keyword
MENU ▼
Read by QxMD icon Read
search

Heat wave

keyword
https://www.readbyqxmd.com/read/28646774/observations-of-black-carbon-aerosols-characteristics-over-an-urban-environment-radiative-forcing-and-related-implications
#1
Samina Bibi, Khan Alam, Farrukh Chishtie, Humera Bibi, Said Rahman
With observations of black carbon (BC) aerosol concentrations, optical and radiative properties were obtained over the urban city of Karachi during the period of March 2006-December 2008. BC concentrations were continuously measured using an Aethalometer, while optical and radiative properties were estimated through the Optical Properties of Aerosols and Clouds (OPAC) and Santa Barbra DISORT Atmospheric Radiative Transfer (SBDART) models, respectively. For the study period, the measured BC concentrations were higher during January, February and November, while lower during May, June, July and August...
June 21, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28644983/future-heat-waves-due-to-climate-change-threaten-the-survival-of-p-%C3%A2-oceanica-seedlings
#2
Laura Guerrero-Meseguer, Arnaldo Marín, Carlos Sanz-Lázaro
Extreme weather events are major drivers of ecological change, and their occurrence is likely to increase due to climate change. The transient increases in atmospheric temperatures are leading to a greater occurrence of heat waves, extreme events that can produce a substantial warming of water, especially in enclosed basins such as the Mediterranean Sea. Here, we tested the effects of current and predicted heat waves on the early stages of development of the seagrass Posidonia oceanica. Temperatures above 27 °C limited the growth of the plant by inhibiting its photosynthetic system...
June 20, 2017: Environmental Pollution
https://www.readbyqxmd.com/read/28642434/on-the-generation-of-solar-spicules-and-alfv%C3%A3-nic-waves
#3
J Martínez-Sykora, B De Pontieu, V H Hansteen, L Rouppe van der Voort, M Carlsson, T M D Pereira
In the lower solar atmosphere, the chromosphere is permeated by jets known as spicules, in which plasma is propelled at speeds of 50 to 150 kilometers per second into the corona. The origin of the spicules is poorly understood, although they are expected to play a role in heating the million-degree corona and are associated with Alfvénic waves that help drive the solar wind. We compare magnetohydrodynamic simulations of spicules with observations from the Interface Region Imaging Spectrograph and the Swedish 1-m Solar Telescope...
June 23, 2017: Science
https://www.readbyqxmd.com/read/28640460/giant-peak-voltage-of-thermopower-waves-driven-by-the-chemical-potential-gradient-of-single-crystalline-bi2-te3
#4
Swati Singh, Hyeona Mun, Sanghoon Lee, Sung Wng Kim, Seunghyun Baik
The self-propagating exothermic chemical reaction with transient thermovoltage, known as the thermopower wave, has received considerable attention recently. A greater peak voltage and specific power are still demanded, and materials with greater Seebeck coefficients have been previously investigated. However, this study employs an alternative mechanism of transient chemical potential gradient providing an unprecedentedly high peak voltage (maximum: 8 V; average: 2.3 V) and volume-specific power (maximum: 0...
June 22, 2017: Advanced Materials
https://www.readbyqxmd.com/read/28636351/heats-of-formation-of-medium-size-organic-compounds-from-contemporary-electronic-structure-methods
#5
Yury Minenkov, Heng Wang, Zhandong Wang, S Mani Sarathy, Luigi Cavallo
Computational electronic structure calculations are routinely undertaken to predict thermodynamic properties of the various species. However, the application of highly accurate wave function theory methods, such as the "gold standard" coupled cluster approach including single, double and partly triple excitations in perturbative fashion, CCSD(T), to large molecules is limited due to high computational cost. In this work, the promising domain based local pair natural orbital coupled cluster approach, DLPNO-CCSD(T), has been tested to reproduce 113 accurate formation enthalpies of medium-size molecules (few dozens heavy atoms) important for bio- and combustion chemistry via the reaction based Feller-Peterson-Dixon approach...
June 21, 2017: Journal of Chemical Theory and Computation
https://www.readbyqxmd.com/read/28630921/increasing-probability-of-mortality-during-indian-heat-waves
#6
Omid Mazdiyasni, Amir AghaKouchak, Steven J Davis, Shahrbanou Madadgar, Ali Mehran, Elisa Ragno, Mojtaba Sadegh, Ashmita Sengupta, Subimal Ghosh, C T Dhanya, Mohsen Niknejad
Rising global temperatures are causing increases in the frequency and severity of extreme climatic events, such as floods, droughts, and heat waves. We analyze changes in summer temperatures, the frequency, severity, and duration of heat waves, and heat-related mortality in India between 1960 and 2009 using data from the India Meteorological Department. Mean temperatures across India have risen by more than 0.5°C over this period, with statistically significant increases in heat waves. Using a novel probabilistic model, we further show that the increase in summer mean temperatures in India over this period corresponds to a 146% increase in the probability of heat-related mortality events of more than 100 people...
June 2017: Science Advances
https://www.readbyqxmd.com/read/28630407/colony-adaptive-response-to-simulated-heat-waves-and-consequences-at-the-individual-level-in-honeybees-apis-mellifera
#7
Célia Bordier, Hélène Dechatre, Séverine Suchail, Mathilde Peruzzi, Samuel Soubeyrand, Maryline Pioz, Michel Pélissier, Didier Crauser, Yves Le Conte, Cédric Alaux
Since climate change is expected to bring more severe and frequent extreme weather events such as heat waves, assessing the physiological and behavioural sensitivity of organisms to temperature becomes a priority. We therefore investigated the responses of honeybees, an important insect pollinator, to simulated heat waves (SHW). Honeybees are known to maintain strict brood thermoregulation, but the consequences at the colony and individual levels remain poorly understood. For the first time, we quantified and modelled colony real-time activity and found a 70% increase in foraging activity with SHW, which was likely due to the recruitment of previously inactive bees...
June 19, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28619277/non-invasive-estimation-of-temperature-during-physiotherapeutic-ultrasound-application-using-the-average-gray-level-content-of-b-mode-images-a-metrological-approach
#8
André V Alvarenga, Volker Wilkens, Olga Georg, Rodrigo P B Costa-Félix
Healing therapies that make use of ultrasound are based on raising the temperature in biological tissue. However, it is not possible to heal impaired tissue by applying a high dose of ultrasound. The temperature of the tissue is ultimately the physical quantity that has to be assessed to minimize the risk of undesired injury. Invasive temperature measurement techniques are easy to use, despite the fact that they are detrimental to human well being. Another approach to assessing a rise in tissue temperature is to derive the material's general response to temperature variations from ultrasonic parameters...
June 12, 2017: Ultrasound in Medicine & Biology
https://www.readbyqxmd.com/read/28619023/potential-for-adaptation-to-climate-change-family-level-variation-in-fitness-related-traits-and-their-responses-to-heat-waves-in-a-snail-population
#9
Katja Leicht, Katri Seppälä, Otto Seppälä
BACKGROUND: On-going global climate change poses a serious threat for natural populations unless they are able to evolutionarily adapt to changing environmental conditions (e.g. increasing average temperatures, occurrence of extreme weather events). A prerequisite for evolutionary change is within-population heritable genetic variation in traits subject to selection. In relation to climate change, mainly phenological traits as well as heat and desiccation resistance have been examined for such variation...
June 15, 2017: BMC Evolutionary Biology
https://www.readbyqxmd.com/read/28615483/gecko-youngsters-more-at-risk-after-incubating-during-a-heat-wave
#10
Kathryn Knight
No abstract text is available yet for this article.
June 15, 2017: Journal of Experimental Biology
https://www.readbyqxmd.com/read/28614316/rapid-direct-laser-writing-of-desired-plasmonic-nanostructures
#11
Quang Cong Tong, Mai Hoang Luong, Jacqueline Remmel, Minh Thanh Do, Dam Thuy Trang Nguyen, Ngoc Diep Lai
We demonstrate a direct way to realize arbitrary gold nanostructures via a local dewetting method. This technique was based on the optically induced local thermal effect at the focusing region of a direct laser writing (DLW) system employing a green continuous-wave laser. The local high temperature allowed the creation of gold nano-islands only at the focusing area of the optical system. By moving the focusing spot, this DLW method allowed us to "write" desired two-dimensional gold patterns with a feature size down to sub-lambda...
June 15, 2017: Optics Letters
https://www.readbyqxmd.com/read/28610712/the-effect-of-heating-rate-and-sintering-temperature-on-the-elastic-modulus-of-porcelain-tiles
#12
Elif Eren Gültekin
The scope of the present study is to investigate the change of elastic modulus with the physical and mechanical properties of porcelain tiles. In the study, porcelain tiles were sintered at different temperatures and at different heating rates to obtain minimum water absorption (%). After this, the time of flight of longitudinal and shear ultrasonic waves was measured through the tile. The time of flight of ultrasonic waves was measured using contact ultrasonic transducers operating on a pulse-echo mode. Using the time of flight of the ultrasonic waves and the thickness of the tiles, the velocity of the waves was determined...
June 3, 2017: Ultrasonics
https://www.readbyqxmd.com/read/28604365/avalanche-criticality-in-thermal-driven-martensitic-transitions-the-asymmetry-of-the-forward-and-reverse-transitions-in-shape-memory-materials
#13
Antoni Planes, Eduard Vives
Martensitic transitions take place intermittently as a sequence of avalanches, which are accompanied by the emission of acoustic waves. The study of this acoustic emission (AE) reveals the scale-free nature of the avalanches. In a number of shape memory materials undergoing a martensitic transition it has been found that, in spite of the relatively low hysteresis, the dynamics of forward and reverse transitions are different, which may explain the fact that the AE activity is different in both forward and reverse transitions...
June 12, 2017: Journal of Physics. Condensed Matter: An Institute of Physics Journal
https://www.readbyqxmd.com/read/28600224/enhancement-of-transdermal-protein-delivery-by-photothermal-effect-of-gold-nanorods-coated-on-polysaccharide-based-hydrogel
#14
Aung Thu Haine, Yuki Koga, Yuta Hashimoto, Taishi Higashi, Keiichi Motoyama, Hidetoshi Arima, Takuro Niidome
Transdermal protein delivery is a useful and attractive method for protein therapy and dermal vaccination. However, this delivery method is restricted by the low permeability of the stratum corneum. The purpose of this study was to develop a transdermal delivery system for enhancement of protein permeability into the skin. First, we prepared a transparent gel patch made of polysaccharides with gold nanorods on the gel surface and fluorescein isothiocyanate-modified ovalbumin (FITC-OVA) inside. Next, the gel patch was placed on mouse skin to allow contact with the coated gold nanorods, and irradiated by a continuous-wave laser...
June 6, 2017: European Journal of Pharmaceutics and Biopharmaceutics
https://www.readbyqxmd.com/read/28599264/time-series-analysis-of-heat-waves-and-emergency-department-visits-in-atlanta-1993-to-2012
#15
(no author information available yet)
BACKGROUND: Heat waves are extreme weather events that have been associated with adverse health outcomes. However, there is limited knowledge of heat waves' impact on population morbidity, such as emergency department (ED) visits. OBJECTIVES: We investigated associations between heat waves and ED visits for 17 outcomes in Atlanta over a 20-year period, 1993-2012. METHODS: Associations were estimated using Poisson log-linear models controlling for continuous air temperature, dew-point temperature, day of week, holidays, and time trends...
May 31, 2017: Environmental Health Perspectives
https://www.readbyqxmd.com/read/28598628/bipolar-photothermoelectric-effect-across-energy-filters-in-single-nanowires
#16
Steven Limpert, Adam Burke, I-Ju Chen, Nicklas Anttu, Sebastian Lehmann, Sofia Fahlvik, Stephen Bremner, Gavin Conibeer, Claes Thelander, Mats-Erik Pistol, Heiner Linke
The photothermoelectric (PTE) effect uses nonuniform absorption of light to produce a voltage via the Seebeck effect and is of interest for optical sensing and solar-to-electric energy conversion. However, the utility of PTE devices reported to date has been limited by the need to use a tightly focused laser spot to achieve the required, nonuniform illumination and by their dependence upon the Seebeck coefficients of the constituent materials, which exhibit limited tunability and, generally, low values. Here, we use InAs/InP heterostructure nanowires to overcome these limitations: first, we use naturally occurring absorption "hot spots" at wave mode maxima within the nanowire to achieve sharp boundaries between heated and unheated subwavelength regions of high and low absorption, allowing us to use global illumination; second, we employ carrier energy-filtering heterostructures to achieve a high Seebeck coefficient that is tunable by heterostructure design...
June 16, 2017: Nano Letters
https://www.readbyqxmd.com/read/28597512/vortex-fluidic-chemical-transformations
#17
Joshua Britton, Keith A Stubbs, Gregory A Weiss, Colin L Raston
Driving chemical transformations in dynamic thin films represents a rapidly thriving and diversifying research area. Dynamic thin films provide a number of benefits including large surface areas, high shearing rates, rapid heat and mass transfer, micromixing and fluidic pressure waves. Combinations of these effects provide an avant-garde style of conducting chemical reactions with surprising and unusual outcomes. The vortex fluidic device (VFD) has proved its capabilities in accelerating and increasing the efficiencies of numerous organic, materials and biochemical reactions...
June 8, 2017: Chemistry: a European Journal
https://www.readbyqxmd.com/read/28593746/long-term-measurements-of-chlorophyll-a-fluorescence-using-the-jip-test-show-that-combined-abiotic-stresses-influence-the-photosynthetic-performance-of-the-perennial-ryegrass-lolium-perenne-in-a-managed-temperate-grassland
#18
Anthony Digrado, Aurélie Bachy, Ahsan Mozaffar, Niels Schoon, Filippo Bussotti, Crist Amelynck, Anne-Catherine Dalcq, Marie-Laure Fauconnier, Marc Aubinet, Bernard Heinesch, Patrick du Jardin, Pierre Delaplace
Several experiments have highlighted the complexity of stress interactions involved in plant response. The impact in field conditions of combined environmental constraints on the mechanisms involved in plant photosynthetic response, however, remains understudied. In a long-term field study performed in a managed grassland, we investigated the photosynthetic apparatus response of the perennial ryegrass (Lolium perenne) to environmental constraints and its ability to recover and acclimatize. Frequent field measurements of chlorophyll ɑ fluorescence (ChlF) were made in order to determine the photosynthetic performance response of a population of L...
June 8, 2017: Physiologia Plantarum
https://www.readbyqxmd.com/read/28591871/-relevance-of-heat-health-actions-plans-for-preventive-public-health-in-germany
#19
Birgit Zielo, Andreas Matzarakis
Background Heat waves are among the extreme weather events and represent a growing health hazard for the population in Europe. According to the current climate studies, the probability of an increase and intensification of heat waves has been increasing for years. Particularly affected by exposure to unusually high heat are people whose organism is already weakened by age or illness. As the share of senior citizens in Germany continues to rise as a result of demographic change, the health effects of heat waves are gaining in importance...
June 7, 2017: Das Gesundheitswesen
https://www.readbyqxmd.com/read/28581797/enhancing-near-field-radiative-heat-transfer-with-si-based-metasurfaces
#20
V Fernández-Hurtado, F J García-Vidal, Shanhui Fan, J C Cuevas
We demonstrate in this work that the use of metasurfaces provides a viable strategy to largely tune and enhance near-field radiative heat transfer between extended structures. In particular, using a rigorous coupled wave analysis, we predict that Si-based metasurfaces featuring two-dimensional periodic arrays of holes can exhibit a room-temperature near-field radiative heat conductance much larger than any unstructured material to date. We show that this enhancement, which takes place in a broad range of separations, relies on the possibility to largely tune the properties of the surface plasmon polaritons that dominate the radiative heat transfer in the near-field regime...
May 19, 2017: Physical Review Letters
keyword
keyword
4223
1
2
Fetch more papers »
Fetching more papers... Fetching...
Read by QxMD. Sign in or create an account to discover new knowledge that matter to you.
Remove bar
Read by QxMD icon Read
×

Search Tips

Use Boolean operators: AND/OR

diabetic AND foot
diabetes OR diabetic

Exclude a word using the 'minus' sign

Virchow -triad

Use Parentheses

water AND (cup OR glass)

Add an asterisk (*) at end of a word to include word stems

Neuro* will search for Neurology, Neuroscientist, Neurological, and so on

Use quotes to search for an exact phrase

"primary prevention of cancer"
(heart or cardiac or cardio*) AND arrest -"American Heart Association"