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Table of Content
25 July 2020, Volume 59 Issue 4
Previous Issue
Research progress on
Pithecellobium clypearia
as antibiotic adjuvants
LIU Chong, WANG Yonggang, LI Peibo, PENG Wei, SU Weiwei
2020, 59(4): 16. doi:
10.13471/j.cnki.acta.snus.2020.04.09.2020E008
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In recent years, our team has been committed to the research of new functions of traditional Chinese medicine, and systematically screened Chinese medicines and identified
Pithecellobium clypearia
with significant antibiotic synergistic effect, which has the potential to be used as an antibiotic adjuvant. In this review, we summarized the current situation of bacterial antibiotic resistance, the research progress of antibiotic adjuvant, and the research progress of
Pithecellobium clypearia
as antibiotic adjuvant to provide the reference for the further investigation and development of this herbal plant.
Molecular cloning and expression analysis of heat shock protein
90
β cDNA in jade perch (
Scortum barcoo
)
GAO Songze, SUN Caiyun, WU Jinying, YE Hangyu, LI Wensheng
2020, 59(4): 718. doi:
10.13471/j.cnki.acta.snus.2019.10.18.2019E026
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Heat shock proteins (HSPs) play important roles in fish stress and immune response, and HSP90β is an important member of the HSPs family. In the present study, to investigate the possible role of HSP90β in the immune response, the fulllength cDNA sequence of
HSP90β
was first cloned from jade perch (
Scortum barcoo
). The size of the fulllength cDNA of jade perch
HSP90β
is 2 708 bp, of which 5' UTR is 86 bp, 3' UTR is 444 bp, and ORF is 2 178 bp, which encodes 725 amino acids. The molecular weight of jade perch HSP90β is predicted as 83 200. And this protein owns five characteristic sequences of the HSP90 family. Moreover, it has no signal peptide and transmembrane domain. Phylogenetic analysis showed that the amino acid sequence identity of jade perch HSP90β is more than 90% with those of other fishes. Under normal circumstances, the
HSP90β
mRNA of jade perch is mainly expressed in the liver. After infection with
Streptococcus agalactiae
, the
HSP90β
mRNA expression decreased first and then increased in liver. Differently, it increased first and then decreased in spleen, head kidney and brain. This result suggests that the HSP90β may be involved in the immune response elicited by
S. agalactiae
infection in jade perch.
Pyrone metabolites of a mangrove endophytic fungus
Aspergillus fumigatus
SAS
10
isolated from Dongzhai Harbor, Hainan
GUO Siyu, ZOU Tingguang, ZHU Jinglin, LIN Huimei, XU Wanyi, HUANG Hongbo, TAO Yiwen
2020, 59(4): 1923. doi:
10.13471/j.cnki.acta.snus.2020.01.09.2020E001
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The mangrove endophytic fungus
Aspergillus fumigatus
SAS10 from
Sonneratia apetala
of Dongzhai haror in Hainan was fermented by using rice medium. The extract of fermentation culture was subjected to column chromatography on silica gel, column chromatography on Sephadex LH20, and semipreparative HPLC. Seven compounds were obtained.By analyzing mass and NMR spectroscopic data, their structures were identified as aspergyllone (
1
), (
R
)2(hydroxy(phenyl)methyl)

4H

pyran

4

one (
2
), carbonarone A (
3
), campyrone A (
4
), campyrone C (
5
), asperfurandione A (
6
) and dibutylterephthalate (
7
), respectively. All of compounds obtained are reported firstly from secondary metabolites of the mangrove endophytic fungus
Aspergillus fumigatus
.
Mechanism of IBU damage induced by hydroxyl free radicals extracting Pisopropyl phenylH in water/liquid phase environment
LI Bing, ZHUANG Yan, WU Zihao, MA Hongyuan, PAN Yu, MEI Zemin, WANG Zuocheng
2020, 59(4): 2432. doi:
10.13471/j.cnki.acta.snus.2019.12.11.2019C013
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The title reaction was investigated in this paper. The dispersion corrected density functional method (WB97XD) was applied, together with perturbation theory (MP2 method) and solvation model density (SMD) model based on self consistent reaction field theory. The study showed that benzene ringH, methyleneH and methenylH abstraction by hydroxyl radicals can all induce ibuprofen molecule damage. The calculation of potential energy surface showed that the energy barrier of benzene ringH abstraction by hydroxyl radicals at different positions was nearly the same with the values of ~123.0 kJ/mol, and the damaged ibuprofen molecule could be repaired. The energy barrier of methyleneH abstraction of hydroxyl radicals at different positions was almost the same, ~100.0 kJ/mol, and the damaged ibuprofen molecule was difficult to be repaired. Furthermore, the energy barrier of methenylH abstraction by hydroxyl radicals was 68.4 kJ/mol, and the damaged ibuprofen molecule cannot be repaired. The results showed that the reaction of ibuprofen molecule damage induced by methyleneH abstraction by hydroxyl radicals had an absolute advantage.
Empirical diagnostic analysis on spatial and temporal variations ofdroughts in the Pearl River basin,
China
CHEN Zishen
2020, 59(4): 3342. doi:
10.13471/j.cnki.acta.snus.2019.09.22.2019D038
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Based on the multiple time scale index of standardization evaporation(SPEI) in the Pearl River basin from 1961 to 2011, the spatial structure distribution and temporal variation characteristics of drought in the Pearl River basin were analyzed by using the methods of rotating empirical orthogonal function decomposition, trend and mutation tests, wavelet spectral and wavelet global coherence spectral analysis. The results show that: 1) The spatial distribution and temporal variation of drought in the Pearl River basin are significantly different in the past 50 years; the number of drought events has been increasing since the 1970s. The duration and intensity of drought events in the Pearl River basin have increased significantly since the 21st century. 2) According to SPEI's REOF spatial decomposition, the Pearl River basin can be divided into 6 spatial modes, and the load centers are located in the south Guizhou and east Yunnan of the Dongjiang river basin in the north Guangxi, the southeast Guangxi, the southwest Guangxi, and the south Guizhou and the east Yunnan, respectively. There is a general drought trend in each region. The southern Guizhou and eastern Yunnan have become the drought center of the Pearl River basin. 3) The wetdry variation in six zones has an oscillation period of 28 year El Nino variation. Some regions show 11 year and 22 year change periods associated with sunspot activities, and the response of each region to ENSO events is significantly different.
The spatial differentiation of industry and its evolution mechanism in Guangzhou during
1996

2013
XU Qiying, ZHOU Chunshan, YE Changdong, NI Fangzhou
2020, 59(4): 4355. doi:
10.13471/j.cnki.acta.snus.2019.10.07.2019D042
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The industrial spatial differentiation of Guangzhou is analyzed based on the data of surveys of economy in 2008 and 2013, by using factor analysis and clustering analysis. Then the results are compared with previous findings based on similar data in 1996, 2001, and 2004, in order to derive the evolution process and mechanism of the industry in Guangzhou. The results show that: 1) The industry in Guagnzhou showed progresive decline of main urban industrial areas, sluggish differentiation of comprehensive industrial areas, transfer to periphery of special industrial areas, and the upgrading transformation of rural industrial areas. 2) There are five kinds of patterns of the industrial space differentiation process in Guangzhou, which are the declining pattern of the old industrial areas with production factors evacuating, the preserving pattern of the central industrial areas with capital support, the sustained development pattern of the suburban advanced industrial areas with industrial upgrading, the slack pattern of the peripheral comprehensive industrial areas with path dependence, the saltatory pattern of the outer suburban emerging industrial areas relying on large projects. 3) The administrative mechanism, market mechanism and industrial base together contribute to the differentiation patterns in Guangzhou.
Hyperspectral estimation of soil salt content in lake oasis on the west bank of Bosten lake
ZHAO Hui, LI Xinguo, JIN Wangui, Mamattursun·Eziz , NIU Fangpeng
2020, 59(4): 5663. doi:
10.13471/j.cnki.acta.snus.2019.09.20.2019D037
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Taking the soil salinity and corresponding hyperspectral data of the lakeside oasis on the west bank of the Bosten Lake as the research object
,
the root mean square
R
,
logarithmic lg
R
,
recipro⁃cal 1/
R
,
reciprocal 1/lg
R
were used to transform the original spectral reflectance. The fractional differentiation was introduced to perform differential preprocessing within 02 on the transformed spectral reflectance. The characteristic band through significance test was used to model and verify partial least squares regression. The results show that: 1)The characteristic bands that passed the significance test were mostly 1/
R
of 691 ba
nds
,
which was 226 more bands than the original band
R
. With increasing orders，the number of bands that passed the significance test in each order showed a trend of increasing first and then decreasing. The characteristic bands that passed more were 0.4 and 0.6 orders of 1/
R
,
which were 145 and 150
,
respectively. 2)The absolute value of the correlation maximum value of the original spectrum R was 2nd order 0.53. The absolute value of the correlation maximum value of the other four mathematical transformations was 0.110.16
,
higher than R.The characteristic bands were mainly concentrated at 6001 000 nm and 2 0202 330 nm. 3)The fractional differential of the original spectral R
,
the root mean square
R
，the logarithm lg
R
,
the reciprocal 1/R
and the logarithm reciprocal 1/lg
R
was modeled by partial least squares regression. The model established at 0.2th order of 1/lgR was the best one
,
with
R
^{2}
_{C}
=0.78
,
RMSE
_{C}
=1.56
,
R
^{2}
_{V}
=0.63
,
RMSE
_{V}
=1.44
Start

up optimization and phase

frequency decoupling strategy forenhanced phase

locked loop
HE Laipei, ZHENG Shousen, QI Xinmei, HUANG Yuhe
2020, 59(4): 6473. doi:
10.13471/j.cnki.acta.snus.2019.07.10.2019B067
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In this paper, a modified pseudolinear enhanced phaselocked loop (PLEPLL) is proposed to improve the performance of PLL synchronization when the power grid is under nonideal condition, such as disturbances and faults. The modification is based on a timelydecoupling strategy between the estimated phaseangle and the estimated frequency, for which in a designable frequencylocked range, the robustness of frequency synchronization is enhanced and the dynamic performance of PLL is improved. In addition, based on the feature that PLEPLL has two different phaselocked points, an optimized setting of the initial value of the estimated phaseangle is introduced in this paper, which can statistically improve the startup speed of the PLEPLL algorithm. Finally, the feasibility of the proposed method has been verified by simulation and experimental results.
Parameter identification of delayed system based on response sensitivity approach
WU Rong, LIU Jike, LU Zhongrong, WANG Li
2020, 59(4): 7478. doi:
10.13471/j.cnki.acta.snus.2019.03.05.2019B019
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Based on sensitivity analysis, by introducing Tikhonov regularization and trustregion restriction, the inverse problem of delayed system  parameter identification is transformed into a normal nonlinear least squares optimization problem with trust region, and a parameter identification method for delayed system based on response sensitivity approach is proposed. A singledegreeoffreedom linear delayed system model is studied and the sensitivity analysis of acceleration is carried out. The numerical simulation of parameter identification shows that the proposed method can effectively identify the parameters of simple delayed system, and has the advantages of high identification accuracy, fast convergence speed and less sensitivity to noise. This numerical example verifies the feasibility and efficiency of the response sensitivity approach in the practical parameter identification of delayed systems.
Bridge finite element model updating based on improved steady state genetic algorithm
QIN Shiqiang, ZHANG Yazhou, KAGN Juntao
2020, 59(4): 7988. doi:
10.13471/j.cnki.acta.snus.2019.06.20.2019B062
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Due to the test errors and the uncertainties of structural parameters, the best local and global solutions are all possible to be the true solution of finite element model updating. To simultaneously obtain the local and global best solutions in model updating, an improved steady state genetic algorithm (ISSGA) is proposed. The proposed ISSGA utilizes a double angle operator to select alternative solutions of the objective function. The solutions are iteratively optimized by defining the solutions pairs, and the global and local best solutions are eventually obtained. Two benchmark functions and model updating of a concrete box girder bridge are employed to validate ISSGA regarding the accuracy, stability and calculation efficiency. In addition, the principle to determine the algorithm parameters is clarified. The results show that the ISSGA can obtain the global and the best local of the objective function at same time. The double angle operator can avoid the omission of the best local. ISSGA provides a possibility to obtain the solution of model updating wi the best justification.
Location routing problem with outsourcing strategy
JIN Wenzhou, ZHU Zixuan, WU Weitiao, LI Ting
2020, 59(4): 8997. doi:
10.13471/j.cnki.acta.snus.2019.03.30.2019B031
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The rapid development of logistics outsourcing has brought new opportunities for the supply chain integration design. This paper proposes a location routing problem planning model with the outsourcing strategy, with the objective to reduce the logistics system cost via partially outsourcing vehicle tasks. Considering the constraints in actual operation such as time windows, and the composition of selfdelivery and outsourcing transportation costs, we develop a model to minimize the total cost of the logistics network by a jointly optimizing the distribution of facility locations and vehicle routing decision. The system includes fixed cost of selfvehicle and variable transportation costs, the fixed costs of distribution center construction, and the transportation costs of outsourcing. According to the characteristics of the problem, the hierarchical coding method is designed for genetic algorithm. Through the simulation example, the proposed strategy is compared with the traditional complete selfdelivery and outsourcing operation mode. The results show that the proposed strategy could effectively reduce the additional cost of selfdelivery and the construction cost of the distribution center, thus reducing the system cost. Our proposed is experimentally proved to reduce the system cost by 8.08% and 25.03% compared to the complete selfdelivery and outsourcing operation mode, respectively. Finally, the impact of different outsourcing price on the systematic decisions is investigated by sensitivity analysis.
Mass spectra characteristics of ship emission and its influence on air quality of Yantai City
HUANG Bo, WANG Mingling, CHEN Qian, WANG Xiaojun, BI Yanru, TIAN Yingze, WANG Zaihua, MA Jia, LI Mei
2020, 59(4): 98108. doi:
10.13471/j.cnki.acta.snus.2020.05.15.2020B057
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Singleparticle aerosol mass spectrometer (SPAMS) was used to analyze the source features of 3 typical ship emissions in Yantai. The results showed that particle classes emitted by marine diesel oil were mostly composed of organic carbon (OC) and elemental carbon (EC), while those emitted by heavy fuel oil contained larger number of metalcontaining particles such as Fe, V, K and Na. Vcontaining particle classes accounted for the largest proportion in heavy fuel oil emission, and were mainly concentrated in the small particle size range of 0.5~1.1 μm, while the metalcontaining particles such as Si, Fe, K, and Pb were mainly distributed in larger size range of 0.8~1.4 μm. Based on the results, the Vcontaining particles were used as shipemission tracer to study the impact of ship emissions on the air quality of 5 typical sites in Yantai. The results revealed that the five sites were obviously affected by ship emissions especially in spring and summer. The two sites Parkson Mall and Wanrun Chemical were the closest to the port, and suffered the most from the ship emissions. Under specific conditions in spring and summer, the Vcontaining particles proportion could reach up to 40%. Based on the statistical data, the PM
_{2.5}
emitted from inland and coastal ships in Yantai City were estimated to be 463.6 t in 2017, which was of the same order of magnitude as vehicle emission. Further attention should be paid to the impact of ship exhausts on local air quality.
Solution and analysis of dynamic response for layered transversely isotropic structure of concrete pavement
WU Hongbin, YANG Linqing, ZHANG Yu
2020, 59(4): 109119. doi:
10.13471/j.cnki.acta.snus.2019.09.12.2019B085
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Considering that concrete pavement structure has certain transverse isotropy property due to its formation process and other reasons, in this paper, the dynamic stiffness matrix of deflection basin in frequency domain is obtained by using Fourier integral equation transformation method, and then the dynamic response of deflection basin in time domain under dynamic load of Falling Weight Deflectometer is obtained by using mixed variable algorithm. The algorithm can be expressed analytically in horizontal direction, and precision in computer sense can be achieved by precise integration algorithm in vertical direction. Numerical examples verify the accuracy of the proposed algorithm. On this basis, extensive parametric analysis is carried out for bottom boundary condition of the pavement structure and the transversely isotropic property, so as to provide reliable analysis for engineering practice.
Analysis of factors affecting city bus accident severity based on Logistic model
:
a case in Guangdong Province
LIN Qingfeng, DENG Yuanchang
2020, 59(4): 120127. doi:
10.13471/j.cnki.acta.snus.2019.04.10.2019B035
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In order to explore the impact of risk factors, i.e. human, vehicle, road and environment, on bus accident severity, 5 869 bus accidents happening in Guangdong Province during 2008 and 2017 were selected and then divided into 3 categories which were accidents between vehicles, vehiclepedestrian accidents and single vehicle accidents. Taking accident severity as the dependent variable and selecting age, vehicle maneuver, road alignment, region, lighting condition and accident modalities etc as the independent variables, Logistic models were constructed for comparative analysis. The results show that: The models fit the data properly except the model of single vehicle accidents. The risk factors of bus accident severity had similarities and differences among accidents with different modalities. Vehicle maneuver, road type, region and time were significantly correlated with bus accident severity except in the model of single vehicle accidents. Road alignment only significantly influenced the overall bus accident severity, while type of crash location and holiday only had significant impact on severity of accidents between vehicles. The results can provide references for reducing bus accident severity.
Self

adaptive sliding mode synchronization of fractional

order and integer

order uncertain multi

chaotic systems
MAO Beixing
2020, 59(4): 128133. doi:
10.13471/j.cnki.acta.snus.2019.09.17.2019B089
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In this paper, we study synchronization of a class of fractionalorder and integerorder multichaotic systems with uncertainties models and external disturbances using selfadaptive sliding mode approach. And the sufficient conditions were arrived for fractionalorder and integer order multichaotic systems getting selfadaptive sliding mode synchronization by design sliding mode functions and control laws. Numerical simulation demonstrate the correctness of the conclusion.
Vertex

distinguishing IE

total coloring of
K
_{4,4,p}
(4≤
p
≤1 007)
MA Jingjing, CHEN Xiang'en
2020, 59(4): 134143. doi:
10.13471/j.cnki.acta.snus.2019.06.12.2019A047
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Let
G
be a simple graph.An IEtotal coloring
f
of
G
is called that if there are no two adjacent vertices of
G
receive the same color, For an IEtotal coloring
f
of
G
, if
C
(
u
)≠
C
(
v
) for two distinct vertex
u
and
v
, where
C
_{f}
_{ (x)}
or
C
(
x
) denotes the set of colors of vertex
x
and of the edges incident with
x
under
f
, then
f
is called a vertexdistingushing IEtotal coloring of
G
. By using of themethods of distributing the color sets in advance, constructing the colorings and contradiction, the vertexdistinguishing IEtotal coloring of complete tripartite graphs
K
_{4,4,p }
(4≤
p
≤1 007) is discussed. The vertexdistinguishing IEtotal chromatic number of
K
_{4,4,p}
(4≤
p
≤1 007) is determined.
Some properties of nonlinear expectations
HUANG Anqi, ZHOU Jinming, JI Ronglin
2020, 59(4): 144148. doi:
10.13471/j.cnki.acta.snus.2019.06.25.2019A050
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Under the axiomatic assumptions for nonlinear expectations and financial risk measures
,
the relation between sublinear expectations (Resp. superlinear expectations) and coherent risk measures is obtained, respectively. Furthermore, under a natural continuous assumption for the nonlinear expectations, the relationship between convex expectations (Resp. concave expectations) and convex risk measures is also established, respectively.
The generalization of Hermite

Hadamard type fractional integrals inequalities for preinvex functions
SUN Wenbing, ZHENG Linghong
2020, 59(4): 149157. doi:
10.13471/j.cnki.acta.snus.2019.07.02.2019A055
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An identity with parameter is constructed via RiemannLiouville fractional integrals on the invex subset.Using the constructed integral identity as the auxiliary function,some new HermiteHadamard type fractional integrals inequalities are derived,whose absolute values of the derivatives of the functions are preinvex.When the parameters are taken some specific values,some integral inequalities with different forms are obtained.
A delayed virus infection model with latent infection cells
YANG Junxian, YU Shumei
2020, 59(4): 158167. doi:
10.13471/j.cnki.acta.snus.2019.07.17.2019A058
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A class of delayed virus infection models with latently infected cells are investigated. The basic reproduction number is defined, and the sufficient conditions for the existence of each feasible equilibrium are given. By using Lyapunov functionals and LaSalle's invariance principle, it is proved that when the basic reproduction number is less than or equal to unity, the infectionfree equilibrium is globally asymptotically stable; when the basic reproduction number is greater than unity, the chronicinfection equilibrium is globally asymptotically stable, but the infectionfree equilibrium is unstable. The results show that the latently infected delay, the intracellular delay, and virus production period in the model do not affect the global stability of the model, and numerical simulations are carried out to illustrate the theoretical results.
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