Wyniki wyszukiwania

1

Ground sediment transport model and numerical simulation

100%

Sun J.

Polish Journal of Environmental Studies

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2016

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tom 25

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nr 4

Geological disasters caused by city ground subsidence are typical examples of soil failure, which significantly impact urban planning and development. The sediment transport in the soils leads to the increasing porosity of soils, and changes the elastic modulus and Poisson’s ratio, thus the carrying capacity of the soil is reduced and ground subsidence appears. Therefore, the sediment transfer and loss driven by the underground water becomes a key reason for ground subsidence. Studies in this area thus present significant meanings. In this paper, mutual effects between the sediment particles and groundwater seepage are analyzed. We partially fix sediments in soils. Using the numerical simulation, hydraulic pressure is applied to scour so as to study the regular patterns of sediment transport in the soil mass: as time extended, the porosity in soils is gradually enlarged, tending to be stable; as more particles are fixed, porosity is reduced. It is also found that fixed particles, with a part of free sediment particles, form some new fixed sediment structures that hinder the transfer of the free sediment. In addition, parameters like scour time, hydraulic pressure, and the porosity evolution equation relating to the amount of fixed sediment particles are acquired. Findings of this research are expected to provide references for predicting, forecasting, and treating ground subsidence, which is led by sediment transport from the perspective of the soil mass porosity evolution.

2

Stability and support analysis of coverage rock-soil aggregate of longhuguan landslide

63%

Sun J., Zhou F.

Polish Journal of Environmental Studies

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2017

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tom 26

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nr 6

Rock-soil aggregate landslides are distributed all over the world and have done great harm to transportation networks, buildings, personal safety, and city construction. Although landslide studies usually focus on the slope of the single homogeneous material, few slopes are composed of or covered by various complicated geomaterials. This paper proposes a calculation model of the slope covered by rock-soil aggregate and analyzes Longhuguan landslide in Guangxi, China, considering rainfall. Fully considering the weak surface, a support design plan is given.The unbonded cable is taken to support the landslide, the concrete beams are adopted on the angle turning point of the surface, and the slide-resistant piles are used to jointly support the front edge of the slope. Top fissures are blocked and landslide drainage measures are taken. The displacement monitoring proves that the support is effective. This study can provide many references for landslide support and analysis covered by rock-soil aggregate.

3

Netz-Phytoplankton Diversity in the western and Southern regions of the South China Sea

63%

Liu H., Sun J.

Oceanological and Hydrobiological Studies

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2015

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tom 44

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nr 4

4

A novel lectin with antiproliferative activity from the medicinal mushroom Pholiota adiposa

51%

Zhang G. Q., Sun J., Wang H. X., Ng T. B.

Acta Biochimica Polonica

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2009

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tom 56

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nr 3

415-421

Little was known about biological activities of compounds from the medicinal mushroom of the genus Pholiota. A lectin from the Pholiota adiposa has now been isolated and its properties tested. The isolation procedure included ion exchange chromatography on DEAE-cellulose and CM-cellulose, and fast protein liquid chromatography-gel filtration (FPLC) on Superdex 75. The lectin was composed of two identical subunits, each with a molecular mass of 16 kDa. Its N-terminal amino-acid sequence showed little similarity to sequences of other Agaricales lectins. The hemagglutinating activity of the lectin was stable at temperatures up to 50oC, and in NaOH and HCl solutions with concentrations less than 25 mM. It was inhibited by inulin (12.5-200 mM), but enhanced by Cu2+ (6.25-25 mM), Fe2+ (12.5-25 mM), and Al3+ (6.25-25 mM) ions. The lectin showed antiproliferative activity toward hepatoma Hep G2 cells and breast cancer MCF7 cells with an IC50 of 2.1 μM and approximately 3.2 μM, respectively. It exhibited HIV-1 reverse transcriptase inhibitory activity with an IC50 of 1.9 μM. When compared with P. aurivella lectin, the only Pholiota lectin published to date, P. adiposa lectin differs in chromatographic behavior, molecular mass, N-terminal sequence, and effect of cations on hemagglutinating activity. In the case of the lectin from P. aurivella, its antifungal, antiproliferative, and HIV-1 reverse transcriptase inhibitory activities have not been determined.

5

A novel multi-objective discrete particle swarm optimization with elitist perturbation for reconfiguration of ship power system

51%

Zhang L., Sun J., Guo C.

Polish Maritime Research

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2017

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tom 24

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nr Special Issue S3

A novel multi-objective discrete particle swarm optimization with elitist perturbation strategy (EPSMODPSO) is proposed and applied to solve the reconfiguration problem of shipboard power system(SPS). The new algorithm uses the velocity to decide each particle to move one step toward positive or negative direction to update the position. An elitist perturbation strategy is proposed to improve the local search ability of the algorithm. Reconfiguration model of SPS is established with multiple objectives, and an inherent homogeneity index is adopted as the auxiliary estimating index. Test results of examples show that the proposed EPSMODPSO performs excellent in terms of diversity and convergence of the obtained Pareto optimal front. It is competent to solve network reconfiguration of shipboard power system and other multi-objective discrete optimization problems

6

Dynamics and controls of carbon use efficiency across China’s grasslands

51%

Hou G., Sun J., Wang J.

Polish Journal of Environmental Studies

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2018

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tom 27

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nr 4

China’s grasslands play a significant role in the carbon cycle. Accurately evaluating carbon use efficiency (CUE) of grassland ecosystems is of great importance. Therefore, we adopted moderate resolution imaging spectroradiometer documents to explore dynamics and controls of CUE across grasslands of China from 2001 to 2010. Results demonstrated that CUE presented an increasing trend (0 to 0.0067 year⁻¹) in the most studies regions except for desert steppe (-0.0046 to 0 year⁻¹). At spatial scale, the precipitation, temperature, and aridity index significantly regulated the dynamics of CUE in alpine grasslands. Furthermore, the different mechanisms are explored at the transect scale, and CUE revealed the positive correlation with aridity index (R² = 0.92, P<0.0001) and precipitation (R² = 0.88, P<0.0001), but a negative correlation with temperature (R² = 0.92, P<0.0001) in alpine grasslands. However, in temperate grasslands, CUE exposed the negative correlation with aridity index (R² = 0.40, P<0.0001) and precipitation (R² = 0.54, P<0.0001), but a positive correlation with temperature (R² = 0.56, P<0.0001). Moreover, precipitation was decreasing with the increased temperature in the alpine grasslands (R² = 0.85, P<0.0001) and temperature of grasslands (R² = 0.19, P<0.0001). In conclusion, CUE had a slight increased trend across grasslands in China, with higher precipitation, aridity index, and lower temperature promoting CUE in the alpine region – nevertheless restraining the CUE variations in grassland temperature. The better heat and water conditions in temperate grasslands than in alpine grasslands resulted in higher CUE in temperate grasslands.

7

45%

Lou X.-D., Wang H.-D., Xia S.-J., Skog S., Sun J.

Archivum Immunologiae et Therapiae Experimentalis

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2014

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tom 62

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nr 4

13

A novel alkaline protease with antiproliferative activity from fresh fruiting bodies of the toxic wild mushroom Amanita farinosa

45%

Sun J., Zhao Y., Chai H., Wang H., Ng T. B.

Acta Biochimica Polonica

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2011

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tom 58

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nr 4

A novel protease with a molecular mass of 15 kDa was purified from fresh fruiting bodies of the wild mushroom Amanita farinosa. The purification protocol entailed anion exchange chromatography on DEAE-cellulose, affinity chromatography on Affi-gel blue gel, cation exchange chromatography on SP-Sepharose, and gel filtration by fast protein liquid chromatography on Superdex 75. The protease was unadsorbed on DEAE-cellulose but adsorbed on Affi-gel blue gel and SP-Sepharose. It demonstrated a single 15-kDa band in sodium dodecyl sulfate-polyacrylamide gel electrophoresis (SDS/PAGE) and a 15-kDa peak in gel filtration. The optimal pH and optimal temperature of the protease were pH 8.0 and 65 °C, respectively. Proliferation of human hepatoma HepG2 cells was inhibited by the protease with an IC50 of 25 µM. The protease did not have antifungal or ribonuclease activity.

14

Effect of lactic acid fermented soyabean meal on the growth performance, intestinal microflora and morphology of weaned piglets

45%

Wang N. F., Chen Q., Le G. W., Shi Y. H., Sun J.

Journal of Animal and Feed Sciences

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2007

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tom 16

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nr 1

75-85

15

Epidemiological evidence of the effects of environmental pollution on male reproductive health in an electronic waste-recycling Town

45%

Du H., Yu M., Sun J., Song G., Li Y.

Polish Journal of Environmental Studies

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2016

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tom 25

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nr 4

In recent years have seen increasing evidence linking occupational and environmental exposure to toxic pollutants with human male reproductive disorders. The aim of this study was to collect epidemiological information on male reproductive health to explore the effects of electronic waste (e-waste) environmental pollution on male genital health in Wenling, one of the world’s biggest e-waste recycling centers. We collected clinic information from 2001 to 2012 in Wenling covering male reproductive diseases, including prostatitis, epididymitis, orchitis, urinary tract infections, cystospermitis, impotence, condyloma accuminatum, syphilis, gonorrhea, varicocele, genital herpes, prostatic carcinoma, etc. The morbidity of male reproductive diseases in Wenling was higher than in the control area – especially those diseases that could be influenced by environmental factors. Male reproductive health may be threatened by e-waste pollution in Wenling, and this could influence local population diathesis.

16

Research an a method of hull form design based on wave-making resistance optimization

45%

Sun J., Lv X., Liu W., Ning H., Chen X.

Polish Maritime Research

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2012

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tom 19

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nr 3

In this paper, we consider an optimization of the hull shape in order to minimize the total resistance of a ship. The total resistance is assumed to be the sum of the wave resistance computed on the basis of the thin-ship theory and the frictional resistance. Smoothness of hull lines is proved with mathematical procedure, in which differentials of the hull lines functions are analyzed. The wave-making resistance optimization, involving a genetic algorithm, uses Michell integral to calculate wave resistance. A certain hull form is generated by the method using cross section information of a modified DTMB model ship 5415 and a comparative experiment is carried out. Experimental and calculation result show that the method is of good adaptability for designing certain types of ships with excellent resistance performance

17

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Preservation of mushroom in storage after vacuum cooling treatment

45%

Fei T., Min Z., Sun J.

International Agrophysics

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2005

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tom 19

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nr 4

292-297

18

Exogenous spermidine maintains the chloroplast structure of cucumber seedlings and inhibits the degradation of photosynthetic protein complexes under high-temperature stress

39%

Wang L., Zhou H., Guo S., An Y., Shu S., Lu N., Sun J.

Acta Physiologiae Plantarum

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2018

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tom 40

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nr 03

19

Potential of rapid anaerobic fermentation on animal slurry for biogas production and storage of biogas slurry

39%

Liang J., Sun J., Mahmood A., Basir A., Ashraf I., Yang S.

Polish Journal of Environmental Studies

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2021

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tom 30

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nr 1

20

The effects of grafting on glycolysis and the tricarboxylic acid cycle in Ca(NO3)2-stressed cucumber seedlings with pumpkin as rootstock

39%

Li L., Xing W.-w., Shao Q.-s., Shu S., Sun J., Guo S.-r.

Acta Physiologiae Plantarum

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2015

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tom 37

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nr 12

In this research, we investigated the effects of grafting on intermediate metabolites and key enzymes of glycolysis and the tricarboxylic acid (TCA) cycle in selfgrafted and salt-tolerant pumpkin rootstock-grafted cucumber seedlings supplied with nutrient solution and subjected to 80 mM Ca(NO₃)₂ stress for 6 days. Ca(NO₃)₂ stress induced accumulation of 3-phosphoglycerate (3- PGA) and phosphoenolpyruvate (PEP) in the leaves of selfgrafted cucumber seedlings and enhanced the activities of phosphoenolpyruvate carboxylase (PEPC) and enolase (ENO). Succinic acid and malic acid contents and isocitrate dehydrogenase, succinate dehydrogenase (SDH), and malate dehydrogenase (MDH) activities in self-grafted seedlings were significantly decreased by Ca(NO₃)₂ stress. In addition, activities of PEPC, ENO, SDH, and MDH and contents of glycolysis intermediate metabolites (citric, succinic, and malic acids) were significantly higher in leaves of rootstock-grafted seedlings compared with those in self-grafted seedlings under saline conditions. Furthermore, leaf adenosine triphosphate (ATP) content of rootstock- grafted seedlings was relatively higher than that in self-grafted plants under salt stress, with an opposite effect observed on adenosine diphosphate content. These results indicate that rootstock grafting alleviates Ca(NO₃)₂ stressinduced inhibition of the glycolytic pathway and the TCA cycle in cucumber seedling leaves, which may aid the respiratory metabolism of cucumber seedlings and help maintain a high ATP synthesis level, thereby increasing the biomass of cucumber seedlings and enhancing their salt tolerance.

Ograniczanie wyników

Ground sediment transport model and numerical simulation

Stability and support analysis of coverage rock-soil aggregate of longhuguan landslide

Netz-Phytoplankton Diversity in the western and Southern regions of the South China Sea

A novel lectin with antiproliferative activity from the medicinal mushroom Pholiota adiposa

A novel multi-objective discrete particle swarm optimization with elitist perturbation for reconfiguration of ship power system

Dynamics and controls of carbon use efficiency across China’s grasslands

Warm currents affecting the spring and winter distributions of living coccolithophores in the Yellow Sea, China

Soil respiration in response to a short-term nitrogen addition in an alpine steppe of Northern Tibet

The impact of climate change and human activity on net primary production in Tibet

Toxicity evaluation of antibiotics in piggery wastewater by luminescent bacteria

Effects of climate change and human activity on runoff in a typical loess gullied-hilly region watershed

Effects of resveratrol on the expression and DNA methylation of cytokine genes in diabetic rat aortas

A novel alkaline protease with antiproliferative activity from fresh fruiting bodies of the toxic wild mushroom Amanita farinosa

Effect of lactic acid fermented soyabean meal on the growth performance, intestinal microflora and morphology of weaned piglets

Epidemiological evidence of the effects of environmental pollution on male reproductive health in an electronic waste-recycling Town

Research an a method of hull form design based on wave-making resistance optimization

Preservation of mushroom in storage after vacuum cooling treatment

Exogenous spermidine maintains the chloroplast structure of cucumber seedlings and inhibits the degradation of photosynthetic protein complexes under high-temperature stress