keyword
MENU ▼
Read by QxMD icon Read
search

transitions

keyword
https://www.readbyqxmd.com/read/28437996/high-contrast-switchability-of-vo-sub-2-sub-based-metamaterial-absorbers-with-ito-ground-plane
#1
Jitendra K Pradhan, S Anantha Ramakrishna, Bharathi Rajeswaran, Arun M Umarji, Venu Gopal Achanta, Amit K Agarwal, Amitava Ghosh
A metamaterial consisting of an array of gold micro-disks, separated from a ground plane of indium tin oxide (ITO) by a thin film of vanadium dioxide (VO<sub>2</sub>), behaves as a perfect absorber at infrared (IR) frequencies at room temperature. This metamaterial, which is transparent to visible light, can be switched to a highly reflecting state for IR light by heating the metamaterial to temperatures larger than the metal-insulator phase transition temperature 68°C of VO<sub>2</sub>...
April 17, 2017: Optics Express
https://www.readbyqxmd.com/read/28437963/raman-gain-and-femtosecond-laser-induced-damage-of-ge-as-s-chalcogenide-glasses
#2
Yan Zhang, Yinsheng Xu, Chenyang You, Dong Xu, Junzhou Tang, Peiqing Zhang, Shixun Dai
Chemical stoichiometric Ge-As-S glasses were prepared, and their thermal properties, refractive index (n), optical bandgap, Raman gain, and femtosecond laser damage were examined. Results revealed that the n and density (ρ) of the glasses decreased as Ge concentration increased, whereas the bandgap and glass transition temperature (Tg) increased. The Raman gain coefficients (g<sub>R</sub>) of the samples were calculated on the basis of spontaneous Raman scattering spectra. g<sub>R</sub> decreased from 2...
April 17, 2017: Optics Express
https://www.readbyqxmd.com/read/28437950/maximum-likelihood-sequence-estimation-for-optical-complex-direct-modulation
#3
Di Che, Feng Yuan, William Shieh
Semiconductor lasers are versatile optical transmitters in nature. Through the direct modulation (DM), the intensity modulation is realized by the linear mapping between the injection current and the light power, while various angle modulations are enabled by the frequency chirp. Limited by the direct detection, DM lasers used to be exploited only as 1-D (intensity or angle) transmitters by suppressing or simply ignoring the other modulation. Nevertheless, through the digital coherent detection, simultaneous intensity and angle modulations (namely, 2-D complex DM, CDM) can be realized by a single laser diode...
April 17, 2017: Optics Express
https://www.readbyqxmd.com/read/28437930/si-traceable-measurement-of-an-optical-frequency-at-the-low-10-sup-16-sup-level-without-a-local-primary-standard
#4
Hidekazu Hachisu, Gérard Petit, Fumimaru Nakagawa, Yuko Hanado, Tetsuya Ido
SI-traceable measurements of optical frequencies using International Atomic Time (TAI) do not require a local primary frequency reference, but suffer from an uncertainty in tracing to the SI second. For the measurement of the <sup>87</sup>Sr lattice clock transition, we have reduced this uncertainty to the low 10<sup>-16</sup> level by averaging three sets of ten-day intermittent measurements, in which we operated the lattice clock for 10<sup>4</sup> s on each day. Moreover, a combined oscillator of two hydrogen masers was employed as a local flywheel oscillator (LFO) in order to mitigate the impact of sporadic excursion of LFO frequency...
April 17, 2017: Optics Express
https://www.readbyqxmd.com/read/28437928/terahertz-optical-bistability-of-graphene-in-thin-layers-of-dielectrics
#5
Kwang Jun Ahn, Fabian Rotermund
We theoretically studied in terahertz frequency regime optical bistability of graphene placed at the interface between thin dielectric layers. We solved self-consistently the nonlinear wave equations containing the third-order optical conductivity of graphene in four-layer structures and obtained hysteresis response of the transmitted power as a function of the incident power. We numerically observed that the critical powers for the up and down transitions and the Fermi-energy of graphene required for terahertz optical bistability can be reduced by carefully choosing material properties and the thicknesses of dielectric layers...
April 17, 2017: Optics Express
https://www.readbyqxmd.com/read/28437924/synthesis-and-luminescence-properties-of-ba-sub-3-sub-lu-po-sub-4-sub-sub-3-sub-sm-sup-3-sup-phosphor-for-white-light-emitting-diodes
#6
Zaifa Yang, Denghui Xu, Jiayue Sun
A series of Ba<sub>3</sub>Lu(PO<sub>4</sub>)<sub>3</sub>:Sm<sup>3+</sup> phosphors were prepared by traditional high temperature solid-state reaction methods. The site-preferred occupancy of Sm<sup>3+</sup> in Ba<sub>3</sub>Lu(PO<sub>4</sub>)<sub>3</sub> and the luminescence properties of Ba<sub>3</sub>Lu(PO<sub>4</sub>)<sub>3</sub>:Sm<sup>3+</sup> were studied combined with X-ray diffraction, photoluminescence excitation (PLE) spectra, and emission (PL) spectra as well as temperature-dependent PL and decay curves...
April 17, 2017: Optics Express
https://www.readbyqxmd.com/read/28437910/excitation-enhancement-in-electric-multipole-transitions-near-a-nanoedge
#7
Kosuke Shibata, Satoshi Tojo, Daniel Bloch
We investigate enhancement of electric multipole excitations of atoms in the vicinity of an object with a nanoscale edge resulted from a large electromagnetic field gradient. We calculate the excitation efficiencies of a Rb atom around a nanoedge and find the excitations are enhanced by several orders of magnitude. The efficiencies with the change in the magnetic quantum number resolved are also examined. Each resolved efficiency shows rotationally symmetric spatial distribution, with continuous modification in shape from the far field to the near field...
April 17, 2017: Optics Express
https://www.readbyqxmd.com/read/28437894/effect-of-anisotropic-electron-momentum-distribution-of-surface-plasmon-on-internal-photoemission-of-a-schottky-hot-carrier-device
#8
Xin-Hao Li, Jeffrey B Chou, Wei Lek Kwan, Asma M Elsharif, Sang-Gook Kim
We recently reported that an Au/TiO<sub>2</sub> photonic crystal device for photochemical energy conversion showed a sub-bandgap photoresponse centered at the surface plasmon polariton (SPP) resonant wavelength of this device. Here we developed a theoretical modeling of the internal photoemission in this device by incorporating the effects of anisotropic hot electron momentum distribution caused by SPP. The influences of interband and intraband transition, anisotropic momentum distribution of hot electrons by SPP are integrated to model the internal quantum efficiency (IQE) of this device...
April 17, 2017: Optics Express
https://www.readbyqxmd.com/read/28437870/assessing-the-likelihood-and-magnitude-of-a-population-health-benefit-following-the-market-introduction-of-a-modified-risk-tobacco-product-enhancements-to-the-dynamic-population-modeler-dpm-1
#9
Annette M Bachand, Sandra I Sulsky, Geoffrey M Curtin
Researchers and those responsible for evaluating and implementing policies intended to reduce population harm must assess the potential for both intended and unintended consequences associated with those policies. Such assessments should be based on the combined dimensions of magnitude, and thus likelihood, of shifts in exposure patterns needed to produce a population benefit or harm, and magnitude of the expected population benefit or harm. In response to this assessment need, we provide a conceptual description of the dynamic population modeler, DPM(+1), as well as illustrative analyses that estimate the effects on all-cause mortality, life expectancy, and quality of life-adjusted life expectancy if exposure patterns in the population shift from a higher risk product (e...
April 24, 2017: Risk Analysis: An Official Publication of the Society for Risk Analysis
https://www.readbyqxmd.com/read/28437720/determination-of-a-novel-anticancer-ampk-activator-hernandezine-in-rat-plasma-and-tissues-with-a-validated-uhplc-ms-ms-method-application-to-pharmacokinetics-and-tissue-distribution-study
#10
Yang Song, Zhibin Wang, Baozhen Zhang, Yujia Zhang, Weipeng Zhang, Chunjuan Yang, Fanhao Meng, Xuesong Feng
Hernandezine, a novel anticancer AMPK activator, is a major active constituent of Thalictrum Ranunculaceae. A simple, specific and sensitive liquid chromatography tandem mass spectrometry (LC-MS/MS) method has been developed and validated for the quantification of hernandezine in rat plasma and tissues after intravenous administration. Sample preparation was carried out through a protein-precipitation extraction with acetonitrile using tetrandrine as internal standard (IS). The chromatographic separation was achieved by using an Agilent ZORBAX Eclipse Plus C18 column with a mobile phase of acetonitrile and water (containing 10mM ammonium acetate) in an isocratic elution way...
April 8, 2017: Journal of Pharmaceutical and Biomedical Analysis
https://www.readbyqxmd.com/read/28437706/three-phases-in-ph-dependent-heme-abstraction-from-myoglobin
#11
Sohini Mukherjee, Manjistha Mukherjee, Sabyasachi Bandyopadhyay, Abhishek Dey
The extent of heme extraction from myoglobin (Mb) by methylethyl ketone is found to be pH dependent and show three distinct phases. Parallel investigations of the protein using resonance Raman (rR) and circular dichroism (CD) across these pH regions indicate that these phases correspond to three different protonation steps in holoMb as the pH of the solution changed. The first transition occurs between pH5-6 and is due to the protonation of one of the heme propionate groups which disrupts its H-bonding with Arg 45 in the loop...
April 9, 2017: Journal of Inorganic Biochemistry
https://www.readbyqxmd.com/read/28437611/dynamical-insights-in-the-decomposition-of-1-2-dioxetane
#12
Morgane Vacher, Anders M Brakestad, Hans O Karlsson, Ignacio Fdez Galván, Roland Lindh
Chemiluminescence in 1,2-dioxetane occurs via a thermally-activated decomposition reaction into two formaldehyde molecules. Both ground state and non-adiabatic dynamics (including singlet excited states) of the decomposition reaction have been simulated, starting from the first O-O bond breaking transition structure. The ground state dissociation occurs between t=30 fs and t=140 fs. The so-called entropic trap leads to frustrated dissociations, postponing the decomposition reaction. Specific geometrical conditions are necessary for the trajectories to escape from the entropic trap and for dissociation to be possible...
April 24, 2017: Journal of Chemical Theory and Computation
https://www.readbyqxmd.com/read/28437585/chronic-intestinal-electrical-stimulation-improves-glucose-intolerance-and-insulin-resistance-in-diet-induced-obesity-rats
#13
Shiying Li, Weijian Zhu, Sujuan Zhang, Jiande Dz Chen
OBJECTIVE: Obesity is a contributing factor to insulin resistance and type 2 diabetes. The aim of this study was to study the therapeutic potential of intestinal electrical stimulation (IES) for obesity and associated glucose intolerance and insulin resistance in diet-induced obesity (DIO) rats. METHODS: DIO rats were divided into two groups to receive sham or IES for 8 weeks. Oral glucose tolerance and insulin tolerance tests were performed. Gastric emptying and small bowel transit tests were performed...
April 24, 2017: Obesity
https://www.readbyqxmd.com/read/28437473/molecular-simulations-and-markov-state-modeling-reveal-the-structural-diversity-and-dynamics-of-a-theophylline-binding-rna-aptamer-in-its-unbound-state
#14
Becka M Warfield, Peter C Anderson
RNA aptamers are oligonucleotides that bind with high specificity and affinity to target ligands. In the absence of bound ligand, secondary structures of RNA aptamers are generally stable, but single-stranded and loop regions, including ligand binding sites, lack defined structures and exist as ensembles of conformations. For example, the well-characterized theophylline-binding aptamer forms a highly stable binding site when bound to theophylline, but the binding site is unstable and disordered when theophylline is absent...
2017: PloS One
https://www.readbyqxmd.com/read/28437458/isomalto-oligosaccharides-ameliorate-visceral-hyperalgesia-with-repair-damage-of-ileal-epithelial-ultrastructure-in-rats
#15
Weida Wang, Haiwei Xin, Xiucai Fang, Hongtao Dou, Fangyi Liu, Dan Huang, Shaomei Han, Guijun Fei, Liming Zhu, Shenghua Zha, Hong Zhang, Meiyun Ke
BACKGROUND: Treatment of irritable bowel syndrome (IBS) with probiotics has achieved effectiveness to a certain extent. Whether prebiotics will work is still unclear. This study aimed to investigate the therapeutic effects of the prebiotic isomalto-oligosaccharides (IMO) on visceral hypersensitivity (VHS) in rats and to explore potential mechanism. METHODS: Water avoidance stress (WAS) was used to induce VHS in rats. The score for the abdominal withdrawal reflex (AWR) was determined while colorectal distension and compared between VHS group and control group in order to validate VHS preparation...
2017: PloS One
https://www.readbyqxmd.com/read/28437294/sleep-detriments-associated-with-quick-returns-in-rotating-shift-work-a-diary-study
#16
Øystein Vedaa, Erik Mørland, Marit Larsen, Anette Harris, Eilin Erevik, Børge Sivertsen, Bjørn Bjorvatn, Siri Waage, Ståle Pallesen
OBJECTIVE: We aimed to compared sleep characteristics associated with quick returns (QRs, <11 hours between shift intervals) with those associated with other common shift transitions. METHODS: Sixty-seven nurses completed a 2-week work and sleep diary (94.0% female, mean age 47.7 years). A multilevel fixed effects model was used to examine the sleep in QRs compared with two consecutive night shifts, two consecutive evening shifts, and two consecutive day shifts, respectively...
April 21, 2017: Journal of Occupational and Environmental Medicine
https://www.readbyqxmd.com/read/28437261/training-in-intraoperative-handover-and-display-of-a-checklist-improve-communication-during-transfer-of-care-an-interventional-cohort-study-of-anaesthesia-residents-and-nurse-anaesthetists
#17
Marion Jullia, Anaïs Tronet, Fabiola Fraumar, Vincent Minville, Olivier Fourcade, Xavier Alacoque, Yannick LeManach, Matt M Kurrek
BACKGROUND: Handovers during anaesthesia are common, and failures in communication may lead to morbidity and mortality. OBJECTIVES: We hypothesised that intraoperative handover training and display of a checklist would improve communication during anaesthesia care transition in the operating room. DESIGN: Interventional cohort study. SETTING: Single-centre tertiary care university hospital. PARTICIPANTS: A total of 204 random observations of handovers between anaesthesia providers (residents and nurse anaesthetists) over a 6-month period in 2016...
April 21, 2017: European Journal of Anaesthesiology
https://www.readbyqxmd.com/read/28437253/charge-transfer-driven-emergent-phenomena-in-oxide-heterostructures
#18
Hanghui Chen, Andrew Millis
Complex oxides exhibit many intriguing phenomena, including metal-insulator transition, ferroelectricity/multiferroicity, colossal magnetoresistance and high transition temperature superconductivity. Advances in epitaxial thin film growth techniques enable us to combine different complex oxides with atomic precision and form an oxide heterostructure. Recent theoretical and experimental work has shown that charge transfer across oxide interfaces generally occurs and leads to a great diversity of emergent interfacial properties which are not exhibited by bulk constituents...
April 24, 2017: Journal of Physics. Condensed Matter: An Institute of Physics Journal
https://www.readbyqxmd.com/read/28437219/factors-affecting-sexual-function-in-midlife-women-results-from-the-midlife-women-s-health-study
#19
Rebecca L Smith, Lisa Gallicchio, Jodi A Flaws
OBJECTIVE: The objective of this study was to estimate the importance of risk factors affecting sexual function in sexually active midlife women. MATERIALS AND METHODS: A cohort of 780 women undergoing the menopausal transition was surveyed each year for up to 7 years. Data were collected from sexually active women on sexual function, including frequencies of enjoyment, arousal, orgasm, passion for partner, satisfaction with partner, pain, lack of lubrication, fantasizing, and sexual activity...
February 28, 2017: Journal of Women's Health
https://www.readbyqxmd.com/read/28437163/going-beyond-being-lost-in-transition-a-decade-of-progress-in-cancer-survivorship
#20
Larissa Nekhlyudov, Patricia A Ganz, Neeraj K Arora, Julia H Rowland
No abstract text is available yet for this article.
April 24, 2017: Journal of Clinical Oncology: Official Journal of the American Society of Clinical Oncology
keyword
keyword
2258
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"