OALib Journal期刊

ISSN: 2333-9721



匹配条件: “Karlen” ,找到相关结果约37条。
Model of Sterile Intestine of Mices with Normal Microfloras: Histological and Ultrastructural Visualization Formation Kyst Organ-Like Intestine for the Study of Interaction of Pathogen Agents with the Host Sterile Intestine  [PDF]
Karlen Hovnanyan
Open Access Library Journal (OALib Journal) , 2014, DOI: 10.4236/oalib.1100431
Abstract: For obtainment of the isolated sterile intestine, inbred lines of mice C3HA, CBA, C57BL/6, BalB/c are used at same time; it is carried out transplantation of small and large intestines of embryons corresponding lines of mice subcutaneously in adult singen mice. In capacite of test objects we make use of cultures of Salmonella typhimurium. The side of organ like kysts of isolated sterile of small and large intestines’ models on the histological and transmission electron-microscopic (TEM) preparations have their own typical composition. In case of electron-microscopic examination of steril small intestine they were revealed microvillus of epithelium, Salmonella typhimurium in lining epithelium and phagosoma of lymphoid cells of lamina propria of mucose.
Progress on the neutrino mixing angle, theta_13
D. Karlen
Physics , 2011,
Abstract: Until recently, measurements of theta_13, which describes the nu_e component in the nu_3 mass eigenstate, gave only upper limits, leaving open the possibility that it is zero and eliminating a source of CP violation in the neutrino sector. This year has seen significant advances in measuring theta_13 as precision reactor experiments move from construction phase to physics operation and accelerator experiments give first indications that theta_13 differs from zero. In the years to come, the results from these and other experiments will stringently test the PMNS framework for neutrino oscillation and will start to give information about neutrino CP violation and the neutrino mass hierarchy. This paper summarizes the situation for measuring theta_13 at this pivotal time in neutrino research.
Using projections and correlations to approximate probability distributions
Dean Karlen
Physics , 1998, DOI: 10.1063/1.168691
Abstract: A method to approximate continuous multi-dimensional probability density functions (PDFs) using their projections and correlations is described. The method is particularly useful for event classification when estimates of systematic uncertainties are required and for the application of an unbinned maximum likelihood analysis when an analytic model is not available. A simple goodness of fit test of the approximation can be used, and simulated event samples that follow the approximate PDFs can be efficiently generated. The source code for a FORTRAN-77 implementation of this method is available.
Investigation of vacuum polarization in t-channel radiative Bhabha scattering
D. Karlen,H. Burkhardt
Physics , 2001, DOI: 10.1007/s100520100783
Abstract: We discuss the possibility of a precision measurement of vacuum polarization in t-channel radiative Bhabha scattering at a high luminosity collider. For illustration, the achievable precision is estimated for the BaBar experiment at PEP-II and for the OPAL experiment at LEP.
VERITAS Observations of the Unidentified Point Source HESS J1943+213
Karlen Shahinyan for the VERITAS Collaboration
Physics , 2015,
Abstract: The H.E.S.S. Galactic plane scan has revealed a large population of Galactic very high energy (VHE; E > 100 GeV) emitters. The majority of the galactic sources are extended and can typically be associated with pulsar wind nebulae (35%) and supernova remnants (21%), while some of the sources remain unidentified (31%). A much smaller fraction of point-like sources (5 in total, corresponding to 4%) are identified as gamma-ray binaries. Active galactic nuclei located behind the Galactic plane are also a potential source class. An active galaxy could be identified in the VHE regime by a point-like appearance, a high variability amplitude (up to a factor of 100) and a typically soft spectrum (due to absorption by the extra-galactic background light). Here we report on VERITAS observations of HESS J1943+213, an unidentified point source discovered to emit above 470 GeV during the extended H.E.S.S. Galactic plane scan. This source is thought to be a distant BL Lac object behind the Galactic plane and, though it exhibits a steep spectrum it is a weak GeV source, only recently detected using 5 years of Fermi-LAT data. Deep VERITAS observations at high elevations result in the most significant VHE detection of this object so far, with an excess above 200 GeV of more than 18 standard deviations. We use variability and spectral analyses of VERITAS data on HESS J1943+213 in a multi-wavelength context to address the source classification.
VERITAS Observations of HESS J1943+213
Karlen Shahinyan for the VERITAS Collaboration
Physics , 2015,
Abstract: HESS J1943+213 is a very-high-energy (VHE; >100 GeV) gamma-ray point source detected during the H.E.S.S. Galactic Plane Survey. Radio, infrared, X-ray, and GeV gamma-ray counterparts have been identified for HESS J1943+213; however, the classification of the source is still uncertain. Recent publications have argued primarily in favor of an extreme BL Lac object behind the Galactic plane, though the scenario that HESS J1943+213 is a young pulsar wind nebula is viable as well. We present deep VERITAS observations of HESS J1943+213, which provide the most significant VHE detection of the source so far, with ~18 sigma excess. The source is detected at ~2% Crab Nebula flux above 200 GeV with VERITAS, with the source spectrum well fit by a power-law function and showing agreement with the H.E.S.S. detection. We also include results from analysis of Swift XRT observations contemporaneous with VERITAS. No significant flux or spectral variability is detected with VERITAS or Swift XRT observations. We place the VERITAS results in a multi-wavelength context to comment on the HESS J1943+213 classification.
Does P=NP?
Karlen Garnik Gharibyan
Computer Science , 2007,
Abstract: This paper has been withdrawn Abstract: This paper has been withdrawn by the author due to the publication.
Carbon Dioxide as a Microbial Toxicity Enhancer of Some Antibacterial Agents: A New Potential Water Purification Tool
Varsik Martirosyan,Karlen Hovnanyan,Sinerik Ayrapetyan
ISRN Biophysics , 2012, DOI: 10.5402/2012/906761
Antioxidants as effective remedies at hepatotoxic action of carbon tetrachloride  [PDF]
Karlen Hovnanyan, Vardan Mamikonyan, Anahit Margaryan, Kristine Sargsyan, Margarita Hovnanyan, Maria Karagyozyan, Konstantin Karageuzyan
Journal of Biophysical Chemistry (JBPC) , 2014, DOI: 10.4236/jbpc.2014.51001
The liver, as the central metabolic organ, plays an important role in metabolism of carbohydrates, lipids and proteins. In the environment, there are many hepatotoxic xenobiotics. CCl4 is a free radical toxic for organelles of hepatocytes. The presented work was studying the character of ultrastructural changes in CCl4-intoxicated hepatocytes as well as the tissue after treatment by grape seed extract (GSE), α-tocopherol (α-T). As a result of cell bioremediation effect and reactions against corruptive factors, the liver has a high regeneration ability.
TPC Performance in Magnetic Fields with GEM and Pad Readout
D. Karlen,P. Poffenberger,G. Rosenbaum
Physics , 2005, DOI: 10.1016/j.nima.2005.09.008
Abstract: A novel charged particle tracking device, a high precision time projection chamber with gas electron multiplier and pad readout, is a leading candidate as the central tracker for an experiment at the International Linear Collider. To characterize the performance of such a system, a small TPC has been operated within a magnetic field, measuring cosmic-ray and laser tracks. Good tracking resolution and two particle separation, sufficient for a large scale ILC central tracker, are achieved.

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