Is the large U.S. current account deficit sustainable?

The U.S. current account deficit has grown steadily since 1991, hitting record levels of 3.6 percent of GDP in 1999 and 4.4 percent in 2000. In recent years, the growing deficits have increasingly raised concerns. For instance, most economists who took part in a recent Wall Street Journal forecasting survey agreed that the current account deficit is the major threat facing the U.S. economy. Some policymakers have also suggested that the large and growing U.S. current account deficit may be unsustainable and thus may create problems for the economy.> Holman examines the causes and consequences of the large current account deficits in the United States. She identifies the potential sources of the large deficits. Much of the rise in the current account deficit over the past decade can be attributed to two factors: accelerating U.S. productivity and a surge in household wealth driven by the stock market. She then examines whether the U.S. current account deficit is sustainable in the near term. In this analysis, an unsustainable deficit is defined as one that triggers a sharp hike in interest rates, a rapid depreciation of the dollar, or some other domestic or global economic disruption. She concludes that, over the near term, deficits of roughly the current magnitude are sustainable and therefore unlikely to disrupt the U.S. economy.Deficit financing

Pioneer Venus spacecraft charging model

Five environmental models were constructed to represent the solar wind and the upper, middle, and lower ionosphere of Venus. The spacecraft structure was modeled with over 140 passive electrical elements representing structural elements of the spacecraft. Electron, ion, secondary electron, and photocurrents to the spacecraft from the plasma were calculated, ignoring sheath effects. In all but one case, potentials of interest were less than 1 volt. Potential differences between widely separated points on the equipment shelf were less than 1 mV. The one area of concern is the solar panel potential when the orbiter is passing through the bowshock region

Estimates of the number of adults in England, Wales, and Scotland with a hearing loss

No abstract available

Feasibility of modifying the high resolution infrared radiation sounder (HIRS/2) for measuring spectral components of Earth radiation budget

The concept of adding four spectral channels to the 20 channel HIRS/2 instrument for the purpose of determining the origin and profile of radiant existence from the Earth's atmosphere is considered. Methods of addition of three channels at 0.5, 1.0 and 1.6 micron m to the present 0.7 micron m visible channel and an 18-25 micron m channel to the present 19 channels spaced from 3.7 micron m to 15 micron m are addressed. Optical components and physical positions were found that permit inclusion of these added channels with negligible effect on the performance of the present 20 channels. Data format changes permit inclusion of the ERB data in the 288 bits allocated to HIRS for each scan element. A lamp and collimating optic assembly may replace one of the on board radiometric black bodies to provide a reference source for the albedo channels. Some increase in instrument dimensions, weight and power will be required to accommodate the modifications

Testing Broken U(1) Symmetry in a Two-Component Atomic Bose-Einstein Condensate

We present a scheme for determining if the quantum state of a small trapped Bose-Einstein condensate is a state with well defined number of atoms, a Fock state, or a state with a broken U(1) gauge symmetry, a coherent state. The proposal is based on the observation of Ramsey fringes. The population difference observed in a Ramsey fringe experiment will exhibit collapse and revivals due to the mean-field interactions. The collapse and revival times depend on the relative strength of the mean-field interactions for the two components and the initial quantum state of the condensate.Comment: 20 Pages RevTex, 3 Figure

Ultrapure glass optical waveguide development in microgravity by the sol-gel process

Multicomponent, homogeneous, noncrystalline oxide gels can be prepared by the sol-gel process and these gels are promising starting materials for melting glasses in the space environment. The sol-gel process referred to here is based on the polymerization reaction of alkoxysilane with other metal alkoxy compounds or suitable metal salts. Many of the alkoxysilanes or other metal alkoxides are liquids and thus can be purified by distillation. The use of gels offers several advantages such as high purity and lower melting times and temperatures. The sol-gel process is studied for utilization in the preparation of multicomponent ultrapure glass batches for subsequent containerless melting of the batches in space to prepare glass blanks for optical waveguides

Patents from government-financed research and development

Data on numbers, sources, and kinds of patented inventions from government financed research and developmen