1,284 research outputs found
The present state of China: being a series of articles by H.G.W. Woodhead.
87 pages, Reprinted from the Peking & Tientsin Times, April, 1923.https://digitalrepository.trincoll.edu/moore/1096/thumbnail.jp
A survey of weather information possessed by thirty-two pupils randomly selected from sixth and eleventh grades and from special classes
Thesis (Ed.M.)--Boston Universit
Evolution of precipitates, in particular cruciform and cuboid particles, during simulated direct charging of thin slab cast vanadium microalloyed steels
A study has been undertaken of four vanadium based steels which have been processed by a simulated direct charging route using processing parameters typical of thin slab casting, where the cast product has a thickness of 50 to 80mm ( in this study 50 mm) and is fed directly to a furnace to equalise the microstructure prior to rolling. In the direct charging process, cooling rates are faster, equalisation times shorter and the amount of deformation introduced during rolling less than in conventional practice. Samples in this study were quenched after casting, after equalisation, after 4th rolling pass and after coiling, to follow the evolution of microstructure. The mechanical and toughness properties and the microstructural features might be expected to differ from equivalent steels, which have undergone conventional processing. The four low carbon steels (~0.06wt%) which were studied contained 0.1wt%V (V-N), 0.1wt%V and 0.010wt%Ti (V-Ti), 0.1wt%V and 0.03wt%Nb (V-Nb), and 0.1wt%V, 0.03wt%Nb and 0.007wt%Ti (V-Nb-Ti). Steels V-N and V-Ti contained around 0.02wt% N, while the other two contained about 0.01wt%N. The as-cast steels were heated at three equalising temperatures of 1050C, 1100C or 1200C and held for 30-60 minutes prior to rolling. Optical microscopy and analytical electron microscopy, including parallel electron energy loss spectroscopy (PEELS), were used to characterise the precipitates. In the as-cast condition, dendrites and plates were found. Cuboid particles were seen at this stage in Steel V-Ti, but they appeared only in the other steels after equalization. In addition, in the final product of all the steels, fine particles were seen, but it was only in the two titanium steels that cruciform precipitates were present. PEELS analysis showed that the dendrites, plates, cuboids, cruciforms and fine precipitates were essentially nitrides. The two Ti steels had better toughness than the other steels but inferior lower yield stress values. This was thought to be, in part, due to the formation of cruciform precipitates in austenite, thereby removing nitrogen and the microalloying elements which would have been expected to precipitate in ferrite as dispersion hardening particles
Community-acquired pneumonia on the intensive care unit: secondary analysis of 17,869 cases in the ICNARC Case Mix Programme Database
Large-Scale Educational Question Analysis with Partial Variational Auto-encoders
Online education platforms enable teachers to share a large number of
educational resources such as questions to form exercises and quizzes for
students. With large volumes of such crowd-sourced questions, quantifying the
properties of these questions in crowd-sourced online education platforms is of
great importance to enable both teachers and students to find high-quality and
suitable resources. In this work, we propose a framework for large-scale
question analysis. We utilize the state-of-the-art Bayesian deep learning
method, in particular partial variational auto-encoders, to analyze real-world
educational data. We also develop novel objectives to quantify question quality
and difficulty. We apply our proposed framework to a real-world cohort with
millions of question-answer pairs from an online education platform. Our
framework not only demonstrates promising results in terms of statistical
metrics but also obtains highly consistent results with domain expert
evaluation.Comment: 19 pages, 13 figure
Globally rare oceanic-montane liverworts with disjunct distributions:evidence for long-distance dispersal
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