Recall from last time that we are working towards a 2-approximation algorithm for 1|prec|∑wjCj. We will focus on initial sets S, which have the property that if j ∈ S and k → j then k ∈ S. We defined ρ(S) = w(S) p(S) , and S ∗ to be an initial set with maximum ρ(S) over all initial sets S. Our algorithm finds S∗, finds a 2-approximate schedule for S∗ respecting precedence constraints, and then ...

The oxidation of n-butane at elevated pressures has been investigated by experiments in a laminar flow reactor 100 bar and temperatures 450–900 K. onset temperature for reaction increased from 550 K under oxidizing conditions (Φ = 0.02) to 625 reducing 13). NTC behavior was observed 600–650 625–675 1.0). A detailed chemical kinetic model the established. present those suggested literature were ...

The present state of melting techniques for IN7 18 and IN625 has well-defined limitations both in terms of the ingot structure and maximum ingot size which is fabricable by the various processes. Although there are methods already in industrial use which would extend both of these limits, since the alloys must be produced at a relatively low cost here are further limitations on the practical ma...

We report an analysis of the archival Rossi X-ray Timing Explorer (RXTE) data from the December 2004 hyperflare from SGR 1806-20. In addition to the ≈ 90 Hz QPO first discovered by Israel et al., we report the detection of higher frequency oscillations at ≈ 150, 625, and 1,840 Hz. In addition, we also find indications of oscillations at ≈ 720, and 2,384 Hz, but with lower significances. The 150...

OBJECTIVES The objective of this study is to investigate the effects of Salviae Miltiorrhizae Radix hot aqueous extract on nitric oxide (NO) and prostaglandin E2 (PGE2 ) production and on 1,1-diphenyl-2-picryl hydrazyl (DPPH) free-radical scavenging in macrophages. METHODS Salviae Miltiorrhizae Radix(300 g) was heated at 100℃ with distilled water (2 L) for 4 hours. The extract was filtered an...