14,502 research outputs found

    Three Stage Bleaching of Recycled Fibers Containing 30% Groundwood

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    A three stage bleaching sequence for a mixture of recycled chemical and groundwood fibers was investigated for maximum brightness increase. The three stages consisted of a reducing or color stripping stage, an oxidizing stage, and last a mild alkaline extraction. The variables in this thesis and pH conditions in each stage and bleaching agent concentrations of each stage. At more alkaline pH\u27s and higher concentrations of hydrogen peroxide there was the greatest increase in brightness. The was no observed effect of altering the concentration of the reducing agent

    System-Size Effects on the Collective Dynamics of Cell Populations with Global Coupling

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    Phase-transitionlike behavior is found to occur in globally coupled systems of finite number of elements, and its theoretical explanation is provided. The system studied is a population of globally pulse-coupled integrate-and-fire cells subject to small additive noise. As the population size is changed, the system shows a phase-transitionlike behavior. That is, there exits a well-defined critical system size above which the system stays in a monostable state with high-frequency activity while below which a new phase characterized by alternation of high- and low frequency activities appears. The mean field motion obeys a stochastic process with state-dependent noise, and the above phenomenon can be interpreted as a noise-induced transition characteristic to such processes. Coexistence of high- and low frequency activities observed in finite size systems is reported by N. Cohen, Y. Soen and E. Braun[Physica A249, 600 (1998)] in the experiments of cultivated heart cells. The present report gives the first qualitative interpretation of their experimental results

    Class invariants for certain non-holomorphic modular functions

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    Inspired by prior work of Bruinier and Ono and Mertens and Rolen, we study class polynomials for non-holomorphic modular functions arising from modular forms of negative weight. In particular, we give general conditions for the irreducibility of class polynomials. This allows us to easily generate infintely many new class invariants

    Water Quality Control and Management of Animal Wastes Through Culture with Selected Fishes

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    Research Report 151, Final Report, Project A-083-ILL, Agreement No. 14-34-001-8015Report issued on: April 1980Submitted to unspecified recipien

    Bryophytes of Uganda : 5., Bryocrumia L.E.Anderson (Hypnaceae) ; a monotypic moss genus new to Africa

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    A number of collections from Africa identified as Phyllodon scutellifolius or Glossadelphus serpyllifolius belong to Bryocrumia vivicolor, previously known only from America and Asia. Phyllodon scutellifolius is known only from one (possibly two) collections from Madagascar, and Glossadelphus serpyllifolius is a synonym of Bryocrumia vivicolor

    Determination of the number of atoms trapped in an optical cavity

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    The number of atoms trapped within the mode of an optical cavity is determined in real time by monitoring the transmission of a weak probe beam. Continuous observation of atom number is accomplished in the strong coupling regime of cavity quantum electrodynamics and functions in concert with a cooling scheme for radial atomic motion. The probe transmission exhibits sudden steps from one plateau to the next in response to the time evolution of the intracavity atom number, from Ngreater than or equal to 3 to N=2-->1-->0 atoms, with some trapping events lasting over 1 s

    Cavity QED "By The Numbers"

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    The number of atoms trapped within the mode of an optical cavity is determined in real time by monitoring the transmission of a weak probe beam. Continuous observation of atom number is accomplished in the strong coupling regime of cavity quantum electrodynamics and functions in concert with a cooling scheme for radial atomic motion. The probe transmission exhibits sudden steps from one plateau to the next in response to the time evolution of the intracavity atom number, from N >= 3 to N = 2 to 1 to 0, with some trapping events lasting over 1 second.Comment: 5 pages, 4 figure

    Rose plant named Bucred

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    A new variety of shrub rose plant having a profuse and continuous production of medium-sized flowers of bright red coloration, the plant being free branching, bushy, and erect in its growth habit and exhibiting an ability to survive Midwestern winter temperatures without weather protection. The plant also shows good field tolerance to foliar diseases such as Blackspot and Powdery Mildew

    Elliptic Eisenstein series associated to ideals in real quadratic number fields

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    In this paper, we compute for odd fundamental discriminants D>1D>1 the Fourier expansion of non-holomorphic elliptic Eisenstein series for Γ0(D)\Gamma_0(D) with quadratic nebentypus character χD\chi_D satisfying a certain plus space condition. For each genus of Q(D)\mathbb{Q}(\sqrt{D}), we obtain an associated plus space condition and corresponding Eisenstein series in all positive even weights. In weight k=2k=2, the Fourier coefficients are associated to the geometry of Hirzebruch--Zagier divisors on Hilbert modular surfaces.Comment: 12 page

    Root behavior in fall and spring planted roses ...

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