bluuebunny/crossref_metadata_2025 huggingface dataset:
Complimentary action of structured and unstructured domains of epsin supports clathrin-mediated endocytosis at high tension
Authors: Joseph Jophin G. , Osorio Carlos , Yee Vivian , Agrawal Ashutosh , Liu Allen P.
Published: December 2020

Membrane tension plays an inhibitory role in clathrin-mediated endocytosis (CME) by impeding the transition of flat plasma membrane to hemispherical clathrin-coated structures (CCSs). Membrane tension also impedes the transition of hemispherical domes to omega-shaped CCSs. However, CME is not completely halted in cells under high tension conditions. Here we find that epsin, a membrane bending protein which inserts its N-terminus H0 helix into lipid bilayer, supports flat-to-dome transition of a CCS and stabilizes its curvature at high tension. This discovery is supported by molecular dynamic simulation of the epsin N-terminal homology (ENTH) domain that becomes more structured when embedded in a lipid bilayer. In addition, epsin has an intrinsically disordered protein (IDP) C-terminus domain which induces membrane curvature via steric repulsion. Insertion of H0 helix into lipid bilayer is not sufficient for stable epsin recruitment. Epsin’s binding to adaptor protein 2 and clathrin is critical for epsin’s association with CCSs under high tension conditions, supporting the importance of multivalent interactions in CCSs. Together, our results support a model where the ENTH and unstructured IDP region of epsin have complementary roles to ensure CME initiation and CCS maturation are unimpeded under high tension environments.
Dependency of solvation effects on metal identity in surface reactions
Authors: Zare Mehdi , Saleheen Mohammad , Kundu Subrata Kumar , Heyden Andreas
Published: December 2020

Solvent interactions with adsorbed moieties involved in surface reactions are often believed to be similar for different metal surfaces. However, solvents alter the electronic structures of surface atoms, which in turn affects their interaction with adsorbed moieties. To reveal the importance of metal identity on aqueous solvent effects in heterogeneous catalysis, we studied solvent effects on the activation free energies of the O–H and C–H bond cleavages of ethylene glycol over the (111) facet of six transition metals (Ni, Pd, Pt, Cu, Ag, Au) using an explicit solvation approach based on a hybrid quantum mechanical/molecular mechanical (QM/MM) description of the potential energy surface. A significant metal dependence on aqueous solvation effects was observed that suggests solvation effects must be studied in detail for every reaction system. The main reason for this dependence could be traced back to a different amount of charge-transfer between the adsorbed moieties and metals in the reactant and transition states for the different metal surfaces.
Forensic analysis of hand-written documents using laser-induced breakdown spectroscopy (LIBS) and chemometrics
Authors: Hilario Felipe Ferri , Lima de Mello Matheus , Pereira-Filho Edenir Rodrigues
Published: December 2020

With the use of Laser Induced Breakdown Spectroscopy (LIBS), fast and semi non-destructive elemental analysis of ball-point pen writings has been performed directly from paper surfaces, aiming to obtain maximum differentiation between pens with a minimum number of pulses.
Strategies to expand peptide functionality through hybridisation with a small molecule component
Authors: Wu Yuteng , Williams Jack , Calder Ewen D. D. , Walport Louise J.
Published: December 2020

This review details discovery strategies and established applications of peptide-small molecule hybrids, classified by the added functionality imparted by the small molecule component.
Copper-catalyzed enantioselective synthesis of bridged bicyclic ketals from 1,1-disubstituted-4-methylene-1,6-hexanediols and related alkenols
Authors: Burde Ameya S. , Karyakarte Shuklendu D. , Sylvester Eric D. , Chemler Sherry R.
Published: December 2020

Bicyclic ketals via copper-catalyzed enantioselective bis(cyclization) involving radical group transfer is disclosed.
Fabrication of GdxFeyOz films using an atomic layer deposition-type approach
Authors: Yu Pengmei , Beer Sebastian M. J. , Devi Anjana , Coll Mariona
Published: December 2020

The growth of complex oxide thin films with atomic precision offers bright prospects to study improved properties and novel functionalities.
Electrochemical growth of dendritic silver nanostructures as facile SERS substrates
Authors: Usman Amin Muhammad , Zhang Lingling , Hao Rui , Zhang Dongjie , You Hongjun , Fang Jixiang
Published: December 2020

The well-defined silver dendritic nanostructure with a precisely tailored trunk and branches, as well as decorated nanoparticles.
A force field for bio-polymers in ionic liquids (BILFF) – part 1: [EMIm][OAc]/water mixtures
Authors: Roos Eliane , Brehm Martin
Published: December 2020

We present BILFF, a force field for bio-polymers in ionic liquids, optimized to accurately describe hydrogen bonds. In the first part, we introduce force field parameters for mixtures of 1-ethyl-3-methylimidazolium acetate ([EMIm][OAc]) with water.
High volatility of superbase-derived eutectic solvents used for CO2 capture
Authors: Chen Yu , Hu Xiaohong , Chen Wenjun , Liu Chong , Qiao Kepan , Zhu Meijing , Lou Yanyan , Mu Tiancheng
Published: December 2020

Green eutectic solvents are found to be highly volatile at room temperature and atmospheric pressure.
Photoelectrochemical hydrogen evolution using CdTexS1−x quantum dots as sensitizers on NiO photocathodes
Authors: Benazzi Elisabetta , Cristino Vito , Boaretto Rita , Caramori Stefano , Natali Mirco
Published: December 2020

Stable photocurrents (up to ∼1 h) are obtained using CdTexS1−x QDs on NiO photocathodes with molecular Ni(ii) or metallic Pt HECs.
Fast and high-yield synthesis of thiolate Ag44 and Au12Ag32 nanoclusters via the CTAB reverse micelle method
Authors: Qin Lubing , Zhang Feng , Ma Xiaoshuang , Tang Yun , Ma Guanyu , Tang Zhenghua
Published: December 2020

Fast and high-yield synthesis of Ag44 and Au12Ag32 nanoclusters is realized by the reverse micelle method and the mechanism is elucidated.
Cr,Yb-codoped Ca2LaHf2Al3O12garnet phosphor: electronic structure, broadband NIR emission and energy transfer properties
Authors: Huang Dayu , Ouyang Qiuyun , Xiao Hui , Wang Bo , Lian Hongzhou , Zeng Qingguang , Lin Jun
Published: December 2020

Broadband NIR emission of a Ca2LaHf2Al3O12:Cr3+,Yb3+phosphor has potential application as a light source for food content analysis.
Hierarchical structures lead to high thermoelectric performance in Cum+nPb100SbmTe100Se2m (CLAST)
Authors: Wang Siqi , Xiao Yu , Chen Yongjin , Peng Shang , Wang Dongyang , Hong Tao , Yang Zhi , Sun Yuejun , Gao Xiang , Zhao Li-Dong
Published: December 2020

Hierarchical microstructures lead to high thermoelectric performance in Cum+nPb100SbmTe100Se2m (CLAST) through synergistically optimizing carrier and phonon transport.
Reduction of silver ions to form silver nanoparticles by redox-active organic molecules: coupled impact of the redox state and environmental factors
Authors: Dong Feng , Wu Chao , Miao Ai-Jun , Pan Ke
Published: December 2020

Silver ions are directly reduced by reduced-organics to form AgNPs, and UV light radiation enables Ag+ reduction by oxidized-organics.
Emerging investigator series: 3D printed graphene-biopolymer aerogels for water contaminant removal: a proof of concept
Authors: Masud Arvid , Zhou Chi , Aich Nirupam
Published: December 2020

3D printed fit-for-design graphene-biopolymer aerogel for adsorption and/or filtration of contaminants from water.
Characterization of the potential reference material SA02 for micro-beam U–Pb geochronology and Hf–O isotopic composition analysis of zircon
Authors: Huang Chao , Wang Hao , Yang Jinhui , Yang Chuan , Li Zhenxin , Yang Yueheng , Feng Lianjun , Xie Liewen , Wu Shitou
Published: December 2020

In the present work, a natural zircon megacryst SA02 (exact provenance unknown) is investigated as a new potential reference material for U–Pb geochronology and Hf–O isotopic composition analysisviamicro-beam methods.
Tunnel dielectrophoresis for ultra-high precision size-based cell separation
Authors: Kung Yu-Chun , Niazi Kayvan R. , Chiou Pei-Yu
Published: December 2020

In this study, we present a microfluidic device that can achieve label-free and size-based cell separation with high size differential resolution for arbitrary cell size band filtering.
Influence of counter ions of ammonium for nitrogen doping and carbon properties in hydrothermal carbonization: characterization and supercapacitor performance
Authors: Latham Kenneth G. , Forghani Marveh , Dose Wesley M. , Allen Jessica A. , Donne Scott W.
Published: December 2020

The ammonium counter ion is shown to influence the morphology, physicochemical properties and electrochemical performance of hydrothermal carbon.
Chemisorption of CO2on diaminated silica as bicarbonates and different types of carbamate ammonium ion pairs
Authors: Szego Anthony E. , Jaworski Aleksander , Hedin Niklas
Published: December 2020

Direct excitation and {1H}13C-CPMAS NMR allowed detecting carbamate–ammonium ion pairs, carbamic acid and bicarbonate species in amine-modified silica sorbents.
Rare-earth quantum cutting in metal halide perovskites – a review
Authors: Ferro Silvia M. , Wobben Merlinde , Ehrler Bruno
Published: December 2020

Ytterbium-doped lead halide perovskite (Yb3+:CsPbX3 with x = Cl or Cl/Br) nanocrystals and thin films have shown surprisingly efficient downconversion by quantum cutting with PLQYs up to 193%.
Spin-constrained optoelectronic functionality in two-dimensional ferromagnetic semiconductor heterojunctions
Authors: Guo Yilv , Zhang Yehui , Zhou Zhaobo , Zhang Xiwen , Wang Bing , Yuan Shijun , Dong Shuai , Wang Jinlan
Published: December 2020

A new type of spin-constrained optoelectronic device model implemented using 2D ferromagnetic semiconductor heterostructures is proposed, which utilizes the coupling between the interlayer magnetic orientation and the spin-polarized band structure.
Half-Dirac semimetals and the quantum anomalous Hall effect in Kagome Cd2N3 lattices
Authors: Li Xin-Yang , Ji Wei-Xiao , Wang Pei-Ji , Zhang Chang-Wen
Published: December 2020

Half-Dirac semimetals, which possess 100% spin-polarizations for Dirac materials, are desirable for exploring topological phase of matter as low-dimensionality opens opportunities for manipulating the quantum state of low-cost electronic nanodevices.
An all-inorganic, fully dense, stretchable ceramic magnetic film
Authors: Liu Muchun , Qian Lijuan , Yu Chao , Xiao Gang , Hurt Robert H.
Published: December 2020

An all-Inorganic, fully dense, stretchable cobalt ferrite magnetic film using colloidal engineering and textured graphene templating.
Technology progress on quantum dot light-emitting diodes for next-generation displays
Authors: Bang Sang Yun , Suh Yo-Han , Fan Xiang-Bing , Shin Dong-Wook , Lee Sanghyo , Choi Hyung Woo , Lee Tae Hoon , Yang Jiajie , Zhan Shijie , Harden-Chaters William , Samarakoon Chatura , Occhipinti Luigi G. , Han Soo Deok , Jung Sung-Min , Kim Jong Min
Published: December 2020

This article focuses on state-of-the-art technologies used in the research on materials, devices and processes to achieve high-performance QD-LEDs.
The synthesis of a novel pentoxifylline derivative with superior human sperm motility enhancement properties
Authors: Kumari Sandhya , Kotyan Sukumar , Sugunan Sinoy , Rajanikant G. K. , Kumar Kothanahally S. Sharath , Adiga Satish Kumar , Dasappa Jagadeesh Prasad , Kalthur Guruprasad
Published: December 2020

mPTF1 demonstrated lower genotoxicity, higher affinity for PDEs, & reasonable pharmacokinetic, druglikeness & ADMET properties compared to Pentoxifylline.
The use of MM/QM calculations of 13C chemical shifts in the conformational analysis of some monosaccharides and sucrose
Authors: Abraham Raymond J. , Cooper M. Ashley , Reid Matthew
Published: December 2020

The 13C NMR chemical shifts of some common pyranose monosaccharides in D2O solution were predicted using a combined molecular mechanics (Pcmod 9.1/MMFF94) and ab initio (GIAO (B3LYP/DFT, 6-31G(d))) model.
Intercalation of a manganese(ii)-thiacalixarene luminescent complex in layered double hydroxides: synthesis and photophysical characterization
Authors: O’Toole Niall , Lecourt Constance , Suffren Yan , Toche François , Chiriac Rodica , Gilon Nicole , Bessueille François , Brioude Arnaud , Jeanneau Erwann , Luneau Dominique , Desroches Cédric
Published: December 2020

The luminescent complex [(ThiaSO2)2(MnII)4F]− (ThiaSO2 = p-tert-butylsulfonylcalixarene) was introduced between layered double hydroxides. The material displays a very high sensitivity to its luminescence emission with oxygen.
Alkoxycyanoborates: metal salts and low-viscosity ionic liquids
Authors: Schopper Nils , Sprenger Jan A. P. , Zapf Ludwig , Reiss Guido J. , Ignat’ev Nikolai V. , Finze Maik
Published: December 2020

Alkoxycyanoborates including low-viscosity ionic liquids which are promising materials in particular for electrochemical applications and Li[CH3OB(CN)3], which is a potential conducting salt, are presented.
Reversible dissociation of singly-bonded (C60−)2 dimers in (MV˙+)2(C60−)2·solvent salt containing paramagnetic methyl viologen MV˙+ radical cations
Authors: Konarev Dmitri V. , Khasanov Salavat S. , Obraztsov Oleg A. , Otsuka Akihiro , Yamochi Hideki , Kitagawa Hiroshi , Lyubovskaya Rimma N.
Published: December 2020

Interaction of MV0 with C60 produces salt (MV˙+)2(C60−)2⋅solvent (1) containing singly-bonded (C60−)2 dimers dissociated at 235–375 K. There is exchange interaction between MV˙+ and C60˙− in the monomeric phase which is switched off in the dimeric phase.
Structural characterization and QSAR modeling of 1,2,4-triazole derivatives as α-glucosidase inhibitors
Authors: Dahmani Rahma , Manachou Marwa , Belaidi Salah , Chtita Samir , Boughdiri Salima
Published: December 2020

In order to identify potential new drugs classified as alpha-Glucosidase inhibitors (AGIs), we used quantum chemical descriptors and QSAR modeling to predict the biological activity of triazole derivatives as AGIs.
Fingerprinting branches on supercoiled plasmid DNA using quartz nanocapillaries
Authors: Maheshwaram Sumanth Kumar , Sreenivasa Koushik , Soni Gautam Vivek
Published: December 2020

We show detailed understanding of enzyme dependent structural changes in supercoiled DNA along with a quantitative analysis of its branches using nanopores.
Phase change material based hot electron photodetection
Authors: Chamoli Sandeep Kumar , Verma Gopal , Singh Subhash C. , Guo Chunlei
Published: December 2020

We introduce a phase change material (PCM) based metal–dielectric–metal (MDM) cavity of gold (Au)–antimony trisulfide (Sb2S3)–Au as a hot electron photodetector (HEPD).
Conjugated nanomaterials for solar fuel production
Authors: Aitchison Catherine M. , Sprick Reiner Sebastian
Published: December 2020

Photocatalytic hydrogen production from water has the potential to fulfil future energy needs by producing a clean and storable fuel. Here the discuss the recent advances in using nanosized materials as photocatalysts.
Structural evolution of two-dimensional silicates using a “bond-switching” algorithm
Authors: Boscoboinik Alejandro M. , Manzi Sergio J. , Pereyra Víctor D. , Mas Walter L. , Boscoboinik Jorge Anibal
Published: December 2020

Ring size distribution in silicate bilayers obtained from Monte Carlo simulations using a bond-switching algorithm (compared to experimental data) when a temperature gradient is introduced to mimic a crystalline to vitreous domain boundary.
Facile synthesis of 1,4-oxazines by ruthenium-catalyzed tandem N–H insertion/cyclization of α-arylamino ketones and diazo pyruvates
Authors: Sajjad Farrukh , Chen Yanmei , Tian Xue , Dong Suzhen , Gopi Krishna Reddy Alavala , Hu Wenhao , Xing Dong
Published: December 2020

A RuCl3-catalyzed tandem N–H insertion/cyclization sequence from simple α-amino ketones and diazo pyruvates is realized, resulting a series of substituted 1,4-oxazines that show promising anticancer activities toward HCT116.
A shish-kebab-like supramolecular polymer and its light-responsive self-assembly into nanofibers
Authors: Chen ChuanShuang , Huang Pei , Pan Hui , Qi Meiwei , Xu Qingsong , Dai Haojie , Ji Yi , Wang Yuling , Yu Chunyang , Zhou YongFeng
Published: December 2020

We report a shish-kebab-like supramolecular polymer (SKSP) and its light-responsive self-assembly into nanofibers.
Sequence-regulated vinyl polymers via iterative atom transfer radical additions and acyclic diene metathesis polymerization
Authors: Miyajima Masato , Satoh Kotaro , Kamigaito Masami
Published: December 2020

Iterative ATRAs and ADMET polymerization enabled the synthesis of sequence-regulated vinyl polymers without statistical distribution of monomer compositions and sequences.
Physical supercritical fluid deposition of polymer films: controlling the crystallinity with pressure
Authors: Yousefi Nastaran , Saeedi Saghez Behrad , Pettipas Richard D. , Kelly Timothy L. , Kaake Loren G.
Published: December 2020

The self-assembly of isotactic polypropylene films from supercritical n-pentane was studied. The effects of solution thermodynamics and fluid mechanics were reported.
Infrared-photostimulable and long-persistent ultraviolet-emitting phosphor LiLuGeO4:Bi3+,Yb3+ for biophotonic applications
Authors: Cai Hao , Song Zhen , Liu Quanlin
Published: December 2020

A long-persistent ultraviolet-emitting phosphor LiLuGeO4:Bi3+,Yb3+ is synthesized. This phosphor exhibits simulated in vivo photostimulated persistent luminescence after a longtime decay by using in vitro NIR light penetrating biological tissue.
Supramolecular nanoparticles constructed from pillar[5]arene-based host–guest complexation with enhanced aggregation-induced emission for imaging-guided drug delivery
Authors: Liu Dahai , Du Jianshi , Qi Shaolong , Li Mengyao , Wang Jianfeng , Liu Meihan , Du Xianlong , Wang Xinyu , Ren Bichen , Wu Dan , Shen Jie
Published: December 2020

Supramolecular nanoparticles with enhanced aggregation-induced emission are prepared by taking advantage of pillar[5]arene-based host–guest complexation, and are sophisticated nanocarriers for imaging-guided drug delivery.
A life cycle approach to solvent design: challenges and opportunities for ionic liquids – application to CO2 capture
Authors: Cuéllar-Franca Rosa M. , García-Gutiérrez Pelayo , Hallett Jason P. , Mac Dowell Niall
Published: December 2020

CO2 capture and storage is widely anticipated to play a key role in combatting climate change, however the solvents proposed for use have embedded environmental concerns.
Synthesis of 2-oxoglutarate derivatives and their evaluation as cosubstrates and inhibitors of human aspartate/asparagine-β-hydroxylase
Authors: Brewitz Lennart , Nakashima Yu , Schofield Christopher J.
Published: December 2020

Efficient synthesis of 2-oxoglutarate derivatives enables identification of inhibitors and novel cosubstrates of human aspartate/asparagine-β-hydroxylase as revealed by spectroscopic and crystallographic studies.
Ultrafast structural dynamics of in-cage isomerization of diiodomethane in solution
Authors: Kim Hanui , Kim Jong Goo , Kim Tae Wu , Lee Sang Jin , Nozawa Shunsuke , Adachi Shin-ichi , Yoon Kihwan , Kim Joonghan , Ihee Hyotcherl
Published: December 2020

The structural dynamics of in-cage isomerization of CH2I2 and the unusual structure of the loosely-bound isomer precursor were unveiled with femtosecond X-ray liquidography (solution scattering).
Molecular engineering enabling reversible transformation between helical and planar conformations by cyclization of alkynes
Authors: Yan Lipeng , Ma Weixin , Lan Jingbo , Cheng Hu , Bin Zhengyang , Wu Di , You Jingsong
Published: December 2020

One-pot synthesis of aza[4]helicenes is accomplished through two successive C–H activation/cyclizations, which exhibit on/off fluorescence switching through reversible transformation between helical and planar conformations.
Language Differentiation Using Augmentative and Alternative Communication: An Investigation of Spanish–English Bilingual Children With and Without Language Impairments
Authors: King Marika R. , Romski MaryAnn , Sevcik Rose A.
Published: December 2020

Purpose

Children with severe speech and language impairments growing up in dual language environments may communicate in more than one language using augmentative and alternative communication (AAC). This study investigated predictors of bilingual children's ability to differentiate between Spanish and English using an AAC iPad app during a cued language-switching task and examined whether switching between languages using AAC incurred a cognitive cost.

Method

Participants were 58 Spanish–English bilingual children ages 4;0–6;11 (years;months; 23 with language impairments). Children received standardized language and cognitive assessments and completed an experimental language-switching task in which they were asked to differentiate between languages using an AAC iPad app containing English and Spanish vocabulary layouts paired with voice output.

Results

Results of a binary logistic regression indicated that, when controlling for age, processing speed significantly predicted whether children were classified as high or low performers on the experimental task. Nonparametric tests indicated that switching between languages did not incur a cognitive cost as evidenced by similar response times on trials where participants were required to switch between languages compared to trials where they did not switch.

Conclusion

This study contributes to the understanding of how young bilingual children with and without language impairments conceptualize and discriminate between languages represented in a visual–graphic modality paired with speech output.

Supplemental Material

https://doi.org/10.23641/asha.13289330
Fixed‐time orientation estimation and network localisation of multi‐agent systems
Authors: John Younghun , Oh Kwang‐Kyo , Fidan Bariş , Ahn Hyo‐Sung
Published: December 2020

Among different distributed network localisation methods, displacement‐based network localisation with orientation estimation is an effective approach because it does not require global information and yet asymptotically produces accurate estimates. In this paper, to improve transient performance of this approach, non‐linear laws to achieve fixed‐time orientation estimation and fixed‐time displacement‐based localisation are proposed. A sequential algorithm ensuring fixed‐time convergence property and show uniform asymptotic stability of a fixed‐time network localisation with simultaneous fixed‐time orientation estimation is further provided. Simulation results verify that the proposed laws achieve network localisation of multi‐agent systems within fixed settling time.
Stable thin‐wire model of buried pipe‐type power distribution cables for 3D FDTD transient simulation
Authors: Li Binghao , Ding Yuxuan , Du Yaping , Chen Mingli
Published: December 2020

Underground cables such as pipe‐type cables are widely used in urban power industry. In this study, an advanced thin‐wire model of the pipe‐type cables is 3D FDTD simulations. In this model, the multi‐conductor cables are represented with two‐level transmission line equations. A stabilising technique with a 1D spatial low‐pass filter is proposed to maintain computational stability. Frequency‐dependent losses are fully considered by using a vector‐fitting technique. The proposed thin‐wire model is validated with the multi‐conductor transmission line theory analytically and the traditional FDTD method numerically. Good agreements are observed. It is found that the simulation maintains stability for 360,000‐time steps. Compared to the traditional FDTD method, the memory space and computation time of the proposed model can be reduced by 73% and 98%, respectively. Induced lightning currents in a cable connection station are analysed. It is found that, without considering soil ionisation and soil stratification, the peak current in the metallic armour is 1.54 times as much as the one with considering these non‐linear effects. It can be reduced by 9.04% and 18.6% if the cable is buried at depths of 1 m and 1.5 m, compared with the case of a 0.5 m buried depth.
Fuzzy based iterative matting technique for underwater images
Authors: Amin Benish , Riaz M Mohsin , Ghafoor Abdul
Published: December 2020

The paper presents an iterative matting technique for extraction of underwater objects from images. The technique adopts histogram division and stretching to obtain multiple images of different contrast levels that exhibit all image details. For each contrast image, alpha matte is produced and is further refined with every iteration. In the end, fuzzy weights are assigned to the alpha mattes obtained at different contrast levels that are combined using weighted average. The resultant alpha matte thus includes more accurate pixels from multiple alpha mattes and generates much refined matte image. The proposed technique is tested, visually and quantitatively, on a manual dataset containing 50 images. The less MSE shows that the proposed technique achieves noticeably higher accuracy as compared with contemporary image matting techniques.
Performance analysis of a directly modulated semiconductor optical amplifiers using non‐return‐to‐zero, duobinary and quaternary pulse amplitude modulation signalling
Authors: Gutiérrez‐Castrejón Ramón , Fernández‐Segura Osvaldo , Torres‐Ferrera Pablo , Ceballos‐Herrera Daniel Enrique
Published: December 2020

Numerical investigation was done for the response of two semiconductor optical amplifiers (SOA) to direct modulation using three of the most commonly employed intensity modulation formats: non‐return‐to‐zero (NRZ), duobinary (DB) and quaternary pulse amplitude modulation (PAM‐4). It was shown that an optimized SOA not only delivers an average optical power of 18 dBm, but can also be modulated at 25.4, 28.0 and 29.3 Gb/s with the aforementioned formats, respectively. No optical or electronic assistance is considered. The use of spectral‐efficient PAM‐4 thus leads to an improvement of almost 4 Gb/s with respect to NRZ. Slightly faster modulation is reached by operating the SOA deeper into saturation. These figures fall to 12.8, 15.0 and 16.3 Gb/s after 20 km conventional single‐mode fibre propagation in C‐band. Calculation of 10 Gb/s back‐to‐back sensitivities at the low‐density parity‐check forward error correction bit‐error ratio (BER) threshold of 1×10−2 resulted in −24.5, −20.5 and −20.0 dBm for NRZ, DB and PAM‐4 modulations, with a 50 km transmission penalty lower than 3 dB for PAM‐4. This enables the use of directly modulated SOAs as transmitter alternative in high‐loss access networks, such as super‐passive optical networks, provided that further technical improvements can be performed to meet its challenging loss budget.
Velocity correction for Hubble constant measurements from standard sirens
Authors: Mukherjee Suvodip , Lavaux Guilhem , Bouchet François R. , Jasche Jens , Wandelt Benjamin D. , Nissanke Samaya , Leclercq Florent , Hotokezaka Kenta
Published: December 2020

Gravitational wave (GW) sources are an excellent probe of the luminosity distance and offer a novel measure of the Hubble constant,H0. This estimation ofH0from standard sirens requires an accurate estimation of the cosmological redshift of the host galaxy of the GW source after correcting for its peculiar velocity. The absence of an accurate peculiar velocity correction affects both the precision and accuracy of the measurement ofH0, particularly for nearby sources. Here, we propose a framework to incorporate such a peculiar velocity correction for GW sources. A first implementation of our method to the event GW170817, combined with observations taken with Very Large Baseline Interferometry (VLBI), leads to a revised value ofH0= 68.3−4.5+4.6km s−1Mpc−1. While this revision is minor, it demonstrates that our method makes it possible to obtain unbiased and accurate measurements ofH0at the precision required for the standard siren cosmology.
Horizontal shear instabilities in rotating stellar radiation zones
Authors: Park J. , Prat V. , Mathis S. , Bugnet L.
Published: December 2020

Context. Stellar interiors are the seat of efficient transport of angular momentum all along their evolution. In this context, understanding the dependence of the turbulent transport triggered by the instabilities of the vertical and horizontal shears of the differential rotation in stellar radiation zones as a function of their rotation, stratification, and thermal diffusivity is mandatory. Indeed, it constitutes one of the cornerstones of the rotational transport and mixing theory, which is implemented in stellar evolution codes to predict the rotational and chemical evolutions of stars.

Aims. We investigate horizontal shear instabilities in rotating stellar radiation zones by considering the full Coriolis acceleration with both the dimensionless horizontal Coriolis component f̃ and the vertical component f.

Methods. We performed a linear stability analysis using linearized equations derived from the Navier-Stokes and heat transport equations in the rotating nontraditional f-plane. We considered a horizontal shear flow with a hyperbolic tangent profile as the base flow. The linear stability was analyzed numerically in wide ranges of parameters, and we performed an asymptotic analysis for large vertical wavenumbers using the Wentzel-Kramers-Brillouin-Jeffreys (WKBJ) approximation for nondiffusive and highly-diffusive fluids.

Results. As in the traditional f-plane approximation, we identify two types of instabilities: the inflectional and inertial instabilities. The inflectional instability is destabilized as f̃ increases and its maximum growth rate increases significantly, while the thermal diffusivity stabilizes the inflectional instability similarly to the traditional case. The inertial instability is also strongly affected; for instance, the inertially unstable regime is also extended in the nondiffusive limit as 0 < f < 1 + f̃ 2/N2, where N is the dimensionless Brunt-Väisälä frequency. More strikingly, in the high thermal diffusivity limit, it is always inertially unstable at any colatitude θ except at the poles (i.e., 0° < θ <  180°). We also derived the critical Reynolds numbers for the inertial instability using the asymptotic dispersion relations obtained from the WKBJ analysis. Using the asymptotic and numerical results, we propose a prescription for the effective turbulent viscosities induced by the inertial and inflectional instabilities that can be possibly used in stellar evolution models. The characteristic time of this turbulence is short enough so that it is efficient to redistribute angular momentum and to mix chemicals in stellar radiation zones.
The LOFAR Two-meter Sky Survey: Deep Fields Data Release 1
Authors: Tasse C. , Shimwell T. , Hardcastle M. J. , O’Sullivan S. P. , van Weeren R. , Best P. N. , Bester L. , Hugo B. , Smirnov O. , Sabater J. , Calistro-Rivera G. , de Gasperin F. , Morabito L. K. , Röttgering H. , Williams W. L. , Bonato M. , Bondi M. , Botteon A. , Brüggen M. , Brunetti G. , Chyży K. T. , Garrett M. A. , Gürkan G. , Jarvis M. J. , Kondapally R. , Mandal S. , Prandoni I. , Repetti A. , Retana-Montenegro E. , Schwarz D. J. , Shulevski A. , Wiaux Y.
Published: December 2020

The Low Frequency Array (LOFAR) is an ideal instrument to conduct deep extragalactic surveys. It has a large field of view and is sensitive to large-scale and compact emission. It is, however, very challenging to synthesize thermal noise limited maps at full resolution, mainly because of the complexity of the low-frequency sky and the direction dependent effects (phased array beams and ionosphere). In this first paper of a series, we present a new calibration and imaging pipeline that aims at producing high fidelity, high dynamic range images with LOFAR High Band Antenna data, while being computationally efficient and robust against the absorption of unmodeled radio emission. We apply this calibration and imaging strategy to synthesize deep images of the Boötes and Lockman Hole fields at ~150 MHz, totaling ~80 and ~100 h of integration, respectively, and reaching unprecedented noise levels at these low frequencies of ≲30 and ≲23μJy beam−1in the inner ~3 deg2. This approach is also being used to reduce the LOTSS-wide data for the second data release.
SUPER
Authors: Circosta C. , Mainieri V. , Lamperti I. , Padovani P. , Bischetti M. , Harrison C. M. , Kakkad D. , Zanella A. , Vietri G. , Lanzuisi G. , Salvato M. , Brusa M. , Carniani S. , Cicone C. , Cresci G. , Feruglio C. , Husemann B. , Mannucci F. , Marconi A. , Perna M. , Piconcelli E. , Puglisi A. , Saintonge A. , Schramm M. , Vignali C. , Zappacosta L.
Published: December 2020

Feedback from active galactic nuclei (AGN) is thought to be key in shaping the life cycle of their host galaxies by regulating star-formation activity. Therefore, to understand the impact of AGN on star formation, it is essential to trace the molecular gas out of which stars form. In this paper we present the first systematic study of the CO properties of AGN hosts at z ≈ 2 for a sample of 27 X-ray selected AGN spanning two orders of magnitude in AGN bolometric luminosity (log Lbol / erg s−1 = 44.7 − 46.9) by using ALMA Band 3 observations of the CO(3-2) transition (∼1″ angular resolution). To search for evidence of AGN feedback on the CO properties of the host galaxies, we compared our AGN with a sample of inactive (i.e., non-AGN) galaxies from the PHIBSS survey with similar redshift, stellar masses, and star-formation rates (SFRs). We used the same CO transition as a consistent proxy for the gas mass for the two samples in order to avoid systematics involved when assuming conversion factors (e.g., excitation corrections and αCO). By adopting a Bayesian approach to take upper limits into account, we analyzed CO luminosities as a function of stellar masses and SFRs, as well as the ratio LCO(3–2)′/M∗ (a proxy for the gas fraction). The two samples show statistically consistent trends in the LCO(3–2)′−LFIR and LCO(3–2)′−M∗ planes. However, there are indications that AGN feature lower CO(3-2) luminosities (0.4–0.7 dex) than inactive galaxies at the 2–3σ level when we focus on the subset of parameters where the results are better constrained (i.e., LFIR ≈ 1012.2 L⊙ and M* > 1011 M⊙) and on the distribution of the mean log(LCO(3–2)′/M∗). Therefore, even by conservatively assuming the same excitation factor r31, we would find lower molecular gas masses in AGN, and assuming higher r31 would exacerbate this difference. We interpret our result as a hint of the potential effect of AGN activity (such as radiation and outflows), which may be able to heat, excite, dissociate, and/or deplete the gas reservoir of the host galaxies. Better SFR measurements and deeper CO observations for AGN as well as larger and more uniformly selected samples of both AGN and inactive galaxies are required to confirm whether there is a true difference between the two populations.
Efficient wide-field radio interferometry response
Authors: Arras Philipp , Reinecke Martin , Westermann Rüdiger , Enßlin Torsten A.
Published: December 2020

Radio interferometers do not measure the sky brightness distribution directly, but measure a modified Fourier transform of it. Imaging algorithms therefore need a computational representation of the linear measurement operator and its adjoint, regardless of the specific chosen imaging algorithm. In this paper, we present a C++ implementation of the radio interferometric measurement operator for wide-field measurements that is based on so-called improved w-stacking. It can provide high accuracy (down to ≈10−12), is based on a new gridding kernel that allows smaller kernel support for given accuracy, dynamically chooses kernel, kernel support, and oversampling factor for maximum performance, uses piece-wise polynomial approximation for cheap evaluations of the gridding kernel, treats the visibilities in cache-friendly order, uses explicit vectorisation if available, and comes with a parallelisation scheme that scales well also in the adjoint direction (which is a problem for many previous implementations). The implementation has a small memory footprint in the sense that temporary internal data structures are much smaller than the respective input and output data, allowing in-memory processing of data sets that needed to be read from disk or distributed across several compute nodes before.
Density and temperature dependent growth of pikeperch (Sander lucioperca) in the Archipelago Sea
Authors: Saulamo Kari , Heikinheimo Outi , Lappalainen Jyrki
Published: December 2020

In the Archipelago Sea, pikeperch (Sander lucioperca) is an important species in both commercial and recreational fisheries. Pikeperch is caught mainly with small mesh size gillnets, and annual fishing mortality is high. The possible effects of such fisheries, as well as temperature or density on pikeperch growth have not been studied earlier. The first hypothesis of this study was that the effect of temperature on growth is positive and that of density is negative. The second hypothesis was that size-selectivity of gillnets causes the fast-growing individuals to be caught at younger ages than the slow-growing ones. The results showed that temperature had a significant positive effect on growth, and this was greater than the negative effect of year-class density, which was also significant. The gillnet selectivity caused a difference of up to 60 mm in back-calculated lengths in the fully recruited age groups within the same year class, between pikeperch caught at age 6+ and age 9+. Thus, the Rosa Lee phenomenon caused by gillnet size-selectivity led to the removal of faster growing specimens from the population at younger ages. This can potentially cause underestimation of real growth, and thus, poor fishery management.
Critical behavior of Pr0.65Sr0.35MnO3 compound investigated by a Monte Carlo Simulation
Authors: Omari Lhaj El Hachemi , Lekdadri Abdelmajid , Chami Rachid , Hlil El Kebir
Published: December 2020

The critical behavior and magnetic properties of Pr0.65Sr0.35MnO3 (symbolized here by PSMO) were studied using Monte Carlo Simulation (MCS). The thermal bath algorithm and Ising model in which exchange interactions via the third nearest neighbor were used to calculate the magnetic and magneto-caloric properties. The effects of temperature (T) and external magnetic field (h) on the magnetic behavior of PSMO were examined. The results show that the Curie temperature (TC) is close to the experimental value. The magnetic entropy shows a maximum value around the TC that increases linearly with the increase of the external field. The critical behavior of the PSMO compound was studied by analyzing the magnetization isotherms and by exploiting Arrott plots. The obtained values of the critical exponents are β = 0.336, γ = 1.121, and δ = 4.335. These values are very close to those reported for the 3D-Ising model. The variation of maximum magnetic entropy (ΔSmmax) and relative cooling power (RCP) around the Curie temperature were calculated; the obtained values of ΔSmmax and those of RCP ranging from 3.612 and 92.7 for 1T to 6.191 and 209.9 for 5T, respectively. These results are sufficiently interesting to consider the PSMO compound as a promising candidate for magnetic refrigeration.
Geometric aspects of certain second order differential systems in particle physics
Authors: Balan Vladimir , Red’kov Viktor , Ovsiyuk Elena , Krylova Nina
Published: December 2020

We consider the problem of the spin 1 particle with anomalous magnetic moment in an external Coulomb ﬁeld, in non-relativistic approximation. The structural stability of the extended second order ODE system is studied.
A mathematical model of infectious disease transmission
Authors: Florea Aurelia , Lăzureanu Cristian
Published: December 2020

In this paper we consider a three-dimensional nonlinear system which models the dynamics of a population during an epidemic disease. The considered model is a SIS-type system in which a recovered individual automatically becomes a susceptible one. We take into account the births and deaths, and we also consider that susceptible individuals are divided into two groups: non-vaccinated and vaccinated. In addition, we assume a medical scenario in which vaccinated people take a special measure to quarantine their newborns. We study the stability of the considered system. Numerical simulations point out the behavior of the considered population.
Voice and Position Simultaneous Communication System Based on Beidou Navigation Constellation
Authors: Ao Zhen , Li Feng , Ma Qiang , He Guiqing
Published: December 2020

Considering China Beidou has unique two-way communication capability for short messages that are not available in other navigation systems such as GPS, a 600bps vocoder adapted to the short message channel of Beidou is developed. The sinusoidal excitation linear prediction algorithm is adopted by the vocoder to achieve voice communication with clear communication quality. Furthermore, a coordinate compression algorithm for processing positioning information is designed to provide more transmission space for speech encoded data. Based on the above-mentioned results, a communication system that only the Beidou navigation system is used to complete two-way secure voice and positioning simultaneous interpretation is realized. The system firstly uses a voice conversion program to convert the voice coded data obtained by the vocoder codec module into the Beidou short message data format; and then the voice code analysis program and the latitude and longitude analysis program is used to parse the voice code and location information; Finally, the experimental results of voice communication and positioning transmission are verified on the Beidou short message transceiver, and the subjective MOS test score indicates that the way is paved for the practical use of Beidou short message voice communication.
A Few-Shot Modulation Recognition Method Based on Pseudo-Label Semi-Supervised Learning
Authors: Shi Yunhao , Xu Hua , Liu Yinghui
Published: December 2020

In order to solve the problem of insufficient labeled samples in modulation recognition, this paper proposes a few-shot modulation recognition algorithm based on pseudo-label semi-supervised learning (pseudo-label algorithm). First of all, high quality artificial feature, excellent classifier and data-labeling method are used to build efficient pseudo label system, and then the pseudo label system is combined with signal classification method based on the deep learning to realize the modulation classification under the condition of a small number of labeled samples and a large number of unlabeled samples. The simulation results show that the pseudo-label algorithm can improve the model recognition performance by 5%-10% when the six kinds of digital signals are classified and identified and its SNR is greater than 5 dB. At the same time, the algorithm has a simple network design and is of great application value.
Dynamic Coalition Task Allocation of Heterogeneous Multiple Agents
Authors: Li Xiangmin , Tang Jiayu , Dai Jinjin , Bo Ning
Published: December 2020

The dynamic coalition task allocation of heterogeneous multiple UAV agents is researched, which is divided into two parts. Firstly, the consensus based coalition algorithm(CBCA) is presented via consensus based bundle algorithm(CBBA), considering complex constraints of specific equipment requirements and coupling the relationships between the subtasks and the time windows. Secondly, three dynamic planning strategies are proposed in cope with appearance of new tasks during the allocation process. Finally, the feasibility and applicability of the present algorithm and dynamic planning strategies are validated in the scenario of a search and attack mission executed by multiple unmanned search aerial vehicles(USAVs) and unmanned combat aerial vehicles (UCAVs).
Rapid prototyping: applications in oral and maxillofacial surgery
Authors: Giovacchini Francesco , Gilli Massimiliano , Mitro Valeria , Monarchi Gabriele , Bensi Caterina , Tullio Antonio
Published: December 2020

This article documents four mandibular reconstructions performed using free fibula flaps. CT scan DICOM (Digital Imaging and COmmunication in Medicine) files were obtained in order to print stereolithographic models of the mandible, and in one case cutting guides for fibular osteotomies. One case study details the treatment a cancer recurrence on a right emimandibulectomy. Because of a lack of access to previous CT scans, the left part of the mandible was mirrored to obtain an accurate 3D model. In one case, due to the young age of the woman, a double barrel fibula flap was used. All cases resulted in satisfactory chewing function and aesthetic outcome, with no flap failures. The report concludes that Virtual Planning and Rapid Prototyping are helpful as they reduce costs and intraoperative times while simultaneously improving surgical precision.
The relationship of cultural intelligence with self-government of future teachers in the educational environment of a multi-ethnic region (on the example of the Khabarovsk Territory)
Authors: Kulesh E.V. , Vyaznikova L.F. , Vorobyeva C.I.
Published: December 2020

The paper presents the results of a study on the study of the relationship between self-government and the cultural intelligence of teachers in the educational environment of the multi-ethnic Khabarovsk Territory. The presented pedagogical system of interconnection based on the principles of using the cluster approach in the interaction of institutions of preschool, general, secondary vocational and higher education in the exchange of experience and the dissemination of best practices.
Self-concept as a factor in the formation of professional identity of future psychologists
Authors: Bura L.V. , Zalevskaya Ya.G.
Published: December 2020

The article deals with the problem of forming the professional identity of future psychologists, a study of the self-concept as a factor in the formation of the professional identity of future psychologists was conducted.
Psychological-pedagogical support and social-personal formation of students with disabilities in the process of adaptation to studying at the university
Authors: Emanova S.V. , Ryleeva A.S. , Kazancheva E.A.
Published: December 2020

The article provides data related to the determination of the degree of disabled students disadaptation to study at the university.A group of 20 respondents was studied.Programs of psychological support and extracurricular leisure activities were implemented in the course of the research.The correlation dependence of the emotional-value state of the personality of students and their participation in creative activity is revealed.The control experiment revealed positive dynamics (favorable emotional state of students, medium level of anxiety, increase in self-confidence).
Preparing a law teacher to implement the goals and content of the subject
Authors: Zhdanova N.S. , Aksenova L.N.
Published: December 2020

The paper examines the features of the training and activities of a law teacher in the context of the Russian legal tradition. The author concludes that teaching law based on the national tradition of legal thinking will provide a high quality of education and the formation of a highly moral legal consciousness of young people.
Continuing professional training as a factor of teachers’ professional and career growth
Authors: Kopchenko I. Ye. , Tvelova I.A. , Khlopkova V.M.
Published: December 2020

The article provides the analysis of modern trends in the development of education that call for steady professional advancement and improvement of professional competencies of teachers. The main vectors of teacher’s professional and career growth are defined. The role of continuing professional training as a leading factor of improving pedagogical activity in the modern changing world is emphasized. The main directions and goals of the development of continuing training within the field of study “Pedagogical Education” and the experience of implementation in Armavir State Pedagogical University are considered.