The ribbonlength problem aims to find the minimal ratio between the length of the core to the ribbon width over all the planar realisations in a knot or link type. We present a method for studying the ribbonlength problem for immersed planar ribbon knots and links. This is achieved by embedding the space of immersed planar ribbon knots and links...
Creator:
Ayala, José (University of Melbourne)
Created:
2019-06-27
Contributed By:
University of Minnesota, Institute for Mathematics and its Applications.
The sawtooth oscillation is an instability inside of a tokamak fusion reactor where the core temperature slowly rises followed by a sudden drop. A tokamak confines plasma with a magnetic field created inside a toroidal domain. The magnetic field defines a mapping from a cross-section of this domain to itself through following magnetic field line...
Creator:
Smiet, Chris (Princeton Plasma Physics Laboratory)
Created:
2019-06-27
Contributed By:
University of Minnesota, Institute for Mathematics and its Applications.
A small but significant portion of proteins contain knotting, but very little is known about how those proteins fold into their knotted native states. In this talk, we introduce a new theoretical folding pathway for knotted proteins that is based on recent computational and experimental evidence. By analyzing fingerprint data from the crystal st...
Creator:
Wong, Helen (Claremont McKenna College)
Created:
2019-06-26
Contributed By:
University of Minnesota, Institute for Mathematics and its Applications.
A n-sided polygon in 3-space can be described as a point in 3n-space by listing in order the coordinates of it vertices. In this way, the space of embedded n-sided polygons is a manifold in which points correspond to piecewise linear knots and paths correspond to isotopies which preserve the geometric structure of these knots. In this talk, we w...
Creator:
Hake, Kate (Carleton College)
Created:
2019-06-26
Contributed By:
University of Minnesota, Institute for Mathematics and its Applications.
Seifert fibered spaces are 3-dimensional manifolds with a 2-dimensional quotient space. Surfaces in Seifert fibered spaces fall into two categories: Compressible and incompressible. The structure of Seifert fibered spaces allows for a complete description of essential surfaces in Seifert fibered spaces in terms of a simplicial complex derived fr...
Creator:
Schultens, Jennifer (University of California, Davis)
Created:
2019-06-26
Contributed By:
University of Minnesota, Institute for Mathematics and its Applications.
Humans have been using weaving to construct baskets, mats, and other two and three-dimensional aspects of the built environment for at least 10,000 years; weaving remains attractive today as a fabrication technique thanks to its cost-effectiveness and the increasing capability of automated looms, with applications in architecture, art, chemical ...
Creator:
Vouga, Etienne (The University of Texas at Austin)
Created:
2019-06-26
Contributed By:
University of Minnesota, Institute for Mathematics and its Applications.
A method to construct M\"obius invariant weighted inner products on the tangent spaces of the knot space by using M\"obius invariant knot energies will be introduced. It gives M\"obius invariant gradients of such energies."
Creator:
O'Hara, Jun (Chiba University)
Created:
2019-06-25
Contributed By:
University of Minnesota, Institute for Mathematics and its Applications.
(Joint work with Philipp Reiter.) Aiming at optimizing the shape of closed embedded curves within prescribed isotopy classes, we use a gradient-based approach to approximate stationary points of the Möbius energy. The gradients are computed with respect to certain fractional-order Sobolev scalar products that are adapted to the Möbius energy. I...
Creator:
Schumacher, Henrik (RWTH Aachen University)
Created:
2019-06-25
Contributed By:
University of Minnesota, Institute for Mathematics and its Applications.
How nice are critical knots of knot energies? We already know that critical knots of the Möbius energy are smooth. This leads to the question whether critical knots of the Möbius energy are not only smooth, but also analytic. In this lecture, we give a short overview on the regularity results for the Möbius energy and present techniques with whi...
Creator:
Vorderobermeier, Nicole (Universität Salzburg)
Created:
2019-06-24
Contributed By:
University of Minnesota, Institute for Mathematics and its Applications.
In this talk we will see that topological entanglement and/or chain architecture alone can affect the mechanical properties of linear polymers. We use the Gauss linking integral as a measure of topological/geometrical complexity of linear chains and apply it to polymeric systems through Molecular Dynamics simulations. Our results show that the i...
Creator:
Panagiotou, Eleni (University of Tennessee)
Created:
2019-06-24
Contributed By:
University of Minnesota, Institute for Mathematics and its Applications.
DNA replication in bacteria yields two interlinked circular chromosomes. Returning the chromosomes to an unlinked monomeric state is essential to cell survival. Simplification of DNA topology is mediated by enzymes, such as recombinases and topoisomerases. We here focus on site-specific recombinases that recognize two short segments of DNA (the ...
Creator:
Vazquez, Mariel (University of California, Davis)
Created:
2019-06-24
Contributed By:
University of Minnesota, Institute for Mathematics and its Applications.
In this talk, we discuss the simplest model of a random graph embedding: the edge vectors are multivariate Gaussians conditioned on the topological constraints implied by the graph type. We will show that this model has a surprisingly rich and appealing theory, and allows for a variety of exact calculations for particular network types. This tal...
Creator:
Cantarella, Jason (University of Georgia)
Created:
2019-06-24
Contributed By:
University of Minnesota, Institute for Mathematics and its Applications.
Topics include: Recollection of history of mother Maria (Mykas) Wowk, including dekulakization/dispossession by Communists, surviving the Holodomor famine-genocide of 1932-33 in Ukraine, World War II and being a Displaced Person; growing up in the Ukrainian diaspora in the Twin Cities; intergenerational trauma.
Creator:
Riabokin, Tatiana
Contributor:
Gutmanis, Zina Poletz; Kurschner, Tracy; Ukrainian American Community Center
Created:
2019-06-22
Contributed By:
University of Minnesota Libraries, Immigration History Research Center Archives.
We apply the regularization via analytic continuation to generalized Riesz energies of submanifolds in Euclidean spaces to obtain Brylinski's beta function, which is a meromorphic function with simple poles. We study geometric information that can be derived from Brylinski's beta function.
Creator:
O'Hara, Jun (Chiba University)
Created:
2019-06-21
Contributed By:
University of Minnesota, Institute for Mathematics and its Applications.
The study of influence maximization in social networks has largely ignored disparate effects these algorithms might have on the individuals contained in the social network. Individuals may place a high value on receiving information, e.g. job openings or advertisements for loans. While well-connected individuals at the center of the network are ...
Creator:
Venkatasubramanian, Suresh (The University of Utah)
Created:
2019-06-21
Contributed By:
University of Minnesota, Institute for Mathematics and its Applications.
The stochastic block model is one of the oldest and most ubiquitous models for studying clustering and community detection. Here we revisit it from the perspective of semirandom models where we allow an adversary to make `helpful’ changes that strengthen ties within each community and break ties between them. We show a surprising result that the...
Creator:
Moitra, Ankur (Massachusetts Institute of Technology)
Created:
2019-06-21
Contributed By:
University of Minnesota, Institute for Mathematics and its Applications.
We present a general method for privacy-preserving Bayesian inference in Poisson factorization, a broad class of models that includes some of the most widely used models in the social sciences. Our method satisfies limited precision local privacy, a generalization of local differential privacy, which we introduce to formulate privacy guarantees ...
Creator:
Wu, Steven (University of Minnesota, Twin Cities)
Created:
2019-06-21
Contributed By:
University of Minnesota, Institute for Mathematics and its Applications.
Disulfide bonds arise from the oxidation of cysteine residues in proteins. One such bond in a protein creates a closed loop with free initial and terminal segments thereby forming a lasso structure. With two or more disulfide bonds, topologically complex graph structures are formed whose spatial situation can exhibit knotting and linking feature...
Creator:
Millett, Kenneth (University of California, Santa Barbara)
Created:
2019-06-21
Contributed By:
University of Minnesota, Institute for Mathematics and its Applications.
Seifert's algorithm provides a step-by-step procedure to produce a compact orientable surface whose boundary is a given knot. The surface obtained is not unique but its existence enables the construction of an infinite cyclic cover. The Kakimizu complex of a knot encodes Seifert surfaces. Not surprisingly, the infinite cyclic cover provides insi...
Creator:
Schultens, Jennifer (University of California, Davis)
Created:
2019-06-21
Contributed By:
University of Minnesota, Institute for Mathematics and its Applications.
We will see that Hadamard regularization and the regularization via analytic continuation give essentially the same information. This part is rather technical, although it will save complicated computation afterward.
Creator:
O'Hara, Jun (Chiba University)
Created:
2019-06-20
Contributed By:
University of Minnesota, Institute for Mathematics and its Applications.
The simplest and most widely applied method for guaranteeing differential privacy is to add instance-independent noise to a statistic of interest that is scaled to its global sensitivity. However, global sensitivity is a worst-case notion that is often too conservative for realized dataset instances. We provide methods for scaling noise in an in...
Creator:
Steinke, Thomas (IBM)
Created:
2019-06-20
Contributed By:
University of Minnesota, Institute for Mathematics and its Applications.
The sensitivity metric in differential privacy, which is informally defined as the largest marginal change in output between neighboring databases, is of substantial significance in determining the accuracy of private data analyses. Techniques for improving accuracy when the average sensitivity is much smaller than the worst-case sensitivity hav...
Creator:
Cummings, Rachel (Georgia Institute of Technology)
Created:
2019-06-20
Contributed By:
University of Minnesota, Institute for Mathematics and its Applications.
In this talk, we investigate statistical learning in the context of local privacy models, where data must be privatized before collection. We study the fundamental tradeoffs between statistical utility and privacy by providing sharp instance-specific bounds for private estimation through development of the local minimax risk. In contrast to the ...
Creator:
Ruan, Feng (Stanford University)
Created:
2019-06-20
Contributed By:
University of Minnesota, Institute for Mathematics and its Applications.
We present novel differentially private algorithms for estimation and hypothesis testing of data from a high-dimensional Gaussian. In contrast to most previous differentially private algorithms for high-dimensional data, the performance of our algorithms nearly matches that of the optimal non-private algorithms for many parameter regimes. That i...
Creator:
Ullman, Jonathan (Northeastern University)
Created:
2019-06-20
Contributed By:
University of Minnesota, Institute for Mathematics and its Applications.
Surfaces appear naturally in low dimensional topology and its applications. They can be described in several different ways, each with advantages and disadvantages. A complete classification can be given. Several structures, including geometric structures and curve complexes provide information on surfaces and higher dimensional manifolds.
Creator:
Schultens, Jennifer (University of California, Davis)
Created:
2019-06-20
Contributed By:
University of Minnesota, Institute for Mathematics and its Applications.
The field of fairness in machine learning has yet to settle on definitions. At a high level, there are (at least) two approaches: individual, and statistical definitions of fairness. Statistical definitions of fairness ask that some statistic of the classifier (like error rate or false positive rate) be equalized across some set of groups. While...
Creator:
Roth, Aaron (University of Pennsylvania)
Created:
2019-06-20
Contributed By:
University of Minnesota, Institute for Mathematics and its Applications.
A prominent concern, in the age of machine learning and data analysis, is that left to their own devices, algorithms will propagate - even amplify - existing biases. Common definitions of fairness are group-based, typically requiring that a given statistic be equal across a few demographic groups, socially identified as deserving protection. Suc...
Creator:
Reingold, Omer (Stanford University)
Created:
2019-06-19
Contributed By:
University of Minnesota, Institute for Mathematics and its Applications.
Topics include: Memories of surviving the Holodomor as a child; schooling during collectivization; experience as an Ost Arbeiter in Durlach, Germany; post-war chaos and life in Displaced Person camp; sponsorship to U.S. after World War II for Displaced Persons; building a life in Minnesota as a new immigrant in the 1950s; founding a church; part...
Creator:
Kovalevsky, Olga
Contributor:
Bahmet, Wanda; Gutmanis, Zina Poletz; Kurschner, Tracy; Shevchenko, Yulia; Ukrainian-American Community Center
Created:
2019-06-19
Contributed By:
University of Minnesota Libraries, Immigration History Research Center Archives.
Proteins are large macromolecules constituted by chains of amino acid residues to accomplish many biological tasks required by living organisms: catalyzing reactions, DNA replication and repair, and moving molecules around. Imagining how these protein molecules are formed (i.e. folded) into three-dimensional structures lead biologists to believe...
Creator:
Millett, Kenneth (University of California, Santa Barbara)
Created:
2019-06-19
Contributed By:
University of Minnesota, Institute for Mathematics and its Applications.
Hypothesis testing plays a central role in statistical inference, and is used in many settings where privacy concerns are paramount. In this talk we’ll address a basic question about privately testing simple hypotheses: given two distributions P and Q, and a privacy level ε, how many i.i.d. samples are needed to distinguish P from Q subject to ε...
Creator:
McMillan, Audra (University of California, Berkeley)
Created:
2019-06-19
Contributed By:
University of Minnesota, Institute for Mathematics and its Applications.
We begin with the generalization of electrostatic energy of charged knots, where we come across the difficulty of divergent integrals. Two kinds of regularization will be introduced, Hadamard regularization and the regularization via analytic continuation, both from the theory of generalized functions.
Creator:
O'Hara, Jun (Chiba University)
Created:
2019-06-18
Contributed By:
University of Minnesota, Institute for Mathematics and its Applications.
Fitting a model to a collection of observations is one of the quintessential questions in statistics. The standard assumption is that the data was generated by a model of a given type (e.g., a mixture model). This simplifying assumption is at best only approximately valid, as real datasets are typically exposed to some source of contamination. H...
Creator:
Diakonikolas, Ilias (University of Southern California)
Created:
2019-06-18
Contributed By:
University of Minnesota, Institute for Mathematics and its Applications.
Knots can be distinguished via invariants. Invariants measure different aspects of knottedness. Crossing number, bridge number, tunnel number and unknotting number provide distinct insights. Moreover, the behavior of these invariants under connected sum deserves closer scrutiny.
Creator:
Schultens, Jennifer (University of California, Davis)
Created:
2019-06-18
Contributed By:
University of Minnesota, Institute for Mathematics and its Applications.
A common goal in statistics and machine learning is to learn models that can perform well against distributional shifts, such as latent heterogeneous subpopulations, unknown covariate shifts, or unmodeled temporal effects. We develop and analyze a distributionally robust stochastic optimization (DRO) framework that learns a model that provides g...
Creator:
Duchi, John (Stanford University)
Created:
2019-06-18
Contributed By:
University of Minnesota, Institute for Mathematics and its Applications.
We consider the problem of estimating the common mean of univariate data, when independent samples are drawn from non-identical symmetric, unimodal distributions. This captures the setting where all samples are Gaussian with different unknown variances. We propose an estimator that adapts to the level of heterogeneity in the data, achieving near...
Creator:
Loh, Po-Ling (University of Wisconsin, Madison)
Created:
2019-06-18
Contributed By:
University of Minnesota, Institute for Mathematics and its Applications.
The replication of DNA requires the assistance of topology changing enzymes called topoisomerases. Efforts to discover the mechanisms by which various enzymes act on DNA has focused attention on questions for which geometrical and topological considerations provide insights as well as raising new questions. In this first lecture, we will explore...
Creator:
Millett, Kenneth (University of California, Santa Barbara)
Created:
2019-06-18
Contributed By:
University of Minnesota, Institute for Mathematics and its Applications.
We introduce the jackknife+, a novel method for constructing predictive confidence intervals that is robust to the distribution of the data. The jackknife+ modifies the well-known jackknife (leave-one-out cross-validation) to account for the variability in the fitted regression function when we subsample the training data. Assuming exchangeable ...
Creator:
Barber, Rina (University of Chicago)
Created:
2019-06-18
Contributed By:
University of Minnesota, Institute for Mathematics and its Applications.
We study the problem of robust subspace recovery (RSR) in the presence of adversarial outliers. That is, we seek a subspace that contains a large portion of a dataset when some fraction of the data points are arbitrarily corrupted. We first examine a theoretical estimator that is intractable to calculate and use it to derive information-theoreti...
Creator:
Maunu, Tyler (Massachusetts Institute of Technology)
Created:
2019-06-18
Contributed By:
University of Minnesota, Institute for Mathematics and its Applications.
This is an introduction to the lectures and the tutorials. We will study different topics, differential geometric topic using analysis for the lectures and topological topics with numerical experiments for the tutorials. A survey for the knot energies will also be given.
Creator:
O'Hara, Jun (Chiba University)
Created:
2019-06-17
Contributed By:
University of Minnesota, Institute for Mathematics and its Applications.
We present a geometrically exact equilibrium theory for elastic structures that have in common that they are effectively described by a 1D elastic theory (i.e., an ODE). Apart from the elastic rod this includes higher-dimensional structures such as thin sheets, strips and braids that deform subject to kinematic constraints that can be eliminated...
Creator:
van der Heijden, Gert (Imperial College London)
Created:
2019-06-17
Contributed By:
University of Minnesota, Institute for Mathematics and its Applications.
Knots provide a starting point for several branches of lowdimensional topology. Often, lowdimensional topologists are more interested in the complement of a knot than in the knot itself. Several types of invariants allow to distinguish between knots. In addition, a topological criterion for distinguishing different geometric types of knot comple...
Creator:
Schultens, Jennifer (University of California, Davis)
Created:
2019-06-17
Contributed By:
University of Minnesota, Institute for Mathematics and its Applications.
Topics include: Participation and leadership in Ukrainian-American community in Twin Cities; memories of their Holodomor survivor grandmother; learning about the Holodomor in school in Ukraine in the 1990s; 80th and 85th anniversary Holodomor commemorations; preservation of 1940s-era language and customs in Twin Cities diaspora.
Creator:
Khrystych, Oleksiy; Khrystych, Alla
Contributor:
Gutmanis, Zina Poletz; Kurschner, Tracy; Pidhayny, Taras; Ukrainian American Community Center
Created:
2019-06-11
Contributed By:
University of Minnesota Libraries, Immigration History Research Center Archives.
Local community organizer Shor Salkas sat down with us to talk about their work as a health equity planner at the Minnesota Department of Health, as well as their project centered around crowd-sourcing a vision for a new LGBTQ+ community space in the Bi Cities.
Contributor:
Salkas, Shor (Guest)
Created:
2019-06-10
Contributed By:
University of Minnesota Libraries, Jean-Nickolaus Tretter Collection in Gay, Lesbian, Bisexual and Transgender Studies.
David Hummels is the Dean and a Professor of Economics in the Krannert School of Management, and a Research Associate of the National Bureau of Economic Research. He joined Krannert in 2000 after serving on the faculty at the University of Chicago Booth School. His PhD in Economics is from the University of Michigan. Hummels is an award winning ...
Creator:
Hummels, David (Purdue University)
Created:
2019-06-07
Contributed By:
University of Minnesota, Institute for Mathematics and its Applications.
About the Speaker: Rebecca Nugent is the Associate Department Head and Director of Undergraduate Studies for Carnegie Mellon Statistics & Data Science. She works in clustering and classification methodology with an emphasis on high-dimensional, big data problems and record linkage applications. She was won several national and university teachin...
Creator:
Nugent, Rebecca (Carnegie Mellon University)
Created:
2019-06-06
Contributed By:
University of Minnesota, Institute for Mathematics and its Applications.
Juan C. Meza, Ph.D., is currently serving as the Division Director at the National Science Foundation’s Division of Mathematical Sciences. Prior to this position, he served as Dean of the School of Natural Sciences at the University of California, Merced. Juan also holds a position as Professor of Applied Mathematics, where his current research ...
Creator:
Meza, Juan (National Science Foundation)
Created:
2019-06-06
Contributed By:
University of Minnesota, Institute for Mathematics and its Applications.
Abdullah Lami immigrated to the United States from Iraq along with his family to attain a better education. While life was initially challenging as he missed his culture, learned a new language, and faced racial discrimination, life eventually became easier.
Creator:
Lami, Abdullah
Created:
2019-06-05
Contributed By:
University of Minnesota, Immigration History Research Center
Conference co-chair Colleen Waldie joined BiCities! to talk about the upcoming BECAUSE Conference on bisexuality. She shared with us some exciting features attendees can expect to see at this year's conference, ways to register and volunteer, and some history of the conference, as well as how it fits into the broader context of other conferences...
Contributor:
Waldie, Collenen (Guest)
Created:
2019-06-03
Contributed By:
University of Minnesota Libraries, Jean-Nickolaus Tretter Collection in Gay, Lesbian, Bisexual and Transgender Studies.
Nguyen came to the United States from Vietnam to finish his schooling. He has found many friends and experiences in the US, but still misses his friends and family back home.
Creator:
Vo, Nguyen
Created:
2019-05-31
Contributed By:
University of Minnesota, Immigration History Research Center
This story is about how the parents of Jesus Balderrama immigrated from Mexico in order to give their children better opportunities. Balderrama recounts the struggles of growing up in poverty and of being an intermediary between his parents and the English-speaking world around them.
Creator:
Balderrama, Jesus
Created:
2019-05-30
Contributed By:
University of Minnesota, Immigration History Research Center
Topics include: Survivor accounts of Holodomor famine-genocide of 1932-33 in Ukraine; local 50th and 80th anniversary commemorations; Harvest of Despair; post-WWII Ukrainian diaspora.
Creator:
Poletz, Alexander
Contributor:
Gutmanis, Zina Poletz; Kurschner, Tracy; Zielyk, Marta; Ukrainian American Community Center
Created:
2019-05-21; 2019-07-09
Contributed By:
University of Minnesota Libraries, Immigration History Research Center Archives.
Topics include: Reflection on the experiences of his grandmother, a Holodomor survivor and Ost Arbeiter during World War II; coping mechanisms and the importance of storytelling for processing traumatic and negative experiences; learning about the Holodomor from books in the 1980’s; 82nd anniversary commemoration; Soviet persecution of Ukrainian...
Creator:
Iwaskewycz, Stefan
Contributor:
Gutmanis, Zina Poletz; Kurschner, Tracy; Ukrainian American Community Center
Created:
2019-05-21
Contributed By:
University of Minnesota Libraries, Immigration History Research Center Archives.
Deborah Bisazza was born in Italy to wealthy parents. She met Anthony Allen, an American, while studying abroad in France. They lived together in Italy before moving to the United States, where they married and started a family.
Creator:
Allen, Marco
Created:
2019-05-15
Contributed By:
University of Minnesota, Immigration History Research Center
In 2011, Sue Wilson and Dean Johnson joined BiCities! to share their story of transforming Messiah Lutheran Church into a Reconciling in Christ congregation, which welcomes LGBTQ+ folks. Sue passed away in July of this year, and we are re-airing the 2011 episode in her memory.
Contributor:
Wilson, Sue (Guest); Johnson, Dean (Guest)
Created:
2019-05-13
Contributed By:
University of Minnesota Libraries, Jean-Nickolaus Tretter Collection in Gay, Lesbian, Bisexual and Transgender Studies.
Nazera Mohamed fled Ethiopia at a young age with her family to escape ethnic persecution they suffered being Oromo. They spent four years in Kenya before they were cleared to move to South Dakota, and then Minnesota. Her migrant experience has influenced the rest of Nazera's life, motivating her to work all the harder.
Creator:
Mohamed, Nazera
Created:
2019-05-13
Contributed By:
University of Minnesota, Immigration History Research Center
Rafael Juarez Bibiano moved to the United States from Mexico at the age of 17. During his time in the US, he sought out freedom, both linguistic and physical, by traveling across the country and learning English and the cultures of each region. This taught him the importance of diversity and the confidence that comes of independent travel.
Creator:
Juarez Bibiano, Rafael
Created:
2019-05-11
Contributed By:
University of Minnesota, Immigration History Research Center
Duncan McNab was born in Scotland in 1837 and taken to Canada when he was eleven. His mother and brother died from smallpox on the voyage. He farmed in Canada before moving to the United States, serving in the Union Army, and starting a family on land which reminded him of home.
Creator:
Dunn, Molly
Created:
2019-05-09
Contributed By:
University of Minnesota, Immigration History Research Center
This is the story of Barry Sherbeck, who grew up traveling around the Middle East with his missionary parents. He frequently returned to the United States, including for his college education, but also explored South East Asia as part of his job, where he met his wife.
Creator:
Sherbeck, Dana
Created:
2019-05-06
Contributed By:
University of Minnesota, Immigration History Research Center
Sasha Sentinel and Minda Mae of the Disaburly Duo discuss their experiences as disabled and LGBTQ+ burlesque performers in the Twin Cities and their personal journeys that led them to the medium.
Contributor:
Sentinel, Sasha (Guest); Mae, Minda (Guest)
Created:
2019-05-06
Contributed By:
University of Minnesota Libraries, Jean-Nickolaus Tretter Collection in Gay, Lesbian, Bisexual and Transgender Studies.
In porous media, the motion of charges at the fluid/solid interfaces induces a coupling between seismic and electromagnetic waves. This phenomenon, known as the electro-kinetic effect is at the heart of electroseismic imaging, a technique used in oil prospection to image sedimentary layers of porous media. It combines the high sensitivity to mat...
Creator:
Bonnetier, Eric (Université Grenoble-Alpes)
Created:
2019-05-03
Contributed By:
University of Minnesota, Institute for Mathematics and its Applications.
We discuss a numerical approach an inverse problem strategy associated to the Boltzmann-Poisson system of equations for transport of electrons in the reconstruction of space inhomogeneities for the background function associated to total charges. The objective of the (ill-posed) inverse problem is to recover the shape of distributions of ions or...
Creator:
Gamba, Irene (The University of Texas at Austin)
Created:
2019-05-02
Contributed By:
University of Minnesota, Institute for Mathematics and its Applications.
We generate reduced order Galerkin models for inversion of problems in Schrodinger form given data in the spectral domain for one and two dimensional problems. We show that in one dimension, after tridiagonalization, the Galerkin system is precisely the same as the three point staggered finite di fference system on the corresponding spectrally m...
Creator:
Moskow, Shari (Drexel University)
Created:
2019-05-02
Contributed By:
University of Minnesota, Institute for Mathematics and its Applications.
This story is about the narrator's experience moving to the US from China to study and the culture clash she experienced This is especially the case with race, as the narrator, moving from a majority to a minority, considers what her race actually means to her and those around her.
Creator:
Hu, Shuiyi
Created:
2019-05-02
Contributed By:
University of Minnesota, Immigration History Research Center
This talk is concerned with the stability issue in determining absorption and diffusion coefficients in quantitative photoacoustic imaging. Assuming that the optical wave is generated by point sources in a region where the optical coefficients are known, we derive Hölder stability estimates of the inversion. These results show that the reconstr...
Creator:
Triki, Faouzi (Université Grenoble-Alpes)
Created:
2019-05-02
Contributed By:
University of Minnesota, Institute for Mathematics and its Applications.
Over the last two decades, nonlinear microscopy has created a renaissance in the brain imaging community. It has changed how we visualize neurons by providing high-resolution, non-invasive imaging capability deep within intact brain tissue. Nonlinear imaging will likely play an essential role in understanding how the brain works at the level of ...
Creator:
Xu, Chris (Cornell University)
Created:
2019-04-30
Contributed By:
University of Minnesota, Institute for Mathematics and its Applications.
PhotoAcoustic Tomography (PAT) has become established as a significant imaging modality allowing the qualitative imaging in 3D of absorbed optical energy in the visible and near-infrared range, with high resolution, by exploiting the conversion of optical to acoustic energy and the discontinuity preserving propagation of ultrasound under the ass...
Creator:
Arridge, Simon (University College London)
Created:
2019-04-29
Contributed By:
University of Minnesota, Institute for Mathematics and its Applications.
The acousto-optic effect is a phenomenon in which the presence of an acoustic wave changes the light transmission properties of an optical medium. Acousto-optic tomography (AOT) is a hybrid imaging method which takes advantage of this effect. The general idea is to modulate the optical properties of an optical medium by varying an acoustic wave,...
Creator:
Chung, Francis (University of Kentucky)
Created:
2019-04-29
Contributed By:
University of Minnesota, Institute for Mathematics and its Applications.
Elias Lenz confronts his own racial, cultural, and ethnic identity when he learns of a previously-unknown grandfather, who is Afro-Cuban. An interaction with some Latina classmates made him reevaluate how he is perceived by others and by himself.
Creator:
Lenz, Elias
Created:
2019-04-28
Contributed By:
University of Minnesota, Immigration History Research Center
This is about the unique migration experience of Dr. Gusain a university professor who grew up traveling around the world with her family because her father was a diplomat. She has incorporated the global perspective she got from this travel into her studies and teaching.
Creator:
Thomas, Audrey
Created:
2019-04-20
Contributed By:
University of Minnesota, Immigration History Research Center
Emanuel Rosetti fled Romania with the rest of his family after his father was disappeared by the government of Nicolae Ceausescu. After living in a Ukrainian refugee camp, his family joined relatives in Arizona, where Emanuel learned to fit in in his new community.
Creator:
Nelson, Griffin
Created:
2019-04-16
Contributed By:
University of Minnesota, Immigration History Research Center
BJ Metzger, a long-time local local LGBTQ+ activist, discusses high points, low points, and some of the most important moments in Twin Cities LGBTQ+ history.
Contributor:
Metzger, BJ (Guest)
Created:
2019-04-15
Contributed By:
University of Minnesota Libraries, Jean-Nickolaus Tretter Collection in Gay, Lesbian, Bisexual and Transgender Studies.
Local trans activist Ellie Krug discusses her company, Human Inspiration Works, LLC, where she offers trainings, coaching, and motivational speaking. She also talks about her book, Getting to Ellen, and her local radio show, Ellie 2.0.
Contributor:
Krug, Ellie (Guest)
Created:
2019-04-11
Contributed By:
University of Minnesota Libraries, Jean-Nickolaus Tretter Collection in Gay, Lesbian, Bisexual and Transgender Studies.
Dennis Wyatt and David Novak discuss their activism with MNPoly, a local polyamory organization, as well as the organization's upcoming conference, MNPolyCon.
Contributor:
Wyatt, Dennis (Guest); Novak, David (Guest)
Created:
2019-04-08
Contributed By:
University of Minnesota Libraries, Jean-Nickolaus Tretter Collection in Gay, Lesbian, Bisexual and Transgender Studies.
Sally Corbett, director of BiCities!, discusses their experience volunteering on the program as well as their work with the Bisexual Organizing Project (BOP).
Contributor:
Corbett, Sally (Guest)
Created:
2019-04-04
Contributed By:
University of Minnesota Libraries, Jean-Nickolaus Tretter Collection in Gay, Lesbian, Bisexual and Transgender Studies.
Photographs from University of Minnesota Duluth Theatre’s 2019 production of Sister Act. Run dates: April 18-28, 2019. Venue: Marshall Performing Arts Center Mainstage Theatre. Director: William Payne. Cast list--Deloris Van Cartier: Tolu Ekisola; Tina: Daysha Ramsey; Michelle: Mia Martinez; Mother Superior: Cally Stanich; Sister Mary Robert: Mi...
Creator:
Groehler, Brett
Created:
2019-04
Contributed By:
Archives and Special Collections, Kathryn A. Martin Library, University of Minnesota Duluth
I was late. I only decided to find a job in industry in the 4th year of my graduate study even though I never had a job outside of academia. The one question that I kept asking was: how do you get a job? It was scary because I did't know what to do. But I ended up getting a job. And today, I think I'm doing fine. If you are about to start on...
Creator:
Lee, Chang (Lowe's)
Created:
2019-03-29
Contributed By:
University of Minnesota, Institute for Mathematics and its Applications.
This is the story about the narrator's parents, who found love after coming from different backgrounds. The mother was a Moroccan Jew who had fled to Israel , and the father was a Polish Jew who had fled to the United States and met his wife on a trip to Israel. They moved to the United States and started a family, raising their children with el...
Creator:
Fine, Adam
Created:
2019-03-26
Contributed By:
University of Minnesota, Immigration History Research Center
Recommendation systems are used everywhere nowadays. This talk will discuss how differently recommendation systems are researched and applied in academia and industry, and challenges one might face or criteria one might care about when building recommendation systems. In real life, the job of a recommendation algorithm is not to be very predicti...
Created:
2019-03-25
Contributed By:
University of Minnesota, Institute for Mathematics and its Applications.
This is the story of an unintentional immigration. James Fleming was an Irish sailor on a boat taking immigrants to New Orleans. In 1863, Confederate troops seized his ship, stranding him in the United States without money and leaving his relatives thinking he had died. He was able to move to Arkansas and make a living in his new, unintentional ...
Creator:
Reinhold, Clara
Created:
2019-03-21
Contributed By:
University of Minnesota, Immigration History Research Center
Jose-Angel Lombera left Mexico at a young age to escape his impoverished conditions and seek new opportunities. The border crossing was harrowing and traumatic, and once in the States, he had to overcome a learning disability to learn English and adjust to the culture. He eventually became the head of a construction business and started a family.
Creator:
Lombera, Alejandra
Created:
2019-03-21
Contributed By:
University of Minnesota, Immigration History Research Center
