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Although resonant vibration in the ultrasonic frequency range is thought as a power-intensive way for actuation, its application to untethered miniature mobile robots is still challenging because of lacking the onboard circuit that produces the ultrasonic signals with modulatable frequencies, voltages, and phases. To tackle this problem, first, the ultrasonic transducers whose longitudinal/bending vibrations share a common node was made to steadily support other components. Second, an onboard circuit was designed to convert the battery’s DC signal into multi-channels of ultrasonic signals amplified in a multi-level manner. Third, these components were compactly integrated to developed an untethered ultrasonic robot (U2sonobot) with fast, flexible, and load-carriable movements. The prototype was 54 × 52 × 46 mm3 in size and 76.5 g in weight, and its moving/carrying performance was assessed. At 59.3 kHz frequency, it yielded the maximal speed of 221 mm/s and the minimal step displacement of 0.3 μm. According to the wirelessly-received commands, it produced the flexible movements (e.g., those with adjustable speed/steering-radii and in-situ rotations) and climbed 8.9° slope. Moreover, it carried the maximal payload of 520 g and provided the minimal cost of transport of 3.9. The optical focusing/scanning system is a candidate application area for U2sonobot.
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47 Views
In this work we present a study of micro-photoluminescence (PL) emission from a novel InGaN quantum well (QW) emitting structure with integrated micro-cavity, which can be used for VCSEL applications. The micro-cavity exhibiting Tamm plasmon optical states is formed by porous GaN distributed Bragg reflector (DBR) bottom mirror and top plasmonic silver metal mirror. Results of PL, Fourier imaging spectroscopy and finite-difference time-domain simulations are presented and discussed.
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78 Views
After considering the pervasiveness of same/different relationships in Psychology and the experimental evidence of their perceptual foundation in Psychophysics and Infant and Comparative Psychology, the paper develops its main argument. Similarity and diversity do not complete the panorama since opposition constitutes a third relationship which is distinct from the other two. There is evidence of this in previous literature investigating the perceptual basis of opposition and in the results of the two new studies presented in this paper.
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463 Views
A two-stage sampling method was employed for this study. In the first stage, five elderly care institutions in Tangshan Province were randomly selected from a pool of 70 institutions listed in the Notice of Hebei Provincial Department of Civil Affairs on the Grading Results of Elderly Care Institutions in January 2022. In the second stage, cluster sampling was conducted among the elderly residents within these five selected institutions.
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535 Views
Asaba specialist hospital website was originally designed by Enyi Francis in 2019 as a pro bono service in support of the Delta state government, and the hospital. It has since been handed over to the hospital's ICT department for management. The original resources used for the design of the website is stored in this data port for reference purposes. In the original version, various tools were used to accomplish the design.
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5 Views
Mobile App for firstaid procedure
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11 Views
Entanglement between quantum network nodes is often produced using intermediary devices
- such as heralding stations - as a resource. When scaling quantum networks to many nodes, requiring
a dedicated intermediary device for every pair of nodes introduces high costs. Here, we propose a cost-
effective architecture to connect many quantum network nodes via a central quantum network hub called
an Entanglement Generation Switch (EGS). The EGS allows multiple quantum nodes to be connected at a
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23 Views
This data set contains 120 text files describing the functional requirements written in natural language (English) for various software systems, such as educational, business, and hospitality settings. The dataset is ready for all text processing such as learning and extracting conceptual models.
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2380 Views
In Nigeria, access to proper medical services is not only costly but also not readily available. We are faced with different problems that require immediate attention (first-aid) to save life before we can get access to proper medical attention from professionals in hospitals and clinics which may be some miles away from our location at that instant. A lot of us do not know how to administer First-Aid in different circumstances that we find ourselves.
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15 Views
This paper introduces an assessment of mobile Internet of Things (IoT) devices embedded with Global Positioning Service (GPS) / Global Navigation Satellite System (GNSS) chip, envisioned to enhance positioning accuracy for safety and on-demand location aware user applications and architecture such as mobile payment applications. This paper extends previous works and proposes a detailed Hybrid assessment, coupling design and performance metrics of Global Navigation Satellite System (GNSS) mobile IoT receivers.
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77 Views