We revisit the d-dimensional arrangement problem and analyze the performance ratios of previously proposed algorithms based on the linear arrangement problem with d-dimensional cost. The two problems are related via space-filling curves and recursive balanced bipartitioning. We prove that the worst-case ratio of the optimum solutions of these problems is Θ(log n), where n is the number of verti...

We provide a link between topological graph theory and pseudoline arrangements from the theory of oriented matroids. We investigate and generalize a function f that assigns to each simple pseudoline arrangement with an even number of elements a pair of complete-graph embeddings on a surface. Each element of the pair keeps the information of the oriented matroid we started with. We call a simple...

A generalized configuration is a set of n points and (n 2 ) pseudolines such that each pseudoline passes through exactly two points, two pseudolines intersect exactly once, and no three pseudolines are concurrent. Following the approach of allowable sequences we prove a recursive inequality for the number of (≤ k)-sets for generalized configurations. As a consequence we improve the previously b...

Recently, the complex shearing of extruded tube (CSET) technique was proposed representing a new way processing tubes from bulk billet as combination extrusion with two passes equal channel angular and possible mandrel rotation. In present paper, influence rotation on final microstructure mechanical properties fabricated 3003 aluminium alloy investigated. Electron back scatter diffraction (EBSD...

We present a rare case of adenosquamous carcinoma of the lung in a patient with complete situs inversus. The patient was a 76-year-old woman with the chief complaint of hemosputum. Chest X-ray and computed tomography (CT) scans of the thorax showed a mirror image of the organs and vessels and revealed a tumor 3.5 cm in diameter, in the left lower lung field. She was referred and admitted to KKR...

This study describes a screening platform for a guided in situ vascular tissue engineering approach. Polymer rods were developed that upon 3 weeks of subcutaneous implantation evoke a controlled inflammatory response culminating in encapsulation by a tube-shaped autologous fibrocellular tissue capsule, which can form a basis for a tissue-engineered blood vessel. Rods of co-polymer were produced...

I N THE study of spatial vectorcardiography in this laboratory it has been the practice to construct wire models of the spatial vectorcardiogram from its frontal and sagittal projections which are presented on two cathode-ray tubes.'' 2 These three-dimensional models seemed necessary to facilitate visualization of the spatial characteristics of the vectorcardiogram, but their construction entai...

Particle size distribution (PSD) is one of the critical attributes crystals. PSD not only influences downstream processes but also controls final product performance in crystallization. In this work, we have used model system methanol–water-paracetamol for carrying out anti-solvent crystallization to produce paracetamol With reference a base case stirred tank, three devices connected tank with ...

Experiments were carried out on an evacuated tube solar air collector connected to intrinsic thermal power storage provide warm unless radiation was available. As a phase change material, stearic acid employed (PCM). Water has been used as base fluid for converting sunlight into electricity gain air, and the collector’s manifold energy store. The most significant temperature variation between e...