Feedback computability on Cantor space

We introduce the notion of feedback computable functions from $2^\omega$ to $2^\omega$, extending feedback Turing computation in analogy with the standard notion of computability for functions from $2^\omega$ to $2^\omega$. We then show that the feedback computable functions are precisely the effectively Borel functions. With this as motivation we define the notion of a feedback computable function on a structure, independent of any coding of the structure as a real. We show that this notion is absolute, and as an example characterize those functions that are computable from a Gandy ordinal with some finite subset distinguished

Realising the potential of thermoelectric technology: a roadmap

All machines from jet engines to microprocessors generate heat, as do manufacturing processes ranging from steel to food production. Thermoelectric generators (TEGs) are solid-state devices able to convert the resulting heat flux directly into electrical power. TEGs therefore have the potential to offer a simple, compact route to power generation in almost every industrial sector. Here, in a Roadmap developed with wide-ranging contributions from the UK Thermoelectric Network and international partners, we present the science and technology that underpins TEGs. We outline how thermoelectric (TE) technology capable of generating power outputs from microwatts to tens/hundreds kW, and potentially to MW, can have an impact across a wide range of applications in powering devices, ranging from medical to building monitoring, the Internet of things, transportation and industrial sectors. The complementary application of TE technology in cooling affords additional opportunities in refrigeration and thermal management. Improved waste heat harvesting and recovery and more efficient cooling offer significant opportunities to reduce energy usage and CO2 emissions. We provide an overview of the key challenges associated with the development of new materials and devices that offer higher power output, while matching TE solutions to the wide range of applications that would benefit from energy harvesting. There is an existing supply chain to develop, manufacture and integrate thermoelectric devices into a broad range of end-user sectors all with global market potential: the full realisation of which will require new state-of-the-art manufacturing techniques to be embraced in order to drive down costs through high-volume manufacturing to widen the application base

Thermal performance of two heat exchangers for thermoelectric generators

Thermal performance of heat exchanger is important for potential application in integrated solar cell/module and thermoelectric generator (TEG) system. Usually, thermal performance of a heat exchanger for TEGs is analysed by using a 1D heat conduction theory which ignores the detailed phenomena associated with thermo-hydraulics. In this paper, thermal and mass transports in two different exchangers are simulated by means of a steady-state, 3D turbulent flow k -e model with a heat conduction module under various flow rates. In order to simulate an actual working situation of the heat exchangers, hot block with an electric heater is included in the model. TEG model is simplified by using a 1D heat conduction theory, so its thermal performance is equivalent to a real TEG. Natural convection effect on the outside surfaces of the computational model is considered. Computational models and methods used are validated under transient thermal and electrical experimental conditions of a TEG. It is turned out that the two heat exchangers designed have a better thermal performance compared with an existing heat exchanger for TEGs, and more importantly, the fin heat exchanger is more compact and has nearly half temperature rise compared with the tube heat exchanger

Growing Vitis vinifera grapes in New York State. I - Performance of new and interesting varieties

47 pages, includes color images. Varieties: Bacchus, Cabernet Sauvignon, Cabernet franc, Chardonnay, Clevener Mariafeld, Comtessa, Ehrenfelser, Furmint, Gamay Beaujolais, Gewurztraminer, Melon, Merlot, Metternich, Morio Muscat, Muscat Ottonel, Noblessa, Optima, Ortega, Perle, Petit Sirah, Pinot blanc, Pinot gris, Pinot noir, Portugieser Blau(er), Reichensteiner, Rieslaner, Sauvignon blanc, Scheurebe, Siegerrebe, Spatburgunder (Blauer), Sylvaner, White Riesling, Zinfandel.Issued circa 1990, this publication is a collaborative effort between the New York Wine & Grape Foundation and the Communications Services unit of the New York State Agricultural Experiment Station, Cornell University, Geneva NY. This is the only report in the series (although subsequent titles were originally planned). It describes 33 varieties of Vitis vinifera which were evaluated for potential use in New York State –of those, 11 are recommended. Some history and background information is given as well as regional precipitation and temperature data for grape test sites