Abstract The paper presents a novel application of the State Dependent Riccati Equation (SDRE) guidance approach with state constraints for chaser spacecraft in close proximity passive target. dynamics are described by full 6 degree freedom rigid-body relative motion. final trajectory is defined passively safe approaching cone, which acts as path constraint and follows attitude motion A Near Re...

In this paper, we considered composition operators on weighted Hilbert spaces of analytic functions and  observed that a formula for the  essential norm, gives a Hilbert-Schmidt characterization and characterizes the membership in Schatten-class for these operators. Also, closed range composition operators  are investigated.

background : femoral shaft fractures are major causes of mortality and morbidity and are managed with intramedullary nailing (imn). in this study we compared the results of open and closed nailing in femoral shaft fractures. between 1993 and 2001 we managed 136 femoral shaft fractures by imn (81 closed and 55 open nailings) methods : in 120 patients with mean age of 36.2 years. the mean time of...

introduction: restoration of normal anatomic alignment is a key component of the treatment of distal radius fractures (drf). this study aimed to evaluate the accuracy of ultrasonography (us) in determining the adequacy of closed reduction in these fractures. methods : drf patients admitted to the emergency department of al-zahra hospital, isfahan, iran from september 2011 to 2012, were enrolled...

In this paper, the special attention is given to the  product of two  modular operators, and when at least one of them is EP, some interesting results is made, so the equivalent conditions are presented  that imply  the product of operators is EP. Also, some conditions are provided, for which the reverse order law is hold. Furthermore, it is proved  that $P(RPQ)$ is idempotent, if $RPQ$†</...