Wyniki wyszukiwania - Biblioteka Nauki

1

Research on product value of wheel diameter and rotational speed — A new design parameter for micro radial turbines

100%

Fu L. , Li G.

Archives of Civil and Mechanical Engineering

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2017

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tom Vol. 17, no. 2

231--239

EN

The physical realizability is the primarily consideration in micro radial turbine design. The determination of realizability mainly depends on the physical size (wheel diameter) and operation condition (rotational speed). In the past design, the product value of wheel diameter (D) and rotational speed (N) was taken as design result, but this value would lead repeating works because it may not appropriate for the realizability of micro radial turbine. This paper takes DN value as a design parameter to help the micro radial turbine design directly. The analysis of matching relationship between stage velocity ratio and degree of reaction was studied firstly. The influence of matching effects was investigated secondly. Then the DN value was presented and the theoretical research for optimal value selection was conducted thirdly. Compared with the other design parameters, the DN value can reflect the effect of efficiency, wheel size, rotational speed and design working condition directly and the effect of wheel material, structure style, shafting and bearings type directly. So the DN value is a highly concentrated and useful parameter for micro radial turbines. Some aerodynamic and structure parameters of micro radial turbine will be facilitated and designed by using the method of this paper.

2

Optimization of an aluminum alloy anti-collision side beam hot stamping process using a multi-objective genetic algorithm

80%

Zhou J. , Wang B. , Lin J. , Fu L.

Archives of Civil and Mechanical Engineering

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2013

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tom Vol. 13, no. 3

401--411

EN

The process parameters of aluminum alloy hot stamping are essential for product forming quality. In the case of an anti-collision side beam inside car doors, the finite-element model of aluminum alloy hot stamping is set up, and the forming quality is investigated under an ordinary process condition. The blank hold force (BHF) has a significant impact on the forming quality in hot stamping. Using the Latin hypercube method to sample the simulation data points and the finite-element (FE) model to calculate the forming quality indices of the data points according to the response value of the indices, the quadratic response surfaces between the process parameter inputs and the forming quality indices are initialized. Using the multi-objective genetic algorithm NSGA-II (non-dominated sorting genetic algorithm) to optimize the responses of the process parameters, the Pareto solutions corresponding to combinations of the blank hold force and stamping speed are obtained. Finally, based on the optimal process parameters, stamping tests are carried out. Compared with the results of the stamping trial and numerical simulation, it is demonstrated that the finite-element model can predict forming defects and be consistent with the actual condition and that the optimization procedure proposed in the paper is feasible.

3

OsCPK20 positively regulates Arabidopsis resistance against Pseudomonas syringae pv. tomato and rice resistance against Magnaporthe grisea

80%

Fu L. , Yu X. , An C.

Acta Physiologiae Plantarum

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2014

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tom 36

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nr 02

EN

Calcium-dependent protein kinases are important decoders of calcium signals in plants, which are involved in plant immunity. We report isolation and functional characterization of a pathogen-responsive OsCPK20 gene in rice. The expression of OsCPK20 in rice was significantly induced following treatment with a Magnaporthe grisea elicitor. Overexpression of constitutively active OsCPK20 in Arabidopsis enhanced the resistance to infection with Pseudomonas syringae pv. tomato, associated with elevated expression of both SAand JA-related defense genes. Similarly, transgenic rice plants containing constitutively active OsCPK20 exhibited enhanced resistance to blast fungus M. grisea. The enhanced resistance in the transgenic Arabidopsis and rice was associated with activated expression of both SA- and JA-related defense genes. We also found that OsCPK20 was significantly induced by drought stress, indicating that OsCPK20 might be involved in plant response to drought stress. Taken together, our results indicate that rice OsCPK20 positively regulates Arabidopsis resistance against Pseudomonas syringae pv. tomato and rice resistance against M. grisea, and that it may enhance disease resistance by activating both SA- and JA-dependent defense responses.

4

Multiple Frequency Ultrasounds Assisted Oil Sands Separation Technology

80%

Liao K. , Ge J. , Zhang G. , Fu L.

Archives of Acoustics

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2017

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tom Vol. 42, No. 4

767--773

EN

Ultrasound has a wide range of applications in oil sands separation industry due to its green and nopolluting characteristics. The combined ultrasounds technology has been widely used in many industries by virtue of the synergistic effect of cavitation effect; meanwhile, dual-frequency ultrasounds have been reported being used in lotion oil sands technology. Based on this idea, this study focuses on the application of multiple frequency ultrasounds in oil sands separation, and a comparative study has been conducted between the combined ultrasounds systems with the difference in the number of the ultrasound. The results show that the oil production rate of the samples treated by the lotion of sodium dodecyl benzene sulfonate (SDBS) and assisted by multiple frequency ultrasounds (96%) is significantly higher than that of the single frequency ultrasound (76%); the bigger the number of the ultrasound participating in the combination is, the higher the oil production rate of the oil sands is; the lower the frequency of the ultrasounds employed in the combined system is, the higher the oil production rate is. The optimum treating conditions for tri-frequency ultrasounds assisted technology are as follow: the treating time is 10-15 min, the treating temperature is 20-30°C, the concentration of surfactant in the lotion is 1.5 g/l, and the mass ratio of the lotion to oil sands is 1.8. In short, the use of multiple frequency ultrasounds can improve the oil production rate of oil sands, reduce the energy consumption during the separation process, and reduce the environmental contamination; therefore, multiple frequency ultrasounds assisted oil sands separation technology is a promising technology for oil sands resources exploitation with high efficiency.

5

Aging and the time course of inhibition of return in a static environment

80%

Bao Y. , Zhou J. , Fu L.

Acta Neurobiologiae Experimentalis

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2004

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tom 64

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nr 3

6

Rapid and highly efficient callus induction and plant regeneration in the starch-rich duckweed strains of Landoltia punctata

70%

Huang M. , Fu L. , Sun X. , Di R. , Zhang J.

Acta Physiologiae Plantarum

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2016

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tom 38

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nr 05

7

Water entry in jujube fruit and its relationship with cracking

61%

Li N. , Fu L. , Song Y. , Li J. , Xue X. , Li S. , Li L.

Acta Physiologiae Plantarum

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2019

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tom 41

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nr 09

EN

Cracking is caused by physiological stress during the development of jujube fruit, and this causes considerable economic losses to fruit producers. The aim of this study was to clarify the mechanisms of water entry into the fruit and the events that lead to cracking. Differences in water absorption by fruit stalks and surfaces were observed in a cracking-sensitive variety (Ziziphus jujuba Mill. ‘Hupingzao’) and a cracking-resistant variety (Ziziphus jujuba Mill. ‘Yuanlingzao’). The response of the fruit surface to water absorption was studied, and the relationship between stomatal characteristics and cracking was analyzed. The cracking rate of ‘Hupingzao’ was higher during the coloring period. The relative amount of water absorbed through the fruit stalk of ‘Yuanlingzao’ after 10 h was 1.22 times higher than that of ‘Hupingzao’ during the coloring period. The rate of water absorption through the fruit surface of ‘Hupingzao’ was higher than that of ‘Yuanlingzao’ during the coloring period (3.73 and 3.04, respectively). Water was transported by the vascular bundle after entering the fruit through the fruit stalk, but was mainly distributed around the stomata of the epidermis and near-surface cells following entry through the fruit surface. After water was absorbed by the fruit surface, surface and stomatal cracks in ‘Hupingzao’ were apparent, and the degree of cracking of the stomata worsened with increasing water absorption time. The surface of ‘Yuanlingzao’ appeared cracked with increasing immersion time, but stomatal changes were not obvious. The stomatal size and aperture in the cracking-resistant variety of jujube fruit were lower than those in the cracking-sensitive variety. Stomatal size was positively correlated with the rate of fruit cracking. Water absorption through the surface was the main factor that induced fruit cracking. Stomatal characteristics, as well as the increased and deepened fruit surface microcracks caused by stomatal water absorption, were the primary factors related to cracking.

8

Standing seats for high-capacity trains

61%

O’Neill C. , Wake M. , Fu L. , Samuel-Horsfall C. , Kor E. , Vieira J. , Dong -Fang Y.

Transport Problems

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2014

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tom T. 9, z. spec.

89--100

EN

This paper details the design and potential implementation of standing seats in a commuter rail vehicle for the purposes of maximising capacity and revenue. The vehicle interior design is suited to the “Commuter Class” – a subset of travellers who travel primarily within the commuter belt and frequently utilise rail networks on a daily basis but require little additional space for luggage or peripherals. The concept delivers capacity increases in excess of 50% whilst still offering passengers a greater degree of personal space when compared with standing in aisles or gangways. The impact on vehicle stability and supporting intelligent systems are also discussed, delivering a unique design tailored specifically to meet the needs of the commuter class passenger.

PL

Artykuł opisuje szczegółowo projekt stojących miejsc siedzących i potencjał ich wprowadzenia, w podmiejskim pojeździe kolejowym, w celu maksymalizacji wydajności i dochodów z przejazdu. Wnętrze takiego pojazdu jest dostosowane do ludzi przemieszczających się głównie w okręgu miejskim, podróżujących codziennie i wymagających odrobinę miejsca dla mniejszych bagaży czy urządzeń peryferyjnych. Koncepcja zapewnia wzrost pojemności o ponad 50%, dodatkowo oferując pasażerom jeszcze większy stopień osobistej przestrzeni w porównaniu ze staniem w korytarzach lub przejściach. Wpływ na stabilność pojazdu i wspieranie inteligentnych systemów są także uwzględnione, dostarczając tym samym unikalną konstrukcję dostosowaną specjalnie do potrzeb pasażera pociągów podmiejskich.

9

Schemes Set for Protecting Parallel Generators with Different Capacity in the Integrated Power System

61%

Ye Z. , Wang G. , Hu L. , Fang M. , Fu L. , Fan X. , Ma F.

Przegląd Elektrotechniczny

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2012

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tom R. 88, nr 10a

162-165

EN

The output of power stations varies widely with the diverse operating modes in which the vessels integrated power system (IPS) works. Taking two parallel generators with different capacity for example, there are four possible protection schemes set for both the bus breaker and the main breakers of generators. The results show that the setting value used in each of four cases cannot offer appropriate protection for the normal operation of the system. For this reason, a solution is proposed, that is, the time-current principle in combination with the detection of voltage sag.

PL

Przy dwóch połączonych równolegle generatorach o różnej pojemności trzeba używać cztery układy zabezpieczające dla dwóch łączników szynowych i głównych łączników generatorów. W artykule zaproponowano nowe rozwiązanie układu zabezpieczającego bazujące na analizie czas-prąd i detekcji zapadów napięcia. (Układy zabezpieczenia generatorów równoległych o różnej pojemności dołączonych do zintegrowanego systemu energetycznego)

10

Effect of root cortical aerenchyma of hybrid corn (Zea mays L.) on maize resilience after rehydration under extreme drought

51%

Wang Z. , Mou C. , Chen H. , Chen J. , Wang P. , Yin M. , Fu L. , Li Z. , Su F. , Hong L.

Polish Journal of Environmental Studies

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2019

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tom 28

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nr 3

EN

Variation laws of growth conditions and root cortical aerenchyma (RCA) of 15 common maize hybrids (Zea mays L.) in Yunnan Province under simulated rare extreme drought and rehydration conditions were tested in this paper. The relationship between functions of root tissues in extreme drought process and resilience after rehydration was discussed. Results demonstrated: 1) in middle drought period, RCA area is closely related with drought resistance of varieties and 2) Varieties with large or small RCA area under drought stress have poor resilience after rehydration, while varieties with middle RCA area present strong resilience. We concluded that RCA area formed under drought stress will significantly influence recovery of root functions during rehydration. Large RCA area brings corn strong drought resistance, but it goes against recovery of root functions after rehydration. Small RCA area causes poor drought resistance of corn plants, which will induce serious damage to plants and make it difficult to recover root functions after rehydration. Moderate RCA area helps corn variety to develop certain drought resistance and recover functions of root tissues through further formation of RCA area by parenchymal cells in root cortical tissues. RCA area formed in corn roots can affect drought resistance significantly, and increased RCA area in root system after rehydration can enhance resilience of corn plants.