The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
This paper reviews recent advances in high speed short reach optical interconnects for Datacom links from the perspective of Ethernet applications, fiber development and system experiments based on the multimode-VCSEL paradigm.
Magnetic nanoparticle (MNP) thermometry will be necessary for safe therapeutic implementation of magnetic nanoparticle hyperthermia, a developing cancer treatment. One realization of a MNP thermometer works by detecting harmonic signal (the fundamental f and 3f harmonics) generated by MNPs exposed to ac magnetic field. In this paper, we aim to measure accurately the harmonic signal in a MNP thermometer,...
This article aims to the problems that the particle swarm optimization (PSO) algorithm has slow convergence and easy to fall into local optimum, provides an improved adaptive particle swarm optimization algorithm based on Levy flight mechanism (LFAPSO). The long jumps of Levy flight will step out of the local optimum in the local search. The convergence speed and accuracy of the LFAPSO algorithm are...
To improve the mobility of locomotive devices on loose, sandy terrain, protrusions or convex patterns called lugs (i.e., grousers) are attached to the surface of a locomotive modulus. Following our previous study, in which the effects of angular speed, lug sinkage length, and soil cumulative deformation on lug-soil interaction forces during the fixed-axis rotational motion were experimentally confirmed,...
The importance of mobile robots for the nuclear disaster response has been realized after Fukushima Dai-ichi nuclear power plant accident. In this paper, we propose a tracked robot for rescue and search in nuclear environment. A gamma-ray irradiation test of the robot's control system is conducted, in order to evaluate the performance of the robot in nuclear environment. The parallel test method is...
Silicone-based soft pneumatic actuator (SPA) is one of the key interests in soft robotic research. Currently, most of the SPAs bear a similar one-dimensional rod-like shape, regardless of their design and fabrication. There are few prototypes of SPAs with two-dimensional initial shapes, however, they are basically the linear combination of several one-dimensional SPAs. This paper presents a new class...
The planar rimless wheel (PRW) is a classic and simple passive dynamic mechanism to simulate biped walking, different simplified PRW models have respective descriptions and limited applications. This paper focus on constructing the general PRW model, and analyzing the intrinsic and mathematical relation between different PRW models. Based that, the limit cycle of symmetric PRW and asymmetric PRW are...
Stator core of high speed high power permanent magnet machines can be segmented in the axial direction, so that air flow can be forced through the gap between the core segments in order to enhance the cooling condition. Extra end effect thus exists, which will be studied in this paper. First, a 3D FEA model of the stator segments with end windings is built to reveal the relationship between the segmentation...
In this manuscript, a novel transformable spherical robot for multi-mode locomotion is proposed. The robot has the spherical shell and an internal driving unit for spherical rolling, and also has a quadruped unit for walking. The robot can change the locomotion mode between spherical rolling mode and the quadruped walking mode to adapt to varied terrains. Moreover, the analysis and simulation of the...
Soft compliant gripping is a promising way to protect soft tissues from the grip damage caused by the high stress points in delicate surgical manipulation. In this paper, a new soft robotic gripper is designed to minimize the risk of soft tissues damage due to the over-gripping force generated by the conventional forceps. This new soft robotic gripper consists of a 3D-printed hook retractor shell,...
Multi-axis force and torque measurement play an increasingly important role in robot technology. The stiffness, which is related to the mechanical structure and elastic material, is not only one of the fundamental characteristics of the FT sensor, but also the basis to calculate the dynamical performance of the sensor. In this manuscript, one type of 3-RPS parallel sensor is described, then the corresponding...
This manuscript introduced the modularized structural design of a medium sized quadruped robot with desired compact and dexterous mobility. In detail, the ball screw transmission and the four-bar linkages mechanism were adopted to construct the quadruped robot, and then the relationship between the torque of the knee joint and the torque of the motor was modelled and analyzed. Moreover, the mechanical...
With the development of long life and high reliability satellite, the radiation resistance ability of aerospace components has been put forward higher requirements. If the radiation resistance ability of components doesn't satisfy the requirement, it will need to be hardened by radiation shielding. However, there is a great deal of redundancy in the radiation shield hardening method used in satellite...
The Single Event Upsets on deep submicron and nano devices are analyzed. The Single Event Upsets on 0.18μm Static Random Access Memory in space orbits are measured. The measurement results show that the Single Event Upset (SEU) rates of 0.18μm Static Random Access Memory (SRAM) in Low earth orbit (LEO) are about one order of magnitude higher than geosynchronous orbit (GEO). The proton and heavy ion...
Because of properties of high speed, high breakdown voltage, low leakage current and high temperature resistance, silicon carbide (SiC) power devices can be used as processing units in advanced space high-power power system and high temperature propulsion power. However, the single event gate-rupture and burn-out on silicon carbide (SiC) power devices is main problem in space application for its high...
Adoption of Cloud Computing is on the rise[1] and many datacenter operators adhere to strict energy efficiency guidelines[2]. In this paper a novel approach to scheduling in a Cloud Computing context is proposed. The algorithm Maxmin Fast Track (MXFT) revises the Max-min algorithm to better support smaller tasks with stricter Service Level Agreements (SLAs), which makes it more relevant to Cloud Computing...
We experimentally demonstrate, for the first time, link BERs under the KP4 FEC threshold at 42.5 Gbps over 550 m high bandwidth OM4 using single 850 nm VCSEL and at aggregated 212.5 Gbps over 300 m wideband multimode fiber using SWDM TOSAs from 850 to 940 nm, employing a newly developed PAM4 chipset and direct detection, with a novel Ge/Si APD or wideband PIN ROSA.
We demonstrate 100 Gbps PAM-4 transmission over 105m of wideband-MMF for each of four wavelengths from 850nm to 940nm using 25G VCSELs and thereby demonstrate an architecture that enables 400G over a single MMF.
Astrophysicists rely on crowd sourced initiatives to classify galaxies in large surveys. The next generation of telescopes will lead to a revolutionary increase in the amount of unlabelled data available to astrophysicists making crowd sourcing infeasible. To cope with this significant increase in data astrophysicists will need unsupervised techniques. In this paper we show that a model using unsupervised...
An overlay structure broadband CPW coupler has been realized at millimeter-wave frequency and the size is only one third of the Lange coupler with same performance. It was used to construct a BPSK modulator employing balanced reflection topology with HBTs acting as switches. The modulator showed ±0.2dB amplitude imbalance and ±2° phase error over 26.5∼30.5GHz.
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.