bluuebunny/crossref_metadata_2025 huggingface dataset:
Capacitive making of double‐break vacuum circuit breaker: Transverse magnetic field contacts are superior to axial magnetic field contacts
Authors: Geng Yun , Chen Xinggui , Zhang Luyang , Yao Xiaofei , Peng Jing , Geng Yingsan , Liu Zhiyuan
Published: January 2022

Previous studies mainly focused on the behaviours of single‐break vacuum circuit breakers (VCBs) in switching capacitor banks. The prestrike characteristics of double‐break VCBs subjected to axial magnetic fields (AMFs) and transverse magnetic fields (TMFs) in capacitive making operations, to find a proper structure of double‐break VCBs for capacitive switching are experimentally investigated here. Special attention is given to the prestrike gap, inrush current interruption, prestrike voltage, prestrike electric field strength and erosion on contact surfaces of double‐break VCBs. The results show that the 50% prestrike gap d50 and the scatter in prestrike gaps are significantly reduced by nearly 50% by the TMF double‐break VCB compared with the AMF double‐break VCB. The 50% prestrike arcing time ta50 of the TMF double‐break VCB can be reduced by 37.0% compared with the AMF double‐break VCB. The voltage distribution ratio between two vacuum interrupters (VIs) is more balanced in the TMF double‐break VCB (6:4) than in the AMF double‐break VCB (7:3) when prestrike occurs. The TMF double‐break VCB can reduce the erosion caused by inrush currents on contact surfaces compared with the AMF double‐break VCB. In switching capacitor banks, the TMF double‐break VCB is superior to the AMF double‐break VCB.
Statistical strong lensing
Authors: Sonnenfeld Alessandro
Published: January 2022

Context. Strong lensing mass measurements require the knowledge of the redshift of both the lens and the source galaxy. Traditionally, spectroscopic redshifts are used for this purpose. Upcoming surveys, however, will lead to the discovery of ∼105 strong lenses, and it will be very difficult to obtain spectroscopic redshifts for most of them. Photometric redshift measurements will also be very challenging due to the blending between lens and source light.

Aims. The goal of this work is to demonstrate how to carry out an inference of the structural properties of the galaxy population from the analysis of a set of strong lenses with no individual source redshift measurements, and to assess the loss in precision compared to the case in which spectroscopic redshifts are available.

Methods. Building on the formalism introduced in Paper III, I developed a method that allows a statistical strong lensing inference to be carried out while marginalising over the source redshifts. This method, which relies on the knowledge of the properties of the unlensed background source population and of the selection function of the survey, generalises an approach known as photogeometric redshift, originally introduced by the Strong Lensing Legacy Survey collaboration. I tested the method on simulated data consisting of a subset of 137 strong lenses that is complete above a cut in observational space.

Results. The method recovers the properties of the galaxy population with a precision that is comparable to that attainable in the case in which individual source redshifts are known.

Conclusions. The photogeometric redshift method is a viable approach for the analysis of large sets of strong lenses provided that the background source population properties and lens selection function are well known.
A revised method to calculate time-varying mesh stiffness of helical gear
Authors: Wu Xiao , Luo Yang , Li Qinmin , Shi Juanjuan
Published: January 2022

Time-varying mesh stiffness (TVMS) of gear plays vital role in analysing dynamic characteristic of gear transmission. So accurately evaluating the TVMS is important and essential. In this paper, a revised method to calculate the TVMS of helical gear is proposed. Based on slice method, the helical gear is sliced into pieces along the tooth width direction. The proposed method corrects the fillet foundation stiffness within multi-tooth in contact and considers the non-linearity and load-dependence of the Hertzian contact stiffness. The effect of the axial mesh force is considered. Finally, an equivalent helical gear model is established in ANSYS to study the mesh stiffness. The results show the proposed method has high effectiveness compared with FEM (finite element method).
Analytic model research of sound propagation in pipe wall with sound absorption
Authors: Ren Juan , Liu Qingjun , Chen Ting , Deng Pingye
Published: January 2022

There are a lot of principles for sound transmission in the pipeline for whether sound transmission structure or noise reduction structure. Even in ultrasonic testing, there is a large number of principles for using pipeline sound transmission. Based on the sound propagation model and the boundary conditions of pipe wall sound absorption, the sound propagation equation for pipe wall sound absorption is given by establishing mathematical model and solving mathematical equation in this paper. When the distribution of sound field along the cross-section of the pipe (outlet) is ignored, the transmission efficiency of sound with different frequencies can be calculated or the sound absorption efficiency can be calculated. The analytical solution of the sound transmission equation in the pipeline has great theoretical significance and practical value for guiding the structural design of sound transmission and noise reduction, improving the calculation efficiency and verifying the numerical analysis results.
Numerical simulation of S-shaped inlet under the intake total pressure distortion
Authors: Liu Ying , Zhang Xiaobo , Yu Yang , Yan Bingkun , Cai Congrui , Wu Bateng
Published: January 2022

During the development of the stealth fighter, the S-shaped inlet enters the designer’s vision because it has better stealth than bump inlet and straight inlet. During the use of the S-shaped inlet, due to its structural reasons, secondary flow is likely to occur in the curved section, which directly causes the flow state to be changeable and complicated. Therefore, this paper takes the S-shaped inlet as the research object to analyzes the steady flow field simulation under uniform inlet condition and distortion inlet condition and analyze the flow field of the airflow and the total pressure of each section under the S-shaped inlet by changing the intake distortion conditions with CFX software. The results show that although the S-shaped inlet will occur total pressure distortion under uniform intake. However, when the S-shaped inlet work under certain flight conditions, the level of total pressure distortion will be smaller than the uniform inlet condition, which can improve the air intake performance. Finally, it can be inferred that with use of the S-shaped intake port, the deterioration of distortion may be prevented under certain specific intake conditions.
HCF behavior of material Tc17 considering surface roughness Ra
Authors: Gao Sibo , Yang Wei , Wang Jinlong , Yu Yang , Ding Qi , Gao Xiaohan , Tian Tian
Published: January 2022

Surface scratch has significant influence on the fatigue behavior of Ti-5Al-2Zr-4Mo-4Cr. In this paper, fatigue test with three different surface roughness are conducted, test results are recorded, including test data and fracture characteristics. The distribution of test data is analyzed and the fracture characteristics are discussed according to the change of surface roughness. Study of fatigue behavior of Ti-5Al-2Zr-4Mo-4Cr with surface roughness is significant intheoretical and engineering fatigue study.
Crystal structure and Hirshfeld surfaces analysis of Heterocyclic-and circulenes
Authors: Karaush-Karmazin Nataliya , Baryshnikov Glib , Minaev Boris
Published: January 2022

The crystal structure of the new diazatrioxa[9]circulene and tetrahydro-diazatetraoxa[10]circulene which represent the first synthesized representatives of “higher” hetero[n]circulenes with n>8, was analyzed in details. Hirshfeld surface analyses, the dnorm surfaces and two-dimensional fingerprint plots were used to verify the contributions of the different intermolecular interactions within the crystal structure of diazatrioxa[9]circulene and tetrahydro-diazatetraoxa[10]circulene. The Hirshfeld surface analysis of the crystal structure clarifies that the most important contribution for crystal packing is from H∙∙∙H and C∙∙∙H intermolecular interactions for both circulenes. The shape-index surface shows that in the case of diazatrioxa[9]circulene two sides of the molecules are involved with the same contacts in neighbouring molecules and curvedness plots show flat surface patches that are characteristic of planar stacking. Such face-to-face structural organization provides the main charge transfer pathway in [9]circulene. In the case of [10]circulene, the area involved in the same contacts is much less, however, two types of intermolecular packing modes can form such flat surface patches at curvedness plots which is useful for more efficient charge transfer.
Study on mesoporous catalysts for oxidation of volatile organic compounds
Authors: Ran Xianqiang
Published: January 2022

Volatile organic compounds (VOCs) emitted from many industrial processes, are harmful to human health and the atmsphere. Several technologies are currently used to eliminate VOCs from the environment. Among them, catalytic oxidation has been recognized as one of the most efficient and promising ways to treatment VOCs. So high performance oxidants play an dominant role in the catalytic oxidation process. In this work, we discussed many researchers’ works about preparation and effect of their catalysts, kinds of mesoporous catalysts for eliminating VOCs were reviewed, the active components of the catalysts are noble and non-noble metal oxides, which loaded in the mesochannels of mesoporous materials including silica, titania and aluminia.
Effect of leaf damage on chlorophyll fluorescence parameters of Eupatorium adenophorum and its genera
Authors: Chen Yingzhi , Zhang Xingcheng , Luo Zijun , Pan Gengyun , Wang Ruifang
Published: January 2022

Eupatorium adenophorum has a serious impact on agriculture and biodiversity in China. Chlorophyll fluorescence parameters of E. adenophorum and its genera were investigated after leaf damage treatments. The results showed that the changes of chlorophyll fluorescence parameters were greatly affected by the treatment methods and species. The changes of chlorophyll fluorescence parameters of E. adenophorum and E. lindleyanum after insect feeding were significantly greater than those after simulated insect feeding. Compared with E. lindleyanum, E. adenophorum had lower LEF, higher Phi2 and PhiNPQ after damage. Therefore, E. adenophorum had a higher defense ability against insect food damage compared with E. lindleyanum.
Several generalizations on Wolstenholme Theorem
Authors: Zhu Yuyang , Huang Jing , Wang Lili , Li Ming
Published: January 2022

This paper generalizes Wolstenholme theorem on two aspects. The first generalization is a parameterized form: let p > k + 2, k ≥ 1, ∀t ∈ ℤ, then

${{(pt + p - 1)!} \over {(pt)!}}\mathop \sum \limits_{m = 0}^{k - 1} {( - 1)^m}\mathop \sum \limits_{1 \le {i_l} < \cdots < {i_{k - m}} \le p - 1} {{{p^{k - (m + 1)}}} \over {\mathop \prod \limits_{l = 1}^{k - m} (pt + {i_l})}} \equiv 0{\left( {\bmod {p^{k + 1}}} \right)^.}$

The second generalization is on composite number module:

Let 1overa be the x in congruent equation ax ≡ 1(mod m)(1 ≤ x < m),

if m ≥ 5, then

$$\matrix{
{\sum\limits_{\scriptstyle (k,m) = 1, \hfill \atop
\scriptstyle 1 \le j \le m \hfill} {{{\left( {{1 \over k}} \right)}^2}} } \hfill & \equiv \hfill & {{m \over 6}[2m\varphi (m) + \prod\limits_{p|m} {(1 - p)]{{(\bmod m)}^{\;;}}} } \hfill \cr
{\sum\limits_{\scriptstyle (k,m) = 1, \hfill \atop
\scriptstyle 1 \le j \le m \hfill} {{{\left( {{1 \over k}} \right)}^3}} } \hfill & \equiv \hfill & {{{{m^2}} \over 4}[m\varphi (m) + \prod\limits_{p|m} {(1 - p)](\bmod m){\;^;}} } \hfill \cr
{\sum\limits_{\scriptstyle (k,m) = 1, \hfill \atop
\scriptstyle 1 \le j \le m \hfill} {{{\left( {{1 \over k}} \right)}^4}} } \hfill & \equiv \hfill & {{m \over {30}}[6{m^3}\varphi (m) + 10{m^2}\prod\limits_{p|m} {(1 - p) - \prod\limits_{p|m} {(1 - {p^3})](\bmod m){\;^;}} } } \hfill \cr
{\sum\limits_{\scriptstyle (k,m) = 1, \hfill \atop
\scriptstyle 1 \le j \le m \hfill} {{{\left( {{1 \over k}} \right)}^r}} } \hfill & \equiv \hfill & {{m^r}\sum\limits_{d|m} {\mu (d){{\left( {{m \over d}} \right)}^{ - r}}\sum\limits_{k = 1}^{{m \over d}} {{k^r}(\bmod m){\;^.}} } } \hfill \cr } $$

Where φ(x) is Euler function , μ(x) is Möbius function.
Numerical simulation analysis of rotary cup centrifugal blast furnace slag
Authors: Yang Mengyuan , Wang Jingfu
Published: January 2022

In the process of centrifugal dry granulation of blast furnace slag, the thickness of the liquid film at the outlet of the rotor will have a significant impact on the degree of crushing of the slag after leaving the rotor and the size of the solid particles formed. Therefore, this paper uses the VOF method to analyse the flow of molten slag inside the cup. The results have shown that the slag flow has a significant effect on the thickness of the liquid film and the linear relationship is obvious; the thickness of the liquid film decreases with the increase of the diameter of the rotary cup and the rotation speed, and the negative correlation with the diameter of the cup is more obvious; Secondly, as the depth of the cup increases, the thickness of the liquid film decreases first and then increases. The inclination angle of the cup wall has little effect on the thickness of the liquid film.
Modeling and analysis of responsive space launch system based on timed colored Petri NeT
Authors: Zhang Qian , Li Xinhong
Published: January 2022

Responsive space launch is currently developing rapidly and has application cases in many fields, with advantages such as fast response speed and flexible networking. Aiming at the efficiency evaluation of responsive space launch system, this article first summarizes the typical process of fast space launch, and then gives a hierarchical model of a space fast launch system based on timed colored Petri nets, including top-level model, demand model, command decision model, launch Model, measurement and control model, and finally use CPN Tools to simulate and verify the model, analyze the basic characteristics of the model and the performance of the system, and provide data support and theoretical basis for the optimization of the fast space launch system.
Simulation analysis of environmental pollution based on parallel data model
Authors: Lv Jiangyi , Jiang Cherry , Qu Yezun , Wang Nan
Published: January 2022

Through model verification and algorithm correction, many factors unfavorable to environmental protection existing in the production of export products abroad are analyzed. The growth trend of export trade volume of industrial industries and regions with a high degree of openness is generally consistent with the emission trend of environmental pollutants. Environmental pollution restricts China's economic growth and brings certain negative effects on China's economic growth, The relevant data analysis suggestions for improving the impact of export product production on environmental pollution are put forward.
Study on real-time prediction model of railway passenger flow based on big data technology
Authors: Yin Yiyi , Zhang Yong , Wei Zhengzheng , Zhao Xiang
Published: January 2022

In order to solve the limitation of traditional offline forecasting application scenarios, the author uses a variety of big data open source frameworks and tools to combine with railway real-time data, and proposes a real-time prediction model of railway passenger flow. The model architecture is divided into four levels from bottom to top: data source layer, data transmission layer, prediction calculation layer and application layer. The main components of the model are data flow and prediction flow. Through message queue and ETL, the data process part realizes the synchronization of offline data and real-time data; through the big data technology frameworks such as Spark, Redis and Hive and the GBDT (Gradient Boosting Tree) algorithm, the prediction process partially realizes the real-time passenger flow of the train OD section prediction. The experimental results show that the model proposed by the author has certain practicability and accuracy both in performance and prediction accuracy.
Research on the cost effectiveness of carbon emission reduction in the full life cycle of electric vehicles based on grey prediction
Authors: Zang Lizhuo , Xiao Baihui , Ma Jiayi , Liu Yufan , Tian Peiyu , Zhang Lingdi
Published: January 2022

In order to research the carbon emission reduction potential of electric vehicles, a cost effectiveness model is used to calculate and compare the economic costs and carbon emissions of fuel vehicles and electric vehicles throughout the life cycle, and an improved grey prediction model is utilized to analyze the future trends of electric vehicle emission reduction benefits. The results show that electric vehicles play a positive role in carbon emission reduction, and the unit cost of carbon emission reduction is decreasing by years. Therefore, China should vigorously develop the electric vehicle industry and technology, and achieve the strategic goal of carbon emission reduction by promoting the electrification of vehicles.
Research on copyright appointment registration microplatform system based on vue
Authors: Gu Mengdie , Sun Rui , Yang Shulin , Gu Huijie , Yuan Ming
Published: January 2022

With the rapid development of copyright industry, people’s copyright awareness of their own creation of software and works is constantly improving, the number of applications for software copyright registration and works copyright is increasing. Therefore, how to make copyright registration business becomes more convenient and efficient is imminent. Existing copyright registration system need to first fill through PC and then make an appointment through the phone to deal with relevant business. This model is not only complicated operations, but also poor user experience. Therefore, based on the analysis of multiple needs of users and enterprises, this paper proposes to use Vue,SpringBoot, MyBatis and other technologies to develop a copyright appointment registration system based on microplatform. The development of this system can not only for the user to create a more convenient way of operation, give users a better experience, but also can change, rich business approach, bring more profits.
Research on MVB conformance test system
Authors: Cui Jinxue , Han Bin
Published: January 2022

The design and implementation of the MVB conformance test system is of great significance in both professional theory and practical application. Conformance test for MVB, mainly to determine whether the MVB equipment IUT is consistent with the MVB protocol standard requirements in the TCN standard. The conformance test of MVB equipment IUT covers most of the contents of the RTP real-time protocol such as the physical layer, link layer, network layer, transport layer and application layer. This subject will analyse and study the consistency test of the MVB physical layer.
Impact of control technology on fight against COVID-19
Authors: Feng Zihuan , liang Xun , Zhao Chengzhen , Wu Jiachen
Published: January 2022

Since the outbreak of COVID-19, all countries have taken certain measures to restrain the spread of COVID-19. It is a complex and practical issue to study the measures and effects of the epidemic prevention and control. The spread of the epidemic in different countries has certain characteristics, and the prevention and control models and effects in different countries are also different. In this paper, the key factors affecting the prevention effect of COVID-19 were analyzed by integrating multiple data and using interdisciplinary methods of mathematics, statistics and information management science on the basis of public management, and the system model of influencing factors of COVID-19 was constructed.
Research on micro governance path of high-level professional group construction
Authors: Chen Guangjiu
Published: January 2022

Under the background of “double high plan”, higher vocational colleges combine the industrial background, strengthen the connection between industrial chain and professional chain. Therefore, colleges and universities delegate power to secondary colleges. Secondary colleges independently improve the grass-roots governance mechanism according to the logic of professional groups, which will help to optimize the power allocation mode, and strengthen the construction of professional organizations. The functions of professional resource allocation, power distribution and operation mechanism, so as to provide management guarantee for the construction of high-level professional groups.
A package auto-counting model based on tailored YOLO and DeepSort techniques
Authors: Xie Sijun , Zhou Yipeng , Zhong Iker , Yan Wenjing , Zhang Qingchuan
Published: January 2022

In the industrial area, the deployment of deep learning models in object detection and tracking are normally too large, also, it requires appropriate trade-offs between speed and accuracy. In this paper, we present a compressed object identification model called Tailored-YOLO (T-YOLO), and builds a lighter deep neural network construction based on the T-YOLO and DeepSort. The model greatly reduces the number of parameters by tailoring the two layers of Conv and BottleneckCSP. We verify the construction by realizing the package counting during the input-output warehouse process. The theoretical analysis and experimental results show that the mean average precision (mAP) is 99.50%, the recognition accuracy of the model is 95.88%, the counting accuracy is 99.80%, and the recall is 99.15%. Compared with the YOLOv5 combined DeepSort model, the proposed optimization method ensures the accuracy of packages recognition and counting and reduces the model parameters by 11MB.
The application of modified thermodynamic system correction method to secondary reheat steam turbine
Authors: Pan Tongyang , Zhang Jifan , Kang Jiannan , Li Mingcheng
Published: January 2022

In order to calculation the enthalpy of wet steam in the secondary reheat turbine thermal system the thermodynamic system of the secondary reheat steam turbine based on the isentropic ideal expansion process line was corrected, This method simplifies the correction calculation step and increases the accuracy of the correction result. Analysis of the rationality of the improved method shows that: Compared with the existing secondary reheat steam turbine thermal system correction method, the maximum error of the improved thermal system correction method is 0.14%. Therefore, this method can better meet the test accuracy requirements.
Design of an electromagnetic induction steam generator device based on air source heat pump
Authors: Li Zhimo , Li Jiachun , Dong Xiangli , Chen Bo , Li Qing
Published: January 2022

Aiming at the current problems of coal-fired boilers and electromagnetic induction steam generators for environmental pollution and high energy consumption, this article combines air source heat pumps and electromagnetic induction heating technology, and at the same time carries out the structure of the condensate tank and electromagnetic induction steam generator. Redesign. Through trial production and experimentation of the prototype, the results show that compared with traditional coal-fired boilers and separate electromagnetic induction heating technology to generate steam, this device not only achieves energy saving and environmental protection, but also the stability of the steam outlet temperature and the amount of steam generated. Compared with the use of electromagnetic induction heating alone, it has increased by 20%. It can be seen that the use of air source heat pump’ electromagnetic induction heating technology to generate steam saves energy and increases the amount of steam generated.
The influence of water source protection zone delimitation on development in Huanren Manchu Autonomous County
Authors: Zhang Daqing
Published: January 2022

Under the background of rapid urbanization and industrialization development, in order to satisfy the increasing demand of residents for domestic water, the establishment of water source protection zone is the most effective way to protect water resources at present. However, the influence on the social and economic development could not be ignored. The article analyzes the influence of the delimitation of water source protection zone on economy such as ecological migration, urban municipal pipe network construction, rural drinking water and urban water supply. The impact on economy like industrial enterprises, agricultural planting, livestock industry, aquaculture, tourist industry were also mentioned. The article triggers the exploration of the way to realize the coordination and sustainable development of economy, society, resources and environment
Study on the treatment of phenol-containing wastewater by doping coal char
Authors: Wang Shuqin , Zhang Zhiqiang , Zhang Jinghong , Zhang Xiao
Published: January 2022

The single blending of biomass and S-TiO2 and the mixed modification of coal char were obtained by the method of coking with coal pyrolysis furnace. The adsorption performance of biomass and S-TiO2 was investigated by the adsorption experiment of phenol solution. The results show that under the optimal conditions the best performance of MCC-2 can achieve 94% removal efficiency of phenol. The adsorption efficiency is 20% higher than that reported in the literature, and the adsorption equilibrium time is several times shorter than that reported in the literature. The modified coal char has broad prospects as a substitute for activated carbon in practical application.
Cooperative estimation algorithms for multi-sensor networks with imprecise measurements
Authors: Chen Jianxin , Ren Xinzhuo , Xu Yinfei , Meng Haojie , Zhao Zhenfan , Tang Jijun
Published: January 2022

A cooperative estimation algorithm is proposed for mutli-sensor networks with imprecise measurements caused by electromagnetic interferences, abnormal currents and other faults in the multi-sensor measurement process. Adaptive schemes based on a reference model are introduced to overcome the adverse effects of multiplicative interference on the estimated information. Then, rigorous theoretical proofs are developed to analyze the adaptive estimation algorithm. Finally, numerical simulation results are carried out to verify the effectiveness of the theoretical analysis.
Algorithm of axial compressor stall warning based on BP neural network and fuzzy logic
Authors: Qiu Xiaohong , Chen Jiali
Published: January 2022

Stall warning of axial compressor is very challenging and the existing warning margin is not enough. A algorithm based on BP neural network fusion fuzzy logic is proposed. Firstly, BP neural network is used for training recognition, next the identification results are fused with fuzzy logic reasoning to form the result judgment of time sequence, finally the stall early warning of axial compressor is realized. The simulation results of the experimental data show that the stall data at all speeds are at least 0.1s in advance of the early warning. Compared with other methods, this method has a better surge early warning margin performance and engineering practicability.
Conflict resolution and missing completion in the fusion of domain ontology in cyber-physical systems
Authors: Yan Xiangfei , Zheng Liwei
Published: January 2022

CPS integrates information services, human resource services, and physical equipment services, and always be supported by the ontologies in multiple domains. Due to the inconsistency of ontologies from different domains, the fusion of domain ontologies may have conflicts and deficiencies. Therefore, this paper provides a method for the conflict resolution and missing completion in the fusion of domain.
Sharpness evaluation of microscopic detection image for micro parts
Authors: Zhang Xianghui , Yu Zhanjiang , Xu Jinkai , Yu Huadong
Published: January 2022

According to the characteristics of micro parts microscopic detection image, including the image texture is similar, the edge information is too little and the gray distribution Range is limited, based on the basic principles of algorithm, analyzes the traditional sharpness evaluation function. Aiming at the defect that the traditional sharpness evaluation function cannot have both high sensitivity and noise immunity, an algorithm based on local variance information entropy is proposed. The method uses the local variance to weight the self-information of each gray level, on the one hand, it makes up for the lack of spatial information of information entropy and avoids misjudgement of sharpness; on the other hand, it can increase the weights of clear region pixels when they participate in the calculation of information, while reducing the weights of background and noise region pixels, thereby improve the function sensitivity. The experimental results show that compared with the traditional sharpness evaluation function, the local variance information entropy function not only has high sensitivity, but also has better noise immunity and is suitable for actual auto-focusing systems.
Pedestrian motion centroid model based on robot dynamics
Authors: Zhao Rongyong , Wang Yan , Han Chuanfeng , Jia Ping , Li Cuiling , Zhu Wenjie
Published: January 2022

In recent years, with the rapid development of computer vision technology, image-based human body research has become an important task, such as pedestrian target detection, trajectory tracking, posture estimation and behaviour recognition. The centre of mass is one of the important characteristics that can reflect the phenomenon of pedestrian movement. This paper first introduces the biped robot model in robotics, starting from forward and inverse kinematics, to find the mapping relationship between the position of each joint and the pose of the end effector. Then, corresponding to the skeleton model of the human joint points, the characteristics of the bone posture and joint angle are determined. The moment of inertia factor is introduced, and the motion superposition of different joint points is considered to establish a pedestrian motion centroid model. By calculating the equivalent dynamic centroid, the pedestrian kinematics law can be explored and the pedestrian movement mechanism can be more deeply recognized.
Spatial analysis and model construction of NDVI Based on meteorological data
Authors: Wu Jifeng , Cheng Yayu
Published: January 2022

NDVI (Normalized Vegetation Index) is an important characteristic index to study regional vegetation change, which is greatly influenced by meteorological data. Based on the analysis of the trend change and correlation between NDVI and PWV (Precipitable Water Vapor), precipitation and temperature in four geographical regions of China, this paper constructs a model between NDVI and PWV, precipitation and temperature in each geographical region according to multiple regression, and predicts NDVI through meteorological data. The results show that:(1) NDVI and meteorological factors have the same changing trend, and the maximum value appears in every region from June to September, and the value of NDVI in southern region is relatively large. (2) The correlation between rainfall and NDVI is the highest in Qinghai-Tibet region, the correlation between temperature, PWV and NDVI is the highest in northern region, the correlation between NDVI and rainfall, temperature and PWV is the lowest in southern region. (3)According to the meteorological data ,NDVI prediction can be achieved better, and the prediction effect in southern region is the best and the model accuracy is the highest. (4) NDVI is negatively related to El Niño event, positively related to La Nina event, and the stronger El Niño and La Nina events are, the higher the correlation is.
Design of operational application system of cruise missile supported by meteorological and marine information
Authors: Hou Jian , Yu Xiaqiong , Wang Jiajia , Liu Deng
Published: January 2022

In information war, the concept of “digital battlefield” is put forward, and battlefield meteorological and marine information has become an important part of digital battlefield. Based on the in-depth analysis of the impact of meteorological marine information on cruise missile, this paper puts forward the multi-dimensional demand analysis method of meteorological marine information supporting cruise missile combat application and the architecture design method based on MBSE, and gives the conceptual design framework of combat application system to provide information support for cruise missile combat application.
Yang Liuzhuang express drone application and development study
Authors: Wang Linguang , Yao Jinghui
Published: January 2022

This paper presents a feasibility study on the application of delivery drones in Yang Liu Zhuang. In order to make the cost calculation convincing, the article realistically simulates the delivery scenario of Yang Liu Zhuang during the epidemic, and then analyzes its transportation cost in depth, and finally concludes that using drones to partially replace traditional delivery in Yang Liu Zhuang can save costs and improve logistics efficiency. However, at present, the delivery by express drones is mainly limited by their own load weight, and they cannot deliver medium and large goods.
InP and InGaAs grown on InP substrate by molecular beam epitaxy
Authors: Yu Hailong , Gao Hanchao , Wang Wei , Ma Ben , Yin Zhijun , Li Zhonghui
Published: January 2022

InP and InGaAs epitaxial layers on InP substrates using molecular beam epitaxy (MBE) have been studied. Carrier concentration and mobility of InP and InGaAs are found that are strongly correlated with the growth temperature and V/III ratio. The InGaAs layers using As2were compared with the layers grown using As4from a Riber standard cracker cell. When As4is used, the highest electron mobility of InGaAs is 3960 cm2/(V·s) with the V/III ratio of 65. When converted to As2, the V/III ratio with the highest electron mobility decreased to 20. With the arsenic cracker temperature decreased from 950 ℃ to 830 ℃, the electron mobility increased from 4090 cm2/(V • s) to 5060 cm2/(V • s).
Hopf bifurcation analysis in a stage-structure predator–prey model with two time delay
Authors: Han Bochen , Yang Shengming , Zeng Guangping
Published: January 2022

In this paper, we consider a predator-prey system with two time delays, which describes a prey–predator model with parental care for predators. The local stability of the positive equilibrium is analysed. By choosing the two time delays as the bifurcation parameter, the existence of Hopf bifurcation is studied. Numerical simulations show the positive equilibrium loses its stability via the Hopf bifurcation when the time delay increases beyond a threshold.
Simulation and analysis of partial pulse remained jamming to HPRF PD radar
Authors: Sun Zhiyong , Shi Chunjuan , Tian Hailin
Published: January 2022

To solve the problem that the duty cycle of HPRF PD radar is not easy to use the general tow-and-pull jamming, a method of partial pulse remained jamming is proposed. Taking the transmitting signal of PD radar acquired by DRFM as an example, the jamming effect of the signal is simulated and analyzed. The results show that the jamming signal is modulated by the radar signal acquired by DRFM, the jamming signal generated has a strong correlation with the target Echo Signal, and it can effectively jam the HPRF PD radar with less power, which proves the effectiveness of the method.
A large gain variable range, high linearity, lownoise, low DC offset VGAs used in BD system
Authors: Zhang Dianwei , Chu Fei , Wen Wu , Cheng Ze
Published: January 2022

In this paper, a large gain variable range, high linearity, low noise, low DC offset VGAs with a simple gain-dB variable circuit are introduced. In the VGAs chain, the last and the first VGAs employ Bipolar transistors, to improve the linearity and noise characteristics. And the middle three stages VGAs employ MOS transistors. The whole circuitry is designed in 0.35um BiCMOS process, including variable gain amplifiers (VGAs) , fixed gain amplifiers , gain control and DC offset cancellation parts. The automatic gain control loop (AGC) provides a process independent gain variable range of 60dB (including 50dB gain-dB-linearity variable range), with a 200us loop lock time, the VGAs provide a 73dB largest gain, the THD is less than 1% at a 1V(P-P) output level; the equivalent output integral noise is 0.011v/√hz@20MHz bandwidth. The whole area is 1173um*494 um, and the power is 7.1mA at 3.3V signal supply voltage.
Computer simulation of the difference between Lasso and Lars
Authors: Xia Huiyi
Published: January 2022

In order to correct the error that Efron et al pointed out that the modified Lars is a fast algorithm for lasso problem, computer simulation is carried out with data. The simulation results show that when a variable is removed first and then entered in the lasso problem, the variables selected by lasso and Lars cannot be the same. At this time, no matter how to modify the size of the variables selected by Lars, the lasso problem cannot be solved. The computer simulation method is used to correct the errors of Efron et al in this paper, and contribute to development of world data computing.
A novel method for on-chip debugging based on RISC-V processor
Authors: Gao Shan , Wu Dehua , Xiao Wan’ang , Wang Zetao , Yang Zhenghong , Gao Wanlin
Published: January 2022

An on-chip debugging method based on the RISC-V processor is introduced, which simplifies the complicated debugging operation into instructions and improves the debugging efficiency effectively. The method adopts a JTAG interface to realize the debugging functions of the processor, such as running control, software breakpoint, hardware breakpoint and single-step execution. The method was verified by simulation at the RTL level, and the logic synthesis was carried out in SMIC 180nm process library.
Application of blended teaching in public elective courses of design class
Authors: Liu Hui , He Haidi , Zhang Chunhong , Xu Shan
Published: January 2022

The development of education informatization has brought opportunities for teaching reform in colleges and universities, but there are still some shortcomings when applied to public elective courses (PEC). The Blended Teaching mode that combines the advantages of MOOC and SPOC teaching provides a new exploration for improving the teaching effect of public elective courses. This article relies on the “Everybody Loves Design” MOOC national boutique online open course of Chinese universities, and applies the Blended Teaching model to the teaching of “Industrial Design History” course, a PEC in Z colleges and universities. A teaching model including the selection of course teaching platform and teaching resources, teaching implementation, teaching effect evaluation, teaching reflection, etc was constructed. The results show that this model has a positive effect on improving students’ learning interest, learning autonomy and learning effect.
Simulation research on high-speed motor current harmonic elimination methods
Authors: Cui Hong , Gao Youqing
Published: January 2022

A large number of harmonics will be generated in the process of transforming high frequency and high voltage alternating current (AC) into a constant frequency and constant voltage through a power conversion system when the high-speed motor is used as a generator. The phase-shifting reactor is used to eliminate harmonics for high-speed generator power conversion systems, and LCL filter and adjustable inductance filter are used to eliminate harmonics for high-speed motor power supply system in this paper. The adjustable inductance filter can adjust the inductance value in time according to the change of the output frequency of the inverter. The results verify the effectiveness of the methods used, and provide a theoretical basis for the wide application of high-speed motor by simulation.
Power coordination control strategy of microgrid based on photovoltaic generation
Authors: Chen Zhongxiao , Chen Jiarui , Fu Kaiqing , Xue Longkun
Published: January 2022

In order to solve the large-scale grid-connected photovoltaic cells caused by power fluctuations, power quality decline and other issues. This paper proposes and researches a power coordination control strategy for microgrid based on photovoltaic power generation. The principle of photovoltaic cells and the switching of maximum power point tracking and limited power mode are studied. The stability control methods of DC bus voltage, AC bus wire and frequency are studied. The model of microgrid is established and moreover, based on the power of microgrid and the charging state of storage battery, the operation of microgrid is divided into different working modes. The stable operation of microgrid is realized by adjusting the output power of each unit in different working modes. The calculation shows that the control strategy can effectively reduce the power fluctuation in the microgrid and improve the output power of renewable energy. Finally, the feasibility and effectiveness of the proposed methods are verified by experiments.
Research on performance test analysis method of mechanical structure based on measured error / virtual simulation
Authors: Wang Beilei
Published: January 2022

Mechanical errors seriously affect the transmission performance of mechanical structure, especially for high-precision mechanical structure. With the development of virtual simulation technology, the performance test of mechanical structure in virtual environment is gradually applied. Under the background, this paper takes the movable tooth reducer as the research object and puts forward a virtual performance test method by combing test errors with virtual simulation technology. The tooth profile errors of key components of the reducer are obtained by optical scanning, and the simulation test is carried out. Meanwhile, the accuracy of the simulation test is verified by the implementation of vibration test. The results show that both the simulated vibration acceleration and the experimental test vibration acceleration show a double-peak variation trend, and the frequency difference between the two peaks is less than 5%. Therefore, the simulation test method proposed in this paper can effectively evaluate the performance of mechanical structures.
Compiling method of automobile fault diagnosis information
Authors: Wu Guofang , Liu Fujia , Xu Shuquan
Published: January 2022

Automobile fault diagnosis is the most technical content in automobile maintenance. The speed, accuracy and convenience of diagnosis directly affect the maintenance efficiency. Automobile fault diagnosis information is an important reference for finding and solving automobile faults. High quality information is the key to improve technical personnel's judgment and solving faults. In this paper, the methods and examples of fault diagnosis information compilation are given to guide the technical data writers to compile effective fault diagnosis information for automobiles.
Botulinumtoxin – Therapie des Spasmus hemifacialis: Ein
Update
Authors: Jost Wolfgang H. , Laskawi Rainer , Palmowski-Wolfe Anja , Spittau Björn , Urban Peter P.
Published: January 2022

Die Injektion von Botulinumtoxin gilt beim Spasmus hemifacialis (SHF)
mittlerweile als Therapie der Wahl. Alle 3 Botulinumtoxin-A Präparate
sind für diese Indikation zugelassen. Der SHF ist eine häufige
Erkrankung, die gekennzeichnet ist durch unwillkürliche Kontraktionen
der vom Nervus facialis innervierten Muskulatur einer Gesichtshälfte.
Die Symptome können tonisch oder klonisch, intermittierend oder
permanent auftreten. Die Diagnosestellung erfolgt klinisch. Zur
Ausschlussdiagnostik sollte eine Magnetresonanztomografie des Schädels
eingesetzt werden, die einen pathologischen Nerv-Gefäß-Kontakt
nachweisen und alternative Ursachen ausschließen kann.
Kalium jodatum – Wertigkeit bei der Behandlung von
degenerativen Korneaerkrankungen
Authors: Trebin Ernst
Published: January 2022

Degenerative oder entzündliche Erkrankungen der Hornhaut des Auges
könnten verursacht sein durch einen erhöhten Tonus der
Lidmuskulatur, wie der Autor an einigen Fällen belegt. Potenzierte
Kalium-Salze, hier speziell Kalium jodatum, scheinen hilfreich zu sein, diesen
Druck zu lindern und zumindest die Progression dieser Leiden aufzuhalten.
External Validation of the Patient-Reported Villalta Scale for the Diagnosis of Postthrombotic Syndrome
Authors: Kearon Clive , Ng Sara , Rodger Marc A. , Ghanima Waleed , Kovacs Michael J. , Shivakumar Sudeep , Kahn Susan R. , Sandset Per Morten , Mallick Ranjeeta , Delluc Aurélien
Published: January 2022

Introduction The Villalta scale is the endorsed tool to diagnose and grade the severity of postthrombotic syndrome (PTS); however, assessing presence and severity of PTS is time-consuming and relies on both the clinician and patient's assessments. The patient-reported Villalta scale version 2 (PRV2) is a visually assisted form that enables patients to self-assess presence and severity of PTS. Herein, we report on external validation of this tool.

Methods We assessed the agreement and kappa values of PRV2 to diagnose and assess severity of PTS compared with the original Villalta score in a cohort of 181 patients (196 limbs) who participated in the SAVER pilot randomized control trial. Presence of PTS was defined as PRV2 ≥5 or a Villalta score ≥5.

Results PTS prevalence was 42% using PRV2 and 33% using the Villalta scale. The corresponding kappa and percentage agreement were 0.60 (95% confidence interval [CI]: 0.49–0.71) and 81% (95% CI: 76–87), respectively. Kappa values and percentage agreements between PRV2 and Villalta scale increased with increasing severity of PTS. The sensitivity of PRV2 to detect PTS of any severity was 84% (95% CI: 73–92) with a specificity of 79% (95% CI: 71–86).

Conclusion We conclude that the PRV2 is an acceptable tool for diagnosing and grading the severity of PTS.
A review of experiments on stationary bluff body wakes
Authors: Forouzi Feshalami Behzad , He Shuisheng , Scarano Fulvio , Gan Lian , Morton Chris
Published: January 2022

Experimental studies dealing with the wake of isolated stationary bluff bodies are reviewed. After briefly recalling the pioneering works in this domain, the paper focuses on recent research conducted with the latest experimental methods and techniques. The review encompasses a range of topics, including the effects of bluff body geometry (non-circular cross sections and non-uniformity in spanwise direction), steady and unsteady (periodic and non-periodic) inflow conditions, surface proximity (rigid wall, confinement, and water free surface) and non-Newtonian fluids. Focus is brought to the flow physics of the wakes, especially the complex three-dimensional and oscillatory behaviors induced by the periodic vortex shedding phenomenon. The paper aims to offer a critical and systematic review of new knowledge and findings on the subject area, as well as the most frequently adopted experimental techniques. The review also helps identifying knowledge gaps in the literature that need to be addressed in future investigations.
Reciprocal modulation of long noncoding RNA EMS and p53 regulates tumorigenesis
Authors: Wang Chenfeng , Yang Yang , Wu Xianning , Li Jingxin , Liu Kaiyue , Fang Debao , Li Bingyan , Shan Ge , Mei Xinyu , Wang Fang , Mei Yide
Published: January 2022

Significance

As a master transcription factor, the tumor suppressor p53 regulates a variety of cellular processes by modulating target gene expression. Although well known as a transcriptional activator, p53 is also able to repress expression of a number of protein-coding genes. However, it remains largely unknown whether long noncoding RNA (lncRNA) gene repression is involved in the regulation of p53 function. Here, we show that p53 can transcriptionally repress expression of the lncRNA E2F1 messenger RNA (mRNA) stabilizing factor (EMS) and vice versa and that EMS can suppress p53 translation and negatively regulate p53 function. Our study reveals an important double-negative feedback loop that controls p53 activity and provides insights into the mechanisms whereby EMS promotes tumorigenesis.