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Potassium recovery from banana peels by hydrothermal treatment

AIP Conference Proceedings 2018年第1期2026卷

作者： Mustaqim Mustaqim Chandra Wahyu Purnomo Rochim Bakti Cahyono 1Master Program of Systems Engineering Universitas Gadja Mada Yogyakarta Indonesia 2Chemical Engineering Department Universitas Gadja Mada Yogyakarta Indonesia 3Agrotechnology Innovation Center PIAT-UGM Sleman Yogyakarta Indonesia

Banana peels is a material that can be used as a potassium source for organic fertilizer. Potassium fertilizer has a role in improving plants productivity. This research aims to determine the effect of hydrothermal temperature on the potassium concentration in hydrothermal liquid product and to find out the potential of zeolite in adsorbing potassium from the solution. Thus, there were two stage of experiment of potassium recovery here i.e. potassium extraction process from banana peel waste by a hydrothermal treatment in various temperature (150, 175 and 200°C) for 1 hour and the adsorption process of potassium in the liquid product by adding zeolite for 24 hours. The result shows that higher treatment temperature of will produce higher concentration of potassium in the solution while the highest potassium uptake is using 40 g of natural zeolite in 50 ml hydrothermal liquid product with the recovery is about 94%.

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Loan to value (LTV) ratio policy and its impact to property development

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AIP Conference Proceedings 2020年第1期2230卷

作者： Dyar Paramitha Ahmad Gamal Azrar Hadi 1Master Student Program Architecture Department Faculty of Engineering University of Indonesia Indonesia 2Assistant Professor Architecture Department Faculty of Engineering University of Indonesia Indonesia 3Lecturer Architecture Department Faculty of Engineering University of Indonesia Indonesia

One of the changes in Bank Indonesia (BI) policy Number 20/8/PBI/2018 (PBI, 2018) regulates the Loan to Value (LTV) ratio for a residential property loan. This research examines changes in housing developer behavior in providing the housing products before and after the loan to value ratio (LTV) easing policy. The changes in the Bank Indonesia policy to release the loan to value ratio for the purchase of the first house with an area of more than seventy square meters is one of the government's solution to encourage the growth of housing property. This issue is due to the difficulty of the first-time home buyer in paying the down payment. The design of this research uses a case study of multiple case holistic designs and uses a qualitative analysis method. Qualitative data were obtained from in-depth interviews with nine housing developers. We found that most developers are willing to change their market segmentation to a lower segment (36 household type) than the previous ones that they have set. We concluded that the LTV ratio easing policy cannot help many developers if the macroeconomic conditions are still weak.

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Seismicity study of volcano-tectonic in and around Tangkuban Parahu active volcano in West Java region, Indonesia

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AIP Conference Proceedings 2016年第1期1730卷

作者： Rexha V. Ry A. Priyono A. D. Nugraha A. Basuki 1Master Program of Geophysical Engineering Faculty of Mining and Petroleum Engineering Institut Teknologi Bandung Indonesia 2Global Geophysics Research Group Faculty of Mining and Petroleum Engineering Institute of Technology Bandung Indonesia 3Center for Volcanology and Geological Hazard Mitigation Bandung Indonesia

Tangkuban Parahu is one of the active volcano in Indonesia located about 15 km northern part of Bandung city. The objective of this study is to investigate the seismic activity in the time periods of January 2013 to December 2013. First, we identified seismic events induced by volcano-tectonic activities. These micro-earthquake events were identified as having difference of P-wave and S-wave arrival times less than three seconds. Then, we constrained its location of hypocenter to locate the source of the activities. Hypocenter determination was performed using adaptive simulated annealing method. Using these results, seismic tomographic inversions were conducted to image the three-dimensional velocity structure of Vp, Vs, and the Vp/Vs ratio. In this study, 278 micro-earthquake events have been identified and located. Distribution of hypocenters around Tangkuban Parahu volcano forms an alignment structure and may be related to the stress induced by magma below, also movement of shallow magma below Domas Crater. Our preliminary tomographic inversion results indicate the presences of low Vp, high Vs, and low Vp/Vs ratio that associate to accumulated young volcanic eruption products and hot material zones.

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Analysis of working posture on musculoskeletal disorders of vocational garment student’s in garment assembly operations practice

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AIP Conference Proceedings 2020年第1期2217卷

作者： Irham Aribowo Bambang Suhardi Eko Pujiyanto 1Master Program of Industrial Engineering Universitas Sebelas Maret Surakarta Jl. Ir. Sutami No. 36 A Kentingan Surakarta 57126 Indonesia 2Garment Engineering AK Tekstil Solo JL. Ki Hajar Dewantara Surakarta 57126 Indonesia

Garment assembly operation practice is one of the courses in the garment study program. It is a process of learning to sew components into apparel use a single needle sewing machine. The existing sewing machine has fix height at the table and the chair which is not base from the ergonomic aspects on working posture. Incompatibility of working posture will lead the student to obtain a variety of muscle and bone disorders. In this study, 11 students are measured of work postures by RULA scores, while the fatigue level was measured use Nordic Body Map Questionnaire. The results showed that students have complained of pain in back, buttocks, waist and nape of the neck. The RULA scores showed that there awkward work posture. It is indicated that the working posture in the garment assembly operation practice needs to change.

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A framework of stand up motorized wheelchair as universal design product to help mobility of the motoric disabled people

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AIP Conference Proceedings 2020年第1期2217卷

作者： B. Bambang Sulistiyawan Susy Susmartini Lobes Herdiman 1Master program of Industrial Engineering Faculty of Engineering Universitas Sebelas Maret Surakarta Jl. Sutami No. 36A Kentingan Surakarta 57126 Indonesia 2Departement of Industrial Engineering Faculty of Engineering Universitas Sebelas Maret Surakarta Jl. Sutami No. 36A Kentingan Surakarta 57126 Indonesia

The number of motoric disabled people in mobility is high. Motoric disability inhibits necessity to maximize one’s potential and working on it has numerous great benefits such as transporting to other places, doing the job, exercises or health recovery. They need appropriate assistive devices as power wheelchair models to assist their daily activity. However, they have many barriers to access them such as the price and availability of the device, and possible solutions in technology is needed especially in developing country like Indonesia. One possible solution is to reduce the owning cost of the assistive device, it is by proposing research by making the prototype of the stand up motorized wheelchair (SUMW) which uses the approach by Universal Design concept to accommodate the motoric disability needs and proposed as an assistive mobility device which has reasonable price, comfort in mobility, enable the users to be healthier and productive even in their disability status. As the first prototype product, the SUMW was designed by composing the existing electric motor driver of electric wheelchair and three standard actuators of patient bed with the special purpose of mechanical frame structure by using reverse engineering approach. This paper aims to descript the connection of theories to research problems, purposes, design and significance, so that it can give some visions about further researches to develop a stand up motorized wheelchair.

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Improve earthquake hypocenter using adaptive simulated annealing inversion in regional tectonic, volcano tectonic, and geothermal observation

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AIP Conference Proceedings 2015年第1期1658卷

作者： Rexha Verdhora Ry Andri Dian Nugraha 1Master Program of Geophysical Engineering Faculty of Mining and Petroleum Engineering Institut Teknologi Bandung Jalan Ganesha No.10 Bandung 40132 Indonesia 2Global Geophysical Research Group Faculty of Mining and Petroleum Engineering Institut Teknologi Bandung Jalan Ganesha No.10 Bandung 40132 Indonesia

Observation of earthquakes is routinely used widely in tectonic activity observation, and also in local scale such as volcano tectonic and geothermal activity observation. It is necessary for determining the location of precise hypocenter which the process involves finding a hypocenter location that has minimum error between the observed and the calculated travel times. When solving this nonlinear inverse problem, simulated annealing inversion method can be applied to such global optimization problems, which the convergence of its solution is independent of the initial model. In this study, we developed own program codeby applying adaptive simulated annealing inversion in Matlab environment. We applied this method to determine earthquake hypocenter using several data cases which are regional tectonic, volcano tectonic, and geothermal field. The travel times were calculated using ray tracing shooting method. We then compared its results with the results using Geiger’s method to analyze its reliability. Our results show hypocenter location has smaller RMS error compared to the Geiger’s result that can be statistically associated with better solution. The hypocenter of earthquakes also well correlated with geological structure in the study area. Werecommend using adaptive simulated annealing inversion to relocate hypocenter location in purpose to get precise and accurate earthquake location.

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Optimal location of rail-road freight hubs: A case study

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AIP Conference Proceedings 2019年第1期2097卷

作者： Virda Hersy Lutviana Saputri Yuniaristanto Wahyudi Sutopo Muh. Hisjam 1Master Program of Industrial Engineering Faculty of Engineering Universitas Sebelas Maret Surakarta Jl. Ir. Sutami No. 36 A Kentingan Surakarta 57126 Indonesia 2Department of Industrial Engineering Faculty of Engineering Universitas Sebelas Maret Surakarta Jl. Ir. Sutami No. 36 A Kentingan Surakarta 57126 Indonesia

Hub facility location in this study is related with driving the traffic from origin to destination of the cargo express by finding optimal hub facilities and allocating demand node to hubs. The objective of this research is to determine the locations of hubs to allocate non-hub nodes to hubs with minimizing total cost. Total cost includes transportation costs from origin to destination, fixed costs for new hub investments, and carbon emission costs resulting from transportation activities among facilities. An approach to the capacitated multiple allocation hub location problem is presented and an integer linear programming model is developed to find the solution of this problem. This study also calculated the carbon emission level to consider environmental effects as an integration method in sustainable supply chain management applied to facility location problem. Computational analysis is conducted in order to observe the resulting hub networks. The final results of this research are the optimal locations for cargo express transfer terminals attached in a hub-and-spoke network. The results obtained PWS stations selected as hub facilities with the total required cost of IDR 758,650,360.103. The delivery of goods by train is done through the station route PWS, KT, YA, KTA, KYA, PWT, CN, BKS, JNG, and PSE.

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Mapping of earthquakes vulnerability area in Papua

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AIP Conference Proceedings 2016年第1期1730卷

作者： Muhammad Fawzy Ismullah M. Muh. Altin Massinai 1Master Program Geophysical Engineering Faculty of Mining and Petroleum Engineering (FTTM) Bandung Institute of Technology (ITB) 10 th Ganesha Street Bandung 40116 West Java INDONESIA 2Geophysics Program Study Faculty of Mathematics and Natural Sciences Hasanuddin University (UNHAS) Perintis Kemerdekaan Km. 10 Street Makassar 90245 South Sulawesi INDONESIA

Geohazard is a geological occurrence which may lead to a huge loss for human. A mitigation of these natural disasters is one important thing to be done properly in order to reduce the risks. One of the natural disasters that frequently occurs in the Papua Province is the earthquake. This study applies the principle of Geospatial and its application for mapping the earthquake-prone area in the Papua region. It uses earthquake data, which is recorded for 36 years (1973-2009), fault location map, and ground acceleration map of the area. The earthquakes and fault map are rearranged into an earthquake density map, as well as an earthquake depth density map and fault density map. The overlaid data of these three maps onto ground acceleration map are then (compiled) to obtain an earthquake unit map. Some districts area, such as Sarmi, Nabire, and Dogiyai, are identified by a high vulnerability index. In the other hand, Waropen, Puncak, Merauke, Asmat, Mappi, and Bouven Digoel area shows lower index. Finally, the vulnerability index in other places is detected as moderate.

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Preliminary result of 3-D attenuation tomography beneath Sunda Strait and western part of Java

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AIP Conference Proceedings 2017年第1期1857卷

作者： Muhajir Anshori Andri Dian Nugraha Nanang T. Puspito 1Master Student of Earth Science Study Program Faculty of Earth Sciences and Technology InstitutTeknologi Bandung Indonesia 2Indonesian Meteorological Climatological and Geophysical Agency (MCGA) Indonesia 3Global Geophysics Research Group Faculty of Mining and Petroleum Engineering InstitutTeknologi Bandung Indonesia

Sunda strait lies in the transition zone of two different subduction system that is almost perpendicular to the subduction in southern Java and oblique subduction in western Sumatra. The series of major disasters such as earthquakes and volcanic eruptions is a manifestation of its tectonic setting complexity. We used selected waveform data from724 earthquakes that occurred around the Sunda strait and western part of Java from 2009 – 2015 recorded by 21 MCGA network stations to construct three dimensional image of seismic attenuation. Frequency independent attenuation operators (t*) was determined using spectral fitting method for P and S wave arrivals, respectively. The inversion was performed using simul2000 algorithm to image the lateral and vertical variations of Qp and Qs value in the Sunda Strait and western part of Java. Some interesting features such as subducting slab, mantle wedge, magma chamber under volcanos and fault zones can be imaged well.

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Tectonics earthquake distribution pattern analysis based focal mechanisms (Case study Sulawesi Island, 1993–2012)

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AIP Conference Proceedings 2015年第1期1658卷

作者： Muh. Fawzy Ismullah M. Lantu Sabrianto Aswad Muh. Altin Massinai 1Master Program Geophysical Engineering Faculty of Mining and Petroleum Engineering (FTTM) Bandung Institute of Technology (ITB) Jl. Ganesha no. 10 Bandung 40116 Jawa Barat INDONESIA 2Geophysics Program Study Faculty of Mathematics and Natural Sciences Hasanuddin University (UNHAS) Jl. PerintisKemerdekaan Km. 10 Makassar 90245 Sulawesi Selatan INDONESIA

Indonesia is the meeting zone between three world main plates: Eurasian Plate, Pacific Plate, and Indo – Australia Plate. Therefore, Indonesia has a high seismicity degree. Sulawesi is one of whose high seismicity level. The earthquake centre lies in fault zone so the earthquake data gives tectonic visualization in a certain place. This research purpose is to identify Sulawesi tectonic model by using earthquake data from 1993 to 2012. Data used in this research is the earthquake data which consist of: the origin time, the epicenter coordinate, the depth, the magnitude and the fault parameter (strike, dip and slip). The result of research shows that there are a lot of active structures as a reason of the earthquake in Sulawesi. The active structures are Walannae Fault, Lawanopo Fault, Matano Fault, Palu – Koro Fault, Batui Fault and Moluccas Sea Double Subduction. The focal mechanism also shows that Walannae Fault, Batui Fault and Moluccas Sea Double Subduction are kind of reverse fault. While Lawanopo Fault, Matano Fault and Palu – Koro Fault are kind of strike slip fault.

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