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Numerical Investigation on the Flow Mechanism of Multi-Peak Frequency Feature of Rotating Instability

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Journal of Thermal Science 2021年第2期30卷 668-681页

作者： wang Hao WU Yadong YUE Shaoyuan wang Yan'gang School of Power and Energy Northwestern Polytechnical UniversityXi'an 710072China School of Mechanical Engineering Shanghai Jiao Tong UniversityShanghai 200240China

In this paper,the rotating instability(RI)in an axial compressor has been investigated numerically in order to examine the capability of URANS method to simulate its typical characteristics of RI broadband humps with multi-peak frequencies(MPFs)and further to uncover the underlying flow mechanism.A full-annulus modeling solution has been adopted to fully capture the wide range of different length-scale flow disturbances that circumferentially propagating around the compressor *** the transient computing process,long-term monitoring up to 50 revolutions has been carried out to achieve a fine frequency resolution,and that would be essential for resolving the MPFs with small frequency *** is shown that the MPFs feature of RI has been successfully captured by the full-annulus URANS approach,and also its frequency range and spectral feature agree well with the experimental ***,with a circumferential mode decomposition on the MPFs characteristics of RI,it has been found that the MPFs result from the interaction between long-and short-scale flow disturbances which circumferentially propagate around the compressor rotor near the clearance *** examination on the numerical three dimensional flow field indicates that the short-scale disturbance is induced by the unsteady oscillation of tip clearance vortexes with inter-passage phase *** long-scale disturbance is caused by the mistuning of the wave number of the short-scale disturbance and the blade number within the whole annulus.

关键词： axial compressor rotating instability multiple frequency peaks URANS tip leakage vortex

Vector hidden-bottom tetraquark candidate: Y(10750)

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Chinese Physics C 2019年第12期43卷 13-23页

作者： Zhi-gang wang Department of Physics North China Electric Power UniversityBaoding 071003China

In this article,we take the scalar diquark and antidiquark operators as the basic constituents,and construct the Cγ5■γ5C type tetraquark current to study Y（10750） with the QCD sum *** predicted mass MY=10.75±0.10 GeV and width ΓY=33.60-9.45+16.64 MeV support the assignment of Y（10750） as the diquark-antidiquark type vector hidden-bottom tetraquark state,with a relative P-wave between the diquark and antidiquark constituents.

关键词： tetraquark state QCD sum rules

Progress in Treatment of Gout Using Chinese and Western Medicine

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Chinese Journal of Integrative Medicine 2020年第1期26卷 8-13页

作者： wang Xiang wang Yan-gang Department of Endocrinology The Affiliated Hospital of Medical College Qingdao University

Gout is a crystal-related arthropathy resulting from the deposition of monosodium urate. Identifying appropriate treatments and novel drugs to decrease serum uric acid(SUA) levels and gout risk has been a major focus. By performing extensive literature review on the pathogenesis and Chinese and Western medicine treatment of gout, this paper aimed to identify novel targets for effective control of acute gout attacks and long-term reduction of SUA. In addition, we aimed to provide new directions for the improvement of therapeutic measures and the development of drugs. Although Western medicine can significantly contribute to the treatment of gout, Chinese herbal medicine has unique advantages, including reduced adverse reactions and higher patient compliance. It may also fill in the shortcomings of Western medicine in the intermittent period treatment of gout. In addition to constantly exploring pathogenesis and drug targets, research on Chinese herbal medicine is equally important. The combination of Chinese and Western medicine has proven to become an important direction for gout treatment.

关键词： gout therapy research progress Chinese medicine Western medicine

Analysis of Z_(cs)(3985)as the axialvector tetraquark state

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Chinese Physics C 2021年第7期45卷 82-90页

作者： Zhi-gang wang Department of Physics North China Electric Power UniversityBaoding 071003China

In this study,we choose the scalar and axialvector diquark operators in the color antitriplet as the fundamental building blocks to construct four-quark currents and investigate the diquark-antidiquark type axialvector tetraquark states ccus in the framework of the QCD sum *** predicted tetraquark massM_(Z)=3.99±0.09GeV is in excellent agreement with the experimental value 3985.2^(+2.1)_(-2.0)±1.7 MeV from the BESⅢ collaboration,which supports identifying Z_{cs}(3985) as the cousin of Z_(c)(3900) with quantum numbers J^(PC)=1^(+-).We take into account the light flavor SU(3) mass-breaking effect to estimate the mass spectrum of the diquark-antidiquark type hidden-charm tetraquark states with strangeness according to previous studies.

关键词： tetraquark state QCD sum rules XYZ particles

Ground states and first radial excitations of vector tetraquark states with explicit P-waves via QCD sum rules

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Chinese Physics C 2024年第10期48卷 40-47页

作者： Zhi-gang wang Department of Physics North China Electric Power UniversityBaoding 071003China

In this study,we chose the diquark-antidiquark type four-quark cuents with an explicit P-wave betweenthe diquark and antidiquark pairs to study the ground states and first radial exeitations of the hidden-charm *** states with quantum numbers J^(PC)=1^(--).We also obtained the lowest vector tetraguark masses and made *** assignments of the existing Ystates,There indeed exists a hidden-charm tetraquark state with J^(PC)=1^(--) at anenergy of approximately 4.75 GeV as the first radial exeitation that accounts for the BESIII data.

关键词： tetraguark state QCD sum rules

Modelling spiky acceleration response of dilative sand deposits during earthquakes with emphasis on large post-liquefaction deformation

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Earthquake Engineering and Engineering Vibration 2018年第1期17卷 125-138页

作者： wang gang Wei Xing John Zhao Key Laboratory of New Technology for Construction of Cities in Mountain Area Chongqing University School of Civil Engineering Chongqing University School of Civil Engineering Southwest Jiaotong University

The acceleration records at some liquefied sand deposits exhibit a distinctive spiky waveform, characterized by strong amplification and high-frequency components. A comprehensive constitutive model was used to analyze the mechanism of such spiky acceleration responses. An idealized single-degree-of-freedom（SDF） system was constructed, in which the force-displacement relation of the spring follows the stress-strain behavior of saturated sand during undrained shearing. The SDF system demonstrated that the spikes are directly related to the strain-hardening behavior of sand during post-liquefaction cyclic shearing. Furthermore, there exists a threshold shear strain length, which is in accordance with the limited amplitude of the fluid-like shear strain generated at instantaneous zero effective stress state during the post-liquefaction stage. The spiky acceleration can only occur when the cyclic shear strain exceeds the threshold shear strain length. It is also revealed that the time intervals between the acceleration spikes increase gradually along with the continuation of shaking because the threshold shear strain length increases gradually and then more time is needed to generate larger shear strain to cause strain hardening. Records at the Kushiro Port site and Port Island site during past earthquakes are simulated through the fully coupled method to validate the presented mechanism.

关键词： spiky acceleration cyclic mobility post-liquefaction seismic response sand

Scalar or Vector Tetraquark State Candidate: Z_c(4100)

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Communications in Theoretical Physics 2019年第11期71卷 1319-1327页

作者： Zhi-gang wang Department of Physics North China Electric Power University

In this article, we separate the vector and axialvector components of the tensor diquark operators explicitly,construct the axialvector-axialvector type and vector-vector type scalar tetraquark currents and scalar-tensor type tensor tetraquark current to study the scalar, vector and axialvector tetraquark states with the QCD sum rules in a consistent way. The present calculations do not favor assigning the Zc(4100) to be a scalar or vector tetraquark state. If the Zc(4100) is a scalar tetraquark state without mixing effects, it should have a mass about 3.9 GeV or 4.0 GeV rather than4.1 GeV;on the other hand, if the Zc(4100) is a vector tetraquark state, it should have a mass about 4.2 GeV rather than 4.1 GeV. However, if we introduce mixing, a mixing scalar tetraquark state can have a mass about 4.1 GeV. As a byproduct, we obtain an axialvector tetraquark candidate for the Zc(4020).

关键词： Tetraquark state QCD sum rules

Analysis of Vector Meson Transitions Among Heavy Quarkonium States

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Communications in Theoretical Physics 2012年第1期57卷 93-101页

作者： wang Zhi-gang Department of Physics North China Electric Power UniversityBaoding 071003China

In this article,we study the vector meson transitions among the charmonium and bottomonium states with the heavy quark effective theory in a systematic way,and make predictions for the ratios among the vector meson decay widths of a special multiplet to another *** predictions can be confronted with the experimental data in the future.

关键词： charmonium states bottomonium states vector meson transitions

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引入围岩结构观测系统在地应力测试中的应用

煤 2025年第1期34卷 23-26,45页

作者：高青松汪刚潞安化工集团阳泉五矿山西平定045200 西安科技大学能源学院陕西西安710054

为减小水压致裂法测量地应力时的误差,提高地应力测量成功率与测试结果精度,引入围岩结构观测系统,以某矿8510回风巷为研究背景,开展地应力测试对照试验。试验结果表明:在未引入围岩结果测试系统时,8510回风巷最大水平主应力为8.14 MPa... 详细信息

为减小水压致裂法测量地应力时的误差,提高地应力测量成功率与测试结果精度,引入围岩结构观测系统,以某矿8510回风巷为研究背景,开展地应力测试对照试验。试验结果表明:在未引入围岩结果测试系统时,8510回风巷最大水平主应力为8.14 MPa,垂直主应力为11.06 MPa,垂直构造应力占优势,测压比的范围在0.40~0.74之间;引入围岩结构测试系统后,8103回风巷最大水平主应力为14.95 MPa,垂直主应力为11.04 MPa,水平构造应力占优势,测压比的范围在0.69~1.35之间,与区域已测得地应力场较吻合。引入围岩结构测试系统的水压致裂法测量地应力方便、快捷,且所测结果更加真实可靠。

关键词：地应力测试围岩结构观测水压致裂法围岩应力