Non-pareille? Issues in Modern French Photo-Essayism

[FIRST PARAGRAPH][L]’esthéthique sait depuis longtemps que l’image, contrairement à ce que croit et fait croire la machine d’information, montre toujours moins bien que les mots toute grandeur qui passe la mesure: horreur, gloire, sublimité, extase. (Comolli and Rancière 1997, 66) It may seem odd, in a general analysis of the modern French essay accompanying photography, that there is no reproduction of photographs. This is however a deliberate choice, and not one without precedent, as the collection of Michel Butor’s photo-essays into one photo-less volume shows. For it would seem in this age of the image – dubbed by essayists as diverse as Debray (1992), Flusser (2000 [1983]), Gervereau (2000), Glissant (1994) as the televisual era – the written word has tended to be downplayed. This is no more the case than in the photo-essay, a sub-genre largely overlooked and under-theorised, generally subsumed within photo-journalism, and in which photographic sequences are preferred to written text (see Mélon, in Baetens and Gonzalez 1996, 138–55)

Non-pareille? Issues in Modern French Photo-Essayism

[FIRST PARAGRAPH][L]’esthéthique sait depuis longtemps que l’image, contrairement à ce que croit et fait croire la machine d’information, montre toujours moins bien que les mots toute grandeur qui passe la mesure: horreur, gloire, sublimité, extase. (Comolli and Rancière 1997, 66) It may seem odd, in a general analysis of the modern French essay accompanying photography, that there is no reproduction of photographs. This is however a deliberate choice, and not one without precedent, as the collection of Michel Butor’s photo-essays into one photo-less volume shows. For it would seem in this age of the image – dubbed by essayists as diverse as Debray (1992), Flusser (2000 [1983]), Gervereau (2000), Glissant (1994) as the televisual era – the written word has tended to be downplayed. This is no more the case than in the photo-essay, a sub-genre largely overlooked and under-theorised, generally subsumed within photo-journalism, and in which photographic sequences are preferred to written text (see Mélon, in Baetens and Gonzalez 1996, 138–55)

Predicting in situ heat pump performance: An investigation into a single ground-source heat pump system in the context of 10 similar systems

Ten similar ground-source heat pump systems installed in small rural social housing bungalows in the UK have been monitored in detail over a period of more than one year. The purpose of the present work was to take one system at random, and study its performance characteristics in the context of the group, in order to explore the potential for predicting performance from a few readily obtainable parameters. The chosen system performed relatively well in summer and relatively poorly in winter (despite an average temperature lift for space-heating). This was found to be readily explicable in terms of domestic hot water set-point temperature, and compressor cycling behaviour. The latter may be affected by building fabric issues, or by user behaviour (e.g. window-opening). The study suggests that where sizeable groups of similar systems are installed in similar buildings (e.g. by social housing providers), an appropriate monitoring strategy may be to monitor a sample of installations in detail, and to predict the performance of the remainder based on limited but more easily obtained data. However, the limited dataset may need to include internal and ground-loop fluid temperatures, heat pump electricity consumption, and some detailed knowledge of building fabric and occupier practices

Comment on "Density Functional Simulation of a Breaking Nanowire"

In a recent Letter, Nakamura et al. [Phys. Rev. Lett. 82, 1538 (1999)] described first principles calculations for a breaking Na nanocontact. Their system consists of a periodic one-dimensional array of supercells, each of which contains 39 Na atoms, originally forming a straight, crystalline wire with a length of 6 atoms. The system is elongated by increasing the length of the unit cell. At each step, the atomic configuration is relaxed to a new local equilibrium, and the tensile force is evaluated from the change of the total energy with elongation. Aside from a discontinuity of the force occuring at the transition from a crytalline to an amorphous configuration during the early stages of elongation, they were unable to identify any simple correlations between the force and the number of electronic modes transmitted through the contact. An important question is whether their model is realistic, i.e., whether it can be compared to experimental results obtained for a single nanocontact between two macroscopic pieces of metal. In this Comment, we demonstrate that with such a small unit cell, the interference effects between neighboring contacts are of the same size as the force oscillations in a single nanocontact.Comment: 1 pag

Many-body theory of electronic transport in single-molecule heterojunctions

A many-body theory of molecular junction transport based on nonequilibrium Green's functions is developed, which treats coherent quantum effects and Coulomb interactions on an equal footing. The central quantity of the many-body theory is the Coulomb self-energy matrix $\Sigma_{\rm C}$ of the junction. $\Sigma_{\rm C}$ is evaluated exactly in the sequential tunneling limit, and the correction due to finite tunneling width is evaluated self-consistently using a conserving approximation based on diagrammatic perturbation theory on the Keldysh contour. Our approach reproduces the key features of both the Coulomb blockade and coherent transport regimes simultaneously in a single unified transport theory. As a first application of our theory, we have calculated the thermoelectric power and differential conductance spectrum of a benzenedithiol-gold junction using a semi-empirical $\pi$-electron Hamiltonian that accurately describes the full spectrum of electronic excitations of the molecule up to 8--10eV.Comment: 13 pages, 7 figure