Multi-Objective Optimization of VBHF in Deep Drawing Based on the Improved QO-Jaya Algorithm

Blank holder force(BHF)is a crucial parameter in deep drawing,having close relation with the forming quality of sheet metal.However,there are different BHFs maintaining the best forming effect in different stages of deep drawing.The variable blank holder force(VBHF)varying with the drawing stage can overcome this problem at an extent.The optimization of VBHF is to determine the optimal BHF in every deep drawing stage.In this paper,a new heuristic optimization algorithm named Jaya is introduced to solve the optimization efficiently.An improved“Quasi-oppositional”strategy is added to Jaya algorithm for improving population diversity.Meanwhile,an innovated stop criterion is added for better convergence.Firstly,the quality evaluation criteria for wrinkling and tearing are built.Secondly,the Kriging models are developed to approximate and quantify the relation between VBHF and forming defects under random sampling.Finally,the optimization models are established and solved by the improved QO-Jaya algorithm.A VBHF optimization example of component with complicated shape and thin wall is studied to prove the effectiveness of the improved Jaya algorithm.The optimization results are compared with that obtained by other algorithms based on the TOPSIS method.

基于TLBO算法的不确定性条件下复杂产品协同设计的可靠性拓扑优化

复杂产品的拓扑优化设计可以显著节省材料和节能,有效地降低惯性力和机械振动。本研究以一种大吨位液压机作为典型的复杂产品,用于阐述该优化方法。本文提出了一种基于可靠性与优化解耦模型和基于教学学习的优化(TLBO)算法的可靠性拓扑优化方法。将由板结构形成的支撑物作为拓扑优化对象,重量轻、稳定性好。将不确定性下的可靠性优化和结构拓扑优化协同处理。首先,利用有限差分法将优化问题中的不确定性参数修正为确定性参数。然后,将不确定性可靠性分析和拓扑优化的复杂嵌套解耦。最后,利用TLBO算法求解解耦模型,该算法参数少,求解速度快。TLBO算法采用了自适应教学因子,在初始阶段实现了更快的收敛速度,并在后期进行了更精细的搜索。本文给出了一个液压机基板结构的数值实例,说明了该方法的有效性。

Form factor for Dalitz decays from J/ψto light pseudoscalars

We calculate the form factor M(q^(2))for the Dalitz decay J/ψ→γ*(q^(2))η(N_(f)=1)with η(N_(f))being the SU(N_(f))flavor singlet pseudoscalar meson.The difference among the partial widths Г(J/ψ→γη(N_(f)))at different N_(f) can be attributed in part to the N_(f) and quark mass dependences induced by the U_(A)(1)anomaly dominance.M(q^(2))in both N_(f)=1,2 is well described by the single pole model M(q^(2))=M(0)/(1-q^(2)/Λ^(2)).Combined with the known experimental results of the Dalitz decays J/ψ-Pe^(+)e^(−),the pseudoscalar mass mp dependence of the pole parameter A is approximated byΛ(m^(2)_(p))=Λ_(1)(1-m^(2)_(p)/Λ_(2))withΛ_(1)=2.65(5)GeV andΛ_(2)=2.90(35)GeV.These results provide inputs for future theoretical and experimental studies on the Dalitz decays J/ψ→Pe^(+)e^(−).

The radiative decay of scalar glueball from lattice QCD

We perform the first lattice QCD study on the radiative decay of the scalar glueball to the vector mesonφin the quenched approximation.The calculations are carried out on three gauge ensembles with different lattice spacings,which enable us to do the continuum extrapolation.We first revisit the radiative J/ψdecay into the scalar glueball G and obtain the partial decay widthΓ(J/ψ→γG)=0.578(86)keV and the branching fraction Br(J/ψ→γG)=6.2(9)×10^(-3),which are in agreement with the previous lattice results.We then extend the similar calculation to the process G→γφand get the partial decay widthΓ(G→γφ)=0.074(47)keV,which implies that the combined branching fraction of J/ψ→γG→γγφis as small as O(10^(-9))such that this process is hardly detected by the BESⅢexperiment even with the large J/ψsample of O(10^(10)).With the vector meson dominance model,the two-photon decay width of the scalar glueball is estimated to beΓ(G→γγ)=0.53(46)e V,which results in a large stickiness S(G)~O(10^(4))of the scalar glueball by assuming the stickiness of f_(2)(1270)to be one.

Glueballs at physical pion mass

Glueballs are investigated through gluonic operators on two N_(f)=2+1RBC/UKQCD gauge ensembles at the physical pion mass.The statistical errors of glueball correlation functions are considerably reduced through the cluster decomposition error reduction(CDER)method.The Bethe-Salpeter wave functions are obtained for the scalar,tensor,and pseudoscalar glueballs by using spatially extended glueball operators defined through the gauge potential A_(μ)(x)in the Coulomb gauge.These wave functions exhibit similar features of non-relativistic two-gluon systems and are used to optimize the signals of the related correlation functions at the early time regions,where the ground state masses are extracted.These masses are close to those from the quenched approximation and indicate the possible existence of glueballs at the physical point.The resonance feature of glueballs and the mixing with conventional mesons and multi-hadron systems should be considered in a more systematic lattice study.

Annihilation diagram contribution to charmonium masses

In this work,we generate gauge configurations with N_(f)=2 dynamical charm quarks on anisotropic lattices.The mass shift of 1S and 1P charmonia due to the charm quark annihilation effect can be investigated directly in a manner of unitary theory.The distillation method is adopted to treat the charm quark annihilation diagrams at a very precise level.For 1S charmonia,the charm quark annihilation effect barely changes the J/ψmass,but lifts theη_(c) mass by approximately 3-4 MeV.For 1P charmonia,this effect results in positive mass shifts of approximately 1 MeV for χ_(c)1 and h_(c),but decreases the χ_(c)2 mass by approximately 3 MeV.We did not obtain a reliable result for the mass shift of χ_(c)0.In addition,we observed that the spin averaged mass of the spin-triplet 1P charmonia is in good agreement with h_(c),as expected by the non-relativistic quark model and measured by experiments.

A Meta-analysis of Cross-linguistic Syntactic Priming Effects

Cross-linguistic syntactic priming(C LSP)refers to the phenomenon that the use of aparticular structure(e.g.,p assives)in one language facilitates orprimes the subsequent use of the parallel structure in the other language of abilingual speaker.Individual studies examining CLSP effects have produced conflicting results.This study aims to estimate the population effects of cross-ling uistic syntactic priming effects and lexical boost effect,and to examine how potential moderators(priming direction,L2learnersproficiency levels,and structural similarities)influenced crosslinguistic priming,electronic research databases were searched sy stematically for published studies,which measured CLSP effects.Meta-analytic techniques were used to analyze 20L1 to L2cross-linguistic studies with 32 effects sizes and 10L2 to L1studies with 19 effect sizes.Most studies involved 20-45 minutes of priming activities.Hetero geneity exists within the crosslinguistic priming but the priming direction(L1to L2 or L2to L1),L2learnersproficiency levels,experimental modes and structural similarities were not potential moderators.For the L1 to L2studies,the results turned out to be homogeneous.For the L2 to L1direction,though the results were heterog eneous,L2learnersproficiency level,experimental modes,and structural similarities were not moderators.More detailed information should be given for the cross-linguistic priming studies and more refined meta-analy sis containing more p otential moderators should be carried out in the future.

One-Dimensional Arrays of Sensing Materials Based on Wettability Interface Dewetting Process

CONSPECTUS:With the rapid development of artificial intelligence technology,the demand for various sensors used to perceive the external environment and obtain signals that can be processed by the intelligent core has greatly increased.These sensors include chemical sensors used to imitate human smell and taste,orientation sensors,and light sensors,etc.The challenge that these sensors generally face is a sensitivity problem,given its stringent requirements of miniaturization,arraying,and diversification.The existing sensing materials used to prepare sensors are mainly focused on the most traditional large-area film laying or electrospinning techniques.However,these methods experience difficulty in miniaturization and regular arraying,and sensitivity cannot be guaranteed.Therefore,a new type of technology is much needed to realize the one-dimensional regular array of sensing materials so as to prepare small and accurate sensors.As for the research on the principle of wettability,the precise control of the solid−liquid−gas three-phase contact line provides a possible way for the one-dimensional arrays of sensing materials.Through the control of the three-phase line,the sensing material can be crystallized,aggregated,or accumulated at a precise position to realize one-dimensional arrays.At the same time,due to the comprehensive adjustability of the interface wettability,this method has strong universality and enables preparation of onedimensional array sensors for many types of sensing materials.In this Account,the authors first summarized the overall research progress in the use of different wettability-controlled interfaces for material one-dimensionalization.Then,the precise dewetting control of the gas−liquid−solid three-phase contact line of three different wettability interfaces is described in detail,and the process of using different shapes,different textures,and different wettability templates to realize sensing materials into one-dimensional is introduced.In the control process,distinctive types of materials are used,ranging from inorganic materials to organic small molecule materials to polymer materials.The applications of these sensors mainly focus on chemical sensing,magnetic field orientation sensing,and photoelectric conversion sensing fields.All these one-dimensional arrayed sensors have the advantages of miniaturization,arraying,and high sensitivity.The combination of molecular structural design of the sensing material and the one-dimensional array of devices greatly improves the sensitivity of the sensor.Finally,we conclude this Account with a perspective on one-dimensional,high-sensitivity,miniaturized arrayed array sensors prepared on the basis of the regulation of different wettability interfaces.