Results 21 to 30 of about 54,387 (315)

Mathematical Symbolism in Yann Martel’s Novel Life of Pi (2001) [PDF]

Литература двух Америк
The article identifies and investigates the semiotic and aesthetic nature of a specific type of artistic images, which can be called mathematical. In the theoretical part, based on known works of Russian and World literature, an analytical justification ...
Aleksei N. Nikulin
doaj   +1 more source

Effects of Toolpath Parameters on Engagement Angle and Cutting Force in Ellipse-Based Trochoidal Milling of Titanium Alloy Ti-6Al-4V

Applied Sciences, 2023
Trochoidal milling is an efficient strategy for the rough machining of difficult-to-cut materials. The true trochoidal toolpath has C2 continuity and avoids sharp changes in engagement angle and cutting load, resulting in smooth machine tool movement ...
Xu Zhou, Jinhua Zhou, Qi Qi, Congpeng Zhang, Dinghua Zhang   +4 more
doaj   +1 more source

L’auteur caché: Pérez de Oliva y la dignidad del hombre

E-Spania, 2018
Le premier éditeur du Diálogo de la dignidad del hombre de Fernán Pérez de Oliva, Cervantes de Salazar, a ajouté en 1546 une suite à ce qu'il considérait comme un texte incomplet. En 1586 Morales, neveu de l'auteur, rétablit le texte original.
Pedro Ruiz Pérez
doaj   +1 more source

Derivation of closed-form ellipsoidal X-ray mirror shapes from Fermat's principle

Journal of Synchrotron Radiation, 2022
Ellipsoidal and plane-elliptical surfaces are widely used as reflective, point-to-point focusing elements in many optical systems, including X-ray optics.
Kenneth A. Goldberg
doaj   +1 more source

Biomechanical Design and Validation of a Novel Elliptical Sleeve Pedicle Screw for Enhanced Spinal Fixation Stability

Bioengineering
This study aimed to develop a novel modular pedicle screw system incorporating an elliptical sleeve to conform the pedicle’s elliptical cross-section and enhance fixation strength with mechanical stability.
Ting-Shuo Hsu, Chang-Jung Chiang, Hsuan-Wen Wang, Yu-San Chen, Chun-Li Lin   +4 more
doaj   +1 more source

Research on vibration compensation mechanism of engine ellipse timing system and belt tension distribution at meshing points

Journal of Advanced Mechanical Design, Systems, and Manufacturing, 2021
Aiming at the problem of camshaft torsional oscillation caused by the torque of the engine camshaft spring, this paper carries out the research on the compensation of the elliptical pulley timing system for the torsional oscillation of the camshaft.
Jianhua GUO, Junpeng HOU, Zhenzhen HU, Guojun LIN, Rui FAN, Qingming HU   +5 more
doaj   +1 more source

Investigating the cell of origin and novel molecular targets in Merkel cell carcinoma: a historic misnomer

Molecular Oncology, EarlyView.
This study indicates that Merkel cell carcinoma (MCC) does not originate from Merkel cells, and identifies gene, protein & cellular expression of immune‐linked and neuroendocrine markers in primary and metastatic Merkel cell carcinoma (MCC) tumor samples, linked to Merkel cell polyomavirus (MCPyV) status, with enrichment of B‐cell and other immune cell
Richie Jeremian, Sriraam Sivachandran, Melissa Galati, Brandon Ramchatesingh, Hibo Rijal, Johnny Hanna, Elena Netchiporouk, May Chergui, Margaret Redpath, Samy Abou Setah, Ivan V. Litvinov   +10 more
wiley   +1 more source

Genetic attenuation of ALDH1A1 increases metastatic potential and aggressiveness in colorectal cancer

Molecular Oncology, EarlyView.
Aldehyde dehydrogenase 1A1 (ALDH1A1) is a cancer stem cell marker in several malignancies. We established a novel epithelial cell line from rectal adenocarcinoma with unique overexpression of this enzyme. Genetic attenuation of ALDH1A1 led to increased invasive capacity and metastatic potential, the inhibition of proliferation activity, and ultimately ...
Martina Poturnajova, Zuzana Kozovska, Ondrej Pos, Kristina Pavlov, Sachin Gulati, Peter Makovicky, Kristina Jakic, Monika Burikova, Eva Sedlackova, Barbora Svitkova, Silvia Tyciakova, Vojtech Bystry, Nicolas Blavet, Boris Tichy, Matej Hrnciar, Jaroslav Budis, Miroslav Tomas, Peter Dubovan, Georgina Kolnikova, Veronika Repaska, Nikoleta Mojzesova, Eva Zomborska, Daniel Pindak, Michal Mego, Tomas Szemes, Miroslava Matuskova   +25 more
wiley   +1 more source

Seed Geometry in the Arecaceae

Horticulturae, 2020
Fruit and seed shape are important characteristics in taxonomy providing information on ecological, nutritional, and developmental aspects, but their application requires quantification.
Diego Gutiérrez del Pozo, José Javier Martín-Gómez, Ángel Tocino, Emilio Cervantes   +3 more
doaj   +1 more source

DERIVING THE EXACT FORMULA FOR PERIMETER OF AN ELLIPSE USING COORDINATE TRANSFORMATION

Alifmatika, 2022
The ellipse can be transformed into a circle by dilating the coordinates of the ellipse relative to the x-axis and y-axis. Therefore, this study aimed to derive the formula for the equation of the perimeter of an ellipse by using the transformation of an
Harun Abdul Rohman
doaj   +1 more source