Key Establishment is one of the most intriguing, fascinating and deeply studied problems in Cryptography. In this paper we propose a brief excursus among ideas and techniques that during the last years have been applied in a variety of settings, in order to design suitable and often mathematically delightful protocols to solve this issue. The presentation uses a very simple language: it is basi...

The main objective of this project is handling the large numbers of faults in F.P.G.A. configurable logic blocks. A key novel feature is the reuse of defective logic blocks to increase the number of effective spares and extend the mission life. To increase fault tolerance, we not only use nonfaulty parts of defective or partially faulty logic blocks, but we also use faulty parts of defective lo...

Haemochorial placentation, as it occurs in the human and other primate and rodent species, requires a connection of the placenta with supplying maternal (uteroplacental) arteries. Very little is known of the initial stages but endovascular trophoblast invasion seems to represent an essential element for further elaboration of an adequate uteroplacental circulation. In the human, endovascular tr...

The extensive use of the Internet, for exchanging information, requesting and offering services make us to interact with unknown entities. Human use trust to facilitate interaction and accept the risk, when complete information is unavailable. In such situations, trust establishment mechanisms enable establishment of trust between unknown entities. Trust is a complex concept to define stringent...

We propose a new class of key establishment schemes which are based on geometric generalizations of the classical Diffie-Hellman. The simplest of our schemes – based on the geometry of the unit circle – uses only multiplication of rational numbers by integers and addition of rational numbers in its key creation. Its first computer implementation works significantly faster than all known impleme...

The gap between marginal revenues and marginal costs of inputs (i.e., distortions or wedges) at establishments potentially lower aggregate total factor productivity (TFP) by preventing efficient allocation of resources among incumbents, deterring entry and exit, and affecting technology choices. We investigate the impacts of distortions on aggregate TFP, entry and exit, and establishment-level ...

The unicellular yeast Saccharomyces cerevisiae is a model system for the establishment of cell polarity. Yeast cells proliferate by budding, which involves specialization of a small patch of the mother cell cortex and polarization of many cell constituents towards that patch, promoting growth of the bud. Genetic approaches have uncovered a large number of genes involved in these processes, yiel...

heavy metal hyperaccumulators have recently attracted considerable attention in remediation of an area's pollutants. lead (pb) is one of the main pollutant heavy metals that its relatively high concentration have been reported in some environments. in present study, the potential of turfgrass tolerance, regarding seed germination and plant establishment were evaluated, in different concent...

Wormwood sagebrush (Artemisia sieberi Besser) is one of the most widely distributed shrub species in Iran and Turkistan steppes, its establishment on dry lands has generally been proven difficult because of low seedling vigor, inability to compete with herbaceous species, poor seed quality, and altered edaphic conditions. In order to evaluation of planting methods and seedling establishment, se...