182 research outputs found
2-MethÂoxy-4-methyl-1-[1-(phenylÂsulfonÂyl)propan-2-yl]benzene
The title molÂecule, C17H20O3S, displays a U-shaped structure; the two benzene rings are nearly parallel and partially overlapped to each other, the dihedral angle and centroid-to-centroid distance being 15.0 (2)° and 3.723 (2) Å. In the crystal, weak interÂmolecular C—H⋯O hydrogen bonds link the molÂecules, forming supraÂmolecular chains running along the a axis
An Integrated analysis of structural safety, embodied carbon, and construction cost in a prefabricated Chinese timber house within a BIM-based environment
The timber building has received increasing attention in building industry due to its benefits to environmental resilience. This study presents a BIM-based integrated analysis in a new prefabricated timber house in northern China, considering seismic performance, construction material use/cost, and embodied carbon emission. Three new structure solutions were analysed in comparison with the conventional model. It can be found from the cost analysis that the shortest stud spacing achieves an increase of 23.67% and the longest stud spacing has a decrease of 21.92%. For the embodied carbon, the shortest stud spacing sees a decrease of 29.21%, while an increase of 12.52% is found in the longest stud spacing
Evaluation of nano-frictional and mechanical properties of a novel Langmuir-Blodgett monolayer/self-assembly monolayer composite structure
A novel stearic acid (SA)/3-aminopropyltrethoxysilane (APS) composite
structure was fabricated using the combined method of the Langmuir-Blodgett
technique and self-assembly monolayer (SAM) technique. Its frictional, adhesive
properties and interface contact types between the atomic force microscope tip
and the samples were evaluated based on Amonton's laws and the general
Carpick's transition equation, respectively. The results showed that the
tip-sample contacts corresponded to the
Johnson-Kendall-Robert/Derjaguin-Muller-Toporov (DMT) transition model for
SiO2, APS-SAMs, and the unheated SA-APS composite structure, and for the heated
SA-APS bilayer to the DMT model. Frictional forces for the four samples were
linearly dependent on external loads at higher loads, and at lower loads they
were significantly affected by adhesive forces. Frictional and scratching tests
showed that the heated SA-APS composite structure exhibited the best
lubricating properties and adhesion resistance ability, and its wear resistance
capacity was greatly improved due to the binding-mode conversion from hydrogen
bonds to covalent bonds. Thus, this kind of composite bilayer might be
promising for applications in the lubrication of nano/microelectromechanical
systems. I.Comment: 8 pages, 8 figure
Engineering interface-type resistive switching in BiFeO3 thin film switches by Ti implantation of bottom electrodes
BiFeO3 based MIM structures with Ti-implanted Pt bottom electrodes and Au top electrodes have been fabricated on Sapphire substrates. The resulting metal-insulator-metal (MIM) structures show bipolar resistive switching without an electroforming process. It is evidenced that during the BiFeO3 thin film growth Ti diffuses into the BiFeO3 layer. The diffused Ti effectively traps and releases oxygen vacancies and consequently stabilizes the resistive switching in BiFeO3 MIM structures. Therefore, using Ti implantation of the bottom electrode, the retention performance can be greatly improved with increasing Ti fluence. For the used raster-scanned Ti implantation the lateral Ti distribution is not homogeneous enough and endurance slightly degrades with Ti fluence. The local resistive switching investigated by current sensing atomic force microscopy suggests the capability of down-scaling the resistive switching cell to one BiFeO3 grain size by local Ti implantation of the bottom electrode
Exploring the Potential of Integrated Optical Sensing and Communication (IOSAC) Systems with Si Waveguides for Future Networks
Advanced silicon photonic technologies enable integrated optical sensing and
communication (IOSAC) in real time for the emerging application requirements of
simultaneous sensing and communication for next-generation networks. Here, we
propose and demonstrate the IOSAC system on the silicon nitride (SiN) photonics
platform. The IOSAC devices based on microring resonators are capable of
monitoring the variation of analytes, transmitting the information to the
terminal along with the modulated optical signal in real-time, and replacing
bulk optics in high-precision and high-speed applications. By directly
integrating SiN ring resonators with optical communication networks,
simultaneous sensing and optical communication are demonstrated by an optical
signal transmission experimental system using especially filtering amplified
spontaneous emission spectra. The refractive index (RI) sensing ring with a
sensitivity of 172 nm/RIU, a figure of merit (FOM) of 1220, and a detection
limit (DL) of 8.2*10-6 RIU is demonstrated. Simultaneously, the 1.25 Gbps
optical on-off-keying (OOK) signal is transmitted at the concentration of
different NaCl solutions, which indicates the bit-error-ratio (BER) decreases
with the increase in concentration. The novel IOSAC technology shows the
potential to realize high-performance simultaneous biosensing and communication
in real time and further accelerate the development of IoT and 6G networks.Comment: 11pages, 5 figutre
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