摘要 :
This essay seeks to reframe recent debates on sociospatial theory through the introduction of an approach that can grasp the inherently polymorphic, multidimensional character of sociospatial relations. As previous advocates of a ...
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This essay seeks to reframe recent debates on sociospatial theory through the introduction of an approach that can grasp the inherently polymorphic, multidimensional character of sociospatial relations. As previous advocates of a scalar turn, we now question the privileging, in any form, of a single dimension of sociospatial processes, scalar or otherwise. We consider several recent sophisticated 'turns' within critical social science; explore their methodological limitations; and highlight several important strands of sociospatial theory that seek to transcend the latter. On this basis, we argue for a more systematic recognition of polymorphy-the organization of sociospatial relations in multiple forms-within sociospatial theory. Specifically, we suggest that territories (T), places (P), scales (S), and networks (N) must be viewed as mutually constitutive and relationally intertwined dimensions of sociospatial relations. We present this proposition as an extension of recent contributions to the spatialization of the strategic-relational approach (SRA), and we explore some of its methodological implications. We conclude by briefly illustrating the applicability of the 'TPSN framework' to several realms of inquiry into sociospatial processes under contemporary capitalism.
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摘要 :
Adsorption of trichloroethylene (TCE) in adsorbents containing hydrophilic and hydrophobic micropores was investigated in order to determine the mechanisms responsible for TCE adsorption on mineral solids. A high-pressure liquid c...
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Adsorption of trichloroethylene (TCE) in adsorbents containing hydrophilic and hydrophobic micropores was investigated in order to determine the mechanisms responsible for TCE adsorption on mineral solids. A high-pressure liquid chromatography method was used to measure TCE adsorption isotherms on three microporous adsorbents. Silica gel and zeolite type NaX were used as hydrophilic model adsorbents, and hexamethyldisilazane (HMDS)-treated silica gel was used as a model hydrophobic adsorbent. Batch uptake and desorption isotherms were also measured on the hydrophilic silica gel. Uptake of TCE by all three adsorbents was linear over the concentration range investigated. However, the silica gel desorption isotherm was highly nonlinear, as indicated by its Freundlich isotherm exponent of 0.58. Capillary phase separation into hydrophobic micropores was postulated as being responsible for the isotherm hysteresis. Supporting this hypothesis was the conformance of the TCE adsorption isotherm to Dubinin-Radushkevitch volume filling of micropores theory. The enthalpies for TCE adsorption on all three solids were determined by van't Hoff analysis of distribution coefficients measured over a temperature range from 5 to 90 deg C. The TCE adsorption enthalpies on the silica gel and HMDS silica gel were exothermic, but on the zeolite adsorption was endothermic. High exothermic adsoption enthalpies on the silica gel adsorbents indicated that TCE adsorption was occurring in hydrophobic micropores, and that adsorption on surfaces with large radii of curvature contributed only minimally to t
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