Nicholls State University

About: Nicholls State University is a education organization based out in Thibodaux, Louisiana, United States. It is known for research contribution in the topics: Population & The Internet. The organization has 456 authors who have published 795 publications receiving 20031 citations.

Electrothermal Atomic Absorption Interference Studies Using a Wire Loop Atomizer

Abstract: A W-Re wire-loop atomizer has been used to study interference effects caused by diverse compounds in the ETAAS determination of Cu, Cd, Mg, and Be. Absorbance-time profiles of both the analyte and the diverse metal were studied. In most cases, overlap of the AA signal of the diverse metal with that of the analyte depressed the analyte's signal. The major mode of suppression appears to be the formation of analyte compounds, such as oxides or chlorides, in the vapor phase. Shifts in appearance temperature were also observed, especially in the case of Cd, which was the most volatile metal studied. The addition of sulfate increased the appearance temperature of Cu and decreased or eliminated the suppression caused by Na and K salts.

Saltmarsh plants, but not fertilizer, facilitate invertebrate recolonization after an oil spill

Abstract: Foundation species contribute to the recovery of animal communities from disturbance by engineering, by improving habitat quality, and by regulating food availability In a salt marsh impacted by the Deepwater Horizon oil spill, we tested the hypothesis that nutrient subsidies would enhance the positive effects of the foundation species Spartina alterniflora on the initial recolonization of benthic invertebrate communities (eg, copepods, annelids, nematodes) by augmenting food (ie, microalgae) availability After two months, plantings of S alterniflora significantly elevated the densities of the polychaete Capitella capitata, meiofauna-sized annelids, and total macroinfauna over unplanted plots After 7 months, the significant effect of plantings persisted for meiofauna-sized annelids, but not for C capitata and total macroinfauna Plantings had no effect on copepods (including Nannopus palustris, the dominant species), nematodes, or microalgal biomass for either month Nutrient additions did not influence any taxon, despite initial increases in benthic microalgal biomass after 2 months We hypothesize that the structural effects of plants were important to early colonization, possibly by facilitating larval settlement or ameliorating temperature and desiccation stress Our results emphasize the importance of re-establishing foundation species in oil-impacted sites to enhance recolonization of saltmarsh annelids, but suggest that recolonization is not promoted by the addition of nutrients

Sex‐role Behaviour and Leadership: An Empirical Investigation

Abstract: Female nursing supervisors and subordinate nurses in an American hospital were given questionnaires to see if there was a link between sex‐role behaviour and leadership style. It is concluded that a form of job stereotyping exists, since individuals in supervisory positions are perceived by others as being less feminine, simply because they hold that position.

Recent applications of flame atomic absorption spectrometry to environmental measurements

Abstract: Atomic absorption spectroscopy is very useful for the determination of a large number of elements, especially at trace levels. It is a widely used technique for analysis of a wide variety of sample matrices including biota, soils, and water. Atomic absorption spectroscopy is a very reputable technique that is inexpensive and delivers accurate results even in a complex matrix. This review focuses on the applications of flame atomic absorption spectroscopy to environmental measurements, and is mainly based on papers published from 1999–2002.

A source-location privacy protection strategy via pseudo normal distribution-based phantom routing in WSNs

Abstract: Toward resolving the source-location privacy protection issue in Wireless Sensor Networks (WSNs), a Pseudo Normal Distribution-based Phantom Routing (PNDBPR) protocol is proposed in this paper. The proposed protocol is composed of two critical phases: 1) adjusting the value of minimum-hops between a phantom node and its source, and varying the area of the phantom node distribution region at the network deployment stage; 2) generating a set of Gaussian-distributed random real numbers using the Pseudo Random Generator when the source node is transmitting data packets, and calculating the corresponding random walk hops. Theoretical analyses and simulation results show that PNDBPR can dramatically improve the diversity and the dynamicity of the phantom nodes distribution at the expense of a slight increase in communication overheads when compared with the existing PUSBRF (Source Location Privacy Preservation Protocol in Wireless Sensor Network Using Source Based Restricted Flooding) and HBDRW(A hop-based directed random walk) protocols.