bluuebunny/crossref_metadata_2025_split huggingface dataset:
Study of design discharge and river capacity in Celeng Sub-watershed, Special Region of Yogyakarta
Authors: Abadi A W , Astuti B I D , Kurniasari  , Siahaan Y V O , Jamil U A , Widyaningrum W , Jatti A P , Putri N H , Astabella R D , Pratiwi C B I , Ayumi N , Hayat D M , Putra J H , Putri R F 
Published: March 2020

AbstractCeleng sub-watershed is a catchment area located in the Oyo watershed. This catchment has circular shape which is situated in the alluvial plain. In the 2018, there was a huge flood occurred in the area that was triggered by Savana Cyclone. The cyclone itself contributed in extreme precipitation, resulted in high discharge in a very short time, and spilled over the riverbank. The research aims (1) to analyze the discharge capacity in the Celeng sub-watershed, (2) to determine the design discharge of Celeng sub-watershed for 2, 5, 10, and 25 years return period, and (3) to evaluate whether the design discharge excess the Celeng river capacity or not. The research uses quantitative analysis through rational method and slope area method. The design discharge measured by rational method and applied to evaluate the river capacity along with rational method. The result shows that the area does not experience flood in all return period.
Nutrien flux in the Bompon Watershed, Magelang, Central Java, Indonesia
Authors: Wijayanti N F , Delweis B A , Christanto N , Haryono E 
Published: March 2020

Abstract
In several places, agriculture area is the main contributor of Nitrogen and Phosphate existence in water. This research conducted in Bompon Watershed which has agriculture area 90% of the total area. This study aims to measure the amount of Nitrogen and Phosphate losses during May 2018 – May 2019. The calculation of Nitrogen loss is conducted through field sampling, and load calculation. In the period without measurement, daily load were estimated by interpolation between L and Q relation. The result of this research shows that the most dominant amount of nutrient pollution in Bompon watershed are Nitrate and Phosphate with the number reach 6.5 kh NO3-N/day or 1,084 kg NO3-N/month and 103 kg P/day or 883 kg P/month.
Relationship between extreme rainfall based on GSMaP data with Madden Julian Oscillation (MJO) in Bangka Island
Authors: Fadholi A , Nurjani E , Suprayogi S , Adzani R 
Published: March 2020

Abstract
The effect of MJO events on extreme rainfall events on Bangka Island needs to be spatially studied in more detail. The low quality of rain station data encourages the use of alternative data such as Global Satellite Mapping of Precipitation (GSMaP). This study aimed to analyze the influence of active MJO on extreme rainfall events using GSMaP data on Bangka Island. The methods used are extreme threshold of 95th, 98th and 99th percentile, the Spearman Rank correlation between extreme rainfall events and active MJO and its correlation significance test. The results showed that northern coast has the highest range of extreme threshold. The correlation significance test showed GSMaP grids that have a significant correlation with the MJO are in the north of the Island, especially coast area. MJO phases 3 and 5 have an impact on decreasing of extreme rainfall events which are known through the negative correlation values. From all the three extreme thresholds, it was only MJO phase 4 that increasing extreme rainfall events. Active MJO phase 4 causes Bangka Island as a convective area, while MJO phases 3 and 5 affect the formation of suppressed areas on Bangka Island.
Water management model in Bodri River Basin, Province of Central Java
Authors: Purnama I L S 
Published: March 2020

Abstract
Basically, in the tropics there are three sources of water, namely rainwater, surface water (river and lake water), and groundwater. From the existing water sources, almost all human daily water needs, such as drinking, bathing and washing, are sourced from groundwater. Uncontrolled extraction of groundwater can cause a variety of consequences on the environment, such as groundwater degradation, seawater intrusion and even land subsidence. Groundwater management efforts need to be carried out so that availability is maintained. The first step in this effort is to formulate a management model as a basis for determining policy. For this reason a dynamic modeling simulation is carried out using the Powersim 2,5c Program. The results showed that the priority of groundwater management efforts in the Bodri River Basin was to reduce groundwater use for the domestic sector which could be done through reducing the rate of population growth and saving groundwater use. Another result of this study is that the recharge of groundwater in the Bodri River Basin is relatively low, so efforts to find alternative sources of water other than groundwater need to be considered.
Visibility Estimation Due To Forest Fire Smoke Using Backward Elimination Multiple Regression of Himawari_8 Satellite Data over Sumatera and Borneo Island Indonesia
Authors: Ismanto H , Hartono H , Marfai M A 
Published: March 2020

Abstract
Land and forest fires smoke has been regularly revealed over Sumatera and Borneo Islands for past two decades. Various sector have been severely impacted, including air transportation. Air obscurity caused by smoke reduce horizontal visibility and profoundly affects aviation regularity, efficiency and safety. The study aimed to develop a visibility estimation of an orbital satellite using remote sensing and observation data. Orbital satellite is one of the technological advances that have potentials for supporting and improving the ability of meteorological service provider to meet user’s needs related to adverse weather. The Automatic smoke detection using classification tree analysis was used as the first step. Then backward elimination for multiple regression was used to produce visibility estimation based on Himawari_8 satellite-smoke-detection and actual observation of visibility in airports. The results showed that the correlation between the estimated visibility in satellite-detected smoke and observed visibility was high (R2=0.68). This approach very sensitive to thick smoke with horizontal visibility of shorter than 2000 meters.
Evaluation of soil characteristics and infiltration capacity under Dimocarpus Longan Fruit-tree based agroforestry in Selopamioro, Imogiri, Bantul, D.I.Yogyakarta
Authors: Sagung Esya Maharani A A , Ngadisih  , Tirtalistyani R , Mawardi M , Alviandy D , Rahmadi N A 
Published: March 2020

Abstract
Selopamioro village in Imogiri sub district, Bantul-D.I. Yogyakarta is located along southern mountains of Java. Nowadays, this village is developing agro-ecotourism through fruit-tree based agroforestry for improving household economy while keeping environment of hilly areas. The main objective of this study was to explore and evaluate physical characteristic of soil and infiltration capacity under Dimocarpus longan fruit-tree based agroforestry in Selopamioro village. Total area of Dimocarpus longan fruit-tree based agroforestry is 0,48 hectare with total 52 trees. The soil characteristics were focused on bulk density (ρb), particle density (ρs), porosity, textures, structure, soil moisture, content of organic material (COM), and lime content. The empirical models of infiltration, Kostiakov, was adopted to define soil infiltration capacity. The measurement of infiltration rate in the field was carried out by using Double-ring Infiltrometer method. The soil sampling and infiltration measurement were conducted in three different characteristics of slope, i.e., upper, middle, and lower slopes. The soils were taken from three points and two depth (0-40 cm and > 40 cm) per slope category, whereas the infiltration test was conducted solely in each points of slopes. A regression and correlations method were applied to evaluate the soil characteristics and infiltration capacity. The slope of upper, middle, and lower in Dimocarpus longan land were 30°, 17°, and 39° respectively. The Dimocarpus longan fruit-tree based agroforestry in middle slope was mixed with rainfed rice, the lower was nuts, while the upper slope was dominated by weeds. The soil was characterized as clay, sub angular blocky structure, bulk density (ρb) 1,26-1,46 gr/cm3, particle density (ρs) 2,04-2,10 gr/cm3, porosity 28-40%, soil moisture 36,90-42,00%mass, COM 1,16-1,78%, and lime content 2,69-3,46%. The average of infiltration capacity was 265,10 mm/hours which classified as very fast categories. The strongest relation between physical characteristic of soil and the infiltration capacity was owned by the soil textures. It had correlation coefficient -0,621, while the water content 0,883.
The comparison of rainfall intensity analysis methods in upstream area of Belik Watershed, Yogyakarta
Authors: Munawaroh N , Puspitasari N N A , Hadi M P , Suarma U 
Published: March 2020

Abstract
Belik Watershed is one of a catchment which located in urbanized area of Yogyakarta. The upper stream part of this watershed have very important role as recharge area. However, vast land conversion occurrence in Sleman Regency threatened its function and cause several inundation case within the area. In other words, stream capacity unable to accommodate the surface runoff. This research intend to analyzed rainfall return period and compare rainfall intensity analysis methods to be implement in the research area. Furthermore, statistical analysis performed to carry out suitable method in the previous research aims. The comparison of rainfall intensity analysis in the short time series distance utilizes Talbot Method and Sherman Method. Rainfall data of short times series distance obtained from Automatic Water Rainfall (ARR). This Calculations of the standard deviatiornesearch analyse 2, 5, 10, 25 and 50 years of return period. Calculations of the standard deviation and error square mean root peak-weight (PWRMSE) determine to choose which method has a better result. The design of rainfall intensity result shown in the Intensity-Duration-Frequency (IDF) graph. Based on the calculation, the most appropriate method is the Sherman Method with standard deviation and PWRMSE for each return period in chronological order of 2 years (-0.27) (Z 3.52); 5 years (-0.67) (Z 3.83); 10 years (0.3) (Z 5.39); 25 years (0.6) (Z 7.56); and 50 years (-1.0) (Z 9.72).
Low amplitude of streambank erosion: distinguishing mass and surface fluvial erosions
Authors: Sutarto T E , Papanicolaou A N T , Wilson C G 
Published: March 2020

Abstract
The purposes of this manuscript are in two folds e.g.: first, to promote two novel techniques using field-laboratory protocols, each for quantifying surface and mass fluvial erosion, second, to capture and highlight the regime change in the mode of bank erosion from surface to mass fluvial erosion based on real monitoring and measurements on a streambank face. In this study, conduit erosion flume and Photo Electronic Erosion Pin (PEEP) sensor technique were used for monitoring and measuring surface and mass fluvial erosions, respectively. Using those techniques the τ

c,sf
and τ

c,mf
, two key parameters which determine the onset of surface and mass fluvial erosion, can be determined successfully. The PEEP sensor can measure the mass fluvial erosion occurred under water, even capture the quasi-continues nature of erosion. More importantly, using these two methods, the presence of two regimes in the low amplitude of bank erosion, e.g. surface fluvial erosion and mass fluvial erosion can be captured. Starting from low to high shear stress, the onset of surface fluvial erosion as well as the transition from surface to mass fluvial erosion can be depicted.
Urban response towards tropical cyclone using twitter in Indonesia
Authors: Widyanarko U , Hizbaron D R 
Published: March 2020

Abstract
Tropical Cyclone Cempaka struck the southern coast of Java Island in November in 2017, causing floods and landslides in Yogyakarta, Wonogiri, Pacitan, Ponorogo, and the surrounding areas. These disasters devastated urban and rural areas and disrupted community livelihoods as they disconnected inter-city road access, flooded agricultural land, and damaged public facilities. During these hazardous events, many people actively left a “trace” on social media, especially Twitter. This research was designed to describe urban respond using Twitter during Tropical Cyclone Cempaka (TCC). The research data sources were tweets filtered with five keywords with geotagging. After the preprocessing stage, a total of 457 tweets were categorized as “urban” and “rural”. Then, the content was analyzed qualitatively by identifying the most frequently appearing words, the number of response (like, reply, and retweet), and the accounts mentioned on the tweets. The results showed that urban response to these catastrophic events was positive by posting words of prayer and sympathy, disseminating information for raising awareness of disasters, and organizing fundraising for the victims. Turned out that those able to respond was not mainly urban dwellers, there were many responds which based at rural areas. It was marked by similar words that mostly appeared in two comparative areas.
The Availability of Social Space in The Urban Yogyakarta, The Case Study of Umbulharjo District
Authors: Widiyastuti D , Ermawati H 
Published: March 2020

Abstract
Social interaction for the elders is one of the important activities as self-actualization in the community which can be done by involving themselves in various activities in the neighbourhood. The phenomenon of increasing elderly living in urban areas requires cities to be able to provide an environment which accommodates the physical limitations of the elderly. Yogyakarta City, which has an elderly population of 12.87% of its total, needed to provide comfortable facilities for the elderly as an effort to improve their quality of life. This study aimed to describe the elders’ social activities in Yogyakarta City and identify the facilities provided by the government to meet the needs of elderly activities. This study used primary data obtained through structured interview to the elderly and field observation. The results showed that most of the elderly’s social activities in Yogyakarta were carried out near their homes due to physical limitations. Most of the locations are public places within the housing area provided by the government such as the local citizen hall and public open space. The Yogyakarta city government needs to improve infrastructure to facilitate the elders’ activities, especially in certain area like river bank.
Development of Smelting Reduction Ironmaking Process
Authors: Zhou Xiaolei , Pu Song , Liu Ningbin 
Published: March 2020

Abstract
The production practice of COREX 3000 shows that COREX is a new type of ironmaking production method that has become mature in recent years. While achieving good environmental and social benefits, it also faces many problems. Production found that COREX 3000 has a high fuel cost and high production costs. Coal injection through the tuyere can effectively use the pulverized coal generated during transportation, reduce production costs, and obtain better economic benefits. During the COREX coal injection process, pulverized coal passes through the tuyere of the melter and gasifier and enters the swirling zone for combustion. Generate hot gas to meet the needs of metallurgical reactions. Unburned pulverized coal moves up, participates in metallurgical reactions, or stays somewhere. This has a certain effect on the melting gasifier.
Simulation Design of 30KHz Ultrasonic Rolling Tool Head
Authors: Yu Zexu , Song Jinchun , Wang Wenqiang 
Published: March 2020

Abstract
In order to explore the types of ultrasonic rolling tool head used in ultrasonic rolling and finishing processing device, ANSYS Workbench is taken as a tool to simulate the machining process of ultrasonic rolling processing through transient dynamic analysis, and the maximum residual stress distribution and stress concentration of 45 steel workpiece are analyzed. Based on the simulation result, the ball-type ultrasonic rolling tool head is selected in this work. In addition, the transient dynamics module of ANSYS Workbench is also used to simulate the ultrasonic rolling tool head of different structure parameter, in that way, the accurate and reasonable structure parameters of rolling components of ultrasonic rolling tool head can be achieved. The results of this work show that a ball-type ultrasonic rolling tool head of a diameter of 8mm can make the maximum residual stress minimum and stress concentration slightest under the condition of normal processing of the 45 steel workpiece. In other words, it suggests that this ultrasonic rolling tool head can produce the best surface quality of 45 steel workpiece.
Preparation of Antibacterial and Deodorizing composite regenerated cellulose fibers based on natural functional agents
Authors: Lv Cundong , Qiu Chunli , Yu Husheng 
Published: March 2020

Abstract
The regenerated cellulose fibers with antimicrobial and deodorizing functions were prepared by wet spinning process by blending the extract of Artemisia argyi and activated clay powder into the spinning solution. The mechanical properties and antimicrobial and deodorizing functions were tested. The results show that the breaking strength and breaking elongation rate of the composite fibers are slightly lower than those of ordinary cellulose fibers. The inhibition rate of Staphylococcus aureus, Escherichia coli and Candida albicans were 95%, 81% and 83% respectively, and the reduction rates of ammonia, acetic acid and isovaleric acid were 80%, 95% and 78%, respectively. It has excellent antimicrobial and deodorizing performance.
Liquid Exfoliation Process Optimization of Graphene-Like Molybdenum Disulfide with Orthogonal Experiment Method
Authors: Zhang Tianyun , Wang Haiqing , Zheng Xiaoping , Chen Kui 
Published: March 2020

Abstract
The values of process parameters have direct effect on the concentration and thickness of graphene-like molybdenum disulfide (MoS2) in dispersions during liquid exfoliation. For the purpose of optimization liquid exfoliation process of MoS2 and obtaining dispersions with concentration of MoS2 as high as possible, orthogonal experiment of 3 factors at 4 levels was determined by taking absorbance of absorption peak (located at 620 nm nearby) of graphene-like MoS2 in UV-Vis spectra as criteria for decision-making of quality. The results were further analyzed with range analysis method. The results indicate that, within given test range, the process parameters affecting absorbance, i.e. concentration of graphene-like MoS2, from high to low are 1,4-butanediol (BDO) content in BDO/water mixture, ultrasonic power and ultrasonic time, and the optimal process parameters of liquid exfoliation are BDO content being 80 vol%, ultrasonic power being 600 W and ultrasonic time being 40 h, which is further verified by additional test.
Experimental Study on Dairy waste water treatment by Photosynthetic bacteria
Authors: Wang Shuai , Yao Changhao , Jia Lianying , Yang Yang 
Published: March 2020

Abstract
Compared with the results of experiments,the effect of PSB on dairy waste water treatment and influencing factors were studied.The experimental results show that the removal efficiency of COD and BOD5 in dairy wastewater by PSB is much higher than the traditional methods.Under the anaerobic acidification-semi micro oxygen and semi-darkness conditions,the removal efficiency of COD is better than that under anaerobic light-illumination and aerobic darkness conditions. The optimal conditions are that the temperature is controlled between 15°C and 30°C,and the value of pH is 6.5-8.5, and the volume ration of wastewater and bacterial liquid is at 3:1,and DO in system is about 0.1-0.8mg/L.The stable water quality and higher removal efficiency of COD and BOD5 provide the basis for the further treatment of high concentration organic wastwater.
A Study on the Application of Natural Antioxidant Lignan in Boiled and Smoked and Boiled Sausages
Authors: Gao Qianqian , Wang Yingchen , Kuang Ming , Zhang Wenying 
Published: March 2020

Abstract
With fresh carp meat and black fungus as the main raw materials, black fungus and pork sausages with fish flavor and rich nutrition were made through reasonable processing based on the optimal process formula; the color, fat oxidation, odor, and rancidity of the product during storage were investigated after adding different amounts of natural antioxidant lignan; and the comparison with the blank control and analysis were carried out. The results show that the addition of 0.075% lignan had the best antioxidant effect. The TBA value and acid value of lignan-added sausages were significantly lower than those without lignan.
Transient numerical simulation on the surface deformation for GAE forming of plastic micro-pipe
Authors: Ren Zhong 
Published: March 2020

Abstract
To ascertain the mechanism of gas-assisted extrusion (GAE) deformation for the plastic micro-pipe (PMP), the transient simulation was done. The geometric model based on three phase fluids and finite element mesh were established. To get the converge solutions, the Crank-Nicolson integration, the interpolation method of elastic-viscous split-stress finite element method combined with streamline-upwind scheme were used. At the reasonable boundary and material conditions, the GAE forming of PMP for different gases flow rates were numerically studied. Moreover, the extrusion profiles of PMP under different transient times were also obtained. To explain the reason of surface deformation for the GAE forming of PMP, the radial and axial velocity, and stress difference of melt under larger gases flow rates at different transient times were all obtained. The transient numerical results can better interpret the mechanism of surface deformation of PMP.
Preparation of environmentally friendly chitooligosaccharide via enzymatic hydrolysis using response surface methodology
Authors: Xu Song , Xu Feng , Ma Yuqin , Rong Haiwu , Chen Xin 
Published: March 2020

Abstract
In this paper, chitooligosaccharide was prepared via the enzymatic hydrolysis of papain with chitosan as a raw material. The effects of pH, reaction time, temperature, and mass ratio of chitosan and enzyme on the product yield were analyzed. Single-factor and orthogonal experiments were used to determine the main factors affecting the reaction, and response surface methodology was used to optimize chitooligosaccharide preparation conditions. Optimum conditions were achieved at pH 4.50, with an enzymolysis time of 77.4 min, an enzymolysis temperature of 45 °C, a substrate concentration of 1.75% and an enzyme to chitosan weight ratio of 8.85. Under these conditions, the chitooligosaccharide yield reached 37.78%.
Experiments on loading capability of Inclined Suction Foundation
Authors: Huang Yiren , Ma Shili , Xie Liquan , Huang Wencai 
Published: March 2020

Abstract
Suction foundation, as a new type of marine anchoring foundation, has the advantages of reuse, fast construction, and large vertical bearing capacity. In this paper, through a self-developed bearing capacity test device, a series of load-bearing performance tests of the suction foundation are performed to reproduce the bearing characteristics of the suction foundation under the action of the pull-up load. It can be found that bearing capacity of suction foundation increases with the penetration, and the influence of the inclination angle on the bearing capacity of the suction foundation is in a middle value range.