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81 results on '"Zhao, Yan-Qing"'

1. Holographic spin alignment for vector mesons

Author

Sheng, Xin-Li, Zhao, Yan-Qing, Li, Si-Wen, Becattini, Francesco, and Hou, Defu

Subjects
High Energy Physics - Phenomenology, High Energy Physics - Theory, Nuclear Theory
Abstract

We develop a general framework for studying the spin alignment $\rho_{00}$ for flavorless vector mesons by using the gauge/gravity duality. Focusing on the dilepton production through vector meson decay, we derive the relation between production rates at each spin channel and meson's spectral function, which can be evaluated by holographic models for a strongly coupled system. As examples, we study $\rho_{00}$ for $J/\psi$ and $\phi$ mesons, induced by the relative motion to a thermal background, within the soft-wall model. We show that $\rho_{00}$ in the helicity frame for $J/\psi$ and $\phi$ mesons have positive and negative deviations from 1/3 at $T=150$ MeV, respectively, which consequently leads to different properties for their global spin alignments., Comment: 10 pages, 7 figures

Published
2024

2. Holographic spin alignment of $J/\psi$ meson in magnetized plasma

Author

Zhao, Yan-Qing, Sheng, Xin-Li, Li, Si-Wen, and Hou, Defu

Subjects
High Energy Physics - Phenomenology, High Energy Physics - Theory
Abstract

We study the mass spectra and spin alignment of vector meson $J/\psi$ in a thermal magnetized background using a generalized theoretical framework based on gauge/gravity duality. Utilizing a soft wall model for the QGP background and a massive vector field for the $J/\psi$ meson, we delve into the meson's spectral function and spin parameters $(\lambda_{\theta},\, \lambda_\varphi,\,\lambda_{\theta\varphi})$ for different cases, assessing their response to variations in magnetic field strength, momentum, and temperature. We initially examine scenarios where a meson's momentum aligns parallel to the magnetic field in helicity frame. Our results reveal a magnetic field-induced positive $\lambda_\theta^\text{H}$ for low meson momentum, transitioning to negative with increased momentum. As a comparison, we also study the case of momentum perpendicular to the magnetic field and find the direction of magnetic field does not affect the qualitative behavior for the $eB$-dependence of $\lambda_\theta^\text{H}$. Moreover, we apply our model to real heavy-ion collisions for three different spin quantization directions. Further comparisons with experimental data show qualitative agreement for spin parameters $\lambda_{\theta}$ and $\lambda_\varphi$ in the helicity and Collins-Soper frames., Comment: 27 pages, 8 figures

Published
2024

3. Phase structure and critical phenomena in 2-flavor QCD by holography

Author

Zhao, Yan-Qing, He, Song, Hou, Defu, Li, Li, and Li, Zhibin

Subjects
High Energy Physics - Phenomenology, High Energy Physics - Theory
Abstract

We explore the phase structure of Quantum Chromodynamics (QCD) with two dynamical quark flavors at finite temperature and baryon chemical potential, employing the non-perturbative gauge/gravity duality approach. Our gravitational model is tailored to align with state-of-the-art lattice data regarding the thermal properties of multi-flavor QCD. Following a rigorous parameter calibration to match equations of state and the QCD trace anomaly at zero chemical potential derived from cutting-edge lattice QCD simulations, we investigate thermodynamic quantities and order parameters. We predict the location of the critical endpoint (CEP) at $(\mu_{\text{CEP}}, T_{\text{CEP}})=(219,182)$ MeV at which a line of first-order phase transitions terminate. We compute critical exponents associated with the CEP and find that they almost coincide with the critical exponents of the quantum 3D Ising model., Comment: 20 pages, 12 figures

Published
2023
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5. $J/\Psi$ suppression in a rotating magnetized holographic QGP matter

Author

Zhao, Yan-Qing and Hou, Defu

Subjects
High Energy Physics - Phenomenology
Abstract

We study the dissociation effect of $J/\Psi$ in magnetized, rotating QGP matter at finite temperature and chemical potential using gauge/gravity duality. By incorporating angular velocity into the holographic magnetic catalysis model, we analyze the influence of temperature, chemical potential, magnetic field, and angular velocity on the properties of $J/\Psi$ meson. The results reveal that temperature, chemical potential, and rotation enhance the dissociation effect and increase the effective mass in the QGP phase. However, the magnetic field suppresses dissociation, and its effect on the effective mass is non-trivial. Additionally, we explore the interplay between magnetic field and rotation, identifying a critical angular velocity that determines the dominant effect. As a parallel study, we also examine the rotation effect in the holographic inverse magnetic catalysis model, although the magnetic field exhibits distinctly different behaviors in these two models, the impact of rotation on the dissociation effect of $J/\Psi$ is similar. Finally, we investigate the influence of electric field and demonstrate that it also speeds up the $J/\Psi$ dissociation., Comment: 24 pages, 13 figures

Published
2023

6. Configuration entropy of $\Upsilon(1S)$ state in strong coupling plasma

Author

Zhao, Yan-Qing and Hou, Defu

Subjects
High Energy Physics - Phenomenology
Abstract

To better understand the effects of strong coupling and QCD at high temperature in QGP, by using holographic model, we investigate the dissociation effect of bottomonium under the higher-order curvature corrections to the supergravity action corresponding to the corrections of large N expansion of boundary CFT in the side of field theory. The results show that effective potential is not a good physical quantity to estimate the dissociation strength of bottomonium in the case of finite wave number and considering the higher-order curvature corrections. Therefore, we calculate the quasinormal spectra(QNMs) and the differential configuration entropy(DCE). It is found that the dissociation effect is stronger for the stronger coupling., Comment: 8 pages, 8 figures

Published
2023
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7. Phase diagram of holographic thermal dense QCD matter with rotation

Author

Zhao, Yan-Qing, He, Song, Hou, Defu, Li, Li, and Li, Zhibin

Subjects
High Energy Physics - Phenomenology, High Energy Physics - Theory
Abstract

We study the rotation effects of the hot and dense QCD matter in a non-perturbative regime by the gauge/gravity duality. We use the gravitational model that is designated to match the state-of-the-art lattice data on the thermal properties of (2+1)-flavor QCD and predict the location of the critical endpoint and the first-order phase transition line at large baryon chemical potential without rotation. After introducing the angular velocity via a local Lorentz boost, we investigate the thermodynamic quantities for the system under rotation in a self-consistent way. We find that the critical temperature and baryon chemical potential associated with the QCD phase transition decrease as the angular velocity increases. Moreover, some interesting phenomena are observed near the critical endpoint. We then construct the 3-dimensional phase diagram of the QCD matter in terms of temperature, baryon chemical potential, and angular velocity. As a parallel investigation, we also consider the gravitational model of $SU(3)$ pure gluon system, for which the 2-dimensional phase diagram associated with temperature and angular velocity has been predicted. The corresponding thermodynamic quantities with rotation are investigated., Comment: 22 pages, 24 figures

Published
2022
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8. Vector meson spectral function in a dynamical AdS/QCD model

Author

Zhao, Yan-Qing and Hou, Defu

Subjects
High Energy Physics - Phenomenology
Abstract

By using gauge/gravity duality, we calculate the spectral function of the heavy vector mesons with the presence of an intense magnetic field in a hot and dense medium. The results show that, a general conclusion, as the increases of magnetic field, chemical potential and temperature, the height of the peak of the spectral function decreases and the width increases. A nontrivial result is the change from the peak position of spectral function. We explain this non-trivial behavior by the interplay of the interaction between the two heavy quarks and the interaction between the medium with each of the heavy quarks.

Published
2021
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10. Thermodynamics of heavy quarkonium in magnetic field background

Author

Zhou, Jing, Chen, Xun, Zhao, Yan-Qing, and Ping, Jialun

Subjects
High Energy Physics - Phenomenology
Abstract

We study the effect of magnetic field on heavy quark-antiquark pair in both Einstein-Maxwell(EM) and Einstein-Maxwell-Dilaton(EMD) model. The interquark distance, free energy, entropy, binding energy and internal energy of the heavy quarkonium are calculated. It is found that the free energy suppresses and the entropy increases quickly with the increase of the magnetic field $B$. The binding energy vanishes at smaller distance when increasing the magnetic field, which indicates the quark-antiquark pair dissociates at smaller distance. The internal energy which consists of free energy and entropy will increase at large separating distance for non-vanishing magnetic field. These conclusions are consistent both in the EM and EMD model. Moreover, we also find that the quarkonium will dissociate easier in the parallel direction than that in the transverse direction for EMD model, but the conclusion is opposite in EM model. Lattice results are in favor of EMD model. Besides, a Coulomb-plus-linear potential(Cornell potential) can be realized only in EMD model. Thus, a dilaton field is proved to be important in holographic model. Finally, we also show that the free energy, entropy and internal energy of a single quark in EMD model with the presence of magnetic field., Comment: 21 pages, 13 figures

Published
2020
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11. A systematically study of thermal width of heavy quarkonia in a finite temperature magnetized background from holography

Author

Feng, Sheng-Qin, Zhao, Yan-Qing, and Chen, Xun

Subjects
High Energy Physics - Phenomenology
Abstract

By simulating the finite temperatures magnetized background in the RHIC and LHC energies, we systematically study the characteristics of thermal widths and potentials of heavy quarkonia. It is found that the magnetic field has less influence on the real potential, but has a significant influence on the imaginary potential, especially in the low deconfined temperature. Extracted from the effect of thermal worldsheet fluctuations about the classical configuration, the thermal width of $\Upsilon(1s)$ in the finite temperature magnetized background is investigated. It is found that at the low deconfined temperature the magnetic field can generate a significant thermal fluctuation of the thermal width of $\Upsilon(1s)$, but with the increase of temperature, the effect of magnetic field on the thermal width becomes less important, which means the effect of high temperature completely exceeds that of magnetic field and magnetic field become less important at high temperature. The thermal width decreases with the increasing rapidity at the finite temperature magnetized background. It is also observed that the effect of the magnetic field on the thermal width when dipole moving parallel to the magnetic field direction are larger than that moving perpendicular to the magnetic field direction, which implies that the magnetic field tends to enhance thermal fluctuation when dipole moving parallel to the direction of magnetic field. The thermal width of $\Upsilon(1S)$ hardly changes with the increasing temperature when dipole moving perpendicular to the magnetic field. But when dipole moving parallel to the magnetic field, the thermal width at low temperature is obviously larger than that at high temperature., Comment: 20 pages,7 figures

Published
2019
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12. The effect of gluon condensate on imaginary potential and thermal width from holography

Author

Zhao, Yan-Qing, Zhu, Zhou-Run, and Chen, Xun

Subjects
High Energy Physics - Phenomenology
Abstract

By the use of the gauge/gravity duality, we calculate the imaginary part of heavy quarkonium potential and thermal width with the effect of gluon condensate which is absent in AdS$_{5}$ background. Our results show that the dropping gluon condensate reduces the absolute value of imaginary potential and therefore decreases the thermal width both in "exact" and "approximate" approach implying that the heavy quarkonium has a weaker bound with the increase of gluon condensate. In addition, the thermal width will disappear at a critical condensate value, which indicates the dissociation of quarkonium. We conclude that increasing gluon condensate will lead to easier dissociation of heavy quarkonium for fixed temperature., Comment: 6 pages, 6 figures

Published
2019
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22. CBM Collaboration

Author

Ablyazimov, T., primary, Adak, R.P., additional, Adler, A., additional, Agarwal, A., additional, Agarwal, K., additional, Ahammed, Z., additional, Ahmad, A., additional, Ahmad, F., additional, Ahmad, N., additional, Akindinov, A., additional, Akishin, P., additional, Akishina, V., additional, Al-Turany, M., additional, Alekseev, I., additional, Alexandrov, E., additional, Alexandrov, I., additional, Andronic, A., additional, Appelshäuser, H., additional, Argintaru, D., additional, Arnoldi-Meadows, B., additional, Atkin, E., additional, Azmi, M.D., additional, Baban, V., additional, Bähr, S., additional, Bajdel, M., additional, Balassa, G., additional, Balzer, M., additional, Baranova, N., additional, Bashir, S., additional, Baszczyk, M., additional, Bechtel, E., additional, Becker, J., additional, Becker, K.-H., additional, Becker, M., additional, Beckhoff, J., additional, Belogurov, S., additional, Belousov, A., additional, Bendarouach, J., additional, Bercuci, A., additional, Berendes, R., additional, Bertini, D., additional, Bertini, O., additional, Bezshyyko, O., additional, Bhaduri, P.P., additional, Bhasin, A., additional, Bhat, S.A., additional, Bhat, W.A., additional, Bhattacharjee, B., additional, Bhattacharyya, A., additional, Bhattacharyya, T.K., additional, Biswas, S., additional, Blank, T., additional, Blau, D., additional, Blume, C., additional, Brzychczyk, J., additional, Bus, T., additional, Bychkov, A., additional, Cãlin, M., additional, Caselle, M., additional, Chakrabarti, A., additional, Chatterjee, S., additional, Chattopadhyay, S., additional, Chaus, A., additional, Cherif, H., additional, Chudoba, P., additional, Clerkin, E., additional, Csanád, M., additional, Dahm, P., additional, Das, Supriya, additional, Susovan, Das, additional, de Cuveland, J., additional, Demanov, A., additional, Dementiev, D., additional, Deng, Wendi, additional, Deng, Zhi, additional, Deppe, H., additional, Deppner, I., additional, Derenovskaya, O., additional, Deveaux, M., additional, Ding, Zhiguo, additional, Dong, Sheng, additional, Dorenskaya, E., additional, Dorosz, P., additional, Dubey, A.K., additional, Dubla, A., additional, Dürr, M., additional, Elsha, V.V., additional, Emschermann, D., additional, Engel, H., additional, Eşanu, T., additional, Eschke, J., additional, Esen, M., additional, Fan, Xingming, additional, Fateev, O., additional, Feier-Riesen, C., additional, Feng, Sheng-Qin, additional, Fidorra, F., additional, Figuli, S.P.D., additional, Finogeev, D., additional, Fischer, P., additional, Flemming, H., additional, Förtsch, J., additional, Foka, P., additional, Frankenfeld, U., additional, Friese, V., additional, Friske, E., additional, Fröhlich, I., additional, Frühauf, J., additional, Galatyuk, T., additional, Ganai, R., additional, Gangopadhyay, G., additional, Gao, Xin, additional, Gasik, P., additional, Geßler, T., additional, Ghosh, C., additional, Ghosh, S.K., additional, Giang, D., additional, Gläßel, S., additional, Golinka-Bezshyyko, L., additional, Golosov, O., additional, Golovnya, S., additional, Golubeva, M., additional, Golubkov, D., additional, Gope, S., additional, Gorbunov, S., additional, Gorokhov, S., additional, Gottschalk, D., additional, Gryboś, P., additional, Guber, F., additional, Gumiński, M., additional, Gupta, A., additional, Gusakov, Yu., additional, Haas, R., additional, Han, Dong, additional, Hartmann, H., additional, He, Shu, additional, Hehner, J., additional, Heine, N., additional, Herrmann, N., additional, Heuser, J.M., additional, Höhne, C., additional, Holzmann, R., additional, Hu, Dongdong, additional, Huang, Guangming, additional, Huang, Xinjie, additional, Hutter, D., additional, Irfan, M., additional, Ivanishchev, D., additional, Ivanov, P., additional, Ivanov, Victor, additional, Ivanov, Vladimir, additional, Ivashkin, A., additional, Izvestnyy, A., additional, Jahan, H., additional, Janson, T., additional, Jash, A., additional, Jipa, A., additional, Kadenko, I., additional, Kähler, P., additional, Kämpfer, B., additional, Kampert, K.-H., additional, Kapell, R., additional, Karabowicz, R., additional, Kargin, N., additional, Karmanov, D., additional, Karpushkin, N., additional, Kashirin, E., additional, Kashyap, V.K.S., additional, Kasiński, K., additional, Kasprowicz, G., additional, Kazantsev, A., additional, Kebschull, U., additional, Kekelidze, G., additional, Khan, M.M., additional, Khan, S., additional, Khanzadeev, A., additional, Khasanov, F., additional, Kiryakov, A., additional, Kiš, M., additional, Kisel, I., additional, Kisel, P., additional, Kiselev, S., additional, Kiss, T., additional, Klaus, P., additional, Kłeczek, R., additional, Klein-Bösing, Ch., additional, Klochkov, V., additional, Kmon, P., additional, Koch, K., additional, Kochenda, L., additional, Koczoń, P., additional, Kohn, M., additional, Kolb, R., additional, Kolozhvari, A., additional, Komkov, B., additional, Korolev, M., additional, Korolko, I., additional, Kot, O., additional, Kotte, R., additional, Kovalchuk, O., additional, Koziel, M., additional, Kozlov, G., additional, Kozlov, V., additional, Kravtsov, P., additional, Kres, I., additional, Kresan, D., additional, Kruszewski, M., additional, Kryanev, A.V., additional, Kryshen, E., additional, Krzyżanowska, A., additional, Kucewicz, W., additional, Kudin, L., additional, Kudryashov, I., additional, Kugler, A., additional, Kuhl, P., additional, Kumar, Ajay, additional, Kumar, Ajit, additional, Kumar, L., additional, Kundu, S.K., additional, Kurepin, A., additional, Kurepin, N., additional, Kurilkin, P., additional, Kuznetsov, S., additional, Kyva, V., additional, Ladygin, V., additional, Lara, C., additional, Lavrik, E., additional, Lazanu, I., additional, Lebedev, A., additional, Lebedev, S., additional, Lebedeva, E., additional, Lehnert, J., additional, Leifels, Y., additional, Li, Chao, additional, Li, Yuanjing, additional, Lindenstruth, V., additional, Liu, Feng, additional, Lobanov, I., additional, Lobanova, E., additional, Löchner, S., additional, Loizeau, P.-A., additional, Łojek, K., additional, Lubynets, O., additional, Lucio Martínez, J.A., additional, Luo, Xiaofeng, additional, Lymanets, A., additional, Lyu, Pengfei, additional, Lyublev, N., additional, Ma, Jian-Hao, additional, Maevskaya, A., additional, Mahajan, S., additional, Maj, P., additional, Majka, Z., additional, Malakhov, A., additional, Malankin, E., additional, Malkevich, D., additional, Mallick, B., additional, Malyatina, O., additional, Mandal, M., additional, Manko, V., additional, Maragoto Rodriguez, O., additional, Marin Garcia, A.M., additional, Markert, J., additional, Matulewicz, T., additional, Mehta, S., additional, Merkin, M., additional, Meyer-Ahrens, A., additional, Michel, J., additional, Miedzik, P., additional, Mik, L., additional, Mikhailov, K., additional, Mikhaylov, V., additional, Militsija, V., additional, Mir, M.F., additional, Miskowiec, D., additional, Mohanty, B., additional, Momot, I., additional, Morgenweck, H., additional, Morhardt, T., additional, Morozov, S., additional, Mühlheim, D., additional, Müller, W.F.J., additional, Müntz, C., additional, Mukherjee, S., additional, Munkes, P., additional, Murin, Yu., additional, Nandy, E., additional, Naumann, L., additional, Nayak, T., additional, Nickels, F., additional, Niebur, W., additional, Nikulin, V., additional, Normanov, D., additional, Olar, A., additional, Otfinowski, P., additional, Otto, J.H., additional, Ovcharenko, E., additional, Pan, Liang-ming, additional, Panasenko, I., additional, Pandey, S., additional, Parfenov, P., additional, Parzhitskiy, S., additional, Patel, V., additional, Pauly, C., additional, Petráček, V., additional, Petri, M., additional, Petriş, M., additional, Petrovici, M., additional, Petukhov, O., additional, Pfeifer, D., additional, Pfistner, P., additional, Piasecki, K., additional, Pietraszko, J., additional, Pitsch, G., additional, Płaneta, R., additional, Plotnikov, V., additional, Plujko, V., additional, Pluta, J., additional, Poźniak, K., additional, Prasad, S.K., additional, Prokudin, M., additional, Prozorov, A., additional, Pugach, M., additional, Pugatch, V., additional, Puntke, A., additional, Querchfeld, S., additional, Radulescu, L., additional, Raha, S., additional, Raisig, P., additional, Raja, W., additional, Ramazanov, D., additional, Rautenberg, J., additional, Ray, R., additional, Redelbach, A., additional, Rehman, T., additional, Reinefeld, A., additional, Reshetin, A., additional, Ristea, C., additional, Ristea, O., additional, Rodriguez Rodriguez, A., additional, Roether, F., additional, Romaniuk, R., additional, Rost, A., additional, Rostchin, E., additional, Roy, A., additional, Roy, D., additional, Roy, S., additional, Rubio, E., additional, Rustamov, A., additional, Ryabov, Yu., additional, Sahoo, R., additional, Sahu, P.K., additional, Sahu, S.K., additional, Saini, J., additional, Salem, F., additional, Samanta, S., additional, Sambyal, S.S., additional, Samsonov, V., additional, Sander, O., additional, Sarangi, S., additional, Sau, S., additional, Schiaua, C., additional, Schintke, F., additional, Schmidt, C.J., additional, Schmidt, D., additional, Schmidt, H.R., additional, Schneider, P.M., additional, Schütt, T., additional, Seck, F., additional, Segal, I., additional, Selyuzhenkov, I., additional, Semennikov, A., additional, Sen, A., additional, Senger, A., additional, Senger, P., additional, Shabanov, A., additional, Shabunov, A., additional, Sharma, N., additional, Sheremetiev, A.D., additional, Shi, Shusu, additional, Shirinkin, S., additional, Shiroya, M., additional, Shitenkow, M., additional, Shumikhin, V., additional, Sibiryak, I., additional, Sidorenko, V., additional, Simon, C., additional, Simons, C., additional, Singh, A.K., additional, Singh, B.K., additional, Singh, C.P., additional, Singh, O., additional, Singh, R., additional, Singhal, V., additional, Škoda, L., additional, Smith, D., additional, Söhngen, Y., additional, Som, I., additional, Spicker, D., additional, Stach, D., additional, Staszel, P., additional, Storozhyk, D., additional, Strikhanov, M., additional, Stroth, J., additional, Stüllein, C., additional, Sturm, C., additional, Su, Yuan, additional, Sukhov, N., additional, Sultanov, R., additional, Sun, Yongjie, additional, Sun, Zhengyang, additional, Svirida, D., additional, Szczygieł, R., additional, Taranenko, A., additional, Tarassenkova, O., additional, Tölyhi, T., additional, Toia, A., additional, Topil'skaya, N., additional, Träger, M., additional, Traxler, M., additional, Trifonova, E., additional, Tsyupa, Yu., additional, Tuturas, N.G., additional, Uhlig, F., additional, Unger, K.L., additional, Usenko, E., additional, Varga, D., additional, Vassiliev, I., additional, Vasylyev, O., additional, Visinka, R., additional, Völkl, M., additional, Volkova, E., additional, Vorobiev, A., additional, Voronin, A., additional, Wahmes, L., additional, Wang, Botan, additional, Wang, Dong, additional, Wang, Tianxing, additional, Wang, Xinjian, additional, Wang, Yi, additional, Weber, A.A., additional, Weber, M., additional, Weidenkaff, P., additional, Weiglhofer, F., additional, Wessels, J.P., additional, Wielanek, D., additional, Wieloch, A., additional, Wilms, A., additional, Wójcik, D., additional, Wolf, Gy., additional, Wu, Ke-Jun, additional, Wu, Qiqi, additional, Yang, Junfeng, additional, Yang, Rongxing, additional, Yin, Zhongbao, additional, Yoo, In-Kwon, additional, Yuan, Jianhui, additional, Yushmanov, I., additional, Zabołotny, W., additional, Zaitsev, Yu., additional, Zamiatin, N.I., additional, Zbroszczyk, H., additional, Zhalov, M., additional, Zhang, Qiunan, additional, Zhang, Xiaoming, additional, Zhang, Yu, additional, Zhao, Yan-Qing, additional, Zheng, Sheng, additional, Zhou, Daicui, additional, Zhou, Jian, additional, Zhou, Wenxiong, additional, Zhu, Xianglei, additional, Zinchenko, A., additional, Zivko, I., additional, Żoładź, M., additional, Zorn, F., additional, Zubrzycka, W., additional, Zumbruch, P., additional, and Zyzak, M., additional

Published
2021
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30. Seismic Wavefield Separation Based on Sparsity Representation

Author

Zhao Yan-Qing and Xiao Yun-shi

Subjects
Underdetermined system, Acoustics, Boundary problem, 020206 networking & telecommunications, 02 engineering and technology, Dispersive body waves, 010502 geochemistry & geophysics, Polarization (waves), 01 natural sciences, Blind signal separation, Matrix decomposition, Time–frequency analysis, 0202 electrical engineering, electronic engineering, information engineering, Time domain, 0105 earth and related environmental sciences, Mathematics
Abstract

High fidelity wave separation is one of the key issues in process and application of seismic data. A method based on sparsity representation is presented in this paper according to underdetermined blind signal separation theory. It depends on polarization characteristics of seismic wavefield and sparsity of multi-component data in time-frequency domain. The method is a two-step method. Step one, we transform the seismic data from time domain to time-frequency domain and estimate polarization matrix. Step two, we separate pure waves in time-frequency domain and transform them back to time domain. The simulation results show that pure waves are separated accurately and amplitudes are maintained well without flaws such as wave mixing, aliasing and boundary problem, compared with conventional methods.

Published
2016

47. Analyses of viscoelastic responses of asphalt pavements under pulse loading.

Author

ZHAO Yan-qing, ZHOU Chang-hong, WANG Guo-zhong, and WANG Zhi-chao

Subjects
VISCOELASTICITY, ASPHALT pavements, ASPHALT concrete, STRAINS & stresses (Mechanics), SUPERPOSITION principle (Physics), COLLOCATION methods
Abstract

The effects of viscoelasticity and pulse loading should be taken into account in pavement response analyses in order to obtain realistic asphalt pavement behavior. So viscoelastic responses under pulse loading were investigated for surface deflection, tensile strain at the bottom of asphalt concrete (AC) layers and compressive strain at the top of subgrade. The unit response equations for the three responses were determined for a typical asphalt pavement, and Boltzmann superposition principle was then used to calculate the viscoelastic responses under haversine pulse loading. The effects of vehicle speed on the three types of pavement responses were also evaluated. It is shown that the unit response equations can be accurately represented using Prony series, and the coefficients can be determined by collocation method. The peak values of the viscoelastic responses increase with decreasing of vehicle speed and larger increases in peak values are obtained for tensile strain at the bottom of AC layers and compressive strain at the top of subgrade. [ABSTRACT FROM AUTHOR]

Published
2011

48. [Distribution of traditional Chinese medicine syndromes of diabetic retinopathy and correlation between symptoms].

Author

Zhao YQ, Li QS, Xiang MH, Zhang W, and Zhang XR

Subjects
China, Diagnosis, Differential, Humans, Qi, Syndrome, Yin Deficiency, Diabetic Retinopathy diagnosis, Medicine, Chinese Traditional
Abstract

To investigate the distribution of traditional Chinese medicine (TCM) Syndromes of diabetic retinopathy and explore the correlation between various symptoms. Based on the literature in databases of China Journal Full-text Database (CNKI), Wanfang database, VIP network, China biomedical literature database (CBM) and PubMed, SPSS 20.0 and IBM SPSS Modeler 14.1 software were used to analyze the location of disease, symptoms, tongue and pulse, and syndrome type distribution through frequency statistics. In addition, association rule algorithm was used to explore the basic rules for underlying symptoms combinations of diabetic retinopathy. A total of 560 articles were retrieved, and a total of 240 articles met the inclusion and exclusion criteria. In these documents, 62 types of TCM syndromes were found, involving 9 820 cases, 201 symptoms, 29 tongue conditions, and 36 pulses conditions; the first two locations for the disease were liver and kidney. Then the association rule analysis of high frequency symptoms was used to dig out 15 groups of latent syndrome, and 3 underlying symptom combinations among high frequency symptoms, tongue conditions and pulse conditions. The results of the study showed that Qi and yin deficiency was most common for the diabetic retinopathy, and the location of the disease was closely related to liver and kidney. In addition, these high-frequency symptoms and tongue conditions, pulse conditions, and underlying symptom combinations can occur as main symptoms at diagnosis, providing reference for us to study the epidemiology of PRO scale of the disease. They can also increase the weight of these symptoms directly as the main symptoms, which can be also used as an alternative entry pool for TCM syndrome diagnostic scale, laying foundation for the construction and optimization of TCM symptom database of diabetic retinopathy., Competing Interests: The authors of this article and the planning committee members and staff have no relevant financial relationships with commercial interests to disclose., (Copyright© by the Chinese Pharmaceutical Association.)

Published
2017
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49. [Analysis on medication regularity of modern traditional Chinese medicines in treating melancholia based on data mining technology].

Author

Zhao YQ, Teng J, and Yang HJ

Subjects
Data Mining, Drug Prescriptions, Humans, Treatment Outcome, Depressive Disorder drug therapy, Drugs, Chinese Herbal therapeutic use
Abstract

To analyze the prescription and medication regularities of traditional Chinese medicines in the treatment of melancholia in the Chinese journal full text database (CNKI), Wanfang Data knowledge service platform, VIP, Chinese biomedical literature database (CBM) in based on the traditional Chinese medicine inheritance support platform software, in order to provide reference for further mining traditional Chinese medicines for the treatment of melancholia and new drug development. The traditional Chinese medicine inheritance support platform software V2.0 was used to establish the prescription database of traditional Chinese medicines for treating melancholia. The software integrated data mining method was adopted to analyze four Qis, five flavors, meridian distribution, frequency statistics, syndrome distribution, composition regularity and new prescriptions. Totally 358 prescriptions for treating melancholia were analyzed to determine the frequency of prescription drugs, commonly used drug pairs and combinations and develop 22 new prescriptions. According to this study, prescriptions for treating depression collected in modern literature databases mainly have the effects in soothing liver and resolving melancholia, strengthening spleen and eliminating phlegm, activating and replenishing blood, regulating liver qi, tonifying spleen qi, clearing heat and purging heat, soothing the mind, nourishing yin and tonifying kidney, with neutral drug property and sweet or bitter flavor, and follow the melancholia treatment principle of "regulating qi and opening the mind, regulating qi and empathy".

Published
2015

50. [Analysis on composition and medication regularities of prescriptions treating hypochondriac pain based on traditional Chinese medicine inheritance support system inheritance support platform].

Author

Zhao YQ and Teng J

Subjects
Databases, Factual, Drug Prescriptions, Humans, Meridians, Drugs, Chinese Herbal chemistry, Drugs, Chinese Herbal therapeutic use, Pain drug therapy
Abstract

To analyze the composition and medication regularities of prescriptions treating hypochondriac pain in Chinese journal full-text database (CNKI) based on the traditional Chinese medicine inheritance support system, in order to provide a reference for further research and development for new traditional Chinese medicines treating hypochondriac pain. The traditional Chinese medicine inheritance support platform software V2. 0 was used to build a prescription database of Chinese medicines treating hypochondriac pain. The software integration data mining method was used to distribute prescriptions according to "four odors", "five flavors" and "meridians" in the database and achieve frequency statistics, syndrome distribution, prescription regularity and new prescription analysis. An analysis were made for 192 prescriptions treating hypochondriac pain to determine the frequencies of medicines in prescriptions, commonly used medicine pairs and combinations and summarize 15 new prescriptions. This study indicated that the prescriptions treating hypochondriac pain in Chinese journal full-text database are mostly those for soothing liver-qi stagnation, promoting qi and activating blood, clearing heat and promoting dampness, and invigorating spleen and removing phlem, with a cold property and bitter taste, and reflect the principles of "distinguish deficiency and excess and relieving pain by smoothening meridians" in treating hypochondriac pain.

Published
2015

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