10,216 research outputs found
Continuous-wave and Transient Characteristics of Phosphorene Microwave Transistors
Few-layer phosphorene MOSFETs with 0.3-um-long gate and 15-nm-thick Al2O3
gate insulator was found to exhibit a forward-current cutoff frequency of 2 GHz
and a maximum oscillation frequency of 8 GHz after de-embedding for the
parasitic capacitance associated mainly with the relatively large probe pads.
The gate lag and drain lag of the transistor was found to be on the order of 1
us or less, which is consistent with the lack of hysteresis, carrier freeze-out
or persistent photoconductivity in DC characteristics. These results confirm
that the phosphorene MOSFET can be a viable microwave transistor for both
small-signal and large-signal applications.Comment: Accepted for oral presentation at IMS 201
Logic Against Bias: Textual Entailment Mitigates Stereotypical Sentence Reasoning
Due to their similarity-based learning objectives, pretrained sentence
encoders often internalize stereotypical assumptions that reflect the social
biases that exist within their training corpora. In this paper, we describe
several kinds of stereotypes concerning different communities that are present
in popular sentence representation models, including pretrained next sentence
prediction and contrastive sentence representation models. We compare such
models to textual entailment models that learn language logic for a variety of
downstream language understanding tasks. By comparing strong pretrained models
based on text similarity with textual entailment learning, we conclude that the
explicit logic learning with textual entailment can significantly reduce bias
and improve the recognition of social communities, without an explicit
de-biasing processComment: Accepted by EACL 202
Factors influencing matriculation of new undergraduate students: Do student type and gender matter?
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Identification of Cytotoxic Flavor Chemicals in Top-Selling Electronic Cigarette Refill Fluids.
We identified the most popular electronic cigarette (EC) refill fluids using an Internet survey and local and online sales information, quantified their flavor chemicals, and evaluated cytotoxicities of the fluids and flavor chemicals. "Berries/Fruits/Citrus" was the most popular EC refill fluid flavor category. Twenty popular EC refill fluids were purchased from local shops, and the ingredient flavor chemicals were identified and quantified by gas chromatography-mass spectrometry. Total flavor chemical concentrations ranged from 0.6 to 27.9 mg/ml, and in 95% of the fluids, total flavor concentration was greater than nicotine concentration. The 20 most popular refill fluids contained 99 quantifiable flavor chemicals; each refill fluid contained 22 to 47 flavor chemicals, most being esters. Some chemicals were found frequently, and several were present in most products. At a 1% concentration, 80% of the refill fluids were cytotoxic in the MTT assay. Six pure standards of the flavor chemicals found at the highest concentrations in the two most cytotoxic refill fluids were effective in the MTT assay, and ethyl maltol, which was in over 50% of the products, was the most cytotoxic. These data show that the cytotoxicity of some popular refill fluids can be attributed to their high concentrations of flavor chemicals
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