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Irma Bowen Historic Clothing G. Collection - One of the best experts on this subject based on the ideXlab platform.

  • Bonnet, traditional German folk hat of Metal lace, 19th century, interior view
    University of New Hampshire Scholars\u27 Repository, 2019
    Co-Authors: Irma Bowen Historic Clothing G. Collection
    Abstract:

    19th century. Traditional bonnet known as a Goldhaube or “gold cap,” common to Osnabrück, Westphalia in Germany, assembled from bands of lace made of gold-toned Metal Strips and mounted on linen. One short and one long band of Metal lace 7.6 cm / 3 in. wide are sewn together edge to edge with the shorter band centered on the long band and laid smoothly back to form the crown. The longer band is crimped into ruffles that flare gently outward to form the brim and extends to wrap around the bottom edge of the crown to meet at the center back. The brim is further framed with linen lace, supported with linen-wrapped wire shaped into loops. The back of the crown is laid with thin Strips of flat foil and embellished with padded embroidery using Metallic thread over paper, sequins, and either garnets or glass. Broad purple and green silk brocade ribbons woven with silver form many-lobed bows at the nape. Hand-sewn.https://scholars.unh.edu/bowen_collection/1047/thumbnail.jp

  • Bonnet, traditional German folk hat of Metal lace, 19th century, back view
    University of New Hampshire Scholars\u27 Repository, 2019
    Co-Authors: Irma Bowen Historic Clothing G. Collection
    Abstract:

    19th century. Traditional bonnet known as a Goldhaube or “gold cap,” common to Osnabrück, Westphalia in Germany, assembled from bands of lace made of gold-toned Metal Strips and mounted on linen. One short and one long band of Metal lace 7.6 cm / 3 in. wide are sewn together edge to edge with the shorter band centered on the long band and laid smoothly back to form the crown. The longer band is crimped into ruffles that flare gently outward to form the brim and extends to wrap around the bottom edge of the crown to meet at the center back. The brim is further framed with linen lace, supported with linen-wrapped wire shaped into loops. The back of the crown is laid with thin Strips of flat foil and embellished with padded embroidery using Metallic thread over paper, sequins, and either garnets or glass. Broad purple and green silk brocade ribbons woven with silver form many-lobed bows at the nape. Hand-sewn.https://scholars.unh.edu/bowen_collection/1046/thumbnail.jp

  • Bonnet, traditional German folk hat of Metal lace, 19th century, side view
    University of New Hampshire Scholars\u27 Repository, 2019
    Co-Authors: Irma Bowen Historic Clothing G. Collection
    Abstract:

    19th century. Traditional bonnet known as a Goldhaube or “gold cap,” common to Osnabrück, Westphalia in Germany, assembled from bands of lace made of gold-toned Metal Strips and mounted on linen. One short and one long band of Metal lace 7.6 cm / 3 in. wide are sewn together edge to edge with the shorter band centered on the long band and laid smoothly back to form the crown. The longer band is crimped into ruffles that flare gently outward to form the brim and extends to wrap around the bottom edge of the crown to meet at the center back. The brim is further framed with linen lace, supported with linen-wrapped wire shaped into loops. The back of the crown is laid with thin Strips of flat foil and embellished with padded embroidery using Metallic thread over paper, sequins, and either garnets or glass. Broad purple and green silk brocade ribbons woven with silver form many-lobed bows at the nape. Hand-sewn.https://scholars.unh.edu/bowen_collection/1044/thumbnail.jp

  • Bonnet, traditional German folk hat of Metal lace, 19th century, interior linen lace detail
    University of New Hampshire Scholars\u27 Repository, 2019
    Co-Authors: Irma Bowen Historic Clothing G. Collection
    Abstract:

    19th century. Traditional bonnet known as a Goldhaube or “gold cap,” common to Osnabrück, Westphalia in Germany, assembled from bands of lace made of gold-toned Metal Strips and mounted on linen. One short and one long band of Metal lace 7.6 cm / 3 in. wide are sewn together edge to edge with the shorter band centered on the long band and laid smoothly back to form the crown. The longer band is crimped into ruffles that flare gently outward to form the brim and extends to wrap around the bottom edge of the crown to meet at the center back. The brim is further framed with linen lace, supported with linen-wrapped wire shaped into loops. The back of the crown is laid with thin Strips of flat foil and embellished with padded embroidery using Metallic thread over paper, sequins, and either garnets or glass. Broad purple and green silk brocade ribbons woven with silver form many-lobed bows at the nape. Hand-sewn.https://scholars.unh.edu/bowen_collection/1049/thumbnail.jp

  • Bonnet, traditional German folk hat of Metal lace, 19th century, side back view
    University of New Hampshire Scholars\u27 Repository, 2019
    Co-Authors: Irma Bowen Historic Clothing G. Collection
    Abstract:

    19th century. Traditional bonnet known as a Goldhaube or “gold cap,” common to Osnabrück, Westphalia in Germany, assembled from bands of lace made of gold-toned Metal Strips and mounted on linen. One short and one long band of Metal lace 7.6 cm / 3 in. wide are sewn together edge to edge with the shorter band centered on the long band and laid smoothly back to form the crown. The longer band is crimped into ruffles that flare gently outward to form the brim and extends to wrap around the bottom edge of the crown to meet at the center back. The brim is further framed with linen lace, supported with linen-wrapped wire shaped into loops. The back of the crown is laid with thin Strips of flat foil and embellished with padded embroidery using Metallic thread over paper, sequins, and either garnets or glass. Broad purple and green silk brocade ribbons woven with silver form many-lobed bows at the nape. Hand-sewn.https://scholars.unh.edu/bowen_collection/1045/thumbnail.jp

Zhenglian Jiang - One of the best experts on this subject based on the ideXlab platform.

  • a new method for predicting the three dimensional surface texture transfer in the skin pass rolling of Metal Strips
    Wear, 2019
    Co-Authors: Liangchi Zhang, Zhenglian Jiang
    Abstract:

    Abstract Revealing the mechanisms of texture transfer in the skin pass of Metal rolling is challenging due to the complex contact of randomly distributed surface asperities in both the roll and strip surfaces. This paper presents a novel three-dimensional characterisation method to overcome such difficulties. In this method, the plastic deformation of the random asperities was treated by the material redistribution at asperity tips. A time increment scheme was used to draw the rough surfaces of work roll and strip into the rolling bite. Within each time increment, an iterative technique was developed to predict the surface topography of the strip with the integration of the randomly-rough surface of the work roll. A systematic comparison with the finite element analysis (FEA) confirmed that the method developed can reliably predict the surface texture transfer. In addition, it was found that the surface topography of a Metal strip can be significantly affected by the texture transfer from the work roll, that a larger reduction ratio results in a higher texture transfer ratio, and that the work roll surface topography is critical to the formation of desired strip surfaces.

  • a multi field analysis of hydrodynamic lubrication in high speed rolling of Metal Strips
    International Journal of Mechanical Sciences, 2018
    Co-Authors: Liangchi Zhang, Zhenglian Jiang
    Abstract:

    Abstract This paper presents a multi-field analysis of full hydrodynamic lubrication in high speed cold rolling of Metal Strips. A robust method was developed to solve the fluid field (the lubricant flow at the roll-strip interface) and solid field (the elastoplastic deformation of a Metal strip) in a simple step. The elastoplastic deformation of the strip was solved by a dynamic explicit finite element method while the hydrodynamic pressure was calculated by the Reynolds equation. A cavitation boundary was introduced to determine the hydrodynamic pressure when the lubricant film breaks down. In addition, the coupled interaction between the lubricant flow and the elastoplastic deformation of the strip, which was caused by the hydrodynamic pressure and lubricant shear stress at the solid-liquid interface, were successfully treated by an additional penalty term. Both the pressure-driven term and lubricant shearing term were used to calculate the lubricant shear stress. The introduced penalty method enables a stable numerical calculation of Reynolds equation at a high hydrodynamic pressure. The method has overcome the traditional difficulties in solving the interface contact pressure within separated zones and has led to new understanding of the effects of rolling speed and pressure coefficient of the lubricant on the hydrodynamic pressure and lubricant film thickness.

  • a simple approach for analysing the surface texture transfer in cold rolling of Metal Strips
    The International Journal of Advanced Manufacturing Technology, 2018
    Co-Authors: Liangchi Zhang, Zhenglian Jiang
    Abstract:

    This paper presents a simple approach for analysing the surface texture transfer in cold rolling of Metal Strips. The approach made use of the advantages of the slab method and accommodated the surface roughness effect of a rigid work roll. A numerically generated rough surface, whose heights generally follow a Gaussian distribution and distribute transversely, was used in the calculation. The transient distribution of contact stresses and instant texture transfer were then predicted. The interface contact pressure and friction stresses predicted by the established method were verified by the finite element method under the same rolling conditions. It was found that the new approach is efficient and cost-effective. The application of the approach revealed that due to the surface texture of the work roll, the interface stress in the rolling bite can be discontinuous, and that a higher roughness transfer ratio can be expected when reduction ratio increases.

Liangchi Zhang - One of the best experts on this subject based on the ideXlab platform.

  • a new method for predicting the three dimensional surface texture transfer in the skin pass rolling of Metal Strips
    Wear, 2019
    Co-Authors: Liangchi Zhang, Zhenglian Jiang
    Abstract:

    Abstract Revealing the mechanisms of texture transfer in the skin pass of Metal rolling is challenging due to the complex contact of randomly distributed surface asperities in both the roll and strip surfaces. This paper presents a novel three-dimensional characterisation method to overcome such difficulties. In this method, the plastic deformation of the random asperities was treated by the material redistribution at asperity tips. A time increment scheme was used to draw the rough surfaces of work roll and strip into the rolling bite. Within each time increment, an iterative technique was developed to predict the surface topography of the strip with the integration of the randomly-rough surface of the work roll. A systematic comparison with the finite element analysis (FEA) confirmed that the method developed can reliably predict the surface texture transfer. In addition, it was found that the surface topography of a Metal strip can be significantly affected by the texture transfer from the work roll, that a larger reduction ratio results in a higher texture transfer ratio, and that the work roll surface topography is critical to the formation of desired strip surfaces.

  • a multi field analysis of hydrodynamic lubrication in high speed rolling of Metal Strips
    International Journal of Mechanical Sciences, 2018
    Co-Authors: Liangchi Zhang, Zhenglian Jiang
    Abstract:

    Abstract This paper presents a multi-field analysis of full hydrodynamic lubrication in high speed cold rolling of Metal Strips. A robust method was developed to solve the fluid field (the lubricant flow at the roll-strip interface) and solid field (the elastoplastic deformation of a Metal strip) in a simple step. The elastoplastic deformation of the strip was solved by a dynamic explicit finite element method while the hydrodynamic pressure was calculated by the Reynolds equation. A cavitation boundary was introduced to determine the hydrodynamic pressure when the lubricant film breaks down. In addition, the coupled interaction between the lubricant flow and the elastoplastic deformation of the strip, which was caused by the hydrodynamic pressure and lubricant shear stress at the solid-liquid interface, were successfully treated by an additional penalty term. Both the pressure-driven term and lubricant shearing term were used to calculate the lubricant shear stress. The introduced penalty method enables a stable numerical calculation of Reynolds equation at a high hydrodynamic pressure. The method has overcome the traditional difficulties in solving the interface contact pressure within separated zones and has led to new understanding of the effects of rolling speed and pressure coefficient of the lubricant on the hydrodynamic pressure and lubricant film thickness.

  • a simple approach for analysing the surface texture transfer in cold rolling of Metal Strips
    The International Journal of Advanced Manufacturing Technology, 2018
    Co-Authors: Liangchi Zhang, Zhenglian Jiang
    Abstract:

    This paper presents a simple approach for analysing the surface texture transfer in cold rolling of Metal Strips. The approach made use of the advantages of the slab method and accommodated the surface roughness effect of a rigid work roll. A numerically generated rough surface, whose heights generally follow a Gaussian distribution and distribute transversely, was used in the calculation. The transient distribution of contact stresses and instant texture transfer were then predicted. The interface contact pressure and friction stresses predicted by the established method were verified by the finite element method under the same rolling conditions. It was found that the new approach is efficient and cost-effective. The application of the approach revealed that due to the surface texture of the work roll, the interface stress in the rolling bite can be discontinuous, and that a higher roughness transfer ratio can be expected when reduction ratio increases.

Antoine Moreau - One of the best experts on this subject based on the ideXlab platform.

  • impact of nonlocal response on Metallodielectric multilayers and optical patch antennas
    Physical Review B, 2013
    Co-Authors: Antoine Moreau, Cristian Ciraci, David R Smith
    Abstract:

    We analyze the impact of nonlocality on the waveguide modes of Metallodielectric multilayers and optical patch antennas, the latter formed from Metal Strips closely spaced above a Metallic plane. We model both the nonlocal effects associated with the conduction electrons of the Metal and the previously overlooked response of bound electrons. We show that the fundamental mode of a Metal-dielectric-Metal waveguide, sometimes called the gap plasmon, is very sensitive to nonlocality when the insulating, dielectric layers are thinner than 5 nm. We suggest that optical patch antennas, which can easily be fabricated with controlled dielectric spacer layers and can be interrogated using far-field scattering, can enable the measurement of nonlocality in Metals with good accuracy.

Bao Jia Yang - One of the best experts on this subject based on the ideXlab platform.

  • planar spoof plasmonic ultra wideband filter based on low loss and compact terahertz waveguide corrugated with dumbbell grooves
    Applied Optics, 2015
    Co-Authors: Yong Jin Zhou, Bao Jia Yang
    Abstract:

    Although subwavelength planar terahertz (THz) plasmonic devices can be implemented based on planar spoof surface plasmons (SPs), they still suffer from a little high propagation loss. Here the dispersion and propagation characteristics of the spoof plasmonic waveguide composed of double Metal Strips corrugated with dumbbell shaped grooves have been investigated. It has been found that much lower propagation loss and longer propagation length can be achieved based on the waveguide compared with the conventional spoof plasmonic waveguide with rectangular grooves. Moreover, the waveguide can implement a decrease in size of about 22%. An ultra-wideband THz plasmonic filter for planar circuits has been demonstrated based on the proposed waveguide. The experimental verification at the microwave frequency has been conducted by scaling up the geometry size of the filter.

  • a 4 way wavelength demultiplexer based on the plasmonic broadband slow wave system
    Optics Express, 2014
    Co-Authors: Yong Jin Zhou, Bao Jia Yang
    Abstract:

    We propose a broadband slow wave system based on the thin Metal-insulator-Metal (MIM) graded grating structure composed of two corrugated Metal Strips with periodic array of grooves on a thin dielectric substrate. The guided spoof surface plasmon polaritons (SSPPs) at different frequencies can be localized at different positions along the ultrathin MIM grating. By introducing specially designed non-corrugated MIM branches with specific lengths at the locations where the EM waves are trapped, the trapped EM waves can be released and propagate along these branches. A 4-way wavelength demultiplexer based on such plasmonic broadband slow wave system is then demonstrated and fabricated. To improve the isolations between different branches at lower frequencies, band-reject filters are inserted at the front of some MIM branches. The measurements and the simulation results have shown very good agreements, which validate the feasibility of the 4-way wavelength demultiplexer.