Laid to rest

Osler vindicated: the ghost of Flexner laid to rest.

The expressivist objection to prenatal diagnosis: can it be laid to rest?

Received 24 May 2007 Accepted 24 May 2007 Tom Shakespeare’s book Disability rights and wrongs is very rich and interesting and ought to be compulsory reading for anyone interested in the relation between disability and medical ethics. In my short contribution to this symposium on the book, I will focus on a particular aspect of his discussion of prenatal diagnosis and termination of pregnancy. ...

Preliminary Design of Spacecraft Attitude Control with Pulse-Width Pulse-Frequency Modulator for Rest-to-Rest Maneuvers

In this paper, the preferred region of design parameters for quasi-normalized equations of single-axis attitude control of rigid spacecraft using pulse-width pulse-frequency modulator (PWPFM) is presented for rest-to-rest maneuvers. Using the quasi-normalized equations for attitude control reduces the system parameters, that is, the moment of inertia, the filter gain, and the maximum torque of ...

Gravity-Compensated Robust Control for Micro-Macro Space Manipulators During a Rest to Rest Maneuver

Many space applications require robotic manipulators which have large workspace and are capable of precise motion. Micro-macro manipulators are considered as the best solution to this demand. Such systems consist of a long flexible arm and a short rigid arm. Kinematic redundancy and presence of unactuated flexible degrees of freedom, makes it difficult to control micro-macro manipulators. This ...

Skin development: Delta laid bare

Notch signalling is best known for its role in lateral inhibition, where it acts to prevent differentiation of cells neighbouring one that has 'won out' in a competition to differentiate. Recent results suggest that Notch signalling can work in the opposite way, and promote differentiation of the receiving cells.