273,149 research outputs found
Encounter of lithodid crab Paralomis birsteini on the continental slope off Antarctica, sampled by ROV
No full textA population of stone crab (Lithodidae) was encountered on the continental slope off Antarctica in the Bellingshausen Sea between 1123m and 1304m water depths using the ROV-Isis during leg 166 of the RV James Clark Ross, in January 2007. Specimens were video recorded and one specimen was retrieved by ROV for morphological and molecular identification. Based on morphology and molecular data from the mitochondrial COI gene, this specimen identified as P. birsteini, Macpherson, 1988. The significance of the molecular data and their implications for biogeography and evolution of lithodids in the Southern Ocean are briefly discussed
Minimum Mean Cycle Instances
No full textThis data set contains some large real-world instances of the minimum mean cycle problem.
They are reported as the bonn01 to bonn09 instances in the paper:
Georgiadis, L., Goldberg, A. V., Tarjan, R. E., & Werneck, R. F.
"An experimental study of minimum mean cycle algorithms",
in 2009 Proceedings of the Eleventh Workshop on Algorithm Engineering and Experiments (ALENEX), pp. 1–13,
SIAM.
The instances arise in clock skew scheduling in chip design, e.g. see
Held, S., Korte, B., Rautenbach, D. and Vygen, J.
"Combinatorial optimization in VLSI design. Combinatorial Optimization",
in Combinatorial Optimization, NATO Science for Peace and Security Series - D: Information and Communication Security, pp. 33–96, 2011.
The clock skew scheduling problem in chip design is, given a directed graph G with edge delays d:E(G)-> R,
find a minimum cycle time T and arrival times (a schedule) a: V(G) -> R such that
a(v) + d(v,w) <= a(w) + T for all (v,w) in E(G).
G is called a latch graph. The nodes represent latches and registers, and the edges represent the longest signal paths between registers.
The problem of minimizing T is equivalent to maximizing the worst slack min{s(v,w) := a(w) + T - a(v) - d(v,w) | (v,w) in E(G)} for a fixed cycle time T.
The instances provided in the tar file below consist of directed graphs with edge costs c(v,w) = T - d(v,w),
i.e. edge slacks w.r.t. a zero-skew schedule where a = 0.
The maximum achievable worst slack by varying the schedule 'a' equals the value of a minimum mean cycle in (G,c).
Instance sizes range from 70346 nodes and 898220 edges to 1065274 nodes and 104340248 edges.
Other instances are very dense, e.g. 5361 nodes and 4169878 edges.
Note that the instances may not be strongly connected or even connected.
Format: Ignore empty lines and lines starting with '#', then:
1st line: number_of_nodes number_of_edges
next lines: from_node to_node edge_cost (i.e., zero skew slack
Going Beyond Counting First Authors in Author Co-citation Analysis
No full textThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Kinks in the Electronic Specific Heat
No full textWe find that the heat capacity of a strongly correlated metal presents striking changes with respect to Landau Fermi-liquid theory. In contrast with normal metals, where the electronic specific heat is linear at low temperature (with a T(3) term as a leading correction), a dynamical mean-field study of the correlated Hubbard model reveals a clear kink in the temperature dependence, marking a rapid change from a low-temperature linear behavior and a second linear regime with a reduced slope. Experiments on LiV(2)O(4) support our findings, implying that correlated materials are more resistive to cooling at low T than expected from the intermediate temperature behavior
Mitomycin C in highly myopic eyes - Author reply
No full textOphthalmology. 2005 Feb;112(2):208-18; discussion 219.
Mitomycin C modulation of corneal wound healing after photorefractive keratectomy in highly myopic eyes.
Gambato C, Ghirlando A, Moretto E, Busato F, Midena E.
SourceRefractive Surgery Service and Antimetabolite Therapy Research Unit, Department of Ophthalmology, University of Padova, Padova, Italy.
Abstract
PURPOSE: To evaluate the role of topical mitomycin C in corneal wound healing (CWH) after photorefractive keratectomy (PRK) in highly myopic eyes.
DESIGN: Prospective, double-masked, randomized clinical trial.
PARTICIPANTS: Seventy-two eyes of 36 patients affected by high (>7 diopters) myopia.
METHODS: In each patient, one eye was randomly assigned to PRK with intraoperative topical 0.02% mitomycin C application, and the fellow eye was treated with a placebo. Postoperatively, mitomycin C-treated eyes received artificial tears (3 times daily, tapered in 3 months), whereas the fellow eye was treated with fluorometholone sodium 2% and artificial tears (3 times daily, tapered in 3 months).
MAIN OUTCOME MEASURES: Uncorrected visual acuity (UCVA) and best-corrected visual acuity (BCVA), contrast sensitivity, manifest refraction, and biomicroscopy. Contrast sensitivity was determined using the Pelli-Robson chart. Corneal confocal microscopy documented CWH.
RESULTS: Mean follow-up was 18 months (range, 12-36). No side effects or toxic effects were documented. At 12-month follow-up examination, UCVAs (logarithm of the minimum angle of resolution) were 0.4+/-0.48 and 0.5+/-0.53 (P = .03) in mitomycin C-treated eyes and corticosteroid-treated eyes, respectively. At 1 year, corneal haze developed in 20% of corticosteroid-treated eyes, versus 0% of mitomycin C-treated eyes. At 12, 24, and 36 months, corneal confocal microscopy showed activated keratocytes and extracellular matrix significantly more evident in untreated eyes (Ps = 0.004, 0.024, and 0.046, respectively).
CONCLUSION: Topical intraoperative application of 0.02% mitomycin C can reduce haze formation in highly myopic eyes undergoing PRK.
Comment in
Ophthalmology. 2006 Feb;113(2):357; author reply 357-8
Tip your hat to Nellie, don't you see her passing by! [first line of chorus]
No full textstrophic with choruspiano and voiceads on back cover for Chas. W. Held stock198-4Johns Hopkins University, Levy Sheet Music Collection, Box
144, Item 073Words and Music by Geo. C. Edwards
Tip your hat to Nellie, don't you see her passing by! [first line of chorus]
No full textstrophic with choruspiano and voiceads on back cover for Chas. W. Held stock198-4Johns Hopkins University, Levy Sheet Music Collection, Box
144, Item 073Words and Music by Geo. C. Edwards
Chromatic Numbers from Exact Decision Diagrams in Exact Arithmetic
No full textThis dataset contains source code and consoles for computing chromatic numbers
with exact decision diagrams, solving integer programs with exact arithmetic.
The chromatic number of the DIMACS instance r1000.1c could be determined
for the first time.
There are 3 files:
- ddruns_main.zip contains scripts to reproduce the results
- ddruns.tar contains the consoles and SCIP-exact certificates from our exeriments
- ddcolors_flow_extraction.zip contains the C++ source code to compute exact decision diagrams for graph coloring
- …
