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High-temperature oxidation behavior of polymer-derived SiHfBCN ceramic nanocomposites
Yuan, J.,Galetz, M.,Luan, X.G.,Fasel, C.,Riedel, R.,Ionescu, E. Elsevier Science Publishers 2016 Journal of the European Ceramic Society Vol.36 No.12
Within this study, the oxidation behavior of SiHfBCN ceramic powders and monoliths was studied at temperatures from 1200 to 1400<SUP>o</SUP>C. Both powder and monolithic samples exhibited parabolic oxidation behavior characterized by very low rates (10<SUP>-9</SUP>-10<SUP>-8</SUP>mg<SUP>2</SUP>cm<SUP>-4</SUP>h<SUP>-1</SUP>). The activation energy of 112.9kJmol<SUP>-1</SUP>, which was determined for the SiHfBCN powder, is comparable to that of other silica formers such as silicon or SiC and relates to the diffusion of molecular oxygen through silica scale. Whereas, the values determined for the SiHfBCN ceramic monoliths (174 and 140kJmol<SUP>-1</SUP>, depending on the Hf content) indicate the complex nature of their oxidation process, leading at temperatures below 1300<SUP>o</SUP>C to a continuous oxide scale consisting of borosilicate, silica, m-and t-HfO<SUB>2</SUB>. At higher temperatures, the oxide scale consists of silica, HfSiO<SUB>4</SUB> as well as m-and t-HfO<SUB>2</SUB> and becomes discontinuous, probably due to the evaporation of boria.
Measurement ofe+e−→π+π−ψ(2S)via initial state radiation at Belle
Wang, X. L.,Yuan, C. Z.,Shen, C. P.,Wang, P.,Abdesselam, A.,Adachi, I.,Aihara, H.,Al Said, S.,Arinstein, K.,Asner, D. M.,Ayad, R.,Bakich, A. M.,Bansal, V.,Bhuyan, B.,Bobrov, A.,Bonvicini, G.,Brax10d American Physical Society 2015 PHYSICAL REVIEW D - Vol.91 No.11
Search forXYZstates inϒ(1S)inclusive decays
Shen, C. P.,Yuan, C. Z.,Ban, Y.,Aihara, H.,Asner, D. M.,Badhrees, I.,Bakich, A. M.,Barberio, E.,Behera, P.,Bhardwaj, V.,Bhuyan, B.,Biswal, J.,Bondar, A.,Bonvicini, G.,Bozek, A.,Brax10d,ko, M.,Browde American Physical Society 2016 Physical Review D Vol.93 No.11
<P>The branching fractions of the Upsilon(1S) inclusive decays into final states with a J/psi or psi(2S) are measured with improved precision to be B Upsilon(1S) -> J/psi + anything = (5.25 +/- 0.13(stat) +/- 0.25(syst) x 10(-4) and B Upsilon(1S) -> psi(2S) + anything = (1.23 +/- 0.17(stat) +/- 0.11(syst)) x 10(-4). The first search for Upsilon(1S) decays into XYZ states that decay into a J/psi or a psi(2S) plus one or two charged tracks yields no significant signals for XYZ states in any of the examined decay modes, and upper limits on their production rates in Upsilon(1S) inclusive decays are determined.</P>
Updated cross section measurement ofe+e−→K+K−J/ψandKS0KS0J/ψvia initial state radiation at Belle
Shen, C. P.,Yuan, C. Z.,Wang, P.,Abdesselam, A.,Adachi, I.,Aihara, H.,Al Said, S.,Asner, D. M.,Aulchenko, V.,Aushev, T.,Ayad, R.,Bakich, A. M.,Bala, A.,Bobrov, A.,Bonvicini, G.,Bozek, A.,Brax10d,ko, American Physical Society 2014 PHYSICAL REVIEW D - Vol.89 No.7
Spectral tomographic analysis of Bremsstrahlung X-rays generated in a laser-produced plasma
Rhee, Y.J.,Nam, S.M.,Peebles, J.,Sawada, H.,Wei, M.,Vaisseau, X.,Sasaki, T.,Giuffrida, L.,Hulin, S.,Vauzour, B.,Santos, J.J.,Batani, D.,McLean, H.S.,Patel, P.K.,Li, Y.T.,Yuan, D.W.,Zhang, K.,Zhong, J. Cambridge University Press 2016 Laser and particle beams Vol.34 No.4
<B>Abstract</B><P>A new approach is proposed to analyze Bremsstrahlung X-rays that are emitted from laser-produced plasmas (LPP) and are measured by a stack type spectrometer. This new method is based on a spectral tomographic reconstruction concept with the variational principle for optimization, without referring to the electron energy distribution of a plasma. This approach is applied to the analysis of some experimental data obtained at a few major laser facilities to demonstrate the applicability of the method. Slope temperatures of X-rays from LPP are determined with a two-temperature model, showing different spectral characteristics of X-rays depending on laser properties used in the experiments.</P>
Functional cortical neurons and astrocytes from human pluripotent stem cells in 3D culture
Pax15f,ca, Anca M,Sloan, Steven A,Clarke, Laura E,Tian, Yuan,Makinson, Christopher D,Huber, Nina,Kim, Chul Hoon,Park, Jin-Young,O'Rourke, Nancy A,Nguyen, Khoa D,Smith, Stephen J,Huguenard, John R,Ge Nature Publishing Group 2015 NATURE METHODS Vol. No.
The human cerebral cortex develops through an elaborate succession of cellular events that, when disrupted, can lead to neuropsychiatric disease. The ability to reprogram somatic cells into pluripotent cells that can be differentiated in vitro provides a unique opportunity to study normal and abnormal corticogenesis. Here, we present a simple and reproducible 3D culture approach for generating a laminated cerebral cortex–like structure, named human cortical spheroids (hCSs), from pluripotent stem cells. hCSs contain neurons from both deep and superficial cortical layers and map transcriptionally to in vivo fetal development. These neurons are electrophysiologically mature, display spontaneous activity, are surrounded by nonreactive astrocytes and form functional synapses. Experiments in acute hCS slices demonstrate that cortical neurons participate in network activity and produce complex synaptic events. These 3D cultures should allow a detailed interrogation of human cortical development, function and disease, and may prove a versatile platform for generating other neuronal and glial subtypes in vitro.
S. D. Liu,Y.B.Yuan,C. B. Li,J. H. You,X. M. Zhang 대한금속·재료학회 2012 METALS AND MATERIALS International Vol.18 No.4
The influence of cooling rate (0.009-220 °C/s) after homogenization on the microstructure and mechanical properties of high strength aluminum alloy 7050 was investigated by tensile testing, optical microscope,X-ray diffraction, scanning electron microscope, and transmission electron microscope. A lower cooling rate after homogenization resulted in lower mechanical properties after aging. The drop in strength was significant when the cooling rate was decreased from 0.5 °C/s to 0.1 °C/s. A lower cooling rate gave rise to a larger amount of remnant S(Al2CuMg) phase and a higher fraction of recrystallization after solution heat treatment. Consequently, the increase in strength after aging due to precipitation hardening and substructure hardening was less significant in the case of slow cooling. This was supposed to be responsible for the lower mechanical properties due to a lower cooling rate after homogenization.
On snap-buckling of FG-CNTR curved nanobeams considering surface effects
Yuan Yuan Zhang,Yu X. Wang,Xin Zhang,Huo M. Shen,Gui-Lin She 국제구조공학회 2021 Steel and Composite Structures, An International J Vol.38 No.3
The aim of this paper is to analyze the nonlinear bending of functionally graded (FG) curved nanobeams reinforced by carbon nanotubes (CNTs) in thermal environment. Chen-Yao’s surface elastic theory and geometric nonlinearity are also considered. The nanobeams are subjected to uniform loadings and placed on three-parameter substrates. The Euler-Lagrange equations are employed to deduce the equations of equilibrium. Then, the asymptotic solutions and boundary value problems are analytically determined by utilizing the two-step perturbation technique. Finally, the effects of the surface parameters, geometric factors, foundation stiffness, volume fraction, thermal effects and layout type of CNTs on the nonlinear bending of the nanobeams are discussed.
Q. Ma,M. Yue,W. C. Lv,H. G. Zhang,X. K. Yuan,D. T. Zhang,X. F. Zhang,J. X. Zhang,X. X. Gao 한국자기학회 2016 Journal of Magnetics Vol.21 No.1
In the present study, bulk anisotropic nanocrystalline SmCo₅ magnets were prepared by hot deformation. The effect of deformation temperature on the texture and magnetic properties are presented, based on which the mechanism of plastic deformation and texture formation during the hot deformation process is discussed. Our analyses reveal that deformation temperature is one of the most important parameters that determine the texture of SmCo5 grains. We suggest that diffusion creep plastic deformation occurs during hot deformation, which is very sensitive to the energy gain provided by an increase in temperature.
Observation of e+e−→γχc1 and search for e+e−→γχc0 , γχc2 , and γηc at s near 10.6 GeV at Belle
Jia, S.,Wang, X. L.,Shen, C. P.,Yuan, C. Z.,Adachi, I.,Aihara, H.,Al Said, S.,Asner, D. M.,Atmacan, H.,Aulchenko, V.,Aushev, T.,Ayad, R.,Babu, V.,Bansal, V.,Behera, P.,Beleñ,o, C.,Berger, M.,Bhu American Physical Society 2018 Physical Review D Vol.98 No.9