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  • Articles  (639)
  • 2020-2023  (1)
  • 2000-2004  (191)
  • 1990-1994  (286)
  • 1975-1979  (161)
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  • 1
    facet.materialart.
    Unknown
    Some Recent Developments in Survey Design (1977)
    Chicago : Periodicals Archive Online (PAO)
    Journal of marketing research. 14:3 (1977:Aug.) 280 
    Details
    ISSN: 0022-2437
    Topics: Economics
    Description / Table of Contents: I. SAMPLING
    Notes: "Special Issue: Recent Developments in Survey Research"
    URL: http://gateway.proquest.com/openurl?url_ver=Z39.88-2004&res_dat=xri:pao:&rft_dat=xri:pao:article:b178-1977-014-03-000002
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  • 2
    facet.materialart.
    Unknown
    Characterization of impact pile driving signals during installation of offshore wind turbine foundations (2020)
    Details
    Publication Date: 2022-05-26
    Description: Author Posting. © Acoustical Society of America, 2020. This article is posted here by permission of Acoustical Society of America for personal use, not for redistribution. The definitive version was published in Journal of the Acoustical Society of America 147(4), (2020): 2323, doi:10.1121/10.0001035.
    Description: Impact pile driving creates intense, impulsive sound that radiates into the surrounding environment. Piles driven vertically into the seabed generate an azimuthally symmetric underwater sound field whereas piles driven on an angle will generate an azimuthally dependent sound field. Measurements were made during pile driving of raked piles to secure jacket foundation structures to the seabed in waters off the northeastern coast of the U.S. at ranges between 500 m and 15 km. These measurements were analyzed to investigate variations in rise time, decay time, pulse duration, kurtosis, and sound received levels as a function of range and azimuth. Variations in the radiated sound field along opposing azimuths resulted in differences in measured sound exposure levels of up to 10 dB and greater due to the pile rake as the sound propagated in range. The raked pile configuration was modeled using an equivalent axisymmetric FEM model to describe the azimuthally dependent measured sound fields. Comparable sound level differences in the model results confirmed that the azimuthal discrepancy observed in the measured data was due to the inclination of the pile being driven relative to the receiver.
    Description: This paper was presented at the fifth International Meeting on The Effects of Noise on Aquatic Life held in Den Haag, July 2019. Study concept, oversight, and funding for the experiment were provided by the U.S. Department of the Interior, Bureau of Ocean Energy Management (BOEM), Environmental Studies Program, Washington, DC, under Contract No. M15PC00002, Task Order M16PD00025. Collaborators in this project include Randy Gallien and Anwar Khan (HDR, Inc.).
    Description: 2020-10-17
    Repository Name: Woods Hole Open Access Server
    Type: Article
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    PAPER (OA)
  • 3
    Electronic Resource
    Electronic Resource
    Oxidative acetoxylation of methyl oleate with palladium catalysts (1975)
    s.l. : American Chemical Society
    The @journal of organic chemistry 40 (1975), S. 3247-3253 
    Details
    ISSN: 1520-6904
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/jo00910a019
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  • 4
    Electronic Resource
    Electronic Resource
    Sedimentation, diffusion, and Taylor dispersion of a flexible fluctuating macromolecule: The Debye–Bueche model revisited (1991)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 95 (1991), S. 8636-8646 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The role of hydrodynamic flexibility stemming from a lack of configurational rigidity in the sedimentary and dispersive transport of macromolecules in dilute polymer solutions is analyzed within the framework of generalized Taylor dispersion theory. A macromolecular chain is modeled as a thermally fluctuating porous Brownian spongelike sphere which—in contrast with the classical investigations of Debye–Bueche and Brinkman for the rigid porous sphere case—is allowed to undergo thermal fluctuations in size (assumed governed by a Hookean elastic potential). Our results show an increase of up to about 20% in the average translational mobility of the flexible (size-fluctuating) sphere above that of the comparable rigid Debye–Bueche/Brinkman sphere (of equilibrium preaveraged radius). Coupling between mobility variations (arising from instantaneous fluctuations in sphere radius) and diffusive sampling of such sphere radii in size space, respectively, gives rise to a "Taylor'' dispersion mechanism, which enhances the diffusivity of the macromolecule above and beyond its purely molecular value. Indeed, the dispersivity (dyadic) of the sedimenting sphere is shown to be anisotropic, possessing a value different from its (mean) molecular diffusivity in the direction of net sedimentation. Both sedimentation and dispersion effects associated with size fluctuations are shown to be maximized at finite, intermediate values of the nondimensional sponge stiffness parameter S, rather than being monotonically decreasing functions of S. The relative importance of both effects increase with decreasing permeability of the sphere. With an increasing number (N(very-much-greater-than)1) of monomer units composing the chain, the isotropic (molecular) portion of the dispersivity dyadic decreases like N−1/2, whereas the anisotropic Taylor-dispersion portion, which is exclusively associated with the size fluctuations, increases like N3. The latter contribution, which is negligible for ordinary gravitational settling (owing to the smallness of the relevant Langevin parameter), may, however, become significant for ultracentrifugation of polymer solutions composed of long (N〉105) macromolecular chains.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.461242
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  • 5
    Electronic Resource
    Electronic Resource
    Molecular relaxation properties studied by Rayleigh–Brillouin scattering from aqueous solutions of ammonium nitrate salts (1990)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 92 (1990), S. 3283-3291 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Rayleigh–Brillouin spectra of aqueous solutions of hydroxyl ammonium nitrate (HAN) and triethanol ammonium nitrate (TEAN) were studied at atmospheric pressure over a temperature range from 205 to 298 K. The hypersonic velocity and absorption coefficient of the phonons were calculated from the spectra as a function of temperature. The absorption due to viscosity and internal energy exchange through the relaxation mechanisms were considered. We find that both mechanisms are responsible for the absorption, but at the lower temperature, the one related to internal energy dominates. The free volume model was used to estimate the activation energy. This value is quite consistent with values calculated from the relaxation time. The effects of relaxation and the water concentration on mixtures of aqueous solutions of HAN and TEAN are also discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.457887
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  • 6
    Electronic Resource
    Electronic Resource
    Ultrahigh vacuum cold finger for surface reaction studies (1993)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 64 (1993), S. 2368-2370 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: The design of a cold finger and sample holder for use with a long-strong XYZ manipulator in a multitechnique ultrahigh vacuum chamber is presented. The cold finger design, based on the concept of a cryogenic transfer line, minimizes unwanted cryosorption on the surface of the cold finger. The simple, durable design allows samples to be cooled to below 90 K, rapidly heated to above 1000 K, and quickly returned to low temperatures. The rapid heating and cooling rates coupled with low outgassing make the design ideal for thermal desorption spectroscopy studies.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1143936
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  • 7
    Electronic Resource
    Electronic Resource
    “Fenestrin” and Conjugation in Tetrahymena thermophila (1994)
    Oxford, UK : Blackwell Publishing Ltd
    The @journal of eukaryotic microbiology 41 (1994), S. 0 
    Details
    ISSN: 1550-7408
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: Certain monoclonal antibodies interact with proteins of Tetrahymena thermophila found in the conjugation junction as well as around the gametic nuclei (pronuclei) of conjugating cells; they also react with the oral primordium and fission zone of vegetative cells and with the cytoproct and contractile vacuole pores of all cells. One of these (FXIX-3A7) was investigated in detail. Immunogold labelling suggests that the material labelled by the 3A7 monoclonal antibody, which we call “fenestrin,” is located beneath the epiplasm (membrane skeleton). Immunoblots reveal that the major and perhaps sole antigen is a 64 kDa polypeptide, found in two isoelectric variants. Developmental studies implicate fenestrin in two processes involved in conjugation. The first is “tip transformation.” During preliminary starvation (“initiation”), labelling of fenestrin first appeared as a spot at the anterior end of starved mature cells, then after mixing of different mating types (“costimulation”) it extended posteriorly along the anterior suture. After pairing, this region spread to form a widened plate. The second process is pronuclear transfer. Fenestrations representing channels between the conjugating cells began to appear 0.5 to 1 h after the conjugants united, and eventually merged to form a small number of temporary large holes during exchange of the transfer pronuclei. A fenestrin envelope also enclosed both the transfer and resident pronuclei; a strand of fenestrin connected the two. Shortly after pronuclear transfer, both transfer and resident pronuclei were released from fenestrin caps and fused to produce a zygotic nucleus (synkaryon) not associated with fenestrin. Fenestrin thus appears to be intimately involved in the process of pronuclear exchange.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1550-7408.1994.tb06047.x
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  • 8
    Electronic Resource
    Electronic Resource
    The Patterning of Ciliates (1991)
    Oxford, UK : Blackwell Publishing Ltd
    The @journal of eukaryotic microbiology 38 (1991), S. 0 
    Details
    ISSN: 1550-7408
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: This past-presidential address considers the relationship between small-scale assembly and large-scale patterning in ciliates. Certain model examples of assembly-based patterning are reviewed, followed by the introduction of Williams and Honts' concept of “meta-assembly” as applied to the development of the oral apparatus. The major part of this review then explores two topics: the nature and origin of large-scale circumferential order, and the manner by which the large-scale order of cell directions influences the organization of membranelles of the oral apparatus. In this review, I summarize an existing formal description of large-scale positional order, allude to a more precise abstract theoretical model, and end with a brief discussion of the problem of searching for molecular mechanisms.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1550-7408.1991.tb04827.x
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  • 9
    Electronic Resource
    Electronic Resource
    Morphology and Development of Mirror-Image Doublets of Stylonychia mytilus (1990)
    Oxford, UK : Blackwell Publishing Ltd
    The @journal of eukaryotic microbiology 37 (1990), S. 0 
    Details
    ISSN: 1550-7408
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: This paper describes the cortical anatomy and development of mirror-image doublets of Stylonychia mytilus, analyzed using the protargol technique. The reversed, or “left-handed” (LH) component of these doublets is a mirror image of the normal or “right handed” (RH) component with regard to the arrangement of cortical structures. The mirror-image patterning is imperfect, however, as the individual ciliary structures of the LH component all are of normal internal asymmetry, and the orientation of membranelles is inverted. Certain structures that would be expected to form near the line of symmetry are absent. During cell division and cortical reorganization, ciliary primordia arise and become arranged in a mirror-image pattern that is more perfect than that exhibited by the mature structures. Deviations from a mirror-image pattern appear at late stages when organelle sets differentiate within ciliary primordia: for example, the membranelle set differentiates within the oral primordium of the LH component in a sequence that is an inversion rather than a mirror image of the corresponding sequence of the RH component. This mixed control of oral development by different cortical “informational systems” accounts for some of the characteristic abnormalities of the mature oral structures of the LH component.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1550-7408.1990.tb01106.x
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  • 10
    Electronic Resource
    Electronic Resource
    Vance Tartar: A Unique Biologist (1993)
    Oxford, UK : Blackwell Publishing Ltd
    The @journal of eukaryotic microbiology 40 (1993), S. 0 
    Details
    ISSN: 1550-7408
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: . Vance Tartar (1911-1991) has made major discoveries concerning morphogenesis, patterning, and nucleocytoplasmic relations in the giant ciliate Stentor coeruleus, mostly by means of hand-grafting using glass microneedles. This article provides a chronological account of the major events of Vance Tartar's life, a brief description of some of his major scientific achievements, and a discussion of his distinctive personality and multifaceted interests. It concludes with a consideration of how his unique style of life and work contributed to his equally unique seientific contributions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1550-7408.1993.tb04873.x
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