bluuebunny/crossref_metadata_2025_split huggingface dataset:
Estimation of probabilistic seismic hazard for Aizawl city in North Eastern India (NEI)
Authors: Rahman T , Ricky L , Chhangte  
Published: July 2020

Abstract
It is common practice to describe seismic hazard in terms of Peak Ground Acceleration (PGA) and Spectral acceleration (Sa). Response spectrum representation of ground motion is directly applicable in structural response analysis. However, in India, engineers have been using a standard response spectral shape as recommended by the code IS-1893:2016 all over the country, modified only by a zonal factor representing the PGA of unknown probability of occurrence. This approach is silent about the various seismo-tectonic sources and non-uniform level of hazard at different parts of India. Thus, the expected or desired design life of structures cannot rationally harmonize with existing earthquake hazard and economical construction practices. Whereas, the underestimation of the hazard will lead to questionable safety margins, overestimation makes the projects uneconomical and hence social goal suffers in either case. It is in this context, Probabilistic Seismic Hazard Assessment (PSHA) that addresses engineering safety issues with quantifiable risk levels has become more popular. Now-a-days, seismic hazard maps are prepared in different countries for a given annual frequency of exceedance. With this in mind, probabilistic seismic hazard for Aizawl City has been prepared.In this study, we have estimated seismic hazard for different return period in Aizawl city. The active fault within 300 km radius of the city are considered for this study. The seismic hazard values estimated in this study will be useful for the structural designers of Aizawl city and its adjacent region to design various types of Engineering Structures.
Rheological and mechanical characterization of self-compacting concrete with utilization of supplementary sustainable cementitious materials
Authors: Ealiyas Mathews Mervin , Anand N , Prince Arulraj G , Kiran Tattukolla 
Published: July 2020

Abstract
Self-Compacting Concrete (SCC) being a sustainable high-performance concrete capable of flowing through congested reinforcement and can fill the shuttering without any external energy. The investigation focuses on the effect of waste materials generated from industries on the fresh and mechanical properties of SCC. Experiments were carried out to develop SCC by using Fly Ash (FA) and Ground Granulated Blast Furnace Slag (GGBFS) as Supplementary Cementitious Material (SCM). Light weight Perlite Aggregates (PA) were used as a partial replacement material in M-Sand. Workability tests were conducted to check the rheological properties of developed SCC mix in accordance with the European Federation of National Associations Representing for Concrete (EFNARC) guidelines. An optimal mix was developed satisfying the criteria as per EFNARC. The developed mix design exhibited a significant reduction in cement content. Ordinary Portland Cement (OPC) was replaced with 31% of FA and GGBFS is kept constant at 31%. The specimens were cured in water under ambient temperature. Performance of the developed mix in terms of compressive strength at different ages of 7, 28, 56 and 90 days were also examined. The results showed that SCC developed with industrial wastes provide adequate workability and strength with a substantial reduction in the cement content. Hence, the developed SCC with FA and GGBFS along with PA can be used as a sustainable concrete due to its high strength for the infrastructure development.
Effect of reduced graphene oxide on the mechanical properties of concrete
Authors: Jyothimol P , Hazeena R , Issac Manoj T , Mathiazhagan A 
Published: July 2020

Abstract
Reduced Graphene oxide (rGO) is a 2D nanoplane fiber that contains highly reactive hydroxyl, epoxide, carboxyl, and carbonyl functional groups. These oxygen bearing functional groups increases solubility in cement matrix and serve as a nucleation agent for C-S-H crystals. rGO can serve as a reinforcing material in cement composites and can improve the mechanical properties of cement-based materials. This paper presents the mechanical properties of concrete modified with 0.03%, 0.05% and 0.07% reduced grapheme oxide by the weight of the OPC. Compressive strength of concrete was found to be increased by rGO especially the early age strength due the hydration acceleration and reinforcement of cement matrix and strong adhesion between aggregate and cement matrix by rGO. The mechanical properties, compressive strength, split tensile strength, flexural strength and modulus of elasticity are found to be maximum at 0.05% rGO replacement by the weight of the cement. The properties were found to be decreased at 0.07% of rGO content due to the formation of the agglomerated structure and poor dispersion of rGO.
Effect of binder chemistry on sulphate resistance of fly-ash blended cement concrete mixes
Authors: Nazeer M , Narasimhan M C , Rajeeva S V 
Published: July 2020

Abstract
The chemical durability of concretes exposed to sulphate environment largely depends on the quality and quantity of products of cement hydration. Certain hydration products are readily reactive with the sulphate ions and form expansive products such as gypsum and ettringite. On the other hand, some sulphate compounds participate in reducing the cementing property of hydration products. These reactions cause expansion and deterioration of strength of concrete. Sulphate resistance of concrete can be improved by the incorporation of Supplementary Cementitious Materials (SCMs). Reduced water-binder ratio and proper curing can make concrete more durable in sulphate environment. This paper reports the details and results of an investigation of effect of chemical composition of binder materials on the sulphate resisting property of concrete exposed to a rich MgSO4 solution. The effect of initial curing is also investigated so that it may be possible to suggest the mix compositions for typical field applications of concrete. The variables investigated in this report are the oxide composition of binder components and the initial curing conditions. A set of concrete mixes, all with a constant binder content and water-binder ratio are used in the investigation.
Pile induced filtering of seismic ground motion in homogeneous soil
Authors: Varghese Ramon , Boominathan A , Banerjee Subhadeep 
Published: July 2020

Abstract
The foundation input motion (FIM) that a structure experiences during an earthquake, is known to be different from the free field ground motion due to soil structure interaction (SSI) effects. Kinematic interaction in a single pile can also introduce a rotational component to the FIM. Conventionally, soil structure interaction is performed by applying the free field ground motion to the structure ignoring the effects of kinematic interaction. Deep foundation elements such as piles are known to suppress certain frequencies of ground motion which in turn induces kinematic bending moments in them. In this study, kinematic soil pile interaction is simulated using 3D numerical models using a coupled finite element-boundary element method. Single pile, group pile and piled raft models in a homogeneous soil profile are analysed for vertically propagating shear waves. Three earthquake time histories with varying frequency content are considered in this study. Transfer functions are then plotted together to analyse the effects of pile induced filtering of ground motion. The ratio of response spectrum at the foundation level and free field ground, for the pile group considered, is found to closely follow the behaviour of a fixed headed single pile. It is found that embedment of the pile cap, as in the case of a piled raft can result in further filtering of ground motion.
Are the preferences of travelers same across cities? A tale of two Indian cities
Authors: Fairooz Cheranchery Munavar , Madhukumar Raji Prathibha , Surendran Silpa , Navab Nourin , Sindhu Nath Abhijith , Padu Kiyum 
Published: July 2020

Abstract
The paper reports an investigation on the preferences of travelers in two Indian cities. The importance of travelers was collected from Kolkata and Kollam cities using 5-point Likert-type importance scale, and RIDIT analysis was carried out to obtain the priority rankings of travelers. A three-level analysis was carried for travelers, captive riders (travelers without car), and choice riders (travelers with car) of the two cities. The priority ranking obtained for the travelers of two cities were then compared using Spearman’s rank correlation test. It was shown that there is a substantial difference in the perception of travelers from two cities. This was instrumental in establishing the fact that preferences of travelers are not transferable across the cities. Therefore, the selection of attributes for WTP studies require a separate investigation to understand the preference of travelers of the city under consideration. On-board safety was identified as a major concern for the travelers of Kolkata and Kollam cities, which clearly shows the importance of addressing safety issues for enhancing the quality of public transport. The results obtained from the present work is city specific. However, the derived insights are expected to encourage researchers and policymakers to carry out separate investigations in various cities for identifying important attributes prior to behavioural studies.
Preparation and Characterization of (Na0.48K0.52)(Nb0.90Sb0.10)O3 Lead-free Ferroelectric Ceramics With MnO2 Sintering Aids
Authors: Li Min , Yang Xiaohong , Chen Jianbing 
Published: July 2020

Abstract
Lead-free (Na0.48K0.52)(Nb0.90Sb0.10)O3-xwt% MnO2(x = 0.2, 0.8) ferroelectric ceramics were prepared by solid state sintering methods with MnO2 aids. The X-ray diffraction analysis revealed that the the (020) peak shifts to higher angles at x=0.8 suggested that the lattice parameters decreased. The reason is that the Mn4+ may entering the Nb5+sites. The largest maximum strain Smax was 0.13 % under 40 kV/cm at room temperature.
Research on Pipeline Robots with Obstacle Crossing and Turning Ability
Authors: Wei Hangxin , Cheng Panghu , Wang Xiaorong , Song Xinai 
Published: July 2020

Abstract
The pipeline robot will encounter complex conditions of turning, obstacles and pipe diameter changes when it works. Therefore, cornering performance, obstacle crossing performance, and diameter changing ability are important indicators of the pipeline robot performance. A multi-axis differential adaptive pipeline robot is designed. The multi-axis differential mechanism is used to realize the smooth turning of the robot. The pre-tightening and reducing mechanism is used to achieve the obstacle crossing of the robot and the ability to adapt to different pipe diameters. The overall structure of the pipeline robot, the transmission mechanism, and the pre-tightening and reducing mechanism are introduced. The kinematics model of the robot is studied when it crosses obstacles. Using the maximum height of the pipeline robot passing through obstacles as an indicator, an equation of the pipeline robot obstacle crossing is established. The ADAMS software is used to simulate the kinematics of the turning process of the pipeline robot. Through the simulation experiments, the following conclusions are obtained: (1) The larger the adhesion coefficient between the pipe wall and the wheel, the stronger the obstacle crossing ability of the pipeline robot. The larger the diameter of the wheel, the stronger the ability to overcome obstacles. (2) By tracking the changes in the angular velocity of the three driving wheels, it is shown that the pipeline robot can pass through the curve smoothly and has anti-motion interference performance.
Analysis and Research on the Change of Landscape Ecological Pattern in the Surrounding Area of Guishan in Yuyao City
Authors: Gao Yuanyuan , Zhao Tiezheng , Zhao Yang 
Published: July 2020

Abstract
In this study, the area around Guishan in Yuyao is taken as the research object, and data processing and analysis are carried out by using Fragstats 4.2 and other software. The changes of the land use landscape pattern in the area in 2012 and 2019 are analyzed to provide basic research for the future ecological sustainable planning and development of the area. The results show that the degree of landscape heterogeneity of the overall landscape pattern in the study area is gradually increasing, and land use is developing toward diversification and homogenization. This is because in the process of urbanization, the landscape ecological pattern in the study area will inevitably be affected by many factors and changed. Therefore, through quantitative analysis of the landscape ecological pattern change process in the study area, it can reflect more scientifically changing process, which is conducive to scientific and reasonable planning for the next step, and thus better maintain the balance of natural ecology. Through quantitative analysis of the landscape ecological pattern change process in the study area, it can reflect its change process more scientifically, which is conducive to the next step to provide a basis for scientific and rational planning and better maintain the balance of natural ecology.
Research on Environmental Quality Evaluation System of Coordinated Development of the Beijing-Tianjin-Hebei Region
Authors: Hao C X , Ge C Z , Qin J L , Chen Z W , Zhou Q , Qu A Y , Peng C , Li N , Dong Z F , Hu Rui 
Published: July 2020

Abstract
Since the coordinated development plan of Beijing-Tianjin-Hebei region was put forward, environmental protection and pollution control have become the primary breakthrough of coordinated development. The ecological environment problem in Beijing- Tianjin-Hebei region has been the bottleneck factor restricting the integrated development. It is of great significance for environmental protection and economic development to establish a coordinated assessment mechanism for ecological environment quality in Beijing-Tianjin- Hebei region. This study analyzed the progress and effectiveness of the assessment of ecological environment quality in Beijing-Tianjin-Hebei region, analyzed the problems and challenges in the assessment of ecological environment in Beijing-Tianjin-Hebei region, and put forward some suggestions on the establishment of the mechanism of joint environmental prevention and control under the coordinated development of Beijing-Tianjin-Hebei region.
Analysis of Carbon Emission Efficiency in Belt and Road Agriculture
Authors: Ye Du , Poyi Zhu , Yan Gong , Keshan Zhao , Shiwen Chen , Ying Zhou 
Published: July 2020

Abstract
This paper will calculate the carbon emissions and their growth rates in 30 regions except Tibet and Hong Kong, Macao and Taiwan. It will also outline 17 regions with strategic priorities along the Belt and Road: Xinjiang, Shaanxi, Gansu, Ningxia, Qinghai, Inner Mongolia, Heilongjiang, Jilin, Liaoning, Guangxi, Yunnan, Shanghai, Fujian, Guangdong, Zhejiang, Hainan and Chongqing. It will also calculate the carbon emissions share of major agricultural carbon sources. Based on the analysis of the influencing factors of agricultural carbon emission efficiency in the belt and road initiative, the SBM model and ML model are used to evaluate and analyze the agricultural carbon emission efficiency in the belt and road initiative region from the static and dynamic perspectives respectively. The results show that: (1) the average carbon emission in the belt and road initiative region from 2014 to 2017 is 4.4396 million tons, which is lower than the national average of 5.0883 million tons; (2) animal husbandry and cultivation activities become the two major sources of carbon emission; (3) from DEA model, it can be seen that the belt and road initiative region accounts for 5 of the 8 regions with effective carbon emission in 2017, while Heilongjiang province has the largest range of arable land and total power of agricultural machinery to be adjusted among the regions with carbon emission efficiency of 0.75 to 1. (4) During 2014-2017, the average ML index in the belt and road initiative region is 1.042, which is greater than 1, of which the average tech index is 1.045 and the average effch idex is 0.998, indicating that the overall agricultural carbon emission efficiency is on the rise.
Study on Composite Control Strategy of Transient Air-Fuel Ratio for Gasoline Engine Based on Model
Authors: Song Dandan , Li Yuelin 
Published: July 2020

AbstractThe control accuracy of transient air-fuel ratio of gasoline engine is a difficult problem in the current engine control system. To achieve effective control of transient air-fuel ratio for gasoline engines, a composite control method is proposed, which consists of inverse model feedforward based on least squares support vector machine(LS-SVM)and feedback control with model-free adaptive control(MFAC).Feedforward control can accurately estimate the intake air volume in the cylinder. Neither feedforward or feedback control can achieve better control results. A composite control strategy based on feedforward + feedback is proposed. The feedforward model is used to perform dynamic feedforward compensation of the intake air amount in the transient air-fuel ratio, and in combination with feedback control, the air-fuel ratio is feedback-controlled by modifying the fuel injection amount, and system disturbances and errors are corrected. In this paper, two composite control strategies are designed for the air-fuel ratio of the engine under transient conditions. The results show that the inverse model based on LS-SVM can accurately approximate the air fuel ratio transient process, and this method has stronger robustness and anti-interference combined the MFAC feedback control. Therefore, the composite control strategy has good control performances and can improve the control precision of air-fuel ratio in transient conditions.
Admittance and Management of Urban Industrial Lands
Authors: He Zhimin 
Published: July 2020

Abstract
Because of the increasingly serious situation of environmental protection and lands supply in China, the research on control technology of industrial lands must be carried out to eliminate the enterprises of outdated technology and overcapacity, optimize industrial structure and protect land resources. Through the methods of statistical analysis and comparative analysis, the paper studies the index system of industrial lands in typical cities of Yangtze River Delta, Pearl River Delta and the Central Urban Agglomeration, analyzes the problems existing in approval and management of industrial lands, and puts forward suggestions on the construction of the index system and management process of industrial lands.
Study on the Material Properties of Cement-sand-gravel
Authors: Li Xiuwen , Zhang Shunfu , Wu Hao , Tian Dongcheng 
Published: July 2020

Abstract
Cement-sand-gravel dam is a new type of dam. The low-strength cement-sand-gravel material with low price is used for dam construction. This material is obtained by simply mixing water with a small amount of cement in the sand gravel of river bed or excavation waste slag and other materials easy to get near the dam site. In this paper, the effects of water binder ratio, fly ash, sand ratio, stone powder and other parameters in different mix ratio design on the properties of materials are studied. The results show that: (1) water to binder ratio has a great influence on the strength of cement-sand-gravel material; (2) fly ash can increase the later strength of cement-sand-gravel material; (3) when the sand ratio exceeds 25%, with the increase of sand ratio, the compressive strength of cement-sand-gravel material decreases sharply; (4) stone powder has a significant effect on the early strength.
Characteristics and Perception of Cultural Tourism Resources in Mt. Huangshan Scenic Spot
Authors: Zhu Shengdong , Gan Zhuoting , Yu Xiangyang 
Published: July 2020

Abstract
Taking Huangshan Mountain Scenic Spot as the research object, this paper explores the types, characteristics and perception of the cultural tourism resources of the double heritage scenic spot through collecting previous literature, on-site investigation and comparative analysis and other research methods. The results show that: (1) There are four types of cultural resources in Mt. Huangshan Scenic Spot, namely, cliff stone carving, historical structure, literary works and cultural spirit; (2) Compared with Tai Mountain, Emei Mountain, Wuyi Mountain and other world cultural and natural heritage sites tourists have low perception of cultural tourism resources in Huangshan Mountain Scenic Spot; (3) Factors such as typical natural attribute, single tourism product and seasonal tourists flow are the main influencing factors of low perception of cultural tourism resources in Huangshan Mountain Scenic Spot. Paying attention to resource mining, strengthening product design and expanding the scope of publicity, etc. can increase tourists’ perception of cultural tourism resources in Huangshan Mountain Scenic Spot.
Research on the Application of Automatic Monitoring Software for Seismic Observation Instruments
Authors: Wang Zhe , Teng Yuntian 
Published: July 2020

Abstract
Combining with the actual monitoring work of seismic geophysical observation stations, a seismic monitoring instrument automatic monitoring software was developed. The software is suitable for real-time or regular automatic network monitoring of IP instruments and equipment under different network environments. Automatic monitoring of the clock, status and observation data of geophysical observation instruments, which can automatically identify invalid data and abnormal amplitude changes in the observation data of the day, interference, earthquake and amplitude limitation, etc. Without other hardware and software, the alarm information can be sent to the duty personnel and management personnel by SMS, which can realize automatic backup and manual recovery of the original observation data of the instrument, and One-click restart and clock correction and other control operations, you can view the integrity and validity of the observed data curve and analysis data of the day without cross-platform operation, thereby achieving unified and efficient management of the instrument.
A Fast Tile-Pyramid Construction Algorithm Based on Multilevel Task Parallelism
Authors: Liu Haozheng , Wu Ye , Jing Ning , Feng Shihao 
Published: July 2020

Abstract
With the rapid development of satellite sensor technology and aerial photography technology, spatial and temporal resolution of the remote sensing image has been greatly improved. To speed up the visualization of remote sensing images, pyramid building technology is the best choice at present. However, the performance of existing methods is not as good as expected. Considering the load imbalance problem caused by the uneven data distribution problem, this paper proposes a fast tile-pyramid construction algorithm based on multilevel task parallelism. Our method changed the traditional parallel tile generation algorithm which is generated layer by layer and implemented a new algorithm that generated multiple layers at the same time by using the entire tile pyramid as a whole. Experimental results on real-life datasets show that our new algorithm can improve the construction speed of tile-pyramids.
Research on the Selection of Coordinate System of "Multi-conformity"
Authors: Lei Yong , Wang Lihui , Chen Zhu , Ren Chuanjian , Wang Zhihong 
Published: July 2020

Abstract
Multi-conformity is an inevitable trend of urban construction and development. The appropriate coordinate system is chosen with side length projection calculation and treatment of deformation in the area of large deformation side length projection, relying on the surveying and mapping technology of natural resources department to perform conversion processing. Eliminating the differences between natural resources departments and urban and rural construction departments due to different coordinate systems is to meet the requirements of engineering construction accuracy, under the premise of ensuring the quality of engineering construction, to meet the requirements of the Ministry of natural resources.