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Yogesh Gawale, Nagaiyan Sekar
Density Functional Theory and Time Dependent Density Functional Theory computations reveal experimental trends accurately and provide an insight into the origin of red shifted optical spectra, large Stokes shift, nonlinear optical responses and quantitative description of the singlet-triplet energy gap of recently synthesized highly fluorescent membrane permeable benz[c,d]indole N-heteroarene BF2 rigidified BBN and BBC dyes. Our results benchmark the importance of the DFT functionals and polarization functions using the accurate basis set for the calculations of excitation energies, band gaps, dipole moment, non-linear optical properties and geometrical parameters...
December 7, 2017: Journal of Photochemistry and Photobiology. B, Biology
Jin Hyun Lim, Jun Young Kim, Dong Woo Kang, Kyu Hwan Choi, Seong Jae Lee, Sang Hyuk Im, Bum Jun Park
Heterogeneous capillary interactions between ellipsoid particles at the oil-water interface were measured via optical laser tweezers. Two trapped particles were aligned in either tip-to-tip (tt) or side-to-side (ss) configurations via the double-trap method and were released from the optical traps, leading to particle-particle attractions due to the capillary forces caused by quadrupolar interface deformation. Based on image analysis and calculations of the Stokes drag force, the capillary interactions between two ellipsoid particles with the same aspect ratio (E) were found to vary with the particle pairs that were measured, indicating that the interactions were non-deterministic or heterogeneous...
December 12, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
T S van den Bremer, Ø Breivik
During its periodic motion, a particle floating at the free surface of a water wave experiences a net drift velocity in the direction of wave propagation, known as the Stokes drift (Stokes 1847 Trans. Camb. Philos. Soc.8, 441-455). More generally, the Stokes drift velocity is the difference between the average Lagrangian flow velocity of a fluid parcel and the average Eulerian flow velocity of the fluid. This paper reviews progress in fundamental and applied research on the induced mean flow associated with surface gravity waves since the first description of the Stokes drift, now 170 years ago...
January 28, 2018: Philosophical Transactions. Series A, Mathematical, Physical, and Engineering Sciences
Motohiko Umeyama
To investigate changes in the instability of Stokes waves prior to wave breaking in shallow water, pressure data were recorded vertically over the entire water depth, except in the near-surface layer (from 0 cm to -3 cm), in a recirculating channel. In addition, we checked the pressure asymmetry under several conditions. The phase-averaged dynamic-pressure values for the wave-current motion appear to increase compared with those for the wave-alone motion; however, they scatter in the experimental range...
January 28, 2018: Philosophical Transactions. Series A, Mathematical, Physical, and Engineering Sciences
Tony Lyons
In this paper, we consider the dynamic pressure in a deep-water extreme Stokes wave. While the presence of stagnation points introduces a number of mathematical complications, maximum principles are applied to analyse the dynamic pressure in the fluid body by means of an excision process. It is shown that the dynamic pressure attains its maximum value beneath the wave crest and its minimum beneath the wave trough, while it decreases in moving away from the crest line along any streamline.This article is part of the theme issue 'Nonlinear water waves'...
January 28, 2018: Philosophical Transactions. Series A, Mathematical, Physical, and Engineering Sciences
Thomas A Alanine, Stephen Stokes, Craig A Roberts, James S Scott
A palladium mediated C-H aziridination reaction of 3,3,5,5-substituted-piperazin-2-ones has been developed using phenyliodonium diacetate (PIDA) and succinic acid to give synthetically useful bicyclic aziridines, in moderate to good yields. Succinic acid was found to be key for selectively promoting C-N bond formation (aziridination) and suppressing competitive acetoxylation. Analysis of the reaction kinetics revealed the role of succinic acid in promoting an equilibrium between monomeric and dimeric palladium species in the rate determining step of the reaction...
December 11, 2017: Organic & Biomolecular Chemistry
Kenneth O Inaku, Obasola O Ogunkeye, Fayeofori M Abbiyesuku, Evelyn K Chuhwak, Christian O Isichei, Lucius C Imoh, Noel O Amadu, Alexander O Abu
Background: The global prevalence of type 2 diabetes is increasing. Dyslipidaemia is a known complication of diabetes mellitus manifesting frequently as cardiovascular diseases and stoke. Elevation of small, dense low density lipoprotein has been recognised as a component of the atherogenic lipoprotein phenotype associated with cardiovascular complications. We speculate that the elevation of this lipoprotein particle may be the antecedent of the atherogenic lipoprotein phenotype. This study therefore aims to determine the pattern of dyslipidaemia among diabetes mellitus patients in Jos, North-Central Nigeria...
2017: BMC Clinical Pathology
L J Cooper, K R Daly, P D Hallett, M Naveed, N Koebernick, A G Bengough, T S George, T Roose
The parameters in Richards' equation are usually calculated from experimentally measured values of the soil-water characteristic curve and saturated hydraulic conductivity. The complex pore structures that often occur in porous media complicate such parametrization due to hysteresis between wetting and drying and the effects of tortuosity. Rather than estimate the parameters in Richards' equation from these indirect measurements, image-based modelling is used to investigate the relationship between the pore structure and the parameters...
November 2017: Proceedings. Mathematical, Physical, and Engineering Sciences
Matthew T Stier, R Stokes Peebles
No abstract text is available yet for this article.
December 2017: Annals of Allergy, Asthma & Immunology
Matthew T Stier, Jian Zhang, Kasia Goleniewska, Jacqueline Y Cephus, Mark Rusznak, Lan Wu, Luc Van Kaer, Baohua Zhou, Dawn C Newcomb, R Stokes Peebles
Group 2 innate lymphoid cells (ILC2s) are effector cells within the mucosa and key participants in type 2 immune responses in the context of allergic inflammation and infection. ILC2s develop in the bone marrow from common lymphoid progenitor cells, but little is known about how ILC2s egress from the bone marrow for hematogenous trafficking. In this study, we identified a critical role for IL-33, a hallmark peripheral ILC2-activating cytokine, in promoting the egress of ILC2 lineage cells from the bone marrow...
December 8, 2017: Journal of Experimental Medicine
Eslam El-Fiky, Mohamed Osman, Mohammed Sowailem, Alireza Samani, David Patel, Rui Li, Md G Saber, Yun Wang, Nicolas Abadia, Yannick D'Mello, David V Plant
We present a dual-polarization O-band silicon photonic (SiP) transmitter for intra-datacenter optical interconnects. The transmitter is built using two identical O-band traveling wave Mach-Zehnder modulators with an average VπL and a bandwidth at 1.5 V bias voltage of 2.88 and 24.5 GHz, respectively. We experimentally demonstrate the transmitter in a Stokes vector direct-detection (SV-DD) system for dual-polarization intensity modulated signals with 2-level and 4-level pulse amplitude modulation (DP-PAM2 and DP-PAM4) formats...
November 27, 2017: Optics Express
Andrew Flood, Nazir P Kherani
The effect of various design and material parameters on the efficiency of stimulated emission-based luminescent solar concentrators (SELSCs) is studied numerically using a 4-level luminescent material containing concentrator. It is shown that the most efficient SELSCs have emission wavelengths of 1.5-1.8 µm, with a strong dependence on the Stokes shift. Depending on the parameters of the system, spontaneous emission is shown to nevertheless account for a significant fraction of potential energy generation...
November 27, 2017: Optics Express
Nir Gavish, Doron Elad, Arik Yochelis
The increasing number of experimental observations on highly concentrated electrolytes and ionic liquids show qualitative features that are distinct from dilute or moderately concentrated electrolytes, such as self-assembly, multiple-time relaxation, and under-screening, which all impact the emergence of fluid/solid interfaces, and transport in these systems. Since these phenomena are not captured by existing mean field models of electrolytes, there is a paramount need for a continuum framework for highly concentrated electrolytes and ionic liquids...
December 8, 2017: Journal of Physical Chemistry Letters
Sarah M Greening, Katherine N Robertson, Alison Thompson
A series of synthetic analogs of the tripyrrolic natural product prodigiosin were complexed with boron trifluoride to generate the corresponding F-BODIPYs. The maximum wavelengths of absorption and emission of the pyrrolyldipyrrin F-BODIPYs were tuned through variation of the substituents about the pyrrolyldipyrrinato core. The limited variation of substituents on the C-ring did not significantly affect absorption and emission. However, variation of substituents on the B-ring and A-ring resulted in a corresponding red-shift in absorption and emission reaching maximum wavelengths of 600 nm...
December 8, 2017: Photochemical & Photobiological Sciences
Anna Deminger, Eva Klingberg, Mattias Lorentzon, Mats Geijer, Jan Göthlin, Martin Hedberg, Eva Rehnberg, Hans Carlsten, Lennart T Jacobsson, Helena Forsblad-d'Elia
BACKGROUND: Studies have shown increased prevalence of osteoporosis and increased risk for vertebral fractures in patients with ankylosing spondylitis (AS). Measurements of bone mineral density (BMD) in the lumbar spine anterior-posterior (AP) projection may be difficult to interpret due to the ligamentous calcifications, and the lateral projection might be a better measuring site. Our objectives were to investigate BMD changes after 5 years at different measuring sites in patients with AS and to evaluate disease-related variables and medications as predictors for BMD changes...
December 8, 2017: Arthritis Research & Therapy
P Harshavardhan Reddy, A V Kir'yanov, Anirban Dhar, Shyamal Das, Debjit Dutta, Mrinmay Pal, Y O Barmenkov, J A Minguella-Gallardo, Shyamal Kumar Bhadra, Mukul Chandra Paul
We report the fabrication, characterization, and application (broadband supercontinuum [SC] generation) of ultra-high numerical-aperture heavily (50 mol. %) GeO2-doped optical fiber, obtained through a modified chemical vapor deposition process and rod-in-tube method. The formation of Ge-related diamagnetic defect centers, such as germanium oxygen defect centers (GeODC) with nonbridging lone electron pairs, confirmed by x-ray photoelectron spectroscopy and optical absorption studies, inducing hypolarizable local dipoles, may be responsible in boosting the nonlinear effects and enhancing stimulated Raman scattering at pumping with high-power pulses, culminating in generation of broadband SC generation...
November 20, 2017: Applied Optics
Zhenjie Wu, Ran Liao, Xiangyu Sun, Di Zu, Wenlan Liu, Hui Tan, Shuqing Sun
The development of highly sensitive and low-cost methods for detecting DNA is of critical importance. Here, we describe a strategy for the highly sensitive and low-cost digital detection of target DNA. Individual DNA molecules were encoded with a single gold nanorod (Au NR), which was then separated and enriched using the magnetic immune-separation process, followed by dehybridization and dispersion into a buffer solution and immobilization on glass slides for polarized dark-field microscopic imaging. With the imaging we can get the first three data sets of the Stokes vector, and the experimental degree of the linear polarization of the light scattered by the Au NR was obtained...
November 20, 2017: Applied Optics
Chenquan Ni, Weiqing Gao, Xiangcai Chen, Li Chen, Yong Zhou, Wei Zhang, Jigang Hu, Meisong Liao, Takenobu Suzuki, Yasutake Ohishi
A numerical simulation of third-order cascaded Raman fiber laser based on tellurite fiber at the 2-5 μm waveband is presented. The Raman fiber laser can be optimized with the most suitable tellurite fiber length of 0.5-1.0 m and the most reasonable reflectivity of the third-order Stokes output FBG32 of 10%-20%. We demonstrate numerically that the third-order Stokes wave can reach the maximum average power of 45.2 W and the maximum optical conversion efficiency of 45.2%, corresponding to the FBG32 reflectivity of 10% and the tellurite fiber length of 0...
November 20, 2017: Applied Optics
Chenkun Zhou, Haoran Lin, Hongliang Shi, Yu Tian, Chongin Pak, Michael Shatruk, Yan Zhou, Peter Djurovich, Maohua Du, Biwu Ma
We report the synthesis and characterization of (C9NH20)2SnBr4, a novel organic metal halide hybrid with a zero-dimensional (0D) structure, in which individual seesaw-shaped tin (II) bromide anions (SnBr42-) are co-crystallized with 1-butyl-1-methylpyrrolidinium cations (C9NH20+). Upon photoexcitation, the bulk crystals exhibit a highly efficient broadband deep-red emission peaked at 695 nm, with a large Stokes shift of 332 nm and a high quantum efficiency of around 46%. The unique photophysical properties of this hybrid material are attributed to two major factors, (i) the 0D structure allowing the bulk crystals to exhibit the intrinsic properties of individual SnBr42- species, and (ii) the seesaw structure enabling a pronounced excited state structural deformation as confirmed by density functional theory (DFT) calculations...
December 7, 2017: Angewandte Chemie
C O'Halloran, N Walsh, M C O'Grady, L Barry, C Hooton, G D Corcoran, B Lucey
BACKGROUND: As many clinical laboratories convert between Stokes, Clinical and Laboratory Standards Institute (CLSI) and European Committee for Antimicrobial Susceptibility Testing (EUCAST) methods, the problem of comparing differently derived sets of antimicrobial susceptibility testing (AST) data with each other arises, owing to a scarcity of knowledge of inter-method comparability. The purpose of the current study was to determine the comparability of CLSI, EUCAST and Stokes AST methods for determining susceptibility of uropathogenic Escherichia coli to ampicillin, amoxicillin-clavulanate, trimethoprim, cephradine/cephalexin, ciprofloxacin and nitrofurantoin...
December 6, 2017: British Journal of Biomedical Science
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