Biomedical subjects

J Banister

Publications and source records attributed to J Banister.

11 recordsLinked to original sources

PubMed2005

Efficient radiation production in long implosions of structured gas-puff Z pinch loads from large initial radius.

We have proposed and demonstrated successfully a new approach for generating high-yield K-shell radiation with large-diameter gas-puff Z pinches. The novel load design consists of an outer region plasma that carries the current and couples energy from the driver, an inner region plasma that stabilizes the implosion, and a high-density center jet plasma that radiates. It increased the Ar K-shell yield at 3.46 MA in 200 ns implosions from 12 cm initial diameter by a factor of 2, to 21 kJ, matching the yields obtained earlier on the same accelerator with 100 ns implosions. A new "pusher-stabilizer-radiator" physical model is advanced to explain this result.

Journal Article↗

PubMed1995

Demographic perspectives on China and India.

This paper compares levels and trends of population growth rates, age and sex composition, mortality, and fertility including family planning practices in the world's two most populous countries, China and India. Both countries are undergoing demographic transition but China is nearer than India to achieving a stationary population. Fertility in China has declined below replacement level while in India it is nearly one and a half children per woman above replacement level. Both countries have achieved large reductions in mortality but life expectancy at birth in China is currently about 10 years longer than in India. Both countries have young populations but China will precede India in the aging of population structure during the 21st century.

Adolescent↗

PubMed1994

Five decades of missing females in China.

This paper seeks to explain the dearth of females in the population of China in cohorts born from the late 1930s to the present. We demonstrate that in virtually all cohorts, the shortage of females in comparison with males is revealed when the cohort is first enumerated in a census. Subsequently it barely changes, an indication that female losses occur very early in life. Using the high-quality data from the censuses and fertility surveys in China, we show that many of the births of the girls missing in the censuses were not reported in the surveys because they died very young. The incidence of excess early female mortality (probably infanticide) declined precipitously in the Communist period, but not to zero. The recent escalation in the proportion of young females missing in China has been caused largely by rapidly escalating sex-selective abortion.

Abortion, Legal↗

PubMed1989

China: surplus labour and migration.

Surplus labor force and migration trends in China are examined, with emphasis on the impact of underemployment in rural areas. "Government policy encourages surplus labourers to transfer out of crop farming into agricultural sidelines or non-agricultural work. Peasants are urged to stay where they are, shifting jobs without shifting location; however, many rural areas are poorly endowed for providing alternative employment, so their surplus workers must also leave the village to find work. Many do not formally migrate, but rather move on a seasonal basis or set up 'temporary' residence in an urban place. This 'floating' population has been escalating rapidly in recent years....[The authors argue] that China's cities and towns can absorb millions of surplus labourers from rural areas each year, to the mutual benefit of sending and receiving areas."

Agriculture↗

PubMed1988