bluuebunny/crossref_metadata_2025_split huggingface dataset:
A Novel AC-DC Hybrid Microgrid Control Strategy Based on VSM
Authors: Jiao Deqiang , Li Zerui 
Published: May 2021

Abstract
It is an important goal of the microgrid control system to realize the rational allocation of power between the AC and DC microgrid by using the power electronic converter to integrate the renewable energy into the power distribution system. This paper introduces the Virtual Synchronous Generator (VSM) control strategy of hybrid microgrid, which solves the above problems by mimicking the characteristics of traditional Synchronous Machine (SM). In order to better optimize the performance of AC/DC hybrid microgrid, a novel VSM-based bidirectional converter (BC) control strategy is proposed, which also ensures the capability of BC independent power allocation. Finally, in the PSCAD environment, two types are used. The hybrid microgrid with different BC control structures was studied and compared.
Research on External Fault of Salient Pole Synchronous Motor at Rated Load
Authors: Shen Yubo , Zhou Hongyi , Li Zhibin , Han Siwei , Xu Minhu , Shang Shulei , Zhou Meng , Yao Xuyang 
Published: May 2021

Abstract
The pumped storage power station is an inevitable product of the power system structure and power supply demand development to a certain stage, and it is a necessary management tool to ensure the safe and stable operation of the power system. Pumped storage power plants have the ability to improve and balance the load of the power system, which can improve the quality of power supply to the power grid and improve overall economic benefits. With the development of high-tech industries such as informatization and digitization and the improvement of people’s living standards, society has higher and higher requirements for pumped storage power stations. Pumped storage motor is a three-phase salient-pole synchronous motor used in pumped storage power stations. This paper simulates and analyzes the stator voltage, current and electromagnetic torque when single-phase grounding short circuit, inter-phase short circuit, and two-phase grounding short circuit occur in pumped-storage motors, and the law of change is obtained.
Effect of Monitoring Points on Detection Accuracy of Incomplete Blockage in CO2 Pipeline
Authors: Chen Bing , Zhang Shuxuan , Kang Qinghua 
Published: May 2021

Abstract
Based on the transient pressure wave method, this paper uses OLGA simulation software to detect CO2 incomplete pipe blockage, sets different monitoring points in the pipeline, uses its pressure response data for the calculation of blocking position, blocking length and strength, and determines the best monitoring point by analyzing the relative error of specific blocking parameters. For blockage length, when the monitoring point is close to the blockage position, it has the highest measurement accuracy and a relative error of less than 0.535%. Therefore, the monitoring point should be set up separately at the pipe entrance and near the front of the blocking position, so that the internal blockage of the pipe can be detected more accurately and effectively.
On-line calibration facility of compressed hydrogen dispenser based on weighing method and master meter method
Authors: Li Haiyang , Li Xuejing , Yao Xinhong , Song Jin , Chen Yuyang 
Published: May 2021

Abstract
This paper introduces a kind of on-line calibration facility based on weighing method and master meter method, which can carry out the on-site and laboratory calibration of 35MPa/70MPa hydrogen dispenser. At first, the working principle and technical specifications of the hydrogen dispenser is explained. Then the working principle and design structure of the calibration facility is depicted. Finally, the calibration facility is used to perform the real flow calibration test on hydrogen dispenser. According to the test results, the expanded uncertainty of the calibration facility of master meter method is about 0.7% (k=2), and the expanded uncertainty of the calibration result is 0.96% (k=2); and the expanded uncertainty of calibration facility of weighing method is about 0.097% (k=2), and the expanded uncertainty of calibration result is 0.48% (k=2). The real flow test shows that the two method calibration facilities both can be used for actual calibration of 2.5-level hydrogen dispenser. The calibration facility of weighing method is suitable for the occasions with high accuracy requirements because of its short traceability chain, while the calibration facility of master meter method can be used for flexible on-line calibration because of its simple structure.
Analysis of The Impact of New Energy Development and Utilization on The Environment and Economic Growth
Authors: Zhang Yihua , Liang Jingjing 
Published: May 2021

Abstract
Since the reform and opening up, my country’s economy has grown rapidly, becoming the world’s second largest economy, and its energy consumption has continued to increase. Extensive use of traditional energy sources severely damages the ecological environment, and due to its non-renewable characteristics, the world today is facing a shortage of resources, which is not conducive to sustainable economic development. In this context, countries have begun to vigorously develop and utilize new energy. Therefore, this article first introduces the concept, characteristics and basic classification of new energy in order to have an in-depth understanding of it; then analyzes the impact of the development and utilization of new energy on the environment and economic growth; and finally puts forward relevant suggestions on how to better develop and utilize new energy.
Improving the hole extraction by hexadecylbenzene modification for efficient perovskite solar cells
Authors: Xie Lisha , Deng Xiaoyu , Li Chengbo , Hao Feng 
Published: May 2021

Abstract
In highly efficient halide perovskite solar cells (PSCs), nickel oxide (NiOx) have been widely used as an inorganic hole transport layer (HTL). However, the solution-processed NiOx films always have pinholes, along with inferior contact with perovskite layer. Herein, a surfactant of hexadecylbenzene (HAB) was applied to improve the hole extraction from perovskite to NiOx HTL. With the modification of HAB, a high quality perovskite layer was obtained. Due to the enhanced hole extraction, the HAB modified device showed a higher short-circuit current density (JSc
) and a power conversion efficiency of 17.11%. Therefore, this work offers a novel strategy in interfacial engineering for high-efficiency PSCs.
Analysis of Influencing Factors of Transmission Line Operation Safety and Prevention Countermeasures
Authors: Hu Yuwei 
Published: May 2021

Abstract
At present, the coverage of transmission lines is becoming wider and wider, and its environment is very complex. In bad weather, transmission equipment is prone to failure. However, in the process of transmission line operation, there are many influencing factors that have a great impact on its operation and inconvenience people’s lives. Therefore, power grid enterprises will improve the safety of transmission line operation as the primary problem. This paper briefly introduces the operation of the transmission line, finds out the objective factors that affect it, and puts forward the prevention countermeasures, so as to improve the safety of the operation of the transmission line.
Research on energy problem based on cointegration test
Authors: Yan Zhang 
Published: May 2021

Abstract
In this paper, the VAR model is used to determine the optimal lag order, and the dynamic relationship of each endogenous variable in the time series is predicted and analyzed, so as to effectively predict the interrelated time series variables. On the basis of the stationarity of the test variable series, this paper uses co-integration test and Granger causality test to conduct dynamic empirical analysis on the total energy amount and related variables in Shaanxi Province from 2000 to 2019. The research shows that there is a long-term stable equilibrium relationship between total energy and other variables.
Construction of automatic demand response dynamic model for distributed new energy consumption
Authors: Xu Menghan , Wang Chong , Gong Chuanzheng , Yan Qibo 
Published: May 2021

Abstract
Based on the current situation of demand side management in China, considering the output characteristics of new energy, this paper analyzes various influencing factors of automatic demand response from the aspects of user response mode, power consumption characteristics, response time, load economy, etc. Taking energy storage air-conditioning users as an example, the paper uses real-time electricity price as demand response incentive measure for demand regulation, and verifies the implementation effect of the optimal response strategy of electricity price incentive.
Research on Transportation Technology and Disposal Plan of Oil Storage in Deepwater Sunken Ship
Authors: Zou Yunfei , Zhang Panpan , Ning Weiting 
Published: May 2021

Abstract
Due to the complex hydrological conditions, large water depth, complex operation technology, and large construction difficulties, the disposal of oil storage in the sunken ship is very difficult. Taking the oil storage in the sunken ship as the object, the technologies of rapid extraction, shuttle transportation and transfer of the oil are mainly studied. The disposal plan of the oil storage in the sunken ship is put forward. The plan can meet the requirement that the oil is directly pumped from the cabin to the working ship. The plan also provides decision and technical support for oil spill emergency disposal of the deepwater sunken ship accident.
Study of Fungal Decomposition Rate
Authors: Xu Yezhao , Zhang Han , Feng Guanang , Zhu Libin , Pang Hua 
Published: May 2021

Abstract
Fungi are critical to the carbon cycle. The growth rate model of fungi was constructed from three aspects of temperature, humidity and pH, and the moisture tolerance model of fungi was constructed from two aspects of competitive ranking and water ecotone width. Combined with related references, a fungal decomposition rate model was constructed based on the growth rate and moisture tolerance models. Under the given environmental conditions, the decomposer mass change curve was obtained by solving with MATLAB software, and the effect of environmental changes on the curve trend was investigated by the control variable method. The curve of decomposer mass change was obtained by calculating the competitive rank of the population and combining it with the fungal decomposition rate model.
Preparation and process optimization of tea polysaccharide-nano-selenium
Authors: Xia Bailin , Xu Su , Liu Yuguo , Li Junbin , Li Huanxing , Zhang Yalin 
Published: May 2021

Abstract
Response Surface Methodology (RSM) was used to study the effects of reaction temperature, the mass fraction of tea polysaccharide and the VC/Na2SeO3 ratio (M/M) on the particle size of composite. The complex was characterized by UV, Zeta potential, XRD and FT-IR. When the mass fraction of tea polysaccharide is 4‰ and the VC/Na2SeO3 ratio (M/M) is about 5:1 at 50°C, the particle size of the complex can be less than 70 nm.
Rupture directivity and fault plane determination from analysis of rupture duration using broadband P-waves of the September 2018 M
w 7.5 Palu, Indonesia earthquake
Authors: Madlazim  , Prastowo T , Fahmi M N 
Published: May 2021

Abstract
The aim of this study is to determine earthquake rupture directivity and fault plane of the 28 September 2018 M
w 7.5 event in Palu, Indonesia. The data used in the current study were all acquired from broadband seismograms recorded by a network of 56 seismic stations. The method included analysis of rupture duration, where T
dur was calculated using the vertical component of P-waveforms downloaded from IRIS site at http://ds.iris.edu/wilber3/find_event. For all stations involved in the T
dur calculations, the largest distance between the epicenter and the corresponding station was estimated to be 40° from the azimuth station. The direction of the rupture indicated fault plane geometry of the source. The rupture directivity was found to be at azimuth 179°, in good agreement with the Palu Koro Fault azimuth. The finding implies that the direction of the earthquake rupture passed below the sea surface of Palu Bay, which could be the main source of the tsunami.
Determination of Potassium Concentration in Solution Using Optical Fiber Sensors
Authors: Budiyanto M , Yasin M , Suhariningsih  , Mahdiannur Muhamad Arif 
Published: May 2021

Abstract
Potassium is a mineral that has an important role in maintaining fluid balance in the human body and controlling blood pressure in the body. In addition, potassium also plays a role in maintaining the function of the muscles and nerves that control the heart. The development of instruments and methods developed to obtain more accurate measurements of potassium concentration requires an institution with high sensitivity. One of the instruments utilizes the principle of electromagetic wave symptoms made by optical sensor systems with the use of optical fibers for waveguides to maintain their intensity stability. The optical fiber bundle instrument in the optical sensor system to determine potassium concentration in the hope that this instrument can present accurate measurement parameters and better sensor sensitivity. In this study, samples of standard solutions with potassium as a solute and pure water function as solvents. Potassium solution samples that are in the bottom of the vessel there is a flat mirror that reflects the laser beam that has been through the process of absorption by the sample solution. The reflected neon helium laser is transmitted through the optical fiber receiver to measure the change in wave intensity using an optical detector. The intensity of the reflected laser beam waves is read by an optical detector and converted to an electrical energy display by measuring the maximum electrical voltage using a digital voltmeter. The parameters measured in the experiment investigate the relationship between the change in the concentration of the potassium solution and the maximum voltage read on a digital voltmeter. The results of data analysis determine the concentration of potassium to achieve high sensitivity, linearity and accuracy with a sensitivity value of 0.01 mV/ppm, linearity of more than 99%, linear range of 0-10 ppm, so the instrument is very valid and high sensitivity.
Designed Coastal Dike to Counter Natural Disaster of Big Waves at Toseho Village
Authors: Suyuti Suyuti , Misbah Zulkarnain K. , Ardhana Zhafirah M. 
Published: May 2021

Abstract
One of many cases of abrasion problemsin the coastal areais Toseho Village in South Oba subdistrict, North Maluku province. About thirty years ago, village residents have to evacuate to high land area due to abrasion damage that is caused by natural disaster of big waves from the pacific ocean. The abrasion progress is also triggered by deposit subsoil. By those problems, several families are still survived to stay because of living as fishermen, it is about 15 families. However, they do not have any construction to safeliving under attacking natural disasters. Therefore, this study is proposed a design method using empirical way to design a dike for countering the natural disaster in recovery area land. The tidal waves investigated by using Global Positioning System (GPS) and subsoil properties observed by practically way along the coastline of residential. The coastal dike has to design by considering stability criteria such as bearing capacity and factor of safety, which are conducted by several empirical equations. Finally, the results of field investigation for cross section about 30 meters on perpendicular direction to the coastline for along 483 meters are obtained different ground level average 2.0 meters at the coordinate of 0°20’57,91″U and 127°39’17,30″T. The subsoil identified as silty and sands materials at the ground surface, which is parameterof loose density. The simulation results of empirical way are obtained ultimate bearing capacity of the subsoil qu
of 31.2 t/m2, factor of safety for overturning Fs1 of 3.5 and factor of safety for sliding Fs2 of 1.8. Then, factor of safety for bearing capacity of subgrade Fs3 of 0.63, which is loaded by pressure at beneath the dike p of 49.74 t/m2.
Studied Internal Stability of Masonry Construction for the Fort Oranje Ternate
Authors: Suyuti Suyuti , Ibrahim Maulana , Imran  
Published: May 2021

Abstract
Based on information board data, the Fort Oranje Ternate founded in the year 1607. It was 412 years old, where Fort Oranje constructed by masonry with main materials of the coral river and coast marine with lime mortar. However, Fort Oranje at the south side was collapsed on August 24th, 2017. This research is to study the collapsing problem of the fort construction, authors were investigated in field and found a collapse area about 24 meters in length, and 5.7 meters in height. In visualization views show that fort construction failure due to internal stability indication. Therefore, to measure the physical and chemical parameters of Fort Oranje construction for calculation, authors are taken some mortar samples in the field, and bring it into laboratories. In which, mortar samples have to observe the quality by using a compression machine in Structure and material laboratory, chemical contents analyzed in the Chemical laboratory. Finally, the results of the compressive test machine for lime mortar are found on average about

σ
t
′

of 1.2 MPa and it is less than 19,9 MPa for normally mortar material with cement. Geometrical fort existing consisted of width at top b1
of 0.70 m, width at bottom b2
of 1.20 m, the total weight of masonry W of 108.3 kN. Then, soil fill parameters such as bulk density γs
of 17.2 ~ 19.2 kN/m3, internal friction φs
of 16.5°, cohesion c ≈ 0, and height hr
of 3.26 m. Finally, simulation results for height hk
= 3.26m ~ 3.9m are obtained factor of safety for overturning Fs1< 2.0, Meanwhile, a factor of safety for sliding Fs2 at the base are found Fs2 of 1.43 ~ 1.53. Moreover, Chemical content analyzed by XRF test method for the lime mortar sample is obtained by dominating Calcium Oxide (CaO) of 78.81%.
Corrugated Sheet Pile Analysis on Riverbank Retaining Wall Project in Factory Area of the Sukoraharjo Street
Authors: Triarso Arik , Risdianto Yogie 
Published: May 2021

Abstract
This retaining wall projects serves to hold the land close to the riverbank in the factory area of Sukoraharjo street, Malang. The height of the riverbank starting from the bottom of the river to the upper edge is around 7 m. The shape of sheet pile is determined using corrugated sheet pile. Calculation method using Plaxis 2D software. The stages of modeling in 2D Plaxis starts from determine the geometry of the soil profile and sheet pile. Then determine the input parameters of soil and sheet pile. After that determine the generate mesh opsi in the initial or existing geometry and conditions. After the procedure the calculation is done with the phases that have been determined. From the results of Plaxis 2D modeling and stability and strength analysis, that corrugated sheet pile type W - 500 Class B with a permanent permit moment of 299 kN m can be used as a retaining wall for riverbank with a height of 7 m in the factory area of Sukoraharjo street, Malang.. The depth of the corrugated sheet pile is embedded as deep as 7 m so that the total length of the sheet pile is 14 m. The safety factor value of the corrugated sheet pile stability is 2.98. This value is in accordance with the requirements of SNI 8460 - 2017.
Mathematical Model of Traffic Speed and Capacity in the Archipelago Base
Authors: Gaus A. , Muhammad T. Y. S. , Ambo U. S. H. , Liska N. 
Published: May 2021

Abstract
The transportation engineering developing who the application of the principal use planning, analysis and design to the disciplines comprising transportation: its vehicles, physical infrastructure, safety in travel, environment impacts and energy usage. The mathematical model in base archipelago was not much enough to research by transportation practiced. It had been of characteristic which different mainland. This paper using greenshields and greenberg models for approach real condition of the base archipelago. In the transportation involves working with the businessman, with industry, with citizen group, with elected officials, and with employes to the joint each segment of the public strip depended on at least one constructed facility. In this time there three components that included the discussion of the traffic of a microscop scale were flow, density and speed. At the greenshields model, the speed-density relationship show whose the value of speed higher than value of density lower with determination value 0,9755 where the curve of flow-density relationship show the value determination 0,8634 and for curva of flow-speed relationship showing whose maximum value of flow 1807 vehicles/hour at the value traffic speed 46 km/hour, traffic speed which at the lower or it the higher, so it condition given impact that the value of flow will going to low. on the other hand for greenberg model at speed-density relationship’s determination 0,9463, density-flow relationship show that the value minimum of density is 25 vehicles/km while value of flow is 1400 vehicles/hour and the relationship between flow-speed curve show that value maximum flow 1750 vehicles/hour with value speed 37. Base the value of each condition, so the greenshields model was better than greenberg model for this research. The mathematical model of the traffic flow which approach the real condition for the base archipelago was greenshields model.
Prototype of College Student Attendance Using Radio Frequency Identification (RFID) at Musamus University
Authors: Putra Nasra Pratama , Dolfi Loppies Stanly Hence , Zubaedah Reza 
Published: May 2021

Abstract
Student attendance in the classroom is one indicator for lecturers in learning activities. At Musamus University, student attendance has been managed digitally. The system is known as SIMAKAD. The weakness of SIMAKAD in doing attendance is in the process of entering data. Student attendance data can be inputted by the lecturer after completing the manual signature process by students. This can cause errors in entering data into the system. Whereas in the industrial revolution of the 4.0 era, the transformation of digital data in education was needed. For example, with the presence of Radio Frequency Identification (RFID) technology. The student attendance prototype using RFID was designed as a solution to solve problems in entering student attendance data at SIMAKAD. RFID technology can identify each student while attending college through reading the student TAG ID. By adding Internet of Things (IoT) capabilities, the results of reading student IDs will be sent directly through the internet and stored in a database server. The database can be directly used by lecturers as monitoring attendance of lectures. So no need to use manual absence.