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2019 Vol.58 Issue.3
Published 2019-05-25

1 Characteristics ofδ13C and C/N in the Holocene organic material of borehole ZK19 in Lingdingyang bay and the records of east Asian Monsoon variation
TAO Hui;WANG Jianhua;CHEN Huixian;WAXI Lali;WU Jiaxue
2019 Vol. 58 (3): 1-12 [Abstract] ( 18 ) [HTML 1KB] [ PDF 2582KB] ( 62 )
13 On the sedimentary environment change since Holocene in the Sanya Bay, Hainan Island

In order to study the sedimentary evolution and paleoenvironments change during the early Holocene, a 156 m core (SY01) was obtained from the Sanya basin. The age frame of core SY01 was established based on four AMS14C dating results. The paleoenvironmental analysis methods of grain size, loss on ignition (LOI), grayscale and foraminifera were used to reconstruct the sea level change, sedimentary facies and paleoenvironment evolution in this area. The results show that the SY01 sediments can be divided into five layers: gravel-silty fine sand layer, coarse-silty sand layer, medium-silty sand layer, fine-silty sand layer, and silty sand layer. The foraminifera mainly occurred in the period of 8.1-3.7 cal ka BP, with the highest abundance during 5.2-4.7 cal ka BP. The LOI analysis shows that the contents of organic matter and carbonate were relatively high during 5.2-4.7 cal ka BP, and the grayscale values also reflect the sedimentary environment with a reduction condition. Therefore, the depositional process of the study area can be divided into 5 stages: Inner pluvial faciesLateral pluvial facies-Littoral facies-Estuarine facies-Lagoon facies. The deposition started from ~9 cal ka BP, and the highest sea level occurred at ~5 cal ka BP, and then the Sanya basin became the fresh water environment in the late Holocene.

2019 Vol. 58 (3): 13-21 [Abstract] ( 16 ) [HTML 1KB] [ PDF 2371KB] ( 39 )
22 The climate comfort model for evaluating heat-avoiding resorts in China
LIU Yi;LU Zhanqing;CHEN Xinnuo

Based on theories in climatological study, this paper conducts a critical review upon several tourism climate comfort models. It then develops a new model called “STCI” (Summer Tourism Comfort Index) by absorbing insights from the model of Comprehensive Climate Comfort (CCC) and data from firsthand questionnaire survey. This paper applies the STCI model for evaluating places with good heat-avoiding condition for serving as summer tourism destinations in China, based on climate-related data from 244 cities. The results show that ranking lists under the STCI model, the CCC model and the report of “The Development of Summer Tourism in China in 2014” have significant differences. The conclusions are: (1) the STCI model identifies many potential summer tourism destinations in China which still have not been explored. These places have superior conditions for developing summer tourism, but they are yet to be effectively explored because of locational disadvantages or weak economic reputation. (2) Most of China‘s heat avoiding resorts are located in northeast (high-latitude) and southwest (high-altitude), whereas whether the northwest part and “North China” are suitable for summer tourism  remains controversial. (3) Among all the 244 cities, there are seven highly potential cities for developing summer tourism such as Suihua city in Heilongjiang Province and Baoshan City in Yunnan province. Based on these findings, this paper provides suggestions for governments, industries and tourists accordingly.

2019 Vol. 58 (3): 22-31 [Abstract] ( 16 ) [HTML 1KB] [ PDF 1432KB] ( 41 )
32 Flood sequence frequency analysis based on generalized Pareto distribution
ZHAO Lingling;CHEN Zishen;LIU Changming; XU Yangsheng

The threshold selections, excess value sample fitness test of peaks over threshold model of the flood series were deeply approached to provide a better frequency analysis method for flood designing in this paper. As a flood POT model example with the daily discharges measured at Dabai hydrologic station located in Caojiang River basin of Guangdong Province. The threshold selections were used by empirical mean excess function chart, and the Poisson distribution and the fitness indicators of excess values of peaks above different high level were tested. And then, a contrastive analysis was made among the flood models of optimal GPDandPearson Type III distribution. The main findings were as follows: 1) The Caojiang River flood extreme value distributions were heavy tail type; 2) The empirical mean excess function chart can be used as an important selection reference of Dabai flood threshold, but the optimal threshold determination should be investigated with multiindex ; 3) The good-fitness test indicated that the GPD model was better than Pearson Type III; 4) The parameter estimate methods have higher impact on the calculation results of flood return levels.

2019 Vol. 58 (3): 32-39 [Abstract] ( 14 ) [HTML 1KB] [ PDF 1557KB] ( 38 )
40 Process of erosion-deposition and the cause analysis in Hanjiang River Sanhe Dam-Chaozhou Water Supply Project Section
YANG Yunping; WANG Jianjun;LI Xiaoxing;XU Junfeng;WANG Yi‘an

The river sediment volume and intensity, cross section and the thalweg change of Sanhe Dam-Chaozhou Water Supply Project section of the Hanjiang River were analyzed using the measured topographic data from 2002 to 2017. Based on the sediment transport balance, combined with the amount of river channel sand mining, the main controlling factors that cause the channel erosion and deposition are determined. The results are as follows: 1) The thalweg of the Hanjiang River Sanhe Dam-Chaozhou Water Supply Project section shows a downcutting trend. During the period from 2002 to 2017, the average downcutting values of the Sanhe Dam-Gaobei hydro-junction, Gaobei hydro-junction-Dongshan hydro-junction and Dongshan hydro-junction-Chaozhou Water Supply Project were 1.92 m, 1.15 m and 5.38 m, respectively. 2) Sanhe Dam-Dongshan hydro-junction had a slight deposition from 2002 to 2008 and an erosion trend from 2008 to 2017. The erosion intensity decreased in Sanhe Dam-Dongshan hydro-junction, but increased in the Gaobei-Dongshan hydro-junction. 3)During the period from 2002 to 2017, the river channel of Dongshan hydro-junction-Chaozhou Water Supply Project showed an erosion trend, and the erosion intensity decreased first and then increased. 4)Based on the theory of sediment balance in the river and in combination with the sand mining quantity, it is believed that the sand mining is the main controlling factor that causes the river bed down cutting.

2019 Vol. 58 (3): 40-47 [Abstract] ( 9 ) [HTML 1KB] [ PDF 3598KB] ( 27 )
48 Phenological and breeding characteristics of Merrillanthus hainanensis (Apocynaceae, Asclepiadaceae)
LIAO Haobin;FENG Lu;XIONG Wujian;JIANG Qiancai;ZHANG Xinjian; YE Fan; LIAO Wenbo

The phenological cycle, the general characteristics of flower, the species of pollinators, the flower visiting behaviors and the pollination process were investigated in the population of Merrillanthus hainanensis. The pollen viability and stigma receptivity within the population were measured, and its artificial pollination test was also conducted. The results showed that: ① The phenophase of Merrillanthus hainanensis can be roughly divided into spreading stage, initial flowering, flowering stage, final flowering, fruiting stage, young fruit stage, fruit ripening and fruit falling. ② The hybrid index of  Merrillanthus hainanensis is four, indicating that its breeding system is dominated by outbreeding, partly selfcompatible and needs pollinators. ③ Artificial bagging experiments showed that there was no spontaneous self-pollination phenomenon.  ④ The insect moved out of the pollen block by means of the special structure of the foot and inserted the pollen block into the stigma cavity through the opening of the anther to complete the pollination. The most frequent floral visitors were bees ( Megachile sp., Apis cerana and Polistes formosanus).

2019 Vol. 58 (3): 48-53 [Abstract] ( 7 ) [HTML 1KB] [ PDF 1593KB] ( 26 )
54 5S rRNA interactome reveals that 5S rRNA is involved in mRNA splicing regulation
ZHOU Xiangming; YANG Bing;LAI Qiao; LI Le; DONG Jun; LIAO Jianyou; ZHU Shuang

This study aims to systematically reveal the new function and molecular mechanism of 5S rRNA regulating cell process. The biotin-labeled probe was synthesized, and the 5S rRBP was obtained by molecular hybridization. 162 5S rRNA interacting proteins was identified by high sensitivity mass spectrometry and bioinformatics analysis. Protein complex-based gene sets analysis was based on ConsensusPathDB. Protein-protein interaction network was constructed basing on STRING database. The GO database was used for acquiring functional annotations of interactive proteins. KEGG database was used for pathway enrichment analysis. The analysis showed that in addition to interacting with translation-related proteins, 5S rRNA also interacts with a large number of proteins from microRNA processing pathways, mRNA splicing pathways and signal pathway regulation pathways, etc. The result indicates that 5S rRNA not only have the function of protein translation regulation, but also participate in the regulation of mRNA splicing and other processes. This study points out a new direction for the study of 5S rRNA function and regulatory mechanism.

2019 Vol. 58 (3): 54-62 [Abstract] ( 11 ) [HTML 1KB] [ PDF 1741KB] ( 32 )
63 Secondary metabolites from the marine actinomycete Streptomyces novaecaesareae
YU Xin;WEI Xia; FENG Chan; FAN Qian;WANG Siyu;ZHANG Weimin;ZHANG Cuixian

By using various sorts of column chromatography, ten compounds were isolated from Streptomyces novaecaesareae which was isolated from the South China Sea. Based on the spectrum of NMR, MS and comparing the data with references, their structures were identified as cyclo-(L-4-Hypro-D-phe) (1) , cyclo-(4-hydroxy-L-pro-L-phe)  (2) , cyclo (L-Pro-D-trans-Hyp)  (3),  cyclo (4-hydroxy-Lpro-L-leu)  (4),  cyclo- (-L-Pro-L-Phe)  (5),  cyclo-(-L-leu-L-pro)  (6),  cyclo (-D-Pro-L-Leu)  (7),  callyspongidipeptide A  (8),  N-(4-oxopentyl)-acetamide  (9)  and dibutylphthalate  (10).  Compounds1-9 were Ylide compounds which were composed of naturally rare -D-configured amino acids. All Compounds were isolated from -S. novaecaesareae- for the first time.

2019 Vol. 58 (3): 63-70 [Abstract] ( 11 ) [HTML 1KB] [ PDF 1023KB] ( 29 )
71 Crystallization and mechanical properties of PLA/micro-CaCO3 modified with different compatibilizers
LI Mei; TAN Jiali; LU Zhiwei;LI Haonan; WU Zexiong; MAI Kancheng

In order to strength the interfacial effect of PLA/micro-CaCO3 and improve the toughness of PLA, PLA/micro-CaCO3 composites were prepared with POE-gMAH and EVA-g-MAH. The crystallization and mechanical properties of the PLA/micro-CaCO3 composites modified with different compatibilizers were compared. DSC and XRD results suggest that the addition of POE-g-MAH remarkably improve the crystallization rate and crystallinity of PLA/micro-CaCO3 composites. When the filling content of micro-CaCO3 reach 40%, the crystallinity of PLA can be improved from 2.0% to 45.8%. While the addition of EVA-g-MAH has little effect on the crystallization of PLA/micro-CaCO3. Mechanical tests indicate that EVA-g-MAH has better effect than POE-g-MAH on toughing the PLA/micro-CaCO3 composites.

2019 Vol. 58 (3): 71-78 [Abstract] ( 8 ) [HTML 1KB] [ PDF 1987KB] ( 28 )
79 AKNN-Qalsh: an approximate KNN search extension for high-dimensional data in PostgreSQL
ZHANG Chuhan;ZHANG Jiaqiao;FENG Jianlin

Complex data objects (such as pictures, text) are usually represented as high-dimensional feature vectors. The existing nearest neighbor search method KNN-Gist in PostgreSQL is based on the tree-structured index and cannot efficiently support the nearest neighbor search of high-dimensional data. The PostgreSQL system high-dimensional approximate nearest neighbor search extension: AKNN-Qalsh is introduced, which is based on the Locality-Sensitive Hashing scheme and supports approximate nearest neighbor search of large-scale, high-dimensional data objects. The effectiveness of the extension via extensive experiments on five real data sets is demonstrated.

2019 Vol. 58 (3): 79-85 [Abstract] ( 13 ) [HTML 1KB] [ PDF 1521KB] ( 39 )
86 The neighbor expanded sum distinguishing total colorings of three types of join graphs of wheel and fan
ZHANG Hui;CHEN Xiang‘en; WANG Zhiwen

The neighbor expanded sum distinguishing total coloring of join of two wheels is discussed and its neighbor expanded sum distinguishing total coloring index is determined. Then the neighbor expanded sum distinguishing total colorings and neighbor expanded sum distinguishing total coloring indexes of joins of one fan and one wheel, and two fans are obtained, respectively by the method of deleting edges.

2019 Vol. 58 (3): 86-93 [Abstract] ( 15 ) [HTML 1KB] [ PDF 965KB] ( 33 )
94
Existence and uniqueness of global solution for the treatment model of cancer vaccine and checkpoint inhibitor
Existence and uniqueness of global solution for the treatment model of cancer vaccine and checkpoint inhibitor[J]. , 2019,58(3): 94-102>')" href="#"> LIU Chunyan; WEI Xuemei; FENG Zhaoyong;LIU Chengxia

A combined treatment model of cancer vaccine and checkpoint inhibitor, which contains nine coupled reaction diffusion equations, is studied. By using the Banach fixed point theorem and  Lp theory of parabolic equation, the existence and uniqueness of the model in the local solution is proved. And then the existence and uniqueness of the global solution is obtained by using the extension method.

2019 Vol. 58 (3): 94-102 [Abstract] ( 11 ) [HTML 1KB] [ PDF 932KB] ( 30 )
103 Third Hankel determinant for a class of generalized analytic functions onthe righthalf bounded domain of lemniscate of Bernoulli
TANG Huo;ZHANG Haiyan; NIU Xiaomeng

Let A  be the class of analytic functions f(z) in the unit disc D={z:|z|<1} normalized by  f(0)=f′(0)-1=0 . A class of generalized analytic functions SR*λon the right-half bounded domain of lemniscate of Bernoulli is introduced, which is shown as follows:SR*λ={f∈A:(1-λ)f(z)/z+λf′(z)<√(1+z)(0≤λ≤1;z∈D)}。 .
And, the third Hankel determinant H3(1)  for the above function class SR*λ  is investigated and the upper bound for the above determinantH3(1)  is obtained.

2019 Vol. 58 (3): 103-109 [Abstract] ( 12 ) [HTML 1KB] [ PDF 1533KB] ( 41 )
110 Comprehensive benefit evaluation of the leftturn waiting zone on signalized intersection
LI Jing;WANG Zhanyong;CAI Ming

Combined with microscopic traffic simulation software, HSM road traffic accident prediction model, the Comprehensive Modal Emissions Model (CMEM) and vehicle noise emission model and the attenuation model, in addition to a consideration of social cost, a comprehensive method was proposed to establish the dynamic traffic simulation model of signal intersection with and without left-turn waiting zone(LWZ), and then quantitatively evaluate the LWZ from the aspect of traffic efficiency, fuel consumption, traffic safety, air pollution, greenhouse effect and noise pollution. At last, the method was applied to a real intersection of Guangzhou, and the results show that the average comprehensive cost of the intersection with the LWZ is reduced by nearly 25%. The example had proved that setting LWZ can effectively promote traffic efficiency at the intersections, but leads to the increase of air pollution and noise pollution. The method can evaluate the value of LWZ comprehensively and effectively, and be a consultation for road planning.

2019 Vol. 58 (3): 110-117 [Abstract] ( 17 ) [HTML 1KB] [ PDF 0KB] ( 35 )
118 Weakening effect of crossed joints on the mechanical characteristics of rock mass
LIU Jiaming;SUN Shaorui;ZHANG Zhonghang; GAO Lin;SU Yunji

Aiming at the influence mechanism of crossed joints on the strength and deformation properties of jointed rock mass, the Particle Flow Code (PFC3D) was employed. Combined with the parameter calibration process. Three types of blocks (Series S, SD and SN) with different numbers of joint sets were considered in this article. The uniaxial compression test was carried out to study the effect of crossed joint sets on the strength, deformation and failure characteristics of jointed rock mass. The test results show that: 1) The crackinitiation stress and peak stress of the sample with crossed joint sets was relatively higher in comparison with the sample with the same weakest single joint set. 2) The effect of crossed joint sets on the stress field was carried out. Stress concentration was found with the increase of axial stress. 3) The cracks number of the sample with crossed joint sets was relatively higher in comparison with the sample with the same weakest single joint set under the same stress. 4) The crossed-joints was found to have significant effect on the failure mode of jointed rock mass in a certain range.

2019 Vol. 58 (3): 118-130 [Abstract] ( 18 ) [HTML 1KB] [ PDF 1314KB] ( 29 )
131 Optimization method of intersection guide sign setting based on artificial bee colony algorithm
ZHANG Teng; HUANG Min; LIU Fang; ZHENG Jian

When there are many unreachable paths in the road network, there exists mutual influence between the paths, and the optimization cannot reach the overall optimum. Aiming at this phenomenon, a new integrated optimization model is presented. Firstly, the accessibility and comprehensive optimization of guide path are analyzed. Based on this, a comprehensive path optimization guidelines model is proposed with the optimization of the path length and the number of guidance information. Then combining with artificial bee colony algorithm and a neighborhood search strategy for road networks, the algorithm is designed to solve the problem of the concrete design. Finally, Guangzhou Higher Education Mega Center is chosen as the test area. The integrated optimization guidelines of the multiple guidance paths with the aim of Sun Yat-sen University are realized using the proposed model. In addition, comparing with single optimization results, experimental results show that the model can effectively solve the optimization problem for multiple path guidance, and the path quality is consider as a whole.

2019 Vol. 58 (3): 131-139 [Abstract] ( 17 ) [HTML 1KB] [ PDF 2928KB] ( 25 )
140 BKMs blowup criterion in homogeneous Triebel-Lizorkin spaces for the 3D dissipative system in electrohydrodynamics
LI Xiurong,LIANG Hong

In this paper, we study the breakdown of local smooth solutions for a class of nonlinear dissipative electro-hydrodynamics system. This system is a strongly coupled system by the well-known incompressible Navier-Stokes equations in hydromechanics and Poisson-Nernst-Planckequations in electrodynamics, modeling the drift, diffusion and convection phenomena of charged particle in an isothermal, incompressible and viscous fluids. Based on the Littlewood-Paley decomposition theory, the BKM's blowup criterion in terms of horizontal component of velocity field in homogeneous Triebel-Lizorkin spaces is established for local smooth solutions, and generalize the previous results. In particular, this blowup criterion reveals that the horizontal component of velocity field is more important than the density functions of charged particles in the blow-up theory of the system.

2019 Vol. 58 (3): 140-144 [Abstract] ( 12 ) [HTML 1KB] [ PDF 901KB] ( 32 )
145 A semantic decentralized cloud service discovery approach
WANG Wenfeng; HAN Longzhe; LI Peiwu;LI Lan;LIU Tianyuan

With the rapid development of the cloud services conventional service discovery techniques using centralized registries stumble upon performance bottleneck and single point of failures. To address these issues, this paper proposes a semantic decentralized service discovery approach. This paper also introduces a multi-layered cloud ontology which closes the gap to represent cloud services in a standardized way. Here, service descriptions are mapped to a well-structured cloud ontology, which captures vital elements in different service description approaches. Peers are organized into clusters based on the semantic similarity of the service descriptions. To bolster the service discovery efficacy, semantic links are established between peers having higher similarity so that query forwarding is done only to relevant peers. Simulation results show that the proposed approach effectively enhances the query success rate and drops of the execution time.

2019 Vol. 58 (3): 145-152 [Abstract] ( 10 ) [HTML 1KB] [ PDF 1573KB] ( 32 )
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