Linear Quadrupole Focusing for High Resolution Microdroplet-Based Fabrication

In industry, particularly in the field of rapid prototyping, droplet-based manufacturing is proving to be an extremely efficient technique for the production of low cost electronic components. However, for some applications, the desired material properties at deposition are not easily integrated with a homogeneous, low viscosity fluid suitable for droplet ejection. For this reason, it would prove beneficial to have some means of altering the material properties of the droplets during their travel to the substrate. Due to the inherent irregularities in droplet ejection systems, increases in the associated throw-distances and travel times generally cause decreased resolution in placement. Thus, the purpose of this study was to assess the potential of a linear electrodyamic quadrupole for use in constraining the trajectories of charged microdroplets to allow for modification of their material properties prior to deposition. The equations of motion for the droplets within the device were derived and integrated numerically. Approximate bounds on the system stability were determined and the effects of the respective parameters were considered. An experimental system was constructed and used for deposition experiments. The results obtained, show that a linear quadrupole can be used to focus microdroplet streams for deposition, and that the corresponding operating variables can be predicted from the governing equations

The early modern great divergence: wages, prices and economic development in Europe and Asia, 1500-1800

Contrary to the claims of Pomeranz, Parthasarathi and other ‘world historians’, the prosperous parts of Asia between 1500 and 1800 look similar to the stagnating southern, central and eastern parts of Europe rather than the developing northwestern parts. In the advanced parts of India and China, grain wages were comparable to those in northwestern Europe, but silver wages, which conferred purchasing power over tradable goods and services, were substantially lower. The high silver wages of northwestern Europe were not simply a monetary phenomenon, but reflected high productivity in the tradable sector. The ‘Great Divergence’ between Europe and Asia was already well underway before 1800