87,157 research outputs found
Cardiac effects of formoterol and salmeterol in patients suffering from COPD with preexisting cardiac arrhythmias and hypoxemia
No full textDo tenure-based voting rights help mitigate the family firm control-growth dilemma?
No full textInvestment growth in family firms is constrained by family preferences to retain corporate control, which limits outside equity issuance and increases the expropriation risk perceived by external minority shareholders. Tenure-based voting rights (TVRs) weaken the link between voting rights and cash flow rights, facilitating new equity capital issuance without loss of control. We find that publicly listed family firms in Italy adopt TVRs to facilitate the continuation of investment growth while retaining family control. We also find that in family firms with fragile control, investment increases after TVR adoption. Our results indicate that control-enhancing mechanisms such as TVRs can help resolve the control–growth dilemma in family firms
Concorso Internazionale per la sistemazione di Piazza Augusto imperatore a Roma
No full textConcorso Internazionale per la sistemazione di Piazza Augusto imperatore a Rom
Il progetto ITANET a Campo Imperatore
No full textPrinted from: sirio.rm.astro.it (February 2005; web site of Campo Imperatore Observatory). - Report number from the web site. - On the title page: Nota tecnica Stazione Campo Imperatore 1 gennaio 1997Consiglio Nazionale delle Ricerche - Biblioteca Centrale - P.le Aldo Moro, 7 , Rome / CNR - Consiglio Nazionale delle RichercheSIGLEITItal
Abitare, spazio condiviso, progetto urbano. Il caso del complesso residenziale di Giustiniano Imperatore a Roma di ABDR Architetti associati
No full textThe paper proposes a reinterpretation of the residential and urban redevelopment case in viale Giustiniano Imperatore in Rome, which has proved successful even after its completion, becoming an exemplary case of public design of residences and urban spaces, as well as one of the first demolition and reconstruction projects undertaken in Italy. The initiative was undertaken by Department VI of the Municipality of Rome and the complex was designed by ABDR studio (M.L. Arlotti, M. Beccu, P. Desideri, F. Raimondo) based in Rome
Seismic retrofitting of masonry rocking elements with composite rebars
No full textVulnerability of unreinforced masonry structures, characterized by an out-of-plane behaviour, represents a worthy research topic, as highlighted by recent seismic events. Different retrofitting techniques, based on the introduction of proper restraints, can improve their seismic response. In this study, the more common technique, consisting in the application of vertical steel ties, is revised considering the usage of FRP rebars. The vertical restraints, placed in a centred position, are characterized by an elastic-brittle behaviour. In order to evaluate the effectiveness of the analysed retrofitting technique, the dynamic equation of motion of the anchored rigid rocking block is numerically solved. A parametric analysis is carried out for two rocking mechanisms (two-sided or one-sided), by varying geometry of masonry walls, characteristics of the seismic input and material of the vertical restraint. The obtained results show an improvement of the element seismic capacity, with an increase of the collapse acceleration, depending on the masonry block slenderness. Furthermore, the height of the block adversely affects the strengthening effectiveness. Consequently, the examined technique appears appropriate only in case of small values of the height of the masonry element
Groups Whose Proper Subgroups are Generalized -Groups
No full textLet be a class of groups. A group is
said to be \textit{minimal non-} if all proper
subgroups of are -groups but itself is not.
The aim of this article is to study the class of minimal
non--groups, where ( is a positive integer) is a
class of generalized FC-groups introduced in [F. de Giovanni, A.
Russo, G. Vincenzi, Groups with restricted conjugacy classes,
Serdica Math. J. 28 (2002) 241-254]
Therapy in elderly IBD patients
No full textIntroduction: Appropriate treatment is critical in elderly inflammatory bowel disease (IBD) subjects since they are at higher risk of complications such as infections, malignancies and mortality. Evidence acquisition: We conducted an extensive PUBMED search for guidelines, systematic reviews and primary studies to perform a critical analysis of the existing literature on the efficacy and safety of conventional and biological therapies for elderly IBD patients. Evidence synthesis: Due to the exclusion of elderly population from clinical trials, most evidences comes from real-life studies. While aminosalicylates remain a cornerstone treatment of elderly patients with ulcerative colitis (UC), for their effectiveness and safety, their use in Crohn's disease (CD) should not be further supported. Corticosteroid use should be limited for the induction of remission, while as maintenance treatment it should be avoided, due to the low safety profile. Although as efficacious as in the younger population, immunosuppressant use has been associated with higher risk of infective/malignant issues and further use should be carefully evaluated. Biologics have demonstrated high effectiveness in the elderly. However, due to increased morbidity and mortality described in elderly subjects treated with anti-TNF alpha agents, vedolizumab and ustekinumab should be favoured over anti-TNF alpha agents. Conclusions: Treatment of elderly IBD patients remains challenging, since comorbidities and the risk of adverse events can complicate the effectiveness and safety of therapy. Close monitoring of such patients in a multidisciplinary team is advocated to reduce the risk of infections and optimize the treatment, choosing a suitable agent
PERTURBATION THEORY FOR ELECTROMAGNETIC WAVE SCATTERING IN RANDOM LAYERED STRUCTURES
No full textThe problem of electromagnetic wave scattering in 3-D random layered structures, is analytical treated by relying on original results of the Boundary Perturbation Theory (BPT) and Volumetric-Perturbative Reciprocal Theory (VPRT), whose structured presentation of the pertinent theoretical body of innovative results is proposed and developed in this thesis.
The systematic formulation of Boundary Perturbation Theory (BPT) is here introduced to deal with the analysis of a layered structure with an arbitrary number of gently rough interfaces: in this case the proposed theoretical construct is based on a suitable perturbation pertinent to the geometry of the problem and the scattering problem is treated by adopting a proper perturbation of boundary conditions. Specifically, it is demonstrated that, in the first-order approximation, BPT leads to fully polarimetric, formally symmetric and physical revealing closed form solution: the relevant innovative scattering models obtained in this perturbation framework permit to deal with bistatic scattering, from and through three-dimensional layered structures with an arbitrary number of gently rough interfaces.
Furthermore, Volumetric-Perturbative Reciprocal Theory (VPRT) is also formulated in this thesis. VPRT methodologically adopts a different approach, which is based on two key elements: the use of the Reciprocity Theorem and an appropriate description of the scattering structure in terms of space-variant volumetric perturbation of the dielectric constant distribution. The VPRT construct also provides meaningful reaction-based expressions for the scattering field, which are straightforward and rich in descriptive power.
It is important to emphasize that VPRT, which is methodologically conceived to consistently treat both interfacial and volumetric random inhomogeneities (so providing a unified mathematical formulation and conceptual understanding of two inherent scattering mechanisms), is also fully consistent with the results of BPT. Accordingly, within VPRT framework, both rough-interface and volume scattering are take into account methodologically.
Furthermore, within this new theoretical framework, a new look at the classical SPM solution for rough surface is also offered: even such a specific solution (whose derivation hitherto obtained via unnecessary, involved and obscure algebraic manipulations) is derived a surprisingly simple way, clarifying all the same the lacking inherent physical meaning.
Beyond a certain compactness of the pertinent closed-form solutions, the fundamental scattering interactions can be revealed, gaining a coherent explanation and a neat picture of the physical meaning of the proposed theoretical constructs. In fact, it is important to note that a deep comprehension of the physical phenomena involved in the electromagnetic wave scattering interaction with such kind of complex structures would have been a rather hopeless task before the introduction of these theories.
Finally, it is noteworthy that this theoretical body of results enables a new way to systematically construct meaningful and general expressions for the scattering field pertinent to wide class of scattering configurations, involving complex structures that can be arranged in a perturbation framework, and it is successful in that it exhibit: conceptual clearness, descriptive power and general applicability to random layered structures
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