menorrhagia is the most common symptom that is experienced by women with bleeding disorders. von willebrand disease (vwd) is the most common congenital human bleeding disorder that is manifested as a quantitative deficiency in von willebrand factor (vwf) or dysfunction of this factor. the frequency of vwd is similar in both men and women. however, vwd is more readily detected in women due to th...

Let A be a differential graded algebra with cohomology ring HA. A graded module over HA is called realisable if it is (up to direct summands) of the form HM for some differential graded A-module M . Benson, Krause and Schwede have stated a local and a global obstruction for realisability. The global obstruction is given by the Hochschild class determined by the secondary multiplication of the A...

Der zuverlässigen Lokalisierung chirurgischer Instrumente in Relation zum Patientenkoordinatensystem kommt in der computerunterstützten Chirurgie entscheidende Bedeutung zu. Aufgrund ihrer weiten Verbreitung im klinischen Alltag können optische Trackingsysteme als Standardverfahren für diese Aufgabe angesehen werden. Ein Nachteil von optischen Trackingsystemen liegt in der zwingend erforderlich...

The concept of entropy is fundamental for many branches of physics and other sciences dealing with systems which reveal a certain degree of complexity and disorder. As stressed in the monograph 1, ‘‘entropy is not a single concept but rather a family of notions". In relation to quantum theory, the mainstream of development is formed by four main overlapping lines. They can be referred to as the...

Transmission of classical information using quantum objects such as polarized photons is studied. The classical (Shannon) channel capacity and its relation to quantum (von Neumann) channel capacity is investigated for various receiver arrangements. A quantum channel with transmission impairment caused by attenuation and random polarization noise is considered. It is shown that the maximal (von ...

In this article we discuss important discoveries in relation to the anatomy and physiology of the ear from Renaissance to present. Before the Renaissance, there was a paucity of knowledge of the anatomy of the ear, because of the relative inaccessibility of the temporal bone and the general perception that human dissections should not be conducted. It was not until the sixteenth century that th...

Ocular filters in the eyes of many vertebrates, including humans, absorb wavelengths shorter than approximately 400nm. These filters prevent the beta-band of a visual pigment from being exposed to ultraviolet radiation, essentially narrowing the spectral sensitivity of the different photoreceptor classes. A comparison of different hypothetical visual systems is used to show that von Kries colou...

The state space of a finite quantum system is identified with the set of positive semidefinite matrices of trace 1. The set of all strictly positive definite matrices of trace 1 becomes naturally a differentiable manifold and the Bogoliubov–Kubo– Mori scalar product defines a Riemannian structure on it. Reference 4 tells about the relation of this metric to the von Neumann entropy functional. I...

We investigate the spreading of information in a Bose-Hubbard system after a sudden parameter change. In particular, we study the time-evolution of correlations and entanglement following a quench. The investigated quantities show a light-cone like evolution, i.e. the spreading with a finite velocity. We discuss the relation of this veloctiy to other characteristic velocities of the system, lik...