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https://www.readbyqxmd.com/read/29347709/interaction-of-a-planar-reacting-shock-wave-with-an-isotropic-turbulent-vorticity-field
#1
César Huete, Tai Jin, Daniel Martínez-Ruiz, Kun Luo
Linear interaction analysis (LIA) is employed to investigate the interaction of reactive and nonreactive shock waves with isotropic vortical turbulence. The analysis is carried out, through Laplace-transform technique, accounting for long-time effects of vortical disturbances on the burnt-gas flow in the fast-reaction limit, where the reaction-region thickness is significantly small in comparison with the most representative turbulent length scales. Results provided by the opposite slow-reaction limit are also recollected...
November 2017: Physical Review. E
https://www.readbyqxmd.com/read/29347553/instabilities-of-convection-patterns-in-a-shear-thinning-fluid-between-plates-of-finite-conductivity
#2
Thomas Varé, Chérif Nouar, Christel Métivier
Rayleigh-Bénard convection in a horizontal layer of a non-Newtonian fluid between slabs of arbitrary thickness and finite thermal conductivity is considered. The first part of the paper deals with the primary bifurcation and the relative stability of convective patterns at threshold. Weakly nonlinear analysis combined with Stuart-Landau equation is used. The competition between squares and rolls, as a function of the shear-thinning degree of the fluid, the slabs' thickness, and the ratio of the thermal conductivity of the slabs to that of the fluid is investigated...
October 2017: Physical Review. E
https://www.readbyqxmd.com/read/29347491/broadening-of-cyclotron-resonance-conditions-in-the-relativistic-interaction-of-an-intense-laser-with-overdense-plasmas
#3
Takayoshi Sano, Yuki Tanaka, Natsumi Iwata, Masayasu Hata, Kunioki Mima, Masakatsu Murakami, Yasuhiko Sentoku
The interaction of dense plasmas with an intense laser under a strong external magnetic field has been investigated. When the cyclotron frequency for the ambient magnetic field is higher than the laser frequency, the laser's electromagnetic field is converted to the whistler mode that propagates along the field line. Because of the nature of the whistler wave, the laser light penetrates into dense plasmas with no cutoff density, and produces superthermal electrons through cyclotron resonance. It is found that the cyclotron resonance absorption occurs effectively under the broadened conditions, or a wider range of the external field, which is caused by the presence of relativistic electrons accelerated by the laser field...
October 2017: Physical Review. E
https://www.readbyqxmd.com/read/29347323/evolution-of-inverse-cascades-and-formation-of-precondensate-in-gross-pitaevskii-turbulence-in-two-dimensions
#4
Natalia Vladimirova
Here we study how coherence appears in a system driven by noise at small scales. In the wave turbulence modeled by the Gross-Pitaevskii or the nonlinear Schrödinger equation, we observe states with correlation scales smaller than the system size but much larger than the excitation scale. We call a such state precondensate to distinguish it from condensate defined as a systemwide coherent state. Both condensate and precondensate are characterized by large-scale phase coherence and a narrow distribution of amplitudes...
December 2017: Physical Review. E
https://www.readbyqxmd.com/read/29347319/electromagnetic-radiation-absorption-by-water
#5
P Lunkenheimer, S Emmert, R Gulich, M Köhler, M Wolf, M Schwab, A Loidl
Why does a microwave oven work? How does biological tissue absorb electromagnetic radiation? Astonishingly, we do not have a definite answer to these simple questions because the microscopic processes governing the absorption of electromagnetic waves by water are largely unclarified. This absorption can be quantified by dielectric loss spectra, which reveal a huge peak at a frequency of the exciting electric field of about 20 GHz and a gradual tailing off toward higher frequencies. The microscopic interpretation of such spectra is highly controversial and various superpositions of relaxation and resonance processes ascribed to single-molecule or molecule-cluster motions have been proposed for their analysis...
December 2017: Physical Review. E
https://www.readbyqxmd.com/read/29347127/long-time-instability-in-the-runge-kutta-algorithm-for-a-nos%C3%A3-hoover-heat-bath-of-a-harmonic-chain-and-its-stabilization
#6
Baiyili Liu, Shaoqiang Tang
In this paper, we investigate the Runge-Kutta algorithm for the Nosé-Hoover heat bath of a harmonic chain. The Runge-Kutta algorithm is found to be unstable in long-time calculations, with the system temperature growing exponentially. The growth rate increases if time step size is chosen larger. By analyzing the Fourier spectra in both space (wave number) and time (frequency), we discover that the growth is caused by spurious energy accumulation, particularly at the largest wave number. Such accumulation may be explained by von Neumann analysis for an infinite chain, with the nonlinear heat bath being ignored...
July 2017: Physical Review. E
https://www.readbyqxmd.com/read/29346852/symptomatic-response-of-the-elderly-with-cardiovascular-disease-during-the-heat-wave-in-slovenia
#7
Rok Fink, Ivan Eržen, Sašo Medved
No abstract text is available yet for this article.
December 2017: Central European Journal of Public Health
https://www.readbyqxmd.com/read/29335771/risk-perception-of-heat-waves-and-its-spatial-variation-in-nanjing-china
#8
Lei Huang, Qianqi Yang, Jie Li, Jin Chen, Ruoying He, Can Zhang, Kai Chen, Steven Guanpeng Dong, Yang Liu
The intensity, frequency, and duration of heat waves are expected to increase with climate change. In this study, we found a significant difference of public perceived effects of heat waves and trust in government among urban, suburban, and rural districts. Rural residents had a significant higher effect perception than urbanites and also showed stronger willingness to have medical insurance or regular physical examinations. Meanwhile, suburban residents had the lowest trust perception in government among these three districts, which may be due to suburban districts' unique social structure and complex social issues...
December 13, 2017: International Journal of Biometeorology
https://www.readbyqxmd.com/read/29335677/two-dimensional-imaging-and-modification-of-nanophotonic-resonator-modes-using-a-focused-ion-beam
#9
William R McGehee, Thomas Michels, Vladimir Aksyuk, Jabez J McClelland
High-resolution imaging of optical resonator modes is a key step in the development and characterization of nanophotonic devices. Many sub-wavelength mode-imaging techniques have been developed using optical and electron beam excitation-each with its own limitations in spectral and spatial resolution. Here, we report a 2D imaging technique using a pulsed, low-energy focused ion beam of Li+ to probe the near-surface fields inside photonic resonators. The ion beam locally modifies the resonator structure, causing temporally varying spectroscopic shifts of the resonator...
November 2017: Optica
https://www.readbyqxmd.com/read/29331284/effects-of-an-experimental-heat-wave-on-fatty-acid-composition-in-two-mediterranean-seagrass-species
#10
Pedro Beca-Carretero, Freddy Guihéneuf, Lázaro Marín-Guirao, Jaime Bernardeau-Esteller, Rocío García-Muñoz, Dagmar B Stengel, Juan M Ruiz
Global warming is emerging as one of the most critical threats to terrestrial and marine species worldwide. This study assessed the effects of simulated warming events in culture on two seagrass species, Posidonia oceanica and Cymodocea nodosa, which play a key role in coastal ecosystems of the Mediterranean Sea. Changes in fatty acids as key metabolic indicators were assessed in specimens from two geographical populations of each species adapted to different in situ temperature regimes. Total fatty acid (TFA) content and composition were compared in C...
January 10, 2018: Marine Pollution Bulletin
https://www.readbyqxmd.com/read/29330440/evidence-of-s-wave-superconductivity-in-the-noncentrosymmetric-la7ir3
#11
B Li, C Q Xu, W Zhou, W H Jiao, R Sankar, F M Zhang, H H Hou, X F Jiang, B Qian, B Chen, A F Bangura, Xiaofeng Xu
Superconductivity in noncentrosymmetric compounds has attracted sustained interest in the last decades. Here we present a detailed study on the transport, thermodynamic properties and the band structure of the noncentrosymmetric superconductor La 7 Ir 3 (T c  ~ 2.3 K) that was recently proposed to break the time-reversal symmetry. It is found that La7Ir3 displays a moderately large electronic heat capacity (Sommerfeld coefficient γ n  ~ 53.1 mJ/mol K2) and a significantly enhanced Kadowaki-Woods ratio (KWR ~32 μΩ cm mol2 K2 J-2) that is greater than the typical value (~10 μΩ cm mol2 K2 J-2) for strongly correlated electron systems...
January 12, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29328707/second-sound-in-systems-of-one-dimensional-fermions
#12
K A Matveev, A V Andreev
We study sound in Galilean invariant systems of one-dimensional fermions. At low temperatures, we find a broad range of frequencies in which in addition to the waves of density there is a second sound corresponding to the ballistic propagation of heat in the system. The damping of the second sound mode is weak, provided the frequency is large compared to a relaxation rate that is exponentially small at low temperatures. At lower frequencies, the second sound mode is damped, and the propagation of heat is diffusive...
December 29, 2017: Physical Review Letters
https://www.readbyqxmd.com/read/29324721/electromagnetic-acoustic-transducers-for-robotic-nondestructive-inspection-in-harsh-environments
#13
Sungho Choi, Hwanjeong Cho, Matthew S Lindsey, Cliff J Lissenden
Elevated temperature, gamma radiation, and geometric constraints inside dry storage casks for spent nuclear fuel represent a harsh environment for nondestructive inspection of the cask and require that the inspection be conducted with a robotic system. Electromagnetic acoustic transducers (EMATs) using non-contact ultrasonic transduction based on the Lorentz force to excite/receive ultrasonic waves are suited for use in the robotic inspection. Periodic permanent magnet EMATs that actuate/receive shear horizontal guided waves are developed for application to robotic nondestructive inspection of stress corrosion cracks in the heat affected zone of welds in stainless steel dry storage canisters...
January 11, 2018: Sensors
https://www.readbyqxmd.com/read/29322590/cocoa-agroforestry-is-less-resilient-to-sub-optimal-and-extreme-climate-than-cocoa-in-full-sun-reply-to-norgrove-2017
#14
Issaka Abdulai, Philippe Vaast, Munir P Hoffmann, Richard Asare, Laurence Jassogne, Piet Van Asten, Reimund P Rötter, Sophie Graefe
The critique of Norgrove, (2017) addresses two main points, which are discussed below (i) Resilience of cocoa agroforestry versus full sun under extreme climatic conditions In our study we covered extreme climatic events, a heat-wave combined with a severe dry season lasting longer than usual and killing cocoa trees under shade. These climatic conditions were not only observed at our study plots, but also in the larger cocoa cultivation region (Fig 1). In line with our observations, "certain cocoa cooperatives in Ivory Coast reported that shade trees in their cocoa fields accentuated the drought stress during the 2015 drought event" (1 Andrew Broosk, pers comm)...
January 11, 2018: Global Change Biology
https://www.readbyqxmd.com/read/29315858/understanding-successful-and-unsuccessful-landings-of-aerial-manoeuvre-variations-in-professional-surfing
#15
James R Forsyth, Diane L Riddiford-Harland, John W Whitting, Jeremy M Sheppard, Julie R Steele
Although performing aerial manoeuvres can increase wave score and winning potential in competitive surfing, the critical features underlying successful aerial performance have not been systematically investigated. This study aimed to analyse highly skilled aerial manoeuvre performance and identify the critical features associated with successful or unsuccessful landing. Using video recordings of the World Surf League's Championship Tour, every aerial performed during the quarterfinal, semi-final and final heats from the 11 events in the 2015 season were viewed...
January 9, 2018: Scandinavian Journal of Medicine & Science in Sports
https://www.readbyqxmd.com/read/29314047/plasticity-of-photosynthetic-heat-tolerance-in-plants-adapted-to-thermally-contrasting-biomes
#16
Lingling Zhu, Keith J Bloomfield, Charles H Hocart, John J G Egerton, Odhran S O'Sullivan, Aurore Penillard, Lasantha K Weerasinghe, Owen K Atkin
In many biomes, plants are subject to heat-waves, potentially causing irreversible damage to the photosynthetic apparatus. Field surveys have documented global, temperature-dependent patterns in photosynthetic heat tolerance (PHT ); however, it remains unclear if these patterns reflect acclimation in PHT or inherent differences among species adapted to contrasting habitats. To address these unknowns, we quantified seasonal variations in Tcrit (high temperature where minimal chlorophyll-a fluorescence rises rapidly, reflecting disruption to photosystem II) in 62 species native to six sites from five thermally-contrasting biomes across Australia...
January 5, 2018: Plant, Cell & Environment
https://www.readbyqxmd.com/read/29313668/high-thermoelectric-performance-of-in4se3-based-materials-and-the-influencing-factors
#17
Xin Yin, Jing-Yuan Liu, Ling Chen, Li-Ming Wu
Materials that can directly convert electricity into heat, i.e., thermoelectric materials, have attracted renewed attention globally for sustainable energy applications. As one of the state-of-the-art thermoelectric materials, In4Se3 features an interesting crystal structure of quasi-two-dimensional sheets comprising In/Se chains that provide a platform to achieve a Peierls distortion and support a charge density wave instability. Single-crystal In4Se3-δ (δ = 0.65) shows strong anisotropy in its thermoelectric properties with a very high ZT of 1...
January 9, 2018: Accounts of Chemical Research
https://www.readbyqxmd.com/read/29311550/short-heatwaves-during-fluctuating-incubation-regimes-produce-females-under-temperature-dependent-sex-determination-with-implications-for-sex-ratios-in-nature
#18
A W Carter, B M Sadd, T D Tuberville, R T Paitz, R M Bowden
Patterns of temperature fluctuations in nature affect numerous biological processes, yet, empirical studies often utilize constant temperature treatments. This can limit our understanding of how thermally sensitive species respond to ecologically relevant temperatures. Research on turtles with temperature-dependent sex determination (TSD) provides good examples of this, since nest temperatures from many populations rarely exceed those necessary to produce females under constant laboratory conditions. We hypothesized that exposure to brief periods of warm temperatures (i...
January 8, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29302276/haemoglobin-mediated-response-to-hyper-thermal-stress-in-the-keystone-species-daphnia-magna
#19
Maria Cuenca Cambronero, Bettina Zeis, Luisa Orsini
Anthropogenic global warming has become a major geological and environmental force driving drastic changes in natural ecosystems. Due to the high thermal conductivity of water and the effects of temperature on metabolic processes, freshwater ecosystems are among the most impacted by these changes. The ability to tolerate changes in temperature may determine species long-term survival and fitness. Therefore, it is critical to identify coping mechanisms to thermal and hyper-thermal stress in aquatic organisms...
January 2018: Evolutionary Applications
https://www.readbyqxmd.com/read/29301699/two-dimensional-closed-form-model-for-temperature-in-living-tissues-for-hyperthermia-treatments
#20
Jaideep Dutta, Balaram Kundu
This research article determines an exact analytical expression for 2-D thermal field in single layer living tissues under a therapeutic condition by means of Fourier and non-Fourier heat transfer approaches. An actual spatially dependent initial condition has been adopted to analyze the heat propagation in tissues. The exact analytical determination for this actual initial condition for temperature may be difficult. However, in this study, an approximate analytical method has newly been established for an appropriate initial condition...
January 2018: Journal of Thermal Biology
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