We prove some general statements on stability conditions of CalabiYau surfaces and discuss the stability manifold of the cotangent bundle of P. Our primary interest is in spherical objects.

The aim of this study was to investigate the initial stability of mini-implants when placed slanting or perpendicular to the bone surface, and to examine the effects of differences in tractional direction. Titanium mini-implants were inserted into rabbit nasal bones, slanting (60 degrees , 120 degrees ) or perpendicular (90 degrees ) to the bone surface. These implants were then loaded with a f...

ABSTRACT In order to evaluate the effect of countersinking on dental implants primary stability installed in low density bones, thirty dental implants were installed in the most proximal region of oxen ribs and grouped as follow: Group1: Fifteen implants installed by standard drilling with countersinking, Group2: Fifteen implants installed by standard drilling without countersinking. The gradua...

BACKGROUND The quality of bone is an important factor in the successful implant treatment, and it is evident that higher implant failure is more likely in poor quality of bone. The primary stability of oral implants related to resistance to micromotion during healing is influenced by bone quality, surgical technique, and implant design. PURPOSES The aims of this biomechanical study were to ex...

INTRODUCTION To improve patient comfort, deviations from the very successful standard osseointegration protocol are being developed. To keep implant failure rates as low as possible, the most perfect treatment planning and a good patient selection are extremely important. Because bone density plays an important role in implant outcome, known relations of bone density could improve treatment pla...

We present a method to design distributed generation and demand control schemes for primary frequency regulation in power networks that guarantee asymptotic stability and ensure fairness of allocation. We impose a passivity condition on net power supply variables and provide explicit steady state conditions on a general class of generation and demand control dynamics that ensure convergence of ...

Detailed exuminution of the temperutLtre dependence of the n.m.r. spectra of 3,3-dimeth;,-lbut.,-lmagnesium chloride and bis(3,3-dimethvlbutyl)magnesium indicates that inversiott of configuration at the-CHzMg center oc' curs rapidly in ether solution at room temperature. Activation parameters for the inversiott reactiotts ure E,, : ]l t 2 kcal.f rnole, A : l}c'a = t'5 sec.-t, ond