I n this paper, we present a robot system for inpipe inspection of underground urban gas pipelines. The robot is configured as an articulated structure like a snake with a tether cable. Two active driving vehicles are located in front and rear of the system, and passive modules such as a control module are chained between the active vehicles. The proposed robot has outstanding mobility oflered ...

We probed, in the time domain, the THz electromagnetic radiation originating from spins in CdMnTe diluted magnetic semiconductor quantum wells containing high-mobility electron gas. Taking advantage of the efficient Raman generation process, the spin precession was induced by low power near-infrared pulses. We provide a full theoretical first-principles description of spin-wave generation, spin...

nanostructures have considerably higher surface areas than their bulk counterparts; thereforesurfaces often play important, sometimes even dominant, roles in the nanostructure properties. thenanocrystalline and nanotubes have low band gaps and high carrier mobility, thus offeringappealing potential as absorption gas. interaction between methanol molecules and carbonnanotube is investigated usin...

This position paper explores privacy issues created by mobile and wireless Internet access. We consider the information about the users identity, location, and the serviced accessed that is necessarily or unnecessarily revealed observers, including the access network, intermediaries within the Internet, and the peer endpoints. In particular, we are interested in data that can be collected from ...

Dynamic changes in chromatin structure underlie much of transcriptional control in the eukaryotic nucleus. In the hope of understanding how these are effected, attention has focused on the molecular machines that reorganize chromatin. The best-defined of these machines contain members of the SWI2/SNF2 superfamily of ATPases. These enzymes use the energy of ATP hydrolysis to destabilize chromati...

Thermoelectric conversion is an energy harvesting technology that directly converts waste heat from various sources into electricity by the Seebeck effect of thermoelectric materials with a large thermopower (S), high electrical conductivity (σ), and low thermal conductivity (κ). State-of-the-art nanostructuring techniques that significantly reduce κ have realized high-performance thermoelectri...

objectives: the purpose of this study was to determine the functional mobility and balance in the elders after total hip arthroplasty in healthy coparison to elders. methods & materials: the current cross-sectional study was done on 20 patients (70.9±4.2) with hip osteoarthritis 6 months after total hip arthroplasty and 20 healthy subjects (73±5.7) as control group. patient group was assigned w...

Gas vesicles are gas-filled buoyancy organelles with walls that consist almost exclusively of gas vesicle protein A (GvpA). Intact, collapsed gas vesicles from the cyanobacterium Anabaena flos-aquae were studied by solid-state NMR spectroscopy, and most of the GvpA sequence was assigned. Chemical shift analysis indicates a coil-α-β-β-α-coil peptide backbone, consistent with secondary-structure-...