Communications satellite systems capacity analysis

Analog and digital modulation techniques are compared with regard to efficient use of the geostationary orbit by communications satellites. Included is the definition of the baseline systems (both space and ground segments), determination of interference susceptibility, calculation of orbit spacing, and evaluation of relative costs. It is assumed that voice or TV is communicated at 14/11 GHz using either FM or QPSK modulation. Both the Fixed-Satellite Service and the Broadcasting-Satellite Service are considered. For most of the cases examined the digital approach requires a satellite spacing less than or equal to that required by the analog approach

Orbit Transfer Rocket Engine Technology Program: Advanced engine study, task D.1/D.3

Concepts for space maintainability of OTV engines were examined. An engine design was developed which was driven by space maintenance requirements and by a failure mode and effects (FME) analysis. Modularity within the engine was shown to offer cost benefits and improved space maintenance capabilities. Space operable disconnects were conceptualized for both engine change-out and for module replacement. Through FME mitigation the modules were conceptualized to contain the least reliable and most often replaced engine components. A preliminary space maintenance plan was developed around a controls and condition monitoring system using advanced sensors, controls, and condition monitoring concepts. A complete engine layout was prepared satisfying current vehicle requirements and utilizing projected component advanced technologies. A technology plan for developing the required technology was assembled

Orbit transfer rocket engine technology program. Phase 2: Advanced engine study

In Phase 2 of the Advanced Engine Study, the Failure Modes and Effects Analysis (FMEA) maintenance-driven engine design, preliminary maintenance plan, and concept for space operable disconnects generated in Phase 1 were further developed. Based on the results of the vehicle contractors Orbit Transfer Vehicle (OTV) Concept Definition and System Analysis Phase A studies, minor revisions to the engine design were made. Additional refinements in the engine design were identified through further engine concept studies. These included an updated engine balance incorporating experimental heat transfer data from the Enhanced Heat Load Thrust Chamber Study and a Rao optimum nozzle contour. The preliminary maintenance plan of Phase 1 was further developed through additional studies. These included a compilation of critical component lives and life limiters and a review of the Space Shuttle Main Engine (SSME) operations and maintenance manual in order to begin outlining the overall maintenance procedures for the Orbit Transfer Vehicle Engine and identifying technology requirements for streamlining space-based operations. Phase 2 efforts also provided further definition to the advanced fluid coupling devices including the selection and preliminary design of a preferred concept and a preliminary test plan for its further development

Alien Registration- Hines, Laura B. (Lewiston, Androscoggin County)

https://digitalmaine.com/alien_docs/28568/thumbnail.jp

Comparative Phylogeography of the Emperor Snappers \u3ci\u3eLethrinus Lentjan\u3c/i\u3e and \u3ci\u3eLethrinus Harak\u3c/i\u3e (Lethrinidae: Percoidei) in the Coral Triangle

Many questions remain regarding the origins of the well-known peak in marine biodiversity found in the Coral Triangle. Barriers to gene flow may promote lineage diversification and provide the potential for speciation contributing to the high biodiversity in this area. Population structure was examined in two species of Emperor Snappers (Lethrinidae), Lethrinus harak and Lethrinus lentjan. These species were selected because they share similar life-history traits and geographic distributions, but differ in their habitat preferences. Specimens were collected from within the Coral Triangle as well as other localities across the Indo-Pacific. To investigate phylogeographic patterns and structure a hypervariable region of the mtDNA Control Region was amplified, sequenced and analyzed. Both Lethrinus species show genetic breaks in the western part of the Coral Triangle which corroborates previously established phylogeographic barriers. In L. lentjan, observed genetic similarity varied across the Thai-Malay Peninsula in the Andaman Sea and the Gulf of Thailand, and populations were genetically distinct from sites within the Philippines and central Indonesia. Genetic differences in L. lentjan were also found between sites in central and southern Vietnam, which is hypothesized to be caused by a barrier to larval dispersal because of changes in water conditions at the mouth of the Mekong River

Time-of-Day Effects on Human Performance

The course of study of time-of-day effects on human performance has not been an easy one to chart, with many findings that seem to be in opposition. This review examines the difference between group and individual differences with regard to time-of-day effects; time-of-day effects in individuals; morningness-eveningness as an individual characteristic; morningness-eveningness in adolescents; effect of time of day on cognition and academic performance; time-of-day effects on intelligence, testing, and academic achievement; the effect of matching individuals to their preferred time on academic achievement; and motivation as a primary confounding variable in time-of-day preference/academic performance studies. Other possible confounding variables and procedures in testing time-of-day effects are also briefly examined

Legal forms for common use in Georgia : embracing over four hundred approved precedents, for affidavits, agreements, bills of sale, deeds, notes, etc., etc., also, forms in judicial proceedings, arbitrations, attachments, orders, process, pleading, probate of deeds, rules, wills, etc., etc., with others to guide attorneys, magistrates, justices of the Inferior Court, constables, sheriffs, ordinaries, clerks, etc., etc., in the many duties required of them by law : to which is added an appendix containing the statutory provisions as to county officers, magistrates, and elections, the rules of court, and the Constitution of Georgia

Excerpt from the preface: The object of the present volume is to furnish the legal profession, magistrates, county officers, and private citizens of this State, with a plain, accurate, and complete Form Book, which shall be cheap in price, and convenient in size, and so arranged that any one, however ignorant of such formulas, can use it when the occasion presents itself. Added to the forms, in the body of the work, are such directions and suggestions as it was supposed would be useful. In the Appendix are the statutory enactments of our State in regard to county .officers, magistrates, taxes, and elections, together with the rules of Court and the Constitution of Georgia. As it would have altered the plan of the work to have attempted to digest the laws upon subjects not treated of, or to have added annotations of judicial decisions, it has not been done, although it no doubt would have proven an addition to the work. If need be, this could be added to any future edition. The original edition was published in Macon in 1853, met with a ready sale,- and was soon exhausted. This success led the author of the work to entertain the idea of another edition, and he had prepared some matter for it, but sold the copyright in 1854 to the present proprietor, without finishing the preparation necessary for it. This, and his decease in 1856, made it necessary for the present editor to complete the work. The reader is not expected to care much as to the paternity of the work, and hence no mark has been fixed by which the labors of the two compilers can be separated; the comparison of the two editions will, however, easily distinguish them. The forms given are such as have been approved by our Supreme or Superior Courts, or taken from the best books of precedents, and, in some cases, from models furnished by cases in Court, drawn by practitioners of the best position. Many of them were used in the office of my father for thirty years, in his extensive practice in Milledgeville and Macon, and his correctness and research will no doubt guaranty them in the estimation of the people of Georgia, among whom he he had so many warm personal friends and admirers. Albany, Georgia, July 1st, 1858.https://digitalcommons.law.uga.edu/historic_treat/1003/thumbnail.jp