bluuebunny/crossref_metadata_2025_split huggingface dataset:
Using binary-stiffness beams within mechanical neural-network metamaterials to learn
Authors: Hopkins Jonathan B , Lee Ryan H , Sainaghi Pietro 
Published: January 2023

Abstract
This work introduces the concept of applying binary-stiffness beams within a lattice to achieve a mechanical neural-network (MNN) metamaterial that learns its behaviors and properties with prolonged exposure to unanticipated ambient loading scenarios. Applying such beams to MNN metamaterials greatly increases their learning speed and simplifies the actuation demands, control circuitry, and optimization algorithms required by previously proposed concepts. A binary-stiffness beam design is proposed that uses principles of constraint manipulation and stiffness cancelation to achieve two switchable and discrete states of stiffness (i.e. binary stiffness) along its axis. The beam achieves a near-zero low-stiffness state and a large difference in stiffness between its high and low-stiffness states, which are both shown to be desirable attributes for learning mechanical behaviors. Simulations are conducted to characterize the effect of lattice size, the difference in stiffness between the constituent beam’s high and low-stiffness states, the magnitude of its low-stiffness state, and the number of simultaneously learned behaviors on MNN learning using binary-stiffness beams. Thus, this work provides a necessary step toward enabling practical artificial intelligent metamaterials.
Effect of external longitudinal magnetic field on the dynamics of pulsed plasma stream
Authors: Ahmed A , Singha S , Neog N K , Borthakur T K 
Published: January 2023

Abstract
A spectroscopic study is carried out to investigate pulsed plasma stream produced in a coaxial plasma accelerator under the influence of an external longitudinal magnetic field. The dynamics of Argon plasma stream that includes the excitations and emissions of plasma species and its different parameter variations on the application of an external longitudinal magnetic field are reported in this work. The behavior of the ionized and neutral species of argon plasma is studied from their intensity distribution profiles which indicate the occurrence of faster recombination as compared to the field-free case. The variation of pressure reveals a significant influence on the recombination and diffusion process of the plasma species. Moreover, the variation of cathode voltage leads to variation in input energy to the system which influences the ionization and excitation processes of the plasma species. A plasma density (Ne) jump is achieved from 1021–1022 m−3 at a relatively higher pressure ∼8 bar plenum pressure in presence of the magnetic field. Saturation of the emissions and excitations of plasma species are revealed from the intensity profile and electron excitation temperature (Texc) profile which occur at different pressure and voltage both for field and field-free cases. The electron temperature (Te) is estimated using the FLYCHK code by comparing the simulated charge state distributions with the experimental findings. Using known parameters in the code, the different estimated Te shows a linear and an exponential decrement respectively in the absence and presence of the magnetic field. Maximum Te of 2.2 eV is reported which decreases to 1.51 eV at a significant increase of plasma density of 1022 m−3.
Achieving low contact resistivity in PEDOT:PSS/n-Si solar cells
Authors: Kumar Anil , Antony Aldrin , Nair Pradeep R 
Published: January 2023

Abstract
Good conductivity and transparency in the visible spectrum along with low processing temperatures and ease of fabrication make Poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS) a widely accepted polymer for organic-inorganic hybrid heterojunction solar cells. Although the overall conductivity of the PEDOT:PSS is high, the PSS segregates more at the surfaces of the deposited film. This leads to high contact resistivity of PEDOT:PSS film with metal and silicon. In this report, we explore the effect of the spin coating rates on the contact resistivity of PEDOT:PSS with the metal and silicon and the associated performance of PEDOT:PSS/n-Si solar cells. Two different spin speeds of 1000 rpm and 4000 rpm were used to deposit the PEDOT:PSS films over silicon. The PEDOT:PSS films were also deposited in single- and double-layer forms. We could achieve very low contact resistivity of PEDOT:PSS with silicon through spin speed optimizations. Hence, the overall performance of the PEDOT:PSS/n-Si solar cells improves with the spin speed for both single- and double-layer PEDOT:PSS film depositions.
A high-performance SSVEP-based BCI using imperceptible flickers
Authors: Ming Gege , Pei Weihua , Gao Xiaorong , Wang Yijun 
Published: January 2023

Abstract

Objective. Existing steady-state visual evoked potential (SSVEP)-based brain-computer interfaces (BCIs) struggle to balance user experience and system performance. This study proposed an individualized space and phase modulation method to code imperceptible flickers at 60 Hz towards a user-friendly SSVEP-based BCI with high performance. Approach. The individualized customization of visual stimulation took the subject-to-subject variability in cortex geometry into account. An annulus global-stimulation was divided into local-stimulations of eight annular sectors and presented to subjects separately. The local-stimulation SSVEPs were superimposed to simulate global-stimulation SSVEPs with 47 space and phase coding combinations. A four-class phase-coded BCI diagram was used to evaluate the simulated classification performance. The performance ranking of all simulated global-stimulation SSVEPs were obtained and three performance levels (optimal, medium, worst) of individualized modulation groups were searched for each subject. The standard-modulation group conforming to the V1 ‘cruciform’ geometry and the non-modulation group were involved as controls. A four-target phase-coded BCI system with SSVEPs at 60 Hz was implemented with the five modulation groups and questionnaires were used to evaluate user experience. Main results. The proposed individualized space and phase modulation method effectively modulated the SSVEP intensity without affecting the user experience. The online BCI system using the 60 Hz stimuli achieved mean information transfer rates of 52.8 ± 1.9 bits min−1, 16.8 ± 2.4 bits min−1, and 42.4 ± 3.0 bits min−1 with individualized optimal-modulation, individualized worst-modulation, and non-modulation groups, respectively. Significance. Structural and functional characteristics of the human visual cortex were exploited to enhance the response intensity of SSVEPs at 60 Hz, resulting in a high-performance BCI system with good user experience. This study has important theoretical significance and application value for promoting the development of the visual BCI technology.
Study on the Sealing Performance of O-ring under High-Pressure Environment
Authors: Li Zhen 
Published: January 2023

Abstract
The sealing properties of the O-ring of the hydraulic cylinder plunger rod under a high-pressure environment are related to a variety of factors. In this paper, we first establish a simulation model based on an O-ring reciprocating shaft seal under a high pressure-environment through finite element software and study the influence of the compression rate, static pressure, and reciprocating speed of the plunger rod on the sealing performance of O-ring through the simulation model, and then analyze the maximum stress of O-ring during installation, hydrostatic loading and reciprocating motion with the variation of structural parameters. The results indicate that the compression rate of the installation process has a significant effect on the sealing performance of the enhanced O-ring. In the hydrostatic loading process, the equivalent stress of the O-ring is increased with the increase of the compression rate, when the static pressure is low and decreases, and when the static pressure is high, and the equivalent stress shows an increasing trend and the same increase; in the reciprocating motion process, when the static pressure is low, the equivalent stress and contact stress of the O-ring does not change significantly with the compression rate, and when the static pressure is high, there is an obvious phenomenon of abrupt change. The frictional stress of the reciprocating motion is increasing, then decreases, and then increases with the change in static pressure.
Mechanical Design of a system for transplanter based on PLC
Authors: Fan Xiaodong 
Published: January 2023

Abstract
At present, the development of potted flower seedling transplanting technology at home and abroad is an important measure to comply with the trend of the high growth rate of potted flower production, solve the existing low productivity problems and promote the modernization of potted flower planting in China. It has a profound influence on the transplanting mechanism of potted flower seedlings which have good stability, easy diffusion, and a good development environment. In the PLC(Programmable Logic Controller) system, the instructions and output of the seedlings and seedlings are input and the manipulator is controlled by the manipulator. The cylinder is driven by the mechanical arm, and the refreshed program order reissues the instruction task. In this design, the greenhouse flower seedling transplanter has the functions of grasping seedlings, transporting seedlings, and placing seedlings. During the transplanting process, PLC software is used to control the air cylinder and various motors to drive each working part, so that the transplanting process can be carried out in order and the precise transplanting of flower seedlings can be completed.
Study on a Circular Cylindrical Floating Device and Its Motion Response Characteristics
Authors: Ding Minting , Chen Zhenlei 
Published: January 2023

Abstract
In this paper, a circular cylindrical floating device design is proposed by combining the structural features of the cylindrical Floating Production Storage and Offloading (FPSO) and the deep-sea Spar platform. It is suitable for deep-water oil and gas field development environment in the South China Sea. This floating device adds six floats with a Spar platform hard tank role based on the cylindrical FPSO to improve the buoyant center. This paper analyzes the motion response characteristics of the circular cylindrical floating device in waves by the Eulerian multi-phase flow model of STAR-CCM+. The results show that the pitch motion characteristics of the circular cylindrical floating device are better than those of the cylindrical FPSO and ship-type FPSO in the reference [8]. In addition, the paper also investigates the motion response of the circular cylindrical floating device with different directions of the incoming flow. The analysis shows that this floating device has the lowest motion response at 30° direction incoming flow. And the Response Amplitude Operator (RAO) of pitch motion shows a negative correlation with the incoming flow direction. The research results of this paper can provide a reference for the future development of marine resources, and have a certain practical significance.
Application Research of Pulse Vibration High-Frequency Voltage Injection Method Without Speed Sensor in New Energy Vehicles
Authors: Han Yangqi , Zheng Yaqing , You Yuancheng , Chen Yajuan 
Published: January 2023

Abstract
The high-frequency voltage injection method of pulse vibration in the range of zero/low speed to medium-high speed has to be demonstrated for new energy vehicles., because it is very necessary and necessary to control the safety performance of the whole vehicle without speed sensor. The permanent magnet synchronous motor starts slowly to circle when the clean - energy vehicle cranked, and the correctness of the rotor’s startup position identification is significant. In order to achieve high-performance control of permanent magnet synchronous motor without speed sensor, this paper focuses mainly on how to estimate the rotor position of permanent magnet synchronous motor by amplifying the mathematical model of the motor. The high-frequency mathematical model of the permanent magnet synchronous motor’s voltage parameters are attained in the process of maintaining the motor’s preoperational position to address the problem of self-adaptability between the injected voltage and the likely phase current. The initial position identification of the rotor of a permanent magnet synchronous motor can be achieved by optimizing the adaptive method, and the pulse vibration highfrequency voltage anesthetic method also shows better efficiency and safety when the motor achieves a stable start and has sound output torque. The struggling to retain adaptive measurement device vibration high frequency voltage injection approaches is used by the light-duty low-speed new energy vehicle, which may minimize the mechanical speed sensor after becoming damaged, save the cost and improve the compactness of the electric vehicle space design, which is conducive to solving the situation of energy shortage in my country and alleviating environmental pollution. This is in line with the future development concept of society.
A TSV-Based Helical Dual-Band Antenna
Authors: Wang Fengjuan , Ren Jiashuo , Yu Ningmei , Yang Yuan 
Published: January 2023

Abstract
This paper come up with a novel helical dual-band antenna that can be used in terahertz (THz) band applications. The antenna is fed by a redistribution layer (RDL), and the metal patch is formed on the top and bottom surfaces of the silicon dielectric substrate, which is connected by through-silicon via (TSV) to form a helical structure. At the same time, better impedance matching can be achieved by changing the shape of the ground plate to achieve dual-band characteristics. The simulation results presentation that the return loss of the antenna in 319GHz-339GHz and 373GHz-388GHz is less than -10db, and it has good axial radiation characteristics.
Study on the Measured Signal Analysis Method Based on Sine Curve-fit Method for Ship Model Seakeeping Test
Authors: Shi Sheng-zhe , Jiang Ting , Wang Fan , Zheng Xiao-long 
Published: January 2023

Abstract
Ship model seakeeping test measure data included frequency ponderances of syntonic waves, mixed waves, and white noise, which affect the test result. Heave time series and pitch time series of planning hull model seakeeping test are calculated by the three-parameter sine wave curve-fit method. Amplitude, angular frequency, and phase angle are obtained. The result shows that the distortion degrees of heave and pitch decrease gradually with an increase in wavelength; when the test wavelength is 8.8m, the distortion degrees of heave and pitch are the smallest, which reach 2.79% and 4.69%; however, at a wavelength of 11m, the distortion degrees of heave and pitch increase.
Multi-beam Sonar Signal Simulation and Field Programmable Gate Array Implementation
Authors: Luo Yu , Li Shiwen , Shi Jian , Cheng Mengdi 
Published: January 2023

Abstract
The multi-beam bathymetric sonar system is one of the top pieces of equipment for ocean exploration. The action distance of multi-beam bathymetric sonar depends on the pulse width of the signal, and the distance resolution depends on the bandwidth of the transmitted signal. In this paper, a chirp signal generation method for shallow water multibeam sonar based on FPGA is presented to improve the performance of multibeam bathymetric sonar. A chirp signal is generated using a hardware description language with a bandwidth of B = 50 kHz and a pulse width of T = 1 ms. Compared with the traditional look-up table method, this method could release plenty of hardware resources.
Influence of Slot Combination on the Vibration of Low-Noise Asynchronous Motor
Authors: Feng Haijun , Zhang Yue , Chen Changsheng , Fu Dongliang , Li Guoping 
Published: January 2023

Abstract
The slot combination of stator and rotor plays a decisive role in the tangential force and radial force of the motor, to obtain the influence of slot combination on motor vibration and noise, taking a 55kW asynchronous motor with a maximum speed of 1500 r/min as an example, and four kinds of motors with different slot combination were designed. The order and frequency of electromagnetic force waves with different slot combinations were estimated by numerical method, and the influence of slot combination on the vibration of the motor was studied by test.
Research on Logic Loading Process and Signal Integrity based on Prom
Authors: Sun Pei , Ji Jin , Guo Jingtao , Fan Xinming 
Published: January 2023

Abstract
a certain embedded product failed to load FPGA configuration occasionally when it was powered on. In order to determine the cause of the failure, the principle of FPGA configuration circuit was studied, and the possible causes of the failure were analyzed. Through testing, theoretical analysis and comprehensive simulation, it was finally determined that the layout of CCLK matching resistance was unreasonable, which led to the wrong loading of configuration data caused by CCLK false edge acquisition. Finally, the corrective measures are proposed for the fault, and the test shows that the measures are reasonable and effective.
An Analysis of Miniaturization of 5G Massive MIMO Base Station Antenna
Authors: Gu Hanyang 
Published: January 2023

Abstract
This paper reviews current works and efforts on the miniaturization of the 5G Massive MIMO base station antenna design. This paper first introduces the development of the Massive MIMO, with a proper mathematical illustration. Then, some conventional parameters are introduced to measure the performance of the antenna, with a connection to the miniaturization of the antenna. Specifically, two coefficients: the gain-to-volume ratio and isolation-to-volume ratio are constructed to measure the efforts in miniaturization. Tables that collect works in the literature are presented, with detailed comparisons among working situations. Then a general conclusion and future path of miniaturization are indicated. At last, the paper introduced the challenge and future of the miniaturization of the 5G Massive MIMO base station antenna.
Density functional theory study of AlN/Hf interface
Authors: Zhang Chaoyang , Zhang Lixia , Zhuo Ziming 
Published: January 2023

Abstract
In this study, the performance of AlN (0001)/Hf (0001) interface, such as occupation characteristics and combined energy, were studied by using the first principles calculation package. In the AlN/Hf interface, the Al- and N-terminated interfaces have three stacking sites each (outermost top site, sub-outer top site, and hexagonal close-packed hollow site), comprising six different models. The most adhesion work occupies the N-terminal interface of the hcp-hollow site, and the interface energy was also the smallest and most stable, as well as a lower fracture work than the AlN/Ti interface. Moreover, the differential charge density were calculated, the partial density of states were plotted, and the bonding properties were discussed. Compared with other interfaces, the N-terminated interface with the hcp-hollow site exhibited more covalent characteristics; on the Al-terminated interface with the sub-outer top site, the Hf-Al metallic bond was formed. The most stable atomic occupation type in AlN/Hf interface is the hcp-hollow site of N atomic terminal.
Effect of applied stress on corrosion properties of Q235 steel with multi-layer epoxy coating
Authors: Zhang Ruixiang , Dong Yuguo , Liu Ling , Qu Xingdong , Liu Feng , Wang Yang , Peng Longgui , Du Lifei 
Published: January 2023

Abstract
Organic coating is one of the most effective, economical and universal methods for corrosion resistance of metal at a small, but the stability of the coating is highly dependent on the applied stress. In the study, a comprehensive experiment was conducted to investigate the corrosion progress of Q235 steel sheets in 3.5% NaCl solution and 10% H2SO4. The effect of applied stress on the corrosion as well as the corresponding adhesion characteristics of Q235 steel are examined and quantitatively analyzed. Results indicate that, compared with the NaCl solution, the H2SO4 solution has aggressive corrosion on the Q235 steel sheets, and the corrosion would be largely aggravated with increasing applied stress. Additionally, the decreased adhesion grade of the epoxy coating is a synergic result of the immersion time and the stress, and the continuous dissolution of the coating would lead to the aggravation of corrosion, which side-fact indicates that the prepared epoxy resin paint could show efficient anti-corrosive properties. Therefore, the stress has a direct influence on the adhesion ability of the prepared epoxy resin coating, which would decrease the anti-corrosion properties of the coating.
Comprehensive Analysis of Capacitance and Inductance Effect in the RLC Circuit Toward the Cut-off Frequency and Bandwidth
Authors: Qian Kun 
Published: January 2023

Abstract
Electronics filter design is essential for signal processing tasks in electronics, biomedical engineering, and control systems. Filter design in the frequency domain is based on the foundation laid by the theory of Fourier transform developed by Joseph Fourier in 1807, where the filter is intended to remove unwanted frequency components from the input signal. Lumped electronic filters are constructed by components of resistor (R), capacitor (C), and inductor (L). In this study, we comprehensively explored how different values of capacitors and inductors impact the cut-off or center frequency in the series LC or RLC circuit. Analytical solutions of the magnitude of the ratio between output and input voltage are provided and the results from simulations are used to compare with the derivations from the analytical solutions. The simulation result is within the range of +-0.65% of the theoretical value due to numerical precision from the simulation tool LT-Spice.
Design and Research of a hanging and releasing unmanned craft deployment and recovery
Authors: Li Xiangyu , Zhao Yapeng , Miao Hailin , Wangyong  
Published: January 2023

Abstract
The application potential of unmanned craft in navigation, patrol, detection, search and rescue, maritime interception, and other fields is becoming increasingly prominent, the research and development of unmanned craft in various countries have been strengthened, however, the research and development of deployment and recovery technology, which is matched with the combat mission of unmanned craft, as the core technology, is relatively lagging. In this paper, a hanging and releasing device for the unmanned craft is designed, the design scheme of the deployment and recovery device is introduced, the risk of collision between the unmanned boat and the main ship is evaluated, and structural calculations are performed using finite element analysis software. The results show that the deployment and recovery device scheme of the unmanned craft is reasonable and feasible, which provides guidance and reference for the design of relevant devices in the future.