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  • 1
    Electronic Resource
    Electronic Resource
    Regulation of C-myc protooncogene expression in osteoblastic cells by arachidonic acid metabolites: Relationship to proliferation (1992)
    Springer
    Calcified tissue international 50 (1992), S. 372-377 
    Details
    ISSN: 1432-0827
    Keywords: Prostaglandin E2 ; Leukotriene B4 ; Osteoblast ; Proliferation ; c-myc protooncogene
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine , Physics
    Notes: Summary Prostaglandin E2 and leukotriene B4 are metabolites of arachidonic acid with well-characterized effects on osteoblastic cells. Prostaglandin E2 has been shown to be a potent bone-resorbing agent and to stimulate as well as inhibit osteoblastic cell proliferation. Leukotriene B4 has also been demonstrated to stimulate or inhibit osteoblastic cell proliferation, depending on the cell type tested. In the present study, the potential relationship of the effects of prostaglandin E2 and leukotriene B4 on osteoblastic cell proliferation to c-myc protooncogene expression was investigated. Prostaglandin E2 has been shown previously to inhibit normal rat osteoblastic cell proliferation. The present studies show that prostaglandin E2 at 10-6 M decreased c-myc expression in these cells. In the human osteoblastic osteosarcoma cell line, G292, prostaglandin E2 increased c-myc expression and inhibited proliferation. In contrast, epidermal growth factor increased DNA synthesis as well as c-myc expression. Prostaglandin E2 also inhibited proliferation of another human osteoblastic osteosarcoma cell line, Saos-2, but it did not produce any changes in c-myc expression. In these cells, epidermal growth factor did not affect either DNA synthesis or c-myc expression. Leukotriene B4 did not show any effects on c-myc expression in any of the osteoblastic cells tested.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00301636
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  • 2
    Electronic Resource
    Electronic Resource
    Thermoelectric Properties of Bismuth Telluride Based Materials Prepared by Powder Metallurgy Processing (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 336-338 (Apr. 2007), p. 864-867 
    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: Polycrystalline samples of Bi2Te3 based alloys were prepared by powder metallurgy processingincluding a melting-grinding and a sintering procedure of compacted pellets. Two sintering procedures ashot-pressing and spark plasma sintering (SPS) were employed. The thermoelectric properties andmechanical strength were measured in all case. Thermoelectric properties for p-type (Bi0.25Sb0.75)2Te3 andn-type Bi2(Te0.2Se0.8)3 changed with sintering temperature in both sintering methods. Mechanical strengthand relative density increase with sintering temperature in two sintering procedures. The results firmlysuggest that both sintering procedures are promising to obtain high performance thermoelectric materials
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/53/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.336-338.864.pdf
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  • 3
    Electronic Resource
    Electronic Resource
    The Effect of Hot Extrusion on the Structure and Thermoelectric Properties of Bi〈sub〉2〈/sub〉Te〈sub〉3〈/sub〉 Material (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 534-536 (Jan. 2007), p. 1549-1552 
    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: Bismuth telluride material was fabricated using hot extrusion. The crystal structure wasidentified by X-ray diffraction and Scanning electron microscopy. The oriented texture in extrusiondirection was formed. All the samples showed high mechanical strength. The thermoelectricproperties were determined by measuring electrical resistivity, Seebeck coefficient and thermalconductivity. The influence of extrusion temperature on the thermoelectric performence was studied.The variation of figure with temperature was also studied. The oriented texture seems promising toimprove thermoelectric properties and mechanical strength
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/14/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.534-536.1549.pdf
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  • 4
    Electronic Resource
    Electronic Resource
    Geometrical optics analysis of electromagnetic-missile backscattering (1992)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 72 (1992), S. 1669-1670 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: In this paper, the backscattering of an electromagnetic (EM) missile the energy of which decays as r−ε by arbitrary three-dimensional (3D) and two-dimensional (2D) targets, such as perfect conductors, dielectrics, and a perfect conductor coated with dielectric, is analyzed by using geometrical optics. The analysis shows that the backscattered energy of the EM missile by arbitrary 3D and 2D targets is proportional to r−εR1R2/[(R1+2r)(R2+2r)] and r−εR/(R+2r), respectively, where R1 and R2 are the two principal radii of curvature of the 3D surface at the specular point and R is the radius of curvature of the 2D surface at the specular point. This general result includes several special examples available, such as plates, perfectly conducting elliptical cylinders, and spheres. It is seen that the rate of energy decrease of the backscattered EM missile is slower than those for conventional 3D and 2D backscattered fields.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.351688
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  • 5
    Electronic Resource
    Electronic Resource
    Dyadic Green's functions and dipole radiations in layered chiral media (1994)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 75 (1994), S. 30-35 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Dyadic Green's functions in the unbounded chiral medium are expanded by the vector wave functions in unbounded chiral media for Cartesian, cylindrical, and spherical coordinate systems. These expressions are useful to treat the radiation and scattering in planarly, cylindrically, and spherically layered media. Instead of the eigenfunction expansions of the dyadic Green's functions, the dyadic Green's functions in isotropic media are used, remarkably simplifying the derivation of dyadic Green's functions in chiral media. As the first illustrative application, Sommerfeld integral representations of the dyadic Green's functions and dipole radiations in a planarly layered chiral medium are presented via a novel derivation. As the second application example, by the method of images the closed expression of dyadic Green's functions are obtained for an isotropic chiral half-space bounded by a perfectly conducting plane. The established asymptotic and numerical methods for Sommerfeld integrals in isotropic media are therefore applicable to the corresponding problems in multilayer chiral media.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.355850
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  • 6
    Electronic Resource
    Electronic Resource
    Exact solutions of coupled-wave equations in piezoelectric solids (1993)
    College Park, Md. : American Institute of Physics (AIP)
    Journal of Mathematical Physics 34 (1993), S. 5376-5390 
    Details
    ISSN: 1089-7658
    Source: AIP Digital Archive
    Topics: Mathematics , Physics
    Notes: The homogeneous coupled-wave equations under the quasistatic approximation are exactly solved by using the method of angular-spectrum expansions. And Weyl's method of deriving the scalar Green's functions in an isotropic media is generalized to the study of the tensor Green's functions (solutions to inhomogeneous coupled-wave equations) in piezoelectric media. The series, integral representations, and addition theorems of the spherical wave functions of the first, second, third, and fourth kind for homogeneous piezoelectric solids are presented. The series representations of Green's functions are of the form of separation variables. These representations are well suited to imposing the boundary conditions when dealing with fields and waves in spherically layered piezoelectric media.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.530310
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  • 7
    Electronic Resource
    Electronic Resource
    Bismuth zinc niobate pyrochlore dielectric thin films for capacitive applications (2001)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 89 (2001), S. 767-774 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Bi2O3–ZnO–Nb2O5 pyrochlore thin films were prepared on platinum coated Si wafers using a metalorganic deposition process. The structures, morphologies, and dielectric properties of films with two compositions: (Bi1.5Zn0.5)(Zn0.5Nb1.5)O7 and Bi2(Zn1/3Nb2/3)2O7, were investigated. Thin films of (Bi1.5Zn0.5)(Zn0.5Nb1.5)O7 have a cubic pyrochlore phase when crystallized at 550 °C or higher. The crystal structure of Bi2(Zn1/3Nb2/3)2O7 thin films was dependent on the firing temperature; the films showed the cubic pyrochlore phase at temperatures below 650 °C, and a pseudo-orthorhombic pyrochlore structure at 750 °C. A mixture of cubic and pseudo-orthorhombic structures was found in thin films crystallized at 700 °C. (Bi1.5Zn0.5)(Zn0.5Nb1.5)O7 films fired at 750 °C had a dielectric constant of ∼150 and a negative temperature coefficient of capacitance of −400 ppm/°C. Bi2(Zn1/3Nb2/3)2O7 thin films fired at 750 °C had a smaller dielectric constant of ∼80 and a positive temperature coefficient of capacitance of 150 ppm/°C. The dielectric constants of the thin films are composition, structure, and firing temperature dependent. The loss tangents of both types of films were smaller than 0.008. Bias voltage dependence of dielectric constant showed that the cubic (Bi1.5Zn0.5)(Zn0.5Nb1.5)O7 films fired at 750 °C were tunable, while the pseudoorthorhombic Bi2(Zn1/3Nb2/3)2O7 films were nearly field independent. The relatively large dielectric constants, small loss tangents, controllable temperature coefficients of capacitance, and tunability of the dielectric constant suggests that Bi2O3–ZnO–Nb2O5 thin films have potential applications for integrated microwave components and decoupling capacitors. © 2001 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1328408
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  • 8
    Electronic Resource
    Electronic Resource
    Nonlinear optical properties of lanthanum doped lead titanate thin film using Z-scan technique (1996)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 69 (1996), S. 458-459 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Lanthanum doped lead titanate (PLT) thin films with good surface morphology and perovskite structure were fabricated by the metalo-organic decomposition process. Their nonlinear optical property was investigated by Z-scan technique. PLT30 thin films on the quartz substrate display strong nonlinear optical effects. A nonlinear refractive index as high as 3.0×10−7 esu was obtained for the thin film. All the results show that PLT ferroelectric thin films are promising materials for nonlinear optics. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.118138
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  • 9
    Electronic Resource
    Electronic Resource
    Investigation of Chip Formation Mechanism and Surface Integrity in High Speed Milling Titanium Alloy (2003)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 233-236 (Jan. 2003), p. 489-496 
    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
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/46/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.233-236.489.pdf
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  • 10
    Electronic Resource
    Electronic Resource
    Tensile Creep Behavior of NiAl-9Mo Eutectic Alloy (2005)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 475-479 (Jan. 2005), p. 763-766 
    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: The tensile creep behavior of NiAl-9Mo eutectic alloy has been investigated over a stress range of 50 to 100MPa at the temperatures ranging from 850 to 950°C. All of the creep curves exhibit the very long steady-state stage. The creep parameters and TEM observations indicates the kinetics of the steady-state creep deformation is governed by dislocation climb in the NiAl matrix phase. The crack origination and development at the colony boundary results in the onset of tertiary creep stage and final fracture of the alloy
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/09/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.475-479.763.pdf
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