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October, 2006
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Magnetic Fields: Areas of attractive or repulsive force surrounding Magnets.

Magnetic Fields

JoVE 10384

Source: Yong P. Chen, PhD, Department of Physics & Astronomy, College of Science, Purdue University, West Lafayette, IN

Magnetic fields can be generated by moving charges, such as an electrical current. The magnetic field generated by a current can be calculated from the Maxwell equation. In addition, magnetic objects such as bar…

 Physics II

Electric Charge in a Magnetic Field

JoVE 10133

Source: Andrew Duffy, PhD, Department of Physics, Boston University, Boston, MA

This experiment duplicates J.J. Thomson's famous experiment at the end of the 19th century, in which he measured the charge-to-mass ratio of the electron. In combination with Robert A. Millikan's oil-drop experiment a few years later that produced a value for…

 Physics II

The Evans Method

JoVE 10304

Source: Tamara M. Powers, Department of Chemistry, Texas A&M University 

While most organic molecules are diamagnetic, wherein all their electrons are paired up in bonds, many transition metal complexes are paramagnetic, which has ground states with unpaired electrons. Recall Hund's rule, which states that for orbitals of…

 Inorganic Chemistry

DC Motors

JoVE 10166

Source: Ali Bazzi, Department of Electrical Engineering, University of Connecticut, Storrs, CT.

The DC machine operates with DC currents and voltages as opposed to an AC machine, which requires AC currents and voltages. DC machines were the first to be invented and utilize two magnetic fields that are controlled by DC currents. The same…

 Electrical Engineering

Computational Fluid Dynamics Simulations of Blood Flow in a Cerebral Aneurysm

JoVE 10479

Source: Joseph C. Muskat, Vitaliy L. Rayz, and Craig J. Goergen, Weldon School of Biomedical Engineering, Purdue University, West Lafayette, Indiana

The objective of this video is to describe recent advancements of computational fluid dynamic (CFD) simulations based on patient- or animal-specific vasculature. Here,…

 Biomedical Engineering

Animal Behavior- Concept

JoVE 10582

Drosophila as a Model Organism

The common fruit fly, Drosophila melanogaster, is a widely used model organism in biology, though it may be more commonly recognized as a fruit-loving pest. There are multiple reasons that make D. melanogaster an excellent experimental organism: their roughly two-week generation time allows studying multiple generations, they are…

 Lab Bio

An Introduction to Cognition

JoVE 5419

Cognition encompasses mental processes such as memory, perception, decision-making reasoning and language. Cognitive scientists are using a combination of behavioral and neuropsychological techniques to investigate the underlying neural substrates of cognition. They are interested in understanding how information is perceived, processed and how does it affect the final execution of behaviors.…

 Behavioral Science

AC Synchronous Machine Characterization

JoVE 10168

Source: Ali Bazzi, Department of Electrical Engineering, University of Connecticut, Storrs, CT.

Three-phase wound-rotor synchronous motors are less popular than permanent magnet rotor synchronous motors due to the brushes required for the rotor field. Synchronous generators are much more common and available in most existing power plants,…

 Electrical Engineering

AC Induction Motor Characterization

JoVE 10150

Source: Ali Bazzi, Department of Electrical Engineering, University of Connecticut, Storrs, CT.

The objectives of this experiment are to find the equivalent circuit parameters of a three-phase induction motor using the per-phase equivalent circuit and tests similar to those used in transformer characterization. In electrical engineering,…

 Electrical Engineering

AC Synchronous Machine Synchronization

JoVE 10167

Source: Ali Bazzi, Department of Electrical Engineering, University of Connecticut, Storrs, CT.

Three-phase wound-rotor synchronous generators are the main source of electrical power worldwide. They require a prime mover and an exciter in order to generate power. The prime mover can be a turbine spun by fluid (gas or liquid), thus the…

 Electrical Engineering

An Introduction to Learning and Memory

JoVE 5416

Learning is the process of acquiring new information and memory is the retention or storage of that information. Different types of learning, such as non-associative and associative learning, and different types of memory, such as long-term and short-term memory, have been associated with human behaviors. Studying these components in detail helps behavioral scientists understand the neural…

 Behavioral Science

Electrochemical Biosensing

JoVE 5796

Electrochemical biosensors detect the binding of a target molecule by sensing an oxidation-reduction event. These sensors paved the way for modern biosensing after the invention of the glucose biosensor. This video will introduce electrochemical biosensing, show the workings of the glucose biosensor, and discuss how electrochemical biosensors are used in cancer…


SEM Imaging of Biological Samples

JoVE 10492

Source: Peiman Shahbeigi-Roodposhti and Sina Shahbazmohamadi, Biomedical Engineering Department, University of Connecticut, Storrs, Connecticut

A scanning electron microscope (SEM) is an instrument that uses an electron beam to nondestructively image and characterize conductive materials in a vacuum. As an analogy, an…

 Biomedical Engineering

Quantitative Magnetic Resonance Imaging of Skeletal Muscle Disease

1Institute of Imaging Science, Vanderbilt University, 2Department of Radiology and Radiological Sciences, Vanderbilt University, 3Department of Biomedical Engineering, Vanderbilt University, 4Department of Molecular Physiology and Biophysics, Vanderbilt University, 5Department of Physical Medicine and Rehabilitation, Vanderbilt University, 6Department of Physics and Astronomy, Vanderbilt University

JoVE 52352


The Use of Magnetic Resonance Spectroscopy as a Tool for the Measurement of Bi-hemispheric Transcranial Electric Stimulation Effects on Primary Motor Cortex Metabolism

1Department of Psychology, University of Montréal, 2Montreal Neurological Institute, McGill University, 3Center for Magnetic Resonance Research and Department of Radiology, University of Minnesota

JoVE 51631


Interictal High Frequency Oscillations Detected with Simultaneous Magnetoencephalography and Electroencephalography as Biomarker of Pediatric Epilepsy

1Fetal-Neonatal Neuroimaging and Developmental Science Center, Division of Newborn Medicine, Department of Medicine, Boston Children's Hospital, Harvard Medical School, 2Athinoula A. Martinos Center for Biomedical Imaging, Massachusetts General Hospital, Harvard Medical School, 3Division of Epilepsy Surgery, Department of Neurosurgery, Boston Children's Hospital, Harvard Medical School, 4Division of Epilepsy and Clinical Neurophysiology, Department of Neurology, Boston Children's Hospital, Harvard Medical School

JoVE 54883


Recording Brain Electromagnetic Activity During the Administration of the Gaseous Anesthetic Agents Xenon and Nitrous Oxide in Healthy Volunteers

1Centre for Human Psychopharmacology, Swinburne University of Technology, 2Department of Anaesthesia and Pain Management, St. Vincent's Hospital Melbourne, 3Brain and Psychological Science Research Centre, Swinburne University of Technology, 4Department of Anaesthesiology, University of Auckland

JoVE 56881


Non-Invasive Modulation and Robotic Mapping of Motor Cortex in the Developing Brain

1Department of Neurosciences, University of Calgary, 2Hotchkiss Brain Institute, University of Calgary, 3Cumming School of Medicine, University of Calgary, 4Department of Pediatrics, University of Calgary, 5Alberta Children's Hospital Research Institute, University of Calgary, 6Faculty of Medicine and Dentistry, University of Alberta, 7Department of Clinical Neurosciences, University of Calgary

JoVE 59594


Studying Brain Function in Children Using Magnetoencephalography

1ARC Centre of Excellence in Cognition and its Disorders, Macquarie University, 2Department of Cognitive Science, Macquarie University, 3Aston Brain Centre, School of Life and Health Sciences, Aston University, 4Department of Linguistics, Macquarie University

JoVE 58909


Optimization, Test and Diagnostics of Miniaturized Hall Thrusters

1Plasma Sources and Applications Centre, National Institute of Education, Nanyang Technological University, 2School of Chemistry, Physics, Mechanical Engineering, Queensland University of Technology, 3Department of Physics, School of Science, Hangzhou Dianzi University

JoVE 58466


A Random-displacement Measurement by Combining a Magnetic Scale and Two Fiber Bragg Gratings

1School of Instrument Science and Opto-electronics Engineering, Beijing Information Science and Technology University, 2Beijing Engineering Research Center of Optoelectronic Information and Instruments, Beijing Key Laboratory for Optoelectronics Measurement Technology, 3School of Precision Instrument & Opto-electronics Engineering, Tianjin University of Science and Technology, 4School of Precision Instrument and Opto-electronics Engineering, State Key Laboratory of Precision Measuring Technology and Instruments, Tianjin University, 5School of Instrument and Opto-electronics Engineering, Hefei University of Technology

JoVE 58182


Cardiac Magnetic Resonance Imaging at 7 Tesla

1The Centre for Advanced Imaging, The University of Queensland, Brisbane, Australia, 2Department of Diagnostic and Interventional Radiology, University Clinic Würzburg, Würzburg, Germany, 3Siemens Healthcare Pty Ltd, Brisbane, Australia, 4Richard Slaughter Centre of Excellence in CVMRI, The Prince Charles Hospital, Brisbane, Australia, 5MRI.Tools GmbH, Berlin, Germany

JoVE 55853


Methods of Ex Situ and In Situ Investigations of Structural Transformations: The Case of Crystallization of Metallic Glasses

1Institute of Nuclear and Physical Engineering, Slovak University of Technology in Bratislava, Slovakia, 2Department of Nuclear Reactors, Czech Technical University in Prague, Czech Republic, 3Department of Experimental Physics, Palacky University Olomouc, Czech Republic, 4Institute of Physics, Slovak Academy of Sciences, Bratislava, Slovakia, 5Institute of Laboratory Research on Geomaterials, Faculty of Natural Sciences, Comenius University in Bratislava, Slovakia

JoVE 57657

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