Strong exciton-photon coupling with colloidal nanoplatelets in an open microcavity

Colloidal semiconductor nanoplatelets exhibit quantum size effects due to their thickness of only few monolayers, together with strong optical band-edge transitions facilitated by large lateral extensions. In this article we demonstrate room temperature strong coupling of the light and heavy hole exciton transitions of CdSe nanoplatelets with the photonic modes of an open planar microcavity. Vacuum Rabi splittings of $66 \pm 1$ meV and $58 \pm 1$ meV are observed for the heavy and light hole excitons respectively, together with a polariton-mediated hybridisation of both transitions. By measuring the concentration of platelets in the film we compute the transition dipole moment of a nanoplatelet exciton to be $\mu = (575 \pm 110)$ D. The large oscillator strength and fluorescence quantum yield of semiconductor nanoplatelets provide a perspective towards novel photonic devices, combining polaritonic and spinoptronic effects.Comment: 9 pages, 4 figure

An Integrated Approach To Recruiting And Retaining Appalachian Engineering Students

Recruiting and retaining Appalachian engineering students is difficult for a variety of ecological and cultural reasons. At West Virginia University an NSF STEP grant1* has allowed the development specific interventions to evolve from an ecological model we describe here. The interventions include web-based, realistic engineering design exercises linked to state and federal content standards and objectives; a week-long residential summer camp addressing social and academic challenges for rural and minority students; a full set of retention efforts including "rescue courses" targeting struggling college freshmen in early stages of academic difficulty coupled with required study labs to underscore time management and persistence skills early in a freshman's academic career. Process and impact measures suggest that this package of interventions is effective in building interest in engineering not only in high school teachers but in the high school students themselves. While freshman retention has improved remarkably to an all time high of 84%, we conclude that it may take longer than five years to establish among youth in Appalachia an "engineering identity" as a cultural norm. We discuss the key aspects of our 5 year NSF project along with findings and conclusions

Family-centered care for hospitalized children aged 0-12 years: a systematic review of qualitative studies

The foundation for a family-centered approach to pediatric health care is the belief that a child'semotional and developmental needs, and overall family wellbeing are best achieved when the service system supports the ability of the family to meet the needs of their child by involving families in their child’s care. There are a range of potential benefits and difficulties associated with the provision of family centred care, e.g. role negotiation, parental expectations in regard to participation in their child’s care, and issues relating to power and control. Currently, however, there is limited systematic information on how the principles of family-centered care are implemented in the delivery of care to the hospitalized child and their family, and the impact on the family and the health care providers

Educating Farmers\u27 Market Consumers on Best Practices for Retaining Maximum Nutrient and Phytonutrient Levels in Local Produce

Few farmers\u27 market consumers are aware of how to retain optimal nutritional quality of produce following purchase. Our objective was to develop and evaluate educational materials intended to inform market consumers about best practices for storing, preserving, and consuming local produce to maximize nutrients and phytonutrients. Printed educational materials were developed and then evaluated via a survey of and interviews with Ohio farmers\u27 market consumers. The materials were modified to reflect consumer comments, and finalized materials were distributed to farmers\u27 markets throughout Ohio. The approach we used can be applied by other Extension professionals when developing educational materials for different audiences

Implementation and evaluation of the new wind algorithm in NASA's 50 MHz doppler radar wind profiler

The purpose of this report is to document the Applied Meteorology Unit's implementation and evaluation of the wind algorithm developed by Marshall Space Flight Center (MSFC) on the data analysis processor (DAP) of NASA's 50 MHz doppler radar wind profiler (DRWP). The report also includes a summary of the 50 MHz DRWP characteristics and performance and a proposed concept of operations for the DRWP

Law, politics and the governance of English and Scottish joint-stock companies 1600-1850

This article examines the impact of law on corporate governance by means of a case study of joint-stock enterprise in England and Scotland before 1850. Based on a dataset of over 450 company constitutions together with qualitative information on governance practice, it finds little evidence to support the hypothesis that common-law regimes such as England were more supportive of economic growth than civil-law jurisdictions such as Scotland: indeed, levels of shareholder protection were slightly stronger in the civil-law zone. Other factors, such as local political institutions, played a bigger role in shaping organisational forms and business practice