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PE/PEO cocontinuous polymer blends with application in gas separation membranes

Abstract: 
<p>&nbsp;</p> <p><strong>PE/PEO Cocontinuous Polymer Blends With Application in Gas Separation Membranes</strong></p> <p>This project investigates the effect of reactive compatibilization, shear rate, and annealing time on the cocontinuous morphology of polyethylene (PE)/ polyethylene oxide (PEO) blends. The characterization of surfaces and cross-sections of bulk samples and pressed films is carried out through scanning electron microscopy (SEM) after solvent-extraction of the PEO phase. Laser scanning confocal microscopy (LSCM) is employed for acquiring 3D images of porous PE sheets. Porous PE sheets with 100 &micro;m thickness are used as substrates for gas separation membranes made from polymerized ionic liquids. The researchers then study the effect of pore size and wall functionality on the performance and properties of the membranes. An oil-immersed 60 X objective lens is used with LSCM to obtain a stack of optical micrographs. The 2D images have to be deconvolved, tresholded prior to the reconstruction of 3D images. MSI&#39;s&nbsp;<a href="https://www.msi.umn.edu/labs/bscl">BSCL</a> and <a href="https://www.msi.umn.edu/labs/sdvl">SDVL</a> offer image postprocessing software which is necessary to obtain rendered 3D geometry of the membrane structure. Once the 3D structure is generated, it can be meshed and the membrane performance under various conditions can be modeled using Comsol software, also available in the BSCL.</p>
Group name: 
daoutidi

MSI PIs Honored for Groundbreaking Research

Two MSI PIs from the Department of Computer Science and Engineering , Professor George Karypis and the late Professor John Riedl, will receive the 2016 Seoul Test of Time Award at the World Wide Web Conference in Montreal, Canada later this month. Professors Karypis and Riedl, along with Professor...

MSI PIs Named Distinguished McKnight University Professors

Three MSI Principal Investigators have been named Distinguished McKnight University Professors for 2016: William Arnold ( Civil, Environmental, and Geo- Engineering ), Sarah Hobbie ( Ecology, Evolution, and Behavior ), and George Karypis ( Computer Science and Engineering ). This award recognizes...

MSI PI Shashi Shekhar Recognized for Outstanding Research

Professor Shashi Shekhar , an MSI PI from the Department of Computer Science and Engineering , has been recognized by the Springer Publishing Company for his paper, “From GPS and virtual globes to spatial computing – 2020.” It was selected as one of the top articles published in 2015 that “address...

Monte Carlo Simulation of Radiation Transport for Medical Physics Research

Abstract: 
<h3 class="red">Monte Carlo Simulation of Radiation Transport for Medical Physics Research</h3><p>These researchers are developing a measurement apparatus to obtain detailed 3D spatial distributions of absorbed dose in the vicinity of small high Z metals. Monte Carlo simulations allow the study of how radiation interacts with matter and transport in a medium in realistic geometry. This project uses a free Monte Carlo particle simulation code, the EGS (Electron Gamma Shower) code system, to study the characteristics of photon and electron transport in water-equivalent media containing solid materials of high atomic numbers (Zs). The main goal of the Monte Carlo study is to validate the measurements by comparing the measured data with the Monte Carlo simulation results. This comparison study will provide a necessary confidence of the new measurement tool which can be used to study experimental setups with different geometries and materials for clinical applications. High-performance computing capability is needed for the proposed study for the following reasons. First, the spatial dimension being analyzed is in the range of 1 mm to 50 mm and the required special resolution of the dose calculation is 0.1 mm in 3D. Secondly, the high-Z metals easily attenuate radiation (or photons and electrons), so the number of particles transporting through the medium decreases rapidly, leading a situation very difficult to simulate accurately by a Monte Carlo method. These factors consequently demand higher computing power to achieve a reasonable precision of estimated radiation doses within a reasonable computing time.</p><p>Return to this PI&#39;s <a href="https://www.msi.umn.edu/pi/01cf0c9c83d1a148e5469fbe841559e7/10491">main page</a>.</p>
Group name: 
watanabe

Simulation Studies of Astrophysical Plasmas: Magnetohydrodynamics on Cosmic Scales

Abstract: 
<h3 class="red">Simulation Studies of Astrophysical Plasmas: Magnetohydrodynamics on Cosmic Scales</h3><p>This group&#39;s computational program at MSI centers on high fidelity fluid dynamics simulations that address current and fundamental astrophysical problems, especially those involving the physics of cosmic plasmas. Most of the group&#39;s simulations use magnetohydrodynamic (MHD) codes - including other important physics, such as self-gravity, radiative energy balance and cosmic ray transport - developed in this group. They are designed and tested to show exceptional single processor performance and near-ideal scaling in parallel computation on systems at least as large as Mesabi. Much of the group&#39;s effort the past couple of years has gone into code development, as they moved to build codes that can address some very large and challenging problems.</p><p>The group is working on three specific projects:&nbsp;</p><ul><li>High Resolution Cosmology Simulations: Carry out exploratory cluster formation simulations on Mesabi using the Jones group&#39;s new WOMBAT (hybrid OpenMP/MPI) code.</li><li>Simulations of Active Galaxy Jets in Galaxy Clusters: Perform ten one-billion zone simulations using WOMBAT in order to define the bounds of the associated parameter space.</li><li>Simulations of Cluster Radio Halos and Relics: F<span style="background-color: rgb(255, 255, 255);">ifteen planned simulations that will involve colliding galaxy clusters using around 20 million smoothed-particle hydrodynamics and dark matter particles.</span></li></ul><p>A <a href="https://www.msi.umn.edu/content/computational-astrophysics">Research Spotlight</a> about this work appeared on the MSI website in October 2014.</p><p>Return to this PI&rsquo;s <a href="https://www.msi.umn.edu/pi/tomwjones/15800">main page</a>.</p>
Group name: 
jonestw

Genomic Analysis of Inheritance in Maize

Abstract: 
<h3 class="red">Genomic Analysis of Inheritance in Maize</h3><p>The Springer lab uses genomic technologies such as high-throughput sequencing to study the molecular sources of phenotypic variation. Their research aims to understand how variation in gene expression levels or epigenetic modifications contributes to phenotypic differences in maize. The current focus of their research is performing DNA methylation profiling and expression profiling for a set of over 100 diverse maize lines in order to associate epigenetic changes with altered gene expression levels or phenotypes. MSI software and computer labs have been used to perform data analyses and visualization of complex datasets.</p><p>Return to this PI&rsquo;s <a href="https://www.msi.umn.edu/pi/461e45f40931333422e590ed25e45c6d/24900">main page</a>.</p>
Group name: 
springer

Minnesota Population Center Receives NIH Grant

Posted on November 22, 2013 The Minnesota Population Center (MPC) was recently awarded $3.2 million to fund a project that will expand the Center’s Integrated Public Use Microdata Series. The project will add data on more than 600 million US individuals, greatly expanding the scope of the database...

MSI PI Vipin Kumar Named Regents Professor

Vipin Kumar ( MSI Fellow ; Head, Computer Science and Engineering ) is among three University professors who have been named Regents Professors. They will be formally recognized by the Board of Regents in September 2105. Professor Kumar and his research group develop novel, high-performance data-...

Using the Sun to Clean the Environment

MSI PI Larry Wackett ( Biochemistry, Molecular Biology, and Biophysics ) recently published a paper in the Nature online journal Scientific Reports that discusses a method of using sunlight to fight clean up toxic waste. The method involves a group of bacteria that use sunlight and others that eat...

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