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1

Experimental and numerical investigations on dynamic tensile behavior of a ZrB2-SiC ceramic

He R., Cao J., Yang K., Wang L., Kong D.

Archives of Mechanics

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2023

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Vol. 75, nr 1-2

53--73

EN

The dynamic tensile behavior of a ZrB2-SiC ceramic was investigated via split Hopkinson pressure bar tests and a bond-based peridynamic model. The experimental results showed that the peak dynamic splitting tensile stress increased linearly with the strain rate. The dynamic tensile stress history and fracture pattern exhibited a significant strain-rate dependence. In simulation, the strain-rate dependent on the critical energy release rate was introduced to predict the dynamic tensile behavior of the ZrB2-SiC ceramic. The numerical results were in good agreement with the experimental results, verifying the applicability of the peridynamic model. The maximum error of the peak dynamic splitting tensile stress between the experimental and numerical results was no greater than 6%. Moreover, the effect of the strain rate on the fracture patterns of the ZrB2-SiC ceramic composite can be well predicted by the peridynamics method. The ZrB2-SiC composite specimen split into two large fragments with additional small fragments under dynamic splitting tension. With the increase of strain rate, the main crack propagation and branching led to a larger fracture region in the middle of the specimen.

2

Influence of initial density of granular stack on transient regime of homogeneous fluidization

Drame A. S., Wang L., Diourte B.

Archives of Mechanics

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2019

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Vol. 71, nr 2

155--171

EN

This study complements a series of preliminary experimental studies of the destabilization of a granular stack immersed by fluidization, the particular case being the transient regime of homogeneous fluidization. The significant influence of the initial density (initial volume fraction) of the granular stack on the transient homogeneous fluidization regime is highlighted. An initially loose stack fluidizes turbulently and chaotically in a few seconds, from the injection zone to the top of the granular layer. Conversely, for the same material in an initially dense state, there is a mass takeoff of the stack, which is added to the propagation of porosity wave instability from the bottom to the top of the stack with fast kinetics that decompacts the medium. The results also showed that the velocity of this porosity wave seems almost constant regardless of the fluidization velocity.

3

Technical application of petroleum logging instruments in marine logging

Gu G., Zhao P., Wang L., Guo H.

Polish Maritime Research

|

2018

|

S 3

22--28

EN

To solve the problem of offshore oilfield development, based on the newly introduced pulsed neutron oxygen activation logging instrument, the application research of test design and interpretation method was carried out and applied to actual production. The structure, technical indicators and logging principles of pulsed neutron oxygen activation logging tools were introduced. The test design under different well conditions was studied, including general positive and negative injection, oil sleeve injection, single oil pipe configuration and multitubing configuration. A large amount of field test data was collected and analysed technically. A set of effective interpretation models was proposed. The corresponding interpretation software was developed. A set of test design methods and operating specifications for different well conditions were developed. Based on the conventional interpretation method, the peak selection, the double-tuber peak identification and the carbon dioxide flooding interpretation method were added. The results show that the test design and interpretation methods were applied well through a large number of field tests and production applications. Therefore, pulsed neutron oxygen activated injection profile logging technology is successfully applied in offshore oil fields.

4

Improving spodumene flotation using a mixed cationic and anionic collector

Wang Y., Zhu G., Yu F., Lu D., Wang L., Zhao Y., Zheng H.

Physicochemical Problems of Mineral Processing

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2018

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Vol. 54, iss. 2

567--577

EN

Lithium, a rare-earth element, has been in increasing demand. Spodumene flotation is an important and challenging step for lithium extraction and production from lithium ore. In the present work, flotation tests for three pure minerals (i.e., spodumene, quartz and feldspar) and a real spodumene ore were carried out at laboratory scale. The results showed that YOA, a mixture of oleic acid and dodecylamine with the molar ration of 10:1, could be used as collector to produce a spodumene concentrate with grade of 5.59% Li2O from the feed ore with grade of 1.48% Li2O where 85.24% of Li2O was recovered to the concentrate. The measured zeta potential, contact angle and adsorption capacity indicated that YOA was preferentially adsorbed on spodumene instead of on quartz or feldspar, with the spodumene surface being more hydrophobic than that of feldspar or quartz. The adsorption energies of YOA on spodumene were calculated and the results provided insights into the superior flotation performance obtained in the present work.

5

Computational fluid dynamics (CFD) numerical simulation and particle image velocimetry (PIV) measurement of a packed flotation column

Yan X., Chen Z., Wang L.

Physicochemical Problems of Mineral Processing

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2018

|

Vol. 54, iss. 2

395--405

EN

Packing is a useful method to obtain a static separation environment for a high flotation recovery and selectivity. In this study, the single-phase flow field in a packed lab-scale cyclonic-static microbubble flotation column (FCSMC) was investigated by computational fluid dynamics (CFD) simulation. Turbulence model was verified by Particle Image Velocimetry (PIV) experiment; the simulation results obtained by the RSM (Reynolds Stress Model) are closer to the experimental data. Based on this validation, RSM turbulence model was used to obtain the effect of sieve-plate on the hydrodynamic characteristics in the column flotation zone. The results show that the sieve-plate packing arrangement greatly straightens the rotation flow and decreases the turbulence. To further improve the effect of packing, two layers of sieve plates were used, and one diameter (1D = 190 mm) was selected as the reasonable distance between the two layers of sieve plates. To quantitative evaluate the effect of sieve-plate packing, the logarithm of Pdk over the logarithm of Pdo was calculated based on the volume-averaged turbulence dissipation rate, increasing from 24.72 for one layer of sieve-plate packing to 216.96 for two layers of sieve-plate packing. The probability of detachment significantly decreased for two layers of sieve-plate packing, and the recovery efficiency was significantly improved.

6

Star-Topological Encryption : Talking to the Sever but Hiding Identities to Others

Li J., Wang L., Niu X., Gu L., Qu Z.

Fundamenta Informaticae

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2018

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Vol. 157, nr 1/2

29--46

EN

In this paper, we propose the notion of Star-Topological encryption that enables some clients confidentially talking to a server but without revealing their identities to others. Then, an encryption scheme is constructed to achieve this cryptosystem based on non-abelian groups. The proposal realizes identity-based encryption and identity authenticity, simultaneously. In this encryption system, both the encryptions and decryptions of two sides of the communications are relying on secret key. Therefore, the encryption/decryption algorithms employ the idea of symmetric key cryptosystem. Meanwhile, the client’s decryption key is generated by taking client’s identity and server’s master secret key as input. Therefore, our encryption scheme can be viewed as an identity-based encryption in Symmetric Key Cryptosystem. Furthermore, the security of the scheme is based on the intractability of factorization search problem over non-abelian algebraic structures. A matrix group over group ring is suggested and an algorithm of computing the inverse of an invertible group ring element is given. Finally, we discuss that our cryptosystem is secure against determinant attacks and quantum attacks.

7

On Graph Algorithms for Degeneracy Test and Recursive Description of Stream Ciphers

Wang L., Hu Z.

Fundamenta Informaticae

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2018

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Vol. 160, nr 3

343--359

EN

Keystreams of a degenerate stream cipher can be generated by another stream cipher of less bits, and recursive description of stream ciphers is useful in cryptanalysis. Two algorithms are proposed based on directed graphs informing whether each pair of bits are related in the state transition: One tests two categories of degenerate synchronous additive stream ciphers, particularly for realistic stream ciphers with sparse transition equations; the other finds a recursive description of a given stream cipher. Specially, the latter algorithm has to balance the efficiency and the number of sequences for a recursive description, and a sufficient condition is given to test degeneracy based on the recursive description.

8

Attribute-based Data Integrity Checking for Cloud Storage

Tian M., Wang L., Zhong H., Chen J.

Fundamenta Informaticae

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2018

|

Vol. 163, nr 4

395--411

EN

Cloud storage is a significant service provided by the cloud that enables users to store their immense data into the cloud. As the advent of the big data era, cloud storage services are becoming increasingly popular. For security reasons, data owners would like to check the integrity of their data after storing it in the cloud. To do this, they usually make use of the public cloud data integrity checking schemes. This paper focuses on user anonymity in such schemes so that no third party could infer the identity information of any data owner from checking procedures. The problem is obviously inevitable in reality, however the current solutions are relatively involved as they heavily use public key certificates and/or incur huge communication overhead. In this paper we introduce the concept of attribute-based cloud data integrity checking to achieve user anonymity lightly and present security models for such systems. We also provide a practical construction and prove its security in the random oracle model. Finally, we show how to extend our construction to protect data privacy against any third party.

9

An Efficient Construction of Quantum Attack Resistant Proxy Re-Encryption Based on (Semi) group Factorization Problems

Wang L., Li J., Gu L., Yan J., Qu Z.

Fundamenta Informaticae

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2018

|

Vol. 157, nr 1/2

47--62

EN

Proxy re-encryption (PRE) enables a semi-trusted proxy to transfer Alice's secrets into Bob's secrets but without seeing the secrets. This functionality is very interesting for making balance between the information confidentiality and the mutual accessibility in various scenarios such as public cloud storage systems. During the past decades, many smart PRE schemes were built based on intractability assumptions such as integer factorization problems (IFP) and discrete logarithm problems (DLP). However, Shor's efficient quantum algorithms for IFP and DLP stand great threats towards the security baseline of these schemes. Enlightened by Gu et al.'s recent work on resisting known quantum attacks, we propose an efficient PRE scheme based on the intractability of the (semi)group factorization problems in this paper. The security of the proposed scheme is analyzed according to some heuristic attacks. Moreover, a special instantiation technique is present in detail, and some illustrations are provided for manifesting the effectiveness and efficiency of the proposed methodology.

10

Tensile-tensile Fatigue Behavior of Multi-axial Warp-knitted Reinforced Composite

Gao X., Tao N., Chen S., Wang L., Wu W.

Fibres & Textiles in Eastern Europe

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2018

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Vol. 26, no. 1 (127)

73--80

EN

An experimental study was carried out on the fatigue behaviour of multi-axial warp-knitted fabric composites. Composite samples reinforced with multi-axial warp-knitted fabric/matrix were manufactured by the vacuum-assisted resin transfer moulding method. Tensile-tensile fatigue cycling was carried out at different load levels, and S-N curves, tensile stress-strain curve and stiffness degradation of the multi-axial composite samples were obtained. Finally post-fatigue tensile tests were done at a stress level of 75%, at the stages of 1/3N and 2/3N, and the equivalent residual strength and stiffness degradation were obtained.

PL

Dokonano oceny właściwości mechanicznych i zmęczeniowych kompozytowych dzianin wieloosiowych. Kompozyty wzmocnione dzianiną wieloosiową wytworzono przy zastosowaniu próżniowej metody formowania. Dokonano oceny zmęczenia materiału i właściwości wytrzymałościowych przy różnych poziomach obciążenia. Przedstawiono krzywe S-N, krzywą naprężenie-odkształcenie i degradację sztywności wieloosiowych próbek kompozytowych. Wykonano również testy zmęczenia materiału przy poziomie naprężenia 75%, w etapach 1/3N i 2/3N. Omówiono równoważną wytrzymałość szczątkową i degradację sztywności kompozytowych dzianin wieloosiowych.

11

Optimising extended warranty policies following the two-dimensional warranty with repair time threshold

Wang L., Pei Z., Zhu H., Liu B.

Eksploatacja i Niezawodność

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2018

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Vol. 20, no. 4

523--530

EN

This paper considers an optimal extended warranty policies after the expiration of base two-dimensional warranty with repair time threshold. During the base two-dimensional warranty period, each failure of the equipment can be either replaced or minimally repaired depending on a pre-specified repair time threshold. After the base warranty expires, the length of an extended warranty policy is available for selection. The equipment is minimally repaired on each failure during the extended warranty. In this study, the length of the extended warranty period is optimized by minimizing the expected cost rate incurred over the whole warranty coverage, from the views of customs and manufacturers respectively. For the purpose of illustration, we present and discuss some numerical examples. The effect of repair time threshold on the optimal strategy is also investigated numerically.

PL

W niniejszej pracy rozważano optymalną politykę przedłużania gwarancji po wygaśnięciu podstawowej gwarancji dwuwymiarowej z ustaloną górną granicą czasu naprawy. W podstawowym okresie obowiązywania gwarancji dwuwymiarowej, po każdej awarii urządzenie zostaje poddane minimalnej naprawie, lub – jeśli naprawa nie może być wykonana we wcześniej ustalonym czasie naprawy – wymienione. Po wygaśnięciu gwarancji podstawowej, konieczne jest wybranie długości okresu obowiązywania gwarancji rozszerzonej. Podczas trwania okresu gwarancji przedłużonej, sprzęt naprawia się w sposób minimalny (naprawa minimalna) po każdorazowym uszkodzeniu. W niniejszej pracy, optymalizowano długość przedłużonego okresu gwarancyjnego poprzez minimalizację oczekiwanych kosztów poniesionych podczas całego okresu trwania gwarancji; optymalizację przeprowadzono z perspektywy klienta jak i producenta . Dla ilustracji, przedstawiono i omówiono wybrane przykłady numeryczne. Przeprowadzono także analizę numeryczną wpływu górnej granicy czasu naprawy na optymalną strategię gwarancyjną.

12

Three-dimensional simulation of the fracture system distribution in formation rock based on fractal method

Li W., Zhao H., Liu M., Li S., Sun W., Wang L.

Archives of Mining Sciences

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2018

|

Vol. 63, no. 2

425--436

EN

During exploitation process of fractured reservoir, the complex distribution of natural fracture system may lead to a series of accidents, such as sand plug and multi fracture extension in hydraulic fracturing operation. Considering the difficulties of numerical analysis on formation rock mass fracture system distribution, three-dimensional geometry model of a single fracture formation is proposed in this paper, and fractal geometry method is introduced to build the three-dimensional fractal description model of formation fracture system distribution. On this basis, the effects of fractal parameters on natural fracture porosity, permeability and other properties are analyzed. The results show that: First, the number and propagation of natural fracture are controlled by the fractal dimension, the number of groups and the initial quantity. Second, the fractal dimension of natural fracture distribution has an obvious effect on natural fracture porosity and permeability. Third, porosity and permeability of natural fracture distribution both experience exponential growth as fractal dimension increases. Fourth, when the fractal dimension remains constant, the porosity and permeability of natural fractures both increase with the fracture scale.

PL

W trakcie eksploatacji złoża zalęgającego w spękanych warstwach i pokładach złożony system naturalnych spękań prowadzić może do licznych incydentów, np. powstawania zatorów piaskowych lub nadmiernego rozszerzenia spękań w trakcie szczelinowania hydraulicznego. Z uwagi na trudności związane z analizą numeryczną rozkładu spękań skał macierzystych, w pracy zaproponowano trójwymiarowy model geometryczny pojedynczego pęknięcia z wykorzystaniem metod geometrii fraktalnej do opracowania trójwymiarowego modelu opisującego powstawanie układu spękań i ich rozkład. Na tej podstawie przeanalizowano wpływ parametrów fraktalnych na naturalną porowatość pękniętych skał, ich przepuszczalność oraz pozostałe właściwości. Wyniki badań wskazują że, po pierwsze, liczba i tempo propagacji naturalnych spękań uzależnione są od wymiarów fraktalnych, liczby grup i wielkości początkowej. Po drugie, wymiary fraktalne naturalnego systemu spękań skał mają zdecydowany wpływ na porowatość i przepuszczalność. Po trzecie, porowatość i przepuszczalność naturalnych systemów pęknięć wykazują wzrost w miarę wzrastania wymiarów fraktalnych. Po czwarte, gdy wymiary fraktalne pozostają niezmienne, zarówno porowatość i przepuszczalność naturalnych spękań rosną wraz ze skalą fraktali.

13

Phase Transition and Plasticity Enhancement of Ti-Cu-Based Bulk Metallic Glasses

Wang L., Wang X., Zhang G., Sun X.

Archives of Metallurgy and Materials

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2018

|

Vol. 63, iss. 1

387--391

EN

In this paper, we report the complex crystallization kinetics of phase transition happening in Ti-Cu-based bulk metallic glasses (BMGs), which play significant roles in the glass formation with respect to their low reduced glass transition temperatures, Trg. The first exothermic event just occurs when annealing the BMG samples in the supercooled liquid region, leading to the Avrami exponent deviating from conventional modes affected by the residual amorphous phase. For Ti43Cu43Ni7Zr7 BMG, the plasticity can be improved by pre-annealing at a sub-Tg temperature of 623K (≈50K below Tg) for 0.5 hour, however, deteriorated by 1 hour annealing, which could be related to the change in stability of this BMG against crystallization with different pre-annealing times.

14

Minimum dispersion coefficient criteria based positioning algorithm for BDS

Wang L., Li L.

Archives of Electrical Engineering

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2018

|

Vol. 67, nr 4

739--753

EN

The BeiDou navigation satellite system (BDS) is one of the four global navigation satellite systems. More attention has been paid to the positioning algorithm of the BDS. Based on the study on the Kalman filter (KF) algorithm, this paper proposed a novel algorithm for the BDS, named as the minimum dispersion coefficient criteria Kalman filter (MDCCKF) positioning algorithm. The MDCCKF algorithm adopts minimum dispersion coefficient criteria (MDCC) to remove the influence of noise with an alpha-stable distribution (ASD) model which can describe non-Gaussian noise effectively, especially for the pulse noise in positioning. By minimizing the dispersion coefficient of the positioning error, the MDCCKF assures positioning accuracy under both Gaussian and non-Gaussian environment. Compared with the original KF algorithm, it is shown that the MDCCKF algorithm has higher positioning accuracy and robustness. The MDCCKF algorithm provides insightful results for potential future research.

15

Mechanical properties and abrasive wear behaviors of in situ nano-TiCx/Al–Zn–Mg–Cu composites fabricated by combustion synthesis and hot press consolidation

Gao Y. Y., Qiu F., Shu S. L., Wang L., Chang F., Hu W., Han X., Li Q., Jiang Q. C.

Archives of Civil and Mechanical Engineering

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2018

|

Vol. 18, no. 1

179--187

EN

The in situ nano-TiCx/Al–Zn–Mg–Cu composites with different TiCx content (20, 25 and 30 vol.%) were successfully fabricated by combustion synthesis and hot press consolidation in Al–Ti–C/CNTs systems. The compressive properties and abrasive wear resistance of the composites improved with the increase in the TiCx content. The transformation of carbon source from pure C black to the mixture of C black and CNTs to pure CNTs in Al–Ti–C/CNTs systems leaded to a significant improvement in the compressive properties and wear resistance of the composites as well as a significant decrease in the average size of TiCx particles. The average size of the nano-TiCx particles in 30 vol.% TiCx/Al–Zn–Mg–Cu composite synthesized by the carbon source of CNTs reached 81 nm, moreover, the yield strength (σ0.2), the ultimate compression strength (σUCS) and the fracture strain (ɛf) of the composite reached 597 MPa, 882 MPa and 21.7%, respectively.

16

A simple HPLC method for the determination of butorphanol tartrate and ondansetron hydrochloride in patient-controlled analgesia solution

Fang B., Wang L., Chen F., Li P., Shi X.

Acta Chromatographica

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2018

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Vol. 30, no. 1

43--46

EN

A simple and rapid high-performance liquid chromatographic (HPLC) method was established for simultaneous determination of butorphanol tartrate and ondansetron hydrochloride in analgesic mixture samples used for patient-controlled analgesia (PCA). The separation of butorphanol tartrate and ondansetron hydrochloride in PCA solution was carried out on phenomenex C18 column (4.6 mm × 150 mm, 5 μm) using 50 mM sodium acetate (pH 4.0) buffer and acetonitrile (72:28, v/v). Flow rate was 1.0 mL min−1 with a column temperature of 30 °C, and detection wavelength was carried out at 280 nm and 306 nm. Validation of the method was made in terms of specificity, linearity, accuracy, and intra- and inter-day precision, as well as quantification and detection limits. The developed method was successfully used to evaluate the chemical stability of butorphanol tartrate and ondansetron hydrochloride in analgesic mixtures at the usual concentration used for PCA.

17

Wpływ mielenia strumieniowego na strukturę i fizyczno-chemiczne właściwości skrobi kukurydzianej o dużej zawartości amylozy

Wang L., Liu T., Cou F., Xiao Z., Cao L.

Przemysł Chemiczny

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2017

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T. 96, nr 5

1128--1134

PL

Skrobię o dużej zawartości amylozy HAMS (high-amylose maize starch) modyfikowano, stosując mielenie strumieniowe, a następnie badano jej strukturę molekularną i właściwości fizyczno-chemiczne metodami skaningowej mikroskopii elektronowej, dyfraktometrii rentgenowskiej, spektroskopii w podczerwieni z transformacją Fouriera, skaningowej różnicowej kalorymetrii, a także za pomocą laserowego analizatora wielkości cząstek oraz szybkościowego wiskozymetru. Stwierdzono zmianę postaci mikronizowanych ziaren skrobi. Stały się one małe, nieregularne i szorstkie. Przeciętna średnica ziaren zmalała z 14,62 μm do 6,14 μm, przy czym rozrzut wielkości ziaren stał się wąski i regularny. Krystaliczna struktura skrobi uległa przemianie do typu B, a krystaliczność produktu zmalała z 34,63% do 24,19%. Mielenie nie spowodowało powstania żadnych nowych grup funkcyjnych. Temperatura kleikowania mikronizowanej skrobi zmalała (zarówno temperatura początkowa, maksymalna, jak i końcowa), co wynikało ze znacznych zmian termodynamicznych właściwości mielonej skrobi. Zmniejszeniu uległy również wartości lepkości maksymalnej końcowej, lepkości w warunkach rozkładu, jak i lepkości powrotnej mikronizowanej skrobi. Skrobia taka wykazywała lepszą stabilność lepkości i mogła być przerabiana przy większych lepkościach.

EN

Grains of high-amylose maize starch (HAMS) were disintegrated (micronized) by jet milling with compressed air to alter their structure and properties. The disintegration resulted in decreasing the particle size in av. from 14.62 μm down to 6.14 μm, in changing the particle shape to an irregular one and crystal structure to the B-type. After jet milling, the particle distribution curves become narrow and uniform but the grains lost their smoothness and become rough. Their crystallinity decreased from 34.63% down to 24.19%. The milling did not result however in formation of any new functional groups. The enthalpy of thermal transition decreased after the milling. All pasting temps. and sp. viscosities of micronized HAMS pastes alsodecreased but they shower a better viscosity stability and could be processed to the higher viscosity than the pastes of native HAMS.

18

Nonlinear PTO effect on performance of vertical axisymmetric wave energy converter using semi-analytical method

Liu M., Liu H., Zheng X., Chen H., Wang L., Zhang L.

Polish Maritime Research

|

2017

|

S 3

49--57

EN

The wave energy, as a clean and non-pollution renewable energy sources, has become a hot research topic at home and abroad and is likely to become a new industry in the future. In this article, to effectively extract and maximize the energy from ocean waves, a vertical axisymmetric wave energy converter (WEC) was presented according to investigating of the advantages and disadvantages of the current WEC. The linear and quadratic equations in frequency-domain for the reactive controlled single-point converter property under regular waves condition are proposed for an efficient power take-off (PTO). A method of damping coefficients, theoretical added mass and exciting force are calculated with the analytical method which is in use of the series expansion of eigen functions. The loads of optimal reactive and resistive, the amplitudes of corresponding oscillation, and the width ratios of energy capture are determined approximately and discussed in numerical results.

19

Evolution of hierarchical structure and spatial pattern of coastal cities in China – based on the data of distribution of marine-related enterprises

Wang L., Xiao W., Wang C.

Polish Maritime Research

|

2017

|

S 3

58--64

EN

In this paper, a comprehensive research of the evolution of the hierarchical structure and spatial pattern of coastal cities in China was conducted based on the data of distribution of the headquarters and subsidiaries of marine-related enterprises in 1995, 2005 and 2015 using the city network research method proposed by Taylor. The results of the empirical research showed: China’s coastal city network had an obvious hierarchical characteristics of “national coastal cityregional coastal city-sub-regional coastal city-local coastal city”, in the 20 years of development process, the hierarchies of coastal cities in China showed a hierarchical progressive evolution; in past 20 years, the spatial pattern and network structure of coastal cities in China tended to be complete, and the city network was more uniform, forming a “three tiers and three urban agglomerations” network structure; the strength of connection among the cities was obviously strengthened, and the efficiency of urban spatial connection was improved overall.

20

Distribution and role of the genus Oithona (Copepoda: Cyclopoida) in the South China Sea

Wang L., Du F., Wang X., Li Y., Ning J.

Oceanologia

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2017

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No. 59 (3)

300--310

EN

The relationships between the small cyclopoid copepod Oithona and hydrological factors, phytoplankton and ichthyoplankton were evaluated using the data obtained in the central South China Sea (SCS) in summer 2014. The genus abundance ranged from 6.00 ind. m−3 to 93.75 ind. m−3 with high abundance band occurring in the branch of SCS Monsoon Jet. The lower temperature and higher salinity in the surface water of the band than other zones indicated that deep water intrusion was a positive factor for aggregation of the genus. The community structure of the genus was dominated by Oithona plumifera and Oithona similis made up 97% of the genus abundance associated with Oithona tenuis. The result of db-RDA analysis showed that the community structure of the genus was affected by temperature, Chl a, larval fishes and fish spawns, and temperature was the most important limiting factor. The result of GAMs analysis showed that abundance of O. tenuis, and copepodites were affected by Chl a, larval fishes and fish spawns; abundance of O. similis was affected by Chl a and fish spawns; and abundance of O. plumifera was affected by Chl a and larval fishes. Therefore, we suggest that the branch of SCS Monsoon Jet and deep water intrusion favor aggregation of plankton in the central SCS in summer. We confirm that the temperature is the limiting factor to the reproduction of the genus Oithona in tropic seas and the genus Oithona is a food-web linker between primary production and larval fishes in the central SCS.