bluuebunny/crossref_metadata_2025_split huggingface dataset:
Flexible and thermally stable resistive switching memory in a Ta/TaOx/stainless steel structure
Authors: Zhang Lei , Yu Hao , Xiong Lingxing , Si Jiawei , Wang Liancheng , Zhu Wenhui 
Published: July 2020

Abstract
Flexible and thermally stable resistive switching (RS) behaviors were studied based on a Ta/TaOx/stainless steel (SS) structure. This memory device demonstrates good mechanical endurance and information retention using the amorphous characteristic of TaOx. In addition, a 500 °C thermal annealing treatment when applied to a Ta/TaOx/SS memory device can effectively improve its thermal stability, and especially its resistance retention properties. Stable and flexible RS behaviors were observed at a test temperature of 200
°C for the memory device annealed at 500 °C. The improved thermal stability may be attributed to the formation of an amorphous-nanocrystalline mixed structure in the annealed TaOx film, preventing degradation of the resistance state. The presented RS behavior, with remarkable flexibility and thermal tolerance has potential applications in harsh environments, such as high-temperature flexible electronic devices.
Efficient broadband vibration energy harvesting based on tuned non-linearity and energy localization
Authors: Aouali Kaouthar , Kacem Najib , Bouhaddi Noureddine , Mrabet Elyes , Haddar Mohamed 
Published: July 2020

Abstract
In this letter, non-linearity and energy localization are experimentally tuned in an electromagnetic vibration energy harvester in order to enhance its output performances. The non-linear device consists of two moving magnets guided by elastic beams and coupled by a repulsive magnetic force. The mechanical non-linearity is introduced by considering large displacements of the beams and the energy localization is achieved by mistuning the mass of one of the moving magnets. The critical load resistance is determined experimentally in order to tune the non-linearity level and to drive the harvester beyond its critical amplitude. Consequently, the performances of the device, in terms of harvested power only from the perturbed dof oscillator and frequency bandwidth, are enhanced respectively up to 19.4% and 116% compared to the performances of the non-linear periodic system.
Spin Nernst effect in a p-band semimetal InBi
Authors: Zhang Yang , Xu Qiunan , Koepernik Klaus , Fu Chenguang , Gooth Johannes , van den Brink Jeroen , Felser Claudia , Sun Yan 
Published: July 2020

Abstract
Since spin currents can be generated, detected, and manipulated via the spin Hall effect (SHE), the design of strong SHE materials has become a focus in the field of spintronics. Because of the recent experimental progress also the spin Nernst effect (SNE), the thermoelectrical counterpart of the SHE, has attracted much interest. Empirically strong SHEs and SNEs are associated with d-band compounds, such as transition metals and their alloys—the largest spin Hall conductivity (SHC) in a p-band material is

∼
450

ℏ
/
e

Ω

c
m

−
1

for a Bi–Sb alloy, which is only about a fifth of platinum. This raises the question whether either the SHE and SNE are naturally suppressed in p-bands compounds, or favourable p-band systems were just not identified yet. Here we consider the p-band semimetal InBi, and predict it has a record SHC

σ

x
y

z

≈
1100

ℏ
/
e

Ω

c
m

−
1

which is due to the presence of nodal lines in its band structure. Also the spin-Nernst conductivity

α

z
x

y

≈
1.2

(

ℏ
/
e

)

(

A
/
m
⋅
K

)

is very large, but our analysis shows its origin is different as the maximum appears in a different tensor element compared to that in SHC. This insight gained on InBi provides guiding principles to obtain a strong SHE and SNE in p-band materials and establishes a more comprehensive understanding of the relationship between the SHE and SNE.
Educational programs improvement directions of different levels in high school
Authors: Isaev A P , Plotnikov L V 
Published: July 2020

Abstract
The paper presents the results of research on the possibilities to improve the educational process at the university and the basic conditions of their realization. The authors developed the model of the next generation education program (EP) based on the analysis of the experience of “International Society for Engineering Pedagogy” and the CDIO. The paper presents data poll of young and experienced lecturers on need and importance of the next generation EP, as well as the readiness of their education departments and teachers to implement the next generation EP requirements in training bachelors and masters. Qualification characteristics of university lecturers, capable of solving problems of the next generation EP development and effective implementation; requirements for methodological tools for educational process monitoring; needs to raise the educational culture in order to form valuable attitude and responsibility of both lecturers and students for the results of their joint work are defined in the paper on the basis of empirical data. Generalization of results of the research allowed formulation of a number of actual tasks for education departments since their decision influences the quality of the ultimate results realized in the educational process.
Mathematical model and calculation results of the kerosene aerosol combustion rate
Authors: Poryazov V A , Moiseeva K M , Krainov A Yu , Krainov D A 
Published: July 2020

Abstract
This paper presents a mathematical combustion model of the kerosene aerosol and the calculation results of the combustion front normal velocity. The model is based on the dynamic equations of the two-phase reacting medium and consists of the energy equations for the gas and kerosene droplets, taking into account heat exchange, evaporation and heat release from the kerosene-oxygen reaction in the air; mass conservation equations for the gas, droplets, oxygen and kerosene, controlling the mass exchange between the phases and the burning of the reagents; the motion equation of the droplets; the particle number equations for the of droplets per unit volume; the ideal gas equation. The model assumes the isobaric conditions of the aerosol combustion. The obtained (calculated) propagation velocity of the kerosene aerosol combustion front, depending on the kerosene mass concentration and the initial temperature of the mixture, is in good agreement with the experimental data.
Injection of high-speed cryogenic liquid jets in a vacuum
Authors: Boukharov A V , Ginevsky A F , Vishnevsky E V 
Published: July 2020

Abstract
The purpose of the present work is to numerically calculate cooling of thin deuterium jets to create units for receiving high-speed cryogenic monodisperse targets. The model of cryogenic jet outflow into the low pressure area has been created. Using PHOENICS software the temperature change of the surface and the interior of a jet over time for various external parameters has been investigated by the numerical method. The dependences of temperature changes of liquid deuterium jets have been obtained along the jet surface and along the radius depending on the jet diameter, velocity, initial jet temperature and pressure in the working chamber of units for receiving cryogenic monodisperse targets. The principal possibility of creating high-speed cryogenic monodisperse targets is shown. According to the calculations, at injection of thin liquid Deuterium jets with a speed of up to 100 ms‒1 into the working chamber with low pressure, the jets do not have time to freeze at a distance of up to 1 mm. The results of numerical calculations can be used to develop units for receiving high-speed cryogenic mono-disperse targets.
Method for constructing fundamental equation of state based on the relationships of similarity theory and scaling hypothesis
Authors: Rykov S V , Kudryavtseva I V , Rykov V A 
Published: July 2020

Abstract
On the basis of the new phenomenological theory of the critical point, the method for constructing fundamental equation of state (FEoS) of liquid and gas has been developed. Within the framework of the method proposed, a number of requirements are met: a) in the region of low densities, the transition of FEoS to the virial equation; b) in a wide vicinity of the critical point, the transition of FEoS to the Berestov equation; c) taking into account asymmetry in the behavior of the isochoric heat capacity, isothermal compressibility coefficient and other thermodynamic functions relative to the critical isochore. To calculate the singular component of FEoS, the Pokrovsky transformations and the similarity relation connecting the parameters of a lattice gas and a real liquid are used. It has been shown that such an approach requires only knowledge of the density data on the saturation line and the values of the critical indices to calculate the singular component of FEoS. This allows us to exclude data on the isochoric heat capacity from the calculation scheme and recommend this method for constructing FEoS of substances little studied in the vicinity of the critical point. The method has been tested on the example of constructing carbon dioxide FEoS. The workspace of FEoS has been set: by temperature 216.592 ≤ T ≤ 1100 K and by pressure up to 200 MPa. The results obtained are discussed.
Experimental study of the density of octafluorocyclobutane in the liquid and supercritical area of states
Authors: Granchenko P P , Kuznetsov K I , Sukhikh A A , Skorodumov S V 
Published: July 2020

Abstract
This work is a continuation of the cycle of studies of the pρT-surface of octafluorocyclobutane in the range of parameters of the state of operation of power plants. The new data of the following series of measurements of the density of octafluorocyclobutane, obtained by the method of a constant-volume cell, are presented. The measurements were carried out on 5 isotherms in the liquid and supercritical regions in the range of temperature from 25°C to 143°C and pressures from 1.6 to 10.9 MPa. The density uncertainty was estimated by the authors at no more than 0.2%. The resulting thermal surface is described by a polynomial with 20 coefficients. The mean square deviation of the experimental points from the calculated ones was 0.026%.
Development of a multi-generating complex with combined fuel in the production of hydrogen and oxygen
Authors: Petin S N , Goldobin D D , Burmakina A V 
Published: July 2020

Abstract
The article presents the research result on increasing the energy efficiency of thermal power plants (TPP). The centralized production of hydrogen at thermal power plants by multigeneration is proposed. A multigeneration complex was developed with additional production of hydrogen and oxygen. An exergy and economic analysis was carried out for TPPs with an electrical capacity of 230 MW and a thermal capacity of 394 Gcal/h. The comparison of the TPP in the current mode and in the multigeneration mode at its transfer to the nominal mode with the aim of additional production of hydrogen and oxygen was performed. The efficiency of the plant transition to the multi-generation mode with both economic analysis and exergy analysis has been proved.
Flow evolution in the near field of a turbulent annular jet
Authors: Philippov M V , Chokhar I A , Terekhov V V , Terekhov V I 
Published: July 2020

Abstract
The results of an experimental study of the flow structure in the near zone of an annular swirling jet are presented. The data were obtained using a two-component laser-Doppler anemometer for the annular jets with a swirl angle of 0–60°. The results of measurements of the average velocity and pulsations in the near jet region (up to 5 diameters of the outer ring) are presented. Based on the analysis performed, it is shown that formation of an internal toroidal vortex near the nozzle plays an important role in the flow dynamics and the process of annular jet mixing. Formation of a stationary toroidal vortex outside the ring is also noted. These structures determine the flow in the near zone of the jet. With the studied Reynolds numbers, this character of the flow in the near zone leads to an increase in the mixing rate, high degree of turbulence, and an increase in the jet ejection capacity.
Experimental study of the molten metal relocation on the surface of the heated rod
Authors: Lobanov P D , Svetonosov A I , Usov E V 
Published: July 2020

Abstract
The investigation of the liquid metal melt flow along the surface of a heated rod is carried out. Experimental studies were provided in a seven-rod assembly. In this series of experiments, only the central rod of the assembly was heated. All rods of the assembly were in a stream of the heated argon. Aluminum and zinc were used as the material of the model cladding of the rods. The dynamics of temperature and the movement of the molten cladding along the surface of the heated rod were studied. Obtained results may be useful for validating computer codes to simulate beyond design accidents in nuclear power plants.
Structure and thermal conductivity of carbon multilayered “onion” fullerenes
Authors: Zarichnyak Yu P , Ivanov VA , Marova A A , Pilipenko N V 
Published: July 2020

Abstract
Using the proposed model of the structure of carbon multilayer “onion” fullerenes, approximate quantitative estimates of the effective thermal conductivity of multilayer onion fullerenes are obtained using the methods of generalized conductivity theory.
Correlation between heat transfer and microstructure of turbulent flow in ribbed channel
Authors: Mikheev N I , Dushin N S , Dushina O A , Shakirov R R 
Published: July 2020

Abstract
Heat transfer and turbulence in channel flows past either a single rib or a rib array installed on the wall have been studied experimentally. It has been revealed that the local heat transfer coefficient behind a rib and a rib array is statistically closely related to RMS fluctuations of the vertical component of velocity in the near-wall region. This result points to a possible way to control the hydrodynamics aiming at heat transfer enhancement in turbulent flows in the channels with discrete roughness.
Kinetic Modeling of Pyrolysis and Combustion of High-Density Polyethylene-Based Polymer Mixtures
Authors: Handawy M Koraiem , Snegirev A Yu , Stepanov V V , Talalov V A 
Published: July 2020

Abstract
In this study, the pyrolysis and combustion of a binary mixture of most waste polymers (HDPE and PC) were investigated using MCC measurements at different heating rates of 0.25, 0.5, 1, 1.5 K/s. The non-isothermal kinetic analysis of mixture was conducted for equally mass fraction ratio of 50% HDPE and 50% PC, as well as for individual polymers. The activation energy was calculated by the isoconversional methods (Friedman, Kissinger-Akahira-Sunose, Flynn-Wall-Ozawa). The estimated activation energy on the conversion equals to 0.1-0.95. The Friedman method being more sensitive, as is shown by the variation of decomposition of PC and the first stage for a blend of HDPE/PC. As the equations used in FWO and KAS methods are derived assuming constant activation energy, which produces systematic errors in the estimation of Ea, so they have the same profile but FWO always is higher than KAS.
Estimation of methane hydrates dissociation kinetic coefficients at T < 273 K
Authors: Donskoy I G , Misyura S Ya 
Published: July 2020

Abstract
To simulate and optimize the processes of low-temperature processing of methane hydrate, it is necessary to obtain appropriate information on the kinetic coefficient of the dissociation process. Excluding self-preservation in the analysis of experimental data, general patterns can be distinguished, including estimating the activation energy of the dissociation process (in the approximation of a shrinking core). The obtained kinetic coefficients were used to reproduce the kinetic curves obtained by different authors. These coefficients are recommended for using in kinetic models of methane dissociation hydrate in the temperature range T < 273 K.
Promotion of osteointegration under diabetic conditions by a silk fibroin coating on 3D-printed porous titanium implants via a ROS-mediated NF-κB pathway
Authors: Ma Xiang-Yu , Ma Tian-Cheng , Feng Ya-Fei , Xiang Geng , Lei Wei , Zhou Da-Peng , Yu Hai-Long , Xiang Liang-Bi , Wang Lin 
Published: July 2020

Abstract
Clinical evidence indicates the compromised application of titanium implants (TIs) in diabetics, associated with reactive oxygen species (ROS) overproduction at the bone-implant interface. Silk fibroin (SF) has displayed impressive biocompatibility in the application of biomedical material and optimal anti-diabetic effects in oriental medicine. We proposed that SF-coated titanium implants (STIs) could alleviate diabetes-induced compromised osteointegration, which has rarely been reported before. To confirm this hypothesis and explore the underlying mechanisms, rat osteoblasts cultured on 3-dimensional (3D) -printed titanium implants (TIs) and STIs were subjected to normal serum (NS), diabetic serum (DS), DS with N-acetyl-L-cysteine (a ROS inhibitor) or SN50 (an NF-κB inhibitor). An in vivo study was performed on diabetic sheep with TIs or STIs implanted into bone defects on the crista iliaca. The results demonstrated that ROS overproduction induced by diabetes lead to osteoblast dysfunctions and cellular apoptosis on the TI substrate, associated with the activation of an NF-κB signaling pathway in osteoblasts. Importantly, the STI substrate significantly attenuated ROS production and NF-κBp65 phosphorylation, thereby ameliorating the osteoblast biological dysfunctions. These results were further confirmed in vivo by the improved osteointegration of the STIs, as evidenced by Micro-CT and histological examinations compared with those of TIs. These results demonstrated that the ROS-mediated NF-κB signaling pathway played a crucial role in diabetes-induced implant destabilization. Importantly, the SF coating, as a promising material for biomaterial-engineering, markedly improved the clinical treatment effect of TIs under diabetic conditions, possibly associated with the suppression of the NF-κB pathway.
Bifurcations and chaos in nonlinear Lindblad equations
Authors: Fernengel Bernd , Drossel Barbara 
Published: July 2020

Abstract
The Lindblad equation describes the dissipative time evolution of a density matrix that characterizes an open quantum system in contact with its environment. The widespread ensemble interpretation of a density matrix requires its time evolution to be linear. However, when the dynamics of the density matrix is of a quantum system results not only from the interaction with an external environment, but also with other quantum systems of the same type, the ensemble interpretation is inappropriate and nonlinear dynamics arise naturally. We therefore study the dynamical behavior of nonlinear Lindblad equations using the example of a two-level system. By using techniques developed for classical dynamical systems we show that various types of bifurcations and even chaotic dynamics can occur. As specific examples that display the various types of dynamical behavior, we suggest explicit models based on systems of interacting spins at finite temperature and exposed to a magnetic field that can change in dependence of the magnetization. Due to the interaction between spins, which is treated at mean-field level, the Hamiltonian as well as the transition rates of the Lindblad equation become dependent on the density matrix.
Studied on Thermal Coupling and Sealing Characteristics of the Subsea Wellhead Connector Metal Seal
Authors: Li Yufang , Zhao Honglin , Wang Deguo , Li Xinghong , Zhao Tongxu 
Published: July 2020

Abstract
The sealing between subsea trees and high pressure wellhead is achieved by the metal seal inside the subsea wellhead connector. In this paper, the sealing performance of the metal seal under the dual role of load and temperature is analyzed. The theoretical analysis of the heat conduction in the sealing part of the subsea wellhead connector is carried out, and the basic equation of heat transfer for transient heat conduction is established, finite element simulation calculations were carried out to obtain the thermal stress of subsea wellhead sealing parts in the process of preload and operating. The results show that as the internal pressure of the subsea wellhead increases, the equivalent contact stress inside the metal seal gradually decreases, and the equivalent stress on the sealing surface is still greater than the initial sealing pressure, ensuring the sealing effect. As the internal pressure of the wellhead increases, the contact stress on the sealing surface of the metal seal increases gradually, with the increases of the temperature, the contact stress increases continuously, when the temperature is too high, the negative impact on the seal is relatively large, resulting in excessive stress inside the seal, which is prone to seal crushing accidents. The temperature effects can be reduced by appropriately reducing the amount of axial preload compression to avoid the metal seal failure.
Design and Fabrication Technology of a PAU and PAR Project
Authors: Wu Qiang 
Published: July 2020

Abstract
This paper describes the design and fabrication process of a solvent deasphalter unit which included 5 PAUs (Pre-Assembled Process Module Units) and 5 PARs (Pre-Assembled Piperacks) at a refinery in Rotterdam. This paper summarizes the method and experience successfully applied to the shop design and construction process of PAUs and PARs, illustrates the prefabrication and the assembly process of PAU and PAR modules. Many challenges were encountered during the one and a half years’ fabrication, such as mass drawing sheets, fabricate in line with DEP specification and Eurocodes, assembly sequence optimization, the integrate construction method, dimension control and quarantine etc. Design and fabrication processes such as relevant code and standards, shop design softwares, work process of shop design, the application of management system, module arrangement, the process of prefabrication and assembly sequence, the integrate construction method and loadout are highlighted. In the shop design process, 3D Model played a key role. The application of management systems such as PCMS and WIMS significantly improved the efficiency of construction management. Reasonable construction sequence and schedule ensure good performance of fabrication activities. The integrate construction significantly reduced the workload of high altitude work and minimized the project period with efficient construction. It is hoped that the construction experience of this project can give some reference and benefit to similar project in the future.
Boundary Layer Development Process under the Propagation of a Solitary Wave
Authors: Chang CH 
Published: July 2020

Abstract
When a generated solitary wave starts to propagate, it needs an establishment distance to create fully developed velocity profiles. We consider that the solitary wave moving in a viscous fluid under laminar flow. An important detail to state is the proper location to measure the solitary wave velocity profile due to its finite extent. This article discusses the establishment distance and the reattachment point on the bottom in the wave’s deceleration phase.