13,942 research outputs found
Postal de K. Hoffman a Pedro Dorado Montero
No full textPostal de K. Hoffman, en nombre de Hermann Bahr´s Buchhandlung, a D. Pedro Dorado Montero, sobre el abono de sus libros
Singhalocryptus alticola Hoffman 1977
No full textSinghalocryptus alticola Hoffman, 1977 Singhalocryptus alticola Hoffman, 1977: 106, figs 2–8, (OD). Records from Sri Lanka. Piduruthalagala (Hoffman, 1977). Distribution. Only known from Sri Lanka.Published as part of De Zoysa, H. K. S., Nguyen, Anh D. & Wickramasinghe, S., 2016, Annotated checklist of millipedes (Myriapoda: Diplopoda) of Sri Lanka, pp. 451-482 in Zootaxa 4061 (5) on page 470, DOI: 10.11646/zootaxa.4061.5.1, http://zenodo.org/record/27040
Existence of TP(d,k,n)
No full textGiven a square grid of land, which has n rows and n columns. It is required to plant trees on the land so that there are k trees in every row and column and there is at most 1 tree in any small square part of the land with d rows and d columns. What should be the values of n, k and d? How to plant the trees?
The objective of this dissertation is to analyze the problem and come up with the answers to the questions proposed above. The dissertation consists of two main parts. The first part provides necessary and sufficient conditions regarding the values of n, k and d. The second part of the dissertation delivers the method to plant the trees on the land under given constraints
The generic-viewpoint assumption and illusory contours
No full textVisual images are ambiguous. Any image, or collection of images, is consistent with an infinite number of possible scenes in the world. Yet we are generally unaware of this ambiguity. During ordinary perception we are generally aware of only one, or perhaps a few of these possibilities. Human vision evidently exploits certain constraints -- assumptions about the world and images formed of it -- in order to generate its perceptions. One constraint that has been widely studied by researchers in human and machine vision is the generic-viewpoint assumption. We show that this assumption can help to explain the widely discussed fact that outlines of blobs are ineffective inducers of illusory contours. We also present a number of novel effects and report an experiment suggesting that the generic-viewpoint assumption strongly influences illusory-contour perception
Contour completion and relative depth: Petters rule and support ratio
No full textThe ability to see complete objects despite occlusion is critical to humans' visual success. Human vision can amodally complete visual objects that are partially occluded, and modally complete visual objects that occlude other objects. Previous experiments showed that the perceived strength of a completed contour depends on its support ratio: the ratio of the length of the physically specified contour to the total length of the contour. Other experiments showed that human vision prefers to make modal completions as short as possible, an effect known as Petter's rule. The experiment reported here examined the relationship between Petter's rule and support ratio, showing that both affect modal completion in figures of homogeneous color, but that when they compete Petter's rule dominates. Finally, our results confirm that Petter's rule is an effect of relative gap lengths and not of relative size
On the existence of even and k-divisible-matchings
No full textThe concept of an an even matching was first introduced by Billington and Hoffman.
They were used to find gregarious 4-cycle decompositions of with a and b odd.
Their paper contains even matchings of type for ,
even and . This paper considers the necessary and sufficient
conditions for the existence of even matchings as well as k-divisible matchings. We present a construction of even matchings and 3-divisible matchings
of type provided the necessary conditions are satisfied
Faddeev’s equations in differential form: Completeness of physical and spurious solutions and spectral properties
No full textFaddeev type equations are considered in differential form as eigenvalue equations for non‐self‐adjoint channel space (matrix) Hamiltonians HF. For these equations in both the spatially confined and infinite systems, the nature of the spurious (nonphysical) solutions is obvious. Typically, these together with the physical solutions (given extra technical assumptions) generate a regular biorthogonal system for the channel space. This property may be used to provide an explicit functional calculus for the then real eigenvalue scalar spectral HF, to show that ±iHF generate uniformly bounded C0 semigroups and to simply relate HF to self‐adjoint Hamiltonian‐like operators. These results extend to the four‐channel Faddeev type equations where the breakup channel is included explicitly.This article is published as Evans, J. W., and D. K. Hoffman. "Faddeev’s equations in differential form: Completeness of physical and spurious solutions and spectral properties." Journal of Mathematical Physics 22, no. 12 (1981): 2858-2871, doi:10.1063/1.525167. Posted with permission.</p
Measurement of partial widths and search for direct CP violation in D-0 meson decays to K-K+ and pi(-)pi(+)
No full textWe present a measurement of relative partial widths and decay rate CP asymmetries in K-K+ and pi(-)pi(+) decays of D-0 mesons produced in p(p) over bar collisions at root s = 1.96 TeV. We use a sample of 2x10(5) D*+-> D-0 pi(+) (and charge conjugate) decays with the D-0 decaying to K-pi(+), K-K+, and pi(-)pi(+), corresponding to 123 pb(-1) of data collected by the Collider Detector at Fermilab II experiment at the Fermilab Tevatron collider. No significant direct CP violation is observed. We measure Gamma(D-0 -> K-K+)/Gamma(D-0 -> K-pi(+)) = 0.0992 +/- 0.0011 +/- 0.0012, Gamma(D-0 ->pi(-)pi(+))/Gamma(D-0 -> K-pi(+)) = 0.035 94 +/- 0.000 54 +/- 0.000 40, A(CP)(K-K+) = (2.0 +/- 1.2 +/- 0.6)%, and A(CP)(pi(-)pi(+)) = (1.0 +/- 1.3 +/- 0.6)%, where, in all cases, the first uncertainty is statistical and the second is systematic
Exactly solvable irreversible processes on one-dimensional lattices
No full textWe consider the kinetics of a process where the sites of an infinite 1‐D lattice are filled irreversibly and, in general, cooperatively by N‐mers (taking Nconsecutive sites at a time). We extend the previously available exact solutionfor nearest neighbor cooperative effects to range N cooperative effects. Connection with the continuous ‘‘cooperative car parking problem’’ is indicated. Both uniform and periodic lattices, and empty and certain partially filled lattice initial conditions are considered. We also treat monomer ‘‘filling in stages’’ for certain highly autoinhibitory cooperative effects of arbitrary range.This article is published as Wolf, N. O., J. W. Evans, and D. K. Hoffman. "Exactly solvable irreversible processes on one‐dimensional lattices." Journal of mathematical physics 25, no. 8 (1984): 2519-2526, doi:10.1063/1.526435. Posted with permission.</p
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