400 research outputs found
s-ordered phase-sum and phase-difference distribuitons of entangled coherent states
The -ordered phase-sum and phase-difference distributions are considered
for Bell-like superpositions of two-mode coherent states. The distributions are
sensitive, respectively, to the sum and difference of the phases of the
entangled coherent states. They show loss of information about the entangled
state and may take on negative values for some orderings .Comment: 8 pages, 2 figures, iopart. accepted for publication in J. Opt. B:
Quantum Semiclass Op
Stabilization of high-order solutions of the cubic Nonlinear Schrodinger Equation
In this paper we consider the stabilization of non-fundamental unstable
stationary solutions of the cubic nonlinear Schrodinger equation. Specifically
we study the stabilization of radially symmetric solutions with nodes and
asymmetric complex stationary solutions. For the first ones we find partial
stabilization similar to that recently found for vortex solutions while for the
later ones stabilization does not seem possible
Expecting the Unexpected: Radiation Hardened Software
Radiation induced Single Event Effects (SEEs) are a serious problem for spacecraft flight software, potentially leading to a complete loss of mission. Conventional risk mitigation has been focused on hardware, leading to slow, expensive and outdated on-board computing devices, increased power consumption and launch mass. Our approach is to look at SEEs from a software perspective, and to explicitly design flight software so that it can detect and correct the majority of SEES. Radiation hardened flight software will reduce the significant residual residual risk for critical missions and flight phases, and enable more use of inexpensive and fast COTS hardware
Quantum spiral bandwidth of entangled two-photon states
We put forward the concept of quantum spiral bandwidth of the spatial mode
function of the two-photon entangled state in spontaneous parametric
downconversion. We obtain the bandwidth using the eigenstates of the orbital
angular momentum of the biphoton states, and reveal its dependence with the
length of the down converting crystal and waist of the pump beam. The
connection between the quantum spiral bandwidth and the entropy of entanglement
of the quantum state is discussed.Comment: 10 pages, 3 figure
Wiselib: A Generic Algorithm Library for Heterogeneous Sensor Networks
One unfortunate consequence of the success story of wireless sensor networks
(WSNs) in separate research communities is an ever-growing gap between theory
and practice. Even though there is a increasing number of algorithmic methods
for WSNs, the vast majority has never been tried in practice; conversely, many
practical challenges are still awaiting efficient algorithmic solutions. The
main cause for this discrepancy is the fact that programming sensor nodes still
happens at a very technical level. We remedy the situation by introducing
Wiselib, our algorithm library that allows for simple implementations of
algorithms onto a large variety of hardware and software. This is achieved by
employing advanced C++ techniques such as templates and inline functions,
allowing to write generic code that is resolved and bound at compile time,
resulting in virtually no memory or computation overhead at run time.
The Wiselib runs on different host operating systems, such as Contiki, iSense
OS, and ScatterWeb. Furthermore, it runs on virtual nodes simulated by Shawn.
For any algorithm, the Wiselib provides data structures that suit the specific
properties of the target platform. Algorithm code does not contain any
platform-specific specializations, allowing a single implementation to run
natively on heterogeneous networks.
In this paper, we describe the building blocks of the Wiselib, and analyze
the overhead. We demonstrate the effectiveness of our approach by showing how
routing algorithms can be implemented. We also report on results from
experiments with real sensor-node hardware.Comment: 16 pages, 1 figure, 7 tables. Appears in European Conference on
Wireless Sensor Networks (EWSN 2010
Effect of Surgical Margin Width on Patterns of Recurrence among Patients Undergoing R0 Hepatectomy for T1 Hepatocellular Carcinoma: an International Multi-Institutional Analysis
Introduction: Although a positive surgical margin is a known prognostic factor for recurrence, the optimal surgical margin width in the context of an R0 resection for early-stage hepatocellular carcinoma (HCC) is still debated. The aim of the current study was to examine the impact of wide (> 1 cm) versus narrow (< 1 cm) surgical margin status on the incidence and recurrence patterns among patients with T1 HCC undergoing an R0 hepatectomy.
Methods: Between 1998 and 2017, patients with T1 HCC who underwent R0 hepatectomy for stage T1 HCC were identified using an international multi-institutional database. Recurrence-free survival (RFS) was estimated, and recurrence patterns were examined based on whether patients had a wide versus narrow resection margins.
Results: Among 404 patients, median patient age was 66 years (IQR: 58-73). Most patients (n = 326, 80.7%) had surgical margin 1 cm margin. The majority of patients had early recurrences ( 1 cm: 85.7%, p = 0.141); recurrence site was mostly intrahepatic ( 1 cm: 61.9%, p = 0.169). The 1-, 3-, and 5-year RFS among patients with margin 1 cm, respectively (p = 0.02). Among patients undergoing anatomic resection, resection margin did not impact RFS (3-year RFS: 1 cm: 58.9%, p = 0.169), whereas in the non-anatomic resection group, margin width > 1 cm was associated with a better 3-year RFS compared to margin 1 cm remained protective against recurrence (HR = 0.50, 95%CI 0.28-0.89), whereas Child-Pugh B (HR = 2.13, 95%CI 1.09-4.15), AFP > 20 ng/mL (HR = 1.71, 95%CI 1.18-2.48), and presence of microscopic lymphovascular invasion (HR = 1.48, 95%CI 1.01-2.18) were associated with a higher hazard of recurrence.
Conclusion: Resection margins > 1 cm predicted better RFS among patients undergoing R0 hepatectomy for T1 HCC, especially small (< 5 cm) HCC. Although resection margin width did not influence outcomes after anatomic resection, wider margins were more important among patients undergoing non-anatomic liver resections.info:eu-repo/semantics/publishedVersio
Liver transplantation in Romania
Institultul Clinic Fundeni-Clinica Chirurgie GeneralÄ Èi Transplant Hepatic âDan Setlacecâ, Al XI-lea Congres al AsociaÈiei Chirurgilor âNicolae Anestiadiâ din Republica Moldova Èi cea de-a XXXIII-a Reuniune a Chirurgilor din Moldova âIacomi-RÄzeÈuâ 27-30 septembrie 2011Analiza retrospectivÄ a 300 de transplanturi hepatice efectuate Ăźn Centrul de Chirurgie GeneralÄ Èi Transplant Hepatic âDan Setlacec â.Retrospective analysis of 300 liver transplantation performed in General Surgery Center and Liver Transplantation âDan Setlacecâ
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