Curcumin/kaolin composite for advanced latent fingerprint imaging with fluorescence quantification.

Latent fingerprints (LFPs) are invisible impressions that need to be developed before being used for criminal investigation; however, existing fingerprint visualization techniques face challenges, such as complex preparation and poor contrast. To advance practical fingerprint detection, green-emissive micron-sized curcumin/kaolin composites were synthesized a facile and cost-effective one-step physical cross-linking method, which exhibited unprecedented performance in developing diversified marks, including LFPs, knuckle prints, palm prints, and footprints, with clear three-level details on various substrates. Notably, the powders successfully developed LFPs that were aged for 30 days and even up to 100 days, meeting the stringent requirements for comprehensive forensic application.

A novel light scattering method with size analysis and correction for on-line measurement of particulate matter concentration.

Based on the difference in particle size sensitivity between forward and backscattering during the measurement of particulate matter (PM) mass concentration using laser angular scattering, a method was proposed to improve its on-line measurement accuracy using three fixed detectors. Experimental and theoretical calculations indicate that the PM mass concentration sensitivity (PMCS) of the particles at the 22.5° detection angle and the asymmetry factor (I/I) are linearly related to the average particle size, and both decrease as the particle size increases.

A New Angular Light Scattering Measurement of Particulate Matter Mass Concentration for Homogeneous Spherical Particles.

Under the condition of ultra-low emission for power plants, the particulate matter concentration is significantly lower than that of typical power plants a decade ago, which posed new challenges for the particulate matter monitoring of stationary emission. The monitoring of particulate matter mass concentration based on ensemble light scattering has been found affected by particle size. Thus, this study develops a method of using the scattering angular distribution to obtain the real-time particle size, and then correct the particulate matter concentration with the real-time measured particle size.

Influences of In-Furnace Kaolin Addition on the Formation and Emission Characteristics of PM in a 1000 MW Coal-Fired Power Station.

The impacts of in-furnace kaolin addition on the formation and emission characteristics of PM from a 1000 MW coal-fired utility boiler equipped with electrostatic precipitators (ESPs) are investigated for the first time ever in this contribution. Detailed characterization of the chemical composition, micromorphology, melting characteristics of the fine PM, total fly ash, and/or bottom ash samples were carried out using the X-ray fluorescence probe, the field emission scanning electron microscope coupled with an energy dispersive X-ray detector, the ash fusion analyzer, and the dust specific resistivity analyzer. The results showed that the formation of fine PM was reduced when kaolin was added, and the mass concentrations of the particulate matter with the aerodynamic diameters of ≤0.