4,008 research outputs found

    On ā„“-adic representations for a space of noncongruence cuspforms

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    This paper is concerned with a compatible family of 4-dimensional ā„“-adic representations Ļā„“ of GQ := Gal(Q/Q) attached to the space of weight-3 cuspforms S3(Ī“) on a noncongruence subgroup Ī“ āŠ‚ SL2(Z). For this representation we prove that: 1. It is automorphic: the L-function L(s,Ļā„“āˆØ) agrees with the L-function for an automorphic form for GL4(AQ), where Ļā„“āˆØ is the dual of Ļā„“. 2. For each prime pā‰„5 there is a basis hp = {hp+, hp-} of S3(Ī“) whose expansion coefficients satisfy 3-term Atkin and Swinnerton-Dyer (ASD) relations, relative to the q-expansion coefficients of a newform f of level 432. The structure of this basis depends on the class of p modulo 12. The key point is that the representation Ļā„“ admits a quaternion multiplication structure in the sense of Atkin, Li, Liu, and Long

    Disinflation, equity valuation, and investor rationality

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    An examination of the relationship between inflation and equity prices, concluding that equity prices respond rationally to such factors as real interest rates and risk.Corporations - Finance ; Inflation (Finance) ; Stocks

    The cerebrospinal fluid protein

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    Thesis (M.D.)--Boston Universit

    The Buoyant Behavior of Viral and Bacterial DNA in Alkaline CsCl

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    In equilibrium density gradient centrifugation, the banding polymer species is electrically neutral. The banding species for a negative polyelectrolyte with a polyanion P_(n)^(-z)n (where n is the degree of polymerization, and z the titration charge per monomer unit) in a CsCl salt gradient is CS_(zn)P_n. If the ion P_(n)^(-z)n is itself a weak acid, it may be titrated to the state P_(n)^(-(Zn+y)) by CsOH; the banding species is then Cs_(zn+y)P_n. Because of the large mass and high effective "density" of a Cs^+ ion, it is to be expected that the buoyant density in a CsCl gradient of a polymer acid will be increased by such a partial alkaline titration with CsOH. This expectation has been confirmed for polyglutamic acid (where z = 0 at low pH). The guanine and thymine monomer units of DNA are weak acids. The present communication is concerned with the increase in buoyant density of DNA in alkaline CsCl solutions. It is well known that the guanine and thymine protons are more readily titrated in denatured DNA than in native DNA. We find that the buoyant density of denatured DNA and of single strand Ļ•X-174 DNA gradually increases as the pH of the solution is increased beyond pH 9.8. The density of native DNA is not affected until a critical pH > 11 is reached, where the DNA abruptly denatures and increases in density. Similar increases in buoyant density have been observed independently by Baldwin and Shooter in their studies of 5BU[overbar]-substituted DNA's in alkaline solutions

    Eigenspace techniques for active flutter suppression

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    The use of eigenspace techniques for the design of an active flutter suppression system for a hypothetical research drone is discussed. One leading edge and two trailing edge aerodynamic control surfaces and four sensors (accelerometers) are available for each wing. Full state control laws are designed by selecting feedback gains which place closed loop eigenvalues and shape closed loop eigenvectors so as to stabilize wing flutter and reduce gust loads at the wing root while yielding accepatable robustness and satisfying constrains on rms control surface activity. These controllers are realized by state estimators designed using an eigenvalue placement/eigenvector shaping technique which results in recovery of the full state loop transfer characteristics. The resulting feedback compensators are shown to perform almost as well as the full state designs. They also exhibit acceptable performance in situations in which the failure of an actuator is simulated
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