3,573 research outputs found
Declaration of the causes which impel the state of Texas to secede from the Federal Union : also the ordinance of secession. [Austin, Tex.? : Herald office, 1861]
No full textCaption title.; "Done by the people of the state of Texas, in Convention assembled at Austin, this first day of February, A.D. 1861."; Printed on satin.; Secession--Texas.; Texas--Politics and government--Civil War, 1861-1865.; United States--P
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Palaeoenvironment of a mesolithic peat bed from Austin Friars, Leicester
No full textA mesolithic peat bed, dated to 9920±100 bp (HAR-4260) (bp = radiocarbon years before the present calculated from A.D. 19S0 within + or - of 100 years in this case. Ed.) was recovered from Austin Friars, Leicester. Analysis of preserved fauna and flora, especially insects and seeds, indicated that the peat had formed in a shallow pond or lake, with vegetated, marshy edges subject to periodic flooding. The pond was set in open countryside characterised by a lack of trees and preponderance of light-demanding species, living in a cold, damp tundra climate at the very end of Late Glacial Zone III (9000-8300 RC.) extending into the Post Glacial (8300-4000 RC.)
Invertebrate biodiversity and conservation : special issue
No full textA.D. Austin, D.A. Mackay and S.J.B. Coope
Theoretical analysis of a methane gas detection system using the complementary source modulation of correlation spectroscopy
No full textResults from simulations of the response of a methane gas sensor using optical correlation spectroscopy (CoSp) are presented. Predictions of the sensor response, signal/noise performance and detection sensitivity are made for a typical fibre optic-coupled system. Spectral absorption data of the gases is obtained from the publicly available HITRAN database. Emphasis is placed on the effects on the detection sensitivity of varying (a) the optical filter characteristics, i.e. center wavelength and bandwidth, and (b)the concentration (partial pressure) of CH4 a theoretical noise-limited detection limit below 1 ppm is predicted. The cross-sensitivity to water vapor is derived and compared to that which would occur with a conventional broadband absorption method, i.e. one that would not exhibit the same selectivity as the CoSp method. This work is important for predicting the responsivity, sensitivity and crosstalk performance of practical CoSp gas detection systems
Experimental sensing of CO<sub>2</sub> and CH<sub>4</sub> gases using the CoSM correlation spectroscopy method and comparison with simulated predictions from the HITRAN database
No full textThis paper describes recent experimental results on the detection of carbon dioxide and methane gases using the complementary source modulation (CoSM) method, the topology of which is shown in figure 1, and compares these with numerical simulations from data derived from the HITRAN database. There is a particular interest in sensors using optical fibres coupled to a passively coupled sensing head. CO have reasonably strong absorption bands in the 2.0 µm and 2.3 µm spectral regions respectively. That of methane in the 2.3 µm band is less suited for propagation over fibre lengths greater than a few metres, so the somewhat weaker absorption band at 1.6 µm is more suited to sensing over extended fibre networks. Analyses have been conducted for both of these gases and results will be presented for the prediction of modulation index, signal/noise ratio and detection sensitivity for these gases. Experimental results for these gases, using the CoSM method will be presented for the first time, and comparisons with simulations made
Theoretical analysis of a CO<sub>2</sub> gas detection system using correlation spectroscopy
No full textWe present a comprehensive model of a CO2 correlation spectroscopy based gas sensor. Predictions of the sensor response for typical fibre optic-coupled systems are made, taking into account effects of noise in detected signals
Some effects of the initiator on the cationic polymerization of alkenes
No full textThe content of this article is indicated by what could be its full title: “An Explanation of the dependence of the rate of the cationic polymerizations of alkenes and of the DP of their products, on the reaction variables, especially the size of the anionic moiety of the initiator.” We continue here the discussion started in 1965 and show mathematically how the theory of dieidic polymerizations by unpaired and paired cations can explain why some of these polymerizations become faster with falling temperature, why the Arrhenius plot of the DP of the polymers obtained from most such systems shows a discontinuity or kink, and also how the temperature of minimum rate, TM, and that at which the kink occurs, TK, depend on the reaction variables, namely the concentrations of monomer, m, and of initiator, c, and the a, D, and T (interionic distance in the ion-pair, dielectric constant of the reaction mixture and temperature). Our treatment explains why the most effective way of achieving the economically desirable aim, to make the longest polymers at the highest possible temperatures, is by maximizing the product a.D, so as to increase the TK, preferably by the use of polar solvents and initiators with large anions. The choice of such combinations by several investigators, but for other, vaguer, reasons, is given here a theoretical basis. Our argument is illustrated by Literature examples and is presented in the form of a new diagram (the Plesch-Austin plot) which shows the TK as a function of a.D for several systems. © 2008 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem 46: 4265–4284, 200
The aulacid wasp fauna of Western Australia with descriptions of six new species
No full textJennings, J.T., Austin, A.D. and Stevens, N.B
Introduction and spread of four Aculeate Hymenoptera in Italy, Sardinia and Corsica. In: Austin A.D. & Dowton M. (eds.) International Hymenopterist Conference, Camberra, A.C.T., CSIRO publ.: 290-295
No full textTrain bearing Emilio Carranza's body in Austin July 21, 1928
No full textPhotograph of a train bearing Emilio Carranza's body as it stops in Austin on its way back to Mexico. From verso: "Emilio Carranza was a famous Mexican 'Ace' who was killed in an accident in New Jersey just after he had taken off for Mexico City where his bride of four months awaited him. His father Sebastian Carranza accompanied the body. At various stops along the way from New York to Mexico, recognition was given the flying ace. In Austin members of state and city governments met the train as well as members of the Chamber of Commerce: Max Bickler, J.A. Nichols, A.D. Bolm, Sam Sparks, Horace Barnhart, John D. Miller, James W. Bass, Lynn Hunter, A.D. Boone, Walter Murray, Martin Andersen, Walter Seaholm, R. Niles Graham, H.H. Luedecke, J. W. Ezelle, and Walter E. Long.
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