International trade in outland resources: the mining and export of lead in early medieval England in light of new isotope data from York

THE PROCUREMENT AND TRADE OF VALUABLE ‘outland’ resources was fundamental to the early medieval economy, linking upland, forested and coastal regions with emerging urban markets. Recent research has detailed the increased exploitation and production of raw materials, including tar, soapstone, iron and antler, in the centuries prior to and during the Viking Age, primarily within Scandinavia. Here, it is argued from new isotope data relating to lead from 9th- to 11th-century York that there was an additional, international trade in a valuable but non-precious outland resource. Lead mined from the North Pennines was exported across the North Sea on a significant scale, connecting the remote uplands of northern England with urban nodes including York, Kaupang (Norway) and Hedeby (Germany; historically Denmark). We argue that North Pennines lead was part of a wider early medieval English lead export industry that operated from at least the mid-8th century ad

Sources of early Islamic silver: lead isotope analysis of dirhams

The expansion of the early Islamic state (c. AD 700–900) was underpinned by the minting of silver coins (dirhams) on an enormous scale. While the wider effects of this coinage have been studied extensively, the sources of silver have attracted less attention and research has relied on literary texts pointing to mines in Arabia and Central Asia. Here, the authors use lead isotope and trace element analyses of more than 100 precisely dated silver coins to provide a geochemical perspective on Islamic silver. The results identify multiple new sources, stretching from Morocco to the Tien Shen, and indicate an Abbasid-period mining boom. These source locations have implications for contemporary geopolitics including on the Islamic-Byzantine frontier

Byzantine plate and Frankish mines: the provenance of silver in north-west European coinage during the Long Eighth Century (c. 660–820)

The late seventh century introduction of silver coinage marked a transformation in the economy of North-West Europe, yet the source(s) of silver bullion remains enigmatic. Here, we provide new insights into European silver sources through the ‘long eighth century’ (c. 660-820 AD) via the lead isotope and trace element analysis of 49 coins from England, Frisia and Francia. The results indicate an early reliance on Byzantine silver, followed from c. 750 by a shift to metal from Frankish mines. They generate new insights into the motives for minting, and reveal the strong role of the state in controlling metal resources

Association of Childhood Psychosocial Environment With 30-Year Cardiovascular Disease Incidence and Mortality in Middle Age

Background Childhood adversity and trauma have been shown to be associated with poorer cardiovascular disease (CVD) outcomes in adulthood. However, longitudinal studies of this association are rare. Methods and Results Our study used the CARDIA (Coronary Artery Risk Development in Young Adults) Study, a longitudinal cohort that has followed participants from recruitment in 1985-1986 through 2018, to determine how childhood psychosocial environment relates to CVD incidence and all-cause mortality in middle age. Participants (n=3646) completed the Childhood Family Environment (CFE) questionnaire at the year 15 (2000-2001) CARDIA examination and were grouped by high, moderate, or low relative CFE adversity scores. We used sequential multivariable regression models to estimate hazard ratios of incident (CVD) and all-cause mortality. Participants were 25.1+/-3.6 years old, 47% black, and 56% female at baseline and 198 participants developed CVD (17.9 per 10 000 person-years) during follow-up. CVD incidence was \u3e 50% higher for those in the high CFE adversity group compared with those in the low CFE adversity group. In fully adjusted models, CVD hazard ratios (95% CI) for participants who reported high and moderate CFE adversity versus those reporting low CFE adversity were 1.40 (0.98-2.11) and 1.25 (0.89-1.75), respectively. The adjusted hazard ratios for all-cause mortality was 1.68 (1.17-2.41) for those with high CFE adversity scores and 1.55 (1.11-2.17) for those with moderate CFE adversity scores. Conclusions Adverse CFE was associated with CVD incidence and all-cause mortality later in life, even after controlling for CVD risk factors in young adulthood

Thatcherite Ideology, Housing Tenure, and Crime: The Socio-Spatial Consequences of the Right to Buy for Domestic Property Crime

However one views it, the changes to housing tenure in the 1980s were pronounced and have had enduring effects in terms of the housing market. In this paper, we throw light on the relationship between housing tenure and the experience of property crime in and around what might be referred to as domestic environments (i.e. people’s homes). In so doing, we explore the ideological positions which both of the (then) main political parties had adopted towards housing during the 1970s (during the build up to the sale of council housing) and the ways in which the legal framework surrounding housing was modified in order to effect these ideas at, quite literally, ‘street level’. Using the General Household Survey, the British Crime Survey and the British Social Attitudes Survey, we examine the general relationship between housing tenure and crime and explore how these unfolded both in terms of time (i.e. an historical analysis) and social space (i.e. in terms of the socio-spatial location of these crimes)

Impact of D₂O/H₂O solvent exchange on the emission of HgTe and CdTe quantum dots: Polaron and energy transfer effects

We have studied light emission kinetics and analyzed carrier recombination channels in HgTe quantum dots that were initially grown in H2O. When the solvent is replaced by D2O, the nonradiative recombination rate changes highlight the role of the vibrational degrees of freedom in the medium surrounding the dots, including both solvent and ligands. The contributing energy loss mechanisms have been evaluated by developing quantitative models for the nonradiative recombination via (i) polaron states formed by strong coupling of ligand vibration modes to a surface trap state (nonresonant channel) and (ii) resonant energy transfer to vibration modes in the solvent. We conclude that channel (i) is more important than (ii) for HgTe dots in either solution. When some of these modes are removed from the relevant spectral range by the H2O to D2O replacement, the polaron effect becomes weaker and the nonradiative lifetime increases. Comparisons with CdTe quantum dots (QDs) served as a reference where the resonant energy loss (ii) a priori was not a factor, also confirmed by our experiments. The solvent exchange (H2O to D2O), however, is found to slightly increase the overall quantum yield of CdTe samples, probably by increasing the fraction of bright dots in the ensemble. The fundamental study reported here can serve as the foundation for the design and optimization principles of narrow bandgap quantum dots aimed at applications in long wavelength colloidal materials forinfrared light emitting diodes and photodetectors.We acknowledge financial support by the grant from the Research Grants Council of the Hong Kong S.A.R., China (project CityU 11302114). MIV acknowledges financial support from the FCT (Portugal)

Volcanism, redox conditions, and microbialite growth linked with the end-Permian mass extinction: Evidence from the Xiajiacao section (western Hubei Province), South China

© 2017. A new Permian-Triassic boundary microbialite (PTBM) is described from the Xiajiacao section of western Hubei Province, South China. The new microbialite, 3.16. m thick, comprises a thin layer of stromatolite and a thick thrombolite unit. An irregular contact separates the uppermost Permian skeletal packstone from the post-extinction stromatolite, but it is not yet possible to discriminate whether it was formed by submarine solution in the wake of ocean acidification or subaerial exposure due to regional regression, or a combination of both. The stromatolite shows "cabbage-like" morphology, and the thrombolite is characterized by centimetric clotted texture. Abundant columns of the microproblematica structure Gakhumella, coccoid-like spheroids, bacterial clump-like spheroids, and hollow spheroids are recognized in both stromatolites and thrombolites and may have played an important role in accretion of the microbialites. Pyrite framboid analysis indicates that microbialites may have been affected by lower dysoxic to upper dysoxic conditions in the immediate aftermath of the Permian-Triassic extinction. Stratigraphic abundance of both high-temperature grains (β-quartz and glassy balls) peaked ~. 20. cm below the biotic extinction horizon, implying that either intensive volcanic eruption occurred only just prior to biotic extinction, or volcanism was still intensive during biotic extinction, but volcanic grains were not deposited in the Xiajiacao locality, likely due to the shallow, agitated environment caused by the regional regression. Overall, microbial bloom, indicated by the widespread PTBMs, seems to have been little affected by the contemporaneous volcanism.We thank both anonymous reviewers and editor Thomas Algeo for critical comments and constructive suggestions, which have greatly improved the quality of the paper. This study is partly supported by the 111 Program of China (B08030), two NSFC grants (41572091, 41402089), and one research grant from the State Key Laboratory of Biogeology and Environmental Geology (BGEG), China University of Geosciences (GBL11206). It is a contribution to the IGCP 630 “Permian–Triassic climatic and environmental extremes and biotic response”