Physical Sciences and Mathematics Commons^™

Employment Proximity And Outcomes For Moving Toopportunity Families, Michael C. Lens, C. J. Gabbe

Environmental Studies and Sciences

The Moving to Opportunity for Fair Housing Demonstration (MTO) randomly assigned housing vouchers to public housing residents in an experimental test of the effect of neighborhood and location on household outcomes. In terms of adult employment outcomes, the 2 treatment groups did not significantly differ from the control group. We use MTO data to examine whether spatial proximity to jobs and job growth explains this lack of treatment effect. We first estimate differences in access to jobs and job growth for the 3 MTO groups. We then use 2-stage least squares models to test relationships between employment accessibility and 2 …

Peridynamic Modeling Of Ruptures In Biomembranes, Michael Taylor, Irep Gözen, Samir Patel, Aldo Jesorka, Katia Bertoldi

Mechanical Engineering

We simulate the formation of spontaneous ruptures in supported phospholipid double bilayer membranes, using peridynamic modeling. Experiments performed on spreading double bilayers typically show two distinct kinds of ruptures, floral and fractal, which form spontaneously in the distal (upper) bilayer at late stages of double bilayer formation on high energy substrates. It is, however, currently unresolved which factors govern the occurrence of either rupture type. Variations in the distance between the two bilayers, and the occurrence of interconnections (“pinning sites”) are suspected of contributing to the process. Our new simulations indicate that the pinned regions which form, presumably due to …

Santa Clara Magazine, Volume 57 Number 4, Fall 2016, Santa Clara University

Santa Clara Magazine

3 - MISSION MATTERS

4 - THE BEST RUGBY TEAM EVER. By Sam Scott '96.

6 - QUESTIONS

Takagi-Sugeno Fuzzy Model Based Discrete Time Model Predictive Control For A Hypersonic Re-Entry Vehicle, Ben Margolis

Applied Mathematics Master's Theses

In this thesis, we present a control algorithm for a hypersonic re-entry vehicle during a Martian aerocapture maneuver. The proposed algorithm utilizes a discrete-time model predictive control technique with a Takagi-Sugeno fuzzy model of the vehicle to control the re-entry vehicle along an arbitrary trajectory using bank angle modulation. Simulations using model parameters and initial conditions from a Martian aerocapture mission demonstrate the stability, performance, and robustness of the proposed controller.

Hidden Costs And Deadweight Losses: Bundled Parking Andresidential Rents In The Metropolitan United States, C. J. Gabbe, Gregory Pierce

Environmental Studies and Sciences

There is a major housing affordability crisis in many American metropolitan areas, particularly for renters. Minimum parking requirements in municipal zoning codes drive up the price of housing, and thus represent an important potential for reform for local policymakers. The relationship between parking and housing prices, however, remains poorly understood. We use national American Housing Survey data and hedonic regression techniques to investigate this relationship. We find that the cost of garage parking to renter households is approximately $1,700 per year, or an additional 17% of a housing unit’s rent. In addition to the magnitude of this transport cost burden …

Santa Clara Magazine, Volume 57 Number 3, Summer 2016, Santa Clara University

Santa Clara Magazine

26 - CAN’T THREAD A MOVING NEEDLE To tackle sexual assault on college campuses, a playwriting project comes to the screen. By Danae Stahlnecker ’15.

28 - MISSION CRITICAL When three students fell ill from meningitis-causing bacteria—which can be fatal—it meant the clock was ticking. And to get through this, it would take everybody’s help. By Harold Gutmann.

36 - “WHERE ARE THEY TAKING US?” A journal from the front lines of the Syrian refugee crisis in Greece. By Colleen Sinsky ’10.

40 - NO STRANGERS HERE Refugees, home, and work by Ameera Naguib ’16 from Jordan to Silicon Valley. …

Santa Clara Magazine, Volume 57 Number 2, Spring 2016, Santa Clara University

Santa Clara Magazine

20 - LET THERE BE LIGHT Frank Cepollina ’59—the NASA maverick who saved Hubble. By Robert Zimmerman.

28 - LIKE NO PLACE ON EARTH Talking with John A. Sobrato ’60 about building Silicon Valley—literally. By Michael S. Malone ’75, MBA ’77.

32 - DISRUPTION IN THE HOUSE Allison Kopf ’11 just won one of the premier startup competitions on the planet. She’s making the Google Analytics of greenhouses. By Ed Cohen.

34 - AN AMERICAN STORY A few words from the remarkable life of Francisco Jiménez ’66. By Steven Boyd Saum.

38 - DR. JEROME HE was a man of …

Polyhedral Painting With Group Averaging, Frank A. Farris, Ryan Tsao

Mathematics and Computer Science

The technique of group-averaging produces colorings of a sphere that have the symmetries of various polyhedra. The concepts are accessible at the undergraduate level, without being well-known in typical courses on algebra or geometry. The material makes an excellent discovery project, especially for students with some background in computer science; indeed, this is where the authors first worked through the material, as teacher and student, producing a previously unseen type of artistic image. The process uses a photograph as a palette, whose colors and textures appear in kaleidoscopic form on the surface of a sphere. We depict tetrahedral, octahedral, and …

Structure–Function Relationships Of Fullerene Esters In Polymer Solar Cells: Unexpected Structural Effects On Lifetime And Efficiency, Michael Tro, Alexis Sarabia, Kyle J. Bandaccari, David Oparko, Emma Lewis, Maxwell J. Giammona, Justin Isaac, Parisa Tajalli-Tehrani Valverde, Grace E. Chesmore, Thorsteinn Adalsteinsson, Richard P. Barber Jr., Brian J. Mcnelis

Physics

We report both transport measurements and spectroscopic data of polymer/fullerene blend photovoltaics using a small library of fullerene esters to correlate device properties with a range of functionality and structural diversity of the ester substituent. We observe that minor structural changes can lead to significant and surprising differences in device efficiency and lifetime. For example we have found that isomeric R-groups in the fullerene ester-based devices we have studied have dramatically different efficiencies. The characteristic lifetimes derived from both transport and spectroscopic measurements are generally comparable; however, some more rapid effects in specific fullerene esters are not observed spectroscopically. It …

Preconditioning And Uniform Convergence For Convection-Diffusion Problems Discretized On Shishkin-Type Meshes, Thái Ahn Nhan, Relja Vulanović

Mathematics and Computer Science

A one-dimensional linear convection-diffusion problem with a perturbation parameter multiplying the highest derivative is considered. The problem is solved numerically by using the standard upwind scheme on special layer-adapted meshes. It is proved that the numerical solution is -uniform accurate in the maximum norm. This is done by a new proof technique in which the discrete system is preconditioned in order to enable the use of the principle where “-uniform stability plus -uniform consistency implies -uniform convergence.” Without preconditioning, this principle cannot be applied to convection-diffusion problems because the consistency error is not uniform in . At the same time, …

Imaging The Oblique Propagation Of Electrons In Germanium Crystals At Low Temperature And Low Electric Field, R. A. Moffatt, Blas Cabrera, B. M. Corcoran, J. M. Kreikebaum, P. Redl, B. Shank, J. J. Yen, Betty A. Young, P. L. Brink, M. Cherry, A. Tomada, A. Phipps, B. Sadoulet, K. M. Sundqvist

Physics

Excited electrons in the conduction band of germanium collect into four energy minima, or valleys, in momentum space. These local minima have highly anisotropic mass tensors which cause the electrons to travel in directions which are oblique to an applied electric field at sub-Kelvin temperatures and low electric fields, in contrast to the more isotropic behavior of the holes. This experiment produces a full two-dimensional image of the oblique electron and hole propagation and the quantum transitions of electrons between valleys for electric fields oriented along the [0,0,1] direction. Charge carriers are excited with a focused laser pulse on one …

Turning On The Lights: Transcending Energy Poverty Through The Power Of Women Entrepreneurs, Leslie C. Gray, Alaina Boyle, Victoria Yu

Miller Center Fellowship

Solar lanterns offer affordable, high-quality lighting in developing countries. A number of organizations, including social enterprises, make solar lanterns available to rural households as an alternative to candles or kerosene lamps. One of the most successful of these organizations is Solar Sister.

Solar Sister, a social enterprise operating in Tanzania, Uganda, and Nigeria, is dedicated to eradicating energy poverty through the economic empowerment of women. In addition to economically empowering its women entrepreneurs, the business model of Solar Sister also cultivates sales networks built on trust in last-mile distribution methods.

While Solar Sister has previously conducted research regarding its many …