On the stability of input-buffer cell switches with speed-up

2002 ◽  
Author(s):  
M. Ajmone Marsan ◽  
E. Leonardi ◽  
M. Mellia ◽  
F. Neri
Keyword(s):  
Input Buffer ◽  
Speed Up ◽  
Cell Switches ◽  
The Stability

scholarly journals Multibody model of fruit harvesting trucks: comparison with experimental data and rollover analysis

2018 ◽  
Vol 49 (2) ◽  
pp. 92-99 ◽  
Author(s):  
Stefano Melzi ◽  
Edoardo Sabbioni ◽  
Michele Vignati ◽  
Maurizio Cutini ◽  
Massimo Brambilla ◽  
...  
Keyword(s):  
Experimental Tests ◽  
Soil Stiffness ◽  
Safety Issues ◽  
Multibody Model ◽  
Centre Of Gravity ◽  
Rollover Risk ◽  
Speed Up ◽  
The Stability ◽  
Italian National Institute ◽  
Comparison With Experimental Data

Fruit harvesting trucks are used to easy and speed-up the work of agricultural operators. These vehicles are provided with a moving cargo bed, which can be raised up to 3 meters from the ground so that workers are closer to the plants top. Due to factors like height of centre of gravity and operation on soft and irregular soil, these vehicles present several safety issues. This research, carried out inside a project funded by INAIL (Italian National Institute for Insurance against Accidents at Work), analysed the stability of fruit harvesting trucks with particular focus on rollover risk. Experimental tests were carried out to characterise the response of these vehicles. Multibody models of two trucks were then developed and used to determine the rollover angle along a generic direction considering the effect of vehicle configuration and of tire-soil stiffness.

Stochastic resonance and stability for an ecological vegetation growth system driven by colored noises and multiplicative signal

2016 ◽  
Vol 30 (24) ◽  
pp. 1650308 ◽  
Author(s):  
Kang-Kang Wang ◽  
Ya-Jun Wang ◽  
Jian-Cheng Wu
Keyword(s):  
Stochastic Resonance ◽  
Multiplicative Noise ◽  
Signal To Noise Ratio ◽  
Periodic Signal ◽  
Expansion Process ◽  
Correlation Times ◽  
Vegetation Growth ◽  
Growth System ◽  
Speed Up ◽  
The Stability

In this paper, we investigate the steady-state properties and the transition rate for an ecological vegetation growth system induced by the terms of the colored multiplicative and additive noises. Numerical results indicate that the multiplicative noise and the additive one can reduce the stability of the ecological system and slow down the development velocity of the vegetation, while two noise self-correlation times can increase the stability of the system and speed up the expansion process of the vegetation system. With respect to the stochastic resonance (SR) phenomenon caused by noise terms and a multiplicative weak periodic signal, the results show that the additive noise always enhances the SR effect, two noise self-correlation time terms can produce SR phenomenon, but play opposite roles in enhancing or inhibiting the SR effect under different parameter conditions. In particular, the two self-correlation times can keep up the maximum of the signal-to-noise ratio (SNR) invariant in specific situations. Analogously, the multiplicative noise can not only improve the SNR, but also restrain the SR phenomenon in different cases.

Rotordynamic Behavior of 225 kW (300 HP) Class PMS Motor–Generator System Supported by Gas Foil Bearings

2015 ◽  
Vol 137 (9) ◽  
Author(s):  
Bok Seong Choe ◽  
Tae Ho Kim ◽  
Chang Ho Kim ◽  
Yong Bok Lee
Keyword(s):  
Axial Length ◽  
High Speed ◽  
Load Capacity ◽  
Stability Margin ◽  
Generator System ◽  
Thrust Bearings ◽  
Foil Bearings ◽  
Speed Up ◽  
The Stability ◽  
Stiffness And Damping

This paper presents the dynamic behavior of a 225 kW class (300 HP), 60,000 rpm, permanent magnet synchronous (PMS) motor–generator system supported on gas foil bearings (GFBs). The rotor of a 225 kW PMS motor is supported by two identical gas foil journal bearings (GFJBs) and one pair of gas foil thrust bearings (GFTBs). The total weight and axial length of the coupled rotors are 272 N and 1042 mm, respectively. During the speed-up test to 60,000 rpm, unexpected large subsynchronous rotor motions appear at around 120–130 Hz above 35,040 rpm. After disassembling the motor, an inspection of the top foils of the GFJBs reveals significant rotor rubbing. Thus, the GFJBs are redesigned to have a smaller load capacity by reducing their axial length to 45 mm. In addition, three 50 μm thick shims are installed in the GFJBs at 120 deg intervals for reducing the swirl speed of air and producing bearing preloads. The modification delays the onset speed of subsynchronous motions to 43,200 rpm and decreases the amplitude of the subsynchronous motions from 20 to 15 μm. These results indicate that the modification improves the stability margin of the high-speed rotor system with increasing stiffness and damping. In addition, the logarithmic decrement trends are in good agreement with the test results.

scholarly journals PROSPEK HUKUM ISLAM DI BIDANG PENGUATAN MONETER DENGAN PEMBERLAKUAN MATA UANG DINAR DAN DIRHAM

2018 ◽  
Vol 3 (2) ◽  
pp. 212
Author(s):  
Rahmat Fauzi
Keyword(s):  
Risk Sharing ◽  
Profit Sharing ◽  
Effective Demand ◽  
Demand For Money ◽  
Goods And Services ◽  
Speed Up ◽  
The Stability ◽  
Value Of Money

The limitation of the use of coins lies in its weight, so that since before Islam, in addition to the currency of the dinar and dirham, also apply to the trade papers and bonds (credit) for large commercial transactions. In running his government, at least the Prophet set nine policies in the field of monetary, among them are: First, let the currency of dinar and dirhams and trade notes and bonds payable. Second, the exemption of tariffs and import duties on imports of gold and silver and commodities from the Persian and Roman regions. Third, the prohibition of money accumulation (kanz). Fourth, the prohibition of stockpiling to maintain the stability of the value of money. Fifth, the prohibition of lending money (riba) which is run along with the prohibition of hoarding money (kanz) has accelerated the circulation of money directed to investment activities. Sixth, encourage interest-free loans (qardhul hasan) and profit sharing and risk sharing models. Seventh, prevent speculative activities. Eighth, increasing the production of goods and services. Ninth, the abolition of the trade monopoly of the Quraysh in Ukaz and Dul-Majaz markets after the conquest of Mecca. The removal of this monopoly improves the efficiency and distribution of better income. Effective demand and demand for money transactions increased so as to speed up the circulation of money.

scholarly journals Mechanics Parameter Optimization and Evaluation of Curtain Grouting Material in Deep, Water-Rich Karst Tunnels

2017 ◽  
Vol 2017 ◽  
pp. 1-12 ◽  
Author(s):  
Hai Shi ◽  
Mingzhou Bai ◽  
Shaochuan Xing
Keyword(s):  
Great Influence ◽  
Economic Losses ◽  
Wave Form ◽  
Engineering Construction ◽  
Grouting Material ◽  
Curtain Grouting ◽  
Speed Up ◽  
The Stability ◽  
Control Water

Mud and water often gush suddenly during the construction process of deep buried karst tunnels, which may cause serious accidents and result in major economic losses. Accordingly, for tunnels buried in deep rich water districts, discovering how to effectively control water gushing and ensure the stability of surrounding rock has great influence on the safety of engineering construction. The case study in this paper simulates the water-rich section of Dou-mo tunnel from Shanghai to Kunming of China. Numerical analysis was used to simulate the construction of the curtain grouting section and to evaluate the effects of the various curtain grouting parameters. The optimal grouting parameters were selected and then evaluated by applying them to the grouting method. The results show that (1) the grouting effect is the most notable one when the thickness of the grouting circle is outside the 4 m range of the tunnel contour. (2) In the same circle, the grouting quantity of the same ring is presented as a wave form. Therefore the number of the same ring grouting holes should reduce and increase the distance between the adjacent grouting holes appropriately to reduce the number of grouting holes and speed up the grouting progress.

scholarly journals Optimal Reliable Point-in-Polygon Test and Differential Coding Boolean Operations on Polygons

Symmetry ◽  
2018 ◽  
Vol 10 (10) ◽  
pp. 477
Author(s):  
Jianqiang Hao ◽  
Jianzhi Sun ◽  
Yi Chen ◽  
Qiang Cai ◽  
Li Tan
Keyword(s):  
Parallel Implementation ◽  
Dimensional Space ◽  
Three Dimensional ◽  
Geometric Probability ◽  
Boolean Operations ◽  
Straight Line ◽  
Speed Up ◽  
The Stability ◽  
Serial Algorithm ◽  
Degenerate Cases

This paper provides a full theoretical and experimental analysis of a serial algorithm for the point-in-polygon test, which requires less running time than previous algorithms and can handle all degenerate cases. The serial algorithm can quickly determine whether a point is inside or outside a polygon and accurately determine the contours of input polygon. It describes all degenerate cases and simultaneously provides a corresponding solution to each degenerate case to ensure the stability and reliability. This also creates the prerequisites and basis for our novel boolean operations algorithm that inherits all the benefits of the serial algorithm. Using geometric probability and straight-line equation F ( P ) = ( y i − y i + 1 ) ( x p − x i ) − ( y i − y p ) ( x i + 1 − x i ) , it optimizes our two algorithms that avoid the division operation and do not need to compute any intersection points. Our algorithms are applicable to any polygon that may be self-intersecting or with holes nested to any level of depth. They do not have to sort the vertices clockwise or counterclockwise beforehand. Consequently, they process all edges one by one in any order for input polygons. This allows a parallel implementation of each algorithm to be made very easily. We also prove several theorems guaranteeing the correctness of algorithms. To speed up the operations, we assign each vector a number code and derive two iterative formulas using differential calculus. However, the experimental results as well as the theoretical proof show that our serial algorithm for the point-in-polygon test is optimal and the time complexities of all algorithms are linear. Our methods can be extended to three-dimensional space, in particular, they can be applied to 3D printing to improve its performance.

scholarly journals Effects of Bonded Tyres on Leachate Recirculation of Bioreactor Landfills

2017 ◽  
Vol 11 (1) ◽  
pp. 552-562 ◽  
Author(s):  
Huijie Zhang ◽  
Jie Heng ◽  
Dongsheng Jeng ◽  
Haixia Xu
Keyword(s):  
Slope Stability ◽  
Momentum Balance ◽  
Bioreactor Landfill ◽  
Bioreactor Landfills ◽  
Leachate Recirculation ◽  
Local Factor ◽  
Outflow Rate ◽  
Speed Up ◽  
Stability Of Slope ◽  
The Stability

Introduction: In bioreactor landfills, leachate recirculation significantly influences the process of stabilization and the stability of slope. Method: To speed up the leachate recirculation and reduce its adverse impact on slope stability, this paper proposes a new method which constructs a spatial net consisted of bonded whole tyres in the municipal waste during landfilling. Results and Conclusion: In this study, a numerical two-permeability flow model was used to investigate the effects of tyres embedding on the outflow rate of leachate injection. Furthermore, it was coupled with momentum balance equations to determine the local factor of safety of slope stability. The established model was applied to a simplified bioreactor landfill. The simulation results demonstrated that the tyre net can accelerate the rate of leachate injection and contribute to distribute the liquid more uniformly. Meanwhile, the slope stability was improved due to the enforcement of waste in the presence of tyres.

scholarly journals High-Performance FPGA-Based BWA-MEM Accelerator

2021 ◽  
Vol 11 (3) ◽  
pp. 256-261
Author(s):  
Binh Kieu-Do-Nguyen ◽  
◽  
Cuong Pham-Quoc ◽  
Cong-Kha Pham
Keyword(s):  
High Performance ◽  
Optimization Methods ◽  
Entire System ◽  
Alignment System ◽  
Speed Up ◽  
Computing Platforms ◽  
The Stability ◽  
Dna Alignment ◽  
New Algorithms ◽  
The Ideal

There is no denying that Bioinformatics is one of the most important realms for our forthcoming development. As a demonstration of this fact, a plethora of new algorithms that were published over the last decade. Those significantly boost up the processes of biological analysis, especially for DNA alignment. Despite their undeniable contributions, it is still far more to state that DNA alignment has already achieved the ideal performance. In this work, we focus on the DNA alignment system which is based on our improved BWA-MEM algorithm that we have already published. Besides that, we also propose some optimization methods which was applied in order to improve the performance as well as the stability of our entire system. The system offers a speed-up by 46.52x when compared with the other computing platforms.

Study on Physical Characteristics and the Optimal Moisture Content Control Technology of Compacted Silt Subgrade

2013 ◽  
Vol 353-356 ◽  
pp. 2908-2912
Author(s):  
Lei Wu ◽  
Qing Ling Ju ◽  
Hong De Wang ◽  
Jian Qing Wu ◽  
Chao Li
Keyword(s):  
Moisture Content ◽  
Yellow River ◽  
Physical And Mechanical Properties ◽  
Control Technology ◽  
Water Control ◽  
Construction Period ◽  
Optimal Moisture Content ◽  
Speed Up ◽  
The Stability ◽  
Compaction Properties

Through field test, physical and mechanical properties, mechanical composition, characteristics and compaction properties of the Yellow River alluvial silt soil were analyzed. The result shows that silt inside air compaction was difficult to discharge due to the influence of soil particle composition and low content of clay. As a result, the uneven settlement deformation of subgrade is obvious and the stability of silty soil water is not enough. The rainfall is frequent. Moisture content of soil is too high. It is difficult to dry field soil. The construction period is short. In order to speed up the pace of construction, we proposed the over-wet silt optimal multiple water control technology.

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