The paper addresses quaternion-based energy and time optimal spacecraft reorientation in the presence of complex attitude constrained zones. Designing an optimal reorientation trajectory for a rigid body spacecraft is posed as a nonlinear optimal control problem. In this direction, attitude constrained zones are defined with respect to the onboard instrument under two categories, forbidden and ...

Objective- To describe the normal sonographic images of the soft tissues of the dorsal and palmar aspects of the fetlock region in the draught horses.   Design- Descriptive study.   Animals- Five clinically and radiographically normal draught male horses were used during this study.   Procedures- Horses were examined both radiographic and ultrasound ante mortem and post mortem. Based on the pro...

OBJECTIVE To review our experience of thoracic endovascular aortic repair (TEVAR) in patients with prior open aortic repair (OAR). MATERIALS AND METHODS Stent-grafts were deployed in the arch, descending thoracic and thoracoabdominal aortae of 39, 13 and 5 patients, respectively, and in a deteriorated extra-anatomical prosthesis in one. The access route was the femoral artery in 10 of 23 pati...

s _’ .*_ _ Ripariaq zones have &en shown to be important in smcturing veflebrgte communities and in maintaining biodiversity. We examined the [email protected] riparian zones in structuring small mammal Fmmuniti% ‘in a southern Appalachian watershed at Coweeta Hydr$pgical Laboratory, Macon County, &Jorth Carolina. We established pitfall and live-trap grids i? three rep@tes each of seeps, firstorder,, seco...

We determine a constitutive equation for developed three-dimensional granular flows based on series of discrete element method simulations. In order to capture non-local phenomena, normal stress differences, and secondary flows, we extend previously proposed temperature-sensitive rheological model by considering Rivlin-Ericksen tensors up second order. Three parameters are calibrated with the i...