ABSTRACT3D moment invariants are important tools for 3D image feature representation. In this paper, we introduced a novel approach for constructing 3D moment invariants using Gaussian geometric ...moments. Our proposed method demonstrated invariance under translation, rotation, and scale transformations. The numerical experiments validate the invariance and robustness of the proposed method, comparing it with traditional 3D geometric moments and revealing superior performance in the presence of noise and transformations. Additionally, the method is applied to content-based 3D image retrieval, exhibiting promising results through Minkowski distance-based retrieval on the Princeton Shape Benchmark (PSB) database.
Lab-on-chip technologies are being developed for multiplexed single cell assays. Impedance offers a simple non-invasive method for counting, identifying and monitoring cellular function. A number of ...different microfluidic devices for single cell impedance have been developed. These have potential applications ranging from simple cell counting and label-free identification of different cell types or detecting changes in cell morphology after invasion by parasites. Devices have also been developed that trap single cells and continuously record impedance data. This technology has applications in basic research, diagnostics, or non-invasively probing cell function at the single-cell level. This review will describe the underlying principles of impedance analysis of particles. It then describes the state-of-the-art in the field of microfluidic impedance flow cytometry. Finally, future directions and challenges are discussed.
With the rapid advancement of artificial intelligence technology and the widespread use of sensing technology in education, human-computer interaction teaching has gradually developed in sports and ...education. Traditionally, teachers explain and demonstrate the fundamentals of movements first, then organize exercises, and students gradually consolidate technical movements through repetition. This process requires teachers to repeatedly explain, such that students can develop movement concepts, and to assist students in correcting their movements through practice. Eventually, students can master the dragon boat’s paddling movements. Teachers frequently struggle to observe all of their students’ movements and are therefore unable to correct them in a timely and effective manner. To address the aforementioned issues, this paper proposes a big data system for multidimensional stereo vision training in dragon boat paddling action. The stock price action recognition of dragon boat paddles and the movement of students’ dragon boat paddles are realized through the multidimensional fusion of attention mechanism and spatiotemporal graph convolution. Make judgments to more effectively guide and train students’ paddling movements.
Hydrogels have promising applications in diverse areas, especially wet environments including tissue engineering, wound dressing, biomedical devices, and underwater soft robotics. Despite strong ...demands in such applications and great progress in irreversible bonding of robust hydrogels to diverse synthetic and biological surfaces, tough hydrogels with fast, strong, and reversible underwater adhesion are still not available. Herein, a strategy to develop hydrogels demonstrating such characteristics by combining macroscale surface engineering and nanoscale dynamic bonds is proposed. Based on this strategy, excellent underwater adhesion performance of tough hydrogels with dynamic ionic and hydrogen bonds, on diverse substrates, including hard glasses, soft hydrogels, and biological tissues is obtained. The proposed strategy can be generalized to develop other soft materials with underwater adhesion.
Tough hydrogels with fast, strong, and reversible underwater adhesion are developed by combining a clingfish‐inspired macroscale surface structure and nanoscale dynamic bonds. The surface structure accelerates water drainage, prevents water trapping and delays crack propagation; the dynamic bonds of the gel form reversible bridges at the interface and dissipate a significant amount of energy in bulk during detachment.
The size and extent of folding of the mammalian cerebral cortex are important factors that influence a species' cognitive abilities and sensorimotor skills. Studies in various animal models and in ...humans have provided insight into the mechanisms that regulate cortical growth and folding. Both protein-coding genes and microRNAs control cortical size, and recent progress in characterizing basal progenitor cells and the genes that regulate their proliferation has contributed to our understanding of cortical folding. Neurological disorders linked to disruptions in cortical growth and folding have been associated with novel neurogenetic mechanisms and aberrant signalling pathways, and these findings have changed concepts of brain evolution and may lead to new medical treatments for certain disorders.
Traditional piano teaching usually focuses on students’ mastery of music skills and music theory, but neglects the cultivation of students’ musical expression and creativity. In this paper, the ...multiple intelligence theory is used as the guiding theory, and the multiple hybrid teaching model of the piano course is established by combining the flipped classroom. The Fuzzy-CDF model is introduced to quantify students’ piano music cognitive level, the Apriori algorithm is used to generate piano music knowledge point sequences, and multiple algorithms are used to collaborate on personalized recommendations of piano music knowledge resources for students. For the application effect of the piano music multivariate hybrid teaching model established in this paper, a teaching experiment was conducted to analyze it with H Music Academy as an example. The results show that the combined ability of song arrangement and playing and singing of the experimental class improved by 9.74 and 11.10 points respectively compared with the performance of the control class, and the average value of the difference between the pre-and post-tests of the experimental class’s note recognition ability compared with that of the control class reached 5.8 points. The application of Multiple Intelligences Theory can stimulate the individual’s sensitivity to timbre, pitch, and meter, fully enhance students’ musical expression and creativity, and make piano learning more effective.
2D transition metal chalcogenides have attracted tremendous attention due to their novel properties and potential applications. Although 2D transition metal dichalcogenides are easily fabricated due ...to their layer‐stacked bulk phase, 2D transition metal monochalcogenides are difficult to obtain. Recently, a single atomic layer transition metal monochalcogenide (CuSe) with an intrinsic pattern of nanoscale triangular holes is fabricated on Cu(111). The first‐principles calculations show that free‐standing monolayer CuSe with holes is not stable, while hole‐free CuSe is endowed with the Dirac nodal line fermion (DNLF), protected by mirror reflection symmetry. This very rare DNLF state is evidenced by topologically nontrivial edge states situated inside the spin–orbit coupling gaps. Motivated by the promising properties of hole‐free honeycomb CuSe, monolayer CuSe is fabricated on Cu(111) surfaces by molecular beam epitaxy and confirmed success with high resolution scanning tunneling microscopy. The good agreement of angle resolved photoemission spectra with the calculated band structures of CuSe/Cu(111) demonstrates that the sample is monolayer CuSe with a honeycomb lattice. These results suggest that the honeycomb monolayer transition metal monochalcogenide can be a new platform to study 2D DNLFs.
2D transition metal chalcogenides are attracting tremendous attention due to their novel properties and potential applications. Monolayer honeycomb CuSe on Cu(111) is successfully fabricated. First‐principles calculations show that free‐standing monolayer CuSe is endowed with the Dirac nodal line fermion, protected by mirror reflection symmetry. It is further evidenced by topologically nontrivial edge states situated inside the spin–orbit coupling gaps.
A hydrogenation of N‐heterocycles mediated by diboronic acid with water as the hydrogen atom source is reported. A variety of N‐heterocycles can be hydrogenated with medium to excellent yields within ...10 min. Complete deuterium incorporation from stoichiometric D2O onto substrates further exemplifies the H/D atom sources. Mechanism studies reveal that the reduction proceeds with initial 1,2‐addition, in which diboronic acid synergistically activates substrates and water via a six‐membered ring transition state.
No metal necessary: An unprecedented expeditious hydrogenation of N‐heterocycles mediated by diboronic acid with water as hydrogen atom source was reported. Mechanism studies revealed that the reduction proceeds with a successive 1,2‐addition, in which diboronic acid synergistically activates substrates and water via a six‐membered ring transition state.
Black phosphorus (BP), an elemental semiconductor, has attracted tremendous interest because it exhibits a wealth of interesting electronic and optoelectronic properties in equilibrium condition. The ...nonequilibrium electronic structures of bulk BP under a periodic field of laser remain unexplored, but can lead to intriguing topological optoelectronic properties. Here we show that, under the irradiation of circularly polarized light (CPL), BP exhibits a photon-dressed Floquet-Dirac semimetal state, which can be continuously tuned by changing the direction, intensity, and frequency of the incident laser. The topological phase transition from type-I to type-II Floquet-Dirac fermions manifests a new form of type-III phase, which exists in a wide range of intensities and frequencies of the incident laser. Furthermore, topological surface states exhibit nonequilibrium electron transport in a direction locked by the helicity of CPL. Our findings not only deepen our understanding of fundamental properties of BP in relation to topology but also extend optoelectronic device applications of BP to the nonequilibrium regime.
PDF
