Results 91 to 100 of about 103,268 (270)
Medicina, 2010 Introdução: A intoxicação aguda por antidepressivos tricíclicos é comum nas salas de emergência. Anormalidades no eletrocardiograma de 12 derivações (ECG) são associadas a este tipo de intoxicação, com implicações diagnósticas e prognósticas.
Carlos H. Miranda +3 more
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On a conjecture about tricyclic graphs with maximal energy [PDF]
MATCH Commun. Math. Comput. Chem. 72(1)(2014), 183--214, 2013 For a given simple graph $G$, the energy of $G$, denoted by $\mathcal {E}(G)$, is defined as the sum of the absolute values of all eigenvalues of its adjacency matrix, which was defined by I. Gutman. The problem on determining the maximal energy tends to be complicated for a given class of graphs.
arxiv
On a conjecture for the signless Laplacian eigenvalues [PDF]
arXiv, 2013 Let $G$ be a simple graph with $n$ vertices and $e(G)$ edges, and $q_1(G)\geq q_2(G)\geq\cdots\geq q_n(G)\geq0$ be the signless Laplacian eigenvalues of $G.$ Let $S_k^+(G)=\sum_{i=1}^{k}q_i(G),$ where $k=1, 2, \ldots, n.$ F. Ashraf et al. conjectured that $S_k^+(G)\leq e(G)+\binom{k+1}{2}$ for $k=1, 2, \ldots, n.$ In this paper, we give various upper ...
arxiv
Performance optimization of a finite-time quantum tricycle [PDF]
arXivWe establish a finite-time external field-driven quantum tricycle model. Within the framework of slow driving perturbation, the perturbation expansion of heat in powers of time can be derived during the heat exchange processes. Employing the method of Lagrange multiplier, we optimize the cooling performance of the tricycle by considering the cooling ...
arxiv
Properties of stepwise irregular graphs [PDF]
arXiv, 2018 Stepwise irregular (SI) graphs were introduced by Ivan Gutman recently in 2018 and in these graphs the difference between the degrees of any two adjacent vertices is exactly one. In this work, we show the existence of connected bicyclic SI graphs of order 5 and 9 which has been claimed to be non-existent by Gutman.
arxiv
Further Evidence for a S-Syn Correlation in the Purine(β)ribosides: The Solution Conformation of Two Tricyclic Analogs of Adenosine and Guanosine [PDF]
, 1979 G. Klimke +2 more
openalex +1 more source
Resolvent Energy of Unicyclic, Bicyclic and Tricyclic Graphs [PDF]
arXiv, 2015 The resolvent energy of a graph $G$ of order $n$ is defined as $ER=\sum_{i=1}^n (n-\lambda_i)^{-1}$, where $\lambda_1,\lambda_2,\ldots,\lambda_n$ are the eigenvalues of $G$. In a recent work [Gutman et al., {\it MATCH Commun. Math. Comput. Chem.\/} {\bf 75} (2016) 279--290] the structure of the graphs extremal w.r.t.
arxiv
Approach to the Core Structure of Signermycin B
ChemistryOpenAmong the natural tetramic acids with a decalinoyl part, signermycin B is unique because it contains a cis‐decalin. In this paper, we demonstrate that the cis‐decalin section of signermycin B can be accessed by an anionic oxy‐Cope rearrangement.
Dr. Khoa Linh Pham +1 more
doaj +1 more source
Rearrangement of o-Nitrobenzaldehyde in the Hantzsch Reaction
Molecules, 2001 The reaction of 5-hydroxy-2-nitrobenzaldehyde with ethyl acetoacetate in ammonia gave the two expected isomeric 1,4- and 1,2-dihydropyridines resulting from the normal Hantzsch reaction.
R. MartÃÂnez +7 more
doaj +1 more source
Notizen: Konkurrenzreaktionen einiger tricyclischer Diene zur [2+2]PhotocycIoaddition / Competitive Reaction of Some Tricyclic Dienes to [2+2]Photocycloaddition [PDF]
, 1979 Harun Parlar
openalex +1 more source