Digital Commons Network^™

Cubesec And Gndsec: A Lightweight Security Solution For Cubesat Communications, Obulapathi Challa, Gokul Bhat, Janise Mcnair

Small Satellite Conference

Communication protocols implemented for CubeSat networks have trivial overhead and almost no security features. As CubeSats are heavily constrained for resources, complex security suites and protocols can seldom be implemented. Cyclic Redundancy Check (CRC) which is currently used in CubeSats provides no protection against intentional corruption of data and moreover, CubeSats are vulnerable to eavesdropping due to the wireless channel. Message integrity also becomes questionable as an attacker can modify commands and data. This paper proposes CubeSec and GndSec, a very light-weight security solution for CubeSats communications. CubeSec and GndSec provides mutual authentication, confidentiality, data integrity between Cubesat and ground …

Edde: A Multi-Km Modular Upper Stage For Smallsats, Joseph Carroll, Jerome Pearson

Small Satellite Conference

"EDDE" (the ElectroDynamic Delivery Express) is a persistently maneuverable modular propellant-less vehicle for low earth orbit (LEO). EDDE has at least 2 major applications: payload delivery and debris removal. Vehicles as light as 20-30 kg can deliver secondary payloads to custom orbits, but 50-100 kg vehicles plus capture hardware are needed to efficiently remove orbital debris above 800 km. EDDE uses a reinforced aluminum foil tape to collect and conduct electrons, and solar arrays distributed along the length to limit peak local voltages. Hot tungsten wires emit electrons back into the ambient plasma. Air drag sets EDDE's minimum altitude of …

Additively Manufactured Propulsion System, Matthew Dushku, Paul Mueller

Small Satellite Conference

New high-performance, carbon-fiber reinforced polymer material allows additive manufacturing to produce pressure vessels capable of high pressures (thousands of pounds per square inch). This advancement in turn allows integral hybrid propulsion which is revolutionary for both CubeSats and additively-manufactured spacecraft. Hybrid propulsion offers simplicity as compared to bipropellant liquid propulsion, significantly better safety compared to solid or monopropellant hydrazine propulsion, and much better performance than cold-gas or hydrogen peroxide monopropellant propulsion. The safety benefits are especially important for CubeSats because they are generally secondary payloads whose impact on primary payload operations must be minimized. The possibility of safe, highperformance, high …

Maximum Power Point Tracking Techniques For Efficient Photovoltaic Microsatellite Power Supply System, Hadi Malek, Sara Dadras, Yangquan Chen, Robert Burt, James Cook

Small Satellite Conference

Due to limited power availability and constraints imposed on satellite mass, volume, and available area for photovoltaic (PV) panels, high power conversion efficiency is an important goal in the design process of an electrical power source for microsatellites. In this research, we model, design, and build a photovoltaic based Electrical Power System (EPS) for a satellite to ensure the supply of maximum power and stable operation. This paper presents the results of our MPPT (maximum power point tracking) research. We describe the EPS power system boundary requirements used in our research. We also describe the design constraints used in our …

Measurements Of Ice Nucleation By Mineral Dusts In The Contact Mode, Kristopher W. Bunker, Swarup China, C. Mazzoleni, A. B. Kostinski, Will Cantrell

Department of Physics Publications

Formation of ice in Earth's atmosphere at temperatures above approximately −20 °C is one of the outstanding problems in cloud physics. Contact nucleation has been suggested as a possible mechanism for freezing at relatively high temperatures; some laboratory experiments have shown contact freezing activity at temperatures as high as −4 °C. We have investigated Arizona Test Dust and kaolinite as contact nuclei as a function of size and temperature and find that the fraction of submicron particles that are active as contact ice nuclei is less than 10−3 for −18 °C and greater. We also find that the different dusts …

Fluid Scrubber And Spray Booth Including The Fluid Scrubber, Abraham J. Salazar

Mechanical Engineering Faculty Patents

A wet scrubber for scrubbing a fluid. The wet scrubber may include an inlet for receiving the fluid and a vortex chamber, in communication with the inlet, for causing at least a portion of the fluid to circulate. The wet scrubber may also include at least one diffuser for exhausting the fluid from the vortex chamber, the diffuser configured to substantially prevent fluid exhausted from the diffuser from recirculating back into the diffuser. A paint booth and a method of scrubbing a fluid are also provided.

The Effect Of A Factor Price Change On The Excess Demand Of Market And The Number Of Firms, Paul Kim

Economics Papers and Presentations

The effect of a factor price change on the long-run cost curves of a perfectly competitive firm has been formerly examined. It has been assumed in the above analysis that output price adjusts instantaneously to the new minimum average cost of the firm after a change in a factor price. Based upon the above assumption, on which a disequilibrium situation of the market can be visualized, the effect of a factor price change on the number of the firms in the industry has also been discussed. However, the above discussion of the effect of a factor price change on the …

Research Studies In Higher Education: Educating Multicultural College Students-Ch 9, J M. Harpe, Theodore Kaniuka

Faculty Working Papers from the School of Education

Book Chapter

Welcome Week 2012 Promises Fun For Everyone, Winthrop University

Winthrop News 2012

• The eight-day series of events will run Aug. 17-26.
• Welcome Week 2012 kicks off Aug. 17 with Playfair, a session of icebreakers, games and presentations.
• Events are free with the purchase of a DSU Welcome Week pass.

Brainstorm: Head Injuries And The Nfl, Part 5: On The Matter Of Damaging Neural Circuits, John J. Medina Ph.D.

Brainstorm

In the last installment, we examined the forces capable of causing brain injury, but left out the most important question: What happens to brain tissues unlucky enough to experience those forces? Now it is time to face the biological facts. In this installment, we will talk about neurological tissue and closed-­head injuries.

08-14-2012 Tickets For Big Bang Theory Tv Star's Appearance At Swosu Go On Sale August 20, Southwestern Oklahoma State University

THE BARK ARCHIVE 2012

Tickets go on sale Monday, August 20, for the first Panorama event featuring Kunal Nayyar from The Big Bang Theory TV show. Nayyar, know as“Raj Koothrappali”on the show, will be at Southwestern Oklahoma State University in Weatherford on Thursday, September 20.

The Minutes Of The Marshall University Board Of Governors Meeting, August 14, 2012, Marshall University Board Of Governors

Board of Governors Minutes

No abstract provided.

2013 Cohort Senior Project, University Of Dayton

Blog Archive: River Reflections at the University of Dayton

Video of the 2013 Cohort Senior Project

Ndls Update 08/14/2012, Notre Dame Law School

NDLS Update

No abstract provided.

Research Studies In Higher Education: Educating Multicultural College Students-Ch 1, Desireé Vega, James L. Moore

Faculty Working Papers from the School of Education

Book Chapter

Research Studies In Higher Education: Educating Multicultural College Students-Ch 6, Ashley Rondini

Faculty Working Papers from the School of Education

Book Chapter

August 4, 2012, Civil Service Council

2012

No abstract provided.

August 14, 2012, Communication Disorders & Sciences

Faculty Meeting Minutes & Agendas

Meeting minutes of the August 14, 2012 Faculty Committee meeting.

The Child And Adult Care Food Program And Food Insecurity, Colleen Heflin, Irma Arteaga, Sara Gable

University of Kentucky Center for Poverty Research Discussion Paper Series

High rates of food insecurity are a significant problem in the United States. It is currently estimated that more than 48.8 million people live in food insecure households, meaning that at some time during the previous year, they were unable to acquire or were uncertain of having enough food to meet basic needs due to inadequate household resources (Coleman-Jensen, Nord, Andrews, & Carlson, 2011). Rates of food insecurity are substantially higher among those in households with incomes below the poverty line (40.2%) and in households with children headed by a single woman (35.1%). Levels of food insecurity increased across U.S. …

Miller, Harold Asher, B. 1939 (Sc 2564), Manuscripts & Folklife Archives

Manuscript Collection Finding Aids

Finding aid and scan (Click on "Additional Files" below) for Manuscripts Small Collection 2564. Letter of Harold A. Miller, Mayor of Bowling Green, Kentucky, to Frances Jones Mills, Kentucky Secretary of State, providing statutorily required information about the City of Bowling Green, namely its incorporation date (1812), its present classification as a Second Class city, and its present boundaries (detailed on a map which is not included). The date of incorporation presumably references Laws of Kentucky 1811, ch. 308 (approved 6 January 1812), which directed the town’s free white male inhabitants to assemble on the first Saturday in May 1812 …

Ross V. Dorsey Clerk's Record V. 1 Dckt. 39152

Idaho Supreme Court Records & Briefs, All

No abstract provided.

Cpd Faculty Fellow Damon Cann Is A Usu Researcher Of The Year, Center For Persons With Disabilities

Blog Posts

No abstract provided.

08/14/2012 Obituary Records, Hawaii Obituaries

Obituaries

List of Obituaries for individuals who passed away on 08/14/2012. Scroll down to see the names and obituary description.

Blog Post, Maps (In All Caps) Part Ii, 'Burg Blogs, August 14, 2012, Zach Westmark

USF St. Petersburg Campus News and Press Releases

No abstract provided.

Objections To The Proposed Access Copyright Post-Secondary Tariff And Its Progeny Licenses: A Working Paper, Samuel Trosow, Scott Armstrong, Brent Harasym

FIMS Publications

On March 31, 2010, Access Copyright applied to the Copyright Board to certify a tariff that would govern the relationship between the organization and the members of the Association of Universities and Colleges of Canada (AUCC) and the Association of Community Colleges of Canada (ACCC). Previously, the relationship had been governed by a series of license agreements between the organizations which had been periodically renewed. But Access Copyright chose not to seek renewal of the licenses, and applied to the Board to certify a general tariff that would cover all post-secondary institutions for the period of 2011 through 2013.

Access …

The Structural Stability Of The Endothelial Glycocalyx After Enzymatic Removal Of Glycosaminoglycans, Ye Zeng, Eno E. Ebong, Bingmei M. Fu, John M. Tarbell

Publications and Research

Rationale It is widely believed that glycosaminoglycans (GAGs) and bound plasma proteins form an interconnected gel-like structure on the surface of endothelial cells (the endothelial glycocalyx layer–EGL) that is stabilized by the interaction of its components. However, the structural organization of GAGs and proteins and the contribution of individual components to the stability of the EGL are largely unknown. Objective To evaluate the hypothesis that the interconnected gel-like glycocalyx would collapse when individual GAG components were almost completely removed by a specific enzyme. Methods and Results Using confocal microscopy, we observed that the coverage and thickness of heparan sulfate (HS), …

Research Studies In Higher Education: Educating Multicultural College Students-Ch 2, Pamela A. Larde

Faculty Working Papers from the School of Education

Book Chapter

Research Studies In Higher Education: Educating Multicultural College Students-Ch 4, Ron Brown

Faculty Working Papers from the School of Education

Book Chapter

Research Studies In Higher Education: Educating Multicultural College Students-Ch 5, Bryan Andriano

Faculty Working Papers from the School of Education

Book Chapter

Research Studies In Higher Education: Educating Multicultural College Students-Ch 8, Kimberly Brown

Faculty Working Papers from the School of Education

Book Chapter