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Wyświetlanie 1-3 z 3
Tytuł:
Dynamic effects and large – amplitude motion in Jacobi and Poincaré shape transitions in atomic nuclei
Autorzy:
Mazurek, Katarzyna
Dudek, Jerzy
Maj, Adam
Kmiecik, Maria
Rouvel, David
Powiązania:
https://bibliotekanauki.pl/articles/763389.pdf
Data publikacji:
2015
Wydawca:
Uniwersytet Marii Curie-Skłodowskiej. Wydawnictwo Uniwersytetu Marii Curie-Skłodowskiej
Tematy:
shape transition
collective Hamiltonian
zero-point vibration
rotating nucleus
Opis:
The Jacobi and Poincaré shape transitions are very promising way to investigate the shape of the nucleus. The presented here quasi-phenomenological approach allows to estimate the experimental conditions which are necessary to observe these phenomena. The static energy minimum gives the spin ranges and the fissility of atomic nuclei soft for the shape transitions and available experimentally. Dynamical effects taken into account through the solving collective Hamiltonian for zero-point vibration estimation, changes the spin rages for the shape transitions. The static deformation of the nucleus constrained by the minimum of energy for given spin has been enhanced to dynamical nuclear shapes permitted by the zero point energy. The large amplitude vibrations around the static deformation gives the ensemble of nuclear shapes possible to be observed.
Źródło:
Annales Universitatis Mariae Curie-Skłodowska, sectio AAA – Physica; 2015, 70
0137-6861
Pojawia się w:
Annales Universitatis Mariae Curie-Skłodowska, sectio AAA – Physica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Fringing field modelling in MEMS capacitive comb-drive accelerometers
Autorzy:
Maj, Cezary
Nazdrowicz, Jacek
Stawiński, Adam
Powiązania:
https://bibliotekanauki.pl/chapters/32083885.pdf
Data publikacji:
2021
Wydawca:
Politechnika Białostocka. Oficyna Wydawnicza Politechniki Białostockiej
Tematy:
Accelerometers
MEMS devices
fringing field
Opis:
Modelling is a crucial step in designing MEMS devices. It is needed to estimate the device performance without its fabrication. Initially, simple calculations are needed to verify the possibility of device production with a given performance and to know the basic parameters necessary to achieve the desired goals. Further, optimization is commonly performed in order to improve the design. Both steps require simulation methods that are very fast and precise enough to reduce time to market. In many cases, classical, precise FEM simulations are not necessary and simple analytical models are used. MEMS devices like accelerometers, commonly uses elements of simple shapes that can be easily described with simple analytical formulas. However, analytical modelling is getting more complicated in case of capacitive transduction. Typically, these devices operate in the range of linear response but nothing can be done to avoid the influence of non-uniform electric field. Due to fringing field, a capacitance is often underestimated when using classical parallel plate formula. Therefore, there is a need for proper fringing field modelling. In this chapter, analytical modelling of fringing field on an example of MEMS accelerometer is presented. Specific structure type known as comb-drive consists of many small capacitors that enhance the impact of fringing field. Accelerometers in all axes are analyzed. Moreover, Z-axis accelerometer induces different electric field distribution due to the use of thinned fingers. Thus, analytical formulas are derived for various conditions. Finally, the model is compared with Coventor MEMS+ and fabricated strictures are measured in order to validate analytical approach.
Źródło:
Methods and tools in CAD – selected issues; 15-27
9788366391871
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Modal analysis of vibratory microgyroscopes
Autorzy:
Nazdrowicz, Jacek
Maj, Cezary
Jankowski, Mariusz
Szermer, Michał
Stawiński, Adam
Napieralski, Andrzej
Powiązania:
https://bibliotekanauki.pl/chapters/32083882.pdf
Data publikacji:
2021
Wydawca:
Politechnika Białostocka. Oficyna Wydawnicza Politechniki Białostockiej
Tematy:
resonator
accelerometer
MEMS gyroscopes
Opis:
The aim of this paper is to bring up modal analysis of MEMS gyroscope operation with COMSOL and Matlab/SIMULINK software. Two different geometries are assumed and simulation results are presented. The other objective of the paper is to present modal analysis results by taking into consideration spring constants and variation in the damping coefficients as an effect of temperature variation.
Źródło:
Methods and tools in CAD – selected issues; 29-38
9788366391871
Dostawca treści:
Biblioteka Nauki
Artykuł
    Wyświetlanie 1-3 z 3

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