Methods previously used to distinguish between water adsorbed on external surfaces and in the interlamellar space of Na-montmorillonite during adsorption and desorption of water vapor have been extended to a set of homoionic Li-, Na-, K-, Rb- and Cs-montmorillonite. The textural and structural features have been investigated at different stages of hydration and dehydration using controlled-rate thermal analysis, nitrogen adsorption volumetry, water adsorption gravimetry, immersion microcalorimetry and X-ray powder diffraction under controlled humidity conditions. During hydration, the size of the quasi-crystals decreases from 33 layers to 8 layers for Na-montmorillonite and from 25 layers to 10 layers for K-montmorillonite, but remains stable around 8–11 layers for Cs-montmorillonite. Each homoionic species leads to a one-layer hydrate, which starts forming at specific values of water vapor relative pressure. Li-, Na- and K-montmorillonite can form a two-layer hydrate. By comparing experimental X-ray diffraction patterns with theoretically simulated ones, the evolution of structural characteristics of montmorillonites during hydration or desorption can be described. Using structural and textural data, it is shown that during adsorption: (1) the rate of filling of interlamellar space of the one layer hydrate increases with the relative pressure but decreases with the size of the cations; and (2) the different hydrated states are never homogeneous.

Sappho, Xenophon: these two juxtaposed texts, chosen for their dissonant tones, well introduce the Greek representation of weaving as a privileged metaphoric terrain defining the presence and the essence of an imaginary feminine, often expressed in antithetical terms, as a polarized place, with an ever precarious equilibrium. As discourse, weaving is no longer a naturalistic depiction of an edifying occupation of the gynaeceum, an answer to the day-to-day realty of household tasks. As a literary object or ritualized activity, the loom appears as a “gendered” space, a place symbolic of feminine activity.

Evidence of chlorite weathering to halloysite appears to be limited. Trioctahedral ferruginous chlorite occurring in granitic rocks and in situ altered phases isolated from the horizons of two soils in southern Korea were studied by scanning and transmission electron microscope (SEM, TEM), chemical, and X-ray diffraction (XRD) techniques to determine the mechanism of alteration and nature of alteration products. Chlorites were entirely converted to halloysite, kaolinite, and Fe-oxyhydroxides in the thick Bt horizon. In the E and BC horizons, in addition to 1:1 silicate clays and Fe-oxyhydroxides, chlorite-like and intergradient vermiculite-kaolin minerals were also found. Total chemical analysis of chlorite flakes revealed losses of substantial amounts of Fe and Mg. Large parallel sets of galleries suggested extensive exfoliation and expansion of chlorite flakes. Tubular halloysite formed bridges between the walls of galleries. The SEM and TEM analyses showed very distinct coatings (0.2–0.3 μm thick) of Fe-oxyhydroxides above and below the surface of galleries that consisted of rounded, sub-rounded, elongated, ultramicrocrystalline particles (goethite and hematite). The 1:1 mineral species found in the thick Bt horizon had a tubular and crumpled lamellar morphology. The presence of Fe likely creates a misfit between tetrahedral and octahedral sheets and results in the morphology of the 1:1 clays observed under SEM and TEM. The presence of intergradient minerals between chlorite and 1:1-type clays in the surface and transitional BC horizon suggests that, in addition to losses of OH sheet -Fe and -Mg, the chlorite with mostly Al-octahedra is partly transformed to double 1:1 silicate clays and intergradient minerals.

This study characterizes various chemical and mineralogical properties of goethite and jarosite from a mine drainage environment using chemical extraction techniques, X-ray diffractometry (XRD), 57Fe Mössbauer spectroscopy and scanning electron microscopy (SEM). Goethite and jarosite precipitates were collected from leachate-contaminated soils and from groundwater samples that were stored for up to 3 y. The results indicate that the soil goethites have primarily microcrystalline morphologies with moderately large mean crystallite dimensions (MCD110 ∼ 40 nm), and are superparamagnetic at room temperature and magnetically ordered at 77 K. The substitution of Al for Fe in the goethites is less than 0.03 mol/mol, and there is consequently no measured contraction in the goethite unit cell volume. The jarosite unit cell dimensions, Mössbauer parameters and chemical compositions indicate that the precipitates are primarily well-crystallized K-Na-H3O solid solutions, although the presence of poorly crystalline H3O-rich jarosite is also identified in one sample.

The surface excesses of Na and Cl on synthetic imogolite and allophanes with varying Al/Si molar ratios in 0.10 M and 0.01 M NaCl solutions were determined using 22Na and 36Cl as ion probes. The point of zero net charge (PZNC) values ranged from 4.1 to 8.4, increasing with the Al/Si molar ratio for the allophanes, and was highest for imogolite (Al/Si = 2.01). The PZNC values were significantly lower than the point of zero charge (PZC) values previously determined by microelectrophoresis for the same material, indicating that Na resided within the shear plane to a greater extent than Cl. The PZNC values of allophanes were lower than their PZSE values, indicating that permanent charge existed in allophanes, and increased as Al/Si decreased. Conversely, the PZNC of imogolite was higher than its point of zero salt effect (PZSE) determined by potentiometric titration. Adsorption of Cl on imogolite from 0.1 and 0.01 M NaCl solutions below pH 8.4 and of Na from 0.1 M NaCl solutions between pH 5 and 8.4 exceeded the proton charge determined by potentiometric titration. There was no direct evidence of permanent charge in imogolite and excess Cl adsorption could not be entirely explained by simultaneous intercalation of Na and Cl. Isomorphic substitution of Al in tetrahedral sites was shown to increase with decreasing Al/Si by 27Al high-resolution solid-state nuclear magnetic resonance (NMR) spectra of allophanes, and was absent in imogolite. The chemical shifts of Al(4) and Al(6) were similar in allophanes (63.0–64.7 ppm and 6.1–7.8 ppm, respectively) and the chemical shift of Al(6) was 9.4 in imogolite.

This is a transcription of Jean d'Ormesson's speech at UNESCO at the 50th anniversary celebrations of Diogenes in 2003. He describes the journal's origins, inspirations and editors, and the unique place it occupies in the promotion of international, interdisciplinary scholarship.

The fall of the Communist regimes in the countries of Eastern Europe and the Soviet Union, and their commitment to social, political and economic reform, represent two aspects of a deep process of social transformation. As in all socio-political transformation which overturns the previous political and economic order, this process needed to develop an ideology and a concrete image of the future in order to mobilize their populations, to invent that certain political rationality which is indispensable for bringing reform to a successful conclusion, and to produce a certain coherence in the changes which occurred in the various fields of life in society. Unlike the preceding revolutions which had gradually nourished hopes for a better life and had expanded the horizons of human possibility with difficulty, movements towards democracy in the former Communist countries found an almost ready-made model.

My title is deliberately provocative. It is intended to give pause to all those - quite a few, I imagine - who are convinced that they owe nothing at all to religion in any shape or form and who, as a result, think they have lost nothing in the recent difficulties that have stripped the Christian churches of most of the hold they still retained over European society. Because it goes without saying, in today's thinking, that religion is a question of personal choice, individual participation and private belief. This is not the kind of religion I am talking about. The thesis I should like to advance is that, whatever our beliefs, church or degree of involvement, until quite recently all of us used to owe something to religion, and that we have all lost something in the enormous change which has carried us with it over the last thirty years and which, among other things, is currently completing its liquidation of the vestiges of religious organisation that remained among us. This something is directly related to the ‘dehumanisation of the world’ with which we are now so preoccupied.

2H NMR spectra of synthetic deuterated kaolinite have been collected in the temperature range from 150 K to 350 K. Hydroxyl groups show a Pake doublet pattern with an asymmetry factor of 0. They are almost fixed spatially, and undergo a wobbling motion with increasing temperature. The quadrupole coupling constant is 273 ± 3 kHz at 150 K, which indicates that interlayer hydrogen bonding is relatively weak.

The long-term impermeability of clay barriers in waste disposal facilities and hydraulic structures is of critical importance to environmental, agricultural, and industrial concerns. Changes in the oxidation state of Fe in the constituent clays of compacted clay barriers may degrade the hydraulic conductivity of these structures because other properties related to hydraulic conductivity, such as swelling, gel microstructure, and particle size, are greatly altered by the oxidation state. Two Na-saturated smectites (SWa-1 and API 25) were reduced by sodium dithionite (Na2S2O4), both in suspension and in situ after consolidation, to examine the effects of structural Fe reduction on hydraulic conductivity. Results indicated that the hydraulic conductivity depended on both the oxidation state and the consolidation history of the clay. The hydraulic conductivity of clay reduced in suspension before consolidation was lower than that of oxidized clay. Initially reduced smectite, thus, may be compactable to a less-permeable material with higher bulk density. But reduction of smectite in situ after consolidation increased the hydraulic conductivity and its variability. The oxidized state of clay liners should, therefore, be preserved.

This article explores the rehabilitation of the ethical dimension of human interactions with nature, using cross-cultural perspectives in Africa. Cross-cultural comparison of indigenous concepts of the relationship between people and nature with contemporary environmental and scientific issues facilitate the rehabilitation, renewal and validation of indigenous environmental ethics. Although increasing attention is being given to the environmental concerns of non-western traditions, most of the related research has centered on Asia, Native American Indians and Australian Aborigines with little attention being paid to Africa. However, this study has confirmed that, like other multicultural traditions, African indigenous traditions contain symbolic and ethical messages that are passed from generation to generation in order to ensure respect and compassion for other living creatures. The article shows, however, that not all indigenous knowledge is environmentally friendly. Indigenous and modern environmental ethics alike have something to teach as well as something to learn.

The chemical and the mineralogical composition of a group of pumiceous tuffs associated with recent salic volcanic episodes from Tenerife (Canary Islands) have been studied. The investigation focused on the two main types of pyroclastic deposits of the zone: ash-flows and ash-falls. The samples can be classified chemically as trachytic and phonolitic rocks with an intermediate silica content and a high percentage of alkali cations (Na+ and K+). The mineralogical composition, determined by X-ray diffraction, scanning electron microscopy, and optical microscopy, shows the occurrence of zeolites (mainly phillipsite, with lesser chabazite and analcime), associated with the parent glass. K-feldspar (sanidine) and calcite are accessory minerals. Zeolites are significantly more abundant in the ash-flow deposits. Zeolite formation by hydrothermal weathering in closed-system conditions varies according to the nature and the origin of the pyroclastic deposits. Tenerife phillipsites differ from typical diagenetic, lacustrine, and deep-sea phillipsites, both in chemical and mineralogical features. Alkali cations exceed divalent cations in the unit-cell that, assuming a monoclinic symmetry, has the following parameters: a = 8.46–10.55 Å, b = 14.21–14.40 Å, c = 7.80–8.70 Å, and β = 105°–110°.

The study of the post-Communist towns of East Europe and Russia does not only present the social sciences with the opening of a new field and the attraction of exoticism close at hand. They are a remarkable observatory of the complex relations which unite the material facets of urban life (extension of the built-up area, architectural forms, types of distribution of infrastructures and services) and the social structures (mode of government, nature of the economic initiative, expressions of sociability). In three-quarters of a century for Russia, in fifty years for the countries of East Europe, cities many ages old were to have two changes of system: from liberal industrial capitalism to the controlled Communist economy, from interventionist autarchy to the globalized market. To give the lie to the poet (Baudelaire), towns change no faster than the hearts of mortals but beat to the rhythm of their continuities, their aspirations and their dreams.

There are as many authors as there are forms of shamanism, and as many points of view on the subject as there are authors. The fact that there is no consensus on the definition of the term shamanism is probably neither accidental nor much of a disadvantage. Is not a certain amount of vagueness appropriate to a phenomenon marked by so much diversity and vitality? For that reason, would it not be more profitable to focus the investigation of the term on the ultimate limits of its applicability? Primitive, shamanism continues to be reborn. Rooted in nature, it has blossomed in great industrial cities. Animistic, it has enriched the popular foundation of the great religions without modeling its own practices on them. Instead, shamanism has sometimes manifested itself in grand recurring rituals that celebrate ethnic identity; at other times, it has been an instrument used by private individuals to channel the course of events in a direction favorable to them or, more often, to make sure that their course is not unfavorable. To someone suffering from a psychic burden, shamanism can represent a priceless instrument that will offer relief, or help in being reassimilated into the community. For the expert practitioner, shamanism can be a means to personal advancement. Even when scorned by all and, in some cases, combated, shamanism has found a way to adapt itself everywhere.

This paper analyses certain contemporary narratives among Buryats of Russia and China. At issue is the nature of responsibility for the campaigns of terror, in particular the devastation of the Buddhist church in the 1930s. In these accounts political leaders appear as reincarnations, destined to unleash terrible events. Stalin, for example, is said by Buryat Mongol villagers to have been the reincarnation of a Blue Elephant which lived in ancient times in India. I examine local discussions around these stories to suggest that the narrators, themselves having been caught up in the seemingly objective and transparent, yet deeply irrational, accounts of the Party-State, do not (at any rate at present) confront actions in which they were both perpetrators and victims ‘matter-of-factly’. Having been a particular target of the Stalinist all-pervasive organisation of suspicion and punishment, Buryat Buddhists today are creating ‘paranoid narratives’ of their own to explain the repressions - a narrative of displacement, in which the actions attributed to an other (in this case Stalin) are in some way ‘about’ oneself. The reincarnation stories point up the crucial moral issue erased by socialist metahistory, the ethical problem of individual accountability. They are about complicity, for they reveal an uneasy, and probably unconscious, identification with Stalin.

The third sex, which for a long period of history meant the androgyne and the homosexual, took on a new sense around 1900, when it was applied to emancipated women, who were featured by novelists and analysed by psychiatrists. Assimilated with lesbians, ‘desexualized’ by their modern way of life, they were labelled ‘neuter’, worker bees in a hive-state where ‘female-male’ markers were tending to disappear. Neither men in sex, nor women in gender (at least according to traditional assumptions), they constituted a new ‘battalion’ which highlighted all the anxieties of the time: the involution of dimorphism, the threat of lack of differentiation and the ‘extinction of the race’. But for those who accepted the label, neuterdom evolved from a pejorative concept into an instrument of a kind of liberation and the strategic means to set up creative space cleared of sexual stigma, until political cooption, aware of the resurgence of a ‘superior species’, changed its meaning and tipped over into the worst sort of excess.