Centres of Hecke algebras: the Dipper-James conjecture

In this paper we prove the Dipper-James conjecture that the centre of the Iwahori-Hecke algebra of type A is the set of symmetric polynomials in the Jucys-Murphy operators.Comment: 27 pages. To appear J. Algebr

Failure to Advise Non-Citizens of Immigration Consequences of Criminal Convictions: Should This Be Grounds to Withdraw a Guilty Plea?

In this Article, Professor Francis argues that non-citizen criminal defendants should be afforded greater latitude in withdrawing guilty pleas, when those pleas are made without awareness of potential immigration consequences. Moreover, the Article highlights the roles both judges and attorneys should play in ensuring that non-citizens do not enter into such uninformed pleas. Noting that courts have characterized deportation as a collateral consequence of a criminal conviction, the article argues that deportation, following the passage of the Immigration and Naturalization Act of 1996, is unique in its severity and certainty. Many of the same due process considerations which underpin the requirement of advisement of direct consequences apply equally as strongly in the case of the collateral consequence of deportation; therefore, the Article argues, these policy considerations require that courts advise criminal defendants that if they are not citizens of the United States, entering a guilty plea may adversely impact their ability to stay in this country. The Article proposes that bar associations develop universal standards requiring attorneys to determine the immigration status of all clients and to properly advise non-citizen clients of deportation risks of convictions. Further, failure to comply with these minimum standards should constitute the basis of an ineffective assistance of counsel claim. Finally, the Article calls on Congress and state legislatures to amend criminal procedural rules to require that all criminal defendants be advised that if they are not United States citizens, entering a plea of guilty or no contest to crimes may adversely impact their immigration status

Linked health data for pharmacovigilance in children : Perceived legal and ethical issues for stakeholders and data guardians

Peer reviewedPublisher PD

Involvement of deprivation and environmental lead in neural tube defects:a matched case-control study.

OBJECTIVE. To analyse the prevalence of neural tube defects in small geographical areas and seek to explain any spatial variations with reference to environmental lead and deprivation. SETTING. The Fylde of Lancashire in the north west of England. DESIGNCases were ascertained as part of a prospective survey of major congenital malformations in babies born in the Fylde to residents there between 1957 and 1981. A matched case-control analysis used infants with cardiovascular system, alimentary tract, and urinary system malformations as controls. Conditional logistic regression was used to assess the effects of more than 10 µg/l lead in drinking water and the Townsend deprivation score. RESULTS. The prevalence of neural tube defects in 1957-73 was higher in Blackpool, Fleetwood, and North Fylde, whereas the three control groups showed no significant spatial variation. In 1957-81 mothers living in electoral wards with either a higher proportion of houses with more than 10 µg/l lead in the water or a higher deprivation score had a greater risk of having a baby with a neural tube defect. For spina bifida and cranium bifidum alone, this was also true. For anencephaly, deprivation was less important although the effect of lead was still seen. In some neural tube defects, lead may act independently of other possible factors associated with deprivation. It seemed unlikely that lead levels changed significantly during the survey. The percentage of houses with 10 µg/l or more of lead in the water in 1984-5 was similar to that found in Great Britain 10 years previously. CONCLUSION. There is evidence to suggest that lead is one cause of neural tube defects, especially anencephaly. This could link the known preventive actions of hard water and folic acid. Calcium is a toxicological antagonist of lead. One cause of a deficiency of folic acid is impaired absorption secondary to zinc deficiency, which may be produced or exacerbated by lead

Hydrogen arcjet technology

During the 1960's, a substantial research effort was centered on the development of arcjets for space propulsion applications. The majority of the work was at the 30 kW power level with some work at 1-2 kW. At the end of the research effort, the hydrogen arcjet had demonstrated over 700 hours of life in a continuous endurance test at 30 kW, at a specific impulse over 1000 s, and at an efficiency of 0.41. Another high power design demonstrated 500 h life with an efficiency of over 0.50 at the same specific impulse and power levels. At lower power levels, a life of 150 hours was demonstrated at 2 kW with an efficiency of 0.31 and a specific impulse of 935 s. Lack of a space power source hindered arcjet acceptance and research ceased. Over three decades after the first research began, renewed interest exists for hydrogen arcjets. The new approach includes concurrent development of the power processing technology with the arcjet thruster. Performance data were recently obtained over a power range of 0.3-30 kW. The 2 kW performance has been repeated; however, the present high power performance is lower than that obtained in the 1960's at 30 kW, and lifetimes of present thrusters have not yet been demonstrated. Laboratory power processing units have been developed and operated with hydrogen arcjets for the 0.1 kW to 5 kW power range. A 10 kW power processing unit is under development and has been operated at design power into a resistive load