4,319 research outputs found
The Extraterritorial Application of the Fifth Amendment Protection against Coerced Self-Incrimination
Get PDFReview of Boston Confucianism: Portable Tradition in the Late-Modern World by Robert Cummings Neville
Get PDFThe effect of prewhirl on the internal aerodynamics and performance of a mixed flow research centrifugal compressor
Get PDFThe internal three-dimensional steady and time-varying flow through the diffusing elements of a centrifugal impeller were investigated using a moderate scale, subsonic, mixed flow research compressor facility. The characteristics of the test facility which permit the measurement of internal flow conditions throughout the entire research compressor and radial diffuser for various operating conditions are described. Results are presented in the form of graphs and charts to cover a range of mass flow rates with inlet guide vane settings varying from minus 15 degrees to plus 45 degrees. The static pressure distributions in the compressor inlet section and on the impeller and exit diffuser vanes, as well as the overall pressure and temperature rise and mass flow rate, were measured and analyzed at each operating point to determine the overall performance as well as the detailed aerodynamics throughout the compressor
Forecast accuracy and monetary policy
Get PDFAn examination of GNP forecasts and their implications for monetary policy, showing that although such forecasts have lessened uncertainty about the economy's future course, the errors are still too large to justify basing monetary policy on the near-term GNP outlook alone.Monetary policy ; Forecasting
Comparing inflation expectations of households and economists: is a little knowledge a dangerous thing?
Get PDFA comparison of the performance of forecasts by economists (the Livingston survey), households (the Michigan Survey of Consumer Finances), and a time series model (ARIMA).Rational expectations (Economic theory) ; Inflation (Finance) ; Forecasting
Femtosecond few- to single-electron point-projection microscopy for nanoscale dynamic imaging
Get PDFFemtosecond electron microscopy produces real-space images of matter in a series ofultrafast snapshots. Pulses of electrons self-disperse under space-charge broadening,so without compression, the ideal operation mode is a single electron per pulse. Here,we demonstrate femtosecond single-electron point projection microscopy (fs-ePPM)in a laser-pump fs-e-probe configuration. The electrons have an energy of only150 eV and take tens of picoseconds to propagate to the object under study.Nonetheless, we achieve a temporal resolution with a standard deviation of 114 fs(equivalent to a full-width at half-maximum of 269 +/- 40 fs) combined with a spatialresolution of 100 nm, applied to a localized region of charge at the apex of a nanoscalemetal tip induced by 30 fs 800 nm laser pulses at 50 kHz. These observations demonstratereal-space imaging of reversible processes, such as tracking charge distributions,is feasible whilst maintaining femtosecond resolution. Our findings could find applicationas a characterization method, which, depending on geometry, could resolve tensof femtoseconds and tens of nanometres. Dynamically imaging electric and magneticfields and charge distributions on sub-micron length scales opens new avenues ofultrafast dynamics. Furthermore, through the use of active compression, such pulsesare an ideal seed for few-femtosecond to attosecond imaging applications which willaccess sub-optical cycle processes in nanoplasmonics
Velocity map imaging of femtosecond laser induced photoelectron emission from metal nanotips
Get PDFA novel application of velocity-map imaging (VMI) is demonstrated, whereby the momentum distribution of photoelectrons ejected from a tungsten nanoscale metal tip (< 50 nm radius) is recorded following illumination with an ultrafast laser pulse. The electrostatic conditions in the VMI instrument are optimized through finite element modelling, taking into account a physically realistic geometry including all conductive elements in the vicinity of the electron trajectories. The instrument is calibrated by observing above threshold ionization in krypton gas, and simultaneous electron emission from this gas and a tungsten nanotip is presented, illustrating that the velocity mapping condition is maintained. Realizing photoelectron VMI for femtosecond laser illuminated nanoscale objects will have a significant impact on the emerging field of ultrafast nanoplasmonics and will influence the development of such devices as a source of coherent pulses of electrons with applications in time-resolved microscopy, holography and diffractive imaging
TRANSITION AND FOOD CONSUMPTION
Get PDFThis paper examines why transition from planned to market economies in the countries of the former Soviet bloc has changed their mix and volumes of food consumption. During transition, consumption of high value products, such as meat and dairy products, has plummeted, while consumption of staple foods such as bread and potatoes has remained steady, or even increased. The paper shows that in the pre-reform planned economy, planners "desired" the production and national consumption of high value (and cost) foodstuffs more than consumers. When market reform resulted in consumer prices adjusting to reflect the full cost of production, consumer demand switched from high cost foods to other goods and services. The demand-driven nature of food restructuring in these countries has implications for food security, reinforcing the argument that any food security problems are not mainly the result of inadequate aggregate supplies of agricultural products.Food Consumption/Nutrition/Food Safety,
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