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21 results on '"Wang, Haoshen"'

1. 3D MedDiffusion: A 3D Medical Diffusion Model for Controllable and High-quality Medical Image Generation

Author

Wang, Haoshen, Liu, Zhentao, Sun, Kaicong, Wang, Xiaodong, Shen, Dinggang, and Cui, Zhiming

Subjects
Electrical Engineering and Systems Science - Image and Video Processing, Computer Science - Computer Vision and Pattern Recognition
Abstract

The generation of medical images presents significant challenges due to their high-resolution and three-dimensional nature. Existing methods often yield suboptimal performance in generating high-quality 3D medical images, and there is currently no universal generative framework for medical imaging. In this paper, we introduce the 3D Medical Diffusion (3D MedDiffusion) model for controllable, high-quality 3D medical image generation. 3D MedDiffusion incorporates a novel, highly efficient Patch-Volume Autoencoder that compresses medical images into latent space through patch-wise encoding and recovers back into image space through volume-wise decoding. Additionally, we design a new noise estimator to capture both local details and global structure information during diffusion denoising process. 3D MedDiffusion can generate fine-detailed, high-resolution images (up to 512x512x512) and effectively adapt to various downstream tasks as it is trained on large-scale datasets covering CT and MRI modalities and different anatomical regions (from head to leg). Experimental results demonstrate that 3D MedDiffusion surpasses state-of-the-art methods in generative quality and exhibits strong generalizability across tasks such as sparse-view CT reconstruction, fast MRI reconstruction, and data augmentation.

Published
2024

2. Structure-Preserving Diffusion Model for Unpaired Medical Image Translation

Author

Wang, Haoshen, Wang, Xiaodong, Cui, Zhiming, Goos, Gerhard, Series Editor, Hartmanis, Juris, Founding Editor, Bertino, Elisa, Editorial Board Member, Gao, Wen, Editorial Board Member, Steffen, Bernhard, Editorial Board Member, Yung, Moti, Editorial Board Member, Xu, Xuanang, editor, Cui, Zhiming, editor, Rekik, Islem, editor, Ouyang, Xi, editor, and Sun, Kaicong, editor

Published
2025
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15. Boosted Photocatalytic Performance for Antibiotics Removal with Ag/PW 12 /TiO 2 Composite: Degradation Pathways and Toxicity Assessment.

Author

Shi, Hongfei, Wang, Haoshen, Zhang, Enji, Qu, Xiaoshu, Li, Jianping, Zhao, Sisi, Gao, Huajing, and Chen, Zhe

Subjects
*STRUCTURE-activity relationships, *HETEROJUNCTIONS, *PHOTOCATALYSTS, *CATALYTIC activity, *QUANTUM efficiency, *ANTIBIOTICS, *ENVIRONMENTAL remediation, *SILVER phosphates
Abstract

Photocatalyst is the core of photocatalysis and directly determines photocatalytic performance. However, low quantum efficiency and low utilization of solar energy are important technical problems in the application of photocatalysis. In this work, a series of polyoxometalates (POMs) [H3PW12O40] (PW12)-doped titanium dioxide (TiO2) nanofibers modified with various amount of silver (Ag) nanoparticles (NPs) were prepared by utilizing electrospinning/photoreduction strategy, and were labelled as x wt% Ag/PW12/TiO2 (abbr. x% Ag/PT, x = 5, 10, and 15, respectively). The as-prepared materials were characterized with a series of techniques and exhibited remarkable catalytic activities for visible-light degradation tetracycline (TC), enrofloxacin (ENR), and methyl orange (MO). Particularly, the 10% Ag/PT catalyst with a specific surface area of 155.09 m2/g and an average aperture of 4.61 nm possessed the optimal photodegradation performance, with efficiencies reaching 78.19% for TC, 93.65% for ENR, and 99.29% for MO, which were significantly higher than those of PW12-free Ag/TiO2 and PT nanofibers. Additionally, various parameters (the pH of the solution, catalyst usage, and TC concentration) influencing the degradation process were investigated in detail. The optimal conditions are as follows: catalyst usage: 20 mg; TC: 20 mL of 20 ppm; pH = 7. Furthermore, the photodegradation intermediates and pathways were demonstrated by HPLC-MS measurement. We also investigated the toxicity of products generated during TC removal by employing quantitative structure-activity relationship (QSAR) prediction through a toxicity estimation software tool (T.E.S.T. Version 5.1.2.). The mechanism study showed that the doping of PW12 and the modification of Ag NPs on TiO2 broadened the visible-light absorption, accelerating the effective separation of photogenerated carriers, therefore resulting in an enhanced photocatalytic performance. The research provided some new thoughts for exploiting efficient and durable photocatalysts for environmental remediation. [ABSTRACT FROM AUTHOR]

Published
2023
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16. Assembly-induced microwave band resonance in gold nanoparticles-based ultrathin and flexible spoof localized surface plasmon

Author

Ning Gu, Xiaopeng Shen, Wang Haoshen, Qing Jiang, Peng Wang, Ou Xu, Jianfei Sun, Siyu Ma, Peihang He, Hao Chi Zhang, and Zhaobin Guo

Subjects
Materials science, Optical/microwave dual bands, Nanophotonics, Nanoparticle, 02 engineering and technology, 010402 general chemistry, 01 natural sciences, Microwave band, Spoof LSP, Gold nanoparticles, General Materials Science, Materials of engineering and construction. Mechanics of materials, Layer-by-layer assembly, business.industry, Mechanical Engineering, Resonance, Metamaterial, 021001 nanoscience & nanotechnology, Flexible electronics, 0104 chemical sciences, Mechanics of Materials, Colloidal gold, TA401-492, Optoelectronics, 0210 nano-technology, business, Localized surface plasmon
Abstract

Spoof LSP (Localized Surface Plasmon) is a great advance in metamaterials, expanding the LSP resonance from optical band into microwave band. It will yield amazing outcomes by integration with flexible electronics, wearable electronics and nanophotonics. Here, an ultrathin and flexible spoof LSP prepeared by layer-by-layer (LBL) assembly of gold nanoparticles was demonstrated. The LSPR effects in microwave band was assembly-induced and the electric resonance component disappeared, which is significantly different from that of the spoof LSPs by bulk metal. It was thought and proved by simulation to be relative with the special micro-structure of the gold nanoparticle assemblies. Furthermore, the spoof LSP by gold nanoparticles was flexible and showed a strong relationship between the resonance frequency and the curvature degree of the spoof LSP, meaning that the LSP resonance can be modulated by the deformation of the spoof LSP. We believed that these results could deepen understanding about the spoof LSPs and widen the application in multiple areas.

Published
2021

17. Polarization insensitive wide-angle triple-band metamaterial bandpass filter

Author

Wang Haoshen, Xiaopeng Shen, Fu Wenyue, and Li Jiandong

Subjects
Physics, Terahertz radiation, business.industry, Physics::Optics, Metamaterial, 020206 networking & telecommunications, 02 engineering and technology, Radome, Polarization (waves), law.invention, Split-ring resonator, Optics, Band-pass filter, law, 0202 electrical engineering, electronic engineering, information engineering, Metamaterial absorber, business, Microwave
Abstract

Metamaterials have attracted tremendous amount of interests owing to their tempting electromagnetic responses. Based on the metamaterials, many novel practical electromagnetic devices have been realized in the microwave, terahertz, and optical frequencies. Recently, a new type of metamaterial filter has attracted growing attention. Based on the method of hybrid multiple resonances, the metamaterial filter possesses a notable spectral-filtering capability with broad bandwidth and excellent band-edge transitions. In this letter, we report the design, fabrication, and measurement of a polarization insensitive wide-angle triple-band metamaterial bandpass filter (BPF) in the microwave frequency. The proposed BPF consists of two identical metal resonant units which have three concentric square slots separated by a dielectric layer. Experimental results show that the BPF has three distinctive transmission bands centered at frequencies 6.22 GHz, 9.46 GHz and 12.14 GHz with transmission rates of −0.40 dB, −0.71 dB and −1.40 dB, respectively, agreeing well with simulation results. By introducing the substrate integrated waveguide (SIW), it is shown that the filter is valid to a wide range of incident angles for both transverse electric (TE) and transverse magnetic (TM) polarizations. The triple-band metamaterial BPF is a promising candidate as new filters and radomes owing to its multiband transmissions, polarizations insensitive, and wide-angle responses.

Published
2016
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20. Polarization insensitive wide-angle triple-band metamaterial bandpass filter

Author

Haipeng Li, Tie Jun Cui, Kui Han, Wang Haoshen, Li Jiandong, Xiaopeng Shen, Yuchen Han, and Fu Wenyue

Subjects
Materials science, Fabrication, Acoustics and Ultrasonics, business.industry, Metamaterial, 02 engineering and technology, Radome, Concentric, 021001 nanoscience & nanotechnology, Condensed Matter Physics, Polarization (waves), 01 natural sciences, Surfaces, Coatings and Films, Electronic, Optical and Magnetic Materials, law.invention, 010309 optics, Transverse magnetic, Transverse plane, Optics, Band-pass filter, law, 0103 physical sciences, 0210 nano-technology, business
Abstract

In this letter, we report the design, fabrication and measurement of a polarization insensitive wide-angle triple-band metamaterial bandpass filter (BPF) in the microwave frequency. The proposed BPF consists of two identical metal resonant units which have three concentric square slots separated by a dielectric layer. Experimental results show that the BPF has three distinctive transmission bands centered at frequencies 6.22 GHz, 9.46 GHz and 12.14 GHz with transmission rates of −0.40 dB, −0.71 dB and −1.40 dB, respectively, agreeing well with simulation results. By introducing the substrate integrated waveguide, the filter is valid to a wide range of incident angles for both transverse electric and transverse magnetic polarizations. The triple-band metamaterial BPF can be used as multiband filters and radomes owing to its multiband transmissions, polarizations insensitive and wide-angle responses.

Published
2016
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21. NiCoP as a cocatalyst decorating CdIn2S4 for enhanced photocatalytic performance under visible light: DFT calculation and mechanism insight.

Author

Shi, Hongfei, Zhang, Enji, Zhu, Hongwei, Wang, Haoshen, Rong, Ao, and Mao, Liang

Subjects
*VISIBLE spectra, *IRRADIATION, *X-ray photoelectron spectroscopy, *CHARGE exchange, *DENSITY functional theory, *PHOTOCATALYSTS, *QUANTUM efficiency, *PHOTOCATALYSIS
Abstract

Solar photocatalysis, a green and sustainable technology, can effectively address the global energy shortage and environmental pollution. Herein, CdIn 2 S 4 (CIS) microflowers and NiCoP (NCP) nanoparticles were prepared by hydrothermal synthesis and vacuum calcination, respectively. Subsequently, novel NiCoP/CdIn 2 S 4 (abbreviated x wt % NCP/CIS; x = 7, 9, 11, 13, and 15) composite photocatalysts were synthesized using an impregnation method. The as-obtained NCP/CIS catalysts exhibited excellent photocatalytic activities for hydrogen production and Cr(VI) reduction with high cycling stability under visible light (λ > 420 nm). The H 2 production rate of the optimal 11% NCP/CIS sample was 651.67 μmol g−1 h−1, which was approximately 25.92 times higher than that of individual CIS (25.14 μmol g−1 h−1). The apparent quantum efficiency at 420 nm reached 3.31%. The rate constant of photocatalytic Cr(VI) reduction reached 0.036 min−1, 2.77 and 11.19 times that of CIS (0.013 min−1) and NCP (0.0032 min−1), respectively. The enhanced photocatalytic properties of NCP/CIS are attributed to the improved visible-light absorption and efficient separation of photoinduced carriers. Furthermore, free radical capturing tests and ESR data proved that e− and ·O 2 − were responsible for Cr(VI) reduction. The electron transfer pathway and photocatalytic mechanism were verified using X-ray photoelectron spectroscopy, density functional theory calculations, and energy band structures. This study provides novel approaches for designing and preparing non-noble metal cocatalyst/semiconductor systems with remarkably efficient photocatalytic performance for Cr(VI) removal and H 2 generation. A novel type of NiCoP/CdIn 2 S 4 composite was successfully fabricated via an impregnation method, which showed excellent and persistent visible-light catalytic performance for H 2 production and Cr(VI) reduction. The influence factors on Cr(VI) reduction were comprehensively investigated. The electron transfer pathway and photocatalytic mechanism were verified using XPS, DFT calculations and energy band structures. [Display omitted] • NiCoP as a cost-effective cocatalyst for modifying CdIn 2 S 4. • NCP/CIS showed significantly enhanced visible-light photocatalytic activity. • 11% NCP/CIS presented the optimal H 2 -evolution rate of 651.67 μmol g−1 h−1. • The influence of operating parameters on Cr(VI) reduction was investigated. • Electron transfer path and catalytic mechanism were verified by XPS and DFT. [ABSTRACT FROM AUTHOR]

Published
2024
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