24 research outputs found
Optimal Switch Placement by Alliance Algorithm for Improving Microgrids Reliability
No full textA method for optimal switches placement in distribution systems with distributed generation is presented in this paper. According to both technical and economical issues, the method allows minimizing the unsupplied loads in case of permanent faults, while limiting the number of installed switches. The problem is formulated as a mixed integer non linear programming problem (MINLP) and the solution is obtained by a new metaheuristic algorithm, i.e., the Alliance Algorithm. The method is based on self-microgrids forming and allows improving the continuity of the service as confirmed by simulation results on both an IEEE standard and a real test network
Recenti tendenze delle dinamiche insediative in Toscana. La rinuncia a costruire
No full textIl contributo costituisce il report di un’accurata indagine sulle più recenti tendenze in atto nel quadro complessivo delle dinamiche insediative, utilizzando come indicatore e strumento di analisi le variazioni del valore economico dei suoli edificabili e con particolare riferimento alla situazione in Toscana.
È nei meccanismi di produzione della rendita, ed in particolare nell’andamento delle variabili che concorrono alla sua determinazione, che si individua la chiave per interpretare i fenomeni che appaiono emergere e delineare i temi da questi imposti al dibattito urbanistico ed al quadro normativo preordinato al processo di pianificazione
Turin Shroud-like Electric Imaging Connected to Earthquakes
No full textA large amount of long lasting experiments, carried out by the first author with
the supervision of coauthoring experts in electrical imaging and Turin Shroud (TS) studies,
was addressed to obtain TS-like impressions. To this end, the experiments was especially
performed by using conducting objects previously enveloped in two-folded cloths, then
inserted into a gap bounded by a pair of rocky plates. The prerequisite for image formation
seems to be an especially abundant emission of radon, related to earthquakes, ultimately
giving rise to a macro-scale background electric field of the order of 1 kV/m in the gap and,
more importantly, to micro-scale field amplification. This additional field is localized in the
air filled interstices of the exposed fabric, thus causing consequent aging. In spite of the
complicate and unpredictable character of the natural phenomenology under examination,
the investigators succeeded in categorizing different kinds of impressions and selecting one
of them as being thoroughly successful. Specifically, the images of the selected category do
exhibit basic physicochemical and optical features distinctive of the figure impressed on the
Turin Shrou
The renal arterial resistance index predicts worsening renal function in chronic heart failure patients
No full textLogo Cardiorenal Medicine
Original Paper
The Renal Arterial Resistance Index Predicts Worsening Renal Function in Chronic Heart Failure Patients
Iacoviello M.a · Monitillo F.b · Leone M.b · Citarelli G.b · Doronzo A.c · Antoncecchi V.c · Puzzovivo A.c · Rizzo C.b · Lattarulo M.S.b · Massari F.c · Caldarola P.c · Ciccone M.M.b
Author affiliations
Keywords: Chronic kidney diseaseSystemic disease and the kidneyGlomerular hemodynamics
Cardiorenal Med 2017;7:42-49
https://doi.org/10.1159/000448405
Abstract
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Abstract
Background/Aim: The renal arterial resistance index (RRI) is a Doppler measure, which reflects abnormalities in the renal blood flow. The aim of this study was to verify the value of RRI as a predictor of worsening renal function (WRF) in a group of chronic heart failure (CHF) outpatients. Methods: We enrolled 266 patients in stable clinical conditions and on conventional therapy. Peak systolic velocity and end diastolic velocity of a segmental renal artery were obtained by pulsed Doppler flow, and RRI was calculated. Creatinine serum levels were evaluated at baseline and at 1 year, and the changes were used to assess WRF occurrence. Results: During follow-up, 34 (13%) patients showed WRF. RRI was associated with WRF at univariate (OR: 1.13; 95% CI: 1.07-1.20) as well as at a forward stepwise multivariate logistic regression analysis (OR: 1.09; 95% CI: 1.03-1.16; p = 0.005) including the other univariate predictors. Conclusions: Quantification of arterial renal perfusion provides a new parameter that independently predicts the WRF in CHF outpatients. Its possible role in current clinical practice to better define the risk of cardiorenal syndrome progression is strengthened
