102,562 research outputs found
Vulnus Vb 4.0: Procedura automatica per analisi di vulnerabilità sismica di edifici in muratura
No full textAggiornamento ed estensione in Visual basic della procedura VULNUS, di Bernardini-Gori-Modena, 1988. A cura di M.R. Valluzzi, con contributi di Benincà G., Barbetta E., Munari M
Amore e coscienza di sé. Una lettura del testo di J.G.Herder
No full textNel 1781 Johann Gottfried Herder pubblicò un breve saggio intitolato Liebe und Selbstheit [Amore e coscienza di sé], presentandolo come una postilla alla Lettre sur les désirs [Lettera sui desideri] che Frans Hemsterhuis aveva scritto nel 1768. Il commento di Herder fu ritenuto così autorevole da essere inserito nella prima edizione della raccolta di opere di Hemsterhuis, pubblicata nel 1872 in lingua tedesca, e poi nelle successive edizioni in francese.
Herder era fortemente attratto dal pensiero e dal metodo del tutto asistematico di Frans Hemsterhuis, che riconosce esplicitamente Socrate come propria guida e pone come unica strada percorribile la ricerca della verità, mediante l’apporto della coscienza e del sentimento di ogni essere umano che non si sazia di tendere alla visione del bene in sé, della bellezza in sé, al di là della molteplice manifestazione fenomenica.
Il contributo di Maria Cecilia Barbetta presenta dapprima il contenuto della Lettera sui desideri di Hemsterhuis, in relazione al Simposio di Platone, per poi leggere interamente il saggio di Herder, mai tradotto in italiano. Il breve saggio Liebe und Selbstheit è una sorta di inno all’amore in tutti i suoi aspetti, scritto in una forma poetica che avvince con crescente ispirazione di toni e che contiene spesso riferimenti, dichiarati o nascosti, ad autori greci e latini, alla Bibbia ed all’antica sapienza orientale.
Lo studio mette in evidenza, con riscontro puntuale di citazioni, come il saggio herderiano, che pare inizialmente muoversi nell’ambito prospettato dal filosofo olandese Hemsterhuis, lasci ben presto emergere l’interesse precipuo di Herder in questi anni: quella lettura ed integrazione di temi, propri di Spinoza, di Shaftesbury e di Leibniz, che Herder rielabora e fa propri con dichiarazione esplicita nel più tardo Gott. Einige Gesprache [Dio. Alcuni dialoghi], del 1787, e ancor più nella seconda edizione, del 1800, ampliata anche nel titolo con il riferimento a Spinoza, che termina con Naturhymnus [Inno alla natura]: una libera trasposizione in versi di una parte dei Moralists di Shaftesbury
Social network a scuola? Per Pirandello non servono
No full textIl contributo analizza l'effetto dell'utilizzo dei social network per migliorare l'apprendimento della letteratura da parte di studenti della scuola superior
Gli effetti del programma AttivAree: prime stime
No full textWe analyse the impact of a program aimed at revitalziing internal and neglected areas in Northern Ital
Good or Bad? Short- versus Long-Term Effects of Multigrading on Child Achievement
No full textThis paper studies the effect of multigrading—mixing children of different
ages in the same classroom—on students’ short- versus long-term academic
achievement in Italy. We cope with the endogeneity of multigrading (and
class size) through an instrumental variable identification strategy based on
a law that disciplines class composition. By relying on longitudinal data that
follow a cohort of Italian students over their compulsory school career, we
show that multigrading has a positive short-term effect on achievements.
This effect fades away over time to become negative in the long run if students
spend several years in a multigrade class. The analysis of mechanisms
points to the fundamental role of teachers and suggests that no negative
long-term effect arises when multigrade classes are taught by more experienced
and motivated teachers. These results reconcile contrasting findings
in the literature based on cross-sectional data and a short-term focus
Behavioral differences between public and private not-for-profit hospitals in the Italian national health service
No full textIn this paper we attempt to identify behavioral differences between public and private not-for-profit hospitals, by exploiting the introduction of the DRG-based payment system in the Italian NHS during the second half of the 1990s. We estimate the technical efficiency of a sample of hospitals for the period 1995-2000 considering an output distance function, and adopting both parametric (COLS and SF) and nonparametric (DEA) approaches. Our results show a convergence of mean efficiency scores between not-for-profit and public hospitals, and seem to suggest that differences in economic performances between competing ownership forms are more the result of the institutional settings in which they operate than the effect of the incentive structures embedded in the different proprietary forms. We also observe a decline in technical efficiency, probably due to policies aimed at reducing hospitalization rates. Copyright © 2006 John Wiley & Sons, Ltd.
Good or bad? Understanding the effects over time of multigrading on child achievement
No full textMultigrading represents the practice of mixing children of different ages in the same classroom. This paper examines the effect of attending a multigrade class in Grade 2 on students' academic achievement in Grades 2, 5, and 8, respectively, considering Italy as a case study. To address the issue of endogeneity of multigrading (and class size), we adopt an IV identification strategy based on a law that disciplines class composition. We show that multigrading has a positive (16 percent of a standard deviation) short-term effect on academic achievements. However, this effect diminishes over time and becomes negative (-10 percent of a standard deviation) if students spend several years in a multigrade class. Mechanism analysis indicates the fundamental role of teachers and suggests that the negative long-term effect of multigrading is not statistically different from zero when multigrade classes are taught by more experienced teachers. These findings, based on longitudinal data, reconcile contrasting results in the literature, which are based on cross-sectional data and on the short-term effects of multigrading
Multigrade and Child Achievement
No full textWe study how multigrading, which is mixing students of different grades into a single class, affects children’s cognitive achievement in primary school. We build instruments to identify the causal effect of multigrading by exploiting an Italian law that controls class size and grade composition. Results suggest that attendance in multigrade versus single-grade classes increases students’ performance on standardized tests by 19 percent of a standard deviation for second graders, and it has zero effect for fifth graders. The positive impact of multigrading for second graders appears to be driven by children sharing their class with peers from higher grades. This last finding rationalizes the absence of a multigrade effect for fifth graders
Acid gel formation in (pseudo) alginates with and without G blocks produced by epimerising mannuronan with C5 epimerases
No full textThe main scope of this paper is the characterization, in terms of viscoelastic and mechanical properties, of acid gels formed from solutions of mannuronan ALG (0%G/0%GG) and its enzymatically epimerised products. The epimerised products were obtained using recombinantly produced mannuronan C5 epimerases named AlgE1 and AlgE4, which catalyse the conversion of mannuronic residues into guluronic (G) and guluronic-mannuronic (GM) blocks, respectively. The products used in this study resulted from either the action of AlgE1 on mannuronan for 5 and 24 h (named ALG(44%G/32%GG) and ALG (68%G/59%GG), respectively) or AlgE4 on mannuronan (named ALG (47%G/0%GG)). d-gluconic acid-δ-lactone (GDL) was used as H+-donor to produce acidic gels. ALG (0%G/0%GG) yields strong, stable solid-like structures. As predicted by circular dichroism measurements performed at different pH, gelation of ALG (47%G/0%GG) occurs at lower values of pH (∼1) than those obtainable using GDL. Hydrochloric acid was therefore added to ALG (47%G/0%GG) solutions yielding rapid sol-gel transitions and gels with a remarkable resistance to thermal treatment. The introduction of guluronic residues along the chain (ALG (44%G/32%GG)) causes a reduction in the storage modulus at the equilibrium with respect to that of ALG (0%G/0%GG) and the occurrence of negligible syneresis at the highest polymer concentrations. The increase in the average length of the G blocks (ALG (68%G/59%GG)) is accompanied by a further increase in the storage modulus without the occurrence of any significant syneresis. © 2006 Elsevier Ltd. All rights reserved.The main scope of this paper is the characterization, in terms of viscoelastic and mechanical properties, of acid gels formed from solutions of
mannuronan ALG (0%G/0%GG) and its enzymatically epimerised products. The epimerised products were obtained using recombinantly
produced mannuronan C5 epimerases named AlgE1 and AlgE4, which catalyse the conversion of mannuronic residues into guluronic (G) and
guluronic–mannuronic (GM) blocks, respectively. The products used in this study resulted from either the action of AlgE1 on mannuronan for 5
and 24 h (named ALG(44%G/32%GG) and ALG (68%G/59%GG), respectively) or AlgE4 on mannuronan (named ALG (47%G/0%GG)). Dgluconic
acid-d-lactone (GDL) was used as HC-donor to produce acidic gels. ALG (0%G/0%GG) yields strong, stable solid-like structures. As
predicted by circular dichroism measurements performed at different pH, gelation of ALG (47%G/0%GG) occurs at lower values of pH (w1) than
those obtainable using GDL. Hydrochloric acid was therefore added to ALG (47%G/0%GG) solutions yielding rapid sol–gel transitions and gels
with a remarkable resistance to thermal treatment.
The introduction of guluronic residues along the chain (ALG (44%G/32%GG)) causes a reduction in the storage modulus at the equilibrium
with respect to that of ALG (0%G/0%GG) and the occurrence of negligible syneresis at the highest polymer concentrations. The increase in the
average length of the G blocks (ALG (68%G/59%GG)) is accompanied by a further increase in the storage modulus without the occurrence of any
significant syneresis
Sono utili gli interventi sociali?
No full textL'articolo discute l'utilizzo di metodologie controfattuali per la valutazione di interventi in campo sociale
- …
