4,174 research outputs found
Structuring portfolio selection criteria for interactive decision support
A trichotomic evaluation system for portfolio selection support is proposed
through this paper. The methodology works in two phases: First, Arbitrage
Pricing Theory (APT) is used to estimate portfoliosâ expected return and to
identify influence factors and risk origins. ELECTRE TRI method aggregates
all the common risk criteria into a unique one, which is more understandable
by real investors or portfolio managers. By this way each alternative portfolio
is evaluated on three criteria only including return, residual risk and common
risk. In the second phase, the MINORA multicriteria interactive system based
on preference disaggregation is proposed to select attractive portfolios. The
whole methodological framework is illustrated by an application to the French
stock market.peer-reviewe
Adnexal Torsion during Pregnancy after Oocyte In Vitro Maturation and Intracytoplasmic Sperm Injection Cycle
We report a case of right adnexal torsion during pregnancy after an oocyte in vitro maturation and intracitoplasmic sperm injection cycle in patient with polycystic ovary syndrome. A 31-year-old woman with a typical clinical disorder of polycystic ovarian syndrome was included in an oocyte in vitro maturation program. Right adnexal torsion occurred two days after embryo transfer, and laparoscopy detorsion was successfully performed with preservation of adnexa. The patient had a full-term pregnancy and delivered a healthy infant at 40 weeks of gestation. To our knowledge this is the first report of adnexal torsion after an oocyte in vitro maturation and intracitoplasmic sperm injection program
Studies of Vertex Tracking with SOI Pixel Sensors for Future Lepton Colliders
This paper presents a study of vertex tracking with a beam hodoscope
consisting of three layers of monolithic pixel sensors in SOI technology on
high-resistivity substrate. We study the track extrapolation accuracy,
two-track separation and vertex reconstruction accuracy in pion-Cu interactions
with 150 and 300 GeV/c pions at the CERN SPS. Results are discussed in the
context of vertex tracking at future lepton colliders.Comment: 15 pages, 8 figures, submitted to Nuclear Instruments and Methods
Kristopher F. B. Fletcher et Osman Umurhan (éds.), Classical Antiquity in Heavy Metal Music
NellâIntroduzione di questo volume collettivo intitolata âWhere Metal and Classics Meetâ, gli editori, Fletcher et Umurhan, fanno partire la loro analisi da unâinteressante riflessione: questo libro Ăš stato concepito non tanto per lâincredibile quantitĂ di brani e album di musica metal facenti riferimento o basati sullâantichitĂ classica. Piuttosto li ha colpito come ci sono pochi corsi di storia antica che non sarebbero degnamente accompagnati da una lunga e ricca playlist di brani metal isp..
l W nu production at CLIC: a window to TeV scale non-decoupled neutrinos
We discuss single heavy neutrino production e+ e- -> N nu -> l W nu, l = e,
mu, tau, at a future high energy collider like CLIC, with a centre of mass
energy of 3 TeV. This process could allow to detect heavy neutrinos with masses
of 1-2 TeV if their coupling to the electron V_eN is in the range 0.004-0.01.
We study the dependence of the limits on the heavy neutrino mass and emphasise
the crucial role of lepton flavour in the discovery of a positive signal at
CLIC energy. We present strategies to determine heavy neutrino properties once
they are discovered, namely their Dirac or Majorana character and the size and
chirality of their charged current couplings. Conversely, if no signal is
found, the bound V_eN < 0.002-0.006 would be set for masses of 1-2 TeV,
improving the present limit up to a factor of 30. We also extend previous work
examining in detail the flavour and mass dependence of the corresponding limits
at ILC, as well as the determination of heavy neutrino properties if they are
discovered at this collider.Comment: LaTeX 32 pages. Added comments and references. Matches version to
appear in JHE
Modulation of gonadotrophin induced steroidogenic enzymes in granulosa cells by d-chiroinositol
d-chiroinositol (DCI) is a inositolphosphoglycan (IPG) involved in several cellular functions that control the glucose metabolism. DCI functions as second messenger in the insulin signaling pathway and it is considered an insulin sensitizer since deficiency in tissue availability of DCI were shown to cause insulin resistance (IR). Polycystic ovary syndrome (PCOS) is a pathological condition that is often accompanied with insulin resistance. DCI can positively affects several aspect of PCOS etiology decreasing the total and free testosterone, lowering blood pressure, improving the glucose metabolism and increasing the ovulation frequency. The purpose of this study was to evaluate the effects of DCI and insulin combined with gonadotrophins namely follicle-stimulating hormone (FSH) and luteinizing hormone (LH) on key steroidogenic enzymes genes regulation, cytochrome P450 family 19 subfamily A member 1 (CYP19A1) and cytochrome P450 side-chain cleavage (P450scc) in primary cultures of human granulosa cells (hGCs). We also investigated whether DCI, being an insulin-sensitizer would be able to counteract the expected stimulator activity of insulin on human granulosa cells (hGCs)
Phenomenology of the nMSSM from colliders to cosmology
Low energy supersymmetric models provide a solution to the hierarchy problem
and also have the necessary ingredients to solve two of the most outstanding
issues in cosmology: the origin of dark matter and baryonic matter. One of the
most attractive features of this framework is that the relevant physical
processes are related to interactions at the weak scale and therefore may be
tested in collider experiments in the near future. This is true for the Minimal
Supersymmetric Standard Model (MSSM) as well as for its extension with the
addition of one singlet chiral superfield, the so-called nMSSM. It has been
recently shown that within the nMSSM an elegant solution to both the problem of
baryogenesis and dark matter may be found, that relies mostly on the mixing of
the singlet sector with the Higgs sector of the theory. In this work we review
the nMSSM model constraints from cosmology and present the associated collider
phenomenology at the LHC and the ILC. We show that the ILC will efficiently
probe the neutralino, chargino and Higgs sectors, allowing to confront
cosmological observations with computations based on collider measurements. We
also investigate the prospects for a direct detection of dark matter and the
constraints imposed by the current bounds of the electron electric dipole
moment in this model.Comment: 44 pp, 10 figures; Fig.9 replaced; discussion on CP violation
extended and references added; few minor additions in text about details of
the cut
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