bluuebunny/crossref_metadata_2025_split huggingface dataset:
Parameter Optimization and Finite Element Simulation of the Inclined Microperforated Panel Absorber
Authors: Duan Haiqin , Shen Xinmin , Wang Enshuai , Zhang Xiaonan , Yin Qin 
Published: June 2021

Abstract
Microperforated panel absorber was widely used in the fields of noise reduction and sound absorption, because it had the extraordinary advantages. As deformation of the standard microperforated panel, inclined microperforated panel absorber was proposed and investigated in this research. The theoretical sound absorption model of the inclined microperforated panel absorber was constructed on the basement of the Maa’s theory according to the electro-acoustic theory. Structural parameters of the inclined microperforated panel absorber were optimized on the basement of the constructed theoretical sound absorption model through the cuckoo search algorithm. The finite element simulation model of the inclined microperforated panel absorber with optimal parameters was built in the virtual acoustic laboratory, which could be considered as an effective method to measure and check the sound absorption performance of the inclined microperforated panel absorber. Through the theoretical modeling, parameter optimization, and finite element simulation, sound absorption performance of the inclined microperforated panel absorber was improved, which could be propitious to promote its practical applications in the fields of noise reduction and sound absorption.
Research on customer demand acquisition method based on scrap steel reverse supply chain service platform
Authors: Yingqing Xiong , Yi Liu 
Published: June 2021

Abstract
In order to obtain the accurate service demand of scrap steel reverse supply chain for realizing the service resource composition and completion service process, the service demand is classified. Aiming at the difficulty of obtaining service demand information caused by customers’ individual differences, a demand acquisition method is proposed, and then a semantic expression model and ontology model of customer service demand are constructed. The correctness and feasibility of the service demand acquisition method of scrap steel reverse supply chain are verified by a case.
Research on MTPA Control Strategy of Permanent Magnet Synchronous Motor Based on Fast SVPWM Algorithm
Authors: Ren Yuxi , Gong Yubing , Mo Chou , Ding Zhenwei , He Yuhua , Li Anhao 
Published: June 2021

Abstract
In recent years, the poor endurance of electric vehicles has been one of the main problems that have limited the development of new energy vehicles. Improving system efficiency and reducing system losses are currently one of the main methods to improve endurance. A fast SVPWM (Space Vector Pulse Width Modulation Technology) algorithm is used to improve the traditional SVPWM judgment, simplifying the complicated coordinate transformation and trigonometric function calculation of the traditional SVPWM technology judgment. Then it is applied to MTPA (Maximum Torque Per Ampere) control for Simulink model simulation to verify the effect. The experiment proves that the MTPA control under the improved SVPWM algorithm has higher response speed and stability than the traditional id = 0 control. The size of the stator current is about 1-2A smaller than id = 0 control, which achieves better MTPA control.
Space Robot Motion Planning Oriented to Autonomous Capture Path
Authors: Jiayuan Lu 
Published: June 2021

Abstract
Anthropomorphic robots are an important part of the field of robotics. Controlling the motion of anthropomorphic robots through human movements has important research significance not only for robot control research, but also for robots in national defense, rescue, monitoring, logistics, medical care, elderly care, nursing, and education. There are a wide range of application scenarios in such fields. With the increasing maturity of motion data capture equipment and anthropomorphic robot equipment and the diversity of application environments, traditional anthropomorphic robot control algorithms can no longer meet application requirements. This paper combines Microsoft’s Kinect and Aldebaran’s Nao robot to propose a set of kinematics equation algorithms that fund the capture path to realize the realtime imitation control of human motion by anthropomorphic robots.
Study on Switch to Control Running Water Flow for the Aged
Authors: Hao Ruican , Liu Huagang , Zhu Qingsong , Li Decai 
Published: June 2021

Abstract
With the growth of age, the memory, intelligence and thinking will decline for most people. To avoid the injury or life in danger resulted from forgetting to turn off the running water switch, a special switch to measure and control the running water flow for aged was proposed. Two kinds of sensors including flow sensors and distance sensors were applied in the device to guarantee that the switch should be turned off before water in the container comes out. The configuration of the device was designed to use conveniently for aged. The required flow was firstly input on the board set on the water supply line, then the switch could be turned on and the flow sensor works to measure the water flow required. Once the flow value is up to the set value on the board, the switch could be turned off by the controller in the circuit. To guarantee the safety on the sensors in the process of the measuring, another two distance sensor were chosen and set on the running water port to complete the measuring work of the water level in the container to avoid the water coming out from the container secondly.
Systematic Research on Auto Assembly and Disassembly of Small Engine in Aircraft
Authors: Wenqiang LI , Xiangkun Sun , Chaoshi LI , He LI 
Published: June 2021

Abstract
The engine is one of the key core components in aircraft, in order to enhance automation and efficiency in the process of installation and disassembly for current small engine, using automatic control technology, a set of automatic disassembly and assembly system for aircraft engines is developed to replace the traditional mechanical installation vehicle. Corresponding for small engine to study the automatic disassembly system, the system uses laser sensors to locate the engine disassembly and assembly. Servo motors are used to drive the walking mechanism, lifting mechanism, and fine-tuning mechanism to realize multi-degree-of-freedom adjustment during engine disassembly and assembly. And the digital video is used to monitor the gap collision. Finally, the paper realizes the automatic high-precision disassembly and assembly of small engines. Through verification, the efficiency of the disassembly and assembly system has increased by more than 70%, the work efficiency has been greatly improved.
Time Response-Based Synchronous Calibration of the Pavement Asphalt Softening Point Tester
Authors: Zhou Yishu , Zhang Jin ning , Cao Jinjin 
Published: June 2021

Abstract
The asphalt softening point reflects the temperature sensitivity and high-temperature stability of asphalt pavement and is an important quality assessment indicator of asphalt pavement. The detection method of asphalt softening point commonly used in China is the asphalt softening point ring and ball tester. In JJG 057-2004 Vertification Regulation of Apparatus for Softening Point of Bitumen, the partial calibration method of the tester was proposed. The partial calibration method cannot realize the synchronous calibration of softening point and various definitions of the softening point are significantly different. Therefore, in order to achieve synchronous calibration of the asphalt softening point tester, a standard verification device was established in this study to simulate asphalt dropping and record response time and temperature simultaneously. The circuit composition, working principle, main technical indicators and influencing factors of key devices were explored and the uncertainty of response results obtained in warming water was evaluated. The evaluation results showed that it was feasible to realize the synchronous calibration of asphalt softening point tester with the verification device.
Wear behaviors of polyurethane rubber used in pipeline inspection gauge
Authors: Liu Chang , Cao Yuguang , Tian Hongjun 
Published: June 2021

Abstract
This study is concerned with the wear behaviors of the polyurethane rubber (UR) used in the pigging industry under the condition of interference fit. The pin-on-disc tribological tests were conducted to obtain the wear rate of the UR, and the wear mechanisms were identified by observing the worn surface via an optical microscope. Additionally, the relationship between the wear rate and the contact pressure was presented with the method of quadratic fitting.
Development of a neutron camera system to visualize the dose distribution by secondary neutrons for safer proton therapy
Authors: Tanaka R. , Kataoka J. , Nishi F. , Yokokawa H. , Inaniwa T. 
Published: June 2021

Abstract
Proton therapy has recently garnered significant attention
as an effective treatment for cancer that can effectively damage
tumor tissues while reducing doses to healthy tissues and
organs. However, secondary neutrons generated by interactions with
protons and brass collimators or the patient's body may cause harm
to the human body. Nevertheless, the risks are yet to be precisely
assessed or reflected in actual treatment plans. In this study, we
develop a novel neutron camera that enables the visualization of
spatial dose distribution by secondary neutrons. First, a neutron
camera comprising two layers of units is constructed; each of the
layer is composed of a plastic scintillator coupled with a
photomultiplier tube. As a preliminary experiment, it is confirmed
that the developed camera can visualize fission neutrons from a
252Cf source. Subsequently, secondary neutrons are
observed from a brass (imitating the brass collimator) and water
(imitating the patient's body) phantom irradiated with a 70 MeV
proton beam, in which the neutron camera is placed at 0∘,
15∘ (only in the case of brass) and 30∘ from each
phantom 30 cm ahead. Following neutron/gamma event selections using
two methods, i.e., time of flight and pulse shape discrimination,
each of the reconstructed images successfully converged at the
correct positions, with average angular resolutions of 21∘
(brass, full width at half maximum (FWHM)) and 19∘ (water,
FWHM). Furthermore, dosimetry using the G(E) function method is
applied to the images, enabling a dose distribution image to be
created using secondary neutrons. As a result, the evaluated dose
rate is 307 μSv/min for brass and 88.1 μSv/min for
water, which are 86 % and 64 % those of the simulated dose
rates, respectively. Eventually, future tasks for the utilization of
the camera in actual proton therapy are discussed.
A novel high dynamic-range SiPM for scintillator-based hadronic calorimetry
Authors: Jiang J. , Yu B. , Liu J. , Zhao S. , Hu T. , Niu Y. , Liu Y. , Shi Y. , Wang Y. , Zhang Y. , Wang Z. 
Published: June 2021

Abstract
The Analog Hadronic Calorimeter (AHCAL) is one option of highly granular calorimeters optimised with the Particle Flow Algorithm (PFA) and considered for experiments at future lepton colliders. It consists of dense steel plates as absorber interleaved with plastic scintillator tiles, individually read out by Silicon Photomultipliers (SiPMs). A novel SiPM developed by the Novel Device Laboratory (NDL) with an active area of 1 mm2 and a pixel pitch of 12.5 micron[NDL-SiPM-12.5] has been mainly investigated. The characterisation studies include single photon calibration, dynamic range and performance of crosstalk as well as Minimum Ionising Particle (MIP) detection efficiency of a detector unit. Combined tests with a dedicated ASIC (SPIROC2E) for multi-channel SiPMs show that single photon spectra can be obtained, given the relatively small SiPM gain (∼2 × 105). The linearity of the SiPMs in response to incident photons of less than 10,000 (500 MIPs) is within 5% from measurements. Meanwhile, the dark count rate (DCR) is around 2×10-3 Hz at a threshold 0.5 MIP (10 p.e.) and the MIP detection efficiency of a detector unit can be near 95% from the MIP spectrum. These studies indicate the NDL-SiPM-12.5 can be a photosensor candidate for the future scintillator-based hadronic calorimeters.
The square lattice Ising model on the rectangle III: Hankel and Toeplitz determinants
Authors: Hucht Alfred 
Published: June 2021

Abstract
Based on the results obtained in (Hucht 2017 J. Phys. A: Math. Theor.
50 065201), we show that the partition function of the anisotropic square lattice Ising model on the L × M rectangle, with open boundary conditions in both directions, is given by the determinant of an M/2 × M/2 Hankel matrix, that equivalently can be written as the Pfaffian of a skew-symmetric M × M Toeplitz matrix. The M − 1 independent matrix elements of both matrices are Fourier coefficients of a certain symbol function, which is given by the ratio of two characteristic polynomials. These polynomials are associated to the different directions of the system, encode the respective boundary conditions, and are directly related through the symmetry of the considered Ising model under exchange of the two directions. The results can be generalized to other boundary conditions and are well suited for the analysis of finite-size scaling functions in the critical scaling limit using Szegő’s theorem.
Features of melting high-chromium flux-cored wire in pulsed arc welding
Authors: Davydov Yuri , Korobov Yuri , Davydov Alexander 
Published: June 2021

Abstract
The results of studies of the process of pulse-arc surfacing with flux-cored wire are presented. It is shown that with pulsed arc control, it is possible to increase the main parameters of the process to the values characteristic of a solid wire. The difference between the melting character of flux-cored and solid wire is shown.
Simulation of heat transfer in a flow of over-critical nitrogen and oxygen in a horizontal circular tube
Authors: Borodkin S V , Bataronov I L , Ivanov A V , Ryazhskikh V I 
Published: June 2021

Abstract
In the framework of the k-s turbulence model with enhanced wall treatment, heat transfer in a flow of over-critical nitrogen and oxygen in a horizontal circular tube with heat boundary conditions of the third kind in the pressure range of 20H40 MPa, mass flow rates of 0.03÷0.12 kg/s, and heat transfer coefficients to the environment of 500÷2000 W/(m2K) is simulated. The distributions of the bulk temperature, calculated as the thermodynamic temperature of the average mass enthalpy of the supercritical fluid flow, are obtained. Analysis of the heat transfer coefficient of the flow showed that at pressures less than three times the critical one, a reduced heat transfer mode appears, so the near-critical region is not recommended for use in oxygen and nitrogen gasifiers. In the framework of the multiplicative model for the Nusselt number, insignificant simplices of thermophysical properties are established and correlations for oxygen and nitrogen in the over-critical region are constructed, which agree with the result of the computational experiment with an average relative accuracy of 1^1.5%. On the basis of the one-dimensional heat transfer equation, the adequacy of the obtained correlations is shown. It is established that when using the bulk temperature based on the mass average enthalpy, a separate account of the initial heat transfer section is not required.
Calculation of the optimal power indicators for the engine of a small spacecraft
Authors: Podolskiy A , Volynets V , Knyazhev F , Begendzhov E , Guk A 
Published: June 2021

Abstract
The use of small space satellites is perspectively for the development of sciences, development of new technologies, conducting small engineering tests, and tracking global earth processes. In this article the main dependencies between various parameters of a small space satellite, which operates on outboard air, have been determined. It make possible to carry out its most optimal design. An assessment of the possibility of extrapolation in the calculations of a small number of thermalized particles to volumes close to the real number is carried out. The influence of changing the parameters of the air intake of the installation on the power of its engine and the friction force acting on the installation has been investigated. As a conclusion restrictions on engine parameters are given. They were reduced to a dependence on the diameter of the air intake.
The layout method is an effective method for creating a product design
Authors: Bazrov B M , Rodionova N A 
Published: June 2021

Abstract
The advantages of creating a product design by the layout method are shown. An example of using the layout method when creating modular machines is given. It is noted that the effectiveness of using the layout method largely depends on the quality of the element base; the characteristics of the element base are given. A methodological approach to the construction of element bases is proposed, including the division of the element base into two parts: the base of the main elements and the base of the auxiliary elements.
Traction mobile device for rotary tillage
Authors: Litvinova M M , Fedorchenko I S , Sukhenko N V 
Published: June 2021

Abstract
The organization of the territory of a forest nursery is the division of its territory into parts that have different economic purposes in order to make the most efficient use of the nursery area and ensure maximum mechanization of work. The establishment of a new nursery begins with the establishment of its outer boundaries. The most optimal shape of the nursery area is square or rectangular. The area of the nursery is divided by a network of main and secondary roads into branches, fields and quarters. The width of the main roads - main roads, circumferential and located perpendicular to the length of the side of the fields - should be 6-8 m, and the secondary ones, located along the long side of the fields, should be 3-6 m. The branch of the nursery is located taking into account the soil, relief and hydrological conditions. Plots with the best structure and granulometric composition of fertile soils, flat relief, protected from adverse effects of winds are allotted for the sowing department. The auxiliary area of the nursery is 25% of the useful area for large nurseries, 30 - for medium nurseries, 40% - for small nurseries.
Derivation of crack propagation velocity formula for investigation dynamic problems
Authors: Magomedov I A , Dzhabrailov Z A , Abubakarov M V 
Published: June 2021

Abstract
The following thesis will illustrate derivations of crack propagation’s formula for investigating brittle and elastic bodies. This work will look at the static and dynamic cases for crack initiation and propagation. Some approaches will be outlined in this work, which are the technics widely used in the field of mechanics for investigating the crack propagation and initiation related problems. At the end of the work crack propagation velocity formula will be derived.
Methods and models of traffic analysis
Authors: Shamlitskiy J I , Rogova D V , Polyakova A S , Popov A A , Lipinskiy L V 
Published: June 2021

Abstract
This article analyzes the traffic situation, and also discusses the methods of collecting data and how they are applied on the road. In addition, the advantages and disadvantages of the methods studied in the work are given. There is a separate talk about the Floating Car Data (FCD) method, what is the essence of the method, its advantages and disadvantages. In turn, the paper presents a difference in the approaches to using data collection methods, namely the Floating Car Data method on the use of the Global Positioning System in cars and the method based on telephone devices with a Global Positioning System signal. The average annual daily traffic is considered as one of the most important traffic data. Describes a way to implement the Floating Car Data method, the advantage in using and improving this method and the prospects of the method in the future.
Simulation modelling of the filling oil products process in the arctic zone using neural network forecasting
Authors: Grebnev Ya V , Moskalev A K 
Published: June 2021

Abstract
The intensification of the extraction of natural resources in the Arctic leads to an increase in the anthropogenic load on the environment. Due to wear and tear of equipment, corrosion of metals, mechanical damage, due to lack of proper maintenance and prolongation of the operating time in difficult climatic conditions, the operation of equipment used at enterprises leads to an increase in the risk of accidents. On the territory of the Russian Arctic, there are a number of large potentially dangerous objects, which have over 60 tanks for storing petroleum products. In 2020, there were technological accidents related to the bottling of petroleum products, which actualized the problem of taking prompt measures to prevent such emergencies. The methods for assessing the area of bottling of petroleum products currently used, especially in the Arctic zone, have a number of limitations. In the work with the use of the software product Toxy + risk, the risk of an emergency at one of the enterprises of the Russian Arctic was calculated. Neural network prediction of the area of pollution of the surface of the Kheta River was carried out using the NeuroPro neural network simulator. Comparison of the simulation results with the data obtained earlier in the analysis of the accident in the tank farm located beyond the Arctic Circle in the city of Norilsk.
Recognition of handwritten MNIST digits on low-memory 2 Kb RAM Arduino board using LogNNet reservoir neural network
Authors: Izotov Y A , Velichko A A , Ivshin A A , Novitskiy R E 
Published: June 2021

Abstract
The presented compact algorithm for recognizing handwritten digits of the MNIST database, created on the LogNNet reservoir neural network, reaches the recognition accuracy of 82%. The algorithm was tested on a low-memory Arduino board with 2 Kb static RAM low-power microcontroller. The dependences of the accuracy and time of image recognition on the number of neurons in the reservoir have been investigated. The memory allocation demonstrates that the algorithm stores all the necessary information in RAM without using additional data storage, and operates with original images without preliminary processing. The simple structure of the algorithm, with appropriate training, can be adapted for wide practical application, for example, for creating mobile biosensors for early diagnosis of adverse events in medicine. The study results are important for the implementation of artificial intelligence on peripheral constrained IoT devices and for edge computing.
Concealment of sensor network node interaction
Authors: Kushko E A , Parotkin N Y 
Published: June 2021

Abstract
The aim of this study is to increase the security of sensor network hosts by means of node interaction concealment. This paper outlines existing methods and approaches to information security of sensor network and internet of things systems. The authors developed a new secure data communication method based on dynamic network topology. This method allows to conceal sensor network data communication from an intruder breached an outer security perimeter. The new method secures data transfer and differs from the existing switching approaches that conceal sensor network hosts.