General Power Inequalities for Generalized Euclidean Operator Radius

2021 ◽  
Vol 15 (4) ◽  
pp. 497-502
Keyword(s):  
General Power

scholarly journals A special high-frequency soft-switched DC/DC power supply for GCT gate driver

2021 ◽  
Author(s):  
Jahangir Afsharian
Keyword(s):  
Power Supply ◽  
High Frequency ◽  
Optimization Procedure ◽  
Power Supplies ◽  
Zero Voltage Switching ◽  
General Power ◽  
Gate Driver ◽  
Isolation Transformer ◽  
Experimental Use ◽  
Gate Drivers

This thesis is devoted to the development of a novel parallel isolated power supply (PIPS) for the gate driver of integrated Gate Commutated Thyristors (GCT). The proposed PIPS is essentially a special high frequency soft switched DC/DC converter, integrating six parallel isolated power supplies in one module where each power supply generates a regulated dc supply for the GCT gate driver. In commercial GCT power supplies, a high-voltage isolation transformer is indispensable but highly inefficient in terms of cost and size, which can be significantly improved by the optimized transformer. In all, this design strives to achieve a general power supply for powering up the gate drivers of all types of GCT devices in all MV applications with minimal changes in configuration. In this thesis, the configuration of PIPS is presented and its operating principle is elaborated. The transformer optimization procedure satisfying the voltage isolation requirement of GCT gate drivers is extensively discussed. The performance of PIPS, including the front end DC/DC converter, zero voltage switching phase-shift full bridge (ZVS-PS-FB) converter, and the optimization of the transformer, is verified by simulations and experiments where a 360W laboratory prototype is built for the experimental use.

Service-based general power system data exchange mode

2017 ◽  
Author(s):  
Haifeng Huang ◽  
Hong Zhang ◽  
Xiaolu Li ◽  
Zhiqiang Yao ◽  
Fang Yu
Keyword(s):  
Power System ◽  
Data Exchange ◽  
General Power ◽  
System Data

Memory

2018 ◽  
Author(s):  
Maxwell Deutscher
Keyword(s):  
Memory Trace ◽  
Computer Models ◽  
Structural Analogue ◽  
Past Event ◽  
The Past ◽  
General Power ◽  
Ancillary Information ◽  
The Difference ◽  
Theoretical Question

Memory is central to every way in which we deal with things. One might subsume memory under the category of intellect, since it is our capacity to retain what we sense, enjoy and suffer, and thus to become knowing in our perception and other activities. As intelligent retention, memory cannot be distinguished from our acquisition of skills, habits and customs – our capabilities both for prudence and for deliberate risk. As retention, memory is a vital condition of the formation of language. Amnesia illustrates dramatically the difference between memory as retention of language and skills, and memory as the power to recollect and to recognize specific events and situations. In amnesia we lose, not our general power of retention, but rather our recall of facts – the prior events of our life, and our power to recognize people and places. Amnesiacs recognize kinds of things. They may know it is a wristwatch they are wearing, while unable to recognize it as their own. This recall of events and facts that enables us to recognize things as our own, is more than just the ability to give correctly an account of them. One might accurately describe some part of one’s past inadvertently, or after hypnosis, or by relying on incidental information. Thus, present research on memory both as retention and as recall of specific episodes, attempts to describe the connection which persists between experience and recall. Neurological or computer models of such a connection owe something to traditional notions of a memory trace, but emphasize also the re-tracing of original memories by later experience and episodes of recall. Historically, recollection has often been thought of as a mode of perceiving the past. Such an idea lends an exaggerated status to the role of imagery, which is but one member of a family of recollective activities that includes reliving, remembering, reminiscing and mulling over what has happened. It may be not in having imagery but in miming someone’s behaviour that one relives an event. Also, like imagery, what we feel about the past may seem integral to recollection. A sense of being brought close to the past arises particularly when events that involve our feelings are concerned. Yet we may also recollect an event, vividly and accurately, while feeling clinically detached from it, devoid of imagery. How a past event or situation remains connected with subsequent recollection has become a principal theoretical question about memory. It is argued that it is because of what we did or experienced that we recollect it. Otherwise, we are only imagining it or relying upon ancillary information. Neurological or computer models of such a connection owe something to traditional notions of a memory trace, but emphasize also the re-tracing of original memories by later experience and episodes of recall. Some argue that our very idea of memory is that of the retention of a structural analogue of what we do recall of them. Such an idea is not of some perfect harmony between what we remember and our recollection of it. Rather, it is suggested, only to the extent that we retain a structural analogue of some aspect of an event or situation do we remember, rather than imagine or infer it.

10. Transfer of title

2017 ◽  
Author(s):  
MA Clarke ◽  
RJA Hooley ◽  
RJC Munday ◽  
LS Sealy ◽  
AM Tettenborn ◽  
...  
Keyword(s):  
Motor Vehicle ◽  
Court Order ◽  
General Power

This chapter examines the transfer of title from the seller to the buyer. It first provides an overview of the rule nemo dat quod non habet (‘no-one can transfer what he does not himself have’) before discussing various exceptions to the rule, including estoppel, sale under the Factors Act 1889, sale under a voidable title, sale by seller continuing in possession, and sale by buyer in possession. Other exceptions to the nemo dat rule include sale by unpaid seller under s 48 of the Sale of Goods Act 1979, private purchase of motor vehicle held on hire-purchase, and sale under general power of sale or court order.

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