1,721,771 research outputs found
Oral History of Nguyen Chi Thien
No full textOral history of poet Nguyen Chi Thien, born in Hanoi, Vietnam in 1939. He passed away on October 2, 2012 in Orange County, California at the age of 73. Nguyen Chi Thien grew up in a lower-middle class family and recalled experiences under French colonial rule before 1954 and under the Communist regime in North Vietnam after 1954. He spoke in detail of his imprisonment in 1961 for teaching history in Hai Phong that was deemed “propaganda” against the Communist government. He wrote hundreds of poems in his head throughout his terms of imprisonment. His poetry was published overseas and continues to be banned in Vietnam. He left Vietnam via the Orderly Departure Program in 1995 and resettled in Santa Ana, California.Recorded Digitall
Situation de l'agriculture nord-vietnamienne
No full textNguyen chi Thanh. Situation de l'agriculture nord-vietnamienne. In: Tiers-Monde, tome 4, n°13-14, 1963. pp. 227-236
Stellar Evolution with Rotation in PARSEC v2.0: Tracks and Isochrones for Low- and Intermediate-mass Stars
Get PDFRotation is always known as an important ingredient in stellar models. Studying the impacts of rotation on stellar structure and evolution is the goal of my thesis. PARSEC models is being widely used in the astronomical com munity over the last decade. Nevertheless, for the first time, the PARSEC
rotating stellar tracks and isochrones are provided to the community, with a
suitable range of masses and metallicities. Specifically, we consider the mod els from very low mass up to 14M⊙, and the metallicity ranges from 0.004 to
0.017. The PARSEC V2.0 code is used to perform the calculations, and the
dedicated sites are created for delivering them to users.
The concurrence between rotation and the convective core overshooting
phenomenon has been carefully calibrated in previous works. In this project,
I inherit this result and adopt the maximum value of core overshooting ef ficiency parameter λov,max = 0.4. A linear growth from zero of stars that
do not develop a convective core to this maximum value where stars already
have a fully convective core is adopted for stars with masses in the transition
region. The shellular rotation is treated as a purely diffusive process under
the assumption of Roche model. Seven initial rotation rates are considered
from zero to the extremely close critical velocity (namely, ωi = 0 − 0.99).
The mass loss process is now applied during the evolution of stars due to
the enhancement caused by rotation, with the suitable adopted rates that
depend on the mass range. In this project, the low-mass (0.8 ≳ M ≳ 2M⊙)
and intermediate-mass (2 ≳ M ≳ 14M⊙) are the main targets of the analysis
in this thesis. The effects of geometrical distortion and rotational mixing
are clearly seen in the Hertzsprung-Russell diagram of our tracks. We have
seen the rotating stars spend their time longer in the Main-Sequence phase
with respect to their non-rotating counterparts. Also, the higher core mass
they would have at the post-main-sequence phases. Especially in the case
of intermediate-mass stars, where the CNO-cycles are the main channel of nuclear burning during the main-sequence, the enhancement (depletion) of
surface nitrogen and helium (carbon and oxygen) are the most evidence of
rotational mixing. Indeed, the faster stars rotate the more enhancement/de pletion. As a consequence, with our new models, we can reproduce very well
the hook feature of the open cluster M67, as well as the “global” fitting.
Furthermore, we also see a hint of at least two populations that harbour in
the open cluster NGC 6633 to explain the extended main-sequence and the
position of the three He-clump stars. Finally, this new collection of stellar
tracks and corresponding isochrones are available online at the dedicated
websites, and most suitably used for studies of young and intermediate-age
open clusters
Scientific knowledge production in China: a comparative analysis
No full textOver the past few decades, the rising economic power of China has led to the expansion of its indigenous science and technology capacity. However, the key characteristics and patterns of the Chinese catch-up process have been mainly explained based on patenting activities that only reflect the progress of technological capabilities accumulation. Therefore, this paper seeks to expand the conventional understanding of China's technological upgrading based on the flying geese model by analyzing scientific knowledge production using hierarchical cluster analysis and examination of the similarities and differences between Chinese and latecomers' scientific patterns. The results show that China has reached the same level of scientific publication capacity as Japan and Korea since 2006, and has recently overtaken Japan to become the biggest scientific powerhouse in the Asia Pacific region. Additionally, during the catch-up period, China's scientific portfolio demonstrates a combination of features that resemble both Korean and Taiwanese attributes. These findings partially contradict the traditional flying geese model and point out additional interpretations of the convergence and divergence of developmental paths among advanced countries and less developed nations. The study contributes to the theory of technological dominance in East Asia and to the understanding of China's dominant role in knowledge production worldwide. Several implications and directions for future research regarding scientific advancement in emerging economies are discussed.
Going Beyond Counting First Authors in Author Co-citation Analysis
Get PDFThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Variations on the Author
Get PDF“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
Appropriate Similarity Measures for Author Cocitation Analysis
Get PDFWe provide a number of new insights into the methodological discussion about author cocitation analysis. We first argue that the use of the Pearson correlation for measuring the similarity between authors’ cocitation profiles is not very satisfactory. We then discuss what kind of similarity measures may be used as an alternative to the Pearson correlation. We consider three similarity measures in particular. One is the well-known cosine. The other two similarity measures have not been used before in the bibliometric literature. Finally, we show by means of an example that our findings have a high practical relevance.information science;Pearson correlation;cosine;similarity measure;author cocitation analysis
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