| 1. |
- Kehoe, Laura, et al.
(author)
-
Make EU trade with Brazil sustainable
- 2019
-
In: Science. - : American Association for the Advancement of Science (AAAS). - 0036-8075 .- 1095-9203. ; 364:6438, s. 341-
-
Journal article (other academic/artistic)
|
|
| 2. |
- Reinhold, Ingo, et al.
(author)
-
Inkjet Printing of Electrical Connections in Electronic Packaging
- 2011
-
In: NIP27 : 27th International Conference on Digital Printing Technologies, October 2-6, 2011, Minneapolis, Minnesota ; Digital Fabrication 2011. - : The Society for Imaging Science and Technology. - 9780892082964 ; , s. 445-451
-
Conference paper (peer-reviewed)abstract
- Two aspects were evaluated of an approach to produce inkjet printed electrical connections in a roll-to-roll application. In the first part it was demonstrated that inkjet printing with silver nanoparticles allows to connect LED dies embedded in a flexible polymeric substrate by way of electrical via connections and to operate the LED dies at their nominal 20 mA and 3 V driving conditions. A standard convection oven process was used to sinter the inkjet printed tracks. The second part of the work focused on identifying sinter technologies that provide the required fast processing times needed for roll-to-roll applications. IR irradiation, Rapid Electrical Sintering, and Broadband Photonic Curing were evaluated and compared with Convective Oven Sintering as benchmark technique. All these techniques produced similar track conductivities. Fastest operation was obtained with Broadband Photonic Curing, which enabled a total process time of three seconds as compared with 150°C and 30 min in the convection oven.
|
|
| 3. |
- Reinhold, Ingo, et al.
(author)
-
Spectrally Enhanced Photonic Sintering
- 2012
-
In: NIP28 : 28th international conference on digital printing technologies : technical program and proceedings. - : The Society for Imaging Science and Technology. - 9780892083022 ; , s. 424-430
-
Conference paper (peer-reviewed)abstract
- Inkjet printing with silver nanoparticle inks is frequently being used to print electrically conductive structures. However, typically slow thermal post-processes are applied to produce metallic contact between the nanoparticles resulting in the high electrical conductivity. In an earlier evaluation a number of different post-process were investigated for their capability to sinter the inkjet printed structures within such short time frame to allow for integration into roll-to-roll or roll-to-sheet machines. Among the different techniques like IR-irradiation, and Rapid Electrical Sintering, Photonic Sintering appeared as the most prominent candidate, and was shown to enable electrical conductivities equal to oven sintering. In that previous investigation the inkjet printed structures were dried and subsequently shipped for off-line post treatment. The hybrid process of inkjet printing of silver nanoparticle inks and photonic sintering was further investigated with the goal to implement both processes on a roll-to-roll machine. Specifically it was attempted to perform the photonic sintering process with a single lamp and without an intermediate drying process. In this paper we investigate the sintering characteristics of an inkjet printed, wet deposit having liquid volumes of 510 pL per 100 μm2 on non-absorbing substrates using a single Xenon Sintering 2000 system. The paper specifically highlights the importance of radiation homogeneity, threshold energy, substrate and track morphology onto the sintering process. The influence of the spectral composition of the light is analyzed. The findings allow for spectral tailoring of the process to successfully work on PI and PET irrespective of the illumination source.
|
|
| 4. |
- Bert, Valérie, et al.
(author)
-
How to manage plant biomass originated from phytotechnologies? : Gathering perceptions from end-users
- 2017
-
In: International journal of phytoremediation. - : Taylor & Francis. - 1522-6514 .- 1549-7879. ; 19:10, s. 947-954
-
Journal article (peer-reviewed)abstract
- A questionnaire survey was carried out in 4 European countries to gather end-user's perceptions of using plants from phytotechnologies in combustion and anaerobic digestion (AD). 9 actors of the wood energy sector from France, Germany and Sweden, and 11 AD platform operators from France, Germany and Austria were interviewed. Questions related to installation, input materials, performed analyses, phytostabilization and phytoextraction. Although the majority of respondents did not know phytotechnologies, results suggested that plant biomass from phytomanaged areas could be used in AD and combustion, under certain conditions. As a potential advantage, these plants would not compete with plants grown on agricultural lands, contaminated lands being not suitable for agriculture production. Main limitations would be related to additional controls in process' inputs and end-products and installations that might generate additional costs. In most cases, price of phytotechnologies biomass was mentioned as a driver to potentially use plants from metal-contaminated soils. Plants used in phytostabilisation or phytoexclusion were thought to be less risky and, consequently, benefited from a better theoretical acceptance than those issued from phytoextraction. Results were discussed according to national regulations. One issue related to the regulatory gap concerning the status of the plant biomass produced on contaminated land.
|
|
| 5. |
|
|
| 6. |
- Dreyer, Joshua, 1993-
(author)
-
Diving Deep into Saturn's Equatorial Ionosphere with Cassini : Insights from the Grand Finale
- 2023
-
Doctoral thesis (other academic/artistic)abstract
- In the summer of 2017, the Cassini mission concluded its nearly 13 years orbiting Saturn with a series of daring dives between the rings and the upper reaches of Saturn's atmosphere. This last phase of the mission, called the Grand Finale, revealed a highly variable equatorial ionosphere dominated by a large influx of ring material from Saturn's D ring. The papers included in this thesis utilize data gathered during these proximal orbits to gain insights into the nature and effects of the infalling ring material.Initially, we derive upper limits for the effective recombination coefficient in Saturn's equatorial ionosphere at altitudes below 2500 km, where photochemical equilibrium can be assumed, to constrain the composition of the positive ion species. Our inceptive results indicate that ion species with low recombination coefficients are dominant.We follow up on this by developing a photochemical model, incorporating grain charging, to investigate the effects of the ring influx on the plasma composition. The model results at an altitude of 1700 km yield vastly different abundances of two types of neutral species when compared to those derived from measurements, ultimately representing the difficulty of reconciling the observed H+ and H3+ densities with our and other model results.Exploring the nature of narrow decreases in the ionospheric H2+ densities reveals a time shift in the ion data. After correcting for this, the decreases line up very well with calculated shadows for substructures in Saturn's C ring. We can further estimate the optical depths of these substructures and investigate at which altitudes photochemical equilibrium for H2+ is applicable.The direct measurement of heavier neutral species during the proximal orbits is complicated by the high spacecraft speed. We devise a method to utilize helium ion chemistry to independently derive the mixing ratios of these heavier neutrals in Saturn's ionosphere. Our results show considerable variability, which may suggest temporal and/or spatial changes in the ring influx. A comparison with other studies indicates that potentially only the most volatile ring-sourced species significantly ablate to enter the gas phase in this region of Saturn's ionosphere.Finally, we compare the fixed-bias Langmuir probe electron densities and the light ion densities. They exhibit a strong positive correlation for most parts of the proximal orbits even on short timescales. We find three distinct regions in the proximal orbits, which can provide further insight into the ionospheric composition, connection to the rings, and measurement uncertainties.
|
|
| 7. |
- Farraj, Yousef, et al.
(author)
-
Ink-Jet Printed Copper Complex MOD Ink for Plastic Electronics
- 2014
-
In: International Conference on Non Impact Printing and Digital Fabrication. - 9780892083114 ; , s. 191-193
-
Conference paper (peer-reviewed)abstract
- The development of highly conductive copper patterns on low-cost flexible substrates (PET, PEN, etc.) by inkjet printing is reported. Copper films were obtained from a metallo-organic decomposition (MOD) ink composed of a copper complex and suitable low-viscosity solvents. Upon heating the ink decomposed and was converted into metallic copper under nitrogen as inert atmosphere.Additionally samples were prepared using inkjet technology on various substrates. The required layer thickness for current conduction was assessed by printing on PET and sintering at 150 °C in a vacuum oven.
|
|
| 8. |
- Fletcher, Leigh N., et al.
(author)
-
Jupiter Science Enabled by ESA's Jupiter Icy Moons Explorer
- 2023
-
In: Space Science Reviews. - : Springer Nature. - 0038-6308 .- 1572-9672. ; 219:7
-
Research review (peer-reviewed)abstract
- ESA's Jupiter Icy Moons Explorer (JUICE) will provide a detailed investigation of the Jovian system in the 2030s, combining a suite of state-of-the-art instruments with an orbital tour tailored to maximise observing opportunities. We review the Jupiter science enabled by the JUICE mission, building on the legacy of discoveries from the Galileo, Cassini, and Juno missions, alongside ground- and space-based observatories. We focus on remote sensing of the climate, meteorology, and chemistry of the atmosphere and auroras from the cloud-forming weather layer, through the upper troposphere, into the stratosphere and ionosphere. The Jupiter orbital tour provides a wealth of opportunities for atmospheric and auroral science: global perspectives with its near-equatorial and inclined phases, sampling all phase angles from dayside to nightside, and investigating phenomena evolving on timescales from minutes to months. The remote sensing payload spans far-UV spectroscopy (50-210 nm), visible imaging (340-1080 nm), visible/near-infrared spectroscopy (0.49-5.56 & mu;m), and sub-millimetre sounding (near 530-625 GHz and 1067-1275 GHz). This is coupled to radio, stellar, and solar occultation opportunities to explore the atmosphere at high vertical resolution; and radio and plasma wave measurements of electric discharges in the Jovian atmosphere and auroras. Cross-disciplinary scientific investigations enable JUICE to explore coupling processes in giant planet atmospheres, to show how the atmosphere is connected to (i) the deep circulation and composition of the hydrogen-dominated interior; and (ii) to the currents and charged particle environments of the external magnetosphere. JUICE will provide a comprehensive characterisation of the atmosphere and auroras of this archetypal giant planet.
|
|
| 9. |
- Haak, Wolfgang, et al.
(author)
-
The Corded Ware Complex in Europe in Light of Current Archaeogenetic and Environmental Evidence
- 2023
-
In: The Indo-European Puzzle Revisited : Integrating Archaeology, Genetics, and Linguistics - Integrating Archaeology, Genetics, and Linguistics. - 9781009261746 - 9781009261753 ; , s. 63-80
-
Book chapter (other academic/artistic)abstract
- Corded Ware is one of the main archaeological phenomena of the third millennium before the common era (BCE), with a wide geographic spread across much of central and northeastern Europe, from Denmark, the Rhineland, and Switzerland in the west to the Baltic and Western Russia in the east, and broadly restricted to the temperate, continental zones north of the Alps, the Carpathians, and the steppe/forest steppe border to the east (Glob 1944; Strahm and Buchvaldek 1991; Furholt 2014).
|
|
| 10. |
- Hinz, Martin, et al.
(author)
-
Demography and the intensity of cultural activities: an evaluation of funnel beaker societies (4200-2800 cal BC)
- 2012
-
In: Journal of Archaeological Science. - : Elsevier BV. - 0305-4403. ; 39:10, s. 3331-3340
-
Journal article (peer-reviewed)abstract
- The Early and Middle Neolithic in Northern Central Europe and Southern Scandinavia is characterised by substantial changes in economic technology as well as in material culture in different periods. One of the main drivers for social development, but also for anthropogenic changes in the environment, is surely shifts in population density. To evaluate group sizes and population density we need archaeological proxies. Similar to other studies, we use 14C dates to reconstruct the intensity of prehistoric activities. A comparison of the human impact from pollen data with a quantification based on 14C dates proves a correlation which supports our appreciation of the value of sum-calibrated probabilities of radiometric measurements as a proxy for demographic developments. The large amount of usable dates in this study not only enables us to draw general conclusions on a supraregional level, but also makes it possible for us to compare the character of different areas on a regional scale. As a result, we reconstruct a significant rise in population between 4100-3500 cal BC and a degression around 3350-3100 cal BC, followed by a reiterated increase for the Funnel Beaker West and North Groups. On the Danish Isles, as well as in the Funnel Beaker North Eastern Group, different tendencies are observable.
|
|
