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排序方式: 共有51条查询结果,搜索用时 15 毫秒
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Cellulose - The shear modulus of pulp fibers is difficult to measure and only very little literature is available on this topic. In this work we are introducing a method to measure this fiber... 相似文献
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Matthew Hirn 《Linear algebra and its applications》2010,432(5):1105-1125
Harmonic frames of prime order are investigated. The primary focus is the enumeration of inequivalent harmonic frames, with the exact number given by a recursive formula. The key to this result is a one-to-one correspondence developed between inequivalent harmonic frames and the orbits of a particular set. Secondarily, the symmetry group of prime order harmonic frames is shown to contain a subgroup consisting of a diagonal matrix as well as a permutation matrix, each of which is dependent on the particular harmonic frame in question. 相似文献
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Wolfgang J. Fischer Armin Zankel Christian Ganser Franz J. Schmied Hartmuth Schroettner Ulrich Hirn Christian Teichert Wolfgang Bauer Robert Schennach 《Cellulose (London, England)》2014,21(1):251-260
Besides the determination of the force and the energy needed to break individual fibre to fibre joints, the investigation of the formerly bonded area (FBA) is of essential importance to learn more about the failure mechanisms of fibre–fibre bonds in general. In this study the surfaces of paper fibres and the FBA of fibre–fibre joints after the determination of the breaking force as well as the bonding energy were analysed by means of low voltage scanning electron microscopy and atomic force microscopy. A comparison between the contact zone of fibres broken at different loading rates as well as under cyclic loading showed that there seems to be no significant difference in the appearance of the FBA in these cases. Only minor delamination of the cell wall could be found in the bonding zone, which indicates no mechanical interlocking of fibrils in the bonding zone. Furthermore, it is shown that some glues used for specimen preparation of fibre–fibre bond strength measurement are forming a glue film on the fiber surface and migrate into the bonding region. 相似文献
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Cellulose - Wet wipe dispersibility is broadly discussed since they have been detected in massive fatbergs that were found in sewer systems of big cities, e.g., London. Dispersibility describes a... 相似文献
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Conservative methods for the Toda lattice equations 总被引:1,自引:0,他引:1
We are concerned with the numerical integration of the Todalattice equations by using different conservative methods. Numericalexperiments suggest that the global error for isospectral schemesdecreases exponentially with time but it is almost constantfor either symplectic or more general integrators. We providea theoretical explanation for these experimental findings. 相似文献
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Franz J. Schmied Christian Teichert Lisbeth Kappel Ulrich Hirn Robert Schennach 《Cellulose (London, England)》2012,19(3):1013-1021
A method is presented which enables analysis of lignin precipitated on the surface of kraft pulp fibers. As experimental input,
high-resolution atomic force microscopy phase images of the fiber surfaces have been recorded in tapping mode. A digital image
analysis procedure—based on the watershed algorithm—is applied to distinguish between cellulose fibrils and the precipitated
lignin. In this way, size distributions for the diameter of lignin precipitates on pulp fiber surfaces can be obtained. In
an initial application of the method, three softwood kraft pulps were analyzed: a black liquor cook with a very high content
of precipitated lignin, a bleached pulp where nearly no precipitated lignin is visible and an unbleached industrial pulp.
The proposed method is suggested as an appropriate tool to investigate the kinetics of lignin precipitation and the structure
of lignin precipitates in pulping and bleaching. 相似文献
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