83 research outputs found
English Nounsβ Valency in Terms of Phraseology
This article deals with the analysis of the noun used in the English phraseology as it has the highest phraseological activity. The subject of special attention is a study of phraseological units with a phytonym component. The group of phraseological units with a phytonym component is the most frequently used one. Some phytonyms demonstrate unusual cultural connotations typical to this languag
Lexical-Semantic Analysis of English Phraseological Units with Phytonym Component
This article devoted to the lexical-semantic analysis of English phraseological units with phytonym component. The subject of this paper is a lexical and semantic analysis and characteristics of such phraseological units. Special attention is given to lexical and semantic features of phytonyms functioning. The use of the term βphytonymβ is define
Deep awareness as a factor of environmental motivation at sea
There are environmental problems at sea and some of them are specific. The International Maritime Organization is on the way of strict controlling permanently intensification regulations. One of the most important of them is the International Convention for the Prevention of Pollution from Ships (MARPOL). To prevent uncontrolled and undesired actions of seafarers officers are interested in strong methods including motivating others and themselves as leadership skills are requested by practice and the International Convention on Standards of Training, Certification and Watchkeeping for Seafarers (STCW). After considering different types of motives, factors in/decreasing their effectiveness existing at sea, the authors developed the practical research, analyzed the revealed data on the nature of the dominating motives among cadets of the Maritime University and the seafarers, and concluded highly developed awareness of the existing pollution at sea. Established forming experiment proved that the deep awareness of environmental problems adds to the inside, the strongest environmental motivation to fallow International regulations, acceptable from both behavioral and self-controlling points of view. Further actualized professional self-organization strategy helped to educational ecological project development, which were involved in the working courses
Control of microswimmers by spiral nematic vortices: transition from individual to collective motion and contraction, expansion, and stable circulation of bacterial swirls
Active systems comprised of self-propelled units show fascinating transitions
from Brownian-like dynamics to collective coherent motion. Swirling of swimming
bacteria is a spectacular example. This study demonstrates that a nematic
liquid crystal environment patterned as a spiral vortex controls
individual-to-collective transition in bacterial swirls and defines whether
they expand or shrink. In dilute dispersions, the bacteria swim along open
spiral trajectories, following the pre-imposed molecular orientation. The
trajectories are nonpolar. As their concentration exceeds some threshold, the
bacteria condense into unipolar circular swirls resembling stable limit cycles.
This collective circular motion is controlled by the spiral angle that defines
the splay-to-bend ratio of the background director. Vortices with dominating
splay shrink the swirls towards the center, while vortices with dominating bend
expand them to the periphery. 45o spiraling vortices with splay-bend parity
produce the most stable swirls. All the dynamic scenarios are explained by
hydrodynamic interactions of bacteria mediated by the patterned passive nematic
environment and by the coupling between the concentration and orientation. The
acquired knowledge of how to control individual and collective motion of
microswimmers by a nematic environment can help in the development of
microscopic mechanical systems.Comment: Main text (39 pages and 9 figures) and supplementary materials (10
pages and 6 figures
Surface superconducting states in yttrium hexaboride single crystal in a tilted magnetic field
We present the results of an experimental study of the nucleation of
superconductivity at the surface of a single crystal YB in a tilted dc
magnetic field. A recently developed experimental technique allowed us to
determine at each side of the sample as a function of the angle
between the dc magnetic field and the surface. Experiment shows that the ratio
in the direction perpendicular to the surface dc
field while according to the theory this ratio should be equal to 1. This sharp
distinction cannot be ascribed to the surface roughness.Comment: 6 pages, 8 figure
Quantile regression with group lasso for classification
Applications of regression models for binary response are very common and models specific to these problems are widely used. Quantile regression for binary response data has recently attracted attention and regularized quantile regression methods have been proposed for high dimensional problems. When the predictors have a natural group structure, such as in the case of categorical predictors converted into dummy variables, then a group lasso penalty is used in regularized methods. In this paper, we present a Bayesian Gibbs sampling procedure to estimate the parameters of a quantile regression model under a group lasso penalty for classification problems with a binary response. Simulated and real data show a good performance of the proposed method in comparison to mean-based approaches and to quantile-based approaches which do not exploit the group structure of the predictors
Nonmonotone Barzilai-Borwein Gradient Algorithm for -Regularized Nonsmooth Minimization in Compressive Sensing
This paper is devoted to minimizing the sum of a smooth function and a
nonsmooth -regularized term. This problem as a special cases includes
the -regularized convex minimization problem in signal processing,
compressive sensing, machine learning, data mining, etc. However, the
non-differentiability of the -norm causes more challenging especially
in large problems encountered in many practical applications. This paper
proposes, analyzes, and tests a Barzilai-Borwein gradient algorithm. At each
iteration, the generated search direction enjoys descent property and can be
easily derived by minimizing a local approximal quadratic model and
simultaneously taking the favorable structure of the -norm. Moreover, a
nonmonotone line search technique is incorporated to find a suitable stepsize
along this direction. The algorithm is easily performed, where the values of
the objective function and the gradient of the smooth term are required at
per-iteration. Under some conditions, the proposed algorithm is shown to be
globally convergent. The limited experiments by using some nonconvex
unconstrained problems from CUTEr library with additive -regularization
illustrate that the proposed algorithm performs quite well. Extensive
experiments for -regularized least squares problems in compressive
sensing verify that our algorithm compares favorably with several
state-of-the-art algorithms which are specifically designed in recent years.Comment: 20 page
Deep awareness as a factor of environmental motivation at sea
There are environmental problems at sea and some of them are specific. The International Maritime Organization is on the way of strict controlling permanently intensification regulations. One of the most important of them is the International Convention for the Prevention of Pollution from Ships (MARPOL). To prevent uncontrolled and undesired actions of seafarers officers are interested in strong methods including motivating others and themselves as leadership skills are requested by practice and the International Convention on Standards of Training, Certification and Watchkeeping for Seafarers (STCW). After considering different types of motives, factors in/decreasing their effectiveness existing at sea, the authors developed the practical research, analyzed the revealed data on the nature of the dominating motives among cadets of the Maritime University and the seafarers, and concluded highly developed awareness of the existing pollution at sea. Established forming experiment proved that the deep awareness of environmental problems adds to the inside, the strongest environmental motivation to fallow International regulations, acceptable from both behavioral and self-controlling points of view. Further actualized professional self-organization strategy helped to educational ecological project development, which were involved in the working courses
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