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The J-value as the measurement tool of the bonds investor's behavior

AIP Conference Proceedings 2021年第1期2331卷

作者： Josep Ginting Lydia Anggraini 1Study Program of Accounting Faculty of Business President University Jl. Ki Hajar Dewantara Jababeka Education Park Cikarang Baru Bekasi 17550 Indonesia 2Study Program of Mechanical Engineering Faculty of Engineering President University Jl. Ki Hajar Dewantara Jababeka Education Park Cikarang Baru Bekasi 17550 Indonesia

For many years, mathematics has been used to solve the problem in economic and finance instead of natural science and engineering. This paper shows how accurate mathematics reads financial behavior. One of the financial areas using the mathematics approach is the bond valuation technique. Bond is one of the long term debt instruments. The finding in this research is that mathematics can be used to read the changes in the concept of a pricing model where the par value of bonds is always going to 100% at the maturity date. Theoretically, the bonds fair price is resulted by calculating the present value of future coupon interest of bonds, but not in practice, caused by the bonds investor behavior. The difference in price, resulted from both different approaches, in this paper is defined by a new mathematical concept to reflect the bonds' investor behavior. It is the aim of this research. To address the differences, we have evaluated the fair price of bonds calculation by creating new mathematics equations by combining the calculation of the present value of future coupon interest of bonds with the market concept models. The result is a new mathematical model called J-Value. To prove the eligibility of J-Value, a simulation was done. The mathematics model in this paper is found by combining the usage of a qualitative method and supported by a quantitative method.

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Application of air conditioner (AC) automation system on arduino flatform-based vehicle

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IOP Conference Series: Materials Science and engineering 2020年第1期885卷

作者： Randis S H Wijaya Heavy Equipment Study Program Mechanical Engineering Department Balikpapan State Polytechnic Balikpapan Indonesia

This study aims to design and create a safety device and automation system in the use of air conditioner (ac) use in-vehicle units, especially in four-wheeled vehicles based on Arduino UNO microcontroller Atmega 328. The safety device system created in this study used Arduino UNO as its microcontroller, a tool was equipped with a PIR sensor that was positioned in the cabin and a limit switch placed at the door of the vehicle. If there are humans inside the vehicle unit, the PI sensor will detect movement, and if the unit door is in the closed position, the limit switch will be depressed. The principle used the AND logic gate principle where both inputs both the PIR sensor and the limit switch must work together to turn on the AC, but if only one input works, then the AC will not turn on. The results of this study indicated the tool could work under the design that has been done, and the programming of the safety device can work well according to the desired working principles through the programming commands on the Arduino UNO microcontroller.

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Development of an Automatic Anti Pitching System (APS) Autonomous Surface Vehicle (ASV) for Fish Mapping

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Journal of Physics: Conference Series 2020年第3期1569卷

作者： Noverdo Saputra Muhammad Arifudin Lukmana Purwo Joko Suranto Study Program Naval Architecture Universitas Pembangunan Nasional Veteran Jakarta Indonesia Study Program Mechanical Engineering Universitas Pembangunan Nasional Veteran Jakarta Indonesia

The common problem occurs in fish mapping using autonomous surface vehicles (ASV) is pitching stability. Some researchers have indicated that problem affects the results of mapping. The target of this system is to design an Autonomous Pitching System (APS) for ASV using numerical simulation software. The simulation is done by implement APS into the system, producing an oscillatory motion from the ASV. For both dynamics of craft in short and long periods, APS with proportional controller (P), proportional-integral controller (PI), and proportional-integral-derivative controller (PID) are developed in order to minimize the oscillatory behaviour. It was found that for the short period dynamics, the APS with PI controller was the optimal controller, followed by the PID controller and then the P controller. For the long period dynamics, the APS with PID controller was optimal.

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Solar air heater for preheating the air of broiler house 6

Solar air heater for preheating the air of broiler house

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6th International Conference on Sustainable Energy engineering and Application, ICSEEA 2018

作者： Hanifah, Umi Abdurrachim, A. Adriansyah, Willy Centre of Appropriate Technology Development Indonesian Institute of Sciences Subang Indonesia Study Program of Mechanical Engineering Faculty of Mechanical and Aerospace Engineering Bandung Institute of Technology Bandung Indonesia

ISBN: (纸本)9781538666838

Theoretical studies have been conducted on the application of solar air heater for preheating the air of broiler house. The air heating system of broiler house was use a gas air heater and equipped with rocks bed as the thermal storage medium. The study was conducted for the broiler house with the capacity of 30,000 chickens, which is a house with a size of 100 m x 12 m and has two floors, each floor with a capacity of 15,000 chickens. This study aims to determine the potential amount of savings the use of LPG and operating costs of heating chicken coops during the brooding period (2 weeks of starting the chicken farm) on a chicken coop that using the additional solar air heater and heat storage medium compared to air gas heater only. The study shows that the proposed heating system can save gas usage as much as 613.06 kg per harvest cycle. However, the proposed heating system requires additional electrical energy to operate the fan/blower, amounting to 700.66 kWh per crop cycle. The operational cost savings of the proposed heating system is IDR 6,066,358,-per crop cycle (the calculation basis as of November 2015). © 2018 IEEE.

关键词： Solar energy

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The effect of varying quenching media on cooling time and microstructures of leaf spring steel AISI 5160

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AIP Conference Proceedings 2021年第1期2363卷

作者： Anton Sudiyanto Eko Pujiyulianto 1Metallurgical Engineering Department of Mining Engineering Faculty of Mineral Technology Universitas Pembangunan Nasional “Veteran” Yogyakarta 55283 Indonesia 2Mechanical Engineering Study Program Institut Teknologi Sumatera (ITERA) South Lampung Lampung 35365 Indonesia

The mechanical properties of the material is affected by the microstructure, and the microstructure is determined by the cooling time. This research aims to evaluate the effect of varying quenching media on cooling time and microstructures of leaf spring steel AISI 5160. The leaf spring steel AISI 5160 was heat-treated at 850 oC for 30 minutes and was cooled in the varying quenching media. The quenching media were oil, water, water 1 L + soap 10 g, water 1 L + soap 15 g, water 1 L + soap 25 g, water 1 L + urea 10 g, water 1 L + urea 15 g, water 1 L + urea 25 g sand, air, and furnace. The cooling times were calculated by newton's law of cooling and heating equation, the microstructures were observed by an optical light microscope, and the percentages of martensite and retained austenite in the material were calculated by Optimas software. The results show that the fastest cooling time is 20.20 s cooled in water 1 L + urea 25 gr, and the longest cooling time is 82800 s cooled in the furnace. The microstructures of the material were martensite and retained austenite when the materials are cooled in a water and oil base quenching media. The microstructures were ferrite and pearlite when the materials are cooled in air, sand, and the furnace. The lowest percentage of the martensite is 78.4 % cooled in oil quenching media, and the highest percentage of the martensite is 94.4 % cooled in water + urea 25 g.

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Experimental investigation of thermal behavior in an active type solar water heater based on phase change material using solar simulator

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AIP Conference Proceedings 2020年第1期2296卷

作者： Muhammad Nadjib Suhanan Joko Waluyo 1Doctoral Study Program Department of Mechanical and Industrial Engineering Faculty of Engineering Gadjah Mada University Yogyakarta Indonesia 2Mechanical Engineering Study Program Faculty of Engineering Universitas Muhammadiyah Yogyakarta Yogyakarta 55183 Indonesia 3Department of Mechanical and Industrial Engineering Faculty of Engineering Gadjah Mada University Yogyakarta Indonesia

The weakness of an outdoor solar water heater (SWH) experiments is the difficulty in determining its thermal behavior. The fluctuation of solar radiation intensity causes the supply of energy received by SWH also fluctuate. The result is that the thermal behavior of the SWH cannot be known for specific parameters. This paper aims to investigate the thermal behavior of an active type SWH containing paraffin wax using the constant heat flux method. A phase change material (PCM) inserted into the capsule. The capsules were arranged in a tank to form a heat exchanger (HE). The thermocouples were mounted both on the waterside and the PCM side. The solar simulator installed on the top of the collector, and the SHW system placed indoors. The heat flux and water flow were set at 1000 W/m2 and 2 LPM, respectively. The temperatures of water and PCM for 143 minutes charging recorded. The data obtained were used to analyze the thermal behavior of water and PCM. The results showed that the average heating rate of water and PCM was 0.227 °C/min and 0.205 °C/min, respectively. The value of this adjacent average heating rate shows that HE has functioned well in removing heat energy from water. The accumulated thermal energy produced was 13.08 MJ. Indoor experiments can reveal the thermal behavior of the SWH-PCM systems.

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Qualitative comparative analysis (QCA): Multi-variables and small samples research approach (case study: Indonesia’s Megaprojects)

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AIP Conference Proceedings 2020年第1期2217卷

作者： Retno Wulan Damayanti Budi Hartono Andi Rahadiyan Wijaya 1Doctoral Study Program of Industrial Engineering Department of Mechanical and Industrial Engineering Gadjah Mada University Yogyakarta Indonesia 2Industrial Engineering Study Program Sebelas Maret University Surakarta Indonesia

This paper aims to provide an overview of what a Qualitative Comparative Analysis (QCA) method is, its differences with the classical methods, the principles, and the QCA types. Literature studies and Indonesia megaproject case study is used to explain the concept of the QCA method. A comprehensive discussion of this paper produces a concise description of the QCA method that has the potential to be used to study multivariable research with small sample size. This study also succeeded in formulating a framework that can be used as a guide for researchers in determining when to use the QCA method.

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Developing Learning Media of Electronic Fuel Injections (EFI) System Android-Based in Piri 1 Yogyakarta Vocational High School

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Journal of Physics: Conference Series 2020年第1期1700卷

作者： M R Ikhsan M Solikin J N Rohman Automotive Engineering Education Study Program Universitas Negeri Yogyakarta Indonesia Graduate Program Student Mechanical Engineering Politechnika Wrocławska Wrocław Poland

This research aims to: (1) producing android-based Electronic Fuel Injections (EFI) learning media; (2) knowing the feasibility of android-based EFI learning media; and (3) knowing students' responses to the learning media of the Android-based Electronic Fuel Injections (EFI) system. The rsearch was conducted using the Borg and Gall model modified by Sugiyono. The technique of data collection is done by questionnaire, while the data analysis technique uses descriptive quantitative methods. The results of the research were obtained: (1) products in the form of Android-based Electronic Fuel Injections (EFI) system learning media; (2) learning media in terms of material included in the very feasible category and in terms of media included in the very feasible category; and (3) students' responses when testing the product, the aspects of use are included in the category very easily and the aspects of usefulness are included in the category of very useful. The response of students when testing the use, the aspects of use included in the category is very easy and the usefulness aspects including the category is very useful.

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Automating CAD for creating assembly structure from Bill of Materials

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IOP Conference Series: Materials Science and engineering 2021年第1期1034卷

作者： Nanang Ali Sutisna Nasir Widha Setyanto Mechanical Engineering Department Faculty of Engineering President University Jababeka Education Park Jl. Ki HajarDewantara Cikarang Bekasi 17550 Indonesia Professional Engineer Study Program Faculty of Engineering Brawijaya University Jl. MT Haryono 167 Malang 65145 Indonesia

This paper presents the development of an add-on for CAD system generating assembly structure automatically based on a given Bill of Materials (BOM). The BOM in Excel format is scanned by the system and the system arrange 3D CAD files into assembly at in CATIA V5 CAD system automatically. This program has been tested and succeeded well at compiling 3D assembly based on 3D part file data that is available or not available. If the 3D file is not available then the 3D assembly is still generated according to the assembly structure listed on Excel file but its 3D representation does not appear.

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Development Method for Nickel Electroplating on Aluminium

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IOP Conference Series: Materials Science and engineering 2020年第1期1007卷

作者： Tjokorda Gde Tirta Nindhia Dewa ngakan Ketut Putra Negara I Wayan Agus Saputra Pradeep Kr. Sharma Study Program of Mechanical Engineering engineering Faculty Udayana university Jimbaran Bali Indonesia DKN Modi University Rajasthan India

Aluminum is important material due to high strength/weight ratio. Nickel plating is proposed on luminium for the purpose of improving wear resistance, tribological properties, surface hardness, and decorative appearance. There are number of difficulties when electroplating nickel on luminium is expected. The luminium is amphoteric are soluble in both alkaline and acid. The potential difference between luminium and nickel can affect the deposition reaction due to the diameter and the crystal lattice structure of both different atoms. This study developed nickel electroplating on luminium. Copper and zinc are used as intermediate deposits and final pretreatment coating performed with nickel plating. Interface layers that have been produced are investigated to determine the quality of the nickel layer is obtained.

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