bluuebunny/crossref_metadata_2025 huggingface dataset:
Human fall recognition based on WiFi CSI with dynamic subcarrier extraction of interference index
Authors: Zhou Yichao , Gao Ming , Luo Yunxiao , Fan Xianglin
Published: April 2021

Recently, human fall recognition based on channel state information(CSI) were emerging technologies. However, the widespread deployment of WiFi may cause wireless interference problems for such WiFi CSI recognition, which will reduce the accuracy of human fall activity recognition. So, the paper proposed a dynamic subcarrier extraction method based on interference index (CII-DSE). It used the interference index to divide the interference level and determined the corresponding weak correlation subcarrier combination to reduce the presence of channel interference. Experiment results shown that in the WiFi overlapping channel interference environment, the accuracy of CII-DSE was 95. 8%, which effectively improves human the fall recognition influence.
Rigidity of conformal minimal two-spheres in a compact symmetric space
Authors: Yi Min
Published: April 2021

In this paper we studied rigidity of submanifolds, rigidity is an important property of submanifolds in differential geometry. Then we manily proved that any conformal minimal two-sphere immersed in a compact symmetric space N is determined, up to an isometry of N, Byits first and second fundamental forms.
Man-Machine Translation—Future of Computer-Assisted Translation
Authors: Aihua Zhu
Published: April 2021

The development of artificial intelligence has given birth to machine translation, which greatly improves translation efficiency. However, the quality of machine translation is not satisfactory, especially in terms of proprietary terms, cultural vocabulary, and text logic. Human-machine translation has become an innovative product of computer-assisted translation, which automatically saves corpus modified or stored by the translator and grows together with it, constituting a unique translation library. After that the machine can automatically identify and retrieve the correct translation in subsequent translation practices, maintaining quality while ensuring quantity and improving translation efficiency.
Experimental research on Ferrofluid Combined rotary Sealing of High Power Motor
Authors: Xing Feifei , Ruican Hao , Ji Jun
Published: April 2021

It was designed a ferrofluid combined rotary sealing structure for a high power motor in this paper. In addition, it was calculated the magnetic field distribution of the structure by Ansys at different gaps, the result showed that the magnetic field distribution trend was generally the same. In the sealing experiment, it was concluded that when the maximum gap was 0.6mm, the single-stage sealing pressure capacity reached at 36.7KPa, and the sealing capacity remained stable with speed increasing. The experiments showed that the design was suitable for sealing high-power motors in corrosive environments.
Application of Microelectronics Computer Auxiliary Function under the Internet of Things Platform
Authors: Xiaojiang Li
Published: April 2021

With the continuous deepening of economic globalization, the pressure of market competition faced by all walks of life is increasing day by day. If it occupies a place in the fierce market competition, it must continuously improve technological level and technical content. Nowadays, science and technology have become an important standard to measure a country’s comprehensive strength and development status, and the improvement of science and technology has also risen to the level of national development strategy. As the core of all high-tech technologies, microelectronics technology can turn some unreachable technological products into reality. Combining it with the Internet of Things, it will help lay a solid foundation for technological innovation. Therefore, this article analyzes the concepts of Internet of Things and microelectronic computers, and deeply studies the meaning of the combination of the two. At the same time, it expounds the application of microelectronic computer auxiliary functions under the Internet of Things platform, hoping to provide references for professionals.
Numerical calculation for effectively simulating the electric field in electroporated tissue
Authors: Xu Xu , Yi Zhang , Yang Lei
Published: April 2021

At present, cell membrane perforation technology has been widely used in biology and clinical medicine. Therefore, it is important to master the change pattern of perforated cell membrane potential to further improve the research and application of cell perforation technology. Among them, numerical simulation is an important tool to noninvasively study the effects of tissue properties, electrode arrangement and pulse transmission scheme during electroporation. In this paper, an improved Newton’s method is used to predict pulse voltages and to verify the fit of the method used in this paper for different tissue parameters in a numerical computational model developed specifically for electroporation. The purpose is to improve the reference for researchers to provide faster and more accurate iterative algorithms when studying the electroporation mechanism. The comparative analysis of simulation results between this paper and COMSOL software shows that the method can improve the accuracy of predicting the electric field distribution, reduce the number of iterations, and the effect is well fitted under different tissue parameters. We believe that this knowledge will contribute to a better understanding of in vivo electroporation kinetics and improve electroporation treatment planning techniques.
Non-invasive electric arc fault detection based on sliding approximate entropy
Authors: Liu Zhao , Cao Xuewei , Wang Ziyang , Li Jinshun , Chen Xiaokai
Published: April 2021

In recent years, electrical fires have occurred frequently and have become the first cause of various fires. Among them, the electric arc is one of the important causes of electrical fires. In this paper, the research on non-invasive electric arc fault detection is carried out for low-voltage users, which can discover and detect the electric arc only by analysing the aggregated current measurements from outdoors. In order to achieve this goal, firstly, the abrupt change of the current mode is discovered and detected with sliding window from the total load current signal based on the approximate entropy. Then the current signature samples are extracted around the abrupt change. Finally, according to the pre-set electric arc signature classifier, it is judged whether the abrupt change is caused by the electric arc fault. In addition, under laboratory conditions, an electric arc simulation experiment is carried out for common appliances of actual low-voltage users. The results show the effectiveness of the proposed non-invasive electric arc fault detection method based on approximate entropy.
Effective Computer-assisted Terminology Management Through SDL MultiTerm
Authors: Yang Zhengang
Published: April 2021

Long term changes have been brought about by information and computer technology to translation activity in the information age. Meanwhile, technical translation service demand is increasing, so new strategies and methods are needed to adapt to the change in translation activity. Computer-assisted terminology management tool plays an increasing important role in translation industry, attracting more and more research focus. The paper expounds the forms and significance of terminology management, with special emphasis on SDL MultiTerm. The paper argues that terminology work, also a form of collaborative team work interlinked with the whole translation process, will be further facilitated by computer and information technology to ensure quality translation service.
The Conception of Application of Computer Virtual Reality Technology in Sports Training
Authors: Ren Yue , Li Jianchen
Published: April 2021

In recent years, with the rapid development of the economy and the rapid progress of science and technology, computer technology has also made great progress, and the computing power of the computer has been improved unprecedentedly. The progress of computer technology has also brought technological innovation and new human-computer interaction experience, and a large number of frontier technology has emerged in the field of computer. Virtual reality technology is one of the outstanding representatives. At present, virtual reality technology has been applied in many industries and has played an important role. Athletic sports will also be promoted by the spirit of “science and technology to serve the Olympic Games” of the State Sports Administration. Among them, all kinds of advanced sports science and technology, including virtual reality technology, will also penetrate the daily training and scientific research of competitive sports, and provide scientific and technological support for coaches and athletes in various sports to create better results. Therefore, this paper will focus on the advantages of virtual reality technology, and study the possibility of combining virtual reality technology with the training of many competitive sports events. So as to promote the development of the physical education industry, bring fundamental changes, and promote the progress of sports in China.
Research on trajectory tracking of unmanned vehicle based on model predictive control
Authors: Liu Zheng , Kang Haiyang
Published: April 2021

Trajectory tracking control is a key technology in the research and development of autonomous vehicles. In view of the fact that the traditional model predictive control (MPC) method does not consider the interaction of longitudinal and lateral forces in the trajectory tracking control of unmanned vehicle, a vehicle trajectory tracking control method based on model prediction is proposed. Considering the longitudinal and lateral coupling of tire force, a more accurate tire force model and dynamic model are obtained. Besides a variety of constraints such as control quantity, control increment and output are added. The co-simulation platform CarSim / Matlab / Simulink is used to verify the designed controller by taking the four-wheel front steering vehicle. The results show that the track tracking process is stable and reliable under the condition of double lane change and the tracking effect of vehicle to reference track is very ideal.
Design and Application of Automatic Dust-free Convey Equipment for Heavy Medium Solid Material on Offshore Drilling Platform
Authors: Xiaolong Lian , Hongli Liu , Bo Zhou , lin Hou
Published: April 2021

The Yingqiong Basin, a large high-temperature and high-pressure gas field in the South China Sea, is one of the three high-temperature and high-pressure areas in the world. According to incomplete statistics, from 1984 to 2013, a total of 30 high-temperature and high-pressure exploration Wells were drilled in the South China Sea. According to the drilling situation, there were 4 ultra-high temperature and high-pressure Wells with temperatures over 200°C and mud gravity over 2.20sg. With the increasing demand for oil and gas in China, the drilling operations of HP/HT Wells are also increasing, which is the inevitable trend of the development of oil and gas drilling technology. Due to the high pressure of Wells, drilling fluid need to be weighted by additives during cementing operations. In the past, these operations on offshore platforms were all done by manual. Therefore, we developed a set of positive-negative pressure conversion type continuous conveying device which integrated a weight medium negative pressure cutting device. The device consists of negative pressure dust-free feeding system, negative pressure conveying system, positive and negative pressure continuous conveying system, dust removal system and automatic control and detection system. It can realize flexible pipeline transmission through negative pressure and positive pressure. The device contains a variety of detectors to detect the operation situation in real time, and the control system can realize the functions of automatic control and automatic fault alarm. The results of experiment and field application show that the device can meet the high demand of heavy medium transportation.
Aerodynamic effects on an emulated hovering passerine with different wing-folding amplitudes
Authors: Chen Wei-Han , Yeh Szu-I
Published: April 2021

Bird flight involves complicated wing kinematics, especially during hovering flight. The detailed aerodynamic effects of wings with higher degrees of freedom (DOFs) remain to be further investigated. Therefore, we designed a novel multiarticulate flapping-wing robot with five DOFs on each wing. Using this robot we aimed to investigate the more complicated wing kinematics of birds, which are usually difficult to test and analyze. In this study the robot was programmed to mimic the previously observed hovering motion of passerines, and force measurements and particle image velocimetry experiments. We experimented with two different wing-folding amplitudes: one with a larger folding amplitude, similar to that of real passerines, and one with only half the amplitude. The robot kinematics were verified utilizing direct linear transformation, which confirmed that the wing trajectories had an acceptable correlation with the desired motion. According to the lift force measurements, four phases of the wingbeat cycle were characterized and elaborated through camera images and flow visualization. We found that the reduction in folding amplitude caused a higher negative force during upstrokes and also induced a greater positive force at the initial downstroke through ‘wake capture’. This could increase the vertical oscillation while hovering despite a minor increase in average force production. This phenomenon was not observed during forward flight in previous studies. Our results provide a critical understanding of the effect of wing folding which is required for designing the wing kinematics of future advanced flapping-wing micro aerial vehicles.
An emerging impact of Eurasian spring snow cover on summer rainfall in Eastern China
Authors: Zhang Taotao , Wang Tao , Feng Yingying , Li Xichen , Krinner Gerhard
Published: April 2021

Eurasian spring snow cover is widely considered as an important predictor of Asian summer monsoon rainfall, but its possible role in the formation of the north–south dipole structure of rainfall anomalies (NSDR)—a major mode of the eastern China summer rainfall variability—remains elusive. Here, we show that, there is a close connection between the western Eurasian spring snow cover (WESS) and NSDR during our research period 1967–2018, with less WESS tends to be accompanied by a wetter south-drier north pattern over eastern China, and vice versa. However, this relationship was not significant before the late 1990s, but has since become significant. Further analyses demonstrate that the shift in the WESS–NSDR relationship could be attributed to the modulation of summer North Atlantic Oscillation (SNAO). After the late 1990s, the WESS-related anomalous atmospheric circulations during summer are largely reinforced by the constructive superposition of those with same signs induced by SNAO, which in turn would intensify the impact of WESS and hence lead to a strong WESS–NSDR connection. In contrast, the influences of WESS are counteracted by those with opposite signs associated with SNAO before the late 1990s and thereby result in a weak snow–rainfall relationship. Our findings, along with the decline in Eurasian spring snow cover, provide a potential explanation for the recent ‘South Flood–North Drought’ pattern observed over eastern China.
Review of 3D digital core reconstruction methods for deep shale gas reservoir
Authors: Liu Yuejiao , Lai Fuqiang , Kou Xiaopan , Wang Yifei , Wang Haitao , Zhao Xiaotian , Tan Zhoujie
Published: April 2021

Conventional digital core reconstruction methods are not suitable for deep shale gas reservoirs with low porosity and permeability, anisotropy and complex mineral composition, and conventional single resolution three-dimensional digital core structure model cannot fully describe the core structure of shale gas reservoirs of different scales. In this paper, the advantages and disadvantages of different digital core reconstruction methods are summarized by analyzing examples. It is found that MCMC core reconstruction method is more suitable for image reconstruction of 3D digital structure model core of deep shale gas reservoir in China; Finally, in view of the problems existing in conventional digital core reconstruction methods, combining CT imaging with ion beam focused electron microscopy (FIB-SEM) imaging technology, a 3D digital core structure model with multi-scale, multi-component and corresponding macro pore and micro pore of the corresponding reservoir is proposed. The micro spatial distribution structure of the model is similar to that of real shale gas reservoir core, it overcomes the difficulty that the resolution of single scale 3D digital gas reservoir core model and the micro size characteristics of gas reservoir core cannot be perfectly considered. It can not only accurately describe the micro pore space distribution structure of real core gas reservoir, but also accurately describe the macro heterogeneity of deep shale gas reservoir core.
Countermeasures for the Development of International Economy and Trade under the Environment of E-commerce
Authors: Wu Guanghua
Published: April 2021

The development of computer science promotes the popularization of information technology and Internet. China’s e-commerce has made further development and ushered in a period of rapid development. International trade based on e-commerce ushers in new opportunities and challenges. Therefore, it is of great significance to put forward the corresponding countermeasures for the development of international economy and trade under the environment of e-commerce. Based on this, this paper analyzes the problems existing in the international economic trade under the e-commerce environment, and puts forward the development strategies.
Research on Prevention and Control Measures of Agricultural Non-point Source Pollution of Plateau Lakes in Yunnan Province
Authors: Tang Jinli , Duan Yanzhi
Published: April 2021

The situation of agricultural non-point source pollution in Yunnan Province is dire, and its main feature is that non-point source pollution leads to lake eutrophication of nitrogen and phosphorus. Because of the current situation of the nine plateau lakes in Yunnan Province and the prevention and control of agricultural non-point source pollution in the river basin, by analyzing the characteristics of regional non-point source pollution and learning from advanced experience at home and abroad, a scientific approach to the prevention and control of the agricultural non-point source of plateau lakes in Yunnan Province is initially proposed.
Exploration on Fracturing Technology of Oil Production Well in Transitional Zone
Authors: Duan Yajie
Published: April 2021

There are low permeability and poor crude oil physical property in the second-class oil layer of the eastern transitional zone, especially crude oil viscosity is high, and underground crude oil viscosity reaches 14mPa.s. After the weak-alkali ASP combination flooding was carried out, the liquid production dropped sharply in some oil production wells, during the initial effective stage of the oil production wells, by combining the analysis of fine geological research results and the dynamic and static reflection of oil production wells, fracturing transformation was implemented for oil production wells, and good oil increase and water decrease effect was achieved.
Risk Evaluation and Simulation Analysis of Occupational Diseases in Coal Mine Workers
Authors: Liu Qing , Cao Qinggui , Qiu Xiaoxuan , Yunna Wang
Published: April 2021

In order to solve the problem of inaccuracy in the evaluation of occupational disease risk due to the characteristics of unknown and uncertainty, the coal mine occupational disease evaluation system was constructed, the weighting method of “AHP+entropy method” was introduced, and the Lagrangian function and European style were used. The distance function is used to obtain the combined weights of occupational disease evaluation indicators, and the unascertained measurement theory is used to construct the occupational disease risk evaluation model. After that, the Arena software is used for simulation analysis, and the continuous space iteration method is used to obtain the priority of coal mine occupational disease influencing factors. A case study on the occupational disease risk of Zhenchengdi Coal Mine is carried out with the method proposed in this paper. The simulation results and evaluation results are consistent with engineering examples, which shows that the evaluation model based on the “AHP+entropy weight method” unascertained measurement theory is practical and accurate. It is feasible and reliable, also can provide a basis for the risk assessment and prevention of coal mine occupational diseases.
Investigation and Analysis of the Main Pollution Sources in Fuxian Lake
Authors: Cheng Haoliang , Yang Jurui , Liu Yuxin , Yuan Huihao
Published: April 2021

Fuxian Lake is a plateau-based freshwater lake. In recent ten years, with the rapid development of the economy around the lake, the water quality of Fuxian Lake has declined and the nutritional status in lake has increased obviously. To identify the main sources of pollution in Fuxian lake and provide a reference for the protection and management direction and theoretical guidance, the pollution status of Fuxian Lake basin was analyzed and evaluated from the aspects of rural domestic pollution, farmland runoff pollution, urban domestic pollution, phosphorous chemical pollution and tourism pollution, respectively, based on years of field investigation and the indexes detection and analysis such as chemical oxygen demand (COD), total nitrogen, total phosphorus. The results showed that the pollution in Fuxian Lake basin mainly came from the rural non-point source pollution, urban domestic pollution, waste phosphate rock area pollution, tourism pollution and other aspects, among which the most important source of pollution was the rural non-point source pollution, including watershed village pollution, human and animal excrement pollution, rural waste pollution, and farmland runoff pollution in the basin. The COD, total nitrogen and total phosphorus from rural non-point source pollution accounted for 94.81%, 94.85% and 87.79% of the total pollution into the lake, respectively. Among them, the farmland runoff pollution was the most important component of rural non-point source pollution
Carbon Information Disclosure in The Network Environment
Authors: Wu Die , Zhu Shuzhen
Published: April 2021

Facing global warming and environmental problems, enterprises should fulfill their environmental responsibilities in protecting the environment, reducing carbon emissions and improving environmental quality. With the development of computer network technology and the promotion of 5G technology, carbon information disclosure has become intuitive and individualized, which will, to a great extent, help enterprises disclose carbon information in a timelier manner. Based on the current situation of carbon information disclosure in the network environment, this paper studies and analyzes the problems with regard to carbon information disclosure in the network environment, so as to better satisfy the diversified demands of carbon information users in the network environment and provide assistance for decision makers.
Research on the Development Quality Evaluation of energy enterprises from the perspective of low-carbon
Authors: Xie Libin , Fang Yanyun
Published: April 2021

National strategic transformation puts forward higher requirements for energy conservation and emission reduction in energy enterprises. Under the low-carbon perspective, energy enterprises should seize the opportunity and combine their own conditions to realize energy conservation and emission reduction while ensuring the development quality of enterprises. This paper constructs a development quality evaluation system for energy enterprises, which includes four first-level indicators including customer dimension, environmental protection dimension, social responsibility dimension and financial dimension, and 18 second-level indicators, providing reliable basis for high-quality development of energy enterprises.
Inheritance and dissemination of Chinese Wushu from the perspective of cultural geography
Authors: Guo Qingkai
Published: April 2021

In the process of its formation and development, Wushu is deeply influenced by the cultural and geographical environment. At present, the inheritance and development of Wushu have been paid more and more attention. The international spread of Wushu has become a window for the world to understand Chinese culture. Therefore, it is of great significance to study Wushu culture from the perspective of geographical culture. From the perspective of cultural geography, the emergence and development of Wushu is one of the hot spots in the study of Wushu culture. Based on this perspective, this paper discusses the inheritance and dissemination of Chinese Wushu, with a view to contributing to the spread of Chinese Wushu.
Effect of Er content on the interfacial microstructure, shear properties and creep properties of Sn58Bi joints
Authors: Li Qi , Xiong Min , Liu Fengmei , Wu Huacheng , Yue Xiong , Li Likun , Gao Haitao , Yi Yaoyong
Published: April 2021

The influences of Er content on the interfacial microstructure shear properties and creep properties of Sn58Bi joints were investigated in this study. The intermetallic compound composition of Sn58Bi-xEr/Cu was Cu6Sn5 compound. The addition of Er suppressed the activity of Sn element, decreased the driving force for the growth of Cu6Sn5 intermetallic compound and decreased the thickness of Cu6Sn5 intermetallic compound layer. The shear properties and creep durability of Sn58Bi-xEr/Cu welded joints were improved to a certain extent. At the Er content of 0.1%, the shear strength and creep durability properties of the solder alloy are relatively optimal. When wt%Er was more than 0.1%, with the increasing Er content of rare earth elements, the internal organization of the joint interface is coarsened, and the flatness of the IMC layer at the interface is reduced, which leads to the decrease of the creep performance of the final joint.
The Effect of The Precision of Exercise Data on Food Selection
Authors: Luo Yuanfang , Yuan Dan
Published: April 2021

Replacing calorie information with the exercise data has been a new direction for public policies on food marketing and an alternative for food enterprises. Behavioral studies on the effect of data precision on food selection in real-life scenarios indicate that more precise exercise data will make consumers to select healthy food with lower calories. These findings shed light on the managerial application for policymakers and food enterprises.
Single Molecule Force Spectroscopy of Siloxanes
Authors: Chen Ling , Yang Liya , Wang Chunxia , Zhu Ting
Published: April 2021

Silicone elastomers are high tech materials with some disadvantages. In order to make some improvements, the measurement and analysis of force-extension curves with Single molecule force spectroscopy (SMFS) is necessary. To determine the elastic properties of the silicone elastomers, modifications on the cantilevers and on the wafer surfaces have been performed.
Study on Separation and Purification of Chemical Components of Dichloromethane from Pine Needle Extract
Authors: Liu Yinan , Liao Bing , Guo Wenjie , Fu Yujie , Sun Wan , Fu Yao , Wang Dandan , Kang Hongling
Published: April 2021

To study the chemical composition of the extract of cedar pine needle methylene chloride. Methods: The paper used silica gel and Sephadex LH-20 column chromatography to separate and purify, and carried out structural identification based on physical and chemical properties and spectral data. At the same time, gallic acid was preliminarily separated by high-performance liquid chromatography (HPLC), the separation conditions of gallic acid were determined, and the content change of gallic acid after tannin was acid-decomposed was determined, proving that the extract may contain decomposable hydrolysis Tannin or compound tannin. Results: Five compounds were isolated from the dichloromethane extract of cedar pine needles, which were identified as: ferulic acid (1), osthol (2), β-phenylacrylic acid (3), paeonol (4), Magnolol (5). Conclusion: All compounds except Compound 5 were isolated from this plant for the first time.
Research on Improvement Technology of Wet Grinding Process Based on L-Cysteine Fermentation Condition
Authors: Yan Rong , Li Xin , Liu Yinan
Published: April 2021

To study the effects of wet milling, farm Corn; starch; gel filtration chromatography; wet milling; fermentation modification; extrusion enation modification of lactic acid bacteria and extrusion technology on the composition of starch in corn flour. Common corn varieties as a material, corn flour is prepared by wet milling, fermentation modification of lactic acid bacteria and extrusion puffing technology, and starch is extracted from corn flour, using Sepharose CL-2B, Agarose gel column chromatography was used to study the composition of starch. The GPC chart of wet-milled corn flour starch has a bimodal distribution, and the starch molecules are divided into macromolecules Branched-chain region (region I) and straight-branched mixed region (region II), the elution volume of region I is 21-42 ml, and the average molecular weight polymerization degree is 26 632-18 666,The elution volume of zone II is 42-70 ml, and the relative molecular weight average polymerization degree is 18 666-8 046; the starch GPC spectrum of fermented modified corn flour is also double peak Distribution, but the average molecular degree of polymerization of the two regions narrowed, and the starch composition changed; the GPC spectrum of extruded corn flour starch showed a single peak distribution, and the relative The average polymerization degree of the molecular weight is 27 960-9 374. [Conclusion] Starch molecules are degraded during fermentation and extrusion of lactic acid bacteria, and degradation occurs during fermentation The starch molecules are mainly the starch molecules between zone I and zone II, and the high temperature and high shear in the extrusion process make most of the starch molecules in zone I occur degradation.
Study on Preparation and Luminescence Properties of Li2CaSiO4: Pr3+ Phosphor
Authors: Li Zhisen , Wen Yan , Chen Dai , Man Shiqing
Published: April 2021

In this paper, a high-temperature solid-phase method was used to synthesize Pr3+ ion-doped Li2CaSiO4 matrix phosphor. An X-ray diffractometer and a fluorescence transient spectrometer were used to characterize the crystal structure and luminescence properties of the prepared phosphors. The results show that the prepared sample is a single phase of Pr3+-doped Li2CaSiO4; it exhibits a good orange light emission under the excitation of blue light, and is expected to be used as white light LED lighting
Thermo-sensitive hydrogel and their biomedical applications
Authors: Tian Meng Li , Zhou Jin Feng , Qi Xuejie , Shen Rui
Published: April 2021

Thermo-sensitive hydrogel has attracted considerable attention as a kind of intelligent material in the field of biochemistry and biomedicine. They have many kinds of advantages such as easy formulation to deliver hydrophilic and hydrophobic drugs, high drug loading capacity, convenient administration, sustained drug release capacity, target specificity by using injections thereby avoiding the need of surgery. Besides, thermo-sensitive hydrogel has attracted an increasing concern for its sustained release behavior, biocompatibility, and biodegradability. The biomedical application of thermo-sensitive hydrogel in the fields of tissue engineering, mucosal drug delivery, and local injection in recent years were studied in this review according to the latest relevant literature.
Intelligent Research and Upgrade of Narrow-band Hot-rolled Steel Production Workshop
Authors: Hao Xiaodong , Sun Changjie , Yang Chi , Li Lihua , Ma Yong , Yin Zihao
Published: April 2021

This paper expounds the process and equipment characteristics of the narrowband hot-rolled steel intelligent production workshop, introduces the key intelligent model content, explains the application effect after the completion of the intelligent workshop transformation, and points out the research significance and development trend.
Research on High Precision Attitude Measurement of Flexible Link Based on Low Cost Sensors
Authors: Yu Feng
Published: April 2021

Flexible links are widely used in industrial robots and special robots due to their light weight, high load ratio and good maneuverability. Due to the flexibility of the connecting rod, the vibration and deformation of the manipulator will occur during the movement, which will affect the stability of the flexible arm. According to the theory of elastic deformation, the attitude of the whole flexible arm can be estimated by indirectly measuring the deformation of the flexible arm. In this paper, low-cost sensors such as encoder, strain sensor and angle sensor are used to measure the deformation of the flexible arm. Through theoretical analysis, the posture and end position of the flexible arm after deformation are obtained. The experimental system is built to verify the proposed method. The results show that the method is correct and effective. The measurement error is 6.5% in the experiment, which meets the measurement accuracy requirements of flexible arm control.
Finite element analysis of silicone rubber based on Yeoh constitutive model and Ogden constitutive model
Authors: Zhang Qi , Meng Guoying , Geng Haixu , Suo Shuangfu , Zhang Jinsen
Published: April 2021

Based on the two constitutive models of Yeoh constitutive model and Ogden constitutive model, a finite element model of uniaxial compression experiment of silicone rubber was established. The stress-strain curves and stress clouds of different models of silicone rubber were compared to further verify the two models. It is found that the Ogden model (N=3, N=5) has a good fit between the stress-strain curve simulation results and the nominal stress-strain curve when there is only uniaxial compression test, and the model constant Compare solutions.
Mechanical properties of aramid fiber reinforced rubber sealing gasket at different temperatures
Authors: Zhang Bin , Feng Xiucheng , Yang Cheng , Yu Xiaoming , Nie Jiawei
Published: April 2021

The reliability of sealing connection system mainly depends on the performance of sealing materials. The key to solve the problem of high parameter seal is to develop new sealing composite materials. In view of the seriousness of energy and environmental problems, aramid fiber reinforced composites as an alternative to asbestos composites have received more and more attention. In this paper, the effects of different temperature, tensile rate and sample orientation on mechanical properties of aramid fiber reinforced rubber sealing composites were studied. The results showed that the initial elastic modulus and the tensile strength of the material increase with the increase of tensile rate and decrease with the increase of temperature. The tensile strength of material in longitudinal direction was greater than that in transverse and 45 degree direction. Furthermore, the fracture displacement of material at 20°C was much larger than that at 100°C.
Design of laser welding workstation control system based on industrial robot
Authors: Wang Zhelu
Published: April 2021

In order to realize the automation of laser welding industry, a control system of laser welding workstation based on PLC and industrial robot is designed. The control system takes ABB industrial robot and S7-300 PLC as the control core, adopts PROFIBUS bus communication, carries out the hardware selection, construction and program design of workstation control system. Production practice shows that the system workstation can automatically complete laser welding and other production tasks, the overall operation is good, the working speed is stable, the working speed is fast, and it has broad application prospects.
Investigation on creep law of QT600 ductile iron based on cellular automata
Authors: Wu Hongliang
Published: April 2021

The steady state creep rates of QT600 ductile iron under various temperature are obtained by high temperature creep experiments. And the cellular automata model of creep microstructure evolution of QT600 ductile iron was established based on quantitative analysis of the microstructure. The results of the model are in good agreement with the results of the validation experiments. It’s shown that the cellular automata model is feasible and with high precision to predict the creep law of QT600 ductile iron. The results can provide some technical references for the safety analysis of QT600 ductile iron.
Study on the Performance of Pd-Catalyst Based on Decolorization Rate
Authors: Zhang Yongli
Published: April 2021

The simulated azo dye waste-water was treated by Catalytic Wet Oxidation. The catalyst was prepared by impregnation method, and FSC (main component: γ-Al2O3) was used as the catalyst carrier, and 6wt%Cu, Fe, Pd and La were added. The catalyst was dynamically impregnated at 35 °C for 8 h, dried at 110 °C for 10 h, and roasted at 450 °C for 3h to prepare the supported catalyst. Based on the decolorization rate of treated waste-water, the effect of component composition on catalyst performance was investigated. In the CWAO treatment of waste-water, the pH of the treated effluent first decreased and then increased with the extension of reaction time; with the extension of reaction time, organic matter degrades continuously, the absorbance of waste-water decreases and the decolorization rate increases. Cu-Fe-Pd-La/FSC (ratio 0.75:0.75:1.5:3) has the best treatment effect; the metal dissolution concentration of the waste-water increases with the reaction time. Cu and Al are relatively stable, and the dissolution concentration in treated effluent is between 0.5 and 3.0 mg/L. The results showed that the Cu-Fe-Pd-La/FSC catalyst composed of Cu: Fe: Pd: La=1:1:1:3 had good catalytic activity and stability.
Study on the Electrical Performance of 10kV Composite Material Crossarm
Authors: Wen Jiqun , Wu Xiong , Ke Rui , Shen Fan , Mei Duan , Guo Wei
Published: April 2021

The composite material crossarm has excellent insulation, water repellency, light weight and high strength, which can effectively improve the safety level of the power line. Research results showed that the dry flash lightning voltage and wet flash frequency voltage of the composite crossarms were increased by 50% and 39% respectively, compared to the angle steel crossarms fixed with the same size insulator and the same air gap; corresponding wet frequency withstand voltage and filthy resistance voltage were increased by 117% and 30%, respectively; and the wet and filthy flashover all occurred on the surface of the composite material crossarms.
Experimental Design of Acoustic Emission Detection for Micro Leakage in Marine Compressed Gas System
Authors: Wu Mengmeng , Yang Jiaxuan , Jiang Bin
Published: April 2021

In order to detect the micro leakage of marine compressed gas pipeline system, an experimental platform for detecting the micro leakage of compressed gas is designed by using acoustic emission technology. The results show that the experimental platform can effectively simulate the two typical marine compressed gas pipeline leakage problems: pipe wall damage and valve internal leakage. At the same time, these leakage problems can be effectively detected by using acoustic emission signal acquisition and processing system.
Research on Intelligent Monitoring Technology of Substation and Distribution Station Driven by Big Data
Authors: Wu Junxing , Hu Yang , Huang Chizhi
Published: April 2021

The power transformation and distribution station is the power supply foundation to ensure the normal operation of all kinds of large factories and large communities. The realization of the overall solution of intelligent monitoring system for transformer and distribution station based on big data helps to ensure the safe operation of power transformation and distribution station and ensure the quality and stability of regional power supply. The intelligent monitoring system of power transformation and distribution station based on big data is composed of automatic monitoring system of power transformation and distribution and intelligent monitoring system of Internet of things of power transformation and distribution station. Through the research and application of partial discharge monitoring, SF6 leakage detection, wireless sensor and other technologies, big data analysis technology is used to analyze the monitoring data, so as to realize remote monitoring and intelligent monitoring and diagnosis of power transformation and distribution station.
Research on the Dispatching Strategy of Desalination Load Participation in Distributed Renewable Energy Consumption
Authors: Song Jie , Zhu Qing , Chen Jiadong , Chen Liangliang , Chen Peiyu
Published: April 2021

In this paper, the dispatching problem of desalination load participation in distributed renewable energy consumption is taken as the research object, and the various characteristics of desalination system operation are analysed. According to the operating characteristics of the system, the operation constraints and optimal dispatching objectives of the multi-energy system with desalination load are proposed. An optimal dispatching model for distributed renewable energy consumption with desalination load participation was established and the linear simplex algorithm was used to solve the dispatching model according to the characteristics of the optimization model. The example shows that by optimizing the operation of the multi-energy system with seawater desalination load, it will help the local high-density distributed power supply to be consumed locally and improve certain economic benefits.
A Review on MXene: Synthesis, Properties and Applications on Alkali Metal Ion Batteries
Authors: Wang Zifan
Published: April 2021

As a new type of two-dimensional material, MXene has been extensively known due to its various functional groups. The profuse surface terminated functional groups bring good conductivity and hydrophilicity to MXene, make it a good material for batteries. In this article, the synthesis, properties and batteries applications of MXenes were introduced, and the current challenges and outlook for future research on MXene applications was discussed.
Research on Power Equipment System of Knowledge Graph under Electric Energy in Smart Grid
Authors: Hu Jiangyi , Zhang Nan , Shang Yingnan , Yu Jun , Zhang Wenqiang
Published: April 2021

In order to realize technological innovation in the electric power field, the article uses artificial intelligence, big data analysis and mining, knowledge graphs, natural language processing and other technologies to construct Chinese professional dictionaries and knowledge graphs in the electric power field. And on this basis, the thesis puts forward the technical architecture of a comprehensive energy service support system based on the concept of “a picture of the power grid”, a spatiotemporal data management platform and a graph database query application implementation mechanism. Finally, research and design the visualization of the hierarchical organization of the data, use the association relationship between the data to organize the data into multi-topic classification and hierarchical organization, and provide a friendly interactive man-machine interface.
Research on Location and Layout of Electric Vehicle Charging Facilities Based on Power System Dispatch
Authors: Guo Jinji
Published: April 2021

In order to enable the limited charging stations in the road network to meet as many demands as possible, and to give full play to the advantages of electric vehicles in changing the energy consumption structure and reducing greenhouse gases, a dualobjective charging station optimization problem is proposed. The paper uses the shortest path and the next-shortest path to describe the traffic flow factors in the traffic network. The goal is to maximize the traffic flow intercepted by the charging station, minimize the investment cost of the charging station and minimize the node voltage offset, and establish electric vehicle charging Station multi-objective planning model. The results prove the effectiveness of the proposed method and provide decision support for enterprises to scientifically and reasonably select the location of charging stations.
Analysis of the detection method of insulators deterioration based on optical electric field sensors
Authors: Yaowen Liu
Published: April 2021

With the acceleration of uh-voltage transmission project construction, transmission lines are becoming increasingly important to maintain the safe and stable operation of the power grid, and insulators are essential components of mechanical support and electrical connection in transmission lines. However, due to long-term environmental impact, insulators exposed deteriorate year by year. Therefore, it is necessary to detect the faulty insulator in advance, and to carry out the test in the operating state of the insulator string to identify and replace the faulty insulator string in time. However, the current method of detecting insulators in actual engineering is greatly affected by the environment, the test result is not accurate enough, the predictability is not good and the detection efficiency is low. The optical electric field sensor based on the Pockels effect of optical crystals can realize chargerd detection, improve detection accuracy, reduce environmental impact, and make the detection more stable, lower cost, better economy compared with methods widely used in the market, such as infrared detection method, ultraviolet detection method, sonic detection method, manual methods. Further consideration can be given to combining with drones to expand usage scenarios and improve detection performance for widespread use.
System of monitoring and early warning for temperature of truck Brake shoe
Authors: Yao Xueping , Ji Bingkui , Zhong Yuexi , Li Mingda
Published: April 2021

For truck brake shoe early-warning temperature dynamic detection, this paper proposes a temperature detection device for brake shoe based on thermocouple temperature sensor, and by using ANSYS finite element analysis method to analyse the brake drum brakes, brake shoe linings in the process of the location of the maximum temperature, and determined the brake temperature of the brake safety threshold. To liberate the acetate II heavy commercial vehicles for the test vehicle, MC9S12XEP100 microcontroller as the car terminal, designed and developed brake shoe temperature dynamic detection warning system platform, and researched. The experimental results show that the temperature measurement error is less than or equal to 4%, which verifies the accuracy and feasibility of this method for dynamic detection of the temperature of the warning hoof.