bluuebunny/crossref_metadata_2025_split huggingface dataset:
Study of Hydrogeomorphological Springs in Tlegung Watershed, Kulonprogo Regency
Authors: Santosa L W , Narulita R L 
Published: March 2020

Abstract
The spring characteristics such as spring discharge, temperature, EC, TDS, pH, spring stream character, and spring emergence type can be linked to geomorphology. This link is the main study in this research. This research was conducted in Tlegung Watershed, which is mostly located in Samigaluh and Kalibawang District, Kulonprogo Regency. The purposes of this study are to determine the springs distribution pattern and the springs hydrogeomorphology characteristics, also to analyze the hydrogeomorphological factors which control the springs’ emergence and characteristics. Data collection method which used in this research is survey method to determine the source of spring emergence, measure spring discharge, test springs’ physical and chemical quality, and validate geomorphological interpretation. The other method which used is collecting secondary data from institution such as RBI maps, geological maps, satellite imagery, etc. The result showed that all springs in Tlegung Watershed classified as perennial springs and gravitational springs with depression, contact, and fracture springs type. Springs discharge in the Tlegung Watershed are classified in Q3 class (10-100 liters/sec) to Q5 class (<1 liter/sec). Electric Conductivity (EC) of all springs are classified in the EC1 (fresh water) with an average of 229,24 μmhos/cm, whereas the average value of TDS is 116,09 mg/L. The value of EC and TDS in the upstream watershed tend to be lower than the value of EC and TDS in the middle and downstream watershed. Hydrogeomorphological factors that control the emergence and characteristic of springs, including rock contact between old vulcanic rocks and limestone, crack structures found in andesitic breccia rocks, and slope class changes between slope 13-20% and 20-55% and 20-55% and 55-140%.
A groundwater tracing investigation to determine Kalisirah Karst Springs catchment area, Kebumen Regency, Central Java
Authors: Astuti E S , Rahmawati A I , Setyawan A , Alghozali Q , Agniy R F , Fauzi D R , Mahrizkhal D S , Nurkholis A , Pratama A D , Dwiputra D S , Laksono G E , Siswanto A D , Adji T N , Haryono E 
Published: March 2020

Abstract
Water tracing was conducted at Karangbolong Karst as a rapid assessment of the Kalisirah spring hydrological characteristics. This study was conducted to determine the movement of underground flow and the estimation of the Catchment Area using the Todd Nomogram and field observations. The results of flow tracing tests conducted in Pocung Cave indicate that there is underground river network connectivity between Pocung Cave, Jeblosan Sinkhole and Kalisirah Springs. Based on topographic survey and flow tracing test, the calculation of the estimated area of the Kalisirah catchment area is 180 Ha. The results were also validate using other parameters, namely flowrate and rainfall in the research location using Todd Nomogram. The estimated area of the Kalisirah catchment area with the Todd Nomogram is 189.2 Ha. The calculation of the estimated area of Kalisirah catchment area based on topographic survey and water tracing is relevant with the estimated area with Todd Nomogram. Groundwater tracing investigation can be used to determine karst spring catchment area, as a preliminary study to understanding the karst hydrology.
Study of shrimp pond effluent purification on mangrove ecosystem of River Pasir Jangkaran Village Kulon Progo Regency
Authors: Damayanti E , Suprayogi S 
Published: March 2020

Abstract
The research is located in Pasir River, Jangkaran Village, Kulon Progo Regency. Landuse in Pasir River are dominated by shrimp ponds. Mangroves on the riverbank can reduce the concentration of nutrients in shrimp pond effluent. This study aims to determine the purification of shrimp pond effluent in the mangrove ecosystem by comparing the quality of shrimp pond effluent before and after passing through the mangrove ecosystem. The research method used is the field survey method and laboratory analysis. Water sampling and identification of mangrove characteristics were done purposively on 6 observation segments. Data analysis was performed graphically, descriptively, spatially, and comparatively. The results show that mangrove ecosystems can reduce concentration of nitrate and phosphat in shrimp pond effluent as evidenced by a decrease concentration of nitrate in segments 1 to 6. The nitrate concentration in the mangrove ecosystem and after passing through the mangrove are smaller than before passing the mangrove. The characteristics of mangroves that affect the purification process are species and density of vegetation. Species mangrove Rhizophora mucronata with higher vegetation density can reduce the concentration of nitrate in SPT 1 to 4 better than species Avicennia marina with lower density in segment 5.
Discovering the river outlet current by using simple field measurement (case study of Kendal Coastal Area)
Authors: Trihatmoko E , Sadewa Wiguna H , Juhadi  , Sunarto  , Aris Marfai M 
Published: March 2020

Abstract
Theoretically, in the natural condition the wind is main energy induce wave and sea surface current. The measurements related to the wind patterns may indirectly reflect the condition of waves and the sea surface current. Other theory stated that in some cases, sea surface current has different direction depending on the bathimetry condition or other local factors. This research aimed to discover the correlation between wind and sea surface current direction in Kendal Coastal Area, focussing on nearshore zone nearby Bodri Rivermouth. The research was conducted by a simple measuring instrument for detecting sea surface current direction. The background of this research was the occurrences of the lost people drowned in the research area and being related to the mystical phenomena by the coastal community. The results showed that the correlation values of the wind and sea surface direction up to 0.40 and 0.09, each for point 1 and point 2, respectively. Those differences between wind and sea surface current direction imply that the results against the first wind direction theory. However, the results revealed that the existence of river mouth is the main factor that influences the different pattern of the sea surface current and wind direction. It is proof that the outlet current exists in the research area.
Unit hydrograph method for curve number validation in hydrological modeling: case study of Welaran Watershed, Karangsambung, Kebumen
Authors: Hadi M P , Syamsiyyah N J L , Annisa L 
Published: March 2020

Abstract
Unit hydrographs, which have long been used in hydrological analyses, assume or require evenly distributed rainfall as their input. In practice, such a requirement is met when the methods are applied to small watersheds. This study aim to validate the curve number in hydrological modelling used unit hydrograph. The Welaran Watershed in Karangsambung has an area of 11.6 km2. More than 50% of it is covered by rice fields, while the rest is by dry agricultural lands, multiple-species plantations, and settlements. This watershed has been installed with a stream gauge equipped with AWLR and ARR. Based on the automatically recorded flood and rainfall data, a hydrological analysis was performed to generate unit hydrographs. Baseflow (losses), separated from the hydrograph, was compared with a loss of water using the Curve Number (CN) method. CN was derived from a reference table containing land use (LU), soil hydrological group, andantecedent moisture condition (AMC).The CN of the study area was 67, which is the weighted value of the mapping unit. Insome rainfall-runoff events, the unit hydrograph approach yielded curve numbers varying between 23-82 for eight selected rainfall events. It indicates that many factors shape the diversification of rainfall-runoff interaction in a watershed, including the actual distribution of rain. Also, AMC seemed to be distributed according to not only the amount of previous rain but also other factors that need further study.
Determination of reaction rate constant for increasing pH level in geothermal hot spring
Authors: Mauren B C , Kharisma N I , Harto A W 
Published: March 2020

Abstract
Geothermal hot spring can be used as source of hot bath. It contains mineral elements such as Cl−, K+, Na+, and SO4
2−. One of geothermal hot springs in Leilem, Sulawesi Utara, is categorized as Acid Sulfate Water. Leilem geothermal hot spring contains high acid sulfate and causing the pH level reach to 1. Leilem hot bath is categorized into acidic type. In order to reach mildly acidic type, the pH level should be up to 4. The method research to increase the pH level is to flow the hot water to the stack of CaCO3. To design the system, the reaction rate constant should be known. These constants are assumed to follow the Arrhenius’ equation, k = A e^((-Ea
)/RT).The value of frequency factor (A) and activation energy (Ea
) are collected through a laboratory scale experiment of H2SO4 with CaCO3 (powder) by using variant variables of the temperature of water and the mass of CaCO3. Based on the result of the experiment the value of A is 1.8 and Ea
18.515 J(gmol)−1 and the research successfully increases the pH up to 4 or even higher.
Water balance evaluation in Penanggungan hamlet Wanayasa sub district Banjarnegara, district Central Java province
Authors: Rachmawati W S , Suryatmojo H , Ngadisih  
Published: March 2020

Abstract
A key issue of watershed management in Indonesia is massive forest conversion in the upstream area. Forest conversion to agricultural land occurred in the Merawu watershed. Penanggungan Hamlet located in the upstream area of Merawu watershed, where the economic resources is potato (Solanum tuberosum L) farming. The agricultural and domestic water needs are supplied by 5 springs water in the surrounding areas. Intensive farming needs a large portion of water. Inefficient water utilization pattern and the El Nino phenomena may raise water competition among agricultural and domestic sectors in Penanggungan. Deficit water was occurred in the Penanggungan Hamlet, particularly in the dry session. The purpose of this study is to evaluate the water availability based on regional water balance and design the drought mitigation. Regional water balance focused in terms of demand and supply. The water demand covers daily household needs such as cooking, bathing, toilet, washing dishes, laundry, cleaning the floor, washing vehicles, watering yards, and drinking. The demand likewise comes from farming sectors for irrigation and pesticide application. The demand calculated for one year. A water need census in Penanggungan was conducted to acquire data on the amount of water per sector. Water supply calculated from the discharge of 5 springs for one year. Prediction of water needs used three parameters i.e., population, total household and agricultural water needs. This study reveals that the water demand in Penanggungan Hamlet is surplus until 2031 but in 2032 until then it experiences a deficit.
Spatio-temporal mapping of ecotourism activities in Buleleng conservation zone: a methodological review
Authors: Mutaqin B W , Marfai M A , Helmi M , Rindarjono M G , Windayati R , Sunarto  
Published: March 2020

Abstract
In Bali, economic benefits from tourism in 2017 is IDR 50,241.07 billion and unfortunately still dominated by districts in the south and the east of Bali, e.g., Badung, Denpasar, and Karangasem. Better coastal environment conditions in Buleleng District, environmental problems related to water quality and domestic waste management in the south and the east of Bali, as well as Buleleng new airport planning in 2025, will undoubtedly be a turning point to economic competitiveness in this area. This review represents brief information of the methodology that can be used to identify and to map ecotourism activities spatially and temporally. With this review, the purpose is to give information and solution related to several methodologies, which can be used to address constraints that can lead to inappropriate expectation concerning the outcomes of the study of spatio-temporal mapping of ecotourism activities.
Peat swamp forest-firesimpacts on local livelihoods: a case study in Kapuas Kahayan Protected Forest Management Unit, Central Kalimantan, Indonesia
Authors: Suwito D , Suratman  , Poejirahajoe E 
Published: March 2020

Abstract
Peat swamp forests have received great global attention in the last few decades because of their carbon stock, which is closely related to climate change and global warming. In addition to the global role of peat swamp forests in climate change and carbon storage, peat swamp forests also have some social and economic functions because of their great contribution to the livelihoods of local people. In Central Kalimantan, peat swamp forests have been experiencing a massive degradation mainly due to fires. This study aims to describe the utilization of peat swamp forests and the impacts of peat-swamp-forest fires on local people’s livelihoods in Central Kalimantan. The research was conducted by interviewing local communities around the area, then the data were analyzed qualitatively. The study result shows that there are 8 utilization activities related to livelihoods by local people on peat swamp forest i.e. logging; gathering rattan, orchid, medicinal plants, grasses and epiphytes, damar, gemor (tree bark); fishing and hunting; freshwater utilization, foods gathering, sacred spots for local belief, and traditional agriculture. Overall, forest fires have significantly negative impacts on local livelihoods as fires cause the loss of biodiversity and decrease the quality of ecosystem services. These losses lead to the disappearance of income and food sources for local people. However, there are also some small advantages or positive impacts of forest fires i.e higher production of fish after forest fires, and more jobs in forest rangers and land rehabilitation from both government and non-government organizations.
An analysis of urban public transportation in Yogyakarta: case of Trans Jogja Bus
Authors: Marwasta D , Handoko R K 
Published: March 2020

Abstract
Transportation is the movement of humans or animals, goods, and information from one location to another. In other words, the action of transport is defined as a particular movement of an organism or thing from a point. Transportation is a derived demand that follow all basic human needs. The more populated of certain area, the more intensively of transportation, and it triggers the transport congestion. Public transportation is one solution to minimize congestion problems due to the large number of private vehicles. This study aims to (1) identify potential users of the Trans Jogja Bus; and (2) analyze the level of Trans Jogja bus occupancy. This study use quantitative research method, i.e. survey method, by using questionnaire instruments for conducting structured interviews and check lists for conducting observations. The mechanism for obtaining data in this study are by collecting primary and secondary data. The location of the research is Yogyakarta City and its surroundings which are covered by Trans Jogja Bus routes. The data was processed with SPSS 19.0 software and analyzed by quantitative descriptive analysis techniques. Results of this research shows that: (1) all of Trans Jogja Bus route actually have potential trip generation, as well as trip destination, however; (2) the occupancy level of Trans Jogja Bus are still little bit low even though service level is quite good.
Vulnerability of economic resilience of slum settlements in the City of Palembang
Authors: Sukmaniar  , Pitoyo A J , Kurniawan A 
Published: March 2020

Abstract
This study aims to look at the economic resilience vulnerability of slums in Palembang City. The method used is a quantitative descriptive of the results of cross tabulation using 382 respondents in each head of household spread in 64 locations of slum areas in the slum city of Palembang . Data collection techniques in this study using survey methods with area proportional random sampling. The results of this study indicate the amount of income is more thanRp. 2,000,000 which reached a percentage of 56% and found significant differences in income levels of more than Rp. 1,500,000 to Rp. 2,000,000 between migrant and non-migrant population. Results vulnerabilities economic resilience of society shows that there are 93,5 % the economic situation equally between income and expenditure so as to have a higher susceptibility to the weak economic resilience families in slum communities in Palembang.
Economic inequality and its impact on human development: insight of Banten Province 2011-2015
Authors: Septianingrum R S , Aditya B , Wijaya A P , Irshabdillah M R , Husna N A , Putri R F 
Published: March 2020

Abstract
Development is a strategy to improve the welfare and quality of life. UNDP concept explained that economic and human development has interrelated relation. Meanwhile, economic development in a region often face inequality and may cause another impact to disparity on human development. This study has the objective to measure and explain the inequality on economic development and understanding its spatial-temporal correlation with human development by the time 2011-2015. The methods that use in this study are Williamson Index (WI), Location Quotient (LQ), Klassen Typology, and Pearson Correlation. The result shows there is inequality on economic development with WI 0.95 in 2011 and decreased in 2015 with WI 0.77. Inequality on economic development influenced by the different economic structure within regencies/municipals. In the context of temporal and spatial data, economic development has a strong correlation with human development in province level and regency level. The government should improve economics, health, and education infrastructure in allregion as an attempt to realize the equality and sustainability development in Banten Province.
Reliability Analysis of Loess Landslide Stability Under Earthquake
Authors: Mu Peng 
Published: March 2020

Abstract
Traditionally, the stability coefficient of the fixed value analysis method is used as the evaluation index of the stability of the loess landslide under the earthquake. This method does not consider the randomness and variability of the calculated parameters, which can not reflect the real stability of the landslide. Based on this reality, this paper establishes the reliability analysis model of loess landslide stability under earthquake, and the model is used to evaluate the seismic stability of a loess landslide.
Research on the Influence of Microwave Filler on the Performance of Recycled Asphalt Mixture
Authors: Zhang Chen , Li Bo , Chen Zhuang , Wang GuoFang 
Published: March 2020

Abstract
In order to study the effect of different microwave fillers on the performance of microwave reclaimed asphalt mixture, carbon black with 10% by volume of asphalt and steel fiber with 6% volume fraction of asphalt were respectively formed by microwave induction method 30%, 40%, 50%. Recycled Asphalt Mixture (RAP) with water-immersed Marshall, uniaxial penetration, four-point bending fatigue for water stability, high temperature stability, fatigue resistance the study. The results show that the asphalt mixture test piece formed by microwave heating has better high temperature stability, water stability, fatigue resistance than the test piece formed by the conventional heating method. the microwave-induced reclaimed asphalt mixture with 40% RAP content has the best high temperature stability. For the performance of high temperature stability, it is better to add steel wool fiber as microwave microwave filler, and the carbon black is used as microwave. Compared with steel fiber, the filler is superior to the water-stable and anti-fatigue of the recycled asphalt mixture under microwave induction.
Catalytic wet oxidation treatment of landfill leachate
Authors: Shi Liang , Zhang Yongli , Lian Siying 
Published: March 2020

Abstract
The landfill leachate was treated by catalytic wet oxidation. The catalysts was prepared by impregnation method, and FSC was used as catalyst carrier. Fe and Co were used as catalyst active components and Ce was used as catalyst auxiliary, and noble metal ruthenium was added to prepare supported multi-component composite catalyst of Fe-Co-Ru-Ce/γ-Al2O3. The water sample pH, decolorization rate, COD removal rate and turbidity removal rate were used as evaluation indexes of catalyst activity. The catalysts were prepared under the conditions of calcination temperature of 450 °C and calcination time of 3 h. Under the same conditions, for the Landfill Leachate, the COD removal rate, decolorization rate, turbidity removal rate of the water samples reached 78.1%, 60.4% and 92.7%, respectively.
Research on Measurement Technology of Residual Stress in Rolling Aluminium Alloys
Authors: Wang Xi 
Published: March 2020

Abstract
In the measurement of textured materials such as Al Alloy sheet, the traditional method of X-ray residual measurement (sin2ψ method) cannot be applied to these materials. In this paper, 2A97 aluminium lithium alloy was used for the study on residual stress measurement of texted materials. The X-ray diffraction method was used to test the orientation distribution function. The elastic constant of the material was calculated theoretically by Ruess model, Voigt model and Neerfeld-Hill model. And the residual stress was calculated. The blind-hole method was used to verify the results. The blind-hole result agreed well with the Neerfeld-Hill model.
Selection and control of green roof materials based on sponge city perspective
Authors: Huang Lijuan , He Xuelian , Tang Xiaohong , Fu Wenfeng , Li Liang 
Published: March 2020

Abstract
This article starts from clarifying the connotation relationship between sponge city construction and green roof, and analyzes the construction plan and the best material selection under the influence of sponge city construction. Then introduces and compares the construction of the green roof under the sponge city background and the materials that can be used at the structural level, the evaluation index system of material selection based on DEA, five kinds of materials of input/output ratio of SBS modified asphalt waterproof coiled material is 0.477, TPO thermoplastic polyolefin waterproofing material is 0.255, PVC waterproof coiled material is 0.335, EPDM waterproofing material is 0.292, and spraying polyurea waterproof coating is 0.245. Comparison and analysis to choose spraying polyurea waterproof coating as the green roof material is more reasonable. This will provide a basis for the design of green roof materials in the context of a sponge city.
Analysis on Reaction Kinetics of High Temperature Corrosion to Metal Heating Surface in Biomass-fired Boiler
Authors: Sun Yu , Wang Yongzheng , Zhu Wenbin , Li Yungang 
Published: March 2020

Abstract
In this paper, the effect on temperature to biomass boiler corrosion is studied by corrosion weight gain experiment, and the thermal analysis model of high temperature corrosion is established by reaction kinetics using experimental results. The corrosion weight gain curve of the heating surface steel is in accordance with the parabola. The thermal analysis kinetics of T91 corrosion process is studied, and the data is matched with several functional models at 480°C to 680°C. The results show that the corrosion reaction is the two-dimensional diffusion type. The reaction kinetic equation was determined and the corrosion process was quantitatively analyzed.