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Spatial distribution of soil water content in potato horizontal-ridge profile under various ridge dimensions

IOP Conference Series: Earth and Environmental Science 2019年第1期406卷

作者： Krissandi Wijaya Purwoko Hari Kuncoro Ardiansyah Poppy Arsil Hilda Ary ani Study Program of Agricultural Engineering Department of Agricultural Technology Faculty of Agriculture Jenderal Soedirman University Jl. dr. Soeparno Karangwangkal Purwokerto 53123

Vertical (slopping)-ridge is generally applied to cultivate potato crop in tropical highland area with intensive use of non-organic fertilizer, by which the soil erosion as well as environmental degradation might be significantly accelerated. On the other hand, horizontal (contour)-ridge has been very effective to reduce the soil erosion in potato cropping field, but yet slightly ineffective to support the optimal crop production, due to the waterlogging in the ridge profile. Dimension of the horizontal-ridge is expected to affect water distribution as well as the waterlogged condition, on which a specific study need to be focused, in order to develop an appropriate drainage system on the ridge. This study was aimed to characterize the spatial distribution of soil water in the horizontal-ridge profile under various ridge dimensions. Totally 9-potato-plots of 300 x 300 cm2 with 5% slope were prepared in Serang village, Purbalingga with various dimensions and replications of the horizontal ridges: 30 x 30 x 30 cm3 (G30), 30 x 40 x 30 cm3 (G40), and 30 x 50 x 30 cm3 (G50). Of each plot, the dielectrically (volumetric)-water content of the horizontal-ridge soil within the grid of 80 x 80 cm2 at the depth of 5, 10, and 20 cm were measured every months using EC5 moisture sensors and EM50 data logger, and then averaged. Based on the given grid, the data were plotted in contour pattern and were then analysed using semivariogram (Gstat and GNUplot) to characterize the spatial distribution and variability, respectively. The results showed that the spatial distribution of dielectrically (volumetric)-water contents tended to be inter-correlated within each ridge dimension, and the data were increased with soil depth and ridge dimension increment. Accordingly, the data were spatially-correlated with sill (C, semivariance) ranged from 0.00084-0.00429 cm3 cm−3 and range of influence (a) ranged from 0.624 - 2.809 m, in which the G50 had most representative and stable trend of the s

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A first-principles study on the quantum tunneling of methylhydroxycarbene isomerization in various solvents

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Journal of Physics: Conference Series 2020年第1期1568卷 012003-012003页

作者： E D Susanti F Rusydi I Puspitasari R N Fadilla N D Aisyah A Ahmad Research Center for Quantum Engineering Design Faculty of Science and Technology Universitas Airlangga Jl. Mulyorejo Surabaya 60115 Indonesia Department of Physics Faculty of Science and Technology Universitas Airlangga Jl. Mulyorejo Surabaya 60115 Indonesia Visiting Researcher at Precision Sciences & Technology and Applied Physics Graduate School of Engineering Osaka University Suita 565-0871 Japan Information System Study Program Faculty of Science and Technology Universitas Airlangga Jl. Mulyorejo Surabaya 60115 Indonesia School of Chemical Science and Food Technology Faculty of Science and Technology Universiti Kebangsaan Malaysia Bangi Selangor 43600 Malaysia

Quantum tunneling phenomenon allows a high-barrier reaction to occur even though thermal energy is not sufficient to surmount the barrier. The phenomenon has been suggested to exist in the isomerization of methylhydroxycarbene which occured at 11 K. Here we study the quantum tunneling that occured in the isomerization of methylhydroxycarbene to acetaldehyde and to vinyl alcohol based on density functional calculations. The isomerization pathways are determined under the effect of various solvents which are modeled by polarizable continuum model (PCM). We use Wentzel-Kramers-Brillouin (WKB) approximation to calculate the tunneling probability (T) and extend the usefulness of T into isomerization rate. The results show that the solvents give a significant effect on the isomerization rate of methylhydroxycarbene to acetaldehyde but an insignificant one on the isomerization rate to vinyl alcohol.

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Effects of compression ratio on physical and mechanical properties of bamboo oriented strand board

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IOP Conference Series: Materials Science and engineering 2020年第1期935卷

作者： S Maulana I Sumardi N J Wistara N H Kim F Febrianto Forestry Engineering Program Study Institut Teknologi Sumatera (ITERA) Lampung Selatan 35551 Indonesia School of Life Sciences and Technology Institut Teknologi Bandung Bandung 40132 Indonesia Department of Forest Products Faculty of Forestry and Environment IPB University (Bogor Agricultural University) Bogor 16680 Indonesia Department of Forest Biomaterials Engineering College of Forest and Environmental Science Kangwon National University Chuncheon 200-701 ReOSBlic of Korea

The objective of this study was to evaluate the physical and mechanical properties of a bamboo-oriented strand board (BOSB) under various compression ratios. The raw material of BOSB was betung (Dendrocalamus asper) strand that steamed and followed by rinsing with a 1% NaOH solution. BOSB with the dimensions of 30 × 30 × 0.9 cm3 were manufactured with a compression ratio of five levels i.e. 1.15; 1.25; 1.35; 1.44; and 1.54. Three layers of BOSB were made with a shelling ratio of 50:50. Phenol formaldehyde (PF) adhesive (SC=43%) was added with 8% concentration, while paraffin was used as much as 1% of the dry weight of the oven strand. Strand geometry evaluation was carried out on 100 strands randomly. The physical and mechanical properties were evaluated according to JIS A 5908-2003. The results showed that relatively homogeny strand geometry in this research was suitable to manufacture of BOSB. Increasing in BOSB compression ratio up to 1.54 increased mechanical properties. However, the increase of the BOSB compression ratio was decreased the dimensional stability. The optimum BOSB compression ratio was 1.35.

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Complete mitochondrial genome ofPenaeus acehensis(Crustacea, Decapoda, Penaeidae) from Aceh province, Indonesia

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Mitochondrial DNA Part B 2018年第2期3卷 898-899页

作者： Sinar Pagi Sektiana M. Tahang Sapto Andriyono Jobaidul Alam Hyun-Woo Kim Interdisciplinary Program of Biomedical Mechanical and Electrical Engineering Pukyong National University Busan Republic of KoreaAquaculture Technology Study Program Sekolah Tinggi Perikanan Jakarta Indonesia Brackishwater Aquaculture Development Center Aceh Indonesia Interdisciplinary Program of Biomedical Mechanical and Electrical Engineering Pukyong National University Busan Republic of KoreaFisheries and Marine Faculty Universitas Airlangga Surabaya Indonesia Interdisciplinary Program of Biomedical Mechanical and Electrical Engineering Pukyong National University Busan Republic of Korea Interdisciplinary Program of Biomedical Mechanical and Electrical Engineering Pukyong National University Busan Republic of KoreaDepartment of Marine Biology Pukyong National University Busan Republic of Korea

Penaeid shrimps are widely distributed from Indian to western Pacific Oceans and some which are economically important. In this study, we reported full mitochondrial genome of an endemic shrimp species,Penaeus acehensis, which inhabits exclusively in the coastal water of Aceh, Indonesia. Full length of circular mitogenome ofP. acehensiswas 15,991 bp in length, which contained 13 protein-coding genes, 2 rRNA genes, 22 tRNA genes, and a control region. Start codons of all protein-coding genes were ATN except for COX1 in which ACG was used. Incomplete stop codon (T- -) was found in five genes including COX2, COX3, NAD5, NAD4, and NAD4L. Among its relatives,P. acehensiswas most closely related toPenaeus monodonshowing 89% sequence identity in its mitogenome, which was corresponding to morphological analysis. Phylogenetic tree result showed thatP. acehensiswas clustered together with those were distributed in Indo-West Pacific region (clade II), which is distinct from Eastern Pacific region (clade I).

关键词： Mitogenome Dendrobranchiata next-generation sequencing shrimp Indonesia

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The implementation of teaching factory in producing fly ash based eco-friendly concrete products

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IOP Conference Series: Materials Science and engineering 2019年第1期535卷

作者： NA Inderawan S Widodo Pascasarjana Yogyakarta State University Caturtunggal Depok Sleman 55281 Yogyakarta Indonesia Study Program of Civil Engineering and Planning Education Faculty of Engineering Yogyakarta State University Caturtunggal Depok Sleman 55281 Yogyakarta Indonesia

This literature study aimed to describe eco-friendly solutions for developing teaching factory models in vocational high schools by using Fly Ash wastes as cemet replacement materials. The need for eco-friendly concrete has become an innovation which is able to reduce the impacts of environmental pollutions and the concrete product has better quality than conventional concrete. Vocational High Schools in Indonesia have good potential to apply this idea by using teaching factory model for producing eco-friendly concrete because of multiple benefits: (1) reducing the amounts of fly ash wastes; (2) the result of this model is a good quality concrete product that gives benefit to society; (3) providing the understanding of Greening TVET to vocational high students; (4) students deepen their competencies by adapting Greening TVET; (5) also growing good cooperation between steam electricity power plant, vocational school, industry in the field of eco-friendly concrete, and market needs. This study reviewed the various studies about the characteristics and optimum mix design of fly ash as material mixture and teaching factory model. The result of study are idea and design of teaching factory model in Vocational High School by using fly ash as cement replacement of concrete mix design.

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Soil organic matter in various land uses and management, and its accuracy measurement using near infrared technology

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IOP Conference Series: Materials Science and engineering 2020年第3期830卷

作者： B H Kusumo A Purwanto H Idris S Sukartono L E Susilowati B Bustan Department of Soil Science Faculty of Agriculture University of Mataram JL. Majapahit 62 Mataram Lombok NTB Indonesia Postgraduate Studies University of Mataram JL. Pendidikan 37 Mataram Lombok NTB Indonesia Department of Mechanical and Biosystem Engineering IPB University Indonesia Forestry Study Program Faculty of Agriculture University of Mataram JL. Pendidikan 37 Mataram Lombok NTB Indonesia

The aim of this study is to investigate the soil organic matter (SOM) status in various land uses and management in Kayangan Sub-District, North Lombok, and its accuracy measurement using near infrared spectroscopy (NIRS). A total of 100 soil samples (0-10 cm depth) were collected from several land uses and management (rain-fed areas, irrigated areas, areas planted 1-3 times with seasonal crops, areas planted with 1-3 perennial plants) in the study area, which were dried, ground and sieved, then analyzed using Walkley and Black method and scanned using near infrared spectroscopy (NIRS). Partial least square regression (PLSR) was used to create SOM prediction models. The results showed that the SOM content varied from very low to moderate with most of them were low. The content of SOM was significantly higher in the irrigated areas compared to that of in the rain-fed areas, and also higher in the areas planted with seasonal crops 3 times a year compared to the areas planted 1-2 times a year. SOM content was higher in areas planted with 2-3 types of perennial plants, compared to with 1 type of perennial plant. NIRS technology was moderately accurate in measuring SOM, which can be used to monitor spatially changes in SOM.

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Comparison of resource assessment methods with numerical reservoir model between heat stored and experimental design: case study Ciwidey-Patuha geothermal field

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IOP Conference Series: Earth and Environmental Science 2019年第1期254卷

作者： Ali Ashat Heru Berian Pratama Ryuichi Itoi Department of Earth Resources Engineering Faculty of Engineering Kyushu Univ. Fukuoka 819-0395 Japan. Geothermal Engineering Study Program Institut Teknologi Bandung Indonesia Jl. Ganesha No.10 Bandung West Java Indonesia.

A successful geothermal field size assessment requires integrative data analysis of all aspects to determine the optimum capacity to be installed. Nowadays, numerical simulation becomes a powerful tool in a geothermal resource assessment process. However, this method involves significant uncertainty of subsurface information as an input. Then a study of resource assessment methods, such as heat stored and experimental design, needs inputs coming from the result/output of reservoir numerical. The calculation of both methods based on a range of reservoir parameter values can be carried out using stochastic methods (Monte Carlo Simulation). It applies a probabilistic method of resource assessment to capture uncertainties. A sophisticated numerical reservoir model of Ciwidey-Patuha Geothermal Field, West Java-Indonesia in the natural state condition was used as a case study to determine the generating potential of the reservoir.

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Monitoring System for Organic Fertilizer Plant Controller Using Solar Energy

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IOP Conference Series: Materials Science and engineering 2019年第1期536卷

作者： Arief Mardiyanto Syamsul Azhar Electronics Study Program Faculty of Electrical Engineering Politeknik Negeri Lhokseumawe Jln. B.Aceh Medan Km.280 Buketrata 24301 INDONESIA

In this applied research, a solar energy powered process control monitoring system of inorganic fertilizer plant with capacity of 300 liters has been developed. The process control system consists of PLC with solar energy panel as its power source and a monitoring process system. The monitoring process system includes a Raspberry Pi minicomputer, an LCD touchscreen, level shifter converters, Arduino Nano, RS485 modules, four analog sensors, and one digital sensor. This system works by collecting temperature, humidity, and gas concentrations data and controlling the heater, exhaust fan, and aerator to maintain desired processing ***-22 digital sensor measures temperature and humidity, pH probe analog sensor measures pH values, MQ-4, MQ-7 and MiCS-2714 measures methane, carbon monoxide, and nitrogen dioxide gases respectively. Analog output sensor is read by PLC's analog to digital converter while digital output sensor is read by 1-wire bus by Arduino. The collected data is send over RS485 to Raspberry Pi. The plant temperature is set constant at 40°C. The heater is turned on at temperature of ≤ 38°C, when temperature reach ≤ 42°C the aerator, exhaust fan, and mixer will be on and will be switched off all together at 40°C. The temperature, humidity and PH are set as the reference of the control process.

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Updating conceptual model of Ciwidey-Patuha geothermal using dynamic numerical model

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IOP Conference Series: Earth and Environmental Science 2019年第1期254卷

A study of Ciwidey-Patuha geothermal field using TOUGH2 reservoir simulation has been conducted. The purpose of this study is to verify and update previous Ciwidey-Patuha conceptual models. The numerical model of vapour-dominated reservoir with steam zone underlying liquid reservoir is constructed based on detail reservoir characterization from geoscience and well data. The reservoir boundary is defined based on TCH (temperature core hole) wells. The distribution of porosity, pressure, temperature and steam saturation are assessed. The model is validated by matching downhole data on pressure and temperature during exploration stage. Then for exploitation stage, the model is validated using reservoir pressure.

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Traceability implementation based on RFID at agro-industry: A review

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IOP Conference Series: Earth and Environmental Science 2019年第1期230卷

作者： D K Hadi P B Santoso Sucipto Department of Agro-industrial Technology Faculty of Agricultural Technology Universitas Brawijaya Malang Indonesia Study Program of Industrial Engineering Faculty of Engineering Universitas Brawijaya Malang Indonesia Halal-Qualified Industry Development (Hal-Q ID) Universitas Brawijaya Malang Indonesia

Information system technology in the agroindustries sector has been developed. One of these is system of traceability based on Radio Frequency Identification (RFID). Before RFID developed identification information of agro-products using a barcode system. Currently RFID implementation in the agro-industry sector to identify product information safety quality tracking and control of the environment is still very limited. In fact RFID implementation petrified decision makers to make a quick decision to directly monitor the movement of agro products through the data or interface with a computer program. This review discusses the development of RFID system in agro-industry. The implementation of RFID for product safety and quality. To implement RFID technology for tracking. The ability of RFID sensor to control the environment around the product. Testing the accuracy of RFID system in the agro-industry. Output application of RFID in the agro-industry is the identification data and a better selection of products to meet the standards and minimize elimination and return of products in global trade.

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