We apply graph theory to nd upper and lower bounds on the channel capacity of a serial, binary, rewritable medium in which consecutive locations may not store 1's, and consecutive locations may not be altered during a single rewriting pass. If the true capacity is close to the upper bound, then a trivial code is nearly optimal.

This article proposes a means by which benefits provided in international research collaborations might be employed to strengthen health care, research, and other capacities in less-developed countries. The Declaration of Helsinki and CIOMS Guidelines define certain expectations of benefits, but these requirements are ambiguous, logistically problematic, and studies suggest they are inconsisten...

This paper deals with the problem of computing channel capacity for wireless communications systems with multiantennas. The system is modelled using a transmit volume, a receive volume and a set of reflective scatterers. Based on the authors’ previous work on channel modelling of such a system, we give a multi-input-multi-output model for communications between arbitrary antenna arrays in two v...

We consider a cellular satellite system conceived to enhance the capabilities of the pan-European terrestrial system (GSM). This adopts EHF band and highly-inclined orbits. We present a preliminary assessment of system capacity based on asynchronous direct-sequence spreadspectrum multiple access (DS-SSMA). Performance is measured in terms of error probability achieved by If users simultaneously...

Introduction: A growing number of Muslim athletes now engage in international competition. This raises the question of the advice they should be given if a major event occurs during the month of Ramadan. Methods: A narrative review has been based upon books and extensive reviews completed by the author and other investigators. Results: Practical considerations hamper assessment of the effects o...

soil productivity is generally associated with poor nutrient status and the physical condition of the soil, but the effect of soil mineralogy on soil productivity has received little attention. in this qualitative study, interactions between mineralogy and physico-chemistry and their role on the productivity of two luvisols, an arenosol and a vertisol are investigated. minerals identified in th...

here, the concept of electric capacity on finsler spaces is introduced and the fundamentalconformal invariant property is proved, i.e. the capacity of a compact set on a connected non-compact finslermanifold is conformal invariant. this work enables mathematicians and theoretical physicists to become morefamiliar with the global finsler geometry and one of its new applications.