New lithic evidence of the Aurignacian in Hungary

The Aurignacian in Hungary is characterized by abundant bone points. “Classic” Aurignacian stone tool types such as nosed and carinated endscrapers are not well- represented in these assemblages. Recently, two Aurignacian sites with high frequencies of these endscrapers were found near Nagyréde, in the area of Mátra Mountains in northeast Hungary. The stone tool kit composition of these sites signifies a typologically diverse and unique Aurignacian appearance in Hungary

Formation of unilamellar dipalmitoylphosphatidylcholine vesicles promoted by Ca2+ ions: A small-angle neutron scattering study

Dipalmitoylphosphatidylcholine (DPPC) was hydrated in 0.2-60 mM solution of CaCl 2 in heavy water and thoroughly homogenized by freezing-thawing process. Small-angle neutron scattering (SANS) shows formation of unilamellar vesicles in the range 1-60 mM of CaCl 2. From the Kratky-Porod plot ln[I(Q)Q 2] vs. Q 2 of SANS intensity I(Q) in the range of scattering vectors Q corresponding to the interval 0.001 Å -2≤Q 2≤0.006 Å -2, the vesicle bilayer radius of gyration R g and the bilayer thickness parameter d g were obtained. The structure of the bilayer displays different behavior for the gel phase and the liquid-crystalline phase: In the gel phase (at 20°C), the values of d g indicate nonlinear changes in the lipid bilayer thickness, with a maximum at ∼5 mM CaCl 2. In the liquid-crystalline phase (at 60°C), the parameter of the lipid bilayer thickness d g=43.2±0.3 Å is constant within the concentration range 1≤c Ca≤40 mM. Vesicles prepared at 60 mM CaCl 2 show within experimental error, the same values of d g as pure DPPC unilamellar vesicles prepared by extrusion using polycarbonate filter with pores of diameter 500 Å

Novel Techniques For Model-Code Synchronization

The orientation of the current software development practice requires efficient model-based iterative solutions. The high costs of maintenance and evolution during the life cycle of the software can be reduced by using tool-aided iterative development. This paper presents how model-based iterative software development can be supported through efficient model-code change propagation. The presented approach facilitates bi-directional synchronization between the modified source code and the refined initial models. The backgrounds of the synchronization technique are three-way abstract syntax tree (AST) differencing and merging. The AST-based solution enables syntactically correct merge operations. OMG's Model-Driven Architecture describes a proposal for platform-specific model creation and source code generation. We extend this vision with the synchronization feature to assist the iterative development. Furthermore, a case study is also provided

GAS COMPRESSION BY JET PUMP COOLING

In the present state of art of the thermal engines using gaseous medium, the exhaustion temperature is often far beyond the ambient. The intake and the outlet of the working substance - mostly air, steam or other hot gases - require power resulting in reduction in net throughput of the engine. The power requirement can - in many cases - be reduced, eliminated or even extra power can be gained by application of the compression tube. The compression tube is a device, which increases the pressure of the flowing gaseous medium. The pressure increase comprises two well-known effects: the ejector effect and the effect of the cooling on the stagnation pressure of the flowing gas. The compression tube can be recommended for stationary thermal engines, such as Diesel engines, stationary gas turbines of flue gas removal systems of boilers or ovens. Since the compression tube cools the gas, thus if it is applied in the exhaustion system of the engine, other methods for use of the enthalpy of the exhaustion gas - e. g. recuperators, waste heat recovery boilers, etc. - are excluded as waste heat utilization, at least in the temperature range of the compression tube

Advantages of Open Source Based e-learning Tools in the Collaboration and Training in the Agricultural Education

Abstract. One of the primary benefits of open source software is that it reduces the costs to produce systems and services. Traditional proprietary software vendors are realizing this fact, and are beginning to build their closed software products quietly using lots of open source software. In the long-run, competition will force these cost savings to be passed to the consumer. In this paper the most important free and commercial e-Learning systems and their functional features, modules, standards, hardware and software requirements by Vendor’s Web sites and different e-Learning service portals are shortly summarized and compared. We selected the Moodle system within an European projects, which is a software package for producing Internet-based courses and web sites. It is an ongoing development project designed to support a social constructionist framework of education. The aim of our European project was to promote the use of multimedia knowledge in adult training / lifelong learning in order to facilitate competitiveness, employability and mobility of adults who are victims of the digital divide or of some of its components such as distance, initial level of knowledge, language, use of complex technologies. One of the results of the NODES project is that we introduced the Moodle system into the graduate, postgraduate PhD, adult trainings programmes and it is a very successful system as an educational portal system for our faculty. We are using some extended tools in Moodle such as the Word templates for easy making Moodle questionnaires, Covcell Audio/Video Conferencing Tool, Inwicast Mediacenter, Audio recorder, AutoView Presenter which allows you to put video on-line with synchronised slides