2,186 research outputs found
bioimage-io/spec-bioimage-io: v0.4.9post1
No full textChanges
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<li>requests: set User-Agent to "ci" in a CI environment (#523) @FynnBe</li>
<li>fixed Author & Maintainer schema(require -> required) (#511) @mese79</li>
<li>update and set update_format docstring (#505) @FynnBe</li>
</ul>
:rocket: Features
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<li>add get_resolved_source_path (#508) @FynnBe</li>
<li>add close method to tqdm dummy (#502) @FynnBe</li>
<li>add bioimageio_description to email field (#501) @FynnBe</li>
</ul>
:beetle: Fixes
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<li>fix sha value of weights.onnx (#510) @FynnBe</li>
</ul>
Modelling the orbital-tidal evolution of the Galilean moon Io
No full textIo, the innermost Galilean moon of Jupiter, is the most volcanically active body in the Solar System. Its volcanism is driven by tidal foces, which are in turn sustained by the Laplace resonance between Io, Europa, and Ganymede. Tides have significant impact on a body's characteristics. The liquid ocean underneath Europa's icy surface is sustained by tidal heating. Similarly, tidally-heated exomoons may be able to support life well outside the habitable zone. Tidal forces influence the orbital evolution of a body. Consequently, the orbital evolution also affects the tidal evolution. Thus, it is important to understand how tides drive the Jupiter system and how sustainable the tidal heating that Io experiences is. Additionally, the interior structure of both Jupiter and Io are not very well understood nor constrained, but govern the orbital-tidal evolution via the Love number k2 and the quality factor Q. The orbital motion and tidal evolution of the Jupiter system was modelled. For this, existing TUDAT functions, for example for third-body gravitational acceleration, were combined with new tidal acceleration models. To enable long-term stability and fast computation of the integration a 4 th -order symplectic integrator with Wisdom-Holman split was applied. This type of energy-conserving integrator has limited applicability in the case of small dissipative forces, but requires fewer force evaluation than, for example, a Runge-Kutta integrator of the same order. A variety of reasonable values for k2 and Q have been tested, as well as extreme cases. It was found that the tides raised on Jupiter by Io have a negligible effect on the evolution of the system. On the other hand, the tides raised on Io by Jupiter profoundly impact the evolution of the inner moons. Over the course of five thousand years, Io migrates inwards by several thousand kilometre. In doing so, Europa is brought into a closer orbit as well, to retain the resonance. Similarly, the eccentricity of both Io and Europa decreases, which in turn reduces the dissipated tidal energy and -heating. With Io being in spin-orbit resonance, tidal forces due to tides on Io are not readily applied. Multiple variations of analytical expressions of tides on Io have been evaluated. The results of this thesis provide a qualtiative assessment of the evolution of the Jupiter system and of the sustainability of Io's strong volcanism. The insight gathered on the modelling of tides and their effects on spin-orbit-resonant bodies in particular will benefit future work on the evolution of moons in the Solar System as well as exosystems.Aerospace EngineeringSpace EngineeringMSc Spacefligh
How Much Ice Could an Icy Io Have Lost Through Tidal Heating?: How Much Ice Could an Icy Io Have Lost Through Tidal Heating?
No full textOf the four Galilean satellites the only one without ice is Io. While it is possible that Io never contained any ice the starting point of this research work is an icy Io. As present-day Io does not contain any ice, icy Io must have lost its ice through some sort of ice loss mechanism. In this work the assumed ice loss mechanism is geysers driven by tidal heating. Tidal dissipation of sufficient magnitude is able to melt part of an icy layer creating a subsurface ocean and is also able to crack the overlying icy shell. The subsurface ocean then acts as a reservoir from which water vapor molecules and icy grains accelerate upwards through the cracks and are erupted from the surface. Erupted material with a sufficient velocity is able to escape from icy Io resulting in ice loss.Aerospace Engineerin
Type 2 Diabetes in a Nigerian Adolescent:Diagnostic and Management Challenges in a Resource poor Setting
No full textMaking a market for Miscanthus: Can new contract designs solve the biofuel investment hold-up problem?
No full textWe present designs for optimal contracts to solve the investment hold-up problem for perennial crops for the biofuel industry. A fixed-price contract is ex-ante efficient but renegotiation-proof for a limited range of discount parameters. A perfectly- indexed contract is both renegotiation-proof and ex-post efficient. Provided long-run land prices are stationary, the expected cost for both contracts converges to the long-run expected price of land for a risk-neutral farmer.Biofuels, Miscanthus, contract theory, industrial organization, renegotiation-proof contract, Marketing,
On-chip SPAD array with IO designed for quantum sensing
No full textIn this Bachelor graduation project, a 16x16 Single Photon Avalanche Diode (SPAD) array is designed in 40nm TSMC CMOS for diamond single Nitrogen Vacancy center array readout. It includes an active quenching and recharge circuit (AQC), a hold-off circuit for controllable dead-time and IO electronics for off-chip communication. The chip is part of a proposed high sensitivity magnetometer based on single NV center readout with a focus on detecting cancer in biological samples. From the Quantum Integration Technology (QIT) lab, pre-designed SPADs were received to be implemented into the design together with SPAD quenching, recharge and input-output controller electronics. A SPAD model is adapted from literature for simulations of the electric behaviour of the electronics. We present a design and implementation of the Active Quenching Circuit (AQC), a design and implementation of the recharge and hold-off circuits, Input-Output (IO) interface design and implementation and the final top-level implementation ready for the next tape out. Post-layout simulations show negligible speed slowdown and distortion. The AQC has a 12ns quenching time and a 1ns recharge time, leading to a theoretical maximum count rate of 76Mc/s. The hold-off circuit has a tunable dead-time for afterpulsing reduction and 16, 16 bit parallel-in-serial-out (PISO) modules allow per-row readout of the array. The electronics are co-located with the SPADs and pixel pitch is 24𝜇m. The final chip design meets the single NV fluorescence count rate requirement of above 3 Mc/s, the 1.1x1.1 𝑚𝑚2 area requirement, the 32-pin IO requirement, the 16x16 SPAD pixel requirement and, steps have been taken to ensure acceptable crosstalk levels in the array. Finally, the SPAD array chip is designed to run on a 1GHz clock. It should interface with an FPGA that configures the hold-off circuit and reads out the SPAD status bits.Electrical Engineerin
Volcanism on Io: A Comparison Between the Volcanic Distribution and Tidal Stress
No full textIo is Jupiter's innermost Galilean satellite and the most volcanically active body in the Solar System. Its volcanism is driven by tidal heating generated by its interaction with Jupiter and maintained by other Galilean satellites. The tidal forces acting on Io also cause significant stresses on its interior. It is investigated if tensional stresses play a significant role in the formation of volcanic centers on Io. On a global scale, it is investigated if the locations of maximum tensile stress coincide with the locations of maximum volcanic activity. On a local scale, it is investigated if chains of Io's volcanoes follow the directions of the tensile stresses. The results on a global and local scale are shown to be consistent with the hypothesis that tensional stresses play a significant role in the formation of volcanic centers on Io. However, tensional stresses alone are insufficient for the formation of volcanic centers.Aerospace Engineerin
Io. Gottl. Heineccii fundamenta stili cultioris : nunc demum omnibus Io. Matthiae Gesneri animaduersionibus, emendationibus, additamentis, et praefatione locupletata : accurauit, digessit, suas quoque obseruationes adiecit Nicolaus Niclas.
No full textErrata, 2P8r.Signatures: pi⁸ A-2P⁸Includes "Index II. auctorum" and 3 other indexes.Mode of access: Internet.Signatures of Fr. A. Lange, dated 1856.Binding: sheepskin. Spine gilt tooled with author & title on label. Edges decorated in blue
The regional economic impacts of biofuels: A review of multisectoral modelling techniques and evaluation of applications
No full textThe regional economic impact of biofuel production depends upon a number of interrelated factors: the specific biofuels feedstock and production technology employed; the sector’s embeddedness to the rest of the economy, through its demand for local resources; the extent to which new activity is created. These issues can be analysed using multisectoral economic models. Some studies have used (fixed price) Input-Output (IO) and Social Accounting Matrix (SAM) modelling frameworks, whilst a nascent Computable General Equilibrium (CGE) literature has also begun to examine the regional (and national) impact of biofuel development. This paper reviews, compares and evaluates these approaches for modelling the regional economic impacts of biofuels.biofuels; economic modelling; input-output; social accounting matrix; computable general equilibrium.
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