736 research outputs found
A note on monopole moduli spaces
We discuss the structure of the framed moduli space of Bogomolny monopoles
for arbitrary symmetry breaking and extend the definition of its stratification
to the case of arbitrary compact Lie groups. We show that each stratum is a
union of submanifolds for which we conjecture that the natural metric is
hyperKahler. The dimensions of the strata and of these submanifolds are
calculated, and it is found that for the latter, the dimension is always a
multiple of four.Comment: 17 pages, LaTe
129. Zaburzenia liczby kopii genów erbB-1 i erbB-2 i ich związek z danymi klinicznymi u leczonych operacyjnie chorych na niedrobnokomórkowego raka płuca
Szlak sygnałowy nabłonkowego czynnika wzrostu (ang. epidermal growth factor, EGF) i jego receptory (najważniejsze z nich to erbB-1 i erbB-2) odgrywają ważną rolę w patogenezie i progresji raka płuca. Kliniczne znaczenie nadekspresji tych receptorów pozostaje nadal przedmiotem kontrowersji a dotychczasowe badania przynosiły sprzeczne wyniki. Z uwagi na opracowane ostatnio leki o wybiórczym działaniu przeciwnowotworowym, działające poprzez powyższe receptory, poznanie rokowniczego znaczenia tych zaburzeń może odegrać ważną rolę w ustalaniu optymalnego sposobu leczenia. Celem pracy była ocena rokowniczego znaczenia anomalii średniej liczby kopii genów (ang. avarage gene copy numer, AGCN) u chorych na niedrobnokomórkowego raka płuca poddanych resekcji miąższu płucnego.Materiał i metodyDo badania włączono 112 chorych leczonych operacyjnie w latach 1996–1999. U 61 chorych (55%) rozpoznano postać raka płaskonabłonkowego, u 30 (27%) gruczolakoraka, u 10 (9%) raka wielokomórkowego i u 10 (9%) chorych postacie mieszane. Stopień zaawansowania nowotworu kształtował się następująco: I=54 (48%), II=11 (10%), III=40 (36%), IV=7 (6%). Materiał do analizy molekularnej stanowiło DNA izolowane ze świeżo mrożonych wycinków guza pobranych podczas zabiegu operacyjnego. AGCN określano za pomocą podwójnie różnicowej reakcji polimerazy i elektroforezy agarozowej.WynikiŚrednia wartość AGCN dla erbB-1 wynosiła 2,0 (zakres od 0,01 do 28,07), a dla erbB-2 1,34 (zakres od 0,11 do 9,9). Stwierdzono znamienną zależność pomiędzy AGCN dla obu genów. Nie stwierdzono znamiennego związku z jakimkolwiek głównym parametrem klinicznym. Do czasu przeprowadzenia analizy zmarło 73 chorych (65%). Po czasie obserwacji o medianie 5,1 roku nie stwierdzono wpływu AGCN na czas przeżycia (log-rank, P=0,9; 0,83; 0,8 odpowiednio dla erbB-1, erbB-2 i dla obu genów łącznie).WnioskiUzyskane wyniki wskazują na brak rokowniczego znaczenia AGCN erbB-1 i erbB-2 u chorych na raka płuca poddanych resekcji miąższu płucnego
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New Thermal Taste Actuation Technology for Future Multisensory Virtual Reality and Internet
Today’s virtual reality (VR) applications are mainly based on audio, visual, and haptic interactions between human and virtual world. Integrating the sense of taste into VR is difficult since we are dependent on chemical-based taste delivery systems. Therefore, developing a proper non-chemical digital taste actuation technology can unlock taste experiences in VR applications such as gaming, multisensory entertainment, remote dining, and online shopping. This paper presents the ‘Thermal Taste Machine’, a new digital taste actuation technology that can effectively produce and modify thermal taste sensations on the tongue. This device changes the temperature of the surface of the tongue within a short period of time (from 25 ◦ C to 40 ◦ C while heating and from 25 ◦ C to 10 ◦ C while cooling). We tested this device on human subjects and described the experience of thermal taste using 20 known (taste and non-taste) sensations. Our results suggested that rapidly heating the tongue produce sweetness, fatty/oiliness, electric taste, warmness, and reduced the sensibility for metallic taste. Similarly, participants reported that the cooling the tongue produced mint taste, pleasantness, and coldness. By conducting an another user study on the perceived sweetness of sucrose solutions after the thermal stimulation, we found that heating the tongue significantly enhanced the intensity of sweetness for both thermal tasters and non-thermal tasters. Also, we found that faster temperature rise on the tongue produce more intense sweet sensations for thermal tasters. We believe that this technology will be useful in two ways: First, it can produce taste sensations without using chemicals for the individuals who are sensitive to thermal taste. Second, the temperature rise of the device can be used as a way to enhance the intensity of sweetness. We believe that this technology can be used to digitally produce and enhance taste sensations in future virtual reality applications. The key novelties of this paper are as follows: 1. Development of a thermal taste actuation technology for stimulating the human taste receptors, 2. Characterization of the thermal taste produced by the device based on a set of taste related sensations and non-taste related sensations, 3. Research on enhancing the intensity for sucrose using thermal stimulation, 4. Research on how different speeds of heating affect the intensity of sweetness produced by thermal stimulation
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Side channel attacks on smart home systems: A short overview
This paper provides an overview on side-channel attacks with emphasis on vulnerabilities in the smart home. Smart homes are enabled by the latest developments in sensors, communication technologies, internet protocols, and cloud services. The goal of a smart home is to have smart household devices collaborate without involvement of residents to deliver the variety of services needed for a higher quality of life. However, security and privacy challenges of smart homes have to be overcome in order to fully realize the smart home. Side channel attacks assume data is always leaking, and leakage of data from a smart home reveals sensitive information. This paper starts by reviewing side-channel attack categories, then it gives an overview on recent attack studies on different layers of a smart home and their malicious goals
Inversion symmetric 3-monopoles and the Atiyah-Hitchin manifold
We consider 3-monopoles symmetric under inversion symmetry. We show that the
moduli space of these monopoles is an Atiyah-Hitchin submanifold of the
3-monopole moduli space. This allows what is known about 2-monopole dynamics to
be translated into results about the dynamics of 3-monopoles. Using a numerical
ADHMN construction we compute the monopole energy density at various points on
two interesting geodesics. The first is a geodesic over the two-dimensional
rounded cone submanifold corresponding to right angle scattering and the second
is a closed geodesic for three orbiting monopoles.Comment: latex, 22 pages, 2 figures. To appear in Nonlinearit
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Magnetic table for levitating food for entertainment
In this paper, we discuss our work towards a new dining platform that uses magnetic levitating food and magnetic utensils in an initial prototype device. The ultimate goal of the project is a complete table with dynamic levitating food, but the current implementation is a set of levitating magnets that can be encased in food hovering over static locations. We investigated different weights and shapes of 3-D printed objects to mimic food and found that the levitating magnets are strong enough to support lightweight food. This magnetic levitating table can produce a playful and entertaining dining experience by moving and rotating to stay in place. The key novelties of this paper are the integration of food with a magnetic levitating table for playful interactions and novel dining experiences
New hyper-Kaehler manifolds by fixing monopoles
The construction of new hyper-Kaehler manifolds by taking the infinite
monopole mass limit of certain Bogomol'nyi-Prasad-Sommerfield monopole moduli
spaces is considered. The one-parameter family of hyperkaehler manifolds due to
Dancer is shown to be an example of such manifolds. A new family of fixed
monopole spaces is constructed. They are the moduli spaces of four SU(4)
monopoles, in the infinite mass limit of two of the monopoles. These manifolds
are shown to be nonsingular when the fixed monopole positions are distinct.Comment: Version in Phys. Rev. D. 11 pp, RevTeX, 14 Postscript diagram
Memory difference control of unknown unstable fixed points: Drifting parameter conditions and delayed measurement
Difference control schemes for controlling unstable fixed points become
important if the exact position of the fixed point is unavailable or moving due
to drifting parameters. We propose a memory difference control method for
stabilization of a priori unknown unstable fixed points by introducing a memory
term. If the amplitude of the control applied in the previous time step is
added to the present control signal, fixed points with arbitrary Lyapunov
numbers can be controlled. This method is also extended to compensate arbitrary
time steps of measurement delay. We show that our method stabilizes orbits of
the Chua circuit where ordinary difference control fails.Comment: 5 pages, 8 figures. See also chao-dyn/9810029 (Phys. Rev. E 70,
056225) and nlin.CD/0204031 (Phys. Rev. E 70, 046205
Twisting gauged non-linear sigma-models
We consider gauged sigma-models from a Riemann surface into a Kaehler and
hamiltonian G-manifold X. The supersymmetric N=2 theory can always be twisted
to produce a gauged A-model. This model localizes to the moduli space of
solutions of the vortex equations and computes the Hamiltonian Gromov-Witten
invariants. When the target is equivariantly Calabi-Yau, i.e. when its first
G-equivariant Chern class vanishes, the supersymmetric theory can also be
twisted into a gauged B-model. This model localizes to the Kaehler quotient
X//G.Comment: 33 pages; v2: small additions, published versio
Polarization properties of laser-diode-pumped micro-grained Nd:YAG ceramic lasers
Detailed polarization properties have been examined in laser-diode-pumped
(LD-pumped) micro-grained ceramic Nd:YAG lasers in different microchip cavity
configurations. Stable linearly-polarized single-frequency oscillations, whose
polarization direction coincide with that of an LD pump light, were observed in
an external cavity scheme. While, in the case of a thin-slice laser scheme with
coated reflective ends, elliptically-polarized single-frequency operations took
place in the low pump-power regime and dynamic instabilities appeared,
featuring self-induced antiphase modulations among counter-rotating
circularly-polarized components having slightly different lasing frequencies,
with increasing the pump power.Comment: 9 pages, 5 figure
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