Ice Sheet Dynamics of the Past 17 Myr in Southern McMurdo Sound, Antarctica: A Heavy Mineral Analysis

The ANtarctic Geologie DRILLing program (ANDRILL) drilled a sediment core from a sea ice platform in the Ross Sea in southern McMurdo Sound (SMS), Antarctica, in late 2007. The core site is located just to the east of the Transantarctic Mountains (TAM) along the western margin of a half graben and is a site of heavy sedimentation from the TAM, the East Antarctic Ice Sheet (EAIS), the McMurdo Volcanic Group (MVG), and the West Antarctic Ice Sheet (WAIS) and Ross Ice Shelf. The upper 650 m of the core were analyzed for heavy minerals in order to interpret ice sheet drainage patterns and dynamics of the past 17 Myr. Grain mounts of the fíne sand sized (63-250 pm) heavy mineral fraction of 23 intervals were created and approximately 300 grains were identified per slide. The data represents a major change in sediment provenance and indicates the Middle Miocene Climate Transition (MMCT), which was a cooling period 13.8-14.2 Ma. The period before the MMCT is represented by a invariant assemblage of heavy minerals in the interval 300 - 650 mbsf (15-17 Ma), especially static 350 - 550 mbsf, with a provenance of the Koettlitz and Ferrar Glaciers. This suggests a distal ice sheet relative to the SMS core site that is not providing any influence. Between 240 and 300 (13.8 - 15 Ma) mbsf, a change in provenance from local TAM to MVG and southern TAM occurred and mineral assemblages representing these source rocks are more abundant in the upper 240 m. This suggests a cooler environment in which the WAIS is expanding and forces transport and deposition of sediment by the EAIS from further south. This correlates well with clast provenance, wholerock geochemical data, and stratigraphic interpretations performed by other SMS team members

Aircraft noise distribution as a fairness dilemma—A review of aircraft noise through the lens of social justice research

Aircraft noise exposure is a health risk and there is evidence that noise annoyance partly mediates the association between noise exposure and stress-related health risks. Thus, approaches to reduce annoyance may be beneficial for health. Annoyance is influenced by manifold non-acoustic factors and perceiving a fair and trustful relationship between the airport and its residents may be one of them. The distribution of aircraft noise exposure can be regarded as a fairness dilemma: while residents living near an airport may seem to have some advantages, the majority of residents living under certain flight routes or in their immediate proximity suffer from the disadvantages of the airport, especially the noise. Moreover, a dilemma exists between the airport’s beneficial economic impact for a region and the physical and psychological integrity of residents. Aircraft noise exposure through the lens of social justice research can help to improve our understanding of noise annoyance. Research indicates that the fairness perceptions of the parties involved can be enhanced by (a) improving individual cost–benefit ratios, (b) providing a fair procedure for deciding upon the noise distribution, and (c) implementing fair social interaction with residents. Based on the review of evidence from social justice research, we derive recommendations on how fairness aspects can be integrated into aircraft noise management with the purpose of improving the relationship between the airport and its residents, to reduce annoyance, and to enhance the acceptance of local aviation and the airport as a neighbor

The State of the Oligocene Icehouse World: Sedimentology, Provenance, and Stable Isotopes of Marine Sediments from the Antarctic Continental Margin

The Oligocene Epoch (34-23 Ma) was a dynamic time in Antarctica, with previous ice volume estimates suggesting fluctuations from below 50 % up to 140 % of modern all while atmospheric CO2 decreased from above 1,000 ppm in the Early Oligocene to near modern levels by the Late Oligocene. Most of what is known about the Oligocene Antarctic cryosphere however, is derived from distal sedimentary records that can only provide a generalized view of the cryospheric dynamics in Antarctica. To better understand regional differences in Antarctic glacial dynamics, proximal records are needed. This dissertation advances our understanding of these dynamics in Antarctica during the Oligocene by investigating three proximal, marine sediment cores from different regions of the continent. Ice-rafted debris (IRD) concentrations, 40Ar/39Ar thermochronology, and stable isotope records combined from 3 proximal marine sediment cores reveal a large ice sheet existed throughout the Oligocene, with ice volume reaching up to 155 % of modern. Concentrations and 40Ar/39Ar thermochronology from IRD offshore of the Wilkes subglacial basin suggest the ice sheet was fairly stable on elevated portions such as the Adélie Craton, but the basin itself was more responsive to climate changes. These changes appear to be influenced by 405-kyr eccentricity and 1.2 myr obliquity. In the Ross Sea, 40Ar/39Ar thermochronology from IRD show a large West Antarctic influence, indicative of a large ice sheet residing there during the Late Oligocene. Stable isotopes from benthic foraminifera from the Maud Rise show ice volume fluctuations from below 50 % up to 155 % of modern, in agreement with modeling and far-field records. The isotope record is also influenced by 405-kyr and 100-kry eccentricity and does not show a warming trend during the Late Oligocene as seen in other isotope records. Together, these records are indicative of a near-modern size or larger ice sheet present in both East and West Antarctica during the Oligocene, a time when the extent of Antarctica glaciation has been debated

Synthese und Charakterisierung neuer metall-organischer Gerüststrukturen zur Anwendung in der enantioselektiven Katalyse und Gasspeicherung: Synthese und Charakterisierung neuer metall-organischer Gerüststrukturen zur Anwendung in der enantioselektiven Katalyse und Gasspeicherung

Zielstellung der durchgeführten Arbeiten war die Entwicklung neuer hochporöser metall-organischer Gerüststrukturen (engl.: metal-organic frameworks, MOFs) durch die Verwendung aufgeweiteter Linkermoleküle. Hierfür wurden verschiedene Synthesestrategien verfolgt. Zum einen wurde die Ausbildung von Layer-Pillar-Strukturen auf der Basis von Anthracen-Linkern genutzt, um poröse und sehr stabile metall-organische Gerüstverbindungen darzustellen. Außerdem wurden aufgeweitete trigonale Linkermoleküle bzw. eine Kombination von bi- und tridentaten Liganden verwendet, um hochporöse Koordinationspolymere zu synthetisieren. Zudem wurde die Synthese chiraler poröser Koordinationspolymere durch die Nutzung des modifizierten TADDOL-Katalysators als chirale organische Komponente verfolgt, um somit einen heterogenen Katalysator für die enantioselektive Katalyse zu gewinnen. Im Rahmen der vorliegenden Arbeit konnten die verschiedenen Synthesestrategien erfolgreich angewendet werden. Durch die Umsetzung des bidentaten Linkers 4,4´-Anthracen-9,10-diyldibenzoesäure und dem Säulenliganden 1,4-Diazabicyclo[2.2.2]octan (Dabco) mit verschiedenen Metallsalzen konnte eine neue Reihe isotyper, poröser Layer-Pillar-Verbindungen (DUT-30, DUT = Dresden University of Technology) mit einer sehr guten Stabilität gegenüber Luft und Feuchtigkeit dargestellt werden. Die Strukturen zeigen eine äußerst hohe Flexibilität, sodass sieben verschiedene Phasen der Verbindungen gefunden werden konnten. Dadurch sind diese Materialien prädestiniert zur Entfernung von Schadstoffen, wie z.B. organischen Lösungsmitteldämpfen, aus der Luft. Auch die Verwendung von trigonalen Linkern kann zur Synthese hochporöse Koordinationspolymere genutzt werden. Dies wurde anhand des Linkers 1,3,5-Tri-(4´-carboxy(1,1´-biphenyl)-4-yl)benzen erprobt. Die Umsetzung des Linkers mit Zinknitrat bzw. Cobaltnitrat führte zu den hexagonalen Schichtstrukturen DUT-40 und DUT-44. DUT-43 besteht ebenfalls aus einer derartigen hexagonalen Schichtstruktur, wobei hier jedoch die Verwendung von 4,4´-Biphenyldicarbonsäure als Co-Linker eine teilweise Verknüpfung der Schichten ermöglicht. Außerdem konnte durch die Umsetzung des tridentaten Linkers mit Kupfernitrat die Struktur von DUT-54 gebildet werden. In dieser liegen eindimensionale Stränge vor, wobei es zu einer gegenseitigen Durchdringung kommt und damit eine dreidimensionale Kanalstruktur entsteht. Eine weitere Synthesestrategie zur Erzeugung hochporöser Materialien nutzt die Verwendung von Co-Linkern für die Erzeugung der Koordinationspolymere. Hier war in der Vergangenheit vor allem die Kombination von bi- und tridentaten Linkern erfolgreich. Nutzt man als bidentaten Vertreter 9,10-Anthracendicarbonsäure, so eignet sich 4,4´,4´´-Benzen-1,3,5-triyltribenzoesäure als tridentater Co-Linker. Die solvothermale Umsetzung der beiden Linker in verschiedenen Lösungsmittelgemischen führte zu zwei neuen porösen Kooordinationspolymeren, welche beide Linkerarten enthalten. Um jedoch gezielt ein hochporöses und stabiles Material erzeugen zu können wurde eine Struktur simuliert, welche isoretikulär zu der bekannten Struktur DUT-6 ist, welche ebenfalls nach dem Prinzip der Kombination von bi- und tridentaten Liganden dargestellt wurde. Die zu erzeugende Struktur beruht auf dem tridentaten Linker 1,3,5-Tri-(4´-carboxy-(1,1´-biphenyl)-4-yl)-benzen und dem bidentaten Linker 1,4-Bi-p-carboxyphenylbuta-1,3-dien, welcher exakt die richtige Länge aufweist, um in diese Struktur eingebaut zu werden. Die Umsetzung von basischem Zinkacetat mit einem Gemisch der beiden Linker führte zu der zuvor simulierten Struktur. Für diese Verbindung, DUT-60, konnte eine spezifische Oberfläche von 6500 m2g-1 und ein Porenvolumen von 3.5 cm3g-1 berechnet werden, welche zu den höchsten jemals für poröse Koordinationspolymere ermittelten Werte gezählt werden können. Ein weiterer Bereich der vorliegenden Arbeit galt der Entwicklung eines neuen chiralen und porösen Koordinationspolymers, welches in der heterogenen enantioselektiven Katalyse eingesetzt werden kann. Dafür wurde der aus der homogenen Katalyse bekannte TADDOL-Linker modifiziert. Durch die solvothermale Umsetzung dieses Linkers mit Zinknitrat konnte die Verbindung DUT-39 erhalten werden. Diese zeigt hervorragende Werte bezüglich ihres Adsorptionsverhaltens für verschiedene Gase und zählt somit zu den chiralen, metall-organischen Gerüstverbindungen mit den höchsten Porositäten. Außerdem zeigt die Verbindung eine hohe thermische Stabilität sowie eine gute Stabilität gegenüber Luftfeuchte, was sie zu einem attraktiven Kandidaten für die heterogene enantioselektive Katalyse macht

Microstructural Evolution During Hot Rolling of an AZ31 Mg Alloy

The microstructural evolution of a AZ31 Mg alloy during hot rolling has been investigated using optical microscopy and texture (macro and micro) analysis as the main characterization tools. In particular, the differences between the microstructure obtained by unidirectional rolling (UR) and cross rolling (CR) are studied. Significant twinning activity is observed in both cases. Additionally, after cross rolling, a rather heterogeneous microstructure develops, with scattered regions populated by very fine grains. The strong basal fiber texture of the as-received material remains present after both hot rolling schemes. The imposibility to obtain accurate EBSD measurements within the twinned regions suggests that significant localized deformation takes place in those areas. Thus, due to the increase in the local strain energy, these regions become preferential sites for nucleation of recrystallization.Peer reviewe

A family of 2D and 3D coordination polymers involving a trigonal tritopic linker

Five new coordination polymers, namely, [Zn2(H2O)2(BBC)](NO3)(DEF)6 (DUT-40), [Zn3(H2O)3(BBC)2] (DUT-41), [(C2H5)2NH2][Zn2(BBC)(TDC)](DEF)6(H2O)7 (DUT-42), [Zn10(BBC)5(BPDC)2(H2O)10](NO3)(DEF)28(H2O)8 (DUT-43), and [Co2(BBC)(NO3)(DEF)2(H2O)](DEF)6(H2O) (DUT-44), where BBC – 4,4′,4′′-(benzene-1,3,5-triyl-tris(benzene-4,1-diyl))tribenzoate, TDC – 2,5-thiophenedicarboxylate, BPDC – 4,4′-biphenyldicarboxylate, DEF – N,N-diethylformamide, were obtained under solvothermal conditions and structurally characterized. It has been shown that compounds DUT-40, DUT-41 and DUT-44 exhibit 2D layered structures with large hexagonal channels. Utilization of additional angular dicarboxylic TDC linker led to the formation of the DUT-42 compound with the structure consisting of three interpenetrated 3D networks. Using the linear co-linker dicarboxylic BPDC, DUT-43 was obtained which forms a complicated 3D architecture arising from the polycatenation of triple-layered 2D building units and 2D single layer units. The pore accessibility of the synthesized compounds in the liquid phase was proved by the adsorption of dye molecules.Dieser Beitrag ist mit Zustimmung des Rechteinhabers aufgrund einer (DFG-geförderten) Allianz- bzw. Nationallizenz frei zugänglich

Zanemarene gajene mahunarke Srbije - bob (Vicia faba)

Faba bean is cultivated locally in Serbia with no available official data. The collection at Institute of Field and Vegetable Crops in Novi Sad contains 141 accessions of food and feed faba bean. Forage yields in faba bean may surpass 40 t ha-1 of green forage and 8 t ha-1 of forage dry matter, while grain yields are often higher than 5 t ha-1. Faba bean may produce more than 1,500 kg ha-1 of forage crude protein and about 2,000 kg ha-1 of grain crude protein, as well as more than 250 kg ha-1 of above-ground biomass nitrogen. The first Serbian feed faba bean breeding programme, carried out at Institute of Field and Vegetable Crops in Novi Sad, resulted in registration of two cultivars in 2007, Gema and Šarac, with more than 4,500 kg ha-1 of grain and more than 45 t ha-1 of green forage.Bob se u Srbiji gaji lokalno i bez zvaničnih podataka. Zbirka Instituta za ratarstvo i povrtarstvo u Novom Sadu sadrži 141 akcesiju povrtarskog i stočnog boba. Prinosi krme boba mogu da premaše 40 t ha-1 zelene krme i 8 t ha-1 suve materije krme, dok su prinosi zrna često veći od 5 t ha-1. Bob može da proizvede više od 1.500 kg ha-1 sirovih proteina krme i oko 2.000 kg ha-1 sirovih proteina zrna, kao i više od 250 kg ha-1 azota nadzemne biomase. U okviru prvog srpskog programa oplemenjivanja boba, koji se odvija u Institutu za ratarstvo i povrtarstvo u Novom Sadu, tokom 2007. stvorene su i priznate dve sorte, Gema i Šarac, sa prinosima od više od 4.500 kg ha-1 zrna i više od 45 t ha-1 zelene krme

Engaging communities in the hard quest for consensus

Mistrust, negative attitudes and the expectation of not having any voice against airport authorities can considerably impact on the perception of aircraft noise exposure, lead to increased annoyance and can even influence sleep quality of the noise affected residents. As a result, quality of life can reasonably be assumed to be reduced. This chapter focuses on measures to engage airport communities in aviation-related decision making by improving the information and communication of airports in order to enhance residents’ ‘competence’ and also trust in the airport noise authorities. The role of non-acoustical factors, including aviation-related media coverage in this process, is discussed and results from a media coverage analysis conducted in the ANIMA project are presented. Based on research on perceived fairness in communication, recommendations are given as to how to communicate and engage residents with the aim of building a neighbourly relationship between airport authorities and residents on an even footing and, thus, enable an improved exchange leading to deeper understanding and comprehension by both parties. Results from the ANIMA review on airport management strategies (including communication and engagement aspects) of several European airports are presented and conclusions are drawn about what characterises good (or bad) communication and community engagement strategies for the purpose of a neighbourly relationship between the airport and its residents

Coping with Aviation Noise: Non-Acoustic Factors Influencing Annoyance and Sleep Disturbance from Noise

Annoyance and sleep disturbances due to aircraft noise represent a major burden of disease. They are considered as health effects as well as part of the causal pathway from exposure to long-term effects such as cardiovascular and metabolic diseases as well as mental disorders (e.g. depression). Both annoyance and sleep disturbance are not only determined by the noise exposure, but also to a considerable extent by non-acoustic factors. This chapter summarises the most relevant non-acoustic factors and briefly explains their mechanisms on annoyance and sleep as well as the potential to address these factors via intervention methods aiming at the reduction of adverse noise outcomes and an increase in the quality of life of airport residents. Here, the focus is on airport management measures that are considered to help improve the residents’ coping capacity. Findings from the ANIMA case studies with regard to main aspects of quality of life in airport residents around European airports are briefly reported and recommendations for a community-oriented airport management are derived