Results 91 to 100 of about 8,614,380 (320)

A new epidemic model of sexually transmittable diseases: a fractional numerical approach

Scientific Reports
This study aims at investigating the dynamics of sexually transmitted infectious disease (STID), which is serious health concern. In so doing, the integer order STID model is progressed in to the time-delayed non-integer order STID model by introducing ...
Mudassar Rafique, Muhammad Aziz Ur Rehamn, Aisha M. Alqahtani, Muhammad Rafiq, A. F. Aljohani, Zafar Iqbal, Nauman Ahmed, Shafiullah Niazai, Ilyas Khan   +8 more
doaj   +1 more source

Exact Solutions for the Sharma–Tasso–Olver Equation via the Sardar Subequation Method with a Comparison between Atangana Space–Time Beta-Derivatives and Classical Derivatives

Mathematics
The Sharma–Tasso–Olver (STO) equation is a nonlinear, double-dispersive, partial differential equation that is physically important because it provides insights into the behavior of nonlinear waves and solitons in various physical areas, including fluid ...
Chanidaporn Pleumpreedaporn, Elvin J. Moore, Sekson Sirisubtawee, Nattawut Khansai, Songkran Pleumpreedaporn   +4 more
doaj   +1 more source

Chameleonic Color‐Variable Microbead Emitters for Multilevel Spectroscopic Encryption from Visible to Infrared Wavelengths

Advanced Optical Materials, EarlyView.
Whispering‐gallery‐mode microresonators with sharp resonant peaks enable photonic barcoding. Similar to a chameleon, a rare‐earth‐free microcavity with π‐conjugated PAHs enables visibleto‐near infrared color generation from a single microbead. The unique resonat emission (spectral barcode) can be dynamically transformed via excitation wavelength change,
Barun Kumar Barman, Keisuke Watanabe, Kenzo Deguchi, Shinobu Ohki, Kenjiro Hashi, Atsushi Goto, Tadaaki Nagao   +6 more
wiley   +1 more source

Sharp bounds on the number of solutions of $X^{2}-\left( a^{2}+b^{2} \right) Y^{4}=-b^{2}$

, 2018
We generalise and improve a result of Stoll, Walsh and Yuan by showing that there are at most two solutions in coprime positive integers of the equation in the title when $b=p^{m}$ where $m$ is a non-negative integer, $p$ is prime, $(a,p)=1$, $a^{2}+p ...
Voutier, Paul M
core  

The Hyperbolic Heisenberg and Sigma Models in (1+1)-dimensions

, 1998
Hyperbolic versions of the integrable (1+1)-dimensional Heisenberg Ferromagnet and sigma models are discussed in the context of topological solutions classifiable by an integer `winding number'.
A. E. Winn, A. Kundu, A. Kundu, D. Lambert, H. Eichenherr, H. J. Vega de, J. H. Lee, J. P. Antoine, J. Tjon, L. A. Takhtadzhyan, L. A. Takhtajan, P. F. Drazin, P. O. Mazur, R. S. Ward   +13 more
core   +3 more sources

Phototunable Polarization Volume Gratings Driven by Chiral Hydrazone Switches

Advanced Optical Materials, EarlyView.
Chiral hydrazone photoswitches incorporated into polarization volume gratings enable light‐driven, reversible modulation of optical properties. UV and blue light irradiation reversibly alter the hydrazone isomer ratio, leading to tunable diffraction efficiency and spectral response across the visible spectrum.
Artem Boichuk, Lauri Uosukainen, Indu Bala, Ivan Aprahamian, Arri Priimagi   +4 more
wiley   +1 more source

Exact solutions of time-delay integer- and fractional-order advection equations

Results in Applied Mathematics
Transport phenomena play a vital role in various fields of science and engineering. In this work, exact solutions are derived for advection equations with integer- and fractional-order time derivatives and a constant time-delay in the spatial derivative.
C.N. Angstmann, S.-J.M. Burney, D.S. Han, B.I. Henry, Z. Xu   +4 more
doaj   +1 more source

Fractional View Analysis of Third Order Kortewege-De Vries Equations, Using a New Analytical Technique

Frontiers in Physics, 2020
In the present article, fractional view of third order Kortewege-De Vries equations is presented by a sophisticated analytical technique called Mohand decomposition method.
Rasool Shah, Umar Farooq, Hassan Khan, Dumitru Baleanu, Dumitru Baleanu, Poom Kumam, Poom Kumam, Muhammad Arif   +7 more
doaj   +1 more source

Schr\"odinger Deformations of AdS_3 x S^3

, 2011
We study Schr\"odinger invariant deformations of the AdS_3 x S^3 x T^4 (or K3) solution of IIB supergravity and find a large class of solutions with integer and half-integer dynamical exponents.
A Adams, A Donos, A Donos, A Donos, A Polishchuk, Balt C. van Rees, CP Herzog, D Israel, D Orlando, D Orlando, DT Son, J Maldacena, JB Gutowski, JH Schwarz, JP Gauntlett, JR David, K Balasubramanian, K Skenderis, L Mazzucato, M Guica, M Sakaguchi, N Banerjee, N Bobev, N Bobev, Nikolay Bobev, P Kraus, RN Caldeira Costa, S Deger, S Schäfer-Nameki, SA Hartnoll, Y Nishida   +30 more
core   +1 more source

Continuum Mechanics Modeling of Flexible Spring Joints in Surgical Robots

Advanced Robotics Research, EarlyView.
A new mechanical model of a tendon‐actuated helical extension spring joint in surgical robots is built using Cosserat rod theory. The model can implicitly handle the unknown contacts between adjacent coils and numerically predict spring shapes from straight to significantly bent under actuation forces.
Botian Sun, Liang Zhang, Jianwen Zeng, Xuefeng Wang   +3 more
wiley   +1 more source