Wyniki wyszukiwania - Biblioteka Nauki

1

Optimization of process parameters for pharmaceutical wastewater treatment

100%

Zhang C. , Huang J.

Polish Journal of Environmental Studies

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2015

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tom 24

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nr 1

EN

Pharmaceutical wastewaters are generated through complex manufacturing processes that contain a variety of organic and inorganic constituents, and are usually characterized by a high concentration of chemical oxygen demand (COD), suspended solids, dissolved solids (salts), toxicity, and refractory compounds. In this paper, wet peroxide oxidation (WPO) was adopted to treat pharmaceutical wastewater. Central composite design, an experimental design for response surface methodology (RSM), was used to create a set of 30 experimental runs needed for optimizing operating conditions. The experimental results show that WPO could effectively reduce COD by 97.5% at optimum conditions: temperature is 260ºC, H₂O₂ excess (HE) is 0, the initial concentration of pharmaceutical wastewater is 45,000 mg/L, and reaction time is 10 min. WPO process is possibly suitable for a primary treatment for pharmaceutical wastewater. Response surface methodology (RSM) could be effectively adopted to optimize the operating multifactors in a complex WPO process.

2

Application of longdistance pipeline transportation in metallurgical industry of China

100%

Huang J. , Wang S.

Zeszyty Naukowe Akademii Rolniczej we Wrocławiu. Melioracja

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1988

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nr 31

3

A method for calculating the hydraulic gradient of high-concentration iron ore concentrate slurry in a pipeline

100%

Huang J. , Zou W.

Zeszyty Naukowe Akademii Rolniczej we Wrocławiu. Inżynieria Środowiska

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1992

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tom 01

4

The circadian rhythms of photosynthesis, ATP content and cell division in Microcystis aeruginosa PCC7820

80%

Huang J. , Wang J. , Xu H.

Acta Physiologiae Plantarum

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2014

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tom 36

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nr 12

EN

Microcystis aeruginosa is one of the most common blue-green algae species that forms harmful water bloom, which frequently causes serious ecological pollution and poses a health hazard to animals and humans. To understand the progression of algal blooms and to provide a theoretical basis for predicting and preventing the occurrence of algal blooms and reducing the harm of algal bloom to environment, we investigated the diurnal variation of photosynthesis, ATP content and cell division in M. aeruginosa PCC7820. The results showed that the photosynthesis and ATP content of M. aeruginosa PCC7820 exhibited clear circadian rhythm with a period of approximately 24 h and that the periodic rhythms continued for at least three cycles under continuous light conditions. Furthermore, the period length showed that a temperature compensation effect and changes in light cycle or temperature could reset the phase of circadian rhythm. These results indicate that the circadian rhythms of physiological process in M. aeruginosa PCC7820 are controlled by the endogenous circadian clock. Examinations of the number, size and cytokinin content of cells also reveal that the cell division of M. aeruginosa PCC7820 with the generation time of 38.4 h exhibits robust circadian rhythms with a period close to 24 h. The circadian rhythms of cell division may be generated by a biological clock through regulation of the cell division phase of M. aeruginosa PCC7820 via a gating mechanism. The phases in which cell division slows or stop recur with a circadian periodicity of about 24 h.

5

Spatial and seasonal variations in the planktonic ciliate community and its relationship with environmental factors in Daya Bay, the South China Sea

80%

Wu F. , Huang J. , Qi Z. , Huang H.

Oceanological and Hydrobiological Studies

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2017

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tom Vol. 46, No. 2

212--222

EN

Planktonic ciliate composition, abundance and its response to environmental change were investigated during four seasons (winter of 2013, spring, summer and autumn of 2014) in Daya Bay, the South China Sea. A total of 41 species belonging to eight orders were identified, 14 of which were dominant. Planktonic ciliate communities showed a distinct seasonal pattern in ciliate abundance and a clear seasonal shift in the taxonomic composition. The largest number of ciliate species occurred in summer, whereas the highest abundance peaked in spring, mainly due to oligotrichids. In terms of spatial distribution, ciliate species were abundant in the area of artificial reefs, and ciliate abundance was higher in the Dapeng Cove aquaculture area and lower at the Daya Bay Nuclear Power Station. Clustering analysis demonstrated that the seasonal variations of the ciliate community structure were more obvious than spatial variations. Multivariate and univariate analyses illustrated that ciliate abundance was significantly correlated with the water nutrient level and chlorophyll-a concentration, temperature, salinity and dissolved oxygen. Moreover, the dominant abiotic environmental factors affecting the spatial pattern of ciliate communities varied between seasons.

6

Experiment and modeling of soil-water characteristic curve of unsaturated soil in collapsing erosion area

80%

Liu W. , Luo X. , Fu M. , Huang J.

Polish Journal of Environmental Studies

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2016

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tom 25

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nr 6

EN

Soil erosion tends to occur with rainfall runoff, thus leading to grave soil and water loss. An increase of water content in soil caused by rain makes the loss of matrix suction and the decrease of shear strength obvious, and will promote soil erosion. The soil-water characteristic curve (SWCC) can be used to describe the relationship between the water content and the matrix suction in unsaturated soil. For this paper we studied the SWCCs of the granite residual soils in a collapsing erosion area in Jiangxi Province, China. A GEO-Experts pressure plate extractor was used to measure SWCCs for soils with different dry density, grain size, drying and wetting cycles, and lime content. The initial dry density has a significant impact on SWCC. With increasing dry density, the suction was decreased for the same water content. The larger the grain size, the greater the suction value for the same volumetric water content. Under the same suction, the volumetric water content decreases as the lime percentage increases and water stability improves. SWCCs of the drying and wetting cycle demonstrate the hysteresis phenomenon. The area of the hysteresis loop decreased with the increase of the dry density and drying and wetting cycle number. It also became small when the soils were mixed with lime. In this paper, the Van Genuchten model, the Fredlund and Xing model, and the Gardner model were used to fit the experimental data of SWCCs. The presented fitting parameters show that the residual sum of squares is less than 0.002. All the experimental data fit well to three models for SWCC. The results indicated that the simulated value of the Gardner model does provide best agreement with the measured value. These results will provide an important basis for the further study of the soil collapsing erosion process and soil cover design.

7

Assessing social-ecological system resilience in mainland China

80%

Hu M. , Zhang J. , Huang J.

Polish Journal of Environmental Studies

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2018

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tom 27

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nr 3

EN

Rapid and extensive economic development in China has resulted in a dramatic increase in the consumption of energy and resources with negative ecological effects. This study sought to define the concept of social-ecological systems (SES) resilience to determine whether a given system can effectively withstand these adverse effects per its quantitative level of resilience. The information entropy method and set pair analysis were adopted to determine SES resilience indicators, including the vulnerability and response capacity of social, economic, and ecological subsystems. Thirty-one provincial regions in mainland China were taken as examples and their respective SES resilience levels were empirically measured. The driving mechanisms of resilience were identified based on the correlations of vulnerability and response capacity with resilience. Provinces with higher resilience were identified along the eastern coast of China, whereas provinces with lower resilience were located in the western and central parts of the country. The direction and rate of the factors differed and were uncertain, but a quadratic linear relationship between a driving factor and resilience was clearly identified. The results also confirmed that the set pair analysis method is suitable for SES resilience measurement.

8

Preparation and photoluminescence properties of MgNb2O6:Eu3+, Bi3+ red-emitting phosphor

80%

Zhou L. , Huang J. , Mo F.

Materials Science Poland

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2014

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tom Vol. 32, No. 1

88--92

EN

Rare earth Eu3+-doped MgNb2O6 red-emitting phosphor was prepared by solid-state reaction. Structure and photoluminescence properties of the samples were characterized by X-ray diffraction (XRD), scan electron microscopy (SEM) and fluorescence spectrophotometer. Meanwhile, the effect of the co-activator Bi3+ on the PL of the MgNb2O6:Eu3+ phosphor was studied. The results showed that the pure phase of MgNb2O6 could be available after firing at 1200 °C. The Mg1-xNb2O6:Eu3+ x phosphors could be effectively excited by the UV irradiation (273 nm) and emit red light at 615 nm due to the forced electric dipole 5D0 !7 F2 transitions on Eu3+, which indicated that Eu3+ occupied the non-inversion symmetry sites in the MgNb2O6 host lattice. So, the addition of the co-activator Bi3+ not only increased the excitation band of the MgNb2O6:Eu3+ phosphor at about 330 nm, but also strengthened the PL intensity at 615 nm. Therefore, MgNb2O6:Eu3+, Bi3+ might find application to InGaN chip-based white light emitting diodes.

9

Lengthweight relations for 20 fish species from the Pearl River, China

80%

Li Q. , Xu R. , Huang J.

Acta Ichthyologica et Piscatoria

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2013

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tom 43

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nr 1

EN

The length–weight relations (LWR) were estimated for 20 fish species from the Pearl River, South China. A total of 3610 specimens representing 10 families were used to estimate the relation parameters. The b values in the LWR (W = aLb) ranged from 2.068 for Odontamblyopus lacepedii (Temminck et Schlegel, 1845) to 3.423 for Pseudogobius javanicus (Bleeker, 1856). The LWR with high coefficient of determination (r2) is significant for all the species. The r2 value ranged from 0.919 to 0.993. This study presents the first reference on length–weight relations for 7 species and new records of maximum total length for 6 species. The results may be helpful in future fisheries studies in this area.

10

Model of eco-water driving force affecting the evolvement of runoff in the upper Minjiang river basin

80%

Huang J. , Yang W. , Peng L. , Ashraf M. A.

Polish Maritime Research

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2016

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tom 23

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nr Special Issue S1

EN

The amount of eco-water resources reflects the land surface water conservation capability, and the underlying surface condition in the hydrologic cycle. In the upper Minjiang River Basin, the amounts of eco-water resources were retrieved from remotely sensed data during 1992 to 2005. Through regression analysis between the retrieved eco-water data and the climate hydrological data mainly including the temperature, the precipitation, and the runoff in the same period, the model of eco-water driving force affecting the evolvement of runoff was established. The accuracy analysis indicates that the model can well describe the relationship between dry season runoff and its driven factors, the measured data validation proves that the model has high precision and good practicability. The eco-water remote sensing inversion provides a valid method to quantify the land surface water conservation capability, and suggests an interesting approach for the driving function quantitative researches of underlying surface factor in the hydrologic cycle

11

Flex Fatigue Behavior Of Plastic Optical Fibers With Low Bending Cycles

80%

Huang J. , Křemenáková D. , Militký J.

Autex Research Journal

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2015

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tom Vol. 15, no. 2

112--115

EN

Flex fatigue behaviour of plastic optical fibres (POFs) with the diameters of 0.2 and 0.3 mm under different pretensions is measured with fatigue life curve by flexometer. The fatigue sensitivity coefficient is calculated by the linear fitting curve of normalised stress versus logarithm of bending cycles. The residual modulus is investigated during the flex fatigue processes. The results exhibit the exponential relationship between applied pretension and numbers of bending cycles at break. It is indicated that the flex fatigue of POFs might be sensitive with high swing angle or swing speed. There is an evident loss of modulus for two POFs with pretensions of 4 and 10% of ultimate tensile strength during 10-times bending cycles. The values of residual modulus of two POFs almost keep constant after 10-times bending cycles.

12

A Nonnegative Subspace Approach for Packet Loss Concealment

80%

Huang J. , Zhang Y. , Zhang X. , Xia Z.

Przegląd Elektrotechniczny

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2011

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tom R. 87, nr 10

350-354

EN

This paper presents a nonnegative subspace approach for packet loss concealment problem. The magnitude spectrogram of speech signal is projected onto nonnegative subspace using nonnegative matrix factorization algorithm. Consequently, packet loss concealment problem is transformed to linear interpolation of the projective coefficients in nonnegative subspace. Simulation examples, objective tests show that packet loss concealment in the nonnegative subspace results in improved perceptual quality of speech compared to popular packet loss concealment algorithms.

PL

Zaprezentowano metodę subprzestrzeni dla rozwiązania problemu straty pakietu. Spektrogram amplitudowy sygnału mowy .jest poddawany projekcji do nieujemnej podprzestrzeni przy wykorzystaniu macierzy faktoryzacji. W rezultacie problem staje się możliwy do liniowej interpolacji. Osiągnięto dostrzegalną poprawę jakości przetwarzania sygnału mowy.

13

Simple and efficient genetic transformation of sorghum using immature inflorescences

80%

Chou J. , Huang J. , Huang Y.

Acta Physiologiae Plantarum

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2020

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tom 42

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nr 03

14

The evolution of land plants: a perspective from horizontal gene transfer

80%

Wang Q. , Sun H. , Huang J.

Acta Societatis Botanicorum Poloniae

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2014

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tom 83

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nr 4

EN

Recent studies suggest that horizontal gene transfer (HGT) played a significant role in the evolution of eukaryotic lineages. We here review the mechanisms of HGT in plants and the importance of HGT in land plant evolution. In particular, we discuss the role of HGT in plant colonization of land, phototropic response, C4 photosynthesis, and mitochondrial genome evolution.

15

First record of exotic Amur catfish, Silurus asotus (Actinopterygii: Siluriformes: Siluridae), in the Tibet stretch of the Lancang River, China

80%

Zhu T.-B. , Huang J. , Wang X.-G. , Yang D.-G.

Acta Ichthyologica et Piscatoria

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2018

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tom 48

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nr 2

16

A Data Field method for speech enhancement incorporating Binary Time-Frequency Masking

80%

Huang J. , Zhang Y. , Zhang X. , Zhu T.

Przegląd Elektrotechniczny

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2011

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tom R. 87, nr 7

225-229

EN

A data field approach coupled with binary time-frequency masking is presented for the speech enhancement problem. In this proposed approach, data field method is employed to model the time and frequency dependencies of speech. This formulation has proved to be very helpful in enhancing speech quality by exploiting the correlation of speech both in time and in frequency. The experimental results demonstrate that the proposed algorithm offers improved signal to noise ratio and less spectral distortion.

PL

Do poprawy jakości dźwięku mowy zastosowano metodę pola danych (Data field) połączoną z binarnym maskowanie czasowoczęstotliwościowym. Pozwoliło to znacząco poprawić jakość dźwięku przez wykorzystanie korelacji czasowej i częstotliwościowej. Uzyskano poprawę stosunku sygnału do szumu i zmniejszenie poziomu zniekształceń.

17

A new fossil genus of Siphlonuridae [Insecta: Ephemeroptera] from the Daohugou, Inner Mongolia, China

80%

Huang J. , Liu Y. , Sinitshenkova N. D. , Ren D.

Annales Zoologici

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2007

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tom 57

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nr 2

EN

A new genus and species Multiramificans ovalis gen. and sp. nov. of the family Siphlonuridae s.Z., is described from the Middle Jurassic Jiulongshan Formation of the Daohugou, Inner Mongolia in China. Detailed description and illustration of the specimen along with a brief review of fossil Siphlonuridae s.l. are given. The problems of association between nymphs and adults, and palaoenvironment are briefly discussed.

18

Systematic studies on the hypotrich ciliate, Tachysoma pellionellum (Muller, 1773) Borror, 1972 (Protozoa, Ciliophora) based on integrative analyses: Morphology, morphogenesis and molecular phylogeny

71%

Chen L. , Zhao X. , El-Serehy H. A. , Huang J. , Clamp J. C.

Acta Protozoologica

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2017

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tom 56

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nr 4

19

Water- and N-induced changes in soil C:N:P stoichiometry and its implications for N limitation of a desert steppe species, Glycyrrhiza uralensis

71%

Huang J. , Yu H. , Zhang F. , Li M. , Lin H.

Polish Journal of Ecology

|

2016

|

tom 64

|

nr 2

EN

Changes in precipitation patterns and the deposition of atmospheric nitrogen (N) increase the possibility of altering soil carbon (C):N:phosphorus (P) stoichiometry through their effects on soil C and nutrient dynamics, especially in water- and N-limited ecosystems. We conducted separate 2-year watering and N addition experiments, and examined soil C:N:P stoichiometry, relative growth rate, and leaf N resorption traits of Glycyrrhiza uralensis Fisch in a desert steppe of northwestern China. Our objectives were to determine how soil C:N:P stoichiometry responded to climate change, and its indications for plant growth and N resorption. The results showed that additional water increased N loss and thus decreased N availability, resulting in high N resorption from senescing leaves of G. uralensis. N addition increased N availability, consequently reducing plant N dependence on leaf resorption. High relative growth rates occurred with intermediate N:P and C:N ratios, while high N resorption occurred with a low N:P ratio but a high C:N ratio. Our results indicate that soil C:N:P stoichiometry also could be a good indicator of N limitation for desert steppe species. Altered soil C:N:P stoichiometry affects the N strategy of plants, and will be expected to further influence the structure and function of the desert steppe community in the near future.

20

Water- and N-Induced Changes in Soil C:N:P Stoichiometry and Its Implications for N Limitation of a Desert Steppe Species, Glycyrrhiza uralensis

71%

Huang J. , Yu H. , Zhang F. , Li M. , Lin H.

Polish Journal of Ecology

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2016

|

tom Vol. 64, nr 2

241--254

EN

Changes in precipitation patterns and the deposition of atmospheric nitrogen (N) increase the possibility of altering soil carbon (C):N:phosphorus (P) stoichiometry through their effects on soil C and nutrient dynamics, especially in water- and N-limited ecosystems. We conducted separate 2-year watering and N addition experiments, and examined soil C:N:P stoichiometry, relative growth rate, and leaf N resorption traits of Glycyrrhiza uralensis Fisch in a desert steppe of northwestern China. Our objectives were to determine how soil C:N:P stoichiometry responded to climate change, and its indications for plant growth and N resorption. The results showed that additional water increased N loss and thus decreased N availability, resulting in high N resorption from senescing leaves of G. uralensis. N addition increased N availability, consequently reducing plant N dependence on leaf resorption. High relative growth rates occurred with intermediate N:P and C:N ratios, while high N resorption occurred with a low N:P ratio but a high C:N ratio. Our results indicate that soil C:N:P stoichiometry also could be a good indicator of N limitation for desert steppe species. Altered soil C:N:P stoichiometry affects the N strategy of plants, and will be expected to further influence the structure and function of the desert steppe community in the near future.