BEGIN:VCALENDAR
VERSION:2.0
PRODID:-//CMSA - ECPv6.17.1//NONSGML v1.0//EN
CALSCALE:GREGORIAN
METHOD:PUBLISH
X-WR-CALNAME:CMSA
X-ORIGINAL-URL:https://cmsa.fas.harvard.edu
X-WR-CALDESC:Events for CMSA
REFRESH-INTERVAL;VALUE=DURATION:PT1H
X-Robots-Tag:noindex
X-PUBLISHED-TTL:PT1H
BEGIN:VTIMEZONE
TZID:America/New_York
BEGIN:DAYLIGHT
TZOFFSETFROM:-0500
TZOFFSETTO:-0400
TZNAME:EDT
DTSTART:20230312T070000
END:DAYLIGHT
BEGIN:STANDARD
TZOFFSETFROM:-0400
TZOFFSETTO:-0500
TZNAME:EST
DTSTART:20231105T060000
END:STANDARD
BEGIN:DAYLIGHT
TZOFFSETFROM:-0500
TZOFFSETTO:-0400
TZNAME:EDT
DTSTART:20240310T070000
END:DAYLIGHT
BEGIN:STANDARD
TZOFFSETFROM:-0400
TZOFFSETTO:-0500
TZNAME:EST
DTSTART:20241103T060000
END:STANDARD
BEGIN:DAYLIGHT
TZOFFSETFROM:-0500
TZOFFSETTO:-0400
TZNAME:EDT
DTSTART:20250309T070000
END:DAYLIGHT
BEGIN:STANDARD
TZOFFSETFROM:-0400
TZOFFSETTO:-0500
TZNAME:EST
DTSTART:20251102T060000
END:STANDARD
END:VTIMEZONE
BEGIN:VEVENT
DTSTART;TZID=America/New_York:20240321T130000
DTEND;TZID=America/New_York:20240321T140000
DTSTAMP:20240318T140916Z
CREATED:20240314T184932Z
LAST-MODIFIED:20240318T140916Z
UID:10002912-1711026000-1711029600@cmsa.fas.harvard.edu
SUMMARY:Decoding The Origins of Fluidity in Multicellular Systems
DESCRIPTION:Active Matter Seminar \nSpeaker: Max Bi (Northeastern University) \nTitle: Decoding The Origins of Fluidity in Multicellular Systems \nAbstract: Organisms continually adapt to mechanical forces at the cellular and tissue levels\, a process crucial for sustaining vital life functions. In pivotal physiological processes\, such as cancer progression and embryonic development\, tissues are often poised near solid-like and fluid-like states. My talk will delve into three critical aspects of this phenomenon: (1) utilizing computational models that draw parallels with soft matter physics\, we examine shear-induced rigidity and the origins of fluidity in epithelial tissues; (2) exploring the intricate relationship between external mechanical stresses and internal cellular dynamics\, unraveling a range of rheological behaviors\, such as shear thinning and thickening\, which are key for understanding rheological responses in varying physical contexts; and (3) investigating how cellular processes like division and apoptosis influence tissue states\, with a specific focus on the emergence of hexatic phases\, an intermediate state exhibiting properties of both solids and liquids.
URL:https://cmsa.fas.harvard.edu/event/activematter-32124/
LOCATION:CMSA Room G10\, CMSA\, 20 Garden Street\, Cambridge\, MA\, 02138\, United States
CATEGORIES:Active Matter Seminar
ATTACH;FMTTYPE=image/png:https://cmsa.fas.harvard.edu/media/CMSA-Active-Matter-Seminar-03.21.2024.png
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/New_York:20240404T130000
DTEND;TZID=America/New_York:20240404T140000
DTSTAMP:20240401T210220Z
CREATED:20240328T161543Z
LAST-MODIFIED:20240401T210220Z
UID:10003353-1712235600-1712239200@cmsa.fas.harvard.edu
SUMMARY:Shape morphing with swelling hydrogels and expanding foams
DESCRIPTION:Active Matter Seminar \nSpeaker: Abby Plummer\, Boston University \nTitle: Shape morphing with swelling hydrogels and expanding foams \nAbstract: Materials that increase in size offer intriguing possibilities for shape-morphing applications. Here\, we explore two such systems—swelling polyacrylamide hydrogels and expanding polyurethane foams. The hydrogels swell by absorbing water into crosslinked polymer networks. They can therefore be modeled by coupling solvent migration with the deformations of a hyperelastic solid. In contrast\, the foams initially behave as liquids with viscosity and volume increasing in time\, responding elastically only when close to solidification. We investigate how these expanding materials are sculpted by complex environments with obstacles and trenches.
URL:https://cmsa.fas.harvard.edu/event/active-matter-4424/
LOCATION:Hybrid – G10
CATEGORIES:Active Matter Seminar
ATTACH;FMTTYPE=image/png:https://cmsa.fas.harvard.edu/media/CMSA-Active-Matter-Seminar-04.04.2024.png
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/New_York:20240502T133000
DTEND;TZID=America/New_York:20240502T143000
DTSTAMP:20240430T131929Z
CREATED:20240416T181909Z
LAST-MODIFIED:20240430T131929Z
UID:10003376-1714656600-1714660200@cmsa.fas.harvard.edu
SUMMARY:Non-dispersive one-way signal amplification in sonic metamaterials
DESCRIPTION:Active Matter Seminar \nSpeaker: Jayson Paulose\, University of Oregon \nTitle: Control of parametric amplification in space-time modulated mechanical metamaterials \nAbstract: Active mechanical metamaterials harbor acoustic signal processing functionalities that are impossible to achieve in passive structures. Amplifying an elastic wave as it passes through the material is a prominent example\, with potential applications in acoustic signal processing and loss mitigation. The fundamental mechanism for signal amplification of this kind is the parametric amplifier–an oscillator whose stiffness is periodically modulated in time\, which can inject energy into mechanical oscillations. Typically\, parametric amplification occurs at distinct modulation frequencies that are trivially related to the resonance modes of the unmodulated system\, which restricts its utility for amplifying signals with complex spatial or spectral structure. In this talk\, I’ll show how spatial variation of the modulation phase in parametric oscillator networks enables amplification phenomena that are far richer than those achievable by uncoupled and uncoordinated parametric amplifiers. Examples include turning off parametric resonances for particular vibrational modes in small assemblies [1]\, and achieving nonreciprocal broadband amplification in periodic arrays [2]. The existence of parametric resonances is tied to the internal symmetries inherent to mechanical systems as well as the symmetries obeyed by the parametric variation in space and time\, through an exact theoretical framework that augments the standard Floquet analysis of space-time modulated systems. \n  \n[1] Melkani and Paulose\, arXiv:2310.08734 \n[2] Kruss and Paulose\, PRApplied17\, 024020 (2022)
URL:https://cmsa.fas.harvard.edu/event/active-matter-5224/
LOCATION:Jefferson 256\, 17 Oxford Street\, Cambridge\, MA\, 02138\, United States
CATEGORIES:Active Matter Seminar
ATTACH;FMTTYPE=image/png:https://cmsa.fas.harvard.edu/media/CMSA-Active-Matter-Seminar-05.02.2024-2.png
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/New_York:20240516T130000
DTEND;TZID=America/New_York:20240516T140000
DTSTAMP:20240510T175438Z
CREATED:20240416T181859Z
LAST-MODIFIED:20240510T175438Z
UID:10003377-1715864400-1715868000@cmsa.fas.harvard.edu
SUMMARY:Controlling chaotic advection in 2D active nematics
DESCRIPTION:Active Matter Seminar \nSpeaker: Kevin Mitchell\, University of California\, Merced \nTitle: Controlling chaotic advection in 2D active nematics \nAbstract: Recent years have seen a surge of interest in active materials\, in which energy injected at the microscale gives rise to mesoscale coherent motion. One prominent example is an active 2D “liquid crystal” composed of microtubules in the nematic phase. The activity is generated by molecular motors that consume ATP to generate local shearing between the microtubules. The resulting 2D fluid flow exhibits self-generated mesoscale chaotic dynamics with a characteristic folding and stretching pattern. We analyze this dynamics from the perspective of chaotic advection\, in which the fluid can be viewed as “stirred” by topological defects in the nematic order parameter. Typically\, these defects move in an irregular\, chaotic pattern. We explore conditions\, both theoretically and in experiments\, under which the topological defects can be coaxed to perform regular periodic motion\, thus bringing some degree of order to the chaos.
URL:https://cmsa.fas.harvard.edu/event/active-matter-51624/
LOCATION:CMSA Room G10\, CMSA\, 20 Garden Street\, Cambridge\, MA\, 02138\, United States
CATEGORIES:Active Matter Seminar
ATTACH;FMTTYPE=image/png:https://cmsa.fas.harvard.edu/media/CMSA-Active-Matter-Seminar-05.16.2024.docx-1.png
END:VEVENT
END:VCALENDAR