Digital Commons Network^™

Two Cubesats With Micro-Propulsion In The Qb50 Satellite Network, P.P. Sundaramoorthy, E. Gill, C.J.M. Verhoeven, J. Bouwmeester

Small Satellite Conference

A network of small low-cost satellites is the only realistic option for multi-point in-situ measurements in the lower thermosphere. The QB50 program, an initiative of the von Karman Institute of Fluid Dynamics (VKI), aims to employ a network of 50 CubeSats built by universities to study the lower thermosphere (90-320 km). All 50 CubeSats will carry identical sensors and will be launched together from a single launch vehicle. QB50 will also study the re-entry process by measuring a number of critical parameters during re-entry. The Delft University of Technology (TUDelft) intends to provide two satellites out of the 50 CubeSats …

G-Lattices For An Unrooted Perfect Phylogeny, Monica Grigg

Mathematical Sciences Technical Reports (MSTR)

We look at the Pure Parsimony problem and the Perfect Phylogeny Haplotyping problem. From the Pure Parsimony problem we consider structures of genotypes called g-lattices. These structures either provide solutions or give bounds to the pure parsimony problem. In particular, we investigate which of these structures supports an unrooted perfect phylogeny, a condition that adds biological interpretation. By understanding which g-lattices support an unrooted perfect phylogeny, we connect two of the standard biological inference rules used to recreate how genetic diversity propagates across generations.

A Perturbation Method For Inference On Regularized Regression Estimates, Jessica Minnier, Lu Tian, Tianxi Cai

Harvard University Biostatistics Working Paper Series

No abstract provided.

Sumpter, Ward Cullin, 1902-1977 (Sc 2318), Manuscripts & Folklife Archives

Manuscript Collection Finding Aids

Finding aid only for Manuscripts Small Collection 2318. Chemistry notebook of Ward Cullin Sumpter, probably kept about 1930 while he was a doctoral student at Yale University. Includes other miscellaneous documents: a tribute to a church's departing pastor, a draft petition in support of an anti-cigarette law, and a poem relating to the 1928 presidential election.

Interview With Brandon Hill, Bamboo Sushi, 2010 (Audio), Brandon Hill

All Sustainability History Project Oral Histories

Interview of Brandon Hill by Jeff Francoeur at Bamboo Sushi, SE Portland, Oregon on August 10, 2010.

The interview index is available for download.

Temperature And Variability Of Three Ionian Volcanoes, Daniel R. Allen

Theses and Dissertations

Cassini spacecraft images of Io obtained during its flyby of Jupiter in late 2000 and early 2001 were used to determine the lava composition and eruption style of three faint hotspots, Pillan, Wayland, and Loki. We found a maximum color temperature of 1130+/-289 K for Pillan and maximum color temperatures of 1297+/-289 K and 1387+/-287 K for Wayland and Loki, respectively. These temperatures are suggestive of basaltic lava. The temperatures with the best signal-to-noise ratios also suggested basaltic lava and were found to be 780+/-189 K, 1116+/-250 K, and 1017+/-177 K for Pillan, Wayland, and Loki, respectively. Pillan showed increased …

Guest Induced Transformations Of Assembled Pyridyl Bis-Urea Macrocycles, Kinkini Roy, Chun Wang, Mark D. Smith, Mahender B. Dewal, Arief C. Wibowo, Julius C. Brown, Shugo Ma, Linda S. Shimizu

Faculty Publications

Pyridine macrocycles with no cavities assembled into close packed columns yet absorbed guests including hydrogen, carbon dioxide, and iodine.

Interactive Object Selection And Matting For Video And Images, Brian L. Price

Theses and Dissertations

Video segmentation, the process of selecting an object out of a video sequence, is a fundamentally important process for video editing and special effects. However, it remains an unsolved problem due to many difficulties such as large or rapid motions, motion blur, lighting and shadow changes, complex textures, similar colors in the foreground and background, and many others. While the human vision system relies on multiple visual cues and higher-order understanding of the objects involved in order to perceive the segmentation, current algorithms usually depend on a small amount of information to assist a user in selecting a desired object. …

Absorption Of The Ω And Φ Mesons In Nuclei, M. Wood, Gerard P. Gilfoyle, Et. Al.

Physics Faculty Publications

Because of their long lifetimes, the ω and φ mesons are the ideal candidates for the study of possible modifications of the in-medium meson-nucleon interaction through their absorption inside the nucleus. During the E01-112 experiment at the Thomas Jefferson National Accelerator Facility, the mesons were photoproduced from ²H, C, Ti, Fe, and Pb targets. This Letter reports the first measurement of the ratio of nuclear transparencies for the e⁺e^- channel. The ratios indicate larger in-medium widths compared with what have been reported in other reaction channels. The absorption of the ω meson is stronger than that …

Incorporating Genomics And Bioinformatics Across The Life Sciences Curriculum, Jayna L. Ditty, Christopher A. Kvaal, Brad Goodner, Sharyn K. Freyermuth, Cheryl Bailey, Robert A. Britton, Stuart G. Gordon, Sabine Heinhorst, Kelyenne Reed, Zhaohui Xu, Erin R. Sanders-Lorenz, Seth Axen, Edwin Kim, Mitrick Johns, Kathleen Scott, Cheryl A. Kerfeld

Faculty Publications

No abstract provided.

Aspergillus Fumigatus Sida Is A Highly Specific Ornithine Hydroxylase With Bound Flavin Cofactor, Samuel W. Chocklett, Pablo Sobrado

Chemistry Faculty Research & Creative Works

Ferrichrome is a hydroxamate-containing siderophore produced by the pathogenic fungus Aspergillus fumigatus under iron-limiting conditions. This siderophore contains N5-hydroxylated l-ornithines essential for iron binding. A. fumigatus siderophore A (Af SidA) catalyzes the flavin- and NADPH-dependent hydroxylation of l-ornithine in ferrichrome biosynthesis. Af SidA was recombinantly expressed and purified as a soluble tetramer and is the first member of this class of flavin monooxygenases to be isolated with a bound flavin cofactor. The enzyme showed typical saturation kinetics with respect to l-ornithine while substrate inhibition was observed at high concentrations of NADPH and NADH. Increasing amounts of hydrogen peroxide were measured …

Spectral Imaging Payload For Nanosatellite Earth Observation, Brian Solheim, Hugh Chesser, Regina Lee, Kenneth Sinclair, Guy Benari

Small Satellite Conference

The concept of a novel spectrometer suitable for integration into a nanosatellite is presented. Thesespectrometers offer high resolution, increased throughput (étendue) and no moving parts. A lab prototypeof the spectrometer design has been built to characterize the ability of the new slab waveguide technologyfor application in remote sensing instruments aboard nanosatellite platforms. The spectrometer will have anadir view to detect the 1.6665mm waveband allowing global total column measurements of methane.Aspects of the instrument design important for integration into the planned YUsend-2 nanosatelliteplatform are presented. Focus is given to derivation of instrument requirements such as operationaltemperature range which constrain the nanosatellite …

The Cubesat Heliospheric Imaging Experiment (Chime), Craig Deforest, John Dickinson, Juan Aguayo, John Andrews, Michael Epperly, Tim Howard, Joe Peterson, Jennifer Alvarez, Michael Pilcher, Craig Kief, Steve Suddarth, James Tappin

Small Satellite Conference

We describe a CubeSat mission to predict and diagnose space weather events at Earth by tracking the interplanetary disturbances that cause those effects. Our demonstration mission, the CubeSat Heliospheric Imaging Experiment (CHIME), is a wide-field sky camera that can image large, tenuous clouds of material as they cross the inner solar system en-route to Earth. These clouds, such as interplanetary coronal mass ejections (ICMEs), are produced by magnetic activity on the surface of the Sun, and consist of billions of tons of magnetized plasma that streak across the solar system at up to 8 million km/hour. Impact of ICMEs on …

Paradigm Educational Materialist For The Pedagogy Of The 21st Century, Roberto Enrique Villaseca Muñoz Phd Candidate, Academic Director

Fostering Multicultural Competence and Global Justice: an SIT Symposium

Since the second half of the twentieth century, postmodern theories of discourse and language ideology has seized the collective imagination of society and education, mainly through the curriculum, pedagogical models, constructivism and the massmedia. In Higher Education, these are accentuated after the eighties, which contributed to sacrifice the materialistic ideas and the postmodern position within a framework of irrefutable ideological bias. The market economy of neoliberal ideology spreads a unique style of absolute truth, education paradigms of language and discourse that dislocates and deconstructs reality, articulated with the massmedia, encourages alienation. Neoliberalism destroys the environment and deepends social inequalities. These …

The Anatomy Of Conflict, Lahcen Haddad Phd, Academic Director

Fostering Multicultural Competence and Global Justice: an SIT Symposium

The need for peace in today’s world has become an existential issue for humanity. Without a sense of shared earth and its resources and a shared humanity governed by universal and local values, the human race seems to be more threatened with a crippling propensity for self-destruction than ever before. Some theories, systems of thought even religious currents like Marxism, fascism, jihadi Islam, crusading Christianity, expansionist Zionism think that conflict is fundamental to History inasmuch as it allows for justification of the self through the use of power. For Marxism, struggle as conflict between classes is the engine that drives …

Overview Of Learning Theories (Chapter 1 Of Faith-Based Education That Constructs), Debra S. Espinor

Faculty Publications - College of Education

Virtually everyone would agree that the role of the school is to help students learn. The school, as an institution of education, must incorporate a sense of morality or values. This said, the methods of incorporating morality and values into education vary. This chapter explores three of the most common learning theories of the last fifty years: behaviorism, cognitivism, and constructivism. Each section will take a brief glance at the history, background, and definition of each of the theories. Then, the chapter will turn to the strengths and weaknesses of each of the theories, illuminating their role in supporting students' …

Performance Analysis Of Secure Hierarchical Data Aggregation In Wireless Sensor Networks, Vimal Kumar, Sanjay Madria

Computer Science Faculty Research & Creative Works

Data aggregation is a technique used to conserve battery power in wireless sensor networks (WSN). While providing security in such a scenario it is also important that we minimize the number of security operations as they are computationally expensive, without compromising on the security. in this paper we evaluate the performance of such an end-to-end security algorithm. We provide our results from the implementation of the algorithm on mica2 motes and conclude how it is better than traditional hop by hop security. © 2010 IEEE.

A Communication Efficient Framework For Finding Outliers In Wireless Sensor Networks, Dylan Mcdonald, Stewart Sanchez, Sanjay Kumar Madria, Fikret Ercal

Computer Science Faculty Research & Creative Works

Outlier detection is a well-studied problem in various fields. the unique challenges of wireless sensor networks make this problem especially challenging. Sensors can detect outliers for a plethora of reasons and these reasons need to be inferred in real time. Here, we present a new communication technique to find outliers in a wireless sensor network. Communication is minimized through controlling sensor when sensors are allowed to communicate. at the same time, minimal assumptions are made about the nature of the data set as to minimize the loss of generality in the architecture. © 2010 IEEE.

Pairing Educational Robotics With Geospatial Technologies In Informal Learning Environments, Bradley Barker, Neal Grandgenett, Gwen Nugent, Viacheslav Adamchuk

Journal of Youth Development

Educational robotics, when paired with geospatial technologies and taught in an informal educational environment, can be an innovative strategy to teach youth about science, technology, engineering, and mathematic (STEM) concepts. However, little is known about the true effects on conceptual knowledge and associated attitudes. Therefore, this study was conducted to examine the short- term effects of a series of five-day summer robotics/geospatial camps held in Nebraska. The study was conducted at six diverse locations and consisted of a five-day 4-H camp experience. The study examined the experiences of 147 youth between the ages of 10 and 15. A pretest- posttest …

Board Of Directors Meeting Minutes (August 9, 2010), Dmacc

Board of Directors Meeting Minutes

This file contains the minutes from the Des Moines Area Community College Board meeting held on August 9, 2010.

Improving Undergraduate Education In Psychology Using An End-Of-Major Standardized Assessment And A Teaching Resources Wiki, David L. Mason

Theses and Dissertations

Traditionally, appeals for improving the teaching of psychology at the post-secondary level have focused on increasing teacher training and motivation. However, wide-scale success may be limited because both approaches involve significant demands on teachers' time. I describe two recommendations that may improve teaching while requiring minimal time investment from individual teachers. The first is the development of an end-of-major assessment taken by undergraduate psychology majors that would provide valuable feedback to teachers on which areas of the curriculum need improvement. The second recommendation is to create a new database of research on teaching and learning that focuses on streamlining relevant …

Chain-Selective And Regioselective Ethylene And Styrene Dimerization Reactions Catalyzed By A Well-Defined Cationic Ruthenium-Hydride Complex: New Insights On The Styrene Dimerization Mechanism, Do W. Lee, Chae S. Yi

Chemistry Faculty Research and Publications

The cationic ruthenium hydride complex [(η⁶-C₆H₆)(PCy₃)(CO)RuH]⁺BF₄⁻ was found to be a highly regioselective catalyst for the ethylene dimerization reaction to give 2-butene products (TOF = 1910 h⁻¹, >95% selectivity for 2-butenes). The dimerization of styrene exclusively produced the head-to-tail dimer (E)-PhCH(CH₃)CH═CHPh at an initial turnover rate of 2300 h⁻¹. A rapid and extensive H/D exchange between the vinyl hydrogens of styrene-d₈ and 4-methoxystyrene was observed within 10 min without forming the dimer products at room temperature. The inverse …

In Vivo Measurement Of Rat Skeletal Muscle Oxygen Consumption Following Brief Periods Of Ischemia With Reperfusion As Assessed By Phosphorescence Quenching Microscopy, William Nugent

Theses and Dissertations

Brief periods of skeletal muscle ischemia (ischemic pre-conditioning) alter cellular metabolism in a way that confers protection over subsequent ischemic episodes. The mechanisms behind this effect have been studied indirectly through assays for the byproducts of ATP synthesis and in vitro studies of cellular signaling cascades and ROS generation. There have been no direct, in vivo assessments of the changes in respiration during reperfusion. We employed phosphorescence quenching microscopy in conjunction with a flow-arrest technique to assess the influences of external, pressure-induced 1- to 10-min focal ischemia on interstitial oxygenation (PISFO2) and the consumption of oxygen (VO2) in spinotrapezius muscles …

Efficient Simulation Architecture For Routing And Replication In Mobile Peer To Peer Network Of Uavs, Hemanth Meka, Sanjay Kumar Madria, Mohan Kumar, Mark Linderman, Sharma Chakravarthy

Computer Science Faculty Research & Creative Works

Most of the routing and replication algorithms assume the network to be large and therefore, the architecture and algorithms are designed to be scalable. These algorithms however may not perform well with limited number of nodes in a network of UAVs. It is better to design and simulate such algorithms to increase the efficiency in a small network as scalability is no longer an issue. for such networks, we present design and simulation of some effective routing and replication algorithms to route packets, disseminate information, and replicate data among nodes. © 2010 IEEE.

Real-Time Data Compression In Wireless Sensor Networks, Tommy Szalapski, Sanjay Madria

Computer Science Faculty Research & Creative Works

Wireless sensor networks possess significant limitations in storage, bandwidth, and power. Additionally, real-time sensor networks cannot tolerate high latency. While some good compression algorithms exist specific to sensor networks, there remains a need for methods that do not introduce additional latency. This paper introduces a compression scheme which reduces storage, bandwidth, and power while also minimizing latency. Our Huffman style compression scheme exploits temporal locality and delta compression to provide better bandwidth utilization, thus reducing latency for real time applications. © 2010 IEEE.

Defending Wireless Sensor Networks Against Adversarial Localization, Neelanjana Dutta, Abhinav Saxena, Sriram Chellappan

Computer Science Faculty Research & Creative Works

In this paper, we study the issue of defending against adversarial localization in wireless sensor networks. Adversarial localization refers to attacks where an adversary attempts to disclose physical locations of sensors in the network. the adversary accomplishes this by physically moving in the network while eavesdropping on communication messages exchanged by sensors and measuring raw physical properties of messages like Angle of Arrival, Signal Strength of the detected signal. in this paper, we aim to defend sensor networks against such kinds of adversarial localization. the core challenge comes from the sensors performing two conflicting objectives simultaneously: localize the adversary and …

Dynamic Social Grouping Based Routing In A Mobile Ad-Hoc Network, Roy Cabaniss, Sanjay Madria, George Rush, Abbey Trottay, Srinivasa S. Vulli

Computer Science Faculty Research & Creative Works

The patterns of movement used by Mobile Ad-Hoc networks are application specific, in the sense that networks use nodes which travel in different paths. When these nodes are used in experiments involving social patterns, such as wildlife tracking, algorithms which detect and use these patterns can be used to improve routing efficiency. the intent of this paper is to introduce a routing algorithm which forms a series of social groups which accurately indicate a node's regular contact patterns while dynamically shifting to represent changes to the social environment. With the social groups formed, a probabilistic routing schema is used to …

Arterial Waveform Measurement Using A Piezoelectric Sensor, Ruizhi Zhang

Theses and Dissertations

This study aims to develop a new method to monitor peripheral arterial pulse using a PVDF piezoelectric sensor. After comparing different locations of sensor placement, a specific sensor wrap for the finger was developed. Its composition, size, and location make it inexpensive and very convenient to use. In order to monitor the effectiveness of the sensor at producing a reliable pulse waveform, a monitoring system, including the PZT sensor, ECG, pulse-oximeter, respiratory sensor, and accelerometer was setup. Signal analysis from the system helped discover that the PZT waveform is relative to the 1st derivative of the artery pressure wave. Also, …

Macalester Professor Awarded $1.2m Nsf Grant To Study Tags - Grant Split Between Macalester And University Of Minnesota, Macalester College

College Press Releases

No abstract provided.

Web 2.0 Technologies Within A Higher Education Online Database Practicum Supporting A New Collaborated Methodology, Sandra Blackman

Regis University Student Publications (comprehensive collection)

Since the introduction of Web 2.0 technologies in 2004, computer based communication has evolved adding a new dimension to formal and informal knowledge sharing. Focusing on Web 2.0 technologies Facebook and Twitter, this case study researches the use of these tools to enhance a higher education online database practicum environment. This paper presents practical methodologies that can be used to incorporate Web 2.0 technologies to support knowledge sharing in a distance learning database practicum.