effect of Medi-float, which is active in the disaster area, was also evaluated.
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Zaman, Mohammad, Timothy Dunn et Sandeep Tickoo. « Pump-Out Stage Tool and Pump-Out Float Collar System Enhances Completion Efficiency in Queensland Coal-Seam Gas Project : A Case Study ». Dans SPE Asia Pacific Oil and Gas Conference and Exhibition. Society of Petroleum Engineers, 2018. http://dx.doi.org/10.2118/191954-ms.
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Zhao, Lin, Fei Pan, Qian Li et Zhen Jiang. « Analysis of the Motion Characteristics of Large Non-Metallic Composite Cages ». Dans ASME 2020 39th International Conference on Ocean, Offshore and Arctic Engineering. American Society of Mechanical Engineers, 2020. http://dx.doi.org/10.1115/omae2020-18993.
Texte intégralRésumé :
Abstract A novel large reinforced HDPE cage system applied for the deep-sea aquaculture is proposed in this paper. This new structure is targeted at two main challenges facing by the deep-sea aquaculture. First, the deep-sea operation condition is much more complicated than in near shore area; second, the dynamic response and structure requirement of large-scale cages, which can be up to 80–100m in diameter and are significantly different to that of small HDPE cages. This study tackled with these two challenges by using the reinforced HDPE material and nested floating frame structure. In order to examine the integrity, safety and structure performance of this presented structure, the dynamic response of the structure subject to various working conditions are numerically simulated and analyzed in this paper. Simulation results of the new structure are compared to that of the traditional cage regarding the cage dynamic displacement, maximum strain/stress and net declination angle. The deformation results demonstrated that the maximum strain and stress on the cage collar of the new structure is much smaller than that of traditional design, and thus the new design can greatly reduce the local deformation of the cage collar and the declination angle to ensure the structure safety in severe sea conditions. The internal nested float frames can also be arranged with nets to make better use of the breeding space.