Star formation in relic HII regions of the first stars is investigated using magneto-hydrodynamical simulations with a nested grid method that covers ∼ 10 orders of magnitude in spatial scale and ∼ 20 orders of magnitude in density contrast. Due to larger fraction of H2 and HD molecules, its prestellar thermal evolution is considerably different from that in the first star formation. Reflecting...

It is found that the ideal magnetohydrodynamic equilibrium of an axisymmetric gravitating magnetically confined plasma with incompressible flows is governed by a second-order elliptic differential equation for the poloidal magnetic flux function containing five flux functions coupled with a Poisson equation for the gravitation potential, and an algebraic relation for the pressure. This set of e...

We consider a ferromagnetic Ising spin system isomorphic to a lattice gas with attractive interactions. Using the Fortuin, Kasteleyn and Ginibre (FKG) inequalities we derive bounds on the decay of correlations between two widely separated sets of particles in terms of the decay of the pair correlation. This leads to bounds on the derivatives of various orders of the free energy with respect to ...

An analytic calculation of the differential cross section for elastic Compton scattering on the deuteron at photon energies ω in the range of 25 − 50 MeV is presented to next-to-next-to-leading order, i.e. to an accuracy of ∼ 3%. The calculation is model-independent and performed in the low energy nuclear Effective Field Theory without dynamical pions. The iso-scalar, scalar electric and magnet...

Superalkali Li3 dissolved in gaseous ammonia is investigated by density functional theory. Similar to the lithium atom, Li3 can coordinate up to four ammonia molecules. Among the structural isomers of Li3(NH3)n (n = 1-4), the one with separately distributed NH3 ligands is preferred. Most of the Li3(NH3)n species possess the alkalide characteristics and exhibit considerably large static first hy...

We present the first results from fully general relativistic numerical studies of thick-disk accretion onto a rapidly-rotating (Kerr) black hole with a spin axis that is tilted (not aligned) with the angular momentum vector of the disk. We initialize the problem with the solution for an aligned, constant angular momentum, accreting thick disk around a black hole with spin a/M = J/M = +0.9 (prog...

Bu çalışmada İzmir Orman Bölge Müdürlüğü (OBM) sınırları içinde kullanılmak üzere, varlığı ve ekonomik değeri ile önemli bir orman ağacı türü olan fıstıkçamı (Pinus pinea L.)’nın tek çift girişli dikili kabuklu gövde hacim tabloları düzenlenmiştir. amaçla, OBM genelinde 275 adet örnek ağaçta ölçü yapılarak gerekli veri elde edilmiştir. Ağaçların 44’ü kontrol, 231’i model geliştirme grubu olarak...

One of the most troublesome contributions to the NNLO QCD corrections to B̄ → Xsγ originates from three-loop matrix elements of four-quark operators. A part of this contribution that is proportional to the QCD beta-function coefficient β0 was found in 2003 as an expansion in mc/mb. In the present paper, we evaluate the asymptotic behaviour of the complete contribution for mc ≫ mb/2. The asymptot...

Cloud evolution for various metallicities is investigated by three-dimensional nested grid simulations, in which the initial ratio of rotational to gravitational energy of the host cloud β0 (= 10 –10) and cloud metallicity Z (= 0–Z⊙) are parameters. Starting from a central number density of nc = 10 4 cm, cloud evolution for 48 models is calculated until the protostar is formed (nc ≃ 10 23 cm) o...