37 results on '"C.-T. Hsieh"'
Search Results
2. A simple method for identification of singleton fuzzy models.
- Author
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Cheng-Liang Chen, S.-H. Hsu, C.-T. Hsieh, and T.-C. Wang
- Published
- 2005
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3. Apoptosis to predict copepod mortality: state of the art and future perspectives
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Tzu-Ming Liu, David Pellegrini, Antonio Miralto, Davide Sartori, Chi-Kuang Sun, C.-T. Hsieh, Giovanna Romano, S.-H. Cheng, Jiang-Shiou Hwang, Adrianna Ianora, and Isabella Buttino
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Programmed cell death ,Necrosis ,biology ,fungi ,Cell ,Aquatic Science ,biology.organism_classification ,Multiphoton Fluorescence Microscopy ,law.invention ,Cell biology ,medicine.anatomical_structure ,Apoptosis ,In vivo ,Confocal microscopy ,law ,medicine ,medicine.symptom ,Copepod - Abstract
Apoptosis or programmed cell death is the result of complex biochemical and genetic signals triggered by normal physiological events or by exposure to toxic compounds. Apoptosis can be revealed early in cells and tissues due to morphological and biochemical alterations of the cell. Here, we review recent progress in the study of the induction and detection of apoptosis in zooplankton copepods after their exposure to different apoptotic-inducer compounds, and we propose methods to predict copepod mortality even when animals appear normal. We also discuss the use of higher harmonic generation microscopy and multiphoton fluorescence microscopy techniques as possible tools to visualize apoptosis in vivo copepods without using any fluorescent probes. more...
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- 2010
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4. How Does a Gurney Flap Enhance the Aerodynamics Forces?
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Yang-Yao Niu, Chin-Chou Chu, Chien-Cheng Chang, C. T. Hsieh, and Ting-Shiu Hsu
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Lift-to-drag ratio ,Physics ,Airfoil ,Lift coefficient ,Drag coefficient ,business.industry ,Aerospace Engineering ,Mechanics ,Pressure coefficient ,Physics::Fluid Dynamics ,Lift (force) ,Drag ,Astrophysics::Solar and Stellar Astrophysics ,Aerospace engineering ,business ,Gurney flap - Abstract
CD = total drag coefficient CDa = drag coefficient associated with the acceleration of the wing CDm = drag coefficient associated with the motion of the wing CDs = drag coefficient associated with the surface vorticity and friction on the wing surface CDv = drag coefficient associated with to vorticity within the flowfield CL = total lift coefficient CLa = lift coefficient associated with the acceleration of the wing CLm = lift coefficient associated with the motion of the wing CLs = lift coefficient associated with the surface vorticity and friction on the wing surface CLv = lift coefficient associated with to vorticity within the flowfield c = chord length P = static fluid pressure Re = Reynolds number U max = maximum velocity u = velocity vector = air viscosity = air density = auxiliary potential function ! = vorticity more...
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- 2010
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5. Quality performance analysis for the whole product family with multiple characteristics: apply the cooling pump as an example
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Kuen-Suan Chen, C. T. Hsieh, and S. C. Chen
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Measure (data warehouse) ,Computer science ,Process (engineering) ,business.industry ,Process capability ,media_common.quotation_subject ,Chart ,Process capability index ,Process performance index ,Operations management ,Product (category theory) ,Function (engineering) ,Process engineering ,business ,media_common - Abstract
The function of cooling pump is to release and cool off the heat caused by the operation process of cutting tools and their related cutting materials, through cooling oil cycle effects, therefore to avoid damage to the tools and their materials. Three quality characteristics of cooling pump: function, safety and energy-saving, must meet the requirement of CNS-5703 product safety standard. Through multi-process capability analysis chart, we can improve and control those poor qualities of various pump products. Process Capability Indices (PCIs) are powerful tools to study the process ability for manufacturing product that meets specifications. A larger process capability index implies a higher process yield, and lower expected process loss. In the past references based on Cp , Cpu , Cpl , and Cps , the approach of this research is to develop one integrated process capability analysis that can precisely measure product with larger-the-better and smaller-the-better multi-process, and nominal-the-best... more...
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- 2009
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6. Applications of Laser-Fabricated Plasma Structures in Laser-Wakefield Accelerators, X-ray Lasers and Plasma Nonlinear Optics
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M.-C. Chou, P.-H. Lin, C.-L. Chang, C.-T. Hsieh, L.-C. Tai, Jiunn-Yuan Lin, M.-W. Lin, C.-C. Kuo, Jyhpyng Wang, S.-H. Chen, C.-H. Pai, Gin Yih Tsaur, S.-Y. Chen, Y.-C. Ho, and T.-Y. Chien
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Physics ,X-ray laser ,Optics ,law ,business.industry ,X-ray ,General Physics and Astronomy ,Nonlinear optics ,Plasma ,Laser ,business ,law.invention - Published
- 2008
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7. Electron spin resonance studies on quantum tunneling in spinel ferrite nanoparticles
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Juh Tzeng Lue and C. T. Hsieh
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Quantum phase transition ,Materials science ,Condensed matter physics ,Heisenberg model ,Quantum critical point ,Magnetic nanoparticles ,Condensed Matter::Strongly Correlated Electrons ,Quantum Hall effect ,Single domain ,Condensed Matter Physics ,Quantum statistical mechanics ,Electronic, Optical and Magnetic Materials ,Superparamagnetism - Abstract
The electron spin resonance (ESR) spectrometer, a very sensitive instrument with fast detecting window to explore quantum phase transitions for magnetic nanoparticles, was exploited to study the fascinating interplay between thermal and quantum fluctuations in the vicinity of a quantum critical point. We have measured ESR in ferrofluid samples containing nanosize particles of Fe 2 O 3 . The evolution of the ESR spectrum with temperature suggests that quantum tunneling of spins occurs in single domain magnetic particles in the low temperature regime. The effects of various microwave fields, particle sizes, and temperatures on the magnetic states of single domain spinel ferrite nanoparticles are investigated. We can consistently explain experimental data assuming that, as the temperature decreases, the spectrum changes from superparamagnetic (SPR) to blocked SPR and finally evolves quantum superparamagnetic behaviour as the temperature lowers down further. A nanoparticle system of a highly anisotropic magnetic material can be qualitatively specified by a simple quantum spin model, or by the Heisenberg model with strong easy-plane anisotropy. more...
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- 2003
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8. Crisp-type fuzzy logic controller using Dubois and Prade's parametric t-norm-sum-gravity inference methods
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C.-T. Hsieh, C.-L. Chen, and Y.-C. Lai
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Inference ,T-norm ,Fuzzy control system ,Type (model theory) ,Fuzzy logic ,Alpha (programming language) ,Nonlinear system ,Control and Systems Engineering ,Control theory ,Applied mathematics ,Electrical and Electronic Engineering ,Instrumentation ,Parametric statistics ,Mathematics - Abstract
The input/output relationship of a class of crisp-type fuzzy logic controllers (FLCs) using parametric t-norm-sum-gravity inference method is examined. The explicit mathematical form of reasoning surface using Dubois and Prade's parametric t-norm is addressed. Reasoning surfaces of crisp-type FLCs are proved to be composed of a two-dimensional multilevel relay and a local position-dependent nonlinear compensator. The influence of the /spl alpha/ value, the parameter of Dubois and Prade's parametric t-norm, on the reasoning surfaces is also investigated. more...
- Published
- 2000
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9. A general form for calculating residual stresses detected by using the holographic blind-hole method
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C. T. Hsieh, S. T. Lin, and Chia-Hsin Lee
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Engineering ,business.industry ,Mechanical Engineering ,Mathematical analysis ,Holography ,Aerospace Engineering ,Holographic interferometry ,Interference (wave propagation) ,Upper and lower bounds ,law.invention ,Data point ,Optics ,Mechanics of Materials ,Residual stress ,law ,Displacement field ,Solid mechanics ,business - Abstract
A general form used for analyzing residual stresses measured using the holographic blind-hole method is introduced in this paper. Adopting the general form presented, the residual stresses can be obtained using three relative displacements measured from a single interference fringe pattern. Even for the case in which phase-shifting holographic interferometry is not employed, interpolating calculations for determining the fringe orders are not needed, since the choice of data points becomes more flexible when using this general form. Two experiments, the first one carried out by the authors and the second one published previously, are used to illustrate the applicability and usefulness of this general form. Suggestions for the applications of this general form are also established via the upper bound error estimations. more...
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- 1998
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10. Highly Reliable Flash Memory with Self-Aligned Split-Gate Cell Embedded into High Performance 65nm CMOS for Automotive & Smartcard Applications
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T. Kern, Robert Strenz, J. Hsiao, C. T. Hsieh, Y. T. Lin, G. Tempel, R. Duschl, A. Gratz, E. Suryaputra, K. Ho, A. Iserhagen, J.R. Power, C. Bukethal, V. Pissors, M. Rohrich, H. H. Kuo, C. M. Huang, C. H. Tan, R. Ullmann, W. Dickenscheid, D. Shum, L. C. Tran, S. Paprotta, W. Langheinrich, E. O. Andersen, C. W. Hung, and C. W. Ho more...
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Modularity (networks) ,Reliability (semiconductor) ,CMOS ,Computer science ,business.industry ,Embedded system ,Logic gate ,Overhead (engineering) ,Hardware_INTEGRATEDCIRCUITS ,Process (computing) ,Modular design ,business ,Flash memory - Abstract
A split-gate (SG) flash memory cell has been embedded in a 65nm ground-rule high performance (HP) CMOS logic process with copper low K interconnects. A gate spacer processing sequence self-aligned (SA) process provides a reliability-robust cell and high degree of modularity with one extra mask to form the SG structure. The proposed cell is optimized for minimum module area overhead, high endurance and can be integrated in a standard stacked gate Technology in a modular way. more...
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- 2012
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11. Two holographic blind-hole methods for measuring residual stresses
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C. T. Hsieh, C. P. Hu, and S. T. Lin
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Materials science ,Plane (geometry) ,business.industry ,Mechanical Engineering ,Holography ,Aerospace Engineering ,Holographic interferometry ,Displacement (vector) ,Finite element method ,law.invention ,Optics ,Interference (communication) ,Mechanics of Materials ,law ,Residual stress ,Electronic speckle pattern interferometry ,business - Abstract
The relationship between the displacements and stresses relieved from blind-hole drilling is introduced via an easily understandable concept in this paper. Combining this concept with holographic interferometry, two holographic blind-hole methods for measuring residual stresses are established. The first is a new technique which requires measuring three out-of plane displacements; and the second is a modification of another technique which requires measuring two out-of plane displacements. Each of the two methods needs only one interference fringe pattern and is demonstrated by using it to measure a known residual stress in an aluminum specimen. more...
- Published
- 1994
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12. TWO-LEVEL OPTIMAL PI CONTROLLER DESIGN
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C. T. Hsieh, T. L. Huang, and S. C. Chen
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State variable ,Electric power system ,Engineering ,Control theory ,business.industry ,Open-loop controller ,Torque ,PID controller ,Systems design ,Control engineering ,Electrical and Electronic Engineering ,business ,Optimal control - Abstract
This paper addresses the design of two-level Power System Stabilizers using an optimal reduced order model whose state variables are torque angles and speeds. The reduced-order model retains their physical meaning and is used to design a two-level linear feedback controller that takes into account the realities and constraints of eletric power system. The two-level control strategy is used and a global control signal is generated from the output variables to minimize the effect of interactions. Effectiveness of this controller is evaluated and an example of a multimachine system, is given to illustrate the advantage of the proposed method. Reponses of the system with two-level scheme and optimal reduced order scheme are included for comparative analysis. more...
- Published
- 1993
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13. Focal plane imaging systems for millimeter wavelengths
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C. T. Hsieh, Paul F. Goldsmith, E. L. Moore, G.R. Huguenin, and J. Kapitzky
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Physics ,Radiation ,business.industry ,Detector ,Schottky diode ,Condensed Matter Physics ,law.invention ,Lens (optics) ,Optics ,Cardinal point ,Microwave imaging ,law ,Radiometry ,Systems design ,Electrical and Electronic Engineering ,Image sensor ,business - Abstract
The authors discuss critical aspects of imaging system design and describe several different imaging systems employing focal plane array receivers operating in the 3-mm-2-mm wavelength range. Recent progress in millimeter-wavelength optics, antennas, receivers and other components permits greatly enhanced system performance in a wide range of applications. A radiometric camera for all-weather autonomous aircraft landing capability and a high sensitivity cryogenically cooled array for use in radio astronomical spectroscopy are presented. A near-focus system for identification of plastic materials concealed underneath clothing employs a two element lens, and has been demonstrated in active (transmitting) and passive (radiometric) modes. A dual-mode imaging system for plasma diagnostics utilizes both active and passive modes at its approximately=140-GHz operating frequency to study small-scale structure. The radiometric imaging systems employ between 15 and 256 Schottky barrier diode mixers, while the imaging receivers for the active systems include 64-element video detector arrays. > more...
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- 1993
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14. Fabrication And Superhydrophobic Behavior Of Fluorinated Silica Nanosphere Arrays
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C.-T. Hsieh, Y.-S. Shen, F.-L. Wu, and W.-Y. Chen
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- 2010
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15. An enhanced method for identification of capacitor switching transient using Approximate Entropy
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K. L. Lew, C. T. Hsieh, Chin-shun Tsai, and Shyh-Jier Huang
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Capacitor ,Signal classification ,Identification scheme ,Control theory ,law ,Decoupling capacitor ,Transient analysis ,Approximate entropy ,Mathematics ,law.invention - Abstract
This paper proposes an identification scheme of capacitor switching transients using Approximate Entropy (ApEn) approach. Detailed procedures of the proposed scheme are presented. Simulation and real results indicated that the scheme is feasible for classification of power event signals. more...
- Published
- 2010
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16. Detection of wind turbine blades damage by spectrum-recognition using gaussian wavelet-entropy
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C. S. Tsai, K. L. Lew, and C. T. Hsieh
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Signal processing ,Wind power ,Turbine blade ,Computer science ,business.industry ,Gaussian ,Speech recognition ,Wavelet transform ,law.invention ,symbols.namesake ,Wavelet ,law ,symbols ,Entropy (information theory) ,business ,Algorithm ,Continuous wavelet transform - Abstract
In this paper, a complex continuous wavelet transform (CWT)-based entropy method is proposed to enhance the damage-detection capability of wind turbine blades. By embedding the time-frequency localization features in wavelets, wavelet entropy of acquired signals can be readily computed. This approach can form a quantitative index systematically to detect the damage of blades, anticipating formulating a forewarning mechanism for wind power system. Test results demonstrated the practicality and advantages of the method for the application considered. more...
- Published
- 2009
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17. Keyhole surgery for isolated pituitary stalk metastatic tumors: a case report and review of the literature
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C. T. Hsieh, En Yuan Lin, T. H. Tsai, C. S. Lin, and Y. H. Chiang
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Adult ,Pathology ,medicine.medical_specialty ,Pituitary gland ,Breast Neoplasms ,Adenocarcinoma ,Neurosurgical Procedures ,Breast cancer ,medicine ,Biomarkers, Tumor ,Humans ,Minimally Invasive Surgical Procedures ,Pituitary Neoplasms ,Neoplasm Metastasis ,Pathological ,Pituitary stalk ,medicine.diagnostic_test ,business.industry ,Polyuria ,Cancer ,Magnetic resonance imaging ,General Medicine ,medicine.disease ,Metastatic breast cancer ,Magnetic Resonance Imaging ,Surgery ,medicine.anatomical_structure ,Treatment Outcome ,Pituitary Gland ,Diabetes insipidus ,Frontal Bone ,Female ,Neurology (clinical) ,business ,Craniotomy ,Diabetes Insipidus - Abstract
Solitary metastastic pituitary stalk tumors account for approximately less than 1% of all pituitary gland tumors and present difficulties in clinical diagnosis because most of them are clinically silent and usually too small to cause radiological changes. With the advance of microsurgical techniques, keyhole surgery is indicated to obtain a specimen for pathological diagnosis and possible removal of the tumor. Here, we reported a patient who has a history of advanced breast cancer and who complained of poly-uria and polydypsia. Magnetic resonance images revealed a solitary tumor over the pituitary stalk. A right supraorbital craniotomy was performed and the pathological report confirmed the diagnosis of metastatic breast cancer. This is the first case report using keyhole surgery to confirm the pathology and improve the clinical symptoms. The relevant literature is also reviewed. more...
- Published
- 2008
18. Active clamp interleaved forward converter with single-capacitor turn-off snubber for stunning poultry applications
- Author
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C.-T. Hsieh, S.-Y. Tseng, and Ho Lin
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Forward converter ,Engineering ,business.industry ,Buck–boost converter ,Ćuk converter ,Electrical engineering ,Inductor ,law.invention ,Capacitor ,law ,Snubber ,Electronic engineering ,Inverter ,business ,Transformer - Abstract
This paper proposes an active clamp interleaved forward converter with a single-capacitor turn-off snubber constructed with a full-bridge inverter for stunning poultry applications. The proposed converter can use active clamp circuit to recover the energy trapped in magnetizing and leakage inductors of transformer and to achieve zero-voltage switching at turn-on transition. In addition, the proposed one adopts a single-capacitor snubber not only to smooth out switch voltage at turn-off transition for reducing switching loss but to decrease the ringing voltage across output freewheeling diodes of the proposed converter at turn-on transition of each switch. As compared with the counterparts of the conventional converter topologies, the proposed converter has the merits of less component counts, higher efficiency, smaller size, and they are easier to implement Performance measurements from a prototype have verified feasibility of the overall system design. This designed system has contributed a lot of humane slaughter and has attracted much attention. more...
- Published
- 2008
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19. Active clamp flyback converter with current sharing scheme for multi-channel poultry stunning applications
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S.-Y. Tseng, Y.-H. Su, and C.-T. Hsieh
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Engineering ,Control theory ,business.industry ,Flyback converter ,Electronic engineering ,Electrical engineering ,Inverter ,Dither ,business ,Electrical impedance ,Power (physics) ,Communication channel ,Voltage - Abstract
This paper presents an intelligent poultry stunner with a current sharing controller for improving carcass quality and animal welfare. In this circuit structure, a stunner which is composed of active clamp flyback converter and full-bridge inverter, and a dither voltage generator which is adopted to fast breakdown the skin impedance of the poultry for reducing poultry stress and improving carcass quality during the stunning interval. To apply to multi-channel stunning system, a current sharing controller associated with the dither voltage generator is proposed to solve current imbalance of each stunning channel due to different impedances between poultry. Compared with the one without the current sharing controller, the proposed one can raise the coma effectiveness of over 10 %. Performance measurements from a prototype, which its output voltage varies form 60 to 120 V and its output power changes from 60 W to 240 W under a fixed frequency of 400 Hz, have verified the current sharing features between two channels and the feasibility of the overall system design. more...
- Published
- 2008
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20. Interleaved flyback converter with turn-on/off snubber for poultry stunning applications
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C.-T. Hsieh, Chia-Ming Yang, and S.-Y. Tseng
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Engineering ,Flyback converter ,business.industry ,Ripple ,Buck–boost converter ,Electrical engineering ,Inductor ,law.invention ,Capacitor ,law ,Boost converter ,Electronic engineering ,Snubber ,business ,Voltage - Abstract
This paper proposes an interleaved flyback converter with a novel L-C-D snubber to reduce turn-on and turn-off losses. The proposed L-C-D snubber is composed of a single capacitor to form turn-off snubber, and an inductor and a diode connected in parallel to form turn-on snubber. In this circuit structure, the turn-off snubber is used to limit rising rate of drain-source voltage of MOSFET and to reduce turn-off switching loss. While, the turn-on ones are used to smooth out current passing switch and to reduce turn-on switching loss. In addition, the proposed converter is operated in an interleaved fashion to reduce output current ripple. Compared with the counterparts of conventional converter topologies, the proposed converter has the merits of less component counts, higher efficiency, small size, and they are easier to implement. Measured results obtained from a prototype flyback converter have verified the feasibility. more...
- Published
- 2008
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21. Active Clamp Interleaved Flyback Converter with Single-Capacitor Turn-off Snubber for Stunning Poultry Applications
- Author
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C.-T. Hsieh, S.-Y. Tseng, and Ho Lin
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Forward converter ,Engineering ,Flyback converter ,business.industry ,Buck–boost converter ,Electrical engineering ,law.invention ,Capacitor ,law ,Snubber ,Electronic engineering ,Inverter ,business ,Transformer ,Voltage - Abstract
The paper proposes an active clamp interleaved flyback converter with a single-capacitor turn-off snubber associated with a full-bridge inverter for stunning poultry applications. The proposed converter can use active clamp circuit to recover the energy of transformer and to achieve zero-voltage switching at turn-on transition. In addition, the proposed one adopts a single-capacitor snubber not only to smooth out switch turn-off transient for reducing turn-off loss but to reduce the ringing voltage of diodes in secondary winding of transformer when switch of the proposed one is operated at turn-on transition. Compared with the counterparts of the conventional converter topologies, the proposed converter has the merits of less component counts, higher efficiency, smaller size, and they are easier to implement. Performance measurements from a prototype have verified feasibility of the overall system design. This designed system has contributed a lot of humane slaughter and has attracted much attention. more...
- Published
- 2007
- Full Text
- View/download PDF
22. Production of a monoenergetic electron bunch in a self-injected laser-wakefield accelerator
- Author
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Jyhpyng Wang, S.-Y. Chen, Yen-Mu Chen, C. T. Hsieh, Jiunn-Yuan Lin, Chun-Lin Chang, and Y. C. Ho
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Physics ,Laser ablation ,Physics::Medical Physics ,Transverse wave ,Electron ,Plasma ,Laser ,Plasma acceleration ,law.invention ,Acceleration ,Physics::Plasma Physics ,law ,Physics::Accelerator Physics ,Atomic physics ,Beam (structure) - Abstract
Production of a monoenergetic electron bunch in a self-injected laser-wakefield accelerator is investigated with a tomographic method which resolves the electron injection and acceleration processes. It is found that all the electrons in the monoenergetic electron bunch are injected at the same location in the plasma column and then accelerated with an acceleration gradient exceeding 2 GeV/cm. The injection position shifts with the position of pump-pulse focus, and no significant deceleration is observed for the monoenergetic electron bunch after it reaches the maximum energy. The results are consistent with the model of transverse wave breaking and beam loading for the injection of monoenergetic electrons. The tomographic method adds a crucial dimension to the whole array of existing diagnostics for laser beams, plasma waves, and electron beams. With this method the details of the underlying physical processes in laser-plasma interactions can be resolved and compared directly to particle-in-cell simulations. more...
- Published
- 2007
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23. A Novel Turn-On/Off Snubber for Interleaved Boost Converters
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W.-S. Jwo, S.-Y. Tseng, H.H. Chang, C.-T. Hsieh, and J.-Z. Shiang
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Capacitor ,Computer science ,law ,Boost converter ,Ripple ,Limit (music) ,Snubber ,Electronic engineering ,Converters ,Inductor ,Voltage ,law.invention - Abstract
This paper proposes an interleaved boost converter with a novel L-C-D snubber to reduce turn-on and turn-off switching losses. The proposed L-C-D snubber is composed of a single capacitor to form turn-off snubber, and an inductor and a diode connected in parallel to form a turn-on snubber. In this circuit structure, the turn-off snubber is used to limit rising rate of voltage across switch of the proposed converter and to reduce turn-off switching loss. While, the turn-on ones are used to smooth out current through switch of the proposed one and to reduce turn-on switching loss. Furthermore, the proposed converter is operated in an interleaved fashion to reduce output current ripple. Compared with the counterparts of conventional converter topologies, the proposed converter has merits of less component count, higher efficiency, smaller size, and they are easier to implement. Hardware measurement obtained from experimental prototype has been verified these merits. more...
- Published
- 2007
- Full Text
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24. Buck-Boost Combined with Active Clamp Flyback Converter for PV Power System
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C.-T. Hsieh, S.-Y. Tseng, J.-S. Kuo, and S.-W. Wang
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Forward converter ,Engineering ,business.industry ,Buck converter ,Flyback converter ,Ćuk converter ,Electrical engineering ,Buck–boost converter ,Converters ,law.invention ,LED lamp ,law ,Boost converter ,business - Abstract
This paper presents an LED lighting system with PV sources. The circuit of the proposed system adopts buck-boost converter associated with flyback converter to charge battery and to drive an LED lighting system. In this research, buck-boost converter is used as a charger for charging battery, and flyback converter with active clamp circuit is adopted to drive the LED lighting. To simplify the circuit structure, switches of two converters are integrated with a synchronous switch technique. With this approach, the proposed system has several merits, which are a less component count, lighter weight, smaller size and higher conversion efficiency. Compared with the conventional converter with hard-switching circuit, the proposed one can improve conversion efficiency of 5% and achieve efficiency about 83% under full load at driving the LED lighting. Experimental results obtained from a prototype with output voltage of 10 V and output power of 20 W have verified its feasibility. more...
- Published
- 2007
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25. 3-D Heat and Fluid Flow Analysis of Successively Variable Louver Angle of Louver Fin Geometry in Compact Heat Exchangers
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C. T. Hsieh and J. Y. Jang
- Subjects
Engineering drawing ,Materials science ,Heat exchanger ,Micro heat exchanger ,Fluid dynamics ,Mechanics ,Louver ,Fin (extended surface) - Published
- 2006
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26. Tomography of the Injection and Acceleration Processes of Monoenergetic Electrons in a Laser Wakefield Accelerator
- Author
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Jiunn-Yuan Lin, Y. C. Ho, Jiin-Tarng Wang, Ching-Pang Chang, C. T. Hsieh, Yen-Mu Chen, and S.-Y. Chen
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Physics ,Laser beam machining ,Particle accelerator ,Electron ,Plasma acceleration ,Laser ,Linear particle accelerator ,law.invention ,Physics::Plasma Physics ,law ,Cathode ray ,Physics::Accelerator Physics ,Atomic physics ,Beam (structure) - Abstract
A tomographic method based on laser machining was used to resolve the electron injection and acceleration processes in a laser wakefield accelerator. It was found that all the electrons in the monoenergetic electron beam are injected at the same location in the plasma column and then accelerated with an acceleration gradient exceeding 2 GeV/cm. In addition, it was observed that there is no significant deceleration of the monoenergetic electron bunch after reaching the maximum energy and the injection position shifts with change of the position of pump‐pulse focus. The results are consistent with the model of transverse wave‐breaking and beam loading for injection of monoenergetic electrons. With this method the details of the underlying physical processes in a laser wakefield accelerator can be resolved and compared directly to the observations in particle‐in‐cell simulations. more...
- Published
- 2006
- Full Text
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27. P33.17: Prenatal diagnosis of sporadic Apert syndrome with ultrasound and 3D helical computerized tomography
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C. T. Hsieh, H. Tsai, and P. Yang
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medicine.medical_specialty ,Radiological and Ultrasound Technology ,business.industry ,Ultrasound ,Obstetrics and Gynecology ,Prenatal diagnosis ,General Medicine ,Apert syndrome ,medicine.disease ,Reproductive Medicine ,medicine ,Radiology, Nuclear Medicine and imaging ,Radiology ,Tomography ,business - Published
- 2012
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28. P15.05: Prenatal diagnosis of achondroplasia with ultrasound, three-dimensional computed tomography and molecular methods
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Yao-Hsu Yang, P. Yang, H. Liao, and C. T. Hsieh
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medicine.medical_specialty ,Radiological and Ultrasound Technology ,medicine.diagnostic_test ,business.industry ,Ultrasound ,Obstetrics and Gynecology ,Prenatal diagnosis ,Computed tomography ,General Medicine ,medicine.disease ,Reproductive Medicine ,medicine ,Radiology, Nuclear Medicine and imaging ,Radiology ,Achondroplasia ,business - Published
- 2011
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29. Effect of Rhizoma Corydalis on focal cerebral infarct in ischemia-reperfusion injured rats
- Author
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E T, Liao, S Y, Chiang, C J, Lao, N Y, Tang, C T, Hsieh, and J G, Lin
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Male ,Rats, Sprague-Dawley ,Disease Models, Animal ,Neuroprotective Agents ,Corydalis ,Reperfusion Injury ,Animals ,Cerebral Infarction ,Plant Roots ,Drugs, Chinese Herbal ,Rats - Abstract
To investigate the effect of Rhizoma Corydalis (RC) on focal cerebral infarct.A total of 30 Sprague-Dawley (SD) rats were studied. Focal cerebral infarct was established b y occluding the bilateral common carotid arteries and the right middle cerebral artery for 90 min. After 24 h reperfusion, the neurological status was evaluated and then the rats were killed and the brain tissue was stained with 2,3,5-triphenyl-tetrazolium chloride. The neurological status and the changes in the area of cerebral infarct were used as an index to evaluate the effect of RC on cerebral infarct. In addition, the whole blood was examined 24 h after RC treatment in the other 24 SD rats.Pretreatment with RC 100 mg/kg can improve neurological status and also can reduce the area of cerebral infarct in ischemia-reperfusion injured rats. The counts of erythrocyte and the amount of hematocrit increased in whole blood of RC-treated rats.RC can improve neurological status and reduce the area of cerebral infarct in ischemia-reperfusion injured rats. more...
- Published
- 2001
30. Primary hyperparathyroidism and acute pancreatitis during the third trimester of pregnancy
- Author
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M K, Hong, C T, Hsieh, B H, Chen, S T, Tu, and P H, Chou
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Adult ,Parathyroidectomy ,Hyperparathyroidism ,Pregnancy Trimester, Third ,Pregnancy Outcome ,Parathyroid Glands ,Pregnancy Complications ,Pancreatitis ,Parathyroid Hormone ,Pregnancy ,Acute Disease ,Humans ,Female ,Ultrasonography - Abstract
The simultaneous occurrence of maternal primary hyperparathyroidism (PHPT) and acute pancreatitis during pregnancy is very rare. We report a case of concurrent PHPT and pancreatitis during the third trimester of pregnancy. A summary of the relevant literature regarding the clinical course and recommended management in relation to this case is also presented. more...
- Published
- 2001
31. P13.02: Prenatal diagnosis of septal dysgenesis: a report of five cases
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C. T. Hsieh
- Subjects
Pediatrics ,medicine.medical_specialty ,Dysgenesis ,Reproductive Medicine ,Radiological and Ultrasound Technology ,business.industry ,medicine ,Obstetrics and Gynecology ,Radiology, Nuclear Medicine and imaging ,Prenatal diagnosis ,General Medicine ,business - Published
- 2012
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32. P02.08: Prenatal diagnosis and outcome of dysgenesis of the corpus callosum
- Author
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C. T. Hsieh
- Subjects
Dysgenesis ,medicine.medical_specialty ,Reproductive Medicine ,Radiological and Ultrasound Technology ,business.industry ,Obstetrics ,Obstetrics and Gynecology ,Medicine ,Radiology, Nuclear Medicine and imaging ,Prenatal diagnosis ,General Medicine ,Corpus callosum ,business - Published
- 2011
- Full Text
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33. Contraband detection through clothing by means of millimeter-wave imaging
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Ellen Moore, C. T. Hsieh, John E Kapitzky, G. Richard Huguenin, Karl David Stephan, and A. S. Vickery
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business.industry ,Magnetism ,Computer science ,Optical engineering ,Radiation ,Clothing ,Reflectivity ,Ionizing radiation ,Optics ,Thermal radiation ,Extremely high frequency ,Computer vision ,Artificial intelligence ,business - Abstract
Plastic weapons and explosives concealed under clothing present unique challenges to conventional contraband detection technology. Nonmetallic, nonmagnetic objects cannot be detected by conventional systems that use low-frequency magnetic fields. Common techniques that can reveal these types of contraband involve X-rays or other ionizing radiation, which are inappropriate for use on the human body. We have found that millimeter-wavelength radiation is an excellent means for revealing objects hidden beneath clothing. Naturally occurring thermal radiation from the subject can be used in a process called passive imaging. An alternative process called active imaging uses one or more millimeter-wave sources to illuminate the subject. In this paper we describe the basic theory of millimeter-wave imaging. We present single-channel scanned images of both metal and plastic objects concealed beneath ordinary clothing. The clothing appears substantially transparent and the objects are distinguishable. The paper concludes with a discussion of prospective advances that should make multiple-channel real-time imaging systems practical.© (1993) COPYRIGHT SPIE--The International Society for Optical Engineering. Downloading of the abstract is permitted for personal use only. more...
- Published
- 1993
- Full Text
- View/download PDF
34. P09.15: Cri-du-Chat syndrome presenting with brain anomalies: antenatal ultrasound and magnetic resonance imaging features
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C. T. Hsieh and K. Hsu
- Subjects
medicine.medical_specialty ,Radiological and Ultrasound Technology ,medicine.diagnostic_test ,business.industry ,Cri du Chat Syndrome ,Obstetrics and Gynecology ,Magnetic resonance imaging ,General Medicine ,Antenatal ultrasound ,Reproductive Medicine ,medicine ,Radiology, Nuclear Medicine and imaging ,Radiology ,business - Published
- 2010
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35. Disturbance data compression of a power system using the Huffman coding approach with wavelet transform enhancement
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Shyh-Jier Huang and C.-T. Hsieh
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Engineering ,Disturbance (geology) ,business.industry ,Wavelet transform ,Data_CODINGANDINFORMATIONTHEORY ,Huffman coding ,Wavelet packet decomposition ,Electric power system ,symbols.namesake ,Voltage sag ,Electronic engineering ,symbols ,Electrical and Electronic Engineering ,business ,Algorithm ,Data compression ,Data transmission - Abstract
A Huffman coding approach enhanced with wavelet transform is applied to compress power system disturbance data. The acquired data of the disturbance signal is first decomposed into higher frequency and lower frequency components by wavelet transform. The Huffman coding technique is then used to reduce the amount of data more effectively. The data transmission and storage capability can also be enhanced. This method has been tested under disturbance scenarios that include: voltage sag, voltage swell and momentary interruption. Test results demonstrated the feasibility of the method. more...
- Published
- 2003
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36. Soft magnetic properties of Co–Fe–Zr–B–Al–O films
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Li-Hui Chen, Shih-Yun Chen, In-Gann Chen, C. T. Hsieh, Y. H. Shih, H. P. Liu, and H. K. Chen
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Magnetic anisotropy ,Magnetization ,Amorphous metal ,Nuclear magnetic resonance ,Materials science ,Condensed matter physics ,Film plane ,General Physics and Astronomy ,Coercivity ,Anisotropy ,Ferromagnetic resonance ,Amorphous solid - Abstract
We have investigated magnetic and electrical properties of amorphous Co–Fe–Zr–B alloy films with Al and O additions, deposited on rotating Si substrates by dc magnetron sputtering. Microstructural characterization carried out on these films shows the amorphous nature of films. The Co–Fe–Zr–B–Al–O films do not exhibit any uniaxial anisotropy in magnetization behavior in the as-deposited condition. However, a strong uniaxial anisotropy is introduced in the film plane by annealing at 200 °C for 2 h and in an applied field of ∼150 Oe. The observed in-plane uniaxial anisotropy field (Hk) is as high as ∼38 Oe and the easy-axis coercivity is less than 1.5 Oe for the Co–Fe–Zr–B–Al–O film with 7 at. % Al. The ferromagnetic resonance frequency reaches a high value of ∼2.05 GHz, as a result of this large anisotropy field. It is also found that the soft magnetic properties of amorphous films have a strong dependence on the film composition. This is attributed to the change in the microstructure of films, which is clo... more...
- Published
- 2002
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37. Production of the stimulated Raman lines in H_2 gas with a focused laser beam*
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C. W. Cho, N. D. Foltz, and C. T. Hsieh
- Subjects
symbols.namesake ,Materials science ,General Engineering ,symbols ,Light beam ,Laser power scaling ,Atomic physics ,Lasing threshold ,Circular polarization ,Beam (structure) ,Raman scattering ,Line (formation) ,Gain-switching - Abstract
The laser power threshold for the forward- and back-scattered Q1(1) and S0(1) stimulated Raman lines from H2 gas in the pressure range 4–40 amagats was measured for the focused-beam geometry. This work was undertaken to obtain quantitative data on the threshold power in the neighborhood of Dicke narrowing zones, and to determine the relationship between the threshold-power behavior and theoretical gains for the focused-laser-beam configuration. Our results indicate a strong dependence of the S0(1) line on laser polarization; the threshold power is a minimum for a circularly polarized beam. Threshold powers for the Q1(1) were similar for both linearly and circularly polarized laser light. The density dependence of the threshold power for both of the stimulated Raman lines was observed to be identical in both forward and backward directions. The predicted behavior of the threshold power is compared with the observed data. more...
- Published
- 1974
- Full Text
- View/download PDF
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