Articole ştiinţifice: Recent submissions

Now showing items 2101-2120 of 4684

Single-Chip 135-160 GHz Doubler with more than 150 mW Output Power based on Discrete Schottky Diodes

MORO-MELGAR, D.; COJOCARI, O.; OPREA, I.; RICKES, M.; HOEFLE, H. (IEEE, 2018)

Single chip doubler based on novel diamond-based discrete Schottky diodes is presented here. CVD Diamond technology has been integrated by ACST GmbH in the discrete diode structure to implement in high power multipliers ...
Resonant tunneling transport in ZnxBe1-xSe/ZnSe/ZnyBe1-ySe asymmetric quantum structures

SIRKELI, Vadim P.; YILMAZOGLU, Oktay; AL-DAFFAIE, Shihab; OPREA, Ion; ONG, Duu Sheng; KÜPPERS, Franko; HARTNAGEL, Hans L. (International Society for Optics and Photonics, 2017)

II-VI compounds are promising materials for the fabrication of room-temperature terahertz devices due to their beneficial properties like as type-I conduction band alignment, high breakdown field strength (~331 kV/cm for ...
Qualification of Direct Detection Technology for ESA MetOp-SG Space Mission

HOEFLE, Matthias; RICKES, Martin; OPREA, Ion; COJOCARI, Oleg (International Symposium on Space Terahertz Technology, ISSTT, 2017)

This contribution presents the ACST 89 GHz Schottky detector module performance and pre-qualification results towards the second European meteorological operational satellite program MetOp-SG. The detector flight module ...
Internal quantum efficiency enhancement of InGaN/GaN LEDs with Mg-Si pin-doped GaN quantum barrier

KÜPPERS, F.; SIRKELI, V. P.; YILMAZOGLU, O.; AL-DAFFAIE, S.; OPREA, I.; ONG, D. S.; HARTNAGEL, H. L. (Institutul de Fizică Aplicată al AŞM, 2018)

In this work we study numerically the effect of Mg-Si pindoping of GaN quantum barrier within InGaN/GaN multi quantum wells (MQWs) on the internal quantum efficiency (IQE) of LEDs in comparison with LED devices with undoped, ...
High Power Discrete Schottky Diodes Based 275-305 GHz Transceiver for FMCW-Rada

MORO-MELGAR, D.; COJOCARI, O.; OPREA, I.; HOEFLE, H.; RICKES, M. (IEEE, 2018)

A heterodyne 275-305 GHz transceiver intended for frequency modulated continuous wave radar applications is presented here. A commercial E-band active multiplication chain is used to provide the required power and frequency ...
Efficiency enhancement of InGaN/GaN light-emitting diodes with pin-doped GaN quantum barrier

SIRKELI, Vadim P.; YILMAZOGLU, Oktay; AL-DAFFAIE, Shihab; OPREA, Ion; ONG, Duu Sheng; KÜPPERS, Franko; HARTNAGEL, Hans L. (IOP Publishing, 2016)

Blue InGaN/GaN light-emitting diodes with undoped, heavily Si-doped, Si delta-doped, heavily Mg-doped, Mg delta-doped, and Mg–Si pin-doped GaN barrier are investigated numerically. The simulation results demonstrate that ...
Effect of Si-doping of the GaN barrier on the internal quantum efficiency of InGaN/GaN light-emitting diodes

SIRKELI, Vadim; YILMAZOGLU, Oktay; AL-DAFFAIE, S.; OPREA, I.; ONG, Duu Sheng; KUPPERS, Franko; HARTNAGEL, Hans Ludwig (Institutul de Fizică Aplicată al AŞM, 2016)

In the past decade the AlInGaN-based light-emitting diodes (LEDs) have attracted attentions of most researchers as promising candidates to replace conventional lamps in lighting applications including general illuminations, ...
A 600GHz High Power Tripler for Space Applications

GIBSON, Hugh J.; COJOCARI, Oleg; OPREA, Ion; THOMAS, Bertrand; NARHI, Tapani (Oxford, 2015)

Several recent space missions have required un-cooled receivers for radiometer use above 500GHz for atmosphere probing. These include MetOP 2nd generation meteorological satellites and Jupiter Moons JUICE spacecraft. The ...
183 GHz Mixer on InGaAs Schottky Diodes

OPREA, I.; WALBER, A.; COJOCARI, O.; GIBSON, H.; ZIMMERMANN, R.; HARTNAGEL, H. L. (Oxford, 2010)

This work reports on experimental results of a 183 GHz sub-harmonically pumped mixer based on InGaAs antiparallel diode pair. The diode structure provides extremely low parasitic capacitance of about 2.5 fF. Roughly estimated ...
Impact of treatment with oxidative bleaching agents on walnut (Juglans Regia L.) shell chromatic parameters

GROSU, Carolina; SIMINIUC, Rodica; TURCANU, Dinu; COVALIOV, Eugenia; GUTIUM, Olga (Scientific Research Publishing Inc., 2021)

Walnut meal is a nutrient-rich product and has a high nutritional value. Walnut meal is a product that can be used in food technology, in order to improve the nutritional quality, expand the range of confectionery products, ...
Impact of treatment with oxidative bleaching agents on walnut (Juglans Regia L.) shell chromatic parameters

BOAGHI, Eugenia (National University of Food Technologies, Ukraine, 2016)

Walnuts were formerly marketed in an unbleached condition, but the demand of the trade has led to the general practice of bleaching. Some walnuts are still sold in an unbleached condition, but most of those destined for ...
Tuning of the PID Controller to the System with Maximum Stability Degree using Genetic Algorithm

COJUHARI, Irina; FIODOROV, Ion; IZVOREANU, Bartolomeu; MORARU, Dumitru (IEEE, 2020)

In this paper is proposed a tuning algorithm of PID controller that offers the maximum stability degree of the control system, based on the genetic algorithm. The tuning algorithm was designed based on the maximum stability ...
The Method for Synthesis the PI and PID Algorithms to the Model of Object with Inertia Second Order

IZVOREANU, Bartolomeu; COJUHARI, Irina; FIODOROV, Ion; MORARU, Dumitru; POTLOG, Mihail (IEEE, 2019)

In this paper was developed an efficient procedure for tuning the PI and PID algorithms to the model of object with inertia second order with known parameters, that has two poles allocated in the left half of the complex ...
Synthesis of the Typical Controllers to the Model of Objects with Advance-Delay and Time Delay for the Control System with Maximum Stability Degree

FIODOROV, Ion; COJUHARI, Irina; IZVOREANU, Bartolomeu; MORARU, Dumitru (IEEE, 2018)

In this paper it is proposed to extend the maximum stability degree criterion method for synthesis of the typical controllers to the model of objects with advance-delay and time delay. There are elaborated the analytical ...
Synthesis of the State-Feedback Controllers by the Genetic Algorithm According to the Maximum Stability Degree Criterion

COJUHARI, Irina; FIODOROV, Ion; IZVOREANU, Bartolomeu; MORARU, Dumitru (IEEE, 2021)

The synthesis algorithm of state-feedback controllers is proposed in this paper. It was improved the procedure of finding the tuning parameters by the maximum stability degree criterion, using the genetic algorithm. Based ...
Utilizarea extractului de păducel pentru fabricarea cremei de brânză funcţionale

GHENDOV-MOŞANU, Aliona; POPESCU, Liliana; LUNG, Ildico; OPRIŞ, Ocsana-Ileana; SORAN, Maria-Loredana; STURZA, Rodica (Academia de Ştiinţe a Moldovei, 2018)

Cream cheese samples with 1.1 % hydroalcoholic extract and 2.2 % liposoluble extract of hawthorn fruits were obtained. The content of biologically active substances in hydroalcoholic and liposoluble extracts preserves the ...
Dietary improvement of the iron statute of the rats with experimental anemia

STURZA, Rodica; GUDUMAC, Valentin; DESEATNICOVA, Olga; GHENDOV-MOSANU, Aliona (Moldovan Association for Biosafety and Biosecurity, 2021)

Introduction. One of the major problems characterizing the nutritional status is the iron deficiency, which leads to decreased immunity, increased incidence of infectious diseases and anemia. Obviously, only well-thought-out ...
Controlling the Risk of Bacillus in Food Using Berries

SANDULACHI, Elisaveta; BULGARU, Viorica; GHENDOV-MOSANU, Aliona; STURZA, Rodica (Scientific Research Publishing Inc., 2021)

The aim of this study was to develop initial symbiotic combinations between lactic acid bacteria and berries to control food quality. The relevant ability of lactic acid bacteria in the presence of berry additives to ...
The tuning of the PID and PIDD2 algorithms to the model objects with inertia and identical elements and time delay

IZVOREANU, Bartolomeu; COJUHARI, Irina (Universitatea Tehnică „Gheorghe Asachi” din Iaşi, 2013)
The Synthesis of Linear Regulators for Aperiodic Objects with Time Delay According to the Maximal Stability Degree Method

IZVOREANU, Bartolomeu; FIODOROV, Ion (Elsevier, 1997)

The synthesis algorithms of linear regulators for a large class of aperiodic objects’models with time delay is proposed in this paper according to the maximal stability degree method of the monovariable designed systems. ...

Now showing items 2101-2120 of 4684

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