in this paper, we try to use modeling based on singular perturbation theory, in order to control satellite attitude during the wide rolling angle maneuvering through nonlinear h∞ control strategy. differential equations describing dynamics of the satellite are presented first, and by choosing the appropriate dynamic model for actuators and based on the standard singular perturbation model, the ...

Deoxynucleic guanidine (DNG), a DNA analogue in which positively charged guanidine replaces the phosphodiester linkages, tethering to Hoechst 33258 fluorophore by varying lengths has been synthesized. A pentameric thymidine DNG was synthesized on solid phase in the 3' --> 5' direction that allowed stepwise incorporation of straight chain amino acid linkers and a bis-benzimidazole (Hoechst 33258...

3-Acylmethylidene-3,4-dihydroquinoxalin-2(1H)-ones are compounds which possess a wide range of physical and pharmaceutical applications. These compounds can be easily prepared by cyclocondensation of o-phenylenediamines and aroylpyruvates. Unsymmetrically substituted o-phenylenediamines can be obtained form regioisomeric mixtures of 3,4-dihydroquinoxalin-2(1H)-ones. It is often quite difficult ...

the classical test theory (ctt) and item response theory (irt) are widely used in construction and analysis of exams and questionnaires. because of the various shortcomings of ctt, irt has been designed. even though irt has overcome most of the limitations of ctt and has made computer adaptive testing possible, it is still important to point out that not enough reasons exist to totally discard ...

bourdieu’s sociological theory contains all the elements necessary to form a political theory. through reviewing the works of bourdieu attempts have been made in the present paper to discuss those elements and also to reconstruct a political theory by combining them in a theoretical framework. this is a new attempt and has not been yet accomplished. therefore, in the present paper attempts have...

the auther first defines that a theory is an interrrelated set of definitions and propositions, put forth to anticipate and explain the phenomena by dint of recognizing the relation between factors.the developmental theory, ascientific theory based on genetic methods aims to render a new organizattioin of the data and the relevant knowledge.upon this, piaget proviedes a co-variational relation ...

objectives: the purpose of this study was to compare the relationship between theory of mind and inhibitory responses in normal children and adhd. methods: this study is descriptive study, a sample size of 25 patients adhd children and 30 normal children, who were randomly selected. research instruments are questionnaires theory of mind and computerized stroop test. results: the results showed ...

social interaction requires the ability to understand people’s mental states (their intentions, desires and believes). the ability for attributing mental states is called “theory of mind.” theory of mind leads the person to explain and predict behavior. researchers showed a great interest in the relation of language and mind/language and thought. some researchers focused on methodological conce...