bluuebunny/crossref_metadata_2025 huggingface dataset:
An effect of finite reservoir size on pressure gradient generation in a pinched injection sample plug generation in cross design electroosmotic microfluidic device
Authors: Chimsiri P , Chaiwong C , Tongbai C , Pussadee N
Published: December 2019

In performing microfluidic electrophoresis, sample loading must be prioritized since the shape of the initial sample plug injected into the separation channel immensely influences the electrophoretic separation efficiency. Non-zero pressure gradient due to different liquid level in finite size reservoirs is generated as a result of continuous electroosmotic flow (EOF) pumping, resulting in undesired parabolic pressure profile both in the same and opposite direction of sample propagation. This issue could be alleviated by fabricating larger reservoirs which can maintain the liquid level due to gradual volume changing as time elapses. This work presents experimental and numerical study on effect of 3.5 – 8.0 mm reservoir size on Rhodamine B plug flow generation from pinched injection sample loading method in cross design microfluidic device. COMSOL Multiphysics AC/DC module was used in calculating electric field distribution from desired applied voltages. The shapes of the injected sample plugs in the beginning of separation step were studied by varying the time of injection step. The experimental result shows that long-tailed sample plug and pressure profiles were generated when the injection time is 2 minutes or more. For the 8 mm diameter reservoirs, the flow profile illustrates pure EOF plug flow when the injection time does not exceed 1.5 minutes. This implies pressure gradient is virtually disappeared. The result of this study will be later applied for protein transferrin electrophoretic separation.
Electronic structure of nontoxic-inorganic perovskite: CsMgBr3 using DFT calculation
Authors: Kaewmeechai Chaiyawat , Laosiritaworn Yongyut , Punya Jaroenjittichai Atchara
Published: December 2019

We introduce the new perovskite material, CsMgBr3, which is composed of pure nontoxic-inorganic elements by substitution of Cs+ and Mg2+ instead of CH3NH3+ and Pb2+ in a well-known CH3NH3PbI3 perovskite. This study was extracted by using the density functional theory (DFT) with Hybrid functional of Heyd-Scuseria-Ernzerhof (HSE) and the generalized gradient approximation (GGA). The band structures of three diferent phases of CsMgBr3 including α, β and γ- phases reveal that the band gaps of these material are in the ultraviolet region (UV). We found that only γ-phase is the direct band gap material, while others are the indirect band gap materials. The results of efective masses of these compounds show that the mobility of hole is lower than that of electron and the α-phase has the highest hole and electron mobility.
Beam characterization for neutron imaging after installation of the external collimator at TRR-1/M1
Authors: Wonglee S , Chulapakorn T , Pornroongruengchok W , Liamsuwan T , Khaweerat S , Channuie J , Picha R
Published: December 2019

The neutron imaging facility at Thai Research Reactor-1/Modification 1 (TRR-1/M1), located at Thailand Institute of Nuclear Technology (Public Organization) has been improved for non-destructive characterization of internal structure of materials. The aims are to study the beam characteristic after an installation of the external collimator, and to optimize the exposure condition for a new setup. The neutron imaging setup was modified to increase the L/D ratio. As a consequence of the extended distance from the beam port to the sample position, an external collimator was installed to focus the neutron beam since 2018. Moreover, a new sample holder was installed to support sample rotation and translations with increased stability. The experiment was performed at the TRR-1/M1 reactor with 1 MW-reactor power. The neutron beam at the 8-inches south beam port of the TRR-1/M1 was evaluated in terms of beam homogeneity and the relationship between the grayscale value and image quality obtained from a CCD camera. The present performance of the neutron imaging system was tested with an ASTM standard sample, called sensitivity indicator. The results are shown in terms of image contrast and sharpness.
Upgrade of pixel sensor telescope for the characterization of ALPIDE sensor
Authors: Kaewjai J , Kobdaj C , Kittimanapun K
Published: December 2019

A Large Ion Collider Experiment (ALICE) is an experiment station at CERN that detects quark-gluon plasma, a state of matter thought to have formed immediately after the big bang. A plan was proposed to upgrade the particle detector in the Inner Tracking System (ITS) of ALICE by 2020. In the upgrade, new silicon sensor technology, the Monolithic Active Pixel Sensor (MAPS), will be used to replace the ITS. The new sensor is called ALICE PIxel DEtector (ALPIDE). This project focused on the characterization of ALPIDE sensors with a new version of a pixel sensor telescope using the 1.2 GeV electron beam at the Synchrotron Light Research Institute Beam Test Facility (SLRI-BTF). Seven ALPIDE sensors were lined up as a stacked sensor to perform a test using the electron beam at SLRI-BTF. The previous version of the telescope could only characterize the middle area of the sensor; however, the new sensor telescope can be used to characterize edges and corners of the sensor. This advantage provides us with a complete view of the detection efficiency in all sections of the ALPIDE sensor. The detection efficiency of the sensor will be investigated and analyzed by EUTelescope software.
Preliminary design and testing of VAWT blade for low wind speed using CFD
Authors: Akkarachaiphant Thanaphat , Chatthong Boonyarit , Tirawanichakul Yutthana
Published: December 2019

This research aims to study and design vertical-axis wind turbine (VAWT) for low wind speed using computational fluid dynamics (CFD) program called ANSYS® Academic Student Release 19.2. The wind turbine type used is of Savonius type with some parts being modified in order to optimize its rotation in the simulation. The simulation setup is to place the turbine in the middle of the wind tunnel, using initial wind speed of 5 m/s. The turbine itself has dimension of 20 cm of height, 10 cm of radius and 0.15 cm of thickness. These simulation data are used to analyses wind flow dynamics, rotational speed of the turbine, tip speed ratio and Reynolds number of this design. It found that the angular velocity is 200 rpm or 20.94 rad/s, tip speed ratio is 0.41 while Reynolds number is in turbulent flow of 6, 798, 002.
TNT photometric reverberation mapping analysis of high-redshift quasars
Authors: Pongsupa G , Sawangwit U , Wannawichian S , Boonmalai M , Yoyponsan R
Published: December 2019

Supermassive black hole (SMBH) mass determination is essential for understanding the galaxy-SMBH co-evolution. Photometric reverberation mapping (PRM) has been proposed as an alternative to the traditional method, spectroscopic reverberation mapping (SRM), which has limitation to only relatively low redshift, z, and bright objects. However, the most common and important sample of high-z active galaxies known as quasar or QSO have its populations peak at around z ≈ 2-3 thus out of reach for the SRM. We carried out a proof-of-concept campaign of quasar PRM using the 2.4-m Thai National Telescope (TNT) between 2015-2018. Such a study is important to inform a future wide-field high-cadence survey such as the Large Synoptic Survey Telescope (LSST). Our main sample contains 10 quasars at redshift z ≈ 0.7-1.2 with rSDSS
= 19.7-20.7 mag, selected from the SDSS data release 10. The processed data and light curves were analysed using the discrete cross-correlation function (DCF). We used Monte Carlo (MC) simulations to model the noise characteristics and non-uniform coverage of our data as well as to verify robustness of the DCF results. Our analyses show a significant detection of lag time between continuum and broad-line emission bands of the quasar SDSS J081506.93+254124.7 (z = 1.18, rSDSS
= 20.5 mag). The estimated broad line region (BLR) distance is 125±20 light-day which equate to the estimated SMBH mass of (4.3±2.0)×108
M
#x2299;.
The geometric effects of one-dimensional magnetocaloric beds to the efficiency of an active magnetic regenerator: A numerical study
Authors: Yaemphutchong S , Tulyaprawat J , Techapiesancharoenkij R , Hanlumyuang Y
Published: December 2019

Active magnetic regenerators (AMR) are one of prominent alternative refrigeration cycles with a potential to replace conventional refrigerators based on compressed vaper-liquid systems. The magnetocaloric effect of the magnetic bedding solid is at the center of the AMR operation. This work focuses on the numerical investigation of the AMR performances based on the particular designs of multi-layered magnetocaloric beds of 10 layers with the total lengths of 50 mm and 80 mm. The numerical method was based on solving a set of relevant partial differential equations with an interpolating scheme to incorporate the entropic effects of the magnetocaloric beds. Key performance parameters of the two designs were compared against one another. It was found that the choice of 80 mm total bed length yielded only slightly higher performances which implies minuscule economical return in changing the design bed length from 50 mm to 80 mm. The developed numerical scheme allows for the further study of influence of fluid volume flow rate, operating frequency, and utilization to the AMR performance.
The computational study of heat conduction in laboratory using Crank-Nicolson finite difference method
Authors: Saengpayab Y , Kallyalert Y , Pratummasoot N
Published: December 2019

The main propose of this research is to study the heat conduction of an aluminium metal bar in an undergraduate thermodynamics laboratory by using the Crank-Nicolson scheme of finite difference method. Heat conduction was simulated to find the thermal conductivity and was compared with the data obtained from the experiment and theory. In the performed boundary and initial conditions, it was found that the predicted thermal conductivity from the simulation was in agreement with those from the theory, however, it was slightly different from the experiment. These results can be used to improve method to find the thermal conductivity in the laboratory more accurately in the laboratory. Besides, these computational approaches can be an optional teaching method for studying thermal conduction for undergraduates, especially for a laboratory that has limited instruments.
Worksheet analysis for revealing students’ understanding of simple DC circuits
Authors: Kalaya T , Nopparatjamjomras S , Chitaree R , Nopparatjamjomras T R
Published: December 2019

Worksheets are the guideline for students to learn as they can write their own idea, notes, questions, and understandings within the worksheet. Therefore, it is easy to investigate students’ understandings about the topics. In this study, researchers aimed to elicit 70 Thai high school students’ correct understanding and misconceptions of simple DC circuits from their responses on the worksheet. The participants came from 2 schools and attended the simple DC circuits activity. Participants were asked to setup the 3 resistors series and parallel circuits then write down their response to these questions: 1) Which resistor will be burnt first? 2) Sorting amount of the current passing to each resistor and 3) Sorting amount of the potential difference across each resistor. By analysing students’ responses on the worksheet, 3 common misconceptions as 1) Clashing current misconception 2) Stored up and used up current misconception and 3) Closer circuit misconception were found.
Analysis of oedometer and rowe cell consolidation compared to experimental testing
Authors: Zhafirah A , Somantri A K , Permana S
Published: December 2019

Consolidation settlement in clay soils can be predicted by analyzing the consolidation parameters. Consolidation parameters were obtained from the results of a laboratory consolidation test using an oedometer and rowe cell. The rowe cell can measure pore water pressure, soil saturation, and back pressure as a simulation of field condition while the Oedometer cannot. However, there are significant differences between the results of the analysis with the consolidation settlement occurred in the field caused by drainage conditions, the micro characteristics of the soil structure, and the thickness of the soil layer. Therefore, it is necessary to validate the results of settlement in oedometer and rowe cell consolidation analysis with the value of settlement of experimental results. The method used is a laboratory consolidation test using an oedometer and rowe cell as well as a laboratory-scale experimental consolidation test. The results obtained 79% of differences between experimental and oedometer, while rowe cell had a difference of 37% from experimental. Based on this, analysis using rowe cell consolidation parameters can predict a settlement in consolidation in the field more accurately than oedometer, because it has a smaller difference in value.
The water availability effectiveness in weirs
Authors: Permana S , Johari G J , Yogaswara D , Walujodjati E
Published: December 2019

The Availability of water for irrigation is critical in the sustainability of crops. One of the primary water sources to maintain and even increase yields is the river. Mount Galunggung has many sources of water. Cibanjaran River is one of the rivers that originate on Galunggung mountain used to flood an area of 595 ha of rice fields. At present, the river has undergone silting due to sand mining activities next to the weir. The purpose of this study is to determine the effectiveness of the available discharges in the river in meeting the needs of the rice fields that are due to river sedimentation. Available data processing methods are used to analyze the availability and needs of water. Planting plan in November, water requirements in the rice fields are 1.5 lt/sec/ha. The available discharge is not able to meet the needs of 595 ha of rice fields. River sedimentation due to sand mining upstream affects the availability of water because a lot of water overflows above the spillway so that it cannot be utilized. The use of a group system and scheduling water supply provides the right solution in the distribution of water.
Factors affecting competitiveness small contractors in construction industry
Authors: Johari G J , Walujodjati E , Mulyana S , Permana S
Published: December 2019

The construction industry is a very promising business area in terms of infrastructure development and financial benefits. Many factors influence the competitiveness of small contractors in the construction industry. This study aims to identify what factors influence competitiveness and identify what are the dominant factors that affect the competitiveness of small contractors in the construction industry in West Java. The author uses descriptive and explanatory research methods which are then processed by statistical methods using validation tests, reliability tests, and factor analysis. The results of this study indicate that all variables are valid and pass the reliability test. Of the 9 factors studied, it has a significant influence on the competitiveness of small contractors in the construction industry in West Java. There is 1 dominant factor that influences the competitiveness of small contractors in the construction industry in West Java, namely project management factors. These indicators are; Location management, Cost management, Quality management, Time management, Contract management, Problem solving expertise, Risk management, Logistics and supply chain management, Effectiveness in coordination with subcontractors, Effectiveness in site safety management, Knowledge of local construction law, Number of major accidents in The last 3 years, and the contract ratio successfully committed. for project implementation, Coordination of all activities and labor involved.
Optimization of utilization pedestrian trails and green lines in the city
Authors: Susetyaningsih A , Farida I , Zhafirah A
Published: December 2019

Pedestrian and green lanes are needed to increase the comfort of the activities of urban communities to support population circulation, beautify the city, and maintain the air quality in cities. Nevertheless, the condition of pedestrian and green lanes in urban areas is often not well maintained so that their utilization is not optimal. This can be seen from the improper use of pedestrian paths, damage to supporting facilities, and the death of plants planted in the green lane. This study identified the characteristics of pedestrian paths and green lanes in downtown Garut and evaluated the use of pedestrian paths and green lines in urban areas. The method used is descriptive qualitative analysis. The perception of the community of pedestrian users was analyzed from the results of the questionnaire. Respondent was chosen randomly from pedestrian and green lane users along Ahmad Yani road, which is the center of Garut. The condition of the pedestrian path along the Ahmad Yani road from the Asian crossing to the Bunderan Suci was damaged in several points so that it disturbed the comfort of pedestrians. Circulation of pedestrians is also disrupted because some pedestrian spaces are used by street vendors to sell. The pedestrian facilities along Ahmad Yani road are still incomplete, and some of them are in damaged condition. Facilities that are damaged and not as needed are benches, lack of trash bins, and non-lit lighting. Plants in open space, which is a green path are in poorly maintained condition, and many even die. Community perceptions of the importance of the existence of pedestrian lanes and green lanes also influence the awareness of the user community to help maintain and maintain pedestrian paths and green lanes in urban cities.
Correlation accountability, transparency and community participation in financial management of development
Authors: Jaurino J , Kristiawati E , Risal R , Sartono S , Sari W , Sugiardi S , Manurung S S , Muharlisiani L T , Noerhartati E
Published: December 2019

The purpose of this research was to analyse of financial management on transparency, accountability and community participation in development. The method used quantitative research, the independent variables consisting of transparency (X1), accountability (X2) and community participation (X3), and the dependent variable is development (Y), the follow up data analysis used is multiple regression which begins with testing validity and reliability and performs tests of normality, multicollinearity, autocorrelation and heterokedacity. The results showed that the three independent variables consisting of Transparency (X1), Accountability (X2) and Community Participation (X3) towards the dependent variable namely Development (Y) had a positive effect, based on the decision making t test is greater than t table with sig. equal to 0.05 then Ho is declared accepted. Thus, financial management carried out through transparency, accountability and support through community participation can influence development and make an area develop more independently.
An analytical hierarchy process for tofu micro and medium enterprises product plan
Authors: Kurniawati R , Fitriani L , Chandrahadinata D
Published: December 2019

In micro and medium enterprises of Tofu, there is an activity that is done repeatedly and traditionally, namely the cutting process. The cutting process is done by using a kitchen knife so that it is not efficient and able to cause fatigue for the operator. Additionally, there is also the possibility of different cut sizes of tofu because the cutting is done without using a measurement tool. The operator just follows the mild flow on the tofu. The purpose of this study is to plan a manufacture of tofu cutting tools. This study used The Analytical Hierarchy Process method in which this method begins by conducting interviews regarding the choices in level 1, 2 and 3 actions to several respondents. The result from a variety of alternative solutions based on requirements specifications showed that the products of tofu cutters were selected with materials, such as pine wood, strings, handles, naples and naple bolts. This tool will produce tofu whose size is 52 x 52 cm2. The product design is carried out based on the specifications of materials and tools to produce a simple design so that the tofu cutter tool is easy to use and low cost.
Inventory management efficiency analysis: A case study of an SME company
Authors: Islam S S , Pulungan A H , Rochim A
Published: December 2019

The research aims to examine factors that affect inventory mismanagement in a Small Medium Enterprises (SME), which is a market leader in the Heavy Equipment Spare part Industry. Despite its status as market leader, the company deals with various inventory problems, for examples slow-moving stocks, delivery delays to customers, and so forth. Those problems, at the end, may reduce company’s profit. In order to determine the main factors, this study applies quantitative and qualitative methods. Quantitative methods, specifically Pareto diagram and Inventory Turnover Ratio (ITR), are mainly used to evaluate sales and inventory management. ITR is affected by spare part quantity, warehouse area used, and the material amount. The top five ITR ratings are examined further through observation, interview, and questionnaire techniques. Meanwhile, the qualitative method is applied to evaluate the company’s inventory information systems, procedures and coordinations among departments, and human resources. Our findings suggest that the unintegrated company’s information system and lack of qualified human resources are the main factors affect inefficient inventory management. The research benefits to industry by suggesting the importance of information systems and human resources to inventory management. As for academics, this research enriches inventory management literature.
Multimedia development of carved slippers to improve student skills in craft and entrepreneurship subjects
Authors: Hendrawan R F , Musfiriyah N , Suliyanthini D
Published: December 2019

This study aims to develop learning media for craft and entrepreneurship subjects. After undergoing preliminary research on students needs for this particular subject, the authors consider technology-based learning media to needed in the process of learning carved sandals. This research was developed based on Borg and Galls research model as the main design, and ASSUREs instructional design as a sub-design in developing instructional media in the form of DVD (Digital Versatile Disc) entitled Tutorial Carved Sandals. Based on the results of the expert validation test it was concluded that the product was feasible to be used as a medium with a yield of 3.55 or 88.75%, and was very well used as a learning medium in large group trials with a return of 3.43 or 86%. This DVD has tested in 3 secondary schools in Central Jakarta in learning Crafts and Entrepreneurship in making handicraft products with the inspiration of non-objects culture.
Grouping porosity permeability in deep marine sediment to analogue oil and gas reservoir: A case study Brebes Central Java
Authors: Herdiansyah F , Burhannudinnur M , Syavitri D , Ovinda O
Published: December 2019

Study area is located in Rambatan river and Ciseureh river Malahayu Brebes Central Java. Porosity and permeability are very important to oil and gas industry. Porosity is a measure of the void spaces in a rock and is a part of the total volume rock. Permeability is defined as the ability of a rock to transmit fluids. Deep-water gravity flow or deep marine reservoir are important exploration targets worldwide and there is complicated when little subsurface data available. Porosity and permeability analysis from outcrops data may considered as the data used in this study. The result from four measuring section show there is thin intercalated limy sandstone, marl, and calcareous shale. 14 outcrop samples was carried out the helium porosimetry for porosity permeability value and was examined thin section analysis for fabric discussion, and 2 samples was calcimetry analysis. Lithology are generally contains many foraminifera from very fine to fine grained and mostly moderate grained on inner-outer fan environment. Sedimentary structure represent slope sedimentary structure such as graded bedding, lower lamination, slump bedding, ripple, convolute ripple, cross lamination, and trace fossil as feature of deep-marine deposits. 8 samples from 14 samples limy sandstone are likely to be good reservoirs.
Suggested normal production operable day for Kasim oil refinery in Indonesia
Authors: Prima A , Satiyawira B
Published: December 2019

Last several years, a number of mainstream mass media often reported several recurring refinery unplanned shutdown in Indonesia, one of which is Kasim refinery. As a result, the disruption of fuel production was unavoidable. This particular study aims at finding qualitative correlation between the prior working performance and the current performance of a refinery. In general, unplanned shutdown should be explained as to the optimized refinery utilization occurred in Indonesia. The study also compares the result of the result with that of the previous study by Matthew Cheses. The method being applied in this study is qualitative approach using a non-linear multivariable regression. As the result, a non-linear multivariable regression that incorporates multivariable in an effort to help discover the presumably overlooked information of the past performance as means of management control and to monitor the current refinery utilization performance. In the end, recommendation for improvement as far as the refinery utilization can possibly be achieved in the near future. The conclusion of this particular study is the recommendation for refinery decision maker to improve the scheduling of refinery turnaround and optimize the utilization as well within the recommended range of refinery operation.
Geographic information system for mapping public service location
Authors: Kurniadi D , Mulyani A , Septiana Y , Akbar G G
Published: December 2019

This article aims to analyze, design, and development public service location mapping system based on Geographic Information System (GIS). GIS technology is a useful information system used in making information systems for mapping areas and locations accurately so that it can make it easier for people to obtain information on the distribution of places of public services and facilitate the path to the site. Data used is sourced from external data and observational data in the field. The software development model uses the Rapid Application Development approach which consists of four phases namely, planning requirements, user design, construction, and cutover. The results of this study are applications for mapping the location of public services that have features of fast search, geo-maps, know the nearest public service, add data by users with the login feature via social media, and features easy access via Android smartphone. With the development of this application, hoped that it could provide benefits to facilitate and accelerate the community towards the location of public services without being limited by space and time.
Comparison of genetic algorithms and Particle Swarm Optimization (PSO) algorithms in course scheduling
Authors: Ramdania D R , Irfan M , Alfarisi F , Nuraiman D
Published: December 2019

Making lecture schedules is a complicated matter because it involves many parties and resources. In order to arrange the schedule optimally, a method is needed that can produce the best optimization value. In this paper, we will discuss the comparison of Genetic Algorithms and Particle Swarm Optimization to design lecture schedules. Once implemented, then comparative analysis of the results of the course scheduling process is carried out by comparing the fitness value and execution speed of the two algorithms. The results showed that in the 25th iteration the Genetic algorithm succeeded in compiling a lecture schedule with the best fitness value of 0.021 and 9.36 second execution time compared to the PSO algorithm which produced a fitness value of 0.099 and execution time of 61.95 seconds in the same iteration. This proves that the PSO fitness value outperforms the Genetic Algorithm, but the Genetic Algorithm execution time is faster than the PSO algorithm.
The proposed information system design to improve new students
Authors: Heryanto D , Sutedi A , Cahyana R
Published: December 2019

This study discusses the design of digital monitoring system to monitor prospective new students, the aim of which is to measure the quantity of prospective new students and as a media to help decision making in the future. The method used in this study is the Mobile Development Life Cycle. In building an application on cellular, there is an examination called process, the process in software development is called Software Development Life cycle which functions to check the whole phase in MDLC which includes the Inception, Design, Development, Stabilization, Deployment phases. Apart from the process, there is also a consideration when building a mobile application is checking the influence on the development of the cellphone itself. The results obtained from this study are prospective student data including contact numbers that can be followed up by the admissions committee.
Architecture information system for zakat, infaq and sadaqah management institutions
Authors: Setiawan R , Nashrullah M R , Mulyani A , Mubarok M S
Published: December 2019

Indonesia had potential zakat as much as 217 Trillion Rupiah in 2017, but can only be collected 6 trillion or 0.2%, one of the factors is Muzakki’s (Zakat Giver) lack of trust in zakat management institutions so that they prefer to distribute their zakat without going through zakat management institutions directly. To encourage improving management of zakat management institutions requires planning, designing, and building systems that can assist in managing zakat. This study aims to design an architectural enterprise for zakat management institutions in achieving the collection, management, utilization, and distribution of zakat and alms. The methodology used in this study uses the TOGAF ADM approach by collecting data through observation and interviews with one of the private zakat management institutions. The results of this study are in the form of a system architecture design that can be used as a reference for zakat management institutions with a prototype of the zakat reporting system.
What does the software requirement specification for local E-Government of citizen database information system? An analysis using ISO/IEC/IEEE 29148 – 2011
Authors: Susilowati M , Ahsan M , Kurniawan Y
Published: December 2019

The management citizen database is Improper and not up-to-date will results decisions that are not strategic for the village development process. Inappropriate citizen data also results in long-term ineffective local government planning processes. Such as the problem of forecasting or predicting the level of growth of citizens as well as the need for development services which are part of the medium-term long-term plans of local governments. Therefore they need requires a citizen database information system. In connection with the needs of citizen database information systems, this study provides a solution of analysing documents, namely the requirement specification software for citizen database information systems using the ISO / IEC / IEEE 29148 edition of 2011. The study was conducted with case studies of 6781 management data of residents of the village of Sumbersekar, Malang Regency, East Java. The method to execute the research consisted of data gathering stages, data flow and decision analysis, and the last is create software requirement specification. the specific requirements of the SRS documents ISO / IEC / IEEE 29148 2011 edition are external interfaces, functions, usability requirements, performance requirements, logical database requirements, design constraints, software system attributes, and supporting information.
The design and evaluation of an automatic watering system by using Fuzzy Mamdani
Authors: Rohadi E , Amalia A , Nidianingsih A , Arief S N , Ariyanto R , Wibowo D W
Published: December 2019

The fruits and vegetables are high demand commercial commodities recently. In this work, small spaces are addressed as modern vegetable cultivation in order to fulfill family member vegetables daily needs. The automatic watering system with a soil moisture sensor, a temperature sensor, and periodically watering based on Fuzzy Logic can provide water to vegetables according to their needs is proposed. In the practical, the Chinese Green Cabbage has been watered with the automatic system consists of raspberry pi, temperature sensor, soil moisture sensor, and timer. Both data of soil moisture sensor and temperature sensor are sent to Raspberry Pi that set an optimum condition of the Chinese Green Cabbage cultivation. The watering system is working when the conditions of the soil moisture less than 35% and the temperature of more than 29°C, respectively. However, the automatic watering by using the timer as 30 seconds of watering on 09.00 AM and 03.00 PM is needed. This system has succeeded in applying the Fuzzy Mamdani method to determine the length of watering on Chinese Green Cabbage. As a result, the automation system is promising for the cultivation of vegetable plants around the home living.
Total nitrogen in rice paddy field independently predicted from soil carbon using Near Infrared Reflectance Spectroscopy (NIRS)
Authors: Kusumo B H , Sukartono S , Bustan B , Purwanto Y A
Published: December 2019

As nitrogen (N) is needed at the greatest amount for the plant growth, the addition of adequate amount of this nutrient in rice paddy field is one of the key factors for maximizing the rice production. Knowing the spatial soil N status in the rice field measured using conventional analysis takes time and expensive. Many previous researchers reported that near infrared spectroscopy (NIRS) was able to successfully predict soil N due to its high correlation to the soil carbon (C). The aim of this research is to test whether NIRS able to predict soil N content, independently predicted from soil C. Soil samples in 147 locations, including the coordinates, were collected in rice paddy field of Lombok Island, Indonesia. Parts of the samples were analysed in a laboratory using conventional analysis for total N and total organic C, and the other parts were scanned using near infrared spectroscopy (NIRS) for spectral data collection. A Partial Least Square Regression (PLSR) calibration model was developed using laboratory-analysed soil N (and C) data and soil spectral data. Although soil N and soil C have a poor correlation, but both can be predicted well using NIR technology, indicating the soil N was independently predicted from soil C. This finding shows that soil N content in rice paddy field of Lombok Island can be predicted and monitored by NIRS without depending on its high autocorrelation with soil C.
Biodegradation of LLDPE plastic by mixed bacteria culture of Pseudomonas aeruginosa and Brevibacterium sp.
Authors: Dwicania E , Rinanti A , Fachrul M F
Published: December 2019

Plastics take more than 400 years to naturally degrade. This study therefore aims to degrade Linear Low Density Polyethylene (LLDPE) plastic using a mixture of culture bacteria Pseudomonas aeruginosa and Brevibacterium sp. Pieces of LLDPE plastic measuring 1 x 1 cm2, weighing 10 grams are put into containers containing Nutrient Broth (NB) growth media. The biodegradation process is carried out for 30 days with the test parameters being temperature (°C) and acidity (pH). The Gravimetric method was used to determine weight, while Fourier Transform Infrared (FTIR) analysis was used to actuate the morphology, changes in structure and surface of polyethylene. The results showed that mixed bacterial culture has the potential to degrade LLDPE plastic with a removal percentage of 2-7%, which is based on gravimetric analysis at 25°C, acidity value (pH) 7 for 30 days. Therefore, this study proves that mixed bacterial cultures degrades LLDPE plastic by using it as a carbon source.
Mapping and analysis of illegal solid waste heap point at segment 6 Ciliwung riverbanks
Authors: Saska L A , Riatno P P P , Indrawati D
Published: December 2019

The research about illegal heap point of solid waste was conducted to identify the quantity, measure the volume and compositions of solid waste heap point as a response to river pollution caused by solid waste along Segment 6 Ciliwung Riverbanks. Calculations of the volume and compositions of solid waste were carried out for three days in five locations are riverbank in area of Manggarai (Location 1), Kebon Manggis (Location 2), Menteng (Location 3), Kwitang (Location 4), and Kebon Sirih (Location 5). The research shows that there are 22 illegal heap points consisting of 93.38 m3 solid waste volume. The highest volume of the illegal heap point of solid waste was located in Kebon Manggis Area with 34.64 m3 and the lowest volume was located in Kebon Sirih Area with 1.53 m3. The average compositions of solid waste consisting of 45.56% organic waste and 54.44% non-organic waste with the highest percentage are the plastic waste 18.6% and the lowest percentage is rubber/leather waste 2.01%. The existence of the illegal heap point of solid waste in riverbank has the potential to cause a high value of Biological Oxygen Demand (BOD) and Chemical Oxygen Demand (COD), and cause low levels of Dissolved Oxygen (DO).
Study of bioremediation techniques as a process for making organic cosmetics plants fertilizers
Authors: Nursetiawati S
Published: December 2019

Bioremediation is one technique to reduce environmental pollution and renew soil with the help of microorganisms and plants. The process carried out includes detoxification of toxic chemicals by cleaning the environment naturally and economically. This study aims to identify waste recycling, modification of ecology-based farming systems, and test traditional plants as a source of bioremediation. Then, bacteria and bioremediation results will be used as liquid fertilizer. Liquid fertilizers are processed through bioremediation techniques, then reused as nutrients for organic cosmetics plants. The research method is carried out qualitatively and its application is in a polluted environment. The research findings state that there is a positive impact on reducing environmental pollution, especially in reducing the volume of waste and the smell of garbage. Meanwhile, the success of bioremediation in liquid fertilizer depends on the Hydrogen (H2) cycle. In addition to H2, there are carbon (C), sulfur (S), and nitrogen (N) during the bioremediation process which encourages the bioremediation of liquid organic fertilizer to be able to fertilize the plant source of organic cosmetics. Thus, cosmetics can be said to be organic as a whole.
The effect of temperature and concentration of Aspergillus fumigatus on chlorpyrifos removal
Authors: Anggreini C D , Tazkiaturrizki T , Rinanti A
Published: December 2019

Chlorpyrifos is a toxic organophosphate type of insecticide with a molecular formula of C9H11Cl3NO3PS. Bioremediation is an environmental friendly method used to combat this insecticide through microbial enzymatic activity. This study therefore aims to eliminate chlorpyrifos with temperature variations and concentrations of Aspergillus fumigatus. Aspergillus fumigatus fungi acts as bioremedian to degrade the activity of chlorpyrifos using temperature ranges of 25-35oC at a 0.5-1.5% concentration rate. However, using the Gas-Chromatography Mass Spectrometer (GC-MS) method, optimum chlorpyrifos degradation was achieved at 25oC with a 1.5% concentration for 5 days in potato dextrose broth (PDB) liquid media. This shows that A. fumigatus has the ability to remove chlorpyrifos with an efficiency of 95.92% from its initial concentration of 80 ppm.
Efficiency of constructed wetland using vetiver plant (Vetiveria sp) to reduced BOD and COD Concentration in greywater
Authors: Wasita D H , Hadisoebroto R , Fachrul M F
Published: December 2019

Constructed wetland is engineered, man-made ecosystems as a wastewater treatment unit to reduce water pollution by using plants. The purpose of this study to know the efficiency of Sub-Surface Flow constructed wetland with Vetiveria sp. in domestic wastewater treatment and to reveal the effect of aeration and detention time to reducing BOD concentrations in domestic wastewater. The research has been conducted in a constructed wetland located in Srengseng Sawah Village of continuing aerated reactor and without aeration as a control reactor. Detention time (days) 2 and 3 ware setup, then the sample was taken for BOD concentration. The results indicated that constructed wetland with aeration and detention time 4 days had a higher performance to remove BOD up to 90% than without aeration and less than 4 days’ process. These results fulfil the requirement of the quality standards of the Decree of DKI Jakarta Governor No. 122 of 2005 and Decree of the Minister of Environment No. 112 of 2003.
Effect of Soluble Soybean Polysaccharides (SSPS) concentration and SSPS/PVA ratio on characteristics of biodegradable plastic
Authors: Yusmaniar Y , Syafei D I , Arum M , Arfiansya R , Handoko E , Kurniawan C , Budi S , Yulianti E
Published: December 2019

This study aims to determine the effect of Polyvinyl alcohol (PVA) and Soluble soybean polysaccharides (SSPS) and to characterize it (water resistance and biodegradation test). This research was done by blending (mixing) PVA, SSPS, acetic acid, and maleic anhydride. From the results of infrared spectrum analysis on plastic films showed peaks in the area 1000-1100 cm-1 which indicates the absorption of polysaccharides. This plastic has an optimum water resistance in the ratio between 1:1 w/w (SSPS: PVA). Optimum biodegradation test results in the ratio of 1:1 w/w (SSPS: PVA). Based on the result of the research, it can be concluded that water resistance and biodegradation reach optimal on composition 1:1 w/w (SSPS: PVA).
Geomorphological impact of Palu earthquake
Authors: Anugrahadi A , Sumotarto U , Purwiyono T T
Published: December 2019

Sulawesi and Maluku islands are tectonically under a collision area of four earth crust plates, those are Eurasia, Philliphines Islands, Pacific Ocean and Australian-India Ocean. Palu city in Central Sulawesi island in particular is geologically an area of complex structure. A fault zone of north-west to south-east direction has formed Palu area as a block being squeezed by Palu-Koro strike-slip fault zone. The aim of this research is to know the impact of earthquake happened on October 28, 2018 has caused the fault to activate of being dynamic movement of the area. Using hand camera photos, a morphological survey and analysis show the landslides and slumps could be clearly identified. Rock and soil slide and movement was also strengthened by liquefaction of hydrological fluid content within the Palu block. Morphology of Palu-Koro fault plane was also affected significantly causing landslides and slumps on the fault plane exposed in the earth surface.
Comparison between moving windows statistical method and kriging method in coal resource estimation
Authors: Marwanza I , Nas C , Azizi M A , Simamora J H
Published: December 2019

The calculation of coal resource estimation is generally done by a conventional and nonconventional method. This research uses a nonconventional method of Moving Windows Statistical (MWS) and Kriging using 3-dimensional calculation boxes area with dimensions of 100 m x 100 m, 200 m x 200 m, and 300 m x 300 m, which is processed using MWS and SGems software. The desired value is the comparison of average coal thickness value produced from basic statistics, Inverse Distance Squared (IDS), and Kriging, and also the estimation of coal resources. By using MWS, the obtained average value of coal thickness for area 100 x 100, 200 x 200, and 300 x 300 are 6.40 m, 6.24 m, and 6.03 m, respectively. From IDS the value from 100 x100 box is 6.38 m, 200 x 200 is 6.16 m, and 300 x 300 is 5.94 m, while the calculation of Kriging using Sgems generates 5,77 m of coal thickness in 100 x100, 5.68 m in 200 x 200, and 5.8 m in 300 x 300. Coal resource estimations using these three different areas of the box have also been carried out, resulting 943,480 tons, 526.460 tons, and 327.450 tons of coal in 100 x 100, 200 x 200, and 300 x 300. In the comparison of the average value of coal thickness between values determined from basic statistics, IDS, and Kriging on each area it is found that the value did not change significantly but the value from the Kriging method is the most accurate because of the influence of spatial variation of data where one point with the other point influences each other.
Neutralization, coagulation and filtration process in peat water
Authors: Parabi A , Christiana R , Octaviani D , Zalviwan M , Noerhartati E , Muharlisiani L T
Published: December 2019

The research purpose is to find out about neutralization, coagulation and filtration processes in peat water. Water is an environmental component that has a considerable role and the requirements in terms of quality and quantity. This research method uses experimental design and the variables are the processes of neutralization, coagulation, and filtration of peat water. Descriptive statistical analysis is an analysis carried out to assess the characteristics of a data. The results of the research were from the initial test obtained pH = 4.32. There are some changes from all parameters starting from dark black water colour (1088 PtCo) to 179 PtCo, high turbidity (13,2 NTU to 6,55 NTU, high iron content (1,68 mg/L) to 0,26 mg/L, high chromium (0,093) mg/L to 0,023 mg/L), low acidity (pH) (4,32) to pH 5,57 and high sulphate (744 mg/L) to 24 mg/L. The conclusion is that the results of processed Rasau Jaya Umum village peat water is feasible in accordance with the quality standards of the Regulation of the Minister of Health of the Republic of Indonesia No. 492/MENKES/PER/IV/2010, that the levels of iron, chromium and sulfate are already at a value permitted, but the turbidity of the water is still high and the pH of the water shows that the water is still acidic, amounting to 1080 PtCo. Therefore, water variations in the amount of material used in the peat water installation process still need to be improved in order to obtain maximum results.
Utilization of rice wastewater as an alternative medium for growth and quality of Shiitake mushrooms (Lentinula edodes)
Authors: Setiati Y , Chaidir L , Saputri A , Roosda A A
Published: December 2019

Multiplication of Shiitake (Lentinula edodes) as a pure breeding commonly uses Potato Dextrose Agar (PDA) as the medium. Further, the cost of its basic material, which relatively expensive needs an alternative medium to produce pure brood stocks for Shiitake and to reduce the cost of producing pure brood stocks such as utilizing rice wastewater. Rice wastewater known to have composition as complete as PDA. The research aimed to find the utilization of rice wastewater as Shiitake mycelial growth medium and determine the best concentration of rice wastewater medium on the growth rate and quality of Shiitake mycelium. The research used an experimental with descriptive analysis method consisting of 11 treatments of rice wastewater concentration i.e. 50%, 55%, 60%, 65%, 70%, 80%, 85%, 90%, 95%, 100%, and PDA as the control, all treatments were replicated three times. The results showed that various concentrations of rice wastewater affected on the growth rate of Shiitake mycelium. The concentration of 100% rice wastewater produced the best growth and quality of mycelium compared to other treatments. Therefore, the rice wastewater can be used as an alternative medium to multiply pure broodstocks of Shiitake mushrooms.