Jingjing Sun

Inner Mongolia University

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Huikai Xie

Beijing Institute of Technology

Qiong-Hua Jin

Capital Normal University

Lei Wu

Anhui Medical University

Zhuangqi Cao

Shanghai Jiao Tong University

Qi–Ming Qiu

Aviation Industry Corporation of China (China)

Wenjiang Ye

Hebei University of Technology

Minglei Cai

Wuhan National Laboratory for Optoelectronics

Keming Wu

Xidian University

Xianping Wang

Chongqing University of Arts and Sciences

Cheng Yin

Hohai University

Cooperative Institutions

Chinese Academy of Sciences

University of Science and Technology of China

Shanghai Jiao Tong University

Zhejiang University

Sichuan University

Tsinghua University

Chinese Academy of Medical Sciences & Peking Union Medical College

Huazhong University of Science and Technology

Tianjin University

University of Chinese Academy of Sciences

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3D In Vivo optical coherence tomography based on a low-voltage, large-scan-range 2D MEMS mirror

Optics Express (2010)

Jingjing Sun Shuguang Guo Lei Wu Lin Liu Se‐woon Choe

3D in vivo optical imaging on a mouse has been obtained using a 2D MEMS mirror for lateral scanning in a time-domain optical coherence tomography (OCT) system. The MEMS mirror aperture size is 1 x 1 mm(2), and the device footprint is 2 x 2 mm(2). The MEMS mirror scans +/- 30 degrees optical angles about both x and y-axis at only 5.5V DC voltage. An endoscopic probe with an outer diameter of 5.8 mm has been designed, manufactured and packaged. The probe scans an average transverse area of 2 mm x 2 mm. The imaging speed of the probe is about 2.5 frames per second, limited by the speed of the employed optical delay line.

Aperture (computer memory)

10.1364/oe.18.012065

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Citations (147)

Systematical study on the roles of transition alloying substitutions on anti-disproportionation reaction of ZrCo during charging and releasing hydrogen

International Journal of Hydrogen Energy (2020)

Yu-Wei You Jiangying Yu Hui Yuan Yichun Xu Xuebang Wu

10.1016/j.ijhydene.2020.03.107

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Citations (15)

Parametric and empirical spectral analysis for non-invasive diagnosis of basal cell carcinoma

Jingjing Sun Narasimhan Rajaram Tianyi Wang Xianpei Wang Michael R. Migden

We compare parametric and empirical principle component analysis approaches to analyze diffuse reflectance spectra for the diagnosis of basal cell carcinoma and show that both approaches achieve comparable sensitivity and specificity of about 90%.

10.1364/biomed.2010.btud91

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Citations (0)

CCDC 657750: Experimental Crystal Structure Determination

The Cambridge Structural Database (2007)

Meng Gao Jingjing Sun

An entry from the Cambridge Structural Database, the world’s repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely available from the CCDC and typically includes 3D coordinates, cell parameters, space group, experimental conditions and quality measures.

10.5517/ccq2fry

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Simultaneous measurement of electro-optical and converse-piezoelectric coefficients of PMN-PT ceramics

Optics Express (2012)

Pingping Xiao Xianping Wang Jingjing Sun Meizhen Huang Xianfeng Chen

A new scheme is proposed to measure the electro-optical (EO) and converse-piezoelectric (CPE) coefficients of the PMN-PT ceramics simultaneously, in which the PMN-PT ceramics acts as the guiding layer of a symmetrical metal-cladding waveguide. As the applied electric field exerts on the waveguide, the effective refractive index (RI) (or synchronous angle) can be effectively tuned from a selected mode to another adjacent mode owing to the high sensitivity and the small spacing of the ultra-high order modes. Subsequently, a correlation between EO and CPE coefficients is established. With this correlation and the measurement of the effective RI change to the applied voltage, the quadratic EO and CPE coefficients of PMN-PT ceramics are obtained simultaneously. The obtained results are further checked by fitting the variations of effective RI to a quadratic function. Our measurement method can be extended to a wide range of other materials.

Cladding (metalworking)

10.1364/oe.20.013833

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Citations (9)

Probe alignment and design issues of microelectromechanical system based optical coherence tomography endoscopic imaging

Applied Optics (2013)

Can Duan Jingjing Sun Sean R. Samuelson Huikai Xie

Endoscopic optical coherence tomography (OCT) imaging has been demonstrated using microelectromechanical system (MEMS) technology by several research groups. The focus of this work is to study how the OCT imaging performance is affected by the radius of curvature of MEMS mirrors as well as the optical alignment accuracy inside small imaging probes. The goal of this study is to provide guidance for assembly tolerance and design optimization of OCT endoscopic probes. Gaussian beam propagation is used for theoretical analysis which is confirmed by optical simulation and verified experimentally with a time-domain OCT system as well. It has been found that the OCT imaging is very sensitive to the distance from the fiber end to the gradient-index (GRIN) lens, which needs to be controlled within 0.1 mm to achieve working distance (WD) longer than 3.5 mm and lateral resolution around 25 μm. The impact on image quality of the MEMS mirror is negligible if the radius of curvature of the mirror surface is greater than 200 mm. In addition, we studied the astigmatism introduced by cylindrical plastic tubing; the maximum astigmatism ratio is 1.1 when the WD is around 2.5 mm.

Gradient-index optics

Gaussian beam

Radius of curvature

10.1364/ao.52.006589

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Citations (16)

Dielectric and infrared properties of silicon carbide nanopowders

Ceramics International (2002)

Jingjing Sun Jianbao Li Geliang Sun Bo Zhang Shuxia Zhang

Dissipation factor

Dielectric loss

10.1016/s0272-8842(02)00037-8

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Citations (34)

Fabric wrinkle characterization and classification using modified wavelet coefficients and support-vector-machine classifiers

Textile Research Journal (2011)

Jingjing Sun Ming Yao Bugao Xu Patricia Damian Bel

In this paper we present a novel wrinkle evaluation method that uses modified wavelet coefficients and optimized support-vector-machine (SVM) classifications to characterize and classify the wrinkling appearance of fabric. Fabric images were decomposed with the wavelet transform, and five parameters were defined, based on the modified wavelet coefficients, to describe wrinkling features, such as orientation, hardness, density, and contrast. These parameters were also used as the inputs of optimized SVM classifiers to obtain overall wrinkle grading in accordance with the standard American Association of Textile Chemists and Colorists smoothness appearance (SA) replicas. The SVM classifiers, based on a linear kernel and a radial-basis-function kernel, were used in the study. The effectiveness of this evaluation method was tested by 300 images of five selected fabrics that had different fiber contents, weave structures, colors, and laundering cycles. The cross-validation tests on the SA classifications indicated that the SA grades of more than 75% of these diversified samples could be recognized correctly. The extracted wrinkle parameters provided useful information for textile, appliance, and detergent manufactures to inspect wrinkling behaviors of fabrics.

Wrinkle

Kernel (algebra)

Textile

10.1177/0040517510391702

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Citations (58)

Optically based‐indentation technique for acute rat brain tissue slices and thin biomaterials

Journal of Biomedical Materials Research Part B Applied Biomaterials (2011)

Shin‐Jae Lee Jingjing Sun Jeremy J. Flint Shu Guo Huikai Xie

Abstract Currently, micro‐indentation testing of soft biological materials is limited in its capability to test over long time scales due to accumulated instrumental drift errors. As a result, there is a paucity of measures for mechanical properties such as the equilibrium modulus. In this study, indentation combined with optical coherence tomography (OCT) was used for mechanical testing of thin tissue slices. OCT was used to measure the surface deformation profiles after placing spherical beads onto submerged test samples. Agarose‐based hydrogels at low‐concentrations (w/v, 0.3–0.6%) and acute rat brain tissue slices were tested using this technique over a 30‐min time window. To establish that tissue slices maintained cell viability, allowable testing times were determined by measuring neuronal death or degeneration as a function of incubation time with Fluor‐Jade C (FJC) staining. Since large deformations at equilibrium were measured, displacements of surface beads were compared with finite element elastic contact simulations to predict the equilibrium modulus, μ ∞ . Values of μ ∞ for the low‐concentration hydrogels ranged from 0.07 to 1.8 kPa, and μ ∞ for acute rat brain tissue slices was 0.13 ± 0.04 kPa for the cortex and 0.09 ± 0.015 kPa for the hippocampus (for Poisson ratio = 0.35). This indentation technique offers a localized, real‐time, and high resolution method for long‐time scale mechanical testing of very soft materials. This test method may also be adapted for viscoelasticity, for testing of different tissues and biomaterials, and for analyzing changes in internal structures with loading. © 2011 Wiley Periodicals, Inc. J Biomed Mater Res Part B: Appl Biomater, 2011.

Indentation

Agarose

Brain tissue

10.1002/jbm.b.31789

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Citations (34)

Hydrogen bubble nucleation by self-clustering: density functional theory and statistical model studies using tungsten as a model system

Nuclear Fusion (2018)

Jie Hou Xiang-Shan Kong Jingjing Sun Yu-Wei You Xuebang Wu

Low-energy hydrogen irradiation is known to induce bubble formation in tungsten, while its atomistic mechanisms remain little understood. Using first-principles calculations and statistical models, we studied the self-clustering behavior of hydrogen in tungsten. Unlike previous speculations that hydrogen self-clusters are energetically unstable owing to the general repulsion between two hydrogens, we demonstrated that hydrogen self-cluster becomes more favorable as the cluster size increases. We found that hydrogen atoms would form two-dimensional platelet-like structures along {100} planes. These hydrogen self-clustering behaviors can be quantitative understood by the competition between long-ranged elastic attraction and local electronic repulsion. Further statistical analysis showed that there exists a critical hydrogen concentration above which hydrogen self-clusters are thermodynamically stable and kinetically feasible. Based on this critical hydrogen concentration, the plasma loading conditions under which hydrogen self-clusters form were predicted. Our predictions showed excellent agreement with experimental results of hydrogen bubble formation in tungsten exposed to low-energy hydrogen irradiation. Finally, we proposed a possible mechanism for the hydrogen bubble nucleation via hydrogen self-clustering. This work provides mechanistic insights and quantitative models towards understanding of plasma-induced hydrogen bubble formation in plasma-facing tungsten.

10.1088/1741-4326/aacdb6

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Citations (41)