scholarly journals Experimental Study of the Chaotic Jerk Circuit Application for Chaos Shift Keying

2021 ◽  
Vol 58 (4) ◽  
pp. 55-68
Author(s):  
F. Capligins ◽  
A. Litvinenko ◽  
A. Aboltins ◽  
E. Austrums ◽  
A. Rusins ◽  
...  
Keyword(s):  
Experimental Study ◽  
Voltage Drop ◽  
Experimental Studies ◽  
Chaotic Synchronization ◽  
Channel Noise ◽  
Error Feedback ◽  
Shift Keying ◽  
The Stability ◽  
Chaos Shift Keying ◽  
The Impact

Abstract The paper presents a study of the chaotic jerk circuit (CJC) employment capabilities for digital communications. The concept of coherent chaos shift keying (CSK) communication system with controlled error feedback chaotic synchronization is proposed for a specific CJC in two modifications. The stability of chaotic synchronization between the two CJCs was evaluated in terms of voltage drop at the input of the slave circuit and the impact of channel noise using simulations and experimental studies.

scholarly journals An Experimental Study to Evaluate the Impact of the Programming Paradigm in the Testing Activity

2012 ◽  
Vol 15 (1) ◽  
Author(s):  
Simone de Rocio Senger de Souza ◽  
Marllos Paiva Prado ◽  
Ellen Francine Barbosa ◽  
José Carlos Maldonado
Keyword(s):  
Experimental Study ◽  
Experimental Studies ◽  
Programming Paradigm ◽  
Time Restrictions ◽  
Activity Cost ◽  
The Cost ◽  
Programming Paradigms ◽  
The Impact ◽  
Initial Results ◽  
Testing Criteria

Several techniques and criteria are available to help conducting testing activity. The choice for one of them depends on different aspects, such as the time restrictions, ef- fectiveness of the testing criteria or the features of the program under test. In this context, the programming paradigm might influence in the testing activity cost. This paper presents the results of an experimental study to characterize and evaluate the cost and strength of structural and functional testing criteria, comparing object-oriented and procedural programming paradigms. A set of 32 programs from the data structure do- main was considered in this study. The main goals in the execution of this research were: i) to obtain initial results about the investigated questions; ii) to generate artifacts which can be used as basis to define and conduct further experimental studies; iii) to support training and teaching of software testing activity.

scholarly journals Experimental study of flexural-torsional deformations and stability of curved elements of steel arches with l-shaped cross-section

2020 ◽  
Vol 17 (1) ◽  
pp. 94-99
Author(s):  
D. V. Urazgildeev ◽  
Keyword(s):  
Experimental Study ◽  
Cross Section ◽  
Theoretical Study ◽  
Experimental Studies ◽  
Limit Loads ◽  
The Core ◽  
Core Elements ◽  
The Stability ◽  
Curved Elements ◽  
Shaped Cross Section

The method and results of experimental studies of flexural and torsional displacements, as well as the stability of curved elements of steel arches with I-shaped cross-section are presented.The author presents graphs of the dependence of flexural-torsional movements on the load for three different loading schemes obtained during the experiment. The limit loads on the core elements of the arches were obtained. The results of the experiment were compared with the theoretical study.

scholarly journals IMPROVEMENT OF THE STRUCTURAL LAYOUT OF POTATO PLANTERS’ COULTER GROUP

2021 ◽  
pp. 81-90
Author(s):  
Alexey Semenovich Dorokhov ◽  
Andrey Grigoryevich Ponomarev ◽  
Vitaly Nikolaevich Zernov ◽  
Sergey Nikolaevich Petukhov ◽  
Alexander Gennadievich Aksenov ◽  
...  
Keyword(s):  
Experimental Studies ◽  
Acute Angle ◽  
Sharp Angle ◽  
Maximum Extent ◽  
Automatic Maintenance ◽  
Potato Planter ◽  
Growing Conditions ◽  
The Stability ◽  
The Impact

Structural layouts of coulters and their groups in potato planters are justified in the article based on the morphological features of the potato plant, its requirements for growing conditions and ensuring the quality of the planting process. The purpose of coulter groups is to form a bed for placing tubers with a loose layer of soil in 5-8 cm and sealing them with loosened soil to a certain depth. To substantiate the type of potato planter coulters that meet the requirements for potato growing conditions to the maximum extent possible, optimize the parameters of coulter groups that automatically ensure the stability of the coulter travel depth when imitating irregularities of the field microrelief. A comparative analysis of the impact on the soil of the most common anchor coulters with a blunt angle of soil entry and a sharp angle with an individual floating suspension is given, and indicators of the quality of their operation are described. It was found that coulters with an individual floating suspension and an acute angle of soil entry meet the requirements for potato growing conditions to the maximum extent possible. In order to ensure travel stabilization of such a coulter at a given depth when imitating field irregularities, a version of the coulter group has been developed that provides automatic correction of the coulter's angle of attack when changing its travel depth. Experimental studies have optimized the parameters of the coulter suspension that ensure automatic imitation of field microrelief irregularities up to 20 cm deep within the initial requirements for potato planting machines. Coulters with an individual floating suspension and a sharp angle of soil entry most fully meet the requirements for potato growing conditions to the maximum extent possible. A coulter group with a suspension aspect ratio of 150:200:400:400 cm and an acute angle of coulter entry into the soil provides automatic maintenance of the set coulter travel depth within the initial requirements (±2 cm) for irregularities in the field microrelief of up to 200 mm. In this case, the bottom and walls of the furrow are not compacted.

scholarly journals Evaluation of the potential of commercial use of microalgae in the world and in Ukraine

2020 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Lesia Pavliukh ◽  
Sergii Shamanskyi ◽  
Sergii Boichenko ◽  
Artur Jaworski
Keyword(s):  
Experimental Study ◽  
Wastewater Treatment ◽  
Experimental Studies ◽  
Biofuel Production ◽  
Phosphorus Compounds ◽  
Commercial Application ◽  
Biogenic Elements ◽  
Content Type ◽  
Commercial Use ◽  
The Impact

Purpose This paper aims to evaluate of the microalgae potential for commercial application, in particular to conduct experimental study of biogenic compounds removal from sewage waters by microalgae, and to calculate economical benefits from biofertizers and biofuel production. Design/methodology/approach Experimental study in the concentration change of nitrogen and phosphorus compounds in the cultivation of Chlorella Vulgaris microalgae in various types of sewage water was carried out. Findings The efficiency wastewater treatment by microalgae was confirmed. The economic benefit from the biomass utilization as biofuel production was calculated. Practical implications Implementation of wastewater treatment technology with biomass recycling for biofuel and biofertilizers production will minimize the impact on the environment. Originality/value As a results of experimental studies, the ability of microalgae to reduce biogenic elements in wastewater was confirmed. Microalgae can be used both for wastewater treatment to biogenic elements removal, such as phosphorous and nitrogen compounds, and biofuel, biofertilizers production. Prospects of the commercial use of microalgae are obvious. They are specially adapted to an environment dominated by viscous forces.

scholarly journals Analysis and Design of Network-Based Control Systems with Binary Modulation

2014 ◽  
Vol 2014 ◽  
pp. 1-7
Author(s):  
Shunli Zhao ◽  
Xunhe Yin ◽  
Xueye Wei
Keyword(s):  
Control Systems ◽  
Signal To Noise Ratio ◽  
Channel Noise ◽  
Linear Matrix ◽  
Computer Communication ◽  
Analysis And Design ◽  
The Past ◽  
Binary Modulation ◽  
Shift Keying ◽  
The Stability

Network-based control systems have been emerging technologies in control and computer communication fields over the past decade. This paper focuses on the analysis and design of network-based control systems with binary modulation. First, it is shown that different modulations can result in different delays which are inevitable in network-based control systems. The delay can be seen as constant delay when the transmission time is the main consideration. Second, channel noise can result in bit error while bit error is seen as active packet loss in this paper, in this context, the conditions of signal-to-noise ratio (SNR) for binary modulation that can guarantee the stability of systems are obtained according to the proposed algorithm. Third, the system with delay and noisy communication can be modeled as an asynchronous dynamic system (ADS); in addition, the stability is analyzed and controller is designed in terms of Lyapunov function and linear matrix inequality (LMI) scheme. Finally, without loss of generality, numerical simulation demonstrates the effectiveness of the proposed scheme and designed controller based on binary amplitude shift keying (2ASK) modulation.

Numerical and Experimental Study of a Crash Absorption Keel

2007 ◽  
Vol 348-349 ◽  
pp. 953-956
Author(s):  
Chiara Colombo ◽  
Laura Vergani ◽  
Nino Ascone Modica
Keyword(s):  
Finite Element Method ◽  
Experimental Study ◽  
Experimental Studies ◽  
The Finite Element Method ◽  
State Of Stress ◽  
Design Analyses ◽  
The Impact ◽  
Sailing Boat ◽  
System Geometry ◽  
Made In

Aim of this paper is to study the impact between the sailing boat keel and the ground and to look for the optimal configuration of the bulb-keel-hull system able to direct the damage in the bulb-keel zone avoiding the hull region. The research, which is carried out in collaboration with Wally shipyard, requires firstly an accurate investigation of the bulb-keel-hull system geometry, of the boat inertial properties and of the impact condition. Secondly, a numerical dynamic analysis by means of the finite element method allows to model the impact and to determine how, during the collision, the state of stress varies and how the kinetic energy is absorbed/dissipated. Starting from these results, the performance of the present configuration is evaluated in several conditions and some proposals for new design configuration are made. In particular the results carried out from the new design analyses were evaluated comparing themselves to results obtained from experimental studies.

Investigation of Engine Distortion Interaction

2016 ◽  
Author(s):  
Fabian Wartzek ◽  
Heinz-Peter Schiffer ◽  
Jakob P. Haug ◽  
Reinhard Niehuis ◽  
Martin Bitter ◽  
...  
Keyword(s):  
Numerical Models ◽  
Experimental Studies ◽  
Stability Limit ◽  
Analytical Models ◽  
Test Case ◽  
Transonic Compressor ◽  
Numerical Studies ◽  
Small Distortion ◽  
The Stability ◽  
The Impact

Inflow distortions in the compression system of a jet engine are becoming increasingly important for research focus. The investigation of the emergence of a distortion, its interaction with the rotor and the resulting impact on the rotor flow is challenging. In this work a separation in the inflow of a transonic compressor was created and the impact on stage aerodynamics investigated. The separation resulted in a total pressure distortion close to the casing within a sector of 120°. Effects were studied both numerically and experimentally in a joint collaboration project. The numerical model consisted of the full rotor-stator compressor stage, the inlet duct and the distortion generator upstream of the stage. This enables both an accurate validation of the numerical results and contributes to a deeper understanding of the flow. The results of both the numerical and experimental studies were in good agreement. The rotor is locally throttled by the inlet separation, resulting in the formation of an additional loss core at the stability limit due to a local aerodynamic overload. Considering classic distortion descriptors like the DC60, it is shown that they are not able to adequately assess the impact of a strong, but small distortion close to the tip of the rotor. The data can be considered as test case for future numerical models as well as for the validation of new analytical models. Furthermore, the results of this study reveal effects in both experimental and numerical studies that would not be realized if only a model of the separation was analyzed.

A Noise Eliminating Method of DCSK System Based on Multi-Layered Noise Control Materials

2012 ◽  
Vol 461 ◽  
pp. 164-168
Author(s):  
Zhen Chao Wang ◽  
Shi Bing Zhang ◽  
Yuan Yuan Liu
Keyword(s):  
Communication Systems ◽  
Colored Noise ◽  
Low Voltage ◽  
Reversed Phase ◽  
Channel Noise ◽  
Power Line Communication ◽  
Shift Keying ◽  
Communication Scheme ◽  
Simulation Results ◽  
Chaos Shift Keying

This paper proposes a new chaotic communication scheme which is developed from Differential Chaos Shift Keying (DCSK), named reversed-phase overlay DCSK. Different from DCSK, at the receiver of the improved scheme the first and the second half-symbol signals within a code period are reversed-phase overlapped before the correlation operation. Both the theoretical analysis and the simulation results show that the proposed scheme can effectively suppress the noise and improve the BER performance of DCSK if the channel noise in the first half of a code period and the second is positively correlated. The proposed scheme can be applied to the communication systems suffering with colored noise, such as Low-voltage Power Line Communication(L-PLC) system

An Experimental Study on the Impact on Vari-Speed Milling to the Capacity Machine Tool

2011 ◽  
Vol 188 ◽  
pp. 648-651
Author(s):  
Xiao Qiang Xue ◽  
Ning He ◽  
Liang Li ◽  
Wei Zhao ◽  
Qi Wang
Keyword(s):  
Experimental Study ◽  
Comparative Analysis ◽  
Machine Tool ◽  
Proper Time ◽  
Constant Speed ◽  
Cutting Depth ◽  
Stability Lobes ◽  
Parameters Selection ◽  
The Stability ◽  
The Impact

The axial limit cutting depth(LCD) of constant speed were studied, and the stability lobes were gotten by expriments and simulation. The vari-speed milling selected various parameters was investigated by expriments,also.The experimental results show that varying speed milling approach improves the limit cutting depth on proper time and prope parameters selection. According to the comparative analysis of the exprimental results of constant speed and vari-speed milling, it was obtained whether the varying speed milling approach was to be chosen and how to select proper parameters, should be reference to the stability lobes of constant speed.

An experimental study on the impact of the rear track width on the stability of agricultural tractors using a test bench

2011 ◽  
Vol 48 (4) ◽  
pp. 319-323 ◽  
Author(s):  
I. Gravalos ◽  
T. Gialamas ◽  
S. Loutridis ◽  
D. Moshou ◽  
D. Kateris ◽  
...  
Keyword(s):  
Experimental Study ◽  
Test Bench ◽  
Track Width ◽  
Agricultural Tractors ◽  
The Stability ◽  
The Impact
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