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J. W. Wamsley 《Israel Journal of Mathematics》1972,11(3):297-298
LetG be a finitep-group,d(G)=dimH
1 (G, Z
p) andr(G)=dimH
2(G, Zp). Thend(G) is the minimal number of generators ofG, and we say thatG is a member of a classG
p
of finitep-groups ifG has a presentation withd(G) generators andr(G) relations. We show that ifG is any finitep-group, thenG is the direct factor of a member ofG
p
by a member ofG
p
. 相似文献
2.
Leather KE Bacak A Wamsley R Archibald AT Husk A Shallcross DE Percival CJ 《Physical chemistry chemical physics : PCCP》2012,14(10):3425-3434
A temperature and pressure kinetic study for the CH(3)O(2) + ClO reaction has been performed using the turbulent flow technique with a chemical ionisation mass spectrometry detection system. An Arrhenius expression was obtained for the overall rate coefficient of CH(3)O(2) + ClO reaction: k(10)(T) = (1.96(?0.24)(+0.28)) × 10(-11) exp[(-626 ± 35)/T] cm(3) molecule(-1) s(-1) where the uncertainty associated with the rate coefficient is given at the one standard deviation level. Over a range of pressure (100-200 Torr) and temperature (298-223 K) no pressure dependence is observed. The smaller rate coefficients measured at lower temperatures compared with both previous low temperature studies are believed to arise through the reduction of secondary chemistry and greater sensitivity in terms of reactant detection (hence much lower initial concentrations were employed). These new data reduce the effectiveness of ozone loss cycles involving reaction of CH(3)O(2) + ClO in the polar stratosphere by around a factor of 1.5 and restrict the importance of the reaction to the tropical and extra-tropical clean marine environments in the troposphere. 相似文献
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It is an open question whether or not every finitep-groupG has a presentation withd(G)=dimH
1(G,Z
p
) generators andr(G)=dimH
2(G, Z
p
) relations; in this article, a large number of examples are given to show that such a presentation does exist for nearly
all such groups for whichr(G) has been calculated. 相似文献
5.
Andrea Wamsley Pasit Phiasivongsa Bhaskara Jasti Xiaoling Li 《Journal of polymer science. Part A, Polymer chemistry》2006,44(14):4328-4337
Three different characterization methods—13C NMR spectroscopy, a terminal terpolymerization model, and a probability analysis based on the Poisson distribution—were used to determine the microstructure of random terpolymers. The methods were used to determine the amino acid sequence distribution of random terpolymers prepared from the polymerization of N‐carboxyanhydrides that contained L ‐leucine, β‐benzyl‐L ‐aspartate, and L ‐valine. Poly(L ‐leucine‐L ‐aspartic acid‐L ‐valine) [poly(LDV)] was designed as a target specific substrate for the α4β1 integrin that recognizes the tripeptide sequence leucine‐aspartic acid‐valine (LDV). The presence of the tripeptide sequence LDV within the polymer was determined to be eight LDV triad sequences on average in terpolymers of approximately 100 kDa. © 2006 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem 44: 4328–4337, 2006 相似文献
6.
IfG is a finite group thend(G) denotes the minimal number of generators ofG. IfH andK are groups then the extension, 1 →H →G →K → 1, is called an outer extension ofK byH ifd(G)=d(H)+d(K). Let
be the class of groups containing all finitep-groupsG which has a presentation withd(G) = dimH
1(G,z
p
) generators andr(G)=dimH
2 (G,Z
p
) relations: in this article it is shown that ifK is a non cyclic group belonging to
andH is a finite abelian p-group then any outer extension ofK byH belongs to
. 相似文献
7.
Juan J. Nájera Ruth Wamsley Deborah J. Last Kimberley E. Leather Carl J. Percival Andrew B. Horn 《国际化学动力学杂志》2011,43(12):694-707
In this paper, a real‐time laboratory study of the heterogeneous oxidation reaction of gas‐phase ozone with anthracene on surface substrates by using infrared spectroscopy in two distinctly different experimental configurations is reported. One set of kinetic measurements was made by attenuated total internal reflection infrared (ATR‐IR) spectroscopy using approximately 75‐nm films of anthracene adsorbed on ZnSe, for which the reactive uptake coefficient was determined to be (2.0 ± 1.1) × 10?7. Using an aerosol flow tube coupled to an infrared spectrometer (AFT‐IR), similar measurements were made on (NH4)2SO4 (ammonium sulfate) aerosols coated with a 0.1‐μm film of anthracene. The aerosol kinetic results as a function of the ozone concentration are consistent with a Langmuir–Hinshelwood‐type mechanism, for which the ozone‐partitioning coefficient was K = (1.4 ± 1.7) × 10?16 cm3 molecule?1, and the maximum pseudo‐first‐order rate coefficient was kImax = (0.035 ± 0.016) s?1. Infrared spectroscopic and mass spectrometric analysis of the ozonolysis reaction in the bulk phase identified the main ozonolysis products as dihydroxyanthrones, 9,10‐endoperoxide–anthracene, 9,10‐anthraquinone, and anthrone. Larger products were also seen in the mass spectra, most likely the result of secondary product and oligomer formation. © 2011 Wiley Periodicals, Inc. Int J Chem Kinet 43: 694–707, 2011 相似文献
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