The Optical Qualities of a Solution Made of Copper-doped Silver Sulfide Colloidal Nanoparticles

The researchers present new optical properties of Cu-doped Ag2S colloidal solution synthesized via a wet chemical method. They investigate the effects of doping on nanoparticle properties. TEM images reveal spherical samples with sizes ranging from 6 to 18 nm. Doped samples exhibit a redshift in absorption spectra compared to pure Ag2S. Additionally, Pl intensity decreases with increasing Cu concentration. Size estimation from absorption spectra aligns with TEM results, with slight variations. This study unveils the unique optical characteristics of Cu-doped Ag2S colloidal solution, shedding light on the impact of doping and providing valuable insights into nanoparticle behavior and synthesis techniques. Keywords: Metal (Cu); Doped- Ag2S; Optica; PhotoluminescenceDOI: 10.7176/CPER/65-04Publication date: November 30th 202

Latent consequences of early-life lead (Pb) exposure and the future: Addressing the Pb crisis

Background. The lead (Pb) exposure crisis in Flint, Michigan has passed from well-publicized event to a footnote, while its biological and social impact will linger for lifetimes. Interest in the “water crisis” has dropped to pre-event levels, which is neither appropriate nor safe. Flint’s exposure was severe, but it was not unique. Problematic Pb levels have also been found in schools and daycares in 42 states in the USA. The enormity of Pb exposure via municipal water systems requires multiple responses. Herein, we focus on addressing a possible answer to long-term sequelae of Pb exposure. We propose “4R’s” (remediation, renovation, reallocation, and research) against the Pb crisis that goes beyond a short-term fix. Remediation for affected individuals must continue to provide clean water and deal with both short and long-term effects of Pb exposure. Renovation of current water delivery systems, at both system-wide and individual site levels, is necessary. Reallocation of resources is needed to ensure these two responses occur and to get communities ready for potential sequelae of Pb exposure. Finally, properly focused research can track exposed individuals and illuminate latent (presumably epigenetic) results of Pb exposure and inform further resource reallocation. Conclusion. Motivation to act by not only the general public but also by scientific and medical leaders must be maintained beyond initial news cycle spikes and an annual follow-up story. Environmental impact of Pb contamination of drinking water goes beyond one exposure incident in an impoverished and forgotten Michigan city. Population effects must be addressed long-term and nationwide

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Feeling Welcome with No “Buts”: Chinese Student Engagement in Residence Life

College student personnel and administrators working in residence halls are expected to provide a positive learning environment where every student’s point of view is welcomed respectfully. Creating that learning community requires residence coordinators to understand the circumstances of all students providing the means of a safe engaging environment to all of them. College administrators have to come up with innovative techniques and strategies to accommodate and extend helping hands to these students. Social adjustment is tumultuous for first year international students especially for those living in residence halls. Yet, research focused specifically on international residents in this environment is lacking (Paltridge et al., 2010). A quantitative study conducted at a Midwestern, midsized private institution examined first year international students’ perception of racial climate, community, and diversity in residence halls and how their perception influences learning outcomes. A descriptive analysis of the data was conducted, and the results were compared to data collected from the American College and University Housing Satisfaction Survey to compare experiences between international and domestic students. With insights on international student perception, practitioners can tailor programming to engage them

Ornamental fish - prospects for culture

In 1978 work was initiated to culture the -blood clam Anadara granosa in the Bay. A 100 m2 area was selected, an elderly clam fisherman from the village was entrusted with the watch and ward. Wide publicity was given in the village to create awareness. In the evening, the site was fenced with dry palmyra leaves (to serve as pen enclosure). Nylon netting was not preferred due to possible poachin