bluuebunny/crossref_metadata_2025 huggingface dataset:
A machine learning framework for solving high-dimensional mean field game and mean field control problems
Authors: Ruthotto Lars , Osher Stanley J. , Li Wuchen , Nurbekyan Levon , Fung Samy Wu
Published: April 2020

Mean field games (MFG) and mean field control (MFC) are critical classes of multiagent models for the efficient analysis of massive populations of interacting agents. Their areas of application span topics in economics, finance, game theory, industrial engineering, crowd motion, and more. In this paper, we provide a flexible machine learning framework for the numerical solution of potential MFG and MFC models. State-of-the-art numerical methods for solving such problems utilize spatial discretization that leads to a curse of dimensionality. We approximately solve high-dimensional problems by combining Lagrangian and Eulerian viewpoints and leveraging recent advances from machine learning. More precisely, we work with a Lagrangian formulation of the problem and enforce the underlying Hamilton–Jacobi–Bellman (HJB) equation that is derived from the Eulerian formulation. Finally, a tailored neural network parameterization of the MFG/MFC solution helps us avoid any spatial discretization. Our numerical results include the approximate solution of 100-dimensional instances of optimal transport and crowd motion problems on a standard work station and a validation using a Eulerian solver in two dimensions. These results open the door to much-anticipated applications of MFG and MFC models that are beyond reach with existing numerical methods.
Why politicians react to media coverage
Authors: Helfer Luzia , Van Aelst Peter
Published: April 2020

Why do politicians react to some stories in the news and ignore others? We attempt to answer this question by
integrating the micro-level politician perspective with a macro-level country approach. Using a unique experimental approach, we
test when politicians in the Netherlands and Switzerland (N = 80) take political action based on a (fictional)
news report. We find that all politicians react more to negative coverage, but not if the information is merely presented as
investigative reporting. Results also reveal a systematic variation that we ascribe to two key differences in the electoral
systems. In The Netherlands, with its large single voting district, politicians react to news reports covering issues they are
specialized in. In Switzerland, where between-party competition is more important, politicians are more likely to capitalize on
the party’s profile. Overall, this study shows when and how politicians react to news coverage also depends on the institutional
context.
Political actors’ access to the media agenda
Authors: Palau Anna M. , Ansemil Miquel
Published: April 2020

This article explores to what extent the euro crisis brought about unprecedented attention to the European Union (EU) and if so with what consequences on the media visibility of different political actors in Spain. Drawing on a database of more than 27,000 stories published in the most read Spanish newspaper from 2004 to 2012, we demonstrate that following the outbreak of the crisis, executive elites receive more media coverage than social movements, trade unions, and challenger parties critical with EU policies and decisions. The media coverage of EU affairs, however, is not business as usual. Executive elites receive disproportionate media attention but they are no longer presented using the EU following credit-claiming strategies. Our results also indicate that the media are not passive actors that respond to institutional determinants but might be actively involved in the process of giving some actors more visibility in public debates on EU affairs.
Pragmalinguistic challenges for trainee interpreters in achieving accuracy
Authors: Liu Xin
Published: April 2020

In cross-examination, questions are used by counsel as powerful tools to control witness testimonies. In bilingual
courtrooms, conveying the subtlety in the use of questions from one language to another is crucial for all participants. However,
achieving a high level of accuracy is extremely demanding due to the intricacy of courtroom discourse and the complexity of
interpreting in such an institutional setting. Drawing on a moot court exercise at the University of New South Wales, Sydney, this
study investigates the most common pragmalinguistic challenges for trainee interpreters in achieving accuracy when interpreting
cross-examination questions from English to Mandarin. Findings show that it can be challenging to produce pragmatically accurate
renditions: Mandarin interpretations have an overall weakened illocutionary force compared to the original English questions. In
particular, declaratives, reported speech declaratives, modal interrogatives, and tag questions are found to be difficult to
interpret into Mandarin. This paper also explores the way the illocutionary force of the interpreted questions deviates from the
original and the possible causes for this shift. Findings point to the need to enhance pragmatic competence among trainee
interpreters, which in turn will require specialised training for interpreters working in legal settings.
The role of task repetition with direct written corrective feedback in L2 writing complexity, accuracy and
fluency
Authors: Khezrlou Sima
Published: April 2020

This study explored whether the effects of task repetition in drawing learners’ attention to linguistic form could
be reinforced through the provision of two types of unfocused direct written corrective feedback. Fifty-seven learners formed
three conditions: (1) task repetition with no feedback (TR, control), (2) task repetition with error correction (TR+EC), and (3)
task repetition with reformulation (TR+R). All groups repeated an identical writing narrative task but only the experimental
groups received feedback after their initial task performance. All participants were then asked to complete a new task of the same
type followed by a new task of a different type. Performance was gauged by multiple measures of complexity, accuracy and fluency.
Results revealed the persistent superiority of the TR+EC condition on all measures of accuracy while the TR+R condition led to
immediate written complexity improvement regarding subordination. Furthermore, both the TR+R and TR conditions resulted in delayed
fluency gains.
Análisis del vocabulario y la gramática en los documentos curriculares de Hispanoamérica
Authors: Sotomayor Carmen , Coloma Carmen Julia , Osorio Gabriela , Chaf Gabriela
Published: April 2020

El trabajo analiza cómo el enfoque comunicativo se traduce en los documentos curriculares hispanoamericanos.
Específicamente, indaga la vinculación entre la competencia comunicativa (lectura, escritura y oralidad) y la competencia
lingüística (vocabulario y gramática), necesaria para la competencia comunicativa. Los objetivos del estudio son: (i) determinar
en qué habilidades comunicativas se trabajan los contenidos de vocabulario y gramática; (ii) identificar qué contenidos
específicos se abordan en gramática y vocabulario y iii) analizar si tales contenidos se trabajan en relación con textos. Se
analizan los contenidos en los documentos curriculares de 3° y 6° grado de los 14 países participantes de TERCE (UNESCO, 2013). Dichos contenidos fueron categorizados para luego cuantificarlos mediante
análisis de frecuencia. Los resultados mostraron que gramática y vocabulario están vinculados de manera diferente con lectura,
escritura y oralidad en los documentos curriculares, y que el trabajo con textos es una de las características más destacadas del
enfoque comunicativo.
Stance and modals of obligation and necessity in academic writing
Authors: Parkinson Jean
Published: April 2020

Variation has been demonstrated in modal use between written and spoken registers and between disciplines. This article investigates variation within a discipline by comparing modals of obligation and necessity used in three science genres. Obligation modals project strong authoritative stance, thus contrasting with the tendency in academic writing towards tentativeness. The modal auxiliaries must and should and quasi-modals have to and need to are investigated using student writing from the BAWE (British Academic Written English) corpus and a corpus of published research articles. Findings include a dearth of obligation modals in the empirical genres (research articles and laboratory reports). Also a greater prominence was found of dynamic modal meaning (where necessity arises from circumstances) rather than deontic meaning (where the necessity arises from human authority or rules). A further finding is the prominence of objective meaning in the science register compared with the International Corpus of English (Collins 2009a).
Treatment of Municipal Wastewater with Micro-pressure Swirl Reactor
Authors: Wang Xichao , Bian Dejun , Ai Shengshu , Wang Fan , Zheng Shaojie , Zhu Suiyi
Published: April 2020

The experiment used micro-pressure swirl reactor (MPSR) as the object to investigate removal of pollutants and distribution of dissolved oxygen (DO). The results show that the average removal rates of chemical oxygen demand (COD), ammonia nitrogen (NH4
+-N), total phosphorus (TP) and total nitrogen (TN) were 92.4%, 98.6%, 98.0% and 73.8%, respectively. In aeration stage, DO at outlet and central points was obviously different, and the anoxic and aerobic zones were formed naturally. Such as Spirostomum, Macrobiotus and Amphileptus observed during microbiological examination, which indicates a good operating state in MPSR.
Evaluation of Circular Economy Efficiency in Eastern China
Authors: Chen Fan , Yao Weixin
Published: April 2020

Based on the impact of undesired output and the recycling characteristics of circular economy, this paper reconstructed the evaluation index of circular economy efficiency of Chinese provinces and cities, took the data of 10 provinces and cities in eastern China from 2011 to 2017 as the research object, and analyzed the efficiency of circular economy in eastern China by using the data envelopment analysis model. Research results show that: (1) From 2011 to 2017, the average efficiency of circular economy in 10 provinces and cities in eastern China was low, with serious two-level differentiation. From 2011 to 2015, the average efficiency of circular economy in all provinces and cities showed a slow downward trend, slightly recovered in 2016, and slightly declined in 2017.(2)In 2017, the pure technical efficiency of eastern China is high, but the scale efficiency is low. Therefore, Eastern China should first improve the scale efficiency, and then improve the pure technical efficiency. (3) In 2017, Tianjin, Jiangsu, Guangdong and Hainan focused on improving their scale efficiency, while Hebei, Zhejiang, Fujian and Shandong need to improve their pure technical efficiency and scale efficiency at the same time.
Insights of Japan’s Development Strategy of Hydrogen Society on Xinjiang’s Development in Hydrogen Production with Residual Electricity
Authors: Xu Lijun , Xu Lei , Abudureyimu Asifujiang , Shi Ruijing , Abudula Abuliti
Published: April 2020

As China’s important energy base and with its favorable geographical position, Xinjiang is the key region in the development strategy of China’s “Silk Road Economic Belt”. This paper first examines in depth the developmentstrategy and status quo of Japan’s hydrogen society, and then illustrates the current state of Xinjiang’s wind and solar energy development. Combining Xinjiang’s current situation of “wind and solar energy curtailment”, the paper focuses on discussing the necessity of hydrogen production by residual electricity in promoting Xinjiang’s renewable energy market development, and also gives analysis on the prospect and major existing obstacles of Xinjiang’s development in hydrogen production with residual electricity. The research content of this article has positive significance for the healthy development of renewable energy industry in Xinjiang.
Simulation and Research of Non-effectively Grounding Network of Single-phase Ground-fault
Authors: Hou Yunhai , Sun Haoxin , Zhang Shuhan
Published: April 2020

When the non-effectively grounding network of single-phase ground fault happens, the voltage, the current, the zero-sequence voltage and the zero-sequence current have a special change and this problem has been the focus of research attention. Subsequently, it has important effect about the analysis of power system fault characteristics and choice of protection scheme to modeling system of single-phase fault for little grounding current network and to use the zero sequence current amplitude and phase of identifying the fault line and fault phase based on MATLAB software platform in this paper.
Phase Compositions and Mechanical Properties of Chinese Blue-and-white Porcelain
Authors: Shao Gangqin , Zhong Xiaobin , Feng Xinyi , Zhang Yong , Zhu Can , Zhong Zhenchang , Wang Jun , Liu Qi , Li Hongbin , Qiu Zhaobiao , Zhong Youyan
Published: April 2020

Chinese blue-and-white porcelain has engendered a unique appeal and gained a worldwide popularity throughout history, with its unmatched translucency of the body, the shine of the glaze, the permanency of the variegated blue tints, the fineness of decorations and the mysteries behind the manufacturing. Mechanical properties are vital for the manufacturing, transportation and usage of this kind of stunner. In this work, the mechanical properties of Chinese blue-and-white porcelain with Hakka style and Dabu geographical indication were optimized, based on the distinct characteristics of local resources.
Maintenance Decision Method for High Temperature Reactor Equipment Group with Expense Ratio Target
Authors: Zhang Yanpeng , Qing Chen , Gao Jianyong , Geng Jie
Published: April 2020

The equipment group of high-temperature gas-cooled reactors has a wide variety and a large number. Reasonable maintenance planning is especially important. An effective maintenance management strategy can reduce the number of shutdowns and reduce maintenance expense during equipment operation. The goal of maintenance strategy optimization is to improve the reliability of system, prevent system from failures, and reduce maintenance expense influenced by degradation, that is, to maintain or restore products to the appropriate system reliability, availability, and safety performance with the lowest possible maintenance expense.
Research on Power Network Load Forecasting Problem Based on Machine Learning
Authors: Wang Zhankui , Wu Junying , Xin Rui , Bai Tao , Zhao Jianbin , Wei Minglei , Zhuang Lei
Published: April 2020

Based on the existing electric power grid load forecasting method and improving the precision of electric power load forecasting, an power load forecasting model based on Support Vector Machine (SVM) and improve the parameters by Particle Swarm Optimization (PSO). Firstly, analyzed the theoretical basis of support vector machine, and the preliminary prediction model of support vector machine is established. Then, the PSO algorithm is used to iteratively choose the optimal parameters of the support vector machine parameters. Finally, the optimal load prediction model is established by the optimal parameters. The pre-processed real power data is input into the model for learning prediction, and the model prediction effect is verified by Root Mean Square Error (RMSE), Mean Absolute Percentage Error (MAPE) and prediction chart. The experimental results show that the PSO-SVM prediction model can precise forecast the power load and raised the accuracy of power load forecasting. It shows that the PSO algorithm is very effective to adjust the parameters of SVM model.
Design of Heat Sink in Power Electronic Device Using Liquid Metal
Authors: Zhang Peng , Han Ronggang , Wang Dehui , Yan Biao
Published: April 2020

Most converter valves of IGBT modules use a water-cooling system. The cooling technology of water cooling system is mature and has considerable advantages. However, higher power density power electronics lead to greater cooling power. With the improvement of the heat dissipation power of power electronic devices, the traditional water cooling system will gradually fail to meet the heat dissipation requirements of power electronic devices, and new cooling systems need to be developed. In this paper, based on the existing traditional water-cooling system model, numerical simulation analysis technology is used to compare and analyze the different cooling materials (copper, aluminum) and cooling medium (water, liquid metal) under the working conditions. For deionized water and liquid metal, the heat dissipation effect is compared and analyzed, which shows that the heat dissipation performance of the heat dissipation system using copper and liquid metal is greatly improved. Based on this, the model of liquid metal heat dissipation system is proposed. Compared with the traditional cooling model, it shows its superiority in heat dissipation performance with highest temperature decreased by 20.4%.
Research on Abrasion Protection Technology of Hydroturbine Components in Gongzui Hydropower Station
Authors: Qian Bing , Zhang Lei , Ma Yue , Kong Xiangli
Published: April 2020

The volute and fixed guide vane of Gongzui hydropower station have been used for more than 50 years, and the wear and corrosion of them are serious. Polyurethane mortar is a new kind of anti-abrasion material, which has high bonding strength with the base surface. The elastic polyurethane material greatly improves the anti-cavitation performance of the coating, so that the coating can resist sand wear and hydraulic cavitation. The field test of fixed guide vane, seat ring and volute anti-abrasion of No. 1 unit of Gongzui hydropower station was carried out by Yellow River Institute of Hydraulic Research, YRCC, and combined with the characteristics of Dadu river with high sediment content, the material ratio was optimized, and the construction technology was improved, so as to explore the hydroturbine anti-abrasion technology suitable for the characteristics of sediment and abrasion and cavitation damage. After the success of this technology, it can be used as a demonstration for hydropower stations in Dadu river basin to comprehensively improve the anti-abrasion ability of flow parts and the level of safe production and operation.
Energy Saving Analysis of No-load Loss of Electric Welding Equipment
Authors: Li Hailong , Liu Ke , Tan Xiaodong
Published: April 2020

In this paper, two types of electric welding equipment are studied. First of all, YD / k-505fl4 and bx3-500 type welding machines do not have the function of self power off in standby state. It is necessary to install an intelligent welding machine power saving system to control the power off of the primary side of the transformer under the no-load state of the welding machine, and then cut off the no-load loss of the welding machine. Secondly, yd-500-kr II series welding machine has the function of standby, delay and self power off. Due to the unreasonable setting of welding parameters, the uneconomical selection of welding cable and the unreasonable layout of welding machine, the overall energy loss of welding machine is large. Finally, weathering steel is used in the welding process design, and the performance, energy consumption and economic practicability of the material are analyzed.
Research on Standardization of Power Grid Operation Safety Management Based on Set Theory
Authors: Lu Dan , Xu Changqing , Wang Lili , Yu Xiaopeng , Guo Wenya , Zhou Zhipeng , Zhao Chufan , Mi Chuanmin
Published: April 2020

In order to solve the problems in current power grid operation safety management field, the paper firstly distinguishes the concept definitions and forms the uniform standards by discriminating the basic concepts in safety management field. Then, the extension model is formed through standardizing the relationship between different terms by using Wayne diagram based on the set theory. Finally, a set of concept identification algorithm flow is proposed to help the identification of concepts in actual practices. The research shows that, from the perspective of accident causation, the safety management concepts can be divided into two categories. In terms of the causation, the accident potential belongs to the hazard of second kind and third kind which is included into the risk; in the results caused by the causation, the accident precursor includes the near-miss and the accident without intervention which are included into the incident.
Calculation Model of Electric Load Adjustment Capacity of Low Vacuum Heat Supply Unit and its Application
Authors: Guo Junshan , Wang Jin , Wang Ming , Han Yue , Zheng Wei
Published: April 2020

Based on the thermal balance of steam turbine and condenser, the calculation model of electric load adjustment capability of low vacuum heating unit is established by iterative calculation method. Taking a low-vacuum heat supply unit in Shandong as the research object, the electric load adjustment capability is measured. Compared with the test results, the calculation model of this paper has higher precision.
Health Risk Assessment Model Based on Close Degree of Modified Interval Number and Its Application
Authors: Wang Yumin
Published: April 2020

Health risk described relationship between water quality and body health quantitatively. In this paper, health risk assessment model based on close degree of modified interval number was developed aiming to solve the uncertainty problem that parameters in health risk assessment were almost expressed as interval numbers. The model was applied to two surface water sources to assess and compare their health risks. The results indicated that the risks of two water sources were all at level III, and the health risk of water source 2 was higher than water source 1. This model could utilize the uncertain information of parameters sufficiently to acquire reliable and objective results.
Adsorption of Reactive Brilliant Red X-3B from Aqueous Solution by Polypyrrole/Calcium Rectorite Composites: Adsorption Behavior and Mechanism
Authors: Guo Qihua , Xu Yaolei , Yong Kun , Chen Ran , Wang Xiaofeng , Chen Jinyi
Published: April 2020

In this study, polypyrrole/calcium rectorite clay composites (PPy/REC composites) were prepared by in-situ polymerization of pyrrole monomer to adsorb reactive brilliant red X-3B from aqueous solution. The results of XRD showed that the clay flakes exfoliated in the prepared composites. The SEM results showed that PPy had good dispersibility on clay sheets. The adsorption mainly depended on the initial pH value of the solution, and the optimal adsorption of reactive brilliant red X-3B was achieved when the pH value was 2.0. The removal rate of PPy/REC composite was much higher than that of PPy homopolymer. The adsorption kinetic data of reactive brilliant red X-3B at three initial concentrations (100, 150 and 200 mg/L) were best fitted by the pseudo-second-order model, indicating that the concentration gradient of the adsorbent was the driving force of the adsorption process. The adsorption isotherm accorded with the Langmuir isotherm model, and the maximum adsorption capacity was 232.56 mg/g at 298 K. The PPy/REC composites could be regenerated and reused for 5 continuous adsorption-desorption cycles without losing the removal efficiency of the original reactive brilliant red X-3B. XPS, zeta potential and FT-IR results showed that the removal mechanism of reactive brilliant red X-3B was related to electrostatic interaction and ion exchange.
Study on Preparation and Absorption of Alizarin Red from Mg/Al Layered Double Hydroxides
Authors: Zhao Wei , Chen Youning , Li Yuhong , Hu Jiangshan , Deng Yuling
Published: April 2020

Mg/Al-LDH was prepared by co precipitation method at pH 10.5, 85 and hot water °C for 6 hours with controlling Mg/Al ratio (2:1 and 3:1) and mixing (at common stirring and ultrasonic stirring). The samples were characterized by the Fourier transform infrared spectro scopy and X-ray diffractometer analysis. Finally, the four group structure and excellent quality of hydrotalcite materials were obtained. Samples were calcined at 500 for 4h, and then °C the effects of different influencing factors on the adsorption of alizarin red by the adsorbent were studied. The results show that the prepared materials are layered with hydrotalcite and have good adsorption performance. When the pH value is 10, adding 1g of hydrotalcite and performing adsorption at low temperature, the adsorption rate reaches a maximum of 99%.
Investigation of Preparation of Biochar-based Sustained release Fertilizer from Filter Mud of Sugar Mills and Its Properties
Authors: Xiang Min , Liu Faqiu , Zhou Shaoji , Tang Qiuping , Li Kai
Published: April 2020

In order to make better use of the filter mud from sugar mills, biochar was prepared by pyrolysis of the mud at 500, which was then to absorb urea to produce sustained release °C fertilizer pellet, using soluble starch as the binder. The pellet shaping, the mechanical properties and the sustained-release effect of the pellet fertilizer were studied. The results showed that 22-26% water content was favorable for pelleting the biochar-based fertilizer, improving the maximum crushing compression force (MCCF) of the pellet. The pelleting rate and its MCCF decreased with the increase of biochar content. The sustained release effect of the pellet fertilizer was better than that of traditional fertilizer, and the sustained release effect increased with the increase of biochar content and soluble starch content. The optimum conditions in terms of pelleting rate, MCCF, sustained release performance and cost-effectiveness were the ratio of urea to biochar of 1:5, the content of soluble starch 10% and the amount of water 24%. The release of the biochar-based fertilizer was in accordance with the first-order release model.
Influence of Milling Time on Productivity of Boron Nitride Nanotubes Synthesized from B2O3 by Ball Milling and Annealing Method
Authors: Li Yanjiao , Liu Bin , Qin Zhongbao , Hou Li’an
Published: April 2020

Ball milling and annealing method is an important method for synthesis of boron nitride nanotube. How to improve their productivity through this method is a problem that people have been studying all the time. In this paper, the influence of milling time on productivity of boron nitride nanotubes synthesized from B2O3 through ball milling and annealing method was investigated. The result indicated that the optimal milling time for synthesis of BN nanotubes with high productivity is 80h. The reason for formation of these high productivity BN nanotubes can be ascribed to the high chemical reactivity and appropriate amount of catalyst in B2O3 powder milled for 80h. The results of this study can provide guidance for the preparation of high yield BN nanotubes.
Determination of Selected Organophosphorus Insecticides and Their Oxides in Tea and Soil by HPTLC
Authors: Zhang Rong , Leyi Chen , Fan Yu , Zhang Jian
Published: April 2020

A determination method of selected organophosphorus insecticides and their oxides (Parathion- methyl and Dimethyl- paraoxon; Parathion and Paraoxon; Chlorpyrifos and Chlorpyrifos-oxon.) in tea and soil was developed with high performance thin-layer chromatography (HPTLC). The acetonitrile was applied to extract tea sample and the tandem column of solid-phase extraction was to clean samples up. The soil sample was extracted with ethyl acetate and not to be clean-up. The processed samples were directly applied as bands to glass-backed silica gel 60F254 HPTLC plates. The plates were developed by AMD with 7-step for tea samples and 2-step for soil samples. Evaluation of the developed HPTLC plates was performed densitometrically. Three fortification levels of the samples were conducted in the test. In this method, the detection limits of parathion-methyl, dimethyl-paraoxon, parathion, paraoxon and chlorpyrifos-oxon were from 3.0×10–9 g to 1.0×10–8 g in different development systems. The chlorpyrifos was from 7.0×10–9 g to 2.0×10–8 g. Recoveries of the pesticides residues from tea were 68.98-116.73%, and the soil were 69.44 –120.00 % except the chlorpyrifos. The relative standard deviations were 4.02–17.50 % for tea, and 3.11–14.20 % for soil except the chlorpyrifos. The Rf value and the validation data were given. The development by AMD in this method was discussed.
Application Research on the Fiber Bragg Grating Sensing Technology in Arch Dam Model Test
Authors: Wang Senhao , Chen Yuan , Sun Tao , Yang Baoquan
Published: April 2020

Fiber Bragg Grating (FBG) has the advantages of high sensitivity, high resolution, low cost and small volume. Therefore, FBG sensing technology is widely used in the monitoring of structural engineering. In this research, FBG sensing technology was applied in the geo-mechanical model test of arch dam for the first time. The geomechanical model of Lizhou arch dam was built, and the FBG sensors were arranged on the upstream dam surface, while the resistance strain gauges were arranged on the downstream dam surface. The model failure test was carried out to get the stress-strain state and its changing process of the dam body. The test results show that the monitoring results of the FBG sensors and the resistance strain gauges are basically consistent, and it is found that the initial cracking overloading safety coefficient is K
1 = 1.4 ∼ 2.2, the nonlinear deformation overloading safety coefficient is K
2 = 3.4 ∼ 4.3, the ultimate overloading safety coefficient is K
3 = 6.0 ∼ 6.6. The application of FBG technology provides a method to solve the problem that the strain of the upstream surface of the arch dam model cannot be directly monitored due to the insufficient space caused by the installation and loading system, and also provides a new idea for the measurement technology in the geo-mechanical model test.
Research on the Electric Lifting of the Corner Transmission Tower
Authors: Chen Zhenjia , Chen Kongliang
Published: April 2020

By establishing the finite element model, the reliability of the corner transmission tower is analyzed before and after jacking. The calculation conditions are divided into four types: self-weight working condition before jacking of electric tower, wind load working condition before jacking, self-weight working condition after jacking, and wind load working condition after jacking. The results have been compared and analyzed by analyzing and calculating model and internal force of each working condition. The results show that there is not much deviation between the unit stress and the internal force bending moment of the key parts, which meets the normal use requirements. Under the wind load conditions of the transmission tower, the stress of the tower tower increases, but it is not obvious, which shows that the charging jacking technology of the corner transmission tower is safe and reliable.
Experimental Study on Determining Elastic Modulus of Integrated Bamboo with Deflection Method
Authors: Wei Liuchuang , Wei Ping
Published: April 2020

This paper mainly studies the experimental method of elastic modulus measurement of integrated bamboo. In this paper, experiments were carried out using rectangular section rods made of integrated bamboo. During the test, the rod was fixed at one end and the other end was cantilevered. A concentrated load is applied to the cantilever end of the rod to measure the projection of the rod end laser pointer on the projection plate. According to the calculation relationship between the projection displacement, the load and the elastic modulus, the elastic modulus of the integrated bamboo is measured.
Identification of SSI Damping System Based on Large-Scale Shaking Table Test
Authors: Zhiying Zhang , Yihe Yin , Xin Tian , Lizheng Song
Published: April 2020

Damping system represents the pattern and characteristics of energy dissipation in a dynamical system. The correct identification of a damping system is not only the premise of selecting dynamical analysis method but also the foundation of obtaining accurate results in seismic analysis. Traditionally, the identification of a damping system under seismic waves is based on material properties. However, this method is the lack of theoretical and experimental research. Based on the most fundamental identification method, the paper presents the study on the consistency of dynamic characteristics between different parts and continuity of motion states at the interfaces of the SSI (Soil-Structure Interaction) system by shaking table test. The changing law of SSI damping system in different dynamic processes is investigated. The experimental results indicate that the SSI system manifests obviously classical energy dissipation characteristics under certain conditions and can be considered as an approximate classical damping system.
Research of Toppling Criterion and Analysis of Instability Evolution of Toppling Deformation Slope
Authors: Zhou Heng , Huang Peng , Di Shengjie , Wang Mingjiang
Published: April 2020

Toppling failure is one of the main types of rock slope instability. Based on the Goodman-Bray toppling stability analysis model, the starting mechanism and criteria for toppling deformation are deduced. Combined with the discrete element numerical simulation method, the evolution failure mode of the toppling slope is studied, which can better reflect the basic regularity of the toppling failure, and provide support for slope engineering. In order to predict the influence of the foot displacement of the leading edge on the slope surface displacement, several monitoring points are set at the boundary of the slope and the bend of the toppling body. It is of great engineering significance and practical value to make safety early warning in time.
Inspection scheme and disposal measures for abnormal vibration and noise of EMU
Authors: Guoping PENG , Li HUANG
Published: April 2020

There are different forms of abnormal vibration and abnormal noise of the EMU, involving many types of components, and many components cannot be judged through visual inspection, and some components cannot even be visually inspected. This article analyzes the characteristics of different types of vibration or abnormal sounds, and provides suggestions for troubleshooting and treating measures to guide subsequent similar failures.
Study on line Vibration Characteristics of Equipment for Electric Multiple Units
Authors: Wang Chengqiang , Shi Huailong , Qi Yayun
Published: April 2020

The rigid-flexible vibration of high-speed train will cause the violent movement of equipment. This paper first introduced the high-speed EMU equipment and the theory of mass tuning vibration absorption. Then according to the test data, the vibration response of the bogie frame and the vibration response of the equipment, and the vibration response of the equipment under different lines are analyzed. The results show that the lateral vibration frequency of the frame is 4.5 Hz in normal section, and the lateral vibration frequency of the frame is 7.4 Hz in hunting excitation section. During the normal vibration line, the vibration of the equipment is significantly larger than that of the carbody, the vibration characteristics of the frequency domain of the equipment is mainly high-frequency magnetic vibration, the high-frequency vibration of the equipment above 15Hz is not transmitted to the carbody. When the running speed is increased, the vibration of the equipment is enhanced, and the line condition also has an important influence on the vibration of the equipment.
A Review of True Orthophoto Rectification Algorithms
Authors: Li Tingting , Jiang Chunshan , Bian Zhenqi , Wang Mingchang , Niu Xuefeng
Published: April 2020

Orthophoto is one of the most important basic geographic information products. Because traditional orthophotos use incomplete surface information for digital differential rectification, there is mutual occlusion between images, which is difficult to meet the current large-scale urban mapping requirements. With the rapid development of photogrammetry technology and the increasing demand for high-precision graphics, the true orthophoto has become a major research hotspot at home and abroad. This paper expounds the development of the true orthophoto rectification, summarizes the relevant algorithms for the true orthophoto production, and points out the core problems and future development of the true orthophoto production. Through the summary and analysis of the image rectification algorithm, the image occlusion detection, shadow compensation and other issues are proposed. The morphological filtering algorithm is used to identify buildings in densely populated areas, and the PCNN model method enhances texture features, and combing the deep learning for shadow compensation, in order to optimize the actual image rectification algorithm for existing images.
Flaw detection in concrete media using XFEM and an improved artificial fish swarm algorithm
Authors: Zhao Wenhu , Du Chengbin , Li Xinzhu
Published: April 2020

A novel strategy is proposed in this paper for identifying and characterizing the irregular flaws in heterogeneous media. The optimization iterations are implemented by using the improved AFS algorithm and the corresponding forward analyses are solved by XFEM. A series of candidate sub-defects are employed to describe each flaw jointly. Each candidate is devised as a square void with the boundaries matched the XFEM meshes to avoid subdividing the enriched elements. The K-means cluster algorithm is utilized to narrow the searching space and output the number of flaws. A typical numerical example is conducted to demonstrate the proposed strategy. The result indicates that this strategy can identify the irregular flaw and it is potential to be applied in the evaluation of the civil and hydraulic structures.
Measurement management of electronic instruments
Authors: Luan Yuanling , Zhang Shisong , Zhang Jianfei
Published: April 2020

With the continuous development of science and technology, electronic instruments and meters measuring equipment in accuracy, accuracy and sensitivity has been rapid development, and widely used in scientific research and production in China. As a measuring tool, instrument measurement can detect, analyse and manage products, effectively improve product quality in product production supervision and inspection, effectively reduce resource waste, and protect the legitimate rights and interests of users. Although the accuracy of electronic instruments is required more and more, due to poor management, there are often various problems in the use process. In this paper, combined with the extensive needs of electronic instruments in the new situation, the current development status of electronic instruments in China is analysed, and relevant improvement measures are put forward for the problems, aiming to strengthen the measurement management of electronic instruments and ensure the smooth progress of scientific research and production.
Cinite Element Analysis of Hydraulic Slope Stability Based on Strength Reduction Method
Authors: Wei Ping , Wei Liuchuang
Published: April 2020

Slope stability analysis is a hot research topic in geotechnical engineering. According to the actual engineering hydraulic slope stress, based on the strength reduction method theory, the finite element software ANSYS is used to analyze the stability of a hydraulic slope engineering, and the effective safety factor of the slope is obtained, which is safe for other slopes. Support design provides a reference.
Application Research of BIM Technology in Highway Reconstruction and Extension Project
Authors: peng Dong , chao-ming Chi , xin Yan , ming-fa Wang , run-zhi Zhang
Published: April 2020

Relying on its own technological advantages of data integration, information sharing, management cooperation and visualization, BIM technology is gradually applied to highway reconstruction and extension project construction. The applications include 4D simulation technology of construction organization scheme, traffic organization simulation technology, digital interactive virtual sand table technology and project collaborative management platform will be helpful to break through the bottleneck of highway traditional construction management and realize the leap-forward promotion of informationization and fine management level of highway reconstruction and expansion project construction.
Research on the stability of steel cylinder structure during uninstallation
Authors: Liu Wenbin
Published: April 2020

Steel cylinder makes great contribution in forming a fast quay wall of man-made island. In practice, the installed steel cylinder will be cut or uninstalled to meet the need of construction. This paper analyzed the stability of steel cylinder during uninstallation stage with finite element method. An engineering case was used to demonstrate the analysis procedure.
Analysis of new temporary cofferdam stability
Authors: Liu Wenbin
Published: April 2020

As a temporary cofferdam, the wave force is the biggest threaten to the structure stability. This paper analysed the stability of plug-in steel cylinder under the action of wave. The stability analysis was proposed based on an engineering case and made contribution to the guiding of actual construction.
Parking Area Data Collection and Scenario Extraction for the Purpose of Automatic Parking ADAS Function
Authors: Wang Lei , Yu Bo , Chen Chao
Published: April 2020

Automatic Parking is the most significant ADAS function that could achieving mass production in the field of unmanned driving. For the purpose of automatic parking function, we’re foundamentally facing the corresponding data collection and data analysis.In view of three classical parking scenarios,this paper is concentrating on three contents including the sensor hardware construction, the perception algorithm development,and scenario data analysis.For the the hardware construction,we focus on the sensor installation,time calibration,and space unification.Based on the front camera and RADAR data fusion,we put great emphasis on the multi-target matching and fusion algorithm. And for the purpose of the scenario extraction and big data analysis work, we are developing automatic big data processing Python code,realizing TB level original data labeled, and data completely processed in short time.The whole technology process and tool chain in this program,have extensively high level scientific research and commercial value
Numerical Analysis of Steel Cylinder Anchorage Deformation for Suspension Bridge
Authors: Xu Binbin
Published: April 2020

In this paper, the deformation of the new structure under the tension of the suspension bridge is calculated and analysed in detail using the finite element software. The maximum horizontal displacement is about 6.65cm, which is located at the top of the anchor structure. The downward vertical deformation occurs at the side of the anchorage structure, with the maximum value of about 2.7cm. The upward vertical deformation occurs at the rear of the bearing surface, with the maximum value of about 3.0cm. The deformation of the anchorage in this scheme satisfies the specification requirements.
Probability distribution and influence factors on corrosion initiation of reinforcing steel induced by chloride
Authors: Yu Faqiang , Liu Wenchao , Gao Weiwei
Published: April 2020

Chloride-induced corrosion of steel in reinforced concrete structures is one of the major causes of their deterioration over time. Chlorides from de-icing salts or marine breeze penetrate through the concrete cover and break down the natural protective oxide layer formed around the reinforcements by the strong alkalinity of pore solution. As a matter of fact, the free chloride in concrete could not transport through reinforcing steel and accumulated at front point of reinforcing steel rapidly which made reinforcement corrosion initiation earlier. Therefore, the current studies on corrosion initiation might be hazardous without considering the obstruction action of reinforcing steel. In this paper, the Fick’s second law was used to describe the free chloride concentration evolution in concrete and obstruction action of reinforcing steel was considered. The influences of the variability on boundary chloride concentration, thickness of concrete cover, and chloride diffusion coefficient on cumulative distribution of corrosion initiation of reinforcing steel were studied thoroughly. The obstruction of reinforcing steel gave much influence on corrosion initiation, especially for thinner concrete cover, higher concrete strength, and higher environmental temperature.
Application of Ant Colony Algorithm in Selecting Shortest Engineering Path
Authors: Tian Jinsong , Chen Manyu , Chen Chao , Liu Xin
Published: April 2020

In engineering surveying, topographic maps can be used to find the shortest path. Traditional methods identify the smallest radius based on the design slope before finding the shortest path. This paper, by using the ant colony algorithm and MATLAB software, manages to select the shortest path in engineering practice, and compares the result with that obtained using the genetic algorithm. The results show that the ant colony algorithm can be applied in selecting the shortest path in engineering projects and it can deliver a stable and optimal result after 240 times of iteration. However, the genetic algorithm cannot achieve that even after 400 times of iteration. Therefore, the ant colony algorithm is superior to the genetic algorithm in the aspect of the calculation speed, the stability of achieving the optimal solution, and selection of the shortest path.
A Method of the Voronoi Seabed Sedimentary Domain Boundary Reconstruction
Authors: Zhang Jin , Li ShuJun , Wang Mo
Published: April 2020

Seabed sediment point data is the data basis for expressing the sediment elements. The determination of the extent of the seabed sediment type is the data base of the geometric model and the seabed sediment thematic chart. For the existing point element selection method cannot meet the application requirements. This paper uses the weighted idea to different data density and complex marine environment. Taking into account the trend of the sediment size and charting compensation effect, the influence weight of the point-like bottom data is analyzed, and the range of influence is reasonably determined. It provides a certain reference for the production of seabed sediment thematic chart and has high use value and broad application prospects.
Correlation between PM concentrations and meteorological conditions in Chengdu based on in-situ observations
Authors: Haoran Jia
Published: April 2020

Atmospheric aerosol particle plays a vital role in the Earth’s radiation budget, affecting human health by raising air pollution events, which have become remarkably common in megacities of China. Three sites in Chengdu city were selected for measurement of air quality index(AQI) and pollutants like PM2.5, PM10, SO2, NO2, whose concentrations were indicators of air quality. The association between air pollution in terms of AQI (pollutants’ concentrations) and meteorological conditions like Relative Humidity(RH) and Wind Velocity(WV) have been evaluated in this study. The results show that AQI peaked on June 22ndand Jul 16th, when PM2.5and PM10dominated. Further analysis reveals that only PM2.5and PM10are related to RH. In particular, PM2.5(PM10) intends to decrease when RH increases with a coefficient of -0.4(-0.57). However, there is no evident co-variation between RH and SO2(NO2). The results also indicate that concentration of NO2decreases when WV increases with a coefficient of -0.66. By contrast, corresponding relationship between PM2.5(PM10) and WV is less evident.