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Articles 451 - 480 of 2437
Full-Text Articles in Physical Sciences and Mathematics
Bringing The Moon Into The Classroom, Laurence A. Marschall
Bringing The Moon Into The Classroom, Laurence A. Marschall
Physics and Astronomy Faculty Publications
Understanding the phases of the Moon is a perennial stumbling block in introductory astronomy classes. In the film, "A Private Universe," for instance, both Harvard graduates and gifted high-school students display serious misconceptions about the Moon's phases, believing, among other things, that the Earth's shadow on the Moon is the cause of it all. Part of the problem may stem from textbook illustrations that show a view of the Moon in orbit around the Earth with the Sun of to one side. Students have trouble converting mentally from this "God's eye" perspective into the "geocentric" perspective we experience as observers …
Observationsof Inner-Plasmasphere Irregularities With A Satellite Beacon Interferometer Array, A. R. Jacobsen, G. Hogeveen, R. C. Carlos, G. Wu, Bela G. Fejer, M. C. Kelley
Observationsof Inner-Plasmasphere Irregularities With A Satellite Beacon Interferometer Array, A. R. Jacobsen, G. Hogeveen, R. C. Carlos, G. Wu, Bela G. Fejer, M. C. Kelley
Bela G. Fejer
A radio-interferometer array illuminated by 136-MHz beacons of several geosynchronous satellites has been used to study small (≥ 1013 m−2) transient disturbances in the total electron content along the lines of sight to the satellites. High-frequency (ƒ> 3 mHz) electron content oscillations are persistently observed, particularly during night and particularly during geomagnetically disturbed periods. The oscillations move across the array plane at speeds in the range 200–2000 m/s, with propagation azimuths that are strongly peaked in lobes toward the western half-plane. Detailed analysis of this azimuth behavior, involving comparison between observations on various satellite positions, indicates compellingly that the phase …
The Prairie Naturalist Volume 28, No. 3. September 1996
The Prairie Naturalist Volume 28, No. 3. September 1996
The Prairie Naturalist
REPRODUCTIVE SUCCESS OF GRASSHOPPER SPARROWS IN RELATION TO EDGE ▪ J. M Delisle, and J. A. Savidge
OBSERVATIONS ON BATS AT BADLANDS NATIONAL PARK, SOUTH DAKOTA ▪ M A. Bogan, J. G. Osborne, and J. A. Clarke
DIETS OF FEMALE WHITE-TAILED DEER IN THE CROSS-TIMBERS REGION ▪ F. C. Bryant, G. Van Vreede, T. J. Deliberto, and K. L. Gee
NOTES
Second Record of White Ibis in North Dakota ▪ J. W. Marlow, L. D. Igl, and M. R. Hartman
A Recent Record of Mountain Lion in Nebraska ▪ H. H. Genoways and P. W. Freeman
Prairie Falcon Predation on …
Nutrients And Chlorophyll At The Shelf Break Off The Southeastern United States During The Genesis Of Atlantic Lows Experiment: Winter 1986, L. P. Atkinson, J. L. Miller, T. N. Lee, W. M. Dunstan
Nutrients And Chlorophyll At The Shelf Break Off The Southeastern United States During The Genesis Of Atlantic Lows Experiment: Winter 1986, L. P. Atkinson, J. L. Miller, T. N. Lee, W. M. Dunstan
CCPO Publications
The outer shelf and upper slope off Charleston, South Carolina, were the site of oceanographic and meteorological measurements during the winter of 1986. The purpose of the study was to test ideas about front formation, heat transport, and stratification during cold air outbreaks. An ancillary part of the study was the observation of nutrients and chlorophyll concentrations. The observations extended across the shelf and sometimes crossed the Gulf Stream front. The results show slightly elevated nitrate concentrations in outer shelf waters (1 - 2 μM NO3) with chlorophyll concentrations in the 1 - 1.8 μg L-1 range. …
Distribution And Abundance Of Roof-Nesting Gulls In The Great Lakes Region Of The United States, Chris P. Dwyer, Jerrod L. Belant, Richard A. Dolbeer
Distribution And Abundance Of Roof-Nesting Gulls In The Great Lakes Region Of The United States, Chris P. Dwyer, Jerrod L. Belant, Richard A. Dolbeer
United States Department of Agriculture Wildlife Services: Staff Publications
In 1994, we conducted aerial, mail, and telephone surveys to determine the distribution and abundance of roof-nesting gulls in states bordering the Great Lakes. We documented more than 7,922 nesting pairs of gulls at 30 colonies in four states; species composition was 71% ring-billed (Larus delawarensis^, 24% herring (Z. argentatus^, and 5% unknown. Colony size ranged from 1 to 1,003 nesting pairs. Proportions of ring-billed gulls nesting less that 5.0 and more than 10.0 km from the Great Lakes were 31% and 39%, in contrast to 63% and less than 1% for herring gulls, respectively. Maximum distances herring and ring-billed …
The Design Of A Financial Management Database System, Edward G. Leszynski
The Design Of A Financial Management Database System, Edward G. Leszynski
Theses and Dissertations
This research led to the design and development of a financial management database system for the Aeronautical Systems Center (AS C) Environmental Management (EM) Systems Program Office (SPO), which has the responsibility of managing the environmental contracts for the Government-Owned, Contractor-Operated (GOCO) plants that are owned by the Air Force. This thesis investigated the various 'development strategies' and 'methodologies' described in the Management Information Systems literature in order to devise an end-user development strategy capable of meeting the EM SPO's requirements. In addition, the information requirements, conceptual design and prototyping, and procedures phases of the System Development Life Cycle (SDLC) …
Center For Sustainable Agricultural Systems Newsletter, September/October 1996
Center For Sustainable Agricultural Systems Newsletter, September/October 1996
Center for Sustainable Agricultural Systems: Newsletters (1993-2000)
Contents: Restoring Productivity, Profit, and Ecological Integrity in Chile Specialty Food Products Field Day a Success Glickman Lauds Farmers' Markets for Consumers and Farmers Windbreaks Help Pepper Production Integrated Farm Update: Visitor Comments Minigrants Awarded for Sustainable Ag Education Satellite Programs on 1996 Farm Bill Number of Nation's Large Farms Increases Call for Papers on Ogallala Aquifer
Background Graphics: A Decision-Making Hindrance Or Enhancement?, David L. Peeler Jr.
Background Graphics: A Decision-Making Hindrance Or Enhancement?, David L. Peeler Jr.
Theses and Dissertations
This thesis investigated the influence, if any, of background graphics on the decision making process. Specifically the hypotheses tested the affect of background graphics on a decision makers accuracy and confidence. A literature review revealed an abundance of graphic research but little reference to the use of background graphics. Using guidelines previously created for high integrity graphics, a timed 2 x 2 factorial experimental design was developed to compare the responses to both traditional graphics and those treated with background graphics. One hundred forty-seven subjects, all employees of the United States Air Force or defense contractors were involved in the …
Transportable Agents Support Worldwide Applications, David Kotz, Robert Gray, Daniela Rus
Transportable Agents Support Worldwide Applications, David Kotz, Robert Gray, Daniela Rus
Dartmouth Scholarship
Worldwide applications exist in an environment that is inherently distributed, dynamic, heterogeneous, insecure, unreliable, and unpredictable. In particular, the latency and bandwidth of network connections varies tremendously from place to place and time to time, particularly when considering wireless networks, mobile devices, and satellite connections. Applications in this environment must be able to adapt to different and changing conditions. We believe that transportable autonomous agents provide an excellent mechanism for the construction of such applications. We describe our prototype transportable-agent system and several applications.
Worldwide applications exist in an environment that is inherently distributed, dynamic, heterogeneous, insecure, unreliable, and unpredictable. …
สัตว์ป่าจากวันวานถึงวันพรุ่ง, ประยงค์ อัฒจักร
รีไซเคิลกันอีกรอบ, ธัญญา พรโภคิน
เชื้อเพลิงสะอาด, วินัย สมบูรณ์
จับตากฎหมายใหม่เพิ่มประเภทโครงการที่จะต้องทำ Eia, อุษณีย์ ศิริสุนทรไพบูลย์
จับตากฎหมายใหม่เพิ่มประเภทโครงการที่จะต้องทำ Eia, อุษณีย์ ศิริสุนทรไพบูลย์
Thai Environment
No abstract provided.
ก๊าซชีวภาพจากการบำบัดน้ำเสียโรงเบียร์ด้วยระบบ Uasb, อรุณี ศุภสินสาธิต
ก๊าซชีวภาพจากการบำบัดน้ำเสียโรงเบียร์ด้วยระบบ Uasb, อรุณี ศุภสินสาธิต
Thai Environment
No abstract provided.
อุบัติภัยในโรงงาน บทเรียนราคาแพง, นพภาพร พานิช
สัมภาษณ์พิเศษ : "นิคมอุตสาหกรรมกับสิ่งแวดล้อม" ดร.สมเจตน์ ทิณพงษ์ ผู้ว่าการการนิคมอุตสาหกรรมแห่งประเทศไทย
Thai Environment
No abstract provided.
ศักยภาพของการผลิตไฟฟ้าด้วยเชื้อเพลิงมันสำปะหลัง, สุวรรณ์ แสงเพ็ชร์
ศักยภาพของการผลิตไฟฟ้าด้วยเชื้อเพลิงมันสำปะหลัง, สุวรรณ์ แสงเพ็ชร์
Thai Environment
No abstract provided.
สารเติมแต่งน้ำมันเชื้อเพลิงชีวภาพ, มานพ พรหมสว่างศิลป์
สารเติมแต่งน้ำมันเชื้อเพลิงชีวภาพ, มานพ พรหมสว่างศิลป์
Thai Environment
No abstract provided.
แนะนำโครงการ : การศึกษาเพื่ออนุรักษ์และฟื้นฟูชายฝั่งทะเล กรณีชะอำ จังหวัดเพชรบุรี, ลือชัย ครุฑน้อย
แนะนำโครงการ : การศึกษาเพื่ออนุรักษ์และฟื้นฟูชายฝั่งทะเล กรณีชะอำ จังหวัดเพชรบุรี, ลือชัย ครุฑน้อย
Thai Environment
No abstract provided.
ศัพท์น่ารู้, พักตร์วิมล เพียรล้ำเลิศ
Mass Limit For The Standard Model Higgs Boson With The Full Lep I Aleph Data Sample, Buskulic, D.; Et Al., M. Thulasidas
Mass Limit For The Standard Model Higgs Boson With The Full Lep I Aleph Data Sample, Buskulic, D.; Et Al., M. Thulasidas
Research Collection School Of Computing and Information Systems
The reaction e+e− → HZ∗ is used to search for the standard model Higgs boson in the Hνν and the Hℓ+ℓ− channels. The data sample corresponds to about 4.5 million hadronic Z decays collected by the ALEPH experiment at LEP from 1989 to 1995 at centre-of-mass energies at and around the Z peak. Three candidate events are found in the Hμ+μ− channel, in agreement with the expected background from the electroweak process e+e− ℓ+ℓ−qq. This search results in a 95% C.L. lower limit on the Higgs boson mass of 63.9 GeV/c2.
Search For Charginos And Neutralinos With R-Parity Violation At √S = 130 And 136 Gev, Buskulic, D.; Et Al., M. Thulasidas
Search For Charginos And Neutralinos With R-Parity Violation At √S = 130 And 136 Gev, Buskulic, D.; Et Al., M. Thulasidas
Research Collection School Of Computing and Information Systems
Searches for charginos and neutralinos produced in e +e - collisions at centre-of-mass energies of 130 and 136 GeV have been performed under the assumptions that R-parity is not conserved, that the dominant R-parity violating coupling involves only leptonic fields, and that the lifetime of the lightest supersymmetric particle can be neglected. In the 5.7 pb -1 data sample collected by ALEPH, no candidate events were found. As a result, chargino and neutralino masses and couplings are constrained and the domains previously excluded at LEP1 are extended.
Strange B Baryon Production And Lifetime In Z Decays, D. Buskulic, M. Thulasidas
Strange B Baryon Production And Lifetime In Z Decays, D. Buskulic, M. Thulasidas
Research Collection School Of Computing and Information Systems
In a data sample of approximately four million hadronic Z decays recorded with the ALEPH detector from 1990 to 1995, a search for the strange b baryon Ξb is performed with a study of Ξ-lepton correlations. Forty-four events with same sign Ξ−ℓ− combinations are found whereas 8.4 are expected based on the rate of opposite sign Ξ−ℓ+ combinations. This significant excess is interpreted as evidence for Ξb semileptonic decays. The measured product branching ratio is Br(b → Ξb) × Br(Ξb→ XcXℓ−νℓ) × Br(Xc→ Ξ−X′) = (5.4±1.1(stat) ± 0.8(syst)) × 10−4 per lepton species, averaged over electrons and muons, with Xc …
An Empirical Comparison Of Area-Universal And Other Parallel Computing Networks, Ronald I. Greenberg, Lee Guan
An Empirical Comparison Of Area-Universal And Other Parallel Computing Networks, Ronald I. Greenberg, Lee Guan
Computer Science: Faculty Publications and Other Works
This paper provides empirical comparison of the communication capabilities of two area-universal networks, the fat-tree and the fat-pyramid, to the popular mesh and hypercube networks for parallel computation. While area-universal networks have been proven capable of simulating, with modest slowdown, any computation of any other network of comparable area, prior work has generally left open the question of how area-universal networks compare to other networks in practice. Comparisons are performed using techniques of throughput and latency analysis that have previously been applied to k-ary n-cube networks and using various existing models to equate the hardware cost of the networks being …
Calibration Of The Checkpoint Model To The Space And Missile Systems Center (Smc) Software Database (Swdb), Karen R. Mertes
Calibration Of The Checkpoint Model To The Space And Missile Systems Center (Smc) Software Database (Swdb), Karen R. Mertes
Theses and Dissertations
This study analyzed the effect of calibration on the performance of the CHECKPOINT Version 2.3.1 software cost estimating model. Data used for input into the model were drawn from the FY 95 USAF SMC Software Database (SWDB) Version 2.1. A comparison was made between the model's accuracy before and after calibration. This was done using records which were not used in calibration, referred to as validation points. A comparison of calibration points, both before and after, was done in order to assess whether calibration results in more consistency within the data set used. Six measures such as magnitude of relative …
An Exploration Of Environmental Technology Transition From The Laboratory To The Field, Michael A. Greiner
An Exploration Of Environmental Technology Transition From The Laboratory To The Field, Michael A. Greiner
Theses and Dissertations
Environmental policy, social factors, individual behavior, and environmental technologies are key factors in improving the current condition of the environment. The Department of Defense (DoD) is not immune to these aspects, as its actions have and will continue to impact the environment in which they conduct operations. The objective of this research is to analyze the environmental technology aspect of improving environmental conditions. Of particular interest, what barriers and bridges are encountered when an Air Force laboratory transitions environmental technologies to an end-user: operational field organization or major weapon system. The research employs a case study methodology to analyze five …