4,394 research outputs found
Unsupervised Segmentation of Action Segments in Egocentric Videos using Gaze
Unsupervised segmentation of action segments in egocentric videos is a
desirable feature in tasks such as activity recognition and content-based video
retrieval. Reducing the search space into a finite set of action segments
facilitates a faster and less noisy matching. However, there exist a
substantial gap in machine understanding of natural temporal cuts during a
continuous human activity. This work reports on a novel gaze-based approach for
segmenting action segments in videos captured using an egocentric camera. Gaze
is used to locate the region-of-interest inside a frame. By tracking two simple
motion-based parameters inside successive regions-of-interest, we discover a
finite set of temporal cuts. We present several results using combinations (of
the two parameters) on a dataset, i.e., BRISGAZE-ACTIONS. The dataset contains
egocentric videos depicting several daily-living activities. The quality of the
temporal cuts is further improved by implementing two entropy measures.Comment: To appear in 2017 IEEE International Conference On Signal and Image
Processing Application
2-index chiral gauge theories
We undertake a systematic study of the -dimensional -index
chiral gauge theories and investigate their faithful global symmetries and
dynamics. These are a finite set of theories with fermions in the -index
symmetric and anti-symmetric representations, with no fundamentals, and they do
not admit a large- limit. We employ a combination of perturbative and
nonperturbative methods, enabling us to constrain their infrared (IR) phases.
Specifically, we leverage the 't Hooft anomalies associated with continuous and
discrete groups to eliminate a few scenarios. In some cases, the anomalies rule
out the possibility of fermion composites. In other cases, the interplay
between the continuous and discrete anomalies leads to multiple higher-order
condensates, which inevitably form to match the anomalies. Further, we pinpoint
the most probable symmetry-breaking patterns by searching for condensates that
match the full set of anomalies resulting in the smallest number of IR degrees
of freedom. Higher-loop -function analysis suggests that a few theories
may flow to a conformal fixed point.Comment: 40 pages + appendice
2-index chiral gauge theories
We undertake a systematic study of the 4-dimensional SU(N) 2-index chiral gauge theories and investigate their faithful global symmetries and dynamics. These are a finite set of theories with fermions in the 2-index symmetric and anti-symmetric representations, with no fundamentals, and they do not admit a large-N limit. We employ a combination of perturbative and nonperturbative methods, enabling us to constrain their infrared (IR) phases. Specifically, we leverage the ’t Hooft anomalies associated with continuous and discrete groups to eliminate a few scenarios. In some cases, the anomalies rule out the possibility of fermion composites. In other cases, the interplay between the continuous and discrete anomalies leads to multiple higher-order condensates, which inevitably form to match the anomalies. Further, we pinpoint the most probable symmetry-breaking patterns by searching for condensates that match the full set of anomalies resulting in the smallest number of IR degrees of freedom. Higher-loop β-function analysis suggests that a few theories may flow to a conformal fixed point
Noninvertible symmetries and anomalies from gauging -form electric centers
We devise a general method for obtaining -form noninvertible discrete
chiral symmetries in -dimensional and gauge theories with matter in arbitrary representations,
where is a subgroup of the electric -form center symmetry. Our
approach involves placing the theory on a three-torus and utilizing the
Hamiltonian formalism to construct noninvertible operators by introducing
twists compatible with the gauging of . These theories exhibit
electric -form and magnetic -form global symmetries, and their generators
play a crucial role in constructing the corresponding Hilbert space. The
noninvertible operators are demonstrated to project onto specific Hilbert space
sectors characterized by particular magnetic fluxes. Furthermore, when
subjected to twists by the electric -form global symmetry, these surviving
sectors reveal an anomaly between the noninvertible and the -form
symmetries. We argue that an anomaly implies that certain sectors,
characterized by the eigenvalues of the electric symmetry generators, exhibit
multi-fold degeneracies. When we couple these theories to axions, infrared
axionic noninvertible operators inherit the ultraviolet structure of the
theory, including the projective nature of the operators and their anomalies.
We discuss various examples of vector and chiral gauge theories that showcase
the versatility of our approach.Comment: 42 page
Spin injection in Silicon at zero magnetic field
In this letter, we show efficient electrical spin injection into a SiGe based
\textit{p-i-n} light emitting diode from the remanent state of a
perpendicularly magnetized ferromagnetic contact. Electron spin injection is
carried out through an alumina tunnel barrier from a Co/Pt thin film exhibiting
a strong out-of-plane anisotropy. The electrons spin polarization is then
analysed through the circular polarization of emitted light. All the light
polarization measurements are performed without an external applied magnetic
field \textit{i.e.} in remanent magnetic states. The light polarization as a
function of the magnetic field closely traces the out-of-plane magnetization of
the Co/Pt injector. We could achieve a circular polarization degree of the
emitted light of 3 % at 5 K. Moreover this light polarization remains almost
constant at least up to 200 K.Comment: accepted in AP
Superlight small bipolarons from realistic long-range Coulomb and Fr\"ohlich interactions
We report analytical and numerical results on the two-particle states of the
polaronic t-Jp model derived recently with realistic Coulomb and
electron-phonon (Frohlich) interactions in doped polar insulators. Eigenstates
and eigenvalues are calculated for two different geometries. Our results show
that the ground state is a bipolaronic singlet, made up of two polarons. The
bipolaron size increases with increasing ratio of the polaron hopping integral
t to the exchange interaction Jp but remains small compared to the system size
in the whole range 0<t/Jp<1. Furthermore, the model exhibits a phase transition
to a superconducting state with a critical temperature well in excess of 100K.
In the range t/Jp<1, there are distinct charge and spin gaps opening in the
density of states, specific heat, and magnetic susceptibility well above Tc.Comment: Calculation section and discussion of gap have been updated. Revised
calculations now enhance the predicted T_c in our model to over 200 K at
large hoppin
THE PERCEPTION OF ESTATE MANAGEMENT STUDENTS OF COVENANT UNIVERSITY TO THE COURSE VALUATION: COMPREHENSIBLE OR NOT?
Valuation is very important to the real estate profession. It is a veritable tool for decision making in property
transaction and require that opinion of values given for an interest in landed property by practitioners are reliable
and consistent. However, the study of valuation by university students appears to have generated bias over the years.
The failure rate in valuation compared to other courses seems to be higher. The aim of this paper is to examine the
Perception of Estate Management students to the study of valuation. Estate management students of covenant
university students from 200 to 500 levels (being the levels offering valuation as a subject) were adopted as
population sample for the study. Structured questionnaires were analyzed and the simple descriptive statistics were
used for the study. The outcome of the study shows that some of the students are not fully aware of the course-
Estate Management but were compelled to study it and as such are not enjoying some of the subjects particularly
valuation while some are aware but find valuation particularly difficult and the others are of the opinion that
valuation is very interesting. It recommends that more orientation should be given to students about the different
discipline and the courses / subjects that make up the study before embarking on such a study at the universit
The Effect of Luteolin on Human Glioblastoma
Glioblastoma multiforme (GBM) is widely recognized as the most common and lethal of the malignant gliomas. Few effective therapeutic treatments are available as five-year survival rates of diagnosed individuals are less than five percent. Luteolin, a common flavonoid found in a variety of fruits and vegetables, has demonstrated significant promise in combating cancers of the breast, colon, liver, lung, and bone. In this study, we investigated the effects of luteolin on glioblastoma multiforme cell lines U-251, U-87, and U-1242. Cell viability was assessed using cell count with trypan blue exclusion and MTT assays. Results revealed that luteolin reduces GBM cell viability and cell proliferation in a time and concentration-dependent manner. Western Blot analysis indicated that luteolin decreased AKT, ERK, and MAPK phosphorylation following treatment with EGF. Additionally, luteolin promoted apoptosis in GBM cells by inducing PARP and caspase-3 cleavage, and decreasing levels of the anti-apoptotic protein BCL-XL. Our results indicate that luteolin exhibits a biological effect and may be used as a therapeutic agent for glioblastoma multiforme
Endothelin-3 like immunoreactivity in plasma of patients with cirrhosis of the liver
A highly specific and sensitive radioimmunoassay (RIA) has been established for determination of endothelin-3 like immunoreactivity in human plasma to investigate its possible role in hemodynamic alterations due to liver disease. Crossreactivity with other endothelin isoforms was always below 4 %, the lower detection limit following extraction on Sep-Pak C18 cartridges was 0.5 pg/ml. The concentration of endothelin-3 (mean ± SEM) was 4.16 ± 0.56 pg/ml (n = 13) in plasma of patients with cirrhosis of the liver, three fold higher than in age matched controls (1.35 ± 0.27 pg/ml, n = 12, p < 0.01). Plasma immunoreactivity was confirmed to be endothelin-3 related by reverse-phase HPLC. These data could suggest a role of plasma endothelin-3 in circulatory changes, as they occur in cirrhosis of the liver
- …