bluuebunny/crossref_metadata_2025_split huggingface dataset:
Reducing “slice cross-talk” effect in metamaterial assisted fast spin-echo MRI
Authors: Brui E , Rapacchi S , Bendahan D , Andreychenko A 
Published: November 2021

Abstract
Imaging of subtle changes in hand structures is challenged by the limited image quality, especially at 1.5 T. Reduction of specific absorption rate in metamaterial-assisted 1.5 T MRI provides an opportunity to utilize efficient pulse sequences and to improve the quality of acquired images. This work is devoted to the assessment of potential improvements of slice selectivity and reducing a ”slice cross-talk” artifact, using fast spin-echo (FSE) pulse sequence together with a metamaterial-based coil. The slice selection in conventional T1-weighted FSE wrist imaging pulse sequences was modeled using a ”Bloch Equations Simulator”. Two types of pulses were compared: apodized SINC pulses (reference) common for clinical FSE, and optimized selective Shinnar–Le Roux (SLR) pulses constructed in the MATPULSE program. Regular and SLR-based FSE pulse sequences were tested in a phantom experiment with different gaps between slices to investigate the “slice cross-talk” artifact presence. Combining the utilization of the metamaterial-based coil with an SLR-based FSE provided 28 times lower energy deposition in a duty cycle, as compared to the regular FSE with a conventional transmit coil. When the slice gap was decreased from 100% to 0%, the “slice cross-talk” effect reduced the signal intensity by 16%-18% in the SLR-based FSE and by 23%-32% for the regular FSE. The use of SLR pulses together with the metamaterial-based coil allowed to reduce the ”slice cross-talk” effect in contiguous FSE, while still being within the safe SAR limits.
Conditions for a pure toroidal dipole source
Authors: Valero Adrià Canós 
Published: November 2021

Abstract
Recently, the physical significance of dynamic toroidal multipoles in the context of electrodynamics has been put under discussion. Indeed, the latter can be shown to arise simply from a Taylor series of the exact source (Cartesian) multipole moments. The split into elementary and toroidal parts was demonstrated to lead to an unphysical result were forbidden components of the momentum transform of the current could radiate into free space. In this contribution, we elaborate the conditions that a current distribution must necessarily satisfy to be considered a ‘pure’ toroidal dipole source. We demonstrate for the first time that symmetry prevents such current distribution to radiate as an elementary electric dipole moment, without leading to an unphysical result. Thus, while both elementary electric dipole and toroidal dipoles are indistinguishable outside the source, they display topologically distinct characteristics within the smallest spherical surface enclosing the source itself and have different physical origin. Based on our results, a pure ‘toroidal’ source can be designed. We believe the outcome of our investigations will help clarify further the formal meaning of the toroidal multipoles.
Spontaneous symmetry breaking in lasers with periodically modulated gain and refractive index
Authors: Dolinina D , Staliunas K , Yulin A 
Published: November 2021

Abstract
The dynamics of light in active optical systems with periodic complex potential is considered using coupled modes approach where the field is approximated by two counter propagating waves. It is demonstrated that shifting the position of the imaginary part of the potential (effective gain) with respect to the real part of the potential (variation of the refractive index) one can control the effective gain/losses seen by the upper and the power modes. This effect can be used to control the radiation from the laser. The effect of the Kerr nonlinearity is also considered and it is shown that this can result in spontaneous symmetry breaking leading to the formation of the hybrid nonlinear states.
Mesoporous perovskite solar cells with Al- and Zn-based metal-organic frameworks
Authors: Furasova A.D. , Hix G. , Makarov S.V. , Di Carlo A. 
Published: November 2021

Abstract
The improvement of lead halide perovskites solar cells (PSC) by hydrophobic metal-organic frameworks (MOF) is one of the promising tools for modern photovoltaic technology to achieve stable and efficient thin-film devices. To show the MOF applicability for PSC, we incorporate two types of MOF: NH2-MIL-53(Al) and basolite Z1200 in n-i-p mesoporous MAPbI3 based solar cells that can add 2.2% efficiency by increasing main photovoltaic parameters. The simplicity of the proposed MOF’s integration allows to use and adopt this approach to incorporate other frameworks for thin-film perovskite devices.
Excitation of a homogeneous dielectric sphere by a point electric dipole
Authors: Gaponenko Roman , Rasskazov Ilia , Moroz Alexander , Pidgayko Dmitry , Ladutenko Konstantin , Shcherbakov Alexey , Belov Pavel 
Published: November 2021

Abstract
Electrically small dielectric antennas are of great interest for modern technologies, since they can significantly reduce the physical size of electronic devices for processing and transmitting information. We investigate the influence of the resonance conditions of an electrically small dielectric spherical antenna with a high refractive index on its directivity and analyze the dependence of these resonances on the effectively excited modes of the dielectric sphere.
Tip-enhanced Stokes and anti-Stokes Raman scattering in defect-enriched carbon films
Authors: Gazizov Almaz R , Salakhov Myakzyum Kh , Kharintsev Sergey S 
Published: November 2021

Abstract
Anti-Stokes Raman scattering is one of the mechanisms that lie behind an optical refrigeration due to release of photons with greater energy than of incoming photons. To achieve a cooling regime the enhancement of anti-Stokes scattering is necessary, since spontaneous Stokes scattering dominates over anti-Stokes scattering under normal conditions. Here, we investigate the opportunity of enhancement of spontaneous anti-Stokes Raman scattering in defect-enriched carbon film by means of localized plasmon resonances. In our simulations, incoherence of Raman scattering results in excess of anti-Stokes intensity over Stokes one. However, when the field is localized within the phonon coherence volume (coherent regime), the anti-Stokes intensity is lower compared to Stokes one. The provided analysis shows that plasmon-enhanced anti-Stokes Raman scattering can be achieved in highly-defective carbon films. The results are beneficial for Raman-based temperature measurements on the nanoscale.
Arrays of electrically small antennas with SINIS detectors for SubTHz astronomy and atmosphere propagation research
Authors: Gunbina Aleksandra , Tarasov Mikhail , Lemzyakov Sergey , Vdovin Vyacheslav , Yakopov Grigory , Yusupov Renat , Chekushkin Artem , Nagirnaya Daria , Edelman Valerian 
Published: November 2021

Abstract
An overview of different arrays of electrically small annular antennas of 350 GHz band with integrated superconductor-insulator-normal metal-insulator-superconductor (SINIS) detectors is presented in this paper. Arrays developed for both astronomical observations on the BTA 6 m telescope and measurements there of test sources for investigation of atmospheric turbulence to estimate its influence on the data rate of subTHz telecommunication channels. It is shown both numerically and experimentally that to simulate the electrodynamics of such non-phased antenna arrays it is necessary to investigate the whole array, not a single cell with Floquet ports. The first results of studying of superconducting antennas are also presented in this paper.
Tunable GaAs metasurfaces for ultrafast image processing
Authors: Iushkov Viacheslav , Shorokhov Alexander , Fedyanin Andrey 
Published: November 2021

Abstract
The design and construction of optical semiconductor metasurfaces for various applications have become an important topic in the last decade. However, most metasurfaces are static; they are optimized for only one exact purpose and typically realize only one operation. In this work, we discuss the basic methods for creating dynamic metasurfaces giving special attention to ultrafast optical switching and provide numerical modeling of metasurfaces made of GaAs material realizing different amplitude-phase profiles under asymmetrical optical pumping. The metasurfaces are composed of semiconductor discs immersed in a fused silica medium. We demonstrate that based on Fourier transform and spatial filtering methods, these structures can be used for image processing and optical computing. Ultrafast switching is achieved by using an optical pump-probe scheme. The characteristic relaxation times between the pumped state and the relaxed state are on the order of several picoseconds.
Fabrication of metal-dielectric nanoparticles from a bi-layer gold-silicon film by femtosecond laser-induced dewetting
Authors: Koromyslov S. V. , Ageev E.I. , Ponkratova E. Yu. , Zuev D. A. 
Published: November 2021

Abstract
Today the world demand for the creation of highly efficient nanoscale white light sources is growing. It happens because energy-efficient information and communication systems are being developed, in which optical signals are replacing electrical signals. For the fabrication of such devices, creating efficient nanoscale white light sources with high efficiency is very acute. Such structures obtained by current methods have a common disadvantages: a small spectral width and low efficiency. Here we demonstrate the development of metal-dielectric structures exploiting the single-step and lithography-free laser-induced dewetting of bi-layer gold silicon films and study their broadband photoluminescence.
Superscattering for non-spherical objects
Authors: Krasikov S.D. , Odit M.A. , Dobrykh D. A. , Yusupov I.M. , Mikhailovskaya A. A. , Shakirova D. T. , Shcherbakov A. A. , Slobozhanyuk A. P. , Ginzburg P. , Filonov D. S. , Bogdanov A. A. 
Published: November 2021

Abstract
In this work we generalize the notion of superscattering and associate it with a symmetry group of a scattering object. Using the group theory approach we describe a way to spectrally overlap several eigenmodes of a resonator in order to achieve scattering enhancement. Importantly, this can be done by simple variation of geometric parameters of the system, implying that the symmetry is preserved. We also demonstarte that a scattering cross-section limit of a spherical object is not valid for the case of non-spherical geometries. As an example, we use finite-size ceramic cylinder and demonstrate that a dipolar scattering cross-section limit of a spherical object can be exceeded by more then 3 times. The obtained results may be promising for design of antennas and radio frequency identification systems.
Aldehyde Gas Detection using Nanostructured Zno-based Gas Sensor fabricated via Horizontal Vapor Phase Growth Technique
Authors: Olarve R S , Dela Torre H M , Foronda J R , Santos M G , Sajor N J , Lopez T B , Haygood K J , Santos G N 
Published: November 2021

AbstractDetection of aldehydes such as pentanal, hexanal, octanal, and nonanal are studied with the use of nanostructured zinc oxide (ZnO) as sensing element. ZnO nanowires synthesized at optimized growth parameters using horizontal vapor phase growth (HVPG) technique was used due to its unique properties in gas sensing applications. Scanning Electron Microscope (SEM) and Energy Dispersive X-Ray (EDX) were used to verify the growth of ZnO nanowire structures. Further characterization using Source Meter was used to measure its resistance and resistivity based on the I-V graph. The sensor substrate wire set-up is connected to the Source Meter for resistance measurements as exposed to the different gas concentration of aldehydes. Gas sensing measurements were done at the static headspace gas concentration of the identified aldehydes. The sensor response of nanostructured ZnO-based gas sensor towards different gas concentrations ranges from 5.84% to 38.08%. Response time varies but it was observed that octanal gas has the longest response while pentanal has the fastest response.
Fluorescence lifetime-based intracellular thermometry for photothermal therapy
Authors: Peltek Oleksii O , Ageev Eduard , Talianov Pavel M , Zyuzin Mikhail V 
Published: November 2021

Abstract
Photo-thermal therapy (PTT) is a rapidly developing approach for cancer treatment, that has greatly benefited from the tremendous advances in the synthesis of plasmonic nanoparticles (NPs), which can be used as light sensitive agents. This approach is based on the local induction of hyperthermia via light irradiation of plasmonic NPs in order to thermally kill cancerous cells. Such an approach ensures a high precision of treatment and the mechanism of action makes it as a valid alternative for treatment of malignant neoplasms with a multi-drug resistance. However, in order to minimize the adverse effects of PTT it is necessary to precisely measure and control the achieved temperatures at the tumor foci during light irradiation. Herein we report a novel technique to monitor intracellular temperatures during PTT based on temperature sensitive fluorescent dye, Rhodamine B. These findings may improve the quality of treatment and reduce unwanted adverse effects.
The algorithm for generating the training set for the problem of elastoplastic deformation of the metal rod
Authors: Seleznov Mykhailo 
Published: November 2021

Abstract
The paper proposes an algorithm for forming a small training set, which will provide a reasonable quality of a surrogate ML-model for the problem of elastoplastic deformation of a metal rod under the action of a longitudinal load pulse. This dynamic physical problem is computationally simple and convenient for testing various approaches, but at the same time it is physically quite complex, because it contains a significant range of effects. So, the methods tested on this problem can be further applied to other areas. This work demonstrates the possibility of a surrogate ML-model to provide a reasonable prediction quality for a dynamic physical problem with a small training set size.
Solution of the Kadomtsev-Petviashvili equation using an improved homotopy perturbation method
Authors: Sagar Zephania C F , Harisankar P C , Sil Tapas 
Published: November 2021

Abstract
An improved homotopy perturbation method (LH) applied to find approximate solution of KP equation. The results obtained ensure that LH is capable for solving the strongly higher dimension nonlinear partial differential equation such as KP equation. The approximated solution obtained by LH is compared with exact solution.
Analysis and Design of Reinforced Concrete Thin Cylindrical Shell
Authors: Barbhuiya Gulzar H. , Hasan Syed Danish , Al-Rashid Mohammed Harun 
Published: November 2021

Abstract
The need to come up with economical and efficient structural design led the engineers and researchers to focus more on shell structures. It is more durable, economical as it requires a minimum amount of material provides larger interior space and is aesthetic. A shell dominantly behaves as a membrane, though, at the edges, bending stresses get accumulated. Albeit several theories have been put forward, Schorer’s theory is eminent in the analysis of the long span thin cylindrical shells. This study is focused on the analysis of the stresses by utilizing the Fourier series and Schorer’s theory. Further, the shell is designed for the steel reinforcement as per the Concrete Reinforcing Steel Institute (CRSI) Design Handbook after calculating the final stress resultants and the detailing is also depicted.
Developing Sustainable Schools in the Shadow of Active Stratovolcano: A Study at Disaster-Prone Areas of Merapi Volcano
Authors: Nurhadi  , Ashari A , Sutrisnowati S A 
Published: November 2021

AbstractEducation is a right for people that must be given to children, even in an emergency of eruption disaster. To ensure the sustainable education during the crisis situations, ideas on how to develop a sustainable school system in the stratovolcano area which is prone to eruption disaster are needed. This research was conducted at schools located in the western side of Merapi Volcano, attempting to provide alternative information about the potential and role of schools in providing education during emergency situations of eruption disaster. Data in the study were collected through interviews, observations, remote sensing image interpretations, and documentations. Data were analysed by scoring and spatial analysis using geographic information systems. The results of the study are as follows. First, schools have the potential to provide education during the disaster emergency situations. School potential consists of physical infrastructure and human resource potential in the form of the role of the principal and teachers. Second, most of the level of school preparedness in facing disasters is still in the low category. This needs to be strengthened to ensure that the schools continue to function during the crisis period. Last, a division of roles in the sister school system is needed based on the location of the school toward the eruption centre. The schools in the safe zone act as a buffer for schools in vulnerable areas. Overall, schools have the potential to keep running the learning process during the crisis periods. This requires good management through the sister school system within the framework of sustainable school initiatives.
Assessment of Soil Erosion Hazard in Prambanan District Using RUSLE (Revised Universal Soil Loss Equation)
Authors: Mulya S. A , Khotimah N. 
Published: November 2021

Abstract
Prambanan District which located in Daerah Istimewa Yogyakarta Province has the potential for land degradation due to erosion processes. With the characteristics of annual rainfall more than 2000 mm / year, topography with a slope of more than 20% in upland areas, as well as the conversion of upland to dryland agriculture are factors that can trigger the erosion process more quickly. If the rate of erosion speed exceeds the ability of the soil to regenerate the soil body, its productivity will be disrupted and accelerate the formation of critical soil. Therefore, it is necessary to know the estimated rate of erosion, tolerable distribution of erosion, and the potential danger of erosion that occurs. The purpose of this study was to (1) predict the rate of erosion, (2) calculate the permissible erosion value, (3) identify the rate & index of erosion hazard. Data were collected using field surveys and soil sampling using stratified random sampling techniques with land units as the unit of analysis. The value of erosion was predicted using the Revised Universal Soil Loss Equation (RUSLE) method. The RUSLE method is described by the following equation, A=R*K*L*S*C*P, where; A as estimated averages annual loss of soil, R is the rainfall erosivity factor, K is the soil erodibility factor, LS is the slope length factor, C is the cover management factor, & P is the conservation practice factor. The results showed that the erosion value ranged from 0.39 - 268.55 tons/ha/year. Permissible erosion ranges from 8.4 – 15 tons/ha/year for Latosol and 27.4 ton/ha/year for Regosol. The Rate of Erosion Hazard is dominated by moderate erosion, covering an area of 1330.7 ha or 31.8% of the total area. The Erosion Hazard Index is dominated by the low class (<1.0) which is covered over 2703.1 ha or 64.61% of the total area.
The Relationship Between Socioeconomic Status and Household Water Requirement in Muara Angke Inundation Area, Jakarta
Authors: Setiawan Cahyadi , Muzani  , Warnadi  
Published: November 2021

Abstract
Jakarta has approximately 40 percent of the area below sea level at high tide, one of which is located at Muara Angke. The area of Muara Angke experiences inundation and has groundwater contaminated by urban community activities and saltwater intrusion. As for the purpose in this research is two calculate the relationship between socioeconomic status and household water requirement. This research was conducted for 5 months from March to July during the Covid-19 pandemic. Respondents were 40 households which were determined by simple random sampling. Multiple regression is used to determine the relationship between the independent variables and dependent variable. The results showed that there was a strong relationship between socioeconomic status and household water requirement because the value was above 0.8. The value R Square obtained is 78.9% which can be interpreted that the independent variables contribute 78.9% to the dependent variable and remaining 21.1% is influenced by other factors. The most influential variable is the number of household members.
Disaster Mitigation of Dry and Clean Water Crisis in Dana Sub-District Watopute District Muna Regency
Authors: Amaluddin La Ode , Musyawarah Rahma , Harudu La , Nursalam La Ode , Sufiandi Laode Utusafar 
Published: November 2021

Abstract
In the Southeast Sulawesi region, the area most frequently experiencing drought and clean water crises is Dana Sub-District, Watopute District, Muna Regency. This disaster was caused by physical and social factors. This study aims to describe the mitigation efforts of drought and clean water crisis in the Dana Sub-District, Watopute District. This research uses descriptive qualitative research methods. The population in this study were all the heads of families in Dana Sub-District, totaling 604 people. The sample in this study was selected using simple random sampling technique where the sample was randomly selected as much as 10% of the total population, so the sample in this study was 60 people. The results showed that the drought and water crisis in the Dana Sub-District, Watopute District occurred due to climate change and geomorphological conditions of the area as well as the lack of cooperation in the community in paying water bills. The peak of drought and clean water crisis in this region often occurs from July to November. To overcome this, various efforts have been made by the community, for example taking water from rivers and springs, buying clean water, and collecting water in storage tanks. Furthermore, the local government has also issued several policies, namely the development of the District Capital City Drinking Water Supply System and procurement of water pumps from springs, but according to the local community these government policies have not been effective. Furthermore, water dropping is also not maximally done because the community is less cooperative in paying water bills.
Disaster Mitigation Snake and Ladder Game to Improve Earthquake Disaster Preparedness (A Case Study: Yogyakarta 5 Senior High School)
Authors: Ersani E , Mukminan  
Published: November 2021

Abstract
Tectonic earthquakes are natural disasters that are difficult to predict when they occurs, therefore preparedness is needed to deal with them. This study aims to determine the improvement in student preparedness for tectonic earthquakes using Guncang Bumi snake and ladder learning media. This research is research and development using the ADDIE model (analysis, design, development, implementation, evaluation). The research subjects were 63 students of class XI of Science. Data collection techniques used were test questions. The data analysis technique used is descriptive analysis and independent t-test analysis. Based on the independent t-test analysis obtained sig <0,05, it can be concluded that there is a difference in preparedness between the experimental class and the control class. Based on the calculation of the improvement in preparedness score, the percentage of improvement in disaster preparedness for the experimental class is 67,65%. The improvement percentage in preparedness for the control class was 32,35%. Both classes have improved but the improvement over much experimental class. Therefore it can be concluded that the use of the Guncang Bumi snake and ladder can improve preparedness for a tectonic earthquake disaster.