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https://www.readbyqxmd.com/read/28241672/structural-behaviour-of-solid-solutions-in-the-ndalo3-srtio3-system
#1
Natalia Ohon, Roman Stepchuk, Kostiantyn Blazhivskyi, Leonid Vasylechko
Single-phase mixed aluminates-titanates Nd1-x Sr x Al1-x Ti x O3 (x = 0.3 ÷ 0.9) were prepared from stoichiometric amounts of constituent oxides Nd2O3, Al2O3, TiO2 and strontium carbonate SrCO3 by solid-state reaction technique in air at 1773 K. Crystal structure parameters of Nd1-x Sr x Al1-x Ti x O3 were refined by full-profile Rietveld refinement in space groups R [Formula: see text] c (x = 0.3, 0.5, 0.7 and 0.8) and Pm [Formula: see text] m (x = 0.9). Comparison of the obtained structural parameters with the literature data for the end members of the system NdAlO3 and SrTiO3 revealed formation of two kinds of solid solutions Nd1-xSrxAl1-xTixO3 with the cubic and rhombohedral perovskite structure...
December 2017: Nanoscale Research Letters
https://www.readbyqxmd.com/read/28241649/iterative-compensation-of-nonlinear-error-of-heterodyne-interferometer
#2
Jiandong Xie, Liping Yan, Benyong Chen, Shihua Zhang
In order to compensate the nonlinear error of a heterodyne interferometer caused by both frequency mixing and phase demodulating electronics in real time, a novel iterative algorithm with a digital lock-in phase demodulator is proposed in this paper. By using iterative translating and scaling transforms, the phase diagram of the two output signals from phase demodulator is corrected from an ellipse with center offset to a circle at origin. As a result, the correct phase can be obtained and the nonlinear error is compensated...
February 20, 2017: Optics Express
https://www.readbyqxmd.com/read/28241613/regrowth-free-integration-of-injection-locked-slotted-laser-with-an-electroabsorption-modulator
#3
Niall P Kelly, Ludovic Caro, Mohamad Dernaika, Frank H Peters
Optical injection locking was used to red shift an integrated semiconductor laser up to 30 nm away from the main free running lasing mode. This injection locking of the laser beyond its band edge enabled its integration with an electroabsorption modulator to produce a 2.5 Gb/s eye diagram. The electroabsorption modulator was shown to have a 3 dB bandwidth of 5.5 GHz, which was limited by the contact capacitance. This paper demonstrates that such devices could be applied in a regrowth free, monolithic coherent wavelength division multiplexing transmitter...
February 20, 2017: Optics Express
https://www.readbyqxmd.com/read/28240919/graphic-methods-for-interpreting-longitudinal-dyadic-patterns-from-repeated-measures-actor-partner-interdependence-models
#4
Nicholas S Perry, Katherine J W Baucom, Stacia Bourne, Jonathan Butner, Alexander O Crenshaw, Jasara N Hogan, Zac E Imel, Travis J Wiltshire, Brian R W Baucom
Researchers commonly use repeated-measures actor-partner interdependence models (RM-APIM) to understand how romantic partners change in relation to one another over time. However, traditional interpretations of the results of these models do not fully or correctly capture the dyadic temporal patterns estimated in RM-APIM. Interpretation of results from these models largely focuses on the meaning of single-parameter estimates in isolation from all the others. However, considering individual coefficients separately impedes the understanding of how these associations combine to produce an interdependent pattern that emerges over time...
February 27, 2017: Journal of Family Psychology: JFP
https://www.readbyqxmd.com/read/28237984/effect-of-a-quality-improvement-program-to-improve-guideline-adherence-and-attainment-of-clinical-standards-in-dialysis-care-report-of-outcomes-in-year-1
#5
Sajeda Youssouf, Azri Nache, Chandrakumaran Wijesekara, Rachel J Middleton, David Lewis, Aladdin E Shurrab, Edmond O'Riordan, Lesley P Lappin, Donal O'Donoghue, Philip A Kalra, Janet Hegarty
BACKGROUND: Best practice in dialysis is synthesised in clear international guidelines. However, a large gap remains between the international guidelines and the actual delivery of care. In this paper, we report outcomes for the first year of a multifaceted dialysis improvement programme in our network. METHODS: One year collaborative involving 3 haemodialysis units and a peritoneal dialysis (PD) programme involving 299 dialysis patients. Each unit addressed a different indicator (unit A - catheter-related bloodstream infection [CRBSI], unit B - pre-dialysis blood pressure [BP], unit C - dialysis dose, unit D - anaemia) with a shared aim to match the top 10% in the UK...
February 25, 2017: Nephron
https://www.readbyqxmd.com/read/28235997/centrifugeless-dispersive-liquid-liquid-microextraction-based-on-salting-out-phenomenon-as-an-efficient-method-for-determination-of-phenolic-compounds-in-environmental-samples
#6
Ehsan Mirparizi, Maryam Rajabi, Mohammad Bazregar, Alireza Asghari
A new centrifugeless dispersive liquid-liquid microextraction (DLLME) method was applied for the convenient extraction of some phenolic compounds from environmental samples. After dispersing the extracting solvent into the sample solution (10.0 mL), the mixture was passed through a small column filled with 5 g sodium chloride. As a result, phase separation was achieved via the salting-out phenomenon, and the extracting solvent was suspended on top of the sample solution. Using a low-toxic and solidifiable extracting solvent (1-dodecanol), after immersing the column into an ice bath, the extracting solvent was solidified, collected easily, and injected into an HPLC-UV instrument...
February 24, 2017: Analytical and Bioanalytical Chemistry
https://www.readbyqxmd.com/read/28231012/quantum-percolation-and-magnetic-nano-droplet-states-in-electronically-phase-separated-manganite-nanowires
#7
Kaixuan Zhang, Lin Li, Hui Li, Qiyuan Feng, Nan Zhang, Long Cheng, Xiaodong Fan, Yubin Hou, Qingyou Lu, Zhenyu Zhang, Changgan Zeng
One-dimensional (1D) confinement has been revealed to effectively tune the properties of materials in homogeneous states. The 1D physics can be further enriched by electronic inhomogeneity, which unfortunately remains largely unknown. Here we demonstrate the ultra-high sensitivity to magnetic fluctuations and the tunability of phase stability in the electronic transport properties of self-assembled electronically phase-separated manganite nanowires with extreme aspect ratio. The onset of magnetic nano-droplet state, a precursor to the ferromagnetic metallic state, is unambiguously revealed, which is attributed to the small lateral size of the nanowires that is comparable to the droplet size...
February 23, 2017: Nano Letters
https://www.readbyqxmd.com/read/28229556/identification-of-clusters-of-foot-pain-location-in-a-community-sample
#8
Tiffany K Gill, Hylton B Menz, Karl B Landorf, John B Arnold, Anne W Taylor, Catherine L Hill
OBJECTIVE: To identify foot pain clusters according to pain location in a community based sample of the general population. METHODS: This study analysed data from the North West Adelaide Health Study. Data were obtained between 2004-2006, using Computer Assisted Telephone Interviewing, clinical assessment and self-completed questionnaire. The location of foot pain was assessed using a diagram during the clinical assessment. Hierarchical cluster analysis was undertaken to identify foot pain location clusters, which were then compared in relation to demographics, comorbidities and podiatry utilisation...
February 23, 2017: Arthritis Care & Research
https://www.readbyqxmd.com/read/28229357/experimental-determination-and-theoretical-calculation-of-the-eutectic-composition-of-cefuroxime-axetil-diastereomers
#9
Namita Dalal, Ira S Buckner, Peter L D Wildfong
Cefuroxime axetil (CFA), an ester prodrug of cefuroxime exists as a pair of diastereoemers, namely isomer A and isomer B. To enable phase diagram construction, crystallization of the diastereomers of CFA from the commercially available amorphous drug substance was carried out. Isomer A was separated with a purity approaching 100% whereas the maximum purity of isomer B was 85% as confirmed by solution state proton NMR spectroscopy. The crystalline forms of isomer A and isomer B were confirmed as forms AI and BI, respectively, based on differential scanning calorimetry (DSC) analysis and powder X-ray diffraction...
February 22, 2017: AAPS PharmSciTech
https://www.readbyqxmd.com/read/28228240/modeling-spreading-of-oil-slicks-based-on-random-walk-methods-and-voronoi-diagrams
#10
İsmail Durgut, Mark Reed
We introduce a methodology for representation of a surface oil slick using a Voronoi diagram updated at each time step. The Voronoi cells scale the Gaussian random walk procedure representing the spreading process by individual particle stepping. The step length of stochastically moving particles is based on a theoretical model of the spreading process, establishing a relationship between the step length of diffusive spreading and the thickness of the slick at the particle locations. The Voronoi tessellation provides the areal extent of the slick particles and in turn the thicknesses of the slick and the diffusive-type spreading length for all particles...
February 19, 2017: Marine Pollution Bulletin
https://www.readbyqxmd.com/read/28228036/estimation-of-the-critical-behavior-in-an-active-colloidal-system-with-vicsek-like-interactions
#11
Benjamin Trefz, Jonathan Tammo Siebert, Thomas Speck, Kurt Binder, Peter Virnau
We study numerically the critical behavior of a modified, active Asakura-Oosawa model for colloid-polymer mixtures. The colloids are modeled as self-propelled particles with Vicsek-like interactions. This system undergoes phase separation between a colloid-rich and a polymer-rich phase, whereby the phase diagram depends on the strength of the Vicsek-like interactions. Employing a subsystem-block-density distribution analysis, we determine the critical point and make an attempt to estimate the critical exponents...
February 21, 2017: Journal of Chemical Physics
https://www.readbyqxmd.com/read/28228029/predicting-low-temperature-free-energy-landscapes-with-flat-histogram-monte-carlo-methods
#12
Nathan A Mahynski, Marco A Blanco, Jeffrey R Errington, Vincent K Shen
We present a method for predicting the free energy landscape of fluids at low temperatures from flat-histogram grand canonical Monte Carlo simulations performed at higher ones. We illustrate our approach for both pure and multicomponent systems using two different sampling methods as a demonstration. This allows us to predict the thermodynamic behavior of systems which undergo both first order and continuous phase transitions upon cooling using simulations performed only at higher temperatures. After surveying a variety of different systems, we identify a range of temperature differences over which the extrapolation of high temperature simulations tends to quantitatively predict the thermodynamic properties of fluids at lower ones...
February 21, 2017: Journal of Chemical Physics
https://www.readbyqxmd.com/read/28226633/autonomous-vision-guided-approach-for-the-analysis-and-grading-of-vertical-suspension-tests-during-hammersmith-infant-neurological-examination-hine
#13
Prasenjit Dey, Debi Prosad Dogra, Partha Pratim Roy, Harish Bhaskar, Prasenjit Dey, Debi Prosad Dogra, Partha Pratim Roy, Harish Bhaskar, Debi Prosad Dogra, Harish Bhaskar, Prasenjit Dey, Partha Pratim Roy
Computer vision assisted diagnostic systems are gaining popularity in different healthcare applications. This paper presents a video analysis and pattern recognition framework for the automatic grading of vertical suspension tests on infants during the Hammersmith Infant Neurological Examination (HINE). The proposed vision-guided pipeline applies a color-based skin region segmentation procedure followed by the localization of body parts before feature extraction and classification. After constrained localization of lower body parts, a stick-diagram representation is used for extracting novel features that correspond to the motion dynamic characteristics of the infant's leg movements during HINE...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28226214/selective-encaging-of-n2o-in-n2o-n2-binary-gas-hydrates-via-hydrate-based-gas-separation
#14
Youjeong Yang, Donghoon Shin, Seunghyun Choi, Yesol Woo, Jong-Won Lee, Dongseon Kim, Hee-Young Shin, Minjun Cha, Ji-Ho Yoon
The crystal structure and guest inclusion behaviors of nitrous oxide-nitrogen (N2O-N2) binary gas hydrates formed from N2O/N2 gas mixtures are determined through spectroscopic analysis. Powder X-ray diffraction results indicate that the crystal structure of all the N2O-N2 binary gas hydrates is identified as the structure I (sI) hydrate. Raman spectra for N2O-N2 binary gas hydrate formed from N2O/N2 (80/20, 60/40, 40/60 mol %) gas mixtures reveal that N2O molecules occupy both large and small cages of the sI hydrate...
February 22, 2017: Environmental Science & Technology
https://www.readbyqxmd.com/read/28225945/-satisfaction-and-perceived-quality-of-people-insured-by-the-social-health-protection-in-mexico-methodological-foundations
#15
Pedro J Saturno-Hernández, Juan Pablo Gutiérrez-Reyes, Waldo Ivan Vieyra-Romero, Martín Romero-Martínez, Gabriel Jaime O'Shea-Cuevas, Javier Lozano-Herrera, Sonia Tavera-Martínez, Mauricio Hernández-Ávila
Objective: To describe the conceptual framework and methods for implementation and analysis of the satisfaction survey of the Mexican System for Social Protection in Health. Materials and methods: We analyze the methodological elements of the 2013, 2014 and 2015 surveys, including the instrument, sampling method and study design, conceptual framework, and characteristics and indicators of the analysis. Results: The survey captures information on perceived quality and satisfaction...
November 2016: Salud Pública de México
https://www.readbyqxmd.com/read/28225626/combined-experimental-and-theoretical-approach-to-the-kinetics-of-magnetite-crystal-growth-from-primary-particles
#16
Marc Widdrat, Emanuel Schneck, Victoria Reichel, Jens Baumgartner, Luca Bertinetti, Wouter Habraken, Klaas Bente, Peter Fratzl, Damien Faivre
It is now recognized that nucleation and growth of crystals can occur not only by the addition of solvated ions but also by accretion of nanoparticles, in a process called nonclassical crystallization. The theoretical framework of such processes has only started to be described, partly due to the lack of kinetic or thermodynamic data. Here, we study the growth of magnetite nanoparticles from primary particles-nanometer-sized amorphous iron-rich precursors-in aqueous solution at different temperatures. We propose a theoretical framework to describe the growth of the nanoparticles and model both a diffusion-limited and a reaction-limited pathway to determine which of these best describes the rate-limiting step of the process...
February 23, 2017: Journal of Physical Chemistry Letters
https://www.readbyqxmd.com/read/28225053/genetically-predicted-milk-consumption-and-bone-health-ischemic-heart-disease-and-type-2-diabetes-a-mendelian-randomization-study
#17
Q Yang, S L Lin, S L Au Yeung, M K Kwok, L Xu, G M Leung, C M Schooling
BACKGROUND/OBJECTIVES: Milk provides protein and micronutrients, and is recommended by some dietary guidelines, particularly for bone health. Meta-analysis of small randomized controlled trials suggests that milk may increase bone mineral density, but they are very heterogeneous. No randomized controlled trial has assessed the effects of milk on major chronic diseases. Previous Mendelian randomization studies of milk did not consider bone health, found no effects on ischemic heart disease (IHD) or type 2 diabetes (T2D) but higher body mass index...
February 22, 2017: European Journal of Clinical Nutrition
https://www.readbyqxmd.com/read/28225042/magneto-transport-spectroscopy-of-the-first-and-second-two-dimensional-subbands-in-al0-25ga0-75n-gan-quantum-point-contacts
#18
Fangchao Lu, Ning Tang, Liangliang Shang, Hongming Guan, Fujun Xu, Weikun Ge, Bo Shen
Magnetic transport spectroscopy is investigated in quantum point contacts (QPCs) fabricated in Al0.25Ga0.75N/GaN heterostructures. The magnetic field perpendicular to the two-dimensional electron gas (2DEG) is shown to depopulate the quasi-one-dimensional energy levels in the first two-dimensional (2D) subband faster than those in the second one. In GaN based heterostructures, the energy levels in the second 2D subband is generally concealed in the fast course of depletion and hence rarely detected. The perpendicular magnetic field facilitates the observation of the second 2D subband, and provides a method to study the properties of these energy levels...
February 22, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28224984/abnormal-strong-burn-in-degradation-of-highly-efficient-polymer-solar-cells-caused-by-spinodal-donor-acceptor-demixing
#19
Ning Li, José Darío Perea, Thaer Kassar, Moses Richter, Thomas Heumueller, Gebhard J Matt, Yi Hou, Nusret S Güldal, Haiwei Chen, Shi Chen, Stefan Langner, Marvin Berlinghof, Tobias Unruh, Christoph J Brabec
The performance of organic solar cells is determined by the delicate, meticulously optimized bulk-heterojunction microstructure, which consists of finely mixed and relatively separated donor/acceptor regions. Here we demonstrate an abnormal strong burn-in degradation in highly efficient polymer solar cells caused by spinodal demixing of the donor and acceptor phases, which dramatically reduces charge generation and can be attributed to the inherently low miscibility of both materials. Even though the microstructure can be kinetically tuned for achieving high-performance, the inherently low miscibility of donor and acceptor leads to spontaneous phase separation in the solid state, even at room temperature and in the dark...
February 22, 2017: Nature Communications
https://www.readbyqxmd.com/read/28224391/development-and-evaluation-of-a-nanoemulsion-containing-ursolic-acid-a-promising-trypanocidal-agent-nanoemulsion-with-ursolic-acid-against-t-cruzi
#20
Erika Cristina Vargas de Oliveira, Zumira Aparecida Carneiro, Sérgio de Albuquerque, Juliana Maldonado Marchetti
Over a hundred years after the discovery of Chagas disease, this ailment continues to affect thousands of people. For more than 40 years, only two drugs have been available to treat it. Ursolic acid is a naturally occurring terpene that has shown a good trypanocidal action. However, the hydrophobicity of this compound presents a challenge for the development of proper delivery systems. Nanostructured systems are a prominent in delivering lipophilic drugs. Thus, a nanoemulsion containing ursolic acid was developed and had its trypanocidal activity and cytotoxicity evaluated...
February 21, 2017: AAPS PharmSciTech
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