1,343 research outputs found
The Fed and the Stock Market
The Fed closely monitors the stock market and the stock market continuously forms expectations about the Fed decisions. What does this imply for the relation between the fed funds rate and the S&P500? We find that the answer depends on the conditions prevailing on the financial market. During periods of high (low) volatility in asset price inflation an unexpected 5 fall in the stock market index implies that the Fed cuts the interest rate by 19 () basis points while an unanticipated policy tightening of 50 basis points causes a 4.7 (2.3) decline in the S&P500. The Fed reaction to asset price return is however statistically different from zero only in the high volatility regime, whereas the fall in asset price return following an interest rate rise is highly significant during normal times onlyasset price volatility, nonlinear policy, threshold SVAR, system GMM.
Organization and structure of the chain in the Integrated Projects of Food Chain in Basilicata region: the effects on the new rural dynamics
The introduction of the Integrated Projects of Food Chain requires the development of models capable of interpreting the dynamics of vertical and horizontal coordination between agents and the definition of the issues that most affect the ability of professionals to provide value added to goods and products to acquire in exchange a competitive advantage. With reference to the Basilicata region, the production structure of the region and the recent development of the Integrated Projects of Food Chain, this research has developed a new model of territorial organization of rural development. Now connect a new food chain model that combines theories of productivity, typical of contract economic, with those of social welfare and environmental economics: multifunctionality and biodiversity related to the needs of income and efficiency of companies in various stages of the food chain classic, in a context in which planning consultation is major determinant of local and regional development.Food Chain, Rural Development, Integrated Project of Food Chain., Agribusiness, Agricultural and Food Policy, Community/Rural/Urban Development, Food Consumption/Nutrition/Food Safety, Labor and Human Capital,
Rural development in the area of Pollino: integrated design of an “atypical” chain
The introduction of the Integrated Projects of Food Chain requires the development of models capable of interpreting the dynamics of vertical and horizontal coordination between agents and the definition of the issues that most affect the ability of professionals to provide value added to goods and products to acquire in exchange a competitive advantage. With reference to setting up Local Production System of the Pollino - Lagonegrese, characterized by the development of an "atypical" food chain, for which the main factor of integration and competitive advantage lies in the strong link between companies and territory and in the social and economic value of the protected area agriculture, this research has developed a new model for food chain that combines theories of productivity with those of social welfare and environmental economics: multifunctionality and biodiversity related to the needs of income and efficiency of companies in various stages of the food chain classic.Food Chain, Protected areas, Rural Development, Integrated Project of Food Chain, Local Production System Pollino-Lagonegrese, Community/Rural/Urban Development,
Gamma ray tests of Minimal Dark Matter
We reconsider the model of Minimal Dark Matter (a fermionic, hypercharge-less
quintuplet of the EW interactions) and compute its gamma ray signatures. We
compare them with a number of gamma ray probes: the galactic halo diffuse
measurements, the galactic center line searches and recent dwarf galaxies
observations. We find that the original minimal model, whose mass is fixed at
9.4 TeV by the relic abundance requirement, is constrained by the line searches
from the Galactic Center: it is ruled out if the Milky Way possesses a cuspy
profile such as NFW but it is still allowed if it has a cored one. Observations
of dwarf spheroidal galaxies are also relevant (in particular searches for
lines), and ongoing astrophysical progresses on these systems have the
potential to eventually rule out the model. We also explore a wider mass range,
which applies to the case in which the relic abundance requirement is relaxed.
Most of our results can be safely extended to the larger class of multi-TeV
WIMP DM annihilating into massive gauge bosons.Comment: 25 pages, 8 figures. v2: a few comments and references added, matches
version published on JCA
Weak Corrections are Relevant for Dark Matter Indirect Detection
The computation of the energy spectra of Standard Model particles originated
from the annihilation/decay of dark matter particles is of primary importance
in indirect searches of dark matter. We compute how the inclusion of
electroweak corrections significantly alter such spectra when the mass M of
dark matter particles is larger than the electroweak scale: soft electroweak
gauge bosons are copiously radiated opening new channels in the final states
which otherwise would be forbidden if such corrections are neglected. All
stable particles are therefore present in the final spectrum, independently of
the primary channel of dark matter annihilation/decay. Such corrections are
model independent.Comment: 38 pages (half are technical appendices), 7 figure
Asymmetric dark matter: residual annihilations and self-interactions
Dark matter (DM) coupled to light mediators has been invoked to resolve the
putative discrepancies between collisionless cold DM and galactic structure
observations. However, -ray searches and the CMB strongly constrain
such scenarios. To ease the tension, we consider asymmetric DM. We show that,
contrary to the common lore, detectable annihilations occur even for large
asymmetries, and derive bounds from the CMB, -ray, neutrino and
antiproton searches. We then identify the viable space for self-interacting DM.
Direct detection does not exclude this scenario, but provides a way to test it.Comment: 20 pages, 4 figure
Optical spectra of solids obtained by time-dependent density-functional theory with the jellium-with-gap model exchange-correlation kernel
Within the framework of ab initio time-dependent density-functional theory
(TD-DFT), we propose a static approximation to the exchange-correlation kernel
based on the jellium-with-gap model. This kernel accounts for electron-hole
interactions and it is able to address both strongly bound excitons and weak
excitonic effects. TD-DFT absorption spectra of several bulk materials (both
semiconductor and insulators) are reproduced in very good agreement with the
experiments and with a low computational cost.Comment: 5 pages, 3 figures, 1 tabl
Aggiornamento delle conoscenze relative alla fauna ittica del Lago di Mergozzo (VB) con brevi note gestionali
No abstract availableLa presente relazione si propone di analizzare sinteticamente lo stato della fauna ittica del Lago di Mergozzo (VB), ed evidenziarne le peculiarit? e criticit? confrontando i dati attuali con quelli relativi ad indagini dettagliate effettuate in passato (Giussani 1994). Il campionamento dell\u27ittiofauna del Lago di Mergozzo rientra nelle attivit? incluse in due progetti di ricerca e gestione delle risorse idriche finanziati dalla Comunit? Europea: il progetto WISER (www.wiser.eu) e il progetto LIFE + Inhabit (www.life-inhabit.it), entrambi focalizzati alla implementazione della Direttiva Europea sulle Acque (2000/60/CE). Tali progetti, finalizzati all\u27utilizzo di indicatori biologici per valutare lo stato ecologico degli ecosistemi acquatici, vedono l\u27impegno comune di realt? come ARPA Piemonte e numerosi e qualificati Istituti di Ricerca Italiani ed Esteri, tra cui il CNR-ISE. Al di l? dell\u27impegno istituzionale legato a progetti di ricerca su larga scala, il CNR-ISE si propone di redigere la presente relazione anche con lo scopo di fornire agli attori locali (Comune di Mergozzo, Associazione Pescatori del Lago di Mergozzo e, in secondo luogo, Provincia del VCO) informazioni utili alla conoscenza e gestione dell\u27ittiofauna di questo lago
Synthesis and properties of new macrocyclic derivates
2017 - 2018This PhD thesis is concerned with the design, synthesis and the characterization of new macrocyclic
derivatives. Development of new macrocyclic compounds is a particularly interesting because they
can involve like building block in Supramolecular chemistry and Nanochemistry.
In the first place, I studied the supramolecular properties of different derivatives of the
resorcin[6]arenes.
Crystal of Resorcin[6]arene was obtained and it reveals that in the solid state the resorcin[6]arene
assembles in a twin molecular capsule able to host toluene and ethyl acetate solvent molecules.
Subsequently, I have reported the first example of resorcin[6]arene-based cavitand. Sulfate bridges
play a double role, both, as structural element for the preorganization of the larger resorcin[6]arene
macrocycle and as functional supramolecular interacting groups.
Finally, I develop a new multivalent systems resorcin[n]arene based for inhibition of glycosidases
and mannosidase that are involved in the malignant transformation of cells. These derivatives were
synthetized starting to a pyrrolidine-based iminosugar and resorcinarenes compounds through
CuAAS cycloaddition. Biological essays showed that all the resorcinarene derivatives have a good
inhibitory activity towards mannosidase enzymes.
In second instance, I synthetized new Cycloparaphenylenes (CPP) derivatives to molecular
recognition and optoelectronic application.
Particularly about molecular recognition field, I reported the synthesis of a [8]CPP derivative
incorporating an electron-rich 1,4-dimethoxybenzene ring. This is the first example of substituted
CPP derivative reported in literature able to recognize pyridinium guests. Owing to the presence of
the 1,4-dimethoxybenzene ring a fine-tuning of the binding abilities toward pyridinium guests was
obtained with respect to the native [8]CPP macrocycle.
Hybrid Calixarene-CPP derivative that combine the supramolecular features of both the hosts was
synthetized and studied in molecular recognition of Na+, Li+ and K+. This derivative shows a noncommon
Li+ selectivity due to a more favorable interaction between the cation and the aromatic rings
of the CPP bridge.
Synthesis of incorporate the 9,10-diphenyl anthracene - [8]CPP derivative was performed and were
studied optical and electronical features to obtain the first example of a CPP-based emitter in photon
upconversion in the presence of the of octaethylporphyrin Pd(II) complex as a sensitizer, thus
widening the application fields of this class of compounds.
Finally, [8]CPP and [10]CPP was tested to produce Luminescent Solar Concentrators (LSCs). The
high Stokes shift of the CPP macrocycles, enables the preparation of slabs in which a low reabsorption
was observed. The results here obtained show clearly the photophysical performances of the CPPbased
LSC closely matches with that of the lanthanide chelates based LSC, of interest for applications
in colorless LSC. [edited by Author]XXXI cicl
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