bluuebunny/crossref_metadata_2025 huggingface dataset:
Plasma-chemical method of silicon carbide modification to obtain particles with controlled surface morphology
Authors: Shalygina T. A.  , Rudenko M. S.  , Nemtsev I. V.  , Parfenov V. A.  , Voronina S. Yu.
Published: September 2022

A plasma-chemical method for the modification of silicon carbide particles is presented, which makes it possible to obtain particles with a controlled surface morphology. The variable parameter of particle processing was the ratio of the fraction of plasma-forming (Ar) and additional (H) gases. It was shown that at Ar/H = 100/0, the formation of a carbon shell is observed; at Ar/H ratios of 91/9 and 84/16, the particles are characterized by a carbon shell decorated with silicon nanoparticles or nanowires, respectively. The modified particles were analyzed using scanning electron microscopy and Raman spectroscopy. Keywords: silicon carbide, plasma chemistry, surface morphology, nanoparticles, nanowires, carbon shell, core-shell
In memoriam of E.M. Kruglov and V.V. Filimonov Quantum yield of an avalanche silicon photodiode in the 114-170 and 210-1100 nm wavelength ranges
Authors: Aruev P. N.  , Belik V. P.  , Blokhin A. A.  , Zabrodskii V. V.  , Nikolaev A. V.  , Sakharov V. I.  , Serenkov I. T.  , Filimonov V. V.  , Sherstnev E. V.
Published: September 2022

An avalanche silicon photodiode has been developed for the near IR, visible, UV and VUV light ranges. The external quantum efficiency has been studied in the 114-170 and 210-1100 nm ranges. It has been demonstrated that the avalanche photodiode reaches the quantum yield of 29 to 9300 electrons/photon at the 160 nm wavelength and bias voltage of 190-303 V, respectively. Keywords: avalanche photodiode, vacuum ultraviolet, visible light range, near IR, silicon
Features of single-mode emission in 7.5-8.0 μm range quantum-cascade lasers with a short cavity length
Authors: Babichev A. V.  , Kolodeznyi E. S.  , Gladyshev A. G.  , Denisov D. V.  , Kharin N. Yu.  , Petruk A. D.  , Panevin V. Yu.  , Slipchenko S. O.  , Lyutetskii A. V.  , Karachinsky L. Ya.  , Novikov I. I.  , Pikhtin N. A.  , Egorov A. Yu.
Published: September 2022

The possibility of realizing single-mode emission in quantum-cascade lasers due to modulation of output optical losses in a Fabry-Perot cavity is demonstrated. For the active region of the 7.5-8.0 μm spectral range, the two-phonon resonance design was used, thus, 50 stages and waveguide layers based on indium phosphide made it possible to realize single-mode 7.765 μm lasing at the temperature of 292 K. Side-mode suppression ratio was about 24 dB and remained the same with an increase in the current pumping up to 1.2 of the threshold current values. The coefficient of wavelength shift with temperature (temperature tuning) in the single-mode lasing regime was 0.56 nm/K. Keywords: superlattices, quantum-cascade laser, single-mode emission, indium phosphide.
The effect of He : O plasma treatment on the structure of multi-walled carbon nanotubes
Authors: Bolotov V.V.  , Knyazev E.V.  , Nesov S.N.
Published: September 2022

The functionalization of multi-walled carbon nanotubes in He : O plasma is investigated. It is shown that plasma treatment leads to the removal of defective outer graphene layers and their fragments due to oxidation. It is established that the surface of functionalized multi-walled carbon nanotubes contains numerous uncoordinated carbon atoms and oxygen-containing functional groups. The preservation of the structure of the internal graphene layers of nanotubes and the formation of broken chemical bonds ensure a decrease in electrical resistance. At the same time, there is a narrowing of the distribution of electrical resistance values of nanotube ensembles. Keywords: multi-walled carbon nanotubes, plasma treating, functionalization, transmission electron microscopy, X-ray photoelectron spectroscopy
Ferroelectric properties of heterostructure Sr-=SUB=-0.5-=/SUB=-Ba-=SUB=-0.5-=/SUB=-Nb-=SUB=-2-=/SUB=-O-=SUB=-6-=/SUB=-/Ba-=SUB=-0.2-=/SUB=-Sr-=SUB=-0.8-=/SUB=-TiO-=SUB=-3-=/SUB=-/Si(001)
Authors: Kiselev D. A.  , Pavlenko A.V.  , Zinchenko S.P.
Published: September 2022

The properties of c-oriented thin films of Sr0.5Ba0.5Nb2O6 grown on a Si(001) (p-type) substrate with a pre-deposited Ba0.2Sr0.8TiO3 layer were studied using scanning probe microscopy and dielectric spectroscopy. It is established that the Sr0.5Ba0.5Nb2O6 films are characterized by low surface roughness (less than 6 nm) and average crystallite size of ~ 93 nm. It is shown that there is spontaneous polarization in the film directed from its surface to the substrate, which causes the manifestation of the field effect for the case of the Si substrate with p-type conductivity without the external field effect. Differences in the magnitudes of the surface potential signal for regions polarized by an external electric field of different polarities (+10 and -10 V), as well as in their relaxation to the initial state, are revealed. The reasons for the established patterns are discussed. Keywords: barium-strontium niobate, SBN, scanning probe microscopy, thin films
Nonlinear effects in the sputtering of gallium arsenide and silicon by bismuth cluster ions
Authors: Tolstoguzov A. B.  , Mazarov P. A.  , Ieshkin A. E.  , Meyer F.  , Fu D. J.
Published: September 2022

An experimental study on the influence of the energy and the number of atoms in the bombarding ions Bin+ (n=1-4) on the sputter yield of GaAs was carried out. It was shown that the specific sputter yield Ysp non-additively increases with increasing n and specific kinetic energy Esp per an atom in the bombarding ion, and the efficiency of energy transfer from bombarding ions to target atoms also increases with increasing n. A comparison was made with the previously obtained results for Si targets. Keywords: ion sputtering, non-additivity factor, cluster ions, bismuth.
A GaInP-based photo-converter of laser radiation with an efficiency of 46.7% at a wavelength of 600 nm
Authors: Mintairov S. A.  , Evstropov V.V.  , Mintairov M.A.  , Nakhimovich M.V.  , Salii R. A.  , Shvarts M.Z.  , Kalyuzhnyy N.A.
Published: September 2022

GaInP-based laser power converters (LPC) structure grown by MOVPE and device chip design have been optimized for operation under high-power lasers of the green-red spectral range. Light I-V curves records have shown the performance of the LPC at up to 40-50 W/cm2 of incident power densities. The highest level data were obtained for 532, 600, and 633 nm power laser lines: 44.3%, 46.7%, and 40.6% under 13-16 W/cm2, respectively. LPC demonstrated an efficiency of more than 40% at the incident laser radiation power density elevated up to 40-50 W/cm2. Keywords: laser photoconverter, MOVPE, efficiency, spectral response.
Influence of irradiation with accelerated electrons on the physical properties of polyethylene terephthalate
Authors: Sharapova V. A.  , Kamantsev I. S.  , Shveikin V. P.  , Ivanov V. Yu.  , Ryaboukhin O. V.
Published: September 2022

The influence of irradiation with accelerated electrons (energy 8.5 MeV, dose 5 kGy) on the physical properties of medical devices made of polyethylene terephthalate (PET) was studied by infrared (IR) spectroscopy. The revealed post-irradiation changes in the IR spectra can be used to justify the choice of the dose of irradiation of PET products with electrons during the radiation sterilization procedure. Keywords: polyethylene terephthalate, irradiation with accelerated electrons.
Investigation of the interfacial tension at the interface between water and asphaltene solution in toluene
Authors: Zinnatullin R. R.  , Iskandarov A.I.  , Kovaleva L.A.
Published: September 2022

The dynamics of the interfacial tension coefficient at the interface between water and model solutions of asphaltenes of different concentrations in toluene has been studied. It has been shown that, over time, the interfacial tension decreases due to the adsorption of asphaltene molecules at the interface. With an increase in the concentration of asphaltenes in the solution, the decrease in interfacial tension occurs more intensively. The results of a study of the elongation of a water drop in a solution under the influence of an electric field are presented. It is shown that after the formation of an adsorption film, a higher electric field must be applied to stretch the droplet, and the relative elongation depends nonlinearly on the applied voltage. Keywords: interfacial tension coefficient, asphaltenes, adsorption film, drop elongation.
Double negative media based on antiferromagnetic semiconductors for the terahertz frequency range
Authors: Grishin S. V.  , Bogomolova A. V.  , Nikitov S. A.
Published: September 2022

The paper presents the results of a theoretical study of the dispersion characteristics of electromagnetic waves (EMW) existing in a transversely magnetized antiferromagnetic (AFM) semiconductor with loss. An AFM semiconductor is an infinite bi-gyrotropic medium, the effective material parameters of which are twice negative in several frequency ranges. It was found that these frequency bands are in the terahertz range, and there are four backward EMEs in them, two of which are TE waves, and the other two are TM waves. Keywords: left-handed media, antiferromagnets, semiconductors, spin waves.
The effect of AlN buffer layer morphology on the structural quality of a semipolar GaN layer grown on a Si(001) substrate, according to transmission electron microscopy data
Authors: Kirilenko D. A.  , Myasoedov A. V.  , Kalmykov A. E.  , Sorokin L. M.
Published: September 2022

Structural features of the interface between a semipolar gallium nitride layer and buffer layer of aluminum nitride grown on a SiC/Si(001) template misoriented by an angle of 7 were studied by high-resolution transmission electron microscopy. The effect of interface morphology on the structural quality of the gallium nitride layer was revealed: faceted structure of the buffer layer surface reduces the threading dislocations density. Keywords: semipolar GaN, transmission electron microscopy, dislocation, Si(001) substrate
Statistical analysis of Taylor bubble formation in a capillary pipe
Authors: Ronshin F. V.  , Kochkin D. Y.  , Dementyev Y.A.  , Eloyan K. S.  , Vozhakov I. S.
Published: September 2022

An experimental study of the Taylor regime in a pipe with an inner diameter of 2 mm has been carried out. A method for studying the Taylor regime in a capillary pipe using automatic image analysis to measure the main characteristics of bubbles has been developed and applied for the first time. The dependences of the gas bubble and liquid slug lengths on the gas and liquid velocities are studied. It was found that in the region of the stable Taylor regime, the standard deviation of the bubble sizes is close to the accuracy of the research method. The dispersion of the bubble size distribution increases near the regime boundary. It is shown that, based on the statistical analysis of a large amount of data, it can be concluded that there is a coalescence and fragmentation of bubbles. Keywords: capillary pipe, two-phase flow, Taylor regime, statistical analysis.
Deposition of the amorphous metal coating onto hollow glass microspheres
Authors: Pal A. F.  , Ryabinkin A. N.  , Serov A. O.
Published: September 2022

Amorphous metal Pt-Zr coatings micron in thickness, as well as crystalline ones, were obtained on the surfaces of hollow thin-wall glass microspheres using direct current magnetron sputtering at the deposition rate of 0.1 nm/s. Being in the range of 1-1.5 nm, the roughness of the obtained amorphous coatings is essentially lower than that of crystalline coatings of the same composition. Keywords: metal glasses, amorphous metal films, platinum, zirconium, magnetron sputtering, glass microspheres, inertial confinement fusion targets.
Subwave textured surfaces for the radiation coupling from the waveguide
Authors: Voznyuk G. V.  , Grigorenko I. N.  , Mitrofanov M. I.  , Nikolaev V. V.  , Evtikhiev V. P.
Published: September 2022

The paper presents a procedure for creating on GaAs(100) substrates textured surfaces by ion-beam etching with a focused beam. The possibility of flexibly controlling the shape and profile of the formed submicron elements of textured media is shown; this will later allow formation of textured surfaces of almost any complexity for realizing the surface radiation coupling from the waveguide. Original lithographic masks were developed, and 3D lithography was accomplished. The obtained lithographic patterns were controlled by the methods of optical, electron and atomic force microscopy. Keywords: ion-beam etching, metasurface, textured surface, lithography, surface coupling of radiation.
The initial stages of the formation of a pulsed discharge in a gap with a tip-plane geometry in preionized argon
Authors: Kurbanismailov V.S.  , Tereshonok D.V.  , Ragimkhanov G.B.  , Khalikova Z.R.
Published: September 2022

The study of the effect of the initial conditions on the features of the formation and development of the anodic ionization wave between two electrodes with a tip-plane gap geometry in argon at atmospheric pressure is performed on the basis of a two-dimensional axisymmetric drift-diffusion model. Keywords: gas discharge, low-temperature plasma, gas breakdown, ionization waves, simulation.
Study of the effect of modified montmorillonite as a filler on the properties of composite granules based on polycaprolactone
Authors: Ertiletskaya N. L.  , Sukhanova A. A.  , Boyandin A. N.  , Shalygina T. A.  , Kozyr O. A.  , Vasiliev A. D.
Published: September 2022

The paper presents the results of a study of the effects of the "Monament-101" filler and the method of obtaining on the properties of composite granules based on polycaprolactone (PCL). DSC and X-ray diffraction analysis showed an increase in the degree of crystallinity from 52 to 67% and a slight decrease in the melting point (by 2oC) as the clay was introduced into the polymer. Keywords: polycaprolactone, montmorillonite, composites, crystallinity, melting point.
Work of formation of a cluster of a new phase that is in a uniform external electric field and in the field of an ion outside the cluster
Authors: Vlasov V. A.
Published: September 2022

In the framework of the classical thermodynamic approach, an expression for the joint contribution to the work of formation of a spherical cluster of a new phase from the side of a uniform external electric field and the field of an ion that is outside the cluster is obtained. The analysis of the obtained expression in the case of the vapor-liquid phase transition is carried out. Keywords: nucleation, work of cluster formation, electric field, ions, nucleation rate.
A 9-Year Teledermoscopy Service in New Zealand: Retrospective Service Review
Authors: Teoh Novell Shu Chyng , Oakley Amanda
Published: September 2022

Background

A teledermoscopy service was established in January 2010 wherein patients attended nurse-led clinics for the imaging of lesions of concern and remote diagnosis by a dermatologist.

Objective

This study aims to review the number of visits, patient characteristics, the efficiency of the service, and the diagnoses made.

Methods

We evaluated the waiting times and diagnoses of skin lesions for all patient visits from January 1, 2010, to May 31, 2019. The relationships between patient characteristics and the diagnosis of melanoma were specifically analyzed.

Results

The teledermoscopy clinic was attended by 6479 patients for 11,005 skin lesions on 8805 occasions. Statistically significant risk factors for the diagnosis of melanoma and melanoma in situ were male sex (P<.001), European ethnicity (P=.001), an age of 65 to 74 years (P=.001), and Fitzpatrick skin type 2 (P=.001). Attendance was maximal during 2015 and 2016. The seasonal variations in visits from 2011 to 2018 revealed a consistent peak at the end of summer and a dip at the end of winter. In the year 2010, a total of 306 patients attended the clinic; 76.1% (233/306) of these patients were discharged to primary care, and 23.9% (73/306) were referred to a hospital for a specialist assessment. For patients who were diagnosed with suspected melanoma by a dermatologist from January 1, 2010, to May 31, 2019, the median waiting time for an imaging appointment was 44.5 (mean 57.9; range 8-218) days. The most common lesions diagnosed were benign naevus (2933/11,005, 26.7%), benign keratosis (2576/11,005, 23.4%), and keratinocytic cancer (1707/11,005, 15.5%); melanoma was suspected in 4.6% (507/11,005) of referred lesions. The positive predictive value of melanoma and melanoma in situ was 61.1% (320 true positives and 203 false positives). The number needed to treat (ie, the ratio of the total number of excisions to the number with a histological diagnosis of melanoma or melanoma in situ) was 2.02.

Conclusions

A teledermoscopy service offered by nurse-led imaging clinics can provide efficient and convenient access to dermatology services by streamlining referrals to secondary care and prioritizing patients with skin cancer for treatment.
Women’s Satisfaction With Telehealth Services During The COVID-19 Pandemic: Cross-sectional Survey Study
Authors: Mittone Diletta F , Bailey Caitlin P , Eddy Ebony L , Napolitano Melissa A , Vyas Amita
Published: September 2022

Background

Since March 2020, the need to reduce patients’ exposure to COVID-19 has resulted in a large-scale pivot to telehealth service delivery. Although studies report that pregnant women have been generally satisfied with their prenatal telehealth experiences during the pandemic, less is known about telehealth satisfaction among postpartum women.

Objective

This study examined telehealth satisfaction among both pregnant and recently pregnant women during the COVID-19 pandemic, to determine whether demographic factors (ie, race, age, marital status, education level, household income, and employment status) are associated with telehealth satisfaction in this population.

Methods

A web-based cross-sectional survey designed to capture data on health-related behaviors and health care experiences of pregnant and recently pregnant women in the United States was disseminated in Spring 2022. Eligible participants were at least 18 years old, identified as a woman, and were currently pregnant or had been pregnant in the last 3 years.

Results

In the final analytic sample of N=403, the mean telehealth satisfaction score was 3.97 (SD 0.66; score range 1-5). In adjusted linear regression models, being aged 35-44 years (vs 18-24 years), having an annual income of ≥ US $100,000 (vs < US $50,000), and being recently (vs currently) pregnant were associated with greater telehealth satisfaction (P≤.049).

Conclusions

Although perinatal women are generally satisfied with telehealth, disparities exist. Specifically, being aged 18-24 years, having an annual income of < US $50,000, and being currently pregnant were associated with lower telehealth satisfaction. It is critical that public health policies or programs consider these factors, especially if the expanded use of telehealth is to persist beyond the pandemic.
The logistical challenges to implement the environmental management system in a natural gas company in the North Region
Authors: Pires Darlene Ribeiro , Lima Alexandra Amaro de
Published: September 2022

The implementation of the environmental management system (EMS) in large companies arises from the need to standardize operations and reduce environmental impacts. The general objective of the study is to develop a protocol for an environmental management system based on ISO 14001 standards in a natural gas company in the region of Amazonas-AM. The monitoring data, indicators of the SGA used in this work were collected in a gas pipeline company in the North region, located in Manaus. In the development of this work, the methodology used consists of exploratory, documentary, with quali-quantitative data, where a survey of information about the EMS of the companies and the logistical system used for the execution of the EMS activities was carried out. The information was collected through interviews and questionnaires applied to the company's environmental professionals. It is concluded that in an internal context, the company is well strengthened because within its processes in the value chain, there are well-structured areas such as Social Management, Environmental Management in its licensing, monitoring and environmental auditing segments, which contribute to ensuring legal, contractual and international standardization requirements, such as those of the ISO 14001:2015 standard. However, the work found, in a comparative analysis with other regions, that the region's logistics system is the main challenge for the company that works with natural gas that affects organizational activities and, consequently, its EMS is affected. Therefore, it appears that the aspect that must be developed immediately to improve the EMS is logistics.
Hydrogen production by water electrolysis using TEA.PS-BF4 ionic liquid and alternative electrocatalysts
Authors: Becker Márcia R. , A. Arguello Sergio , C. Padilha Janine
Published: September 2022

Studies on water electrolysis are in permanent development to improve its processes with electrodes and electrolytes that offer lower overpotential values. This work uses an ionic liquid (IL) – tetrafluoroborate of 3-triethylammonium-propane sulfonic acid (TEA-PS.BF4) – as electrolyte and studies the effect of different electroactive cathode materials on hydrogen production, such as platinum (Pt), nickel (Ni), palladium (Pd), gold (Au) or silver (Ag). Water electrolysis was performed in a Hoffman Cell and analysed by chronoamperometry (CA) and linear sweep voltammetry (LSV) techniques. For the electrodes studied here, in a 0.1 M TEA-PS.BF4 solution, current density (j) values were 252-404 mA cm-2; for 0.3 M TEA-PS.BF4, values were 406-728 mA cm-2; and for 0.7 M, values were 822-1055 mA cm-2. Low activation energy (Ea) of 5 kJ mol-1 was found for the Au cathode, 9 kJ mol-1 for Pt and Ag, and 24 kJ mol-1 for Ni and Pd. Results show that the Ni electrode is an attractive alternative for hydrogen production by water electrolysis and using IL as electrolyte.
Sea Transportation Business Management Patterns in South Lembeh District, Bitung City, North Sulawesi
Authors: Manoppo Victoria ENManoppo EN , Sondakh Srie Jean , Luasunaung Alfret
Published: September 2022

Lembeh Island is part of Bitung City and has 2 sub-districts, namely South Lembeh District and North Lembeh District, where the economic activity of the community is very dependent on sea transportation. Papusungan Village is located in South Lembeh District. Sea transportation activities or activities are interesting because this business is a business that is mostly carried out by the people of Papusungan Village. The purpose of this research is to find out and explain how Management Pattern of Sea Transportation Business in Papusungan Village, South Lembeh District, Bitung City. The method used is the survey method. Data collection is primary data and secondary data. The sampling method is using the purposive sampling method to get a sample, namely respondents who work in the field of sea transportation in Papusungan Village. The analysis used in this research is SWOT analysis (Strength, Weakness, Opportunity, Threats) which is then explained through quantitative and qualitative descriptive analysis. The results show the management pattern of the sea transportation business, namely: 1) Improving skills in the taxi boat business because there is no rejection from the community, 2) Increasing the standard of boat comfort and safety 3 ) Development and improvement of facilities and infrastructure for sea transportation business, 4 ) Cooperation between the government and taxi boat businesses, 5 ) There is a need for boat loading standards based on boat capacity to be measurable, 6) Policies from the government to further improve regulations for passenger safety for better transportation.
Several Techniques and methods for Improving english teaching Quality for Students based on Learner-Centered Approach
Authors: Viet Ha Ngo Tran , Hoa Le Huong , Trang Hoang Thien , Thuy Pham Le , Huy Dinh Tran Ngoc
Published: September 2022

Vietnam has experiences fast achievements in teaching English for high school students in long time. One of this study’s purposes is to state what are challenges in teaching English and recommendations. Barraket (2005) pointed that the re-orientation of the curriculum toward student-centredness in this case had a positive effect on student performance, learning experience and subject evaluation. In particular, the use of student-centred techniques facilitated a strong social context for learning, and provided students with a common experiential framework from which to explore the technical aspects of the curriculum. By using combination of different qualitative methods, SWOT and PDCA analytical techniques, our research results shown, We make suggestions to I,prove teaching quality: 1. Quality control of teacher input (degrees, teaching experience, trial teaching requirements); 2. Develop a set of standards for teacher quality
Analysis of Cable Stayed Bridge and Girder Bridge Considering Seismic Forces and I.R.C. Loading
Authors: Kumar Prince , Bandewar Deepak , Jat Sachin
Published: September 2022

Abstract: A bridge is a structure which is built over some physical obstacles such as a body of water, valley, road and railway, its purpose is to provide crossing over that obstacle. Numerous bridges are in exist namely Arch Bridge, Girder Bridge, Suspension bridge, Cable stayed Bridge, etc. Design of bridges varies depending on the function of the bridge, the nature of the terrain where the bridge is constructed and anchored, the funds available to build it. Structural analysis is a process to analyze a structural system to predict its responses and behaviour by using physical laws and mathematical equations. The main objective of structural analysis is to determine internal forces, stresses and deformation of structure under various load effects. In the present work, Girder Bridge and Cable stayed bridge are modelled and comparative analysis is carried out for dynamically loading conditions. A comparison is made between the bridges for dead load, live load and combined load.
Discursos subversivos
Authors: Oliveira Danilo Araujo de , Ferrari Anderson
Published: September 2022

Vendo-nos envolvidos em uma atmosfera que nos entristece e minimiza nossa agência, sentimo-nos impelidos a mobilizar ditos de resistência sobre gênero de um professor e duas professoras de uma escola pública. Esses ditos estão inscritos em discursos subversivos sobre normas de gênero, afirmando o possível no currículo escolar e a vida em sua multiplicidade, fora de fronteiras e enquadramentos da normatividade. Acreditamos que possam reativar a resistência, o que é sempre possível. O texto é parte de uma pesquisa de mestrado em Educação que analisou processos de (re)produção de sujeitos generificados em uma escola pública de educação básica, em Aracaju – SE, elaborada na perspectiva pós-crítica educacional entre 2015 e 2017. Como metodologia, articulamos entrevistas semiestruturadas – com 16 docentes, 12 mulheres e 4 homens, com idades entre 27 e 66 anos –, análise do discurso e problematização de inspiração foucaultiana. Para este texto trouxemos excertos de 3 dessas entrevistas. Podemos afirmar que apesar de todo investimento no apagamento das questões de gênero, as resistências constituem o fazer docente.
Formação continuada
Authors: Aureliano Francisca Edilma Braga Soares , Silva Júnior Luiz Carlos da Costa
Published: September 2022

Este trabalho inscreve-se no projeto de pesquisa A formação continuada do Pacto Nacional de Alfabetização na Idade Certa – PNAIC e a aprendizagem dos docentes cursistas, do Grupo de Pesquisa Formação, Currículo e Ensino – Formace, da Universidade do Estado do Rio Grande do Norte. Na perspectiva metodológica da pesquisa crítica e dialética (MARX, 2011), o estudo teve como objetivo investigar os desafios e as contribuições do PNAIC para a prática docente de professoras alfabetizadoras de uma escola municipal em Patu, RN. Os dados das entrevistas foram organizados de acordo com os princípios dos núcleos de significação, teorizados por Wanda Maria Aguiar e Sérgio Ozella (2013). Constatou-se que as docentes se apropriaram de alguns conceitos, mas não conseguiram articulá-los em suas práticas, por conta do apego às metodologias tracionais de alfabetização, que se distanciam das estratégias indicadas no PNAIC.
processo da reforma do ensino médio no Rio de Janeiro
Authors: Pereira Natália Silva , Ciavatta Maria , Gawryszewski Bruno
Published: September 2022

No presente texto, discutimos a implementação da reforma do ensino médio no estado do Rio de Janeiro. Analisamos o processo conduzido pela Secretaria de Educação – SEEDUC-RJ, que o descreveu como uma ação indo ao encontro dos desejos de jovens e com ampla participação da comunidade escolar. A partir da análise dos documentos publicados e transmissões ao vivo em redes sociais pela SEEDUC e pelo Conselho Estadual de Educação, entendemos que se trata de uma política educacional em um contexto de recrudescimento do neoliberalismo, com uma ofensiva do capital sobre o trabalho, que aliena estudantes da formação integrada com conhecimentos gerais e específicos. Há mais de uma década, o estado do Rio de Janeiro tem sido um laboratório para medidas que pretendem reformar o ensino médio, com o objetivo de incorporar o projeto pedagógico do capital. Concluímos que, embora tenham ocorrido disputas de sentido e denúncias sobre esse processo de implementação, sob pretexto da urgência do prazo por parte da SEEDUC-RJ, não houve acolhimento das considerações da comunidade escolar, com o propósito de consolidar o Novo Ensino Médio sem maiores intercorrências.
Conversando com Tarsila
Authors: Thesing Mariana Luzia Corrêa , Trombetta Elisangela Melnik , De Freitas Mara Silveira
Published: September 2022

Este texto apresenta uma experiência de trabalho interdisciplinar, realizada em 2019, com três turmas de terceiros anos do ensino fundamental do Colégio de Aplicação da Universidade Federal de Santa Catarina – UFSC. O trabalho pedagógico teve como elo integrador o estudo da vida e das obras de Tarsila do Amaral, com atividades relacionadas ao ensino da Língua Portuguesa, da Matemática e das Ciências Humanas e da Natureza. Os/as estudantes foram desafiados/as em diferentes propostas: escrever sobre si e suas histórias de vida; observar e registrar os elementos diversos que compõem as paisagens da escola e de cenários cotidianos; relacionar os conhecimentos matemáticos subjacentes, dentro e fora da escola. Entendemos que as práticas de ensino desenvolvidas corroboraram o aprimoramento das habilidades críticas a partir da leitura das obras apresentadas e incentivaram o olhar dos/as estudantes para as relações entre as diferentes áreas do conhecimento e os contextos históricos, políticos e estéticos que marcaram as produções da artista.
Novo Ensino Médio no Espírito Santo
Authors: Ferreira Eliza Bartolozzi , Cypriano Alessandra Martins Constantino
Published: September 2022

O artigo traz dados de pesquisa sobre a implantação do Novo Ensino Médio – NEM na rede estadual do Espírito Santo, a partir de levantamento realizado por análise documental e entrevista semiestruturada com diretores/as de 16 escolas de ensino médio, que iniciaram o NEM em 2019. A experiência do Espírito Santo é singular porque iniciou o NEM nas escolas que anteriormente ofertavam a Escola Viva, com aspectos comuns na parte diversificada do currículo – projeto de vida, eletivas e estudo orientado –, buscando alavancar o protagonismo e o empreendedorismo na vida dos/as jovens. Os relatos dos/as diretores/as entrevistados/as revelam uma consonância com os princípios da reforma, não obstante enfrentarem problemas maiores em razão da pandemia, que são encarados como desafios altruísticos por gestores/as selecionados/as pela Secretaria de Educação por seus perfis gerencialistas e voluntaristas.
Implantação do Novo Ensino Médio no Amapá
Authors: Cassiano Drago Crislaine , Moura Dante Henrique
Published: September 2022

O artigo analisa os primeiros movimentos da implantação da reforma do ensino médio no Amapá. A análise envolveu o período compreendido entre a emissão da Medida Provisória n. 746/2016 e sua efetivação, no início de 2022. É um estudo bibliográfico e empírico, com análise documental e a entrevista de uma gestora da Secretaria Estadual de Educação, abrangendo as políticas educacionais, notadamente de ensino médio, e as implicações da reforma para os/as jovens. Os resultados preliminares revelam a implantação iniciada com uma parceria público-privada, para inserção do modelo das Escolas da Escolha. Chamado no Amapá de Escolas do Novo Saber, o modelo foi introduzido em escolas-piloto no estado a partir de 2017, trazendo as bases para o Novo Ensino Médio em implantação no país.
reforma do ensino médio no Paraná
Authors: Da Silva Monica Ribeiro , Barbosa Renata Peres , Körbes Clecí
Published: September 2022

O artigo trata da regulamentação das bases curriculares do chamado Novo Ensino Médio na rede estadual de ensino do Paraná, considerando-se o que está previsto na Lei 13.415/17. A pesquisa se apoiou em fontes bibliográficas, documentais e de campo para analisar o processo e os produtos dessa regulamentação, por meio de três eixos investigativos: currículo e políticas curriculares; trabalho docente; projeto formativo e juventude(s) do ensino médio. As conclusões assinalam uma política curricular marcada por ausência de participação e a produção de uma base curricular de matiz economicista, com indícios de um processo de intensificação e desqualificação da docência e a realização de um projeto formativo que induz à maior segmentação no sistema escolar brasileiro.
Argumentos do Banco Mundial sobre a crise de aprendizagem
Authors: Guerra Dhyovana , Gonçalves Amanda Melchiotti , Sandri Simone , Figueiredo Ireni Marilene Zago
Published: September 2022

Este artigo trata dos argumentos do Banco Mundial – BM para justificar a denominada crise de aprendizagem: entre 1980 e 1990, a baixa escolaridade e a falta de capital humano explicavam a pobreza; com a atual expansão da oferta escolar, a condição econômica dos países seria gerada pela crise de aprendizagem na escola. Discute-se, então, como a noção de crise de aprendizagem anunciada pelo BM (2018) sustenta a ressignificação e a intensificação das recentes reformas educacionais brasileiras. Para isso, adotou-se a abordagem qualitativa, com pesquisa nos documentos do BM sobre essa crise, e a pesquisa bibliográfica para interlocução com esses dados. Como principais resultados, tem-se continuidade e aprofundamento do gerencialismo nas atuais reformas educacionais, centralizando a responsabilidade pela crise na escola, em professores/as e no desempenho de estudantes. O BM ressignifica os termos para intensificar o projeto de educação dos anos de 1990.
Itinerários formativos e ‘liberdade de escolha’
Authors: Cássio Fernando , Goulart Débora Cristina
Published: September 2022

Este trabalho analisa a promessa de ‘liberdade de escolha’ feita a estudantes brasileiros/as com a Lei n. 13.415/2017, articulando três elementos: i) delineamento da ‘livre escolha’ no Conselho Nacional de Secretários de Educação – Consed e na Frente Currículo e Novo Ensino Médio; ii) o estado de São Paulo na vanguarda nacional da implementação do Novo Ensino Médio – NEM; iii) relação entre escolha individual, oferta de itinerários formativos e indicadores socioeconômicos na rede estadual paulista. A análise comparada da ‘escolha’ de itinerários pelos/as estudantes – feita em 2021, online – e da efetiva oferta dos itinerários pelas escolas em 2022 confirma duas previsões das pesquisas em educação: i) a ‘livre escolha’ no NEM depende das condições materiais das redes de ensino, mais que das aspirações individuais; ii) estudantes de nível socioeconômico mais elevado têm maior ‘liberdade de escolha’. Assim, o estado de São Paulo é primeiro a demonstrar que a flexibilização curricular prometida na reforma amplifica as desigualdades educacionais.
Não está calado quem peleia
Authors: Saraiva Mateus , Chagas Ângela , Luce Maria Beatriz
Published: September 2022

Em estudo sobre as disputas na atual reforma do ensino médio no Rio Grande do Sul, foi realizada uma análise temática sobre a política no período 2020-2021, a partir de dez lives, com 45 falas, representando 33 instituições, organizações sociais, sindicatos e escolas. Percebeu-se um modus operandi autoritário, que não oportuniza tempo nem espaço à base para debater e legitimar a viabilidade de um ensino médio mais democrático. De um lado, há profissionais e estudantes de escolas públicas e pesquisadores/as preocupados/as com o esvaziar de conteúdos e o rompimento da ideia de educação básica; noutro, governador, Seduc e Sindicato do Ensino Privado, a fim de disciplinar para o mercado de trabalho precarizado, com um posicionamento individualista e atomizante que preponderou no Referencial Curricular Gaúcho. Porém, nas falas analisadas, as comunidades escolares seguem articulando, discutindo e se opondo a tal proposta, unindo-se na crítica à fragmentação como estratégia curricular, administrativa, e, diante da penetração privatista, apresentando-se em defesa do público.
Novo Ensino Médio na prática
Authors: Jacomini Márcia Aparecida
Published: September 2022

A reforma do enisno médio tomou corpo com a Medida Provisória n. 746, de 22 de setembro de 2016, posteriormente convertida pelo Congresso Nacional na Lei n.13.415, sancionada por Michel Temer em 16 de fevereiro de 2017. O estado de São Paulo foi o primeiro a aprovar um novo currículo para o ensino médio em julho de 2020. Durante a pandemia, em 2021, com as escolas ainda fechadas, iniciou-se a implementação do Novo Ensino Médio (o nome-fantasia da Reforma) para os estudantes que cursavam o 1º ano desta etapa da educação básica. Num processo um tanto conturbado, com base em consultas que, pelo caráter aligeirado e desprovido de discussões, não se consubstanciaram em participação efetiva das comunidades escolares, o Novo Ensino Médio na rede estadual paulista tem apresentado problemas que vão muito além daquilo que poderia ser considerado característico de mudanças educacionais de grande porte. Para conhecer alguns desses problemas na perspectiva de professionais que estão acompanhando a implantação do Novo Ensino Médio nas escolas da rede estadual de ensino de São Paulo, convidamos três diretoras escolares para falar sobre essa experiência: Hélida Lança, Márcia Regina da Silva e Janaina Paulieli Lavado.
A novel pharmacological treatment concept for neuroprotection in severe traumatic brain injury -- two case reports
Authors: Trimmel Helmut , Herzer Guenther , Derdak Christoph , Kettenbach Joachim , Grgac Ivan
Published: September 2022

Severe traumatic brain injury is a leading cause of death and disability
worldwide, resulting in a significant individual and socioeconomic
burden. We present two cases of severe traumatic brain injury with
surprisingly encouraging outcomes. We attribute this to the additional
combined administration of citicoline and cerebrolysin.
Pengaruh Model Quantum Learning Berbantu Media Roda Putar Terhadap Motivasi dan Hasil Belajar Siswa
Authors: Selfara Tri Susan Rahayu Arinta , Wijayanti Rica , Faulina Ria
Published: September 2022

Abstrak. Penelitian ini dilakukan berdasarkan hasil survei yang dilakukan peneliti pada saat PLP 2 di SMA N 3 Bangkalan, dimana siswa sering mengalami kebosanan dan ketidaktarikan siswa untuk memahami materi yang disampaikan oleh guru khususnya pada pelajaran matematika. Hal ini terjadi dikarenakan hilangnya motivasi belajar siswa yang berujung buruk pada hasil belajar siswa. Model pembelajaran Quantum learning berbantu media Roda Putar menjadi pilihan peneliti untuk melakukan uji coba penerapan pada saat pembelajaran sehingga siswa bisa memgikuti pembelajaran dengan model serta media yang berbeda dari sebelumnya yang lebih kreatif. Penelitian ini bertujuant untuk mengetahui ada tidaknya pengaruh model pembelajaran Quantum learning berbantu media Roda Putar ditinjau dari  motivasi dan hasil belajar siswa pada materi trigonometri kelas X MIPA SMA N 3 Bangkalan. Metode penelitian ini menggunakan angket motivasi belajar yang berjumlah 15 pernyataan dan tes hasil belajar yang diberikan kepada siswa kelas X MIPA 1 dan 2 dimana ada kelas eksperimen dan kelas kontrol. Nilai tes dari kelas eksperimen memiliki rata-rata 87,07 untuk kelas kontrol rata-ratanya adalah 54,67. Hasil ini diperoleh dengan menggunak uji normalitas, uji homogentias dan uji hipotesis yang kemudian diolah menggunakan SPSS.21.
Analisis Kemampuan Komunikasi Matematis Siswa Sekolah Menengah Dalam Implementasi Model Discovery Learning
Authors: Limbangan Nida Aulia Pangesti , Putra Beni Yusepa Ginanjar , Kandaga Thesa
Published: September 2022

Kemampuan komunikasi matematis merupakan kemampuan yang penting dimiliki oleh siswa. Salah satu alternatif model pembelajaran yang dapat membantu mengembangkan kemampuan komunikasi matematis siswa yaitu model discovery learning. Penelitian ini bertujuan untuk menganalisis dan mendeskripsikan kemampuan komunikasi matematis siswa sekolah menengah dalam implementasi model discovery learning. Jenis penelitian yang digunakan adalah studi kepustakaan dengan pendekatan kualitatif. Sumber data yang digunakan dalam penelitian ini adalah data primer dan data sekunder terkait dengan kemampuan komunikasi matematis yang berasal dari artikel jurnal nasional dan internasional yang bereputasi. Data primer dan data sekunder terkait kemampuan komunikasi matematis masing-masing sebanyak 16 artikel dan 15 artikel. Hasil penelitian menunjukkan bahwa kemampuan komunikasi matematis siswa sekolah menengah dalam implementasi model discovery learning berada pada kategori baik.
The effect of grass silage harvesting strategy and concentrate level on feed intake, diet digestibility and milk production of dairy cows
Authors: Sairanen Auvo , Juutinen Elina , Rinne Marketta
Published: September 2022

Two experiments were conducted under Northern European conditions to quantify dairy cow responses to variable grass silage quality and concentrate feed supplementation. Experiment 1 included 3 primary growth grass silages (early, intermediate and late maturity stage) supplemented with three concentrate levels (9, 12 and 15 kg d-1). Experiment 2 included three consecutive harvests (first, second and third harvest from the same sward within the growing season) and three levels of concentrate supplementation (9, 11 and 13 kg d-1). Dairy cows responded clearly to changes in the harvesting time of silage in primary growth (quadratic effect) and amount of concentrate (linear effect) in the diet in Experiment 1. Milk yield was the lowest with third harvest silage in Experiment 2, and responses to increasing concentrate allowance were linear. Interactions between silage quality and concentrate supplementation were detected in Experiment 1, where milk production responses to additional concentrate decreased with increasing silage digestibility. No interactions were found in Experiment 2, probably due to the small range of differences in nutritional quality between the silages prepared from different harvests. The results demonstrated that it is difficult to compensate for low silage digestibility by increasing the amount of concentrate. The variable ECM response (from –0.01 to 0.85 kg ECM per kg DM incremental concentrate in the diet) is explained by the concomitant decrease in silage intake and negative effect on diet neutral detergent fibre digestibility.
Chronology of Scientific Publication
Authors: Vorobiev A. A. , Gorbunov-Posadov M. M. , Ermakov A. V. , Polilova T. A. , Skornyikova R. Yu.
Published: September 2022

The purpose and ways of presenting the key dates delineating the individual stages of the life cycle of a modern scientific publication are considered. For the author who plans to publish his work in a particular journal, the most interesting dates are the dates of the preliminary stages: reviewing, proofreading, layout, etc. The key date, usually reflected in the bibliographic reference to the published work, is the year of its publication. It is necessary to distinguish between the title year appearing on the cover and in the bibliographic reference, and the actual year recorded in the output of the publication. The title and actual years in some cases may not coincide, which often leads to various misunderstandings. With the advent of the Internet, other dates are also included in the consideration, in particular, the date of application and the date of posting. The date of application is included in the bibliographic reference to indicate when the author of the publication got acquainted with the cited work, which may have been subsequently changed. The posting date is especially relevant for alive online publications, the authors of which constantly keep their work up to date, eliminating the inaccuracies noticed and, most importantly, reflecting the latest achievements in the field under consideration. Here, the reader is particularly interested in the date of posting the latest, fresh version of the publication online. In an online publication, a fresh date can be obtained “on the fly” at the place of its posting and then dynamically embedded directly into the text of the bibliographic reference presented to the reader. This significantly increases the informative value of the reference. The implementation of a dynamic posting date is analyzed for a direct hyperlink to an alive publication, for a hyperlink via a DOI obtained from Crossref, and for a hyperlink to a preprint in arXiv.org.
Quality Attributes Demanded By Mobile App Stores On Mobile Apps Hosted On Their Platforms.
Authors: Kuria Jane , Anselimo Ikoha , Wabwoba Frankline
Published: September 2022

Mobile applications are designed and developed to run on a mobile device. The overwhelming adoption of mobile device technology, the rapid advancement of mobile devices and the significance of the Internet in today's society have shifted how businesses and consumers interact. The shift has subsequently upset mobile software programming enormously. The education sector has not been left behind on the adoption of mobile devices. For a mobile app to publication in an app store, the developers must meet the quality requirements of the store. To obtain the requirements, we surveyed four major app stores by leveraging the ISO/IEC 25010 quality standard to ensure the fulfillment of the quality requirements from the mobile app stores. We used the cross-sectional methodology strategy thus conducted the study within a limited time frame. Once an app is published in an app store, it becomes accessible to the entire universe of users. Mobile app developers should be familiar with the quality control requirements to develop acceptable apps. The purpose of this paper was to survey and identify the most relevant quality requirements set up by 
mobile applications The study found, Usability, Performance, Maintainability and Support categories were the most important