ParLeda is a software library that provides the basic primitives for parallel ‎implementation of computational geometry applications. It can also be used in ‎implementing a parallel application that uses geometric data structures. The parallel ‎model that we use is based on a new heterogeneous parallel model HBSP, which is ‎based on BSP and is introduced here. ParLeda uses two main libraries that are widely ‎used: MPI for its message passing in the parallel environment and LEDA for its data ‎structures and computations. Dynamic load balancing and replicating C++ objects are ‎two key features of this library. This library was implemented after a survey in ‎research on parallel computational geometry algorithms and selection of their ‎common primitives‏.‏

Scattering of 15N ions with the energy of Elab = 23 MeV on the CH2(Au) target is investigated. Elastic scattering of these ions in the angular range of 7°-19° was measured by employing the silicon strip detector, “ LEDA” . Using the measured scattering data, deviation of ion beam, number of incident ions on the target and differential cross sections of the 12C(15N, 15N)12C elastic scattering in the angular range of 7°-19° were determined. Moreover, by applying the optical model and using the Fresco software, the scattering cross sections in the angular range of 0°-60° in the laboratory framework were obtained by entering the extrapolated optical parameters. The obtained cross section data were then compared with the experimental ones. The theoretical cross section data resulting from the optical potential exhibit meaningful difference with the experimental data obtained in this research work in the covered angular range.

The order Hymenoptera comprises an important group of insects, with ecological and economic importance, and serving as ecological indicators. Investigating the diversity and distribution of fauna is considered a prerequisite for biodiversity conservation. In this research, the hymenopteran fauna in mangrove forests on the southern coast of Iran were studied during 2021–2022. The collection was made by sweeping net and light trap. The survey revealed the presence of ten species and nine genera belonging to six families. Of which, two species, Ampulex assimilis Kohl, 1893 (Hym.: Ampulicidae) and Paridris leda Kozlov & Kononova, 1985 (Hym.: Scelionidae) are recorded for the first time for the Iranian fauna. Diagnostic characters of the new records and geographical distribution of all species are provided.

Purpose: This study aimed to identify the training needs of public libraries Alborz Province implemented.Methodology: This study applied a survey analysis. The study population consisted of librarians working in public libraries Alborz Province have formed a number of 107 people. The sample was determined using a sample of 84 patients who were randomly selected. The data collection tool was questionnaire and its reliability was confirmed by calculating Cronbach's alpha coefficient 917/0.Data analysis using descriptive, analytical and test a sample mean comparisons were performed using SPSS software.Findings: Most participants in the courses of basic and advanced courses ICDL and storytelling techniques and libraries and the role of training in enhancing the skills of collecting, organizing, and providing services and information technology Reference is high. The presence better educational classes, educational classes time in hours and university teacher training courses and the skills and training required in the future to become familiar with libraries intelligent systems, introduction to Internet information resources familiarity with the principles of professional ethics the libraries.Conclusion: About half of the employees have a history of twenty years, yet have the opportunity to upgrade and knowledge accumulation. Leda is essential for better planning in order to update library activities, according to the skills and interests of participants in the program, designed and implemented.