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https://www.readbyqxmd.com/read/29345038/electrocatalytic-activity-of-2d-phosphorene-based-heteroelectrocatalyst-for-photoelectrochemical-cells
#1
Munkhbayar Batmunkh, Aabhash Shrestha, Munkhjargal Bat-Erdene, Md Julker Nine, Cameron James Shearer, Christopher Gibson, Ashley Slattery, Sherif Tawfik, Michael Ford, Sheng Dai, Shizhang Qiao, Joseph George Shapter
Research into efficient synthesis, fundamental properties and potential applications of phosphorene is currently the subject of intense investigation. Herein, solution processed phosphorene or few-layer black phosphorus (FL-BP) sheets are prepared using microwave-exfoliation method and used in photoelectrochemical cells. Based on our experimental and theoretical (DFT) studies, we found that the FL-BP sheets can act as catalytically active sites and show excellent electrocatalytic activity for triiodide reduction in solar cells...
January 17, 2018: Angewandte Chemie
https://www.readbyqxmd.com/read/29344754/green-and-sustainable-separation-of-natural-products-from-agro-industrial-waste-challenges-potentialities-and-perspectives-on-emerging-approaches
#2
REVIEW
Vânia G Zuin, Luize Z Ramin
New generations of biorefinery combine innovative biomass waste resources from different origins, chemical extraction and/or synthesis of biomaterials, biofuels, and bioenergy via green and sustainable processes. From the very beginning, identifying and evaluating all potentially high value-added chemicals that could be removed from available renewable feedstocks requires robust, efficient, selective, reproducible, and benign analytical approaches. With this in mind, green and sustainable separation of natural products from agro-industrial waste is clearly attractive considering both socio-environmental and economic aspects...
January 17, 2018: Topics in Current Chemistry (Journal)
https://www.readbyqxmd.com/read/29344723/structural-associations-between-organelle-membranes-in-nectary-parenchyma-cells
#3
Silvia Rodrigues Machado, Elisa A Gregório, Tatiane M Rodrigues
The close association between membranes and organelles, and the intense chloroplast remodeling in parenchyma cells of extrafloral nectaries occurred only at the secretion time and suggest a relationship with the nectar secretion. Associations between membranes and organelles have been well documented in different tissues and cells of plants, but poorly explored in secretory cells. Here, we described the close physical juxtaposition between membranes and organelles, mainly with chloroplasts, in parenchyma cells of Citharexylum myrianthum (Verbenaeceae) extrafloral nectaries under transmission electron microscopy, using conventional and microwave fixation...
January 17, 2018: Planta
https://www.readbyqxmd.com/read/29344224/long-term-outcomes-of-microwave-endometrial-ablation-for-treatment-of-patients-with-menorrhagia-a-retrospective-cohort-study
#4
Kohei Nakamura, Kentaro Nakayama, Kaori Sanuki, Toshiko Minamoto, Tomoka Ishibashi, Emi Sato, Hitomi Yamashita, Masako Ishikawa, Satoru Kyo
This study aimed to describe the long-term outcomes of patients with menorrhagia treated with microwave endometrial ablation (frequency, 2.45 GHz), as well as to identify factors associated with recurrence or re-surgery. This retrospective cohort study was conducted from 2007 to 2015 at Shimane University Hospital in Japan. Patients with severe menorrhagia and a desire to preserve their uterus were included in the study. Clinical factors associated with recurrence of menorrhagia or re-surgery were analyzed with a multivariable logistic regression model...
December 2017: Oncology Letters
https://www.readbyqxmd.com/read/29343823/methods-and-extractants-to-evaluate-silicon-availability-for-sugarcane
#5
Carlos Alexandre Costa Crusciol, Dorival Pires de Arruda, Adalton Mazetti Fernandes, João Arthur Antonangelo, Luís Reynaldo Ferracciú Alleoni, Carlos Antonio Costa do Nascimento, Otávio Bagiotto Rossato, James Mabry McCray
The correct evaluation of silicon (Si) availability in different soil types is critical in defining the amount of Si to be supplied to crops. This study was carried out to evaluate two methods and five chemical Si extractants in clayey, sandy-loam, and sandy soils cultivated with sugarcane (Saccharum spp. hybrids). Soluble Si was extracted using two extraction methods (conventional and microwave oven) and five Si extractants (CaCl2, deionized water, KCl, Na-acetate buffer (pH 4.0), and acetic acid). No single method and/or extractant adequately estimated the Si availability in the soils...
January 17, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29342953/review-of-recent-metamaterial-microfluidic-sensors
#6
REVIEW
Ahmed Salim, Sungjoon Lim
Metamaterial elements/arrays exhibit a sensitive response to fluids yet with a small footprint, therefore, they have been an attractive choice to realize various sensing devices when integrated with microfluidic technology. Micro-channels made from inexpensive biocompatible materials avoid any contamination from environment and require only microliter-nanoliter sample for sensing. Simple design, easy fabrication process, light weight prototype, and instant measurements are advantages as compared to conventional (optical, electrochemical and biological) sensing systems...
January 15, 2018: Sensors
https://www.readbyqxmd.com/read/29341699/emission-of-nonclassical-radiation-by-inelastic-cooper-pair-tunneling
#7
M Westig, B Kubala, O Parlavecchio, Y Mukharsky, C Altimiras, P Joyez, D Vion, P Roche, D Esteve, M Hofheinz, M Trif, P Simon, J Ankerhold, F Portier
We show that a properly dc-biased Josephson junction in series with two microwave resonators of different frequencies emits photon pairs in the resonators. By measuring auto- and intercorrelations of the power leaking out of the resonators, we demonstrate two-mode amplitude squeezing below the classical limit. This nonclassical microwave light emission is found to be in quantitative agreement with our theoretical predictions, up to an emission rate of 2 billion photon pairs per second.
September 29, 2017: Physical Review Letters
https://www.readbyqxmd.com/read/29337879/microwave-backscatter-based-wireless-temperature-sensor-fabricated-by-an-alumina-backed-au-slot-radiation-patch
#8
Fei Lu, Haixing Wang, Yanjie Guo, Qiulin Tan, Wendong Zhang, Jijun Xiong
A wireless and passive temperature sensor operating up to 800 °C is proposed. The sensor is based on microwave backscatter RFID (radio frequency identification) technology. A thin-film planar structure and simple working principle make the sensor easy to operate under high temperature. In this paper, the proposed high temperature sensor was designed, fabricated, and characterized. Here the 99% alumina ceramic with a dimension of 40 mm × 40 mm × 1 mm was prepared in micromechanics for fabrication of the sensor substrate...
January 16, 2018: Sensors
https://www.readbyqxmd.com/read/29337681/dissipation-dynamics-of-terbuthylazine-in-soil-during-the-maize-growing-season
#9
Sanja Stipičević, Gordana Mendaš, Marija Dvoršćak, Sanja Fingler, Natalija Galzina, Klara Barić
Ever since terbuthylazine (TBA) replaced atrazine in herbicide crop treatment, its much greater persistence has raised considerable environmental concern. The aim of our field experiment was to establish the dissipation dynamics of TBA and its degradation product desethylterbuthylazine (DET) in soil over five months of maize growth. We applied TBA as part of pre-emergent treatment in the regular and double-the-regular amounts. Soil samples were collected periodically at the following depths: 0-10 cm, 10-20 cm, 20-30 cm, and 30-50 cm...
December 20, 2017: Arhiv za Higijenu Rada i Toksikologiju
https://www.readbyqxmd.com/read/29337547/a-calix-n-arene-catalysed-three-component-povarov-reaction-microwave-assisted-synthesis-of-julolidines-and-mechanistic-insights
#10
Paula Aline da Silva Abranches, Walysson Ferreira de Paiva, Angelo DE Fatima, Felipe Terra Martins, Sergio Antonio Fernandes
A new one-pot cascade reaction-based application of Povarov reactions (MCPRs) with a p-sulfonic acid calix[4]arene (CX4SO3H) catalyst for the synthesis of a series of 34 julolidines derivatives with substituents at C8 or C9 in good to excel-lent yields is reported. These microwave-assisted reactions proceed efficiently, had short reaction times, were metal-free, were low cost, and used an inexpensive, easily available and nontoxic catalyst. These advantages, along with a simple work-up procedure, make this protocol a very efficient and green alternative to the traditional methods for constructing these types of N-heterocyclic skeletons...
January 16, 2018: Journal of Organic Chemistry
https://www.readbyqxmd.com/read/29337089/thermal-field-distributions-of-ablative-experiments-using-cyst-mimicking-phantoms-comparison-of-microwave-and-radiofrequency-ablation
#11
Xiao-Wen Huang, Fang Nie, Zeng-Cheng Wa, Hang-Tong Hu, Qing-Xiu Huang, Huan-Ling Guo, Qiao Zheng, Xiao-Yan Xie, Wei Wang, Ming-De Lu
RATIONALE AND OBJECTIVES: The objective of this study was to explore the thermal field distribution of cystic lesions undergoing microwave ablation (MWA) and radiofrequency ablation (RFA) using in vitro phantoms. MATERIALS AND METHODS: Cyst-mimicking lesions filled with sodium chloride (NaCl) solution in acrylamide phantoms were treated with MWA and RFA in vitro. The radiofrequency electrodes or MWA antennas were implanted in the centers of the artificial cystic lesions...
January 11, 2018: Academic Radiology
https://www.readbyqxmd.com/read/29336351/microwave-absorption-properties-of-reduced-graphene-oxide-strontium-hexaferrite-poly-methyl-methacrylate-composites
#12
Snaghmitra Acharya, Jayashree Ray, T Umasankar Patro, Prashant Alegaonkar, Suwarna Datar
To design microwave absorber material for eradication of electromagnetic (EM) pollution the key factors are; absorption of incident EM wave and good impedance matching. By keeping these things in mind, flexible microwave absorber composite films are fabricated by simple gel casting techniques by considering reduced graphene oxide (RGO) and strontium ferrite (SF) in poly (methyl methacrylate) (PMMA) matrix. SF nanoparticles are synthesized by well known sol-gel method. Subsequently, reduced graphene oxide (RGO) and SF nanocomposite (RGOSF) are prepared through chemical reduction method by using hydrazine...
January 16, 2018: Nanotechnology
https://www.readbyqxmd.com/read/29335654/microwave-squid-multiplexer-demonstration-for-cosmic-microwave-background-imagers
#13
B Dober, D T Becker, D A Bennett, S A Bryan, S M Duff, J D Gard, J P Hays-Wehle, G C Hilton, J Hubmayr, J A B Mates, C D Reintsema, L R Vale, J N Ullom
Key performance characteristics are demonstrated for the microwave SQUID multiplexer (µmux) coupled to transition edge sensor (TES) bolometers that have been optimized for cosmic microwave background (CMB) observations. In a 64-channel demonstration, we show that the µmux produces a white, input referred current noise level of [Formula: see text] at -77 dB microwave probe tone power, which is well below expected fundamental detector and photon noise sources for a ground-based CMB-optimized bolometer. Operated with negligible photon loading, we measure [Formula: see text] in the TES-coupled channels biased at 65% of the sensor normal resistance...
December 2017: Applied Physics Letters
https://www.readbyqxmd.com/read/29335183/microwave-assisted-synthesis-of-palladium-nanoparticles-intercalated-nitrogen-doped-reduced-graphene-oxide-and-their-electrocatalytic-activity-for-direct-ethanol-fuel-cells
#14
Rajesh Kumar, Everson T S G da Silva, Rajesh K Singh, Raluca Savu, Andrei V Alaferdov, Leandro C Fonseca, Lory C Carossi, Arvind Singh, Sarita Khandka, Kamal K Kar, Oswaldo L Alves, Lauro T Kubota, Stanislav A Moshkalev
Palladium nanoparticles decorated reduced graphene oxide (Pd-rGO) and palladium nanoparticles intercalated inside nitrogen doped reduced graphene oxide (Pd-NrGO) hybrids have been synthesized by applying a very simple, fast and economic route using microwave-assisted in-situ reduction and exfoliation method. The Pd-NrGO hybrids materials show good activity as catalyst for ethanol electro oxidation for direct ethanol fuel cells (DEFCs) as compared to Pd-rGO hybrids. The enhanced direct ethanol fuel cell can serve as alternative to fossil fuels because it is renewable and environmentally-friendly with a high energy conversion efficiency and low pollutant emission...
January 8, 2018: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/29335064/real-time-assessment-of-cytosolic-mitochondrial-and-nuclear-calcium-levels-change-in-rat-pheochromocytoma-cells-during-pulsed-microwave-exposure-using-a-genetically-encoded-calcium-indicator
#15
Shao Hua Hu, Hui Wang, Li Lu, Hong Mei Zhou, Chang Zhen Wang, Ya Bing Gao, Ji Dong, Rui Yun Peng
Little information is available about the effects of exposure to pulsed microwaves on neuronal Ca2+ signaling under non-thermal conditions. In this study, rat pheochromocytoma (PC12) cells were exposed to pulsed microwaves for 6 min at a specific absorption rate (SAR) of 4 W/kg to assess possible real-time effects. During microwave exposure, free calcium dynamics in the cytosol, mitochondria, and nucleus of cells were monitored by time-lapse microfluorimetry using a genetically encoded calcium indicator (ratiometric-pericam, ratiometric-pericam-mt, and ratiometric-pericam-nu)...
December 2017: Biomedical and Environmental Sciences: BES
https://www.readbyqxmd.com/read/29334096/microwave-induced-covalent-functionalization-of-few-layer-graphene-with-arynes-under-solvent-free-conditions
#16
M V Sulleiro, S Quiroga, D Peña, D Pérez, E Guitián, A Criado, M Prato
A non-conventional modification of exfoliated few-layer graphene (FLG) with different arynes under microwave (MW) irradiation and solvent-free conditions is reported. The described approach allows reaching fast, efficient and mild covalent functionalization of FLG.
January 15, 2018: Chemical Communications: Chem Comm
https://www.readbyqxmd.com/read/29333553/microwave-assisted-synthesis-of-tempo-labeled-hydrogels-traceable-with-mri
#17
Emanuele Mauri, Edoardo Micotti, Arianna Rossetti, Lucio Melone, Simonetta Papa, Giulia Azzolini, Stefano Rimondo, Pietro Veglianese, Carlo Punta, Filippo Rossi, Alessandro Sacchetti
Polymer functionalization strategies have recently attracted considerable attention for several applications in biomaterials science. In particular, technological advancements in medical imaging have focused on the design of polymeric matrices to improve non-invasive approaches and diagnostic accuracy. In this scenario, the use of microwave irradiation of aqueous solutions containing appropriate combinations of polymers is gaining increasing interest in the synthesis of sterile hydrogels without using monomers, eliminating the need to remove unreacted species...
January 15, 2018: Soft Matter
https://www.readbyqxmd.com/read/29333389/influence-of-cooking-methods-on-bioactive-compound-content-and-antioxidant-activity-of-brussels-sprouts
#18
Eun-Sun Hwang
The effects of different cooking methods on total bioactive compound content were determined, and in vitro antioxidant activity in 80% ethanolic extracts of Brussels sprouts was evaluated by spectrophotometric methods. Compared to uncooked, steamed, and microwaved Brussels sprouts extracted with 80% ethanol contained higher amounts of total polyphenols. Uncooked Brussels sprouts contained the highest amounts of total flavonoids. Microwaved Brussels sprouts contained the highest amounts of total carotenoids (0...
December 2017: Preventive Nutrition and Food Science
https://www.readbyqxmd.com/read/29332997/epr-uniform-field-signal-enhancement-by-dielectric-tubes-in-cavities
#19
James S Hyde, Richard R Mett
The dielectric tube resonator (DTR) for EPR spectroscopy is introduced. It is defined as a metallic cylindrical TE011 microwave cavity that contains a dielectric tube centered on the axis of the cylinder. Contour plots of dimensions of the metallic cylinder to achieve resonance at 9.5 GHz are shown for quartz, sapphire, and rutile tubes as a function of wall thickness and average radius. These contour plots were developed using analytical equations and confirmed by finite element modeling. They can be used in two ways: design of the metallic cylinder for use at 9...
December 2017: Applied Magnetic Resonance
https://www.readbyqxmd.com/read/29332954/determination-of-the-boltzmann-constant-with-cylindrical-acoustic-gas-thermometry-new-and-previous-results-combined
#20
X J Feng, J T Zhang, H Lin, K A Gillis, J B Mehl, M R Moldover, K Zhang, Y N Duan
We report a new determination of the Boltzmann constant kB using a cylindrical acoustic gas thermometer. We determined the length of the copper cavity from measurements of its microwave resonance frequencies. This contrasts with our previous work (Zhang et al 2011 Int. J. Thermophys.32 1297, Lin et al 2013 Metrologia50 417, Feng et al 2015 Metrologia52 S343) that determined the length of a different cavity using two-color optical interferometry. In this new study, the half-widths of the acoustic resonances are closer to their theoretical values than in our previous work...
October 2017: Metrologia
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