bluuebunny/crossref_metadata_2025 huggingface dataset:
Northern Sangtam phonetics, phonology and word list
Authors: Coupe Alexander R.
Published: March 2020

This paper presents a comprehensive phonetic and phonological description of Northern Sangtam, an essentially undescribed Tibeto-Burman language of central Nagaland belonging to the Aoic subgroup. It is a noteworthy language from a number of phonological perspectives, not least because its phoneme inventory contains two of the world’s rarest phonemes: a pre-stopped bilabial trill, and a doubly-articulated labial-coronal nasal. These unique segments are described in detail, and an attempt is made to determine how they might have developed their phonemic status. The tone system is also of interest, as it demonstrates evidence of debuccalization resulting in the development of a new high tone. Following a systematic description of the syllable and word structure, the tone system, and the segmental phonology, some observed age-related differences in the phoneme inventory are discussed. The paper is linked to an online repository containing the audio-visual data and transcribed word lists of approximately 900 items, based on the recorded utterances of eight speakers.
Improved effects of okara atomized by a water jet system on α-amylase inhibition and butyrate production by Roseburia intestinalis
Authors: Nagano Takao , Hirano Rika , Kurihara Shin , Nishinari Katsuyoshi
Published: March 2020

Improving the physicochemical properties of okara for various applications in foods is of great importance. Here, okara and microcrystalline cellulose (MCC) were atomized using a water jet (WJ) system. The WJ-treated okara and MCC dispersed homogeneously in water, and their median sizes in particle size distribution were 6.6 μm and 9.5 μm, respectively. The dispersions of WJ-treated okara and MCC showed high apparent viscosity and shear thinning behavior. Moreover, the inhibition of α-amylase activities by WJ-treated okara was more effective than that by untreated MCC and cellulose. Furthermore, the production of short-chain fatty acids by 32 dominant species of human gut microbes was determined. An increase in butyrate production by Roseburia intestinalis was observed in the presence of WJ-treated okara, but not in untreated okara or WJ-treated MCC. These results demonstrate that WJ system can be used on okara to increase inhibited α-amylase activities and butyrate production by gut microbiota.
Mechanical Characterization of PC-ABS Reinforced with CNT Nanocomposites developed by Fused Deposition Modelling
Authors: Tambrallimath Vijay , Keshavamurthy R. , Saravanabavan D. , Koppad Praveennath G , Sethuram D
Published: March 2020

Fused Deposition Modeling (FDM), a category of Additive Manufacturing (AM) is a versatile form of manufacturing technology that enables the development of the part layer by layer, of any complex geometry. The development and utilization of polymer nanocomposites for has seen a wide range of implementation. The development of polymer nanocomposite by fused deposition technology and evaluation of its mechanical propertieshave been carried out in this study. Polycarbonate (PC) and Acrylonotrile Butadiene Styrene (ABS) are compounded together with carbon nanotubes. Different proportion of Carbon Nano Tubes (CNT) was added as reinforcement at to PC-ABS matrix. Two variations of samples were developed with incremental addition of CNT to PC-ABS. Ultimate tensile strength and impact strength were analyzed for the developed nano composite FDM parts. It was observed that, with the addition of CNT the ultimate tensile strength of the parts increased significantly. Similar trend was seen for impact strength as well.
Photocatalytic of titanium dioxide hybrid polyurethane by miniemulsion polymerization
Authors: Metanawin Siripan , Kuntaradong Apichat , Thongsale Areeya , Metanawin Tanapak
Published: March 2020

Polyurethane nanoparticles were synthesized by using condensation miniemulsion polymerization. The miniemulsion technique was employed to produce nanoparticle in range 50 to 500 nm in diameter. 1,12-Dodecanediol and isophoronediisocyanate were polymerized in water base in the present of titanium dioxide (TiO2) from 1wt%-10wt%. The encapsulated-TiO2/Pu hybrids nanoparticles were obtained. The mechanical properties, morphology, crystal structure and photocatalytic activity of TiO2/Pu hybrids were investigated. The diameter of the hybrid particles were measured using dynamic light scattering. The results show that the hydrodynamic diameter of TiO2/Pu hybrids were in range 164nm-219nm. The morphology of TiO2/Pu hybrids were observed byscanning electron microscope. The SEM micrograph presented the well-defined structure. The crystal structures were analyzed by XRD. The photoactivity of TiO2/Pu hybrids-coated on nonwoven fabric presented the colorless of methylene blue solution.
Polyethylene Glycol Based Form Stable Composite Phase Change Material: A Review
Authors: Mishra Durgesh Kumar , Bhowmik Sumit , Pandey Krishna Murari
Published: March 2020

In the present study polyethylene glycol based form stable composite phase change materials have been reviewed. Due to different molecular weight of polyethylene glycol, it contains different melting temperature. So, it can be used at various engineering applications. But, less thermal conductivity and leakage during phase transformation hampers the utilization of polyethylene glycol. To overcome these huddles various researchers develops form stable composite kind of phase change material with the incorporation of porous material and thermal conductivity enhancing material. Thermal, physical and mechanical properties of the composite phase change materials were investigated by the different authors. A number of results indicated that with addition of different form stabilized material the thermal, chemical and mechanical properties have been improved.
Effect of Air-quenching on properties of CaO-Fe2O3 and CaO-B2O3 simulant materials for nuclear reactor
Authors: Jatav Sunil Kumar. , Pandey Vijay K. , Kulkarni Parimal P. , Nayak Arun K. , Pandel Upender. , Duchaniya Rajendra K.
Published: March 2020

In present study, the effect of Air-quenching on the properties of CaO-Fe2O3 (22:78 by wt. %) powder mixture and CaO-B2O3 (30:70 by wt. %) powder mixture was discussed. These materials are used in the nuclear industry as simulant material to study the melt coolability behavior. This study was carried out in order to development of CaO-Fe2O3 as a simulant material. The CaO-Fe2O3 and CaO-B2O3 powder mixture are melted in the Bottom pouring electric furnace then quenched in air. The quenched material have characterized through Field Emission Scanning Electron Microscopy (FE-SEM) with Energy-Dispersive X-Ray Spectroscopy (EDS), X-Ray Diffraction analysis (XRD), and Differential Scanning Calorimetry (DSC) analysis. The FE-SEM was used to study the morphology of the material after air quenching. The particles size analysis of air quenched material was performed macroscopically. The elemental analysis was carried out through the Electron Diffraction Spectroscopy. XRD analysis was carried out to determine the phases after air quenching. The density and porosity of these materials also have been calculated using Archimedes principle.
Tide-rainfall flood quotient: an incisive measure of comprehending a region’s response to storm-tide and pluvial flooding
Authors: Mohanty Mohit Prakash , Sherly Mazhuvanchery Avarachen , Ghosh Subimal , Karmakar Subhankar
Published: March 2020

It is undeniable that coastal regions worldwide are facing unprecedented damages from catastrophic floods attributable to storm-tide (tidal) and extreme rainfall (pluvial). For flood-risk assessment, although recognizing compound impact of these drivers is a conventional practice, the marginal/individual impacts cannot be overlooked. In this letter, we propose a new measure, Tide-Rainfall Flood Quotient (TRFQ), to quantify the driver-specific flood potential of a coastal region arising from storm-tide or rainfall. A set of inundation and hazard maps are derived through a series of numerical and hydrodynamic flood model simulations comprising of design rainfall and design storm-tide. These experiments are demonstrated on three different geographically diverse flood-affected coastal regions in India. The new measure throws light on existing knowledge gaps on the propensity of coastal flooding induced by the marginal/individual contribution of storm-tide and rainfall. It shall prove useful in rationalizing long-term flood management strategies customizable for storm-tide and pluvial dominated global coastal regions.
Performance Indicators of Textile Reverse Logistics
Authors: Ahlström F , Ferning C , Cheniere M K , Sorooshian S
Published: March 2020

The reverse supply chain has gained increased attention across industries due to the high product return rates. Many strategic and economic benefits can be reaped by efficiently managing the reverse supply chain, such as; cost reduction and enhanced environmental performance. Despite the acknowledgement of the available advantages that can be reaped, there is an overall lack of academic research concerning performance metrics, in particular KPIs (Key Performance Indicators), that can help in managing reverse supply chains. Moreover, industry-specific KPIs have not been explored thoroughly. The apparel industry is currently plagued by high return rates, which suggests that it is even more important for clothing retailers to look over their reverse supply chains. The conceptual framework presented in this report seeks to diminish the gap in literature and provide clothing retailers with KPIs with a focus on environmental sustainability that can help in the decision-making process. The framework is expected to promote sustainability as a more central decision-making criterion within reverse supply chains, especially within the apparel industry.
Design of Magnetic Circuit and Simulation of Magnetic Fluid Sealing with Three Magnetic Sources
Authors: Hao Fuxiang , Yang Xiaolong , Sun Peng
Published: March 2020

In order to obtain the maximum magnetic energy product in the sealing gap of the magnetic fluid sealing structure to improve the pressure capability of the magnetic fluid sealing, based on the magnetic circuit design theory and the magnetic fluid sealing theory, a parallel connection with three magnetic sources is provided. The magnetic fluid seal structure is designed for the magnetic circuit. The magnetic field in the magnetic fluid seal structure is calculated by the finite element method, and the pressure capability of the magnetic fluid seal is calculated. The results are analyzed and discussed. The results show that the magnetic flux leakage at the junction of the pole piece and the permanent magnet and the axial length of the intermediate pole pieces are short, which results in a nonlinear relationship between the magnetic induction strength difference between the two pole pieces and the sealing gap between the two pole pieces. The magnetic circuit method is lower than the magnetic fluid seal pressure capability calculated by the finite element method of the magnetic field.
Development of Simulator for Mine Dust and Disturbing Environment
Authors: Fang Yiming , Li Qing , Chen Zhemin , Tu Can
Published: March 2020

In order to explore the influence of interference factors on the light scattering dust detector, a spherical experimental cabin is developed, which can control the particle size, mass concentration distribution and relative humidity of dust. Combining with the fluid simulation experiment, the best method for rapid mixing dust is determined. The particle size, mass concentration and relative humidity of the dust are monitored and controlled by the sensor system inside the spherical cabin and the upper computer software. The wireless transmission between the sensor and the upper computer is realized. The control range of particle size is 0.5-10 μm, mass concentration is 0-10 mg/m3 and relative humidity is 5-85%.
Simulation Analysis of Experiment Vessel of Explosion-Proof Valve
Authors: Liu Hong , Hu wen-Hao , Shen Shao-Xiang
Published: March 2020

With the booming development of the shipbuilding industry, ship design process more and more attention to the design of marine diesel engine explosion-proof valve. However, the research on the explosion-proof valve has been stuck in the test of the state of the explosion gas outlet, and the relevant experimental data for the state of the explosion gas entering the explosion-proof valve is lacking. In this paper based on the CFD simulation platform, the explosion of the test vessel of the explosion-proof valve test system is simulated. And the explosion process of premixed gas in test vessel is effectively simulated by establishing the basic combustion model of gas combustion explosion, using the symmetry of the container, and giving the reasonable boundary conditions. The process simulation of gas explosion pressure data and pressure data measured by explosion experiments comparative analysis proved the reliability of the simulation results, provided the initial conditions for further study of the explosion-proof valve, a very important reference for the further study of the explosion-proof valve.
A Control System of Electric Wheelchair
Authors: Yang Weidong , Tang Yijiang , Wang Qiang , Lan Zhi , Su Honglun
Published: March 2020

This paper designs a control system for electric wheelchairs for electric wheelchairs, including: main controller, sensor module, power management module and auxiliary module, sensor module includes position sensor; power management module includes power supply and power self-starting device, The starting device acts as a power switch and is in a normally open state to disconnect the power supply. When the self-starting device is under pressure, the switch is closed and the power is turned on; after the system is powered on, the position sensor takes the seat position information of the electric wheelchair user in real time. Sending to the main controller, the main controller determines whether the user is in a safe position according to the received position information. If in the safe position, the main controller controls the power control module to supply power to the driving device of the wheelchair; if it is determined that the user is not in a safe position Then, the main controller controls the power control module to not supply power to the driving device of the wheelchair, and the main controller controls the voice module in the auxiliary module to issue a voice alarm signal that is not in a safe position. Through the system designed in this paper, the user’s safety and convenience are improved.
Research on Reverse Measuring Method of Screw Drill Rotor Based on Axis Section
Authors: Li Daqi , Wei Xuetong , Yang Lingyi , Song Yujie , Bi Dalong
Published: March 2020

The screw drilling tool is an important underground power tool in the oil fields. During the working process, the rotor will be damaged or unevenly worn. The repair and reuse of the damaged area of the rotor will greatly improve the utilization rate of the screw drilling tool and reduce the mining cost. To this end, based on the formation principle of the rotor surface of the five-head screw drill, the curve coordinates are described by the ray length and the rotation angle. The axis relationship equation is characterized by exploring the intrinsic relationship between the two coordinates, and the reverse model of a single screw drill rotor was constructed by point collection. At the same time, the experimental research was carried out to verify the feasibility of modeling the screw drilling tool according to the axial section. In order to provide an effective way to reverse the entire body based on the unworn area of the screw drilling tool, the inverse modeling theory of the spiral surface entity is greatly enriched.
Performance Analysis and Improvement of Gypsum Board Prepared from Desulfurized Gypsum with High Chloride Ion Content
Authors: Yin Dongjie , Wu Fade , Wang Ying , Wang Pengqi , Tan Danjun , Jian Ming , He Liang
Published: March 2020

Chloride ion has an important influence on the performance of gypsum board prepared by desulfurization gypsum, especially in wet environment. Therefore, this paper analyzed the influence of chloride ion on the bonding propertiesof gypsum board and studied the ways to improve the bonding properties of gypsum board prepared by desulfurization gypsum with higher chloride ion content. Porous mineral materials were introduced into the preparation of gypsum board. The effects of porous mineral materials on the bonding properties and other mechanical properties of gypsum board were studied and the results were analyzed. The results show that adding 1% porous mineral material to the desulfurization gypsum with higher chloride ion content can improve the wet-thermal bonding properties obviously, and has little effect on the mechanical properties of the board.
Study on Corrosion Resistance of Modified Concrete Grounding Materials
Authors: Wang Xianghan , Liu Rui , Tan Bo
Published: March 2020

Steel is widely used as a grounding material in power system, but it is easily corroded in the soil. To resolve the problem a new type of modified concrete composite has been developed. The modified concrete, added with carbon fiber, wrapped around carbon steel to form a composite to reduce the steel corrosion. Three corrosion comparison tests had been taken out. The corrosion test under three different pH soils show that the composite’s internal carbon steel’s corrosion rate is better than zinc-clad steel’s rate in all pH soils, and better than copper’s in soil with pH=5, also better than copper-clad steel’s in soil with pH=9. The typical area soil corrosion test shows that modified concrete can protect carbon steel in saline-alkali soil area and acid red soil area. The results of site-buried test show that modified concrete material can effectively reduce the corrosion of carbon steel in Tianjin saline soil. Those test results show that modified concrete, as external component, can protect internal carbon steel in various environments. The composite’s anti-corrosion effect is better other metals regularly used in grounding. The composite can be used in power system grounding, especially in corrosive areas such as saline-alkali area and acid red area.
Green Synthesis and Application of New Antioxidant 3052
Authors: Guo Jun-Lin , Tong Xi-Wang , Xin Ming , Yu Li-Ying , Ning Bo
Published: March 2020

A new synthetic antioxidant, 4-methyl-2-tert-butyl-6-(4-methyl-3-tert-butyl-2-hydroxybenzyl)phenyl acrylate (3052) was developed. Using solid phosgene as green acyl chloride reagent, DMF as initiator, acrylic acid and 2246 bisphenol as raw materials, two-component synthesis of antioxidant 4-methyl-2-tert-butyl-6-(4-methyl-3-tert-Butyl-2-hydroxybenzyl)phenyl ester. The experimental results show that under the optimized reaction conditions, the yield of 4-methyl-2-tert-butyl-6-(4-methyl-3-tert-butyl-2-hydroxybenzyl) phenyl ester is 85.6%. The purity is greater than 98%. The synthesis method has mild reaction conditions, short reaction time and high yield, and is 4-methyl-2-tert-butyl-6-(4-methyl-3-tert-butyl-2-hydroxybenzyl)phenyl ester. The synthesis of 3052 antioxidants provides a new approach.
The Grey Forecasting Model for the Medium-and Long-Term Load Forecasting
Authors: Song Feng , Liu Junxu , Zhang Tingting , Guo Jing , Tian Shuran , Xiong Dang
Published: March 2020

Load forecasting is an important part of system planning. In this paper, the medium - and long-term load forecasting method is studied, and the grey prediction is selected as the prediction method. Through the establishment of the grey prediction model and the posterior difference method to test the accuracy of the model, the gray forecasting model for the medium - and long-term load forecasting is presented, and the feasibility of this method is verified by an example.
Design of liquid level control system for double tank
Authors: Ye Junjie , Zhang Xiaoguang , Lv Chuanmao , Wang Puhao , Lv Haifeng
Published: March 2020

In order to control the liquid level in the chemical production process, a PID control theory algorithm is proposed. Firstly, by constructing a double-capacity water tank liquid level control system, the mathematical model of the double-capacity water tank was deduced and constructed through many experiments. The simulation was carried out by Matlab Simulink software, and the dynamic and static characteristics of the double tank water level control system were analyzed based on the simulation results. The Labview software was used to write the algorithm of the double tank water level control system. The USB-6008 data acquisition card and the DAQ data acquisition assistant were used to complete the connection of the experimental hardware and software. The actual liquid level curve was obtained through experiments. The experimental results show that the designed system can keep the liquid level of the lower tank of the double tank level within the set value, and the floating does not exceed 5%, which achieves the predetermined steady state effect.
Design and control of condom delivery system
Authors: Chen Zhifeng , Liu Xiaogang , Sun Hong , Gao Xiulong , Wang Jian
Published: March 2020

At present, in the domestic condom manufacturing industry, the method of the pin hole detection of the condom is the electric test, and because of the uncertainty of the attitude before the electric test of the condom, the automatic electric test can not be carried out. In order to solve the attitude and order of the condom, the automatic electric test is realized. In this paper, a transfer system based on the Mitsubishi PLC controller is put forward based on the physical property of the condom, and the mutual action of the various sensors and the air cylinder is used to achieve the aim of the research. The delivery system solves the problem of disorder and overlap of condoms, realizes automatic detection, reduces labor cost, and provides an effective system for the transportation of flexible materials.
Research on ultrasonic guided wave dispersion compensation for steel strand defect detection
Authors: Zhao Molin , Wang Haisheng , Xue Bin , Yue Yonggang , Zhang Pengfei , Lv Fuzai , Tang Zhifeng
Published: March 2020

Ultrasonic guided waves detection technology is a new nondestructive testing technology, and it can be used to detect the structural health of steel strands. Because of dispersion separation, it has great impact on the detection results, especially in long distance detection. This paper introduces a method of linear mapping technique for dispersion compensation. The effect of dispersion compensation can be achieved by reconstructing the linear dispersion curve instead of the nonlinear dispersion curve. This paper verifies the processing effect of dispersion compensation method from simulation and experiment while using a single-core rod as an example, and applies this method to the detection signal of steel strand. The results show that the method can focus the guided wave signal, and improve positioning accuracy and signal-to-noise ratio of detection.
Graphical User Interface for Ultrasound Guided Wave Imaging
Authors: Liu Wenlong , Zhang Yinghong , Nie Yalong , Hu Zhiyi
Published: March 2020

In order to more accurately grasp the exact shape, contour size and distribution of defects in the plate-like structures material and other detailed feature information, this paper designed the graphical user interface GUIGWT0.1, which is specifically used for ultrasonic guided wave imaging. This software integrates filtering back projection algorithm, damage probability reconstruction algorithm and diffraction tomography algorithm, which can image the plate-like structures structure as required, and develop the defect detection results to the visual direction. To investigate the validity of the interface, the projection data of lamb wave in the plate-like with a partial-thickness notch are numerically simulated by three-dimensional elastodynamic finite integration technique (EFIT). The resulting projected data is imported into the graphical user interface for imaging. For each existing reconstruction imaging, the result can be represented in terms of grayscale image of projected data, defect imaging, image color inversion and false color defect recognition. Through simple operation, reconstruction of image with defect of plate-like structure are obtained in the user interface.
Study on numerical simulation of gas pipeline speed regulating detector
Authors: Li Xiaolong , Meng Tao , Ma Yilai , Tan Zheng , Chen Jinzhong
Published: March 2020

In order to control the running speed of the detector in the gas pipeline, the flow field calculation method of the detector in the gas pipeline under the discharge state is studied. Based on the operating principle of the detector in the gas pipeline, the model of the discharge hole of the detector is constructed by using the standard orifice flowmeter. Based on computational fluid dynamics theory, the application of computational fluid dynamics software ICEM CFD and provided ANSYS CFX to generate flow field model and a numerical simulation was carried out, with fluid flowing through the discharge of the flow field simulation, the discharge state of gas pipeline detector in flow field, achieved under different aperture of gas flowing through the standard orifice plate before and after the pressure field, velocity field of numerical analysis. The results show that using the standard hole as the detector model in the gas pipeline under the discharge state has certain guidance, and it is of certain significance to further study the velocity control problem of the detector in the gas pipeline.
Research on Computer Network Security Analysis Modeling Based on Artificial Intelligence Technology
Authors: Huang Yan
Published: March 2020

With the development of network technology, network is more and more closely related to people’s lives. Network security has been paid more and more attention, and the research on network security has gradually been put on the agenda. The main purpose of computer network security research is to extract the system data and factors related to computer network security and establish a model to analyze computer network security. Computer security concerns people’s vital interests. Now, hacker attacks and virus intrusions often occur, which threaten people’s privacy and security. The research work of security analysis needs to extract the system resources and security factors related to computer network security and establish a security model oriented to security analysis. Based on the analysis of the connotation and current situation of computer network security, this paper points out the main problems existing in the network security model, in order to explore a practical model for improving computer network security analysis.
Research on Design and Experience of Immersive Virtual Reality Psychological Relaxation Game Based on Image
Authors: Wang Zhen , Xu Hengsuo , Yuan Hongliang
Published: March 2020

With the continuous progress of digital media technology and the rapid development of the game entertainment industry, people have put forward more demands on the display mode and immersion of games. Immersive stereoscopic display game based on game engine supports multi-machine and multi-projection display under various display environments, and has good stereoscopic effect and immersion feeling. The effect of psychological relaxation is highly related to immersive virtual reality environment. The relaxing effect in immersive environment is better than that in non-immersive environment. The more immersive the environment, the stronger the sense of presence, and the better the relaxing effect. With the improvement of virtual reality technology and the popularity of equipment, it provides a convenient and feasible way for the general public to obtain self-discipline of psychological relaxation. The effect of psychological relaxation is highly correlated with the immersive virtual reality environment. The relaxation effect in the immersive environment is better than that in the non-immersive environment. The more immersive the environment, the stronger the sense of presence and the better the relaxation effect.
Design and Application of Intelligent Greenhouse Information Management System Based on Hybrid Architecture
Authors: Su Chang , Yang Chao , Hu Lina , Tian Chong
Published: March 2020

In order In order for real-time greenhouse information management system to be applied in both local area network and wide area network, an intelligent greenhouse information management system based on C/S and B/S hybrid architecture, is designed. In the intelligent greenhouse information management system, factors like temperature, humidity, light intensity and CO2 concentration are considered, so that the greenhouse crops can grow in appropriate environment, to yield good economic benefits. Compared with the traditional greenhouse information management system, the system can monitor the main factors such as temperature, humidity, light intensity and CO2 concentration in the greenhouse. At the same time, customers can monitor the real-time conditions in the greenhouse and exercise real-time control, as long as the Internet is available.
Research on the Product Development Process of the Elderly Based on the Concept of Design Industrialization
Authors: Yang Meng , Lv Yanying
Published: March 2020

Design industrialization refers to the deep integration of design into other industries in order to drive the development of enterprises by design innovation and open the whole industrial chain. The design industry chain includes product development, production and processing, logistics transportation, promotion and sales, which is different from the traditional design service industry and extends a single design field. Design industrialization is a system that takes innovation drive as the core, satisfies customers’ needs as the goal and promotes sales as the motive force. It can make up for the defects of traditional design industry and create a brand-new concept of product design promotion. This paper takes the design industrialization system as the research direction, relying on the aged products, redesigns the development process of the aged products, and explores the practice and application of the design industrialization system in product design.
A Deep Research in Classic Classification Network
Authors: He Hanyue
Published: March 2020

This article is a further study and reflection of the classification network after the completion of the article “The Comparison and Analysis of Classic Convolutional Neural Network in the Field of Computer Vision”. Different from previous work comparing network performance of VGGNet and ResNet, this paper compares and analyzes the importance of depth, breadth and residual learning of GoogLeNet and ResNet in convolutional neural networks. And considering that most of the time, the basic classification network nowadays appears in the form of backbone in the detection and segmentation network, this paper compares the advantages and disadvantages of several major classification networks as backbones.
A design of alternating magnetic field analysis and storage module based on embedded MCU
Authors: Leng Jie , Fu Yibo , Zhao Zhe
Published: March 2020

Aiming at the demand of low frequency alternating magnetic field signal extraction function in the background of marine environment, a set of low frequency alternating magnetic field signal processing and storage module is designed based on embedded MCU. The module uses a FatFs file system and a micro SD card with spectrum analysis and line spectrum extraction. Finally, the function of the module was verified by data simulation and Helmholtz coil test.
Research on the Effectiveness and Operability of Urban and Rural Planning Implementation Evaluation Based on Ecological Environment
Authors: Zhao Lu , Li Chengying
Published: March 2020

At present, the implementation evaluation of urban and rural planning has some problems, such as poor standardization, insufficient subjective cognition, and lack of methodology, which make it difficult to carry out effectively. This paper discusses how to improve the effectiveness and operability of the implementation evaluation of urban and rural planning from three aspects: the evaluation content system, the evaluation organization and method, and the result judgment. Based on the basic concepts of urban and rural planning management and urban ecological environment, this paper analyzes the existing problems of urban ecological environment and urban and rural planning management, as well as the relationship between planning management and urban ecological environment. On this basis, the connotation of eco-city was discussed, and the idea of implementing steps for building eco-city and countryside planning was put forward, so as to promote the development of eco-city and countryside planning and eco-city and countryside construction in China.
Optimization of the Circuit Parameter in Class-E Power Amplifier in the Two-coil Wireless Power Transfer System
Authors: Sun Zhuang , Liu Qing , Li Kun , Hu Bin , Zhao Haibo , Shi Yankai , Zhang Shijie , Liu Yang
Published: March 2020

In this paper, the circuit parameters of the Class-E power amplifier are investigated and optimized to achieve the maximum of output power and efficiency in a two-coil Wireless Power Transfer (WPT) system. The circuit is simulated with software named Saber. Working frequency, the value of capacitors and inductor, which has relationship with the output power and efficiency, are investigated during the simulation. With the simulation results, it is found that the frequency and the shunt capacitor need to be optimized for high performance of the wireless power transfer system.
Study on the dynamic relationship between environmental pollution control and tourism economic growth -- a case study of China
Authors: Wang Wei
Published: March 2020

Environmental pollution control is closely related to the growth of tourism economy. Based on relevant data of China from 2000 to 2017, a vector error correction model was established to test the dynamic relationship between investment in environmental pollution control and tourism economic growth in China. The results show that there is a co-integration relationship between investment in environmental pollution control and tourism economic growth. Through impulse response and variance decomposition analysis, it is found that the fluctuation of tourism economic growth is mainly affected by investment in environmental pollution control. According to the result of causality test, investment in environmental pollution control is the gran cause of tourism economic growth. Therefore, in order to play a role of environmental pollution control investment in promoting the growth of tourism economy, on the one hand, we should attach importance to the improvement of laws and regulations related to tourism environmental protection, on the other hand, we should improve the investment mechanism of environmental protection, and finally, we should strengthen the supervision system of environmental protection and the construction of environmental protection agencies.
Study on the main biochemical components of CH-1 and the suitability of green tea
Authors: Tan Xiao-Qin , Huang Jia-Cheng , Fan Hong-Li , Tang Qian
Published: March 2020

In this experiment, CH-1 was used as material to study its main biochemical components and the suitability of green tea. The results showed that the content of the water extract, caffeine and tea polyphenols in CH-1 were significantly higher than those in FD, which were higher 0.44%~12.29%, 3.03%~7.05%, 11.39%~20.46%, respectively. A lower level of amino acid but a proper phenol-ammonia ratio of catechins in CH-1 contributed to a good quality of green tea made by CH-1, which was consistent with the results of sensory evaluation.
Anti-browning in Tissue Culture of ‘Donghong’ Kiwifruit
Authors: Sui Liyun , Kong Lingling , Liu Xiaomin , Zhang Yong
Published: March 2020

The bud stem segment of ‘Donghong’ kiwifruit was selected to study the anti-browning problem in kiwifruit tissue culture. The effects of different antioxidants and adsorbents added to the culture medium and cold treatment on the browning of explants in vitro were studied. The results showed that except for cold treatment at 4°C for 24 h, other treatments could effectively reduce the browning rate of explants. Among them, the addition of citric acid(CA) to the medium had the best anti-browning effect, and the browning phenomenon did not occur in the treatment of 0.5 mg/L of CA, but the axillary bud germination rate of the stem segment was low. Polyvinylpyrrolidone(PVP) and activated carbon(AC) were added to the medium to have a high germination rate. When the concentration of PVP was 300 mg/L, the germination rate was the highest, reaching 50.00%, and the browning rate was 30.00%. In general, the addition of 300 mg/L of PVP to the culture medium was the optimal treatment in the tissue culture of ‘Donghong’ kiwifruit.
System Dynamics Simulation Research on Ship Emission Control Area Policy
Authors: Wang Zheng , Liu Ying , Qin Cui-Hong , Zhang Wei
Published: March 2020

The ship emission control area policy involves multiple stakeholders. This paper studies the behavior selection and its influencing factors of the maritime administrative department and shipping enterprises in the policy implementation, and constructs the system dynamics model of the evolutionary game of the ship emission control area policy. The model is used to analyze the dynamic impact of different fuel costs on the strategic choices of both parties in policy implementation. The results show that the cost of low-sulfur oil has a significant impact on the behavior of shipping companies. The government management department should reasonably formulate relevant incentive policies and fuel oil supply guarantee mechanisms to ensure the smooth implementation of the ship emission control area policy.
Application of Data Mining Method Based on Integrated Learning in Early Warning Research of SMEs’ Financial Crisis
Authors: Yan Yanxu
Published: March 2020

Due to the reasons of irrational capital structure, non-standard management methods and imperfect internal control system, it directly leads to the weaker anti-risk ability of Chinese SMEs. When various environments deteriorate, it is difficult for SMEs to be able to cope with the resulting risks. Based on the characteristics of listed companies in SMEs and the particularity of the causes of financial crisis, this article focuses on cash flow indicators and selects initial financial indicators. The clustering center is initialized based on the optimized K-means++ clustering algorithm to obtain better clustering results, and the classification effect is evaluated using the contour map. The number of clusters is determined as three types and four types through multiple experiments and comparisons, which works better.
Construction of 3d Model of Complex Geological Structure Deposits under Big Data
Authors: Xue Xiaogang , Bi Mingli , Li Caihong , Chen Guoqiang
Published: March 2020

The traditional mining hand-drawn graphics were slow, inefficient, and the use of two-dimensional CAD graphics to display three-dimensional space was obviously not strong, and it was easy to misunderstand. To this end, a three-dimensional model of complex geological structure deposits under big data was constructed, and a complex geological structure deposit database was established to provide diversified information; CD-TIN technology was used to generate one-time constraint TIN, for saving time in fabricting; Extracting the structure of the deposit and standardizing the original geological map to construct a three-dimensional model of the complex geological structure deposit under the big data; Through experimental research and analysis, the proposed three-dimensional model of complex geological structure deposits under the big data realized the establishment and visualization of the deposit model, which was highly feasible, improved the speed and efficiency of the deposit space model, and had high definition with an increase of 38% over traditional methods.
Influence of loading rate on strength characteristics of ultra high molecular weight polyethylene (UHMWPE)
Authors: Demiyanushko I V , Nadezhdin V S , Gruzdev A S , Titov O V
Published: March 2020

Modern digital modeling of dynamic processes is impossible without verified models of materials. However, when creating a material model, it is necessary to consider the possibility of changing properties depending on the loading rate. In this paper we consider the influence of loading rate on the strength characteristics of modern polymer material – ultrahigh molecular weight polyethylene (UHMWPE).
Automatic prediction of the fatigue crack trajectory in plane finite element models
Authors: Matrosova E A , Sergienko V V , Egorov G P , Sadikov D A
Published: March 2020

A module for automatic prediction of the fatigue crack trajectory in plane finite-element models in Ansys APDL software package was developed. Crack propagation is modeled by exclusion of elements from the active set in the direction, which is determined based on criterion of the maximum energy flux to the crack tip. The module determines the parameters of fracture mechanics (stress intensity factor and J-integral) at each step of crack propagation.
Modelling of gears for nonlinear dynamics analysis
Authors: Popov V V , Sorokin F D
Published: March 2020

The model of gear pair for three dimension nonlinear transient analysis is proposed in the article. The model of gear pair is capable of representing a wide spectra of gear types used in industry. Variable gear mesh stiffness, gear mesh damping, transmission errors and backlash are introduced in the model.
Elastoplastic buckling of a cylindrical shell with initial geometric imperfections and an elastic filler at external pressure
Authors: Samsonova D A , Bazhenov V G , Nagornykh E V
Published: March 2020

A technique has been developed for the numerical calculation of deformation and elastoplastic stability loss nonlinear problems rotating shells based on the Tymoshenko hypotheses for nonshallow shells taking into account geometric nonlinearities. Kinematic relations are formulated in velocities and constructed in the current status metric taking into account large deformations, displacements and rotation angles of shell elements. plastic flow theory with nonlinear isotropic hardening describes physical relations. The motion equations result from the virtual working power balance. Winkler foundation models the revolution shell and the elastic filler contact interaction. The numerical calculation is based on an explicit “cross” type mesh scheme. The dependence of the elastoplastic revolution shell stability loss form and the load critical value on the filler stiffness under various values of the initial imperfections amplitude was studied.
Experimental investigation of elastic properties degradation in aluminum samples under cyclic loading
Authors: Torgovanov A O , Moskvitin G V
Published: March 2020

This research focuses on experimental study of fatigue resistance to vibration. At this time, there are no absolute criteria to accurately estimate fatigue of one or another structure despite the significant amount of studies in this area. A method for predicting the remaining life by studying the changes in the first self-resonant frequency of an aluminum sample depending on the number of loading cycles.
Antifriction wear-resistant coatings process development for sliding bearing friction surfaces of submersible pumps
Authors: Arkhipov V E , Pugachev M S , Zh Sakhvadze G
Published: March 2020

The tribotechnical coating structure using a mechanical mixture of copper and zinc particles obtained over a wide temperature range of air flow under ultra-high-speed gas-dynamic spraying is studied. Comparative tests were carried out to assess the tribotechnical properties of various composition gas-dynamic coatings and industrial compact antifriction alloys, which showed the advantage of gas-dynamic coatings of copper-zinc-corundum composition. The antifriction wear-resistant coatings production process by cold gas spraying can be recommended for sliding bearings of submersible pumps.
The definition of longitudinal forces in the rail by changing its eigen frequency
Authors: Chunin S V , Shabunevich V I , Akashev M G
Published: March 2020

The article discusses methods to evaluate the longitudinal stress level in the rail formed as a result of the thermal expansion of the continuous welded rail track. The comparative analysis of results of bench and field tests, as well as the verification of the mathematical model of the track section, have been performed.
Numerical analysis of forced vibrations of the Golden Gate suspension bridge in the case of the 1:1 internal resonance
Authors: Katembo A L , Kandu V V , Shitikova M V
Published: March 2020

Nonlinear force driven coupled vertical and torsional vibrations of suspension bridges, when the frequency of an external force is approaching one of the natural frequencies of the suspension system, which, in its turn, undergoes the conditions of the one-to-one internal resonance, are investigated. The generalized method of multiple time-scales is used as the method of solution. The damping characteristics are described by the rheological model involving a fractional derivative, which is interpreted as a fractional power of the differentiation operator. The main subject of this research is the numerical analysis of the influence of the fractional damping on the dynamic behavior of a suspension combined system.
Contact interaction of NEMS shell elements in a color noise field
Authors: Papkova I V , Yu Krylova E , Krysko A V
Published: March 2020

A mathematical model of behavior a spherical size-dependent shell and plate taking into account contact interaction is constructed. The effect of the color noise field on the mechanical system is taken into account. The following hypotheses were taken as initial hypotheses: the shell and plate material is isotropic, the Cosserat elastic pseudo-continuum with constrained particle rotation, and the Kirchhoff – Love kinematic model. The equations of motion are obtained on the basis of the following theories: Theodore von Karman (geometric non-linearity), B.Ya.Cantor theory (accounting for contact interaction).
Nanosized iron-substituted hydroxyapatites
Authors: Fadeeva I V , Selezneva I I , Davydova G A , Fomin A S , Gafurov M R , Barinov S M , Poltavtsev A M , Davydova I B , Zaraisky E I , Poltavtseva R A
Published: March 2020

Introduction of iron ions into hydroxyapatites imparts some useful properties to ceramic materials. We created a porous ceramic material from nanosized iron-substituted HA and studied its physico-chemical and biological properties. It is shown that all the iron ions introduced in the course of synthesis enter into the composition of HA and are characterized by the oxidation state +3. The size of crystals after thermal treatment at 9000 C does not exceed 100 nm, the crystals’ shape is close to a sphere. Porous materials from nanosized iron-substituted hydroxyapatites support adhesion and growth of anchorage-dependent cells of mammals.