The Study on the Stability of Agro-Ecosystem’s Productivity

2012 ◽  
Vol 433-440 ◽  
pp. 1998-2003
Author(s):  
Tang Heng ◽  
Teng Yue Gao
Keyword(s):  
Evaluation System ◽  
Wave Theory ◽  
Research Area ◽  
Target System ◽  
Development Theory ◽  
Ecosystem Productivity ◽  
Index Method ◽  
Volatility Index ◽  
Synthetic Index ◽  
The Stability

The article analyzes the stability of agro-ecosystem’s productivity taking sustainable development theory and wave theory as guideline, conducted field study of the research area taking ** as research case based on analyzing ** yearly grain output, and establishes relatively complete, clear and easy accessible evaluation target system for agro-ecosystem productivity stability through analyzing the constraints of the stability in the area and making full use of current statistical data with combination with actual situation. The evaluation system is set to be 4 layers with 17 indices as per Delphi and AHP method and comprehensive weight of each index is determined. It analyzes the stability of agro-ecosystem productivity from the aspect of both time and space with current indices and standardized data using synthetic index method and volatility index calculation method.

An Efficient Computational Model for Assessing the Stability Characteristics of Electro-active Natural Bio-resources

2020 ◽  
Vol 13 (4) ◽  
pp. 771-780
Author(s):  
Divyanshu Jhawar ◽  
Pranshu Sharma ◽  
Abhishek Sharma ◽  
Kathiravan Srinivasan ◽  
Bor-Yann Chen
Keyword(s):  
Microbial Fuel Cells ◽  
Research Work ◽  
Similarity Index ◽  
Structural Similarity ◽  
Research Area ◽  
Index Method ◽  
Work Related ◽  
Characteristics Analysis ◽  
Comparative Results ◽  
The Stability

Background: The properties of the natural bio-sensors as the fuel after treatment, is beneficial and considered as the most environmental friendly alternative. The microbial fuel cell will help in the bio electricity generation. To use them first, it is important to know the stability and the characteristics of such organic compound. The research presents the computational methods of assessment of stability and characteristics analysis of organic herbs, Syzygium and Citrus. Objective: MFC has a very vast research area and many scientists are rigorously working on MFCs. Here, we have explained research work related to what we have presented in the paper. Methods: To compute the stability of these microbial fuel cells, we have used two different methods on each herb, Structural Similarity Index Method (SSIM) and Graph Comparison using their Coordinates (GCC). Results: This research work provides the results of convergence towards the stability of herbs. Further, this section also presents the performance characteristics of the software algorithms and their comparative results to verify the outcomes of the herb characteristics using both methods. Conclusion: The proposed work is efficient in finding stability of MFCs on the selected herbs. The approach should work fine on other herbs as well. Machine Learning could have been much useful for this purpose if the availability of the data would have been much high.

scholarly journals Implementation of a process-based catchment model in a poorly gauged, highly glacierized Himalayan headwater

2007 ◽  
Vol 11 (4) ◽  
pp. 1323-1339 ◽  
Author(s):  
M. Konz ◽  
S. Uhlenbrook ◽  
L. Braun ◽  
A. Shrestha ◽  
S. Demuth
Keyword(s):  
Model Simulation ◽  
Research Area ◽  
Index Method ◽  
Ice Melt ◽  
Modeling Approach ◽  
Catchment Modeling ◽  
Daily Discharge ◽  
Hbv Model ◽  
Catchment Model ◽  
Snow And Ice

Abstract. The paper presents a catchment modeling approach for remote glacierized Himalayan catchments. The distributed catchment model TACD, which is widely based on the HBV model, was further developed for the application in highly glacierized catchments on a daily timestep and applied to the Nepalese Himalayan headwater Langtang Khola (360 km2). Low laying reference stations are taken for temperature extrapolation applying a second order polynomial function. Probability based statistical methods enable bridging data gaps in daily precipitation time series and the redistribution of cumulated precipitation sums over the previous days. Snow and ice melt was calculated in a distributed way based on the temperature-index method employing calculated daily potential sunshine durations. Different melting conditions of snow and ice and melting of ice under debris layers were considered. The spatial delineation of hydrological response units was achieved by taking topographic and physiographic information from maps and satellite images into account, and enabled to incorporate process knowledge into the model. Simulation results demonstrated that the model is able to simulate daily discharge for a period of 10 years and point glacier mass balances observed in the research area with an adequate reliability. The simple but robust data pre-processing and modeling approach enables the determination of the components of the water balance of a remote, data scarce catchment with a minimum of input data.

scholarly journals Predicting Stock Price Trend Using MACD Optimized by Historical Volatility

2018 ◽  
Vol 2018 ◽  
pp. 1-12 ◽  
Author(s):  
Jian Wang ◽  
Junseok Kim
Keyword(s):  
Stock Market ◽  
Stock Prices ◽  
Stock Price ◽  
Moving Average ◽  
Rapid Development ◽  
Price Trend ◽  
Technical Indicators ◽  
Volatility Index ◽  
Fixed Weight ◽  
The Stability

With the rapid development of the financial market, many professional traders use technical indicators to analyze the stock market. As one of these technical indicators, moving average convergence divergence (MACD) is widely applied by many investors. MACD is a momentum indicator derived from the exponential moving average (EMA) or exponentially weighted moving average (EWMA), which reacts more significantly to recent price changes than the simple moving average (SMA). Traders find the analysis of 12- and 26-day EMA very useful and insightful for determining buy-and-sell points. The purpose of this study is to develop an effective method for predicting the stock price trend. Typically, the traditional EMA is calculated using a fixed weight; however, in this study, we use a changing weight based on the historical volatility. We denote the historical volatility index as HVIX and the new MACD as MACD-HVIX. We test the stability of MACD-HVIX and compare it with that of MACD. Furthermore, the validity of the MACD-HVIX index is tested by using the trend recognition accuracy. We compare the accuracy between a MACD histogram and a MACD-HVIX histogram and find that the accuracy of using MACD-HVIX histogram is 55.55% higher than that of the MACD histogram when we use the buy-and-sell strategy. When we use the buy-and-hold strategy for 5 and 10 days, the prediction accuracy of MACD-HVIX is 33.33% and 12% higher than that of the traditional MACD strategy, respectively. We found that the new indicator is more stable. Therefore, the improved stock price forecasting model can predict the trend of stock prices and help investors augment their return in the stock market.

scholarly journals An Empirical Study about Influence of China’s Shadow Banking on the Stability of the Financial System

2016 ◽  
Vol 8 (4) ◽  
pp. 104 ◽  
Author(s):  
Bo Liu ◽  
Shuai Shao ◽  
Yan-yang Gao
Keyword(s):  
Evaluation System ◽  
Rapid Development ◽  
Risk Index ◽  
Financial System ◽  
Fuzzy Comprehensive Evaluation ◽  
Entropy Method ◽  
Response Analysis ◽  
Shadow Banking ◽  
Shadow Banks ◽  
The Stability

<p class="1"><span lang="EN-US">With the rapid development of the financial system in recent years, all kinds of financial derivatives teem and the size of the shadow banking is becoming more and bigger. It has become an important factor affecting the stability of China’s financial system. The influence of shadow banks on the financial system has two sides, on the one hand it is advantageous to the development and expansion of small and medium-sized enterprises as lubricant of corporate financing, on the other hand, features of shadow banking that highly leveraged and term mismatch also bring uncertainty to China’s financial system. Firstly, this paper calculates the size of the shadow banking in China, and then builds a fuzzy comprehensive evaluation system to evaluate the risk of China’s financial system. When determining the evaluation index, this paper apply KMV model to calculate the credit risk of China’s securities market, and the maximum entropy method to determine the index weight. After getting China’s financial system risk index and the size of shadow banking, this paper constructs the VAR model and makes the parameter estimation and impulse response analysis. Analysis results show that in a certain degree, the increase of the scale of shadow banks can reduce the risk of the financial system, but if it is over some certain threshold, it will increase the overall risk of the financial system.</span></p>

Hydrochemistry Research of Intercrystalline with Pore Brine and Pre-3D Modelling of Heibeiwadi Brine Deposit

2018 ◽  
Vol 783 ◽  
pp. 170-175
Author(s):  
Huang Song
Keyword(s):  
Phase Diagram ◽  
Qaidam Basin ◽  
Central Area ◽  
Research Area ◽  
3D Modelling ◽  
Salting Out ◽  
Characteristics Analysis ◽  
Water Salt ◽  
The Stability ◽  
Brine Layer

Intercrystalline and pore brine develop extensively in the Heibewadi research area which is located at south foot of Altun mountain of Qaidam basin. In central area, intercrystalline brine’s depths range from 5m to 90m. In northwest, south area and central deeper area, pore brine develops under intercrystalline brine layer. The 2 types of aquifers have strong yield property, TDS is 200-350g/l with average of 276g/l. Main salt compound can be mined out economically. According to analysis result of intercrystalline brine, TDS, Cl-, Na+, K+, Mg2+, Li+ irons’ grades are very steady. That mean intercrystalline brine exist in the water-salt system under balance. Only the stability of Ca2+ and SO42- are slightly poor. According the Kurtosis characteristics analysis, Ca2+, SO42- are no-normal positively platykurtic distribution, K+, Cl- and PH are normal positively platykurtic distribution. These 2 groups fall into a sub-class. And the combined with normal negatively platykurtic distribution-TDS and fall into platykurtic distribution group. Mg2+, Li+ are normal positively peaked distribution; Na+ is normal negatively peaked distribution. They all belong to peaked distribution group. According to Na+, K+, Mg2+//Cl-H2O quarternary phase diagram and Na+, K+, Mg2+//Cl-SO42-H2O pentabasic phase diagram, the chlorite and magnesium sulfate subtype have different hydro chemical characteristics and salting-in and salting-out rules.

scholarly journals The Sustainable Island Development Evaluation Model and Its Application Based on the Nonstructural Decision Fuzzy Set

2013 ◽  
Vol 2013 ◽  
pp. 1-10
Author(s):  
Quanming Wang ◽  
Peiying Li ◽  
Qinbang Sun
Keyword(s):  
Sustainable Development ◽  
Fuzzy Set ◽  
Evaluation System ◽  
Development Planning ◽  
Indicator System ◽  
Entropy Method ◽  
Development Theory ◽  
The Sustainable Development ◽  
Development Status ◽  
Development Indicator

Due to the complexity and diversity of the issue of sustainable island development, no widely accepted and applicable evaluation system model regarding the issue currently exists. In this paper, we discuss and establish the sustainable development indicator system and the model approach from the perspective of resources, the island environment, the island development status, the island social development, and the island intelligence development. We reference the sustainable development theory and the sustainable development indicator system method concerning land region, combine the character of the sustainable island development, analyze and evaluate the extent of the sustainable island development, orient development, and identify the key and limited factors of sustainable island development capability. This research adopts the entropy method and the nonstructural decision fuzzy set theory model to determine the weight of the evaluating indicators. Changhai County was selected as the subject of the research, which consisted of a quantitative study of its sustainable development status from 2001 to 2008 to identify the key factors influencing its sustainability development, existing problems, and limited factors and to provide basic technical support for ocean development planning and economic development planning.

On the instability of a falling film due to localized heating

2003 ◽  
Vol 475 ◽  
pp. 1-19 ◽  
Author(s):  
JAN M. SKOTHEIM ◽  
UWE THIELE ◽  
BENOIT SCHEID
Keyword(s):  
Surface Tension ◽  
Wave Theory ◽  
Quantitative Agreement ◽  
Surface Tension Gradient ◽  
Heated Plate ◽  
Dimensional Measure ◽  
Critical Marangoni Number ◽  
The Stability ◽  
Conductive Properties ◽  
Horizontal Band

We analyse the stability of a thin film falling under the influence of gravity down a locally heated plate. Marangoni flow, due to local temperature changes influencing the surface tension, opposes the gravitationally driven Poiseuille flow and forms a horizontal band at the upper edge of the heater. The thickness of the band increases with the surface tension gradient, until an instability forms a rivulet structure periodic in the transverse direction. We study the dependence of the critical Marangoni number, a non-dimensional measure of the surface tension gradient at the onset of instability, on the associated Bond and Biot numbers, non-dimensional measures of the curvature pressure and heat-conductive properties of the film respectively. We develop a model based on long-wave theory to calculate base-state solutions and their linear stability. We obtain dispersion relations, which give us the wavelength and growth rate of the fastest growing mode. The calculated film profile and wavelength of the most unstable mode at the instability threshold are in quantitative agreement with the experimental results. We show via an energy analysis of the most unstable linear eigenmode that the instability is driven by gravity and an interaction between base-state curvature and the perturbation thickness. In the case of non-zero Biot number transverse variations of the temperature profile also contribute to destabilization.

Study on Evaluation System of the Agent’s Capability Structure of International Energy Cooperation

2014 ◽  
Vol 1073-1076 ◽  
pp. 2488-2492
Author(s):  
Hong Li Yang ◽  
Ping Li ◽  
Xiao Li Guo
Keyword(s):  
Evaluation System ◽  
Energy Cooperation ◽  
Long Term Stability ◽  
Whole Process ◽  
The Stability ◽  
Building Capability ◽  
Capability Evaluation ◽  
Key Indicators ◽  
The Relationship

With the deepening of economic globalization, cooperation has become a mainstream trend, revealing the discipline of cooperation has become a key scientific issue. As a content of cooperation, international energy cooperation is a system of relations constituted by different energy cooperation agents, it reflects the composition of agents. Ability divergence and their capability system have an effect on the long-term stability and development of cooperation. Based on the theories, this paper put forward the main connotation of cooperation capacity structure, building capability evaluation system, clearing affect the stability of the key indicators of cooperation, exploring the relationship between cooperation agents’ capability structure and cooperative stability in order to study the whole process of international energy cooperation fluctuations trajectory.

Strength of Composite Laminated Bolted Joint Subjected to a Clamping Force

2006 ◽  
Vol 326-328 ◽  
pp. 1777-1780
Author(s):  
Jin Ho Choi ◽  
Young Hwan Lee ◽  
Jin Hwe Kweon ◽  
Woo Seong Che
Keyword(s):  
Composite Structures ◽  
Research Area ◽  
Experimental Results ◽  
Clamping Force ◽  
Bolted Joint ◽  
Important Research ◽  
Index Method ◽  
Area Index ◽  
Composite Joint ◽  
Important Research Area

As these composites have become more popular, composite joint design has become a very important research area, as these joints are often the weakest parts of composite structures. In this paper, the strength of a composite laminated bolted joint being subjected to a clamping force was tested and predicted using the FAI (Failure Area Index) method. The strengths of composite joints subjected to clamping forces on different geometric shapes and dimensions were predicted using the FAI method, and the results were compared with experimental results. From the tests and analyses, the strength of a given composite laminated bolted joint subjected to a clamping force could be predicted within 22.5% via the FAI method.

scholarly journals FINANCIAL PLANNING OF IMPORT OPERATIONS IN PE "ART-ENERGO"

2021 ◽  
Vol 5 (2) ◽  
pp. 61-71
Author(s):  
Zoriana Dvulit ◽  
◽  
Natalia Petryshyn ◽  
T. Kharchuk ◽  
◽  
...  
Keyword(s):  
Financial Planning ◽  
Evaluation System ◽  
Supplier Evaluation ◽  
Scientific Methods ◽  
Trading Company ◽  
Current State ◽  
Accounts Payable ◽  
General Scientific ◽  
The Stability ◽  
The Impact

Purpose. The purpose of the study is to formulate a proposal to improve the technology of planning the supply of goods as part of the financial planning of import operations of PE "Art-Energo" in accordance with the problems identified during the analysis of the enterprise. Among the objectives of the study are: - consideration of the current state and features of the functioning of the system of financial planning of import operations at the enterprise during the analysis of its activities; - identification of the most urgent problem that arises in the supply of goods within the financial planning of import operations of the enterprise; - formation of a proposal to solve the identified problem of financial planning of import operations and justification of its feasibility. Design/methodology/approach. To achieve the goals, special and general scientific methods were used, including: graphic method was used to visualize the cycle of financial planning of imports of PE "Art-Energo"; expert method was used to determine the weight of the criteria for evaluating suppliers in the system of financial planning of import operations of PE "Art-Energo"; comparison was used to justify the most favorable terms of cooperation and to select the best contractors; systematization was used for calculations of liquidity indicators; generalization was used to develop recommendations for working with partners by category in the system of financial planning of import operations of PE "Art-Energo". Findings. In the article is shown that the conditions of cooperation with foreign counterparties directly affect not only the competitiveness of the enterprise, but also the financial performance of its activities. It was found that non-parity terms of cooperation with suppliers can be one of the causes of cash gaps, which in turn leads to the inability of the company to repay its obligations on time and, consequently, to insolvency. It is established that the maneuverability of working capital is significantly reduced with the full advance of products, which is the main condition for cooperation of suppliers with PE "Art-Energo", so there is a need to transform the payment system. In order to increase the efficiency of the technology of planning the supply of goods as part of the financial planning of import operations, it is proposed to introduce a system of supplier evaluation in the activities of the enterprise. The hypothesis of a positive relationship between the introduction of supplier evaluation system as a tool of improvement the financial planning of import operations of PE "Art-Energo" and the growth of the company's ability to pay current liabilities, including timely payments on accounts payable due to operating cash flow is proven. Practical implications. The introduction of a supplier evaluation system based on the evaluation of estimation according to the relevant criteria and the classification of partners by category will help ensure transparency of the contractor selection mechanism, eliminating subjective preferences, thereby minimizing the impact of the human factor. That is why such a way to improve the technology of planning the supply of goods can find practical application not only in the case of PE "Art-Energo", but also for any other trading company. Originality/value. In the article, the authors suggest the use of a supplier evaluation system based on the results of the audit and the assignment of the rating to the contractors, that allow to identify their weaknesses and clearly formulate the tasks that need to be solved by the supplier in order to effectively cooperate with PE "Art-Energo". Eliminating the actual shortcomings of the supply system and the introduction of supplier evaluation system helps the company to reduce costs, risks, increase the quality of goods and ensure the stability of work.

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