bluuebunny/crossref_metadata_2025 huggingface dataset:
Peri-Urbanization in DIY and Its Relationship to Sustainable Agricultural Lands Protection Program
Authors: Nurcahyani Tita Thalia , Marwasta Djaka
Published: November 2021

One of the main issues for cities in the world today is peri-urbanization. The rate of urbanization that occurred as an impact of industrialization resulted in a rapid population increase of urban areas. The increase of urban population causes the need of space for housing and other urban facilities also increase simultaneously, while administratively, urban area is relatively constant. The consequences is, the annexation of productive agricultural lands (especially rice fields) in the suburbs by urban functions. This study attempts to examine periurbanization and its relationship with sustainable agricultural land protection programs. This study aims to (1) assess the level of peri-urbanization in DIY; and (2) Elaborate the relationship between peri-urbanization and sustainable agricultural land protection programs. The spatial approach is used in this study considering that space is an integral part of a city which is a container for various urban activities and functions. This research is also in line with the ideas of a “sustainable city” that has been proclaimed by the United Nations (UN) and all countries in the world. The results of the study show that the implementation of regional regulations on sustainable agricultural land is quite effective in holding back the pace of peri-urbanization.
Hydrogeological Characterization of the Gunungsewu Karst Area in the Upper Reach of Gremeng Karst Drainage Basin, Indonesia
Authors: Cahyadi Ahmad , Adjis Tjahyo Nugroho , Haryono Eko , Widyastuti Margaretha
Published: November 2021

The definition of a karst drainage basin in the aquifer of the karst area is an absolute thing to do as a water resource management unit. This research aimed to characterize the hydrogeology of the Gunungsewu Karst Area in the upper reach of the Gremeng Karst Drainage Basin. For this purpose, it was divided into three stages, namely geological survey, speleological survey, and artificial tracer test. The results indicate that the area observed lies in two or more geological formations: Semilir Formation, composed of sandstone and tuff from the ancient volcano Wonodadi eruptions, and Wonosari Formation, in which carbonate rocks consisting of massive coral limestone and bedded chalky limestone predominate. In volcanic rocks, the surface rivers have developed into allogenic streams flowing from underlying beds exposed updip. The contact between the two different formations results in the formation of ponors and springs. The artificial tracer test revealed two underground river systems with single conduits controlled by the allogenic rivers and large slope gradients in the study area.
The Lithofacies of Pandua Formation Shale in the Andowia Area, North Konawe, Southeast Sulawesi and Its potential as Petroleum source rock
Authors: Ramli Mawar Towan Lestari , Amijaya Hendra , Akmaluddin
Published: November 2021

Research on the Late Miocene of Pandua Formation shale in Andowia area, Southeast Sulawesi is fundamental because it is considered to have the potential as a source rock in Manui Basin. This study aimed to determine the lithofacies and its potential as petroleum source rock using megascopic, petrographic, and total organic carbon analyses in Pandua Formation shale. Based on the megascopic and petrographic analysis of outcrops, the shale can be subdivided into 11 lithofacies consists of clayey shale, massive claystone, clastic detritus-rich claystone, massive mudstone, mica-rich mudstone, iron oxide-rich mudstone, low-angle laminated mudstone, massive siltstone, carbon-rich massive siltstone, laminated siltstone, and carbon-rich laminated siltstone. The results of the analysis of 19 samples of shale showed that the total organic carbon (TOC) content was classified as poor to excellent (<0.5%- >4%). The lithofacies with a high concentration of TOC are carbon-rich massive siltstone and carbon-rich laminated siltstone. Both lithofacies were categorized as potentially excellent source rock which the TOC value content is 5.78% and 5.74%.The result implies the better understanding of the depositional environment and hydrocarbon accumulation potential of the Manui basin for future exploration.
Musculoskeletal Physiotherapy in the Emergency Department – Evaluation of a New Physiotherapy Service in a Swiss University Hospital
Authors: Winteler Balz , Geese Franziska , Lehmann Beat , Schmitt Kai-Uwe
Published: November 2021

Background Many countries report a significant increase in emergency department (ED) visits. Patients with musculoskeletal disorders account for a large proportion of non-urgent cases.

Objective Characterization and evaluation of a new service that provides immediate access to physiotherapy for patients in the ED.

Method To characterize a new service at the Department of Emergency Medicine, Bern University Hospital, and to evaluate first experiences with it, a mixed methods approach was chosen. Data was collected from the electronic patient file and from a logbook kept by the physiotherapists. In addition, guideline-based interviews with involved health care staff were conducted.

Results During the 63 days of the pilot study 79 patients were treated by physiotherapists. The most frequently reported patient complaint was back pain (47 %). Interventions included taking the medical history, performing manual tests and multimodal treatment and developing recommendations for further treatment. In 59 % of patients no medical imaging and in 58 % no additional physiotherapy was prescribed. Patients rated the physiotherapeutic service as very good or excellent (88 %). Physiotherapy was experienced as positive and appreciated by the other professions, and all interviewees emphasized the added value for patients.

Conclusion The pilot study indicates that the physiotherapeutic consultation service has the potential to improve quality of care. The findings of this study are therefore valuable when considering the introduction of such a service in an ED.
Digitalisierung in der Rehabilitation von rheumatischen Erkrankungen:
Was ist sinnvoll, was ist bewiesen, welche Perspektiven gibt es?
Authors: Sturm Christian , Schiller Jörg , Korallus Christoph , Lemhöfer Christina , Egen Christoph , Gutenbrunner Christoph
Published: November 2021

In Deutschland besteht ein deutlicher Mangel an internistischen Rheumatologen. Um
diese Versorgungslücke zu reduzieren, können verschiedene
technische Anwendungen genutzt werden. Dies reicht von der Hilfe bei der
Früherkennung und Diagnostik für Hausärzte, über
Konsilsysteme mit Telemedizin, bis hin zur Videosprechstunde mit den Patienten
nach Koordination in einem entsprechenden Netzwerk, das stufenförmig
aufgebaut ist, um die vorhandenen Spezialisten möglichst effektiv
einzusetzen. Auch Apps für die Nutzung am Smartphone oder Tablet
können sowohl Ärzte in Diagnostik und Therapie
unterstützen, aber auch vielfältig Patienten bei den jeweiligen
Krankheitsbewältigungen helfen. Eine Sonderform sind dabei
„Digitale Gesundheitsanwendungen“ (DiGAs), die geprüft
wurden und als Medizinprodukte zugelassen und verordnungsfähig sind.
Für die Unterstützung von Bewegungsübungen, wie sie bei
rheumatischen Erkrankungen so wichtig sind, kommen auch Telemedizinische
Assistenzsysteme in Betracht, bei denen über 3D-Kamera und
Computeranalyse zu Hause ein individuelles Übungsprogramm angeleitet und
kontrolliert wird. Studien zu Anwendungen und Bewertungsoptionen für
Apps liegen bereits einige vor, hier besteht aber noch hoher Nachholbedarf.
The Risk of Venous Thromboembolism Attributed to Established Prothrombotic Genotypes
Authors: Evensen Line H. , Arnesen Carl Arne Løchen , Rosendaal Frits R. , Gabrielsen Maiken E. , Brumpton Ben M. , Hveem Kristian , Hansen John-Bjarne , Brækkan Sigrid K.
Published: November 2021

Background The proportion of venous thromboembolism (VTE) events that can be attributed to established prothrombotic genotypes has been scarcely investigated in the general population. We aimed to estimate the proportion of VTEs in the population that could be attributed to established prothrombotic genotypes using a population-based case-cohort.

Methods Cases with incident VTE (n = 1,493) and a randomly sampled subcohort (n = 13,069) were derived from the Tromsø Study (1994–2012) and the Nord-Trøndelag Health (HUNT) study (1995–2008). DNA samples were genotyped for 17 single-nucleotide polymorphisms (SNPs) associated with VTE. Hazard ratios with 95% confidence intervals (CIs) were estimated in Cox regression models. Population-attributable fractions (PAFs) with 95% bias-corrected CIs (based on 10,000 bootstrap samples) were estimated using a cumulative model where SNPs significantly associated with VTE were added one by one in ranked order of the individual PAFs.

Results Six SNPs were significantly associated with VTE (rs1799963 [Prothrombin], rs2066865 [FGG], rs6025 [FV Leiden], rs2289252 [F11], rs2036914 [F11], and rs8176719 [ABO]). The cumulative PAF for the six-SNP model was 45.3% (95% CI: 19.7–71.6) for total VTE and 61.7% (95% CI: 19.6–89.3) for unprovoked VTE. The PAF for prothrombotic genotypes was higher for deep vein thrombosis (DVT; 52.9%) than for PE (33.8%), and higher for those aged <70 years (66.1%) than for those aged ≥70 years (24.9%).

Conclusion Our findings suggest that 45 to 62% of all VTE events in the population can be attributed to known prothrombotic genotypes. The PAF of established prothrombotic genotypes was higher in DVT than in PE, and higher in the young than in the elderly.
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

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.
Improving efficiency of GaN-based materials for solar cells and LEDs
Authors: McConnon Aili
Published: November 2021

Bettering the performance of the p-type region in GaN-based long-wavelength devices with a multiple-layer structure.
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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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.
Surface ferromagnetism as a basis for the creation of planar metamaterials
Authors: Nukhov A.K.
Published: November 2021

In this work, we study the influence of the surface on the energy of spin excitations of a ferromagnetic crystal in the Heisenberg model, with a particular focus on the possibility of using this effect to create planar metamaterials.
Thin-Film Frustrated Total Internal Reflection Filter with Plasmonic Nanoparticle Inclusions in the Layers
Authors: Petrov N I
Published: November 2021

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

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

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

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

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

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

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

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

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

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.
Convergence of eigenfunction expansions for flexural gravity waves in infinite water depth
Authors: Koley Santanu , Panduranga Kottala
Published: November 2021

In the present paper, point-wise convergence of the eigenfunction expansion to the velocity potential associated with the flexural gravity waves problem in water wave theory is established for infinite water depth case. To take into account the hydroelastic boundary condition at the free surface, a flexible membrane is assumed to float in water waves. In this context, firstly the eigenfunction expansion for the velocity potentials is obtained. Thereafter, an appropriate Green’s function is constructed for the associated boundary value problem. Using suitable properties of the Green’s functions, the vertical components of the eigenfunction expansion is written in terms of the Dirac delta function. Finally, using the property of the Dirac delta function, the convergence of the eigenfunction expansion to the velocity potential is shown.
Conduction mechanism in (ZnO/PVC) polymer nanocomposite
Authors: Joy Singh A
Published: November 2021

The electrical conductivity of ZnO nanoparticle doped PVC polymer of different concentrations and thickness has been investigated as a function if applied electric field and temperature. The LnJ versus E1/2 plot for the pure sample shows transition field but for highly doped sample, the plot shows curvature for both low and high field, i.e., there is no transition field. This nonlinearity of the plot is due to space charge built up in the sample. The value of β is calculated from the slope of LnJ versus E1/2 plot and compared with the theoretical value. The result shows the Poole-Frenkel mechanism of conduction is operative.
Sleep quality assessment by parameter optimization
Authors: Adil H , Koser A A , Qureshi M S , Gupta A
Published: November 2021

Sleep quality measurement is a complex process requires large number of parameters to monitor sleep and sleep cycles. The Gold Standard Polysomnography (PSG) parameters are considered as standard parameters for sleep quality measurement. In the PSG process, number of monitoring parameters are involved for that large number of sensors are used which makes this process complex, expensive and obtrusive. There is need to find optimize parameters which are directly involve in providing accurate information about sleep and reduce the process complexity. Our Parameter Optimization method is based on parameter reduction by finding key parameters and their inter dependent parameters. Sleep monitoring by these optimize parameter is different from both, clinical complex (PSG) used in hospitals and commercially available devices which work on dependent and dynamic parameter sensing. Optimized parameters obtained from PSG parameters are Electrocardiogram (ECG), Electrooculogram (EOG), Electroencephalography (EEG) and Cerebral blood flow (CBF). These key parameters show close correlation with sleep and hence reduce complexity in sleep monitoring by providing simultaneous measurement of appropriate signals for sleep analysis.
Classical Fuzzy Retrial Queue with Working Vacation using Hexagonal Fuzzy Numbers
Authors: Kannadasan G. , Padmavathi V.
Published: November 2021

Using fuzzy techniques “Classical Fuzzy Retrial Queue with Working Vacation(WV) using Hexagonal Fuzzy Numbers” is discussed in this paper. We acquire model in fuzzy environment as the average orbit length, Probability(Pr) that the server busy, and Pr(the server is in a WV period), the sojourn time of a customer in the queue. Finally numerical results are presented.
On the induced metric of a photon qubit for different points of action in Bloch sphere
Authors: Kumar Vineet
Published: November 2021

Travelling with harmonical actions about the referential line, the moment the photon qubit emits form the atom as a packet, not only embedded by the envelopes of quadratic nature overlap but also by the non-quadratic overlap effect as well in concurrent. This paper followed on by the subsistence of both ways of overlapping, focuses mainly on the induced metric of photon qubit, which concluded to be in 3-sphere by the local parameterization so called as Hopf coordinates. The protruded photon qubit in the induced Riemannian metric, for different points of the Bloch sphere, are in a manner that the stereographic projection of volume enveloped in 3-sphere determines the circular geometry in 2-sphere with the cross-sectional function in perpendicular to the continuum line of travel.
Green Synthesis of Silver Nanoparticles using Vitex Negundo Extracts and their Application in the Effluent Treatment of Cracker Industries
Authors: Kanthimathi G , Senthilkumar O , Sankar C , Prathibha B.S. , Senthil Kumar S.M.
Published: November 2021

Silver nanoparticles were prepared by green synthesis, which is an eco-friendly and inexpensive method. The synthesis was carried out using Vitex Negundo leaf extract at room temperature. The nanoparticles were encapsulated with Poly Vinyl Alcohol (PVA) matrix to avoid agglomeration. The formation of silver nanoparticles was confirmed by X-ray Diffraction (XRD). The morphology of the nanoparticles was investigated by scanning electron microscope (SEM). Energy Dispersive X-ray Spectrum (EDX) confirmed the presence of elemental Ag. Adsorption experiments confirmed the removal of toxic cadmium and chromium present in the industrial effluents as analysed by atomic absorption spectroscopy. The silver nanoparticles showed maximum adsorption efficiency for chromium compared to cadmium.
EPR study of Mn site substituted Pr based Doped Rare Earth Manganites
Authors: Uthra Dinesh , Sharma M P
Published: November 2021

In this paper, we present the investigations of Electron Paramagnetic Resonance (EPR) on Mn site substituted Pr based Doped rare Earth Manganites i.e. Pr0.60Ca0.40MnO3 and Pr0.60Ca0.40Mn0.85Zn0.15O3. Changes in physical properties as lattice parameters, average valence of Mn site was observable of those manganites. X-ray diffraction pattern shows that both Pr0.60Ca0.40MnO3 and Pr0.60Ca0.40Mn0.85Zn0.15O3 have single phase and without the other secondary or impurity phase and indexed supported the Pbnm space group. The value of x in Pr0.60Ca0.40Mn1-xZnxO3 increases, the average valence V was increased except for a fixed composition, i.e. x remains unchanged, the average valence V was decreased as we go from less valency to high valency (i.e., from divalent to trivalent and from trivalent to tetravalent. The EDXS analysis of those materials shows good homogeneity, but there are experimental errors in composition. It is seen from the SEM images that is formed in different shape grains. The average grain sizes of the samples are different for Pr0.60Ca0.40MnO3 and Pr0.06Ca0.40Mn0.85Zn0.15O3 The paramagnetic resonance spectra parameters (effective g-factor, peak-to-peak line width) of Pr0.60Ca0.40MnO3 and Pr0.60Ca0.40Mn0.85Zn0.15O3.have been used to study the paramagnetic spin correlations and spin dynamics. As for Pr0.60Ca0.40MnO3 the line width becomes wider because of the contribution of small polaron jumping within the PM mechanism. However, as for Pr0.60Ca0.40Mn0.85Zn0.15O3 the broadening of EPR line-width is understood with the spin-lattice relaxation mechanism, g value decreased from 1.99 to 1.79. Therefore, the Zn dopant not solely changes the parent spin correlation in the PM regime however additionally suppresses the development of orbital ordering.
Control over Vertical Orientation of Liquid Crystal using Spin Coated Silica Nanoparticles Layer on Conductive Substrates
Authors: Dogra Ankit Rai , Sharma Vandna , Khanra Partha , Kumar Pankaj
Published: November 2021

Recently, various techniques such as self-assembly, chemical vapour deposition and capillary method etc. are used for nanoparticles (NPs) deposition on the conductive substrates for the vertical alignment (VA) of liquid crystals (LCs). The initial VA of LCs in display devices have the potential impact on industry and various electro-optic devices applications. In the present work, vertical orientation of LCs was controlled on silica (SiO2) nanoparticles (NPs) layer deposited on indium tin oxide (ITO) glass substrates using spin coating method. The VA LC cell was also prepared for conventional polyimide coated ITO glass substrates. The morphological images showed the initial darker textures under crossed polarizers and conoscopic image with dark cross confirmed the VA of LC on SiO2 NPs coated substrates analogous to the conventional VA LC cell. Further, electro-optic results revealed the reduction in applied voltage and better contrast ratio for SiO2 NPs coated VA LC cell compared with polyimide coated VA LC cell.
Advances in low-cost and nontoxic materials based solar cell devices
Authors: Hegde S S , Ramesh K
Published: November 2021

Photovoltaics (PV) have become increasingly popular and reached as the third-largest renewable energy source. Thin-film solar cells made from earth-abundant, inexpensive and environmentally friendly materials are needed to replace the current PV technologies whose large-scale applications are limited by material and/or resource constraints. Near optimum direct optical bandgap of 1.3 eV, high absorption coefficient (>104 cm−1), less toxic, and abundant raw resources along with considerable scalability have made tin sulfide (SnS) as a strategic choice for next-generation PVs. In this review, limitations of leading commercial PV technologies and the status of a few alternate low-cost PV materials are outlined. Recent literature on crucial physical properties of SnS thin-films and the present status of SnS thin-film-based solar cells are discussed. Deficiency and adequacy of some of the key properties of SnS including carrier mobility (μ), minority carrier lifetime (τ), and absorption coefficient (α) are discussed in comparison of existing commercial solar cell materials. Future research trends on SnS based solar cells to enhance their conversion efficiencies towards the theoretical maximum of 24% from present ~5% and its prospectus as next-generation solar cell is also discussed.
Direct Sunlight driven photocatalytic degradation of hazardous organic dyes using TiO2-NiO nanocomposite p-n junction
Authors: Padmavathy N , Narasimha Murthy B , Hemakumar K H
Published: November 2021

TiO2 is stable and nontoxic, an effective, low cost, semiconductor photo catalyst to degrade most of the organic pollutants. Nevertheless, the practical application of TiO2 are limited due to two important reasons, while one of the reasons is rapid recombination of electron and hole pair and other one is larger band gap 3.2ev, which permits to absorb 3-4% of solar energy. To enhance photocatalytic activity, several TiO2-metal oxide composites have been used. Due to their electron hole separation ability p-n junction, type semiconductor has become more focused in the last few years. TiO2-NiO nanocomposite is one such catalyst; the presence of NiO facilitates the separation of the hole and the electron pair and encourages the interfacial charge transfer; which facilitates TiO2-NiO a good photocatalyst under direct sunlight. The objective of the study is to synthesise nanocomposite of different mole ratios of NiO and TiO2, to investigate the physicochemical properties such as XRD for phase and purity test, SEM –EDX for morphology and percentage elemental composition, UVDRS for band gap analysis. Photocatalytic activity of TiO2-NiO p-n junction nano structures experiments were carried out under direct sunlight in different systems; using aqueous solution of the dye with effect of pH, concentration of dye, catalyst loading and time on degradation of the organic dye were studied. With increasing the concentration of NiO in to TiO2-NiO composite increases the photocatalytic activity due to narrowing of the band gap attributed to interfacial charge transfer or higher hole mobility.
The effect of temperature and pressure on nitrogen adsorption in amorphous silica
Authors: Fatriansyah J. F. , Dhaneswara D. , Kuskendrianto F. R. , Abdurrahman M. H. , Yusuf M. B. , Abdillah F. A.
Published: November 2021

Nitrogen is an element that is widely found in nature can be used as a gas that is absorbed to help characterize materials, especially on the surface of the material. According to Brunauer – Emmet - Teller (BET) is a theory where nitrogen is used as a gas characterizing material because of its ability to high purity and can interact with solid elements and inert. BET can only produce quantitative data and does not show adsorption phenomena. Molecular dynamics simulation is conducted to observe the phenomena during nitrogen adsorption in amorphous silica, a porous material with a large surface area. In this study, the molecular dynamics simulations are arranged in a state of isotherm, where the temperature used is three variables: 77 K, 100 K, and 150 K in the variation of pressure used 1, 3, 5, 7, and 10 atm for each equilibrium. In molecular dynamics simulation to simulate the interaction between atoms based on Coulomb force is using Lennard-Jones Potential. Based on the simulation results obtain, it was found that at 77 K temperature had the optimal ability to adsorb nitrogen compared to 100 K and 150 K. The higher the pressure given in the system, it will increase the amount of nitrogen adsorbed.
Facile Green Synthesis and Characterisation of Gold Nanoparticles using Fenugreek Seeds and Honey
Authors: Lilly Anitha M , Riya J , Rinita J , Christma Eunice P , Nirmala Jothi N S
Published: November 2021

Gold nanoparticles are frequently employed in a range of biological applications because of its versatility in biosynthetic pathways and complexation, good biocompatibility and ease of detection. This study discusses the application of green chemistry in the production of gold nanoparticles using fenugreek and honey. It discusses nanoparticle characterisation in order to investigate structural, morphological, and optical characteristics. The mean crystalline size of fenugreek-mediated gold nanoparticles is 12.035nm nm, while honey-mediated gold nanoparticles are almost 42.2225 nm, according to XRD analysis. The absorption and fluorescence spectra correlated well with particle size variance in that the absorption and fluorescence peak positions were observed to move as particle size increased. The spherical shape of the particles was shown by SEM and TEM analysis, and the particle size was confirmed by XRD. EDAX analysis demonstrated the sample’s purity. On the surface of the sample, the presence of a functional group with distinctive peaks of gold NPs is shown by FT-IR and FT-Raman analysis, indicating a high potential for hyperthermia treatment, biomarkers, and cancer diagnostics.