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Journal articles on the topic 'Radiative proce'

Author: Grafiati

Published: 9 March 2023

Last updated: 31 July 2025

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1

Yang, Guangwei, Jianying Li, Jiangjun Yang, and Zijian Xing. "Dual-band slot microstrip patch antennas with dual-radiation modes for wireless communication." International Journal of Microwave and Wireless Technologies 12, no. 2 (2019): 155–62. http://dx.doi.org/10.1017/s1759078719001065.

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AbstractIn this paper, a novel compact dual-band microstrip patch antenna with dual-radiation modes is investigated. The proposed antenna consists of a rectangular ground plane, a U-shaped feed probe, and an H-shaped slot radiating patch. By adjusting the size of these structures, a dual-band antenna can be obtained. In the low-frequency band, the antenna can radiate one radiation beam with high gain. In the high-frequency band, the antenna can achieve monopole-like radiation pattern. Therefore, an antenna prototype is fabricated and measured for validation. Good agreement between the simulate

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BALUGIN, N. V., B. A. FOMIN, A. D. LYKOV, and V. A. YUSHKOV. "ESTIMATION OF STRATOSPHERIC AEROSOL EFFECTS ON STRATOSPHERIC RADIATION BUDGET ACCORDING TO OPTICAL BALLOON BACKSCATTER PROBE AND RADIATION MODELING." Meteorologiya i Gidrologiya, no. 10 (October 2022): 121–29. http://dx.doi.org/10.52002/0130-2906-2022-10-121-129.

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A method for evaluating stratospheric aerosol effects on the stratospheric radiation budget according to balloon sounding with an optical aerosol backscatter probe is presented. It is shown for the sounding in the equatorial zone under conditions of perturbed aerosol filling of the stratosphere that observed changes in the composition of stratospheric aerosol lead to significant changes (2-3-fold) in radiative heating. The evaluation technique is based on using the radiative (line-by-line and Monte Carlo) model of solar radiation transfer and can be especially useful in case of episodical pert

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Le Gouellec, Valentin J. M., B.-G. Andersson, Archana Soam, et al. "The Origin of Dust Polarization in the Orion Bar." Astrophysical Journal 951, no. 2 (2023): 97. http://dx.doi.org/10.3847/1538-4357/accff7.

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Abstract The linear polarization of thermal dust emission provides a powerful tool to probe interstellar and circumstellar magnetic fields, because aspherical grains tend to align themselves with magnetic field lines. While the Radiative Alignment Torque (RAT) mechanism provides a theoretical framework for this phenomenon, some aspects of this alignment mechanism still need to be quantitatively tested. One such aspect is the possibility that the reference alignment direction changes from the magnetic field (“B-RAT”) to the radiation field k-vector (“k-RAT”) in areas of strong radiation fields.

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Chaulagain, U., C. Stehlé, P. Barroso, et al. "Target Design for XUV Probing of Radiative Shock Experiments." Journal of Nepal Physical Society 6, no. 1 (2020): 30–41. http://dx.doi.org/10.3126/jnphyssoc.v6i1.30514.

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Radiative shocks are strong shocks characterized by plasma at a high temperature emitting an important fraction of its energy as radiation. Radiative shocks are commonly found in many astrophysical systems and are templates of radiative hydrodynamic flows, which can be studied experimentally using high-power lasers. This is not only important in the context of laboratory astrophysics but also to benchmark numerical studies. We present details on the design of experiments on radiative shocks in xenon gas performed at the kJ scale PALS laser facility. It includes technical specifications for the

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Coffing, Shane X., Chris L. Fryer, Harry F. Robey, et al. "Inferring the temperature profile of the radiative shock in the COAX experiment with shock radiography, Dante, and spectral temperature diagnostics." Physics of Plasmas 29, no. 8 (2022): 083302. http://dx.doi.org/10.1063/5.0081167.

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Predicting and modeling the behavior of experiments with radiation waves propagating through low-density foams require a detailed quantification of the numerous uncertainties present. In regimes where a prominent radiative shock is produced, key dynamical features include the shock position, temperature, and curvature and the spatial distribution and temperature of the corresponding supersonic radiation wave. The COAX experimental platform is designed to constrain numerical models of such a radiative shock propagating through a low-density foam by employing radiography for spatial and shock in

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Tiranov, Alexey, Vasiliki Angelopoulou, Cornelis Jacobus van Diepen, et al. "Collective super- and subradiant dynamics between distant optical quantum emitters." Science 379, no. 6630 (2023): 389–93. http://dx.doi.org/10.1126/science.ade9324.

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Photon emission is the hallmark of light-matter interaction and the foundation of photonic quantum science, enabling advanced sources for quantum communication and computing. Although single-emitter radiation can be tailored by the photonic environment, the introduction of multiple emitters extends this picture. A fundamental challenge, however, is that the radiative dipole-dipole coupling rapidly decays with spatial separation, typically within a fraction of the optical wavelength. We realize distant dipole-dipole radiative coupling with pairs of solid-state optical quantum emitters embedded

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Frolec, J., T. Kralik, B. Bras, and M. Portaluppi. "A cryogenic method for testing thermal radiative properties of surfaces for space probes." IOP Conference Series: Materials Science and Engineering 1287, no. 1 (2023): 012023. http://dx.doi.org/10.1088/1757-899x/1287/1/012023.

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Abstract We present a cryogenic method for testing of thermal radiative properties of materials commonly used in ground-based systems as well as for space probes. It is possible to measure total hemispherical emissivity or absorptivity of metallic or dielectric surfaces (0.1% - 100%) in the range of temperatures from 10 K up to 320 K of the source of thermal radiation. Emissivity of thermal control coatings for the space probe JUICE are presented together with other materials used for space exploration or cryogenics.

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Keeler, Jason M., Brian F. Jewett, Robert M. Rauber, et al. "Dynamics of Cloud-Top Generating Cells in Winter Cyclones. Part I: Idealized Simulations in the Context of Field Observations." Journal of the Atmospheric Sciences 73, no. 4 (2016): 1507–27. http://dx.doi.org/10.1175/jas-d-15-0126.1.

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Abstract This paper assesses the influence of radiative forcing and latent heating on the development and maintenance of cloud-top generating cells (GCs) in high-resolution idealized Weather Research and Forecasting Model simulations with initial conditions representative of the vertical structure of a cyclone observed during the Profiling of Winter Storms campaign. Simulated GC kinematics, structure, and ice mass are shown to compare well quantitatively with Wyoming Cloud Radar, cloud probe, and other observations. Sensitivity to radiative forcing was assessed in simulations with longwave-onl

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Akdagli, Ali, and Abdurrahim Toktas. "Design of wideband orthogonal MIMO antenna with improved correlation using a parasitic element for mobile handsets." International Journal of Microwave and Wireless Technologies 8, no. 1 (2014): 109–15. http://dx.doi.org/10.1017/s1759078714001263.

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In this paper, a novel design of compact wideband multiple-input multiple-output (MIMO) antenna operating over a frequency range of 1.8–4.0 GHz at 10 dB is presented for mobile terminals. The MIMO antenna design consists of two symmetrical and orthogonal radiating elements with a small size of 15.5 × 16.5 mm2 printed on the corners of a mobile circuit board. The radiating element is composed of four meandered monopole branches with a strip-line fed by a probe. By triangularly trimming the corners of the common ground plane beneath the radiating elements, not only the mutual coupling is reduced

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Savard, N., G. Fubiani, and M. Dehnel. "Comparison of Langmuir probe and optical emission spectroscopy on a volume-cusp filament ion source using helium." Review of Scientific Instruments 93, no. 10 (2022): 103303. http://dx.doi.org/10.1063/5.0092156.

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D-Pace has a Penning ion source that runs with helium for studies of α-particle production. We want to study its plasma properties as a function of varying operational parameters, which results in varied output ion beam characteristics. In order to diagnose the ion source plasma, a collisional-radiative code for helium to be used with optical emission spectroscopy measurements is developed. This has the advantage of being non-invasive, which allows for measurements using the emitted light from the plasma. This collisional-radiative code is shown to compare well with the Yacora on the Web model

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Calvagna, Chiara, Andrea Azelio Mencaglia, Iacopo Osticioli, Daniele Ciofini, and Salvatore Siano. "Novel Probe for Thermally Controlled Raman Spectroscopy Using Online IR Sensing and Emissivity Measurements." Sensors 22, no. 7 (2022): 2680. http://dx.doi.org/10.3390/s22072680.

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Temperature rise during Raman spectroscopy can induce chemical alterations of the material under analysis and seriously affect its characterization. Thus, such photothermal side effects can represent a serious problem to be carefully controlled in order to safeguard the integrity of the material and its spectral features. In this work, an innovative probe for thermally controlled portable Raman spectroscopy (exc. 785 nm) equipped with infrared sensing lines was developed. It included an infrared source and two thermopile sensors, which allowed to perform real-time measurements of the local emi

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Johnston, Christopher O., Brian R. Hollis, and Kenneth Sutton. "Radiative Heating Methodology for the Huygens Probe." Journal of Spacecraft and Rockets 44, no. 5 (2007): 993–1002. http://dx.doi.org/10.2514/1.26424.

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Alexanian, Arik G., Nikolay S. Aramyan, Romen P. Grigoryan, Ashot M. Khachatrian, Lenrik A. Matevossian, and Arsham S. Yeremyan. "On the Optical Memory of a Thin-Film pInSb-nCdTe Heterojunction Obtained by Laser Pulsed Deposition." MRS Proceedings 692 (2001): H9.38.1—H9.38.6. http://dx.doi.org/10.1557/proc-692-h9.38.1.

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AbstractThin film pInSb-nCdTe heterojunctions (HJs) were produced using pulsed laser deposition (PLD) technique and their photoelectric properties were studied for various thickness of the CdTe layer at nitrogen temperature and under a background radiation the photo-EMF for which was around 1.5 mV. At radiative excitation of the HJ a photo-EMF is observed, which persists when the excitation is turned off. The optical memory (OM) effect is observed in an idling regime and in a wide spectral range: (0.37–1.37)μm with “recording” (0.37–0.575)μm, (0.75–1.37)μm, and “clearing” (0.575–0.75)μm sub-re

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Cao, Shunshun, Jinchen Jiang, Jaroslaw Dyks, et al. "PSR B0943+10: Mode Switch, Polar Cap Geometry, and Orthogonally Polarized Radiation." Astrophysical Journal 973, no. 1 (2024): 56. http://dx.doi.org/10.3847/1538-4357/ad60c5.

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Abstract As one of the paradigm examples to probe into pulsar magnetospheric dynamics, PSR B0943+10 (J0946+0951) manifests representatively, showing a mode switch, orthogonal polarization, and subpulse drifting, frequently studied below 600 MHz. Here, both integrated and single pulses are studied at a high frequency (1.25 GHz) with FAST. The mode switch is studied using a profile decomposition method. A phase space evolution for the pulsar’s mode switch shows a strange-attractor-like pattern. The radiative geometry is proposed by fitting polarization position angles with the rotating vector mo

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Poklonski, N. A., S. A. Vyrko, A. T. Vlassov, A. I. Siahlo, and S. V. Ratkevich. "Model of Electromagnetic Emitter Based on a Stream of Single Electrons inside Curved Carbon Nanotube." Devices and Methods of Measurements 9, no. 4 (2018): 288–95. http://dx.doi.org/10.21122/2220-9506-2018-9-4-288-295.

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The problems of elaboration and application of microand nanometer sized antennas for the generation and reception of electromagnetic radiation is still relevant in both fundamental and applied aspects. With decreasing antenna size, the frequency of electromagnetic radiation increases, and its power decreases. To increase the radiation power, the periodic (in space) electrodynamic structures are used. The aim of the work is to find the possibility of application of injection and (quasi)ballistic drift of single electrons inside curved carbon nanotubes for emission of electromagnetic waves in th

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Zhang, Lulu, Luis C. Ho, and Aigen Li. "Evidence That Shocks Destroy Small PAH Molecules in Low-luminosity Active Galactic Nuclei." Astrophysical Journal 939, no. 1 (2022): 22. http://dx.doi.org/10.3847/1538-4357/ac930f.

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Abstract We combined mapping-mode mid-infrared Spitzer spectra with complementary infrared imaging to perform a spatially resolved study of polycyclic aromatic hydrocarbon (PAH) emission from the central regions of 66 nearby galaxies, roughly evenly divided into star-forming systems and low-luminosity active galactic nuclei (AGNs). In conjunction with similar measurements available for quasars, we aim to understand the physical properties of PAHs across a broad range of black hole accretion power, with the goal of identifying observational diagnostics that can be used to probe the effect of AG

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Di Menza, Laurent, Claire Michaut, and Océane Saincir. "Diffusion approximation in a radiative transfer model for astrophysical flows." ESAIM: Proceedings and Surveys 64 (2018): 78–92. http://dx.doi.org/10.1051/proc/201864078.

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In this work, we present the diffusion approximation model for radiative transfer when we deal with optically thick astrophysical flows. Since the initial model is high CPU time demanding when dealing with its numerical approximation, solving this simpler system can provide a low cost strategy for the simulation of radiative media. We then use a finite-volume algorithm coupled with an implicit scheme for radiative contributions to solve this simplified system. Numerical experiments in the one-dimensional and two dimensional cases are presented to validate our numerical strategy and to prove th

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Matsumoto, Kosei, Takao Nakagawa, Keiichi Wada, et al. "Probing Dynamics and Thermal Properties Inside Molecular Tori with CO Rovibrational Absorption Lines." Astrophysical Journal 934, no. 1 (2022): 25. http://dx.doi.org/10.3847/1538-4357/ac755f.

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Abstract A recent hydrodynamic model, the radiation-driven fountain model (Wada et al. 2016), presented a dynamical picture that active galactic nuclei (AGNs) tori sustain their geometrical thickness by gas circulation around AGNs, and previous papers have confirmed that this picture is consistent with multiwavelength observations of nearby Seyfert galaxies. Recent near-infrared observations implied that CO rovibrational absorption lines (ΔJ = ± 1, v = 0 − 1, λ ∼ 4.7 μm) could probe the physical properties of the inside tori. However, the origin of the CO absorption lines has been under debate

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Harrop, Bryce E., Jian Lu, L. Ruby Leung, et al. "An overview of cloud–radiation denial experiments for the Energy Exascale Earth System Model version 1." Geoscientific Model Development 17, no. 8 (2024): 3111–35. http://dx.doi.org/10.5194/gmd-17-3111-2024.

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Abstract. The interaction between clouds and radiation is a key process within the climate system, and assessing the impacts of that interaction provides valuable insights into both the present-day climate and future projections. Many modeling experiments have been designed over the years to probe the impact of the cloud radiative effect (CRE) on the climate, including those that seek to disrupt the mean CRE effect and those that only disrupt the covariance of the CRE with the circulation. Seven such experimental designs have been added to the Energy Exascale Earth System Model version 1 (E3SM

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Liu, Jin-Ku, Xi-Lai Zhao, Chen-Xin Zhang, and Zan-Yang Wang. "A Novel Low Axis Ratio Double-Circularly Polarized Microstrip Antenna." International Journal of Antennas and Propagation 2022 (April 13, 2022): 1–7. http://dx.doi.org/10.1155/2022/8947697.

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This article presents a dual circular polarization (CP) microstrip antenna, emitting electromagnetic waves above and below the substrate, which is fed by the double L-probe. Selecting the L-probe feed increases the bandwidth of the antenna, and different probes control the rotation of CP. The antenna could radiate two polarized waves of the same amplitude and vertical through two square radiation patches; meanwhile, adjusting the phase difference between both waves to 90° will produce a CP wave in the far-field. The simulation and measurement results show that the antenna is in 4.3–4.8 GHz ban

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Lévis, K., A. Ittipiboon, and A. Petosa. "Probe radiation cancellation in wideband probe-fed microstrip arrays." Electronics Letters 36, no. 7 (2000): 606. http://dx.doi.org/10.1049/el:20000513.

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Kuli, Muhim, and Kumaresh Sarmah. "Bandwidth Enhancement of Cylindrical Dielectric Resonator Antenna (CDRA) for 5G wireless applications." Journal of Physics: Conference Series 2957, no. 1 (2025): 012016. https://doi.org/10.1088/1742-6596/2957/1/012016.

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Abstract The dielectric resonator antenna (DRA) has taken the role of conventional radiating antennas with its superiority in radiation gain and efficiency such as microstrip and dipole antenna. These are particularly useful for high-frequency applications. This work has proposed and briefly examined a cylindrical dielectric resonator antenna (CDRA) excited by 50 Ω coaxial probe feed at different positions. The designed structures can enhance the bandwidth by introducing an air gap and repositioning the coaxial probe feed. The material used as a dielectric resonator (DR) is Taconic CER which h

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Marin, F. "Modeling optical and UV polarization of AGNs." Astronomy & Astrophysics 615 (July 2018): A171. http://dx.doi.org/10.1051/0004-6361/201833225.

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Context. One of the main challenges for polarimetric observations of active galactic nuclei (AGN) is to properly estimate the amount of parasitic light that contaminates the polarization signal. Removing this unpolarized flux is a complex task that has only been achieved in a couple of objects. Aims. In this fifth paper of the series, we present a new version of the Monte Carlo code STOKES that accounts for dilution by interstellar polarization and host starlight in radiative transfer modeling. Methods. We upgraded our code by including spectral energy distribution (SED) templates for a set of

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Chiaramonti, Ann N., Luis Miaja-Avila, Paul T. Blanchard, David R. Diercks, Brian P. Gorman, and Norman A. Sanford. "A Three-Dimensional Atom Probe Microscope Incorporating a Wavelength-Tuneable Femtosecond-Pulsed Coherent Extreme Ultraviolet Light Source." MRS Advances 4, no. 44-45 (2019): 2367–75. http://dx.doi.org/10.1557/adv.2019.296.

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ABSTRACTPulsed coherent extreme ultraviolet (EUV) radiation is a potential alternative to pulsed near-ultraviolet (NUV) wavelengths for atom probe tomography. EUV radiation has the benefit of high absorption within the first few nm of the sample surface for elements across the entire periodic table. In addition, EUV radiation may also offer athermal field ion emission pathways through direct photoionization or core-hole Auger decay processes, which are not possible with the (much lower) photon energies used in conventional NUV laser-pulsed atom probe. We report preliminary results from what we

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Pashazadeh, Ali, and Christoph Hoeschen. "Simulation study of the effect of the geometrical parameters on the performance of a beta probe." Current Directions in Biomedical Engineering 9, no. 1 (2023): 299–302. http://dx.doi.org/10.1515/cdbme-2023-1075.

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Abstract An intraoperative probe is a small tool used to identify, locate, and dissect pathological lesions during surgery and confirm their removal. The most common type of probe is the gamma probe, which detects gamma-emitting sources. Despite the successful use of gamma probes in clinics, their application can be limited when the background radiation from healthy tissue nearby or the injection site is high. In these cases, the use of beta probes that detect beta-emitting radiotracers would be beneficial. The shorter range of beta radiation compared to gamma radiation would result in improve

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Salmi, Tuomo, Valery F. Suleimanov, Joonas Nättilä, and Juri Poutanen. "Magnetospheric return-current-heated atmospheres of rotation-powered millisecond pulsars." Astronomy & Astrophysics 641 (September 2020): A15. http://dx.doi.org/10.1051/0004-6361/202037824.

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We computed accurate atmosphere models of rotation-powered millisecond pulsars in which the polar caps of a neutron star (NS) are externally heated by magnetospheric return currents. The external ram pressure, energy losses, and stopping depth of the penetrating charged particles were computed self-consistently with the atmosphere model, instead of assuming a simplified deep-heated atmosphere in radiative equilibrium. We used exact Compton scattering formalism to model the properties of the emergent X-ray radiation. The deep-heating approximation was found to be valid only if most of the heat

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Сапрыкин, Э. Г. "Инверсия вклада изотопа малой относительной концентрации в суммарный коэффициент поглощения смеси изотопов неона на переходе 3s-=SUB=-2-=/SUB=--2p-=SUB=-4-=/SUB=-". Журнал технической физики 127, № 8 (2019): 179. http://dx.doi.org/10.21883/os.2019.08.48027.122-18.

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AbstractAbsorption of probe laser radiation by a mixture of even isotopes of neon in a gas discharge plasma is investigated by the method of magnetic scanning of 3 s _2–2 p _4 transition. The contours of absorption lines of isotopes are resolved by means of numerical modeling. It is discovered that, upon decrease in relative concentration of one of the isotopes, its contribution to absorption is replaced by gain. The effect is found to be caused by radiative transfer of excitation energy between atoms of different kinds in the absence of a difference in level energies (the process known as opt

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GIEBELS, BERRIE. "VERY HIGH ENERGY GAMMA-RAY MEASUREMENTS OF BLAZARS." International Journal of Modern Physics D 17, no. 09 (2008): 1431–41. http://dx.doi.org/10.1142/s0218271808013005.

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The origin of γ-rays emitted by blazars is widely attributed to radiative cooling of the most energetic particles in a relativistic flow, which itself is thought to originate from the surroundings of a supermassive black hole. The linkage between the accreting gas, the black hole, jet formation, and the observed radiation from the jet, are still very difficult to establish. The most energetic γ-rays are likely to be produced close to the comptonizing particles acceleration zone, and are therefore a unique probe of the underlying physical mechanisms at play. This report contains a review of the

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Yoshiura, Shintaro, Jack L. B. Line, Kenji Kubota, Kenji Hasegawa, and Keitaro Takahashi. "Foreground mitigation strategy for measuring the 21 cm-LAE cross-correlation." Proceedings of the International Astronomical Union 12, S333 (2017): 292–95. http://dx.doi.org/10.1017/s1743921317011152.

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AbstractThe cross power spectrum of the 21 cm signal and Lyman-α emitters (LAEs) is a probe of the Epoch of Reionization. Astrophysical foregrounds do not correlate with the LAE distribution, though the foregrounds contribute to the error. To study the impact of foregrounds on the measurement, we assume realistic observation by the Murchison Widefield Array using a catalogue of radio galaxies, a LAE survey by the Subaru Hyper Supreme-Cam and the redshift of LAEs is determined by the Prime Focus Spectrograph. The HI distribution is estimated from a radiative transfer simulation with models base

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Habibi, Zakaria. "Homogenization of a Conductive-Radiative Heat Transfer Problem." ESAIM: Proceedings 35 (March 2012): 228–33. http://dx.doi.org/10.1051/proc/201235019.

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Saajasto, Mika, Mika Juvela, Charlène Lefèvre, Laurent Pagani, and Nathalie Ysard. "Multi-wavelength observations and modelling of a quiescent cloud LDN1512." Astronomy & Astrophysics 647 (March 2021): A109. http://dx.doi.org/10.1051/0004-6361/202038401.

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Context. Light scattering at near-infrared (NIR) wavelengths has been used to study the optical properties of the interstellar dust grains, but these studies are limited by the assumptions on the strength of the radiation field. On the other hand, thermal dust emission can be used to constrain the properties of the radiation field, although this is hampered by uncertainty about the dust emissivity. Aims. Combining light scattering and emission studies allows us to probe the properties of the dust grains in detail. We wish to study if current dust models allow us to model a molecular cloud simu

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Evdokimov, Kirill E., Maxim Konischev, Vladimir Pichugin, and Zhiley Sun. "Study of argon ions density and electron temperature and density in magnetron plasma by optical emission spectroscopy and collisional-radiative model." Resource-Efficient Technologies, no. 2 (June 4, 2017): 187–93. http://dx.doi.org/10.18799/24056529/2017/2/123.

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Optical emission spectroscopy (OES) combined with the models of plasma light emission becomes non- intrusive and versatile method of plasma parameters determination. In this paper we have studied the densities of charge carriers and electron temperature in Ar plasma of pulsed DC magnetron in different experimental conditions. Electron density and temperature were determined by fitting of relative emis- sion line intensities calculated from collisional-radiative model (CRM) to experimental ones. The model describes the kinetics of the first 40 excited states of neutral argon Ar and takes into a

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Joulain, K., J. P. Mulet, R. Carminati, and J. J. Greffet. "Nanoscale radiative heating of a sample with a probe." Journal of Magnetism and Magnetic Materials 249, no. 3 (2002): 462–65. http://dx.doi.org/10.1016/s0304-8853(02)00472-9.

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Al-Helal, Ibrahim, Abdullah Alsadon, Mohamed Shady, Abdullah Ibrahim, and Ahmed Abdel-Ghany. "Diffusion Characteristics of Solar Beams Radiation Transmitting through Greenhouse Covers in Arid Climates." Energies 13, no. 2 (2020): 472. http://dx.doi.org/10.3390/en13020472.

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In hot and sunny regions, extensive solar radiation transmitted into greenhouses makes it essential to select a greenhouse cover with specific characteristics. Reflection and diffusion are the most important properties of covers for reducing solar heating load and scattering solar beams for better growth of plants. Three types of plastic films that are commonly used for covering greenhouses in arid climate were selected for this study. These were reflective-diffusive (RDF), diffusive (DF), and locally produced (CF) films. The films were used to cover three identical twin-span greenhouse models

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Gladstone, D. J., X. Q. Lu, J. L. Humm, H. F. Bowman, and L. M. Chin. "A miniature MOSFET radiation dosimeter probe." Medical Physics 21, no. 11 (1994): 1721–28. http://dx.doi.org/10.1118/1.597214.

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Kim, Rinah, Sang Bin Lee, Jae Wook Kim, and Joo Hyun Moon. "Development and Comparison of Fiber-Optic Beta Radiation Sensors with Different Diameters of Their Sensing Probes." Journal of Sensors 2017 (2017): 1–5. http://dx.doi.org/10.1155/2017/1452765.

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A fiber-optic radiation sensor (FORS) was developed for remote and real-time measurements of beta radiation from radioactive-contaminated soil. The sensing probe consisted of a bundle of organic scintillators and a mixture of epoxy resin to improve the detection efficiency. The measurement system consisted of a sensing probe with an aluminium foil reflector, a transmitting plastic optical fiber, and a light-measuring system comprising a photomultiplier tube, a preamplifier, a multichannel analyzer, and a laptop computer. Several sensing probes, whose dead-end diameters were 26 mm (bundle type

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Datta, Rishabh, Aidan Crilly, Jeremy P. Chittenden, et al. "Simulations of radiatively cooled magnetic reconnection driven by pulsed power." Journal of Plasma Physics 90, no. 2 (2024). http://dx.doi.org/10.1017/s0022377824000448.

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Magnetic reconnection is an important process in astrophysical environments, as it reconfigures magnetic field topology and converts magnetic energy into thermal and kinetic energy. In extreme astrophysical systems, such as black hole coronae and pulsar magnetospheres, radiative cooling modifies the energy partition by radiating away internal energy, which can lead to the radiative collapse of the reconnection layer. In this paper, we perform two- and three-dimensional simulations to model the MARZ (Magnetic Reconnection on Z) experiments, which are designed to access cooling rates in the labo

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Dessart, Luc. "Probing red supergiant atmospheres and winds with early-time, high-cadence, high-resolution type II supernova spectra." Astronomy & Astrophysics, January 16, 2025. https://doi.org/10.1051/0004-6361/202452769.

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High-cadence high-resolution spectroscopic observations of infant Type II supernovae (SNe) represent an exquisite probe of the atmospheres and winds of exploding red-supergiant (RSG) stars. Using radiation hydrodynamics and radiative transfer calculations, we studied the gas and radiation properties during and after the phase of shock breakout, considering RSG star progenitors enshrouded within a circumstellar material (CSM) that varies in terms of the extent, density, and velocity profile. In all cases, the original, unadulterated CSM structure is probed only at the onset of shock breakout, s

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Hoppert, Jeffrey B., Ioannis N. Miaoulis, and Peter Y. Wong. "Numerical Modeling of Radiative Properties of Patterned Wafers with Sub-Micron Features." MRS Proceedings 429 (1996). http://dx.doi.org/10.1557/proc-429-51.

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AbstractDecreasing feature sizes in the microelectronics industry have led to numerous processing problems with thin film semiconductors. Non-uniform temperature distributions, due to microscale radiation effects on the radiative properties of the thin film structures, are responsible for wafer defects. These microscale radiation effects become significant as pattern spacing and film thicknesses reach the same order of magnitude as the wavelengths of the heat-source radiation. A numerical model has been developed in which normal emissivities for patterned wafers are calculated, using an effect

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Cui, Longji, Wonho Jeong, Víctor Fernández-Hurtado, et al. "Study of radiative heat transfer in Ångström- and nanometre-sized gaps." Nature Communications 8, no. 1 (2017). http://dx.doi.org/10.1038/ncomms14479.

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Abstract Radiative heat transfer in Ångström- and nanometre-sized gaps is of great interest because of both its technological importance and open questions regarding the physics of energy transfer in this regime. Here we report studies of radiative heat transfer in few Å to 5 nm gap sizes, performed under ultrahigh vacuum conditions between a Au-coated probe featuring embedded nanoscale thermocouples and a heated planar Au substrate that were both subjected to various surface-cleaning procedures. By drawing on the apparent tunnelling barrier height as a signature of cleanliness, we found that

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Wong, Peter Y., and Ioannis N. Miaoulis. "Thermal-Radiation Absorption Characteristics of Patterned Wafers During Rapid Thermal Processing." MRS Proceedings 342 (1994). http://dx.doi.org/10.1557/proc-342-395.

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ABSTRACTMicroscale radiation effects are responsible for the dependence of absorption and temperature distributions on the geometry of the layering structures and the spectral characteristics of the heat source. The effect of patterned wafers, which may contain several different structures and materials, on the wafer absorption characteristics are investigated for rapid thermal processing. A numerical model to determine the thermal radiative absorptivity of the wafer for different structures and materials is presented for different heating conditions. The resulting transient effects are determ

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42

DeWitt, D. P., F. Y. Sorrell, and J. K. Elliott. "Temperature Measurement Issues in Rapid Thermal Processing." MRS Proceedings 470 (1997). http://dx.doi.org/10.1557/proc-470-3.

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ABSTRACTReliable radiometrie temperature measurement has been a major challenge in making rapid thermal processing (RTP) more widely accepted. In order to meet road map requirements involving temperature uncertainty, uniformity and control, new techniques must be demonstrated and/or existing measurement methods must be substantially improved. Critical aspects of radiometrie methods for temperature measurement are centered about the topics: radiative and optical properties of the wafers including layered systems, surface roughness effects, and reflected irradiation from lamp banks and chamber w

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43

Yunovich, A. E., V. E. Kudryashov, A. N. Turkin, M. Leroux, and S. Dalmasso. "Tunnel radiation in the luminescence spectra of GaN-based heterostructures." MRS Proceedings 743 (2002). http://dx.doi.org/10.1557/proc-743-l11.4.

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ABSTRACTTunnel effects in luminescence spectra and electrical properties of LEDs based on InGaN/GaN-heterostructures made by different technological groups were studied. The tunnel radiation in a spectral region of 1.9 - 2.7 eV predominates at low currents (J<0.2 mA). The position of the tunnel luminescence maximum orħħωmax is approximately equal to the voltage U, orħħωmax = eU. The low energy spectral band is described by the theory of tunnel radiative recombination. Tunnel recombination mechanisms in GaN-based heterostructures are caused by high electric fields in the active InGaN/GaN - M

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Duley, W. W., and G. Kinsman. "Excimer Laser Interaction with Metals." MRS Proceedings 285 (January 1, 1992). http://dx.doi.org/10.1557/proc-285-145.

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ABSTRACTExcimer laser radiation may be used to process metal surfaces in a variety of novel ways. The simplest of these involves the use of UV laser pulses for ablation. Ablation occurs as the result of both vaporization and hydrodynamical effects. Experimental data related to these processes will be discussed. In addition, it will be shown how specific irradiation regimes can yield metal surfaces with unique radiative properties.

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McMonagle, Charles J., Chloe A. Fuller, Emanuel Hupf, Lorraine A. Malaspina, Simon Grabowsky, and Dmitry Chernyshov. "Lattice response to the radiation damage of molecular crystals: radiation-induced versus thermal expansivity." Acta Crystallographica Section B Structural Science, Crystal Engineering and Materials 80, no. 1 (2024). http://dx.doi.org/10.1107/s2052520623010636.

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The interaction of intense synchrotron radiation with molecular crystals frequently modifies the crystal structure by breaking bonds, producing fragments and, hence, inducing disorder. Here, a second-rank tensor of radiation-induced lattice strain is proposed to characterize the structural susceptibility to radiation. Quantitative estimates are derived using a linear response approximation from experimental data collected on three materials Hg(NO3)2(PPh3)2, Hg(CN)2(PPh3)2 and BiPh3 [PPh3 = triphenylphosphine, P(C6H5)3; Ph = phenyl, C6H5], and are compared with the corresponding thermal expansi

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Bhattacharyya, Arpan, Saptaswa Ghosh, and Sounak Pal. "Worldline effective field theory of inspiralling black hole binaries in presence of dark photon and axionic dark matter." Journal of High Energy Physics 2023, no. 8 (2023). http://dx.doi.org/10.1007/jhep08(2023)207.

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Abstract We investigate the correction to the potential that gives rise to the bound orbits and radiation from non-spinning inspiralling binary black holes in a dark matter environment consisting of axion-like particles and dark photons using the techniques of Worldline Effective Field Theory. We compute the conservative dynamics up to 1PN order for gravitational, electromagnetic, and Proca fields and up to 2PN order for the scalar field. The effect of axion-electromagnetic coupling (gaγγ) arises to the conservative dynamics at 2.5PN order and the kinetic mixing constant (γ) at 1PN order. Furt

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Kim, Yong Sung, and Shawn-Yu Lin. "Wavelength Selective Emitting Materials Using High-Temperature Photonic Structures." MRS Proceedings 1162 (2009). http://dx.doi.org/10.1557/proc-1162-j02-03.

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AbstractRecently, wavelength selective emitting materials have attracted extensive interest due to their potential of high optical-to-electricity conversion efficiency for thermal photovoltaic (TPV) cells and realizing high efficient incandescent light sources. A substantial increase in spectral control over thermal radiation and photon recycling can accomplish this objective by the development of high-temperature photonic structures (HTPS) that simultaneously suppress unwanted radiation and enhance emission in a desirable wavelength range. In this paper, we shall review the properties of HTPS

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Im, J. S., C. K. Chen, C. V. Thompson, M. W. Geis, and H. Tomita. "Liquid-Solid Interface Morphologies and Defect Structures in Zone-Melting-Recrystallized Silicon-On-Insulator Films." MRS Proceedings 107 (1987). http://dx.doi.org/10.1557/proc-107-169.

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AbstractIn-situ optical microscopy has been used to observe liquid-solid interface morphologies during zone-melting recrystallization of silicon-on-insulator films. These morphologies have been correlated with the defect morphologies of the recrystallized films. Stable cellular solidification fronts, which are obtained at low zone velocities if the radiation intensity gradient in the interfacial region is small, yield subboundary free films. We suggest that under these experimental conditions the interface morphology is primarily the result of radiative heating rather than constitutional super

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Chan, Jennifer Y. H., Qin Han, Kinwah Wu, and Jason D. McEwen. "A covariant formulation for cosmological radiative transfer of the 21-cm line." Monthly Notices of the Royal Astronomical Society, April 23, 2024. http://dx.doi.org/10.1093/mnras/stae1101.

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Abstract The 21-cm hyperfine line of neutral hydrogen is a useful tool to probe the conditions of the Universe during the Dark Ages, Cosmic Dawn, and the Epoch of Reionisation. In most of the current calculations, the 21-cm line signals at given frequencies are computed, using an integrated line-of-sight line opacity, with the correction for cosmological expansion. These calculations have not fully captured the line and continuum interactions in the radiative transfer, in response to evolution of the radiation field and the variations of thermal and dynamic properties of the line-of-sight medi

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50

Crawford, M. H., J. Han, M. A. Banas, S. M. Myers, G. A. Petersen, and J. J. Figiel. "Optical Spectroscopy of Ingan Epilayers in the Low Indium Composition Regime." MRS Proceedings 595 (1999). http://dx.doi.org/10.1557/proc-595-f99w11.41.

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AbstractPhotoluminescence (PL) spectroscopy was carried out on a series of Si-doped bulk InGaN films in the low indium (In) composition regime. Room temperature PL showed a factor of 25 increase in integrated intensity as the In composition was increased from 0 to 0.07. Temperature dependent PL data was fit to an Arrhenius equation to reveal an increasing activation energy for thermal quenching of the PL intensity as the In composition is increased. Time resolved PL measurements revealed that only the sample with highest In ( x=0.07) showed a strong spectral variation in decay time across the

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