最新刊期
卷 62 ， 期 4 ， 2023
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Diversity of
Palaeocarya （Juglandaceae） fossil fruits from the Paleogene of Maoming Basin， Guangdong摘要：As a member of Juglandaceae， the fossil genus Palaeocarya Saporta， 1873， emend. Manchester， 1987 is well represented in the Cenozoic of the Northern Hemisphere， and it is characterized by a tri-lobed winged fruit. In China， Palaeocarya fossil record is mainly known from Hainan， Guangxi， Jilin and Yunnan. Here， we describe four species of Palaeocarya winged fruits from the upper Eocene and lower Oligocene of the Maoming Basin of Guangdong： Palaeocarya yunnanensis San-Ping Xie et Bai-Nian Sun， P. guangxiensis Li et Chen Y. F.，P. gaolingensis Yun-Fa Chen，and P. hispida H. H. Meng et Z. K. Zhou. This is the first fossil discovery of Palaeocarya in Guangdong， indicating that this genus had been distributed to low latitude subtropical region of China no later than the late Eocene， and had begun to diversify from that time.关键词：Maoming Basin;Palaeocarya;Juglandaceae;fossil fruit;phytogeography- 15
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发布时间：2023-11-01
- 摘要：Peats are structured and highly complex porous media, with unique hydro-mechanical responses. The complex behaviour of peats is affected by several soil properties, such as soil fabric, void ratio, and fibre content. The induced polarization (IP) technique measuring the real (σ΄) and the imaginary part (σ΄΄) of the complex electrical conductivity has been used to estimate the physical, chemical and hydrogeological properties of rock and soils. However, the relationships between electrical conductivity (σ΄ and σ΄΄) and those peat properties are rarely known. For this purpose, a modified hydraulic oedometer cell with electrical measurement was built for laboratory investigation. A series of tests on natural and reconstituted peat samples were performed. The test results show that the fabric anisotropy of fibrous peats plays a crucial role in the hydro-mechanical and electrical conductivity anisotropy. The degree of anisotropy decreases gradually during the consolidation process, accompanied by a decrease in σ΄, whereas the σ΄΄ is not significantly affected. Both the σ΄ and σ΄΄ are strongly increased with pore fluid conductivity σw, approximating power-law dependence on σw.关键词：electrical conductivity;soil fabric;anisotropic;pore fluid conductivity
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发布时间：2023-11-01 - 摘要：Identifying and analyzing the influence sphere and interaction intensity of urban logistics centers is conducive to optimizing the spatial distribution of logistics elements, which is of great significance to reduce costs and increase efficiency in the logistics industry. Firstly, this paper optimizes the measurement methods of comprehensive strength parameters and distance parameters in the gravity model by using the spatial syntax and word vector theory, combining the subjective feeling and preference law of logistics elements on the spatial structure with the spatial distribution form of the logistics supply and demand side, and realizes the identification of urban logistics center and the division of its gravity sphere of influence. Secondly, this paper constructs a complex network and presents the spatial interaction intensity between logistics centers by using chain weight. Finally, the dynamic and static forms of urban logistics centers are analyzed. Through spatial statistics and field investigation, it is found that: from the view of the distribution of the gravitational influence sphere, Zhengzhou's logistics industry has the spatial dynamic and static characteristics of taking the municipal district as the core and extending from the core to the east, west, and south. These characteristics are highly consistent with the spatial distribution of logistics-construction projects mainly supported in the planning documents. The space matching between the demand side and the supply side is very high. From the view of the spatial interaction intensity, in addition to the supply-demand relationship of materials, regional spatial accessibility also has a great influence on the spatial distribution of logistics elements. The planning and construction of infrastructure and logistics elements can enhance the spatial interaction between the core districts and surrounding areas, drive the upgrading of urban industries, and promote regional development.关键词：logistics center;spatial syntax;word vector;gravity model;spatial interaction
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发布时间：2023-11-01 - 摘要：Based on the daily precipitation data of 31 meteorological monitoring stations from 1961 to 2021 in the Guangdong-Hong Kong-Macao Greater Bay Area， the annual and seasonal （in the early and later flood seasons， respectively） characteristics and variation of torrential rain days， storm rainfall， rainstorm intensity， and contributions are analyzed by a combination of multi-methods， such as linear regression analysis， computation of trend coefficients and Mann-Kendall test. The results show that the annual mean torrential rain days and extremely heavy rainstorm days during 1961-2021 in the Greater Bay Area are separately 8.3 days and 1.8 days. About 87% of the total torrential rain days occur in the flood seasons with about 47% in the first season and 40% in the second season. The mean torrential rain days， storm rainfall， rainstorm intensity， and the rainstorm contribution of 31 meteorological monitoring stations of a year， the early flood season， and the later flood season in recent 61 years tend to change faintly， while the mean storm rainfall of six stations， such as Guangzhou， Huaiji and Doumen， show significant variations. The mean torrential rain days and their change rates of a year， the early flood season， and the later flood season in the Greater Bay Area are higher than that of Guangdong Province. After comparing the characteristics of storm rainfall in Hong Kong， Macao， and Guangzhou from 1961 to 2021， the values of mean torrential rain days， storm rainfall， rainstorm intensity and contribution are the largest in Hong Kong， followed by Macau and Guangzhou. However， Guangzhou shows maximum rates of change of annual storm rainfall and torrential rain days and rainstorm contribution in the early flood season.关键词：rainstorm;climate change;climate characteristics;Guangdong-Hong Kong-Macao Greater Bay Area
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发布时间：2023-11-01 - 摘要：By analyzing precipitation data from 1951 to 2018 at 86 meteorological stations in Guangdong Province， it is found that the precipitation slightly increases overall， with an annual period， and the increasing rates are different from year to year and from region to region， for example， the increasing rate of annual precipitation in central cities is 1.6 times of that of the whole province. Objective function values of Nash-Sutcliffe efficiency coefficient of Pearson-Ⅲ distribution and normal distribution are 0.965 and 0.845 respectively for its geographical distribution， 0.357 and 0.670 for its yearly temporal distribution， and 0.582 and 0.547 for decadal temporal distribution， implying that the annual precipitation in Guangdong is featured more geographically than temporally. The Cv values of the geographical， yearly， and decadal temporal distributions are 0.111， 1.643， and 0.138， respectively， indicating that the seasonal precipitation varies significantly， despite similar duration length （i.e.， 6-month rainy and 6-month dry seasons each year） it has a large peak-to-valley ratio which is far more than the ratios of spatial and temporal distributions. According to the area-cumulation of annual precipitation， regional rainfall patterns in Guangdong correspond to the three step-topography： 1） Plain to mid-hilly regions including the east coast， west coast， Pearl River Delta， and Qingyuan county are areas rich in rainfall； 2） The transitional regions from mid-hilly to northern mountain areas， and their two wing extensions are areas with medium rainfall； 3） Leeward regions of eastern， western and northern mountain areas and Leizhou Peninsula are areas poor of rainfall. In particular， there is a belt from the east Leizhou Peninsula to the western mountains， then to the front of northern mountains， and the eastern front of Wuyi mountains in Guangdong， forming a transitional zone separating areas of rich in rainfall and poor in rainfall， where annual precipitation is related logarithmically to ground elevations.关键词：topographical scale;annual precipitation;spatial and temporal distributions;Guangdong province
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发布时间：2023-11-01 - 摘要：Statistical modeling of landslide susceptibility requires both positive （landslide） and negative （non-landslide） samples， but historical records of landslides only contain information on positive data. Selecting negative samples from areas without historical landslide records is problematic because landslides could have occurred without being observed or will occur in the future. This problem is referred to as case-control sampling with contaminated controls， which will affect the predictive accuracy and robustness of statistical models. To address this problem， we propose applying a semi-supervised learning algorithm PBLC （positive and background learning with constraints） and investigate its effectiveness in landslide susceptibility modeling. Taking Eastern Guangdong Province as the study area， we select 11 environmental variables， including elevation， slope， aspect， profile curvature， the shortest distance from roads， the shortest distance from fault lines， the shortest distance from rivers， mean annual precipitation， normalized difference vegetation index， and spatial coordinates， to investigate the effectiveness of the PBLC algorithm. Experimental results show that traditional artificial neural network underestimates the probabilities of landslide occurrences， and the degree of underestimation is affected by the number of negative samples. By contrast， the predicted probabilities of landslide occurrences by PBLC are more accurate and robust. The predicted landslide susceptibility map by PBLC shows that the areas with high susceptibility class are concentrated in the northern and southwestern regions in Eastern Guangdong Province， and slope and elevation are two of the most important factors that affect landslide susceptibility in the study area. We conclude that the semisupervised learning algorithm PBLC is effective in addressing the case-control sampling with contaminated controls in landslide susceptibility modeling.关键词：landslide susceptibility;positive and background learning with constraints;artificial neural network;unlabeled data;Eastern Guangdong Province
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发布时间：2023-11-01 - 摘要：To investigate both NO production improvement and anti-diabetic effects of YouthyCome composite herbal tea （YCHT）， in this study， H9C2 cells， PC-12 cells and HUVEC cells were selected and incubated with different concentrations of YCHT for 24 hours， respectively. Cell survival and the content of nitric oxide （NO） inside and outside the cells were detected. After administration of YCHT to normal rats， the effect on fasting blood glucose was observed. The diabetic SD rats was set up by inducing with streptozotocin. The blood glucose value and the percentage of blood glucose decrease in each group were analyzed. By establishing high glucose drosophila model， the anti-diabetic effect of YCHT was further evaluated using body mass and trehalose level as indicators. The results showed that after treated with YCHT at a mass concentration up to 3.12，1.56 and 3.12 mg/mL corresponding to H9C2， PC-12， and HUVEC cells for 24 hours， respectively， their survival rates still maintained above 80%. It was found that after H9C2 and HUVEC cells were treated with 3.5 mg/mL YCHT， respectively for 24 hours， as well as PC-12 cells were treated with 1.5 mg/mL YCHT for 24 hours， the contents of NO in both cell supernatant and cell lysate increased significantly （P<0.05）. Compared the indicators including initial body mass， initial fasting blood glucose level， final experimental body mass and fasting blood glucose level， there was no significant difference between normal SD rat treated with 5.1 g/kg BW YCHT group and blank control group （P＞0.05）. In the low dose group （0.85 g/kg BW）， the value of fasting blood glucose decreased significantly at the end of the experiment （P<0.05）. In the meantime， treatment of YCHT amount to 5% culture mass decreased the body mass and trehalose content of high glucose drosophila melanogaster （P<0.05）. The results indicate that appropriate dosage of YCHT does not affect the survival of H9C2， PC-12， HUVEC cells， but improves the NO production in the cells. Treatment of YCHT at the dose of 5.1 g/kg BW to normal SD rats does not affect their body mass and fasting blood glucose. However， treatment of appropriate dose of YCHT reverses the increase of fasting blood glucose in diabetic SD rats， and the increases of body mass and trehalose content in diabetic drosophila.关键词：YouthyCome composite herbal tea;homology of medicine and food;diabetes mellitus;anti-diabetics;NO;diabetics prevention
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发布时间：2023-11-01 - 摘要：Whether the organic fertilizer can promote the synthesis of its own metabolites by strengthening crop nutrition， increasing the insect resistance of plants， thus affecting the physiological and biochemical indicators and population indicators of herbivorous insects and their predatory natural enemies that feed on plants， which can provide a theoretical basis for immunological methods of plant protection. In this study， “Glycine max - Aphis glycines - Harmonia axyridis” was taken as the research object， and six treatments of organic fertilizer and chemical fertilizer were constructed， namely， without aphid and without ladybug， with aphid and without ladybug， with aphid and ladybug； The plant height， aboveground and underground biomass of soybean in each treatment group， the population dynamics of soybean aphid， the development duration of ladybug， pupa weight and the SOD/CAT/GST activity level of soybean， aphid and ladybug in each treatment group were measured.The main results are as follows：（1） Applying organic fertilizer on the soybean plant with “aphids and ladybird” closest to the field situation will lead to significant “dwarfing” of the soybean plant （-12.3%， P=0.021 1）. （2） On the 7th day， organic fertilizer significantly reduced the number of soybean aphids in seedling stage （-25.9%， P=0.024 9， P=0.057 5）， and the number of winged aphids in the fifth observation point （-40.7%）. （3） Organic fertilizer increased the weight of ladybird pupae （2.4%）， shortened the larval （-2.5%） and pupal development duration （-13.4%） of ladybirds. （4）The activity of soybean stress resistant enzyme was significantly affected by organic fertilizer. The activity of SOD decreased by 20.7%， the activity of CAT increased by 14.8%， and the activity of GST increased by 27.8%. Organic fertilizer can optimize crop characters when aphids and ladybirds are close to the actual conditions in the field， and inhibit the neutral population of phytophagous insects regulated by both plant hosts and ladybird natural enemies； The number of winged aphids decreased， and the potential of virus transmission decreased； It can provide better nutritional conditions for ladybird natural enemies， such as pupa weight gain， accelerating development of young larvae， etc.Therefore， organic fertilizer has a positive impact on the enhancement of plant pest immunity.关键词：Harmonia axyridis;carbon-based organic fertilizer;tertiary nutrition system;anti-stress enzyme
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发布时间：2023-11-01 - 摘要：According to the structure feature of indole quinazoline alkaloids（IQAs），under the guidance of TLC，LC-MS and GNPS（global natural products social molecular networking），IQAs from sponge-associated fungus Aspergillus giganteus MA 46-5 were studied and ten IQAs were isolated from rice medium of MA 46-5. Based on NMR，HR-ESI-MS，OR，CD and comparison with the literature，their structures were determined as tryptoquivaline （1），nortryptoquivaline （2），deoxytryptoquivaline （3），deoxynortryptoquivaline （4），aspertoryadin C （5），aspertoryadin G （6），quinadoline A （7），fiscalin E （8），quinadoline B （9） and prelapatin B （10）. 8 and 10 were isolated from Aspergillus for the first time，and 2，4-7 were firstly obtained from Aspergillus giganteus.关键词：sponge-associated fungus;Aspergillus giganteus MA 46-5;indole quinazoline alkaloids（IQAs）
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发布时间：2023-11-01 - 摘要：Sludge incineration， as the best practical way to practice the principle of sludge volume reduction， which is currently widely used in coal-fired power plants and waste incineration plants. Since the inorganic content in the sludge is generally in the high level in recent years， it is necessary to add combustion materials to the sludge for incineration to effectively utilize the sludge resources. How to improve the unit content in the sludge has become an important issue in reducing the cost of sludge incineration. Studies have shown that the acid leaching treatment of sludge can release the metal elements in the sludge into the liquid phase. In this paper， the relationship between sludge acid treatment， organic matter content and sludge calorific value of sludge and inorganic elements of sludge caused by acid modification was investigated through gradient acid modification experiments of hydrochloric acid in the sludge of the sewage plant in Dongguan town， the sewage plant in Jiangmen and the sewage plant in Shanwei.The experimental results showed that the acid modification of the sludge increased the calorific value of the dry sludge of the three sewage plants by 4 106.7， 3 118.5 and 2 669.7 kJ/kg， respectively， and the proportion of the original sludge increased by 38.14%， 35.06% and 23.21%， respectively.关键词：sludge incineration;acid modification;sludge recycling
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发布时间：2023-11-01 - 摘要：The material used for the lower head of the advanced pressurized water reactor pressure vessel is low-carbon steel SA508. The surface of SA508 is easy to oxidize， which may have a significant impact on the Critical Heat Flux （CHF） of the In-Vessel Retention （IVR） strategy， thus affecting the safety margin of the strategy. In this study， the influence of the different degrees of surface oxidation on CHF of low-carbon steel SA508 was first investigated through experiments. Then the CHF enhancement effect of nanofluid was studied under the condition of surface oxidation of low-carbon steel. It was found that the surface oxidation of low-carbon steel SA508 significantly affected the CHF in downward-facing pool boiling. With the deepening of the oxidation degree， CHF increased rapidly and finally reached stability. The stability value of CHF under complete surface oxidation was about two times that under slight surface oxidation. Boiling experiments were carried out on the surface of fully oxidized low-carbon steel in a nanofluid. It was found that the nanofluid could continue to increase the CHF of the fully oxidized surface， but the effect was significantly reduced. The increase in CHF was due to the water absorption ability of the surface nano-particle deposition layer. The results may help determine the actual safety margin of IVR and which is the effective enhancement method.关键词：IVR（in-vessel retention） strategy;surface oxidation;nanofluids;CHF（critical heat flux） enhancement effect
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发布时间：2023-11-01 - 摘要：In order to simulate the conjugate heat transfer problem； a calculation program for simulating fluid-solid conjugate heat transfer problems is developed on the MOOSE platform based on the finite element algorithm. The traditional continuous Galerkin finite element method is used to solve the structural heat transfer problem in the solid region. The SUPG/PSPG stabilization algorithm is introduced to solve the oscillation problem caused by convection-dominated equation of flow and the problem of velocity and pressure decoupling. The k-ω turbulence model is used to solve the turbulent flow. For the conjugate heat transfer problem in the whole field， the program uses a fully coupled implicit scheme to solve it. The program is validated by comparing with the experimental and theoretical results for basic flow and conjugate heat transfer cases. The results show that the calculation results are in good agreement with the experimental data and DNS results. Therefore， the program developed in this study has the ability to compute incompressible flow with heat transfer， solid heat transfer， conjugate heat transfer， and related problems.关键词：conjugate heat transfer;finite element method;multi-physical field coupling;turbulence modeling;validation and verification
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发布时间：2023-11-01 - 摘要：In order to explore the hydrodynamic characteristics of a tidal current turbine under a water-sediment environment， the CFD-DPM model is employed to study the effect of sand particles on the airfoil lift and drag coefficients of 120 kW tidal current turbine blade. Based on the blade element momentum theory（BEM）， the 120 kW tidal current turbine power is calculated. From the perspective of blade design， the method to make full use of or reduce the influence of sand particles on the power of the tidal current turbine is put forward. The results show that when the particle diameter is 20 μm， as the concentration of sand grains increases， the sand particle can improve the tidal current turbine power. When the particle diameter is 2 500 μm， the particle will reduce the power. As the angle of attack increases， the lift coefficient increases， and the effect of the sand particle on the lift and drag coefficients is enhanced. Airfoils with a small lift coefficient would receive power improvement with small particles or power loss reduction with large particle diameters.关键词：tidal current turbine;lift and drag coefficients;CFD-DPM;blade element momentum theory（BEM）
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发布时间：2023-11-01 - 摘要：At the future Compact Linear Collider （CLIC）， the production process of triboson WWZ in the Standard Model was simulated and analyzed. This process has important significance for the study of triple-gauge-boson coupling and is also an important background for some possible new physics signals. Focusing on the signal channel
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发布时间：2023-11-01 - 摘要：Large settlements of soft soil foundation occur under cyclic loading. The influence of cyclic deviatoric stress on the dynamic characteristics of soft soil has been previously analyzed using dynamic triaxial tests， while the effect of cyclic confining pressure has rarely been considered. In this study， a series of undrained dynamic triaxial tests with variable confining pressure were conducted for saturated soft soil from the Pearl River Delta using GDS dynamic triaxial test system. The coupling effects of cyclic deviatoric stress and confining pressure on the cumulative axial strain， pore pressure， and damping ratio were analyzed. The results show that the cumulative axial strain and normalized damping ratio decrease with the increase of the cyclic confining pressure， while the maximum and minimum pore pressures increase with the increase of the cyclic confining pressure. When the number of cycles N=1 000 and the stress path η increased from 0.33 to 1.00 and 2.00， the accumulated axial strain εp decreased from 4.04% to 3.52% and 2.45%， the normalized damping ratio λN/λ1 from 0.253 to 0.269 and 0.217， the maximum pore pressure umax increased from 60.55 kPa to 79.25 kPa and 104.51 kPa， and the minimum pore pressure umin increased from 58.69 kPa to 71.12 kPa and 80.90 kPa. Furthermore， a model for predicting the accumulated axial strain of saturated soft soil is established and verified. These results are helpful to deepen the understanding of the mechanical properties of soft clay under cyclic loading.关键词：soft soil;dynamic triaxial test;accumulated axial strain;excess pore water pressure;damping ratio;the Pearl River Delta
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发布时间：2023-11-01 - 摘要：To optimize the design of the arch axis of bridges， we propose a scheme with a set of Kriging surrogate models focusing on the stress distribution of axes. The Kriging model is used to express the implicit function relationship between stress-optimizing objective and design variables. Meanwhile， the Surrogate-Based Optimization （SBO） algorithm with Expected Improvement （EI） criterion is adopted as the infill sampling criterion and the Particle Swarm Optimization （PSO） algorithm is selected as a sub-optimization algorithm. By analyzing the curve functions of circle， parabolic， catenary， and cubic spline， the variables to be optimized for these common arch axes were determined. The calculation method of objective function value which can represent the global stress level of the arch axis and the specific flow of optimization are presented. An engineering example is analyzed which verifies the feasibility of the scheme. The results show that the best arch-axis design of cubic spline reduces the maximum stress of the arch by 67% and the stress variance of the key section by 97%. Our study provides more options for the shape design of arch bridges and also has reference significance for the optimization of the arch axis with stress as the target.关键词：bridge engineering;optimization of arch axis;Kriging model;expected improvement criterion;particle swarm optimization
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发布时间：2023-11-01 - 摘要：Effectively quantifying the thermal performance of the clothed human body during exercise and to predict the thermal performance when wearing clothing in advance， are of great significance for health monitoring and analysis， and accident prevention. In this study， a mathematical model of a clothed human during exercise is selected to predict the thermal performance by considering the quantified effects of clothing pumping effect in the human-clothing-environment boundary model. With comprehensive consideration of the convenience of industry applications and the computability of the complex mathematical model， simulation framework is proposed， according to which， a CAD system of the clothed-human’s thermophysiology is developed. The CAD system can predict the thermophysiological responses of the human body in advance when wearing different kinds of clothing and consequently prevent occurring of thermal-related accident during exercise. It can be implemented to the development of thermal-functional clothing， and have the advantage of saving time， manpower and other unnecessary cost as compared with the traditional clothing development process.关键词：clothing pumping effect;clothed human;thermal performance simulation;CAD system
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发布时间：2023-11-01 - 摘要：By taking the controlled two-compartment model with two slow excitation frequencies as an example， the influence of different frequency on the dynamics as well as the generation mechanism of the various complex behaviors is investigated. A slow variable expression is used to model multiple external excitation terms， and the system is transformed into a coupled fast and slow hybrid system. From the traditional point of view of fast and slow analysis， the relationship between bifurcation mode and corresponding bifurcation behavior and slow variable parameters is explored. It is found that the system can generate multi-mode bursting oscillations if there exists an order gap between the exciting frequency and the natural one. Our results show that different frequencies have great influence on the bifurcation structure of the system. It is indicated that both of the multi-equilibria states and various bifurcation behaviors are coexisted in the equilibrium curves， thus further multi-mode bursting oscillations can be observed in the controlled system with different stimulus values .关键词：two-compartment model;different exciting frequencies;bursting;fast-slow analysis;bifurcation
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发布时间：2023-11-01 - 摘要：The long-time behavior of solutions in the time-dependent functional space for the Kirchhoff-type wave equation with strong nonlocal damping and nonlinear perturbations are concerned. The existence of time-dependent global attractor is achieved by using the contraction function method to verify the asymptotic compactness of the process.关键词：strong nonlocal damping;Kirchhoff-type wave equation;contraction function;time-dependent attractor
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发布时间：2023-11-01 - 摘要：Some new characterizations on Gorenstein injective, projective and flat modules with a semidualizing R-module C are given by Auslander categories over a commutative noetherian local ring R.关键词：semidualizing module;Auslander category;GC -projective(injective, flat) module
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发布时间：2023-11-01
Research articles
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