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DTSTART:20070311T020000
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BEGIN:VEVENT
DTSTAMP:20250207T123141
DTSTART;TZID=America/Detroit:20250123T160000
DTEND;TZID=America/Detroit:20250123T180000
SUMMARY:Careers / Jobs:Miami-Dade County Public Schools Connect Cafe\, January 23rd\, 2025
DESCRIPTION:Take your coffee break with our recruitment team via live chat to learn about our positions at Miami-Dade County Public Schools!Join us every 2nd &amp\; 4th Thursday of the month from 4-6pm! Be sure to register here:https://app.brazenconnect.com/a/miami_dade_county_public_schools/s/Xdbb3/0J86e
UID:130593-21866424@events.umich.edu
URL:https://events.umich.edu/event/130593
CLASS:PUBLIC
STATUS:CONFIRMED
CATEGORIES:
LOCATION:
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BEGIN:VEVENT
DTSTAMP:20250114T162353
DTSTART;TZID=America/Detroit:20250123T160000
SUMMARY:Workshop / Seminar:Reaction Networks of Criegee Intermediates Formed in the Ozonolysis of a Series of Acyclic and Endocyclic Alkenes: Influence of Carbon Chain Length and Reactive Environment
DESCRIPTION:The reaction networks that describe the intricate chemical processes involved in atmospheric and combustion systems are typically dominated by reactive intermediates that usually occur in low concentrations. The identification and quantification of these reactive species within complex reactive mixtures are crucial for developing a fundamental\, chemically accurate description of complex atmospheric and combustion systems. Criegee intermediates (CIs)\, carbonyl oxide reactive intermediates formed during the ozonolysis of unsaturated organic compounds\, possess the unique ability to add both carbon and oxygen mass to the co-reactant through either 1\,3-dipolar cycloaddition or insertion mechanisms. These mechanisms can lead to the production of high-molecular-weight\, low-volatility products\, which have been associated with the formation of secondary organic aerosols (SOA) in just a few reaction steps. Their unimolecular decomposition is recognized as a significant source of OH in the atmosphere.\nThe reaction networks of C1 to C7 CIs formed in the ozone-assisted oxidation reaction of a series of C3 to C7 acyclic and endocyclic alkenes were investigated in an atmospheric pressure jet-stirred reactor to elucidate the influence of CIs carbon number and reactive environment on the distribution of products and the formation of high-molecular-weight\, low-volatility compounds. Molecular beam high-resolution mass spectrometry\, tunable synchrotron single-photon ionization\, and ab initio threshold energy calculations were employed for the detection and identification of gas-phase reactive intermediates and final products. Temperature-dependent analysis employing DART ionization-Orbitrap mass spectrometry was utilized to facilitate the detection of high-molecular-weight\, low-volatility reaction products.\nThe ozone-assisted oxidation of acyclic C3 to C7 alkenes was observed to lead to complex CIs reaction networks that encompass both unimolecular and bimolecular reactions. For instance\, formaldehyde oxide CIs were predominantly observed in the ozone-assisted oxidation of 1-propene and 1-butene\, resulting in the formation of products corresponding to sequential CIs additions to co-products such as water\, alkenes\, aldehydes\, alcohols\, and carboxylic acids. However\, oligomerization did not appear to be favored by increasing the CIs carbon number. Notably\, no evidence for the formation of bimolecular products was observed in the case of long-chain CIs formed in the ozone-assisted oxidation of endocyclic alkenes\, specifically C5 to C7 alkenes. Instead\, long-chain CIs were observed to undergo unimolecular decomposition followed by autooxidation.\nThe outcomes of our research represent a significant advancement in understanding the CIs reactive behavior in complex reactive environments where multiple co-reactants are present. This information provides valuable insights for future kinetic modeling endeavors that can contribute to a more comprehensive understanding of the role and reactivity of CIs in the gas-phase to heterogeneous environments.
UID:125064-21854315@events.umich.edu
URL:https://events.umich.edu/event/125064
CLASS:PUBLIC
STATUS:CONFIRMED
CATEGORIES:Physical Chemistry,Chemistry
LOCATION:Chemistry Dow Lab - 1640
CONTACT:
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BEGIN:VEVENT
DTSTAMP:20250120T101207
DTSTART;TZID=America/Detroit:20250123T170000
DTEND;TZID=America/Detroit:20250123T193000
SUMMARY:Workshop / Seminar:January WISE Nights In
DESCRIPTION:Join WISE mentors and ambassadors for dinner from Jerusalem Garden and create your 2025 vision board! WISE Nights in are specifically designed to allow STEM students to meet other students in STEM\, foster connections\, and build their support network.
UID:130742-21866616@events.umich.edu
URL:https://events.umich.edu/event/130742
CLASS:PUBLIC
STATUS:CONFIRMED
CATEGORIES:Central Campus,Women In Stem,College Of Engineering,Graduate Students,Michigan Engineering,Sessions,The College Of Literature\, Science\, And The Arts,Transfer Students,Undergraduate Students,Women In Engineering,Women In Science,Women In Science And Engineering
LOCATION:WISE Office
CONTACT:
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