bluuebunny/crossref_metadata_2025_split huggingface dataset:
Strengthening the Beef Cattle Farmer-Based Organization in Partnership System of Maiwa Breeding Center
Authors: Kasim S N , Abdullah A , Herry S , Tanrigiling  , Aminawar  
Published: October 2019

Abstract
Abstract.This research aimed to study improvement of beef cattle farmer-based organization in partnership system of Hasanuddin University Maiwa Breeding Centre. The research population was 75 farmers with a sample of 43 respondents whose determination was carried out in descriptive statistics using the Slovin formula. The sampling technique was carried out by simple random sampling. Observation data retrieval techniques are direct observation on MBC Unhas locations and in-depth interviews using structured questionnaires. The analysis was carried out quantitatively descriptively using descriptive statistics (frequency distribution table). As a result, the improvement strategy on resource (R), organization (O), and norm (N) aspects was perceived as less effective in achieving strengthen beef cattle farmer-based organization in partnership system of Maiwa Breeding Center.
Paddy Ratoon (Oryza Sativa) Nutrients Quality as Feed Forages at Various Cutting Height and Cutting Ages
Authors: Islami R Z , Susilawati I , Mustapa H K , Budiawati Y , Nurjanah S , Rochana A 
Published: October 2019

Abstract
This study was aimed to determine the nutrient quality of paddy ratoon (Oryza sativa) at various cutting ages. The design used was completely randomize design with factorial design. The first factor is the cutting height with a cutting height of 10 cm, 20 cm. The second factor is cutting ages which is 14 days cutting ages, 21 days cutting ages and 28 days cutting ages and 35 days cutting ages. The result showed that cutting age of paddy ratoon as forages that produce optimal nutrient quality is at the age 14 days after cutting, with 10.34% crude protein and 28.45% crude fiber and 1.15% crude fat. Height cutting of paddy ratoon is not significantly affected nutrient quality
The reason and prevention measures for the rod and tubing wear of the pumping unit in the Bei 301 operation area
Authors: Xie C Y , Ma Y Z , Jing Q Y , Zhang G , Sun Y S , Liu Q H 
Published: October 2019

Abstract
In order to study the effective prevention measures to improve the regulation effect of the anti-deflecting measure in Bei 301 operation area and prolong the pump cycle of the oil well. The calculation of the historical data of the eccentric wear well and the analysis of eccentric wear prevention effect show that eccentric wear condition in Bei 301 operation area of hailaer oilfield is relatively serious and the operating wells’ ratio of rod breakage and tube leakage increases year by year due to eccentric wear [1,2]. In 2014, the proportion of rod breakage and tube leakage in the operating wells of the operation area was 19.4% and 45.2% respectively, and the average pump inspection cycle was around 400 days. The reasons for the serious wear of the rod pipe in Bei 301 operation area are the improper production parameters, the submergence depth, high water content and well fluid properties according to the detailed data analysis of the pump operation. Active eccentric wear prevention measures have some effect, and next research direction for preventing eccentric wear is put forward in this paper: the paraffin-removing technology, bi-directional protected box coupling and low friction pump combined with the problems faced by the operating area.
A centralized coordinated control strategy for distributed generation when microgrid on grid
Authors: Tang W 
Published: October 2019

Abstract
This paper presents a centralized and coordinated control strategy for microgrid, whose control strategy includes the coordinated control of renewable energy sources (RESs) and energy storage systems (ESSs). To solve the schedulability of distributed generation in a microgrid, when it operates in grid-connected, a multiple operation mode is adopted, through switching the operation mode, the charge/discharge and state of charge (SOC) of ESSs can be maintained, and the loads will be shared by RESs first when microgrid occurs power deficiency, it reduces loss of ESSs. In this paper, a secondary control strategy for the microgrid model by simulated in MATLAB/Simulink, it through switched three modes, improves schedulability of microgrid and realizes SOC balance smoothly. The results show centralized and coordinated control strategy is accurate and useful.
Study on the risks and countermeasures after openness of the electricity market
Authors: Qin G Y , Liu D N , Liang J H , Pan Y , Wang L X 
Published: October 2019

Abstract
With the deepening of the reform of the electric power system, more and more uncertainties in the competitive electricity market mean more risks. This paper focuses on the risks and countermeasures after openness of the electricity market. Firstly, deeply analysis on the two traditional types transaction of power market which is large concentrated transaction and micro-balance of park electricity market; Secondly, analysis on the risk of transaction participants from three aspects. Finally, based on technology of information and platform, putting forward countermeasures and suggestions based on early warning of big data transaction platform, information value-added service and risk control strategies after openness of the electricity market. Future research orientation upon this analysis is establishment of power market risk evaluation index system and study of risk quantification methods.
An optimized dispatch model of combined heat and power system unit commitment considering heating network characteristics
Authors: Luo Z Q , Yang J F , Xie H B , Zhou S Y , Hu L X 
Published: October 2019

Abstract
The large-scale commissioning of combined heat and power unit leads to difficulty of peak regulation and wind consumption, and combined heat and power optimized dispatch is one of effective ways to solve this problem. Under existing optimized dispatch models of combined heat and power system, pre-decided unit commitment scheme may cause a large amount of wind curtailment because of excessive operating units and total minimum technical output of units. In view of these problems, through combination of unit commitment and optimized dispatch, an optimized dispatch model of combined heat and power system unit commitment considering heating network characteristics is established. Similarities and differences of heat and power energy transmission are analyzed, heat load partition balance equation as well as positive and negative spinning reserve constrains of thermal system partition are established, and influence of heating network characteristics, including time delay and heat loss, on unit commitment scheme and wind curtailment is studied. A numerical example shows that heating network characteristics influence unit commitment scheme (one unit shuts down an hour ahead and starts up an hour later). Besides, it shows that while meeting power and heat load demand, the model of this paper can timely start up or shut down units according to load change and spinning reserve demand, reduce total minimum technical output of operating units to 632.4 MW, and further improve wind power accommodation quantity to 3410.24 MW·h.
Analysis on operation reliability of hydropower units in China
Authors: Han Q , Liu Z L , Liu S L , Xu N 
Published: October 2019

Abstract
With the rapid development of hydropower in China, in just a few years installed capacity has leapt to the world’s first, in addition to thermal power outside the development of the second largest electricity supply. However, the equivalent availability level of hydropower units in China is lower than that of conventional fossil energy thermal power units, and the cost of unit engineering is higher, especially the unplanned shutdown coefficient of pumped storage units in China is much higher than the world level. Therefore, it is urgent to carry out the research on the operation reliability of generator sets. Based on the analysis and summary of the basic situation, operation situation, planned outage and unplanned shutdown of hydropower units in China, this paper puts forward the main problems of reliability of hydropower units and hydroelectric power plants, which are used for reference and exchange by professional and technical personnel engaged in hydropower industry.
Research and practice on coordination assessment system of Yunnan transmission network and power supply construction
Authors: Zhang X Z , Qian W , Wang Z M , Liu J , Zhao S 
Published: October 2019

Abstract
Power supply and power grid are both independent and closely related, and they are two parts of the power supply community. Power supply and power grid have their own characteristics and laws, and their interactions are different in different stages of development of power industry. Under the market environment of the new power system reform, some new changes have taken place in the relationship between the two. Firstly, this paper analyses the changes of the related factors of power construction after the reform of power system, and then constructs the coordination evaluation system of Yunnan power transmission network and power construction from the aspects of power development mode, energy policy and new energy access. Finally, taking Yunnan Province as an example, it evaluates the coordination of power transmission network and power construction in 2017, which proves the feasibility and science of the evaluation system.
CFD and experimental analyses of flow distribution uniformity in minichannel reactors with a bifurcation structure manifold
Authors: Zhuang X R , Xu X H , Li L , Xin X , Xu W F 
Published: October 2019

Abstract
This study investigated the flow distribution uniformity and pressure drop in minichannel reactors with a bifurcation structure inlet manifold and different type outlet manifolds. The numerical model was established and validated by experimental results. In order to analyze the effects of structural parameters on the flow distribution uniformity of the manifold, the bifurcation inlet manifold was first designed based on the principle of minimum entropy generation. The results showed that longer channel length of bifurcation in the inlet manifold allowed the flow to be fully developed and equally split into several flows. Then, with an identical bifurcation inlet manifold, the influences of outlet manifold with structures of bifurcation, triangle and rectangle, as well as the parallel minichannel length on the flow uniformity of minichannel reactors were also built and investigated. The results showed that the rectangular structure outlet manifold simplified the structure of minichannel reactors and reduced the parasitic power consumption. The flow uniformity of minichannel reactor increased as the parallel minchannel length increased and the impact was more significant at high inlet flow rate than at low inlet flow rate.
Study on the points and countermeasures of quality control in the wind turbine blades
Authors: Wang B J , Zhao Y , Zhang R G , Yang B , Xie X J 
Published: October 2019

Abstract
There are many problems in the technological development, research investment, staff ability and industrialized level of domestic wind turbine blade. This review summarizes the quality situation of wind turbine blade in the production process and proposes some advices and solutions in the further development of domestic wind turbine blade.
Research on voltage coordinated control strategy of large-scale renewable energy access to grid optimization
Authors: Huang W , Yang R , Shi J F , Yuan X T , Liu Y , Ding R Y , Zhan L Y , Yang Z L 
Published: October 2019

Abstract
With the increasing consumption of traditional energy sources and the destruction of the environment, traditional energy generation cannot meet the development of today’s society. Replaced by renewable clean energy, a large number of new energy access to the power grid, but large numbers of unconstrained access to the grid will seriously cause problems with unqualified voltage quality. In this paper, the reactive power demand Q of the grid is determined based on the difference between the measured voltage value and the voltage target value collected at the grid point exceeds the allowable range. And by calculating the SVG reactive power adjustment margin of each new energy power plant. For the adjustment margins of reactive power compensation equipment in each new energy power plant, reactive power distribution is implemented using strategies such as equal ratio or equal margin or priority allocation.
A comparative study on effects of various insulating layers of roof system on energy usage of building envelope
Authors: Raut A , Khatoon S , Goud P 
Published: October 2019

Abstract
The purpose of paper is to analyse the effectiveness of various roof systems based on insulations layers in hot climatic condition of Hyderabad, India. In this paper, Energy analysis using Autodesk’s Green Building Studio cloud computing software has been done. The Energy analysis results gives indication about the Energy usage of building as well as overall life cycle costing. The roof system has been studied with their carbon emission and Embodied Energy to understand the sustainability aspect of the insulating layers in combination to provide a green roof system. The materials used for studying the insulating effects of roof system which were analysed in combinations were cork, gypsum board, expanded polystyrene, rock wool, fibre glass, PVC mesh, Polyurethane, etc. Due to the insulating layers the heat transfer is reduced through the roof system, which affects the cooling load of building envelope which reduces the energy consumption. The study is significant to understand the occupant’s indoor comfort, environmental and long-term economic benefits of insulation for a building envelope.
Research on challenges and feasibility suggestions of inter-regional environmental coordination
Authors: Fa L N 
Published: October 2019

Abstract
Many countries along the Silk Road have their own characteristics in economic and political aspects. This study expounds the challenges faced by international environmental law construction. The difficulties in the formulation of international environmental legal documents, the differences between countries, and the lack of technical means of environmental protection make environmental development face difficulties. International and domestic lack of incentives for environmental protection has also become one of the problems. In the face of this dilemma, the governments of all countries should strengthen the international cooperation in environmental protection and promote the scientific means of environmental protection, cultivate the awareness of environmental protection among the people of all countries, and achieve the situation of harmonious development of environment and economy.
Multi-parameter Joint Optimization Based on Steam Turbine Thermal System Characteristic Reconstruction Model
Authors: Liu S , Shen J , Wang P H 
Published: October 2019

Abstract
Steam turbine thermal system characteristic reconstruction model for multi-parameter joint optimization is proposed in this paper. This paper has two main improvements. First, a steam turbine thermal system characteristic reconstruction model is conducted, which includes turbine, condenser and heater. There are three iterative nested algorithms in this model. In the innermost layer, avariable condition calculation model of condenser is nested, and the exhaust flow and exhaust steam pressure can be calculated. In the outermost layer, the power equation is applied as the iteration ends. In this model, simulation of thermal system of steam turbine three kinds of disturbing factors demand can be realized well and the joint optimization of thermal system of steam turbine flow section and the cold end can be realized. Through calculation and comparison, the model constructed in this paper is proved to have high accuracy, and the calculation process is stable and convergent. At the same time, the joint optimization method involving turbine main steam pressure and exhaust pressure is proposed here. In this method, heat consumption rate is the optimization objective, with steam turbine thermal system characteristic reconstruction model, the optimal main steam condenser and vacuum pressure were obtained. The result of A 600MW condensing unit showed that the method could be synchronized to determine the optimal combination of circulating pump, the best vacuum and sliding pressure curve of main steam under different load and different ambient temperature. Comparison results also showed that the joint optimization solution of main steam pressure and exhaust pressure is superior to optimized solution main steam pressure individually.
Mathematical Modelling of Drying Kinetics in the Natural Solar Drying of Mango
Authors: Touré S 
Published: October 2019

Abstract
There are several drying kinetic models. Some of them are theoretical, semi-theoretical or empirical. Among them, several are based on the Fick’s second law. Those models generally use some constant coefficients for the whole drying process. The present model uses the water speed of transfer. It is correlated to the drying rate, to the drying time and to the modelling parameters. Finally, the drying rate and the moisture content are expressed as functions of those parameters and the drying time. The modelling parameters, which are time dependent, are calculated from the experimental drying data. In a previous work, our mathematical model was applied in the modelling of natural solar drying of plantain banana. In the present work, the model is applied in the modelling of natural solar drying of mango. The drying rate is estimated with a high accuracy, as the relative errors between experiment and theory are in the range 0.03 % - 7.7 %. By way of comparison, the modelling performed using the characteristic drying curve yields relative errors varying between 11.37 % and 84.47 %. In the same way, the moisture content is estimated by our model with a high accuracy, as the relative errors lie in the range 0.003 % - 1.1 %. The modelling of the moisture content carried out using the Henderson and Pabis model yields an estimate with relative errors varying between 1.8 % and 5.26 %.
A novel anode material for lithium-ion batteries: silicon nanoparticles and graphene composite films
Authors: Zhang P B , You Y , Wang C , Fang X H , Ren W , Yang L Y , Chen XY 
Published: October 2019

Abstract
Silicon nanoparticles (Si NPs), with tremendous theoretical capacity, have been extensively studied how to be combined with graphene to form stable anodes for lithium-ion batteries. In this paper, a novel approach, chemical vapor deposition (CVD), is proposed to synthesis Si NPs and graphene composite film anode. Si NPs are well dispersed with carbon nanotubes in N methyl pyrrolidone solvent, spin-coated onto Cu foil as substrates to grow graphene, and successively and diversely embedded in graphene film, which is fabricated into anodes for lithium-ion batteries with high capacity of 1115.2 mAh/g. It is demonstrated a possible and promising method to prepare anode material for lithium-ion batteries.
Three-dimensional effects of trailing edge flap and winglet integrated on up-scale wind turbine blade
Authors: Motsamai O S , Muiruri P I 
Published: October 2019

Abstract
Wind turbines must generate wind power cost-effectively for the wind power to remain viable and competitive among other renewable resources. The rotor diameter continues increasing in size to capture more energy to reduce the costs of wind power. However, the size of the rotor diameter is expected to reach limit due to restrictions related to the rotation of the entire blades, transport, and installation issues. This study, therefore, seeks to compare the effects of trailing edge flap and winglet embedded on the up-scale wind turbine blade. The investigated configurations are blade with winglet, blade with trailing edge flap and blade with a combination of the winglet and trailing edge flap. A straight blade of the NREL 5MW wind turbine was used as a benchmark to quantify effects of trailing edge flap and winglet. All simulations were performed using the ANSYS FLUENT. The steady pressure-based solver in absolute velocity formulation modelled the flow over the blade surfaces governed by Reynold-Averaged Navier-Stokes (RANS) equations closed with the k – ω SST turbulence model. Blades with trailing edge flap and combined trailing edge flap and winglet show similar effects in comparison of pressure coefficient at 0.32R, 0.60R and 0.92R. Blade with a winglet generates the highest aerodynamic torque, while blade with trailing edge flap decrease most of the flap-wise bending moment. The blade with combined trailing edge flap and winglet can serve as an alternative design for improving the wind turbine performance. That is, at the normal operating condition the trailing edge flap can be held at its neutral position whenever increment of the power is the primary target.
Multifractal Spectrum Identification of Partial Discharge in GIS Based on Optical Detection
Authors: Xie R , Ge X Y , Zhu J P , Hu R P , Zhou F K , Zhang X X 
Published: October 2019

Abstract
Partial discharge (PD) pattern recognition is an effective means to accurately obtain the correspondence between PD features and insulation defects. Optical detection for PD has strong anti-interference ability. Therefore, this paper carried out research on the pattern recognition of PD optical signal. In this paper, the PD optical signal under four typical defects of gas-insulated switchgears (GIS) are obtained by fluorescent fiber sensing system, and the four kinds of grayscale images are established. The multifractal spectrum features of the grayscale images of the optical signals are extracted. By analysing the physical meaning of each feature information in the multifractal spectrum, the feature components for PD pattern recognition are extracted, and the improved conjugate gradient back propagation (BP) neural network algorithm is selected as the classifier. This paper show that the multifractal spectrum can effectively describe the degree of unevenness of PD grayscale images and the geometric features of different level. The correct recognition rate of all kinds of defects by the multifractal spectrum is more than 87%, which is better than the identification of the box dimension and information dimension as the feature components. It lays the foundation for the future application of the optical detection.
Design of distributed power quality monitoring system for distribution house
Authors: Luo J P , Han L Q , Yuan L L 
Published: October 2019

Abstract
The construction of smart grid puts forward higher requirements for power quality. As the key node of power distribution system, power quality monitoring of distribution room has always been the weak link of power operation and maintenance. This paper presents a distributed power quality monitoring system for distribution room, which includes hardware design and software design. It has the functions of acquisition, analysis, display and communication. It can complete distributed power quality monitoring for multiple outgoing branches of distribution room. The application of this system can provide data support for power quality analysis and management of low-voltage distribution system.