Control law synthesis and optimization software for large order aeroservoelastic systems

A flexible aircraft or space structure with active control is typically modeled by a large-order state space system of equations in order to accurately represent the rigid and flexible body modes, unsteady aerodynamic forces, actuator dynamics and gust spectra. The control law of this multi-input/multi-output (MIMO) system is expected to satisfy multiple design requirements on the dynamic loads, responses, actuator deflection and rate limitations, as well as maintain certain stability margins, yet should be simple enough to be implemented on an onboard digital microprocessor. A software package for performing an analog or digital control law synthesis for such a system, using optimal control theory and constrained optimization techniques is described

К расчету неустановившихся режимов в цепи с синусоидальными э. д. с.

LIBS (Laser-induced breakdown spectrometry) ist eine Methode mit einem breiten Anwendungspotenzial für Analysenaufgaben wie Prozesskontrolle und Qualitätssicherung. Ein Anwendungsbereich in der Stahlindustrie ist der Hochofen, wo zum ersten Mal Online und In-situ eine kontinuierliche Überwachung von Kreislaufstoffen im Gichtgas ermöglicht wurde. Der Zugang zum Gichtgasrohr erfolgt über eine Sonde, die räumlich aufgelöste Messungen ermöglicht und der Umgebung angepasst wurde: mittlere Temperatur von 120 Grad C, Gasgeschwindigkeiten von 10-20 m/s, Staubdichten von 8 g/m3 bei einem CO-Anteil von 24 Prozent im Gichtgas. Durch Modulation der Laserpulse wurden erstmalig Doppelpulse im Nanosekundenbereich eingesetzt, die das Signal-zu-Untergrund-Verhältnis der Spektrallinien erheblich verbessern und so erst Messungen bei den vorliegenden Gasdrücken um 3.4 bar ermöglichen

NASP aeroservothermoelasticity studies

Some illustrative results obtained from work accomplished under the aerothermoelasticity work breakdown structure (WBS) element of the National Aerospace Plane (NASP) Technology Maturation Program (TMP) are presented and discussed. The objectives of the aerothermoelasticity element were to develop analytical methods applicable to aerospace plane type configurations, to conduct analytical studies to identify potential problems, to evaluate potential solutions to problems, and to provide an experimental data base to verify codes and analytical trends. Work accomplished in the three areas of experimental data base, unsteady aerodynamics, and integrated analysis methodology are described. Some of the specific topics discussed are: (1) transonic wind tunnel aeroelastic model tests of cantilever delta wing models, of an all-moveable delta-wing model, and of aileron buzz models; (2) unsteady aerodynamic theory correlation with experiment and theory improvements; and (3) integrated analysis methodology results for thermal effects on vibration, for thermal effects on flutter, and for improving aeroelastic performance by using active controls

Pairwise Well-Formed Modes and Transformations

One of the most significant attitudinal shifts in the history of music occurred in the Renaissance, when an emerging triadic consciousness moved musicians towards a new scalar formation that placed major thirds on a par with perfect fifths. In this paper we revisit the confrontation between the two idealized scalar and modal conceptions, that of the ancient and medieval world and that of the early modern world, associated especially with Zarlino. We do this at an abstract level, in the language of algebraic combinatorics on words. In scale theory the juxtaposition is between well-formed and pairwise well-formed scales and modes, expressed in terms of Christoffel words or standard words and their conjugates, and the special Sturmian morphisms that generate them. Pairwise well-formed scales are encoded by words over a three-letter alphabet, and in our generalization we introduce special positive automorphisms of $F3$, the free group over three letters.Comment: 12 pages, 3 figures, paper presented at the MCM2017 at UNAM in Mexico City on June 27, 2017, keywords: pairwise well-formed scales and modes, well-formed scales and modes, well-formed words, Christoffel words, standard words, central words, algebraic combinatorics on words, special Sturmian morphism

Geothermal probabilistic cost study

A tool is presented to quantify the risks of geothermal projects, the Geothermal Probabilistic Cost Model (GPCM). The GPCM model was used to evaluate a geothermal reservoir for a binary-cycle electric plant at Heber, California. Three institutional aspects of the geothermal risk which can shift the risk among different agents was analyzed. The leasing of geothermal land, contracting between the producer and the user of the geothermal heat, and insurance against faulty performance were examined

Renovation housing: analysis methods and evaluation of investment projects

The article discusses the problem of providing the population of any country affordable and comfortable housing is key in ensuring sustainable economic development. The author has been compiled a statistical analysis of the need for housing renovation in the Tomsk region. The high capital investment projects in this field it seems necessary to look for new sources of funding, as well as pre-assess their effectiveness

Shape differences rather than size differences between castes in the Neotropical swarm-founding wasp Metapolybia docilis (Hymenoptera: Vespidae, Epiponini)

BACKGROUND: Swarm-founding epiponine wasps are an intriguing group of social insects in which colonies are polygynic (several queens share reproduction) and differentiation between castes is often not obvious. However, caste differences in some may be more pronounced in later phases of the colony cycle. RESULTS: Using morphometric analyses and multivariate statistics, it was found that caste differences in Metapolybia docilis are slight but more distinct in latter stages of the colony cycle. CONCLUSIONS: Because differences in body parts are so slight, it is proposed that such variation may be due to differential growth rates of body parts rather than to queens being larger in size, similar to other previously observed epiponines

Doan Ye Cry Ma Honey / music by Albert V. Noll; words by Albert V. Noll

Cover: description reads darky song; Publisher: Oliver Ditson Company (Boston)https://egrove.olemiss.edu/sharris_a/1047/thumbnail.jp