bluuebunny/crossref_metadata_2025 huggingface dataset:
Modelo Sistémico de Mejora Continua para la optimización de procesos comerciales en empresas de telecomunicaciones: caso Grupo Visión Perú.
Authors: Illescas Meza Ricardo Jhunior
Published: March 2018

El objetivo de la investigación es la descripción de los procesos comerciales existentes en el Grupo Visión Perú, representando el "que" y el "como" se realizan los procesos, basados en componentes sociales, comerciales, de atención y de tiempo.  Metodología: El diseño de la investigación es no experimental, es descriptivo ya que describe los cambios generados a partir de la implementación del Modelo Sistémico de Mejora Continua para optimizar los procesos comerciales. Se llevó a cabo un seguimiento del plan de mejoras aplicada a la realidad, validado por la estadística global de crecimiento y el plan estratégico del caso Grupo Visión Perú. Al culminar las 7 fases se comparó los resultados obtenidos con reportes anteriores para determinar que el Modelo Sistémico de Mejora Continua es eficiente en la optimización de procesos comerciales en empresas de telecomunicaciones: en la optimización del Proceso de Venta Masiva, en la optimización del Proceso de Venta Corporativa, en la optimización del Proceso de Cobranza y en la optimización del Proceso de Atención al Cliente.
A Matemática para o Professor dos Primeiros Anos Escolares – a Álgebra Entre a Cultura Enciclopédica e a Formação Profissional
Authors: Valente Wagner Rodrigues
Published: March 2018

Este texto analisa a entrada da Álgebra nos saberes matemáticos de formação de normalistas, a partir das últimas décadas do século XIX. Considera o debate entre dois modelos diferentes, para a formação dos professores dos primeiros anos escolares: o modelo ilustrado, para o ensino de cultura geral e o modelo de formação profissional restrita. A análise realizada toma os referentes da História Cultural. O estudo orienta-se pela questão: que razões justificam a entrada da Álgebra na formação do professor do ensino primário? Os resultados da investigação mostram a presença de rudimentos algébricos que amplificam o domínio da Aritmética tradicional. Em sentido mais amplo, tais conclusões indicam que para o estudo dos modelos de formação é necessário considerarem-se as finalidades de cada um dos saberes particulares, de cada conteúdo matemático.Palavras-chave: Formação de Professores. Educação Matemática. História da Educação Matemática.AbstractThis text analyzes the entrance of Algebra into the mathematical knowledge for the formation of normalists, starting in the last decades of the 19th century. It considers the debate between two different models, for the training of the teachers of primary school: the illustrated model, for the teaching of general culture, and the model of restricted professional formation. The analysis takes the referents of Cultural History. This study is guided by the question: What reasons justify the entry of Algebra into the training of primary school teachers? The results of this investigation show the presence of algebraic rudiments that amplify the domain of traditional Arithmetic. More broadly, these conclusions indicate that for the study of training models it is necessary to consider the purposes of each particular knowledge, of each mathematical content.Keywords: Teacher Training. Mathematics Education. History of Mathematics Education.
Concepções Errôneas de Alunos de Licenciatura em Matemática Sobre o Conceito de Função
Authors: Nunes Célia Barros , Santana Eurivalda Ribeiro dos Santos
Published: March 2018

No âmbito da Educação Matemática, o erro tem sido objeto de relevantes estudos em todos os níveis de escolarização. Este artigo tem como objetivo analisar as concepções errôneas sobre o conceito de função apresentadas por alunos da Licenciatura em Matemática. Para alcançar esse objetivo foram analisadas as resoluções dadas por 40 alunos de um curso de Licenciatura em Matemática, a um instrumento composto de nove tarefas. A análise das resoluções dadas tomou como referência as categorias de concepções errôneas elencadas na perspectiva epistemológica. Diante da análise realizada neste estudo é possível inferir que as concepções errôneas resultam de múltiplos fatores, sobretudo com os que estão relacionadas a conceitos, procedimentos ou princípios matemáticos.Palavras-chave: Erros. Resolução de Problemas. Concepções Errôneas.AbstractIn the Mathematics Education field, the error has been the object of relevant studies in all of the education levels. This article aim to analyze how misconceptions about the concept of function presented by students of the Degree in Mathematics. In order to achieve this aim, we analyzed the resolutions given by 40 students of a Licenciatura Degree in Mathematics, to an instrument composed of nine tasks. An analysis of the given resolutions took as reference as categories of misconceptions listed in the epistemological perspective. In view of the analysis carried out in this study it is possible to infer that the misconceptions result from multiple factors, especially those related to mathematical’ concepts, procedures or principles.Keywords: Error. Problem Solving. Misconceptions.
Child Education in the Pedagogy Course: Lessons from the Internship
Authors: Barbosa Ivone Garcia , Alves Nancy Nonato de Lima , Silveira Telma Aparecida Teles Martins
Published: March 2018

Abstract: this article presents research results comparing Federal Public Institution of Higher Education. The place of Early Childhood Education and the role of the internship in the Pedagogy course. Based on the socio-historical-dialectic perspective, we analyzed the Political-Pedagogical Project of the Course and the Supervised Internship Project in Early Childhood Education and Early Years of Primary Education, considering the possibilities of the internship in the constitution of dialogues between the formative ideology and the realization of the educational praxis in its specificities. The results show that Pedagogy courses still subordinate the pedagogical proposals and practices of Early Childhood Education to Primary School models.

A Educação Infantil no curso de Pedagogia: lições do estágio

Resumo: este artigo apresenta resultados de pesquisas cotejando Instituição de Ensino Superior pública federal. Problematiza-se o lugar da Educação Infantil e o papel do estágio no curso de Pedagogia. Com base na perspectiva sócio-histórico-dialética, analisamos o Projeto Político-Pedagógico do Curso e o Projeto de Estágio Supervisionado na Educação Infantil e Anos Iniciais do Ensino Fundamental, considerando as possibilidades do estágio na constituição de diálogos entre o ideário formativo e a realização da práxis educativa em suas especificidades. Os resultados evidenciam que os cursos de Pedagogia ainda subordinam as propostas e práticas pedagógicas da Educação Infantil a modelos do Ensino Fundamental.
COMUNICAÇÃO COM DEFICIENTES AUDITIVOS NA ÓTICA DE PROFISSIONAIS DE SAÚDE
Authors: Francisqueti Marquete Verônica , Ramos Costa Maria Antônia , Ferraz Teston Elen
Published: March 2018

Objetivo: descrever o conhecimento e a capacitação dos profissionais de saúde quanto à comunicação com os deficientes auditivos. Método: investigação quantitativa, de caráter descritivo, realizada no ano de 2017, com 198 profissionais que compõem a equipe de enfermagem de um município da região Noroeste do estado do Paraná, Brasil. Os dados foram processados em um programa estatístico e descritos por estatística descritiva. Resultados: verificou-se que 92,4% dos profissionais acreditavam estar despreparados para atender o deficiente auditivo, 83,8% não sabiam comunicar-se com esses e 96,5% não sabiam se comunicar em Libras. Muitos utilizavam estratégias visando quebrar a barreira de comunicação, tais como: gestos e escritas (18,7%), fala e gestos (11,6%), entre outros. Conclusão: na percepção dos profissionais de saúde, a barreira de comunicação com os deficientes auditivos ocorria por não saberem comunicar-se em Libras; por isso, utilizavam mecanismos como gestos e mímicas para tentar a comunicação.

Descritores: Comunicação. Perda auditiva. Pessoal de saúde.
Sustitución de cultivos ilícitos y cultura de la legalidad en Colombia = Illicit crop substitution and culture of legality in Colombia
Authors: Rodríguez Pinzón Erika M.
Published: March 2018

Resumen: Este artículo analiza el problema de los cultivos ilícitos y concretamente de los programas de desarrollo alternativo destinados a solucionarla y su relación con la creación de la cultura de la legalidad.En primer lugar analiza el desarrollo alternativo y recorre los diferentes programas que se han desarrollado en Colombia con el fin de conseguir la sustitución de cultivos ilícitos. Después se recogen algunos de los aspectos más relevantes de la relación entre cultivos ilícitos y fallas en la cultura de la legalidad.La última parte del artículo recoge la evidencia empírica de diversos estudios y evaluaciones sobre el impacto de los diferentes programas en el fortalecimiento de la confianza, la participación y la cultura de la legalidad.Palabras clave: Sustitución de cultivos, desarrollo alternativo, narcotráfico, Colombia, Cultura de la legalidad, Estado de DerechoAbstract: This article analyzes the problematic of illicit crops in Colombia and, more specifically, the alternative development programs created to address it and how they are changing the culture of ilegality intrinsic to ilicit crops.It analyzes the relation between a certain culture of illegality and the prevalence of narcotrafic; then it studies the presence of illicit crops in Colombia and describes the evolution of alternative development programs.Finally, it collects and analyzes evidence from different empirical studies about the impact of alternative development programs in the enhancement of social confidence, strengthening of democracy and promotion of legality.  Keywords: Illicit crop substitution, alternative development, narcotraffic, Colombia, Culture of legality, Rule of Law
Bien común = Common good
Authors: Murphy Timothy
Published: March 2018

Resumen: Existen varias concepciones o versiones del concepto de bien común. Este artículo trata de presentar un breve repaso de algunas de las más importantes. Se ofrecen ejemplos del bien común en la “nueva” teoría del derecho natural; en los pensamientos liberal y utilitario; y en los pensamientos comunitario, republicano y hegeliano. Así mismo, se añaden algunos comentarios a modo de conclusión.Palabras clave: Bien común, Aristóteles, Santo Tomás de Aquino, “nueva” teoría del derecho natural, utilitarismo, liberalismo, comunitarismo, republicanismo, hegelianismo.Abstract: There are several conceptions or versions of the concept of the common good. This article aims to provide a brief overview of some of the most prominent conceptions. Accounts are offered of the common good in new natural law theory; in liberal and utilitarian thought; and in communitarian, republican, and Hegelian thought. Some commentary is provided in a brief conclusion.Keywords: The common good, Aristotle, St. Thomas Aquinas, new natural law theory, utilitarianism, liberalism, communitarianism, republicanism, Hegelianism.
Colonialidad (jurídica) = (Legal) coloniality
Authors: Garzón López Pedro
Published: March 2018

Resumen: La voz analiza de manera general la relación entre colonialidad y derecho, teniendo en cuenta el contexto latinoamericano y, en especial, el derecho de los pueblos indígenas. El Derecho ha sido un instrumento de la colonización desde la expansión colonial europea hasta la configuración del Estado “moderno”. De ahí se deduce el estudio del derecho en clave colonial, partiendo de las aportaciones teóricas del “pensamiento decolonial latinoamericano”. La estrategia consiste en situar el análisis del derecho en el contexto de la “colonialidad del saber”, una perspectiva epistemológica crítica al eurocentrismo. Para este propósito nos apoyamos en el derecho indígena para cuestionar los límites del derecho moderno a la luz de la “colonialidad jurídica”. Finalmente, la colonialidad jurídica es planteada como otra manera de ver el derecho sin el lente de la modernidad jurídica.Palabras clave: Colonialismo, colonialidad jurídica, derecho, colonialidad del saber, epistemología, derecho indígena. Abstract: The article analyzes, from a general perspective, the relationship between coloniality and law, taking into account the Latin American context and, especially, the indigenous people’s law. Law has been an instrument of colonization from the European colonial expansion to the "modern" state configuration. Therefore, we approach the study of Law in a colonial sense, starting from the theoretical contributions of the "Latin American decolonial thinking". The strategy consists in placing the analysis of law in the context of the "coloniality of knowledge", a critical epistemological perspective on eurocentrism. To achieve this purpose, we use the indigenous law to question the limits of modern law in light of the "legal coloniality". Finally, the “legal coloniality” is considered as another epistemological perspective to understand the indigenous law without the “modern law” focus.Keywords: Colonialism, legal coloniality, law, coloniality of knowledge, epistemology, indigenous law.
The Financing of Italian Shipping Firms
Authors: Laura Del Gaudio Belinda
Published: March 2018

Bank financing has traditionally been the most prominent source of external finance in shipping industry. The maritime transport sector has undergone numerous changes due to both the economic growth of the emerging countries and the legislative response following the financial crisis (Basel 3). In particular, the tightening on capital adequacy has produced a banking disengagement in terms of loans to the sector that has led to changes in the financing of shipping business. The present paper examines the composition and the dynamics of the mix of alternative forms of financing of Italian shipping firms. The analysis focuses on a sample of 500 Italian companies active in the maritime transport sector between 2007 and 2015. The analysis is aimed at analyse the response in the maritime sector to the trend of banks “disengagement” and compares it with the international trend. The results show that the response to bank disengagement should be better articulated since all alternative forms of financing are not widely used, in particular the stock and bond market suffer of very low volume and intensity. The benefits deriving from the diversification of the mix of alternative forms of financing should be object of further studies especially in the field of risk management.
İNFORMAL ÖĞRENME ORTAMLARININ ORTAOKUL ÖĞRENCİLERİNİN MATEMATİK TUTUMUNA ETKİSİ - THE EFFECT OF THE MATHEMATICAL LEARNING AREAS TO THE ATTITUDES TOWARDS MATHEMATICS
Authors: Çağlar Sezgin , Ünal Yusuf , Çalışkan Büşra , Gürel Ramazan , Durmaz Burcu
Published: March 2018

Bu araştırmanın amacı matematik dersine yönelik informal
öğrenme ortamlarının ortaokul öğrencilerinin matematik dersine yönelik
tutumlarına olan etkisini incelemektir. Bu amaçla Akdeniz bölgesinde yer alan
bir ilin merkezindeki ortaokullardan sosyoekonomik açıdan birbirine denk iki
ortaokul seçilmiştir. Bu okullar seçilirken ilgili okullarda bu tür matematik
öğrenme alanlarının olmaması ve öğrencilerin matematikle ilgili oyun, etkinlik
vb. görsel materyalle karşılaşma ihtimallerinin düşük olduğu görece daha düşük
sosyoekonomik düzeye sahip okulların seçimine dikkat edilmiştir. Dolayısıyla
araştırmanın yürütüldüğü okullar ve araştırmaya dahil edilen öğrencilerin
belirlenmesinde amaçlı örnekleme yoluna gidilmiştir. Araştırma ön test son test
deney kontrol gruplu yarı deneysel modelindedir. Deneysel süreçte deney
grubundaki öğrencilerin okullarındaki ortak kullanım alanlarına matematikle
ilgili formül, kural, karikatür, modelleme ve oyun vb. çalışmalar yapıldıktan
sonra 2016-2017 eğitim öğretim yılının ikinci döneminde yaklaşık iki ay süreyle
seçmeli matematik dersleri ve teneffüslerde matematikle alakalı oyunlar
tanıtılıp oynanmıştır. Kontrol grubundaki öğrenciler için ise herhangi bir
müdahalede bulunulmamıştır. Her iki okulda da 5. sınıftan 8. sınıfa kadar tüm
sınıf düzeyindeki 369 öğrenciye  uygulama
öncesinde ve sonrasında Önal (2013) tarafından geliştirilen 5’li likert
tipindeki 22 maddelik “Ortaokul Öğrencilerine Yönelik Matematik Tutum Ölçeği
(OÖYMTÖ)” uygulanmıştır. Araştırmadan elde edilen verilerin güvenirliği için
hesaplanan Cronbach Alpha katsayıları her iki ölçüm için de kabuledilebilir
düzeydedir. Deney ve kontrol gruplarının matematiğe yönelik tutum puanları
üzerinde oluşturulan informal öğrenme ortamının etkisini test etmek üzere
ilişkili ve ilişkisiz gruplar t testleri kullanılmıştır. Araştırma sonucunda
matematiğe yönelik tutum ölçeğinin kaygı ve gereklilik alt boyutlarında deney
grubu lehine istatistiksel olarak anlamlı bir farkın olduğu görülmüş ve
bulgulara dayalı olarak bazı önerilerde bulunulmuştur.
SANTANA DO MATOS, RIO GRANDE DO NORTE: Uma Pintura Rupestre Recuperada das Águas
Authors: Martin Gabriela , Santos Júnior Valdeci Dos
Published: March 2018

A partir de um desenho originalmente efetuado em 1927 pelo agricultor José de Azevedo Dantas, foi possível reconstituir graficamente, em 2017, um painel de pinturas rupestres no sítio arqueológico Pinturas, localizado no município de Santana do Matos, Estado do Rio Grande do Norte, Brasil, que tinha sido quase que totalmente destruído pela ação das águas, oriundas de um açude construído em 1951 nas proximidades do suporte rochoso contendo as pinturas. A reconstituição auxiliou na preservação da memória gráfica e evidenciou a presença de características picturais da Tradição Agreste e também da Tradição Nordeste, Subtradição Seridó. SANTANA DO MATOS, RIO GRANDE DO NORTE: A rock painting recovered from the waters ABSTRACTFrom a drawing originally made in 1927 by the farmer José de Azevedo Dantas, it was possible to reconstitute graphically, in 2017, a panel of cave paintings in the archaeological site Pinturas, located in the municipality of Santana do Matos, State of Rio Grande do Norte, Brazil, that had been almost totally destroyed by the action of the waters, coming from a dam built in 1951 near the rocky support containing the paintings. The reconstitution assisted in the preservation of the graphic memory and evidenced the presence of pictorial characteristics of the Agreste Tradition and also of the Nordeste Tradition, Seridó Subtradition.Keywords: Preservation of memory - Graphical reconstitution - Nordeste Tradition, Seridó Subtradition.
Mid Mesial Canal in Mandibular Molars: Two Case Report and A Review of Literature
Authors: Yadav Anushka , Saraswat Somendra , Adyanthaya B.R. , Mathur Meetu
Published: March 2018

The main objective of root canal treatment is thorough mechanical and chemical cleansing of the entire pulp space followed by complete obturation with an inert filling material. These molars normally have two roots, one mesial and one distal, and their usual canal distribution is two in the mesial root and one or two in the distal root. This clinical case reports and review of literature describes the management of the mandibular molar with three separate mesial canals including middle mesial canal.
Computing Academics into New Age Programs and Fields: Big Data Analytics & Data Sciences in Indian Academics—An Academic Investigation of Private Universities
Authors: Paul P. K. , Aithal P. S.
Published: March 2018

India is moving towards a developed country and thus knowledge cultivation is very much required and in this context introducing new age programs and degrees are essential. This is required for the creation of next generation skills and knowledge as per industrial and organizational demands including Government etc. Data Science is about managing the large amount and complex data, moreover, it is also known as Big Data Technologies. Due to the wider requirement in different universities and organizations, many international universities have started academic programs on Data Sciences and Big Data. However, a large number of institutes are located in India but only a few offer programs on Data Science and Allied Technologies. Importantly most these are listed in Engineering Colleges and few Private Universities. Universities in this regard adopted both full-fledged degrees and specialization methods to offer the Data Sciences and Allied Technologies. This paper is theoretical and contextual in nature, but also purely interdisciplinary in nature combines with education, information technology, and managerial science to learn about the status and future of qualified and skilled manpower. However, the paper is specially focused on private universities only with a brief overview of the technologies in international universities. 
Biomarkers Determining Prognosis of Atrial Fibrillation Ablation
Authors: Tsiachris Dimitris , Giannopoulos George , Deftereos Spyridon , Kossyvakis Charis , Tsioufis Constantinos , Siasos Gerasimos , Oikonomou Evangelos , Gatzoulis Konstantinos , Tousoulis Dimitris , Stefanadis Christodoulos
Published: March 2018

Catheter ablation for rhythm control is recommended in specific patient populations
with paroxysmal, persistent, or long-standing persistent atrial fibrillation. Pulmonary
vein isolation is the cornerstone of the ablative therapy for atrial fibrillation. However, relapse
is still common since the single procedure efficacy of atrial fibrillation ablation was estimated
to be 60-80% in paroxysmal and 50-70% in persistent atrial fibrillation. It is important to
identify predictors of successful atrial fibrillation patients ablation. In the present review, we
will assess the role of available biomarkers to predict responders of an initial atrial fibrillation
catheter ablation. Emphasis has been given on the role of myocardial injury biomarkers, natriuretic
peptides and traditional inflammatory markers. Novel inflammatory markers, oxidative
stress biomarkers and microRNAs have also been examined as predictors of a successful atrial
fibrillation procedure. Notably, the impact of procedural and short-term administration of
steroids, as well as the role of colchicine on preventing atrial fibrillation recurrence after ablation
is thoroughly presented.
Positron Emission Tomography and Autoradiography Imaging of P-selectin Activation Using 68Ga-Fucoidan in Photothrombotic Stroke
Authors: Israel Ina , Fluri Felix , Örbom Anders , Schadt Fabian , Buck Andreas K. , Samnick Samuel
Published: March 2018

Background:

P-selectin is activated early after stroke, followed by a rapid decline. This
time course can be used to generate important information on stroke onset. The latter is crucial for
therapeutic decision-making of wake-up strokes (i.e. thrombolysis or not). Here, we evaluated the
specific p-selectin inhibitor fucoidan labeled with gallium-68 (68Ga-Fucoidan) as an imaging biomarker
for assessing p-selectin activation in acute ischemic stroke using Positron Emission Tomography
(PET).

Methods:

68Ga-Fucoidan was investigated in rats brain at 2-5 h (n=16), and additionally at 24-26 h
(n=9) and 48 h (n=3) after induction of photothrombic stroke or in sham-operated animals (n=6).
Correlation of cerebral 68Ga-Fucoidan uptake with p-selectin expression was determined by exposing
freshly cut brain cryosections to autoradiography and immunostaining using specific antibodies
against p-selectin.

Results:

PET scans showed an increased accumulation of 68Ga-Fucoidan in the histologically
proven ischemic stroke, as compared to the corresponding contralateral hemisphere in all except
one animal. The median ratio between the uptake in the ischemic lesion and the contralateral region
was 1.95 (1.45-2.41) at 2-5 h, 1.38 (1.05-1.89) at 24-26 h, and 1.09 (0.81-1.38) at 48 h after
stroke, compared to 1.22 (0.99-1.49) for sham-operated animals. In the ex vivo autoradiography,
68Ga-Fucoidan accumulation co-localized with p-selectin as assessed by immunostaining. Control
animals and those scanned at 24-26 h and 48 h after stroke exhibited no elevated 68Ga-Fucoidan
uptake in either hemisphere.

Conclusion:

PET imaging using 68Ga-Fucoidan represents a valuable tool for assessing p-selectin
activation in vivo discriminating ischemic stroke early after stroke onset.
Application of Silicon Quantum Dots in the Detection of Formaldehyde in Water and Organic Phases
Authors: Zhang Zhixia , Zhao Dan , Pang Yonghao , Hao Jian , Xiao Xincai , Hu Yan
Published: March 2018

Background:

Formaldehyde is widely acknowledged as a carcinogen, but as an important organic reagent, it has also been widely employed in the fields of chemical synthesis, industrial production and biomedicine. It is therefore of great practical significance for the detection of formaldehyde in food, clothing, daily necessities, construction materials and environments.

Methods:

The two silicon QDs, that are, DAMO-Si-QDs (with N-[3-(Trimethoxysilyl) propyl] ethylenediamine as silicon source) and APTMS-Si-QDs (with (3-Aminopropyl) trimethoxysilane as silicon source) as the fluorescence probe to detect formaldehyde in both water and organic phases.

Results:

Silicon QDs prepared by different silicon sources exhibit an obvious difference in their tolerances to the environment and the responses to formaldehyde. However, APTMS-Si-QDs show better selectivity in both water and organic phases. In Tris-HCl solution (20.00mmol•L-1, pH=5), the formaldehyde concentration maintains an excellent linear relationship with the fluorescence intensity of APTMS-Si-QDs in the range of 3.125×10-7-3.125×10-5 mol•L-1, with correlation coefficient R2= 0.9998. In methanol, the formaldehyde concentration maintains an excellent linear relationship with the fluorescence intensity of APTMS-Si-QDs in the range of 1.563×10-7-3.125×10-5 mol•L-1, with correlation coefficient R2= 0.9992.

Conclusion:

It is found that DAMO-Si-QDs show poor response to the presence of formaldehyde, while APTMS-Si-QDs got a strong, sensitive and selective response to that in both aqueous and organic phases. In the Tris-HCl buffer (20 mmol•L-1, pH=5), the linear range for formaldehyde detection reaches 3.125×10-7-3.125×10-5 mol•L-1, and for the detection in the organic phase, the linear range reaches 1.563×10-7-3.125×10-5 mol•L-1, in methanol solution. The paper provides a sensitive, selective and simple means for formaldehyde detection in both aqueous and organic phase
High Temperature Quantum Kinetic Effects in Silicon Nanosandwiches
Authors: Bagraev N.T. , Klyachkin L.E. , Khromov V.S. , Malyarenko A.M. , Mashkov V.A. , Matveev T.V. , Romanov V.V. , Rul N.I. , Taranets K.B.
Published: March 2018

AbstractThe negative- U impurity stripes confining the edge channels of semiconductor quantum wells are shown to allow the effective cooling inside in the process of the spin-dependent transport, with the reduction of the electron-electron interaction. The aforesaid promotes also the creation of composite bosons and fermions by the capture of single magnetic flux quanta on the edge channels under the conditions of low sheet density of carriers, thus opening new opportunities for the registration of the high temperature de Haas-van Alphen, 300 K, quantum Hall, 77 K, effects as well as quantum conductance staircase in the silicon sandwich structure.
Photocharging dynamics in colloidal CdS quantum dots visualized by electron spin coherence
Authors: Yakovlev D.R. , Feng D.H. , Pavlov V.V. , Rodina A.V. , Shornikova E.V. , Mund J. , Bayer M.
Published: March 2018

AbstractWe use a time-resolved technique with three laser pulses (pump, orientation and probe) to study the photocharging dynamics with picosecond resolution on a long timescale ranging from ps to ms in CdS colloidal quantum dots. The detection is based on measuring the coherent spin dynamics of electrons, allowing us to distinguish the type of carrier in the dot core (electron or hole). We find that although initially negative photocharging happens because of fast hole trapping on surface states, eventually it evolves to positive photocharging due to electron trapping and hole detrapping. The positive photocharging lasts up to hundreds of microseconds at room temperature.
Квантово-размерная зависимость энергии образования вакансии в заряженных малых металлических кластерах. Капельная модель
Authors: Погосов В.В. , Рева В.И.
Published: March 2018

AbstractSelf-consistent computations of the monovacancy formation energy are performed for Na_ N , Mg_ N , and Al_ N (12 < N ≤ 168) spherical clusters in the drop model for stable jelly. Scenarios of the Schottky vacancy formation and “bubble vacancy blowing” are considered. It is shown that the asymptotic behavior of the size dependences of the energy for the vacancy formation by these two mechanisms is different and the difference between the characteristics of a charged and neutral cluster is entirely determined by the difference between the ionization potentials of clusters and the energies of electron attachment to them.
Вращение в постоянном электрическом поле сферической частицы при непрерывном освещении, индуцирующем электрический дипольный момент
Authors: Грачев А.И.
Published: March 2018

AbstractRotation of a spherical particle in a static electric field and under steady irradiation that induces an electric dipole moment in the particle is studied for the first time. Along with the general treatment of the phenomenon, we analyze possible mechanisms underlying the photoinduction of dipole moment in the particle. Estimations of the angular velocity and the power expended by the rotating particle are provided. The indicated characteristics reach their maximum values if the size of particles is within the range of 10 nm to 10 μm.
Рамановское рассеяние кристаллами гексаборидов редких земель с различными изотопами бора
Authors: Марков Ю.Ф. , Гурин В.Н. , Понкратов К.В.
Published: March 2018

AbstractMonocrystals of lanthanum hexaboride LaB_6 containing both natural boron and its isotopes ^10B and ^11B have been produced using the solution-melt method. Polyelement hexaboride rare-earths have been grown and the corresponding ceramics have been synthesized for the first time. All these crystals have been studied by means of various techniques, generally using Raman scattering. The Raman spectra attributed to various spectral lines corresponding to nonanalyzable representations have been obtained and interpreted. Frequencies and half-widths of spectral lines have been obtained, the removal of degeneracy and the development of respective splitting of degenerate oscillations induced by defects, mainly by boron isotope inclusions, have been identified. The influence of defects on the Raman spectra has been determined.
Исследование мезоструктуры моногерманидов переходных металлов, синтезированных под давлением
Authors: Сафиулина И.А. , Алтынбаев Е.В. , Яшина Е.Г. , Heinemann A. , Фомичева Л.Н. , Цвященко А.В. , Григорьев С.В.
Published: March 2018

AbstractThe mesostructure of transition-metal monogermanides Mn_1 – x Co_ x Ge is studied by small-angle neutron scattering in a wide range of concentrations x = 0–0.95. These compounds were synthesized under high pressure and are metastable under normal conditions. The experimental dependences I ( Q ) obtained for the whole series of samples in the range of transferred momenta (6 × 10^–2 nm^–1 < Q < 2.5 nm^–1) are described by the power dependence Q ^– n with an exponent n = 2.99 ± 0.02, uniquely related to the fractal properties of the system under study. The dependence obtained indicates that the superatomic structure of the samples is characterized by the presence of defects with a spatial organization described by a fractal model with a logarithmic dependence of the correlation function of the defect density. It is interesting to note that such defects are absent in the isostructural FeGe compound, i.e., the experimental dependences of the intensity are described well by the expression Q ^– n with an exponent n = 4.1 ± 0.1, which demonstrates the presence of crystallites with a uniform density distribution inside and a sharp boundary characterizing the surface.
Особенности перколяционной схемы перестройки колебательного спектра сплава с составом для Ga-=SUB=-1-x-=/SUB=-Al-=SUB=-x-=/SUB=-P
Authors: Козырев С.П.
Published: March 2018

AbstractSpecific features of the properties of Ga–P lattice vibrations have been investigated using the percolation model of a mixed Ga_1 – x Al_ x P crystal (alloy) with zero lattice mismatch between binary components of the alloy. In contrast to other two-mode alloy systems, in Ga_1 – x Al_ x P a percolation splitting of δ ~ 13 cm^–1 is observed for the low-frequency mode of GaP-like vibrations. An additional GaP mode (one of the percolation doublet components) split from the fundamental mode is observed for the GaP-rich alloy, which coincides in frequency with the gap corresponding to the zero density of one-phonon states of the GaP crystal. The vibrational spectrum of impurity Al in the GaP crystal has been calculated using the theory of crystal lattice dynamics. Upon substitution of lighter Al for the Ga atom, the calculated spectrum includes, along with the local mode, a singularity near the gap with the zero density of phonon states of the GaP crystal, which coincides with the mode observed experimentally at a frequency of 378 cm^–1 in the Ga_1 – x Al_ x P ( x < 0.4) alloy.
Двумерная модель рулонных упаковок молекулярных нанолент
Authors: Савин А.В. , Мазо М.А.
Published: March 2018

AbstractA simplified model of the in-plane molecular chain, allowing the description of folded and scrolled packings of molecular nanoribbons of different structures, is proposed. Using this model, possible steady states of single-layer nanoribbons scrolls of graphene, graphane, fluorographene, and fluorographane (graphene hydrogenated on the one side and fluorinated on the other side) are obtained. Their stability is demonstrated and their energy is calculated as a function of the nanoribbon length. It is shown that the scrolled packing is the most energetically favorable nanoribbon conformation at long lengths. The existences of scrolled packings for fluorographene nanoribbons and the existence of two different scroll types corresponding to left- and right-hand Archimedean spirals for fluorographane nanoribbons in the chain model are shown for the first time. The simplicity of the proposed model makes it possible to consider the dynamics of scrolls of rather long molecular nanoribbons at long enough time intervals.
Локальная симметрия канала для транспорта атомов, молекул и его внутренние размеры
Authors: Крылова Н.А. , Клявин О.В. , Калашников Е.В.
Published: March 2018

AbstractThe effect of a channel’s symmetry type on its internal dimensions, which would allow the movement of atoms (ions, molecules), has been discussed. Based on the symmetry properties of the Lagrange function for the channel and the properties of the channel itself, its internal dimensions are determined. The particular example of the crystallographic channel of quartz and its dislocations is considered.
Влияние свойств жидкости на режимы двухфазного течения в широком прямоугольном микроканале
Authors: Роньшин Ф.В. , Чеверда В.В. , Чиннов Е.А. , Кабов О.А.
Published: March 2018

AbstractWe have experimentally studied a two-phase flow in a microchannel with a height of 150 μm and a width of 20 mm. Different liquids have been used, namely, a purified Milli-Q water, an 50% aqueous-ethanol solution, and FC-72. Before and after the experiment, the height of the microchannel was controlled, as well as the wettability of its walls and surface tension of liquids. Using the schlieren method, the main characteristics of two-phase flow in wide ranges of gas- and liquid-flow rates have been revealed. The flow regime-formation mechanism has been found to depend on the properties of the liquid used. The flow regime has been registered when the droplets moving along the microchannel are vertical liquid bridges. It has been shown that, when using FC-72 liquid, a film of liquid is formed on the upper channel wall in the whole range of gas- and liquid-flow rates.
Аналитический подход к определению влияния теплового шума на среднюю частоту и амплитуду спинового генератора
Authors: Половинкин А.В. , Мишагин К.Г.
Published: March 2018

AbstractAn axisymmetric model of a spin-transfer nano-oscillator (STNO) under the action of statistically isotropic magnetic-field fluctuations is considered. An expression for the stationary probability-density distribution of the angular coordinates of magnetization vector is analytically derived and used for determining dependences of the mean value and standard deviation of the amplitude and the mean oscillation frequency on the magnitude of current. The phenomenon of noise-induced shifts of the mean values of STNO amplitude and frequency is discovered. The latter effect qualitatively explains the experimentally observed dependences of the generation frequency on the STNO current.
Усиление люминесценции квантовых точек вблизи слоя наночастиц Ag/SiO-=SUB=-2-=/SUB=-
Authors: Матюшкин Л.Б. , Перцова А. , Мошников В.А.
Published: March 2018

AbstractWe have studied the influence of monodisperse Ag/SiO_2 core–shell-type nanoparticles with a core diameter of 17 nm and a dielectric-shell thickness within 0–40 nm on the photoluminescence of CdSe/ZnS quantum dots (QDs) excited by laser at a wavelength corresponding to the plasmon resonance in Ag/SiO_2 nanoparticles. It is established that the intensity of QD luminescence in the composite system exhibits up to 8.7-fold increase.
Условия возбуждения вращения сердечника в вихревом устройстве
Authors: Самохвалов В.Н.
Published: March 2018

AbstractIt is established that aerodynamic drag alone is insufficient to induce forced rotation of a bearing-supported axial core in a mechanical vortex device at an input-flow pressure of up to 0.7 MPa. A necessary condition for the onset of core rotation is the excitation of bending and axial precession of the cantilever-supported core. In the absence of a mechanical contact between the core and expansion chamber of the vortex device, the direction of core rotation is the same as that of the airflow vortex. Forced rotation in the counter direction starts under conditions of dynamic bending that leads to the mechanical contact and rolling of the core over the surface of the expansion chamber.
Self-Care Behaviors of Ovarian Cancer Patients Before Their Diagnosis: Proof-of-Concept Study (Preprint)
Authors: Flanagan James M , Skrobanski Hanna , Shi Xin , Hirst Yasemin
Published: March 2018

BACKGROUND

Longer patient intervals can lead to more late-stage cancer diagnoses and higher mortality rates. Individuals may delay presenting to primary care with red flag symptoms and instead turn to the internet to seek information, purchase over-the-counter medication, and change their diet or exercise habits. With advancements in machine learning, there is the potential to explore this complex relationship between a patient’s symptom appraisal and their first consultation at primary care through linkage of existing datasets (eg, health, commercial, and online).

OBJECTIVE

Here, we aimed to explore feasibility and acceptability of symptom appraisal using commercial- and health-data linkages for cancer symptom surveillance.

METHODS

A proof-of-concept study was developed to assess the general public’s acceptability of commercial- and health-data linkages for cancer symptom surveillance using a qualitative focus group study. We also investigated self-care behaviors of ovarian cancer patients using high-street retailer data, pre- and postdiagnosis.

RESULTS

Using a high-street retailer’s data, 1118 purchases—from April 2013 to July 2017—by 11 ovarian cancer patients and one healthy individual were analyzed. There was a unique presence of purchases for pain and indigestion medication prior to cancer diagnosis, which could signal disease in a larger sample. Qualitative findings suggest that the public are willing to consent to commercial- and health-data linkages as long as their data are safeguarded and users of this data are transparent about their purposes.

CONCLUSIONS

Cancer symptom surveillance using commercial data is feasible and was found to be acceptable. To test efficacy of cancer surveillance using commercial data, larger studies are needed with links to individual electronic health records.
A COMPARATIVE STUDY BETWEEN THE USE OF BLOCK STYLE AND POINT BY POINT METHOD ON WRITING ABILITY
Authors: Ihsan Muhammad Taufik
Published: March 2018

The  main aim of this research was to find out whether there is any significant difference between students’ writing ability on using block style method and students’ writing ability on using point by point method. The design of this research is a causal-comparative study that focusing on quantitative research. The subject of this research was level 2 students’ of language center UIN Suska Riau. The object of this research was comparing between using block style and point by point method on students’ writing ability. The sample was two classes; Experiment class (34 students) and compare class (34 students). The total sample was 78 students by using cluster sampling. The test and questionnaire  were used to collect the data and data was anlyzed by using compare means and t-test by using SPSS 20.0. the last finding of this research was found that there was a signifficant difference on students’ writing ability between using block style and point by point method. It shown on comparing the mean score. Block style method was 60.7353 and point by point method was 78.3824. And the hyphothesis testing was show the result of post T-test 11.823, then score of sig.(2-tailed) is 0.000. if we act to null hypothesis (Ho) that is 0.05, it  means that the score of sig.(2-tailed) was smaller than score of Ho. Therefore, the null hypothesis was rejected and the alternative hypothesis was accepted. It  means that there is a significant difference between The Use of  Block Style Method and Point by Point Method  on The Students’ Writing Ability at Language Center of UIN Suska Riau. At last,  it shows that Point by point was better compared to the implementation of Block Style Method.
A GENRE-BASED TEXTUAL ANALYSIS OF EXPERT ONLINE REVIEWS OF ELECTRIC GUITAR FUZZ PEDALS
Authors: Moya Che
Published: March 2018

This study uses genre analysis to analyze contemporary online text.  Through an analysis of the linguistic features of text from a highly specialized discourse community, perceived expert online reviews of electric guitar fuzz pedals, findings from this study provide insight into the relevance of online reviews. Although there is a layman quality to the actual production of the textual online reviews, genre analysis reveals hybridized genres, authorial power within occluded genre chains, subconscious marketing techniques, and manipulation of perceived expert online reviews. Findings from this study indicate that online reviews have complex occluded genre chains, which are not readily obvious when the reviews are read only for entertainment purposes.  This research has real world applications as relationships between textual generic qualities of online reviews and consumer spending habits are now easily acquired from online data-mining techniques to assist in targeting online consumers’ habits and to increase sales. Online reviews are now what consumers use to assist in shopping. Control of reviews translates to control of consumers’ shopping habits.
THE INFLUENCE OF TECHNOLOGY ON ARTICLES IN TRAVEL WEBSITES
Authors: Istiani Imas
Published: March 2018

As one of the oldest genres, travel writing genre has evolved in many shapes and formats. Technology plays a great role in creating another subgenre with some differences from the printed formats. The generic features of travel writing on the internet are relatively simple in using words, only putting the key information of the described places and events, and most of the judgments are subjective evaluation. Yet, online articles provide more room for pictures that give benefits to the authors (to express their judgments), the readers (to create the image of the descriptive texts), as well as to the website traffics (for image is another tool to inquire and attract internet users). The technology also heavily influences the usage of further links and the second person pronoun “you.”
MISKONSEPSI MAHASISWA MENGENAI IKATAN ION DALAM SENYAWA NaCl
Authors: Yasthophi Arif - , Ritonga Pangoloan Soleman
Published: March 2018

Research on new university student misconceptions about bond in NaCl compounds has been done to identify possible misconceptions. Student misconceptions are observed using a misconception analysis instrument consisting of statements accompanied by right and wrong choices and open reasons. Based on the analysis of the instrument that has been done found that the students experience the concept of ionic bonding in the compound NaCl. Students experience misconceptions why NaCl is an ionic compound. In addition, misconceptions are also found about the physical properties of the associated NaCl compounds, ie students believe that NaCl is a compound with a brittle bond and no breaking of bonds in NaCl solution and NaCl has electrolyte properties in solid phase.
ANALISIS KESULITAN PENGUASAAN KONSEP TEORITIS DAN PRAKTIKUM KIMIA MAHASISWA CALON GURU KIMIA
Authors: Kurniawati Yenni
Published: March 2018

Abstract The difficulties of preservice chemistry teacher in understanding theoretical and experimental chemistry were needed to be explored. This research was conducted to analyze students' difficulties in understanding theoretical and experimental chemistry courses, to obtained information that can be used as an evaluation for lecturers and faculty in an effort to improve the quality of preservice chemistry teacher. Mixed method with embedded design was used in this research by given priority to qualitative data as core and quantitative data to supported the analysis. This research found that teoretical inorganic and physical chemistry objects were the most difficult course for fifth semester students, whereas for the seventh graders physical and instrumental chemistry was the most difficult. The main causes of difficulty for students was the chemical abstractions plus the mathematic analysis that was not easily to deep understood by the students. Studets learning patterns and learning design are things that need to be improve to get better results. Kata Kunci: Kesulitan Mahasiswa, Kimia Teoritis, Praktikum Kimia
PENDIDIKAN SEKS PADA ANAK
Authors: Nurlaili Nurlaili
Published: March 2018

Basicly, the teaching of sex education for the child is the same as giving immunisation to him/her. The child who has got the sex education expected will has a high self control and impenetrability to the virus attack of sex unrighteous, for example pornography, deviation, or sex abused, so that the child is not easy to infects by irresponsible sex. The Sex education for the child conducted step by step as according to his/her age. Instruction of sex is conducted squarely, easy going, and does not with negative enragement to the problem of sex. Parents have to develop sportive communications, so that the child will has a emotional openness toward parents, growing up the child trust toward parents, The problems of sex are not only a problem of intimate relationship, but many problems are there, either biological, psychological, and social. In Islam, the sex education is a part of the integration of aqidah, moral, and religious education.