Results 111 to 120 of about 17,701 (214)

A Quiet Helicopter for Air Taxi Operations [PDF]

NASA is exploring rotorcraft designs for VTOL air taxi operations, also known as urban air mobility (UAM) or on-demand mobility (ODM) applications. Several concept vehicles have been developed, intended to focus and guide NASA research activities in ...
Johnson, Wayne
core   +1 more source

Molar–Incisor and Generalized Grade C Periodontitis: Distinct Microbiome–Immune Interactions Suggest Divergent Pathogenesis

Journal of Periodontal Research, EarlyView.
Molar–Incisor (PerioC‐MIP) and Generalized (PerioC‐G) Grade C Periodontitis in systemically healthy patients exhibit different microbiological, inflammatory markers, and genomic signatures, as the analysis of subgingival content from North Americans with PerioC‐MIP and Brazilians with PerioC‐G (geographic preference of each respective phenotype ...
Camila S. Stolf, Hélvis E. S. Paz, Murilo C. Paraluppi, Manuela M. V. Miguel, Mauro P. Santamaria, Mabelle F. Monteiro, Deyvid E. Amgarten, Raquel R. A. Franco, Luciana S. Branco‐de‐Almeida, Luciana M. Shaddox, Renato C. V. Casarin   +10 more
wiley   +1 more source

In-flight friction and wear mechanism [PDF]

, 1975
A unique mechanism developed for conducting friction and wear experiments in orbit is described. The device is capable of testing twelve material samples simultaneously. Parameters considered critical include: power, weight, volume, mounting, cleanliness,
Devine, E. J., Evans, H. E.
core   +1 more source

What Does Intarsia Say? Materiality and Spirituality in the Urbino Studiolo☆

Renaissance Studies, EarlyView.
Abstract Upon entering the Urbino studiolo of Federico da Montefeltro, the visitor is struck by a material‐charged environment. Surprisingly, only a few scholars have addressed one prominent aspect of the decorative scheme, namely, the feature of intarsia as a medium. Even so, it remains on the sidelines of the discussion.
Matan Aviel
wiley   +1 more source

Stress Analysis of the Flexspline with Double- circular- arc Tooth Profile and Variable Structure

Jixie chuandong, 2015
The overall three- dimensional assembly models of harmonic gear drive with double- circular- arc tooth profile and elliptical wave generator is established,then,the finite element analysis of the assembly model is carried out.
Zhang Yushuang, Wang Jiaxu, Wang Zhengwei, Pu Wei, Li Junyang, Zhou Guangwu   +5 more
doaj  

An integrated platform for 2‐D and 3‐D optical and electrical mapping of arrhythmias in Langendorff‐perfused rabbit hearts

The Journal of Physiology, EarlyView.
Abstract figure legend Integrated multimodal platform for panoramic cardiac mapping in isolated heart experiments. On the left, an image of the experimental setup during data acquisition showing a Langendorff‐perfused rabbit heart surrounded by three optical cameras (CAM A, B and C) positioned 120° apart, each coupled with high‐power LEDs for panoramic
Jimena Siles, Vinícius Silva, Tainan Neves, Italo Sandoval, Angélica Quadros, Giovanni Weber, Óscar Barquero, Ilija Uzelac, João Salinet   +8 more
wiley   +1 more source

STUDY ON LOAD CAPACITY CHARACTERISTICS OF THE FLEXIBLE WHEEL IN RING PRECISION HARMONIC DRIVE

Jixie qiangdu, 2015
To study the deformation and stress of ring-flexspline in harmonic gear under actual working conditions,an interference fit model is applied to solve the problem of assembling between the wave generator and flexspline with large deformation. Further more
ZHAO ZhiXin, WANG FangCheng, CHEN Chun, LIU ErYue, NIU JianHua, HUANG Lan   +5 more
doaj  

Pointing/roll mechanism for the ultraviolet coronagraph spectrometer [PDF]

A pointing/roll mechanism for the Ultraviolet Coronagraph Spectrometer (UVCS) is presented along with a description of the mechanism control algorithm.
Guy, Larry J., Ostaszewski, Miroslaw A.
core   +1 more source

Timing Is Everything: How Subtle Timing Changes in MRI Echo Planar Imaging Can Significantly Alter Mechanical Vibrations and Sound Level

Magnetic Resonance in Medicine, Volume 95, Issue 6, Page 3116-3130, June 2026.
ABSTRACT Purpose Echo‐Planar Imaging (EPI) is central to fMRI, diffusion MRI, and many dynamic clinical applications, yet rapid gradient switching induces strong mechanical vibrations, generates acoustic noise, and contributes to ghosting artifacts—effects that intensify at ultra‐high fields.
Amir Seginer, Alexander Bratch, Shahar Goren, Edna Furman‐Haran, Noam Harel, Essa Yacoub, Rita Schmidt   +6 more
wiley   +1 more source

Design of the New Flex Wheel Tooth Profile for Harmonic Drive Based on Transient Dynamics

Jixie chuandong
In order to improve the transmission performance and meshing performance of harmonic gear drives, a new type of flexible gear tooth profile is designed on the basis of the comparison of the meshing backlash of different tooth profiles by analyzing the ...
Zheng Junjian, He Xueming, Li Pengchao
doaj