bluuebunny/crossref_metadata_2025 huggingface dataset:
RETRACTED: Deep Learning-Based Clinical Image Segmentation Methods With Different Modalities
Authors: Jain Dhyanendra , Singh Prashant , Bharti P.K.
Published: April 2022

This paper provides a evaluation of the furnished strategies for classifying picture of brain lump the Nuclear-MRI (MRI) and the computed tomography (CT) scanning. The separation of MRI picture of the mind and CT are extensively used as preoperative imaging, in-affected person studies and with inside the use of equipment, within side the area of scientific imaging processing. Separation of MRI and CT picture is a tough venture due to the similarities among the robust and tender institution of muscle anatomy with inside the mind photo. And many components of the identical area within side the image are separated via way of means of the separation of the photo and the direction. Selection of the ideal phase kind constructed at the photo element. This evaluation changed into carried out with the purpose of authorizing a mixture of kind separation of MRI and CT picture. These opinions are classified primarily based totally at the strategies taken into consideration for classification.

imaging of MRI & CT also known as X-ray. The separation of MRI picture of the mind and X-ray are extensively used as preoperative imaging, in-affected person studies and withinside the use of equipment, withinside the area of scientific imaging processing. Separation of MRI and CT picture is a tough venture due to the similarities among the robust and tender institution of muscle anatomy withinside the mind photo. And many components of the identical area withinside the image are separated via way of means of the separation of the photo and the direction. Selection of the ideal phase kind constructed at the photo element. This evaluation changed into carried out with the purpose of authorizing a mixture of kind separation of MRI and CT picture. These opinions are classified primarily based totally at the strategies taken into consideration for classification.
Investigation of Electric Field Profile and associated parameters with Embedded Metal Layer in Field Plate AlGaN/GaN HEMTs
Authors: Bordoloi Sushanta , Ray Ashok , Barman Pranjal , Trivedi Gaurav
Published: April 2022

Electric field initiates various failure mechanism in an III-N based AlGaN/GaN HEMTs. The material properties of the GaN-HEMTs under the influence of electric field activates physical mechanisms like converse piezoelectric effect (CPE), crack/defect migration, trapping, which deteriorate the electrical behaviour of the device leading to permanent failure. The drain side of the gate edge has the highest electric field and is the hub of all the reliability concerns in a GaN HEMT, which is mitigated with field plate (FP) technology. However, the FP edge is now subjected to these degradation phenomena. The present work aims at suppressing the strong electric fields at the FP gate edge using an embedded metal layer that shields the electric field from reaching the gate edge. Calibrated numerical simulations have been carried out on the proposed device structure to observe the viability in consideration. It is found that the electric field at the FP edge reduces by around 3%. Also, CPE and electron temperature reduce by 20%, and 14%, respectively. Since the proposed device structure can considerably mitigate the electric field, CPE, and electron temperature, it is expected that it will pave a path for improved and reliable devices in the future.
Combination of Auto-encoder architecture and super resolution for better segmentation of thinned and cursive handwritten documents
Authors: MP Ayyoob. , Ilyas.P Muhamed
Published: April 2022

In neural networks an auto-encoder architecture has several applications such as image denoising, feature reduction, data compression, image colorization, dimensanality reduction, segmentation and so on. Super-resolution is used to upgrade the low resolution images into high resolution. In order to get a better result on segmentation of thinned hand written images, this paper proposes a method of combination of associative auto-encoder architecture and super resolution for pixel expansion.

Experimental results show that the combination of proposed network and super resolution method accurately segments the thinned handwritten Arabic words.
Throughput Analysis of α-κ-µ Extreme/Gamma Composite Fading Channel
Authors: Kumar Rajesh , Yadav Poonam , Kumar Sandeep
Published: April 2022

In this paper, we consider α-κ-µ-Extreme/gamma composite fading channel model, which is used to characterize non-linear severe fading and shadowing impairments in enclosed wireless propagation scenarios. For this model, we first obtain the probability density function (PDF) expression for the received signal-to-noise ratio(SNR). Using the derived PDF, throughput analysis is provided by deriving expressions for the average channel capacity(ACC) and effective capacity(EC) in closed-form. The derived expressions are evaluated for several values of fading and shadowing indexes to study their effect on the ACC and EC. Furthermore, asymptotic analysis of ACC and EC are carried out to show better approximation under the high and low SNR regimes.
Printed monopole antenna design with CPW fed for ultra wideband application
Authors: Singh Samom Jayananda , Kumar Rajesh , Dixit M M
Published: April 2022

A circular monopole antenna fed by co-planar waveguide(CPW) for ultra wideband application is described in this article. The usage of a co-planar ground plane help to increase bandwidth for a frequency range 5G frequency spectrum’s mid band. The proposed antenna is designed to operate from 4.8GHz to 14.10GHz. With this proposed antenna, a suitable omnidirectional radiation pattern can be created. Comparison of fractional bandwidth value for various gap between the ground plane and the patch for satisfying the criteria for UWB has been analysed here.
The Second Harmonic Effect of Fractional-order Azimuthally Varying Vector Optical Field
Authors: Zhao Xu
Published: April 2022

We report for the first time the second-harmonic generation (SHG) of a fractional-order azimuthal varying vector optical field (FO-AVVOF). SHG process is achieved by a Type-II phase-matching BBO crystal. This nonlinear frequency conversion process reveals the topology multiplication rule and obtains the second harmonic optical field of the ultraviolet wavelength, which may have potential applications in ultraviolet micromachining and all-optical switching.
Influence of Excitation Signal Type and Period Selection on Detection Capability of TEM System
Authors: Yang Longcheng , Wang Huajun , Liu Jicheng , Kuang Yin , Wei Juan , Wang Xiaofei
Published: April 2022

The type and period of excitation signal are the important technical indexes of TEM system detection, which have an important influence on the detection accuracy and detection depth of the system. In this paper, by simulating the magnetic field distribution characteristics and magnetic focusing effects of transmitting coils with different excitation signals at the same depth, the differences of excitation signal types are analyzed and studied. Then, the echo effect diagram of receiving coils and the change curve of magnetic flux at the equivalent depth are simulated under different periods to determine the minimum period of excitation signal by comparative analysis. The simulation results show that the focusing and propagation depth of the magnetic field energy generated by the excitation signal are better when the rectangular pulse is selected and its period is determined to be 500 ms. Experimental tests under different thickness of steel plate show that the induced voltage on the receiving coil is different with different thickness. The thicker the ferromagnetic material is, the smaller the peak value of echo signal is. Moreover, in the case of no ferromagnetic material model, the induced voltage of the receiving coil is the maximum. This provides a theoretical basis for evaluating the corrosion of buried metal pipes by transient electromagnetic detection system.
Research on Calibration Method for On-line Radiation Monitoring of γ-ray Source
Authors: Shang Yu , Zhang Ruidan , Ma Ying
Published: April 2022

In the on-line radiation monitoring of γ -ray source, the active online monitoring module can realize real-time recording of the radiation dose equivalent value and count rate in the detector. Because the amount of radiation at different measuring points is different, their values vary from place to place, so there is no exact value that is completely suitable for all kinds of measurement situations, so the nonlinear relationship between counting rate and dose rate is deduced. For the difference of the dose at the measuring point, the relationship between them will increase with the continuous accumulation of radiation dose, which will have an impact on the iterative algorithm. In this paper, the LM algorithm is used to solve the fitting function model, and the feasibility of the algorithm is verified by MATLAB software programming. The results show that the parameters of the objective function model can be obtained by the LM algorithm, and the relative error of the eighth polynomial can be minimized and a better fitting effect can be achieved.
Ti3C2Tx MXene Decorated Textiles with Low Thermal Emissivity
Authors: Wang Wenjuan , Zhu Yining , Ghosh Pintu , Li Qiang
Published: April 2022

Generally, commercial textiles show high mid-infrared emissivity and the thermal radiation accounts around 50% of the heat loss. However, conventional clothes usually increase the thickness to reduce the heat conduction without considering lowering the mid-IR emissivity. Thus textiles with reducing infrared emissivity for passive radiative heating offer an energy-free way to keep human body warm. Herein, we reduced mid-IR emissivity of the textiles by covering Ti3C2Tx MXene sheet on the cotton fabric through dip coating. MXenes as a new family of two-dimensional (2D) materials shows strong absorption in visible and near-IR regions and strong reflection in mid-IR region. Through simple and scalable method of dip coating, we fabricate four samples with different MXene content from 0.05 mg/cm2 to 0.20 mg/cm2 with 0.277∼0.431 mid-IR emissivity. This material and preparation method can be used for personal thermal management on traditional clothing.
Research and Design of Etching Line about Nuclear Track Membrane
Authors: Li Yunjie , Mo Dan , Duan Jinglai , Yao Huijun
Published: April 2022

Nuclear track membrane is a new type of membrane material with uniform pore size distribution. It can be used as a high-precision filtration membrane and there is a wide range of applications in sewage treatment, cell filtration, and biomedicine. The main production processes of nuclear track membrane include heavy ion irradiation and chemical etching, so there is a great significance about the research and design of etching lines. The main contents studied in this paper include the physical design principle of the etched line, the basic engineering structure, the basic control system architecture, and a complete HMI. The research plays an important role in the development and large-scale application of nuclear track membrane in this paper.
Study on the Simulation and Experiment of Ultrasonic-assisted Vibration Drilling of Ti6Al4V
Authors: Li Yan , Yang Yi , Wang Yan , Gao Feng
Published: April 2022

Titanium alloy is a typical difficult-to-cut material used in most industrial fields, so its machinability is characterized by low efficiency and poor quality using Conventional Drilling (CD). To address this issue in drilling workpiece of Ti6Al4V the ultrasonic vibration with high-frequency and low-amplitude is applied in the feeding direction of drill bit. Based on Johnson-cook constitutive model of workpiece material, a 3D FEM cutting simulation is conducted to analyse the variation trend of thrust force and the formation of hole burr under different processing parameters. The simulation and experimental results demonstrate that the ultrasonic vibration can convert continuous cutting into periodical intermittent cutting, which is helpful to break chip and deburr as well as enhance inner wall quality of hole significantly. Moreover, ultrasonic assisted drilling decreases the thrust force, improves the rigidity of the cutting tool in the process of drilling and facilitates removing the workpiece material. Therefore, the ultrasonic vibration can effectively promote the drilling quality of titanium alloys Ti6Al4V compared with CD.
Research on Self-melting Snow Material of Asphalt Pavement
Authors: Zhang Yongli , Wang Xiaosen , Meng Huilin
Published: April 2022

The effects of pozzolan and calcium chloride on the performance of asphalt mixtures were analyzed by laboratory performance tests. Using the maximum bulk density of mixed materials after vibration compaction, Determined the reasonable ratio of calcium chloride to fill the voids of pozzolanic material. The amount of surface modified material was determined based on the precipitation rate of the melting snow component and the effect on asphalt performance under cyclic water immersion conditions. Tested the performance of the asphalt mixture, self-melting snow material can improve the low temperature performance of the mixture. There is a certain reduction in high temperature performance and water stability, but all meet the requirements of normative indicators.
Temperature Field Simulation and Analysis of Connector for Power Battery
Authors: Jin Biao , Fei Qiang , Zhang Tong , Wang Ying-shun , Zou Wuyuan
Published: April 2022

It’s very important to make use of finite element analysis software to assist the structure design of power battery connector. In this paper, Ansys workbench was used to establish the electric-thermal coupling model of finite element simulation for the connector assembly, and the temperature field simulation calculation and analysis were carried out for the connectors of different thickness under the condition of high current. The results show that the maximum temperature of the connector increases with the decrease of its cross-section thickness, and the higher the current is, the longer the power time will be, the higher the temperature will be. In addition, the connector with thickness of 0.8 mm has the risk of fusing under the action of 500 A current.
Design and Test of Natural Gas Diesel Dual Fuel Engine Based on SolidWorks
Authors: Fei Qiang , Jin Biao
Published: April 2022

Taking ZS1115 diesel engine as an example, on the basis of basically not changing the original structure, natural gas inlet valve, natural gas air mixer and natural gas governor are added to realize dual fuel combustion control. The model of dual fuel engine is established by using SolidWorks software, and the size and performance parameters of main mechanical structures are optimized and simulated by using modules such as simulationmotion, simulationxpress and simulationflow. The bench test results show that the dual fuel engine designed based on SolidWorks runs stably, and the power, economy and emission performance meet the design requirements.
Design and Motion Simulation Analysis of a Novel 2D Bionic Flutter Aircraft
Authors: Wang Yaoyi , Sun Ye , Jiang Shaoqi , Li Wenbo
Published: April 2022

In order to improve the symmetry of the flutter mechanism in the bionic flutter aircraft, and then improve the overall motion stability of the flutter aircraft. In this paper, an innovative flutter wing configuration is designed based on a planar crank-slider mechanism and a sparrow model. The geometric relationship of the flutter mechanism is established, the motion of the flutter aircraft is modeled, and the dimensions of the model are optimized. The geometric relationship of the flutter structure was simulated and analyzed by CATIA. The results show that the upper limit angle of the designed flutter structure is βmax=25.82° and the lower limit angle is βmin=6.34°. The CATIA simulation data are consistent with the theoretical values of the established structural geometry model. Meeting the needs of small and medium-sized flutter aircraft.The design provides a theoretical basis for the design and development of the bionic flutter vehicle and the fabrication of a solid prototype.
Infrared Small Target Detection Algorithm Based on Local Spatial Gradient Peak
Authors: Yan Zujing , Xi Peiyao , Luo Man , Xin Yunhong
Published: April 2022

A sparse infrared small target detection algorithm based on local spatial gradient peaks is proposed to deal with the problem of slow running speed and edge sensitivity in low-rank decomposition methods.The detection steps are as follows. In the first step, the image expansion operation is used for preprocessing. We use the circular structure element to sharpen the edges of targets and smooth the background noise. Then, the saliency gradient features of the target local region are applied to calculate the overlapping gradient information of the image after expansion. The local area with a larger gradient peak is located in the original image, and the selected local area is considered to be the region of interest with candidate targets. Finally, we use the advanced accelerated proximal gradient algorithm to perform matrix decomposition in the extracted local regions of interest to extract sparse infrared small targets. Extensive experimental results under real scenarios illustrated that compared with the baseline low-rank sparse decomposition method, the proposed approach runs faster and shows superior detection performance in the comprehensive evaluation index.
Simulation of Electromagnetic Radiation Environmental Impact of 5G Application Base Station
Authors: Gong Yuan , Chi Qin , Liu Qinxin , Pan Chan , He Mu
Published: April 2022

Based on the understanding of the radiation impact of 5G application base station construction on the environment, this paper simulated the electromagnetic radiation level of the environment after 5G application base station construction by establishing three numerical models. The study found that the prediction model based on population and mobile phone traffic characteristics can be used to predict the radiation environment of the whole region on the premise that 5G communication has been widely used by people, and this model is also suitable for the prediction and simulation of 3G/4G radiation environment.
Optimization of Power Cable Layout Scheme for Point Absorption Wave Energy Converters
Authors: Han Guoxin , Bao Xingxian
Published: April 2022

This paper studies the power cable of the point absorption wave energy converters (WECs). As bearing the cyclic loads induced by WECs motion, waves and ocean currents, cable is prone to damage and failure. Therefore, it is necessary to optimize the design of the power cable to improve its performances and ensure the service safety of the WECs system. The idea of setting buoyancy modules on different positions of the power cable is proposed in this paper. The length and weight of the power cable and the length and position of buoyancy modules are considered to optimize the design of the power cable in the numerical simulation. The optimal design is evaluated based on the maximum effective tension and curvature of the power cable and the captured power of the WEC. The schemes of the cable with buoyancy modules and without buoyancy modules are compared based on the maximum effective tension and curvature of the power cable and the captured power of the WEC. The results show that the cable performance is significantly improved after setting the buoyancy modules, but the improvement for the captured power of the WEC is little.
Modeling and Simulation Analysis of the Rhombic Car based on 3-DOF Handling Model
Authors: Zhang Yi , Zou Xiaomao , Gong Yu
Published: April 2022

A three degree of freedom(3-DOF) mathematical model of the handling and stability of the rhombic car is established in order to study the dynamic performance of the rhombic car. The dynamic performance of the rhombic car under different working conditions is obtained by the simulation analysis of the model. Through the road test of the rhombic car, the correctness of the mathematical model of the handling and stability is verified. Through the comparison between experimental data and simulation data, the maximum error is about 9.3%. Therefore, the mathematical model is correct. The 3-DOF model of the rhombic car can be used for research and optimization, which has good practical significance to the engineering.
Application of Modern Acoustic Technology and Acoustic Emission Equipment in Rock Mechanics
Authors: Zhao Congcong , Zhou Zilong , Huang Yinghua , Liu Chang
Published: April 2022

The development of modern physics has promoted the progress of traditional rock physics and mechanics, especially Sheng emission technology based on acoustics. In order to study the acoustic characteristics of rock specimens under compression, the test is carried out with the help of Sheng emission technology, the mechanical characteristic parameters of rock physics and mechanics are measured, and the sound source position and radiation energy parameters of rock fracture are obtained. Combined with the numerical simulation software MATLAB and fractal theory, the energy release mechanism of rock samples is analyzed. The acoustic characteristics of rock samples are remarkable, and the three-dimensional spatial coordinates of rock fracture source can be measured scientifically and accurately, with an accuracy of 99.98%, making it possible to reproduce the three-dimensional fracture source. It is found that the distribution of main fracture sources and high-energy fracture sources can be one-to-one corresponding and consistent with the external fracture failure mode of rock; Through interpolation inversion and energy parameter simulation analysis, slice processing is carried out to obtain the inversion results of energy distribution and test pieces. The process of microcrack propagation and propagation is completely consistent. Based on the analysis of physical mechanics and acoustic characteristics: the numerical simulation analysis of rock specimen failure process can not only reflect the dynamic failure process of rock, but also provide guidance for the prediction and analysis of mine disaster evolution.
Analysis of Optimal Parameters for Discriminating Cavitation Types by SSAE-RF
Authors: Kang Ziyang , Liu Zhiliang
Published: April 2022

Hydro power has many advantages, such as pollution-free, relatively mature technology and high security. Hydro turbine is the core component of hydro power station. Cavitation has always been one of the main threats to the safe operation of hydraulic turbine units. In order to improve the overall classification and recognition accuracy of cavitation noise signal features of hydro turbine, a deep learning algorithm model based on stack sparse coding combined with random forest is proposed, and the optimal parameter selection of the algorithm model is analyzed in detail, so as to enhance the efficiency of deep learning algorithm. A group of cavitation noise signals with different intensities are selected. On the premise that other parameters of the algorithm remain unchanged, and choose a different parameter each time of training, and the optimal parameters of the algorithm are finally found; The default parameter algorithm model and support vector machine algorithm are used for comparison. The results show that the deep learning algorithm is superior to the traditional classification and recognition algorithm, and the overall classification and recognition accuracy of the deep learning algorithm using the optimal parameters is effectively improved. The research results can be used as an important reference for the deep learning algorithm to extract, classify and identify the cavitation noise intensity characteristics of hydro turbines.
Monitoring and Analysis of the Current Environmental Situation of Electromagnetic Radiation from 5G Application Base Stations
Authors: Gong Yuan , Guo Xiaoqi , Liu Qiuxin , Long Yifei , Li Yangwei
Published: April 2022

With the rapid development of the 5G era, the concern of human health risks caused by the construction of mobile base stations has also come to light. To understand the current situation of the electromagnetic radiation environment of 5G application base stations is the basis for avoiding the old road of “pollution before treatment” in environmental management and solving the problem of neighbourhood avoidance. At the beginning of the year, we started to monitor the electromagnetic radiation environment of 5G application base stations in major urban roads, logistics centres, residential areas and university gathering areas, etc. According to the analysis of the monitoring data, the electromagnetic radiation environment levels of 5G application base stations at various monitoring points in urban areas all meet the requirements of the Electromagnetic Environment Control Limits (GB8702-2014). With the development of 5G and the application of various scenarios, it is still necessary to continuously monitor the electromagnetic radiation environment in the future in order to grasp its changing trend.
Satellite Observations of Karman Vortex Streets Induced by Islands from the Aspects of SSC in Hangzhou Bay, China
Authors: Wang Jianhui
Published: April 2022

We explored the details of Karman vortex streets (KVS) induced by islands in the Hangzhou Bay using high resolution Chinese Gaofen-1 data and Landsat-8 data. Thirty images, including 15 images obtained by Wide-Field-View (WFV) sensor from Chinese Gaofen-1 and 15 images obtained by Operational Land Imager (OLI) aboard Landsat-8, were applied to retrieve Suspended Sediment Concentration (SSC) based on a prior model. The results show that: 1) The Karman vortex streets induced by small islands can be detected clearly by high resolution satellite data from the change of SSC. 2) The Karman vortex streets contain 3-5 subunits, and the further away from the island, the larger the scale of vortex streets. Generally, the length of the vortex street is between 1500 m and 9800 m.
Research on Fast Self-alignment Method of SINS under Vehicle Jitter and Leveling Disturbance
Authors: Li Pu , Yang Tao , Li Ming , Zhao Xiao-xin
Published: April 2022

Using the combination of simulation and actual measurement, analyze the impact of disturbances such as the jitter of the launch vehicle drive motor and the leveling motion of the launch vehicle on the output signals of the gyroscope and accelerometer, clarify the alignment error source of the SINS, and combine the error model to design based on the Kalman classical filter. For the algorithm’s variable mode filtering scheme, a variable mode filtering alignment method using the output pulse threshold of the horizontal gyro is proposed, and the filtering method in the fine alignment stage is improved. Vehicle experiments show that the proposed variable mode filtering method has a simple algorithm and a small amount of calculation, and can effectively suppress dynamic disturbances such as engine jitter and vehicle leveling motion, improve the convergence speed of the azimuth error of the strapdown inertial navigation system, and reduce the azimuth misalignment angle estimate bias.
Research on Diagnosis of Loss of Flow Accidents in Nuclear Reactor Coolant System
Authors: Qin Liming , Yang Xiaohua , Liu Jie , Ma Jiayu
Published: April 2022

The reactor coolant system is one of the most important systems in a nuclear power plant. The safe and stable operation of the reactor coolant system is related to the safety of the nuclear power plant. With the rapid development of nuclear power technology, it is particularly important to ensure the safety of nuclear power plants. This paper takes the third-generation reactor AP1000 as the research object, firstly analyzes the typical accidents of the coolant system, and establishes a three-layer fault model, and then introduces the counterfactual reasoning method to take the Loss of Flow Accident as an example to identify the accident, and compares it with the traditional data-driven The Bayesian network diagnosis method was compared with the Bayesian network diagnosis method, and finally the accident was diagnosed by the simulation software Pctran. The results show that the method can accurately identify the fault and is better than the Bayesian method, which can provide decision support for accident handling and ensure the safety of the reactor.
Detection of Harmonic Components using the FFT and Instantaneous Reactive Power Theory
Authors: Zhang Shuang , Tian Bei , Liang Jian , Cheng Yuanchu
Published: April 2022

Harmonics is a widespread phenomenon in power system. With the rapid development of new energy generation, it is more urgent to monitor and suppress harmonics in power system. Considering the accuracy and real-time of harmonic detection, a novel harmonic detection method based on FFT and instantaneous reactive power theory is proposed. In this method, the harmonic frequency of the signal to be measured is first determined by windowed FFT, and then the harmonic amplitude and phase are calculated by an improved harmonic detection method based on instantaneous reactive power theory. The example results show that the proposed method has high detection accuracy and good real-time performance, and it can realize the fast detection of harmonics.
Torque Ripple Control Strategy of Switched Reluctance Motor Based on BP Neural Network
Authors: Xu Junxin , Huang Chaozhi , Cao Wensheng , Wu Yuliang
Published: April 2022

Switched reluctance motor (SRM) has many advantages, but when the motor is running, the fixed turn-on angle will cause the torque ripple of the motor at different speeds and loads. Therefore, an torque ripple control strategy of switched reluctance motor based on BP neural network is proposed. Firstly, the nonlinear relationship among speed, load torque and opening angle is established by using the fitting generalization ability of BP neural network. In this step, the optimal angle data under the minimum pulsation needs to be obtained by simulation. After collecting data, select and classify the data, and then train and improve the neural network, That nonlinear relationship is introduced into the motor control strategy, so that the motor can automatically adjust its opening angle according to different rotational speeds and load torques and achieve the purpose of reducing torque ripple under different working conditions. Finally, the motor simulation model is built in Matlab/Simulink, and the results are analyzed. This control strategy can control and reduce torque ripple.
Unsteady Aerodynamic Simulation Test Based on Ampere Force and Electromagnetic Field
Authors: Hou Yingyu , Li Qi , Zhang Ziqiang
Published: April 2022

Unsteady aerodynamic force refers to the aerodynamic force that the magnitude and direction of the load borne by the aircraft will change with time during flight. Usually, the simulation of unsteady aerodynamic force is completed by wind tunnel test. This paper introduces a new load simulation method based on electromagnetic field and Ampere force. Compared with the traditional wind tunnel test method, electromagnetic field load test will greatly reduce the test cost and make it possible to repeat multiple tests. In order to verify whether the test method is feasible and effective, this paper introduces a number of verification tests, including static load test and dynamic quasi modal test. By comparing the ground test results with those based on ABAQUS simulation, the reliability of the test method is verified. In this test technology, electromagnetic technology is used to study the force of structure, which is of great significance for multi physical field test and aircraft design test.
Discussion of Third Harmonic Voltage Characteristics of Large Hydro Generator Stator Winding and Improvement of Ground Protection
Authors: Tan Liming , Wang Yikai , Feng Xiaosong , Zhang Chunhui , Yin Xianggen
Published: April 2022

Large hydro-generators require a 100% protected area for stator ground protection. Because the fundamental voltage criterion has low sensitivity near the neutral point, a high sensitivity third harmonic voltage criterion is needed to ensure that the generator can accurately respond to stator ground fault. This paper analyzes the third harmonic voltage characteristics of two large hydro-generators, calculates the sensitivity of the existing third harmonic criterion, and points out that the impedance parameters of the grounding transformer should be considered. In view of the lack of sensitivity of the third harmonic criterion for large hydro-generators, this paper proposes a stator ground protection criterion based on the third harmonic voltage variation, which has zero action quantity under the generator non-fault conditions and zero braking quantity after a ground fault occurs, and thus has high sensitivity and can effectively respond to high-resistance ground faults. PSCAD/EMTDC simulation results show that the proposed method has high sensitivity at different fault locations and transition resistances, which can provide theoretical support for the improvement of stator grounding protection in practical engineering.
Space Detector Health Prediction Based on Online Neural Network
Authors: Zhang Ying , Tian Feng , Chen Wei , Li Ran
Published: April 2022

The paper presents a real - time online neural network algorithm for space detector health prediction. This method is suitable for embedded space detector, avoiding the disposal scheme that can not be processed online and can only be remedied afterwards, and adopting embedded real-time neural network model with preserved performance after compression. It consists of five parts: data input simulation, data set training model, prediction model, combination model and health degree calculation.
Real-time Acquisition and Analysis Test Data of Commercial Vehicle Handling Stability Based on LABVIEW Virtual Instrument
Authors: Du Yucheng , Dong Jinsong
Published: April 2022

Aiming at the problems of complex time-consuming and heavy data processing workload in the field test of commercial vehicle handling stability, a vehicle handling stability test solution based on virtual instrument technology is proposed. This solution is based on the existing test equipment and conditions, using LABVIEW virtual instrument, integrated application of GPS, AHRS and steering force angle tester to form a set of road test system solutions that can realize vehicle handling and stability. The system can meet the requirements of the national standard Controllability and Stability Test Procedure for Automobile (GB / T 6323-2014) to realize the vehicle handling stability test, and the system test is verified by the real vehicle test data, which provides a more efficient and convenient test method for the study of vehicle handling stability test.
Consensus Protocol to Implement Target Tracking
Authors: Wang Ronghua , Xia Wenjuan , Feng Shulin
Published: April 2022

Consensus protocol is suggested for target following of two non-holonomic robots. For moving robot platform, the computer that acts as the controller, and the robots to establish wireless local area network (WLAN), the remote control of the robot is achieved by transmitting data through cordless communication. Kinematics mathematical modelling and pose error model of the moving automaton are raised, applying consensus protocol to implement trajectory tracking. Emulation effects demonstrate that the suggested control way is feasible.
Entanglement dynamics of thermofield double states in integrable models
Authors: Lagnese Gianluca , Calabrese Pasquale , Piroli Lorenzo
Published: April 2022

We study the entanglement dynamics of thermofield double (TFD) states in integrable spin chains and quantum field theories. We show that, for a natural choice of the Hamiltonian eigenbasis, the TFD evolution may be interpreted as a quantum quench from an initial state which is low-entangled in the real-space representation and displays a simple quasiparticle structure. Based on a semiclassical picture analogous to the one developed for standard quantum quenches, we conjecture a formula for the entanglement dynamics, which is valid for both discrete and continuous integrable field theories, and expected to be exact in the scaling limit of large space and time scales. We test our conjecture in two prototypical examples of integrable spin chains, where numerical tests are possible. First, in the XY-model, we compare our predictions with exact results obtained by mapping the system to free fermions, finding excellent agreement. Second, we test our conjecture in the interacting XXZ Heisenberg model, against numerical iTEBD calculations. For the latter, we generally find good agreement, although, for some range of the system parameters and within the accessible simulation times, some small discrepancies are visible, which we attribute to finite-time effects.
3D scanning as an architectural tool
Authors: Potangaroa R
Published: April 2022

Laser scanners are gaining acceptance as a tool for three-dimensional modelling of existing buildings, but not much more than that. The idea that a digital model constructed from hundreds of thousands of measured laser points having ‘soulful’ applications remains foreign to Architects. This paper presents the work that has been ongoing for over 5 years at the School of Architecture at Victoria University of Wellington in New Zealand and the ‘soulful’ experiences we have encountered in that work.
Sustainability for whom? Cities and buildings through the lens of older people
Authors: Soebarto V
Published: April 2022

As we move towards larger and more complex urban developments and with increasing occurrences of extreme weather resulting in significant environmental, societal and economic impacts, it is no longer a question that cities around the world must aim for sustainability. The past few decades have seen efforts by many countries to tackle these critical issues. At the same time, many countries also face significant demographic changes, with almost a quarter of their population over 65 years will be ageing in place, in their own homes. Yet cities, particularly our inner-city built environments, are spaces that are usually imagined, planned and structured for a younger, working-age demographic. This paper discusses the current gap in knowledge in addressing sustainability of our cities and buildings, and proposes a new way of engaging people who are often forgotten, yet they have many years of experience and wisdom about how to live sustainably: the older people. Two examples of ongoing research with older ‘citizen scientists’ are presented. Both cases demonstrate that it is critical to consider cities and buildings from the eyes of older people in society.
Development of a wind catcher for high-rise apartments in the hot-humid climate of Indonesia
Authors: Kubota T , Takahashi T , Trihamdani A R , Mori H , Asawa T
Published: April 2022

This study aims to develop a new device, “cross-wind catcher”, for mid-to-high-rise affordable apartments for improving the ventilation performance in the tropics, where the natural ventilation is considered essential. We conducted a primary simulation study to find optimum wind catchers, followed by a field experiment using a full-scale experimental building to confirm the effects of the proposed device. The results showed that the proposed cross-wind catcher was able to increase the ACH by approximately 1.2 to 1.4 times compared with the control unit.
Analysis on the effect of home appliances use to electricity consumption during WFH
Authors: Hutama S F , Ghifari M Y A , Ula I T , Yong S D , Soemardiono B , Septanti D , Sekartaji D , Novianto D
Published: April 2022

Various forms of quarantine and social restrictions to prevent the spread of the COVID-19 pandemic has impacted lifestyle. WFH has emerged as a growing trend in this new normal era. The implementation of WFH results in all work-related activities becoming home-centred. This study aims to analyse the pheasant and find out the effect of household appliance use on energy consumption during the implementation of WFH. The questionnaire survey was conducted in April 2020 and it collected 215 responses from residents of Indonesia, during the pandemic which was distributed online. The data were analysed using a multiple regression analysis with SPSS to determine the relationship between variables. The results showed that the length of WFH time affected an increase of energy consumption especially from the use of home computer, internet, rice cooker, AC, and water needs. In addition, the increase that happened also depends on the population living and the size of the building they live in. If this continues, it could lead to the risk of an energy crisis. Strategies related to proper distribution and energy demand are needed to build resilience and form a sustainable society.
Influence of a facade design on thermal and visual comfort in an elementary school classroom
Authors: Suradhuhita P P , Setyowati E , Prianto E
Published: April 2022

Thermal and visual comfort are important elements in the learning process. The object chosen was the classroom of the Sawah Besar 01 public elementary school, Semarang where the building tends to have a homogeneous facade design but with openings that have varying orientation directions. This affects the level of comfort both thermal and visual in the classroom. Data analysis was carried out quantitatively, namely to obtain a thermal comfort index and natural lighting comfort index according to the Indonesia National Standard. The thermal comfort conditions of all selected rooms on the 1st and 2nd floors did not meet the comfortable thermal comfort standard for classrooms. Rooms 1 and 2 on the 1st floor tend to be above the minimum level of classroom lighting. Room 3 on the 2nd floor tends to be stable and all of them are above the minimum limit. In room 4 on the 2nd floor, the general lighting level has exceeded the minimum limit. New façade opening designs and mechanical ventilation aids need to be applied to improve thermal and visual comfort according to the Indonesia National Standard.
The sustainability of the Pegat Lake as the centre for the orientation of the Giri kingdom, socio-cultural studies
Authors: Koderi M , Soemardiono B , Faqih M
Published: April 2022

The synergy between environmental sustainability and technological progress is the key to sustainable development. The dependence of the people of the Giri Kingdom on the Pegat Lake as a source of clean water as well as the orientation centre of the Giri Kingdom’s downtown area, has shifted due to the development of the city and advances in clean water technology. The potential for socio-cultural sustainability which is based on the existence of Pegat Lake is the strength of the meaning of local wisdom which is a process of harmonious relationship between nature, humans and architecture is starting to be forgotten. This paper explores the role of Pegat Lake from time to time based on artefacts, data and history as well as notes on the results of previous research. The important finding of interdependence between the Pegat Lake area, the Giri Palace area and the Tomb and Ainul Yaqin Mosque area is a strength of sustainability to continue to be developed according to the socio-cultural demands of the community as well as the development of religious and historical-based ecotourism as an answer to sustainable regional development.
Rehabilitation of substandard housing program’s benefits: lesson learned from Plandi Village, Jombang Regency
Authors: Pusporini N , Palupi W R , Santosa H R , Septanti D , Cahyadini S
Published: April 2022

The rehabilitation of substandard housing (Rumah Tidak Layak Huni or RTLH) program is an effort of both central and local governments to provide decent housing for the low-income community. Over the past four years, Plandi Village has received substandard housing rehabilitation grants in the form of building materials and cash. This research will describe the physical and non-physical benefits felt by the beneficiaries using a qualitative descriptive method based on interviews, literature studies, and related documents. The results show that the beneficiaries can experience physical benefits in the form of a house that is suitable for habitation which is sturdy and healthy in providing enough light and sanitation as well as a standardized building floor area. Meanwhile, the non-physical benefits obtained are improved and more functional space to carry out daily activities in the house, even increasing their social status.
Housing challenges in sinking coastal city: rethinking urban housing in subsidence area for a more resilient community
Authors: Hamdani R S , Hadi S P , Rudiarto I
Published: April 2022

Housing in coastal cities is facing complex environmental hazards. The risk of being permanently submerged caused by sea level rise-related flooding is aggravated by the localized hazards, which is land subsidence. We explored the land subsidence conditions in the housing zone of Semarang City using overlay spatial analysis, and we expand the discussion to the regulatory aspect and local adaptation through content analysis. We found that challenges in housing zone are the severe subsidence that is occurring on dense housing zone, regulation that still less sensitive towards incorporating the slow onset disaster and not properly provided housing hydrological consideration nor the water provision, and poor drainage system as well as limited adaptation capacity that makes people lives in a false harmony of being resilient. Affordable alternative housing such as stilt house and drainage infrastructure improvement as well as detailing and reframing building regulation that is adequate to address both subsidence and flooding is undeniably important to ensure the adequate housing is accessible for all coastal city residents.
Development of post-disaster shelters (case study: Gampong Pande post-rehabilitation and reconstruction of the earthquake and tsunami disaster)
Authors: Setyawan W , Setijanti P , Hayati A
Published: April 2022

Indonesia has a high risk of earthquake and tsunami disasters, especially in areas around the long and relatively sloping coastline. Nanggroe Aceh Darussalam as an area that has been hit by an earthquake and tsunami, in its development of settlements it is more directed to disaster-prone areas in coastal areas. This study aims to identify the development of housing after rehabilitation and reconstruction due to the earthquake and tsunami in the Gampong Pande area, in the context of mitigating earthquake and tsunami disasters in the future. This research is related to ethnographic research that uses an emic approach in field surveys, emphasizes the natural setting context, focuses on interpretation and meaning, involves the community deeply, and focuses on contemporary phenomena as a whole. Post-disaster mitigation actions carried out in residential development are structural modifications referring to and in line with the Building Code. Post-disaster mitigation actions carried out in the development of residential areas are land grants for road widening as an evacuation route during disasters and the construction of sea dikes to reduce tidal waves of sea water entering settlements and planting mangroves along the sea wall as a green belt that doubles as a green belt and source of fishermen’s economy.