Time-optimal rendezvous for elliptic orbits

Time optimal rendezvous trajectories for variable thrust intercepting and orbiting space vehicle

Moving Nigeria’s Project Procurement System to Best Value: A Prescription

A new sustainable and best value procurement initiative suitable for use in developing countries has been developed.  The procurement system, the Performance Information Procurement System (PIPS) was developed in the United States (US), and has been tested in Botswana and recently in India.  PIPS not only stabilizes the procurement system, it transfers the risk and control to contractors who must act in the best interest of the client.  The transparency, accountability, and risk management orientation of the PIPS structure disengages relationships, inaccurate expectations, and bureaucratic and political actions.  The strength of PIPS includes minimizing the need for professionals representing the client to make decisions, direct, and control contractors.  PIPS has been tested for 20 years in the US, with 98% performance on over 600 projects.  Recent tests outside of construction reveal that the efficiency of PIPS can minimize up to 50% of the procurement transaction costs. We hypothesized that paradigm shift from the low-bid or price-based procurement to the best value procurement through the application of PIPS technology is a potential panacea capable of extricating corruption, collusion, fraud, bid rigging, ethical violations and negative headlines from developing countries’ procurement environment rather than advancing measures that only scratches the problems on the surface. We infer that a adoption of a new initiative in best value procurement using PIPS technology can revolutionize the procurement environment in Nigeria in particular and the developing countries as a whole. Keywords: Best value, public project procurement, Performance Information Procurement System (PIPS), sustainable consumption, developing countries, Nigeria

Evidence for Carrier-Induced High-Tc Ferromagnetism in Mn-doped GaN film

A GaN film doped with 8.2 % Mn was grown by the molecular-beam-epitaxy technique. Magnetization measurements show that this highly Mn-doped GaN film exhibits ferromagnetism above room temperature. It is also revealed that the high-temperature ferromagnetic state is significantly suppressed below 10 K, accompanied by an increase of the electrical resistivity with decreasing temperature. This observation clearly demonstrates a close relation between the ferromagnetism with extremely high-Tc and the carrier transport in the Mn-doped GaN film.Comment: 9 pages, 3 figure

A test of the Feynman scaling in the fragmentation region

The result of the direct measurement of the fragmentation region will be presented. The result will be obtained at the CERN proton-antiproton collider, being exposured the Silicon calorimeters inside beam pipe. This experiment clarifies a long riddle of cosmic ray physics, whether the Feynman scaling does villate at the fragmentation region or the Iron component is increasing at 10 to the 15th power eV

Allograft and Xenograft Acceptance under FK‐506 and Other Immunosuppressant Treatment

We will focus on two issues, both involving, but not confined to FK-506: first, the meaning of the graft acceptance, which is, after all, the objective of immunosuppression for the transplant surgeon; and second, how to take the next great step of xenotransplantation

Electron transfer via helical oligopeptide to laccase including chiral schiff base copper mediators

The oxygen reduction efficiency of a laccase-modified electrode was found to depend on the chirality of the oligopeptide linker used to bind the enzyme to the surface. At the same time, the electron transfer between the cathode electrode and the enzyme is improved by using a copper(II) complex with amino-acid derivative Schiff base ligand with/without azobenzene moiety as a mediator. The increased electrochemical current under both O2 and N2 proves that both the mediators are active towards the enzyme