Snap-off production of monodisperse droplets

We introduce a novel technique to produce monodisperse droplets through the snap-off mechanism. The methodology is simple, versatile, and requires no specialized or expensive components. The droplets produced have polydispersity <1% and can be as small as 2.5 $\mu$m radius. A convenient feature is that the droplet size is constant over a 100-fold change in flow rate, while at higher flows the droplet size can be continuously adjusted.Comment: to be published in Eur. Phys. J. E as a "Tips and Tricks" articl

Parenting interventions for ADHD: a systematic literature review and meta-analysis

Objective. To evaluate the evidence base relating to the effectiveness of parent-administered behavioral interventions for ADHD

Water Security in Refugee Host Communities: Syrian Refugees in Jordan

This thesis adapts a dynamic economic model of groundwater extraction to analyze the environmental impact of the Syrian refugee influx from 2013 onward on the Amman Wadi As-Sir aquifer in the northern region of Jordan. It then shows that, given model assumptions, agricultural producers in the Jordanian Highlands experience negative welfare effects as the resource is allocated away from producing sectors of the economy in order to provide for the refugee population. Finally, it discusses policy implications for increasing water security in Jordan, focusing on two fronts: long-term capacity and local capacity.Ope

An Educational Intervention to Increase Fruit and Vegetable Consumption in Parents of Obese and Overweight Children

The incidence and prevalence of overweight and obese children in the United States is a serious health concern since the complications of childhood obesity can have serious and long-term effects: cardiovascular disease, sleep apnea, type 2 diabetes, neurological disease, and pulmonary disease. Parental modeling and nutritional education focusing on the obese/overweight child’s parents has been shown as an effective strategy for improving nutritional outcomes of the recommended servings of fruits and vegetables in children from five to ten years of age. Outcomes of this study and targeted nutritional modeling included increasing vegetable and fruit consumption of the parent by at least one fruit and vegetable serving per day post-intervention through nutritional education. The project purpose was to measure the impact of a parent-focused nutritional educational intervention that increases fruit and vegetable consumption in the parents of obese and overweight children. While the study indirectly measured a nutrition education intervention aimed at children via their parents, no children were included in this project. Parents (N = 93) of obese/overweight children were provided nutritional and modeling education over three months. A participation rate of 14% (N = 13) was achieved. The majority of the parents were single African American mothers between 18 and 25 years old with one or two children living in the household, an average income less than $10,000 per year, and some college or technical education. This project used a pre-and post-test design to measure the effectiveness of a nutritional educational intervention. A descriptive analysis of the participants was computed. Differences in the pre-and post-test scores on the parental dietary modeling questionnaire and the food frequency questionnaire were analyzed. Results showed a significant increase in fruit and vegetable consumption (p \u3c .05). The majority of the increase was due to improved fruit consumption. There was also an increase in parental modeling awareness. Parents’ understanding of the importance of parental modeling had an impact on nutritional selection of their own fruit and vegetable intake

Stakeholder representation in park planning: localized place meanings at Grand Canyon

This research explores stakeholder representation in park [pre]planning at Grand Canyon National Park through an examination of place meanings from a lived experience perspective. Using a combination of photo-elicitation methods and semi-structured interviewing this research offers a novel form of representation among localized stakeholders to the backcountry at Grand Canyon and follows up on that by asking the participants about their experience with the research itself. It is found that stakeholders who participated in this process expressed a natural form of caring and sensed the same in others representation of the meanings associated with their important backcountry places. As a form of participatory action research, this research shows promise for improving stakeholder dialogue surrounding park planning through the productive inclusion of experiential, emotional knowledge

Pattern fluctuations in transitional plane Couette flow

In wide enough systems, plane Couette flow, the flow established between two parallel plates translating in opposite directions, displays alternatively turbulent and laminar oblique bands in a given range of Reynolds numbers R. We show that in periodic domains that contain a few bands, for given values of R and size, the orientation and the wavelength of this pattern can fluctuate in time. A procedure is defined to detect well-oriented episodes and to determine the statistics of their lifetimes. The latter turn out to be distributed according to exponentially decreasing laws. This statistics is interpreted in terms of an activated process described by a Langevin equation whose deterministic part is a standard Landau model for two interacting complex amplitudes whereas the noise arises from the turbulent background.Comment: 13 pages, 11 figures. Accepted for publication in Journal of statistical physic

Moderation of parenting by inhibitory control in the prediction of the common and unique variance of hyperactivity-impulsivity and inattention

This study examined whether the interaction between parenting and inhibitory control predicts hyperactivity-impulsivity and inattention in 195 children. Observation data of positive parenting were collected at 4 years, and mother reports of coercive parenting at 5 years, inhibitory control at 6 years, and hyperactivity-impulsivity/inattention at 7 years were obtained. The common and unique variance of hyperactivity-impulsivity and inattention symptoms were examined as outcomes using a bifactor model. Results indicated that positive parenting practices predicted lower levels of hyperactivity-impulsivity/inattention behaviors at age 7 only when children's inhibitory control was high. These results support the vantage sensitivity model, which posits that some individuals show an increased sensitivity to positive experiences exclusively, and support the appropriateness of a targeted prevention approach in early childhood