*60%*:**Experts' Understanding of Partial Derivatives Using the Partial Derivative Machine***54%*:**Assessing Student Understanding of Partial Derivatives in Thermodynamics***51%*:**The Partial Derivative Machine***43%*:**Examining the Evolution of Student Ideas About Quantum Tunneling***43%*:**Student Interpretation of the Signs of Definite Integrals Using Graphical Representations***42%*:**Student (Mis)application of Partial Differentiation to Material Properties***41%*:**Upper-Division Students' Use of Separation of Variables***41%*:**Student responses to chain rule problems in thermodynamics***41%*:**The use of ACER to develop and analyze student responses to expectation value problems***41%*:**Investigate Studentsâ€™ use of Boundary Conditions using Symbolic Forms***40%*:**Arrows as anchors: Conceptual blending and student use of electric field vector arrows***40%*:**Upper-Level Physics Studentsâ€™ Conceptions Of Understanding***39%*:**What happens between pre- and post-tests: Multiple measurements of student understanding during an introductory physics course***39%*:**Studentsâ€™ use of resources in understanding solar cells***39%*:**Effects of Training Examples on Student Understanding of Force and Motion***39%*:**Introductory Physics Students Retention of Conceptual Understanding of Forces***39%*:**Examining students' personal epistemology: the role of physics experiments and relation with theory***39%*:**Student interpretations of uncertainty in classical and quantum mechanics experiments***39%*:**Impact on students' views of experimental physics from a large introductory physics lab course**