نتایج جستجو برای: levallois technique
تعداد نتایج: 611459 فیلتر نتایج به سال:
due to the limiting workspace of parallel manipulator and regarding to finding the trajectory planning of singularity free at workspace is difficult, so finding a best solution that can develop a technique to determine the singularity-free zones in the workspace of parallel manipulators is highly important. in this thesis a simple and new technique are presented to determine the maximal singula...
in this thesis, a better reaction conditions for the synthesis of spirobarbiturates catalyzed by task-specific ionic liquid (2-hydroxy-n-(2-hydroxyethyl)-n,n-dimethylethanaminium formate), calcium hypochlorite ca(ocl)2 or n-bromosuccinimide (nbs) in the presence of water at room temperature by ultrasonic technique is provided. the design and synthesis of spirocycles is a challenging task becaus...
During the summer of 2019, Bacton to Walcott Coastal Management Scheme involved emplacement on foreshore 1.8 million cubic metres sand and gravel dredged from submerged sediments Palaeo-Yare in southern North Sea 11 km off Great Yarmouth. following 2-year period, an active group collectors identified Palaeolithic artefacts eroding these sediments, including Levallois cores flakes, cordiform han...
The quartz component of the Champs de Bossuet (CdB) industry has been subject technological and techno-functional analyses focused on ergonomic characterization percussive tools related to their morphologies, dimensions masses but especially Active Percussion Zone (APZ) (morphology, extent, location). After assessing position held by in component, they will be described basis a subdivision into...
The Arabian Peninsula is a key region for understanding hominin dispersals and the effect of climate change on prehistoric demography, although little information on these topics is presently available owing to the poor preservation of archaeological sites in this desert environment. Here, we describe the discovery of three stratified and buried archaeological sites in the Nefud Desert, which i...
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