2,774 research outputs found
Poly Pelletizer: Recycled Pet Pellets From Water Bottles
Plastic water bottles comprise a large amount of waste worldwide. The goal of the Poly Pelletizer project is to create a system that will turn water bottles into polyethylene terephthalate (PET) pellets compatible with extruders to produce 3-D printer lament, along with other recycling applications.The system promotes a sustainable solution to plastic pollution by giving manufactures, particularly in developing nations, the means to produce their own bulk materials using waste plastic. Shrinking industrial recycling processes to a workbench scale gives individuals the ability to convert excess bottles into seemingly limitless products. The system works by using a dual heating and pressure system to both evenly mix and melt the plastic before pushing the resin through a die. The Poly Pelletizer successfully created pellets using various mixtures of virgin PET and shredded water bottles
Optical Excitation of a Nanoparticle Cu/p-NiO Photocathode Improves Reaction Selectivity for COâ‚‚ Reduction in Aqueous Electrolytes
We report the light-induced modification of catalytic selectivity for photoelectrochemical COâ‚‚ reduction in aqueous media using copper (Cu) nanoparticles dispersed onto p-type nickel oxide (p-NiO) photocathodes. Optical excitation of Cu nanoparticles generates hot electrons available for driving COâ‚‚ reduction on the Cu surface, while charge separation is accomplished by hot-hole injection from the Cu nanoparticles into the underlying p-NiO support. Photoelectrochemical studies demonstrate that optical excitation of plasmonic Cu/p-NiO photocathodes imparts increased selectivity for COâ‚‚ reduction over hydrogen evolution in aqueous electrolytes. Specifically, we observed that plasmon-driven COâ‚‚ reduction increased the production of carbon monoxide and formate, while simultaneously reducing the evolution of hydrogen. Our results demonstrate an optical route toward steering the selectivity of artificial photosynthetic systems with plasmon-driven photocathodes for photoelectrochemical COâ‚‚ reduction in aqueous media
Radiation-Hardness of PIN/VCSEL Arrays for the ATLAS Pixel Detector
I report on irradiation tests of PIN/VCSEL candidates for the ATLAS Pixel Detector's optical data-link, conducted at CERN by OSU's ATLAS group in 2006-2008.No embarg
From Chaos to Clarity: Claim Normalization to Empower Fact-Checking
With the rise of social media, users are exposed to many misleading claims.
However, the pervasive noise inherent in these posts presents a challenge in
identifying precise and prominent claims that require verification. Extracting
the important claims from such posts is arduous and time-consuming, yet it is
an underexplored problem. Here, we aim to bridge this gap. We introduce a novel
task, Claim Normalization (aka ClaimNorm), which aims to decompose complex and
noisy social media posts into more straightforward and understandable forms,
termed normalized claims. We propose CACN, a pioneering approach that leverages
chain-of-thought and claim check-worthiness estimation, mimicking human
reasoning processes, to comprehend intricate claims. Moreover, we capitalize on
the in-context learning capabilities of large language models to provide
guidance and to improve claim normalization. To evaluate the effectiveness of
our proposed model, we meticulously compile a comprehensive real-world dataset,
CLAN, comprising more than 6k instances of social media posts alongside their
respective normalized claims. Our experiments demonstrate that CACN outperforms
several baselines across various evaluation measures. Finally, our rigorous
error analysis validates CACN's capabilities and pitfalls.Comment: Accepted at Findings EMNLP202
Laminate dielectric and foil characterization for signal integrity on printed circuit board
Accurate characterization of laminate dielectrics as substrates of printed circuit boards (PCB) over a wide frequency range (from tens megahertz to tens gigahertz) is important from a signal integrity (SI) point of view. Accurate knowledge of dielectric constants (DK) and dissipation factors (DF), or loss tangents, of laminate dielectrics, as well as loss in conductors, as functions of frequency over a wide frequency range, are needed to the designers of high-speed digital electronics.
An in situ wideband traveling-wave technique based on measuring S-parameters of the PCB test vehicles with auxiliary through-reflect-line (TRL) calibration patterns has been developed. This technique has been extensively applied to the material characterization of PCBs up to 20 GHz. However, extension of the frequency range of testing PCBs up to 50 GHz requires solving numerous problems, related to a new PCB test vehicle design and improvement of the material parameter extraction algorithms to take into account various subtle effects arising as frequencies increase to 50 GHz. Extending the frequency range in the new 50-GHz test vehicles leads to potentially increasing uncertainties compared to the 20-GHz test vehicles. Different sources of errors and uncertainties for extracting DK and DF values are analyzed for both the present 20-GHz and the new perspective 50-GHz test vehicles. The limitations for the design of test vehicles are also discussed.
An alternative technique for measuring dielectric parameters of PCB laminate dielectrics is using split-post dielectric resonator (SPDR). This narrowband technique is applied to measurements of thin dielectric plates at frequencies 10 GHz, 15 GHz, and 20 GHz --Abstract, page iii
Research Proposal for an Experiment to Search for the Decay {\mu} -> eee
We propose an experiment (Mu3e) to search for the lepton flavour violating
decay mu+ -> e+e-e+. We aim for an ultimate sensitivity of one in 10^16
mu-decays, four orders of magnitude better than previous searches. This
sensitivity is made possible by exploiting modern silicon pixel detectors
providing high spatial resolution and hodoscopes using scintillating fibres and
tiles providing precise timing information at high particle rates.Comment: Research proposal submitted to the Paul Scherrer Institute Research
Committee for Particle Physics at the Ring Cyclotron, 104 page
NFC Sensors Based on Energy Harvesting for IoT Applications
The availability of low-cost near-field communication (NFC) devices, the incorporation of NFC readers into most current mobile phones, and the inclusion of energy-harvesting (EH) capabilities in NFC chips make NFC a key technology for the development of green Internet of Things (IoT) applications. In this chapter, an overview of recent advances in the field of battery-less NFC sensors at 13.56Â MHz is provided, and a comparison to other short-range RFID technologies is given. After reviewing power transfer in NFC, recommendations for the practical design of NFC-based sensor tags and NFC readers are made. A list of commercial NFC integrated circuits with energy-harvesting capabilities is also provided. A survey of recent battery-less NFC sensors developed by the group including soil moisture, water content, pH, color, and implanted NFC sensors is done
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