252 research outputs found
Inherent radioresistance of head and neck squamous cell carcinoma cells: principal component analysis identifies cellular senescence as a crucial driver
No full textInherent radioresistance of head and neck squamous cell carcinoma cells: principal component analysis identifies cellular senescence as a crucial driver
No full textSpontaneous-search method and short-time dynamics: applications to the Domany-Kinzel cellular automaton
No full textThe one-dimensional Domany-Kinzel cellular automaton is investigated by two numerical approaches: (i) the spontaneous-search method, which is a method appropriated for a search of criticality; (ii) short-time dynamics. Both critical frontiers of the system are investigated, namely, the one separating the frozen and active phases, as well as the critical line determined by damage spreading between two cellular automata, that splits the active phase into the nonchaotic and chaotic phases. The efficiency of the spontaneous-search method is established herein through a precise estimate of both critical frontiers, and in addition to that, it is shown that this method may also be used in the determination of the critical exponent ν ⊥ . Using the critical frontiers obtained, other exponents are estimated through short-time dynamics. It is verified that the critical exponents of both critical frontiers fall in the universality class of directed percolation. Copyright EDP Sciences/Società Italiana di Fisica/Springer-Verlag 200805.70.Ln Nonequilibrium and irreversible thermodynamics, 64.60.Ht Dynamic critical phenomena, 64.60.-i General studies of phase transitions,
1951 Jay-Cee-An BJC - Page 34
No full textPhotographs of BJC college freshmenFront
Etta Evans
Joanne Ehley
Back
Winston Fahlgren
William Drew
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1952 Jay-Cee-An BJC -- Page 44
No full textPhotographs of the Newman Club (Catholic students club) and the Lutheran Student AssociationNEWMAN CLUB
L to R: 1st Row: Art Wanke, Vice-
President; Mar i 1Yn Duerre,
President; Vergie Swanson, Stu-dent
Association Representative;
Carol Bucklin, Secretary.
2nd Row: Darlyne Winmill,
Donna Salvesen, Myrna Zander,
Alyce Mae Ellison.
3rd Row: Mike Wickstrom, Patty
Hook, Dale Albers, Anna Mae
Nelson, Neale Linzbach.
L to R: 1st Row: Margaret Chesire,
Vice-President; Bob Deckert,
Treasurer; Greta Van Wyk,
President.
2nd Row: Bette Kautzmann,
Shirley Gallagher, Monica Ches-ire,
Miss Hansen, Mona Bosch,
Mrs. Delores Lindbeck.
31'd Row: Marilyn Kinzel, John
Haider, Jack Kenney, Morris
Tschider, Ed Kary, Joe Ciava-rella.
LUTHERAN STUDENTS ASSOCIATION
4
Ridge aperture antenna array as a high efficiency coupler for photovoltaic applications
No full textWeak absorption of light near the absorption band edge of a photovoltaic material is one limiting factor on the efficiency of photovoltaics. This is particularly true for silicon thin-film solar cells because of the short optical path lengths and limited options for texturing the front and back surfaces. Directing light laterally is one way to increase the optical path length and absorption. We investigate the use of a periodic array of apertures originated from bowtie aperture antennas to couple incident light into guided modes supported within a thin silicon film. We show the presence of the aperture array can increase the efficiency of a solar cell by as much as 39%. (C) 2011 Society of Photo-Optical Instrumentation Engineers (SPIE). [DOI: 10.1117/1.3644613
The Palladium-Catalyzed Trifluoromethylation of Aryl Chlorides
No full textavailable in PMC 2011 June 25.The trifluoromethyl group can dramatically influence the properties of organic molecules, thereby increasing their applicability as pharmaceuticals, agrochemicals, or building blocks for organic materials. Despite the importance of this substituent, no general method exists for its installment onto functionalized aromatic substrates. Current methods either require the use of harsh reaction conditions or suffer from a limited substrate scope. Here we report the palladium-catalyzed trifluoromethylation of aryl chlorides under mild conditions, allowing the transformation of a wide range of substrates, including heterocycles, in excellent yields. The process tolerates functional groups such as esters, amides, ethers, acetals, nitriles, and tertiary amines and, therefore, should be applicable to late-stage modifications of advanced intermediates. We have also prepared all the putative intermediates in the catalytic cycle and demonstrated their viability in the process.National Institutes of Health (U.S.) (NIH grant GM46059)Alexander von Humboldt-Stiftung (Feodor Lynen Postdoctoral Fellowship)Merck Research LaboratoriesNippon Chemical Industrial Co.Boehringer Ingelheim PharmaceuticalsBAS
Erratum: Search for gravitational waves from compact binary coalescence in LIGO and Virgo data from S5 and VSR1 (Physical Review D - Particles, Fields, Gravitation and Cosmology)
No full textThis paper was published online on 5 November 2010 with an omission in the Collaboration author list. S. Dwyer has
been added as of 12 April 2012. The Collaboration author list is incorrect in the printed version of the journal
Range expansion with mutation and selection: dynamical phase transition in a two-species Eden model
No full textThe colonization of unoccupied territory by invading species, known as range expansion, is a spatially heterogeneous non-equilibrium growth process. We introduce a two-species Eden growth model to analyze the interplay between uni-directional (irreversible) mutations and selection at the expanding front. While the evolutionary dynamics leads to coalescence of both wild-type and mutant clusters, the non-homogeneous advance of the colony results in a rough front. We show that roughening and domain dynamics are strongly coupled, resulting in qualitatively altered bulk and front properties. For beneficial mutations the front is quickly taken over by mutants and growth proceeds Eden-like. In contrast, if mutants grow slower than wild-types, there is an antagonism between selection pressure against mutants and growth by the merging of mutant domains with an ensuing absorbing state phase transition to an all-mutant front. We find that surface roughening has a marked effect on the critical properties of the absorbing state phase transition. While reference models, which keep the expanding front flat, exhibit directed percolation critical behavior, the exponents of the two-species Eden model strongly deviate from it. In turn, the mutation-selection process induces an increased surface roughness with exponents distinct from that of the classical Eden model
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