bluuebunny/crossref_metadata_2025 huggingface dataset:
A Review and Synthesis of TBPCC Evaluation in Canada: Looking Beyond the Quadruple Aim
Authors: Fletcher Sarah C. , Bellwood Paule , Hill Tiffany T. , Martin Susan , Ashe Maureen C. , Price Morgan
Published: March 2020

Background The objectives of this article are: 1. To synthesize peer-reviewed evidence on the outcomes of team-based primary and community care (TBPCC) in Canada on Patient and Provider Experience, Population Health, and Health Care Costs (Quadruple Aim); 2. To introduce the TBPCC Evaluation Framework; and 3. To extend the critical interpretive synthesis to include the additional four domains from the TBPCC Evaluation Framework (i.e., Relationship Centred Care, Care Process and Quality, Team Function and TBC Foundations). Methods We conducted a review of the following databases: Medline (OVID and PubMed), CINAHL, Embase, SportDiscus, and PsycINFO as well as an advanced search with Google Scholar (Title only) with the words “Canada AND primary AND team”. Review concepts included: population (patients), intervention (team-based primary health care), comparator (usual care, single practitioner delivery mode), outcome (patient and provider experience, population health, and health care costs), time (2000-present), and type (randomized controlled trials, controlled trials, quasi-experimental designs, and implementation studies/evaluations). We excluded reviews, opinion papers, laboratory-based studies, and studies based outside of Canada. Results Forty-five publications met our inclusion criteria with the majority of these (34) from Central Canada. Results were initially mapped to the domains of the Quadruple Aim, with 51% (23/45) aligning. The additional domains from the TBPCC Evaluation Framework (Team Function, Relationship Centred Care, Care Process and Quality and Team-Based Care Foundations) and the Team-Based Care (TBC) Adoption Model were integrated into the synthesis. 100% of the included articles reported outcomes that aligned with the TBPCC Evaluation Framework. Conclusion Across Canada, the value of relationships, shared understanding, communication, and coordination across teams are highlighted as is the potential of TBC to result in improvements in patient and provider experience, team function, and the quality of care. By encouraging a focus on formative as well as summative evaluation, the TBPCC Evaluation Framework provides a comprehensive approach to assessing the evidence needed to support actionable improvements for TBPCC in Canada. Trial Registration To identify peer-reviewed literature, we followed standard review methodology and reporting guidelines as established by PRISMA. We registered our review on PROSPERO (2018 CRD42018091086).
Older persons are more frail after an emergency care visit to the out-of-hours General Practitioner Cooperative in the Netherlands: a cross sectional descriptive TOPICS-MDS study
Authors: Bloemhoff Anneke , Schoon Yvonne , Smulders Kien , Akkermans Reinier , Vloet Lilian , Berg Karen van den , Berben Sivera
Published: March 2020

Background In the Netherlands community dwelling older people with primary care emergency problems contact the General Practitioner Cooperative (GPC) after hours. However, frailty remains often unobserved with the hazard of adverse health outcomes. The aim of this study was to provide insight in differences between older persons with or without GPC emergency care visits (reference group) regarding frailty and healthcare use.Methods A cross-sectional descriptive study design was based on data from the public data repository: The Older Persons and Informal Caregivers Survey Minimum Dataset (TOPICS-MDS). Frailty in older persons (65+ years, n=32,149) was measured by co-morbidity, functional and psychosocial aspects, quality of life and a frailty index. Furthermore, home care use and hospital admissions of older persons were identified. We performed multilevel logistic and linear regression analysis. A random intercept model was utilized to test differences between groups, and adjustment factors (confounders) were used in the multilevel analysis. Results Older persons with GPC contact were, compared to the reference group, more frail on the domain of co-morbidity (mean difference 0.52 ; 95% CI 0.47-0.57, p <0.0001), functional limitations (mean difference 0.53 ; 95% CI 0.46-0.60, p <0.0001), reported less emotional wellbeing (mean difference -4.10 ; 95% CI -4.59- -3.60, p <0.0001) and experienced less quality of life (mean difference -0.057 ; 95% CI -0.064- -0.050, p <0.0001). Moreover, older persons reported more often limited social function (OR 1.50, 95%CI 1.39-1.62, p <0.0001) and limited perceived health (OR 1.50, 95%CI 1.39-1.62, p <0.0001). Finally, older persons with GPC contact more often used home care (OR 1.37, 95%CI 1.28-1.47, p <0.0001) or were more often admitted to the hospital (OR 2.88, 95%CI 2.71-3.06, p <0.0001). Conclusions Older persons with out-of-hours GPC contact for an emergency care visit were significantly more frail on all domains, more likely to use home care or to be admitted to the hospital, compared to the reference group. Potentially frail older persons seem to require adequate identification of frailty, and support (e.g. advance care planning) before and after a contact with the out-of-hours GPC.
A broad-spectrum virus- and host-targeting antiviral peptide against SARS-CoV-2 and other respiratory viruses
Authors: Zhao Hanjun , To Kelvin K. W. , Sze Kong-Hung , Yung Timothy Tin-Mong , Bian Mingjie , Lam Hoiyan , Li Cun , Chu Hin , Yuen Kwok-Yung
Published: March 2020

The 2019 novel respiratory virus (SARS-CoV-2) causes COVID-19 with rapid global socioeconomic disruptions and disease burden to healthcare. The current COVID-19 and previous emerging virus outbreaks highlight the urgent need for broad-spectrum antivirals. Here, we showed that a defensin-like peptide P9R exhibited potent antiviral activity against pH-dependent viruses that require endosomal acidification for virus-host membrane fusion, including the enveloped coronaviruses (SARS-CoV-2, SARS-CoV and MERS-CoV), the pandemic A(H1N1)pdm09 virus, avian influenza A(H7N9) virus, and the non-enveloped rhinovirus. P9R could significantly protect mice from lethal challenge by A(H1N1)pdm09 virus and showed low possibility to cause drug-resistance virus. Mechanistic studies indicated that the antiviral activity of P9R depended on the direct binding to viruses and the inhibition of virus-host endosomal acidification, which provides a new concept that virus-binding alkaline peptides could broadly inhibit pH-dependent viruses. These results suggest that the dual-functional virus- and host-targeting P9R could be a promising candidate for combating pH-dependent respiratory viruses.Authors Hanjun Zhao, Kelvin K. W. To, and Kong-Hung Sze contributed equally to this work.
Fresh versus frozen single embryo transfer in Chinese women of advanced age undergoing IVF/ICSI: a study protocol for a randomized controlled trial
Authors: Chen Miaoxin , Wu Yuanyuan , Huang Xin , Liu Wenqiang , Li Wentao , Sun Chunyan , Meng Zhenzhen , Mol Ben W , Teng Xiaoming
Published: March 2020

Background: Elective frozen cleavage embryo transfer resulted in significantly higher live birth rate in patients with polycystic ovary syndrome but not in ovulatory women compared with fresh embryo transfer. Further, elective single frozen blastocyst transfer had significantly higher live birth rate in ovulatory women compared with single fresh blastocyst transfer. However, it is unknown whether single frozen cleavage embryo transfer results in higher cumulative live birth rate in women of advanced age undergoing in vitro fertilization (IVF) or intracytoplasmic sperm injection (ICSI). The aim of this study is to compare the effectiveness of frozen cleavage embryo transfer with fresh cleavage embryo transfer in Chinese women of advanced age. Methods: This study is a double-blind randomized controlled clinical trial (1:1 treatment ratio of frozen embryo transfer vs. fresh embryo transfer). A total of 840 women of advanced age with normal ovarian reserve undergoing the first cycle of IVF or ICSI will be enrolled and randomized into two parallel groups. Participants in group A will undergo frozen single cleavage embryo transfer, and participants in group B will undergo fresh single cleavage embryo transfer. The primary outcome is the cumulative live birth rate of the trial IVF/ICSI cycle within 12 months after randomization. This study is powered to detect an absolute difference of 8% (23% vs 15%) at the significance level of 0.05 and 80% statistical power based on a two-sided test. Discussion: The results of this study will provide evidence for the efficacy and safety of frozen cleavage embryo transfer compared with fresh cleavage embryo transfer in women of advanced age undergoing IVF/ICSI. Trial registration: Chinese Clinical Trial Registry, ChiCTR2000029330. Registered on 25 Jan 2020. Keywords: Frozen embryo transfer, advanced age, in vitro fertilization (IVF), intracytoplasmic sperm injection (ICSI), live birth, randomized controlled trial.
Qualidade de vida no trabalho e vínculos organizacionais: Proposição de um modelo integrativo e perspectivas de pesquisas
Authors: Vital Mirian Serrão , de Paiva Kely César Martins
Published: March 2020

Este ensaio tem como propósito refletir sobre os construtos Qualidade de Vida no Trabalho e Vínculos Organizacionais (Comprometimento, Entrincheiramento e Consentimento), propor um modelo integrativo e indicar possibilidades de pesquisas. O referencial teórico reflete sobre tais construtos (HACKMAN; OLDHAM, 1975; MEYER; ALLEN, 1991; RODRIGUES; BASTOS, 2010; RODRIGUES, 2011; SILVA, 2013). A partir do modelo proposto, traçou-se uma agenda de pesquisa que abraçou aspectos metodológicos (abordagens qualitativas para maior compreensão dos temas e suas inter-relações, e abordagens quantitativas com vistas à extensão de conclusões) e conexões conceituais e temáticas (com outros construtos aderentes ao campo do comportamento organizacional), a qual pode contribuir para o debate integrado dos construtos, ora ainda não realizado. O cumprimento de tal agenda visa colaborar tanto conceitual/academicamente, ao buscar a compreensão e delimitação dos temas, como prática/profissionalmente, fornecendo subsídios para adequadas práticas organizacionais no mundo do trabalho.
Implantação do sistema de informação do Programa Nacional de Imunizações Desktop
Authors: Cardoso Werton dos Santos , Nascimento Luciana de Cassia Nunes , Dias Fernanda Moura Vargas
Published: March 2020

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Estreptococos do grupo mutans na saliva e placa de pacientes com aparelho ortodôntico ortopédico: contribuição ao estudo clínico-microbiológico
Authors: Shigetomi M. N. , Brêtas S. M. , Campos D. M. K. S. , Fonseca L. , Ito I. Y.
Published: March 2020

Aparelho ortodôntico ortopédico; Estreptococos do grupo mutans; Saliva; Placa.
Tracionamento dental em traumatismos: relato de caso
Authors: Carvalho R. B. , Gaigher J. T. , Roldi A. , Coutinho J.
Published: March 2020

Fratura subgengival; Invasão do espaço biológico; Tracionamento dental.
Dieta e higienização bucal como preditores da cárie dental na primeira infância
Authors: Fadel C. B. , Kozlowski Jr V. A.
Published: March 2020

Dieta; Higiene bucal; Cárie dental.
A problemática da responsabilidade individual na saúde pública em Portugal
Authors: Araújo Joana , Carvalho Mônica , Gomes Carlos Costa , Jácomo António
Published: March 2020

Introdução: A prevenção em saúde é o principal mote da Organização Mundial de Saúde (OMS) e há muitas décadas é já aplicada nas acções de saúde pública de todos os países da União Europeia, inclusive Portugal. Objetivo: Discutir a questão da responsabilidade social e individual no actual cenário da Saúde Pública em Portugal, face a uma proposta política de possível abandono de um modelo de responsabilidade partilhada na saúde pública. Métodos: Este estudo aborda o Estado social e saúde verificadas ao longo das últimas décadas na Europa e em Portugal, discute a Ética e saúde pública cujas acções se situam na intersecção entre Riscos, Efeitos na Saúde e Prevenção, dicerne a Responsabilidade individual e social que emergem dos valores que orientam ou deveriam orientar as nossas relações com os outros, debate a Justiça e direito à saúde acom base na realidade da saúde em Portugal, que parece ser um dilema ético para quem toma decisões acerca do estabelecimento de prioridades no uso dos recursos financeiros. Resultados: O estudo relatou que a atual situação das finanças públicas, especialmente em Portugal, deveria remeter para a busca de novas perspectivas em que a participação de todos os agentes de saúde torna-se indispensável; em particular médicos, enfermeiros e outros técnicos, no sentido de apresentarem as suas posições quanto aos modos como desejam exercer a sua atividade profissional, numa clara definição de direitos e de deveres. Conclusão: Ressalta-se a necessidade de o Estado, com o empenho dos profissionais de saúde, estabelecer os princípios políticos, financeiros e clínicos para um plano de saúde eficiente e eficaz.
Anomalia de desenvolvimento dos côndilos mandibulares: relato de quatro casos
Authors: Fagundes Zilda , Emmerich Adauto
Published: March 2020

Côndilo; Côndilo Bífido; Côndilo duplo; Articulação temporomandibular; Mandíbula.
A visão das gestantes quanto às condutas odontológicas na cidade de Franca (SP)
Authors: Maeda Fernanda H. I. , Toledo Lucienne P. , Pandolfi Margareth
Published: March 2020

Gestantes; Hábitos.
Posição dos cirurgiões-dentistas em relação ao selamento da superfície oclusão
Authors: Sales Cunha Cristiane B. C. , Armada Luciana , Monte Alto Luciane
Published: March 2020

Odontopediatria; Selantes de fóssulas e fissuras; Biofilme; Prevenção.
Efeitos a longo prazo da terapia oncológica realizada em crianças
Authors: Kanno Cláudia Misue , Piazzetta Cleto Marisvaldo , Biazzolla Éder Ricardo
Published: March 2020

Radioterapia; Quimioterapia; Criança; Efeitos a longo prazo.
The Microbiome: A Reservoir to Discover New Antimicrobials Agents
Authors: Boutin Sébastien , Dalpke Alexander H.
Published: March 2020

Nature offered mankind the first golden era of discovery of novel antimicrobials based on
the ability of eukaryotes or micro-organisms to produce such compounds. The microbial world proved
to be a huge reservoir of such antimicrobial compounds which play important functional roles in every
environment. However, most of those organisms are still uncultivable in a classical way, and therefore,
the use of extended culture or DNA based methods (metagenomics) to discover novel compounds
promises usefulness. In the past decades, the advances in next-generation sequencing and bioinformatics
revealed the enormous diversity of the microbial worlds and the functional repertoire available for
studies. Thus, data-mining becomes of particular interest in the context of the increased need for new
antibiotics due to antimicrobial resistance and the rush in antimicrobial discovery. In this review, an
overview of principles will be presented to discover new natural compounds from the microbiome. We
describe culture-based and culture-independent (metagenomic) approaches that have been developed to
identify new antimicrobials and the input of those methods in the field as well as their limitations.
Formulation Development of Tamoxifen Loaded Lipid Nanoparticle by Taguchi (L12 (211)) Orthogonal Array Design
Authors: Poovi Ganesan , Damodharan Narayanasamy
Published: March 2020

Background:

A better understanding of the biopharmaceutical and physicochemical
properties of drugs and the pharmaco-technical factors would be of great help for developing pharmaceutical
products. But, it is extremely difficult to study the effect of each variable and interaction
among them through the conventional approach.

Methods:

To screen the most influential factors affecting the particle size (PS) of lipid nanoparticle
(LNPs) (solid lipid nanoparticle (SLN) and nanostructured lipid carrier (NLC)) for poorly watersoluble
BCS class-II drug like tamoxifen (TMX) to improve its oral bioavailability and to reduce its
toxicity to tolerable limits using Taguchi (L12 (211)) orthogonal array design by applying computer
optimization technique.

Results:

The size of all LNPs formulations prepared as per the experimental design varied between
172 nm and 3880 μm, polydispersity index between 0.033 and 1.00, encapsulation efficiency between
70.8% and 75.7%, and drug loading between 5.84% and 9.68%. The study showed spherical
and non-spherical as well as aggregated and non-aggregated LNPs. Besides, it showed no interaction
and amorphous form of the drug in LNPs formulation. The Blank NLCs exhibited no cytotoxicity
on MCF-7 cells as compared to TMX solution, SLNs (F5) and NLCs (F12) suggest that the
cause of cell death is primarily from the effect of TMX present in NLCs.

Conclusions:

The screening study clearly showed the importance of different individual factors
significant effect for the LNPs formulation development and its overall performance in an in-vitro
study with minimum experimentation thus saving considerable time, efforts, and resources for further
in-depth study.
Clinical Assessment of Nutritional and Metabolic Status in HIV Outpatients
Authors: Emerole Karl , Kozhevnikova Galina , Isakov Vasily , Voznesenskiy Sergey , Konnov Vladislav , Pilipenko Vladimir , Golub Veniamin , Polovinkina Nadezda , Barysheva Irina , Kharlamova Tatiana , Konnov Danila
Published: March 2020

Background:

After the World Health Organization’s first technical consultation on Nutrient Requirements for People Living with HIV/AIDS in Geneva, 2003, a lot of research questions that are considered crucial for enhancing our understanding of the interaction of nutrition and HIV infection were raised and until this moment, left unanswered. To gain a better understanding of HIV and nutrition, we implemented a comprehensive approach. The aim of our study was to assess the nutritional and metabolic status in order to enhance the provision of medical care to people living with HIV.

Methods:

45 HIV patients and 32 healthy volunteers were enrolled in the study. Within the HIV group, 32 (71%) were male and 13 (29%) female. Only 7 (15%) were ART naïve. Overall their median age, CD4 count and viral load were 30 years (IQR: 28-40), 407 (IQR: 357-490) cells/mm3 and 500 (IQR: 0-1000) copies/ml, respectively. None of the participants in the HIV group had any active infection. Food intake by monthly dietary recall was determined. Body composition was measured using bioelectrical impedance analysis. The selected biochemical parameters were evaluated and the resting metabolic rates were calculated using indirect calorimetry to accurately understand the metabolism of participants.

Results:

Participants in the HIV group did not meet the recommended daily allowance level (RDA) of carbohydrate requirements. The fat-free mass significantly decreased in the HIV group (P < 0.05). Resting energy expenditure was excessive in the HIV group compared to the control group (P < 0.05). Values of urea nitrogen concentration, fat and protein oxidation rates in the HIV group significantly increased (P < 0.01). The carbohydrate oxidation in the HIV group significantly decreased (P < 0.01)

Conclusions:

The study reveals a catabolic status in the HIV group and suggests an adjustment in the nutrient RDA to compensate such status. Further investigation should be extended to vulnerable population group particularly children.
Historical Development of Spatial Modulation and Massive MIMO Communication System with Implementation Challenges: A Review
Authors: Sharma Anuj Kumar , Sharma Vipul , Kapoor Kamal
Published: March 2020

:

For wireless communication networks, massive MIMO (Multiple-Input Multiple-
Output) technology has been considered a major achievement. MIMO Technology consists of
equipping a base station with a large number of antennas to serve many active users. Through
MIMO Technology, the ability to concentrate on transmitted signal energy in very short spaces
would result in huge increases in system capacity. While this new concept provides some fascinating
benefits, it creates a new tension that has drawn both academia and industry attention. Channel
state information acquisition, channel feedback, instant reciprocity, statistical reciprocity, architecture
and hardware impairments are few of them. This paper presents a survey on Spatially
Modulated Massive MIMO's historical development.
Moving Towards Meaningful and Significant Family Partnerships in Education
Authors: Garbacz S. Andrew , Minch Devon R. , Jordan Phoebe , Young Kaitlyn , Weist Mark D.
Published: March 2020

Background:

Partnerships with families in education settings should emphasize
their roles as active and engaged co-equal partners. However, common practices in schools
are to involve families at school-based events and share information with them about their
child’s education in a manner that does not promote two-way interactions.

Objective:

The objectives of this paper are to describe relevant background on familyschool
connections; approaches to promote academic performance and mental and behavioral
health; and a framework to organize family partnerships that support all youth across a
continuum of support intensity.

Methods:

A review based on the relevant family-school partnership and systems change literature
was conducted. The review focused on prevention, tiered approaches that provide a
continuum of support to students, and partnership-centered family engagement.

Results:

Research supports family-school partnerships in a tiered prevention framework. A
theory of change was developed to depict the impact of family partnerships on proximal and
distal outcomes.

Conclusion:

Implications suggest a need for partnership-centered approaches to school reform
in state and federal policy to support investments in school and district initiatives. Initiatives
should embed culturally sensitive practices so that all children can thrive. Future directions
for investigating effective approaches for family partnerships are described.
Current Research and Patents of Polymer Foaming
Authors: Lu Hongwei , Wang Jiankang
Published: March 2020

Background:

Since the rapid development of polymers in the 1920’s, polymer products have
become a necessary part of people's lives. Supercritical fluid technology was gradually introduced in
this field. With the emergence of new technologies, methods, and equipment, the supercritical fluid
technology has rapidly developed in the field of polymers and displayed a broad application perspective.

Objective:

The research progress of supercritical fluid-assisted polymer foaming, including equipment
improvement, polymer composition ratio, and foaming process, and the influence of these processes on
polymer foaming materials is reviewed here.

Methods:

Patents and research progress of supercritical fluid assisted polymer foams were reviewed.
The advantages and disadvantages of various patents are analyzed in terms of cell structure, mechanical
properties, surface quality, processing performance, and cost.

Results:

The foaming equipment and the manufacturing process of polymer foaming materials were
retrospected, in order to improve the quality and application prospect of foaming composites.

Conclusion:

The preparation technology of supercritical fluid polymer foams has attracted wide attention.
In recent years, patented technology has enabled us to use the supercritical fluid polymer foaming
materials. There are some problems in the supercritical fluid foaming in terms of mechanical properties,
cell structure, cell size, and processing technology, therefore, more equipment and patents are needed to
solve these problems in the future.
Agroquímico, Biocida, Pesticida, Plaguicida e Producto Fitosanitario. Uma pesquisa com Corpus
Authors: Cereser Mauren Thiemy Ito , Bevilacqua Cleci Regina
Published: March 2020

O objetivo deste trabalho é demonstrar a utilização de corpora à luz dos princípios teórico-metodológicos da Linguística de Corpus no estabelecimento da equivalência do termo agrotóxico em espanhol. São estudados os termos: agroquímico, biocida, pesticida, plaguicida, producto fitosanitário e agrotóxico, conforme empregados no cenário de leis ambientais do Brasil e dos países hispânicos. Para tanto, foram seguidas as seguintes etapas: a) busca das definições dos termos em dicionários e glossários especializados; b) constituição de corpora com textos legais de países hispanofalantes para cada um dos termos; c) coleta de contextos utilizando o AntConc; d) busca de traços definitórios; e) elaboração de mapas conceituais; f) identificação dos equivalentes. Fazem parte do quadro teórico desta pesquisa a Teoria Comunicativa da Terminologia (Cabré 1999), a Linguística de Corpus (Berber Sardinha 2004), a Equivalência Funcional (Gémar 1998).
The Observation of Sensory Design in Open Spaces of University Campus under Hot-humid Climate
Authors: Fan Mengjia , Jamaludin Adi Ainurzaman , Hussein Hazreena
Published: March 2020

This paper aims to explore the current sensory design of open spaces surrounding educational buildings. Observation of sensory landscape variables is conducted to investigate the potential of supporting outdoor experience. The expected key findings include the functional design and the stimulated multi-senses in the presence of university campuses under a hot-humid climate. In recommendation, the conjunction of behavioural mapping and questionnaire surveys in future studies may lead to more findings of the interaction of users' behaviours and activities, as well as the correlations between sensory stimulation, environmental satisfaction, and outdoor experience.Keywords: Sensory stimulation; outdoor experience; open space; university campuseISSN: 2398-4287 © 2020. The Authors. Published for AMER ABRA cE-Bs by e-International Publishing House, Ltd., UK. This is an open access article under the CC BYNC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/). Peer–review under responsibility of AMER (Association of Malaysian Environment-Behaviour Researchers), ABRA (Association of Behavioural Researchers on Asians) and cE-Bs (Centre for Environment-Behaviour Studies), Faculty of Architecture, Planning & Surveying, Universiti Teknologi MARA, Malaysia.DOI: https://doi.org/10.21834/e-bpj.v5i13.2043
Dez anos da Revista Ciências em Saúde
Authors: De Moraes Silva Melissa Andreia , Jesus-Silva Seleno Glauber de , Reis José Marcos dos , Cardoso Rodolfo S.
Published: March 2020

Em 2020 a Revista Ciências em Saúde (RCS) completará sua primeira década. Ao olhar para trás e analisar todo o legado deixado podemos perceber a sua grande evolução em qualidade neste período.  É necessário, inicialmente, registrar nossos sinceros agradecimentos ao Editor fundador Prof. Dr. Rodolfo S. Cardoso, idealizador deste projeto e aos Editores-Eméritos da RCS, Prof. Dr. Kleber Lincoln Gomes, Prof. Dra. Maria Christina Anna Grieger (in memorian) e Prof. Dr. Marco Túlio Barcellos de Assis Figueiredo (in memorian). Sem a atuação incisiva dessas pessoas esse projeto jamais teria sido possível.
Исследование свойств двумерных пленок МоS-=SUB=-2-=/SUB=- и WS-=SUB=-2-=/SUB=-, синтезированных химическим газофазным методом
Authors: Смагулова С.А. , Винокуров П.В. , Семенова А.А. , Попова Е.И. , Васильева Ф.Д. , Образцова Е.Д. , Федотов П.В. , Антонова И.В.
Published: March 2020

Abstract Molybdenum- and tungsten-disulfide films are synthesized by chemical-vapor deposition. The set of optimal synthesis parameters (temperature, time, and amount and ratio of precursors) is established at which MoS_2 domains with maximum lateral sizes of up to 250 μm on sapphire and MoS_2 and WS_2 domains up to 80 μm in size on SiO_2 can be grown. Domain intergrowth leads to the formation of homogeneous single-layer MoS_2 films. The Raman spectra of the synthesized films contain two characteristic peaks corresponding to the atomic vibrations in MoS_2 and WS_2. Photoluminescence of the single-layer and bilayer MoS_2 films with a maximum intensity of 670 ± 2 nm and of the single-layer WS_2 films with a maximum intensity of 630 ± 2 nm is detected. The photoluminescence spectral maps (the dependences of the photoluminescence intensity on the luminescence and excitation-light wavelengths) are measured. According to the measured data, the photoluminescence excitation spectrum of MoS_2 has a maximum at 350 ± 5 nm and the photoluminescence excitation spectrum of WS_2 has a maximum at 330 ± 5 nm. The I – V characteristics of the synthesized films are photosensitive in the visible spectral range.
Фрустрация обменно-стрикционного сегнетоэлектрического упорядочения и рост электрической поляризации областей фазового расслоения в твердых растворах R-=SUB=-0.8-=/SUB=-Ce-=SUB=-0.2-=/SUB=-Mn-=SUB=-2-=/SUB=-O-=SUB=-5-=/SUB=- (Er, Tb)
Authors: Ханнанов Б.Х. , Головенчиц Е.И. , Санина В.А.
Published: March 2020

The effect of rare-earth ions (R = Er^{3+}, Tb^{3+}, Ce^{3.75+}) on the dielectric properties and electric polarization induced by the local polar phase separation domains in solid solutions of multiferroics R_{0.8}Ce_{0.2}Mn_2O_5 (R = Er, Tb) is studied. A qualitative difference between these parameters and the previously studied in initial RMn_2O_5 crystals (R = Er, Tb) was found. It has been shown that the properties of the polar phase separation domains that arise in the subsystem of Mn^{3+} and Mn^{4+} ions due to the finite probability of tunneling of electrons between these ions substantially depend on the magnitudes of the crystal fields in which these domains are located. It was shown that the combined effect of E^{r3+}, Tb^{3+}, and Ce^{3.75+} ions significantly changes the crystal field in R_{0.8}Ce_{0.2}Mn_2O_5 (R = Er, Tb) compared to RMn_2O_5 (R = Er, Tb).
Исследование влияния постоянного электрического поля на диэлектрические свойства LiNbO-=SUB=-3-=/SUB=-
Authors: Яценко А.В. , Кострицкий С.М.
Published: March 2020

The effect of a strong electric field on the dielectric properties of nominally pure LiNbO3 crystals of congruent composition in the low-frequency region is experimentally investigated. It is shown that an external static electric field, directed along or antiparallel to the polar axis of the crystal, as well as a field of pyroelectric nature at a field strength of up to 14 kV / cm within the error does not affect the dielectric properties of the crystal in the low frequency range.
Фотоэлектрические поля и особенности вторичной структуры номинально чистых кристаллов ниобата лития, выращенных из шихты, легированной бором
Authors: Сидоров Н.В. , Теплякова Н.А. , Титов Р.А. , Палатников М.Н.
Published: March 2020

Показано, что применение для выращивания номинально чистых кристаллов ниобата лития расплава, структурированного неметаллическим элементом бором, позволяет регулировать особенности вторичной структуры, оптическую однородность, величины фотоэлектрических полей и ширину запрещенной зоны. По характеристикам фотоиндуцированного рассеяния света определены напряженности фотовольтаического и диффузионного полей в номинально чистых кристаллах LiNbO3:В. Показано, что величина диффузионного поля, определяющая концентрацию мелких электронных ловушек, для кристаллов LiNbO3:В имеет промежуточное значение между кристаллами конгруэнтного и стехиометрического составов и зависит от концентрации бора в шихте. При этом ширина запрещенной зоны в кристаллах LiNbO3:В соответствует значению для стехиометрического кристалла, но оптическая однородность кристаллов LiNbO3:В близка к оптической однородности конгруэнтного кристалла, концентрация ОН-групп в кристаллах LiNbO3:В меньше, а их расположение в структуре более упорядочено, чем в конгруэнтном кристалле. Ключевые слова: ниобат лития, расплав, фотоэлектрические поля, ИК-спектроскопия, оптическая спектроскопия.
Капиллярная неустойчивость цилиндрической струи феррожидкости, находящейся в однородном продольном магнитном поле
Authors: Коровин В.М.
Published: March 2020

In this article a ferrofluid jet located inside a solenoid is considered. The jet is modeled by a cylindrical volume of incompressible inviscid fluid moving at a constant velocity parallel to the axis of the cylinder. The axes of the jet and the solenoid coincide. The variation of the strength of the magnetic field generated by the solenoid is allowed from very small to experimentally achievable maximal values. We investigate the influence of the magnetic forces on the growth rate and the wavelength of the most rapidly growing perturbations of the jet surface shape.
Автоволновая пластичность. Принципы и возможности
Authors: Зуев Л.Б. , Баранникова С.А.
Published: March 2020

Рассмотрены основные понятия автоволновой модели развития локализованного пластического течения твердых тел разной природы. Показано, что на всем протяжении процесса пластическая деформация развивается локализованным на макромасштабном уровне образом. При этом форма наблюдаемых паттернов локализации связана со стадиями деформационного упрочнения материала. Паттерны являются проекциями различных мод автоволн локализованного пластического течения на поверхность наблюдения. Введен упругопластический инвариант деформации, который рассматривается как основное уравнение автоволновой модели пластичности, и обсуждена его физическая природа. Ключевые слова: деформация, пластичность, дефекты, локализация, упрочнение, автоволны.
Влияние начальной температуры на процесс проникания ударников из пористого сплава на основе вольфрама с упрочняющим наполнителем в стальную преграду
Authors: Ищенко А.Н. , Афанасьева С.А. , Белов Н.Н. , Буркин В.В. , Касимов В.З. , Марцунова Л.С. , Рогаев К.С. , Саммель А.Ю. , Скосырский А.Б. , Югов Н.Т.
Published: March 2020

A researches series aimed at studying the features and revealing the general laws of penetration of impactors made of composite material based on a porous tungsten + nickel + iron + cobalt alloy with the addition of highly hard refractory particles of tungsten carbide under various initial conditions was continued. In particular, the effect of the initial impactor temperature in the range from −50 to 50 °C on the process of penetration into the steel shield by the experimental and computational methods was studied. The absence of appreciable effect initial impactor temperature in this range for the penetration depth into the shield at impact velocities of 2500 m/s was revealed. The penetration is exceeded by 20% compared with the monolithic mass-size analog of the WNiFe-90 alloy.
Влияние усиленной электрическим полем термической электронной эмиссии на температуру катода с тонкой диэлектрической пленкой в дуговом газовом разряде
Authors: Бондаренко Г.Г. , Дубинина М.С. , Кристя В.И.
Published: March 2020

A model of thermal electron emission enhanced by the electric field (thermo-field emission) from the metal cathode substrate into a thin insulating film formed on its surface is developed. A system of equations for the cathode surface temperature in the arc discharge and the electric field strength in the film, providing the required discharge current density, is formulated. It is shown that existence of the dielectric film can result in a considerable reduction of the cathode temperature in the discharge due to lower potential barrier height at the metal-insulator boundary than at the metal-discharge boundary in case of the metal cathode without the film. It is found that due to an enhancement of thermal emission of electrons into the film by the electric field generated in it, an additional decrease of the cathode temperature by about 100 K takes place.
Особенности измерения поверхностного распределения электрического потенциала локальным зондом на основе полевого транзистора с каналом-нанопроводом
Authors: Божьев И.В. , Крупенин В.А. , Преснов Д.Е. , Циняйкин И.И. , Дорофеев А.А. , Трифонов А.С.
Published: March 2020

The non-destructive method of scanning probe microscopy for simultaneous measurement of surface topography and distribution of the electric field (charge, potential) is demonstrated. The surface is scanned by the tuning fork method, the interaction with the surface is carried out by the sharp edge of the silicon chip mounted on one of the legs of the quartz resonator. The detection of electric potentials was carried out using a field-effect transistor with a nanowire channel formed at the tip of the probe. Due to the low quality factor of the oscillatory system, scanning by standard algorithms of probe movement above the surface led to rapid wear and even destruction of the tip of the probe. An original scanning algorithm was developed that minimizes the interaction time between the probe and the object under study. The minimum time at each scanning surface point was 1.0-1.6 ms - this time was determined
by the response time of the field-effect transistor to a change in the detected electric field (the measurement time for one scan was 20-30 min). The spatial resolution of the method was 10 nm and 20 nm for measuring the topography and field profile of the sample, respectively. The field resolution of the fabricated chips was in the range of 2-5 mV and was determined by the sensitivity of the
nanowire of the field effect transistor and the distance from the nanowire to the tip of the probe.
Квантовая теория эмиссии электронов из структуры "металл-диэлектрик" в сильных электрических полях
Authors: Берил С.И. , Баренгольц С.А. , Баренгольц Ю.А. , Старчук А.С.
Published: March 2020

A generalized formula is derived for the electron emission current in relation to the temperature, the electric field, and the electronic work function for a “metal–dielectric” system. The formula takes into account the quantum nature of the image forces. In deriving it, the Fermi–Dirac distribution and the quantum image potential obtained in terms of the electron–polaron theory are used. In the limit of the classical potential of image forces, the well-known Richardson–Schottky and Fowler–Nordheim formulas are obtained for thermionic emission and field emission, respectively. It is shown that at high temperatures and electric fields E ≥ 10 MV/cm, the polaron contribution to the electron emission current increases with increasing field and decreases with increasing temperature. The decrease in current is related to an increase in effective electronic work function due to the electron-polaron effect. Extrapolation formulas convenient to obtain theoretical estimates are derived for the thermionic and the field emission current.
Анализ эффективностей процессов захвата электронов ионами в ридберговские состояния и неупругих переходов n n-=SUP=--=/SUP=- в плазме смесей инертных газов
Authors: Кислов К.С. , Нариц А.А. , Лебедев В.С.
Published: March 2020

We have carried out the comparative analysis of the efficiencies of resonant and non-resonant mechanisms of electron capture by ions into Rydberg states of atoms, Xe(n), and the inelastic n → n′ transitions between the highly-excited states in the plasmas of rare gas mixtures, Rg/Xe, containing atomic, Xe$^{+}$, and molecular, RgXe$^{+}$ and Xe$_{2}^{+}$, ions (Rg = Ne, Ar and Kr, [Xe]≪[Rg]). The rate constants of resonant electron capture by Xe$^{+}$ ions in ternary collisions with rare gas atoms, Rg($^{1}S_{0}$), and dissociative recombination of heteronuclear, RgXe$^{+}$, and homonuclear, Xe$_{2}^{+}$, ions were evaluated on the basis of the original approach within the framework of the theory of non-adiabatic transitions between electronic terms of RgXe$^{+}+e$ system. For the alternative mechanism of the three-body electron capture by Xe$^{+}$ ions in collisions with Ne, Ar and Kr atoms the calculations of the rate constants were carried out in the impulse approximation by taking into account both short-range and polarization electron-atom interactions. The rate constants of the three-body electron capture by ions and n → n′ transitions in collisions with electrons were calculated on the basis of the well-known theoretical models. We have determined the ranges of plasma ionization degree and electronic and gas temperatures as well as the principal quantum number of Xe atom which correspond to situations when the resonant free-bound and bound-bound transitions of electron play a key role.
Оптические характеристики наночастиц для эффективного ослабления излучения черного тела с температурой 2000-4000 градусов Кельвина
Authors: Пустовалов В.К. , Астафьева Л.Г.
Published: March 2020

Исследованы возможности использования наночастиц для эффективного ослабления оптического излучения от различных природных или технологических источников (пожары, электрометаллургия, лазерная и плазменная обработка) с температурой поверхности излучателя в интервале 2000-4000 K на основе компьютерного моделирования. Излучение от вышеперечисленных источников может быть представлено как излучение черного тела с соответствующей температурой. Проведены исследования и анализ оптических характеристик двухслойных SiO2-Au- и Fe3O4-Au-наночастиц систем ядро-оболочка в диапазоне радиусов 25-300 nm с толщиной оболочки 5 и 10 nm для длин волн излучения в спектральном интервале 200-500 nm. SiO2-Au- и Fe3O4-Au-наночастицы являются хорошими ослабителями (поглотителями) излучения с температурой 2000-4000 K в диапазоне оптического спектра 200-5000 nm и могут применяться в качестве возможных кандидатов для эффективного ослабления оптического излучения высокотемпературных источников. Ключевые слова: двухслойные наночастицы, оптические свойства, излучение, анализ, ослабление.
Исследование электрофизических свойств коллоидных квантовых точек антимонида индия
Authors: Михайлов А.И. , Кабанов В.Ф. , Гавриков М.В.
Published: March 2020

Abstract The mechanisms of current transport through indium antimonide quantum dots (QDs) have been examined by analyzing normalized differential tunneling current–voltage characteristics. Electron tunneling with the discrete spectrum of QDs taken into account has been studied. The positions of the first three levels of their electronic spectrum have been estimated. It has been demonstrated that the mechanism of the observed field emission from a film structure of colloidal indium antimonide QDs is characterized adequately by the Morgulis–Stratton theory in the range of electric-field intensities corresponding to the experimental conditions.
Корректность определения характеристик перемежающейся обобщенной синхронизации при использовании только одной переменной ведомой и вспомогательной систем
Authors: Короновский А.А. , Москаленко О.И. , Сельский А.О.
Published: March 2020

Method for detection of characteristic phases of behavior in the intermittent generalized synchronization regime based on the use of an auxiliary system is considered. It is found that for the correct determination of the type of intermittency realized in the system, it is sufficient to use the only one variable characterizing the state of this system.
Вклад газов остаточной атмосферы в поток коллективно ускоренных протонов в диоде Люса
Authors: Рыжков В.А. , Ремнев Г.Е. , Пятков И.Н. , Журавлев М.В.
Published: March 2020

Contribution of gases of residual atmosphere on number of protons collectively accelerated in Luce diode was determined by comparison of the number of protons generated with polyethylene and boron nitride anodes. The proton average number and energy were determined by a use of the radioactivation diagnostics via nuclear reactions 10B(p,α)7Be and 12C(p,γ)13N. It was found that the number of protons collectively accelerated due to adsorption of water vapors and hydrocarbons from the residual camera atmosphere can be comparable with the number of protons accelerated due to sublimation of surface of the polyethylene anode.
Высокоселективный полосковый фильтр нижних частот с уровнем заграждения более 100 dB в широкой полосе
Authors: Беляев Б.А. , Сержантов А.М. , Лексиков Ан.А. , Бальва Я.Ф. , Грушевский Е.О. , Ходенков С.А.
Published: March 2020

A new miniature strucuter of a highly selective low-pass filter (LPF) on a suspended substrate with a double-sided topology of stripline conductors has been proposed. The steepness of the slope of the frequency response of the filter and the depth of the stopband are determined by the zeros of the transmission coefficient, which number is equal to the order of the filter. The synthesis of a fifth-order low-pass filter prototype on a 0.5-mm thick alumina substrate with a relative permittivity εr = 9.8 was performed by numerical electrodynamic analysis of its 3D model. The filter passband cut-off frequency at the level of –1 dB fc = 1.75 GHz, and the length of the stopband at the −100 dB level extends to a frequency of 4.4 fc.
Исследование релаксационных и переходных процессов в сегнетопьезокерамике с использованием метода импедансной спектроскопии
Authors: Швецов И.А. , Луговая М.А. , Швецова Н.А. , Петрова Е.И. , Рыбянец А.Н.
Published: March 2020

A new method for studying relaxation and transient processes in ferroelectric ceramics under the influence of dc electric field is proposed. Precision measurements of time dependences of complex dielectric constants of ferroelectric ceramics in the region of weak electric fields were carried out using the method of impedance spectroscopy. A comparative analysis of various methods for characterization of relaxation processes in ferroelectric ceramics is carried out. A physical interpretation of the results is proposed.
Влияние предварительного динамического нагружения на усталостную долговечность сплава АМг6
Authors: Билалов Д.А. , Оборин В.А. , Наймарк О.Б. , Нарыкова М.В. , Кадомцев А.Г. , Бетехтин В.И.
Published: March 2020

An experimental study of the influence of preliminary dynamic loading on the endurance limit of an AlMg6 alloy based on 109 cycles was carried out. It is shown that when loading to a strain of 10% with a strain rate of 103 s-1, the endurance limit decreases by 22%. A mathematical model is proposed that is able to adequately predict fatigue failure, including after preloading.
In vitro Efficacy of Deltamethrin against Hyalomma anatolicum anatolicum
Authors: Thakur Pratibha , Bagherwal R K , Jayraw A K , Soni A K
Published: March 2020

Tick and tick-borne diseases such as theileriosis,babesiosis, and Anaplasmosis pose a constant threato cattle health. Rhipicephalus (Boophilus) microplus andHyalomma anatolicum are the most commonly foundcattle tick species and cause significant economic lossesto dairy and leather industries by adversely affecting themilk production and quality of hides. Tick control strategyinvolves mainly the use of synthetic acaricides which resultsin the development of acaricide resistance. Deltamethrinacts on the parasites by contact and has strong lipophilicaction thus penetrates the cuticle nerve ganglion and block the motor activity. The presentstudy was aimed at the determination of in vitro efficacyof Deltamethrin against H. anatolicum ticks collected fromhealthy cattle of college farm and nearby dairy farms.
Abattoir Survey of Genital Abnormalities in Jaffrabadi Buffaloes
Authors: Vala1 K B , Solanki G B , Fefar D T , Borakhatariya D , Raval R J
Published: March 2020

The present study was conducted to address the prevalence and type of pathological conditions in genitalia of 100 culled Jaffrabadi buffaloes (Bubalus bubalis). Out of 100 reproductive tracts examined, 24 were normal and 76 had gross abnormalities. Among the 184 affections observed, either single or multiple, the cervical affections were found to be the maximum 84 (45.65%) followed by uterus50 (27.17%), ovary and bursa 29 (15.76%), fallopian tube 16 (8.70%) and vagina 5 (2.71%). Out of 50 uterii examined for the histological lesions, endometritis was observed to the extent of 72 % (36 genitalia). Based on histopathological findings, uterine lesions were classified as an acute (13.89%, n = 5), subacute (19.45%, n = 7) and chronic (66.67%, n = 24) endometritis. Among the oviducts, 16 (8.70%) tubal affections were noticed to be of salpingitis. Of these, mild (+), moderate (++) and severe (+++) degree of salpingitis was found in 3 (18.75%), 4 (25.00%) and 9 (56.25%) fallopian tubes, respectively. Biometrically, right side ovary, fallopian tube as well as uterine horn were found to be larger than the respective left organs. The study concluded that about half of the culled Jaffrabadi buffaloes haveacquired cervical affections, therefore it is recommended that care should be taken while doing AI or clinical handling of the female genitalia, which can adversely affect the fertility status of animals.