We establish the polynomial-time solvability of a class of vector partition problems with linear objectives subject to restrictions on the number of elements in each part. c © 2000 Published by Elsevier Science B.V. All rights reserved. 1. Shaped partition problems The shaped partition problem concerns the partitioning of n vectors A; : : : ; A in d-space into p parts so as to maximize an objec...

We demonstrate that nondiffracting beams can be generated with an arbitrary transverse shape. In particular, we show that the azimuthal complex modulation of the angular spectra of Helmholtz-Gauss wave fields constitutes a degree of freedom sufficient to tailor nondiffracting beams with an intensity pattern of choice.

Heart-shaped clones he intricate shape of the heart is formed by oriented cell growth patterns, according to Meilhac et al. on page 97. The heart is formed during embryo-genesis from a simple tube-like structure. As it grows, the tube morphs into the complicated but familiar shape of our four-chambered heart. How one set of cells in the tube expands to acquire the shape of a ventricle while oth...

In September 2001, during follow-up at our outpatient liver unit we detected by ultrasound a hypervascular mass adjacent to the VI hepatic segment in a 78-year-old HCV-positive cirrhotic woman. Subsequently abdominal computed tomography (CT) revealed an infiltrative vascularized nodule (3.5 cm in diameter) at the lower border of the VI hepatic segment and magnetic resonance imaging showed a “te...

A 45-year-old nulliparous woman attended for removal and replacement of a levonorgestrel-releasing intrauterine system (IUS) for continued management of dysmenorrhoea. I had placed the IUS some 6 years previously under a cervical block, needing to dilate the tight cervical canal for insertion. The patient’s periods had been well controlled. The IUS was easily removed but, as pictured, the arms ...

scour around bridge piers is one of the most important fields of hydraulic research. local scour around bridge piers and abutment is one of the main reasons of bridge failures. in the field of scour at the bridges, researches are more focus on scour of piers in compare with abutment. while the available information on the bridge failures required cost, the major problems are related to abutment...

An outstanding square slot element, for x-band wireless applications with asymmetric coplanar waveguide fed (CPW) is proposed. Various shapes of metallic strips are utilized as grounded stubs for providing Right Hand Circular Polarization (RHCP) functionality and wide-band properties. By adjusting the proposed stubs and hook-shaped radiator, length and positions, wider impedance band width is o...

disordered t-shaped graphene nanodevice (tgn) was designed and studied in this paper. we demonstrated the intrinsic transport properties of the tgn by using landauer approach. knowing the transmission probability of an electron the current through the system is obtained using landauer-buttiker formalism. the effects of single disorder on conductance, current and on the transport length scales a...

electrochemical properties of various rock-shaped-cuo/graphite (g) composites and monoclinic structure cuo nanoparticles as the cathode versus a zinc plate as the anode in a 4m naoh electrolyte were elucidated by electrochemical impedance spectroscopy (eis) and chronopotentiometry (cp) in a two electrode configuration cell. various values of g 9, 16 and 28 wt% were prepared and studied as catho...