Shape Optimization of Flow Guide in Three-dimensional Profile of an H-section Extrusion

Lee, S. R.; Yang, Ding

doi:10.1063/1.1766842

Cited by 7 publications

(10 citation statements)

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“…Our result for the nuclear matter can be a testing ground of this idea. The maximally expected mass shift around 15 MeV may not be large, but enough to be observable in the anti-proton project at FAIR [35]. This will be another challenge for future experiments.…”

Section: Summary and Discussionmentioning

confidence: 96%

In-medium modification ofP-wave charmonia from QCD sum rules

2009

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We investigate the changes of the masses and widths of χ c0 and χ c1 in hot gluonic matter near T c and in a nuclear medium using QCD sum rules. As in the previous works for the J /ψ and η c , in-medium effects are incorporated through the changes of gluon condensates. Twist-2 terms for the 3 P 0 (χ c0 ) and 3 P 1 (χ c1 ) are also included for the first time. The results show that larger mass shifts and width broadenings take place as compared to the S-wave states. As the critical change take place near T c , related measurements can reveal critical phenomenon in QCD.

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Section: Summary and Discussionmentioning

confidence: 96%

In-medium modification ofP-wave charmonia from QCD sum rules

2009

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“…They showed that the designed die with multi-step pockets can reduce extrusion pressure and distribute the flow more evenly. Lee et al [24] studied the optimal pockets' geometry of solid die for H-shaped aluminum profiles. The entrance geometry of the cavity was described by a B-spline curve, in which the control points of the curve were modified to achieve optimal geometry with the least deviation of velocity.…”

Section: Die Designmentioning

confidence: 99%

Effects of Solid Die Types in Complex and Large-Scale Aluminum Profile Extrusion

Truong

Hsu²,

Tong

2019

Applied Sciences

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Increasing customer requirements for quality and productivity in extruding aluminum products has led to the development of different types of extrusion dies. In this study, three different types of dies, including traditional flat die, pocket die and spread die were designed to extrude complex and large-scale solid profiles. The design parameters for these dies were used from actual extrusion experience. The results obtained from steady-state simulation such as velocity, temperature, extrusion force, and die deformation were used to assess the advantages and disadvantages of the dies. Transient simulations were performed to analyze the evolution of transverse weld in the pocket and spread dies. The effects of ram speeds on the related extrusion parameters were also investigated. The research results provide useful guides for designers and engineers in selecting these types of extrusion dies. parameters of extrusion process can be obtained such as extrusion velocity, product temperature, die deformation, die stress, welding seam etc. [10][11][12]. studied. To balance the metal flow in the extrusion product, the dies were designed with a 3D model using practical experience parameters. After that, numerical simulations of extrusion were conducted by HyperXtrude 2017 software (Altair Engineering, Inc., Michigan, USA) with the Arbitrary Lagrangian-Eulerian (ALE) algorithm. The steady-state extrusion parameters, such as extrusion force, velocity, temperature, and die deformation, were investigated. The transient simulation is utilized to explore the evolution of transverse weld in the billet-to-billet extrusion process of the pocket, and the spread dies. Finally, the effects of ram speeds on the related extrusion parameters were examined. The advantages and drawbacks of these die types are analyzed and evaluated based on the obtained parameters from simulations.

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“…While the masses of hadrons consisting of light quarks changes mainly because of the (partial) restoration of chiral symmetry those made of heavy quarks are sensitive mainly to the changes of the non-perturbative gluon dynamics manifested through the changes in the gluon condensates [5]. In the low density approximation the gluon condensate is expected to be reduced by 5 − 7% at normal nuclear density [6,7]. Therefore, the masses of the charmonium states -which can be considered as color dipoles in color electric field -are shifted downwards because of the second order Stark effect [7,8].…”

Section: Introductionmentioning

confidence: 99%

“…In the low density approximation the gluon condensate is expected to be reduced by 5 − 7% at normal nuclear density [6,7]. Therefore, the masses of the charmonium states -which can be considered as color dipoles in color electric field -are shifted downwards because of the second order Stark effect [7,8]. Moreover, since the D meson loops contribute to the charmonium self -energies and they are slightly modified in -medium, these modifications generate further minor contributions to the charmonium in -medium mass shifts [8].…”

Section: Introductionmentioning

confidence: 99%

Observation of Charmonium Mass Modification in Proton Induced Reactions

Wolf

Balassa

Kovács

et al. 2019

Proceedings of the 8th International Conference on Quarks and Nuclear Physics (QNP2018)

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We study the excitation function of the low-lying charmonium state: Ψ(3686) in p Au collisions taking into account their in-medium propagation. The time evolution of the spectral functions of the charmonium state is studied with a BUU type transport model. We calculated the charmonium contribution to the dilepton spectrum and show that for Ψ(3686) production there is a good chance to observe its in-medium modification with good resolution detectors. The energy regime will be available in JPARC.

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Shape Optimization of Flow Guide in Three-dimensional Profile of an H-section Extrusion

Cited by 7 publications

References 0 publications

In-medium modification ofP-wave charmonia from QCD sum rules

In-medium modification ofP-wave charmonia from QCD sum rules

Effects of Solid Die Types in Complex and Large-Scale Aluminum Profile Extrusion

Observation of Charmonium Mass Modification in Proton Induced Reactions

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