Preferencje help
Polish version English version Język
Widoczny [Schowaj] Abstrakt
Liczba wyników

Znaleziono wyników: 10

Liczba wyników na stronie
Pierwsza strona wyników Pięć stron wyników wstecz Poprzednia strona wyników Strona / 1 Następna strona wyników Pięć stron wyników wprzód Ostatnia strona wyników

Wyniki wyszukiwania

help Sortuj według:

help Ogranicz wyniki do:
Pierwsza strona wyników Pięć stron wyników wstecz Poprzednia strona wyników Strona / 1 Następna strona wyników Pięć stron wyników wprzód Ostatnia strona wyników
1

Research on intelligent avoidance method of shipwreck based on bigdata analysis

100%
Li W., Huang Q.
Polish Maritime Research
|
2017
|
tom 24
|
nr Special Issue S3
In order to solve the problem that current avoidance method of shipwreck has the problem of low success rate of avoidance, this paper proposes a method of intelligent avoidance of shipwreck based on big data analysis. Firstly,our method used big data analysis to calculate the safe distance of approach of ship under the head-on situation, the crossing situation and the overtaking situation.On this basis, by calculating the risk-degree of collision of ships,our research determined the degree of immediate danger of ships.Finally, we calculated the three kinds of evaluation function of ship navigation, and used genetic algorithm to realize the intelligent avoidance of shipwreck.Experimental result shows that compared the proposed method with the traditional method in two in a recent meeting when the distance to closest point of approach between two ships is 0.13nmile, they can effectively evade.The success rate of avoidance is high
2

Socio-economic factors affecting agro-forestry technology adoption in Nyando, Kenya

81%
Magugu J. W., Feng S., Huang Q., Ototo G. O.
Journal of Water and Land Development
|
2018
|
nr 39
3

Phytoremediation of copper pollution by eight aquatic plants

81%
Lu D., Huang Q., Deng C., Zheng Y.
Polish Journal of Environmental Studies
|
2018
|
tom 27
|
nr 1
This study investigated the uptake capacity and bioaccumulation of heavy metal (Cu) in water using eight different aquatic plant species: Juncus effusus, Acorus calamus, Eichhornia crassipes, Sagittaria sagittifolia, Arundina graminifolia, Echinodorus major, Nymphaea tetragona and Pistia stratiotes. The results showed that Eichhornia crassipes and Pistia stratiotes have the best ability for bioaccumulation, while Arundina graminifolia, Nymphaea tetragona, and Acorus calamus also showed good bioaccumulation. However, Juncus effusus, Sagittaria sagittifolia, and Echinodorus major displayed very weak bioaccumulation. The enrichment capacity for Cu²⁺ in roots and shoots differed among species. Most of the Cu²⁺ was located in the shoot tissues of Juncus effuses, while for Sagittaria sagittifolia and Acorus calamus it accumulates in their root tissues. However, in the case of Echinodorus major the accumulation of copper content in root and shoot tissues is the same. The adsorption rates of heavy metal Cu in different aquatic plants were different. The adsorption rates of Eichhornia crassipus, Pistia stratiotes, Echinodorus major, and Nymphaea tetragona were higher than for Juncus effusus, Sagittaria sagittifolia, and Acorus calamus. When different aquatic plants reached the adsorption equilibrium, pH values were different. The Cu enrichment amount in aquatic plants was related to the content of lignin in plants, and the higher the content of lignin, the greater the amount of copper.
4

Relationships among raw materials, grinding ratios, and moisture content during the composting process

71%
Wang L., Huang Q., Wang S., Li G., Yang X.
Polish Journal of Environmental Studies
|
2019
|
tom 28
|
nr 1
Grinding materials as a pretreatment contribute to successful composting. Here the grinding ratio of 4 raw materials and compost samples with different maturity degrees were compared and discussed. Results revealed that the highest grinding ratio was obtained when drying the 3 straws into constant weight, but keeping water content around 10% for sewage sludge. The carbon-to-nitrogen ratio (C/N) was an important factor impacting the grinding ratio of raw materials except water content. Different straw materials had a decreased grinding ratio from the highest to the lowest in the following order: corn stover > rice straw > wheat straw. The grinding ratio of fermented compost significantly decreased lower than about 50% when the water content was higher than 30%, whereas no significant difference was observed when the water content was lower than 20%. Compared with original materials, mature compost had a better grinding ratio. Further regression analysis implies that grinding ratio had a negative linear orrelation with total organic carbon (TOC), C/N, hemicellulose, and cellulose, but no apparent correlation with pH, EC, GI, and lignin. Results reported here may provide an efficient way to save energy and investment in the industry production of pellet compost.
5

Analysis of future climate scenarios and their impact on agriculture in eastern Arkansas

71%
Magugu J. W., Feng S., Huang Q., Zhang Y., West G. H.
Journal of Water and Land Development
|
2018
|
nr 37
6

Laccase production by Trameteshirsuta, characterization, and its capability of decoloring chlorophyll

61%
Liu J., Liu W., Cai Y., Liao X., Huang Q., Liang X.
Polish Journal of Microbiology
|
2014
|
tom 63
|
nr 3
The present study focused on laccase production, characterization, and its involvement in chlorophyll decolorization. Extracellularlaccase, with the highest activity of 11 U/ml on day 8, was efficiently produced from Trametes hirsuta in 5 l bioreactor with optimized media comprising dual carbon sources, glucose and water hyacinth. A laccase was then purified from the supernatant to homogeneity with purification fold of 9.51 and recovery of 39.8% and an estimated molecular mass of 62 kDa by SDS-PAGE. The laccase showed activity at pH 2–6 and temperature 30–80°C and was relatively thermally stable at below 70°C and neutral pH. The laccase was applied to decolorize chlorophyll under different factors: temperature, pH, mediator, metal ions, and enzyme dosage. Other fungal laccases were also found to be able to degrade chlorophyll with rating from 52% to 88% following 1 h treatment with two laccase dosages (5 or 10 U/ml) in the absence of any other mediators at room temperature. These findings may be an important step in developing new, important, and commercially viable industrial applications for laccase enzymes.
7

Effects of land use on the amount and composition of dissolved organic matter in a Chinese headwater stream watershed

61%
Xu B., Huang Q., Li J., Li P., Xiang Y., Takahashi J.
Polish Journal of Environmental Studies
|
2016
|
tom 25
|
nr 1
The source and composition of dissolved organic matter (DOM) are important drivers of its biogeochemical role in aquatic environments. Different land use types may alter DOM amount and composition in freshwaters. Here, water samples were collected from the outlets of 16 subcatchments within mixed land use patterns in the South Tiaoxi River in Eastern China. Dissolved organic carbon (DOC), DOM absorption coefficient (α350), and fluorescence spectrum were measured. These 16 subcatchments were grouped into four clusters with different land use features: natural forest land, planted forest land (Phyllostachys praecox, a bamboo species), cropland, and residential land. Two humic-like and two protein-like fluorescent components were identified using parallel factor analysis (PARAFAC). DOC concentrations were the lowest in natural forest land dominated subcatchments as compared to other land uses with intensive anthropogenic activities, so did α350 and fluorescent intensities of different components. Protein-like fluorescence was more pronounced for the subcatchments dominated by residential land, while terrestrial humic-like fluorescence was the most abundant component for the subcatchments dominated by the other three land use types. The relationships between the percentage of cropland and that of fluorescence fraction appear to be a threshold response, indicating that effects on DOM composition varied with agricultural activity patterns. The reservoir would have a positive effect on DOM amount and the percentage of protein-like fluorescence associated with autochthonous activities. This study in general shows the impact of anthropogenic land use patterns on the amount and composition of DOM in headwater streams, which may affect ecosystem function and health of aquatic environments.
8

Spatiotemporal assessment of ecological security in a typical steppe ecoregion in inner Mongolia

51%
Li X., Li X., Wang H., Zhang M., Kong F., Li G., Tian M., Huang Q.
Polish Journal of Environmental Studies
|
2018
|
tom 27
|
nr 4
Ecological security is the comprehensive characterization of the noosystem’s overall collaborative capacity in relation to human welfare within a whole society. Recent years, however, have witnessed the excessive exploitation of natural resources via anthropogenic activities that have consistently triggered or accelerated ecological deterioration. In addition, an adequate ecological security assessment has yet to be conducted in a steppe ecoregion, especially when considering that the steppe is the major ecoregion category in China. In this study, we selected a typical steppe ecoregion in Inner Mongolia, northern China, as a representative region to conduct a spatiotemporal assessment of ecological security from both global and local perspectives. Along with an evaluation indicator system constituting 25 separate indicators covering three different systems (society, economy, and nature), we applied an improved grey target decision-making method in the initial indicator conversion process. As it pertains to weight determination, we employed a weight calculation method that weighed all indicators synthetically. Research findings indicated that a progressive deterioration of ecological security has been observed in the typical steppe ecoregion of China from 1990 to 2014, with a decline in the security situation and even more severe deterioration observed from a local perspective than a global perspective. Social and economic systems, specifically an excessive rural population and unreasonable development (mainly grazing and mining), were the major factors that promoted ecological security deterioration, while the natural system has contributed only slightly to this deterioration.
9

Prevalence and characterisation of class 1 and 2 integrons in multi-drug resistant Staphylococcus aureus isolates from pig farms in Chongqing, China

51%
Ye C., Hou F., Xu D., Huang Q., Chen X., Zeng Z., Peng Y., Fang R.
Journal of Veterinary Research
|
2020
|
tom 64
|
nr 3
10

Cotton (Gossypium hirsutum L.) genotypes with contrasting K+/Na+ ion homeostasis: implications for salinity tolerance

51%
Wang N., Qi H., Qiao W., Shi J., Xu Q., Zhou H., Yan G., Huang Q.
Acta Physiologiae Plantarum
|
2017
|
tom 39
|
nr 03
Pierwsza strona wyników Pięć stron wyników wstecz Poprzednia strona wyników Strona / 1 Następna strona wyników Pięć stron wyników wprzód Ostatnia strona wyników
JavaScript jest wyłączony w Twojej przeglądarce internetowej. Włącz go, a następnie odśwież stronę, aby móc w pełni z niej korzystać.