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In this paper, we examine the exchange of crops and livestock through the application of strontium (87Sr/86Sr) isotope analysis on cereal grains and faunal tooth enamel from the regional center of Uppåkra and three nearby settlements in Scania, southern Sweden, dating to the first millennium AD. Around a third of the fauna have non-local 87Sr/86Sr values, indicating the import of livestock from several different regions. After cleaning, almost all of the cereal grains have non-local 87Sr/86Sr values, which is surprising given the nearby abundance of fertile agricultural soils. We therefore suggest considering non-locally grown crops to be those whose 87Sr/86Sr values fall outside the normal distribution; if this approach is used, around 20% of the analyzed crop samples are interpreted as having grown non-locally. This study demonstrates the potential of combining strontium isotopic data of archaeobotanical and zooarchaeological material for gaining insights into the movement of agricultural products in prehistory. [ABSTRACT FROM AUTHOR]

This study uses crop stable nitrogen isotope analysis of charred grain to explore manuring practices in arable production at the affluent regional center Uppåkra and a set of smaller surrounding sites, dating to the first millennium AD in southern Sweden. The isotopic analysis focuses on hulled barley, the principle crop in the Scandinavian Iron Age, and the minor crops: bread wheat, emmer wheat, rye and oat, are included to compare manuring practices in cultivation of other crop species during this period. A field experiment was first conducted to establish relationships between manuring and δ15N values in modern grain from known growing conditions. The data formed an interpretive framework to reconstruct past agricultural practices and manuring intensity in the archaeological study area. Our results from the ancient grains have demonstrated that barley from the early phase in the study area (AD 0–200) varies widely in its δ15N values, reflecting mixed manuring regimes. In the following periods (AD 200–1000), isotopic values are relatively high overall, indicating systematic input of manure. In this paper, we explore whether the isotopic data that indicates sustained and high manuring levels could reflect the wealth of Uppåkra and its surrounding areas by showing prosperity also in its agricultural production, since intensive manuring would have required more resource and labor investments. The new crop nitrogen isotopic data shed light on the agricultural practices of a long-lived Iron Age center and its surrounding areas. [ABSTRACT FROM AUTHOR]

Measurements of archaeological cereal grains has the potential to improve interpretations of archaeobotanical assemblages and to address a broad range of research questions related to agricultural practices in the past. However, understanding the role of the many factors that can influence the morphometrics of cereal grains is of importance to validate the application of morphometrics in archaeobotany. The aim of this study was to investigate the potential effects of growing conditions on cereal grain size using three experimental factors: site-location with different soil types, manure intensity and plant density. A short-term field experiment was conducted at two locations (Alnarp and Holma) in southern Sweden with hulled barley, naked barley, bread wheat, emmer wheat, einkorn, spelt wheat, rye and oat. Our results show that, while all three factors investigated affect grain size, most significant effect was from manuring (p < 0.0001) and site location with different soil types (p < 0.0001), plant density had the weakest effect (p = 0.005), and that cereal species reacted differently to experimental factors. We further use the morphometric dataset to assess the relationship between grain size variation and growing conditions, using the sample range of grain size from different experimental factors. The experimental data obtained sheds light on how growing conditions may affect grain size and the results are discussed in relation to grain size composition in archaeobotanical assemblages. • Experimental study show the effect of growing conditions on cereal grain size. • Manuring and site-location had a stronger influence on grain size compared to plant density. • Wide variation in grain size was observed within and between investigated growing conditions. • Observed sample ranges of grain sizes helps to better interpret archaeobotanical assemblages. [ABSTRACT FROM AUTHOR]

Subfossil remains of Cannabis sativa L. (hemp) have been found at Lindängelund in the region of Malmö, southern Sweden. These represent the earliest robust evidence so far for hemp retting in Scandinavia. Finds of seeds, stems and pollen of C. sativa from a waterlogged context on a settlement dating to the Roman Iron Age demonstrate that the plant was locally cultivated and processed during the 1st-2nd centuries AD. An introductory phase in Scandinavia is proposed (c. AD 1-400) during which the cultivation of hemp was apparently small scale and processing was probably carried out within settlements. In the succeeding centuries, c. AD 400-550 (the Migration Period), remains of hemp are mostly found in pollen records from lake sediments, and less frequently in the archaeological record. This could indicate that the process of hemp retting relocated from settlements to lakes shores where activity became larger in scale and more integrated with the prevailing agricultural system. [ABSTRACT FROM AUTHOR]

Increased demand response is essential in order to boost the effectiveness of the Swedish power market. The all-embracing installation of automatic meter reading systems enables power suppliers to introduce hourly settlements in the residential sector. The aim of the study has been to assess the impact of electricity retailers' physical and financial risk in customer segments with different heating systems as well as to estimate the potential of the electricity contract “Fixed price with the right to return” in terms of economic consequences and risk management. To that end, computer simulations using empirical data have been employed. The results show that the physical price and volume risk, which constitute the greatest risk of suppliers, are most severe in households whose main heating system consists of a geothermal heat pump and less serious in households that are less dependent on electricity for heating. Hourly settlements in the residential electricity market have proven to be advantageous to retailers from both an economic and risk reducing point of view and provide a superior opportunity for customers, and those with an electric heating installation in particular, to lower their electricity expenses substantially. [ABSTRACT FROM AUTHOR]

We have investigated and modeled the injection of biomass into blast furnaces (BF), in place of pulverized coal (PC) from fossil sources. This is the easiest way to reduce CO 2 emissions, beyond efficiency-improvements. The considered biomass is either pelletized, torrefied or pyrolyzed. It gives us three cases where we have calculated the maximum replacement ratio for each. It was found that charcoal from pyrolysis can fully replace PC, while torrefied material and pelletized wood can replace 22.8% and 20.0% respectively, by weight. Our energy and mass balance model (MASMOD), with metallurgical sub-models for each zone, further indicates that (1) more Blast Furnace Gas (BFG) will be generated resulting in reduced fuel consumption in an integrated plant, (2) lower need of limestone can be expected, (3) lower amount of generated slag as well, and (4) reduced fuel consumption for heating the hot blast is anticipated. Overall, substantial energy savings are possible, which is one of the main findings in this paper. Due to the high usage of PC in Sweden, large amounts of biomass is required if full substitution by charcoal is pursued (6.19 TWh/y). But according to our study, it is likely available in the long term for the blast furnace designated M3 (located in Luleå). Finally, over a year with almost fully used production capacity (2008 used as reference), a 28.1% reduction in on-site emissions is possible by using charcoal. Torrefied material and wood pellets can reduce the emissions by 6.4% and 5.7% respectively. The complete replacement of PC in BF M3 can reduce 17.3% of the total emissions from the Swedish steel industry. [ABSTRACT FROM AUTHOR]

Abstract: LKAB Malmberget is a Swedish mining site located at Malmberget, Sweden. Seven boiler centers are located in the north part of Malmberget. There are no connections in between these boiler centers, meaning that it is a decentralized heating system. The heat generated is used to heat up buildings and for mine ventilation air mainly during the cold periods. The heat is mainly provided from electric and oil boilers. However, most boilers under use are over 20 years old, and it is time to retrofit the boiler system and infrastructure. The purpose of this work is to design and optimize the heating system by introducing an integrated concept to minimize the heat production cost. An optimization model based on the mixed integer linear programming (MILP) has been developed. Several technical options have been considered in a new centralized heating system. The optimization principle is based on two kinds of perspectives: current price and external costs. With consideration of environmental and health damage from society concerns point of view, instead of environmental taxes in the current price perspective, the monetary values of externalities due to pollutants such as CO2, NO x , SO2 and particulates emitted from the heating system are included. On the basis of data input and assumptions, modeling results indicate that a lower cost could be achieved when a waste heat recovery boiler is installed at the older pelletization plant to recover sensible heat from flue gas. This technical option is the best solution or at least contributes to the best solution in all optimization results. Including the externality cost is useful for making fair evaluation of the social-environmental impacts of the alternatives. [Copyright &y& Elsevier]

Maritime archaeological investigations of the wreck of the medieval warship Gribshunden (1495), flagship of King Hans of Denmark and Norway, have revealed diverse artifacts including exotic spices imported from far distant origins: saffron, ginger, clove, peppercorns, and almond. The special circumstances of the vessel's last voyage add unique context to the assemblage. Gribshunden and an accompanying squadron conveyed the king, courtiers, noblemen, and soldiers from Copenhagen to a political summit in Kalmar, Sweden. At that conference, Hans expected the Swedish Council to elect him king of Sweden, and thereby fulfill his ambition to reunify the Nordic region under a single crown. To achieve this, Hans assembled in his fleet and particularly aboard his flagship the people and elite cultural signifiers that would convince the Swedish delegation to accept his rule. Along the way, the ships anchored near Ronneby, Blekinge. Written sources record that an explosion and fire caused Gribshunden to sink off Stora Ekön (Great Oak Island). Exotic spices were status markers among the aristocracy in Scandinavia and around the Baltic Sea during the Middle Ages (1050-1550 CE). Until the Gribshunden finds, these extravagances have rarely or never been represented archaeologically. Evidence of their use and consumption in medieval Scandinavia has been limited to sparse written references. We present here the botanical remains from the Gribshunden shipwreck and compare them to previous archaeobotanical finds from the medieval Baltic region. These opulent status symbols traveled with a medieval king en route to a major historical event. The combination of textual and archaeological evidence allows a novel analytical view of the social environment in which these luxurious foods were consumed., Competing Interests: The authors have declared that no competing interests exist., (Copyright: © 2023 Larsson, Foley. This is an open access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.)