Search results for "BH"
showing 10 items of 1357 documents
Brownian motion in trapping enclosures: Steep potential wells, bistable wells and false bistability of induced Feynman-Kac (well) potentials
2019
We investigate signatures of convergence for a sequence of diffusion processes on a line, in conservative force fields stemming from superharmonic potentials $U(x)\sim x^m$, $m=2n \geq 2$. This is paralleled by a transformation of each $m$-th diffusion generator $L = D\Delta + b(x)\nabla $, and likewise the related Fokker-Planck operator $L^*= D\Delta - \nabla [b(x)\, \cdot]$, into the affiliated Schr\"{o}dinger one $\hat{H}= - D\Delta + {\cal{V}}(x)$. Upon a proper adjustment of operator domains, the dynamics is set by semigroups $\exp(tL)$, $\exp(tL_*)$ and $\exp(-t\hat{H})$, with $t \geq 0$. The Feynman-Kac integral kernel of $\exp(-t\hat{H})$ is the major building block of the relaxatio…
Forced oscillations in a self-oscillating surface reaction model
2004
A microscopic lattice gas model for the catalytic CO + O2 reaction on Pt(110) subject to external periodic forcing is studied by means of cellular automaton simulations. Harmonic resonance, subharmonic and superharmonic entrainment, quasiperiodic as well as chaotic behavior are among the observed phenomena in this model when the gas phase concentration of CO as an external control parameter is periodically varied and interacts with the self-oscillating reaction system.
Subharmonic phase-lock criteria for a class of weakly non-linear high-order oscillators
1985
Subharmonic frequency entrainment of high-order weakly non-linear oscillators is investigated. For the class of circuits considered, equations are first derived which provide the first approximation values for the amplitudes and phases of the two main spectral components of the steady-state waveform. Necessary and sufficient stability criteria are then derived in explicit from. The example worked out (a negative conductance double-tuned oscillator) shows the efficiency and ease of use of the proposed method.
Ridge-enhanced optical transmission through a continuous metal film
2004
Optical transmission through a continuous (without holes) metal film with a periodic structure of metal or dielectric ridges on one or both interfaces was numerically studied. The dependencies of the transmission on the ridge width and height as well as the ridge arrangements on the opposite interfaces were investigated in weak- and strong-coupling regimes. The transmission enhancement was shown to depend on the relative position of the ridge gratings on the opposite interfaces of a film, confirming the role of resonant tunneling processes involving states of the surface polariton Bloch modes.
Topotecan triggers apoptosis in p53-deficient cells by forcing degradation of XIAP and survivin thereby activating caspase-3-mediated Bid cleavage.
2009
The topoisomerase I inhibitor topotecan (TPT) is used in the therapy of different tumors including high-grade gliomas. We previously showed that TPT-induced apoptosis depends on p53 with p53 wild-type (wt) cells being more resistant because of p53-controlled degradation of topoisomerase I. Here, we show that p53-deficient (p53(-/-)) fibroblasts undergo excessive mitochondrial apoptosis featuring H2AX phosphorylation, Bcl-x(L) decline, cytochrome c release, caspase-9/-3/-2 activation, and cleavage of Bid. In wt and apaf-1(-/-) cells, caspase-2 did not become activated and Bid was not cleaved. In addition, p53(-/-) cells cotreated with TPT and caspase-3 inhibitor showed neither caspase-2 acti…
"Belye lilii" : genezis finskogo mifa v bolgarii, rol' russkogo fennofil'stva, finsko-bolgarskie kontakty i posredniki s konca XIX do konca XX veka
2004
Liilia Siibergin väitöstyössä osoitetaan, miten suomalaisista on kirjallisuuden kautta Bulgariassa tullut sankareita, joita kohtaan tunnetaan erityistä sympatiaa. Samalla suomalaisista sinkoutuu pois kaikki, mikä voisi viitata epätäydellisyyteen. – Emme enää voi puhua stereotypiasta, vaan kyseessä on kansallismyytti, Siiberg toteaa. Bulgarialaisilla ei kuitenkaan ole erityisasemaa suomalaisten mielissä. Väitöskirjassa tarkastellaan Suomen ja Bulgarian välisten kulttuuri- ja kirjallisuussuhteiden syntymistä ja kehitystä sekä tutkitaan kanssakäymisen erityispiirteitä vertailevan kirjallisuustieteen ja kulttuurintutkimuksen näkökulmasta. Siibergin esittämä malli Suomen kansallismyytin syntymis…
Novel method and instruments for the optimal techno-economic sizing of borehole heat exchangers
2021
El test de respuesta térmica (TRT) es ampliamente utilizado como método estándar para caracterizar las propiedades térmicas del terreno adyacente a un intercambiador de calor enterrado (BHE). Los métodos tradicionales para interpretar los resultados aplican soluciones analíticas o numéricas asumiendo que el terreno es infinito, homogéneo e isotrópico. Sin embargo, en realidad el subsuelo presenta generalmente una estructura estratificada y heterogénea, y por lo tanto las propiedades térmicas pueden variar sustancialmente con la profundidad. En este sentido y con la intención de resolver las limitaciones del TRT estándar, la presente tesis doctoral se centra en el desarrollo de métodos e ins…
Responde D. Francisco Templado à los diez pliegos, y medio de D. Antonio Puente Hurtado de Mendoza, en un pliego de papel
1690
Sig. A4 Reclams
Respuesta a la respuesta de una Consulta, sobre si son licitas las Comedias que se usan en España / Por Don Andres de Auila y Heredia, Señor de la …
1683
Sig. A4 Reclams
Arbitrage politico-militar / Sentencia difinitiva del Señor de la Garena, Ingeniero ingenioso de las Maquinas Belicas de España ; Pronunciada en el…
1683
Sig. A-D4, E2 Port. orlada. - Reclams