Laboratory Section

Laboratory Communications in Acta Crystallographica Section F

EMBL Hamburg Outstation, c/o DESY, Notkestrasse 85, D-22603 Hamburg, Germany, and PO Box 6395, Lawrenceville, NJ 08648-0395, USA The last year has seen a number of enhancements to our still very young journal, Acta Cryst. F. There was, for instance, the introduction of a tool for creating interactive figures (Einspahr & Guss, 2008b) which can then be included in journal articles. The first Acta...

Navigation and Flight Mechanics Section at the Jet Propulsion Laboratory

The terminal navigation of the NEAR spacecraft during its close flyby of asteroid 253 Mathilde involved coordinated efforts first to determine the heliocentric orbits of the spacecraft and Mathilde and then to determine the relative trajectory of the spacecraft with respect to Mathilde. From ground-based optical observations alone, the error of Mathilde’s ephemeris at the time of encounter was ...

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Section] Section] Section] Section] Section] Section] Section] Section] Section] Section] 0 Estimating Performance Measures in Stochastic Cyclic Schedules

This paper reviews a cyclic scheduling model of repetitive manufacturing environments consisting of exible machines and multi-stage jobs. We explicitly model two system performance measures, throughput and ow time, while incorporating variability arising from uncertainty in operation processing times. We present an iterative approximation scheme to estimate the two moment behavior of our perfor...

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