bluuebunny/crossref_metadata_2025 huggingface dataset:
Water management model in Bodri River Basin, Province of Central Java
Authors: Purnama I L S
Published: March 2020

Basically, in the tropics there are three sources of water, namely rainwater, surface water (river and lake water), and groundwater. From the existing water sources, almost all human daily water needs, such as drinking, bathing and washing, are sourced from groundwater. Uncontrolled extraction of groundwater can cause a variety of consequences on the environment, such as groundwater degradation, seawater intrusion and even land subsidence. Groundwater management efforts need to be carried out so that availability is maintained. The first step in this effort is to formulate a management model as a basis for determining policy. For this reason a dynamic modeling simulation is carried out using the Powersim 2,5c Program. The results showed that the priority of groundwater management efforts in the Bodri River Basin was to reduce groundwater use for the domestic sector which could be done through reducing the rate of population growth and saving groundwater use. Another result of this study is that the recharge of groundwater in the Bodri River Basin is relatively low, so efforts to find alternative sources of water other than groundwater need to be considered.
Visibility Estimation Due To Forest Fire Smoke Using Backward Elimination Multiple Regression of Himawari_8 Satellite Data over Sumatera and Borneo Island Indonesia
Authors: Ismanto H , Hartono H , Marfai M A
Published: March 2020

Land and forest fires smoke has been regularly revealed over Sumatera and Borneo Islands for past two decades. Various sector have been severely impacted, including air transportation. Air obscurity caused by smoke reduce horizontal visibility and profoundly affects aviation regularity, efficiency and safety. The study aimed to develop a visibility estimation of an orbital satellite using remote sensing and observation data. Orbital satellite is one of the technological advances that have potentials for supporting and improving the ability of meteorological service provider to meet user’s needs related to adverse weather. The Automatic smoke detection using classification tree analysis was used as the first step. Then backward elimination for multiple regression was used to produce visibility estimation based on Himawari_8 satellite-smoke-detection and actual observation of visibility in airports. The results showed that the correlation between the estimated visibility in satellite-detected smoke and observed visibility was high (R2=0.68). This approach very sensitive to thick smoke with horizontal visibility of shorter than 2000 meters.
Evaluation of soil characteristics and infiltration capacity under Dimocarpus Longan Fruit-tree based agroforestry in Selopamioro, Imogiri, Bantul, D.I.Yogyakarta
Authors: Sagung Esya Maharani A A , Ngadisih  , Tirtalistyani R , Mawardi M , Alviandy D , Rahmadi N A
Published: March 2020

Selopamioro village in Imogiri sub district, Bantul-D.I. Yogyakarta is located along southern mountains of Java. Nowadays, this village is developing agro-ecotourism through fruit-tree based agroforestry for improving household economy while keeping environment of hilly areas. The main objective of this study was to explore and evaluate physical characteristic of soil and infiltration capacity under Dimocarpus longan fruit-tree based agroforestry in Selopamioro village. Total area of Dimocarpus longan fruit-tree based agroforestry is 0,48 hectare with total 52 trees. The soil characteristics were focused on bulk density (ρb), particle density (ρs), porosity, textures, structure, soil moisture, content of organic material (COM), and lime content. The empirical models of infiltration, Kostiakov, was adopted to define soil infiltration capacity. The measurement of infiltration rate in the field was carried out by using Double-ring Infiltrometer method. The soil sampling and infiltration measurement were conducted in three different characteristics of slope, i.e., upper, middle, and lower slopes. The soils were taken from three points and two depth (0-40 cm and > 40 cm) per slope category, whereas the infiltration test was conducted solely in each points of slopes. A regression and correlations method were applied to evaluate the soil characteristics and infiltration capacity. The slope of upper, middle, and lower in Dimocarpus longan land were 30°, 17°, and 39° respectively. The Dimocarpus longan fruit-tree based agroforestry in middle slope was mixed with rainfed rice, the lower was nuts, while the upper slope was dominated by weeds. The soil was characterized as clay, sub angular blocky structure, bulk density (ρb) 1,26-1,46 gr/cm3, particle density (ρs) 2,04-2,10 gr/cm3, porosity 28-40%, soil moisture 36,90-42,00%mass, COM 1,16-1,78%, and lime content 2,69-3,46%. The average of infiltration capacity was 265,10 mm/hours which classified as very fast categories. The strongest relation between physical characteristic of soil and the infiltration capacity was owned by the soil textures. It had correlation coefficient -0,621, while the water content 0,883.
The comparison of rainfall intensity analysis methods in upstream area of Belik Watershed, Yogyakarta
Authors: Munawaroh N , Puspitasari N N A , Hadi M P , Suarma U
Published: March 2020

Belik Watershed is one of a catchment which located in urbanized area of Yogyakarta. The upper stream part of this watershed have very important role as recharge area. However, vast land conversion occurrence in Sleman Regency threatened its function and cause several inundation case within the area. In other words, stream capacity unable to accommodate the surface runoff. This research intend to analyzed rainfall return period and compare rainfall intensity analysis methods to be implement in the research area. Furthermore, statistical analysis performed to carry out suitable method in the previous research aims. The comparison of rainfall intensity analysis in the short time series distance utilizes Talbot Method and Sherman Method. Rainfall data of short times series distance obtained from Automatic Water Rainfall (ARR). This Calculations of the standard deviatiornesearch analyse 2, 5, 10, 25 and 50 years of return period. Calculations of the standard deviation and error square mean root peak-weight (PWRMSE) determine to choose which method has a better result. The design of rainfall intensity result shown in the Intensity-Duration-Frequency (IDF) graph. Based on the calculation, the most appropriate method is the Sherman Method with standard deviation and PWRMSE for each return period in chronological order of 2 years (-0.27) (Z 3.52); 5 years (-0.67) (Z 3.83); 10 years (0.3) (Z 5.39); 25 years (0.6) (Z 7.56); and 50 years (-1.0) (Z 9.72).
Low amplitude of streambank erosion: distinguishing mass and surface fluvial erosions
Authors: Sutarto T E , Papanicolaou A N T , Wilson C G
Published: March 2020

The purposes of this manuscript are in two folds e.g.: first, to promote two novel techniques using field-laboratory protocols, each for quantifying surface and mass fluvial erosion, second, to capture and highlight the regime change in the mode of bank erosion from surface to mass fluvial erosion based on real monitoring and measurements on a streambank face. In this study, conduit erosion flume and Photo Electronic Erosion Pin (PEEP) sensor technique were used for monitoring and measuring surface and mass fluvial erosions, respectively. Using those techniques the τ

c,sf
and τ

c,mf
, two key parameters which determine the onset of surface and mass fluvial erosion, can be determined successfully. The PEEP sensor can measure the mass fluvial erosion occurred under water, even capture the quasi-continues nature of erosion. More importantly, using these two methods, the presence of two regimes in the low amplitude of bank erosion, e.g. surface fluvial erosion and mass fluvial erosion can be captured. Starting from low to high shear stress, the onset of surface fluvial erosion as well as the transition from surface to mass fluvial erosion can be depicted.
Urban response towards tropical cyclone using twitter in Indonesia
Authors: Widyanarko U , Hizbaron D R
Published: March 2020

Tropical Cyclone Cempaka struck the southern coast of Java Island in November in 2017, causing floods and landslides in Yogyakarta, Wonogiri, Pacitan, Ponorogo, and the surrounding areas. These disasters devastated urban and rural areas and disrupted community livelihoods as they disconnected inter-city road access, flooded agricultural land, and damaged public facilities. During these hazardous events, many people actively left a “trace” on social media, especially Twitter. This research was designed to describe urban respond using Twitter during Tropical Cyclone Cempaka (TCC). The research data sources were tweets filtered with five keywords with geotagging. After the preprocessing stage, a total of 457 tweets were categorized as “urban” and “rural”. Then, the content was analyzed qualitatively by identifying the most frequently appearing words, the number of response (like, reply, and retweet), and the accounts mentioned on the tweets. The results showed that urban response to these catastrophic events was positive by posting words of prayer and sympathy, disseminating information for raising awareness of disasters, and organizing fundraising for the victims. Turned out that those able to respond was not mainly urban dwellers, there were many responds which based at rural areas. It was marked by similar words that mostly appeared in two comparative areas.
The Availability of Social Space in The Urban Yogyakarta, The Case Study of Umbulharjo District
Authors: Widiyastuti D , Ermawati H
Published: March 2020

Social interaction for the elders is one of the important activities as self-actualization in the community which can be done by involving themselves in various activities in the neighbourhood. The phenomenon of increasing elderly living in urban areas requires cities to be able to provide an environment which accommodates the physical limitations of the elderly. Yogyakarta City, which has an elderly population of 12.87% of its total, needed to provide comfortable facilities for the elderly as an effort to improve their quality of life. This study aimed to describe the elders’ social activities in Yogyakarta City and identify the facilities provided by the government to meet the needs of elderly activities. This study used primary data obtained through structured interview to the elderly and field observation. The results showed that most of the elderly’s social activities in Yogyakarta were carried out near their homes due to physical limitations. Most of the locations are public places within the housing area provided by the government such as the local citizen hall and public open space. The Yogyakarta city government needs to improve infrastructure to facilitate the elders’ activities, especially in certain area like river bank.
Development of Smelting Reduction Ironmaking Process
Authors: Zhou Xiaolei , Pu Song , Liu Ningbin
Published: March 2020

The production practice of COREX 3000 shows that COREX is a new type of ironmaking production method that has become mature in recent years. While achieving good environmental and social benefits, it also faces many problems. Production found that COREX 3000 has a high fuel cost and high production costs. Coal injection through the tuyere can effectively use the pulverized coal generated during transportation, reduce production costs, and obtain better economic benefits. During the COREX coal injection process, pulverized coal passes through the tuyere of the melter and gasifier and enters the swirling zone for combustion. Generate hot gas to meet the needs of metallurgical reactions. Unburned pulverized coal moves up, participates in metallurgical reactions, or stays somewhere. This has a certain effect on the melting gasifier.
Simulation Design of 30KHz Ultrasonic Rolling Tool Head
Authors: Yu Zexu , Song Jinchun , Wang Wenqiang
Published: March 2020

In order to explore the types of ultrasonic rolling tool head used in ultrasonic rolling and finishing processing device, ANSYS Workbench is taken as a tool to simulate the machining process of ultrasonic rolling processing through transient dynamic analysis, and the maximum residual stress distribution and stress concentration of 45 steel workpiece are analyzed. Based on the simulation result, the ball-type ultrasonic rolling tool head is selected in this work. In addition, the transient dynamics module of ANSYS Workbench is also used to simulate the ultrasonic rolling tool head of different structure parameter, in that way, the accurate and reasonable structure parameters of rolling components of ultrasonic rolling tool head can be achieved. The results of this work show that a ball-type ultrasonic rolling tool head of a diameter of 8mm can make the maximum residual stress minimum and stress concentration slightest under the condition of normal processing of the 45 steel workpiece. In other words, it suggests that this ultrasonic rolling tool head can produce the best surface quality of 45 steel workpiece.
Preparation of Antibacterial and Deodorizing composite regenerated cellulose fibers based on natural functional agents
Authors: Lv Cundong , Qiu Chunli , Yu Husheng
Published: March 2020

The regenerated cellulose fibers with antimicrobial and deodorizing functions were prepared by wet spinning process by blending the extract of Artemisia argyi and activated clay powder into the spinning solution. The mechanical properties and antimicrobial and deodorizing functions were tested. The results show that the breaking strength and breaking elongation rate of the composite fibers are slightly lower than those of ordinary cellulose fibers. The inhibition rate of Staphylococcus aureus, Escherichia coli and Candida albicans were 95%, 81% and 83% respectively, and the reduction rates of ammonia, acetic acid and isovaleric acid were 80%, 95% and 78%, respectively. It has excellent antimicrobial and deodorizing performance.
Liquid Exfoliation Process Optimization of Graphene-Like Molybdenum Disulfide with Orthogonal Experiment Method
Authors: Zhang Tianyun , Wang Haiqing , Zheng Xiaoping , Chen Kui
Published: March 2020

The values of process parameters have direct effect on the concentration and thickness of graphene-like molybdenum disulfide (MoS2) in dispersions during liquid exfoliation. For the purpose of optimization liquid exfoliation process of MoS2 and obtaining dispersions with concentration of MoS2 as high as possible, orthogonal experiment of 3 factors at 4 levels was determined by taking absorbance of absorption peak (located at 620 nm nearby) of graphene-like MoS2 in UV-Vis spectra as criteria for decision-making of quality. The results were further analyzed with range analysis method. The results indicate that, within given test range, the process parameters affecting absorbance, i.e. concentration of graphene-like MoS2, from high to low are 1,4-butanediol (BDO) content in BDO/water mixture, ultrasonic power and ultrasonic time, and the optimal process parameters of liquid exfoliation are BDO content being 80 vol%, ultrasonic power being 600 W and ultrasonic time being 40 h, which is further verified by additional test.
Experimental Study on Dairy waste water treatment by Photosynthetic bacteria
Authors: Wang Shuai , Yao Changhao , Jia Lianying , Yang Yang
Published: March 2020

Compared with the results of experiments,the effect of PSB on dairy waste water treatment and influencing factors were studied.The experimental results show that the removal efficiency of COD and BOD5 in dairy wastewater by PSB is much higher than the traditional methods.Under the anaerobic acidification-semi micro oxygen and semi-darkness conditions,the removal efficiency of COD is better than that under anaerobic light-illumination and aerobic darkness conditions. The optimal conditions are that the temperature is controlled between 15°C and 30°C,and the value of pH is 6.5-8.5, and the volume ration of wastewater and bacterial liquid is at 3:1,and DO in system is about 0.1-0.8mg/L.The stable water quality and higher removal efficiency of COD and BOD5 provide the basis for the further treatment of high concentration organic wastwater.
A Study on the Application of Natural Antioxidant Lignan in Boiled and Smoked and Boiled Sausages
Authors: Gao Qianqian , Wang Yingchen , Kuang Ming , Zhang Wenying
Published: March 2020

With fresh carp meat and black fungus as the main raw materials, black fungus and pork sausages with fish flavor and rich nutrition were made through reasonable processing based on the optimal process formula; the color, fat oxidation, odor, and rancidity of the product during storage were investigated after adding different amounts of natural antioxidant lignan; and the comparison with the blank control and analysis were carried out. The results show that the addition of 0.075% lignan had the best antioxidant effect. The TBA value and acid value of lignan-added sausages were significantly lower than those without lignan.
Transient numerical simulation on the surface deformation for GAE forming of plastic micro-pipe
Authors: Ren Zhong
Published: March 2020

To ascertain the mechanism of gas-assisted extrusion (GAE) deformation for the plastic micro-pipe (PMP), the transient simulation was done. The geometric model based on three phase fluids and finite element mesh were established. To get the converge solutions, the Crank-Nicolson integration, the interpolation method of elastic-viscous split-stress finite element method combined with streamline-upwind scheme were used. At the reasonable boundary and material conditions, the GAE forming of PMP for different gases flow rates were numerically studied. Moreover, the extrusion profiles of PMP under different transient times were also obtained. To explain the reason of surface deformation for the GAE forming of PMP, the radial and axial velocity, and stress difference of melt under larger gases flow rates at different transient times were all obtained. The transient numerical results can better interpret the mechanism of surface deformation of PMP.
Preparation of environmentally friendly chitooligosaccharide via enzymatic hydrolysis using response surface methodology
Authors: Xu Song , Xu Feng , Ma Yuqin , Rong Haiwu , Chen Xin
Published: March 2020

In this paper, chitooligosaccharide was prepared via the enzymatic hydrolysis of papain with chitosan as a raw material. The effects of pH, reaction time, temperature, and mass ratio of chitosan and enzyme on the product yield were analyzed. Single-factor and orthogonal experiments were used to determine the main factors affecting the reaction, and response surface methodology was used to optimize chitooligosaccharide preparation conditions. Optimum conditions were achieved at pH 4.50, with an enzymolysis time of 77.4 min, an enzymolysis temperature of 45 °C, a substrate concentration of 1.75% and an enzyme to chitosan weight ratio of 8.85. Under these conditions, the chitooligosaccharide yield reached 37.78%.
Experiments on loading capability of Inclined Suction Foundation
Authors: Huang Yiren , Ma Shili , Xie Liquan , Huang Wencai
Published: March 2020

Suction foundation, as a new type of marine anchoring foundation, has the advantages of reuse, fast construction, and large vertical bearing capacity. In this paper, through a self-developed bearing capacity test device, a series of load-bearing performance tests of the suction foundation are performed to reproduce the bearing characteristics of the suction foundation under the action of the pull-up load. It can be found that bearing capacity of suction foundation increases with the penetration, and the influence of the inclination angle on the bearing capacity of the suction foundation is in a middle value range.
Applied Research on Hinged Joint Damage Evaluation of Hollow Slab Bridge Based on Acceleration Amplitude Ratio
Authors: Shen Qiu , Kang Aihong , Xiao Peng , Gu Wan , Jin Dunjian , Chen Xin
Published: March 2020

With the increase of the operating life of domestic hollow slab bridges, a large number of in-service hollow slab bridges have different degrees of joint damage. In order to conduct a qualitative and quantitative evaluation of the different degrees of bridge joint damage, this article relies on the actual engineering background and studies different The dynamic response of a bridge with a hinge joint under the load of a car was determined. The joint failure location of the joint under simulated conditions was the beam end and the mid-span, and the damage levels were 25%, 50%, and 75%, respectively. Compared with relative displacement and relative opening and closing, the hinge joint disease has a greater influence on the acceleration of the beam plate on both sides of the hinge joint, and the acceleration response is the most sensitive. Therefore, this paper proposes a method to evaluate the degree of joint damage based on the acceleration amplitude ratio of the beams on both sides of the joint, which provides a new idea for the actual project to evaluate the degree of damage to the joint hinge.
Displacement-based Behavior Design Method for High-rise Seismic Isolation
Authors: Wang XiaoHuan
Published: March 2020

Based on the displacement-based behavior design method, this paper studies the high-rise isolation structure. Compared with ordinary low-rise buildings, high-rise buildings have more floors and longer periods. The elastic displacement angle and the elastic-plastic displacement angle are classified, the difference of the influence of bearing diameter and shape coefficient on the structural period is discussed, and the selection of isolation bearings is optimized considering the difficulties in the design of high-rise isolation structures.
Flexible flow deflectors against local scour at bridge piers
Authors: Li Huishu , Li Huang , Jin Peng , Yang Yuanping
Published: March 2020

In order to explore the potential application of flexible flow deflector in engineering, experiments were conducted to study the countermeasures against bridge pier protection. A three-deflector structure was proposed to improve the efficiency of reducing scouring depth at bridge piers, including one body and two wings. The performance of the proposed three-deflector structure was subjected to some preliminary laboratory tests, and satisfactory results were obtained.
Analysis of Influence of Different Parameters on Structural Stability of Beam String Beam
Authors: Yin Xunhua , Zhao Chao
Published: March 2020

The string beam structure is a new type of space structure, which satisfies the requirements of buildings for large spans, has good application value and broad application prospects. In this paper, the influence of the three-parameter ratio of the span, the prestress value and the number of strut on the stability of the beam string is studied. The modeling of the string member is carried out by SAP2000 software. The simulation results show that the arch structure of the stringed beam has the best stability when the span ratio is 0.25. When appropriate prestressing is applied to the structural cable, the stability of the structure will be significantly improved. The number of struts is not as good as possible. Considering the influence of the struts on the structure, choose the right amount.
Simulation Research on Passengers Behavior Evacuation Based on Future Humanized High-speed Railway Station Streamline Design
Authors: Cao Xianghong , Huang Mengxi , Wei Xiaoge , Chen Jibin
Published: March 2020

With the rapid economic growth and the continuous improvement of people’s living standards, people’s travel times and travel range is greatly improved. How to improve the efficiency of high-speed railway passenger station, to meet the passengers’ demands, to protect the public safety, to improve the comfort and other issues, has caused widespread concern of scholars. Based on the concept of future humanized railway station, the integrated streamline structure design of high-speed railway passenger station has been carried on, and crowd evacuation software has been used to simulate the way of passengers getting on and off. The results show that the integrated streamline design proposed in this paper is superior to the traditional design in structure and function, and can improve the utilization rate of high-speed railway station platform. The simulation of the best way to get on and off the train can save about 51 % of the station time. Time of passengers waiting and getting off the train has been greatly reduced which can effectively avoid the platform congestion caused by passenger travel safety. The integrated streamline design proposed in this paper can provide some references for the design of humanized railway station in the future.
Study on in-situ stress distribution in complex shale reservoirs
Authors: Du Zhenjing , Xu Yanchao , Yang Rui , Li Jing , Li Zhaochen
Published: March 2020

The shale reservoir in boxing depression has developed faults and fissures, and the distribution of in-situ stress is complex. Therefore, in this paper, studies on in- situ stress distribution of the shale reservoir in boxing depression based on the actual logging data, and maps the changes of in-situ stress and lateral pressure coefficient with the depth. The results show that the maximum horizontal principal stress in the study area is about 58∼67MPa. The minimum horizontal principal stress is about 55∼63MPa. The in-situ stress in the study area has a linear relationship with depth as a whole. The stress state accords with the relationship that the vertical principal stress is greater than the maximum horizontal principal stress is greater than the minimum horizontal principal stress. The coefficient of lateral pressure has a hyperbolic relation with depth. The research results can provide scientific basis for well pattern layout of oil and gas exploration and development in shale reservoir and reservoir reconstruction plan design.
Confirmation of Effective Influence Radius by Draining Boreholes in Fengcheng Mining Area
Authors: Jiang Wangang
Published: March 2020

In order to solve the problems of the drilling layout for preventing coal and gas outburst in Fengcheng mining area, using numerical simulation method to analysis the draining radius of the draining borehole, The law of stress and gas flowing around the draining boreholes was studied, meanwhile the draining radius were examined in site, the effective influence radius of draining borehole was determined in this mining area, the reasonable parameters and the important reference were provided for preventing local coal and gas outburst in the mine.
Genetic Algorithm PID Control of Solid Oxide Fuel Cell
Authors: Gu Jipeng , Wang Qianru , Lu Wenting
Published: March 2020

In this paper, a genetic algorithm PID controller is designed to control the output voltage of SOFC single battery. The genetic algorithm is adopted and designed to optimize the parameters of standard PID controller KP, KI and KD, so that the difficulties in parameters setting of PID are solved. The simulation results show that the designed genetic algorithm PID controller for the voltage of SOFC single battery can achieve certain and required accuracy as well as fast response speed.
Study on Similarity of Spur Gears Based on Dimensional Analysis Method
Authors: Zhu Chengli , Wang Xiaofang
Published: March 2020

In the process of gear development, bench test is an important and necessary method to study and exam the dynamic performance of the developed gears. But, it is very difficult to do bench test when the developed gear size is too big or too small. Such as for the big and heavy gears, it is not convenient to be moved and measured. And it will take a long time and consume much more materials and energy if we use the full-size gear to do bench test. On the other hand, too small gear size also makes the installation and measurements are very difficult in the bench test process. Sometimes, because of the unsuitable gear size, it is difficult to do bench test with the existing test equipment. Model test method can help us to solve this problem. Model test method allow us to scale-up or scale-down the size of the gear to get the similar gear model according to the similarity principle, and use it to do bench test instead of the full-size gear, and then apply the test results and rules of the model gear on the full-size gear. In order to do similar gear model test, the similar principle between the model and original gears must be established. In this paper, the similarity principle of spur gear was analysed in the respects of geometry, mechanics and kinematics with dimensional method based on the similarity theory. It provides a theoretical basis for gear model test method.
Dynamic surface control for nonlinear fractional-order chaotic systems with time delays
Authors: Cui Jiashuo , Xu Jing
Published: March 2020

Due to the uncertainty and randomness, the chaotic behavior of nonlinear system has become an important factor affecting the stability of the system. Therefore, it is very necessary to ensure that the nonlinear system has strong robustness against the external stochastic interference. This paper presents a new dynamic surface controller for nonlinear systems with time delays. In order to be closer to the actual engineering complex operation environment, the fractional calculus operator is added in the system. The dynamic surface control and time-delay effect is first applied to the second-order nonlinear fractional-order system. To deal with the problem of number explosion and time-delay in traditional inversion methods, a fractional-order filter and an alpha-order Pade approximation method are designed. After fully considering the tracking error, virtual control error and filtering error, the dynamic surface controller is established and its stability is verified. It can be seen from the simulation results that the system tracks the set function trajectory in finite time, and the controller has a good effect.
Simulation System of PMSM Based on Space Vector Pulse Width Modulation
Authors: Shi Jite , Ge Lixin , Li Changhong
Published: March 2020

This papper analyzes the mathematical model of PMSM, vector control strategy, the principle and implementation of SVPWM technology, on this basis, the simulation model of SVPWM and current velocity double closed-loop vector control system was built in MATLAB/Simulink, then the experiment’s results verify the feasibility of the design scheme. The design scheme of this paper provides a theoretical basis for PMSM vector control system in engineering practice.
Near space interceptor on-line correction research based on predictive intercept point
Authors: Chen Wenyu , Shao Lei , Chen Lulu , Tan Shili , Li Shijie
Published: March 2020

Aiming at the problem of large maneuvering range and difficult target detection of hypersonic target in the near space, according to the maneuvering range of predictive intercept point (PIP), this paper proposes a method to select different correction algorithms. First, The Gauss pseudospectral method is used to solve the trajectory optimization problem and the off-line optimal trajectory is generated. Then, aiming at the situation that the range of predictive intercept point is small, based on neighboring optimal control, the on-line correction method is used to find out the optimal trajectory near the off-line optimal trajectory. Finally, when the interceptor is located in a high airspace, aiming at the situation that the range of target motion is wide and the range of predictive intercept point is large, a direct force correction method based on velocity gain guidance is adopted. Simulation results verify the effectiveness of the proposed methods.
Dynamic Parameter Design Method and Application under a General Linear Relationship between Response Variables and Signal Factors
Authors: Yu Lanting , Zhang Yueyi , Zhu Hong , Mao Ting
Published: March 2020

In dynamic parameter design, there is often a different functional relationship between response variables and signal factors. SNR is an important tool for the parameter design of dynamic characteristics, and its estimation results change with the change of function relationships. This paper describes the dynamic parameter design method in a linear relationship between response variables and signal factors, and provides a case for verification. The results of this study are applicable to engineers and academics who need to conduct product design, process development and process optimization through dynamic parameter design.
Analysis of Synchronous Loop of Hydraulic Multi-cylinder Load of 60 MN Super Large Tonnage Compression shear tester
Authors: Liu Xishan , Li Yanmin , Wang Zhen , Zhuang Tianyu
Published: March 2020

In order to meet the mechanical properties testing requirements of super large tonnage bridge bearings, the 60 MN super large tonnage compression shear test equipment is specially developed. This article systematically carries out load analysis and machine working principle analysis, designs a four-cylinder synchronous control schematic diagram, adopts “master-slave control” position closed-loop feedback, adds force closed-loop feedback to improve system pressure stability, and uses AMESim simulation software to model and simulate actual operating conditions. Optimized control by using PID, the system obtains better displacement accuracy.
Motion control for an underactuated brachiation robot based on Lyapunov direct method
Authors: Liu Dasheng , Yan Guozheng
Published: March 2020

This paper studies a control strategy to drive a brachiation robot to realize the movement from an arbitrary initial posture to the desired target position imitating a gibbon to move from branch to branch. The main control aim is to drive an underactuated 2-DOF brachiation robot to reach the target in two action modes of swing motion and locomotion motion. Then, a brachiation motion controller is designed to consist of two control processes in which one is used to drive the brachiation robot to move from the suspend posture to the target position via a Lyapunov method, and the other is to ensure that the end of the link of the robot can reach the target bar through direction feedback control. Finally, some experimental results show that the control method can succeed to control a brachiation robot to achieve successfully the movement from one bar to another adjacent bar in two different cases.
Analysis of Influence of Nozzle Structure on Flow Field in Pulverized Coal Gasifier
Authors: Gao Xianbo , Yang Xiaoguang , Guo Fei , Lv Wenbo , Jiang Zhipeng , Jin Yingai
Published: March 2020

The three-dimensional model of the pulverized coal gasifier was established, and the internal flow field of the pulverized coal gasifier was simulated by CFD software. The variation of the velocity field and vector field inside the gasifier was observed when the angle of the guide vane in the nozzle structure gradually increased. Through the comparative analysis of the simulation results of the angle between the guide vane and the axis of 20°, 30°, 40° and 50°, the following conclusions can be drawn: as the angle of the guide vane increases, the lateral diffusion capacity of the airflow at the nozzle exit increases, and the longitudinal diffusion capability decreases. Therefore, after comprehensive consideration and contact with the actual gasifier size, this paper considers that the angle between the blade and the axis is optimally 40°-45°.
Topology Optimization Design of a 914 Mechanical Tee Based on SIMP
Authors: Peng He , Liu Huan , Yao Wenzeng , Zhang Shimin , Wang Yingying
Published: March 2020

A topology optimization design was created forthe key parts of the mechanical tee to find a solution to the challenge posed by its substantial weight and complicated local structure. In this paper, a SIMP algorithm is used as the theoretical basis for the topology optimization, and the numerical simulation was performed by Matlab. Furthermore, it was concluded that the filter radius and density penalty factor were the crucial criteria that affected the optimization result, allowing the relevant parameters of the optimization software to be adjusted. The topological optimization software was used to optimize the upper and lower shells of the mechanical tee, while the weight of the tee was reduced by about 20% without reduce in strength.
Development of Multi Micro Holes Synchronous Rotating and Vibration EDM Machine Tool
Authors: Mao Xiaowen , Yang Xuguang , Zhang Mingfang , Zhu Zhenjie , Huo Mengyou
Published: March 2020

In order to solve the problem of low efficiency of single electrode discharge machining, complex process and limited machining quality of group electrode array hole machining technology in traditional micro EDM machine tools, a multi-micro-hole synchronous rotating and vibration EDM machine tool was developed. The machine tool is composed of a mechanical platform and a control system. It can realize multi-electrode independent micro-energy pulse discharge, real-time detection of each electrode gap state and servo feed adjustment, and synchronous rotation assisted vibration of each electrode. The mechanical platform of the machine tool consists of servo feed mechanism, vibrating mechanism and multi-electrode synchronous rotating mechanism. The structure optimization and stability analysis are carried out by ANSYS finite element analysis software to ensure that the design of each part of the machine tool is reasonable and reliable. The control system is composed of motor control module, servo motion control module and pulse power module. It uses STM32F103RCT6 MCU to detect the machining state in real time and coordinate the work of each module, and uploading the processing data to upper computer. The Experimental tests show that the machine tool has high machining efficiency, stability and precision, and high degree of automation.
Compensation method of lever arm effect based on multi-accelerometers
Authors: Tan Qiangjun , Cheng Yongsheng , Tang Bin , Zhou Hao , Li Yinxin
Published: March 2020

In the wind tunnel model angle of attack test, the lever arm effect caused by the model vibration will greatly affect the attitude measurement accuracy. For the centrifugal acceleration term, there will be residual rectification errors using the low-pass filtering method; for the tangential acceleration, because of the same frequency as the attitude angle, the low-pass filtering method cannot filter it out. The mechanical compensation method will dramatically increase the compensation error of the tangential acceleration term due to the differential calculation. Aiming at the removal of the centrifugal acceleration term, this paper demonstrates that the error of the mechanical compensation method is far less than the low-pass filter method in the wind tunnel test environment. Aiming at the removal of the tangential acceleration term, this paper proposes a compensation method based on multi-accelerometers, which avoids the error amplification caused by differential calculation. Through theoretical derivation, analysis and simulation, the proposed method significantly improves the compensation accuracy of the lever arm effect.
Study on the Impact of New Urbanization on Land Intensive Use--A Case Study of Shaanxi Province
Authors: Liu Qiuman , Ma Yifan
Published: March 2020

As a national strategic implementation, new urbanization will inevitably change the disorderly urbanization in the past. Therefore, the problem of land intensive use in the new urbanization process is inevitably the top priority. Therefore, this paper analyzes the impact of the new urbanization of Shaanxi Province on land intensive use. The study found that: economic urbanization can promote land use efficiency; population urbanization will promote land input intensity; spatial urbanization can promote land use intensity and land use efficiency.
Evidence Verification Optimal Design and Practice of Electronic Health Card System Based on FSM
Authors: Zhang Heng , Ye Ziran , Xiao Bing , Huang He , Li Jian , Zhang Yaoyuan
Published: March 2020

With the health of China’s “Internet + medical" to facilitate the work of the people deepen, the National and Provincial Health Commission has also accelerated the “one card (code) connection" of the electronic health card, meanwhile, the empirical verification of the electronic health card is more important. The empirical verification of the electronic health card involves children, adults, including mainland Chinese residents, Hong Kong, Macao and Taiwan residents and foreigners. The verification logic is very complicated. This paper introduces the FSM technology, combined with the design mode of “micro service + application open platform + light application", optimizes the empirical verification of the traditional electronic health card management system, puts forward the development mode and five-tier architecture mode based on the FSM, and optimizes the existing empirical verification process of card issue and using. These measures have positive roles in promoting to achieve the mutual information of diagnosis and share treatment services across medical institutions.
Research on the Construction of Index System for the Influence of New Urbanization on Land Intensive Use
Authors: Liu Qiuman , Ma Yifan
Published: March 2020

Shaanxi province accounts for a quite significant status in the stategy for the development of the northwest,which as a bellwether in northwestern five provinces.Therefor,the development of Shaanxi province is of great siginificant in the development of the national.The new-type urbanization is inevitable different from the former,which as the formulation of national strategy and implementation.The problem of intensive land-use is widely concerned in the progress of new-type urbanization of Shaanxi province. Therefore, this paper uses scientific methods to establish an index system for new urbanization and land intensive use.
Research on Electricity Transmission and Distribution Price Calculation under Electricity Regulation
Authors: Ma Qian , Shi Jing , Li Bingjie , Fan Anjie , Cheng Chen , Wang Siyu , Chen Meng
Published: March 2020

The new round electricity system reform leads to changes in electricity supervisory environment. Further, the reform on electricity transmission and distribution price has new objective. Under such background, this paper establishes scientific and reasonable electricity transmission and distribution price calculation model, collects data and carries out electricity transmission and distribution pricing. Based on calculation results, this paper carries out parameter sensitivity analysis on electricity volume (uncertain regulatory parameters) and main regulating parameters, and gets sensitivity ranking of each pricing parameter of electricity transmission and distribution. Through study, the electricity transmission and distribution price calculation model and sensitivity analysis model for price influence factors under new electricity supervision are formed, providing ideas and opinions for electricity transmission and distribution price calculation.
Application of GA-DA-Elman Neural Network Algorithm to Urban Air Quality Evaluation
Authors: Liu Haiyan , Geng Xuan
Published: March 2020

In order to improve the accuracy of air quality assessment, this paper presents an Elman neural network model based on dragonfly genetic algorithm fusion optimization. This model used genetic algorithm to optimize the weight and threshold of Elman neural network, introduced dragonfly algorithm in the process of searching for the optimal chromosome set, and used the best dragonfly decoded to replace the worst chromosome, thus forming an improved GA-DA-Elman neural network algorithm. According to the data from the atmospheric environment monitoring of shanghai, the air quality evaluation models of Elman neural network and GA-Elman neural network were established and compared with GA-DA-Elman neural network. The results show that the GA-DA-Elman air quality evaluation model has the highest accuracy (95%), and the error control stability is optimal.
Research on the Method of Context Modeling Based on Ontology —— a Case Study of Tea Sales
Authors: Mao Zhanzhan
Published: March 2020

With the raise of the Belt and Road strategy and the development of ubiquitous computing, the cross-platform context data coming from the wireless network,mobile computing and sensor network is increasing rapidly. How to shield the distribution and heterogeneity of context information so that users and their context information can be understood by computers has become a hot topic in current research. This paper takes tea sales as the research object. By building an ontology-based context model, this paper explores the effectiveness of the modeling method in solving semantic interaction and information fusion, and then promotes the organic integration of cross-platform and cross-industry scenario information in the new era .
Analysis of crowd flow characteristics based on multi-space scale and multi-source data fusion
Authors: Zhao Rongyong , Wang Yan , Liu Qiong , Dong Daheng , Li Cuiling , Ma Yunlong
Published: March 2020

In the big data background, multi-source data fusion provides a very effective means for researchers to extract hidden and valuable information and knowledge from many heterogeneous data sources. Large-scale crowd movement is a complex process with big size of data coming from several sources such as safety risks of crowding and trampling in public places in the possible form of subways, railway stations, airports, tourist attractions, or large-scale exhibitions. The analysis of crowd flow characteristics among these high risk areas has also become a major research hotspot. Based on the multi-space scale concept and the available data source information, this paper proposes a technical framework of crowd flow characteristics analysis. Finally, a case study of crowd flow characteristics analysis is implemented to validate this technical freamwork. This study can provide a effective theoretical support and security warning for the public management department.
The Application of Time, Location and Narrative Elements in Information Graphic Design--Taking the Information Sorting on the Development Process of the Honeysuckle Pattern as an Example
Authors: Liu Jiahui , Yu Jinhua
Published: March 2020

The Honeysuckle pattern is a decorative pattern of plants, which is formed by the mutual influence and interaction between Chinese and Western cultures. It is a traditional plant pattern that was introduced into China along with the Silk Road and Buddhist art. Its formation promoted the development of plant patterns in China, brought positive impact on the historical changes of China’s decorative patterns, and has also contributed a lot to China’s brilliant and splendid decorative pattern art. This paper aims to explore the development process of Honeysuckle pattern from the following three expression elements and perspective of information graphic design: time, location and narration. It combines traditional graphic information with modern information graphic design to explore the cultural value and charm behind this classic pattern, thus trying to make information graphic design more possible.
PPP project life cycle renegotiation trigger event identification
Authors: Mu Zhaorong , Gao Tian
Published: March 2020

This paper analyzes the obstacles of PPP project contract implementation and PPP related contract content, finds out the uncertain events in the whole life cycle of PPP project, and further summarizes and filters it to get the renegotiation trigger event. Through literature review and case analysis, the causes of renegotiation trigger events were confirmed and their impacts were analyzed. Finally, based on the compensation of the contract status and the supplement of the contract status, the renegotiation control mechanism and the post-event problem supervision are proposed.