In this paper, we prove the exact null controllability of certain diffusion system by rewriting it as an equivalent nonlinear parabolic integrodifferential equation with variable coefficients in a bounded interval of R with a distributed control acting on a subinterval. We first prove a global null controllability result of an associated linearized integrodifferential equation by establishing a...

The physics associated with spherically symmetric charged black holes are analyzed from the point of view of weak gravitational lensing as a means for determining the dimensionality of spacetime. In particular, the effect of charged black holes in four and five space time dimensions on the motion of photons are studied using the equations for the null geodesics and deriving the weak limit bendi...

The nature of fast magnetoacoustic and Alfvén waves is investigated in a zero β plasma. This gives an indication of wave propagation in the low β solar corona. It is found that for a two-dimensional null point, the fast wave is attracted to that point and the front of the wave slows down as it approaches the null point, causing the current density to accumulate there and rise rapidly. Ohmic dis...

Bovine herpesvirus 1 (BHV-1) infected-cell protein 0 (bICP0) stimulates productive infection by activating viral gene expression. In this study, an attempt was made to construct a recombinant virus with point mutations in the C(3)HC(4) zinc RING finger of bICP0, as this domain is necessary for activating viral transcription and productive infection. A virus was identified in bovine cells that i...

traditional work on pro-drop languages identified a set of parametric values ‎associated with the availability of null subjects, including the presence of null ‎expletive subjects. in the same vein, but more within the framework of minimalist ‎program, i will discuss while referential subjects may optionally be overt or covert ‎in the persian, expletives are obligatorily null. in this regard, a...

background: human leukocyte antigen-g (hla-g) is a non-classical class i molecule highly expressed by extravillous cytotrophoblast cells. due to a single base pair deletion, its function can be compensated by other isoforms. investigating the frequency of null allele in recurrent miscarriage (rm) subjects could be useful in understanding the relationship between frequency of this allele and rm ...

Context. At this time there does not exist a robust set of rules connecting low and high β waves across the β ≈ 1 layer. The work here contributes specifically to what happens when a low β fast wave crosses the β ≈ 1 layer and transforms into high β fast and slow waves. Aims. The nature of fast and slow magnetoacoustic waves is investigated in a finite β plasma in the neighbourhood of a twodime...

Given a null geodesic γ0(λ) with a point r in (p, q) conjugate to p along γ0(λ) , there will be a variation of γ0(λ) which will give a time-like curve from p to q. This is a well-known theory proved in the famous book[3]. In the paper we prove that the timelike curves coming from the above-mentioned variation have a proper acceleration which approaches infinity as the time-like curve approaches...

Bayesian testing of a point null hypothesis is considered. The null hypothesis is that an observation, x, is distributed according to the normal distribution with a mean of zero and known variance σ. The alternative hypothesis is that x is distributed according to a normal distribution with an unknown nonzero mean, μ, and variance σ. The testing problem is formulated as a prediction problem. Ba...

We use a Null Space algorithm approach to solve augmented systems produced by the mixed finite element approximation of saddle point problems. We compare the use of an orthogonal factorization technique for sparse matrices with the use of a sparse Gaussian elimination for the computation of the Null Space. Finally, we present the results of the numerical tests which we performed on selected pro...