scholarly journals Using Aggregated Farm Location Information to Predict Regional Structural Change of Farm Specialisation, Size and Exit/Entry in Norway Agriculture

Agriculture ◽  
2021 ◽  
Vol 11 (7) ◽  
pp. 643
Author(s):  
Sebastian Neuenfeldt ◽  
Alexander Gocht ◽  
Thomas Heckelei ◽  
Klaus Mittenzwei ◽  
Pavel Ciaian
Keyword(s):  
Structural Change ◽  
Census Data ◽  
Simulation Analysis ◽  
Model Simulation ◽  
Explanatory Power ◽  
Regional Level ◽  
Location Information ◽  
Size Classes ◽  
Farm Group

In this paper, we extend the analysis of farm structural change with respect to farm specialisation, size and exit in Norway by, first, explicitly incorporating the location information of farms generating a number of neighbouring farms within a certain range and, second, by predicting farm numbers in addition to farm group shares, which allows for consideration of the exit farm group. We use Norwegian single-farm full census data for the period 1996–2015. Four production specialisations and seven size classes represent farm groups, as well as a residual and an exit farm group at the regional level. The estimates indicate the explanatory power and importance of aggregated farm location information in the model. Simulation analysis showed that the farm groups develop differently, given a change in the number of neighbouring farms with respect to the farm numbers and farm group shares.

scholarly journals Explaining farm structural change in the European agriculture: a novel analytical framework

2018 ◽  
Vol 46 (5) ◽  
pp. 713-768 ◽  
Author(s):  
Sebastian Neuenfeldt ◽  
Alexander Gocht ◽  
Thomas Heckelei ◽  
Pavel Ciaian
Keyword(s):  
Structural Change ◽  
Analytical Framework ◽  
Regional Level ◽  
Structure Variation ◽  
Macroeconomic Variables ◽  
Agricultural Income ◽  
Farm Structure ◽  
Socio Economic Variables ◽  
Farm Group ◽  
The Eu

Abstract In this paper, we analyse the drivers of farm structural change in the EU-27, applying a novel analytical framework in the field of agricultural economics known as the multiplicative competitive interaction (MCI) model. MCI offers a more parsimonious specification for estimating models of regional farm group shares compared to the often-applied Markov approach. The MCI framework enables farm group-specific equations, which are used to account for drivers specific to certain farm groups. The MCI framework explains farm group shares at the regional level taken from the Farm Structure Survey (FSS) using socio-economic variables from the Farm Accountancy Data Network (FADN) and other databases for the period 1989–2013. We consider eight production specialisations and two size classes at the NUTS 2 regional level. The results indicate that the past farm structure explains approximately 36 per cent of the EU farm structure variation across regions and time, followed by natural conditions (16 per cent), agricultural prices (14 per cent), macroeconomic variables (9 per cent), subsidies (7 per cent), population (6 per cent) and agricultural income (6 per cent). Further, we have run a simulation experiment where we derived elasticities of structural change with respect to time-varying variables. The structural change appears to be the most elastic with respect to income and macroeconomic variables.

Bigdata-based investigation of heterogeneous migration and population distribution

2021 ◽  
Author(s):  
Zhiwei Fan ◽  
L. Xiong ◽  
Bo Zheng
Keyword(s):  
Census Data ◽  
Population Distribution ◽  
Model Simulation ◽  
Human Mobility ◽  
Economic Systems ◽  
Migration Patterns ◽  
Demographic Trend ◽  
Education Levels ◽  
The Uk ◽  
Migration Probability

Abstract Human mobility is very important in understanding complex social and economic systems. With massive empirical datasets from the China Household Finance Survey and the National Statistics in the UK, we construct a migration probability matrix, and analyze the heterogeneous migration patterns. We then develop a random walk model to dynamically simulate the population distribution. In the stationary state, the resulting population distribution is in good agreement with the real statistical data. For comparison, simulations with an optimized gravity model and other datasets such as the census data in China are also performed. Further, the model simulation is applied to predict the demographic trend with different education levels. Our method could be generally extended to other real communities and internet worlds.

Measuring Threat and Violence

2018 ◽  
pp. 43-56
Author(s):  
Jeffrey S. Kopstein ◽  
Jason Wittenberg
Keyword(s):  
Statistical Models ◽  
Census Data ◽  
Location Information ◽  
Ecological Inference ◽  
Multivariate Statistical ◽  
Original Dataset ◽  
Geographical Unit ◽  
Nationalist Parties ◽  
Electoral Data

This chapter describes our data and methods. Our analysis is based on an original dataset of census returns, electoral results, and pogrom location information. We gathered these data at the lowest geographical unit for which they could be merged, yielding observations for over 2,000 localities. We use census data on religion and electoral data on support for Jewish and non-Jewish nationalist parties to measure the degree of perceived political threat prior to the outbreak of war. We establish the characteristics of those localities where pogroms occurred using a variety of methods, including multivariate statistical models and ecological inference.

scholarly journals Dynamic analysis of material motion using MATLAB/Simulation environment and test verification

2020 ◽  
Vol 12 (9) ◽  
pp. 168781402095780
Author(s):  
Mei Fang ◽  
Zhihong Yu ◽  
Wenjie Zhang
Keyword(s):  
Dynamic Analysis ◽  
Structural Design ◽  
Simulation Analysis ◽  
Model Simulation ◽  
Maximum Relative Error ◽  
Matlab Simulation ◽  
Simulation Results ◽  
Low Efficiency ◽  
Test Verification ◽  
The Mathematical Model

Throwing device is an important factor that directly affects the performance of chaff cutter. In this work, the dynamic analysis linked with the problem of low efficiency and residue blockage of disc knife chaff cutter is executed. Based on this perspective, the mathematical model, simulation, and testing of the material movement have been carried out. Simulations are performed in MATLAB/Simulink environment. An anemometer records the airflow velocity, which provides data for simulation analysis. The simulation results showed that during the movement along the blade, the material first performs deceleration and then accelerates; in other stages, only deceleration. And finally calculated the throwing distance. To support the presented simulations, an experimental study is conducted. The experimental results are compared with simulation results, the maximum relative error between the simulated value and the experimental value is 9.42%, which verified the correctness of the model. This research provides a theoretical basis for the structural design, parameter optimization, and matching of the chaff cutter.

Small-Scale Permanent Magnet Synchronous Wind Power System Control Method Research and Simulation Analysis

2011 ◽  
Vol 347-353 ◽  
pp. 3555-3558
Author(s):  
Peng Zhao ◽  
Wen Yi Li ◽  
Xuan He ◽  
Xin Yao ◽  
Yin Sha Wang ◽  
...  
Keyword(s):  
Vector Control ◽  
Permanent Magnet ◽  
Output Voltage ◽  
Control Method ◽  
Simulation Analysis ◽  
Model Simulation ◽  
Permanent Magnet Synchronous Motor ◽  
Small Scale ◽  
System Control ◽  
Power System Control

Aims at the small wind generations output voltage fluctuation problems, according to the characteristics of permanent magnet synchronous generator, by the vector control methods, in MATLAB/Simulink lans established permanent magnet synchronous motor current speed 2-ring vector control simulation model. Simulation results show that, the method can improve the small wind turbine output voltage stability.

Simulation of Oscillation Response of Free-Standing Object under Earthquakes

2011 ◽  
Vol 105-107 ◽  
pp. 417-422
Author(s):  
Qian Zhou ◽  
Wei Ming Yan
Keyword(s):  
Friction Coefficient ◽  
Simulation Analysis ◽  
Initial Conditions ◽  
Model Simulation ◽  
Dynamic Balance ◽  
Earthquake Intensity ◽  
Free Standing ◽  
Motion Equations ◽  
Object A ◽  
Simulink Model

To protect free-standing object,a rectangular object is taken as example and by SIMULINK technique its oscillation response under earthquakes were studied.Based on static and dynamic balance theories,oscillation conditions as well as motion equations of the free-standing object under earthquakes were deduced;Based on SIMULINK model,simulation analysis on the object under both level and vertical earthquakes were carried out,parameters such as initial conditions,earthquake intensity and ratio of width of the object against its height (B/H) and so on were discussed.Results show that under earthquakes oscillation conditions of the object relate closely to B/H,earthquake intensity and friction coefficient between object and its base;Under earthquakes oscillation response of the object is sensitive to initial conditions,and the response becomes more serious under less B/H or larger earthquake intensity conditions.Besides, SIMULINK technique can effectively simulate oscillation response of free-standing object under earthquakes,which proves the technique useful.

Car Seat Backrest Static Strength Experiment and Simulation

2009 ◽  
Vol 16-19 ◽  
pp. 178-182 ◽  
Author(s):  
Zhi Wei Xu ◽  
Zhong Qi Sheng ◽  
Hong Hong Zhang ◽  
Yong Xian Liu
Keyword(s):  
Finite Element ◽  
Simulation Analysis ◽  
Model Simulation ◽  
Static Strength ◽  
Analysis Model ◽  
Element Analysis ◽  
Shell Elements ◽  
Car Seat ◽  
Model And Simulation ◽  
The Cost

According to the characteristics of car seat structure and the distribution of car seat load, the finite element static strength model of the car seat is constructed in this paper. The model contains shell elements and beam elements. Some seat structure elements such as welding connection, screw connection, pin connection are simplified in the model. Simulation analysis of the static characteristics of car seat backrest frame model is carried out. At the same time, the experimental research on the static strength characteristics of the back seat is made by the measurements of non-electric physical quantities. By comparing and analyzing the results of experiment and computer simulation of seat static strength, the practicability and credibility of the seat static finite element analysis model and simplified model constructed in this paper are verified. It also proves that the simulation of various connecting forms of the seat structure is effective and is a reliable method in the structural design of the car seat. The model and simulation of the car seat can reduce the cost and shorten the design period.

Effect of crystalline lens surfaces and refractive index on image quality by model simulation analysis

2008 ◽  
Vol 6 (5) ◽  
pp. 377-380
Author(s):  
孔梅梅 孔梅梅 ◽  
Meimei Kong Meimei Kong ◽  
高志山 高志山 ◽  
Zhishan Gao Zhishan Gao ◽  
陈磊 陈磊 ◽  
...  
Keyword(s):  
Refractive Index ◽  
Image Quality ◽  
Simulation Analysis ◽  
Model Simulation ◽  
Crystalline Lens

Model-Based Development

2011 ◽  
pp. 289-312 ◽  
Author(s):  
Juan D. Lara ◽  
Esther Guerra ◽  
Hans Vangheluwe
Keyword(s):  
Programming Languages ◽  
Graphical Models ◽  
Code Generation ◽  
Simulation Analysis ◽  
Model Simulation ◽  
General Purpose ◽  
Test Case ◽  
Model Driven ◽  
Model Based ◽  
Design Activities

Since the beginning of computer science more than 50 years ago, software engineers have sought techniques resulting in higher levels of quality and productivity. Some of these efforts have concentrated in increasing the level of abstraction in programming languages (from assembler to structured languages to object-oriented languages). In the last few years, we have witnessed an increasing focus on development based on high-level, graphical models. They are used not only as a means to documentthe analysis and design activities, but also as the actual “implementation” of the application, as well as for automatic analysis, code, and test case generation. The notations used to describe the models can be standard and general purpose (for example, UML) or tightly customized for the application domain. Code generation for the full application is only accomplished for specific, well-understood application domains. A key initiative in this direction is OMG’s Model-Driven Architecture (MDA), where models are progressively transformed until executable code is obtained. In this chapter, we give an overview of these technologies and propose ideas following this line (concerning metamodeling and the use of visual languages for the specification of model transformation, model simulation, analysis and code generation), and examine the impact of model-based techniques in the development process.

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