Results 121 to 130 of about 776,655 (324)

Strong equality of Roman and weak Roman domination in trees

Discrete Applied Mathematics, 2016
We provide a constructive characterization of the trees for which the Roman domination number strongly equals the weak Roman domination number, that is, for which every weak Roman dominating function of minimum weight is a Roman dominating function.
Simone Dantas, José D. Alvarado, Dieter Rautenbach   +2 more
openaire   +3 more sources

Female Directors, Family Firms, Climate Talk and Climate Walk: European Evidence

Business Strategy and the Environment, EarlyView.
ABSTRACT Growing attention is attributed to symbolic and substantive climate efforts, labelled as climate talk and walk. Focusing on the European capital market, we study the relationship between board gender diversity, family ownership and different levels of corporate climate activities along the continuum from climate talk to climate walk.
Niklas Bergmann, Patrick Velte, Ignacio Requejo   +2 more
wiley   +1 more source

Controlling the Morphology and Electrochemical Properties of Electrodeposited Nickel Hexacyanoferrate

ChemElectroChem, EarlyView.
Prussian blue analogs (PBAs) offer tunable properties for diverse applications. While coprecipitation synthesis is well‐studied, electrochemical deposition remains underexplored. This study examines how temperature, scan rate, precursor concentration, and pH affect electrodeposited nickel hexacyanoferrate, revealing their impact on crystallinity ...
Tim Steeger, Raphael L. Streng, Anatoliy Senyshyn, Vadim Dyadkin, Xaver Lamprecht, Roman List, Aliaksandr S. Bandarenka   +6 more
wiley   +1 more source

Influence of Compactness and Crystallinity on Hole Transfer Ability of Nickel Oxide Layer in Modal Coupling Regime

Chemistry – A European Journal, EarlyView.
This study investigates how structural properties influence the hole migration behavior of nickel oxide (NiOx). Our findings reveal that both crystallinity and compactness significantly affect the hole transport capability of NiOx layers. The Au‐NPs/NiOx/Pt‐film photocathode exhibited cathodic photocurrent at wavelengths below 800 nm, with a maximum ...
Tomoya Oshikiri, Takashi Katsurahara, Noriko Kubota, Takahiro Tezuka, Kai Araki, Xu Shi, Yasutaka Matsuo, Hiromasa Niinomi, Hiroaki Misawa, Masaru Nakagawa   +9 more
wiley   +1 more source

Signed double Roman domination in graphs

Discrete Applied Mathematics, 2019
In this paper we continue the study of signed double Roman dominating functions in graphs. A signed double Roman dominating function (SDRDF) on a graph G = (V,E) is a function f : V(G)  {-1,1,2,3} having the property that for each v  V(G), f [v] ≥ 1, and if f (v)= -1, then vertex v has at least two neighbors assigned 2 under f or one ...
Hossein Abdollahzadeh Ahangar, Mustapha Chellali, Seyed Mahmoud Sheikholeslami   +2 more
openaire   +3 more sources

Towards Systemic Leadership Resilience: Proposing the Hybrid Artificial Intelligent Leader in Response to Economic Crises

Canadian Journal of Administrative Sciences / Revue Canadienne des Sciences de l'Administration, EarlyView.
ABSTRACT Researchers now understand that the Great Recession stemmed from a “systemic leadership failure,” involving various entities such as the government, financial institutions, investors, homeowners, and regulators. Consequently, traditional leadership approaches of the time came under intense scrutiny, necessitating a shift in leadership ...
Faidon Theofanidis, Eleni Tsianaka, Christos Livas   +2 more
wiley   +1 more source

Independent double Roman domination in graphs

AKCE International Journal of Graphs and Combinatorics, 2020
For a graph G = (V,E), a double Roman dominating function has the property that for every vertex with f(v) = 0, either there exists a vertex , with f(u) = 3, or at least two neighbors having f(x) = f(y) = 2, and every vertex with value 1 under f has at ...
H. R. Maimani, M. Momeni, F. Rahimi Mahid, S. M. Sheikholeslami   +3 more
doaj   +1 more source

Archaeometric Analyses of Medieval Pottery From the Lower Danube Region, Romania

ChemPlusChem, Accepted Article.
This paper discusses the pottery manufacturing in the Lower Danube region during the Early Medieval period. Optical Microscopy (OM), Particle Induced X‐ray Emission (PIXE) and X‐ray Diffraction (XRD) were performed on thirty‐two ceramic shards unearthed at Pantelimonu de Sus, Romania, dated to the 8th‐10th c. AD. The petrographic observations showed an
Roxana Bugoi, Constantin Haitǎ, Cristina Talmaţchi, Ana-Maria Banici   +3 more
wiley   +1 more source

Domination parameters with number 2: interrelations and algorithmic consequences

, 2016
In this paper, we study the most basic domination invariants in graphs, in which number 2 is intrinsic part of their definitions. We classify them upon three criteria, two of which give the following previously studied invariants: the weak $2$-domination
Bonomo, Flavia, Bresar, Bostjan, Grippo, Luciano N., Milanic, Martin, Safe, Martin D.   +4 more
core  

Colors from the Past: Ion Beam Analyses on Glass Finds Excavated at the Late Iron Age Settlement from Tinosu, Prahova County, Romania

ChemPlusChem, EarlyView.
Particle induced X‐ray emission‐Particle induced gamma‐ray emission analyses of 20 glass fragments from monochrome or millefiori vessels and adornments from the Late Iron Age site from Tinosu, Romania (1st c. BC and 1st c. AD) indicates compositions similar to coeval Hellenistic and Roman glass finds , suggestive for imports.
Roxana Bugoi, Despina Măgureanu, Mariana‐Cristina Popescu, Kristina Isaković, Žiga Šmit   +4 more
wiley   +1 more source