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1.
Grosnick D Wright SC Bolton RD Cooper MD Frank JS Hallin AL Heusi PA Hoffman CM Hogan GE Mariam FG Matis HS Mischke RE Piilonen LE Sandberg VD Sanders GH Sennhauser U Werbeck R Williams RA Wilson SL Hofstadter R Hughes EB Ritter MW Highland VL McDonough J 《Physical review letters》1986,57(26):3241-3244
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Providers of logistic services in recent years are under a big pressure to lower their expenses. One way to accomplish this
task is centralization of logistic activities. This creates a distribution centers with a large number of customers. The capacity
or time of one delivery person is limited, but, at the same time, it usually serves many customers. This problem is often
called a Street Routing Problem (SRP). This paper is a survey of aggregation heuristics that can be used for a solution of
Very Large SRP (VLSRP). Performance of heuristics has been evaluated based on real data. This paper presents several approximations
of length for a SRP with mixed transportation mode and compares them with published approximations used for Vehicle Routing
Problem (VRP) or Traveling Salesman Problems (TSP). The method was tested in seven real world instances ranging from 11000
to 29000 customers. Several aggregation methods including two new are presented and compared for the creation of delivery
districts. New measurements for the quality of aggregation are created and tested on real data with all discussed aggregation
methods. 相似文献
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Martin Lehmann Anastasios I. Zouboulis Kostas A. Matis Andreas Grohmann 《Mikrochimica acta》2005,151(3-4):269-275
In the course of researching methods of sampling and monitoring toxic metals (as arsenic ions) in water and wastewaters, we
selected the use of sorption for in-depth examination. Among other things, sorption modelling was investigated by the mechanism
of surface complexation in order to describe the process or even predict the outcome for the expected rate, and in general,
to develop this detection technique for pollutants. This investigation will include the application of goethite mineral as
the suitable metal ion sorbent and the use of appropriate computer software. The relative thermodynamic aqueous speciation
of the solution, in similar experimental conditions, was also studied. 相似文献
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In many generic combustion models, one finds that a combustionwave will develop with a specific wave speed. However, thereare possible initial temperature profiles which do not evolveinto such waves, but rather die out to the ambient temperature.There can exist, in some models, a clear distinction betweenthose initial conditions that do evolve into combustion wavesand those that do not; this is sometimes referred to as thewatershed initial condition. When fuel consumption is consideredto be negligible, analytical methods can be used to obtain theexact watershed. In this paper, we consider the problem of determiningpseudo-watersheds and ascertaining the relationship betweenthese pseudo-watersheds and the exact watersheds. In the processa novel weight-function approach for infinite spatial domainsis developed. 相似文献
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Wang S Albergo S Bieser F Brady FP Caccia Z Cebra DA Chacon AD Chance JL Choi Y Costa S Elliott JB Gilkes ML Hauger JA Hirsch AS Hjort EL Insolia A Justice M Keane D Kintner J Lisa MA Matis HS McMahan M McParland C Olson DL Partlan MD Porile NT Potenza R Rai G Rasmussen J Ritter HG Romanski J Romero JL Russo GV Scharenberg RP Scott A Shao Y Srivastava BK Symons TJ Tincknell ML Tuvè C Warren PG Weerasundara D Wieman HH Wolf KL 《Physical review letters》1995,75(14):2646-2649
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