bluuebunny/crossref_metadata_2025_split huggingface dataset:
Study on the effect of fluid-structure coupling on the outlet Piping of reciprocating compressor
Authors: Yuan Wei , Wang Ying , Zhao Jie 
Published: February 2021

Abstract
The fluid-structure coupling has been one of the hot issues of academic research in recent years, the achievements in various fields of study also emerge in an endless stream, but on the current research status, The study of fluid structure interaction in the field of moving equipment, especially compressor, is not very common, With the development of industrial compressor, it is developing towards the direction of large scale and high parameter, Coupling analysis of fluid structure interaction can be used to evaluate the safety and stability of the system, and the evaluations are more close to the actual situation. Therefore, it has gradually been valued. Through the comparison and analysis of the vibration test system of the reciprocating compressor before and after the pipeline inflation, the vibration response caused by the coupling factor is obtained, for the correctness verification of the fluid-structure coupling simulation. the numerical model of the experimental system is established based on ANSYS, and the boundary conditions of the model are simulated by the experimental data, verified the feasibility of simulation program. the experimental and simulation results show that the fluid solid coupling characteristics are not obvious in the vicinity of the reciprocating compressor, and the effect is significant at the top of the buffer tank and the installation position of the orifice plate.
Analysis on the Effective Characteristic of Different Displacement Ways of Tertiary Oil Recovery in the Class II Reservoir of Sazhong Development Zone
Authors: Yu An 
Published: February 2021

Abstract
The first industrial tertiary oil recovery of the class II reservoir in the Sazhong Development Zone was the polymer flooding carried out in Block X at the end of 2002, and achieved noticeable effect. As the class II reservoir blocks were exploited one after another, by combining different geological structures and reservoir characteristics with distribution characteristics of remaining oil, the displacement modes successively went through polymer flooding, strong alkali ASP flooding, weak alkali ASP flooding, and salt-resistant polymer flooding, etc. Considering there are big differences in the geological structure, reservoir characteristics and layer combination of different class II reservoir blocks in the Sazhong Development Zone, and the development effects of different displacement modes are different as well; therefore, it is necessary to learn from the phased results achieved in typical blocks and leading pilot, on this basis, further conduct in-depth comparative study of the characteristics of effective rule and the changes of injection-production parameters of the class II reservoir blocks that have carried out tertiary oil recovery under different displacement modes, provide technical support and selection basis for betting modes up and down of the class II reservoir in the future, and it is of great practical significance to the realization of quality and efficiency improvement and sustainable development of the oilfield.
Problems and Research on Underground Charging Safety of Power Battery for Coal Mine Robot
Authors: Ma Long , Chen Qing 
Published: February 2021

Abstract
In order to further study the underground charging safety of power batteries for coal mine robots, this paper proposes to study the energy transfer mechanism of power batteries in confined space and the difference of energy distribution in flammable and explosive special gas environment. On the basis of theoretical research, the safety performance of the temporary flameproof chamber formed during the underground charging process of the robot is verified by constructing the detection experimental platform of the explosion-proof automatic charging device of the robot, so as to solve the problem of potential safety hazard assessment caused by exposed contacts or unreliable docking during the underground charging process of the coal mine robot, and provide theoretical and experimental basis for the underground charging safety.
Quantitative Evaluation Method and Application of Airflow Stability of Mine Ventilation System
Authors: Li Bingrui , Wang Wei , Li Peng , Chen Junkui , An Linghe 
Published: February 2021

Abstract
A quantitative analysis method is proposed for airflow stability evaluation of complex ventilation networks. The influences of resistance change on airflow and its variation laws are analyzed by mathematical statistics method based on the simulation of airflow state in ventilation network. It is proposed that the airflow change rate is used as the quantitative evaluation index of airflow stability, and the sensitivity branches and dominant branches of ventilation system are determined by the airflow change rate matrix. A set of airflow direction discriminants of complex network is derived based on the deep analysis of the correlation among resistance, airflow and airflow change rate of branches. The results show that the stability quantitative analysis results and airflow direction discrimination results of this method are consistent with the results of computer simulation of airflow state, and the airflow direction discriminants can be applied to any complex network.
Research on Resource Utilization of Municipal Solid Waste Landfill
Authors: Ma Jun , Gao Tao , Hu Lidan 
Published: February 2021

Abstract
Due to the advantages of simple landfill treatment process and low treatment cost, it is widely used at home and abroad. At present, many large cities are surrounded by landfills, which severely hinders urban development. This article starts from the existing problems of municipal waste landfills and discusses the realization of municipal waste landfill disposal and resource utilization.
The application of high-pressure rotary jet grouting curtain on the ocean engineering structure
Authors: Liu Wenbin 
Published: February 2021

Abstract
The high-pressure rotary jet grouting curtain is a common water-proof structure in civil engineering. This paper analysed the application of high-pressure rotary jet grouting curtain in ocean engineering based on construction of the western man-made island of the Shenzhen-Zhongshan Channel project, modelling the pile forming, shearing strength, and water proofing effect, and emphasizes the key points in the construction.
Characteristics and farmer’s response to climate variability to support sustainable agriculture: case study in Tasikmalaya, West Java
Authors: Estiningtyas W , Suciantini  , Dermoredjo S K 
Published: February 2021

Abstract
Rice farming is strongly influenced by climate conditions. The availability of water from rainfall is a major consideration for farmers when determining the start of planting, while the beginning rainfall will change due to extreme climate events. The impact of climate variability as floods, droughts and attacks from pests and diseases brings losses for farmers in their food farming. The purpose of this paper is to identify the characteristics and responses of farmers to climate variability for the sustainability of food farming. Farming system in Singaparna sub-district is mostly carried out by farmers who are over 60 years old with primary school education and land ownership < 0.5 ha. Climate variability has an impact in a shift in the beginning of the rainy and dry season. Climate variability has an impact in the form of a shift in the beginning of the rainy season and the beginning of the dry season. The area of land affected by seasonal shifts is a significant factor affecting production. Farmers’ characteristics and responses can be used as a basis for increasing the adaptive capacity of farmers to minimize risks to the impacts of variability and climate change.
Effect of various drying methods on the physical characteristics of arrowroot powder
Authors: Indrasari Y P , Karyadi J N W , Nugraheni N F , Tarwaca S N , Albyan R , Setiyadi I , Ayuni D 
Published: February 2021

Abstract
Arrowroot (Maranta arundinacea) is a large herb found in rainforest habitats. In Indonesia, Arrowroot (or known locally as Ubi garut) is usually processed into a powder ingredient for many foods such as puddings and cookies. One of the crucial processes in producing arrowroot powder is drying. In this study, the effect of various drying methods on the characteristics of arrowroot powder was evaluated. They were solar drying (SD), cabinet drying (CD), and pneumatic drying (PD). The pneumatic dryer used was self-made with a total dimension of 1600×500×2500 mm. It was made from stainless steel plate with 3 mm thickness and equipped with heater, blower, feeder, cyclone, and drying chamber (heater fins of 4,500 watts). The moisture content showed that the CD sample has the lowest moisture content than other methods. The PD has a great potential to be used to produce arrowroot powder while retaining its color and nutritive values.
Estimating of soil moisture using shetran model at Cisanggarung catchment area
Authors: Suroso  , Wahyuni R P , Ardiansyah  
Published: February 2021

Abstract
Soil moisture is one of the essential controls for the hydro-climatology processes. Soil moisture value can be used as an indicator of soil fertility so that it has a vital role in increasing agricultural and plantation production. Understanding the soil moisture variability on a spatial-temporal scale is very interesting in many practical applications such as drought prediction and agricultural modelling. The purpose of this study was to estimate the soil moisture value which distributed in space and time in the Cisanggarung River Basin with the spatial resolution of 500 m × 500 m and daily temporal resolution. The Shetran physical-based hydrological model was applied by utilizing hydro-climatological data derived from the remote sensing measurements from 2001 to 2017. The Shetran model input data consisted of the digital elevation model, land use land cover, TRMM rainfall data, evaporation data, and soil properties data. The results of this study indicate that Shetran hydrological model is reliable to estimate soil moisture in a watershed. This soil moisture values are then validated with the historical data of drought disaster.
Trend analysis of extreme precipitation indices in the southern part of Java
Authors: Abdila W P , Nugroho B D A 
Published: February 2021

AbstractGlobal warming causes changing on climate system which driving extreme climate and metrological event. The occurrence of extreme event, such as extreme precipitation can lead to flooding and drought which can have an impact on agriculture production. To observe the extreme event, Expert Team for Climate Change Detection Indices (ETCCDI) developed 27 extreme indices which are 11 extreme precipitation indices and 16 extreme temperature indices. In this study, we analyze the trend of extreme precipitation indices to understand the changing of precipitation in Southern part of Java. Extreme precipitation indices were analyzed using Climpact2. Trend significance of extreme indices time series were calculated using non-parametric Mann-Kendall Test. Spatial distribution of the annual trend in each index illustrated using IDW interpolation. Most of significant trend in extreme precipitation indices occurred in North West station of study area. Negative significant trend only happened on consecutive wet days (CWD) index that means wet days was decrease. Positive significant trend happened in every index exclude consecutive dry days (CDD), Number of heavy precipitation days number of heavy precipitation days (R10mm), and PRCPTOT. Precipitation in study area occur with high intensity in short period.
Physical characteristic of instanised chocolate beverage powder produced with palm sugar and sucrose as sweeteners
Authors: Setiadi P A , Saputro A D , Nurkholisa Z , Hardiyanto Y F , Bintoro N , Karyadi J N W 
Published: February 2021

Abstract
Cold cocoa beverage is one of the derivative products of cacao. It has sweet taste and refreshing sensation which is popular in tropical countries. Sweetener is added mainly to reduce the bitterness of the cocoa powder. Normally, before adding ice cube, hot water is used to dissolve cocoa drink powder. Nevertheless, this method is not efficient. Therefore, a method that can produce cocoa drink powder which can be easily dissolved is required. This study aimed to investigate the impact of palm sugar: sucrose (P:S) proportion and drying duration on the characteristics of cocoa drink powder made using continuous-type steam jet agglomerator. The result showed that the solubility, bulk and tapped density increased as the proportion of palm sugar and drying duration increased. However, the lightness tended to be comparable and moisture content after drying process decreased as the proportion of palm sugar increased.
The hardness analysis of noodles made from modified cassava flour, spirulina (Spirulina platensis) and basil leaves extract (Ocimum sanctum L.)
Authors: Al-Baarri A N , Widayat  , Aulia R , Prahasiwi E K , Mawarid A A , Pangestika W , Lestari F P 
Published: February 2021

Abstract
The alternative solution for high import costs of wheat flour is by substituting wheat flour with mocaf (modified cassava flour). Mocaf is a modification of cassava flour made by fermentation treatment using lactic acid bacteria, acetic acid or enzymes. However, mocaf has a low gluten and protein content so it might produce noodle products with a poor texture. Therefore, it is necessary to add other ingredients in order to increase protein content and change the appearance, one of which is fortification with spirulina. Spirulina has a natural aroma like the smell of fresh seaweed with a slightly fishy aroma that comes from the high protein content. Hence, it is necessary to add basil leaf extract which can give a distinctive smell of basil to overcome the fishy aroma of the noodles. This research was conducted to determine the texture of modified noodles from mocaf with the addition of spirulina and basil leaf extract using a texture analyzer. Based on the research conducted, it was found that the addition of basil and spirulina leaf extracts could affect the texture of mocaf noodles to become more chewy, dense and not easily broken.
Optimization of simple sugar extraction of nagara bean (Vigna unguiculata ssp. Cylindrica) on concentration and proportion of ethanol
Authors: Susi S , Udiantoro  , Gendrosari S 
Published: February 2021

Abstract
Nagara bean, the native bean of South Kalimantan, is not only contains carbohydrates and protein, but also contains oligosaccharide fractions such as raffinose and stachiose that can cause flatulence. Raffinosa Family Oligosacharide (RFO) is an undigested carbohydrate that is naturally found in beans. The presence of the oligosaccharide fraction can be identified through reducing sugar and total sugar content in nagara bean. The yield of this fraction depends on the type of material and extraction method, such as the type of solvent, solvent concentration, contact time and extraction temperature. This study was aimed to optimize the extraction of simple sugar fractions on nagara bean at several concentrations of ethanol with various ratio of nagara bean flour to ethanol using the Response Surface Methods (RSM). Optimization was carried out at the center point ethanol concentration of 50% and the ratio of nagara bean flour and ethanol of 1: 10. The optimization results of the simple sugar fraction extraction process in nagara bean flour were obtained at a concentration of 30% ethanol and a ratio of ethanol to nagara bean flour of 10: 1 at extraction conditions at 50° C and extraction time of 30 minutes.
Endophytic bacteria: an emerging tool for biological control bacterial leaf blight of paddy
Authors: Prihatiningsih N , Djatmiko H A , Lestari P 
Published: February 2021

Abstract
Endophytic bacteria were isolated from the root of paddy, not negative influence even could serve as plant growth promoter and pathogen biocontrol likely Xanthomonas oryzae pv. oryzae caused of bacterial leaf blight. The research was aimed to know the effectivity of controlling the endophytic bacteria against bacterial leaf blight of paddy. Methods of this research were suppressing effect to control bacterial leaf blight with seed dipping and soaking the endophytic bacterial suspension on surrounding plant in the polybag. Nine bacterial and one control were treatment in this assay and three replicates, arranged with randomize completely block design. Endophytic bacteria isolated from roots of paddy were evaluated for their capacity to suppress bacterial leaf blight intensity, infection rate and the effectivity control. The result showed that the endophytic bacteria could suppress the disease, and the isolate of SB1 (from Sumbang 1) is the best for antagonistic effect by 64.16% and 49.14% effectivity at screen house and paddy fields respectively. Infection rate of this disease was slow by 0.024 unit.day−1 and different with the control was 0.088 unit.day−1.
Seed treatment to improve seedling establishment in the anaerobic conditions
Authors: Wahyuni S , Agustiani N , Salma S , Widiastuti M L 
Published: February 2021

Abstract
Limited farm labor in swampy area encourage farmers to apply direct seeding method, however land conditions with excess water caused un-germinated seeds. The purpose of this research was to obtain seed treatments to increase seedling establishment in anaerobic germination conditions. The first experiment was laboratory trial arranged in a factorial design with two factors namely seed treatments and rice varieties. A total of 32 treatments along with control were tested on three rice varieties: Inpara 9 (swampy variety), IR 42 (AG-susceptible), and KHO (Anaerobic Germination/AG tolerant). The results showed that treated seeds show faster germination and has higher germination index. The second experiment was greenhouse trial to confirm the effectiveness of 12 best seed treatments from the first experiment. Water managements were conducted in anaerobic and aerobic conditions. Seeds on anaerobic conditions decreased seedling establishment, shoot length, root length, shoot dry weight, and root dry weight for 44.6, 28.1, 34.4, 80.7, and 74.2%, respectively. KHO showed better performance in anaerobic conditions. Treated seeds had better seedling establishment and seed growth in anaerobic conditions, except for hardening Trichoderma treatment. The best three seed treatments in anaerobic conditions were hardening H2O, thermo treatment 80°C+NaOCl, and hardening ascorbic acid.
Prediction of surface runoff and erosion rate using SWAT (soil water assesment tool) model in Selopamioro catchment as directions of soil and water conservation
Authors: Habib H , Ngadisih  , Tirtalistyani R , Susanto S , Nurudin M 
Published: February 2021

Abstract
Selopamioro catchment part of Oyo Watershed, is located in downstream area of Selopamioro village which consist of steep slope gradient, and has been constantly exposed to intensive farming activities. Thus, this watershed is susceptible to erosion. One of models to predict the impact of land use on hydrological and sedimentary conditions is SWAT (Soil Water Assessment Tool). Therefore, the purpose of this research was to apply the SWAT model in predicting surface runoff and erosion. The result of this study will be used as initial analysis to support the direction of soil and water conservation. Topography, land use, and climate data were collected to simulate erosion and surface runoff. Two adjacent sub-catchments namely DTA 1 and DTA 2 were analyzed. Surface runoff in DTA 1 is 333,660,000 liters/year and in DTA 2 is 316,920,000 liter/year. The erosion rate in DTA 1 is 24.6 mm/year and in DTA 2 is 21 mm/year. The result of SWAT model tends to be overestimate. This shows that SWAT model might not suitable to be used for erosion prediction in tropical agriculture country, such as Indonesia. Updates of SWAT data for physical characteristic in tropical country might need to be carried out for reliable result.
The role of pre-treatment in enhancing yield and antioxidant activity of lemongrass (Cymbopogun citratus) essential oil
Authors: Erminawati  , Naufalin R , Sidik W , Rahman F A 
Published: February 2021

Abstract
Sample preparation before distillation is an important step in producing high yield and good quality of lemongrass (Cymbopogun sitratus) essential oil. In order to improve the production process and to provide information as reference for further practical applications, the effects of sample pre-treatment (with and without microwave heating) and distillation time (3, 4, and 5 h) were studied. In addition, the samples types (dried stem and dried leaf) were compared. Results of the study suggested that the highest antioxidant activity of lemongrass essential oil (86.33%) was obtained from lemongrass dried stem that were heated in microwave and distilled for 4 h with yield of 2.307%. While the highest yield of lemongrass essential oil produced (2.63%) was obtained from lemongrass dried stem that were heated in microwave and distilled for 5 h with antioxidant activity of 69.67%. Based on the results, it can be concluded that lemongrass stem contains higher essential oil compare to that of the leaf and microwave heating before distillation gave higher yield and better quality of the product.
The “PATBO SUPER” technology innovation to increase rice production in rainfed rice fields
Authors: Sari R , Sutrisna N , Surdianto Y , Liferdi  
Published: February 2021

Abstract
SUPER PATBO technology is adoption from IPAT-BO technology with some enhancements to make it suitable for rainfed areas. It has been adapted in several locations. There are five main components of PATBO SUPER technology, namely: (1) New Superior Varieties of the amphibian group; (2) Water management at the macro and micro levels; (3) The use of in situ organic matter and biological fertilizers; (4) An effective and efficient weed control; and (5) Agricultural machinery application. The results of the several studies show that the PATBO SUPER technology has a good performance in several locations, namely in Ujungjaya District, Sumedang District and Palasah District, Majalengka Regency. Rice productivity in Ujungjaya Subdistrict increased by 33.51%, from 5.64 t/ha with the technology commonly applied by farmers to 7.53 t/ha with SUPER PATBO technology. In Palasah District, Majalengka Regency, it can increase rice productivity by 20%, from 5.70 t/ha to 6.84 t/ha. The application of PATBO SUPER technology is also financially profitable as indicated by a BC Ratio of 1.49 and an MBCR of 14.18. The dissemination of PATBO SUPER technology can be accelerated by establishing a field laboratory in each development target area.
The nutritional value of agricultural waste forages fed to ruminants from agroecosystem in Grobogan Regency
Authors: Prasetyo A , Suhendrata T 
Published: February 2021

Abstract
This study examines the nutritional composition of tropical agricultural waste forage fed to cattle, sheep, and goats (ruminants). The explanation for the variation in nutrients between forages depends on soil fertility and water adequacy in upland agroecosystems. Agricultural waste ingredients for ruminant livestock feed come from rice straw, corn, soybeans, and the carrying capacity of these feeds. Agricultural waste feed ingredients are arranged in a complete feed formula. The nutritive value of complete feed includes crude protein, crude fiber, crude fat, energy, and ash. The aim of this study is to make complete feed of ruminants as animal feed for cost efficiency and feed stock in the dry season.