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Search indexed NASA NTRS and DOE OSTI research on propulsion, heat transfer, battery materials and energy systems. Follow report and document links to the original sources.
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Advances in electro-copolymerization of NIR emitting and electronically conducting block copolymers
Block copolymers comprising benzothiadiazole were successfully electro-copolymerized leading to (BTD-T 2 ) n (BTD-F 2 ) m , where n and m were varied in a perfectly controllable, well-defined manner.
Comparing and Contrasting Detectors: JWST NIR vs HST WFC3
In many ways, WFC3s IR channel is a good indicator for what to expect with JWST. There are some differences, most of which should be beneficial in JWST- JWSTs lower operating temperature will freeze out charge traps that would affect WFC3. Benefits should include lower dark current, lower persistence, and better reciprocity- JWSTs more recent HgCdTe process has lower defect density. The benefits are as described above- JWST uses better indium barriers. The benefits should include fewer RC type pixels. One area where more study might be beneficial is stability. The detector electronics play a significant role in determining how stable a detector system is(v.s. bias drifts and photometry). JWSTs SIDECARs are completely WFC3s Ball electronics- Studies comparing the bias and photometric stability of WFC3 and JWST might be useful to informing data acquisition and calibration strategies for JWST.
Measuring Aqueous Humor Glucose Across Physiological Levels: NIR Raman Spectroscopy, Multivariate Analysis, Artificial Neural Networks, and Bayesian Probabilities
We have elicited a reliable Raman spectral signature for glucose in rabbit aqueous humor across mammalian physiological ranges in a rabbit model stressed by recent myocardial infarction.
Large-Area Low-Cost Plasmonic Nanostructures in the NIR for Fano Resonant Sensing
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Piezo-Phototronic Effect on Selective Electron or Hole Transport through Depletion Region of Vis-NIR Broadband Photodiode
Silicon underpins nearly all microelectronics today and will continue to do so for some decades to come. However, for silicon photonics, the indirect band gap of silicon and lack of adjustability severely limit its use in applications such as broadband photodiodes. Here, a high-performance p-Si/n-ZnO broadband photodiode working in a wide wavelength range from visible to near-infrared light with high sensitivity, fast response, and good stability is reported. The absorption of near-infrared wavelength light is significantly enhanced due to the nanostructured/textured top surface. The general performance of the broadband photodiodes can be further improved by the piezo-phototronic effect. The enhancement of responsivity can reach a maximum of 78% to 442 nm illumination, the linearity and saturation limit to 1060 nm light are also significantly increased by applying external strains. The photodiode is illuminated with different wavelength lights to selectively choose the photogenerated charge carriers (either electrons or holes) passing through the depletion region, to investigate the piezo-phototronic effect on electron or hole transport separately for the first time. This is essential for studying the basic principles in order to develop a full understanding about piezotronics and it also enables the development of the better performance of optoelectronics.
Evanescent absorption based fluoride fiber sensing enhancement led by doped graphene’s thermo-optic dispersion in NIR
Evanescent wave absorption based fiber optic sensor with fluoride core, doped silica clad, amorphous silicon layer, and graphene monolayer is studied in near infrared for highly sensitive and precise recognition of melanoma in liver tissues. The findings reveal that by carefully tuning the graphene’s dispersive behavior through doping and operating at slightly increased temperature (above room temperature) can lead to significantly high sensitivity and fine resolution. An optimum combination ‘1550 nm wavelength, 0.6 eV chemical potential (of graphene), and 311.1 K temperature’ leads to 112.211 mW/RIU sensitivity and 8.91 × 10{sup −10} RIU resolution. An ultrathin silicon layer leads to better performance along with improved stability against possible oxidation and thermal issues. A detailed survey finds that the above performance (resolution, in particular) is largely superior than the fiber sensors based on different techniques. The proposed sensor can be amended accordingly for biomedical applications needing high precision of tissue/process monitoring.
Prediction of mixed hardwood lignin and carbohydrate content using ATR-FTIR and FT-NIR
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Non-targeted NIR spectroscopy and SIMCA classification for commercial milk powder authentication: A study using eleven potential adulterants
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Quantification of diffuse scattering in glass and polymers by parametric power law analysis of UV to NIR light
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Quantification of pharmaceutical compounds in wastewater samples by near infrared spectroscopy (NIR)
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