bluuebunny/crossref_metadata_2025_split huggingface dataset:
High resolution polymer/air double-cavity Fabry–Perot fiber temperature sensor based on exposed core microstructured fiber
Authors: Tong Zhifeng , Wang Lina , Duan Tingting , Geng Youfu , Li Xuejin , Yi Duo , Hong Xueming 
Published: June 2022

Abstract
This study proposes a high-resolution optical fiber Fabry–Perot (FP) temperature sensor and it is based on an exposed-core microstructured optical fiber (ECF) coated by a ultraviolet curing polymer adhesive. Then, a small piece of multimode fiber (MMF) with large core diameter is spliced in front of ECF to expand the input light beam, and the parallel polymer/air double-cavity FP in such single-mode fiber (SMF)-MMF-ECF-SMF structure is constructed. Additionally, by employing a mobilized demodulation module, the interference signal is analyzed by phase demodulation method. The experimental results show that the temperature sensitivity of the sensor is 30.8 ℃−1 and the resolution is up to 1.6 × 10−4 ℃ in a range of 20 ℃–50 ℃, which can achieve high resolution temperature measurement. Furthermore, to alleviate the wavelength uncertainty of the demodulation device, a double-cavity self-reference differential phase modulation method is explored in the proposed parallel double-cavity FP. It shows that the stability could be improved to five times when system temperature is unstable, which offers an alternative method to further improve the temperature sensing resolution.
Influence of interface states on built-in electric field and diamagnetic-Landau energy shifts in asymmetric modulation-doped InGaAs/GaAs QWs
Authors: Vashisht Geetanjali , Porwal S , Haldar S , Dixit V K 
Published: June 2022

Abstract
The impact of interface defect states on the recombination and transport properties of charges in asymmetric modulation-doped InGaAs/GaAs quantum wells (QWs) is investigated. Three sets of high-mobility InGaAs QW structures are systematically designed and grown by the metal-organic vapor phase epitaxy technique to probe the effect of carrier localization on the electro-optical processes. In these structures, a built-in electric field drifts electrons and holes towards the opposite hetero-junctions of the QW, where their capture/recapture processes are assessed by temperature-dependent photoreflectance, photoluminescence, and photoconductivity measurements. The strength of the electric field in the structures is estimated from the Franz Keldysh oscillations observed in the photoreflectance spectra. The effects of the charge carrier localization at the interfaces lead to a reduction of the net electric field at a low temperature. Given this, the magnetic field is used to re-distribute the charge carriers and help in suppressing the effect of interface defect states, which results in a simultaneous increase in luminescence and photoconductivity signals. The in-plane confinement of charge carriers in QW by the applied magnetic field is therefore used to compensate the localization effects caused due to the built-in electric field. Subsequently, it is proposed that under the presence of large interface defect states, a magnetic field-driven diamagnetic-Landau shift can be used to estimate the fundamental parameters of charge carriers from the magneto-photoconductivity spectra instead of magneto-photoluminescence spectra. The present investigation would be beneficial for the development of high mobility optoelectronic and spin photonic devices in the field of nano-technology.
Is icosahedral short-range order presented in supercooled transition metals?
Authors: Khusnutdinoff R M , Khairullina R R , Suslov A A , Lad’yanov V I , Mokshin A V 
Published: June 2022

Abstract
Supercooled transition metals are characterized by the absence of long-range order and the presence of a specific short-range order in the arrangement of atoms. So, the presence of shoulders and broadenings at the second maximum in the experimentally measured quantity—in the static structure factor S(k)—is usually interpreted as a manifestation of the icosahedral (ideal or distorted) short-range order (ISRO—Icosahedral Short-Range Order). Icosahedral short-range order is a structure with fivefold symmetry in the arrangement of atoms, which can lead to the possibility of achieving deep supercooling. In this work, we study the local structural features of equilibrium and supercooled nickel melts under various cooling protocols (

γ
∈

10

10

,

10

14

K s−1) in order to clarify the mechanism of formation of the icosahedral short-range order in pure transition metals. Comprehensive studies of the properties of nickel melts were carried out using experiments on x-ray diffraction, large-scale molecular dynamics (MD) simulations with subsequent structural and cluster analysis. A good agreement was found between the results of x-ray diffraction data and the MD simulations results for an equilibrium nickel melt. It was found that the nickel melt is characterized by a short-range order, formed by fragments of icosahedra and distorted icosahedral clusters. It was revealed that the ‘liquid-crystal’ phase transition in nickel is accompanied by the transformation of distorted icosahedral clusters into clusters with the fcc/hcp-symmetry. It is shown that, in contrast to the Voronoi tessellation method, the cluster analysis method based on the (

q
4

,

q
6

) rotational invariants does not allow sufficiently correct identification of the distorted icosahedral short-range order in metal melts.
Direct-write formation of integrated bottom contacts to laser-induced graphene-like carbon
Authors: Murray Richard , O’Neill Orla , Vaughan Eoghan , Iacopino Daniela , Blake Alan , Lyons Colin , O’Connell Dan , O’Brien Joe , Quinn Aidan J 
Published: June 2022

Abstract
We report a simple, scalable two-step method for direct-write laser fabrication of 3D, porous graphene-like carbon electrodes from polyimide films with integrated contact plugs to underlying metal layers (Au or Ni). Irradiation at high average CO2 laser power (30 W) and low scan speed (∼18 mm s)−1 leads to formation of ‘keyhole’ contact plugs through local ablation of polyimide (initial thickness 17 μm) and graphitization of the plug perimeter wall. Top-surface laser-induced graphene (LIG) electrodes are then formed and connected to the plug by raster patterning at lower laser power (3.7 W) and higher scan speed (200 mm s)−1. Sheet resistance data (71 ± 15 Ω sq.)−1 indicates formation of high-quality surface LIG, consistent with Raman data which yield sharp first- and second-order peaks. We have also demonstrated that high-quality LIG requires a minimum initial polyimide thickness. Capacitance data measured between surface LIG electrodes and the buried metal film indicate a polyimide layer of thickness ∼7 μm remaining following laser processing. By contrast, laser graphitization of polyimide of initial thickness ∼8 μm yielded devices with large sheet resistance (>1 kΩ sq.)−1. Raman data also indicated significant disorder. Plug contact resistance values were calculated from analysis of transfer line measurement data for single- and multi-plug test structures. Contacts to buried nickel layers yielded lower plug resistances (1-plug: 158 ± 7 Ω , 4-plug: 31 ± 14 Ω) compared to contacts to buried gold (1-plug: 346 ± 37 Ω , 4-plug: 52 ± 3 Ω). Further reductions are expected for multi-plug structures with increased areal density. Proof-of-concept mm-scale LIG electrochemical devices with local contact plugs yielded rapid electron transfer kinetics (rate constant k
0 ∼ 0.017 cm s−1), comparable to values measured for exposed Au films (k
0 ∼0.023 cm s)−1. Our results highlight the potential for integration of LIG-based sensor electrodes with semiconductor or roll-to-roll manufacturing.
Maximal mixed parabolic–hyperbolic regularity for the full equations of multicomponent fluid dynamics
Authors: Druet Pierre-Etienne 
Published: June 2022

AbstractWe consider a Navier–Stokes–Fick–Onsager–Fourier system of PDEs describing mass, energy and momentum balance in a Newtonian fluid with composite molecular structure. For the resulting parabolic–hyperbolic system, we introduce the notion of optimal regularity of mixed type, and we prove the short-time existence of strong solutions for a typical initial boundary-value-problem. By means of a partial maximum principle, we moreover show that such a solution cannot degenerate in finite time due to blow-up or vanishing of the temperature or the partial mass densities. This second result is however only valid under certain growth conditions on the phenomenological coefficients. In order to obtain some illustration of the theory, we set up a special constitutive model for volume-additive mixtures.
Global boundedness of solutions to a parabolic–parabolic chemotaxis system with local sensing in higher dimensions
Authors: Fujie Kentaro , Senba Takasi 
Published: June 2022

Abstract
This paper deals with classical solutions to the parabolic–parabolic system

u

t

=
Δ

(

γ

(

v

)

u

)

i
n

Ω
×

(

0
,
∞

)

,

v

t

=
Δ
v
−
v
+
u

i
n

Ω
×

(

0
,
∞

)

,

∂
u

∂
ν

=

∂
v

∂
ν

=
0

o
n

∂
Ω
×

(

0
,
∞

)

,

u

(

⋅
,
0

)

=

u

0

,

v

(

⋅
,
0

)

=

v

0

i
n

Ω
,

where Ω is a smooth bounded domain in R

n
(n ⩾ 3), γ(v) = v
−k
(k > 0) and the initial data (u
0, v
0) is positive and regular. This system has striking features similar to those of the logarithmic Keller–Segel system. It is established that classical solutions of the system exist globally in time and remain uniformly bounded in time if k ∈ (0, n/(n − 2)), independently of the magnitude of mass. This constant n/(n − 2) is conjectured as the optimal range guaranteeing global existence and boundedness in the corresponding logarithmic Keller–Segel system. In the course of our analysis we introduce an auxiliary function and derive an evolution equation that it satisfies. Using refined comparison estimates we control the behavior of the nonlinear term in the equation for the auxiliary function, and this in turn yields sufficient information to control solutions of the original system.
Uniqueness in a Navier–Stokes-nonlinear-Schrödinger model of superfluidity*
Authors: Jayanti Pranava Chaitanya , Trivisa Konstantina 
Published: June 2022

Abstract
In Jayanti and Trivisa (2022 J. Math. Fluid Mech.
24 46), the authors proved the existence of local-in-time weak solutions to a model of superfluidity. The system of governing equations was derived in Pitaevskii (1959 Sov. Phys. JETP
8 282–287) and couples the nonlinear Schrödinger equation and the Navier–Stokes equations. In this article, we prove a weak–strong type uniqueness theorem for these weak solutions. Only some of their regularity properties are used, allowing room for improved existence theorems in the future, with compatible uniqueness results.
Performance enhancement of perovskite solar cells based on a CdO-quantum dot/TiO2-nanocrystal array electron transport layer
Authors: Su Chaoying , Wang Yuwen , Wu Jing , Xu Huanyan , Zhou Hong , Jin Liguo 
Published: June 2022

Abstract
An oriented TiO2 nanocrystal array (TiO2-NA) shows a unique electron extraction capability for perovskite solar cells (PSCs) due to it having fewer grain boundaries and high crystallinity for effective charge collection. Based on these advantages, we prepared PSCs based on TiO2-NA mesoporous film (mp-film), and chose CdO quantum dots (QDs) as the modifier of the TiO2-NA mp-film. The diameter of a single TiO2-NA and the TiO2-NA gap were controlled by controlling the hydrothermal reaction time. The CdO-QDs/TiO2-NA mp-film, as the electron transporting layer (ETL), was prepared by successive ionic layer adsorption and the reaction-sintering method. In this work, oxidation state CdO QDs were first used as the modifier in the ETL of the PSC. We gradually optimized the CdO/TiO2-NA mp-film by controlling the hydrothermal reaction time of TiO2-NA to improve PSC performance. Infiltration of the perovskite absorber–submicrometer-thick rutile TiO2-NA mp-films with Spiro-MeOTAD yielded a strikingly high photoelectric conversion efficiency of 11.94% under AM 1.5G illumination. The dependence of photovoltaic performance and interfacial electronic behavior on the length of the CdO/TiO2-NA was also investigated.
High power density soft x-ray GaAs photodiodes with tailored spectral response
Authors: Donetski Dmitri , Kucharczyk Kevin , Liu Jinghe , Lutchman Ricardo , Hulbert Steven , Mazzoli Claudio , Nelson Christie , Podobedov Boris 
Published: June 2022

Abstract
GaAs photodiode arrays have been designed for non-destructive monitoring of x-ray beam position in soft coherent beamline front ends in synchrotron light sources. A shallow p-on-n junction was employed to reduce the device photocurrent density to optimize the operation with beam power densities up to 20 W mm−2, mainly coming from hard x-rays. With this approach, the photocurrent is primarily defined by the excess carriers generated by low-energy x-ray photons absorbed near the detector surface. The p–n junction structures were grown by molecular beam epitaxy and processed into 64-element linear photodiode arrays. The devices were characterized first in the visible range with a high-power Ar-ion laser and then tested in the soft and hard x-ray regions up to 10 keV at two beamlines of the National Synchrotron Light Source II. The responsivity was measured to be 0.16 A W−1 at 0.7 keV and 0.05 A W−1 at 6 keV in agreement with modeling. At higher x-ray energies the measured responsivity was lower than predicted in the framework of the carrier diffusion model; a possible explanation is discussed.
Probability seismic demand and fragility analyses of novel SMA-based self-centring eccentrically braced frames
Authors: Chen Zhi-Peng , Zhu Songye 
Published: June 2022

AbstractThis paper performs the seismic assessment of novel shape memory alloy (SMA)-based self-centring (SC) eccentrically braced frames (EBFs) by using probabilistic seismic demand analysis (PSDA) and probabilistic seismic fragility analysis (PSFA). The structural finite element models are established based on a previous prototype building and verified through test results. The PSDA is based on a set of 176 seismic records, andSaavgis chosen as the proper intensity measure for max inter-storey drift ratio (MIDR) and max inter-storey residual drift ratio (MIRR); whereas peak ground acceleration is more suitable for peak floor acceleration (PFA). After the PSDA results are obtained, time-history analyses and PSFA are conducted. Compared with traditional steel EBFs, the SMA-based SC-EBF shows a slight weakness in MIDR due to the comparatively small energy dissipation capacity but has an apparent advantage in controlling MIRR due to a good SC capacity provided by SMA angles. Furthermore, although the steel EBF with fixed column bases has the smallest MIDR, the fixed bases cause extra damage in column bases, which will bring other problems in post-earthquake rebuild and deviate from the design target of concentrating damage in link beams. The variability of the PFA is small, showing that the influence of structural forms on PFA is not apparent. Considering the overall structural seismic performances in terms of MIDR, MIRR and PFA, SMA-based SC-EBF can be a promising alternative in future seismic-resistant designs.
Separation behaviour of polypropylene mixed particles under the coupling of vibration and airflow
Authors: Zhao Lei , Ma Xuedong , Li Lingling 
Published: June 2022

Abstract
Granular matter is a disordered system composed of a large number of particles, which appears as a complex physical phenomenon under external excitation. To study the separation behaviour of polypropylene particles, the separation of particles under various excitation methods was simulated based on the DEM-CFD coupling method. The results showed that polypropylene particles did not show Reverse Brazil Nut Separation under the single excitation of either vertical vibration or pulsed airflow, while under the double excitation of vertical vibration and constant airflow, the large particles located in the upper layer of small particles started to sink and formed Reverse Brazil Nut Separation. By analysing the change of voidage in particle bed, the explanation of the change of particle separation state by filling theory is verified. The airflow velocity increased from 15 m·s−1 to 21 m·s−1, and the volume concentration of large particles at the bottom increased by 27.615%, which promoted the formation of Reverse Brazil Nut Separation. The frequency and amplitude increased to 15 Hz, 20 mm or decreased to 5 Hz, 5 mm, respectively, and the volume concentration of large particles at the bottom decreased by 22.025%, 23.807% and 46.712%, 59.003%, indicating that too large or too small vibration acceleration would inhibit the formation of Reverse Brazil Nut Separation. In addition, changing the shape of the container or increasing the filling rate of particles in the container can eliminate the phenomenon of small particles accumulating in the corner.
Near field propagation of hollow higher-order cosh-Gaussian beam in jet engine induced turbulence
Authors: Bayraktar Mert 
Published: June 2022

Abstract
Propagation of hollow higher-order cosh-Gaussian (HHOCG) beam through jet engine induced turbulence is analyzed in this article. Special form of Huygens–Fresnel integral is solved in order to find averaged received intensity. Since beam shows rapidly focusing behavior, intensity profile is analyzed for short propagation distances. Beam evolves into four petal shape at short distance and size of hollow in the center is directly proportional with beam parameters. Raise in these parameters brings longer focusing point along propagation axis. Surprisingly, beam shows focusing behavior along propagation. According to our results, we think that especially this focusing trend is useful for applications required line of sight alignment like directed infrared counter measure (DIRCM).
Inertial force in separators used for oil treatment units
Authors: Yagafarova Kh N , Zaydullina A N 
Published: June 2022

Abstract
The paper studies the force of inertia to appear both in individual parts and assemblies of separators exploited for oil and gas treatment, and in separators as such. The concept of the force of inertia is important due to the possibility of considering it from deeper scientific points of view and practical positions.
Wave-pulse simulation in high-viscosity oil wells
Authors: Shipulin A V , Mingulov I Sh , Mukhametshin V V , Mingulov Sh G , Kuleshova L S 
Published: June 2022

Abstract
The thixotropic properties of high-viscosity oils have been found to be highly dependent on temperature and pressure treatment. As the temperature increases, the efficiency of the wave-pulse method to reduce the thixotropic properties of high-viscosity oil increases. The effect of the wave interference on the productive formation decreases over time, and after 3-7 days of development, the well must be treated again to ensure its operation in an intensive mode. Wave-pulse treatment facilitates the separation of light fractions from high-viscosity oil and hydrophobization of the reservoir. Heat and wave-pulse treatments complement each other and contribute to a complex effect on high-viscosity oil, but they must be carried out simultaneously or alternated with minimal interruptions in order to avoid the space lattice restoration.
Improvement of disc stack centrifuge design to increase efficiency of formation fluid separation
Authors: M Ya Khabibullin 
Published: June 2022

Abstract
It should be noted that numerous theoretical studies on flow hydromechanics in the centrifugal field have not been sufficiently used in designing separators with a high productivity index. This is caused by the extreme complexity of the flow conditions of the separated liquid in the intrarotor space. Therefore, experimental studies of intra-rotor flows have now gained great importance. The obtained results of studies carried out on a real product at a pressure and flow rate corresponding to production conditions made it possible to create and manufacture an industrial sample of the assembly. The authors use experimental data to calculate similar hydrocyclones ment for operation with other mixtures.
Introduction of modern information and communication technologies in transport flow management
Authors: Abdullaev Z , Ziyodullaeva G E , Muhamedieva D T 
Published: June 2022

Abstract
The article proposes an economic mechanism for regulating the route network, the calculation of which allows you to choose a transport route, as well as calculate the number of flights based on the condition of achieving a break-even transport process for carriers of various forms of ownership. The Work deals with the solution of problems related to the choice of a route, which belong to the class of complex combinatorial optimization problems. They don't have simple analytical solutions. As the number of nodes increases, the computational complexity increases exponentially. The Work proposes an alternative method for solving routing problems based on the use of neural network models, which allow obtaining good suboptimal solutions with a significant reduction in time costs. As in the Hopfield network, a matrix of neurons is used here, but neurons interact not on the "each with each" principle, but in rows and columns.
Network architectures and protocols of M2M communications
Authors: Khasambiev I V , Guseva E A 
Published: June 2022

Abstract
The issues of building the architecture of M2M networks and managing M2M services using the capabilities of the IMS platform are considered Introduction. M2M (Machine to Machine) is a complex of technologies that provide automatic interaction between devices (things) without human intervention. The Internet of Things is not a single technology, but a whole system of technological solutions. It is a global network infrastructure, which consists of computer networks of physical objects, the traditional IP Internet, and various devices connecting these networks.
Developing method for constructing modular turbo code for anti-jam satellite authentication system
Authors: Kalmykov I A , Mukhametshin V Sh , Tyncherov K T , Selivanova M V 
Published: June 2022

Abstract
Low-earth orbit (LEO) satellite communication systems must have anti-jam property, which is based on information, structural and energy secrecy as well as immunity to jamming. One of the directions associated with increasing information secrecy is based on the use of a satellite identification system. This system is designed to prevent the imposition of foreign content on the subscriber through the use of an authentication protocol built on proof with zero knowledge. To reduce the time of applicant identification, a number of works propose to use modular codes (MC), which allow parallelizing the computational process in the protocol. It is known that MCs can improve the fault tolerance of the identification system since they are able to eliminate the consequences of faults and failures during operation. However, they can also be used to improve the immunity of LEO satellite communication systems to jamming. Thus, the use of a unified algebraic system when constructing MCs capable of correcting errors caused not only by faults and failures during the operation of the identification system but also by interference in the communication channel will enable to abandon concatenated codes. Therefore, the development of a method for constructing a modular turbo code for an anti-jam satellite authentication system is an urgent task.