142,520 research outputs found
Interview with William B. Bridges
Get PDFAn interview in three sessions, in May and June 2001, and an Addendum, March 2004, with William B. Bridges, Carl F. Braun Professor of Engineering in the Division of Engineering and Applied Science. Dr. Bridges received his undergraduate and graduate education at the University of California at Berkeley (BS in electrical engineering, 1956; MS, 1957; PhD, 1962). At Berkeley in graduate school, he worked with John Whinnery and Charles K. (Ned) Birdsall on microwave vacuum tubes. He recalls that work and comments on its military applications. He then went to Hughes Research Laboratories (now HRL Laboratories LLC), for which he still is a consultant. Recalls gas laser work in the early 1960s at HRL and Bell Laboratories and the development of the argon-ion laser. In 1977 he joined the Caltech faculty with a joint appointment in electrical engineering and applied physics, while continuing to consult at Hughes. At Caltech he began working on laser isotope separation and later on far-infrared lasers. He discusses his various graduate students in electrical engineering; his colleagues John Pierce, Hardy Martel, Robert Cannon, Roy Gould, and Sverre Eng; his part in developing an undergraduate option in electrical engineering and in building up that department; his work as executive officer for electrical engineering (1978-1981). Recalls his visiting professorship at the University of Göteborg, Sweden, summer 1989; technical advisor and board member of Uniphase Corporation, a fiber-optic-communications company (now JDS Uniphase) in the 1980s and 1990s. Comments on the difficulties faced by women in engineering and his establishment of a chapter of the Society of Women Engineers at Caltech. Discusses his involvement with Caltech's Program in Advanced Technologies in partnership with TRW, Aerojet, General Motors, and GTE. Concludes the interview with his recollections of Caltech President Marvin L. (Murph) Goldberger's attempt to set up a study center at the Jet Propulsion Laboratory for the U.S. Army (the Arroyo Center) and his recollections of Goldberger's successor as president, Thomas E. Everhart, whom Bridges knew from Hughes and Berkeley.
The Addendum to the interview concerns Bridges's marriage to Linda J. McManus
Study of the decay mechanism for B+ -> p(p)over-barK(+) and B+ -> p(p)over-bar pi(+)
No full textWe study the characteristics of the low mass p (p) over bar enhancements near threshold in the three-body decays B+ -> p (p) over barK(+) and B+ -> p (p) over bar pi(+). We observe that the proton polar angle distributions in the p (p) over bar helicity frame in the two decays have the opposite polarity, and measure the forward-backward asymmetries as a function of the p mass for the p (p) over barK(+) mode. We also search for the intermediate two-body decays, B+ -> (p) over bar Delta(++) and B+ -> p (Delta) over bar (0), and set upper limits on their branching fractions. These results are obtained from a 414 fb(-1) data sample that contains 449 x 10(6) B (B) over bar events collected near the Gamma(4S) resonance with the Belle detector at the KEKB asymmetric-energy e(+)e(-) collider. (c) 2007 Elsevier B.V. All rights reserved.IPE
Pragmatic Case Studies as a Source of Unity in Applied Psychology
No full textTo unify or not to unify applied psychology: that is the question. In this article we review pendulum swings in the historical efforts to answer this question—from a comprehensive, positivist, “top-down,” deductive yes between the 1930s and the early 60s, to a postmodern no since then. A rationale and proposal for a limited, “bottom-up,” inductive yes in applied psychology is then presented, employing a case-based paradigm that integrates both positivist and postmodern themes and components. This paradigm is labeled “pragmatic psychology” and, its specific use of case studies, the “Pragmatic Case Study Method” (“PCS Method”). We call for the creation of peer-reviewed journal-databases of pragmatic case studies as a foundational source of unifying applied knowledge in our discipline. As one example, the potential of the PCS Method for unifying different angles of theoretical regard is illustrated in an area of applied psychology, psychotherapy, via the case of Mrs. B. The article then turns to the broader historical and epistemological arguments for the unifying nature of the PCS Method in both applied and basic psychology.Peer reviewe
Building Bridges: The B&R Story
No full textA 50 year history of the family owned company, B&R Enclosures, Pty Lt
Measurement of the ratio of branching fractions B(B0→K∗0γ )/B(B0s→φγ ) and the directCP asymmetry inB 0→K∗0γ
Get PDFThe ratio of branching fractions of the radiative B decays B0→K⁎0γ and B0s→ϕγ has been measured using an integrated luminosity of 1.0 fb−1 of pp collision data collected by the LHCb experiment at a centre-of-mass energy of s√=7TeV. The value obtained is
B(B0→K⁎0γ)B(B0s→ϕγ)=1.23±0.06(stat.)±0.04(syst.)±0.10(fs/fd),
where the first uncertainty is statistical, the second is the experimental systematic uncertainty and the third is associated with the ratio of fragmentation fractions fs/fd. Using the world average value for B(B0→K⁎0γ), the branching fraction B(B0s→ϕγ) is measured to be (3.5±0.4)×10−5.
The direct CP asymmetry in B0→K⁎0γ decays has also been measured with the same data and found to be
ACP(B0→K⁎0γ)=(0.8±1.7(stat.)±0.9(syst.))%.
Both measurements are the most precise to date and are in agreement with the previous experimental results and theoretical expectations
Measurement of b-hadron masses
Get PDFMeasurements of b-hadron masses are performed with the exclusive decay modes B +→J/ψK +, B 0→J/ψK +, B0→J/ψKS0, Bs0→J/ψφ and Λb0→J/ψΛ using an integrated luminosity of 35pb -1 collected in pp collisions at a centre-of-mass energy of 7 TeV by the LHCb experiment. The momentum scale is calibrated with J/ψ→μ +μ - decays and verified to be known to a relative precision of 2 ×10 -4 using other two-body decays. The results are more precise than previous measurements, particularly in the case of the Bs0 and Λb0 masses
Structural modelling of suspension bridges with particular reference to the humber bridge
No full textThis thesis was submitted for the degree of Doctor of Philosophy and awarded by Brunel University.The purpose of this research was to investigate the parameters that influence the structural behaviour of a specific suspension bridge, The Humber Bridge.
Three finite element computer models of increasing complexity were created for the analyses. They were validated against field measurements for both static and dynamic loading, and good correlation was obtained.
The programs were used to
a) Assess the integrity of the bridge as a whole were three failures of certain individual elements, such as a hanger falling under vehicle impact;
b) Determine the influence of the sizing of individual components, such as deck plate thickness or main cable diameter, on overall behaviour;
c) ascertain the capability of the structure to cope with loading (traffic, wind orthermal), above the original design values; and
d) consider the performance of the bridge had other configurations of hangers been adopted in the original design.
From the results of this work, recommendations are made which could influence the future design of long-span suspension bridges
Branching fraction and CP asymmetry of the decays B+→K0Sπ+ and B+→K0SK+
Get PDFAn analysis of B+ → K0
Sπ+ and B+ → K0
S K+ decays is performed with the LHCb experiment. The pp
collision data used correspond to integrated luminosities of 1 fb−1 and 2 fb−1 collected at centre-ofmass
energies of
√
s = 7 TeV and
√
s = 8 TeV, respectively. The ratio of branching fractions and the
direct CP asymmetries are measured to be B(B+ → K0
S K+
)/B(B+ → K0
Sπ+
) = 0.064 ± 0.009 (stat.) ±
0.004 (syst.), ACP(B+ → K0
Sπ+
) = −0.022 ± 0.025 (stat.) ± 0.010 (syst.) and ACP(B+ → K0
S K+
) =
−0.21 ± 0.14 (stat.) ± 0.01 (syst.). The data sample taken at
√
s = 7 TeV is used to search for
B+
c
→ K0
S K+ decays and results in the upper limit ( fc · B(B+
c
→ K0
S K+
))/( fu · B(B+ → K0
Sπ+
)) <
5.8 × 10−2 at 90% confidence level, where fc and fu denote the hadronisation fractions of a ¯b
quark
into a B+
c or a B+ meson, respectively
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