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101.
Richardson G; King JR 《The Quarterly Journal of Mechanics and Applied Mathematics》2007,60(2):161-200
We consider a steady flow driven by pushing a finger of gasinto a highly shear-thinning power-law fluid, with exponentn, in a Hele-Shaw channel. We formulate the problem in termsof the streamfunction , which satisfies the p-Laplacian equation (with ), and investigate travelling wave solutions in the large-n (extreme shear-thinning) limit.We take a Legendre transform of the free-boundary problem for, which reduces it to a linear problem on a fixed domain. The solution to this problem is foundby using matched asymptotic expansions and the resulting shapeof the finger deduced (being, to leading order, a semi-infinitestrip). The nonlinear problem for the streamfunction is alsotreated using matched asymptotic expansion in the physical plane.The finger-width selection problem is briefly discussed in termsof our results. 相似文献
102.
Abstract Humic substances are the major organic constituents of soils and sediments. They also occur in small concentrations in natural surface waters and groundwaters. They form through the breakdown of plant and animal tissues by chemical and biological processes that tend to produce complex chemical structures that are more stable than the original material from which they were derived. One of the more important characteristics of humic substances is their ability to form water-soluble and water-insoluble complexes with metal ions and hydrous oxides and to interact with clay minerals and various organic compounds such as alkanes, fatty acids, and toxic organic substances such as pesticides. 相似文献
103.
Advances in the environmental analysis of polychlorinated naphthalenes and toxaphene 总被引:1,自引:0,他引:1
Recent advances in the analysis of the chlorinated environmental pollutants polychlorinated naphthalenes (PCNs) and toxaphene
are highlighted in this review. Method improvements have been realized for PCNs over the past decade in isomer-specific quantification,
peak resolution, and the availability of mass-labeled standards. Toxaphene method advancements include the application of
new capillary gas chromatographic (GC) stationary phases, mass spectrometry (MS), especially ion trap MS, and the availability
of Standard Reference Materials that are value-assigned for total toxaphene and selected congener concentrations. An area
of promise for the separation of complex mixtures such as PCNs and toxaphene is the development of multidimensional GC techniques.
The need for continued advancements and efficiencies in the analysis of contaminants such as PCNs and toxaphene remains as
monitoring requirements for these compound classes are established under international agreements. 相似文献