Wyniki wyszukiwania - Biblioteka Nauki

1

Jeszcze jedna funkcja mikrobiologicznych ogniw paliwowych w oczyszczaniu ścieków: wytwarzanie wody o wysokiej jakości

100%

He Z.

Chemik

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2012

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tom Vol. 66, nr 1

3-10

PL

Zrównoważona technologia oczyszczania ścieków powinna skutecznie obniżać stężenie zanieczyszczeń, odzyskiwać energię i minimalizować zrzut cieczy. Potencjalnym kandydatem na taką technologię jest mikrobiologiczne ogniwo paliwowe (MFC - ang. Microbial Fuel Cell), które może wytwarzać bioelektryczność bezpośrednio z oczyszczania ścieków. Jednak oczyszczony ściek z MFC nie jest ponownie wykorzystywany z powodu niezadowalającej jakości wody. Do wytwarzania wody o wysokiej jakości za pomocą MFC zaproponowaliśmy i zbadaliśmy dwie metody wykorzystujące zintegrowane technologie membranowe. W szczególności osmotyczne MFC, w których wykorzystuje się osmozę wymuszoną (ang. forward osmosis) i MFC, okazały się wykonalne w badaniach na skalę laboratoryjną. Nowa funkcja polegająca na wytwarzaniu wody o wysokiej jakości, choć nadal stanowiąca duże wyzwanie, czyni z MFC obiecującą metodę ekologicznie zrównoważonego oczyszczania ścieków.

EN

A sustainable wastewater treatment technology should effectively reduce contaminant concentration, recovery energy contents and minimize liquid discharge. A potential candidate for such a technology is a microbial fuel cell (MFC) that can produce bioelectricity directly from wastewater treatment. However, the treated effluent from MFCs is not reused because of unsatisfied water quality. To produce high-quality water using MFCs, we proposed and studied two approaches with integrated membrane technologies. Especially, the osmotic MFCs that take advantage of both forward osmosis and MFCs have been proven feasible with bench-scale studies. The new function of producing high-quality water, although still very challengeable, will make MFCs a promising approach for sustainable wastewater treatment.

2

Solving point-feature labeling placement problem by parallel Hopfield neural network on GPU graphics card

63%

He Z. , Harada K.

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tom Vol. 15, No. 1

99-120

EN

This paper discusses the application of parallel Hopfield neural networks in solving the point-feature labeling placement (PFLP) problem by using programmable graphics hardware found in a commodity PC. In this paper, we focus on two aspects. The first aspect concerns mapping the PFLP onto parallel Hopfield neural network. The second aspect is the detailed method of implementing the parallel Hopfield neural network on graphics hardware. We demonstrate the effectiveness of implementing the parallel Hopfield network by solving the PFLP problem. Moreover, our proposal makes use of the advantages of the parallel Hopfield network on low-cost platforms.

3

The influence of ship rolling motion on take-off aerodynamic characteristics of aircraft

51%

He Z. , Sun X. , Gu X.

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nr Special Issue S2

EN

Ship motion is an important factor affecting on the safety of ski-jump take-off. The simplified frigate ship SFS1 was numerically simulated, and the results were compared with the experimental data, the feasibility of the calculation method was verified; Meshless method and WALE turbulence model were used to simulate the process of aircraft skijump take-off, aerodynamic characteristics under different rolling conditions during the aircraft ski-jump take-off process were presented. The results showed that: the influence of ship rolling motion on lift coefficient, drag coefficient and pitching moment was small, side force and rolling moment were greatly affected by rolling motion; the region of downwash with the maximum speed was about 10 m from the bow; the safety of ski-jump take-off was greatly affected when aircraft was close to the bow within 20 m

4

The influence of ship rolling motion on take-off aerodynamic characteristics of aircraft

51%

He Z. , Sun X. , Gu X.

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2018

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tom S 2

23--29

EN

Ship motion is an important factor affecting on the safety of ski-jump take-off. The simplified frigate ship SFS1 was numerically simulated, and the results were compared with the experimental data, the feasibility of the calculation method was verified; Meshless method and WALE turbulence model were used to simulate the process of aircraft skijump take-off, aerodynamic characteristics under different rolling conditions during the aircraft ski-jump take-off process were presented. The results showed that: the influence of ship rolling motion on lift coefficient, drag coefficient and pitching moment was small, side force and rolling moment were greatly affected by rolling motion; the region of downwash with the maximum speed was about 10 m from the bow; the safety of ski-jump take-off was greatly affected when aircraft was close to the bow within 20 m.

5

Plant regeneration of the arsenic hyperaccumulator Pteris vittata L. from spores and identification of its tolerance and accumulation of arsenic and copper

51%

Zheng Y. , Xu W. , He Z. , Ma M.

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nr 2

EN

An in vitro plant regeneration system was established from the spores of Pteris vittata and identification of its tolerance, and accumulation of gametophytes and callous, to arsenic (As) and copper (Cu) was investigated. The highest frequency (100%) of callus formation was achieved from gametophyte explants treated with 0.5 mg l⁻¹ 6-benzylaminopurine (6-BA) + 0.5 mg l⁻¹ gibberellin acid (GA). Furthermore, sporophytes were differentiated from the callus tissue derived from gametophyte explants on MS medium supplemented with 0.5 mg l⁻¹ 6-BA, 0.5–1.0 mg l⁻¹ GA and additional 300 mg l⁻¹ lactalbumin hydrolysate (LH) for 4 weeks. The optimum combination of ½ MS + 1.0 mg l⁻¹ GA + 0.5 mg l⁻¹ 6-BA + 300 mg l⁻¹ LH promoted sporophyte formation on 75 ± 10% of the callus. Every callus derived from gametophyte explants could achieve 3–4 sporophytes. The in vitro growth of gametophyte and callus was accelerated in the medium containing Na3AsO4 lower than 0.5 mM, but this growth was inhibited with 2 mM Na3AsO4. And with the increase of Na3AsO4 in the culture medium from 0 to 2 mM, the As accumulation in gametophytes and callus increased and achieved a level of 763.3 and 315.4 mg kg⁻¹, respectively. Gametophytes and calluses transplanted to culture medium, supplemented with different concentrations of CuSO4, are similar to those in Na3AsO4, and the Cu accumulation in gametophytes could achieve 7,940 mg kg–1 when gametophytes were subcultured in medium containing 3 mM CuSO4. These results suggested that the high efficiency propagation system could be a useful and rapid means to identify other heavy metal tolerance and accumulation. Further, the regeneration ability of callus made it possible for genetic transformation of this fern.

6

Different Patterns of Changes in Foliar Carbon Isotope Composition Along Altitude

45%

He Z. , Zhan S. , Wang W. , Hu L. , Wu S.

Polish Journal of Ecology

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2017

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tom Vol. 65, nr 2

227--235

EN

Three types of alpine plant species, Carex montis-everestii, Quercus aquifolioides and Stipa capillacea, along an altitudinal gradient of 3005-5025 m on the Tibetan Plateau, were chosen to test the generality of the hypothesis that foliar carbon isotope composition (δ13C) of C3 plants increases significantly with altitude and to determine climate drivers shaping its altitudinal pattern. Temperature and relative humidity showed significantly negative correlations with altitude; however, precipitation and soil water potential remained unchanged with altitude. Foliar δ13C of C. montis-everestii, Q. aquifolioides, S. capillacea alone or combined together did not significantly increase with altitude, which does not support the leading hypothesis of increased foliar δ13C with altitude. There was no difference in foliar δ13C among all three species. Multi-factor correlation analyses showed that temperature, precipitation and relative humidity alone did not affect foliar δ13C of C. montis-everestii and S. capillacea, but conferred significant effects on foliar δ13C of Q. aquifolioides.

7

Synthesis of HMX via Nitrolysis of DPT Catalyzed by Acidic Ionic Liquids

45%

He Z. , Luo J. , Lu C. , Xu R. , Li J.

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tom Vol. 8, nr 2

83-91

EN

The direct nitrolysis of DPT to synthesize HMX with ionic liquids (ILs) as catalysts was investigated. The results showed that [Et3NH] HSO4 was the best catalyst among 18 ILs used and the yield of HMX was up to 61% against 45% without IL. The ILs could be effciently recovered by simple distillation and extraction after reaction without any apparent loss of catalytic activity even after 10 times recycling.

8

Survival potential of Phytophthora infestans sporangia in relation to environmental factors and late blight occurrence

45%

Olanya O. M. , Anwar M. , He Z. , Larkin R. P. , Honeycutt C. W.

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nr 1

EN

Potato is an important crop globally and late blight (Phytophthora infestans) often results in severe crop loss. The cost for late blight control can be in excess of $210 million in the United States. We utilised a non-parametric density distribution analysis of local temperature (T) and relative humidity (RH), from 2005 to 2009, to assess and validate sporangia survival potential using survival model and late blight risks during the potato cropping season at Presque Isle, in the northern part of the state of Maine, USA. Modelbased analyses showed that ambient temperatures of 3−30°C and RH values of 45−100% were conducive for sporangia survival. Disease outbreaks and risk periods coincided with a high sporangia survival probability (15−35%). Due to the omission of solar radiation (SR) in the computation of survival potential in previous research, we applied a Cox proportional model to estimate the probability of sporangia survival [i.e. hazard at a specific time H(t)] as a function of baseline hazard (H0) and the influencing parameters. The model is: H(t) = H0(t) × exp(0.067ET + 0.138T + 0.083RH + 0.001SR) where ET is exposure time. The survival model indicated that RH (β = 0.083) and T (β = 0.138) were significant (p < 0.05) factors in sporangia survival in comparison to SR (β = 0.001). The hazard ratio, indicative of sporangia survival risk, varied with the predictors. For the unit increase of T, sporangia survival hazard increased by 1.148 times. The Cox model and sporangia hazard probabilities can be used for short-term disease forecasts based on the risk period most conducive for pathogen survival and targeted fungicide applications for optimum late blight management.

9

New Mixed Weibull Probability Distribution Model for Reliability Evaluation of Paper-oil Insulation

45%

He Z. , Wang Y. , Li J. , Gong S. , Grzybowski S.

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tom R. 89, nr 1a

202--206

EN

This paper presents a new mixed Weibull probability distribution model for reliability evaluation of the paper-oil insulation. The breakdown voltage, furfural, and six other characteristic parameters were chosen to reflect the reliability of paper-oil insulation. The new mixed Weibull probability distribution model was established to evaluate the reliability of the paper-oil insulation. Reliability predictions of the paper-oil insulation at different times verified the feasibility of the new mixed Weibull probability distribution model.

PL

W artykule przedstawiono metodę budowy modelu rozkładu prawdopodobieństwa Weibulla, w wykorzystaniu do oceny niezawodności izolacji papierowo-olejowej. Wykorzystywanych jest osiem parametrów dotyczących niezawodności. Wykonane przewidywanie niezawodności dla różnych odległości czasowych potwierdzają skuteczność metody.

10

Electrostatic Hazards Assessment of Nitramine Explosives: Resistivity, Charge Accumulation and Discharge Sensitivity

38%

Peng Q. , Cao W. , Zhou W. , He Z. , Jiang W. , Chen W.

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2016

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tom Vol. 13, no. 3

755--769

EN

The electrostatic hazards of nitramine explosives (RDX, HMX) were assessed in this paper. The resistivities of different particle-size RDX and HMX were tested by a device designed and manufactured according to the standard ISO/IEC 80079-20-2:2016. This work shows that the resistivities of uncompacted RDX and HMX increase as the particle size decreases. Charging characteristics test experiments were also carried out using a so-called sieve method. Using this method, the influence of aperture size on charge accumulation of RDX was studied, and the characteristics of electrostatic accumulation of different particle-size RDX and HMX sieved with 50 mesh standard sieve were compared. The results show that the absolute value of the charge accumulation increases as the mesh number increases (i.e. the aperture size decreases), and increases as the particle size is decreased, indicating that nano-sized RDX and nano-sized HMX accumulate static electricity more easily than conventional micron-sized ones. Finally, the electrostatic discharge (ESD) sensitivity of nano-sized RDX and nano-sized HMX was investigated. Nano-sized nitramine explosives were found to have a higher ESD sensitivity than micron-sized ones.

11

A velocity measurement method based on scaling parameter estimation of chaotic system

38%

Liu L. , Hu J. , He Z. , Han C. , Li H. , Li J.

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tom Vol. 18, nr 2

275-281

EN

In this paper, we propose a new method of measuring the target velocity by estimating the scaling parameter of a chaos-generating system. First, we derive the relation between the target velocity and the scaling parameter of the chaos-generating system. Then a new method for scaling parameter estimation of the chaotic system is proposed by exploiting the chaotic synchronization property. Finally, numerical simulations show the effectiveness of the proposed method in target velocity measurement.

12

Effects of saline-alkaline stress on early growth strategy and colonization success of Flaveria bidentis ( L.) Kuntze (Asteraceae ) - a new exotic plant in Northern China

38%

Chai M. , Shi F. , He K. S. , Li R. , Cao D. , He Z.

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nr 3

EN

Flaveria bidentis, an annual grass native to South America, has invaded into many countries all over the world, including South Africa and Egypt in Africa, Britain and France in Europe, Japan in Asia, and Australia. In China, this plant species has been widely distributed in Hebei province since 2001 of its first discovery in Tianjin. In salinized soil of northern China, F. bidentis has formed mono dominant communities owing to its opportunistic characteristics. In this study, we investigated germination rate, germination energy, germination index and vigor index in response to different saline-alkaline stresses. Lengths of seedling, hypocotyl, and radicle were also examined. During germination process, germination rate, germination energy, germination index, and vigor index decreased due to higher salinity and alkalinity (pH). Hypocotyl elongation was stimulated at low salinity and alkalinity, but decreased with increasing salinity and alkalinity. The lengths of radicle and seedling were inhibited sharply with increasing salinity and alkalinity. These results suggest that a reciprocal enhancement between salt stress and alkaline stress was a characteristic feature during seed germination of F. bidentis. Ungerminated seeds resumed to germinate after transferred to distilled water, indicating that seeds remained viable during their exposure to saline-alkaline stresses. Stepwise regression analysis indicated that the effects of salinity, alkalinity (pH), and buffer capacity on seed germination and seedling growth were significantly different in magnitude. Salinity and alkalinity (pH) were the dominant factors in seed germination and seedling growth of F. bidentis respectively. burther, the results of this study suggest that F. bidentis has developed excellent adaptative strategy in its early stage of life cycle which partially explains its current invasion success in northern China.

13

Enhanced purification of eutrophic water by microbe-inoculated stereo floating beds

32%

Zhao F. , Zhang S. , Ding Z. , Aziz R. , Rafiq M. T. , Li H. , He Z. , Stoffella P. J. , Yang X.

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nr 3

EN

This study was conducted to investigate the feasibility of using floating beds of tall fescue plants (Festuca arundinacea) inoculated with denitrifying polyphosphate accumulating microorganisms (DPAOs). In the presences of DPAOs, tall fescue showed greater removal of NH₄⁺-N, NO₃⁻-N, total N (TN), and orthophosphate (ortho-P) after a 20-day treatment. The average removal rates were 86.32%, 93.60%, 90.12%, 72.09%, and 84.29%, respectively, for NH₄⁺-N, NO₃⁻-N, TN, total P (TP), and ortho-P. Tall fescue plants grew well on the floating beds and the average growth rate was approximately 5.4 g DM m⁻²·d⁻¹. Tall fescue plants, being rich in crude potein, Ca, Mg, Fe, and Mn, can meet the daily feed requirements of livestock and poultry and were found safe to be used as animal feed.

14

First report of Theileria infection of bactrian camels (Camelus bactrianus) in Xinjiang, China

26%

Li Y. , Li X. , Liu J. , Wang J. , Jia D. , Liu A. , He Z. , Guan G. , Liu Z. , Liu G. , Luo J. , Yin H.

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nr 4