The Stability and Management of “Sandwich” Type Slopes in Extrusive Rock Area

2012 ◽  
Vol 472-475 ◽  
pp. 1253-1256
Author(s):  
Hong Wei ◽  
Hong Wang
Keyword(s):  
Hainan Island ◽  
Soil Layers ◽  
Loose Soil ◽  
Late Tertiary ◽  
Sandwich Type ◽  
Extrusive Rock ◽  
Management Method ◽  
The Stability ◽  
Faulted Zone ◽  
Poor Stability

Northern area of Hainan Island is located in the south of Leiqiong faulted zone; new tectonic movement and volcanic activity have intense since late tertiary. Cenozoic volcano in the region is developed, various types of extrusive rocks widely distributed which often directly cumulate on the Cenozoic sedimentary soil layers, then covered by more loose soil, form a soft - hard - soft “sandwich” type slope with a poor stability. Based on the study of this slope and simulate its stability, this paper proposed this kind of slope's destruction mechanism as well as the management method

scholarly journals Renovation Management Method in Neglected Buildings

2021 ◽  
Vol 13 (2) ◽  
pp. 929
Author(s):  
Beata Nowogońska ◽  
Magdalena Mielczarek
Keyword(s):  
Decision Making ◽  
Technical Condition ◽  
Irreversible Processes ◽  
Management Method ◽  
The Stability ◽  
Motivating Factor ◽  
Decision Making Support

Renovation works to buildings are often not carried out or there are shifts in time, which causes degradation of the building. The article presents an analysis of the consequences of abandoning renovation works. The aim of this article is to present a method of preliminarily planning renovations of a MRUB (Managing Renovation in Un-renovated Buildings). This method of decision-making support is based on the consequences in the case of the omission of renovations. The omission of renovations may lead to a threat to the stability of the building’s structure, threaten the lives of its users, and further damage the building by damaging further elements, or even cause a building disaster. Often, as a result of the abandonment of renovation, usually caused by the lack of the owner, improper manager, or irresponsible owners, these objects are degraded. The consequences of the failure of renovating buildings lead to irreversible processes of destruction. As a result of the research, it was found that it was not only a bad technical condition that was a prerequisite for carrying out the renovation. The consequences of the absence of renovation works, in addition to the technical condition, should be a motivating factor. The problem of the abandonment of renovations is presented using the example of the palace in Drwalewice.

Sensitivity Analysis and Numerical Stability Analysis of the Algorithms for Predicting the Performance of Turbines

2014 ◽  
Vol 136 (9) ◽  
Author(s):  
Ming Wei ◽  
Yonghong Wang ◽  
Huafen Song
Keyword(s):  
Numerical Stability ◽  
Rounding Error ◽  
One Dimensional ◽  
Flow Models ◽  
Numerical Stability Analysis ◽  
Last Stage ◽  
The Stability ◽  
Performance Calculation ◽  
Poor Stability ◽  
Input Error

Sensitivity and numerical stability of an algorithm are two of the most important criteria to evaluate its performance. For all published turbine flow models, except Wang method, can be named the “top-down” method (TDM) in which the performance of turbines is calculated from the first stage to the last stage row by row; only Wang method originally proposed by Yonghong Wang can be named the “bottom-up” method (BUM) in which the performance of turbines is calculated from the last stage to the first stage row by row. To find the reason why the stability of the two methods is of great difference, the Wang flow model is researched. The model readily applies to TDM and BUM. How the stability of the two algorithms affected by input error and rounding error is analyzed, the error propagation and distribution in the two methods are obtained. In order to explain the problem more intuitively, the stability of the two methods is described by geometrical ideas. To compare with the known data, the performance of a particular type of turbine is calculated through a series of procedures based on the two algorithms. The results are as follows. The more the calculating point approaches the critical point, the poorer the stability of TDM is. The poor stability can even cause failure in the calculation of TDM. However, BUM has not only good stability but also high accuracy. The result provides an accurate and reliable method (BUM) for estimating the performance of turbines, and it can apply to all one-dimensional performance calculation method for turbine.

Influence of peripheral substituents on the stability of sandwich-type complexes of crown ether-containing anthraquinoneimines

2018 ◽  
Vol 30 (11) ◽  
pp. 918-928
Author(s):  
Timofey P. Martyanov ◽  
Aleksandra A. Kudrevatykh ◽  
Igor G. Strelnikov ◽  
Lubov S. Klimenko ◽  
Denis V. Korchagin ◽  
...  
Keyword(s):  
Crown Ether ◽  
Sandwich Type ◽  
The Stability

A Buoyancy and Stability Mechanism for Underwater Vehicles

2000 ◽  
Vol 34 (2) ◽  
pp. 22-25
Author(s):  
Manikoth Aravindakshan
Keyword(s):  
Underwater Vehicles ◽  
Design Parameters ◽  
Vehicle Design ◽  
Hydraulic Power ◽  
Water Seepage ◽  
The Stability ◽  
Negative Buoyancy ◽  
Activation Depth ◽  
Poor Stability

This paper describes the design of a simple, inexpensive but effective ‘detach weight’ device that can aid in the stability as well as the recovery of underwater vehicles and unpropelled consoles. If the vehicle attempts to cross the maximum specified sea depth due to water seepage, poor stability, failure of normal recovery schedule, or inherent negative buoyancy as that of a console, then the proposed mechanism gets activated to achieve terminal buoyancy. Non-reliance on electrical, pneumatic or hydraulic power and sensors distinguish the device from conventional ballasting methods. Insitu assembly and adjustments of activation depth and weight can add flexibility to the vehicle design parameters such as overall CG, weight, trim, list etc.

Recent Progress in Black Phosphorus Sensors

2020 ◽  
Vol 16 (7) ◽  
pp. 1045-1064
Author(s):  
Tingting Ma ◽  
Hao Huang ◽  
Wenfei Guo ◽  
Chuanxiang Zhang ◽  
Zhu Chen ◽  
...  
Keyword(s):  
Carrier Mobility ◽  
Electrochemical Sensors ◽  
Black Phosphorus ◽  
Synthesis Methods ◽  
Tunable Bandgap ◽  
High Carrier Mobility ◽  
High Carrier ◽  
The Stability ◽  
New Sensors ◽  
Poor Stability

Black phosphorus (BP) is a new two-dimensional material with many unique properties, such as great biocompatibility, excellent surface activity, high carrier mobility, and tunable bandgap. Black phosphorus has been particularly attractive in sensor. However, black phosphorus isolated by traditional methods is easily oxidized and degraded by air, with poor stability, which limits its application as sensors. The modification and functionalization of black phosphorus enhance the stability, sensitivity, selectivity and biocompatibility of its application in sensor. This review describes recent progresses in sensor based on black phosphorus (2016–2020). Firstly, the structure and properties, synthesis methods, modification and functionalization of black phosphorus are briefly described. Then, the advancements in designing of various sensors based on black phosphorus are systematically provided, with a specific focus on electrochemical sensors, electrochemiluminescence sensors and photoelectrochemical sensors. Finally, latest challenges and further opportunities for developing new sensors with black phosphorus nanomaterial are discussed.

Analysis of the Stability of Current Mode PWM DC/DC Converter

2011 ◽  
Vol 143-144 ◽  
pp. 809-814
Author(s):  
Xiao Qiang Jia
Keyword(s):  
Duty Cycle ◽  
Current Mode ◽  
Compensation Circuit ◽  
The Poor ◽  
Slope Compensation ◽  
The Stability ◽  
Poor Stability

To address the poor Stability of current mode PWM DC / DC converter when duty cycle [5] is greater than 50%, by analyzing the converter, the design.of appropriate slope compensation circuit is given. And by Comparing the experimental waveform through simulation, it can effectively solve the converter poor stability and interference.of noise, if the slope compensation is appropriate.

Deformation and Failure Characteristics of Embankment upon the Slope in Permafrost Area under Different Foundation Slope

2013 ◽  
Vol 353-356 ◽  
pp. 905-910
Author(s):  
Qian Su ◽  
Jun Jie Huang ◽  
Bao Liu ◽  
Yu Jie Li
Keyword(s):  
Failure Modes ◽  
Centrifuge Modeling ◽  
Experimental Conditions ◽  
Soil Layers ◽  
Deformation And Failure ◽  
Geotechnical Centrifuge ◽  
Gravity Load ◽  
Unstable Failure ◽  
Thawing Depth ◽  
The Stability

To investigate the effect of foundation slope on stability of embankment upon the slope in permafrost area, 3 groups of model tests with different foundation slope are designed using the mechanical similarity based on geotechnical centrifuge modeling, when the freezing-thawing depth of the embankment reaches the greatest. The results show that: (1) The foundation slope has effect on the stability of the embankment. The deformation mainly concentrates on the soil layers above the freezing-thawing interface, and the deformation mutation point takes place at the freezing-thawing interface. (2) According to fracture characteristics and failure severity of the embankment, failure modes can be divided into the cracking failure in shallow layer and in deep layer. (3) The cause of unstable failure is the deficiency of shear resistance strength of the weak belt, the soil layers above the freezing-thawing interface slips along the freezing-thawing interface under gravity load. (4) Under the experimental conditions, the critical value of the foundation slope influencing on the stability of the embankment is about 1:6 when the height of the slope embankment is 5.0 m.

Flight Dynamic Characteristic Analysis of a Generic Airbreathing Hypersonic Vehicle

2014 ◽  
Vol 716-717 ◽  
pp. 724-729 ◽  
Author(s):  
Rui Guang Yang ◽  
Jian Qiao Yu ◽  
Yuan Chuan Shen
Keyword(s):  
Dynamic Characteristic ◽  
High Speed ◽  
Complex Dynamics ◽  
Equations Of Motion ◽  
Hypersonic Vehicle ◽  
Propulsion System ◽  
Characteristic Analysis ◽  
The Stability ◽  
Dynamics Characteristic ◽  
Poor Stability

Because of the high speed, strong coupling between aerodynamics and propulsion system, complex environmental conditions and new propulsion system, the airbreathing hypersonic vehicles have a complex dynamics characteristic. This paper use the generic hypersonic vehicle model (CSULA-GHV) to research this issue. The nonlinear longitudinal equations of motion are linearized based on the assumption of little perturbation. Analyze the dynamic characteristic on a feature point selected. The results show that, the stability of this model is poor. It has to design an efficient controller to adjust the poor stability.

scholarly journals Influence of Electron-Donating Substituents on the Stability of Sandwich-Type Complexes of Crown-Containing Anthraquinoneimines

2020 ◽  
Vol 13 (1) ◽  
pp. 55-63
Author(s):  
Aleksandra A. Kudrevatykh ◽  
Timofey P. Martyanov ◽  
Evgeny N. Ushakov ◽  
Alexander V. Chernyak ◽  
Lubov S. Klimenko
Keyword(s):  
Sandwich Type ◽  
The Stability

scholarly journals Computational analysis on the stability and characteristics of partially premixed butane air open flames in tubular burner

2021 ◽  
pp. 320-320
Author(s):  
Zeenathul Abdul Gani ◽  
N. Muthu Saravanan
Keyword(s):  
Computational Study ◽  
Flame Temperature ◽  
Diffusion Mode ◽  
Partially Premixed Combustion ◽  
Stable Operating ◽  
Partially Premixed ◽  
Lift Off ◽  
The Stability ◽  
And Diffusion ◽  
Poor Stability

Partially premixed combustion is one of the developing areas of combustion research that has the advantages of both premixed and diffusion mode of combustion. The present work involves a computational study on the stability and characteristics of partially premixed butane-air flames. The effect of operating parameters like fuel-air ratio, primary aeration, and the presence of co-flow and co-swirl on the stability and flame characteristics has been studied. The simulation results show that the height of the flame decreases with an increase in primary aeration and also in the presence of a co-swirl stream. It has also been found that the stability of flames increases with co-swirl air but deteriorates with the presence of the co-flow air. The flame temperature increases with primary aeration and it has been observed that the peak flame temperature shifts away from the burner mouth for lower primary aeration. It has been observed that the flame stability improves with co-swirl air which is attributed to the recirculation zone created due to the swirl motion which acts as a heat source. The poor stability in the presence of co-flow air is attributed to flame stretching and aerodynamic quenching of the stretched flame lets. The lift off velocity and the stable operating range increases with equivalence ratio and also with co-swirl air.

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