*72%*:**Student difficulties with quantum states while translating state vectors in Dirac notation to wave functions in position and momentum representations***56%*:**Investigating Student Difficulties with Time dependence of Expectation Values in Quantum Mechanics***54%*:**Investigating Student Understanding of Perturbation Theory and the Inner Products of Functions***50%*:**Student difficulties with representations of quantum operators corresponding to observables***48%*:**Improving student understanding of Dirac notation by using analogical reasoning in the context of a three-dimensional vector space***41%*:**Investigating a collaborative group exam as an instructional tool to address student reasoning difficulties that remain even after instruction***40%*:**Investigating student understanding of basic quantum mechanics in the context of time-dependent perturbation theory***39%*:**Investigating the Relationship Between Student Difficulties with the Concept of Electric Potential and the Concept of Rate of Change***39%*:**Exploring Student Difficulties with Buoyancy***38%*:**Investigating the Relationship between Active Learning Task Characteristics and Student Success***37%*:**Investigating how graduate students connect microstates and macrostates with entropy***37%*:**Examining student understanding of matrix algebra and eigentheory***37%*:**Improving studentsâ€™ understanding of quantum measurement. I. Investigation of difficulties***37%*:**Exploring student difficulties with pressure in a fluid***37%*:**Student difficulties with determining expectation values in quantum mechanics***37%*:**Investigating introductory student difficulties reading equipotential diagrams***36%*:**Force Concept Inventory-based multiple-choice test for investigating students' representational consistency***36%*:**Students as Co-creators: the Development of Student Learning Networks in PeerWise***36%*:**Student Difficulties with the Dirac Delta Function**