Atmospheric chamber study of oil shale fly ash particles from circulating fluidized bed and pulverized firing processes

Oil shale combustion fly ash collected to electric precipitators from pulverized firing (PF) and circulating fluidized bed combustion (CFB) processes was investigated in atmospheric chamber experiments. The aim of the work was to detect differences in the atmospheric behaviour of the fine particles from CFB and PF boilers of the Estonian Power Plant (PP), located close to Narva, Estonia. One series of experiments was performed in a dual outdoor Teflon film smog chamber (270 m3) at the University of North Carolina at Chapel Hill (USA) under normal weather conditions (temperature, humidity, sunlight). Parallel tests were carried out in an outdoor smog chamber (108 m3) at Tuulna, Harju County, Estonia, where the experiment was made under meteorological conditions similar to those at the location of the PP. The size distribution and number concentration of particles in the chamber were monitored during the experiment. The fractional distribution results demonstrate that the CFB aerosol in the chamber air had more fine particles than the PF aerosol. Approximately 2 h after injection the fly ash particles larger than 4 μm had settled out from both samples. The initial fly ash aerosol had a trimodal fractional distribution. Both PF and CFB fly ash formed stable aerosols 1–3 μm in diameter during the 6 h experiment and are therefore prone to long-range transport

The Grizzly, December 15, 1986

Letters: Appeal for Artists; Use Common Sense in Regard to Smoke Alarms; Abortion Issue Spawns Another Challenge • Weeding Out the Weak at Musser • After a Prosperous Decade as President, Richter Reflects on his Life at Ursinus • Wrestling Wraps Up Winter With Albright White-Washing • Swimmin\u27 Women get a Trimmin\u27 • Varsity Hoopsters Even Season • All-American Avenue: Football\u27s Odgers; Field Hockey\u27s Johnson; Volleyball\u27s Kraszewski • Gymnastics Team Scores High in Season Opener • Letters: Court Conditions Cause Day\u27s Resignation; Coaching Cited as B-ball\u27s Achilles Heel • Students Able to Create Their Own Courses by Way of College Scholars Program • Going From Bare Douglas Fir to Santa\u27s Showplace • Tumarkin Gives Personal View of his Aggressive Couple • Ursinus\u27 Oldest Symbol • Kutztown Edges Lady-Bears • Weisel Given Peace Prize for Reminding World of the Nazi Horrors • David Marx Tells of Life Under Apartheid • Cub & Key / Sororities\u27 Phonathons • Promoting International Education at Ursinushttps://digitalcommons.ursinus.edu/grizzlynews/1178/thumbnail.jp

The Grizzly, December 5, 1986

Alleluia! Alleluia!: French Presents Handel\u27s Messiah • New Modernistic Sculpture To Arrive • Preparing For the Aggressive Couple • Editorial: Drug Testing Wrap • Letters: Ronning Still Steamed; Challenge vs. Pro-Choice; Nagy Raises More Questions on Abortion; Conrad, Get Your Labyrinth!; Women\u27s Studies Holds Various Viewpoints; Women\u27s Studies Program Defined • Ursinus Art Showcase to Grow • Faculty Fat Farm • Love Me Do to Revolution : Pat Mancuso\u27s Seen it All • Mermen Immersed In Swim Season • Bears Open Strong With 114-52 Thrashing vs. Mount St. Vincent, but Then Slump • Freshman Hacker Anything but Choppy For Men Harriers • Seesaw Beginning for Lady Bears • Another Club Cornered: Circle K Serves Community • Landis Traces Course of Adventhttps://digitalcommons.ursinus.edu/grizzlynews/1177/thumbnail.jp

Opening options for material transfer.

UNLABELLED: The Open Material Transfer Agreement is a material-transfer agreement that enables broader sharing and use of biological materials by biotechnology practitioners working within the practical realities of technology transfer. SUPPLEMENTARY INFORMATION: The online version of this article (doi:10.1038/nbt.4263) contains supplementary material, which is available to authorized users

Association of the OPRM1 Variant rs1799971 (A118G) with Non-Specific Liability to Substance Dependence in a Collaborative de novo Meta-Analysis of European-Ancestry Cohorts

Peer reviewe

Organosulfates as Tracers for Secondary Organic Aerosol (SOA) Formation from 2-Methyl-3-Buten-2-ol (MBO) in the Atmosphere

2-Methyl-3-buten-2-ol (MBO) is an important biogenic volatile organic compound (BVOC) emitted by pine trees and a potential precursor of atmospheric secondary organic aerosol (SOA) in forested regions. In the present study, hydroxyl radical (OH)-initiated oxidation of MBO was examined in smog chambers under varied initial nitric oxide (NO) and aerosol acidity levels. Results indicate measurable SOA from MBO under low-NO conditions. Moreover, increasing aerosol acidity was found to enhance MBO SOA. Chemical characterization of laboratory-generated MBO SOA reveals that an organosulfate species (C5H12O6S, MW 200) formed and was substantially enhanced with elevated aerosol acidity. Ambient fine aerosol (PM2.5) samples collected from the BEARPEX campaign during 2007 and 2009, as well as from the BEACHON-RoMBAS campaign during 2011, were also analyzed. The MBO-derived organosulfate characterized from laboratory-generated aerosol was observed in PM2.5 collected from these campaigns, demonstrating that it is a molecular tracer for MBO-initiated SOA in the atmosphere. Furthermore, mass concentrations of the MBO-derived organosulfate are well correlated with MBO mixing ratio, temperature, and acidity in the field campaigns. Importantly, this compound accounted for an average of 0.25% and as high as 1% of the total organic aerosol mass during BEARPEX 2009. An epoxide intermediate generated under low-NO conditions is tentatively proposed to produce MBO SOA