Undergraduate and graduate students presented posters in mathematics at the 2009 SACNAS National Conference.** Cory Colbert**, Virginia Commonwealth University, won an Undergraduate Poster Presentation award sponsored by DuPont, for "INVESTIGATION OF THE LOEWNER TRACE"; **Laura Strube**, University of Texas at Tyler, won an Undergraduate Poster Presentation award sponsored by DuPont, for "MINIMAL SURFACES IN FOUR DIMENSIONAL EUCLIDEAN SPACE"; **Andreea Erciulescu**, Colorado State University, won an Undergraduate Poster Presentation award sponsored by NSF Mathematical Sciences Institutes, for "SOLVING KAKURO PUZZLES;" and **Don Tadaya**, Arizona State University, won an Undergraduate Poster Presentation award sponsored by the Sandia National Laboratories, for "THE DYNAMICS OF A SPATIAL CYCLIC COMPETITIONS SYSTEM." The presentations were in the exhibit hall, where fellow students, mathematicians, judges, other scientists and exhibitors could view the posters. The AMS Public Awareness Office provided a packet of math resources and a gift to each presenter. See the list of the 2009 posters.

Math posters and presenters at the 2009 SACNAS conference (award winners in red):

Applied Mathematics:

- "INVESTIGATION OF THE LOEWNER TRACE,"
**Cory Colbert**, Virginia Commonwealth University. Corey was also a contestant and Grand Prize winner in the*Who Wants to Be a Mathematician*game. - "MINIMAL SURFACES IN FOUR DIMENSIONAL EUCLIDEAN SPACE,"
**Laura Strube**, University of Texas at Tyler - "SOLVING KAKURO PUZZLES,"
**Andreea Erciulescu**, Colorado State University - "THE DYNAMICS OF A SPATIAL CYCLIC COMPETITIONS SYSTEM,"
**Don Tadaya**, Arizona State University - "INFLUENZA VACCINATION SCHEDULING FOR INSTITUTIONAL LIVING ENVIRONMENTS: A COMPARTMENTAL MODELING APPROACH,"
**Peter S. Larson**, University of Michigan - COMPUTATIONAL ANALYSIS AND DESIGN OF A MICROFUIDIC MIXING CHAMBER FOR USE IN A BIOSENSOR,"
**Jonathan Custodio**, Tulane University - "IMPLEMENTING AND COMPARING LAMBERT SOLVERS FOR TRAJECTORY DESIGN STUDIES AND SPACE MISSION ANALYSES,"
**Paulina Rodriguez**, University of California, Santa Cruz and Institute for Pure and Applied Mathematics, UCLA - "MATHEMATICAL ANALYSIS OF THE FREQUENCY SPECTRUM OF A ONE-DIMENSIONAL PHOTONIC CRYSTAL,"
**Antonio Lopez**, University of Texas at Arlington - "ANALYSIS OF THE FREQUENCY SPECTRUM OF A TWO-LAYER PHOTONIC CRYSTAL,"
**Ezgihan Baydar**, University of Texas at Arlington - "VACCINATION STRATEGY AND OPTIMAL CONTROL FOR SEASONAL AND H1N1 INFLUENZA OUTBREAK,"
**Prosper Olivia**, University of Florida, Gainesville - "ANALYZING MESOAMERICAN LITHIC ARTIFACTS,"
**Cindy Enrique**, California State University Channel Islands - "MODELING PARTICULATE MATTER BY SMOOTHING SPLINES,"
**Maria Asencio**, Cornell University - "STUDY OF R-ORTHOGONALITY FOR LATIN SQUARES,"
**Richard Garcia**, University of Puerto Rico, Rio Piedras, San Juan - "MORE MONEY, MORE PROBLEMS: VARIATIONS ON THE COIN GAME PUZZLE,"
**Victoria Widowski**, California State University Monterey Bay - "PHYLOGENETIC INEQUALITIES,"
**Alexander Diaz**, Sam Houston State University - "'I'M SMART, BUT I JUST DON'T WANT TO PUT MYSELF OUT THERE': LATINO/A HIGH SCHOOL STUDENTS' PERSPECTIVES ON MATHEMATICS AND IDENTITY,"
**Maria Zavala**, University of Washington - "DEVELOPING RELATIVE INFECTIVITY PARAMETERS FOR A DYNAMICAL STUDY OF HOST-VIRUS INTERACTIONS IN CRENARCHAEAL SYSTEMS,"
**Meredith Berthelson**, University of Montana, Missoula - "INDECOMPOSABLE POLYHEDRA AND TORIC CODES,"
**Aileen Gaudinez**, Mathematical Sciences Research Institute Undergraduate Program - "AN INVESTIGATION OF THE RELATIONSHIP BETWEEN POPULATION ADIPOSITY AND CLIMATE CHANGE,"
**Charles Nguyen**, University of Texas at Arlington - "LIST DECODING ALGORITHMS FOR REED-SOLOMON CODES AND THEIR MAXIMUM DECODING RADII,"
**Kimberly Heu**, University of Hawaii at Manoa - "ALGEBRAIC STRUCTURE OF (GENERALIZED) TORIC CODES,"
**Ellen Le**, Pomona College - "A SYSTEMATIC CENSUS OF GENERALIZED TORIC CODES OVER GALOIS FIELDS OF SIZES 4, 5, AND 16,"
**Brian Vega**, California State Polytechnic University, Pomona - "CENSUS OF TWO DIMENSIONAL TORIC CODES OVER GALOIS FIELDS OF SIZES 7, 8 AND 9,"
**Abner Ortiz**, Mathematical Sciences Research Institute - "THE RELATIVE GAIN ARRAY OF CAYLEY GRAPHS,"
**Suzi Gearheart**, Sam Houston State University - "ON THE FEASIBILITY OF APPLYING REGRESSION ANALYSIS TO DERIVE EDAPHIC PROPERTIES FROM MEDITERRANEAN SOILS,"
**Lisette Milena Gaona Barrera**, Universidad Del Turabo, Gurabo, Puerto Rico - "MULTIVARIATE VANDERMONDE DETERMINANTS AND TORIC CODES,"
**Leyda Almodóvar**, University of Puerto Rico at Mayaguez, Leyda was also a contestant in the*Who Wants to Be a Mathematician*game. - "MATHEMATICAL MODELING OF BRANCHED CELL LINEAGE: EARLY STAGES OF TUMOR DEVELOPMENT,"
**Monica Villaron**, University of California, Santa Cruz - "DETERMINING ALLOWED AND FORBIDDEN FREQUENCIES FOR PHOTONIC CRYSTALS AND A NUMERICAL IMPLEMENTATION,"
**Ernesto Garcia**, University of Texas at Arlington - "KA-BAND ATMOSPHERIC CALIBRATION ANALYSIS,"
**Antonio Rodriguez**, National Aeronautics and Space Administration, Cleveland - "MODELING OF THE INTERACTIONS OF CRYPTOPHYTE ALGAE AND MYRIONECTA RUBRA,"
**Isaac Velando**, Texas A & M University - "EXPLORING DNA UNKNOTTING BY TYPE II TOPOISOMERASES: A STUDY OF WRITHE,"
**Juliet Portillo**, San Franicsco State University - "AN MSM GONORRHEA TRANMISSION MODEL WITH BEHAVIORAL EFFECTS,"
**Liana Medina-Rios**, Mount Holyoke College - "ASSIGNMENT PROBLEM: MATCHING TEACHER ASSISTANTS TO CLASSES,"
**Nancy Tafolla**, University of California, Davis - "COMBINATORIAL BIJECTIONS OF POWER SERIES WITHIN RINGS," Tori Pierce, University of Missouri, St. Louis and Cornell University
- "VON NEUMANN THEOREM AND ITERATIVE APPROXIMATIONS IN R
^{N},"**Marco Lopez**, University of Arizona, Tucson - "LINKAGE ANALYSIS WITH SIB-PAIR DATA,"
**Jaime Ramos**, Rice University

Pure Mathematics:

- "MINIMAL SURFACES IN FOUR DIMENSIONAL EUCLIDEAN SPACE,"
**Alexander Barrios**, Brown University and Miami Dade College. Alexander was also a contestant in the*Who Wants to Be a Mathematican*game. - "IMPROVING AN EXISTING PROGRAM THAT CHECKS FOR TIGHT STRUCTURES ON THE SOLID TORUS,"
**Christopher Toni**, Northeastern Illinois University

The reviewers of the student mathematics presentation abstracts were: **Joe Fred Gonzalez, Jr.** (CDC-National Center for Health Statistics), **Manuel Berriozabal** (University of Texas at San Antonio), **Rebecca Garcia** (Sam Houston State University), **Ken Lau **(MIT), **John Little** (College of the Holy Cross), **José Maria Menéndez Goméz **(University of Arizona), **Kenneth Millett** (UC Santa Barbara), **Karen Rios-Soto **(University fo Puerto Rico at Mayaguez) and **Jessica Zuniga** (Stanford University).

Read more about the 2009 SACNAS National Conference.

*--- Annette Emerson, AMS Public Awareness Officer*