A Novel and Sustainable Generation of Advanced Mud Gas Logging System for Managed Pressure Drilling Applications: An Explorative Well Deployment from North Germany

Summary In the high risk Managed Pressure Drilling operations, increased certainty given by Mud Logging is a critical deliverable to guarantee a safe drilling environment even under challenging conditions and, to provide the first indications for reservoir evaluation. This paper describes a novel product application that successfully obtains advanced mud gas data from a Managed Pressure Drilling environment, proven in flow-loop and field applications (in Lower Saxony, Germany), by reducing service footprint as well as power consumption.

Międzynarodowy kontekst odzyskania ziemi sławieńskiej przez Mściwoja II w 1283 r. i zawarcia sojuszu brandenbursko­­­‑wielkopolskiego

Taking advantage of the war between the Margraves of Brandenburg and representatives of the federation of Rostock (1283–1284), in the spring­­­‑summer of 1283, Mściwój II, in collusion with Duke Przemysł II of Greater Poland, took the lands around Sławno from the Margraves of Brandenburg. Before the end of 1283, the Brandenburg House of Ascania/Anhalt, being embroiled in in a war in north Germany and in Pomerania, could not respond militarily. In December 1283, Ludgarda of Mecklenburg, the wife of Przemysł II, died in mysterious circumstances. Since just before her death the Duke turned from his policy up to then and entered into an alliance with his previous enemies the Margraves of Brandenburg (fighting in 1283–1284 with, among others, the mother, brothers, and other relatives of his dead wife), it appears that the matter of Ludgarda’s death and Przemysł political turn­­­‑about are linked. In initial peace negotiations in Vierraden (13 August 1284), Przemysł II was counted among the supporters of the Margraves of Brandenburg. Despite an agreement that was supposed to bring an end to the war with Pomerania and Rugia/Rügen and with the other members of the federation of Rostock (including the lords of Sławno and relatives of Ludgarda), the Duke was in need of a marriage­­­‑alliance that would strengthen his position in relation to the abandoned Pomeranian­­­‑Mecklenburg affiliation. It was to the Brandenburg Margraves’ Scandinavian contacts (important in the context of further relations of the House of Ascania/Anhalt with the trading cities of Połabie and Pomerania) that Przemysł II thanked the opportunity to balance the political influence of Ludgarda’s relatives and to enter into a marriage with Ryska, the daughter of Waldemar Birgersson and the ward of Magnus Birgersson Ladulås. This union also strengthened the Scandinavian influence of the Margraves. The Greater Poland-Brandenburg alliance determined the fact that for at least some time the House of Ascania/Anhalt gave up any attempt to recover the lands around Sławno.

A Method for Assessing Regional Bioenergy Potentials Based on GIS Data and a Dynamic Yield Simulation Model

The assessment of regional bioenergy potentials from different types of natural land cover is an integral part of simulation tools that aim to assess local renewable energy systems. This work introduces a new workflow, which evaluates regional bioenergy potentials and its impact on water demand based on geographical information system (GIS)-based land use data, satellite maps on local crop types and soil types, and conversion factors from biomass to bioenergy. The actual annual biomass yield of crops is assessed through an automated process considering the factors of local climate, crop type, soil, and irrigation. The crop biomass yields are validated with historic statistical data, with deviation less than 7% in most cases. Additionally, the resulting bioenergy potentials yield between 10.7 and 12.0 GWh/ha compared with 13.3 GWh/ha from other studies. The potential contribution from bioenergy on the energy demand were investigated in the two case studies, representing the agricultural-dominant rural area in North Germany and suburban region in South Germany: Simulation of the future bioenergy potential for 2050 shows only smaller effects from climate change (less than 4%) and irrigation (below 3%), but the potential to cover up to 21% of the transport fuels demand in scenario supporting biodiesel and bioethanol for transportation.

Jointness and the Norwegian Campaign, 1940

The Norwegian campaign of 1940 was the first major confrontation between Germany and the Allies in World War II. Although both sides had been poised along the Western Front since September 1939, serious fighting did not break out there; instead, the belligerents first fought in the far north. Germany had sound strategic reasons for conquering Norway, but the Allies attacked them there simply because they did not wish to fight in France. Important lessons were learned in Norway, by both sides, regarding joint operations, unity of command, and airpower –specifically, the need for air superiority over naval forces.

Low-Input Estimation of Site-Specific Lime Demand Based on Apparent Soil Electrical Conductivity and In Situ Determined Topsoil pH

Site-specific liming helps increase efficiency in agricultural production. For adequate determination of the lime demand, a combination of apparent soil electrical conductivity (ECa) and topsoil pH can be used. Here, it was hypothesized that this can also be done at low-input level. Field measurements using the EM38 MK I (Geonics, Canada) were conducted on three experimental sites in north Germany in 2011. The topsoil pH was measured based on two approaches: on the field using a handheld pH meter (Spectrum-Technologies Ltd., Bridgend, UK) with a flat electrode (in situ), and in the lab using standard equipment (ex situ). Both soil ECa (0.4–35.9 mS m−1) and pH (5.13–7.41) were heterogeneously distributed across the sites. The same was true of the lime demand (−1.35–4.18 Mg ha−1). There was a significant correlation between in situ and ex situ determined topsoil pH (r = 0.89; p < 0.0001). This correlation was further improved through non-linear regression (r = 0.92; p < 0.0001). Thus, in situ topsoil pH was found suitable for map-overlay with ECa to determine the site-specific lime demand. Consequently, the hypothesis could be confirmed: The combined use of data from EM38 and handheld pH meters is a promising low-input approach that may help implement site-specific liming in developing countries.

Helmolds von Bosaupons longissimus. Archaologische Unterwasserausgrabungen bei den Briickenanlagen neben der slawischen und frühdeutschen Burg Olsborg im Grossen Ploner See (Norddeutschland)

The article is aimed at presentation of results of archaeological underwater excavations of remains of the early Medieval bridge on the stronghold island Oslborg. There are vestiges of the Slavic and early German stronghold on the Grosser Plòner Lake island near Plon in north Germany. This stronghold has been repeatedly mentioned by Adam of Bremen and Helmold of Bosau - the 11th and 12th century annalists. Underwater excavations, undertaken in two study zones of 75 square meters in total, resulted in discovery of the bridge remains which revealed themselves in the form of 228 posts being elements of its bearing construction placed on the lake bottom. Dendrochronological analysis of 79 posts indicates that the bridge was constructed in 975 AD and it was rebuilt many times afterwards. Trees for subsequent reconstructions were cut down in the years 994, 995, 1005, 1008, 1011, 1012, 1013, 1025 and for the last time in 1096 AD. The excavations revealed also an assemblage of Slavic and early German pottery as well as 56 artefacts including 14 spearheads and 6 axes. These military accessories can possibly be linked with the 1075, 1128 or 1139 war, mentioned by Helmold of Bosau.Bleile R. 1999 Vorbericht zu unterwasserarchàologischen Untersuchungen an einer Slawischen Briickenanlage im PlauerSee bei Quetzin, Landkreis Parchim (Mecklenburg-Vorpommern), „Nachrichtenblatt Arbeitskreis Unterwasserarchaologie” Bd. 5, S. 32-35.Bleile R. 2003 Briicken unter Wasser. Neue Ergebnisse zu slawischen Briicken und Bohlenwegen in Mecklenburg-Vorpommern, „Mitteilungen der Deutschen Gesellschaft fur Archàologie des Mittelalters und der Neuzeit” 14, S. 80-84.Freytag H.J. 1985 Die Lage der slawischen und friihen deutschen Burg Plon, „Zeitschrift der Gesellschaft für Schleswig-holsteinische Geschichte” Bd. 10, S. 27-52.Hucke K. 1952 Wo lag die wendische Burg Plune?, „Die Heimat” Bd. 59, S. 136—139.Kempke T. 1992 Slawen in Ostholstein. Ausgrabungen in Bosau am Ploner See, (in:) Der Vergangenheit auf der Spur. Archàologische Siedlungsforschung in Schleswig-Holstein, Hrsg. M. Miiller-Wille und D. Hoffmann, S. 141-162.Kempke T. 1998 Archàologische Beitràge zur Grenze zwischen Sachsen und Slawen im 8.-9. Jahrhundert, (in:) Studien zur Archàologie des Ostsseeraumes. Von der Eisenzeit zum Mittelalter (Festschrift Michael Miiller-Wille), Hrsg. A. Wesse, Neumiinster, S. 373-382.Mittelstàdt U. 1976 Die Entwicklung der Stadi Plon bis zum Ausgang des Mittelalters, „Jahrbuch tur Heimatkunde im Kreis Plòn-Holstein” Jg. 7, S. 5-34.Kiefmann H.M. 1978 Historisch-geographische Untersuchungen zur alteren Kulturlandschafts-entwicklung, (in:) Bosau. Untersuchung einer Siedlungskammer in Ostholstein unter Leitung von Hermann Hinz, „Offa-Biicher” Bd. 38.Kola A., Wilke G. 2000 Briicken vor 1000 Jahren. Unterwasserarchaologie bei der polnischen Herrscherpfalz Ostrów Lednicki, Toruń.Krambeck H.J. 1979 A numercial-topographical model of Lake Grofier Plòner See and its application to the calculation of Seiches, „Archiv Hydrobiological” Bd. 87-3, S. 262-273.Wilke G. 1985 Most wczesnośredniowieczny z Bobęcina kolo Miastka. Wstępne wyniki archeologicznych badań podwodnych i analiz dendrochronologicznych jego reliktów [Sum.: The early mediewal ages bridge of Bobącin near Miastko. Preliminary results of archaeological underwater investigations and dendrochronological analyses of its remains], „Acta Universitatis Nicolai Copernici”, Archeologia 11, Archeologia Podwodna 2, S. 3-26.Wilke G. 1995 Lokalizacja stanowisk archeologicznych pod lustrem wody na przykładzie Jeziora Płońskiego Wielkiego (Grosser Ploner See) w północno-zachodnich Niemczech [Sum.: Location of archaeological sites under water - level on the example of Płońskie Wielkie Lake (Grosser Ploner See) in North Germany], (in:) Archeologia podwodna jezior Niżu Polskiego, Hrsg. A. Kola, Toruń, S. 71-90.Wilke G. 1998 Archàologie unter Wasser. Untersuchungen der slawischen Briicken in Lednica-See bei der Insel Ostrów Lednicki (Polen), (in:) Studien zur Archàologie des Ostseeraumes. Von der Eisenzeit zum Mittelalter (Festschrift Michael Müller-Wille), Hrsg. A. Wesse, Neumünster, S. 195-203.Wilke G. 2000a Analiza chronologiczno-przestrzenna struktur palowych i próba rekonstrukcji mostu [Sum.: Chronological - spatial analysis of pile structures and an attempt of bridge reconstruction], (in:) Wczesnośredniowieczne mosty przy Ostrowie Lednickim, t. 1 : Mosty traktu gnieźnieńskiego, Hrsg. Z. Kurnatowska, Lednica-Toruń, S. 57-71.Wilke G. 2000b Briicken und Brückenbau im óstlichen Mitteleuropa um 1000, (in:) Europas Mitte um 1000. Beitrage zur Geschichte, Kunst und Archàologie, Hrsg. A. Wieczorek, H.M. Hinz, Handbuch zur Ausstellung, Stuttgart, S. 142-145.

Farm Water Productivity in Conventional and Organic Farming: Case Studies of Cow-Calf Farming Systems in North Germany

The increase of organic agriculture in Germany raises the question of how water productivity differs from conventional agriculture. On three organic and two conventionally farming systems in Germany, water flows and water related indicators were quantified. Farm water productivity (FWP), farm water productivity of cow-calf production (FWPlivestock), and farm water productivity of food crop production (FWPfood crops) were calculated using the modeling software AgroHyd Farmmodel. The FWP was calculated on a mass and monetary basis. FWPlivestock showed the highest productivity on a mass basis occurring on a conventional farm with 0.09 kg m−3Winput, whereas one organic farm and one conventional farm showed the same results. On a monetary basis, organic cow-calf farming systems showed the highest FWPlivestock, with 0.28 € m−3Winput. Since the productivity of the farm depends strongly on the individual cultivated plants, FWPfood crops was compared at the level of the single crop. The results show furthermore that even with a precise examination of farm water productivity, a high bandwidth of temporal and local values are revealed on different farms: generic FWP for food crops and livestock are not within reach.