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Letteratura scientifica selezionata sul tema "Partial suitable solutions"

Autore: Grafiati

Pubblicato: 21 dicembre 2024

Ultima modifica: 19 luglio 2025

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Articoli di riviste sul tema "Partial suitable solutions"

Chamorro, Diego, and David Llerena. "Partial suitable solutions for the micropolar equations and regularity properties." Annales mathématiques Blaise Pascal 31, no. 2 (2025): 137–87. https://doi.org/10.5802/ambp.428.

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Yan, Xiaodong. "Partial Regularity of Suitable Weak Solutions of Complex Ginzburg Landau Equations." Communications in Partial Differential Equations 24, no. 11-12 (1999): 390–93. http://dx.doi.org/10.1080/03605309908821501.

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He, Cheng, and Zhouping Xin. "Partial regularity of suitable weak solutions to the incompressible magnetohydrodynamic equations." Journal of Functional Analysis 227, no. 1 (2005): 113–52. http://dx.doi.org/10.1016/j.jfa.2005.06.009.

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Ren, Wei, Yanqing Wang, and Gang Wu. "Partial regularity of suitable weak solutions to the multi-dimensional generalized magnetohydrodynamics equations." Communications in Contemporary Mathematics 18, no. 06 (2016): 1650018. http://dx.doi.org/10.1142/s0219199716500188.

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In this paper, we are concerned with the partial regularity of the suitable weak solutions to the fractional MHD equations in [Formula: see text] for [Formula: see text]. In comparison with the work of the 3D fractional Navier–Stokes equations obtained by Tang and Yu in [Partial regularity of suitable weak solutions to the fractional Navier–Stokes equations, Comm. Math. Phys. 334 (2015) 1455–1482], our results include their endpoint case [Formula: see text] and the external force belongs to a more general parabolic Morrey space. Moreover, we prove some interior regularity criteria just via the

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Tang, Lan, and Yong Yu. "Partial Regularity of Suitable Weak Solutions to the Fractional Navier–Stokes Equations." Communications in Mathematical Physics 334, no. 3 (2014): 1455–82. http://dx.doi.org/10.1007/s00220-014-2149-z.

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Wang, Xiaoming, Shehbaz Ahmad Javed, Abdul Majeed, Mohsin Kamran, and Muhammad Abbas. "Investigation of Exact Solutions of Nonlinear Evolution Equations Using Unified Method." Mathematics 10, no. 16 (2022): 2996. http://dx.doi.org/10.3390/math10162996.

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In this article, an analytical technique based on unified method is applied to investigate the exact solutions of non-linear homogeneous evolution partial differential equations. These partial differential equations are reduced to ordinary differential equations using different traveling wave transformations, and exact solutions in rational and polynomial forms are obtained. The obtained solutions are presented in the form of 2D and 3D graphics to study the behavior of the analytical solution by setting out the values of suitable parameters. The acquired results reveal that the unified method

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Zhang, Huan, Yin Zhou, and Yuhua Long. "Results on multiple nontrivial solutions to partial difference equations." AIMS Mathematics 8, no. 3 (2022): 5413–31. http://dx.doi.org/10.3934/math.2023272.

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<abstract><p>In this paper, we consider the existence and multiplicity of nontrivial solutions to second order partial difference equation with Dirichlet boundary conditions by Morse theory. Given suitable conditions, we establish multiple results that the problem admits at least two nontrivial solutions. Moreover, we provide five examples to illustrate applications of our theorems.</p></abstract>

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Jiu, Quansen, and Yanqing Wang. "Remarks on partial regularity for suitable weak solutions of the incompressible magnetohydrodynamic equations." Journal of Mathematical Analysis and Applications 409, no. 2 (2014): 1052–65. http://dx.doi.org/10.1016/j.jmaa.2013.07.052.

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Matsuzawa, Tadato. "Partial regularity and applications." Nagoya Mathematical Journal 103 (October 1986): 133–43. http://dx.doi.org/10.1017/s0027763000000623.

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The problem to determine the Gevrey index of solutions of a given hypoelliptic partial differential equation seems to be not yet well investigated. In this paper, we shall show the Gevrey indices of solutions of the equations of Grushin type, [6], are determined by a rather simple application of a straightforward extension of the results given in [7], [8] and [13]. For simplicity to construct left parametrices in the operator valued sense, we shall consider the equations under the stronger condition than that of [6] (cf. Condition 1 of Section 3). Typical examples of Grushin type are given by

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Abdelrachid, El Amrouss, Kissi Fouad, and El Mahraoui Ali. "Existence of solutions for a class of superlinear anisotropic Robin problems with variable exponent." Annals of the University of Craiova Mathematics and Computer Science Series 51, no. 2 (2024): 352–66. https://doi.org/10.52846/ami.v51i2.1828.

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In this work we study the following nonlinear anisotropic elliptic equations $$ (P)\left\{ \begin{array}{lr} -\sum_{i=1}^{N}\partial_{x_{i}}(|\partial_{x_{i}}u|^{p_{i}(x)-2}\partial_{x_{i}}u)+ |u|^{p_M(x)-2}u = f(x,u) & \quad in \quad \Omega\\ \sum_{i=1}^{N}|\partial_{x_{i}}u|^{p_{i}(x)-2}\partial_{x_{i}}u.\nu_i + \beta(x) |u|^{p_m(x)-2}u = 0 & \quad on \quad \partial\Omega. \end{array} \right.$$ We set up that the problem $(P)$ admits a sequence of weak solutions and multiplicity result under suitable conditions.

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Più fonti

Tesi sul tema "Partial suitable solutions"

Llerena, Montenegro Henry David. "Sur l'interdépendance des variables dans l'étude de quelques équations de la mécanique des fluides." Electronic Thesis or Diss., université Paris-Saclay, 2024. http://www.theses.fr/2024UPASM048.

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Cette thèse est consacrée à l'étude de la relation entre les variables dans les équations des fluides micro-polaires. Ce système, basé sur les équations de Navier-Stokes, consiste en un couplage de deux variables: le champ de vitesse vec{u} et le champ de micro-rotation vec{w}. Notre objectif est de mieux comprendre comment l'information concernant une variable influence le comportement de l'autre. À cette fin, nous avons divisé cette thèse en quatre chapitres, où nous étudierons les propriétés de régularité locale des solutions faibles de type Leray, puis nous nous concentrerons sur la régula

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Libri sul tema "Partial suitable solutions"

Šulek, Peter. Hate: Návody na cvičenia. SPEKTRUM Publishing, 2025. https://doi.org/10.61544/rzdd9325.

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The publication directly follows up on the textbook Šulek: Hate (Faculty of Civil Engineering, Slovak University of Technology in Bratislava, 2023) and is primarily intended for students of the Faculty of Civil Engineering at STU in Bratislava, specializing in Water Management and Hydraulic Structures. However, it is also suitable for students of other disciplines—such as Structural and Transportation Engineering, or Landscape Engineering and Spatial Planning. The text is designed as a guide for weir design, where each part of the design is first explained theoretically, and then each partial

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Grewal, J. S. The Akali–Congress Compromise. Oxford University Press, 2018. http://dx.doi.org/10.1093/oso/9780199467099.003.0021.

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Authorized by a convention of all Sikh parties, Master Tara Singh, with four other Sikh leaders, met Jawaharlal Nehru on 24 October 1955. Maulana Azad and G.B. Pant were also present. The talks were ‘friendly but rather vague’. On 8 February 1956, a plan, generally known as the Regional Formula, was discussed by the Sikh leaders. In his address to the All-India Akali Conference on 11 February, Master Tara Singh dwelt on Punjabi Suba as the real solution for the Punjab problem. But the Akali Dal accepted the Regional Formula in March 1956. Furthermore, the Akali Dal Working Committee resolved i

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Capitoli di libri sul tema "Partial suitable solutions"

Wolf, JÖrg. "A New Criterion for Partial Regularity of Suitable Weak Solutions to the Navier-Stokes Equations." In Advances in Mathematical Fluid Mechanics. Springer Berlin Heidelberg, 2009. http://dx.doi.org/10.1007/978-3-642-04068-9_34.

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Seifert, Christian, Sascha Trostorff, and Marcus Waurick. "Initial Value Problems and Extrapolation Spaces." In Evolutionary Equations. Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-89397-2_9.

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AbstractUp until now we have dealt with evolutionary equations of the form $$\displaystyle \big (\overline {\partial _{t,\nu }M(\partial _{t,\nu })+A}\big )U=F $$ ( ∂ t , ν M ( ∂ t , ν ) + A ¯ ) U = F for some given $$F\in L_{2,\nu }(\mathbb {R};H)$$ F ∈ L 2 , ν ( ℝ ; H ) for some Hilbert space H, a skew-selfadjoint operator A in H and a material law M defined on a suitable half-plane satisfying an appropriate positive definiteness condition with $$\nu \in \mathbb {R}$$ ν ∈ ℝ chosen suitably large. Under these conditions, we established that the solution operator, "Equation missing", is eventually independent of ν and causal; that is, if F = 0 on $$\left (-\infty ,a\right ]$$ − ∞ , a for some $$a\in \mathbb {R}$$ a ∈ ℝ , then so too is U.

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Neele, Thomas, Antti Valmari, and Tim A. C. Willemse. "The Inconsistent Labelling Problem of Stutter-Preserving Partial-Order Reduction." In Lecture Notes in Computer Science. Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-45231-5_25.

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AbstractIn model checking, partial-order reduction (POR) is an effective technique to reduce the size of the state space. Stubborn sets are an established variant of POR and have seen many applications over the past 31 years. One of the early works on stubborn sets shows that a combination of several conditions on the reduction is sufficient to preserve stutter-trace equivalence, making stubborn sets suitable for model checking of linear-time properties. In this paper, we identify a flaw in the reasoning and show with a counter-example that stutter-trace equivalence is not necessarily preserved. We propose a solution together with an updated correctness proof. Furthermore, we analyse in which formalisms this problem may occur. The impact on practical implementations is limited, since they all compute a correct approximation of the theory.

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Seifert, Christian, Sascha Trostorff, and Marcus Waurick. "Non-Autonomous Evolutionary Equations." In Evolutionary Equations. Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-89397-2_16.

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AbstractPreviously, we focussed on evolutionary equations of the form $$\displaystyle \left (\overline {\partial _{t,\nu }M(\partial _{t,\nu })+A}\right )U=F. $$ ∂ t , ν M ( ∂ t , ν ) + A ¯ U = F . In this chapter, where we turn back to well-posedness issues, we replace the material law operator M(∂t,ν), which is invariant under translations in time, by an operator of the form $$\displaystyle \mathcal {M}+\partial _{t,\nu }^{-1}\mathcal {N}, $$ ℳ + ∂ t , ν − 1 N , where both $$\mathcal {M}$$ ℳ and $$\mathcal {N}$$ N are bounded linear operators in $$L_{2,\nu }(\mathbb {R};H)$$ L 2 , ν ( ℝ ; H ) . Thus, it is the aim in the following to provide criteria on $$\mathcal {M}$$ ℳ and $$\mathcal {N}$$ N under which the operator $$\displaystyle \partial _{t,\nu }\mathcal {M}+\mathcal {N}+A $$ ∂ t , ν ℳ + N + A is closable with continuous invertible closure in $$L_{2,\nu }(\mathbb {R};H)$$ L 2 , ν ( ℝ ; H ) . In passing, we shall also replace the skew-selfadjointness of A by a suitable real part condition. Under additional conditions on $$\mathcal {M}$$ ℳ and $$\mathcal {N}$$ N , we will also see that the solution operator is causal. Finally, we will put the autonomous version of Picard’s theorem into perspective of the non-autonomous variant developed here.

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Seifert, Christian, Sascha Trostorff, and Marcus Waurick. "Examples of Evolutionary Equations." In Evolutionary Equations. Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-89397-2_7.

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AbstractThis chapter is devoted to a small tour through a variety of evolutionary equations. More precisely, we shall look into the equations of poro-elastic media, (time-)fractional elasticity, thermodynamic media with delay as well as visco-elastic media. The discussion of these examples will be similar to that of the examples in the previous chapter in the sense that we shall present the equations first, reformulate them suitably and then apply the solution theory to them. The study of visco-elastic media within the framework of partial integro-differential equations will be carried out in the exercises section.

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Xu, Liu-Jun, and Ji-Ping Huang. "Theory for Invisible Thermal Sensors: Optimization Scheme." In Transformation Thermotics and Extended Theories. Springer Nature Singapore, 2022. http://dx.doi.org/10.1007/978-981-19-5908-0_12.

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AbstractMetamaterial-based devices have been extensively explored for their intriguing functions, such as cloaking, concentrating, rotating, and sensing. However, they are usually achieved by employing metamaterials with extreme parameters, critically restricting engineering preparation. In this chapter, we propose an optimization model with particle swarm algorithms to simplify parametric designs to realize bilayer thermal sensors composed of bulk isotropic materials (circular structure). For this purpose, the fitness function is defined to evaluate the difference between the actual and expected temperatures. By choosing suitable materials for different regions and treating the sensor, inner shell, and outer shell radii as design variables, we finally minimize the fitness function via particle swarm optimization. The designed scheme is easy to implement in applications and shows excellent performances in detective accuracy and thermal invisibility, which are confirmed by finite-element simulations and laboratory experiments. The optimization model can also be flexibly extended to a square case. This method can calculate numerical solutions for difficult analytical theories (circular structure) and optimal solutions for problems without analytical theories (such as square structure), providing new inspiration for simplifying the design of metamaterials in various communities.

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Limone, Pierpaolo, and Giusi Antonia Toto. "The Motivation of Distance Learning in Universities Since Covid- 19 Outbreak." In Psychology, Learning, Technology. Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-031-15845-2_2.

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AbstractAround midmonth March 2020, The World Health Organization acknowledged the COVID outbreak as a “public health emergency of international concern.” Worldwide, various heads of state-imposed mandatory lockdowns to curb and ease the spread of the disease. With such restrictions in hand, the education sector was among the many which felt the pinch brought about by the restriction measures imposed. To try and flatten the curve and minimize the spreading of the virus from one person to another, there was a need for reduced physical contact among people. According to Shahzad et al. (2020), public gatherings such as parties, religious services, social amenities, political gatherings, and physical learning for both universities and lower levels stopped since health comes first before anything else. With that in hand, the world had to look for suitable solutions to cope with the pandemic since the virus was not ending time soon; as a result, the globe adapted ‘the new normal of life. In response, education facilities had to embark on e-learning since life had to continue, which is great gratitude to technology. However, it brought about various issues that we will try and highlight since a change in anything is always accompanied by multiple challenges.

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Temple, Lucy, and Gregor Eibl. "Evaluating Digital Government Projects: Emphasizing Process and Relevance Through Transdisciplinary Research." In From Electronic to Mobile Government. Springer Nature Switzerland, 2024. http://dx.doi.org/10.1007/978-3-031-64471-9_8.

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AbstractGovernment organizations worldwide focus on digital solutions to improve public services and enhance citizen experience. These initiatives continue to receive significant resource allocation. There exists the need for a thorough evaluation to ensure that these projects deliver the intended benefits and address citizen needs. Currently, the absence of a single suitable evaluation method poses a challenge. The complexity of these projects demands a dynamic evaluation environment to understand societal impact and relevance. Relevance implies assessing to what extent a project aligns with the stakeholders’ goals, needs, and desires, mainly government organizations and citizens or businesses. This chapter explores the importance of relevance in evaluating such projects and highlights the reasons for adopting a transdisciplinary research approach. Unlike traditional disciplinary-focused approaches, transdisciplinary research focuses on real-world context and interdisciplinarity, goes beyond just science, and promotes interaction and integration among involved parties to produce high relevance. By focusing on project outcomes and processes, this research aims to propose relevant metrics for evaluating digital government projects and their relevance in a real-world context. To do so, a series of European research and development projects focusing on digital government will be analyzed using the proposed transdisciplinary evaluation framework to understand if outcomes and processes promote project relevance. This research will help enhance current evaluation approaches for digital government projects. The findings of this study will contribute to the widening of evaluation frameworks for digital government initiatives.

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Chakrabortty, Pradipta, Nitish Jauhari, Raja Kumar, and Diego Maria Barbieri. "Sustainable Vibration Screening with Dual Trenches Infilled with Geofoam and Aggregate: Full-Scale Field Experiments." In Lecture Notes in Civil Engineering. Springer Nature Switzerland, 2025. https://doi.org/10.1007/978-3-031-69626-8_122.

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AbstractGround-borne vibrations resulting from various civil engineering activities can cause detrimental impacts on the nearby structures. Therefore, past studies have concentrated on developing vibration mitigation techniques. Vibration screening using wave barriers is a widely accepted approach, and continuous research has been ongoing in the last few decades. However, the current solutions to the problem are limited to the use of single trenches, and only limited experimental studies on open and geofoam-infilled have explored the possibilities of utilizing dual trenches. In some practical scenarios, the recommended depth of a single trench is unimplementable; further, no significant work has been observed to find suitable infill materials in screening the vibrations induced due to harmonic loading under dual trench scenarios. Hence, the current study aims to experimentally investigate the potential of dual trenches infilled with sustainable materials to mitigate the vibrations induced due to continuous harmonic loading. The influence of the filling accomplished by two types of material, namely, a softer one like geofoam (G) and a stiffer one like aggregate (A), has been evaluated and compared to the soil. Thereafter, these materials were interchanged in the trenches. The harmonic loading was applied using a Lazan-type mechanical oscillator. The associated vertical particle acceleration due to wave propagation was captured using an accelerometer positioned at a distance of 1 m from the second trench. The results indicate that infilling the first trench with aggregate improves isolation efficacy. Furthermore, the optimal depth required to reach an amplitude reduction ratio of 0.25 was observed as 0.25LR (LR= Rayleigh wavelength) and 0.34LR for the dual trenches filled with aggregate and geofoam (A + G), and geofoam and aggregate (G + A), respectively.

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Law, D. W., C. Gunasekara, and S. Setunge. "Use of Brown Coal Ash as a Replacement of Cement in Concrete Masonry Bricks." In Lecture Notes in Civil Engineering. Springer Nature Singapore, 2023. http://dx.doi.org/10.1007/978-981-99-3330-3_4.

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AbstractPortland cement production is not regarded as environmentally friendly, because of its associated high carbon emissions, which are responsible for 5% of global emissions. An alternative is to substitute fly ash for Portland cement. Australia has an abundance of brown coal fly ash, as it is the main source of primary energy in the State of Victoria. Currently, the majority of this material is stored in landfills and currently there is no commercial use for it in the cement industry because brown coal fly ash cannot be used as a direct replacement material for Portland cement due to the high sulfur and calcium content and low aluminosilicate content. However, the potential exists to use brown coal fly ash as a geopolymeric material, but there remains a significant amount of research needed to be conducted. One possible application is the production of geopolymer concrete bricks. A research project was undertaken to investigate the use of brown coal fly ash from Latrobe Valley power stations in the manufacture of geopolymer masonry bricks. The research developed a detailed understanding of the fundamental chemistry behind the activation of the brown coal fly ash and the reaction mechanisms involved to enable the development of brown coal fly ash geopolymer concrete bricks. The research identified suitable manufacturing techniques to investigate relationships between compressive strength and processing parameters and to understand the reaction kinetics and microstructural developments. The first phase of the research determined the physical, chemical, and mineralogical properties of the Loy Yang and Yallourn fly ash samples to produce a 100% fly ash-based geopolymer mortar. Optimization of the Loy Yang and Yallourn geopolymer mortars was conducted to identify the chemical properties that were influential in the production of satisfactory geopolymer strength. The Loy Yang mortars were able to produce characteristic compressive strengths acceptable in load-bearing bricks (15 MPa), whereas the Yallourn mortars produced characteristic compressive strengths only acceptable as non-load-bearing bricks (5 MPa). The second phase of the research transposed the optimal geopolymer mortar mix designs into optimal geopolymer concrete mix designs while merging the mix design with the optimal Adbri Masonry (commercial partner) concrete brick mix design. The reference mix designs allowed for optimization of both the Loy Yang and Yallourn geopolymer concrete mix designs, with the Loy Yang mix requiring increased water content because the original mix design was deemed to be too dry. The key factors that influenced the compressive strength of the geopolymer mortars and concrete were identified. The amorphous content was considered a vital aspect during the initial reaction process of the fly ash geopolymers. The amount of unburnt carbon content contained in the fly ash can hinder the reactive process, and ultimately, the compressive strength because unburnt carbon can absorb the activating solution, thus reducing the particle to liquid interaction ratio in conjunction with lowering workability. Also, fly ash with a higher surface area showed lower flowability than fly ash with a smaller surface area. It was identified that higher quantity of fly ash particles <45 microns increased reactivity whereas primarily angular-shaped fly ash suffered from reduced workability. The optimal range of workability lay between the 110–150 mm slump, which corresponded with higher strength displayed for each respective precursor fly ash. Higher quantities of aluminum incorporated into the silicate matrix during the reaction process led to improved compressive strengths, illustrated by the formation of reactive aluminosilicate bonds in the range of 800–1000 cm–1 after geopolymerization, which is evidence of a high degree of reaction. In addition, a more negative fly ash zeta potential of the ash was identified as improving the initial deprotonation and overall reactivity of the geopolymer, whereas a less negative zeta potential of the mortar led to increased agglomeration and improved gel development. Following geopolymerization, increases in the quantity of quartz and decreases in moganite correlated with improved compressive strength of the geopolymers. Overall, Loy Yang geopolymers performed better, primarily due to the higher aluminosilicate content than its Yallourn counterpart. The final step was to transition the optimal geopolymer concrete mix designs to producing commercially acceptable bricks. The results showed that the structural integrity of the specimens was reduced in larger batches, indicating that reactivity was reduced, as was compressive strength. It was identified that there was a relationship between heat transfer, curing regimen and structural integrity in a large-volume geopolymer brick application. Geopolymer bricks were successfully produced from the Loy Yang fly ash, which achieved 15 MPa, suitable for application as a structural brick. Further research is required to understand the relationship between the properties of the fly ash, mixing parameters, curing procedures and the overall process of brown coal geopolymer concrete brick application. In particular, optimizing the production process with regard to reducing the curing temperature to ≤80 °C from the current 120 °C and the use of a one-part solid activator to replace the current liquid activator combination of sodium hydroxide and sodium silicate.

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Atti di convegni sul tema "Partial suitable solutions"

Kanki, Kyohei, Hiroki Kamitani, and Hisashi Amaya. "Corrosion Resistance of CRA for CCS Applications under O2, SO2 and Practical Mixed Gas Conditions at Different Chloride Levels." In CONFERENCE 2025. NACE International, 2025. https://doi.org/10.5006/c2025-00004.

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Abstract In carbon dioxide capture and storage (CCS), CO2 emitted from various industrial sources, for example fossil-fuel power plants, is captured and injected into the subsurface in a dense or supercritical phase through injection strings. This transported CO2 may contain impurities, such as SOx, NOx, O2. To evaluate the corrosion resistance of CRAs for injection tubing in supercritical CO2 with O2, SO2, and practical mixture of gases, corrosion tests were performed under conditions in 5, 15 and 25 wt% NaCl solutions saturated with CO2. Corrosion resistance of Super Martensitic Stainless St

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Sagara, Masayuki, Akiko Tomio, Daisuke Matsuo, and Hisashi Amaya. "Study on Effect of Buffer Capacity on Corrosion Performance of CRAs in Simulated Well Condition." In CORROSION 2017. NACE International, 2017. https://doi.org/10.5006/c2017-09283.

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Abstract The methodology to simulate or realize an actual oil and gas field condition in laboratory tests is important to evaluate the actual corrosion performance of materials. The environmental factors such as partial pressure of H2S and CO2, temperature, concentration of chloride ion and pH of the solution are essential to define the severity of corrosion condition. To consider the initiation of localized corrosion such as pitting or cracking in Corrosion Resistant Alloys (CRAs), it is important to research the stability of the passive film such as depassivation pH of the materials. One of

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Siegmund, Gerit, W. Bruckoff, G. Schmitt, U. Pankoke, and B. Sadlowsky. "Influence of Material Properties and Laboratory Test Conditions on Sohic at Line Pipe Carbon Steels." In CORROSION 1998. NACE International, 1998. https://doi.org/10.5006/c1998-98260.

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Abstract Stress oriented hydrogen induced cracking (SOHIC) is a cracking mechanism typical for of low strength line pipe carbon steels. The paper reports on investigations to find experimental conditions suitable to study medium and materials related parameters influencing the SOHIC susceptibility of steel. It was not possible to identify medium conditions that produce SOHIC at stressed, unnotched samples under 1 bar (O.1 MPa) hydrogen sulfide. Increasing the test severity by filming 4-point bend or tensile specimens with a low concentrated aqueous salt solution instead of submerging them in t

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Scoppio, L., M. Barteri, and C. Leali. "Sulphide Stress Cracking Resistance of Superduplex Stainless Steels in Oil & Gas Field Simulated Environments." In CORROSION 1998. NACE International, 1998. https://doi.org/10.5006/c1998-98095.

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Abstract The need to improve stress corrosion cracking resistance in H2S/CO2/Cl-, at reasonably low prices and good mechanical properties, has led in the last decade to develop a plethora of superduplex stainless steels for sour oilfield environments application. The outstanding performance of superduplex stainless steels to SSC corrosion is diminished with the increase of chloride concentration and H2S partial pressure. In this work the performance of superduplex steel in very harsh oilfield simulated environments (H2S up to 20 psi (155 kPa), NaCl 25% and 80°C) were verified. Experimental wor

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Zhao, Jinggen, and Chengjian He. "Real-Time Simulation of Coaxial Rotor Configurations with Combined Finite State Dynamic Wake and VPM." In Vertical Flight Society 70th Annual Forum & Technology Display. The Vertical Flight Society, 2014. http://dx.doi.org/10.4050/f-0070-2014-9567.

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This paper describes a first-principle based finite state dynamic rotor wake model that addresses the complex aerodynamic interference inherent to coaxial rotor configurations in support of advanced vertical lift aircraft simulation, design, and analysis. The high fidelity rotor dynamic wake solution combines an enhanced real-time finite state dynamic wake model (DYW) with a first-principle based viscous Vortex Particle Method (VPM). The finite state dynamic wake model provides a state-space real-time modeling capability for advanced rotorcraft configurations and VPM provides a first-principle

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Ning, Jing, Hui Li, Yuhchae Yoon, and Sridhar Srinivasan. "Review of Key Factors Related to Sour Service Material Selection for HPHT Oil & Gas Production Applications." In CORROSION 2019. NACE International, 2019. https://doi.org/10.5006/c2019-13400.

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Abstract Failure of Oil Country Tubular Goods (OCTG) steels in highly sour applications often stems from corrosion and Environmentally-Assisted Cracking (EAC). EAC of high strength low alloy carbon steels, typically used in well completions, has been a problem of major concern for the reliable exploitation of reservoirs that produce or condense significant amounts of water alongside dissolved CO2 and H2S. A critical issue in selecting OCTG steels, considered suitable for sour service evaluation, is selection of representative laboratory conditions of the actual High Pressure High Temperature (

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Wagner, Marcus M., Peter M. Pinsky, and Manish Malhotra. "A Multiple-Frequency Partial-Field Method for Exterior Acoustics Based on Padé via Lanczos Approximants." In ASME 2001 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2001. http://dx.doi.org/10.1115/imece2001/nca-23524.

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Abstract A solution methodology is introduced for the efficient computation of the acoustic field over restricted domains and for a frequency window. Typically, such partial field solutions include, for example, surfaces enclosing the radiating structure or even single points in the computational domain. The multiple-frequency partial-field (MFPF) method starts out by reformulating the finite element matrix system into a suitable shifted form. The DtN map is used as a radiation boundary condition and is interpreted as a low rank update of the matrix problem. The shifted standard form is then a

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Lu, Xiancheng, and Chuen-Sen Lin. "A Proposed Method to Group the Solutions From Dimensional Synthesis: Planar Triads for Six Precision Position." In ASME 1992 Design Technical Conferences. American Society of Mechanical Engineers, 1992. http://dx.doi.org/10.1115/detc1992-0332.

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Abstract In this paper, a method has been proposed to group into six sets the infinite number of solutions from dimensional synthesis of planar triads for six precision positions. The proposed method reveals the relationships between the different configurations of the compatibility linkage and the sets of numerical solutions from dimensional synthesis. By checking the determinant signs and the contunities of values of the sub-Jacobian matrices and their derivatives with respect to the independent angular displacement for all constraint sets in the compatibility linkage, it enables the compute

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Dzbor, Martin, and Zdenek Zdrahal. "Towards Logical Framework for Sequential Design." In ASME 2001 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. American Society of Mechanical Engineers, 2001. http://dx.doi.org/10.1115/detc2001/dtm-21710.

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Abstract Engineering design is usually seen as a knowledge-intensive process that driven by certain objectives eventually delivers an artefact having the desired properties or functions. Design is inherently iterative and the design goals evolve together with the solutions. Many current design theories present more or less efficient ways for finding a suitable solution to the given goals. However, they often leave open the question of the ‘solution talkback’. Under ‘solution talkback’ we understand the reasoning process that is able to infer what formal amendments to the initial design specifi

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Berge, Frode, Marcus Fathi, Anne Mette Rød, and Tomas Fjelde. "A Short Summary of Retrofit Multilateral Technology Implementation." In SPE/IADC International Drilling Conference and Exhibition. SPE, 2023. http://dx.doi.org/10.2118/212541-ms.

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Abstract On the Norwegian Continental Shelf there are many fields and wells in late life production. There are also many nearby drilling targets with limited volumes to add. This situation requires new mindset in order to optimize tie-ins of new reserves to existing infrastructure. Retrofit multilateral well solutions are regarded as one enabeler in this context since they enable tie-in to existing producers from nearby targets through deep sidetrack operations. There are many pre-requisites that must be in place for such solutions to be suitable. In addition, the risk of partial success invol

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Rapporti di organizzazioni sul tema "Partial suitable solutions"

Delaney, Kathleen, Mark Mendelsohn, Sarah Wenner, et al. Protocol for the reintroduction of California red-legged frogs to Santa Monica Mountains National Recreation Area. National Park Service, 2023. http://dx.doi.org/10.36967/2297287.

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Once common and widespread in Southern California, California red-legged frogs (Rana draytonii) began declining sometime in the middle of the 20th century. They were listed as threatened under the Endangered Species Act in 1996. Three small and isolated populations remained in Los Angeles and Ventura Counties by the start of the 21st century. The nearest population of California red-legged frogs to Santa Monica Mountains National Recreation Area is critically small, located 15 km to the north, yet there is evidence of persistence, including successful reproduction each year it has been measure

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Reisch, Bruce, Avichai Perl, Julie Kikkert, Ruth Ben-Arie, and Rachel Gollop. Use of Anti-Fungal Gene Synergisms for Improved Foliar and Fruit Disease Tolerance in Transgenic Grapes. United States Department of Agriculture, 2002. http://dx.doi.org/10.32747/2002.7575292.bard.

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Original objectives . 1. Test anti-fungal gene products for activity against Uncinula necator, Aspergillus niger, Rhizopus stolonifer and Botrytis cinerea. 2. For Agrobacterium transformation, design appropriate vectors with gene combinations. 3. Use biolistic bombardment and Agrobacterium for transformation of important cultivars. 4. Characterize gene expression in transformants, as well as level of powdery mildew and Botrytis resistance in foliage of transformed plants. Background The production of new grape cultivars by conventional breeding is a complex and time-consuming process. Transfer

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