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1.
Sjoerd E. Crans 《K-Theory》2003,28(1):39-105
Let
be n-dimensional teisi, i.e., higher-dimensional Gray-categorical structures. The following questions can be asked. Does a left q-transfor
, i.e., a functor 2
q
, induce a right q-transfor
, i.e., a functor
More generally, does a functor
induce a functor
For k-arrows c and
whose (k – 1)-sources and targets agree, does a q-transfor
induce a q-transfor
, for appropriate k-arrows
For k-arrows c and
whose (k – 1)-sources and targets agree, does a q-transfor
induce a (q + k + 1)-transfor
, for appropriate k-arrows
I give answers to these questions in the cases where n-dimensional teisi and their tensor product have been defined, i.e., for n 3, and for n up to 5 in some cases that do not need all data and axioms of n-dimensional teisi.I apply the above to compositions in teisi, in particular to braidings and syllepses. One of the results is that a braiding on a monoidal 2-category induces a pseudo-natural transformation
, where
is the reverse of ? –, which is almost, but not quite, equal to – ?. However, in higher dimensions need not be reversible, so a braiding on a higher-dimensional tas can not be seen as a transfor A B B A. 相似文献
2.
Fusion Operators and Cocycloids in Monoidal Categories 总被引:1,自引:0,他引:1
Ross Street 《Applied Categorical Structures》1998,6(2):177-191
The Yang–Baxter equation has been studied extensively in the context of monoidal categories. The fusion equation, which appears to be the Yang–Baxter equation with a term missing, has been studied mainly in the context of Hilbert spaces. This paper endeavours to place the fusion equation in an appropriate categorical setting. Tricocycloids are defined; they are new mathematical structures closely related to Hopf algebras. 相似文献
3.
纺织结构复合材料力学性能的实验研究 总被引:13,自引:1,他引:13
本文通过实验测定了三维编织结构复合材料侧边未切割、受切割和中央钻孔试件的拉伸性能,对比了受切割和未切割纤维对于试件侧边拉伸应变的影响,并且讨论了拉伸失效的机理和原因.发现受切割和钻孔试件的拉伸性能低于未加工试件的性能,受切割侧边的拉伸应变高于未切割侧边的拉伸应变,三维编织结构复合材料的拉伸失效主要由纤维断裂引起的.文中还对三维编织结构复合材料的孔边应力集中现象进行了研究,并进行了深入分析,得到一个重要结论,即四步法复合材料的孔边应力集中系数比传统层板复合材料和金属材料的低.从这个意义上说,三维编织结构复合材料适合于作为含孔结构的连接件. 相似文献
4.
对于纵横编织步进编织中的步长选取规律用精确的数学语言描述 ,并给出其严格的数学证明 ,为进一步设计和实现纵横编织技术提供了理论基础 . 相似文献
5.
6.
The acoustic emission (AE) method was used to monitor the tensile damage in a 3D braiding composite shaft. The 3D braiding composite shaft was manufactured via Vacuum Assisted Resin Transfer Moulding (VARTM) and the tensile experiment was conducted accompanied by AE monitoring. The AE signals were analyzed using the wavelet transformation for time-frequency analysis. The characteristic values of the AE signals were decomposed by the principal component analysis (PCA). The damage mode of the 3D braiding composite shaft under tension was identified and classified by the fuzzy clustering method (FCM). The results showed that the AE method could monitor the damage evolution process of the 3D braiding composite shaft under tension and the FCM combined with the PCA effectively divided the damage mode of the 3D braiding composite shaft. The results will provide an effective method for health monitoring of the 3D braiding composite shaft within engineering. 相似文献
7.
By virtue of the two-layer picture of Pfaffian pair Hall state, a qubit representation of topological degeneracy for quasiholes excitation is displayed. The non-Abelian feature of states can be manifested readily by the new wave functions. The virtue of this approach is that one does not need to find the equalities of Pfaffians, which is a so tedious task as exemplified for the case of six quasiholes. Then the braiding matrices are also constructed readily by just permutating single-qubit states, which are unitary and hermite. 相似文献
8.
V. L. Kulakov Yu. M. Tarnopol’skii D. D. Mungalov A. I. Beyle 《Mechanics of Composite Materials》2000,36(3):199-206
The effective deformative characteristics of spatially reinforced composites made by spatial braiding along the generatrices
of a one-sheet hyperboloid are analyzed. The geometrical relationships determining the structure of a unit cell of a braided
composite are derived. The effective thermoelastic characteristics are calculated by the method of orientational averaging.
The dependences of the bending and torsional stiffnesses of thick-walled cylindrical rods — made by the method suggested and
by winding — on the braiding/winding angle are compared. The numerical estimations are given for rods made of carbon (CFRP)
and aramid (AFRP) epoxy plastics.
Submitted to the 11th International Conference on Mechanics of Composite Materials (Riga, June 11–15, 2000).
Translated from Mekhanika Kompzitnykh Materialov, Vol. 36, No. 3, pp. 341–354, May–June, 2000. 相似文献
9.
We study entanglement swapping in continuous variable systems by using braiding transformations. It is found that entanglement swapping in two-mode squeezed vacuum states and squeezed coherent states can be realized based on the braiding operators. 相似文献
10.
Yu. M. Tarnopol'skii V. L. Kulakov D. D. Mungalov 《Mechanics of Composite Materials》1999,35(5):365-372
The advisability of application of advanced composites in deep-water offshore technology is shown using risers and tendons
as examples. Numerical estimations of the parameters of multilayered metal-composite risers are obtained. Two new processes
of spatial braiding for creating the external jackets of compound tendons are considered. Advanced composites are the only
possible choice for exploitation of deposits at depths greater than 1500 m. That is why they are the most promising structural
materials for offshore technology in the next century.
This report was presented at the Symposium “Composites for the Next Millennium” in honor of Stephen Tsai's 70th birthday,
Tours, France, 2–3 July, 1999.
Institute of Polymer Mechanics, University of Latvia, Riga, LV-1006 Latvia. Translated from Mekhanika Kompozitnykh Materialov,
Vol. 35, No. 5, pp. 549–560, September–October, 1999. 相似文献