scholarly journals STABILITY ANALYSIS FOR EMBANKMENTS WITH GEOELECTRICITY

2020 ◽  
Vol 15 (2) ◽  
pp. 114-122
Author(s):  
Teddy Wartono Sudinda
Keyword(s):  
Stability Analysis ◽  
Groundwater Flow ◽  
Water Level ◽  
Human Activities ◽  
Soil Layer ◽  
Flow Patterns ◽  
Soil Density ◽  
The Stability ◽  
The Right

Abstract The collapse of the embankment is a problem that needs attention to find the right solution, so that the risk can be minimized. The condition of the embankment is influenced by the strength of the soil layer of the embankment, groundwater flow in the embankment, the condition of the water level of the embankment and human activities around the embankment. Changes in the quality of soil density in the embankment can form cavity zones within the embankment which cause changes in groundwater flow patterns in the embankment. The degradation of the soil layer of the embankment can cause piping, overtopping which is the cause of erosion of the embankment body and disturbs the stability of the embankment. Therefore, to determine the condition of the embankment soil layer, research on the stability of the embankment has been carried out using the geoelectric method at the location of the embankment in the Cipancuh and Penjalin reservoirs, so that an image of the embankment soil layer is obtained to determine the cavity zones in the embankment, the flow pattern in the embankment soil layer. Keywords:  cavity zones, flow patterns, geoelectric methods, the stability of the embankment.

Conjunction effect of stream water level and groundwater flow for riverbank stability analysis

2010 ◽  
Vol 62 (4) ◽  
pp. 707-715 ◽  
Author(s):  
Shih-Wei Chiang ◽  
Tung-Lin Tsai ◽  
Jinn-Chuang Yang
Keyword(s):  
Stability Analysis ◽  
Groundwater Flow ◽  
Water Level ◽  
Stream Water ◽  
Riverbank Stability

scholarly journals Stability Analysis of R&D Cooperation in a Supply Chain

2015 ◽  
Vol 2015 ◽  
pp. 1-10 ◽  
Author(s):  
Luyun Xu ◽  
Dong Liang ◽  
Zhenjie Duan ◽  
Xu Xiao
Keyword(s):  
Game Theory ◽  
Stability Analysis ◽  
Knowledge Spillovers ◽  
Opportunistic Behavior ◽  
Collaborative Process ◽  
Level Of Knowledge ◽  
The Stability ◽  
The Cost ◽  
Inherent Quality

R&D outsourcing becomes the often-adopted strategy for firms to innovate. However, R&D cooperation often ends up with failure because of its inherent quality of instability. One of the main reasons for cooperation failure is the opportunistic behavior. As the R&D contract between firms is inherently incomplete, opportunistic behavior always cannot be avoided in the collaborative process. R&D cooperation has been divided into horizontal and vertical types. This paper utilizes game theory to study opportunistic behavior in the vertical R&D cooperation and analyzes the equilibrium of the cooperation. Based on the equilibrium and numerical results, it is found that the vertical R&D cooperation is inherently unstable, and the downstream firm is more likely to break the agreement. The level of knowledge spillovers and the cost of R&D efforts have different effects on firms’ payoffs. When the level of knowledge spillover is low or the cost of R&D efforts is high, mechanisms such as punishment for opportunism may be more effective to guarantee the stability of cooperation.

scholarly journals Coupling Influence on the dq Impedance Stability Analysis for the Three-Phase Grid-Connected Inverter

Energies ◽  
2019 ◽  
Vol 12 (19) ◽  
pp. 3676
Author(s):  
Chuanyue Li ◽  
Taoufik Qoria ◽  
Frederic Colas ◽  
Jun Liang ◽  
Wenlong Ming ◽  
...  
Keyword(s):  
Stability Analysis ◽  
Nyquist Plot ◽  
Current Control ◽  
Impedance Ratio ◽  
Three Phase ◽  
Grid Impedance ◽  
Nyquist Criterion ◽  
Grid Connected Inverter ◽  
The Stability ◽  
The Right

The dq impedance stability analysis for a grid-connected current-control inverter is based on the impedance ratio matrix. However, the coupled matrix brings difficulties in deriving its eigenvalues for the analysis based on the general Nyquist criterion. If the couplings are ignored for simplification, unacceptable errors will be present in the analysis. In this paper, the influence of the couplings on the dq impedance stability analysis is studied. To take the couplings into account simply, the determinant-based impedance stability analysis is used. The mechanism between the determinant of the impedance-ratio matrix and the inverter stability is unveiled. Compared to the eigenvalues-based analysis, only one determinant rather than two eigenvalue s-function is required for the stability analysis. One Nyquist plot or pole map can be applied to the determinant to check the right-half-plane poles. The accuracy of the determinant-based stability analysis is also checked by comparing with the state-space stability analysis method. For the stability analysis, the coupling influence on the current control, the phase-locked loop, and the grid impedance are studied. The errors can be 10% in the stability analysis if the couplings are ignored.

Influence of exogenous and endogenous factors on the quality of the preanalytical stage of laboratory tests (review of literature)

2020 ◽  
Vol 65 (12) ◽  
pp. 778-784
Author(s):  
D. P. Piskunov ◽  
L. A. Danilova ◽  
A. S. Pushkin ◽  
S. A. Rukavishnikova
Keyword(s):  
Laboratory Testing ◽  
Cell Metabolism ◽  
Endogenous Factors ◽  
Preanalytical Phase ◽  
Exogenous Factors ◽  
The Stability ◽  
The Right ◽  
Needle Diameter ◽  
And Storage

A literature review in the article presents an analysis of the influence of endogenous and exogenous factors on quality of preanalytical phase of laboratory testing. The review shows significance of external and internal factors influencing blood samples at preanalytical phase of laboratory testing. Among the exogenous factors considered: phlebotomy, test tubes for samples, transportation and storage. A number of factors exist at this phase that significantly affect test results. We examined these aspects of phlebotomy process: staff training, disinfectant contamination, needle diameter, needle material contamination. The review considers possible contamination with tube components and the importance of choosing the right anticoagulants and excipients. Transportation and storage of biological samples can be a source of errors at the preanalytical phase of laboratory testing. We analyzed the problem of determining the stability of analytes during storage and aspects of transportation samples by modern means. Among the endogenous factors considered: hemolysis, lipemia, icterricity, cell metabolism.. Hemolysis is one of the most frequent consequences of errors at the preanalytical phase. We analyzed importance of choosing a method for identifying hemolized tubes and the heterogeneity of bias results on different analytical systems. The review shows contribution of various classes of lipoproteins to turbidity of sample, possible preanalytical errors and impact on analytical tests. We examined possible effects of high bilirubin concentrations on analyte measurements. In the review, we also examined metabolism of some cells and its effect on samples.

scholarly journals On uniform asymptotic stability for nonlinear integro-differential equations of Volterra type

2019 ◽  
pp. 161-166
Author(s):  
Natalia Sedova
Keyword(s):  
Stability Analysis ◽  
Asymptotic Stability ◽  
Sufficient Conditions ◽  
Zero Solution ◽  
Auxiliary Function ◽  
Uniform Asymptotic Stability ◽  
Volterra Type ◽  
Razumikhin Technique ◽  
The Stability ◽  
The Right

The specifics of the application of Razumikhin technique to the stability analysis of Volterra type integrodifferential equations are considered. The equation can be nonlinear and nonautonomous. We propose new sufficient conditions for uniform asymptotic stability of the zero solution using the phase space of a special construction and constraints on the right side of the equation. In the presented constraints we can analyze stability, relying not only on the behavior of the auxiliary function along the solutions, but also on the properties of the so called limiting equations.

scholarly journals Experimental and simulated milling stability tests

Mechanik ◽  
2017 ◽  
Vol 90 (11) ◽  
pp. 965-967
Author(s):  
Piotr Andrzej Bąk ◽  
Krzysztof Jemielniak
Keyword(s):  
Numerical Simulation ◽  
Stability Analysis ◽  
Time Domain ◽  
Cutting Parameters ◽  
Milling Machine ◽  
Machined Surface ◽  
Simulation Results ◽  
The Stability ◽  
The Time Domain

Self-excited vibrations significantly reduce the milling productivity, deteriorate the quality of machined surface and tool life. One of the ways to avoid these vibrations is to modify the cutting parameters based on the stability analysis results. A method of numerical simulation of self-excited vibrations in the time domain can be used for this purpose. A comparison of numerical simulation results with those from experiments conducted using a milling machine is presented. The results confirm the correctness of applied modeling.

scholarly journals Strategi Pemasaran Cabai Merah Pada Sub Terminal Agribisnis Manik Mekar Nadi

2017 ◽  
Author(s):  
NI NYOMAN TISNA DEWI ◽  
I NYOMAN GEDE USTRIYANA ◽  
A.A.A. WULANDIRA SAWITRI DJELANTIK
Keyword(s):  
Technological Development ◽  
Product Distribution ◽  
Marketing Strategies ◽  
External Factors ◽  
Business Networks ◽  
Market Demand ◽  
The Government ◽  
The Stability ◽  
The Right

The Marketing Strategies of Red Chili at Sub Terminal AgribusinessManik Mekar NadiRed chili is one type of commercial vegetable that has long been cultivated in Indonesia. STA Manik Mekar Nadi has implemented marketing strategies to market its agricultural production, especially red chili. The purpose of the study was to analyze the internal and external factors, as well as the right strategies to be carried out by STA Manik Mekar Nadi in the marketing of red chili. The choice of location was done purposively and the number of the key informants was seven peoples. Results of research of marketing strategies of red chili showed that the internal factors include: the strength factors, namely, its strategic location, complete facilities, regular customers, and the guaranteed quality of red chili, while the weakness factors, namely, lack of capital, perishable products, unable to meet the demand, not using the services / advertising in the mass media. External factors include: opportunity factors, namely increasing purchasing power of consumers, government supports, increased domestic market demand, and technological development support, while the threat factors, namely, the emergence of new similar competition, consumers ‘sensitivity to price changes, fluctuations in the price of red chili at the local farmers, and the stronger bargaining power of consumers. The strategies adopted by STA Manik Mekar Nadi in marketing the red chili are to maintain the quality of red chili, to expand markets and product distribution, to increase the production of red chili, to have capital loans, promotion of technology, product standardization, standardization of prices, to expand business networks, to increase operational facilities, to maintain the stability of prices at the consumer level, and to increase the stock of red chili. The STA Manik Mekar Nadi is recommended to apply for financial assistance to the government, to add transportation and to enlarge the warehouse, as well as to conduct promotion.

scholarly journals Effects of Rapid Water-Level Fluctuations on the Stability of an Unsaturated Reservoir Bank Slope

2020 ◽  
Vol 2020 ◽  
pp. 1-10
Author(s):  
Jin-Zhu Mao ◽  
Jia Guo ◽  
Yong Fu ◽  
Wei-Peng Zhang ◽  
Ya-Nan Ding
Keyword(s):  
Finite Element ◽  
Stability Analysis ◽  
Water Level ◽  
Coupling Effect ◽  
Water Pressure ◽  
Water Level Fluctuations ◽  
Stability Factor ◽  
Bank Slope ◽  
The Stability ◽  
Reservoir Bank Slope

The instability of reservoir slope is likely to cause some severe natural hazards such as surge and barrier lake. In this study, the changes in seepage field and the distribution of the unsaturated zone of a reservoir bank slope subjected to rapid water-level fluctuations are investigated using the finite element method. The stability analysis of a reservoir slope under water-level fluctuation with a rate of 2 m/day is performed. The stability analysis is based on the theory of unsaturated soil mechanics and saturated-unsaturated seepage and accounts for the hydromechanical coupling effect. The changes in shear stress and strain as well as pore water pressure due to rapid water-level fluctuations are explicitly examined. Furthermore, the stability factor of safety, the underlying failure mechanism, and relevant influence factors are discussed. Based on the finite element analysis, it is found that the rapid loss of matrix suction would give rise to the surface landslide near the slope toe.

Stability Analysis of Accumulation Landslides in the Three Gorges Reservoir Area Under Reservoir Water Level Fluctuation Based on Multi-Circular Model

2021 ◽  
Author(s):  
Zhiqiang Fan ◽  
Yanhao Zheng
Keyword(s):  
Stability Analysis ◽  
Water Level ◽  
Three Gorges Reservoir ◽  
Three Gorges ◽  
Reservoir Water ◽  
Reservoir Water Level ◽  
Landslide Stability ◽  
Slip Surfaces ◽  
The Three Gorges ◽  
The Stability

Abstract In the Three Gorges Reservoir (TGR) area, the accumulation landslide characterized by stepped slip surfaces is widely developed, and its stability is significantly affected by the fluctuation of reservoir water level. In this paper, the Shuping landslide, a typical accumulation landslide in the TGR area, was selected to study the effect of water level fluctuations on landslide stability. Based on Multi-Circular (M-C) model, it is found that the decline of reservoir water level was the dominant factor causing the decrease of landslide stability. At the end of the decline of reservoir water level, the landslide stability was minimum and the corresponding moment was the most dangerous. The effect of the drawdown speed of reservoir water level on the minimum value of landslide stability had a threshold effect, although the minimum stability coefficient of landslide decreased with the increase of drawdown speed. Under the most dangerous water level conditions, the stability of the piled landslide increased linearly with the increase of the net thrust of piles. Also, by comparing with other classical models, the effectiveness of the M-C model in evaluating landslide stability under the dynamic changes of reservoir water level was verified. The results could provide a reliable scientific basis for improving the stability analysis and reinforcement measures of the accumulation landslide with the multi-circular slip surfaces in the TGR area, as well as can be applied to similar landslides in reservoir areas.

scholarly journals Stability analysis of geomagnetic baseline data obtained at Cheongyang observatory in Korea

2017 ◽  
Author(s):  
Shakirah M. Amran ◽  
Wan-Seop Kim ◽  
Heh Ree Cho ◽  
Po Gyu Park
Keyword(s):  
Stability Analysis ◽  
Temperature Effect ◽  
Temperature Variation ◽  
Absolute Measurement ◽  
Step Height ◽  
Fluxgate Magnetometer ◽  
Magnetic Noise ◽  
Periodic Modulation ◽  
The Stability

Abstract. The stabillity of baselines produced by Cheongyang (CYG) observatory from a period of 2014 to 2016 is analysed. Step height of higher than 5 nT were found in H and Z components in 2014 and 2015 due to magnetic noise in the absolute measurement hut. In addition, a periodic modulation behaviour observed in the H and Z baseline curves was related to temperature variation of about 20 °C in the fluxgate magnetometer hut. The quality of the baselines was improved by correcting the discontinuity in the H and Z baselines. Moreover, the stability of the both baselines was also improved by about 6 nT/year from 10 nT/year by performing the temperature effect correction.

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