Wyniki wyszukiwania - Biblioteka Nauki

1

Continual mode transformation in a unidirectional compound waveguide

100%

Kong W. , Cai Q. , Lin Z.-L. , Fang Y.-T.

Optica Applicata

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2018

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tom Vol. 48, nr 1

87--94

EN

We propose a new mechanism to achieve mode transformation. In a unidirectional air waveguide we place some metal slabs to form the unidirectional edge loop. Based on the effect of mode interference, the even mode or the odd mode can be completely canceled from their degenerated state through a precise adjustment of slab position, which leads to another mode to be released. By this mechanism, we have achieved continual transformations between even mode and odd mode.

2

Shoot endophytic plant growth-promoting bacteria reduce cadmium toxicity and enhance switchgrass (Panicum virgatum L.) biomass

88%

Begum M. , Afzal S. , Zhao H. , Lou L. , Cai Q.

Acta Physiologiae Plantarum

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2018

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tom 40

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nr 09

3

Constraint Voronoi Grid Generation in 2D Arbitrary Domain by Refinement Algorithm

88%

Li H. , Zeng Y. , Cai Q. , Liu Y. , Du J.

Przegląd Elektrotechniczny

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2013

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tom R. 89, nr 1b

120--123

EN

In this paper, based on studying the traditional constraint Voronoi diagram generation techniques, an optimized trapezium examining strip refinement algorithm for constraint Voronoi grid generation is presented .First, the initial isosceles trapezoid examining strip sets are settled according to the constraint condition, then by introducing several control factors to subdivide the examining strip to realize the speedy generation of constraint Voronoi grids. Experimental results show the proposed algorithm can get satisfied results even in the complex domain including internal boundary constraints, pencil of lines constraints and irregular areas.

PL

W opracowaniu, w celu wytworzenia siatek Voronoi z ograniczeniami, na podstawie badań tradycyjnej techniki wytwarzania diagramem Voronoi, przedstawiono algorytm rafinacyjny tworzenia trapezowej wstęgi badań. Wstępnie ustalono równomierne trapezowe wstęgi badań zgodnie z warunkami ograniczeń. Następnie, aby przyspieszyć tworzenie siatek, podzielono badane wstęgi przez wprowadzenie kilku współczynników kontroli. Wyniki badań pokazują, że proponowany algorytm daje satysfakcjonujące wyniki w złożonych obszarach, włącznie z ograniczeniami wewnętrznymi granicami i wiązkami linii oraz w przypadku nieregularnych pól.

4

Distribution characteristics, pollution assessment, and source identification of heavy metals in sediments of wetland lakes

88%

Chen L. , Cai Q. , Xu S. , Liu X. , Chen S.

Polish Journal of Environmental Studies

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2015

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tom 24

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nr 4

EN

The aims of current study are to asses the levels of heavy metals (Cr, Cu, Ni, Fe, Zn, Co, Pb, and Cd) in sediments of lakes in Yangtze wetland and discuss the relationships between the sources and human activities. A total of 54 samples covering seven lakes along the Yangtze route in Anqing were selected. The concentrations of metals in lake sediments were (mg-kg⁻¹): Cr, 4.08~12.58; Cu, 22.40~74.36; Ni, 29.89~142.17; Fe, 22899.20~50956.40; Zn, 102.31~242.04; Co, 8.35~26.89; Pb, 23.38~88.77; and Cd, 0.29~2.95. The situation of Xizi Lake was the most serious among the seven lakes investigated. Geoaccumulation index (Igeo) analysis showed that overall risk of heavy metals in sediments was approximately in the order: Cd > Pb = Zn = Cu = Ni > Fe > Co = Cr. The results of principal component analysis (PCA) suggested the main sources of Cd, Cu, Zn, Ni, and Pb on PC 1 were fuel combustion, metal smelting, industrial manufacturing, and other human activities, while Fe on PC 2 originated fromrock weathering and other geochemical processes.

5

Continuous surface miner (CSM) and its potential application to surface coal mining in China

75%

Zhang R. , Wang C. , Ren T. , Lin H. , Wang Z. , Cai Q.

Prace Naukowe Instytutu Górnictwa Politechniki Wrocławskiej. Konferencje

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1998

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tom Vol. 82, nr 21

387-399

EN

The selection of open pit equipment is an important aspect in modern surface mining. This paper analyses the conventional surface mining technologies using rope shovels or bucket wheel excavators. Although these technologies are commonly used world-wide, they have limitations as regards maintaining a high efficiency and achieving the best selective mining of complex coal seams in mines. On the other hand, the Continuous Surface Miner (CSM), as a new type of mining equipment, has a strong cutting force and a powerful capability in selective mining with a high degree of accuracy. As the technology develops, it is likely that CSM will become an ideal surface mining machine for hard material and selective mining. This paper examines the development and classification of CMS. The application of CSM to Chinese surface mining is discussed on the basis of selected case studies. The results show that undoubtedly there are splendid prospects for the CMS technology in surface coal mines in China.

PL

Wybór urządzeń urabiających stanowi ważny aspekt nowoczesnego górnictwa odkrywkowego. Referat omawia konwencjonalne technologie górnictwa odkrywkowego wykorzystującego koparki linowe i wielonaczyniowe koparki kołowe. Chociaż te technologie stosowane są na całym świecie, mają one swoje ograniczenia pod względem utrzymania wysokiej wydajności i osiągnięcia najlepszej selektywnej eksploatacji złożonych pokładów węgla w kopalniach. Z drugiej strony kombajn do ciągłego urabiania odkrywkowego (CSM), jako nowy rodzaj urządzenia, charakteryzuje się dużą siłą wrębiania i olbrzymimi możliwościami selektywnego urabiania z wysokim stopniem dokładności. Wraz z rozwojem tej technologii, zwiększa się prawdopodobieństwo, że CSM stanie się idealną maszyną do urabiania odkrywkowego w przypadku twardego materiału i selektywnej eksploatacji górniczej. Referat przedstawia rozwój i klasyfikację kombajnów do ciągłego urabiania odkrywkowego. Zastosowanie tych kombajnów w chińskich kopalniach odkrywkowych prezentowane jest na wybranych przykładach. Wyniki wskazują, że technologia CSM niewątpliwie ma przed sobą przyszłość w górnictwie odkrywkowym w Chinach.

6

Paclobutrazol and plant-growth promoting bacterial endophyte Pantoea sp. enhance copper tolerance of guinea grass (Panicum maximum) in hydroponic culture

75%

Huo W. , Zhuang C. , Cao Y. , Pu M. , Yao H. , Lou L. , Cai Q.

Acta Physiologiae Plantarum

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2012

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tom 34

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nr 1

EN

As most gramineous plants, guinea grass (Panicum maximum) comprise cellulosic biomass, which may be used as a feedstock for bioenergy. In order to develop such potential energy plants on copper-polluted lands, the hydroponic experiments with Cu, Paclobutrazol (PP333, a kind of antigibberellin) and plant growth-promoting bacterial endophyte (PGPB) treatments were carried out in a greenhouse. The seedlings of two cultivars of guinea grass, GG1 (P. maximum var. Natsukomaki) and GG2 (P. maximum var. Natsukaze) in 3 weeks old were treated, respectively, with different Cu treatments [0(CK), 100, 200, 300, 400, 500 µM l⁻¹ Cu] for estimating Cu toxicity. The results showed that elevated Cu restrained plant growth and reduced biomass. According to the EC50 value [the Cu concentration when the relative gain in fresh weight ratio was 50% of control] of two tested cultivars, the concentration of Cu for further experiments was decided as 300 µM l⁻¹. Both pretreatments of PP333 (200, 400, 600 mg l⁻¹) and PGPB (Pantoea sp.) significantly alleviated the negative affect caused by stress of 300 µM l⁻¹ Cu. The pretreatment of 400 mg l⁻¹ PP333 promoted both two cultivars in biomass, compared to 300 µM l⁻¹ Cu treat. The inoculation of Pantoea sp. Jp3-3 increased shoot dry weight, compared to Cu treat. The results suggested that the main reason for both PP333 and Pantoea sp. Jp3-3 enhanced Cu tolerance in guinea grass was that their pretreatments significantly decreased Cu absorption and accumulation under excessive Cu stress. The present study has provided a new insight into the exploitation of energy plant in heavy metal polluted condition by the way of plant growth regulation for increasing heavy metal tolerance.