8,684 research outputs found
Automated Detection of Usage Errors in non-native English Writing
In an investigation of the use of a novelty detection algorithm for identifying inappropriate word
combinations in a raw English corpus, we employ an
unsupervised detection algorithm based on the one-
class support vector machines (OC-SVMs) and extract
sentences containing word sequences whose frequency
of appearance is significantly low in native English
writing. Combined with n-gram language models and
document categorization techniques, the OC-SVM classifier assigns given sentences into two different
groups; the sentences containing errors and those
without errors. Accuracies are 79.30 % with bigram
model, 86.63 % with trigram model, and 34.34 % with four-gram model
Precise determination of excitation energies in condensed-phase molecular systems based on exciton-polariton measurements
The precise determination of the excitation energies in condensed-phase
molecular systems is important for understanding system-environment
interactions as well as for the prerequisite input data of theoretical models
used to study the dynamics of the system. The excitation energies are usually
determined by fitting of the measured optical spectra that contain broad and
unresolved peaks as a result of the thermally random dynamics of the
environment. Herein, we propose a method for precise energy determination by
strongly coupling the molecular system to an optical cavity and measuring the
energy of the resulting polariton. The effect of thermal fluctuations induced
by the environment on the polariton is also investigated, from which a power
scaling law relating the polariton's linewidth to the number of molecules is
obtained. The power exponent gives important information about the
environmental dynamics.Comment: 9 pages, 11 figure
Japanese activities in refrigeration technology
Recent activities in refrigeration technology in Japan are discussed. Stirling cycle refrigerators and magnetic refrigerators are discussed. The development of units for use on trains is discussed
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