bluuebunny/crossref_metadata_2025 huggingface dataset:
Research on Safety Risk Assessment Technology of Expressway Traffic Operation
Authors: Wang Bo , Chen Renshan , Liu Wenjiang , Li Jin , Song Jie , Zhang Wei
Published: December 2019

Based on the theory of expressway traffic safety and the analysis of accident causes, the risks of expressway traffic operation safety is identified, and a multilevel traffic safety risk assessment system is established. Combined with the advantages of traditional risk qualitative and quantitative analysis methods, the Fuzzy Analysis Theory is introduced in the Analytic Hierarchy Process, the Analytic Hierarchy Process (AHP) is established to weight each related index, and finally the Fuzzy Analytical Hierarchy Process (FAHP) is applied to estimate the risk probability and risk loss. And then according to the risk probability, risk loss assessment and its grade standard, the two-dimensional risk assessment matrix is used to measure the traffic operation risk level and give basic risk management and control criteria. And finally based on the above evaluation system, the traffic safety risk of an important bridge across the Yellow River on the expressway from Beijing to Shanghai is analyzed and assessed.
Research on Minimum Safe Following Distance Model of Trucks on Slope-curve Section of Expressway
Authors: Zhang Fei , Zhang Yan
Published: December 2019

In view of defects in the existing minimum safety distance model, a model for calculating the safe distance on slope-curve section was built based on truck brake system and by fully considering the characteristics of drivers’ driving behaviors and defining the scope of slope-curve section of expressway, and the slope acceleration parameters of “slope-environment” were proposed to effectively calibrate the model, thus providing a basis for selecting the distance value of trucks and the location of traffic signs on slope-curve section. Besides, a following model for trucks was established with TruckSim 2016 software to analyze various indicators such as vehicle slip ratios and vehicle interval value under upslope and downslope states, which verified the effectiveness of the safe distance model.
Study on Application of Simulated Air Pollution Dust the Permeable Concrete
Authors: Yang Min-Jen , Wang Yu-Min , Wang Hong-Yu , Liang Chou-Fu
Published: December 2019

Impermeable pavement is usually adopted in pavement construction in Taiwan. Porous asphalt concrete employs features as water retention, cooling and promoting draining effect. However, with the increase of traffic volume and service duration, its draining function will decrease gradually, wherein porosity blocking is one of the major problems. The research aims at the analogue experiment on pervious concrete subject to dust blocking, which discusses the blocking status and changes in permeability due to natural dust fall and clump dust fall after rainfall. The experiment prepares 4 groups of mixing ratio. The aggregates are coarse and fine bottom ashes from the refuse incinerator. The proportion of cement is 130kg/m3 and 200kg/m3. The experiment simulates the influence and in-situ water permeability changes of specimens with different porosities been blocked by natural dust fall and then the dust been rushed into specimens by rainfall. Before the analogue experiment, the water permeability of 4 groups of specimens is 1399.75∼1412.91ml/15sec. The experiment adopts 2011 average monthly dust fall in Pingtung County and magnifies it by 10 to 20 times to simulate natural dust fall and clump dust fall on the pavement accordingly. It is known from the experimental results that due to the high porosity of pervious concrete, by ruling out other blocking factors, the natural dust fall has little influence on the water permeability of pervious concrete. While the simulation of clump dust fall is 15 times the natural dust fall, although water permeability the pavement is reduced sharply, it still meets the minimum 400ml/15sec of Japanese porous pavement technical indicator. It shows that the specimens have good permeability on future practical applications.
Research on Reasonable Design of the Front View Triangle Area of the Front Side of the Road Mixing Nose Based on Driving Safety
Authors: Han Xinyu , Wu Xuezhu , Jin Yi , Zhang Fei
Published: December 2019

In order to improve the limitation of formulation for sightline triangle area in Design Rules of Highway Grade Separation JDG/TD-2014, which is 100 meters before confluence nose for the main line and 60 meters before that for the ramp, this paper analyzes the driving and vision characters considering the driving safety. The reasonable design sizes of sightline triangle area for different mainline driving speeds are given, using the available sightline model.
Study on Long-distance Turn-around at Non-Signal Control Intersection of First-Class Highway
Authors: Wu Xuezhu , Jin Yi , Han Xinyu , Ye Ying
Published: December 2019

Long-distance turn-around is a traffic organization method to guide and improve left-turn vehicles at intersections. In this paper, the non-signal control intersection of the first-class highway is taken as the research object. The influence of different road conditions, traffic flow size and traffic control on the selection of long-distance turn is analyzed, and the location of long-distance turn is preliminarily determined by calculating the length of interlaced section. Through VISSIM simulation, the position of telemetry turn is finally determined.
Study on the mechanism of the influence of structural change on China’s carbon emissions
Authors: Yan Xiaoqing , Ma Xue , Zhang Xiangcheng , Li Nan , Ma Jiajun
Published: December 2019

Revealing the influential mechanism of important factors on carbon emissions of economy or industry is the premise of formulating effective emission reduction policies and implementing positive emission reduction measures, and also a hot research topic in academic circles. This dissertation constructs a theoretical model for analysing the mechanism of carbon emission impacts considering structural factors. The impacts of changes in demand and supply linkages in the production links of the economic subsystem are incorporated into the decomposition model, and key industries and factors affecting carbon emissions at the production and demand sides are identified and quantitatively analysed from the perspective of the subsystem. The main conclusions are as follows: The change in energy use structure and production efficiency is the main reason for the downward trend of carbon emissions. The effect of the change of demand structure on emission reduction is far less than that of the change of production structure factors, and the change of demand structure is not always advantageous to emission reduction during the research period. In the short term, promoting the optimization of production and demand structure is still an important effort to promote emission reduction. In the long run, the emission reduction effect of energy structure optimization is the most significant.
The Research of Debris Flow Disaster Prevention and Response System in Taiwan
Authors: Chen Shu-Tzu , Hsu Chung-Li
Published: December 2019

The Taiwan Disaster Prevention and Response Act had been issued and put into practice on June 30, 2000. Roughly, that the disasters prevention and response system with three levels, namely the organization of central, county, and township. Due to above plans, the Council of Agriculture, Executive Yuan, become the director organization for the debris flow disaster prevention, for this work promoting smoothly, the Council of Agriculture drawn up debris flow disaster prevention works from February 22, 2002, such as Operating Procedures for Debris Flow Disaster Evacuation, Operating Procedures for Collection and Reporting of Debris Flow Disaster Information, Implementation Guidelines for Debris Flow Disaster Prevention Education and Publicity, Operating Procedures for Forecasting and Warning of Debris Flow Disasters, and Operating Procedures for Prevention of Repeated Debris Flow Disasters and for Recovery and Reconstruction, in order to set up the implementation emergency practice mechanisms of debris flow disaster prevention and response system in each stages, and each kinds disaster prevention and response operation normalizing, combine, coordinate, and practice. Although that carry out already several years, but there were some cognitive problem between each level’s organization exultantly. Thus this research synthetically sums up the experience of carrying out from the aspects of decree, organization, and operation, to inspect and offer the suggestion of making a self-criticism, improving, and defend for the reference of Regional Disaster Prevention and Response Plan.
Study on Performance of Ground Source Heat Pump System Based on Active Chilled Beam
Authors: Yu Wenhong , Li Hui , Niu Xiaojie
Published: December 2019

This paper takes the ground source heat pump unit of a research and development centre in Beijing as the research object. This collected the operation data in the cooling condition and the heating condition respectively. Based on the measured data, this paper calculated the coefficient of performances and the energy efficiency ratio of the unit. The results show that when the active chilled beam is used as the air-conditioning terminal device, the inlet temperature of the heat pump unit is greatly improved. The ground source heat pump unit meets the standard and has a higher energy efficiency ratio; The operation of a single unit is more efficient than that of multiple units at the same time.
Indoor Thermal Environment Control System Based on Maximum Work Efficiency
Authors: Yu Wenhong , Bai Jinchao , Jiang Chaowen
Published: December 2019

Based on the indoor thermal environment on the influence of the office personnel work efficiency on the basis of experimental research. In this paper, a control method based on maximizing work efficiency is proposed, which aims at maximizing indoor staff’s work efficiency and rest efficiency, and takes Predicted Mean Vote (PMV) as control parameter to control indoor environment, taking into account the requirements of comfort. The operation effect of the control method based on maximum work efficiency is estimated. It is found that compared with the traditional control system based on PMV index, the system not only improves the work efficiency and rest efficiency of indoor personnel, but also is more comfortable. The indoor environment control system based on maximizing work efficiency is still in the theoretical stage. The construction and actual operation effect of the system need to be further studied.
Research on Safety Risk Assessment of Ninghai 4A Scenic Spots
Authors: Wang Qianqian , Kong Song , Chen Jianhua , Zhou Ying , Yu Chaolu , Huang Hui
Published: December 2019

With the rapid development of tourism, the tourist population is expanding. The security of tourist attractions is sensitive and fragile, and the accident risk is high and the social impact is great. Therefore, it is necessary to carry out risk assessment research. This paper takes Ninghai 4A scenic spot in Zhejiang Province as the research object, objectively identifies and analyses six kinds of accident risks such as firefighting, falling casualties and so on, establishes three-dimensional risk matrix model, and combines Borda ordinal value method to identify the main risk of scenic spot. Based on the risk identification and assessment, some reasonable risk management and control measures are proposed. Relevant research can provide reference for the safety risk assessment and control of similar scenic spots in China.
Spatial Distribution and Evaluation of Heavy Metal Pollution in Soil Around Coal Gangue in Fengfeng Mining Area
Authors: Zhang Yanjie , Zhang Haoran , Meng Lingyao , Wang Yunxia , Zhang Yan
Published: December 2019

Taking the soil around the coal gangue mountain in the Fengfeng mining area as the research object, 30 soil samples were collected in the east, southeast and southwest directions within 300m of the coal gangue mountain boundary, and the soil in the mining area was measured by inductively coupled plasma mass spectrometry. The contents of five heavy metals such as Cr, Pb, Cd, Cu and Zn were detected, and the spatial distribution characteristics, pollution status and ecological risk of heavy metals in the mining area were analysed. The results show that: (1) the five heavy metals content of Cr, Pb, Cd, Cu and Zn show different decreasing trend from the farther gangue heap and the increase of soil depth. (2) Referring to the background value of the national secondary soil environmental standard, among the five heavy metals in the soil, except for Cu and Cr, the average values of three heavy metals of Zn, Cd and Pb are higher than the soil background value; Single factor index evaluation results show that the Pb pollution is the most serious, followed by Cd pollution. The Nemero comprehensive index method shows that the surface soil is moderately polluted when the distance is zero in the three directions, and the rest places are mildly polluted. (3) According to the ecological risk assessment results, the order of potential ecological hazards of single heavy metals are ranked from strong to weak: Cd>Pb>Cr>Cu>Zn, and the soils are all slightly ecologically harmful.
Research Progresses and Needs on Fire Safety of Rural Building in Southern Region of China
Authors: Liu Yongjun , Liu Wenli , Luan Jingru , Tian Yujia
Published: December 2019

In recent decades, numerous rural buildings, especially residential ones in southern region of China, have been damaged seriously even destroyed totally by fire hazards. Fires in rural buildings can result in significant losses of life, property, and cultural heritage. Therefore, fire hazards in villages and towns are becoming a growing concern from common people, related experts, to central government. There are few literature on research of rural buildings exposed to fires in China. In this paper, several typical rural building fire cases are introduced firstly. Mechanism of fire spread and structure collapse is qualitatively investigated secondly. Some research progresses and needs on rural building fire in China are given thirdly. The authors hope this paper may provide valuable information for people who hope to learn about the current situation, research progresses and needs on fire safety of rural buildings in China.
Measurement and Study on the Torque Coefficient of Ordinary Bolts Before and After Galvanization
Authors: Wen Jiang , Wei Zhai , Jinhu Yang , Junfen Yang , Yuhao Zhan , Kai QU
Published: December 2019

Galvanization is widely applied to bolts as an anti-corrosion method in bolted connection of steel structures in power transmission engineer. After being galvanized by hot-dipping, the torque coefficient of bolts will be changed. To investigate this change, the torque coefficients of ordinary bolts in different grades and specifications were measured before and after galvanization. Results indicate that mean values and standard deviations of torque coefficients of the galvanized bolts increase to a certain extent, but the torque coefficients and the standard deviations tend to decline as the improvement of bolt specification, and the stress of ungalvanized ones is larger than that of hot-dip galvanized bolts in the same grade and specification.
Application of Electro-Sorption Desalination Technique in Water Treatment
Authors: Chen Kaiwei , Lin Hua , Lin Yi , Liu Zhaojun , Cai Tongbo , Chhuond Kong
Published: December 2019

Electro-Sorption Technology (EST) is also known as Capacitive Deionization (CDI).
It originated in the late 1990s. Electro-Sorption desalination technology is a new water treatment technology that uses the phenomenon of ions and charged particles adsorbed on the surface of charged electrode to enrich and concentrate dissolved salts and other charged substances in the water on the surface of electrode to realize water purification/desalination. As a new water treatment technology, Electro-Sorption technology (EST) has the characteristics of low inlet water quality, reliable operation, low energy consumption, convenient operation, high water yield and low comprehensive operation cost. The electrode material with high activity is the key to obtain its high performance. According to different water quality conditions, the electrode material which is good for ion adsorption in solution should be studied. The application of this low-energy water purification technology in real life has become a new research hotspot.
Study on seepage characteristics of Cr3+ polymer gel and its mechanism-taken M oilfield in Changqing as an example
Authors: Yang Haien , He Zhiwu , Ren Jianke , Zheng Lijun , Lu Xiangguo , Cao Weijia , Kuai Jingwen
Published: December 2019

Cr3+ polymer gel has strong salt tolerance, retention capacity and reservoir adaptability. This technology has obtained a significant effect of oil increasing, and the economic benefits was good. In order to meet the demand of improving oil recovery of M oilfield in Changqing, Seepage characteristics of Cr3+ polymer gel and its mechanism were carried out. Results showed that when the polymer concentration of polymer and Cr3+ polymer gel were the same, viscosity and molecules aggregates diameter of them were basic the same, but the resistance coefficient and residual resistance coefficient of Cr3+ polymer gel was larger. It could be explained that the retention ability of Cr3+ polymer gel was stronger. With the increase of relative molecular weight of polymer, the resistance coefficient and residual resistance coefficient of polymer and polymer gel also increased. When core permeability increased, the resistance coefficient and residual resistance coefficient decreased. Compared with polymer solution, Cr3+ polymer gel had higher resistance coefficient and residual resistance coefficient, and residual resistance coefficient was larger than resistance coefficient. The mechanism study showed that water dilution in subsequent water flooding stage would cause molecular chain expansion in polymer gel, which caused the diameter of polymer gel molecular aggregates and retention in pores increasing.
Study on the Property and Mix Ratio of CA and L•SAC Recycled Aggregate Planted Concrete
Authors: Chen Jianguo , Jiang Tao , Li Ruoyu , Wu Guangjun , Lifang Tiancheng
Published: December 2019

This paper studies the influence of different water-cement ratio configuration of recycled aggregate planted concrete on performance, the permeable property and drying shrinkage and the influence of different gelled material against compressive strength. At last, the plant growth performance of the planted concrete is analyzed through the whole process of screening, seeding and long-potential recording of the plants. It is found that the compressive strength of CA-R (recycled aggregate aluminate cement concrete) and L•SAC-R (recycled aggregate have low alkalinity) is higher, which is 7.6 MPa and 7.4MPa, respectively. Compared with the natural aggregate, the against compressive strength of the recycled aggregate is much smaller, and the difference of the experiment blocks with different age conditions is not large; It is better to set the porosity of the planted concrete between 22% and 35%: On the one hand, the total porosity of the recycled aggregate planted concrete is always slightly higher than that of the natural aggregate planted concrete, which is basically maintained at 31.7% and slightly higher than the design value; On the other hand, the total porosity of CA-R is larger than that of L•SAC-R and P•O-R (recycled aggregate ordinary Portland cement concrete), and compared with the total porosity, the variation of connected porosity is not obvious. In addition, the water permeation coefficient of 20-40mm single-stage concrete is between 15-19mm/s; And the dry shrinkage of aluminate recycled aggregate planted concrete is larger, there are different degrees of cracks on the surface and aggregate bonding. Among the three plants selected during the experiment, Festuca arundinacea and Alfalfa had good adaptability, but Bermuda grass had low adaptability.
Comparative study on ozone oxidation chemiluminescence method and classical alkaline potassium permanganate method for determination of chemical oxygen demand in seawater
Authors: Wang Zhaoyu , Wang Wei , Gao Yang , Lv Hongmin , Zhang Yanmin , Liu Yan , Ma Ya , Zhang Yingying , Chu Dongzhi
Published: December 2019

Seawater in the coastal waters of Qingdao, China was collected, and COD was measured by ozone oxidation chemiluminescence method and alkaline potassium permanganate method which was adopted in China as the standard method for measuring COD in seawater, respectively. The results show that when COD was less than 1 mg/L, the absolute error of ozone oxidation chemiluminescence method was less than 0.1 mg/L, and when COD was more than 1 mg/L, the relative error was less than 10%. The relative standard deviation of ozone oxidation chemiluminescence method was lower than 5%, and the detection limit was 0.0022 mg/L. The results of ozone oxidation chemiluminescence method were close to those of alkaline potassium permanganate method. With higher precision, lower detection limit, faster measurement, and online measurement, ozone oxidation chemiluminescence method is an ideal monitoring method for COD in seawater in the field.
Optimization of capacity of CCHP system coupled with solar and biomass energy
Authors: Yizhou Wang , Hao Feng
Published: December 2019

The CCHP system uses renewable energy to meet the heating, cooling and power loads, improve primary energy efficiency, and reduce carbon emissions. In this paper, a biomass energy-driven and solar collector-assisted CCHP system is proposed. The mathematical model of the system is achieved. And capacity was optimized by a genetic algorithm. Further, a building in Urumqi as an example, the feasibility of the system was verified by genetic algorithm. The results demonstrate that the values of primary energy saving ratio, annual total cost saving rate and carbon emission reduction ratio are 20.94%, 11.73% and 40.79%, respectively. This finding could provide a reference for biomass energy-driven and solar collector-assisted CCHP system design for buildings in the Urumqi plateau.
An Approach for Analyzing the Dynamic Strength Increment of Concrete Material
Authors: Xu Peibao , Ge Dali , Zhao Jun , Yu Yong , Li Kai
Published: December 2019

The Split Hopkinson Pressure Bar (SHPB) is usually used to get the dynamic compressive strength of concrete materials at strain-rate between 101 and 103s−1. It is widely accepted that the main influencing factors of dynamic strength include strain-rate effect and inertial effect in SHPB tests, which result in obvious scattered phenomenon existing in the test data. However, many empirical formulae of dynamic increase factor were directly obtained from the scattered test data to describe the material properties, which has been overestimated strain-rate effect for design analysis. In present paper, numerical simulations with a rate-independent material model are used to study this pseudo-strain-rate sensitive phenomenon because it is very difficult to quantify these influences by conducting laboratory tests. Then a unified approach for processing the scattered test data of normal concrete is available especially for mid-high strain rate. Moreover, the quantitative relations among the strain-rate effect, inertial effect and calibration test data have been obtained with the help of the corresponding numerical simulations, and semi-empirical formulae are also proposed to describe the inertial effect and strain-rate effect.
The effect of engineering parameters on production capacity of a fractured horizontal well in tight oil reservoirs
Authors: Fan Yang , Qiquan Ran , Junlong Zhao , Guanzhong Shen , Yijing Feng , Mengya Xu , Jiaxin Dong , Lifeng Liu , Suqi Huang
Published: December 2019

Terrestrial tight oil in China has the characteristics of poor reservoir properties and strong heterogeneity. Large-scale volumetric fracturing of horizontal wells is one of the few solutions to achieve economic exploitation. Horizontal well productivity after fracturing is affected by many complex factors. Therefore, by using the numerical simulation method, the ellipsoidal fracture network containing the major fracture and the minor fracture is designed by the method of locally densifying grids to simulate the productivity of a single well of the tight reservoir of Changqing Oilfield and analyse the affecting factors on the productivity. The results show the horizontal well productivity increases with the length of the horizontal section, the number of fractured stages, the volume of SRV, and the complexity of the fracture network, but the increment gradually decreases. The orthogonal test method was used to rank the influencing degree of engineering parameters on productivity. It was found that the influencing degree of fractured horizontal well productivity in tight oil reservoirs was decreasing from SRV volume, fractured stages, the complexity of fracture network to the length of horizontal section.
Electromagnetic Interference Diagnosis Based on HPLC Timing Sequence Topology and Machine Learning
Authors: Tian Haojie , Zhao Yudong , Kang Liyan , Shang Ying , Liu Xinran
Published: December 2019

High power line communication (HPLC) has become a basic communication method in the courts of smart grid areas. Some special electrical equipment in these power grid areas may cause electromagnetic interference, which will undermine the stability of HPLC, and lead the acquisition equipment in the smart grid to miss out or lose control. Consequently, the power supply quality and grid safety will be affected. This kind of influence is temporary, random, and self-recoverable, and it is difficult to be identified and eliminated through on-site inspection. In this paper, the HPLC network topology records of the courts are analyzed, the HPLC timing sequence topology is fitted, and user information and electricity consumption information are correlated. Machine learning and optimization are carried out on the data of the courts by using the association rule learning and decision tree algorithm. It is found that the machine learning method based on the HPLC timing sequence topology can effectively realize the electromagnetic interference positioning of the power grid in the courts, and help the on-site operation and maintenance personnel to conduct troubleshooting.
Deep Perception of Power Failure of Substation Area in Smart Grid
Authors: Kang Liyan , Shang Ying , Sun Lina , Li Zhongcheng , Zhang Muxin
Published: December 2019

Power failure of substation areas is a regional power failure event. It is difficult to judge whether or not the failure occurs in the substation area from the status of a single equipment. Moreover, the local network is interrupted after the power failure of substation area, and the power grid equipment is disconnected, so the information of the substation area cannot be perceived. Build high-speed communication network of substation area in smart grid, increase emergency power supply function of equipment of substation area, strengthen the perception ability of equipment status of substation area, introduce data mining analysis method to deal with massive perception data, and strengthen the processing ability of perception information to form deep perception of power failure in substation areas, which make it possible to fast, accurately and completely judge the power failure of substation area. Unexpected power failure or manual-drive power failure of substation can be used to support power grid construction and disaster prevention.
Design of unmanned aerial vehicle mobile hydrogen refueling station
Authors: Li Gendi , Wang Kuisheng , Liu Yong , Zhou Junbo
Published: December 2019

Traditional unmanned aerial vehicle (UAV) that uses lithium batteries as a power source which limits UAV’s performance and application due to their short flying time. New UAVs which use hydrogen fuel cell as its power have longer flying time up to three times of traditional ones. The UAV mobile hydrogen refueling station has solved the problem of UAV’s energy, and it is a device that provides hydrogen as the power for a hydrogen fuel cell UAV. The process flow of the UAV mobile hydrogen refueling station is introduced. The way of pressurization has been innovated, and the pressurization process has been tested. The result shows that, increasing the pressure of the compressed gas and the inlet hydrogen can increase the output hydrogen flow. Meanwhile, in order to avoid pneumatic booster pump operating under high load for a long time, compressed gas pressure and inlet hydrogen pressure should also be properly controlled within a stable range. It has a certain guiding significance for the design of mobile hydrogen refueling station.
A step size control scheme based on polynomial regression for continuation power flow calculation
Authors: Sun Hua , Chen Quan , Dong Xiaoming
Published: December 2019

Continuation power flow is an effective approach to analyse static voltage stability by accurately calculating the maximum loading point. To improve the efficiency of continuation power flow model by decreasing its calculation burden, a new step size control scheme for predictor-corrector steps is proposed in this study. Firstly, the predictor tangent vector is obtained according to Jacobin matrix. Secondly, the optimal parameter with the largest sensitivity to load power change is identified by recognizing biggest component in tangent predictor vector. Thirdly, polynomial regression between the optimal parameter and the power increment parameter is analysed. Finally, the improved self-adaption step size control scheme is established in terms of the obtained polynomial regression model. Studies based 14-bus test system are used to demonstrate the efficacy of the proposed scheme. For this study, specific point-to-point maximum loading is calculated.
The Kazakh terminology recognition system in the IT field
Authors: Niyazbek Muheyat , Talp Kuenssaule
Published: December 2019

The design and development of the Kazakh language terminology recognition platform in IT field is one of the important means for more effective use of term resources in the field. Used a conditional random field (CRF) and manual modification method in the platform and based on the characteristics of the Kazakh language itself, this paper analyzes the rules of terminology formation and related terminology identification methods as well as describes the basic framework of the term recognition platform and the workflow and main functions of the training corpus, terminology recognition, feature template and term extraction in the system.
Optimum Design of Coil Disc Magnetic Field of Rapid Repulsion Mechanism
Authors: Yang Liu , Xu Cheng , Haiyang Zhao
Published: December 2019

The electromagnetic repulsion mechanism (ERM) based on the principle of eddy current repulsion has been widely applied in DC circuit breakers, but its energy conversion efficiency is low. In order to design a high-efficiency ERM, this paper establishes a simulation model of the ERM with double coil structure by the finite element analysis method. The coil disc skeleton is analyzed and optimized from the aspects of magnetic conductive material and structure. The problems of magnetic saturation and power loss are avoided, and the optimum design parameters of magnetic conductive components of coil disc are obtained. The simulation results show that the magnetic conductive material should be made of silicon steel sheet and designed into an E-2 type. Compared with the hollow double-coil repulsion mechanism, the electromagnetic repulsion peak value increases by 10.6%, the maximum opening speed increases by 25.3%, and the driving efficiency increases by 41.6%. The travel distance of 12mm can move within 1.8ms, providing a reference for the design of high-speed and high-efficiency ERM.
Research on target damage evaluation model based on image with single source information
Authors: Xiaonan Zhang , Qiang Huang , Xueyang Bai , Zhidan Sun , Gao Li
Published: December 2019

Under the condition of single source information, this paper studies and analyzes the target damage evaluation model based on image information, and proposes an automatic evaluation algorithm based on image change detection based on the analysis of geometric features and texture features before and after the target is hit. The algorithm consists of two parts: image extraction algorithm and image matching algorithm. For the image extraction algorithm, the image gradient, the definition of corner point and the structure feature and the extraction technology of the corner point are introduced in detail. For image matching algorithm, we mainly consider gray-based matching algorithm and feature-based matching algorithm. Under the condition of single information source, the target damage model based on image information is helpful to make up the deficiency of damage evaluation model, which has certain practical significance.
Analysis of lava flood risk distribution to support hazard mitigation
Authors: Hariyanto T , Larasati Z R , Kurniawan A , Pribadi C B
Published: December 2019

Flood lava is a collection of lava released by the volcano and reaches the lower surface with the help or encouragement of rainwater. The impact of lava flooding has a high risk because the material it carries can cause damage and potentially cause death, injury, illness, life threatened, loss of security, displacement, damage or loss of property, and disruption of community activities. Mapping the risk areas for lahar floods by utilizing the Geographic Information System (GIS) can be useful to support disaster mitigation activities. The lahar flood risk map was generated from an overlay of the lahar flood hazard map, lava flood kerawana map, lava flood vulnerability map, and lava flood capacity map which had each parameter which was then calculated using the scoring method and classified based on its scoring value. From the results of processing, the lahar flood risk map can be classified into 3 classes, namely high risk, moderate risk, and low risk. High risk occurred in November, mostly occurred in the Pasirian District area, especially in the area around the river and a little in the river area Pronojiwo District, with a total area of risk area is 28.983 or with a percentage of 4.24% of the total area of the study area, and areas that have risks high in January many occurred in the Pasirian District area, especially in the area around the river with a total area of risk area is 9.570 or with a percentage of 1.40% of the total area of research.
Landslides hazards assessment using geographic information system and remote sensing: Gakenke District
Authors: Benineza G G , Rwabudandi I , Nyiransabimana M J
Published: December 2019

Gakenke district is located in the Northern Province of Rwanda and is known as the district with several landslide events. Assessment of landslide in Rwanda has not been a problem until the weather changed frequently with heavy rainy season. The purpose of conducting this study was due to massive movement of earth having impacts on roads infrastructures, community, and negative impacts for the planners and decision makers. Remote sensing and Geographical Information system methods were used in the study for the assessment of landslide hazard occurrence, weighted overlay model was used where the different triggering factors were considered and scored according to the relationship between causative factor contribution the and landslides and then weighted for producing landslides vulnerability map. The results revealed that Gakenke is vulnerable to landslides and this is due to the most triggering factors: slope that present 40% with 30% of the land cover in addition to rainfall having 20% and 10% of Gakenke District soil type of this area. Landslide hazard map of Gakenke have been created using GIS by combining the causing factors. Hence, an updated map of exposed areas in Gakenke District to landslide could be prepared taking into account different points
Cut and fill analysis of Palu Bay seabed topography pre and post-tsunami
Authors: Khomsin  , Pratomo D G , Susanto L O F
Published: December 2019

Palu Bay is an earthquake-prone area, in September 2018 tectonic earthquake occurred in Donggala District, Central Sulawesi, which caused tsunami due to underwater landslides. One of the impacts caused by the tsunami was changes in bathymetry. In tsunami post-disaster reconstruction, further studies regarding seafloor topography information of affected areas are needed. This study examines and analyzes the underwater landslide in Wani, Palu Bay 2018 before and after the underwater landslide using bathymetry, and coastline data to determine cut and fill volume. The analysis was conducted on the three components: contouring, slope/gradient, and volumetric (cut and fill). The contouring results show significant depth changes at the 200-meter contour on Tanjung Labuan, Palu. The volume calculation from two surfaces shows 59,512,720.790 m3 cut and 12,466,252.630 m3 fills in the landslide area.
Vegetation Health Index (VHI) analysis during drought season in Brantas Watershed
Authors: Masitoh F , Rusydi A N
Published: December 2019

The Brantas Watershed located in East Java has the vulnerability of drought as one of hydrometeorological disasters. The Vegetation Health Index (VHI) as one of remote sensing index was used to analyse drought. VHI can be derived based on both the Land Temperature Surface (LST) and Normalized Differenced Vegetation Index (NDVI). This research aimed to determine the influence of LST and NDVI, respectively, to VHI, especially in dry season of 2008 - 2017. The data used were MODIS Vegetation Indices (MOD13A1) and MODIS Land Surface Temperature (MOD11B1). The influence of LST and NDVI to VHI in the Brantas Watershed was analysed using correlation and regression testing. The LST - NDVI correlation of Brantas Watershed was negative (-0.73). The high temperature distribution was dominantly located in the low-density vegetation areas. The LST - VHI correlation was 0.35, and NDVI - VHI correlation was 0.63. This illustrated that the influence of land surface temperature to the vegetation drought was weak. Drought indicated by VHI was more likely to be influenced by internal conditions of vegetation and other environmental elements.
A framework: Implementation of smart city concept towards evacuation route mapping in disaster management system
Authors: Nurwatik  , Hong J H
Published: December 2019

Due to the complex nature of disaster, elaborating smart city environment has being important matter in term of enhancing the resilience, awareness and preparedness. Therefore, this research propose a collaborative framework of disaster awareness system that can integrate multiple data resources in smart city ecosystem. The system architecture consist of four tiers; (1) sensor tier, which is responsible for retrieving and updating information about reality from sensors; (2) database tier, which is responsible for collecting information from related domain resources (3) decision support tier, with respect to examine the continuously updated situations for making emergency decision; and (4) alert tier, which is responsible for informing and warning citizens who living within risk area. By using earthquake impact assessment of Taiwan earthquake, the framework is built in knowledge to evaluate service area of hospital and provide evacuation route using network analyst. From infrastructure perspective, standards are introduced to resolve the various heterogeneity issues between different stakeholders. The result of hospital service area analysis is 1207 km2 and decreases about 474.5 km2 after the earthquake. Moreover, the comparison of route analysis between before and after earthquake indicates that the implementation of smart city concept and network analyst sussessfully minimize travel time until 10 minutes.
Vertical deformation analysis in Banda Arc deduced from GPS time series data 2008-2013
Authors: Rahmadani S , Meilano I , Sarsito D A , Susilo
Published: December 2019

Banda arc is a product of complex interactions between the Eurasian, Australian, Pacific and Philippine Sea plates. As a result of this tectonic interaction, the Banda arc has undergone significant deformation of the crust, both in the horizontal and vertical directions. In this study, we performed a time-series data analysis of displacement in vertical components. A total of 16 permanents GPS observations from 2008 to 2013 were collected and analysed in this study. The GPS sites spread around the Banda arc area from Bali island in the south to Ambon in the north. This is the first research on vertical deformation analysis carried out in this area. The results of this study show that 3 GPS sites experience a subsidence, which are BANI, CAMB and CTOA, while the 13 others experience an uplift mechanism. The spatial pattern of vertical deformation obtained from this research will provide insight about tectonic conditions and can then be used as a basis for conducting seismic hazard analysis in the Banda arc.
Calculation of the number of peaks in The Gunung Sewu area using DEMNAS, focal maximum function and slope position classification method
Authors: Sutanta H , Tiera A
Published: December 2019

Thousand Hills (Gunung Sewu) is a karst area in the southern Java island, stretches 85 km east to west covering around 1,300 km2 and formed by thousands of conical hills. This research aims to calculate the number of peaks in the Gunung Sewu area using focal maximum function and slope position classification. The data for the calculation was the Indonesian national DEM (DEMNAS). It was used in its original spatial resolution at 8.25 m, and the resampled version at 10 m and 16.5 m. The processing consists of detection of peaks, selection of top of hills, and evaluation. Twenty four combinations of window types and size and spatial resolution of DEMNAS were evaluated. The accuracy of the calculation was assessed using ten test areas with 1,576 hills digitized manually. The best function to detect the peaks is a rectangle type window with a width of three pixels with a spatial resolution at 8.25 m. Types of hills can be identified: conical and polygonal hills. The calculation found that there are 27,773 regional peaks, or hills, in the Thousand Hills area. The results were tested using a confusion matrix with overall accuracy is 86.2%.
Mapping the distribution network of a government non-cash food assistance in Kulon Progo Regency using geospatial information system
Authors: Sutanta H , Wulandari M D
Published: December 2019

Indonesia government provides non-cash food assistance to people. Every household gets rice and egg in the equivalent of IDR 110,000 per month. In Kulon Progo Regency, the number of recipients amounted to around 53,000 households. Rice and eggs to be distributed should come from local farmers and breeders. The delivery is conducted by e-Warong, a community-owned small kiosk. However, the location of rice supplier and e-Warong have not been known. This paper aims to describe the mapping of these parties and analyze their spatial implication. The following geospatial data: administrative boundary, road network, and digital elevation model (DEM). List of recipients, e-Warong and Gapoktan were provided by the Social Agency of Kulon Progo Regency. Mobile Topographer apps were used to map the location of 13 rice suppliers, 111 e-Warongs, and parts of household recipients. Egg suppliers are not mapped because for each month each E-Warong can change suppliers, adjusting the availability of eggs. They were processed using spatial analysis operation. The result is maps of the distribution network and service area. Spatially and visually, the inequality of the distribution network is evident. This inequality is caused by distance and topography, factors that were not visible in the textual data currently in used. Where the E-Warong area in the northern part of the district is a plateau or hilly which makes mobility more difficult than E-Warong in the southern part which is a lowland. GIS has been used to create maps of the distribution network in visually attractive and spatially descriptive models.
Local Wisdom in Malay Kampung Semarang as Representatives of Smart Environment
Authors: Kurniawati W , Mussadun  , Suwandono D , Islamey T Z
Published: December 2019

One of the smart city indicators is a smart environment. Smart environment is a setting which can be a catalyst for its citizens, support them to be aware of a local engagement in managing their existing natural resources. The local engagement is not only shaped by formal strategies, but also by local wisdom. Local wisdom is a community understanding that is used as a reference in daily life activities. Based on its history, the Malay Kampong (Kampung Melayu) Semarang which was formed in 1743 has strong local wisdom as a basis for arranging the district. Settlement patterns based on ethnicity and culture, building patterns that are sensitive to the floods and tidal ranges, multicultural-based district, make this region able to survive hundreds of years to maintain its existence and can be a representation of the smart multicultural environment in Semarang. The current environmental degradation in this area is the basis for the research. Is local wisdom still maintained here? Or is there a shifting meaning of local wisdom at this time? This study aims to explore the role of local wisdom of Malay Kampung Semarang as a representation of a smart environment. This study combines quantitative and qualitative approaches. To achieve this goal, it is necessary to identify the influence of local wisdom in Malay Kampung Semarang on flood resilience and tidal. The analysis of the smart environment model is based on the interaction of wisdom and influence on the district arrangement. The result of the study shows that local wisdom is an effort to improve the living place to be more sustainable in the event of flooding and tidal. Efforts made to elevate the floor of the building, height of buildings, elevate the street, build houses with a stage model, and make the second floor of the house represent a smart environment in the form of sustainable urban planning in the Malay Kampung Semarang.
Basic Framework of Regional Model for Disaster Waste Estimation and Distribution by Using Spatial Approach in Central Java-Indonesia
Authors: Maryono M , Seruningtyas K , Roynaldi A D , Sudarno  , Hadiyanto
Published: December 2019

Disaster are becoming more frequent around the world and more intense in urban areas. Central Java is the province with the largest number of disasters in Indonesia. Disaster create amount of disaster waste and sometime very huge, many times comparing to daily municipal waste generation. Government and local citizen sometimes are unable to handling disaster waste. Since effective implementation of disaster waste management (DWM) will lead quick and better recovery of living and avoid more environmental risk, high level regional government such as provincial should help. To make effective support, it is important that provincial government develop a model to monitor disaster waste generation in each regency and cities. This study aims to develop basic framework of regional model for disaster waste estimation and distribution in provincial level. This study used Central Java Province as a case study. To estimate disaster waste in Central Java, this study developed an index system as a basic model. It is about basic comparison of disaster waste generation in all central java regencies or cities. Disaster waste is associated with total disaster events. This study utilized GIS tools to express model and system. This study developed of regional model disaster waste estimation in Central Java, divided by 3 sub decades. Study result shown that in first decade 1990-1999 the highest index of disaster waste estimation is Brebes Regency. Second decade 2000-2009 the highest index of disaster waste estimation is Semarang Regency and the third decade 2010-2018 the highest index of disaster waste estimation in Cilacap Regency.