A fault-tolerant clock

Computers must operate correctly even though one or more of components have failed. Electronic clock has been designed to be insensitive to occurrence of faults; it is substantial advance over any known clock

Give Up, Catch Up, or Keep up with Innovation? An Educator\u27s Dilemma

Don\u27t look now, but your students want more than the three R\u27s for their school experience. Innovation, technology, entrepreneurship and the Maker Movement are changing what our students want to do and be in the future beyond what we can imagine today. Schools and teachers need to figure out how to respond to the DIY generation of makers emerging and be prepared to reshape education. In an information-rich age of smart phones, online learning, coding, gamification, apps, Internet of Things and digital badges, are today\u27s schools ready for tomorrow\u27s students

IMSA: Innovating STEM Education

The mission of IMSA, the world’s leading teaching and learning laboratory for imagination and inquiry, is to ignite and nurture creative, ethical, scientific minds that advance the human condition

Gray Eyes

https://digitalcommons.library.umaine.edu/mmb-vp/3959/thumbnail.jp

Master of Science

thesisThe High Altitude Ice Crystals - High Ice Water Content (HAIC-HIWC) field campaign produced aircraft retrievals of total condensed water content (TWC), hydrometeor particle size distributions, and vertical velocity (w) in high ice water content regions of tropical mesoscale convective systems (MCSs). These observations are used to evaluate deep convective updraft properties in high-resolution nested Weather Research and Forecasting (WRF) simulations of observed MCSs. Because simulated hydrometeor properties are highly sensitive to the parameterization of microphysics, three commonly used microphysical parameterizations are tested, including two bulk schemes (Thompson and Morrison) and one bin scheme (Fast Spectral Bin Microphysics). A commonly documented bias in cloud-resolving simulations is the exaggeration of simulated radar reflectivities aloft in tropical MCSs. This may result from overly strong convective updrafts that loft excessive condensate mass and from simplified approximations of hydrometeor size distributions, properties, species separation, and microphysical processes. The degree to which the reflectivity bias is a separate function of convective dynamics, condensate mass, and hydrometeor size has yet to be addressed. This research untangles these components by comparing simulated and observed relationships between w, TWC, and hydrometer size as a function of temperature. All microphysics schemes produce median mass diameters that are generally larger than observed for temperatures between -10 °C and -40 °C and TWC > 1 g m-3. Observations produce a prominent mode in the composite mass size distribution around 300 µm, but under most conditions, all schemes shift the distribution mode to larger sizes. Despite a much greater number of samples, all simulations fail to reproduce observed high TWC or high w conditions between -20 °C and -40 °C in which only a small fraction of condensate mass is found in relatively large particle sizes. Increasing model resolution and employing explicit cloud droplet nucleation decrease the size bias, but not nearly enough to reproduce observations. Because simulated particle sizes are too large across all schemes when controlling for temperature, w, and TWC, this bias is hypothesized to partly result from errors in parameterized microphysical processes in addition to overly simplified hydrometeor properties such as mass-size relationships and particle size distribution parameters

Polymer electrolyte conductivity and the Vogel equation.

The frequency-dependent conductivity of an amorphous polymer electrolyte is examined. It is shown that the frequency-dependent conductivity of polymer electrolytes exhibit many of the same properties as ion conducting glasses. This suggests similarities in the mechanism of ion conduction between polymer electrolytes and ionic glasses.The free volume theory of the Vogel equation is discussed. Some of the weaknesses of this theory as applied to polymer electrolytes are pointed out. A theory of the Vogel equation in terms of hopping models is presented. This theory is consistent with the results of the frequency-dependent conductivity and semi-crystalline polymer electrolytes.The conductivity of semi-crystalline polymer electrolyte systems are also investigated. This work demonstrates that at least two separate ion conduction mechanisms are occuring in semi-crystalline polymer electrolytes. A proposal is made for understanding the discontinuities seen in the conductivity of semi-crystalline polymer electrolytes.Polymer electrolytes are ion conducting solids with possible applications to rechargeable batteries. Despite great interest much remains unknown about the conductivity of polymer electrolytes. A number of topics concerned with polymer electrolyte conductivity are discussed in this work.An examination of conductivity prefactors revels the possible presence of the compensation effect. While great care must be taken before reporting a compensation effect, this work and the work of other researchers suggests that there is relation be tween the conductivity prefactors and the activation energy. Various theories of the compensation effect are discussed, and consistent with Linert's theory a connection is made between the compensation effect and the vibrational spectra of the polymer

Session B-5: Planning Your School\u27s New Innovation/Makerspace

Are you thinking about or moving forward with plans for your school to host a makerspace, entrepreneurship or innovation area? Take a tour of IN2, IMSA\u27s new 6,400 square food innovation center and makerspace and get tips from IMSA\u27s Chief Innovation Officer, who spent three years studying best practice, designing the center, hiring the staff, furnishing and launching programs. The session includes a 30 minute tour and 30 minutes of sharing lessons learned and answering questions from participants

Innovation and Entrepreneurship Boot Camp

“IN2” is a highly conceptual name that plays upon the idea of both innovation and inquiry – bridging businesses and the educational focus at IMSA. It also extends the current name assets at IMSA, metaphorically extending the mission. It is short, memorable and easy to say. It leaves room for curiosity and play without having to explain too much. The three lines composing the “2” represent the different journeys of students through time and the paths that come together at IMSA through innovative practices, inquisitive learning, and problem-solving processes

Mapping the Evolution of Optically-Generated Rotational Wavepackets in a Room Temperature Ensemble of D2_2

A coherent superposition of rotational states in D$_2$ has been excited by nonresonant ultrafast (12 femtosecond) intense (2 $\times$ 10$^{14}$ Wcm$^{-2}$) 800 nm laser pulses leading to impulsive dynamic alignment. Field-free evolution of this rotational wavepacket has been mapped to high temporal resolution by a time-delayed pulse, initiating rapid double ionization, which is highly sensitive to the angle of orientation of the molecular axis with respect to the polarization direction, $\theta$. The detailed fractional revivals of the neutral D$_2$ wavepacket as a function of $\theta$ and evolution time have been observed and modelled theoretically.Comment: 4 pages, 3 figures. Accepted for publication in Phys. Rev. A. Full reference to follow.