bluuebunny/crossref_metadata_2025 huggingface dataset:
Ethnie und Nation als semantische Reservoirs virtueller musikbezogener Differenzkonstruktionen
Authors: Sachsse Malte
Published: October 2019

Die Videoplattform YouTube spielt eine wichtige Rolle im Rahmen der Mediensozialisation Jugendlicher. Als Nutzer*innen sowie potentielle Akteur*innen haben sie Teil an komplexen Sinnbildungsprozessen, die sich in einschlägigen Kommentarbereichen als temporäre, arbiträre und intermedial formatierte Wissensordnungen konstituieren. Derartige Ordnungen zu dekonstruieren ist von hoher musikpädagogischer Relevanz insofern, als - u.a. mit Lucy Green - angenommen werden kann, dass außerschulischen, informellen Erfahrungsräumen eine zentrale Funktion bei der Ausbildung von Identität und Sozialität zukommt und ihre Kenntnis daher essentiell für die Diskussion musikpädagogischer Perspektiven auf informelles Lernen, interkulturelle Musikpädagogik und digitalbasierten Unterricht ist. Im Beitrag wird ein Kommentarbereich zu einem Amateurvideo mit türkischer Musik auf die in ihm verhandelten Vorstellungen von Ethnizität und Nationalität diskursanalytisch (i. S. v. Reckwitz) untersucht. Ziel ist es dabei, Praktiken der virtuellen Differenzkonstruktion innerhalb eines relevanten Bereichs jugendkultureller Erfahrungswelten des »Web 2.0« zu beschreiben und zu systematisieren. Auf dieser Grundlage werden musikpädagogische Perspektiven diskutiert mit Blick auf das aufscheinende Spannungsfeld zwischen der beobachteten Wirksamkeit von Grenzziehungen bei der Orientierung in musikalischer Vielfalt auf der einen, dem Anspruch an einen wertschätzenden Umgang mit Differenz im Rahmen eines allgemeinbildenden Musikunterrichts auf der anderen Seite
‘If They Don’t Care, I Don’t Care’: Millennial and Generation Z Students and the Impact of Faculty Caring
Authors: Miller Amy Chasteen , Mills Brooklyn
Published: October 2019

This article draws on a qualitative study of 31 Millennial and Generation Z students to examine the meaning of teacher “caring” in a higher education context. Prior research clearly documents the importance of caring to student engagement, although much of that scholarship focuses on secondary schooling. Research also examines the changing demographics of higher education and new expectations brought to college classrooms by Millennials and others. In this article, we connect the existing research on caring and on generational differences to explore how traditional-aged undergraduates define caring and the degree to which that impacts their willingness to learn. Our findings indicate that students value approachability and relatability as traits in a caring professor; we also find that in-class pedagogical practices can dramatically demonstrate care or lack thereof. Our research suggests that the student success agenda in higher education must take in-class teaching practices seriously in order to impact students’ engagement and motivation to learn.
Detección de Candidatos a Microcalcificaciones Mamarias Agrupadas en Mamografías
Authors: Sandino Garzon Alvaro Andres , Herrera García Rodrigo Javier
Published: October 2019

Contexto: Las microcalcificaciones mamarias son lesiones no palpables que están presentes aproximadamente en el 55% de los casos de cáncer de mama; son un hallazgo muy frecuente en mamografías y pueden ser un indicador de esta enfermedad en sus primeras fases.

Método: Se implementó un método para el realce de microcalcificaciones mamarias basado en análisis multirresolución a través de la transformada wavelet. Posteriormente se realiza una segmentación aproximada de candidatos utilizando los parámetros estadísticos de la distribución de coeficientes y se seleccionaron aquellos que cumplían con ciertos parámetros de longitud y distribución. Por último, se emplea un modelo de clasificación binaria utilizando máquinas de soporte vectorial para clasificar imágenes con microcalcificaciones mamarias agrupadas.

Resultados: Se realizó la tarea de clasificación binaria entre imágenes con tejido mamario sano y con microcalcificaciones utilizando una máquina de soporte vectorial (Support-vector machine, SVM, por sus siglas en inglés) utilizando kernel lineal. Las métricas de evaluación para el algorítmo fueron: área bajo la curva (AUC) de 93.6 %, precisión de 89.4 %, sensibilidad de 88.4% y especificidad de 90.5 %.

Conclusiones: En el presente trabajo se utilizó el tamaño y la distribución como criterios para la segmentación y caracterización de microcalcificaciones mamarias agrupadas, que en la evaluación clínica son medidas cuantitativas para la detección de cáncer de seno en sus primeras etapas. Dado que el tejido mamario presenta un bajo contraste se propuso un método de realce que logra desenmascarar algunas microcalcificaciones que son poco evidentes. Con el enfoque propuesto se logró clasificar correctamente la mayoría de imágenes de tejido mamario con microcalcificaciones agrupadas ya sea en distribuciones

segmentarias, lineales o ramificadas.
Elevation of serum adiponectin in mildly decreased glomerular filtration rate
Authors: Mahima Apinya , Kongkhum Sudawadee , Bordeerat Narisa Kengtong , Fongsupa Somsak , Rerksngarm Thaval , Siripurkpong Pilaiwan
Published: October 2019

Background

Adiponectin secreted by adipocytes plays a key role in insulin sensitivity, anti-inflammation, and antiatherosclerosis. It is involved in several conditions including obesity, type 2 diabetes mellitus, cardiovascular disease, and chronic kidney disease (CKD). Glomerular filtration rate is monitored to indicate the kidney function and CKD progression.

Objective

To assess the serum adiponectin levels in individuals with normal and mildly decreased glomerular filtration rate, analyze the association of serum adiponectin with various physical and biological parameters, and test whether serum adiponectin is the risk factor of mildly decreased glomerular filtration rate.

Methods

This cross-sectional study was conducted in 172 individuals with 35–60 years of age. Serum samples were collected and divided into two groups, based on estimated glomerular filtration rate (eGFR): 90 with normal eGFR (G1, eGFR ≥90 mL/min/1.73 m2) and 82 with mildly decreased eGFR (G2, eGFR = 60–89 mL/min/1.73 m2). Anthropometric data were recorded. Serum adiponectin was measured by enzyme-linked immunosorbent assay.

Results

Serum adiponectin levels were significantly increased in individuals with mildly decreased eGFR (G2), compared to G1 (8.23 ± 3.26 µg/mL and 6.57 ± 3.24 µg/mL, respectively; P = 0.001). Serum adiponectin was positively associated with age and high-density lipoprotein cholesterol but negatively associated with weight, body mass index, triglyceride, and waist and hip circumferences. Univariate analysis showed that serum adiponectin was significantly correlated with mildly decreased eGFR; however, when adjusting for confounding factors, there were no correlations. Furthermore, multivariate regression analysis showed that individuals at the age of 46–55 years (4.0; 95% CI: 1.9–8.3) and > 55 years (11.4; 95% CI: 3.7–35.5) were significantly correlated with mildly decreased eGFR.

Conclusions

Serum adiponectin was significantly elevated in individuals with mildly decreased eGFR and may be a modulation factor, but was not an independent risk factor for mildly kidney damage. Further study is needed to clarify its potential benefits as monitoring biomarker for CKD progression.
Clinical outcomes of acute respiratory distress syndrome in a university hospital
Authors: Sanguanwong Natthawan , Kongpolprom Napplika
Published: October 2019

Background

Mortality rates of acute respiratory distress syndrome (ARDS) are different, depending on severity, etiology, and management.

Objective

To determine 7-day and 28-day mortalities, hospital length of stay (LOS), duration of mechanical ventilation (MV) of ARDS patients, and factors associated with poor outcomes.

Methods

A retrospective study was conducted to review the database of ARDS patients admitted in medical intensive care units (ICUs) at a university hospital between 2010 and 2014. The cases were identified by using International Classification of Diseases, 10th Revision (ICD-10) code-J80 ARDS.

Results

Of 266 patients, 11.7%, 44.4%, and 44% fulfilled mild, moderate, and severe ARDS criteria, respectively. The main cause of ARDS was pneumonia. The 7-day and 28-day mortalities, median LOS, and median MV duration were 31.1%, 69.3%, 18, and 11 days, respectively. Pressure control was the most favorite mode, used with average tidal volume (TV) of 8.63 (2.16) mL/kg ideal body weight (IBW). Recruitment maneuver was most frequently used as adjunctive intervention, whereas prone position was applied to 3.75% of the patients. One-third of the patients received neuromuscular blockades. The median 7-day fluid balance was +6,600 mL. The mean PaO2/FiO2 ratio during the first 3 days, cumulative fluid balance on day 3, and average daily calories during the first week were independent predictors for adjusted 7-day mortality, whereas Acute Physiology and Chronic Health Evaluation (APACHE II) score, fluid balance on day 1, cumulative fluid balance, and average daily calories during the first week were independent predictors for adjusted 28-day mortality.

Conclusions

The 28-day mortality of ARDS was high. In addition, TV and fluid balance were greater than protective limits. These findings indicated the potential improvement of ARDS outcomes in our hospital.
Proportion of vulvar premalignant and malignant lesions in overall vulvar specimens in Thailand
Authors: Trongpisutsak Ananya , Tantbirojn Patou , Lertkhachonsuk Ruangsak
Published: October 2019

Background

Vulvar lesion is one of the common gynecologic problems.

Objective

To assess the proportion of vulvar premalignant and malignant lesions in overall vulvar specimens and to evaluate the clinicopathologic features of each vulvar lesion in King Chulalongkorn Memorial Hospital (KCMH).

Methods

Pathological microscopic slides and medical records of the patients who underwent vulvar-related operations between January 1, 2002 and December 31, 2015 were reviewed. Patients’ clinical characteristics and pathologic features were evaluated and analyzed.

Results

A total number of 700 patients were included. The proportion of malignant and premalignant lesions in overall vulvar specimens were 16.3% and 8.4%, respectively. Squamous cell carcinoma was the most common malignant vulvar lesion (48.2%), whereas vulvar intraepithelial neoplasia 1 (VIN1) (33.9%) was the most common lesion in the premalignant group. On multivariate analysis, four clinical factors were significantly associated with malignancy risk: increased parity (odds ratio [OR] 1.19, P = 0.010), large tumor size (OR 2.00, P < 0.001), lesion at clitoris (OR 16.67, P = 0.002), and erythematous lesion (OR 2.41, P = 0.026).

Conclusions

The proportion of malignant and premalignant lesions in overall vulvar specimens was 24.7% in KCMH. Increased parity, large tumor size, clitoris-located lesion, and erythematous lesion were associated with increasing malignancy risk.
Effects of the initial moment and several delays perturbations in the variation formulas for a solution of a functional differential equation with the continuous initial condition
Authors: Dvalishvili Phridon , Nachaoui Abdeljalil , Tadumadze Tamaz
Published: October 2019

For the nonlinear functional differential equation with several constant delays, the variation formulas for its solution are proved, in which the effects of perturbations of delays and the initial moment are detected.
Generalized Olsen inequality and Schrödinger type elliptic equations
Authors: Guo Yuxing
Published: October 2019

In this paper, by means of the generalized Olsen type inequality, related to the Riesz potential and its commutators, the author establishes the interior estimates on the generalized Morrey space for Schrödinger type elliptic equations with potentials satisfying the reverse Hölder condition.
An aspect of optimal regression design for LSMC
Authors: Weiß Christian , Nikolić Zoran
Published: October 2019

Practitioners sometimes suggest to use a combination of Sobol sequences and orthonormal polynomials when applying an LSMC algorithm for evaluation of option prices or in the context of risk capital calculation under the Solvency II regime.
In this paper, we give a theoretical justification why good implementations of an LSMC algorithm should indeed combine these two features in order to assure numerical stability.
Moreover, an explicit bound for the number of outer scenarios necessary to guarantee a prescribed degree of numerical stability is derived.
We embed our observations into a coherent presentation of the theoretical background of LSMC in the insurance setting.
The crystal structure of (E)-N′-(1-(3-chloro-4-fluorophenyl) ethylidene)-2-hydroxybenzohydrazide, C15H12ClFN2O2
Authors: Yan Xifeng , Zhong Shibin , Zhang Hong
Published: October 2019

C15H12ClFN2O2, monoclinic, P21/c (no. 14), a = 13.9210(13) Å, b = 13.2329(15) Å, c = 18.7191(19) Å, β = 126.250(2)°, V = 2780.9(5) Å3, Z = 8, R
gt(F) = 0.0499, wR
ref(F
2) = 0.1420, T = 293(2) K.
Crystal structure of catena-poly[{μ2-1,5-bis(diphenylphosphanyl)pentane-κ2
P:P′}dichloridocadmium(II)], C29H30CdCl2P2
Authors: Tan Yee Seng , Tiekink Edward R.T.
Published: October 2019

C29H30CdCl2P2, orthorhombic, Pna21 (no. 33), a = 15.84368(4) Å, b = 8.46281(2) Å, c = 20.88054(8) Å, V = 2799.705(14) Å3, Z = 4, R
gt(F) = 0.0275, wR
ref(F
2) = 0.0719, T = 100(2) K.
Crystal structure of catena-[(bis(O,O′-diethyl dithiophosphato-S,S′)-μ2-1,2-bis(3-pyridylmethylene)hydrazine-N,N′)zinc(II)], {C20H30N4O4P2S4Zn}n
Authors: Tan Yee Seng , Tiekink Edward R.T.
Published: October 2019

C20H30N4O4P2S4Zn, triclinic, P1̄ (no. 2), a = 8.01840(1) Å, b = 8.4326(1) Å, c = 23.5086(2) Å, α = 80.478(1)°, β = 80.679(1)°, γ = 76.112(1)°, V = 1509.37(3) Å3, Z = 2, R
gt(F) = 0.0449, wR
ref(F
2) = 0.1182, T = 100(2) K.
Well-defined nickel(II) tetrazole-saccharinate complex as homogeneous catalyst on the reduction of aldehydes: scope and reaction mechanism
Authors: Frija Luís M. T. , Rocha Bruno G. M. , Kuznetsov Maxim L. , Cabral Lília I. L. , Cristiano M. Lurdes S. , Pombeiro Armando J. L.
Published: October 2019

A new (tetrazole-saccharin)nickel complex is shown to be a valuable catalyst for the hydrosilative reduction of aldehydes under microwave radiation at low temperatures. With typical 1 mol% content of the catalyst (microwave power range of 5–15 W) most reactions are complete within 30 min. The Ni(II)-catalyzed reduction of aldehydes, with a useful scope, was established for the first time by using this catalyst, and is competitive with the most effective transition-metal catalysts known for such transformation. The catalyst reveals tolerance to different functional groups, is air and moisture stable, and is readily prepared in straightforward synthetic steps. Supported by experimental data and DFT calculations, a plausible reaction mechanism involving the new catalytic system is outlined.
O CRIMINAL COMPLIANCE COMO FERRAMENTA DE PREVENÇÃO PENAL E COMBATE ÀS ORGANIZAÇÕES CRIMINOSAS
Authors: Pessôa Ulisses , Dupret Cristiane
Published: October 2019

Esse trabalho apresenta como tema o Direito Penal Econômico e a importância do criminal compliance como ferramenta de prevenção penal e combate às organizações criminosas. Os objetivos centrais do estudo, portanto, orientam-se no sentido de demonstrar a importância do cumprimento de efetivas normas de conduta no âmbito empresarial, de forma a se desenvolver uma postura ética suficiente a evitar a prática de condutas delituosas. Trata-se de refletir acerca de critérios preventivos, de forma a se evitar a futura incidência do Direito Penal e por consequência, da aplicação da pena. Busca-se apresentar o campo de incidência do Direito Penal Econômico, dentro do qual se situa o tratamento da conduta delitiva relativa às organizações criminosas. Aborda-se o conceito e normas de fiscalização ligadas ao crime de adulteração de combustível, para em seguida demonstrar o desenvolvimento e incidência de compliance como critério de prevenção criminal.
Formation of Nanoclusters on the Adsorbed Surface under the Action of Comprehensive Pressure and Electric Field
Authors: Peleshchak R.M. , Kuzyk O.V. , Dan’kiv O.O.
Published: October 2019

In the paper, the influence of the electric field and the comprehensive pressure on the conditions of formation and the period of the surface superlattice of adatoms in semiconductors is investigated. It is established that in GaAs semiconductor, an increase in the comprehensive pressure and the electric field strength, depending on the direction, leads to an increase or decrease of the critical temperature (the critical concentration of adatoms), at which the formation of self-organized nanostructure is possible. It is shown that in strongly alloyed n-GaAs semiconductor, the increase of the electric field strength leads to a monotonous change (decrease or increase depending on the direction of the electric field) of the period of self-organized surface nanostructures of adatoms. The period of nanometer structure of the adatoms depending on the value of comprehensive pressure, temperature, average concentration of the adatoms and conduction electrons is defined. It is established that the increase in pressure leads to expansion of temperature intervals within which nanometer structures of the adatoms are formed, and the decrease of their period.
SiGe Epitaxial Films with Dislocations for the Switchable Memory: the Accurate First-Principle Calculations
Authors: Balabai R.M. , Zalevskyi D.V.
Published: October 2019

The methods of the theory of the functional of electron density and pseudopotential from the first principles btained the characteristics of an electronic subsystem of the RRAM (Resistive Random Access Memory) layer constructed on the basis of epitaxial films Si0.9Ge0.1 with dislocations and embedded in them silver atoms. The spatial distributions of the density of valence electrons and their cross sections within the cell, the distribution of the density of electronic states, and electric charges in the vicinity of the silicon atoms in different atomic environments are calculated. It is investigated how changes in the electronic subsystem of investigated objects influence the change of their properties from non-conducting to conducting ones.
Features of Electrophysical Diagnostics of Schottky Field Transistors Based on GaAs Epitaxial Layers on Silicon Substrates for Microsystem Applications
Authors: Novosiadly S.P. , Benko T.H. , Kogut I.T.
Published: October 2019

In this paper, the structure of GaAs FET on a silicon substrate, suitable for local integration in the local SOI technology and the method of its electrophysical diagnostics based on changes in the thermal resistance (RT), is analyzed. It is known that the thermal conductivity of GaAs is 3-4 times worse than silicon. To eliminate this disadvantage, the technology of forming high-speed GaAs-structures on the surface of the silicon substrate was propoused.
SURVEILLANCE OF WHITE SPOT SYNDROME VIRUS (WSSV) AND MYONECROSIS VIRUS (IMNV) INFECTIONS IN CULTURED Litopenaeus vannamei
Authors: Koesharyani Isti , Andayani Ariani , Fayumi Ulfah , Sugama Ketut
Published: October 2019

Disease surveillance programs will provide updated information on the distribution of diseases which allows proper development of mitigation and prevention strategies. WSSV and IMNV viruses are the most threatening diseases in shrimp and have affected the global shrimp farming industries. The present study was conducted to investigate the prevalence of WSSV and IMNV in three different locations of shrimp farms of South Sulawesi, West Nusa Tenggara and West Jawa. Samples of shrimp Litopenaeus vannamei were randomly collected from 20 active shrimp farms in the locations and five samples of postlarvae (PL) that were stocked in ponds. Tissue samples of the shrimp and whole body of PL were preserved in ethanol 90% for analysis. Determination of WSSV and IMNV were carried out by the mobile IQTM WSSV and IQTM IMNV Kit POCKIT Systems. The results showed that the prevalence of WSSV was 30% (6/20) and IMNV was 20% (4/20), while on PL was 40% (2/5). The result revealed that the South Sulawesi (Takalar) samples were positive only for WSSV while West Java (Panimbang) samples were positive only for IMNV. A follow-up study predicted that both viruses were transmitted from the PLs. The present study clearly confirmed that viruses were transmitted from PLs that were not free from either WSSV or IMNV. Therefore, a biosurveillance program is strongly recommended to be implemented in order to avoid the spread of the viral disease to other locations within Indonesia.
Orta Karadeniz Bölgesi illerine ait toprak sıcaklıklarının yapay sinir ağları yöntemi ile tahmin edilmesi
Authors: KARA Filiz , CEMEK Bilal
Published: October 2019

Toprakta suyun bulunuşu, hareketi,
buharlaşması ve hava kapasitesi, ayrışması olayları, mikrobiyolojik faaliyet,
kök solunumu ve vejetatif faaliyet gibi olayların tümü toprak sıcaklığının
etkisi altındadır. Bu çalışmada toprak sıcaklık değerlerinin Yapay Sinir Ağları
(YSA) yöntemi kullanılarak tahmin edilmesi amaçlanmıştır. Orta Karadeniz bölümü
illerine ait farklı toprak katmanlarındaki (5, 10, 20, 50 ve 100 cm) aylık
ortalama toprak sıcaklık değerleri ve diğer meteorolojik veriler Meteoroloji
Genel Müdürlüğünden 1971-2015 yılları için temin edilmiştir. Üç katmanlı ileri
beslemeli bir YSA yapısı oluşturularak YSA’nın öğrenmesi için
Levenberg-Marquardt (LM) algoritması uygulanmıştır. 1971-1990 yılları arası
aylık meteorolojik veriler eğitim verisi, 1991-2000 yılları arası aylık veriler
test verisi, 2001-2015 yılları arası aylık veriler validasyon verisi olarak
kullanılmıştır. İklim verileri ve toprak katmanı göz önüne alınarak 10 farklı
YSA Modeli oluşturulmuştur. Tüm istasyonlarda farklı derinliklerde elde edilen
sonuçlar için belirleme katsayısı (R²) 0.85-0.99 arasında, tahmin hatasının
standart sapması (RMSE) 0.24-3.74 arasında ve ortalama mutlak hata (MAE)
0.01-2.33 arasında değişmektedir. Çalışma sonucu YSA modellerinin Orta Karadeniz
İlleri aylık toprak sıcaklık hesaplamalarında başarılı sonuçlar verdiği
görülmüştür.
Algorithmic futures
Authors: Duclos Vincent
Published: October 2019

In the last few years, tracking systems that harvest web data to identify trends, calculate predictions, and warn about potential epidemic outbreaks have proliferated. These systems integrate crowdsourced data and digital traces, collecting information from a variety of online sources, and they promise to change the way governments, institutions, and individuals understand and respond to health concerns. This article examines some of the conceptual and practical challenges raised by the online algorithmic tracking of disease by focusing on the case of Google Flu Trends (GFT). Launched in 2008, GFT was Google’s flagship syndromic surveillance system, specializing in ‘real-time’ tracking of outbreaks of influenza. GFT mined massive amounts of data about online search behavior to extract patterns and anticipate the future of viral activity. But it did a poor job, and Google shut the system down in 2015. This paper focuses on GFT’s shortcomings, which were particularly severe during flu epidemics, when GFT struggled to make sense of the unexpected surges in the number of search queries. I suggest two reasons for GFT’s difficulties. First, it failed to keep track of the dynamics of contagion, at once biological and digital, as it affected what I call here the ‘googling crowds’. Search behavior during epidemics in part stems from a sort of viral anxiety not easily amenable to algorithmic anticipation, to the extent that the algorithm’s predictive capacity remains dependent on past data and patterns. Second, I suggest that GFT’s troubles were the result of how it collected data and performed what I call ‘epidemic reality’. GFT’s data became severed from the processes Google aimed to track, and the data took on a life of their own: a trackable life, in which there was little flu left. The story of GFT, I suggest, offers insight into contemporary tensions between the indomitable intensity of collective life and stubborn attempts at its algorithmic formalization.
Anos potenciais de vida perdidos por intoxicação exógena no Brasil no período de 2007 a 2017
Authors: Maia Sheila Silva , De Souza Verine Silva , Souza Emanuela Dias , Faustino Tassia Nery
Published: October 2019

OBJETIVO: Estimar os Anos Potenciais de Vida Perdidos (APVP) por intoxicação exógena no Brasil entre os anos de 2007 a 2017. MÉTODO: Estudo descritivo e exploratório, com dados secundários obtidos através do Sistema Nacional de Agravos de Notificação (SINAN) e do Sistema de Informação sobre Mortalidade (SIM), de 2007 a 2017, no Brasil. As variáveis investigadas foram: óbitos por intoxicação exógena, faixa etária (15-19 anos, 20-39 anos, 40-59 anos, 60-64 anos e 65-69 anos), agente tóxico, ano, sexo e região do país. RESULTADOS: Verificou- se um total de 317.687 APVP, onde a faixa etária entre 20 a 39 anos representa 56% dos óbitos, com predomínio no sexo masculino, correspondendo a 60% dos casos de morte prematura. O uso indevido de medicamentos foi responsável pelo maior número de APVP (74.131). A região sudeste apresentou maior valor de APVP que outras regiões do país. CONCLUSÃO: As intoxicações exógenas foram responsáveis por importante parcela de mortes prematuras e de APVP segundo a análise da mortalidade proporcional, sendo maior em indivíduos que fazem uso indevido de medicamentos, do sexo masculino, entre 20 e 59 anos e moradores do sudeste brasileiro.
Sıcak su kürünün silis dumanı takviyeli çimento harçlarının mekanik özelliklerine ve dayanıklılığına etkisi
Authors: İNCE Ceren
Published: October 2019

Kür sıcaklığının çimento esaslı malzemelerin taze ve sertleşmiş
özellikleri üzerinde önemli bir rol oynadığı bilinmektedir. Çimentonun erken
dönemde kür sıcaklığının artması daha hızlı hidratasyon reaksiyonunun
oluşmasına ve böylece çimento esaslı malzemelerin dayanım kazanma hızının
artmasına olanak tanımaktadır. Ancak kür sırasında çok yüksek sıcaklıkların
uygulanması, çimento esaslı malzemelerin, genellikle matris içinde oluşan
genleşmeye bağlı olarak, dayanım ve dayanıklılığını olumsuz yönde
etkilemektedir. Buna ilaveten literatürde farklı kür koşullarının özellikle de
puzolan takviyeli çimento esaslı malzemeler üzerindeki etkisinin kapsamlı bir
şekilde çalışılmadığı görülmektedir. Bu alanda yapılan literatür çalışmalarının
çeşitliliğine rağmen, puzolan takviyeli çimento esaslı malzemelerin çimento
hidratasyonunun ve puzolanik reaksiyonun sıcak su kür şartlarından ne derece
etkilendiği kapsamlı olarak incelenmemiştir. Bu nedenle makalenin başlıca amacı
silis dumanı takviyeli çimento harçlarının erken dönemde sıcak su kür şartlarında
muhafaza edilmesinin mekanik özelliklerine ve dayanıklılığına etkisini
incelemektir. Çalışmada ilk önce tane büyüklüğü
dağılımı, kimyasal bileşim ve taramalı elektron mikroskopu analizleri
gerçekleştirilerek kullanılan malzemelerin karaterizasyonu yapılmıştır. Bu
çalışma öncelikle, silis dumanı takviyeli çimento
harçlarının en uygun kür ortamının belirlenmesi için olası kür koşullarının
incelenmesi ile başlamaktadır. Ön sonuçlar, silis dumanı takviyeli çimento
harçlarının erken dönemde su içerisinde 50°C sıcaklıkta muhafaza edilmesinin en
elverişli kür ortamı olduğu yönündedir ve yapılan taramalı elektron mikroskobu
analizleri ile uyumludur. Makalede daha sonra erken dönemde sıcak su kürü
uygulanan numunelerin artan silis dumanı ikame seviyesinin mekanik
özelliklerine etkisi çalışılmıştır. Erken dönemde uygulanan sıcak ve soğuk su
kür şartlarının bu harçlar üzerindeki mekanik özellikleri de
karşılaştırılmıştır. Sıcak su altında kürlenmiş silis dumanı takviyeli çimento
harçlarının içyapı değişimlerini daha iyi anlayabilmek için taramalı elektron
mikroskobu analizleri gerçekleştirilmiştir. Erken dönemde sıcak su kürü
uygulanan numunelerde artan silis dumanı ikame seviyesinin porozite ve su
işleme derinliği üzerindeki etkileri de incelenmiştir. Çalışmada ayrıca sıcak
su kürü uygulamasının silis dumanı takviyeli çimento harçlarının dayanıklılığı
üzerindeki etkisini incelemek için donma ve çözünme direnci ve karbonatlaşma
derinliği de ölçülmüştür. Sonuçlar, silis dumanı takviyeli çimento harçlarının
erken dönemde sıcak su kür şartlarında muhafaza edilmesinin, mekanik
özelliklerin ve dayanıklılığın kazanımında önemli bir rol oynadığına işaret
etmektedir. Makalede raporlanan sonuçlar, puzolan takviyeli çimento esaslı
malzemelerin uygun kür ortamlarının belirlenmesinde önemli katkı sağlamaktadır.
Kumanda yükleme sistemlerinin geliştirilmesine yönelik bir mühendislik uçuş simülatörü
Authors: Taşcıoğlu Yiğit , Aygün Mehmet Murat
Published: October 2019

Gelişmiş uçuş
simülatörlerinin alt sistemlerinden biri olan Kumanda Yükleme Sistemi (KYS),
uçuş sırasında oluşam kumanda kuvvetlerini simülasyon ortamında yapay olarak
üreterek simülasyonun gerçekçiliğini arttırır. Bu çalışmada KYS geliştirmek amacıyla bir mühendislik uçuş simülatörü
hayata geçirilmiş, uçuş
dinamiği modeli, görüntüleme sistemi ve KYS entegre edilerek pilotlu doğrulama testlerinin
de yapılabilmesine imkan sağlanmıştır. KYS’nin donanımsal tasarımında kolay uyarlanabilme özelliği ön planda
tutularak, yüksek torklu elektrik motorlarıyla tahrik edilen eklemli yapıda bir
tasarıma gidilmiştir. Simüle edilecek hava aracının kumandalarından ölçülen verilerin
girdi olarak kullanılabilmesi için bir prosedür önerilmiştir. Geliştirilen KYS’nin
başarımı, simulator kumandalarından ölçülen davranışın hava aracından
ölçülenlerle karşılaştırılmasıyla, uluslararası standart sertifikasyon
dokümanlarındaki isterler
doğrultusunda incelenmiştir.
Kabuk yalıtımının bina ısıtma enerjisi ihtiyacına, maliyetine ve karbon ayak izine etkisinin yaşam döngüsü bakış açısıyla değerlendirmesi
Authors: Altun Murat , Meral Akgül Çağla , Akçamete Aslı
Published: October 2019

Türkiye’de hacimsel ısıtma, binalarda
enerji tüketiminin ana kalemidir. Özellikle erken tasarım süreçlerinde
yapılacak etkin kabuk yalıtımı, binanın yıllık ısıtma enerjisi ihtiyacını ciddi
oranda azaltan en yaygın pasif çözümdür. Bu çalışma, tüm Türkiye için binalarda
erken tasarım aşamasında
yapılacak ek kabuk yalıtımı yatırımlarının etkinliğini
değerlendirmeyi amaçlar. Çalışma, TS 825 “ Binalarda ısı yalıtım kuralları”
standardının yürürlükteki (2008) ve taslak
halindeki (2013) versiyonlarını esas alır. Çalışmada, yalıtımsız bir binanın TS
825’e göre yalıtılmasının etkinliği kısa dönem (yıllık ısıtma enerji
ihtiyacında sağlanan tasarruf, ek yalıtım maliyeti ve ek sera gazı salımı) ve
yaşam döngüsü (yaşam döngüsü maliyeti ve sera gazı salımı) olmak üzere iki
farklı süreçte incelenmiştir. Ayrıca yapılan ek yatırımın, maliyet ve sera gazı
açısından geri ödeme süreleri de analiz edilmiştir. Analizler, standarda göre
yapılan yalıtımların yıllık ısıtma enerjisi ihtiyacında %75’lere, yaşam döngüsü maliyetinde %70’lere, yaşam döngüsü sera gazı
salımında ise %73’lere varan iyileştirmeler sağladığını göstermiştir. Maliyet
geri ödeme süreleri 7 yılın, sera gazı geri ödeme süreleri ise 2 yılın altında
hesaplanmıştır.
Doğal gürültü tomografisinden İzmir İç Körfezi’nin 3-B üst kabuk hız yapısı
Authors: MULUMULU Emre , ÖZER Çağlar , GÖK Elçin , CHAVEZ-GARCİA Francisco J. , POLAT Orhan
Published: October 2019

Bu çalışmada doğal gürültü tomografisi yöntemi
kullanılarak İzmir İç Körfezi 3-B üst kabuk hız yapısının ortaya konması
hedeflenmiştir. Çalışmada İzmirNET’e bağlı 17 istasyondan elde edilen 1 yıl
uzunluğunda doğal gürültü verileri kullanılmıştır. Yeterli sinyal/gürültü
oranına sahip verilerden yola çıkılarak çoklu süzgeç tekniği yardımıyla
dispersiyon eğrilerinden Rayleigh dalgası grup hızları elde edilmiştir.
Sonuçlar farklı periyot aralıkları için haritalanmıştır. Daha sonra 2, 4 ve 6
saniyelik periyotlara ait lokal dispersiyon eğrileri çıkartılarak ters çözüm
yardımıyla grup hızından kayma dalgası hızları elde edilmiştir. Körfez içi ve
yakın çevresinde bulunan çökel birimlere bağlı düşük hızlı alanlar, grup hızı
ve kayma dalgası hızı haritalarında 3 km derinliğe kadar net bir şekilde
gözlenmiştir. Bununla birlikte düşey yönlü derinlik kesitlerinde körfezin iç
kısmında sadece düşük değil yüksek hızlı alanların da varlığı saptanmıştır. Yöntem,
doğal gürültü tomografisi tekniği kullanılarak depremlere ihtiyaç duymadan
kabuk ve üst manto hakkında hassas ve yüksek çözünürlüklü görüntü sağlayabilir.
İleride geniş-bant veri seti kullanılarak Ege Bölgesine, Türkiye’ye veya yakın
coğrafyamızda yer alan bir bölgeye uygulanabilir.
Karbon fiber takviyeli kompozit (KFTK) malzemelerin frezelenmesinde delaminasyon ve kesme kuvvetlerinin değerlendirilmesi ve matematiksel modellenmesi
Authors: YAĞMUR Selçuk , KURT Abdullah , ŞEKER Ulvi
Published: October 2019

Günümüzde kompozit malzemelerin, çeliğin
yerini almasıyla %60-80 oranında ve alüminyumun yerini almasıyla ise %20-50
oranında ağırlıktan kazanım mümkün hale gelmiştir. Kompozit malzemeler birçok
mühendislik uygulamaları için tercih edilen malzemeler haline gelmişlerdir.
Fakat kompozit malzemelerin bu avantajlarının yanı sıra işlenmesinde yaşanan
sıkıntılar söz konusudur. Farklı sektörlerde güncel teknolojinin vazgeçilmez malzemelerinden
biri olarak görülen fiber takviyeli kompozit malzemelerin işlenmesi diğer
malzemelere oranla daha zordur. Bu durum kesici takımlar açısından çok seçici
olmayı gerektirir. Bu çalışmada, Karbon Fiber Takviyeli Kompozit (KFTK)
malzemelerin işlenmesinde yaşanan güçlükleri ve özellikle de katmanlı/laminer
yapıdaki levhalarda katman kalkması (delaminasyon) problemini bertaraf
edebilecek özgün PCD kesici takım tasarımı yapılmıştır. Bu takımlar ile Karbon
Fiber Takviyeli Kompozit malzemelerin frezelenmesinde meydana gelen
delaminasyon ve kesme kuvvetleri araştırılmıştır. Kesme parametreleri olarak
350, 400 ve 450m/min kesme hız ve 1270 mm/min sabit ilerleme miktarı
seçilmiştir. Deneyler sonucunda en iyi performansı tasarımı ve üretimi
gerçekleştirilen ve 1 numara ile kodlanan kesici takımın gösterdiği
görülmüştür. Artan kesme hızının hasarı ve kesme kuvvetlerini olumlu yönde
etkilediği görülmüştür. Ayrıca regresyon analizi sonrasında elde edilen ANOVA
istatistiklerine göre hasar ve kesme kuvvetleri açısından etkili olan
parametreler tespit edilmiştir.
Metanın oksidatif birleşme reaksiyonu için Mn/Na2WO4/SiO2 katalizörü üzerinde reaksiyon parametrelerinin etkisinin incelenmesi
Authors: ÖZDEMİR Hasan , ÖKSÜZÖMER M.a. Faruk , GÜRKAYNAK Mehmet Ali
Published: October 2019

Metanın
oksidatif birleşme reaksiyonu için 2Mn/5Na2WO4/SiO2
katalizörü üzerinde reaksiyon parametrelerinin etkisi incelenmiş ve katalitik
olmayan reaksiyon sonuçları ile karşılaştırma yapılmıştır. Oksidant tipinin (O2
ve N2O), CH4/O (1/1-4/1) oranının, boşluk hızının
(7500-37500 L kg-1 h-1) ve sıcaklığın (740-820°C) etkileri
bir seferde tek değişken yöntemi ile değerlendirilmiştir. Aktivite testleri,
yüksek C2 verimlerinin seçilen parametre aralıklarında oksidant tipi
(O2 veya N2O) ve reaksiyon ortamından (katalitik veya
katalitik olmayan) bağımsız olarak düşük CH4/O oranları ve boşluk
hızlarında elde edilebileceğini göstermiştir. Sıcaklıktaki sürekli artış, C2
verimini arttırmış ve bu artış özellikle N2O kullanılarak
katalizörsüz gerçekleştirilen reaksiyonlar esnasında daha belirgin olmuştur. En
yüksek C2 verimi katalizör ile CH4/O=1, 7500 L kg-1
h-1 ve 780°C’de O2 kullanarak %16,4’tür. Katalizör
kullanılmadan elde edilen maksimum C2 verimi, CH4/O=1,
7500 L kg-1 h-1 ve 820°C’de N2O kullanılarak
%10,1 olarak bulunmuştur. N2O kullanımı durumunda O2’ye
kıyasla her şartta daha yüksek C2 seçimliliği elde edilebildiği
gözlemlenmiştir. Katalizörün O2 dissosiyasyonuna karşı aktivitesi
iyi, N2O dekompozisyonuna karşı zayıf olmuştur. Katalizörün 8 saat
süresince deaktivasyona uğramadığı gözlemlenmiştir.
Inoculating a Liquid Bacterial Culture v1
Authors: Moore Saul , Barlow Ida
Published: October 2019

Luria broth (LB) is a nutrient-rich media commonly used to culture bacteria in the lab. LB agar plates are frequently used to isolate individual (clonal) colonies of bacteria carrying a specific plasmid. However, a liquid culture is capable of supporting a higher density of bacteria and is used to grow up sufficient numbers of bacteria necessary to isolate enough plasmid DNA for experimental use. The following protocol is for inoculating an overnight culture of liquid LB with bacteria. This is a general protocol for making a liquid bacterial culture and the following parameters need to be mentioned for a specific type of bacterial strain: 1. Name of the bacterial strain 2. Growth temperature 3. Incubation time 4. Antibiotic resistance (if any) 5. Rpm of the shaking incubator
Using Activity Theory to Explain How a Student Learns ‎in an Internationalised Classroom ‎from a Sociocultural ‎Perspective
Authors: Albusaidi Saud
Published: October 2019

This paper focuses on mediation, which is one of the concepts developed by Vygotsky under the umbrella of sociocultural theory. It also draws on activity theory as a theoretical framework to understand the learning experiences undertaken by an international student engaged in a 12-month programme in the UK for one year. This study adopted a qualitative approach; which involved conducting a semi-structured interview with the participant to provide an in-depth understanding of how tools and artefacts in culture and in wider society mediated the process of learning and development. Activity theory helped elucidate how this process was facilitated by socialising with others and through mediational tools. This paper identified three areas where dynamic and complex social activities took place: speaking English, attending class on time, and critical thinking.
Developing Instructional Design Model of Speaking Skill for First Year Undergraduate Students
Authors: Harpain Harpain , Sidabalok Dameria Magdalena , Cahyani Margaretha Audrey Stefani , Yulfriwini Yulfriwini
Published: October 2019

This study was conducted to search for Contextual Teaching and Learning model suitable for developing English speaking skill for first-year students of undergraduate study of Teacher Training and Education Faculty of Universitas Bandar Lampung. In teaching speaking, especially for Second Language and Foreign Language Learners, it was assumed that learning speaking by using tailored instructional design model could accelerate student speaking development. The result of this study should construct a model which is suitable for developing English speaking skill in the first year of undergraduate study.
The Production-oriented Approach to Teaching English Writing in Chinese Junior High Schools
Authors: Liu Guobing , Zhang Yafei
Published: October 2019

With the acceleration of globalization, English communicative competence has become a necessary ability in modern society. The teaching of English writing in junior high schools not only improves students’ comprehensive language ability, but also lays a favorable foundation for their future English learning. Writing classes should highlight the importance of writing. But in fact, students’ actual output is neglected. The writing classes exist in name only. Based on the above questions, this research attempts to apply the Production-Oriented Approach (POA) in junior high school English writing teaching which is proposed by Chinese scholar Wen Qiufang. This research aims to find the effectiveness of POA in English writing teaching of Chinese junior high schools. We adopt the experimental research approaches, using classroom observation, interviews and tests to collect research data. Taking a class of 50 students in Grade 8 of junior high school as the research subjects, the researcher carries out the production-oriented English teaching experiment for one semester. It has been found: (1) Compared with traditional English instructions, POA can improve the English writing quality and comprehensive language using ability of junior high school students. (2) Both teachers and students believe that POA can stimulate students’ positive emotional experience, and students have more opportunities to use language in class. Through “enabling”, the quality of students’ language output has been significantly improved.
Enseñando la economía política neoliberal en Chile: notas sobre el programa de estudio de Consumo y Calidad de Vida de Educación de Adultos
Authors: Kornbluth David L.
Published: October 2019

El presente texto es el resultado de un análisis de contenido de un programa educativo de educación de adultos en Chile. La materia analizada lleva por título Consumo y Calidad de Vida, y se inserta en una sección obligatoria de la educación formal de adultos denominada Formación Instrumental, y cuyo programa fue promulgado en el año 2007 por el Ministerio de Educación del Estado de Chile y se encuentra vigente en la actualidad sin mayor actualización una década después.El análisis se centra en la producción y reproducción de sentidos que se encuentran presentes en las distintas unidades, y se hacen evidentes en los objetivos, los contenidos y los aprendizajes esperados, a la vez que en la estructura y el aparataje conceptual desplegado.El análisis de contenido de los distintos componentes del currículum hace evidente la representación y el aprendizaje de un determinado modo de vida como el modo correcto, naturalizando elementos neoliberales y acordes a fortalecer las dinámicas del capitalismo financiero chileno
Resistance and Knowledge Production: Social Movements as Producers of Theory and Praxis
Authors: Schroering Caitlin
Published: October 2019

Drawing on fieldwork with Brazil’s Movimento dos Atingidos por Barragens (MAB), the author argues that MAB’s struggle is not just around those affected by dam projects; rather it is a part of a larger “alter-globalization” project. The author posits that MAB is not simply a social movement actor but a producer of knowledge that articulates theory and praxis resisting the larger hegemonic imperialist system. In this paper the following questions are explored: What can academia learn from social movements? How do scholars produce research that does not reinforce power hierarchies? And how do we create collaborative research?
Topical platelets rich plasma implications in management of burn
Authors: El Ghazaly Mohammed A. , Abo Grida Hisham S. , El Sheikh Yasser M. , Aly Medhat S.
Published: October 2019

Background: Burn injury is a major cause of trauma to the human body, causing death and disability with a long healing period and high health care costs. The mortality rate of burn injury is decreasing with new treatment modalities.Methods: Fifty patients who underwent to use or not use the platelet rich plasma (PRP) technique in improving the process of healing in burn scars and graft either by physiological dressing or sub dermal injection between 2 groups. The study was conducted on patients presented to Plastic and Reconstructive Surgery Department of Abou Qir General Hospital and Menuofia University in the period from October 2017 to October 2018.Results: On treating the burned area with PRP injection and conventional dressing, the minimal time taken for complete healing was 10 days, while the maximal time taken was 24 days with median 18 days while on treating the burned area with conventional dressing without PRP injection, the minimal time taken for complete healing was 14 days, while the maximum time taken was 32 days.Conclusions: With application of PRP decreased the need of grafting through promoting the healing process of the wound of burned areas than areas not applied with PRP.
Assessment between hypoparathyroidism and the number of parathyroid glands preserved during thyroidectomy: a record based study
Authors: Bellapu Srujan Kumar
Published: October 2019

Background: Hypoparathyroidism is a major complication of thyroidectomy. The association between the number of parathyroid glands preserved and hypoparathyroidism is not well understood. The objectives of the study were to evaluate the clinical characteristics and the frequency of hypoparathyroidism during thyroidectomy, and to determine the minimum number of parathyroid glands that need to be preserved to prevent hypoparathyroidism.Methods: A retrospective study was conducted in Department of Surgery in Tertiary care hospital from January 2016 to December 2017. Around 250 patients who underwent total thyroidectomy for papillary thyroid carcinoma were analysed. We evaluated the frequency of hypoparathyroidism according to the number of parathyroid glands preserved.Results: Incidental parathyroidectomy occurred in 20% of the patients; one parathyroid gland in 16%, two in 1.5%, and three in 0.9%. Transient hypoparathyroidism was increased when incidental parathyroidectomy occurred (odds ratio 1.63, 95% confidence interval 1.07 to 3.13, p=0.03). There was no significant relationship between the number of parathyroid glands preserved and permanent hypoparathyroidism (p=0.16).Conclusions: Conservation of all parathyroid glands decreases transient hypoparathyroidism equated with when three or fewer glands are preserved but does not affect permanent hypoparathyroidism.
Prospective study on standard and totally tubeless percutaneous nephrolithotomy
Authors: Reddy V. Vishnu Vardhana , Repaka Amar Kumar
Published: October 2019

Background: With the improvement of instrumentation and experience of percutaneous nephrolithotomy (PCNL), several modifications to the procedure have taken place in order to reduce the morbidity and early return to normal lifestyle. This study aimed to compare the totally tubeless percutaneous nephrolithotomy and standard percutaneous nephrolithotomy techniques.Methods: It is a prospective randomized, clinical trial done on 60 patients was patients older than 20 years and younger than 60 years who were chosen for elective surgery of kidney stones via the PCNL technique. Patients were divided into two groups, standard PCNL (with a nephrostomy tube) and totally tubeless PCNL (no ureter stents or ureteric catheters).Results: Demographic data is matched in two groups of patients. The mean operation time was slightly longer in the standard group (108 minutes) than in the totally tubeless group (102 minutes), but there was no statistically significant difference. There was no significant difference between the two groups with regard to serum creatinine change or blood loss. Haemoglobin drop, hospital stay, Pain score and analgesia requirement was significantly less in the totally tubeless group. 4 patients in each group had bleeding postoperatively. Only five patients developed pyrexia in the postoperative period. The differences in the need for blood transfusion and postoperative pyrexia were not found to be statistically significant. 19 in standard group and 2 patients in totally tubeless group developed urine leak, found to be statistically significant.Conclusions: Author can conclude that the tubeless procedure has fewer complications, improved postoperative patient comfort, shorter hospitalization, and a reduced need for analgesics.