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430 results on '"Yang, Yongming"'

61. Simulation and experiment of ultrasonic-assisted grinding process for natural diamond.

Author

PEI Leigang, SHI Guangfeng, CHEN Jiazeng, YAO Dong, YANG Yongming, and LI Junye

Subjects
CRYSTAL surfaces, DIAMONDS, ULTRASONIC effects, INELASTIC collisions, SURFACE roughness
Abstract

To improve the surface quality of natural diamond grinding, the ultrasonic vibration was introduced for composite grinding, and an inelastic collision theory model was established to calculate the amplitude of ultrasonic vibration. The effects of ultrasonic amplitude, grinding speed and grinding grain size on the material removal of natural diamond (100) crystal surface were studied, and the optimal process parameters were sought. The results show that the ultrasonic amplitude ranges from 3.1 to 8.7 µm in the direction of easy grinding of natural diamond (110) crystal surface and 2.9 to 9.1 µm in the direction of easy grinding of natural diamond (100) crystal surface. The optimal process combination parameters of natural diamond (100) crystal surface grinding obtained by orthogonal experiment are ultrasonic amplitude of 6.0 µm, grinding disk speed of 2 800 r/min, diamond grinding grain size code of M3/6. The surface roughness Ra of diamond (100) crystal surface after ultrasonic assisted grinding is 16.21 nm, which is 63.83% lower than that of traditional mechanical grinding. Ultrasonic assisted grinding of natural diamonds can achieve better surface quality than traditional mechanical grinding. [ABSTRACT FROM AUTHOR]

Published
2023
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62. Brazilin inhibits bladder cancer by promoting cell necroptosis.

Author

Yang, Xihua, Zhang, Shuaina, He, Jiao, Zhao, Lili, Chen, Lixia, Yang, Yongming, Wang, Jing, Yan, Lei, and Zhang, Tingting

Subjects
BLADDER cancer, MEMBRANE potential, CANCER cells, CELL culture, WESTERN immunoblotting, CELL death
Abstract

Brazilin possesses anticancer effects, but the mechanisms are poorly understood. This study investigated the mechanisms of brazilin‐induced cell death in the T24 human bladder cancer cell line. Low serum cell culture and the lactate dehydrogenase assay were used to confirm the antitumor effect of brazilin. Annexin V and propidium iodide double staining, transmission electron microscopy, fluo‐3‐AM assay for Ca2+ mobilization and caspase activity assay were performed to identify the type of cell death after brazilin treatment. Mitochondria membrane potentials were measured using JC‐1. Quantitative real‐time polymerase chain reaction and western blot analyses were performed to verify the expression of the necroptosis‐related genes and proteins receptor interacting protein 1 (RIP1), RIP3 and mixed lineage kinase domain‐like (MLKL). The results showed that brazilin induced necrosis in T24 cells and upregulated the mRNA and protein levels of RIP1, RIP3 and MLKL and Ca2+ influx. The necroptosis‐mediated cell death was rescued by the necroptosis inhibitor necrostatin‐1 (Nec‐1), but not by the apoptosis inhibitor z‐VAD‐fmk. Brazilin repressed caspase 8 expression and decreased the mitochondrial membrane potentials; both effects were partially reversed by Nec‐1. Brazilin induced physiological and morphological changes in T24 cells and RIP1/RIP3/MLKL‐mediated necroptosis might be involved. In conclusion, the results confirm the involvement of necroptosis in brazilin‐induced cell death and suggest that brazilin could be explored as an anticancer agent against bladder cancer. [ABSTRACT FROM AUTHOR]

Published
2023
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73. Multiple Factors Based Evaluation of Fingerprint Images Quality

Author

Yang, Yongming, Zhang, Zulong, Han, Fengling, Lin, Kunming, Hutchison, David, Editorial Board Member, Kanade, Takeo, Editorial Board Member, Kittler, Josef, Editorial Board Member, Kleinberg, Jon M., Editorial Board Member, Mattern, Friedemann, Editorial Board Member, Mitchell, John C., Editorial Board Member, Naor, Moni, Editorial Board Member, Nierstrasz, Oscar, Editorial Board Member, Pandu Rangan, C., Editorial Board Member, Steffen, Bernhard, Editorial Board Member, Sudan, Madhu, Editorial Board Member, Terzopoulos, Demetri, Editorial Board Member, Tygar, Doug, Editorial Board Member, Vardi, Moshe Y., Editorial Board Member, Weikum, Gerhard, Editorial Board Member, Xiang, Yang, editor, Lopez, Javier, editor, Kuo, C.-C. Jay, editor, and Zhou, Wanlei, editor

Published
2012
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74. Feature Level Fusion of Fingerprint and Finger Vein Biometrics

Author

Lin, Kunming, Han, Fengling, Yang, Yongming, Zhang, Zulong, Hutchison, David, Series editor, Kanade, Takeo, Series editor, Kittler, Josef, Series editor, Kleinberg, Jon M., Series editor, Mattern, Friedemann, Series editor, Mitchell, John C., Series editor, Naor, Moni, Series editor, Nierstrasz, Oscar, Series editor, Pandu Rangan, C., Series editor, Steffen, Bernhard, Series editor, Sudan, Madhu, Series editor, Terzopoulos, Demetri, Series editor, Tygar, Doug, Series editor, Vardi, Moshe Y., Series editor, Weikum, Gerhard, Series editor, Tan, Ying, editor, Shi, Yuhui, editor, Chai, Yi, editor, and Wang, Guoyin, editor

Published
2011
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77. Adapting ADDIE Model for Human Robot Interaction in Soccer Robotics Domain

Author

Mohan, Rajesh Elara, Calderon, Carlos A. Acosta, Zhou, Changjiu, Yang, Tianwu, Zhang, Liandong, Yang, Yongming, Hutchison, David, Series editor, Kanade, Takeo, Series editor, Kittler, Josef, Series editor, Kleinberg, Jon M., Series editor, Mattern, Friedemann, Series editor, Mitchell, John C., Series editor, Naor, Moni, Series editor, Nierstrasz, Oscar, Series editor, Pandu Rangan, C., Series editor, Steffen, Bernhard, Series editor, Sudan, Madhu, Series editor, Terzopoulos, Demetri, Series editor, Tygar, Doug, Series editor, Vardi, Moshe Y., Series editor, Weikum, Gerhard, Series editor, Goebel, Randy, editor, Siekmann, Jörg, editor, Wahlster, Wolfgang, editor, Iocchi, Luca, editor, Matsubara, Hitoshi, editor, Weitzenfeld, Alfredo, editor, and Zhou, Changjiu, editor

Published
2009
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79. A Hybrid Knowledge-Based Neural-Fuzzy Network Model with Application to Alloy Property Prediction

Author

Chen, Min-You, Wang, Quandi, Yang, Yongming, Hutchison, David, Series editor, Kanade, Takeo, Series editor, Kittler, Josef, Series editor, Kleinberg, Jon M., Series editor, Mattern, Friedemann, Series editor, Mitchell, John C., Series editor, Naor, Moni, Series editor, Nierstrasz, Oscar, Series editor, Pandu Rangan, C., Series editor, Steffen, Bernhard, Series editor, Sudan, Madhu, Series editor, Terzopoulos, Demetri, Series editor, Tygar, Doug, Series editor, Vardi, Moshe Y., Series editor, Weikum, Gerhard, Series editor, Liu, Derong, editor, Fei, Shumin, editor, Hou, Zeng-Guang, editor, Zhang, Huaguang, editor, and Sun, Changyin, editor

Published
2007
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80. Fast and Efficient Basis Selection Methods for Embedded Wavelet Packet Image Coding

Author

Yang, Yongming, Xu, Chao, Hutchison, David, editor, Kanade, Takeo, editor, Kittler, Josef, editor, Kleinberg, Jon M., editor, Mattern, Friedemann, editor, Mitchell, John C., editor, Naor, Moni, editor, Nierstrasz, Oscar, editor, Pandu Rangan, C., editor, Steffen, Bernhard, editor, Sudan, Madhu, editor, Terzopoulos, Demetri, editor, Tygar, Dough, editor, Vardi, Moshe Y., editor, Weikum, Gerhard, editor, Campilho, Aurélio, editor, and Kamel, Mohamed S., editor

Published
2006
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82. Design Methodology of a Passive Vibration Isolation System for an Optical System With Sensitive Line-of-Sight

Author

Chao Lin, Chao Fang, Keqi Qi, Shaoxin Wang, Ya-lin Ding, Yang Yongming, and Lei Dai

Subjects
Coupling, 0209 industrial biotechnology, Computer science, Acoustics, Payload (computing), Base (geometry), Stiffness, 02 engineering and technology, Decoupling (cosmology), 021001 nanoscience & nanotechnology, Atomic and Molecular Physics, and Optics, Electronic, Optical and Magnetic Materials, Vibration, 020901 industrial engineering & automation, Vibration isolation, medicine, medicine.symptom, 0210 nano-technology, Transmissibility (structural dynamics)
Abstract

The performance of an optical system with sensitive line-of-sight (LOS) is influenced by rotational vibration. In view of this, a design methodology is proposed for a passive vibration isolation system in an optical system with sensitive LOS. Rotational vibration is attributed to two sources: transmitted from the mounting base and generated by modal coupling. Therefore, the elimination of the rotational vibration caused by coupling becomes an important part of the design of the isolation system. Additionally, the decoupling conditions of the system can be obtained. When the system is totally decoupled, the vibration on each degree of freedom (DOF) can be analyzed independently. Therefore, the stiffness and damping coefficient on each DOF could be obtained by limiting the vibration transmissibility, in accordance to actual requirements. The design of a vibration isolation system must be restricted by the size and shape of the payload and the installation space, and the layout constrains are thus also discussed.

Published
2021

84. Evolution laws and mathematical characterization of coal fissure under uniaxial stress.

Author

YANG Yongming, NING Gengping, SUN Rongjian, JIANG Longwen, and ZHU Yanxi

Subjects
COAL, FRACTAL dimensions, HYDRAULIC fracturing, PEAK load, COMPUTED tomography
Abstract

In order to explore the evolution law and mathematical characterization method of natural fissure structure of coal under uniaxial loading, a 3D numerical model was reconstructed based on computed tomography (CT) scanning experiment to accurately describe natural fissure structure, and the uniaxial compression numerical simulation of coal was carried out. The length, opening, fissure degree and fractal dimension were introduced to characterize the spatial morphology of fissure, and the variation of characterization parameters with increasing load was analyzed. The results reveal the evolution characteristics of fissure structure of coal under uniaxial loading. The study shows that the coal is mostly composed of small-scale fissure, and the fissure evolution can be divided into two stages during the loading process. In the first stage, namely the initial stage of loading, the fissure is compacted and closed. Compared with the non loading, the upper limit of fissure length decreases by -1-1%, the fissure degree decreases by 35%, and the fractal dimension decreases by 22%. In the second stage, fissure in the coal begin to develop with the increase of load. At peak load, the length increases by 10% on average, the distribution frequency of the minimum interval of fissure length increases by 12%, and the distribution frequency of the minimum interval of fissure opening increases by 50%. The research results provide a theoretical basis for revealing the laws of coal fissure propagation under loading and effectively implementing hydraulic fracturing technology. [ABSTRACT FROM AUTHOR]

Published
2023

90. Effect of Sampling Force on The Quality of Oropharyngeal Swabs

Author

Liu Hao, Wenliang Guo, Wang Chongyang, Li Shiyue, Tao Yu, Zhou Yuanyuan, Yang Yongming, qian Jiang, chen Hong, and shaoqiang Li

Subjects
Computer science, media_common.quotation_subject, Statistics, Sampling (statistics), Quality (business), media_common
Abstract

Background The aim of this study was to clarify the most suitable sampling force for OP swabs. Methods Thirty healthy subjects were continuously included in this study. The quantitative relationship between sampling force and the quality of OP swabs (CT values of GAPDH in OP swab specimens) has been explored. Results No significant relativities between the median sampling forces and qualities of OP swab were found in this study (r=-0.079, P = 0.547). The median and maximum sampling forces were remarkedly differed from different sampling doctors (P 40 g)of sampling force (P = 0.873). However, it was observed that the incidence of side effects was significantly increased in the middle and high level groups, compared to the low level group (P

Published
2021

95. Mode-locked fiber laser based on Cr2Si2Te6saturable absorber with a Sagnac loop

Author

Yang, Yongming, Li, Haoyuan, Hu, Qiongyu, Zhao, Haoxu, Zhang, Bin, Liu, Jing, Chen, Xiaohan, Zhang, Huanian, and Li, Ping

Abstract

A late-model all-fiber mode-locked laser was introduced in this paper. This pulsed Er-doped fiber laser has a novel Sagnac loop structure and uses the tapered fiber coated with two-dimensional layer ferromagnetic insulator Cr2Si2Te6as a saturable absorber in order to achieve passive mode locking. When the pump power was 167.6 mW, the laser worked at the fundamental repetition frequency of 19.1 MHz with a signal-to-noise ratio of 62.5 dB. The central wavelength of the spectrum was 1561.0 nm, and the maximum output power was 8.9 mW with a minimum pulse width of 5.2 ps. The mutual interference of beams makes the use of the saturable absorber more efficient. The results reveal that this Er-doped fiber laser has great application potential in nonlinear optics and ultrafast photonics.

Published
2023
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