4,313 research outputs found
Arabic-English CS Ver 1
No full textArabic-English CS judgment tasks (Exp 1 & 2) testing the MLF mode
OPTICAL RECEIVER DESIGN WITH HIGH-SENSITIVITY AND HIGH DYNAMIC-RANGE USING FEEDBACK AND LOSSY NOISE-MATCHING NETWORK
No full textA new type of optical receiver design providing high sensitivity and high dynamic range is presented that employs a lossy noise-matching network and feedback type amplifier. The design is based on the noise figure concept using the four noise parameters of FET, which makes it easy to design multigigabit optical receivers by combining it with microwave CAD tools. The effects of matching network element value and group delay variation of the preamplifier on receiver sensitivities are addressed. The predicted receiver sensitivity including the effect of group delay is 27.1 dBm, which is the highest sensitivity for a 10 Gbit s-1 PIN-FET optical receiver reported to date
ELECTRICAL AND OPTICAL-PROPERTIES OF DEEP-RED TOP-SURFACE-EMITTING LASERS
No full textBy studying thermal behavior of all-MBE surface-emitting lasers, barrier heights and optimum cavity design parameters are obtained. The barrier heights for holes between hetero-interfaces of Al0.3Ga0.7As-Al0.65Ga0.35As and AlAsAl0.65Ga0.35As (DELTAx = 0.35) are measured to be 77 meV at zero bias for the deep-red top-surface-emitting laser. The barrier height decreases linearly with forward bias voltage, explaining the nonlinearity in current-voltage characteristics of the top-surface-emitting laser. The contribution of electrons to electrical resistance is estimated to be negligibly small compared to that of holes for the structure consisting of DELTAx = 0.35. Minimum threshold current and maximum differential quantum efficiency observed around 200 K indicates slight mismatch between gain maximum and Fabry-Perot resonance for the deep-red top-surface-emitting laser
Solubilities of carbon dioxide in the aqueous potassium carbonate and potassium carbonate-poly(ethylene glycol) solutions
No full textThe solubilities of carbon dioxide in the aqueous potassium carbonate (K2CO3) solutions and potassium carbonate-poly(ethylene glycol) (PEG) solutions were measured at 298.2 and 323.2 K with a CO2 partial pressure range of 5 kPa to 2 MPa. The concentrations of the aqueous mixtures by mass were 5% K2CO3, 5% K2CO3-15% PEG, 5% K2CO3-30% PEG, 10% K2CO3 and 10% K2CO3-15% PEG. The experimental solubility results were presented by the mole ratio of CO2 and K2CO3 contained in the liquid mixture. The addition of PEG to 5 mass% K2CO3 solution rather lowered the solubility of CO2 at a constant temperature and pressure within the CO2 partial pressure range of 5 kPa to 2 MPa. The loadings of CO2 decreased with increasing temperature from 298.2 to 323.2 K. (C) 1997 Elsevier Science B.V
PiLa-CS Professional Learning Community - Workshop 2 Resources
No full textDuring the Summer of 2021 and 2022, the Participating in Literacies and Computer Science (PiLa-CS) Research Practice Partnership convened and supported a community of practice to learn more about how to enable better CS teaching for emergent bilinguals. These are materials from Workshop 2 of the PLC.Sponsored by the National Science Foundation under NSF grant CNS-1738645 and DRL-1837446. Any opinions, findings, and conclusions or recommendations expressed in this material are those of the author(s) and do not necessarily reflect the views of the National Science Foundation
Translanguaging Pedagogy in CS Ed
No full textEpisode 3: Translanguaging pedagogy in CS Education
This video looks at how multilingual students already use translanguaging in their computer science classes and discusses how CS educators can further support them with translanguaging pedagogy, a framework that prompts teachers to consider their stance, design, and shifts.
Featuring team members from Participating in Literacies and Computer Science (PiLa-CS), https://www.pila-cs.orgEpisode 3: Translanguaging pedagogy in CS Education
This video looks at how multilingual students already use translanguaging in their computer science classes and discusses how CS educators can further support them with translanguaging pedagogy, a framework that prompts teachers to consider their stance, design, and shifts.
Featuring team members from Participating in Literacies and Computer Science (PiLa-CS), https://www.pila-cs.orgSponsored by the National Science Foundation under NSF grant CNS-1738645 and DRL-1837446. Any opinions, findings, and conclusions or recommendations expressed in this material are those of the author(s) and do not necessarily reflect the views of the National Science Foundation
EP-based joint active user detection and channel estimation for massive machine-type communications
No full textMassive machine-type communication (mMTC) is a newly introduced service category in 5G wireless communication systems to support a variety of Internet-of-Things (IoT) applications. In recovering sparsely represented multi-user vectors, compressed sensing-based multi-user detection (CS-MUD) can be used. CS-MUD is a feasible solution to the grant-free uplink non-orthogonal multiple access (NOMA) environments. In CS-MUD, active user detection (AUD) and channel estimation (CE) should be performed before data detection. In this paper, we propose the expectation propagation-based joint AUD and CE (EP-AUD/CE) technique for mMTC networks. The EP algorithm is a Bayesian framework that approximates a computationally intractable probability distribution to an easily tractable distribution. The proposed technique finds a close approximation of the posterior distribution of the sparse channel vector. Using the approximate distribution, AUD and CE are jointly performed. We show by numerical simulations that the proposed technique substantially enhances AUD and CE performances over competing algorithms.N
PiLa-CS Professional Learning Community - Design Journal Template
No full textDuring the Summer of 2021 and 2022, the Participating in Literacies and Computer Science (PiLa-CS) Research Practice Partnership convened and supported a community of practice to learn more about how to enable better CS teaching for emergent bilinguals. These are materials from from the PLC for a Design Journal to act as a planing template for teachers.Sponsored by the National Science Foundation under NSF grant CNS-1738645 and DRL-1837446. Any opinions, findings, and conclusions or recommendations expressed in this material are those of the author(s) and do not necessarily reflect the views of the National Science Foundation
Size-controlled electrochemical synthesis of palladium nanoparticles using morpholinium ionic liquid
No full textWe have successfully synthesized morpholinium ionic liquid-stabilized palladium (Pd) nanoparticles by electrochemical reduction. For characterization of Pd nanoparticles, FT-IR, UV-visible spectroscopy, and Transmission electron microscopy (TEM) were employed. The FT-IR spectrum of Pd nanoparticles indicated the surface binding of the IL to the nanoparticles. The UV-visible spectrum showed that nano-sized I'd particles were produced. The particle size was controlled by the adjustment of the current density, temperature, and electrolysis duration. The TEM images showed an average size of 2.0, 2.2, 2.4, 2.9, 3.5, 3.9, and 4.5 nm. Nearly a 0.5 run-sized control of the nanoparticle was achieved. The particle size increased with a decrease in the current density and an increase in temperature and electrolysis duration. The electron diffraction patterns of resulting nanoparticles indicated that the particles had a crystalline structure.This work was supported by Grant No. R01-2003-000-10300-0
from the Basic Research Program of the Korea Science & Engineering
Foundation and also partially funded by the Brain Korea
21 Project. We are grateful to KBSI (Korea Basic Science Institute)
for assistance with NMR, FAB mass, and ion chromatograph
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