Search results
events & activities & places
events & activities & places
events & activities & places
events & activities & places
Show morecolor interior view of building with exposed brick walls, with scaffolding and wood holding up sections of floor / construction equipment in foreground / roof open to the sky
events & activities & places
Show less
Show more[No abstract available] Appropriate credit for the requested material should be given as follows: "Reprinted (adapted) with permission from Langmuir 7:9, 1988-1990. Copyright 1991 American Chemical Society."
Show less
Show moreThe electroclinic effect and dielectric response have been investigated in the British Drug House material SCE12 over its entire 15-K smectic-A range. Near the smectic-Asmectic-C*-phase transition both the electroclinic coefficient and dynamic response behave normally, the former diverging and the latter exhibiting a critical slowing down on approaching TA-C* from above. Similar behavior is seen in the dielectric response. Approximately 10 to 12 K above TA-C*, however, it was found that the electroclinic relaxation time levels off and even begins to increase again on approaching the nematicsmectic-A transition from below. The magnitude of the electroclinic coefficient, however, decreases monotonically on approaching the nematicsmectic-A transition. © 1991 The American Physical Society. Appropriate bibliographic citation and notice of the APS copyright must be included- "Li Z., Akins R.B., Dilisi G.A., Rosenblatt C., Petschek R.G., Physical Review A 43:2, 852-857 (1991). Copyright 1991 by the American Physical Society".
Show less
Show moreInstallation views of 1991 moCa exhibit "Carl Andre: Homage to Hollis Frampton" from the Museum of Contemporary Art Cleveland Archive collection (Spec-Coll-00080) -- Series 4: Audio visual, 1969-2010 -- Slides, 1987-1999 -- Carl Andre, Summer 1991 (Series 4. Box 80. Folder 38).
Show less
Show moreInstallation views of 1991 moCa exhibit "Carl Andre: Homage to Hollis Frampton" from the Museum of Contemporary Art Cleveland Archive collection (Spec-Coll-00080) -- Series 4: Audio visual, 1969-2010 -- Slides, 1987-1999 -- Carl Andre, Summer 1991 (Series 4. Box 80. Folder 38).
Show less
Show moreInstallation views of 1991 moCa exhibit "Carl Andre: Homage to Hollis Frampton" from the Museum of Contemporary Art Cleveland Archive collection (Spec-Coll-00080) -- Series 4: Audio visual, 1969-2010 -- Slides, 1987-1999 -- Carl Andre, Summer 1991 (Series 4. Box 80. Folder 38).
Show less
Show moreInstallation views of 1991 moCa exhibit "Carl Andre: Homage to Hollis Frampton" from the Museum of Contemporary Art Cleveland Archive collection (Spec-Coll-00080) -- Series 4: Audio visual, 1969-2010 -- Slides, 1987-1999 -- Carl Andre, Summer 1991 (Series 4. Box 80. Folder 38).
Show less
Show moreInstallation views of 1991 moCa exhibit "Carl Andre: Homage to Hollis Frampton" from the Museum of Contemporary Art Cleveland Archive collection (Spec-Coll-00080) -- Series 4: Audio visual, 1969-2010 -- Slides, 1987-1999 -- Carl Andre, Summer 1991 (Series 4. Box 80. Folder 38).
Show less
Show moreIt has been suggested that ferroelectric smectic phases may be formed by fraternal-twin liquid-crystal molecules, consisting of two very different mesogens bonded together by an appropriate spacer [R. G. Petschek and K. M. Wiefling, Phys. Rev. Lett. 59, 343 (1987)]. We discuss the range in which these ferroelectric phases appear in a Monte Carlo simulation of a simple computer model for such mesogens. The mesogens consist of two identical flexible segments that are bonded to two rigid segments with very different lengths which, in turn, are bonded together by a flexible segment. In the computer model these monomers can move freely in one direction, but are constrained to lie on a hexagonal lattice of rods in the other two directions, roughly the packing expected in a smectic-B crystal. The flexible segments are modeled by springs, and there is an energy cost for the overlap of flexible and rigid segments on neighboring lattice rods. The region in which polar (flexible, short rigid, flexible, long rigid, flexible) smectic layers form will be discussed. © 1991 The American Physical Society. Appropriate bibliographic citation and notice of the APS copyright must be included- "Perchak D.R., Petschek R.G., Physical Review A 43:12, 6756-6770 (1991). Copyright 1991 by the American Physical Society."
Show less
Show moreThe effective response time eff of the nematic-electroclinic effect was determined as a function of driving frequency and temperature. Near the nematicsmectic-A transition temperature TNSm-A, eff was found to be a function of driving frequency, indicating the existence of more than one physical process. Several degrees above TNSm-A, eff was found to be frequency independent up to 100 kHz. At these temperatures, moreover, the effective response times are quite small, of order 100 ns. © 1991 The American Physical Society. Appropriate bibliographic citation and notice of the APS copyright must be included- "Li Z., Ambigapathy R., Petschek R.G., Rosenblatt C., Physical Review A 43:12, 7109-7112 (1991). Copyright 1991 by the American Physical Society."
Show less
Show moreA semi-phenomenological calculation, accounting for van der Waals attractions and short range repulsions, is presented for an aqueous suspension of highly elongated lipid "tubules" and an acrylic surface. For a variety of conditions it is found that the Helmholtz potential has a hump a few kBT in height and located several micrometers from the wall. This barrier tends to prevent irreversible binding of tubules to the substrate, consistent with experimental observation. If the van der Waals attractions were sufficiently strong, however, the hump would vanish and the tubules would rapidly and irreversibly bind to the surface. © 1991.
Show less