Crystal structure of [5,5′-((propane-1,3-diylbis(azanylylidene))bis(ethan-1-yl-2-ylidene))bis(3-(ethoxycarbonyl)-2,4-dimethylpyrrol-1-ido)-κ4N,N′,N′′,N′′′]nickel(II), C23H30N4O4Ni

Abstract C23H30N4O4Ni, triclinic, P1̄ (no. 2), a = 7.5883(9) Å, b = 12.3110(15) Å, c = 12.7718(15) Å, α = 95.621(2)°, β = 99.908(2)°, γ = 101.30(2)°, V = 1141.8(2) Å3, Z = 2, R gt(F) = 0.0433, wR ref(F 2) = 0.1239, T = 296 K

Study on the Vibration and Sound Radiation Performance of Micro-Perforated Laminated Cylindrical Shells

In response to the problem of vibration and noise reduction in equipment with cylindrical shell structures, this paper focuses on the micro-perforated laminated cylindrical shell structure and establishes its finite element model. Through comparative analysis with experimental results, the reliability of the finite element modeling method is verified. Based on this, the paper places particular emphasis on the vibration and acoustic radiation performance of the structure in the 1–1000 Hz frequency range under free conditions to understand the impact of different laminated shell structures, micro-perforation parameters (porosity, aperture), sound-absorbing foam materials, and placement methods. The results indicate that micro-perforated structures can efficiently reduce the structural radiated sound power level at specific frequencies, but the overall reduction in radiated sound power level is not significant. Various types of foam are effective in reducing the structural radiation acoustic power level, with polyurethane performing best among them. Changing the location of foam placement has a relatively insignificant impact on the structural radiation acoustic power level.© 2023 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).fi=vertaisarvioitu|en=peerReviewed

Experimental study on the principle of minimal work fluctuations

The central quantity in the celebrated quantum Jarzynski equality is $e^{-\beta W}$, where $W$ is work and $\beta$ is the inverse temperature. The impact of quantum randomness on the fluctuations of $e^{-\beta W}$ and hence on the predictive power of the Jarzynski estimator is an important problem. Working on a single nitrogen-vacancy center in diamond and riding on an implementation of two-point measurement of non-equilibrium work with single-shot readout, we have conducted a direct experimental investigation of the relationship between the fluctuations of $e^{-\beta W}$ and adiabaticity of non-equilibrium work protocols. It is observed that adiabatic processes minimize the variance of $e^{-\beta W}$, thus verifying an early theoretical concept, the so-called principle of minimal work fluctuations. Furthermore, it is experimentally demonstrated that shortcuts-to-adiabaticity control can be exploited to minimize the variance of $e^{-\beta W}$ in fast work protocols. Our work should stimulate further experimental studies of quantum effects on the bias and error in the estimates of free energy differences based on the Jarzynski equality

MiR-143 enhances adipogenic differentiation of 3T3-L1 cells through targeting the coding region of mouse pleiotrophin

AbstractAdipogenic differentiation of preadipocytes is a complex process regulated by various factors including miRNAs and cytokines. MiR-143 is a well known miRNA that enhances adipogenesis. Pleiotrophin (PTN), a heparin-binding growth factor, plays a negative role in adipogenesis. In this investigation, we demonstrate that PTN is a target gene of miR-143 during adipogenic differentiation in 3T3-L1 preadipocytes. MiR-143 down regulates PTN expression through interaction with a target site of miR-143 in the coding region of mouse PTN. The rare codons upstream of the target site regulate miR143-induced translational knockdown of PTN, which provides more insight into the mechanism of adipogenic differentiation

Band Structure Engineering of Interfacial Semiconductors Based on Atomically Thin Lead Iodide Crystals

To explore new constituents in two-dimensional materials and to combine their best in van der Waals heterostructures, are in great demand as being unique platform to discover new physical phenomena and to design novel functionalities in interface-based devices. Herein, PbI2 crystals as thin as few-layers are first synthesized, particularly through a facile low-temperature solution approach with the crystals of large size, regular shape, different thicknesses and high-yields. As a prototypical demonstration of flexible band engineering of PbI2-based interfacial semiconductors, these PbI2 crystals are subsequently assembled with several transition metal dichalcogenide monolayers. The photoluminescence of MoS2 is strongly enhanced in MoS2/PbI2 stacks, while a dramatic photoluminescence quenching of WS2 and WSe2 is revealed in WS2/PbI2 and WSe2/PbI2 stacks. This is attributed to the effective heterojunction formation between PbI2 and these monolayers, but type I band alignment in MoS2/PbI2 stacks where fast-transferred charge carriers accumulate in MoS2 with high emission efficiency, and type II in WS2/PbI2 and WSe2/PbI2 stacks with separated electrons and holes suitable for light harvesting. Our results demonstrate that MoS2, WS2, WSe2 monolayers with very similar electronic structures themselves, show completely distinct light-matter interactions when interfacing with PbI2, providing unprecedent capabilities to engineer the device performance of two-dimensional heterostructures.Comment: 36 pages, 5 figure

Floquet Mechanism for Non-Abelian Fractional Quantum Hall States

Exotic non-Abelian quasiparticles are believed to occur in certain fractional quantum Hall (FQH) states when effective three-body correlations form between spin-polarized electrons in the first excited Landau level. Inspired by recent observations of exotic physics from Floquet engineering, we investigate periodic driving of anisotropic two-body interactions as an alternative route for realizing robust non-Abelian multicomponent FQH states. We develop an analytic formalism to describe this Floquet FQH protocol, which is distinct from previous proposals that modulate single-body hoppings for bandstructure engineering. Our Floquet mechanism is shown to lead to highly-tunable three-body interactions that can be repulsive as well as attractive. We systematically analyze the resulting interactions with generalized pseudopotentials, and numerically demonstrate that they support a variety of non-Abelian multicomponent FQH phases. Finally, we propose a realistic implementation of our Floquet mechanism in optically dressed ultracold polar molecules with modulated Rabi frequencies