Digital Commons Network^™

Iowa Satellite Project, Leverne Seversike

Small Satellite Conference

With a few exceptions, satellite systems to date have been large and expensive. Over the past decade, there has been a growing interest in small, inexpensive satellites built and operated by universities to provide students with a 'hands on' engineering experience. It was decided that the university would design, build, and operate a satellite called ISAT-1. The primary mission of ISAT-1 is to provide a broad educational experience to Iowa citizens of all age groups and educational backgrounds. The requirements of the project are that ISAT-1 must be a small, inexpensive satellite that can be launched by mid-1996, have an …

Experimental Multimission Microsatellites - Kitsat Series, Impyeong Lee, Dan Keun-Sung, Soon Dal Choi

Small Satellite Conference

This paper is to report the result of the first Korean satellite, KITSAT-OSCAR 23 (KITSAT-1) and to introduce the KITSAT-B to be launched in September 1993.

Overview Of The Scd1/Pegasus Mission, Jaime Fernandez, Carlos Santana

Small Satellite Conference

An overview of the third operational Pegasus mission, carrying the Brazilian Satelite de Coleta de Dados 1 (SCD1) satellite is presented. Developed by INPE, the 250 Ib, spin stabilized satellite will perform real time repeating of environmental data gathered by automatic ground stations throughout Brazil. The target orbit, 405 nm (750 km) at 25 deg inclination, was chosen to provide coverage of the entire Brazilian territory. A review of the SCD1 design, development and testing highlights the effectiveness of lightsat philosophy complemented by pc-based check-out and control equipment. A six month schedule from go-ahead to launch was achieved in spite …

The Freja Magnetospheric Research Satellite Design And Flight Operations, Sven Grahn

Small Satellite Conference

The FREJA magnetospheric research satellite was launched on October 6, 1992 as a "piggyback" payload on a Long March 2C rocket from the Jiuquan Satellite Launch Center in China. The satellite is in an orbit between 601 and 1756 km at 63.0° inclination. FREJA is a sun-pointing spinner with a 2.2 m diameter and 214.0 kg mass. The Swedish Space Corporation is the Prime Contractor to the Swedish National Space Board. FREJA images the aurora and measures particles and fields in the upper ionosphere and lower magnetosphere. Swedish, German, Canadian and U.S. instruments are flown on the satellite. Ground stations …

Tubsat, Low Cost Access To Space Technology, U. Renner, B. Lobke-Ossenbeck, P. Butz

Small Satellite Conference

TUBSAT is a low cost platform for space technology experiments. Although its size is modest (micro-satellite class), it provides remarkable volume and space to the experiment. TUBSAT-A has been launched already and is not attitude controlled. TUBSAT-B and consecutive models will be provided with high accuracy (arc sec) attitude control to any desired direction via star sensor plus 3 reaction wheels. The launch of TUBSAT-B is presently scheduled for October 1993.

Gro-Sat: The Development Of An Extended Life Support System For Plants In Microgravity, Kathleen Blizard, Robert Jacobs, Kathryn Chevalier, Brenda Paul

Small Satellite Conference

The effects of a microgravity environment on the entire life cycle of plants is not yet fully understood. A conceptual design for the payload of a Get Away Special canister has been developed to implement a complete life support system for plants. This small satellite is a closed system that must maintain plant life for at least three months. It consists of an innovative lighting system and a complete plant nutrient delivery system. The use of hardware to limit long-term contamination of the nutrient solution in the closed system as well as other considerations are discussed. The design, based on …

Sunsat, Stellenbosch University And Sa-Amsat's Remote Sensing And Packet Communications Microsatellite, G.W. Milne, P.J. Bakkes, A. Schoonwinkel, J.J. Du Plessis, J.H.R. Enslin

Small Satellite Conference

The Engineering Model of SUNSAT, a 50 kg, 45 cm, Ariane ASAP-compatible microsatellite is scheduled for assembly in December 1993, permitting flight model completion early in 1995. Fifteen M.Eng. students, led by Computer & Control System lecturers at Stellenbosch University, began detail design in January 1992. Most prototype hardware was operating by July 1993, and assembly of the first final-sized PCB's started. A packet radio service, a 2m parrot speech transponder, and Mode A and S transponders, all defined and endorsed by SA-AMSAT, comprise the Amateur Radio communications payload. Verification of the 15-20 m pixel spacing, 3-color, 3456 pixel pushbroom …

Small Spacecraft Conceptual Design For A Lunar Polar Mapping/Educational Spacecraft, Peter Warren, Michel Loucks

Small Satellite Conference

The Lunar Educator is a Phase A mission definition and development activity being undertaken by the University of Colorado's Space Grant Consortium. The scientific objectives of the mission are to provide greater than 50 meter resolution visual images of the Lunar polar regions from various lighting angles in order to discover permanently shadowed craters, and, if spacecraft lifetime allows, to digitally map the entire lunar surface. Of equal importance is the program's educational objective to use this mission as a platform to educate and excite people of all ages in math, science, engineering, and space exploration. The Lunar Educator program …

Scenario On Orbital Experiment System Using Small Satellites Of Nasda, Atsuo Tsuiki, Yasuhiro Kawada, Tetsuo Hidaka

Small Satellite Conference

This paper presents the scenario on orbital experiment system using small satellites of the National Space Development Agency of JAPAN (NASDA). On this scenario, the main missions of the small satellites are the experiment of the earth observation, the satellite communications, and the others on orbit. And the small satellites will be launched by the small launch vehicle J-I of NASDA. As the first mission of this scenario, NASDA had studied the Optical Inter-orbit Communication Engineering Test Satellite (OICETS) system, and has started its development from the spring of 1993. Through this study, the small common satellite bus had been …

Professional Orientation Equals Second-Class Status In Academe, Ted Pease

Journalism and Communication Faculty Publications

Surveys journalism educators to examine the classic, divisive tension between professional and scholarly journalism activities. Details the extent and kind of their ongoing professional media activities. Discusses how those involvements play in the classroom and with promotion and tenure committees, department heads, and college administrators.

New Singularity In Anisotropic, Time-Dependent Solutions To Maximally Gauss-Bonnet Extended Gravity, T. Kitaura, James Thomas Wheeler

All Physics Faculty Publications

Among the solutions for anisotropic, time-dependent, maximally Gauss-Bonnet extended gravity, we find a class of curvature singularities for which the metric components remain finite. These new singularities therefore differ in type from the standard Kasner-like divergences expected for this class of theories. We study perturbative solutions near the singularity and show that there exist solutions with timelike paths that reach the singularity in finite proper time. Solving the equation of geodesic deviation in the same approximation, we show that the comoving coordinate system does not break down at the singularity. A brief classification of the corresponding singularity types in Robertson-Walker …

Radio—The Forgotten Medium, Everette E. Dennis, Ted Pease

Journalism and Communication Faculty Publications

ASK ABOUT "THE MEDIA" and people think first of television, then newspapers. Sometimes, though not always, they acknowledge the existence of radio. But it is not uncommon for media critics to ignore radio altogether in their treatment of the larger modern media mix. Although the average American owns multiple radios and lives with this most portable medium in every room in the house, in the office, the car and even in parks, mountain retreats and at the beach, radio is rarely the topic of public discussion, giving it the dubious identity of "the forgotten medium." This, the oldest of the …

Immunological Pathogenesis Of Endolymphatic Hydrops And Its Relation To Meniere's Disease, S. Tomiyama, T. Yagi, M. Sakagami, K. Fukazawa

Scanning Microscopy

This study was designed to investigate an immunologically induced endolymphatic hydrops (ELH) and to focus on the issue of its pathogenesis in relation to Meniere's disease. The time course of ELH was evaluated by light microscopy in a 2-hour to 7-month period following direct antigen challenge to the endolymphatic sac (ELS) in systemically pre-sensitized guinea pigs. ELH began to appear in the vestibule and the basal turn 5-7 hours after inner ear challenge and developed gradually. During the interval from the second day to the first week, ELH rapidly developed in all the cochlear turns and reached a maximum size. …

Sample Preparation Techniques For Conventional And High Resolution Scanning Electron Microscopy Of The Central Nervous System. The Cerebellum As A Model, Orlando J. Castejon

Scanning Microscopy

In the present paper some basic sample preparation techniques for scanning electron microscopy of nervous tissue are described. These basic preparative methods include conventional scanning electron microscopy or slicing technique, ethanol-cryofracturing technique, freeze-fracture method using either liquid nitrogen (slow freezing) or Freon 22 cooled by liquid nitrogen (fast freezing), improved freeze-fracture method with delicate specimen preparation and chromium coating, ultrasonic microdissection, and "creative tearing" technique. Some basic principles, advantages and limitations are critically considered. In addition, some specific applications in neurobiological research are reported. Emphasis is placed upon understanding the sources and nature of artifacts that are likely to be …

Art, Advertising, And Everything Else., Maria Esparza

Undergraduate Honors Capstone Projects

I always wanted to "do" advertising ever since I was five years old. I'd sit in front of the TV on Saturday morning and edit the toy commercials in my head. I wasn't sure what I was doing--but I knew it was better than what was on TV.

Protein Inhibitors Of Calcium Salt Crystal Growth In Saliva, Bile And Pancreatic Juice, J. M. Verdier, B. Dussol, Y. Berland, J. C. Dagorn

Scanning Microscopy

The control of the formation of crystals in biological fluids is one of the most exciting field of research involving both organic and biochemical areas. Many organisms have evolved mechanisms which minimize or avoid the effects of nucleation and crystal growth formation. One of the most important mechanism is the interaction of specific proteins, called inhibitors, with crystals which alters their habits and leads to their elimination. This article, focused on saliva, pancreatic juice and bile, reviews our present knowledge on the structure-function relationships existing between these proteins and their ability to inhibit the growth of different calcium salt crystals.

Comparative Aspects Of Splenic Microcirculatory Pathways In Mammals: The Region Bordering The White Pulp, E. E. Schmidt, I. C. Macdonald, A. C. Groom

Scanning Microscopy

Splenic microcorrosion casts prepared using minimal volumes of material show that most of the flow passes through the region bordering the white pulp. However, the nature of these microcirculatory pathways has received little attention. We have studied these in dog, cat, rat, mouse, and normal versus diseased human spleens. In all 5 species, a marginal sinus (MS) of anastomosing vascular spaces 5-10 μm thick lies between the white pulp and marginal zone (MZ). The morphology differs between species and the MS is absent in immune thrombocytopenia. The MS fills by circumferential flow before blood passes outward to the MZ. Many …

The Syringomycins: Finding Their Role In Nature, Jon Takemoto

Faculty Honor Lectures

About ten years ago, I began looking for a research problem in the field of plant-microbe interactions. As the name implies, this is the study of how plants and microorganisms associate-either for their mutual benefit or at the expense of one partner. An example is symbiotic nitrogen fixation between leguminous plants and root-colonizing bacteria. Both benefit-the plant gains nitrogen in a useful form and the bacteria gain nutrients and protection. A better understanding of a plant-microbe interaction system could be used to benefit agriculture. For example, boosting nitrogen fixation would mean less petroleum-derived nitrogen fertilizers. These interactive biological systems and …

Insights, Spring, 1993, Utah State University

Discovery Magazine

Bi-annual alumni newsletter for the College of Science of Utah State University in Logan.

Characterization And Transcription Analysis Of Dictyostelium Discoideum Plasmid Ddp5, William Kurt Rieben Jr.

Biology

While nuclear-associated, eukaryotic plasmids are rare, cellular slime molds in the Dictyostelium genus harbor many of them. The Ddp5 plasmid is one carried by Dictyostelium discoideum strain WS2162. I have produced a restriction site map of Ddp5; Kpn I, Sal I, and Bgl II have unique sites. Subcloned Ddp5 sequences were stable in E. coli except that deletion derivatives missing about 2.5 or 3 kilobase pairs were observed with p34d5, a recombinant plasmid containing a region of Ddp5 and the cloning vector pGEM3Z, and with full length lambda clones. By cotransforming two of the subcloned DNA plasmids into the plasmid-free …

The Lethal And Sublethal Effects Of Carbaryl Bran Bait On A Representative Pollinator Of Rare Plants, The Alfalfa Leafcutting Bee (Hegachile Rotundata F.), And Potential Effects On The Reproduction Of The Endangered Plant, Pediocactus Sileri Benson, Matthew Peach

Biology

Reproduction by entomophilous, endangered plant species may be threatened by insecticide applications if these applications are shown to have detrimental effects on pollinators. Pediocactus sileri Benson is one endangered plant that may be affected by carbaryl bran bait (2% A.I.) applications currently being considered for use on the rangelands of the Arizona Strip. This study was conducted to determine the potential effects of carbaryl bran bait applications on the pollination of P. sileri. In an experiment designed to reduce pollinator visits by 2/3 to 4/5, P. sileri was not shown to be pollinator limited. Therefore, reductions in P. sileri …

Transformation And Gene Isolation By Functional Complementation In Cryphonectria Parasitica, The Chestnut Blight Fungus, Alice C. L. Churchill

Biology

An efficient DNA-mediated transformation system has been developed for the chestnut blight fungus Cryphonectria parasitica. Twelve vectors, each containing one of three dominant selectable antibiotic genes, were tested for their ability to confer resistance to either hygromycin B, benomyl, or G418 sulfate. Transformants were obtained with each vector screened, and in each case, transformation occurred by integration of the transforming DNA into the host genome. The cosmid vector pMOcosX conferred hygromycin B resistance to transformants at an efficiency of greater than 10⁴ transformants/µg DNA and was utilized for the construction of a wild-type genomic DNA library. This library …

Molecular Cloning And Developmental Expression Of Sq1, A Camp Inducible Gene Of Dictyostelium Discoideum, Parvin Boulurani

Biology

This thesis reports the molecular cloning, sequence analysis, and developmental expression of a novel Dictyostelium discoideum gene, SQ1. The SQ1 gene was isolated as a set of overlapping cDNA and genomic clones. The longest of these is a 1.5 kb genomic DNA that contains the entire 3, portion of the coding region, and a cDNA that extends the available sequence 0.7 kb 5' of the genomic DNA. The SQ1 mRNA is 2.7 kb and the available cloned sequence is 2239 nucleotides. By assuming a 3, untranslated region of 100 nucleotides, approximately 400 nucleotides of transcribed sequence remain uncloned. The complete …

Incidence Of Antibodies To Cytomegalovirus In Autistic Patients, David M. Schubert

Biology

Research into the etiology of autism continues without any definitive answers. Recent studies suggest that immune abnormalities may be associated with this disorder and that autism may result from a prenatal viral infection. Past research has associated cytomegalovirus (CMV) and rubella in autism. This research indirectly studied, via the screening of blood samples for IgG and IgM anti-antibodies to CMV, the possibility that CMV may be an etiological agent in autism. The autistic subjects as compared to age matched controls exhibited no significant differences in either the percentage of those testing positive for IgG antibodies to CMV or in the …

Immunomodulatory Role Of Corticotropin-Releasing Factor, Sy-Jye Christine Leu

Biology

Relationships between neuroendocrine and immune systems prompted this study of the immunomodulatory role of corticotropin-releasing factor (CRF), a peptide hormone of the neuroendocrine system. This research investigated the effect of CRF on the in vitro synthesis of interleukins (interleukin-1[IL-1], interleukin-2 [IL-2] and interleukin-6 [IL-6)), natural killer (NK) cell activity, antibody production, and cAMP accumulation in immunocytes. CRF (l0^-9 M) induced bioactive cytokines like IL-1, IL-2, and IL-6 in peripheral blood mononuclear cells (MNC) from healthy subjects. Two structurally related peptides (TyrCRF and α-helical-CRF_9-41) also elicited 16- to 21-fold stimulation of IL-6. CRF stimulated purified monocytes, but not …

A Linguistic Approach To Gender Bias In Student Evaluations Of Teachers, Paula H. Larsen

Undergraduate Honors Capstone Projects

Few people would deny that discrimination occurs in American society today. In spite of extensive national and local legislation intended to safeguard the rights of every individual, discrimination still exists although, of necessity, it is more insidious, often to the point of invisibility to all but those directly affected by it. Many groups of people experience discrimination in their everyday lives--Blacks, Hispanics, Vietnamese, physically handicapped persons, and the elderly--to name just a few. Another segment of our society, women, also experience discrimination.

The Use Of Object-Oriented Design Methodologies In Systems Design, Rick C. Larkin

Undergraduate Honors Capstone Projects

Object-oriented design methodologies, along with object-oriented programming techniques, have recently gained significant popularity as their advantages have become evident. Traditional methodologies following the structured approach have not been successful in providing an accurate model of the business system.Object-oriented techniques, where an object in the computer system corresponds to a real-world object, have been much more successful in accurately modeling the business system and its environment.

Object-oriented methodologies provide many advantages over structured approaches to systems design. Concepts such as data hiding, encapsulation, inheritance, dynamic binding, and polymorphism help to achieve an accurate and flexible system that is resistant to corruption …

Effects Of Otitis Media On Language Development In Native Populations: A Review Of The Literature, Monica Malmgren

Undergraduate Honors Capstone Projects

From the time a fetus reaches about 20 weeks gestational age, its auditory system is functioning. Before we are ever born, we are exposed to sounds within our environment. With birth, we begin to interact with, experiment with, and learn to interpret the sounds around us. Before learning to speak, we are bombarded by the sounds of our language. An infant's head is known to perk up at the sound of a voice, a sudden noise, music... all the sounds of the environment, which is evidence that children are aware of the sounds around them before they are ever able …

The Role Of Gender Differences In The Relationship Between Guilt- And Shame-Proneness And Depressive Symptomatology, Julie Bingham Shiffler

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

The purpose of this study was to examine the role played by gender in the relationship between the degree of depressive symptomatology and levels of adaptive guilt-, maladaptive guilt-, and shame-proneness in a college population. A measure of depressive symptomatology (the Beck Depression Inventory) and a measure of guilt- and shame-proneness (the Self-Conscious Affect and Attribution Inventory - Revised) were administered to 299 college students (113 males and 186 females). Females reported higher total levels of depressive symptomatology than males. Statistically significant gender differences were found for nine BDI items. Females also had higher levels of adaptive guilt-, maladaptive guilt-, …

A Study Of Factors Controlling Physical Properties Of Mozzarella Cheese And The Manufacture Of A Reduced Fat Mozzarella Cheese, Richard Kevin Merrill

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

Variables affecting the physical properties of Mozzarella cheese were investigated. The effects of various milk-clotting enzymes were examined. The type of milk coagulating enzyme used played a significant role in determining physical properties of direct acid Mozzarella cheese. Cook color was not affected by enzyme type, but melt and stretch were significantly affected.

Proteolytic nature of starter cultures was reviewed and recommendation s were give n. Cheese made with proteinase-deficient strains had more stretch after holding for 14 and 28 d than cheese made with non-deficient strains. Cheese made with pairs or single strains of L. helveticus had the same …