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[Display omitted] In addition to the pressurized high-temperature superconductivity, bilayer and trilayer nickelate superconductors La n +1 Ni n O 3 n +1 (n = 2 and 3) exhibit many intriguing properties at ambient pressure, such as orbital-dependent electronic correlation, non-Fermi liquid behavior, and density-wave transitions. Here, using ultrafast reflectivity measurement, we observe a drastic difference between the ultrafast dynamics of the bilayer and trilayer nickelates at ambient pressure. We observe a coherent phonon mode in La 4 Ni 3 O 10 involving the collective vibration of La, Ni, and O atoms, which is absent in La 3 Ni 2 O 7. Temperature-dependent relaxation time diverges near the density-wave transition temperature of La 4 Ni 3 O 10 , while it is inversely proportional to the temperature in La 3 Ni 2 O 7 above ∼150 K, suggesting a non-Fermi liquid behavior of La 3 Ni 2 O 7. Moreover, we estimate the electron–phonon coupling constants to be 0.05–0.07 and 0.12–0.16 for La 3 Ni 2 O 7 and La 4 Ni 3 O 10 , respectively, suggesting a relatively minor role of electron–phonon coupling in the electronic properties of La n +1 Ni n O 3 n +1 at ambient pressure. The relevant microscopic interaction and dynamic information are essential for further studying the interplay between superconductivity and density-wave transitions in nickelate superconductors. [ABSTRACT FROM AUTHOR]

This article addresses both the existence and properties of non-trivial solutions for a system of coupled Ginzburg-Landau equations derived from nematic-superconducting models. Its main goal is to provide a thorough numerical description of the region in the parameter space containing solutions that behave as a mixed (non trivial) nematic-superconducting state along with a rigorous proof for the existence of this region. More precisely, the rigorous approach establishes that the parameter space is divided into two regions with qualitatively different properties, according to the magnitude of the coupling constant: for small values (weak coupling), there is a unique non-trivial solution, and for large values (strong coupling), only trivial solutions exist. In addition, using a shooting method-based numerical approach, the profiles for the nematic and superconducting components of the non trivial solution are given, together with an algorithm computing the transition values representing the boundaries for the weak coupling region: from superconducting to mixed, and from mixed to nematic. Finally, numerical evidence is given for the existence of a third region, related to neither a small nor a strong coupling parameter (medium coupling) for which multiple non trivial solutions exist. • We provide a rigorous model for the nematic-superconducting phenomena. • We rigorously establish the existence of thresholds. • We design algorithms to compute the numerical values of these thresholds. • We give a detailed description of the mixed nematic-superconducting solutions belonging to the weak coupling regime. [ABSTRACT FROM AUTHOR]

Electron–ion coupling is a fundamental process in nonequilibrium Warm Dense Matter. It also plays a central role in governing the states resulting from the interaction of high-intensity ultrafast lasers and free-electron-lasers with matter, an area that is of growing interest. Our inadequate understanding of the process was revealed in 1992 by the discovery of much weaker than expected electron–ion coupling in the nonequilibrium state at a shock front in Si where energy was transferred from hot ions to cold electrons. This necessarily raised questions about the behavior of electron–ion coupling in states with hot electrons and cold ions. It became a new focus of the field with the discovery of apparently constant electron–ion coupling in f s -laser heated Au, prompting a wide range of experimental and theoretical investigations of non-equilibrium warm dense Au as well as Cu for almost two decades. Fueling the pursuit were the findings of both constant and temperature-dependent coupling from subsequent experiments while the results of theoretical models were revealing reduced electron temperature dependence of electron–ion coupling. The goal of this review is to provide a concise historical account of the reported investigations, focussing on the salient characteristics of the experiments and models and how the diverse findings may be reconciled. Surprisingly, with alternative interpretations of some of the experimental results, a consistent behavior of weak electron–ion coupling has now emerged for f s -laser heated Au and Cu for electron temperature up to 20,000 K, corroborated by the evolution of theoretical predictions towards weak coupling. This is a significant progress. It will incentivize new research to gain further understanding of electron–ion coupling in nonequilibrium Warm Dense Matter. [ABSTRACT FROM AUTHOR]

"Allosteric" was first introduced to mean the other site (i.e., a site distinct from the active or orthosteric site), an adjective for "regulation" to imply a regulatory outcome resulting from ligand binding at another site. That original idea outlines a system with two ligand-binding events at two distinct locations on a macromolecule (originally a protein system), which defines a four-state energy cycle. An allosteric energy cycle provides a quantifiable allosteric coupling constant and focuses our attention on the unique properties of the four equilibrated protein complexes that constitute the energy cycle. Because many observed phenomena have been referenced as "allosteric regulation" in the literature, the goal of this work is to use literature examples to explore which systems are and are not consistent with the two-ligand thermodynamic energy cycle-based definition of allosteric regulation. We emphasize the need for consistent language so comparisons can be made among the ever-increasing number of allosteric systems. Building on the mutually exclusive natures of an energy cycle definition of allosteric regulation versus classic two-state models, we conclude our discussion by outlining how the often-proposed Rube-Goldberg-like mechanisms are likely inconsistent with an energy cycle definition of allosteric regulation. [ABSTRACT FROM AUTHOR]

This article aims to numerically compute the magnetic induced flow in the framework of higher order continuum through its implementation using FreeFem++. The flow through a rectangular channel is assumed laminar, incompressible and under constant applied pressure. External magnetic field is applied through the boundary of the channel. To compute the physical response theory of micropolar continuum is taken into consideration and governing dynamics is described in the form of coupled partial differential equations in velocity, induction and microrotation field variables along with associated boundary conditions. Sparse linear system is thus obtained with the application of finite element method. The resulting system is then solved by sparse solver available in unsymmetric multifrontal package (UMFPACK) through FreeFem++. The variational form of the model is presented and implemented in FreeFem++. Pertinent to physical significance different parameters i.e., magnetic Reynolds number, Hartmann number, micropolar coupling constant, micropolar parameter are studied and results are shown through simulations and graphs.It is observed that with an increase in micropolar coupling parameter the magnetic induction as well as the microrotational velocity of particles decreases in the medium. The maximum magnitude of microrotational velocities is observed near walls of the channel. The microrotational spin in the channel flow slows down due to an increase in induced magnetic field. Moreover, it is found that direct solver for the asymmetric sparse linear system arise in this case does not lead to stable solution. This instability in the solution arises when the Hartmann number in simulations increases than a value of 1.5. Therefore, iterative solver based on generalized minimal residual method (GMRES) should be adopted to weed out the instabilities due to fine scale oscillations of translational as well as microrotational motions of the fluid particles in case of large Hartmann number. [ABSTRACT FROM AUTHOR]

This paper explores thermal quantum memory-assisted entropic uncertainty, Bell-non-locality, and entanglement in a two-qubit Heisenberg XXX chain with x -directional Dzyaloshinskii-Moriya (DM) and Kaplan-Shekhtman-Entin-Wohlman-Aharony (KSEA) interactions in thermal equilibrium. We find this crucial that the initial degree of nonlocality and entanglement in the two-qubit state entirely depends upon the temperature, orientation, and strength of the DM and KSEA interaction of the magnetic field. Among many other situations, the magnetic field characterized by DM interaction with minimal temperature, exchange coupling strength, and KSEA interaction is the most reliable for generating and maintaining maximal nonlocality and entanglement while completely suppressing entropic uncertainty. On the other hand, repeated revivals and non-Markovian dynamics have been observed when the magnetic field is characterized by exchange coupling constant, DM and KSEA interaction with a higher temperature limit. Except for temperature-based magnetic fields, we show that maximal entanglement and nonlocality are generated and preserved in the two qubits with zero-order entropic uncertainty, which we believe is a better result than previous studies. [ABSTRACT FROM AUTHOR]

Focusing towards ternary metal hydrides has recently been regarded as a new avenue for research in pressure-dependent high-temperature superconductors, thanks highly to a fairly large number of permutations of alloying metals, even metalloids, with hydrogen. Herein, new phases of Mg − B − H ternary hydrides are predicted from the first-principles evolutionary techniques, as a result of which the corresponding phonon and electronic calculations for the three candidate phases are performed successively to confirm their dynamic stability and the possibility to become conductors. The metallic MgBH 9 undergoes a superconducting phase with a maximum T c of 64 K at 110 GPa, with its spectral function predominantly active around optical modes. The significant increase in cumulative electron-phonon coupling constant is associated with a relatively low cutoff frequency according to the bandwidth function. As for the non-metallic candidate, hydrogen-vacancy diffusion kinetics of the MgB 2 H 8 phase are determined by means of total energy calculations. Stable pathways at varying pressure are reported, suggesting that elevated pressure lowers the activation energy which is presumably due to an optimal level of average nearest H − H(B) inter-fragment distances. [Display omitted] • New stable phases of Mg–B–H under pressure are determined across the ternary convex hull. • MgBH 9 adopts an orthorhombic structure and becomes metallic at pressures up to 110 GPa. • Frequencies around 178–212 K entail significant increase of the spectral function profile of MgBH 9. • Hydrogen-vacancy diffusion kinetics within MgB 2 H 8 are investigated through the context of total energy curves. [ABSTRACT FROM AUTHOR]

In systems comprising three identical particles, the Efimov effect emerges in the unitary limit. This article, utilizing the method of effective field theory along with the effective range expansion (ERE) and low-momentum expansion, reproduces the Efimov effect beyond unitary limit and identical case and applies to DDK system. It also links the high-energy scale with the ultraviolet cutoff in the three-body system. We discuss a method for obtaining exact solutions for the three-body wave function below the threshold of dimer production, that is D and D s 0 ⁎ (2317). It turns out that introducing this scale is a necessary condition for the emergence of DDK three-body bound state. Since without this scale, the wave function would be solved below threshold with arbitrary binding energy, which violates the conditions of unitarity and energy quantization. The calculation involving this scale results in a discrete spectrum below the threshold and restores unitarity, making the effects induced by this scale significant for the formation of DDK bound state. In order to establish this in a complete formalism, the paper further gives an analytical expression for the three-body coupling constant, and compares it to the numerical calculation in DDK system. [ABSTRACT FROM AUTHOR]

The resonant energy transfer mechanism, responsible for the presence of fractal patterns in the velocity diagrams of kink-antikink scattering, is analyzed for a family of two-component scalar field theory models, in which the kink solutions have two shape modes (one longitudinal and one orthogonal to the kink orbit), in addition to the zero mode, and in which energy redistribution can occur among these three discrete modes. We investigate the scattering between wobbling kinks whose orthogonal shape mode is initially excited, examining how the final velocities, amplitudes, and frequencies depend on the initial excitation amplitude. The differences that this model presents with respect to the ϕ 4 model and its novel properties are highlighted. This analysis sheds light on the intricate dynamics that arise from the interplay between multiple degrees of freedom in kink scattering processes, offering insights distinct from those observed in simpler models. • Kink-antikink collisions in a two-component scalar field theory are studied. • The shape mode of the second field component is activated before the collision. • After the scattering process the energy is discharged into all the internal modes. • The energy transfer mechanism depends on the value of the initial wobbling amplitude. • The final wobbling amplitudes depend on the coupling constant of the theory. [ABSTRACT FROM AUTHOR]

[Display omitted] • Superconducting properties of intermetallic Heusler compounds Li 2 CuX and LiCu 2 X (X = Si, Ge, or Sn) have been investigated. • All the studied Heusler compounds are metallic. • Our calculations reveal that Fm -3 m LiCu 2 Ge exhibits the highest T c. • The predicted T c of full Heusler Fm -3 m LiCu 2 Ge is 2.0 K. First-principles computational methods have been employed to explore the electronic, lattice dynamics, and superconducting properties of the intermetallic Heusler compounds Li 2 CuX and LiCu 2 X (X = Si, Ge, or Sn). The electronic structure calculations suggest that all of these compounds exhibit metallic properties. The dynamic stability of the compounds has been examined by computing the phonon dispersion spectra and phonon density of states. Six out of twelve phases are found to be dynamically stable. Additionally, the superconductivity of stable and metastable compounds has been investigated using the electron–phonon-mediated mechanism. In calculations, it turns out that, regular cubic full Heusler Fm -3 m LiCu 2 Ge exhibited the highest superconducting critical temperature (T c) of 2.0 K, with a calculated electron–phonon coupling constant (λ) of 0.58. [ABSTRACT FROM AUTHOR]

The Nambu–Jona-Lasino model is modified by the inclusion of a running-coupling that was obtained by a fractal approach to Quantum Chromodynamics. The coupling follows a q -exponential function and, in the context of high energy collisions, explains the origin of the Tsallis non-extensive statistics distributions. The parameter q is completely determined in terms of the number of colours and the number of quark flavours. We study several aspects of the extended model and compare our results to the standard NJL model, where a constant coupling is used in combination with a sharp cutoff to regularize the gap equation. We show that the modified coupling regularizes the model in a smooth cutoff fashion and reproduces the pion mass and decay constant, providing an almost identical Gell-Mann-Oakes-Renner relation as in the standard NJL model. In both models the relation is satisfied in similar cutoff scales. An important novelty of this work is the physical explanation, in terms of the fractal QCD vacuum, for a running coupling that renormalizes the quark condensate. [ABSTRACT FROM AUTHOR]

This study introduces a new NMR-based methodology for identification (ID) and quantification (purity, strength) assays of widely used amino acids. A detailed analysis of four amino acids and their available salts was performed with both a high-field (600 MHz) and a benchtop (60 MHz) NMR instrument. To assess sensitivity constraints, samples for 1H NMR analysis were initially prepared using only 10 mg of analyte and 1 mg of maleic acid (MA) as an internal calibrant (IC) and secondary chemical shift reference. The characteristic dispersion of the peak patterns indicating the presence or absence of a counterion (mostly chloride) was conserved at both high and low-field strength instruments, showing that the underlying NMR spectroscopic parameters, i.e., chemical shifts and coupling constants, are independent of the magnetic field strength. However, as the verbal descriptions of 1H NMR spectra are challenging in the context of reference materials and pharmaceutical monographs, an alternative method for the identification (ID) of amino acids is proposed that uses 13C NMR patterns from multiplicity-edited HSQC (ed-HSQC), which are both compound-specific and straightforward to document. For ed-HSQC measurements, the sample amount was increased to 30 mg of the analyte and several acquisition parameters were tested, including t 1 increments used in the pulse program, number of scans, and repetition time. Excellent congruence with deviations <0.1 ppm was achieved for the 13C chemical shifts from 1D 13C NMR spectra (150 MHz) vs. those extracted from ed-HSQC (15 MHz traces). Finally, all samples of amino acid candidate reference materials were quantified by 1H qNMR (abs-qHNMR) at both 600 and 60 MHz. At high field, both IC and relative quantitations were performed, however, with the low-field instrument, only the IC method was used. The results showed that the analyzed reference material candidates were generally highly pure compounds. To achieve adequately low levels of uncertainty for such high-purity materials, the sample amounts were increased to 100 mg of analytes and 10 mg of the IC and replicates were analyzed for selected amino acids. [Display omitted] • 1H NMR identifies free amino acids and distinguishes them from their salts. • Indirect 13 C NMR measurement via 2D HSQC can serve as innovative identity assay. • Congruence in IC- and rel-qHNMR is diagnostic for chemical purity and water content. • Sample size and replicates are key for absolute qHNMR or high-purity compounds. • Benchtop NMR is suitable for pharmaceutical identity, quantity, and purity assays. [ABSTRACT FROM AUTHOR]

• Synthesis of 3-allyl-2,6-diarylpiperidin-4-one oximes. • Characterization through IR, GCMS–, NMR (1D and 2D) and DEPT spectra. • Coupling constants and chair confirmations. • Optimization, HOMO-LUMO, MEP, NBO, AIM, polarizabilty and first-order hyperpolarizability were discussed. • Atomic and mulliken charges. • Molecular docking, antibacterial and antifungal activities. A series of novel 3-allyl-2,6-diarylpiperidin-4-one oximes (1–5) have been synthesized and characterized by IR, GC–MS, 1H, 13C NMR, DEPT, 1H1H– COSY, 1H13C– COSY and HMBC spectroscopy. The observed chemical shifts, coupling constant values suggest that all the synthesised compounds 1–5 were adopt normal chair conformation with equatorial orientation of all substitutents. The stable conformation of compound 1 was discussed by theoretically. The computational calculations were predicted by geometry optimization structure, selected geometrical parameters and molecular properties such as NBO, AIM, HOMO-LUMO, MEP surface, dipole moment and atomic Mulliken charges were derived from Gaussian-09 package. The non-linear optical properties were investigated using polarizability and first-order hyperpolarizability for all the synthesized compounds 1–5. The 1H and 13C NMR spectral data were additionally computational compared with the experimental values. The molecular docking studies of hydrogen bonding and co-crystalline interactions were carried out for the molecule. The microbial activity of antibacterial and antifungal activity were derived by disc diffusion method. [Display omitted] [ABSTRACT FROM AUTHOR]

HfO 2 -based mixtures, such as HfO 2 -Al 2 O 3 , play an important role in high-power laser optics and metal oxide semiconductor devices due to their high laser damage resistance and high dielectric constant. However, comprehensive insights into the microstructure and chemical state of HfO 2 -based mixtures at the atomic level are limited, partly because the extremely large fourfold coupling constant of hafnium makes it difficult to characterize. Herein, the Al structures in HfO 2 -Al 2 O 3 mixtures were investigated and compared with that of Al 2 O 3 using solid-state nuclear magnetic resonance (NMR) spectrometry, time-of-flight secondary ion mass spectrometry (TOF-SIMS), and conventional spectroscopic and microscopic techniques. 27Al NMR spectra show that the Al coordination resonances in HfO 2 -Al 2 O 3 mixtures change with the Al content. The content of five-coordinate Al (Al V) is positively correlated with the content of ternary compounds, indicating that the Al–O bonds in ternary compounds tend to be connected at the five-coordinated Al site, which is further demonstrated through annealing experiments of HfO 2 -Al 2 O 3 mixtures. Further, the impact of the above microscopic properties on the macroscopic performance, such as wettability and optical bandgap, has also been explored. Our insights into Al coordination resonances and ternary compounds in HfO 2 -Al 2 O 3 mixtures may help understand the structure–function relationship of mixture coatings. [Display omitted] • The content of ternary compounds in HfO 2 -Al 2 O 3 mixture coatings is affected by mixing ratio and annealing temperature. • Mixing leads to a sharp increase in the content of five-coordinated aluminum. • Changes in the content of five-coordinated aluminum affect the wettability of the coatings. [ABSTRACT FROM AUTHOR]

We investigate a Josephson junction where the weak link consists of a nanomagnetic dimer, featuring two large, antiferromagnetically coupled spins under simple easy-axis anisotropy. In this setup, the exchange coupling constant serves as a transverse anisotropy constant, and the quantum tunneling of the magnetization is influenced by the supercurrent, which behaves like an external magnetic field applied along the hard axis. Our results demonstrate that the superconducting current induces non-Kramers freezing and unfreezing of the magnetic moment's tunneling within a biaxial spin model driven by exchange interaction. We derive an exact expression for the quenching condition caused by the exchange coupling. Additionally, we extend our analysis to tunneling phenomena in two antiferromagnetically or ferromagnetically coupled spins biased by the anisotropic exchange interaction, revealing more varied cases of tunnel splitting. [ABSTRACT FROM AUTHOR]

A coupling reaction between arylaldehydes and ethyl trichloroacetate is facilitated by PPh 3 under mild conditions to stereospecifically produce (Z)-ethyl α-chloroacrylates. This stereospecific coupling reaction only occurs when the arylaldehyde derivative has an electron-withdrawing substituent. On the other hand, when an electron-donating group is present in the aromatic ring, the aryldichloromethyl derivative is formed as the only product, even at low temperature. The stereospecificity in the coupling reaction was established based on the coupling constants 2J CH and 3 J CH in the 13C NMR and crystal-X-ray analysis. From this data we propose that the formation of these compounds occurs through two intermediates initially formed by the reaction between the PPh 3 and ethyl trichloroacetate. [Display omitted] [ABSTRACT FROM AUTHOR]

Some fraction of the diffuse photon background is supposed to be linked to high-energy neutrinos by astrophysical mechanisms of production and electromagnetic cascades. This article presents a simulation study of axion-like particles (ALPs) implications for that component, exploiting transport equations. Alternations of that spectrum due to ALP-photon conversion in the intergalactic magnetic field (IGMF) in the cases of various ALP parameters and mixing regimes at sources are studied. The results indicate considerable influence of IGMF-conversion on the ALP-photon flux even in the case of inverse ALP-photon coupling constant M equal to 1011.5 GeV and some residual effects in the case of M = 10 12 GeV. Furthermore, the scenario shows another aspect of a complex multimessenger interplay between IceCube and Fermi data, to a certain extent relieving the tension between them, the existence of which is commonly interpreted to be a signature of limited transparency of the neutrino sources population. [ABSTRACT FROM AUTHOR]

In a recent work we have proposed an original analytic expression for the partition function of the quartic oscillator. This partition function, which has a simple and compact form with no adjustable parameters , reproduces some key mathematical properties of the exact partition function and provides free energies accurate to a few percent over a wide range of temperatures and coupling constants. In this work, we present the derivation of the energy spectrum of this model. We also generalize our previous study limited to the quartic oscillator to the case of a general anharmonic oscillator. Numerical applications for a potential of the form V (x) = ω 2 2 x 2 + g x 2 m show that the energy levels are obtained with a relative error of about a few percent, a precision which we consider to be quite satisfactory given the simplicity of the model, the absence of adjustable parameters, and the negligible computational cost. • The partition function of quantum oscillators is expressed using a path integral formulation. • The path integral is evaluated by combining a short-time gaussian approximation and a principle of minimal sensitivity. • Analytic expressions for the energy levels of the one-dimensional anharmonic oscillator are derived. • The energy spectra of the quartic, sextic, and pure quartic oscillators are shown as a function of the coupling constant. • A relative error of a few percent is obtained for the energy levels. [ABSTRACT FROM AUTHOR]

[Display omitted] • Mode orthogonality is used for highly-integrated long-range parallel transmissions. • The RDMMW provides more freedom to manipulate the channel features in real time. • The RDMMW can suppress coupling between two channels within a limited space. • Mode coupling of the RDMMW will not increase with the waveguide length. With the rapid growth of information flux, integrating more channels in limited spaces has been a critical requirement for highly-integrated long-range parallel transmissions. Although meta-waveguides, such as spoof surface plasmon polariton (SSPP) waveguides, can suppress crosstalk between adjacent channels, it is still urgent to seek new methods to further increase the number of channels without occupying additional space. Here, we propose a reconfigurable dual-mode meta-waveguide (RDMMW) by integrating diodes into meta-units, which supports two independent channels using two orthogonal modes. The RDMMW can be switched among dual-mode, even-mode, odd-mode and cutoff states by controlling the diodes, which provides more freedom to manipulate the channel features. The RDMMW possess two outstanding merits in highly-integrated long-range parallel transmissions, including lower coupling between two channels than conventional single-mode waveguides and constant mode coupling in longer waveguides. Thus the proposed RDMMW has advantages of multi-mode, reconfiguration, low coupling and high integration density, providing a new avenue to realize highly-integrated multi-functional systems. [ABSTRACT FROM AUTHOR]

A systematic study was conducted to investigate the effect of substituting C by N on the crystal structure and elastic electronic properties in the Ti 2 InC (1-x) N x phases using the DFT framework implemented in the CASTEP code. Initially, the crystalline structure was stabilized by geometric optimization of the Ti 2 InC (1-x) N x phases. The structural properties showed that the lattice parameters a and c and, consequently, the volume decreased because of the difference between the ionic radius of C and N. According to Born's structural stability criterion, the phases with a hexagonal structure are stable for all the ranges of N content studied. Analysis of mechanical moduli shows an increase between 0.00 < x < 0.25 and a decrease for x > 0.50 in Young's modulus. At the same time, the Pugh and Poisson ratios show the phases are brittle between 0.00 < x < 0.75, ductile for x = 1.00, and all metallic, respectively. Electronic band structure calculations confirm this metallic behavior, supported by the DOS analysis. Finally, as expected, the PDOS shows an increase in the electronic states of the 2 p -C (N) orbitals because of the substitution of C for N. Consequently, the density of states at the Fermi level N(E F = 0) increases as the N content rises. Finally, using the Frolich model, we observe an increase in T c as the N content increases; as a result, the electron-phonon coupling constant values increase from 0.51 to 0.62; these values imply the phases are moderately coupled superconductors. • A systematic study was conducted to investigate the effect of substituting C by N on the crystal structure and elastic electronic properties in the Ti 2 InC (1-x) N x phases using the DFT. • Using the Frolich model, we observe an increase in Tc as the N content increases; as a result, the electron-phonon coupling constant values increase from 0.51 to 0.62; these values imply the phases are moderately coupled superconductors. • Analysis of the electronic band structure and DOS shows that all phases exhibit metallic behavior. • In accordance with the results obtained in this work, the increase of states in DOS (at N(E F)) is due to the 3 d -Ti orbital (due to this contribution, the metallic behavior is obtained), which may be responsible for increasing the superconducting transition temperature. [ABSTRACT FROM AUTHOR]

Markarian 421 is a well-known nearby BL Lac blazar at the redshift z = 0.031. Many previous works were investigated to constrain the axion-photon coupling from its TeV gamma-ray observations, showing the upper limit on the coupling constant g a γ ≲ 2.0 × 10 − 11 Ge V − 1 for the axion mass [ 5.0 × 10 − 10 eV ≲ m a ≲ 5.0 × 10 − 7 eV ]. While in this work, we obtain a more stringent upper limit on the axion-photon coupling from the 1038 days gamma-ray observations of the blazar Markarian 421. The long-term VHE gamma-ray spectra are measured by the collaborations Large Area Telescope on board NASA's Fermi Gamma-ray Space Telescope (Fermi-LAT) and High Altitude Water Cherenkov (HAWC) Gamma-Ray Observatory from 2015 June to 2018 July. We show the best-fit spectral energy distributions (SEDs) of Markarian 421 under the null and axion hypotheses. Then we set the axion-photon limit in the { m a , g a γ } plane. The 99% C. L. upper limit set by Markarian 421 is g a γ ≲ 4.0 × 10 − 12 Ge V − 1 for the axion mass [ 1.0 × 10 − 9 eV ≲ m a ≲ 1.0 × 10 − 8 eV ]. It is the most stringent upper limit in this axion mass region. [ABSTRACT FROM AUTHOR]

[Display omitted] • Compare the effects of steric hindrance and heavy atom on the singlet–triplet transition process. • Steric hindrance effect greatly facilitates the intersystem crossing. • Decreased recombination energy induced by heavy atom effect extends the triplet-exciton lifetime. The para -linked carbazole-biphenyl (CBP) is commonly utilized in phosphorescent organic light-emitting diodes. This study investigates the steric hindrance and heavy-atom effects in CBP derivatives through transient absorption spectroscopy. In contrast to CBP, CBP derivatives shows new triplet–triplet absorption signals and isosbestic points, accompanied by the decay of excited state absorption signal, which indicates the occurrence of intersystem crossing (ISC). The experimental ISC lifetimes for mCBP, CDBP, and CPB-2Br are 8 ns, 7.4 ns, and 0.103 ns respectively, aligning with the increased theoretical spin–orbit coupling constants (ξ) of S 1 → T 1 (0.032 cm−1 < 0.034 cm−1 < 1.26 cm−1). Notably, compared to CDBP (0.75 cm−1, 0.3 μs), the lower ξ(T 1 , S 0) of mCBP (0.014 cm−1) extending the experimental triplet-exciton lifetimes (τ T) to 1.97 μs. The τ T (1.92 μs) of CBP-2Br is prolonged due to the significantly reduced recombination energy (2073.52 cm−1). This study provides insights into prolonging the lifetime of halogen-free phosphorescent molecules. [ABSTRACT FROM AUTHOR]

The application prospects of semiconductor lasers with high beam quality and high power are exceptionally broad. To achieve good beam quality and fundamental transverse mode output at high currents, we investigated the coupling characteristics of coupled arrays in supersymmetric semiconductor lasers. The results indicate that increasing the number of sub-waveguides increases the generation of supermodes, resulting in a significant distribution of higher-order transverse mode light fields within the coupled array. This enhancement increases the coupling constant and reduces the confinement factor beneath the gain main waveguide, subsequently elevating the loss of higher-order transverse modes, which improvement contributes to the stability of fundamental transverse mode output at high gain levels in the main waveguide. Additionally, we fabricated a bilateral unsymmetrically coupled array semiconductor laser with four sub-waveguides. The device achieves a quasi-single-lobe horizontal far-field distribution with a full width at half maximum (FWHM) of 2.5° at an injection current of 1 A, which is about 54.5% higher than that of a conventional laser with a ridge width of 40 μm. Furthermore, the output power at 1 A is 376.7 mW, with an M2 value of less than 2.98. [ABSTRACT FROM AUTHOR]

• Conformational patterns of 2-halo-1-phenylpropanols determined in different solvents. • Experimental and theoretical NMR 3 J H H measurements. • Competition of stereoelectronic effects drives the conformational trends. • Contribution of hyperconjugation, C-X···π and C H···π interactions. Experimental and theoretical 3 J H H scalar coupling constants allowed the identification of the conformational landscape of erythro (e X) and threo (t X) 2-halo-1-phenylpropanols (halo = F, Cl, and Br). NMR scalar coupling constants captured dynamics of the O C-C-X dihedral and OH rotameric states, in a dynamic and solvent-dependent equilibrium. The erythro series revealed a particular halogen-dependent equilibrium, which showed different sensitivity to the media, especially in acetone, where the e F populations were completely shifted. At the same time, threo showed a highly solvent-sensitive equilibrium. NBO calculations showed the importance of electron delocalization over steric and electrostatic effects to stabilize the preferred synclinal conformer in both diastereomers. A Principal Component Analysis (PCA) on the NBO stabilization energies pointed to a complex mixture of electronic delocalization happening simultaneously. Hyperconjugative interactions are significant, but they are not the only important effect. Non-covalent interactions were also identified through NCI surfaces. Hydrogen bonds and intramolecular C-X···π and C H···π interactions were proved to act differently in the two diastereomers, affecting their equilibria in different ways. Nuclear Overhauser (NOE) NMR experiments point to an intramolecular C H···π contact, while 1H NMR of the aromatic hydrogens evidence an intermolecular effect of acetone and DMSO on the phenyl ring. DFT with explicit solvation shows a solvent shell favoring intermolecular C H···π contacts, in agreement with the experiments. This thorough analysis revealed that intra- and intermolecular factors contribute to the preference for the synclinal conformer in the studied compounds. [Display omitted] [ABSTRACT FROM AUTHOR]

[Display omitted] • 35Cl electric-field-gradient tensor of polychlorotrifluoroethylene can be determined by NQR combined with solid-state NMR. • Quadrupole coupling constant of 79.6 ± 1.2 MHz and asymmetric parameter of 0.06 ± 0.02 are obtained at T = 80 K. • A method for searching an NQR signal, using a field-variable superconducting magnet, is described. Determination of 35Cl electric-field-gradient (EFG) tensor of polychlorotrifluoroethylene (PCTFE) at T = 80 K, using nuclear quadrupole resonance (NQR) and field-stepwise-swept solid-state nuclear magnetic resonance (NMR), has been presented. The quadrupolar frequency is found to be 39.85 MHz with standard deviation of 0.25, and full width at half maximum of 0.59 MHz. The analysis of the field-stepwise-swept solid-state 35Cl NMR spectrum provides the asymmetric parameter (η Q) of 0.06 ± 0.02, from which the quadrupole coupling constant (C Q) is obtained to be 79.6 ± 1.2 MHz. One of the most efficient methods for searching an NQR signal, using a field-variable superconducting magnet, is described. [ABSTRACT FROM AUTHOR]

• WRuP is both mechanically stable and ductile with strong metallic bonding. • The main contribution to the N(EF) comes from the W 5d electrons. • The phonon band structure shows that WRuP is dynamically stable. • The calculated Tc value of WRuP, 5.68 K is in excellent agreement with the experimental value of 5.5 K. The properties of orthorhombic WRuP were thoroughly analyzed using the generalized gradient approximation of density functional theory and the plane-wave pseudopotential method. Our findings indicate that the structural, electronic, elastic, and mechanical properties of WRuP are in good agreement with experimental data, suggesting that this superconductor is both mechanically stable and ductile with strong metallic bonding. The band structure analysis reveals that WRuP behaves metallically, with the density of states primarily contributed by the d states of the transition metal atoms. Furthermore, the phonon band structure analysis demonstrates that WRuP is dynamically stable, with no imaginary phonon frequencies, and the estimated electron-phonon coupling constant (λ) is 0.69. According to our calculations using the Allen–Dynes formula, the superconducting transition temperature of WRuP is estimated to be 5.74 K, consistent with the experimental value of 5.5 K. These results collectively show that WRuP is a conventional phonon-mediated superconductor with strong electron-phonon coupling. [ABSTRACT FROM AUTHOR]

• The paramagnetic center in 2-nitrobenzoic acid single crystal was examined. • Gamma ray created a resonance structure in the carboxyl group. • The 2-nitrobenzoic acid anion radical was formed. • Paramagnetic structure was analyzed by EPR spectroscopy. 2-nitrobenzoic acid (C 7 H 5 NO 4) (2NBA) single crystals were made paramagnetic using 60Co-gamma rays. An attempt was made to detect the resonance form formed in 2-nitrobenzoic acid single crystal with Electron Paramagnetic Resonance (EPR) Spectroscopy. EPR spectra were taken at 125 K in three different axes of the crystal. As a result of EPR analysis of gamma irradiated 2NBA single crystal, it was understood that 2NBA anion radical was formed. The principal values of the hyperfine structure constants, the principal values of the g-tensor and their direction cosines were calculated. [ABSTRACT FROM AUTHOR]

• Sesquiterpenoids from Acorus calamus with complex NMR profiles were isolated. • Detailed 1H and 13C NMR spectral assignments were performed. • First complete determination of 1H NMR data using spin simulation. • Confirmed relative configurations and most stable conformations. • Findings are crucial for understanding biological activities of the oil. The majority of published 1H NMR data for sesquiterpenes and other natural products are significantly affected by overlapping signals, especially those of higher order, making them largely unusable or only marginally useful. In this study, an acorenone-rich rhizome essential oil of Acorus calamus L. (Acoraceae, Acorales) yielded pure, potentially biologically significant sesquiterpenoids: preisocalamenediol, isocalamenediol, shyobunone, isoshyobunone, and acorenone. Due to the lack of complete NMR data, we performed a detailed assignment of the 1H and 13C NMR spectra of these compounds. A spin simulation of the 1H NMR spectra was conducted, allowing for the first time the complete determination of all relevant NMR data (1H NMR chemical shifts, 1H-1H coupling constants). This led to the confirmation of their relative configurations and the determination of their most stable conformations. The NMR-derived conformational data offer valuable insights into the structural properties of the oil's sesquiterpenic constituents, enabling molecular docking studies to predict their interactions with biological receptors and explain their observed biological activities. [Display omitted] [ABSTRACT FROM AUTHOR]

• Salvipisone, an abietane diterpenoid, was isolated from Salvia aethiopis L. • Its structure was elucidated using a combination of spectroscopic methods. • An analysis revealed discrepancies with previously reported NMR data of salvipisone. • Salvipisone demonstrated significant efficacy against tested Gram-positive bacteria. • In silico studies suggested significant potential for inhibiting the enzyme gyrase. Salvipisone, an abietane diterpenoid, was isolated from the roots of Salvia aethiopis L. using a combination of chromatographic separation techniques. Its structure was elucidated employing a variety of spectroscopic methods, including ultraviolet (UV), infrared (IR), 1D and 2D nuclear magnetic resonance (NMR), and mass spectrometry. A comprehensive analysis of experimental 1D and 2D NMR data, incorporating 1H iterative full spin analysis and higher-order multiplet simulation, revealed discrepancies with previously reported NMR data for this compound. Detailed examination of the 1H NMR spectrum's spin-spin coupling structure provided insights into the relative populations of the three staggered conformers around the C12–C13 bond at room temperature. The conformer populations were determined using the relationship between the experimental values for vicinal coupling constants and the estimated ones for the preferred staggered conformers, yielding a ratio of approx. 80:4:16 for anti, gauche , and gauche ′-conformers, respectively. Possible reasons for the observed unevenly populated staggered conformers were also discussed. The antimicrobial activity of salvipisone was evaluated using in vitro and in silico methods. In vitro antimicrobial assays demonstrated that salvipisone exhibited the highest inhibitory effect against Staphylococcus aureus ATCC and Enterococcus faecalis ATCC (MIC = 3.125 μg/mL), followed by Bacillus subtilis ATCC (MIC = 6.25 μg/mL). In contrast, concentrations above 100 μg/mL were necessary to inhibit Escherichia coli ATCC and Klebsiella pneumoniae ATCC. In silico studies suggested that salvipisone, particularly its keto form, has significant potential for inhibiting the enzyme gyrase, highlighting its mechanism of antimicrobial action. Our findings highlight the promising antimicrobial and inhibitory properties of salvipisone, particularly against Gram-positive bacteria such as S. aureus. [Display omitted] [ABSTRACT FROM AUTHOR]

The properties of weak coupling optical deformation potential (ODP) bound polaron in asymmetrical Gaussian confinement potential quantum well (AGCPQW) in the presence of magnetic field (MF) has been examined. The ground state energy (GSE) and the ground state binding energy (GSBE) of ODP bound polaron are calculated following Lee-Low (LLP) Pines approach. The influence of MF, the height of AGCPQW, the electron-phonon (e-p) coupling constant and Debye cut-off wavenumber (DCOW) on the GSE and the GSBE are also studied. It is shown that the GSE is a decreasing function of height of AGCPQW, e-p coupling constant, Coulombic potential and DCOW. In addition it is an expanding function of the height of AGCPQW. We also found that the GSBE enhanced with height of AGCPQW, e-p coupling strength, Coulombic potential and DCOW, whereas it is a decayed one of the cyclotron frequency. At some critical points the GSE is equal to the GSBE meaning that the free electron and phonon behave as a double polaron helpful for the comprehension of the superconductivity. It is found that the modulation of the height of AGCPQW, the cyclotron frequency, e-p coupling constant and DCOW lead to the control of the properties of the ODP bound polaron in AGCPQW. • Weak coupling non polar bound polaron in asymmetrical Gaussian confinement potential quantum well under magnetic field. • The ground state energy and binding energy of ODP bound polaron are calculated using Lee-Low Pines approach. • Modulation of the height of AGCPQW, cyclotron frequency, e-p coupling constant and DCOW lead to the control of the properties. [ABSTRACT FROM AUTHOR]

It is shown that the processes e + e − → π + π − and τ − → π − π 0 ν τ can be described in a unified approach in satisfactory agreement with experiment using the vector coupling constant g ρ = 6. In this case, in addition to quark loops, it is also necessary to take into account meson loops corresponding to the next order in 1 / N c. These loops must be taken into account when describing the γ (W) → ρ transition, as well as in interaction of mesons in the final state. [ABSTRACT FROM AUTHOR]

• A novel approach for magneto-optical transmission maximization is designed based on nanoring morphology engineering and time dependent magnetic field. • Prior inaccurate association of the dynamics of magneto-optical transmission to magnetic field interactions in literature is corrected. • The renormalization group equations and the scaling theory are utilized for the first time to find the critical concentration for the delocalization-localization transition. • For the first time, the renormalization group equations and the scaling theory are applied quantitatively and for observable quantities. This study leads novel approaches to overcome cluster induced magnetic field formation and the associated reduced light transmission beyond a certain critical magnetic field utilizing the ring morphology and time-varying magnetic field. This hypothesis is challenged by the fabrication of large size ferromagnetic, hematite nanoring and nanodisk samples to increase the coupling constant and the interparticle interactions. The nanoring sample transmission outperformed the nanodisk one by 40–50 % under 0.5 mT, 1–5 kHz time-varying magnetic fields, 12 % in the uniform 0–6.5 mT field, and 27 % in the 40x greater gradient field amplitude by Neodymium magnet. Furthermore, the dominant literature view of the dynamics of optical transmission through ferrofluids is corrected. Moreover, the decrease in the optical transmission in the 350–450 nm band is justified in terms of localization, which is found to occur beyond a certain critical concentration, described by the proposed, experimentally verified power law utilizing the results of the renormalization group equation and scaling theory, for the first time. Therefore, challenging limitation of restriction to their qualitative utilization and non-observable quantities besides the previously doubted matching between the method of invariant imbedding and the renormalization group equation have been all resolved, which is crucial for the entire field of complex media. [ABSTRACT FROM AUTHOR]

For the Klein-Gordon-Dirac equation (KGDE) with small coupling constant ε ∈ (0 , 1 ] , we propose a Lawson-type exponential wave integrator Fourier pseudo-spectral (LEWIFP) method and establish the improved uniform error bounds in the time domain at O (1 / ε). We first convert the KGDE to a coupled system and then consider LEWIFP method for the coupled system. The LEWIFP method is proved to be time symmetric which is an important structure in numerical geometric integration. Through careful and rigorous convergence analysis, we establish the error bounds O (h m + ε τ 2 + τ 0 m) for the full-discretization, where m is determined by the regularity conditions. If the solution is sufficiently smooth with m sufficiently large, we obtain the errors with improved uniform bounds at O (h m + ε τ 2) in the long-time domain up to O (1 / ε). These error bounds are much better than the classical bounds O (h m + τ 2) provided by the traditional analysis for the non-Lawson-type exponential wave integrators equipped with Fourier pseudo-spectral method. Combined with the classical analysis tools such as mathematical induction and energy method, we complete our error analysis by adopting the regularity compensation oscillation (RCO) technique which controls the high frequency modes by the regularity of the solution and low frequency modes by phase cancellation. By applying the LEWIFP method to some problems, we show the numerical results to support our error bounds. In addition, the numerical results also show that the discrete mass and energy are stable in the time domain which is long enough. Finally we extend our method to the oscillatory problem. • Propose a exponential wave integrator method for the Klein-Gordon-Dirac equation. • Establish the improved uniform error bounds in the time domain at O(1/ ε). • Show the numerical results to support our error bounds. • Show that the discrete mass and energy are stable in the time domain which is long enough. • Extend our method to the oscillatory problem. [ABSTRACT FROM AUTHOR]

Anemone vitifolia is a small herb found in Asia that is used to treat a range of diseases in Chinese traditional medicine. GNPS-based molecular networking of an Anemone vitifolia specimen revealed the presence of a network containing numerous ions indicating the presence of lignans, several of which suggested that there might be previously undescribed compounds in the extract. Fractionation of the organic extract yielded five undescribed lignans, the vitifolignans, together with one known. The structures were identified based on extensive spectroscopic data analysis (NMR, HR-ESI-MS, and UV), coupling constant calculation and comparison with reported data. Their absolute configurations were determined by comparison of experimental ECD spectra with calculated spectra. Compounds 4/5 showed weak inhibition of LPS-induced NO production in mouse mononuclear macrophages. Molecular Networking aided in the isolation of the vitifolignans, previously undescribed lignans with unusual C-9 side chains; computational methods were crucial in determining their absolute configurations. [Display omitted] • Molecular networking was applied to lignan discovery in Anemone vitifolia. • 3,4-Dibenzyltetrahydrofuran lignans with furanone & glycerol sidechains isolated. • Computation of ECD spectra and semi-synthesis determined absolute configuration. [ABSTRACT FROM AUTHOR]

In this paper, we exploration a Petrov type-N vacuum solution to Einstein's field equations, while incorporating a negative cosmological constant (Λ < 0) within the framework of modified gravity theories. This solution intriguingly accommodates closed time-like curves at a particular moment in time, effectively violates the causality condition, thus acts as a time-machine model. A key observation is that the determinant of the Ricci tensor R μ ν for this particular Einstein space metric differs from zero. This noteworthy finding suggests to the existence of an anti-curvature tensor defined A μ ν = R μ ν − 1 and hence, an anti-curvature scalar A = g μ ν A μ ν , which is introduced with the Lagrangian of the system, thereby giving rise to as Ricci-inverse gravity theory. We consider class-I models of Ricci-inverse gravity, where the function f = f (R , A) = (R + κ A) with κ is the coupling constant. We demonstrate that this Einstein space metric serves as a vacuum solution with a negative modified cosmological constant within the framework of Ricci-inverse gravity. Consequently, the violation of causality persists within this new gravity theory as well. Moreover, we solve the modified field equations by considering matter content other than vacuum and demonstrate that the energy-density and isotropic pressure satisfies the equation ρ = − p = 3 κ Λ . • Einstein space solution is analysed in GR. • Modified gravity of f(R, A) is studied in this solution background. • Obtained solutions of the modified field equations. • Cosmological constant gets modification by coupling parameter in vacuum as matter energy content. [ABSTRACT FROM AUTHOR]

• LiNbO 3 crystal fibers were obtained by Laser Heated Pedestal Growth (LHPG) technique. • Resonance method was validated through numerical simulations with COMSOL software. • LiNbO 3 crystal fibers could be employed as piezoelectric temperature sensor. This study focuses on the growth and characterization of crystalline LiNbO 3 (LN) piezoelectric fibers pulled by the Laser Heated Pedestal Growth (LHPG) technique. The electrical properties of the fibers were investigated using an impedance analyzer, which yielded values for resonance frequency, anti-resonance frequency, and phase angle. Subsequently, elastic constants and coupling factor were determined through calculations based on thickness resonance modes. The accuracy of the resonance method was validated through numerical simulations utilizing COMSOL software, demonstrating a close agreement between experimental and simulated results. Additionally, a temperature sensing was conducted, subjecting the fibers to a wide temperature range from 30 °C to 236 °C to assess their sensitivity to temperature variations. The coupling factors of K = 0.37 for LN-1 and K = 0.35 for LN-2 demonstrated efficient performance of the crystalline fibers. Furthermore, the numerical simulations exhibited strong correlation between simulated and experimental data. The sensitivity analysis revealed the potential of LN fibers for temperature sensor applications, exhibiting a sensitivity of −87 Hz.°C−1. These findings underscore the promise of LN piezoelectric fibers in advanced sensing technologies. [ABSTRACT FROM AUTHOR]

The escape process of a dimer is studied in a bistable potential in the presence of additive Ornstein-Uhlenbeck (OU) noise. The escape rate of the dimer shows a non-monotonic dependence with respect to the harmonic spring constant, κ. However, an increase in the correlation time, τ of the OU noise causes a delay in the escape mechanism of the dimer. Another important observation is that the optimal spring constant, k o p t , at which the escape rate peaks changes with the correlation time. In summary, a complex interplay between the harmonic force and the correlation time of the OU noise is involved in the escape process of the dimer. • A system of a dimer made of up two monomers is coupled by harmonic and Morse potential. • There exists a non-monotonic dependence of the escape rate with respect to the coupling strength. • The escape rate decreases exponentially with correlation time. • Complex interplay between the coupling constant and the correlation time. [ABSTRACT FROM AUTHOR]

Magnetic properties of amorphous Gd-Co ferrimagnetic films prepared by magnetron sputtering have been studied for various thicknesses. In a certain temperature range close to the magnetic compensation temperature, triple hysteresis loops and the characteristic features of the tempera-ture dependencies of magnetization were observed for all samples under consideration. Two-layer film model with an inhomogeneous chemical composition and a spin-flop transition scenario in two sub-lattice ferrimagnet was employed for understanding the origins of these phenomena. Within the framework of the spin-flop transition, the inter sub-lattice exchange coupling constant was estimated using various methods. [ABSTRACT FROM AUTHOR]

• Localized current source coupled to cosmic harmonic axion field. • Possible finite non-zero photon mass. • Interplay between photon mass and axion mass. • Effects on radiation power from a static magnetic dipole source. Electromagnetic fields from localized current source interacting with an oscillatory cosmic axion field are studied, accounting for the possibility of a finite photon mass. In particular, focus will be on the dipole radiation from static current sources. The Proca theory is generalized to include the axion field and solutions to the modified EM field equations are obtained to first order in the axion coupling parameter. Analysis of the interplay between the two vanishingly small parameters – the axion mass (via the coupling constant and the oscillating frequency) and the photon mass – is carried out with reference to possible future detection of the cosmic axion and/or the photon mass via electromagnetic interaction with the axion. [ABSTRACT FROM AUTHOR]

• The luminogens show long-lived room temperature phosphorescence in crystalline and doping systems. • Room temperature phosphorescence of the luminogens can be excited by visible light. • DCP show single component dynamic room temperature phosphorescence. • The luminogens show blue room temperature phosphorescence in doping systems. • The luminogens can be prepared on a large scale with high yields and mild reaction conditions. A pure organic room temperature phosphorescence (PORTP) luminogen named as DCP was successfully prepared and showed long room temperature phosphorescence (RTP) and afterglow lifetimes (3 ms and 4 s in sequence). Meanwhile, DCP showed high fluorescence (0.14) and RTP (0.39) quantum yields in crystalline state, simultaneously presented visible light excitation and dynamic RTP. By host-guest doping and optimization, Urea/DCP doping system emitted blue RTP, with RTP and afterglow lifetimes of 341 ms of 5 s in turn. Crystal analysis and theoretical calculations indicated H stacking, large spin orbit coupling constant, and small energy gap between the lowest singlet and triplet states result in long RTP lifetime and high quantum yield for DCP. Based on long phosphorescence emission, an advanced anti-counterfeiting pattern was constructed. As far as we know, it is the first report that such small molecules containing 3, 5-dicyanopyridine show long-lived RTP in both crystalline state and doping system. In this paper, not only ultralong and blue PORTP materials with the advantage of large-scale preparation, but also single component dynamic RTP, and RTP of visible light excitation were achieved. [ABSTRACT FROM AUTHOR]

Our main motive is to model and study the mass-radius relation of the specific isolated compact star R X J 1856.5 − 3754 in the background of the late time accelerated Universe and to achieve the equation of state of the core matter under stable equilibrium in f (R , T) modified gravity using Tolman-Kuchowicz metric potentials. Einstein-Hilbert action is taken as f (R , T) = R + 2 ξ T , where R and T are the Ricci scalar and the trace of energy-momentum tensor respectively and ξ as coupling parameter. Modified Tolman-Oppenheimer-Volkoff equations are numerically solved by considering the presence of modified Chaplygin gas inside the star and also solving the corresponding field equations. We have got an explicit scenario of the structural evolution of isolated neutron stars through accelerating spacetime. Interestingly, all the derived outcomes of this investigation have become compatible with physically adopted regimes which reveal the physical viability of this current model. • Current study investigates the effect of minimal matter-gravity coupling in case of an isolated compact star. • The presence of modified Chaplygin gas inside the stellar core has been considered. • To obtain the model the Tolman–Kuchowicz ansatz and a linear form of f(R, T) modified gravity have been considered. • The measurement of the coupling constant and various parameters have been examined through graphical plots. • We have studied the mass–radius relation to determine the maximum permitted mass. [ABSTRACT FROM AUTHOR]

[Display omitted] • Three new carbazole isomers were designed and synthesized. • The isomers show high-contrast RTP and mechanochromism. • The isomers show time-dependent RTP by host–guest doping. • The isomers show unusual anti-Kasha behaviors. • Lo-CzAD and Lp-CzAD simultaneously show RTP and TADF emission in PPh 3 matrix. To explore the intrinsic mechanism of pure organic room temperature and clustering-induced phosphorescence and investigate mechanochromism and structural-function relationships, here, 4-(2-(9H-carbazol-9-yl)phenyl)-2-amino-6-methoxypyridine-3,5-dicarbonitrile (Lo-CzAD), 4-(3-(9H-carbazol-9-yl)phenyl)-2-amino-6-methoxypyridine-3,5-dicarbonitrile (Lm-CzAD), and 4-(4-(9H-carbazol-9-yl)phenyl)-2-amino-6-methoxypyridine-3,5-dicarbonitrile (Lp-CzAD) were designed and synthesized by choosing self-made carbazole and 3, 5-dicyanopyridine (DCP) unit as electron acceptor and electron donor in sequence. Compared with crystals Lm-CzAD and Lp-CzAD, crystal Lo-CzAD shows better room temperature phosphorescence (RTP) performance, with RTP lifetimes of 187.16 ms, as well as afterglows 1s, which are attributed to twisted carbazole unit and donor–acceptor (D-A) molecular conformation, big crystal density and spin orbit coupling constant ξ (S 1 → T 1 and S 1 → T 2), as well as intermolecular H type stacking and small ξ (S 0 → T 1). By choosing urea and PPh 3 as host materials and tuning doping ratio, four doping systems were successfully constructed, significantly improving RTP performance of Lo-CzAD and Lp-CzAD, as well as showing different fluorescence and RTP. The lifetimes and afterglows of pure organic Urea/Lo-CzAD and Urea/Lp-CzAD systems are up to 478.42 ms, 5 s, 261.66 ms and 4.5 s in turn. Moreover, Lo-CzAD and Lp-CzAD show time-dependent RTP in doping systems due to monomer and aggregate dispersion, as well as clustering-induced phosphorescence. Based on the different luminescent properties, multiple information encryptions were successfully constructed. [ABSTRACT FROM AUTHOR]

We consider black holes with quintessence matter and cloud of strings to study shadow, optical appearance and stability by using the extended generalized uncertainty principle. We first evaluate the relations for modified Hawking temperature, heat capacity, equation of state and remnant mass for the considered model and then plot these relations in order to analyze the quantum correction effects on the stability of the black holes. In the visual plot of specific heat, we observe critical regions where the black hole transitions from being thermodynamically stable to unstable and vice versa. Moreover, we also observe that the regions of stability and instability are not uniform across, suggesting that extended generalized uncertainty principle plays a vital role in thermodynamic properties. We also investigate the silhouette and optical properties of the Lovelock black hole, particularly analyzing illumination with two theoretical models of static accretion. We observe that different values of Lovelock coupling constants significantly influence the size of image and intensities of the black hole. [ABSTRACT FROM AUTHOR]

[Display omitted] A Fortran code named TTEP (Thermal Transport from constant Electron-Phonon coupling approximation) is presented in this work. Within the framework of first-principles calculation, this code utilizes the deformation potential approximation to replace the electron–phonon (EP) coupling matrix element in the phonon scattering due to EP interaction. By adopting this approximation, our method achieves a balance between computational efficiency and accuracy, enabling the exploration of the thermal transport from EP interaction with much reduced computational consumption. One of the key features of TTEP is its versatility in handling a broad range of carrier concentration, including both hole and electron doping. We also extend the applicability of TTEP to actual doping case and capture EP effect over a wide temperature range. Other scattering mechanisms, such as grain boundary scattering and phonon–phonon interaction, have been included in the calculation of lattice thermal conductivity through the Matthiessen's rule. Several test cases are presented in this work to demonstrate the above features. [ABSTRACT FROM AUTHOR]

Dislocation loop motion plays an important role in irradiation creep but their dynamic evolution is hardly investigated. In this work, the one-dimensional motion of loops was investigated by in-situ TEM in Fe9Cr1.5W ferritic/martensitic steel under the combination of irradiation and constant compression stress and compared with the case of irradiation only to highlight the synergistic effect. Loops preferred to glide along one side that was close to the compression direction and the other side was retarded.. The proportion of large mobile loops was also increased. Jump frequency was doubled after the addition of compression, indicating the high sensitivity to stress. [ABSTRACT FROM AUTHOR]

The zeroth law of black hole mechanics asserts that the stationary black hole has a constant surface gravity on the event horizon. This study investigates the zeroth law within the Einstein-Scalar-Gauss-Bonnet gravity, particularly involving a complex scalar field (ECSGB). Assuming that the Lie derivative of the complex scalar field is proportional to itself other than stationary, and that ECSGB gravity converges to the Einstein's gravity analyticaly as the coupling constant approaches zero, as well as the minimally coupled matter fields satisfy the dominant energy condition, we demonstrate that the surface gravity remains constant over the entire event horizon without reliance on additional symmetries. [ABSTRACT FROM AUTHOR]

We suppose that there exist three vector hidden-charm tetraquark states with the J P C = 1 − − at the energy about 4.5 GeV , and investigate the two-body strong decays systematically. We obtain thirty QCD sum rules for the hadronic coupling constants based on rigorous quark-hadron duality, then obtain the partial decay widths, therefore the total widths approximately, which are compatible with the experimental data of the Y (4500) from the BESIII collaboration. The Y (4500) may be one vector tetraquark state having three main Fock components, or consists of three different vector tetraquark states. We can search for the typical decays Y → D ¯ 1 0 D 0 − D ¯ 0 D 1 0 2 , D ¯ 1 − D + − D ¯ − D 1 + 2 , D ¯ 0 0 D ⁎ 0 − D ¯ ⁎ 0 D 0 0 2 , D ¯ 0 − D ⁎ + − D ¯ ⁎ − D 0 + 2 , η c ω , J / ψ ω to diagnose the nature of the Y (4500). [ABSTRACT FROM AUTHOR]