21 results on '"Jin, Wu"'
Search Results
2. In-vivo Fluorescent X-ray CT Imaging of Mouse Brain
- Author
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Takao Akatsuka, Naoki Sunaguchi, Kazuyuki Hyodo, T. Murakami, Jin Wu, Tohoru Takeda, S. Mouri, Seita Nasukawa, Qingkai Huo, Hidekata Hontani, Tetsuya Yuasa, Thet-Thet Lwin, and Manabu Minami
- Subjects
Physics ,business.industry ,Resolution (electron density) ,X-ray ,Fluorescence ,Nuclear magnetic resonance ,medicine.anatomical_structure ,In vivo ,Cortex (anatomy) ,Basal ganglia ,Medical imaging ,medicine ,ComputingMethodologies_DOCUMENTANDTEXTPROCESSING ,Cerebral perfusion pressure ,Nuclear medicine ,business - Abstract
application/pdf, Using a non-radioactive iodine-127 labeled cerebral perfusion agent (I-127 IMP), fluorescent X-ray computed tomography (FXCT) clearly revealed the cross-sectional distribution of I-127 IMP in normal mouse brain in-vivo. Cerebral perfusion of cortex and basal ganglion was depicted with 1 mm in-plane spatial resolution and 0.1 mm slice thickness. Degree of cerebral perfusion in basal ganglion was about 2-fold higher than that in cortical regions. This result suggests that in-vivo cerebral perfusion imaging is realized quantitatively by FXCT at high volumetric resolution.
- Published
- 2007
3. Validity of Fusion Imaging of Hamster Heart obtained by Fluorescent and Phase-Contrast X-Ray CT with Synchrotron Radiation
- Author
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Hidekata Hontani, Manabu Minami, Thet Thet Lwin, Kazuyuki Hyodo, Tetsuya Yuasa, Jin Wu, T. Murakami, Qingkai Huo, Seita Nasukawa, Tadanori Fukami, Tohoru Takeda, S. Mouri, Naoki Sunaguchi, and Takao Akatsuka
- Subjects
Image fusion ,Materials science ,business.industry ,Phase contrast microscopy ,X-ray ,Synchrotron radiation ,Fluorescence ,law.invention ,law ,Medical imaging ,ComputingMethodologies_DOCUMENTANDTEXTPROCESSING ,Nuclear medicine ,business ,Image resolution ,Image integration ,Biomedical engineering - Abstract
application/pdf, Fluorescent X-ray CT (FXCT) to depict functional information and phase-contrast X-ray CT (PCCT) to demonstrate morphological information are being developed to analyze the disease model of small animal. To understand the detailed pathological state, integration of both functional and morphological image is very useful. The feasibility of image fusion between FXCT and PCCT were examined by using ex-vivo hearts injected fatty acid metabolic agent (127I-BMIPP) in normal and cardiomyopathic hamsters. Fusion images were reconstructed from each 3D image of FXCT and PCCT. 127I-BMIPP distribution within the heart was clearly demonstrated by FXCT with 0.25 mm spatial resolution. The detailed morphological image was obtained by PCCT at about 0.03 mm spatial resolution. Using image integration technique, metabolic abnormality of fatty acid in cardiomyopathic myocardium was easily recognized corresponding to anatomical structures. Our study suggests that image fusion provides important biomedical information even in FXCT and PCCT imaging.
- Published
- 2007
4. Interferometric phase-contrast X-ray CT imaging of VX2 rabbit cancer at 35keV X-ray energy
- Author
-
Jin Wu, Akio Yoneyama, Kazuyuki Hyodo, Tohoru Takeda, Yoshinori Tsuchiya, Yuji Itai, and Thet-Thet Lwin
- Subjects
Materials science ,Image quality ,business.industry ,media_common.quotation_subject ,X-ray ,Synchrotron radiation ,Rabbit (nuclear engineering) ,equipment and supplies ,Interferometry ,Optics ,Astronomical interferometer ,Medical imaging ,ComputingMethodologies_DOCUMENTANDTEXTPROCESSING ,Contrast (vision) ,business ,media_common - Abstract
application/pdf, Imaging of large objects at 17.7-keV low x-ray energy causes huge x-ray exposure to the objects even using interferometric phase-contrast x-ray CT (PCCT). Thus, we tried to obtain PCCT images at high x-ray energy of 35keV and examined the image quality using a formalin-fixed VX2 rabbit cancer specimen with 15-mm in diameter. The PCCT system consisted of an asymmetrically cut silicon (220) crystal, a monolithic x-ray interferometer, a phase-shifter, an object cell and an x-ray CCD camera. The PCCT at 35 keV clearly visualized various inner structures of VX2 rabbit cancer such as necrosis, cancer, the surrounding tumor vessels, and normal liver tissue. Besides, image-contrast was not degraded significantly. These results suggest that the PCCT at 35 KeV is sufficient to clearly depict the histopathological morphology of VX2 rabbit cancer specimen.
- Published
- 2004
5. Design of Reinforcement Welding Machine within Steel Framework for Marine Engineering.
- Author
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Gang Wang and Jin Wu
- Subjects
- *
WELDING , *STEEL , *MARINE engineering , *PARAMETER estimation , *ELECTRONIC circuits - Abstract
In this project, a design scheme that reinforcement welding machine is added within the steel framework is proposed according to the double-side welding technology for box-beam structure in marine engineering. Then the design and development of circuit and transmission mechanism for new welding equipment are completed as well with one sample machine being made. Moreover, the trial running is finished finally. Main technical parameters of the equipment are: the working stroke: ≥1500mm, the welding speed: 8 ~ 15cm/min and the welding sheet thickness: ≥20mm. [ABSTRACT FROM AUTHOR]
- Published
- 2017
- Full Text
- View/download PDF
6. Scheme for Air Treatment in Welding Workshop.
- Author
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Gang Wang and Jin Wu
- Subjects
- *
WELDING instruction , *POLLUTION , *POISONOUS gases , *INDUSTRIAL waste purification , *WORKSHOPS (Facilities) - Abstract
There are two major ways to control the pollution of welding fume which are respectively local purification and comprehensive purification. In this paper, the practical welding workshop at school is taken as an example to realize fume treatment in different training conditions by adopting the scheme in which two major ways are combined. [ABSTRACT FROM AUTHOR]
- Published
- 2017
- Full Text
- View/download PDF
7. Phase Unwrapping Algorithm for Phase-Contrast X-Ray Computed Tomography using 2-D Auto Regressive Model
- Author
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Takaaki Horii, Qingkai Huo, Tetsuya Yuasa, Takao Akatsuka, Jin Wu, Thet-Thet-L Win, Tohoru Takeda, Kazuyuki Hyodo, Akio Yoneyama, R. Garrett, I. Gentle, K. Nugent, and S. Wilkins
- Subjects
Physics ,business.industry ,System of measurement ,Auto regressive model ,Image processing ,Phase unwrapping ,Interferometry ,Autoregressive model ,Astronomical interferometer ,Computer vision ,Tomography ,Artificial intelligence ,business ,Algorithm - Abstract
Phase‐contrast Computed Tomography (CT) delineates biological soft tissues, which cannot be clearly imaged using absorption‐contrast CT, at high contrast and high spatial resolution. Since the measurement system extracts phase‐shift information from interferograms acquired using an x‐ray interferometer, phase unwrapping is required to generate projections for CT reconstruction. In this research, we proposed a novel phase‐unwrap method based on 2‐dimensional auto regressive model (2‐D AR model). Then, we investigated the efficacy of the algorithm by simulation data generated from actual data acquired at KEK.
- Published
- 2010
8. Oblique interactions of dust density waves
- Author
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Yang-Fang Li, Zhehui Wang, Lujing Hou, Ke Jiang, De-Jin Wu, Hubertus M. Thomas, Gregor E. Morfill, Giuseppe Bertin, Franca De Luca, Giuseppe Lodato, Roberto Pozzoli, and Massimiliano Romé
- Subjects
Coupling ,Physics ,Dusty plasma ,Physics::Plasma Physics ,Physics::Space Physics ,Perpendicular ,Oblique case ,Astrophysics::Earth and Planetary Astrophysics ,Plasma ,Landau quantization ,Atomic physics ,Plasma oscillation ,Excitation - Abstract
Self‐excited dust density waves (DDWs) are studied in a striped electrode device. In addition to the usual perpendicularly (with respect to the electrode) propagating DDWs, which have been frequently observed in dusty plasma experiments on the ground, a low‐frequency oblique mode is also observed. This low‐frequency oblique DDW has a frequency much lower than the dust plasma frequency and its spontaneous excitation is observed even with a very low dust density. It is found that the low‐frequency oblique mode can exist either separately or together with the usual perpendicular mode. In the latter case, a new mode arises as a result of the interactions between the perpendicular and the oblique modes. The experiments show that these three modes satisfy the wave coupling conditions in both the frequencies and the wave‐vectors.
- Published
- 2010
9. Experimental Study on Laser Propulsion of Air-breathing Mode
- Author
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Jin Wu, Rongqing Tan, Yijun Zheng, Kuohai Zhang, Chongyi Wan, Yanning Yu, Shiming Liu, Guang Zheng, Donglei Wang, and Changjun Ke
- Subjects
Materials science ,business.industry ,Propulsion ,Injection seeder ,Laser ,law.invention ,Optics ,law ,Laser propulsion ,Ceiling (aeronautics) ,Free flight ,Laser power scaling ,business ,Coupling coefficient of resonators - Abstract
A series of experiments were done to investigate the effect of laser parameters on laser propulsion. A high power high repetition rate TEA CO2 laser was employed in the experiments. The output energy of the laser is up to 15J and the repetition rate is up to 150 pps. The light craft models in the experiments were two parabolic aluminum shells with the exit diameter of 50 mm, the focus lengths were 5mm and 10mm respectively. The effect of the laser’s repetition rate on coupling coefficient was mainly investigated. The value of optimal repetition rate for laser propulsion of air‐breathing mode is discussed. On the basis of our investigation, a setup of laser propulsion demonstration experiment was designed. And laser‐powered free flight demonstration was realized. The 4.2g parabolic craft with 10mm focus length was boosted by the TEA CO2 laser to the altitude of more than 2.6m (limited by the ceiling of the laboratory) in a flight lasting 1.75s. The output pulse energy is 13J and the repetition rate is 50 pps.
- Published
- 2006
10. Experimental Study of the Momentum Coupling Coefficient with the Pulse Frequency and Ambient Pressure for Air-Breathing Laser Propulsion
- Author
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Ping Gong, Jian Cai, Yan Lu, Rongqin Tan, Zhiping Tang, Xiaojun Hu, Zhijun Zheng, and Jin Wu
- Subjects
Momentum (technical analysis) ,Optics ,Altitude ,business.industry ,Chemistry ,Laser propulsion ,Pendulum ,Atomic physics ,Propulsion ,business ,Coupling coefficient of resonators ,Ambient pressure ,Pulse (physics) - Abstract
The air‐breathing laser propulsion tests are conducted for parabolic models by using a high power TEA‐CO2 pulsed laser. It is found the momentum coupling coefficient Cm varies with the pulse repeatable frequency and reaches the maximum near 50Hz. With a multi‐use pendulum chamber, the change of Cm at different ambient pressure is measured. The experimental results show that the propulsion efficiency Cm does not decrease below the altitude of 10km, even increases a little bit. The calculated Cm fits the experimental result up to altitude 3km, then, they are separated. One possible reason is the temperature which is constant in the experiments.
- Published
- 2006
11. Background and Tryout Report for BM2: Underbody Cross Member
- Author
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Cedric Xia, Jin Wu, Ming Chen, Edmund Chu, Chang Du, Dajun Zhou, Xinhai Zhu, Mai Huang, Li Zhang, and Ming F. Shi
- Subjects
Engineering ,Software ,Iterative design ,business.industry ,Benchmark (surveying) ,Process (computing) ,Automotive industry ,Addendum ,Trimming ,Structural engineering ,Fixture ,business - Abstract
An automotive underbody cross member was selected for one of the NUMISHEET’05 industrial benchmark to assess springback prediction capability of engineers around the world using various software. Binder and addendum were generated according to production intent process. Iterative design and draw simulation were performed on the part and addendum geometry to remove wrinkles and splits. Castings were poured and machined. Six different types of materials ranging from A15182‐O to DP965 were used in the production of the benchmark panels and three of these materials were included in the official benchmark data release. Draw panels were trimmed on a trimming fixture using laser and scanned with a whitelight optical device. Springback shapes at selected cross sections were recovered on the scanned data and original CAD data. In addition, major/minor and thickness strains were also measured at these sections.
- Published
- 2005
12. Specifications For BM2: Underbody Cross Member Panel
- Author
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Dajun Zhou and Jin Wu
- Subjects
Materials science ,Forming processes ,Mechanical engineering ,Bending ,Deformation (meteorology) - Published
- 2005
13. Springback Control With Variable Binder Force — Experiments And FEA Simulation
- Author
-
Li Zhang, Mark Garnett, James Principe, Changqing Du, Marcio Militisky, and Jin Wu
- Subjects
Pressing ,Curl (mathematics) ,Engineering ,business.product_category ,Bending (metalworking) ,business.industry ,Phase (waves) ,Die (manufacturing) ,Structural engineering ,Stamping ,business ,Finite element method ,Machine tool - Abstract
Side‐wall‐curl is a springback phenomena in typical automotive structural components, such as channel like rails and cross members. Minimizing or eliminating the side‐wall‐curl is one of the major challenges in stamping production. This challenge is exasperated when the component is formed from advanced high strength steels (AHSS). In this study a standard three‐piece draw die is used, in a series of experimental tests, to form a stamping with a hat‐shaped section from dual phase 590 (DP590). During the forming stroke, the binder force is varied to evaluate its influence on side‐wall‐curl. FEA springback simulations for two types of experiments with varied binder forces are also performed. The binder force profiles for several sheet materials are discussed and the correlation between the simulation results and the actual part measurements are illustrated.
- Published
- 2004
14. Large-Area Phase-Contrast X-ray Imaging System Using a Two-Crystal X-ray Interferometer—Development of an Interference-Pattern-Based Feedback Positioning System
- Author
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Kazuyuki Hyodo, Akio Yoneyama, Jin Wu, Yoshinori Tsuchiya, Thet-Thet Lwin, and T. Takeda
- Subjects
Physics ,Interferometry ,Optics ,business.industry ,Phase-contrast X-ray imaging ,Phase (waves) ,Astronomical interferometer ,X-ray optics ,business ,Interference (wave propagation) ,Image resolution ,X-ray interferometer - Abstract
To more accurately suppress the phase fluctuation of the interference beams of a large‐area phase‐contrast X‐ray imaging system using a two‐crystal X‐ray interferometer, a new feedback positioning system (FPS) has been developed and applied. The motion of interference patterns replaces the intensity of the interference beam in a small region as the feedback signal used in controlling the rotation of crystal blocks relative to each other. This FPS kept the phase fluctuation of the interference beams within π/15 over more than six hours. Examples of high‐quality two and three‐dimensional images of biological samples obtained by the imaging system with the new FPS are given.
- Published
- 2004
15. Phase Unwrapping Algorithm for Phase-Contrast X-Ray Computed Tomography using 2-D Auto Regressive Model.
- Author
-
Horii, Takaaki, Huo, Qingkai, Yuasa, Tetsuya, Akatsuka, Takao, Jin Wu, Win, Thet-Thet-L, Takeda, Tohoru, Hyodo, Kazuyuki, and Yoneyama, Akio
- Subjects
ALGORITHMS ,TOMOGRAPHY ,CROSS-sectional imaging ,MEDICAL radiography ,TISSUES - Abstract
Phase-contrast Computed Tomography (CT) delineates biological soft tissues, which cannot be clearly imaged using absorption-contrast CT, at high contrast and high spatial resolution. Since the measurement system extracts phase-shift information from interferograms acquired using an x-ray interferometer, phase unwrapping is required to generate projections for CT reconstruction. In this research, we proposed a novel phase-unwrap method based on 2-dimensional auto regressive model (2-D AR model). Then, we investigated the efficacy of the algorithm by simulation data generated from actual data acquired at KEK. [ABSTRACT FROM AUTHOR]
- Published
- 2010
- Full Text
- View/download PDF
16. Experimental Study on Laser Propulsion of Air-breathing Mode.
- Author
-
Rongqing Tan, Yijun Zheng, Changjun Ke, Donglei Wang, Kuohai Zhang, Guang Zheng, Chongyi Wan, Shiming Liu, Jin Wu, and Yanning Yu
- Subjects
PROPULSION systems ,ENGINEERING systems ,FREE flight (Air traffic control) ,LASERS ,LIGHT amplifiers ,INSTRUMENT flying ,AERONAUTICAL instruments - Abstract
A series of experiments were done to investigate the effect of laser parameters on laser propulsion. A high power high repetition rate TEA CO2 laser was employed in the experiments. The output energy of the laser is up to 15J and the repetition rate is up to 150 pps. The light craft models in the experiments were two parabolic aluminum shells with the exit diameter of 50 mm, the focus lengths were 5mm and 10mm respectively. The effect of the laser’s repetition rate on coupling coefficient was mainly investigated. The value of optimal repetition rate for laser propulsion of air-breathing mode is discussed. On the basis of our investigation, a setup of laser propulsion demonstration experiment was designed. And laser-powered free flight demonstration was realized. The 4.2g parabolic craft with 10mm focus length was boosted by the TEA CO2 laser to the altitude of more than 2.6m (limited by the ceiling of the laboratory) in a flight lasting 1.75s. The output pulse energy is 13J and the repetition rate is 50 pps. © 2006 American Institute of Physics [ABSTRACT FROM AUTHOR]
- Published
- 2006
- Full Text
- View/download PDF
17. Experimental Study of the Momentum Coupling Coefficient with the Pulse Frequency and Ambient Pressure for Air-Breathing Laser Propulsion.
- Author
-
Zhiping Tang, Jian Cai, Ping Gong, Xiaojun Hu, Rongqin Tan, Zhijun Zheng, Jin Wu, and Yan Lu
- Subjects
LASER plasmas ,LASER beams ,PLASMA gases ,PULSE frequency modulation ,ELECTRONIC data processing - Abstract
The air-breathing laser propulsion tests are conducted for parabolic models by using a high power TEA-CO2 pulsed laser. It is found the momentum coupling coefficient Cm varies with the pulse repeatable frequency and reaches the maximum near 50Hz. With a multi-use pendulum chamber, the change of Cm at different ambient pressure is measured. The experimental results show that the propulsion efficiency Cm does not decrease below the altitude of 10km, even increases a little bit. The calculated Cm fits the experimental result up to altitude 3km, then, they are separated. One possible reason is the temperature which is constant in the experiments. © 2006 American Institute of Physics [ABSTRACT FROM AUTHOR]
- Published
- 2006
- Full Text
- View/download PDF
18. Specifications For BM2: Underbody Cross Member Panel.
- Author
-
Jin Wu and Dajun Zhou
- Subjects
- *
SOFTWARE compatibility , *BENDING (Metalwork) , *SIMULATION methods & models , *METALWORK , *MANUFACTURING processes , *METALWORKING industries - Abstract
The article reports on a study to benchmark springback prediction capability of various software and skills of users on an underbody part mostly dominated by bending effect. The simulation process of stamping a cross member panel consists of three operations: forming, trimming and springback. In this benchmark, participants are allowed to use either physical beads or line beads in forming simulation. The information of physical bead geometry and bead centerlines is provided in the Nastran mesh file and IGES file.
- Published
- 2005
- Full Text
- View/download PDF
19. Background and Tryout Report for BM2: Underbody Cross Member.
- Author
-
Li Zhang, Dajun Zhou, Jin Wu, Chang Du, Ming F. Shi, Ming Chen, Mai Huang, Cedric Xia, Xinhai Zhu, and Edmund Chu
- Subjects
BENCHMARKING (Management) ,INDUSTRIAL lasers ,MANUFACTURING processes ,EUCLID'S elements ,COMPUTER-aided design ,GEOMETRY - Abstract
An automotive underbody cross member was selected for one of the NUMISHEET’05 industrial benchmark to assess springback prediction capability of engineers around the world using various software. Binder and addendum were generated according to production intent process. Iterative design and draw simulation were performed on the part and addendum geometry to remove wrinkles and splits. Castings were poured and machined. Six different types of materials ranging from A15182-O to DP965 were used in the production of the benchmark panels and three of these materials were included in the official benchmark data release. Draw panels were trimmed on a trimming fixture using laser and scanned with a whitelight optical device. Springback shapes at selected cross sections were recovered on the scanned data and original CAD data. In addition, major/minor and thickness strains were also measured at these sections. © 2005 American Institute of Physics [ABSTRACT FROM AUTHOR]
- Published
- 2005
- Full Text
- View/download PDF
20. Springback Control With Variable Binder Force — Experiments And FEA Simulation.
- Author
-
Changqing Du, Jin Wu, Militisky, Marcio, Principe, James, Garnett, Mark, Li Zhang, Ghosh, S., Castro, J. C., and Lee, J. K.
- Subjects
- *
PHYSICS , *STEEL , *AUTOMOBILES , *METAL stamping , *BINDING agents , *FINITE element method - Abstract
Side-wall-curl is a springback phenomena in typical automotive structural components, such as channel like rails and cross members. Minimizing or eliminating the side-wall-curl is one of the major challenges in stamping production. This challenge is exasperated when the component is formed from advanced high strength steels (AHSS). In this study a standard three-piece draw die is used, in a series of experimental tests, to form a stamping with a hat-shaped section from dual phase 590 (DP590). During the forming stroke, the binder force is varied to evaluate its influence on side-wall-curl. FEA springback simulations for two types of experiments with varied binder forces are also performed. The binder force profiles for several sheet materials are discussed and the correlation between the simulation results and the actual part measurements are illustrated. © 2004 American Institute of Physics [ABSTRACT FROM AUTHOR]
- Published
- 2004
- Full Text
- View/download PDF
21. Interferometric phase-contrast X-ray CT imaging of VX2 rabbit cancer at 35keV X-ray energy.
- Author
-
Takeda, Tohoru, Jin Wu, Tsuchiya, Yoshihiro, Yoneyama, Akio, Thet-Thet-Lwin, Hyodo, Kazuyuki, Itai, Yuji, and Warwick, T.
- Subjects
- *
CANCER , *ANIMAL models in research , *MEDICAL imaging systems , *INTERFEROMETRY , *TOMOGRAPHY , *X-rays - Abstract
Imaging of large objects at 17.7-keV low x-ray energy causes huge x-ray exposure to the objects even using interferometric phase-contrast x-ray CT (PCCT). Thus, we tried to obtain PCCT images at high x-ray energy of 35keV and examined the image quality using a formalin-fixed VX2 rabbit cancer specimen with 15-mm in diameter. The PCCT system consisted of an asymmetrically cut silicon (220) crystal, a monolithic x-ray interferometer, a phase-shifter, an object cell and an x-ray CCD camera. The PCCT at 35 keV clearly visualized various inner structures of VX2 rabbit cancer such as necrosis, cancer, the surrounding tumor vessels, and normal liver tissue. Besides, image-contrast was not degraded significantly. These results suggest that the PCCT at 35 KeV is sufficient to clearly depict the histopathological morphology of VX2 rabbit cancer specimen. © 2004 American Institute of Physics [ABSTRACT FROM AUTHOR]
- Published
- 2004
- Full Text
- View/download PDF
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