A5050962203- Radiation Dose and Imaging
- Medical Imaging Techniques and Applications
- Underwater Vehicles and Communication Systems
- Nuclear Engineering Thermal-Hydraulics
- Advanced X-ray and CT Imaging
- Nuclear and radioactivity studies
- Advanced Radiotherapy Techniques
- Water Quality Monitoring Technologies
- Risk and Safety Analysis
- Biomimetic flight and propulsion mechanisms
- Digital Radiography and Breast Imaging
- Graphite, nuclear technology, radiation studies
- Nuclear reactor physics and engineering
- Advances in Oncology and Radiotherapy
- Nuclear Materials and Properties
- Medical Research and Treatments
- Robotic Locomotion and Control
- Fluid Dynamics Simulations and Interactions
- Fish biology, ecology, and behavior
- Radiation Detection and Scintillator Technologies
- Control and Dynamics of Mobile Robots
- Radiation Therapy and Dosimetry
- Radioactive contamination and transfer
- Marine and Coastal Research
- Model Reduction and Neural Networks
Tsinghua University
2024
Key Laboratory of Nuclear Radiation and Nuclear Energy Technology
2024
Peking University
2019-2023
State Key Laboratory of Turbulence and Complex Systems
2019-2023
Chinese Center For Disease Control and Prevention
2019
Capital Medical University
2008-2016
Shanghai Municipal Center For Disease Control Prevention
2011-2014
National Institute for Radiological Protection
1996-2010
Centers for Disease Control and Prevention
2009
Fudan University
2008
Controlling biomimetic underwater robots in unknown flow fields remains a challenge due to the strong nonlinearity of fluid. This article investigates attitude holding task robotic fish swimming reality. Such typical sensing-based control requires keep desired angle attack an and even varied incoming flow. To this end, we propose learning-based approach by using deep neural network directly maps raw data sensors equipped on robot continuous signals end-to-end manner. First, based...
Accurate pose estimation and localization technology is always a challenge for small underwater robots, since the lighting conditions could limit use of cameras while cramped environments restrict sonars. In nature, some fishes perceive other creatures by sensing weakly changes in their environmental electric field. Inspired such passive sense behavior fish, this letter presents an electro-localization scheme based on short-distance accurate robots. Our includes hardware solution to method....
Dynamic modeling has beencapturing the attention for its fundamentality in precise locomotion analyses and control of underwater robots. In this article, we focused on 3-D dynamic experimental validation multiple motion patterns robots large-scale parameter space. A model an active-tail-actuated robotic fish with a barycentre regulating mechanism was first built by combining Newton's second law linear Euler's equation angular motion. Then, parameters were determined computer-aided design...
In nature, the lateral line system (LLS) is a critical sensor organ of fish for rheotaxis in complex environments. Inspired by LLS, numbers artificial systems (ALLSs) have been designed to fish-like robots flow field perception, assisting be stable face disturbances. However, almost all pressure based ALLSs challenge low signal noise ratio (SNR), resulting inaccurate perception information. To solve this problem, paper describes dual-sensor fusion method integrating with inertial measurement...
Lateral line system (LLS) is a sensory organ which serves functions in varieties of flow-relative fish behaviors. Inspired by excellent performances LLS behaviors, multiple artificial lateral systems (ALLSs) have been designed and applied to promote underwater robot technology. In this article, we focus on using ALLS for longitudinal separation sensing between two adjacent swimming robotic whose tails oscillate, meanwhile the are towed with precisely controlled speed equals rectilinear...
This study was designed to assess the trends in frequencies of nuclear medicine procedures Shanghai, China, and determine their contributions per capita effective dose Shanghai population. The mean activities radionuclides administered by departments were compared with Chinese national guidelines on diagnostic reference levels.On basis three surveys carried out Municipal Center for Disease Control Prevention 1996, 1998, 2008, typically radiopharmaceuticals, levels activity, number...
With the rapidly growing number of CT examinations, consequential radiation risk has aroused more and attention. The average dose in each organ during scans can only be obtained by using Monte Carlo simulation with computational phantoms. Since children tend to have higher sensitivity than adults, pediatric examinations requires special attention needs assessed accurately. So far, studies on doses from exposures for patients are still limited. In this work, a 1-year-old phantom was...
This article presents a novel localization scheme for free-swimming small underwater robots in large-scale environment. Accurate technology has always been challenge since the lighting conditions can limit their vision, while multipath interference issue occurring near wall plagues sonars. By contrast, some kinds of fish perceive positions by sensing electric field environment, giving them ability to accurately localize environments. Inspired sense behavior fish, this proposes based on...
Dynamic modeling has been capturing attention for its fundamentality in precise locomotion analyses and control of underwater robots. However, the existing researches have mainly focused on investigating two-dimensional motion robots, little paid to three-dimensional dynamic modeling, which is just what we focus on. In this article, a model an active-tail-actuated robotic fish with barycentre regulating mechanism built by combining Newton's second law linear Euler's equation angular motion....
Localization and sensing in the underwater environment has been a significant but difficult problem field of robotics. The lateral line system (LLS) is an essential component localization for most fish. Inspired by LLS, scientists have designed varieties artificial systems (ALLSs) researched their applications. This paper investigates on using ALLS azimuth wide range distance angle, even all directions, between two robotic Specifically, we consider scenario when boxfish with stays still uses...
Abstract The fuel assembly (FA) stands as a pivotal component within the reactor core, impacting safety, reliability, and economic viability of entire facility during lifetime. As newly-designed nuclear heating reactor, FA 200 MW (NHR200-II) embodies novel configuration, characterized by 9 × bundle arrangement inside, which are clamped three spacer girds along height direction, fully enclosed square zirconium channel outside for improving effective coolant flow rate. Under earthquake event,...
Abstract Irradiation during reactor operation causes continuous deformation in the fuel channels, resulting narrowing of control rod’s which directly affects safe insertion rods. Faced with a multi-physics coupling scenario where rod is affected by flow resistance and channel at same time. This paper proposes calculation scheme based on physical field decoupling iteration to calculate dropping process deformed channels. Specifically, firstly, empirical formula resistance, substitute initial...
Absorbed dose distributions in dental and maxillofacial cone beam computed tomography (dental CBCT) are essential to CBCT indices. Direct measurements by thermoluminescence detectors laborious. We establish a valid GEANT4 based absorbed simulation program with mean deviation being 7.25% compared experimental measurements. Dental simulated this indicate : The not always symmetry; Non-symmetry cases when phantom center is departured from isocenter, half-fan 360° scan angle range some case...