bluuebunny/crossref_metadata_2025_split huggingface dataset:
Phase and structural transformations in copper and its alloys under the electrolytic discharge
Authors: Fedorenkova L. I. 
Published: July 2019

Copper and its alloy were treated in an electrolytic plasma formed in the boron-containing electrolyte under the action of discharge in order to obtain a diffusion coating with enhanced hardening characteristics and the structural changes in the surface layer of the metal that occur in this case were studied. As a result of processing in electrolytic plasma, characterized by high heating and cooling rates, a diffusion layer was formed on the surface of copper and an alloy based on it (brass). The layer contains nanosized inclusions of copper borides, ternary compounds Cu-B-H, Cu-B-O concentrated mainly along grain and phase boundaries and providing hardening of the metal surface. The action of the discharge provides structural and phase transformations in the metal, the deformation of the grains - elongation in the direction of the driving force (electric transfer) at a depth of 100 μm and the creation of metastable states in the surface layers. Moving vacancies and compressing atoms in the direction of the force create conditions for the rapid movement of boron atoms. With increase in current density and time of treating, the size of nanostructures decreases. Their size is of the order of 6-16 nm. Obtaining wear-resistant coatings on copper and its alloys, which include phases containing copper and boron, increases the strength characteristics of copper and its alloys by 1.5-2 times.
The peculiarities of formation and thermodynamic functions of τ-phase
Authors: Filonenko N. Yu. , Galdina O. M. 
Published: July 2019

It is shown that for alloys with boron content of 0.1–6.5% (wt.) and carbon content of 0.3–4.0% (wt.) without pretreatment no formation of cubic boron carbide takes place under crystallization. The cubic boron carbide can be obtained by pre-annealing at a temperature of 1173 K for an hour and further heating to a temperature of 30 K above the liquidus and cooling of alloys with boron content of 2.5–4.0% (wt.) and carbon content of 0.8–3.0% (wt.). Formation of crystals of cubic boron carbide is possible as a constituent of multiphase inclusions for alloys with boron content of 0.1–0.3% (wt.) and carbon content up to 0.4–0.5% (wt). It should be noted that for alloys with boron content of 4.2–6.0% (wt.) and carbon content of more than 3.0% (wt.) the pretreatment does not result in formation of cubic boron carbide. The increase in boron content in the alloy to 0.3–0.5% (wt.) and carbon content to 0.5–0.7% (wt.) leads to formation of the eutectic α-Fe+Fe23(CB)6, which is arranged on the boundaries of pearlite grains. The thermodynamic functions of Fe23(CB)6 cubic boron carbide are derived for the first time using the Hillert and Staffonsson model and accounting for the first degree approximation of high-temperature expansion of the thermodynamic potential for binary alloys. We obtain temperature dependences of such thermodynamic functions for Fе23(CB)6 phase as Gibbs energy, entropy, enthalpy and heat capacity CP , as well as calculate their values at the formation temperature of the phase. The approach used in this paper enables to give the most complete from the thermodynamic point of view description of cubic boron carbide formed from a liquid.
Investigation of the photoluminescence spectra of rare-earth elements in pores of an opal matrix
Authors: Ohiienko O. V. , Posmashnyi S. V. , Shvetz T. V. 
Published: July 2019

The main idea of this paper is researching the light emission of Eu3+ and Dy3+ in an opal matrix. The opal synthesis was carried out using Stöber method. The size of globules calculated from the transmission spectrum of prepared samples is equal to 231 nm. The samples were infiltrated with rare-earth element oxides in concentrated solution of nitric HNO3 and perchloric HCl acids in the ratio 3:1. Next, the samples were heated to 100°C to reduce the relative content of water. The spectra of photoluminescence in the range 420-640 nm were excited by a semiconductor laser with λ=405 nm at the radiation registration along the direction of growth [111]. In the spectrum of the sample infiltrated by europium, there are distinctive europium lines at 580, 593 and 618 nm, which correspond to the typical transitions of this rare-earth element, such as 5D0→7F0, 5D0→7F1 and 5D0→7F2. Distinctive spectral lines of dysprosium luminescence are at wavelengths of 480 and 572 nm. The maxima of these wavelengths correspond to the typical lines of luminescence of trivalent dysprosium – specifically, transitions 4D9/2→6H13/2 and 4D9/2→6H11/2. The influence of photonic crystalline effects on the photoluminescence spectra of the obtained samples is studied.
An integral equation technique for the analysis of phased array antenna with matching step discontinuities
Authors: Gnatyuk M. A. , Morozov V. M. 
Published: July 2019

Applying the integral equation method of overlapping partial domains and the Schwartz alternating method to solving an electromagnetic wave diffraction problem is considered in this paper. The infinite rectangular waveguide phased array antenna scanning in H plane which waveguides have step matching discontinuities is represented. The whole field definition domain is sliced into three overlapping partial domains. The system of integral representations for unknown Ey components of the electrical field vector in each domain is set up using Greenʼs functions. Unknown functions in each domain are presented as orthogonal eigenfunction series. Using Galerkinʼs procedure, the system of integral representations is reduced to the system of linear equations for unknown expansion coefficients. For Schwartz method the system of integral representation is solved using iterative methods. The dependences of the reflection coefficient magnitude and phase on the value of scan angle are obtained. The comparison of obtained results for particular cases with known ones is performed.
Adaptación del método Acreman para la limpieza de plantas en Lemna minuta (Araceae: Lemnoideae)
Authors: Ramírez-Babativa Daniel Ferley 
Published: July 2019

Lemna minuta es una macrófita flotante de amplia distribución en ecosistemas lénticos, que puede ser útil en el desarrollo de ex-perimentos ecofisiológicos y ecotoxicológicos debido a su potencial sensibilidad a contaminantes acuáticos como toxinas y meta-les pesados. Para estos, inicialmente se deben establecer cultivos axénicos con sus poblaciones bajo condiciones de laboratorio,los cuales requieren técnicas de limpieza para sus frondas que aún no han sido definidas. Se adaptó el método de Acreman en su tiempo de exposición y concentración de hipoclorito de sodio, propuesto para la desinfección de las especies pertenecientes al género LemnaL. (Lemnoideae) a partir de colonias nativas. Las colonias se obtuvieron de un humedal de la ciudad de Bogotá, y posteriormente se aclimataron y desinfectaron en diferentes tiempos y soluciones de hipoclorito. Los resultados más adecuadospara la remoción de algas epífitas y otros microrganismos de las frondas, sin presentar alta mortalidad de las colonias, se obtuvie-ron, respectivamente, en las concentraciones 0,5% (45 y 30segundos) y 0,25% (60segundos) de hipoclorito. Por el contrario, el tiempo de exposición de 60segundos propuesto por el método Acreman (0,5%) resultó en la mortalidad total de las frondas (100%). Se sugiere utilizar una solución de hipoclorito de sodio 0,5% en un tiempo de exposición menor o igual a 45 segundos para la desinfección de colonias de L. minutacon fines experimentales.
Tolerancia al plomo de aislamientos nativos de Pseudomonas spp. de aguas residuales del Valle de Aburrá
Authors: Bedoya Vélez Jessica María , Castaño Gustavo , Ochoa Agudelo Susana 
Published: July 2019

El plomo (Pb) es un metal pesado cuyas características físico-químicas lo convierten en un contaminante ambiental persistente, bioacumulable y de alta toxicidad. La biorremediación surge como una alternativa con múltiples ventajas en comparación con los tratamientos convencionales para remover contaminantes como metales pesados de aguas residuales, basándose en las capacida-des de tolerancia y mecanismos de resistencia de los microorganismos. Con el fin de conocer la tolerancia de Pseudomonasspp. al plomo presente en aguas contaminadas, se obtuvieron cuatro aislados nativos, procedentes de aguas residuales colectadas en elrío del Valle de Aburrá (zona norte), los cuales se caracterizaron bioquímicamente. Se realizaron bioensayos de tolerancia en diferen-tes concentraciones de plomo por difusión en agar, como prueba tamiz, y determinación de la concentración mínima inhibitoria,determinando la viabilidad del microorganismo en cada exposición. No se presentó diferencia significativa para la tolerancia al plo-mo entre los aislados, identificados bioquímicamente como Pseudomonas aeruginosa, ni entre las diferentes concentraciones de plomo a las cuales fueron expuestos los aislados. A partir de estos resultados, se discute a cerca de los mecanismos reportados por diferentes autores, mediante los cuales Pseudomonasspp. puede actuar en presencia de Plomo. De esta manera, se concluye que los aislados de Pseudomonasspp. presentan mecanismos de tolerancia y/o resistencia hasta concentraciones de 2500 mg/L en presencia de nitrato de plomo, como potenciales agentes que pueden integrarse en procesos que impulsan nuevas tecnologías de biorremediación.
Biotechnological valorization of agro industrial and household wastes for lactic acid production
Authors: Romo-Buchelly Juliana , Rodríguez-Torres María , Orozco-Sánchez Fernando 
Published: July 2019

Lactic acid (LA) is an organic compound used in several industries, such as food, textile, chemical, and pharmaceutical. The global interest in this product is due to its use for the synthesis of numerous chemical compounds, including polylactic acid, a biode-gradable thermoplastic and substitute for petroleum-derived plastics. An in-depth overview of the use of industrial and household wastes as inexpensive substrates in order to reduce the cost of LA production is presented. A review is carried out of the biotech-nological aspects that must be taken into account when using some wastes with high transformation potential to produce LA in a submerged culture, as well recommendations for their use. The advantages and disadvantages of different types of treatments used for the transformation of waste into suitable substrates are considered. Several methods of fermentation, as well as genetic strategies for increasing the production, are summarized and compared. It is expected that in a few years there will be many ad-vances in these areas that will allow greater large-scale production of LA using agroindustrial or household wastes, with potential positive economic and environmental impact in some regions of the planet.
Expresión génica de ligandos mica, micb y ulbp (1-6) del receptor NKG2D de células natural killer y metaloproteinasas adam10, adam17 y mmp14 en lineas celulares de cancer de cervical
Authors: García Dabeiba Adriana , Pérez Pilar , García Laura , Cid-Arregui Angel , Aristizabal Fabio 
Published: July 2019

El CCU es la segunda causa de muerte en mujeres de nuestro país. Dentro de los primeros mecanismos de defensa del hospedero se encuentra la respuesta inmune de las células NK y su función lítica a expensas de su receptor activador NKG2D, el cual posee como ligandos mica, micb y ulbp (1-6), los cuales se expresan en células transformadas y/o infectadas por virus. Uno de los mecanismos de evasión por parte de la célula tumoral es el clivaje de estas proteínas a través de metaloproteinasas como adam10, adam17 y mmp14. Se analizó la expresión de estos ligandos y metaloproteinasas mediante PCR tiempo real, en lineas celulares de referencia para cáncer cervical como HeLa (positiva para VPH-18) y C33A (negativa para VPH). Se obtuvieron valores representativos de expresion relativa genica con diferencias significativas asi: mmp14 en linea HeLa (p= 0.006); y mica y ulbp-3 en la linea C33A (p= 0.020 y p=0.003 respectivamente). Por lo tanto, se podría sugerir que la expresión de mmp14 se encuentran posiblemente involucrados con la presencia de VPH causante del cancer cervical y la respuesta inmunne innata desarrollada.
Luther’s ‘Metaphysics’ in Heidegger’s Beiträge
Authors: Armitage Duane 
Published: July 2019

This essay argues that Luther’s “metaphysics” is present in Heidegger’s Beiträge zur Philosophie (Contributions to Philosophy), a text many consider to be Heidegger’s second magnum opus. I argue that Luther’s “metaphysics” is present in Heidegger’s Contributions in primarily two ways: (1) there is a Lutheran structure (of existential categories) that Heidegger appropriated not only in Being and Time, but also much earlier in his lectures on St. Paul from the 1920s, of responding to a call and converting in anxious anticipation toward a futural not-yet (what Heidegger calls “the last god”); and (2) Contributions’ project concerns overcoming metaphysics, which involves first thinking through to metaphysics’ conditions for possibility, which means recognizing the “ironic nature” of beyng via what Heidegger calls “thinking concealment,” the logic of which originates in Luther’s attacks on not only Greek metaphysics, but upon Judaism and the Mosaic law as well.
Engineering and Economics Graduates: Between Demand and Supply
Authors: Varshavskaya Elena , Kotyrlo Elena 
Published: July 2019

Microdata from the National Employment Survey of 2010–2015 Vocational and University Graduates conducted by the Russian Federal State Statistics Service (Rosstat) in April–September 2016 is used to analyze the study-to-work transition of graduates in engineering and economics. Transition effectiveness is used to estimate the ratio of demand and supply of graduates’ labor. Research methods include descriptive and regression analysis.
Statistical analysis of macro data shows that the number of skilled engineers who obtained degrees in 1990–2000 exceeded the number of engineers exiting the labor force upon reaching the age of retirement during that period. While aggregate supply of engineering workforce was growing during the post-reform era, demand for their labor was shrinking―mostly due to a considerable decline in industrial jobs.
It has been established that chances of getting a job, average time that it takes to find one, and the degree of first-job educational and skill match are pretty much the same for young qualified engineers and economists. No statistically significant difference has been observed between their starting salaries, either. Therefore, no evidence has been found to support the hypothesis about a high unmet demand for qualified engineers and surplus of workforce in economics and management. The study demonstrates that the reported shortage of engineers has nothing to do with low aggregate supply. Research findings could be used in the design of academic programs for higher education at national and regional scales.
BUDAYA ORGANISASI DAN MOTIVASI SEBAGAI PREDIKTOR KINERJA GURU SEKOLAH MENENGAH KEJURUAN
Authors: Mahmudah Ai Noer Millah , Sarino Alit 
Published: July 2019

Penelitian ini bertujuan untuk menganalisis pengaruh budaya organisasi dan motivasi terhadap kinerja guru dengan menggunakan metode survey explanatory. Teknik pengumpulan data menggunakan angket dengan skor yang terentang antara 1 sampai 5 model rating scale. Responden adalah guru Sekolah Menengah Kejuruan di Kota Bandung. Teknik analisis data menggunakan regresi. Hasil penelitian diperoleh bahwa budaya organisasi di sekolah dan motivasi memiliki pengaruh yang positif dan signifikan terhadap kinerja guru, baik secara parsial maupun simultan. Oleh karena itu, kinerja guru dapat ditingkatkan melalui peningkatan budaya organisasi dan motivasi. Implikasinya adalah adanya kebutuhan untuk Kepala Sekolah atau pemimpin lainnya dalam mengambil tindakan yang berkaitan dengan peningkatan kinerja guru.Kata Kunci: kinerja guru, budaya organisasi, motivasi ORGANIZATIONAL CULTURE AND MOTIVATION AS PREDICTORS OF TEACHER PERFORMANCE AT VOCATIONAL HIGH SCHOOLThe purpose of this study was to analyze influence organizational culture and motivation to teacher performance. This research used survey method. Data collection techniques used question model on scale of 1-5 form with rating scale. Respondents are teacher of Vocational High School in Bandung. Data were analyzed using regression. The result of the study revealed organizational culture and motivation both partially and simultaneously, has the positive and significant influence toward teacher performance. Thus the teacher's performance can be improved through increased organizational culture and motivation. The implication is a need for the principal or other leaders in taking actions related to the improvement of teacher performance.Keywords: teacher performance, organizational culture, motivation
PENGARUH MODEL PEMBELAJARAN DISCOVERY LEARNING DAN PROBLEM BASED LEARNING TERHADAP PRESTASI BELAJAR PESERTA DIDIK
Authors: Suminar Serra Oktafoura , Meilani Rini Intansari 
Published: July 2019

Model pembelajaran adalah salah satu faktor yang mempengaruhi prestasi belajar peserta didik di kelas. Artikel ini membahas hasil penelitian kuasi eksperimen yang ditujukan untuk mengetahui pengaruh model pembelajaran Discovery Learning dan model pembelajaran Problem Based Learning terhadap prestasi belajar 70 orang peserta didik sebuah SMK, pada Mata Pelajaran Korespondensi, kompetensi dasar mengidentifikasi prosedur pembuatan surat dinas. Dengan menggunakan non-equivalent control group design, hasil analisa data menunjukkan bahwa model pembelajaran Discovery Learning lebih cocok dalam meningkatkan prestasi belajar peserta didik dalam mempelajari kompetensi dasar mengidentifikasi prosedur pembuatan surat dinas, dibandingkan model pembelajaran Problem Based Learning. Dengan demikian, model pembelajaran Discovery Learning dapat menjadi salah satu alternatif bagi para guru Mata Pelajaran Korespondensi dalam meningkatkan prestasi belajar peserta didik pada mata pelajaran tersebut.Kata Kunci: Discovery Learning, Problem Based Learning, Prestasi Belajar THE INFLUENCE OF DISCOVERY LEARNING AND PROBLEM BASED LEARNING MODELS ON STUDENTS’ LEARNING ACHIEVEMENTTeaching and learning model is one of the factors influencing students’ learning achievements. This article discusses results of a quasi-experimental study which aims to investigate the influence of discovery learning and problem-based learning models on learning achievements of 70 vocational high school students, in the subject of Correspondence (in the competence of identifying the procedure of writing official letters). Using non-equivalent control group design, results of data analysis show that discovery learning model is more suitable to improve students’ learning achievements in the competence of identifying the procedure of writing official letters, compared to problem based learning model. Thus, discovery learning is worth using by teachers of the subject to improve the learning achievements of their students in this subject. Keywords: Discovery Learning, Problem Based Learning, Learning Achievement
PERAN KECERDASAN EMOSIONAL SEBAGAI FAKTOR YANG MEMPENGARUHI KEMANDIRIAN BELAJAR SISWA
Authors: Afero Baghdad , Adman Adman 
Published: July 2019

Penelitian ini bertujuan untuk menganalisis pengaruh kecerdasan emosional terhadap kemandirian belajar siswa. Metode penelitian menggunakan metode survey eksplanasi. Teknik pengumpulan data menggunakan wawancara dan angket (kuesioner) dengan model skala likert. Penelitian ini menggunakan pendekatan kuantitatif dengan responden adalah siswa salah satu Sekolah Menengah Kejuruan di Kota Cimahi sebanyak 264 orang didapat dari teknik pengambilan sampel jenis sampel acak sederhana (random sampling). Teknik analisis data menggunakan regresi sederhana. Hasil penelitian menunjukan kecerdasan emosional memiliki pengaruh yang positif dan signifikan terhadap kemandirian belajar siswa. Adapun pengaruh kecerdasan emosional terhadap kemandirian belajar siswa sebesar 21,85%. Dengan demikian kemandirian belajar siswa dapat ditingkatkan melalui peningkatan kecerdasan emosional.Kata Kunci: kecerdasan emosional, kemandirian belajarTHE ROLE OF EMOTIONAL INTELLIGENCE AS A FACTOR IN AFFECTING STUDENT INDEPENDENCE LEARNINGThe purpose of this study was to analyze influence emotional intelligence to independent learning. This research used explanatory survey method. Data collection techniques used interviews and question form with likert scale model. This study used a quantitative approach, the respondents were students of Vocational High School in Cimahi as many as 264 people obtained from random sampling. The analysis technique was simple regression. The result of the study revealed that emotional intelligence has a positive effect and it has significant impact on student learning independence. The contribution of emotional intelligence to independent learning were students is 21,85%. Thus the independent learning can be improved through increased emotional intelligent.Keywords: emotional intelligence, independence learning
UPAYA MENINGKATKAN KOMITMEN ORGANISASI MELALUI PERILAKU KEPEMIMPINAN
Authors: Ananda Susi , Winata Hendri 
Published: July 2019

This article aims to discuss the results of his research on the influence behavior against the commitment of the leadership of the organization in one of educational institutions in the city of bandung. A method of this research using methods explanasi survey, as the proportion of respondents as many as 57 people employees. The result analysis of the data indicate that the percentage the effectiveness of our leadership behavior was a little, and the percentage level employees komiten organization is also small. Nevertheless, behavior having influence leadership a positive and significantly to the commitment of the organization. To increase the commitment of the organization, then needs to be improved the effectiveness of our behavior leadership.ABSTRAKArtikel ini bertujuan untuk memaparkan hasil penelitian tentang pengaruh perilaku kepemimpinan terhadap komitmen organisasi di salah satu Institusi Pendidikan di Kota Bandung. Metode penelitian ini menggunakan metode survey explanasi, dengan responden sebanyak 57 orang pegawai. Hasil analisa data menunjukkan bahwa presentase efektifitas perilaku kepemimpinan masih rendah, dan presentase tingkat komiten organisasi pegawai juga rendah. Namun demikian, perilaku kepemimpinan memiliki pengaruh yang positif dan signifikan terhadap komitmen organisasi. Untuk meningkatkan komitmen organisasi, maka perlu ditingkatkan efektifitas perilaku kepemimpinan.
KETERAMPILAN MANAJERIAL KEPALA SEKOLAH DAN BUDAYA MUTU SEBAGAI DETERMINAN KINERJA
Authors: Sarifani Kaisya Azzahra Kadar , Rasto Rasto 
Published: July 2019

The purpose of this study was to analyze the influence of principal’s managerial skills and quality culture on teacher performance. The research method used survey method. Data collection techniques used a rating scale scale questionnaire with scores ranging from 1 to 5. Respondents are 90 teachers of State Vocational High School in Bandung. Data analysis technique using regression. The results showed that job satisfaction and organizational commitment have a positive and significant influence on teacher performance, either partially or simultaneously. Thus the performance of teachers can be improved through improving the principal's managerial skills and quality culture.ABSTRAKPenelitian ini bertujuan untuk menganalisis pengaruh keterampilan manajerial kepala sekolah dan budaya mutu terhadap kinerja guru. Metode penelitian menggunakan metode survey. Teknik pengumpulan data menggunakan angket model rating scale dengan skor yang terentang antara 1 sampai dengan 5. Responden adalah 90 guru Sekolah Menengah Kejuruan Negeri di Kota Bandung. Teknik analisis data menggunakan regresi. Hasil penelitian menunjukkan kepuasan kerja dan komitmen organisasi memiliki pengaruh yang positif dan signifikan terhadap kinerja guru, baik secara parsial maupun secara simultan. Dengan demikian kinerja guru dapat ditingkatkan melalui peningkatan keterampilan manajerial kepala sekolah dan budaya mutu