The development of a novel, selective desulfurization process

The removal of hydrogen sulfide from natural, industrial of bio gas is an operation that is frequently encountered in process industry. Driven by tight sulfur specifications and the everlasting need for cost reduction a considerable research effort is made in this field,\ud sprouting numerous new developments in desulfurization technology.\ud The procede desulfurization process is a regenerative process that is capable of removing H2S from a gas stream without the uptake of CO2. The removal of H2S is selective since the absorption process is based on the precipitation reaction of H2S with metal ions present in an aqueous solution under the formation of metal sulfide

Online backchannel synthesis evaluation with the switching Wizard of Oz

In this paper, we evaluate a backchannel synthesis algorithm in an online conversation between a human speaker and a virtual listener. We adopt the Switching Wizard of Oz (SWOZ) approach to assess behavior synthesis algorithms online. A human speaker watches a virtual listener that is either controlled by a human listener or by an algorithm. The source switches at random intervals. Speakers indicate when they feel they are no longer talking to a human listener. Analysis of these responses reveals patterns of inappropriate behavior in terms of quantity and timing of backchannels

Efficient Optimization of Echo State Networks for Time Series Datasets

Echo State Networks (ESNs) are recurrent neural networks that only train their output layer, thereby precluding the need to backpropagate gradients through time, which leads to significant computational gains. Nevertheless, a common issue in ESNs is determining its hyperparameters, which are crucial in instantiating a well performing reservoir, but are often set manually or using heuristics. In this work we optimize the ESN hyperparameters using Bayesian optimization which, given a limited budget of function evaluations, outperforms a grid search strategy. In the context of large volumes of time series data, such as light curves in the field of astronomy, we can further reduce the optimization cost of ESNs. In particular, we wish to avoid tuning hyperparameters per individual time series as this is costly; instead, we want to find ESNs with hyperparameters that perform well not just on individual time series but rather on groups of similar time series without sacrificing predictive performance significantly. This naturally leads to a notion of clusters, where each cluster is represented by an ESN tuned to model a group of time series of similar temporal behavior. We demonstrate this approach both on synthetic datasets and real world light curves from the MACHO survey. We show that our approach results in a significant reduction in the number of ESN models required to model a whole dataset, while retaining predictive performance for the series in each cluster

Search for Barents: Evaluation of possible burial sites on north Novaya Zemlya, Russia

Three cairns on northernmost Novaya Zemlya identified as possible rock-pile graves by Russian investigators in 1977 and 1988 were located and inspected for human remains. These cairns are in the area visited by Dutch seafarers between 17 and 22 June 1597, after their wintering on Novaya Zemlya, and may contain the body of Willem Barents. Barents and one of his crewmen died on 20 June 1597 while the winterers were on landfast ice close to shore. Previous research on Spitsbergen and contemporary reports on the efforts of 16th and 17th century Dutch seafarers to prepare a Christian grave led us to conclude that the deceased probably were buried on the beach, possibly in a shallow grave or a snowbank. Inspection of the area indicates that this grave probably was destroyed by high (5+ m asl) wave run-up during storms, cryogenic erosion, and animals (polar bear, fox). None of the cairns, or any of several other prominent rock piles in the ~180 km long search area, contained human remains or had lichen growths that would indicate construction ~400 years ago (>2 cm, Rhizocarpon sp.). Cairns were not reported by the Dutch in 1594-98, and most of those encountered on northern Novaya Zemlya probably date from exploration after ca. 1860, when the region north of ~76°N became accessible in a warming, post-Little Ice Age climat

Representing multifunctional cities: density and diversity in space and time

In this paper, we define measures of urban diversity, density and segregation using newdata and software systems based on GIS. These allow us to visualise the meaning of themultifunctional city. We begin with a discussion of how cities have become moresegregated in their land uses and activities during the last 200 years and how the currentfocus is on reversing this trend through limiting urban sprawl and bringing new lifeback to the inner and central city. We define various indices which show how diversityand density manifest themselves spatially. We argue that multifunctionalism is a relativeconcept, dependent upon the spatial and temporal scale that we use to think about themixing and concentration of urban land uses. We present three examples using spatiallysmoothed indicators of diversity: for a world city ? London, for a highly controlledpolycentric urban region ? Randstad Holland, and for a much more diffusely populatedsemi-urban region ? Venice-Padua-Teviso. We conclude by illustrating that urbandiversity varies as people engage in different activities associated with different landuses throughout the day, as well as through the vertical, third dimension of the city. Thisimpresses the point that we need to understand multifunctional cities in all theirdimensions of space and time

Smart Card Fault Injections with High Temperatures

Power and clock glitch attacks on smart cards can help an attacker to discover some internal secrets or bypass certain security checks. Also, an attacker can manipulate the temperature and supply voltage of the device, thus making the device glitch more easily. If these manipulations are within the device operating conditions, it becomes harder to distinguish between an extreme condition from an attacker. To demonstrate temperature and power supply effect on fault attacks, we perform several tests on an Atmega 163 microcontroller in different conditions. Our results show that this kind of attacks are still a serious threat to small devices, whilst maintaining the manufacturer recommendations

Simulating carbon exchange using a regional atmospheric model coupled to an advanced land-surface model

A large scale mismatch exists between our understanding and quantification of ecosystem atmosphere exchange of carbon dioxide at local scale and continental scales. This paper will focus on the carbon exchange on the regional scale to address the following 5 question: What are the main controlling factors determining atmospheric carbon dioxide content at a regional scale? We use the Regional Atmospheric Modelling System (RAMS), coupled with a land surface scheme simulating carbon, heat and momentum fluxes (SWAPS-C), and including also sub models for urban and marine fluxes, which in principle include the main controlling mechanisms and capture the relevant dynamics 10 of the system. To validate the model, observations are used which were taken during an intensive observational campaign in the central Netherlands in summer 2002. These included flux-site observations, vertical profiles at tall towers and spatial fluxes of various variables taken by aircraft. The coupled regional model (RAMS-SWAPS-C) generally does a good job in sim15 ulating results close to reality. The validation of the model demonstrates that surface fluxes of heat, water and CO2 are reasonably well simulated. The comparison against aircraft data shows that the regional meteorology is captured by the model. Comparing spatially explicit simulated and observed fluxes we conclude that in general simulated latent heat fluxes are underestimated by the model to the observations which exhibit 20 large standard deviation for all flights. Sensitivity experiments demonstrated the relevance of the urban emissions of carbon dioxide for the carbon balance in this particular region. The same test also show the relation between uncertainties in surface fluxes and those in atmospheric concentrations

An Animation Framework for Continuous Interaction with Reactive Virtual Humans

We present a complete framework for animation of Reactive Virtual Humans that offers a mixed animation paradigm: control of different body parts switches between keyframe animation, procedural animation and physical simulation, depending on the requirements of the moment. This framework implements novel techniques to support real-time continuous interaction. It is demonstrated on our interactive Virtual Conductor