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作者： Vikih edith Vefemsi 山西大学

学位级别：硕士

旅游业正蓬勃发展,过去七年中全球旅游业保持持续增长。中国旅游业现已发展成为国内经济最重要的支柱产业之一。“旅游目的地形象”这一概念表示游客对特定目的地的综合感知和印象。如今,人们认为良好的旅游目的地形象是带动旅游业发展... 详细信息

旅游业正蓬勃发展,过去七年中全球旅游业保持持续增长。中国旅游业现已发展成为国内经济最重要的支柱产业之一。“旅游目的地形象”这一概念表示游客对特定目的地的综合感知和印象。如今,人们认为良好的旅游目的地形象是带动旅游业发展的重要因素。因此,在旅游业中,旅游目的地形象和沉浸式体验这两个概念获得广泛关注。本研究运用实证主义哲学,基于演绎方法的定量研究,旨在探讨通过提升沉浸体验给旅游目的地形象所带来的影响,并分析通过提升游客的实际用户体验、感知服务质量和感知真实性给旅游目的地形象所带来的间接影响。本研究针对422位旅客通过在线问卷调查的方式收集了与上述变量相关的数据,所有旅客均为到访北京并在旅行期间使用基于地理位置的增强现实技术（LBAR）的人。样本采集针对性强,采样技术便捷。分析结果表明,提升旅客的沉浸式体验不仅对旅游目的地形象影响显著,而且对于旅客的用户体验、感知服务质量和感知真实性给旅游目的地形象所带来的间接影响,影响也较为显著。基于SEM假设检验,证实本研究中提出的所有假设都是正确的。故本研究对于未来旅游业发展以及增强现实技术在旅游业中的应用具有重要意义。

关键词：增强现实技术沉浸式体验旅游目的地形象用户体验感知服务质量感知真实性

Rare earth element geochemistry in soils along arid and semiarid grasslands in northern China

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Ecological Processes 2022年第1期11卷 386-399页

作者： Yi‑Wen Cao Xiao‑Ming Liu Chao Wang edith Bai Nanping Wu CAS Key Laboratory of Forest Ecology and Management Institute of Applied EcologyChinese Academy of SciencesShenyang 110016China University of Chinese Academy of Sciences Beijing 100049China Department of Earth Marine and Environmental SciencesUniversity of North Carolina‑Chapel HillChapel HillNC 27515USA Key Laboratory of Geographical Processes and Ecological Security of Changbai Mountains School of Geographical SciencesNortheast Normal UniversityChangchun 130024China Institute of Deep‑Sea Science and Engineering Chinese Academy of SciencesSanya 572000China

Background:Rare earth elements(REE)are a group of trace elements that behave geochemically *** fractionation patterns normalized to reference materials provide a powerful tool for documenting *** processes are particularly difficult to illustrate with respect to contemporary and past climate *** this study,we characterize the rare earth element(REE)contents in bulk soils and respective geochemical fractions(e.g.,exchangeable,carbonate‑bound,reducible,and oxidizable fractions)and to decipher the relationships between REE geochemistry components and climatic factors across a large‑scale northern China transect(NCT).Results:Across the NCT,bulk REE concentrations ranged from 55.2 to 241.1μg g^(−1)with a main portion in the residual fraction(49–79%),followed by oxidizable fraction(2–40%),reducible fraction(3–22%),carbonate‑bound fraction(0.1–16%),and negligible exchangeable *** REE contents of geochemical components(carbonate‑bound,reducible,and oxidizable)in topsoils correlated to climate factors(mean annual precipitation,mean annual temperature,potential evaporation,and aridity index(AI)).The normalized abundances to the upper continental crust(UCC)composition show that the middle REE was generally enriched than the light REE and heavy REE in topsoils along the *** overall UCC‑normalized bulk REE patterns in topsoils and subsoils were similar,characterized by weak negative Ce anomalies and positive Eu ***:Our data in topsoils and depth profiles collectively suggest that cycling of REE was primarily regulated by abiotic processes in area with AI*** similar UCC normalized patterns in topsoils suggest that the REE was originated from a common source with limited influences from other sources(e.g.,atmospheric dusts and anthropogenic contribu‑tions).Our results to some extent provide evidence for

关键词： Rare earth elements Soil Grassland Northern China Aridity index

Reaction mechanism of azoreductases suggests convergent evolution with quinone oxidoreductases

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Protein & Cell 2010年第8期1卷 780-790页

作者： Ali Ryan Chan-Ju Wang Nicola Laurieri Isaac Westwood edith Sim Department of Pharmacology University of OxfordMansfield RoadOxfordOX13QTUK

Azoreductases are involved in the bioremediation by bacteria of azo dyes found in waste *** the gut flora,they activate azo pro-drugs,which are used for treatment of inflammatory bowel disease,releasing the active component 5-aminosalycilic *** bacterium *** has three azoreductase genes,paAzoR1,paAzoR2 and paAzoR3,which as recombinant enzymes have been shown to have different substrate *** mechanism of azoreduction relies upon tautomerisation of the substrate to the hydrazone *** report here the characterization of the *** azoreductase enzymes,including determining their thermostability,cofactor preference and kinetic constants against a range of their favoured *** expression levels of these enzymes during growth of *** are altered by the presence of azo *** is shown that enzymes that were originally described as azoreductases,are likely to act as NADH quinone *** low sequence identities observed among NAD(P)H quinone oxidoreductase and azoreductase enzymes suggests convergent evolution.

关键词： azoreductase enzyme mechanism NAD(P)H quinone oxidoreductase enzyme characterisation convergent evolution

Formation,stabilization and chemical demulsification of crude oil-in-water emulsions:A review

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Petroleum Research 2022年第4期7卷 459-472页

作者： edith Yonguep Kashala Fabrice Kapiamba Katende Jonathan Kabamba Mahabubur Chowdhury Department of Chemical Engineering Cape Peninsula University of TechnologySymphony WayPO Box 1906Bellville7535Cape TownSouth Africa Department of Civil Architectural and Environmental EngineeringMissouri University of Science and TechnologyRollaMO65401USA

The crude oil recovery process is frequently associated with the formation of stable emulsions due to factors such as turbulent flow in pipelines and the presence of surface-active substances that naturally occur in crude *** emulsions are undesirable for the petroleum industry because their destruction/treatment adds to the overall production cost and causes the loss of valuable amounts of crude ***,it is essential,for economic and environmental reasons,to optimize the crude oil demulsification *** effective treatment of crude oil emulsions requires understanding of the process and factors leading to their formation and *** this sense,suitable treatment methods and possible preventive measures to avoid their formation can be *** present study reviews recent oilfield emulsion types and the factors responsible for their formation and *** different demulsification techniques employed were then extensively *** tech-niques include mechanical,thermal,electrical,and chemical methods with different demulsification mechanisms affected by many factors such as emulsions type and properties,demulsifiers characteris-tics,presence of solids stabilized emulsions,*** demulsification efficiency depends on the operating parameters of the process,the economics involved,and the environmental impact,which are the main factors considered in selecting a suitable demulsification *** research on the demulsifi-cation of crude oil emulsions should focus on real crude oil emulsions studies at a pilot scale level,the effect of aging on crude oil emulsions,the combination of multiple demulsification techniques and their synergistic effects,and the use of natural,ecofriendly demulsifiers.

关键词： Crude oil Enhanced oil recovery Emulsions Stabilization Demulsification Surfactants Demulsifiers Coalescence

Adhesion of PBO Fiber in Epoxy Composites

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Journal of Donghua University(English Edition) 2007年第2期24卷 173-177页

作者： MADER edith MELCHER Steffen 刘建文高尚林 Leibniz Institute of Polymer Research Dresden Hohe Strasse 601069 DresdenGermany

The high mechanical and thermal performance of poly p-phenylene- 2, 6 - benzobisoxazole （ PBO ） fiber provides great potential applications as reinforcement fibers for composites. A composite of PBO fiber and epoxy resin has excellent electrical insulation properties, therefore, it is considered to be the best choice for the reinforcement in high magnetic field coils for pulsed magnetic fields up to 100 T. However, poor adhesion between PBO fiber and matrix is found because of the chemically inactive and/or relatively smooth surface of the reinforcement fiber preventing efficient chemical bonding in the interface, which is a challenging issue to improve mechanical properties. Here, we report the surface modification of PBO fibers by ultraviolet （UV） irradiation, O2 and NH3 plasma, as well as acidic treatments. The interfacial adhesion strength values of all the treatments show the similar level as determined for aramid fibers by pull-out tests, a significant impact on fibermatrix-adhesion was not achieved. The surface free energy and roughness are increased for both sized and extracted fibers after plasma treatments together with maleic anhydride grafting. The sized fiber shows marginal improvement in adhesion strength and no change in fiber tensile strength because of the harrier effect of the finish. For the extracted fiber, different surface treatments either show no apparent effect or cause reduction in adhesion strength. Atomic force microscopy （AFM） topography analysis of the fracture surfaces proved adhesive failure at the fiber surface. The fiber surface roughness is increased and more surface flaws are induced, which could result in coarse interface structures when the treated fiber surface has no adequate wetting and functional groups. The adhesion failure is further confirmed by similar adhesion strength and compression shear strength values when the fiber was embedded in various epoxy resins with different temperature behavior. The tensile strength of fi

关键词： PBO fiber composites interface adhesion

Application of nanotechnologies in the energy sector： A brief and short review

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Frontiers in Energy 2013年第1期7卷 6-18页

作者： Ferric CHRISTIAN edith SELLY Dendy ADITYAWARMAN Antonius INDARTO Department of Chemical Engineering Institut Teknologi BandungBandung 40132 Indonesia

Energy is of great because of its benefits as the importance in human life main resource for human activity. According to International Energy Agency （IEA）, energy demands are expected to continue increasing until 2030. Because energy demand will never decrease, it is necessary to develop modem technology, such as nano-based technology, in order to obtain a more effective and efficient process to produce more energy. The application of nano technology or nano material in the field of energy, which involves lithium-ion battery, fuel cell, light emitting diode （LED）, ultra-capacitor, and solar cell （including Graitzel cell）, is a hot topic in many scientific researches. Unfortunately, its current development is hampered by the expensive cost of production compared to conventional technologies. Therefore, priority should be given to nano technology in the energy sector order to obtain higher efficiency, lower production cost, and easier in its application.

关键词： nanotechnology energy batteries fuel cell Gratzel cell solar cell

Triboelectric nanogenerator based on electrodeposited Ag octahedral nano-assemblies

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Journal of Energy Chemistry 2023年第8期83卷 478-495,I0012页

作者： M.edith Navarro-Segura Margarita Sanchez-Dominguez Ana Arizmendi-Morquecho J.Alvarez-Quintana Group of Colloidal and Interfacial Chemistry Applied to Nanomaterials and Nanoformulations Centro de Investigacion en Materiales Avanzados S.C Unidad MonterreyAlianza Norte#202Autopista Monterrey-Aeropuerto Km.10.C.P.66628 ApodacaNuevo LeonMexico GENES-Group of Embedded Nanomaterials for Energy Scavenging Centro de Investigacion en Materiales Avanzados S.C.Unidad MonterreyAlianza Norte#202Autopista Monterrey-Aeropuerto Km.10.C.P.66628 ApodacaNuevo LeonMexico

The tremendous potential of triboelectric generators-TENGs for converting mechanical energy into electrical energy places them as one of the most promising energy harvesting technologies. In this work, the fabrication of enhanced performance TENGs using Ag octahedron nano-assemblies on ITO as electrodes significantly increases the electric charge collection of the induced tribocharges. Thereby, nanostructured electrical contacts coated with Ag macroscale nano-assemblies with octahedral features were obtained by the electrodeposition technique on flexible PET/ITO substrates. Consequently, the nanostructured triboelectric generator-TENG exhibited 65 times more maximum output power, and almost 10 times more open circuit output voltage than that of a TENG with non-nanostructured contacts passing from μW to m W capabilities, which was attributed to the increment of intrinsic interface states due to a higher effective contact area in the former. Likewise, output performances of TENGs also displayed an asymptotic behavior on the output voltage as the operating frequency of the mechanical oscillations increased, which is attributed to a decrement in the internal impedance of the device with frequency. Furthermore, it is shown that the resulting electrical output power can successfully drive low power consumption electronic devices. On that account, the present research establishes a promising platform which contributes in an original way to the development of the TENGs technology.

关键词： Triboelectric generator Nanostructured electrodeposited electrodes Ag octahedral nanoassemblies Electrode surface structure

Helicobacter pylori infection and drugs malabsorption

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World Journal of Gastroenterology 2014年第30期20卷 10331-10337页

作者： edith Lahner Camilla Virili Maria Giulia Santaguida Bruno Annibale Marco Centanni Gastrointestinal Unit Department of Digestive and Liver Disease"Sapienza" University of Roma00189 RomaItaly Endocrinology Unit Department of Medico-Surgical Sciences and Biotechnologies"Sapienza" University of Roma04100 LatinaItaly

Drug absorption represents an important factor affecting the efficacy of oral drug *** secretion and motility seem to be critical for drug absorption.A causal relationship between impaired absorption of orally administered drugs and Helicobacter pylori(***)infection has been *** have been reported between poor bioavailability of l-thyroxine and l-dopa and *** *** to the Maastricht Florence Consensus Report on the management of *** infection,*** treatment improves the bioavailability of both these drugs,whereas the direct clinical benefits to patients still await to be *** strong seems the association between *** infection and other drugs malabsorption,such as delavirdine and *** exact mechanisms forming the basis of the relationship between *** infection and impaired drugs absorption and/or bioavailability are not fully *** infection may trigger a chronic inflammation of the gastric mucosa,and impaired gastric acid secretion often *** reduction of acid secretion closely relates with the wideness and the severity of the damage and may affect drug *** minireview focuses on the evidence of *** infection associated with impaired drug absorption.

关键词： Drug malabsorption Helicobacter pylori gastritis Gastric hypoacidity Thyroxine treatment Thyroxine malabsorption Human immunodeficiency virus Delavirdine L-dopa Parkinson's disease Ketaconazole

Responses of soil microbial communities to freeze–thaw cycles in a Chinese temperate forest

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Ecological Processes 2021年第1期10卷 903-920页

作者： Changpeng Sang Zongwei Xia Lifei Sun Hao Sun Ping Jiang Chao Wang edith Bai CAS Key Laboratory of Forest Ecology and Management Institute of Applied EcologyChinese Academy of SciencesShenyang 110016China. University of Chinese Academy of Sciences Beijing 100049China. Shandong Provincial Key Laboratory of Water and Soil Conservation and Environmental Protection College of Resources and EnvironmentLinyi UniversityLinyi 276000China. Key Laboratory of Geographical Processes and Ecological Security in Changbai Mountains Ministry of EducationSchool of Geographical SciencesNortheast Normal UniversityChangchun 130024China. Key Laboratory of Vegetation Ecology Ministry of EducationChangchun 130024China.

Background:Freeze–thaw events are common in boreal and temperate forest ecosystems and are increasingly infuenced by climate *** microorganisms play an important role in maintaining ecosystem stability,but their responses to freeze–thaw cycles(FTCs)are poorly *** conducted a feld freeze–thaw experiment in a natural Korean pine and broadleaf mixed forest in the Changbai Mountain Nature Reserve,China,to determine the dynamic responses of soil microbial communities to ***:Bacteria were more sensitive than fungi to *** biomass,diversity and community composition were not signifcantly afected by freeze–thaw regardless of the *** initial freeze–thaw resulted in increased bacterial biomass,diversity,and copiotrophic taxa *** FTCs reduced the bacterial biomass and *** with the initial FTC,subsequent FTCs exerted an opposite efect on the direction of change in the composition and function of the bacterial *** water content,dissolved organic carbon,ammonium nitrogen,and total dissolved phosphorus were important factors determining bacterial community diversity and composition during ***,the functional potentials of the microbial community involved in C and N cycling were also afected by ***:Diferent stages of FTCs have diferent ecological efects on the soil environment and microbial *** FTCs changed the soil nutrients and water availability and then mainly infuenced bacterial community composition,diversity,and functional potentials,which may disturb C and N states in this temperate forest *** study also improves our understanding of microbial communities regulating their ecological functions in response to climate change.

关键词： Freeze–thaw cycle Microbial diversity Microbial community composition Soil resource availability Functional potential

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The house of mirth