bluuebunny/crossref_metadata_2025_split huggingface dataset:
River engineering for flooding characteristics in the upper-stream part of Bengawan Solo Sub-watershed
Authors: Syaifurahman A , Nurzain D A , Prastica R M S 
Published: January 2021

Abstract
Flooding in Surakarta, which is located in the upper-stream part of Bengawan Solo Sub-watershed, needs further investigation to reduce the disaster impact. This study conducted a flood analysis in the sub-watershed to find out how much the impact of flooding on the river flow that has the risk of flooding due to the overflow of water and extreme weather. The research aims to investigate the hydraulic characteristics of the river in the sub-watershed towards the flooding and identifies the river engineering strategy for mitigation. Based on the results of the hydrological and hydraulics analysis, the existing channel was flooded due to being unable to accommodate the return flood discharge, so a new channel design was needed. The design of new channels is done by widening and being able to deepen the channel. The result of the analysis of the new channel indicates that the capacity could accommodate a discharge capacity of 8915.93 m3/second with its river bank safety factor value of 3.14. In conclusion, river engineering compromises good strategy for flood mitigation in the study area.
The condition assessment scheme for ancient timber structure using material and deformation analysis
Authors: Juan W , Putri A D 
Published: January 2021

Abstract
A condition assessment is one of a crucial part of ancient structure, in which this phase will be the reference before giving a treatment and maintenance. The initial step after the visual inspection conducted will be the material properties analysis to the structure using the Non-Destructive Test (NDT). Furthermore, the deformation analysis will be part of the onsite assessment for long term analysis of a structure. The deformation analysis part has a purpose of determining the movement. This paper will take one of Ancient timber structure as a study case. The building consists of a complex ancient timber structure representing mostly the characteristic of ancient buildings in Asia. Overall, it will focus on discussing the part of the general condition assessment scheme. The general overview of the process of on-site tests and deformation measurement is shown to represent the general need for assessing an ancient timber structure. As a result, the deformation analysis of the structure can the alternative for the next phase as reference for structural damage solutions.
Development of ecosystem health index in rural areas of Java Island: Preliminary results
Authors: Yuwono A S , Wardiatno Y , Widyastuti R , Wulandari D , Natali M 
Published: January 2021

Abstract
The assessment of ecosystem health in Indonesia is currently being conducted poorly since no national guidance standard. This study aimed to formulate a quantitative system to justify the rural ecosystem quality with six indicators, i.e. air pollution index (API), water pollution index (WPI), forest coverage index (FCI), biodiversity index, public health and environmental health. This research is a type of basic and applied research at the same time, where applied research lies in the implementation part of the ecosystem health index. Environmental conditions at rural areas of Java Island (Regencies of Pandeglang, Bandung, Temanggung, Magetan and Bangkalan) was evaluated. Secondary data collection from local environmental management and health authorities was conducted in March-May 2019. The data is expressed into indices with a value of each components ranging from 0 to 100. The ecosystem quality of Bandung Regency, Temanggung Regency, Bangkalan Regency, Magetan Regency quantitatively showing numbers of 67.03, 80.68, 81.76 and 78.66. The four values exceeded the national standard (IKLH, Indeks Kesehatan Lingkungan Hidup) in 2017, i.e. 66.46. It indicates that the ecosystem quality of these four regencies is generally professionally managed. Meanwhile, Pandeglang Regency shows the number of 65.22, which is below the national standard of IKLH.
Measurement of PM10 concentration using hybrid cyclone separator and particle counter
Authors: Purbakawaca R , Yuwono A S , Saptomo S K , Seminar K B , Subrata I D M , Rahmat M , Alatas H 
Published: January 2021

Abstract
Commercial air quality monitoring systems can measure PM10 very precisely and accurately but are expensive to procure and maintain. The research objective was to design a portable, easy-to-handle, real-time PM10 monitor using a particle counter PPD42NS, cyclone separator, vacuum pump, temperature, relative humidity, and air pressure sensors types BMP085 and DHT22. A comparative study of meteorological factors between Vantage Pro 2 and the BMP085 and DHT22 sensors shows a positive linear correlation. The sensor was used to correct the air sample flow rate in the PM10 concentration formulation. The air sample flow rate is stabilized at 0.7 L min−1 so that the cyclone separator can work optimally. The particle size analyzer (PSA) analysis results show that the cyclone separator can separate particles less than ten microns in size at locations with low, medium, and high PM10 conditions. PM10 obtained from the separation process was measured with a PPD42NS particle counter and was successfully converted into mass concentration using a mathematical formula on the microcontroller. The PM10 monitoring system was tested for 24 hours in the wood processing area with a concentration of PM10 278.5 μg cm−3, which was categorized as unhealthy.
Study of spun pile connection with steel jacket strengthening
Authors: Orientilize M , Prakoso W A , Fadel M , Fernaldy R P 
Published: January 2021

Abstract
The amount of spiral reinforcement in the spun pile manufactured in Indonesia is below the minimum requirement. Additional shear reinforcement is needed, particularly on a pile at the adjacent pile cap. To cope with the deficiency, steel jacket is initiated to strengthen the pile. A numerical study was performed to study the effect of steel jacket addition to spun pile behavior. Two different software, SAP and Abaqus were employed. Pushover analysis was performed with a monotonic loading approach. The parameters studied were the steel jacket’s thickness and the existence of adhesive between the steel and the concrete surface. Brittle behavior was detected with the presence of steel jacket which was indicated by the force displacement curve. The steel improves the strength of the spun pile connection but decreases the ductility. It seems that pile is in over reinforced condition. To get a thorough understanding, a 3D model with Abaqus software was performed. Steel jacket is applied on the spun pile without rebar inside concrete fill and thinner steel was selected to prevent over reinforce. Hence, different results were found where spun pile connections behave in a ductile manner. Steel jacket improves not only the strength of spun pile connection but also the ductility.
Utilization of soybean powder as the additional material on calcite precipitation method for improving the strength of liquefiable soil
Authors: Meisnnehr D , Putra H , Yasuhara H 
Published: January 2021

Abstract
This research was carried out to evaluate the addition of soybean in the calcite precipitation method as a soil improvement technique. The evaluated soil was poorly graded and liquefiable sand with a specific gravity of 2.69. The precipitation test was performed to obtain the optimum concentration of grouting solution. Various combinations of soybean and reagent composed of urea and calcium chloride were prepared and were applied to sandy soil through the percolation method. The impacts of soybean on improving the shear strength of treated soil were examined using unconfined compression tests. The result of this study shows that the use of soybean shows a significant enhancement of the soil strength. The strength of 168 kPa was achieved when 60 g/L of soybean added to the grouting solution, which is also promoted a calcite amount of 3% of the soil mass. This research elucidated that the addition of soybean in the calcite precipitation technique is possible to optimize the calcite precipitation method’s applicability as the soil improvement technique.
The behaviour of self-compacting concrete (SCC) with nickel slag as fine aggregate towards seawater curing
Authors: Aswad N H , Mustika W , Tachrir  , Hartono Y D 
Published: January 2021

Abstract
This paper is a continuous study that outlines Self Compacting Concrete (SCC) behavior on high strength concrete with nickel slag as fine aggregate. The percentage of nickel slag substitution as fine aggregate varies from 0% to 100% with an increase of 25%. This laboratory study aims to obtain the effect of seawater curing on the concrete compressive strength. The specimens immersed in seawater for 220 days will provide a SCC behavior assessment towards seawater immersion. The results obtained show that concrete with 25% nickel slag gives the most maximum effect. Compared to concrete without slag, SCC with 25% nickel slag has a higher compressive strength of 17%. Besides, the slump test also showed good condition. All specimens using nickel slag in seawater immersion show greater strength when compared to non-slag concrete. This means that concrete is very suitable at a curing age of 220 days when substituted with nickel slag. The mixture using nickel slag of 100% (SCC100 specimen) illustrates a reasonably stable strength from 28 days of immersion.
Functional design for modification of offshore gas platform to manage bird nuisance: case in Mahakam Delta, East Kalimantan, Indonesia
Authors: Mardiastuti A , Mulyani Y A , Sutrisna T , Hidayat Y , Widodo A S , Agustin I A R , Santosa E 
Published: January 2021

Abstract
Since 2014 offshore un-manned gas platforms near Mahakam Delta have been used by hundreds of egrets sleeping/roosting sites, causing nuisance. The objective of the research was to formulate a management plan in general and to plan a functional construction design to modify the existing construction in order to control the bird nuisance. Field visits were conducted in August 2019 and February 2020 to the gas platform complex (i.e. Dx, TMP-2, D), focusing on Dx Platform, of which its operation will be terminated soon. Basically, Dx Platform will be modified as egret’s roosting site. Attractants need to be constructed on Dx Platform, while deterrents should be placed on other adjacent platforms (D and TMP-2). Some suggested attractants are appropriate perch-sites, construction of cover (from strong sea-wind), provision of twigs and branches as nest material, as well as the provision of shallow water and food (fish). Suggestions for deterrents on other platforms are spikes, wire, and some other innovative mechanical/physical devices, and all are tailor-made for platforms. In addition to the Dx Platform modification, in the long term, the root cause of the bird nuisance needs to be tackled, namely the restoration of Mahakam Delta from excessive fish/shrimp ponds development.
Overview the local barrow material of nickel slag mixture as an aggregate foundation layer
Authors: Sulha  , Sarita Umran 
Published: January 2021

Abstract
Southeast Sulawesi Province has numbered material sources, used as barrow to meet road infrastructure needs. Nickel slag production was a waste material of the nickel mining manufacture carry on to growth in this province. This research is one of the exertions to use waste nickle mining manufacture by mixing local barrow material. The mixture of materials is expected to meet specification of pavement layer for road constructions. This research uses quarry sirtu material in Nanga-Nanga and Lasolo Villages as foundation layer material. The method used is an experimental method on the form of gradation, compaction of modified proctor and CBR test. The result showed that the barrow material with nickel slag composition to material from Nanga-Nanga was 60:40 and Lasolo 50:50 met the grade specification as B class foundation material. Base on the AASHTO classification, this material mixture was included within the A1 category. According to CBR test result with unsoaked compaction conditions, Lasolo material has a CBR value of 26.83% dan Nanga-Nanga material reaches 61.78%. The mixture of material Lasolo is not good enough to be used as a highway barrow material. Whereas mixture Nanga-Nanga with nickel slag is applicable for highway capping layer material.
Range, capacity, and closest evacuation route analysis to tsunami evacuation shelter in Pandeglang Regency Banten Indonesia
Authors: Veronica Y , Sutoyo  , Rau M I , Arif C 
Published: January 2021

AbstractThe Regency of Pandeglang is an area prone to tsunami, so the development of disaster preparedness and mitigation system needs to be done. This study aims to analyze the range of the evacuation shelter, calculate the capacity that can be accommodated by the evacuation shelter, and to identify the closest route to the evacuation shelter in Pandeglang Regency. The study was conducted from March until May 2020. The analysis of tsunami hazard zones shows that area of tsunami hazard zone is 579.68 km2, and located in sub-districts bordering the West Coast and the South Coast. There are 28 evacuation shelter in Pandeglang Regency. The analysis of the range of evacuation shelters showed 52.21% of the tsunami hazard zones were covered, while 47.79% were still beyond the range of the evacuation shelters and tsunami safe zones. The results of shelter capacity analysis showed that the evacuation shelter in Pandeglang Regency could only accommodate 44661 refugees. Pandeglang Regency needed at least 64 new evacuation buildings that can accommodate a minimum of 2592 refugees per shelter. This study identified 38 closest routes to tsunami evacuation shelter and tsunami safe zones in Pandeglang Regency.
Effects of population and land-use change on water balance in DKI Jakarta
Authors: Karunia T U , Ikhwali M. Faisi 
Published: January 2021

Abstract
The raw water balance of DKI Jakarta consists of the needs and availability of raw water in DKI Jakarta. The population growth and land-use changes through the year 2030 led the demand for water to increase every year. The aims of this research are to identify and to evaluate the population of land-use changes that affect raw water needs in DKI Jakarta. Data analysis was carried out by processing and calculating from data that had been obtained based on the reference year (2010). Population growth and land conversion in 2010, it will form a change in land-use in 2030 affected to raw water balance in DKI Jakarta. Cisadane and Citarum Rivers, rain harvest and reverse osmosis becomes an alternative water resource to increase the availability of raw water. The amount of raw water deficit after the application of this strategy was reduced by 37.3% from 9661,536 l/s in 2010 to 3604,931 l in 2030. For eliminating the deficit of raw water required additional alternative water resources other forms of Ciawi Reservoir and IPA Buaran III.
Modelling 2D water table and soil moisture distribution in a field installed with sub surface drainage
Authors: Saptomo S K , Arif C , Suwarno W B , Rudiyanto  , Askari M , Matsuda Hiroshi , Tamura Koremasa , Inoue Youichi , Setiawan B I 
Published: January 2021

Abstract
The present study is part of the development of an environment-friendly water management system based on sub surface drainage technology. It is aimed at creating a multipurpose farmland with expectation of increase in both benefits and productivity. Sub-surface drainage pipes which are installed inside mole-drain, functions as water channel that flows water into the drainage channel. Simulation was run using a 2D numerical soil water flow model based on Richard’s equation. It integrates varying soil textures with aim of figuring the optimum setting of sub-drains in response to soil textures. The depth of sub-drain was established at 40cm beneath the surface for all conditions as it is the current installation available in Indonesia. Our simulation shows the variation of soil moisture and pressure over distance, time and different textures under specified spacing of sub-surface installation.
Functional design of smart evaporative irrigation for mina-padi system in Indonesia
Authors: Arif C , Setiawan B I , Saptomo S K , Taufik M , Saputra S F D , Ardiansyah  , Mizoguchi M 
Published: January 2021

Abstract
The smart evaporative irrigation is offered as an appropriate option in regulating irrigation water more effective. Smart means the system of irrigation is automatically controlled by a floating ball valve based on evaporation and evapotranspiration rate without electrical power. The objective was to evaluate the functional design of the evaporative irrigation on water demand aspect particularly for Mina-padi (paddy–fish farming). The system was evaluated based on the experimental field in the lab-scale since 10 July 2020. There were three irrigation regimes, i.e., continuous flooded (CR), wet (WR), and dry (LR) regimes. During the vegetative growth stage, the smart evaporative irrigation worked well. The irrigation was supplied by a floating ball valve automatically according to the evapotranspiration rate. The actual water levels were well kept and fitted to the setpoint as indicated by low mean absolute error (MAE). The CR regime needs more irrigation water and evaporated more water through the evapotranspiration process. Its rate was highest ranged between 5.81 – 6.6 mm/day. On the other hand, the LR regime has the lowest evapotranspiration rate in between 1.65 – 4.09 mm/day. The irrigation control system became crucial for control the evapotranspiration rate in which less irrigation water evaporate less water.
Biogas Production Comparison of Liquid Anaerobic Digestion (L-AD) Methods on Different Enzyme Addition
Authors: Syafrudin  , Nugraha W D , Kahirunnisa A , Ramadan B S , Miftahadi M F , Yumaroh S 
Published: January 2021

Abstract
Biogas, the gas generated from organic fermentation under anaerobic conditions, is an alternative way to combat the energy crisis. Rice husk is a biomass fuel, and as an agricultural country, Indonesia has not utilized this excessive waste opportunity. Bacteria break down organic matter without oxygen, called the Liquid Anaerobic Digestion (L-AD) method with the minimum condition of 10% total solids (TS) and 25% C/N ratio. Lignin content in rice husk could inhibit the degradation processes, hence pretreatment is a prerequisite. This study was designed to determine the optimum pretreatment concentration variation of amylase and cellulase enzyme (9%, 12%, 15%, 18%) in a persistent chemical condition (NaOH 6%). Within 40 days of observation, both biological pretreatments increased biogas yield contrary. The result showed that the pretreatment of a lower concentration of amylase enzyme (9%) produces a significant biogas yield of about 981 ml or 45.82 ml/grTS. On the other way, higher cellulase enzyme concentration (18%) produced 1520 ml or 70.99 ml/TS. The rate of biogas production were (U) 1.27 (ml/gr/TS.day) for amylase and 4.60 (ml/gr/TS.day) for cellulose.
Metals (Fe, Zn, Mn) retention capacity of modified bentonite clay liner
Authors: Budihardjo M A , Gita D I , Sutrisno E , Ramadan B S , Wardhana I W , Yumaroh S 
Published: January 2021

Abstract
Landfill liner acts as a prevention for the migration of contaminants in the form of leachate into groundwater. Textile industry waste dewatered sludge was chosen as an alternative material for the landfill liner composition. In order to increase the quality of the liner, clay material in the form of bentonite was added to reduce the permeability of the sludge, lime to reduce the potential for damage due to leachate immersion, and rice husk ash to reduce the concentration of pollutants in leachate. Although the analysis of the leachate samples from the Jatibarang landfill is below the quality standard, precautions need to be taken to anticipate changes in the intensity of heavy metals in leachate. Therefore, the liner resistance test was carried out against the parameters of iron (Fe), zinc (Zn), and manganese (Mn) using the falling head method, and the heavy metal concentration test using AAS. Artificial leachate is used to replace the original leachate. The study results showed that the composition of 39% dewatered sludge + 60% bentonite + 1% lime was able to reduce the efficiency of Fe, Zn, and Mn from the inlet to the outlet by 100%, 71%, and 100%, respectively.
Building a development strategy towards community-based tourism (CBT) in Thekelan Hamlet
Authors: Rezagama A , Budihardjo M A , Zaman B , Yohana E , Ramadan B S , Safitri R P 
Published: January 2021

Abstract
Thekelan Hamlet, located in Batur, Getasan, Semarang Regency, has a suitable location as a tourism village. However, tourist activities have not involved the residents as a whole and only focus on enjoying natural tourism. The development of tourism with the concept of education in Thekelan Hamlet has the potential to increase residents’ income through the integration and development of local wisdom in Community Based Tourism (CBT). Thus, tourists can enjoy the beauty of nature and have the opportunity to interact with the lifestyle of its local community. The purpose of this study was to examine the existing conditions of the Thekelan Hamlet to develop a strategy for developing and managing the tourist village of Thekelan Village according to the concept of Community-Based Tourism (CBT). Based on the study results, it was found that Thekelan Hamlet has the carrying capacity as a tourist village in the form of local wisdom of its people, various tourist attractions, and active tourism activities. In developing Thekelan Hamlet tourism, strategies are formulated by integrating the strengths, weaknesses, potentials, and challenges of Thekelan as a tourist village and emphasizing the concept of Community-Based Tourism (CBT), for example, a collaboration between the community and local government, innovation in various service packages tourism and developing the quality of local human resources related to tourism.
Do gender and age affect an individual’s sense of coherence? an environmental psychology perspective of flood survivals in Indonesia
Authors: Maulana H , Gumelar G , Irianda G 
Published: January 2021

Abstract
There is substantial evidence that in the aftermath of a disaster, an individual’s sense of coherence (SOC) plays an important role in promoting one’s sense of well-being. The SOC is regarded as a core component of the salutogenic model of mental health. Disaster survivors are frequently subjected to traumatic experience and have higher psychological distress prevalence rates than people in the general population. The present study aimed to investigate possible socio-demographic differences (gender and age) on the sense of coherence (SOC) among disaster survivors in Indonesia. A total of 194 respondents (71 male and 123 females) from across the country participated in the online survey. A factorial ANOVA using JASP was conducted to investigate the main effects of gender and age groups and the interaction effect of these variables on the SOC level. The findings were two folds, age group variance was significantly associated with the SOC, while gender did not significantly associate with the SOC. The main effect of Age groups was F (2, 962.773) = 4.307, p = 0.005, indicating a significant difference of SOC between young adult, middle adult, and late adult groups. Theoretical implications and future direction of this study are discussed.