2,700 research outputs found
Space Charge Modelling in Solid Dielectrics under High Electric Field Based on Double Charge Injection Model
Present study aims to develop a clear insight on factors that influence space charge dynamics in solid dielectrics through a numerical simulation. The model used for the simulation is proposed by Alison and Hill [1] which describes charge dynamics as a result of bipolar transport with single level trapping. In this model, a constant mobility and no detrapping have been assumed. The simulation results show that carrier mobility, trapping coefficient and Schottky barrier have a significant effect on the space charge dynamics. Many features of space charge profiles observed by experiments have been revealed in despite of over simplistic model. More importantly, the simulation allows us to study the role of each individual parameter in the formation of space charge in solid dielectrics, so that the experimental results can be better understood
Balanced metrics on homogeneous vector bundles
Let be a holomorphic vector bundle over a compact Kaehler
manifold and let be its
decomposition into irreducible factors. Suppose that each admits a
-balanced metric in Donaldson-Wang terminology. In this paper we prove
that admits a unique -balanced metric if and only if
for all , where denotes
the rank of and . We apply our result to the case
of homogeneous vector bundles over a rational homogeneous variety
and we show the existence and rigidity of balanced Kaehler embedding from into Grassmannians.Comment: 5 page
The bisymplectomorphism group of a bounded symmetric domain
An Hermitian bounded symmetric domain in a complex vector space, given in its
circled realization, is endowed with two natural symplectic forms: the flat
form and the hyperbolic form. In a similar way, the ambient vector space is
also endowed with two natural symplectic forms: the Fubini-Study form and the
flat form. It has been shown in arXiv:math.DG/0603141 that there exists a
diffeomorphism from the domain to the ambient vector space which puts in
correspondence the above pair of forms. This phenomenon is called symplectic
duality for Hermitian non compact symmetric spaces.
In this article, we first give a different and simpler proof of this fact.
Then, in order to measure the non uniqueness of this symplectic duality map, we
determine the group of bisymplectomorphisms of a bounded symmetric domain, that
is, the group of diffeomorphisms which preserve simultaneously the hyperbolic
and the flat symplectic form. This group is the direct product of the compact
Lie group of linear automorphisms with an infinite-dimensional Abelian group.
This result appears as a kind of Schwarz lemma.Comment: 19 pages. Version 2: minor correction
Detecting alcohol vapors using two-dimensional copper-based Ruddlesden-Popper perovskites
The detection of alcohol vapors has many important applications, such as measuring the breath ethanol content to prevent drug-impaired driving. A medical application is the detection of 1-propanol because this compound was found to be a potential marker for lung cancer screening. This work reports an alcohol sensor using the two-dimensional Ruddlesden-Popper perovskite bis(phenethylammonium) tetrachlorocuprate-(PEA)(2)CuCl4, also known as phenethylammonium copper chloride-as the sensing material. The device is based on a change in conductance upon exposure to alcohol vapors. A comparison between pristine (PEA)(2)CuCl4 and (PEA)(2)CuCl4 after a treatment with ultraviolet light shows that the latter has a higher conductance. Devices made with this UV-converted material show a strong response to 1-propanol vapors, starting from a concentration around 2000 parts per million (ppm). Additionally, these devices demonstrate stable behavior in a nitrogen atmosphere. During the stabilization of the 1-propanol flow rate, the concentration fluctuates. These fluctuations were detected by monitoring the current of the device over time, down to steps in 100ppm around a concentration of 8000ppm. The conductance of the devices decreases in contact with air. However, this process can be reversed by additional ultraviolet illumination, thereby making the devices reusable
Technology Readiness in Customers’ Perception and Acceptance of M(obile)-Payment: An Empirical Study in Finland, Germany, the USA and Japan
In today`s mobile world there is a high potential for m(obile)-payment services, but the mere existence of such services does not mean that the market is ready for them. M-payment services must add value to attract new users. After years of research regarding technology acceptance (TA) of m-payment, the aim of this paper is to examine how technology readiness (TR) influences customers’ perception and acceptance of m-payment. TA of consumers in combination with TR is investigated for m-payment in Finland, Germany, the USA and Japan. We conduct an online survey to collect data in those four countries. We use that data to carry out a TA analysis using a structural equation model (SEM). The research model arises from the findings of a priori explorative study and a comprehensive literature review. Evaluation results based on an extended TA model (TAM) show that user acceptance of m-payment differs influenced by constructs
Phenomenology of a minimal extension of the standard model with a family-dependent gauge symmetry
We consider a gauge symmetry extension of the standard model given by
with minimal
particle content, where and are family dependent but determining the
hypercharge as , while is an exact discrete symmetry. In our
scenario, (while is followed by ) and charge assignments are
inspired by the number of fermion families and the stability of dark matter, as
observed, respectively. We examine the mass spectra of fermions, scalars, and
gauge bosons, as well as their interactions, in presence of a kinetic mixing
term between gauge fields. We discuss in detail the phenomenology
of the new gauge boson and the right-handed neutrino dark matter stabilized by
conservation. We obtain parameter spaces simultaneously satisfying the
recent CDF -boson mass, electroweak precision measurements, particle
colliders, as well as dark matter observables, if the kinetic mixing parameter
is not necessarily small.Comment: 32 pages, 4 figures, 5 tables; Matches published version in PR
Berezin quantization of homogeneous bounded domains
We prove that a homogeneous bounded domain admits a Berezin quantization
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