bluuebunny/crossref_metadata_2025 huggingface dataset:
Development and Research Status of Road Cleaning Vehicle
Authors: Xu Heqing , Xiao Jixue , Feng Yu
Published: November 2020

Road cleaning vehicle is efficient cleaning equipment. It integrates road cleaning, garbage recycling and removing. This paper introduces the research background of road cleaning vehicles briefly. Then it summarizes the representative products of road cleaning vehicles, and analyzes the current status of technology development. At present, the multifunctional cleaning car on the market has the functions of suction and sweeping combination, no need to spray water, dust suppression, full filtration, purification and emission. Some companies even integrate advanced technologies such as automatic driving and intelligent identification. Finally, it predicts that the road cleaning vehicle will be developed in intelligence and environmental protection.
Research on the Innovation of Additive Manufacturing Technology in Contemporary Industry Development
Authors: Ma Xueliang
Published: November 2020

Additive manufacturing technology has entered our daily life, seemingly omnipotent. At the same time, a considerable proportion of scholars believe that this technology can not replace the traditional manufacturing industry. How to promote the development of additive manufacturing technology and make it meet the market demand quickly is the purpose of this study. This paper analyzes the problems of additive manufacturing technology from the aspects of “technology readiness index”, “driving force and bottleneck”, “innovation demand” and “obstacles to commercial promotion”, and puts forward solutions.
Three Forms of Minimum Flow Pore Throat Radius of Reservoir and Its Determination Method
Authors: Dai Jinyou , Lin Lixin
Published: November 2020

The minimum flow pore throat radius of the reservoir is an important indicator to characterize the seepage capacity of the reservoir pore throat. At present, the type of minimum flow pore radius is single, and there are few quantitative methods to determine it. To this end, through the analysis of the seepage capacity at different scale pores and the experimental method of mercury intrusion, the minimum flow pore throat radius and the determination method of the reservoir under the three seepage states of theoretical seepage, production seepage and filling seepage were studied and an example is applied. The analysis shows that the theoretical minimum flow pore throat radius corresponds to the lower limit of the capillary pore radius, and its size is related to the reservoir pore structure, which can be directly determined according to the mercury intrusion curve. The production minimum flow pore throat radius is the lower limit of the flowing pore radius of the reservoir. Its size is related to the reservoir pore structure and the production pressure difference. It can be determined by combining the mercury intrusion curve and the production pressure difference. The filling minimum flow pore throat radius is the lower limit of the filling pore radius. Its size is related to both the pore structure and the filling dynamics. It can be determined by combining the mercury intrusion curve and the original oil saturation. The above method was used to determine the minimum flow pore throat radius of Chang 63 reservoir in X Oilfield, Ordos Basin: the theoretical minimum flow pore throat radius is 0.015 μm, the production minimum flow pore throat radius is 0.017 μm, and the filling minimum flow pore throat radius is 0.085 μm. This study deepened the understanding of the minimum flow pore throat radius of the reservoir, and clarified the determination method of the minimum flow pore throat radius under different seepage states, which has reference significance for the calibration of the lower limit of the reservoir physical properties and the study of the reservoir utilization status.
Research on Civil Aircraft Structural Strength Material Performance Database Based on SpringBoot
Authors: He Minmin , Lv Shengli
Published: November 2020

According to various materials used in civil aircraft structural strength analysis, and applying software engineering ideas and object-oriented programming methods, a set of civil aircraft structural strength material performance database system based on SpringBoot was developed. The scope of the material library management and the input data standards are initially defined, through the analysis of civil aircraft material data, the metal, composite materials and layup data are classified and managed respectively. The material library used for finite element calculation and strength inspection also provides the export function of Nastran material card, it has a certain reference value for highly-managed civil aircraft depots, and can achieve work collaboration and improve work efficiency.
Effects of Hydrogen Diffusion on the Mechanical Properties of 2.25Cr1Mo0.25V Steel
Authors: Ge Jiahao , Yin Changdong , Wu Yiwen , Chen Jianjun
Published: November 2020

With the rapid development of hydrogen related equipment, how to ensure the reliable operation of these equipment has been an important research topic. 2.25Cr1Mo0.25V steel has high strength, good resistance to hydrogen corrosion and low cost. So it becomes one of most used material for high temperature and high pressure hydrogen systems. In this paper, the glycerine gas gathering experiment, micro hardness test and dynamic tensile experiment were conducted to study the changes of the mechanical properties of 2.25Cr1Mo0.25V steel under varying hydrogen charging time. The relationship between the hydrogen content and material properties were also discussed in detail.
3D Finite Element Analysis on Mechanical Behavior of Completion Tubing String for Extra-Deep High Temperature Gas Well
Authors: Liu Shuang , Shen Xinpu , Liu Junyan , Shen Guoxiao , Xu Qiang , You Dongdong
Published: November 2020

3D Finite Element model was built for analysis of mechanical behavior of tubular system. Factors of wellbore trajectory deviation and frictional contact behavior between tube and casing are considered in the model. Loads of packer setting, hydraulic fracturing, and gas production are included. Numerical solutions of stress and displacement distribution along the tubing are presented. Principal results are: 1) Displacement distribution along the whole length of tubing. 2) Distribution of axial stress and von Mises stress along the whole length of tubing. 3) Distribution of displacement and stress along the tubing section below expansion pipe, as well as frictional contact stress and frictional force in this section.
Effect of Fly Ash Content on Mechanical Properties of C80 High-Strength Concrete
Authors: Wu Yanli , Yin Suhua , Yang Wu , Dong Zhongqi
Published: November 2020

The changes of compressive strength and elastic modulus of concrete specimens with water-to-water ratio of 0.25, different content of fly ash (0%,20%,40%) and different ages (7d, 14d, 28d, 56d, 90d, and 120d) were studied. The results show that the amount of fly ash has a great influence on the compressive strength and the elastic modulus of the high-strength concrete.The compressive strength and elastic modulus of concrete with 0%, 20%and 40%content increase with age, but the compressive strength and elastic modulus decrease with the same age.
Effect of Cr on the Characteristic of Rust Layer Formed on Low Alloy Steels Immersed in Flowing 3.5%NaCl Solution
Authors: Yang Jianwei , Jiang Shan , Xu Feifan
Published: November 2020

The role of Cr concentrated inrust layer formed on Cr-containing steels was investigated. Corrosion products formed on these steels were analyzed by usingXPS, XRD,TEM, and Raman spectroscopy. The result indicates that amorphous Cr(OH)3 and (FeCr)3O4 formed on the Cr-containing steelsresulted in the formation of ultrafine corrosion-product particles and, consequently, a compact rust layer with low electronic conductivity. The Cr-containing rust layer servedmainly to inhibit the cathodic reaction of O2reduction, therebyimproving the flow-accelerated corrosionresistance of the low alloy steel.
Influence of Mixed Admixtures on Properties of Aeolian-sand Mortar
Authors: Guo Junhua , Yin Jiangtao , Yang Yi , Gao Chunyong
Published: November 2020

Using Aeolian sand as fine aggregate, adopt fixed lime sand ratio(1:2, Under the same consistency of mortar, the effect of single and compound doping of VAE and Water retaining agent(BS-W) on the working and physical properties of mortar was studied. Through the coMparison of its properties with blank mortar, to get the best content of admixture and the best proportion of compound admixture, to provide ideas for the development and research of high proportion or total replacement of aeolian sand mortar. The results show that: VAE and water retaining agent can obviously improve the workability, construction and water retaining performance of the slurry, but the physical and mechanical properties of mortar are reduced. When VAE content is 0.7%, BS-W content is 0.15%, the overall performance of mortar mixed with them is better, the flexural strength and compressive strength of mortar reached 4.78Mpa and 15.3Mpa respectively in 28d.
Synthesis of a New Flame Retardant Curing Agent with Phosphorus and Their Application to Epoxy Resins
Authors: Zhang Hongkun , Li Zan , Gong Xianyun , Wang Yang
Published: November 2020

The synthesis has been made on a new kind of phosphorus-containing compound 2-(phenylphosphoryl)-1,4-benzenediol, which is defined as PPBDO. Besides, it is utilized as a flame retardant and meanwhile a curing agent of epoxy resins (EP). The description of the chemical structure was made in virtue of Fourier transform infrared (FTIR) spectroscopy, 1H, together with 13C nuclear magnetic resonance. Investigation on the flame retardant properties, cured epoxy resins’ combusting performances, and thermal degradation behaviors in virtue of restricting oxygen index (LOI) and vertical burning tests (UL-94) as well as cone calorimeter and thermogravimetric analysis (TGA) experiments. According to the results from the cone tests, the PPBDO integration could efficiently decreased the combustion parameters featured by epoxy resins thermosets, including Heat release rate (HRR), Total heat release (THR), etc.. The TGA results displayed the PPBDO introduction managed to enhance epoxy resins matrix under the decomposition in advance, in comparison to the one pure EP, thus giving rise to a more concentration of char yield as well as thermal stability on the condition of high temperature.
Noise Reduction of Pipes under Sound Excitation via Various Attached Composite Structures
Authors: Song Yubao , Tang Daofeng , Zhang Hao , Guan Haoyi , Yang Benchuan
Published: November 2020

Pipe systems are broadly used in modern buildings and large transportation vehicles. The reduction of noise from pipes is one of the main concerns in their engineering applications. In this paper, the reduction of the radiated noise from pipes is studied experimentally using various attached structures. An experimental system is constructed in an anechoic room. Three types of attached structures are considered, including foam coatings, distributed absorbers and periodic absorbers. Via the comparison of basic pipe and pipes with different noise control designs, the reduction effects from the attached structures are compared and analysed. The results show that the radiated noise is effectively reduced by the foam coatings and distributed absorbers, especially, at most of the peaks of the noise. The distributed absorbers reduce the noise more on the whole. The low frequency peaks (below 200Hz) of the noise are reduced most by the periodic absorbers. Via the proper design of the structure types and corresponding parameters, the low frequency property, the broadband property and the reduction amplitude will be obviously enhanced.
The Effect of 4,4′-Methylene-bis-(2,6-di-tert-butylphenol) on Properties of Polyvinyl Alcohol/Chlorinated Polyethylene Composites
Authors: Jiang Sheng
Published: November 2020

A series of damping composites were prepared by adding 4,4′-Methylene-bis-(2,6-di-tert-butylphenol) (AO 4426) to a mixture of chlorinated polyethylene (CPE) and polyvinyl alcohol (PVA) with a mass ratio of 80:20. The damping properties and molecular structure of the composites were measured, characterized and analyzed by means of DMTA, DSC and FT-IR. The results show that there is only one damping peak in the PVA/CPE composite. However, a new damping peak appeared above the glass transition temperature of CPE with the addition of AO 4426 because of phase separation which caused by the aggregation of AO 4426 microcrystal under the action of hydroxyl hydrogen bonds. The corresponding temperature of this new damping peak is determined by glass transition temperature of AO 4426. Fourier infrared spectrum show aromatic ether and aromatic ester formed by dehydration between PVA and AO 4426.
Experimental Study on High Speed Two-dimensional Airfoil Based on Conventional High Speed Wind Tunnel Test
Authors: Wang Yi , Zhou Tao
Published: November 2020

The wind tunnel test of two-dimensional airfoil is usually carried out in the special wind tunnel for the airfoil test, but this kind of wind tunnel is usually small in size and low in Reynolds number. On the contrary, the conventional wind tunnel test is generally large in size, in which higher test Reynolds number can be obtained, but there is wall interference and other problems to overcome at the same time. In this study, the RAE2822 airfoil was used to carry out the wind tunnel test of high-speed two-dimensional airfoil in FL-3, which is a large-scale conventional high-speed wind tunnel and the section pressure coefficient was measured. Experimental data after calculation and correction comparing with the standard model data shows that it is practically possible to carry out airfoil wind tunnel test in conventional high-speed wind tunnel.
Augmented Reality in Maintenance Training for Military Equipment
Authors: Wang Wei , Lei Songgui , Liu Haiping , Li Taojin , Qu Jue , Qiu Ang
Published: November 2020

After more than 20 years of development, augmented reality technology has shown a strong development momentum, successfully applied in civil and military fields. And augmented reality maintenance system is one of the most typical application. This paper introduces the present situation of augmented reality maintenance system, illustrates the structure of a typical system, discuss key technologies of augmented reality maintenance, and investigates the insufficiencies of it in military equipment maintenance according to the contemporary condition. Eventually, this paper indicates the potential development tendency of the augmented reality military equipment maintenance system in the future.
Analysis of Spray Uniformity of Sprayers Based on Deep Belief Network
Authors: Li Shujiang , Guo Aijing , Li Maoyuan
Published: November 2020

Improving spray quality has a important practical significance for controlling the drift of harmful substances, increasing the effective utilization rate of pesticides and reducing environmental pollution. The influence of factors on spray quality is analyzed, and the nozzle wear is regarded as one of the influencing factors for the first time in this paper. It also constructs the relationship between spray distribution uniformity and influencing factors Model by proposes a soft measurement method based on deep belief network. Besides, when the distribution coefficient of variation and another influencing factors is given, the pressure value corresponding to them can get by neural network inverse modeling method, And the pressure can be used as the controlled variable in the spraying process. Compared to BP, the DBN model has stronger nonlinear mapping capabilities, higher prediction accuracy, and high practical value.
Research on High-rise Building Energy Saving Based on Data Fusion Model
Authors: Zhenwei Chen , Zijing Yang
Published: November 2020

With the economic development, high-rise building projects are popularized in more real estate development. The different electricity types of high-rise buildings are separately predicted in the paper to better discover the laws of each electricity type, which is more accurate than using only the total power consumption to make predictions, so that the algorithm will have stronger nonlinear fitting ability. Moreover, by using optimized particle swarm optimization algorithm to solve the fusion model parameters among multiple types of data, the parameters of the WLSSVM model are optimized to find the optimal combination of parameters, which effectively improves the prediction accuracy of the model and contributes to the energy saving and emission reduction of high-rise buildings.
Landscape evaluation of urban parks based on SBE and AHP: a case study of Kunming City
Authors: Shi Ying , Lv Dongpeng , He Jiang
Published: November 2020

The evaluation criteria of traditional urban park landscape evaluation methods are mostly flood control effect and commercial demand, and the index evaluation is not comprehensive. Therefore, taking Kunming as an example, this paper introduces SBE method and AHP method to evaluate urban park landscape. This paper analyzes the evaluation methods of urban landscape and urban park landscape at home and abroad, and selects infrastructure, landscape aesthetic degree, natural ecology and social culture as evaluation indexes of urban park landscape. The park landscape evaluation system of Kunming city was established, the plant landscape evaluation index was set up, and the landscape characteristics of urban park were classified. The comprehensive judgment matrix of urban park landscape evaluation is constructed to complete the comprehensive evaluation of urban park landscape. The results show that this method can evaluate the park landscape of Kunming in all aspects, and the accuracy and rationality of the evaluation are significantly improved in the actual application process.
Analysis of internal force and displacement of foundation pit pile anchor supporting structure based on soil frost heaving
Authors: Shi Dongmei , Li Yuanxun , Gao Xinya , Li Shuanghao , Xiang Tian
Published: November 2020

In order to study the influence of soil frost heaving on the internal force and displacement of foundation pit supporting structure in seasonal frozen soil area in Northwest China, the field test of pile anchor supporting structure for deep foundation pit is carried out to monitor the change of internal force and displacement of supporting pile in winter. The interaction relationship between soil frost heaving and internal force and displacement of supporting pile is analyzed combined with temperature change conditions. The results show that: Under the condition of natural frost heaving in winter, the frost heaving effect is the most significant at 0.5 m of the upper part of the supporting pile, and the reinforcement stress value on both sides of the pile body is the largest. The change rate of bending moment of supporting pile above 3.25m is higher than that of the embedded section and the maximum bending moment is at 0.5m, while the blot has a certain constraint on the bending moment deformation. The displacement of supporting pile increases in proportion to the freezing time, and the final increase is 157.7% of the initial value. It can be seen that soil frost heaving has great influence on the internal force and deformation of the upper structure of the retaining pile. The research results can provide reference for the construction of foundation pit support engineering in similar areas in winter.
Design Method and Finite Element Analysis of Prefabricated Steel-concrete Composite Lattice Column
Authors: Fu Xiaofan , Peng Xiaotong , Zhang Xu , Lin Chen
Published: November 2020

In order to solve the problem of exposed column, a new prefabricated steel-concrete composite lattice column (SCLC) in residential building was proposed. The SCLC consists of concrete filled steel tubes, which are connected by channel steel and lace plates. The finite element simulations of six infilled SCLC with different cross-section (L-shaped, T-shaped and X-shaped) were performed under monotonic loading by using ABAQUS, in which the carrying capacity, ductility, stiffness and energy dissipation were analysed. The results indicate that the infilled concrete can improve the strength and stiffness of SCLC, while the ductility decreases slightly. X-shaped SCLC has the best carrying capacity and poor ductility. The SCLC with T-shaped has the best comprehensive performance.
Study of experiment in field for long-span cable-stayed bridge
Authors: Guo Kun , Liang Junwei , Pu Guangning , Han Xin
Published: November 2020

In order to provide the reasonable optimization measures for the construction of long-span steel bridge deck pavement in the alpine area, the actual pavement effect under the real load is studied by simulation simulation with the finite element analysis software relying on the construction of the bridge deck of No.1 Bridge of Haidong Avenue, Ledu District, Haidong city. Through different load positions and loading methods, the control load loading points are determined, and the parameterized analysis is carried out for the elastic modulus, thickness and temperature difference of the pavement, and finally the structural parameters of the pavement suitable for the bridge are obtained; the experimental analysis results show that the theoretical calculation idea adopted is feasible, and the measured value is within the expected range. It can be seen that the construction optimization measures and suggestions are of great significance to the construction of steel bridge deck pavement in the high cold area.
Indoor model test of red clay slope under evaporation-rainfall
Authors: Chen Kaisheng , Wang Qinqin , Luo Dipu , Zhou Bo , Zhang Kun
Published: November 2020

Evaporation-rainfall is one of the main causes of red clay slope failure. In order to explore the evolution law and mechanism of red clay slope failure under evaporation-rainfall, this paper takes Guizhou red clay as the research object, establishes slope model in laboratory, and analyzes the failure characteristics, failure mode and failure mechanism of red clay slope under evaporation-rainfall. The test results show that the failure mode of red clay slope under evaporation-rainfall is: splash erosion and surface erosion stage → crack development stage → gully formation stage → gully development stage → local collapse stage → slope foot collapse stage. During the test, there is no obvious sliding surface on the slope. In the process of rainfall, the free water inside the slope converges to the foot of the slope under the action of gravity, which results in the maximum moisture content at the foot of the slope, and the strength of the soil decreases sharply. The local collapse occurs at the foot of the slope first. When several collapses are connected and the structure of the slope foot cannot support the weight of the upper shallow soil, the collapse occurs to the middle and upper part of the slope exhibition.
Study of the New Neighborhood Units in the Chinese Context
Authors: Ye Xincheng , Zhang Qi
Published: November 2020

New Urbanism proposed a TND (traditional neighborhood development) model and a series of laws of form, to deal with this issue from the urban typology levels to face the suburbanization of America. Current Chinese urban environment is becoming more sophisticated, to deal with all kinds of urban problems by blindly applying New Urbanism law is impossible. This paper proposes a new unit of neighborhood paradigm based on the way of life under the Chinese context, trying to experience the type of development approach, from the topological level to deal with urban Chinese context.
Investigation on applied automatic monitoring of deep foundation-pit projects
Authors: Hu Xiaolong , Huang Zhixing , Geng Pei
Published: November 2020

A deep foundation-pit project in Shenzhen is studied for the application of automatic monitoring in the construction of deep foundation pit. Based on the analysis results of a three-dimensional finite element model implements with the MADIS GTS software, nine monitoring items and 59 automatic monitoring points are arranged in the key areas of the foundation pit, to monitor in real time the pit-top horizontal displacement, pit-top settlement, column pile settlement, groundwater level, horizontal displacement of deep layer, axial force in the supporting structure, anchor-cable stress, and settlement and cracks of the surrounding buildings. Based on the results of automatic monitoring, the patterns of variation are discussed of the data of the monitored items, and the accuracy and data stability are analyzed of the monitoring sensors such as measuring robot, hydrostatic level and crack gauge. The results show that: the key areas of automatic monitoring determined by the three-dimensional finite element model are in good agreement with the actual situation on site; Under the given conditions, the sensors such as measuring robot, hydrostatic level and crack gauge can meet the required monitoring accuracy, and the measured data has high stability; in addition, the sensor value is closely related to the ambient temperature. These results can provide reference for similar projects.
Influence Of Overload On Transverse Distribution Of T-beam Bridge
Authors: Du Wei Qiang , Tao Li
Published: November 2020

In order to study the influence of overload on the transverse load distribution of T-beam bridge, according to the different failure position and failure form of main beam, nine working conditions are divided for finite element simulation, and the transverse distribution value of each main beam under each working condition is obtained, and compared with the value under general load. The results show that: if the bridge transverse connection is damaged, the lateral load distribution capacity of the structure will be reduced again, and the stress form of the structure will become more unreasonable.
Research on Construction of smart community Based on GIS
Authors: Guo Chunlei , Zhang Chunmei , Wang Gang
Published: November 2020

At present, the construction of smart city in China has become an upsurge. As the basic unit of smart city construction, smart community is also in full swing. Residents are in pursuit of better quality of life. Intelligent community makes government management easier. Comprehensive monitoring and intelligent access control ensure the safety of the community and help the construction of smart city.
The Development Strategy of New Urbanization Based on Resilient City Theory
Authors: Liang Jing , Liu Yajing , Ma Lingyong , Xu Xiaoli , Liu Hongcheng
Published: November 2020

This year is the closing year of the “National New Urbanization Plan” issued by the State Council. During this time, the urbanization of China has achieved in-depth development in theory and practice, but it has also encountered many problems in the actual advancement stage. The theory of resilient city has important guiding significance for the sustainable development of new urbanization. Based on the summary of the resilient city theory, combined with China’s new urbanization with Chinese characteristics, the value of the resilient city theory for new urbanization is analyzed from the five perspectives of the city’s natural resilience, economic resilience, social resilience, organizational resilience and technical resilience. And from these five perspectives, it puts forward guiding opinions on the development strategy of new urbanization.
Optimization of Horizontal Freezing Scheme for Complex Curtain
Authors: Yu Changyi , Lu Mingyue
Published: November 2020

In view of the difficulty of theoretical calculation for complex curtain with complex form of subway connecting passage freezing method, this study simulates the subway connecting passage freezing method construction with finite element method based on a practical project. The effects of different temperature cold sources, different thermal insulation materials around the subway tunnel lining, and different layout of freezing pipes on the freezing period are mainly studied. The results show that the thermal insulation materials around the subway tunnel lining have little influence on the freezing period, while the freezing cold source temperature and the arrangement of freezing pipes have great influence on the freezing period. The research content of this paper provides an effective reference for the freezing construction of subway connecting passage and an effective analysis method for designers.
Study on the Unconfined Compressive Strength Test of Liquid Soil Materials
Authors: Zhang Yi , Guo Dandan , Huang Chongwei , Chen JuanJuan
Published: November 2020

Aiming at the unconfined compressive strength of the new self-flow platform backfill material which is called liquid soil, indoor tests were carried out with electro-hydraulic pressure testing machine. The effects of different water content, cement content, admixture type and admixture content on the strength of liquid soil are comprehensively analyzed. The results show: the influence of water content on the strength of liquid soil is obvious, and the function relationship of the quadratic equation is presented between them. The unconfined compressive strength of liquid soil increases remarkably with the increase of cement content, showing a trend of e-index growth. The active mineral powder has a certain increase in strength but a lower rate of increase. The water reducing agent slightly increases its strength and then slightly decreases and medium sand makes its strength increase significantly.
Teaching Reform and Exploration of Graduation Design for Civil Engineering
Authors: Liu Xiaoling , Du Peng , Wu Shengchao , Hao Yang
Published: November 2020

The civil engineering graduation design is an important indicator to measure the quality of professional teaching and assess the comprehensive ability of students. Taking the civil engineering major of Haikou University of Economics as an example, using research and statistical analysis methods, the status analysis of the civil engineering graduation design was carried out, the specific problems in the practice process were exposed, and effective improvement measures were put forward. The graduation design teaching provides a certain reference for the civil engineering major of private universities.
Research on the Activation of the Old City Zone from the Perspective of Community Construction -Taking Front of customs street in Macau as an example
Authors: Zou Yitong
Published: November 2020

Under the background of high urbanization, the living environment of the old city gradually failed to keep up with the pace of urban development. The old urban area carries the memory and culture of urban development. How to protect and activate the old urban area has become the focus and difficulty of urban renewal. Due to the nature of land and legal regulations in Macau, the historical city of Macau can completely retain many buildings with different styles in such a dense area. At the same time, it is also limited by the nature of Macau’s land and related laws, and the renovation of the old city is not satisfactory. This article mainly uses the literature search method and case study method to study the current situation of the protection and activation of Macau’s old urban areas. This article will take Front of customs street in Macau as an example to discuss how to realize the activation of the city’s old city from the perspective of community construction, with a view to preserving the context of the old city, improving the living environment, improving the quality of life of residents and promoting the sustainable development of the city.
Study on stability calculation method of red clay slope based on composite sliding surface
Authors: Chen Kaisheng , Wang Qinqin , Luo Dipu , Zhou Bo , Zhang Kun
Published: November 2020

The stability of the red clay slope is poor, and the long-term exposure to the atmospheric environment is prone to instability and damage due to the dry-wet cycle. The simplified Bishop method to calculating the stability of the red clay slope is inconsistent with the actual situation. The failure characteristics and mechanism of the red clay slope are analyzed, and the existing problems of the red clay slope stability calculation are pointed out. The red clay slopes in Guizhou Province are dominated by shallow failures. Local collapse and collapse failures are very common. Overall destruction is relatively rare. A stability analysis method for red clay slopes based on composite sliding surfaces (fold-line - circular arc) is proposed. In the stability analysis of clay slope, the soil body is divided into three layers of upper, middle and lower fissure areas, and different strength indexes are selected in different areas. It is recommended to consider the effect of hydrostatic pressure generated by the water column in the fracture on the stability of the red clay slope.
Research on the Effect of Under-Aged Concrete Arch Grouting for Ultra-High Arch Dam in Alpine-Cold Region
Authors: Shi Li , Zhang Ying , Huang Peng , Di Shengjie
Published: November 2020

In order to study the concrete excessive early stress and cracking risk caused by early cooling rate after the arch grouting of the ultra-high arch dam in alpine-cold region, the effect of grouting water cooling and temperature compensation are analysed. The results show that the under-aged concrete arch grouting in the constrained area, especially the strong constrained area, cause a large tensile stress due to continuous cooling and there is a risk of cracking. In actual construction, the early concrete temperature drop rate should be strictly required. Sealing at different ages has a certain effect on the later stress process. The tensile stress is the smallest at the 90-day age, the largest at the 60-day age, and the middle-sized at the 120-day age.
Improvement of water measuring equipment and urban waterlogging drainage during flood control period
Authors: Qi Haiyue
Published: November 2020

Since July 2020, an ocean of river flood water level warning lines in the middle and lower reaches of the Yangtze River have a critical period of flood controlling. Flooding’s condition is concerned with people’s interests and safety.This paper considers how to accurately forecast the water level and fasten the construction of urban water logging and drainage during floods. Imagine a tempered gauge with thin bottom steel and solar energy gauge used both rain and drought to predict the flood level and water volume more accurately, and do well in flood prevention in advance. At the same time, the attention of urban water logging will be further combined with the displacement and rate of the reservoir in the system to reduce loss during urban flooding period.
A brief review of the impact of distracted driving on traffic safety
Authors: Liang Xingcan
Published: November 2020

Nowadays, with the popularity of electronic devices such as navigation systems, smartphones, and other in-vehicle systems, the number of factors triggering distracted driving is increasing, making distracted driving one of the significant causes of traffic accidents. This paper attempts to summarize the present research situation of the impact of distracted driving on traffic safety, highlights the research methods and trends, then proposes future research directions.
Development brushless direct current electric motor of the Pilger mill drive for the technology of seamless pipes manufacturing based on the magnetic system with claw-poles
Authors: Kosimov Bakhtiyor , Gandzha Sergey , Aminov Dilshod , Davlatov Azamdhon , Gulov Dilovar , Abdulloev Ilbom
Published: November 2020

Currently, metallurgical industry contains a large number of morally and physically outdated electrical equipment that requires modernization. It requires a large capital expenditure to replace it. For this reason, it is slow to implement, long-term use for the purpose of payback, and slow to withdraw from manufacturing. In this regard, the new equipment must be innovative and in many respects ahead of the existing level of development of the industry. The article suggests such a solution. To replace the existing collector motor of the pilger mill drive for the manufacturing of seamless pipes, which has been operating since 1928 and is in a critical condition, a large-sized low-speed brushless motor with a large built-in inertial mass is proposed, which has a permanent magnet magnetic system and claw-poles. Such a technical solution for drives of this class has not been used in the world. The motor eliminates the existing 120-ton flywheel, improves reliability due to contactless current supply, and reduces operating costs by eliminating excitation losses. The motor design allows its Assembly without additional tooling, which is very important for large motors with permanent magnets. To develop a unique motor, a design system consisting of a synthesis subsystem and an analysis subsystem was created. The synthesis subsystem implements multi-level single-criteria optimization. As a result of its operation, the optimal geometry is determined based on the selected criterion. The analysis system confirms the calculation reliability using simplified optimization methods and finally removes technical risks before manufacturing an industrial design. It is based on the well-developed Ansys Electronics Desktop and Ansys Icepak systems for CAE electric machines. The analysis has several stages, which includes electromagnetic and thermal analysis. It is based on the well-developed for CAE systems electric machines Ansys Electronics Desktop and Ansys Icepak. The analysis has several stages, which includes electromagnetic and thermal analysis. The effectiveness of the design system was tested on a real project that was performed for the Chelyabinsk rolling mill. This approach is recommended for the design of other similar types of brushless direct current drive.
Electrochemical deposition of a radionuclide nickel-63 on betavoltaic cells for a nuclear battery based on silicon p-i-n junctions
Authors: Ershova N A , Krasnov A A , Legotin S A , Rogozev B I , Murashev V N
Published: November 2020

This paper highlights the manufacturing process of two types of betavoltaic cells with a source coated with 63Ni: the flat one and one with a three-dimensional (3D) microchannel structure, obtained by anodizing silicon (Si). Thin-layer deposition of a nickel-63 radionuclide was carried out from the ammonium-citrate based electrolyte solution, designed for production until exhaustion.
Induction heating system for die tooling of press for isothermal stamping of large-sized parts
Authors: Frizen V. , Tarasov F , Bychkov S. , Fatkullin S. , Sarapulov S.
Published: November 2020

The paper describes the installation for stamping large-sized parts. The use of induction heating for heating the working tool of the stamp in the operating mode is considered. A system with 4 flat inductors is described. This solution allows for the most efficient hot stamping operation compared to other known solutions. An example of the result of numerical simulation of the temperature field distribution is demonstrated.
Issues of induction sorting of scrap and waste of non-ferrous metals
Authors: Zyazev M E , Lyampasova E S , Abdullaev Z O , Yu Konyaev A
Published: November 2020

Nowadays, one of the main economic advantages is using secondary raw materials for the production of useful materials for further use. The greatest environmental and economic effect provides the use of secondary non-ferrous metals. Eddy-current separation based on interaction force of a magnetic field with eddy currents induced by this field in conducting particles, is the most effective for the recycling of non-ferrous metals. The paper is devoted to the problem of non-ferrous metals sorting. The research results of the number of traveling magnetic field separators designs are described. The ways of improving separation efficiency are shown. Eddy-current separators can be used as stand-alone solutions, and in combination with shredder and classifying systems, in a variety of recycling plants and at metallurgical enterprises for non-ferrous metals refinement.
Liquid metal free surface dynamics in rotating permanent magnet stirrer
Authors: Dzelme V , Jegorovs A , Jakovics A
Published: November 2020

We study liquid metal stirring by rotating permanent magnets in a laboratory-scale rectangular glass container. The main goal is numerical model validation using experimental free surface shape data. We find reasonable agreement between the experiments and coupled liquid metal magnetohydrodynamics simulations. Since the surface tension forces are not dominant here, free surface is deformed mainly by the dynamic pressure of the bulk flow. Therefore, we can conclude that not only the free surface profile is similar to experiments, but the bulk flow must be also very similar.
Machine learning application for magnetohydrodynamic pump research
Authors: Tarchutkin N V , Smolyanov I A
Published: November 2020

The article is devoted to finding out best machine learning model used for the analysis of magnetohydrodynamic pump. The machine learning model was created on the basis of data obtained as a result of numerical simulation of the unit using COMSOL Multiphysics. The paper compares errors of output data collected by using various machine learning methods for out-of-sample data.
Mathematical modeling of mutual operation of superconductive devices in autonomous power engineering
Authors: Chubraeva L I , Timofeyev S S , Lazerko V A
Published: November 2020

The paper presents results of mathematical modeling of mutual operation of electromechanical energy converters: high temperature superconductive (HTSC) synchronous generators and motors. It includes modes of operation of synchronous alternator and synchronous motor, mutual operation of alternators of comparable rating in an autonomous energy installation, mutual operation of synchronous HTSC motor and semi-conductive converter, influence of semi-conductive converter on the loss value in HTSC armature windings. In all cases specific features of HTSC electrical machines and their parameters and peculiarities of HTSC windings are accounted for with imposed restrictions on the current and magnetic flux variation velocity.
Method for modeling the modes of induction heating of turbine blades
Authors: Lepeshkin A R , Kuvaldin A B , Lepeshkin C A , Guanghua Z , Nazarov V V , Ilinskaya O I
Published: November 2020

In this paper there are offered calculated and experimental methods of simulating the high-speed modes of induction heating and designing the new inductor to provide the preset nonuniform thermal and thermostress state for cooled and uncooled blades of gas-turbine engine by changing the inductor width (specific power of induction heating). The peculiarity of this technique is the possibility of conducting the thermal cyclic tests of gas-turbine-engine parts with remaining the guaranteed minimal constant clearance between inductor and blade surface that reduces the probability of temperature-field distortion in changing the blades and promotes the efficiency enhancement of induction heating. Obtained results were used to conduct the tests of blades of gas-turbine-engine turbine. Carried out tests at this set with using the high-speed modes of induction heating helped to reveal quickly required changes in the blade structure.
Research of various inductors configurations for heating titanium slabs
Authors: Shmakov Evgeniy , Frizen Vasiliy , Nikolaev Dmitriy
Published: November 2020

In this paper various inductors configurations for heating a titanium slab, as well as the influence of frequency changes on efficiency of inductors are considered. The calculations are carried out by means of finite element method. In this research a three-dimensional time-harmonic model in A-formulation of Maxwell’s equations is used. In the framework of this work, only electromagnetic problem was calculated, since the main aim of this work is to assess the effectiveness of inductor configurations in terms of electromagnetic problem. Efficiency of inductor and the uniformity coefficient introduced herein have been chosen as the comparison parameters. Ultimately, distribution of electromagnetic power density in the workpiece is shown, also conclusions are drawn for each of inductor configurations.
High voltage electric power supply system with contactless power take-off
Authors: Frizen V , Antipin A , Lapin A , Udintsev V
Published: November 2020

Autonomous power supplies of light marking, monitoring, relay protection and emergency control systems of digital high voltage networks are considered, in particular, capacitive power take-offs from high-voltage three-phase power lines with voltage of 110 and 220 kV. Energy is collected in the immediate vicinity of the equipment, ensuring its operation without laying a separate power supply network and with minimal human involvement. The results of the analysis show a rather high technical and economic efficiency of the considered power supply system.
Development of a Physiologically Based Pharmacokinetic Model for Prediction of Ethanol Concentration-Time Profile in Different Organs
Authors: Sadighi Armin , Leggio Lorenzo , Akhlaghi Fatemeh
Published: November 2020

Aims

A physiologically based pharmacokinetic (PBPK) modeling approach was used to simulate the concentration-time profile of ethanol (EtOH) in stomach, duodenum, plasma and other tissues upon consumption of beer and whiskey under fasted and fed conditions.

Methods

A full PBPK model was developed for EtOH using the advanced dissolution, absorption and metabolism (ADAM) model fully integrated into the Simcyp Simulator® 15 (Simcyp Ltd., Sheffield, UK). The prediction performance of the developed model was verified and the EtOH concentration-time profile in different organs was predicted.

Results

Simcyp simulation showed ≤ 2-fold difference in values of EtOH area under the concentration-time curve (AUC) in stomach and duodenum as compared to the observed values. Moreover, the simulated EtOH maximum concentration (Cmax), time to reach Cmax (Tmax) and AUC in plasma were comparable to the observed values. We showed that liver is exposed to the highest EtOH concentration, faster than other organs (Cmax = 839.50 mg/L and Tmax = 0.53 h), while brain exposure of EtOH (AUC = 1139.43 mg·h/L) is the highest among all other organs. Sensitivity analyses (SAs) showed direct proportion of EtOH rate and extent of absorption with administered EtOH dose and inverse relationship with gastric emptying time (GE) and steady-state volume of distribution (Vss).

Conclusions

The current PBPK model approach might help with designing in vitro experiments in the area of alcohol organ damage or alcohol-drug interaction studies.
Tyranny in America, or, theAppeal to the Coloured Citizens of the World
Authors: Duquette Elizabeth
Published: November 2020

Locating the Appeal to the Coloured Citizens of the World within a tradition of antityranny writing from antiquity through the Declaration of Independence, this article traces David Walker’s precise redefinition of the relationship between tyranny and slavery. Rejecting the longstanding idea that enslavement is a social, rather than a political, institution, Walker points to the pernicious effects of representing tyranny as a kind of enslavement, particularly when coupled with the denial that slavery is a form of tyranny. In tandem with its vehement denunciations, the Appeal offers a nuanced argument that American slavery is nothing other than tyranny; those suffering under its abuses have both a right and a duty to rebel against its abuses.