排序方式: 共有23条查询结果,搜索用时 15 毫秒
1.
Optical birefringence of the spatial dispersion type has been observed in cubic ZnSe crystals. 相似文献
2.
3.
Mathematische Annalen - 相似文献
4.
O. Kvernvold V. Vindøy T. Søntvedt A. Saasen S. Selmer-Olsen 《International Journal of Multiphase Flow》1984,10(4):441-457
An experimental device for measurement of the velocity distribution in a two-phase slug is developed. Velocity profiles both in the film and the liquid slug besides velocity variation along the pipe bottom (at a distance of 1 mm) through the slug front are presented. 相似文献
5.
Geir Ellingsrud Stein Arild Strø mme 《Transactions of the American Mathematical Society》1998,350(6):2547-2552
We compute the intersection number between two cycles and of complementary dimensions in the Hilbert scheme parameterizing subschemes of given finite length of a smooth projective surface . The -cycle corresponds to the set of finite closed subschemes the support of which has cardinality 1. The -cycle consists of the closed subschemes the support of which is one given point of the surface. Since is contained in , indirect methods are needed. The intersection number is , answering a question by H. Nakajima.
6.
7.
8.
Per Arild Kjølseth Andresen Xiaoli Yang Johan Sjöblom Harald Linga Finn P. Nilsen 《Journal of Dispersion Science and Technology》2013,34(1-2):187-196
The droplet size distribution (DSD) of unstable water/oil dispersions has been studied with a new technique. The technique is based on a fast dilution of the dispersion injected into an analysis vessel where the DSD is analyzed with a video camera and a image analyzing tool. Dispersions generated with no pressure drop in the flow rig were compared to those generated with a pressure drop over a needle valve. The latter dispersion showed a much narrower DSD and a lower average droplet diameter. The results are from preliminary experiments in order to evaluate the method. 相似文献
9.
Geir Ellingsrud Stein Arild Strø mme 《Journal of the American Mathematical Society》1996,9(1):175-193
We outline a strategy for computing intersection numbers on
smooth varieties with torus actions using a residue formula of Bott. As an example, Gromov-Witten numbers of twisted cubic and elliptic quartic curves on some general complete intersection in projective space are computed. The results are consistent with predictions made from mirror symmetry computations. We also compute degrees of some loci in the linear system of plane curves of degrees less than 10, like those corresponding to sums of powers of linear forms, and curves carrying inscribed polygons.
smooth varieties with torus actions using a residue formula of Bott. As an example, Gromov-Witten numbers of twisted cubic and elliptic quartic curves on some general complete intersection in projective space are computed. The results are consistent with predictions made from mirror symmetry computations. We also compute degrees of some loci in the linear system of plane curves of degrees less than 10, like those corresponding to sums of powers of linear forms, and curves carrying inscribed polygons.
10.
Creating lasso-solutions for the traveling salesman problem with pickup and delivery by Tabu search 总被引:2,自引:0,他引:2
We consider the Traveling Salesman Problem with Pickup and Delivery (TSPPD) where the same costumers might require both deloverie
of goods and pickup of other goods. All the goods should be transported from/to the same depot. A vehicle on a TSPPD-tour
could often get some practical problems when arranging the load. Even if the vehicle has enough space for all the pickups,
one has to consider that they are stored in a way that doesn't block the delivery for the next customer. In real life problems
this occurs for instance for breweries when they deliver bottles of beer or mineral water and collects empty bottles from
the same customers on the same tour. In these situations we could relax the constraints of only checking Hamiltonian tours,
and also try solutions that can visit customers in a way giving rise to a ‘alsso’ model. A solution which first only delivers
bottles until the vehicle is partly unloaded, then do both delivery and pickup at the remaining customers and at last picks
up the empty bottle from the first visited customers, could in these situations be better than a pure Hamiltonian tour, at
least in a practical setting. To find such solutions, we will use the metaheuristic Tabu Search on some well known TSPPD-problems,
and compare them to other kinds of solutions on the same problems. 相似文献