bluuebunny/crossref_metadata_2025 huggingface dataset:
MODELING AND THEORETICAL RESEARCH OF THERMOELECTRIC SYSTEM FOR INTRACOLAR HYPOTHERMIA
Authors: Evdulov O. V. , Magomadov R. A. , Magomedova S. G. , Nabiyev N. A.
Published: June 2019

Objectives The purpose of the article is to simulate and theoretical study of the thermoelectric system (TPP) for intracavitary hypothermia, the study of the processes occurring in it taking into account the influence of the parameters of the object of influence and characteristics of a thermoelectric battery (TEB). Method A physical model of thermal power plants for intracavitary hypothermia, consisting of two thermopiles, interconnected through an all-metal thermal bridge, equipped with an acting tip and a liquid heat exchanger is proposed. A quasi-stationary mathematical model of thermal power plants has been developed as a set of interconnected heat exchange systems, thermopile and heat conductor characterized by heat capacity, thermal conductivity and thermal resistance, which allows us to estimate the duration of the device output to the operating mode, taking into account the thermal properties of the biological object. Result The dependences of the temperature change of different parts of TPPs in time are obtained for the case of operation of the device in idling mode and in the presence of heat load. The temporal variation of the temperature of the object of influence, the conductor, the heat pipe and the heat exchanger at different currents of supply of thermopile and also for different values of the temperature of the liquid in the heat exchanger is considered. Conclusion It is established that without load, the temperature of the acting tip stabilizes in approximately 4–4.5 minutes. At the same time, an increase in the current strength of an additional thermopile from 5 to 15 A at the current supply of the main thermopile 50 A reduces the operating value of T from 235 K to 220 K. During the procedures, the required level of laryngeal tissue temperature decrease (273 K) can be achieved at the main power supply current and additional thermopile, respectively, equal to 25 and 10 A after 2 min. At a fixed temperature of the reference junctions of the main thermopile, the limiting decrease in the temperature of the acting tip is limited by the magnitude of the optimal thermopile current. It is possible to obtain deeper cooling at a given value of the supply current by reducing the temperature of the reference junctions of the main thermopile.
STUDY OF THE EFFECT OF COMPLEX-COMPOSITE STRUCTURES ON THE THERMAL CHARACTERISTICS OF THE POLYMER ADDITIVE MATERIALS
Authors: Bekrenev N. V. , Makarova V. M. , Pavlov S. P.
Published: June 2019

Objectives The use of additive technologies is one of the promising areas for improving the production of products for various purposes in the transition to a digital economy. Method. Layered construction of objects of complex shape in accordance with the developed solid-state model from materials with different mechanical and thermal properties allows directionally controlling the distribution of various components in the volume of the composite material and forming topological structures that provide a rational balance between various performance characteristics and reliability of the product. Result. Based on experimental studies, it has been established that reinforcing topological reinforcement of 3D printing objects made from ABS plastic with a composite consisting of carbon fibers and ED-20 epoxy resin, along with an increase in flexural strength and tensile strength, contributes to an increase in thermal conductivity of the material by more than 18% and thermal diffusivity - by 20%. A computer simulation of elementary cells of a composite material consisting of a polymer matrix, carbon fiber and special core inclusions with high thermal conductivity was performed, which made it possible to further increase thermal conductivity depending on the relative fiber diameter and the percentage of the additional component in an amount from 46 to 75%. Conclusion It is shown that additive technologies are an effective tool for creating universal topologies that allow technologically managing a combination of both mechanical and thermophysical properties of structural materials by determining the rational relative position of their components depending on the purpose and level of achievement of the required characteristics.
Web-Based Benefit-Finding Writing for Adults with Type 1 or Type 2 Diabetes: Preliminary Randomized Controlled Trial (Preprint)
Authors: Crawford Joanna , Wilhelm Kay , Proudfoot Judy
Published: June 2019

BACKGROUND

The high prevalence of diabetes distress and subclinical depression in adults with type 1 and type 2 diabetes mellitus (T1DM and T2DM, respectively) indicates the need for low-intensity self-help interventions that can be used in a stepped care approach to address some of their psychological needs. However, people with diabetes can be reluctant to engage in mental health care. Benefit-finding writing (BFW) is a brief intervention that involves writing about any positive thoughts and feelings concerning a stressful experience such as an illness, avoiding potential mental health stigma. It has been associated with increases in positive affect and positive growth and has demonstrated promising results in trials in other clinical populations. However, BFW has not been examined in people with diabetes.

OBJECTIVE

This study aimed to evaluate the efficacy of a Web-based BFW intervention for reducing diabetes distress and increasing benefit finding in diabetic adults with T1DM or T2DM compared to a control writing condition.

METHODS

Adults with T1DM or T2DM and diabetes distress were recruited online through the open access Writing for Health program. After completing baseline questionnaires, they were randomly allocated to receive online BFW or an active control condition of online writing about the use of time (CW). Both groups completed 15-minute online writing sessions, once per day, for 3 consecutive days. Online measures were administered at baseline, 1 month, and 3 months postintervention. Participants were also asked to rate their current mood immediately prior to and following each writing session.

RESULTS

Seventy-two adults with T1DM or T2DM were recruited and randomly allocated to receive BFW (n=24) or CW (n=48). Participants adhered to the BFW regimen. Greater increases in positive affect immediately postwriting were found in the BFW group than in the CW group. However, there were no significant group-by-time interactions (indicating intervention effects) for benefit finding or diabetes distress at either the 1-month or 3-month follow-up. Both the BFW and CW groups demonstrated small, significant decreases in diabetes distress over time.

CONCLUSIONS

BFW was well tolerated by adults with diabetes in this study but did not demonstrate efficacy in improving diabetes distress or benefit finding compared to an active control writing condition. However, due to recruitment difficulties, the study was underpowered and the sample was skewed to individuals with minimal diabetes distress and none to minimal depression and anxiety at baseline. Future research should continue to investigate the efficacy of variants of therapeutic writing for adults with T1DM or T2DM, using larger samples of participants with elevated diabetes distress.

CLINICALTRIAL

Australiand New Zealand Clinical Trials Registry ACTRN12615000241538; https://www.anzctr.org.au/Trial/Registration/TrialReview.aspx?id=368146
Prevalence and Outcomes of Web-Based Health Information Seeking for Acute Symptoms: Cross-Sectional Study (Preprint)
Authors: Aoun Lydia , Lakkis Najla , Antoun Jumana
Published: June 2019

BACKGROUND

The literature indicates that Web-based health information seeking is mostly used for seeking information on well-established diseases. However, only a few studies report health information seeking in the absence of a doctor’s visit and in the context of acute symptoms.

OBJECTIVE

This survey aimed to estimate the prevalence of Web-based health information seeking for acute symptoms and the impact of such information on symptom management and health service utilization.

METHODS

This was a cross-sectional study of a convenience sample of 287 Lebanese adults (with a response rate of 18.5% [54/291]) conducted between December 2016 and June 2017. The survey was answered by participants online or through phone-based interviews.

RESULTS

A total of 64.3% of the participants (178/277) reported checking the internet for health information when they had an acute symptom. The rate of those who sought to use Web-based health information first when experiencing acute symptom(s) in the past 12 months was 19.2% (25/130). In addition, 50% (9/18) visited the doctor because of the obtained information, and the rest self-medicated or sought a pharmacist’s advice; the majority (18/24, 75%) improved within 3-4 days.

CONCLUSIONS

Higher education level and trust in Web-based medical information were two major predictors of Web-based health information seeking for acute symptoms. Seeking Web-based health information first for acute symptoms is common and may lead to self-management by avoiding a visit to the physician. Physicians should encourage their patients to discuss Web-based health information and guide them toward trusted online websites.
Efficacy and Safety of Esaxerenone (CS-3150) for the Treatment of Type 2 Diabetes with Microalbuminuria
Authors: Ito Sadayoshi , Shikata Kenichi , Nangaku Masaomi , Okuda Yasuyuki , Sawanobori Tomoko
Published: June 2019

Background and objectives

The progression of kidney disease in some patients with type 2 diabetes mellitus may not be adequately suppressed by renin-angiotensin system inhibitors. Esaxerenone (CS-3150) is a nonsteroidal mineralocorticoid receptor blocker that has shown kidney protective effects in preclinical studies, and it is a potential add-on therapy to treat diabetic kidney disease. This phase 2 study evaluated the efficacy and safety of esaxerenone in Japanese patients with type 2 diabetes mellitus and microalbuminuria.

Design, setting, participants, & measurements

This multicenter, randomized, double-blind, placebo-controlled trial enrolled 365 hypertensive or normotensive patients with type 2 diabetes mellitus and microalbuminuria (urinary albumin-to-creatinine ratio ≥45 to <300 mg/g creatinine) treated with renin-angiotensin system inhibitor who had eGFR≥30 ml/min per 1.73 m2. Participants were randomized to receive 0.625, 1.25, 2.5, or 5 mg/d esaxerenone or placebo for 12 weeks. The primary end point was the change in urinary albumin-to-creatinine ratio from baseline to week 12 (with last observation carried forward).

Results

Esaxerenone treatment at 1.25, 2.5, and 5 mg/d significantly reduced urinary albumin-to-creatinine ratio by the end of treatment (38%, 50%, and 56%, respectively) compared with placebo (7%; all P<0.001). The urinary albumin-to-creatinine ratio remission rate (defined as urinary albumin-to-creatinine ratio <30 mg/g creatinine at the end of treatment and ≥30% decrease from baseline) was 21% in the 2.5- and 5-mg/d groups versus 3% for placebo (both P<0.05). Adverse events occurred slightly more frequently with esaxerenone versus placebo, but the frequencies of drug-related adverse events and discontinuation rates were similar in the placebo and the 0.625-, 1.25-, and 2.5-mg/d groups. Drug-related adverse events and treatment discontinuations were marginally higher in the 5-mg/d group. The most common drug-related adverse event was hyperkalemia, which was dose proportional.

Conclusions

Adding esaxerenone at 1.25, 2.5, and 5 mg/d for 12 weeks to an ongoing renin-angiotensin system inhibitor significantly reduces urinary albumin-to-creatinine ratio in patients with type 2 diabetes mellitus and microalbuminuria.
Glycolysis and pH Decline Terminate Prematurely in Oxidative Muscles despite the Presence of Excess Glycogen
Authors: Chauhan Surinder S. , LeMaster Michelle N. , Clark Daniel L. , Foster Morgan K. , Miller Caroline E. , England Eric M.
Published: June 2019

Meat from oxidative skeletal muscle has a higher postmortem ultimate pH, which was originally thought to be a result from decreased antemortem glycogen stores. Therefore, we hypothesized that excess glycogen may not resolve the high ultimate pH of meat from oxidative muscles in ruminants and poultry. To test this hypothesis, an in vitro muscle glycolytic buffer system containing excess glycogen was used to compare glycolysis and pH decline of glycolytic and oxidative muscle from beef, lamb, chicken, and turkey. Glycogen concentration of both glycolytic and oxidative muscle homogenates was similar at 0 min and decreased significantly with time in all species tested. All homogenates contained residual glycogen at 1440 min, indicating glycogen was provided in excess. The ultimate pH of the oxidative muscle homogenates was significantly increased compared to the glycolytic muscle. The oxidative muscle also contained decreased lactate and decreased glucose 6-phosphate in all the species tested at 1440 min. Combined these data suggest that glycolysis and pH decline of oxidative muscles terminate prematurely at higher ultimate pH even in the presence of excess glycogen across livestock species. Additionally, the data indicated that the in vitro glycolytic buffer system can be used to study species specific meat quality problems in beef, lamb, chicken, and turkey.
PRODUCTIVITY AND EFFECTIVE DEMAND: ASSESSING THE DISAGGREGATE PUBLIC SPENDING
Authors: Zavaleta Josué , Cruz Moritz
Published: June 2019

In this paper, we attempt to support the argument regarding the endogeneity of productivity to effective demand. Unlike most of the works on the topic, we focus on the role that both public investment and public consumption have on productivity. We suggest, at the theoretical level, that public investment has unambiguously positive effects on productivity, whereas the effect of public consumption is ambiguous, being not necessarily large or positive. Our econometric results, using data of selected Latin American economies, support the previous argument. The policy recommendation that follows from these results is that an expansionary fiscal policy based on public investment can indeed enhance the productivity evolution and consequently economic growth and development. 

 

PRODUCTIVIDAD Y DEMANDA EFECTIVA: EVALUANDO EL CASO DEL GASTO PÚBLICO DESAGREGADO

RESUMEN
En este trabajo nos proponemos sustentar el argumento referente a la endogenidad de la productividad respecto a la demanda agregada. A diferencia de la mayoría de los trabajos en el tema, nos enfocamos en el papel que el gasto público tanto en consumo como en inversión tiene sobre la productividad. Sugerimos, a nivel teórico, que el gasto público en inversión tiene sin lugar a dudas efectos positivos en la productividad, mientras que el gasto público en consumo tiene efectos ambiguos, siendo no necesariamente grandes o positivos. Nuestros resultados econométricos, usando datos de una muestra selecta de economías de América Latina, validan el argumento previo. La recomendación de política que sigue a estos resultados es que para incrementar la productividad, así como el crecimiento y el desarrollo económicos, la política fiscal expansiva debe estar basada principalmente en gasto en inversión.
Stress analysis in a screw conveyor axis under a specific fault condition
Authors: Figueroa Díaz Rafael Alfonso , Balvantín García Antonio de Jesús , Diosdado de la Peña José Ángel , Cruz Alcantar Pedro , Murillo Verduzco Ismael , Pérez Olivas Pedro Alberto
Published: June 2019

This work presents an analytical and numerical methodology that allows determining stress distribution during the functioning of a screw conveyor utilized for conveying granular material. Different operating conditions were studied analytically and numerically. Initially, the reactions generated when the mechanism was fully braced with four supports along the longitudinal axis of the shaft were estimated. In addition, the system was analyzed with a typical fault in one of the central supports. The faults studied occur primarily due to the empirical modifications that companies make to these kinds of mechanisms and to the continuous operation of the conveyor system. Finally, a comparative analysis is presented between the analytical and the numerical results in order to validate the proposed methodology.
Parámetros concentrados locales de un tubo Venturi Cavitante
Authors: Cruz Vanegas Samuel
Published: June 2019

La dinámica del fenómeno de la cavitación es una función principalmente de los números de cavitación, Mach and Reynolds, así como de la fracción volumétrica de gas más vapor disuelta en el líquido y de los factores geométricos del dispositivo cavitante. Actualmente, se usan algunos dispositivos de gran tamaño y complejidad para monitorear, de forma no invasiva, algunas de las variables previamente mencionadas. Sin embargo, son aparatosos, costosos y en algunos casos peligrosos, como la tomografía eléctrica y de rayos X. Una alternativa es el monitoreo de las emisiones acústicas generadas por el fenómeno de la cavitación junto con modelos teóricos simplificados, como los parámetros concentrados, para determinar en forma simple e inmediata algunas de las variables mencionadas. Debido a lo anterior, en este trabajo se estudia a la cavitación en un tubo Venturi como un sistema de segundo orden capaz de generar y amortiguar frecuencias acústicas; usando las ecuaciones de Navier-Stokes para flujos estacionarios bifásico, homogéneos, unidimensionales y barotrópicos. En consecuencia, el coeficiente de frecuencia determinado es una función de las variables mencionadas. Para corroborar el modelo teórico, se implementa un sistema hidrodinámico con válvulas, una bomba y un tubo Venturi. La acústica, así como temperatura y la dinámica del flujo se monitorean usando sensores piezoeléctricos, un termómetro, una cámara de alta velocidad y un manómetro diferencial. De acuerdo con los resultados, la frecuencia es un indicador de los cambios en la fracción volumétrica de gas más vapor disuelto en el líquido y del comportamiento del tubo Venturi como medidor o controlador de caudal. Además, las variables que permiten a los flujos cavitantes propagar ondas de presión son el número de Mach y cavitación. Aunque el presente modelo teórico es consistente con las observaciones experimentales, debe ser modificado para incluir la generación de ondas de presión.
El Open Access a debate: entre el pago por publicar y la apertura radical sostenible
Authors: Araiza  Díaz Verónica , Ramírez Godoy María Esther , Díaz Escoto Alma Silvia
Published: June 2019

Se muestra la evolución del movimiento de acceso abierto, en contraste con la resistencia de empresas editoriales que desean seguir controlando la distribución de la información científica a través del pago por publicar. Se presenta a los actores y el escenario donde se da esta disputa, con base en los antecedentes de la comunicación científica y de las diferentes etapas del proceso de acceso a las publicaciones especializadas. Se discute la relevancia y viabilidad del movimiento Open Access (AO), y se proporcionan algunas claves para su posible sustentabilidad. Se destaca la necesidad de replantear la dictaminación por pares de los artículos, a fin de alcanzar una revisión abierta (Open Review, OR), en un contexto generalizado de cultura libre. Se concluye que se trata de un fenómeno de carácter económico, social, político y epistémico, además de que la esencia del Open Access demanda un modelo de circulación libre, abierta y gratuita del conocimiento científico, en un contexto de prácticas colaborativas entre autores, editores, revisores y bibliotecarios, en el entendido de que el conocimiento es un bien común y que, por ello, es necesario definir nuevos patrones de producción, evaluación, distribución, consumo y propiedad del conocimiento.
Pengaruh Corporate Governance terhadap Profitabilitas Bank Umum Syariah (BUS) Indonesia Periode 2011-2016
Authors: Ariandhini Jielend
Published: June 2019

This study aims to determine the effect of Corporate Governance (CG) as measured by the composition of the board of commissioners, the composition of the board of directors, the composition of the audit committee and the composition of the syariah supervisory board on the profitability of sharia commercial banks as measured by Return On Assets (ROA). The Method of this research is quantitatif by using secondary data with documentation technique. The population used in this study is all sharia commercial banks, based on the financial statements of each bank. The observation period in this research is from 2011 to 2016. The sampling technique is done by purposive sampling method. There are 5 banks, namely Bank Muamalat, Bank Sharia Mandiri, Bank Negara Indonesia Sharia, Bank Rakyat Indonesia Sharia, Bank Central Asia Sharia. Data analysis technique used in this research is panel regression. The results showed that independent variables of board of commissioner and syariah supervisory board have no significant effect on financial performance measured by Return on Asset (ROA). The independent variable of the board of directors has a positive and significant impact on the financial performance measured using Return on Assets (ROA), and the audit committee independent variable has a negative and significant effect on the financial performance measured using Return on Assets (ROA).
Plasma modification of construction mortar components, an efficient method of increasing their performance
Authors: Kalyadin Anton Yu. , Nalbandyan Grigor V. , Soloviev Vadim G. , Bogdanova Anfisa A. , Ushkov Valentin A.
Published: June 2019

Introduction. The article considers the enhancement of physical and mechanical parameters of construction mortars used for recovering and repairing of building structures of communication collectors by using low-temperature nonequilibrium plasma. The study vindicated the expediency of treatment of construction mortar raw materials with LTNP to enhance their physical and mechanical parameters. The effect of plasma modification of raw materials on Portland cement phase composition, granulometric composition of the sand and mortar properties are analysed. The influence of multiplicity of silica sand and mixing water plasma treatment on the construction mortar strength is considered.

Materials and methods. Cement-sand mortars are obtained from Portland cement of the CEM I 32.5N and CEM I 42.5N brands and silica sand with the fineness moduli of Mf = 0.32 and Mf = 0.63 and a separate fraction of less than 0.16 mm. Setting time and strength of the building mortars are defined according to GOST state standards in effect. Granulometric composition of the cement is explored by means of Analysette-22 particle size microanalyser, while ARL Optim’X spectrometer is used for studying phase composition of the cement stone, silica sand and cement-sand mortars.

Results. It is determined that the plasma treatment of Portland cement reduces the grout normal consistency by 15 to 17 % and decreases its setting time by a factor of 3 to 4. Treatment of mixing water with the nonequilibrium low-temperature plasma removes its hardness, forming additional crystallization nuclei. The plasma-treated mixing water increases the curing rate of cement-sand mortars up to 50 % at the early stages of hardening and up to 30 % on the 28th day of hardening. Using plasma-treated silica sand decreases size of its particles and results in partial transition of the crystalline structure into the amorphous one. This reduces water demand of the sand by 10 to 18 %.

Conclusions. The expedience of plasma treatment of raw materials to enhance the physical and mechanical properties of mortars is vindicated. Owing to the plasma modification of raw materials, quality and process characteristics of construction mortars are improved. The presented method of the plasma treatment of raw materials used to prepare the construction mortars is characterized with high degree of efficiency and convenience of application.
Validity of geophysical parameters in the mudflow cadastre of the south of Russia
Authors: Anakhayev Koshkinbai N.
Published: June 2019

Introduction. When evaluating mudflow danger level and developing hydroengineering anti-mudflow measures, a great meaning is obtained by mudflow basin cadastres that are widely used as reference sources by water-economic project establishments, scientists, specialists of federal and local authorities. The cadastres influence the made decisions on development of the anti-mudflow measures and protective hydroengineering facilities, since the cadastres include basic dedicated data on mudflow basin locations, geophysical (geomorphometric, hydrological) characteristic and expected mudflow parameters.

Materials and methods. The article uses known and proven methods of analysis of mudflow basin cadastres. The analytical methods are based on a comparative assessment of the presented results with basic geophysical data of primary sources (cadastres published earlier) and on-site investigations as well as compliance of the suggested empirical formulae on determination of mudflow carrying out volumes and indicators of territorial mudflow striking with mathematical and physical conditions of development of the real mudflow phenomena.

Results. Critical analysis of the contents of the Cadastre of Mudflow Danger of the South of the European Part of Russia published in 2015 allows revealing multiple distortions and substitutions of basic geophysical data of mudflow basins. There is an inaccuracy (up to 3,000 to 4,000 % and even higher) of the empirical formulae used in the cadastre for determination of volumes of modflow carrying out. The analysis reveals a hydrogeographical error connected with unfounded substitution of the concept “river length” with the value of the “total length of the main course and all its inflows” that multiply overrates the calculated riverbed length and multiply underrates value of a riverbed bias. Also the study emphasizes unacceptability of definition of the mudflow danger territory by the principle “the water-collecting area of the mudflow course is totally mudflow-threatened" owing to which the absolutely safe natural landscapes are unreasonably declared mudflow-threatened territories.

Conclusions. The stated analysis shows a discrepancy of the considered cadastre to the status of scientific and research work. In this connection, the cadastre cannot be recommended for use both in scientific researches and in practical ones. Recommendations on improvement of the mudflow basin cadastres are provided.
Formalism around 1800: A grudging concession to aesthetic sensibility
Authors: Guyer Paul
Published: June 2019

This paper compares the outwardly similar structural formalisms of Marc-
Antoine Laugier and Arthur Schopenhauer (who uses many of Laugier?s
examples). Laugier purports to base his aesthetics on an historical argument
from the ?primitive hut?; but his preferences are really based on aversion
to structurally and programmatically non-functional elements. His
preferences show disregard for purely aesthetic considerations, such as
pleasing proportions. Schopenhauer?s formalism is based on his cognitivist
approach to aesthetics, according to which architecture is above all
supposed to demonstrate relations between load and support, but in spite of
this shows greater sensitivity to sensory beauty.
The effect of CaO on the recovery of Fe and Ni in a vacuum carbothermal reduction of garnierite
Authors: Wang Q. , Qu T. , Gu X.-P. , Shi L. , Yang B. , Dai Y.
Published: June 2019

The effects of adding CaO during a vacuum carbothermal reduction on Fe and Ni recovery yields were examined. In addition, magnetic separation was investigated. Experiments were conducted under pressures ranging from 10 to 50 Pa with different proportions of CaO at different temperatures. The results indicated that at 1723 K, the mass ratio of ore/C was 100:65.5; when the amount of CaO was 22.64% (the mole ratio of CaO/Si was 1:1), the recovery of Fe and Ni reached 84.33% and 97.00% in the vacuum carbothermal reduction-magnetic separation process, and the enrichment ratios of Fe and Ni were maximized, reaching 6.32 and 6.72, respectively. In addition, the recovery of Mg in the reduction process reached 99.35%. An analysis of the experimental results also indicated that the addition of CaO could cause the Fe-Si alloy to transform into the Fe-Ni alloy in the nickel-rich residue, which increased the content of Fe-Ni in the magnetic separation material from 13.34% to 73.17%. In addition, the concentration in reduced ore of Si from 45.43% increased to 83.68%, which could reduce the evaporation of Si in the form of SiO at high temperatures. If Si volatilized in the form of SiO during the condensation process, SiO would disproportionate to form Si and SiO2 contaminated condensed magnesium. In summary, the valuable metals in the minerals were comprehensively utilized with the addition of CaO.
Yaya Özellik Tanıma için LM Filtre Temelli Derin Evrişimsel Sinir Ağı
Authors: ÜZEN Hüseyin , HANBAY Kazım
Published: June 2019

Günümüzde Evrişimsel Sinir Ağı (ESA) mimarileri güvenlik, endüstri ve
büyük veri gibi birçok farklı alanda aktif olarak kullanılmaktadır. Bu
mimarilerdeki evrişim katmanları, bir sınıflandırma veya tanımlama problemi
için istenilen sonuçları verebilecek en iyi öznitelikleri otomatik olarak
çıkartabilmektedir. Bu çalışmada, hem geleneksel hem de derin öznitelikleri
hesaplamak için yeni bir Hibrit Evrişimsel Sinir Ağı (HESA) mimarisi
önerilmiştir. Bu ağ mimarisinin temel amacı, LM filtrelerinden elde edilen
geleneksel öznitelikler ile ESA mimarisinden elde edilen derin öznitelikleri birleştirerek
güçlü bir öznitelik verisi oluşturmaktır. Önerilen modelde yaya görüntüsünden
elde edilen LM filtre öznitelikleri ve derin öznitelikler eşzamanlı olarak
hesaplanmaktadır. Daha sonra bu öznitelikler birleştirilir ve  farklı öznitelikten oluşan bir
öznitelik vektörü oluşturulur. Bu öznitelik vektörü tam bağlı katmanlar yardımı
ile sınıflandırma işlemine alınır. Geliştirilen HESA mimarisi çok zor bir
problem olan yaya özellik sınıflandırması için uygulanmıştır. Önerilen model PETA
veri tabanında SVM ve MRF tabanlı yöntemlerden önemli ölçüde daha iyi
performans göstermiştir. Ayrıca, ReduceLROnPlateau modelinin HESA
yönteminde kullanılması yüksek başarıların elde edilmesine önemli bir katkı sağlamıştır.
Hava Akışkanlı Güneş Kollektöründe Isı Transferi İyileştirmesine Etki Eden Parametrelerin Taguchi Metodu ile Optimizasyonu
Authors: ATA İsmail , ACIR Adem
Published: June 2019

Bu çalışmada, yutucu yüzeyi üzerinde farklı
geometriye sahip kanatçıklar bulunan hava akışkanlı güneş kollektörlerinde ısı
transferine (Nusselt sayısı) etki eden parametrelerin optimizasyonu için
Taguchi metodu kullanılmıştır. Deney parametresi olarak
dört farklı Reynolds sayısı (Re=3150, 3800, 4400 ve 5000), iki farklı kanatçık
tipi (Tip-I ve Tip-II) ve iki farklı kollektör eğim açısı (α=25° ve 40°)
belirlenmiştir. Üç
farklı deney parametresi olan Reynolds sayısı, kollektör eğim açısı ve yutucu
yüzey kanatçık tipinin kollektörün ısı transferine olan etkileri
incelenmiştir.  Taguchi metodu
kullanılarak elde edilen L8 (41x22)
dikey deney dizilimi ile ısı transferinin maksimum olması için gerekli olan
optimum deney dizilimi tespit edilmesi amaçlanmıştır. En yüksek Nu sayısı
değeri için optimum deney dizilimi A4B2C1(Re=5000, Tip-II, α=25°) olarak elde edilmiştir. Her bir deney
parametresinin ısı transfer miktarına olan etkilerinin analizi için ANOVA
yöntemi kullanılmıştır. Kullanılan deney parametrelerinden deney sonucuna en
yüksek etki eden parametre %73,77 ile Re sayısı olarak bulunmuştur.
Confirmation of Johnson-Cook Model Parameters for Nimonic 80A alloy by Finite Element Method
Authors: KORKMAZ Mehmet Erdi , GÜNAY Mustafa
Published: June 2019

Nimonic
80A superalloy is frequently used due to its high creep resistance, oxidation
resistance and high resistance to high temperature corrosion. On the other
hand, due to compatibility of simulation of plastic deformation processes,
Johnson-Cook model is chosen among the materials models such as Zerille
Armstrong, Bordner Partom, Steinberg-Guinan etc. In this study, primarily,
quasi-static compression tests were performed for 10-3, 10-2 and 10-1 s-1
strain rates at room temperature. Secondly, dynamic compression tests were
secondly conducted at high strain rates ranging from 370 to 954 s-1 using the
Split Hopkinson Pressure Bar (SHPB) apparatus. Then, the compression tests were
conducted at a temperature level from 24~200 °C at the reference strain rate.
Johnson-Cook model parameters of Nimonic 80A were determined by analyzing the
data obtained from the tests. Lastly, the compression simulations with finite
element method (FEM) were performed in ANSYS Workbench to confirm the accuracy
of the parameters. In the light of the results, it was determined that there is
an average of %3.23 deviation between the experimental and the simulation
values. The result showed that accuracy of the Johnson-Cook parameters for
Nimonic 80A superalloy was verified with FEM.
Design of Mathematics Learning Media based on Discovery Learning to Improve Problem Solving Ability
Authors: Darmawan Epa Wira , Suparman Suparman
Published: June 2019

Problem-solving is one of the century skills 21 and are included in the 2013 curriculum. Students with low problem-solving abilities will have difficulty completing math problems that require high-level thinking. Learning media that does not contain problem-solving skills will hinder the achievement of student competence. This research has two objectives. The first objective is to analyze the needs of learning media that are in accordance with student characteristics, curriculum, learning models and teacher readiness. The second objective is to design discovery learning based learning media to improve students' problem-solving abilities. This research uses design research method with type of development studies. The research subjects consisted of teachers and students. Data collection instruments used interview guidelines, observation guidelines, and questionnaires. Interview guides to get information from teachers and students regarding the readiness of teachers in applying the 2013 curriculum and learning difficulties in mathematics. Observation guidelines are used to obtain information about student learning characteristics. The questionnaire is used to get the needs of mathematics learning media. The data analyzed using qualitative descriptive. Research provides several results. First, most students consider learning less attractive. Second, the 2013 curriculum cannot be fully implemented in the classroom. Third, discovery learning models can improve problem-solving skills. Fourth, the design of discovery learning based learning media. This study concludes that discovery learning based media to improve problem-solving skills need to be developed. Keywords: Media Development, Guide Discovery Model, Troubleshooting.
Influence of Extracurricular Services on Students’ Academic Achievement in Secondary Schools in Kwara State: A Qualitative Approach
Authors: Suleiman Yusuf , Hanafi Zahyah , Muhajir Thanslikan
Published: June 2019

Extracurricular services are regarded as essential services in school system. Studies suggest that access to the services lead to students’ academic success. Literature shows that the use of qualitative approach to investigate extracurricular services is limited. In view of the foregoing, this study examined the perceived influence of extracurricular services on students’ academic achievement in secondary schools. Twenty (20) principals were selected from the three senatorial districts of Kwara State using stratified, purposive and convenience sampling techniques. Instruments used include interview and observation methods to collect relevant data from the participants. Specifically, observation method was used to complement findings from interview. Our findings reveal that extracurricular services influenced students’ academic achievement. Also, our findings revealed that inadequate availability of extracurricular facilities and personnel are the factors militating against effective provision of extracurricular services. The study recommends that adequate extracurricular facilities (football pitch, volleyball court, hall for social activities, etc.) should be available in schools. Lastly, adequate extracurricular services personnel should be deployed to schools to ensure active participation of students in various activities.
Trendsetter Muballigh di Medsos: Analisis Framing Instagram Felix Siauw dan Hanan Attaki
Authors: Latifah Nor , Romario Romario
Published: June 2019

The increasing use of Instagram is dominated by users around the age of 15-30 years. The majority who followed in Instagram were famous public figures such as celebrities, political figures and religious leaders. With this Instagram, da'i or preachers can convey their messages easily and free through photos and captions or short videos. This study is important to see how Instagram as a new media is able to become a trendsetter for wellknown Ustadz like Felix Siauw and Hanan Attaki. This study uses a qualitative research method using the framing model as proposed by Robert N. Entman by observing how a discourse or communication is displayed in the public space. The finding confirmed that the framing model of Felix Siauw and Hanan Attaki has similarities in preaching Islam through Instagram social media using short posts or short videos and interesting captions. However, both of them have different tendencies, in which Felix Siauw is more dominant in discussing social and political issues while Hanan Attaki is more dominant in discussing good advice or about love between men and women.
Influencia del sistema start-stop en el vehículo respecto durabilidad de la batería de acumuladores
Authors: Quiroz Erazo Leonidas , Aguilar Santamaría Jhonatan , Rumiguano Jiménez Cristhian , Erazo Laverde Germán
Published: June 2019

En la presente investigación se muestra los cálculos realizados para prever como afecta la instalación del sistema start-stop a la batería del vehículo Hyundai Getz 1.6, para seleccionar una diferente o mantener la misma, así como los resultados de las pruebas realizadas con el sistema en funcionamiento con el vehículo en neutro siguiendo los parámetros de pruebas del ciclo europeo de conducción, NEDC, del cual se obtuvo el tiempo de duración de la prueba y el número de paradas que ocurren. Los cálculos se realizaron tomando en cuenta parámetros tales como el consumo de corriente por parte del motor de arranque durante su activación y el amperaje que requieren los componentes electrónicos que hacen funcionar al sistema. Para esta investigación no se tomaron en cuenta los datos de consumo de combustible ni los niveles de emisiones de los gases de escape.
Paisajes de frontera: conquistas cristianas y transformaciones agrarias (siglos XII al XIV)
Authors: Torró Josep
Published: June 2019

El artículo propone una serie de referentes conceptuales para el estudio de la expansión agraria del sistema feudal europeo en regiones “exteriores” incorporadas mediante conquista militar. La noción de frontera, entendida como movimiento geográfico que prolonga el pillaje de las cabalgadas con la captura de botín territorial o “naturaleza barata”, es presentada como la categoría más adecuada para la formalización conceptual de dichos procesos. A partir de este planteamiento se efectúa una reconsideración esquemática de las experiencias ibéricas a través de lo que se entiende que deben ser los tres grandes ejes analíticos en cualquier tratamiento de la cuestión: los movimientos de población (inmigración colonial y desplazamiento de nativos); la “espacialización” como realización física de la implantación de relaciones sociales señoriales (concentración residencial, regularización de los parcelarios rurales); y la “agrarización” en tanto que culminación de las secuencias de colonización de los ecosistemas capturados.
Les formes de la colonisation agraire médiévale. Apport du droit et de la géographie
Authors: Chouquer Gérard
Published: June 2019

Este artículo destaca la posibilidad de renovar el estudio de la colonización agraria en la Edad Media aprovechando la vía jurídica de análisis del “derecho agrario”, y la via geográfica del análisis de las planimetrías. La idea principal es que la colonización agraria comporta la definición legal de espacios ajenos al derecho ordinario. Para algunos de ellos, se pueden identificar ciertas morfologías planificadas, de las cuales se tratan dos tipos en el artículo: la “centuriación medieval” y la trama en bandas coaxiales. En definitiva, la Edad Media, en sus diversos períodos, revela una gran creatividad jurídica y morfológica.
Etnografí­a, mediaciones y pragmatismo
Authors: Boix Ornela , Semán Pablo
Published: June 2019

Desde un campo de investigación que hasta cierto punto conforma una subdisciplina –la sociologí­a de la música y los aficionados-, la obra de Antoine Hennion contiene un aporte especí­fico y relevante para las ciencias sociales. Los esfuerzos de Hennion cuestionan los lí­mites del construccionismo y dan lugar a una sociologí­a de las irreversibilidades que integra en ensambles heterogéneos las relaciones entre lo humano y lo no humano. En su trabajo, la música ya no será sólo aquello que privilegia la musicologí­a. Pero tampoco esto será negado en nombre de fuerzas sociales abstractas que parecen ser superiores a todas las realidades. La música será una relación, un arreglo heteróclito que debe ser aprehendido en esa complejidad. En este trabajo nos referimos a las discusiones emergentes de su obra que permiten extraer algunas consecuencias para la práctica etnográfica contemporánea. De acuerdo con este objetivo, exponemos primero la posición de Hennion frente al constructivismo, luego abordamos el sentido que cobra el pragmatismo en su elaboración reciente y, finalmente, revisamos los aspectos de la práctica etnográfica que podemos poner en cuestión desde este punto de vista. Especí­ficamente, destacamos el valor del concepto de pragmata para reformular el problema del “punto de vista del nativo” y, sobre todo, para acentuar el carácter dialógico del trabajo etnográfico.
Creativity as a Methodological dimension of Social Research between Quantity and Quality
Authors: Sacchetti Francesco
Published: June 2019

In this work I address creativity in the process of social sciences research, comparing quantitative and qualitative approaches. In discussing creativity I go back to Chomsky and his distinction between rule-governed and rule-changing creativity. In my analysis I suggest that the quantitative approach is characterized by rule-governed creativity, the qualitative one by rule-changing creativity: these are two models of creativity that the Chomskian vision links to a set of rules. Thus in the first case the creation of the tools by which the researcher collects information is submitted to a set of rules related to substantial and procedural competences. In the second case the creative phase does not have a place in the creation of a tool, but rather in a performance. The idea of performance as a constitutive part in qualitative research is analysed on a substantial basis, revealing the implications of distinct creative processes under different methodological choices. Whilst a quantitative approach requires using procedural and substantial competences, I suggest that in a qualitative enquiry the researcher’s fieldwork is considered as a ‘performance’ because of its adaptive character. The researcher is constantly confronted with unforeseen situations, surrounded by an unknown environment. Also, this use of the notion of ‘performance’ comprehends both elements of the process as well as of the outcome of fieldwork, as it recalls peculiar characteristics of qualitative work: action and interaction, personal involvement and, above all, orientation to a purpose (in this context, the teleological purpose of knowledge production).
Experiencias profesionales en intervención psicosocial: el ejercicio narrativo como metodologí­a de reflexividad y vigilancia epistemológica
Authors: Rubilar Donoso Maria Gabriela , Galaz Caterine Joanna
Published: June 2019

Este artí­culo reflexiona acerca del potencial que posee, a nivel metodológico, la producción de narrativas como prácticas emancipadoras y generadora de crí­tica al control social. Para ello se recurre a dos experiencias investigativas de carácter cualitativo llevadas a cabo en Chile con profesionales interventores en ámbitos psicosociales. Se analiza el modo en que los profesionales construyen, en sus producciones narrativas, a los sujetos con los cuales trabajan. También se evidencia la forma en que la producción del ejercicio narrativo puede transformar las prácticas de control, normalización y disciplinamiento para promover acciones más emancipadoras y antiopresivas. El artí­culo muestra la articulación que se genera en el proceso de producción de la narración entre sujeto investigador y profesional de intervención, relación que promueve el desarrollo de un proceso de reflexividad que implica un posicionamiento crí­tico sobre la acción psicosocial. Así­, se explicita la posición teórica-metodológica en el que estas investigaciones se sitúan y se destaca el ejercicio de autoreflexividad y que reconoce la importancia de repensar y examinar la labor tanto de quienes intervienen en lo social como de aquellos que investigan sus prácticas. Palabras Claves: investigación narrativa, reflexividad, discurso crí­tico, control social, resistencia
La modelación como método del conocimiento cientí­fico en las ciencias sociales. El caso del modelo cubano de televisión local
Authors: Herrera Barreda Dagmar , Saladrigas Medina Hilda
Published: June 2019

El artí­culo sustenta la viabilidad del empleo de la modelación como método del conocimiento cientí­fico dentro de las ciencias sociales y, de modo particular, su aplicación al estudio de los procesos comunicativos mediáticos. Parte de definir la modelación, con sus ventajas y riesgos epistemológicos, para luego exponer los pasos seguidos en el análisis de la televisión de cobertura local en Cuba y la conformación de un modelo que posibilitó explicar el funcionamiento de este sistema así­ como sus potencialidades inexploradas para actuar en aras del desarrollo local. Se emplean como técnicas fundamentales para arribar al conocimiento, la investigación bibliográfica documental, la entrevista, la encuesta y la triangulación constante, siempre marcadas por las pautas de la modelación como método cientí­fico. Los resultados abren el camino para conformar una propuesta proyectiva de televisión para el desarrollo local en el contexto cubano.
El MERCOSUR y la inserción externa de Uruguay y Paraguay, 1994-2015
Authors: Gonzalez Germán H. , Cabrera Romero Mariano F.
Published: June 2019

El trabajo ofrece una interpretación del comportamiento de los flujos comerciales en MERCOSUR desde la perspectiva de las economías relativamente pequeñas, apoyado en una batería de indicadores apropiada, y en la discusión de los resultados con la literatura especializada. En particular, se propuso verificar si el MERCOSUR propició una creciente dependencia, y si se vieron afectadas las posibilidades de inserción internacional de estos países por mantenerse dentro del esquema regional. El resultado principal es el rechazo de ambas hipótesis, al tiempo que se plantean interrogantes interesantes para avanzar dentro de esta perspectiva.