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Search Results: 1 - 10 of 2128 matches for " Danielle Boller "
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Cesaro asymptotic equipartition of energy in the coupled case
Stefan Boller
Electronic Journal of Differential Equations , 2000,
Abstract: It is well known from earlier results that certain types of selfadjoint operators, e.g. operators allowing a representation as operator matrices, show equipartition of energy. In this paper we examine the question whether there are more selfadjoint operators showing equipartition of energy in the Cesaro mean. For this purpose we proof a necessary and sufficient criterion for equipartition of energy and use this criterion to show equipartition for a system of partial differential equations with a coupled boundary condition.
Soft X-ray properties of Ultraluminous IRAS Galaxies
Th. Boller
Physics , 1999,
Abstract: A sample of 323 Ultraluminous IRAS galaxies (ULIRGs) has been correlated with the ROSAT All-Sky Survey and ROSAT public pointed observations. 22 objects are detected in ROSAT survey observations, and 6 ULIRGs are detected in addition in ROSAT public pointed observations. The detection is based on a visual inspection of the X-ray contour maps overlaid on optical images of ULIRGs taken from the Digitized Sky Survey. Simple power law fits were used to compute the absorption-corrected fluxes of the ROSAT detected ULIRGs. The ratio of the soft X-ray flux to the far-infrared luminosity is used to estimate the contribution from starburst and AGN emitting processes. These results are compared with the ISO SWS ULIRG diagnostic diagram.
Chracterization of Cyclic and Separating Vectors and Application to an Inverse Problem in Modular Theory I. Finite Factors
Stefan Boller
Physics , 2000,
Abstract: In this paper we examine an inverse problem in the modular theory of von Neumann algebras in the case of finite factors. First we give a characterization of cyclic and separating vectors for finite factors in terms of operators associated with this vector and being affiliated with the factor. Further we show how this operator generates the modular objects of the given cyclic and separating vector generalizing an idea of Kadison and Ringrose. With the help of these rather technical results we show under an appropriate condition, which is always fulfilled for finite type I factors, that there exists another simple class of solutions of the inverse problem beside a trivial one which always exists. Finally we give a complete classification of the solutions of the inverse problem in the case of modular operators having pure point spectrum which is no restriction in the type I case. In a subsequent paper these results will be generalized to all semifinite factors.
ROSAT Results on Narrow-Line Seyfert 1 Galaxies
Th. Boller
Physics , 2000, DOI: 10.1016/S1387-6473(00)00066-X
Abstract: The excellent soft X-ray sensitivity of the PSPC detector onboard the ROSAT satellite provided the first chance to study precisely the spectral and timing properties of Narrow-Line Seyfert 1 galaxies. ROSAT observations of Narrow-Line Seyfert 1 galaxies have revealed (1) the existence of a giant soft X-ray excess, (2) a striking, clear correlation between the strength of the soft X-ray excess emission and the FWHM of the H-beta line, (3) the general absence of significant soft X-ray absorption by neutral hydrogen above the Galactic column, (4) short doubling time scales down to about 1000 seconds, (5) the existence of persistent giant (above a factor of 10), and rapid (less than 1 day) X-ray variability in extragalactic sources. The soft X-ray results on Narrow-Line Seyfert 1 galaxies indicate that their black hole regions are directly visible, further supporting the Seyfert 1 nature of these objects. The extreme X-ray properties of Narrow-Line Seyfert 1 galaxies make them ideal objects for understanding many of the problems raised generally by the Seyfert phenomenon.
Characterization of Cyclic and Separating Vectors and Application to an Inverse Problem in Modular Theory, II. Semifinite Factors
Stefan Boller
Physics , 2000,
Abstract: This paper generalizes the results obtained in an earlier paper (math.OA/0003087) for finite factors to infinite but still semifinite factors. First we give a characterization of cyclic and separating vectors for infinite semifinite factors in terms of operators associated with this vector and being affiliated with the factor. Further we show how this operator generates the modular objects of the given cyclic and separating vector generalizing an idea of Kadison and Ringrose. With the help of these results we can show that the second simple class of solutions for the inverse problem constructed in math.OA/0003087 never exists in infinite semifinite factors. Finally we give a classification of the solutions of the inverse problem in the case of modular operators having pure point spectrum, completely analoguous to the finite case.
Applications of Forensic Science in Private Security  [PDF]
Danielle Sapse
Beijing Law Review (BLR) , 2013, DOI: 10.4236/blr.2013.44017
Abstract:

Private security guards are a necessity at the present time, as a complement of the police departments in order to combat crime and terrorism. Both police forces and private security organizations are greatly helped in their work by the methods of forensic science. Forensic science applies scientific methods to the solving of crimes. These methods include fingerprinting, drug analysis, DNA (Deoxyribonucleic Acid) studies, ballistics, arson and explosive investigations, and studies of glass fragments. Fingerprinting and urine, saliva, or hair analysis for the presence of drugs are essential for the hiring of private security guards, in order to establish their suitability for the position.

Targeting Class IA PI3K Isoforms Selectively Impairs Cell Growth, Survival, and Migration in Glioblastoma
Katrin H?land, Danielle Boller, Christian Hagel, Silvia Dolski, András Treszl, Olivier E. Pardo, Paulina ?wiek, Fabiana Salm, Zaira Leni, Peter R. Shepherd, Beata Styp-Rekowska, Valentin Djonov, André O. von Bueren, Karl Frei, Alexandre Arcaro
PLOS ONE , 2014, DOI: 10.1371/journal.pone.0094132
Abstract: The phosphoinositide 3-kinase (PI3K)/Akt/mammalian target of rapamycin (mTOR) pathway is frequently activated in human cancer and plays a crucial role in glioblastoma biology. We were interested in gaining further insight into the potential of targeting PI3K isoforms as a novel anti-tumor approach in glioblastoma. Consistent expression of the PI3K catalytic isoform PI3K p110α was detected in a panel of glioblastoma patient samples. In contrast, PI3K p110β expression was only rarely detected in glioblastoma patient samples. The expression of a module comprising the epidermal growth factor receptor (EGFR)/PI3K p110α/phosphorylated ribosomal S6 protein (p-S6) was correlated with shorter patient survival. Inhibition of PI3K p110α activity impaired the anchorage-dependent growth of glioblastoma cells and induced tumor regression in vivo. Inhibition of PI3K p110α or PI3K p110β also led to impaired anchorage-independent growth, a decreased migratory capacity of glioblastoma cells, and reduced the activation of the Akt/mTOR pathway. These effects were selective, because targeting of PI3K p110δ did not result in a comparable impairment of glioblastoma tumorigenic properties. Together, our data reveal that drugs targeting PI3K p110α can reduce growth in a subset of glioblastoma tumors characterized by the expression of EGFR/PI3K p110α/p-S6.
Piagetian Theory in Online Teacher Education  [PDF]
Danielle E. Kaplan, Danielle E. Kaplan
Creative Education (CE) , 2018, DOI: 10.4236/ce.2018.96061
Abstract: This research involves the study of Piagetian Theory in Online Teacher Education. Piagetian theories were included in an online course in cognition and critical thinking in education as foundational psychological frameworks to apply to educational practice. Participants applied theoretical frameworks in instruction and learning design in the form of lessons and projects. Lessons and projects were analyzed for understanding and application of theory.
Efeito da press?o de trabalho e de modelos de pontas de pulveriza??o sobre a eficiência de herbicida de contato em soja
Boller, Walter;Machry, Marcos;
Engenharia Agrícola , 2007, DOI: 10.1590/S0100-69162007000400015
Abstract: in recent years, contact herbicides have been sprayed, with reduced spray volumes, using spray nozzles that work at low pressures. to evaluate the flat fan spray nozzles of teejet series xr, dg, tt and ai operated at different pressures, it was conducted an experiment for hairy beggar ticks (bidens spp.) control. the experiment was carried out in passo fundo municipality (brazil), using bentazon contact herbicide in a soybean culture. the xr 110015, dg 110015 and tt 110015 nozzles were operated with pressure levels of 100; 200 and 300 kpa, and the ai 110015 nozzle with pressures of 200; 300 and 400 kpa. it was evaluated the hairy beggar ticks control at 7; 14 and 21 days after treatment and the grain yield of soybean. the ai 110015 nozzle showed inappropriate for this herbicide application in all evaluated pressures. pressure of 100 kpa for the series xr, dg and tt, nozzles, were inadequate to use for contact post emergence herbicide application. all evaluated nozzles showed improved efficiency with the increase of pressure.
X-ray variability and spectral scaling: a measure of BLR sizes in AGN
Amri Wandel,Thomas Boller
Physics , 1997,
Abstract: We apply a new method of determination of the size of the broad emission-line region (BLR) in active galactic nuclei. This method relates the radius of the broad-line region of AGN to the soft X-ray luminosity and spectral index. Comparing the BLR distances calculated from our photoionization scaling model to the BLR distances determined by reverberation mapping shows that the scaling law agrees with the $R\sim L^{1/2}$ empirical relation. We investigate a complimentary method of estimating the BLR distance - based on the Keplerian broadening of the emission lines and the central mass estimated from X-ray variability.
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