Most Internet content today is "served" from a central system that takes requests from a user's "client." Typically, the user asks for access to information or other data; the requested content is then "pushed" from the central system to the user. In this model, the various visitors to a given web site do not interact. By contrast, peer-to-peer technology (commonly known as "P2P") creates conversations among individual personal computers (PCs). In this respect, P2P systems resemble an affili
California Fires MODIS imagery and TOMS Aerosols from October 2003
This animation sequences through the MODIS imagery of the devastating Californian fires from October 23, 2003 through October 29, 2003. Then the animation resets to October 23, 2003 and zooms out to see the TOMS aerosol sequence. It clearly shows that the California fires had an impact on air quality as far east as Maine.
China Dust Storm Pollutes Air in the Eastern United States in April 2001 (Flatmap)
A large dust storm develops over China on April 6 and 7, 2001. This animation shows the dust moving over China, Russia, Japan, the Pacific Ocean, and Canada, settling over the United States.
Transient Aerosol Features: North Atlantic Ocean from March to April 1988
Aerosol index over the North Atlantic from March 20, 1988 through April 9, 1988 as measured by the Nimbus-7 Total Ozone Mapping Spectrometer (TOMS)
Aerosols from Nimbus 7 TOMS: Transatlantic Dust Event in 1983
Saharan dust storms raise dust that is carried in the upper atmosphere across the Atlantic Ocean. That dust can land as far west as the Caribbean and the Americas. This dust can carry potentially hazardous bacteria and fungi.
Transatlantic Dust from North Africa (WMS)
Desert storms in northern Africa raise dust that is carried in the upper atmosphere across the Atlantic Ocean. The dust, which may carry potentially hazardous bacteria and fungi, can land as far west as the Caribbean and the Americas.
Continental Effects of 2004 Alaskan Fires (WMS)
Wildfires started by lightning burned more than 80,000 acres in Alaska in June 2004. The effects of these fires can be seen across North America with the Total Ozone Mapping Spectrometer (TOMS) instrument on the Earth Probe spacecraft. TOMS detects the presence of UV-absorbing tropospheric aerosols across the globe.
Aerosol Index over the Atlantic Ocean: July 1, 1988 to September 29, 1988
Aerosol index measurements indicating dust blowing westwards from Africa across the Atlantic Ocean during the period July 1, 1988 to September 29, 1988. as measured by Earth Probe TOMS
Sea Surface Temperature Anomalies during El Nino-La Nina Event of 1997-1998 (WMS)
The El Nino-La Nina event in 1997-1999 was particularly intense, but was also very well observed by satellites and buoys. A strong upwelling of unusually warm water was observed in the Pacific Ocean during the El Nino phase, followed by unusually cold water in the La Nina phase. The Advanced Very High Resolution Radiometer (AVHRR) instrument on the US National Oceanic and Atmospheric Administrations NOAA-14 spacecraft observed the changes in sea surface temperature shown here.
Infrared Astronomy: More Than Your Eyes Can See
This lithograph uses images of the well-known constellation of Orion to illustrate how a common astronomical object appears in both visible light and in the infrared. The back of the lithograph tells the history of infrared light and explains the benefits of infrared astronomy.
Intro to Information Privacy, Spring 2009
With the explosion of information technology, almost everyone has multiple computer and mobile devices that interact on the Internet. In addition, on-line social networking and sharing has become common place; for instance, Facebook, MySpace, and others. Personal information flows freely among us, even when taking a coffee break on a wireless network. Understanding how to protect your privacy is everyone’s business. This course gives an introduction to computer and network security from the pe
Yet Another Calculus Text
I intend this book to be, firstly, a introduction to calculus based on the hyperreal number system. In other words, I will use infinitesimal and infinite numbers freely. Just as most beginning calculus books provide no logical justification for the real number system, I will provide none for the hyperreals. The reader interested in questions of foundations should consult books such as Abraham Robinson's Non-standard Analysis or Robert Goldblatt's Lectures on the Hyperreals. Secondly, I have aime
Risk Management for Enterprises and Individuals
This book is intended for the Risk Management and Insurance course where Risk Management is emphasized. When we think of large risks, we often think in terms of natural hazards such as hurricanes, earthquakes or tornadoes Perhaps man-made disasters come to mind such as the terrorist attacks in the U.S. on September 11, 2001. Typically we have overlooked financial crises, such as the credit crisis of 2008. However, these types of man-made disasters have the potential to devastate the global mark
This course provides an overview of various tools and techniques you can use for improving a process. A brief introduction on Capability Maturity Models, Six Sigma and Lean is included as part of this short course. Level: Intermediate - Some analytical knowledge and experience is helpful in fully understanding all of the concepts presented in this course. Recommended for 2.0 hours of CPE. Course Method: Inter-active self study with self-grading exam, and certificate of completion.
This course provides a good overall understanding of how to manage projects. The course includes an overview of the Project Management Body of Knowledge (PMBOK) developed by the Project Management Institute. The course also includes a quick outline on Earned Value Management and touches on a few advanced topics such as Enterprise Architecture. Level: Introduction - No prior knowledge is required; however some business experience will help in understanding some of the concepts. Recommended for 2.
An Introduction to the Patent System
This 17-minute video is designed to be shown to jurors in patent jury trials. It contains important background information intended to help jurors understand what patents are, why they are needed, how inventors get them, the role of the Patent and Trademark Office, and why disputes over patents arise. An Introduction to the Patent System was developed with the assistance of an advisory committee of district judges and patent attorneys. Special care was taken to ensure that it provides an imparti
Lets us look over the shoulders of scientists and glimpse the often-unseen moments of investigation. Take virtual field trips to eight observatories -- Arecibo, where astrobiologists search for signs of life beyond the solar system; Las Cuevas, a research station in Central America's largest remaining rainforest; and others. See interviews, photos, and broadcasts that explore the origins of matter, the universe, and life itself.
This is a project to develop a document for teaching graduate econometrics that is "open source", specifically, licensed as GNU GPL. That is, anyone can access the document in editable form, and can modify it, as long as they make their modifications available. This allows for personalization, as well as a simple way to make contributions and error corrections. The hope is that people preparing to teach econometrics for the first time might find it useful, and eventually be motivated to contribu
The goal of the Genetic Origins Program is to allow students to use their own DNA variations (polymorphisms) as a means to explore our shared genetic heritage and its implications for human health and society. Genetic Origins focuses on two types of DNA variations: an Alu insertion polymorphism on chromosome 16 (PV92) and single nucleotide polymorphisms (SNPs) in the control region of the mitochondrial (mt) chromosome. With two alleles and three genotypes, PV92 is a simple genetic system that il
This animation represents the case of frictionless motion of an object that experiences a centripetal force. More specifically, the strength of the centripetal force is proportional to the distance to the central axis of rotation. A proportional centripetal force is very symmetrical and the motion under the influence of that force has distinctive properties.