Recently, wireless sensor networks have been widely discussed in many applications. In this paper, we propose a novel 3D emergency service that aims to guide people to safe places when emergencies happen. At normal time, the network is responsible for monitoring the environment. When emergency events are detected, the network can adaptively modify its topology to ensure transportation reliability, quickly identify hazardous regions that should be avoided, and find safe navigation paths that can lead people to exits. In particular, the structures of 3D buildings are taken into account in our design. Simulation results shows that our protocols can adapt emergencies quickly at low message cost and can find safer paths to exits than existing results.
We report a two-step dip-coating approach for the fabrication of self-assembled monolayers of platinum nanocrystals (SAM-Pt) with a particle size of B3 nm and that are uniformly deposited on a transparent conducting oxide (TCO) surface to serve as a counter electrode (CE) for dye-sensitized solar cells (DSSCs). In the first step, we prepared a polyol solution containing H 2 PtCl 6 and ethylene glycol at 110 1C, in which the reduction kinetics were controlled by adding various proportions of NaOH. In the second step, we immersed a thiol-modified TCO substrate into the polyol solution with monodispersed Pt nanoparticles prepared at pH 3.7 at approximately 295 K to complete the nanofabrication. The DSSC devices using Z907 dye as a photosensitizer and the CE prepared using this SAM-Pt approach attained notable photovoltaic performance (Z ¼ 9.2%) comparable with those fabricated using a conventional thermal decomposition method (Z ¼ 9.1%) or a cyclic electrodeposition method (Z ¼ 9.3%) under the same experimental conditions. We emphasize that the SAM-Pt films feature a clean surface, uniform morphology, narrow size distribution, small Pt loading and great catalytic activity; the present approach is hence not only suitable for DSSCs but also applicable for many other energy-related applications that require platinum as an efficient catalyst.
A method for the synthesis of substituted quinolizinium salts from 2-ethylpyridines and alkynes is demonstrated. The transformation is conveniently achieved using 1 mol % of a Rh(III) catalyst along with an excess amount of copper(II) salt. The reaction gives high product yields with broad substrate scope and functional group tolerance. Detailed mechanistic studies suggest that 2-vinylpyridine is formed in situ from 2-ethylpyridine by a copperpromoted C(sp 3 )−H hydroxylation, followed by dehydration. Later, a Rh(III)-catalyzed pyridine-directed vinylic C(sp 2 )−H activation and annulation with alkynes provided the final product.
Power saving and query processing are two major concerns in a wireless sensor network. Each of these two issues has been intensively studied separately in the literature. In this work, we are interested in linking the asynchronous power-saving protocol and the continuous query-processing problem together. A cross-layer solution is proposed. On the MAC layer, we propose to use the grid-quorum system [25] to serve as the underlying power-saving framework. On the network layer, we propose to find query paths based on the power cost incurred by grid quorums used by nodes along a path. We show how these two layers interwork with each other to support continuous queries in an energy-efficient way.
Cell migration is
crucial in physiological and pathological processes such as embryonic
development and wound healing; such migration is strongly guided by
the surrounding nanostructured extracellular matrix. Previous studies
have extensively studied the cell migration on anisotropic nanotopographic
surfaces; however, only a few studies have reported cell migration
on isotropic nanotopographic surfaces. We herein, for the first time,
propose a novel concept of adherable area on cell migration using
isotropic nanopore surfaces with sufficient nanopore depth by adopting
a high aspect ratio. As the pore size of the nanopore surface was
controlled to 200, 300, and 400 nm in a fixed center-to-center distance
of 480 nm, it produced 86, 68, and 36% of adherable area, respectively,
on the fabricated surface. A meticulous investigation of the cell
migration in response to changes in the constrained adherable area
of the nanotopographic surface showed 1.4-, 1.5-, and 1.6-fold increase
in migration speeds and a 1.4-, 2-, and 2.5-fold decrease in the number
of focal adhesions as the adherable area was decreased to 86, 68,
and 36%, respectively. Furthermore, a strong activation of FAK/Rac1
signaling was observed to be involved in the promoted cell migration.
These results suggest that the reduced adherable area promotes cell
migration through decreasing the FA formation, which in turn upregulates
FAK/Rac1 activation. The findings in this study can be utilized to
control the cell migration behaviors, which is a powerful tool in
the research fields involving cell migration such as promoting wound
healing and tissue repair.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.