30,115 research outputs found
Direct numerical test of the B-G-K model equation by the DSMC method
No full textIn the present paper the rarefied gas how caused by the sudden change of the wall temperature and the Rayleigh problem are simulated by the DSMC method which has been validated by experiments both in global flour field and velocity distribution function level. The comparison of the simulated results with the accurate numerical solutions of the B-G-K model equation shows that near equilibrium the BG-K equation with corrected collision frequency can give accurate result but as farther away from equilibrium the B-G-K equation is not accurate. This is for the first time that the error caused by the B-G-K model equation has been revealed
G. K. Chesterton Portrait, Detail
No full textThis image is a detail of the oil portrait of the British author G. K. Chesterton (1874–1936), painted by Edwin Swan.https://collected.jcu.edu/chestertonimages/1001/thumbnail.jp
A study on the reliability of consecutive k-Out-of-n: G systems based on Copula
No full textThe computation of reliability characteristics of a system that consists of dependent components is sometimes difficult especially when the type of dependence is not known. This article introduces the copula method to calculate the reliability of dependent consecutive k-out-of-n: G systems. The components in these systems are dependent on each other and the dependency may be either linear or nonlinear. The copula is a popular tool for modeling the dependence structure of data. It contains the information about the dependency structure of a vector of random variables and can capture nonlinear dependence. Based on the copula theory, the article analyzes the consecutive k-out-of-n: G systems and gets the reliability indexes. Finally, some numerical examples are presented to illustrate the results obtained in this article.Peer reviewe
G. K. Chesterton Portrait
No full textThis item is an oil portrait of the British author G. K. Chesterton (1874–1936). It was painted by the Irish artist Edwin Swan. The portrait measures approximately 44.5 by 34 inches. This portrait is based on a black-and-white photograph of Chesterton taken in 1935 by the British photographer Howard Coster (1885-1959). This is a posthumous portrait, painted after Chesterton’s death in 1936.
Edwin Swan was born in Ballyragget, Ireland, and studied at the Academie Julian in Paris. This portrait of Chesterton was once exhibited at the Royal Academy in 1940.https://collected.jcu.edu/chestertonimages/1000/thumbnail.jp
The numbers of dependent k-sets in a graph are log concave
No full textA set of vertices in a graph is said to be dependent if it is not independent. Let p(k)(G) denote the number of dependent sets of size k in the graph G. We show that, for any graph G, the sequence {p(k)(G)} is logarithmically concave. (C) 2001 Elsevier Science.PT: J; CR: ANDERSON I, 1987, COMBINATORICS FINITE BONDY JA, 1976, GRAPH THEORY APPL BRENTI F, 1994, CONT MATH, V178, P71 HAMIDOUNE YO, 1990, J COMB THEORY B, V50, P241 HORROCKS DGC, 1999, EUR J COMBIN, V20, P131 HORROCKS DGC, 2000, AUSTRALAS J COMBIN, V22, P105 STANLEY RP, 1989, ANN NY ACAD SCI, V576, P500 WAGNER DG, 2001, J COMB THEORY A, V94, P383 ZHA XY, 1989, EUR J COMBIN, V10, P603; NR: 9; TC: 2; J9: J COMB THEOR B; PG: 6; GA: 517RGSource type: Electronic(1
Measurement of the ratio of branching fractions B(B0→K∗0γ )/B(B0s→φγ ) and the directCP asymmetry inB 0→K∗0γ
No full textThe ratio of branching fractions of the radiative B decays B0→K⁎0γ and B0s→ϕγ has been measured using an integrated luminosity of 1.0 fb−1 of pp collision data collected by the LHCb experiment at a centre-of-mass energy of s√=7TeV. The value obtained is
B(B0→K⁎0γ)B(B0s→ϕγ)=1.23±0.06(stat.)±0.04(syst.)±0.10(fs/fd),
where the first uncertainty is statistical, the second is the experimental systematic uncertainty and the third is associated with the ratio of fragmentation fractions fs/fd. Using the world average value for B(B0→K⁎0γ), the branching fraction B(B0s→ϕγ) is measured to be (3.5±0.4)×10−5.
The direct CP asymmetry in B0→K⁎0γ decays has also been measured with the same data and found to be
ACP(B0→K⁎0γ)=(0.8±1.7(stat.)±0.9(syst.))%.
Both measurements are the most precise to date and are in agreement with the previous experimental results and theoretical expectations
Dispelling the Myths Behind First-author Citation Counts
No full textWe conducted a full-scale evaluative citation analysis study of scholars in the XML research field to explore just how different from each other author rankings resulting from different citation counting methods actually are, and to demonstrate the capability of emerging data and tools on the Web in supporting more realistic citation counting methods. Our results contest some common arguments for the continued
use of first-author citation counts in the evaluation of scholars, such as high correlations between author rankings by first-author citation counts and other citation
counting methods, and high costs of using more realistic citation counting methods that are not well-supported by the ISI databases. It is argued that increasingly available digital full text research papers make it possible for citation analysis studies to go beyond what the ISI databases have directly supported and to employ more
sophisticated methods
SOMATISKIE FRAZEOLOĢISMI K. ULMAŅA LATVIEŠU-VĀCU VĀRDNĪCĀ (1872) UN K. ULMAŅA / G. BRAŽES VĀCU-LATVIEŠU VĀRDNĪCĀ (1880)
No full textThe paper analyses Latvian and German somatic idioms in the dictionaries by K. Ulmann and K. Ulmann / G. Braže. Up to now the researchers of Latvian phraseology have not focused to analyse these theme – especially in diachronic aspect. The paper presents the most fixed somatic idioms in the Latvian and German and their equivalence types. The author compares with the meanings of idioms from the first dictionary (1638) to modern electronic dictionary “Modern Latvian dictionary”.KEY WORDS: the dictionaries by K. Ulmann and K. Ulmann / G. Braže, somatic idioms, somatic components, the equivalence types of German–Latvian somatic idioms.DOI: http://dx.doi.org/10.15181/rh.v19i0.132
First observation of the decay Bs0→K*0K*0
No full textThe first observation of the decay B0s→K∗0K∗0 is reported using 35 pb−1 of data collected by LHCb in proton–proton collisions at a centre-of-mass energy of 7 TeV. A total of 49.8±7.5 B0s→(K+π−)(K−π+) events are observed within ±50 MeV/c2 of the B0s mass and 746 MeV/c2 < mKπ < 1046 MeV/c2, mostly coming from a resonant B0s→K∗0K∗0 signal. The branching fraction and the CP-averaged K∗0 longitudinal polarization fraction are measured to be B(B0s→K∗0K∗0)=(2.81±0.46(stat.)±0.45(syst.)±0.34(fs/ fd))×10−5 and fL =0.31±0.12(stat.)±0.04(syst.)
Quantum tunneling time delay investigation of K+ ion in human telomeric G-quadruplex systems
No full text© 2023, The Author(s), under exclusive licence to Society for Biological Inorganic Chemistry (SBIC).Guanine-rich quadruplex DNA (G-quadruplex) is of interest both in cell biology and nanotechnology. Its biological functions necessitate a G-quadruplex to be stabilized against escape of the monovalent metal cations. The potassium ion (K+) is particularly important as it experiences a potential energy barrier while it enters and exits the G-quadruplex systems which are normally found in human telomere. In the present work, we analyzed the time it takes for the K+ cations to get in and out of the G-quadruplex. Our time estimate is based on entropic tunneling time—a time formula which gave biologically relevant results for DNA point mutation by proton tunneling. The potential energy barrier experienced by K+ ions is determined from a quantum mechanical simulation study, Schrodinger equation is solved using MATLAB, and the computed eigenfunctions and eigenenergies are used in the entropic tunneling time formula to compute the time delay and charge accumulation rate during the tunneling of K+ in G-quadruplex. The computations have shown that ion tunneling takes picosecond times. In addition, average K+ accumulation rate is found to be in the picoampere range. Our results show that time delay during the K+ ion tunneling is in the ballpark of the conformational transition times in biological systems, and it could be an important parameter for understanding its biological role in human DNA as well as for the possible applications in biotechnology. To our knowledge, for the first time in the literature, time delay during the ion tunneling from and into G-quadruplexes is computed. Graphical abstract: [Figure not available: see fulltext.
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