Nanoflow liquid chromatography-electrospray ionization tandem-mass spectrometry (nanoLC-ESI-MS-MS) was applied for the characterization of intact phosphatidylcholine (PC) lipid molecules using a homemade reversed phase capillary column with a pulled tip for direct ESI at positive ion mode. Prior to the analytical column, a short capillary trapping column was utilized for on-line pre-concentrati...

In this paper the authors present problems which can appear when a sparse square matrix (without any special structure) is factorized to a product of matrices W and Z. The fill-in problem is considered, and the manners of its solving – by permuting both rows and columns with a modified Markowitz scheme among others. The results of numerical experiments for sparse matrices of various sizes are p...

Given a cost matrix W and a positive integer k, the k-cardinality assignment problem is to assign k rows to k columns so that the sum of the corresponding costs is a minimum. This generalization of the classical assignment problem is solvable in polynomial time, either by transformation to min-cost ow or through speciic algorithms. We consider the algorithm recently proposed by Dell'Amico and M...

Submitted Abstract We use column generation and a specialized branching technique for solving constrained clustering problems. We also develop and implement an innovative com-binatorial method for solving the pricing subproblems. Computational experiments comparing the resulting branch-and-price method to competing methodologies in the literature are presented and suggest that our technique yie...

In this paper, we present the experiments we made to recover the original page layout structure into two columns from layout damaged digitized files. We designed several CRF-based approaches, either to identify column separator or to classify each token from each line into left or right columns. We achieved our best results with a model trained on homogeneous corpora (only files composed of 2 c...

This paper describes precision enhancement of an optical three-axis tactile sensor capable of detecting both normal force and tangential force. The sensor’s single cell consists of a columnar feeler and 2-by-2 conical feelers. We have derived equations to precisely estimate the three-axis force from the area-sum and area-difference of the conical feelers’ contact areas by taking into account wr...

Two experiments were conducted to assess the intuitive reasoning of students when examining data from an analysis of variance design. Participants were shown hypothetical datasets that differed with regards to within-group and/or between-group variability, and were asked to judge the amount of evidence that each provided in support of a particular theory. The first experiment (n=57) examined th...

We propose a new model of steganography based on a list of pseudo-randomly sorted sequences of characters. Given a list L of m columns containing n distinct strings each, with low or no semantic relationship between columns taken two by two, and a secret message s ∈ {0, 1}∗, our model embeds s in L block by block, by generating, for each column of L, a permutation number and by reordering strin...

New, non-discoid M(II) complexes [MCl2(L)] {M = Mn, Zn; L = 2,6-diformyl-4methylphenolbis[30,40,50-tris(hexadecyloxy)phenylimine]} have been prepared and shown to exhibit columnar mesophases, the nature of which was found to be metal-dependent. As analysed by DSC and small-angle X-ray diffraction experiments, the complex [ZnCl2(L)] exhibits a single mesophase with rectangular symmetry (Colr) be...

An important problem in the context of wireless sensor networks is the Maximum Network Lifetime Problem (MLP): find a collection of subset of sensors (cover) each covering the whole set of targets and assign them an activation time so that network lifetime is maximized. In this paper we consider a variant of MLP, where we allow each cover to neglect a certain fraction (1−α) of the targets. We a...