Experimental Study on Vertical Fire Spread of Thin Hanging Combustibles

AbstractIn order to study vertical fire spread law of thin combustibles hang in atrium, the vertical combustion characteristics of thin combustibles was tested using vertical combustion experimental equipment, limited oxygen index tester and calorific value analyzer. Combustion parameters such as oxygen index, calorific value, vertical fire spread rate, surface temperature, mass loss rate and heat release rate were obtained. Fitting line showed that vertical fire spread rate, mass loss rate and heat release rate can be expressed as a power function of burning time. Vertical fire spread was accelerated growth, which the fire spread rate is over ten times of horizontal fire spread rate. The maximum surface temperature of the combustion cotton was about 500°C, the maximum surface temperature of the combustion cardboard was about 700°C. Experimental results showed that the thin combustibles hang in atrium and other large spaces have a greater fire risk, its vertical fire spread is very fast, so fire prevention measures should be taken in practical applications

4-(4-Pentyl­cyclo­hexyl)phenol

In the title compound, C17H26O, the cyclo­hexyl ring adopts a chair conformation with the C-atom substituents in equatorial sites. The H atom of the O—H group is disordered over two positions of equal occupancy. In the crystal, O—H⋯O hydrogen bonds lead to [010] chains

Observing white dwarf tidal stripping with TianQin gravitational wave observatory

Recently discovered regular X-ray bursts known as quasi-periodic eruptions have a proposed model that suggests a tidal stripping white dwarf inspiralling into the galaxy's central black hole on an eccentric orbit. According to this model, the interaction of the stripping white dwarf with the central black hole would emit gravitational wave signals as well, their detection can help explore the formation mechanism of quasi-periodic eruptions and facilitate multi-messenger observations. In this paper, we aim to perform a preliminary study of the gravitation wave observation of TianQin on this stripping white dwarf model. We investigated the horizon distance of TianQin on this type of gravitation wave signal and found it can be set to 200Mpc. We also find that those stripping white dwarf model sources with central black hole mass within $10^4\sim10^{5.5}M_\odot$ are more likely to be detected by TianQin. We assessed the parameter estimation precision of TianQin on those stripping white dwarf model sources. Our result shows that, even in the worst case, TianQin can determine the central black hole mass, the white dwarf mass, the central black hole spin, and the orbital initial eccentricity with a precision of $10^{-2}$. In the optimistic case, TianQin can determine the central black hole mass and the white dwarf mass with a precision of $10^{-7}$, determine the central black hole spin with a precision of $10^{-5}$, and determine the orbital initial eccentricity with a precision of $10^{-8}$. Moreover, TianQin can determine the luminosity distance with a precision of $10^{-1}$ and determine the sky localization with a precision of $10^{-2}\sim10$ $\rm deg^2$.Comment: 9 pages, 4 figure

A tetra­nuclear cobalt(III) cluster with 2-(hydroxy­meth­yl)pyridine ligands

In the title compound, tetra­kis[μ3-(2-pyrid­yl)methano­lato]tetra­kis[bromido(methanol)cobalt(III)] tetra­bromide 2-(hydroxy­meth­yl)pyridine tetra­solvate dihydrate, [Co4Br4(C6H6NO)4(CH3OH)4]Br4·4C6H7NO4·2H2O, the cation comprises a [Co4O4] cubane-type core ( symmetry). The four CoIII ions and bridging O atoms from four (2-pyrid­yl)methano­late anions are located at alternating vertices of the cube, with bromide ions and methanol ligands on the exterior of the core, completing a distorted octa­hedral geometry. The structure is stablized by inter­molecular O—H⋯Br and O—H⋯O inter­actions

Model Reference Fuzzy Adaptive PID Control and Its Applications in Typical Industrial Processes

To improve the dynamic response, regulation precision and robustness of the closed-loop system, a novel two degree of freedom control method called model reference fuzzy adaptive PID (MRFA-PID) control is proposed for industrial processes. The proposed control law consists of two parts, PID controller and fuzzy logic controller. The PID controller, which is designed for the nominal plant, guarantees the basic requirement on stability and product quality. The fuzzy logic controller, as an extra degree of freedom, improves the system dynamic performance, regulation precision, and robustness to the uncertainty of the system. The effectiveness of MRFA-PID control is illustrated by its applications in some typical industrial processes. Since the proposed method need not identify the uncertain parameters of the plant, it has a very good real-time performance, and is easy to be implemented on-line

Parallel compressive super-resolution imaging with wide field-of-view based on physics enhanced network

Achieving both high-performance and wide field-of-view (FOV) super-resolution imaging has been attracting increasing attention in recent years. However, such goal suffers from long reconstruction time and huge storage space. Parallel compressive imaging (PCI) provides an efficient solution, but the super-resolution quality and imaging speed are strongly dependent on precise optical transfer function (OTF), modulation masks and reconstruction algorithm. In this work, we propose a wide FOV parallel compressive super-resolution imaging approach based on physics enhanced network. By training the network with the prior OTF of an arbitrary 128x128-pixel region and fine-tuning the network with other OTFs within rest regions of FOV, we realize both mask optimization and super-resolution imaging with up to 1020x1500 wide FOV. Numerical simulations and practical experiments demonstrate the effectiveness and superiority of the proposed approach. We achieve high-quality reconstruction with 4x4 times super-resolution enhancement using only three designed masks to reach real-time imaging speed. The proposed approach promotes the technology of rapid imaging for super-resolution and wide FOV, ranging from infrared to Terahertz

High reward enhances perceptual learning.

Studies of perceptual learning have revealed a great deal of plasticity in adult humans. In this study, we systematically investigated the effects and mechanisms of several forms (trial-by-trial, block, and session rewards) and levels (no, low, high, subliminal) of monetary reward on the rate, magnitude, and generalizability of perceptual learning. We found that high monetary reward can greatly promote the rate and boost the magnitude of learning and enhance performance in untrained spatial frequencies and eye without changing interocular, interlocation, and interdirection transfer indices. High reward per se made unique contributions to the enhanced learning through improved internal noise reduction. Furthermore, the effects of high reward on perceptual learning occurred in a range of perceptual tasks. The results may have major implications for the understanding of the nature of the learning rule in perceptual learning and for the use of reward to enhance perceptual learning in practical applications