A high resolution scheme for flows in open channels with arbitrary cross-section

The aim of this paper is to present a numerical scheme to simulate unsteady, one dimensional flows in open channels with arbitrary cross-section. This scheme is fully conservative of volume and momentum and preserves the non-negativity of the water depth. The finite difference method derived is semi-implicit in time and based on a space staggered grid. A high resolution technique, the flux limiter method, is implemented to control the accuracy of the proposed scheme. Our purpose is to achieve the precision and the stability of the method with respect to the regularity of the data. A few computational examples on classical test cases are given to illustrate the properties of the present method in terms of stability, accuracy and efficiency

A robust scheme for free surface and pressurized flows in channels with arbitrary cross-sections

Flows in closed channels, such as rain storm sewers, often contain transitions from free surface flows to pressurized flows, or viceversa. These phenomena usually require two different sets of equations to model the two different flow regimes. Actually, a few specifications for the geometry of the channel and for the discretization choices can be sufficient to model closed channel flows using only the open channel flow equations. Transitions can also occur in open channels, like those from super- to subcritical flow, or vice versa. These particular flows are usually difficult to reproduce numerically and strong restrictions are imposed on the numerical scheme to simulate them. In this paper, an implicit finite-difference conservative algorithm is proposed to deal properly with these problems. In addition, a special flux limiter is described and implemented to allow accurate flow simulations near hydraulic structures such as weirs. A few computational examples are given to illustrate the properties of the scheme and the numerical solutions are compared with experimental data, when possible

Estimate of seismic surface energy from microstructural studies of pseudotachylyte-bearing faults

openThe total energy budget of an earthquake is one of the great unknowns in geology. From geological, seismological and laboratory evidences it is clear that the total energy of a seismic event is converted into seismic waves together with dissipation processes such as heat, fracture and friction. One of the sinks of seismic energy is the fracture energy required to propagate the fault surface and produce the surrounding damage zone. This thesis aims at estimating this parameter through the analysis of microfracture patterns found in the wall rock of a pseudotachylyte-bearing fault of the Gole Larghe Fault Zone (Adamello massif, Italy). Knowing the magnitude of the surface fracture energy it will be possible to make some considerations on the total energy of a seismic event. Understanding its partitioning is fundamental to also understand the mechanics of earthquakes.The total energy budget of an earthquake is one of the great unknowns in geology. From geological, seismological and laboratory evidences it is clear that the total energy of a seismic event is converted into seismic waves together with dissipation processes such as heat, fracture and friction. One of the sinks of seismic energy is the fracture energy required to propagate the fault surface and produce the surrounding damage zone. This thesis aims at estimating this parameter through the analysis of microfracture patterns found in the wall rock of a pseudotachylyte-bearing fault of the Gole Larghe Fault Zone (Adamello massif, Italy). Knowing the magnitude of the surface fracture energy it will be possible to make some considerations on the total energy of a seismic event. Understanding its partitioning is fundamental to also understand the mechanics of earthquakes

LO STEMMA DELLA CITTÀ DI ROVIGNO

L\u27autore, dopo aver descritto l\u27evoluzione dell\u27araldica civica europea, analizza le insegne della città di Rovigno. L\u27autore conclude affermando che il vero stemma della città di Rovigno porta per blasonatura: "D\u27argento alla croce di rosso". Per gli ornamenti esteriori prevede quelli di città, ipotizzando, però, anche la possibilità che lo scudo appaia timbrato dalla corona marchionale.Nakon sto je autor opisao razvoj europske gradanske heraldike, s posebnim osvrtom na talijansku, ovim ogledom, uz pomoé dragocjene studije Marina Budicina o rovinjskom grbu, analizira razna znamenja grada Rovinja, od nara do crvenog kriza u srebrnom polju. Posebnu pozornost obraéa rovinjskom crvenom krizu, ciji je okomiti krak, od pocetnog ravnog oblika, s vremenom dobio iskrivljeni oblik poput vodoravnog stvarajuéi opticki dojam zaobljenog stita. Ogled analizira takoder rovinjski stijeg, zastavu i zig; za potonje opisuje i konvencionalne znakove gleda, upravo da bi se znamenje mogio razlikovati kad nije prikazan u boji. Autor zavrsava rad sa prijedlogom blazoniranja grba grada Rovinja: "u srebrnom crveni kriz". Za vanjske ukrase predvida one gradske, pretpostavljajuéi medutim i moguénost da stit nosi krunu markiza

LO STEMMA DELLA CITTÀ DI ROVIGNO

L\u27autore, dopo aver descritto l\u27evoluzione dell\u27araldica civica europea, analizza le insegne della città di Rovigno. L\u27autore conclude affermando che il vero stemma della città di Rovigno porta per blasonatura: "D\u27argento alla croce di rosso". Per gli ornamenti esteriori prevede quelli di città, ipotizzando, però, anche la possibilità che lo scudo appaia timbrato dalla corona marchionale.Nakon sto je autor opisao razvoj europske gradanske heraldike, s posebnim osvrtom na talijansku, ovim ogledom, uz pomoé dragocjene studije Marina Budicina o rovinjskom grbu, analizira razna znamenja grada Rovinja, od nara do crvenog kriza u srebrnom polju. Posebnu pozornost obraéa rovinjskom crvenom krizu, ciji je okomiti krak, od pocetnog ravnog oblika, s vremenom dobio iskrivljeni oblik poput vodoravnog stvarajuéi opticki dojam zaobljenog stita. Ogled analizira takoder rovinjski stijeg, zastavu i zig; za potonje opisuje i konvencionalne znakove gleda, upravo da bi se znamenje mogio razlikovati kad nije prikazan u boji. Autor zavrsava rad sa prijedlogom blazoniranja grba grada Rovinja: "u srebrnom crveni kriz". Za vanjske ukrase predvida one gradske, pretpostavljajuéi medutim i moguénost da stit nosi krunu markiza

Surgical approach to multifocal hepatocellular carcinoma with portal vein thrombosis and arterioportal shunt leading to portal hypertension and bleeding: a case report

It is reported the case of a 69 years man who presented to the Emergency Room because of pain and abdominal distension from ascites. After admission and paracentesis placement, he developed a digestive hemorrhage due to oesophageal varices from portal ipertension secondary to the formation of a portal shunt concomitant with a multifocal HepatoCellular Carcinoma (HCC) with portal vein thrombosis (PVT). The patient underwent endoscopic varices ligation, twice transarterial embolization (TAE) of arterial branches feeding the shunt and subsequent left hepatectomy. During the postoperative course he developed mild and transient signs of liver failure and was discharged in postoperative day 16. He is alive and disease free 8 months after surgery