1,889 research outputs found
Description by author Alex Irvine of his recent participation in the San Diego C
No full textDescription by author Alex Irvine of his recent participation in the San Diego Comic-Con, one of the largest conferences of comic/media/book producers and consumers. Irvine was there to promote his new fiction book, One King, One Soldier, published by Del Rey
Grand meteor of August 10, 1861. The august ring of meteors
No full textAlex. C. Twining. Grand meteor of August 10, 1861. The august ring of meteors. / H.A. Newto
Chronicles of the Cariboo: Dunlevy's Discovery of Gold on the Horsefly:
No full textwritten by Alex P. McInnes.Being a true story of the first discovery of gold in the Cariboo District on the Horsefly River by Peter C. Dunlevey
Infrastructure bottlenecks, private provision, and industrial productivity : a study of Indonesian and Thai cities
No full textThis research project followed an earlier similar project on Nigeria, applying the same methods. A sample of manufacturers was surveyed to document their responses to infrastructure deficiencies in electricity, water, transport, telecommunications, and waste disposal. They found the manufacturers undertook significant expenditures to offset deficiencies in publicly provided infrastructure services, and that changing public policy toward privately supplied infrastructure and changing the pricing of public infrastructure could yield significant savings in social costs. Thailand and Indonesia have made significant strides in following the policies for private sector participation in infrastructure provision. Nigeria, where public infrastructure monopolies still dominate, lags behind, yet stands to benefit most from such policy reform. Government policy toward the industrial organization and pricing of infrastructure sectors can significantly help a developing economy realize the benefits of private sector participation in the provision of infrastructure services.Banks&Banking Reform,Decentralization,Public Sector Economics&Finance,Environmental Economics&Policies,Municipal Financial Management,Banks&Banking Reform,Municipal Financial Management,Urban Services to the Poor,Urban Services to the Poor,Public Sector Economics&Finance
Informing Conservation: towards 14C wiggle-matching of short tree-ring sequences from medieval buildings in England
No full textThis study tested whether accurate dating by AMS radiocarbon wiggle-matching short tree-ring series (c. 30 annual rings) in the medieval period could be achieved., Scientific dating plays a central role in the conservation of historic buildings in England. Precise dating helps assess the significance of particular buildings or elements of their fabric, thus allowing us to make informed decisions about their repair and protection. Consequently considerable weight, both financial and legal, can be attached to the precision and accuracy of this dating. Dendrochronology is the method of choice, but in a proportion of cases this is unable to provide calendar dates. Hence we would like to be able to use radiocarbon wiggle-matching to provide a comparable level of precision and reliability, particularly on shorter tree-ring sequences (c. 30 annual growth rings) that up until now would not routinely be sampled. We present the results of AMS wiggle-matching five oak tree-ring sequences, spanning the period covered by the vast majority of surviving medieval buildings in England (c. AD 1180–1540) when currently we have only decadal and bidecadal calibration dat
Boat electrofishing survey of Te Weta Bay, Lake Rotoiti
No full textWe used New Zealand’s first successful electrofishing boat to survey fish in Lake Rotoiti, North Island, New Zealand, principally in Te Weta Bay. The primary objective of the fishing was to see if undesirable fish species such as koi carp (Cyprinus carpio haemaotopterus; Zhou et al. 2003), brown bullhead catfish (Ameiurus nebulosus), and rudd (Scardinius erythophthalmus) have become established. Circular excavations were seen in the lake by a NIWA SCUBA diver in late 2003, and these were similar to nest excavations associated with catfish in other locations.
The native fish common smelt (Retropinna retropinna) and bullies (Gobiomorphus sp) were caught, with a few goldfish(Carassius auratus). Poor water visibility made observations difficult in some parts of the lake, especially on the southern shore and in the outer part of Te Weta Bay closest to the main lake.
Fish densities ranged from 2.3 to 11.7 fish 100 m⁻². These should be regarded as minimal densities because the electroshoked fish were counter from the boat but mostly not retrieved; also, only a single pass was conducted.
No recognised pest fish species were caught, but we cannot exclude the possibility that pest fish might occur at sites that were not fished. No trout were caught, possible because of the high water temperature (22°C)
Sustainability and Bioethics
No full textGreen Open Access added to TU Delft Institutional Repository ‘You share, we take care!’ – Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.Ethics & Philosophy of Technolog
<sup>14</sup>C wiggle-matching of short tree-ring sequences from post-medieval buildings in England
No full textThis study tests whether accurate dating by AMS radiocarbon wiggle-matching short tree-ring series (c. 30 annual rings) in the period after AD 1510 can be achieved routinely. Such an approach has proved problematic for some intervals in the period AD 1160–1541 (Bayliss et al., 2017), which are before single-year calibration data are available (Stuiver, 1993). We suggest that such calibration data are essential if this approach is to be employed for the informed conservation of standing buildings.</p
Lithium Catalysed Sequence Selective Ring Opening Terpolymerisation: A Mechanistic Study
No full textThe catalytic construction of well-defined materials from mixtures of building blocks is an important challenge in sustainable catalysis. In this regard, we have recently reported a new type of selective ring-opening terpolymerisation (ROTERP), in which three monomers (A, B, C) are selectively enchained into a (ABAC)n sequence, but the reasons behind this unusual selectivity remained unanswered. In this study, we present a detailed investigation into the full ROTERP mechanism based on the reactivity of model intermediates, computational studies investigating >100 possible intermediates and transition states and reaction kinetics. Experimental verification of the intermediate speciation, the primary insertion steps and the side-reactions lets us show that although most insertions and side-reactions are thermodynamically viable, kinetic selection processes at the propagating chain end determine the sequence selectivity. Computational studies elucidate the special role and speciation of the Lithium catalyst which during the catalytic cycle involves mono-metallic, bi-metallic and charge separated transitions states comprising both coordinative activation of incoming monomers and functional groups of the polymer backbone adjacent to the propagating chain. Our study not only deciphers the mechanism of a rare selective terpolymerisation but also helps answering open questions relevant to ring-opening copolymerisation (ROCOP) and alkali-metal catalysis in general, thus guiding the design of future polymerisation catalysis for degradable materials
Structural changes of synthetic paulingite (Na,H-ECR-18) upon dehydration and CO2 adsorption
No full textFunding: EPSRCThe structure of dehydrated calcined ECR-18, synthetic paulingite, topology type PAU, unit cell composition Na132H28Si512Al160O1344, has been determined by Rietveld refinement against synchrotron X-ray powder diffraction data. Upon dehydration the symmetry of Na,H-ECR-18 changes from Im3m to I 43m, with a corresponding decrease of cubic unit cell a parameter from 34.89412(1) A to 33.3488(3) A. This occurs as the framework distorts to afford closer coordination of Na+ cations by framework O atoms in 8-ring window sites of the seven cage types present. Na+ cations in 8R sites block the access of N2 molecules to the internal pore space at 77 K but CO2 adsorption at 308 K is observed, and is postulated to occur via a 'trapdoor' mechanism. In situ PXRD during CO2 adsorption at pressures up to 10 bar show reversible broadening of diffraction peaks that is attributed to local crystallographic strain.Peer reviewe
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