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Design of a high performance triple-mode oscillator
Published in Lin Liu, Automotive, Mechanical and Electrical Engineering, 2017
Zhuo Li, Suge Yue, Yantu Mo, Jia Wang, Fei Chu
In this paper, a high-precision, great stability triplemode oscillator is proposed for a DC-DC converter. The oscillator is designed in a simple ring structure. The oscillator frequency is regulated by an adjustable current which is used to charge the capacitance. According to the simulation results, the oscillator be switched into three modes. In the master mode, the scope of the output frequency is 485.9 KHz−512 KHz during a temperature of −55°C−125°C with a maximum offset of 2.82%. In resistance adjustment mode, the frequency can be regulated from 13.4 KHz to 2.78 MHz. In the synchronisation mode, the external frequency can cover from 15 KHz to 4.2 MHz. The features of the circuit totally satisfy the demands of the DC-DC converter which have also been successfully applied in a DC-DC converter chip.
Data Link/Network
Published in Paul J. Fortier, Handbook of Local Area Network Software, 1991
The difference in LAN environments versus wide area or metropolitan area networks in terms of routing is simplicity. LAN routing schemes typically are built into the design by media topology choice. That is, the LAN topology drives the need for routing algorithms. For example, the bus topology of an Ethernet-type LAN has a routing scheme called “broadcast” or “flooding” in ARPAnet terms. The sender simply broadcasts the message out with an address attached to it. As in flooding, all units hear it; the one with the matching address takes it off the LAN for use. The others listen, but do not copy it. Another example of topology determining routing is the simple ring. The ring topology by design forces the sender to always send out (route) a message using the single-output link. There is no other means to send messages out utilizing this topology. The need for true routing algorithms arises in those topologies where multiple media are used (e.g., dual ring, dual bus), or when multiple networks are connected (via bridges or gateways). In those cases, the LAN must utilize a scheme to route the messages over to the appropriate LAN and ultimately the destination node.
Application of Analogue Protection Devices
Published in Helmut Ungrad, Wilibald Winkler, Andrzej Wiszniewski, Peter G. Harrison, Protection Techniques in Electrical Energy Systems, 2020
Helmut Ungrad, Wilibald Winkler, Andrzej Wiszniewski, Peter G. Harrison
Directional time-overcurrent devices must also be installed at certain points on a ring line to maintain discrimination for all faults. It must be emphasised, however, that this kind of protection is only suitable for ring lines with a single infeed. At which points directional and non-directional units are installed depends on the configuration of the power system and the time delays of the individual devices. The procedure is explained with reference to the simple ring system of Fig. 6.8a.
New cross-coupled resonator induced shifted absorption (CRISA) in double microring resonators using a cross-coupling-structure technique
Published in Journal of Modern Optics, 2022
Coupled resonators can be implemented using different platforms such as: microring resonators (MRRs) [19,20], photonic crystal cavities [21], gallery whispering modes [22], plasmonic [23], optomechanics [24,25], and others. In particular, MRR-based double resonator configuration is attractive because of its simple structure, superior performance, ease of control, and amenable to integrated optical chip fabrication. It consists of two serially connected direct-coupled microring resonators (DC-MRRs) [2,3,10–13] where one of the two MRRs is coupled to a bus waveguide as shown in Figure 1(a). We will refer to this configuration as standard double resonator (SDR). It is generally considered as a ‘base architecture’ to compare and other configurations that exhibit all-optical analogues of quantum coherence effects (i.e. CRIT, CRIA and ATS) because of its overall simple ring structure.
A circularly polarised monopole antenna with switchable frequency, pattern and polarisation
Published in International Journal of Electronics, 2022
Ankit Bhattacharjee, Santanu Dwari
On the other hand, from the application point of view, monopole antenna has been a good choice because of its various advantages like simplicity in design, easy understandable mechanism, straightforward way of achieving narrow band, multiband and also wide band performances, easy implementation on planar form, compact in size etc. So, reconfigurable techniques have also been applied to different monopole configurations to modify various antenna parameters electronically in (Bhattacharjee et al., 2019; Boudaghi et al., 2012; Cao et al., 2015; Juan et al., 2017; Liang et al., 2015; Raman et al., 2013; Shi et al., 2012; A. Singh et al., 2019). Frequency reconfiguration is achieved with the help of a circular monopole antenna with PIN diode based switchable slotted ground plane in Boudaghi et al. (2012) and a monopole with water filled substrate milled channels in A. Singh et al. (2019). Switchable parasitic elements based designs are introduced in Juan et al. 2017) and Shi et al. (2012) for controlling the radiation beam from a driven monopole. Reconfigurable operation for circular polarisations are done in Bhattacharjee et al. (2019) and Cao et al. (2015) with the simple ring monopole and meandered monopole respectively. However, all the reported works in Bhattacharjee et al. (2019); Boudaghi et al. (2012); Cao et al. (2015); Juan et al. (2017); Shi et al. (2012); A. Singh et al. (2019) are based on single parameter reconfiguration, reconfigurable mechanism is complex in A. Singh et al. (2019) and Cao et al. (2015), and configurations are not planar in Juan et al. (2017) and Shi et al. (2012).
Wearable accessory designers’ perceptions using 3D printing technology
Published in International Journal of Fashion Design, Technology and Education, 2022
When asked what the easiest 3DP design was to make (Q6a), many accessory designers stated that it was a ring due to its geometric shape. For instance, designers stated the ‘easiest [design] is a simple ring, it’s like a simple ring, like a band, because all it is, is a circle’ [P4], ‘The easiest was just a ring, as simple ring, so that’s just a circle or a donut, if you like. That’s the easiest thing to print or to imagine’ [P8], ‘The ring was the easiest. It’s this cylinder. You know, it’s just geometric shapes like a men’s, like a band. That was definitely the easiest’ [P14], ‘a perfectly circular band’ [P11], and ‘the easiest, just a ring, just a simple band … a tube’. [P12] Another predominate accessory mentioned as easy to design was earrings as designers stated ‘little earrings … they’re quite easy’ [P5] and ‘earrings … it’s a very small item’. [P10]