Article
Astronomy & Astrophysics
Keisuke Osumi, Janet L. Weiland, Graeme E. Addison, Charles L. Bennett
Summary: Using Planck polarization data, this study investigates and constrains the spatial variations of polarized dust foreground for cosmic microwave background observations. The analysis found limits on the Gaussian spatial variation in beta(d) up to 0.45 at the highest latitudes, 0.30 at midlatitudes, and 0.15 at low latitudes. Care must be taken when interpreting current Planck constraints and noise simulations, particularly in high latitude regions.
ASTROPHYSICAL JOURNAL
(2021)
Article
Materials Science, Ceramics
Yanjun Wang, Meijie Yu, Chaohui Huang, Qi Zheng, Haiping Zhou, Ze Zhang, Shengyao Zhao
Summary: In this study, AZO nanoparticles with different doping concentrations were successfully prepared by a one-step hydrothermal synthesis method, and their crystal structure, morphology, infrared absorption, infrared emission, and microwave loss properties were analyzed in detail. With the increase of the aluminum doping concentration, the grain size of AZO gradually increases, and the infrared emissivity first decreases and then increases, showing some fluctuations.
CERAMICS INTERNATIONAL
(2021)
Article
Engineering, Multidisciplinary
Connor Woodruff, Steven W. Dean, Colton Cagle, Charles Luke Croessmann, Michelle L. Pantoya
Summary: Thermal analyses were conducted on aluminum projectiles to investigate projectile impact and subsequent combustion using a high-velocity impact ignition system. Temperature measurements were compared using pyrometry and thermography, showing pyrometry is best for immediate temperature measurement while thermography quantifies temperature dissipation downstream. Three combustion stages were identified in the thermography data.
Article
Optics
Zezhan Zhang, Mengchao Chen, Lichuan Zhang, Hongzu Li, Hairui Huang, Zilong Zhang, Peifeng Yu, Yi Niu, Shan Gao, Chao Wang, Jing Jiang
Summary: Spectral emissivity is an important parameter for characterizing the radiative capacity of solid surfaces and is affected by surface morphology. This study established an estimating method for predicting the emissivity of rough surfaces of metal solids. The results show that emissivity increases with roughness, but the enhancement effect weakens with increasing roughness or emissivity.
LIGHT-SCIENCE & APPLICATIONS
(2023)
Article
Environmental Sciences
Jianwei Huang, Shanjun Liu, Wenfang Liu, Chunju Zhang, Shuiping Li, Min Yu, Lixin Wu
Summary: Different types of fracturing modes exhibit different trends in thermal infrared (TIR) radiance variation. Experimental observations show that extensional fissures lead to increased radiance with a local peak in the 8.0-9.7 µm range, while local bulging results in decreased radiance with a local valley in the same range. These changes in radiance are influenced by both temperature and emissivity variations, with the characteristic waveband relating to quartz emissivity changes.
Article
Engineering, Multidisciplinary
Hui Luo, Yao Xiong, Yongzhi Cheng, Fu Chen, Xiangcheng Li
Summary: A visible transparent metamaterial absorber was designed and fabricated with ultrabroadband microwave absorption and low infrared emissivity for multispectral compatible camouflage. The absorber, consisting of a low-infrared emissive layer, a microwave-absorbing layer, and a reflective layer, demonstrated high visible transmittance, low infrared emissivity, and effective microwave absorption. The performance of the absorber remained stable even at wide angles and different polarizations, making it suitable for various applications in multispectral camouflage.
SCIENCE CHINA-TECHNOLOGICAL SCIENCES
(2023)
Article
Instruments & Instrumentation
Yanfen Xu, Kaihua Zhang, Zhuangtao Tian, Ruirui Tong, Kun Yu, Yufang Liu
Summary: This study compares the spectral emissivity of red copper, brass, and cupronickel alloy at different oxidation temperatures, revealing the variations in emissivity with wavelength, temperature, composition, and oxidation degree. The results show oscillations in emissivity distribution for different copper alloy samples, and the calculated oxide film thickness is consistent with experimental results.
INFRARED PHYSICS & TECHNOLOGY
(2022)
Article
Engineering, Chemical
Simon Schiffer, Andreas Matyssek, Martin Hartinger, Peter Bolduan, Peter Mund, Ulrich Kulozik
Summary: This study explored the influence of the selective layer properties of ceramic multichannel microfiltration membranes on the filtration performance during milk protein fractionation. Differences in membrane performance were linked to characteristics of the selective layer material, zeta-potential, pore size distribution, and fouling resistance. Membrane flux and protein permeation were affected by the selective layer material, with materials with wider pore size distribution showing more pronounced flux decrease after acidic conditioning.
SEPARATION AND PURIFICATION TECHNOLOGY
(2021)
Article
Optics
Yingze Zhao, Jinguang Lv, Kaifeng Zheng, Jin Tao, Yuxin Qin, Weibiao Wang, Chao Wang, Jingqiu Liang
Summary: This paper introduces a narrow-band spectral window moving temperature inversion algorithm to address the issue of inaccurate emissivity presets in multispectral temperature measurements of aero-engine turbine blades. Experimental results demonstrate that the algorithm can achieve high-precision temperature field inversion.
Article
Chemistry, Physical
Aiman A. Bin Mokaizh, Jun Haslinda Shariffuddin, Abdullah O. Baarimah, Amin Al-Fakih, Abdullah Mohamed, Salem O. Baarimah, Al-Baraa Abdulrahman Al-Mekhlafi, Hamoud Alenezi, Olusegun Abayomi Olalere, Anwar Ameen Hezam Saeed
Summary: Aluminum waste-can management in Malaysia has become a significant environmental and public health issue. This study successfully synthesized high-quality alumina from the collected waste-cans using the sol-gel technique. The synthesized alumina exhibited excellent surface-area characteristics and functional properties comparable with commercially available brands.
Article
Optics
Liwei Chen, Xianqi Zhang, Shan Gao, Can Yang, Xiaokai Wei, Jing Jiang, Chao Wang, Ying Cui, Yi Niu
Summary: This paper addresses the challenges of reflected radiation interference and difficult spectral emissivity acquisition in high temperature and intense reflection environments for multi-spectral radiation temperature measurement. An analysis model using discrete triangular surface elements and radiation angle coefficients is developed to describe the variation characteristics of high temperature background reflected radiation. Additionally, an emissivity model identification algorithm based on the Alpha spectrum-Levenberg Marquarelt (LM) algorithm is proposed to overcome existing limitations in applicability and accuracy. The combined approach effectively corrects reflected radiation errors and improves temperature measurement accuracy.
Article
Energy & Fuels
Lili Yang, Yezheng Zhan, Guan Huang
Summary: Using solid particles as the working medium in concentrated solar power generation system has a promising future. This study establishes an experimental method for measuring the spectral emissivity of a single particle at high temperature and investigates the influence of particle size on emissivity.
Article
Instruments & Instrumentation
Yufeng Zhang, Yuling Wu, Wenhao Liu, Yang Wang, Yuanqing Wu
Summary: This study proposes a new antireflective coating (ARC) to improve the emission of an area blackbody. By comparing different combinations of single, dual, and triple-layer ARC materials, the double-layer ARC is found to have the best spectral emissivity. This research paves the way for designing ideal area blackbody.
INFRARED PHYSICS & TECHNOLOGY
(2022)
Article
Multidisciplinary Sciences
C. Bianchi, A. C. Marques, R. C. da Silva, T. Calmeiro, I Ferreira
Summary: A new concept of oxide-metal-oxide structures that combine photothermoelectric effect with high reflectance in the infrared and high transmittance in the visible range is presented in this study. These structures, such as the optimized ITO/Ag/ITO structure, not only show energy saving efficiency by maintaining constant temperature under solar radiation, but also exhibit a photothermoelectric effect. In addition to thermal control in windows, these low emission coatings can be utilized as transparent photothermoelectric devices.
SCIENTIFIC REPORTS
(2021)
Article
Instruments & Instrumentation
M. Sainz-Menchon, J. Gabirondo-Lopez, I. Gonzalez De Arrieta, T. Echaniz, G. A. Lopez
Summary: Directional spectral emissivity measurements were conducted on a rolled aluminum sheet in vacuum, and the results were compared to literature data and theoretical predictions. The surface state was found to play a crucial role in explaining the observed scatter of values, and the effect of the cold-rolling process on emission was studied.
INFRARED PHYSICS & TECHNOLOGY
(2022)