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Sliding failure analysis of a gabion retaining wall at km 31+800 of Lubuk Selasih-Padang city border highway, Indonesia 4

Sliding failure analysis of a gabion retaining wall at km 31...

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4th International Conference on Earthquake engineering and Disaster Mitigation, ICEEDM 2019

作者： Hanafi Putra, Hendri Gusti Andriani Magister Program Civil Engineering Department Faculty of Engineering Andalas University Padang Indonesia Civil Engineering Department Faculty of Engineering Andalas University Padang Indonesia

In August 2010, there was a landslide on the down-slope of national road section at Km 31+800 Lubuk Selasih-Padang City Border. In order to prevent further damage, it was necessary to make an immediate repair by constructing a gabion retaining wall. Since this repair was so urgent, physical and mechanical soil parameters for the stability analysis were determined from literature data. The stability analysis considered dangers of overturning, sliding, and soil bearing capacity. For the sliding stability analysis, the value for friction considered only the interaction between the soil and the base of the retaining wall, with the assumption that the contact area was equal to the total area of the entire base of the retaining wall. After the construction was completed, sliding failure occured due to pressure from the backfill embankment. This research performs a reanalysis of the retaining wall stability using soil and gabion parameters determined from field investigation and laboratory testing. In this reanalysis the friction contact area was assumed to be between the soil and the wire mesh of retaining wall. With these parameters and assumption, the main cause of sliding failure became clear, indicating that this approach increased the accuracy of stability analysis for gabion retaining walls. © 2020 The Authors, published by EDP Sciences.

关键词： Friction

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Chemical compounds in essential oil of nutmeg leaves (Myristica fragrans) from Batang Indonesia 10

Chemical compounds in essential oil of nutmeg leaves (Myrist...

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10th International Seminar on New Paradigm and Innovation of Natural Sciences and itsApplication, ISNPINSA 2020

作者： Kusumaningrum, H.P. Zainuri, M. Endrawati, H. Loka, B.D. Widiasa, I.N. Sulistyowati, E. Laboratory of Biotechnology Study Program of Biotechnology Faculty of Science and Mathematics Universitas Diponegoro Semarang Indonesia Laboratory of Oceanography Department of Oceanography Food Technology Department Faculty of Animal and Agricultural Sciences Diponegoro University Indonesia Chemical Engineering Department Faculty of Engineering Universitas Diponegoro Semarang Indonesia Architecture Department Faculty of Engineering Universitas Diponegoro Semarang Indonesia

Nutmeg oil has an important function as natural tropical biomedicine activity which commonly found in Batang region. This essential oil is one of the dominant traditional export product from Batang instead of patchouli oil, Clove oil, and lemongrass oil. The objective of the research was to analyze chemical compound of essential oil of nutmeg leaves from Batang region produced by traditional destillation. Research methods was conducted by GCMS method. The biomedical activity against some tropical diseases was analysed in-silico. The results showed that essential oil from nutmeg leaves showed potential antimicroabial activities in silico againts several tropical diseases in skin. The GCMS result showed 2-.BETA.-PINENE and .gamma.-Terpinene as the major compound with values 34,46% and 30,28%. © Published under licence by IOP Publishing Ltd.

关键词： Essential oils

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Coastal disaster mitigation through shoreline changes analysis in Pariaman city 4

Coastal disaster mitigation through shoreline changes analys...

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4th International Conference on Earthquake engineering and Disaster Mitigation, ICEEDM 2019

作者： Donal, Azria Paldi Andriani Magister Program Civil Engineering Department Faculty of Engineering Andalas University Padang Indonesia Civil Engineering Department Faculty of Engineering Andalas University Padang Indonesia

Disasters caused losses and damage to the coastal areas of Pariaman City. The construction costs for development in coastal areas are relatively expensive. Early good research must be done to monitor shoreline changes and reduce losses and damage in the coastal areas of Pariaman City. The method used to monitor shoreline changes using satellite images with GIS techniques. The coastal change analyzes is studied including coastal erosion and sedimentation. In this study, disaster mitigation and impacts reduction caused by coastal changes are the final purposes. The losses and damage due to coastal changes were monitored during a certain time. The results of this study are aimed to make a solution for disaster mitigation in coastal areas caused by the shoreline changes in Pariaman City. © 2020 The Authors, published by EDP Sciences.

关键词： Disasters

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The effect of lard concentration and ozonation on changes in polarization angle of olive oil 10

The effect of lard concentration and ozonation on changes in...

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10th International Seminar on New Paradigm and Innovation of Natural Sciences and itsApplication, ISNPINSA 2020

作者： Saputra, F.A. Azam, M. Arianto, F. Sofjan, K.F. Sugito, H. Alkian, I. Department of Physics Faculty of Science and Mathematics Diponegoro University Semarang50275 Indonesia Study Program of Automation Engineering Technology Vocational School Diponegoro University Indonesia

This research aims to analyze the effect of ozone exposure time and lard mixture on the polarization angle of transmission of olive oil. The study uses a transmission polarization method with a laser (λ = 532 nm) as a light source. The research sample in the form of olive oil mixed with lard at a concentration of 10, 20, 40, and 80%, with an ozone exposure time of 0-30 minutes. The sample is subjected to external electric fields with variations from 0-4.5 x 102 kV/m to increase the change's polarization angle. The results showed that the change in polarization angle would change linearly with the increase in lard concentration with olive oil. Olive oil with a low concentration of lard (10%) experienced an increase in the change in polarization angle with a value of 0.31 due to the effect of 90 minutes of ozone exposure. In general, the results of the study showed that increased concentrations of lard, ozone exposure time, electric field strengths caused an increase in changes in the polarization angle in a mixture of olive oil and lard. © Published under licence by IOP Publishing Ltd.

关键词： Mixtures

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Occurence of Microplastics in Water, Sediment and Milkfish (Chanos chanos) in Citarum River Downstream (Case study: Muara Gembong) 6

Occurence of Microplastics in Water, Sediment and Milkfish (...

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6th Environmental Technology and Management Conference, ETMC 2019

作者： Agustian Fareza, Achmad Sembiring, Emenda Environmental Engineering Study Program Faculty of Civil and Environmental Engineering Institut Teknologi Bandung Jl. Ganesha No. 10 Bandung40135 Indonesia

Microplastics in aquatic environment can possibly enter into the aquatic organism, so this study aims to identify the microplastic concentrations in water, sediment, and milkfish. The samples are taken in downstream Citarum river at Muara Gembong. Water samples were taken using a manta trawl pulled by a boat while sediment and milkfish samples were taken using the grab sampling method. Organic removal and cleaning was conducted by using the Fenton Oxidation method which use Fe and H2O2. The average of microplastic concentrations in river water, seawater ponds, mixed water, and seawater consecutively are 0.0574 ± 0.025 particles/m3, 3.000 ± 2.645 particles/L, 0.666 ± 0.577 particles/L and 1.333 ± 1.155 particles/L. The average of microplastic concentrations in sediment sea water pond, sediment mixed water pond and sea sediment samples consecutively are 3.666 ± 0.577 particles/20g, 2.667 ± 1.527 particles/20g, 2.333 ± 0.577 particles/20g and 0.667 ± 1.154 particle/20g. The average of microplastic concentrations in the gut and gills of milkfish in sea ponds and mixed ponds consecutively are 2.333 ± 2.266 particles/fish and 2.222 ± 3.768 particles/fish. The average of microplastic concentrations in milkfish tissues in the sea and mixed water ponds are 1.333 ± 1.000 particles/fish and 1.111 ± 1.167 particles/fish. © 2020 The Authors, published by EDP Sciences.

关键词： Lakes

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Analysis performance of forced convection cooling using synthetic jets with wave variations (sine, square, and triangular) 3

Analysis performance of forced convection cooling using synt...

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3rd International Conference on Science and Technology 2019, ICST 2019

作者： Putra, Bintang Arya Rhakasywi, Damora As'Adi, M. Cholis, Nur Mechanical Engineering Study Program Faculty of Engineering Universitas Pembangunan Nasional Veteran Jakarta Indonesia

Cooling effectiveness using a cooling fan on an electronic device becomes a benchmark. Speaker- based synthetic jets that are becoming innovations today work on the principle of zero input mass, producing air in the cavity with an oscillating membrane which results in the suction phase occurring in the orifice hole. The generated air then flows through the orifice to pound the heat source as a forced convection cooler. Speakers used as oscillating actuators resemble waveforms using sine, square, and triangular wave functions with frequencies of 80, 100, and 120 Hz. Air flow simulation created using Fluent CFD. The use of wave variations has different characteristics. Triangular waves indicate the final test temperature reaches 27oC, with an optimum frequency of 80 Hz. Air flow created in the form of vortex flow with a type of turbulent flow. The electric power consumption of cooling fans reaches ten times the consumption of synthetic jet power. © 2020 IOP Publishing Ltd. All rights reserved.

关键词： Orifices

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Application of online science practicum by using Microsoft Teams and Learning Management System (LMS) during the Covid 19 pandemic 10

Application of online science practicum by using Microsoft T...

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10th National Physics Seminar, SNF 2021

作者： Pertiwi, W.A. Sanjaya, L.A. Nadiyah Hasirah Haramen, M. Budi, A.S. Zarvianti, E. Puspa, R.W.D. Sianipar, L.K. Qoiriyah, W. Sitompul, H. Islamic Education Management Study Program Faculty Islamic of Education and Teacher Training Muhammad Azim Institute Jambi Indonesia Department of Physics Faculty of Mathematics and Natural Science Universitas Negeri Jakarta Indonesia Sharia Economics Study Program Faculty of Sharia and Law Muhammad Azim Islamic Institute Jambi Indonesia Physics Education Study Program STKIP Muhammadiyah Sungai Penuh Indonesia Kartika VIII-1 Senior High School Jakarta Indonesia Department of Physics Education Universitas Pelita Harapan Tangerang15811 Indonesia Informatics Engineering Study Program Faculty of Engineering Sheikh Yusuf Islamic University Tangerang Indonesia

The research objective of this is to see how to apply science practicum online using Microsoft Teams and Learning Management System (LMS). The form of this research is classroom action research which aims to apply the online science practicum during the Covid 19 pandemic. Therefore, it is carried out using two cycles in the application of online science practicum. The subjects of this study were students of the seventh semester in the Natural Science practicum course. Through observation and evaluation, it is shown that in the cycle I the percentage of practicum implementation which includes aspects of preparation, process and data and practicum results is 87.5%, in cycle II it has increased to 92.5%. In the assessment aspect of the practicum report, the average practicum assessment obtained in the first cycle was 3.09 from the highest score of 4 and in the second cycle was 3.7, while the aspect of student knowledge about the use of the Microsoft team which was taken using google form was 93%. In the aspect of student knowledge about the use of Learning Management System (LMS) by 75% and aspects of student understanding in the implementation of online science practicum using Microsoft Teams by 75%. © 2021 Institute of Physics Publishing. All rights reserved.

关键词： Students

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Decision Support System for Employee Performance Assessment for Administration Promotion Using Analytic Hierarchy Process 7

Decision Support System for Employee Performance Assessment ...

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7th IEEE International Conference on Smart Instrumentation, Measurement and Applications, ICSIMA 2021

作者： Kurniawan, Helmi Tanjung, Muhammad Rusdi Swondo, Ashari P Sari, Eka Purnama Negoro, Wahyu Saptha Yusfrizal Universitas Potensi Utama Faculty of Engineering and Computer Science Medan Indonesia Universitas Potensi Utama Visual Communication Design Study Program Medan Indonesia Universitas Potensi Utama English Education Study Program Medan Indonesia Universitas Potensi Utama Faculty of Economy and Business Medan Indonesia

ISBN: (纸本)9781728175225

Companies that are ready to compete must have effective management. To improve employee performance in effective management, it is necessary to support competent and competent employees in their fields. Employees who have an attitude of struggle, dedication, discipline, and professional ability are very likely to have work performance in carrying out their duties so that they are more efficient and effective. To increase employee morale, the Company will reward the best employees and be loyal to the company. This is done as an appreciation for what the employee has done for the company in achieving the company's targets. Decision making to determine the best employees can be done by the company by assessing the performance that has been done by its employees within a certain period of time. Employee performance appraisal is influenced by several criteria, namely attitude, attendance, performance and Service Period. The decision support system for selecting the best employees uses the Analytical Hierarchy Process (AHP) method, where the decision-making process is carried out by assessing alternative choices based on predetermined criteria and can also help the Company to make the best employee decisions. The alternative matrix calculation yields a score of 25.1% for Safrizal, 25.8% for Dedek Rizky, 25.1% for Amira Syakira and 24.0% for Reni Kumala, and the employee who is recommended as the best employee is the employee with the highest score, namely Dedek Rizky with a score of 25.8%. © 2021 IEEE.

关键词： Decision support systems

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The study of Coastline Changing and Total Suspended Solid Distribution Based on the Remote Sensing Data in Teluk Lamong Multipurpose Port Terminal 8

The Study of Coastline Changing and Total Suspended Solid Di...

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8th International Seminar on Ocean and Coastal engineering, Environmental and Natural Disaster Management, ISOCEEN 2020

作者： Pratikto, Widi Agoes Fitriadhy, Ahmad Maulana, Muhammad Ilham Huda, Abiyani Choirul Putri, Destyariani Liana Simatupang, Liany Ayu Wahyudi, Nazariano Rahman Laksono, Rendatiyarso Dewi, Anggie Vibriyanti Rossari Ocean Engineering Departement Faculty of Marine Technology Institut Teknologi Sepuluh Nopember Surabaya60111 Indonesia Department of Maritime Technology Faculty of Ocean Engineering Technology and Informatics Universiti Malaysia Terengganu Malaysia Ocean Engineering Study Program Institut Teknologi Kalimantan Kalimantan Timur76127 Indonesia

Looking forward to the abovementioned conditions, this research is needed to elaborate on the effects of the reclamation to the marine resources in Teluk Lamong Multipurpose Port Terminal as the reclaimed product. In order to describe the impact of the port development, this study will analyze the shoreline changing, the current pattern modeling, as well as the Total Suspended Solid (TSS) modeling using the remote sensing data. The several numbers of expected objectives through this study are to get the set of scientific information on the shoreline changing in Teluk Lamong Multipurpose Port Terminal in the year of 2012 and 2020, to get the figure of current pattern in Teluk Lamong Multipurpose Port Terminal in the year of 2012 and 2020, and to elaborate TSS concentration through the modeling approach in Teluk Lamong Multipurpose Port Terminal in the year of 2012 and 2020. Hence, there is a set of methodologies and tools to cooperate with the information before and after the reclamation. The use of the Digital Shoreline Analysis System (DSAS) software to analyze coastline conditions. The using of Mike 21 to analyze the current pattern and TSS concentrations. In addition to the TSS analysis, it will also need a set of remote sensing data from the Google Earth Engine (GEE). The modeling and calculation give information about the End Point Rate (EPR) values and TSS values. The EPR values are 107.5 m/year, 59,625 m/year and 10,375 m / year. The TSS values are 0-20 mg/L, 20.1-40 mg/L, 40.1-80 mg/L, 80.1-120 mg/L and >120.1 mg/L. Moreover, the result shows the different values among the length of coastline, the current pattern, and TTS in the years 2012 and 2020. The difference in the coastline reaches 950 m at this latest 8 years. While it also brings the changing to the current pattern and sediment transport which show through its current velocity and sediment content per liter of seawater during high and low tide accordingly. © Published under licence by IOP Publishing

关键词： Sediment transport

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YoBagi's User Experience Evaluation using User Experience Questionnaire

YoBagi's User Experience Evaluation using User Experience Qu...

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International Conference on Informatics and Computing (ICIC)

作者： Fransiskus Panca Juniawan Dwi Yuny Sylfania Rendy Rian Chrisna Putra Henderi Program Study of Technology Information University of Bangka Belitung Pangkalpinang Indonesia Program Study of Informatics Engineering Institut Sains dan Bisnis Atma Luhur Pangkalpinang Indonesia Informatics Engineering Faculty of Science and Technology University of Raharja Tangerang Indonesia

ISBN: (纸本)9798350345728

The pandemic has brought many negative impacts on human life. One of the negative impacts is economic downturn of Micro, Small, and Medium Enterprise (MSME) actors in Bangka Belitung Province. To solve this problem, a website-based marketplace platform called Yobagi was created. As we know, a new software product must have a good user experience. By having a good user experience means that the product has met the needs of its users. For this reason, an evaluation of the user experience is necessary. This study aims to measure the user experience of using Yobagi. The evaluation uses the User Experience Questionnaire (UEQ) tool, which consists of six scales: Attractiveness, Efficiency, Perspicuity, Dependability, Stimulation, and Novelty. There were 40 respondents who were taken from the top of MSME actors. As the UX evaluation results, it is known that the final score of the six scales is above 0.8 and at the excellent level. This means that Yobagi users have a very good user experience in using Yobagi. In addition, Yobagi has met the criteria for good software by having an excellent user experience value.

关键词： Economics System testing Pandemics Entrepreneurship User experience Software Informatics

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