Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Universal Wireless Power Transfer for Energy Security, Availability and
  Convenience   This article proposes a novel system concept named universal wireless power
transfer, in which power can be wirelessly transferred between different
entities (e.g. vehicles, robots, homes, grid facilities, consumer electronic
devices, etc.) equipped with proper energy transmitters and receivers, whether
stationary or in motion. This concept generalizes individually existing
wireless power transfer systems, where a specific wireless power transfer
technology is used, and where the wireless energy transmitter or receiver is
fixed. As a result, energy mobility, flexibility, and convenience are
significantly improved by the proposed universal wireless power transfer
concept in this study. Moreover, factors relevant to system energy efficiency
are analyzed according to each utilized wireless power transfer technology.
Necessary market mechanisms for such a concept to be successfully deployed are
also introduced, along with an analysis of the benefits engendered in terms of
improving energy systems, the environment, human comfort, and convenience.
Finally, a discussion of the proposed concept, policy implications and
recommendations for future research directions which will underpin universal
wireless power transfer systems are presented.

37
The categories of this paper are: supr-con
24
The categories of this paper are: dg-ga
6
The categories of this paper are: astro-ph
21
The categories of this paper are: adap-org
17
The categories of this paper are: q-fin
34
The categories of this paper are: chem-ph
16
The categories of this paper are: stat
25
The categories of this paper are: patt-sol
23
The categories of this paper are: solv-int
4
The categories of this paper are: cond-mat
10
The categories of this paper are: q-bio
36
The categories of this paper are: cmp-lg
27
The categories of this paper are: comp-gas
3
The categories of this paper are: physics
18
The categories of this paper are: econ
22
The categories of this paper are: chao-dyn