Results 71 to 80 of about 14,319 (293)

Opium trade and use during the Late Bronze Age: Organic residue analysis of ceramic vessels from the burials of Tel Yehud, Israel

Archaeometry, EarlyView., 2022
Abstract Organic residue analysis was conducted on various vessels from burials at Tel Yehud, Israel. The analyses led to new reliable evidence for the presence of opioid alkaloids and their decomposition products. This research revitalizes a decades‐old discussion on the presence and function of the opium trade across a cultural region of utmost ...
Vanessa Linares, Eriola Jakoel, Ron Be’eri, Oded Lipschits, Ronny Neumann, Yuval Gadot   +5 more
wiley   +1 more source

Existence and Nonexistence of Positive Solutions for Fractional Boundary Value Problems with Lidstone-Inspired Fractional Conditions

Mathematics
This paper investigates the existence and nonexistence of positive solutions for a class of nonlinear Riemann–Liouville fractional boundary value problems of order α+2n, where α∈(m−1,m] with m≥3 and m,n∈N. The conjugate fractional boundary conditions are
Jeffrey W. Lyons, Jeffrey T. Neugebauer, Aaron G. Wingo   +2 more
doaj   +1 more source

The nonexistence of a [[13,5,4]]-quantum stabilizer code

, 2011
One of the oldest problems in the theory of quantum stabilizer codes is solved by proving the nonexistence of quantum [[13,5,4]]-codes.
Fernanda Pambianco, Bierbrauer, Jürgen, Fears, Richard, Stefano Marcugini, Jürgen Bierbrauer, Marcugini, Stefano, Richard Fears, Pambianco, Fernanda   +7 more
core   +1 more source

Existence and uniqueness of positive solutions to a quasilinear elliptic problem in $R^N$

Electronic Journal of Differential Equations, 2005
We prove the existence of a unique positive solution to the problem $$ -Delta _{p}u=a(x)f(u) $$ in $mathbb{R}^{N}$, $N>2$. Our result extended previous works by Cirstea-Radulescu and Dinu, while the proofs are based on two theorems on bounded ...
Dragos-Patru Covei
doaj  

Metal Accumulation, Liver Histopathology, and Human Health Risk Assessment Across Different Trophic Guilds in a Mining‐Affected Neotropical River

Journal of Applied Toxicology, EarlyView.
ABSTRACT Metal pollution in aquatic environments represents a recurring global concern; however, traditional paradigms often assume linear bioaccumulation patterns that may fail under catastrophic contamination scenarios. This study evaluated metal concentrations in water, sediment, and tissues of 10 fish species from different trophic guilds in the ...
Breno Thuller, Alessandro Loureiro Paschoalini, Fabio Pereira Arantes, Cristiano Schetini de Azevedo, Elizete Rizzo, Nilo Bazzoli   +5 more
wiley   +1 more source

Exact Values and Bounds on Covering Schemes of Strength Two

Journal of Combinatorial Designs, EarlyView.
ABSTRACT In this work, we investigate covering schemes of strength 2 over finite abelian groups, establishing new lower and upper bounds and evaluating new exact values. A main result is a new general lower bound that improves the trivial one and achieves optimality for the binary case. We also develop a recursive relation based on subsets of the group
André G. Castoldi, Anderson N. Martinhão, Emerson L. Monte Carmelo, Pablo H. Perondi, Otávio J. N. T. N. dos Santos   +4 more
wiley   +1 more source

Nonexistence of positive radial solutions for a problem with singular potential

Advances in Nonlinear Analysis, 2014
This article completes the picture in the study of positive radial solutions in the function space 𝒟1,2(ℝN)∩L2(ℝN,|x|-αdx)∩Lp(ℝN)${{\mathcal {D}^{1,2}({\mathbb {R}^N}) \cap L^2({{\mathbb {R}^N}, | x |^{-\alpha } dx})\cap L^p({\mathbb {R}^N})}}$ for the ...
Catrina Florin
doaj   +1 more source

Classifying Equidistant Permutation Codes

Journal of Combinatorial Designs, EarlyView.
ABSTRACT A permutation code of length n $n$ is a set of codewords, each of which contains every symbol of a set of size n $n$ exactly once. A permutation code in which any two distinct codewords differ in the same number of coordinates is called equidistant and that number is called the distance.
Patric R. J. Östergård, Luka T. Tolonen   +1 more
wiley   +1 more source

New results on nonexistence of generalized bent functions [PDF]

, 2012
We get two kinds of new results on nonexistence of generalized bent function. The first one is Based on Feng\u27s results by using Schmidt\u27s field descent method. For the second kind, considering special property of the field $\mathbb{Q}(\zeta_{23^e})$
Yingpu Deng, Yupeng Jiang
core   +1 more source

Nonexistence of solutions for quasilinear elliptic equations with p-growth in the gradient

Electronic Journal of Differential Equations, 2002
We study the nonexistence of weak solutions in $W^{1,p}_{{ m loc}}(Omega)$ for a class of quasilinear elliptic boundary-value problems with natural growth in the gradient.
Darko Zubrinic
doaj