bluuebunny/crossref_metadata_2025_split huggingface dataset:
Profile and Outcome of Patients with Acute Cholangitis in a Tertiary Center in South India
Authors: Raghhupatruni Prasanth , Gopalakrishna Rajesh , Ankarath Vinodkumar , Sadasivan Shine 
Published: November 2021

Abstract
Background The mainstay of management of acute cholangitis includes endoscopic or percutaneous biliary drainage and antimicrobial therapy. We aimed to study the profile and outcomes among patients with acute cholangitis who underwent endoscopic biliary drainage at our center.
Methods Seventy consecutive patients with acute cholangitis diagnosed and managed as per the Tokyo Guidelines 2018 for acute cholangitis between June 1, 2018 to December 31, 2019 were prospectively studied. Clinical, etiological and microbial profile, therapy, and patient outcomes were analyzed.
Results Choledocholithiasis (54.3%) and benign biliary stricture (28.6%) and malignancy (17.1%) were common etiological factors. Thirteen patients (18.6%) had underlying chronic liver disease. Moderate-to-severe cholangitis was seen in 67.7% of patients with high and very high grade as compared with 54.5% with medium grade of Charlson comorbidity index (CCI) and 41.2% of patients with low grade of CCI. Elevated C-reactive protein, low albumin, and prolonged international normalized ratio were associated with severe cholangitis. Bile culture was positive in 62.9% and blood culture was positive in 15.7% of patients. Bile cultures were predominantly polymicrobial in contrast to blood cultures (53.8 vs. 18%). Escherichia coli was the predominant isolate in blood and bile. Multidrug resistant (MDR) organisms were seen in 79.5% of positive bile cultures.
Conclusions A positive blood or bile culture, but not presence of multiple organisms or presence of MDR organisms in bile, was associated with severity of cholangitis. There was no mortality among these patients in-hospital or at 28-days.
Isotopic shift in magic nuclei within relativistic mean-field formalism
Authors: Amrit Pattnaik Jeet , Bhuyan M , Panda R N , Patra S K 
Published: November 2021

Abstract
The ground-state properties such as binding energy, root-mean-square radius, pairing energy, nucleons density distribution, symmetry energy, and single-particle energies are calculated for the isotopic chain of Ca, Sn, Pb, and Z = 120 nuclei. The recently developed G3 and IOPB-I forces along with the DD-ME1 and DD-ME2 sets are used in the analysis employing the relativistic mean-field approximation. To locate the magic numbers in the superheavy region and to explain the observed kink at neutron number N = 82 for Sn isotopes, a three-point formula is used to see the shift of the observable and other nuclear properties in the isotopic chain. Unlike the electronic configuration, due to strong spin-orbit interaction, the higher spin orbitals are occupied earlier than the lower spin, causing the possible kink at the neutron magic numbers. We find peaks at the known neutron magic number with the confirmation of sub-shell, shell closure respectively at N = 40, 184 for Ca and 304120.
How a projectively flat geometry regulates F(R)-gravity theory?
Authors: Loo Tee-How , De Avik , Mandal Sanjay , Sahoo P K 
Published: November 2021

Abstract
In the present paper we examine a projectively flat spacetime solution of F(R)-gravity theory. It is seen that once we deploy projective flatness in the geometry of the spacetime, the matter field has constant energy density and isotropic pressure. We then make the condition weaker and discuss the effects of projectively harmonic spacetime geometry in F(R)-gravity theory and show that the spacetime in this case reduces to a generalised Robertson-Walker spacetime with a shear, vorticity, acceleration free perfect fluid with a specific form of expansion scalar presented in terms of the scale factor. Role of conharmonic curvature tensor in the spacetime geometry is also briefly discussed. Some analysis of the obtained results are conducted in terms of couple of F(R)-gravity models.
Optimization of leaky-wave surface coil current using an analytical approach
Authors: Balafendiev R. , Zalipaev V. , Glybovski S. , Solomakha G. 
Published: November 2021

Abstract
In this work, we investigate the optimal coefficients of the exponential current excited on a leaky wave surface coil. The respective functional is first derived analytically and later computed numerically using Python. The results are compared to the same problem modeled in Comsol Multiphysics.
Guided exciton-polaritons in a subwavelength dielectric slab integrated with a 2D semiconductor
Authors: Benimetskiy F. , Yulin A. , Kravtsov V. , Mikhin A. , Iorsh I. , Samusev A. , Krizhanovskii D. N. 
Published: November 2021

Abstract
New-generation nonlinear planar polaritonic devices based on 2D semiconductors demonstrate great potential for a wide range of practical applications. In this work, we experimentally study strong light–matter coupling between waveguide photons and excitons in a photonic system based on dielectric slab waveguides integrated with 2D transition metal dichalcogenides.
Nonlinear imaging of whispering gallery modes in GaN microwires
Authors: Berdnikov Yury , Shtrom Igor , Rozhavskaya Maria , Lundin Wsevolod , Hendricks Nicholas , Grange Rachel , Timofeeva Maria 
Published: November 2021

Abstract
In this work non-scanning far-field nonlinear optical microscopy is employed to study the whispering gallery modes in tapered GaN microwire resonators. We demonstrate the confinement of whispering gallery modes under near-infrared excitation with the photon energy close to half of GaN bandgap. Our results indicate the enhancement of yellow-green luminescence by whispering gallery modes in GaN microwires.
Machine learning methods for Precipitable Water Vapor estimation by radiometric data in millimetre wavelength
Authors: Bubnov Grigoriy , Zemlyanukha Peter , Dombek Evgeniy , Vdovin Vyacheslav 
Published: November 2021

Abstract
This work deals with the first try to calculate the amount of Precipitable Water Vapor (PWV) in atmosphere by using machine learning and AI methods. We use the detector voltages series measured by radiometric system “MIAP-2” as the initial data for machine learning. The radiometer MIAP-2 works by “atmospheric dip method” in 2mm and 3mm atmospheric transparency windows. We also have PWV data series collected by Water Vapor Radiometer and GNSS receiver for data validation. The best convergence results were demonstrated by the independent component analysis (ICA) method with coefficient of determination R2= 0.53 and artificial neural network method (ANN) with R2= 0.8. These methods allow to reduce the systematic errors due to direct PWV calculation from raw radiometric data avoiding unnecessary steps opacity calculation.
EBG waveguides for contactless surface impedance measurements
Authors: Rodini Sandra , Genovesi Simone , Manara Giuliano , Costa Filippo 
Published: November 2021

Abstract
A method for the estimation of sheet impedance of thin sample which does not require a direct contact with the sample under test is proposed. The surface impedance is calculated through an inversion procedure exploiting the scattering parameters obtained through a waveguide measurement setup. An inversion procedure based on the representation of the waveguide-air-waveguide section as a π junction is employed. In order to prevent the field leakage from the air gap created for hosting the thin sheet, an EBG surface is introduced on the flange of the waveguide. It is shown that the introduction of the EBG surface remarkably improves the estimation of the surface impedance of the thin sheet with respect to the case without EBG.
Wave propagation control in active acoustic metamaterials
Authors: Bacigalupo A. , De Bellis M. L. , Gnecco G. , Misseroni D. 
Published: November 2021

Abstract
Focus is on the design of an innovative class of tunable periodic metamaterials, conceived for the realization of high performance acoustic metafilters with settable real-time capabilities. In this framework the tunability is due to the presence of a piezoelectric phase shunted by a suitable electrical circuit with adjustable impedance/admittance. It follows that the acoustic properties of the metamaterial can be properly modified in an adaptive way, opening up new possibilities for the control of pass- and stop-bands.
Asymptotic homogenization of metamaterials elastic plates
Authors: Faraci David , Comi Claudia 
Published: November 2021

Abstract
The asymptotic homogenization technique is applied to evaluate the effective properties of thin plates with periodic heterogeneity. The effect of shear deformation in the homogenization process is evidenced and the role of cell slenderness, besides that of the plate, is clarified by several numerical analyses.
Temperature monitoring during light-induced release of cargo using polymer capsules modified with gold nanoparticles and nanodiamonds
Authors: Gerasimova E N , Yaroshenko V V , Talianov P M , Peltek O O , Mikhailova L V , Baranov M A , Kapitanova P V , Zuev D A , Timin A S , Zyuzin M V 
Published: November 2021

Abstract
Application of different light-sensitive drug delivery carriers is limited due to a risk of overheating of living cells. Therefore, a real-time temperature monitoring within biological objects that controls the photothermal release of different cargos from light-sensitive carriers is highly demanded. In this work, we develop a multifunctional platform comprised of polymer microcapsules modified with nitrogen vacancies (NV) centers as nanothermometers and gold (Au) nanoparticles (NPs) as heating elements for the realization of laser-induced cargo release with a simultaneous temperature measurement inside cells. Such platform allows to prevent unwanted side effects related with the overheating of living cells and tissues.
Scattering of generalized Bessel beams simulated with the discrete dipole approximation
Authors: Glukhova S A , Yurkin M A 
Published: November 2021

Abstract
We consider the simulation of scattering of the high-order vector Bessel beams in the discrete dipole approximation framework (DDA). For this purpose, a new general classification of all existing Bessel beam types was developed based on the superposition of transverse Hertz vector potentials. Next, we implemented these beams in ADDA code – an open-source parallel implementation of the DDA. The code enables easy and efficient simulation of Bessel beams scattering by arbitrary-shaped particles. Moreover, these results pave the way for the following research related to the Bessel beam scattering near a substrate and optical forces.
Rayleigh imaging along an optical fiber in operation
Authors: Haddad Y , Chrétien J , Margueron S , Beugnot J C , Fanjoux G 
Published: November 2021

Abstract
We present in this work a non-destructive and non-invasive imaging spectroscopic technique with a high spatial and spectral resolution to characterize the light propagation behaviour along a centimetric length and nanometric size tapered optical fiber in operation.
Irradiation-induced Kondo resonance in two-dimensional electron systems
Authors: Iorsh I. V. , Kibis O. V. 
Published: November 2021

Abstract
We demonstrated theoretically that formation of the resonant scattering states in the two-dimensional (2D) electron system irradiated by a circularly polarized electromagnetic field leads to the emergence of localized magnetic moments. As a consequence, the corresponding Kondo resonances appear. For GaAs-based quantum wells and microwave fields, we estimate the Kondo temperature around 2.5 K, which can be detected in state-of-the-art measurements.
Various multipole combinations for conical Si particles
Authors: Kuznetsov A V , Canós Valero A , Terekhov P D , Shamkhi H K 
Published: November 2021

Abstract
In this work, we investigated the possibility of creating various multipole combinations in conical silicon nanoparticles. It was found that in conical silicon particles it seems possible to create key effects for nanophotonics, such as various kinds of Kerker effects (Generalized Kerker, Transverse Kerker), Hybrid anapole state, Bound states in the continuum. This greatly simplifies the manufacturing process of photonic devices due to the easier production of nanocones in practice. Also, conical particles allow an additional degree of freedom, which opens up new horizons for obtaining previously unknown effects.
Miniaturized all-angle accessible RIFD tag
Authors: Mikhailovskaya Anna , Yusupov Ildar , Dobrykh Dmitry , Krasikov Sergey , Shakirova Diana , Bogdanov Andrey , Filonov Dmitry , Ginzburg Pavel 
Published: November 2021

Abstract
Radio frequency identification (RFID) is one of the commonly used approaches to a short-range wireless data exchange. Numerous passive RFID tags are available on the market, and in a vast majority of cases, their designs are based on flat meandered dipole architectures. However, besides technological advantages, those realizations suffer from polarization mismatch issues and limited spatial sectors, from which flat tags can be interrogated. Here, we demonstrate and analyze a miniature omnidirectional tag accessible from all 4π stereo angles with a commercial RFID reader.
Flexible Electrode Formed by Patterned Layers of Single-Walled Carbon Nanotubes for Optoelectronic Applications
Authors: Mitin D M , Vorobyev A A , Berdnikov Y S , Raudik S A , Mozharov A M , Nasibulin A G , Mukhin I S 
Published: November 2021

Abstract
The technology of creating patterned flexible electrodes based on single-walled carbon nanotubes and polydimethylsiloxane was demonstrated in this paper. A series of experiments were carried out to study whether the percolation affects the conductivity of patterned SWCNT layers. It was found that in patterns with the linewidth above 1 μm and the cell size above 50 μm the random character of SWCNT networks may be neglected. The impact of bending on the grid conductivity was studied. We observed a very moderate increase of resistance below 5% under the strain up to 4 %, which is comparable with the previous results for continuous SWCNT layers and shows the improvement in comparison with the previous reports on patterned SWCNT layers.
Silicon nanowire/polymer membrane for infrared visualization via third-harmonic generation
Authors: Nikolaeva Anna , Fedorov Vladimir V. , Gudovskikh Alexander S. , Morozov Ivan A. , Mastalieva Viktoria , Neplokh Vladimir , Mukhin Ivan S. , Makarov Sergey V. 
Published: November 2021

Abstract
Nonlinear harmonic generation in nanostructures is one of the key topics in nanophotonics, as it allows infrared-to-visible light conversion at the nanoscale.his work reports on the efficient third-harmonic generation in a free-standing Si nanowire array encapsulated into a polymer membrane. High nonlinearity of Si material X
31112.45 ≈ 10 –19m2
/V
2 and light coupling with optical resonances in the nanowires yield a strong third-harmonic signal and efficient infrared (1200 — 2000nm) to visible (400 — 666nm) upconversion. The fabricated membranes demonstrate high flexibility and semitransparency, which makes them convenient to use as visualizers.
Design and fabrication of photoactive ZnO-MgO-Ag nanocomposites for medical and environmental applications
Authors: Nikonorov N V , Evstropiev S K , Shelemanov A V , Podruhin J F , Kiselev V M , Karavaeva A V 
Published: November 2021

Abstract
Photoactive and bactericidal ZnO-MgO-Ag nanocomposites have been synthesized by liquid polymer-salt method. Polyvinylpyrrolidone plays a double role during nanocomposites synthesis: as the stabilizing component at initial solutions stages and as a fuel during materials calcination. Prepared materials demonstrate the ability to generate chemically active singlet oxygen under UV irradiation. Developed nanocomposites are promising for different medical and environmental application.
Thin-Film Frustrated Total Internal Reflection Filter with Plasmonic Nanoparticle Inclusions in the Layers
Authors: Petrov N I 
Published: November 2021

Abstract
The influence of plasmonic nanoparticles embedded in the central and side layers of the frustrated total internal reflection filter on the resonant transmission of light is analyzed. It is shown that the frequency dispersion causes the splitting of the filter bandwidth and the angular splitting of the incident beam into several output beams.
Direct laser writing method for micro-lens fabrication on the fiber facet
Authors: Pisarenko A.V. , Kolymagin D.A. , Zvagelsky R.D. , Merkushev D.D. , Shcherbakov D. A. , Chubich D.A. , Vitukhnovsky A.G. 
Published: November 2021

Abstract
We present a way for micro-lens and micro-lens array fabrication on the fiber facet by direct laser writing (DLW) method. The proposed setup for DLW printing on the fiber facet can protect objective lens and makes it possible to safely using a wide range of resists. Microlens fabricated on the single-mode optical fiber facet is demonstrated. Based on lens-on-fiber system we proposed concept of the micro-lenses on baseplate array printed on the multi-core fiber, where each lens is rigidly aligned with the core. One of the possible micro-lenses on the baseplate array is presented and its optical properties such as focal spot size and resolution are investigated. The possible application of the proposed micro-lens array is complex optical elements, such as micro-objectives with optimized optical design. Moreover, suggested freeform lens array can find application in high-accuracy wavefront sensing.
Time-varying metamaterials and metasurfaces for antennas and propagation applications
Authors: Ramaccia D. , Toscano A. , Bilotti F. 
Published: November 2021

Abstract
In this contribution we present the most recent results from our group about the opportunities offered by time-varying metamaterials and metasurfaces for conceiving antenna systems and devices exhibiting artificial non-reciprocity, frequency conversion, energy accumulation and temporal electromagnetic scattering. Such artificial metastructures are characterized by constitutive parameters (permittivity, permeability and/or surface impedance) that are modulated in time through an external control or requires modulated excitation signal for enabling anomalous scattering behaviour. Here, we briefly describe the physical insights of the unusual interaction arising between the electromagnetic field and such metamaterials and metasurfaces, and then we present some antennas and propagation applications, showing the performances of non-reciprocal antenna systems, magnet-less isolators, Doppler cloaks, temporal devices and metasurface-based virtual absorbers.
A perturbation theory approach to the ground state exciton energy in the limit of a weak magnetic field in anomalous exciton Hall effect
Authors: Shabashov V A , Kozin V K , Kavokin A V , Shelykh I A 
Published: November 2021

Abstract
The anomalous exciton Hall effect is a phenomenon that occurs in a quantum well in the presence of an external magnetic field applied perpendicular to the surface due to the interaction of the exciton dipole moment with an electric field, formed by the charged impurities. The effect was fully described in [1] for different magnetic field regimes. In this paper, we focus on the way the perturbation method was used for finding the ground state energy of an exciton in the limit of a weak magnetic field.
Spatial mapping of optical modes in plasmonic nanoantenna by scanning tunneling microscopy
Authors: Shkoldin V A , Lebedev D V , Mozharov A M , Permyakov D V , Dvoretckaia L N , Golubok A O , Bogdanov A A , Samusev A K , Mukhin I S 
Published: November 2021

Abstract
Using of inelastic electron tunnelling is very promising approach to study of subwavelength photons and plasmons sources. Such sources are very important for improving of on-chip data processing. One of the ways for development of efficient and compact optical electrically-driven sources is using of nanoantenna placed into the tunnel junction. In this work, singe optical nanoantenna was investigated under ultra-high vacuum and ambient conditions. Photon maps of nanoantenna excited under scanning tunnel microscope tip was observed and the obtained results was compared with the theoretical predictions of electromagnetic near-field distribution.
Photonic dualism of icosahedral quasicrystals
Authors: Sinelnik A D , Shishkin I I , Yu X , Samusev K B , Belov P A , Limonov M F , Ginzburg P B , Rybin M V 
Published: November 2021

Abstract
Here we report on fabrication of 3D submicron-size dielectric icosahedral quasicrystals and show a photonic dualism of these structures. Relying on far-field measurements, we found pronounced patterns of unconventional Bragg diffraction, which indicates the existence of multiple photonic pseudogaps.
Phase-Sensitive Optical Coherence Microscopy of Integrated Nanophotonics Devices
Authors: Sirotin Maxim A. , Lyubin Evgeny V. , Safronov Kirill R. , Akhremenkov Daniil V. , Bessonov Vladimir O. , Soboleva Irina V. , Fedyanin Andrey A. 
Published: November 2021

Abstract
We report on the development of a new approach for studying the internal structure of polymer integrated nanophotonics devices using phase-sensitive optical coherence microscopy. Visualization and flaw detection of devices and their internal structure was carried out using the example of coupling gratings and prisms for a miniature Otto configuration with a characteristic gap height of 50-300 nm.
Wideband Coil Based on Microstrip Line for Multiheteronuclear Magnetic Resonance Spectroscopy
Authors: Solomakha G. , Egorova N. , Balafendiev R. , Simovski C. , Glybovski S. 
Published: November 2021

Abstract
Magnetic Resonance Spectroscopy of X-nucleus is a method for mapping metabolite quantity in-vivo in the desired region of the human body. However, this method has a lot of difficulties. Since natural abundance of X-nucleus is much lower than for hydrogen, to improve SNR of the spectrum we need to work in higher static magnetic fields. But, even at such high fields, X-nuclei imaging still a very difficult process. One of the problems are RF-coils, which are required for transmission and reception of signals. Traditionally, for human body X-nuclei MRS multi-tuned loop coils are used. However, such coils suffer from additional losses in the circuits required for double-frequency tuning and high complexity. In this work, we propose an alternative approach, based on a recently introduced leaky-wave antenna for MRI, that allows creating wideband excitation which provides wideband transmit and receive. This wideband frequency range covering 13C, 23Na and 31P Larmor resonant frequencies.
Tuneable photoluminescence of TBAPY-based Metal-Organic Complex
Authors: Timofeeva Maria V. , Bachinin Semyon V. , Milichko Valentin A. 
Published: November 2021

Abstract
We report the synthesis of crystals of an organic metal complex based on a large redox-active ligand (tbapy) exhibiting luminescent properties. We have demonstrated the tuning of the luminescence of a Zn-based metal-organic complex, soaked in advance in dimethylformamide, with pumping light.
Magnetic resonance imaging with a multi-tunable metamaterial-inspired radiofrequency coil
Authors: Puchnin V , Ivanov V , Gulyaev M , Zubkov M 
Published: November 2021

Abstract
We present the initial experimental results obtained using a two-part receive/transmit (Rx/Tx) radiofrequency (RF) coil design for small animals magnetic resonance imaging at 7 T. The assembly uses a butterfly-type coil tuned to 300 MHz for scanning the 1H nuclei and a non-resonant antenna with a metamaterial-inspired resonator tunable over wide frequency range for X-nuclei. 1H, 31P, 23Na and 13C are selected as test nuclei in this work. Coil simulations show the two parts of the RF-assembly to be efficiently operating at the required frequencies. Simulations and phantom imaging show sufficiently homogeneous transverse transmit RF fields and tuning capabilities for the pilot heteronuclear experiments.