Ambiance, Structure, Et Stratégie: Recherche Sur L'Appréciation Du Paysage Forestier Par Les Campeurs

L'utilisation efficace des espaces consacrés aux loisirs et l'optimalisation de la satisfaction des usagers exigent la compréhension des relations entre ceux-ci et leur environnement. Cet article explore les liens entre 1'attraction d'un site de camping en milieu forestier et I'ambiance qui y règne. On montre d'abord comment cette notion d'ambiance peut-être mise en ceuvre à travers le concept écologique de structure de la végétation forestière. L'étude montre ensuite le rôle important que jouent ces caractéristiques structurelles dans le choix d'un site pour l'usager. Ce choix est le résultat de stratégies qui, tout en s'adaptant aux particularités du milieu, visent la satisfaction de certaines préférences fondamentales du campeur.
The most efficient use of a recreational area as well as the optimization of user satisfaction require the elucidation of the relationships between recreationists and their environment. This article investigates the links between the attractiveness of camping sites in a forest environment and the ambiance which characterizes these sites. It is first shown how the notion of ambiance can be operationalized through the ecological concept of forest structure. Then the study points out the role of this structural dimension of a forest environment as a factor of the user's choice. This choice results from strategies which are aimed at the satisfaction of some of the camper's fundamental preferences while, at the same time, being adapted to environmental characteristics.     

Machiavélisme et Staats-Raison au XVIIIe siècle d’après L’Universal-Lexikon de Zedler

This article examines the manner in which the Grosses vollständiges Universal-Lexikon published by Johann Heinrich Zedler from 1732 to 1750 and considered as the most important german language encyclopedia of its time, welcomes and restructures the classical doctrine of the reason of State. Contrary to the interpretation in which the concept of the State developed by the Lexikon would fit into a pure jusnaturalistic logic, it shows the permanence, parallel to wolffian natural law, of a prudential tradition of political thought. The Lexikon, a contemporary of the Anti-Machiavel of Frederic II, thus appears to be the faithful mirror of the heterogeneous tendencies which then illustrate the field of the problems in the reason of State.     

The settlement patterns of north-eastern and south-eastern Arabia in late antiquity

The east Arabian settlements in antiquity were never large urban sites. However, they were the main centres of the communities that inhabited that area, interfacing between the nomadic and sedentary societies. A study of the distribution and characteristics of these sites reveals different, complementary functions. They were organized in local networks forming the essential structure of the settlement pattern and delineating the territories of communities having their own political identity.     

Modeling Air Quality in Urban Areas: A Cell‐Based Statistical Approach

Statistical regression models are presented that explain the observed variations, across urban areas, in the concentrations of two major pollutants, ozone and carbon monoxide. Model specification and estimation are based on an explicit and new spatial framework derived from the theoretical concept of well‐mixed cells, whereby the basic Fickian system of diffusion equations is integrated over the regional space partitioned into a grid of large cells. The concentration in each cell results from the balance of pollutant flows into and out of this cell and of pollutant emissions and removal within that cell, and is expressed as the sum of two concentration contributions: (1) the local effect, dependent upon pollution‐related factors around the measuring station, and (2) the regional effect, dependent upon pollutant flows originating outside the local area. A large database is developed, making extensive use of GIS technology, to spatially relate such data as pollution measurements, meteorological factors, land‐use characteristics, census socioeconomic data, and major highway network characteristics. The results confirm the appropriateness of the well‐mixed cell framework, are in line with general knowledge regarding the determinants of ozone and carbon monoxide concentrations, and clarify the role of transportation, residential fuel use, economic activities, natural environments, and meteorological factors such as temperature and solar radiation. About SO percent of the variations in concentrations are explained by these models. Several areas of further research are outlined.     

Transition From Wild to Domesticated Pearl Millet (Pennisetum glaucum) Revealed in Ceramic Temper at Three Middle Holocene Sites in Northern Mali

Imprints of domesticated pearl millet (Pennisetum glaucum (L.) R. Br.) spikelets, observed as temper in ceramics dating to the third millennium BC, provide the earliest evidence for the cultivation and domestication process of this crop in northern Mali. Additional sherds from the same region dating to the fifth and fourth millennium BC were examined and found to have pearl millet chaff with wild morphologies. In addition to studying sherds by stereomicroscopy and subjecting surface casts to scanning electron microscopy (SEM), we also deployed X-ray microcomputed tomography (microCT) on eleven sherds. This significantly augmented the total dataset of archaeological pearl millet chaff remains from which to document the use of the wild pearl millet as ceramic temper and the evolution of its morphology over time. Grain sizes were also estimated from spikelets preserved in the ceramics. Altogether, we are now able to chart the evolution of domesticated pearl millet in western Africa using three characteristics: the evolution of nonshattering stalked involucres; the appearance of multiple spikelet involucres, usually paired spikelets; and the increase in grain size. By the fourth millennium BC, average grain breadth had increased by 28%, although spikelet features otherwise resemble the wild type. In the third millennium BC, the average width of seeds is 38% greater than that of wild seeds, while other qualitative features of domestication are indicated by the presence of paired spikelets and the appearance of nondehiscent, stalked involucres. Nonshattering spikelets had probably become fixed by around 2000 BC, while increases in average grain size continued into the second millennium BC. These data now provide a robust sequence for the morphological evolution of domesticated pearl millet, the first indigenous crop domesticated in western Africa.

     

Study of interactions between polyethylene glycol and archaeological wood components by C high-resolution solid-state CP-MAS NMR

While use of polyethylene glycols, PEG, polymers for archaeological wood conservation has been well established, there is almost no study of such composite materials with carbon thirteen high-resolution solid-sate NMR. We demonstrate that NMR is an useful analytical tool to characterize rapidly samples of conserved wooden objects. By choosing an appropriate value of the contact time (from 3 to 5 ms) for which the PEG component gives only a small residual NMR signal in the CP-MAS experiment, it is possible to edit selectively the spectra of the wood components. It allows one to visualize the degradation extent of the archaeological wood even when the conservation processes have been already applied. Moreover, by studying the kinetics of CP-MAS experiments, the time constants, T_1ρH and T_CH values for PEG moiety were computed. From these data, it is shown that either in the crude commercial product or in incorporated in archaeological woods, two components are present and they are the signatures of crystalline (or ordered) and amorphous (or disordered) molecular domains. Moreover, it was shown in the archaeological woods that almost 30% of PEG was in close molecular interactions with lignins. This study is the first evidence that the PEG in conserved wood can interact at a molecular level with wood components. It also demonstrates that the PEG diffuses inside the residual cell walls of archaeological wood. This data are important for scientists in charge of process development for the conservation of wooden artifacts.     

Middle Stone Age Bifacial Technology and Pressure Flaking at the MIS 3 Site of Toumboura III,Eastern Senegal

African Archaeological Review - Over the past decade, the increasing wealth of new archaeological data on the Middle Stone Age (MSA) in Senegal and Mali has broadened our understanding of...