523 research outputs found
Traditional Wooden Buildings in China
Chinese ancient architecture, with its long history, unique systematic features and wide-spread employment as well as its abundant heritages, is a valuable legacy of the whole world. Due to the particularity of the material and structure of Chinese ancient architecture, relatively research results are mostly published in Chinese, which limits international communication. On account of the studies carried out in Nanjing Forestry University and many other universities and teams, this chapter emphatically introduces the development, structural evolution and preservation of traditional Chinese wooden structure; research status focuses on material properties, decay pattern, anti-seismic performance and corresponding conservation and reinforcement technologies of the main load-bearing members in traditional Chinese wooden structure
Predicting financial extremes based on weighted visual graph of major stock indices
Understanding and predicting extreme turning points in the financial market, such as financial bubbles and crashes, has attracted much attention in recent years. Experimental observations of the superexponential increase of prices before crashes indicate the predictability of financial extremes. In this study, we aim to forecast extreme events in the stock market using 19-year time-series data (January 2000– December 2018) of the financial market, covering 12 kinds of worldwide stock indices. In addition, we propose an extremes indicator through the network, which is constructed from the price time series using a weighted visual graph algorithm. Experimental results on 12 stock indices show that the proposed indicators can predict financial extremes very well
Effect of Xinyue capsules on patients with coronary heart disease after percutaneous coronary intervention: study protocol for a randomized controlled trial
Case report form 2014.3.4R2. (PDF 1119 kb
Improving mobility of silicon metal-oxide-semiconductor devices for quantum dots by high vacuum activation annealing
To improve mobility of fabricated silicon metal-oxide-semiconductor (MOS)
quantum devices, forming gas annealing is a common method used to mitigate the
effects of disorder at the Si/SiO2 interface. However, the importance of
activation annealing is usually ignored. Here, we show that a high vacuum
environment for implantation activation is beneficial for improving mobility
compared to nitrogen atmosphere. Low-temperature transport measurements of Hall
bars show that peak mobility can be improved by a factor of two, reaching 1.5
m^2/(Vs) using high vacuum annealing during implantation activation. Moreover,
the charge stability diagram of a single quantum dot is mapped, with no visible
disturbance caused by disorder, suggesting possibility of fabricating
high-quality quantum dots on commercial wafers. Our results may provide
valuable insights into device optimization in silicon-based quantum computing.Comment: 13 pages, 4 figure
Theory of Second-Order Topological Superconductors
Topological superconductors are a class of unconventional superconducting
materials featuring sub-gap zero-energy Majorana bound modes that hold promise
as a building block for topological quantum computing. In this work, we study
the realization of second-order topology that defines anomalous gapless
boundary modes in a two-orbital superconductor with spin-orbital couplings. We
reveal a time-reversal symmetry-breaking second-order topological
superconducting phase with -wave orbital-dependent paring without the
need for the external magnetic field. Remarkably, this orbital-active -wave
paring gives rise to anomalous zero-energy Majorana corner modes, which is in
contrast to conventional chiral -wave pairing, accommodating one-dimensional
Majorana edge modes. Our work not only reveals a unique mechanism of
time-reversal symmetry breaking second-order topological superconductors but
also bridges the gap between second-order topology and orbital-dependent
pairings.Comment: 5+ pages, 5 figure
Traffic experiment reveals the nature of car-following
As a typical self-driven many-particle system far from equilibrium, traffic
flow exhibits diverse fascinating non-equilibrium phenomena, most of which are
closely related to traffic flow stability and specifically the
growth/dissipation pattern of disturbances. However, the traffic theories have
been controversial due to a lack of precise traffic data. We have studied
traffic flow from a new perspective by carrying out large-scale car-following
experiment on an open road section, which overcomes the intrinsic deficiency of
empirical observations. The experiment has shown clearly the nature of
car-following, which runs against the traditional traffic flow theory.
Simulations show that by removing the fundamental notion in the traditional
car-following models and allowing the traffic state to span a two-dimensional
region in velocity-spacing plane, the growth pattern of disturbances has
changed qualitatively and becomes qualitatively or even quantitatively in
consistent with that observed in the experiment.Comment: 24 pages, 7 figure
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