Anisotropic exciton Stark shift in black phosphorus

We calculate the excitonic spectrum of few-layer black phosphorus by direct diagonalization of the effective mass Hamiltonian in the presence of an applied in-plane electric field. The strong attractive interaction between electrons and holes in this system allows one to investigate the Stark effect up to very high ionizing fields, including also the excited states. Our results show that the band anisotropy in black phosphorus becomes evident in the direction dependent field induced polarizability of the exciton

Anomalous single production of fourth generation t′t' quarks at ILC and CLIC

We present a detailed study of the anomalous single fourth generation $t'$ quark production within the dominant Standard Model(SM) decay modes at future $e^+e^-$ colliders. We calculate the signal and background cross sections in the mass range 300-800 GeV. We also discuss the limits of $t'q\gamma$ and $t'qZ$ ($q=u,c$) anomalous couplings as well as values of attainable integrated luminosity for 3$\sigma$ observation limit.Comment: 12 pages, 14 figures, version to be published on Nucl.Phys.

Down Type Isosinglet Quarks in ATLAS

We evaluate the discovery reach of the ATLAS experiment for down type isosinglet quarks, $D$, using both their neutral and charged decay channels, namely the process $pp\to D\bar{D}+X$ with subsequent decays resulting in $2\ell+2j+E^{miss}_{T}$, $3\ell+2j+E^{miss}_{T}$ and $2\ell+4j$ final states. The integrated luminosity required for observation of a heavy quark is estimated for a mass range between 600 and 1000 GeV using the combination of results from different search channels.Comment: 12 page

Anomalous single production of the fourth SM family quarks at Tevatron

Possible single productions of fourth family u_{4} and d_{4} quarks via anomalous q_{4}qV interactions at Tevatron are studied. Signature of such processes are discussed and compared with the recent results from Tevatron.Comment: 6 pages, 1 figure, 4 table

Advanced oxidation protein products and malondialdehyde — the new biological markers of oxidative stress — are elevated in postmenopausal women

Objectives: The aim of the study was to measure advanced oxidation protein products (AOPPs) as markers for oxidative stress to evaluate cardiovascular risk in pre- and postmenopausal women and to compare the results with malondialde­hyde (MDA) levels. Material and methods: Twenty premenopausal women and 84 naturally postmenopausal patients were enrolled in the study. AOPP and MDA plasma levels were measured. The postmenopausal group was further subdivided into two groups: postmenopausal age of 40–49 and of 50–59 years. AOPP and MDA levels were compared between premenopausal, 40–49 and 50–59 year old menopausal women. Results: Plasma AOPP and MDA levels in postmenopausal women were increased when compared with their premeno­pausal peers (123.83 ± 55.51 μmol/L vs. 61.59 ± 16.42 μmol/L and 6.50 ± 1.05 μmol/L vs. 5.98 ± 0.77 μmol/L; respectively). Mean plasma AOPP levels in the two menopausal age groups were both significantly higher from the premenopausal group (118.64 ± 59.1 μmol/L vs. 61.59 ± 16.42 μmol/L and 132.31 ± 48.97 μmol/L vs. 61.59 ± 16.42 μmol/L; respectively). No significant difference was found in mean AOPP levels between postmenopausal subjects of 40–49 and 50–59 years age (118.64 ± 59.12 μmol/L vs. 132.31 ± 48.97 μmol/L). Mean plasma MDA levels of each of two postmenopausal age groups were both significantly higher from the premenopausal group (6.50 ± 1.04 μmol/L vs. 5.98 ± 0.77 μmol/L and 6.50 ± 1.10 μmol/L vs. 5.98 ± 0.77 μmol/L; respectively). However, no statistically significant difference between the two postmenopausal age groups (6.50 ± 1.04 μmol/L vs. 6.50 ± 1.10 μmol/L) was found. Conclusions: AOPP and MDA levels are elevated in postmenopausal women as compared to their premenopausal peers, suggesting they can be used as markers for cardiovascular risk in postmenopausal women

Nearest-Neighbor based Metric Functions for indoor scene recognition

Indoor scene recognition is a challenging problem in the classical scene recognition domain due to the severe intra-class variations and inter-class similarities of man-made indoor structures. State-of-the-art scene recognition techniques such as capturing holistic representations of an image demonstrate low performance on indoor scenes. Other methods that introduce intermediate steps such as identifying objects and associating them with scenes have the handicap of successfully localizing and recognizing the objects in a highly cluttered and sophisticated environment. We propose a classification method that can handle such difficulties of the problem domain by employing a metric function based on the Nearest-Neighbor classification procedure using the bag-of-visual words scheme, the so-called codebooks. Considering the codebook construction as a Voronoi tessellation of the feature space, we have observed that, given an image, a learned weighted distance of the extracted feature vectors to the center of the Voronoi cells gives a strong indication of the image's category. Our method outperforms state-of-the-art approaches on an indoor scene recognition benchmark and achieves competitive results on a general scene dataset, using a single type of descriptor. © 2011 Elsevier Inc. All rights reserved

Fourth Generation Pseudoscalar Quarkonium Production and Observability at Hadron Colliders

The pseudoscalar quarkonium state, eta_4 1^S_0, formed by the Standard Model (SM) fourth generation quarks, is the best candidate among the fourth generation quarkonia to be produced at the LHC and VLHC. The production of this J^{PC} = 0^{-+} resonance is discussed and the background processes are studied to obtain the integrated luminosity limits for the discovery, depending on its mass.Comment: 13 pages, 4 figures, 5 table