Concept paper on processing methods and their labelling

Accurate labelling is a very important part of the organic food concept. Therefore, the aspect of how to develop labelling concepts further down the line is important. Creative labelling solutions must be developed to enable consumers to understand the communication and to avoid additional labelling that leads to misunderstandings. Perhaps new types of labelling systems that guarantee that the product is, for example 'carefully processed' or 'hand-crafted' could also be considered

Parallelizable sparse inverse formulation Gaussian processes (SpInGP)

We propose a parallelizable sparse inverse formulation Gaussian process (SpInGP) for temporal models. It uses a sparse precision GP formulation and sparse matrix routines to speed up the computations. Due to the state-space formulation used in the algorithm, the time complexity of the basic SpInGP is linear, and because all the computations are parallelizable, the parallel form of the algorithm is sublinear in the number of data points. We provide example algorithms to implement the sparse matrix routines and experimentally test the method using both simulated and real data.Comment: Presented at Machine Learning in Signal Processing (MLSP2017

Variable Splitting Methods for Constrained State Estimation in Partially Observed Markov Processes

In this paper, we propose a class of efficient, accurate, and general methods for solving state-estimation problems with equality and inequality constraints. The methods are based on recent developments in variable splitting and partially observed Markov processes. We first present the generalized framework based on variable splitting, then develop efficient methods to solve the state-estimation subproblems arising in the framework. The solutions to these subproblems can be made efficient by leveraging the Markovian structure of the model as is classically done in so-called Bayesian filtering and smoothing methods. The numerical experiments demonstrate that our methods outperform conventional optimization methods in computation cost as well as the estimation performance.Comment: 3 figure

Charge dynamics in two-electron quantum dots

We investigate charge dynamics in a two-electron double quantum dot. The quantum dot is manipulated by using a time-dependent external voltage that induces charge oscillations between the dots. We study the dependence of the charge dynamics on the external magnetic field and on the periodicity of the external potential. We find that for suitable parameter values, it is possible to induce both one-electron and two-electron oscillations between the dots.Comment: 4 pages, 7 figures, proceedings of the Quantum Dot 2010 conferenc

Effect of ozonated water on the microbiological physical and nutritional quality parameters of minimally processed lettuce during shelf-life

Since chlorine is not accepted for treatment of organic products, alternative sanitizing agents are needed to assure the safety and shelf-life of fresh-cut organic vegetables. Therefore, the effect of ozone on the microbiological, nutritional ands sensory quality of lettuce were studied during shelf-life at 4ºC in this project. Ozone gas was produced from extra dry oxygen by means of a corona discharge generator. After spinning, samples were packaged using 35 μm oriented PP bags and stored at 4ºC for 13 days. Sampling was done on days 0, 3, 8, 10, and 13. Analyses include aerobic plate count and psychrotrophic bacteria, vitamin C and sensory quality. One chlorine (100 ppm, 2 min) and one organic acid (0.25% citric acid plus 0.50% ascorbic acid, 2 min) disinfected sample were used as control samples during the shelf-life study, as chlorine is the generally used disinfecting agent in conventional processing and organic acids are one of the few alternatives that can be used for organic products. No significant difference was detected between the microbial quality of ozone, chlorine and organic acid disinfected lettuce samples. Although the vitamin C loss in 3 ppm ozone treated samples were significantly higher than the other samples, no significant difference was observed between chlorine washed and 1 ppm ozone treated samples. At the end of 10 days of storage, at a level of 5 %, no significant difference was observed between chlorine washed and the samples treated with 1 ppm ozone for 2 min