Lubrication has been proven to be an effective approach to drastically improve the efficiency of ultrasonic motors without losing the output torque. This phenomenon is attributed to the effective modulation of the friction force by lubricant, according to the theory described in the Stribeck curve. Previous findings even show a potential to increase the motor output torque with lubrication. Here,

Ultrasonic motors have hit a bottleneck caused by low efficiency and short life, which limits their applications to some niche areas. We believe that lubrication is a promising candidate to solve these problems. In this paper, we clarify, both analytically and experimentally, that the performance of the hybrid transducer-type ultrasonic motor (HTUSM), including the transduction efficiency, can be

Ultrasonic motors (USMs) have been extensively studied for three decades, due to their attractive features, such as high torque at low speed, simple structure, and precise positioning capability. However, since USMs are driven by the friction force between the rotor and the stator in most cases, they inherently possess the friction loss and the wear of contact materials, which cause their low effi

Background and purpose: The treatment of biochemical recurrence (BCR) after prostatectomy is challenging as the site of the recurrence is often undetectable. Our aim was to test a personalised treatment concept for BCR based on PSA kinetics during salvage radiotherapy (SRT) combined with prostate-specific membrane antigen positron emission tomography (PSMA-PET).Materials and methods: This phase II

During the period 1920--30, there was a certain interest in north-westem Argentina's ar­chaeology and ethnography at Etnografiska Museet. This interest had its roots in the so ­called "Expedition Chaco-Cordillera" led by Erland Nordenskiöld in 1901-1902. In 1932, Alfred Metraux visited Etnografiska Museet and inspired, among others, Stig Ryden, one of Erland Nordenskiöld's students. In the same ye

How does delay in the realization of a prosocial decision affect prosocial choice? This paper first provides a meta-analysis that collects existing evidence on the temporal consistency of prosocial behavior. I show that the evidence on the delay effect on prosocial choice is contradicting but appears reconcilable by a moderating factor: repeated interaction. Motivated by this finding, I conduct an

PURPOSE: The overall aim of this study was to describe experiences of discrimination due to inaccessibility among people using mobility devices.MATERIAL AND METHODS: We conducted a thematic qualitative analysis of 88 complaints about wheeled mobility device use, inaccessibility, and discrimination submitted to the Swedish Equality Ombudsman (DO) during 2015 and 2016.RESULTS: The analysis resulted