4,823 research outputs found
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
What Can Be Learned About the Economies of China and India from Purchasing Power Comparisons?
Comparisons of India and China have been made for over 50 years. This paper focuses on purchasing power estimates in China and India in the 2005 round of the UN International Comparison Programme (ICP) that was coordinated by the World Bank, the Regional Banks and Economic Commissions. The 2005 ICP round provides estimates of purchasing power parities (PPPs) of currencies and real product per capita for 146 countries, and the results for China and India are discussed in the context of the size of these economies. It also provides insights into the prospects of future economic growth in China and India as also policy recommendations for China and the likely scenarios in the future.purchasing power, China, India, economic growth, Tertiary Sector, capital stock
Measuring and analyzing aggregate fluctuations: the importance of building from microeconomic evidence - commentary
Employment (Economic theory) ; Investments ; Productivity
Regional Output Differences in International Perspective
purchasing power parities, regional price levels, spatial models
To transduce a zebra finch: interrogating behavioral mechanisms in a model system for speech.
The ability to alter neuronal gene expression, either to affect levels of endogenous molecules or to express exogenous ones, is a powerful tool for linking brain and behavior. Scientists continue to finesse genetic manipulation in mice. Yet mice do not exhibit every behavior of interest. For example, Mus musculus do not readily imitate sounds, a trait known as vocal learning and a feature of speech. In contrast, thousands of bird species exhibit this ability. The circuits and underlying molecular mechanisms appear similar between disparate avian orders and are shared with humans. An advantage of studying vocal learning birds is that the neurons dedicated to this trait are nested within the surrounding brain regions, providing anatomical targets for relating brain and behavior. In songbirds, these nuclei are known as the song control system. Molecular function can be interrogated in non-traditional model organisms by exploiting the ability of viruses to insert genetic material into neurons to drive expression of experimenter-defined genes. To date, the use of viruses in the song control system is limited. Here, we review prior successes and test additional viruses for their capacity to transduce basal ganglia song control neurons. These findings provide a roadmap for troubleshooting the use of viruses in animal champions of fascinating behaviors-nowhere better featured than at the 12th International Congress
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