continuous working
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2020 ◽  
Vol 29 (15) ◽  
pp. 2050236
Author(s):  
Decheng Gan ◽  
Weimin Shi ◽  
Muhammad Furqan Haider

It has been widely validated that continuous working modes are powerful theories for designing broadband power amplifier (BPA). Theoretically, the conduction angle of all continuous-mode power amplifiers (PAs) is 180∘ (class-B-biased). However, in practice, these PAs are always biased in class-AB condition. Thus, continuous-mode PAs biased in class-AB condition should be researched. This paper generalizes the theory of hybrid continuous mode (HCM) for implementing broadband power amplifiers. The intrinsic drain current waveform of HCM biased above the pinch-off point (conduction angle is larger than 180∘) is first derived. Then, the impedance space of the generalized HCM (class-AB-biased) is explored and analyzed. The conclusion is that the generalized HCM possesses a shifted fundamental impedance space along with the enlargement of conduction angle. For validating the proposed theory, a broadband PA working over 1.6–3.0[Formula: see text]GHz is implemented. Experimental results indicate that the designed BPA achieves a saturation power of 40.3–42.7[Formula: see text]dBm and a drain efficiency of 64.3–74.4%.


2020 ◽  
Author(s):  
Junliang Chen ◽  
Yanning Dai ◽  
Shuo Gao

Gait is closely associated with many chronic diseases. With the development of the Internet of Health Things (IoHT), long-term gait monitoring and corresponding analysis can be performed remotely, reducing a patient’s time and traffic cost, while providing doctors more valuable gait information. The presented work provides a feasible means for real-time, long-term, and accurate gait monitoring in an IoHT scenario. Through the experimental results, the high detection sensitivity of 54 mN and responsivity of 163 mV/N are achieved, thereby satisfying the need for analyzing various diseases. Furthermore, 16 hours continuous working time indicates its successful utilization during long-term gait monitoring.


Author(s):  
Junliang Chen ◽  
Yanning Dai ◽  
Shuo Gao

Gait is closely associated with many chronic diseases. With the development of the Internet of Health Things (IoHT), long-term gait monitoring and corresponding analysis can be performed remotely, reducing a patient’s time and traffic cost, while providing doctors more valuable gait information. The presented work provides a feasible means for real-time, long-term, and accurate gait monitoring in an IoHT scenario. Through the experimental results, the high detection sensitivity of 54 mN and responsivity of 163 mV/N are achieved, thereby satisfying the need for analyzing various diseases. Furthermore, 16 hours continuous working time indicates its successful utilization during long-term gait monitoring.


Author(s):  
Ivan Sevostyanov ◽  
Anatoliy Hrytsun ◽  
Ihor Babyn ◽  
Sergei Chuiko

The paper proposes a highly efficient equipment for the preliminary mechanical treatment of wastewater from agricultural enterprises, ensuring a continuous working process, the necessary quality of cleaning with minimal energy expenditure. The equations for determining the basic operating parameters of the equipment are given: changes in the flow area, flow rates of water passing through the installation, the required power of the electric motors. Also presented are graphical dependencies calculated using the obtained equations.


2019 ◽  
Vol 10 (1) ◽  
pp. 15-20
Author(s):  
József András ◽  
József Kovács ◽  
Endre András ◽  
Ildikó Kertész ◽  
Ovidiu Bogdan Tomus

Abstract The bucket wheel excavator (BWE) is a continuous working rock harvesting device which removes the rock by means of buckets armoured with teeth, mounted on the wheel and which transfers rock on a main hauling system (generally a belt conveyor). The wheel rotates in a vertical plane and swings in the horizontal plane and raised / descended in the vertical plane by a boom. In this paper we propose a graphical-numerical method in order to calculate the power and energy requirements of the main harvesting structure (the bucket wheel) of the BWE. This approach - based on virtual models of the main working units of bucket wheel excavators and their working processes - is more convenient than those based on analytical formulas and simplification hypotheses, and leads to improved operation, reduced energy consumption, increased productivity and optimal use of available actuating power.


2019 ◽  
Vol 9 (1) ◽  
pp. 61-71 ◽  
Author(s):  
Timo Malm ◽  
Timo Salmi ◽  
Ilari Marstio ◽  
Jari Montonen

AbstractThere is an increasing need to have a safety system, which allows safe collaboration of operators and industrial robots. Industrial robots are powerful and therefore dangerous impacts and crashes need to be prevented by keeping safe distance between moving robot and the operator. Safe distance can be achieved by monitoring the position and speed of the robot and the position of the operator. Separation distance, speeds and performance of the control system, sensors and actuators are regulated by standards, which must be followed. VTT has developed a dynamic safety system, which monitors the speed and separation between persons and the robot in order to keep the stopping distance of the robot small enough to avoid impacts. The dynamic safety system enables safe continuous working beside the robot and automated restarting after a safety-rated monitored stop. An assistance system is applied to switch safety modes of the robot according to separation distance. Configuring and validating the safety system are safety-critical and time-consuming phases of design. Therefore, a configuration tool is required to get a coherent configuration, which support validation process.


2018 ◽  
Author(s):  
Ning Wang ◽  
Jiting Han ◽  
Haitian Sun ◽  
Jiwei Cheng ◽  
Ying’ai Jing ◽  
...  

Author(s):  
Sjoerd van Tuinen

In many ways, movement is a test case for visual art as much as for philosophy: for both, we have to answer the question of whether they create real movement or merely a representation of it. Does the event really take place or is it only an illusion? This is a problem that pertains especially to Mannerism and the baroque, which rely heavily on the vocabulary of force and movement that has invested the field of art since the Renaissance. Although these styles are still dominated by classical figuration, they also introduce all sorts of distortions, deformations, and exaggerations in it. Mannerism and the baroque are attempts, within representation, to present the unrepresentable and to render visible the invisible. As a consequence, stable form is no longer the foundation of the image, but rather the limit of visual evidency. Inseparable from its relation to the formless, extension itself becomes a delimitation of intensity, a participation in the infinite. Yet the question remains: Have these attempts merely produced sensational and metaphorical works of art that are meant to move us by generating an illusion of movement in what is undeniably a stable structure or a framed picture, or are they somehow literally moving in themselves? The second position is held by Gilles Deleuze. In Francis Bacon: The Logic of Sensation, he develops a deep connection between Bacon and Michelangelo, since Mannerist painting discovered the ‘figural’: the point at which abstract movements or forces are rendered visible within classical figuration such that the organic figurability of sensation is enriched with an inhuman becoming. In his The Fold: Leibniz and the Baroque, Deleuze then goes on to show how the baroque introduces movement in classical art by means of infinite folding, such that forms would emerge from and dissolve into folds: ‘[t]he object is manneristic, not essentializing: it becomes an event’. The first position, by contrast, is taken up by Lars Spuybroek in The Sympathy of Things: Ruskin and the Ecology of Design (2011), who contrasts Mannerism and the baroque with the Gothic, arguing that while the former work away from static form to deformation, only the latter directly imitates the vicissitude and variety of living nature and produces movement in its continuous working towards form. For no matter how much we deform the painted figure and render it dynamic, it remains imprisoned within a frame hanging motionless on a wall. And no matter how much we cover a classical structure with lifelike ornament, it remains a lifeless construction. Worse still, each time we produce an image or effect of movement in this way, our experience actually becomes more detached from real movement than attached to it. ‘The Baroque,’ Spuybroek therefore concludes, ‘is merely distorted classicism’. The proposition I put to the test is that, to a certain, to be determined extent, we should differentiate between Mannerism and the baroque in a way analogous to Spuybroek’s distinction between the Gothic and the baroque. For while the Mannerist fine arts certainly do not arrive at the free aggregation of lines of Gothic ornament, as they are based on the (dis)proportional variation of the single human body rather than on configural variation, they also lack, or do not yet succumb to, the continuity and smoothness of the baroque. Whereas the baroque brings all movement back to a spectacular sensuality and physicality, we still find a much more abstract, or inorganic, experience in Mannerism. It is that of the life of the serpentine line, or what William Hogarth would later call the ‘line of grace’.


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