bluuebunny/crossref_metadata_2025 huggingface dataset:
A combined on-the-fly/interpolation procedure for evaluating energy values needed in molecular simulations
Authors: Karandashev Konstantin , Vaníček Jiří
Published: November 2019

We propose an algorithm for molecular dynamics or Monte Carlo simulations that uses an interpolation procedure to estimate potential energy values from energies and gradients evaluated previously at points of a simplicial mesh. We chose an interpolation procedure that is exact for harmonic systems and considered two possible mesh types: Delaunay triangulation and an alternative anisotropic triangulation designed to improve performance in anharmonic systems. The mesh is generated and updated on the fly during the simulation. The procedure is tested on two-dimensional quartic oscillators and on the path integral Monte Carlo evaluation of the HCN/DCN equilibrium isotope effect.
A flow-based microfluidic device for spatially quantifying intracellular calcium ion activity during cellular electrotaxis
Authors: Cole Joshua , Gagnon Zachary
Published: November 2019

How a cell senses, responds, and moves toward, or away from an external cue is central to many biological and medical phenomena including morphogenesis, immune response, and cancer metastasis. Many eukaryotic cells have internal sensory mechanisms that allow them to sense these cues, often in the form of gradients of chemoattractant, voltage, or mechanical stress, and bias their motion in a specific direction. In this study, a new method for using microfluidics to study the electrotactic migration of cells is presented. Electrotaxis (also known as galvanotaxis) is the phenomenon by which cells bias their motion directionally in response to an externally applied electrical field. In this work, we present a new flow-based, salt bridge-free microfluidic device for imaging and quantifying cell motility and intracellular ion activity during electrotaxis. To eliminate salt bridges, we used a low nanoliter flow rate to slowly drive Faradaic waste products away from and out of the electrotaxis zone. This cell migration zone consisted of an array of fluidic confinement channels approximately 2 μm in thickness. This confined height served to insulate the migrating cells from the electric field at the top and bottom of the cell, such that only the two-dimensional perimeter of the cells interacted with the electrical source. We demonstrate the ability to quantify the electrotactic velocity of migrating Dictyostelium discoideum cells and show how this confined design facilitates the imaging and quantification of the ion activity of electrotaxing cells. Finally, by spatially imaging the calcium concentration within these cells, we demonstrate that intracellular calcium preferentially translocates to the leading edge of migrating Dictyostelium cells during electrotaxis but does not exhibit this behavior during migration by chemotaxis in a gradient of cyclic adenosine 3′,5′-monophosphate or when cells freely migrate in the absence of an external cue.
Tryptophanyl-tRNA synthetase (WARS) expression in uveal melanoma – possible contributor during uveal melanoma progression
Authors: Yang Pan-Pan , Yu Xiao-Hui , Zhou Jiao
Published: November 2019

This study aimed to explore the influence of Tryptophanyl-tRNA synthetase (WARS) expression on the proliferation and migration of uveal melanoma (UM) cells, and the potential mechanisms. Bioinformatics analysis based on Gene Expression Omnibus (GEO) database showed that WARS expression in metastatic cancer was significantly higher than that in no-metastatic group. Kaplan-Meier analysis based on The Cancer Genome Atlas (TCGA) database showed that high WARS expression was associated with lower survival. Biological function experiments showed that overexpression of WARS in OCM-1A cells can promote cell proliferation, migration, and invasion, whereas knockdown of WARS in C918 cells showed the opposite effect. Finally, we observed that the up-regulation of WARS induced the activation of phosphatidylinositol 3-kinase/AKT (PI3K/AKT) signaling, whilst depletion of WARS resulted in opponent outcomes. Taken together, our results illustrated that WARS was overexpressed in UM cells and contributed to the viability and motility of UM cells via modulating PI3K/AKT signaling pathway.
Small RNA‐sequence analysis of plasma‐derived extracellular vesicle miRNAs in smokers and patients with chronic obstructive pulmonary disease as circulating biomarkers
Authors: Sundar Isaac Kirubakaran , Li Dongmei , Rahman Irfan
Published: November 2019

Extracellular vesicles (EVs) play a vital role in normal lung physiology to maintain homeostasis in the airways via intercellular communication. EVs include exosomes and microvesicles, and are characterized by their phospholipid bilayers. EVs have been recognized as novel circulating biomarkers of disease, which are released by different cell types. In this study, we used different EV isolation and purification methods to characterize the plasma‐derived EV miRNAs from non‐smokers, smokers and patients with COPD. A small RNA sequencing (RNA‐seq) approach was adapted to identify novel circulating EV miRNAs. We found that plasma‐derived EVs from non‐smokers, smokers and patients with COPD vary in their size, concentration, distribution and phenotypic characteristics as confirmed by nanoparticle tracking analysis, transmission electron microscopy, and immunoblot analysis of EV surface markers. RNA‐seq analysis confirmed the most abundant types of small RNAs, such as miRNAs, tRNAs, piRNAs snRNAs, snoRNAs and other biotypes in plasma‐derived EVs. We mainly focused on miRNAs as novel biomarkers in smokers and patients with COPD for further analysis. Differential expression by DESeq2 identified distinct miRNA profiles (up‐regulated: miR‐22‐3p, miR‐99a‐5p, miR‐151a‐5p, miR‐320b, miR‐320d; and down‐regulated: miR‐335‐5p, miR‐628‐3p, miR‐887‐5p and miR‐937‐3p) in COPD versus smokers or non‐smokers in a pairwise comparison. Gene set enrichment analysis (GSEA) of differentially expressed miRNAs revealed the top pathways, gene ontology and diseases associated with smokers and patients with COPD. We selectively validated miRNAs in EVs isolated from BEAS‐2B cells treated with cigarette smoke extract by quantitative PCR analysis. For the first time, we report that plasma‐derived EV miRNAs are novel circulating pulmonary disease biomarkers. Thus, molecular profiling of EV miRNAs has great translational potential for the development of biomarkers that may be used in the diagnosis, prognosis, and therapeutics of COPD.
Glutamylation of deubiquitinase BAP1 controls self-renewal of hematopoietic stem cells and hematopoiesis
Authors: Xiong Zhen , Xia Pengyan , Zhu Xiaoxiao , Geng Jingjing , Wang Shuo , Ye Buqing , Qin Xiwen , Qu Yuan , He Luyun , Fan Dongdong , Du Ying , Tian Yong , Fan Zusen
Published: November 2019

All hematopoietic lineages are derived from a limited pool of hematopoietic stem cells (HSCs). Although the mechanisms underlying HSC self-renewal have been extensively studied, little is known about the role of protein glutamylation and deglutamylation in hematopoiesis. Here, we show that carboxypeptidase CCP3 is most highly expressed in BM cells among CCP members. CCP3 deficiency impairs HSC self-renewal and hematopoiesis. Deubiquitinase BAP1 is a substrate for CCP3 in HSCs. BAP1 is glutamylated at Glu651 by TTLL5 and TTLL7, and BAP1-E651A mutation abrogates BAP1 glutamylation. BAP1 glutamylation accelerates its ubiquitination to trigger its degradation. CCP3 can remove glutamylation of BAP1 to promote its stability, which enhances Hoxa1 expression, leading to HSC self-renewal. Bap1E651A mice produce higher numbers of LT-HSCs and peripheral blood cells. Moreover, TTLL5 and TTLL7 deficiencies sustain BAP1 stability to promote HSC self-renewal and hematopoiesis. Therefore, glutamylation and deglutamylation of BAP1 modulate HSC self-renewal and hematopoiesis.
Application of Convolution Optimization Algorithm Based on Neural Network in Web Attack Test
Authors: Nan Li , Sheng Guan
Published: November 2019

As society enters the process of information development, the demand for information services in various industries is increasing. Various types of software based on Web services have been widely used in various system platforms, and also bring greater security service requirements. All kinds of network hackers will cause serious damage to the attacks on port access information data. Based on the security of Web services, the paper starts with the characteristics of Web attacks, and studies the structure scheme of Web information feature extraction as a vector model, which is brought into the neural network to calculate by convolution optimization algorithm. The feature vector extraction proposed in the paper is a multi-dimensional training method for convolution input layer. It is suitable for information structure changes in different network environments. By setting the nodes of the Web network as elements of neurons, the connection of several neurons for the model matrix is selected to simulate the effect against web attacks. In the test process, the multi-dimensional space of the proposed algorithm is superior to other algorithms, and has the characteristics of adaptability and controllability. The result of the analysis proves the accurate effect of the research content.
Research of the Attractiveness Factors of MOBA Mobile Games Based on Evaluation Grid Method
Authors: Qi Shen , Chun-Chih Chen , Shu-Ming Wu
Published: November 2019

The purpose of this paper is to explore the game player’s experience and preference for MOBA (multiplayer online battle arena) mobile games, and to identify the attractiveness quality factors that affect the MOBA mobile game design. In this paper, Honor of Kings is the subject of discussion and research; qualitative research methods are adopted to go deeper into interviews involving deeper gamers; the attractiveness of the MOBA mobile game is summarized; the evaluation grid is constructed and analyzed, which provides a reference for the subsequent MOBA mobile game design and improvement.
A Framework for Multi-Variant Execution Environment
Authors: Junchao Wang , Zhenwu Liu , Hao Liu , Jianmin Pang
Published: November 2019

Software diversity has been proven to be an effective approach to enhance system security. To make the best of the advantage brought by software diversity, a multi-variant execution environment is needed. However, although some MVEEs have been proposed, most of them are either too simple or only focusing one aspect which limits their widely adoption in industry. In this paper we propose a framework for multi-variant execution environment to enhance the security of software systems. The framework addresses different aspects when implementing a MVEE and can help to make the best of software diversity to enhance the system’s security.
A comprehensive study on robustness of HOG and LBP towards image distortions
Authors: Ren Hanwen
Published: November 2019

Autonomous driving has been attracting increasing attention in modern society. Lots of work have been conducted in this field focused on vehicle detection. Existing vehicle detection algorithms are developed based on the assumption that data come with good quality. However, the physical world is never free of distortions. In this paper, a comprehensive review study of vehicle detection feature extractors is conducted to test and compare their robustness towards image distortions in practical applications. The two tested mainstream feature extraction methods are Histogram of oriented gradient (HOG) and Local Binary Pattern (LBP). The specific tested distortion type includes Gaussian noise, Salt and Pepper noise, Gaussian blur, change of color saturation, change of contrast and change of brightness. The review test result shows that: 1). Gaussian noise has negative effects on both HOG and LBP; 2). A certain level of Gaussian Blur and decreasing contrast can do help to increase detection accuracy for LBP, HOG is not affected by them; 3). Color Saturation change, increasing contrast and brightness change will not affect the performance of both feature extraction methods too much when the intensity of these distortions stays in reasonable range; 4). The effect of Salt and Pepper noise is still uncovered based on our experiments.
The Problem of Hopf Bifurcation in a Special Three-dimensional System
Authors: Huang Ruiping , Deng Lei , Wang Na , Gao Cuicui
Published: November 2019

This paper, by combining the central manifold theorem with the plane bifurcation theory, conducted a research on the homoclinic bifurcation limit circles of a class of three-dimensional system. The conditions for the existence of stable limit circles were given, and the results of the existing plane systems were generalized.
Chaos Synchronization of a Class of Fractional-order Economic Systems with Time-delay
Authors: Lu Ya , Zhao Xiaoshan , Guo Yongfeng , Xu Tao
Published: November 2019

In this paper, the chaos Synchronization problem of a class of economic systems with time delays was studied on Lyapunov stability theory and fractional-order calculus theory. Two methods of fractional-order active sliding mode control and single controller sliding mode control are used, and the differences between the two methods are compared. Numerical simulations verify the feasibility of the two methods. Results show that active sliding mode control scheme is highly resistant to interference.
Trajectory Design and Optimization Tool for Deep Space Exploring
Authors: Zhang Jin , Wang Zhongsheng , Zhou Jianyong
Published: November 2019

The trajectory design and optimization based on astrodynamics plays an important role in the mission design of deep space exploring. A convenient tool for trajectory design and optimization of deep space exploring has been developed, which consists of three major functional modules. The first module can help design and optimize the trajectory using gravity-assist maneuvers, the second module is used to design and optimize the trajectory using low-thrust propulsion, and the third module helps design the low-thrust gravity-assist mixed trajectory. Moreover, friendly user interfaces are implemented for the problem inputs, and the results are shown by both the data reports and some customizable figures.
Global asympototic stability of predator-prey systems with stage structure and nonlinear birth rate
Authors: Huang Xinyu , Yue Qin
Published: November 2019

A predator-prey model with nonlinear birth rate and stage structure on prey species is revisited in this paper. By using the comparison theorem of differential equation and constructing some suitable Lyapunov function, we are able to show that the conditions which ensure the locally asymptotically stable of the equilibria is enough to ensure its globally asymptotically stable. Finally, the obtained results have substantially improved and extended the corresponding results of predecessors.
Empirical Analysis of Carbon Price Based on EGARCH
Authors: Mou Yunhan
Published: November 2019

The carbon trading market has been increasingly heated for more than a decade, and its market participants and market rules are not exactly the same as traditional stock or exchange rate markets. Based on the mature and efficient GARCH series model, this thesis analyzes the rules of the carbon trading market. Starting from the actual data, it studies the conclusions and models applicable to carbon trading market from both qualitative and quantitative perspectives.
Research on Failure of Tee Pipe Based on AutoPIPE
Authors: Ni Lingying , Zhen Qiang , Li Bing
Published: November 2019

During the construction of a tunnel beneath a buried oil pipeline, leakage occurred in the tee near the elbow due to accidental collision of construction equipment on the pipeline. In order to analyze the failure reason of tee near elbow, based on the interaction mechanism between ideal elastic-plastic soil and pipeline, the pipeline model was established by using the method of equivalent external load with uniform load, and the pipeline simulation and stress analysis were carried out by using AutoPIPE software. The results show that the allowable stress is not exceeded in the section directly subjected to external loads, but the actual stress value exceeds the allowable stress value due to the concentrated stress near the elbow, which is the main reason for the failure of the tee.
Stability Analysis of an Online Game Addiction Model with Relapse and Time Delay
Authors: Guo Youming , Li Tingting
Published: November 2019

In order to simulate the process of game communication, a SIPQ model with relapse and time delay is constructed, which includes susceptible, infective, professional and quitting compartments. We also consider that the direct transfer from the susceptible individuals to the professional individuals. The global dynamics of the model are determined by the basic reproduction number R0. The locally asymptotical stability of disease-free equilibrium is derived.
Analysis of Uncertainty and Advanced Solutions in Enterprise Supply Chain Management Based on Game Theory
Authors: Lixinyu
Published: November 2019

The so-called supply chain refers to the network chain structure formed around the core enterprises, namely suppliers, manufacturers, distributors, final customers, logistics service providers and even supplier suppliers and distributors. An effective supply chain system allows companies to plan and utilize resources from a global perspective. Through the construction of management strategies, management processes, partnerships and information systems, real-time monitoring and regulation of the operation of various business activities within the enterprise. Fundamentally speaking, whether the supply chain node enterprises establish cooperative partnership is a game problem between node enterprises. We need a lot of practical support, more efforts and research work. Only by establishing long-term strategic partnership among supply chain node enterprises can a win-win situation be created and higher profits be brought to enterprises. That is to say, to achieve collective rationality on the basis of individual rationality and to achieve optimal cooperation.
Microstructure and tensile properties analysis of a long-diameter nozzle flowmeter
Authors: Ren Facai , Zhang Mingxian , Tang Xiaoying
Published: November 2019

The tensile properties of materials used in flowmeters at room temperature and high temperature were studied. The tensile tests were conducted in the range of 23 °C to 600°C and strain rate 0.1s−1. The fracture morphology was analyzed by scanning electron microscope. The results show that the microstructures are ferrite and pearlite. The content of each element meets with the corresponding standard.
Performance analysis of a venturi flowmeter
Authors: Ren Facai , Wu Xinghua , Tang Xiaoying
Published: November 2019

The mechanical properties, microstructure and chemical composition of a venturi flowmeter were investigated. The tensile tests were conducted at 23 °C and 520°C with different strain rates. The fracture surface of tensile specimens was analyzed by scanning electron microscopy. Microstructure of the venturi flowmeter material was analyzed by optical microscope. The results show that the chemical constituents meet the requirements of relevant standards.
Research On LDPC-DFH Code Modulation And Demodulation System Based On Hard Decision Decoding
Authors: Zhang Chunming , Tian Minghao
Published: November 2019

In order to reduce the bit error rate of differential hopping transmission, differential frequency hopping (DFH) is combined with low density parity check code (LDPC). On the basis of not adding more system complexity, the hard decision bit inversion algorithm (BF) and weighted error check based bit inversion algorithm (WVBF) are proposed to decode LDPC-DFH system. The check matrixes of different generation methods are used respectively. The BF decoding method and WVBF decoding method are used to simulate the Gaussian channel and Rician channel. The influence of different decoding methods on the bit error rate is discussed. The simulation results show that the BER of the DFH system with LDPC code is lower than that of DFH without LDPC, and the WVBF algorithm is better than the BF algorithm.
Design of Traffic Monitoring System Based on Video Detection
Authors: Hong Yu
Published: November 2019

Traffic monitoring system is an important means to ensure the safe operation of traffic. According to the characteristics of road traffic monitoring environment, a real-time traffic monitoring system is designed by using image processing, computer vision, pattern recognition and other technologies. Experiments show that the system can effectively detect various typical traffic incidents and traffic operation parameters, and provide a favorable guarantee for traffic safety.
Application of DRT in College English Reading Teaching
Authors: Meng Xiang
Published: November 2019

Discourse Representation Theory is a dynamic semantics theory (DRT). It breaks away from the restriction of first-order predicate logic and extends the processing object to discourse above a sentence. The study of natural language by DRT involves not only the truth condition of sentences, but also the specific context, which is in line with the cognitive process of understanding language. The application of DRT in College English reading teaching helps students understand the cognitive relationship between sentences in a text and helps students understand the connotation of a text.
Construction of Multi-evaluation System of Practical Tourism Korean Flip Classroom Teaching Based on CIPP
Authors: Yi Dong
Published: November 2019

The reversed classroom teaching mode has attracted much attention because of its subversion of the teaching process and the cultivation of students’ various abilities. Due to the free learning environment and perfect resource support, the reversal of classroom teaching mode has achieved fruitful results. In the process of implementation and promotion of tourism Korean flip classroom, some problems have gradually emerged. The lack of evaluation criteria has become a major problem faced by tourism Korean flip classroom teaching mode. CIPP evaluation model, which emphasizes process improvement and process evaluation, and teaching feedback, is especially suitable for the needs of educational reform activities for educational evaluation, and also fits in with the characteristics of overturning the diversity of classroom teaching objectives and the advancement of teaching process. This paper studies the evaluation system of tourism Korean language teaching based on flipped classroom, constructs a multi-evaluation system of students’ learning in flipped classroom based on CIPP, probes into the meaning and classification of tourism Korean language teaching evaluation, and analyses the multi-evaluation model.
Research on Color Design in Interactive Animation Design of Multiculturalism in the Information Age
Authors: Jingjing Zhao
Published: November 2019

Interactive animation design, as a branch of the animation field, has received much attention in recent years. From web pages to personal operating systems, more and more interactive designs are emerging in people’s lives. As an important part of the interactive animation design field, rich color design will surely enter the designer’s vision in the field of interactive animation design. In this paper, the multi-culture of information age integrates the basic concepts and characteristics of interactive animation, and illustrates the visual turn of interactive animation aesthetic objects with specific cases. Combined with the technical and cultural characteristics of interactive animation, this paper expounds interactive animation. Virtual interaction. Animate the aesthetic experience and bring it to the participants. A more realistic immersive experience that analyzes the use of color design in interactive animation design.
Integrated scheduling methods of maintenance support resource
Authors: Guan Chongchong , Lu Hui , Liu Yaxian
Published: November 2019

Maintenance support resource scheduling (MSRS) problem has attracted increasing attention in modern battle. Its objective is minimizing execution time of allocating multiple resources from multiple supply centers to tasks. As a NP-hard problem, there exist various constraints in the MSRS problem, including resource demands of tasks, resource reserves of supply centers and transport paths constraint. In this paper, we first build two models taking route planning and resource scheduling into consideration simultaneously. Then, with cutting plane approach and dual algorithm, we can obtain the optimal scheduling schemes corresponding to two models. Besides, the performance of the two approaches are verified with different scale instances.
CIRCULARITY: A Metric for Region Template Selection in Airborne Vision Navigation
Authors: Hua Haiyang , Shi Zelin , Liu Yunpeng
Published: November 2019

Reliability template is a key factor of airborne vision navigation system. This paper proposes a new metric for region template selection. Firstly, a measurement model for uncertainty and inaccuracy of edge feature is given in detail. Furthermore, the influence of spatial distribution of edge features of correct recognition probability is analyzed in statistical probability theory. Then an “ideal” spatial distribution of region template which is the most easy to be recognized is proved by extreme-case analysis. Finally, a new metric is proposed by calculating the shape distance from this “ideal” spatial distribution, called CIRCULARITY, which can be deemed as “geometry self-similarity” to one target. The validity of new metric is experimentally demonstrated by using real ground targets. The results show that the new metric can meet the requirements of matching area selection and generating template.
Vehicle and Parking Space Detection Based on Improved YOLO Network Model
Authors: Ding Xiangwu , Yang Ruidi
Published: November 2019

YOLO has a fast detection speed and is suitable for object detection in real-time environment. This paper is based on YOLO v3 network and applied to parking spaces and vehicle detection in parking lots. Based on YOLO v3, this paper adds a residual structure to extract deep vehicle parking space features, and uses four different scale feature maps for object detection, so that deep networks can extract more fine-grained features. Experiment results show that this method can improve the detection accuracy of vehicle and parking space, while reducing the missed detection rate.
An Ontology Constructing Technology Oriented on Massive Social Security Policy Documents
Authors: Gang Liu , Hanmo Zhang , Wangyang Liu , xu Cheng , Hanwen Zhang
Published: November 2019

Because of the huge number of policy documents in the field of social security, there is a need to manage these information. In this paper, ontology is used to represent and store information in files. In order to ensure the accuracy of ontology structure, this paper first constructs ontology framework manually, and then extends ontology framework by the inclusion relationship between attribute set and object set. At the same time, this paper adopts the idea of statistics and rules in the field of natural language processing, extracts hierarchical and non-hierarchical concepts from the lexicon of social security field to construct ontology, and then puts forward the statistical models of concept phrase vector and high-frequency phrase vector. The experimental results show that the semi-automatic ontology construction process in the field of social security can effectively propose social security ontology from a large number of policy documents. The experimental results play a reference role for ontology construction in other fields.
Research on Two Types of Estimation Algorithms in Carrier Tracking Loop
Authors: Qi Hangtian , Zhang Xiaolin
Published: November 2019

This paper analyzes two estimation algorithms in the carrier loop, i.e. maximum likelihood estimation (MLE) and modern filtering based on Bayesian recursion. The limitations of the MLE algorithm are pointed out by establishing the MLE model. In addition, several modern filters based on Bayesian recursion are analyzed. In this process, the article draws two inferences affecting high dynamics and low signal-to-noise ratio (SNR) carrier tracking from two aspects of state equation and measurement equation. Thus, the optimal algorithm using unscented Kalman filter (UKF) is proposed by the inferences mentioned. at the end, simulation results demonstrate the combined strong tracking algorithm has advantages in case of high dynamic and low SNR.
The Definition, Equation and Application of the Varied Water Temperature Heat
Authors: Yang Dongfang , Zhu Sixi , Fan Bailing , Su Chunhua , Yang Xiuqin
Published: November 2019

Based on water exchange, the horizontal and vertical variation of water temperature heat were proposed by the author, and their definitions and equations were determined in this paper. According to the water temperature of Jiaozhou Bay in May, August and October of 1979, the horizontal and vertical variation of water temperature heat at surface and bottom were calculated. Besides, the corresponding diagrams were obtained. The horizontal variation showed that in May, August and October, from inside waters to bay mouth, then to outside waters, the horizontal decrease amount of water temperature heat reached 0.05-0.82% at surface and 0.00-7.62% at bottom, less than 1.00%. Even in the hottest season, it was less than 12.00%. Hence, spatially and temporally, when waters exchanged at surface and bottom, the heat loss was low. In this way, the heat could be transported for long distance. The vertical variation showed that in inside waters, the vertical decrease amount at surface and bottom reached 13.27% in summer, but 2.47-3.45% in spring and autumn. Whereas, in bay mouth, it reached 13.59% in summer and 1.66% in spring. It became vertical increase amount of 0.05% in autumn. In outside waters, from spring to summer, further to autumn, the vertical decrease amount decreased from 9.91% to 6.32%, further to 0.00%, respectively.
High precision 3D measurement method of pipeline on complex working conditions research
Authors: Lu Wei , Liu Xiang
Published: November 2019

The research object of this paper is high-precision 3D structure measurement of thin pipe workpiece with working temperature ranged from -50 °C to +70 °C and pipe diameter range from 20 mm to 100 mm. Measurement method is based on the principle of circular structure light vision detection. Due to the strict temperature environment requirement and limited measurement space of the inner surface of pipeline. A CMOS camera module based on customized optical lens is designed. Matched with camera temperature compensation device. Motion guide rail of telescopic arm is equipped with high precision servo motor and grating ruler are used for accurate measurement. Experimental results show that the measurement system meets the design requirements of accuracy ⩽ 0.02 mm, repeatability ⩽ 5% FS (0.5 mm), and strain test error ⩽ 5%.
Research on Improving Artillery Firing Accuracy by Using Meteorological Data along Ballistic Trajectory for Artillery Firing
Authors: Zhang Zhiyuan , Liu Yuwen , Li Jun , Jiang Ming
Published: November 2019

In traditional artillery shooting, meteorological information is provided by meteorological unit, but because of the inconsistency between meteorological observation sites and shooting sites, there are errors in meteorological data, which affects shooting accuracy. In order to reduce the influence of meteorological data errors on firing accuracy, it is proposed to acquire multi-meteorological data along the ballistic trajectory by using the dropsonde carried by the UAV, and calculate the meteorological data along the ballistic trajectory for artillery firing. Through simulation calculation, using meteorological data along the ballistic for artillery firing can effectively improve firing accuracy.
Study on the Impact of Altitude on the Hitting Accuracy of Laser Terminal Guided Projectile and Its Improvement
Authors: Liu Yuwen , Jiang Ming , Zhang Zhiyuan , Duan Yanan
Published: November 2019

Aiming at the phenomenon of low firing accuracy and low hit probability of guided projectiles in Plateau area, based on the differential equation of kinematics of guided projectiles, the variation and regularity of hit range at different altitudes are simulated and calculated. The measures to improve hitting accuracy are proposed and simulated.
Numerical analysis of three θ methods for neutral stochastic delay differential equations
Authors: Li Xiuping , Hong Huifen
Published: November 2019

This article focus on the numerical analysis of stochastic θ-method, split-step θ method and one-leg θ method for neutral stochastic differential equations with time lag. When some stability conditions are met, the three θ methods turned out to be mean-square stable asymptomatically. From the numerical analysis, we can see that the asymptomatically mean-square stability for both linear and nonlinear stochastic differential equations depends on the step size h and parameter θ, which numerical analysis are based on stochastic θ-method, split-step θ method and one-leg θ method.
Numerical study on Vectoring the primary flows with dilator using microjet actuators
Authors: Gao Feng , Zhang Qian , Chen Fengli , Zhang Chengtao
Published: November 2019

The synthetic flow field of Vectoring control of a primary flows with dilator using microjet actuators was Numerical studied by the overall flow field calculation model-X-L model. The result shows that the primary flows with dilator deflected larger than no one. And the angle of dilator has an optimal value. The reason of primary flows deflected was analyzed. There are three stage sections that the “low pressure closed reticular flow region” results in non-equilibrium of pressure along the primary jet’s orifice; the microjet roll sucked and the primary flow coupled in each other in the near catchment area; the microjet and the primary flow coupled in each other in the far catchment area.
Quantum Entanglement Criterion for Rank of Block Matrix Vector Group Based on Density Matrix
Authors: Liu Guangrong
Published: November 2019

The determination of quantum state separability is the basic problem of quantum entanglement theory. By judging the rank of the matrix vector group formed by the density matrix block, the necessary and sufficient conditions for the separation of quantum pure States are given, and the necessary conditions for the separation of quantum mixed States are given, too. In the composite system 2 × 2, the rank of the vector group corresponding to the divisible pure state is 1, and the rank corresponding to the entangled state is 4.
Numerical simulation method for vibration response of blasting excavation of deep-buried rock mass
Authors: Xiaorui Xiang , Liang WU , Tianci LI , Jiayi HU , Yang Chen
Published: November 2019

In order to solve the safety problems caused by in-situ stress unloading and blasting impact in blasting excavation of deep-buried rock mass, the initial stress field and dynamic response of excavation unloading of deep-buried rock mass are calculated by ANSYS implicit and explicit solver. The results show that the stress wave induced by in-situ stress unloading diffracts at the foot of the wall and produces stress wave superposition in the surrounding rock above the wall. The vibration of surrounding rock caused by excavation of buried rock mass consists of blasting shock and ground stress unloading. With the increase of excavation depth, the vibration of surrounding rock caused by ground stress unloading exceeds blasting effect and gradually dominates the measured vibration.
Study of the classroom arrangement problem based on ant colony algorithm
Authors: Xiong Ziqi , Wang Bei , Geng Yuejie , Zhang Zhigang
Published: November 2019

In this paper, the ant colony algorithm is presented to optimize the university classroom arrangement and solve the corridor congestion problem. Firstly, the classroom capacity, the course time periods and the distance between classrooms are considered, and then the ant colony algorithm is applied to the corridor congestion problem by minimizing the distance between the students’ classroom of the courses. The experimental results show that the ant colony algorithm is able to construct feasible solutions and solve the classroom arrangement problem.
An improved Gaussian Mixture Model algorithm for background representation
Authors: Wang Ping , Dong Shaoxiong
Published: November 2019

Initializing a background frame for Gaussian Mixture Model requires no moving objects in the background scene. In this paper, in order to obtain an initial frame when there is a moving object in the background scene, filtering algorithm is used for background frame initialization. This paper proposes an improved method for updating Gaussian mixture models. In the initial stage of the GMM, the update rate of the mean and variance is taken as a larger value, so that the model mean and variance update speed becomes faster, and the model learning speed is accelerated; after training for a period of time with a large update rate, let The mean update rate is unchanged, and the variance update rate becomes smaller, so that the background model can be more stable.
A Synchronization Algorithm for Burst-Mode MR-OFDM System of 802.15.4g
Authors: Zhao Yahong , Zhao Xu , Zhang Yubing , Tang Xiaoke , Dong Mingke
Published: November 2019

This paper presents a refined coarse frame synchronization algorithm for long repeated-sequence based preamble STF (short training field) in burst mode MR-OFDM system of 802.15.4g which is of low decision delay and resistant to timing uncertainty due to metric plateau. The precision of coarse timing and frequency offset estimation is improved. A fine symbol timing and frequency offset estimation algorithm based on LTF (long training field) is also proposed which provides an overall solution for the synchronization of burst mode MR-OFDM system. Simulation results are given to provide reference for implementation.
Research on Shipping Scheme of Express by High-speed Railway Passenger Train
Authors: Yang Jiayi , Zhao Qilan
Published: November 2019

High-speed rail express mainly uses the remaining space of passenger trains for transportation from the originating station to the terminal station. The number of shipments at the intermediate station of the train is small, but the transportation demand at them is also considerable. If the high-speed rail express shipping plan considers the express delivery demand of the intermediate station, it can help the high-speed rail express operation enterprise to increase profits by coordinating the demand of the stations along the global optimal angle. This paper considers the short-term stop time of the high-speed rail, limited train loading space, different timeliness requirements of high-speed rail express products, etc., and establishes the mathematical model of the high-speed rail express shipping scheme. This paper predicts the demand for various products of Beijing-Shanghai high-speed rail express in 2025 and calculate the transportation capacity of B-S HSR. The shipping plan obtained verifies the effectiveness of model.
Grey Evaluation Method of Radar Equipment Supportability Based on G1
Authors: Shi Duanyang , Hu Bing , Chen Jiaxun , Ma Yanyan
Published: November 2019

A comprehensive evaluation method combining grey system theory and order relation analysis (G1) is proposed to solve the problems of various and uncertain factors affecting the supportability of radar equipment. Firstly, according to the requirement of radar equipment supportability, the evaluation index system of radar equipment supportability is constructed. Secondly, order relation analysis (G1) is used to determine the weight coefficient of each evaluation index. Finally, the grey scale and whitening weight function are determined by expert scoring value and grading standard, and the guarantee grade of radar equipment is obtained by using grey evaluation model. The accuracy of this method is verified by an example, which provides a new idea for the supportability evaluation of radar equipment.
Research on ultra-wideband electromagnetic pulse irradiation effect and protection method of Unmanned Aerial Vehicle
Authors: Shukun Gao , Erwei Cheng , Yazhou Chen , Yuming Wang
Published: November 2019

The data link is an important guarantee for the Unmanned Aerial Vehicle (UAV) equipment to complete its battlefield functions. Its anti-electromagnetic pulse interference capability directly affects the airborne communication security. Ultra-wideband (UWB) electromagnetic pulse has become an important source of electromagnetic interference due to its high power, wide frequency band and wide interference target. In order to verify the reliability of UAV data link communication under UWB electromagnetic pulse irradiation conditions, the UWB electromagnetic pulse irradiation effect experiment of UAV was carried out, and the mechanism of “lost lock” effect of UAV data link was analyzed. The experimental results show that when the UWB electromagnetic pulse irradiation intensity reaches 140 kV / m, it will cause hardware damage to the UAV, and found that its internal sensitive device low noise amplifier is damaged. In response to this, the comprehensive design of the electromagnetic protection measures for the UAV was carried out, laying the foundation for the next step to strengthen the electromagnetic protection of the UAV.
Design of a Novel Broadband Microstrip Line-Suspended Microstrip Line Transition Circuit
Authors: Niu Heyi , Wu Jingfeng , Wang Zhiqiang
Published: November 2019

Based on the application requirements of the suspended microstrip circuit, a novel broadband microstrip line-suspended microstrip line transition circuit is designed in this paper. The transition structure uses “V-grooved” ground structure to realize the transition from microstrip line to suspended microstrip line in the direction of electric field, and uses gradient signal line for impedance matching to expand the bandwidth. The final simulation results show that the echo loss of the structure is better than 15 dB and the insertion loss is less than 0.165 dB in the frequency range of 0-40 GHz, and the sensitivity of circuit performance to circuit size is low. This design combines the ultra-low loss suspension line with the most commonly used microstrip line circuit, and has the advantages of broadband, low insertion loss, easy processing and compact structure. It improves the application scope of the suspension microstrip circuit and can be better integrated with other circuits or systems.
Effect of Signal Reflection on the Performance of High-density Ceramic Package Transmission Lines
Authors: Boxian Wu , Hongyu Zheng , Xiaojun Zhang
Published: November 2019

In this paper, the reflection problem caused by the sudden change of characteristic impedance caused by the complex interconnection of laminations and via, pads and interconnects in high-density ceramic package is studied, and the transmission line design optimization is realized. In high-density ceramic package designs, reflections severely affect the performance of the transmission line. Based on the relevant theory of transmission line transmission, the reflection problem is studied by modeling and simulation methods. The transmission line model is constructed by using electromagnetic simulation software, and the obtained return loss represents reflection. The method of controlling variables is used to analyze the factors that affect the reflection. The simulation results show that the anti-pad has a significant impact on the performance of the transmission line, and the influence of via and pads on the performance of the transmission line is second.
Research on Key Test Methods of the Smart Meter Software Based on Failure Modes
Authors: Leping Zhang , Baoshuai Wang , Shanshan Hu , Yi Luo , Yi Pan , Zhanhe Wu
Published: November 2019

Software quality has become a key factor affecting the overall quality of the smart meter. To improve the reliability of the smart meter software, analyzed the typical failure modes and mechanism based on actual failure cases of smart meters. For different software failure modes, the test techniques were studied from the perspective of the software development cycle. Designed a test program of the smart meter software and provided automated test tools to improve the breadth and depth of the software test and improve the product reliability.
Research status of hyperspectral anomaly target detection
Authors: Zhang Yan , Hua Wenshen , Huang Fuyv , Wang Qianghui , Suo Wenkai
Published: November 2019

Hyperspectral imagery is a three-dimensional image of “image-spectrum merging”. Its spectral resolution reaches nanometer level, which provides a theoretical basis for classification, unmixing and target detection of features. Because the anomaly target detection does not need to obtain the prior knowledge of features, it is more widely used in practice and has become a research hotspot. This paper summarizes the development status of anomaly target detection algorithms at home and abroad, and expounds the existing problems. Finally, the development trend of anomaly target detection is prospected.
Research on Fatigue Life of Lifting Equipment Based on Double Linear Cumulative Damage Theory
Authors: Chen Li , Ding Keqin
Published: November 2019

The lifting equipment is applied more and more extensively with the fast development of economy. The fatigue and safety problems of lifting equipment in service are more and more prominent. The stress spectrum monitoring data was analyzed by the two parameters rain-flow counting method for fatigue analysis. The calculation for cumulative damage and prediction for fatigue life of the lifting equipment’s hot region were calculated based on the double linear damage theory and the nominal stress method. According to the engineering application results, the real crack generation time is consistent with that of our estimation, which demonstrates that our prediction model and method for fatigue life are effective and give a method for the evaluation of the lifting equipment’s fatigue life. The double linear damage theory is recommended for use in fatigue and damage prediction of lifting equipment in service.
Analysis of Dynamic Properties for Double-swing Anti-galloping device Used in Long-span Section over Han River in 1000 kV UHV AC Jingmen-wuhan Transmission Line
Authors: Bin Zhao , Lichun Zhang , Jialun Yang
Published: November 2019

The anti-galloping combination mode of “double-swing anti-galloping device + cable cleat rotary spacer” is the anti-galloping scheme which is frequently used at present. In order to enhance the anti-galloping capability of Long-span Section over Han River in 1000 kV UHV AC Jingmen-wuhan Transmission line, this text will research the influence of pendulum’s theoretical length on dynamic properties for the double-swing anti-galloping device, which is widely used in the ultra-high voltage line. Theoretical analysis shows that total mass rate of anti-galloping devices, including double-swing anti-galloping device as well as cable cleat rotary spacer, should reach 6.5%, and the pendulum’s theoretical length shoud be 650mm, then the theoretical anti-galloping capability of whole system became optimized.