1,720,962 research outputs found
PENERAPAN SIMULASI NUMERIK PENENTUAN DEFLEKSI PADA PROFIL HS- 75
No full textSalah satu profil baja ringan yang mempunyai bentuk hat (topi) adalah HS - 75. Profil ini sering digunakan pada rangka atap suatu bangunan. Penggunaan baja ringan sebagai rangka utama suatu atap merupakan hal yang sangat penting diaplikasikan mengingat penggunaan kayu yang mempunyai beberapa kekurangan, yaitu rangka kayu mudah lapuk sehingga mempunyai umur yang tidak terlalu panjang dan kayu bersifat getas sehingga mudah patah. Sedangkan profil HS- 75 mempunyai beberapa kelebihan yaitu berat dari profil lebih ringan, mudah dipasang dan dipindahkan dan lapisan dari aluminium yang membuat tahan terhadap korosi. \ud
Penelitian ini bertujuan untuk menganalisis defleksi yang terjadi pada profil HS - 75 dengan menggunakan metode elemen hingga dan simulasi pada Inventor Ansys.\ud
Tumpuan yang digunakan dalam penelitian adalah tumpuan engsel ??? rol, menggunakan profil baja ringan HS-75 dengan panjang 1500 mm dengan tebal 0,8 mm. Alat yang digunakan dalam penelitian ini adalah Komputer yang dilengkapi dengan Software Inventor Ansys, untuk mengolah dan mensimulasikan data, Alat tulis, untuk mencatat data yang diperoleh dari pengolahan data, printer untuk mencetak data.\ud
Metode penelitian ini melakukan perhitungan manual secara metode elemen hingga dan menggunakan software Inventor Ansys secara simulasi. Pada metode elemen hingga, rumus defleksi diperoleh dengan cara menurunkan persamaan defleksi, kemudian menentukan defleksi yang terjadi sesuai dengan syarat jenis tumpuan yang digunakan yaitu tumpuan engsel ??? rol. Sedangkan pada simulasi Inventor Ansys, melalui tahapan seperti berikut : membuat sketch seperti gambar yang direncanakan; save part dengan nama hat section; lalu masuk ke menu assembly; mencari nama hat section; masuk ke beam and column; menyimpan data (save) dengan nama analysis hat; menentukan jenis material yang digunakan pada kolom material; pindah ke tab beam calculation untuk menentukan beban; isikan nilai pada kotak dialog radial force sesuai gambar yang direncanakan lalu klik Ok; pindah ke tab beam graphs dan masukkan data yang dibutuhkan, pilihlah dalam arah XZ Plane; selesai.\ud
Hasil penelitian diperoleh bahwa baja ringan dengan profil HS- 75 dapat menahan beban maksimum sebesar 1862 N dengan besar defleksi 2,6178 mm. Hal ini terjadi baik pada perhitungan metode elemen hingga maupun pada simulasi pada Inventor Ansys. Berdasarkan data tersebut, maka dapat disimpulkan bahwa baja ringan profil HS- 75 layak dijadikan material pengganti dalam sistem truss menggantikan material kayu
Going Beyond Counting First Authors in Author Co-citation Analysis
Get PDFThe 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
Get PDF“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
Get PDFWe 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
Controlling Unmanned Surface Vehicle Rocket using GPS Tracking Method
Get PDFAn unmanned surface vehicle (USV) is
operated on the water surface for specific purposes. USV can be used in waters
that cannot be entered by crewed boats, such as environments with high levels
of threat or that are contaminated by nuclear, biological, or chemical waste.
USVs can also be used for surveys in shallow waters, escorting military
weapons, collecting environmental data, and coordinating with other underwater
vehicles such as automated underwater vehicles. This study designs and develops
simple USV rockets for maneuvering on the water surface. First, a simple USV
system is designed. Next, mechanical and electronic components are selected,
and the control program is implemented using the Arduino Mega 2560
microcontroller. Finally, the USV motion kinematics are analyzed, rocket thrust
force is tested, and torque generated by the electric ducted fan (EDF) motor is
measured. Ultimately, a rocket system with weight of 3920 g and length, width,
and height of 720 mm, 500 mm, and 420 mm, respectively, is developed. The USV
rocket is driven by an EDF motor with voltage and current of 1600 kV and 160 A,
respectively, an electronic speed control, 6X Turnigy FHSS remote control, and
two 18.5 V Li-Po 5500 mAh batteries as a power source. The USV has a maximum
thrust of 40.7 N with torque of 1.41 Nm. Kinematics parameters such as angular
acceleration and linear acceleration were also determined
Dispelling the Myths Behind First-author Citation Counts
Get PDFWe 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
Performance of Undershot Water Wheel with Bowl-shaped Blades Model
Get PDFWater power is a
type of power obtained from the force created by flowing water. Energy created
from flowing water can be harnessed as a form of mechanical energy that can be
utilized to generate electricity. Undershot water wheels have been extensively
used to take advantage of the water flowing from rivers or waterfalls. This
research was conducted by using water turbines with bowl-shaped blades made of
iron and acrylic. The diameter of the turbines was 30 cm, and the diameter of
the blades was 9 cm.
Four, six, and eight blades were used in the three water turbines for this
research. The blades were discharged and loaded to turn the turbine to generate
force. The results of the study showed that the highest efficiency (? = 74.22%) was found in the six-blade
turbine with a discharge of 0.01228 m3/s.
It can be concluded that water turbines with bowl-shaped blades can be used as
an alternative energy in small-scale electric generators. 
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