746 research outputs found
Mate or Menace? Exploring Organizational Identity Threats in Nonprofit-Business Partnerships
Nonprofit organizations frequently engage in partnerships with profit-oriented businesses to fulfill their goals and social mission. Although nonprofit-business partnerships can benefit both parties, they are a potential source of intra-organizational controversy and conflict, especially when social objectives clash with business interests. An increasingly recognized risk of nonprofit-business partnerships lies in organizational identity threats. Adopting a sensemaking perspective, we investigate how nonprofit members make sense of nonprofit-business partnerships and how these appraisal processes influence whether they perceive these inter-organizational partnerships as organizational identity threats. Our qualitative study draws on semi-structured interviews and shows that nonprofit membersâ evaluations of partnership congruence (i.e., the perceived fit of a partnership with membersâ organizational identity expectations) and partnership relevance (i.e., the perceived meaning of a partnership for an organizationâs identity) influence whether they perceive partnerships as organizational identity threats. In doing so, we extend research on organizational identity threats (and opportunities) of nonprofit-business partnerships
East Siberian Arctic Region Expedition '92: The Laptev Sea - Its Significance for Arctic Sea-Ice Formation and Transpolar Sediment Flux
Darin enthalten:
Expedition to Novaja Zemlja and Franz Josef Land with RV "Dalnie Zelentsy" / by D. NĂŒrnberg and E. Groth, pp. 45-7
Customized television: Standards compliant advanced digital television
This correspondence describes a European Union supported collaborative project called CustomTV based on the premise that future TV sets will provide all sorts of multimedia information and interactivity, as well as manage all such services according to each userâs or group of userâs preferences/profiles. We have demonstrated the potential of recent standards (MPEG-4 and MPEG-7) to implement such a scenario by building
the following services: an advanced EPG, Weather Forecasting, and Stock Exchange/Flight Information
Digital signal processing techniques for laser-doppler anemometry
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Aeronautics and Astronautics, 1990.Includes bibliographical references (p. 102-105).by Patrick P. Erk.M.S
Conspicuous Smooth and White Egg-Shaped Sulfur Structures on a Deep-Sea Hydrothermal Vent Formed by Sulfide-Oxidizing Bacteria
Conspicuous egg-shaped, white, and smooth structures were observed at a hydrothermal vent site in the Guaymas Basin, Gulf of California. The gelatinous structures decomposed within hours after sampling. Scanning electron microscopy (SEM) and light microscopy showed that the structure consisted of filaments of less than 0.1 mm thickness, similar to those observed for "Candidatus Arcobacter sulfidicus." SEM-energy-dispersive X-ray spectroscopy (EDS) showed that the filaments were sulfur rich. According to 16S rRNA gene amplicon and fluorescence in situ hybridization (FISH) analyses, Arcobacter, a sulfide oxidizer that is known to produce filamentous elemental sulfur, was among the dominant species in the structure and was likely responsible for its formation. Arcobacter normally produces woolly snowflake like structures in opposed gradients of sulfide and oxygen. In the laboratory, we observed sulfide consumption in the anoxic zone of the structure, suggesting an anaerobic conversion. The sulfide oxidation and decomposition of the structure in the laboratory may be explained by dissolution of the sulfur filaments by reaction with sulfide under formation of polysulfides. IMPORTANCE At the deep-sea Guaymas Basin hydrothermal vent system, sulfide-rich hydrothermal fluids mix with oxygenated seawater, thereby providing a habitat for microbial sulfur oxidation. Microbial sulfur oxidation in the deep sea involves a variety of organisms and processes and can result in the excretion of elemental sulfur. Here, we report on conspicuous white and smooth gelatinous structures found on hot vents. These strange egg-shaped structures were often observed on previous occasions in the Guaymas Basin, but their composition and formation process were unknown. Our data suggest that the notable and highly ephemeral structure was likely formed by the well-known sulfide-oxidizing Arcobacter. While normally Arcobacter produces loose flocs or woolly layers, here smooth gel-like structures were found
RP-LC and HPTLC Methods for the Determination of Olmesartan Medoxomil and Hydrochlorothiazide in Combined Tablet Dosage Forms
Two new, rapid, precise, accurate and specific chromatographic methods were described for the simultaneous determination of olmesartan medoxomil and hydrochlorothiazide in combined tablet dosage forms. The first method was based on reversed phase liquid chromatography using an Eurosphere 100 RP C18 column (250Â ĂÂ 4.6Â mm ID, 5Â ÎŒm). The mobile phase was methanolâ0.05% o-phosphoric acid (60:40 v/v) at a flow rate of 1.0Â mLÂ minâ1. Commercially available tablets and laboratory mixtures containing both drugs were assayed and detected using a UV detector at 270Â nm. The second method involved silica gel 60 F254 high performance thin layer chromatography and densitometric detection at 254Â nm using acetonitrileâethyl acetateâglacial acid (7:3:0.4 v/v/v) as the mobile phase. Calibration curves ranged between 200â600 and 125â375Â ng spotâ1 for olmesartan and hydrochlorothiazide, respectively
Mode-resolved reciprocal space mapping of electron-phonon interaction in the Weyl semimetal candidate Td-WTe
The selective excitation of coherent phonons provides unique capabilities to
control fundamental properties of quantum materials on ultrafast time scales.
For instance, in the presence of strong electron-phonon coupling, the
electronic band structure can become substantially modulated. Recently, it was
predicted that by this means even topologically protected states of matter can
be manipulated and, ultimately, be destroyed: For the layered transition metal
dichalcogenide Td-WTe, pairs of Weyl points are expected to annihilate as
an interlayer shear mode drives the crystalline structure towards a
centrosymmetric phase. By monitoring the changes in the electronic structure of
Td-WTe with femtosecond resolution, we provide here direct experimental
evidence that the coherent excitation of the shear mode acts on the electronic
states near the Weyl points. Band structure data in comparison with our results
imply, furthermore, the periodic reduction in the spin splitting of bands near
the Fermi energy, a distinct electronic signature of the non-centrosymmetric Td
ground state of WTe. The comparison with higher-frequency coherent phonon
modes finally proves the shear mode-selectivity of the observed changes in the
electronic structure. Our real-time observations reveal direct experimental
insights into electronic processes that are of vital importance for a coherent
phonon-induced topological phase transition in Td-WTe.Comment: 28 pages, 17 figure
A fast and intuitive method for calculating dynamic network reconfiguration and node flexibility
Dynamic interactions between brain regions, either during rest or performance of cognitive tasks, have been studied extensively using a wide variance of methods. Although some of these methods allow elegant mathematical interpretations of the data, they can easily become computationally expensive or difficult to interpret and compare between subjects or groups. Here, we propose an intuitive and computationally efficient method to measure dynamic reconfiguration of brain regions, also termed flexibility. Our flexibility measure is defined in relation to an a-priori set of biologically plausible brain modules (or networks) and does not rely on a stochastic data-driven module estimation, which, in turn, minimizes computational burden. The change of affiliation of brain regions over time with respect to these a-priori template modules is used as an indicator of brain network flexibility. We demonstrate that our proposed method yields highly similar patterns of whole-brain network reconfiguration (i.e., flexibility) during a working memory task as compared to a previous study that uses a data-driven, but computationally more expensive method. This result illustrates that the use of a fixed modular framework allows for valid, yet more efficient estimation of whole-brain flexibility, while the method additionally supports more fine-grained (e.g. node and group of nodes scale) flexibility analyses restricted to biologically plausible brain networks.</p
Ultralong Copper Phthalocyanine Nanowires with New Crystal Structure and Broad Optical Absorption
The development of molecular nanostructures plays a major role in emerging
organic electronic applications, as it leads to improved performance and is
compatible with our increasing need for miniaturisation. In particular,
nanowires have been obtained from solution or vapour phase and have displayed
high conductivity, or large interfacial areas in solar cells. In all cases
however, the crystal structure remains as in films or bulk, and the
exploitation of wires requires extensive post-growth manipulation as their
orientations are random. Here we report copper phthalocyanine (CuPc) nanowires
with diameters of 10-100 nm, high directionality and unprecedented aspect
ratios. We demonstrate that they adopt a new crystal phase, designated
eta-CuPc, where the molecules stack along the long axis. The resulting high
electronic overlap along the centimetre length stacks achieved in our wires
mediates antiferromagnetic couplings and broadens the optical absorption
spectrum. The ability to fabricate ultralong, flexible metal phthalocyanine
nanowires opens new possibilities for applications of these simple molecules
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