bluuebunny/crossref_metadata_2025 huggingface dataset:
Effect of Surface Applied Organic and Inorganic Corrosion Inhibitors on Reinforced Steel in Concrete
Authors:   Department of Civil Engineering, Sharda University, Greater Noida, India., Kumar Nishant , Chalisey Bisakha ,   Department of Civil Engineering, Sharda University, Greater Noida, India, Saharan Sunil ,   Department of Civil Engineering, Sharda University, Greater Noida, India., Gupta Megha ,   Department of Civil Engineering, Sharda University, Greater Noida, India.
Published: January 2020

This paper presents the results of an experimental investigation carried out to study the effect of surface applied organic and inorganic corrosion inhibitors on reinforced steel in concrete. The reinforcement bars were coated with Neem powder (organic inhibitor) and Zinc powder (inorganic inhibitor) as corrosion inhibitors. The samples of beams of size 100X100X640mm having 4 steel bars as reinforcement were prepared and cured in normal water for 15 days and in saline environment for 42 days. The inhibitors were applied in the form of 2 coats, 4 coats and blend of both. The grade of concrete used was M30. Half-cell Potential and Weight loss measurements were carried out to determine the efficiency of corrosion inhibitors [11]. The corrosion inhibition efficiency of controlled specimen and coated specimens were compared. From the results it was seen that samples with 4 coats of Neem showed 44% inhibition efficiency as compared to control specimens. Similarly specimens with two coats of Neem, four coats of Neem and Zinc also showed better corrosion inhibition efficiency. Highest weight loss was observed in case of control specimen. The study concludes that use of surface applied corrosion inhibitors prove efficient in enhancing the corrosion inhibition efficiency of concrete. Surface applied corrosion inhibitors provide protective layer to the reinforcement thereby protecting it from corrosion and increasing the durability of the structure. This type of technique of using corrosion inhibitors in concrete can be used in various structures such as buildings, bridges, sewage pipes, marine structures, abutments & piers, RCC roads which are subjected to harsh environmental conditions.
Spam, a Digital Pollution and Ways to Eradicate It
Authors:   Department of CSE, Vellore Institute of Technology, Vellore (Tamil Nadu) India., Reddy Chinthapanti Bharath Sai , Chaudhary Shaurya ,   Department of CSE, Vellore Institute of Technology, Vellore (Tamil Nadu) India., Kandasamy Saravana Kumar ,   Department of Computer Science, Vellore Institute of Technology, Vellore (Tamil Nadu) India.
Published: January 2020

Due to the growing popularity of the microblogging and networking sites like twitter, Gmail, Facebook etc., there has been an increase in the number of spammers. Spammers on Twitter seem to be more dangerous than the mail spammers as they exploit the limitation on the characters of Twitter for their own purposes. Spammers have also become creative in framing their content to cleverly escape the classifiers. This survey is thus mainly used to discuss and analyze the recent research that had been put forth regarding the spam detection in social media sites such as Twitter. This survey analyses the papers that tackled various problems faced on Twitter and the problems faced by the methods that have already been presented before. We then compared all the methods present in the papers to see which method or combination of methods could give the best result in detecting spam.
Utilization of Summarization Algorithms for a Better Understanding of Clustered Medical Documents
Authors:   pursuing Ph. D Department of Computer Science and Systems Engineering, Andhra University College of Engineering (A), Andhra University, Visakhapatnam, India., Sireesha Ravi Seeta , Avadhani P. S. ,   Professor, Department of Computer Science and Systems Engineering, Andhra University College of Engineering (A), Andhra University, Visakhapatnam, India.
Published: January 2020

Medical documents contain rich information about the diseases, medication, symptoms and precautions. Extraction of useful information from large volumes of medical documents that are generated by electronic health record systems is a complex task as they are unstructured or semi-structured. Various partitional and agglomerative clustering techniques are applied for grouping the medical documents into meaningful clusters [4]. Multi-document summarization techniques which are recent development in the field of Natural Language Processing are applied to condense the huge data present in the clustered medical documents to generate a single summary which conveys the key meaning. The summarization techniques can be broadly classified into two types [2]. They are: Extractive Summarization techniques and Abstractive Summarization techniques. Extractive Summarization techniques try to retrieve the most important sentences from the given document. Abstractive Summarization techniques try to generate summary with new sentences which are not present in the document. Extractive summarization techniques using Statistical Approaches are applied on the clustered medical documents. Medical summaries help the patients for a better and prior understanding of the disease and they can get a brief idea before consulting a physician. The generated summaries are evaluated using ROUGE (Recall Oriented Understudy of Gisting Evaluation) evaluation technique.
Freehand Sketch-Based Authenticated Security System using Convolutional Neural Network
Authors:   Assistant Professor, Department of CSE, GIT, GITAM (Deemed to be University), Visakhapatnam, India., Amarnadh S. , Reddy Prof. P. V. G. D. Prasad ,   Professor, Department of CS & SE, A.U. College of Engineering, Andhra University, India., Murhty Prof. N. V. E. S. ,   Professor, Department of Mathematics, A.U. College of Science and Technology, Visakhapatnam, India.
Published: January 2020

An Authenticated Security System is a highly desired feature. In this paper, a FreeHand Sketch-based Authentication Security strategy is proposed for authentication purposes by allowing a user to choose one label from a collection of different labels and asking him to sketch the corresponding image for the selected label for registration to avoid mischievous registration and the sketched image gets preprocessed using adaptive threshold with Gaussian mixture and then predicted with a trained Convolutional Neural Network(CNN) data model to generate the necessary image label. The produced image label will compare with selected image label. If both are same then the details will store in the system database. The user gets login with his/her authorized details with sketch based image password. The image password gets preprocessed using adaptive threshold with Gaussian mixture and then predicted with a trained CNN model to produce the image name. The produced image name will compare with the system database for authentication. The methodology is tested with some sample input image passwords and the performance calculation is carried out using metrics like Recall and Precision. The proposed work exhibits the accuracy of approximately 85% by ensuring the authentication for the user security.
A Hybrid Transition for IPv4-IPv6 Co-existence in Small Size Organization
Authors:   Associate Professor, Department of Computer Science and Engineering, Amruta Institute of Engineering and Management Sciences, Bangalore (Karnataka) India., Kumar B. I. D. , G Vasanth ,   Professor, Department of Computer Science and Engineering, Government Engineering College, K. R. Pet (Karanataka) India., T. Sudalai Muthu ,   Associate Professor, Department of Computer Science and Engineering, Hindustan Institute of Technology and Science, Chennai (Tamil Nadu) India.
Published: January 2020

Internet Protocol version 6 (IPv6) is the current generation Internet protocol developed by the Internet Engineering Task Force (IETF) to handle the shortage of IP addresses in IPV4. The transition from IPv4 to IPv6 is gradually being done not happening as anticipated. It is unavoidable to have both IPv4 and IPv6 networks during the transition period, but unfortunately they are not compatible in nature. It is essential to maintain the IPv4 and IPv6 coexistence. The inter-communication ability of IPv4 and IPv6 is the dire need of network community. Many transition techniques are proposed in the recent years. This paper discussed the key difficulties in IPv4-IPv6 transition, and introduced the hybrid approach for coexistence of IPv4 and IPv6. It hybrid the advantages of weightage and tunneling translation techniques for providing inter-communication ability of IPv4 and IPv6. The proposed algorithm has been simulated and the performance metrics; transmission latency, throughput, jitter and delay have been analyzed from end to end host, through various scenarios includes IPv4 only, IPv6 Only, Dual stack, GRE tunneling. The performance of the proposed algorithm is analyzed and the future scope is discussed.
Diagnosis for Early Stage of Breast Cancer using Outlier Detection Algorithm Combined with Classification Technique
Authors:   Assistant Professor, Department of Computer Science, PSPT MGR Government Arts & Science College, Sirkali – Puthur (Tamilnadu) India., Priya M. , Karthikeyan M. ,   Assistant Professor, Division of Computer and Information Science, Faculty of Science, Annamalai University, Annamalai Nagar (Tamilnadu) India.
Published: January 2020

Breast cancer is the most dangerous cancers that lead to women in death. Particularly in the developed countries it takes second leading place that increase the chance of death in women. It can be not easily diagnosed by the lab. It has difficult to identifying at the beginning stage. This cancer begins from breast and disseminate to other body parts. It has cured easily if it is identified at beginning stage. The correct classification of benign cancer can prevent from superfluous treatment for patients. This paper focused on diagnosis early stage of the breast cancer based on data mining algorithms. The automatic diagnosis process plays on important role in data mining. The proposed method has a process of three stages. First, data objects are grouped into clusters using k-means clustering algorithm. Size of the dataset has to shrink gently the computation time also reduced. The second stage, the outlier detection (OD) algorithm has used to detect the outliers from the cancer dataset. Finally, diagnose the cancer is either benign or malignant using decision tree classification algorithm. The breast cancer dataset has been used to test the efficiency of the proposed method. The experiments were conducted in breast cancer dataset before and after removal of outliers. Comparison results prove that the proposed method as serves as the better one with high accuracy. This breast cancer research will help with a medical practitioner to diagnose the breast cancer and so that it helps to recover the patients.
Manfacture of Al-B4c Metal Matrix Composites Via Stir Casting Methode
Authors:   Assistant Professor Mechanical Department, AarupadaiVeedu Institute Of Technology, Vinayaka Mission’s Research Foundation, Deemed To Be University. Having 8 years of experience. Life member in ISTE and ENFUSE., S Sathiyaraj. , kumar S.Kalyana ,   Assistant Professor Mechanical Department, Aarupadai Veedu Institute of Technology, Vinayaka Mission’s Research Foundation, Deemed To Be University, Fayis Mohammed ,   UG Student, Mechanical Department, Aarupadai Veedu Institute of Technology, Vinayaka Mission’s Research Foundation, Deemed To Be University., Jaison N,Ronald ,   UG Student, Mechanical Department, Aarupadai Veedu Institute of Technology, Vinayaka Mission’s Research Foundation, Deemed To Be University, Samraj Rony ,   UG Student, Mechanical Department, Aarupadai Veedu Institute of Technology, Vinayaka Mission’s Research Foundation, Deemed To Be University
Published: January 2020

Aluminum alloys are widely used in the aerospace and car industries due to their low density and suitable mechanical housing, excellent corrosion resistance and wear, and the low thermal coefficient of expansion compared to conventional metals and alloys. Exceptional mechanical residency of those alloys and the relatively low production value lead to a candidate that is very attractive for the diffusion of applications, from scientific and technical point of view. Manufacturing of aluminum alloy based totally casting composite with the aid of stir casting is one of the most within your budget techniques of processing MMC. The primary goal of this paper is to make aluminum metallic Matrix composite with different sythesis of fortification garbage of Boron Carbide Via utilizing mix throwing approach and Hardness of the Al-B4C MMCs measured via Vickers hardness method.
Challenges of and Recommendations for Combining 6-DOF Spatial VR-Interaction with Spherical Videos
Authors: Wiebel Alexander , Keuchel Sascha , Eckenfels Magnus , Drengner Jan , König Werner
Published: January 2020

Paper on combination of spatial VR and 360 video.
Prof. Elżbieta Smułkowa – pierwszej Ambasador Rzeczypospolitej Polskiej w Mińsku
Authors: Goral Agnieszka
Published: January 2020

Artykuł jest poświęcony prof. Elżbiecie Smułkowej, wybitnej polskiej slawistce, byłej kierownik Katedry Filologii Białoruskiej Uniwersytetu Warszawskiego i Katedry Kultury Białoruskiej Uniwersytetu w Białymstoku, pierwszej ambasador Rzeczypospolitej Polskiej w Republice Białorusi. Smułkowa urodziła się w 1931 r. we Lwowie. Jej dzieciństwo przerwała druga wojna światowa: ojciec został zamordowany przez władze sowieckie, a młodziutka Elżbieta wraz z siostrą i matką trafiła na Syberię. W 1941 r. rodzina powróciła do Polski i osiedliła się w Toruniu. Po ukończeniu studiów Smułkowa poświęciła się pracy naukowej i dyplomatycznej. Jej praca na placówce dyplomatycznej w Mińsku wiązała się z rozkwitem stosunków polsko-białoruskich, Jej zasługi na polu nauki i dyplomacji zostały docenione przez polskie władze: w 2005 r. z rąk prezydenta Aleksandra Kwaśniewskiego Smułkowa otrzymała Krzyż Kawalerski Orderu Odrodzenia Polski - polskie odznaczenie państwowe, nadawane za wybitne osiągnięcia na polu nauki, kultury, działalności społecznej, służby państwowej oraz rozwijania stosunków dobrosąsiedzkich z innymi krajami.
Gerakan Mahasiswa (Kajian Tentang Peranan Mahasiswa Universitas Trisakti Pada Mei 1998 Dalam Proses Pergantian Kekuasaan Orde Baru)
Authors: Jubaedah Siti
Published: January 2020

Abstrak: Tragedi penembakan mahasiswa Trisakti pada hari Selasa tanggal 12 Mei 1998 kemudian  terbunuhnya empat mahasiswa di kawasan kampus membuat seluruh warga kampus berduka dan menyebabkan amarah masyarakat, sehingga tidak hanya masyarakat kecil, namun seluruh Indonesia menuntut mundurnya Presiden Soeharto dari tampuk kepemimpinan yang selama 32 tahun telah didudukinya. Demonstasi besar-besaran terjadi dimana-mana. Banyak mahasiswa kemudian berdatangan ke Jakarta menyerukan tuntutan yang sama. Hingga terjadinya pendudukan gedung DPR/MPR RI oleh mahasiswa dari berbagai kampus. Menanggapi semakin derasnya tuntutan untuk mundur, Presiden Soeharto dalam suatu pertemuan di Istana Presiden menyatakan menolak untuk berhenti. Namun dengan semakin banyaknya tuntutan dari pelosok negeri akan mundurnya Presiden Soeharto, akhirnya tanggal 21 Mei 1998 menyatakan berhenti, delapan hari setelah Tragedi Trisakti. Begitu besar pengaruh Gerakan Mahasiswa Trisakti sehingga Soeharto meletakan jabatan yang sudah 32 tahun didudukinya. Dampak Gerakan Mahasiswa Trisakti tidak hanya sampai disitu, perubahan disegala bidang baik sosial maupun pemerintahan merupakan dampak terbesar dari Gerakan Mahasiswa Trisakti 1998. Namun Tragedi Trisakti masih menyisakan pekerjaan rumah bagi kita semua. Pengusutan kasus Trisakti belum selesai dan pihak yang harus bertanggung jawab terhadap kasus tersebut masih belum diadili. Tetapi, hal tersebut tidak akan membuat mahasiswa Indonesia berhenti berjuang untuk menyerukan suara rakyat.Kata Kunci: Gerakan Mahasiswa, Trisakti, Orde Baru, Reformasi
Pemerintahan Nagori Rabuhit 1968-2017
Authors: Hutauruk Ahmad Fakhri , Ginting Andres M
Published: January 2020

Nagori Rabuhit yang berada di Kecamatan Gunung Maligas Kabupaten Simalungun yang dahulunya dihuni oleh etnik Simalungun menjelma menjadi pemukiman etnik Jawa. Hal ini disebabkan beberapa faktor yang membuat penduduk “asli” keluar dari daerah tersebut. Nagori Rabuhit telah memiliki pemerintahan jauh sebelum era 60-an yang diyakini telah memiliki sistem pemerintahan sebelum Kemerdekaan Republik Indonesia. Oleh karena itu perlu diteliti lebih dalam bagaimana berdirinya pemerintahan Nagori Rabuhit tersebut. Penelitian ini menggunakan metode penelitian sejarah. Adapun teknik pengumpulan data dilakukan dengan cara: (1) observasi, (2) wawancara, (3) studi dokumen dan (4) studi pustaka. Sedangkan teknik analasis data peneliti melakukan: (1) heuristik, (2) verifikasi, (3) interprestasai dan (4) historigrafi. Adapun hasil penelitian yang diperoleh bahwa jauh sebelum tahun 1960-an pemerintahan Nagori Rabuhit sudah berdiri, namun menjadi kendala untuk menentukan sejak tahun berapa pastinya berdiri pemerintahan tersebut. Hal ini dikarenakan tidak ditemukannya bukti tertulis mengenai kapan berdiri dan siapa pendiri nagori tersebut. Hasil wawancara juga tidak menunjukkan hasil yang signifikan karena para narasumber juga tidak pernah melihat bukti tertulis sejak kapan berdirinya Nagori Rabuhit tersebut. Seiring perkembangan zaman, Nagori Rabuhit menjadi desa mandiri dan maju baik dari aspek ideologi, politik, sosial, ekonomi, budaya, pertahanan dan keamanan. Hal ini didorong juga dengan adanya trasnmigran dari Jawa yang membuat Nagori Rabuhit kaya akan nilai-nilai kultural akibat proses akulturasi di Nagori tersebut.Kata Kunci: Pemerintahan, Nagori Rabuhit
Efectividad de un curso de Gestión de la Información para promover alfabetización informativa en universidad
Authors: Caudillo Ruiz Dora Yessica , Montes Silva Melanie Elizabeth , Castro Lizola Marilú
Published: January 2020

El plan de estudios de la Ingeniería en Diseño Gráfico Digital de una universidad privada en México, incluye en primer semestre el curso de Gestión de la Información, el cual busca desarrollar habilidades y destrezas informativas y tiene un enfoque fuertemente teórico. En segundo semestre se ofrece el curso de Comunicación Oral y Escrita en Español, en el que deben aplicar lo aprendido previamente para la elaboración los trabajos propios de la materia. El problema que se busca analizar en este trabajo es identificar si los estudiantes aplican sus conocimientos sobre alfabetización informativa, particularmente lo relacionado al uso ético de la información, actualidad y tipo de fuentes consultadas. Los métodos de recolección de datos fueron tres: (1) revisión de trabajos de los estudiantes mediante una lista de cotejo y con técnicas bibliométicas, (2) entrevista grupal con los estudiantes que tomaron ambos cursos, y (3) entrevista con las profesoras que impartieron cada asignatura. Entre los resultados destaca que los estudiantes identifican sus necesidades informativas, tanto para la materia de Comunicación Oral y Escrita en Español como para su área de formación; cuentan con elementos para evaluar la actualidad y pertinencia de las fuentes de información, así como nociones generales sobre el manual de estilo que se les solicita seguir, y recurren a fuentes actuales y adecuadas según el tipo de trabajo solicitado. Sin embargo, se aprecia la necesidad de hacer ajustes al diseño curricular de la materia de Gestión de la Información, para que esta tenga un enfoque más práctico.
APLIKASI SISTEM INFORMASI LOWONGAN PEKERJAAN BERBASIS ANDROID DAN WEB MONITORING (Penelitian dilakukan di Kab. Karawang)
Authors: Baenil Huda  , Saepul Apriyanto
Published: January 2020

Tujuan penelitian adalah untuk (a) memberikan informasi lowongan pekerjaan secara real time. (b) mengetahui informasi lowongan pekerjaan secara cepat dan akurat. (c) mengirimkan cv pelamar dengan efektif dan efesien. Dalam penelitian ini, metode pengumpulan data yaitu dengan metode studi kasus dan metode pengembangan sistem yaitu dengan model waterfall. Kemudian dilengkapi perangkat Android yang akan digunakan dalam penginputan data informasi lowongan pekerjaan ataupun data informasi pelamar dan Web Monitoring sebagai penyedia informasi data terpusat yang ada di dinas sosial tenaga kerja. Dari hasil penelitian ini diharapkan mendapat informasi lowongan pekerjaan dan data pelamar yang valid sesuai dengan informasi sebenarnya. Serta tidak adanya penyalah gunaan dan manifulasi data. Khususnya informasi dari lowongan pekerjaan yang ada di kabupaten karawang.

 

 

Kata Kunci : Lowongan pekerjaan, real time, perangkat Android, Web Monitoring.
Role of School-Based Management (MBS)
Authors: Maman Mulya Karnama  , Depi Prihamdani
Published: January 2020

The development of Science and Technology has an impact on major changes that occur in the world of education. One of the fundamental changes in the world of education is at the management level, from central-based management to regional-based management. The method used in this paper is only based on literature review / literature, so to find out the role of implementing School-based Management (MBS) in teaching and learning in schools, will be reviewed and reviewed based on facts and opinions from experts who are competent in the field of education.
Comparative Studies of Intra and Inter Specific Hybrid of F2 Generations in Mungbean
Authors: Pandiyan M  , Krishnaveni A  , Sivakumar P  , Vaithiyalingan M  , Jamuna E  , Radhakrishnan  , Sivakumar C
Published: January 2020

Intra and interspecific hybridization was done for developing donor with respect to MYMV and Bruchids resistance. Several differences in many characters were observed in intra and interspecific hybrids crosses for certain characters. Among all the combination of both intra and interspecific crosses studied, single plant yield increased through only intra specific crosses attempted while resistance to biotic stresses like MYMV and bruchids were improved by interspecific crosses. Hence the utilization of wild species in crop improvement is very effective for donor development compared to intra specific crosses.

Keywords: Vigna radiata; Wild Vigna species Intra and Interspecific; Hybridization; Comparative Traits
DINAMIKA PASCA ARAB SPRING
Authors: Rofii Muhammad Syaroni
Published: January 2020

The civil war that occurred in Syria shows a humanitarian tragedy in the twenty-first century.This conflict originally was part of a dynamic in democratic transition but turned into a prolonged civil war. It can be concluded that the cause of this tragedy is none other than because of a proxy war involving big countries. In this research, it was found that the failure of peace in Syria is inseparable from the influence of the big powers who use their influence to block any vetos related to Syrian crisis in United Nations. Each external actors attempt to protect their national interests and agendas at the same time reduce universal values. Conflict in Syria involving Rusia on one hand and the United States on other hand. Both coutries have different plan toward regime change in Syria which lead to other dimension of proxy war in contemporary world. This article attempted to explore the pattern of proxy war in Syria and its influence toward the stability of the region.
Aktivitas Antibakteri Ekstrak Etanol Herba Apu-Apu (Pistia stratiotes) terhadap Staphylococcus aureus
Authors: Dianasari Dewi , Iftitah Maulidya Barikatul
Published: January 2020

S. aureus merupakan salah satu bakteri gram positif yang dapat  menyebabkan infeksi  bernanah,  infeksi kulit  ataupun infeksi serius seperti mastitis, pneumonia dan infeksi saluran kencing. Penemuan senyawa aktif baru berasal dari tumbuhan merupakan potensi alternatif sebagai agen antibakteri. Salah satunya ialah tanaman dengan famili Araceae dari genus Pistia yaitu Pistia stratiotes atau yang biasa dikenal dengan sebutan apu-apu. Penelitian ini dilakukan  untuk membuktikan secara ilmiah adanya aktivitas antibakteri dari ekstrak etanol herba apu-apu (Pistia stratiotes) terhadap Staphylococcus aureus. Uji antibakteri dengan metode difusi cakram dilakukan pada 6 kelompok, yaitu 4 kelompok perlakuan ekstrak etanol herba apu-apu dengan berbagai konsentrasi (10%; 20%; 30%; dan 40%), satu kelompok uji berisi kontrol negatif yaitu DMSO 10%, dan satu kelompok uji lainnya berisi kontrol positif yaitu gentamisin cakram 10µg.  Aktivitas  antibakteri  ekstrak  etanol  herba  apu-apu  (Pistia  stratiotes) terhadap S. aureus dari yang tinggi ke rendah secara berurutan adalah konsentrasi 40%, konsentrasi 30%, konsentrasi 20%, konsentrasi 10% dengan nilai diameter zona hambat berturut-turut sebesar 9,0 mm ± 0,30; 8,1 mm ±0,20; 7,4 mm ± 0,33; dan 6,5 mm ±0,17. Berdasarakan hasil penelitian, maka dapat disimpulkan bahwa ekstrak etanol herba apu-apu pada konsentrasi 10%; 20%; 30%; dan 40% memiliki aktivitas antibakteri terhadap S. aureus.
PENERAPAN SISTEM UJI PROFISIENSI UNTUK PRODUK SEMEN
Authors: Ratnawati Ratnawati , Sofianti Elis , Frista Rhoito
Published: January 2020

Pengelolaan mutu hasil uji laboratorium merupakan hal yang sangat penting untuk diterapkan, karena berkaitan dengan mutu suatu hasil analisis atau pengujian. Selain mengendalikan mutu hasil pengujian (quality control), laboratorium juga perlu untuk menjamin mutu dari hasil analisa atau pengujian yang dilakukannya (quality assurance). Salah satu cara untuk dapat menjamin mutu suatu hasil pengujian laboratorium adalah uji profisiensi atau uji banding laboratorium. Salah satu yang memerlukan pelaksanaaan uji profisiensi adalah laboratorium semen. Hal tersebut dikarenakan semen merupakan produk yang perlu dijamin mutunya melalui pengujian. Penerapan sistem uji profisiensi ini yaitu dengan menggunakan tiga perangkat evaluasi data, yaitu grafik ZScore, grafik Youden, dan grafik ketidakpastian. Pada grafik Youden, dapat terlihat laboratorium yang mempunyai kesalahan acak maupun kesalahan sistematik. Berdasarkan data yang diperoleh dari setiap peserta, untuk parameter pengujian CaO, terdapat 2 laboratorium yang mempunyai kesalahan acak, yaitu LS-5 dan LS-6, sedangkan yang memiliki kesalahan sistematik ada 3 laboratorium, yaitu LS-9, LS-18 dan LS-19.Kata kunci : Profisiensi, quality assurance, semen, laboratorium
ANALISIS PENGARUH LAJU PUTAR TERHADAP KOROSI BAJA KARBON API 5LX65 MENGGUNAKAN METODE ELECTROCHEMICAL IMPEDANCE SPECTROSCOPY
Authors: Solehudin Agus , Lukman Asep
Published: January 2020

Pada percobaan ini, telah dipelajari pengaruh laju putar terhadap laju korosi baja karbon API 5LX65 yang direndam selama 24 jam dalam larutan NaCl 3,5% + 500 mg/L H2S menggunakan metode EIS (Electrochemical Impedance Spectroscopy) pada suhu 50oC dan pH 4 dengan variasi laju putar 50 rpm, 150 rpm, dan 250 rpm. Hasil percobaan memperlihatkan pergeseran dan penyempitan kurva setengah lingkaran impedansi imaginer terhadap impedansi real, dengan meningkatnya laju putar dari 50 rpm sampai dengan 250 rpm. Hal ini mengindikasikan bahwa aktifitas pelarutan baja meningkat dengan percepatan laju putar. Nilai Cdl meningkat dengan meningkatnya laju putar. Nilai tahanan polarisasi (Rp) semakin menurun dengan meningkatnya laju putar, sementara nilai tahanan larutan (Rs) relatif tidak berubah. Potensial korosi pada laju putar 50 rpm, 150 rpm dan 250 rpm stabil  pada -517 mV hingga -508 mV terhadap Ag/AgCl. Gabungan pengamatan Scanning Electron Microscope (SEM), Energy Dispersive Spectroscopy (EDS) dan X-Ray Diffractomer (XRD) menunjukkan terbentuknya lapisan produk korosi. Hasil analisis XRD spesimen uji yang dikorosikan pada suhu 50oC selama 24 jam menunjukkan bahwa lapisan produk korosi mengandung besi sulfida (FeS). Morfologi permukaan spesimen ini memperlihatkan adanya korosi sumuran.Kata kunci: laju putar, korosi, baja karbon, EIS, H2S
PENGENDALIAN MUTU NO GOOD (NG) TERTINGGI PRODUKSI BERMASALAH DI INDUSTRI PEMBUAT BATTERY CARBON DENGAN METODE QC SEVEN TOOLS
Authors: Abdullah Hafid , Suhardjo Kuntari Adi
Published: January 2020

Tulisan ini menyajikan analisis pengendalian mutu No Good (NG) tertinggi produksi bermasalah di industri pembuat battery carbon dengan metode QC seven tools sebagai upaya peningkatan kepuasan konsumen telah dilakukan. Dalam penelitian ini dilakukan contoh kasus penanggulangan NG inside crack di bagian battery carbon PT. I. Penerapan metode QC seven tools, meliputi: (1) check sheet, (2) stratifikasi, (3) pareto diagram, (4) histogram, (5) control chart, (6) fish bone diagram, (7) scatter diagram. Hasil analisis dan usulan kaizen diperoleh: (1) jenis NG inside crack ada di urutan ke-1 (78%) sehingga menjadi masalah utama yang harus segera ditanggulangi, (2) penyebab NG produksi bermasalah adalah karena operator, mesin dan peralatan, cara kerja dan lingkungan kerja, (3) melalui usulan kaizen dengan menurunkan NG menjadi 50% dapat dihemat biaya inside crack sekitar Rp. 2,5 juta/bulan. Bahasan ini diharapkan menjadi contoh kasus sebagai upaya peningkatan kepuasan konsumen agar produk yang dihasilkan memiliki daya saing di pasar global.Kata kunci: pengendalian mutu, tujuh alat QC, battery carbon
PERANCANGAN PERANGKAT LUNAK MANAJEMEN PROYEK BERBASIS PROJECT MANAGEMENT BODY OF KNOWLEDGE PADA INSTANSI PEMERINTAH
Authors: Ginanjar Galih , Arman Arry Akhmad
Published: January 2020

Perangkat lunak manajemen proyek berbasis Project Body of Knowledge pada instansi pemerintah telah dirancang. Rancangan berbasis metode pengembangan perangkat lunak OpenUP melalui fase-fase inception dan elaboration. Kedua fase tersebut mencakup vision document, plan project, architecture notebook, iteration plan, risk list, work item list, dan system wide requirement. Arsitektur perangkat lunak dirancang dengan pendekatan 4+1 View Model Software Architecture.Kata Kunci : manajemen proyek, PMBOK, pemerintah, OpenUP
KETIDAKSESUAIAN PRODUK ELEKTRONIKA SETERIKA LISTRIK, POMPA AIR DAN TV TABUNG/CRT TERHADAP STANDAR NASIONAL INDONESIA YANG DIBERLAKUKAN SECARA WAJIB
Authors: Rahardi Susanto Sigit
Published: January 2020

Pemberlakuan regulasi SNI wajib terhadap produk elektronika seterika listrik, pompa air dan TV tabung telah dilaksanakan sejak tahun 2010. Beberapa ketidaksesuaian terhadap standar nasional didapati pada hasil pengujian yang dilakukan laboratorium di Balai Besar Bahan dan Barang Teknik (B4T). Ketidaksesuaian tersebut dapat diatasi pabrikan dengan baik.Kata kunci: Kesesuaian, SNI, Keselamatan, Seterika listrik, pompa air, TV Tabung/CRT
ANALISIS KEGAGALAN DONGKRAK REL KERETA API KAPASITAS 10 TON
Authors: Surasno Surasno , Tjahjohartoto Budi
Published: January 2020

Pemeliharaan rel di lintasan jalan kereta api bertujuan untuk keamanan dan keselamatan perjalanan kereta api ketika  melintas  di  atas  rel.  Untuk  menjaga  kestabilan  tinggi  muka  rel  terhadap  posisi  awal  maka  perawatan ketinggian permukaan dengan menggunakan dongkrak rel dengan cara mengembalikan posisi rel pada kedudukan titik awal. Dongkrak rel mekanik dengan daya angkat 10 ton dan tinggi ungkit 5–10 cm yang digunakan oleh PT KAI umur pakainya relatif pendek. Penelitian analisis kegagalan pada dongkrak rusak disebabkan oleh cacat gompal pada rack-gear pengangkat yang diawali oleh kerusakan korosi di bagian-bagian  rangka sisi sebelah muka dalam, bushing, rack-gear pengangkat, poros pinion, dan spline utama. Kerusakan komponen ini ditandai oleh penipisan bidang  kontak  antar  gigi  sehingga  menjadi  longgar  dan  ketika  bidang  ini  menerima  beban  dinamik  berulang terjadilah gompal dan patah. Oleh karena itu, untuk mencegah terjadi kerusakan berulang kembali pada dongkrak rel disarankan bahan-bahan komponen yang bersentuhan dengan komponen lain seperti rack-gear pengangkat, roda gigi, poros pinion, spline utama, bushing dan bidang tumpuan dilakukan penggantian. Selain itu, pada bidang komponen yang bersentuhan dengan komponen lain dilakukan perawatan dengan cara pelumasan.Kata kunci: dongkrak rel, analisis kegagalan
THE EFFECT OF TANNIN ON CARBON STEEL CORROSION IN NITRIC ACID SOLUTIONS
Authors: Asoka Anna Sonya , Artha Listiani , Nurdin Isdiriayani , Devianto Hary
Published: January 2020

Carbon steel is commonly used as construction material of processing equipment due to its strength, ease of fabrication, and low cost. Nevertheless, carbon steel is susceptible to corrosion by process fluid, like nitric acid. However, corrosion effect can be reduced by inhibitor addition. Tannin is one of carbon steel corrosion inhibitors in acidic solution. Tannin is an organic compound which has hidroxyl and carboxyl functional groups, decomposed easily, and non-toxic. The aim of this research is to determine the effectiveness of tannin as a corrosion inhibitor for carbon steel in nitric acid solutions. The corrosion rate is determined using the Tafel method, whereas the corrosion mechanism is predicted by cyclic voltammetry. The results showed that tannin is ineffective to inhibit carbon steel corrosion in nitric acid solution. The carbon steel corrosion reaction in nitric acid solution, with or without tannin addition, is reversible, involving single step oxidation-reduction reaction, resulting stable corrosion product, and not forming any passivation.Keywords: carbon steel, corrosion, inhibitor, nitric acid, tannin
Sex education from the perspective of adolescent students, teachers, and managers of Elementary School in Recife, Pernambuco, Brazil
Authors: Neto de Menezes Maria Lucia , Figueiroa Maria das Neves , Neto Waldemar Brandão , Oliveira Júnior Gentil Paiva de , Lourenço Bruna Layza Gonçalves , Falcão Thaísa Cristina Xavier Soares Arruda , Barbosa Bárbara Albuquerque
Published: January 2020

Sexuality in adolescence is a major focus of interest and concern for parents and educators, thus family and school involvement is indispensable for adolescent sex education. This article analyzes educational scenarios, themes, and difficulties related to sex education, from the perspective of adolescent students, managers, and teachers from Brazilian public schools. This is a cross-sectional, exploratory, and descriptive survey, developed in 5 schools from the 2nd political-administrative region (PAR) of Recife, Pernambuco, Brazil. The sample consisted of 196 individuals (168 teenagers, 19 teachers, and 9 managers) and data was obtained through interviews, conducted in September and October 2017. The results indicate that the school infrastructure has deficiencies in relation to: living spaces, teaching scenarios, teacher education, dialogue with families, and integration with other teaching and health institutions. All this contributes to the persistence of sex education as a theme of biology-based classes. It is concluded that psychological, cultural, and relational aspects of healthy and safe sexuality persist as knowledge gaps according to the teenagers themselves, something which indicates the need to expand spaces for dialogue and embracement of human diversity within the school environment.
Renatūralizuotos Vašuokos upės vandens kokybės kaitos įvertinimas
Authors: Gervytė Justina , Chkhvimiani Mariami , Bagdžiūnaitė-Litvinaitienė Lina
Published: January 2020

Straipsnyje analizuojamas renatūralizuoto Vašuokos upelio vandens kokybės kaitos vertinimas 1 km ruože. Upės tiriamajame ruože yra įrengtos natūralios inžinerinės priemonės, tokios kaip akmenų metiniai, rąstai, medžių nuovartos. Vandens kokybei indentifikuoti buvo nagrinėjami fiziniai-cheminiai paramentrai (nitratų azotas, fosfatinis fosforas bei ištirpęs deguonis). Nitratų azoto koncentracija tiriama kadmio mažinimo metodu, fosfatinio fosforo-askorbo rūgšties metodu, o ištirpusio deguonies kiekis – pagal Winklerio metodą. Mėginiai buvo imami pavasarį, vasaros pradžioje ir pabaigoje iš 9 tiriamųjų taškų. Taškai pasirinkti taip, kad būtų ištirtas visas pasirinktas upės ruožas. Tam, kad būtų tinkamai įvertinta vandens kokybė, mėginiai imti upės tekėjimo kryptimi. Straipsnyje yra pateiktas išsamus Vašuokos upelio tyrimas, įvertinta vandens kokybės kaita renatūralizuotame upės ruože.
Mažų buitinių nuotekų kiekių valymo tyrimai ir analizė
Authors: Gelažiūtė Gabija , Mažeikienė Aušra
Published: January 2020

Net maži, individualūs buitinių nuotekų valymo įrenginiai turi būti efektyvūs ir šalinti iš nuotekų azoto bei fosforo junginius. Aplinkosauginiai reikalavimai griežtėja, nuo 2019 m. lapkričio mėnesio įsigalios Nuotekų tvarkymo reglamento pataisos, pagal kurias mažuosiuose (kurie per dieną išvalo iki 5 m3 nuotekų) valymo įrenginiuose bus privaloma iš nuotekų pašalinti azoto junginius iki 25 mgN/l, o fosforo junginius – iki 5 mgP/l. Individualiais įrenginiais išvalomų nuotekų likutinė tarša beveik nekontroliuojama, nėra sukaupta duomenų apie tokių įrenginių darbo efektyvumą. Reikalingi išvalytų nuotekų kokybės tyrimai ir jų analizė. Straipsnyje analizuojami keleto gamintojų (,,Traidenio‘‘, ,,Dinaito‘‘ ir ,,August‘‘) platinamais mažiausiais biologinio valymo įrenginiais pasiekiami nuotekų išvalymo rodikliai, esant realioms įrenginių eksploatavimo sąlygoms. Tiriami išvalytų nuotekų mėginiai (matuojamos ChDS, BDS7, nitritų azoto, nitratų azoto, amonio azoto ir fosfatų fosforo koncentracijos) bei įrenginių veiklusis dumblas (atliekama mikrobiologinė analizė). Tyrimų rezultatai lyginami su norminiais reikalavimais.
Šiaurės Lietuvos šachtinių šulinių vandens kokybės tyrimas
Authors: Dabužinskaitė Ginta , Kerienė Ilona , Mažeikienė Aušra
Published: January 2020

Lietuvoje apie 700 tūkst. gyventojų vis dar iš šachtinių šulinių tebevartoja geriamąjį vandenį, kurio kokybė neužtikrina saugaus jo vartojimo. 2017–2018 metais tirta Šiaulių miesto, rajono ir apskrities šachtinių šulinių vandens kokybė. Nustatytos geležies, fosfatų, fluoridų, chloridų, bromidų, nitritų, nitratų, sulfatų jonų koncentracijos ir bendrasis vandens kietis. Nustatyta, kad 60 % tirtųjų Šiaulių miesto ir apskrities šachtinių šulinių vandens kokybė pagal nitratų ir geležies jonų koncentracijas neatitinka HN 24:2017 higienos normos reikalavimų. Didžiausia geležies jonų koncentracija nustatyta Šiaulių rajone, sodų bendrijos šulinio vandenyje (214 μg/l), kur iš viso 10 % tirtųjų mėginių viršijo HN 24:2017 higienos normos reikalavimus. Šiaulių miesto gyventojai, vartojantys vandenį iš šachtinių šulinių, turėtų atkreipti dėmesį į vandens kokybę dėl didelės (daugiau, kaip 300 mg/l) nitratų jonų koncentracijos, iki 6 kartų viršijančios HN 24:2017 higienos normos reikalavimus. Gyventojams rekomenduojama aktyviau jungtis prie centralizuotų vandentiekio tinklų arba periodiškai tikrinti geriamojo vandens kokybę.
Filling level measurements of mixed waste bins using low power iot sensors and LoRa WAN technology
Authors: Inasaridze Nino , Vaišis Vaidotas
Published: January 2020

The article deals with sensor-related solutions to improve waste collection and monitoring in public waste bins. Availability of use of an inexpensive monitoring system for measurement process was tested. The system consists of wireless nodes that use ultrasonic sensors to measure the empty space in the waste bins. A sensor gateway based on Long Rage Wide Area Network (LoRaWAN) protocol was used. Purpose of this work was to describe the new sensor node typology based on low-power and low-cost components. The article analyses the architecture of nodes in detail, focusing on energyefficient technologies and policies to extend battery life by reducing energy consumption through hardware and software optimization. Measurements were performed at five points in two size of containers with different two levels of filling and mixed type of waste. The results show that existing technologies are mature enough to create and deploy inexpensive additional sensors for outbound bins and that such a system can provide the necessary insights on how to optimize waste collection processes and avoid overflowing containers.
Theoretical predictions of sound scattering coefficient and sound diffusion coefficient from quadratic residue diffusers
Authors: Khrystoslavenko Olga , Grubliauskas Raimondas
Published: January 2020

Quadratic residue diffuser (QRD) is a device that distributes the acoustic energy of intense reflections by its spatial and temporal dispersion. The quadratic residue diffuser consists of a series of wells of different depths and the same width. Optimal diffusion is very important for perceiving musical sound and eliminating unwanted acoustic effects e.g. echoes. For the purpose to determine the optimal diffusion, Schroeder used mathematical number sequences allowing to diffuse the sound in a semicircular pattern from the devices. In this paper, the presented quadratic residue diffuser modeling method is presented. Result of theoretical modeling at a frequency of 500 Hz was obtained. The estimated width of the wells is 9.4 cm. The sound scattering and sound diffusion coefficient different number of the diffusor wells were researched. It was obtained that with an increasing number of wells of the diffuser leads to an increment in sound diffusion at the design frequency for diffuser the same width sequences.
Fluoridų šalinimo iš geriamojo vandens naudojant sorbentus tyrimas
Authors: Siaurusevičiūtė Irma , Albrektienė Ramunė
Published: January 2020

Įvairiose pasaulio vietose geriamajame vandenyje yra randamos padidėjusios fluoridų koncentracijos (Argentina, JAV, Egiptas, Jordanija, Turkija, Iranas, Irakas, Kinija, Australija, Naujoji Zelandija, Japonija, Kanada, Saudo Arabija ir kt.). Vakarų Lietuvos Skuodo ir Plungės, Telšių, Palangos bei Klaipėdos rajonų vandenviečių požeminio vandens gręžiniuose fluoridų koncentracija siekia apie 3 mg/l, Kretingos rajone – iki 6–6,5 mg/l. Pagal vandens higienos normą HN 24:2017 fluoridų koncentracija geriamajame vandenyje turi neviršyti 1,5 mg/l. Per didelis fluoro kiekis sukelia dėmėtų dantų ligas, dantų skeleto fluorozę, moterims anksti pasireiškia osteoporozė. Šiame darbe yra tiriamas fluoridų šalinimo efektyvumas iš dirbtinio vandens su padidėjusiomis fluoridų koncentracijomis, naudojant sorbentus: geležies prisotintas išdžiūvas ir panaudotus kavos tirščius. Nustatyta, kad geležies paplavų išdžiūvos fluoridus pašalina 0,27–93,10 % efektyvumu, naudojant panaudotus kavos tirščius pasiekiamas 0,4–57,97 % fluoridų pašalinimas. Atlikti tyrimai parodė, kad efektyviausiai fluoridus iš tiriamojo vandens šalina geležies paplavų išdžiūvos. Naudojant skirtingus geležies paplavų išdžiūvų kiekius ir esant skirtingai kontakto trukmei, fluoridų koncentracija tiriamajame vandenyje po valymo neviršija leistinų geriamojo vandens normų (1,5 mg/l), todėl sorbcijai galima naudoti mažiausią geležies paplavų išdžiūvų kiekį – 40 g/l. Pirmajame etape su sorbentų dozėmis 1, 2, 3, 4, 5 ir 6 g/l, efektyviausias fluoridų išvalymas pasiektas, kai kontakto trukmė – 120 min, o antrajame tyrimų etape, kai sorbentų dozės 10, 20, 30, 40 ir 50 g (arba 60 g) – 150 min.
Tretinio nuotekų valymo filtruojant per ceolito, kriauklelių ir Filtralite P užpildus tyrimas ir analizė
Authors: Starenko Julita , Mažeikienė Aušra
Published: January 2020

Šiandien itin svarbi vandens taršos fosforo ir azoto junginiais problema. Kai reikiamas nuotekų išvalymo lygis nepasiekiamas pagrindinio valymo grandyje, taikomas tretinis valymas. Straipsnyje tiriamas trijų sorbentų – gamtinio ceolito, kriauklelių ir Filtralite P – efektyvumas šalinti iš nuotekų biogenines medžiagas. Biologiniu būdu išvalytos nuotekos iš eksploatuojamų įrenginių tirtos VGTU Aplinkos apsaugos ir vandens inžinerijos katedros laboratorijoje, jų tarša amonio azoto bei fosfatų fosforo junginiais mažinta filtruojant per sorbcinius filtrų užpildus eksperimentiniame stende. Matuojamos ir vertinamos valomų nuotekų teršalų koncentracijos, filtravimo greitis, sorbcinių medžiagų geba sulaikyti NH4-N ir PO4-P. Atlikus eksperimentinius tyrimus nustatyta, kad fosfatų fosforą geriausiai šalino Filtralite P užpildas (šalinimo efektyvumas iki 70 %), o amonio azotą – ceolito užpildas (šalinimo efektyvumas iki 95 %).
Geležinkelio transporto talpos plovimo vandens sorbcinio valymo vertinimas
Authors: Sviackevičiūtė Inga , Valentukevičienė Marina
Published: January 2020

Straipsnyje nagrinėjamas sorbcinis geležinkelio transporto talpyklų plovimo vandens valymas. Tyrimo metu buvo išbandytas mineralinis sorbentas, kuris buvo dozuojamas į tiriamąjį vandenį, esant 21 °C temperatūrai, kitam bandymui – 70 °C ir užtikrinama 30 minučių kontakto trukmė. Vanduo tyrimams atlikti buvo paimtas iš geležinkelio transporto talpyklų plovimo vandens kaupimo talpyklos. Atlikus eksperimentus buvo nustatyta, kad veikiant sorbentui drumstumo mažinimo efektyvumas buvo 64 %, spalvingumo iki 56 % bei bendrosios geležies koncentracijos iki 68 %. Tyrimo metu buvo matuojamas pH, temperatūra, cheminis deguonies suvartojimas, sunkiųjų metalų (švino ir vario) koncentracijos, skendinčiosios medžiagos, naftos koncentracija.
Experimental study of tertiary treatment of wastewater using zeolite
Authors: Tabatadze Nino , Vaiškūnaitė Rasa , Mažeikienė Aušra
Published: January 2020

Small individual household wastewater treatment plants not always operate well. Consequently, the concentrations of ammonium nitrogen and phosphate phosphorus are exceeded. The aim of the work was to examine the zeolite as a wastewater tertiary treatment material and propose environmentally friendly ways to solve fresh water problem. During experiment zeolite filter material was tested. In the article is analyzed zeolite filtering efficiency of nutrient removal from wastewater. Zeolite filler most effective was against ammonium nitrogen (99.9–10.1%) and relatively less effective against phosphate phosphorus (51.2–4.9%).
Competitiveness and Polycentrism for SMEs in Bogotá Region, Colombia
Authors: Blanco Luis Armando , Duran Fabio Fernando Moscoso , Libreros Julián Marcel
Published: January 2020

This chapter studies the dynamics of Bogotá Region based on the New Economic Geography and the recent works on economic development in two big dimensions: the economic and the spatial structure; that is, productivity and polycentrism. The central thesis, supported on an econometric exercise for SMEs in 20 cities in Bogotá-Sabana region, is that with greater strength in the interior of Bogotá and less in the city region, a transition from monocentrism to functional polycentrism is consolidating. Krugman's Edge Cities model concludes that polycentrism comes from a process of spontaneous self-organization and produces a territorial order according to the mysterious ZIP law and consistent with efficiency, equity, and sustainability.
Research Methods for the Study of Small and Medium-Sized Enterprises
Authors: Hernández-Sampieri Roberto , Méndez-Valencia Sergio
Published: January 2020

Small and medium-sized enterprises (SMEs) have become a subject of study by themselves, given the wide range of topics revolving around research in this area, which can be easily observed while searching for information in the most prestigious databases in the world. This chapter presents the characteristics of quantitative, qualitative, and mixed-research methods applied in the study of SMEs, since the understanding of these methods is a matter of vital importance to better analyze the particularities, environment, needs, and other relevant aspects of small- and medium-sized enterprises. Likewise, it is important to display the most relevant and significant variables to be included in the study of this kind of organizations.
What Compels Journalists to Take a Step Back?
Authors: Abir Janina Islam , Shamim Tanbir Farhad
Published: January 2020

Reports by international organizations suggest that physical violence and threats against journalists and bloggers continued with impunity in Bangladesh, resulting in the country being ranked as 146 in the World Press Freedom Index 2018. Considering the increasing incidents of violence against journalists and attacks on media freedom, this chapter specifically aims to shed light on Bangladeshi laws and policies, which are related to media freedom and to protect media from crime against journalists. Relying on Beata Rozumilowicz's concept of media reform and stages of media reform, the study urges that Bangladesh is in under the rule of democratic rule for years that symbolizes the primary transition stage. However, the enactment of statutes on digital media, access to information, defamation, and so on epitomize the pre-transition stage of the media reform concept. Hence, the study questions the legal and media structure of Bangladesh with the historical and document analysis of laws and policies.