Ti–6Al–4V powder preforms containing parallel layers of steel wiremeshes are sintered into composites. Elongatedmacropores are created by electrochemical dissolution of the steel wires, and equiaxedmicroccepted 17 August 2009

Considering the network structure is one of the new approaches in studying stochastic PERT networks (SPN). In this paper, planar networks are studied as a special class of networks. Two structural reducible mechanisms titled arc contraction and deletion are developed to convert any planar network to a series-parallel network structure. In series-parallel SPN, the completion time distribution f...

Considering the network structure is one of the new approaches in studying stochastic PERT networks (SPN). In this paper, planar networks are studied as a special class of networks. Two structural reducible mechanisms titled arc contraction and deletion are developed to convert any planar network to a series-parallel network structure.&#10In series-parallel SPN, the completion time distribution...

this study was aimed to assess wheat-grown fields health in gharessoo basin, golestan province, iran, using 79 fields in 8 villages in 2010. the samples were taken by quadrates. the number and the type of weeds were recorded at genera and species levels. in parallel, management data were recorded by questionnaire. species richness was defined as species number and shannon-wiener index, simpson’...

Thermal radiation from finite-conductivity boundaries can strongly affect the stability of horizontally unbounded, plane fluid layers heated from below. The role of thermal radiation in plane layer instabilities is studied under the assumption that the fluid medium is transparent, as a model of infrared transfer through gas layers. The solution procedure modifies a previous formulation of the c...

The molecule of the title compound adopts a twisted geometry with rotation approximately 30° between mean planes imidazole and phenyl rings. crystal structure displays hydrogen bonded chains as result N–H···N interactions rings neighboring molecules. These H-bonded are assembled into flat molecular layers parallel to (121) plane. Two intermolecular interactions, involving inversion-related mole...

The common feature of the title compounds, [Zn(C5H10NO2S2)2(C10H8N2)]·2H2O, (I), and [Zn(C6H12NOS2)2(C10H8N2)], (II), is the location of the Zn(II) atoms on a twofold rotation axis. Further, each Zn(II) atom is chelated by two symmetry-equivalent and symmetrically coordinating di-thio-carbamate ligands and a 2,2'-bi-pyridine ligand. The resulting N2S4 coordination geometry is based on a highly ...