We consider diffusion on a tree with nodes that randomly switch between allowing and prohibiting particles to pass. We find exact expressions for various splitting probabilities and mean first passage times for a single diffusing particle and show how the many parameters in the problem, such as the node gating statistics and tree topology, contribute to these exit statistics. We also consider a...

This review aimed to give a brief account on the principles, techniques and applications for in vitro production (IVP) of embryos and related biotechnologies. IVP of embryos provides an excellent source of low cost embryos for basic research on developmental biology and physiology and for the application of emerging biotechnologies such as nuclear transfer, production of transgenic animals, emb...

{ We propose a scheme for the establishment of multimedia delivery channels in WAN environments that support the timing and reliability requirements of multimedia applications while allowing for better utilization of the network bandwidth. These virtual, end-to-end channels from sources to destination consist of multiple segments that (a) have a resource reservation scheme that is able to issue...

Recently, wireless sensor network (WSN) has become a promising technology with a wide range of applications such as supply chain monitoring and environment surveillance. It is typically composed of multiple tiny devices equipped with limited sensing, computing and wireless communication capabilities. Design of such networks presents several technique challenges while dealing with various requir...

In recent years reconstitution of bronchial continuity, after simple division or the removal of a circumferential section of the wall, has been the subject of experimental work. On the other hand, clinical observations of bronchial anastomosis in man are still rare. In the course of a difficult resection of the left lower lobe and lingula we accidentally divided the stem bronchus, and acquainta...

BACKGROUND Stress shielding in the cemented hip prosthesis occurs due to the mismatching in the mechanical properties of metallic stem and bone. This mismatching in properties is considered as one of the main reasons for implant loosening. Therefore, a new stem material in orthopedic surgery is still required. In the present study, 3D finite element modeling is used for evaluating the artificia...