52 research outputs found
Chypre : quatre années de souffrances
No full textModinos Polys. Chypre : quatre années de souffrances. In: Politique étrangère, n°5 - 1978 - 43ᵉannée. pp. 549-556
Bernstein Polynomials: Properties and Applications to Bezier Curves, B-Splines, and Solution of Boundary Value Problems: Properties and Applications to Bezier Curves, B-Splines and Solution of Boundary Value Problems
No full textBernstein polynomials (aka, B-polys) have excellent properties allowing them to be used as basis functions in many applications of physics. In this paper, a brief tutorial description of their properties is given and then their use in obtaining B-polys, B-splines or Basis spline functions, Bezier curves and ODE solution curves, is computationally demonstrated. An example is also described showing their application to solving a fourth-order BVP relating to the bending at the free end of a cantilever
Preparation and Spectroscopic Studies of Rhodamine 6G Doped Polystyrene
No full textAbs tract: In the present work, polys tyrene (Ps ) doped with Rhodamine 6G was prepared. The infrared abs orption s pectra were obtained and dis c u s s e d in the range (400-4000 cm ). A new band appeared -1 2 at 3300 cm due to NH in the s pectra of PS-Rhodamine 6G. In the s pectra of Ps -Rhodamine 6 -1 G this band appeared at 1599 as s igned to C = O s tretching vibration. This is due to interaction between the oxy g e n a n d nitrogen atoms in Rhodamine 6G and polys tyrene. The s pectrum of pure polys tyrene s hows abs orption peak at 1069cm this band related to C)H s keletal vibra t io n s hifted to -1 1076 cm in polys tyrene with Rhod a min e 6G. The electronic spectra were measured in the range -1 (200-900 nm). A ls o, the flu o re s cence s pectra were s tudied. The electrical properties were meas ured in the temperature range (300-423 K). The activation energy was calculated and dis cus s ed
Characteristics of eligible studies included in the meta-analysis.
No full text<p>Abbreviations: NIDDM: non-insulin-dependent diabetes mellitus. DM: diabetes mellitus. C-C: Case-control. PDR: proliferative diabetic retinopathy. DR: diabetic retinopathy. WHO: World Health Organization guidelines. ETDRS: the Early Treatment Diabetic Retinopathy Study. Polys: genotype combinations of polymorphisms. N/A: Not applicable.</p
JMJD6 regulates splicing of its own gene resulting in alternatively spliced isoforms with different nuclear targets.
No full textJumonji-domain-containing protein 6 (JMJD6) is a Fe(II) and 2-oxogluterate (2OG) dependent oxygenase involved in gene regulation through post-translationally modifying nuclear proteins. It is highly expressed in many cancer types and linked to tumor progression and metastasis. Four alternatively-splicedjmjd6transcripts were annotated. Here, we focus on the two most abundantly expressed ones, which we calljmjd6-2andjmjd6-Ex5.TCGA SpliceSeqdata revealed a significant decrease ofjmjd6-Ex5transcripts in patients and postmortem tissue of several tumors. The two protein isoforms are distinguished by their C-terminal sequences, which include a serine-rich region (polyS-domain) in JMJD6-2 that is not present in JMJD6-Ex5. Immunoprecipitation followed by LC-MS/MS for JMJD6-Ex5 shows that different sets of proteins interact with JMJD6-2 and JMJD6-Ex5 with only a few overlaps. In particular, we found TFIIF-associating CTD phosphatase (FCP1), proteins of the survival of motor neurons (SMN) complex, heterogeneous nuclear ribonucleoproteins (hnRNPs) and upstream binding factor (UBF) to interact with JMJD6-Ex5. Like JMJD6-2, both UBF and FCP1 comprise a polyS-domain. The polyS domain of JMJD6-2 might block the interaction with polyS-domains of other proteins. In contrast, JMJD6-2 interacts with many SR-like proteins with arginine/serine-rich (RS)-domains, including several splicing factors. In an HIV-based splicing reporter assay, co-expression of JMJD6-2 inhibited exon inclusion, whereas JMJD6-Ex5 did not have any effect. Furthermore, the silencing ofjmjd6by siRNAs favoredjmjd6-Ex5transcripts, suggesting that JMJD6 controls splicing of its own pre-mRNA. The distinct molecular properties of JMJD6-2 and JMJD6-Ex5 open a lead into the functional implications of the variations of their relative abundance in tumors
On the Use of B-Splines as Ritz Variational Basis Functions to Solve the Schrodinger Equation (TISE) for a constrained free Quantum Particle
No full textB-Splines as piecewise adaptation of Bernstein polynomials (aka, B-polys) are widely used as Ritz variational basis functions in solving many problems in the fields of quantum mechanics and atomic physics. In this paper they are used to solve the 1-D stationary Schrodinger equation (TISE) for a free quantum particle subject to a fixed domain length by using the Python software SPLIPY with different sets of computation parameters. In every case it was found that over 60 percent of energy levels had excellent accuracy thereby proving that the use of B-spline collocation is a preferred method
Using Web3D Technologies for Visualization and Search of Signs in an International Sign Language Dictionary
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Automatic 3D medical image registration
No full text63 σ.Σκοπός της παρούσας διπλωματικής εργασίας είναι η παρουσίαση μιας μεθόδου αυτόματης ευθυγράμμισης τρισδιάστατων ιατρικών δεδομένων. Η διαδικασία της ευθυγράμμισης έχει ως στόχο τη διόρθωση των σχετικών μετατοπίσεων στο χώρο έτσι ώστε στα ευθυγραμμισμένα δεδομένα οι ίδιες ανατομικές περιοχές να συμπίπτουν χωρικά.
Η μέθοδος μπορεί να χρησιμοποιηθεί για την ευθυγράμμιση ακτινολογικών εικόνων που λαμβάνονται μέσω υπολογιστικής αξονικής τομογραφίας και χρησιμοποιούνται από οδοντιάτρους για παρακολούθηση και αξιολόγηση θεραπευτικών διαδικασιών. Αφού γίνει λήψη ακτινολογικών εικόνων του ιδίου αντικειμένου πριν και μετά τη θεραπεία, είναι επιθυμητό οι εικόνες αυτές να αφαιρεθούν ώστε να παρατηρηθούν οι διαφορές μεταξύ τους. Στην εικόνα διαφορών απεικονίζεται ιδιαίτερα χρήσιμη πληροφορία για τους ειδικούς όπως για παράδειγμα η μέτρηση της οστικής υποστήριξης προς τα εμφυτεύματα. Η ανάγκη για ευθυγράμμιση των εικόνων προκύπτει από τη χωρική μετατόπιση μεταξύ των εικόνων, η οποία συνήθως οφείλεται σε κινήσεις των ασθενών, σε ακούσιες κινήσεις του σώματος (π.χ. αναπνοή, καρδιακή λειτουργία), σε διατάξεις απεικονιστικών συστημάτων που δεν είναι σταθερές (π.χ. αισθητήρας CCD), καθώς και στην ανάπτυξη ανωμαλιών που προκαλούν παραμορφώσεις (π.χ. κύστες, όγκοι).
Η προτεινόμενη μέθοδος βασίζεται σε ζεύγη αντίστοιχων σημείων αλλά προϋποθέτει εύρεση χαρακτηριστικών σημείων μόνο στη μια από τις δύο εικόνες. Η εύρεση των αντιστοίχων σημείων στην εικόνα προς ευθυγράμμιση γίνεται αυτόματα και βάσει των ζευγαριών σημείων που προκύπτουν υπολογίζονται απευθείας οι παράμετροι του μετασχηματισμού με προσέγγιση ελαχίστων τετραγώνων. Εφαρμόζοντας το μετασχηματισμό στην εικόνα προς ευθυγράμμιση παίρνουμε την επιθυμητή ευθυγραμμισμένη εικόνα.Subject of this diploma thesis is the presentation of a method for automatic registration of 3D medical images. The task of registration is to eliminate spatial differences between two images allowing matching anatomical regions to coincide.
Image registration can be used in digital subtraction radiography employed by dentists to monitor and evaluate therapeutic procedures. Radiographs of the same object are acquired by experts over a period of time and are subtracted to produce a difference image. This image records changes in the bone structure supporting the teeth or implants. However, the differences between these images may not only be due to clinically significant changes, but are also very often the result of differences in the patient’s position, acquisition from different viewpoints or employment of different sensors. These spatial misalignments comprise the need for registration before subtraction.
The proposed method automatically extracts the most distinctive points from the reference image and searches for their corresponding points in the second image. Based on these points pairs, least squares approximation is employed to calculate an optimal affine transformation that aligns the two images.Πόλυς Ν. Γεωργίο
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