Agricultural operation mode selection and development mechanism in ecological fragile areas under the background of china’s rural revitalization

2021 ◽  
pp. 002072092098505
Author(s):  
Haijuan Yang ◽  
Xiwu Hu
Keyword(s):  
Central Government ◽  
Mode Selection ◽  
Operation Mode ◽  
Strategic Decision ◽  
Land Rent ◽  
Ecological Civilization ◽  
Operation Modes ◽  
Ecological Protection ◽  
Rural Revitalization ◽  
Agricultural Operation

Ecological civilization construction and rural revitalization is a strategic decision made by the central government to solve the problems of ecological protection and rural sustainable poverty alleviation. At present, the dominant agricultural operation modes in China can be roughly divided into three types: family farm mode, agricultural enterprise mode and cooperative mode. Practice has proved that different agricultural operation modes have different effects. In ecological fragile areas, how to adopt agricultural operation modes can not only promote agricultural prosperity and increase farmers' income, but also protect the ecological environment and promote the coordinated development of ecology and economy needs further analysis. Based on the current rural revitalization strategy and ecological protection background, this paper analyzes the operation mechanism of agricultural operation mode from the principal-agent and ecological land rent theory, and analyzes the development dimensions of advantageous agriculture of various modes. On the basis of rural and farmers, this paper provides references for the selection of agricultural operation mode in different regions. There are many factors that need to be considered in the choice of agricultural operation mode in ecological fragile area. In the future, each region should conduct analysis and treatment according to its own actual situation.

scholarly journals Quantitative Evaluation of China’s Pork Industry Policy: A PMC Index Model Approach

Agriculture ◽  
2021 ◽  
Vol 11 (2) ◽  
pp. 86
Author(s):  
Youzhu Li ◽  
Rui He ◽  
Jinsi Liu ◽  
Chongguang Li ◽  
Jason Xiong
Keyword(s):  
Low Income ◽  
Quantitative Research ◽  
Large Scale ◽  
Industrial Structure ◽  
Central Government ◽  
Operation Mode ◽  
Control Policy ◽  
Price Control ◽  
Price Regulation ◽  
Index Model

To ease the fluctuation of hog prices and maintain the hog market’s stability, the central government of China has issued a series of hog price control policies. This paper, supplemented by co-word analysis and LDA thematic modeling, constructed 9 first-level indicators and 36 s-level indicators and used a PMC index model to conduct quantitative research on the selected 74 policies and regulations of China’s pig price regulation policies from July 2007 to April 2020. The research concludes that the research tool system of China’s hog price control is formed. The overall design of the hog price control policy is relatively reasonable, but there are still the following problems: the subject of China’s pig price control policy is singular, so it is difficult to form a resultant force; the policy pays attention to the price regulation in the short term, but ignores the long-term industrial structure adjustment; it emphasizes market supervision, but insufficient support for slaughtering and processing; it focuses on production and management to improve the development quality and efficiency of the pig industry, but does not take social equity into account. Finally, some policy suggestions are put forward: multi-department division of labor and close cooperation; adjusting the industrial structure of hog and carrying out appropriate large-scale breeding; establishing the operation mode of slaughtering and processing in the producing area to reduce the circulation cost of the pig industry; ensuring the consumption of pork by low-income groups and giving consideration to social efficiency and equity.

scholarly journals Kinematic analysis of a single-loop reconfigurable 7R mechanism with multiple operation modes

Robotica ◽  
2014 ◽  
Vol 32 (7) ◽  
pp. 1171-1188 ◽  
Author(s):  
Xiuyun He ◽  
Xianwen Kong ◽  
Damien Chablat ◽  
Stéphane Caro ◽  
Guangbo Hao
Keyword(s):  
Kinematic Analysis ◽  
Computer Aided Design ◽  
Operation Mode ◽  
Algebraic Approach ◽  
Single Loop ◽  
Operation Modes ◽  
Translational Mode ◽  
Kinematic Mapping ◽  
Multiple Operation ◽  
Aided Design

SUMMARYThis paper presents a novel one-degree-of-freedom (1-DOF) single-loop reconfigurable 7R mechanism with multiple operation modes (SLR7RMMOM), composed of seven revolute (R) joints, via adding a revolute joint to the overconstrained Sarrus linkage. The SLR7RMMOM can switch from one operation mode to another without disconnection and reassembly, and is a non-overconstrained mechanism. The algorithm for the inverse kinematics of the serial 6R mechanism using kinematic mapping is adopted to deal with the kinematic analysis of the SLR7RMMOM. First, a numerical method is applied and an example is given to show that there are 13 sets of solutions for the SLR7RMMOM, corresponding to each input angle. Among these solutions, nine sets are real solutions, which are verified using both a computer-aided design (CAD) model and a prototype of the mechanism. Then an algebraic approach is also used to analyse the mechanism and same results are obtained as the numerical one. It is shown from both numerical and algebraic approaches that the SLR7RMMOM has three operation modes: a translational mode and two 1-DOF planar modes. The transitional configurations among the three modes are also identified.

scholarly journals Influence of coolant flow rates on the heat exchanger parameter at variable operation modes

Vestnik MGSU ◽  
2019 ◽  
pp. 621-633 ◽  
Author(s):  
Tatyana A. Rafalskaya ◽  
Valery Ya. Rudyak
Keyword(s):  
Heat Exchanger ◽  
Heat Exchangers ◽  
Operation Mode ◽  
Coolant Flow ◽  
Flow Rates ◽  
Variable Heat ◽  
Operation Modes ◽  
Mathcad Software ◽  
The Given ◽  
Supply Systems

Introduction. Being used in various industries, heat exchangers most often work under conditions of variable coolant flows and temperatures. At the same time, the existing theories of calculating the heat exchanger operation modes are based on the use of constant unitless parameters at any operation mode. Taking into account the effect of coolant rates on the heat transfer coefficient of the heat exchangers, the given relations are bound to specific types of heat exchangers and can only be used at constant coolant temperatures. The purpose of this study is to obtain expressions for determining the effect of coolant flow rates on the variable heat exchanger parameter. Materials and methods. The main variable operation modes for water-to-water heat exchangers used in heat supply systems are determined. Using simulation in the PTC Mathcad software, dependencies describing the change in the heat exchanger parameter for all the considered variable operation modes are defined. This made it possible to obtain a general formula for the change in the heat exchanger parameter for varying coolant flow rates. Coefficients in this formula take into consideration the effect of coolant temperatures, which cannot be known when calculating variable conditions, especially when the interconnected heat exchangers are operating. Results. To test applicability of the existing relations describing the change in the heat exchanger parameter and of obtained formula, a large number of heat exchangers is calculated at variable operation modes. Comparison with the simulation results shows that the correlations of heat exchanger theories work well at the mode with constant coolant temperatures only, while their use at other operation modes can lead to large calculation errors. Conclusions. The obtained formula allows finding the effect of coolant flow rates on the variable heat exchanger parameter. The formula can be used to predict the operation modes of large systems including a large number of various-type heat exchangers.

The Value of Ecological Assets Based on Land Cover/Use Pattern in Kunming, Yunnan Province

2021 ◽  
Author(s):  
Meng Xu ◽  
Kouqiang Zhang ◽  
Shu’na Wei
Keyword(s):  
Environmental Economics ◽  
Water Conservation ◽  
Research Area ◽  
Scientific Basis ◽  
Ecological Civilization ◽  
Ecological Protection ◽  
Supervision And Management ◽  
Ecological Assets ◽  
Assets Assessment ◽  
Ecological Construction

Abstract Nowadays, the quantitative assessment of the ecological assets assessment was a hot topic and focus in the field of ecology and environmental economics. Quantitative evaluation of ecological assets can monetize the value of ecological assets, strengthen local ecological environment protection, and promote the service functions of regional ecosystems. Taking urban area as research area can clarify the value of local ecological protection and provide a scientific basis for the positioning of the functions and the construction of ecological civilization. The results showed that the value of ecological assets in Kunming was 249.858 billion yuan and 305.180 billion yuan in 2010 and 2020, respectively. Grassland made the largest contribution to ecological assets and was an important part of the composition of ecological assets, and the value of soil and water conservation occupied a large proportion in Kunming's ecological assets. The value of ecological assets in Kunming was growing in general, but a few ecological services have declined in value, so it was necessary to increase the ecological construction and strengthen the supervision and management of ecological assets.

Fast Operation Mode Selection for Highly Efficient IoT Edge Devices

2020 ◽  
Vol 39 (3) ◽  
pp. 572-584 ◽  
Author(s):  
Farzad Samie ◽  
Vasileios Tsoutsouras ◽  
Dimosthenis Masouros ◽  
Lars Bauer ◽  
Dimitrios Soudris ◽  
...  
Keyword(s):  
Mode Selection ◽  
Operation Mode ◽  
Highly Efficient ◽  
Selection For

scholarly journals Coupling between Carbon Efficiency and Technology Absorptive Capacity—A Case Study of the Yangtze River Economic Belt

2020 ◽  
Vol 12 (19) ◽  
pp. 8010 ◽  
Author(s):  
Xiaoming Jiang ◽  
Chuiyong Zheng ◽  
Chao Liu ◽  
Wenjian Zhang
Keyword(s):  
Economic Development ◽  
Absorptive Capacity ◽  
Yangtze River ◽  
Evaluation Model ◽  
The Yangtze River ◽  
Ecological Civilization ◽  
Carbon Efficiency ◽  
Ecological Protection ◽  
Foreign Capital Flows ◽  
Middle Stream

Regional carbon efficiency (CE) improvement is critical to China’s “taking concerted efforts to achieve ecological protection” strategy in the Yangtze River Economic Belt (YREB) and their program to build a leading demonstration belt for ecological civilization. This study applied the super efficiency slacks-based measure to calculate the regional differences and evolution characteristics of the YREB’s CE from the year of 2006 to 2017. It also constructed a coupling evaluation model to empirically analyze the interactions between CE and technology absorptive capacity (TAC). The results showed that (1) the CE for all YREB provinces followed a “U-shaped” trend. TAC generally increased and incrementally decreased in the sequence of the upper stream, middle stream, and downstream. The gap among the downstream, upper stream, and middle stream increased; (2) coupling between the CE and TAC for the YREB provinces can be characterized as a relatively stable medium to low coupling degree and medium-to-high coordination degree. To improve coupling and achieve balanced, sustainable development in the YREB, this study proposes several measures, including promoting balanced, high-quality economic development, building the YREB talent pool, appropriately guiding foreign capital flows, implementing the strategy of driving economic development through innovation, and launching the network for coordinated technological innovation in YREB.

Type Synthesis of Variable Degrees-of-Freedom Parallel Manipulators With Both Planar and 3T1R Operation Modes

2012 ◽  
Author(s):  
Xianwen Kong
Keyword(s):  
Degrees Of Freedom ◽  
Operation Mode ◽  
Parallel Manipulators ◽  
Type Synthesis ◽  
Operation Modes ◽  
Moving Platform ◽  
Multiple Operation ◽  
Schönflies Motion

Parallel manipulators (PMs) with multiple operation modes are novel reconfigurable PMs which use less number of actuators and can be reconfigured without disassembly. Although several classes of PMs with multiple operation modes that have the same DOF (degrees-of-freedom) in all the operation modes have been proposed, only one class of variable-DOF PMs with multiple operation modes — PMs with multiple operation modes that do not have the same DOF in all the operation modes — have been proposed so far. This paper deals with the type synthesis of variable-DOF PMs with both planar and 3T1R (or Schönflies motion which has three translational DOF and 1 rotational DOF) operation modes. The axes of rotation of the moving platform in the planar operation mode are not parallel to the axes of rotation of the moving platform in the 3T1R operation mode. At first, an approach to the type synthesis of PMs with multiple operation modes is recalled. Based on the results on the type synthesis of planar PMs and 3T1R PMs, the types of variable-DOF PMs with both planar and 3T1R operation modes are then obtained. This work can be extended to the type synthesis of other classes of PMs with multiple operation modes.

scholarly journals Risk, commercialism and social purpose: Repositioning the English housing association sector

Urban Studies ◽  
2017 ◽  
Vol 55 (9) ◽  
pp. 1924-1942 ◽  
Author(s):  
Tony Manzi ◽  
Nicky Morrison
Keyword(s):  
Decision Making ◽  
Central Government ◽  
Housing Association ◽  
Strategic Decision ◽  
Operating Environment ◽  
Housing Associations ◽  
Private Funding ◽  
For Profit ◽  
Public Subsidy ◽  
Not For Profit

Originally seen as the ‘third arm’ of UK housing policy, the independent, not-for-profit housing association sector had long been seen as effective in ‘filling the gap’ where the state or market were unable to provide for households in need. Since the 1980s in particular, successive governments had viewed housing associations in favourable terms as efficient, semi-autonomous social businesses, capable of leveraging significant private funding. By 2015, in contrast, central government had come to perceive the sector as inefficient, bureaucratic and wasteful of public subsidy. Making use of institutional theory, this paper considers this paradigm shift and examines the organisational responses to an increasingly challenging operating environment. By focusing, in particular, on large London housing associations, the paper analyses their strategic decision-making to address the opportunities and threats presented. The paper argues that in facing an era of minimal subsidy, low security and high risk, the 2015 reforms represent a critical juncture for the sector. Housing organisations face a stark dilemma about whether to continue a strategy of ‘profit for purpose’ or to embrace an unambiguously commercial ethos. The article contends that the trajectory of decision-making (although not unidirectional) leads ultimately towards an increased exposure to risk and vulnerability to changes in the housing market. More fundamentally, the attempt to reconcile social and commercial logics is likely to have wider consequences for the legitimacy of the sector.

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