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| 1 | Band structures of transverse waves in nanoscale multilayered phononic crystals with nonlocal interface imperfections by using the radial basis function method显示文摘A radial basis function collocation method based on the nonlocal elastic continuum theory is developed to compute the band structures of nanoscale multilayered phononic crystals. The effects of nonlocal imperfect interfaces on band structures of transverse waves propagating obliquely or vertically in the system are studied. The correctness of the present method is verified by comparing the numerical results with those obtained by applying the transfer matrix method in the case of nonlocal perfect interface. Furthermore, the influences of the nanoscale size, the impedance ratio and the incident angle on the cut-off frequency and band structures are investigated and discussed in detail. Numerical results show that the nonlocal interface imperfections have significant effects on the band structures in the macroscopic and microscopic scale. | Zhizhong Yan Chunqiu Wei Chuanzeng Zhang | 2017 | Acta Mechanica Sinica2017，33，2： | 2 |
| 2 | ELASTIC SH WAVE PROPAGATION IN PERIODIC LAYERED COMPOSITES WITH A PERIODIC ARRAY OF INTERFACE CRACKS显示文摘The interaction of anti-plane elastic SH waves with a periodic array of interface cracks in a multi-layered periodic medium is analyzed in this paper. A perfect periodic structure without interface cracks is first studied and the transmission displacement coefficient is obtained based on the transfer matrix method in conjunction with the Bloch-Floquet theorem. This is then generalized to a single and periodic distribution of cracks at the center interface and the result is compared with that of perfect periodic cases without interface cracks. The dependence of the transmission displacement coefficient on the frequency of the incident wave, the influences of material combination, crack configuration and incident angle are discussed in detail. Compared with the corresponding perfect periodic structure without interface cracks, a new phenomenon is found in the periodic layered system with a single and periodic array of interface cracks. | Zhizhong Yan Chunqiu Wei Chuanzeng Zhang | 2015 | Acta Mechanica Solida Sinica2015，28，5： | 2 |
| 3 | RBF collocation method and stability analysis for phononic crystals显示文摘The mesh-free radial basis function(RBF) collocation method is explored to calculate band structures of periodic composite structures. The inverse multi-quadric(MQ), Gaussian, and MQ RBFs are used to test the stability of the RBF collocation method in periodic structures. Much useful information is obtained. Due to the merits of the RBF collocation method, the general form in this paper can easily be applied in the high dimensional problems analysis. The stability is fully discussed with different RBFs.The choice of the shape parameter and the effects of the knot number are presented. | Chunqiu WEI Zhizhong YAN Hui ZHENG Chuanzeng ZHANG | 2016 | Applied Mathematics and Mechanics(English Edition)2016，37，5： | 1 |
| 4 | Band structures of elastic SH waves in nanoscale multi-layered functionally graded phononic crystals with/without nonlocal interface imperfections by using a local RBF collocation method显示文摘A meshless radial basis function(RBF) collocation method based on the Eringen nonlocal elasticity theory is developed to calculate the band structures of ternary and quaternary nanoscale multi-layered phononic crystals(PNCs) with functionally graded(FG) interlayers. Detailed calculations are performed for anti-plane transverse waves propagating in such PNCs. The influences of FG and homogeneous interlayers, component number, nonlocal interface imperfections and nanoscale size on cut-off frequency and band structures are investigated in detail. Numerical results show that these factors have significant effects on band structures at the macroscopic and microscopic scales. | Zhizhong Yan Chunqiu Wei Chuanzeng Zhang | 2017 | Acta Mechanica Solida Sinica2017，30，4： | 0 |
| 5 | The effect of different gravity fields on mass transfer in the rat bone lacunar-canalicular system显示文摘The bone lacunar-canalicular system(LCS)is an important microscopic infrastructure for signaling and solute transport in bone tissue,which guarantees normal physiological processes of the tissue,but the mass transfer laws in the LCS under different gravity fields have not yet been clarified.SD rats were injected intraperitoneally with different concentrations of sodium fluorescein tracer and subjected to mass transfer experiments in the LCS under normal gravity and hypergravity.The fluorescence distribution in the osteon was observed using laser scanning confocal microscopy.The hypergravity environment was provided by a self-designed high-G loading centrifuge.The fluorescence intensity of the Haversian canal in the osteon was the highest.The fluorescence intensity of lacunae farther away from the Haversian canal was lower,and the fitted curve was parabolic.With the increasing distance from the Haversian canal,the curve first rapidly decreased,and then the decreasing trend gradually became slower.Hypergravity promoted mass transfer in the LCS,and the 10 G hypergravity showed varying degrees of fluorescence intensity in each layer of the osteon relative to normal gravity,with intensity enhancements in the range of 132.7–249.0%.The fluorescence intensity was also significantly increased when the tracer concentration was halved and the gravity field magnitude was increased to 10G.In conclusion,hypergravity promoted the transport of solute molecules,nutrients,and signaling molecules within the LCS.The effect of hypergravity on mass transfer in the LCS was greater than that of tracer concentration.This may help to understand bone diseases from a mass transfer perspective. | Hao Wang Jiaming Wang Kangning Li Lilan Gao Aiguo Wang Shuping Wei Linwei Lyu Chunqiu Zhang | 2023 | Medicine in Novel Technology and Devices2023，，1： | 0 |
| 6 | A rank-based multiple-choice secretary algorithm for minimising microgrid operating cost under uncertainties显示文摘The increasing use of distributed energy resources changes the way to manage the electricity system.Unlike the traditional centralized powered utility,many homes and businesses with local electricity generators have established their own microgrids,which increases the use of renewable energy while introducing a new challenge to the management of the microgrid system from the mismatch and unknown of renewable energy generations,load demands,and dynamic electricity prices.To address this challenge,a rank-based multiple-choice secretary algorithm(RMSA)was proposed for microgrid management,to reduce the microgrid operating cost.Rather than relying on the complete information of future dynamic variables or accurate predictive approaches,a lightweight solution was used to make real-time decisions under uncertainties.The RMSA enables a microgrid to reduce the operating cost by determining the best electricity purchase timing for each task under dynamic pricing.Extensive experiments were conducted on real-world data sets to prove the efficacy of our solution in complex and divergent real-world scenarios. | Chunqiu Xia Wei Li Xiaomin Chang Ting Yang Albert Y.Zomaya | 2023 | Frontiers in Energy2023，17，2： | 0 |
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