103,088 research outputs found
Light and Darkness in Post-Apartheid South African Fiction. Strategies of Self-Reconstruction
No full textIl saggio analizza due romanzi del periodo post-apartheid sudafricano, The Impostor di D. Galgut e Playing in the Light di Zoe Wicomb, entrambi pubblicati nel 2006, mettendo in luce la difficile ricostruzione della memoria del passato nazionale, pubblico e privato
Bioetica e diritto (cap. 4); Genetica, genomica e diritto (cap. 7); Diritto e diritti degli animali (cap. 10); La prospettiva biogiuridica su ambiente e organismi geneticamente modificati (Cap. 13)
No full textI saggi esplorano i profili bioetico- giuridici legati alluso delle biotecnologie genetiche, in ambito medico, animale e ambiental
Consumo di suolo ed ecosistemi. Analisi quantitative e prospettive di diagnosi qualitative.
No full textCon oltre dieci proposte di legge attualmente all’esame delle commissioni parlamentari il “consumo di suolo” è stato riconosciuto, anche in Italia, come una patologia territoriale dalle molteplici conseguenze negative che vanno dall’erosione/frammentazione degli ecosistemi, alla riduzione dei servizi da loro erogati, all’alterazione dei regimi idrici, all’aumento del dispendio energetico con profonde ripercussioni anche sulla qualità della vita a medio termine e sul paesaggio nel senso più ampio (Falqui et alii, 2011; Romano & Zullo, 2013). Con la locuzione “consumo di suolo” viene individuato da diversi anni il fenomeno della conversione urbana della superficie territoriale, con asportazione degli strati superficiali del suolo e la loro sostituzione con coperture artificiali, dove queste ultime possono o meno estendersi anche in verticale. Sono attualmente in corso diversi tentativi di classificazione delle superfici “artificializzate” che tendono ad individuare le categorie alle quali poi far corrispondere i numerosi effetti ambientali negativi. E’ proprio questa classificazione uno dei punti critici attuali della ricerca sul fenomeno, in quanto non ci sono database “istituzionali” a scale adeguate che possano fornire un dato ufficiale, omogeneo e attendibile, mentre c’è invece una discreta proliferazione di informazioni provenienti da metodologie e fonti pseudoscientifiche. Si tratta di una questione che merita, per la sua importanza-chiave, alcune precisazioni.
Un primo aspetto protocollare dei dati riguarda le tipologie di impegno di suolo trasformato da censire e che possono distinguersi per modalità di utilizzazione o di sostituzione dello strato pedologico
Algebraic entropy for algebraic maps
No full textWe propose an extension of the concept of algebraic entropy, as introduced by Bellon and Viallet for rational maps, to algebraic maps (or correspondences) of a certain kind. The corresponding entropy is an index of the complexity of the map. The definition inherits the basic properties from the definition of entropy for rational maps. We give an example with positive entropy, as well as two examples taken from the theory of Backlund transformations
Advances in the development of an Instrumented Human Head Surrogate for Brain Strain Experimental Evaluation during Impacts
No full textINTRODUCTION. The development of biofidelic head models is crucial since head injuries represent the most
likely outcome after a traumatic event, often leading to brain damage or death. To predict injuries and test
protective gear, several criteria were developed [1]. To improve the knowledge in this field, we developed an
Instrumented Human Head Surrogate (IHHS) [2]. New developments of this surrogate are aiming to improve the
robustness of the model with a redesigned skull, increase anatomical bio fidelity with the inclusion of falx cerebri
and tentorium cerebelli, and add more feedback with the inclusion of innovative sensors[3].
METHODS. An MRI scan of a 50th percentile male human head (scalp, skull, and brain) was imported into
Meshmixer and simplified for 3D printing. The skull model was divided in two parts joined and sealed thanks to
an indent and screws. A flat bottom base allows for connecting neck surrogates. The skull was 3D printed in PA12
using SLS technique. Brain and scalp models were used to generate moulds used for rubber casting of soft tissue
surrogates. Surrogate brain was casted using Platsil Gel 0030 silicone rubber and a Deadener in a multi-step
process embedding 3-axial accelerometers, gyros, and triads/hexads of miniature pressure sensors such as the
MAPS [3]. Skin was casted using Platsil Gel 10. Falx Cerebri and Tentorium Cerebelli were derived from the
brain model using Boolean operators and casted using Platsil gel 25. Pendulum and a drop test bench were set-up.
RESULTS. The brain with embedded sensors will be casted and assembled with skull, and skin in order to perform
impact tests with and without neck involvement. Preliminary results will be presented at the conference.
DISCUSSION AND CONCLUSIONS. We expect that these advances will improve the anatomical detail with
the inclusion of falx and tentorium and skull robustness against repeated impacts. Moreover, MAPS sensor will
allow studying dynamic multiaxial stress states in the brain during complex impact situations.
REFERENCES.
[1] Zhan X. et al., The relationship between brain injury criteria and brain strain across different types of head
impacts can be different, https://doi.org/10.1098/rsif.2021.0260, Journal of the Royal Society Interface, 6-2021.
[2] Petrone, N.et al., Feasibility of using a novel instrumented human head surrogate to measure helmet, head and
brain kinematics and intracranial pressure during multidirectional impact tests, J. Sci. Med. Sport 2019, 4–10,
doi:10.1016/j.jsams.2019.05.015.
[3] Zullo G. et al., A Novel Multi-Axial Pressure Sensor Probe for Measuring Triaxial Stress States Inside Soft
Materials, Sensors 2021, 21(10), 3487; https://doi.org/10.3390/s21103487
“Revising a Victorian Symbol. The Crystal Palace across Contemporary Literature and the Arts”.
No full textScattered subspaces and related codes
No full textAfter a seminal paper by Shekeey (Adv Math Commun 10(3):475-488, 2016), a connection between maximum h-scattered Fq-subspaces of V(r, qn) and maximum rank distance (MRD) codes has been established in the extremal cases h= 1 and h= r- 1. In this paper, we propose a connection for any h∈ { 1 , ... , r- 1 } , extending and unifying all the previously known ones. As a consequence, we obtain examples of non-square MRD codes which are not equivalent to generalized Gabidulin or twisted Gabidulin codes. We show that, up to equivalence, MRD codes having the same parameters as the ones in our connection come from an h-scattered subspace. Also, we determine the weight distribution of codes related to the geometric counterpart of maximum h-scattered subspaces
On the intersection problem for linear sets in the projective line
No full textThe aim of this paper is to investigate the intersection problem between two linear sets in the projective line over a finite field. In particular, we analyze the intersection between two clubs with possibly different maximum fields of linearity. We also consider the intersection between a certain linear set of maximum rank and any other linear set of the same rank. The strategy relies on the study of certain algebraic curves whose rational points describe the intersection of the two linear sets. Among other geometric and algebraic tools, function field theory and the Hasse–Weil bound play a crucial role. As an application, we give asymptotic results on semifields of BEL-rank two
- …
