Stanford University
Showing 831-840 of 1,021 Results
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William Nix
Lee Otterson Professor in the School of Engineering, Emeritus
BioI have been engaged in the study of mechanical properties of materials for nearly 50 years. My early work was on high temperature creep and fracture of metals, focusing on techniques for measuring internal back stresses in deforming metals and featuring the modeling of diffusional deformation and cavity growth processes. My students and I also studied high temperature dispersion strengthening mechanisms and described the effects of threshold stresses on these creep processes. Since the mid-1980's we have focused most of our attention on the mechanical properties of thin film materials used in microprocessors and related devices. We have developed many of the techniques that are now used to study of thin film mechanical properties, including nanoindentation, substrate curvature methods, bulge testing methods and the mechanical testing of micromachined (MEMS) structures. We are also known for our work on the mechanisms of strain relaxation in heteroepitaxial thin films and plastic deformation of thin metal films on substrates. In addition we have engaged in research on the growth, characterization and modeling of thin film microstructures, especially as they relate to the development of intrinsic stresses. Some of our recent work dealt with the mechanical properties of nanostructures and with strain gradients and size effects on the mechanical properties of crystalline materials. Our most recent work deals with the mechanical properties of lithiated nanostructures that are being considered for lithium-ion battery applications.
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Joyce Njoroge, MD
Clinical Assistant Professor, Medicine - Cardiovascular Medicine
BioDr. Njoroge is a board-certified physician and fellowship-trained cardiologist with the Advanced Heart Failure Program at Stanford Health Care. She is also a clinical assistant professor of medicine in the Division of Cardiovascular Medicine.
Dr. Njoroge has extensive clinical experience diagnosing and treating cardiovascular complications that develop during pregnancy or postpartum. She currently provides care at the Stanford Health Care Heart and Vascular Clinic with a particular focus on patients with a history of pregnancy-associated heart failure and cardiomyopathy.
Dr. Njoroge’s research efforts involve identifying inherited genetic changes and biological markers that could help improve screening and care for pregnant women in higher risk populations. This includes determining the causes of disproportionately high incidences of heart-related complications and deaths experienced by Black women during and after pregnancy. Dr. Njoroge is also currently recruiting patients for a large-scale, multicenter clinical trial evaluating a drug to treat cardiovascular complications during pregnancy.
Dr. Njoroge has published her work in numerous prestigious peer-reviewed journals, including Circulation Research and the Journal of Cardiac Failure. She also co-authored a chapter on cardiovascular disease in pregnancy in the most recent edition of the book Current Diagnosis and Treatment: Cardiology.
Dr. Njoroge is a member of the Association of Black Cardiologists, the American College of Cardiology, the American Heart Association, and the Heart Failure Society of America.
