摘要 :
Meticillin-resistant Staphylococcus aureus (MRSA) is one of the main causes of hospital-acquired infections, but since late 1990s also the community-acquired. For better understanding of the S. aureus epidemiology there is an urge...
展开
Meticillin-resistant Staphylococcus aureus (MRSA) is one of the main causes of hospital-acquired infections, but since late 1990s also the community-acquired. For better understanding of the S. aureus epidemiology there is an urgent need for creation of new typing method for SCCmec element. The molecular typing of MRSA for epidemiological purposes is investigated by pulsed-field gel electrophoresis (PFGE), multilocus sequence typing (MLST), spa typing and the SCCmec type assignment. In last few years not only new type of SCCmec (VI to XI) have been identified, but also additional subtypes (i.e. IVg-j) and different variants of already existed one (i.e. 5C2&5 and 2B2&5) were discovered. The aim of this review is to briefly summarize current knowledge about SCCmec classification and to discuss advantages and disadvantages of selected SCCmec typing methods.
收起
摘要 :
Let (R,m) be a one-dimensional, local, Noethe-rian domain, and let R be the integral closure of R in its quotient field K. We assume that R is not regular, analyti-cally irreducible and residually rational. The usual valuation υ:...
展开
Let (R,m) be a one-dimensional, local, Noethe-rian domain, and let R be the integral closure of R in its quotient field K. We assume that R is not regular, analyti-cally irreducible and residually rational. The usual valuation υ:K → Z ∪ ∞ associated to R defines the numerical semi-group υ(R) = {υ(a), a ∈ R, a ≠ 0} ∈ N. The aim of the paper is to study the non-negative invariant b:= (c — δ)r — δ, where c,δ,r denote the conductor, the length of R/R and the Cohen-Macaulay type of R, respectively. In particular, the classification of the semigroups υ(R) for rings having b ≤ 2(r-1) is realized. This method of classification might be successfully utilized with similar arguments but more boring computations, in the cases b ≤ q(r-1), for reasonably low values of q. The main tools are type sequences and the invariant k which estimates the number of elements in υ(R) belonging to the interval [c - e, c), e being the multiplicity of R.
收起
摘要 :
This article describes a systematic approach to subgroup classification based on a classification framework and sequential steps involved in the subgrouping process. The sequential steps are stating the purpose of the classificati...
展开
This article describes a systematic approach to subgroup classification based on a classification framework and sequential steps involved in the subgrouping process. The sequential steps are stating the purpose of the classification, identifying the classification elements, using relevant information, and using clearly stated and purposeful subgroup classification terms. This systematic approach reflects current changes in the field of intellectual disability (ID), the modern and social understanding of ID, and the multiple purposes for classification.
收起
摘要 :
Problems connected with the long version of atom-based Periodic System of chemical elements with arbitrary 1-18 group numbering recommended by IUPAC are discussed.Introducing the atomic cores of elements instead of atoms to the Pe...
展开
Problems connected with the long version of atom-based Periodic System of chemical elements with arbitrary 1-18 group numbering recommended by IUPAC are discussed.Introducing the atomic cores of elements instead of atoms to the Periodic Table enables to define unequivocally the Periodic System as a triparametric classification resulting from three numbers:the number of core electron shells n,the core charge q,and the number of valence subshells l.The core based periodic chart is free of any imperfections and limitations of the atom based system and it enables reasonable numeration of groups and periods according to the nql parameters.
收起
摘要 :
A classification method is presented to classify stress modes in assumed stress fields of hybrid finite element based on the eigenvalue examination and the concept of natural deformation modes. It is assumed that there only exist ...
展开
A classification method is presented to classify stress modes in assumed stress fields of hybrid finite element based on the eigenvalue examination and the concept of natural deformation modes. It is assumed that there only exist m (=n-r) natural deformation modes in a hybrid finite element which has n degrees of freedom and r rigid-body modes. For a hybrid element, stress modes in various assumed stress fields proposed by different researchers can be classified into m stress mode groups corresponding to m natural deformation modes and a zero-energy stress mode group corresponding to rigid-body modes by the m natural deformation modes. It is proved that if the flexibility matrix [H] is a diagonal matrix, the classification of stress modes is unique. Each stress mode group, except the zero-energy stress mode group, contains many stress modes that are interchangeable in an assumed stress field and do not cause any kinematic deformation modes in the element. A necessary and sufficient condition for avoiding kinematic deformation modes in a hybrid element is also presented. By means of the m classified stress mode groups and the necessary and sufficient condition, assumed stress fields with the minimum number of stress modes can be constructed and the resulting elements are free from kinematic deformation modes. Moreover, an assumed stress field can be constructed according to the problem to be solved. As examples, 2-D, 4-node plane element and 3-D, 8-node solid element are discussed.
收起
摘要 :
In this paper, the determination of composition of certified samples of austenitic steel alloys was done by combining laser-induced breakdown spectroscopy (LIBS) technique with machine learning algorithms. Isolation forest algorit...
展开
In this paper, the determination of composition of certified samples of austenitic steel alloys was done by combining laser-induced breakdown spectroscopy (LIBS) technique with machine learning algorithms. Isolation forest algorithm was applied to the MinMax scaled LIBS spectra in the spectral range form (200-500) nm to detect and eject possible outliers. Training dataset was then fitted with random forest regressor (RFR) and Gini importance criterion was used to identify the features that contribute the most to the final prediction. Optimal model parameters were found by using grid search cross-validation algorithm. This was followed by final RFR training. Results of RFR model were compared to the results obtained from linear regression with L-2 norm and deep neural network (DNN) by means of R(2 )metrics and root-mean-square error. DNN showed the best predictive power, whereas random forest had good prediction results in the case of Cr, Mn and Ni, but in the case of Mo, it showed limited performance.
收起
摘要 :
Classification of chemical elements in the reaction cell of an inductively coupled plasma mass spectrometer (ICP-MS) was first reported based on the affinities with multiple elements, i.e. sulfur, oxygen, and fluorine. The data we...
展开
Classification of chemical elements in the reaction cell of an inductively coupled plasma mass spectrometer (ICP-MS) was first reported based on the affinities with multiple elements, i.e. sulfur, oxygen, and fluorine. The data were summarized in the periodic table based on the affinity with each of the three elements mentioned above. An example of the application of the present results was illustrated by analyzing Y and La in the matrix of Sr and Ba, offering apparently improved background equivalent concentration (BEC) and detection limits (DL).
收起
摘要 :
A TWINSPAN classification divides the moss flora of southern Africa (South Africa, Namibia, Botswana, Swaziland, and Lesotho) into two main bryofloristic elements: (1) the Xerophytic (south-western) element mainly distributed in t...
展开
A TWINSPAN classification divides the moss flora of southern Africa (South Africa, Namibia, Botswana, Swaziland, and Lesotho) into two main bryofloristic elements: (1) the Xerophytic (south-western) element mainly distributed in the winter rainfall and semi-arid to arid, temperate areas of southern Africa, and (2) the Mesophytic (subtropical) element distributed in more stable, subtropical habitats of the northern, eastern and southern parts of southern Africa. The Xerophytic element is dominated by acrocarpous mosses, including the ephemerals, while the Mesophytic element contains most of the pleurocarpous mosses. The main Xerophytic element is subdivided into the Eastern Highlands and Cape Elements while the Mesophytic element consists of the Afromontane Grassland and Afromontane Forest Elements. The Afromontane Forest Element is the largest bryofloristic element and contains the most southern African moss endemics. The four bryofloristic elements are subdivided into eight subelements: the Eastern Highlands Element into the Mont Aux Sources and Widespread Subelements, the Cape Element into the West Coast and Boland Subelements, the Afromontane Grassland Element into the Disjunct Cape Peninsula and Drakensberg Subelements, and the Afromontane Forest Element into the Widespread Afromontane and Tropical Afromontane Subelements. Many of the bryofloristic elements and distribution centres correspond with phytogeographical elements and centres described for the seed plants of southern Africa. The Afromontane area in the south-western Cape is identified as a bryogeographical hotspot.
收起
摘要 :
A class of C*-algebras is described for which the C*-homomorphisms from C-0(0, 1] to the algebra may be classified by means of the Cuntz semigroup functor. Examples are given of algebras-simple and non-simple-for which this classi...
展开
A class of C*-algebras is described for which the C*-homomorphisms from C-0(0, 1] to the algebra may be classified by means of the Cuntz semigroup functor. Examples are given of algebras-simple and non-simple-for which this classification fails. It is shown that a suitable suspension of the Cuntz semigroup functor deals successfully with some of these counterexamples.
收起
摘要 :
Let h(Γ) denote the number of distinct finite groups G such that π_e (G) =Γ. Here Γ is a set of positive integers, and π_e (G) is the set of element orders of G. It is proved that h (Γ) ∈ {0, 1, ∞} for Γis contained in {1...
展开
Let h(Γ) denote the number of distinct finite groups G such that π_e (G) =Γ. Here Γ is a set of positive integers, and π_e (G) is the set of element orders of G. It is proved that h (Γ) ∈ {0, 1, ∞} for Γis contained in {1, 2, 3, ...., 20}
收起
原文获取