Expert System for Threshold Spectra Analysis of Nitrogen Molecules

Bocvarski

2008

J. Phys.: Conf. Ser.

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An expert system for ensuring the reliability of the technological process of cold sheet metal forming L R Kashapova, D L Pankratov and P P Utyaganov Abstract. In this paper is presented development of the expert systems for threshold spectra analysis, starting from firstly developed expert system for atom threshold spectra analysis, up to the expert system for analysis more complex molecule threshold spectra (firstly two-atomic and then tree-atomic molecules). The goal of the expert systems application is to automate, speed up and improve process of spectra analysis. Interest for threshold spectra originates from the fact that, by studding them, it is possible obtained information about processes which happened on energies near reaction threshold. Also, in these spectra can be seen peaks that correspond to forbidden transitions and which can't be seen in the optical spectroscopy. For testing of the expert systems, we used the threshold spectra for the He atom, and N 2 and SO 2 molecules. All these spectra are obtained on threshold spectrometer in Institute of Physics in Zemun (Laboratory for Atomic Collision Processes). IntroductionIn process of studying atomic and molecular collision processes, the threshold spectroscopy method takes important place [1]. With this method is performed a detection of electrons with "zero" energy, i.e. electrons which have lost their incident energy in the non-elastic collisions. Because of that, by using a specific configuration of electric field, it is possible to separate aforementioned electrons from the others. With this is accomplished that a process is examined on reaction threshold, hence the name of this method. The importance of this method originates from the fact that it enables a detection of excited as well as vibrational states, along with a recognizing of resonant states.Expert systems presented in this paper are developed based on the backward chaining methodology and with a goal to analyze spectra obtained by threshold spectroscopy. For their development is used ESBT I2+ which in process of conclusion uses the aforementioned methodology that starts with goal and goes toward data. One of advantages of this methodology is that there is no conflict resolution, which can be complicated factor in process of practical exploitation of one expert system.In the case of threshold spectra analysis, which can be generalized on all kind of spectra in electron spectroscopy, an application of ES enables the following: an estimation of usability of experimentally obtained spectra for future analysis, selective extraction of physical events from events that originate from noise, identification of an energy states of atoms and molecules whose spectra are recorded, and analysis of identified states, with an aim to separate the vibrational levels and resonances.

Section: Expert System For Analysis Atom Threshold Spectramentioning

confidence: 99%

“…6-a. Next step is correction of peaks height [4]. After this part of ES work, the spectrum looks like one Fig.…”

Section: Expert System For Analysis Tri -Atomic Molecule Threshold Spmentioning

confidence: 99%

The expert systems for analysis of electron energy-loss spectra

Bocvarski

2008

J. Phys.: Conf. Ser.

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EXPERT SYSTEM FOR THRESHOLD SPECTRA ANALYSIS OF SO₂ MOLECULES

Bocvarski

2007

Int. J. Mod. Phys. C

In this paper an expert system is presented that was developed with the aim to analyze electron spectra on the threshold energies in collision with triatomic and polyatomic molecules. This expert system was made by updating the expert system for the analysis of the threshold spectra of two-atomic molecules. In contrast to the threshold spectra of two-atomic molecules, where were exist more or less defined structures of excited states, as well as vibrational levels, in the threshold spectra of triatomic molecules clearly defined structures almost do not exist. The application of the expert system in the process of triatomic and polyatomic molecules spectra analysis has an important role because it enables analysis of larger number of excited states, vibrational levels, and resonances, which can be missed in the analysis by classical methods, either because of low intensity or because of insufficiently defined separation of peaks in spectrum, which arise from the overlapping of a large number of peaks.

Expert System for Analysis of Spectra in Nuclear Metrology

Krstić

et al. 2008

Int. J. Mod. Phys. C

In this paper is described an expert system (ES) developed in order to enable the analysis of emission spectra, which are obtained by measurements of activities of radioactive elements, i.e., isotopes, actually cesium. In the structure of those spectra exists two parts: first on lower energies, which originates from the Compton effect, and second on higher energies, which contains the photopeak. The aforementioned ES is made to perform analysis of spectra in whole range of energies. Analysis of those spectra is very interesting because of the problem of environmental contamination by radio nuclides.