排序方式: 共有30条查询结果,搜索用时 31 毫秒
1.
Patterson JR Barker A Briere RA Gibbons LK Makoff G Papadimitriou V Somalwar S Wah YW Winstein B Winston R Woods M Yamamoto H Swallow E Bock GJ Coleman R Enagonio J Hsiung YB Stanfield K Stefanski R Yamanaka T Blair G Gollin GD Karlsson M Okamitsu JK Tschirhart R Brisson JC Debu P Peyaud B Turlay R Vallage B 《Physical review letters》1990,64(13):1491-1494
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Patrycja Wytrych Jzef Utko Julia Kak Maciej Ptak Mariusz Stefanski Tadeusz Lis Jolanta Ejfler ukasz John 《Molecules (Basel, Switzerland)》2022,27(1)
In alkali metal and lanthanide coordination chemistry, triphenylsiloxides seem to be unduly underappreciated ligands. This is as surprising as that such substituents play a crucial role, among others, in stabilizing rare oxidation states of lanthanide ions, taking a part of intramolecular and molecular interactions stabilizing metal-oxygen cores and many others. This paper reports the synthesis and characterization of new lithium [Li4(OSiPh3)4(THF)2] (1), and sodium [Na4(OSiPh3)4] (2) species, which were later used in obtaining novel gadolinium [Gd(OSiPh3)3(THF)3]·THF (3), and erbium [Er(OSiPh3)3(THF)3]·THF (4) configuration, it can result in res were determined for all 1–4 compounds, and in addition, IR, Raman, absorption spectroscopy studies were conducted for 3 and 4 lanthanide compounds. Furthermore, direct current (dc) variable-temperature magnetic susceptibility measurements on polycrystalline samples of 3 and 4 were carried out in the temperature range 1.8–300 K. The 3 shows behavior characteristics for the paramagnetism of the Gd3+ ion. In contrast, the magnetic properties of 4 are dominated by the crystal field effect on the Er3+ ion, masking the magnetic interaction between magnetic centers of neighboring molecules. 相似文献
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This paper reports on development of a method for quantifying two measures of mixing, the scale and intensity of segregation, through flow visualization, video recording, and software analysis. This non-intrusive method analyzes a planar cross section of a flowing system from an instantaneous data record, thereby eliminating the need for statistical analysis of a large number of point measurements at multiple locations throughout the system to characterize the mixing. The method is applied to a cold flow model of a high temperature, gas/solid reactor so that reactor design and operation can be optimized to promote reaction efficiency. This method may be useful for studying a variety of mixing systems in which multiphase components or tracers are visually distinguishable.List of symbols
mixing coefficient (defined by Eq. (17))
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standard deviation
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a
mixing coefficient (defined by Eq. (16))
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C(k, m)
sample grayscale covariance (defined by Eq. (3))
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d
distance (defined by Eq. (8))
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D
divisor (defined by Eq. (3))
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d
*
value of d for which R
I
(d) approaches zero
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D
50
mass median diameter
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I
intensity of segregation (defined by Eq. (20))
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M
sample size (defined by Eq. (16))
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n
number of contiguous pixels
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n
*
value of n for which SSE
Q
/SSE
L
is maximized
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n
c
number of columns of pixels
- NR
number of rows of pixels
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P
number of pixels per linear distance
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r
radius of Cold Flow Model
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R(k, m)
sample correlation function (defined by Eq. (5))
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R
C
(k)
column correlation function (defined by Eq. (7))
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R
I
(d)
isotropic correlation function (defined by Eq. (9))
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R
R
(m)
row correlation function (defined by Eq. (6))
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SSE
Q
residual sum of squared errors from the least squares fit of the quadratic model to Eq. (14)
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SSE
L
residual sum of squared errors from the least squares fit of the linear model to Eq. (14)
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S
y
2
sample grayscale variance (defined by Eq. (2))
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S
c
column scale of segregation (defined by Eqs. (7) and (13))
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S
D
Danckwerts' scale of segregation (defined by Eq. (10))
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S
R
row scale of segregation (defined by Eqs. (6) and (13))
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S
s
scale measure developed in this paper (defined by Eq. (13))
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V
n
sample variance of contiguous pixels (defined by Eq. (11))
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V
n
*
normalized variance function (defined by Eq. (12))
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sample grayscale mean (defined by Eq. (1))
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Y
i,j
grayscale value at pixel (i,j) 相似文献
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Andrzej Stefanski 《Chaos, solitons, and fractals》2000,11(15):2443-2451
The method of estimation of the largest Lyapunov exponent for mechanical systems with impacts using the properties of synchronization phenomenon is demonstrated. The presented method is based on the coupling of two identical dynamical systems and is tested on the classical Duffing oscillator with impacts. 相似文献
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Aguilar-Arevalo AA Anderson CE Brice SJ Brown BC Bugel L Conrad JM Dharmapalan R Djurcic Z Fleming BT Ford R Garcia FG Garvey GT Mirabal J Grange J Green JA Imlay R Johnson RA Karagiorgi G Katori T Kobilarcik T Linden SK Louis WC Mahn KB Marsh W Mauger C Metcalf W Mills GB Moore CD Mousseau J Nelson RH Nguyen V Nienaber P Nowak JA Osmanov B Pavlovic Z Perevalov D Polly CC Ray H Roe BP Russell AD Schirato R Shaevitz MH Sorel M Spitz J Stancu I Stefanski RJ Tayloe R Tzanov M Van de Water RG 《Physical review letters》2010,105(18):181801
The MiniBooNE experiment at Fermilab reports results from a search for ˉν_{μ}→ˉν_{e} oscillations, using a data sample corresponding to 5.66×102? protons on target. An excess of 20.9±14.0 events is observed in the energy range 475相似文献
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S. Sabarathinam K. Thamilmaran L. Borkowski P. Perlikowski P. Brzeski A. Stefanski T. Kapitaniak 《Communications in Nonlinear Science & Numerical Simulation》2013,18(11):3098-3107
The dynamics of two coupled, dissipatively perturbed, near-integrable Hamiltonian, double-well Duffing oscillators has been studied. We give numerical and experimental (circuit implementation) evidence that in the case of small positive or negative damping there exist two different types of transient chaos. After the decay of the transient chaos in the neighborhood of chaotic saddle we observe the transient chaos in the neighborhood of unstable tori. We argue that our results are robust and they exist in the wide range of system parameters. 相似文献
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Mnich Konrad Lazarek Mateusz Stefanski Andrzej Perlikowski Przemyslaw 《Meccanica》2022,57(8):1955-1973
Meccanica - This paper presents the experimental identification of the friction force in the inerter with constant and variable inertance. The change of intertance is possible due to the... 相似文献
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Bächler J Bartke J Bialkowska H Bock R Brockmann R Buncic P Chase SI Derado I Eckardt V Eschke J Ferenc D Fleischmann B Foka P Fuchs M Gazdzicki M Gladysz E Harris JW Heck W Hoffmann M Jacobs PM Kabana S Kadija K Keidel R Kosiec J Kowalski M Kühmichel A Lahanas M Lee JY Ljubicic A Margetis S Morse R Nappi E Odyniec G Paic G Panagiotu AD Petridis A Piper A Posa F Poskanzer AM Pugh HG Pühlhofer F Rai G Rauch W Renfordt R Röhrich D Roland G Rothard H Runge K Sandoval A Schambach JJ Schmitz N 《Physical review letters》1994,72(10):1419-1422