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Pei Huang, Yuanqing Li, Xiao-Guang Yu, Wei-Bin Zhu, Shu-Yan Nie, Hao Zhang, Jin-Rui Liu, Ning Hu, Shao-Yun Fu
The mimicry of human skin to detect both oncoming and physical-contacting object is of great importance in the fields of manufacturing, artificial robots and vehicles, etc. Herein, a novel bio-inspired flexible and highly responsive dual-mode strain/magnetism composite sensor which works via both contact and contactless modes, is first fabricated by incorporating Fe3O4/silicone system into a carbon fiber aerogel. The distance-dependence of magnetic field endorses the CFA/Fe3O4/silicone composite possible for spatial sensing due to the introduction of Fe3O4 magnetic nanoparticles...
March 15, 2018: ACS Applied Materials & Interfaces
Jingxin Zhang, Eike Langbehn, Dennis Krupke, Nicholas Katzakis, Frank Steinicke
Telepresence systems have the potential to overcome limits and distance constraints of the real-world by enabling people to remotely visit and interact with each other. However, current telepresence systems usually lack natural ways of supporting interaction and exploration of remote environments (REs). In particular, single webcams for capturing the RE provide only a limited illusion of spatial presence, and movement control of mobile platforms in today's telepresence systems are often restricted to simple interaction devices...
April 2018: IEEE Transactions on Visualization and Computer Graphics
Bicheng Luo, Feng Xu, Christian Richardt, Jun-Hai Yong
We propose a novel 360° scene representation for converting real scenes into stereoscopic 3D virtual reality content with head-motion parallax. Our image-based scene representation enables efficient synthesis of novel views with six degrees-of-freedom (6-DoF) by fusing motion fields at two scales: (1) disparity motion fields carry implicit depth information and are robustly estimated from multiple laterally displaced auxiliary viewpoints, and (2) pairwise motion fields enable real-time flow-based blending, which improves the visual fidelity of results by minimizing ghosting and view transition artifacts...
April 2018: IEEE Transactions on Visualization and Computer Graphics
L Kumar, A Mehta, A Gudgeon
No abstract text is available yet for this article.
March 15, 2018: Annals of the Royal College of Surgeons of England
Qunfeng Cheng, Jingsong Peng
Nacre-inspired nanocomposites with excellent mechanical properties have achieved remarkable success in the past decades. The high performance of nacre-inspired nanocomposites lays down the basis for the further application of smart devices. Recently, some smart nanocomposites inspired by nacre have demonstrated well mechanical properties as well as effective and stable stimuli-responsive functions. In this concept, we summarize the recent development of smart nacre-inspired nanocomposites including 1D fibers, 2D films and 3D bulk nanocomposites in response to temperature, moisture, light, strain, etc...
March 15, 2018: Chemphyschem: a European Journal of Chemical Physics and Physical Chemistry
Andrea Moglia, Luca Morelli, Vincenzo Ferrari, Mauro Ferrari, Franco Mosca, Alfred Cuschieri
BACKGROUND: There is an increasing interest for a test assessing objectively the innate aptitude for surgery as a craft specialty to complement the current selection process of surgical residents. The aim of this study was to quantify the size of individuals with high, average, and low level of innate psychomotor skills among medical students. METHODS: A volunteer sample of 155 medical students, without prior experience with surgical simulator, executed five tasks at a virtual simulator for robot-assisted surgery...
March 14, 2018: Surgical Endoscopy
Anthony H Chau, Haidar Abdul-Muhsin, Xin Peng, Victor J Davila, Erik P Castle, Samuel R Money
Renal nutcracker syndrome is an anatomic anomaly characterized by the compression of the left renal vein between the superior mesenteric artery and the aorta or between the aorta and the vertebral body. Diagnosis is often challenging. Common presenting symptoms include hematuria, abdominal pain, and pelvic congestion. Several open and endovascular techniques have been described to treat this syndrome. We report a novel surgical technique with robotic-assisted left renal vein transposition to treat a 19-year-old woman with renal nutcracker syndrome...
March 2018: Journal of Vascular Surgery Cases and Innovative Techniques
Robyn Melanie Benz, Meritxell Alzamora Garcia, Felix Amsler, Johannes Voigt, Andreas Fieselmann, Anna Lucja Falkowski, Bram Stieltjes, Anna Hirschmann
Phantom-based initial performance assessment of a prototype three-dimensional (3-D) x-ray system and comparison of 3-D tomography with computed tomography (CT) were proposed. A 3-D image quality phantom was scanned with a prototype version of 3-D cone-beam CT imaging implemented on a twin robotic x-ray system using three trajectories (163 deg = table, 188 deg = upright, and 200 deg = side), six tube voltages (60, 70, 81, 90, 100, and 121 kV), and four detector doses (0.348, 0.696, 1.740, and [Formula: see text])...
January 2018: Journal of Medical Imaging
Paul D Marasco, Jacqueline S Hebert, Jon W Sensinger, Courtney E Shell, Jonathon S Schofield, Zachary C Thumser, Raviraj Nataraj, Dylan T Beckler, Michael R Dawson, Dan H Blustein, Satinder Gill, Brett D Mensh, Rafael Granja-Vazquez, Madeline D Newcomb, Jason P Carey, Beth M Orzell
To effortlessly complete an intentional movement, the brain needs feedback from the body regarding the movement's progress. This largely nonconscious kinesthetic sense helps the brain to learn relationships between motor commands and outcomes to correct movement errors. Prosthetic systems for restoring function have predominantly focused on controlling motorized joint movement. Without the kinesthetic sense, however, these devices do not become intuitively controllable. We report a method for endowing human amputees with a kinesthetic perception of dexterous robotic hands...
March 14, 2018: Science Translational Medicine
Keigo Nakamura, Tetsuya Hisanaga, Koichi Fujimoto, Keiji Nakajima, Hirofumi Wada
The female sex organ of the liverwort ( Marchantia polymorpha ) has a characteristic parasol-like form highly suitable for collecting water droplets containing sperm for fertilization. Motivated by this observation and using three-dimensional printing techniques, we develop a parasol-like rigid object that can grab, transport and release water droplets of a maximum size of about 1 cm. By combining experiments and scaling theory, we quantify the object's fundamental wetting and fluid dynamical properties. We construct a stability phase diagram and suggest that it is largely insensitive to properties of liquids such as surface tension and viscosity...
March 2018: Journal of the Royal Society, Interface
Aylin Aydın Sayılan, Ayfer Özbaş
The aim of the current study was to determine the effect of pelvic floor muscle exercises (PFME/Kegel) training administered to patients scheduled for robot-assisted radical prostatectomy on postprocedural incontinence problems. This study was a randomized controlled trial. Pelvic floor muscle exercises were applied to the procedure group three times a day for 6 months. No exercises were applied to the control group. Incontinence and quality-of-life assessments of the 60 patients in the experimental and control groups were performed on months 0 (10 days after removal of the urinary catheter), 1, 3, and 6 through face-to-face and telephone interviews...
March 1, 2018: American Journal of Men's Health
Julie A Reisz, Alexander S Barrett, Travis Nemkov, Kirk C Hansen, Angelo D'Alessandro
Proteins have been historically regarded as "nature's robots": Molecular machines that are essential to cellular/extracellular physical mechanical properties and catalyze key reactions for cell/system viability. However, these robots are kept in check by other protein-based machinery to preserve proteome integrity and stability. During aging, protein homeostasis is challenged by oxidation, decreased synthesis, and increasingly inefficient mechanisms responsible for repairing or degrading damaged proteins...
March 14, 2018: Expert Review of Proteomics
Douglas A Canning
No abstract text is available yet for this article.
May 2017: Journal of Urology
Jeffrey A Cadeddu
No abstract text is available yet for this article.
May 2017: Journal of Urology
Marco Vito Marino, Galyna Shabat, Domenico Guarrasi, Gaspare Gulotta, Andrzej Lech Komorowski
BACKGROUND: Despite potential benefits of robotic liver surgery, it is still considered a "development in progress" technique. METHODS: The outcomes of 14 patients undergoing robotic right hepatectomy were analyzed and compared with the results of 20 laparoscopic right hepatectomies consecutively performed by the same young surgeon. RESULTS: The overall mean operative time was less in robotic arm (425 ± 139 vs. 565.18 ± 183.73, p = 0...
March 14, 2018: Digestive Surgery
Stephan Handschuh-Wang, Yuzhen Chen, Lifei Zhu, Xuechang Zhou
Room-temperature gallium-based liquid metals (e.g., Galinstan) are one of the emerging materials for a wide range of applications spanning from soft robotics to a medium for running chemical reactions. However, Galinstan suffers from rapid oxide formation at the surface limiting its application. Similarly, this surface oxidation renders it difficult to determine the surface free energy of Galinstan. Herein, the interfacial properties of Galinstan in contact with argon, acid, base, water, and organic solvents were investigated, yielding kinetic information of the removal by acids and bases, the knowledge of oxo-hydroxide/hydroxide species at the interface Galinstan/water and the estimated value of the dispersive contribution of the surface free energy...
March 14, 2018: Chemphyschem: a European Journal of Chemical Physics and Physical Chemistry
H-Y Deng, W-X Huang, G Li, S-X Li, J Luo, G Alai, Y Wang, L-X Liu, Y-D Lin
Whether the robot-assisted minimally invasive esophagectomy (RAMIE) has any advantages over the video-assisted minimally invasive esophagectomy (VAMIE) remains controversial. In this study, we tried to compare the short-term outcomes of RAMIE with that of VAMIE in treating middle thoracic esophageal cancer from a single medical center. Consecutive patients undergoing RAMIE or VAMIE for middle thoracic esophageal cancer from April 2016 to April 2017 were prospectively included for analysis. Baseline data and pathological findings as well as short-term outcomes of these two group (RAMIE group and VAMIE group) patients were collected and compared...
March 9, 2018: Diseases of the Esophagus: Official Journal of the International Society for Diseases of the Esophagus
Fabio Giardina, Fumiya Iida
Locomotion of machines and robots operating in rough terrain is strongly influenced by the mechanics of the ground-machine interactions. A rolling wheel in terrain with obstacles is subject to collisional energy losses, which is governed by mechanics comparable to hopping or walking locomotion. Here we investigate the energetic cost associated with overcoming an obstacle for rolling and hopping locomotion, using a simple mechanics model. The model considers collision-based interactions with the ground and the obstacle, without frictional losses, and we quantify, analyse, and compare the sources of energetic costs for three locomotion strategies...
2018: PloS One
Vikas Patel
No abstract text is available yet for this article.
April 1, 2018: Spine
Rakesh Patel
No abstract text is available yet for this article.
April 1, 2018: Spine
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