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Los Documentos de Trabajo se distribuyen gratuitamente a las Universidades e Instituciones de Investigación que lo solicitan. No obstante están disponibles en texto completo a través de Internet: These Working Documents are distributed free of charge to University Department and other Research Centres. They are also available through Internet: Abstract(More)
Computerized working memory and executive function training programs designed to target specific impairments in executive functioning are becoming increasingly available, yet how well these programs generalize to improve functional deficits in disorders, such as attention-deficit/hyperactivity disorder (ADHD), beyond the training context is not(More)
What explains the current low rate of employment in the US? While there has substantial debate over this question in recent years, we believe that considerable added insight can be derived by focusing on changes in the labour market at the turn of the century. In particular, we argue that in about the year 2000, the demand for skill (or, more specifically,(More)
We examine the behaviour of the nonparametric maximum likelihood estimator (NPMLE) for a discrete duration model with un-observed heterogeneity and unknown duration dependence. We find that a nonparametric specification of either the duration dependence or unobserved heterogeneity, when the other feature of the hazard is known to be absent, leads to(More)
The baby boom and subsequent baby bust in the United States resulted in dramatic shifts in the age composition of the American population. Japan, Germany, and other industrialized countries have experienced similarly dramatic demographic change during the postwar period, although the details regarding timing and nature differ from place to place. In this(More)
How Much Does Immigration Boost Innovation? We measure the extent to which skilled immigrants increase innovation in the United States by exploring individual patenting behavior as well as state-level determinants of patenting. The 2003 National Survey of College Graduates shows that immigrants patent at double the native rate, and that this is entirely(More)
OBJECTIVE To report oncologic outcomes and complications after robotic-assisted radical cystectomy (RARC). MATERIALS AND METHODS From March 2004 to August 2011, 175 consecutive patients underwent RARC with extracorporeal urinary diversion at our institution by a single surgeon. The study design was prospective. Perioperative parameters and postoperative(More)
After a century of remarkable growth, female labor force participation (FLP) has leveled-off in the late 1990s, despite continuous improvement in some fundamental economic variables, such as educational attainment. Using data from the 1977-2006 General Social Surveys (GSS) and an economic identity theory framework, this paper studies the impact of changing(More)
Advances of nanoscale science have produced nanomaterials with unique physical and chemical properties at commercial levels which are now incorporated into over 1000 products. Nanoscale cerium (di) oxide (CeO(2)) has recently gained a wide range of applications which includes coatings, electronics, biomedical, energy and fuel additives. Many applications of(More)
BACKGROUND/OBJECTIVES A large number of labourers work in the stone-crushing industry in India. Many of these workers are also exposed to high levels of particulate matter in their homes from the use of biomass fuels. As part of our investigations to examine the health of these workers we characterised their exposure to respirable crystalline silica and a(More)