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89 results on '"Zhang, Suying"'

1. Soliton sheets formed by interference of Bose-Einstein condensates in optical lattices

Author

Wang, Shusong and Zhang, Suying

Subjects
Condensed Matter - Quantum Gases, Quantum Physics
Abstract

Soliton sheets which are formed by interference of Bose Einstein condensates occupying different single-particle states are observed in optical lattice potential. This structure consists of one-dimensional stationary solitons arranged periodically along the peaks of optical lattice (y direction) with the phase difference between the two sides of the soliton sheets is a linear function of y in each period, so we call it soliton sheet. A y component velocity difference exists between the two sides of the soliton sheet. Similar velocity distributions can be produced by the alignment of an infinite number of isotropic vortices along the peaks of the optical lattice. Their difference is that the soliton sheet structure is not limited by the number of phase singularities and can be generated even without phase singularities.

Published
2024

8. Gauge-potential-induced rotation of spin-orbit-coupled Bose-Einstein condensates

Author

Jin, Jingjing, Han, Wei, and Zhang, Suying

Subjects
Condensed Matter - Quantum Gases
Abstract

We demonstrate that a spin-orbit-coupled Bose-Einstein condensate can be effectively rotated by adding a real magnetic field to inputting gauge angular momentum, which is distinctly different from the traditional ways of rotation by stirring or Raman laser dressing to inputting canonical angular momentum. The gauge angular momentum is accompanied by the spontaneous generation of equal and opposite canonical angular momentum in the ground states, and it leads to the nucleation of quantized vortices. We explain this by indicating that the effective rotation with the vortex nucleation results from the effective magnetic flux induced by the gauge potential, which is essentially different from the previous scheme of creating vortices by synthetic magnetic fields. In the weakly interacting regime, symmetrically placed domains separated by vortex lines as well as half-integer giant vortices are discovered. With relatively strong interatomic interaction, we predict a structure of coaxially arranged annular vortex arrays, which is in stark contrast to the familiar Abrikosov vortex lattice. The developed way of rotation may be extended to a more general gauge system.

Published
2018
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11. Ground-state cooling of the mechanical oscillator in a two-cavity optomechanical system.

Author

Chang, Rui, Liu, Ni, and Zhang, Suying

Subjects
QUANTUM perturbations, COOLING, QUANTUM interference, LANGEVIN equations, OPTICAL spectra
Abstract

In this paper, we theoretically study the ground-state cooling of the mechanical oscillator by an electromagnetically-induced transparency (EIT)-like cooling mechanism in a two-cavity optomechanical system, with a quarter-wave plate placed inside, which plays a linear coupling role in the two cavities. Based on the perturbation theory and quantum Langevin equation, we derive the rate equation of the mechanical oscillator and the fluctuation spectrum of the effective optical force. We find that the maximum value of optical fluctuation spectrum corresponds to the cooling process of the mechanical oscillator, and the minimum value of optical fluctuation spectrum corresponds to the heating process of the mechanical oscillator. With the help of the quarter-wave plate, the heating process can be greatly suppressed due to the quantum interference effect. The ground-state cooling of the mechanical oscillator via such an EIT-like cooling mechanism can be implemented beyond the resolved sideband regime. [ABSTRACT FROM AUTHOR]

Published
2024
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12. Design and Implementation of Speech Recognition System Based on Gesture Control

Author

Wang, Zuliang, Cao, Chuangle, Zhang, Suying, Kacprzyk, Janusz, Series Editor, Pal, Nikhil R., Advisory Editor, Bello Perez, Rafael, Advisory Editor, Corchado, Emilio S., Advisory Editor, Hagras, Hani, Advisory Editor, Kóczy, László T., Advisory Editor, Kreinovich, Vladik, Advisory Editor, Lin, Chin-Teng, Advisory Editor, Lu, Jie, Advisory Editor, Melin, Patricia, Advisory Editor, Nedjah, Nadia, Advisory Editor, Nguyen, Ngoc Thanh, Advisory Editor, Wang, Jun, Advisory Editor, Huang, Chuanchao, editor, Chan, Yu-Wei, editor, and Yen, Neil, editor

Published
2020
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15. The performance of double exponentially weighted moving average control charts for monitoring the coefficient of variation.

Author

Hu, XueLong, Zhang, SuYing, Zhou, XiaoJian, Tang, AnAn, and Xie, FuPeng

Subjects
*MOVING average process, *QUALITY control charts, *COMPUTER simulation, *INDUSTRIAL applications
Abstract

The coefficient of variation (CV) is one of the most important quality characteristics in industrial applications. There have been some control charts for monitoring this dimensionless and normalized characteristic. This paper presents three double exponentially weighted moving average (DEWMA) charts for monitoring the CV. Many numerical simulations are performed and the results are given in several tables to show the properties of the proposed DEWMA CV charts. Through comparisons with other existing exponentially weighted moving average (EWMA) CV charts using the average run length (ARL) metric, it is shown that the proposed DEWMA CV charts perform better than the existing EWMA CV charts for small shifts, especially when the smoothing parameter increases. In addition, a detailed comparison among the proposed three DEWMA CV charts is also presented. A real date example from industry is used to show the implementation of the proposed charts. [ABSTRACT FROM AUTHOR]

Published
2024
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16. Compact meta-differentiator for achieving isotropically high-contrast ultrasonic imaging.

Author

Jia, Yurou, Zhang, Suying, Zhang, Xuan, Long, Houyou, Xu, Caibin, Bai, Yechao, Cheng, Ying, Wu, Dajian, Deng, Mingxi, Qiu, Cheng-Wei, and Liu, Xiaojun

Subjects
DIAGNOSIS, ULTRASONIC imaging, OPTICAL vortices, BIOMEDICAL engineering, ON-chip charge pumps, CONTRAST media, BIOLOGICAL models
Abstract

Ultrasonic imaging is crucial in the fields of biomedical engineering for its deep penetration capabilities and non-ionizing nature. However, traditional techniques heavily rely on impedance differences within objects, resulting in poor contrast when imaging acoustically transparent targets. Here, we propose a compact spatial differentiator for underwater isotropic edge-enhanced imaging, which enhances the imaging contrast without the need for contrast agents or external physical fields. This design incorporates an amplitude meta-grating for linear transmission along the radial direction, combined with a phase meta-grating that utilizes focus and spiral phases with a first-order topological charge. Through theoretical analysis, numerical simulations, and experimental validation, we substantiate the effectiveness of our technique in distinguishing amplitude objects with isotropic edge enhancements. Importantly, this method also enables the accurate detection of both phase objects and artificial biological models. This breakthrough creates new opportunities for applications in medical diagnosis and nondestructive testing. High-contrast ultrasonic imaging holds significant importance in biomedical and engineering applications. Here, the authors present a compact spatial differentiator tailored for underwater isotropic edge-enhanced imaging, facilitating the realization of high-contrast ultrasonic imaging. [ABSTRACT FROM AUTHOR]

Published
2024
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22. Effect of tenofovir disoproxil and telbivudine on the growth and development of infants by blocking mother-to-child transmission of hepatitis B virus

Author

Tao, Chengjing, Hu, Jiannv, Zhang, Suying, Bai, Xiuli, Zhao, Chun, Zuo, Zhongbao, and Liu, Shourong

Subjects
Tenofovir disoproxil, Telbivudine, Blocking hepatitis B virus, Mother-to-child transmission, Infants, Growth and development, Pharmaceutical Science, Pharmacology (medical)
Abstract

Purpose: To investigate the effect of tenofovir disoproxil and telbivudine on the growth and development of infants after blocking mother-to-child transmission (MTCT) of hepatitis B virus (HBV). Methods: Seventy pregnant women with chronic hepatitis B (CHB) were recruited and allocated to tenofovir disoproxil group (n = 35) and telbivudine group (n = 35) using random number table method. Tenofovir disoproxil group was given 300 mg tenofovir disoproxil orally four times daily, while telbivudine group was given telbivudine 600 mg orally four times daily. Results: After treatment, both groups showed no significant differences in serum HBV-DNA and ALT levels before delivery and 3 months after delivery (p > 0.05). Both groups showed no remarkable differences in the incidence of hypohydramnios, cholestasis, hypothyroidism, anemia, prolonged labor, fetal distress, and placental adhesions (p > 0.05). Both groups showed no significant differences in the rates of premature rupture of membranes, preterm birth, vaginal delivery, and cesarean section (p > 0.05). Both groups showed no significant differences in neonatal sex, gestational age at birth, weight, length, and Apgar scores (p > 0.05). The differences in the positive rates of HBVsAg, HBsAb, and HBeAg at birth and at 12 months were not statistically noticeable (p > 0.05). Conclusion: Tenofovir disoproxil and telbivudine reduce HBV-DNA levels, effectively blocks MTCT, and have a similar safety profile for infants. Further investigations to confirm th

Published
2022

23. Triple exponentially weighted moving average control charts without or with variable sampling interval for monitoring the coefficient of variation.

Author

Hu, XueLong, Zhang, SuYing, Xie, FuPeng, and Song, Zhi

Subjects
*QUALITY control charts, *MOVING average process, *MONTE Carlo method
Abstract

The coefficient of variation (CV) chart is widely used in the process where the standard deviation is proportional to the mean. In this work, two separate one-sided triple exponentially weighted moving average control charts are proposed to monitor the CV squared (denoted as TEWMA- $ {\mathrm{\gamma }^2} $ γ 2 chart). By adding the variable sampling interval (VSI) feature to the proposed - $ {\mathrm{\gamma }^2} $ γ 2 charts, the VSI TEWMA- $ {\mathrm{\gamma }^2} $ γ 2 charts are further proposed to improve the performance of the TEWMA- $ {\mathrm{\gamma }^2} $ γ 2 charts. Through extensive Monte Carlo simulations, the zero-state and steady-state run length (RL) performances are presented. The comparisons with the existing CV charts, based on several run length metrics show the superiority of the proposed charts, especially for small shifts. Moreover, the overall measure, expected ARL (EARL), also shows the outperformance of the $ {\mathrm{\gamma }^2} $ γ 2 charts. In addition, based on the average time to signal (ATS) and adjusted ATS (AATS), it is shown that the VSI strategy makes the TEWMA- $ {\mathrm{\gamma }^2} $ γ 2 charts detect the shifts more quickly. An illustrative example from the sintering process is finally provided to display the application of the proposed charts. [ABSTRACT FROM AUTHOR]

Published
2024
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29. Evolution of Physicochemical Structure of Waste Cotton Fiber (Hydrochar) During Hydrothermal Carbonation

Author

Yan Zhifeng, Hou Wensheng, Zhang Suying, Shi Sheng, and Zhang Meiling

Subjects
Materials science, Chemical technology, Carbonation, physicochemical characteristics, TP1-1185, 02 engineering and technology, recycling, 010402 general chemistry, 021001 nanoscience & nanotechnology, carbon microsphere, 01 natural sciences, Hydrothermal circulation, 0104 chemical sciences, waste cotton fibers, Chemical engineering, General Materials Science, Fiber, 0210 nano-technology
Abstract

To study the hydrothermal behavior of cotton fiber, the carbonization process and structural evolution of discarded or waste cotton fiber (WCF) under hydrothermal conditions were investigated using microcrystalline cellulose (MCC), and glucose was used as a model compound. Results showed that high temperature was beneficial for the hydrolysis of discarded cotton fiber, and the yield of sugar was 4.5%, which was lower than that of MCC (6.51%). WCF and MCC were carbonized at 240–~260°C and 220–~240°C, respectively, whereas the carbonization temperature of glucose was lower than 220°C. The C/O ratios of WCF and glucose hydrothermal products were 5.79 and 5.85, respectively. The three kinds of hydrothermal carbonization products had similar crystal structures and oxygen-containing functional groups. The carbonized products of WCF contained many irregular particles, while the main products of glucose carbonization were 0.5-mm-sized carbon microspheres (CMSs). Results showed that glucose was an important intermediate in WCF carbonization and that there were two main pathways of hydrothermal carbonization of cotton fibers: some cotton fibers were completely hydrolyzed into glucose accompanied by nucleation and then the growth of CMSs. For the other part, the glucose ring of the oligosaccharide, formed by the incomplete hydrolysis of cotton fibers under hydrothermal conditions of high temperature and pressure, breaks and then forms particulate matter.

Published
2020

41. Infrared High-Index Coating Materials, PbTe and Pb1−xGexTe: Properties and Applications

Author

Li, Bin, Xie, Ping, Zhang, Suying, Liu, Dingquan, Li, Bin, Xie, Ping, Zhang, Suying, and Liu, Dingquan

Abstract

The greater value of refractive index for high-index layers in thin-film interference filters operating in the infrared has an incomparable advantage. Lead telluride (PbTe), which is much superior to other infrared high-index coating materials due to its high index and advantage of fundamental absorption edges, has played an important role in filters employed in the infrared radiometer and other instruments launched in space atmosphere sounding research projects. In this chapter, we summarized some recent achievements in the investigations into another infrared high-index coating material—lead germanium telluride (Pb1−xGexTe), a pseudo-binary alloy of PbTe and GeTe. It can be revealed that the layers of Pb1−xGexTe exhibit the tunable optical properties, such as temperature coefficient of refractive index and fundamental absorption edge, as well as mechanical properties, such as the hardness and Young’s modulus, corresponding to its intrinsic ferroelectric phase transition. Some important applications in thin-film interference filters were also demonstrated for its tremendous potential, such as a stable narrow bandpass interference filter without temperature-induced wavelength shift and a tunable infrared short wavelength cutoff filter. Furthermore, it is also revealed that electron beam evaporation is a more effective congruent-transfer technique to deposit the layers of Pb1−xGexTe.

Published
2018
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42. Evolution of Waster Cotton Fiber Hydro-Char Physicochemical Structure during Hydrothermal Carbonation

Author

Shi Sheng, Yan Zhifeng, Zhang Meiling, Zhang Suying, and Hou Wensheng

Subjects
chemical_engineering, Materials science, Waste management, Carbonation, Fiber, Char, Hydrothermal circulation
Abstract

In order to study the hydrothermal behavior of cotton fiber, the carbonization process and structural evolution of discarded cotton fiber (WCF) under hydrothermal conditions were discussed use microcrystalline cellulose (MCC) and glucose as model compounds. The results showed that high temperature was beneficial to the hydrolysis of discarded cotton fiber, and the yield of the sugar was 4.5% which was lower than that of MCC 6.51%. WFC and MCC are carbonized in 240~260 ℃ and 220~240 ℃ respectively, while the carbonation temperature of glucose is lower than 220 ℃. The quality ratio of C/O in WCF and glucose hydrothermal products is 5.79 and 5.85 respectively; three kinds of hydrothermal carbonization products have similar crystal structure and oxygen-containing functional groups, and the WCF carbonization products contain a lot of irregular particles while the main products of glucose carbonization are 0.5 μm carbon microspheres (CMCC). The results show that glucose is an important intermediate product of WCF hydrolysis carbonation, and there are two main paths of cotton fiber hydrothermal carbonization: some cotton fibers are completely hydrolyzed into glucose and the nucleation is formed, and then the carbon microspheres are grown; for the other part, the glucose ring of the polysaccharide oligosaccharide formed by the incomplete hydrolysis of cotton fiber in the hydrothermal environment of high temperature and pressure breaks, then forms the particulate matters.

Published
2017

48. Permanent Magnet Synchronous Motor Direct Torque Control Based on Stator Resistance Online Estimation

Author

Liu Huixian, Zhang Suying, Zhao Peidi, Du Xue, and Jin Ji

Subjects
Vector control, Automatic control, Computer science, Stator, Motor control, General Medicine, Physics::Classical Physics, law.invention, Quantitative Biology::Subcellular Processes, Direct torque control, law, Control theory, Torque ripple, Synchronous motor, MATLAB, computer, computer.programming_language
Abstract

Permanent magnet synchronous motor direct torque control system is characterized by its fast, automatic control and so on. Based on the actual value and reference value of the motor control system, this article analysis the effect of the stator resistance variation on the performance of the system.A method to track stator resistance variation is proposed according to the effect of stator resistance deviation on stator flux and current vector.Based on the optimal reference value of the stator current vector, the stator resistance value is estimated on-line by using the angle between the electromagnetic torque and the stator flux; and the simulation studies results using Matlab/Simulink shows that the control method is very effective to improve the low-speed performance of the system, reduced torque ripple and improve system robustness.

Published
2017

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