bluuebunny/crossref_metadata_2025_split huggingface dataset:
Experimental Determination of the Surface Geometrical Structure Parameters and Tool Wear During Turning the Polymer Concrete
Authors: Kępczak N. , Rosik R. 
Published: September 2020

Abstract
The paper presents the results of experimental determination of the Surface Geometrical Structure (SGS) parameters and tool wear during turning the polymer concrete. Until now, all literature reports have shown that the smoothness and roughness of the mineral cast surface was obtained directly from the mold. However, new applications of polymer concrete, even for some parts of the machine tools, forced the producers to carry out machining, which would improve the parameters of the surface layer. The topic of machining ceramic-based composite materials is a new chapter in the field of machining, which has not been sufficiently researched so far. The article describes the process of experimental determination of dependence of surface layer and tools wear parameters from cutting parameters during longitudinal turning of polymer concrete. The turning was carried out using plates made of a cubic boron nitride (CBN). After machining, the surface roughness and the maximum width of the flank wear were measured. On this basis, the mathematical model of the surface layer and tools wear parameters versus cutting parameters were defined. The authors also attempted to explain the phenomena occurring in the machining zone using variable cutting parameters. Microscopic pictures of CBN plates after machining were also performed. After the study, the final conclusions about the machining of mineral cast material were formulated.
Structural and optical studies of TiO2:Ag2O nanocomposite by sol-gel method
Authors: Koutu Vaibhav , Dhakar Rajesh , Ojha Pragya , Shastri Lokesh , Malik M.M. 
Published: September 2020

Abstract
As TiO2 is suitable for electronic and electrical applications, in the present work the authors have successfully modified TiO2 by adding silver (Ag) to form titanium oxide-silver oxide (TiO2:Ag2O) nanocomposite samples by using sol-gel technique. Characterizations of these composites have been performed using X-ray diffraction (XRD), atomic force microscopy (AFM), scanning electron microscopy (SEM) and UV-Vis spectroscopy. XRD study revealed that the crystal structure of the samples consisted of tetragonal and cubic phases. This study further showed an increment in the average crystallite size from 8 nm to 38 nm with an increase in Ag concentration. The increase in crystallite size has been confirmed additionally by SEM and AFM. The increment in the average particle size of the samples may be attributed to an increase in silver molarity in the TiO2 matrix. Significant red shift in the absorption edge has been observed, causing reduction in the energy bandgap of the composites from 3.89 eV to 3.46 eV with an increase in particle size which is evident from UV-Vis spectroscopic studies. This wide-band gap properties of the TiO2:Ag2O nanocomposite make it suitable for memory-storage devices and dielectric applications.
Structural and morphological characterizations of pure and Ce-doped ZnO nanorods hydrothermally synthesized with different caustic bases
Authors: Ait Abdelouhab Z. , Djouadi D. , Chelouche A. , Hammiche L. , Touam T. 
Published: September 2020

Abstract
This investigation concerns the synthesis as well as structural and morphological characterizations of pure and Ce-doped ZnO nanorods. The samples were synthesized by simple low-temperature hydrothermal process using respectively NaOH and KOH as caustic bases. The as-synthesized nanorods were characterized in terms of their morphological, structural, compositional and vibrational properties. The sizes of the rods were found to be 1.5 μm to 2 μm in length and 250 nm to 300 nm in diameter. The presence of Ce ions in ZnO (NaOH) favored the agglomeration of the rods to form flower-like nanostructures. EDAX measurements showed Zn rich materials with high oxygen vacancy concentration. XRD results indicated that the synthesized ZnO nanorods possess a pure wurtzite structure with good crystallinity. It has also been found that Ce doping deteriorates the crystalline quality of ZnO (NaOH) and improves that of ZnO (KOH). The insignificant intensities observed in FT-IR signals confirm that the synthesized nanorods are of high purity. The Raman spectroscopy studies showed that Ce ions shift the vibrational modes towards lower frequencies. The peaks related to E2 (high) mode in ZnO (KOH) are relatively intense compared to those of ZnO (NaOH). The peaks are found to be shifted and asymmetrically broadened due to anharmonic effects originating from quantum-phonon-effect confinement.
“Our ladies” versus “our dominators”: Gender differences and nationalist discourse in the Polish Olympic coverage
Authors: Organista Natalia , Mazur Zuzanna , Dóczi Tamás 
Published: September 2020

Abstract
The article presents differences in describing sportspeople during the last four Olympic Games in terms of gender and nationality in Polish newspapers. The fundamental goal of the research was to perform the quantitative and qualitative comparison of press materials from four Olympics (Vancouver 2010, London 2012, Sochi 2014, Rio de Janeiro 2016). The content analysis was used for the quantitative part of the study and critical discourse analysis of two newspapers (the broadsheet and tabloid) in Poland for qualitative part. 712 media articles were analyzed. Our analysis has revealed significant underrepresentation of women and also differences in the description of rival competitors as well as overrepresentation of articles about Polish representatives during the Olympics. Those articles dwelt on the issue of nationality much more often and were more emotionally charged. Also, to a great extent, the performance of non-Polish women athletes was left unconsidered. The authors therefore indicate the validity of combining gender analysis and nationality in the context of the Olympic Games.
Drive unit characteristics of a completely electrical passenger aircraft
Authors: Fąfara Jean-Marc 
Published: September 2020

Abstract
Aviation has, over the years, become an inseparable element of human life. Airplanes are very commonly used for various tasks, such as transport of passengers and goods, military attack and defence, rescue, recreation and so on. In spite of the many advantages of aviation, one cannot ignore its disadvantages. The most important disadvantages of aviation are the emissions that cause atmospheric pollution and noise. Additionally, one should remember about the decreasing stocks of non-renewable fuels. These drawbacks affect human health and the natural environment. Therefore, a good alternative to conventional drive units in aircraft may turn out to be electric drive units in the near future. The aim of this article is to check the extent to which today’s knowledge and technology allow the use of electric drive units instead of conventional aircraft drive units. This article presents the concept of electric aircraft, from the electric drive unit to its power supply system. The feasibility of designing an electric jet drive unit for a passenger aircraft was analysed based on the performances of PZL 104 Wilga 35 and Boeing B787 Dreamliner.
Development of energy-efficient IBC with IGBT module for photovoltaic applications
Authors: Prasanna Kumar C , Rao Anand 
Published: September 2020

Abstract
The proposed study is improvised value-engineered modifications for the basic interleaved boost converter (IBC) by including relevant modifications in circuits, which is expected for a better performance in switching with reduction in losses. The newly modified IBC circuit with insulated gate bipolar transistor (IGBT) along with converter has been experimented by simulations and the results are tabulated to modified IBC with metal oxide silicon field effect transistors. Further experimental analysis and validations of the proposed simulation with hardware developed adopting model SKM195GB066D consisting of IGBTs is presented. This study further enhances and summarises the optimum utilisation and the performance of IBC with the proposed IGBT modules that synchronises power diode. Enhancing the simulation outcomes, the hardware is proposed and developed to be tested for a load up to 1.5 kW with the evaluation of key parameters such as efficiency of the converter.
Planetary Temperatures in the Presence of an Inert, Nonradiative Atmosphere
Authors: Nicol John Leslie 
Published: September 2020

Abstract
This study considers solid planets at about 300 K and an inert atmosphere having no interaction with associated radiation. Processes considered include transfer of energy from the surface skin to underlying layers depending on thermal properties. Temperatures of the surface depend on the rates of transfer of energy between soil layers. The atmosphere is warmed at base by contact with the surface, convection and turbulence distributing higher temperatures through the air. Comparisons between theoretical and measured temperatures show a close similarity. Mean planetary temperatures are calculated, depending on thermal parameters and the intensity of light/radiation from the particular solar system.
Image Quality and Radiation Dose for Fibrofatty Breast using Target/filter Combinations in Two Digital Mammography Systems
Authors: Alkhalifah Khaled , Asbeutah Akram , Brindhaban Ajit 
Published: September 2020

Objectives:
The aim of this study was to determine the optimum combinations of target and filter materials for various X-ray tube voltage settings, as well as their effects on image quality and radiation dose. This was done using different digital mammography (DM) imaging systems with a breast equivalent phantom.

Material and Methods:
Two DM units with a tungsten (W) target, silver (Ag), and rhodium (Rh) filters and dual molybdenum (Mo) and Rh targets/filters were used. A tissue-equivalent mammography phantom of 6 cm thickness equivalent to a fibrofatty breast was exposed 20 times to different target/filter material combinations (W/Rh, W/Ag, Rh/Rh, Mo/Rh, and Mo/Mo) and various kV settings (28–34 kV). The signal-to-noise ratio (SNR) and contrast-to-noise ratio (CNR) were calculated for each exposure.

Results:
The W/Ag combination resulted in the lowest entrance skin dose and mean glandular dose (MGD). The MGD for the W/Rh combination was 60% less than that of the W/Ag combination at 34 kV (P < 0.05). There was a direct relationship in the SNR with the Mo/Mo, Mo/Rh, and Rh/Rh combinations and an inverse relationship with the CNR in the 34 kV range. There were statistically significant differences between all five target/filter combinations, and the best SNR and CNR were observed for the W/Rh combination with a reduced radiation dose in the range of 28–30 kV (P < 0.05).

Conclusion:
For a breast thicknesses of 6 cm with a fibrofatty nature, the W/Rh combination delivers high performance in terms of image quality at a lower dose.
The Role of Solubility in Thermal Field Flow Frac-tionation – A Revisited Theoretical Approach for Tuning the Separation of Chain-Walking Polymerized Polyethylene
Authors: Geisler Martin , Plüschke Laura , Merna Jan , Lederer Albena 
Published: September 2020

The influence of the polymer solubility on the separation efficiency in thermal field-flow fractionation (ThFFF) was investigated for a polymer model system of differently branched chain walking polyethylenes in five different solvents, which were selected depending on their physical parameters. The understanding of polymer thermal diffusion has been elucidated using a revisited approach based on the latest thermal diffusion prediction model by Mes,Kok and Tijssen combined with the Hansen solubility theory. Thereby, a significant improvement in the precision of the thermal diffusion prediction and the separation efficiency has been achieved by implementation of the temperature dependency on Hansen solubility parameters. In addition, we demonstrate a method for validation of the segmental size of polymer chains with varying topology by using the revisited thermal diffusion prediction approach in inverse mode and experimental thermal diffusion data.
Efficiency Test of Forecasts: an illustration for Carbon Emission
Authors: Madiha Riaz  , Zobia Bhatti  , Saeed-ur-Rahman  , Shahzad Mushtaq  
Published: September 2020

World Economies are facing numerous challenges concurrently. Among them one of most pertinent is global warming. Almost all the countries are victims of climate changes. Therefore, several economic mechanisms in environmental policy have been adopted to combat the distasteful impacts of climate change. The implication of environmental policies for clean energy environment in a country can be accessed via several channels. Forecast analysis is one of them, it reveals the forthcoming arrangement. The direction of the forecast trend discloses the current as well as potential outlook, indicating the intensity of policy brunt. The study evaluated the forecast and their accuracy to ensure the performance of forecast. Carbon emission in Gulf countries and their forecast are used as a case study. ARIMA model is used to obtain the forecast. Afterward, to evaluate the forecast performance, the study utilized the different efficiency criterion defined by Nordhaus (1987). By following the several efficiency test study found consistent and efficient forecasts. These performance tests ascertain the reliability and accuracy of the trend followed by forecasts. Accurate Forecasts direct better policy formation and management decision with buoyancy. Moreover, earlier policy resolution becomes more lucid.
ESTIMASI PARAMETER MODEL PROBIT PADA DATA PANEL MENGGUNAKAN OPTIMASI BFGS
Authors: Halistin Halistin , Ratnasari Vita , Rahayu Santi Puteri , Patih Tandri 
Published: September 2020

Salah satu model yang dapat menjelaskan pola hubungan antara variabel dependen yang bersifat kategorik dengan variabel independen adalah regresi probit. Dalam regresi probit, variabel independen dapat bersifat kategorik atau kontinu. Regresi probit mrnggunakan fungsi link dari distribusi normal standar. Jika pemodelan regresi probit melibatkan data silang dan deret waktu, disebut model probit data panel. Estimasi parameter model probit data panel random effect menggunakan maximum likelihood estimation (MLE) dengan pendekatan Gauss Hermite Quadrature. Proses iterasi menggunakan metode BFGS. Metode ini digunakan untuk mendapatkan hasil estimasi parameter yang closed form.
Особенности размножения птиц зеленых насаждений города Сыктывкара
Authors: Кочанов С. К. 
Published: September 2020

Изучены особенности гнездовой биологии двух видов дуплогнездников (полевого воробья – Passer montanus L. и мухоловки-пеструшки – Ficedula hypoleuca Pall.) и шести видов открытогнездящихся птиц (белой трясогузки – Motacilla alba L., дрозда-белобровика – Turdus iliacus L., дрозда-рябинника – Turdus pilaris L., серой вороны – Corvus cornix L., грача – C. frugilegus L. и сороки – Picapica L.) в условиях зеленых насаждений г. Сыктывкара и его окрестностей. Показано, что в условиях культурного ландшафта, как и в природных экосистемах, наблюдается межвидовая, сезонная и годовая изменчивость успешности размножения. Изменчивость показателей успешности размножения у разных видов зависела от совокупного действия хищничества (66–75 % общей гибели яиц и птенцов) и эмбриональной смертности (25–60 % гибели яиц и птенцов). В городе на успешность размножения птицбольшое влияние оказывает деятельность человека (25 % общей гибели яиц и птенцов), к которой, главным образом, относятся технические мероприятия, прямое разорение гнезд.
Разнообразие горных тундр с преобладанием в напочвенном покрове лишайников в пределах западного макросклона Приполярного и Северного Урала
Authors: Кулюгина Е. Е. , Дубровский Ю. А. 
Published: September 2020

В статье приведены данные о разнообразии сообществ горных тундр с преобладанием в напочвенном покрове лишайников ключевых участков Приполярного (хребты Малдынырд, Юаснырд, горы Баркова, Еркусей) и Северного (горный массив Тэлпозиз) Урала. Дана характеристика их структуры, видовой насыщенности, приведены списки доминирующего комплекса видов. Проведена NMS-ординация сообществ, позволившая выделить группы описаний, соответствующие синтаксонам, и показавшая высокую степень зависимости распределения выделенных групп от высоты расположения сообществ. Выявлено 12 синтаксонов лишайниковых тундр ранга ассоциации.
Програмування тренувальних занять висококваліфікованих десятиборців з легкої атлетики на етапі безпосередньої підготовки до змагань
Authors: Адамчук Вадим 
Published: September 2020

Purpose: increasing of the adaptation to physical exertion of highly qualified decathletes in athletics at the stage of direct preparation for competitions. Material and Methods: The study involved a group (n = 5) of decathletes in highly qualified athletics (master of sport - 4, candidate to master of sport -1) aged 21-26 years, experience in decathlon 10-12 years with a pronounced tendency to speed and speed-power qualities with types of decathlon. Research methods: analysis and synthesis of literature data, anthropometric methods, determination of the adaptive potential of the cardiovascular system according to the method of R.M. Bayevsky (1997), statistical processing of material using the nonparametric Wilcoxon test. Results. In the programming of the training lesson, the following are provided: setting the immediate goal, highlighting the leading physical quality and technical skills to be improved, selecting complexes of special physical exercises for unidirectional exposure, determining the energy regimes for performing exercises and the intensity of the load. To achieve this goal, we adhered to the principles of overload, recurrence and specificity when performing exercises and applied a concentrated increase in the intensity of physical activity to the limit of latent and obvious fatigue, aimed at developing a successful competitive discipline. Monitoring the intensity of the load was carried out according to the Borg scale and indicators of adaptive potential.
The results of the study showed the rationality of the applied programming of the training session to increase adaptation to physical activity and the feasibility of determining the adaptive potential in order to individually predict the possibility of applying the principle of overload, determining the achieved fatigue limit at the height of the load and assessing urgent recovery.
HUBUNGAN SIFAT SINERGIS HARA N – P DAN PENGARUHNYA TERHADAP KADAR HARA DAUN BIBIT KELAPA SAWIT (Elaeis Guinensis Jacq)
Authors: Mardiana Wahyuni  , Manurung Romualdus 
Published: September 2020

Keberhasilan pembibitan adalah salah satu hal yang penting dalam bisnis perkebunan kelapa sawit. Pemberian pupuk sangat bermanfaat guna meningkatkan kesuburan tanah, pertumbuhan vegetatife bibit kelapa sawit serta meningkatkan daya tahan tanaman terhadap serangan penyakit. Tujuan penelitian ini yaitu mengetahui pengaruh sinergis pupuk N – P terhadap pertumbuhan bibit kelapa sawit serta mengetahui dosis yang optimal, dan hubungan korelasi pupuk N dan P. Penelitian ini menggunakan Rancangan Acak Kelompok (RAK) dengan dua faktor yaitu pupuk N yaitu N0 (0 gr/polybag), N1 (50 gr/polybag), N2 (100 gr/polybag); pupuk P yaitu P0 (0 gr/polybag), P1 (50 gr/polybag), P2 (100 gr/polybag). Hasil penelitian ini menunjukkan pemberian pupuk N berpengaruh sangat nyata terhadap pertumbuhan tinggi tanaman, lingkar batang, berat kering tajuk, dan berat kering akar bibit kelapa sawit. pemberian pupuk P berpengaruh sangat nyata terhadap tinnggi tanaman, lingkar batang dan berat kering tajuk. Pemberian tunggal terbaik adalah N1P1. Korelasi N dan P yaitu Y = 0,4622 + 0,3669 dengan koefisien determinasi 0,6786 dan koefisien korelasi 0,82.
Pengaruh Net Profit Margin (NPM) Terhadap Return Saham Pada Sektor Otomotif Dan Komponen Yang Terdaftar Di Bursa Efek Indonesia (BEI) Tahun 2015-2018
Authors: Mursalin Mursalin 
Published: September 2020

Tujuan penelitian ini untuk menguji pengaruh variabel Net Profit Margin terhadap Return Saham subjek penelitian ini adalah perusahaan Sektor Otomotif dan Komponen yang terdaftar di Bursa Efek Indonesia (BEI) pada periode 2015-2018. Data yang digunakan dalam penelitian ini adalah data sekunder, yaitu data laporan keuangan dan laporan tanggung jawab sosial yang terdapat dalam laporan tahunan (annual report) pada perusahaan sektor otomotif dan Komponen yang terdaftar di Bursa Efek Indonesia tahun 2015-2018. Analisis data dan pembahasan dilakukan dengan menggunakan metode statistik deskriptif yaitu statistik yang digunakan untuk menganalisis data dengan cara mendeskripsikan atau menggambarkan data yang telah terkumpulkan sebagaimana adanya tanpa bermaksud membuat kesimpulan yang berlaku untuk umum atau generalisasi. Hasil penelitian ini secara parsial menunjukkan bahwa uji regresi sederhanaÂ konstanta yaitu 3,388, artinya jika variabel independen nilainya adalah 0, maka Return Saham akan tetap sebesar 3,388. Sedangkan Net Profit Margin memiliki koefisien regresi mempunyai arah negatif yaitu -0,377, artinyaÂ setiap perubahan variabel NPM (X) sebesar 1%, maka akan mengakibatkan perubahan Return Saham sebesar -0,377. Sedangkan uji t Net Prrofit Margin (NPM) berpengaruh dan signifikan terhadap Return Saham.Â Kata Kunci: Net Profit Margin dan Return Saham.
القيم وأهميتها في المناهج الدراسية
Authors: Mouloud Tawfiq Bashaer 
Published: September 2020

هدفت البحث الحالية في التعرّف على (القيم وأهميتها في المناهج الدراسية)، واقتصرت حدود البحث عن المعلومات والأدبيات التي تسهم أن تحقق أهدافه وأتبعت الباحثة لدراسة (القيم) المنهج الوصفي التحليلي لأهميته في المناهج الدراسية كمفهوم القيم وخصائصها ،و الخلفية النظرية عن معنى القيم في الإسلام، والقيم والتنشئة الأسرية القيم والتنشئة السياسية ، والآليات التربوية لإدماج القيم في المناهج الدراسية ، وقد توصل البحث الى بعض الاستنتاجات مثل :

أهمية القيم في حياة المجتمع، للدور الذي تلعبه في تكامل البنية الاجتماعية وانسجام أفراد المجتمع وتماسكهم في ما يواجههم من تحد مصيري في عالم أصبح فيه لموقف المجتمع الموحد أهمية كبيرة لبقائه وديمومته.
ترتبط القيم التربوية في أمة من الأمم، ارتباطًا صميمًا بثقافتها، وعليه فإن فصل القيم التربوية الإسلامية عن إطارها الثقافي السليم، ودمجها في مناخ من الازدواجية الثقافية، أو تركها تحت طائلة الغزو الثقافي، يعرضها للذوبان، وينزع منها الفعالية في صياغة الشخصية الإسلامية القوية وصنع الواقع الحضاري السليم.

المقترحات

دراسة القيم في المناهج الدراسية الحديثة في المراحل الدراسية المختلفة
المقارنة بين المناهج الدراسية الحديثة في الدول المجاورة .
فاعلية الذات التدريسية لدى أساتذة كلية التربية الأساسية
Authors: Radhi Ibtisam 
Published: September 2020

أستهدفت الدراسة تعرف ما يأتي:

فاعلية الذات التدريسية لدى أساتذة كلية التربية الأساسية.
الفروق في فاعلية الذات التدريسية على وفق متغير النوع (ذكور–أناث)

ويتحدد مجتمع البحث الحالي بأساتذة كلية التربية الأساسية في الجامعة المستنصرية ومن كلا الجنسين و للعام الدراسي (2017-2018) وقد بلغ عدد العينة (200) تدريسي وتدريسية وقد قامت الباحثة ببناء مقياس فاعلية الذات التدريسية واستخرجت له الخصائص الاحصائية وقد اظهرت النتائج الى ان تدريسيي كلية التربية الأساسية لديهم فاعلية ذات تدريسية. وتوجد فروق بين الذكور والاناث في فاعلية الذات التدريسية ولمصلحة الذكور. وبناء على نتائج البحث فقد وضعت الباحثة عددا من التوصيات والمقترحات.