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Electric dehydration is an efficient method for breaking stable water-in-oil emulsions, with higher recorded dehydration rates under coupled electric and magnetic fields when compared to a single electric field. However, the underlying mechanisms for droplet deformation and movement under coupling fields are still unclear. Herein, the deformation characteristics of single droplets under coupled high-voltage electric and magnetic fields were experimentally investigated through a high-speed camera system. The results indicated deformation degrees of droplets directly proportional to the electric field intensity, while droplet size showed little impact on droplet deformation. The degree of droplet deformation is affected by the magnetic field. Compared to under a single electric field, the deformation of droplets decreases under the coupled fields. Comparison of droplets' movements under coupled electric and magnetic fields revealed 3.4-fold higher horizontal movement of droplets under an alternating current (AC)-electro-magnetic coupling field than under a single AC field. The polarized electromagnetic force was obtained by analyzing the forces applied on the droplet under coupled fields. The water content of the oil after dehydration under coupled fields was less than 1 % compared to 4.7 % under a single electric field, confirming the advantages of coupled fields. Overall, these data look potential for improving crude oil dehydration efficiency and reducing energy consumption.

To improve the coverage of recommendation results and reduce the MEA value, the paper proposes an adaptive recommendation method for music resources based on LDA-MURE model. Firstly, remove and reduce the dimensionality of music resource data, and then integrate multimodal feature fusion methods with attention networks to classify the processed music resources. Then, the strength of emotional energy and emotional positivity are introduced to estimate the human emotional state. Finally, the distribution and emotional state estimation results of different types of music themes are input into LDA-MURE model, and music resources are recommended for users based on their emotional states. According to the experiment, MEA index value of this method is always controlled within 0.2, with a coverage rate between 0.944 and 0.971, indicating that the application of this method can recommend more music resources of different types and styles, and the accuracy of the recommendation results is high.

Supramolecular chemistry in aqueous media is an area with great fundamental and practical significance. To examine the role of multiple noncovalent interactions in controlled assembling and binding behavior in water, the self-association of five water-soluble hexakis(m-phenylene ethynylene) (m-PE) macrocycles, along with the molecular recognition behavior of the resultant assemblies, is investigated with UV–vis, fluorescence, CD, and NMR spectroscopy, mass spectrometry, and computational studies. In contrast to their different extents of self-aggregation in organic solvents, all five macrocycles remain aggregated in water at concentrations down to the micromolar (μM) range. CD spectroscopy reveals that 1-F6and 1-H6, two macrocycles carrying chiral side chains and capable of H-bonded self-association, assemble into tubular stacks. The tubular stacks serve as supramolecular hosts in water, as exemplified by the interaction of macrocycles 1-H6and 2-H6and guests G1through G4, each having a rod-like oligo(p-phenylene ethynylene) (p-PE) segment flanked by two hydrophilic chains. Fluorescence and 1H NMR spectroscopy revealed the formation of kinetically stable, discrete assemblies upon mixing 2-H6and a guest. The binding stoichiometry, determined with fluorescence, 1H NMR, and ESI-MS, reveals that the discrete assemblies are novel pseudorotaxanes, each containing a pair of identical guest molecules encased by a tubular stack. The two guest molecules define the number of macrocyclic molecules that comprise the host, which curbs the “infinite” stack growth, resulting in a tubular stack with a cylindrical pore tailoring the length of the p-PE segment of the bound guests. Each complex is stabilized by the action of multiple noncovalent forces including aromatic stacking, side-chain H-bonding, and van der Waals interactions. Thus, the interplay of multiple noncovalent forces aligns the molecules of macrocycles 1and 2into tubular stacks with cylindrical inner pores that, upon binding rod-like guests, lead to tight, discrete, and well-ordered tubular assemblies that are unprecedented in water.