Articles
Penghitungan Beban Kritis pada Struktur Kolom Kontinu dengan Dua Bentangan akibat Pembebanan Secara Aksial
Eka Satria;
Nusyirwan Nusyirwan;
Muhammad Irfan
METAL: Jurnal Sistem Mekanik dan Termal Vol 2, No 2 (2018)
Publisher : Department of Mechanical Engineering, Universitas Andalas
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DOI: 10.25077/metal.2.2.7-13.2018
This paper is aimed to determine the critical buckling load of continous column with two spans under axial loading. Firstly, the critical buckling loads is calculated theoretically based on concept of solid mechanic. The calculation is conducted for various ratio of L1/L2. This ratio shows a comparison of two span lengths. The used ratios in this calculation are L1/L2= 1/3,1/2, 2/3, 1/1, 3/2, 2/1, and 3/1. The critical buckling loads is calculated based on elastic analysis. For practical application, the results then are approached by regression technique of a least square method to find the best fit of design equation. Later, this equation is recommended as a practical equation in determining the critical buckling of continous column with two spans under axial loading.
Kaji Perbandingan Karakteristik Respon Dinamik Suspensi Sepeda Motor dengan Memakai Peredam Viscous Oli Sintetis dan Minyak Nabati
N Nusyirwan
METAL: Jurnal Sistem Mekanik dan Termal Vol 1, No 2 (2017): Jurnal Sistem Mekanik dan Termal (METAL)
Publisher : Department of Mechanical Engineering, Universitas Andalas
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DOI: 10.25077/metal.1.2.133-141.2017
The motorcycle is a vehicle which is widely used by people today, especially in the narrow streets. This vehicle is able to meet the needs of users because it is cheap, fuel-efficient is also very dynamic to reach places that are difficult to reach by four-wheeled vehicles that have large dimensions. In addition to the many advantages of two-wheeled vehicles should also be taken into account in terms of comfort and safety. Safety factor will depend on many factors, other than humans as a rider, vehicle reliability and the quality level of the road is an important safety factor. Factors vehicle will be in direct contact with the road in its path. Regarding the main factor for the safety of the road is how the vehicle is still stable when it fell into a deep hole or a very rough road. Suspension as one of the main tools to respond to the shock loads on a motorcycle is the main factor that should be taken into account. Types of suspension are used to reduce response style and shock will be felt directly by passengers. This is one study which the suspension is an extremely important characteristic studied. One that plays a role in the election of a suspension damper oil. Oil damper as viscous dampers shock loads can convert into friction and heat. Viscous good silencer is to transfer mechanical energy into heat as much as possible, without changing the characteristics of the damper oil itself. Oils tested, there are three types of commercial oil chosen by the suspension manufacturers. This study was conducted to replace oil with vegetable oil palm oil CPO output can reduce the amplitude of 9.2 cm for shock loads of 20 kg with a height of fall of 3 m. Fall height of 3 m damping ratio of vibration damper formed by CPO was 0.41.
Metode Pengering Gabah Aliran Massa Kontinu Sebagai Pengering Alternatif Pada Musim Penghujan Dengan Sumber Energi Dari Cahaya Lampu Mono Kromatis
Nusyirwan Nusyirwan
METAL: Jurnal Sistem Mekanik dan Termal Vol 2, No 1 (2018)
Publisher : Department of Mechanical Engineering, Universitas Andalas
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DOI: 10.25077/metal.2.1.47-55.2018
In the rainy season, rice grain from the harvesting field cannot be dried properly. This condition is due to sunlight being blocked up by the cloud therefore the sunlight intensity on the earth surface is small. As a consequence many farmers become loss because this low quality rice is sale at a lower price. To overcome the above problems, it is necessary to make a dryer that not directly depend on the solar energy. In this research, a method for rice drying using light from monochrome lamp is proposed. The dryer consist of a silinder-shaped container which is equipped whith a stirer that can be adjusted according to the desired speed. In the drying chamber, hot air that regulated in the drying room is produced by incandescent lamp. The drying result obtained from this dryer using 40 rpm rotation speed reaches an absolute dry percentage of rice at equivalent of 14 %. While for stirrer rotation 50 rpm and 60 rpm the drying percentage is 8 % and 5 %. From these results, it can be concluded that the best condition for the drying process is obtained for stirrer rotation speed 40 rpm.
Penghitungan Beban Kritis pada Struktur Balok-Kolom Akibat Pembebanan Secara Aksial dan Lateral Berbasiskan Metode Beda Hingga
Eka Satria;
N Nusyirwan;
Deri Yunifki
METAL: Jurnal Sistem Mekanik dan Termal Vol 1, No 2 (2017): Jurnal Sistem Mekanik dan Termal (METAL)
Publisher : Department of Mechanical Engineering, Universitas Andalas
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DOI: 10.25077/metal.1.2.117-124.2017
This paper is aimed to determine the critical buckling load of the beam-column structures for practical applications. Firstly, the critical buckling loads is calculated numerically based on finite difference method. For geometrical modeling, the structures are supported in three types of supports; pinned-roller, fixed-free, and fixed-pinned. Then, a geometry of the beam is varied in variation of slenderness ratio. The load is given in types of uniform distribution load, q, laterally and a concentrated load, P, axially. Using a computational program, the relationships of P/q to slendernes ratio, l, for all models are determined. The results then are approached by regression technique of a least square method in order to find a the best fit of equation. This equation is recommended as a practical equation for determining the critical buckling of the beam-column structures under variation of types of supports, slenderness ratio and rasio P/q.
Online learning satisfaction in higher education: what are the determining factors?
Sri Suhandiah;
Fendy Suhariadi;
Praptini Yulianti;
Ratna Wardani;
Yurilla Endah Muliatie
Jurnal Cakrawala Pendidikan Vol 41, No 2 (2022): Cakrawala Pendidikan (June 2022)
Publisher : LPMPP Universitas Negeri Yogyakarta
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DOI: 10.21831/cp.v41i2.35724
Covid-19 pandemic crisis has required the implementation of comprehensive online learning in Indonesia, including in the higher education institutions. Changes in the conventional way of face-to-face learning to online one provide both positive and negative responses, which will affect student learning satisfaction. This research aims to determine student satisfaction with the online learning which is associated with perceived technological complexity, student learning experience, online learning readiness, and presence of lecturers in online learning activities. This research employed a quantitative approach. Data were collected utlizing a google online questionnaire distributed through a network of lecturers. The samples were 439 students from state and private higher education institutions spreading across eight islands in Indonesia. Statistical analysis utilized the Structural Equation Model (SEM) in Stata 15. The results show that online learning satisfaction is positively influenced by student experience, online learning readiness, and the presence of lecturers in online learning. Moreover, online learning readiness can mediate student experience and online learning satisfaction but unable to mediate technology complexity and online learning satisfaction. These findings add to the literature on online learning satisfaction and provide direction for the solution of problems on online learning satisfaction. The proposed suggestion to higher education institutions is to encourage the development of online-based collaborative models and to provide a continuous experience for students.
Digital-Based Economic Recovery Program For MSMEs in Indonesia
Febrianur Ibnu Fitroh Sukono Putra;
Herry Subagyo;
Risanda A. Budiantoro;
Awanis L. Haziroh
Jurnal Organisasi dan Manajemen Vol. 18 No. 1 (2022)
Publisher : LPPM Universitas Terbuka
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DOI: 10.33830/jom.v18i1.1763.2022
Purpose - The recent Covid-19 pandemic has stagnated the majority of economic sectors, especially Micro-enterprises. This is observed in the inability of most Micro-enterprises to develop during the period, thereby, leading to bankruptcy and a change in sales strategy through a digitalization scheme to obtain more comprehensive marketing access. Therefore, this research was conducted to initiate the ideal e-marketing adoption model for small micro-enterprises. Methodology - This research uses qualitative exploration approach. The samples were selected using snowball sampling technique by moving gradually from one individual to another. Moreover, the analyzed through data collection, reduction, presentation, and conclusion. Findings - The results showed that there are two categories of digital business programs which include startup training and development as well as scale-up training and development. The main contribution of the implementation of the Digital-Based Economic Recovery Program is facilitating the micro-enterprises in Indonesia accessibility to become participants in sustainable empowerment, increasing the micro-enterprises in Indonesia business performance capacity, and encouraging the micro-enterprises competitiveness increased to penetrate the suitable international market standards. Originality - The program is expected to serve as a role model based on mutual relations to ensure optimal empowerment of Micro-enterprises supported by the use of appropriate technology.
Pemberdayaan Ekonomi Masyarakat Industri Rumah Tangga Melalui Batik Bakau
Tito Aditya Perdana;
Febrianur Ibnu Fitroh Sukono Putra;
Risanda Alirastra Budiantoro
Surya Abdimas Vol. 5 No. 4 (2021)
Publisher : Universitas Muhammadiyah Purworejo
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DOI: 10.37729/abdimas.v5i4.1328
Batik sudah lama dikenal sebagai karya bangsa Indonesia. Ditinjau dari sumber diperolehnya zat warna tekstil dibedakan menjadi dua yaitu zat warna sintetis dan zat warna alam. Batik Mangrove merupakan batik yang menggunakan pewarna alam dikarenakan bagian mangrove yang dimanfaatkan sebagai pewarna adalah limbah atau bagian tanaman yang sudah tidak terpakai. Persoalan utama yang dihadapi oleh Batik Bakau sebagai industri rumah tangga mitra sasaran kami adalah belum adanya awareness produk yang diproduksi oleh produsen kepada konsumennya. Permasalahan berikutnya adalah kurang optimalnya penggunaan platform market place yang sudah dimiliki untuk memasarkan produk yang sudah dibuat oleh industri rumah tangga Batik Bakau. Diperlukan juga pembuatan desain media sosial yang baik dan menarik bagi konsumen agar bisa membuat usaha rumah tangga ini lebih berdaya. Atas permasalahan mitra sasaran kami, maka kegiatan yang akan dilakukan antara lain: Penyuluhan dan sosialisasi program kemitraan masyarakat, Pelatihan pembentukan mindset potensi pemanfaatan pemasaran digital, Penguatan platform digital guna memfasilitasi pelaku usaha batik bakau memasarkan produknya, Pelatihan branding dan packaging guna meningkatkan kualitas SDM pelaku usaha industri rumah tangga batik bakau, Pelatihan pemasaran digital melalui platfom digital yang telah disediakan guna meningkatkan awareness, minat, dan penjualan batik bakau.
METODE PENURUNAN RESPON DINAMIK SISTEM POROS-ROTOR DENGAN PEREDAM VISCOUS ROTARY
Nusyirwan Nusyirwan
Jurnal Ilmiah Teknik Mesin POROS Vol 12, No 2 (2014): Jurnal Ilmiah Teknik Mesin POROS
Publisher : Program Studi Teknik Mesin Universitas Tarumanagara
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DOI: 10.24912/poros.v12i2.563
Abstract: Viscosity or viscosity is one of the quantities that are very important in the analysis of the behavior and movement of fluids that come into contact with other objects such as solids {solid body). Viscous dampers can be used to reduce the amplitude of the response due to the unbalanced mass, rotation critically, noise and shock loads. Absorbers working with fluid film bearing securities which are placed at a certain point, which is connected to the shaft-rotating rotor. Certain viscosity fluid will be forced to pass through a narrow slit with a certain pressure that can absorb the energy supplied by the shaft, this damping effects that can provide resistance to the rotor shaft system because the fluid has a linear damping and damping effect histeriktik. Viscous dampers can be used to reduce vibration amplitude response at a fixed price in accordance with the physical nature of the damper, the use of viscous dampers are widely used to control engine speed and turbine rotational speeds are like a helicopter rotor. From the test we can produce the damping effect on the engine rotation can reduce the response time domain vibration with an amplitude reduction of approximately 60% for the damping ratio ζ = 0.5.
Modern Wound Care Application: A Literature Review
Khaerotib;
Yuly Peristiowati;
Ratna Wardani
International Journal of Science and Society Vol 3 No 1 (2021): International Journal of Science and Society (IJSOC)
Publisher : GoAcademica Research & Publishing
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DOI: 10.54783/ijsoc.v3i1.295
Wounds are damage to tissue structures and normal anatomical functions as a result of pathological processes originating from internal and external that hit certain organs. Wounds can be classified based on anatomical structure, properties, the healing process, and length of healing. The literature review aims to find out the modern application of the wound care-related wound healing process. Literature review through several stages, namely making questions, identification, eligibility, selection of article inclusion, and screening. The Selection Process is listed in the framework of the review literature and obtained the results of article 7 articles. The data showed different results adjusted to the system and the conditions of where the research was conducted. The results of the reviewed article focus on explaining the patient's comfort level and more significant healing process. Modern wound care application has been proven to provide comfort to patients in carrying out the wound healing process, and is very helpful for nurses in providing nursing services. The application of modern wound care is a wound care technique that will develop at any time based on the development of nursing science, in which case it focuses on the level of comfort of patients in receiving health services related to wound care. So nurses urgently need to improve and develop science related to the application of modern wound care that will support patient comfort in wound care and accelerate the wound healing process well.
PENENTUAN TAHANAN JENIS BATUAN ANDESIT MENGGUNAKAN METODE GEOLISTRIK KONFIGURASI SCHLUMBERGER (STUDI KASUS DESA POLOSIRI)
- Munaji;
Syaiful Imam;
Ismi Lutfinur
Jurnal Fisika Vol 3, No 2 (2013)
Publisher : Universitas Negeri Semarang
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DOI: 10.15294/jf.v3i2.3820
Telah dilakukan penelitian untuk menentukan nilai resistivitas dan kedalaman batuan andesit di Desa Polosiri. Prinsip kerja metode geolistrik adalah mempelajari aliran listrik di dalam bumi dan cara mendeteksi di permukaan bumi. Metode tahanan jenis didasari oleh hukum Ohm, untuk mengetahui jenis lapisan batuan didasarkan pada distribusi nilai resistivitas pada tiap lapisan. Variasi harga tahanan jenis akan didapatkan jika jarak masing-masing elektroda diubah, sesuai konfigurasi alat yang dipakai (konfigurasi Schlumberger). Data hasil pengukuran di lapangan berupa beda potensial dan arus yang dapat digunakan untuk menghitung resistivitas semu. Penelitian ini dilakukan sebanyak tiga lintasan. Data hasil pengukuran diolah menggunakan software IPI2Win. Berdasarkan hasil penelitian diperoleh bahwa batuan andesit di Desa Polisiri memiliki resistivitas 212 Ωm – 300 Ωm dengan kedalaman 1.3 m - 1.86 m.