Directed signature scheme allows only a designated verifier to check the validity of the signature issued to him; and at the time of trouble or if necessary, any third party can verify the signature with the help of the signer or the designated verifier as well. Due to its merits, directed signature scheme is widely used in situations where the receiver’s privacy should be protected. Threshold ...

Plane geometry construction problems are difficult for many students. One of reasons is the fact, that process of solving and evaluation of this kind of tasks is time consuming and evaluation itself is a complicated problem. Consequently, students do not resolve as many problems as necessary to make them gain sufficient experience. Automatic evaluation of this kind of tasks is able to speed up ...

We recorded three mite species, Pergamasus (Thenargamasus) instatutus Athias-Henriot, 1967, (Pergamasus) laminarius Witaliński, 1971 and Holoparasitus ampullaris 1994, from Slovakia for the first time. Mites of genera Berlese, 1903 Oudemans, 1936 are predatory mites living mainly in a soil rotting organic matter Holarctic region with centre distribution Europe. Till now, P. was Austria Hungary,...

The aim of this article is to describe the history of brachytherapy in Poznań from the beginning of 20th century. Among the most important medical and oncological institutions that were created in Poznań at the beginning of twentieth century were: Surgical Clinic of Poznań University (City Hospital, Poznań), Transfiguration of the Lord Hospital (Poznań) and Radiology Faculty of Poznań Universit...

In order to ensure the continuing expansion and success of electronic commerce, the issue of how to assess product quality of items sold over the Internet must be addressed. The formal literature of microeconomics presents a conceptual framework for this assessment that is applied in the case study presented in this paper. The type of transaction studied is online auction transactions conducted...

a spring-stream called “ghadamgah” in fars province, southern iran, which holds more than 60 aquatic vertebrate and plant species belonging to 46 genera and 33 families is almost the biologically richest water body of fars province. the diversity is especially in its endemic fishes which are under threats nowadays. one of the factors, if not the one, which has kept this system more or less in i...

Pseudophilautus stellatus (Kelaart 1853) has been rediscovered from the Peak Wilderness, Central Hills of Sri Lanka. The species, till now known only from its lost holotype, was the first shrub frog described from Sri Lanka, and had not been reported since then. It was thought to have become extinct for nearly 157 years, being the amphibian species "lost" for the longest amount of time. Here we...

―We have also come to this hallowed spot to remind America of the fierce urgency of now. This is no time to engage in the luxury of cooling off or to take the tranquilizing drug of gradualism. Now is the time to make real the promises of democracy. Now is the time to rise from the dark and desolate valley of segregation to the sunlit path of racial justice. Now is the time to lift our nation fr...