BEYOND COMPARISON: HISTOIRE CROISÉE AND THE CHALLENGE OF REFLEXIVITY1

This article presents, in a programmatic way, the histoire croisée approach, its methodological implications and its empirical developments. Histoire croisée draws on the debates about comparative history, transfer studies, and connected or shared history that have been carried out in the social sciences in recent years. It invites us to reconsider the interactions between different societies or cultures, erudite disciplines or traditions (more generally, between social and cultural productions). Histoire croisée focuses on empirical intercrossings consubstantial with the object of study, as well as on the operations by which researchers themselves cross scales, categories, and viewpoints. The article first shows how this approach differs from purely comparative or transfer studies. It then develops the principles of pragmatic and reflexive induction as a major methodological principle of histoire croisée. While underlining the need and the methods of a historicization of both the objects and categories of analysis, it calls for a reconsideration of the way history can combine empirical and reflexive concerns into a dynamic and flexible approach.     

Conservatives,the Constitution and the Quest for a ‘Representative’ House of Lords, 1911–35*

This article presents a new interpretation of Conservative attitudes towards house of lords' reform in the early 20th century. Coinciding, as it did, with the introduction of universal adult suffrage, the campaign to reform and strengthen the second chamber has traditionally been understood as a reaction against democracy. Conversely, this article, emphasizing the politics rather than policies of reform, argues that many Conservatives sought to establish a legitimate role for a second chamber within the new democratic settlement and that the campaign for reform is, consequently, better understood as a constitutional means of ‘making safe’, rather than resisting, mass democracy. The account sheds new light on how the impulse behind reform was frequently rooted in a commitment to democracy, how reform commanded the support of a wide cross section of the Conservative parliamentary party, and why the reform campaign had folded by the early 1930s. In doing so, it reframes an important episode that helped close the long‐19th‐century tradition of constitutional reform in British politics.     

Pour une localisation optimale des centres de transbordement intermodaux entre réseaux de transport: formulation et extensions

La localisation des centres de transbordement où s'opère le changement de mode ou de réseau de transport intervient de façon déterminante dans la compétitivité du transport multimodal. L'objet de cette contribution est de discuter cette problématique en l'envisageant sous l'angle particulier de la théorie de la localisation. Ainsi, la localisation de centres de transbordement entre réseaux est définie comme un problème de type discret qui cherche à localiser des unités (équipements techniques) permettant le transfert dun réseau à un autre avec pour objectif de réduire les coûits de transport totaux. Une formulation mathématique de ce problème, reposant sur de la programmation linéaire en nombres entiers, est proposée et argumentée. La souplesse de cette formulation autorise plusieurs extensions qui peuvent être combinées de manière à représenter diverses situations rencontrées dans la pratique.     

The Design and Development of a Closed Chamber for the in‐situ Quantification of Dryland Soil Carbon Dioxide Fluxes

This paper describes the design features and capabilities of a portable automated in‐situ closed chamber (ISCC) for the quantification of CO₂ fluxes in dryland soils where both photosynthetic and respiratory components may be associated with a cyanobacterial crust. The processes of CO₂ flux in dryland soils are briefly described in order to clarify the conditions that make quantification of these fluxes problematic. The instrumentation currently available for in‐situ soil CO₂ flux measurements is then reviewed demonstrating their inadequacies for the dryland environment. The ISCC described here is a member of the closed or enrichment class of soil respiration chambers. The ISCC, however, features an optical window possessing high (>90%) transmission in the photosynthetic active region (PAR) of the solar irradiance spectrum, permitting observations of photosynthesis. The ISCC possesses automatic venting and purging so that gaseous concentrations inside the chamber do not change from ambient sufficiently to significantly affect diffusion. The ISCC features both active and passive cooling employing internal solid‐state Peltier coolers and external aluminised Mylar respectively. This avoids severe disturbance of the microclimate within the chamber due to admission of high fluxes of PAR and permits in‐situ operation under a wide range of ambient field temperatures (~ ?5 to 40°C). Sensors internal to the chamber monitor temperature, relative humidity, irradiance and pressure. In this implementation the ISCC is coupled to a portable gas chromatograph (Agilent GC‐3000) to sample the chamber atmosphere. Indicative data for Kalahari Sand soils of Botswana are presented as an illustration of the general performance characteristics.