ISSN 0253-2778

CN 34-1054/N

2020 Vol. 50, No. 5

Display Method:
Original Paper
Analysis of heat transfer characteristics of an air jet cooling a conical heat sink
LI Hai, TANG Zhiguo, GAO Qing, ZHANG Feng, SONG Anqi
2020, 50(5): 551-558. doi: 10.3969/j.issn.0253-2778.2020.05.001
Abstract:
The heat transfer characteristics of a single air jet to cool conical heat sinks with different conical angles were studied by numerical simulation. The Transition SST turbulence model was adopted to solve the Navier-Stokes equation. The difference of heat transfer between different locations was an...
Spatial distributions of oceanic non-precipitating warm clouds and in-cloud vertical structures of liquid water content as revealed by CloudSat measurements
WEI Junbo, DING Yuhao, LAO Ping, LIU Qi
2020, 50(5): 559-569. doi: 10.3969/j.issn.0253-2778.2020.05.002
Abstract:
Using cloud profile radar (CPR/CloudSat) data from 2007 to 2009, the horizontal distributions of non-precipitating warm clouds over global oceans were examined and the vertical variation characteristics of LWC (liquid water content) were analyzed for four major warm cloud types, i.e., cumulus (Cu), ...
Energy and exergy analyses of seawater desalination system based on absorption heat transformer driven by solar energy
LU Dunfang, HU Peng
2020, 50(5): 570-575. doi: 10.3969/j.issn.0253-2778.2020.05.003
Abstract:
The absorption heat transformer (AHT) can raise the temperature of low-temperature thermal energy. In this study, a seawater desalination system was developed based on the AHT driven by solar energy, where AHT was used to raise the temperature of the solar collector heat source to heat and evaporate...
Some characterizations for the exponential φ-expansiveness of linear skew-product semiflows
YUE Tian, SONG Xiaoqiu
2020, 50(5): 576-580. doi: 10.3969/j.issn.0253-2778.2020.05.004
Abstract:
The exponential φ-expansiveness of linear skew-product semiflows in Banach space was studied. Based on the definition of uniform exponential expansiveness, a linear skew-product semiflow with exponential φ-expansiveness was presented. Some characterizations for exponential φ-expansiveness were...
Optimal pricing and advertising strategy concern the bilateral spillover effect of advertising investment
XIA Tian, YANG Feng
2020, 50(5): 581-588. doi: 10.3969/j.issn.0253-2778.2020.05.005
Abstract:
Assuming the firm is highly responsive and has cost advantages and is thus capable of entering the market at the same time as the manufacturer by producing a similar version of the manufacturer’s new product. The impact of this mechanism on the two firms is studied through the bilateral spillover ef...
Sparse-Lagrangian FDF simulation of Sandia flame E with modified density coupling
HUANG Lihang, ZHU Minming, YE Taohong
2020, 50(5): 589-595. doi: 10.3969/j.issn.0253-2778.2020.05.006
Abstract:
Sparse-Lagrangian filtered density function (FDF) simulation is performed for Sandia flame E. Sparse-Lagrangian Monte Carlo method is used to solve the scalar FDF transport equations, in which a generalized multiple mapping conditioning (MMC) model is implemented to enforce mixing localness. A modif...
A multi-view based semi-supervised classifier with co-regularization for imbalanced data
CUI Wenquan, CHEN Wei, CHENG Haoyang
2020, 50(5): 596-604. doi: 10.3969/j.issn.0253-2778.2020.05.007
Abstract:
A method of constructing a multi-view semi-supervised learning classifier was presented for manifold learning and multi-puncture processing. The multi-view and semi-supervised learning of the data is achieved through recursive optimization, and appropriate labeling and equalization processing, until...
Separation and purification to prepare N-acetylneuraminic acid after oxalic acid hydrolysis of polysialic acid
WU Zhibo, CHEN Xiangsong, WU Jinyong, SUN Lijie, YUAN Lixia, YAO Jianming
2020, 50(5): 605-611. doi: 10.3969/j.issn.0253-2778.2020.05.008
Abstract:
The polysialic acid was obtained from fermentation of escherichia coli, and hydrolyzed to separate, purify and prepare the N-acetylneuraminic acid. In order to study the process conditions of separation and purification to prepare high purity of n-acetylneuraminic acid from the polysialic acid whi...
Dynamic dependence of return and volatility between BRICS stock markets based on TV-Copula-X model
YE Wuyi, DING Yalin, JIAO Shoukun
2020, 50(5): 612-628. doi: 10.3969/j.issn.0253-2778.2020.05.009
Abstract:
The TV-Copula-X model was constructed with the addition of an exogenous variable the dynamic Copula function. Based on the definition of ‘volatility surprise’, the dependence structures of the BRICS were studied from the perspectives of mean spillover and volatility spillover, and whether the struct...
Dissociative photoionization of dimethyl ether in the energy range of 13.3~14.3 eV
XU Lei, WU Xiangkun, YU Tongpo, ZHOU Xiaoguo, LIU Shilin
2020, 50(5): 629-636. doi: 10.3969/j.issn.0253-2778.2020.05.010
Abstract:
Dissociative photodissociation of dimethyl ether in the photon energy of 13.30~14.30 eV was studied using threshold photoelectron photoion coincidence mass spectrometry, combined with photoionization using a vacuum ultraviolet light source from synchrotron radiation. In this range, the dimethyl ethe...
The kinetic mechanism of H+ in lysozyme with increasing temperature
LI Mengna
2020, 50(5): 637-644. doi: 10.3969/j.issn.0253-2778.2020.05.011
Abstract:
In this study, Raman spectroscopy was employed to study the kinetic mechanism of lysozyme denaturation at high temperatures induced by
Thermal behavior analysis of 21700 type lithium ion battery during charge-discharge cycles based on electrochemical-thermal model
XU Wenjun, HU Peng
2020, 50(5): 645-653. doi: 10.3969/j.issn.0253-2778.2020.05.012
Abstract:
Lithium ion batteries have become a hotspot in the field of electric vehicles due to their excellent performance of high specific energy, long lifespan, high output power, and wide range of charge-discharge rates. The thermal behavior of the batteries during the charge-discharge cycle has a large im...
Risk measurement and backtesting of financial market based on E-GAS-AST model
XIA Yimeng, CHEN Yu
2020, 50(5): 654-668. doi: 10.3969/j.issn.0253-2778.2020.05.013
Abstract:
Concerning financial data's fat-tail,volatility clustering and asymmetry, we raise two data-driven models: E-GAS-AST model and E-GAS-AST-GPD model,and proceed risk measuring and backtesting with real data. Based on generalized autoregressive score(GAS) model,combining asymmetric student-t (AST) di...
Ore-type condition for loose Hamilton cycles in 3-uniform hypergraphs
YU Lei
2020, 50(5): 669-672. doi: 10.3969/j.issn.0253-2778.2020.05.014
Abstract:
A classic result of Ore in 1960 states that if the degree sum of any two independent vertices in an n-vertex graph is at least n, then the graph is Hamiltonian. Here a similar problem for 3-uniform hypergraph was studied and an approximate result was obtained.
Optimization model of correlation interval combination forecasting based on COWA operator and its approximate solutions
ZHOU Daidi, CHEN Huayou, ZHANG Qianyun, JIANG Lihui
2020, 50(5): 673-681. doi: 10.3969/j.issn.0253-2778.2020.05.015
Abstract:
On the basis of Holt exponential smoothing model, multi-layer perceptron (MLP) model and support vector machine (SVM) model, an interval optimal combination forecasting model was built by introducing the concept of COWA operator and correlation coefficient and some properties of the model were discu...
Dynamic analysis of an SIQR model with saturation contact rate and hybrid strategies
MA Yanli, CHU Zhengqing, LI Hongju
2020, 50(5): 682-687. doi: 10.3969/j.issn.0253-2778.2020.05.016
Abstract:
Considering vaccination, quarantine and elimination hybrid strategies, an SIQR epidemic model with saturation contact rate was established. And the global stability of the model was studied by means of both theoretical and numerical ways. Firstly, the threshold-basic reproductive number R0 which ...
Study on relation between wet deformation of Xuan paper and quality of mounted calligraphy and paintings
GONG Decai, ZHOU Yujun, ZHONG Jiarang, GONG Yuxuan
2020, 50(5): 688-694. doi: 10.3969/j.issn.0253-2778.2020.05.017
Abstract:
Most of the harm to the paintings and calligraphy is related to "the force". However, few studies have been reported on the research of the mechanical behavior. Xuan paper is a primary material of the mounting of Chinese paintings and calligraphy. Dimensional variation occurs upon changes in its moi...
Solving multi-station refuse collection problem based on cooperative co-evolutionary algorithm
ZHANG Yuzhou, ZHANG Ziwei
2020, 50(5): 695-704. doi: 10.3969/j.issn.0253-2778.2020.05.018
Abstract:
With the continuous development of the economy and the rapid advancement of urbanization, the amount of refuse produced nationwide is rapidly increasing, and the cost for refuse processing is in turn on the rise, with refuse collection occupying an increasing proportion of it. A complex refuse colle...
3D time-domain IP forward modeling using unstructured finite element method under uneven terrain
HUANG Du, WU Xiaoping
2020, 50(5): 705-714. doi: 10.3969/j.issn.0253-2778.2020.05.019
Abstract:
It is generally believed that the undulating terrain has little influence on the induced polarization (IP) exploration, because it has no influence under the relatively ideal condition of uniform polarization of the underground medium. However, for the complex medium model with ore body under the co...