Structures in Other Domains The methodology of structural analysis discussed in this article has been applied beyond the narrow realm of natural language syntax that we have discussed in this article. Within the study of language, similar methods of analysis have been pervasively applied to the study of sounds (phonology), words (morphology), and meanings (semantics), yielding a range of of abstract structural representations whose properties bear considerable explanatory burden. There are a wealth of cases in each of these domains analogous to those discussed here, though space prevents us from going in these (see Akmajian, Demers, Farmer and Harnish 1995 for a traditional overview, and Jackendo 1994 for one more focused on connections with cognitive science). Additionally, these representations have shed substantial light on the processes of language acquisition and language change. It has been found that variation in the types of sentences that are used, whether during the course of children's acquisition of their native languages or in the centuries-long periods of linguistic change, are best characterized not as super cial and haphazard alterations, but rather in terms of parametric modi cations to the fundamental underlying grammatical rules and constraints. Moving outside the domain of language, one application of these same methods has been in the study of music cognition. Just as the representations of linguistic theory arise out of an attempt to model speakers' intuitions about well-formedness and possible meanings of the sentences of their

Structural analysis

Wearable electronics is expected to be one of the most active research areas in the next decade; therefore, nanomaterials possessing high carrier mobility, optical transparency, mechanical robustness and flexibility, lightweight, and environmental stability will be in immense demand. Graphene is one of the nanomaterials that fulfill all these requirements, along with other inherently unique properties and convenience to fabricate into different morphological nanostructures, from atomically thin single layers to nanoribbons. Graphene-based materials have also been investigated in sensor technologies, from chemical sensing to detection of cancer biomarkers. The progress of graphene-based flexible gas and chemical sensors in terms of material preparation, sensor fabrication, and their performance are reviewed here. The article provides a brief introduction to graphene-based materials and their potential applications in flexible and stretchable wearable electronic devices. The role of graphene in fabricating ...

Flexible Graphene-Based Wearable Gas and Chemical Sensors

Susan Goethel Campbell’s exhibition Field Guide explores the nature of art and the conceptual process through a multimedia installation that also reflects upon temporality, art history, ecology and science. Introduced with a time-lapse video of weather patterns captured by web cam over the course of an entire year, atmospheric effects assume the quality of translucent washes that blur distinctions between opacity and transparency, painting and technology. Aerial views of built environments set against expansive cityscapes present essential imagery for large-format digital woodblock prints realized in monochromatic tonals and saturated grids of yellow and blazing orange. Some combine undulating wood grain patterns with pinhole perforations to admit light; others consist of diaphanous walnut stains applied to hand-crafted paper, a self-referential allusion to art’s planarity and permeable membrane. The evanescence of these views is echoed in pristine impressions of filtered dust and shimmering milkweed assemblages contained in Plexiglas light boxes. Known as Asclepias, milkweed is an herbaceous flower named by Carl Linnaeus after Asclepius, the Greek god of healing, due to its efficacious medicinal powers. Like the weather, the milkweed’s reflective silver filaments respond to shifting currents of air paired with gently wafted treetops projected in the viewing room. Here pearls of light corresponding to the spheres and pinpricks of the prints on the walls float randomly over the fictitious frame of a cubical vitrine. Orbs appear and disappear amid nocturnal shadows as figments of the imagination, their languid dispersion eliciting not-ofthis-world sensations of suspension, ascent and transcendence. This joined to the mesmerizing stillness of a gallery pierced occasionally by the sound of supersonic aircraft, a reminder of the machine in the garden. Beyond, the history of landscape photography and the Romantic sublime are encoded in works titled “Old Stand” that render minuscule figures of stationary box photographers against the grandeur of ice-capped Rockies. In some of the works the human figure is effaced as a historical memory through exquisitely modulated rubbings whose unbounded spatiality contrasts with the reflexive interiority of the viewing room. Campbell’s incandescent vision of nature asserts the phenomenal power of art to elevate the human spirit in the presence of heart-stirring beauty. It dares to reaffirm the timeless union between the material and immaterial substance of the universe, between human life and the ephemera of the natural world. f i l m

The Conscious Mind

An ultrasensitive humidity sensor based on molybdenum-disulfide- (MoS2)-modified tin oxide (SnO2) nanocomposite has been demonstrated in this work. The nanostructural, morphological, and compositional properties of an as-prepared MoS2/SnO2 nanocomposite were characterized by scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray diffraction (XRD), energy dispersive spectrometry (EDS), nitrogen sorption analysis, and Raman spectroscopy, which confirmed its successful preparation and rationality. The sensing characteristics of the MoS2/SnO2 hybrid film device against relative humidity (RH) were investigated at room temperature. The RH sensing results revealed an unprecedented response, ultrafast response/recovery behaviors, and outstanding repeatability. To our knowledge, the sensor response yielded in this work was tens of times higher than that of the existing humidity sensors. Moreover, the MoS2/SnO2 hybrid nanocomposite film sensor exhibited great enhancement in humidity sensi...

Facile Fabrication of MoS2-Modified SnO2 Hybrid Nanocomposite for Ultrasensitive Humidity Sensing

The demand for portable gas sensors is increasing following the progress in the electronics industry; there is an equal need to increase the quality of gas sensors. Spinel ferrites have been used as electronic materials for more than 50 years and offer a suitable ceramic base for the gas sensor market. They are simple, low cost, and compared to other gas sensors have structural and compositional versatility. This review highlights the recent developments and shows the potential of the spinel ferrites on gas sensor technology. Sensing mechanisms for a range of gasses and humidity are explained for n-type, p-type, mixed and substituted spinel ferrite gas sensors. The change in conduction mechanism is discussed outlining electronic and chemical sensitization that both increase the conductivity. Some cation substitutions are shown to change the oxidation state, thereby increasing sensitivity, but noble metals are shown to chemically sensitize spinel ferrites. This review surveys synthesis methods for producing spinel ferrites and discusses future prospects for further improvements.

Spinel ferrite oxide semiconductor gas sensors

NiO–SnO 2 ceramic nanofibers have been fabricated by electrospinning technique and characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM) and fluorescence spectra. XRD data revealed that NiO–SnO 2 nanofibers with pure tetragonal rutile structure for SnO 2 and cubic phase corresponding for NiO structure were obtained. The emission characteristics are determined by structural defects and oxygen vacancies and depend on the nickel level in nanofibers. The humidity sensing properties of the nanofibers were tested by electrical measurements by varying the relative humidity from 0 to 100%. The electrical resistivity of samples decreases on the whole humidity range. The electrical investigation under humidity influence showed that NiO–SnO 2 nanofibers can be used as active nanostructures for humidity sensors.

Microstructure, electrical and humidity sensor properties of electrospun NiO–SnO2 nanofibers

Reduced graphene oxide decorated with Fe doped SnO 2 nanoparticles for humidity sensor

Ni ferrite highly organized as humidity sensors

Humidity sensor applicative material based on copper-zinc-tungsten spinel ferrite

Influence of partial substitution of Fe3+ with W3+ on the microstructure, humidity sensitivity, magnetic and electrical properties of barium hexaferrite

Iulian Petrila

Papers

Microstructure, electrical and humidity sensor properties of electrospun NiO–SnO2 nanofibers

Reduced graphene oxide decorated with Fe doped SnO 2 nanoparticles for humidity sensor

Ni ferrite highly organized as humidity sensors

Humidity sensor applicative material based on copper-zinc-tungsten spinel ferrite

Influence of partial substitution of Fe3+ with W3+ on the microstructure, humidity sensitivity, magnetic and electrical properties of barium hexaferrite