bluuebunny/crossref_metadata_2025 huggingface dataset:
Relación entre el uso del aula virtual y el rendimiento académico en estudiantes del curso de Bioquímica para Enfermería de la Universidad de Costa Rica
Authors: Granados Zúñiga Jorge
Published: July 2019

El objetivo de este estudio fue investigar la relación entre el uso del aula virtual y el rendimiento académico en el curso de Bioquímica para Enfermería que imparte la Escuela de Medicina de la Universidad de Costa Rica (UCR). Un primer análisis fue de carácter retrospectivo mediante la revisión de las actas de notas de los cursos impartidos durante el período 2000-2017. No se observó una diferencia estadísticamente significativa (prueba t-Student, α = 0.05) en el porcentaje de aprobación del curso entre antes (70 %) y después (59.5 %) del año 2009, fecha en la que se comenzó a utilizar el aula virtual. Un segundo análisis fue de carácter transversal mediante la correlación entre la nota obtenida en las evaluaciones y el uso del aula virtual por cada estudiante (n=55) en el curso ofrecido durante el segundo ciclo lectivo de 2017. Para el primer examen de dicho curso no se observó una correlación estadísticamente significativa entre la nota y la cantidad de veces que cada estudiante utilizó el aula virtual (prueba t-pareada, α = 0.05); para las evaluaciones siguientes la correlación se incrementó, pero fue baja. Finalmente, se discuten las posibles razones del aparente bajo impacto que el uso del aula virtual ha tenido en este curso y la conveniencia de replantearse la estrategia pedagógica incrementando las lecturas lineales de textos impresos y las actividades docentes en el aula.
Nueva oferta educativa universitaria con enfoque intercultural: el caso de la Maestría en Lengua y Cultura Nahua de la Universidad Veracruzana
Authors: Bernal Lorenzo Daisy , Figueroa Saavedra Miguel
Published: July 2019

El presente artículo tiene como objetivo demostrar, a través de una experiencia de diseño curricular de una oferta educativa con enfoque intercultural la necesidad y posibilidad de diseñar programas impartidos en una lengua indígena nacional (náhuatl) que contribuyan al respeto y valoración de la diversidad lingüística. Este diseño se hizo a partir de un diagnóstico de necesidades formativas, realizado entre 2015 y 2017 a través de cuestionarios a 67 profesionistas hablantes de LIN de Veracruz y 15 empleadores y autoempleados, y entrevistas enfocadas a 14 personas especialistas en el campo de la lingüística y la educación de instituciones veracruzanas, integrando y analizando los datos un equipo base de siete docentes-investigadores. Esta iniciativa se muestra como un ejemplo de buenas prácticas educativas en la demostración de la factibilidad de propuestas de planificación lingüística e intelectualización que doten de prestigio y estatus en la educación superior a lenguas minorizadas y discriminadas, y en el combate contra los prejuicios lingüísticos que aún rigen el sistema educativo mexicano, consolidando un modelo de educación intercultural en México.
Estrategias disposicionales y aprendizajes significativos en el aula virtual
Authors: Duarte-Herrera Marcela , Valdes Lozano Dora Elia , Montalvo Apolín Danitza Elfi
Published: July 2019

Este estudio identificó las estrategias disposicionales empleadas por tutores en el diseño y la implementación de clases a nivel universitario, para promover aprendizajes significativos en un entorno virtual de aprendizaje en ocho diseños instruccionales analizados. Metodológicamente, se siguió el enfoque cualitativo-fenomenológico utilizando como instrumentos el análisis de contenido en cuatro aulas virtuales y entrevistas semiestructuradas efectuadas a una docente y a cinco estudiantes de Psicología en modalidad a distancia con apoyo del aula virtual de una institución universitaria. Se aplicaron cuatro tipos de matrices para el análisis de contenido, con las cuales se identificaron los aspectos motivacionales y los tipos de aprendizaje significativo que se presentan en los diseños instruccionales de los cursos analizados. Para validar el estudio se recurrió a un análisis de datos mediante el proceso de triangulación por instrumentos. Los resultados demostraron que (a) en algunos casos, se hace uso de estrategias disposicionales que promueven aprendizajes significativos con los contenidos discursivos de las actividades y de las retroalimentaciones mediante la comunicación sincrónica y asincrónica; (b) las estrategias que utiliza el cuerpo docente para motivar a sus estudiantes, no son el resultado de un diseño previo e intencionado sino de un proceso intuitivo; (c) las estrategias motivacionales que el profesorado emplea implican el uso de frases o imágenes que motivan a trabajar en los contenidos temáticos. Teniendo en cuenta los resultados del estudio, se recomienda para futuras investigaciones en el ámbito educativo sobre la modalidad a distancia, desarrollar e implementar procesos instruccionales previamente diseñados, donde el personal docente potencie tanto la comunicación efectiva como el proceso de aprendizaje, utilizando estrategias de enseñanza que promuevan la motivación al aprendizaje de modo intencional y pertinente para las dinámicas propias de las aulas virtuales, mostrando flexibilidad y adaptación a las necesidades del estudiantado.
Modeling Bank Capital Adequacy Dynamics and Liquidity Risk Management, Empirical Evidence from the Nigeria Commercial Banks
Authors: Adamgbo Dr. S. L. C. , Toby Prof. A. J. , Momodu Dr. A.A. , Imegi Prof. J.C.
Published: July 2019

This study examines the effects of Capital adequacy on liquidity risk management practices in Nigeria. The secondary time series data were obtained from the annual reports of the fifteen (15) quoted commercial banks in Nigeria as compiled from the Nigeria Stock Exchange Fact book for the period 1989 to 2015. The independent variables capital adequacy are categorised under Tier I, Tier II to total risk assets, capital conservation buffer (CCB), Minimum total capital (MTC) and counter-cyclical Buffer (CCyB). The dependent variable Liquidity risk was modelled with the five variants of capital adequacy measures. The multivariate regression equation were specified and results obtained based on E-views version 9.0. The OLS and cointegration result shows existence of a short run and long run equilibrium relationship between LIQR and capital adequacy (CAR). The Unit root test shows that the variables were stationary at level and first difference i.e. 1(0) and 1(1). The VAR test indicates that fluctuations in liquidity risk are significantly influenced by capital adequacy measures. The granger-causality test shows a unidirectional link between liquidity risk and capital adequacy. The impulse response function (IRF) shows that liquidity risk responded negatively to capital adequacy measures. The variance decomposition results indicates that LIQR accounted for 78.73% of own shocks at the short run, while at the long run accounted for 14.76%, the rest of 86.34% were distributed among the capital adequacy measures with CCB accounted for the highest. This study concludes that transition to Basel III will further mitigate the concentration of liquidity risk and avert systematic failure in the Nigeria banking system. It is recommended that risk management should be a matter policy focus and priority among regulators and operators in Nigeria banking industry.
Uzbekistan's experience in preventing threats: factors and criteria for creating a threat to a sustainable society
Authors: Hollyevich Avazov Komil
Published: July 2019

,
Enhancing maintenance with a data-driven approach
Authors: Ostrowski João , Menyhárt József
Published: July 2019

Constant stream of data has been generated and stored as more devices are being connected to the internet and supported with cloud technologies. The price drop of such applications along with industry 4.0 trending, triggered an explosive growth and demand for many IT modern solutions. From an industrial point of view, sensorization practices are spreading through factories and warehouses where software is constantly adapting to provide actionable insights in a data-driven configuration. The fourth industrial revolution is empowering the manufacturers with solutions for cost reduction, which translates in competitive advantage. The sector of maintenance operations is leading in engineering innovation, from reactive to planned preventive techniques the next step in history of proactive approaches is Predictive Analytics Maintenance.
Computer aided designing and modelling of spur gear pairs having normal and modified straight teeth
Authors: Bodzás Sándor
Published: July 2019

The aim of this publication is to show the process of computer aided designing of the spur gear pairs having normal and modified straight teeth. For designing, the determination of the geometrical parameters is needed. Computer programs have been developed with which gear pairs having normal and modified teeth, with any arbitrary parameters can be analysed, designed and modelled. With these programs gear pairs having concrete geometry have been designed and CAD models have also been drawn to have further meshing, geometrical and TCA (Tooth Contact Analysis).
A multimodal pathway including the basal ganglia in the feline brain
Authors: Benedek G , Keri S , Nagy A , Braunitzer G , Norita M
Published: July 2019

The purpose of this paper is to give an overview of our present knowledge about the feline tecto-thalamo-basal ganglia cortical sensory pathway. We reviewed morphological and electrophysiological studies of the cortical areas, located in ventral bank of the anterior ectosylvian sulcus as well as the region of the insular cortex, the suprageniculate nucleus of the thalamus, caudate nucleus, and the substantia nigra. Microelectrode studies revealed common receptive field properties in all these structures. The receptive fields were extremely large and multisensory, with pronounced sensitivity to motion of visual stimuli. They often demonstrated directional and velocity selectivity. Preference for small visual stimuli was also a frequent finding. However, orientation sensitivity was absent. It became obvious that the structures of the investigated sensory loop exhibit a unique kind of information processing, not found anywhere else in the feline visual system.
STRATEGI PENGEMBANGAN WISATA SYARIAH DI PROVINSI JAWA BARAT
Authors: Misno Misno
Published: July 2019

AbstrakWisata Syariah adalah istilah yang digunakan oleh Kementerian Pariwisata dan Ekonomi Kreatif Republik Indonesia untuk program wisata yang berbasis pada nilai-nilai Syariah Islam. Jawa Barat sebagai salah satu destinasi wisata syariah yang memiliki potensi objek wisata yang bisa dikembangkan sesuai nilai-nilai syariah Islam, yaitu Kampung Dukuh dan Kampung Naga. Tujuan penelitian ini untuk mengidentifikasi potensi wisata syariah di Kampung Dukuh dan Kampung Naga, menganalisis lingkungan internal dan eksternal dan menentukan stra­tegi pengembangan kedua kampung adat sebagai daya tarik wisata syariah. Data dalam penelitian ini diperoleh melalui metode observasi partisipatif, wawancara dan dokumentasi. Hasil penelitian menunjukan kekuatan wisata syariah di Kampung Dukuh dan Kampung Naga me­liputi nilai dan ritual keagamaan masyarakat, objek wisata ziarah, arsi­tektur unik, keindahan alam pegunungan, akses jalan bagus (Kampung Naga). Sedangkan kelemahan Kampung Dukuh dan Kampung Naga meliputi kurang ketersediaan transportasi (Kampung Dukuh), kurang­nya sarana pariwisata, kurang tersedianya lahan parkir (Kampung Dukuh), minimnya fasilitas toilet, belum maksimalnya promosi, belum tersedianya Tourist Information Center (Kampung Dukuh). Berdasarkan analisis kekuatan dan kelemahan dirumuskan empat strategi pengem­bangan yang bisa diterapkan, yaitu strategi pengembangan produk, strategi pengembangan promosi, strategi pariwisata berkelanjutan dan strategi pengembangan Sumber Daya Manusia (SDM) berbasis nilai-nilai Syariat Islam.
MANAJEMEN PENGEMBANGAN PROFESIONALISME GURU
Authors: Septiani Novia
Published: July 2019

Tujuan penulisan ini untuk mengetahui manajemen pengembangan profesionalisme guru. Penelitian ini merupakan penelitian kualitatif dengan menggunakan metode deskriftif. Pengumpulan data dengan wawancara, observasi, dan studi dokumentasi. Analisis data dengan cara penafsiran deskriptif semata-mata. Hasil penelitian ini menunjukan bahwa MTs. Ar-Rosyidiyah Kota Bandung mendukung pengembangan keprofesionalan berkelanjutan dengan merencanakan program kualifikasi pendidikan pendidik, program sertifikasi, program pemberdayaan MGMP, program pengembangan keprofesian berkelanjutan, program supervisi pendidikan, IHT (In House Training), seminar, workshop, USAID, rapat guru, Lesson Study. Program-program tersebut terlaksana secara efektif dan efisien hal ini terbukti dengan hasil pengembangan profesionalisme guru MTs. Ar-Rosyidiyah yaitu dengan diraihnya sejumlah prestasi oleh pendidik, peserta didik, dan lembaga MTs. Ar-Rosyidiyah Kota Bandung.
KEPEMIMPINAN KIYAI PONDOK PESANTREN
Authors: Muslimah Imas
Published: July 2019

Tulisan ini dilatarbelakangi bahwa pondok pesantren merupakan pendidikan tertua dan sampai saat ini memiliki kepercayaan yang tinggi dari masyarakat sekitar. Pesantren mulai membangun dirinya secara “kualitas (mutu)”, seperti halnya pada pola manajemen pondok pesantren tradisional yang perlu sentuhan dalam mengelolanya, supaya dalam proses pembelajaran bisa progres. Dengan adanya kemajuan dalam manajemen diharapkan pondok pesantren mampu mengahsilkan out put yang siap menghadapi tantangan zaman, namun dalam hal ini tak sedikit pondok pesantren yang masih menggunakan pola manjemen pondok pesantren tradisional. Pemegang kendali manajerial di pesantren adalah seorang kiyai, selain sebagai pendidikan atau pengajar. Posisi kepemimpinan kiyai di pesantren lebih menekankan pada aspek kepemilikan saham pesantren dan moralitas serta kedalaman ilmu agama, dan sering mengabaikan aspek manajerial. Kiyai atau pengasuh pondok pesantren merupakan elemen yang sangat esensial bagi suatu pesantren, oleh karenanya, sangat wajar jika pertumbuhannya, pesantren sangat bergantung pada peran seorang kiyai.
MANAJEMEN SARANA DAN PRASARANA MADRASAH
Authors: Nur Aulia Monica Sani
Published: July 2019

Ada sejumlah keterbatasan yang dimiliki oleh Madrasah Tsanawiyah Ma’arif Jatinangor Kabupaten Sumedang, yaitu dalam pengadaan dan pendayagunaan sarana dan prasarana diantaranya dana dan lahan. Sumber dana yang diperoleh hanya berasal dari dana pemerintah yaitu berupa Bantuan Operasional Sekolah (BOS). Lahan yang dimiliki pun sempit karena MTs Ma’arif Jatinangor terletak di perkotaan. Dampaknya proses penggunaan peralatan infokus atau komputer pun bergiliran. Objek penelitian di MTs Ma’arif Jatinangor. Pengumpulan data dilakukan dengan observasi, wawancara dan dokumentasi. Analisis data dilakukan dengan pengkodean. Setelah itu, data dinarasikan kemudian ditarik kesimpulan. Hasil penelitian ini menunjukkan bahwa. 1) Perencanaan sarana dan prasarana di MTs Ma’arif Jatinangor dibuat dalam dua kalsifikasi yaitu program jangka pendek dan panjang atas kesepakatan bersama sesuai dengan analisis kebutuhan madrasah; 2) Pengadaan sarana dan prasarana hanya bersumber dari pemerintah yaitu dari BOS. Peserta didik tidak dipungut biaya sedikit pun serta untuk pengadaan fasilitas semuanya dilakukan dengan cara pembelian; 3) Pengaturan  sarana dan prasarana dilakukan dalam 3 kegiatan yaitu, inventaris, penyimpanan dan pemeliharaan; 4) Penggunaan sarana dan prasarana dengan memanfaatkan fasilitas yang tersedia di madrasah; 5) Penghapusan sarana dan prasarana jika keadaan rusak ringan maka diperbaiki, jika keadaan barang rusak berat dan tidak bisa diperbaiki maka barang tersebut dibuang dan dihapus dari daftar inventaris.
THE UNIQUENESS OF ISLAMIC EDUCATION IN INDONESIA
Authors: Jamaluddin Dindin
Published: July 2019

Islamic education, the oldest education system in Indonesia which is admitted and appreciated for its contribution to the nation building, emerged together with the arrival of Islam to Indonesia, even before the Dutch’s occupation. Afterward, it took its own path, independent of government, clung to its own way and opened to change in that tradition. Islamic religious education institutions called pesantren Initially used the Arabic language as teaching media. When the desire to develop a system of public education for all people at the turn of the 20th century grew, several prominents thougth to look for possibilities to engage in the development of Islamic education. Among the prominent Muslim scholars are K.H. Ahmad Dahlan and K.H. Hashim Asy'ari who initiated to establish Islamic modern schools called madrasahs in many areas. Education in Islamic Schools has become a tool of struggle to achieve independence and freedom in Indonesia. Pesantren which is a model of Islamic education indoctrinated his students to believe that colonialism was a wrong and and they are created diffrently not to invade one another but to live in harmony. That’s why Dutch colonial government refused to subsidize the model of Islamic education in schools because it was considered of no use and will threaten the authority and dignity of the Dutch government.Key Words: Uniqueness Of Islamic, Indonesia.
The impact of student absences on grade outcomes in a neurology clerkship setting
Authors: Cruz Tiana E. , Riddell Rebecca , Gamaldo Charlene E. , Strowd Roy E. , Oakley Christopher , Salas Rachel Marie E.
Published: July 2019

This article was migrated. The article was not marked as recommended. Purpose: To evaluate the potential association between student absenteeism and performance on the National Board of Medical Examiners Clinical Neurology Subject Exam (NBME), a Standardized Patient Exam (SPEX) and the overall clinical performance (CPA) in the Neurology Core Clerkship (NCC). Methods: All medical students rotating through the required 4-week NCC at Johns Hopkins University School of Medicine (JHUSOM) were enrolled in this IRB-approved, retrospective cohort study. Student absences, NBME, SPEX, CPA, and overall final clerkship grades were recorded. Results: Between 2014-2017, 252 students were enrolled. Of the total sample, 68 students (27.0%) were absent from the clerkship. The median absence length was one day, and the range was 0.25 to 7.00 days. The total "other" absences dependent variable (defined in the text) was negative and statistically significant for the NBME (p = 0.01). This model suggests that for an average student, a one day's absence for reasons we categorized as "other", will lead to a slightly more than two-point decrease (2.36) in the NBME percent correct score. Conclusion: Data presented here supports that the NBME graded component decreases with increased "other" absenteeism supporting that increased absences may have a negative effect on student performance in the NCC.
Effect of pinhole and its recovery in CdS/CdTe solar cell through fabrication simulation
Authors: Sarkar Koushik , Ghosh Kamal Kanti
Published: July 2019

The performance of a solar cell is affected by pinhole formation during the deposition of the very thin cadmium sulfide (CdS) film. Insertion of a zinc oxide (ZnO) buffer layer between the top transparent conducting oxide and the window layer can help in the recovery of the performance of the pinhole-affected cadmium sulfide/cadmium telluride (CdTe) solar cell. The authors have made a deeper study about pinhole formation and its effect through modelling and simulation to investigate the influence of the pinhole on cell performance and its recovery. Both surface recombination and trap-assisted tunnelling recombination in the cadmium sulfide/cadmium telluride interface region have been considered separately to investigate thoroughly the effect of a pinhole on the space-charge region and open-circuit voltage (V OC). An efficiency η of 18·67%, an open-circuit voltage V OC of 0·656 V, a short-circuit current I SC of 0·368 A and a fill factor of 76·7% after insertion of the buffer layer have been achieved. However, a poor performance (η of 2·55%, V OC of 0·184 V, I SC of 0·302 A) has been exhibited by the pinhole-affected cell.
Tuna Sahilinde On Altıncı Yüzyılda Kurulmuş Bir Osmanlı Yerleşimi: İsmail Geçidi Kasabası
Authors: ERDOĞRU Mehmet Akif
Published: July 2019

Bu makalede, bugün Ukrayna’da bulunan

Izmayil Geçidi şehrinin, on altıncı yüzyılın ikinci yarı­sında Darüssaade Ağası

Mehmed Ağa tarafından nasıl kurdurulduğu üzerinde durulmaktadır. Osmanlı sultanı

III. Murad, güvenlik ve asayişin olmadığı düşünülen bu bölgede ‘Osmanlı derbent

hukuku’ üze­rine temellendirilen yeni bir köy/kasaba/hisar kurulması görevini,

dönemin Darüssaade Ağası Habeşî Mehmed Ağa’ya vermiştir. Öncelikle bu bölgenin

sınırı tespit edilmiş, bu bölge Mehmed Ağa’ya temlik edilmiş ve nihayet Mehmed

Ağa da, dönemin mutat bir uygulaması olarak bu temliki vakfa çevirmiştir.

Osmanlı arşiv belgelerinden İsmail Geçidi Kasabası’nın başlangıçta Müslüman ve

gayrimüslimlerden oluşan karma bir yerleşim yeri olarak kurulduğu görülür. Müslümanlar,

buradaki kalede asker olarak görevlendirilmişken, Hristiyanların çiftçi, balıkçı

ve tacir olarak çalıştırıldıkları görülür. Kili, Bender ve Akkerman arasında,

hem deniz hem de kara güzergâhında önemli bir kavşakta bulunan bu yer kısa süre

içinde, Tuna sahilinde önemli bir yerleşim yeri olarak gelişmiştir. Mehmed Ağa,

burada kendi adına bir cami inşa ettirmiş ve kasabayı mimari açıdan bir Osmanlı-İslam

şehri haline getirmeye çalışmıştır.
Vakıf Medeniyeti
Authors: İNALCIK Halil
Published: July 2019

İslam toplumunun, dinin öngördüğü kurallar çerçevesince yaşamını emniyetle sürdürebilmesi için gerekli koşulları ve kurumları devletin devamlı sağlaması mümkün değildir. Tarihte İslam Devleti bu görevi esas itibariyle vakıf yoluyla yerine getirmiştir. Devlet, siyasetin kararsızlığı, geçici karakteri dolayısıyla İslam toplumu için gerekli sosyal hizmetleri devamlı bir görev, bir hayır işi olarak hayır kurumuna bırakmıştır. Genelde dini görevler cami, mescit, medrese, mektep inşaası, idamesi, fakirlerin, yolcuların korunması için zaviye ve imaret tesislerin kurulması, halk için hastane, tıbbi hizmetler, hatta ilaç temini, bunun gibi yüzlerce sosyal hizmet devamlı olarak ancak bu yolla sağlanabilmiştir.
Vakıflar Dergisi 2013-2019 Yayın Dönemi (40-50. Sayılar) Değerlendirmesi ve Bibliyografyası
Authors: DEMİRTAŞ Hasan
Published: July 2019

1938’de

yayın hayatına başlayan Vakıflar Dergisi, Aralık 2018’de yayımlanan 50. Sayısı

ile birlikte 80. Yılını doldurmuştur. Bu süre içerisinde vakıflar alanında yüzlerce

makale, değerlendirme ve tanıtım yazısı söz konusu dergide yayınlanmıştır. Üç bölümden

oluşan bu çalışmanın ilk bölümünde Vakıflar Dergisi üzerine yapılan değerlendirmeler

ile bibliyografya çalışmalarına genel hatlarıyla değinilmiştir. İkinci bölümde

derginin 2013-2019 yılları arasında altı aylık periyotlarla yayımlanan on sayı

(40-50) ile yine bu dönemde yayınlanan iki adet özel sayı üzerine analizler yapılmıştır.

Vakıflar Dergisi’ne yayın­lanması amacıyla gönderilen makaleler, makalelerin

alan bilgileri, yazar profilleri, hakemlerler ve ha­kem inceleme süreci ile bu

süreç sonucunda yayınlanan, reddedilen ya da yazarlarından yeniden sunum

istenilen makaleler hakkında rakamsal veriler okuyucu ile paylaşılmıştır. Üçüncü

bölümü ise ekler kıs­mında verilen bibliyografya oluşturmaktadır. Çalışmanın

kaynağını Vakıflar Dergisi Yayın Kurulu’nun 2013-2019 yılları arasında yapmış

olduğu toplantılara ait karar tutanakları ile dergide yayımlanan maka­leler oluşurmaktadır.

Çalışmanın ekler kısmındaki yazar soyadlarına göre alfabetik hazırlanan

bibliyog­rafyada yer alan makale başlıkları Türkiye dışındaki vakıf araştırmacılarının

da yararlanabilmesi için aynı zamanda İngilizce olarak verilmiştir.
Development and industrial tests of composite material based on TiB2 for repair of local destructions in electrolyzer bottom blocks
Authors: Nagibin G. E. , Zavadyak A. V. , Puzanov I. I. , Proshkin A. V. , Fedorova E. N. , Dobrosmyslov S. S. , Kirillova I. A. , Sukhodoeva N. V.
Published: July 2019

The paper presents the developed composition and technology for obtaining a repair mixture consisting of lumped corundum with a TiB2–C composite coating wettable with aluminum for restoration of local bottom block fractures without electrolyzer stops. The proposed technical solution made it possible to reduce bottom wear and increase aluminum electrolyzer service life by 6 months.A mixture of titanium diboride powder and a refractory powder-like binder in a ratio of 50 : 50 (wt.%) was used to obtain the repair mixture with an optimal composition. Then the lumped corundum was coated with the obtained mixture, dried at 150 °C and after that heat-treated under a carbon-bed at t= 700÷900 °C. As a result of reducing firing the TiB2–C composite material with a carbon content of 15–20 wt.% was formed on the surface of lumped corundum. A qualitative evaluation of the properties of the developed composite coating shows that the coating has a sufficiently high hardness, wear resistance and adhesion to the substrate after the heat treatment. For pilot testing, the repair mixture was covered with molten aluminum to obtain an Al–TiB2–C repair mass in the form of plates. The pilot testing of the repair mass on the 400 kA operating electrolyzer in the RUSAL-Sayanogorsk pilot shop showed that the bottom wear have slowed down 3 months after the local fractures were restored without electrolysis bath stops. This fact is evidenced by a 13 % decrease in the average depth of fractures with a stable current value of 4,7–4,8 kA/bloom after repair. Thus, the locallyused repair mass slowed that the overall wear of the cathode surface and allowed to extend the electrolyzer life.
Production of the Al–B master alloy by KBF4and B 2O3aluminothermic reduction in molten salt flux medium
Authors: Kataev A. A. , Tkacheva O. Yu. , Molchanova N. G. , Zaikov Yu. P.
Published: July 2019

The study covers the process of obtaining the Al–B master alloy by the KBF4and B2O3aluminothermic reduction using KF–AlF3and KF–NaF–AlF3fluoride fluxes at 983 and 1123 К, respectively, and KCl–NaCl–KF chloride-fluoride fluxes at Т= 1173÷1223 К. All experiments were carried out under the same conditions: molten mixture stirring rate was 400 rpm, synthesis duration was 30min. The maximum amount of boron (1,5 %) in the Al–B alloy was obtained when using KBF4(3 % per B) as a boron-containing raw material in the KF–AlF3medium with a molar (cryolite) ratio (CR) of KF/AlF3equal to 1,3, atТ= 983 К, while boron recovery ratio did not exceed 75 %. Comparable results were obtained in experiments with KF–NaF–AlF3f lux (CR = 1,5) at Т= 1123 К. However, with the increased concentration of fed boron its recovery ratio decreased substantially. It is connected with the higher decomposition temperature of not only KBF4, but also less thermally stable NaBF4 formed as a result of exchange reaction in the melt. Therefore it is not recommended to use sodium salts as a f lux component. The Al–B master alloys obtained by KBF4reduction in fluoride fluxes were solid solutions of B in Al containing the AlB2intermetallic compound. The lowest amount of boron in aluminum with the minimum degree of extraction was obtained in experiments with the B2O3in molten KF–AlF3with CR = 1,5. Nevertheless, the results of scanning electron microscopy indicate a uniform distribution of B over the Al matrix and the absence of intermetallic compounds, while a large amount of Al2O3was found, which is the product of B2O3reactions with both liquid Al and KF–AlF3flux.
Heterophase ceramics in the Hf–Si–Mo–B system obtained by a combination of SHS and hot pressing methods
Authors: Pogozhev Yu. S. , Lemesheva M. V. , Potanin A. Yu. , Rupasov S. I. , Vershinnikov V. I. , Levashov E. A.
Published: July 2019

The paper focuses on obtaining heterophase powder ceramics and consolidated ceramics based on borides and silicides of hafnium and molybdenum by combining the methods of self-propagating high-temperature synthesis (SHS) and hot pressing (HP). Composite ceramic SHS powders HfB2–HfSi2–MoSi2 were obtained according to the scheme of magnesium-thermal reduction from oxide raw materials where the combustion wave is characterized by temperatures of 1750–2119 K and high mass combustion rates of 8,4– 9,3 g/s. The structure of synthesized SHS powders consists of relatively large MoSi2 grains up to 10 μm in size and submicron elongated HfB2 grains located mainly inside the MoSi2 grains and rounded Si precipitates. The composition with a lower concentration of boron contains a large number of polyhedral HfSi2 grains with a size of less than 10 μm. The resulting powders are characterized by an average particle size of ~6 μm with a maximum size up to 26 μm. Phase compositions of ceramics consolidated by the HP method and SHS synthesized powders are identical. The microstructure of compact samples consists of faceted HfB2 elongated grains 0,5– 10,0 μm in size, polyhedral HfSi2 and MoSi2 grains up to 8–10 μm in size and silicon interlayers. Consolidated ceramics has a high structural and chemical homogeneity, low residual porosity of 1,1–1,7 %, high hardness of 11,7–12,6 GPa and thermal conductivity of 62–87 W/(m·K).
Research of grain size homogeneity effect on sheet stamping ability characteristics of Al2Mg and Al6Mg alloys
Authors: Nosova E. A. , Fadeeva A. A. , Starodubtseva M. A.
Published: July 2019

The quality of products made of sheet aluminum alloys strongly depends on the technological features of the sheet stamping process, as well as on the structure of sheet semi-finished products. The grain size and grain structure uniformity are among the key structural features that influence stampability. A method is proposed and the homogeneity of the grain structure is evaluated. Stampability of Al2Mg and Al6Mg aluminium alloys was evaluated based on measurements of the spring back index, minimum bending radius, stamping ratio, and Martens strain index. Cold work (with a strain degree of 20 %) and subsequent recrystallization annealing at temperatures of 250, 350 and 450 °C for 1 h were used to obtain a grain structure of (26,8 Ѓ} 7,4)÷(126 Ѓ} 43) μm (Al6Mg alloy) and (120 Ѓ} 11)÷(264 Ѓ} 130) μm (Al2Mg alloy) in size. As a result of processing, the effect of the initial grain size was revealed: the coarser structure of the Al2Mg alloy led to a larger grain size after strain and annealing. It was found that an increase in the grain size in both alloys leads to an increase in the Martens index and a decrease in the stamping ratio, which indicates higher stampability of the alloys in the drawing operations of sheet stamping. In the Al2Mg alloy, an increase in the grain size leads to a decrease in the spring back index by 1,5–1,7 times, and an increase in the minimum bending radius. In the Al6Mg alloy, an increase in the grain size leads to an increase in the spring back index by 1,1–1,2 times, and a decrease in the minimum bending radius. The Al6Mg minimum bending radius remains higher compared to Al2Mg regardless of the grain size. Grain size inhomogeneity in the Al6Mg alloy causes an increase in the Martens index and minimum bending radius, and a decrease in the stamping ratio. In the Al2Mg alloy, grain size inhomogeneity causes an increase in the Martens index and minimum bending radius, and a decrease in the stamping ratio. For the spring back index, the increase in grain size inhomogeneity causes a high scatter of data. In the Al6Mg alloy, the low annealing temperature led to the preservation of the non-recrystallized structure, which influenced the decrease in stampability.
Peculiarities of zinc coating corrosion in neutral environments with inhibitors based on benzotriazole, cyclohexylamine and morpholine
Authors: Kanunnikova O. M. , Aksenova V. V. , Pushkarev B. E. , Ladyanov V. I.
Published: July 2019

The influence of domestic VNKh-L type nitrogen-containing corrosion inhibitors on the corrosion patterns of zinc coating on steel in a neutral environment was investigated. The paper aims to study the structure of the corroding zinc coating surface, as well as the influence of conditions simulating the degradation of inhibitors under actual application conditions on their protective properties. Mechanical activation in a ball planetary mill was used to simulate the thermal and deformation conditions of inhibitors. Zinc coating corrosion on steel was carried out in a sulfate-chloride environment simulating atmospheric corrosion and in borate buffer solution. The concentration of inhibitors in corrosion environments was 0,2 wt.%. The corroded surface morphology of the zinc coating was studied using the Philips SEM-515 scanning electron microscope (at an accelerating voltage of 10 kV) with an X-ray micro probe. Studies of the zinc coating corrosion rate on St 08 were carried out by the indirect measurement of corrosion resistance using the MONIKOR-1 corrosion meter. Borate buffer solution (Na2B4O7 + H3BO3, pH = 6,6) and the solution simulating atmospheric corrosion (NaCl + + Na2SO4, pH = 6,0) were used as corrosive environments. The corrosion rate of samples in corrosive environments without inhibitors was taken as 1. Exposure time of each sample in corrosive environments was 3 h. The chemical composition of corrosion products was studied by mirror reflection in the IR range. The IR spectra of metal plate surfaces were recorded on the FSM-1202 IR Fourier spectrometer in a wavelength range of 450–4000 cm–1 with a resolution of 2 cm–1 and an accumulation of 100 scans. A mirror reflection attachment with a 10° angle of incidence was used to obtain reflection spectra. The zinc coating corrosion rate in sulfate-chloride and borate environments in the presence of inhibitors based on benzotriazole and cyclohexylamine was virtually not reduced compared to the corrosion rate in the same environments without inhibitors. When both initial and mechanically activated inhibitors based on morpholine and benzotriazole are added to the corrosion environment, the iron corrosion rate decreases compared to the corrosion rate in the same environments without inhibitors. In the presence of initial and mechanically activated inhibitors of both groups, pitting corrosion of the zinc coating in the studied corrosion environments is observed. At the same time, the pitting depth under corrosion conditions is less than the zinc coating thickness.
Development of high-magnesium alloy composition to create a temporary seals used in oil industry
Authors: Rakoch A. G. , Predein N. A. , Gladkova A. A. , Koltygin A. V. , Vorozhtsova V. V.
Published: July 2019

Alloy composition was developed and heat treatment conditions were selected to obtain an intensively dissolving magnesium alloy to be used as a ball plug under oil-well precommissioning conditions, i.e. to seal various well sections with further near-complete destruction of these plugs for a short time (up to 11 h). It was found that the reason of high dissolution rate of Mg alloy with a composition similar to high-strength ML6 is a higher nickel content (up to 0,19 %). The compounds of this element are located along the grain boundaries, and it leads to intense intercrystalline corrosion of the alloy in a medium containing chlorine ions. It is shown that an effective method for controlling the Mg alloy dissolution rate is to synthesize coatings on its surface with various thicknesses by plasma electrolytic treatment (PET) in aqueous solution containing 110 g/l of commercial water glass. This method allowed synthesizing coatings with a thickness from 10 to 41 μm on the experimental magnesium alloy with increased nickel concentrations (~ 0,19 %) in a short period of time (from 10 to 20 min) with low set AC current density (4 A/dm2) – galvanostatic mode of PET processes. Corrosion investigations were carried out in 3 % KCl aqueous solution at 93 ± 2 °C. PET coatings were obtained on the magnesium alloy using a capacitive unit. Corrosion tests conditions for materials used as ball plugs in oil well seals were similar to that cited in foreign researches.
Ellipsometric study of optical properties and oxidation processes of compacted powders based on aluminum alloys
Authors: Akashev L. A. , Popov N. A. , Shevchenko V. G. , Ananyev A. I.
Published: July 2019

The paper presents the results of an ellipsometric study of compacted powders of aluminum-based binary alloys containing 1,5 wt.% of rare earth elements (Sc, La, Ce, Sm) and cast aluminum-silicon alloys with the following compositions: Al–10Si–0,5Mg– 0,3Fe–0,1Ca and Al–12Si–0,6Mg–0,5Fe–0,5Ca–0,45Na. An immersion method was used to determine the optical constants of massive polycrystalline alloys obtained by remelting these powders in vacuum, as well as their oxide films for a wavelength λ = 0,6328 μm. Using the optical constants of these alloys, the dependence of their reflectivity on the surface oxide film thickness was calculated. It was found that an increase in the amount of the alloying component and intermetallic phases in the alloy decreases its reflectivity. In addition, the optical constants were used in the construction of modified Δ–ψ nomograms calculated using the Maxwell-Garnett equation that make it possible to determine the thicknesses of oxide films on particles and the volume fractions of metal in compacted powders, and to study the processes of their oxidation in air. It was shown that oxidation of aluminum ASD-4 powders and Al–1,5% REM binary alloys at 600 °C is described by a simple model where a decrease in the metal fraction leads to an increase in the oxide film thickness. It turned out that the oxidation of aluminum-silicon alloys is much faster and not described by this model, which may be due to the appearance of a liquid phase in the powder. A large number of metal droplets on the surface of particles increase the amount of metal on the studied tablet surface in general. The high oxidation rate of aluminumsilicon alloys in air can be explained by the surface activity of magnesium in relation to liquid aluminum.
Nb2AlC MAX phase synthesis by SHS metallurgy
Authors: Kovalev I. D. , Miloserdov P. A. , Gorshkov V. A. , Kovalev D. Yu.
Published: July 2019

A cast material based on the Nb2AlC MAX phase was obtained by SHS metallurgy. Synthesis was carried out from the Nb2O5– Al–C mixture with a high-energy CaO2–Al additive. Thermodynamic calculation results correlate well with experimental data. It was found that the CaO2–Al additive content has a substantial effect on the thermodynamic parameters and phase composition of the final product. It was shown that synthesis from the specified mixtures passed in a stationary mode with steady combustion wave. Increasing the additive content leads to increasing combustion rate (from 6 to 12 mm/s), and product yield to ingot increases (from 30 to 47 %) up to 15 wt.% of the additive and then decreases. Variation in the composition of initial mixtures can provide a significant impact on both synthesis parameters and final product phase composition. Optimal conditions of material synthesis to ensure maximum yield of the Nb2AlC MAX phase in the ingot composition were determined. The liquid phase lifetime during synthesis is a determining factor influencing the Nb2AlC content in the final product. It is shown that the maximum Nb2AlC phase amount (67 wt.%) is reached with 15 wt.% of the high-energy additive in the initial charge.
Evgeny Alexandrovich Levashov celebrates his 60-th anniversary
Authors: Editorial Article
Published: July 2019

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The Currie Cup Premiership Competition Injury Surveillance Report 2014 - 2018
Authors: Starling L , Readhead C , Viljoen W , Lambert M
Published: July 2019

The Currie Cup Premiership Competition Injury Surveillance Report 2014 - 2018
Islamic Political Economy: Critical Review of Economic Policy in Indonesia
Authors: Marlina Ropi , Juliana J. Juliana , Adila N. Amalia , Robbani M. Bilal
Published: July 2019

This article is based on a phenomenon of inequality that occurs in Indonesia which is still quite high. Besides, the current reality shows that the implementation of political economy has not been able to meet the primary needs of each individual. The purpose of this article is to describe and elaborate the concepts and objectives of Islamic political economy. The used method is a qualitative descriptive method with a literature review approach with sources from books, journals, news and other sources relevant to the title. The results of the discussion of this article show that economic politics in perspective of Islam has a different perspective from capitalists. Islamic Political Economics aim to fulfill the primary needs (food, shelter and clothing) of each individual. In implementing the Islamic Political Economy, the state has an important role to play, either directly or indirectly. As for case studies in Indonesia, regarding aspects of fulfilling food needs, it is ranked 73rd in the world with GHI of 21.9. This is a very large number with a serious level. The number shows that Indonesian government has not been able to fulfill one of the political goals of Islamic economics, namely the fulfillment of each individual's food. In addition, in terms of security, education and health have not also been well fulfilled. It is expected that this writing able to become a reference and add to the treasure of thought regarding the Islamic economy.
Upaya Mengembangkan Nilai–Nilai Kerjasama Melalui Penerapan Permainan Tradisional Bakiak Dan Gatrik
Authors: Febriani Nova Suci , Budiana Dian
Published: July 2019

Penelitian ini dilatarbelakangi oleh rendahnya nilai-nilai kerjasama dalam aktivitas pembelajaran pendidikan jasmani. Tujuan penelitian ini untuk mengetahui apakah pembelajaran tradisional bakiak dan gatrik dapat membangun nilai kerjasama (pada siswa kelas V SDN Gegerkalong Girang 1-2) yang berjumlah 31 siswa, yaitu 12 laki-laki dan 19 perempuan. Metode yang digunakan dalam penelitian ini adalah Penelitian Tindakan Kelas (PTK) dengan menggunakan dua siklus  dan masing-masing siklus terdapat dua tindakan, data penelitian ini diambil dengan menggunakan lembar pengamatan (observasi).  Hasil observasi awal menunjukkan bahwa nilai kerjasama siswa masih terlihat  rendah dalam pembelajaran, hal ini ditunjukkan dengan nilai-nilai kerjasama sebesar 39,35 % yang seharusnya 75 %  dari seluruh aspek. Selanjutnya hasil siklus I tindakan I dengan nilai sebesar 49,64 %. Kemudian setelah diadakan  hasil siklus I tindakan 2 dengan memberikan treatment yaitu dengan menambahkan peraturan baru dan memberikan reward, sehingga siswa sangat antusias terhadap permainan tradisional maka dari itu perolehan nilai-nilai kerjasama meningkat menjadi  57,42 %  . Selanjutnya hasil siklus 2 tindakan I didapatkan nilai kerjasama menjadi 69,42 %. Pada akhirnya  hasil siklus 2 tindakan 2 kembali meningkat dengan nilai persentase 80,05 % . Setelah melalui dua siklus rata-rata nilai-nilai kerjasama dalam permainan tradisional mengalami peningkatan yang signifikan. Kesimpulan penelitian ini adalah adanya peningkatan nilai-nilai kerjasama melalui penerapan permainan tradisional
Penerapan Model Hellison Dan Pendekatan Soccer Like Games Dalam Meningkatkan Tanggung Jawab Dan Keterampilan Bermain Sepak Bola
Authors: Elma Baisyah Husnul Afwa , Budiman Didin
Published: July 2019

Mayoritas siswa terlihat memiliki sikap tanggung jawab pribadi dan sosial yang rendah terutama ketika terlibat dalam pembelajaran dan permainan. Penelitian ini bertujuan untuk meningkatkan tanggung jawab dan keterampilan bermain sepak bola melalui penerapan model Hellison dan pendekatan soccer like games pada siswa kelas V SDPN Setiabudi Kota Bandung. Subjek penelitian seluruhnya berjumlah 35 siswa, yang terdiri dari 20 siswa putra dan 15 siswa puteri. Adapun metode penelitian yang digunakan adalah penelitian tindakan kelas (PTK), dengan GPAI dan lembar observasi perilaku tanggung jawab serta catatan lapangan dan dokumentasi sebagai instrumennya.Penelitian melibatkan dua siklus dan setiap siklus terdiri dari dua tindakan. Hasil analisis data dari siklus I dan II menyimpulkan bahwa tanggung jawab siswa meningkat dari 32,00% ke 86,29%, dan keterampilan bermain siswa meningkat dari 54,19% ke 83,52%. Berdasarkan hasil tersebut, dapat disimpulkan bahwa penerapan model pembelajaran Hellison dan pendekatan soccer like games dapat meningkatkan sikap tanggung jawab dan keterampilan bermain siswa dalam pembelajaran permainan sepak bola pada kelas V SDPN Setiabudhi Kota Bandung.
Penerapan Model Movement Problem Based Learning Soccer Like Games
Authors: Fauzi Nurul , Lubay Luqmanul Hakim
Published: July 2019

Penelitian ini bertujuan untuk meneliti keterampilan bermain siswa melalui penerapan model movement problem based learning dalam soccer like games. Metode penelitian yang digunakan melalui metode Penelitian Tindakan Kelas, Tempat penelitian di Sekolah Dasar Negri Tagog dengan objek penelitian siswa kelas IV berjumlah 25 orang. Proses penelitian dibagi menjadi II siklus, setiap siklus terdiri dari 2 tindakan. Setiap tindakan menggunakan berbagai tugas gerak yang dikemas dalam bentuk permainan. Data dikumpulkan dengan menggunakan instrumen GPAI. Kemudian semua data yang terkumpul dianalisis menggunakan teknik persentase. Nilai rata-rata keseluruhan data awal adalah 59% dan siklus I tindakan I adalah 66%, siklus I tindakan II adalah 68%, siklus II tindakan I adalah 72%, dan siklus II tindakan II adalah 76%. Dari rata-rata aspek keterampilan bermain berdasarkan hasil analisis data, diperoleh kesimpulan bahwa melalui penerapan model movement problem based learning dapat meningkatkan keterampilan bermain siswa dalam pembelajaran soccer like games. Sebagai saran dari hasil penelitian, dalam pemberian materi pembelajaran soccer like games, hendaknya diberikan berbagai tugas gerak yang dikemas dalam bentuk permainan
Pengaruh Permainan Tradisional terhadap Kemampuan Perseptual Motorik Anak di SDN Margawatu II Garut Kota
Authors: Kusmiati Ai Melis , Sumarno Gano
Published: July 2019

Penelitian ini bertujuan untuk mengetahui pengaruh permainan tradisional terhadap kemampuan perseptual motorik anak di SDN Margawati II Garut Kota. Metode penelitian menggunakan eksperimen dengan desain Pretest-Posttest Control Group Design. Populasi dalam penelitian ini adalah siswa kelas III SDN Margawati II Garut Kota, sedangkan sampel penelitian terdiri dari 40 orang, 20 orang siswa yang diberikan permainan tradisional dan 20 orang siswa sebagai kelompok kontrol atau yang tidak diberikan permainan tradisional. Pemilihan sampel menggunakan teknik sampel jenuh, yakni seluruh populasi dijadikan sampel. Instrumen penelitian menggunakan tes perseptual motorik dengan reliabilitas 0.75.  Analisis data menggunakan statistika non parametrik Wilcoxon test. Berdasarkan pengolahan dan analisis data, dapat diketahui nilai Whitung 4.0 dan nilai Wtabel sebesar 52 (α= 0.05). Karena nilai Whitung lebih kecil dari Wtabel maka Ho ditolak. Jadi dapat disimpulkan bahwa permainan tradisional berpengaruh secara signifikan terhadap kemampuan perseptual motorik anak di SDN Margawati II Garut Kota.  Abstract The purpose of this research was to find out whether the traditional games gave significant impacts on student’s perceptual motor in SDN Margawati II, Garut Kota. Experimental study methodology was used in this research by using Pretest-Posttest Control Group Design. The population of this research was third grade students of SDN Margawati II Garut Kota, while the sample of this research involved 40 students, 20 students received the traditional game instructions and 20 students as control group who did not receive the traditional game instruction. The sampling technique used was saturated sampling technique in which all of the populations are included as samples. The research instrument was perceptual motor test by Prof. Hari Amirullah Rachman which had trial validity 14.3 and the reability 0.75. Data analysis used statistic non parametric with Wilcoxon test. The data analysis showed that Wscore 4.0 and Wtable distribution 52 (α= 0.05). Since Wscore was lower than Wtable, accordingly H0 is rejected. Therefore, it can be concluded that the traditional games give significant impacts on students’ perceptual motor skill.