| Small_Satellites_Home_Page Historical archive and resource for small satellite missions. The page is maintained by researchers in the Surrey Space Centre at the University of Surrey, UK. |
| Space_Systems_for_Astronomical_Observation This paper was assigned in our "Introduction to Engineering" class at the University of Michigan (Fall 99). The group has researched various systems for the advancement of astronomical observation, in |
| Student_Nitric_Oxide_Explorer SNOE is a small scientific satellite that is measuring the effects of energy from the sun and from the magnetosphere on the density of nitric oxide in the Earth's upper atmosphere. |
| Surrey_Satellite_Technology_Limited News and information about this commercial wing of the Surrey Space Centre at the University of Surrey. Includes details of the company, its satellites, services and missions. |
| Tech_Museum_-_The_Satellite_Site Includes general information, orbit listings, background, and Java-based satellite construction simulator. |
| Unmanned_Space_Experiment_Recovery_System Project overview and data on a Japanese spacecraft with a re-entry module for materials experiments. |
| WorldSat_International_Inc_ A producer of satellite maps and posters, atlas of the world, earth globes, interactive cd-roms, and stock photography. |
| Altered_Images A web site introducing digital imagery technology to young students and teachers, explains what this technology is and demonstrates how to use it in easy-to-do tutorials. |
| Concentration_in_Technology,_Literacy_and_Culture TLC is a concentration in the School of Liberal Arts at the University of Texas at Austin. |
| Dawg_Bytes Grandville High School Technology Education website. Includes online classes, tutorials, and links. |
| Educator\'s_Corner For any educator or student interested in engineering. |
| Global_Wireless_Education_Consortium Wireless topic curriculum for colleges - developed by industry. |
| How_Stuff_Works__Electric_Motor Close-up photographic tour of the inside of an electric motor. |
| Java_Applets_for_Engineering_Education intended to illustrate a variety of engineering concepts. |
| NASA_Education Offers a range of resoueces for students and educators. |
| Professional_Development_Hours Provides continuing education units and learning units for engineer and architect classes. Material can be browsed for free. |
| Technology_Student_Association_-_TSA Non-profit national student organization devoted to teaching technology education to young people. Includes conferences, resources and publications, and competitive events. |
| TekMom\'s_Page_for_Computer_Teachers For K-8 Technology Teachers. Links to pages on instructional technology, web publishing, graphics tools and tech troubleshooting. |
| AEI-Brookings_Joint_Center_for_Regulatory_Studies Analyzes regulatory programs, proposals, and emerging issues related to the environment, health, network industries, the internet, deregulation, and the regulatory process. Site provides information a |
| American_Talk_Issues__Polling Provides information about public interest polling and its relation to public opinion. Includes information about the book "Locating Consensus for Democracy" by Alan F. Kay. |
| Arizona_Center_for_Public_Policy Independent research center dedicated to delivering thorough information on Arizona's key policy issues. Mission, leadership and research topics. |
| The_Burden_of_Bad_Ideas In this book Heather Mac Donald critizes the effects of today's elite thought throughout society. Introduction, reviews and links. |
| The_Electronic_Hallway Offers teaching cases, exercises, role-plays, teaching workshops, and curriculum planning resources to faculty focusing on public administration and public policy. |
| The_H__John_Heinz_III_School_of_Public_Policy_and_Management_Web_Site The Heinz School curriculum focuses on areas that included quantitative analysis, modeling, conomics and statistics. |
| History_and_Policy National platform to offer insights from recent historical research to assist policy makers and advisers. Contains several scholarly papers on the subject. |
| Introduction_to_Social_Policy Social Policy is the study of the welfare state, and the range of responses to social need. This is a brief introduction to the subject. |
| Issues_in_Science_&_Technology A publication of the National Academy of Sciences, the National Academy of Engineering, and the Cecil and Ida Green Center for the Study of Science and Society at the University of Texas at Dallas. |
| Moving_Ideas_Network Issues and commentary from a progressive perspective. |
| Pepperdine_University_School_of_Public_Policy Information on the Masters in Public Policy program, educational conferences, research, students, admissions, financial aid, faculty members, and research fellows. Online application. |
| Policy_Library Extensive database of think tank and academic papers on social, economic, and foreign policy from around the world. Also provides information about policy jobs, courses, research resources, and events |
| Program_on_International_Policy_Attitudes_(PIPA) Researches the American public's attitudes on international issues by conducting nationwide polls, focus groups and comprehensive reviews of polling conducted by other organizations. |
| Research_Forum_on_Children,_Families,_and_the_New_Federalism Encourages collaborative research and informed policy on welfare reform and child well-being. Research projects, key topics, publications and links. |
| The_Robertson_School_of_Government Seeks to restore our nation's Judeo-Christian heritage, to renew the traditional values of citizenship in the public affairs of the United States. Leadership and policy issues are rigorously analyzed |
| The_Rockridge_Institute Think tank for progressive politics and public policies. Articles, activities and staff. |
| Terry_Sanford_Institute_of_Public_Policy The Terry Sanford Institute of Public Policy at Duke University is dedicated to educating tomorrow's leaders and improving the quality of public policymaking through scholarly research, undergradua |
| Biodegradable_Plastic_Resin University of Nebraska Institute of Natural Resources offers to supply information on a patented product made from starch. |
| Biostable_and_biocompatible_polymers Abstracts of selected publications and patents dealing with biostable and biocompatible thermoplastic and segmented polyurethanes. |
| Elastomer_Engineering_and_Testing Consults or performs finite element analysis, stress strain, fatigue, crack growth, and tearing energy testing on elastomers or rubber materials and components. |
| Photopolymer_com A site for information and ecommerce on radiation-curable and imageable polymers. These polymers are used as photoresists, coatings, inks, adhesives, printing plates etc. |
| Plastemart_com Provides information on plastics and environment, associations and institutions, books and publications, news and a discussion forum. |
fig-1
This general geometry can be better drawn in Fig-2 to understand optimum
strategy. Instead of shifting (k1,h1) to (k2,h2) we can shift frame (k,h) with
the same amount of Dv but in the reverse direction. With this representation
inclination curve becomes free evolution during T1+T2 period of time. Distance
between centers of two circles gives nothing but Dv, maneuver size.
Fig-2
If we go further to perform maneuvers during lifetime of satellite , we would
get a picture like in Fig-3. Here we can state the optimum problem :
Minimize R1+R2+R3...Rn by changing centers of circles and with a constrain such
that each beginning and end of cycle points will remain in the corresponding
circle.
Fig-3
Any one can easily see that if we can put all the centers of circles to the line
connecting the first and the last circle centers, R1+R2+R3..+Rn will be the
minimum. It seems like to put all the cycle points inside a "pipe".
Fig-4
When we are positioning the last circle, we must locate it such as the end of
life point will be on the circle and optimum line must intersect bith the center
of last circle and the end of life point.This allows us to leave inclination
free without making any maneuver till the end of life for the last cycle, as
seen in Fig-5.
Fig-5
Once the optimum line determined , other center of circles can be located
freely. But circle must include both cycle points. We can choose the closest
point to the optimum line (ofcourse this is not unique solution). If we align
center of circle in this way , inclination at the start of maneuver and end of
maneuver must be equal.
Fig-6
You can send your comments to Senol Gulgonul
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