Hybrid spin-mechanical setups offer a versatile platform for quantum science and technology, but improving the spin-phonon as well as the spin-spin couplings of such systems remains a crucial ...challenge. Here, we propose and analyze an experimentally feasible and simple method for exponentially enhancing the spin-phonon and the phonon-mediated spin-spin interactions in a hybrid spin-mechanical setup, using only linear resources. Through modulating the spring constant of the mechanical cantilever with a time-dependent pump, we can acquire a tunable and nonlinear (two-phonon) drive to the mechanical mode, thus amplifying the mechanical zero-point fluctuations and directly enhancing the spin-phonon coupling. This method allows the spin-mechanical system to be driven from the weak-coupling regime to the strong-coupling regime, and even the ultrastrong coupling regime. In the dispersive regime, this method gives rise to a large enhancement of the phonon-mediated spin-spin interactions between distant solid-state spins, typically two orders of magnitude larger than that without modulation. As an example, we show that the proposed scheme can apply to generating entangled states of multiple spins with high fidelities even in the presence of large dissipations.
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The direct functionalization of CH bonds is an attractive strategy in organic synthesis. Although several advances have been made in this area, the selective activation of inert sp3 CH bonds ...remains a daunting challenge. Recently, a new type of sp3 CH activation mode through internal hydride transfer has demonstrated the potential to activate remote sp3 CH linkages in an atom‐economic manner. This Minireview attempts to classify recent advances in this area including the transition to non‐activated sp3 CH bonds and asymmetric hydride transfers.
Do it the redox‐neutral way: A hydride transfer process can occur between an sp3 CH bond and a suitably located internal oxidative functional group, leading to a putative zwitterionic intermediate. This intermediate may then undergo cyclization or suffer capture by an external nucleophile, providing CH functionalization products (see scheme). The synthetic value and state‐of‐the‐art of these recently rediscovered strategies is exposed and discussed in this Minireview.
Gigantic coordination molecules assembled from a large number of metal ions and organic ligands are structurally and functionally challenging to characterize. Here we show that a heterometallic ...cluster Ni36Gd102(OH)132(mmt)18(dmpa)18(H2dmpa)24(CH3COO)84(SO4)18(NO3)18(H2O)30·Br6(NO3)6·(H2O) x ·(CH3OH) y , (1, x ≈ 130, y ≈ 60), shaped like a “Star of David”, can be synthesized using a “mixed-ligand” and “sulfate-template” strategy. In terms of metal nuclearity number, 1 is the second largest 3d–4f cluster to date. In the solid state, 1 is porous after removing the lattice guests. The N2 adsoption experiment reveals that the BET and Langmuir surface areas are 299.8 and 412.0 cm2 g–1, respectively. CO2 adsorption at 298 K gives the amount of 45 cm3 g–1 for 1. More importantly, 1 is soluble in common organic solvents and exhibits high solution stability revealed by high resolution MALDI-TOF mass spectroscopy, small-angle X-ray scattering (SAXS), and low-dose transmission electron microscopy. The solubility and the potential open metal sites owing to the labile coordinating components prompted us to investigate the photocatalytic properties of 1, which displays high selectivity and efficiency for reduction of CO2 to CO with turnover number and turnover frequency of 29700 and 1.2 s–1, respectively. These values are higher than most catalysts working under the same conditions, presumably due to the strong Ni–CO2 binding effect. In addition, the large percentage of Gd(III) in 1 leads to a large magnetic entropy change (41.3 J·kg–1·K–1) at 2.0 K for ΔH = 7 T.
In recent times, the role of the regional economy changed significantly under certain conditions of globalization and structural adjustment. The process of changing must be crucial to analyse ...regional economy and develop the planning of regional economy. Developing economies depend often on industries and country policies. Modern studies tend to participate in important factors in this field such as energy intensity, labour skills, local industries, resources, and local expertise. Furthermore, in this study, to start developing the regional economy and make the revolution in this field to connect it with new technology, we train the deep learning algorithm of gathering factors to manage them perfectly and make a good prediction for the future economy. Hybrid sequence to sequence (seq2seq) algorithms of deep learning fed with previous information from past years and run the system to compare the predicted result data with current information to evaluate the method to be certified for the coming years.
This study delves into the digital preservation of Meishan folk woodcarvings, emphasizing the use of virtual reality (VR) technology to enhance the transmission of this traditional art. Utilizing 3D ...modeling and VR platforms, the research scans and rebuilds wooden carvings for digital exhibition. The realism and interactivity of the virtual environment are improved through collision detection algorithms such as Orientation Bracketing Box (OBB) and Axial Bracketing Box (AABB), complemented by high-precision 3D models created with LIDAR scanning technology. Findings indicate that the VR system significantly enhances the efficiency and quality of digital preservation, offering a robust solution for safeguarding Meishan folk woodcarvings.
Tantou woodblock prints are traditional Chinese woodblock prints with a long history. Adding modern information technology elements to the excellent traditional culture can better combine regional ...contemporary woodblock prints and realize the cultural heritage. In this paper, from the perspective of modern informatization inheritance, we propose a way of displaying Tantou woodblock prints with AR enhancement technology, which breaks the limitation of physical experience with the help of virtual technology and improves the immersive experience of Tantou woodblock prints by combining with visual SLAM spatial localization technology. Based on the KANO model, the inheritance effect of Tantou woodblock prints was empirically analyzed. The data of Q, A, I, R, M, and O of the satisfaction results of the experience effect of Tantou woodblock prints were 1.132, 3.034, 2.828, 1.422, 1.237, and 0.978, which belonged to the excitatory type of demand. The inheritance satisfaction could be improved by enhancing the natural experience effect. The percentage of experiencers’ satisfaction with the information acquisition rate of Tantou Wooden Plank New Year’s Paintings that reaches excellent and above is 82.35%, and this paper effectively captures the user’s experience point in the visual, which contributes to the inheritance of Tantou Wooden Plank New Year’s Paintings.
Smart textiles exhibiting optical response to external temperature stimuli are promising functional materials for a wide range of applications. It is critical yet challenging to endow these materials ...with high‐contrast, vivid, and real‐time optical signals, such as changes in color or fluorescent emission, for the indication of heating and/or cooling. A thermoresponsive dye system featuring simultaneous thermochromism and thermofluorescence is developed and applied to dyeing of polyester fabrics. The dye system is constructed by encapsulating a solution of indenoquinacridone (IQA) in aliphatic alcohol into SiO2 nanoparticles. The dual‐output response relies on the mechanism of solvent‐modulated dissociation/aggregation of the IQA molecules. Upon heating, the dye system and the dyed fabric exhibit clear color change and high‐contrast, turned‐on fluorescence, in a real time and highly reversible manner. The thermoresponsive temperature can be tailored by varying the aliphatic alcohol solvent with different melting point. The integration of high‐contrast dual optical outputs into this programmable, robust, and reversible dye system lays the foundation for its employment in a wide range of challenging applications in smart textiles.
Solvent‐modulated dissociation/aggregation of a quinacridone derivative leads to simultaneous thermochromism and thermofluorescence. After encapsulation into SiO2 nanoparticles, the system can be dyed into polyester fabrics. Upon heating, the dyed textiles exhibit clear color change and high‐contrast, turned‐on fluorescence, in a real‐time and highly reversible manner. The thermoresponsive temperature can be programmed by varying the solvent component of the system.
We propose an experimentally feasible method for enhancing the atom-field coupling as well as the ratio between this coupling and dissipation (i.e., cooperativity) in an optical cavity. It exploits ...optical parametric amplification to exponentially enhance the atom-cavity interaction and, hence, the cooperativity of the system, with the squeezing-induced noise being completely eliminated. Consequently, the atom-cavity system can be driven from the weak-coupling regime to the strong-coupling regime for modest squeezing parameters, and even can achieve an effective cooperativity much larger than 100. Based on this, we further demonstrate the generation of steady-state nearly maximal quantum entanglement. The resulting entanglement infidelity (which quantifies the deviation of the actual state from a maximally entangled state) is exponentially smaller than the lower bound on the infidelities obtained in other dissipative entanglement preparations without applying squeezing. In principle, we can make an arbitrarily small infidelity. Our generic method for enhancing atom-cavity interaction and cooperativities can be implemented in a wide range of physical systems, and it can provide diverse applications for quantum information processing.
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