7 results
Search Results
2. The application of poly(methyl methacrylate- co-butyl acrylate- co-styrene) in reinforcing fragile papers: experiments and computer simulations.
- Author
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Qiao, Laicong, Chen, Keran, Zhao, Daohui, Zhan, Yuzhong, Min, Wenfeng, Huang, Qiang, Shen, Guopeng, and Zhou, Jian
- Subjects
POLYMETHYLMETHACRYLATE ,PAPER ,DEPOLYMERIZATION ,POLYMERS ,COMPUTER simulation - Abstract
In museums, libraries and archives, some of the paper relics, upon ageing, are very brittle and even cannot be handled without destroying the material. This is because of the depolymerization of cellulose and, consequently, the loss of mechanical strength. To prolong the life expectancy of paper relics, the poly(methyl methacrylate- co-butyl acrylate- co-styrene) (MMA-BA-ST) was used to strengthen the fragile paper fibers in this work. The relation between the mass concentration of MMA-BA-ST emulsion and the specific properties of papers (e.g., folding endurance, tensile strength, tearing strength, whiteness and glossiness) and the ageing resistance were investigated. In addition, the effect of MMA-BA-ST on different types of paper was also studied. Furthermore, the reinforcing mechanism of MMA-BA-ST on paper was also investigated by dissipative particle dynamics simulations. The results showed that MMA-BA-ST could significantly improve the mechanical properties and ageing resistance of papers. [ABSTRACT FROM AUTHOR]
- Published
- 2017
- Full Text
- View/download PDF
3. Modeling the social consequences of testimonial norms.
- Author
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Zollman, Kevin
- Subjects
PAPER ,PHILOSOPHICAL analysis ,TESTIMONY (Theory of knowledge) ,SOCIAL epistemology ,COMPUTER simulation ,RELIABILITY (Personality trait) ,TESTING - Abstract
This paper approaches the problem of testimony from a new direction. Rather than focusing on the epistemic grounds for testimony, it considers the problem from the perspective of an individual who must choose whom to trust from a population of many would-be testifiers. A computer simulation is presented which illustrates that in many plausible situations, those who trust without attempting to judge the reliability of testifiers outperform those who attempt to seek out the more reliable members of the community. In so doing, it presents a novel defense for the credulist position that argues one should trust testimony without considering the underlying reliability of the testifier. [ABSTRACT FROM AUTHOR]
- Published
- 2015
- Full Text
- View/download PDF
4. Folding and crumpling adaptive sheets.
- Author
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Narain, Rahul, Pfaff, Tobias, and O'Brien, James F.
- Subjects
PAPER ,MATERIAL plasticity ,DEFORMATIONS (Mechanics) ,COMPUTER simulation ,DATA modeling - Abstract
We present a technique for simulating plastic deformation in sheets of thin materials, such as crumpled paper, dented metal, and wrinkled cloth. Our simulation uses a framework of adaptive mesh refinement to dynamically align mesh edges with folds and creases. This framework allows efficient modeling of sharp features and avoids bend locking that would be otherwise caused by stiff in-plane behavior. By using an explicit plastic embedding space we prevent remeshing from causing shape diffusion. We include several examples demonstrating that the resulting method realistically simulates the behavior of thin sheets as they fold and crumple. [ABSTRACT FROM AUTHOR]
- Published
- 2013
- Full Text
- View/download PDF
5. Numerical simulation of liquid absorption in paper-like swelling porous media.
- Author
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Masoodi, Reza, Tan, Hua, and Pillai, Krishna M.
- Subjects
COMPUTER simulation ,ADSORPTION (Chemistry) ,SWELLING of materials ,POROUS materials ,CELLULOSE ,FINITE element method ,PERMEABILITY ,DARCY'S law - Abstract
The work is built on a previous research by Wiryana and Berg, in which wicking into four wet-formed paper stripes, consisting of cellulose fibers and four different percentages of the powdered carboxymethyl cellulose (CMC) superabsorbent, was studied experimentally. Because of the swelling of cellulose fibers and CMC powder on contact with water, the wicking was accompanied by a swelling of the matrix. A finite element/control volume (FE/CV)-based computer program is used for the first time to model the wicking in such swelling porous medium. The simulation used a novel form of continuity equation, which included the effects of liquid absorption and matrix swelling, in conjunction with the Darcy's law to model the single-phase flow behind a clearly defined liquid-front. A new method of estimating the time-varying permeability of the paper, based on the absorbed liquid-mass vs. time plots, is also proposed. Later, this time-dependent permeability is used in the numerical simulation to change the permeability in elements behind the moving liquid-front as a function of the time that the element has been wetted by the liquid, since the passage of the liquid-front. The numerical prediction of the wicking-front location as a function of time compares well with the reported experimental data. © 2011 American Institute of Chemical Engineers AIChE J, 58: 2536-2544, 2012 [ABSTRACT FROM AUTHOR]
- Published
- 2012
- Full Text
- View/download PDF
6. A Hands-Free Unit with Noise Reduction by Using Adaptive Beamformer.
- Author
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Kobayashi, Kazunori, Haneda, Yoichi, Furuya, Ken'ichi, and Kataoka, Akitoshi
- Subjects
NOISE ,PAPER ,NUMERICAL analysis ,COMPUTER simulation ,SIMULATION methods & models ,ELECTROMECHANICAL analogies ,COMPUTERS ,MATHEMATICAL models ,SOUND - Abstract
This paper presents an implementation of an ~daptive beamformer in a hands-free unit. The proposec~ ~daptive beamformer suppresses stationary noise an~ nterference sound. The adaptive beamformer and acoustic `cho canceller were implemented in a compact hands-free mit with a low-cost DSP. Experimental results demonstrate he noise reduction performance of the hands-free unit'. [ABSTRACT FROM AUTHOR]
- Published
- 2008
- Full Text
- View/download PDF
7. A New Edge-based Intra-field Interpolation Method for Deinterlacing Using Locally Adaptive-thresholded Binary Image.
- Author
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Dong-Ho Lee
- Subjects
NUMERICAL analysis ,PAPER ,COMPUTER simulation ,SIMULATION methods & models ,ELECTROMECHANICAL analogies ,COMPUTERS ,MATHEMATICAL models ,DEFECT correction methods (Numerical analysis) ,MATHEMATICAL analysis - Abstract
This paper proposes a new method to improve re performance of intra-field interpolation which is the mos~ important element of deinterlacing method. Traditional edge- based methods were poor at determining accurate edge iirection which decides interpolation performance. The 7roposed method decides the direction and slope of edge based on locally adaptive-thresholded binary image to mprove efficiency and accuracy, and it also increased the ~orizontal size of search window to 15 for better direction ietermination at gentle slope. Compared to traditional edge- based methods, interpolation based on binary image, which is ,`enerated using the proposed method, leads to great erformance improvement. With computer simulations for a ~`ariety of images, this paper shows the new approach is much ~etter than traditional methods.. [ABSTRACT FROM AUTHOR]
- Published
- 2008
- Full Text
- View/download PDF
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