Balance and flux
Ecosystems and populations of organisms within ecosystems function by the principle of balance and flux. Balance can be thought of as a state of equilibrium, or a state of equal changes between two sides. Flux can be thought of as a rate of flow or changes. Even small changes in an ecosystem's or population's balance and flux could lead to disaster.
Aquatic Animal Skeleton - Backbone
The backbone of an aquatic animal allows it to be very flexible under water. It usually extends into a tail and is classified as a gliding joint.
A 3-Dimensional Model of the Magnetosphere (WMS)
The earths magnetosphere protects the earth from high-energy charged particles coming from the sun. Some charged particles are deflected by the magnetosphere, while others become trapped and produce the aurora. This presentation shows a 3-dimensional model of the magnetosphere. The features that it highlights are flat ribbons representing the paths of charged particles deflected by the magnetosphere, triangular ribbons representing magnetic field lines, and colored surfaces representing constant
Pearl River, China (with window)
Zoom down to land reclamation from the river delta. Dissolve between data collected in 1988, 1992, and 1995.
1993 Daily Ozone from Meteor-3
In this animation of total ozone, the luminance values of the colors bounding areas of missing data are used in interpolating over these regions. The missing data are mapped to the grayscale portion of the color map.
Hurricanes as Heat Engines
As water vapor evaporates from the warm ocean surface, it is forced upward in the convective clouds that surround the eyewall and rainband regions of a storm. As the water vapor cools and condenses from a gas back to a liquid state, it releases latent heat. The release of latent heat warms the surrounding air, making it lighter and thus promoting more vigorous cloud development.
Antarctic Ozone from TOMS: July 15, 2001 to October 9, 2001
Satellite data show the area of this years Antarctic ozone hole peaked at about 26 million square kilometers -- roughly the size of North America -- making the hole similar in size to those of the past three years, according to scientists from NASA and the National Oceanic and Atmospheric Administration (NOAA). Researchers have observed a leveling-off of the hole size and predict a slow recovery.
Clouds over North America from GOES-11: August 3, 2000
This animation is one of a series showing the first data from GOES-11. The data shown was taken at one-minute intervals.
Drawings & Numbers: Five Centuries of Digital Design, Fall 2002
Seminar on a selected topic from Renaissance architecture. Requires original research and presentation of a report. The aim of this course is to highlight some technical aspects of the classical tradition in architecture that have so far received only sporadic attention. It is well known that quantification has always been an essential component of classical design: proportional systems in particular have been keenly investigated. But the actual technical tools whereby quantitative precision was
Tropical Environmental Health
Inadequate water supplies and lack of sanitation facilities represent major hazards to the public health in many parts of the world. In spite of the International Water Supply Decade, (1980-1990) there are more people without facilities approaching minimum standards now than existed at the beginning of the program. Without improvements in these areas, there can be no hope that there will be an overall improvement in the health of the nations which constitute the Third World. Yet appropriate tech
Statistics for Laboratory Scientists II
This course introduces the basic concepts and methods of statistics with applications in the experimental biological sciences. Demonstrates methods of exploring, organizing, and presenting data, and introduces the fundamentals of probability. Presents the foundations of statistical inference, including the concepts of parameters and estimates and the use of the likelihood function, confidence intervals, and hypothesis tests. Topics include experimental design, linear regression, the analysis of
Statistics for Laboratory Scientists I
This course introduces the basic concepts and methods of statistics with applications in the experimental biological sciences. Demonstrates methods of exploring, organizing, and presenting data, and introduces the fundamentals of probability. Presents the foundations of statistical inference, including the concepts of parameters and estimates and the use of the likelihood function, confidence intervals, and hypothesis tests. Topics include experimental design, linear regression, the analysis of
Pharmaceuticals Management for Under-served Populations
Students will be guided to analyze problems and develop strategies based on real world drug management issues including regulations, manufacture, procurement, distribution, safety, policy, financing and the unique aspects of international pharmaceutical trade, the role of the World Trade Organization - Trade-Related Aspects of Intellectual Property Rights (WTO-TRIPS), government, non-governmental organizations (NGOs) and individuals/programs in the selection and use of pharmaceutical products. C
Global Tobacco Control
Provides an introduction to global tobacco control. Presents the health and economic burden of tobacco use worldwide and highlights practical approaches to tobacco prevention, control, surveillance, and evaluation. Examines transnational tobacco control issues, including the following: the interpretation and packaging of epidemiologic evidence for policy makers, the determinants of tobacco addiction, the economics of global tobacco control, tobacco industry strategies, legal foundations for regu
Ethics of Human Subject Research
Ethics of Human Subject Research (2 credits) is offered by the Department of Health Policy and Management and the Distance Education Division, Johns Hopkins Bloomberg School of Public Health and The Phoebe R. Berman Bioethics Institute, Johns Hopkins University. The course introduces students to the ethics of human subject research. Ethical theory and principles are introduced, followed by a brief history of research ethics. Topics covered in lectures and moderated discussions include informed c
Ethical Issues in Public Health
Lectures and small group discussions focus on ethical theory and current ethical issues in public health and health policy, including resource allocation, the use of summary measures of health, the right to health care, and conflicts between autonomy and health promotion efforts. Student evaluation based on class participation, a group project, and a paper evaluating ethical issues in the student's area of public health specialization.
Essentials of Probability and Statistical Inference IV: Algorithmic and Nonparametric Approaches
Introduces the theory and application of modern, computationally-based methods for exploring and drawing inferences from data. Covers re-sampling methods, non-parametric regression, prediction, and dimension reduction and clustering. Specific topics include Monte Carlo simulation, bootstrap cross-validation, splines, local weighted regression, CART, random forests, neural networks, support vector machines, and hierarchical clustering. De-emphasizes proofs and replaces them with extended discussi
Social and Behavioral Foundations of Primary Health Care
Social and Behavioral Foundations of Primary Health Care aims at providing you with the knowledge and skills needed to diagnose (understand) community, individual, and organizational behaviors and change processes in developing countries and in cross-cultural settings as a foundation for planning culturally appropriate primary health care (PHC) in the context of the ecological model of health behavior.
Analog Integrated Circuit Design
An introductory course in analog circuit synthesis for microelectronic designers. Topics include: Review of analog design basics; linear and non-linear analog building blocks: harmonic oscillators, (static and dynamic) translinear circuits, wideband amplifiers, filters; physical layout for robust analog circuits; design of voltage sources ranging from simple voltage dividers to high-performance bandgaps, and current source implementations from a single resistor to high-quality references based o
Structured Electronic Design
This course focuses on a systematic approach to the design of analog electronic circuits. The methodology presented in the course is based on the concepts of hierarchy, orthogonality and efficient modeling. It is applied to the design of negative-feedback amplifiers. It is shown that aspects such as ideal transfer; noise performance, distortion and bandwidth can be optimized independently. A systematic approach to biasing completes the discussion. Lectures are interactive and combined with weekl
