A Systematic Thermal Control Scheme for Microring-Based Optical Filters

2009 ◽  
Vol 21 (17) ◽  
pp. 1268-1270 ◽  
Author(s):  
Zhipeng Wang ◽  
Yung Jui Chen
Keyword(s):  
Optical Filters ◽  
Thermal Control ◽  
Control Scheme

Semi-Open Thermal Protection Scheme of Electronics in Nuclear Rescue Robot

2016 ◽  
Vol 853 ◽  
pp. 405-409
Author(s):  
Ke Sun ◽  
Yan Long Han ◽  
Wei Ling Luan
Keyword(s):  
Ambient Temperature ◽  
Thermal Protection ◽  
Working Hours ◽  
Thermal Control ◽  
Air Cooling ◽  
Rescue Robot ◽  
Protection Scheme ◽  
Control Scheme ◽  
Thermal Management Of Electronics ◽  
Forced Air

Thermal management of electronics is quite important for safe operation of nuclear rescue robot. However, the ambient temperature of the nuclear robot in the site of nuclear accident will suffer an alternation between ordinary and elevated temperature. Traditional phase change material (PCM) based closed scheme for thermal protection is not suitable due to the capacity limitation of PCM. Open scheme with forced air cooling or water cooling is not acceptable either, because it cannot operate in high temperature. Therefore, a semi-open thermal control scheme is proposed by using silica aerogel for heat insulation, PCM for heat absorption, and Nickel-titanium alloy spring as temperature switch. An investigation on different ambient temperature, laying angle, melting point of PCM and heat power is conducted. The results showed that, compared with the PCM-based closed scheme, our design can provide 19.23% prolonged safe working hours, which can improve the reliability of electronic devices.

scholarly journals Evaluating the efficiency of utilizing selectively optimized metamaterial nanostructures for passive radiative cooling of satellites and components

2019 ◽  
Vol 6 ◽  
pp. 110-123
Author(s):  
Federico Moreno ◽  
Swapnil Poudyal ◽  
Otto Cranwell ◽  
Ben Andrew
Keyword(s):  
Meta Analysis ◽  
Inductive Reasoning ◽  
Visible Spectrum ◽  
Optical Filters ◽  
Thermal Control ◽  
Cooling Power ◽  
Radiative Cooling ◽  
Temperature Sensitive ◽  
Selective Absorption ◽  
Nanophotonic Structures

The need for efficient, smart radiators and thermal control technologies will be imperative to ensure the longevity of satellites and for carrying out temperature sensitive operations in space. Advancement in nanofabrication techniques has brought about the ability to create metamaterial nanostructures and selectively control their optical properties so that they reflect better in the visible spectrum and strongly emit in the infrared spectrum, which allows for better cooling. This meta-analysis looks at contemporary research that has utilised metamaterial nanostructures for passive radiative cooling attempting to identify the cooling trends among these structures. The absorbance, emissivity and reflection spectra of these structures are compared, and their effectiveness compared to conventional coolant coatings is critiqued upon. The defining thermodynamic parameters for this study were radiative cooling power and temperature reduction. Through inductive reasoning, we predict that the emissivity in the infrared of a pyramidal layered structure of Al2O3, TiO2 and SiO2 can outperform current material choices. Improving efficiency with the prediction outlined can provide increased radiative cooling. Keywords: Passive radiative cooling; thermal radiation; metamaterials; broadband optical filters; selective absorption and emission; two-dimensional thin film coatings; nanophotonic structures

Performance Evaluation of Thermal Interface Material for Space Applications

2011 ◽  
Vol 110-116 ◽  
pp. 135-141 ◽  
Author(s):  
Jigar Gandhi ◽  
A. V. Pathak
Keyword(s):  
Experimental Studies ◽  
Thermal Control ◽  
Thermal Interface Material ◽  
Space Applications ◽  
Thermal Interface ◽  
Valuable Data ◽  
Control Scheme ◽  
The Many ◽  
Interface Materials ◽  
Insight Into

Thermal interface material is one of the many tools often used as part of the thermal control scheme for space-based applications. An experimental investigation was conducted to better understand the effect of graphite based thermal interface material under vacuum condition. The heat transfer ability of different interface materials was evaluated. Theoretical and experimental studies have yielded valuable data which provide an insight into the complexity of the problem and a better understanding for future development.

Scanning-probe microscope analysis of optical thin films: A new analytical tool in a manufacturing environment

1994 ◽  
Vol 52 ◽  
pp. 1068-1069
Author(s):  
S. P. Sapers ◽  
R. Clark ◽  
P. Somerville
Keyword(s):  
Thin Film ◽  
Thin Films ◽  
Thermal Control ◽  
Scanning Probe Microscope ◽  
Scanning Probe ◽  
List Type ◽  
Manufacturing Environment ◽  
Physical Measurements ◽  
Probe Microscope

OCLI is a leading manufacturer of thin films for optical and thermal control applications. The determination of thin film and substrate topography can be a powerful way to obtain information for deposition process design and control, and about the final thin film device properties. At OCLI we use a scanning probe microscope (SPM) in the analytical lab to obtain qualitative and quantitative data about thin film and substrate surfaces for applications in production and research and development. This manufacturing environment requires a rapid response, and a large degree of flexibility, which poses special challenges for this emerging technology. The types of information the SPM provides can be broken into three categories:(1)Imaging of surface topography for visualization purposes, especially for samples that are not SEM compatible due to size or material constraints;(2)Examination of sample surface features to make physical measurements such as surface roughness, lateral feature spacing, grain size, and surface area;(3)Determination of physical properties such as surface compliance, i.e. “hardness”, surface frictional forces, surface electrical properties.

Adaptive Control Scheme for Coupled Tank Process

2018 ◽  
pp. 89-95
Author(s):  
Vinodhini M.
Keyword(s):  
Adaptive Control ◽  
Nonlinear Behaviour ◽  
Simulation Studies ◽  
Input Output ◽  
Control Scheme ◽  
Direct Model ◽  
Multivariable Process ◽  
Model Reference Adaptive ◽  
Siso System ◽  
Adaptive Control Scheme

The objective of this paper is to develop a Direct Model Reference Adaptive Control (DMRAC) algorithm for a MIMO process by extending the MIT rule adopted for a SISO system. The controller thus developed is implemented on Laboratory interacting coupled tank process through simulation. This can be regarded as the relevant process control in petrol and chemical industries. These industries involve controlling the liquid level and the flow rate in the presence of nonlinearity and disturbance which justifies the use of adaptive techniques such as DMRAC control scheme. For this purpose, mathematical models are obtained for each of the input-output combinations using white box approach and the respective controllers are developed. A detailed analysis on the performance of the chosen process with these controllers is carried out. Simulation studies reveal the effectiveness of proposed controller for multivariable process that exhibits nonlinear behaviour.

A Study on Concurrency Control Scheme for Scalability of Blockchain

2020 ◽  
Vol 20 (3) ◽  
pp. 71-78
Author(s):  
Yong-Hyeog Kang ◽  
◽  
Wonhyung Park
Keyword(s):  
Concurrency Control ◽  
Control Scheme
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