Article
Engineering, Electrical & Electronic
Zhou Cong, Zi He, Da-Zhi Ding
Summary: An efficient electromagnetic scattering analysis method using iterative bidirectional ray tracing has been developed to consider both multiple reflections and scatterings. This method achieves high accuracy in analyzing complex electromagnetic scattering problems.
IEEE ANTENNAS AND WIRELESS PROPAGATION LETTERS
(2022)
Article
Engineering, Multidisciplinary
Xiaoyu Zhu, Md Moinul Hossain, Jian Li, Biao Zhang, Chuanlong Xu
Summary: This study proposes an equivalent ray tracing method for light field particle image velocimetry, enabling the measurement of three-dimensional flow velocity in internal industrial and space-constrained applications. By establishing a mapping relationship between target points and their equivalent points in the air based on a light field snapshot of a smart calibration board, the weight coefficients are calculated using the changed starting points of ray tracing. Experimental results demonstrate accurate reconstruction of spatial locations of the marks and a similar measurement accuracy to the in-situ calibration method.
Article
Nanoscience & Nanotechnology
David Bronte Ciriza, Alessandro Magazzu, Agnese Callegari, Gunther Barbosa, Antonio A. . R. . Neves, Maria Antonia Iati, Giovanni Volpe, Onofrio M. Marago
Summary: Optical forces are commonly calculated using the discretization of trapping light beam into rays. This method has limitations in terms of speed and accuracy. In this research, we show that neural networks can overcome these limitations and provide faster and more accurate simulations. We demonstrate this by studying optically trapped spherical particles and ellipsoidal particles in a double trap using neural networks.
Article
Biochemistry & Molecular Biology
Samuel Coulbourn Flores, Michal Maly, Dominik Hrebik, Pavel Plevka, Jiri Cerny
Summary: The revolution in cryo-electron microscopy has provided unprecedented capabilities in deciphering large macromolecular complexes, including viruses. However, methods for studying nucleic acids lag behind. This study presents a method that utilizes the spiral winding patterns of DNA in viral capsids to quickly generate DNA shells and explain density. The findings suggest rules for DNA turns that determine the capsid inner diameter.
NUCLEIC ACIDS RESEARCH
(2023)
Article
Engineering, Electrical & Electronic
Stephen Kasdorf, Blake Troksa, Cam Key, Jake Harmon, Branislav M. Notaros
Summary: This paper presents improvements to the shooting and bouncing ray (SBR) method for ray-tracing electromagnetic modeling, including per-ray cone angle calculation and analytical expression for optimal cone angle selection. By utilizing different ray generation approaches, the advanced method can achieve the same accuracy in wireless propagation modeling of tunnel environments compared to traditional methods.
IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION
(2021)
Article
Energy & Fuels
Dennis Bredemeier, Carsten Schinke, Raphael Niepelt, Rolf Brendel
Summary: Photovoltaics on building facades offer high energy yield, especially in urban areas. Calculating the PV potential of facade surfaces is challenging due to complex shadowing and reflections. This paper presents a fast ray tracing method for insolation forecasts, allowing for determination of PV capacity factors in different environments.
PROGRESS IN PHOTOVOLTAICS
(2023)
Letter
Materials Science, Characterization & Testing
Huanqing Cao, Shifeng Guo, Shuxiao Zhang, Yinfei Xie, Wei Feng
Summary: This study aims to develop an effective ray tracing method for imaging the corner parts of complex-shaped CFRP structures, and has demonstrated that the method can enhance the signal to noise ratio of TFM images and accurately position internal defects.
NDT & E INTERNATIONAL
(2021)
Article
Thermodynamics
S. M. Hosseini Sarvari
Summary: A novel vectorial discrete ray tracing approach is applied to track the curve paths of radiative beams through variable index media with complex geometries. The irregular solution domain is discretized by a boundary-fitted grid, where radiative properties are considered constant for each control volume and control surface. Radiative beams travel along straight lines through each volume element until they hit interfaces, where refraction direction changes according to Snell's law. The discrete transfer method is used to solve radiation heat transfer in absorbing, emitting, and isotropically scattering media, with verification by comparing results with benchmark solutions in literature and ensuring energy conservation.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2022)
Article
Engineering, Electrical & Electronic
Yuki Mizushima
Summary: This study describes a ray-tracing-assisted method for calibrating a fiber-optic thickness probe for measuring thickness in micrometers in wavy liquid-film flow. The method calibrates the device quickly and efficiently, with superior performance compared to conventional fiber-optic methods. Through investigation of multimode optical fiber properties and validation of the RTA calibration method, the study discusses the applicable thickness range and measurement uncertainty of the FOTP beyond what can be achieved through experiments alone.
IEEE TRANSACTIONS ON INSTRUMENTATION AND MEASUREMENT
(2021)
Article
Chemistry, Multidisciplinary
Tomas Straka, Lukas Vojtech, Marek Neruda
Summary: This paper presents a new approach to predicting indoor UHF RFID signal coverage using a graphical ray tracing method, which can generate a heat map with the accuracy of the Multi-Wall model.
APPLIED SCIENCES-BASEL
(2022)
Article
Engineering, Electrical & Electronic
Carlos Delgado, Eliseo Garcia, Lorena Lozano, Manuel Felipe Catedra
Summary: This article presents a technique for computing the monostatic radar cross section of complex objects using a combination of macro-basis functions and the multilevel fast multipole algorithm. By extracting critical points and dynamically selecting basis functions, the technique allows for a significant reduction in problem size with minimal CPU preprocessing overhead.
IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION
(2021)
Article
Physics, Multidisciplinary
Wu Chang-Mao, Tang Xiong-Xin, Xia Yuan-Yuan, Yang Han-Xiang, Xu Fan-Jiang
Summary: Ray tracing is a crucial tool in lens design and the study of optical physics, and its precision and stability are highly demanded. This paper presents an error model for ray tracing from the perspective of floating point arithmetic, and verifies its accuracy through numerical experiments and comparison with existing methods.
ACTA PHYSICA SINICA
(2023)
Article
Computer Science, Software Engineering
Ingo Wald, Stefan Zellmann, Will Usher, Nate Morrical, Ulrich Lang, Valerio Pascucci
Summary: The method efficiently renders Structured AMR data using a combination of two different data structures on GPU workstations, achieving high performance with little memory overhead, enabling interactive high quality rendering of complex AMR data sets.
IEEE TRANSACTIONS ON VISUALIZATION AND COMPUTER GRAPHICS
(2021)
Article
Oncology
Jun Li, Xile Zhang, Yuxi Pan, Hongqing Zhuang, Ruijie Yang
Summary: This study compares the applications of Ray Tracing (RT) and Monte Carlo (MC) algorithms in CyberKnife treatment of spine lesions. The results show that for thoracic spine lesions, the RT algorithm overestimates the target coverage and doses to organs at risk. However, for cervical, lumbar, and sacral spine lesions, the differences in target coverage between the RT and MC algorithms are small.
FRONTIERS IN ONCOLOGY
(2022)
Article
Ophthalmology
Karen E. Lee, Heather Heitkotter, Joseph Carroll
Summary: Optical coherence tomography (OCT) is a valuable tool for diagnosing and managing retinal and systemic diseases, with the ellipsoid zone (EZ) serving as a widely used biomarker for photoreceptor structure. Recent studies suggest that EZ reflectivity may be a more sensitive biomarker for photoreceptor structure changes. However, challenges such as interdevice variability, lack of standardization in image analysis, and ambiguity in correlating EZ reflectivity with photoreceptor structure hinder its widespread clinical utilization.
TRANSLATIONAL VISION SCIENCE & TECHNOLOGY
(2021)
Letter
Surgery
Ying Yang, Ming-Tian Wei, Wen-Jian Meng, Zi-Qiang Wang
ASIAN JOURNAL OF SURGERY
(2023)
Article
Surgery
Yu Shen, Mingtian Wei, Ting-Han Yang, Ye Shu, Lin Xia, Qingbin Wu, Hao Huang, Xiangbing Deng, Wenjian Meng, Zi-Qiang Wang
Summary: This study aims to determine the feasibility of Day-case loop ileostomy reversal (DLIR) in China based on the community hospital joined enhanced recovery after surgery (CHJ-ERAS) program. The results show that DLIR based on CHJ-ERAS does not increase postoperative complications and reoperations compared to in-patient loop ileostomy reversal. This study demonstrates that the CMJ-ERAS program can be a safe and feasible alternative option for inpatient LIR and an acceptable transitional approach for the development of day-case DLIR in developing countries.
AMERICAN JOURNAL OF SURGERY
(2023)
Article
Surgery
Wei-Jian Mei, Xiao-Zhong Wang, Yun-Feng Li, Yue-Ming Sun, Chun-Kang Yang, Jun-Zhong Lin, Zu-Guang Wu, Rui Zhang, Wei Wang, Yong Li, Ye-Zhong Zhuang, Jian Lei, Xiang-Bin Wan, Ying-Kun Ren, Yong Cheng, Wen-Liang Li, Zi-Qiang Wang, Dong-Bo Xu, Xian-Wei Mo, Hai-Xing Ju, Sheng-Wei Ye, Jing-Lin Zhao, Hong Zhang, Yuan-Hong Gao, Zhi-Fan Zeng, Wei-Wei Xiao, Xiao-Peng Zhang, Xuan Zhang, E. Xie, Yi-Fei Feng, Jing-Hua Tang, Xiao-Jun Wu, Gong Chen, Li-Ren Li, Zhen-Hai Lu, De-Sen Wan, Jin-Xin Bei, Zhi-Zhong Pan, Pei-Rong Ding
Summary: This study compared the efficacy of neoadjuvant chemotherapy alone and neoadjuvant chemoradiotherapy in patients with locally advanced rectal cancer. The results showed that neoadjuvant chemotherapy achieved similar rates of pathological complete response and downstaging compared to neoadjuvant chemoradiotherapy, but with lower incidence of perioperative distant metastasis and preventive ileostomy. CAPOX could be an effective alternative treatment option for patients with locally advanced rectal cancer.
Article
Materials Science, Multidisciplinary
Fei Yang, Rui Huang, Zi Qiang Wang, Han Zhang, Shuang Peng, Chen Xi Liu, Xiao Jian Fu, Jun Wei Wu
Summary: A programmable metasurface antenna, based on electrically tunable elements, is proposed in this paper for operation in the 5G millimeter-wave band. The antenna has the advantages of low cost, ease of manufacturing, low profile, and easy integration with planar circuits. By controlling the varactor-mounted elements with a DC bias signal, the antenna can dynamically change its coding and achieve beam steering. Experimental results demonstrate a wide scanning range and good agreement between simulated and measured results, indicating the potential applications of this electrically tunable metasurface array in radar and communication systems.
ADVANCED ENGINEERING MATERIALS
(2023)
Article
Computer Science, Interdisciplinary Applications
Shuhe Zhang, Tao Peng, Zeyu Ke, Han Yang, Tos T. J. M. Berendschot, Jinhua Zhou
Summary: In this study, the Retinex-qDPC method is proposed to improve the quality of phase recovery in the presence of mismatched background. By utilizing the edge features of images, the Retinex-qDPC models achieve high background-robustness qDPC reconstruction. The L1-Retinex-qDPC outperforms other state-of-the-art qDPC algorithms.
COMPUTER METHODS AND PROGRAMS IN BIOMEDICINE
(2023)
Article
Optics
Tao Peng, Zeyu Ke, Shuhe Zhang, Jun He, Peng Wang, Fengsong Wang, Zhensheng Zhong, Shu Fang, Hui Shi, Rongsheng Lu, Jinhua Zhou
Summary: Quantitative differential phase contrast (qDPC) microscopy is a high spatial resolution technique for phase imaging of unlabeled cell samples, but it is easily affected by experimental noise. In this study, L0-norm regularization was introduced into qDPC phase reconstruction for sparse samples (L0-qDPC) and compared with L2-norm and total variation regularization. The results showed that L0-qDPC method provides stable qDPC phase imaging without parameter adjustment, due to the strong constraint and good robustness of L0-norm based on sparse prior.
OPTICS AND LASERS IN ENGINEERING
(2023)
Article
Physics, Applied
Meng Shao, Rui Liu, Changxu Li, Zhe Chai, Zhensheng Zhong, Fengya Lu, Xunbin Wei, Jinhua Zhou, Min-Cheng Zhong
Summary: Optical tweezers are useful tools for non-contact cell manipulation, but currently limited to light-permeable organs. This study demonstrates the use of optical tweezers combined with oblique back-illumination microscopy to trap and evaluate erythrocyte deformability in opaque tissues.
APPLIED PHYSICS LETTERS
(2023)
Article
Oncology
Yu Shen, Ting-Han Yang, Xiangbing Deng, Qingbin Wu, Mingtian Wei, Wenjian Meng, Zi-Qiang Wang
Summary: BLAPER, a novel technique, is safe and effective in preventing small bowel descent into the retrourogenital space and subsequent development of perineal hernia and small bowel obstruction. It can be considered as an alternative option when primary suture of the pelvic peritoneum is not feasible.
JOURNAL OF SURGICAL ONCOLOGY
(2023)
Article
Engineering, Electrical & Electronic
Shuhe Zhang, Tos T. J. M. Berendschot, Jinhua Zhou
Summary: We propose a simple and efficient reconstruction algorithm, Elfpie, for Fourier ptychographic microscopy, which is robust to various system errors without the need for calibration or recovery. Elfpie utilizes a new image gradient-based data fidelity cost function regularized by global second-order total-variation regularization, and incorporates the AdaBelief optimizer with an adaptive learning rate.
Article
Biochemical Research Methods
Rui Liu, Meng Shao, Zeyu Ke, Changxu Li, Fengya Lu, Min-cheng Zhong, Yuxin Mao, Xunbin Wei, Zhensheng Zhong, Jinhua Zhou
Summary: Measuring the deformability of RBCs is crucial for transfusion and gas transport ability of RBCs during storage. However, traditional methods have low efficiency in measuring the deformability of RBCs with different morphologies. This study developed a cost-effective device and successfully measured the deformability of RBCs with different morphologies.
BIOMEDICAL OPTICS EXPRESS
(2023)
Article
Medicine, Research & Experimental
Ye-Ting Hu, Xiao-Feng Chen, Chun-Bao Zhai, Xiao-Tian Yu, Gang Liu, Zhi-Guo Xiong, Zi-Qiang Wang, San-Jun Cai, Wen-Cai Li, Xiang-Xing Kong, Qian Xiao, Cai-Hua Wang, Zhi-Hua Tao, Li-Yun Niu, Jian-Long Men, Qing Wang, Shao-Zhong Wei, Jun-Jie Hu, Ting-Han Yang, Jun-Jie Peng, Guo-Zhong Jiang, Ning Lv, Yi-You Chen, Shu Zheng, Yan-Hong Gu, Ke-Feng Ding
Summary: Colorectal cancer is a significant malignancy in China, and screening plays a crucial role in preventing and reducing mortality. A clinical study was conducted to evaluate the clinical performance of the FIT-sDNA test for CRC screening. The study involved high-risk individuals, and the results showed that the FIT-sDNA test had higher sensitivity in detecting CRC and advanced precancerous neoplasia compared to the FIT test. These findings suggest that the FIT-sDNA test has the potential to be a promising risk triaging modality in areas with limited colonoscopy resources.
Article
Optics
Zheng Jiayun, Wang Yikun, Ni Jingshu, Zhang Yang, Huang Yao, Zhang Yuanzhi, Wang Quanfu, Xia Wang, Yong Lui, Zhou Jinhua, Dong Meili
Summary: Excessive bacterial load can cause delayed wound healing, inflammatory reactions, and even life-threatening conditions. Traditional bacterial detection methods, such as visual observation and microbial swab sampling, are subjective and time-consuming. Therefore, a new method that can quickly and directly detect wound bacteria is needed. This study proposes a fluorescence detection imaging device based on the principles of bacterial fluorescence, providing a fast and direct approach for wound bacteria detection.
ACTA PHOTONICA SINICA
(2023)
Article
Instruments & Instrumentation
Chun Meng, Meng Shao, Xian-Feng Zhang, Lian-Sheng Zhang, Dong Chen, Min-Cheng Zhong
Summary: We propose an optical method that uses two tilted-focused beams to manipulate microparticles. Firstly, the action on microparticles is studied using a single tilted-focused beam, which drives the directional motion of a dielectric particle. Secondly, two tilted-focused beams with the same power and complementary tilt angles are used to assemble an optical trap, allowing for optical trapping of dielectric particles and opto-thermal trapping of light absorbing particles. The trapping mechanism involves the balance of forces exerted on the particles, including optical scattering force, optical gradient force, gravity, and thermal gradient force. The trap center is away from the focal spots, preventing the laser beam from being focused on the trapped object.
REVIEW OF SCIENTIFIC INSTRUMENTS
(2023)
Article
Optics
Peng Wang, Tao Peng, Shuhe Zhang, Fengya Lu, Zhensheng Zhong, Jun Li, Yi Wang, Jinhua Zhou
Summary: In this study, a sparse prior phase unwrapping (SPUP) algorithm was proposed to solve the wrapped phase problem in interferograms. By introducing L0-norm and L1-norm regularizations, the SPUP method exhibited strong denoising ability and high phase fidelity. It could effectively correct uneven background noise and phase shifting, demonstrating great potential in various interferometry measurements.
OPTICS AND LASER TECHNOLOGY
(2024)
Article
Chemistry, Physical
Meng Shao, Rui Liu, Changxu Li, Yue Sun, Zhensheng Zhong, Fengya Lu, Jinhua Zhou, Min-Cheng Zhong
Summary: Quantitative evaluation of the impact of different diluents on the elasticity characteristics of mouse erythrocytes was conducted using optical tweezers. The results show that, although the erythrocytes remained intact in the selected diluents, their deformability changed in different diluents.
