643 research outputs found
The George H.N. Luhrs Family in Phoenix and Arizona, 1847-1984
No full textThe detailed memoir of the Luhrs Family's businesses and personal activities in Phoenix and elsewhere.Digitized in December 2014 from copy 71 of 150 copies produced with the generous support of the Luhrs Family Endowment
The Contradiction and inexpressibility in Ch'an Kung-an (Koan)
No full textThere are three types of Ch’an kung-an that often bewilder Buddhologists; namely, (1)the contradictory, (2)the inexpressible, and (3)mixture of the two. D. T. Suzuki and the scholars influenced by him, for example, E. Fromm, think that these three types of kung-an imply the truth realized by Ch’an masters, the truth which goes beyond daily language and logic. However, as the author points out, there are two traditions in Ch’an School: (1)the “Buddha-nature” tradition based on the La?k?vat?ra S?tra, and (2)the prajna tradition based on the Diamond S?tra. Suzuki and Formm’s interpretation only emphasizes the first tradition and ignores the second one. According to the second tradition, the contradiction and inexpressibility of kung-an may seem to indicate the truth of non-existence-??nyat?, not necessarily indicating the truly existing “Buddha-nature”
Waterflood-induced hydraulic fracturing
No full textCivil EngineeringCivil Engineering and Geoscience
Design and construction of a Vertex Chamber and measurement of the average B-Hadron lifetime
No full textFour parameters describe the mixing of the three quark generations in the Standard Model of the weak charged current interaction. These four parameters are experimental inputs to the model. A measurement of the mean lifetime of hadrons containing b-quarks, or B-Hadrons, constrains the magnitudes of two of these parameters. Measurement of the B-Hadron lifetime requires a device that can measure the locations of the stable particles that result from B-Hadron decay. This device must function reliably in an inaccessible location, and survive high radiation levels. We describe the design and construction of such a device, a gaseous drift chamber. Tubes of 6.9 mm diameter, having aluminized mylar walls of 100 ..mu..m thickness are utilized in this Vertex Chamber. It achieves a spatial resolution of 45 ..mu..m, and a resolution in extrapolation to the B-Hadron decay location of 87 ..mu..m. Its inner layer is 4.6 cm from e/sup +/e/sup -/ colliding beams. The Vertex Chamber is situated within the MAC detector at PEP. We have analyzed botht he 94 pb/sup -1/ of integrated luminosity accumulated at ..sqrt..s = 29 GeV with the Vertex Chamber in place as well as the 210 pb/sup -1/ accumulated previously. We require a lepton with large momentum transverse to the event thrust axis to obtain a sample of events enriched in B-Hadron decays. The distribution of signed impact parameters of all tracks in these events is used to measure the B-Hadron flight distance, and hence lifetime. 106 refs., 79 figs., 20 tabs
Book Review: The Mammals of the Southern African Subregion
No full textBook Title: The Mammals of the Southern African SubregionBook Author: Reay H.N. SmithersUniversity of Pretoria, Pretoria, 1983. 736 pp.
Mosses new to Hong Kong (1)
No full textTen moss species - Garkea flexuosa (Griffith) Marg. & Nork., Campylopus laxitextus Lac., Fissidens dubius P. Beauv., Fissidens ceylonensis Dozy & Molk, Fissidens maceratus Mitt., Philonotis thwaitesii Mitt., Isopterygium minutirameum (C. Muell.)Jaeg., Homalia trichomanoides (Hedw.) B.S.G., Pogonatum neesii (C. Muell.) Dozyand Polytrichum formosum Hedw. are reported new to Hong Kong. Among them, five are new to Guangdong Province of China
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Results from the MAC Vertex chamber
No full textThe design, construction, and performance characteristics of a high precision gaseous drift chamber made of thin walled proportional tubes are described. The device achieved an average spatial resolution of 45 ..mu..m in use for physics analysis with the MAC detector. The B-lifetime result obtained with this chamber is discussed
Consistency of Bayesian inference with Gaussian process priors for a parabolic inverse problem
No full textWe consider the statistical non-linear inverse problem of recovering the absorption term f > 0 in the heat equation {∂tu-12Δu+fu=0onO×(0,T)u=gon∂ O×(0,T)u(·,0)=u0onO, where O ϵ ℝd is a bounded domain, T < ∞ is a fixed time, and g, u 0 are given sufficiently smooth functions describing boundary and initial values respectively. The data consists of N discrete noisy point evaluations of the solution u f on O×(0,T) . We study the statistical performance of Bayesian nonparametric procedures based on a large class of Gaussian process priors. We show that, as the number of measurements increases, the resulting posterior distributions concentrate around the true parameter generating the data, and derive a convergence rate for the reconstruction error of the associated posterior means. We also consider the optimality of the contraction rates and prove a lower bound for the minimax convergence rate for inferring f from the data, and show that optimal rates can be achieved with truncated Gaussian priors.Statistic
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