bluuebunny/crossref_metadata_2025_split huggingface dataset:
Mixed Convection Flow of Magnetized Casson Nanofluid over a Cylindrical Surface
Authors: Alwawi Firas A. , Hamarsheh Abdulkareem Saleh , Alkasasbeh Hamzeh T. , Idris Ruwaidiah 
Published: February 2022

This work aimed to establish a numerical simulation of kerosene oil as a host Casson fluid flowing around a cylindrical shape with an applied magnetic field crossing through it, under constant wall temperature boundary conditions. Nanoparticles of zinc, aluminum, and titanium oxides were included to reinforce its thermal characteristics. The governing model was established based on the Tiwari and Das model. Graphical and numerical results for correlated physical quantities were gained through the Keller Box method, with the assistance of MATLAB software (9.2). The combined convection (λ>0 & λ<0), magnetic parameter (M>0), Casson parameter (β>0), and nanosolid volume fraction (0.1≤χ≤0.2) were the parameter ranges considered in this study. According to the current findings, the growth of mixed convection parameter or volume fraction of ultrafine particles contributes to boosting the rate of energy transport, skin friction, and velocity distribution. Zinc oxide–kerosene oil has the highest velocity and temperature, whatever the parameters influencing it.
Prematurity—Risk Factor or Coincidence in Congenital Glaucoma?
Authors: Dragosloveanu Christiana D. M. , Potop Vasile , Coviltir Valeria , Dinu Valentin , Păsărică Mihai , Ducan Irina L. , Maier Călina , Dragosloveanu Şerban 
Published: February 2022

Background and Objective: To correlate the intraocular pressure with the postconceptional age and identify a statistically significant connection between congenital glaucoma and prematurity. Materials and Methods: The current paper is a retrospective, comparative, case-control study. Data collection featured maternal age, gestational age at birth, birth weight, and intraocular ocular pressure (IOP) measurements. Results: Forty-two eyes of 21 children underwent examination. The participants were assigned into two groups. The Preterm-Glaucoma (PG) group included eight preterm-born children diagnosed with glaucoma, whereas the Preterm (P) group was comprised of premature newborns without the aforementioned condition. There was no statistically relevant difference in birth weight (p = 0.691078) nor in mean gestational age (p = 0.752623) between the two groups. The mean IOP in the PG group was 23.813 ± 4.5493, whereas in the P group, it ranged around 13.231 ± 1.0699, p < 0.0001. Using mixed-effects models, we obtained a reduction in IOP of 0.45 mmHg per week in the first month of life. A further weekly reduction of 0.36 mmHg was achieved in the next two months. Conclusions: The mean IOP of prematurely born children decreased with age. Our findings correlate with previously conducted studies, however, the drop in IOP values exceeded any data published so far. We found no correlation between prematurity and the incidence of congenital glaucoma.
Numerical prediction and experimental validation of sound transmission loss for different acoustic materials
Authors: Kirti S , Mahavir S , Yudhister K Y 
Published: February 2022

This paper examines the sound transmission loss (STL) through multilayer panel materials commonly used in the building industry. The acoustic characteristics of different materials and multilayer panels are studied. Experimental data for the noise reduction coefficient in the frequency range 100 to 4000 Hz have been obtained using the two room’s method. Mass theory is also used to predict the acoustic performance of these systems and to improve their acoustic performance with noise treatment.
Effect of cement types on carbonation depth of concrete
Authors: Merah Ahmed , Korichi Youcef , Khenfer Mohamed Mouldi 
Published: February 2022

Reinforced concrete as a building material is the most used in most civil engineering structures. This one is exposed to several attacks (physical, chemical and mechanical). Among these attacks, we can cite the phenomenon of carbonation, which leads to corrosion of the reinforcements and consequently reduces the service life of reinforced concrete structures. In addition, this phenomenon generates additional repair costs, which can sometimes exceed the initial cost of the building. Furthermore, it depends on the type and class of cement, two main classes of cement are used for the formulation of concrete in Algeria, ordinary Portland cements and cements with additions.
This paper enters in the option of sustainable development, in order to study the behavior of these two types of cements against accelerated carbonation.
For this purpose, two concrete compositions (based on ordinary Portland cements and cements with additions) were formulated, from these two formulations, samples were made in order to subject them to accelerated carbonation in a chamber rich in CO2 according to the recommendations of the AFPC-AFREM.
The results obtained clearly show that concretes based on ordinary Portland cements (OPC) are less sensitive to the phenomenon of carbonation compared to concretes based on blended cements.
Numerical investigation to reduce environmental emissions from manufacturing industries
Authors: Miloua Hadj 
Published: February 2022

This paper aims to study carbon dioxide emissions from the cement manufacturing under wind conditions. These effects are investigated by Computational Fluid Dynamics (CFD) code used both method such as a Large Eddy Simulation (LES) and K-ε methods to investigate a spread of pollution in vicinity of manufacturing. The predicted concentration, velocity and temperature of CO2 were used as the safety criterion to provide the useful information about a pollution amount resulted under variant environmental and structural conditions. A detailed look at results is beyond the scope of analysis to determine optimal CO2 emission. From the present numerical simulation the carbon dioxide appears to be the best candidate as tracer gas and Simulation (LES) methods, which directly calculate the large-scale turbulent structures and reserve modeling offer the best analysis of turbulent flows.
Penerapan Model Decision Tree Algoritma Untuk Mengidentifikasi Penyakit Pencernaan Dengan Pengobatan Herbal
Authors: Latif Nuraida , Ashari  
Published: February 2022

Penelitian ini bertujuan untuk mengidentifikasi penyakit pencernaan dengan pengobatan herbal menggunakan model decision tree algoritma. Penyakit pencernaan merupakan salah satu penyakit yang banyak di derita oleh manusia, dan mengalami peningkatan tiap tahunnya. Pencernaan merupakan salah satu organ manusia yang sangat penting bagi tubuh manusia. Pentingnya kinerja organ pencernaan yang ada di dalam tubuh manusia membuat manusia harus menjaga kesehatan agar tubuh tetap bekerja dengan baik. Pengetahuan masyarakat yang sedikit akan gejala-gejala awal dari suatu penyakit merupakan faktor-faktor penyakit menjadi parah ketika penderita ditangani oleh tenaga paramedis. Data-data penelitian dilakukan dengan penelitian lapangan, studi pustaka, wawancara. Berdasarkan pengujian dan penggunaan sistem informasi, didapatkan hasil quisioner yang menyatakan baik dengan pengujian terhadap kemudahan penggunaan (daya guna) diperoleh hasil 90%, fungsionalitas diperoleh hasil 90%, antarmuka pengguna diperoleh hasil 95%, efisiensi diperoleh hasil 95%, integritas (keamanan) diperoleh hasil 90%, kemampuan adaptasi sistem diperoleh hasil 92,5%, keakuratan diperoleh hasil 90% dan kemudahan instalasi software diperoleh hasil 90%.
TiO2 insertion layer deposited before passivation to reduce etch damage on AlGaN/GaN HEMT
Authors: Qin Yanbin , Wang Quan , Chen Changxi , Xu Jiankai , Jiang Lijuan , Feng Chun , Xiao Hongling , Xu Xiangang , Wang Xiaoliang 
Published: February 2022

Abstract
Γ-gate has been used to increase the breakdown voltage of radio frequency (RF) devices, and the damage caused by gate pin etching has been studied. In this study, a TiO2 layer, acting as a protective layer, was inserted between the AlGaN barrier layer and SiN passivation layer. The AlGaN/GaN high-electron-mobility transistor (HEMT) with TiO2 had no kink effect in its output characteristic, and at high gate voltages, it demonstrated a higher transconductance than the HEMT without TiO2. The HEMT without TiO2 exhibited a more prominent saturation tendency for drain current. Additionally, the C–V test data show that the trap state density of the AlGaN/GaN interface of an AlGaN/GaN HEMT with TiO2 decreased compared with a HEMT without TiO2. DC and C–V test results show that the TiO2 layer can effectively reduce the etching damage of the material under the gate.
All-Ukrainian competition Library of the Year as a tool for disseminating innovative experience in library field
Authors: Soshynska Viktoriya , Dmytrenko Tetiana 
Published: February 2022

The All-Ukrainian competition Library of the Year is considered as a tool for identifying and the widest implementation of library innovations. The organizational principles of holding the All-Ukrainian competition Library of the Year are analyzed on the basis of the competition conditions. The experience of holding competitions for the title of the best library abroad is presented: IFLA Public Library of the Year, Bibliothek des Jahres Deutschen Bibliotheksverband (Germany), Konkurs o nagrodę Marszałka Województwa Mazowieckiego Inspirująca Biblioteka Roku (Poland).
It is emphasized that modern Ukrainian librarians are already actively involved in the project activity, thereby achieving new quality of library products and services, attracting new users, forming a new image of the library. It is noted that not all best library practices receive publicity, support, and dissemination at the all-Ukrainian level, which diminishes the effect of introducing a progressive experience.
The authors of the article analyzed the innovativeness of the projects of the winners of the All-Ukrainian competition Library of the Year (2008—2019), as a result of which it was discovered the main directions of library innovations. They are: Development of library services based on project activity; Implementation of information technologies; Supporting education and self-development; Reading development; Library — community center; Valuable and professional orientation of youth; Creating a model for a new library.
Recommendations for dissemination and replication of implemented library innovations are provided. It was suggested to the organizers of the Contest to develop an especial communication plan and expand the interaction with the media. It is necessary to develop a particular proposal for partners and sponsors of the Contest, which will have good reputational consequences for business.
PENERAPAN MODEL PROBLEM BASED LEARNING UNTUK MENINGKATKAN HASIL BELAJAR SISWA KELAS XI MIA PADA MATERI LARUTAN PENYANGGA
Authors: Safitri Sitti Nur , Saefuddin Saefuddin , Maysara Maysara 
Published: February 2022

Telah dilakukan penelitian Penerapan Model Problem Based Learning untuk Meningkatkan Hasil Belajar Siswa Kelas XI MIA pada Materi Larutan Penyangga. Penelitian ini bertujuan untuk mengetahui perbedaan peningkatan hasil belajar siswa yang diajarkan dengan penerapan model PBL jika dibandingkan dengan siswa yang diajarkan dengan menggunakan model pembelajaran langsung pada materi Larutan Penyangga. Penelitian ini dilakukan dengan metode kuasi eksperimen menggunakan Pretest-Posttest Control Group Design. Pemilihan sampel menggunakan teknik random sampling yaitu kelas XI MIA1 sebagai kelas eksperimen yang diajarkan dengan model PBL dan XI MIA2 sebagai kelas kontrol yang diajarkan dengan model pembelajaran langsung. Pada kedua kelas dilakukan pretest dan posttest menggunakan instrumen tes berbentuk pilihan ganda berjumlah 25 soal. Data keterlaksanaan PBL dan pembelajaran langsung dalam pembelajaran pada materi Larutan Penyangga diambil dengan menggunakan lembar observasi. Nilai rata-rata N-gain kelas eksperimen sebesar 0,69 sedangkan nilai rata-rata N-gain kelas kontrol 0,6. Pengujian hipotesis dilakukan dengan statistik non parametrik yaitu dengan menggunakan uji Mann-Whitney U, diperoleh nilai Asymp sig. 0,001 < α = 0,05, sehingga H0 ditolak dan H1 diterima. Artinya, hasil belajar siswa yang diajarkan menggunakan model PBL lebih baik secara signifikan dibandingkan dengan hasil belajar siswa yang diajarkan dengan menggunakan model pembelajaran langsung.
PENERAPAN MODEL PEMBELAJARAN BERBASIS MASALAH UNTUK MENINGKATKAN HASIL BELAJAR KIMIA SISWA KELAS X PADA POKOK BAHASAN LARUTAN ELEKTROLIT DAN NONELEKTROLIT
Authors: Selfi Dian , Tewa Yuniati , Maysara Maysara 
Published: February 2022

Penelitian ini bertujuan untuk mengetahui peningkatan hasil belajar siswa kelas X pada siswa SMAN 1 Talaga Raya setelah diajar menggunakan model pembelajaran berbasis masalah serta peningkatan aktivitas belajar siswa kelas dengan penerapan Model Pembelajaran Berbasis Masalah pada pokok bahasan larutan elektrolit dan non elektrolit. Penelitian ini adalah penelitian tindakan kelas yang terdiri dari dua siklus, dimana masing-masing siklus terdiri dari tahapan: (1) perencanaan; (2) pelaksanaan tindakan; (3) observasi dan evaluasi; (4) refleksi. Hasil penelitian menunjukkan bahwa penerapan model berbasis masalah yaitu (1) dapat meningkatkan hasil belajar siswa kelas X di SMAN 1 Talaga Raya pada Pokok Bahasan Larutan Elektrolit dan Non Elektrolit dengan nilai belajar siswa secara klasikal yaitu 61,1 dengan presentse ketuntasan 28,57% pada siklus I dan mengalami peningkatan pada siklus II menjadi 80,6 dengan presentase ketuntasan 89,28%. (2) aktivitas belajar siswa terjadi peningkatan dari 64% dengan kategori sedang pada siklus I menjadi 75% dengan kategori baik pada siklus II. Sedangkan aktivitas mengajar guru pada siklus I sebesar 68% meningkat pada siklus II sebesar 86%.Penelitian ini dapat disimpulkan bahwa penerapan model Pembelajaran Berbasis Masalah dapat meningkatkan hasil belajar kimia siswa Kelas X SMAN I Talaga raya pada pokok bahasan Larutan Elektrolit dan Non Elektrolit
PENGEMBANGAN PERANGKAT RENCANA PELAKSANAAN PEMBELAJARAN KIMIA MENGGUNAKAN KURIKULUM 2013 PADA POKOK BAHASAN IKATAN KIMIA DAN BENTUK MOLEKUL
Authors: Kamil Nursahida , Haeruddin Haeruddin , Maysara Maysara 
Published: February 2022

Telah dilakukan penelitian Pengembangan Perangkat Rencana Pelaksanaan Pembelajaran (RPP) Kimia menggunakan Kurikulum 2013 pada Pokok Bahasan Ikatan Kimia dan Bentuk Molekul Kelas X MIPA SMA Negeri 5 Kendari. Penelitian ini bertujuan untuk menghasilkan perangkat Rencana Pelaksanaan Pembelajaran (RPP) kimia pada pokok bahasan ikatan kimia dan bentuk molekul yang layak digunakan berdasarkan kurikulum 2013. Metode yang digunakan dalam penelitian ini adalah Research and Development (R&D) yang dikembangkan oleh Sivasailam Thiagarajan. Pengembangan perangkat Rencana Pelaksanaan Pembelajaran (RPP) pada penelitian ini menggunakan model 4-D yaitu pendefenisian (define), perancangan (design), pengembangan (development), dan penyebaran (dessiminate). Pada penelitian ini hanya dilakukan sampai pada tahap pengembangan. Langkah-langkah dalam penelitian pengembangan ini yaitu pada tahap pendefenisian terdiri atas analisis awal-akhir, analisis siswa, analisis tugas, analisis konsep, dan perumusan tujuan pembelajaran. Pada tahap perancangan terdiri atas pemilihan media pembelajaran, pemilihan format, dan rancangan awal. Pada tahap pengembangan terdiri atas validasi ahli. Hasil penelitian menunjukkan bahwa produk RPP yang dikembangkan divalidasi oleh 4 orang penilai dengan menggunakan lembar validasi dan memperoleh nilai sebesar 98% dan tergolong dalam kategori sangat baik.
EFEKTIVITAS PENDEKATAN PEMBELAJARAN MATEMATIKA REALISTIK TERHADAP KEMAMPUAN PENALARAN MATEMATIS SISWA KELAS VIII SMP NEGERI 10 KENDARI
Authors: Hendrik Hendrik , Hasnawati Hasnawati , Saleh Saleh 
Published: February 2022

Penelitian ini bertujuan untuk: Mengetahui efektivitas pendekatan pembelajaran matematika realistik terhadap kemampuan penalaran matematis siswa kelas VIII SMP Negeri 10 Kendari. Populasi dalam penelitian ini adalah seluruh siswa kelas VIII SMP Negeri 10 Kendari yang terdiri dari 6 kelas paralel yaitu VIII1 – VIII6. Teknik pengambilan sampel menggunakan teknik Simple Random Sampling. Penentuan kelas eksperimen dilakukan secara random dan diperoleh kelas VIII1 sebagai kelas eksperimen dan kelas VIII5 sebagai kelas kontrol. Teknik pengumpulan data dilakukan dengan pemberian instrumen penelitian berupa lembar observasi, angket respon siswa dan tes kemampuan penalaran matematis siswa berbentuk tes uraian. Teknik analisis data menggunakan statistik deskriptif dan statistik inferensial. Berdasarkan hasil penelitian diperoleh bahwa pendekatan pembelajaran Matematika Realistik efektif terhadap kemampuan penalaran matematis siswa kelas VIII SMP Negeri 10 Kendari. Uji hipotesis menunjukkan pendekatan pembelajaran matematika realistik secara signifikan lebih efektif terhadap kemampuan penalaran matematis siswa kelas VIII SMP Negeri 10 Kendari dibandingkan pendekatan saintifik
DESKRIPSI HASIL BELAJAR MATEMATIKA PESERTA DIDIK KELAS VIII SMP NEGERI 19 KENDARI DENGAN MENGGUNAKAN MEDIA GOOGLE CLASSROOM
Authors: Susanto Pebi Tri , Anggo Mustamin , Samparadja Hafiludin 
Published: February 2022

Penelitian ini bertujuan untuk mengetahui : (1) respon peserta didik kelas VIII SMP Negeri 19 Kendari dengan menggunakan google classroom, (2)Pembelajaran online matematika peserta didik kelas VIII SMP Negeri 19 Kendari yang diajar dengan menggunakan google classroom, (3) Hasil belajar matematika peserta didik kelas VIII SMP Negeri 19 Kendari yang diajar menggunakan mediagoogle classroom. Jenis penelitian ini adalah penelitian deskriptif dengan perolehan data menggunakan data kuantitatif. Penelitian ini dilaksanakan di SMP Negeri 19 Kendaritepatnya bulan desember tahun ajaran 2020/2021. Sampel penelitian terdiri dari 3 kelas dengan jumlah 68 orang. Teknik analisis data menggunakam analisis deskriptif. Hasil penelitian yang diperoleh adalah tentang: (1) respon peserta didik SMP Negeri 19 Kendari kelas VIII (2) Pembelajaran matematika online dengan menggunakan media google classroom di SMP Negeri 19 Kendari sebelum jam pembelajaran dimulai guru tersebut mengingatkan masing-masing kelas bahwa pembelajaran akan dimulai. (3) Deskripsi hasil belajar matematika peserta didik dengan menggunakan pembelajaran online google classroom.
HUBUNGAN MINAT BELAJAR TERHADAP HASIL BELAJAR METEMATIKA SISWA KELAS XI SMA NEGERI 1 LADONGI
Authors: Murtini Murtini , Artika Gusti 
Published: February 2022

Penelitian ini adalah penelitian ex post facto yang bertujuan untuk melihat apakah ada hubungan antara minat belajar dengan hasil belajar siswa kelas XI SMA Negeri 1 Ladongi.Populasi dalam penelitian ini adalah seluruh siswa kelas XI SMA Negeri 1 Ladongi tahun pelajaran 2020/2021 yang tersebar dalam 7 kelas. Penentuan sampel dilakukan dengan teknik proportional random samplingdengan cara memilih sembilan siswa dari setiap kelas sebagai sampel penelitian. Teknik pengumpulan data menggunakan angket minat belajar dan dokumentasi untuk data hasil belajar matematika. Secara deskripsif diperoleh siswa yang minat belajarnya baik sebanyak 52 siswa atau 82,54%, siswa yang minat belajarnya kurang sebanyak 11 siswa atau 17,46%, siswa yang hasil belajar matematikanya baik sebesar 59 siswa atau 93,66% dan siswa yang hasil belajar matematikanya kurang sebesar 4 siswa atau 6,34%. Secara inferensial diperoleh terdapat hubungan yang positif dan signifikan antara minat belajar dengan hasil belajar matematika siswa kelas XI SMA Negeri 1 Ladongi.
Analysis of the Influence of Product Quality, Promotion, and Brand Image on the Purchase Decision of Honda Brand Motorcycles
Authors: Adi Tony Margiyanto , Muzdalifah Muzdalifah , Gayatri Askardiya Mirza 
Published: February 2022

The development of the motorcycle business, especially in the country, has recently experienced a fairly high increase. Business competition in this field is automatically getting tougher. Purchasing decisions are an important element in maintaining and growing the company. The purpose of this study was to determine the effect of product quality, promotion and brand image on purchasing decisions for Honda motorcycles in regular class students, either partially or simultaneously. The method used is the analysis of validity and reliability, multiple linear regression equation, correlation, and hypothesis testing (t test and F test) and the coefficient of determination. The study population is classified into a limited population (finite), for a known amount of certainty, a population of about 500 respondents / students. Using the Slovin formula, a sample of 83 respondents was obtained. By using the computer assistance program SPSS for Windows 22.00, the equation of the multiple linear regression line is obtained as follows: Purchase Decision (Y) = 0.258 + 0.255 Product Quality + 0.238 Promotion + 0.598 Brand Image. The relationship between product quality and purchasing decisions is 0.586 quite strong and unidirectional, the relationship between promotions and purchasing decisions is 0.497 strong and unidirectional, and the relationship between brand image and purchasing decisions is 0.597, strong and unidirectional. From the results of the research, the coefficient of determination shows that product quality, promotion and brand image combined on the purchase decision of Honda brand motorcycles is 51.9% while the remaining 48.1% (100% - 51.9%) is influenced by other factors originating from outside this regression model. For example the perception of price, service quality, place or location and others.
Emission-line Variability during a Nonthermal Outburst in the Gamma-Ray Bright Quasar 1156+295
Authors: Hallum Melissa K. , Jorstad Svetlana G. , Larionov Valeri M. , Marscher Alan P. , Joshi Manasvita , Weaver Zachary R. , Williamson Karen E. , Agudo Iván , Borman George A. , Casadio Carolina , Fuentes Antonio , Grishina Tatiana S. , Kopatskaya Evgenia N. , Larionova Elena G. , Larionova Liyudmila V. , Morozova Daria A. , Nikiforova Anna A. , Savchenko Sergey S. , Troitsky Ivan S. , Troitskaya Yulia V. , Vasilyev Andrey A. 
Published: February 2022

Abstract
We present multi-epoch optical spectra of the γ-ray bright blazar 1156+295 (4C +29.45, Ton 599) obtained with the 4.3 m Lowell Discovery Telescope. During a multiwavelength outburst in late 2017, when the γ-ray flux increased to 2.5 × 10−6 phot cm−2 s−1 and the quasar was first detected at energies ≥100 GeV, the flux of the Mg ii
λ2798 emission line changed, as did that of the Fe emission complex at shorter wavelengths. These emission-line fluxes increased along with the highly polarized optical continuum flux, which is presumably synchrotron radiation from the relativistic jet, with a relative time delay of ≲2 weeks. This implies that the line-emitting clouds lie near the jet, which points almost directly toward the line of sight. The emission-line radiation from such clouds, which are located outside the canonical accretion-disk related broad-line region, may be a primary source of seed photons that are up-scattered to γ-ray energies by relativistic electrons in the jet.