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1
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Calculations of Energy Levels Using the Weakest Bound Electron Potential Model Theory

100%
Zhang T., Zheng N.
Acta Physica Polonica A
|
2009
|
vol. 115
|
issue 3
629-635
EN
In this paper, we introduce a new method for calculation of energy levels in detail and give our results for several iso-spectrum-level series as examples: [He] 2s2p ^{1}P_{1}, [He] 2s2p ^{3}P_{0}, [He] 2s2p ^{3}P_{2}, and [He] 2s3s ^{3}S_{1} series of Be-like sequence; [Ne] 3s^{2}3d ^{2}D_{3/2} series and [Ne] 3s^{2}3d ^{2}D_{5/2} series of Al-like sequences; [Ne] 4p ^{2}P_{1/2} series, [Ne] 5d ^{2}D_{5/2} series, and [Ne] 6f ^{2}F_{7/2} series of Na-like sequences. In the method I(Z)=T_lim (Z)-T(Z,n), where I(Z), T_lim(Z), and T(Z,n) denote ionization potential, series limit, and energy level of a given member, respectively. The expression of non-relativistic part of I(Z) is derived from weakest bound election potential model theory and relativistic effects of I(Z) are included by using a six-order polynomial in Z. Our results are compared with the experimental data and with those obtained by other theoretical method.
2
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Theoretical Study of Energy Levels and Transition Probabilities of Boron Atom

100%
Tian-yi Z., Neng-wu Z.
Acta Physica Polonica A
|
2009
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vol. 116
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issue 2
141-153
EN
Though the electrons configuration for boron atom is simple and boron atom has long been of interest for many researchers, the theoretical studies for properties of BI are not systematic, there are only few results reported on energy levels of high excited states of boron, and transition measurements are generally restricted to transitions involving ground states and low excited states without considering fine structure effects, provided only multiplet results, values for transitions between high excited states are seldom performed. In this article, by using the scheme of the weakest bound electron potential model theory calculations for energy levels of five series are performed and with the same method we give the transition probabilities between excited states with considering fine structure effects. The comprehensive set of calculations attempted in this paper could be of some value to workers in the field because of the lack of published calculations for the BI systems. The perturbations coming from foreign perturbers are taken into account in studying the energy levels. Good agreement between our results and the accepted values taken from NIST has been obtained. We also reported some values of energy levels and transition probabilities not existing on the NIST data bases.
3
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An Experimental Study on Unipolar Induction

80%
Chen K., Li X., Hui Y.
Acta Physica Polonica A
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2017
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vol. 131
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issue 2
271-274
EN
Unipolar induction phenomenon is a special kind of electromagnetic induction. There are two quite opposite theoretical explanations for this phenomenon, i.e., the N theory and the M theory. The research of unipolar induction has made significant progress, but there is no final conclusion by now. In this paper, an experiment of inversely rotating double Faraday disks and double magnets are designed, and the unipolar induction phenomenon is verified by means of theoretical calculation and experiment. Comparing and analyzing the theoretical calculation and experiment results, our experimental results support the N theory, that is to say, our experiment shows that the magnetic field does not rotate when the magnet rotates.
4
Content available remote

Ruby Laser Interaction with Austenite Structural Materials

80%
Milosavljević A., Petronić S., Srećković M., Ristić S., Nešić I., Pljakić R., Negovanović V.
Acta Physica Polonica A
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2009
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vol. 115
|
issue 4
823-825
EN
The investigations were carried out on chrome nickel steel and nickel based superalloy samples thermo-mechanically treated to obtain optimal mechanical properties and surface stability. Chrome nickel steel and a few nickel based superalloys samples were exposed to the laser beam before creep deformation process. The second group of nickel based superalloy samples were exposed after the creep deformation. The damages occurred by exposing of chrome nickel steel and nickel base superalloy samples to the ruby laser were analyzed by scanning electron microscope and energy-dispersive X-ray spectrometry. In this paper, the influence of laser dynamical regime (MW/mm^{2}) to the microstructural changes of heat treated chrome nickel steel and nickel based superalloy are analyzed and discussed.
5
Content available remote

Fine-Scale Structure Investigation of Nimonic 263 Superalloy Surface Damaged by Femtosecond Laser Beam

80%
Milosavljevic A., Petronic S., Sreckovic M., Kovacevic A., Krmpot A., Kovacevic K.
Acta Physica Polonica A
|
2009
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vol. 116
|
issue 4
553-556
EN
Due to the specific conditions of manufacturing, processing and utilization of nickel-base superalloys, the implementation of contemporary precision techniques is necessary in the research of the alloys features. Multi-component nickel-base superalloys, with about of 50% of nickel content, are commonly exploited in the conditions of high temperatures and pressures as well as in various aggressive operating environments. For successful quality control, which includes the monitoring of the changes in the alloy microstructure, fine-scale structure investigations are necessary. In this work, the samples of nickel-base superalloys have been exposed to 800 nm femtosecond laser in various operating regimes. Surface damages and dents caused by femtosecond laser pulses have been observed by optical and scanning microscopy.
6
Content available remote

Microstructure Changes of Nickel-Base Superalloys Induced by Interaction with Femtosecond Laser Beam

80%
Petronic S., Drecun-Nesic S., Milosavljevic A., Sedmak A., Popovic M., Kovacevic A.
Acta Physica Polonica A
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2009
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vol. 116
|
issue 4
550-552
EN
The investigation was performed on nickel-base superalloys, with nickel being the most influential alloying ingredient. After thermo-mechanical preparation and corresponding processing, femtosecond laser beam machining has been performed. The laser wavelength was 800 nm. The exposition time, during which the samples have been exposed to the pulses of femtosecond laser beam varied, as well as the average output power. The changes of both the output power and the exposition time enabled the samples to be irradiated with different total energy during each exposition. The changes in samples microstructure were observed with optical and scanning electron microscopy, with energy-dispersive spectrometry, and analyzed as well. Microhardness measurements of both base material and ablated spots have been performed.
7
Content available remote

Laser Interaction with Material - Theory, Experiments and Discrepancies

70%
Srećković M., Ilić J., Davidović M., Djokić B., Tomić Ž., Latinović Z., Družijanić D.
Acta Physica Polonica A
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2009
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vol. 116
|
issue 4
618-621
EN
The experimental treatment of chosen material with laser beams, starting from continuous wave up to fs pulses, produces the necessity to find the common and sophisticated theoretical approaches to interaction modeling. For chosen materials, some laser treatment and damage analyses are performed. The provoked stresses and parameters of transport processes (penetration depth) are calculated by using the programs for electrical circuit analyses. Some inconsistencies in the treatment of large area laser-material interaction are discussed.
8
Content available remote

The cubic period-distance relation for the Kate reversible pendulum

51%
Rossi M., Zaninetti L.
Open Physics
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2005
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vol. 3
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issue 4
636-659
EN
We describe the correct cubic relation between the mass configuration of a Kater reversible pendulum and its period of oscillation. From an analysis of its solutions we conclude that there could be as many as three distinct mass configurations for which the periods of small oscillations about the two pivots of the pendulum have the same value. We also discuss a real compound Kater pendulum that realizes this property.
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