Linear-response time-dependent density-functional theory (TDDFT) can describe excitonic features in the optical spectra of insulators and semiconductors, using exchange-correlation (xc) kernels behaving as $-1/k^{2}$ to leading order. We show how excitons be modeled real-time TDDFT, an xc vector potential constructed from approximate, long-range corrected kernels. demonstrate for various materi...

The Witt group of smooth real projective curves was first computed by Knebusch in [Kn]. If the curve is not complete but still smooth, the Witt group is also studied in [Kn] but not explicitely calculated. However, for some precise examples of smooth affine curves, we may find explicit calculations ([Knu] and [Ay-Oj]). In this paper, the Witt group of a general smooth curve is explicitely calcu...

In the last ten to fifteen years many phenomena that could only be studied using physical experiments can now be studied by computer experiments. Advances in the mathematical modeling of many physical processes, in algorithms for solving mathematical systems, and in computer speeds, have combined to make it possible to replace some physical experiments with computer experiments. In a computer e...

Derivation of Cost Function. The projection of the joint probability distribution of the random variables X = (X1, X2, . . . , Xn), associated with the vertices in V , on a decomposable graph G is given by: pG(x) = ∏ C∈C(G) pC(xC) ∏ (C,D)∈T (G) pC∩D(xC∩D) , (1) where x is an instance in the domain of X, which we denote by X . pC(xC) denotes the marginal distribution of random variables belongin...

OBJECTIVE To verify if the connection of electrodes for heart and transcutaneous oxygen monitoring interfere with the measurement of electrical bioimpedance in preterm newborns. METHODS This was a prospective, blinded, controlled, cross-sectional, crossover study that assessed and compared paired measures of resistance (R) and reactance (Xc) by BIA, obtained with and without monitoring wires ...

BACKGROUND Bioelectrical impedance analysis (BIA) gives resistance (R) and reactance (Xc). R and Xc normalized for body height (H) can be plotted as a bivariate vector (H(2)/Xc versus H(2)/R). Vector BIA is useful for studying the determinants of BIA results. OBJECTIVE We investigated the effect of age on BIA results and its relevance to body-composition analysis in a large database of impeda...

PURPOSE Assessment of post-exercise changes in hydration with bioimpedance (BI) is complicated by physiological adaptations that affect resistance (R) and reactance (Xc) values. This study investigated exercise-induced changes in R and Xc, independently and in bioelectrical impedance vector analysis, when factors such as increased skin temperature and blood flow and surface electrolyte accumula...

Purpose: (4S)-4-(3-[F]fluoropropyl)-L-glutamate (BAY 94-9392, alias [F]FSPG) is a new tracer to image xC transporter activity with positron emission tomography (PET). We aimed to explore the tumor detection rate of [F]FSPG in patients relative to 2-[F]fluoro-2-deoxyglucose ([F]FDG). The correlation of [F]FSPG uptake with immunohistochemical expression of xC transporter and CD44, which stabilize...

Binary GexS100-x glasses reveal a richness of elastic and chemical phase transitions driven by network topology. With increasing Ge content (x), well-defined rigidity at xc(1) = 19.3(5)% and a stress transition at xc(2) = 24.9(5)% are observed in Raman scattering. In modulated DSC measurements, the nonreversing enthalpy of relaxation at Tg reveals a square-well-like minimum (reversibility windo...

Kohn-Sham density functional theory (DFT) has become established as an indispensable tool for investigating aqueous systems of all kinds, including those important in chemistry, surface science, biology, and the earth sciences. Nevertheless, many widely used approximations for the exchange-correlation (XC) functional describe the properties of pure water systems with an accuracy that is not ful...