scholarly journals Used For Space Irradiation Environment Simulation Equipment Property Analysis of Metal Mirror

2021 ◽  
Vol 2083 (2) ◽  
pp. 022023
Author(s):  
Danyi Wang ◽  
Shanping Jiang ◽  
Pengsong Zhang ◽  
Yanhong Xiang ◽  
Hongsong Li ◽  
...  
Keyword(s):  
Performance Analysis ◽  
Thermal Environment ◽  
Influence Factors ◽  
Solar Irradiation ◽  
Radiation Environment ◽  
Test Results ◽  
Solar Simulator ◽  
Systematic Analysis ◽  
Environment Simulation ◽  
Solid Foundation

Abstract With the development of space science and technology, the requirements of spacecraft environment simulation tests are gradually increasing, and radiation environment simulation has also attracted much attention. Based on space radiation environment simulation equipment of vertical metal reflector material in the solar simulator performance analysis, the systematic analysis of the influence factors of metal reflector, aimed at straight metal mirror blank material performance analysis, including the mechanics analysis and optical analysis, the performance to the blank material for testing. The test results show that the aluminum alloy 6061T6 billet used in the metal mirror can meet the requirements of high irradiation vertical solar simulator, and lay a solid foundation for the subsequent solar irradiation simulation, space illumination simulation and spacecraft thermal environment simulation.

scholarly journals Novel Structure and Thermal Design and Analysis for CubeSats in Formation Flying

Aerospace ◽  
2021 ◽  
Vol 8 (6) ◽  
pp. 150
Author(s):  
Yeon-Kyu Park ◽  
Geuk-Nam Kim ◽  
Sang-Young Park
Keyword(s):  
Analytical Model ◽  
Formation Flying ◽  
Thermal Environment ◽  
Thermal Analyses ◽  
Thermal Design ◽  
Analytical Models ◽  
Test Results ◽  
Solar Panels ◽  
Novel Structure ◽  
Micro Propulsion

The CANYVAL-C (CubeSat Astronomy by NASA and Yonsei using a virtual telescope alignment for coronagraph) is a space science demonstration mission that involves taking several images of the solar corona with two CubeSats—1U CubeSat (Timon) and 2U CubeSat (Pumbaa)—in formation flying. In this study, we developed and evaluated structural and thermal designs of the CubeSats Timon and Pumbaa through finite element analyses, considering the nonlinearity effects of the nylon wire of the deployable solar panels installed in Pumbaa. On-orbit thermal analyses were performed with an accurate analytical model for a visible camera on Timon and a micro propulsion system on Pumbaa, which has a narrow operating temperature range. Finally, the analytical models were correlated for enhancing the reliability of the numerical analysis. The test results indicated that the CubeSats are structurally safe with respect to the launch environment and can activate each component under the space thermal environment. The natural frequency of the nylon wire for the deployable solar panels was found to increase significantly as the wire was tightened strongly. The conditions of the thermal vacuum and cycling testing were implemented in the thermal analytical model, which reduced the differences between the analysis and testing.

scholarly journals Evaluation of Bleeding Resistance in Chip Seal and Asphalt Emulsion Residue Rheology

Coatings ◽  
2019 ◽  
Vol 9 (10) ◽  
pp. 670
Author(s):  
Preeda Chaturabong
Keyword(s):  
Influence Factors ◽  
Application Rate ◽  
Test Methods ◽  
Test Results ◽  
Asphalt Emulsion ◽  
Aggregate Gradation ◽  
Factors Affecting ◽  
Promising Tool ◽  
Chip Seal ◽  
Asphalt Emulsions

Chip seal bleeding is influenced by many factors, including design inputs, material properties, and project-specific conditions. It reduces the surface texture of the pavement and thus compromises the safety of the traveling public. Even though factors that bring about premature bleeding are known, currently, no laboratory test methods for evaluating bleeding in chip seals have been specified. The objective of this paper is to present the results of an investigation of the influence factors of asphalt emulsion residue properties measured by the ASTM D7405 multiple stress creep and recovery (MSCR) test, as well as other factors related to chip seal bleeding resistance as measured by the modified loaded wheel test (MLWT). In this study, the MSCR test was used as a tool for evaluating the performance of asphalt emulsions because it has been identified as a potential test related to bleeding in the field. In addition, MLWT was selected as a tool for evaluating chip seal bleeding performance in the laboratory. The results of the MLWT showed that the emulsion application rate (EAR), aggregate gradation, and emulsion properties were significant factors affecting bleeding. The MSCR test was found to be a promising tool for the performance evaluation of asphalt emulsion residue, as the test was able to differentiate between emulsion chemistries and modifications in terms of sensitivity to both temperature and stress. In relation to chip seal bleeding resistance, only the creep compliance (Jnr) obtained from the MSCR test results was identified as a significant property affecting potential for bleeding.

Performance Analysis of the Test Results on a Two-Stage Transonic Fan

1983 ◽  
Vol 105 (1) ◽  
pp. 125-129
Author(s):  
Baoshi Chen ◽  
Tianyi Zhang
Keyword(s):  
Mach Number ◽  
Performance Analysis ◽  
Radial Distribution ◽  
Flow Separation ◽  
High Load ◽  
Test Results ◽  
Two Stage ◽  
Stall Margin ◽  
High Incidence ◽  
Transonic Fan

Test results obtained from a two-stage fan are analysed and the reasons that caused the design performance target not to be attained are presented in this paper. Addition of a partspan shroud on rotor 1 caused higher losses and changed radial distribution of parameters. Modification on the flowpath and chord length of stator 1 resulted in excessively high inlet Mach number and flow separation in the hub region. The high load and high incidence at the hub of rotor 2 caused higher losses and reduced stall margin of the fan.

scholarly journals Genome-wide identification and expression analysis of the VQ gene family in Cicer arietinum and Medicago truncatula

PeerJ ◽  
2020 ◽  
Vol 8 ◽  
pp. e8471 ◽  
Author(s):  
Lei Ling ◽  
Yue Qu ◽  
Jintao Zhu ◽  
Dan Wang ◽  
Changhong Guo
Keyword(s):  
Cicer Arietinum ◽  
Medicago Truncatula ◽  
Stress Responses ◽  
Pcr Analysis ◽  
Biotic And Abiotic Stress ◽  
Systematic Analysis ◽  
Genome Wide ◽  
Specific Proteins ◽  
Solid Foundation ◽  
In Silico Analyses

Valine-glutamine (VQ) proteins are plant-specific proteins that play crucial roles in plant development as well as biotic and abiotic stress responses. VQ genes have been identified in various plants; however, there are no systematic reports in Cicer arietinum or Medicago truncatula. Herein, we identified 19 and 32 VQ genes in C. arietinum and M. truncatula, respectively. A total of these VQ genes were divided into eight groups (I–VIII) based on phylogenetic analysis. Gene structure analyses and motif patterns revealed that these VQ genes might have originated from a common ancestor. In silico analyses demonstrated that these VQ genes were expressed in different tissues. qRT-PCR analysis indicated that the VQ genes were differentially regulated during multiple abiotic stresses. This report presents the first systematic analysis of VQ genes from C. arietinum and M. truncatula and provides a solid foundation for further research of the specific functions of VQ proteins.

Concentration Performance Analysis of Solar Simulator Based on Compound Parabolic Concentrator

2020 ◽  
Vol 49 (12) ◽  
pp. 1-10
Author(s):  
王昊 Hao WANG ◽  
付跃刚 Yue-gang FU ◽  
张国玉 Guo-yu ZHANG ◽  
孙高飞 Gao-fei SUN ◽  
刘石 Shi LIU ◽  
...  
Keyword(s):  
Performance Analysis ◽  
Solar Simulator ◽  
Compound Parabolic Concentrator

scholarly journals Photo-Fenton Degradation of Pentachlorophenol: Competition between Additives and Photolysis

Nanomaterials ◽  
2019 ◽  
Vol 9 (8) ◽  
pp. 1157 ◽  
Author(s):  
Erika Pia Vergura ◽  
Sara Garcia-Ballestreros ◽  
Rosa Francisca Vercher ◽  
Lucas Santos-Juanes ◽  
Alessandra Bianco Prevot ◽  
...  
Keyword(s):  
Crucial Role ◽  
Process Efficiency ◽  
Solar Irradiation ◽  
Fenton Process ◽  
Solar Simulator ◽  
Urban Waste ◽  
Ph Values ◽  
Degradation Rates ◽  
Positive Effect

In the present work, the photo-Fenton degradation of pentachlorophenol (PCP, 1 mg/L) has been studied under simulated and natural solar irradiation; moreover, the effect on the process efficiency of urban waste-derived soluble bio-based substances (SBO), structurally comparable to humic acids, has been investigated. Experiments showed a crucial role of PCP photolysis, present in the solar pilot plant and hindered by the Pyrex® filter present in the solar simulator. Indeed, the SBO screen negatively affects PCP degradation when working under natural solar light, where the photolysis of PCP is relevant. In contrast, in the absence of PCP photolysis, a significant improvement of the photo-Fenton process was observed when added to SBO. Furthermore, SBO were able to extend the application of the photo-Fenton process at circumneutral pH values, due to their ability to complex iron, avoiding its precipitation as oxides or hydroxides. This positive effect has been observed at higher concentration of Fe(II) (4 mg/L), whereas at 1 mg/L, the degradation rates of PCP were comparable in the presence and absence of SBO.

scholarly journals The Process of Landscape Design and Maintenance Using Thermal Environment Simulation at Passive Town Kurobe

2019 ◽  
Vol 12 (0) ◽  
pp. 33-36
Author(s):  
Akinobu MURAKAMI ◽  
Eiko KUMAKURA ◽  
Hiroki TAKAHASHI ◽  
Shunsaku MIYAGI ◽  
Kazuaki NAKAOKUBO
Keyword(s):  
Thermal Environment ◽  
Landscape Design ◽  
Environment Simulation

Carbonation Experimental Study on Thermal Insulation Glazed Hollow Bead Concrete

2013 ◽  
Vol 639-640 ◽  
pp. 325-328
Author(s):  
Yan Jia Guo ◽  
Zhu Li ◽  
Yuan Zhen Liu ◽  
Shang Song Qin
Keyword(s):  
Thermal Conductivity ◽  
Thermal Insulation ◽  
Raw Materials ◽  
Influence Factors ◽  
Intensity Level ◽  
Construction Technology ◽  
Test Results ◽  
Ordinary Concrete ◽  
The Impact ◽  
Better Than

Based on the compressive strength, the thermal conductivity, the elastic modulus and the steel bond strength of thermal insulation glazed hollow bead concrete, referring to the carbonation mechanism and the influence factors of the ordinary concrete, considering the impact of raw materials and the influence of construction technology, the study on thermal insulation glazed hollow bead concrete anti-carbonation was proposed. From the test results, it can conclude that for the same intensity level, the anti-carbonation capacity of the thermal insulation glazed hollow bead concrete is better than that of the ordinary concrete. For different strength grade of thermal insulation glazed hollow bead concrete, to some extend, the higher the intensity level is, the stronger the ability of thermal insulation glazed hollow bead concrete anti-carbonation is.

Design and Performance Analysis of Automatic Solar Tracking System

2015 ◽  
Vol 793 ◽  
pp. 353-357
Author(s):  
F.S. Abdullah ◽  
H.M. Nuhafiz ◽  
O. Mardianaliza ◽  
A. Yusof ◽  
Noor Anida
Keyword(s):  
Performance Analysis ◽  
Power Supply ◽  
Electronic Circuit ◽  
Tracking System ◽  
Solar Panel ◽  
Solar Irradiation ◽  
Dc Motors ◽  
Solar Tracking ◽  
Solar Tracker ◽  
And Performance

Solar tracker is a device that detects the movement of the sun. Solar tracker receive maximum sun ray in order to produce the maximum power supply by the photovoltaic (PV) panels system. It also depends on the environment factor such as solar irradiation and temperature of the panels. This paper presents the development of the automatic solar tracking system, the construction of the sensor circuit, programming of the control system and also its performance analysis. This automatic solar tracking system is designed with an electronic circuit control using PIC that can trigger the dc motors when the LDR sensors detect sunlight. DC motor will move vertical and 360 ̊ horizontal to increase efficiency of sunlight to the solar panel. Solar panel for the project gets power supply from the battery. The battery will be charged using power from the solar panel.

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