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  • 2010-2014  (647)
  • 2005-2009  (257)
  • 1985-1989  (25)
  • 1
    Electronic Resource
    Electronic Resource
    Size distribution for aggregates of associating polymers. II. Linear packing (1988)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 89 (1988), S. 5323-5328 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: We study the micellization of associating polymers (hydrocarbon chains with dipolar head groups in hydrophobic solvents) for the case where the polar heads form a linear array. The head interaction is assumed to be short ranged and the chain conformation (free) energy is assumed to follow spherical scaling in the small aggregation number limit and to have cylindrical scaling in the large aggregation number limit. In the small aggregation number limit, the aggregation number is only weakly dependent on the chain length. Numerical solutions as well as analytical studies show that the size distribution displays features of both the spherical and cylindrical aggregates: namely the absence of a sharp CMC transition and a rather sharp distribution function with a width that increases slowly with the mean aggregation number. In the large aggregation limit, the aggregation number can be a strong function of the chain molecular weight. We discuss the importance of the "end cap'' effect in determining the mean size as a function of the chain lengths.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.455623
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  • 2
    Electronic Resource
    Electronic Resource
    End-confined polymers: corrections to the Newtonian limit (1989)
    s.l. : American Chemical Society
    Macromolecules 22 (1989), S. 489-490 
    Details
    ISSN: 1520-5835
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ma00191a093
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  • 3
    Electronic Resource
    Electronic Resource
    A lattice model of a liquid supported monolayer of amphiphile molecules: Mean-field analysis (1988)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 88 (1988), S. 1290-1297 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: We describe a lattice model for amphiphile monolayers in which amphiphile configurational flexibility and amphiphile–amphiphile interaction in and out of the surface layer are explicitly treated. The analysis employs a mean-field approximation based on the work of Scheutjens and Fleer. The density distribution as a function of surface coverage and the equation of state of the monolayer are predicted. Monte Carlo simulations of the same model as treated in the mean-field approximation show that the predicted density profile is quite accurate except near φ=0 and that the film thickness as a function of surface coverage is well represented except near φ=0, but that the predicted liquid–gas phase boundary is rather inaccurate.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.454199
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  • 4
    Electronic Resource
    Electronic Resource
    Polymers with excluded volume in various geometries: Renormalization group methods (1987)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 86 (1987), S. 4266-4279 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Renormalization group (RG) methods are generalized to study a single polymer chain with excluded volume in various geometries with different boundary conditions (or polymer–surface interactions) on the limiting surfaces. Methods for the renormalization of these theories are presented and are used to derive the RG equations which dictate the generalized scaling behavior as a function of the several interaction and geometrical parameters. We illustrate the general theory by studying a polymer chain confined between two parallel plates with three different (Neumann, Dirichlet, and periodic) boundary conditions to one-loop order. We show that ε expansions are well behaved as long as the radius of gyration of the chain is smaller than the interplate separation L. The finite size corrections to the full space (bulk) limit are found to be proportional to L−1 for free boundaries, while they are exponentially small for periodic boundary conditions. The presence of several lengths and/or interactions produces interesting crossovers, which we illustrate for a Gaussian polymer chain attached to the exterior surface of a repulsive sphere where full crossover scaling functions are obtained for the partition function and moments of the end-vector distribution function. A new exponent associated with the radius of the sphere is predicted on the basis of scaling arguments which are supported by the RG equations. This work provides the necessary input ingredients for extension of the theory to treat semidilute concentrations.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.451887
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  • 5
    Electronic Resource
    Electronic Resource
    Interaction of a polymer chain with an asymmetric liquid–liquid interface (1986)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 85 (1986), S. 3068-3077 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: A continuum model is presented for polymer chains near an asymmetric (A–B) liquid–liquid interface where each side of the interface can have different polymer–surface interactions. For example, one side can attract the macromolecule, while the other can repel it. The model contains different monomer free energies and different excluded volume interactions for the macromolecule in the two solvents. The model is solved exactly in the ideal limit where excluded volume vanishes in order to illustrate qualitatively the wide range of possible behavior. We evaluate the fixed end-vector distribution, some moments of this distribution, and discuss other distributions and several interesting limiting cases. This rich model is constructed based on physical considerations and on consistency requirements which are imposed on any zeroth-order model when it is used in conjunction with renormalization group methods to incorporate the excluded volume interactions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.451014
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  • 6
    Electronic Resource
    Electronic Resource
    The NCBI dbGaP database of genotypes and phenotypes (2007)
    [s.l.] : Nature Publishing Group
    Nature genetics 39 (2007), S. 1181-1186 
    Details
    ISSN: 1546-1718
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Medicine
    Notes: [Auszug] The technical advances and declining costs of high-throughput genotyping afford investigators fresh opportunities to do increasingly complex analyses of genetic associations with phenotypic and disease characteristics. The leading candidates for such genome-wide association studies (GWAS) are ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/ng1007-1181
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  • 7
    Electronic Resource
    Electronic Resource
    Design and fabrication of CAP scaffolds by indirect solid free form fabrication (2005)
    Bingley : Emerald
    Rapid prototyping journal 11 (2005), S. 312-318 
    Details
    ISSN: 1355-2546
    Source: Emerald Fulltext Archive Database 1994-2005
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Purpose - To fabricate the self-hardening calcium phosphate composite scaffolds with controlled internal pore architectures using rapid prototyping (RP) techniques and investigate their in vitro bone tissue engineering responses. Design/methodology/approach - The three-dimensionally interconnected pores in scaffolds can facilitate sufficient supply of blood, oxygen and nutrients for the ingrowth of bone cells, tissue regeneration, and vascularization. It is essential for bone tissue engineering to provide an accurate control over the scaffolds material, porosity, and internal pore architectures. Negative image of scaffold was designed and epoxy resin molds were fabricated on sterolithography apparatus. Calcium phosphate cement slurry was cast in these molds. After self-hardening, the molds were removed by pyrolysis and the resulting scaffolds were obtained. Findings - Eight scaffolds with 54.45 percent porosity were tested on an Instron machine. The average compressive strength measured was 5.8±0.8?Mpa. Cytotoxicity and cell proliferation studies were conducted with rabbit osteoblast. Results showed that these scaffolds were non-toxic and displayed excellent cell growth during the 2 weeks of in vitro culture. Research limitations/implications - The resulting scaffolds inherited errors and defects from the molds, such as cracks and dimensional changes. Originality/value - The present method enhances the versatility of scaffold fabrication by RP. It is capable of reproducibly fabricating scaffolds from a variety of biomaterials.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1108/13552540510623639
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  • 8
    Electronic Resource
    Electronic Resource
    Study on Two-Phase Nanocrystalline Nd〈sub〉2〈/sub〉Fe〈sub〉14〈/sub〉B/α-Fe Bonded Magnet (2005)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 475-479 (Jan. 2005), p. 2165-2168 
    Details
    ISSN: 1662-9752
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Two-phase nanocrystalline ribbons were prepared by melt-spun and subsequent heat treatment. Excellent magnetic properties of the bonded magnet were achieved as follows: Br = 0.67 T, JHc = 664.3 kA·m-1, (BH) max = 75.0 kJ·m-3. The mean grain size of the ribbons heat-treated at 710 ℃/ 4 min is about 50 nm. After heat-treated the ribbons at 750 ℃/ 4 min, the mean grain size is about 100 nm
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/09/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.475-479.2165.pdf
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  • 9
    Electronic Resource
    Electronic Resource
    Study on Sputtering Characteristics of Ni80Cr20 Alloy Target (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 353-358 (Sept. 2007), p. 1891-1894 
    Details
    ISSN: 1013-9826
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Sputtering rate Sr was proposed as an alternative parameter instead of sputtering yield Yto calibrate the sputtering ability of the target, defined as the mass loss of the target per unit timeand sputtering current. The approach is more reliable for glow discharge processes since the intensebackscattering effect was taken into consideration. The effects of processing parameters on Sr wereinvestigated through orthogonal test, the results indicated that target temperature affects Srobviously, and among the discharge parameters, the target voltage and discharge pressure were thegoverning factors. Through regression analysis, the sputtering rate Sr was expressed as a function ofsputtering voltage and discharge pressure which could be used to evaluate or predict the real outputof the sputtering target
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/55/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.353-358.1891.pdf
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  • 10
    Electronic Resource
    Electronic Resource
    Experimental Study of Microelectrode Array and Micro-Hole Array Fabricated by Ultrasonic Enhanced Micro-EDM (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 364-366 (Dec. 2007), p. 482-487 
    Details
    ISSN: 1013-9826
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Micro electrical discharge machining (EDM), enhanced with ultrasonic vibration, isexplored and assessed as a method for developing microelectrode array, for microelectrode arrayfabricated by LIGA has shortcomings such as complex technology and high price. Based on themechanism of micro-EDM, micro-hole array discharges to fabricate microelectrode array by reversecopying. In the process of reverse copying, the thicker rod electrode can not rotate, resulting inelectric arc and short-circuit occurring easily, so it is necessary to add ultrasonic vibration on theplane plate electrode, in order to exclude debris as soon as possible and stabilize machining process.In the process of machining, four parameters, such as working voltage, working capacity, ultrasonicamplitude and holes spacing, are important to machining efficiency, each parameter has four typicalvalues. In order to reduce experiment times, a scheme of orthogonal experiment was designed withdifferent parameters combination. With result of experiments, the ratio of mean square deviation toerror mean square deviation of each parameter was calculated and significance of each parameterwas obtained, and the best parameters combination was asserted through theoretical calculation.Also, experimental study of using microelectrode array to machine micro-hole array by Micro-EDM was made and influence curve of each parameter was drawn. Finally, 5×5 arrays ofmicroelectrode were obtained, the diameter of single electrode is less than about 30.m and heightto-width aspect ratios is more than 8, moreover, these microelectrode arrays have good coaxialityand surface quality
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/56/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.364-366.482.pdf
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