Points and hyperplanes of the universal embedding space of the dual polar space DW(5,q), q odd

It was proved earlier that there are 6 isomorphism classes of hyperplanes in the dual polar space (5,q)$,$ even, which arise from its Grassmann-embedding. In the present paper, we extend these results to the case that $is odd. Specifically, we determine the orbits of the full automorphism group of (5,q)$, $odd, on the projective points (or equivalently, the hyperplanes) of the projective space (13,q)$ which affords the universal embedding of (5,q)$

The generating rank of the unitary and symplectic Grassmannians

We prove that the Grassmannian of totally isotropic $k$-spaces of the polar space associated to the unitary group $\mathsf{SU}_{2n}(\mathbb{F})$ ($n\in \mathbb{N}$) has generating rank ${2n\choose k}$ when $\mathbb{F}\ne \mathbb{F}_4$. We also reprove the main result of Blok [Blok2007], namely that the Grassmannian of totally isotropic $k$-spaces associated to the symplectic group $\mathsf{Sp}_{2n}(\mathbb{F})$ has generating rank ${2n\choose k}-{2n\choose k-2}$, when $\rm{Char}(\mathbb{F})\ne 2$

Relativistic Mean Field calculations of nuclear properties in early stages of stellar collapse

We use the Relativistic Mean Field (RMF) method to calculate properties of neutron rich, usually deformed nuclei, important for equation of state calculations and which have significant abundance in the early stages of stellar collapse. We compare the results of our microscopic calculations with existing cold nuclear equations of state based on macroscopic liquid drop model and the FRLDM model.Comment: 4 pages , Latex, 4 figures, uses espcrc1.sty. To appear in Nucl. Phys. A, proceedings of "Nuclei in the Cosmos 1996" 4th International Symposium on Nuclear Astrophysics. e-mail contact: [email protected]

Development of a Space Vehicle Electromagnetic Interference/compatibility Specification. Volume 3 - System Specification

This specification represents a new approach to controlling electromagnetic interference. In this approach the system integration contractor will be responsible for the development of discrete specification limits to be utilized on the program to which this specification is applied. The specification limits imposed upon subsystem contractors will be developed by the use of a computer program, available from the procuring agency, which is designed to consider the total system electromagnetic environment in the computation of these limits. The integration contractor will be required to mathematically model those circuits which represent required emitters and receptors of electromagnetic energy on the space vehicle. There are contained herein, a list of available computer models into which must be inserted particular parameters of the spacecraft subsystems. These functional models, when inserted into the computer program, will develop discrete specification limits based upon the requirements of the particular system modelled

On the Generation of Dual Polar Spaces of Symplectic Type over Finite Fields

AbstractIt is demonstrated that the dual polar space of typeSp2n(q),q>2, can be generated as a geometry by[formula]points

The generating rank of the unitary and symplectic Grassmannians

AbstractWe prove that the Grassmannian of totally isotropic k-spaces of the polar space associated to the unitary group SU2n(F) (n∈N) has generating rank (2nk) when F≠F4. We also reprove the main result of Blok (2007) [3], namely that the Grassmannian of totally isotropic k-spaces associated to the symplectic group Sp2n(F) has generating rank (2nk)−(2nk−2), when Char(F)≠2

Likeness in Henri Cartier-Bresson's Photo-portraits

After the invention of photography, modern theoreticians were hopeful that photography's faithfulness to nature would resolve painterly deficiencies by providing a more recognizable and convincing reproduction. Paradoxically, the advent of photography did not improve upon painting's failures, but exhibited an inherent problem. In particular, aspects of temporality hindered photography's ability to reproduce a convincing likeness. Concerning this issue, Gombrich opines that it could be "[…] true to say that we never see [in reality] what the instantaneous photograph reveals, for we gather up successions of movements, and never see static configurations as such."1 Because the constant motion of the eyes as well as the ephemeral nature of existence limits perception, I am studying the techniques used to convey aspects of "likeness" in the celebrity photo-portraits by Henri Cartier-Bresson. To establish what stylistic choices contribute to a recognizable portrait, I will analyze Bresson's photographical methods which he delineated in "The Decisive Moment." Bresson's concept of the decisive moment, far from falling within modernist accounts of photography's medium specificity, actually traces back to a much older discussion, one concerned with unearthing relations between photographs and paintings. As examples of this discussion, I look to ideas expressed by late nineteenth-century photographer-scientist Francis Galton and police officer Alphonse Bertillon. These theorists ascertained that photographs are not representative of a sum-total or synthetic image which humans perceive, but are indicative of an imperceptible instant. While Bresson's conception of photographic likeness relates to ideas espoused by Francis Galton, I also prove that Bresson's work is distinct from Galton's as it relates to human typicality. Whereas Galton's ideas concerning likeness relate to a need to arrive at ideal types, a comparison of Bresson's work with broader developments in the history of the concept of objectivity and image making reveals the ways in which Bresson's conception of typicality is distinct from that of Galton.1 Ernst Hans Gombrich, The Image and the Eye: Further studies in the psychology of pictorial representation. Ithaca, New York: Cornell University Press, 1982, p. 50

POLY(N-ISOPROPYL ACRYLAMIDE)-COATED SURFACES: INVESTIGATION OF CYTOTOXICITY WITH MAMMALIAN CELLS AND THE MECHANISM OF CELL DETACHMENT

With the increase in life expectancy and with growing numbers of an aging population, there is a rising need worldwide for replacement tissues and organs. One way to address this growing need is through engineered tissues, such as those generated from stimulus-responsive polymers. Stimulus-responsive polymers undergo a physical or chemical change when a stimulus is applied. One such material is poly(N-isopropyl acrylamide), (pNIPAM), which undergoes a conformation change in a physiologically relevant temperature range to release intact mammalian cell monolayers capable of being used to engineer tissues. Two factors currently limit the use of cell sheets for this purpose: 1) although the NIPAM monomer is toxic, it is unclear (and highly contested) whether its polymerized form is toxic as well; 2) there is little understanding of the mechanism of how cells detach from pNIPAM, and whether the (possibly) cytotoxic polymer would be transferred to implanted engineered tissues. In this work, we present an investigation of the cytotoxicity of pNIPAM-grafted surfaces, as well as an investigation of the mechanism of cell detachment from pNIPAM. The cytotoxicity of substrates prepared using several polymerization and deposition techniques are evaluated using appropriate cytotoxicity tests (MTS, Live/Dead, plating efficiency). Endothelial, epithelial, smooth muscle, and fibroblast cells were used for the cytotoxicity testing. The mechanism of cell detachment from pNIPAM was investigated using endothelial cells and surfaces synthesized via surface-initiated atom transfer radical polymerization. The detachment experiments were performed at various temperatures with and without an ATP inhibitor. In addition, fluorescent pNIPAM surfaces were generated to determine if any pNIPAM is removed with the detached cells. We find that cell sheets obtained by detachment from pNIPAM films will be suitable for use in engineered tissues, provided that the pNIPAM films that the cells were obtained from are themselves robust (i.e., grafted, covalently linked, or similar). We also find that the cell detachment from pNIPAM is mostly a passive process, and that no pNIPAM is removed from the surfaces during the detachment. Our results therefore provide an important step to clearing the hurdles presently obstructing the generation of engineering tissues from pNIPAM films

The \u27Uncanny\u27 and The Android

The character of the android is found widely in film and literature. While she appears across the entire spectrum of genres, she most often makes her appearance in the uncanny text. This appearance is nearly always accompanied by some variation of the vision motif. Despite wide spread interest in both the Uncanny\u27 and the android, to date, there is not a theory which accounts for the uncanny nature of the android and the prevalence of the vision motif in the android text. This paper will attempt to develop just such a theory. Any paper that addresses the \u27Uncanny\u27 must begin with Freud\u27s 1919 essay, The Uncanny. While this paper does not propose a psychoanalytic reading of the android, Freud\u27s work establishes the relationship between the android and the binary oppositions of strange/familiar, alive/dead and animate/inanimate. This discussion of binary oppositions leads to Ernst Jentsch\u27s 1909 publication, \u27On the Psychology of the Uncanny. Jentsch\u27s work is used to develop the uncanniness of the mechanical nature of life. Following Jentsch, Masahiro Mori\u27s 1970 publication, \u27The Uncanny Valley,\u27 places the human and the android on the same continuum, thus eliminating the opposition of man/machine. This, in turn, leads into a discussion of Donna Haraway\u27s The Cyborg Manifesto. Haraway\u27s model of the cyborg moves the discussion even further from dichotomous thought. The \u27Uncanny,\u27 it is concluded, is located at the midpoint of the binary pair. The android is uncanny because of her pivotal role in the dissolution of such pairs. Specifically, she compromises the mechanical/organic dichotomy. The android illustrates the mechanical nature of all life, thus making all life uncanny. The absolute foregrounding of vision in the android text requires a rethinking of the android. While android life is no different than human life in its mechanical qualities, the android nonetheless retains one fundamental difference: the android is designed. Thus androids, through an adaptation of Laura Mulvey\u27s \u27Visual Pleasure in Narrative Cinema,\u27 can be thought of as to-be-looked-at-ness machines. This enters the android into a reciprocal relationship with the camera, the looking-at-machine. It is this reciprocal machine-machine relationship which explains the ubiquitous pairing of the android with themes of vision