bluuebunny/crossref_metadata_2025 huggingface dataset:
Representaciones sociales del tratamiento penitenciario en población reclusa y en servidores penitenciarios
Authors: Ruiz Pérez Jose Ignacio , Malaver Pérez Ivonne Magaly , Romero-González Paola Andrea , López Cantero Ever José , Silva Beltrán Myriam
Published: September 2018

El tratamiento penitenciario forma parte de las políticas penitenciarias dirigidas a la resocialización en un marco garantista de los derechos de los detenidos. El objetivo de este trabajo fue conocer las representaciones sociales deltratamiento penitenciario en internos/as y servidores penitenciarios, de once establecimientos penales colombianos, en el año 2011. Un cuestionario basado en la asociación libre de palabras fue respondido por una muestra no aleatoriade 485 funcionarios/as penitenciarios/as y de 1240 personas privadas de libertad. Para llevar a cabo el tratamiento penitenciario en ambos grupos se asoció, sobre todo, con la resocialización y con las modalidades en las que hace énfasis la ley penitenciaria en Colombia y cuya realización permite descuento de la condena: trabajo, educación y estudio. Mediante un análisis de clasificación jerárquica se halló entre los internos/as varios campos de representación sobre aspectos críticos del tratamiento penitenciario, como «miedo», «aislamiento» o que es «inexistente»; mientras que los funcionarios emplearon con más frecuencia términos como «resocialización», «bienestar» o «seguimiento». En ambos grupos predominó una representación social positiva del tratamiento penitenciario.
Evaluación de un modelo sociocognitivo de autoeficacia, burnout y engagement en el trabajo: análisis de invarianza entre Argentina y España
Authors: Spontón Carlos , Castellano Estanislao Joaquín , Salanova Marisa , Llorens Susana , Maffei Luis , Medrano Leonardo
Published: September 2018

Basado en la “teoría cognitiva social”, el objetivo del presente trabajo es poner a prueba la invarianza estructural de un modelo sociocognitivo en donde la autoeficacia profesional desempeña un rol predictor del burnout y del engagement en el trabajo, en dos muestras independientes y heterogéneas de trabajadores españoles (N =1.406) y argentinos (N =687). Se realizó un estudio ex post facto prospectivo utilizando ecuaciones estructurales (SEM) y análisis multivariante de la varianza (MANOVA) para analizar la invarianza del modelo y determinar si existen diferencias en las variables estudiadas en función del país. Los resultados de SEM y MANOVA muestran que: a) luego de incorporaralgunas re-especificaciones al modelo de relaciones de la autoeficacia, burnout y engagement, este es invariante en las dos muestras (χ² = 209.61, gl = 16, p<.001, CFI = .94, IFI = .94, TLI = .94 RMSEA = .07); b) la autoeficacia profesional tiene una influencia negativa sobre el corazón del burnout (β Argentina = -.25 y β España = -.22, p < .001) y positiva con el corazón del engagement (β Argentina = .34 y β España = .41, p < .001), y c) existen diferencias significativas en función del país, mostrando en los trabajadores argentinos puntuaciones significativamente más altas en autoeficacia (F=107.13, p<.001). Los resultados corroboran la importancia de las creencias de autoeficacia sobre el burnout y engagement tanto en Argentina como en España.
Ansiedad, depresión, estrés y apoyo social percibido en el proceso de hospitalización de la Sociedad de Cirugía Hospital de San José de la ciudad de Bogotá-Colombia
Authors: Preciado Duarte Nidia Yineth , Trujillo Madrigal Daniela , Rojas Espitia Hector Fabio
Published: September 2018

Se determinó la presencia de ansiedad, depresión, estrés y apoyo social percibidos en el proceso de hospitalización, en una muestra probabilística de 232 personas, con un protocolo que incluyó entrevista semiestructurada, inventario de depresión de Beck (BDI), Escala de ansiedad y depresión hospitalaria (HADS) (subescala de ansiedad), entrevista de apoyo social basada en la escala de Zimet y Escala de estrés percibido (PSS-14). Los resultados indican presencia dedepresión en el 55% y de ansiedad en el 16% de los participantes, estrés percibido en promedio de 24.50 DE: 7.45 y mayor apoyo social percibido por parte de personas significativas y familiares. En relación con las variables sociodemográficas, se encontró mayor depresión en los adultos tardíos de sexo masculino, en unión libre y con estancia hospitalaria larga. La ansiedad y el estrés percibido fueron superiores en las mujeres solteras con estancia hospitalaria corta. El apoyo social percibido fue menor en los adultos de sexo masculino, casados y con estancia hospitalaria media. Se concluyó que es fundamental profundizar en la relación de las variables estudiadas para su correcto y oportuno tratamiento con un enfoque biopsicosocial, lo que es coherente con reportes de la literatura.
Ciberacoso en una muestra de adolescentes de instituciones educativas de Bucaramanga
Authors: Redondo Pacheco Jesus , Luzardo Briceño Marianela , Inglés Saura Cándido José , Rivas Rivero Esther
Published: September 2018

Hoy en día las formas de comunicación han cambiado debido a la rápida evolución de las nuevas tecnologías, que se han constituido como una herramienta persuasiva, útil e incluso fundamental, pero que también ha llevado a que se ejecute una violencia de tipo simbólica en niños, niñas y adolescentes. En Colombia el fenómeno del ciberacoso ha sido poco estudiado, por lo que el objetivo del presente estudio fue analizar y describir la incidencia del acoso a través de las nuevas tecnologías de la información y la comunicación, examinando las posibles diferencias que se pueden presentar respecto al grado educativo. La muestra estuvo constituida por 1080 estudiantes adolescentes de cuatro colegios de Bucaramanga (Colombia) y su zona metropolitana (hombres N = 437, mujeres N = 643). Los resultados indicaron que el 17.4% y el 21.8% (por medio del celular y del internet, respectivamente) de los participantes hansido víctimas de ciberacoso por lo menos en una ocasión, en un lapso de tiempo menor o igual a 1 mes, en gran parte de los casos. Además, los resultados indicaron que, en lo que respecta al teléfono celular, no se encontraron diferencias significativas en la presentación del ciberacoso según los grados educativos estudiados, mientras que, en cuanto a internet, las únicas diferencias encontradas tienen que ver con el hostigamiento en el grado sexto y la violación de la intimidad en el grado décimo.
Synthesis and Characterization of Super Paramagnetic Iron Oxide Nanoparticles
Authors: Aich Debasish , Samanta Pijus Kanti , Saha Satyajit , Kamilya Tapanendu
Published: September 2018

Background:

Iron oxide (γ-Fe2O3) nanoparticles have been prepared by a simplified coprecipitation
method.

Methods:

X-ray diffraction peaks of the prepared nanoparticles match well with the characteristic
peaks of crystalline g-Fe2O3 as per JCPDS data (JCPDS Card No. 39-1346) and absorption peak at
369 nm along with band gap 2.10 eV suggesting the formation of (γ-Fe2O3) nanoparticles.

Results:

The γ-Fe2O3 nanoparticles are spherical in nature with a diameter around ~10 nm.

Conclusion:

The crystalline g-Fe2O3 nanoparticles exhibit excellent super-paramagnetic behavior
not only at room temperature (300K) but also at a temperature as low as 100K.
Local Political Democratization Policy: Voter Participation in the Direct Regional Head Elections
Authors: Winengan Winengan
Published: September 2018

The regional head election, a local political event and a symbol of democratic government, is a contest for a legitimized power of regional leaders, who are given authority and responsibility to administer and lead the regional apparatus and development. Since the Indonesian reformation era, the policy regarding the regional head election has shifted from being elected by the local legislative assembly (representative system) to being elected by the people directly (direct election). Anchored in the quantitative descriptive research design, in which the data was garnered from documentation, this study aims to examine the extent to which the people partook in the first round of the direct and simultaneous regional head election in 2015. The collected data was analyzed by means of the participatory and democracy approach within the local political landscape. The empirical findings showed that the public participation in the local election remained low given the statistical evidence (64.02% of the total voters). The study demonstrates that despite the provision of the political stage within the local scope, it does not fully encourage the people to exercise their political rights.
Bridging Indonesia’s Digital Divide: Rural-Urban Linkages?
Authors: Hadi Aulia
Published: September 2018

While Indonesia is recorded as one of the greatest social media republics in the world, the gap of rural-urban internet access remains a great challenge. As reported in the 2016 Information and Communication Technology (ICT) Indicators, the number of households with internet access in rural areas is nearly half of those in urban areas; 26.3% and 48.5% in a consecutive way. Rather than simply seeing the internet as a medium, this paper discusses the internet as material culture; therefore, it goes beyond the access and focuses on the ways people use the internet to define their culture. From this perspective, this paper draws the two levels of the digital divide of Indonesian rural-urban dwellers. Lack of motivation and limited material access due to social inequality is at the very base of the digital divide. Subsequently, digital skills and usage deepen the digital divide. While splitting people into either rural or urban categories often produces misleading policies, this paper proposes the rural-urban linkages to bridge the digital divide in Indonesia. The rural-urban linkages particularly incorporate the flow of people and information across space as well as the interconnection between sectors, such as agriculture and service.
Subaltern, Politik Etis, dan Hegemoni dalam Perspektif Spivak
Authors: Setiawan Rahmat
Published: September 2018

Istilah subaltern merujuk pada populasi yang secara sosial, politik, dan geografis ditundukkan oleh suatu kelompok yang menguasai mereka. Dari sana kita memahami bahwa selalu ada praktik hegemonik dalam diskusi subaltern yang mana suara mereka selalu dimanipulasi secara etis sebagai bagian dari praktik politik suatu kelompok untuk mendominasi. Itu mengapa kelompok subaltern merupakan alat dari suatu praktik hegemonik yang melambangkan dominasi politik, militer, sosial, dan bahkan kultural oleh suatu kelompok di atas kelompok lainnya. Karena hegemoni bersifat tak langsung, maka praktik ini biasanya dioperasikan melalui hal-hal yang bersifat ideologi dan cenderung etis terhadap kelompok yang akan dikuasai, dan dalam kajian teoretis Spivak, kelompok subaltern adalah kelompok yang suaranya selalu direpresentasikan, sementara representasi hanyalah alat untuk menuju dominasi nyata. Oleh karena itu, topik mengenai subaltern adalah mengenai bentuk praktik politik etis kelompok hegemon terhadap kelompok subaltern yang menjelaskan adanya hegemoni yang bertopeng. Kata Kunci: Subaltern, Politik Etis, Hegemoni, dan Spivak.
Pemaknaan dan Transmisi Mantra Tri Sandhya Pada Remaja Hindu Bali Di Daerah Malang
Authors: Candra Khairul , Noviyanti Luh Putu Ema , Nurlaily Kiky
Published: September 2018

Tulisan ini mengulas makna dan transmisi mantra Tri sandhya. Mantra Tri Sandhyamerupakan salah satu bentuk sastra lisan yang ada di Bali. Mantra Tri Sandhya merupakan mantra yang dimiliki oleh orang Hindu Bali yang dalam kehidupan sehari-hari. Pada saat ini, mantra Tri Sandya mulai dilupakan dan jarang oleh remaja Hindu Bali. Berdasarkan latar belakang tersebut, penelitian ini dilakukan untuk (1) membaca makna mantra Tri Sandhya: (2) mantra transmisi Tri Sandhya pada remaja Hindu Bali yang tinggal di Malang. Metode yang digunakan dalam penelitian ini adalah metode deskriptif kualitatif. Metode yang digunakan dalam penelitian ini untuk mengambil data dalam bentuk kalimat bukan angka-angka. Sumber data dari penelitian ini adalah Mantra Tri Sandhya. Penelitian ini menggunakan pendekatan Semiotika dengan teori Riffaterre. Semiotika untuk mengkaji tanda-tanda yang ada dalam mantra, Tri Sandhya, dapat dipahami makna dari mantra Tri Sandhya. Hasil penelitian ini menunjukkan bahwa mantra makna Tri Sandhya dan mantra transmisi Tri Sandhya pada remaja Hindu Bali di wilayah Malang saat ini.
Pengaruh Aspek Sosio-Kultural Masyarakat Loloan terhadap Struktur dan Makna Syair Burdah Melayu di Bali
Authors: Mabruri M. Alan , Maulidya Riesta , Sugiatmi Fitria
Published: September 2018

Syair Burdah Melayu merupakan bentuk tradisi lisan yang saat ini masih terlestari. Syair Burdah Melayu tercipta karena terjadi akulturasi budaya masyarakat pendatang di Loloan, Bali. Perpaduan antara budaya pendatang membentuk absurditas dalam struktur Syair Burdah Melayu. Penelitian ini bertujuan mendeskripsikan makna dan bentuk syair Burdah Melayu Loloan dengan aspek sosio-kultur yang mempengaruhinya. Masalah yang dianalisis adalah makna dan variasi bentuk pada syair Burdah Melayu. Teori yang digunakan adalah teori strukturalisme dinamik oleh Mukarovsky dan Vodicka dikombinasikan dengan teori semiotik oleh Charles Sander Pierce untuk menjelaskan makna dan bentuk syair Burdah Melayu yang dipengaruhi oleh sosio-kultur masyarakat Loloan Barat. Jenis penelitian adalah kualitatif dengan menggunakan kata-kata untuk mendiskripsikan hasil analisis puisi. Dari hasil analisis diketahui bahwa bentuk Syair Burdah Melayu dipengaruhi oleh unsur budaya lain seperti Arab, Jawa, dan Melayu sehingga bentuk Syair ini seolah terpisah tapi sebenarnya satu kesatuan utuh.
PENENTUAN LOKASI TEMPAT EVAKUASI AKHIR PENGUNGSI PADA ANCAMAN BENCANA TSUNAMI KOTA PADANG
Authors: Fijra Rafiqa
Published: September 2018

Padang is capital city of West Sumatera whose coastal layout and approximately 50% of population live in low area. It opposites to the Indian Ocean which near the Megathrust subduction which can trigger a powerful earthquake and generate tsunami. Because of the potential risk, important to finding the final evacuated region (TEA) location addressed by evacuee of each affected village, and defining the evacuee population and its susceptive population on each TEA. Defining the location TEA is provided by formulating the linear programming model which minimizing the total traveled distance. Then, defining of population and susceptive of evacuee in each TEA also analyzed to support the response disaster occurred. The optimization model is conducted in three level scenarios of tsunami scale, that are big, medium, and small .
KINERJA KOLEKTOR TIPE PLAT DATAR PADA MESIN PENDINGIN ADSORPSI TENAGA SURYA DI KOTA MEDAN
Authors: Sitorus Tulus Burhanuddin
Published: September 2018

The performance of a flat plate collector on adsorption refrigerator driven by the solar collector was investigated in the present work. Based on a study conducted no researcher studies the performance of solar collectors used in adsorption cooling system. The adsorbent used in the collector was 20 kg ordinary powder activated carbon of coconut shell produced in the Sumatera Utara province of Indonesia, 5 liters of methanol as adsorbate and 6 liters of water as the medium that was cooled. The experiments were carried out under varying weather conditions with total solar radiation about 12619-17807 kJ/m2/cycle in Medan city. The experimental results show that the values of collector efficiency obtained were about 52.11-53.92%. The values of coefficient of performance (COP) obtained were in the range of 0.0318-0.0449. The results of the statistical study suggest that the effect of the weather conditions on collector efficiency thereabout 96%.
APLIKASI STRUCTURAL EQUATION MODELLING (SEM) PADA KAJIAN PENGARUH KELEMBAGAAN, MODAL SOSIAL JIWA KEWIRAUSAHAAN TERHADAP KINERJA USAHA BUDIDAYA IKAN NILA DI KABUPATEN SLEMAN
Authors: Mulyaningtiyas Ratna Dewi
Published: September 2018

Social capital becomes the main capital that must be owned by an entrepreneur, thus increasing the entrepreneurial spirit. The purpose of this research is to know the institutional condition of the members of the group of tilapia fish farm, the social capital of the member of the cultivation group of tilapia, the entrepreneurial spirit, farm performance of the tilapia fishery group, and the institutional influence, social capital, entrepreneurial spirit to the business performance of the nila fish farming group in Sleman District. The method used in this research is a method of a mixed method, with 150 responders and analyzed with SEM. The results showed that more than 50% of institutional conditions, social capital, entrepreneurial spirit, and business performance of tilapia fish farming group members of beginners, middle, and main in Ngemplak and Cangkringan Subdistrict Sleman Regency has a high category. There is no significant institutional influence on the influence of social capital on the entrepreneurial. Institutional is not a moderator variable between social capital relations and entrepreneurial spirit. This indicates that the higher/ lower institutional will not result in changes the higher/ lower the influence of social capital on entrepreneurial.
PENGARUH PENAMBAHAN IRON MILL-SCALE DAN TEMBAGA SEBAGAI MATERIAL PELAT BIPOLAR
Authors: Ulmiah Nisya , Arsyad Fitri Suryani , Khaerudini Deni Shidqi
Published: September 2018

Bipolar plate is an important component of proton exchange membrane fuel cell (PEMFC), which provides fuel and oxidant to reactive sites, collect produced current, and mechanical support for the cell in the stacks. This study concerns to find the optimum composition and sintering temperature of iron mills-cale in matrix aluminium as bipolar plate material. This work firstly carried out by downsizing aluminium flake from scrap into powder using high energy milling for 120 min and treated the iron mill-scale at 300 and 1000 oC for 60 min. The waste aluminium powder, after sieving of 150 mesh, was mixing with iron mill-scale containing 30 to 50 vol.% using shaker mill for 10 min. The mixed powders were then pressed 300 MPa and sintered with temperature of 500-600 oC for 60 min and flowed with N2 gas. The structural changes, physical, and mechanical properties of the sintered sample were studied by optical micrograph, density, porosity, hardness Vickers, and electrical conductivity test. The result showed that the optimum composition Fe is 40 vol. % and sinter temperature is 550 oC. Conductivity value of 45.406 S/cm and hardness 183.96 HV hasn’t meet expectation. Cu added containing 4-10 vol. % Fe aims to improve physical properties composites as bipolar plate material PEMFC. The result showed Cu 4 vol. % Fe can increase conductivity value 64.481 S/cm and hardness 340.13 HV.
CLINICAL DECISION SUPPORT SYSTEMS THEORY AND PRACTICE
Authors: Wiharto Wiharto
Published: September 2018

Clinical Decision Support Systems Theory and Practice, adalah buku teks dalam seri Health Informatics yang membahas tentang sistem pendukung keputusan klinis. Pada buku ini terbagi menjadi dua kelompok bahasan, Pertama membahas tentang dasar dalam mengembangkan sistem Clinical Decision Supprot System (CDSS) dan evaluasinya. Kedua, Aplikasi CDSS dalam praktik klinis. Bahasan tersebut menjadikan pembaca dapat memperoleh gambaran tentang dasar-dasar yang diperlukan dalam membangun dan mengaplikasikan CDSS dalam praktik klinis. Secara rinci buku tersebut terbagi menjadi 11 Bab, yang dapat dikelompokkan menjadi 7 Bab tentang konsep dalam pengembangan CDSS, dan 4 Bab tentang aplikasi CDSS dalam praktik klinis.
مواقف ابن قدامة تجاه آراء المعتزلة الأصولية من خلال كتاب روضة الناظر وجنة المناظر
Authors: Apriantoro Muhamad Subhi , Basri Muhammad Muinudinillah
Published: September 2018

This publication discusses the thought of ushul fiqh Mu’tazilah in the book of Raudhot an-Nadzir wa Jannat al-Manadzir written by Ibnu Qudamah. The book is the summary of Al Mustashfa written by Imam Al Ghozali. Al Mustasfha contains diction which is not easily understood. It relates with the method used by Imam Al Ghazali namely method of Al-Mutakallimin. Therefore, book of Raudhot an-Nadzir wa Jannat al-Manadzir discusses the thought of ushul fiqh Mu’tazilah. The method of the research was qualitative method. It can be identified that Ibnu Qudamah adopts the thought of Al Ghozali without putting down his name in his book. In this book, Ibnu Qudamah sometimes has the same and different opinion with Al Ghozali. However, they also have same thought with different sampling cases. The thought of ushul fiqh Mu’tazilah influences the method of contemporary ushul fiqh. One of the influences is a human freedom to do ijtihad with the right to create their own fate. There is also a difference between old and new Mu’tazilah.  In the old perspective, the law consideration is about God (theocentric). Meanwhile, in the new perspective, the law consideration is about human (anthropocentric) يبحث في هذه النشرة عن آراء المعتزلة الأصولية التي أوردتها ابن قدامة خلال كتابه روضة الناظر وجنة المناظر لما كان هذا الكتاب مختصرا من كتاب المستصفى في علم الأصول لأبي حامد الغزالي فقد عرض كثير من عبارته بغموض وإبهام. هذا لا يخرج عن كون الغزالي نهج منهج المتكلمين في كتابة المستصفى. لهذا قد تميز روضة الناظر بآراء المعتزلة الأصولية. سلك الباحث منهج كيفي تبين من البحث أن ابن قدامة مهما كان أخذ كثير من آراء الغزالي في كتابه، وهو لم يذكر اسم الغزالي قط خلال كتابه، وافق الغزالي تارة وخالفه تارة، أو وافقه في المعنى وخالفه في الأمثلة. وآراء المعتزلة الأصولية لها تأثير كبير في مناهج الأصولية المعاصرة، منها أن باب الاجتهاد فتح بشكل واسع للحرية الأفعال الإنسانية، وجود الفروق بين مبنى الفكرة المعتزلة القدماء بمن يدعى أنه المعتزلة بثوبها الجديد. أن المعتزلة القدماء يجعلون الإله محور كل شيء، أما المعتزلة المعاصرة فإنهم جعلوا الإنسان محور كل شيء.
Teacher' attitudes towards e-learning in higher education in Macedonia Case study: University of Tetovo
Authors: Xhaferi Gazmend , Farizi Arta , Bahiti Rovena
Published: September 2018

Nowadays in higher education it is important integration of new information and communication technologies into the learning and teaching process. Fastest development of computer technologies and the Internet as a communication platform has motivated higher education institutions to start to think about integration of e-learning system on teaching and learning process on their university. E-learning is becoming progressively more important in higher education environment. Teacher is one of the most important stockholder for integration of e-learning. The purpose of this paper is to analyze the perception of teachers' attitudes towards e-learning. In this study were analyzed 49 teachers teaching in 2 major faculties in University of Tetovo, in Macedonia. The results show that a significant number of teachers agree about the plan to blend the present teaching method with e-learning, on the other hand, a great number of teachers not agree to replace traditional teaching method with e-learning. The results show that the number that prefer using traditional teaching method is the same with those that not agree.Â  There is no any significant correlation between teacher' attitudes towards various e-learning according to gender and faculty. Results shows that teachers' attitudes have important role towards e-learning in teaching process. These results can be a good example for creation a platform or framework for the implementation of e-learning environment in the teaching and learning process on higher education. In addition, the results of the study can serve as an important factor for the improvement and development of the educational process supported by the use of technology, thus implementing an e-learning system in order to help and facilitate the students in their studies.
Saving Energy by Replacing IM with BLDC Motor in Fan Application
Authors: NakuÃ§i Loreta , Spahiu Aida
Published: September 2018

Electrical drives with single-phase and three-phase induction motors have been dominant in electromechanical energy conversion in industrial, residential and automotive applications. So far the using of induction motor in these sectors has been a good choice because of its reliability, long life, simple structure, stability, etc. Technological progress in magnetic material technology, power electronics, integrated circuits and microcontrollers have enabled alternative motor technologies such as brushless direct current (BLDC) motors. BLDC motor possesses many advantages comparing with induction motor also DC motor. The using of intelligent control methods improves its performance. These reasons bring to an increasing of the application of this motor in many sectors.Â  The paper aims to show a way of increasing the efficiency of electrical drives through replacing the induction motor with the BLDC motor. In the paper isÂ  compared a permanent magnet based three-phase brushless DC motor with single phase induction motor used in fan application in terms of efficiency. The analysis is specifically related to low power fan applications. Based on the experimental results presented in the paper is clearly noticed that BLDC motors used in fan application can increase efficiency and bring energy saving up to 35% compared to three-phase induction motors.
Quantitative Comparison of Direct Current Shunt and Series Motors Speed Control Methods
Authors: Obi P. I. , Opua Osita , Okeke C. A. , Diyoke G. C. , Onwu I. K.
Published: September 2018

The desired speed of DC motors in most cases is a function of the intending usage, hence, the speed is continually regulated/controlled to suit different usage. Three basic methods are employed in the speed control; the quantitative comparison of these methods was investigated in this paper. For shunt and series motors delivering 11.07Hp and 13.94Hp respectively (at rated speed), the efficiencies were 84.43% and 90.22% with running cost of â‚¦246.00 and â‚¦276.00 respectively. Increasing the shunt motor speed by reducing armature resistance (armature control) reduces the running cost but increases the efficiency from its original values to â‚¦238.70 and 82.89% respectively at 0.6 of the rated armature resistance; decreasing the speed of the motor by this means decreases efficiency and increases running cost. However, increasing the motor speed by decreasing the armature resistance for series dc motors decreases efficiency and also increases running cost, with 0.6 of rated armature resistance used, the efficiency dropped to 83.15% while running cost went up to â‚¦299.47. But decreasing the series motor speed increases efficiency and reduces running cost.
Bengali Longhand Character Recognition using Fourier Transform and Euclidean Distance Metric
Authors: Mukti Mousumi Hasan , Saad-Ul-Mosaher Quazi , Ahammad Khalil
Published: September 2018

Handwritten Character Recognition (HCR) is widely considered as a benchmark problem for pattern recognition and artificial intelligence. Text matching has become a popular research area in recent days as it plays a great part in pattern recognition. Different techniques for recognizing handwritten letters and digits for different languages have already been implemented throughout the world. This research aims at developing a system for recognizing Bengali handwritten characters i.e. letters and digits using Fourier Transform (FT) and Euclidean distance measurement technique. A dataset with 800 handwritten character texts from different people has been developed for this purpose and these character texts are converted to their equivalent printed version to implement this research. MATLAB has been used as an implementation tool for different preprocessing techniques like cropping, resizing, flood filling, thinning etc. Processed text images are used as input to the system and they are converted to FT. Handwritten character of different person may be of different style and angle. The input dataset is collected from various types of people including age level from 5 to 70 years, from different professions like pre-schooling students, graduate students, doctors, teachers and housewives. So, to match the input image with printed dataset (PDS) each printed data is rotated up to 450 left and right and then their FT is computed. The Euclidean distance among the input image and the rotated 30 images of each printed text are taken as intermediate distance set. The minimum value of Euclidean distance for a character is used to recognize the targeted character from the intermediate set. Wrongly detected texts are not thrown away from the system rather those are stored in the named character or digits file so that those can be used in future for deep learning. By following the proposed methodology, the research has achieved 98.88% recognition accuracy according to the input and PDS.
Addressing the Security Issues of Kerberos Method using RAID Level 5
Authors: Mukti Mousumi Hasan , Zaman Sabina , Ahammad Khalil , Muzammel Chowdhury Shahriar
Published: September 2018

Cloud computing is being considered as a revolutionary technique in the field of enterprise hardware and software design and development. As the popularity of cloud computing is increasing day by day and it’s the mostly used technique in the online and automated business system, so the security of the stored data in the cloud and the accessing method of the data through the network must be ensured. Among the various types of server and network authentication protocol Kerberos is the latest and robust network protocol. For authentication, Kerberos is badly in need of a hosted server which has to be remaining running 24*7 and the access point should be a single server (centralized authentication service). Besides these, if the single server gets down, there is possibility of more attack as Kerberos can’t function its job. These are the major hindrance of Kerberos. This research paper has tried to overcome these security issues, accessing and recovering data by using the RAID level. RAID 5 is the most appropriate technique to recover from failure and in correcting the erroneous data by minimizing redundancy as well as mitigating data loss. Also, RAID 5 can be used in case of distributed data. So, a model has been proposed to configure RAID 5 to ensure better security of cloud storage by overcoming the limitations of Kerberos.
Noise Reduction from Speech Signals using Modified Spectral Subtraction Technique
Authors: Muzammel Chowdhury Shahriar , Hasan Mahmudul , Ahammad Khalil , Mukti Mousumi Hasan
Published: September 2018

Varieties of environmental sources of noise and distortion can degrade the quality of the speech signal in a communication system. This research work explores the effects of these interfering sounds on speech applications and introduces a technique for reducing their influence and enhancing the acceptability and intelligibility of the speech signal. In this work, a noise reduction system using single microphone method in time domain to improve SNR of noise contaminated speech is proposed. Traditional Spectral Subtraction method has been reviewed very well and the relationship with wiener filter is also illustrated. The Spectral Subtraction method has been generalized and the focus is put on reducing noise from speech in single channel signals. Voice Activity Detector (VAD) is ignored in this proposed system, because a-priori information about the noise is assumed. The research has been conducted using Gaussian White Noise and Color Noise. The experimental result shows a remarkable improvement in SNR for the generalized version and it is noticed that the result is very much satisfactory when white noises are added but the addition of color noise produces a comparatively poor improvement report. The system has been tested with eight different datasets and on an average, 65.27% improvement in SNR (Signal to Noise Ratio) for White Noise using Generalized Spectral Subtraction Method is achieved comparing with Traditional Spectral Subtraction Method. The average improvement in SNR for Color Noise recorded is 53.31%. The Generalized Spectral Subtraction method is shown to improve the speech quality and to improve SNR as well.
Removal of Structured Noise and Base Line Wander From ECG Signals via LMS Adaptive and Fixed Notch Filter
Authors: Ahammed Kawser
Published: September 2018

This research clearly demonstrates the comparative performance study of Least Mean Square (LMS) adaptive and fixed Notch filter in terms of simulation results and different performance parameters (mean square error, signal to noise ratio and percentage root mean square difference) for removing structured noise (50 Hz line interference and its harmonics) and baseline wandering from electrocardiogram (ECG) signal. The ECG samples collected from the PhysioNet ECG-ID database are corrupted by adding structured noise and base line wandering noise. The simulation results and numerical performance analysis of this research clearly show that LMS adaptive filter can remove noise efficiently from ECG signal than fixed notch filter
Experimental Investigation and Prediction of Tribological Properties of Titanium Carbide and Multiwalled Carbon Nanotubes Reinforced Aluminium Composites using Artificial Neural Network
Authors: Zakaulla Mohamed , Tahir Anteneh Mohammed , Endro Seid , Wodaeneh Shemelis Nesibu , Belay Lulseged
Published: September 2018

In this study, the tribological properties of TiC particle and MWCNTs reinforced aluminium (Al7475) hybrid composite synthesized by stir casting method were investigated by experimental and artificial neural network (ANN) model. Al7475 metal matrix composites was produced with different wt% of TiC and MWCNTs. The composite samples were tested at 0.42 ms- 1, 0.84 ms- 1 and 1.68 ms- 1 under three different loads  (10N, 20N and 40N). The results indicated that Al7475+10%TiC+2%MWCNTs composite exhibit lower wear rate and reduced coefficient of friction in compare to other samples. TiC percent, MWCNTs percent, applied weight, sliding speed and Time were used as input values for the theoretical prediction model of the composite. coefficient of friction and Wear loss were the two outputs developed from proposed network. Back propagation neural network with 5 – 6 – 2 architecture that uses Levenberg –Marquardt training algorithm is used to predict the coefficient of friction and wear loss. After comparing experimental and ANNs predicted results it was noted that R2 was 0.992 for wear loss and 0.980 for coefficient of friction. This indicated that developed predicted model has a high state of reliability.
Thermal and Natural Particles Addition Effects on the Mechanical and Physical Properties of Epoxy–Polyurethane Resin Blend Polymer
Authors: Rasheed Aseel Kais , Rasheed Noor Kais , Marhoon Ismail Ibrahim
Published: September 2018

In this study, natural particles were added to blend polymer resin. Composite material prepared from pistachio shells was added to epoxy–polyurethane blend polymer. The weight ratio of additive for liquid polyurethane to epoxy was 12 wt.%. In addition, their mechanical and physical properties were studied depending on a range of variables, such as temperature (25 °C, 35 °C, 45 °C and 55 °C) and volume fraction (3%, 6%, 9% and 12%). Hardness, impact strength and thermal conductivity were studied. Results showed that the impact strength was increased and that the hardness and thermal conductivity values were reduced at high temperatures. Meanwhile, the impact strength and hardness increased and the thermal conductivity values decreased with increased volume fracture of pistachio shells particles.
Micro and Macro-modeling Techniques for the Simulation of the Masonry Infilled R/C Frames under Earthquake Type Loading
Authors: Soulis Vassilios J
Published: September 2018

Three types of numerical simulation techniques for the masonry infills are adopted in the current paper, namely a micro-modeling technique, a macro-modeling technique and a simulation where the masonry infill and the joint interface between the surrounding frame and the infill is represented by a diagonal strut model. Initially, the hysteretic behavior of three R/C frames with masonry infills tested at the Laboratory of Strength of Materials and Structures of the University of Thessaloniki are examined when they are subjected to horizontal cyclic loads. Non-linear finite simulations are employed, that can describe the reduction of strength and initial stiffness. The inelastic behavior of the frame is simulated including the non-linear simulations of the masonry infill, the formation of plastic hinges for the R/C frame at pre-defined locations and the sliding or the separation of the masonry infill from the surrounding R/C frame. The second part of the present work examines the effectiveness of the micro-modeling technique and that of the diagonal strut model for the numerical simulation of masonry infills inside R/C frame specimens when different types of openings are considered. The results from three framed masonry infill specimens that were tested under horizontal cyclic loading at the University of Osijek have been also utilized for the validation of the micro-model technique and the diagonal strut model that is proposed. Differences and similarities between the adopted numerical modeling techniques are commented and discussed.
Determination of Species Concentrations of Ti-6Al-4V Titanium Alloys using Calibration Free Laser Induced Breakdown Spectroscopy
Authors: Hamad Tagreed K. , Salloom Hussein Thamer
Published: September 2018

In this study, Calibration-free Laser-induced breakdown spectroscopy (CF-LIBS) was applied to quantitatively analyze the elemental composition of Ti-6Al-4V titanium based alloy samples with no need for matrix-matched calibration procedure. Nd:YAG pulsed laser operating at a wavelength of 1064 nm was focused onto the sample to generate plasma. The spectrum of plasma was recorded using spectrophotometer then compared to NIST spectral lines to determine characteristic wavelengths, energy levels and other spectroscopic parameters. The values of plasma temperature obtained using Boltzmann plot for four examined samples ranged from 7439 to 6826 K while the electron density for each element was determined using Boltzmann-Saha equation. The concentration of Ti, Al, V and Fe has been determined and were within the samples nominal concentrations obtained from XRF analysis.  The calculated average relative errors of Ti, Al, V and Fe were 0.39%, 4.38%, 4.94 % and 8.2 %, respectively. Finally, there was a direct proportionality relation between the ratio of ionic to neutral emission lines of Ti for four samples and the surface hardness values measured mechanically using Vickers hardness test. The ratio at   had the best linear regression value (R2=0.95) which indicates the best correlation with surface hardness.
Monitoring of industrial facilities based on the bibinet access control system
Authors: Maj Marcin , Perzyński Tomasz , Pietruszczak Daniel
Published: September 2018

The paper presents a project that allows the registration of work and access control to the area in the facility where up to 10,000 people work, based on the bibinet system. The bibinet system is designed mainly to control access to rooms and record working time of employees in small, medium and large companies.
Evaluation of the quality of layers applied by LDT laser metal deposition
Authors: Mazurkiewicz Andrzej , Poprzeczka Andrzej
Published: September 2018

The article presents the results of a study of C45 carbon steel hardfacing using laser metal deposition with Stellit Co-21 powder. The microstructure of the cross-section of samples prepared with different scanning speed and the amount of used powder at constant laser power was observed. Analyzing the cross-sectional areas of the samples, it was found that, at specific production parameters, cracks occur in weld overlay, which should be associated with the amount of heat supplied and discharged, especially at the unheated basis.This may be confirmed by the presence of deposits of weakly branched dendrites in the microstructure, which should be related to the directional heat dissipation process and rapid directional crystallization. It is possible to regulate these phenomena by selecting appropriate processing parameters. The microstructure analysis of cross-sectional areas of samples after hardfacing using LDT technique indicates good metallurgical quality of the deposit with a small heat affected zone of about 660÷760m. The microhardness measurements on the sample cross-sections indicated a wide micohardness distribution ranging from 510HV1 in the weld overlay, about 410HV1 in the heat affected zone, to 270HV1 in the C45 steel base.
Thermo-mechanical analysis of stress and deformation of engine cylinder block assembly as the attempt to explain an uncontrolled ignition of air-fuel mixture
Authors: Michalski Jacek , Woś Paweł
Published: September 2018

The paper analyzes the possible cause of self-ignition of air-fuel mixture in spark-ignition internal combustion engine loaded with maximum power during tests on the engine dynamometer stand. It leads to incorrect engine operation and may also occur during the flight of an aircraft or helicopter. In order to explain the cause of incorrect engine operation, a non-linear analysis using the finite element method was applied. A discreet model of a simplified engine cylinder assembly system comprising a cylinder body and the liner was determined. The numerical analysis includes both the mechanical force resulting from loading the cylinder liner clamp in the body as well as the pressure of the working medium pressure and the load on the non-uniform temperature field taken from engine test-bed measurements. The results of nonlinear static analysis of stresses and strains for the cylinder body-liner connection have shown that in the area of TDC where outer piston ring turns back, high stresses and plastic deformation of the cylinder liner occurr, causing a lack of contact between these elements. This disrupts the heat transfer from the cylinder liner to the cylinder body and creates the possibility of uncontrolled ignition of the fuel-air mixture.
Analysis of car waste heat recovery system utilizing thermoelectric generator
Authors: Nemś Artur , Simiński Mikołaj , Nemś Magdalena , Magiera Tomasz
Published: September 2018

This paper presents a calculation algorithm for a thermoelectric generator fitted in the exhaust system of a combustion engine. The viability of the presented calculation method was verified on an actual combustion engine. The calculations were performed for a BMW engine, and the generator design was based on a prototype from the same manufacturer. The paper includes calculations of the thermal cycle and of the parameters of exhaust gases from the engine. Subsequent calculations cover heat transfer from exhaust gases to the thermoelectric module and the amount of electric energy obtained from a series of modules. In the last part, the focus is on the influence of engine speed on the performance of the thermoelectric generator.
Diagnostics of railway control devices
Authors: Nowakowski Waldemar , Łukasik Zbigniew , Łukomski Krzysztof
Published: September 2018

Railway traffic control is performed by the man with the use of specific technical means. Technical development and wide functionality of railway traffic control systems contribute to the fact that one deals with many types of devices, created with the help of various technologies. That is why the maintenance of the devices and systems presents a big challenge for railway infrastructure administrators, and it needs to be supported by technical diagnostics. The need for diagnostics of railway traffic control devices results from their destruction process which is related to their lifespan, use intensity, technical service quality or operation quality level. Gathered in the diagnostics process information concerning changes of the technical condition of the devices allow effective restoring to their original state thanks to regeneration. That is why academic research is being carried out and actions connected to implementing new diagnostic methods in the railway traffic control area are taken. The article presents chosen railway traffic control devices diagnostic systems.
Laser hardening of tools with the use of the beam
Authors: Nowotyńska Irena , Kut Stanisław , Kogut Krzysztof
Published: September 2018

The main problem occurring during the laser hardening of tools is the lack of continuity and diversity of surface layer properties as a result of the use of many parallel hardening paths. As a consequence, there may be a forgiven or under-hardened area between successive paths. The paper presents the original method of laser hardening of tools, especially bending, using a laser beam splitter. Such a hardening method enables simultaneous heating and tempering of the tool corner and the surfaces adjoining it at the desired width in one pass with the same parameters. As a consequence, the hardened layer is uniform on the surface of the corner and adjacent surfaces, i.e. without forgiven or unhardened areas. The use of this method requires equipping the hardening laser head with a divider, whose task is to distribute the laser beam to separate parts of the beam with adjustable width by means of appropriately placed mirrors. The new method of hardening not only eliminates the problem of so-called hardening marks created as a result of laser hardening, which directly affects the quality, durability and durability of the tool, but is also much more efficient and also beneficial for economic reasons.
Selected aspect of testing of geometric parameters of suspensions and bodies
Authors: Pawłowski Bogdan
Published: September 2018

The work presents the basic principles on which the operation of devices for testing the suspensions and body geometry, as well as exemplary test of selected parameters.
Analysis of selected operating systems in mobile devices
Authors: Perzyński Tomasz , Pietruszczak Daniel , Ziółek Gracjan
Published: September 2018

The paper presents a comparative analysis of selected operating systems in mobile devices, using smartphones: iPhone 6s and Samsung models from the Galaxy series. The study used freeware applications. It allowed to analysis and compare the devices parameters in users environment.
Electrical features of the engine starting system
Authors: Pszczółkowski Józef
Published: September 2018

The article describes the electrical properties of the engine starting system, that is the acid battery and the electric starter. The dependencies of battery voltage on independent variables affecting them, i.e. capacity, current, temperature or charge status, are discussed. The principles of operation of the battery and electric starter were described and its characteristics were presented, taking into account the properties of the load in the form of a resisting torque and being a source of battery energy. The possibilities of describing the characteristics of the starting system and determining the electrical parameters of the battery and the starter as components of the circuit, i.e. the electromotive force of the battery, resistance, inductance and capacity, are indicated.
Verifying the methodology for speed of ratio changes of continuously variable transmission of a hybrid drivetrain
Authors: Radzymiński Bartosz , Goszczak Jarosław
Published: September 2018

The subject of the study was to verify the methodology for researches of speed of ratio changes of continuously variable transmission of a hybrid drivetrain.
Analysis of composition of linear acceleration body structure of vehicle during the gear changing
Authors: Prażnowski Krzysztof , Drabik Dawid
Published: September 2018

The article presents and discusses the results of vibration measurements of a commercial vehicle body during a gear change. Data obtained during road tests were analyzed in the frequency domain and evaluated for the vibration intensity index affecting the human body.