排序方式: 共有19条查询结果,搜索用时 31 毫秒
1.
Joe Gildea 《Czechoslovak Mathematical Journal》2011,61(2):531-539
The structure of the unit group of the group algebra of the group A4 over any finite field of characteristic 2 is established
in terms of split extensions of cyclic groups. 相似文献
2.
3.
Martinho PN Ortin Y Gildea B Gandolfi C McKerr G O'Hagan B Albrecht M Morgan GG 《Dalton transactions (Cambridge, England : 2003)》2012,41(25):7461-7463
A hysteretic spin transition is induced in a solution assembly of a mononuclear Fe(III) amphiphilic complex which exhibits only gradual spin crossover in the solid state. The hysteretic behavior is dependent on dynamic solution assembly and removal of solvent causes reversion to the original bulk solid magnetic response. 相似文献
4.
Joe Gildea 《Results in Mathematics》2012,61(3-4):245-254
The Structure of the Unit Group of the Group Algebra of the groups ${C_4 \rtimes C_4}$ and G 4,4 over any field of characteristic 2 is established. 相似文献
5.
R.W. Deitcher J.E. RomeP.A. Gildea J.P. O’ConnellE.J. Fernandez 《Journal of chromatography. A》2010,1217(2):199-208
A new thermodynamic model is derived that describes both loading and pulse-response behavior of proteins in hydrophobic interaction chromatography (HIC). The model describes adsorption in terms of protein and solvent activities, and water displacement from hydrophobic interfaces, and distinguishes contributions from ligand density, ligand type and protein species. Experimental isocratic response and loading data for a set of globular proteins on Sepharose™ resins of various ligand types and densities are described by the model with a limited number of parameters. The model is explicit in ligand density and may provide insight into the sensitivity of protein retention to ligand density in HIC as well as the limited reproducibility of HIC data. 相似文献
6.
Dougherty Steven T. Gildea Joe Korban Adrian Kaya Abidin 《Designs, Codes and Cryptography》2021,89(7):1615-1638
Designs, Codes and Cryptography - In this work, we define composite matrices which are derived from group rings. We extend the idea of G-codes to composite G-codes. We show that these codes are... 相似文献
7.
Dr. Komala Pandurangan Brendan Gildea Dr. Caroline Murray Dr. Charles J. Harding Dr. Helge Müller‐Bunz Dr. Grace G. Morgan 《Chemistry (Weinheim an der Bergstrasse, Germany)》2012,18(7):2021-2029
Six solvated salts of a mononuclear manganese(III) complex with a chelating hexadentate Schiff base ligand are reported. One member of the series, [MnL]PF6.0.5 CH3OH ( 1 ), shows a rare low‐spin (LS) electronic configuration between 10–300 K. The remaining five salts, [MnL]NO3? C2H5OH ( 2 ), [MnL]BF4?C2H5OH ( 3 ), [MnL]CF3SO3?C2H5OH ( 4 ), [MnL]ClO4?C2H5OH ( 5 ) and [MnL]ClO4?0.5 CH3CN ( 6 ), all show gradual incomplete spin‐crossover (SCO) behaviour. The structures of all were determined at 100 K, and also at 293 K in the case of 3 – 6 . The LS salt [MnL]PF6.0.5 CH3OH is the only member of the series that does not exhibit strong hydrogen bonding. At 100 K two of the four SCO complexes ( 2 and 4 ) assemble into 1D hydrogen‐bonded chains, which weaken or rupture on warming. The remaining SCO complexes 3 , 5 and 6 do not form 1D hydrogen‐bonded chains, but instead exhibit discrete hydrogen bonding between cation/counterion, cation/solvent or counterion/solvent and show no significant change on warming. 相似文献
8.
Kuhn H Demidov VV Coull JM Fiandaca MJ Gildea BD Frank-Kamenetskii MD 《Journal of the American Chemical Society》2002,124(6):1097-1103
Molecular beacons are sensitive fluorescent probes hybridizing selectively to designated DNA and RNA targets. They have recently become practical tools for quantitative real-time monitoring of single-stranded nucleic acids. Here, we comparatively study the performance of a variety of such probes, stemless and stem-containing DNA and PNA (peptide nucleic acid) beacons, in Tris-buffer solutions containing various concentrations of NaCl and MgCl(2). We demonstrate that different molecular beacons respond differently to the change of salt concentration, which could be attributed to the differences in their backbones and constructions. We have found that the stemless PNA beacon hybridizes rapidly to the complementary oligodeoxynucleotide and is less sensitive than the DNA beacons to the change of salt thus allowing effective detection of nucleic acid targets under various conditions. Though we found stemless DNA beacons improper for diagnostic purposes due to high background fluorescence, we believe that use of these DNA and similar RNA constructs in molecular-biophysical studies may be helpful for analysis of conformational flexibility of single-stranded nucleic acids. With the aid of PNA "openers", molecular beacons were employed for the detection of a chosen target sequence directly in double-stranded DNA (dsDNA). Conditions are found where the stemless PNA beacon strongly discriminates the complementary versus mismatched dsDNA targets. Together with the insensitivity of PNA beacons to the presence of salt and DNA-binding/processing proteins, the latter results demonstrate the potential of these probes as robust tools for recognition of specific sequences within dsDNA without denaturation and deproteinization of duplex DNA. 相似文献
9.
Bell A Jurafsky D Fosler-Lussier E Girand C Gregory M Gildea D 《The Journal of the Acoustical Society of America》2003,113(2):1001-1024
Function words, especially frequently occurring ones such as (the, that, and, and of), vary widely in pronunciation. Understanding this variation is essential both for cognitive modeling of lexical production and for computer speech recognition and synthesis. This study investigates which factors affect the forms of function words, especially whether they have a fuller pronunciation (e.g., thi, thaet, aend, inverted-v v) or a more reduced or lenited pronunciation (e.g., thax, thixt, n, ax). It is based on over 8000 occurrences of the ten most frequent English function words in a 4-h sample from conversations from the Switchboard corpus. Ordinary linear and logistic regression models were used to examine variation in the length of the words, in the form of their vowel (basic, full, or reduced), and whether final obstruents were present or not. For all these measures, after controlling for segmental context, rate of speech, and other important factors, there are strong independent effects that made high-frequency monosyllabic function words more likely to be longer or have a fuller form (1) when neighboring disfluencies (such as filled pauses uh and um) indicate that the speaker was encountering problems in planning the utterance; (2) when the word is unexpected, i.e., less predictable in context; (3) when the word is either utterance initial or utterance final. Looking at the phenomenon in a different way, frequent function words are more likely to be shorter and to have less-full forms in fluent speech, in predictable positions or multiword collocations, and utterance internally. Also considered are other factors such as sex (women are more likely to use fuller forms, even after controlling for rate of speech, for example), and some of the differences among the ten function words in their response to the factors. 相似文献
10.
Steven T. Dougherty Joseph Gildea Rhian Taylor Alexander Tylyshchak 《Designs, Codes and Cryptography》2018,86(9):2115-2138
We describe G-codes, which are codes that are ideals in a group ring, where the ring is a finite commutative Frobenius ring and G is an arbitrary finite group. We prove that the dual of a G-code is also a G-code. We give constructions of self-dual and formally self-dual codes in this setting and we improve the existing construction given in Hurley (Int J Pure Appl Math 31(3):319–335, 2006) by showing that one of the conditions given in the theorem is unnecessary and, moreover, it restricts the number of self-dual codes obtained by the construction. We show that several of the standard constructions of self-dual codes are found within our general framework. We prove that our constructed codes must have an automorphism group that contains G as a subgroup. We also prove that a common construction technique for producing self-dual codes cannot produce the putative [72, 36, 16] Type II code. Additionally, we show precisely which groups can be used to construct the extremal Type II codes over length 24 and 48. We define quasi-G codes and give a construction of these codes. 相似文献