Traditional aerobics gesture recognition has shortcomings such as low scalability, limitations in application scenarios, limitations in labor costs, and human–computer interaction. In order to ...improve the efficiency of aerobics posture recognition, based on neural network, this paper constructs aerobics posture recognition model combined with sensor network. Moreover, aiming at the unsatisfactory performance of the natural feature-based visual 3D registration method for scenes with sparse texture features and complex dynamic scenes, a deep neural network based on CNN + LSTM is proposed to establish the relative motion relationship between camera positions in continuous video sequences. In addition, this paper uses the transfer learning method to apply the network training parameters for the classification task to the video sequence posture recognition in this paper. Finally, considering the temporal correlation between video sequences, this paper uses the LSTM structure to store long-term image memory information. The experimental results show that the performance of the model constructed in this paper is good.
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•g-C3N4/Ag2MoO4/Ag3PO4 heterojunction photocatalyst was prepared.•The heterojunction showed enhanced photocatalytic oxygen evolution from water splitting.•The formation of dual ...Z-scheme system promotes the separation of photo-generated charges.
Semiconductor-based solar-driven photocatalytic water splitting has been considered as one of the most promising solutions to solve the problem of fossil-based energy crisis, while the development of advanced photocatalytic materials for high-performance oxygen evolution from water splitting is the biggest challenge we are facing. We report the fabrication of novel g-C3N4/Ag3PO4/Ag2MoO4 ternary composite materials and the exploration of heterostructure materials for water oxidation under LED illumination. The hybridization of three semiconductors has been confirmed by microscopic study, chemical and structural analyses. Enhanced oxygen-producing activity over the obtained ternary composite photocatalysts was observed. The reasons responsible for the enhanced oxygen-evolving performance can be ascribed to the improved light absorption toward visible light, faster charge separation and charge transportation, as well as more powerful water oxidation capability originating from the in-situ construction of dual Z-scheme-type channels under visible light irradiation. The key role of in-situ formed metallic Ag as the electron mediator is suggested based on the theoretical and experimental results. The successful synthesis of fascinating ternary water oxidation photocatalysts provides new insights into the development of novel all-solid-state Z-scheme photocatalytic systems for energy and environmental applications.
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•ZIF-8/g-C3N4 composites with controllable morphologies and interfaces were fabricated.•The composite photocatalyst demonstrates the efficient utilization of visible ...light.•Improvements in charge transportation and redox capability are revealed.•The application of MOF-based composites in photocatalytic water splitting is explored.
The development of low-cost and noble metal-free photocatalytic materials with precisely controlled morphologies and interfaces is vital to achieving highly efficient solar-to-fuel conversion. We herein report the fabrication of novel metal-organic framework (MOF)/g-C3N4 heterostructured materials with well-defined micro-/nanostructures and intimate interfacial contact. Zeolitic imidazolate framework-8 (ZIF-8) nanoparticles are found to be evenly anchored on modified rod-like g-C3N4 materials. The resultant hybrid materials demonstrate the integration of two components and show enhanced light-harvesting property in the visible light region. ZIF-8/g-C3N4 composite materials have been employed as the catalysts for solar-driven photocatalytic hydrogen evolution from water splitting. Under light emitting diode (LED) illumination, ZIF-8/g-C3N4 composite photocatalysts exhibit significant hydrogen-evolving performance in comparison to bulk ZIF-8 material. The enhanced hydrogen production efficiency can be ascribed to synergistic improvements in electron-hole separation, charge transportation and redox capability. This synthetic strategy can be extended to the design and controllable synthesis of a variety of MOF-based composite materials for energy and environmental applications.
Photocatalytic CO2 reduction is considered as an efficient approach to reduce greenhouse effect and overcome energy crisis. Herein, we successfully fabricated 0D/2D Au/TiO2 plasmon Ohmic-junction ...composites, which exhibit excellent photocatalytic activity of CO2 reduction to CH4. The main reduction products of the optimized 0D/2D Au/TiO2 heterojunction are CH4 and CO obtained at the rates of 70.34 and 19.75 μmol·g−1·h−1, respectively, with 80% CH4 selectivity. Transmission electron microscopy, UV–vis diffuse reflection spectra and photo-electrochemical tests along with density functional theory calculations confirm that the improved photocatalytic CO2 reduction performance and high CH4 selectivity are attributed to the synergistic effects between plasmonic Au NPs and Ohmic-junction of Au and TiO2, which can effectively enhance the separation and transportation of photo generated carriers and promote a multi-electron reduction reaction of CO2 and H2O, resulting in high selectivity of CH4 generation. These results also indicate that the Au/TiO2 plasmon Ohmic-junction can act as a highly effective CO2 reduction photocatalyst for future applications of energy conversion.
•Successful fabrication of 0D/2D Au/TiO2 and its utilization to boost photocatalytic activity of CO2 reduction to CH4.•Enhancement in photocatalytic activity of Au/TiO2 through Ohmic-junction and localized surface plasmonic resonance (LSPR).•The DFT calculations agree firmly well with the experimental results.
construction of the Schottky-junction is considered to be a valid route to boost the spatial charge separation and transfer of the photocatalytic system. Herein, two-dimensional (2D) O-doped g-C3N4 ...nanosheets were prepared by an annealing route, and then a 2D/2D Ti3C2 MXene/O-doped g-C3N4 Schottky-junction was fabricated using an in-situ electrostatic assembly of negatively charged Ti3C2 MXene and positively charged O-doped g-C3N4 nanosheets. The as-prepared Ti3C2 MXene/O-doped g-C3N4 Schottky-junction exhibited almost two times enhanced hydrogen evolution (25124 μmol/g/h) in comparison to pristine O-doped g-C3N4 (13745 μmol/g/h) and Ti3C2 MXene/pristine C3N4 (15573 μmol/g/h). Based on fully characterizations and theory calculation, the enhanced photocatalytic performance could be attributed to the synergy effect of intimate 2D/2D interfacial contact and the construction of Schottky-junction, which result in the short charge transport distance from HCN to Ti3C2 MXene and efficient separation of the photo-generated charge. This study will provide new insight into developing 2D/2D Schottky-junction photocatalysts for the solution of the energy crisis.
Ti3C2-MXene, which exhibits excellent electronic conductivity and optical properties, has been identified as a promising noble-metal-free co-catalyst for the development of efficient photocatalysts ...for environmental remediation. Herein, CeO2/Ti3C2-MXene hybrids were prepared by the in-situ growth of cube-like CeO2 using ultrathin Ti3C2-MXene nanosheets as a two-dimensional platform via a simple hydrothermal route. Upon exposure to solar light, the CeO2/Ti3C2-MXene hybrid with the optimal ratio of Ti3C2-MXene exhibited enhanced performance in photocatalytic tetracycline degradation and CO2 reduction, with activities 6.3 and 1.5 times greater than those of pristine CeO2, respectively. The improved activity of CeO2/Ti3C2-MXene was attributed to the Schottky junction induced by the built-in electric field between CeO2 and Ti3C2-MXene, which drives the photogenerated electrons from CeO2 to Ti3C2-MXene and expedites the segregation of the electrons and holes. This work may shed light on the careful design of novel Schottky junctions utilizing noble-metal free Ti3C2-MXene as co-catalysts for building efficient photocatalytic systems enacted in pollutant degradation and energy conversion.
A simple one-step thermal polymerization method was developed for synthesis of holey graphitic carbon nitride nanotubes, involving direct heating of mixtures of melamine and urea or melamine and ...cyanuric acid in specific mass ratios. Supramolecular structures formed between the precursor molecules guided nanotube formation. The porous and nanotubular structure of the nanotubes facilitated efficient charge carrier migration and separation, thereby enhancing photocatalytic H
2
production in 20 vol.% lactic acid under visible light irradiation. Nanotubes synthesized using melamine and urea in a 1:10 mass ratio (denoted herein as CN-MU nanotubes) exhibited a photocatalytic hydrogen production rate of 1,073.6 μmol·h
−1
·g
−1
with Pt as the cocatalyst, a rate of 4.7 and 3.1 times higher than traditional Pt/g-C
3
N
4
photocatalysts prepared from graphitic carbon nitride (g-C
3
N
4
) obtained by direct thermal polymerization of melamine or urea, respectively. On the basis of their outstanding performance for photocatalytic H
2
production, it is envisaged that the holey g-C
3
N
4
nanotubes will find widespread uptake in other areas, including photocatalytic CO
2
reduction, dye-sensitized solar cells and photoelectrochemical sensors.
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The families of MAX phases and their derivatives MXenes are constantly increasing in terms of both composition and crystalline mixtures. In the last three years, numerous advances ...were accomplished that improved the preparation of new MAX phases with prearranged double transition metals and, as a result, the production of novel MXenes with a high structural complexity and chemical multiplicity, infrequently observed in other families of two-dimensional samples. In this evaluation, hybrids of MXenes and semiconductors are efficient photocatalysts, because of their specific interface characteristics and Schottky heterojunction is capable of giving accelerated charge separation and a lower Schottky barrier for photocatalytic applications. The latest advances were proved that the MXenes supported semiconductors based photocatalysts can be expected as the most advantaged and encouraged novel photocatalysts in the photocatalytic and photoelectrochemical applications. Besides, we have explained significant developments in efficient MXenes supported semiconductors based nanocomposites, including the frequent synthesis strategies and progress mechanisms, in addition to their new applications including, photodegradation of dyes, CO2 conversion, photocatalytic and photoelectrochemical water splitting reaction applications. The review was completed with a short presentation of future challenges and prospects in the progress of MXenes supported semiconductors based photocatalysts. It is also believed that this review will encourage further exploration and will inaugurate new promising to increase new MXenes supported semiconductors based photocatalysts with new and inspiring applications.
Growing evidence indicates that RNA methylation plays a fundamental role in epigenetic regulation, which is associated with the tumorigenesis and drug resistance. Among them, acute myeloid leukemia ...(AML), as the top acute leukemia for adults, is a deadly disease threatening human health. Although N7-methylguanosine (m7G) has been identified as an important regulatory modification, its distribution has still remained elusive.
The present study aimed to explore the long non-coding RNA (lncRNA) functional profile of m7G in AML and drug-resistant AML cells. The transcriptome-wide m7G methylation of lncRNA was analyzed in AML and drug-resistant AML cells. RNA MeRIP-seq was performed to identify m7G peaks on lncRNA and differences in m7G distribution between AML and drug-resistant AML cells. The Gene Ontology (GO) and the Kyoto Encyclopedia of Genes and Genomes (KEGG) pathway enrichment analyses were conducted to predict the possible roles and m7G-associated pathway.
Using m7G peak sequencing, it was found that a sequence motif was necessary for m7G methylation in drug-resistant AML lncRNA. Unsupervised hierarchical cluster analysis confirmed that lncRNA m7G methylation occurred more frequently in drug-resistant AML cells than in AML cells. RNA sequencing demonstrated that more genes were upregulated by methylation in drug-resistant AML cells, while methylation downregulated more genes in AML cells. The GO and KEGG pathway enrichment analyses revealed that genes having a significant correlation with m7G sites in lncRNA were involved in drug-resistant AML signaling pathways.
Significant differences in the levels and patterns of m7G methylation between drug-resistant AML cells and AML cells were revealed. Furthermore, the cellular functions potentially influenced by m7G in drug-resistant AML cells were predicted, providing evidence implicating m7G-mediated lncRNA epigenetic regulation in the progression of drug resistance in AML. These findings highlight the involvement of m7G in the development of drug resistance in AML.
Celotno besedilo
Dostopno za:
DOBA, IZUM, KILJ, NUK, PILJ, PNG, SAZU, SIK, UILJ, UKNU, UL, UM, UPUK
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