bluuebunny/crossref_metadata_2025 huggingface dataset:
Carbon Nitride Nanosheet and Myoglobin Modified Electrode for Electrochemical Sensing Investigations
Authors: Deng Ying , Wen Zuorui , Luo Guiling , Xie Hui , Liu Juan , Xi Yaru , Li Guangjiu , Sun Wei
Published: July 2019

Background:

Carbon-based nanomaterials, especially carbon nitride (C3N4) has attracted
tremendous interest in biosensor applications. Meanwhile, the mechanism of redox protein sensing
and related electrocatalytic reactions can provide a valid basis for understanding the process of biological
redox reaction.

Objective:

The aim of this paper is to construct a new electrochemical enzyme sensor to achieve direct
electron transfer of myoglobin (Mb) on CILE surface and display electrocatalytic reduction activity
to catalyze trichloroacetic acid (TCA) and H2O2.

Methods:

The working electrode was fabricated based on ionic liquid modified Carbon Paste Electrode
(CILE) and C3N4 nanosheets were modified on the CILE surface, then Mb solution was fixed
on C3N4/CILE surface and immobilized by using Nafion film. The as-prepared biosensor displayed
satisfactory electrocatalytic ability towards the reduction of TCA and H2O2 in an optimum pH 7.0
buffer solution.

Results:

The results indicated that C3N4 modified electrode retained the activity of the enzyme and
displayed quasi-reversible redox behavior in an optimum pH 7.0 buffer solution. The electrochemical
parameters of the immobilized Mb on the electrode surface were further calculated with the results of
the electron transfer number (n) as 1.27, the charge transfer coefficient (α) as 0.53 and the electrontransfer
rate constant (ks) as 3.32 s-1, respectively. The Nafion/Mb/C3N4/CILE displayed outstanding
electrocatalytic reduction activity to catalyze trichloroacetic acid and H2O2.

Conclusion:

The Nafion/Mb/C3N4/CILE displayed outstanding electrocatalytic reduction, which
demonstrated the promising applications of C3N4 nanosheet in the field electrochemical biosensing.
Optimization of Extraction Parameters of Reverse Iontophoretic Determination of Blood Glucose in an Artificial Skin Model
Authors: Yengin Cigdem , Kilinc Emrah , Der Fatma Gulay , Sezgin Mehmet Can , Alcin Ilayda
Published: July 2019

Background:

Reverse İontophoresis (RI) is one of the promising non-invasive technologies.
It relies on the transition of low magnitude current through the skin and thus glucose measurement
becomes possible as it is extracted from the surface during this porter current flow.

Objective:

This paper deals with the development and optimization of an RI determination method
for glucose. CE dialysis membrane based artificial skin model was developed and the dependence of
RI extraction on various experimental parameters was investigated.

Method:

Dependence of RI extraction performance on noble electrodes (platinum, silver, palladium,
ruthenium, rhodium) was checked with CA, CV and DPV, in a wide pH and ionic strength range.
Optimizations on inter-electrode distance, potential type and magnitude, extraction time, gel type,
membrane MWCO, usage frequency, pretreatment, artificial body fluids were performed.

Results:

According to the optimized results, the inter-electrode distance was 7.0 mm and silver was
the optimum noble metal. Optimum pH and ionic strength were achieved with 0.05M PBS at pH 7.4.
Higher glucose yields were obtained with DPV, while CA and CV achieved almost the same levels.
During CA, +0.5V achieved the highest glucose yield and higher potential even caused a decrease.
Glucose levels could be monitored for 24 hours. CMC gel was the optimum collection media. Pretreated
CE membrane with 12kD MWCO was the artificial skin model. Pretreatment affected the yields
while its condition caused no significant difference. Except PBS solution (simulated as artificial
plasma), among the various artificial simulated body fluids, intestinal juice formulation (AI) and urine
formulation U2 were the optimum extraction media, respectively.

Conclusion:

In this study, various experimental parameters (pretereatment procedure, type and
MWCO values of membranes, inter-electrode distance, electrode material, extraction medium solvents,
ionic strength and pH, collection medium gel type, extraction potential type and magnitude,
extraction time and etc) were optimized for the non-invasive RI determination of glucose in a CE dialysis
membrane-based artificial skin model and various simulated artificial body fluids.
Prevalence and Characteristics of Twitter Posts About Court-Ordered, Tobacco-Related Corrective Statements: Descriptive Content Analysis
Authors: Kelley Dannielle E , Brown Meredith , Murray Alice , Blake Kelly D
Published: July 2019

Background

Three major US tobacco companies were recently ordered to publish corrective statements intended to prevent and restrain further fraud about the health effects of smoking. The court-ordered statements began appearing in newspapers and on television (TV) in late 2017.

Objective

The objective of this study was to examine the social media dissemination of the tobacco corrective statements during the first 6 months of the implementation of the statements.

Methods

We conducted a descriptive content analysis of Twitter posts using an iterative search strategy through Crimson Hexagon and randomly selected 19.74% (456/2309) of original posts occurring between November 1, 2017, and March 27, 2018, for coding and analysis. We assessed post volume over time, source or author, valence, linked content, and reference to the industry (eg, big tobacco, tobacco industry, and Philip Morris) and media outlet (TV or newspaper). Retweeted content was coded for source/author and prevalence.

Results

Most posts were published in November 2017, surrounding the initial release of the corrective statements. Content was generally neutral (58.7%, 268/456) or positive (33.3%, 152/456) in valence, included links to additional information about the statements (94.9%, 433/456), referred to the industry (87.7%, 400/456), and did not mention a specific media channel on which the statements were aired or published (15%). The majority of original posts were created by individual users (55.2%, 252/456), whereas the majority of retweeted posts were posted by public health organizations (51%). Differences by source are reported, for example, organization posts are more likely to include a link to additional information compared with individual users (P=.03).

Conclusions

Conversations about the court-ordered corrective statements are taking place on Twitter and are generally neutral or positive in nature. Public health organizations may be increasing the prevalence of these conversations through social media engagement.
PENGARUH PENERAPAN MODEL PEMBELAJARAN KOOPERATIF TIPE NUMBERED HEADS TOGETHER (NHT) TERHADAP PEMAHAMAN KONSEP IPA FISIKA SISWA KELAS VII SMP MUHAMMADIYAH 6 PADANG
Authors: Wulansari Egi
Published: July 2019

Penelitian ini dilatarbelakangi oleh kurangnya ketelitian dan tanggung jawab siswa dalam mengerjakan tugas serta rendahnya pemahaman konsep IPA Fisika siswa kelas VII SMP Muhammadiyah 6 Padang. Jenis penelitian ini adalah quasi eksperiment, dengan desain penelitian posttest only control group design. Populasi dalam penelitian ini adalah siswa kelas VII SMP Muhammadiyah 6 Padangyang terdiri dari 3 kelas. Teknik pengambilan sampel dilakukan dengan teknik cluster random sampling,   penentuan   kelas   sampel   dilakukan   secara   acak.  Berdasarkan hasil analisis data, diketahui bahwa kelas sampel terdistribusi normal dan memiliki variansi yang homogen. Hasil uji hipotesis diperoleh dengan menggunakan uji   satu pihak diperoleh     t hitung        =  1,94 dan     t tabel      =  1,67. Data yang diperoleh t hitung           > t tabel            =  1,94 >  1,67 maka hipotesis diterima. Jadi dapat disimpulkan bahwa pemahaman konsep IPA Fisika siswa dengan menerapkan pembelajaran kooperatif tipe NHT lebih baik dari pada pemahaman konsep IPA Fisika  siswa  dengan  menerapkan  pembelajaran  konvensional  siswa  kelas  VII SMP Muhammadiyah 6 Padang.Kata Kunci : Model Pembelajaran Kooperatif, Number Heads Together (NHT), Pemahaman Pembelajaran Fisika
PENGARUH PENERAPAN TEKA TEKI SILANG DALAM PEMBELAJARAN DISCOVERY LEARNING TERHADAP HASIL BELAJAR FISIKA SISWA KELAS XI MIPA SMA NEGERI 14 PADANG
Authors: Rahmini Yumila , Anaperta Megasyani , Yanti Iing Rika
Published: July 2019

Penelitian ini dilatarbelakangi rendahnya hasil belajar Fisika siswa karena masih kurangnya minat belajar siswa saat proses pembelajaran. Untuk mengatasi masalah tersebut penulis melakukan pembelajaran dengan menerapkan teka-teki silang. Penilaian pada ranah kognitif yaitu melalui tes akhir, pada ranah afektif melalui lembar observasi siswa dan pada ranah psikomotor menggunakan lembar penilaian psikomotor siswa. Teknik analisis data hasil belajar yaitu dengan menggunakan uji t, dan kemudian dilakukan perhitungan effect size untuk menentukan seberapa besar pengaruh yang diberikan. Berdasarkan dari perhitungan effect size diperoleh d sebesar 0,69 tergolong kedalam sedang. Jadi berdasarkan nilai rata-rata hasil belajar fisika siswa, pengaruh penggunaan teka-teki silang dalam pembelajaran discovery learning berpengaruh sedang dalam meningkatkan hasil belajar fisika kelas XI MIPA SMAN 14 Padang. Kata kunci :  Pembelajaran Fisika, Teka-teki Silang, Discovery Learning, Hasil     Belajar Fisika
ORGANIZATIONAL CLIMATE AND TEACHER PEDAGOGIC COMPETENCE ON QUALITY OF SERVICES IN SMP
Authors: JUFRI Hamid AL , PRIYONO Dwi
Published: July 2019

This study aims to determine the influence of Organization Climate and Teacher Pedagogic Competence School Quality Service in Public Junior High School District Kembangan in West Jakarta.This study is descriptive in the entire population of teachers in Public Junior High School in West Jakarta District of New Kebayoran as many as 7 State Primary School with a number of teachers is 347, elected by proportional random sampling, the number of 186 teachers. Data was collected using a questionnaire to measure the Organization Climate, Teachers and Achievement Motivation Teacher on School Quality Service.The results showed that: first, there are positive Influence of Total Quality Management to Principal Teacher School Quality Service is acceptable, it can be determined by t test calculations in which th> tt (40.38> 1.66). And based on the calculation formula product moment correlation coefficient can be determined path coefficients (p31 = 0.272) at α = 0.05, that rh> rt (0.948 > 0.148) means that it can be said that there are positive effects of TQM Head Teacher School Quality Service, by r213 = coefficient of determination of 0.8986. This means that 89.89% of the variation of Teacher School Quality Service (X3) are affected by TQM Principal (X1). Second, there is a positive influence on Achievement Motivation Teacher Teacher School Quality Service is acceptable, it can be determined by t test calculations in which th> tt (73.92> 1.66). Third, there is a positive influence Principal Total Quality Management (X1) of the Teacher Achievement Motivation (X2) can be accepted, it can be determined by t test calculations in which th> tt (32.31 > 1.66).
İRFAN ÖNÜRMEN RESMİNDE MALZEMENİN KATMANLI KULLANIMININ DUYUSAL KARŞILIKLARI ÜZERİNE BİR İNCELEME
Authors: GÜRAY CAN Zeynep
Published: July 2019

Bu çalışmada, ressam İrfan Önürmen’in çoklu medyum (malzeme)
kullanarak gerçekleştirmiş olduğu çalışmaların teknik boyutu ve bu boyutun
duyular üzerindeki etkisi incelenmiştir. Bu inceleme yapılırken, farklı
malzemelerin yaratmış olduğu katmanlı yapılar dikkate alınmıştır. Sanatçının
çalışmalarına hâkim olan malzemelerin bu katmanlı kullanımı, Gilles Deleuze ve
Felix Guattari’nin algılam ve duygulam kavramları ile ilişki kurularak
irdelenmeye çalışılmıştır.

Sanatçının çalışmalarını oluştururken ele almış olduğu malzemeler
çoğunlukla gazete kağıdı ve tüldür. Farklı malzemeler olsalar dahi, sanatçı bu
iki malzeme ile ortak bir dil birliği yaratmıştır. Bu bağlamda bu çalışmanın
problemi, Önürmen resminde, sanatçının malzemeyi ele alış biçimi ile ilişkili
olarak ortaya çıkan bu dil birliğinin duyular üzerindeki karşılığıdır.
ULUSAL GASTRONOMİ KİMLİĞİNİN GELİŞTİRİLMESİ VE TURİSTİK TANITIMINDA KARŞILAŞILAN SORUNLAR
Authors: BULUT Samuray Hakan
Published: July 2019

Bu çalışma gastronomi biliminin merkezde tutulduğu ulusal
düzeyde yapılmış akademik turizm araştırmalarının incelenmesi sonucu elde
edilen bilgiler ışığında; Türkiye’nin turizm potansiyelinin, ülkenin gastronomi
kimliği öne çıkarılarak arttırılması ve tanıtılması noktasında karşılaşılan
sorunları belirlemek amacıyla hazırlanmıştır. Araştırmada genel çerçevede
gastronomi bilimi hakkında bilinmesi gerekenler, yerel gastronomi ögelerinin
güncellenerek bilinirliklerinin arttırılması, coğrafi işaretleme kavramının
anlamlandırılması, turist rehberlerinin gastronomi bilgi-birikimleri, turizm
pazarlamasında gastronomi ve mutfak sanatlarının rolü, lisans düzeyinde
gastronomi eğitimi, gastronominin üretim-servis-tüketim aşamaları, bölgesel
gastronomi, yerli turistlerin gastronomi turizmine katkıları, gastronominin
sanatsal boyutu  gibi sayısız başlık
altında toplanması mümkün olan konularda, ülkemizde yapılmış bir çok akademik
çalışmanın değerlendirilmesiyle elde edilen ve ulusal gastronomi kimliğinin
turistik tanıtımda daha güçlü kullanılmasına engel teşkil ettiği düşünülen
problemlerin üzerinde durulmuştur.
Быть или не быть генеральным планам крупных городов
Authors: Gertsberg Lora
Published: July 2019

Статья написана в рамках дискуссии, возникшей в результате поручения В.В. Путина правительству за­менить генпланы крупных городов на стратегические планы для ускорения градостроительного обеспечения строительства. Мнения специалистов по данному во­просу разделились. Для того чтобы оценить целесо­образность такого решения анализируется опыт про­ектирования крупных российских городов в условиях плановой экономики. Также анализируется современный опыт Англии, включая законодательную базу в области стратегического градостроительного планирования, опыт разработки стратегического Плана Большого Лон­дона и локального плана города Лондона. Проведённый анализ позволяет прийти к выводу о том, что крупный город должен иметь стратегический план развития. Он включает видение, или миссию города, набор стратегий в разных сферах жизнедеятельности города (жилищная, промышленная, инфраструктурная, экологическая и др.), определение согласованной политики их пространствен­ной реализации, общей концепции пространственного развития города, направленных на достижение миссии города. Стратегический план крупного города должен разрабатываться на территорию города и прилегающие территории, с которыми осуществляется активная по­вседневная связь. Он должен иметь социальное и ре­сурсное обоснование, механизмы реализации, содержать показатели, по которым осуществляется мониторинг этой реализации. Основная цель этого плана  не уско­рить градостроительное обеспечение строительства, а способствовать формированию успешного города: ком­фортного, привлекательного для инвестиций, жителей и приезжих. Наличие стратегического плана не исключает необходимость разработки генеральных планов на круп­ные административнотерриториальные образования в рамках планируемой территории с целью детализации определённой для них стратегии. Эффективность планов зависит от применения современных технологий разра­ботки решений и управления их реализацией, а также от того, насколько социально и экономически обосновано видение города.
ESTUDO DOS RESÍDUOS DA CONSTRUÇÃO E DEMOLIÇÃO CIVIL NA CIDADES DE BARRA MANSA, RESENDE E VOLTA REDONDA
Authors: De Souza Sampaio Nilo Antonio , Silva Gabriela Alves da
Published: July 2019

O trabalho baseia-se na aplicação de ferramentas de gestão da qualidade, no setor de gestão de resíduos da construção civil, apontando volume de resíduos gerados nas cidades de Barra Mansa, Resende e Volta Redonda. Levando em consideração, logicamente, as normas do meio ambiente que regem a gestão correta dos resíduos. A utilização do fluxograma é o passo inicial do estudo, pois ela foi extremamente importante no mapeamento do processo, no caso, como é o caminho que o resíduo da construção civil faz até chegar no seu destino correto e se o seu manejo também está sendo realizado segundo as normas que o regem. Logo, o estudo segundo os dados encontrados, forneceu um volume de resíduos gerados pelo setor da construção civil, então foi utilizado o histograma para facilitar a visualização das partes críticas. De maneira geral, nessa fase do estudo já permitiu perceber a falta de apoio dos órgãos públicos, para diminuir os impactos ambientais e os gastos municipais excedentes com remoção dos resíduos que são lançados em lugares inadequados. A principal ferramenta aplicada e o foco do trabalho estão na ferramenta de qualidade FMEA, que é uma ferramenta que permite a identificação de falhas em um processo ou sistema antes mesmo de ocorrer. A escolha dessa ferramenta foi devida a falta de modelos de gestão de processo no setor da engenharia.
Hipotensão Ortostática na Doença de Parkinson: Revisão
Authors: Vilaça Celmir de Oliveria , Araujo Leite Marco Antônio , De Seixas Filho José Teixeira , Pessoa Bruno Lima , Breder Raphael , Ribas Marcia Antunes , Moreno Adalgiza Mafra , Orsini Marco
Published: July 2019

Objetivo: Revisão da literatura abordando o diagnóstico, fisiopatologia, complicações e tratamento da hipotensão ortostática em paciente com Doença de Parkinson. Método: Revisão não sistemática utilizando a plataforma Google Acadêmico de artigos abordando a hipotensão postural na Doença de Parkinson. Resultados e Discussão: Foram utilizados 65 artigos em inglês para confecção desta revisão. Conclusão: A hipotensão ortostática é um sintoma não motor frequentemente subdiagnosticado em pacientes com Doença de Parkinson. Pode estar associada a riscos de quedas com fraturas, déficit cognitivo e eventos vasculares, apresentando difícil tratamento. Recomenda-se rastreio da presença de hipotensão ortostática em todos os pacientes com Doença de Parkinson.Palavras-Chave: hipotensão ortostática, Doença de Parkinson, acidentes por quedas
TEATRO: DESENVOLVIMENTO E APRENDIZAGEM NA EDUCAÇÃO INFANTIL
Authors: Santos Anderson Oramisio , Da Mata Junior Delcio Geraldo
Published: July 2019

Este artigo visa analisar a importância que o teatro tem na formação e no desenvolvimento da criança, considerando-a como um ser que pensa, sente e faz. Seja no aspecto pedagógico ou no aspecto artístico, assistido ou encenado, o teatro auxilia a criança no seu crescimento cultural e na sua formação como indivíduo. Trata-se de uma pesquisa bibliográfica, apoiada em teóricos que discutem o tema. A escola é um espaço de conhecimento e aprendizagem, assim, as artes- música, literatura, pintura, escultura, teatro- passam a ser fundamentais para o desenvolvimento perceptivo da criança, contribuindo para sua socialização e comunicação social.
TEXTOS JORNALISTICOS NAS PRÁTICAS DE LEITURA E ESCRITA NAS AULAS DE MATEMÁTICA NOS PRIMEIROS ANOS DO ENSINO FUNDAMENTAL
Authors: Santos Anderson Oramisio , Da Mata Junior Délcio Geraldo , Da Silva Graciela Nunes
Published: July 2019

ResumoO objetivo deste estudo é aprofundar nossas reflexões sobre Alfabetização Matemática e Linguagem Matemática nas séries iniciais do Ensino Fundamental, a fim de situar a Matemática no contexto da apropriação dos processos de leitura e escrita, utilizando-se textos matemáticos e da Linguagem Natural em sala de aula, um método importante para os primeiros anos do Ensino Fundamental, sob a perspectiva de aprendizagem situada. A leitura pode contribuir significativamente para promover a aprendizagem desta matéria, motivando os alunos à participação ativa das aulas e estimulando neles o interesse pelas pesquisas matemáticas na busca de solução de problemas. O estudo é de caráter qualitativo, fundamentado em revisão de literatura. Os resultados obtidos na pesquisa são discutidos no decorrer do desenvolvimento do texto, esperando contribuir para a que o professor exerça seu papel de orientador junto às crianças na contextualização dos textos selecionados para esta finalidade. As teorias de diversos autores consultados sobre leitura, linguagem e textos matemáticos trazem-nos a compreensão pedagógica para análise dos dados. Como resultados relevantes, pode-se destacar a importância da articulação da língua materna com a linguagem matemática utilizada no ensino escolar e a necessidade de estimular, no aluno, diferentes capacidades de expressão da linguagem.Palavras-chave: Educação Matemática. Textos Matemáticos. Matemática. Investigação.
Avaliação mecânica e microestrutural do polipropileno
Authors: Mecnhise Claudio Alvares , Campbell Carlos Henrique , Cabral Ricardo , Da Cunha Lovato Ana Carolina , Silva de Oliveira Pedro Henrique , De Faria Pedro Tavares , Gomes Filho Sebastião Domingos , Guedes Vitor Firmino
Published: July 2019

A utilização de polímeros vem crescendo mundialmente. Esse crescimento se deve a facilidade de acesso ao monômero propileno, onde o mesmo é obtido através de gás natural. Sua aplicação vem se diversificando e consequentemente novos e constantes estudos sobre suas propriedades e características se fazem necessários. Este trabalhotem por objetivo avaliar os resultados mecânicos e morfológicos do polipropileno (PP), com aplicação de testes de dureza, tração e flexão, seguidos das análises de microscopia ótica e Microscopia Eletrônica de Varredura (MEV). Os resultados obtidos confirmam que o PP analisado possuidureza Shore D média de 62,25 HSD, Tensão Máxima de Tração Média de 28,65MPa e Tensão Máxima de Flexão Média de 44,93MPa. Os valores encontrados são compatíveis com os esperados para sua utilização nas indústrias de bens de consumo, automotiva e aeronáutica.
PENGARUH MODEL PEMBELAJARAN ADVANCE ORGANIZER TERHADAP KEMAMPUAN SISWA MENGANALISIS MATERI BENTUK MOLEKUL KELAS X IPA SMA NEGERI 10 KOTA JAMBI
Authors: Suharti Kiki
Published: July 2019

Penelitian ini dilatarbelakangi oleh kesulitan yang dialami siswa diantaranya kesulitan dalaM menganalisis materi bentuk molekul dan kesulitan menghubungkan rumus-rumus penentuan bentuk molekul. Penerapan model pembelajaran yang tepat merupakan salah satu alternatif untuk mengatasi masalah tersebut. Salah satu model pembelajaran yang dapat diterapkan adalah model pembelajaran advance organizer. Penelitian ini bertujuan untuk mengetahui adanya pengaruh model pembelajaran advance organizer terhadap kemampuan siswa menganalisis materi bentuk molekul kelas X IPA SMA Negeri 10 Kota Jambi. Jenis penelitian yang dilakukan adalah Quasi-Eksperimen dengan desain the matching-only posttest only control group design. Teknik pengambilan sampel dilakukan dengan purposive sampling. Instrumen yang digunakan yaitu lembar observasi keterlaksanaan model oleh guru dan siswa serta tes kemampuan siswa menganalisis. Pengujian hipotesis dengan uji t untuk melihat keterlaksanaan model pembelajaran advance organizer dengan kemampuan siswa menganalisis. Metode t-test yang digunakan berjenis polled varian. Keterlaksanaan model pembelajaran advance organizer oleh guru sebesar 35,33% (baik) dan siswa sebesar 29,51% (cukup baik). Hubungan keterlaksanaan model advance organizer dan kemampuan siswa menganalisis diperoleh rxy= 0,5038 dengan tingkat hubungan pada kategori sedang dan uji t sebesar 3,92, sehingga hipotesis penelitian (Ha) diterima. Hasil analisis data tes kemampuan siswa menganalisis materi bentuk molekul, kedua kelas sampel memiliki distribusi normal dan varian homogen, pada uji-t diperoleh thitung =  3,91 dan ttabel =  1,998 dengan dk 64 dan a = 0,05, maka thitung > ttabel  atau (3,91 > 1,998) dengan dk=32+34-2=64,  pada derajat signifikan 95%. Berdasarkan hasil penelitian, disimpulkan bahwa terdapat perbedaan antara pembelajaran dengan menggunakan model advance organizer dan model direct instruction terhadap kemampuan siswa menganalisis pada materi bentuk molekul di kelas X SMAN 10 Jambi.
Aluminium/zirconium alloys obtained by Al underpotential deposition onto Zr from low temperature AlCl3+NaCl molten salts
Authors: Cvetkovic Vesna , Jovicevic Niko , Vukicevic Natasa , Jovicevic Jovan
Published: July 2019

Contrary to the widely accepted hypothesis that it is not possible, aluminium
underpotential deposition (UPD) onto zirconium from a low temperature (200,
250 and 300?C) equimolar chloroaluminate melt was recorded. Furthermore, it
was shown that aluminium UPD facilitates alloy formation between the
deposited aluminium monolayer and the zirconium substrate by interdiffusion.
The aluminium/zirconium alloys formed at the temperatures substantially
lower than those needed for thermal preparation of the same alloys were:
Al3Zr2 and Al3Zr. Experimental techniques used were linear sweep
voltammetry, potential step, scanning electron microscope, energy dispersive
spectroscopy and X-ray diffraction were used for characterization of
obtained electrode surfaces.
Conditioned pain modulation assessment using contact heat as conditioning stimulus and two different test stimuli
Authors: Knezevic Aleksandar , Kovacevic Milena , Klicov Ljiljana , Pantic Magdalena , Vasin Jana , Spasojevic Tijana
Published: July 2019

Introduction. The objective of the study was to determine the potentials and
reliability of conditioned pain modulation effect in healthy population by
application of a conditioning contact heat stimulus, and heat and pressure
applied to the low back region as a test stimulus. Material and Methods. The
study included 33 healthy subjects (average age 25.73 ? 5.35 years).
Pressure and heat pain thresholds were examined on the paravertebral
musculature of the lower back as test stimuli. Contact heat was used on the
contralateral forearm as a conditioning stimulus. Conditioned pain
modulation was calculated as the difference between pain thresholds after
and before conditioning stimulus application. To assess the reliability,
identical testing was performed 14 ? 2 days later. Results. The pressure and
heat pain thresholds, after the conditioning stimulus, were significantly
higher compared to pain thresholds obtained before the conditioning stimulus
(101,63 N/cm2 ? 45,21N/cm2 vs 82,15 N/cm2 ? 36,15 N/cm2, t = -7,528, p <
0,001 and 47,08?C ? 2,19o C vs 45,00 ? 3,05?C, t = -6,644, p < 0,001,
respectively). The reli?ability of the same protocol, measured 14 ? 2 days
after the previous testing, showed good reliability of the pressure pain
threshold (intraclass correlation coefficient = 0,636, 95% confidence
interval 0,240 - 0,825), and fair of the heat pain threshold (intraclass
cor?relation coefficient = 0,435, 95% confidence interval - 0,070 - 0,713).
Conclusion. Conditioned pain modulation was successfully induced by contact
heat applied via a thermode, a conditioning stimulus. The reliability of
this method of testing proved to be fair when it comes to the heat pain
threshold and good when it comes to the pressure pain threshold.
Epidemiological characteristics of the most common zoonoses in the central Banat district of Vojvodina from 2002 to 2016
Authors: Popov Svetlana , Strbac Mirjana , Ristic Mioljub
Published: July 2019

Introduction. The aim of this study was to determine the epidemiological
characteristics of the most common zoonoses in the Central Banat District
of Vojvodina. Material and Methods. A descriptive epidemiological study was
conducted using data of the Centers for Disease Control and Prevention of
the Institute of Public Health of Vojvodina and Public Health Institute
Zrenjanin. The data for this study were collected from January 1, 2002 to
December 31, 2016. Results. Apart from Q fever, which showed a stable
incidence, the trend of incidence rates of other two zoonoses decreased
between 2002 and 2016. Q fever was three times more common in males than
females, while the incidence of males and females was similar among patients
with Trichinellosis and Salmonellosis. Regarding the age distribution, the
highest average incidence rate (12/100,000) of Trichinellosis was reported
in patients aged 20-39 years; Salmonellosis predominated among patients
aged 0-19 years (64.6/100,000), and Q fever in the 20-39 age group
(9.2/100,000). Pork products were the most common source of outbreaks of
Trichinellosis, while cakes and cookies were the most common source of
outbreaks of Salmonelloses. Out of 92 interviewed patients with Q fever, 50
(54.3%) had a direct daily contact with their domestic animals during the
maximum incubation period. Conclusion. In order to improve evaluation of
epidemiological characteristics of the most common zoonoses and consequently
their control in a timely manner, efficient exchange of information between
health sectors for humans and animals is necessary, along with continuous
education of food handlers and the general population of the Central Banat
District of Vojvodina.
Significance of delayed surgical treatment of symptomatic non-ruptured abdominal aortic aneurysm
Authors: Budinski Slavko , Pasternak Janko , Manojlovic Vladimir , Markovic Vladimir , Nikolic Dragan
Published: July 2019

Introduction. An abdominal aortic aneurysm is a permanent focal dilation of
the blood vessel wall to about 1.5 times larger than the normal diameter.
Clinically, it may be divided into symptomatic and asymptomatic. It is
still discussed whether patients with symptomatic non-ruptured abdominal
aortic aneurysm benefit more from emergency or delayed surgical treatment.
The aim of the study was to evaluate the results of the symptomatic
non-ruptured aneurysms in regard to the diameter of ruptured and
non-ruptured symptomatic aneurysms and the impact of the time elapsed from
admission to surgery on its outcome. Material and Methods. The
retrospective study included all 133 patients who underwent surgery due to
symptomatic non-ruptured or ruptured abdominal aortic aneurysm at the
Clinic of Vascular and Endovascular Surgery during the previous 3 years.
Results. Out of a total of 133 patients, 75.19% underwent surgery in the
first 24 hours after admission, while the rest 24.81% of patients were
operated later. Intraoperative complications were recorded only in patients
with ruptured aneurysms, 4% had cardiac arrest and 1.5% of patients had
fatal outcome. The in-hospital mortality was 16.67% in patients with
non-ruptured aneurysm of the abdominal aorta operated in the first 24
hours, and 9.91% in patients who were operated after 24 hours after
admission. Conclusion. Early elective surgery is a method of choice in the
treatment of symptomatic non-ruptured aneurysm of the abdominal aorta.
However, surgical treatment in the first 24 hours is associated with a
higher mortality rate than surgery after 24 hours after admission. Also,
there is no statistically significant difference in the diameter of ruptured
and non-ruptured symptomatic aneurysms, but the average size of the aneurysm
diameter is higher in ruptured than in non-ruptured aneurysms, which
confirms the fact that the increase in diameter increases the risk of
aneurysm rupture.
Dry eye syndrome and cataract surgery
Authors: Brunet Stefan , Canadanovic Vladimir , Babic Nikola , Miljkovic Aleksandar , Jovanovic Sandra , Barisic Sava
Published: July 2019

Introduction. Dry eye syndrome has become a common problem after ocular
surgeries with a significant impact on the quality of life. Many patients,
who have undergone cataract surgery, postop?eratively developed dry eye
symptoms. Dry eye syndrome is one of the risk factors associated with
cataract surgery. Material and Methods. The prospective study included 80
patients. We recorded the self-reported dry eye symptoms, the values of
Schirmer test, tear breakup time, and best corrected visual acuity
preoperatively, as well as 7 days and 1 month after the surgery. Results. A
total of 80 patients were included in the study, 45 (56.2%) females and 35
(43.8%) males. The mean age of patients was 61.5 years (SD ? 6.2, range 57 -
70 years). The best corrected visual acuity at the time of surgery was 0.4
or less in 70 patients (87.5%). Most patients reported a significant
improvement in visual acuity after surgery; 68 (85%) eyes achieved a best
corrected visual acuity of 0.5 or higher (median 0.7; range 0.5 - 1.0). The
mean tear breaking time in cata?ract patients before surgery was 12.4 sec, 7
days after the surgery it was 8.2 sec (p < 0.05) and 1 moth after the
surgery 11.1 sec. The majority of patients had mild (47.5%) and moderate
(33.75%) Schirmer test values. Dry eye with wetting < 5 mm after 5 minutes
was found in 16.2% of patients before cataract surgery; 7 days after the
surgery (p < 0.05) it was found in 23.75% of patients and one month after
surgery 11.1 sec. A foreign body sensation and watery eye were the most
reported symptoms before cataract surgery. Seven days after the surgery
foreign body sensation was present in 48.75% and watery eyes in 40% of
patients. Conclusion. Significant increase in dry eye symptoms after
cataract surgery was found with increasing age. Self reported dry eye
problems are more common in patients with lower Schirmer test and best
corrected visual acu?ity values before cataract surgery. Patients with
concomitant dry eye disease require preoperative and postoperative treatment
of dry eye to prevent aggravation of the existing symptoms that may affect
the visual outcome after cataract surgery.
Sedation in the intensive care unit
Authors: Tatic Milanka , Miskovic Skeledzija , Zdravkovic Ranko , Gojkovic Milica , Kovac Aleksandra , Zubic Maja
Published: July 2019

Introduction. Sedation is the reduction of irritability or agitation by the
use of certain drugs mostly to facilitate therapeutic or diagnostic
procedures. Scales for evaluation of the depth of sedation. Riker
Sedation-Agitation Scale and Richmond Agitation-Sedation Scale are the most
commonly used scales. Drugs. Sedation is generally produced by using
medications from the group of opioids, benzodiazepines, intravenous and
inhalation general anesthetic agents, neuroleptics, phenothiazines,
?-agonists and barbiturates. Adverse effects of sedatives. Sedation is
often associated with hypotension, prolonged mechanical ventilation and
longer time on respiratory support, higher frequency of delirium,
immunosuppression, deep vein thrombosis, increased risk for development of
nosocomial pneumonia, all of which leads to the prolonged recovery time.
Conclusion. Sedatives currently used in intensive care units are widely
used, but they have limitations. The goal is to get the desired level of
sedation with as few side effects as possible.
Mechanical properties and band structure of CdSe and CdTe nanostructures at high pressure - a first-principles study
Authors: Kishore Natarajan , Nagarajan Veerappan , Chandiramouli Ramanathan
Published: July 2019

First-principles calculations for CdSe and CdTe nanostructures were carried
out to study their mechanical properties and band structure under the
uniaxial pressure range of 0 to 50GPa. It was presumed that the CdSe and
CdTe nanostructures exist in the zinc-blende phase under high pressure. The
mechanical properties, such as elastic constants, bulk modulus, shear
modulus and Young?s modulus, were explored. Furthermore, Cauchy pressure,
Poisson?s ratio and Pugh?s criterion were studied under high pressure for
both CdSe and CdTe nanostructures, and the results show that they exhibit
ductile property. The band structure studies of CdSe and CdTe were also
investigated. The findings show that the mechanical properties and the band
structures of CdSe and CdTe can be tailored with high pressure.
Examination of novel electrosprayed biogenic hydroxyapatite coatings on si3n4 and Si3N4/MWCNT ceramic composite
Authors: Zagyva Tamás , Balázsi Katalin , Balázsi Csaba
Published: July 2019

Novel hydroxyapatite coatings on Si3N4 and Si3N4/MWCNT ceramic substrates
were deposited by electrospraying method for the first time. The aim of this
study was to produce thin nano-hydroxyapatite (nHA) layer on silicon nitride
(Si3N4) implant material with a cost-efficient electrospray deposition
method. During the first experiments, continuous nHA layer could not form
due to the high electrical resistance of the Si3N4 substrate. Therefore, the
electrical conductivity of the Si3N4 substrate has been increased by the
help of multiwall carbon nanotube (MWCNT) addition. As a result, ~5 ?m thick
continuous and smooth nHA coating could have been realized successfully on
the Si3N4/MWCNT composite.
Development of bioactive and biocompatible ceramic composites based on potassium polytitanate
Authors: Villalpando-Reyna Ángel , Cortés-Hernández Dora , Granjeiro Jose , Prado Marcelo , Gorokhovsky Alexander , Escobedo-Bocardo José , Almanza-Robles José , Rentería-Zamarrón David
Published: July 2019

Bioactive and biocompatible composites were successfully prepared by reactive
sintering of mixtures of a crystalline titanate precursor and 45S5
Bioglass?. The polytitanate/glass precursor ratios were 20/80, 40/60, 60/40
or 80/20 (wt.%). The powder mixtures were uniaxially pressed and heat
treated at 1000 ?C for 1 h. During sintering, intensive interactions between
raw materials occurred. The formed main crystalline phases were: potassium
hexatitanate (K2Ti6O13), calcium titanate (CaTiO3), calcium silicate
(CaSiO4) and sodium-calcium silicate (Na6Ca3Si6O18). Additionally, a Si-rich
glassy phase was also observed. The mechanism of apatite formation indicated
that both crystalline and amorphous phases play important roles in this
process. A homogeneous apatite layer was formed on Si-OH, Ti-OH-rich
interfaces. In vitro bioactivity was assessed using simulated body fluid
(SBF K-9). The in vitro cytotoxicity behaviour was evaluated using a human
osteoblastlike cells model and compressive strength by ASTM C-773 standard.
All the composites demonstrated high bioactivity as cytotoxicity assays
indicated a biocompatibility similar to that of the negative control. The
samples showed high cell adherence and elongation cell characteristics
similar to those observed on biocompatible systems. The compressive strength
of the sintered samples decreased as the polytitanate content precursor was
increased. The results obtained indicate that these materials are highly
promising composites for medical applications.
Stable CuCrO2 nanoparticles - ZnO fibres p-n heterostructure system for effective photocatalytic activity
Authors: Baylan Elif , Akyildiz Hasan , Yildirim Ozlem
Published: July 2019

Heterostructured photocatalysts were fabricated by coupling electrospun
n-type ZnO fibres and hydrothermally derived p-type CuCrO2 nanoparticles.
The effect of the amount of CuCrO2 nanoparticles on the photocatalytic
activity of the heterostructured photocatalyst was systematically
investigated. The formation of the heterojunctions between the two
semiconductors was revealed via detailed XRD, XPS, TEM and optical property
measurements. The experimental results indicated that the optimal CuCrO2
amount in the composite photocatalyst was 1.0wt.% due to the optimum doping
and surface coverage, higher absorption onset edge, larger absorption
intensity and optimum band gap energy. This composite photocatalyst,
fabricated by drop casting of CuCrO2 nanoparticle dispersion on ZnO fibres,
displayed 30% higher rate constant (k) value compared to the pure ZnO fibres
in the degradation of methylene blue dye molecules and reached 93.4%
decomposition in 1 h under UV-visible light exposure. The obtained results
are highly encouraging in comparison to only UV/light active p-n
heterostructured photocatalysts previously reported in literature.
Therefore, we believe that the proposed approach here opened the way for
simple synthesis of highly-efficient visible light active heterostructured
semiconductor photocatalyst systems.
Processes connected with local laser heating of TiB2 armor ceramics
Authors: Vlasova Marina , Kakazey Mykola , Aguilar Pedro , Tapia Rene , Hernandez Adalberto , Mel'nikov Igor , Fironov Yakov , Uribe Daniel
Published: July 2019

The process of high-temperature heating of TiB2 armor ceramics in air in a
continuous and pulsed mode of laser irradiation has been studied by the
X-ray diffraction and SEM methods. It has been established that, in the
irradiation zone, the temperature increases up to 3000 ?C and over,
resulting in the decomposition of TiB2 and appearance of ablation products,
which, in passage of air, oxidize and form dense films (in the pulsed mode)
or ?reticulated? films (in the CW mode) consisting of boron and titanium
oxides. The mechanism of laser-induced breakdown of TiB2 ceramics is similar
to the mechanism of ballistic destruction.
Numerical modeling of the porosity influence on the elastic properties of sintered materials
Authors: Abdulrazag Elmiladi , Balac Igor , Colic Katarina , Grbovic Aleksandar , Milovancevic Milorad , Jelic Milos
Published: July 2019

The effect of structural porosity on the elastic properties of sintered
materials was studied using the new multi-pore unit cell numerical model -
MPUC. Comparison between proposed MPUC model and previously adopted
two-phase unit cell - FCC numerical model as well as available experimental
data in literature, was done by comparing obtained values for modulus of
elasticity - E, shear modulus - G and Bulk modulus - K. Results obtained by
proposed MPUC model are in excellent agreement with available experimental
data in literature. It was confirmed that material porosity regarding pores?
size (volume fraction) has noticeable influence on elastic properties of
sintered material. Less porosity in the material microstructure generally
leads to noticeable higher values of E, G and K. For fixed volume fraction,
shape of pores has no significant influence on elastic characteristics.
Effect of silver nanoparticless in the structure and mechanical properties of mullite/Ag cermets
Authors: Téllez-Arias Gabriela , Miranda-Hernández José , Olea-Mejía Oscar , Lemus-Ruiz J. , Terrés Eduardo
Published: July 2019

The objective of this work was to study the influence of the addition of
silver nanoparticles in the microstructure of mullite at two different
temperatures of sintering (1500 and 1600?C), in order to decrease the
porosity and increase the density as well better the hardness and fracture
toughness. The microstructural characteristics were studied by scanning
electron microscopy, confocal scanning microscopy and X-ray diffraction.
Mullite/Ag cermets with homogenous microstructure were and a fracture
toughness of 2.42 MP??m1/2.
Effect of reduced Al2O3 mole ratio on fabrication of cordierite ceramic by solid-state sintering method
Authors: Li Ye , Zhao Hengze
Published: July 2019

Cordierite ceramic was fabricated by reducing Al2O3 mole ratio from 2.0 to
1.4 with kaolin, silicon dioxide and magnesium oxide as the raw materials.
The effect of reduced Al2O3 mole ratio on the sintering behaviors, phase
transition, main properties, and microstructure were characterized in
detail. The results show that cordierite phase becomes the main
crystallization phase at 1300?C, and mullite phase can be consumed to
produce cordierite phase by reducing Al2O3 mole ratio. But additional quartz
phase still exists until 1400?C. Moreover, the open porosity, pore
connectivity and pore size increase as Al2O3 mole ratio reduces from 2.0 to
1.4 while the linear shrinkage percent and bulk density decrease with the
reduced Al2O3. It is considered that the sintering activity of the raw
materials at low temperature decreases due to the increase of chemically
pure magnesium oxide and silica with the decrease of Al2O3 mole ratio, while
the crystallization process, pore growth and cordierite phase rather than
the liquid phase control the densification process at high temperature.
Effect of deposition current density and annealing temperature on the microstructure and magnetic properties of nanostructured Ni-Fe-W-Cu alloys
Authors: Spasojevic Milica , Markovic Dusan , Spasojevic Miroslav , Vukovic Zoran , Maricic Aleksa , Ribic-Zelenovic Lenka
Published: July 2019

Ni-Fe-W-Cu alloy powders were obtained by electrodeposition from an ammonium
citrate bath at current densities ranging between 70 and 600 mA cm-2. As the
deposition current density increased, the contents of Fe and W in the alloy
increased, and those of Ni and Cu decreased. The total cathodic polarization
curve was recorded, and partial polarization curves for Ni, Fe and W
deposition and hydrogen evolution were determined. The current efficiency of
alloy deposition was measured. The powders contained an amorphous matrix and
FCC nanocrystals of the solid solution of Fe, W and Cu in Ni. At high
current densities, small-sized nanocrystals exhibiting high internal
microstrain values were formed. Powder particles were dendrite- and
cauliflower-shaped. The dendrites had a large number of secondary branches
and higher-order branches containing interconnected globules. The density of
branches was higher in particles formed at high current densities. The
powders formed at high current densities exhibited higher magnetization.
Annealing at temperatures up to 460?C resulted in structural relaxation,
accompanied by an increase in magnetization. At temperatures above 460?C,
amorphous matrix crystallization and FCC crystal growth took place,
accompanied by a decrease in magnetization.
Second-order symmetric duality in multiobjective variational problems
Authors: Sachdev Geeta , Verma Khushboo , Gulati T.R.
Published: July 2019

In this work, we introduce a pair of multiobjective second-order symmetric dual variational problems. Weak, strong, and converse duality theorems for this pair are established under the assumption of ?-bonvexity/?-pseudobonvexity. At the end, the static case of our problems has also been discussed.
Investigation of Effects of Fiber Orientation Angles on Deflection Behavior of Cantilever Laminated Composite Square Plates
Authors: EVRAN Savaş
Published: July 2019

In this study, the deflection response of cantilever
laminated composite square plates subjected to the weight of itself was
analyzed using finite element and Taguchi methods. The plates with 12 plies
were made of glass fiber reinforced polymer composites (GFRP). The arrangements
and fiber orientation angles of the plies were conducted using Taguchi’s L9
(33) orthogonal array. Each four plies was assumed to be control factor. Fiber
orientation angles were varied from 10 to 90 in degree. Plates were modelled
using finite element software ANSYS Parametric Design Language. Analysis of
signal-to-noise (S/N) ratio was used in order to evaluate the control factors
with the optimum levels for minimum deflection response. Analysis of variance
was carried out in order to analyze the powerful influential control factors
and their percent contributions on responses.
Oxidation behavior and control method in laser solid forming of Rene 104 superalloy
Authors: Ying Wei-Sheng , Han Fuzhu , Wang Jun-Hua
Published: July 2019

To meet the increasing demand for complex-shaped components in aeronautical and naval industries, laser solid forming (LSF) technology has been used in the fabrication and field repair of superalloy components. In this study, fabricating Rene 104 superalloy parts by LSF was experimentally investigated. However, a severe oxidation problem was found in the LSF Rene 104 superalloy part even if the manufacturing area was protected by shielding gas, and the oxides would badly affect the mechanical performance of the LSF part. An optical microscope, a field emission scanning electron microscope, an energy dispersive x-ray spectrometer, and an x-ray diffractometer were used to analyze the oxidation phenomenon. The experimental result demonstrated that Al2O3 and Ti2O3 were the main components of oxides in the LSF sample and the oxidation problem deteriorated when the laser power increased. The reasons for the formation of oxides were analyzed according to the results from the temperature field simulation and oxygen concentration testing experiments. To solve the oxidation problem, a new method to control oxidation was proposed and a new protection device was designed in this study. The effect of the new method was verified by experiments, and the result showed that the oxygen concentration in the manufacturing area was effectively controlled using the new protection device and the oxidation of Rene 104 superalloy was prevented. It is believed that the new protection device can replace the glove box in the fabrication and field repair of large superalloy parts.