A preconcentration/separation procedure is presented for the solid phase extractionof trace cadmium and lead ions as their 2-propylpiperidine-1-carbodithioate (PPCD) chelates inenvironmental samples on Nano Graphene, prior to cadmium and lead determinations by atomicabsorption spectrometry. The preconcentration procedure was optimized by using model solutionscontaining c...

The novel nanocomposite membranes were successfully prepared by the incorporation of different concentrations (5, 10, and 15 wt%) of montmorillonite (MMT) as a nanoadditive into a blend of chitosan/polystyrene (CS/PS) at a ratio of 3:1 on the basis of solution-casting method and they were subsequently used for the separation of phenol, p-chlorophenol, and 2,4-dichlorophenol from water through p...

Poly (phenylene-ether-ether) sulfone membrane was fabricated and characterized by efficient glycerol/biodiesel separation produced from waste cooking oils trans-esterification. The membrane preparation was processed by phase inversion technique. The morphology, Physico-chemical properties and separation behavior of membranes were studied at various PPEES concentration. A uniform surface was...

Separation of duties is an important, real-world requirement that access control models should support. In 13], Sandhu introduced the transaction control expression (TCE) for specifying dynamic separation of duties. In this paper we consider the implementation of TCEs in the typed access matrix model (TAM) recently proposed by Sandhu 16]. We show that TAM requires extension for satisfactory han...

Separation of duties is an important, real-world requirement that access control models should support. In [13], Sandhu introduced the transaction control expression (TCE) for specifying dynamic separation of duties. In this paper we consider the implementation of TCEs in the typed access matrix model (TAM) recently proposed by Sandhu [16]. We show that TAM requires extension for satisfactory h...

Nonnegative Matrix Factorization (NMF) is an approximative low-rank matrix factorization which is frequently applied for source separation of audio signals (see e.g. [1]). The quality of source separation algorithms using NMF strongly depends on the initialization of the NMF. Very often, random values are used for initialization. Several other initialization strategies have been developed, with...

Active fault diagnosis (AFD) of parametric faults is considered in connection with closed loop feedback systems. AFD involves auxiliary signals applied on the closed loop system. A fault signature matrix is introduced in connection with AFD and it is shown that if a limited number of faults can occur in the system, a fault separation in the fault signature matrix can be obtained. Then the singl...

Electromyographic (EMG) signal directly represents muscle activity. When recording EMG signals of closely located muscles on skin surface the problem of source separation arises, each acquired channel records signals coming from different muscles [1]. Working on extrinsic finger extensors EI (index) and EDM (little finger) provides a system with muscles that are closely located and independentl...

Conventional NMF methods for source separation factorize the matrix of spectral magnitudes. Spectral Phase is not included in the decomposition process of these methods. However, phase of the speech mixture is generally used in reconstructing the target speech signal. This results in undesired traces of interfering sources in the target signal. In this paper the spectral phase is incorporated i...