602 research outputs found
Modeling and Designing of Controllers for pH Process
Studies on pH control in process engineering have shown a dramatic increase in the last decades. pH control systems were developed and used successfully on various applications of pH process plants in many industries especially in chemical processes, biotechnological industries, wastewater treatment and pharmaceuticals. The pH process is considered as a benchmark problem. Thus the research is ongoing on identification and control in pH process. In this paper, the mathematical model has been developed for a chemical process (pH process) and the conventional controllers such as PI and PID, Tyreus-Luyben has been designed and implemented. A control strategy based on tuning of a PID controller with Internal model controller (IMC), Direct synthesis method has been designed and implemented in the pH process. The experimental and simulation results obtained by various control algorithms are discussed
3D Face Recognition using Significant Point based SULD Descriptor
In this work, we present a new 3D face recognition method based on Speeded-Up
Local Descriptor (SULD) of significant points extracted from the range images
of faces. The proposed model consists of a method for extracting distinctive
invariant features from range images of faces that can be used to perform
reliable matching between different poses of range images of faces. For a given
3D face scan, range images are computed and the potential interest points are
identified by searching at all scales. Based on the stability of the interest
point, significant points are extracted. For each significant point we compute
the SULD descriptor which consists of vector made of values from the convolved
Haar wavelet responses located on concentric circles centred on the significant
point, and where the amount of Gaussian smoothing is proportional to the radii
of the circles. Experimental results show that the newly proposed method
provides higher recognition rate compared to other existing contemporary models
developed for 3D face recognition
Absorption & Fluorescence Spectra of Phenosafranin in Aqueous Solutions in Presence of Alkylamines
237-23
Ovarian cancer plasticity and epigenomics in the acquisition of a stem-like phenotype
Aggressive epithelial ovarian cancer (EOC) is genetically and epigenetically distinct from normal ovarian surface epithelial cells (OSE) and early neoplasia. Co-expression of epithelial and mesenchymal markers in EOC suggests an involvement of epithelial-mesenchymal transition (EMT) in cancer initiation and progression. This phenomenon is often associated with acquisition of a stem cell-like phenotype and chemoresistance that correlate with the specific gene expression patterns accompanying transformation, revealing a plasticity of the ovarian cancer cell genome during disease progression
Recommended from our members
Correlation of Patient Symptoms With Labral and Articular Cartilage Damage in Femoroacetabular Impingement.
BackgroundFemoroacetabular impingement (FAI) can lead to labral and articular cartilage injuries as well as early osteoarthritis of the hip. Currently, the association of patient symptoms with the progression of labral and articular cartilage injuries due to FAI is poorly understood.PurposeTo evaluate the correlation between patient-reported outcome (PRO) scores and cartilage compositional changes seen on quantitative magnetic resonance imaging (MRI) as well as cartilage and labral damage seen during arthroscopic surgery in patients with FAI.Study designCohort study; Level of evidence, 3.MethodsPatients were prospectively enrolled before hip arthroscopic surgery for symptomatic FAI. Patients were included if they had cam-type FAI without radiographic arthritis. All patients completed PRO scores, including the Hip disability and Osteoarthritis Outcome Score (HOOS) and a visual analog scale for pain. MRI with mapping sequences (T1ρ and T2) on both the acetabular and femoral regions was performed before surgery to quantitatively assess the cartilage composition. During arthroscopic surgery, cartilage and labral injury grades were recorded using the Beck classification. Pearson and Spearman correlation coefficients were then obtained to evaluate the association between chondrolabral changes and PRO scores.ResultsA total of 46 patients (46 hips) were included for analysis (mean age, 35.5 years; mean body mass index [BMI], 23.9 kg/m2; 59% male). Increasing BMI was correlated with a more severe acetabular cartilage grade (ρ = 0.37; 95% CI, 0.08-0.65). A greater alpha angle was correlated with an increased labral tear grade (ρ = 0.59; 95% CI, 0.37-0.82) and acetabular cartilage injuries (ρ = 0.61; 95% CI, 0.42-0.80). With respect to PRO scores, increasing femoral cartilage damage in the anterosuperior femoral head region, as measured on quantitative MRI using T1ρ and T2 mapping, correlated with lower (worse) scores on the HOOS Activities of Daily Living (r = 0.35; 95% CI, 0.06-0.64), Symptoms (r = 0.32; 95% CI, 0.06-0.57), and Pain (r = 0.31; 95% CI, 0.06-0.55) subscales. There was no correlation between PRO scores and acetabular cartilage damage or labral tearing found on quantitative MRI or during arthroscopic surgery.ConclusionFemoral cartilage damage, as measured on T1ρ and T2 mapping, appears to have a greater correlation with clinical symptoms than acetabular cartilage damage or labral tears in patients with symptomatic FAI
Effect of optimal uncoupling in enhancing synchronization stability in coupled chaotic systems
In this paper, we report a novel approach for studying the effect of optimal
uncoupling on the stability of synchronization in coupled chaotic systems. The
clipping of phase space of the driven system having an orientation along the
coordinate axes revealing the nature of coupling of the state variables of
coupled systems is identified in certain coupled third-order chaotic systems.
The stability of synchronization is studied through the {\emph{Master Stability
Function}} (MSF). The optimal directions of implementing the clipping width to
achieve stable synchronization is observed by studying the effectiveness of
clipping fraction and the sufficient range of orientation to identify the
optimal directions is reported. The functional work steps for identifying the
optimal directions are presented and the synchronization of the response system
with the drive within the clipped region of phase space for different
orientations of clipping width are studied. The stability of synchronization
for different orientations of clipping widths and the two-parameter bifurcation
diagram indicating the negative valued MSF regions obtained for the optimal
direction of clipping width are presented. The application of the method of
optimal uncoupling in identifying the direction of implication of clipping
width is discussed and the range of orientation over which the clipping width
has to be varied is generalized.Comment: 19 pages, 8 figure
- …