Thermal Modeling and Luminosity Characterization of a Plasma Display Panel

2007 ◽  
Author(s):  
Jeffry Kahn ◽  
Avram Bar-Cohen
Keyword(s):  
Heat Generation ◽  
Thermal Model ◽  
Temporal Variations ◽  
High Definition ◽  
3 Dimensional ◽  
Beneficial Effects ◽  
Large Size ◽  
Plasma Display ◽  
Graphite Heat ◽  
Color Analyzer

Plasma Display Panels (PDPs) are a popular technology for large size television displays. Screen inefficiencies, which result in significant localized heat generation, necessitate the use of advanced thermal management materials to reduce both the peak temperatures and the spatial temperature variations across the screen. In the current study, infrared thermography was used to obtain thermal maps of a typical, 42", high-definition PDP screen for different illumination patterns and for several configurations of externally controlled heaters, simulating PDP heat generation. The results were used to validate a 3-dimensional numerical thermal model of the PDP which was then used to predict the beneficial effects of anisotropic graphite heat spreaders on the temperature distribution of the PDP. In addition, a color analyzer was used to determine the spatial and temporal variations in luminosity across the PDP when operated continuously for 1750 hours with different illumination patterns. The thermal model and experimental luminosity characteristics are used to evaluate the deleterious effects of temperature on PDP performance.

scholarly journals High-Definition and 3-dimensional Imaging of Macular Pathologies with High-speed Ultrahigh-Resolution Optical Coherence Tomography

Ophthalmology ◽  
2006 ◽  
Vol 113 (11) ◽  
pp. 2054-2065.e3 ◽  
Author(s):  
Vivek J. Srinivasan ◽  
Maciej Wojtkowski ◽  
Andre J. Witkin ◽  
Jay S. Duker ◽  
Tony H. Ko ◽  
...  
Keyword(s):  
Optical Coherence Tomography ◽  
High Speed ◽  
Optical Coherence ◽  
High Definition ◽  
Ultrahigh Resolution ◽  
3 Dimensional

Development of Advanced Mechanical System for 3-D Full-Scale Earthquake Testing Facility

2002 ◽  
Author(s):  
Shintaro Watanabe ◽  
Kazuhiko Maekawa ◽  
Yasuyuki Tanaka ◽  
Akesi Koike ◽  
Yukiharu Yamasaki
Keyword(s):  
Full Scale ◽  
Shaking Table ◽  
Test Facility ◽  
Wave Form ◽  
Low Friction ◽  
3 Dimensional ◽  
Large Size ◽  
Testing Facility ◽  
Ring Seal ◽  
Hyogo Prefecture

The largest 3-dimensional vibration test facility is being constructed in Japan’s Hyogo Prefecture. The objective of this facility is to assist the investigation on the process of the collapsing phenomena of a full-scale structure in an earthquake. This facility has a large size shaking table (15 m × 20 m), with a payload of 12 MN. Actuators are connected to the shaking table via 3-D links. In order to reduce the distortion of accelaration wave form, low friction tribo-elements are employed in the actuators; a hydrostatic bearing for rod supports, a pressure balanced seal for pistons, a floating ring seal for 3-dimensional joints. Since these elements are large and heavily loaded, the deformation of them are relatively large compared to the oil film gap in the elements and make design difficult. The paper exhibits the tribological performance of the actuators and joints.

Skills Comparison in Pediatric Residents Using a 2-Dimensional versus a 3-Dimensional High-Definition Camera in a Pediatric Laparoscopic Simulator

2017 ◽  
Vol 74 (4) ◽  
pp. 644-649 ◽  
Author(s):  
Riccardo Guanà ◽  
Luisa Ferrero ◽  
Salvatore Garofalo ◽  
Alessia Cerrina ◽  
Davide Cussa ◽  
...  
Keyword(s):  
High Definition ◽  
Pediatric Residents ◽  
3 Dimensional ◽  
Laparoscopic Simulator

An integrated model for high-speed motorized spindles – Dynamic behaviors

2013 ◽  
Vol 227 (11) ◽  
pp. 2467-2478 ◽  
Author(s):  
Xiao-an Chen ◽  
Jun-feng Liu ◽  
Ye He ◽  
Peng Zhang ◽  
Wen-tao Shan
Keyword(s):  
Dynamic Model ◽  
Heat Generation ◽  
Thermal Model ◽  
High Speed ◽  
High Efficiency ◽  
Solution Procedure ◽  
Integrated Model ◽  
Dynamic Behaviors ◽  
Dynamic Performances ◽  
Motorized Spindles

With increasing popularity in high-speed machining due to its high efficiency, there is a vital need for more accurate prediction of dynamic behaviors for high-speed motorized spindles. The spindle units integrate tools with built-in motors hence a comprehensive model is required to include the multi-physics coupling property. This article presents an integrated model which consists of four coupled sub-models: state, shaft, bearing, and thermal model. Using the variational principle, a state model for the motor-spindle system is generated, which can describe the running state of the spindle, and provide electrical parameters to study the motor heat generation for thermal model and the unbalanced magnetic force for shaft dynamic model. The thermal model is coupled with the bearing and shaft dynamic model through bearing heat generation and thermal displacement. Thus, the entire model becomes an integrated electro-thermo-mechanical dynamic model. The proposed integrated model is investigated by a solution procedure and validated experimentally, and it shows that the model is capable of accurately predicting the dynamic behaviors of motorized spindles. The coupling relationship among the electrical, thermal, and mechanical behaviors of the system becomes clear from the simulation and experimental results, and some feasible methods to improve the dynamic performances of the system are obtained.

Influence of Internal Resistance on Temperature Rising of Cylindrical Ni-MH Batteries

2013 ◽  
Vol 303-306 ◽  
pp. 2758-2761
Author(s):  
Mao De Li ◽  
Yi Li ◽  
Wei Wei
Keyword(s):  
Thermal Management ◽  
Heat Generation ◽  
Thermal Model ◽  
Internal Resistance ◽  
Operating Conditions ◽  
Resistance Curve ◽  
Battery Thermal Management ◽  
Fitting Method ◽  
Basic Reference ◽  
Mh Battery

The internal resistance of the six Ni-MH batteries are obtained by experiment, furthermore get resistance curve using polynomial fitting method. This article commits itself to take the variation of the operating conditions into account to obtain the overall temperature rising curve and the temperature profile based on battery thermal model. The temperature rising results under different battery resistance models (R=C and R= f(t)) are compared. It is useful to provide basic reference for further study in Ni-MH battery heat generation characteristics and the improvement for battery thermal management.

A Multi-Dimensional Coupled Electro-Thermal Model of a LFP Battery

2012 ◽  
Vol 569 ◽  
pp. 386-390
Author(s):  
Hong Zhang Cen ◽  
Xue Zhe Wei ◽  
Hai Feng Dai ◽  
Li Song
Keyword(s):  
Temperature Distribution ◽  
Heat Generation ◽  
Thermal Model ◽  
Porous Electrode ◽  
Generation Rate ◽  
Heat Generation Rate ◽  
Battery Model ◽  
Model Based ◽  
D Model

In this article a multi-dimensional coupled electro-thermal model of a LFP battery is proposed. The model includes a 1-d model based on porous-electrode theory and a 3-d battery model solving the temperature distribution of the battery. These models are coupled through heat generation rate during discharging process. Moreover, an experiment is designed to check the inside temperature information of the battery.

Development of a Low-Noise and High-Performance Cooling Structure for Full-HD Plasma Display TV Sets

2009 ◽  
Author(s):  
Nobuyuki Isoshima ◽  
Masatoshi Watanabe ◽  
Mika Ri ◽  
Yutaka Yamada ◽  
Koichi Sugimoto
Keyword(s):  
Low Temperature ◽  
High Performance ◽  
Rotation Speed ◽  
Low Noise ◽  
Output Level ◽  
Plasma Display Panel ◽  
High Definition ◽  
Cooling Fans ◽  
Plasma Display ◽  
Conventional Structure

A low-noise and high-performance “inclined fan-blowing-upward structure” for full high definition plasma display panel television sets was developed by using computational fluid dynamics with heat transfer based on a Cartesian grid system. In the conventional structure, the plasma panel and boards are cooled by fans and upward flow induced by natural convection. However, simulation results indicated that low-temperature flows between the bottom and rear inlets and fans are formed along the back cover, and the flows are not sufficiently supplied to the plasma panel and address-driver modules. Our solution is to mount the cooling fans inclined to the plasma panel so that the flows produced by the fans impinge on the panel to supply the low-temperature air to the panel and address-driver modules directly. In the new structure, larger fans can be used because fans are mounted inclined. With the larger fans, the rotation speed of the fans can be reduced, and the flow rate is increased. The experimental results show that the temperature of the panel and address-driver modules decreases respectively 3C and 8C at the same noise output level.

Initial Experience with 3-Dimensional Exoscope-Assisted Transmastoid and Lateral Skull Base Surgery

2019 ◽  
Vol 160 (2) ◽  
pp. 364-367 ◽  
Author(s):  
Sullivan Smith ◽  
Elliott D. Kozin ◽  
Vivek V. Kanumuri ◽  
Samuel R. Barber ◽  
Douglas Backous ◽  
...  
Keyword(s):  
Visual Experience ◽  
Skull Base Surgery ◽  
Perioperative Complications ◽  
Surgical Approaches ◽  
Operating Microscope ◽  
Proof Of Concept ◽  
High Definition ◽  
3 Dimensional ◽  
Lateral Skull Base ◽  
Compact Size

Extracorporeal video microscopes, or “exoscopes,” provide high-definition views of the operative field and are alternatives to the operating microscope or loupes for large-corridor surgical approaches. In this proof-of-concept study, we aim to determine the feasibility of 3-dimensional exoscopes as alternatives to operating microscopes in otology and neurotology, espeically in conjunction with endoscopes. Eleven consecutive cases were performed using 3-dimensional exoscopes in place of, or as adjuncts to, the operating microscope. The exoscope was the sole visualization tool in 7 cases, with 4 including the use of an endoscope or microscope. There were no perioperative complications. Potential subjective advantages include superior ergonomics, compact size, and an equal visual experience for surgeons and observers. Limitations include low lighting in small surgical corridors and pixilation at high magnification. Exoscopes are potentially viable alternatives to the microscope in otologic and neurotologic surgery.

Minimally Invasive Navigated Foraminal Discectomy via Contralateral Approach Using a 3-Dimensional 4K High-Definition Exoscope: 2-Dimensional Operative Video

2019 ◽  
Vol 19 (2) ◽  
pp. E188-E188
Author(s):  
Jonathan Oren ◽  
Kevin Kwan ◽  
Julia Schneider ◽  
Mitchell Levine ◽  
David Langer
Keyword(s):  
Informed Consent ◽  
Minimally Invasive ◽  
Invasive Technique ◽  
High Definition ◽  
High Quality ◽  
Tubular Retractor ◽  
3 Dimensional ◽  
Intraoperative Fluoroscopy ◽  
Disc Herniations ◽  
Operative Microscope

Abstract This surgical video is the first to demonstrate a novel minimally invasive technique of utilization of surgically navigated foraminal discectomy using a 3-dimensional 4k high-definition exoscope (Sony Olympus). Typical approaches for foraminal disc herniations may involve violation of the facet resulting in subsequent destabilization requiring fusion.1 Although minimally invasive facet-sparing contralateral techniques have previously been described,2 there is continued limitations stemming from rudimentary localization with standard fluoroscopy and impaired visualization with the bulky traditional operative microscope.3 We demonstrate that high-quality real-time navigation is possible using standard Iso-C intraoperative fluoroscopy for 3-dimensional reconstructions, allowing for intraoperative routing. Navigation is particularly advantageous for adjustments in the trajectory of the tubular retractor and for confirmation of complete foraminal decompression. Visualization from the 4k high-definition exoscope also allows for an unparalleled view of the narrow operative corridor and allows for participation from the operative team. Informed consent was obtained from the patient for the surgery in its entirety.

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