bluuebunny/crossref_metadata_2025 huggingface dataset:
Future investment value of China’s listed life insurance companies’ H shares from the perspective of secondary market
Authors: Yang Lixin
Published: December 2020

China’s life insurance industry has just started in the 1990s after the reform and opening up, and its development experience is obviously insufficient, and it has not gone through a very complete life insurance development cycle. No matter from the actuarial technology, the professional level of the agent, the popularization time of the agent system, or the management experience, it is far from the developed areas of the world’s life insurance industry. In addition, many professional investors are worried about the future prospects of China’s life insurance industry because of the long-term existence of a low interest rate environment.

However, after reading detailed materials (research papers, books, reviews, etc.), the final conclusion of this report is different from that of other too cautious investors . This report holds that: the current situation and prospect of China’s life insurance H shares meet the conditions of Davis double-click, and the main investors in the secondary market will encounter a unique opportunity to obtain excess returns by investing in domestic insurance H shares. On the level of objective factors, we analyze from the following four aspects: (I) the potential demand for life insurance in China will continue to increase significantly in the future; (II) most of the representative life insurance companies in China have low valuations; (III) the possible style switching in China’s secondary market is conducive to the rise of blue chips such as life insurance companies; (IV) from the long-term perspective of history, the insurance index has significantly outperformed the Shanghai Composite Index, which represents the market. In terms of subjective factors, we consider them from the following four perspectives: (I) the development and problems of life insurance industry in Japan and Taiwan; (II) on the liability side, China’s life insurance industry vigorously develops new products with high business value, so as to resist the impact of low interest rates; (III) the diversification of asset allocation at the investment end of China’s life insurance industry can make the profit of life insurance industry not limited by the interest rate; (IV) the change of service quality at the supply side is conducive to the life insurance companies to tap the potential market demand in China.
Investigation of a cleaning procedure for silicon spheres used in the realization and dissemination of the redefined kilogram via combined spectroscopic and gravimetric measurements
Authors: Beyer Edyta , Borys Michael , Mecke Michael , Kolbe Michael
Published: December 2020

The new definition of the SI kilogram requires new methods of realizing this unit. The X-ray crystal density method is a primary realization method and uses silicon spheres. The spheres get cleaned before each measurement, in order to remove surface contaminations and thus reduce their uncertainty contribution to the realization. Therefore, cleaning is an inherent part of the realization and dissemination of the kilogram. A cleaning method for silicon spheres is investigated, concerning its suitability as a part of the realization of the redefined kilogram. Six silicon spheres were used to determine the repeatability of the established cleaning method. Measurements of the spheres' mass and the quantification of their surface layer mass after cleaning were carried out in several cycles resulting in 29 mass and surface measurements. The repeatability of the cleaning method applied shows a standard deviation in the order of two micrograms for both the mass and the surface layer. The cleaning method therefore sufficiently fulfils these requirements.
Editorial
Authors: Heling Kai-Sven
Published: December 2020

Dear Colleagues,

Now you get a new Issue of Ultrasound International Open. As always you can find a
mixture of different articles dealing with the main topic ultrasound.
Immature Platelets and Risk of Cardiovascular Events among Patients with Ischemic Heart Disease: A Systematic Review
Authors: Faber Julie , Hvas Anne-Mette , Kristensen Steen Dalby , Grove Erik Lerkevang , Adelborg Kasper
Published: December 2020

Background Immature platelets are larger and may be more thrombogenic than mature platelets. This systematic review included studies on the association between mean platelet volume (MPV), immature platelet count (IPC), and immature platelet fraction (IPF) and the risk of major cardiovascular events (MACEs) in patients with acute coronary syndrome (ACS) or stable coronary artery disease (CAD).

Methods The literature search included studies in PubMed, Embase, Web of Science, and Cochrane Library. The review was performed according to the Preferred Reporting Items for Systematic Reviews and Meta-Analyses (PRISMA) statement. Effect estimates that included multivariate adjusted odds ratios, relative risks, or hazard ratios were extracted.

Results Forty-two studies were identified. High MPV was positively associated with MACE in 20 of 26 studies of patients with ACS, four of five studies in patients with stable CAD, and in all six studies comprising a combined population with ACS and stable CAD. Using continuous models of MPV in patients with ACS, effect estimates varied from 0.90 (95% confidence interval [CI]: 0.95–1.03) to 1.66 (95% CI: 1.32–2.09). The strength of these associations was broadly similar among patients with stable CAD and in combined populations. Five studies investigated IPC or IPF as exposures and all reported positive associations with MACE among patients with ACS, stable CAD, or in combined populations.

Conclusion This review demonstrated clear evidence for positive associations between measures of immature platelets and subsequent risk of MACE in acute and stable ischemic heart disease patients.
Electric field dynamics in an atmospheric pressure helium plasma jet impinging on a substrate
Authors: Mirzaee Mahsa , Simeni Simeni Marien , Bruggeman Peter J.
Published: December 2020

Time and spatially resolved electric field measurements by Stark polarization spectroscopy in a nanosecond pulsed atmospheric pressure helium jet operating in ambient air and impinging on a indium tin oxide coated glass slide are reported. An automatic fitting procedure of the Stark shifted spectra taking into consideration constraints regarding Stark components' positions and intensities as well as molecular nitrogen emission subtraction was implemented. This allowed electric field vector component measurements both in the gas phase and at the interface when the jet impinges on the substrate and during the development of a surface ionization wave. The obtained results show an increase in the axial electric field in the jet effluent in the gas phase with a peak magnitude from 12 to 18 kV cm−1 before the ionization wave impinges on the substrate. A steep electric field enhancement to a peak value of about 24 kV cm−1 was observed when the ionization wave impinges on the surface. A peak radial electric field of about 27 kV cm−1 was measured off-axis in the surface ionization wave. These results are consistent with previously reported modelling predictions. While Stark polarization spectroscopy is limited to electric field measurements from regions with emission, we illustrate that the capability to measure near surface electric fields in helium makes it a valuable complementary technique for the electric field-induced second harmonic (EFISH) technique.
Effect of Reynolds number on drag reduction in turbulent boundary layer flow over liquid–gas interface
Authors: Li Hongyuan , Ji SongSong , Tan Xiangkui , Li Zexiang , Xiang Yaolei , Lv Pengyu , Duan Huiling
Published: December 2020

The liquid–gas interface (LGI) on submerged microstructured surfaces has the potential to achieve a large slip effect, which is significant to the underwater applications such as drag reduction. The mechanism of drag reduction in the laminar flow over the LGI has been well recognized, while it is yet not clear for the turbulent boundary layer (TBL) flow over the LGI. In the present work, an experimental system is designed to investigate the mechanism of drag reduction in TBL flow over the LGI. In particular, the flow velocity profile near the LGI is directly measured by high-resolution particle image velocimetry by which the shear stress and the drag reduction are calculated. It is experimentally found that the drag reduction increases as the friction Reynolds number (Reτ0) increases. An analytical expression is derived to analyze the effect of the LGI on drag reduction, which consists of two parts, i.e., the slip property and the modifications to the turbulence structure and dynamics near the LGI. Importantly, the measured slip property also increases as Reτ0 increases, which is demonstrated to be the key effect on drag reduction. This has revealed the mechanism of drag reduction in TBL flow over the LGI. The present work provides physical insights for the drag reduction in TBL flow over the LGI, which is significant to the underwater applications.
Numerical analysis of two-phase electrohydrodynamic flows in the presence of surface charge convection
Authors: Luo Kang , Wu Jian , Yi Hong-Liang , Tan He-Ping
Published: December 2020

The mechanism of surface charge convection (SCC) reveals inherently nonlinear coupling between the electrostatic problem and the hydrodynamic flow in the Melcher–Taylor electrohydrodynamic (EHD) model. Considering that most previous numerical models are based on decoupled leaky dielectric equations, the quantitative effect of SCC on two-phase EHD under different parameters remains unclear. In the present study, we propose a new numerical scheme to solve the two-phase EHD problems in the framework of the lattice Boltzmann method. The fully coupled equations including the Navier–Stokes equations, the Nernst–Planck equations, and the Poisson equation are solved using three well-designed lattice Boltzmann equations. The problem of droplet deformation under a uniform electric field is studied. By neglecting SCC at a small electric Reynolds number ReE ≪ 1, our model successfully reproduces previous theoretical and numerical results. When considering the SCC mechanism at finite values of ReE, the intensity of the EHD flow is reduced. Consequently, oblate droplets are predicted to be less deformed, while prolate droplets are enhanced. In addition, the SCC effect increases as the values of both ReE and the electric capillary number, Ca, increase. In addition, a sharp variation in surface charge density is observed near the equator of the droplet due to SCC.
Stability analysis and transition prediction of streamwise vortices over a yawed cone at Mach 6
Authors: Li Xiaohu , Chen Jianqiang , Huang Zhangfeng , Yang Qiang , Xu Guoliang
Published: December 2020

An investigation into the linear instability of streamwise vortices over a yawed blunt cone with a half-angle of 7° at 6° angle of attack, a free-stream Mach number of 6, and a Reynolds number of 1.0 × 107/m was performed. The steady laminar base flow obtained using direct numerical simulation (DNS) has a mushroom structure. Three classes of unstable modes (inner mode, outer mode, and Mack mode modified by the streamwise vortices) were identified using a two-dimensional spatial global stability analysis (bi-global). Among them, the inner mode and the modified Mack mode were discovered for the first time for such a configuration. Notably, the inner mode appears only over a short distance upstream of the cone, and its energy is mainly in the vicinity of the symmetry plane of the mushroom structure. By comparing with DNS results, it was shown that multiple instability modes can coexist physically during the transition in the leeward plane. In addition, the eN method based on global stability theory was used to predict the location of the transition along the centerline on the leeward side of the cone. It was found that the inner modes grow rapidly in the upstream region, while the outer mode near the stem of the mushroom structure dominates the transition in the downstream region. Further analysis suggests that the inner modes dominate the transition only in a noisy environment, whereas the traditional centerline modes dominate the transition in quiet free-stream conditions.
Electron energy-loss spectroscopy of surface plasmon activity in wrinkled gold structures
Authors: Mousavi M. S. Shayan , Bicket Isobel C. , Bellido Edson P. , Soleymani Leyla , Botton Gianluigi A.
Published: December 2020

The surface plasmon response of a cross-sectional segment of a wrinkled gold film is studied using electron energy loss spectroscopy (EELS). EELS data demonstrate that wrinkled gold structures act as a suitable substrate for surface plasmons to propagate. The intense surface variations in these structures facilitate the resonance of a wide range of surface plasmons, leading to the broadband surface plasmon response of these geometries from the near-infrared to visible wavelengths. The metallic nanoparticle boundary element method toolbox is used to simulate plasmon eigenmodes in these structures. Eigenmode simulations show how the diverse morphology of the wrinkled structure leads to its high spectral complexity. Micron-sized structural features that do not provide interactions between segments of the wrinkle have only a small effect on the surface plasmon resonance response, whereas nanofeatures strongly affect the resonant modes of the geometry. According to eigenmode calculations, different eigenenergy shifts around the sharp folds contribute to the broadband response and infrared activity of these structures; these geometrical features also support higher energy (shorter wavelength) symmetric and anti-symmetric plasmon coupling across the two sides of the folds. It is also shown that additional plasmon eigenstates are introduced from hybridization of modes across nanogaps between structural features in close proximity to each other. All of these factors contribute to the broadband response of the wrinkled gold structures.
Oblique droplet impact on superhydrophobic surfaces: Jets and bubbles
Authors: Guo Jianwei , Zou Song , Lin Shiji , Zhao Binyu , Deng Xu , Chen Longquan
Published: December 2020

Previous studies revealed that the perpendicular impact of low-viscosity droplets on sufficiently lyophobic surfaces would stimulate a liquid jet during droplet recoiling, and in some cases, it is accompanied with the entrapment of an air bubble. However, whether such free-surface flow phenomena occur in oblique droplet impact and how surface inclinations influence the dynamics remain open questions. Herein, we perform a comparative investigation on the perpendicular and oblique impact dynamics of water droplets on superhydrophobic surfaces. We show that the inclinations of the target surface do not influence the jet emission and the bubble entrapment in droplet impact. The jetting phenomena, which are triggered by the collapse of the air cavity, can be classified into three types of scenarios, and the jet velocity scales with its size according to two power laws as suggested by the scaling analyses in the previous studies. On the other hand, the air bubble entrapment is caused by the asymmetric cavity collapse when the recoiling speed of the droplet top is close to that of the bottom, and the bubble size can be reduced by the rising jet from the cavity bottom. We also show that some entrapped bubbles on inclined surfaces would move to the droplet surface and eventually burst, shooting out another thin jet. The correlation between the jet velocity and the bubble size is compared with different empirical scaling laws in the literature.
Review of Scientific Instruments New Products
Authors: Mandelis Andreas
Published: December 2020

In order to supplement manufacturers’ information, this department will welcome the submission by our readers of brief communications reporting measurements on the physical properties of materials which supersede earlier data or suggest new research applications.
Harvesting and post-harvest management for improving seed quality and subsequent crop yield of cotton
Authors: Kamran M. , Afzal I. , Basra S. M. A. , Mahmood A. , Sarwar G.
Published: December 2020

Quality seed is a prerequisite to uniform stand establishment, which contributes to higher crop yield. However, prevalence of poor-quality cottonseed with high moisture content due to suboptimal harvesting and postharvest practices is the primary reason for crop-stand failure in developing countries. The present study evaluated the effects of harvesting environment, drying method and storage conditions on seed quality of transgenic (FH-142) and non-transgenic (FH-942) genotypes of cotton (Gossypium hirsutum L.) cultivated in Pakistan. Both genotypes were picked three times at monthly intervals during the cropping season and subjected to a ginning process. Seed was then dried in the sun or with desiccant zeolite beads, and stored for 5 months in cloth or hermetic bags at room temperature or in paper bags at 10°C. The efficiency of storage systems was evaluated by estimating moisture content and germination potential periodically in the storehouse and later under field conditions. Both genotypes exhibited better seed quality attributes at the first picking, and zeolite beads dried seed to lowest moisture content more quickly than sun-drying. Seeds of both genotypes stored hermetically retained the lowest moisture content, maximum germination potential, and lower fatty acid contents throughout the storage period, as well as performing significantly better in the field by exhibiting early and uniform stand establishment, more fruiting branches and bolls, and higher yield. Thus, use of zeolite beads in post-harvest drying followed by hermetic storage preserves cottonseed quality for longer, and leads to improved crop growth and yield of cotton. These practices will be useful for cotton farmers in developing countries.
Pacific Fono: a community-based initiative to improve rheumatic fever service delivery for Pacific Peoples in South Auckland
Authors: The National Hauora Coalition  , Anderson Anneka , Brown Rachel , Wheeler Jadene , Jansen Rawiri McKree
Published: December 2020

ABSTRACT BACKGROUND AND CONTEXTRheumatic fever inequitably affects Māori and Pacific children in New Zealand. School-based throat swabbing services, such as the South Auckland Mana Kidz programme, are a key element of rheumatic fever prevention interventions. ASSESSMENT OF THE PROBLEMCounties Manukau has the highest national rates of rheumatic fever (4.7 per 100,000 for first recorded rates). Given these disparities, Mana Kidz undertook an exploratory, community-based initiative to improve its service delivery for Pacific Peoples. RESULTSMana Kidz held a Pacific Leaders’ Fono (meeting) to discuss initiatives to improve rheumatic fever outcomes in South Auckland focused around challenges and solutions for addressing rheumatic fever, effective engagement strategies and leadership qualities needed to drive initiatives. Oral and written responses from 66 attendees were collected and thematically analysed. Four key themes were identified around challenges and solutions for rheumatic fever: social determinants of health; cultural responsiveness; health system challenges; and education, promotion and literacy. Three effective engagement strategies were identified: by Pacific for Pacific; developing a rheumatic fever campaign; improving health services. Three key leadership attributes were identified: culturally responsive leaders; having specific expertise and skills; youth-driven leadership. STRATEGIES FOR IMPROVEMENTMana Kidz has now created Pacific leadership roles in rheumatic fever governance groups, promotes Pacific workforce development and endorses Pacific-led initiatives and partnerships. LESSONSRecognising the value of critical reflection and the importance of good governance and collaborative, right-based partnerships in health services.
Targeting transcriptional regulation of SARS-CoV-2 entry factorsACE2andTMPRSS2
Authors: Qiao Yuanyuan , Wang Xiao-Ming , Mannan Rahul , Pitchiaya Sethuramasundaram , Zhang Yuping , Wotring Jesse W. , Xiao Lanbo , Robinson Dan R. , Wu Yi-Mi , Tien Jean Ching-Yi , Cao Xuhong , Simko Stephanie A. , Apel Ingrid J. , Bawa Pushpinder , Kregel Steven , Narayanan Sathiya P. , Raskind Gregory , Ellison Stephanie J. , Parolia Abhijit , Zelenka-Wang Sylvia , McMurry Lisa , Su Fengyun , Wang Rui , Cheng Yunhui , Delekta Andrew D. , Mei Zejie , Pretto Carla D. , Wang Shaomeng , Mehra Rohit , Sexton Jonathan Z. , Chinnaiyan Arul M.
Published: December 2020

Significance

New therapeutic targets are urgently needed against SARS-CoV-2, the coronavirus responsible for the COVID-19 pandemic. Results in this study show that targeting the transcriptional regulation of host entry factorsTMPRSS2andACE2is a viable treatment strategy to prevent SARS-CoV-2 infection. In particular, inhibitors of androgen receptor (AR) or bromodomain and extraterminal domain (BET) proteins are effective against SARS-CoV-2 infection. AR inhibitors are already approved in the clinic for treatment of prostate cancer and are under investigation in COVID-19 patients; BET inhibitors are also in clinical development for other indications and could be rapidly repurposed for COVID-19.
The presentational dimension of Geert Wilders’s populist argumentative style
Authors: Jansen Henrike , Leeuwen Maarten van
Published: December 2020

This study responds to van Eemeren’s (2019, 2021) call for research on the prototypical argumentative styles used in particular domains or
communicative activity types by particular individuals or groups. It explores the argumentative style of Dutch politician Geert
Wilders in presenting populist arguments, i.e., arguments claiming that if many people hold a certain standpoint, this standpoint
should be accepted. A corpus study of 27 texts taken from the website of Wilders’s political party reveals four characteristics of
this presentation that deviate significantly from the general descriptions of this type of argument given in the textbooks: (1) absence of indicators, (2) implicit standpoint, (3) wide range of verbs to indicate what “the people” think or believe, (4) use of
a construction indicating that the speaker is acting as a mouthpiece (“on behalf of the people, I say”).
Six related essays on argumentative style
Authors: Eemeren Frans H. van
Published: December 2020

This introduction to the special issue devoted to argumentative style describes the way in which this collection of six
papers came about. It recapitulates the main thrust of the issues that are included. All authors share the pragma-dialectical perspective on
argumentative style set forth in the first contribution, in which argumentative style is connected with strategic manoeuvring. In analysing
argumentative styles, they concentrate on different kinds of argumentative discourses and have a different emphasis in carrying out their
analyses.
Examining argumentative style
Authors: Eemeren Frans H. van
Published: December 2020

In this theoretical expose, it is argued that the notion of argumentative style is more encompassing and at the same time
more specific than the more familiar notion of linguistic style. According to van Eemeren, argumentative styles always have three
dimensions: the selection of standpoints, starting-points, arguments or other argumentative moves (topical choice dimension), the adjustment
of argumentative moves to the frame of reference and preferences of the listeners or readers (audience demand dimension), and the choice of
verbal or non-verbal means for advancing argumentative moves (presentational dimension). In argumentative discourse, the three dimensions of
argumentative style manifest themselves in the argumentative moves made in trying to resolve a difference of opinion (analytic overview),
the dialectical routes chosen in making these argumentative moves (argumentative pattern) and the strategic considerations brought to bear
in this endeavour (strategic design). Van Eemeren explains what this means in practice by discussing the distinctive features of the three
dimensions of two general categories of argumentative styles that can be regularly encountered, in one variant or other, in argumentative
discourse: detached argumentative styles and engaged argumentative styles.
Fetal Alcohol Spectrum Disorder and Neurodevelopmental Disorders: An International Practice Survey of Forensic Mental Health Clinicians
Authors: McLachlan Kaitlyn , Mullally Katelyn , Ritter Chantel , Mela Mansfield , Pei Jacqueline
Published: December 2020

Individuals with fetal alcohol spectrum disorder (FASD), a neurodevelopmental disorder caused by prenatal exposure to alcohol, are overrepresented in criminal justice settings and have complex, forensically relevant clinical needs. This study surveyed 81 forensic clinicians recruited via international professional association listserv postings and social media about their assessment and intervention practices in providing services to clients with FASD and other neurodevelopmental disorders (NDDs), along with their training experiences and needs in this area. Results indicated that the majority of clinicians had forensic experience working with clients who had FASD and other NDDs, although most identified limited relevant training experiences, gaps in their readiness for service provision, and practice barriers in effectively working with these populations. Clinicians also reported seeing fewer clients with FASD relative to other NDDs, and feeling less prepared for forensic practice with this population. Most clinicians endorsed the need for additional training and supports to increase their competency and enhance their practice, such as the development of screening tools, clinical guidelines, and access to experts or specialists for consultation. As awareness about FASD continues to grow in legal contexts, additional research, training, and policy consideration is required to develop and implement evidence-based practice resources for forensic clinicians.
A feasibility study of radar-based shape and reflectivity reconstruction using variational methods
Authors: Bignardi Samuel , Joseph Yezzi Anthony , Yildirim Alper , Barnes Christopher F , Sandhu Romeil
Published: December 2020

Remote sensing radar techniques provide highly detailed imaging. Nevertheless, radar images do not offer directly retrievable representations of shape within the scene. Therefore, shape reconstruction from radar typically relies on applying post-processing computer vision techniques, originally designed for optical images, to radar imaging products. Shape reconstruction directly from raw data would be desirable in many applications, e.g. in computer vision and robotics. In this perspective, inversion seems an attractive approach. Nevertheless, inversion has seldom been attempted in the radar context, as high frequency signals lead to energy functionals dominated by tightly packed narrow local minima. In this paper, we take the first step in developing a framework in which radar signals and images can be jointly used for shape reconstruction. In particular, we investigate the feasibility of shape reconstruction by inversion of pulse-compressed radar signals alone, collected at sparse locations. Motivated by geometric methods that have matured within the fields of image processing and computer vision, we pose the problem in a variational context obtaining a partial differential equation for the evolution of an initial shape towards the shape-reflectivity combination that best reproduces the data. While doing so, we highlight several non-obvious difficulties encountered and discuss how to surpass them. We illustrate the potential of this approach through three simulated examples and discuss several implementation choices, including boundary conditions, reflectivity estimation, and radiative models. The success of our simulations shows that this variational approach can naturally accommodate radar inversion and has the potential for further expansion towards active surfaces and level set applications, where we believe it will naturally complement current applications with optical images.
The electron-phonon coupling constant, Fermi temperature and unconventional superconductivity in the carbonaceous sulfur hydride 190 K superconductor
Authors: Talantsev E F
Published: December 2020

Recently, Snider et al (2020 Nature
586 373) reported on the observation of superconductivity in highly compressed carbonaceous sulfur hydride, H
x
(S,C)
y
. The highest critical temperature in H
x
(S,C)
y
exceeds the previous record of T
c = 280 K by 5 K, as reported by Somayazulu et al (2019 Phys. Rev. Lett.
122 027001) for highly compressed LaH10. In this paper, we analyze experimental temperature-dependent magnetoresistance data, R(T,B), reported by Snider et al. The analysis shows that H
x
(S,C)
y
compound exhibited T
c = 190 K (P = 210 GPa), has the electron–phonon coupling constant λ
e−ph = 2.0 and the ratio of critical temperature, T
c, to the Fermi temperature, T
F, in the range of 0.011 ⩽ T
c/T
F ⩽ 0.018. These deduced values are very close to the ones reported for H3S at P = 155–165 GPa (Drozdov et al 2015 Nature
525 73). This means that in all considered scenarios the carbonaceous sulfur hydride 190 K superconductor falls into the unconventional superconductor band in the Uemura plot, where all other highly compressed super-hydride/deuterides are located. It should be noted that our analysis shows that all raw R(T,B) data sets for H
x
(S,C)
y
samples, for which Snider et al (2020 Nature
586 373) reported T
c > 200 K, cannot be characterized as reliable data sources. Thus, independent experimental confirmation/disproof for high-T
c values in the carbonaceous sulfur hydride are required.
Phase diagram, stability and magnetic properties of nonlinear excitations in spinor Bose–Einstein condensates
Authors: Katsimiga G C , Mistakidis S I , Schmelcher P , Kevrekidis P G
Published: December 2020

We present the phase diagram, the underlying stability and magnetic properties as well as the dynamics of nonlinear solitary wave excitations arising in the distinct phases of a harmonically confined spinor F = 1 Bose–Einstein condensate. Particularly, it is found that nonlinear excitations in the form of dark–dark–bright solitons exist in the antiferromagnetic and in the easy-axis phase of a spinor gas, being generally unstable in the former while possessing stability intervals in the latter phase. Dark–bright–bright solitons can be realized in the polar and the easy-plane phases as unstable and stable configurations respectively; the latter phase can also feature stable dark–dark–dark solitons. Importantly, the persistence of these types of states upon transitioning, by means of tuning the quadratic Zeeman coefficient from one phase to the other is unravelled. Additionally, the spin-mixing dynamics of stable and unstable matter waves is analyzed, revealing among others the coherent evolution of magnetic dark–bright, nematic dark–bright–bright and dark–dark–dark solitons. Moreover, for the unstable cases unmagnetized or magnetic droplet-like configurations and spin-waves consisting of regular and magnetic solitons are seen to dynamically emerge remaining thereafter robust while propagating for extremely large evolution times. Interestingly, exposing spinorial solitons to finite temperatures, their anti-damping in trap oscillation is showcased. It is found that the latter is suppressed for stronger bright soliton component ‘fillings’. Our investigations pave the wave for a systematic production and analysis involving spin transfer processes of such waveforms which have been recently realized in ultracold experiments.
Non-local correlation between two coupled qubits interacting nonlinearly with a two-mode cavity: Bell function, Trace norm and Bures distance quantifiers
Authors: Mohamed A-B A , Khalil E M , Abdel-Khalek S
Published: December 2020

In this paper, we study the dynamics of two coupled qubits interacting with a two-mode parametric amplifier cavity through the nonlinear interactions of the photon processes under the intrinsic decoherence. The nonlinear unitary interactions lead to generating different types of nonlocal correlations via Bell nonlocality, trace-norm measurement-induced non-locality (MIN), and Bures-distance entanglement. Based on the intrinsic decoherence, the two-qubit states have stationary amounts of the MIN-correlation and Bures distance entanglement with more stability. It is found that the qubit–qubit interaction coupling is affected as additional decoherence. It leads to more oscillations and stability. The enhancement of the amount of the generated nonlocal correlations depends on the superposition of Barut-Girardello coherent states. The phenomenon of sudden birth/death and the Bell non-locality can be enhanced when the two-mode parametric amplifier cavity is initially prepared in the coherent states.
Device physics and design of FD-SOI JLFET with step-gate-oxide structure to suppress GIDL effect*
Authors: Wang Bin , Shi Xin-Long , Zhang Yun-Feng , Chen Yi , Hu Hui-Yong , Wang Li-Ming
Published: December 2020

A novel n-type junctionless field-effect transistor (JLFET) with a step-gate-oxide (SGO) structure is proposed to suppress the gate-induced drain leakage (GIDL) effect and off-state current I
off. Introducing a 6-nm-thick tunnel-gate-oxide and maintaining 3-nm-thick control-gate-oxide, lateral band-to-band tunneling (L-BTBT) width is enlarged and its tunneling probability is reduced at the channel--drain surface, leading the off-state current I
off to decrease finally. Also, the thicker tunnel-gate-oxide can reduce the influence on the total gate capacitance of JLFET, which could alleviate the capacitive load of the transistor in the circuit applications. Sentaurus simulation shows that I
off of the new optimized JLFET reduced significantly with little impaction on its on-state current I
on and threshold voltage V
TH becoming less, thus showing an improved I
on/I
off ratio (5 × 104) and subthreshold swing (84 mV/dec), compared with the scenario of the normal JLFET. The influence of the thickness and length of SGO structure on the performance of JLFET are discussed in detail, which could provide useful instruction for the device design.
Improved nonlinear parabolized stability equations approach for hypersonic boundary layers*
Authors: Ma Shaoxian , Duan Yi , Huang Zhangfeng , Yao Shiyong
Published: December 2020

The nonlinear parabolized stability equations (NPSEs) approach is widely used to study the evolution of disturbances in hypersonic boundary layers owing to its high computational efficiency. However, divergence of the NPSEs will occur when disturbances imposed at the inlet no longer play a leading role or when the nonlinear effect becomes very strong. Two major improvements are proposed here to deal with the divergence of the NPSEs. First, all disturbances are divided into two types: dominant waves and non-dominant waves. Disturbances imposed at the inlet or playing a leading role are defined as dominant waves, with all others being defined as non-dominant waves. Second, the streamwise wavenumbers of the non-dominant waves are obtained using the phase-locked method, while those of the dominant waves are obtained using an iterative method. Two reference wavenumbers are introduced in the phase-locked method, and methods for calculating them for different numbers of dominant waves are discussed. Direct numerical simulation (DNS) is performed to verify and validate the predictions of the improved NPSEs in a hypersonic boundary layer on an isothermal swept blunt plate. The results from the improved NPSEs approach are in good agreement with those of DNS, whereas the traditional NPSEs approach is subject to divergence, indicating that the improved NPSEs approach exhibits greater robustness.
Gas sensor using gold doped copper oxide nanostructured thin films as modified cladding fiber
Authors: Salloom Hussein T. , Jasim Rushdi I. , Habubi Nadir Fadhil , Chiad Sami Salman , Jadan M , Addasi Jihad S.
Published: December 2020

We investigate the spectral response of nanostructured copper oxides thin film. Gold was doped in two different concentrations (2% and 4%) using the spray method. A novel ammonia gas sensor at various concentrations (0–500 ppm) was fabricated by replacing CuO films with a clad region. In addition, the effect of gold doping on structural, optical, and morphological properties has been demonstrated. The study shows that the spectral intensity increases linearly with ammonia concentration. The 4% Au doped CuO presents higher sensitivity compared with 2% doped and pure copper oxides. Time response characteristics of the sensor are also reported.
Doping effects of transition metals on the superconductivity of (Li,Fe)OHFeSe films*
Authors: Li Dong , Shen Peipei , Ma Sheng , Wei Zhongxu , Yuan Jie , Jin Kui , Yu Li , Zhou Fang , Dong Xiaoli , Zhao Zhongxian
Published: December 2020

The doping effects of transition metals (TMs = Mn, Co, Ni, and Cu) on the superconducting critical parameters are investigated in the films of iron selenide (Li,Fe)OHFeSe. The samples are grown via a matrix-assisted hydrothermal epitaxy method. Among the TMs, the elements of Mn and Co adjacent to Fe are observed to be incorporated into the crystal lattice more easily. It is suggested that the doped TMs mainly occupy the iron sites of the intercalated (Li,Fe)OH layers rather than those of the superconducting FeSe layers. We find that the critical current density J
c can be enhanced much more strongly by the Mn dopant than the other TMs, while the critical temperature T
c is weakly affected by the TM doping.
KNITU-KAI educational cluster: teaching mathematics
Authors: Yakupov Z Ya , Galimova R K , Dorofeeva S I , Nikiforova S V , Valishin N T
Published: December 2020

The system of mathematical education at the A. N. Tupolev Kazan National Research Technical University (KNITU-KAI) is described. It is suggested that the mathematics course at a technical university should be diversified. This should be ensured for different areas by the difference in the selection of material, the placement of emphasis on the relevance of the studied sections of mathematics in the specialized disciplines. It is proposed that the development of interest in mathematics for future engineers can be provided by solving professionally oriented problems, showing the use of mathematical sections using specific examples from the disciplines of the professional cycle, and thus drawing the attention of junior students to the need to have solid mathematical knowledge. The author points out the significant role of online training courses at KNITU-KAI. It is assumed that e-courses allow a deeper study of the material presented by the teacher in lectures and practical classes, and they also provide an opportunity to qualitatively prepare for control activities, for intermediate certification.
Strategy and tactics of teaching mathematics at a technical university
Authors: Vershinina L P , Vershinin M I
Published: December 2020

The role of mathematics in the formation of innovative thinking of students is determined. The strategy and tactics of teaching mathematics in solving the problem of integration of fundamental and professional education are proposed. The role of integrative disciplines as a means of unifying the links between mathematics and special disciplines was revealed. It is shown that the course of mathematics in a technical university should reflect continuously developing trends in applied mathematics. The need to include general mathematical courses in the curricula at all stages of training including in the magistracy is justified. Examples illustrating the proposed concept are given.
Pedagogical conditions for the formation of the students’ scientific worldview when teaching biology
Authors: Kondaurova T I , Fetisova N E , Vedeneev A M , Zverev A V , Reut L A
Published: December 2020

The theoretical aspects are revealed regarding the role of biology as one of the leading sciences of nature, in the formation of the students’ scientific worldview. It is emphasized that the content of the school subject “Biology”, methods, forms and means of study thereof, should be aimed at the formation of the students’ worldview. There are highlighted the main pedagogical conditions of the stepwise formation of the students’ worldview when teaching biology, taking into account the specific kinds of activity of the students and the teacher. As a structural unit of the pedagogical process there are designated the person-developing learning situations based on the relationship between the educational activity and life experience as well as the independent creative activity of the student, for the implementation of which the traditional content and techniques of teaching biology are reconstructed-the biological concepts of the worldview nature, creative tasks, problem situations, worldview-oriented issues with regard to the age-specific features of the students are emphasized. The obtained results of the pedagogical diagnostics, aimed at identifying the level of the formedness of the students’ scientific worldview, confirmed the effectiveness of the chosen pedagogical conditions.
On the issue of the level of estimation for professional mobility of the future expert in the field of operating security
Authors: Brukhov E N , Kovtunenko L V , Kalach E V , Melnik O E
Published: December 2020

The article discusses the most important problem associated with the formation of professional mobility of future specialists in the field of life safety in educational institutions of the Ministry of Emergencies based on modular training. The modern social and economic situation actualizes the personality professional educational problem, the initiatives and competent, corporate, professional and mobile preparation in higher school. The authors, based on indicators of the formation of professional mobility and psychodiagnostic techniques that allow us to assess the level of formation of each of the selected indicators, identified and substantively characterized the levels of formation of professional mobility of cadets-future employees of the Ministry of Emergencies: partial, potential, updated.
Training of teachers for engineering education in Russian schools
Authors: Gromova E M , Berkutova D I , Gorshkova T A
Published: December 2020

For the scientific and technological development of the Russian Federation, it is necessary to train personnel since school days. With this approach to engineering education, the training of highly qualified teachers becomes especially relevant. These “technology teachers of the XXI century” should not only be motivated to work with students, but also demonstrate modern digital, engineering and technological competencies. The following research methods were used: analysis of scientific papers on the problems of engineering education in schools; the concept of teaching the subject area "Technology" in Russian schools that implement the main general education programs, the latest educational and methodological complexes for technology; analysis of the legal framework and systematization of the leading normative documents determining changes in the professional and pedagogical education of technology teachers; analysis and generalization of the author’s experience in the development of basic professional educational programs; pedagogical experience in training future technology and informatics teachers, as well as experience in teaching technology to schoolchildren; analysis of the impact of digitalization of education and professional activity on the transformation of the ways of their implementation, as well as the processes of interpersonal interaction and professional identification; diagnostics according to L. B. Schneider "Professional Identity", questionnaires and descriptive statistics; generalization and interpretation of research results. A detailed analysis of psychological and pedagogical research, regulatory documentation in the field of technology education allowed the authors to identify the main conditions for the training of technology teachers for the implementation of engineering education in secondary schools in Russia.
The system of mathematical education of Russia: problems, tasks, solutions
Authors: Belov F D , Smirnova A V
Published: December 2020

The article presents a study of the currently functioning system of mathematical education in the Russian Federation. The importance of research areas related to mathematics for the Russian and world community has been substantiated. The analysis of the implementation of the modern Concept of Mathematical Education of the Russian Federation is carried out, achievements and problems are highlighted. The changes that have affected school and university mathematics education from the moment of approval of the Concept of Mathematical Education of the Russian Federation and up to the present, the positive and negative results of these changes are shown. On the basis of a survey conducted by the authors of representatives of the leading mathematical organizations of Russia for the changes necessary from their point of view that need to be introduced into the Concept of Mathematical Education, the most important and significant proposals for improving the quality of this sphere of education have been developed.
Assessment of the application of the Universal Competencies
Authors: Masaev S N , Dorrer G A , Minkin A N , Bogdanov A V , Salal Y K
Published: December 2020

Application of Universal Competencies in Russian educational institutions is very important. Based on them, educational standards are invented. However, there is no universal assessment of the application of the Universal Competencies in practice. The main idea of the research is a general assessment of the application of universal competencies. For this, the activity of the enterprise is modeled. The enterprise process model is combined with the Universal Competencies. Further, the measurement is made by a universal indicator. The analysis of the dynamics of the universal indicator proves the existence of an assessment of the application of the Universal Competencies at a production facility. The integral indicator is a universal assessment of the application of the Universal Competencies.
The automated system Steach. Space designed for Programming teaching
Authors: Kizyanov A , Luchaninov D , Bazhenov R , Pronin A , Tabachuk N , Samorukov A
Published: December 2020

The research aims at designing and verifying an automated system for online learning in Programming languages. Such systems were designed to provide students’ independent theoretical training and exercising within in-person learning and are able to operate on their own. Nginx, Docker, Gunicorn, Django, Python, PostgreSQL, HTML5, and CSS Framework were applied. Testing was held at Sholom-Aleichem Priamursky State University and Pacific National University in the 2019-2020 academic year. Training in C++ and Python was arranged for 30 students for the research efficiency checking. The researchers found out the system used could make Programming learning more efficient. The results showed that it was improved by 30% in an experimental group and by 17% in a control group. The survey data used defined that the participants of the experiment (students, lecturers, experts) appreciated the software solution. The designed system Steach.space has a user-friendly interface, contains modules for developing integrated/built-in courses, providing teaching aids and tests, computer-assisted verification of assignments in Programming, and observing statistics/history on student learning. The software can be used for teaching programming languages, as well as other subject domains.