Results 11 to 20 of about 2,923 (151)

Driving the Emission Towards Blue by Controlling the HOMO-LUMO Energy Gap in BF₂ -Functionalized 2-(Imidazo[1,5-a]pyridin-3-yl)phenols. [PDF]

Chemistry, 2021
Blue emissive materials: boron containing fluorescent compounds have been prepared starting from imidazo[1,5‐a]pyridine phenols. Large Stokes shift, high absolute quantum yields and good photostability are observed in solution. TD‐DFT calculations allowed to find a linear correlation between the HOMO‐LUMO energy gap of these compounds and the Hammett ...
Colombo G, Attilio Ardizzoia G, Furrer J, Therrien B, Brenna S.   +4 more
europepmc   +2 more sources

Tetraaza[7]-[15]helicenes Synthesized by Two-Step Strategy: Length-Controlled Chiral π-Systems Exhibiting Amplified Circularly Polarized Luminescence. [PDF]

Angew Chem Int Ed Engl
A modular two‐step strategy provides tetraaza[n]helicenes (n = 7–15) as a homologous series with tunable photophysical and chiroptical properties. Extension beyond n = 11 induces pronounced through‐space π–π interactions, narrowing the energy gap and amplifying circularly polarized luminescence.
Otani T, Wu Y, Ueda K, Ikeda Y, Tada Y, Kinoshita N, Shibata T.   +6 more
europepmc   +3 more sources

Tunable Doping of Rhenium and Vanadium into Transition Metal Dichalcogenides for Two-Dimensional Electronics. [PDF]

Adv Sci (Weinh), 2021
A chemical vapor deposition method using mixed molten salts is established for vapor–liquid–solid growth of Re‐ and V‐doped transition metal dichalcogenide (TMDC) monolayers. Tunable semiconductor to metal transition is observed in the as‐grown Re‐ and V‐doped TMDC monolayers. Using heavily V‐doped WSe2 as van der Waals contact, the performance of WSe2‐
Li S, Hong J, Gao B, Lin YC, Lim HE, Lu X, Wu J, Liu S, Tateyama Y, Sakuma Y, Tsukagoshi K, Suenaga K, Taniguchi T.   +12 more
europepmc   +2 more sources

Fusobacterium nucleatum promotes epithelial-mesenchymal transiton through regulation of the lncRNA MIR4435-2HG/miR-296-5p/Akt2/SNAI1 signaling pathway. [PDF]

FEBS J, 2020
Fusobacterium nucleatum is an anaerobic oral opportunistic pathogen; its precise role in inducing epithelial–mesenchymal transition (EMT) has not been clarified. Here, we reported that F. nucleatum upregulated the expression of MIR4435‐2HG, which could specifically bind with miR‐296‐5p, weakening its ability to silence Akt2.
Zhang S, Li C, Liu J, Geng F, Shi X, Li Q, Lu Z, Pan Y.   +7 more
europepmc   +2 more sources

Light-amplification-assisted sum-frequency generation in erbium-doped thin-film lithium niobate optical waveguides. [PDF]

Nanophotonics
Abstract Erbium‐doped thin‐film lithium niobate (Er3+:TFLN) enables integrated photonic devices through its efficient photoluminescence. However, the fixed transition energies of erbium ions intrinsically restrict emission to the telecommunications C‐band (1530–1565 nm), limiting spectral versatility.
Liu Y, Hao Z, Wu X, Kang S, Ma R, Zhang Y, Liu H, Zheng D, Kong Y, Bo F, Zhang G, Xu J.   +11 more
europepmc   +2 more sources

Impact of Ti and Zn Dual‐Substitution in P2 Type Na2/3Ni1/3Mn2/3O2 on Ni–Mn and Na‐Vacancy Ordering and Electrochemical Properties

Advanced Materials, Volume 35, Issue 26, June 28, 2023., 2023
Dual‐substitution by Ti and Zn for Mn and Ni, respectively, in P2 type Na2/3Ni1/3Mn2/3O2 maintains in‐plane Ni–Mn ordering but disrupts Na+‐vacancy ordering, resulting in long‐cycling‐life non‐aqueous Na cells with smooth charge–discharge voltage curves and little structural change from the P2‐type layered structure. Abstract High‐entropy layered oxide
Kei Kubota, Takuya Asari, Shinichi Komaba   +2 more
wiley   +1 more source

Multistate models as a framework for estimand specification in clinical trials of complex processes

Statistics in Medicine, Volume 42, Issue 9, Page 1368-1397, 30 April 2023., 2023
Intensity‐based multistate models provide a useful framework for characterizing disease processes, the introduction of interventions, loss to followup, and other complications arising in the conduct of randomized trials studying complex life history processes.
Alexandra Bühler, Richard J. Cook, Jerald F. Lawless   +2 more
wiley   +1 more source

Formal  Model and Analysis for the Random Event in the Intelligent Car with Stochastic Petri Nets and Z

Security and Communication Networks, Volume 2022, Issue 1, 2022., 2022
With the continuous development of science and technology, people’s lifestyle becomes more and more intelligent, especially in intelligent transportation. However, running in a random environment, safety can be affected by various factors during operation.
Yang Liu, Yingqi Fan, Darong Huang, Bo Mi, Liyuan Huang, Chen Chen   +5 more
wiley   +1 more source

Understanding the “Molten Salt” Synthesis of MAPbI3 – Characterization of New Lead(II)‐Ammine Complexes as Intermediates

European Journal of Inorganic Chemistry, Volume 2021, Issue 15, Page 1490-1497, April 22, 2021., 2021
Two intermediates, [Pb(CH3NH2)6]I2 and Pb(CH3NH2)4I2, were isolated from the reaction of gaseous CH3NH2 with black MAPbI3, where CH3NH2 acts as a sigma donor ligand to Pb2+. The release of CH3NH2 yields pristine MAPbI3 and PbI2, respectively. Traces of water during this “molten salt approach” reveal Pb(OH)I and the new compound (CH3NH3)5(CH3NH2)2Pb2I9 ...
Michael Daub, Harald Hillebrecht
wiley   +1 more source

Transition Path Sampling as Markov Chain Monte Carlo of Trajectories: Recent Algorithms, Software, Applications, and Future Outlook

Advanced Theory and Simulations, Volume 4, Issue 4, April 2021., 2021
Essentially a Markov Chain Monte Carlo algorithm in trajectory space, transition path sampling can explore molecular dynamics of complex rare event processes. This review discusses several recent path sampling algorithms that are developed by exploiting the analogy between sampling in trajectory space and in configuration space.
Peter G. Bolhuis, David W. H. Swenson
wiley   +1 more source