Stability

This paper describes the analysis of L-band radiometric measurement data gathered with the synthetic aperture radiometer HUT-2D during several ground-based and airborne measurement campaigns. The radiometric data are analyzed from the instrument's performance point of view, aiming to verify the theoretical performance of an instrument of this kind and to assess the performance of the HUT-2D radiometer system in particular. The data sets considered for the study consist of measurements of well-known natural targets, such as cosmic background radiation, and measurements of pure water scenes, the brightness temperature of which is possible to model based on in situ measurements. We define four figures of merit, which are applicable for synthetic aperture radiometers. These are radiometric resolution, image bias, pixel-to-pixel random error, and temporal stability. Then, we use the selected data sets to assess these in the case of HUT-2D. The experimental results are discussed and compared to the theoretical values, where applicable. Also, we discuss possibilities to improve the presented performance. The main results of this paper are the consolidated performance parameters of the HUT-2D instrument. We study and discuss the properties of the error components related to the technology in a general level, and study the scalability of the errors as a function of the measured targets. In particular, the stability of the direction-dependent error component is pointed out, and a mitigation guideline is proposed.

Επιβλέπουσα Καθηγήτρια: ΝΑΣΚΟΥ-ΠΕΡΡΑΚΗ Παρασκευή Τηλ.: 2310 891499 Email: perraki@uom.gr Β΄ Μέλος Εξεταστικής Επιτροπής: ΜΠΕΛΛΟΥ ΦωτεινήΤηλ.: 2310 891479 Email: fbellou@uom.gr
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Λέξεις Κλειδιά:

ασφάλεια, ειρήνη, τάξη, σταθερότητα, ισχύς, συνεργασία, συγκρούσεις, περιπτωσιολογικές μελέτες, φάσμα, εκκρεμές, πλαίσιο, πρίσμα, νομιμότητα, νομιμοποίηση, δόγμα, στρατηγική αντίληψη, σύστημα, ηγεμονία, αρχή, επέμβαση, ευθύνη, προστασία"

Συμπέρανα ότι, το ΝΑΤΟ μετεξελίσσεται σε οργανισμό που έχει τα χαρακτηριστικά ενός διεθνούς περιφερειακού οργανισμού, σε παγκόσμια όμως διάσταση, όπου με βάση το δόγμα "Ευθύνη Προστασίας" (Responsibility to Protect), αναλαμβάνει ρόλο χωροφύλακα, που επιδιώκει τη διασφάλιση της διεθνούς ασφάλειας και του εσωτερικού τομέα ασφαλείας, σε οριακές συγκρούσεις ανά την υφήλιο, πχ Βοσνία, Κόσσοβο, Λιβύη και προσεχώς Συρία."

Nowadays there is an increase in the request for compounded medicines or extemporaneous formulations, mainly for situations that are not covered by the Pharmaceutical Industry. Compounded medicines must follow quality parameters that are required by law and are included in different pharmacopoeias. This review aims to present the main factors that condition compounded formulations stability and hence determine expiry dates.

Г. В. Гавардашвили, Э. Г. Кухалашвили, Т. Г. Супаташвили, И. Р. Иремашвили, И. А. Купарашвили, К. Г. Бзиава, Г. Т. Натрошвили. ОЦЕНКА РИСКОВ ПРОРЫВА ЖИНВАЛИЙСКОЙ ПЛОТИНЫ С УЧЕТОМ МЕТОДА «CAPRA»Georgia is one of the most vulnerable countries to natural disasters within South Caucasus Region. In recent years, the disaster risk has increased due to faulty land-using. Outstanding building codes lead to inadequate building construction. There is a lack of real data on natural disasters and the impact of mudflows, floods, debris flows etc. on land-use planning and prompt actions after above mentioned catastrophes. Therefore, it is important task to carry out assessments of critical structures sensitive to natural threats such as dams and reservoirs. In order to be able to improve the resistance of hydraulic engineering structures it is necessary to utilize a formal risk analysis framework, such as the Critical Asset and Portfolio Risk Analysis (CAPRA) method. The scientific article examin...

Abstract:- This paper details an original method for the stability analysis of mechatronic systems driven by asynchronous machines. The mathematical basis of the method and a few characteristics obtained with an adequate Matlab program are presented. The windows of the program for monitoring of the experimental tests are also depicted. Finally a series of experimental tests and the conclusions confirming the validity of the proposed method are presented. Key-Words:- stability, mechatronic system, asynchronous machine, variable frequency, parameters, software. 1

This work is aimed at looking into the flatness control of the crane detailing adopted mechanisms and approaches in order to be able to control this system and to solve problems encountered during its functioning. The control objective is the sway free transportation of the crane s load taking the commands of the crane operator into account. Based on the mathematical model linearizing and stabilizing control laws for the slewing and luffing motion are derived using the input/output linearization approach. The method allows for transportation of the payload to a selected point and ensures minimisation of its swings when the motion is finished. To achieve this goal a mathematical model of the control system of the displacement of the payload has been constructed. A theory of control which ensures swing free stop of the payload is presented. Selected results of numerical simulations are shown. At the end of this work, a comparative study between the real moving and the desired one has been presented.

This paper proposes a new H∞ yaw-moment control scheme using brake torque for improving vehicle performance and stability especially in high speed driving. Its characteristics is that only one brake is used for control depending on the vehicle state. Steering angles are modeled as a disturbance input to the system and the controller minimizes the difference between the performance of

A two dimensional model of Series RLC circuit is considered for discussion. The system possess only the trivial equilibrium point and local stability conditions are obtained. The phase portraits are obtained for suitable parameter values. Oscillations and damping effects are illustrated with numerical examples.