scholarly journals Influence of the radiation pattern errors for the correlation interferometer

2021 ◽  
Vol 2094 (2) ◽  
pp. 022054
Author(s):  
A A Fateev ◽  
A B Tokarev ◽  
O V Chernoyarov ◽  
A V Salnikova
Keyword(s):  
Radiation Pattern ◽  
Reference Model ◽  
Positive Influence ◽  
Directional Antenna ◽  
Phase Correlation ◽  
Computation Procedure ◽  
Correlation Interferometer ◽  
The Stability

Abstract While designing phase-correlation direction finders, as antenna components, the non-directional ones are usually applied. Mounting the non-directional antenna components provides certain new options but makes the bearing computation procedure more problematic. In the present paper, the feasibility of using the directional antenna components is discussed and confirmed in terms of its positive influence on the stability of the bearing results in the case when the deviations of the implementations of the actual diagrams of the antenna components from their reference model occur.

scholarly journals Numerical Modelling of The Behavior of Tunnel in Soft Surrounding Rock. A Case Study of Djebel El-Ouahch Tunnel, Algeria.

2021 ◽  
Author(s):  
Barkane Aicha ◽  
Sami Mezhoud
Keyword(s):  
Reference Model ◽  
Soil Behavior ◽  
Tunnel Excavation ◽  
Circular Section ◽  
Geological Conditions ◽  
The Stability ◽  
Tunnel Cross Section ◽  
Calculation Code ◽  
Surrounding Soil

Abstract The response of a massif to stresses generated by tunnel excavation depends essentially on the geological conditions, the geometry of the tunnel and its underground position. The major problem related to the construction of these structures is to ensure the stability of the whole tunnel-ground, by controlling the various deformation generated during the constructionIn this context, the present paper examines the effect of these conditions on the behavior of tunnels and the surrounding soil. The study is applied to a real tunnel, in this case the tunnel of Djebel El Ouahch, Algeria was taken as a reference model. The research includes a parametric study to evaluate the effect of several parameters on the behavior of the tunnel and surrounding soil such as the tunnel anchoring depth, the tunnel-soil interface rate, and the shape of the tunnel cross section. The analysis is performed using the PLAXIS 3D TUNNEL calculation code with an elastoplastic Mohr-coulomb model for the soil behavior. The results show that the strongest and most stable position is the mid-deep tunnel with a circular section, with a non-slip interface between the tunnel and the ground. These outcomes can help to understand the effects of various influences parameters which control the stability of the tunnel in a soil with bad characteristics.

scholarly journals The factors affecting the bank’s credit impairment losses by adopting IAS on PSAK 55 in Indonesia

2020 ◽  
Vol 22 (3) ◽  
Author(s):  
Sparta Sparta ◽  
Nadya Trinova
Keyword(s):  
Stock Exchange ◽  
Positive Influence ◽  
Vital Role ◽  
Income Smoothing ◽  
Loan Loss ◽  
Factors Affecting ◽  
Loan Loss Provisions ◽  
Ias 39 ◽  
The Stability

Loan loss provisions in banks plays a vital role in maintaining the stability and health of banks, as well as fulfilling the function of banks in channeling public funds. This study aims to determine the effect of income smoothing and the behavior of procyclicality against reserves of credit losses losses, as well as the role of adoption of IAS 39 in PSAK 55 in moderating the influence of these two variables. The object of this study are conventional commercial banks that are listed on the Indonesia Stock Exchange within the research period of 2008-2017. By using purposive sampling method, I obtained 20 bank samples and 196 observations. The hypotheses in this research are tested using multiple regression analysis. This study shows that income smoothing has a positive influence on loan loss provisions, whereas procyclicality and IAS 39 adoption in PSAK 55 do not affect loan loss provisions significantly. Meanwhile, IAS 39 adoption in PSAK 55 weakens the positive influence of income smoothing, however it cannot moderate the influence of procyclicality on loan loss provisions.  

scholarly journals A Wearable Button Antenna Sensor for Dual-Mode Wireless Information and Power Transfer

Sensors ◽  
2021 ◽  
Vol 21 (17) ◽  
pp. 5678
Author(s):  
Jiahao Zhang ◽  
Jin Meng ◽  
Wei Li ◽  
Sen Yan ◽  
Guy A. E. Vandenbosch
Keyword(s):  
Radiation Pattern ◽  
Local Area ◽  
Power Transfer ◽  
Magnetic Conductor ◽  
Directional Radiation ◽  
Low Profile ◽  
The Stability ◽  
5 Ghz ◽  
Broadside Radiation ◽  
Body Energy

A novel wearable button antenna sensor is proposed for the concept of simultaneous wireless information and power transfer (SWIPT). This integrates two working modes for the transfer of power and information, respectively, and optimizes transfer efficiency. An omni-directional radiation pattern is achieved in the 3.5 GHz World Interoperability for Microwave Access (WiMAX) band to support on-body wireless communications, while a circularly polarized broadside radiation pattern is obtained in the 5 GHz wireless local area networks (WLAN) band to harvest power. The measured −10 dB return loss bandwidths are 4.0% (3.47–3.61 GHz) in the lower band, and 25.0% (4.51–5.80 GHz) in the higher band, respectively. An artificial magnetic conductor (AMC) structure with wideband characteristics is applied to obtain a low-profile design and to increase the stability of the antenna sensor. A high radiation efficiency of over 80% in the whole working band is observed. The specific absorption rate (SAR) of the proposed antenna sensor is below 0.509 W/kg at 3.55 GHz, and below 0.0532 W/kg at 5.5 GHz, respectively, which is much lower than the European standard threshold of 2 W/kg. All these characteristics make the designed antenna sensor suitable for on-body information transmission and off-body energy harvesting. The antenna sensor has been prototyped. Simulations and measurements agree well, proving the validity of the new concept.

An adaptive control allocator for autonomous vehicles with parameter uncertainty

2018 ◽  
Vol 232 (7) ◽  
pp. 807-818
Author(s):  
Dong-liang Chen ◽  
Guo-ping Liu
Keyword(s):  
Adaptive Control ◽  
Theoretical Analysis ◽  
Parameter Uncertainty ◽  
Autonomous Vehicles ◽  
Reference Model ◽  
Digital Simulation ◽  
Control Allocation ◽  
Allocation Scheme ◽  
Negative Effects ◽  
The Stability

In this article, an adaptive control allocation scheme for a class of nonlinear vehicles is proposed. The parameter uncertainty of the effectors is considered in the design of the control allocation algorithm. A reference model is integrated in the framework to overcome the negative effects brought by the parameter uncertainty. The optimum of the solution is discussed for a class of objectives. Stability proof is given. Compared to most existing methods, the conditions to guarantee the stability of the system are relaxed, which is addressed in the theoretical analysis and the experiment. Finally, a digital simulation and an experiment based on a spacecraft simulator are implemented. The results of the simulation and the experiment validate the effectiveness and advantages of the proposed adaptive control allocator.

scholarly journals IMPLEMENTASI COMPOSITE PERFORMANCE INDEX PADA MULTI CRITERIA DECISION MAKING (MCDM) UNTUK MEMILIH LOKASI USAHA UMKM

2019 ◽  
Vol 20 (3) ◽  
pp. 169-178
Author(s):  
Diana Diana
Keyword(s):  
Small And Medium Enterprises ◽  
Positive Influence ◽  
Sensitivity Test ◽  
Test Results ◽  
Local Weight ◽  
Global Weight ◽  
The Stability ◽  
The Right ◽  
Medium Enterprises ◽  
Weight Stability

The selection of the right location for Micro, Small and Medium Enterprises (MSMEs) will have a positive influence on the development of MSMEs and is expected to provide optimal income. The criteria used to select MSME businesses are place rental costs, availability of electricity, availability of clean water, road access, parking area, level of security, proximity to suppliers, similar business and population density of implementation. The Composite Performace Index (CPI) for choosing a location produces location 4 as the best location. In this paper, a single dimension weight sensitivity test is carried out to see the stability of the CPI by conducting trials on 6 variations in the criteria weight. The sensitivity test results that the CPI local weight stability interval is 0.01≤CPI≤0.41, where Location 4 is in the first rank position. The results of the global weight stability interval are at intervals of 0.01 ≤CPI≤ 0.21, where the results of the ranking position of all alternative business locations do not change.

scholarly journals Biological Responses to the Transitional Area of Dental Implants: Material- and Structure-Dependent Responses of Peri-Implant Tissue to Abutments

Materials ◽  
2019 ◽  
Vol 13 (1) ◽  
pp. 72 ◽  
Author(s):  
Jung-Ju Kim ◽  
Jae-Hyun Lee ◽  
Jeong Chan Kim ◽  
Jun-Beom Lee ◽  
In-Sung Luke Yeo
Keyword(s):  
Soft Tissue ◽  
Internal Friction ◽  
Dental Implants ◽  
Relevant Literature ◽  
Positive Influence ◽  
Transitional Area ◽  
Microbial Invasion ◽  
Hard Tissues ◽  
The Stability ◽  
External Connections

The stability of peri-implant tissue is essential for the long-term success of dental implants. Although various types of implant connections are used, little is known about the effects of the physical mechanisms of dental implants on the stability of peri-implant tissue. This review summarizes the relevant literature to establish guidelines regarding the effects of connection type between abutments and implants in soft and hard tissues. Soft tissue seals can affect soft tissue around implants. In external connections, micromobility between the abutment and the hex component of the implant, resulting from machining tolerance, can destroy the soft tissue seal, potentially leading to microbial invasion. Internal friction connection implants induce strain on the surrounding bone via implant wall expansion that translates into masticatory force. This strain is advantageous because it increases the amount and quality of peri-implant bone. The comparison of internal and external connections, the two most commonly used connection types, reveals that internal friction has a positive influence on both soft and hard tissues.

Yagi-Uda Antenna for Navigational Aids Using HFSS

2017 ◽  
Vol 8 (3) ◽  
pp. 627
Author(s):  
Ramesh P. ◽  
V. Mathivanan
Keyword(s):  
Radiation Pattern ◽  
Frequency Band ◽  
High Frequency ◽  
Return Loss ◽  
Impedance Matching ◽  
Radiation Patterns ◽  
Ultra High Frequency ◽  
Navigational Aids ◽  
The Stability ◽  
Uhf Band

<p>In this paper, the ultra high frequency of yagi-uda antenna for navigational has been designed to improve the usable bandwidth by improving the stability of the radiation patterns. The frequency band of ultra high frequency is 300-3000 MHZ. The main aim of this paper is to reduce the loss, improve the gain and also to enhance the efficiency of ultra high frequency yagi-uda antenna for utilizing the navigational aids. The proposed UHF band of Yagi-Uda antenna has been designed by using ANSYS HFSS tool for the application of navigational aids. The characteristics specifications of yagi-uda antenna such as Radiation pattern, S11 (return loss), impedance matching and gain are analyzed in this work.</p>

scholarly journals On Fractional Model Reference Adaptive Control

2014 ◽  
Vol 2014 ◽  
pp. 1-8 ◽  
Author(s):  
Bao Shi ◽  
Jian Yuan ◽  
Chao Dong
Keyword(s):  
Adaptive Control ◽  
Reference Model ◽  
Model Reference Adaptive Control ◽  
Lyapunov Theory ◽  
Model Reference ◽  
Fractional Integrator ◽  
The Stability ◽  
Adaptation Law ◽  
Integrator Model ◽  
Model Reference Adaptive

This paper extends the conventional Model Reference Adaptive Control systems to fractional ones based on the theory of fractional calculus. A control law and an incommensurate fractional adaptation law are designed for the fractional plant and the fractional reference model. The stability and tracking convergence are analyzed using the frequency distributed fractional integrator model and Lyapunov theory. Moreover, numerical simulations of both linear and nonlinear systems are performed to exhibit the viability and effectiveness of the proposed methodology.

Crystal Chemistry and Electrochemical Behavior of New Manganese Substituted Nickel Hydroxides

1994 ◽  
Vol 369 ◽  
Author(s):  
L. Guerlou-Demourgues ◽  
C. Delmas
Keyword(s):  
Crystal Chemistry ◽  
Electrochemical Behavior ◽  
Positive Influence ◽  
The Stability ◽  
Tetravalent State ◽  
Spontaneous Oxidation

AbstractAgeing of the manganese substituted nickel hydroxides in 5M-KOH electrolytic medium leadsto a structure interstratification which is related to spontaneous oxidation of trivalentmanganese ions to the tetravalent state, As far as the electrochemical behavior is concerned, the trend to interstratification has a positive influence on the stability of the capacity upon cycling. In addition, the chargeability is improved by the presence of manganese.

Sensorless Parameter Identification Method for PMSM Based on Double Manifold Sliding Mode

2010 ◽  
Vol 171-172 ◽  
pp. 632-635
Author(s):  
Ze Cheng ◽  
Fa Bin Yan ◽  
Yan Li Liu ◽  
Ya Fei Ji
Keyword(s):  
Parameter Identification ◽  
Reference Model ◽  
Sliding Mode ◽  
Current Model ◽  
Dynamic Performance ◽  
Adaptive Model ◽  
Output Current ◽  
Identification Method ◽  
Real Model ◽  
The Stability

An adaptive model reference parameter identification method without sensors for PMSM is presented in this paper and this method is based on double manifold sliding mode. The real model of PMSM is selected as the reference model and the d/q frame observer which is constructed using current model of the motor is selected as the adjustable model. The manifold sliding mode surface is constructed using the output (current in d/q frame) errors of the two models. Proper parameters are selected to guarantee the stability of the observer. The adjustable model converges to the reference model and the running state of motor can be identified. Theoretical analysis and simulation results show that the proposed strategy has high static and dynamic performance，high tracking precision as well as stronger robustness.

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