SRI International
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Origin of the tunable open circuit voltage in ternary blend bulk heterojunction organic solar cells
Ternary blend bulk heterojunction organic solar cells comprising two polythiophene polymer donors or two fullerene acceptors are shown to have unique electronic properties.
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Electronic structure and mobility of alkylated and nonalkylated organic semiconductors: role of van der Waals interactions
We present a comparison based on first-principles calculations of the electronic structure of nonalkylated and alkylated dinaphtho[2,3-b:2,3-f]thieno[3,2-b]thiophene: DNTT and DNTT-C10.
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Flow cytometry on a chip
After a brief review of some new technologies important for on the flow anayte characterization we will describe an optical detection technique termed spatially modulated fluorescence emission developed at PARC which can delivers high signal-to-noise discrimination without precision optics to enable a flow cytometer that can combine high performance, robustness, compactness, low cost, and ease…
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Persistent photoconductivity effects in printed n-channel organic transistors
Persistent photoconductivity of top-gate n-type organic transistors is investigated, as the irradiation of light leads to a negative shift in transistor threshold voltage and an increase in subthreshold current.
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Early childhood language interventions: An illustration of the model demonstration process
This project brief summarizes the characteristics, implementation experiences, and outcomes achieved by one of OSEP’s investments in model demonstration activities—a cohort of three grantees that demonstrated various approaches to implementing early childhood language interventions that targeted children with significant language disorders or delays and who were eligible for early intervention services.
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A review of literature: Mix it up with blended learning in K-12 schools
The term “blended learning” represents a wide spectrum of delivery options, tools, and pedagogies, but conceptually refers to instruction that is a mix or blending of traditional face-to-face (f2f) and online components.
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Positive Results When Preschoolers Use Media-Rich Math Curriculum Supplement
SRI Education and Education Development Center (EDC) recently released findings from our large experimental field study of a PBS KIDS mathematics curriculum supplement. The PBS curriculum supplement features use of “transmedia”—with familiar characters, settings and stories appearing across different platforms, such as video and interactive games. The study’s findings can inform the conversations that parents, teachers, policy…
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Measuring Flow Complexity in Videos
In this paper a notion of flow complexity that measures the amount of interaction among objects is introduced and an approach to compute it directly from a video sequence is proposed.
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A Role for Cortical nNOS/NK1 Neurons in Coupling Homeostatic Sleep Drive to EEG Slow Wave Activity
These findings support the hypothesis that cortical nNOS/NK1 neurons translate homeostatic sleep drive into up-regulation of NREM δ power through an NO-dependent mechanism.
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Comparison of Ionospheric Drift and Magnetic Deflections on the Ground
We conclude that a sunward magnetic contribution on the order of 50 nT caused by magnetospheric currents is needed to explain the offset.
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Dynamic Pooling for Complex Event Recognition
Complex events are defined as events composed of several characteristic behaviors, whose temporal configuration can change from sequence to sequence.
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Ion-Neutral Coupling in Earth’s Thermosphere, Estimated from Concurrent Radar and Optical Observations above Alaska
We report on data collected during the campaign, and use these data to investigate two key aspects of ion–neutral coupling, namely Joule heating and the ion–neutral collision frequency.