Results 51 to 60 of about 922,585 (380)
Conditional Hardness for Approximate Coloring
, 2005 We study the coloring problem: Given a graph G, decide whether $c(G) \leq q$ or $c(G) \ge Q$, where c(G) is the chromatic number of G. We derive conditional hardness for this problem for any constant $3 \le q < Q$.
Dinur, Irit +2 more
core +3 more sources
Study on the Sintered Characteristics and Properties of Co-30 mass% Cr Alloys under Various Vacuum Hot-Press Sintering Temperatures and Pressures [PDF]
Archives of Metallurgy and Materials, 2020 In this research, Co-30 mass% Cr alloys were fabricated by a vacuum hot-press sintering process. Different amounts of submicron cobalt and chromium (the mean grain size is 800 and 700 nm, respectively) powders were mixed by ball milling.
Shih-Hsien Chang +2 more
doaj +1 more source
Unifying and Strengthening Hardness for Dynamic Problems via the Online Matrix-Vector Multiplication Conjecture [PDF]
Symposium on the Theory of Computing, 2015 Consider the following Online Boolean Matrix-Vector Multiplication problem: We are given an n x n matrix M and will receive n column-vectors of size n, denoted by v1, ..., vn, one by one.
Monika Henzinger +3 more
semanticscholar +1 more source
A new approach to local hardness
, 2011 The applicability of the local hardness as defined by the derivative of the chemical potential with respect to the electron density is undermined by an essential ambiguity arising from this definition. Further, the local quantity defined in this way does
Ayers +85 more
core +1 more source
A Second Step Towards Complexity-Theoretic Analogs of Rice's Theorem [PDF]
, 1999 Rice's Theorem states that every nontrivial language property of the recursively enumerable sets is undecidable. Borchert and Stephan initiated the search for complexity-theoretic analogs of Rice's Theorem.
Hemaspaandra, Lane A., Rothe, Joerg
core +2 more sources
Materials, 2019 CAD/CAM (computer-aided design/computer-aided manufacturing) for indirect restorative materials has been recently introduced in dentistry. The purpose of this study was to evaluate the change of the surface micro-hardness of different restorative CAD/CAM
Marco Colombo +4 more
semanticscholar +1 more source
The unpredictably eruptive dynamics of spruce budworm populations in eastern Canada
Population Ecology, EarlyView.We examine historical population data for spruce budworm from several locations through the period 1930–1997, and use density‐dependent recruitment curves to test whether the pattern of population growth over time is more consistent with Royama's (1984; Ecological Monographs 54:429–462) linear R(t) model of harmonic oscillation at Green River New ...
Barry J. Cooke, Jacques Régnière
wiley +1 more source
Metalurgija, 2020 AISI 316L is one kind of implant materials due to its excellent mechanical properties and corrosion resistance. However, some of their mechanical and surface properties must be improved to a higher level of cobalt-based alloys and titanium properties ...
P. T. Iswanto +3 more
doaj
Effect of Solution Treatment Process on Hardness of Alumina Reinforced Al-9Zn Composite Produced by Squeeze Casting [PDF]
International Journal on Smart Material and Mechatronics, 2014 Characteristics of aluminium matrix composites reinforced by alumina have been developed to improve mechanical properties. One of the determining factors in the development of this material is parameter of solution treatment process. This study discusses
Dwi Rahmalina +2 more
doaj
Crystals, 2020 The oxidation and hardness of thermally exposed titanium (Ti) prepared using inductive sintering-assisted powder metallurgy was evaluated through cyclic tests in air at 700−900 °C for 100 h (5 cycles). In general, the oxidation kinetics of the
Fahamsyah H. Latief +4 more
doaj +1 more source