There is a repulsive force, the attractive force between ions of opposite charge is offset by a repulsive force due to electron cloud interactions.

有一个斥力时,存在于电性不同的离子间的引力,是可以被抵消的，因为电子可以相互影响。

麻省理工公开课 - 固态化学导论课程节选

Some vendors, such as Red Hat and Rackspace, are consciously positioning themselves as advocates of an open cloud built around open source, and foresee great benefits accruing to the enterprises that can charge into the cloud without being locked in to a particular vendor, particularly when it comes to cloud infrastructure.

FORBES: Red Hat's Formula for an Open Cloud

On why Business ByDesign so far has been limited to 1, 000 customers: He says they will go much stronger into the market with Lars in charge of the cloud.

FORBES: CeBIT: SAP Meets The Press; HANA, Mobile And The Cloud

Dishwashers and water heaters that are programmed to do most of their high energy tasks at night, for instance, or Ford's Value charging system, which leverages a cloud database to charge electric vehicles when utility rates are at their lowest.

ENGADGET