bluuebunny/crossref_metadata_2025 huggingface dataset:
Cosmological dynamics of relativistic MOND
Authors: Kashfi Tahere , Roshan Mahmood
Published: October 2022

In this paper, we investigate the recently proposed relativistic theory for MOND using phase space analysis. Unlike its precedent theory, namely TeVeS, this theory is claimed to agree with the observed Cosmic Microwave Background and matter power spectra. We convert the background cosmological equations of the theory to a set of first-order autonomous equations. Then we explore the corresponding fixed points and their physical meaning. This method is powerful in the sense that the cosmological behavior of the model is diagnosed independently of the magnitude of the free parameters of the theory. We show that the theory has a viable sequence of cosmological epochs. Although this theory mimics the standard cosmological model when specific conditions are used, it provides a richer structure as far as the background cosmology is concerned. This implies that further investigations are required to see if this theory contributes to addressing the current cosmological tensions.
One likelihood to bind them all: Lyman-α constraints on non-standard dark matter
Authors: Hooper Deanna C. , Schöneberg Nils , Murgia Riccardo , Archidiacono Maria , Lesgourgues Julien , Viel Matteo
Published: October 2022

Recent cosmological tensions have rekindled the search for models beyond ΛCDM that cause a suppression of the matter power spectrum. Due to the small scales accessible to Lyman-α data they are an excellent additional tool to probe such models. In this work we extend a recently-developed approach for using Lyman-α data to constrain the power spectrum suppression caused by almost any mixture of cold and non-standard dark matter. We highlight the steps involved in the development of a corresponding likelihood that will be publicly released upon publication of this work. We study three examples of models suppressing the power spectrum, namely feebly interacting dark matter, dark matter interacting with baryons, and mixed cold+warm dark matter. The latter two can be well constrained from Lyman-α data, and we derive novel conclusions on the cosmologically allowed parameter spaces, including finding a mild preference for non-zero interactions between dark matter and baryons. The consistency of the constraints obtained on these models highlight the robustness and flexibility of the likelihood developed here.
Concerted versus stepwise mechanisms of cyclic proton transfer: Experiments, simulations, and current challenges
Authors: Cheng Yi-Han , Zhu Yu-Cheng , Li Xin-Zheng , Fang Wei
Published: October 2022

Proton transfer (PT) is a process of fundamental importance in hydrogen (H)-bonded systems. At cryogenic or moderate temperatures, pronounced quantum tunneling may happen due to the light mass of H. Single PT processes have been extensively studied. However, for PT involving multiple protons, our understanding remains in its infancy stage due to the complicated interplay between the high-dimensional nature of the process and the quantum nature of tunneling. Cyclic H-bonded systems are typical examples of this, where PT can happen separately via a “stepwise” mechanism or collectively via a “concerted” mechanism. In the first scenario, some protons hop first, typically resulting in metastable intermediate states (ISs) and the reaction pathway passes through multiple transition states. Whilst in the concerted mechanism, all protons move simultaneously, resulting in only one barrier along the path. Here, we review previous experimental and theoretical studies probing quantum tunneling in several representative systems for cyclic PT, with more focus on recent theoretical findings with path-integral based methods. For gas-phase porphyrin and porphycene, as well as porphycene on a metal surface, theoretical predictions are consistent with experimental observations, and enhance our understanding of the processes. Yet, discrepancies in the PT kinetic isotope effects between experiment and theory appear in two systems, most noticeably in water tetramer adsorbed on NaCl (001) surface, and also hinted in porphycene adsorbed on Ag (110) surface. In ice I
h, controversy surrounding concerted PT remains even between experiments. Despite of the recent progress in both theoretical methods and experimental techniques, multiple PT processes in cyclic H-bonded systems remain to be mysterious.
Research on optimal operation of grid-connected microgrid based on improved whale algorithm
Authors: Shi Qi-Feng , Yin Chang-Yong
Published: October 2022

In this paper, a small microgrid system is composed of wind turbines, photovoltaic generators, micro gas turbines, fuel cells and battery energy storage devices. In order to realize the optimal operation of the grid-connected microgrid, a multi-objective optimal operation model with economical and environmental friendliness is established. Secondly, an adaptive strategy is introduced for the whale optimization algorithm (WOA) to improve the optimization accuracy and convergence speed of the whale algorithm. The improved whale algorithm is used to solve the target model, and the optimal operation scheme of each distributed power source in the microgrid is obtained, and the simulation analysis results are compared to verify the rationality of the improved whale algorithm.
Research on high voltage cable fault location technology based on neural network
Authors: Yuan Qi , Xu Qiang , He Bangle , Ye Ting , Zhang Wei , Xuan Chenyang , Zhu Yijia
Published: October 2022

At present, high voltage cables are widely used in urban transmission system. When cable fault occurs, the speed of locating fault point and the accuracy of locating fault point play a decisive factor for power system to restore power supply quickly. This article adopted the method of neural network model based on the traveling wave ranging method. It could judge the fault location of 35kV~500kV high-voltage cable more quickly and accurately. Then, we have designed a portable high volt cable fault location device, which has been tested in the domestic power plant. The experiment showed that it could quickly determine the nature and location of power cable faults, shorten the time of blackouts and reduce the loss caused by blackouts.
Research on photovoltaic MPPT control Strategy based on improved sliding mode control
Authors: Li Huixiu , Zhao Lina , Tian Shuo
Published: October 2022

MPPT intelligent control strategy algorithm is complex and practical application is difficult, So an improved sliding mode controller is proposed, which can improve engineering application, but also quickly and stably track the maximum power point of the system. In this paper, Boost circuit as the carrier, by increasing the amount of control in the controller, to build a new sliding mode control algorithm, Lyapunov stability theory analysis to demonstrate the correctness of the design algorithm, and through Simulink modeling and simulation, verify the feasibility of the control algorithm. The results show that the controller can quickly and stably track the maximum power of solar cells with small chattering and strong anti-disturbance ability regardless of the change of ambient temperature or light intensity.
Research on Independent Live Replacement Method and Equipment for Suspension Clamp of ±800kV Transmission Line
Authors: Fu Yanyi , Xu Li , Wang Zhigang , Chen Fang , Wang Yan
Published: October 2022

UHV transmission lines are of great significance to the long-distance transmission of electric energy. Suspension clamp is a common hardware of line tower, and its maintenance method has large load transfer and low working efficiency. Aiming at this problem, the independent live replacement method of suspension clamp is put forward, the safety is analyzed, and the simulation analysis and test verification of the developed equipment are carried out. The results show that the research results can greatly reduce the transfer load and improve the working efficiency, which is of great significance to this type of maintenance.
Electric vehicle battery charging interference intelligent protection device
Authors: Xie Li , Liu Baojun
Published: October 2022

The frequent occurrence of fire accidents in the charging process of electric vehicles is a relatively concerned problem. This paper has targeted analysis of electric vehicle fire causes, and the harm caused by fire. This paper puts forward the prospect and significance of battery interference protection device, analysed the working principle of battery charging interference intelligent protection device according to the types and characteristics of electric vehicle battery, and points out the important role of battery interference protection device, which has practical significance.
Research on intelligent photovoltaic control and protection switch based on fuzzy PID controller
Authors: Hao Qingshui , Yan Honghua , Tian Bin , Zhang Aimin
Published: October 2022

In recent years, intelligent electrical equipment has been widely used. Control and protection switches (CPS) have the functions of circuit breakers, relays, disconnectors and many other products, etc. The intelligent PV low-voltage switch based on fuzzy PID controller designed in this study is applicable to the low-voltage PV distribution network with rated voltage of 500V and rated current up to 1200A with direct grounding of the neutral point of three four wires. The intelligent photovoltaic low-voltage switch designed in this paper can provide indirect contact protection to the distribution network, which can reduce the occurrence of grounding accidents caused by equipment insulation damage; the intelligent photovoltaic low-voltage switch designed in this paper is equipped with a wireless transmission module, which applies the wireless communication technology to the power equipment, so that the power equipment can realize the functions of remote monitoring the operation status of the power grid and controlling the switch breaking and closing. Finally, the fuzzy PID controller is introduced to improve the reliability of switch operation.
Design of new adjustable fine reactive power compensation device
Authors: Hao Qingshui , Yan Honghua , Lv Yanjun , Wang Rongjian
Published: October 2022

With the rapid development of China’s national economy, the level of power system construction and operation management has been greatly improved compared with the past, but the requirements of power users for power production and management departments are also higher and higher. A lot of research work has been carried out on how to improve the power supply reliability, rapid repair ability and controllability of power system. The new type of fine reactive power compensation device introduced in this paper can better meet the above requirements, which reflects the current frontier technology direction of reactive power compensation development, and will play an increasing role in improving the voltage stability of China’s distribution network, improving the power factor of equipment and enhancing the transmission capacity.
Research on pipeline connection structure of microwave load water-cooling system for spacecraft thermal test
Authors: Wu Yue , Huang Nianzhi , Sun Juan , Du Peng , Cao Zhengbin
Published: October 2022

The microwave load water-cooling system was operated in a vacuum cold black environment, and the pressure difference between the inside and outside of the water pipe could reach 0.3 to 0.4 MPa. To ensure the tightness of the water pipe, a conical seal structure was selected, the macro-static model and micro-boundary element contact model were established for the two forms with and without the Viton seal. The macro model simulation was performed by the finite element method to obtain the stress distribution inside the conical structure under different preload stress, the relationship between the contact pressure of the conical sealing interface and the contact area of the O-ring sealing interface as a function of preload stress; the method was used to calculate the micro-contact model, and the critical contact pressure and contact area to achieve the sealing requirements were obtained respectively without Viton seal and with Viton seal. As a result, a conical seal structure with a Viton seal was finally chosen for application. After verification, the structure meets the requirements for the use of microwave load water-cooling systems during the vacuum thermal test.
Design and measurement of a single-band metasurface sample in the terahertz band
Authors: Xu Hengbo
Published: October 2022

A single-band metasurface sample in the terahertz band is designed, simulated, and measured. This terahertz metasurface sample reveals a transmission peak. And the resonance frequency of this peak is 2.06THz (amplitude is 0.74, half-bandwidth is 0.7THz). In experiments, the diameter is reduced, which leads to the amplitude is enahcned and this peak move to low frequencies. The parameter T3 is reduced, which results in the amplitude of the transmission peak strengthened, while the resonance frequency stable. When the incident angle of the electromagnetic wave is increased, this transmission peak is reduced and the resonance frequency moved to the low frequencies. The polarization angle is increased, the metasurface sample exhibits similar resonance behaviors.
Development and experiment of high efficiency gradient filter based on inverse problem solving method
Authors: Mao Xumin , Zhong Xiaopu , Xu Yuzhe , Jin Zhen , Peng Xi
Published: October 2022

In order to design the gradient filter for indoor air purification accurately and quickly, an inverse problem design method was proposed, and the best gradient filter meeting the design requirements was developed. The filtration performance test of the gradient filter was carried out, and the test results meet the design target value. The theoretical calculation values and test values of filtration efficiency and resistance are compared and analyzed. It is found that their theoretical calculation values and test values are within the normal deviation range, which verifies the feasibility and correctness of the inverse problem solving method.
Reliability Evaluation Method of New Energy Distribution Network Based on Improved Correlation Weight Method
Authors: Zhang Mingze , Shi Fangdi , Qiu Cheng , Chu Linlin
Published: October 2022

The reliability of the distribution system includes adequacy and security. Adequacy refers to the degree to which the system capacity meets the power and energy demand of the load. Security is the evaluation of the system’s ability to withstand sudden failures. In view of the uncertainty of decision factors and the difficulty to quantify the weights in the process of reliability evaluation of distribution network, an evaluation method for load restoration of a smart distribution network based on the improved relevance weight with index correlation and improved analytic hierarchy process (AHP) is proposed. The paper also proposes an evaluation system including distribution network structure level indexes. The planning scheme of the distribution network is comprehensively evaluated, and the effectiveness of the method is analyzed through the comparison of actual cases combined with the indicators of the grid structure level. Experimental analysis shows that compared with the traditional power supply reliability or system average outage time, the global index considering LRP is more refined in describing the impact of outage, and the evaluation results are more accurate.
Hot Spot Detection of Photovoltaic Module Infrared Near-field Image based on Convolutional Neural Network
Authors: Fan Fu , Na ZhiXiong , Zhang ChangZhi , Li HaoRan , Tong ChaoLiu
Published: October 2022

With the installation and use of large-scale photovoltaic systems around the world, the detection of photovoltaic system operation and maintenance has become increasingly important. This research uses a convolutional neural network training model to detect and classify the infrared near-field images of photovoltaic modules from small-scale photovoltaic plants in the laboratory. This model classifies the images into two categories: with and without hot spots, with a classification accuracy of 96.58%. The experimental results show that the convolutional neural network training model has a good classification result
Mobile robot communication fault diagnosis method based on swarm intelligence algorithm
Authors: Wen Junfeng , Feng Dengchao , Ding Zhaoxia , Wang Yao
Published: October 2022

The current communication fault diagnosis methods mainly focus on the classifier with fault probability, which often leads to the low diagnosis efficiency. In order to overcome the above problems, mobile robot communication fault diagnosis method based on swarm intelligence algorithm is proposed in the paper. Firstly, the abnormal data is extracted after the analysis of the communication data with Kalman filter. Secondly, the supporting decision model was designed to standardize the communication exchange process and locate the fault range. Futher more, the ant colony optimization algorithm combined with particle swarm optimization was used to locate the fault area, and the multi-model hybrid method was adopted to comprehensively judge the communication fault. The different interference ratio was used in the experiment to test the performance of the proposed algorithm compared with the SVM and Bayesian model. Finally, the experiment results show the validity of mobile robort communication fault diagnosis based on swarm intelligence algorithm.
Optimal Peak Shaving Analysis of Power Demand Response Considering Unit Uncertainty
Authors: Cong Yunhua , Zuo Feng , Li Tongqing , Shen Miaozhao , Li Jin , Zhu Lei
Published: October 2022

With the increasingly prominent environmental problems and the promotion of the “double carbon” goal, the participation of demand-side response resources in load peak shaving and valley filling is of great significance to the development of the power industry. In this paper, based on the background that demand-side response is being rapidly developed in China, we firstly consider the uncertainty of generating units and the operating constraints of power system and units, and construct the day-ahead output model of generating units by using stochastic production simulation and day-ahead optimal scheduling. Then, based on this model, we consider the impact of demand response on system peak shaving and build a demand response power system optimal scheduling model with unit uncertainty. Finally, the power supply and demand of the IEEE30 node system on two typical days of peak shaving considering demand response are analysed by MATLAB, and the minimum service cost of demand response and the amount of pull-out limit are derived, which clarify the important role of demand response in the process of power system peak shaving.
A Resonant Cavity Based on Capacitively Loaded Coaxial Structure for Overhauser Magnetic Sensors
Authors: Liu Liping , Dong Haobin , Luo Wang , Ge Jian , Liu Huan
Published: October 2022

The RF excitation coil is an important component of the Overhauser magnetic sensor, which determines whether the dynamic nucleation polarization of the free radical solution can be carried out smoothly. A capacitance-loaded resonant cavity structure is proposed as the RF excitation of the Overhauser magnetic sensor. The structure and equivalent circuit of the capacitance-loaded coaxial resonant cavity are analyzed and improved on the conventional structure, and the resonant frequency is verified to be consistent with the excitation frequency of the free radical solution by modeling and simulation using COMSOL software. The resonant cavity solid was fabricated, and the cavity was tested by using a vector network analyzer. The results show that the initial resonance point of the homemade resonant cavity is 60.55MHz, and the frequency point can be adjusted to 60.7MHz by adjusting the loading capacitor and tuning capacitor; the resonant cavity return loss S11 is about -19dB, and the quality factor Q value is about 506.
Design and Research on Flapping Mechanism of Biomimetic Albatross
Authors: Zhang Haiming , Liu Zhenzhong
Published: October 2022

In order to solve the problems of low flying efficiency, poor aerodynamic performance of wing and short flying time distance existing in the research of flapping wing aircraft, a kind of albatron-like flapping wing structure with higher flying efficiency is proposed in this paper. The functions of bird wing flutter, folding and gliding are realized by two degrees of freedom control respectively. First, the flying characteristics of albatross are analyzed and the flying characteristics suitable for albatross are summarized. Propose design requirements for bionic design objectives; The bionic structure design is carried out by referring to the physical structure of wing and the flight motion law, and the key parameters such as the size and angle of connecting rod mechanism are analyzed, calculated and optimized. A clamping mechanism is designed to achieve gear stuck in order to achieve gliding kinetic energy. The three-dimensional model of the flapping wing mechanism is built by solid works, and the motion analysis is carried out by using Motion plug-in. The analysis results of key-point parameters are output, which verifies the movement law and requirements of the mechanism to achieve the design objectives.
Investigation of a tunnel magnetoresistance based vector magnetometer for magnetic anomaly detection
Authors: Wang Hongpeng , Yang Ruiping , Luo Wang , Ge Jian , Liu Huan , Dong Haobin
Published: October 2022

The development of high-performance and miniaturized magnetometers is important for small-scale target magnetic anomaly detection. In this work, a miniaturized three-axis vector magnetometer based on the tunnel magnetoresistance (TMR) technique is investigated for magnetic anomaly detection. First, the miniaturized three-axis TMR vector magnetometer is constructed, and then, the limit of detection tests and the magnetic anomaly detection tests are performed. The indoor experimental results show that the proposed magnetometer can capture the magnetic anomalies higher than 3.9 nT, with the low-frequency equivalent magnetic noise of 46.89 pT/√Hz@1Hz. The outdoor experimental results show that the proposed magnetometer can effectively detect small-scale magnetic targets such as hammers at a distance of about 1.5 m. With the advantages of small size, low power consumption, and high magnetic measurement sensitivity, the TMR magnetometer has great application prospects for long-term magnetic anomaly monitoring, high-density magnetic imaging, and other fields.
Design and Simulation of an O-type 3-position-4-way Directional Valve with Zero Leakage in the Mid-position
Authors: Mao Xuyao , Wu Zhengjiang , Qian Yuan , Zeng Baoping , Liu Yiou
Published: October 2022

An O-type 3-position-4-way directional valve based on a pilot K-type spool valve and four B-type cartridge units with almost zero leakage in the mid-position is designed. Compared with an O-type3-position-4-way directional valve with an ordinary spool structure, under the same design requirements of nominal diameter, clearances, external load, etc., the mid-position leakage of the new valve is greatly reduced to nearly zero, that is, the new valve has excellent mid-position retention performance. The influence of fitting clearances between the pilot valve spool and valve sleeve (including uneven clearances), friction and check valve cracking pressure, etc. on the performance of the valve are analysed, and the results show that the factors mentioned above within reasonable values would hardly affect the mid-position retention performance of this new directional valve, and the occurrences of “crawling” and other phenomena could be reduced to a certain extent at the same time.
Analysis on affecting factors of the ribbon fluctuation in Array-MRF
Authors: Tie Guipeng , Wang Bo , Shi Feng , Song Ci , Tian Ye
Published: October 2022

Large aperture planar optical elements are required in high power laser systems, and the mid-spatial frequency error of the surface of the high-power laser component will affect the normal operation of the high-power laser system. In recent years, there are many new MRF devices, but these devices only improve the removal efficiency of polishing materials and ignore the stability of MRF tools. As we all know, the fluctuation of the MRF polishing ribbon will affect the stability of the removal function, which will make the surface of the processed component produce the mid-spatial frequency error. Therefore, based on the array magnetorheological pole structure newly developed in our laboratory, this paper tests its magnetic field distribution and studies the influencing factors of array magnetorheological ribbon fluctuation. Based on the magnetic field force, the effects of magnetorheological fluid flow, polishing wheel speed, and magnetic pole structure on ribbon fluctuation are analyzed. Finally, by using the improved array magnetorheological device to obtain a stable removal function, the volume removal efficiency of fused silica reaches 0.022mm3/min, which verifies the feasibility of the improved device and doubles the removal efficiency of magnetorheological finishing of a single ribbon. Therefore, we use controlled magnetorheological processing flow and speed to control ribbon fluctuations and designing the magnetic pole structure, to control the stability of magnetorheological processing.
Experimental study on the nonlinear dynamic characteristics of a kind of hinged connection structure
Authors: Shi Qingping , Zhao Xueyan , Si Bingquan , Zhang Haiyu
Published: October 2022

The hinged connections are widely used in mechanical structures, such as the expandable structures and truss structures in spacecraft and the three-point hitch device in agricultural machinery. The hinged connections allow relative rotations between the connected members so that the positions of mechanical structures can be adjusted. Thus, the hinged connections are always subject to large and complex forces during working operation, and these will lead to complicated nonlinear vibrations which have a significant impact on the working performance and fatigue lifespan of the mechanical structures. Therefore, the nonlinear dynamics characteristics of the hinged connection are studied. Firstly, the experimental platform of a typical hinged connection is established according to the mechanical structure characteristics and loading features of the hinged connection structure. Then the vibration experiments of the hinged connection structure are carried out respectively under different working conditions. Finally, the effect of hinge clearances and excitation frequencies on the nonlinear dynamics of the hinge connection structure is studied by the vibration response of the hinge connection structure under different working conditions. The results of this study can provide a reference for the optimal design of the hinged connection structure.
Effect of crack on dynamic characteristics of corn combine harvester frame
Authors: Si Bingquan , Zhao Xueyan , Zhang Haiyu , Shi Qingping , Wang Shilong
Published: October 2022

The frame is an integral part of the corn harvester and is the mounting carrier for all components, so a high strength frame structure is a basic requirement for a high level corn harvester. Corn harvesters often operate in harsh conditions on farmland and have a high intensity of concentrated operating hours. This often leads to fatigue cracks in the frame, which can affect the operational life of the harvester seriously and even result in accidents. Therefore the vibration characteristics of the frame structure of corn harvesters with cracks need to be investigated. Firstly, the typical experimental platform of the frame structure of the corn harvester with cracks is established, according to the structural characteristics and force situation of the frame of the corn harvester during operation. Then, the vibration characteristics of the frame with cracks in the longitudinal beam and the frame with cracks in the crossbeam were subject to different excitation frequencies and excitation amplitudes. Finally, the effects of crack location, excitation frequency and excitation amplitude on the vibration characteristics of the harvester frame structure were investigated by analyzing the time domain and frequency domain plots of the experimental results of the frame vibration characteristics under various conditions. The results of the study can provide reference for frame structure fault diagnosis and fault localization.
Simulation of the effect of EGR rates on combustion and emission of a diesel engine
Authors: Feng Shiquan , Zhong Xing , Wu Shi
Published: October 2022

This paper constructed a reduced combustion mechanism for diesel to build a three-dimensional model of the in-cylinder combustion of a diesel engine, analyzes the changes of in-cylinder pressure and temperature under different EGR rates, draws the three-dimensional spatial distribution of in-cylinder temperature.
Interfacial Stress Analysis of PVD Thin Film Sensor Based on Finite Element
Authors: Zhou Yiming , Cui Ronghong , Song Yujian , Fan Xianghong , Zhu Jian
Published: October 2022

The ability to monitor fractures is based on the integration of PVD thin film sensors and substrates, and the interface stress distribution of the sensor under load which directly impacts the bonding performance. This research analyzes the impact of film elastic modulus and thickness on film-substrate interface stress using the Abaqus software to investigate the influence of PVD film sensor material properties on the film/substrate interface stress distribution. The higher the concentration of interfacial tension, the thicker the layer. The sensor's structural parameters were optimized and significantly enhanced crack detecting sensitivity. The results reveal that the PVD film sensor material can detect structural defects efficiently. The conclusions established in this work have some implications for the optimal design of PVD thin film sensors.
Observation of Distinct Structural Phase Transition in Bulk CrI3 Magnet
Authors: Zhen Liu , Bo Peng
Published: October 2022

Exploring structural phase is not only vital for fundamental physical properties, but also crucial for creating innovative devices. The emerging two-dimensional (2D) ferromagnet CrI3 has been widely studied because of its novel magnetic order, stacking order and related properties. Conventionally, it is predicted that the high-temperature monoclinic crystal phase will convert into low-temperature rhombohedral crystal phase in bulk CrI3 at a critical temperature of ~ 220 K. Strikingly, here, a high-temperature monoclinic phase in bulk CrI3 flake is completely preserved upon cooling from 295 to 10 K beyond the conventional phase changes, breaking out the regular cognition. This work indicates that complex structural phases coexist in bulk CrI3 ferromagnet, which are attributed to the difference between the surface and inner layers. These findings not only deepen the understanding of 2D ferromagnetic materials, but also provide opportunities for constructing future 2D-based magneto-optic and magneto-mechanical devices.
Discussion on the Causes of Cracking and Failure of Anticorrosion Layer of a Pipeline
Authors: Zhixin Chen , Xiang Zhang , Shen Cong , Quan Jin
Published: October 2022

The cause of a rare cracking failure accident of the polyethylene (PE) anti-corrosion layers of a pipeline is analyzed and determined. The properties of the PE raw materials and the anti-corrosion layers were detected and analyzed according to the standard, and the micro-morphology of the anti-corrosion layers was characterized by the scanning electron microscope (SEM). The storage modulus and loss of the anti-corrosion layers at the range of -100~40 °C were tested by the dynamic mechanical analysis (DMA), and the stress of the anti-corrosion layers at low temperature (-40 °C) was calculated. The average thermal expansion coefficient of the anti-corrosion layers in the range of -40~60 °C was tested by the thermomechanical analysis (TMA), and the value at room temperature was obtained, which was compared with the value of the steel materials. The failure accidents caused by raw materials and anti-corrosion layers due to the quality problems, as well as aging and damage of anti-corrosion layers are excluded. The SEM results confirmed that the anti-corrosion layers with no obvious large-scale defects, there were microscopic defects less than 1 μm. At the low temperature (-40 °C), the storage modulus of the anti-corrosion layers is 2.58 GPa, and the corresponding stress is 23.99 MPa, which is higher than the tensile strength test value (22.21 MPa). The average thermal expansion coefficient of the anti-corrosion layers is 14.3×10-5/°C, which is higher than that of the steel material (1.2×10-5/°C). The high stress at low temperature (-40 °C) is one of the reasons for induced defects to cause cracks, and the huge difference in thermal expansion coefficient between the anti-corrosion layers and the steel material is another reason for that.
A UAV swarm communication network architecture based on consortium blockchain
Authors: Han Yu , Wang Xiaolei , Zhang Yi , Yang Gang , Tan Xin
Published: October 2022

In the context of the development of UAVs towards clustering, intelligence, and autonomy, it is necessary to ensure that multiple UAVs and ground control stations can communicate and share information securely in real-time so that UAV swarms can make real-time and effective decisions and collaborations. These factors pose challenges to the security, robustness, and operational efficiency of UAV swarm communication networks. This paper combines blockchain technology with a UAV swarm communication network, proposes a new UAV swarm communication network architecture based on consortium blockchain, and describes the network structure and transaction process in detail. The performance analysis shows that the security mechanism of the architecture can meet the security requirements of the UAV swarm communication network. And this solution is superior to existing solutions based on blockchain technology such as Ethereum in performance and is a technical solution with both security and usability.
Charging Station Planning of Electric Vehicle in Battery Swapping Scene
Authors: Shangguan Zizhuo , Qi Dongfeng
Published: October 2022

In response to the national green development concept, the electric vehicles quantity continues to surge. However, the cost of electric vehicle charging facilities is hindering the development of electric vehicles. Considering charging facility cost and fuel consumption cost of logistics vehicles, we propose the charging planning for electric vehicle batteries. First, according to the user’s mileage, we simulate the maximum demand for electric vehicle batteries in each time. Then, based on the electric vehicle battery charging planning, we establish an optimization model for the number of battery charging equipment and the fuel consumption cost of logistics vehicles. Finally, through specific examples we show the optimal number of delivery is 4 from the battery charging station to the battery swapping station. The battery charging equipment are 368 units and the fuel consumption cost of the logistics vehicle is 8040 RMB per day. In addition, the number of logistics vehicle departures is reduced by 3 compared to the same amount of delivery, which significantly improves the stability and efficiency of the battery swapping scene.
Design of output filter device of mine-used high-voltage inverter for long-distance power supply
Authors: Wang Yue
Published: October 2022

During the long-distance transmission of the Pulse width modulation ( PWM ) signal of the mine-used inverter, the voltage reflection phenomenon leads to a higher peak voltage at the motor end, which accelerates the insulation aging of the motor and reduces the overall reliability of the system. In this paper, ANSYS is used to simulate the electromagnetic field of cable and cable connector and extract the distributed parameters. On this basis, the simulation model of long-distance power supply system of 3300V mine-used high-voltage inverter is established by MATLAB / Simulink, and the harm caused by peak voltage to motor is analyzed. According to the cable length, the number of cable connectors and the power loss of the device, a design scheme of LRC filter device meeting the power supply distance of 3000m is proposed. Simulation and experimental results verify the effectiveness of the filter device.
Optimal Dispatch of Multi-energy System Based on Carbon Trading Auxiliary Service
Authors: LI Zhengxi , AN Na , Liu Tingxiang , Wang Gangfei , Qin Lidong , MA Hengrui
Published: October 2022

The energy economy, flexibility and low carbon of multi-energy system is one of the research hotspots of multi-energy system, a comprehensive energy system optimization scheduling method considering carbon trading is proposed. On the basis of considering the dynamic output of heat network equipment, an optimal dispatch model of the integrated energy system is constructed through energy coupling equipment such as cogeneration units, heat pumps, and gas turbines. Firstly, the thermal dynamics of heating pipes and heating buildings are modeled in detail. Then, taking the lowest operating cost of the integrated energy system and the lowest carbon transaction cost as the objective function, and taking the energy balance constraints and network constraints as the constraints, a day-ahead optimal scheduling scheme of the integrated energy system is proposed. Finally, the simulation results show that the multi-energy optimal scheduling method can effectively reduce the expenditure of the multi-energy system, increase the penetration ratio of wind and solar power generation, and reduce the overall carbon emissions of the system.
The Potency of Karamunting Borneo Plants From Weeds Into Herbs
Authors: Jumiati E , Ismandari T , Amarullah  , Willem
Published: October 2022

Indonesia has a very high potential for biodiversity, both flora and fauna so that Indonesia is also known as a mega-biodiversity country. The use of certain types of plants is carried out by the community, one of which is for treatment and is usually inherited from generation to generation. Traditional medicine is the basis of modern medicine, in developed countries there are more traditional and herbal medicines than synthetic ones. One of the flora that has potential as a medicinal plant is karamunting. Karamunting plants are often found as weeds, both in yards and fields, even on marginal lands. The research method used was survey and laboratory methods. The ethnobotanical aspect of the karamunting plant, the community used some parts of the karamunting plant as medicine. The ecological aspect of the Karamunting plant has a fairly high life potential with a density level of 1.81 trees/m2 with a clustered distribution pattern. Meanwhile, from the phytochemical aspect, the karamunting plant has the potential as a medicinal plant containing flavonoid compounds, alkaloids, steroids and saponins found in the roots, stems, leaves, flowers and fruits that function to prevent and cure various diseases.
Ichtyofauna in Kayan Watershield Bulungan Regency, North Kalimantan
Authors: Jabarsyah Abdul , Rahmawani Dori , Taqwa Amrullah , Simanjuntak Ricky Febrinaldy
Published: October 2022

The Kayan River is the longest in North Kalimantan, inhabited by various types of aquatic biota. However, in recent times there have been established multi-national oil palm plantations and mining around the Kayan River which will have an impact on the Kayan River ecosystem. The aim of this study is to determine the ecological status of the Kayan River based on current conditions. Fish sampling is carried out along the Kayan River starting from the upper reaches of the Bahau River to the downstream. Identification of fish is based on the Fishbase Organization, FAO and Kottelat. Measurement of water discharge using the SNI 8066: 2015 method, Total Suspended Solid refers to SNI 06-6989.3-2004. Determination of species diversity using the Shannon-Wiener Index, while the measurement of dominance index uses the Simson Index. The results obtained 37 species from 16 families during the 2019-2020. The family of Cyprinidae is the largest fund with 32%. Among the 37 species found 9 native species of Kalimantan, 3 invasive species, 1 species of saltwater fish, and 2 species of fish are included in the IUCN red list. Fish that are included in the endemic/native category of the Kayan River are Anguilla borneensis, Hemibagrus capitulum, Nematabramis alettes borneensis, Clupeoides borneensis and Osphrenemus septemfaciatus, and Pangasius rheophilus. Based on the results of the study, it can be concluded that the ecological status of the Kayan River fish is still considered very good and stable during the research period.
The Effect of Shrimp Waste Fertilizer Application on Spinach (Amaranthus tricolor L.) with the Presence of Weeds
Authors: Murtilaksono A , Septiawan R A , Hasanah F , Adiwena M
Published: October 2022

The presence of weeds in spinach cultivation land is strongly influenced by the application of fertilizer. Fertilizer has a different content so that it will have an impact on the weed species growth. Identification in this study aims to determine the types of weed species that grow and the dominant types of weed species that grow on spinach cultivation land before and after the application of shrimp waste fertilizer. This research was conducted from June to August 2021, on horticultural crop cultivation in the Sinar Harapan Farmers Group, Tarakan City. The sampling method was a random method using a square plot method with a size of 1 x 1 m as many as 30 samples before and after the application of shrimp waste fertilizer. Observation parameters are counting the number of weed species and the name of the weed species. The data obtained in the field is then processed to determine the level of density, frequency, significant value index (INP), Summed Dominance Ratio (SDR), Margalef Index, Shanon-Wiener Index, Evennes Index and Sorensen Index. The results showed that the weed species before the application of shrimp waste fertilizer on spinach plants were 27 species with the dominant weed species being Cyperus compressus with a Summed Dominance Ratio value of 22.72%. Weed species before the application of shrimp waste fertilizer on spinach plants were 25 species with the dominant weed species namely Cyperus compressus with a Summed Dominance Ratio value of 20.51%. The Margalef index before the application of shrimp waste fertilizer was 3.20 and after the application of shrimp waste fertilizer was 3.05. The Shanon-Wiener index before the application of shrimp waste fertilizer was 2.60 and after the application of shrimp waste fertilizer was 2.40. Evennes index before the application of shrimp waste fertilizer is 0.79 and after the application of shrimp waste fertilizer is 0.74 and the Sorensen index is 85%
Natural Enemies of Pest in Rice Cultivation of Sesayap Watershed Area, Tana Tidung Regency
Authors: Rahim Abdul , Rahmawandi Yudi , Nurmaisah  , Adiwena Muh , Haka Paolus Donatus , Setiawan Anggun
Published: October 2022

Study of potency natural enemies are base for utilization as a natural control of pests. This study was determined the main of natural enemies on rice cultivation in several site in Sesayap watershed area, especially Tana Tidung Regency. The study sites were collected in Tideng Pale, Gunawan, Sesayap Hilir, Rian, and Tana Merah. Each site was sampled at 5 points using traps, sweep net, and yellow pan traps. The results showed insect group consisted of 32 families, 44 genera, 44 species and 836 individuals. The Araneae group were consisted of 11 families, 12 genera, 13 species and 347 individual species. Insect predatory have highest number which were Dolichoderus taschenbergi (24.7%), Chlaenius nigricans (19.9%), and Anoplolepis gracilipes (17.8%). The Shanon-Wiener species richness and diversity index, and the evenness index in Rian (R=5.93; H’=2.77; E=0.79), Bandan Bikis (R=3.63; H’=2.16; E=0.75), Tana Merah (R=6.48; H’=2.16; E=0.62), Tideng Pale (R=6.48; H’=2.90; E=0.79), and Gunawan (R=5.86; H’=2.73; E=0.76) respectively. The Tideng Pale and Rian have the highest similarity index (67%), while the lowest index at the Tana Merah and Tideng Pale sites (44%). Natural enemies of predators tended relationship with Gunawan and Rian site. Meanwhile, site of Bandan Bikis tended relationship for enemies of parasitoids. Based on these results, the Sesayap watershed of Tana Tidung Regency has a high species richness, but the diversity is classified as moderate. Thus, it is necessary to make efforts to conserve natural enemies of pests in the Sesayap watershed area, Tana Tidung Regency.
Effect of temperature and relative humidity on the respiration rate of coated banana (Musa acuminata)
Authors: Kasim Rahmiyati , Bintoro N , Rahayoe S , Pranoto Y
Published: October 2022

The respiration rate of fruits is influenced by the temperature and relative humidity (RH) of the surrounding air. This research aims to determine the effect of storage air temperature and RH on the respiration rate of the coated banana. In this work, the bananas were coated with a combination of sago starch and cellulose nanofiber then was measured the respiration rate. The respiration rate was investigated using a closed system at three different temperatures namely 10°C, 17.5°, and 27°C, and three levels of RH that are about 70%, 80%, and 90% during 10 days of storage. Changes in oxygen and carbon dioxide concentrations were measured daily. The respiration rates of the coated banana (O2 consumption (RO2) and CO2 production (RCO2)) and the RQ value was influenced by storage time, storage temperature, and the interaction of those two factors. RH was found to have no significant effect on these three parameters. The Arrhenius equation was found to be suitable for the RO2 and RCO2 model and can be used to predict RO2 or RCO2 of the coated banana under real conditions for RH ranging from 70% to 90% and storage temperature ranging from 10°C to 27°C.
Response Characteristics of Sensor Array of Fresh Meat Detection Circuit using Conducting Polymer Sensor
Authors: Simanjuntak Benrad Edwin , Situmorang Marhaposan , Humaidi Syahrul , Sinambela Marzuki
Published: October 2022

Consumption of meat is needed by society. The meat needed is of course fresh and quality meat. However, the quality of meat sold in the community varies greatly. Fresh and quality meat is meat that is odorless, not slimy, does not change color in certain areas. Meat that is not fresh and not of good quality is smelly meat. The odor is described as a fishy smell, a foul smell, contains sulfur and smells like ammonia. Because it is dangerous to consume rotten meat, it is necessary to have an automatic meat detection device so that it can ensure the meat is fresh and of good quality. This tool replaces the human nose with an odor sensor as a bad smell detector.