509 research outputs found
A curve depicting the sea-level changes in the Carmel coast. (J. McCarthy and E. Galili).
No full textA curve depicting the sea-level changes in the Carmel coast. (J. McCarthy and E. Galili).</p
THE DISCIPLINE-CULTURE MODEL AND CONCEPTUAL ANALYSIS IN SCIENCE EDUCATION:THE CASE OF QUANTUM FIELD THEORY
No full textThe contribution concerns the results of a study exploiting the educational and cultural potential of a topic from contemporary physics developed within the PhD thesis of the first author. The study concerns the application of the Discipline-Culture Model (DCM), suggested by Tseitlin and Galili (2005) for demonstrating the cultural relevance of the equation considered emblematic in contemporary physics: the Klein Gordon Equation (KGE).
The study is framed within the general problem of reconstructing, from an educational point of view, of the main conceptual steps that took place in modelling object and interaction from classical to contemporary physics.
The study, carried out in a collaboration between the physics education researchers of Bologna and Jerusalem, has been developed in three steps: i) analysis of university textbooks; ii) analysis of data collected by means of interviews and questionnaire to experts; iii) re-analysis of KGE in the light of the DCM.
The main results concern: (a) the revealed problematic educational issues related to the lack of a cultural perspective in teaching KGE and, in general, in Quantum Field Theory (QFT) teaching; and (b) the effectiveness of the DCM as a perspective for reanalysing the content knowledge about KGE and exploiting its cultural and educational value
Introduction: Early Television Historiographies
No full textIssue introduction by the special issue editor Doron Galili
The discipline - culture model and conceptual analysis in science education: the case of teaching quantum field theory
No full textThe contribution concerns the results of a study exploiting the educational and cultural potential of a topic from contemporary physics
developed within the PhD thesis of the first author. The study concerns the application of the Discipline-Culture Model (DCM), suggested by Tseitlin and Galili (2005) for demonstrating the cultural relevance of the equation considered emblematic in contemporary physics: the Klein Gordon Equation (KGE). The study is framed within the general problem of reconstructing, from an educational point of view, of the main conceptual steps that took place in modelling object and interaction from classical to contemporary physics. The study, carried out in a collaboration between the physics education researchers of Bologna and Jerusalem, has been developed in three steps: i) analysis of university textbooks; ii) analysis of data collected by means of interviews and questionnaire to experts; iii) re-analysis of KGE in the light of the DCM. The main results concern: (a) the revealed problematic educational issues related to the lack of a cultural perspective in teaching KGE and, in general, in Quantum Field Theory (QFT) teaching; and (b) the effectiveness of the DCM as a perspective for reanalysing the content knowledge about KGE and exploiting its cultural and educational value
In-fiber subpicosecond pulse shaping for nonlinear optical telecommunication data processing at 640 Gbit/s
No full textWe review recent work on all-fiber (long-period fiber grating) devices for optical pulse shaping, particularly flat-top pulse generation, down to the subpicosecond range and their application for nonlinear switching (demultiplexing) of optical time-division multiplexed (OTDM) data signals in fiber-optic telecommunication links operating up to 640 Gbit/s. Experiments are presented demonstrating error-free 640-to-10 Gbit/s demultiplexing of the 64 tributary channels using the generated flat-top pulses for temporal gating in a Kerr-effect-based nonlinear optical loop mirror. The use of flat-top pulses has critical benefits in the demultiplexing process, including a significantly increased timing-jitter tolerance (up to ~500 fs, i.e., 30% of the bit period) and the associated improvement in the bit-error-rate performance (e.g., with a sensitivity increase of up to ~13 dB as compared with the use of Gaussian-like gating pulses). Long-period fiber grating pulse shapers with reduced polarization dependence are fabricated and successfully used for polarization-independent 640-to-10 Gbit/s demultiplexing experiments
Presenza di Parapristina vertici/lata (Waterst.) e Odontofroggatia galili Wiebes (Hymenoptera: Chalcidoidea Agaonidae) in Sicilia
No full textTwo species of Agaonids: Parapristina verticillata (Waterst.) e Odontofroggatia galili Wiebes bave been found in Sicily living into receptacles of Ficus microcarpa L. (=benjamina auct.). The calcidoids are considered imported and acclimatated and will be added to the fig wasps fauna know from Europe
Reply to comments by E. Galili et al. on ‘‘Holocene tsunami’s from Mount Etna and the fate of Israeli Neolithic communities’’
No full textIn the early Holocene a devastating tsunami flooded
the coasts of the Eastern Mediterranean Sea [Pareschi et al.,
2006b, 2006c, 2007, 2008]. This tsunami was triggered by a
landslide from the eastern flanks of the Mt. Etna volcano
(Sicily, Italy). There is unquestionable evidence of the
inland-offshore tsunami-triggering landslide event: (1) the
Valle del Bove, a scar tens of square kilometres wide on
the volcano eastern slopes, (2) inland landslide deposits
(the Milo and Chiancone units, the latter protruding from
the previous coastline), and (3) offshore landslide deposits
[Pareschi et al., 2006a]. However, it is difficult to assess the
age of a landslide from its debris, because they are reworked
material. The inland Chiancone landslide deposit is covered
by debris and hyperconcentrated flow deposits emplaced
after the main volcano collapse; a sample from one of these
layers dates back to 7.59 ± .13 cal. kyr B.P. A reworked soil
material at the base of the Milo Unit is dated to 8.15–
8.38 cal. kyr B.P., whereas the youngest upper lithofacies of
this unit are dated to 5.3 cal. kyr B.P. [Calvari and
Groppelli, 1996; Calvari et al., 1998]. Overall, the ages
of the sporadic deeper inland landslide deposits on Mt. Etna
seem compatible with the abandonment of Atlit-Yam,
occurred around 8.3 cal. kyr. B.P [Galili et al., 2005], as
supported by the drastic decrease of later-dated findings.
Indeed, the few younger (plant) finds of the Israeli Neolithic
village [Galili et al., 2008] could be due to ‘‘bioturbation’’,
and in any case their age matches 8.3 cal. kyr. B.P. within a
2s 14C dating error
recensione a Ehud Galili (et al.), The Akko Marina Archaeological Project, BAR Int. Ser. 2862, Oxford 2017.
No full textIl libro scritto da Ehud Galili, prende il nome dall’omonimo sito neolitico, ubicato lungo la costa del Carmelo, si avvale della collaborazione di una serie di studiosi i quali analizzano in maniera approfondita reperti e tracce documentate durante le diverse ricognizioni costiere e subacquee previste nell’ambito del The Akko Marina Archaeological Project che è stato realizzato a partire dal 1988 fino al 2004 e con un’appendice che è stata realizzata nel 2014
All-optical OFDM demultiplexing by spectral magnification and optical band-pass filtering
No full textWe propose spectral magnification of optical-OFDM super-channels using time-lenses, enabling reduced inter-carrier-interference in subcarrier detection by simple band-pass filtering. A demonstration on an emulated 100 Gbit/s DPSK optical-OFDM channel shows improved sensitivities after 4-times spectral magnification.</p
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