1,133 research outputs found
Record of Tramea virginia (Rambur, 1842) (Odonata: Libellulidae) from the West Pacific Ocean
Abstract: This paper provides a photo of a male Tramea virginia (Rambur, 1842) taken from the West Pacific Ocean, approximately 30 km east of the nearest land. This photo serves as a migration record, and the paper also briefly discusses the migration behavior of the genus Tramea Hagen, 1861
Does Privacy Still Matter in the Era of Web 2.0? A Qualitative Study of User Behavior towards Online Social Networking Activities
In this study, we attempt to understand one frequently observed paradox in user social networking behavior – highly concerned about privacy issues on social networking sites, yet actively participating in social networking activities. Based on qualitative analysis of student essays on their social networking activities and perceptions, we propose a theory for user online social networking behavior – the adaptive cognition theory (ACT). The main argument of the theory is that user behavior toward social networking is dynamic and adaptive primarily influenced by the perceived benefits and risks. More often than not, the perceived benefits dominate the perceived risks in user behavior calculus, resulting in the commonly observed phenomenon that users seem to ignore privacy concerns when participating in social networking activities and using social networking web sites. We argue that ACT explains user social networking behavior better than well-established behavioral theories do such as TAM, TPB, and rational choice. Furthermore, ACT provides prescriptive insights for managers of social networking sites and companies interested in taking advantage of the social networking phenomenon. Limitations and future research directions are discussed as well
Nonstandard finite element de Rham complexes on cubical meshes
We propose two general operations on finite element differential complexes on
cubical meshes that can be used to construct and analyze sequences of
"nonstandard" convergent methods. The first operation, called DoF-transfer,
moves edge degrees of freedom to vertices in a way that reduces global degrees
of freedom while increasing continuity order at vertices. The second operation,
called serendipity, eliminates interior bubble functions and degrees of freedom
locally on each element without affecting edge degrees of freedom. These
operations can be used independently or in tandem to create nonstandard
complexes that incorporate Hermite, Adini and "trimmed-Adini" elements. We show
that the resulting elements provide convergent, non-conforming methods for
problems requiring stronger regularity and satisfy a discrete Korn inequality.
We discuss potential benefits of applying these elements to Stokes, biharmonic
and elasticity problems.Comment: 31 page
Deforming black holes with even multipolar differential rotation boundary
Motivated by the novel asymptotically global AdS solutions with deforming
horizon in [JHEP {\bf 1802}, 060 (2018)], we analyze the boundary metric with
even multipolar differential rotation and numerically construct a family of
deforming solutions with quadrupolar differential rotation boundary, including
two classes of solutions: solitons and black holes. In contrast to solutions
with dipolar differential rotation boundary, we find that even though the norm
of Killing vector becomes spacelike for certain regions of polar
angle when , solitons and black holes with quadrupolar
differential rotation still exist and do not develop hair due to superradiance.
Moreover, at the same temperature, the horizonal deformation of quadrupolar
rotation is smaller than that of dipolar rotation. Furthermore, we also study
the entropy and quasinormal modes of the solutions, which have the analogous
properties to that of dipolar rotation.Comment: 18 pages, 21 figure
Distortion risk measures in random environments: construction and axiomatic characterization
The risk of a financial position shines through by means of the fluctuation
of its market price. The factors affecting the price of a financial position
include not only market internal factors, but also other various market
external factors. The latter can be understood as sorts of environments to
which financial positions have to expose. Motivated by this observation, this
paper aims to design a novel axiomatic approach to risk measures in random
environments. We construct a new distortion-type risk measure, which can
appropriately evaluate the risk of financial positions in the presence of
environments. After having studied its fundamental properties, we also
axiomatically characterize it. Furthermore, its coherence and dual
representation are investigated. The new class of risk measures in random
environments is large enough, for example, it not only can recover some known
risk measures such as the common weighted value at risk and range value at
risk, but also can induce other new specific risk measures such as risk
measures in the presence of background risk. Examples are given to illustrate
the new framework of risk measures. This paper gives some theoretical results
about risk measures in random environments, helping one to have an insight look
at the potential impact of environments on risk measures of positions.Comment: 47 pages, no figure
Risk measurement of joint risk of portfolios: a liquidity shortfall aspect
This paper presents a novel axiomatic framework of measuring the joint risk
of a portfolio consisting of several financial positions. From the liquidity
shortfall aspect, we construct a distortion-type risk measure to measure the
joint risk of portfolios, which we referred to as multivariate distortion joint
risk measure, representing the liquidity shortfall caused by the joint risk of
portfolios. After its fundamental properties have been studied, we
axiomatically characterize it by proposing a novel set of axioms. Furthermore,
based on the representations for multivariate distortion joint risk measures,
we also propose a new class of vector-valued multivariate distortion joint risk
measures, as well as with sensible financial interpretation. Their fundamental
properties are also investigated. It turns out that this new class is large
enough, as it can not only induce new vector-valued multivariate risk measures,
but also recover some popular vector-valued multivariate risk measures known in
the literature with alternative financial interpretation. Examples are given to
illustrate the proposed multivariate distortion joint risk measures. This paper
mainly gives some theoretical results, helping one to have an insight look at
the measurement of joint risk of portfolios.Comment: 45 pages, 0 figur
Glueball Masses from Hamiltonian Lattice QCD
We calculate the masses of the , and glueballs from
QCD in 3+1 dimensions using an eigenvalue equation method for Hamiltonian
lattice QCD developed and described elsewhere by the authors. The mass ratios
become approximately constants in the coupling region ,
from which we estimate and
.Comment: 12 pages, Latex, figures to be sent upon reques
MPMQA: Multimodal Question Answering on Product Manuals
Visual contents, such as illustrations and images, play a big role in product
manual understanding. Existing Product Manual Question Answering (PMQA)
datasets tend to ignore visual contents and only retain textual parts. In this
work, to emphasize the importance of multimodal contents, we propose a
Multimodal Product Manual Question Answering (MPMQA) task. For each question,
MPMQA requires the model not only to process multimodal contents but also to
provide multimodal answers. To support MPMQA, a large-scale dataset PM209 is
constructed with human annotations, which contains 209 product manuals from 27
well-known consumer electronic brands. Human annotations include 6 types of
semantic regions for manual contents and 22,021 pairs of question and answer.
Especially, each answer consists of a textual sentence and related visual
regions from manuals. Taking into account the length of product manuals and the
fact that a question is always related to a small number of pages, MPMQA can be
naturally split into two subtasks: retrieving most related pages and then
generating multimodal answers. We further propose a unified model that can
perform these two subtasks all together and achieve comparable performance with
multiple task-specific models. The PM209 dataset is available at
https://github.com/AIM3-RUC/MPMQA
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