Waste collection routing-limited multiple landfills and heterogeneous fleet

This article deals with a real-life waste collection routing problem. To efficiently plan waste collection, large municipalities may be partitioned into convenient sectors and only then can routing problems be solved in each sector. Three diverse situations are described, resulting in three different new models. In the first situation, there is a single point of waste disposal from where the vehicles depart and to where they return. The vehicle fleet comprises three types of collection vehicles. In the second, the garage does not match any of the points of disposal. The vehicle is unique and the points of disposal (landfills or transfer stations) may have limitations in terms of the number of visits per day. In the third situation, disposal points are multiple (they do not coincide with the garage), they are limited in the number of visits, and the fleet is composed of two types of vehicles. Computational results based not only on instances adapted from the literature but also on real cases are presented and analyzed. In particular, the results also show the effectiveness of combining sectorization and routing to solve waste collection problems.

Electromagnetism based approach to Sector design in Waste Collection

For efficient planning of waste collection routing, large municipalities may be partitioned into convenient sectors. The real case under consideration is the municipality of Monção, in Portugal. Waste collection involves more than 1600 containers over an area of 220 km2 and a population of around 20,000 inhabitants. This is mostly a rural area where the population is distributed in small villages around the 33 boroughs centres (freguesia) that constitute the municipality. In most freguesias, waste collection is usually conducted 3 times a week. However, there are situations in which the same collection is done every day. The case reveals some general and specific characteristics which are not rare, but are not widely addressed in the literature. Furthermore, new methods and models to deal with sectorization and routing are introduced, which can be extended to other applications. Sectorization and routing are tackled following a three-phase approach. The first phase, which is the main concern of the presentation, introduces a new method for sectorization inspired by Electromagnetism and Coulomb’s Law. The matter is not only about territorial division, but also the frequency of waste collection, which is a critical issue in these types of applications. Special characteristics related to the number and type of deposition points were also a motivation for this work. The second phase addresses the routing problems in each sector: new Mixed Capacitated Arc Routing with Limited Multi-Landfills models will be presented. The last phase integrates Sectoring and Routing. Computational results confirm the effectiveness of the entire novel approach.

A private library in the Mateus Palace (Vila Real). The D. Luís António de Sousa Botelho Mourão (1722-1798) Books Collection

Fundação para a Ciência e Tecnologia no âmbito de Bolsa de Doutoramento (SFRH/BD/86280/2012)

Handheld-assisted field data collection for occupational risk assessment.

A computerized handheld procedure is presented in this paper. It is intended as a database complementary tool, to enhance prospective risk analysis in the field of occupational health. The Pendragon forms software (version 3.2) has been used to implement acquisition procedures on Personal Digital Assistants (PDAs) and to transfer data to a computer in an MS-Access format. The data acquisition strategy proposed relies on the risk assessment method practiced at the Institute of Occupational Health Sciences (IST). It involves the use of a systematic hazard list and semi-quantitative risk assessment scales. A set of 7 modular forms has been developed to cover the basic need of field audits. Despite the minor drawbacks observed, the results obtained so far show that handhelds are adequate to support field risk assessment and follow-up activities. Further improvements must still be made in order to increase the tool effectiveness and field adequacy.

Catalogue des Tableaux modernes... tableaux anciens, objets d'art... oeuvres d'art du Japon et de la Chine... provenant de la collection V. (Vitta) Vente Hotel Drouot les 27 et 28 juni 1924

[Vente (Art). 1924-06-27 - 1924-06-28. Paris]

Collection des cartulaires de France ; 4-7. Cartulaire de l'église Notre-Dame de Paris. Série 1,Tome 2 / publ. par M. Guérard,... ; avec la collab. de MM. Géraud, Marion et Deloye

[Cartulaire. Paris, Cathédrale Notre-Dame. 1850]

Collection des cartulaires de France ; 4-7. Cartulaire de l'église Notre-Dame de Paris. Tome 4,Tome 1,Tome 4 / publ. par M. Guérard,... ; avec la collab. de MM. Géraud, Marion et Deloye

[Cartulaire. Paris, Cathédrale Notre-Dame. 1850]

Collection des lois de la république française...

[Acte]

Collection complète des mémoires relatifs à l'histoire de France. T. XIII

Comprend : Mémoires de Jean de Roye

Catalogue d'une importante collection de vignettes par ou d'après Borel, Choffard, Eisen, Gravelot, Lebarbier, Marillier, Monnet, Moreau le jeune, Queverdo et autres, Portraits des XVIe, XVIIe et XVIIIe siècles, Estampes, dessins des XVIIIe et XIXe siècles, autographes, suites de figures, composant la collection de Mr H. de G. La vente aura lieu du lundi 27 février au mercredi 8 mars 1893... 28 rue des Bons-Enfants... / Me Maurice Delestre, commissaire-priseur ; [expert] M. Ch. Porquet, libraire, M. P. Roblin, marchand d'estampes

[Vente. Art. 1893-02-27 - 1893-03-08. Paris]

Catalogue d'une belle collection de tableaux, estampes et desseins, provenans de la vente du Prince de Rubempré faite à Bruxelles, & dont la vente se fera à Paris dans le courant du mois de juin 1765...

[Vente (Art). 1765-06-00. Paris]

Cabinet choisi ou catalogue d'une collection de livres fort curieuse en toutes sortes de facultés & langues. Dont la vente se fera à l'amiable lundi 21 mars 1768 & jours suivans depuis huit heures du matin jusqu'au soir. Les prix seront marqués sur chaque livre

[Catalogue de libraire. Paris. Davidts, Rombault. 1768]

A magnificient collection of manuscripts formed by a gentleman of consummate taste and judgment... : Sotheby, 7 juin 1876

[Vente. Livres. 1876-06-07. Londres]