J.L. Bates

The electrical conductivity of nearly stoichiometric single‐crystal and polycrystalline uranium dioxide was measured from room temperature to 3000°K. Below approximately 550°K, the curve of log σ versus T −1 is linear with a calculated activation energy of approximately 0.17 ev. Between 550° and 1250°K, however, the shape of the curve changes; this change varies from one specimen to another. The electrical conductivity increases rapidly with increasing temperature above 1250°K with a change from

In the 12,000 years preceding the Industrial Revolution, human activities led to significant changes in land cover, plant and animal distributions, surface hydrology, and biochemical cycles. Earth system models suggest that this anthropogenic land cover change influenced regional and global climate. However, the representation of past land use in earth system models is currently oversimplified. As a result, there are large uncertainties in the current understanding of the past and current state

The nature and timing of rice domestication and the development of rice cultivation in South Asia is much debated. In northern South Asia there is presently a significant gap (<i>c</i>.4200 years) between earliest evidence for the exploitation of wild rice (Lahuradewa <i>c</i>.6000 BCE) and earliest dated evidence for the utilisation of fully domesticated rice (Mahagara <i>c</i>.1800 BCE). The Indus Civilisation (<i>c.</i>3000-1500 BCE) developed and declined during the intervening period, and t

The electrical conductivities of single crystal and polycrystalline MgAl 2 O 4 and Y 3 Al 5 O 12 were measured to 1260 K using a three‐contact, guard‐ring technique. The electrical conduction mechanisms change with temperature, with anomalous oxygen pressure and time‐dependent inflections in log σ versus T −1 curves between 900 to 1000 K. The conduction processes of Y 3 Al 5 O 12 and MgAl 2 O 4 appear to be similar and possibly related to A1 3+ ion diffusion.

This paper presents a preliminary study combining macrobotanical and phytolith analyses to explore crop processing at archaeological sites in Haryana and Rajasthan, northwest India. Current understanding of the agricultural strategies in use by populations associated with South Asia's Indus Civilisation (3200-1900 bc) has been derived from a small number of systematic macrobotanical studies focusing on a small number of sites, with little use of multi-proxy analysis. In this study both phytolith

The dissolution of Al 2 O 3 , MgAl 2 O 4 . Y 3 Al 5 O 12 , MgO, and other refractory oxides in molten Ca‐Al silicates is heterogeneous over significant temperature and silicate composition ranges with the formation of at least one solid reaction product at the oxide‐silicate interface.

The absorption spectra for single crystal and polyerystalline UO2 have been measured between 0.6 and 15 μm at room temperature. The spectrum for UO2 resembles that of a typical semiconductor, opaque in the visible but transparent over a large portion of the infrared. An absorption edge is located at approximately 0.6 μm (2.0 eV). A large optical window extends from 3 to 13 μm.The absorption coefficient for single crystal UO2 has been determined between 1.5 and 15 μm. A maximum value of 57 cm-1 w

773 K. The standard deviation is 7.4% for the 48 test results reported by seven participating laboratories for fibrous alumina-silica. The standard deviation is 8.0% for the 58 test results reported for calcium silicate.

Abstract Several major cereal groups have been identified as staples used by the pre-urban, urban and post-urban phase populations of the Indus Civilisation (3200–1500 BCE): wheat, barley, a range of small hulled millets and also rice, though their proportional exploitation is variable across space and over time. Traditional quantification methods examine the frequency, intensity and proportionality of the use of these crops and help ascertain the ‘relative importance’ of these cereals for Indus

The collection of this dataset of published archaeobotanical data from the Indus Civilisation (c.3200–1500BC) was carried out by the author as part of her doctoral work, and has continued up to October 2017. The dataset represents a systematic collation of all primary published macrobotanical data, regardless of their designation as ‘crop’, ‘fully domesticated’ or ‘wild/weedy’ species. The dataset comprises 63 sites and 339 ‘taxa’ (including less confidently identified elements such as ‘charred