bluuebunny/crossref_metadata_2025 huggingface dataset:
Kejawen, Multiculturalism, and Principles of the Qur’an: Transformation and Resupposition of QS. al-Kafirun (109): 6 in Urip Sejati Community of Yogyakarta
Authors: Al Amin Nazifatul Ummy , Taufik Egi Tanadi , Mufidatunrofiah Siti , Ahmad Rifai Idris
Published: July 2020

This article focuses on the idea of multiculturalism in Javanese mythical believing (Kejawen) communities within the paradigm of Qur'anic studies. The discussion of the research emphasizes the axiological shift of QS. Al-Kafirun (109) in the milieu of Urip Sejati community of Yogyakarta, Indonesia. “Urip Sejati” is a Javanese religious society that has developed as a minority group because it is domiciled near to various centers of Islamic civilization as pesantren, historic mosques, and colleges in Krapyak. This research has been held since 2018 by doing literary studies, observations, and interviews through the leaders of Urip Sejati community.The structure of this article features a complex process of analysis on transmission and transformation of Qur'anic interpretations in the paradigm of sociology. It also analyzes the patterns of the phenomenon in a synchronic and diachronic paradigm to get through a worldview reading. On its formal form, the reception of Q.109: 6 in the membership of Urip Sejati contains informative and performative suppositions. This verse became a major foundation for the construction of multiculturalism because it contains the doctrine acknowledged as a verse that supports pluralities.
Rancang Bangun Sistem Informasi Surat Di Majelis Pendidikan Dasar Dan Menengah Pimpinan Wilayah Muhammadiyah Daerah Istimewa Yogyakarta Menggunakan Metode Extreme Programming
Authors: Rahman Jumadil Abdul
Published: July 2020

Correspondence is one activity that can not be separated from an organization, because the mail is one of the important communication media in the organization and communication with other organizations.High-intensity correspondence activities need to have a good management, so that the information conveyed can be delivered properly and safely. This management can also make letters well documented.System development in this research using Extreme Programming method. This method was chosen because the development is still done on a small scale. In addition, this method has a simple process, fast and precise because prioritizing the communication aspects between clients with developers. The built-in information system has features for receiving incoming mail, sending outgoing mail, sending and receiving mail dispositions, and sending and receiving memos. With this system can be effecient mail management and make it easy to manage the data letter itself. Keywords : Agile Process, Letter, Extreme Programming, PHP, Information System
Implementation of Cosine Similarity in an automatic classifier for comments
Authors: Habibi Muhammad
Published: July 2020

Classification of text with a large amount is needed to extract the information contained in it. Student comments containing suggestions and criticisms about the lecturer and the lecture process on the learning evaluation system are not well classified, resulting in a difficult assessment process. So from that, we need a classification model that can classify comments automatically into classification categories. The method used is the Cosine Similarity method, which is a method for calculating similarities between two objects expressed in two vectors. The data used in this study were 1,630 comment data with several different categories. The test in this study uses k-fold cross-validation with k = 10. The results showed that the percentage accuracy of the classification model was 80.87%.
Sistem Pendukung Keputusan Menentukan Karyawan Terbaik Dengan Metode AHP
Authors: Sinaga Anita Sindar R M
Published: July 2020

Giving the best employee nicknames to spur other employees competing to provide the best, especially service to customers. Many things affect productivity and quality and comfort in the working environment. Then there needs to be clear and objective criteria in determining the best employees, not just based on qualitative values. In order to award the right target, the method for decision support systems can be applied in determining the best employees. The Analytical Hearachy Process (AHP) method requires criteria in making a decision so that the best employees can be chosen more quickly and objectively. There are 4 criteria: Attitude, Attendance, Performance and Work Period. of the 4 alternatives (4 employees) obtained by SRI RAHAYU: 0.419 or 41.9%, most deserve to be the best employee.
RUMAH PINTAR BERBASIS PESAN SINGKAT DENGAN MENGGUNAKAN MIKROKONTROLER ARDUINO
Authors: Elisawati Elisawati , Ridarmin Ridarmin , Saputra Ade , Syahrizal Syahrizal
Published: July 2020

Rumah adalah suatu naungan untuk manusia melepas lelah setelah melakukan berbagai aktivitas dan juga sebagai sarana interaksi antar sesama penghuni rumah atau bahkan dengan lingkungannya. Kelalaian pemilik rumah ketika meninggalkan rumah seringkali menjadi pemicu tindak kriminal, misalnya lupa mengunci pintu dan meninggalkan rumah dalam keadaan lampu yang tidak menyala. Untuk mengatasi hal tersebut, diperlukan suatu sistem pengontrolan jarak jauh yang terintegrasi dengan berbagai perangkat yang terdapat di dalam rumah. Pesan singkat (SMS) dapat menjadi solusi karena hampir setiap pemilik rumah memiliki ponsel yang mendukung layanan SMS. Penelitian ini bertujuan untuk membangun suatu prototype sistem rumah pintar yang dikontrol oleh suatu mikrokontroler sebagai pusat kendali. Sistem dihubungkan dengan perangkat yang memodelkan lampu dan kunci pintu yaitu lampu dan Selenoid Lock. Mikrokontroler dihubungkan dengan GSM shield yang berfungsi sebagai perangkat untuk menerima dan mengirim SMS dari dan ke pemilik rumah. Pengujian dari jarak 5m terkirim ± 7 detik, pembalasan ± 6,56 detik, sedangkan pengujian dengan jarak 1km terkirim terkirim ± 6,02 detik, pembalasan ± 6,04 detik. dengan jarak yang berbeda-beda menghasilkan waktu yang berbeda juga dalam pengiriman SMS dan pembalasan SMS bisa cepat atau lambat tergantung dari jaringan handphone dan jaringan pada GSM. Kata kunci : rumah pintar, pesan singkat, SMS, Arduino Uno.
Analisis Perbandingan Sensitivitas AHP dan WP dalam Pemilihan Biro Perjalanan Umrah di Yogyakarta
Authors: Syaka Annisa Khodista , Mulyanto Agus
Published: July 2020

Jumlah jemaah umrah yang semakin meningkat mempengaruhi munculnya banyak perusahaan jasa perjalanan umrah khususnya di Daerah Istimewa Yogyakarta. Hal ini mengakibatkan calon jemaah umrah kesulitan menemukan biro perjalanan umrah yang sesuai dengan keinginannya, sehingga membutuhkan proses pemilihan biro perjalanan umrah dengan metode pengambilan keputusan yang relevan. Penelitian ini menganalisis tingkat sensitivitas metode Analytical Hierarchy Process (AHP) dan metode Weighted Product (WP) dalam pemilihan biro perjalanan umrah. Mengacu pada hasil analisis sensitivitas yang peneliti lakukan pada 6 percobaan dengan jumlah kriteria yang berbeda, metode AHP menghasilkan jumlah perubahan rangking sebesar 881 dan jumlah presentase sensitivitas sebesar 17.898%, sedangkan metode WP menghasilkan jumlah perubahan rangking sebesar 836 dan jumlah presentase sensitivitas sebesar 16.901%. Berdasarkan pada jumlah perubahan rangking dan presentase sensitivitas, dapat disimpulkan bahwa metode AHP merupakan metode yang relevan dalam pemilihan biro perjalanan umrah di Daerah Istimewa Yogyakarta.
Implementasi Metode Scrum Dalam Pengembangan Test Engine Try Out Sertifikasi
Authors: Sauda Siti , Oktaviani Nia , Bunyamin Muhammad
Published: July 2020

Bina Darma University is one of higher education under the auspices of the Region II Higher Education Service Institute committed to producing graduates who have competence. One tangible form that can see from the activities carried out through the Faculty of Computer Science is the capacity-building and capabilities of prospective graduates through the certification program. Available certifications are competency certifications from world-renowned vendors that have licenses to issue certifications. But the problem that occurs is the failure caused by the unfamiliarity of participants in seeing the types of issues to be faced. Even though if it is seen to take a vendor certification exam, it will cost a lot of money and time is not small. For that reason, in this research, an alternative solution was made, namely by making a test engine try out certification. In the process of developing a test engine, the Scrum method is used, which focuses on speed in development. the results of the event show that the test engine produced can function properly and can be used as a try out the tool before conducting a certification exam.Universitas Bina Darma merupakan salah satu penyelenggara pendidikan tinggi di bawah naungan Lembaga Layanan Pendidikan Tinggi Wilayah II berkomitmen untuk menghasilkan lulusan yang memiliki kompetensi. Salah satu wujud nyata yaitu dapat dilihat dari kegiatan yang dilakukan melalui Fakultas Ilmu Komputer yaitu kegiatan peningkatan kapasitas dan kapabilitas calon lulusan melalui program sertifikasi. Sertifikasi yang tersedia merupakan sertifikasi kompetensi dari vendor ternama dunia yang memiliki lisensi untuk mengeluarkan sertifikasi. Namun permasalah yang terjadi yaitu kegagalan yang disebabkan kurang terbiasanya peserta dalam melihat jenis soal-soal yang akan dihadapi.  Padahal jika dilihat untuk mengikuti ujian sertifikasi vendor membutuhkan biaya yang mahal serta waktu yang tidak sedikit. Untuk itu didalam peneltian ini dilakukan upaya alternative solusi yaitu dengan dibuat test engine try out sertifikasi. Dalam proses pengembangan test engine digunakan metode Scrum yang berfokus pada kecepatan dalam pengembangan. hasil pengembangan menunjukkan bahwa test engine yang dihasilkan dapat berfungsi dengan baik serta dapat dijadikan sebagai alat try out sebelum dilakukannya ujian sertifikasi.
Analisis Serangan Web Defacement pada Situs Web Pemerintah Menggunakan ELK Stack
Authors: Hariyadi Dedy
Published: July 2020

Web defacement merupakan serangan yang dikategorikan sebagai serangan siber yang berpotensi. Dampak dari serangan web defacement adalah proses pengembalian ke kondisi semula yang memerlukan mitigasi khusus. Pemantauan serangan web defacement dapat dilakukan dari dua sisi, yaitu sisi internal dan eksternal. Pada penelitian ini pemantauan dan analisis serangan web defacement dari sisi eksternal. Oleh sebab itu diperlukan aplikasi khusus untuk mendapatkan informasi dari OSINT Source penyedia informasi serangan web defacement yang merupakan hasil laporan dari peretas. Informasi yang didapatkan selanjutnya diolah menggunakan ELK Stack untuk mempermudah analisis dalam bentuk visualisasi pada Dashboard.Web defacement merupakan serangan yang dikategorikan sebagai serangan siber yang berpotensi. Dampak dari serangan web defacement adalah proses pengembalian ke kondisi semula yang memerlukan mitigasi khusus. Pemantauan serangan web defacement dapat dilakukan dari dua sisi, yaitu sisi internal dan eksternal. Pada penelitian ini pemantauan dan analisis serangan web defacement dari sisi eksternal. Oleh sebab itu diperlukan aplikasi khusus untuk mendapatkan informasi dari OSINT Source penyedia informasi serangan web defacement yang merupakan hasil laporan dari peretas. Informasi yang didapatkan selanjutnya diolah menggunakan ELK Stack untuk mempermudah analisis dalam bentuk visualisasi pada Dashboard.
Pengembangan Aplikasi Katalog Rumah Berbasis Augmented Reality Menggunakan Algoritma FAST
Authors: Arini Arini , Fitrana Eis Akmeliny
Published: July 2020

Kharia Residence merupakan perumahan yang masih menggunakan katalog 2D dalam pemasaranya, pihak developer menginginkan adanya inovasi pada media promosinya agar dapat meningkatkan minat konsumen terhadap rumah yang ditawarkan. Tujuan penelitian ini dibuat untuk mengembangkan media promosi yang menggunakan 3D dalam menvisualisasikan bangunan rumah dengan memanfaatkan tekonologi Augmented Reality pada katalog perumahanya. Metode penelitian yang digunakan dengan metode observasi, kuesioner, studi pustaka dan metode pengembangan sistem Luther. Alat bantu yang digunakan adalah unity 3D sebagai application bulider dan vuforia SDK sebagai library Augmented Reality yang didalamnya terdapat algoritma FAST Corner Detection yang diukur kedalam Star Rating disetiap markernya. Hasil akhir penelitian ini berupa aplikasi katalog home 3D. Untuk keberhasilan kemunculan objek 3D disarankan agar menggunakan spesifikasi platform dan kualitas star rating marker yang tinggi, serta berada di intensitas cahaya sedang (40 – 1000 lux) dan jarak antara marker dengan kamera AR berada disekitar 10 cm sampai 30 cm dengan sudut 600 sampai 900 . Kata Kunci : Augmented Reality, FAST Corner Detection, Star Rating, Marker, Katalog, Rumah.
Efektifitas Peningkatan Kualitas Lulusan UNBK Melalui E-learning Ujian online Menggunakan Metode LCM
Authors: Radillah Teuku
Published: July 2020

Ujian nasional berbasis komputer (UNBK) masih menjadi polemik bagi siswa maupun pihak sekolah yang menjadikan index kelulusan dari UNBK tersebut sebagai parameter pencitraan nama baik sekolah dan kualitas lulusan dari sekolah tersebut. Minimnya pengetahuan siswa terhadap penggunaan komputer serta akses internet yang masih belum terjangkau dikarenakan letak sekolah yang jauh dipinggiran kota menjadikan siswa – siswi pada SMAN 5 Dumai memiliki kualitas kelulusan UNBK yang cukup rendah. Untuk meningkatkan kualitas lulusan pada SMAN 5 Dumai dibutuhkan suatu aplikasi e-learning berbasis metode Linear Congruent Methods (LCM) yang dijadikan pra-ujian untuk menghadapi UNBK sebagai solusi dalam upaya peningkatan kualitas lulusan siswa nantinya. Adapun rancang bangun aplikasi tersebut menggunakan metode LCM sebagai generate pengacakan soal yang akan diujiankan,dan dengan adanya aplikasi ini diharapkan siswa dapat mempersiapkan diri dengan baik dan terbiasa dalam menghadapi ujian komputer secara online. Kata Kunci : e-learning, kualitas lulusan, LCM
SPK PEMILIHAN BANTUAN BEDAH RUMAH PADA KELURAHAN PURNAMA MENGGUNAKAN METODE SAW
Authors: Yunita Putri
Published: July 2020

Home renovation assistance is an effort to reduce the burden on the poor. Home renovation is an activity to improve people's houses that are no longer suitable to be occupied. To determine whether or not it is appropriate, residents must meet predetermined criteria. The program that has been running so far is still very complicated in the processing of community data, as well as the selection process for prospective recipients, because it requires precision to determine which families are truly entitled to receive house renovation assistance, because the process is still manual. So we need a decision support system using the saw method that can help in determining who has the right to take precedence in getting home surgery assistance. The purpose in making this application is to help those responsible for making decisions easier, as well as preventing mistakes and fraud and making it easier to determine the values of community data criteria that are truly entitled to receive house renovation assistance. Community data processing for the assessment process can be operated with a computer device through an application system that uses PHP programming and uses a MySQL database Keywords: php, spk, saw method, Home Surgery, system, Javascript
KLASIFIKASI DOKUMEN TUGAS AKHIR (SKRIPSI) MENGGUNAKAN K-NEAREST NEIGHBOR
Authors: Akromunnisa Kitami , Hidayat Rahmat
Published: July 2020

Various scientific works from academicians such as theses, research reports, practical work reports and so forth are available in the digital version. However, in general this phenomenon is not accompanied by a growth in the amount of information or knowledge that can be extracted from these electronic documents. This study aims to classify the abstract data of informatics engineering thesis. The algorithm used in this study is K-Nearest Neighbor. Amount of data used 50 abstract data of Indonesian language, 454 data of English abstract and 504 title data. Each data is divided into training data and test data. Test data will be classified automatically with the classifier model that has been made. Based on the research conducted, the classification of the Indonesian essential data resulted in greater accuracy without going through a stemming process that had a 9: 1 ratio of 100.0% compared to an 8: 2 ratio of 90.0%, 7: 3 which was 80.0%, 6: 4 which is 60.0% and the data distribution using Kfold cross validation is 80.0%.
ANALISA CLUSTERING PADA DATA PELANGGARAN LALULINTAS DI PENGADILAN NEGERI DUMAI DENGAN MENGGUNAKAN METODE K-MEANS
Authors: Elisawati Elisawati , Wahyuni Deasy , Arianto Adi
Published: July 2020

The order of traffic on the road is very important for motorists on the highway, the lack of awareness of motor vehicle users and the poor drivers of traffic discipline make the level of traffic violations in driving on the highway always increase so that the number of ticket data received by the Dumai District Court. This research was conducted to analyze and classify data violations using the k-means method to facilitate knowing the types of violations that are often violated by vehicle users. The attributes to be analyzed are the types of violations and types of vehicles. The test was carried out using the Rapidminer 5 application where the data tested was data from the Dumai District Court on December 2017, as many as 616 violations. Central cluster data consists of 3 clusters, namely C1 = Many, C2 = moderate and C3 = few who commit traffic violations. So the results of the data obtained where C1 produces 1 data, C2 gets as much as 4 data and C3 as many as 7 data. Where the type of violation that is often violated is the type of violation that does not use a helmet and the type of vehicle is a motorcycle. From the results of this study can be used or can be followed up with the holding of socialization to reduce the number of traffic violations. Keywords: Clustering Analysis, K-Means, Traffic Violations, Rapidminer
Aplikasi Tata Tertib Berdasarkan Poin Untuk Pelanggaran Siswa Pada Sekolah Menengah Atas
Authors: Widodo Pulla Pandika
Published: July 2020

Schools are A tool to gain formal education. Schools have rules that must be followed, these rules are called the Code of Conduct. This code of conduct is binding and has sanctions based on points for each violation. Each student is given a book that contains school rules that must be followed. If a violation is committed by a student, the teacher who processes it will mark the violation committed in the code of conduct book. This book is held by each student, of course this is very risky, if this book is lost it can be difficult for the teacher who will process other student violations if the student commits another violation. So because it is designed an application that can manage this order so that no longer need the code of conduct held by each student. Each violation will be input directly by the teacher who processes it into the application and the number of points will increase along with the number of violations committed by students
Metode Iterasi Tiga Langkah untuk Menyelesaikan Persamaan NonLinear dengan Menggunakan Matlab
Authors: Wahyuni Deasy , Elisawati Elisawati
Published: July 2020

Newton method is one of the most frequently used methods to find solutions to the roots of nonlinear equations. Along with the development of science, Newton's method has undergone various modifications. One of them is the hasanov method and the newton method variant (vmn), with a higher order of convergence. In this journal focuses on the three-step iteration method in which the order of convergence is higher than the three methods. To find the convergence order of the three-step iteration method requires a program that can support the analytical results of both methods. One of them using the help of the matlab program. Which will then be compared with numerical simulations also using the matlab program.  Keywords : newton method, newton method variant, Hasanov Method and order of convergence
Pengembangan Aplikasi Computer Based Test dengan Protokol Two Central Facilities
Authors: Ibad Muhannad Nasyithul
Published: July 2020

The Indonesian government has issued a policy on Ujian Nasional Berbasis Komputer (UNBK), or it can be called CBT (Computer Based Test). In this study is the development of the CBT system using the Two Central Facilities protocol, which consists of the Central Legitimization Agency (CLA) and the Central Tabulating Facilities (CTF). In developing this CBT system, CLA is used to authenticate the examinees, while CTF is used to provide questions and calculation of exam answers. To maintain security added encryption using the RSA Algorithm (Rivest-Shamir-Adleman) which functions to convert data into ciphertext. From the results of functional trials, this system has succeeded in applying the Two Central Facilities protocol. This system has been connected to the CLA and CTF servers and all data has been successfully encrypted. For this reason, in the future schools will be endeavored to implement the development of the CBT system to avoid fraud.
Journal Classification Based on Abstract Using Cosine Similarity and Support Vector Machine
Authors: Habibi Muhammad , Cahyo Puji Winar
Published: July 2020

One of the problems related to journal publishing is the process of categorizing entry into journals according to the field of science. A large number of journal documents included in a journal editorial makes it difficult to categorize so that the process of plotting to reviewers requires a long process. The review process in a journal must be done planning according to the expertise of the reviewer, to produce a quality journal. This study aims to create a classification model that can classify journals automatically using the Cosine Similarity algorithm and Support Vector Machine in the classification process and using the TF-IDF weighting method. The object of this research is abstract in scientific journals. The journals will be classified according to the reviewer's field of expertise. Based on the experimental results, the Support Vector Machine method produces better performance accuracy than the Cosine Similarity method. The results of the calculation of the value of precision, recall, and f-score are known that the Support Vector Machine method produces better amounts, in line with the accuracy value.
Seleksi Wajah Digital Menggunakan Algoritma Camshift
Authors: Sinaga Anita Sindar R M
Published: July 2020

Real time for digital face database selection using camshift algorithm] Education taken 4-5 years affects physical development. This study uses student digital video data. The recording results are used to identify certain characteristics possessed by a student later stored in the digital file database catalog. The stages of the study consisted of identification, recognition and matching of faces. It starts from converting .mp4 videos to .AVI format. The CAMShift algorithm uses basic HSV colors for tracking face position (tracking) and faces recognition. 1-2 seconds video produces 45-200 frames PNG file. The face matching test results were carried out on several video play, the success of detection: 100% selected, 45%-60%, 80-90%, concluded around 50%-100% successful. Face movements will be caught by the centroid bounding box, if the color of the face is dominant in Hue.
Penentuan Emosi pada Video dengan Convolutional Neural Network
Authors: Prasetyawan Daru , 'Uyun Shofwatul
Published: July 2020

Emosi seseorang dapat ditunjukan melalui ekspresi wajah. Ekspresi wajah manusia dapat berubah-ubah secara dinamis tanpa disadari oleh orang tersebut. Penelitian ini melakukan penentuan emosi dengan melakukan pengenalan ekspresi wajah manusia dan melakukan perekaman untuk setiap perubahan ekspresi wajah tersebut. Metode dalam penelitian ini adalah dengan melakukan klasifikasi terhadap 6 ekspresi dasar wajah manusia ditambah ekspresi netral dengan Convolutional Neural Network (CNN). Pemerataan distribusi data dilakukan untuk meningkatkan kinerja model. Dari pemodelan tersebut, dihasilkan model klasifikasi yang dapat diterapkan pada sebuah video. Model tersebut diuji menggunakan data yang terpisah dari data latih dan dievaluasi menggunakan confusion matrix. Sebagai hasil evaluasi, diperoleh akurasi 74%, rata-rata presisi 75,05%, dan rata-rata recall 74%. Di akhir penelitian ini, peneliti melakukan percobaan dengan menerapkan model klasifikasi tersebut pada beberapa video yang mewakili ekspresi seseorang di dalam video tersebut. Setiap perubahan ekspresi akan direkam dan dianalisis sehingga ditemukan emosi yang paling dominan.
Perancangan Model Pengenalan Kebudayaan Papua Secara Interaktif Berbasis Android
Authors: Dayat Abd Rachman , Angriani Liza
Published: July 2020

Papua yang merupakan provinsi terbesar di Indonesia mempunyai sumber daya alam yang melimpah dan budaya tersendiri yang menjadikannya tempat yang bagus untuk berwisata, namun belum banyak diketahui oleh masyarakat. Saat ini dengan seiring perkembangan zaman muncul teknologi Augmented Reality yang mampu menggabungkan antara dunia nyata dan maya yang dapat dimanfaatkan untuk mengenalkan kebudayaan Papua khususnya kerajinan khas Papua sehingga masyarakat dapat belajar mengenal kerajinan khas Papua dengan lebih interaktif dan menarik. Dengan perkembangan smartphone berbasis Android, memperkenalkan dan melestarikan kerajinan khas Papua dengan Augmented Reality merupakan salah satu cara efektif yang mampu mengajak masyarakat mengenal tentang budaya Papua. Tujuan dari penelitian ini adalah untuk merancang model Pengenalan Kebudayaan Papua Secara Interaktif Berbasis Android sehingga bisa membantu masyarakat mengenal kebudayaan Papua khususnya kerajinan khas Papua. Metode penelitian ini ada beberapa tahap yaitu pengumpulan data tentang kerajinan khas Papua, kemudian membuat model 3 (tiga) dimensi dari kerajinan khas Papua. Tahap selanjutnya adalah merancang sistem menggunakan Augmented Reality yang dapat berjalan pada device dengan sistem operasi Android serta memunculkan obyek 3 (tiga) dimensi dalam bentuk Augmented Reality. Hasil penelitian ini adalah menghasilkan aplikasi berbasis teknologi Augmented Reality mampu mengenalkan kerajinan khas Papua melalui perangkat dengan sistem operasi Android.
Laboratory Evaluation of Modified Asphalt Mixes Using Nanomaterial
Authors: Johnson Thomas W. , Hashemian Leila
Published: July 2020

More demands on pavement—including increasing temperature variability and precipitation and higher loading conditions, along with an increase in the rate of load applications—result in decreased pavement performance and reduce its service life. Three major distresses identified with asphalt pavements are rutting, fatigue cracking, and thermal cracking. Polymers have been frequently used for modification of asphalt binders to improve pavement performance and reduce pavement distress. However, there are problems associated with incompatibility between the modifier (polymer) and the binder as well as a reduction in the aging resistance of the asphalt. Furthermore, asphalt modification with polymers can result in operational difficulties as well as a significant increase in cost. This paper investigates the application of several nanomaterials, including nanoclays (halloysite and bentonite) and cellulose nanocrystals, as promising alternatives to improve asphalt performance and increase the service life of asphalt pavements. Using the Superior Performing Asphalt Pavement (SuperPave) asphalt mixture design and analysis system, the rheological properties of nanomodified asphalt binder and mechanical properties of the resulting asphalt mixes were evaluated at low and high temperatures. Results showed a noticeable improvement in the high-temperature properties of the modified asphalt mixes, with no significant effect on the low-temperature properties of the asphalt mixes or rheological properties of the modified asphalt binder. Considering the cost of the nanomaterials, it was concluded that they may provide a cost-effective alternative for asphalt modification.
Determination of the Fracture Resistance of Ductile Polymers: The ESIS TC4 Recent Experience
Authors: Baldi Francesco , Agnelli Silvia , Andena Luca , Blackman Bamber R. K. , Castellani Leonardo , Frontini Patricia M. , Kučera Jaroslav , Laiarinandrasana Lucien , Pegoretti Alessandro , Salazar Alicia , Warnet Laurent
Published: July 2020

Round-robin (RR) tests carried out under the direction of the Technical Committee 4, “Polymers, Polymer Composites and Adhesives,” of the European Structural Integrity Society (ESIS TC4) showed that the multispecimen methodology employed for the construction of the crack growth resistance curve (J vs crack extension, Δa) of polymers often does not provide reliable data because of the uncertainties associated with the measurement of Δa. With this in mind, the ESIS TC4 attention has been more recently focused on the analysis of a testing scheme based on the load separation criterion, which does not require the measurement of Δa. With the aim to employ this new approach into a standardized procedure, the degree of reproducibility of the results obtainable with the application of this testing scheme to ductile polymers has been assessed by means of multilaboratory RR testing exercises that started in 2011. An ESIS TC4 reference draft protocol was prepared and 10 laboratories participated in the RR activities. The present work describes the load separation criterion-based testing procedure recently examined by ESIS TC4 and gives a summary of the results obtained in the RR activities, which appear encouraging.
Wear and Tensile Behavior of Titanium Carbide and Fly Ash–Reinforced Magnesium Matrix Composites
Authors: Singh Avtar , Bala Niraj , Ram Baljinder
Published: July 2020

Metal matrix composites are considered as suitable materials for enhancing the properties of materials used for automobile and aerospace sectors. This research work is about magnesium matrix composites reinforced with 7 wt. % of titanium carbide and fly ash fabricated by stir casting technique. The particle distribution of the reinforcements in matrix material was examined by using optical microscope and scanning electron microscopy technique. The mechanical and microstructural properties of composites were investigated and compared with stir-cast pure magnesium. Titanium carbide and fly ash–reinforced composite showed around a 55.5 % and 33.3 % increase in hardness, respectively. Titanium carbide–reinforced composite displayed more wear resistance as related to fly ash composite and stir-cast pure magnesium. There was also an increase in tensile strength of composites as equated to stir-cast pure magnesium. The fracture behavior of composites showed the presence of surface cracks, voids, and particles of reinforced material in composites. As compared to titanium carbide–based composite, fly ash composite showed wider voids and agglomeration of fly ash particles in fracture surface. However, the fractured surface of pure magnesium showed deep voids as compared to composites along with elongated dimples.
Experimental Study on the Effect of Emergency Braking without Anti-Lock Braking System to Vehicle Dynamics Behaviour
Authors: Zulhilmi I. M. , Peeie M. H. , Asyraf S. M. , Sollehudin I. M. , Ishak I. M
Published: July 2020

An anti-lock braking system (ABS) is a basic skid control system that can prevent the tire from locking up. In an emergency braking situation, a high possibility that the skidding phenomenon can occur without ABS. This incident become worse when an emergency braking is applied either on wet or dry surfaces. Although ABS is crucial to prevent the collision, some vehicles still do not have ABS. This study is aimed to analyse the vehicle’s dynamic behaviour during emergency braking on wet and dry surface condition. The experimental vehicle model is a Malaysian sedan car namely Proton Persona. This instrumented car is equipped with sensors,video camera and data acquisition systems to determine the vehicle’s motion. In the experiment,when the vehicle reached a maximum speed of 60 km/h, the driver push the brake pedal firmly until the car stop. From the experimental results, the effect of emergency braking without ABS is clearly seen at the wheel speed. The tire locked up can be observed when emergency braking was applied on the wet surface. However, for the emergency braking on the dry surface, the tire decreased gradually. This finding shows that without ABS, the vehicle is unsafe and accident can occur. The experimental data from this study also can be used as a guideline to a researcher and manufacturer in the development of ABS and safety system of the vehicle
Thermal Profile and Microstructure of Wrought Aluminium 7075 for Semisolid Metal Processing
Authors: A. Razak N. , Ahmad A. H. , Maarof M. R.
Published: July 2020

Thermal analysis (TA) is a non-damaging and quick method to check the molten metal’s condition preceding to casting. This paper aims to present the relationship between fraction solid and temperature by utilising cooling curve analysis (CCA), to acquire correct processing parameters for wrought aluminium 7075 in semisolid condition. An induction furnace was used to heat a graphite crucible containing wrought aluminium 7075 alloy up to the temperature of 750 °C. A calibrated Chromel-Alumel K-type thermocouple was placed at the centre of the crucible and was submerged to 15 mm in the melt. The solidification temperature and time were measured by Data Logger GL-220. Normal, intermediate, and high cooling rate conditions were achieved when the crucible was left in an open atmosphere, in an open atmosphere with additional minimum airflow, and in an open atmosphere with the maximum airflow, respectively. It was found that the normal cooling rate was estimated at 2.23 °C/s, the intermediate cooling rate was calculated at 2.88 °C/s while the high cooling rate was recorded at 3.20 °C/s. The increase in cooling rate conditions has a significant effect on the changes of phases during solidification process where it leads to the decreased in liquidus, eutectic and solidus temperature. The microstructure feature was found to have a significant difference with the variation of cooling rates where higher cooling rate led to smaller primary grain size.
Aerodynamic Effect of Wing Mirror Usage on the Solaris 7 Solar Car and Demobil 09 Electric Vehicle
Authors: Korkut T. Batuhan , Goren Aytac
Published: July 2020

This study focuses on the aerodynamic performances of two vehicles by Dokuz Eylul University Solaris Solar Car Project Team. The first vehicle (S7) is a solar-powered vehicle that is designed for World Solar Challenge and the second (D9) is an electric vehicle which is designed for Tubitak EV Challenge. Both vehicles are manufactured using polymer composites and challenged in mentioned races. In this research, a formal optimisation technique based on computational fluid dynamics (CFD) is used to determine the efficient aerodynamic structures under various scenarios. Results clearly show that strategists of the racing teams should take intoaccount the aerodynamic structure of the racing car. Especially before the races which based on efficiency, the apex line is determined, and mirrors should be replaced by back view camera.
CFD Analysis of a Shell and Tube Heat Exchanger with Single Segmental Baffles
Authors: Mohanty S. , Arora R.
Published: July 2020

In this investigation, a comprehensive approach is established in detail to analyse the effectiveness of the shell and tube heat exchanger (STE) with 50% baffle cuts (Bc) with varying number of baffles. CFD simulations were conducted on a single pass and single tube heat exchanger(HE) using water as working fluid. A counterflow technique is implemented for this simulation study. Based on different approaches made on design analysis for a heat exchanger, here, a mini shell and tube exchanger (STE) computational model is developed. Commercial CFD software package ANSYS-Fluent 14.0 was used for computational analysis and comparison with existing literature in the view of certain variables; in particular, baffle cut, baffle spacing, the outcome of shell and tube diameter on the pressure drop and heat transfer coefficient. However, the simulation results are more circumscribed with the applied turbulence models such as Spalart-Allmaras, k-ɛ standard and k-ɛ realizable. For determining the best among the turbulence models, the computational results are validated with the existing literature. The proposed study portrays an in-depth outlook and visualization of heat transfer coefficient and pressure drop along the length of the heat exchanger(HE). The modified design of the heat exchanger yields a maximum of 44% pressure drop reduction and an increment of 60.66% in heat transfer.
Computational Modal Analysis on Finite Element Model of Body-in-white Structure and Its Correlation with Experimental Data
Authors: Abdullah N.A.Z. , Fouzi M.S.M. , Mohd Sani M.S.
Published: July 2020

Nowadays, computational modelling and simulation are highly popular to increase the efficiency, productivity and shorten the product development period. The quality of a structure also can be determined by using computational analysis such as finite element analysis. Body-in-white structure, as one of the most important structures in the automotive field, has gained a lot of interest as the topic of research. This increase the demand of having a good finite element model of the structure. However, since body-in-white is a highly complicated structure, sometimes modelling simplification cannot be avoided. This study intended to investigate the level of accuracy of the simplified body-in-white model that was modelled by using several modelling strategies. The first body-in-white finite element model was modelled by neglecting the existing joint element in its actual structure. The other body-in-white model includes the joint element by including two different one-dimensional elements to replicate the joining in BIW actual structure. Validation on these body-in-white models are performed by correlating the finite element modal properties with the experimental modal properties. The discrepancies that had surfaced after the correlation was reduced by using a model updating method. The discussed results showed that as the model is under major simplification, several parameters were inaccurately assumed in the initial body-in-white model. Thus, the model updating method has successfully determined the less accurate parameter and the level of discrepancies between the model and experimental data were successfully reduced.
Effect of Plunger Speed and Solid Fraction on Automotive Component by Thixoforming Simulation
Authors: Mohamad Kamal M.R. , Bazilah N.F. , M. Pzil N.F. , Idris M.H. , Salleh M.S. , W. Ali W.F.F.
Published: July 2020

Thixoforming is a promising metal forming process to produce near net-shape components with high casting quality. Thixoforming of metallic alloy utilizes the thixotropic behaviour of the material with near globular or globular microstructure in the semi-solid condition. The solid content is between 50% to 70% before forming. In this paper, the effect of plunger speed and a solid fraction on an alternator housing was investigated by advance casting simulation software. The 3D CAD model of the alternator housing was created using SolidWorks software and AnyCasting software is utilized for the simulation of the thixoforming parameter and magnesium alloy (AZ91D) is the material used. The simulation had been done by varying the plunger speed, temperature (solid fraction) of the material, and both Power Law and Bingham Viscosity model are used in the simulation to identify the defect prediction at the end. The simulation result shows that laminar filling in semi-solid slurry able to achieved by controlling the plunger speed and temperature. Slower speed and lower melt temperatures are preferable in thixoforming. Therefore, a solid fraction of the material, plunger speed, and solidification rate do influence the filling behaviour of the casting of semi-solid metal.
The Palestinian Resistance: Nonviolent Praxis in a Gramscian Paradigm
Authors: Yousef Ayman Talal , Foschi Luca , Checa Hidalgo Diego
Published: July 2020

This article analyses the praxis of nonviolent resistance in Palestine through the lens of Gramsci. First, it begins with a historical inquiry into the major phenomena of the Palestinian resistance tradition. Its nonviolent expressions are highlighted in order to prove their continuity as well as their effectiveness, focusing on three uprisings of the national movement where this form of resistance was deployed: the Arab revolt, the First Intifada, and the Al Aqsa Intifada. Then, it presents the framework of the theoretical tradition of nonviolent struggle in order to interpret Palestinian popular resistance actions and strategies. Finally, these forms of resistance are embedded, and subsumed, in a Gramscian alternative hegemonic paradigm, so as to enhance the discussion around an organic nonviolent strategy of political resistance.
Normal Patterns of Histone H3K27 Methylation Require the Histone Variant H2A.Z inNeurospora crassa
Authors: Courtney Abigail J , Kamei Masayuki , Ferraro Aileen R , Gai Kexin , He Qun , Honda Shinji , Lewis Zachary A
Published: July 2020

Neurospora crassa contains a minimal Polycomb repression system, which provides rich opportunities to explore Polycomb-mediated repression across eukaryotes and enables genetic studies that can be difficult in plant and animal systems. Polycomb Repressive Complex 2 is a multi-subunit complex that deposits mono-, di-, and trimethyl groups on lysine 27 of histone H3, and trimethyl H3K27 is a molecular marker of transcriptionally repressed facultative heterochromatin. In mouse embryonic stem cells and multiple plant species, H2A.Z has been found to be colocalized with H3K27 methylation. H2A.Z is required for normal H3K27 methylation in these experimental systems, though the regulatory mechanisms are not well understood. We report here that Neurospora crassa mutants lacking H2A.Z or SWR-1, the ATP-dependent histone variant exchanger, exhibit a striking reduction in levels of H3K27 methylation. RNA-sequencing revealed downregulation of eed, encoding a subunit of PRC2, in an hH2Az mutant compared to wild type, and overexpression of EED in a ΔhH2Az;Δeed background restored most H3K27 methylation. Reduced eed expression leads to region-specific losses of H3K27 methylation, suggesting that differential dependence on EED concentration is critical for normal H3K27 methylation at certain regions in the genome.
Estimation of CO2 Content in the Gas Phase of Melt Inclusions Using Raman Spectroscopy: Case Study of Inclusions in Olivine from the Karymsky Volcano (Kamchatka)
Authors: Mironov N.L. , Tobelko D.P. , Smirnov S.Z. , Portnyagin M.V. , Krasheninnikov S.P.
Published: July 2020

—Carbon dioxide (CO2) is one of the main volatile components of natural magmas, but estimation of its initial contents remains a challenge. Study of melt inclusions in minerals permits a direct estimation of the content of CO2 in the melts. For the precise determination of its content in melt inclusions, it is necessary to analyze the contents of CO2 both in glass and in the fluid daughter phase of the inclusions. In this work, we constructed a calibration dependence of the density of CO2 in the range 0.01–0.22 g/cm3 on the distance between its characteristic peaks in Raman spectra (Fermi diads). The accuracy of density determination is ±0.03 g/cm3. The calibration plot was used to estimate the density of CO2 in the gas phase of melt inclusions in magnesian olivine (Fo84.8-88.5) from basalts of the Karymskii Volcano, eastern Kamchatka. The estimated density was 0.03–0.21 g/cm3. Using these values, we have first evaluated the minimum initial content of CO2 in the parental magmas of the Karymskii Volcano, 0.45 wt.%. These data, along with the known initial content of water (~4.5 wt.%), indicate that the parental magmas began to crystallize at a pressure of at least 7 kbar (depth of >25 km). To increase the reliability of the above method of estimation of the CO2 content in the gas phase of olivine-hosted melt inclusions, we propose to carry out preliminary experimental reheating of inclusions for the complete homogenization of the fluid phase and determination of the 3D size of melt inclusions. The performed study provides a reliable evaluation of the content of CO2 in parental magmas, the depth of crystallization, and the degree of magma degassing and permits a comparison of the compositions of magmatic fluids and high-temperature volcanic gases.
Melting and Parageneses of Global Subducting Water-Enriched Sediment in Closed and Open Systems: Experiment and Thermodynamic Modeling
Authors: Perchuk A.L. , Serdyuk A.A. , Zinovieva N.G. , Shur M.Yu.
Published: July 2020

—The phase relations and melting of subducting sediment were studied in two series of high-pressure experiments at 750– 900 °C and 2.9 GPa and by thermodynamic modeling. In the runs we used a chemical mixture corresponding in composition to global subducting sediment (GLOSS) but enriched in water (H2O = 15.52 wt.% as compared with 7.29 wt.% in GLOSS). The first series of runs was carried out in open capsules, and the second series was performed by the same procedure and at the same P–T–t parameters but in closed (welded) capsules. The products of the runs of both series showed agreement on the P–T conditions of melting and the presence of garnet, carbonate, kyanite, SiO2 phase, and phengite in the parageneses. However, the products of all runs in open capsules contain omphacite, including magmatic one, whereas the products of the runs in welded capsules lack it, except for those obtained in the subsolidus run (at 750 °C). The results of thermodynamic modeling for the composition of the experimental mixture (H2O–GLOSS) in the closed system are in agreement with the experimental data on the hydrous solidus and the stability of most minerals, showing a decrease in the content of omphacite as melt appears. This specific effect caused by the increased pressure of aqueous fluid in the closed system is observed in the welded capsules. Thermodynamic modeling for the H2O–GLOSS composition also shows that a complete decomposition of slab carbonates under “hot” subduction conditions is possible, but this result is not confirmed by our experimental data. Since the melting and mineral growth processes in subduction zones are controlled by migrating fluids and melts, it seems correct to rely on the results of runs in open capsules.