bluuebunny/crossref_metadata_2025_split huggingface dataset:
Experimental Study of Condensate Vaporization into Bubbles under Different Operating Parameters
Authors: Wang Ce , Lü Yu-ling , Song Chao , Feng Qing-wei , Chen Xiao-xuan , He Li-min 
Published: October 2023

Abstract
Produced water (PW) is a natural by-product of the oil and gas production process, where crude oil is dispersed in the form of micron-sized emulsified droplets in the produced water due to mixing between crude oil and water caused by equipment, piping and valve shear action. Flotation is the main method for treating emulsified oil droplets in oilfield produced water. The conventional flotation technology suffers from a series of problems such as large reflux ratio and poor flotation effect, thus limiting its further application. In this paper, bubbles are prepared by vaporization of low boiling point condensate through theoretical analysis and experimental study. In this paper, the law of bubble generation from condensate solution at different temperatures after decompression and release is investigated. The results demonstrate that the median particle size of gas bubbles generated from condensate is related to the condensate content, mixing pressure, release pressure, and temperature. The median particle size can reach 9.65 μm when mixed at 2.0% condensate content, 0.2 MPa mixing pressure, and 35°C, and released at atmospheric pressure, which is much smaller than the size of gas bubbles generated by dissolved air flotation. The condensate bubbles as alkane congeners are more likely to adhere to the oil droplets in the extracted water, which is conducive to improving the air flotation oil removal efficiency of oily wastewater.
Study on Optimal Design of Constant Current Water Distributor
Authors: Wang Jing-qi , Gao Guang-lei , Tong Yin , Yue Qing-feng , Wang Chao 
Published: October 2023

Abstract
Daqing Field has entered the late stage of ultra-high water cut development. The number of subzones of water injection wells is increasing year by year, and the number of zones of high-efficiency annual survey has exceeded 240,000. The testing capacity has reached a bottleneck, the contradiction among test efficiency, test team and qualified rate of water injection is becoming more and more obvious. The constant flow water distributor can keep the water injection quantity of the applied layer basically unchanged under the frequent fluctuation of water injection pressure, the water injection zone will be changed from repeated adjustment to little adjustment or even no adjustment, greatly reducing the testing workload and improving the testing efficiency. In order to further improve the performance of constant-current water distributor, the stress simulation of valve spool of constant-current water distributor was carried out. Based on the mechanical analysis of the valve core of constant flow distributor, the force acting on the valve core of constant flow distributor is obtained by numerical simulation, and the accuracy of the simulation results is verified by laboratory experiments. According to the requirements of starting pressure difference and spring stiffness of constant current water distributor, the constant current water distributor is optimized and perfected. The experimental results show that the error is less than 5%, which meets the requirements of field application. This study provides a basis for further improving the design of constant-current water distributor. Up to now, 392 wells have been tested with constant-current distributor, the effect of constant-current is good, and the average efficiency of single well is increased by 28.3%.
Analysis of the asymptotical average packet error rate over Rician fading channels
Authors: Wu Xiaohe , Ji Xiang , Yuan Yuan , Li Minyu 
Published: October 2023

Abstract
In the paper, we develop a simple and rather accurate method to analyze and research the average packet error rate (PER) in the high SNR region for the packet transmission system over Rician channels. By introducing the concept of inverse coding gain, the calculation expression of the average PER under the Rician fading channel can be obtained. Numerical calculations and simulations validate our theoretical analysis and approximation.
Two-stage UHV GIL Fault Location Based on Ultrasonic Sensor Network
Authors: Xu You , Li Mengqi , Li Xiujing , Zhang Changhong , Jiang Yi , yin Yu , Li Juan 
Published: October 2023

Abstract
The failure of a long-distance Ultra-high voltage (UHV) Gas Insulated Transmission Line (GIL) during operation will cause great security risks to power transportation. How to locate GIL faults quickly and accurately and further carry out related operation and maintenance work is of great significance to the stable operation of the power grid. Based on this, this paper proposes a two-stage fault location method for UHV GIL based on an ultrasonic sensor network. In this method, ultrasonic sensors are configured in the shell of GIL to form an ultrasonic sensor network and internal faults are located by analyzing the signals collected from the network. The method is divided into two stages: 1) according to the collected signal data, the two sensors closest to the fault point are preliminarily identified, and then the fault point is roughly located, and obtain the data collected by the sensors; 2) we analyze sensor signal data, train and establish a network model based on recurrent neural network RNN for accurate fault location. The verification experiment shows that this method has fast location speed and high location accuracy, and can be effectively applied for quick maintenance, safe operation, and maintenance of GIL.
Temperature and Humidity Wireless Sensor System based on Bluetooth Low Energy and Solar Self-power
Authors: Wang Tong , Hou Di , Feng Long , Zhang Wanli , Rao Simin 
Published: October 2023

Abstract
According to the actual needs of the modern greenhouse, this paper designs a low-energy solar self-powered temperature and humidity wireless sensor system based on Bluetooth low energy. The system uses a Panasonic AM-1801 solar panel and S6AE103A single-chip microcomputer as the energy management module to realize the self-power supply of the system, and uses Si7202-A20-IM1 as the sensor module to collect the temperature and humidity in the environment. The monitoring data are transmitted through the Bluetooth wireless network. The receiving end of the upper computer uses the CY8C5868LTI-LP039 module USB Dongle to receive data. The system realizes the wireless data transmission of the temperature and humidity sensor in the greenhouse environment and the real-time network monitoring of the ambient temperature and humidity through the Bluetooth network. This system can be applied to various greenhouse systems.
Estimation of State of Health and Knee Point Identification in Lithium-ion Batteries Using BES-GRU
Authors: Shi Yongsheng , Hu Yujun , Zhai Xinran 
Published: October 2023

Abstract
Accurately assessing the State of Health (SOH) of batteries and conducting knee point detection is of utmost importance in prolonging their lifespan. However, the generalization ability and robustness of individual methods are limited. To address this, a novel lithium-ion battery SOH estimation model is proposed, incorporating the Bald Eagle Search (BES) optimization algorithm in conjunction with the Gate Recurrent Unit (GRU) neural network. The selection of highly correlated health indicators (HI) with battery SOH is performed using the Pearson correlation coefficient. The BES algorithm is employed to optimize the selection of parameters for GRU networks. The model reliability is verified using the MIT-Stanford lithium-ion battery dataset. The results illustrate that the proposed BES-GRU model effectively predicts the SOH of batteries and identifies knee points, effectively improving the estimation accuracy.
Adsorption of Cu (II) from Cu Standard Solution Using Expanded Perlite
Authors: Pamasengi Abdul Malik , Warmada I Wayan , Wilopo Wahyu 
Published: October 2023

Abstract
The research aimed to determine the ability of expanded perlite to adsorb or remove Cu (II) metal ions in the solution. Furthermore can be used to reduce Cu levels in the aquatic environment caused by industrial and mining waste. Expanded perlite is a product of perlite resulting from heating at temperatures above 1000°C. Perlite is a volcanic product contains high silica content and a lot of water content so when heating occurs will increase the porosity and surface area that can cause adsorption. Expanded perlite sized < 1 mm can be utilized in the remediation process of mining waste because it is effective in the adsorption of ions such as Cu so as not to be in aquatic environtment. Expanded perlites, effectively used in the adsorption process, have a grain size of < 1 mm with a dose of 60 g/l. An experimental batch test method was carried out with the parameters of pH, adsorbent dose, and contact time to determine the ability of expanded perlite to adsorb Cu (II). The optimum pH in the Cu (II) metal ion adsorption process was 7 and reached equilibrium within 240 minutes. The adsorption equilibrium (chemical adsorption due to cation exchange) that can be absorbed by 1 gram of expanded perlite is 6.11 mg Cu (II), while the maximum adsorption capacity (physical adsorption due to the hydroxyl group bonded to silica has a high electronegativity value so that it can attract positively charged ions) that can be absorbed by 1 gram of expanded perlite is 1.47 mg Cu (II).
Empirical Designs of Excavation Method and Support System of the Intake Tunnel of Meninting Dam, West Nusa Tenggara, Indonesia
Authors: Metly Aditya Rasdi , Hendarto  
Published: October 2023

Abstract
The intake tunnel of Meninting Dam has been designed based on RMR but with less detailed drill core evaluation in the tunnel area, which will lead to less accuracy in the design. The objective of this study was to evaluate the tunnel’s excavation method and support system using the latest data based on rock mass classification of RMR, GSI, and Q–system. The investigation was conducted by surface geological mapping and core drilling evaluation. The results showed that the tunnel area consists of pyroclastic breccia intercalated with lapilli stone. Based on the rock mass quality, the tunnel can be divided into two sections: Section A has fair quality rock, and Section B has poor quality rock. Based on the empirical designs, the recommended rock and tunnel excavation in Section A by hammer and top heading bench, and Section B by ripping and top heading bench. The recommended supports in all sections were using a combination of rockbolts, shotcrete, and wire-mesh. Even though the empirical approach is helpful in the preliminary design, a numerical study is needed to verify the empirical design so the recommended excavation and support system can be safely applied.
Empirical Method for Engineering Geological Evaluation of Pelosika Dam Diversion Tunnel Design, Southeast Sulawesi, Indonesia
Authors: Diwani J P , Marliyani G I 
Published: October 2023

Abstract
This paper explains a Pelosika Dam Diversion Tunnel in metamorphic rocks (quartz muscovite phyllite) and aims to find out excavation methods, stand-up time, and support systems for tunnel construction. The purpose of this research is that the development of science in tunnel construction with the characteristic of metamorphic rock will increase. Tunnel location in poort rock mass quality based on previous geology investigations. Based on current geology and engineering geological mapping results, diversion tunnel through poor rock mass of metamorphic rocks (phyllite) which have slightly-highly weathered. We classified rock mass quality by GSI, RMR, and Q-System methods which produce the almost same results (poor rock mass quality). The GSI Chart and Pettifer-Fookes Chart which excavation method has the results of the digging and ripping. RMR value determines the stand-up time last 42-240 minutes after excavation. RMR and Q-System values generate the support system which used rock bolts (length= 1.8 m), shotcrete (thick=10-15 cm), and steel sets (spacing=1,5m) if required. A purpose of combination from the different excavation methods and support systems to complement each other and improve the safety of the tunnel without compromising the cost-effectiveness of construction.
The Effects of Palu-Koro Fault on Predicting Ground Motion for Estimating Liquefaction-Induced Settlement of the Educational Infrastructure Reconstruction Project at the University of Tadulako
Authors: Pasin H R , Ismanti S , Hardiyatmo H C 
Published: October 2023

Abstract
The University of Tadulako suffered significant damage after a tectonic earthquake with a magnitude of M 7.5 with a depth of 20 km that occurred on September 28, 2018. This incident happened because of its location very close to the Palu-Koro fault. The Ministry of Public Works and Public Housing was assigned to reconstruct damaged educational infrastructure there. Seismic hazard analysis was needed to prepare reconstruction development projects and mitigation efforts. Many studies are related to predicting ground motion due to seismic fault activity, one of which is the attenuation NGA West 2 models. This study aims to determine the relationship between fault effects and ground motion to estimate liquefaction-induced settlement at this project. The results show that the relationship between the fault effects and ground motion affects various PGA values. PGA value resulting from the CY14 model was used to estimate settlement because it considers the worst condition aspect, where the most significant settlement occurred at the drill point DP-05 of 10.234 cm. This settlement can happen because the liquefied soil layer at the drill point was quite deep compared to other drill points.
Springs and Tourism Facilities Development in Purwosari, Gunungkidul, Special Region of Yogyakarta, Indonesia
Authors: Soviana N N , Putra D P E , Marliyani G I 
Published: October 2023

Abstract
There have been progressive development and construction of tourism facilities such as hotels and restaurants in Purwosari. Besides the tourism development potentials, Purwosari, also has problems related to surface water sources. The research on the existence of springs in this place is urgent to support water needs for tourism facility development near tourism sites. This research consists of two parts: (1) to observe springs’ existence, water quality, relative water quantity, existence throughout the year, and spring’s relative distance to tourism sites, and (2) to determine suitable springs near tourism sites, related to the development of tourism facilities along the southern coast of Purwosari area. Based on field observation and interviews with five key persons in each village, the results show that 27 springs spread over the research area are unevenly distributed. The quality of spring water is good according to its physical-chemical properties. There are 13 springs with relatively abundant discharge, nine springs are relatively near to tourism sites, and 23 flows the water throughout the year. Springs evaluation with the MCDA method for developing tourism facilities along the waterfront of the Purwosari shows that only 11 springs have the potential to be economical and efficient sources of clean water.
The Effect of Kacang Ratu BW on Ration to Production and Business Income of Layer Chickens
Authors: Rahmandriani S. K. , Sasongko H. , Habibi M. F. , Suwignyo B. 
Published: October 2023

Abstract
The research was conducted to determine the effect of Alfalfa (Medicago sativa L.) substitution for laying hen performance. 108 Hy-Line strains on 26 weeks were put in battery cage and divided randomly into three treatments, (with six replications and every replication consisted six hens). The treatments were used 100% basal diet for control (A0), 99% basal diet + 1% Alfalfa (A1), and 97% basal diet + 3% Alfalfa (A2). Data recorded every day on three periods, with twenty-eight days per period. Feed and drink were given by ad libitum. The data collected every day consist of egg production, egg weight, while laying hen performance counted every week consist of Feed Conversion Ratio (FCR), Hen Day Average (HDA). In addition, the estimation of Income Over Feed Cost (IOFC) counted at the end of this period. Data were analyzed by factorial of classification of variance analysis (ANOVA) between Alfalfa and period. of treatment followed by testing significant means Duncan’s Multiple Range Test (DMRT). According to this research, it can be concluded that Alfalfa can be used for substitution on laying hen’s diet due to decrease the feed cost (increase feed efficiency) moreover without declined its production.
Microzonation study around Lake Toba, North Sumatra, Indonesia based on horizontal – vertical spectral ratio
Authors: Anggono T , Anjali D , Marinda E , Haryanti S , Handayani L , Mukti MM , Lubis AM , Gaol KL , Sudrajat Y , Syuhada S , Saputra FRT , Prasetio AD , Hasib M , Febriani F , Dewi CN , Setyonegoro W 
Published: October 2023

Abstract
Lake Toba, North Sumatra, Indonesia, is one of the biggest calderas in the world. The area is also prone to earthquake damage because of the tectonic activity due to its location in the subduction zone of Indo-Australian and Eurasian Plates. In recent years, Lake Toba has become one of the most attractive tourist destinations in Indonesia. Hence, the Indonesian government has been considering infrastructure development in this region. The region vulnerability cause by soil amplification due to the earthquake activity can be quantitatively investigated. We carried out a microzonation analysis around Lake Toba using Horizontal-Vertical (H/V) Spectral Ratio method. A total of about 30 short-period seismometers around Lake Toba were used for the analysis. We estimated several parameters that may define some soil characteristics, such as H/V peak amplitudes, peak frequencies, average shear wave velocity of 30 m depth (Vs30), and vulnerability index (Kg). Spatial distribution of peak frequencies and Vs30 suggest that the region may fall into sites SC and SD showing characteristics of dense to stiff soil. We also observed areas with a high vulnerability index (Kg > 20), which may indicate the high possibility of soil vulnerability due to strong earthquakes. The findings may provide preliminary results or sources for future geophysical, geological, and geotechnical analysis for disaster risk reduction in this high-risk region.
Symptoms of Gentrification in the Yogyakarta Urban Area and Its Implications for the Sustainability of Yogyakarta City
Authors: Nugrahaningtyas F T , Marwasta D 
Published: October 2023

Abstract
One of the most common symptoms in developing country cities today is gentrification. Gentrification is the recessive of residence of economically weak groups by strong investors. This study tries to examine gentrification in Yogyakarta urban area and its implications for the sustainability of Yogyakarta city. The spatial approach is used in this study considering that space is an integral part of a city which is a place for various urban activities and functions. In general, this research aims to: (1) Identifying the symptoms of gentrification in the Yogyakarta Urban Area; and (2) Assessing the implications of gentrification on urban sustainability. This research is a study in the field of geography with the main focus on the spatial approach. The data analysis framework in this study consisted of two kinds, namely spatial analysis and descriptive statistical analysis. The results showed that (1) the symptoms of gentrification in the Yogyakarta urban area had occurred in several places, and (2) the gentrification that occurred had implications for the sustainability of the city, both positive and negative.
Manganese prospecting using time domain induced polarisation (TDIP), case study: Karangnunggal district, Tasikmalaya regency
Authors: Antosia R M , Yolandika R , Parnadi W W 
Published: October 2023

Abstract
Indonesia has good manganese potential, but its utilization has not been optimal. It has been unable to meet domestic needs because of the low production level. Thus, it needs to conduct more exploration activities. Karangnunggal district, Tasikmalaya regency, is one of the manganese minerals located. The method to prospect the manganese distribution in the area was applying a geophysical approach. The measurement employed the time domain induced polarisation (TDIP) method in 17 lines. In this study, the process deployed the Wenner array. Each line has a length of about 117.5 m with an electrode spacing of 2.5 m. The outcome shows that a manganese mineral has a chargeability of more than 5 ms. Based on the 3D visualization, it can be identified that most deposits spread to the south and the east while partially located in the north and the west of the study area. The 3D chargeability modeling generates the estimating manganese volume of about 2.4 million cubic meters.
The effect of disaster knowledge on community preparedness in dealing with liquefaction disaster in Palu City, Central Sulawesi
Authors: Sekartaji D A , Mei E T W 
Published: October 2023

Abstract
Liquefaction occurred in Palu City on September 28, 2018 caused hundreds of casualties and thousands of buildings were damaged. The event became the Aha! Moment for many people that liquefaction disaster is real and people were not aware of the threat despite the mapping of liquefaction susceptibility in Palu had been published by Geological Agency in 2012. This study aims to analyse disaster knowledge and preparedness, as well as its influence on community preparedness in facing liquefaction. Quantitative method is used in this research by using questionnaire as primary data source to collect information regarding two variables namely disaster knowledge and community preparedness. Respondents were achieved by drawing the samples by accidental sampling. Quantitative descriptive analysis and Simple Linear Regression analysis were used to answer the objectives of this study. The results showed that disaster knowledge is in the high category generally, while community preparedness is in the medium category. Disaster knowledge has a positive and significant effect on disaster preparedness of the Palu City community in facing the threat of liquefaction, which is 43.8% with a regression coefficient of 5.013. This indicates that if disaster knowledge is higher, community preparedness will increase as well.
Composition of lost and discarded fishing gear (ghost fishing) in the blue swimming crab fishery in Rembang, Central Java
Authors: Satria M B , Wicaksono R Z , Utomo R P 
Published: October 2023

Abstract
Ghost fishing is the ability of fishing gear to catch fish continuously for a certain period when the fishing gear has been lost. Some passive fishing gear will most likely be lost due to material degradation of gear components and other factors. Therefore, it is necessary to study the composition of fishing gear left in the sea to find out the cause of ghost fishing. The study aimed to determine the composition of materials from fishing gear left in the waters of the Rembang Sea. This is done by collecting fishing gear found by fishermen and then weighing per material to get the composition of the fishing gear. As many as 86% are metal, and 14% are plastic. This shows that metal and plastic materials are difficult to decompose in marine waters, so fishermen still find these fishing gear in Rembang waters. This also shows that metal is the dominant constituent of the fishing gear used by fishermen in Rembang waters. This research provides information about what fishing gear materials are likely to be a source of ghost fishing so that it can be a suggestion for using fishing gear.