bluuebunny/crossref_metadata_2025_split huggingface dataset:
The influence of concept maps and visuospatial representations to students achievement and creativity on plant anatomy courses
Authors: Suprapto P K 
Published: October 2019

Abstract
Concept maps used to understand the concept of plant anatomy, and visuospatial representations are used to create 3 dimensions the imagination concept from two dimension images to 3 dimension concrete. That is can improve creativity. The purpose of the research was to know the effect of a concept map and visuospatial representation to the students achievement and creativity on plant anatomy courses. Method of this research was correlational, the sample was the biology perspective teacher students who take plant anatomy courses amount of 34 students. A deductive approach was used in learning and used Wimba model learning as a learning model based on visuospatial. Data collecting used concept map rubric plant anatomy test, visuospatial assessment and creativity. Data processing was multiple regression test. The result shows that simultaneously concept maps and 3D representation have a very significant effect on students achievement and creativity. The conclusion was the concept mapping and 3D representation effective to improve students achievement and creativity.
Process parameters selection of insulator contamination cleaning by dry ice
Authors: Fang J , Mo W X , Qin Y , Li S N , Jiang J , Su J H , Liu J S , Yu J H , Zhou W J 
Published: October 2019

Abstract
The dry ice cleaning was applied to the charged cleaning of the insulators in the power distribution room. On the basis of the system parameters optimization experiments of the insulator dry ice cleaning, setting the air pressure to 0.6 MPa and the dry ice flow rate to 2.5 kg/min, the process parameters optimization experiments of the insulator dry ice cleaning were carried out, and the optimal cleaning process parameters of the insulator were obtained through experiments. Using multi-physics simulation software Comsol to analyze the force distribution of external surface of the insulator when spraying dry ice at different distances and different angles in the dry ice cleaning, the experiment results were verified and the following conclusions were obtained: the cleaning angle and cleaning distance of the nozzle are affecting dry ice cleaning effect. The main process factors of the cleaning effect are most effective when the nozzle cleaning angle is from 15° to 25° and the cleaning distance is from 18 cm to 24 cm.
Experimental study on gasification of bituminutesous coal char with CO2 catalysed by CaO
Authors: Suo X L , Song Y , Sheng J G 
Published: October 2019

Abstract
The effects of CaO under normal pressure and CaO soaked in ammonia on the isothermal gasification of Jinjie bituminous coal char-CO2 are studied on the self-built fixed-bed experimental bench with analytical pure CaO as the precursor. The experimental results show that the gasification activity of Jinjie coal char increases with the increase of Ca addition. The load saturation is 5% at 780°C gasification temperature, and the load saturation are 3% at 810°C, 850°C and 900°C. Adding 3% CaO coal char can reduce the gasification temperature by 120°C, and reduce the coal char conversion rate to 95% by 85 min at 900°C gasification temperature. After soaking in ammonia water, the gasification activity of coal char and the gasification activity of coal char added with CaO catalyst are increased to different degrees. At 850°C, the increase of K value and Rm reach the maximum when CaO catalyzes coal char gasfication by ammonia immersion, which are 49.7% and 35.9%, respectively.
Data model of multiple new energy equipment for energy internet application
Authors: Peng Z W , Wen B J , Xie H Y , Huang J W , Wei L H , Xiao Z H , Jiang J , Zhang T F , He Y , Zhao G , Hu J 
Published: October 2019

Abstract
In order to meet the application demand of the “Internet Plus” smart energy demonstration project in Zhuhai, following the IEC61970/61968 CIM and the ECIM specification of China Southern Power Grid, an extension of CIM for multiple new energy equipment is carried based on the power grid resource CIM model and the physical model of GIS platform, where the DC model, the urban multi energy pipe network model, the energy production model, the energy storage model, customer energy source and load model are added to build a comprehensive multiple energy equipment data model from the perspective of the grid, city, park and user. The data model supports the integration of internal data and external data of integrated energy, and satisfies the integration and sharing of information among different systems of energy internet.
Physical and thermal coupling calculation for accelerator driven subcritical core
Authors: Dai C H , Lao X S , Liu Y , Zhang K L 
Published: October 2019

Abstract
The lead Anode (LBE) cooling ADS core is taken as the research object, and the ADS core axial one-dimensional physical thermal coupling model is established. The deterministic method is used to calculate the subcritical flux neutron flux distribution based on Monte Carlo. The method calculates the accelerator beam and the external neutron source generated by the spallation target. The ADS core thermal hydraulic analysis is carried out by a single-channel model, and the fuel elements are respectively divided into nodes in the axial direction and the radial direction, and the influence of thermal feedback on the neutronics characteristics of the subcritical core is considered. The one-dimensional physical thermal coupling model established in this paper can accurately calculate the spatial distribution of key parameters such as neutron flux density, fuel and cladding temperature in ADS core.
The influence and strategy on the dilemma of transnational environmental damage to the state responsibility on the current energetic situation
Authors: Lu W 
Published: October 2019

Abstract
This paper mainly analyzes the difficulties of transnational environmental damage to state responsibility: it is difficult to establish the causal relationship between the cause and effect, to identify the polluters, to quantify the damage, and to improve the supporting legal measures. This paper analyzes the impact of the above predicament on the energy situation, and puts forward some methods to improve it: propose to construct a unified legal norm system for transnational environmental damage and state responsibility, and improve the early warning mechanism of environmental pollution in order to prevent it before happening, provide effective and sufficient financial support, etc.
Application of current sensor based on giant magnetoresistance effect in distribution network
Authors: Xu A D , Li L C , Li P , Wang Z M , Wu Z B , Hao C J 
Published: October 2019

Abstract
Advanced sensing and measurement techniques are key technologies to realize a smart grid. With the advantages of having a high sensitivity, high linearity, small volume, and simple structure, the giant magnetoresistance (GMR) current sensor has broad application prospects in smart grid measurement and monitoring. This paper presents and studies a current sensor terminal based on giant magnetoresistance chip, the overall structure of the current sensor is designed, the power supply scheme and wireless communication scheme are formulated, the insulation protection and IP protection scheme of the current sensor are designed, and the current sensor terminal which can be used in the distribution network scene is prepared. The field response is carried out in the 10kV distribution transformer cable at last. The stability and reliability of the terminal operation are verified. The research results show that the current sensor developed in this paper has the advantages of convenient layout, stable operation and wireless communication. It can provide more comprehensive and real-time information support for the operation of distribution network and lay the foundation for the transparency of smart grid.
An optimal dispatch model based on load aggregator associated with energy hub
Authors: Yang M , Bai H K , Deng F Z , Song D W , Gong K 
Published: October 2019

Abstract
With the open of demand side, the demand response will increase the flexibility of power system. As an intermediate between electricity market sellers and demand side users, load aggregator (LA) has more choices in the load shedding transactions with a large amount of demand side resources. This paper considers the impact of energy hub (including electricity energy and heat energy) to the trade strategy of load aggregator and proposes the trading framework of load aggregator based on energy hub (EH), then a load aggregator trading model based on transaction cost is established. Through the linear optimization with trading model, the transaction costs of load aggregator are compared whether the energy hub is used or not, and the influence of efficiency of different modules in energy hub on their supply proportion is analysed, and finally the trading strategy of load aggregator is studied when the demand side resources take part in load shedding.
Dry friction damping blade structural vibration analysis of ocean nuclear power platform steam turbine
Authors: Wu J , Lao X S , Dai C H , Liu Y , Lv W J 
Published: October 2019

Abstract
The ocean nuclear platform turbine blade is studied. Based on the nonlinear finite element method, the contact pressure load on the friction contact surface is analyzed. The three-dimensional finite element vibration characteristic numerical model is established. The spring damping element is applied to describe the friction damping characteristics between the shroud and snubber contact surfaces of adjacent blades. The equivalent stiffness and damping coefficients of the shroud and snubber contact surfaces are calculated based on the experiment results of dry friction dynamic characteristics with blade material. The structural vibration response under different contact pressure load is analyzed by harmonic balance method. Furthermore, the simulation results are compared with the experiment results. The results show that the blade structural vibration response decreases significantly as a result of the damping between friction contact surfaces. The relative error of the resonance frequency for free blade is only 0.53%. The relative errors of modal damping ratio for the free blade and constrained blade are less than 2.65% and 20% respectively. The relative error of the constrained blade resonance amplitude is less than 15%. The reliability of the numerical analysis method is verified by comparison with experimental data.
In situ growth of CNTs on carbon fiber by chemical vapor deposition
Authors: Yao Z Q , Wang C G , Wang Y X 
Published: October 2019

Abstract
Carbon nanotubes (CNTs), as a kind of one-dimensional nanomaterial with special structure, have excellent properties in various aspects. Grafting CNTs onto carbon fiber (CF) surface to improve the mechanical properties of carbon fiber reinforced composites has been the focus at home and abroad. In this paper, chemical vapor deposition (CVD) was used to in situ grow CNTs on CF surface with carbon monoxide (CO) as carbon source and ferric nitrate (Fe (NO3)3·9H2O) as catalyst. The effect of different process conditions on the growth of CNTs were explored and the mechanism was briefly described. It is found that the oxidation treatment of CF could introduce a large number of reactive groups on the surface of CF, which was conducive to uniform dispersion of the catalyst. The morphology of CNTs were characterized by scanning electron microscopy (SEM). The results showed that the optimum growth concentration of catalyst precursor was 0.05 mol/L.
Coordinated power flow control of DC microgrid consisting of distributed generations and energy storage system
Authors: Nguyen T V , Kim K-H 
Published: October 2019

Abstract
In this paper, to operate DC microgrid in a flexible and reliable way, a coordinated power flow control strategy of DC microgrid and control methodology of power electronic converters are presented in both the grid-tied mode or islanded mode. For this purpose, the operation algorithm and power flow of DC microgrid are selected based on the distributed generation power, load demand, and energy storage system (ESS) status. The effectiveness of the system power balance and power flow control method are verified during operation mode transition through the simulation studies based on the PSIM software.
A Lattice Boltzmann simulation on fin enhanced water cooling of a solar CPV-T receiver
Authors: Ng T , Su Y 
Published: October 2019

Abstract
A fin enhanced cooling of a Solar Concentrated Photovoltaic Thermal (CPV-T) receiver is studied with the new computational method, i.e., an improved Lattice Boltzmann Method (LBM). Transient flow patterns and temperature fields have been obtained by the mesoscopic scale simulations with Non-dimensional Lattice Boltzmann Methods (NDLBM). The results show that the application of metal fins such as material copper will enhance the cooling slightly, while glass fins are not friendly to enhance heat transfer although they can keep high light transportation ratio. Geometry factors such as fin heights, gap distance, and thicknesses are also compared. It is found out that shorter smaller gap thicker fins are better designs because they reduce the impeding effects on fluid flow and increase the heat transfer areas between solid and fluid phases.
Single-phase photovoltaic grid-connected inverter for predictive control method with power feed-forward
Authors: Pei Y M , Xiong L , Zhang D J , Liu H M , Zhu Y J 
Published: October 2019

Abstract
In the traditional photovoltaic grid-connected inverter control, there are problems such as slow system response speed, low stability and grid-connected current distortion. In this regard, a novel current prediction control method for grid-connected inverter with power feed-forward is proposed. The method consists of DC voltage outer loop control, current predictive control, power feed-forward and grid voltage feed-forward. The characteristic is that the current prediction control algorithm derived from the state equation of the grid-connected inverter effectively suppresses the influence of DC voltage fluctuation on the grid-connected current and enhances the robustness of the system; the introduction of power feed-forward accelerates the dynamic response of the system; The introduction of grid voltage feed-forward reduces voltage distortion or current distortion. And the traditional PI control module is not needed, the structure is simple, and the circuit is easy to implement. Matlab/Simulink simulation model and experimental results prove the effectiveness of the proposed control method, which is more practical than the traditional double loop control method.
Study on practical voltage secondary loop testing tool
Authors: Ren Z , Qi Y W , Yang P W , Zheng B W , Lu J Q , Gao H 
Published: October 2019

Abstract
A practical test tool for voltage secondary circuit is used for field test of Secondary Screen Cabinet in transformer substation, such as power quality and microcomputer protection. Because of the influence of the structure of the voltage connection terminal and the site environmental conditions, there are unreliable contacts between the test terminals in the voltage test, which not only effects the test efficiency, but also has the risk of Electric leakage which effects personal safety. The whole structure of the voltage testing tool of this project adopts self-locking fixture structure. In the design, first of all, considering the stability of the structure, the main body of the voltage testing tool adopts the hook structure which is fully fitted with the voltage terminal. In practical use, it can quickly realize the tight combination with the voltage terminal and the requirements of the voltage testing tool which includes the stability and ease of use.
Removal of Hg2+ from flue gas by petroleum thioether
Authors: Fu K L , Yao M Y , Wang D B , Zhao H C , Cheng G W , Yang S 
Published: October 2019

Abstract
Petroleum thioether showed excellent flue gas de-Hg2+ ability to control mercury reemission. Petroleum thioether was prepared with high-sulfur crude oil as raw materials and characterized by FT-IR. The thioether group content was 0.104 g/g by the potentiometric titration with lead acetate as titrant. The Hg2+ removal performance of petroleum thioether was studied in simulated flue gas. The experiment results exhibited that petroleum thioether showed excellent Hg2+ removal efficiency in flue gas without threat of mercury reemission, and the process for Hg2+ capture by petroleum thioether was exothermic and went on smoothly below 60°C. 6 M HCl could be used to regenerate petroleum thioether trapped Hg2+, and there acquired a regeneration of 89.6%, which meant this Hg2+ removal treat showed low operation cost. Moreover, the regeneration of petroleum thioether captured Hg2+ facilitated the centralized processing of mercury and prepared well for the full utilization of mercury resources.
Analysis of Abnormal Causes and Renovation Measures for Voltage Monitor Board of Light Triggered Thyristor in Zhaoqing Converter Station
Authors: Wang Z , Feng L 
Published: October 2019

Abstract
In September 2018, 25 thyristor voltage monitor (TVM) boards of the Y4 valve of Pole 2 in Zhaoqing converter station did not have feedback signal. In order to make clear the root cause of this incident, the paper draws the detailed schematic diagram of the TVM board of converter valve in Zhaoqing station, and then studies the working principle of the TVM board and its feedback signal circuits, and analyzes the information interchange among all the functional modules. The pulse generation of positive voltage signal, negative voltage signal and overvoltage signal of the board are dissected. Then the equivalent circuit of each functional module is established to deduce the real reason of TVM board abnormality by quantitative calculation. Then the optimized scheme of TVM board circuit is proposed. Finally, comparative tests between the original circuit and the optimized circuit are carried out with the power supply of 459V RMS sinusoidal voltage and 7kV magnitude overvoltage respectively. The results show that the analysis of the TVM board working principle is correct, and the optimized scheme of TVM board circuit is effective.
Effect of Current and Wire Speed on Surface Roughness in the manufacturing of Straight Gear using Wire-cut EDM Process
Authors: Nur Rusdi , Muas M. , Apollo  , Risal Syah 
Published: October 2019

Abstract
The gears are an important part of a mechanism. Making gears requires high precision to avoid backlash. The machining process that can produce high precision is the process of Wire cut EDM. This study aims to determine the roughness of the workpiece surface and investigate the effect of current and wire speed on the roughness of the straight gear surface through wire cut machine EMS 45. The wire cut machining parameters used are 3, 5, and 7 amperes for current, and wire speed of 8, 10, and 12 mm/min. While the Wire material is a type of brass with 0.25 mm in diameter. The results presented that the increased use of current and wire speed will result in lower surface roughness, and vice versa. Therefore, it can be concluded that use low machine parameters to produce a smooth workpiece surface.
Development of Quadcopter for Tracking Object Using Image Processing
Authors: Nugraha Muhammad Ifan , Utomo Ardiansyah Tri , Taufik Akhmad , Tandioga Remigius , Syam Rafiuddin 
Published: October 2019

Abstract
Quadcopter is an unmanned aircraft that could be used as an image recorder at various view angle that can’t be placed by a human. This research is done to planning, building and implement a quadcopter that is equipped with a camera. Then, we apply for a tracking object program in the quadcopter which is called image processing. Therefore, this research begins by designing the mechanical and electrical of the quadcopter. While the designing of the software is done by making image processing program using C++. Data collection is done by testing the device in each section. Based on the result of research and testing, the result shows that quadcopter could follow a straight moving human, then it turns 90° to right as far as 10 meters. But, there are any movements that we did not expect before, which is in the altitude of the quadcopter, it because of the instability of the loiter flight mode.
Prototype Development of Portable Head Feed Harvesting Robot
Authors: Anugrah Muh Rifai , Jeky  , Muhammad Abdul Kadir , Taufik Akhmad , Syam Rafiuddin 
Published: October 2019

Abstract
This study aims to develop a prototype of portable head feed harvesting robot that can be installed in a tractor so that the users of tractors that initially only function during the farming season can also function during the harvesting season. This machine is divided into 3 main parts. In the first part there is a cutting mechanism that functions to cut rice using a DC electric motor with a crank mechanism connection to the cutting shaft. The second part is a rice lifting mechanism which functions to lift the rice cut into the conveyor belt position. The third part is a connection that connects the rice cutting machine to the used tractor using a bolt connection. The machine has been tested on rice field and work successfully.
Ultimate Strength Investigation of Ro-Ro Ship
Authors: Alie Muhammad Zubair Muis , Juswan  , Rachman Taufiqur , Paotonan Chairul 
Published: October 2019

Abstract
Ro-Ro ship has special characteristic for cargo handling because the cargo is transferred in horizontal direction. For example, cars can move by using ramp door which is located in front and/or aft of the ship. In conjunction with this, car passenger and other decks such as top including bottom part need to be investigated for local and global of Ro-Ro ship structure. In the present study, the ultimate strength investigation of Ro-Ro ship is conducted. There are three types of Ro-Ro ships are taken as the ship’s subject. The cross section of Ro-Ro is considered in the analysis and it is modelled having plate and stiffened plate. The one-frame is represented in longitudinal direction. The simply supported of boundary condition is applied and the cross section is assumed to be remained plane. The calculation of the ultimate strength using in-house integrated program. The ultimate strength of Ro-Ro ship is investigated under hogging and sagging conditions. The vertical bending moment is imposed to the cross section to obtain the ultimate strength including their progressive collapse. The result obtained by in-house program for three types of Ro-Ro ships are summarized and the collapse behaviour for local and global of the decks to the ultimate strength of Ro-Ro ship are also presented in this study.