503 research outputs found

    A summary of the research on tourism public service system in ancient cities and towns in China

    Get PDF
    This paper collates and analyzes the ancient town tourism, tourism public service, ancient town tourism public service system and relevant research literature. It is found that Chinese scholars have begun to try to systematically study the ancient town tourism public service system, but the research on China’s ancient town tourism public service system has some problems, such as narrow research scope, theoretical research lagging behind practice, and then puts forward the direction that needs to be discussed in depth in the future.

    Research progress on property and application of theaflavins

    Get PDF
    Theaflavins is a group of very important material from black tea with functions as antioxidant, cancer suppressor and inhibitor of pathogenic microorgnisms. A discription is given on the property, chemical structure and application of theaflavin in this paper. The present research situation of theaflavins both in China and abroad is also reviewed.Keywords: Theaflavins, property, applicatio

    Intelligent management system design for tourism, cultural and creative industrial park—Take the traditional district of Wudian City in Jinjiang as an example

    Get PDF
    Taking Jinjiang Wudian City Tourism Cultural and Creative Industrial Park as the research object, we use the case study method to explore the intelligent management system design scheme of the tourism cultural and creative industrial park, and through field interviews, data collection, data coding and result analysis, we deeply analyze the tourism cultural and creative industrial park in Jinjiang Wudian City. Through the methods of field interviews, data collection, coding and result analysis, we analyze the management subjects and components of the management mode of Wudian City Tourism and Creative Industry Park in Jinjiang and identify its existing management mode. On this basis, it embeds technical elements of wisdom tourism, subdivides wisdom management composition modules of tourism cultural and creative industrial park, and finally forms a complete wisdom tourism management system of tourism cultural and creative industrial park

    Gelechiidae Moths Are Capable of Chemically Dissolving the Pollen of Their Host Plants

    Get PDF
    Background: Many insects feed on pollen surface lipids and contents accessible through the germination pores. Pollen walls, however, are not broken down because they consist of sporopollenin and are highly resistant to physical and enzymatic damage. Here we report that certain Microlepidoptera chemically dissolve pollen grains with exudates from their mouthparts. Methodology/Principal Findings: Field observations and experiments in tropical China revealed that two species of Deltophora (Gelechioidea) are the exclusive pollinators of two species of Phyllanthus (Phyllanthaceae) on which their larvae develop and from which the adults take pollen and nectar. DNA sequences placed the moths and plants phylogenetically and confirmed that larvae were those of the pollinating moths; molecular clock dating suggests that the moth clade is younger than the plant clade. Captive moths with pollen on their mouthparts after 2-3 days of starvation no longer carried intact grains, and SEM photographs showed exine fragments on their proboscises. GC-MS revealed cis-b-ocimene as the dominant volatile in leaves and flowers, but GC-MS analyses of proboscis extracts failed to reveal an obvious sporopollenindissolving compound. A candidate is ethanolamine, which occurs in insect hemolymphs and is used to dissolve sporopollenin by palynologists. Conclusions/Significance: This is the first report of any insect and indeed any animal chemically dissolving pollen

    Cloud Model Bat Algorithm

    Get PDF
    Bat algorithm (BA) is a novel stochastic global optimization algorithm. Cloud model is an effective tool in transforming between qualitative concepts and their quantitative representation. Based on the bat echolocation mechanism and excellent characteristics of cloud model on uncertainty knowledge representation, a new cloud model bat algorithm (CBA) is proposed. This paper focuses on remodeling echolocation model based on living and preying characteristics of bats, utilizing the transformation theory of cloud model to depict the qualitative concept: “bats approach their prey.” Furthermore, Lévy flight mode and population information communication mechanism of bats are introduced to balance the advantage between exploration and exploitation. The simulation results show that the cloud model bat algorithm has good performance on functions optimization

    Dissipative elastic metamaterial with a lowfrequency passband

    Get PDF
    We design and experimentally demonstrate a dissipative elastic metamaterial structure that functions as a bandpass filter with a low-frequency passband. The mechanism of dissipation in this structure is well described by a mass-spring-damper model that reveals that the imaginary part of the wavenumber is non-zero, even in the passband of dissipative metamaterials. This indicates that transmittance in this range can be low. A prototype for this viscoelastic metamaterial model is fabricated by 3D printing techniques using soft and hard acrylics as constituent materials. The transmittance of the printed metamaterial is measured and shows good agreement with theoretical predictions, demonstrating its potential in the design of compact waveguides, filters and other advanced devices for controlling mechanical waves

    Dissipative elastic metamaterial with a lowfrequency passband

    Get PDF
    We design and experimentally demonstrate a dissipative elastic metamaterial structure that functions as a bandpass filter with a low-frequency passband. The mechanism of dissipation in this structure is well described by a mass-spring-damper model that reveals that the imaginary part of the wavenumber is non-zero, even in the passband of dissipative metamaterials. This indicates that transmittance in this range can be low. A prototype for this viscoelastic metamaterial model is fabricated by 3D printing techniques using soft and hard acrylics as constituent materials. The transmittance of the printed metamaterial is measured and shows good agreement with theoretical predictions, demonstrating its potential in the design of compact waveguides, filters and other advanced devices for controlling mechanical waves
    corecore