Results 31 to 40 of about 10,716 (231)

Walking Cautiously Into the Collatz Wilderness: Algorithmically, Number Theoretically, Randomly [PDF]

Discrete Mathematics & Theoretical Computer Science, 2006
Building on theoretical insights and rich experimental data of our preprints, we present here new theoretical and experimental results in three interrelated approaches to the Collatz problem and its generalizations: \emphalgorithmic decidability, random ...
Edward G. Belaga, Maurice Mignotte
doaj   +1 more source

A linear-time algorithm that avoids inverses and computes Jackknife (leave-one-out) products like convolutions or other operators in commutative semigroups

Algorithms for Molecular Biology, 2020
Background Data about herpesvirus microRNA motifs on human circular RNAs suggested the following statistical question. Consider independent random counts, not necessarily identically distributed.
John L. Spouge, Joseph M. Ziegelbauer, Mileidy Gonzalez   +2 more
doaj   +1 more source

Current status of multilayer neutron interferometry with gaseous samples at J-PARC. [PDF]

J Appl Crystallogr
First measurements of the neutron scattering lengths of 3He and 4He using a multilayer‐type neutron interferometer at J‐PARC are reported, demonstrating the initial feasibility of the method with prospects for improved precision.Several few‐body nuclear models, such as the Argonne v18 potential including three‐nucleon forces and chiral effective field ...
Nambu T, Auton CJ, Fujiie T, Hino M, Hosobata T, Ichikawa G, Kitaguchi M, McElhannon AL, Mishima K, Seki Y, Shimizu HM, Snow WM, Yamagata Y.   +12 more
europepmc   +2 more sources

Enantioselective Synthesis of a New Class of Stable and Functionalized Cyclopentadienes via CuH‐Catalysis

Angewandte Chemie, EarlyView.
Cyclopentadienes (CpHs) are fundamental building blocks with widespread applications in chemistry. However, their inherent acidity and isomeric instability have long limited access to chiral variants in an asymmetric fashion. Here, we introduce a CuH‐catalyzed asymmetric transformation that provides an unprecedented entry into a new class of ...
Piero Soppelsa, Riccardo Bellin, Besma Boulila, Francesco Vaghi, Manuel Orlandi   +4 more
wiley   +2 more sources

Color‐Pure Organic Luminophores: Characteristics, Definitions, Physical Basis and Fundamental Design Principles

Angewandte Chemie, EarlyView.
Color‐pure all‐organic emitters, i.e., with narrow spectral characteristics, are intensively studied for high‐definition organic LEDs and multi‐color bioimaging. In order to guide targeted materials design, this educative review discusses spectral characteristics, proper definitions and units, and the physical basis of spectral broadening, to distill ...
Johannes Gierschner, Sunwu Song, Siyang Feng, Liangxuan Wang, Miguel Ródenas, Begoña Milián‐Medina, Min Sang Kwon   +6 more
wiley   +2 more sources

Study on the rearrangeability of 3n-1 stages shuffle-exchange network

Tongxin xuebao, 2011
Rearrangeability is an essential issue in study of SE（shuffle-exchange） network and its application.Currently,there are no practical methods to realize rearrangeability of SE networks when n>4.Based on the fact,a policy to realize the rearrangeability ...
GE Fang-bin1, ZHANG Tao1, SONG Jin-yu1, ZHAO Min1, CHEN Wei-hua2   +4 more
doaj   +2 more sources

A Survey of Interlayer Interaction Models for Graphene and Other 2D Materials

Advanced Materials Interfaces, EarlyView.
Van der Waals interactions arising from electronic polarization at atomically close interfaces generate corrugated interlayer energy landscapes that govern normal and tangential tractions. This review presents an overview of quantum, atomistic, analytical, and continuum modeling approaches, highlighting their roles across length scales in capturing ...
Gourav Yadav, Shakti S. Gupta, Roger A. Sauer   +2 more
wiley   +1 more source

Minimum cycle and homology bases of surface-embedded graphs

Journal of Computational Geometry, 2017
We study the problems of finding a minimum cycle basis (a minimum-weight set of cycles that form a basis for the cycle space) and a minimum homology basis (a minimum-weight set of cycles that generates the 1-dimensional $(\mathbb{Z}_2)$-homology classes)
Glencora Borradaile, Erin Wolf Chambers, Kyle Fox, Amir Nayyeri   +3 more
doaj   +1 more source

Characterization of Droplet Formation in Ultrasonic Spray Coating: Influence of Ink Formulation Using Phase Doppler Anemometry and Machine Learning

Advanced Materials Technologies, EarlyView.
This study explores how machine learning models, trained on small experimental datasets obtained via Phase Doppler Anemometry (PDA), can accurately predict droplet size (D32) in ultrasonic spray coating (USSC). By capturing the influence of ink complexity (solvent, polymer, nanoparticles), power, and flow rate, the model enables precise droplet control
Pieter Verding, Danny E. P. Vanpoucke, Yunus T. Aksoy, Tobias Corthouts, Maria R. Vetrano, Wim Deferme   +5 more
wiley   +1 more source

On the (3N+1)-conjecture

, 1990
The 3n + 1 conjecture, also known as the Collatz conjecture, is an unsolved conjecture in number theory. The 3n + 1 function T : N+ → N+ is defined as: T (n) = { n/2 if n ≡ 0 (mod 2) (3n + 1)/2 if n ≡ 1 (mod 2) The 3n+1 conjecture says that for any ...
J. Sander
semanticscholar   +1 more source