Interaction between Hosts and Guests of Rural Tourism in Northeast China Based on Symbolic Interaction Theory

With constant economic development and continuous improvement of living standards in Northeast China,rural tourism,as a new type of tourism,is increasingly favored. From the perspective of symbolic interaction theory,taking the current situation of rural tourism in Northeast China as an example,this paper explained the semiotic significance between hosts and guests in rural tourism. It established the evaluation indicators for authentic symbolic perception of rural tourism. Also,combined with the theories of sociology and anthropology,it studied the interaction between hosts and tourists of rural tourism in Northeast China.

Quantitative prediction of the bitterness of atomoxetine hydrochloride and taste-masked using hydroxypropyl-β-cyclodextrin:A biosensor evaluation and interaction study

The bitterness of a drug is a major challenge for patient acceptability and compliance,especially for children.Due to the toxicity of medication,a human taste panel test has certain limitations.Atomoxetine hydrochloride(HCl),which is used for the treatment of attention deficit/hyperactivity disorder(ADHD),has an extremely bitter taste.The aim of this work is to quantitatively predict the bitterness of atomoxetine HCl by a biosensor system.Based on the mechanism of detection of the electronic tongue(Etongue),the bitterness of atomoxetine HCl was evaluated,and it was found that its bitterness was similar to that of quinine HCl.The bitterness threshold of atomoxetine HCl was 8.61μg/ml based on the Change of membrane Potential caused by Adsorption(CPA)value of the BT0 sensor.In this study,the taste-masking efficiency of 2-hydroxypropyl-β-cyclodextrin(HP-β-CyD)was assessed by Euclidean distances on a principle component analysis(PCA)map with the SA402B Taste Sensing System,and the host–guest interactions were investigated by differential scanning calorimetry(DSC),powder X-ray diffraction(XRD),nuclear magnetic resonance(NMR)spectroscopy and scanning electron microscopy(SEM).Biosensor evaluation and characterization of the inclusion complex indicated that atomoxetine HCl could actively react with 2-hydroxypropyl-β-cyclodextrin.

Supramolecular Nanohelix Fabricated by Pillararene-Based Host–Guest System for Chirality Amplification, Transfer, and Circularly Polarized Luminescence in Water

Amplified chirality and Förster resonance energy transfer(FRET)-assisted chirality transfer frommolecular to nanoscale level have been shown to play a vital role in co-assembled nanohelix for potential energy transfer in biological systems.Herein,we have constructed a chiral host–guest complex donor system for chiral amplification via induced chirality of pillar[5]arene host and loaded it with an achiral dye acceptor to demonstrate how chirality-assisted excitation energy transfer occurred in the supramolecular nanohelix system in an aqueous medium.

旅游跨文化学习中的主客互动——阳朔太极拳的教与学

中国传统文化的传播对于实现文化自信具有重要意义。本文关注了近年火热的“外国人赴阳朔学太极”现象,综合运用非参与式观察法、深度访谈法与文本分析法,以“身体符号”的意义变迁为研究脉络,探讨“外国人学太极”这一跨文化情境下的主客互动活动,分析外国人赴阳朔学太极的动因、互动过程与内在机制。研究发现:从互动媒介来看,身体作为符号在跨文化情境中发挥着重要的媒介作用,身体符号的意义也在跨文化互动中逐渐深化;从互动过程来看,不同主体的角色和观念以身体符号为媒介在跨文化互动中实现交互协商,由此加深主体对于自我的认知。人与人之间的学习型紧密联结强化了人与地方之间的关系。

Rational fabrication of ordered porous solid strong bases by utilizing the inherent reducibility of metal-organic frameworks

Ordered porous solid strong bases(OPSSBs)have attracted great research interest due to the excellent performance as heterogeneous catalysts in various reactions.The main obstacle for fabricating OPSSBs is the requirement of high temperature to produce strong basicity on ordered porous materials.For example,the temperatures of 600-650℃ are required for the decomposition of base precursor NaNO_(3)to basic sites on mesoporous silica SBA-15 and zeolite Y.Such high decomposition temperatures are energy-intensive and harmful to the structure of supports.Herein,we report the fabrication of OPSSBs by utilizing the redox interaction between base precursor and low-valence metal centers(e.g.,Cr^(3+))in metal-organic frameworks(MOFs).The base precursor NaNO_(3)on MIL-101(Cr)can be converted to basic sites entirely at 300℃,which is quite lower than those of the conventional thermal conversion on SBA-15 and zeolite Y(600-650℃).The exploration on decomposition mechanism reveals that the valence change of Cr^(3+)to Cr^(6+)takes place during the conversion of NaNO_(3)to basic sites.In this way,MOFs-derived base catalysts have been synthesized successfully by the host-guest redox strategy and exhibit high catalytic activity in typical base-catalyzed reactions.

Synergistic modulation of spin and fluorescence signals in a nano-Saturn assembled by a metallofullerene and cycloparaphenylene nanohoop

Spin-based interdisciplinary research has attracted considerable attention,and various applications in magnetic memory,quantum science,and precision measuring technology have been reported.In this study,we induced a fluorescence property in a spin-active molecule by supramolecular assembly and realized a synergistic modulation of its spin and fluorescence properties.A Saturn-shaped supramolecular complex was synthesized using a spin-active metallofullerene Sc_(3)C_(2)@C80 with a fluorescent nanohoop of tetra-benzothiadiazole-based[12]cycloparaphenylene(TB[12]CPP),and its spin and fluorescence properties were comprehensively investigated.Temperature-dependent electron paramagnetic resonance(EPR)spectroscopy and fluorescence analyses were conducted.Synchronous changes in the EPR signals and fluorescence peaks were discovered in the temperature range of 170–290 K.Based on nuclear magnetic resonance observations and theoretical calculations,a temperature-dependent host–guest interaction between Sc_(3)C_(2)@C_(80)and a nanohoop was demonstrated,which explained the synchronous changes in the EPR signals and fluorescence peaks for Sc_(3)C_(2)@C_(80)⊂TB[12]CPP.The application of Sc_(3)C_(2)@C_(80)as a molecular spin system to probe the host–guest interaction was also evaluated.These results show that the supramolecular assembly can be used to design advanced spin systems coupled with optical and magnetic behaviors based on paramagnetic and luminescent molecules.

Efficient Photocatalytic Reduction of CO_(2)Catalyzed by the Metal–Organic Framework MFM-300(Ga)

Photocatalytic reduction of CO_(2)to carbon fuels is an important target but highly challenging to achieve.Here,we report the efficient photoconversion of CO_(2)into formic acid over a Ga(Ⅲ)-based metal–organic framework(MOF)material using triethanolamine as the sacrificial agent.Under light irradiation and at room temperature,photoreduction of CO_(2) over MFM-300(Ga)yields formic acid with a selectivity of 100%.