Physical Sciences and Mathematics Commons^™

The Panda Array I/O Library On The Galley Parallel File System, Joel T. Thomas

Dartmouth College Undergraduate Theses

The Panda Array I/O library, created at the University of Illinois, Urbana-Champaign, was built especially to address the needs of high-performance scientific applications. I/O has been one of the most frustrating bottlenecks to high performance for quite some time, and the Panda project is an attempt to ameliorate this problem while still providing the user with a simple, high-level interface. The Galley File System, with its hierarchical structure of files and strided requests, is another attempt at addressing the performance problem. My project was to redesign the Panda Array library for use on the Galley file system. This project involved …

Object Oriented Scenes For Virtual Light, Jonathan A. Moore

Dartmouth College Undergraduate Theses

Ray tracing is one of many way to use a computer to generate an image. Ray tracers produce images by simulating light. Eliminating the details that might distract one from the interesting parts of ray tracing algorithms was purpose of my thesis project. The software I have written can be divide into three parts: the virtual frame buffer, the support classes and the ray tracing abstract base classes. The virtual frame buffer class, vfb, provides a simple means of rendering and studying the final image produced by a graphical algorithm. The support classes provide an elegant notation for the equations …

Structural And Magnetic Studies On Prba2fe3o8, V. P.S. Awana, Latika Menon, S. K. Malik, Apurva Mehta, Sanjay Mishra, William B. Yelon

Physics Faculty Research & Creative Works

It is known that Fe moments order antiferromagnetically with Néel temperature, TN, above 700 K in RBa2Fe3O7-δ with R=Y and Eu, and Pr moments order antiferromagnetically in PrBa2Cu3,O7-δ, with TN of 17 K. We have synthesized PrBa2Fe3O8 to study the ordering of Pr and Fe moments. From X-ray and neutron diffraction studies, this compound is found to crystallize in the tetragonal structure (space group P4/mmm). 57Fe Mössbauer studies show a complex hyperfine split pattern at 77 K, but a doublet superimposed on a six-line pattern at 300 K implying that some of the Fe moments order magnetically between 77 and …

Changes In Drought Policies In New Zealand, Heather J. Keen, Lynmore Rotorua

Drought Network News (1994-2001)

New Zealand, lying in the South Pacific Ocean approximately 1,200 miles east of Australia, is subject to recurring droughts. Its two main islands are long and narrow, with high mountain ranges and hill country bisecting them from north to south. The predominant westerly winds, along with the mountain ranges and hill country, produce a marked orographic effect. Thus, the western side of the country, in general, records significantly higher annual average rainfall totals than does land on the eastern side.

The country has experienced a number of severe droughts throughout its history, especially in the east, where a number of …

Recent Advances In Seasonal Forecasting In Southern Africa, Leonard S. Uganai

Drought Network News (1994-2001)

Climatic uncertainty posed by the looming possibility of unprecedented climatic change is presenting society with new challenges the world over. In recent years, demand for long-range seasonal to interannual climate forecasts has been on the rise as society grapples with climatic risk management in southern Africa. Although more investment is still required to bring weather services in the region to a level advanced enough to handle the emerging complex and economically justified user needs for climatic services and products, some commendable progress has already been made, particularly in providing seasonal forecasts in addition to the other traditional core services and …

Water Current, Volume 28, No. 3, June 1996

Water Current Newsletter

Water Resources Tour to Explore Republican River Basin
From the Director: Summer Brings Flurry of Grant-Related Activities
Of Groundwater, Surface Water and Fish, the 94th Nebraska Legislature Adjourns
Water Rights Key Issue for Missouri Basin Tribes
Thorson Defines Challenge for Missouri River Basin
Missouri River Endangered
New Video Features Runoff Pollution
Nebraska Water News
Platte Seminar Video Tapes Available
Directory Lists Nebraska Contacts
Kuzelka Recognized For Groundwater Efforts
Three Respondents Win Water Bottles
Web Site Expanded
Wetlands Hotline Operated by EPA
Sheffield Selected to Achievement Hall
Report Examines Pesticides in Stream
31 Counites to Offer Pesticide Container Recycling

Promoting And Managing Genome Innovation, Suzanne A. Sprunger, Gianna Julian-Arnold

RISK: Health, Safety & Environment (1990-2002)

An introduction to the symposium, Promoting and Managing Genome Innovation held October 1995. The conference was organized by Professor Thomas G. Field, Jr. and Gianna Julian-Arnold. The conference was funded in part by the Ethical, Legal and Social Issues component of the D.O.E. Human Genome Program; Nixon, Hargrave, Devans & Doyle L.L.P., Rochester, N.Y.; and Human Genome Sciences.

Prismatine: Revalidation For Boron-Rich Compositions In The Kornerupine Group, Edward S. Grew, Mark A. Cooper, Frank C. Hawthorne

Earth Science Faculty Scholarship

Kornerupine and prismatine were introduced independently by Lorenzen in 1884 (but published in 1886 and 1893) and by Sauer in 1886, respectively. Ussing (1889) showed that the two minerals were sufficiently close crystallographically and chemically to be regarded as one species. However, recent analyses of boron using the ion microprobe and crystal structure refinement, indicate that the boron content of one tetrahedral site in kornerupine ranges from 0 to 1. Kornerupine and prismatine, from their respective type localities of Fiskenaesset, Greenland and Waldheim, Germany, are distinct minerals, members of an isomorphic series differing in boron content. For this reason, we …

Wright State University College Of Engineering And Computer Science Bits And Pcs Newsletter, Volume 12, Number 6, June 1996, College Of Engineering And Computer Science, Wright State University

BITs and PCs Newsletter

A ten page newsletter created by the Wright State University College of Engineering and Computer Science that addresses the current affairs of the college.

Determination Of Conditions For Oye In Which There Is No Ion Present In The Active Site, Melissa J. Morris

Honors Theses

Old Yellow Enzyme (OYE) has been the subject of extensive research since the early 1930's. However, the structure of OYE was not determined until 1994, and its physiological function still remains a mystery. Investigations into the function of OYE involve uncovering the details of protein-substrate interactions through the use of x-ray crystallography. OYE is known to oxidize NADPH, but attempts to crystallize the OYE-NADPH bound complex have been hampered by the presence of chloride in the active site of OYE. This competition prevents an accurate assessment of the structure of OYE bound to NADPH. This study will examine the possibility …

Nutrient Changes In The Mississippi River And System Responses On The Adjacent Continental Shelf, Nancy N. Rabalais, R. Eugene Turner, Dubravko Justic, Quay Dortch, William J. Wiseman, Barun Sen Gupta

Faculty Publications

The Mississippi River system ranks among the world's top 10 rivers in freshwater and sediment inputs to the coastal ocean. The river contributes 90% of the freshwater loading to the Gulf of Mexico, and terminates amidst one of the United States' most productive fisheries regions and the location of the largest zone of hypoxia, in the western Atlantic Ocean. Significant increases in riverine nutrient concentrations and loadings of nitrate and phosphorus and decreases in silicate have occurred this century, and have accelerated since 1950. Consequently, major alterations have occurred in the probable nutrient limitation and overall stoichiometric nutrient balance in …

Controlling Experiment-Wise Type I Error Of Meta-Analysis In The Solomon Four-Group Design, Shlomo S. Sawilowsky

Theoretical and Behavioral Foundations of Education Faculty Publications

Abstract. Stouffer=s Z, a meta-analytic technique, was proposed by W. Braver and Braver (1988) for analyzing data collected from a Solomon Four-group Design. Sawilowsky, Kelley, Blair, and Markman (1994) showed that this technique produces inflated Type I error rates. Recommendations are made to control the false positive inflation of their procedure.

On The Benefit Of Supporting Virtual Channels In Wormhole Routers, Richard Cole, Bruce Maggs, Ramesh Sitaraman

Ramesh Sitaraman

This paper analyzes the impact of virtual channels on the performance of wormhole routing algorithms. We study wormhole routing on network in which each physical channel, i.e., communication link, can support up to B virtual channels. We show that it is possible to route any set of messages with L flits each, whose paths have congestion C and dilation D in O((L+ D) C(D log D)1_B_B) flit steps, where a flit step is the time taken to transmit B flits, i.e., one flit per virtual channel, across a physical channel. We also prove a nearly matching lower bound; i.e., for …

Emisja Chlorowodoru I Związków Fluoru Ze Spalania Odpadów Niebezpiecznych, Marian Mazur, Robert Oleniacz, Marek Bogacki

Robert Oleniacz

The paper presents the results of measurements of the concentration of hydrogen chloride (HCl) and fluoride compounds (as HF) in raw and purified combustion gases discharged from the incineration of selected hazardous wastes. The study included two installations operating on an industrial scale: a multiple hearth furnace and a rotary kiln incinerator equipped with a single wet flue gas cleaning systems. In the multiple hearth furnace was being incinerated sludge from coke industry. In the rotary kiln were being incinerated coal (coke) tars, contaminated cleaning rags, sawdust, used gloves, outdated pharmaceuticals and medicines, hospital waste, waste paints, varnish and lubricant, …

Построение Редуцированного Физического Гамильтониана Для Сферически-Симметричной Гравитации, Николай Заркевич

Nikolai A. Zarkevich

No abstract provided.

51. Ephraim Katchaski-Katzir, Otto Vogl, Joseph Jagur-Grodzinski

Otto Vogl

No abstract provided.

Characters Of The Centralizer Algebras Of Mixed Tensor Representations Of Gl(R,C) And The Quantum Group U-Q(Gl(R,C)), Thomas Halverson

Thomas M. Halverson

No abstract provided.

A Mathematician Among The Molasses Barrels: Maclaurin's Unpublished Memoir On Volumes, Judith V. Grabiner

Pitzer Faculty Publications and Research

Suppose we are given a solid of revolution generated by a conic section. Slice out a frustum of the solid [14, diagrams pp. 77, 80]. Then, construct a cylinder, with the same height as the frustum, whose diameter coincides with the diameter of the frustum at the midpoint of its height. What is the difference between the volume of the frustum and the volume of this cylinder? Does this difference depend on where in the solid the frustum is taken?

The beautiful theorems which answer these questions first appear in a 1735 manuscript by Colin Maclaurin (1698–1746). This …

The Probe, Issue 166 – June 1996

The Probe: Newsletter of the National Animal Damage Control Association

Why NADCA? One Region Director's Opinion Peter H. Butchko, NADCA Region 9 Director,
The Turtle and the Hare (Wildlife Damage Version), by Robert H. Schmidt
Point of View: Mad Cow Disease
Dolomitic Hydrated Lime Feeding Deterrent to Birds
Booklet Review: A Homeowners Guide to North Eastern Bats and Bat Problems. By Lisa M. Williams-Whitmer and Margaret C. Brittingham. August, 1995 Penn State University. Pp. 1-22.

Wheels On Wheels On Wheels-Surprising Symmetry, Frank A. Farris

Mathematics and Computer Science

While designing a computer laboratory exercise for my calculus students, I happened to sketch the curve defined by this vector equation: (x, y) = (cos(t), sin(t)) + 1/2(cos(7t), sin(7t)) + 1/3(sin(17t), cos(17t)). I was thinking of the curve traced by a particle on a wheel mounted on a wheel mounted on a wheel, each turning at a different rate. The first term represents the largest wheel, of radius 1, turning counter-clockwise at one radian per second. The second term represents a smaller wheel centered at the edge of the first, turning 7 times as fast. The third term is for …

Charge Collection And Trapping In Low‐Temperature Silicon Detectors, M. J. Penn, Brian L. Dougherty, Blas Cabrera, R. M. Clarke, Betty A. Young

Physics

Charge collection efficiency measurements in silicon detectors at low temperature (T < 0.5 K) and low applied electric field (E=0.1–100 V/cm) were performed using a variety of high‐purity, p‐type silicon samples with room‐temperature resistivity in the range 2–40 kΩ cm. Good charge collection under these conditions of low temperature and low electric field is necessary for background suppression, through the simultaneous measurement of phonons and ionization, in a very low event rate dark matter search or neutrino physics experiment. Charge loss due to trapping during drift is present in some samples, but the data suggest that another charge–loss mechanism is also important. We present results which indicate that, for 60 keV energy depositions, a significant fraction of the total charge loss by trapping occurs in the initial electron‐hole cloud near the event location which may briefly act as a shielded, field‐free region. In addition, measurements of the lateral size, transverse to the applied electric field, of the initial electron‐hole cloud indicate large transverse diffusion lengths. At the lowest fields a lateral diameter on the order of 1 mm is found in a detector ∼5 mm thick.

Flare Energetics: Analysis Of A Large Flare On Yz Canis Minoris Observed Simultaneously In The Ultraviolet, Optical And Radio., G. H. J. Van Den Oord, John G. Doyle, M. Rodono, D. E. Gary, Gregory W. Henry, Patrick B. Byrne, Jeffrey L. Linsky

Information Systems and Engineering Management Research Publications

The results of coordinated observations of the dMe star YZ CMi at optical, UV and radio wavelengths during 3-7 February 1983 are presented. YZ CMi showed repeated optical flaring with the largest flare having a magnitude of 3.8 in the U-band. This flare coincided with an IUE exposure which permits a comparison of the emission measure curves of YZ CMi in its flaring and quiescent state. During the flare a downward shift of the transition zone is observed while the radiative losses in the range 10^4^-10^7^K strongly increase. The optical flare is accompanied with a radio flare at 6cm, while …

Automatic Identification Of Icosahedral Virus Particles In Electron Micrographs, Ioana Maria Martin, Dan C. Marinescu

Department of Computer Science Technical Reports

No abstract provided.

What Is An Answer? An Essay On The Theory Of Functions, John R. Rice

Department of Computer Science Technical Reports

No abstract provided.

The Clam Approach To Multithreaded Communication On Shared-Memory Multiprocessors: Design And Experiments, Joan Carlos Gomez, Edward Mascarenhas, Vernon J. Rego

Department of Computer Science Technical Reports

No abstract provided.

Reducing Intermediate Results For Incremental Updates Of Materialized Views, Tetsuya Furukawa, Ahmed K. Elmagarmid

Department of Computer Science Technical Reports

No abstract provided.

Object Based Constraint Management For Collaborative Systems, Chandrajit Bajaj, Peinan Zhang

Department of Computer Science Technical Reports

No abstract provided.

On Mobile Systems And Disconnected Browsing Of Distributed Information, Anupam Joshi, Sanjiva Weerawarana, Elias N. Houstis

Department of Computer Science Technical Reports

No abstract provided.

Observation Of A Large Parity Nonconserving Analyzing Power In Xe, J J. Szymanski, W M. Snow, J D. Bowman, B Cain, Bret E. Crawford, P P J. Delheij, R D. Hartman, T Haseyama, C D. Keith, J N. Knudsen, A Komives, M Leuschner, L Y. Lowie, A Masaike, Y Matsuda, G E. Mitchell, S I. Penttila, H Postma, D Rich, N R. Roberson, S J. Seestrom, E I. Sharapov, Sharon L. Stephenson, Y-F Yen, V W. Yuan

Physics and Astronomy Faculty Publications

A large parity nonconserving longitudinal analyzing power was discovered in polarized-neutron transmission through Xe. An analyzing power of 4.3±0.2% was observed in a p-wave resonance at E_n=3.2 eV. The measurement was performed with a liquid Xe target of natural isotopic abundance that was placed in the polarized epithermal neutron beam, flight path 2, at the Manuel Lujan Neutron Science Center. This apparatus was constructed by the TRIPLE Collaboration, and has been used for studies of parity symmetry in compound nuclear resonances. Part of the motivation of the experiment was to discover a nucleus appropriate for a sensitive test …

Mapped Karst Ground-Water Basins In The Lexington 30 X 60 Minute Quadrangle, James C. Currens, Joseph A. Ray

Map and Chart--KGS

No abstract provided.