1,355,083 research outputs found
Tangential Tallini sets in finite Grassmannians of lines
No full textAbstractA Tallini set in a semilinear space is a set B of points, such that each line not contained in B intersects B in at most two points. In this paper, the following notion of a tangential Tallini set in the Grassmannian Γn,1,q, q odd, is investigated: a Tallini set is called tangential when it meets every ruled plane (i.e. the set of lines contained in a plane of PG(n,q)) in either q+1 or q2+q+1 elements. A Tallini set QB in PG(n,q) can be associated with each tangential Tallini set B in Γn,1,q. Each ℓ∈B is a line of PG(n,q) intersecting QB in either 0, or 1, or q+1 points; when n≠4 and B is covered by (n-2)-dimensional projective subspaces of Γn,1,q the first case does not occur. If B is a tangential Tallini set in Γn,1,q covered by (n-2)-dimensional subspaces, any of which is in PG(n,q) the set of all lines through a point and in a hyperplane, then either QB is a quadric, and B is the set of all lines contained in, or tangent to, QB, or B is a linear complex
Affine Tallini sets and Grassmannians
No full textAbstract. In 1982/1983 A. Bichara and F. Mazzocca characterized the Grassmann space Gr(h;A)
of index h of an affine space A of dimension at least 3 over a skew-field K by means of the intersection
properties of the three disjoint families of maximal singular subspaces of Gr(h;A) and,
till now, their result represents the only known characterization of Gr(h;A). If K is a commutative
field and A has finite dimension m, then the image Gr(h;A)} under the well known Pl ̈ucker
morphism } is a proper subset Am;h;K of PG(M;K), called the affine Grassmannian
of the h-subspaces of A. The aim of this paper is to introduce the notion of Affine Tallini
Set and provide a natural and intrinsic characterization of Am;h;K from the point-line geometry
point of view. More precisely, we prove that if a projective space over a skew-field K contains an
Affine Tallini Set Δ satisfying suitable axioms on “perp” of lines, then the skew-field K is forced
to be a commutative field and Δ is an affine Grassmannian, up to projections. Furthermore, several
results concerning Affine Tallini Sets are stated and proved
On Efficient Second-Order Spectral-Null Codes using Sets of m1-Balancing Functions
No full textA new efficient coding scheme is given for second-order spectral-null (2-OSN) codes. The new method applies the Knuth's optimal parallel decoding scheme for balanced (i.e., 1-OSN) codes to the random walk method introduced by Tallini and Bose to design 2-OSN codes. If k IN is the length of a 1-OSN code then the new 2-OSN coding scheme has length n = k+r IN with an extra redundancy of r 2 log2 k + (1/2) log2 log2 k - 0.674 check bits. The whole coding process requires O(n log n) bit operations and 0(n) bit memory elements. © 2013 IEEE
A review of the properties of recycled and waste materials for energy refurbishment of existing buildings towards the requirements of NZEB
No full textIn Europe buildings account for 40% to 50% of total energy consumption and the largest greenhouse gases emitters and urgent measures and valid instruments are therefore required to improve energy saving, use of renewable sources in moving towards a sustainable materials management where waste becomes a "resource". In this context, there is an increase in research into development and manufacturing of new eco-friendly building envelope components from recycled and waste materials as high value-added good circular economy practice. Waste management may have significant effects in the sector of sustainable building the ultimate objective being the alternative construction materials replacing traditional materials: the development of innovative techniques aims to incorporate wastes into the production of building materials - for examples rubber, fly ash and sludge, etc. - to enhance thermal insulation properties. An effort in the sustainability in building design process is to develop researches aimed at enhancing thermal performance of components using materials capable of reusing a high waste content. The goal of this paper is to examine the technical feasibility of using inert waste materials from the combustion of municipal solid waste or solid recovered fuel and highlight changes in thermal characteristics (thermal conductivity, specific heat and density) by adding recycled and waste materials to the construction materials. The paper explores the potential of the use of thus obtained materials for the energy-refurbishment of existing buildings or with the challenge of meeting stringent energy consumption limits which are typical of a NZEB (net-zero energy building)
Evaluation methodology for energy efficiency measures in industry and service sector
No full textDirective 2012/27/EU, transposed in Italy with Decree of 4 July 2014 No102, a common framework of measures for the promotion of energy efficiency in European Union, is an innovative tool for improvement of energy efficiency and also necessary to undertake main objective of European Union (save 20% of primary energy consumption by 2020). Large enterprises and energy-intensive firms, except those having an energy management system (EnMS) according to ISO 50001 or compliant with EMAS Eco-Management and Audit Scheme or ISO 14001 fall under obligations and must be carry out energy audits every 4 years starting by December 2015 having "SMART" requirements: be Specific, Measurable, Accessible, Realistic, Time related. The analysis on a sample of Italian companies, mainly of small and medium enterprises (SME) in industry and the service sector, was conducted. Energy audit was carried out to identify Energy Company Profile, rationalize energy consumption to increase energy efficiency, assessing potential for energy savings and reducing of environmental impact. For any business context a series of energy efficiency measures has been proposed, selecting high profitability energy saving options by applying a priority criterion. Technical and economic indicators were reported on best practices focusing on tertiary sector and also industry. The study, starting from the feasibility assessments, aims to establish a possible correlation between energy performance indicators (EnPIs) and a limited number of parameters of the energy systems, in terms of production, operation and power consumption. Comparative assessment of energy-saving measures provides an useful method for assessing applicability of standard energy-saving measures in similar contexts and cost-effectiveness of solutions, as a function of a limited number of parameters
Nuovi dati sulla sequenza stratigrafica quaternaria dell'area Roio-Pianola (L'Aquila - Abruzzo)
No full textNuovi dati sulla stratigrafia quaternaria e sulla geomorfologia dell'area Roio - Pianola (L'Aquila, Abruzzo)
No full textEpidermal growth factor receptor (EGFR) targeted therapies in non-small cell lung cancer (NSCLC).
No full textMetro G, Finocchiaro G, Toschi L, Bartolini S, Magrini E, Cancellieri A, Trisolini R, Castaldini L, Tallini G, Crino' L, Cappuzzo F. Epidermal growth factor receptor (EGFR) targeted therapies in non-small cell lung cancer (NSCLC). Reviews on recent clinical trials. 2006;1:1-13
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