المؤلفون: Cui, Xiao-Tong (AUTHOR), Jiang, Nan (AUTHOR) nanj@tju.edu.cn, Tang, Zhan-Qi (AUTHOR) zhanqitang@tju.edu.cn

المصدر: Chinese Physics B. Jan2021, Vol. 30 Issue 1, p1-9. 9p.

مصطلحات موضوعية: *BOUNDARY layer (Aerodynamics), *DATABASES, *TURBULENCE

مستخلص: Active control of a fully developed turbulence boundary layer (TBL) over a flat plate has been investigated with a statistical view. The piezoelectric (PZT) oscillator is employed to produce periodic input into the inner region of the TBL. A wall probe is fixed upstream of the oscillator to identify the high- or low-speed fluctuations as the detecting signals. Then, the impact of the detecting signals on the small-scale bursting process is investigated based on the data acquired by the traversing probe downstream of the oscillator. The results indicate that the small-scale bursting intensity is restrained more apparently at high-speed detecting fluctuations but less impacted at low-speed detecting fluctuations. Furthermore, the perturbed-scale fluctuations arrange the small-scale bursting process in the near-wall region. The detecting signals have an obvious impact on this arrangement, especially the high-intensity regions of the small-scale bursting events: the vibration enhances the intensity at high-speed detecting signals but weakens it at low-speed detecting signals in these regions, which gives a direct evidence on how detecting signals interfering the small-scale bursting process. [ABSTRACT FROM AUTHOR]

المؤلفون: Tian, Ying-Yi, Wang, Shuan-Hu, Li, Gang, Li, Hao, Li, Shu-Qin, Zhao, Yang, Cui, Xiao-Min, Wang, Jian-Yuan, Zou, Lv-Kuan, Jin, Ke-Xin

المصدر: Chinese Physics B; Oct2020, Vol. 29 Issue 11, p1-6, 6p

مصطلحات موضوعية: MAGNETIC moments, MAGNETIZATION, TORQUE, MAGNETIC fields, MOMENTS method (Statistics)

مستخلص: In this work, we report the reorientation of magnetization by spin–orbit torque (SOT) in YIG/Pt bilayers. The SOT is investigated by measuring the spin Hall magnetoresistance (SMR), which is highly sensitive to the direction of magnetic moment of YIG. An external in-plane rotating magnetic field which is applied to the YIG/Pt bilayers, and the evolutions of SMR under different injected currents in the Pt layer, result in deviation of SMR curve from the standard shape. We conclude that the SOT caused by spin accumulation near the interface between YIG and Pt can effectively reorient the in-plane magnetic moment of YIG. This discovery provides an effective way to modulate YIG magnetic moments by electrical methods. [ABSTRACT FROM AUTHOR]

: Copyright of Chinese Physics B is the property of IOP Publishing and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

المؤلفون: Wang Jing-Shu, Wang Ling-Sheng, Cui Xiao-Yan, Lv Xiu-Mei, Yang Jing-hai, Li Xue-Fei, HU Ting-Jing, Gao Chun-Xiao

المصدر: Chinese Physics B. 24:116401

مصطلحات موضوعية: Phase transition, Electron mobility, Materials science, Valence (chemistry), Condensed matter physics, General Physics and Astronomy, chemistry.chemical_element, macromolecular substances, Zinc, Semimetal, stomatognathic system, chemistry, Hall effect, Electrical resistivity and conductivity, Phase (matter)

الوصف: We investigate the carrier behavior of HgTe under high pressures up to 23 GPa using in situ Hall effect measurements. As the phase transitions from zinc blende to cinnabar, then to rock salt, and finally to Cmcm occur, all the parameters change discontinuously. The conductivity variation under compression is described by the carrier parameters. For the zinc blende phase, both the decrease of carrier concentration and the increase of mobility indicate the overlapped valence band and conduction band separates with pressure. Pressure causes an increase in the hole concentration of HgTe in the cinnabar phase, which leads to the carrier-type inversion and the lowest mobility at 5.6 GPa. In the phase transition process from zinc blende to rock salt, Te atoms are the major ones in atomic movements in the pressure regions of 1.0–1.5 GPa and 1.8–3.1 GPa, whereas Hg atoms are the major ones in the pressure regions of 1.5–1.8 GPa and 3.1–7.7 GPa. The polar optical scattering of the rock salt phase decreases with pressure.

الوصول الحر: https://explore.openaire.eu/search/publication?articleId=doi_________::dc8265fb76097e8c34becb636ee7846cTest
https://doi.org/10.1088/1674-1056/24/11/116401Test

المؤلفون: Zhou Haomiao, Cui Xiao-Le

المصدر: Chinese Physics B. 24:077506

مصطلحات موضوعية: Coupling, Materials science, Surface-area-to-volume ratio, Condensed matter physics, General Physics and Astronomy, Equivalent circuit, Magnetostriction, Magneto, Piezoelectricity, Voltage, Magnetic field

الوصف: The nonlinear thermo–magneto–mechanical magnetostrictive constitutive and the linear thermo–mechanical-electric piezoelectric constitutive are adopted in this paper. The bias magnetic field and ambient temperature are equivalent to a magnetic source and a thermo source, respectively. An equivalent circuit, which contains a magnetic source and a thermo source at the input, for the thermo–magneto–electric coupling effect in magnetoelectric (ME) laminates, is established. The theoretical models of the output voltage and static ME coefficient for ME laminates can be derived from this equivalent circuit model. The predicted static ME coefficient versus temperature curves are in excellent agreement with the experimental data available both qualitatively and quantitatively. It confirms the validity of the proposed model. Then the models are adopted to predict variations in the output voltages and ME coefficients in the laminates under different ambient temperatures, bias magnetic fields, and the volume ratios of magnetostrictive phases. This shows that the output voltage increases with both increasing temperature and increasing volume ratio of magnetostrictive phases; the ME coefficient decreases with increasing temperature; the ME coefficient shows an initial sharp increase and then decreases slowly with the increase in the bias magnetic field, and there is an optimum volume ratio of magnetostrictive phases that maximize the ME coefficient. This paper can not only provide a new idea for the study of the thermo–magneto–electric coupling characteristics of ME laminates, but also provide a theoretical basis for the design and application of ME laminates, operating under different sensors.

الوصول الحر: https://explore.openaire.eu/search/publication?articleId=doi_________::543f98f2584311f422be74d4d33615a3Test
https://doi.org/10.1088/1674-1056/24/7/077506Test

المؤلفون: Li Xue-Fei, Wang Jing-Shu, Lv Xiu-Mei, Wang Ling-Sheng, Yang Jing-Hai, Hu Ting-Jing, Cui Xiao-Yan, Gao Chun-Xiao

المصدر: Chinese Physics B; Nov 2015, Vol. 24 Issue 11, p1-1, 1p

مصطلحات موضوعية: MERCURY telluride, HALL effect, PHASE transitions, SEMICONDUCTORS, PHYSICS research

مستخلص: We investigate the carrier behavior of HgTe under high pressures up to 23 GPa using in situ Hall effect measurements. As the phase transitions from zinc blende to cinnabar, then to rock salt, and finally to Cmcm occur, all the parameters change discontinuously. The conductivity variation under compression is described by the carrier parameters. For the zinc blende phase, both the decrease of carrier concentration and the increase of mobility indicate the overlapped valence band and conduction band separates with pressure. Pressure causes an increase in the hole concentration of HgTe in the cinnabar phase, which leads to the carrier-type inversion and the lowest mobility at 5.6 GPa. In the phase transition process from zinc blende to rock salt, Te atoms are the major ones in atomic movements in the pressure regions of 1.0–1.5 GPa and 1.8–3.1 GPa, whereas Hg atoms are the major ones in the pressure regions of 1.5–1.8 GPa and 3.1–7.7 GPa. The polar optical scattering of the rock salt phase decreases with pressure. [ABSTRACT FROM AUTHOR]

: Copyright of Chinese Physics B is the property of IOP Publishing and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

المؤلفون: Cui Xiao-Le¹, Zhou Hao-Miao^1,2

المصدر: Chinese Physics B. Jul2015, Vol. 24 Issue 7, p1-1. 1p.

مصطلحات موضوعية: *MAGNETOELECTRIC effect, *ELECTRIC field effects, *ELECTROMAGNETISM, *MAGNETOSTRICTIVE devices, *MAGNETORESISTIVE devices, *MAGNETIC field effects

مستخلص: The nonlinear thermo–magneto–mechanical magnetostrictive constitutive and the linear thermo–mechanical-electric piezoelectric constitutive are adopted in this paper. The bias magnetic field and ambient temperature are equivalent to a magnetic source and a thermo source, respectively. An equivalent circuit, which contains a magnetic source and a thermo source at the input, for the thermo–magneto–electric coupling effect in magnetoelectric (ME) laminates, is established. The theoretical models of the output voltage and static ME coefficient for ME laminates can be derived from this equivalent circuit model. The predicted static ME coefficient versus temperature curves are in excellent agreement with the experimental data available both qualitatively and quantitatively. It confirms the validity of the proposed model. Then the models are adopted to predict variations in the output voltages and ME coefficients in the laminates under different ambient temperatures, bias magnetic fields, and the volume ratios of magnetostrictive phases. This shows that the output voltage increases with both increasing temperature and increasing volume ratio of magnetostrictive phases; the ME coefficient decreases with increasing temperature; the ME coefficient shows an initial sharp increase and then decreases slowly with the increase in the bias magnetic field, and there is an optimum volume ratio of magnetostrictive phases that maximize the ME coefficient. This paper can not only provide a new idea for the study of the thermo–magneto–electric coupling characteristics of ME laminates, but also provide a theoretical basis for the design and application of ME laminates, operating under different sensors. [ABSTRACT FROM AUTHOR]

المؤلفون: Xia Hua, Wu Bian, Zhang Zhi-Rong, Pang Tao, Sun Peng-Shuai, Cui Xiao-Juan, Han Luo, Wang Yu, Dong Feng-Zhong

المصدر: Chinese Physics B; Mar2015, Vol. 24 Issue 3, p1-1, 1p

مصطلحات موضوعية: HYDROGEN sulfide, MODULATION spectroscopy, ABSORPTION spectra, SEMICONDUCTOR lasers, TRACE gases

مستخلص: Sensitive detection of hydrogen sulfide (H2S) has been performed by means of wavelength modulation spectroscopy (WMS) near 1.578 μm. With the scan amplitude and the stability of the background baseline taken into account, the response time is 4 s for a 0.8 L multi-pass cell with a 56.7 m effective optical path length. Moreover, the linearity has been tested in the 0–50 ppmv range. The detection limit achievable by the Allan variance is 224 ppb within 24 s under room temperature and ambient pressure conditions. This tunable diode laser absorption spectroscopy (TDLAS) system for H2S detection has the feasibility of real-time online monitoring in many applications. [ABSTRACT FROM AUTHOR]

: Copyright of Chinese Physics B is the property of IOP Publishing and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

المؤلفون: Hou Meng-Jing, Zhang Xian, Cui Xiao-Yang, Liu Can, Li Zheng-Cao, Zhang Zheng-Jun

المصدر: Chinese Physics B; Mar2015, Vol. 24 Issue 3, p1-1, 1p

مصطلحات موضوعية: POLLUTANTS, GOLD nanoparticles, SERS spectroscopy, RAMAN scattering, POLYCHLORINATED biphenyls, SCANNING electron microscopes, TRANSMISSION electron microscopes

مستخلص: An effective surface enhanced Raman scattering (SERS) substrate is designed and fabricated by synthesis of SiO2 nanorods array via glancing angle deposition, followed by coating Au nanoparticles onto SiO2 surface in order to create numerous “hot spots”. The detecting sensitivity of such substrate could be optimized by simply adjusting the deposition time of Au. Thus, it can be used for detection of Rhodamine 6G at concentration as low as 10⁻⁹ M. Furthermore, our SERS substrate is applied to detect 5 μg/g polychlorinated biphenyls in soil sample, which proves its potential for trace environmental pollutants detection. [ABSTRACT FROM AUTHOR]

: Copyright of Chinese Physics B is the property of IOP Publishing and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

المؤلفون: Cui Xiao, Peng Ling, Zhang Zhen, Cai Shu, Hui and, Chen Zhong

المصدر: Chinese Physics B. Nov2011, Vol. 20 Issue 11, p118201-118201. 1p.

مصطلحات موضوعية: *SOLVENTS, *RADIATION damping, *NUCLEAR magnetic resonance spectroscopy, *SIGNAL processing, *PHYSICS experiments, *MATHEMATICAL sequences

مستخلص: Radiation damping effects induced by the dominated solvent in a solution sample can be applied to suppress the solvent signal. The precession pathway and rate back to equilibrium state between solute and solvent spins are different under radiation damping. In this paper, a series of pulse sequences using radiation damping were designed for the solvent suppression in nuclear magnetic resonance (NMR) spectroscopy. Compared to the WATERGATE method, the solute signals adjacent to the solvent would not be influenced by using the radiation damping method. The one-dimensional (1D) 1H NMR, two-dimensional (2D) gCOSY, and J-resolved experimental results show the practicability of solvent suppression via radiation damping effects in 1D and 2D NMR spectroscopy. [ABSTRACT FROM AUTHOR]

المؤلفون: Cui Xiao, Peng and, Li Xiao

المصدر: Chinese Physics B. Oct2011, Vol. 20 Issue 10, p109201-109201. 1p.

مصطلحات موضوعية: *DIURNAL variations of rainfall, *THERMAL analysis, *CONVECTION (Meteorology), *OCEANOGRAPHY, *TEMPERATURE effect, *SIMULATION methods & models, *MICROPHYSICS

مستخلص: The diurnal variation of radiation plays a key role in determining the diurnal variations of tropical oceanic convective and stratiform rainfall, and the examination of such a relationship requires a direct link between the radiation term in a heat budget and the surface rain rate in a cloud budget. Thus, the thermally related surface rainfall budgets derived from the combination of cloud and heat budgets are analysed with two-dimensional equilibrium cloud-resolving model simulation data to study the effects of sea surface temperature (SST) and cloud radiative, and microphysical processes on the diurnal variations of convective and stratiform rainfall. The results show that the increase in SST, the inclusion of diurnal variation of SST and the exclusion of cloud radiative processes increase negative diurnal anomalies of heat divergence over rainfall-free regions during the nighttime through changing the vertical structures of diurnal anomaly of radiation in the troposphere. The strengthened negative diurnal anomalies of heat divergence over rainfall-free regions enhance positive diurnal anomalies of heat divergence over convective regions, which intensifies the positive diurnal anomaly of convective rainfall. The exclusion of microphysical effects of ice clouds increases the negative diurnal anomaly of heat divergence over rainfall-free regions during the nighttime through reducing latent heat; this appears to enhance the positive diurnal anomaly of heat divergence over raining stratiform regions, and thus stratiform rainfall. [ABSTRACT FROM AUTHOR]