8,690 research outputs found
Identifying the NMSSM by the interplay of LHC and ILC
The interplay between the LHC and the International Linear Collider
(ILC) with GeV might be crucial for the discrimination between
the minimal and next-to-minimal supersymmetric standard model. We present an
NMSSM scenario, where the light neutralinos have a significant singlino
component, that cannot be distinguished from the MSSM by cross sections and
mass measurements. Mass and mixing state predictions for the heavier
neutralinos from the ILC analysis at different energy stages and comparison
with observation at the LHC, lead to clear identification of the particle
character and identify the underlying supersymmetric model.Comment: 8 pages, 2 eps figures, revtex4 style Contribution to the `2005
International Linear Collider Workshop - Stanford, U.S.A.
Development of a task-level robot programming and simulation system
An ongoing project in developing a Task-Level Robot Programming and Simulation System (TARPS) is discussed. The objective of this approach is to design a generic TARPS that can be used in a variety of applications. Many robotic applications require off-line programming, and a TARPS is very useful in such applications. Task level programming is object centered in that the user specifies tasks to be performed instead of robot paths. Graphics simulation provides greater flexibility and also avoids costly machine setup and possible damage. A TARPS has three major modules: world model, task planner and task simulator. The system architecture, design issues and some preliminary results are given
Transbronchial catheter aspiration compared to forceps biopsy in the diagnosis of peripheral lung cancer
<p>Abstract</p> <p>Objective</p> <p>The usual procedure for obtaining material for histological analysis for the diagnosis of peripheral carcinoma of the lung is transbronchial forceps biopsy (TBB). Not widely spread is acquiring samples for cytological examination by transbronchial catheter aspiration (TBCA). Data were retrospectively collected to determine the diagnostic sensitivity of TBCA in comparison with TBB concerning malignancy.</p> <p>Methods</p> <p>We analysed the results of 51 consecutively examined patients (age 68.7 ± 8.8 yrs.) applying both methods. 48 of 51 peripheral lesions proved to be malignant, 34 of which measured > 3 cm in diameter and 14 ≤ 3 cm. Fluoroscopy provided guidance in biopsies for both techniques.</p> <p>Results</p> <p>The mean diameter of the lesion was 3.7 ± 1.5 cm. We were able to establish a correct diagnosis by TBCA in 36 of 48 patients with lung cancer, and in 21 of 48 patients by TBB (75% vs. 44%, p < 0.01, chi-square-test). By combination of both methods 39 of 48 patients were correctly diagnosed. For carcinoma > 3 cm the success rate for TBCA was 76% (26/34) and for TBB 56% (19/34). For carcinoma ≤ 3 cm the success rate for TBCA was 71% (10/14) and for TBB 14% (2/14).</p> <p>Conclusions</p> <p>Even in lesions ≤ 3 cm application of TBCA results in an only marginally lower success rate compared to lesions > 3 cm. Due to the overall high success rate we suggest to apply the easy-to-handle and inexpensive method of TBCA in diagnostic procedure of peripheral lung carcinoma.</p
Unoccupied states of individual silver clusters and chains on Ag(111)
Size-selected silver clusters on Ag(111) were fabricated with the tip of a
scanning tunneling microscope. Unoccupied electron resonances give rise to
image contrast and spectral features which shift toward the Fermi level with
increasing cluster size. Linear assemblies exhibit higher resonance energies
than equally sized compact assemblies. Density functional theory calculations
reproduce the observed energies and enable an assignment of the resonances to
hybridized atomic 5s and 5p orbitals with silver substrate states.Comment: 9 pages, 8 figure
Demonstration of the Double Penning Trap Technique with a Single Proton
Spin flips of a single proton were driven in a Penning trap with a
homogeneous magnetic field. For the spin-state analysis the proton was
transported into a second Penning trap with a superimposed magnetic bottle, and
the continuous Stern-Gerlach effect was applied. This first demonstration of
the double Penning trap technique with a single proton suggests that the
antiproton magnetic moment measurement can potentially be improved by three
orders of magnitude or more
Record statistics and persistence for a random walk with a drift
We study the statistics of records of a one-dimensional random walk of n
steps, starting from the origin, and in presence of a constant bias c. At each
time-step the walker makes a random jump of length \eta drawn from a continuous
distribution f(\eta) which is symmetric around a constant drift c. We focus in
particular on the case were f(\eta) is a symmetric stable law with a L\'evy
index 0 < \mu \leq 2. The record statistics depends crucially on the
persistence probability which, as we show here, exhibits different behaviors
depending on the sign of c and the value of the parameter \mu. Hence, in the
limit of a large number of steps n, the record statistics is sensitive to these
parameters (c and \mu) of the jump distribution. We compute the asymptotic mean
record number after n steps as well as its full distribution P(R,n). We
also compute the statistics of the ages of the longest and the shortest lasting
record. Our exact computations show the existence of five distinct regions in
the (c, 0 < \mu \leq 2) strip where these quantities display qualitatively
different behaviors. We also present numerical simulation results that verify
our analytical predictions.Comment: 51 pages, 22 figures. Published version (typos have been corrected
Durchbiegung einer elastisch eingespannten Kragplatte unter normaler Belastung
In der Arbeit wird eine theoretische Analyse der Durchbiegungen einer Kragplatte mit elastisch eingespanntem Rand durchgeführt. Dazu wurde das Differenzenverfahren angewendet. Im Vergleich mit den aus der Literatur bekannten Bedingungen wurden in den Plattenecken neue Bedingungen eingeführt, die eine bessere Übereinstimmung der theoretischen Ergebnisse mit den in der Literatur angegebenen experimentellen Ergebnissen gewährleisten
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