On a Type of Automatically Interrupted Triode Oscillations

1930 ◽  
Vol 26 (2) ◽  
pp. 236-251
Author(s):  
J. A. Ratcliffe ◽  
L. G. Vedy
Keyword(s):  
Time Constant ◽  
Linear Resistance ◽  
Non Linear

A type of automatically interrupted triode oscillations is described which depends on the interaction between an oscillating triode circuit and. a circuit containing a non-linear resistance and a time-constant device. The theory of the circuit is developed and tested experimentally by means of oscillograms. The theory of the rise and decay of currents in a circuit containing an inductance and a non-linear resistance is dealt with in an appendix.

Memristor Oscillators and its FPGA Implementation

2011 ◽  
Vol 383-390 ◽  
pp. 6992-6997 ◽  
Author(s):  
Ai Xue Qi ◽  
Cheng Liang Zhang ◽  
Guang Yi Wang
Keyword(s):  
Numerical Simulation ◽  
Chaotic System ◽  
Field Programmable Gate Array ◽  
Chaotic Attractor ◽  
Hardware Implementation ◽  
Fpga Implementation ◽  
Experimental Results ◽  
Linear Resistance ◽  
Non Linear ◽  
Field Programmable

This paper presents a method that utilizes a memristor to replace the non-linear resistance of typical Chua’s circuit for constructing a chaotic system. The improved circuit is numerically simulated in the MATLAB condition, and its hardware implementation is designed using field programmable gate array (FPGA). Comparing the experimental results with the numerical simulation, the two are the very same, and be able to generate chaotic attractor.

scholarly journals Selecting Ultracapacitors for Smoothing Voltage Deviations in Local Grids Fed by Transformer with Tap-Changer and Distributed PV Facilities

Electronics ◽  
2019 ◽  
Vol 8 (3) ◽  
pp. 357 ◽  
Author(s):  
Oz Sorkin ◽  
Eliyahu Farber ◽  
Moshe Averbukh
Keyword(s):  
Time Constant ◽  
Power Plants ◽  
Numerical Procedure ◽  
Voltage Regulation ◽  
Solar Irradiation ◽  
Approximation Procedure ◽  
Non Linear ◽  
Low Pass ◽  
Linear Circuits ◽  
Selection Of

Widespread use of photovoltaic (PV) small and middle-power plants close or inside existing townships and villages may cause significant deviations of the grid voltage. Owing to the oscillation of solar irradiation and corresponding power flows these voltage instabilities can damage equipment and must be prevented. Designated for the voltage regulation tap-changers in distribution transformers located in a significant distance of such settlements have a sluggish response time. As a possible answer for their delay is the smoothing energy of flows in PV power installation by intermittent capacitor low-pass filtering (LPF) located near those PV facilities. The application of ultracapacitors (UC) for LPF is remarkable due to their sustainability and relatively low costs of energy storage. The parameters selection of such appliances is a well-designed procedure for linear circuits. However, DC–AC inverters in PV facilities are represented by a power (instead of a voltage) source. As a result, the total circuit including such LPF becomes a non-linear and its transient process and consequently, its efficiency is difficult to assess requiring each time of development the UC storage an application complex numerical procedure. Engineers are usual to work with linear circuits that are describing fine by a time constant is designated as a multiplication of a capacitance times load equivalent resistance. In the case of PV DC–AC inverters, such an approach can be applied as well but a value of a time constant should be corrected. Considering a significant cost of UC storage, the non-optimal selection of a correcting coefficient may cause considerable loses. Submitted in the presented article is an original approximation procedure giving an efficiently approachable technique to select correcting coefficient for describing non-linear dynamic process by its linear analog. This way the development low-pass UC filtering in electrical systems with PV plants becomes more efficient and simpler task.

scholarly journals Non-Linear Resistance Training Program Induced Power and Strength but Not Linear Sprint Velocity and Agility Gains in Young Soccer Players

Sports ◽  
2018 ◽  
Vol 6 (2) ◽  
pp. 43 ◽  
Author(s):  
Matheus Barbalho ◽  
Paulo Gentil ◽  
Rodolfo Raiol ◽  
Fabrício Del Vecchio ◽  
Rodrigo Ramirez-Campillo ◽  
...  
Keyword(s):  
Resistance Training ◽  
Training Program ◽  
Soccer Players ◽  
Resistance Training Program ◽  
Linear Resistance ◽  
Non Linear ◽  
Sprint Velocity

scholarly journals Strength and Power Changes During an In-season Resistance Training Program for Male CIS Volleyball Players

2015 ◽  
Vol 1 (2) ◽  
Author(s):  
Doug Hillis ◽  
Matthew Okrainec
Keyword(s):  
Resistance Training ◽  
Vertical Jump ◽  
Squat Jump ◽  
Vertical Jump Height ◽  
Linear Resistance ◽  
Body Strength ◽  
Non Linear ◽  
Volleyball Players ◽  
Jump Power ◽  
Lower Body Strength

Previous research has indicated that performing repetitions to failure at greater than 80% one repetition max (1 RM) one day per week using a non-­‐linear training program can maintain strength and power in many athletic populations. However, this finding has not been directly assessed in male university volleyball players. The purpose of this study was to determine if non-­‐linear training two days a week could maintain upper and lower body strength, and vertical jump power and height over the course of a competitive volleyball season, measured at three time points. Eleven trained Canadian Interuniversity Sport (CIS) male athletes were a part of a single training group which completed a maintenance program consisting of non-­‐linear training for 17 weeks. At each testing time point, the participants completed a bench press, squat, squat jump, countermovement jump, and three step jump and reach. We predicted that non-­‐linear resistance training of mixed intensities twice a week would allow players to maintain strength, vertical jump power, and vertical jump height. Results indicated that upper body strength can be maintained over the course of a competition period with non-­‐linear resistance training (p = 0.043). Scores for lower body strength, vertical jump squat jump power, vertical jump countermovement jump power, and vertical jump height increased over the course of the season (p's < 0.001, 0.14, 0.181, and 0.006, respectively). Our results indicate that male volleyball players can benefit from non-­‐linear training to maintain or improve performance when training at > 80% 1 RM to failure once a week during a competition season. 

scholarly journals Non-linear effects in the oscillating drop method for viscosity measurements

2020 ◽  
Vol 48 (3) ◽  
pp. 253-277 ◽  
Author(s):  
RAINER K. WUNDERLICH ◽  
MARKUS MOHR
Keyword(s):  
Time Constant ◽  
Space Station ◽  
Surface Oscillation ◽  
Temperature Dependent Viscosity ◽  
Temperature Range ◽  
Drop Method ◽  
Sample Shape ◽  
Decay Times ◽  
Non Linear ◽  
Oscillation Decay

The contribution of non-linear fluid flow effects to the damping of surface oscillations in the oscillation drop method was investigated in a series of experiments in an electromagnetic levitation device installed on the International Space station, ISS-EML. In order to correctly evaluate the damping time constant from measured surface oscillation decays the effect of a modulated signal response on measured surface oscillation decay curves was investigated. It could be shown that various experimentally observed signal patterns could be well represented by a modulated response. The physical origin of such modulations is seen in rotation and precession. Over a temperature range of 220 K covered by different surface oscillation excitation pulses with an initial sample shape deformation of 5 – 10% the amplitude of surface oscillations as a function of time could be very well represented by a Lamb type damping with a temperature dependent viscosity. A direct comparison of surface oscillation decay times measured in the same temperature range but for different oscillation amplitudes showed no non-linear contribution to the damping time constant with a confidence level better 10%.

Influence of shear modulus and drift capacity on non-linear static analysis of masonry buildings

2019 ◽  
Author(s):  
Maria Luisa Beconcini ◽  
Paolo Cioni ◽  
Pietro Croce ◽  
Paolo Formichi ◽  
Filippo Landi ◽  
...  
Keyword(s):  
Shear Modulus ◽  
Static Analysis ◽  
Seismic Performance ◽  
Nonlinear Static Analysis ◽  
Masonry Buildings ◽  
Drift Capacity ◽  
Linear Resistance ◽  
Non Linear ◽  
Definition Of

<p>In nonlinear static analysis of masonry buildings, the hysteric behaviour of masonry walls is commonly idealized through a bi-linear resistance envelope defined by the lateral stiffness of the wall, the ultimate shear resistance and the ultimate inter-storey drift. Therefore, it becomes fundamental to properly set the modulus of elasticity and shear modulus for masonry as well as to properly evaluate the drift capacity of the walls.</p><p>In the paper, the combined influence of shear modulus and drift capacity definition on the assessment of seismic performance of masonry buildings is investigated in details by means of a simplified non-linear pushover type algorithm developed by the authors. In particular, two different definitions are considered for the drift capacity, in terms of ductility and in terms of percentage of the inter-storey height, while for the shear modulus a reasonable set of values is investigated according a database collected combining masonry test results available in the relevant scientific literature with an in situ experimental campaign carried out by the authors.</p><p>The results show how the variation in shear modulus can lead to conflicting outcomes for the evaluation of seismic performance of masonry buildings depending on the assumed definition of drift capacity.</p>

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