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This paper discusses the design activities of students in secondary school in France. Graphics tools are now part of the capacity of design professionals. It is therefore apt to reflect on their integration into the technological education. Has the use of intermediate graphical tools changed students' performance, and if so in what direction, in phase of seeking solutions through a design activity in a situation of teaching and learning? The influence of computer aided design (CAD) tools on design professional activities has been the subject of much research, but little has focused on student activity. Thus, analysing student work through an experimental device, we ask that students produce more solutions without using CAD tools. Do CAD activities encourage the modelling of a particular solution? Does drawing by hand before CAD activities support the production of various solutions and define them more precisely? Through the analysis of solutions developed by students, including traces of their activity (sketches, digital files), we test our hypotheses. [ABSTRACT FROM AUTHOR]

In this paper the information loss for fermionic superstrings 'superstring balls' in mini black holes at LHC by extending the Gottesman and Preskill method to string theory and calculate the information transformation from the collapsing matter to the state of outgoing Hawking radiation is calculated. It is found that for all finite values of ω, all information from all string emission processes experiences some degree of loss. It means that the string model is not sufficient to solve the information-loss problem. Then the fermionic superstring states at corresponding point are considered. The correspondence principle offered a unique opportunity to test the Horowitz and Maldacena mechanism at correspondence point 'the centre of mass energies around ( M/( g))'. To consider the super string states, a copy of the original Hilbert space is constructed with a set of operators of creation/annihilation that have the same anticommutation properties as the original ones. The total Hilbert space is the tensor product of the two spaces H⊗ H, where in this case H denotes the physical quantum states space of the fermionic string. It is shown that fermionic string states can be represented by a maximally entangled two-mode squeezed state of the physical and unphysical spaces of fermionic string. Also, the entropy for these string states is calculated. It is observed that black hole entropy matches the fermionic superstring entropy at transition point. This means that our result is consistent with correspondence principle and thus HM mechanism in string theory works. Finally the signature of fermionic string ball at LHC is studied. When superstring balls produce at LHC, they evaporate to Massive particles like Higgs boson. In fact string balls act as a factory for Higgs production. Then Higgs bosons decay to QCD matter. Thus an enhancement of QCD matter can be a signature of fermionic superstring ball at LHC. [ABSTRACT FROM AUTHOR]