Academic literature on the topic 'J/psi COMPASS'
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Journal articles on the topic "J/psi COMPASS"
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Correa, Ernesto, and Arturo de Pablo. "Remarks on a nonlinear nonlocal operator in Orlicz spaces." Advances in Nonlinear Analysis 9, no. 1 (2019): 305–26. http://dx.doi.org/10.1515/anona-2020-0002.
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Abstract We study integral operators $\mathcal{L}u\left( \chi \right)=\int{_{_{\mathbb{R}}\mathbb{N}}\psi \left( u\left( x \right)-u\left( y \right) \right)J\left( x-y \right)dy}$of the type of the fractional p-Laplacian operator, and the properties of the corresponding Orlicz and Sobolev-Orlicz spaces. In particular we show a Poincaré inequality and a Sobolev inequality, depending on the singularity at the origin of the kernel J considered, which may be very weak. Both inequalities lead to compact inclusions. We then use those properties to study the associated elliptic problem $\mathcal{L}u=f$in a bounded domain $\Omega ,$and boundary condition u ≡ 0 on ${{\Omega }^{c}};$both cases f = f(x) and f = f(u) are considred, including the generalized eigenvalue problem $f\left( u \right)=\lambda \psi \left( u \right).$
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Zhou, Mi, Naeem Saleem, Xiao-lan Liu, and Nihal Özgür. "On two new contractions and discontinuity on fixed points." AIMS Mathematics 7, no. 2 (2022): 1628–63. http://dx.doi.org/10.3934/math.2022095.
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<abstract><p>This paper deals with a well known open problem raised by Kannan (Bull. Calcutta Math. Soc., 60: 71–76, 1968) and B. E. Rhoades (Contemp. Math., 72: 233–245, 1988) on the existence of general contractions which have fixed points, but do not force the continuity at the fixed point. We propose some new affirmative solutions to this question using two new contractions called $ (\psi, \varphi) $-$ \mathcal{A} $-contraction and $ (\psi, \varphi) $-$ \mathcal{A^{\prime}} $-contraction inspired by the results of H. Garai et al. (Applicable Analysis and Discrete Mathematics, 14(1): 33–54, 2020) and P. D. Proinov (J. Fixed Point Theory Appl. (2020) 22: 21). Some new fixed point and common fixed point results in compact metric spaces and also in complete metric spaces are proved in which the corresponding contractive mappings are not necessarily continuous at their fixed points. Moreover, we show that new solutions to characterize the completeness of metric spaces. Several examples are provided to verify the validity of our main results.</p></abstract>
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Nettelmann, N., N. Movshovitz, D. Ni, et al. "Theory of Figures to the Seventh Order and the Interiors of Jupiter and Saturn." Planetary Science Journal 2, no. 6 (2021): 241. http://dx.doi.org/10.3847/psj/ac390a.
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Abstract Interior modeling of Jupiter and Saturn has advanced to a state where thousands of models are generated that cover the uncertainty space of many parameters. This approach demands a fast method of computing their gravity field and shape. Moreover, the Cassini mission at Saturn and the ongoing Juno mission delivered gravitational harmonics up to J 12. Here we report the expansion of the theory of figures, which is a fast method for gravity field and shape computation, to the seventh order (ToF7), which allows for computation of up to J 14. We apply three different codes to compare the accuracy using polytropic models. We apply ToF7 to Jupiter and Saturn interior models in conjunction with CMS-19 H/He equation of state. For Jupiter, we find that J 6 is best matched by a transition from an He-depleted to He-enriched envelope at 2–2.5 Mbar. However, the atmospheric metallicity reaches 1 × solar only if the adiabat is perturbed toward lower densities, or if the surface temperature is enhanced by ∼14 K from the Galileo value. Our Saturn models imply a largely homogeneous-in-Z envelope at 1.5–4 × solar atop a small core. Perturbing the adiabat yields metallicity profiles with extended, heavy-element-enriched deep interior (diffuse core) out to 0.4 R Sat, as for Jupiter. Classical models with compact, dilute, or no core are possible as long as the deep interior is enriched in heavy elements. Including a thermal wind fitted to the observed wind speeds, representative Jupiter and Saturn models are consistent with all observed J n values.
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Chen, Dan-Ni, Jing Cheng, Xiao Shen, and Pan Zhang. "Semi-stable quiver bundles over Gauduchon manifolds." AIMS Mathematics 8, no. 5 (2023): 11546–56. http://dx.doi.org/10.3934/math.2023584.
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<abstract><p>In this paper, we prove the existence of the approximate $ (\sigma, \tau) $-Hermitian Yang-Mills structure on the $ (\sigma, \tau) $-semi-stable quiver bundle $ \mathcal{R} = (\mathcal{E}, \phi) $ over compact Gauduchon manifolds. An interesting aspect of this work is that the argument on the weakly $ L^{2}_1 $-subbundles is different from [Álvarez-Cónsul and García-Prada, Comm. Math. Phys., 2003] and [Hu-Huang, J. Geom. Anal., 2020].</p></abstract>
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Reed, J., J. S. De Ropp, J. Trewhella, et al. "Conformational analysis of PKI(5–22)amide, the active inhibitory fragment of the inhibitor protein of the cyclic AMP-dependent protein kinase." Biochemical Journal 264, no. 2 (1989): 371–80. http://dx.doi.org/10.1042/bj2640371.
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Fourier-transform i.r. spectroscopy, 1H-n.m.r. spectroscopy and X-ray scattering were used to study the conformation and shape of the peptide PKI(5-22)amide, which contains the active site of the inhibitor protein of the cyclic AMP-dependent protein kinase [Cheng, Van Pattern, Smith & Walsh (1985) Biochem. J. 231, 655-661]. The X-ray-scattering solution studies show that the peptide has a compact structure with Rg 0.9 nm (9.0 A) and a linear maximum dimension of 2.5 nm (25A). Compatible with this, Fourier-transform i.r. and n.m.r. determinations indicate that the peptide contains approx. 26% alpha-helix located in the N-terminal one-third of the molecule. This region contains the phenylalanine residue that is one essential recognition determinant for high-affinity binding to the protein kinase catalytic site.
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Gutiérrez, C., R. Freire, M. Salas, and J. M. Hermoso. "Assembly of phage phi 29 genome with viral protein p6 into a compact complex." EMBO Journal 13, no. 1 (1994): 269–76. http://dx.doi.org/10.1002/j.1460-2075.1994.tb06257.x.
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Hasanov, Alemdar, Onur Baysal, and Hiromichi Itou. "Identification of an unknown shear force in a cantilever Euler–Bernoulli beam from measured boundary bending moment." Journal of Inverse and Ill-posed Problems 27, no. 6 (2019): 859–76. http://dx.doi.org/10.1515/jiip-2019-0020.
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Abstract An inverse problem of identifying an unknown shear force {g(t)} on the inaccessible boundary {x=l} in a system governed by the general form Euler–Bernoulli beam equation \rho(x)u_{tt}+\mu(x)u_{t}+(r(x)u_{xx})_{xx}=0,\quad(x,t)\in(0,l)\times(0,T) subject to the boundary conditions u(0,t)=u_{x}(0,t)=0,\quad u_{xx}(l,t)|_{x=l}=0,\quad-(r(x)u_{xx}(x,t))_{x}|_{x% =l}=g(t), is studied. The bending moment {\mathtt{M}(t)\coloneq-r(0)u_{xx}(0,t)} given at the accessible boundary {x=0} is assumed to be a measured output. The Neumann-to-Neumann operator \Phi[\,{\cdot}\,]\colon\mathcal{G}\subset H^{p}(0,l)\mapsto L^{2}(0,T),\quad(% \Phi g)(t)\coloneq-r(0)u_{xx}(0,t_{g}) corresponding to this inverse problem is shown to be compact ( {p=3} ) and Lipschitz continuous ( {p=2} ). These properties allow us to prove the existence of a solution of the minimization problem for the Tikhonov functional {J(g)\coloneq\lVert\Phi g-\mathtt{M}\rVert^{2}_{L^{2}(0,T)}} . It is proved that this functional is Fréchet differentiable. Furthermore, an explicit formula for the Fréchet gradient of this functional is derived by making use of the unique solution to corresponding adjoint problem. A numerical method based on Hermitian finite elements and conjugate gradient algorithm is developed for the solution of the inverse boundary value problem. Numerical examples with random noisy measured outputs are presented to illustrate the validity and effectiveness of the proposed approach.
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Guan, Xinyu, and Nan Kang. "Stability for Cauchy problem of first order linear PDEs on $ \mathbb{T}^m $ with forced frequency possessing finite uniform Diophantine exponent." AIMS Mathematics 9, no. 7 (2024): 17795–826. http://dx.doi.org/10.3934/math.2024866.
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<abstract><p>In this paper, we studied the stability of the Cauchy problem for a class of first-order linear quasi-periodically forced PDEs on the $ m $-dimensional torus:</p> <p><disp-formula> <label/> <tex-math id="FE1"> \begin{document}$ \begin{eqnarray*} \left\{ \begin{array}{l} \partial_t u+(\xi+f(x, \omega t, \xi))\cdot \partial_x u = 0, \\ u(x, 0) = u_0(x), \ \end{array} \right. \end{eqnarray*} $\end{document} </tex-math></disp-formula></p> <p>where $ \xi\in \mathbb{R}^m, x\in \mathbb{T}^m, \omega\in\mathbb{R}^d, $ in the case of multidimensional Liouvillean forced frequency. We proved that for each compact set $ \mathcal{O}\in\mathbb{R}^m $ there exists a Cantor subset $ \mathcal{O}_\gamma $ of $ \mathcal{O} $ with positive Lebesgue measure such that if $ \xi\in\mathcal{O}_\gamma, $ then for a perturbation $ f $ being small in some analytic Sobolev norm, there exists a bounded and invertible quasi-periodic family of linear operator $ \Psi(\omega t) $, such that the above PDEs are reduced by the transformation $ v: = \Psi(\omega t)^{-1}[u] $ into the following PDE:</p> <p><disp-formula> <label/> <tex-math id="FE2"> \begin{document}$ \begin{eqnarray*} \partial_t v+ (\xi+ m_\infty(\omega t))\cdot\partial_x v = 0, \end{eqnarray*} $\end{document} </tex-math></disp-formula></p> <p>provided that the forced frequency $ \omega\in \mathbb{R}^d $ possesses finite <italic>uniform Diophantine exponent</italic>, which allows Liouvillean frequency. The reducibility can immediately cause the stability of the above Cauchy problem, that is, the analytic Sobolev norms of the Cauchy problem are controlled uniformly in time. The proof is based on a finite dimensional Kolmogorov-Arnold-Moser (KAM) theory for quasi-periodically forced linear vector fields with multidimensional Liouvillean forced frequency. As we know, the results on Liouvillean frequency existing in the literature deal with two-dimensional frequency and exploit the theory of continued fractions to control the small divisor problem. The results in this paper partially extend the analysis to higher-dimensional frequency and impose a weak nonresonance condition, i.e., the forced frequency $ \omega $ possesses finite <italic>uniform Diophantine exponent</italic>. Our result can be regarded as a generalization of analytic cases in the work [R. Feola, F. Giuliani, R. Montalto and M, Procesi, Reducibility of first order linear operators on tori via Moser's theorem, <italic>J. Funct. Anal.</italic>, 2019] from Diophantine frequency to Liouvillean frequency.</p></abstract>
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Jayarama, H. R., C. N. Chaithra, and S. H. Naveenkumar. "The uniqueness and value distribution of meromorphic functions with different types of differential-difference polynomials sharing a small function IM." Matematychni Studii 62, no. 2 (2024): 141–54. https://doi.org/10.30970/ms.62.2.141-154.
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This paper delves into the uniqueness of finite-order meromorphic functions \(f(z)\) and \(g(z)\) over the extended complex plane, particularly when these functions share a small function \(a(z)\) under specific conditions. The study reveals new insights with significant applications, such as classifying different complexes within \(\mathbb{C}\) based on their uniqueness. The primary goal is to explore the uniqueness of meromorphic functions that share a small function \(a(z)\) in the sense of IM (ignoring multiplicities) while constrained by finite order, alongside certain types of differential-difference polynomials. We focus on two non-constant meromorphic functions \(f(z)\) and \(g(z)\) of finite order, under the assumption that a small function \(a(z)\), relative to \(f(z)\), plays a crucial role in the analysis. The investigation centers on the uniqueness properties of a~specific type of differential-difference polynomial of the form \([f^{n}P[f]H(z,f)]\), where \(P[f]\) is a~differential polynomial of \(f(z)\) and \(H(z, f)\) is a difference polynomial of \(f(z)\), both defined in the equations \(\eqref{*}\) and \(\eqref{**}\), respectively. Importantly, these polynomials do not vanish identically and do not share common zeros or poles with either \(f(z)\) or \(g(z)\). The paper establishes conditions on several parameters, including \(k\), \(n\), \(\overline{d}(P)\), \(\Psi\), \(Q\), \(t\), and \(\xi\), under which the shared value properties between \(f(z)\) and \(g(z)\) lead to two possible outcomes: either \(f(z)\) is a constant multiple of \(g(z)\), or \(f(z)\) and \(g(z)\) satisfy a specific algebraic difference equation. This result contributes to a~deeper understanding of the relationship between shared values and the structural properties of meromorphic functions. As an application, the paper extends several previous results on meromorphic functions, including those by Dyavanal and M. M. Mathai, published in the Ukr. Math. J. (2019). Furthermore, by citing a particular example, we demonstrate that the established results hold true only under specific cases, highlighting the precision of the theorem. Finally, we offer a more compact version of the main theorem as an enhancement, providing a~refined perspective on the uniqueness problem in the context of meromorphic functions.
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BARROS, RAFAEL C. DE, BIANCA PIRACCINI SILVA, and CARLOS E. DE ALVARENGA JULIO. "Description of the male of Antodice quadrimaculata Martins & Galileo, 2003 (Coleoptera, Cerambycidae, Lamiinae), with new country record for the species." Zootaxa 4377, no. 4 (2018): 577. http://dx.doi.org/10.11646/zootaxa.4377.4.7.
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The genus Antodice Thomson, 1864 was revised by Martins & Galileo (1998) and currently includes 27 species (Tavakilian & Chevillotte 2017), distributed from Mexico to southern South America. Based on a single female specimen collected in Arroyo Cristal, Ka'azapá, Paraguay, the species Antodice quadrimaculata was first described by Martins & Galileo in 2003. The holotype specimen was collected on 20 November 1999 by J. Jensen and is deposited in the Museum of Zoology of the University of São Paulo, Brazil. With the help of Carlos Aguilar, from Paraguay’s National Museum of Natural History, we were able to determine the exact location where the holotype was collected. With the collection and the description of the male, presented herein, we describe the male of this species record its occurrence in Brazil, a new country record.We identified this species as belonging to the group of Antodice species with yellowish flagellomeres and a black apex, resembling Antodice venustula Lane, 1973 in its elytral color pattern. In A. venustula, the elytra are covered with whitish pubescence and exhibit only two patches of compact white pubescence. In A. quadrimaculata, according to Martins & Galileo (2003), the elytra are of a reddish color with whitish pubescence on the dorsal anterior area and close to the apexes, and they also have three patches of compact white pubescence. The specimens of A. quadrimaculata cited herein were collected in the Iguaçu National Park (Parque Nacional do Iguaçu—PNI), the largest fragment of Atlantic forest in southern Brazil, located in the western region of the state of Paraná. The insects were collected using light traps, set up on nights with a new moon. The artificial light source was a 500-Watt incandescent lamp powered by a Honda EP 2500 generator. Sampling began at 6 p.m., ending between midnight and 3 a.m. the next day. The studied material was deposited in the entomological collection of the Museum of Zoology at the State University of Londrina (Universidade Estadual de Londrina), Londrina, Brazil (MZUEL). To better represent the expansion of the geographical distribution of the species from the holotype recorded in Paraguay (Fig. 5, 6), the cartographic material (Fig. 1) was produced using ArcGIS Software 9.0®. The map database was obtained from the Institute of Land, Cartography and Geosciences, (Instituto de Terras, Cartografia e Geologia do Paraná), Curitiba, Brazil (ITCG).
Dissertations / Theses on the topic "J/psi COMPASS"
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MATOUSEK, JAN. "Nucleon spin structure studies in Drell–Yan process at COMPASS." Doctoral thesis, Università degli Studi di Trieste, 2018. http://hdl.handle.net/11368/2924918.
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The nucleon structure is presently described by Transverse Momentum Dependent (TMD) Parton Distribution Functions (PDFs), which generalise the collinear PDFs, adding partonic spin and transverse momentum degrees of freedom. The recent HERMES and COMPASS data on hadron production in deep inelastic scattering (SIDIS) of leptons off transversely polarised nucleons have provided a decisive validation of this framework. Nevertheless, the TMD PDFs should be studied in complementary reactions, like pp hard scattering and Drell-Yan processes. In particular the Sivers TMD PDF, which encodes the correlation between the nucleon spin and quark transverse momentum and appears in the Sivers Transverse Spin Asymmetry (TSA), is expected to have opposite sign in DY and SIDIS. In 2015 COMPASS measured for the first time the Drell-Yan reaction pi- p↑ → mu- mu X to test this prediction and the results have been recently published. The main topic of the thesis is the first measurement of the TSAs weighted with the dimuon transverse momentum in this data. These asymmetries complement the conventional TSAs and their advantage is that they do not contain convolutions over intrinsic transverse momenta. My analysis work is described in detail and the results are compared with calculations based on the extraction of the Sivers function from the recently measured weighted Sivers asymmetry in SIDIS. The thesis also contains a theoretical introduction, the description of the apparatus focused on the polarised target and its monitoring system to which I contributed. Finally, a chapter dedicated to the first original analysis in my PhD, the measurement of a Sivers-like asymmetry in the J/psit production in SIDIS, which is related to the gluon Sivers function, is included as well.
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Matoušek, Jan. "Studium spinové struktury nukleonu s pomocí procesu Drell-Yan v experimentu Compass." Doctoral thesis, 2018. http://www.nusl.cz/ntk/nusl-375105.
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Jointly-supervised doctoral thesis Title: Nucleon spin structure studies in Drell-Yan process at COMPASS Author: Jan Matoušek Department I: Department of Low Temperature Physics, Faculty of Mathem- atics and Physics, Charles University Department II: Department of Physics, University of Trieste Supervisor I: prof. Miroslav Finger (Department I) Supervisor II: prof. Anna Martin (Department II) Abstract: The nucleon structure is presently described by Transverse Momentum Depend- ent (TMD) Parton Distribution Functions (PDFs), which generalise the collinear PDFs, adding partonic spin and transverse momentum degrees of freedom. The recent HERMES and COMPASS data on hadron production in deep inelastic scattering (SIDIS) of leptons off transversely polarised nucleons have provided a decisive validation of this framework. Nevertheless, the TMD PDFs should be studied in complementary reactions, like pp hard scattering and Drell-Yan pro- cesses. In particular the Sivers TMD PDF, which encodes the correlation between the nucleon transverse spin and quark transverse momentum and appears in the Sivers Transverse Spin Asymmetry (TSA), is expected to have opposite sign in Drell-Yan and SIDIS. In 2015 COMPASS measured for the first time the Drell- Yan process on a transversely polarised target π− p↑ → µ− µ+ X to test...
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Pešek, Michael. "Pionem indukovaný polarizovaný Drell-Yan proces v experimentu COMPASS." Doctoral thesis, 2020. http://www.nusl.cz/ntk/nusl-411965.
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In this work we present the basic theoretical concepts of the description of the nucleon spin structure. The theoretical background of two processes of interest - Semi-inclusive DIS and Drell-Yan - in the terms of Transverse Momentum De- pendent Parton distribution Functions is presented. The COMPASS experiment and particularly its unique polarised target are described in detail. Several target related measurements are presented. The express analysis and detector efficien- cies analysis are presented as examples of important hardware related analysis. Finally two measurements of Transverse Spin Asymmetries are presented. The first measurement is the measurement of the Transverse Spin Asymmetries in J/ψ production in the Semi-inclusive DIS on polarised protons. The second mea- surement is the measurement of Transverse Spin Asymmetries in J/ψ in the π− p polarised Drell-Yan data. 1
Book chapters on the topic "J/psi COMPASS"
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Samsonovich Alexei V. "Toward a Unified Catalog of Implemented Cognitive Architectures." In Frontiers in Artificial Intelligence and Applications. IOS Press, 2010. https://doi.org/10.3233/978-1-60750-661-4-195.
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This work is a review of the online Comparative Table of Cognitive Architectures (the version that was available at http://bicasymposium.com/cogarch on September 20, 2010). This continuously updated online resource is a collective product of many researchers and developers of cognitive architectures. Names of its contributors (sorted alphabetically by the represented architecture name) are: James S. Albus (4D/RCS), Christian Lebiere and Andrea Stocco (ACT-R), Stephen Grossberg (ART), Brandon Rohrer (BECCA), Balakrishnan Chandrasekaran and Unmesh Kurup (biSoar), Raul Arrabales (CERA-CRANIUM), Fernand Gobet and Peter Lane (CHREST), Ron Sun (CLARION), Ben Goertzel (CogPrime), Frank Ritter and Rick Evertsz (CoJACK), George Tecuci (Disciple), Shane Mueller (EPIC), Susan L. Epstein (FORR), Stuart C. Shapiro (GLAIR), Alexei Samsonovich (GMU BICA), Jeff Hawkins (HTM), David C. Noelle (Leabra), Stan Franklin (LIDA), Pei Wang (NARS), Akshay Vashist and Shoshana Loeb (Nexting), Cyril Brom (Pogamut), Nick Cassimatis (Polyscheme), L. Andrew Coward (Recommendation Architecture), Ashok Goel, J. William Murdock and Spencer Rugaber (REM), John Laird (Soar), and Kristinn Th&oacute;risson (Ymir). All these contributions are summarized in this work in a form that makes the described architectures easy to compare against each other.
Conference papers on the topic "J/psi COMPASS"
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Mann, Michael D. "Fatigue Life of Commercial High Pressure Tubing." In ASME 2002 Pressure Vessels and Piping Conference. ASMEDC, 2002. http://dx.doi.org/10.1115/pvp2002-1163.
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Design guidance for high pressure components, has undergone a dramatic change with the release of ASME Section VIII division 3 pressure vessel code. For the first time, a thorough design criteria is available for design of thick wall pressure vessels. The most critical components of a design are safety and reliability. Ultra high-pressure vessels, in most cases, do not have an “infinite” life. The design must therefore be “leak before break” and a design cycle life must be specified. This paper looks at the effects of fatigue on commercial high-pressure tubing under tri-axial fatigue. The tubing investigated is 316 stainless steel 9/16″ and 3/8″ diameter 4100 bar (60,000 psi) tubing. The testing was performed using a tri-axial fatigue machine originally designed by Dr. B. Crossland, Dr. J. L. M. Morrison and Dr. J. S. C. Perry in 1960 and upgraded by the Author. This investigation compares the fatigue life prediction per KD3 in the ASME pressure vessel code Section VIII division 3 and actual test results from the fatigue machine. This verification gives important reliability data for commercial hardware used in high-pressure piping.
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Árva, Zsolt, Ani Barbulova, Immacolata Fiume, Maneea Moubarak, and Gabriella Pocsfalvi. "A Multiplex GC-MS/MS Analysis for the Quantitative Moni-toring of Bilobalide, Ginkgolides and Ginkgotoxin in Ginkgo biloba-Derived Products and Biomaterials." In Socratic lectures 10. University of Lubljana Press, 2024. http://dx.doi.org/10.55295/psl.2024.i14.
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Abstract: The bioactivity Ginkgo biloba-derived extracts and other preparations is attributed to the presence of secondary metabolites, especially terpene trilactones (ginkgolides and bilobalide), flavonoids but also toxic constituents, like ginkgotoxin. In this study, we set up a multiplex method using a gas chromatography coupled with tandem mass spec-trometry (GC-MS/MS) for the simultaneous quantitative analysis of six of these char-acteristic metabolites, namely ginkgolide A, B, C, J, bilobalide and ginkgotoxin. Param-eters were set up and optimized for multiple reaction monitoring (MRM) to allow the sensitive and selective monitoring of specific collision induced dissociation transitions for each analyte. The method was applied to quantify and compare the above ingredi-ents after derivatization in the methanol extracts of a commercial supplement, ginkgo nuts, ginkgo cells from suspension and callus cultures, and microvesicles (MVs) and nanovesicles (NVs) isolated from ginkgo seeds. As a result of the MRM analysis, the commercial supplement contained 7,77% terpene lactones per tablet. The seed samples contained 50 parts per million (ppm) ginkgolide A and 14 ppm ginkgolide B, but gink-golide C and J were below the limit of quantitation. Ginkgo biloba cells from in vitro cultures, MVs and NVs contained considerably less bilobalide and ginkgolides than the seed and the commercial supplement. Keywords: Ginkgo biloba; extracellular vesicles; GC-MS/MS; derivatization; quantita-tive analysis, multiple reaction monitoring, ginkgolides, bilobalides, ginkgotoxin
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Feiz, Homayoon, Hasan Karim, Wei Zhao, et al. "Numerical Modelling of Combustion of Multiple Liquid Jet In Non-Uniform Crossflow." In ASME Turbo Expo 2023: Turbomachinery Technical Conference and Exposition. American Society of Mechanical Engineers, 2023. http://dx.doi.org/10.1115/gt2023-104092.
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Abstract The previous studies by the authors [1–2] focused on understanding the breakup mechanism of single or multiple liquid jets in non-uniform crossflows. Two different numerical approaches were taken; namely, the low-fidelity extended Madabhushi model and the high-fidelity VOF-DPM multiscale approach. These found that the high-fidelity approach, even without any fine-tuning, could predict the breakup mechanism and spray characteristics. Also, it was possible to fine-tune the parameters of the extended Madabhushi model based on experimental measurements or high-fidelity VOF-DPM results, whichever is more readily available. The present study is a continuation of the previous work where the applicability of the two spray generation approaches is used inside a combusting chamber where the crossflow is considerably hotter, causing the spray to evaporate and burn. Various unsteady LES simulations are performed with pure diesel and water-diesel mixture and injected in a heated nonuniform crossflow of 350°C inside a chamber at a pressure of 50 psi with a Momentum ratio (J) of ∼1.5. Due to experimental challenges, the momentum ratio was lowered (from the original planned J of 7.5) to have a stable flame and prevent blowout. As a result, the flame is near the bottom wall. This does create a modeling challenge to account for the heat loss effects. Due to the lack of droplet data such as Sauter mean diameter, volume flux, etc. for this combusting case, the authors rely on the comparison made by Feiz et al. [2]. Like previous studies by the authors, a modified version of the Madabhushi model proposed by Lambert et al. [25] is used here to simulate the jet breakup in a reacting flow simulation to get the spray regime. Alternatively, the authors have also generated the initial droplet data by running a VOF-DPM multiscale simulation with the LES turbulence model and explicit VOF for interface tracking. All the model parameters, whether those associated with turbulence modeling or with multiphase VOF modeling were retained at default values. Subsequently, reacting simulations using the single-step global mechanism of Kerosene (using C12H23 as a surrogate) for pure fuel injection (dry) and fuel+water injection (wet) are performed. Turbulence chemistry interaction is modeled using Eddy-Dissipation Model to calculate the flame shape and combustion products. Model tuning has been conducted using the University of Cincinnati Research data specifically designed for this configuration in partnership with General Electric Company. The Smagorinsky subgrid scale model with Wall adapting local eddy viscosity (WALE) near wall model is used for LES. The droplets are tracked using Ansys Fluent Discrete Particle Model (DPM). In this effort, the flame shape and extent of the flame near the wall have been captured and compared to experiments. Overall, the liquid penetration and flame shape are within reasonable accuracy.