We consider the task of designing a truthful auction mechanism for CPU time scheduling problem. There are m commodities (time slots) T = {t1, t2, . . . , tm} for n buyers I = {1, 2, . . . , n}. Each buyer requires a number of time slots si for its task. The valuation function of buyer i for a bundle of time slots Ti is vi(Ti) = wi(m− t), where t is the last time slot in Ti and |Ti| = si. The ut...

Carbon nanotubes (CNTs) were prepared by the catalytic chemical vapor deposition of C2H2 at 550°C in 120 minutes using nanoparticles of Ni-Ce-Zr mixed oxides. The CNTs were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), high resolution transmission electron microscopy (HRTEM) and Raman spectroscopy. The results revealed that CNTs with diameter of about 45 nm are o...

With the concept of digital factory, a research including experiment, kinetic Monte Carlo simulation, and ab initio calculation has been conducted to investigate the basic structure and the formation mechanism of Ti-Si-N superhard nanocomposite coatings. In sputtering PVD process, ion mass spectra and deposition rates have been measured. The measurement results show that the Ti-Si-N deposition ...

A hybrid carbide ultra-high temperature ceramics matrix [(Hf,Ti)C-SiC] reinforced with BN-coated carbon fibres was fabricated and tested for surface oxidation resistance. The UHTC composite showed an average mass ablation rate of 0.0014 g/s after exposure to a high heat flux (∼17 MW/cm2) oxyacetylene flame test 30 s above 2500 °C. cross-sectional profile the oxides scale formed characterised an...

The influence of V content on the morphology, structure, hardness (H) and reduced Young's modulus (E), adhesion, oxidation resistance TiAlSiN coatings is investigated. were produced by DC reactive magnetron sputtering, with increasing contents from 0, 4.8 11.0 at.%. All exhibit a fcc type structure. coating at.% shows highest values H E, whereas are similar for reference V. adhere well to subst...

Our density functional theory study of hydroperoxy (OOH) intermediates on various model titanosilicalite (TS-1) Ti centers explores how microstructural aspects of Ti sites effect propylene epoxidation reactivity and shows that Ti sites located adjacent to Si vacancies in the TS-1 lattice are more reactive than fully coordinated Ti sites, which we find do not react at all. We show that propylene...

In this case study, 2D micro energy dispersive X-ray fluorescence (µ-EDXRF) surveys were performed in the nepheline syenite (NS) of “Serra de Monchique” located southwest region Portugal (Algarve, Iberian Peninsula). The results allow identification mineral matrix certain elements classified as critical raw materials (CRMs). Due to substitution effects, some scarce transition elements, such Zn ...