80,493 research outputs found
Letter from J. M. Anthony to Comissioner of Indian Affairs, 1867
No full textEnclosed two vouchers for Indian Service in California owned by E. T. Anthony
Physical and Mathematical Modeling of the HYKAT
No full textHYKAT is an acronym for a water tunnel that will be used for both
hydroacoustic and cavitation testing. It has a somewhat different configuration
than conventional water tunnels, and therefore has been subjected to
conHiderable analysis. The first studies carried out at the St. Anthony Falls
llydraulic Laboratory were primarily concerned with the overall characteristics
of the facility. These studies resulted in a recommendation for the shape of
the contraction for a given contraction ratio, analysis of the turning vanes in
the first elbow, turbulence management system, and overall headloss
estimations. The entire effort was a "paper" study, and consisted of
mathematical modeling and other analysis based on previous studies and
available data. The results have been reported earlier [1].
As a result of the above mentioned work, it was recommended that
additional work be carried out to verify the performance of the preliminary
design. The overall configuration of the HYKA T that was to be evaluated is
Hhown in Fig. 1. This configuration is slightly different than that originally
proposed. The second elbow has been changed from a round to square
cross-section, and the number of turning vanes in the elbows has been
increased. The study was to include both physical and mathematical
modeling. The math modeling was to be verified by the physical model so
that it could then be used to predict the performance of the full-scale
IIYKAT. The math model would also be useful in guiding the experimental
programs and possibly be used in defining new boundary shapes, if deemed
necessary. A combination of both types of modeling has proven to be very
effective, particularly with the opportunity for close liaison being available
between the two modeling groups at the Laboratory. The results of these
efforts are discussed in detail in the following sections.Hamburgische Schiffbau-VersuchsantaltSong, Charles C. S.; Wetzel, Joseph M.; Killen, John M.. (1988). Physical and Mathematical Modeling of the HYKAT. Retrieved from the University Digital Conservancy, https://hdl.handle.net/11299/131349
Fast Deterministic Computation of Determinants of Dense Matrices
No full textIn this paper we consider deterministic computation of the exact
determinant of a dense matrix of integers. We present a new
algorithm with worst case complexity ,
where is the dimension of the matrix
and is a bound on the entries in , but with average expected
complexity , assuming some
plausible properties about
the distribution of . We will also describe a practical version
of the algorithm and include timing data to compare this algorithm
with existing ones. Our result does not depend on ``fast'' integer or
matrix techniques
Valid generalisation from approximate interpolation
No full textLet H and C be sets of functions from domain X to R. We say that H validly generalises C from approximate interpolation if and only if for each j ? 0 and ffl; ffi 2 (0; 1) there is m 0 (j; ffl; ffi) such that for any function t 2 C and any probability distribution P on X , if m m 0 then with P m -probability at least 1 \Gamma ffi, a sample x = (x 1 ; x 2 ; : : : ; xm ) 2 X m satisfies 8h 2 H; jh(x i ) \Gamma t(x i )j ! j; (1 i m) =) P(fx : jh(x) \Gamma t(x)j jg) ! ffl: We find conditions that are necessary and sufficient for H to validly generalise C from approximate interpolation, and we obtain bounds on the sample length m 0 (j; ffl; ffi) in terms of various parameters describing the expressive power of H. 1 Introduction and Definitions Much work has recently been carried out on probabilistic models of machine learning such as the `probably approximately correct' (or pac) model due to Valiant [26]. In particular, the pac learning of f0; 1g-valued functions (equivalent..
Nobel Laureate Anthony J Leggett: A scientometric portrait
No full textThis paper attempts to analyse the publication productivity of Anthony J. Leggett, the 2003 Nobel Prize winner in physics. His contributions peaked in 1987, 1994, and 1998 with 10 papers each. He had 194 publications during 1964 - 2004 in domains like Superfluid 3He (65), Foundations of Quantum Mechanics (36), Dissipative Quantum Systems (24), Atomic Alkali Gases (18), and Miscellaneous (51)which were analysed for authorship pattern with his 70 collaborators. Most active collaborators with Anthony J Leggett were: A. Garg with six papers and A. O. MCaldeira, D. M. Ginsberg, D. J. Vanharlingen , F. Sols, S.Takagi and D. A. Wollman with five papers each. His productivity coefficient was 0.60 which clearly indicates that his productivity
increased after 50 percentile age. The highest degree of collaboration (1) for Anthony J. Leggett was found during 1964, 1971 and 1983. Journals have been the most preferred channel of communication, where as many as 139 papers out of 194 have been published. The core journals publishing his papers were: Phys. Rev. Leu. (42), Phys. Rev. B (9), J. Low Temp. Phys. (8),Phys. Rev. A (7), Ann. Phys. (6), Foundations of physics (6), J. Phys.(5), Prog. Theor: Phys. (5), and Rev. Mod. Phys. (5).Publication density was 3.02 and publication concentration was 3.59
Body dysmorphic disorder and orthodontics--an overview for clinicians
No full textINTRODUCTION: Patients with body dysmorphic disorder (BDD) often seek aesthetic medical treatment including orthodontics to correct their perceived physical defects. When the disorder pertains to the dentofacial region, it is important for orthodontists to be familiar with this condition.OBJECTIVE: The purpose of this article is to provide an overview of the current knowledge on BDD and its relationship to orthodontics.METHOD: PubMed, Scopus, Science Direct, and Google Scholar databases were searched for publications relating to BDD and orthodontics. Further articles were sourced from the reference lists of the articles identified through the search.RESULTS: The literature recommends that orthodontic patients suspected of having BDD should be referred to a psychiatrist for a definitive diagnosis and subsequent management. However, this may be difficult to implement in clinical practice. Management by a psychiatrist could include pharmacotherapy and cognitive behavioural therapy. There is still debate as to whether orthodontic treatment should be provided for these patients.CONCLUSION: As health care workers providing aesthetic treatment to patients, orthodontists should be aware of BDD and its implications. Risks include repeated requests for unnecessary treatment, dissatisfaction with the result and thus potential for litigation. BDD still remains a challenge to diagnose, and further research is needed to determine the appropriate management of orthodontic patients suffering from the disorder
Phase A-2, Large Cavitation Channel, David Taylor Naval Ship Reasearch And Development Center
No full textThe Large Cavitation Channel (LCC) has very tight performance
specifications for the flow quality in the test section, both for uniformity of
the mean velocity profiles and turbulence levels. The mean velocity profiles
have been addressed experimentally in the Task A report, and mathematically in
the Task B report. This task is concerned with the turbulence levels in the
test section. Turbulence levels are partially controlled bY,honeycomb design.
Model studies of honeycombs should be conducted at as high a Reynolds number as
possible to reduce scale effects. Thus, the decision was made not to utilize
the undistorted 1 to 10 scale model of the preliminary Kempf and Remmers (K&R)
contraction, test section, and diffuser that was used in the Task A studies as
the Reynolds number based on honeycomb parameters was judged to be too low to
obtain meaningful results. The existing wind tunnnel facility was modified for
the turbulence measurements in rather an unique manner so that full scale
honeycombs could be evaluated. These modifications were made after the tests of
the Task A program were completed. Results of the turbulence measurements and
recommendations for a turbulence management system for the LCC are discussed in
the following sections.SSV&K/DMJM:Joint VentureWetzel, Joseph M.; Bintz, David W.; Arndt, Roger E. A.; Morel, T.; Sharadchandra, Gavali; Song, Charles C. S.; Killen, John M.. (1983). Phase A-2, Large Cavitation Channel, David Taylor Naval Ship Reasearch And Development Center. Retrieved from the University Digital Conservancy, https://hdl.handle.net/11299/131499
Settling of finite-size particles in isotropically forced, homogeneous turbulence: interface-resolved simulations
No full textWe have simulated the gravity-induced settling of finite-size particles in a turbulent background flow which is forced in a statistically-stationary fashion. The simulations are accurately resolving the solid-fluid interface with the aid of an immersed boundary technique [1]. The parameters of the simulation are (apart from background turbulence) identical to those of reference [2], where particle clustering was observed at a Galileo number of 178 and a solid volume fraction of 0.005. In the present case, it is found that a relative turbulence intensity of 0.24 leads to the disappearance of the clusters; as a consequence, the increase in average particle settling velocity found in [2] also vanishes. [1] M. Uhlmann. An immersed boundary method with direct forcing for the simulation of particulate flows. J. Comput. Phys., 209(2):448–476, 2005. [2] M. Uhlmann and T. Doychev. Sedimentation of a dilute suspension of rigid spheres at intermediate Galileo numbers: the effect of clustering upon the particle motion. J. Fluid Mech., 752:310–348, 2014
Mesophilic-hydrothermal-thermophilic (M-H-T) digestion of green corn straw
No full textMesophilic-hydrothermal (80-160 degrees C, 30 min)-thermophilic (M-H-T) digestion and control tests of mesophilic (M), thermophilic (T), hydrothermal-mesophilic (H-M), and mesophilic-thermophilic digestion (M-T) of green corn straw were conducted for a 20-day fermentation period. The results indicate that M-H-T is an efficient method to improve methane production. A maximum methane yield of 371.74 mL/g volatile solid was obtained by the M (3 days)-H (140 degrees C)-T (17 days) process, which was 20.44%, 16.55%, 31.44%, and 14.31% higher than the yields of the M, T, 140-M, and M-T processes. The enhanced methane production was attributed to (1) the improved hemicellulose degradation and lignin disorganization; (2) prevention of the degradation of soluble sugar, easily hydrolyzed hemicellulose and cellulose into furfural and methylfurfural; and (3) lack of formation of Maillard reaction products during initial hydrothermal treatment. (C) 2015 Elsevier Ltd. All rights reserved
How Tight is Hadamard's Bound?
No full textFor a real square matrix , Hadamard's inequality gives an
upper bound for the determinant of . This upper bound is sharp if
and only if the rows of are orthogonal. In this paper we study
how much we can expect that overshoots the determinant of ,
when the rows of are chosen randomly on the surface of the
sphere. This gives an indication of the ``wasted effort'' in some
modular algorithms
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