1,722,074 research outputs found
Li Ju setting up equipment, Chinese Arch
No full textLi Ju, photographer from Beijing, sets up camera at Chinese Arch
Siu Lin Santee and Li Ju in front of Chinese Railway Workers Descendants Association exhibit, Marriott Library
No full textSui Lin Santee (left) installed the Chinese Railway Workers Descendants Association exhibit on view at the 5th floor of the Marriott Library April 4 through September 27, 2019. Li Ju (right) is a freelance photographer from Beijing China, is featured in the exhibit. Li Ju retraced the Central Pacific and Union Pacific Railroad routes to recreate the photographs of Andrew J. Russell and Alfred A. Hart. These photographs Li Ju took in the exact same locations as Russell and Hart are included in the exhibit
Time mesh independent framework for learning materials constitutive relationships
No full textReal-world datasets are rarely populated by evenly distributed entries; unevenness may be caused by sensor malfunctions or randomized sampling due to the process nature. Modeling the constitutive relationship (CR) of materials in scenarios where the temporal data available are uneven is a serious challenge for black box approaches such as artificial neural networks. This work presents a general framework capable of modeling uneven sampled data, which is composed of an Encoder–Decoder (ED) structure. In our framework, the Encoder can process an uneven input sequence, thanks to an approximation of the Ordinary Differential Equations (ODE), and project it into a lower dimensional latent space; the Decoder, on the other hand, can map the compressed information into the output of interest, the material stress response in this work. In the proposed temporal mesh independent framework, the Encoder is a multi-layer structure, with each layer consisting of a Long-Short Term Memory (LSTM) layer, a Closed form Continuous Time (CfC) layer, and a Self Multi-Head Attention Layer (MHAL) layer connected in series. The Decoder can be one Fully Connected Network (FCN) or two FCNs in parallel; in the latter case, the Decoder is capable of giving the mean and the variance of the output. The presented mesh-independent framework demonstrates good accuracy despite both the unevenness and the noise of the training data, specially when its results are compared to the standard ones; thus extending the applicability of neural-network-based black box models in real world applications
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
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
Crystal metamorphosis at stress extremes: how soft phonons turn into lattice defects
Full text linkr The Author(s) 2016 At 0 K, phonon instability controls the ideal strength and the ultrafast dynamics of defect nucleation in perfect crystals under high stress. However, how a soft phonon evolves into a lattice defect is still unclear. Here, we develop a full-Brillouin zone soft-phonon-searching algorithm that shows outstanding accuracy and efficiency for pinpointing general phonon instability within the joint material-reciprocal (x–k) spaces. By combining finite-element modeling with embedded phonon algorithm and atomistic simulation, we show how a zone-boundary soft phonon is first triggered in a simple metal (aluminum) under nanoindentation, subsequently leading to a transient new crystal phase and ensuing nucleation of a deformation twin with only one-half of the transformation strain of the conventional twin. We propose a two-stage mechanism governing the transformation of unstable shortwave phonons into lattice defects, which is fundamentally different from that initially triggered by soft long-wavelength phonons. The uncovered material dynamics at stress extremes reveal deep connections between delocalized phonons and localized defects trapped by the full nonlinear potential energy landscape and add to the rich repertoire of nonlinear dynamics found in nature.National Natural Science Foundation of China (Grant No. 50971090)National Natural Science Foundation of China (Grant No. 51071101)National Natural Science Foundation of China (Grant No. 51471107)National Science Foundation (U.S.). Division of Materials Research (DMR-410636
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