1,722,038 research outputs found
Chen Bi-sheng & Yang Guo-zhen, Chen Jia-geng zhuan
No full textChing-Fatt Yong. Chen Bi-sheng & Yang Guo-zhen, Chen Jia-geng zhuan. In: Archipel, volume 27, 1984. pp. 201-202
Chen Bi-sheng & Yang Guo-zhen, Chen Jia-geng zhuan
No full textChing-Fatt Yong. Chen Bi-sheng & Yang Guo-zhen, Chen Jia-geng zhuan. In: Archipel, volume 27, 1984. pp. 201-202
Peak uplift resistance of offshore slender structures shallowly buried in the sloping seabed considering wave actions
No full textThe current practice for the pipe-soil interaction mainly focuses on the pipelines which are buried in the level ground, and ocean waves are rarely considered. However, sloping topographies and wave actions are often encountered by offshore slender structures. This study numerically investigated their peak uplift resistances, taking multiple factors, i.e., the slope effect and wave effect, into account simultaneously. The numerical model was first verified by the available analytical and experimental results. It was found that the normalized peak uplift resistance decreases as the slope angle increases, especially for smaller burial ratios. The presence of wave troughs weakens the traditional peak uplift resistance. For the given burial ratio and slope angle, the reduction in the peak uplift resistance increases almost linearly with the local wave steepness. For steeper slopes and smaller burial ratios, this reduction becomes larger because of more intense upward seepage. The effects of local relative water depth and wave period were also studied. Finally, a preliminary formula for the reduction in the peak uplift resistance of shallowly-buried offshore slender structures was proposed to consider the slope effect and wave effect
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe 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
Three-dimensional crustal model of Shanxi graben from 3D joint inversion of ambient noise surface wave and Bouguer gravity anomalies
No full textThe main objective of this study is to obtain a model that can explain the surface wave data and Bouguer gravity anomaly simultaneously and also to alleviate the non-uniqueness of surface wave inversion. We applied a novel non-linear joint inversion technique using both surface wave and gravity anomalies to obtain high resolution 3D shear-wave velocity crustal model of Central North China Craton including Shanxi graben. The crustal model helps us to understand the crust and mantle dynamics and the evolution history of the Shanxi rift. We bandpass filtered WGM2012 global Bouguer gravity anomaly data to remove the data with wavelength less than 50 km and greater than 200 km. We then projected the gravity data and surface wave data from ambient noise tomography to a Cartesian coordinate system with grid spacing 50 km??50 km. The joint inversion was performed in this coordinate system. The inversion volume is much larger than the target region. This parameterization strategy was chosen to minimize the likelihood edge effects from gravity modelling. We used Crust 2.0 global model as our initial model in the inversion. An approximate non-linear P velocity and density relationship is derived from combing Birch's law and Nafe-Drake's curve. For each iteration of inversion, the sensitivity kernel of surface wave and gravity data were recalculated and updated until the inversion converged. We did several experiments to obtain an optimized weighting parameter to balance the influences of both datasets. A surface-wave-only inversion was also performed to compare the results of joint inversion. Both shear wave velocity models from joint inversion and surface-wave-only inversion can fit surface wave data well though only the joint inversion provides an acceptable fit to the gravity data. Gravity misfits decrease from >30 mGal to ~3.4 mGal after joint inversion. The velocity anomalies from both inversions all show a remarkable correlation with surface geology and upper crustal structures beneath Shanxi rift. The L??liang mountain region and Datong volcanic region all show relatively high shear wave velocity in the upper crust. Meanwhile, the basins in the southern rift show slow velocities. The southern part of the Shanxi rift is slower than the northern part in the upper crust. The Cenozoic extension started from the northern rift and then passed on to the southern rift. However, in the mid-and-lower crust beneath the Datong volcanic region, the surface-wave-only inversion resolves much slower shear wave velocity compared to the joint inversion model. The most pronounced difference occurs in the mid-and-lower crust beneath the L??liang mountain region. The joint inversion reveals a slow velocity anomaly with amplitude about 2%, while the surface-wave-only inversion model shows a fast velocity. The Datong volcanic region, north part of the Shanxi rift, might have experienced mantle upwelling since the Cenozoic time. The hot and buoyant mantle heated the upper most mantle and the crust, which caused the large-scale mid and lower crust slow velocity and negative gravity anomaly in the Datong volcanic region. The slow velocity anomaly beneath the L??liang mountain region is also related to the mantle upwelling beneath the Datong volcanic region. The Cenozoic mantle upwelling might control the formation and evolution of the Shanxi rift. ?, 2015, Science Press. All right reserved.EI03821-8315
Variations on the Author
Full text link“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
Full text linkWe 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
Scaling of rough-wall turbulence in a transitionally rough regime
No full textIn this Letter, we propose a roughness scaling method based on the direct numerical simulation of turbulent channel flow over three-dimensional sinusoidal rough walls in a transitionally rough regime. A new coupling scale Re-tau/((k) over bar (+) S)(n) is defined by combining the Reynolds number Re-tau and the roughness parameter (k) over bar (+) S, where (k) over bar (+) is the mean roughness height, S is the roughness steepness, and n is the scaling exponent-which depends on the roughness type. The relationships between Re-tau, (k) over bar (+) S, the roughness function, the friction factor, and the peak of the streamwise turbulent velocity fluctuation are explored. This approach provides an effective way for collapsing rough-wall turbulence data with different Re-tau and (k) over bar (+) S.
Experimental Data on Fire-Resistance Behavior of Reinforced Concrete Structures with Example Calculations
Full text linkThis thesis selects concrete, steel and their relation as research subjects, mainly commentary and discusses the property changes of steel and concrete materials under and after high temperature.The differences and comparisons of reasearch methods and ways between different researchers and different papers,particularly for chinese researches and chinese papers,and partly for comparison between chinese papers methods and Euro-Amercian papers methods about Fire Resistance Behavior of Reinforced Concrete will be summarized and analyzed.The researches on fire-resistance behavior of reinforced concrete become more and more important all over the world. And I would find differences between Chinese researches results, between Chinese researches results and other countries researches results
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