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Journal articles on the topic 'Qucosa'

Author: Grafiati

Published: 4 June 2021

Last updated: 5 February 2022

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1

Trainor, P. "DEVELOPMENT: The Bills of Qucks and Duails." Science 299, no. 5606 (January 24, 2003): 523–24. http://dx.doi.org/10.1126/science.1081521.

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2

Liao, Yuan. "QuCOM: A QoS Management Model for Component System." Journal of Computer Research and Development 42, no. 10 (2005): 1802. http://dx.doi.org/10.1360/crad20051025.

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3

Pleau, M., G. Pelletier, H. Colas, P. Lavallée, and R. Bonin. "Global predictive real-time control of Quebec Urban Community's westerly sewer network." Water Science and Technology 43, no. 7 (April 1, 2001): 123–30. http://dx.doi.org/10.2166/wst.2001.0404.

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Quebec Urban Community (QUC) has selected Global Predictive Real-Time Control (GP-RTC) as the most efficient approach to achieve environmental objectives defined by the Ministry of Environment. QUC wants to reduce combined sewer overflows (CSOs) frequency to the St Lawrence river to two events per summer period in order to reclaim the use of Jacques-Cartier Beach for recreational activities and sports of primary contact. QUC's control scheme is based on the Certainty Equivalent Control Open Loop Feedback (CEOLF) strategy which permits one to introduce, at each control period, updated measurements and meteorological predictions. A non-linear programming package is used to find the flow set points that minimise a multi-objective (cost) function, subjected to linear equality and inequality constraints representing the physical and operational constraints on the sewer network. Implementation of GP-RTC on QUC's westerly network was performed in the summer of 1999 and was operational by mid-August. Reductions in overflow volumes with GP-RTC compared to static control are attributed to the optimal use of two existing tunnels as retention facilities as well as the maximal use of the wastewater treatment plant (WWTP) capacity.

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4

Soomro, D. M., S. C. Chong, Z. A. Memon, and F. Abbasi. "Power Quality Improvement in QUCEST Larkana Campus by Using Three Types of Power Filters." International Journal of Power Electronics and Drive Systems (IJPEDS) 8, no. 4 (December 1, 2017): 1876. http://dx.doi.org/10.11591/ijpeds.v8.i4.pp1876-1885.

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The increase of power electronic converters at the end-user side is unavoidable and it will cause current harmonic distortion and wide range of disturbance in the power system (PS). This paper presents current harmonic compensation for the test case of the Quaid-e-Awam University College of Engineering Sciences and Technology (QUCEST) Larkana campus in MATLAB SIMULINK by using three types of power filters i.e. passive, active and hybrid power filters. The purpose of this experiment and simulation model is to analyse and find out the best solution for reducing the current harmonic and unbalanced load condition at the incoming transformer to the campus. Moreover, this paper presents the testing and comparison of the active and hybrid power filters by using the combined design technique of harmonic compensate control system based on Unit Vector Template (UVT) and Instantaneous Reactive Power (IRP) theory. The simulation results allow to identify the effectiveness of the control system along with passive filter. Based on the testing and simulation results of three types of power filters, hybrid power filter has the maximum ability to mitigate the current harmonic in the system, and it also reduces the neutral current thus causing less stress in the existing system.

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5

von Winckel, G., and A. Borzi`. "QUCON: A fast Krylov–Newton code for dipole quantum control problems." Computer Physics Communications 181, no. 12 (December 2010): 2158–63. http://dx.doi.org/10.1016/j.cpc.2010.08.023.

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6

Zonca, A., B. Roucaries, B. Williams, I. Rubin, O. D'Arcangelo, P. Meinhold, P. Lubin, et al. "Modeling the frequency response of microwave radiometers with QUCS." Journal of Instrumentation 5, no. 12 (December 20, 2010): T12001. http://dx.doi.org/10.1088/1748-0221/5/12/t12001.

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7

Jahn, S., and M. E. Brinson. "Interactive compact device modelling using Qucs equation-defined devices." International Journal of Numerical Modelling: Electronic Networks, Devices and Fields 21, no. 5 (September 2008): 335–49. http://dx.doi.org/10.1002/jnm.676.

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8

Mita, Makoto, and Hiroshi Toshiyoshi. "An equivalent-circuit model for MEMS electrostatic actuator using open-source software Qucs." IEICE Electronics Express 6, no. 5 (2009): 256–63. http://dx.doi.org/10.1587/elex.6.256.

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9

Buhari, Abudhahir, Zuriati Ahmad Zukarnain, Roszelinda Khalid, and Wira Jaafar Ahmad Zakir Dato'. "A Generic Simulation Framework for Non-Entangled based Experimental Quantum Cryptography and Communication: Quantum Cryptography and Communication Simulator (QuCCs)." IOP Conference Series: Materials Science and Engineering 160 (November 2016): 012095. http://dx.doi.org/10.1088/1757-899x/160/1/012095.

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10

Brinson, M. E., and S. Jahn. "Modelling of high-frequency inductance with Qucs non-linear radio frequency equation defined devices." International Journal of Electronics 96, no. 3 (March 2009): 307–21. http://dx.doi.org/10.1080/00207210802640603.

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11

Brinson, M. E., and V. Kuznetsov. "A new approach to compact semiconductor device modelling with Qucs Verilog-A analogue module synthesis." International Journal of Numerical Modelling: Electronic Networks, Devices and Fields 29, no. 6 (April 15, 2016): 1070–88. http://dx.doi.org/10.1002/jnm.2166.

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12

Chen, Yang-Che, Chao Min Chang, Rongshun Chen, Max Ti-Kuang Hou, Hiroshi Toshiyoshi, and Hiroyuki Fujita. "On the symmetry of electric fields exerting on interdigitated structures: Qucs equivalent circuit model and experiment." Journal of Micromechanics and Microengineering 21, no. 4 (March 22, 2011): 045026. http://dx.doi.org/10.1088/0960-1317/21/4/045026.

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13

Brinson, M. E., and H. Nabijou. "Adaptive subcircuits and compact Verilog-A macromodels as integrated design and analysis blocks in Qucs circuit simulation." International Journal of Electronics 98, no. 5 (May 2011): 631–45. http://dx.doi.org/10.1080/00207217.2011.562452.

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14

Domański, Krzysztof, Piotr Prokaryn, Daniel Tomaszewski, Michał Marchewka, and Piotr Grabiec. "Development and Modeling of Thermal Energy Harvesting Setup." Journal of Nano Research 39 (February 2016): 191–201. http://dx.doi.org/10.4028/www.scientific.net/jnanor.39.191.

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A setup for a thermal energy harvesting based on a conversion of a thermal energy into a mechanical energy followed by a conversion of the mechanical energy into an electric field energy has been developed. The key elements of such a setup are a bimetal spring and electrodes covered by electret layers with a permanent charge. The electrodes are kept at different temperatures. The bimetal spring exchanges the thermal energy with the "hot" and "cold" electrodes. The heating and cooling stimulates the spring vibratios. During the vibrations the spring acts as a common plate of two variable capacitors. The electrodes with the electret layers are the fixed plates of these capacitors. The charge induced continuously at the plates of the capacitors is transferred via a rectifying circuit to the external capacitor.Several aspects of the setup development have been considered, including different electret materials, different methods of the electret charging, and different load capacitors.A compact model of the charging effect has been also developed. It has been implemented in Qucs program, where it is represented as a so-called equation defined device component.

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15

Brinson, M. E., and S. Jahn. "Qucs: A GPL software package for circuit simulation, compact device modelling and circuit macromodelling from DC to RF and beyond." International Journal of Numerical Modelling: Electronic Networks, Devices and Fields 22, no. 4 (July 2009): 297–319. http://dx.doi.org/10.1002/jnm.702.

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16

Savchuk, Arsen. "Development of a model of electric impedance in the contact between the skin and a capacitive active electrode when measuring electrocardiogram in combustiology." Eastern-European Journal of Enterprise Technologies 2, no. 5 (110) (April 30, 2021): 32–38. http://dx.doi.org/10.15587/1729-4061.2021.228735.

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Long-term ECG (electrocardiogram) measurement in patients with burns is a complicated problem since the overlapping of surface contact electrodes can lead to additional injuries. The possibility of ECG recording in patients with burns using capacitive electrodes was not proved, and there are no models of the electrode contact with a patient’s body while rehabilitation means are used. In this paper, the model of the contact between capacitive electrodes and the skin was modified and the circuit model of the contact: skin – bandages (saline solution) – film – active capacitive electrode, was described. The influence of the parameters of a capacitive electrode on the amplitude-frequency characteristics (AFC) of the contact of an electrode with skin was assessed. It was found that contact capacitance is crucial to obtain a high-quality ECG signal. The parameters of the impedance of bandages, saline solution, a dielectric film were calculated, and their effect on the AFC was studied. Based on the modified model, the AFC contact was modeled taking into consideration all the calculated parameters; it was found that the resulting AFC of the contact corresponds to the frequency range of the ECG signal. Analysis of the calculations proves the possibility of using capacitive electrodes when applying various rehabilitation means. It was found that at a change in the impedance of the saline solution from 0.1 gigaohms to 1 gigaohm, the changes in the AFC of the contact are not crucial for the final quality of the received signal. All calculations were carried out by modeling in the Qucs environment (ngspice SPICE). Simulation results can be used in the development of new types of capacitive electrocardiographic electrodes. The proposed model can be used to study other wound covers, as well as to model physiological processes when putting artificial skin and wound covers

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17

Baser, Mustafa. "Promoting conceptual change through active learning using open source software for physics simulations." Australasian Journal of Educational Technology 22, no. 3 (September 28, 2006). http://dx.doi.org/10.14742/ajet.1290.

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<span>This paper reports upon an active learning approach that promotes conceptual change when studying direct current electricity circuits, using free open source software, </span><em>Qucs.</em><span> The study involved a total of 102 prospective mathematics teacher students. Prior to instruction, students' understanding of direct current electricity was determined by a subset of a previously developed multiple choice conceptual test. All students received an active learning instruction using </span><em>Qucs</em><span>simulations. After instruction, the same test was administered to the students to determine the effectiveness of the instruction they received. Paired t-test analyses showed that students' progress on understanding of direct current electricity was significant. A six week delayed post-test revealed that this observed improvement promised to be durable, at least in the short term. Students' evaluation of using </span><em>Qucs</em><span> is also reported.</span>

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18

Brinson, M. E., and V. Kuznetsov. "Extended behavioural device modelling and circuit simulation with Qucs-S." International Journal of Electronics, July 19, 2017. http://dx.doi.org/10.1080/00207217.2017.1357764.

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19

"Simulation of the Electrical Parameters of Organic Photovoltaic Cells under QUCS and GPVDM Software." WSEAS TRANSACTIONS ON CIRCUITS AND SYSTEMS 19 (September 10, 2020). http://dx.doi.org/10.37394/23201.2020.19.22.

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Polymer solar cells have attracted much attention during the last years due to their lowerfabrication cost and possibility of using flexible substrates. Various parameters contribute to the stability of theperformances of organic solar cells: the configuration or the structure of the cells, the materials used in theirelaboration such as the active layer, the hole transport layer, the electron transport layer and the electrodecontact. This work represents the modelling and simulation of organic solar cells using two software: QuiteUniversal Circuit Simulator, QUCS and General-Purpose Photovoltaic Device Model, GPVDM. First, anequivalent circuit model constituted from one diode, a series and shunt resistance, and a photocurrent generatorhave been used, this circuit is simulated under QUCS. The simulated results as function of different parameterssuch as series resistance, temperature of the cell, the ideality factor and current saturation are given. Thecurrent density as function of voltage J-V characteristics of the organic cell obtained from the experimentalresults are compared to the simulated one, results show that the curve with Rs=10Ω correspond to theexperimental one, the ideality factor obtained by simulation of the organic cell is 1.2, which corresponds torecombination assisted by the traps levels. Second, we discuss the different structures of organic solar cells andthe role of the interface layer used as hole transport layer or electron transport layer. The effect of the thicknessand the type of the interfacial layers is simulated under GPVDM. The best efficiency is obtained in the case ofcell using aluminum-doped zinc oxide (AZO) as electron transport layer and copper oxide (Cu2O) as holetransport layer. The optimized cell is of the type: ITO/AZO (40 nm)/P3HT:PCBM (200 nm)/Cu2O (20 nm)/Ag,with a best power conversion efficiency of 5%.

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20

Zubarev, A. V., and A. N. SHatunov. "Modeling of electrical circuits within the framework of theoretical discipline fundamentals of electrical engineering in the free software product Qucs." SCIENTIFIC DEVELOPMENT TRENDS AND EDUCATION, 2019. http://dx.doi.org/10.18411/lj-10-2019-09.

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21

Ramírez-Carvajal, Luis Eduardo, Karla Cecilia Puerto-López, and Luilly Alejandro García-Ortiz. "Metodología para el análisis y diseño de circuitos con transistores y diodos en asignaturas de electrónica utilizando una herramienta computacional." Eco Matemático 12, no. 2 (July 1, 2021). http://dx.doi.org/10.22463/17948231.3075.

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Las herramientas tecnológicas mejoran el rendimiento académico haciendo más dinámicos y eficientes los procesos de enseñanza y aprendizaje. Se presenta una metodología de análisis y diseño de circuitos mediante el uso de una herramienta tecnológica en asignaturas de electrónica de la Universidad Francisco de Paula Santander. Se desarrolló una metodología ágil que consistió en cuatro elementos: planeación, diseño, codificación y prueba. En la planeación se consultaron las fuentes adecuadas y se desarrolló una metodología de análisis y diseño de circuitos con diodos y transistores. En el diseño se utilizó diagramación UML para el modelado del software. En codificación se utilizó lenguaje de programación java y se realizó una interfaz dinámica con la herramienta NetBeans. Finalmente se elaboraron pruebas a la interfaz, que consistieron en llevar a cabo diseños y análisis de circuitos con diodos y transistores, que fueron luego modelados en el software de simulación QUCS para calcular los errores en las variables y avalar la herramienta desarrollada. Los errores en todas las pruebas fueron inferiores al 2%, lo que implica que la interfaz es eficiente, interactiva e incentiva los procesos de enseñanza y aprendizaje haciéndolos más dinámicos.

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22

Kula, Sebastian. "Parametrization of CPW for Photonics Application with the Use of Closed Form Formulas." Periodica Polytechnica Electrical Engineering and Computer Science, March 26, 2020. http://dx.doi.org/10.3311/ppee.14894.

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In this paper parametrized analysis of CPW (Coplanar Waveguide) applied in photonics is presented. The analysis is based on analytical formulas, which were delivered and modified from conformal mapping technique, and also after review of available literature from analytical models for the conventional CPW. Adjustment of the already reported CPW formulas was performed to properly model thin films CPW structures in PIC (Photonic Integrated Circuit). Thus, a closed expressions were proposed to simulate basic parameters, like: per unit length (p.u.l.) R (resistance), L (inductance), C (capacitance), G (conductance) and propagation quantity like characteristic impedance Zo versus frequency. The CPW line dedicated for the PIC application, is based on InP (Indium Phosphide) substrate and with air or BCB (Benzocyclobutene) surroundings of the metallization on the top. The modified formulas are curve-fitting approximations, with new fitting coefficients. Essential modifications are for p.u.l. C and p.u.l. L. Usefulness and effectiveness of the modified method was verified through results comparison with simulations in full-wave Electronic Design Automation software, with the circuit simulator QUCS and with real measurements, conducted with the use of PNA (Performance Network Analyzer). The paper novelty are new coefficients for analytical formulas, implementation of modified formulas in the octave code and model parametrization for geometrical parameters.

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