1,723,056 research outputs found
Letter from Wang Yi-fu to Frank Fu (November, 15, 1982)
No full textThis is a two-page letter from Wang Yi-fu, faculty member at the Beijing Institute of Physical Education (now Beijing Sport University), to Dr. Frank Fu, Director of the International Center at Springfield College, dated November 15, 1982. The letter thanks Springfield College and Springfield College professor Charles J. Smith for giving four lectures on Swimming theory and practice. Charlie Smith was the first Springfield College professor to come to Beijing Sport University as part of the exchange agreement signed by the two institutes in 1981.Beijing Sport University was organized and established as the Central Institute of Physical Education (sport) in 1953 with the help of Professor Xu Yingchao, Springfield College graduate of the class 1938. The name of the university changed to Peking (Beijing) Institute of Physical Culture (physical education) in 1956 and renamed Beijing Sports University in 1993. The first agreement signed by Springfield College and the Beijing Sport University was on September 25, 1981, which provided pathways for collaboration and exchange of faculty and students
Review of Humanist geography: An individual’s search for meaning. Staunton, by Yi-Fu Tuan
No full textReview of Yi-Fu Tuan. (2012). Humanist Geography – An Individual’s Search for Meaning. George F. Thompson Publishing. 181 pages
[Ressenya] Tuan, Yi-Fu . Escapismo: formas de evasión en el mundo actual
No full textComentari al llibre de Yi-Fu Tuan, 'Escapismo : formas de evasión en el mundo actual', publicat l'any 2003 per Península. Obra on es reflexiona i es planteja les relacions entre Natura i Cultur
Scanning electrochemical microscopy (SECM): Study of the adsorption and desorption of hydrogen on platinum electrodes in Na2SO4 solution (pH=7)
No full textHydrogen adsorption and desorption at polycrystalline platinum electrodes in a neutral Na2SO4 solution were studied with a scanning electrochemical microscope. Experiments were carried out with the tip-substrate voltammetry mode, where the faradaic current flowing to the tip is recorded while cycling the potential of the substrate, and with the tip-substrate chronoamperometry mode, where the tip faradaic current is recorded as a function of time following the application of a potential step to the substrate. The tip current was made pH sensitive by holding the tip potential in a region where a pH- dependent reaction occurs. Proton reduction was used to monitor pH decrease, whereas platinum oxide formation was selected to detect pH increase. The results showed that a transient pH decrease as high as 2.3 pH units exists during hydrogen desorption and that a great pH increase occurs during hydrogen adsorption. The mechanisms of hydrogen adsorption and desorption were analysed by comparing tip current vs. substrate potential curves, which reflect the exchange of H+ between the adsorbed layer and the solution, with substrate current vs. substrate potential curves, which reflect the exchange of electrons between the adsorbed layer and the electrode. New conclusions have been drawn
Scanning electrochemical microscopy (SECM): study of the formation and reduction of oxides on platinum electrode surfaces in Na2SO4 solution (pH=7)
No full textThe formation and reduction of oxides on polycrystalline platinum were studied in a neutral solution with a scanning electrochemical microscope (SECM). Experiments were carried out with tip-substrate voltammetry where the faradaic current flowing to the tip is recorded while cycling the potential of the substrate, and with tip-substrate chronoamperometry where the faradaic tip current is recorded against time following the application of a potential step to the substrate. The tip current was made pH sensitive by holding the tip potential in a region where a pH dependent reaction occurs. Hydrogen evolution was used to probe pH decreases, oxygen evolution was used for the detection of pH increases and Pt oxide formation was used to detect both pH increases and decreases. The results showed that oxide formation occurs in two stages, each involving the transfer of electrons and the release of protons into the solution. During the first stage the release of H+ precedes the transfer of electrons, while in the second stage H+ release and electron transfer proceed simultaneously. Results are analysed in terms of the formation of PtOH during stage 1 and PtO during stage 2. However stage 2 behaves differently under slow potential changes and the release of protons lags behind the transfer of electrons. This is interpreted as the result of a place-exchange mechanism from PtOH to HOPt prior to stage 2, followed by the oxidation of HOPt to OPt during stage 2. Similarly, oxide reduction was found to occur in two stages, each involving the transfer of electrons and the consumption of protons. During the first stage, the consumption of H+ precedes the transfer of electrons. The results suggest that during the transfer of electrons, protons diffuse from the outer layer of the oxide (OPt) into the inner layer to form HOPt. For the second stage results are analysed in terms of a place exchange mechanism from HOPt to PtOH running in parallel with the consumption of H+, followed by a surface reduction from PtOH2+ to Pt metal
Analizando el concepto de lugar de Yi-fu Tuan en Serra do Lenheiro
No full textOs escritos de Yi-Fu Tuan, Geógrafo humanista, são de fundamental importância para compreendermos a relação do ser humano com os espaços geográficos, principalmente, no que se refere ao lugar. Dessa maneira, utilizamos como base para esse artigo o livro: Espaço e lugar: a perspectiva da experiência (2013), em que o autor apresenta como a questão fundamental, o conceito de lugar, sendo esse o conceito de análise desta pesquisa. Realizou-se um estudo de caso da relação existente entre a Equipe ALA e a Família Guimarães no Morro da Cruz, na Serra do Lenheiro, porção norte do município de São João Del-Rei, Minas Gerais.The writings of the humanist geographer Yi-Fu Tuan hold central importance in understanding the relationship between humans and geographical spaces, especially concerning place. This article is based on his book Space and Place: The Perspective of Experience (2013), in which he presents the concept of place as a fundamental issue. By analyzing this category, our research focused on a case study of the relationship between the ALA Team and the Guimarães Family in Morro da Cruz, in Serra do Lenheiro, northern São João Del-Rei municipality, Minas Gerais.Los escritos de Yi-Fu Tuan, Geógrafo humanista, son de fundamental importancia para comprender la relación del ser humano con los espacios geográficos, principalmente, no que se refieran al lugar. Dessa maneira, utilizamos como base para esse artigo o livro: Espaço e lugar: a perspectiva da experiência (2013), em que o autor presenta como a questão fundamental, o conceito de lugar, sendo esse o conceito de análise desta pesquisa. Realizou-se um estudo de caso da relação existente entre a Equipe ALA e a Família Guimarães no Morro da Cruz, na Serra do Lenheiro, porção norte do município de São João Del-Rei, Minas Gerais
Scanning electrochemical microscopy (SECM) study of pH changes at Pt electrode surfaces in Na2SO4 solution (pH 4) under potential cycling conditions
No full textpH Changes in the vicinity of a platinum electrode immersed in a 10(-4) mol dm(-3) H2SO4+0.5 mol dm(-3) Na2SO4 solution have been probed with a scanning electrochemical microscope (SECM). Experiments were carried out in the tip substrate voltammetric mode where the faradaic current flowing to the tip is recorded while cycling the potential of the substrate. The tip current was made pH-sensitive by holding the tip potential in a region where a pH-dependent reaction occurs. Three reactions were considered: hydrogen evolution, Pt oxide formation and oxygen evolution. The results provide direct evidence of a pH decrease close to the substrate during hydrogen desorption, oxide formation and oxygen evolution. Conversely, a pH increase is observed during oxide reduction, hydrogen adsorption and hydrogen evolution. A quantitative assessment of pH changes is proposed; variations as large as one pH unit were observed
Aesthetic Experience of Natural Environment by Yi-Fu Tuan and Ronald W. Hepburn
No full textThe topic of this dissertation is the aesthetic experience as it relates to our natural environment. This concept, while first established in the mid-20 century, is explored and expanded on, by both Yi-Fu Tuan and Ronald William Hepburn. This work will show how both philosophers are concerned in their special way in substantiating the specific attributes of the aesthetic experience with nature, and to further accent the important role nature has in our life by comparing both their approaches. The text at first contours the fundamentals of environmental aesthetics at the time it was first established. Within this frame of environmental aesthetics, both Tuan and Hepburn introduced a wide range of ideas. The main task of this dissertation is to explore the ideas both philosophers have in common and show where their viewpoints differ. Yi-Fu Tuan accents the pure and frameless experience with nature, whereas Hepburn leads us to acknowledge the inherence of senses and thought components in our aesthetic appreciation of nature. According to Hepburn we did not create nature, but we have extensive knowledge about it; and therefore, we should project this into our appreciation of our natural environment. Unless we realize this, we are unable to properly appreciate and judge our natural environment and how it..
Lugar: Uma perspectiva experiencial
No full textRegardless of size and physical characteristics the attribution of the
word “place” to the many perceptions of the living spaces by man.
From the hearth to the nation, the range of phenomena that can be
considered places is vast. In his text, published in 1975, Yi-Fu Tuan
broadens and raises discussions about the multiplicity of places, which
are legitimized by experience, being among them the home and its
interiors, the city and its urbanity, the neighborhood, the region, and
the nation-state. Experiencing such places actively and passively is
paramount, since the place is constructed from physical, mental,
sensory, and psychological experience in the lived space: it is the
center of meaning.Independe de tamanho e de características físicas a atribuição da
alcunha “lugar” às diversas percepções do homem sobre os espaços
vividos. Da lareira à nação, é vasta a gama de fenômenos que
podem ser tidos como lugares. Em seu texto, publicado em 1975,
Yi-Fu Tuan amplia e eleva as discussões acerca da multiplicidade de
lugares, os quais são legitimados pela experiência, dentre eles o lar
e seus interiores, a cidade e sua urbanidade, a vizinhança, a região
e a nação-estado. Experienciar tais lugares ativa e passivamente é
primordial, uma vez que o lugar é construído a partir da experiência
física, mental, sensorial, psicológica no espaço vivido: é centro de
significado
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