Dalian University of Technology

About: Dalian University of Technology is a education organization based out in Dalian, China. It is known for research contribution in the topics: Catalysis & Finite element method. The organization has 60890 authors who have published 71921 publications receiving 1188356 citations. The organization is also known as: Dàlián Lǐgōng Dàxué.

Mechano-acoustic sensing of physiological processes and body motions via a soft wireless device placed at the suprasternal notch

Abstract: Skin-mounted soft electronics that incorporate high-bandwidth triaxial accelerometers can capture broad classes of physiologically relevant information, including mechano-acoustic signatures of underlying body processes (such as those measured by a stethoscope) and precision kinematics of core-body motions. Here, we describe a wireless device designed to be conformally placed on the suprasternal notch for the continuous measurement of mechano-acoustic signals, from subtle vibrations of the skin at accelerations of around 10−3 m s−2 to large motions of the entire body at about 10 m s−2, and at frequencies up to around 800 Hz. Because the measurements are a complex superposition of signals that arise from locomotion, body orientation, swallowing, respiration, cardiac activity, vocal-fold vibrations and other sources, we exploited frequency-domain analysis and machine learning to obtain—from human subjects during natural daily activities and exercise—real-time recordings of heart rate, respiration rate, energy intensity and other essential vital signs, as well as talking time and cadence, swallow counts and patterns, and other unconventional biomarkers. We also used the device in sleep laboratories and validated the measurements using polysomnography. A wireless device designed to be conformally placed on the suprasternal notch can continuously provide real-time information of essential vital signs as well as talking time, swallow counts and sleep patterns.

Facile fabrication of MWCNT-doped NiCoAl-layered double hydroxide nanosheets with enhanced electrochemical performances

Abstract: Ternary-component NiCoAl-layered double hydroxide nanosheets (NiCoAl-LDH) and multiwall carbon nanotube (MWCNT) nanohybrids (NiCoAl-LDH–MWCNT) have been successfully fabricated by a facile yet simple urea precipitation method. The MWCNTs are well incorporated into the network of NiCoAl-LDH nanosheets to form homogeneous nanohybrid materials. The electrochemical performances of nanohybrids as pseudocapacitor electrode materials were measured and investigated by cyclic voltammetry (CV) and galvanostatic charge and discharge techniques. It was found that the electrochemical performances of NiCoAl-LDH nanosheets are enhanced by the incorporation of MWCNTs into the sheet-shaped NiCoAl-LDH network. The specific capacitance of NiCoAl-LDH–MWCNT nanohybrids reaches 1035 F g−1 at a current density of 1 A g−1, and keeps a value of 597 F g−1 with a 57.7% capacitance retention rate even at a current density of 10 A g−1, which increases by 33.3% in comparison to that of the pristine NiCoAl-LDH nanosheets.

Entropy optimization of scale-free networks’ robustness to random failures

Abstract: Many networks are characterized by highly heterogeneous distributions of links which are called scale-free networks, and the degree distributions follow p ( k ) ∼ ck - α . We study the robustness of scale-free networks to random failures from the character of their heterogeneity. Entropy of the degree distribution can be an average measure of a network's heterogeneity. Optimization of scale-free networks’ robustness to random failures with average connectivity constant is equivalent to maximizing the entropy of the degree distribution. By examining the relationship of the entropy of the degree distribution, scaling exponent and the minimal connectivity, we get the optimal design of scale-free networks to random failures. We conclude that the entropy of the degree distribution is an effective measure of network's resilience to random failures.