Method and device for detection of surface discontinuities or defects

Surface discontinuities of defects such as cracks and orifices are detected by applying a penetrating fluid, preferably a liquid, to a test surface so as to cause the liquid to penetrate any minute cracks or opening in the surface, removing the excess liquid from the surface, and leaving a residual in the discontinuities, cavities, or in the subsurface materials. A sheet of porous material impregnated with a sensitizing medium which will react with vapors of the residual liquid to form a visible pattern is applied to the test surface. The residual liquid trapped in the discontinuities, cavities, or subsurface material is vaporized, and, as the vapors contact the sensitizing medium on the sheet, a pattern corresponding to the discontinuity is formed on the sheet material and the penetrant completely removed from the sample

Intellectual Property Rights and Innovation in Developing Countries: Evidence from Panel Data

The determinants of innovation and the role of intellectual property rights in different countries are not well understood. This paper estimates the determinants of innovation using a new panel dataset. It compares different panel estimation methods appropriate for finite size samples. Past R&D investments have a positive and significant impact on current innovation, demand-pull factors are also important in all country groups, and the structure of the economy has a negative (positive) impact in developing (industrialized) countries. Intellectual property protection is only significant for developing countries. The least-square dummy variable corrected estimator is found to be the most appropriate for small, unbalanced datasets. We discuss econometric issues and the policy implication of these results.Research and Development/Tech Change/Emerging Technologies,

Thermal insulation attaching means

An improved isolation system is provided for attaching ceramic tiles of insulating material to the surface of a structure to be protected against extreme temperatures of the nature expected to be encountered by the space shuttle orbiter. This system isolates the fragile ceramic tiles from thermally and mechanically induced vehicle structural strains. The insulating tiles are affixed to a felt isolation pad formed of closely arranged and randomly oriented fibers by means of a flexible adhesive and in turn the felt pad is affixed to the metallic vehicle structure by an additional layer of flexible adhesive

2D radiative modelling of He I spectral lines formed in solar prominences

We present preliminary results of 2D radiative modelling of He I lines in solar prominences, using a new numerical code developed by us (Leger, Chevallier and Paletou 2007). It treats self-consistently the radiation transfer and the non-LTE statistical equilibrium of H and, in a second stage, the one of He using a detailed atomic model. Preliminary comparisons with new visible plus near-infrared observations made at high spectral resolution with THeMIS are very satisfactory.Comment: 4 pages, 2 figures (to appear in the Procs. of Solar Polarization Workshop #5, eds. Berdyugina, Nagendra and Ramelli), revised +2 citations, better figure

Language and migration : the impact of the Jukun on Chadic speaking groups in the Benue-Gongola basin

Our paper deals with the problems of migration, culture and language in the wider Benue-Gongola basin. Here are mainly concerned the West-Chadic speaking groups Kwami, Kupto, Kushi and Piya as well as the Jukun who speak a language belonging to the Benue-Congo family. We try to point out the possible reasons for their historical migrations and in particular the consequences of ethnic expansion of the Jukun in the middle Benue region. History shows that contacts of ethnic groups - being peaceful or by force - had always led to mutual influences and changes in culture and language, which finally resulted in cultural fusion of various aspects. Our study, based mainly on oral traditions as well as on linguistic comparisons, focusses especially on the history of the above mentioned Chadic groups, who are considered - according to our hypothesis - to have come in close contact with the Jukun. Subsequently the warlike expansion of the Jukun caused a strong turmoil which led to the scattering of the various ethnic units

Oxygen atom reaction with shuttle materials at orbital altitudes

Surfaces of materials used in the space shuttle orbiter payload bay and exposed during STS-1 through STS-3 were examined after flight. Paints and polymers, in particular Kapton used on the television camera thermal blanket, showed significant change. Generally, the change was a loss of surface gloss on the polymer with apparent aging on the paint surfaces. The Kapton surfaces showed the greatest change, and postflight analyses showed mass loss of 4.8 percent on STS-2 and 35 percent on STS-3 for most heavily affected surfaces. Strong shadow patterns were evident. The greatest mass loss was measured on surfaces which were exposed to solar radiation in conjunction with exposure in the vehicle velocity vector. A mechanism which involves the interaction of atomic oxygen with organic polymer surfaces is proposed. Atomic oxygen is the major ambient species at low orbital altitudes and presents a flux of 8 x 10 to the 14th power atoms/cu cm sec for reaction. Correlation of the expected mass loss based on ground-based oxygen atom/polymer reaction rates shows lower mass loss of the Kapton than measured. Consideration of solar heating effects on reaction rates as well as the high oxygen atom energy due to the orbiter's orbital velocity brings the predicted and measured mass loss in surprisingly good agreement. Flight sample surface morphology comparison with ground based Kapton/oxygen atom exposures provides additional support for the oxygen interaction mechanism

Parental Illness and the Labour Supply of Adult Children

An important demographic trend is the aging of the population. As a result, demand for health care services for the sick and elderly is likely to increase. Since care for the sick and elderly is often provided informally by family members, parental illness may have important implications for the labour supply of adult children. Although previous studies show a negative relationship between hours worked and caregiving, they do not account for the potential endogeneity of the parental living arrangement to the child's labour supply. Using panel data and controlling for such endogeneity, I find that caregiving and cohabiting with a sick, elderly parent appear to have smaller effects on labour supply than the past literature suggests. Nonetheless, since cohabiting with a sick elderly parent does have negative effects on the labour supply of women and given that this form of living arrangement is relatively common, the aggregate costs associated with informal caregiving in an intergenerational living arrangement are considerable.aging; labour supply