bluuebunny/crossref_metadata_2025_split huggingface dataset:
Giant tunability of microwave responses for current-driven skyrmions in a tapered nanostructure with notches
Authors: P J Krishnanjana , Paikaray Bibekananda , Murapaka Chandrasekhar , Haldar Arabinda 
Published: April 2023

Abstract
The investigation of the gigahertz dynamics of a skyrmion—a topologically protected chiral spin texture, offers several applications in high-frequency magnonic devices. In this work, we have investigated the motion and microwave resonant dynamics of skyrmions in an engineered nanostructure using micromagnetic simulations. The structure is a tapered ferromagnetic/heavy metal bilayer with notches to stabilize the skyrmion for dynamic studies. The skyrmion is moved along the nanostructure via current-induced spin–orbit torques. Multiple stable skyrmion states were demonstrated in the structure, where a remarkable tunability of 6 GHz is observed between the initial and the final state. This large shift in the resonant frequency has been attributed to the variation in the size of the skyrmion at various locations in the engineered nanostructure. The dependency of the skyrmion velocity and their microwave responses on the DzyalosnDzyaloshinskii–Moriya interaction strength and the perpendicular magnetic anisotropy is described. The calculation of the skyrmion Hall angle shed light on the motion and stability of the skyrmion in the structure.
Optimization of uniformity in plasma ashing process using genetic programming
Authors: Moriya Tsuyoshi , Suzuki Yusuke , Yonemichi Hitoshi , Moki Hironori 
Published: April 2023

Abstract
This study is geared toward the optimization of plasma processes through machine learning (ML) based on a regression algorithm. The ML approach has also enabled us to tune the parameters of plasma distribution. As the contribution rate for parameters can be calculated, ML offers the possibility of principal component analysis for a new process window.
A novel hand-eye calibration method using double-layer optimization and outlier sample screening for monocular vision robots
Authors: Chen Lin , Han Ze , Zhong Guowei , Zhang Lei , Chen Yao , Pan Haihong 
Published: April 2023

Abstract
In monocular vision robot systems, the hand-eye calibration approach is crucial for ensuring operational accuracy. A double-layer (Levenberg–Marquardt ([LM] method) optimization (DLMO) method with outlier points screening is proposed to reduce the influence of random errors in robot vision systems and improve the calibration accuracy of the robot hand-eye matrix. First, the equation of the hand-eye matrix is established, and the initial value of the hand-eye matrix is solved by the linear least square method. Second, the Euler angle transformation is applied to the rotation matrix part to ensure its orthogonality. Next, an optimization model of the hand-eye matrix is constructed, and the traditional LM optimization method is used to optimize the initial hand-eye matrix for the first time. Finally, the optimization model of the hand-eye matrix is modified, and the LM optimization method with the outlier sample points screening is applied to optimize the hand-eye matrix for the second time. Hand-eye calibration tests are conducted on an industrial robot equipped with a monocular vision system using the proposed method. Experimental results demonstrate that the average position error of the calibration results obtained by the proposed DLMO method is 0.22 mm, which is superior to the traditional hand-eye calibration method and meets the working requirements of the vision robot in the industrial field.
Unsaturated polyester resin/polymethylmethacrylate waveguide-based refractive index sensor with dual-wavelength temperature compensation
Authors: Yulianti Ian , Marwoto Putut , Astuti Budi , Made D P Ngurah , Fianti  , Paradita Dhea , Darsono Teguh , Ngajikin Nor Hafizah , Yaacob Maslina , Cholan Noran Azizan 
Published: April 2023

Abstract
This paper demonstrates an optical waveguide based- refractive index (RI) sensor using the temperature compensation method. The optical waveguide was formed using a polymethylmethacrylate sheet as the cladding material and unsaturated polyester resin as the core material. The sensor design consists of two input waveguide branches, a sensing area and an output branch. Two light emitting diodes with wavelength of 530 nm and 660 nm were used as light sources. In this work, temperature compensation was done by dual-wavelength technique in which RI and temperature sensitivities were measured at two different wavelengths at 530 nm and 660 nm. Based on the RI and temperature sensitivities, temperature compensation was implemented. Experimental findings indicated that the average relative error of the uncompensated measurement using the light source of 530 nm and 660 nm were 0.4372% and 0.2749%, respectively. Meanwhile, the average error of the temperature compensation method was 0.0344%. Hence, the temperature compensation method provides measurement error up to 92% lower compared to the uncompensated method. As such, the proposed dual-wavelength compensation method could effectively improve the RI measurement accuracy.
Hot atomic vapors for nonlinear and quantum optics
Authors: Glorieux Quentin , Aladjidi Tangui , Lett Paul D , Kaiser Robin 
Published: April 2023

Abstract
Nonlinear optics has been a very dynamic field of research with spectacular phenomena discovered mainly after the invention of lasers. The combination of high intensity fields with resonant systems has further enhanced the nonlinearity with specific additional effects related to the resonances. In this paper we review a limited range of these effects which has been studied in the past decades using close-to-room-temperature atomic vapors as the nonlinear resonant medium. In particular we describe four-wave mixing and generation of nonclassical light in atomic vapors. One-and two-mode squeezing as well as photon correlations are discussed. Furthermore, we present some applications for optical and quantum memories based on hot atomic vapors. Finally, we present results on the recently developed field of quantum fluids of light using hot atomic vapors.
Influence of ZnO/TiO2 nanocomposite on optical and structural properties of OC1C10–PPV–DMP thin film
Authors: Al-Asbahi Bandar Ali , Alanezi Arwa Alhamedi , Asemi Nassar N , Qaid Saif M H , AlSalhi Mohamed S 
Published: April 2023

Abstract
The photophysical properties of poly[2-methoxy-5-(3,7-dimethyl-octyloxy)-1,4-phenylenevinylene]—End capped with dimethylphenyl (DMP), OC1C10–PPV–DMP, were modified by incorporation various contents of the nanocomposites of both anatase TiO2 and wurtzite ZnO (ZTNCs). The solution blending method was employed to prepare the nanocomposite hybrids of OC1C10–PPV–DMP with ZTNCs before depositing them onto glass substrates. The optical parameters of the hybrid nanocomposite thin films were extracted from both absorption and photoluminescence spectra. XRD, FTIR, and FE-SEM revealed the good incorporation of ZTNC into the polymer matrix with the formation of a nanocomposite structure. By increasing the content of ZTNCs in the polymer matrix, the optical parameters of OC1C10–PPV–DMP such as energy band gap, energy tail, steepness parameter, and CIE chromatic coordinates were tuned. The incorporation of ZTNCs resulted in broadened and improved absorption and emission peaks of the polymer with a systematic shift for its corresponding maximum peaks. These unique findings are crucial for improving the performance of optoelectronic devices based on OC1C10–PPV–DMP/ZTNCs.
Structural and magnetic conduct in Sm and Al substituted Ba0.9Sm0.1Fe10Al2O19M-type hexaferrites at different sintering temperatures
Authors: Alshammari Basmah H , Ghori Ubaid-ur-Rehman , Ranjha Qasim Ali , Ahmad Sohail , Abbas Waseem , Asif Sana Ullah , Ahmed Fahim , Ibrahim Fatma A , Hamdy Mohamed S , Eldin Sayed M 
Published: April 2023

AbstractThe hexagonal ferrites with composition Ba0.9Sm0.1Fe10Al2O19has been prepared by using conventional solid state reaction method. As prepared samples were then sintered at different sintering temperatures to analyze the effects on magnetic and structural properties of Barium hexa ferrites. These samples were then characterized by using various techniques. For structural characterization x-ray diffraction technique was used. XRD results confirmed phase pure hexagonal structure. No impurity peaks were observed. For Morphological analysis of all the samples Scanning Electron Microscopy (SEM) was utilized. SEM micrographs suggested the formation of hexaferrites material with homogenous distribution of particles. Magnetic properties were measured by permanent magnetic measuring system. Magnetic conduction of material was tested under varying magnetic field of ± 30 KOe at room temperature. The saturation magnetization value was observed 48.55 emu g−1and coercivity 5.01KOe for the sample sintered at 1220 °C. As the sintering temperature rises, the values for magnetic saturation decreases to 46.24 emu g−1and coercivity increases up to 5.26 KOe at 1270 °C.
Estimating the performance of solar cells with luminescent down-shifting layers
Authors: Bernal-Correa Roberto , Morales-Acevedo Arturo , Montes-Monsalve Jorge 
Published: April 2023

Abstract
Technological developments for improving the performance of conventional solar cells have become a topic of great interest in recent years. For instance, solar concentrators, new anti-reflective coatings, and Luminescent Down-Shifting Layers (LDS), among different techniques have been used in the past. The latter is an attractive option because an LDS layer has the property of increasing the photon flux density in the appropriate wavelength range on top of a cell device with the possibility of increasing the photo-current density. Then, in this work we focus on the development of a theoretical model to determine the cell´s illumination current density, considering the modified solar spectrum, and taking in account the modified spectral reflectance and transmittance at the upper layers when an optimized LDS layer is inserted on a solar cell. The correct selection of such a layer for a specific solar cell would increase its performance due to the enhanced photon density in the absorption region for which the solar cell has the highest quantum efficiency. As an example, it is shown that a Lu3Al5O12:Ce3+ layer on top of a CdTe solar cell might cause an efficiency increase of around 21%.
Robust scheme for high-fidelity generation of mesoscopic entangled cat state
Authors: Zhou Yuan , Li Ying , Wang Jing-Wei , Wang Xing-Chen , Xie Peng , Lü Dong , Li Xin-Ke , Ren Hong-Tao 
Published: April 2023

Abstract
We here study a hybrid quantum system of one solid-state electronic spin coupled to a mechanical resonator (MR) using the crystal strain, with the purpose of engineering the mesoscopic spin-phonon entangled cat state. The feature of this work to be mentioned is that it proposes a different and feasible method to achieve the entanglement, especially with the higher fidelity. This scheme mainly contains two steps, namely the coherent population trapping (CPT) initialization and large-detuning evolution (LDE). By taking all of the adverse decoherence factors into our considerations, the numerical simulations indicate that its fidelity can reach more than 0.995 (or 0.999) when the spin-mechanical coupling strength is 10 (or 100) times larger than spin dephasing and mechanical resonator dissipation rate, respectively. Because of the cooperation of CPT and LDE, this proposal also exhibits a considerable robustness for engineering the entangled cat state, and which may be considered as a general attempt that may be suitable for different systems.
Application of circuit analog optimization method in fast optimization of dynamically tunable terahertz metamaterial sensor
Authors: Zhang Dapeng , Li Zhi , Jia Bowen , Tang Yuan , Yang Zhen 
Published: April 2023

Abstract
The simulation design of terahertz metamaterial sensors with dynamically tunable parameters typically relies on manual parameter tuning for structural optimization. However, this method is often prone to subjective factors and suffer from issues such as frequent reconstruction of simulations, high computational costs, long processing times, and suboptimal optimization results. In this paper, we propose a circuit analog optimization method (CAOM), which constructs equivalent RLC parameters to achieve a highly fitted terahertz transmission spectrum frequency obtained from CST full-wave numerical simulation. To validate the effectiveness of the proposed model, we use a typical periodic structure unit, a double-nested split ring resonator (DSRR) terahertz metamaterial sensor, as the simulation object. Both the inner and outer open resonant rings of the sensor are made of graphene, as a result, the opening size and Fermi level of the resonant rings are dynamically tunable. The results of the validation demonstrate that the adjustments of the sensor parameters can be effectively mapped by the changes of the equivalent RLC parameters. And the proposed equivalent circuit model has parameter substitutability in the simulation modeling of split ring resonator type sensors. The proposed equivalent circuit model exhibits parameter substitution in the simulation modeling of open resonant ring-type sensors. To achieve optimal sensing performance for the electromagnetically induced transparency (EIT)-like resonant peak (with a resonant frequency of f
2) of the sensor under constrained conditions, we introduce the genetic algorithm (GA) into the equivalent circuit model to enable fast optimization of the opening sizes of the inner and outer resonant rings, as well as the Fermi level of the sensor. Moreover, the accuracy of the optimization results is verified by CST simulations. Finally, the optimization results show that the optimal FOM of the EIT-like resonant peak within the given parameter range is 0.712, which is greater than that of any randomly combined parameters. This numerical result demonstrates the effectiveness of the proposed CAOM. The proposed model and optimization method have potentials to inspire further research in device design, performance optimization, theoretical modeling, etc.
An equivalent circuit for magnetoelectric composites operating in a longitudinal mode resonance: BAW-actuated mechanical antenna
Authors: Dong Hongmei , Guo Huihui , Li Junru , Li Jianbo , Gan Xiuxiu 
Published: April 2023

Abstract
It brings new design perspectives to study mechanical antenna in the view of circuit rather than the electromagnetic field. In this paper, an equivalent circuit of bulk acoustic wave (BAW) antenna is constructed by using constitutive relation of magnetoelectric composites and Newton’s governing equation. Based on this circuit, series and parallel resonant frequencies of two phases for BAW antenna are simulated in advanced design system (ADS) and magnetoelectric coupling coefficient is calculated. The results show that the electromechanical coupling coefficient is about 6%, the magnetomechanical coupling coefficient is about 86%, and the magnetoelectric coupling coefficient is about 5.2% under the existing material system (AlN and FeGaB). The magnetoelectric voltage gain is derived based on Kirchhoff’s Current Law, which contributes to studying the influence of the two phases thickness ratio on the performance of BAW antenna. The results show that BAW antenna has the optimal energy coupling and conversion when the thickness ratio of the two phases is 1:1. The input and the output impedances of BAW antenna are calculated by T-parameter matrix, which are perfectly matched with the results in ADS simulation. Relevant experiments have been carried out by preparing the magnetoelectric antenna based on PZT and Terfenol-D materials to verify the universality of the model.
Morphological analysis of the polarized synchrotron emission with WMAP and Planck
Authors: Martire F.A. , Banday A.J. , Martínez-González E. , Barreiro R.B. 
Published: April 2023

Abstract
The bright polarized synchrotron emission, away from the Galactic plane, originates mostly from filamentary structures. We implement a filament finder algorithm which allows the detection of bright elongated structures in polarized intensity maps. We analyse the sky at 23 and 30 GHz as observed respectively by WMAP and Planck. We identify 19 filaments, 13 of which have been previously observed. For each filament, we study the polarization fraction, finding values typically larger than for the areas outside the filaments, excluding the Galactic plane, and a fraction of about 30% is reached in two filaments. We study the polarization spectral indices of the filaments, and find a spectral index consistent with the values found in previous analysis (about -3.1) for more diffuse regions. Decomposing the polarization signals into the E and B families, we find that most of the filaments are detected in PE
, but not in PB
. We then focus on understanding the statistical properties of the diffuse regions of the synchrotron emission at 23 GHz. Using Minkowski functionals and tensors, we analyse the non-Gaussianity and statistical isotropy of the polarized intensity maps. For a sky coverage corresponding to 80% of the fainter emission, and on scales smaller than 6 degrees (ℓ > 30), the deviations from Gaussianity and isotropy are significantly higher than 3σ. The level of deviation decreases for smaller scales, however, it remains significantly high for the lowest analised scale (∼ 1.5°). When 60% sky coverage is analysed, we find that the deviations never exceed 3σ. Finally, we present a simple data-driven model to generate non-Gaussian and anisotropic simulations of the synchrotron polarized emission. The simulations are fitted in order to match the spectral and statistical properties of the faintest 80% sky coverage of the data maps.
Quartz-based Passive Signal Sorter as Radiofrequency Receiver
Authors: Medina I , Martínez D , Suárez D E , Pineda O 
Published: April 2023

Abstract
In this research, we developed a quartz-based passive signal sorter as a radiofrequency receiver, which wirelessly generates voltage from frequency, particularly NFC (13.56MHz), with high efficiency and energy use. Through the electromagnetic field, the passive signal sorter takes advantage of the environment’s frequency to make the quartz oscillate and generate voltage as a result of the piezoelectric effect, along with diodes and capacitors to rectify the electric signal. Among its possible uses, it can be applied to a CUBESAT, since it currently implements solar supply through panels and stores this energy in batteries, because the normal environment limits several types of supply. The CUBESAT spends great periods of time without using direct sunlight, and the farther it is from it, the longer it takes to fill the batteries, and in some particular cases, to reduce the subsystems’ charge. It is suggested that the quartz-based signal sorter works as a reserve source that supplies these batteries by getting energy from the Earth’s electromagnetic fields, preventing as much as possible the lack of energy. The circuit’s development leads to a supply proposal for a CUBESAT system by proving it is economically and volumetrically viable and that it is attractive not only because of the aforementioned benefits but also for being highly efficient and friendly to the environment. It is a great opportunity to implement it in space, industrial, corporate, and household sectors.
Cost Model for CubeSat Projects in Mexico
Authors: Jiménez Navarro E N , Solís Santomé A , Padilla Pérez D A , Domínguez Pacheco F A , Sosa Paz C J , Silva Sánchez C 
Published: April 2023

Abstract
This work focused on designing a cost estimation model in the area of space engineering for the development of nanosatellite projects in Mexico. See employed the use of methodologies such as Hall and Jenkins, software engineering cost estimating methodology, as well as project management methodology. Similarly, the COSYSMO methodology and parametric cost methodology were incorporated to guide this research towards the space sector. The estimation results are based on satellite engineering equations and forecasts of the inflation factor. Finally, a graphical user interface named SACANI was obtained. Allowing the estimating a nanosatellite project by ”integration of components” or by ”research and development”. The first asks the user for the components by subsystem through drop-down lists, giving a breakdown of the estimated costs for the CubeSat, development phases and ground station, according to the data provided by the interested party. The second model is more robust because it requests the type of project, the category, the amount of CubeSat required, the year to estimate the cost, the mass of the payload, among other data. Similarly, both models yield a previous result of the estimate made according to the data entered by the project estimator.
Augmented Reality for Interaction with a CubeSat nanosatellite (ARICS)
Authors: Hernandez Jhonatan Fernando Eulopa , Hernández Emmanuel Cervantes , Perez Diego Alfredo Padilla 
Published: April 2023

Abstract
The development of national aerospace technology has aroused interest in different sectors, so there is a long road to transformation where our country must develop the necessary aerospace infrastructure for said technology. The educational sector has been interested in aerospace technology but the use of this type of technology is expensive. That is why, with the support of ICTs, we think about how to solve this problem and this is where augmented reality (AR) comes in, given that today most young people have a cell phone capable of displaying functions of AR through a mobile application. Currently AR in the aerospace industry is used to support the assembly of complex systems such as aircraft or satellites, and perform simulations of the operation of these systems. That is why this project proposes the use of augmented reality so that anyone has access to interaction with a CubeSat-type nanosatellite from their mobile devices.
OPTIma: a tracking solution for proton computed tomography in high proton flux environments
Authors: Winter A. , Aitkenhead A. , Allinson N. , Allport P. , Cotterill J. , Esposito M. , Green S. , Kirkby K.J. , MacKay R.I. , Manger S. , Merchant M.J. , Price T. , Pyatt S. , Taylor M.J. , Waltham C. 
Published: April 2023

Abstract
Currently there is a large discrepancy between the currents
that are used for treatments in proton beam therapy facilities and
the ultra low beam currents required for many proton CT imaging
systems. Here we provide details of the OPTIma silicon strip based
tracking system, which has been designed for performing proton CT
imaging in conditions closer to the high proton flux environments of
modern spot scanning treatment facilities. Details on the physical
design, sensor testing, modelling, and track reconstruction are
provided along with Monte-Carlo simulation studies of the expected
performance for proton beam currents of up to 50 pA at the nozzle
when using a σ= ∼10 mm spot scanning cyclotron
system. Using a detailed simulation of the proposed OPTIma system, a
discrepancy of less than 1% on the Relative Stopping Power is found
for various tissues when embedded within a 150 mm diameter Perspex
sphere. It is found that by accepting up to 7 protons per bunch it
is possible to operate at cyclotron beam currents up to 5 times
higher than would be possible with a single proton based readout,
significantly reducing the total beam time required to produce an
image, while also reducing the discrepancy between the beam currents
required for treatment and those used for proton CT.