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This article is conducting a study on the demand forecast from the x-retailers, y-distribution centers, z-suppliers supply chain of logistics area. The supply chain will be divided into upstream and downstream levels. Combined with the characteristics of the supply chain and demand characteristics of the regional logistics network, Dijkstra shortest path algorithm is used and its demand forecast model...
We report on precision laser spectroscopy of the 2S1/2(F = 0) 2D3/2 (F = 2, mF = 0) clock transition in a single ion of 171Yb+. The absolute value of the transition frequency, determined using an optical frequency comb referenced to a hydrogen maser, is 688358979309310 ?? 9 Hz. This corresponds to a fractional frequency uncertainty of 1.3 ?? 10-14.
Global climate change has significant but uncertain impacts on hydrological regimes as well as flooding patterns of a watershed, which may probably result in the enlargement of flood-prone areas and the loss of life and property. It is desired to develop effective approaches to identify optimal strategies of flooding adaptation under changing climatic conditions. In this study, a mixed integer fuzzy...
We report on precision laser spectroscopy of the 2S1/2(F = 0) - 2D3/2(F = 2, mF = 0) clock transition in a single ion of 171Yb+. The absolute value of the transition frequency, determined using an optical frequency comb referenced to a hydrogen maser, is 688 358 979 309 310 plusmn 9 Hz. This corresponds to a fractional uncertainty of 1.3 times 10-14.
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