1,720,958 research outputs found
ALAT DAUR ULANG BOTOL PET MENJADI BAHAN BAKU FILAMEN UNTUK 3D PRINTER
Full text linkPlastic bottles made from Polycarbonate (PC) are widely used for mineral water packaging. The use of these materials results in a large amount of plastic-type waste, which is bad for the environment if not handled properly. The plastic bottle packaging is only recommended for one-time use. Plastic bottles made from PET can be processed and used as raw material for 3D printers. The processing of these plastic bottles uses microcontroller technology, which is made to adjust the temperature for heating the PET bottle material, as well as to control the rotation of the servo motor used to push and pull the rolling material. The control method used uses the PID theorem, which is regulated manually by trial and error, where this research only tests how much temperature is needed and the motor pull speed (RPM) to produce raw materials for 3D printers. The expected diameter of the process results has been determined with the size of the nozzle diameter used, which is 1.7 mm. From the test results after the tool was made, plastic bottles that had been cut like ribbons with a width of 1 mm, a heating treatment of 170°C with a tensile speed by adjusting the speed of 20.8% and 40.8% got the best results visually, smooth, clear and bonding is pretty good.Botol plastik yang berbahan Polyetheylene Terephtalate (PET) banyak dipakai sebagai kemasan air mineral. Penggunaan material tersebut berujung banyaknya limbah jenis plastik yang berdampak buruk bagi lingkungan jika tidak ditangani dengan benar. Botol plastik kemasan tersebut hanya direkomendasikan satu kali pemakaian. Botol plastik yang berbahan PET dapat diolah dan dijadikan material bahan untuk 3D printer. Pengolahan botol plastik ini menggunakan teknologi microcontroller yang dibuat untuk mengatur besaran suhu untuk memanaskan material botol berbahan PET tersebut, juga untuk mengendalikan butaran motor servo yang digunakan untuk mendorong dan menarik bahan di penggulungan. Metode kontrol yang digunakan menggunakan teorema PID yang diatur secara manual trial and error, dimana penelitian ini hanya menguji seberapa besar suhu yang dibutuhkan dan kecepatan tarik motor (RPM) sehingga menghasilkan bahan baku untuk 3D printer. Diameter yang diharapkan dari hasil prosesnya sudah ditentukan dengan ukuran diameter nozzle yang dipakai yaitu 1,7 mm. Dari hasil uji coba setelah alat dibuat, botol plastik yang telah dipotong seperti pita dengan lebar 1 mm, diperlakukan pemanasan 170°C dengan kecepatan tarik dengan mengatur kecepatan 20,8% dan 40,8% mendapatkan hasil yang terbaik secara visual, halus, bening dan kerekatan cukup baik
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Variations on the Author
Full text link“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
Appropriate Similarity Measures for Author Cocitation Analysis
Full text linkWe provide a number of new insights into the methodological discussion about author cocitation analysis. We first argue that the use of the Pearson correlation for measuring the similarity between authors’ cocitation profiles is not very satisfactory. We then discuss what kind of similarity measures may be used as an alternative to the Pearson correlation. We consider three similarity measures in particular. One is the well-known cosine. The other two similarity measures have not been used before in the bibliometric literature. Finally, we show by means of an example that our findings have a high practical relevance.information science;Pearson correlation;cosine;similarity measure;author cocitation analysis
Dispelling the Myths Behind First-author Citation Counts
Full text linkWe conducted a full-scale evaluative citation analysis study of scholars in the XML research field to explore just how different from each other author rankings resulting from different citation counting methods actually are, and to demonstrate the capability of emerging data and tools on the Web in supporting more realistic citation counting methods. Our results contest some common arguments for the continued
use of first-author citation counts in the evaluation of scholars, such as high correlations between author rankings by first-author citation counts and other citation
counting methods, and high costs of using more realistic citation counting methods that are not well-supported by the ISI databases. It is argued that increasingly available digital full text research papers make it possible for citation analysis studies to go beyond what the ISI databases have directly supported and to employ more
sophisticated methods
Perancangan Dan Pembuatan Mesin 3D Printer Tipe Cantilever
Full text linkTeknologi 3D printing termasuk dalam metode manufaktu rbaru yang disebut dengan metode additive manufacturing. Metode ini mempunyai cara kerja menumpuk material untuk membuat sebuah objek 3 dimensi. Penelitian dalam bidang desain dan assembly mesin 3D printer masih belum banya kdilakukan. Pada umumnya, mesin-mesin 3D printer yang digunakan memiliki paling tidak 5 motor stepper, yaitu sumbu X 1 buah, sumbu Y 1 buah, sumbu Z 2 buah serta motor ekstruder 1 buah. Paper ini akan membahas mengenai alternative desain mesin 3D printer FFF dengan model cantilever yang menggunakan 4 motor stepper sehingga lebih hemat komponen. Proses desain dan assembly 3D printer tipe cantilever menghasilkan mesin dengan area kerja 200 x 200 x 200 mm dan ketelitian 0,1 mm. Mesin 3D printer yang didesain memiliki komponen utama berupa komponen mekanik dan elektrik. Komponen mekanik terdiri dari frame, linear guide, bracket, leadscrew, pulley dan timing belt. Komponen elektrik terdiri dari controller, lcd, motor stepper, limit switch, soket serta power supply. Dengan meminimalisir jumlah motor stepper yang digunakan, maka desain 3D printer tipe cantilever dinilai lebih ekonomis dengan desain yang minimalis. Mesin seperti ini cocok digunakan untuk kegiatan-kegiatan yang bersifat mobile. 3D printer ini kedepan akan dimanfaatkan untuk melakukan pelatihan kepada masyarakat untuk memperkenalkan teknologi manufaktur baru, yaitu proses cetak 3 dimensi
koamabayili/VECTRON-author-checklist: VECTRON author checklist
No full textWe have done our best to complete the author checklist relating to the use of animals in the hut study. Note that the objective for the hut study was to evaluate the IRS treatment applications for residual efficacy against Anopheles mosquitoes, including the local An. coluzzii mosquito population. Cows were only used to attract mosquitoes into the huts and no tests were carried out directly on the cows. The author checklist is intended for use with studies where experiments are carried out on animals, which is why we have had such difficulty in completing this for the hut study, as many of the questions do not relate to how the cows were used
Author-wise bibliometric analysis based on entropy.
No full textAuthor-wise bibliometric analysis based on entropy.</p
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