Solar cell angular position transducer

An angular position transducer utilizing photocells and a light source is disclosed. The device uses a fully rotatable baffle which is connected via an actuator shaft to the body whose rotational displacement is to be measured. The baffle blocks the light path between the light source and the photocells so that a constant semicircular beam of light reaches the photocells. The current produced by the photocells is fed through a resistor, a differential amplifier measures the voltage drop across the resistor which indicates the angular position of the actuator shaft and hence of the object

Experimental parametric studies of transonic T-tail flutter

Wind-tunnel tests of the T-tail of a wide-body jet airplane were made at Mach numbers up to 1.02. The model consisted of a 1/13-size scaled version of the T-tail, fuselage, and inboard wing of the airplane. Two interchangeable T-tails were tested, one with design stiffness for flutter-clearance studies and one with reduced stiffness for flutter-trend studies. Transonic antisymmetric-flutter boundaries were determined for the models with variations in: (1) fin-spar stiffness, (2) stabilizer dihedral angle (-5 deg and 0 deg), (3) wing and forward-fuselage shape, and (4) nose shape of the fin-stabilizer juncture. A transonic symmetric-flutter boundary and flutter trends were established for variations in stabilizer pitch stiffness. Photographs of the test configurations are shown

Interstellar grain chemistry and organic molecules

The detection of prominant infrared absorption bands at 3250, 2170, 2138, 1670 and 1470 cm(-1) (3.08, 4.61, 4.677, 5.99 and 6.80 micron m) associated with molecular clouds show that mixed molecular (icy) grain mantles are an important component of the interstellar dust in the dense interstellar medium. These ices, which contain many organic molecules, may also be the production site of the more complex organic grain mantles detected in the diffuse interstellar medium. Theoretical calculations employing gas phase as well as grain surface reactions predict that the ices should be dominated only by the simple molecules H2O, H2CO, N2, CO, O2, NH3, CH4, possibly CH3OH, and their deuterated counterparts. However, spectroscopic observations in the 2500 to 1250 cm(-1)(4 to 8 micron m) range show substantial variation from source reactions alone. By comparing these astronomical spectra with the spectra of laboratory-produced analogs of interstellar ices, one can determine the composition and abundance of the materials frozen on the grains in dense clouds. Experiments are described in which the chemical evolution of an interstellar ice analog is determined during irradiation and subsequent warm-up. Particular attention is paid to the types of moderately complex organic materials produced during these experiments which are likely to be present in interstellar grains and cometary ices

VID I OKUS: KORPUSNA ANALIZA ENGLESKIH KONSTRUKCIJA TIPA PRIDJEV – IMENICA

Embodiment is central to the Cognitive Linguistics enterprise. The grounding of language in body experience is one of the major tenets of linguistic description at various levels of analysis. We receive the infor-mation of the world around us through the bodily sensations; i.e. we per-ceive, then process and conceptualize it. Research into the sensory do-mains has continued to elicit further examination of how we use meta-phoric and metonymic cross-modal conceptualization in language. Inves-tigation has been carried out both on the single sense domains of touch, taste, smell, hearing, and sight, but also on cross-modality or synesthetic phenomena. Linguistic transfer between various senses seems to respect a hierarchy from the lower (touch, taste, smell) to the higher senses (hear-ing and sight), even though some variation of this hierarchy has been noted. The present study is the first part of a two-fold analysis of cross-modal linguistic mappings that exist between the senses of taste and sight. The objective is to verify what collocations occur between the two do-mains: do they respect the hierarchy, and how frequent, or how strong are they? Corpus analysis of the construction of the adjective + noun type are in keeping with existing literature: the sensory domain that func-tions as source is understood as an adjective modifying another sensory domain, which is found in the form of a noun. This research concentrates on cross-modal pairs found through a corpus-based analysis of taste ad-jectives in the description of vision nouns, e.g. delicious colors. Linguis-tic data were retrieved from corpora that allow for comparison of the ac-tual usage and definition of these constructions. These include the Cor-pus of Contemporary American English (COCA), and the Mapping Meta-phor with the Historical Thesaurus of English. The experimental method-ology is in keeping with the usage-based approach of Cognitive Linguis-tics, considering frequency and relevance.Otjelovljenost je središnji pojam u okviru kognitivnolingvističke paradigme. Utemeljenost jezika u tjelesnom iskustvu jedna je od glavnih postavki u opisu jezika na različitim razinama. Putem tjelesnih osjeta primamo, a potom obrađujemo i konceptualiziramo, informacije o svijetu. Istraživanja osjetilnih domena kontinuirano potiču daljnje studije o tome kako se koristimo metaforičkom i metonimijskom višeosjetilnom konceptualizacijom u jeziku. Istražuju se pojedinačne osjetilne domene dodira, okusa, mirisa, sluha i vida, ali i višeosjetilnost, odnosno sinestetske pojave. Jezični prijenos između različitih osjeta, čini se, ravna se prema hijerarhiji koja ide od nižih (dodir, okus, miris) prema višim osjetima (sluh i vid), iako su zapažena neka odstupanja. Ova je studija prvi dio dvodijelne analize jezičnih preslikavanja koja uključuju modalitete okusa i vida. Cilj je utvrditi koje se kolokacije uspostavljaju među dvama domenama, ravnaju li se one prema spomenutoj hijerahiji, koliko su česte te koliko su jake. Rezultati analize korpusa konstrukcija tipa pridjev + imenica podudaraju se s nalazima iz literature: osjetilna domena koja funkcionira kao izvorna domena interpretira se kao pridjev koji modificira drugu osjetilnu domenu koja se leksikalizira kao imenica. Ovo se istraživanje usredotočuje na parove pronađene korpusnom analizom pridjeva koji označavaju okus kao modifikatora imenica koje označavaju vidne podražaje, npr. delicious colours (‘ukusne boje’). Jezični podatci crpljeni su iz korpusa koji omogućuju usporedbu aktualne porabe i definiciju tih konstrukcija (Corpus of Contemporary American English (COCA) te Mapping Metaphor with the Historical Thesaurus of English). Eksperimentalna metodologija, tj. uočavanje čestotnosti i relevantnosti, u skladu je s uporabnim modelom kognitivne lingvistike

Transonic flutter study of a 50.5 deg cropped-delta wing with two rearward-mounted nacelles

Transonic flutter characteristics of three geometrically similar delta-wing models were experimentally determined in the Langley transonic dynamics tunnel at Mach numbers from about 0.6 to 1.2. The models were designed to be simplified versions of an early supersonic transport wing design. The model was an aspect-ratio-1.28 cropped-delta wing with a leadingedge sweep of 50.5 deg. The flutter characteristics obtained for this wing configuration indicated a minimum flutter-speed index near a Mach number of 0.92 and a transonic compressibility dip amounting to about a 27-percent decrease in the flutter-speed index relative to the value at a Mach number of 0.6. Analytical studies were performed for one wing model at Mach numbers of 0.6, 0.7, 0.8, and 0.9 by using both doublet-lattice and lifting-surface (kernel-function) unsteady aerodynamic theory. A comparison of the analytical and experimental flutter results showed good agreement at all Mach numbers investigated

Development and demonstration of a flutter-suppression system using active controls

The application of active control technology to suppress flutter was demonstrated successfully in the transonic dynamics tunnel with a delta-wing model. The model was a simplified version of a proposed supersonic transport wing design. An active flutter suppression method based on an aerodynamic energy criterion was verified by using three different control laws. The first two control laws utilized both leading-edge and trailing-edge active control surfaces, whereas the third control law required only a single trailing-edge active control surface. At a Mach number of 0.9 the experimental results demonstrated increases in the flutter dynamic pressure from 12.5 percent to 30 percent with active controls. Analytical methods were developed to predict both open-loop and closed-loop stability, and the results agreed reasonably well with the experimental results

Clathrate type 2 hydrate formation in vacuo under astrophysical conditions

The properties of clathrate hydrates were used to explain the complex and poorly understood physical processes taking place within cometary nuclei and other icy solar system bodies. Most of all the experiments previously conducted used starting compositions which would yield clathrate types I hydrates. The main criterion for type I vs. type II clathrate hydrate formation is the size of the guest molecule. The stoichiometry of the two structure types is also quite different. In addition, the larger molecules which would form type II clathrate hydrates typically have lower vapor pressures. The result of these considerations is that at temperatures where we identified clathrate formation (120-130 K), it is more likely that type II clathrate hydrates will form. We also formed clathrate II hydrates of methanol by direct vapor deposition in the temperature range 125-135 K

Low-pressure clathrate-hydrate formation in amorphous astrophysical ice analogs

In modeling cometary ice, the properties of clathrate hydrates were used to explain anomalous gas release at large radial distances from the Sun, and the retention of particular gas inventories at elevated temperatures. Clathrates may also have been important early in solar system history. However, there has never been a reasonable mechanism proposed for clathrate formation under the low pressures typical of these environments. For the first time, it was shown that clathrate hydrates can be formed by warming and annealing amorphous mixed molecular ices at low pressures. The complex microstructures which occur as a result of clathrate formation from the solid state may provide an explanation for a variety of unexplained phenomena. The vacuum and imaging systems of an Hitachi H-500H Analytical Electron Microscope was modified to study mixed molecular ices at temperatures between 12 and 373 K. The resulting ices are characterized by low-electron dose Transmission Electron Microscopy (TEM) and Selected Area Electron Diffraction (SAED). The implications of these results for the mechanical and gas release properties of comets are discussed. Laboratory IR data from similar ices are presented which suggest the possibility of remotely observing and identifying clathrates in astrophysical objects

Methanol in the sky with diamonds

The present of gas phase methanol in dense interstellar molecular clouds was established by radio detection of its rotational emission lines. However, the position, width, and profile of a absorption band near 1470 cm(exp -1) in the IR spectra of many dense molecular clouds strongly suggests that solid methanol is an important component of interstellar ices. In an attempt to better constrain the identification of 1470 cm(exp -1) feature, we began a program to search for other characteristic absorption bands of solid state methanol in the spectra of objects known to produce this band. One such feature is now identified in the spectra of several dense molecular clouds and its position, width, and profile fit well with those of laboratory H2O:CH3OH ices. Thus, the presence of methanol-bearing ices in space is confirmed