19 papers · ranked by Valyu relevance
Jae‐Youn Keum, Jeong Hee Yoon, Michael Garwood, Jang‐Yeon Park
5## DISCUSSION In this work, we proposed a flow-suppressed 2D spin-echo sequence and a spin-echo EPI sequence using HS pulses for both π/2 excitation and π refocusing. The proposed sequences were not only effective in suppressing blood flow but also could provide a degree of insensitivity to B1 inhomogeneity by using π…
Koji Hashimoto, Makoto Harada, Yosuke Yamada, Taro Kanno + 3 more
'Yutaka Kanno' 'Yuji Kamijo' 'Maurizio Bossola'] Vascular access (VA) flow suppression surgery augments VA flow resistance and can increase other circulation flows hindered by high-flow VA. However, whether VA flow suppression surgery affects cervical circulation has rarely been reported. We aimed to determine the…
Markus Henningsson, Shaihan Malik, Rene Botnar, Daniel Castellanos + 2 more
MAGNETIC RESONANCE IMAGING (MRI) allows high-resolution tomographic imaging with excellent soft tissue contrast. The MRI contrast mechanism can be related to magnetic properties (eg, longitudinal relaxation time-T1, and transverse relaxation time-T2) or physiological properties (eg, microscopic water diffusion…
Yiyang Sun, Maziar S. Hemati
For channel flow at subcritical Reynolds numbers (Re < 5772), a laminar-to-turbulent transition can emerge due to a large transient amplification in the kinetic energy of small perturbations, resulting in an increase in drag at the walls. The objectives of the present study are three-fold: (1) to study the nonlinear…
Alok Mishra, Ashoke De
The present article aims to study the suppression of vortex shedding using a passive flow control technique (slit through a circular cylinder) in the laminar regime (Re=100-500). The slit width ratio S/D (slit width/diameter) on the modified cylinder plays an essential role to control the vortex shedding. The…
Aimee M. Torres Rojas, Alejandro Meza Romero, Ignacio Pagonabarraga, Rui D.M. Travasso + 1 more
We relate vascular network structure to hemodynamics after vessel obstructions. We consider tree-like networks with a viscoelastic fluid with the rheological characteristics of blood. We analyze the network hemodynamic response, which is a function of the frequencies involved in the driving, and a measurement of the…
Matthias P. Baumann, Saad Idrees, Thomas A Münch, Ziad M. Hafed
Across saccades, perceptual detectability of brief visual stimuli is strongly diminished. We recently observed that this perceptual suppression phenomenon is jumpstarted in the retina, suggesting that the phenomenon might be significantly more visual in nature than normally acknowledged. Here, we explicitly compared…
Alexandros Mallios, Antoine Gaudin, Alexandra Hauguel, Romain de Blic + 2 more
'Romain de Blic' 'Benoit Boura' 'William C. Jennings'] We performed a single-center retrospective study of prospectively collected data for all patients who had flow reduction surgery with FRAME FR between November 2020 and January 2021. Ten patients had arteriovenous fistula flow reduction surgery with this technique.…
Nicole E. Peltier, Akiyuki Anzai, Ruben Moreno-Bote, Gregory C. DeAngelis
For the brain to compute object motion in the world during self-motion, it must discount the global patterns of image motion (optic flow) caused by self-motion. Optic flow parsing is a proposed visual mechanism for computing object motion in the world, and studies in both humans and monkeys have demonstrated perceptual…
Javier Abello, Yvette Y. Yien, Amber N. Stratman
Endothelial cells (ECs) are the primary cellular constituent of blood vessels that are in direct contact with hemodynamic forces over the course of a lifetime. Throughout the body, vessels experience different types of blood flow patterns and rates that alter vascular architecture and cellular behavior. Because of the…
Junnosuke Okajima, Taku Hanyuda, Yuka Iga
The thermodynamic suppression effect of cavitation generally appears in cryogenic cavitating flows. Temperature depression, which is the temperature difference between the mainstream and inside the cavity, indicates the thermodynamic suppression effect. In this study, a temperature depression model is developed to…
Authors not listed
The present study investigates the transient 3D numerical prediction of the significance of passive control techniques, using triangular and rectangular span-wise pimples, placed at cambered section at the location 32% chord length from of the nose of the hydrofoil, and combined with a modified finite trailing edge…
Huaijin Yao, Yiyang Sun, Talha Mushtaq, Maziar S. Hemati
Transient energy growth of flow perturbations is an important mechanism for laminar-toturbulent transition that can be mitigated with feedback control. Linear quadratic optimal control strategies have shown some success in reducing transient energy growth and suppressing transition, but acceptable worst-case…
Hongyun Xie, Qizhi Duan, Jialin Ping, Chao Lu + 2 more
'Shuqiang Li'] Small modular reactors (SMR) have an exceptionally wide range of applications due to their flexibility. But the reactivity of SMR is more susceptible to disturbance than that of large commercial reactors, which may cause the core power to deviate from the set value, and the limited internal space makes…
Olukayode Majekodunmi, Sara Hashmi
In suspension flows through microchannels with parallel walls, rigid particles form clogs that grow continuously in the upstream direction. However, introducing a slight taper to channel walls leads to a qualitatively different clogging mechanism. Clogs of rigid particles do not grow continuously in these tapered…
Barrett Smith, Sara Hashmi
Polymer flows through pores, nozzles and other small channels govern engineered and naturally occurring dynamics in many processes, from 3D printing to oil recovery in the earth's subsurface to a wide variety of biological flows. The crosslinking of polymers can change their material properties dramatically, and it is…
Jie Yao, Xi Chen, Fazle Hussain
A composite drag control (CDC) combining the opposition (OC) and spanwise opposed wall-jet forcing (SOJF) methods is studied in a turbulent channel flow via direct numerical simulation of the incompressible Navier–Stokes equations. A maximum drag reduction of about 33% is obtained for CDC – much higher than that…
Brian Dincau, Connor Tang, Emilie Dressaire, Alban Sauret
Clogging is a common obstacle encountered during the transport of suspensions and represents a significant energy and material cost across applications, including water purification, irrigation, biopharmaceutical processing, and aquifer recharge. Pulsatile pressure-driven flows can help mitigate clogging when compared…
Mohanish K. Chandurkar, Nikhil Mittal, Shaina P. Royer-Weeden, Steven D. Lehmann + 2 more
Within the vascular system, endothelial cells (ECs) are exposed to fluid shear stress (FSS), a mechanical force exerted by blood flow that is critical for regulating cellular tension and maintaining vascular homeostasis. The way ECs react to FSS varies significantly; while high, laminar FSS supports vasodilation and…