Wyniki wyszukiwania - Biblioteka Nauki

1

Anatomy and relationships of the fuxianhuiid euarthropod Guangweicaris from the early Cambrian Guanshan Biota in Kunming, Yunnan, Southwest China revisited

100%

Wu Y. , Liu J.

Acta Palaeontologica Polonica

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2019

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tom 64

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nr 3

EN

The Guanshan Biota (Cambrian Series 2, Stage 4) is a typical Burgess Shale-type biota, and is one of the most significant Cambrian Konservat-Lagerstätten from China, in addition to the well-known Chengjiang and Kaili biotas. Guangweicaris is a relatively common arthropod from the Guanshan Biota. Based on new specimens from the Longbaoshan and Xinglongcun sections of the Wulongqing Formation in Kunming, we herein report novel features of Guangweicaris spinatus, such as the eye-bearing anterior sclerite that is associated with the head shield, as well as revised details of the trunk, including the ventral appendages. A detailed comparison of Guangweicaris, Fuxianhuia and Shankouia suggests a close affinity between Guangweicaris and Fuxianhuia, which improves our understanding of the evolution of early Cambrian euarthropods.

2

Photosynthetic response of three climber plant species to osmotic stress induced by polyethylene glycol (PEG) 6000

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Xing D. , Wu Y.

Acta Physiologiae Plantarum

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2012

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tom 34

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nr 5

EN

We examined the photosynthesis response to osmotic stress in three climber plant species, Pharbitis nil (Linn.) Choisy, Lonicera japonica Thunb, and Parthenocissus tricuspidata (Sieb.et Zucc.) Planch. All climber plants were exposed to osmotic stress induced by polyethylene glycol (PEG) 6000 at 4 levels (slight, moderate, severe osmotic and the control) for 30 days. Photosynthesis response was determined by measuring leaf photosynthesis, chlorophyll fluorescence, carbonic anhydrase activity and stable carbon isotope ratios. P. nil maintained high photosynthetic activity under long-term moderate osmotic stress due to both stable photosystem II photochemical efficiency and high carbonic anhydrase activity. L. japonica maintained high photosynthetic activity under longterm moderate stress due to high carbonic anhydrase activity rather than photosystem II photochemical efficiency. P. tricuspidata tolerated only short-term moderate osmotic stress and long-term slight osmotic stress because its response was mainly stomatal limitation, with the lowest photosynthetic activity and hardly any carbonic anhydrase activity. Carbonic anhydrase activity was inversely correlated with stable carbon isotope ratios. The regulation by carbonic anhydrase was probably the reason for P. nil and L. japonica to tolerate long-term moderate osmotic stress. The selection on the species should consider the differential adaptation mechanism to osmotic stress during the development of drought-resistant plants.

3

Effect of bicarbonate stress on carbonic anhydrase gene expressions from Orychophragmus violaceus and Brassica juncea seedlings

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Hang H. , Wu Y.

Polish Journal of Environmental Studies

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2019

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tom 28

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nr 3

EN

Three β-type genes coding for carbonic anhydrase and CA activities from Orychophragmus violaceus L. and Brassica juncea L. leaves in response to NaHCO₃ -induced bicarbonate stress were examined. Three full-length cDNA CDS sequences were designated as OvCA1, OvCA3, and OvCA4 in Orychophragmus violaceus, and as BjCA1, BjCA3, and BjCA4 in Brassica juncea; these genes encoding β-CAs were identified and characterized. In particular, OvCA1 and BjCA1 encode two putative chloroplast isoforms. OvCA3 and BjCA3 encode two putative cytosolic isoforms. OvCA4 and BjCA4 encode two putative plasma membrane isoforms. Quantitative real-time RT-PCR analysis revealed that OvCA1 and OvCA4 expressions in Orychophragmus violaceus, BjCA1, and BjCA4 expressions in Brassica juncea changed synchronously with CA activities as bicarbonate stress was intensified. Bicarbonate stress synchronously stimulated OvCA1 and OvCA4 expressions along with CA activities in Orychophragmus violaceus at slight stress level; but it decreased CA activity, BjCA1 and BjCA4 expressions, and stimulated BjCA3 expression in Brassica juncea. Orychoophragmus violaceus could better adapt to slight bicarbonate stress than Brassica juncea due to the former exhibiting higher OvCA3 expression levels and CA activities than the latter. The responses of CA1 and CA4 in Orychophragmus violaceus and CA3 in Brassica juncea to bicarbonate stress partly regulate HCO₃⁻ to water and CO₂ supplied to plants. Diverse CA gene expressions can partially account for different adaptation strategies of the two plant species subjected to different bicarbonate stress levels.

4

Color image analysis via Racah moments

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Wu Y. , Liao S.

Journal of Theoretical and Applied Computer Science

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2015

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tom Vol. 9, nr 4

8--18

EN

In this research, Racah moments color image descriptors are investigated. Channels separation for color images were involved in RGB color space, and Racah moments from each channel were computed individually. In experiments, we have performed the color image reconstructions from different color channels and various orders of Racah moments. Our experimental results have demonstrated that, by applying Racah moments, color images can be completely reconstructed without any information loss. We have also discovered that the individual set of Racah moments will uniquely describe the color image features, while the lower and higher orders of Racah moments will preserve more of features from the bottom right and top left regions of a color image, respectively.

5

Manifestations of sustainable development in China: based on policy study

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Wu Y. , Zhong X.

Economic and Regional Studies

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2022

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tom 15

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nr 3

6

An electricity price-dependent control-limit policy for conditionbased maintenance optimization for power generating unit

100%

Qian X. , Wu Y.

Eksploatacja i Niezawodność

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2016

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tom Vol. 18, no. 2

245--253

EN

For the control-limit policy of condition-based maintenance (CBM), it usually focuses on the internal condition of the equipment while neglecting the un-constant external conditions. However, the electricity price-dependent downtime cost have influence on the cost-effectiveness of control-limit policy for a generating unit in a power system. To make a linkage between CBM and the nonconstant cost model, an electricity price-dependent control-limit policy (EPCLP) is proposed to accommodate the time-dependent downtime costs. For the proposed EPCLP, preventive maintenance control-limits is much flexible to be adjusted to different electricity price levels, and the maintenance cost reduction can be achieved among the planning horizon as a result. The optimal control-limits and maintenance costs for different downtime-cost ratios, reliabilities, covariate processes and electricity price scenarios are analysed to compare the performances between the proposed policy and the constant control-limit policy. Through the sensitivity analysis, the application scope of the proposed policy is evaluated.

PL

Stosując strategie utrzymania ruchu uwzględniające bieżący stan techniczny obiektu (condition based maintenance, CBM) oparte na pojęciu progu konserwacji koniecznej (control limit), najczęściej przywiązuje się wagę do stanu samego sprzętu, ignorując przy tym niestałe warunki zewnętrzne. Należy jednak pamiętać, że w przypadku agregatów prądotwórczych wchodzących w skład układów elektroenergetycznych, koszty przestoju zależne od ceny energii elektrycznej mają wpływ na opłacalność stosowania strategii progu konserwacji koniecznej. Aby powiązać CBM z modelem kosztów niestałych, zaproponowano strategię progu konserwacji koniecznej, w której wysokość progu uzależniona jest od ceny prądu elektrycznego (electricity price-dependent control-limit policy, EPCLP). Przyjęcie takiej strategii pozwala uwzględnić koszty przestojów zależne od czasu. W EPCLP, progi czasowe konserwacji zapobiegawczej są bardzo elastyczne, co pozwala na ich regulację zgodnie z aktualną ceną energii elektrycznej. Strategia umożliwia redukcję kosztów w danym horyzoncie planowania. W celu porównania proponowanej strategii ze strategią stałego progu konserwacji koniecznej, w pracy przeanalizowano optymalne progi czasowe konserwacji koniecznej oraz koszty utrzymania ruchu dla różnych stosunków przestoju do kosztu, różnych wartości niezawodności, różnych procesów kowariantnych oraz różnych scenariuszy zmian cen energii elektrycznej. Zakres zastosowania proponowanej strategii oceniano za pomocą analizy czułości.

7

A new six-DoF parallel mechanism for captive model test

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Lu Y. , Wu J. , Li W. , Wu Y.

Polish Maritime Research

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2020

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tom 27

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nr 3

8

The synergetic effects in a Fenton-like system catalyzed by nano zero-valent iron (nZVI)

80%

Yao H. , Hu S. , Wu Y. , Fan L.

Polish Journal of Environmental Studies

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2019

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tom 28

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nr 4

EN

In this study, the synergetic effects in a Fenton-like system catalyzed by nano zero-valent iron (nZVI Fenton-like system) were studied using nitrobenzene (NB) as a model contaminant. The results showed that homogeneous and heterogeneous Fenton processes existed simultaneously in the nZVI Fenton-like system, and a synergetic removal effect between these processes played a considerable role in NB removal. Through quantitative analysis, 36.5% of NB degradation was attributed to the synergetic degradation effect, which was caused by a synergetic catalytic effect between nZVI and dissolved iron ions (Fe3+ and Fe2+). In the bulk solution, the Fe3+/Fe2+ redox rate was accelerated by nZVI, resulting in the efficiency improvement of homogeneous catalysis; in the surface of nZVI, these dissolved iron ions promoted the electrons transfer from nZVI core to shell, enhancing the efficiency of heterogeneous catalysis. The synergetic catalytic effect also improved the utilization-rate of H2O2 by reducing the decomposition caused by Fe3+/Fe2+ redox compared to that in the homogeneous Fenton system. Based on these results, a possible mechanism of synergetic effects in the nZVI Fenton-like system was proposed. These results could provide insight into an nZVI Fenton-like system.

9

Construction of waveform library in cognitive radar

80%

Guo Y. , Wu Y. , Liu H.

Polish Maritime Research

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2017

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tom S 2

22--29

EN

Based on the thoughts of cognitive radar, Fractional Fourier Transform (FrFT) is used to generate a rotatable waveform libraries of Frank coded/Barker coded waveform in this paper. Then, the ambiguity function is used to analyze the delay resolution, Doppler resolution, delay side-lobe level, and Doppler side-lobe level of the waveform libraries and orthogonality of them is also analyzed. Furthermore, we proved theoretically that there is a fixed coordinate transformation between the waveforms of library and its origin waveform. Therefore, the Cramér-Rao low bound (CRLB) of motion parameters can be computed easily using the waveforms of the libraries, which facilitate the subsequent waveform scheduled work. Simulation results show that the library waveforms can reduce delay resolution to satisfy the different situations and can bring significant benefits for delay resolution, orthogonality and reuse interval.

10

Firing temperature of a clay core sample in a bronze tripod from Daxinzhuang Site in China using TL techniques

80%

Wu Y. , Jin Z. , Fan A. , Fang H.

Geochronometria

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2013

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tom Vol. 40, no. 4

317--321

EN

In this paper, we studied the thermal history of a clay core sample from one leg of a bronze tripod unearthed at Daxinzhuang Site, Shandong, China. The properties of the luminescence signals of quartz depend on the maximum temperature at which the quartz was annealed in the past. We ex-amined the feasibility of measuring the thermoluminescence (TL) sensitivity change of quartz for ex-ploring the firing temperature of archaeological materials. The sensitization factor of the 110°C TL peak (S2/S1) and the ratio of the 210°C TL peak to the 110°C TL peak at different annealing tempera-tures were utilized to unveil the firing temperature in the clay core sample. The firing temperature of the clay core sample was approximately 700°C-800°C, proving the clay core has been fired. This re-sult proved that the clay core has been fired by human agencies and indicated on the temperature of the clay core in drying and firing given by the foundry workers before the actual casting step.

11

Effect of predator-induced maternal stress during gestation on growth in root voles Microtus oeconomus

80%

Bian J. , Wu Y. , Liu J.

Acta Theriologica

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2005

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tom 50

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nr 4

473-482

EN

We studied the effect of maternal stress evoked by a severe stressor from the cues of predation risk during gestation on the growth of offspring in root volesMicrotus oeconomus Pallas, 1776. Body mass of both male and female offspring was significantly reduced in the period from birth to weaning. Females showed compensatory growth after weaning, whereas males maintained low body mass at weaning into adulthood. Maternal stress led to an elevated plasma corticosterone level in male offspring, but did not affect that of female offspring. Corticosterone levels remained elevated in males from stressed dams into adulthood. Increased levels of plasma corticosterone may have led to the inhibition of pituitary growth hormone and a chronically abnormal energy mobilization, considering the greater energy and metabolic requirements of male offspring, this may account for the sex-specific differences in compensatory growth. We suggest that in the high stress situation, endocrine-based sex-biased effects of maternal stress as a primary factor can lead to long-term physical and ecological consequences for male offspring.

12

Experimental study on amplitude-frequency characteristic and basin stability of horizontally driven pendulum

80%

Jia J. , Wu Y. , Liu W. , Xiao J.

Journal of Theoretical and Applied Mechanics

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2016

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tom Vol. 54 nr 3

839--846

EN

In this article, an inverted pendulum system is set up to explore the dynamics of a horizontally driven pendulum which exhibits a great variety of dynamical behavior and appears in a wide range of applications in the field of engineering. The facility is efficient to experimentally explore two kinds of coexisting movement patterns in the horizontally driven pendulum, i.e. in-phase and anti-phase patterns between the angular velocity of the pendulum rod and the direction of the driving forces. Theoretical analysis is applied to reveal the regimes of the coexistence of the two movement patterns, which is promising to control the system to a desired pattern.

13

miR-590-3p Alleviates diabetic peripheral neuropathic pain by targeting RAP1A and suppressing infiltration by the T cells

80%

Wu Y. , Gu Y. , Shi B.

Acta Biochimica Polonica

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2020

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tom 67

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nr 4

14

Effects of livestock exclusion on vegetation and soil properties under two topographic habitats in an alpine meadow on the eastern Qinghai-Tibetan Plateau

80%

Shi F. , Chen H. , Wu Y. , Wu N.

Polish Journal of Ecology

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2010

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tom Vol. 58, nr 1

125-133

EN

Long-term overgrazing has resulted in grassland deterioration and even desertification on the eastern Qinghai-Tibetan Plateau. In this paper, we examined the characteristics of vegetation and soil properties in the livestock-excluded pastures and the adjacent grazed pastures under two topographic habitats (the flat valley and the south-facing slope). Seven-year exclusion of livestock has enhanced aboveground live biomass, root biomass and litter accumulation. Livestock exclusion has also increased soil bulk density and soil water content, soil organic C concentration, total N concentration and its transformation rate, and soil microbial activity. The results showed that livestock exclusion has facilitated vegetation recovery and improved physical, chemical and biological properties of soil. However, livestock exclusion has significantly decreased graminoid biomass accumulation, especially on the flat valley, the biodiversity also significantly decreased there. The results suggested that long-term livestock exclusion was disadvantageous for palatable forage production and biodiversity protection on the flat valley. Compared to the flat valley, the grassland on the south-facing slope was under more severe degradation, and the reversion was in a slower process. Thus, the optimal grassland management in the livestock-excluded pasture on the flat valley should include a low or moderate grazing intensity or adopt an alternate grazing system, but more effective and even longer livestock exclusion practice should be taken on the south-facing slope.

15

A multi-stage risk-adjusted control chart for monitoring and early-warningof products sold with two-dimensional warranty

80%

Dong F. , Liu Z. , Wu Y. , Hao J.

Eksploatacja i Niezawodność

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2018

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tom Vol. 20, no. 2

300--307

EN

Warranty claims data contain valuable information about the quality and reliability of products. The monitoring and early-warning of warranty claims data are of great significance to the manufacturer by identifying and solving the emerging quality or reliability problem as soon as possible. However, though it has been used widely in the automobile industry, there are no studies that have been carried out on the monitoring and early-warning of claims data for products sold with two-dimensional warranty. In order to fill this gap, fitting the two-dimensional warranty claims data with accelerated failure model (AFT), a multi-stage riskadjusted control chart is proposed by this paper, for which a reasonable product sales tracking time and a monitoring time are suggested to reduce the influence of sales delay and fluctuating claim rates. Comparing with traditional Cumulative Sum Control Chart (CUSUM), the applicability and availability of the proposed model are demonstrated in the final.

PL

Roszczenia gwarancyjne stanowią cenne źródło informacji na temat jakości i niezawodności produktów. Monitorowanie danych dotyczących roszczeń gwarancyjnych i wczesne ostrzeganie w oparciu o te dane ma wielkie znaczenie dla producenta, ponieważ pozwala rozpoznawać i rozwiązywać pojawiające się problemy związane z niezawodnością w jak najkrótszym czasie. Chociaż ten rodzaj monitorowania i wczesnego ostrzegania jest szeroko stosowany w przemyśle motoryzacyjnym, nie przeprowadzono dotąd żadnych badań na temat tych procesów w odniesieniu do produktów sprzedawanych z gwarancją dwuwymiarową. W celu wypełnienia tej luki, dane o reklamacjach składanych na podstawie gwarancji dwuwymiarowych dopasowano modelem uszkodzeń przyspieszonych (accelerated failure model, AFT), a następnie przedstawiono koncepcję karty kontrolnej monitorowania wieloetapowego z korektą ryzyka, dla której zaproponowano odpowiedni czas śledzenia sprzedaży produktu i czas monitorowania, mając na uwadze zmniejszenie wpływu opóźnień w sprzedaży i wahań liczby roszczeń zgłaszanych z tytułu gwarancji. Możliwości zastosowania i dostępność proponowanego modelu porównano z tradycyjną kartą sum skumulowanych.

16

Changes in the polarization states of random electromagnetic vortex beams propagating in biological tissues

80%

Duan M. , Wu Y. , Su N.

Optica Applicata

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2018

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tom Vol. 48, nr 2

297--309

EN

The changes in the on-axis polarization state of random electromagnetic Gaussian Schell-model vortex beams propagating in biological tissues have been studied. In different media propagation, the bigger Cn2 is, the earlier the appearance of the inflexion points in the on-axis degree of the polarization P(0, 0, z) is. As the propagation distance increases, the values of the on-axis orientation angle θ(0, 0, z) undergo several processes: at the beginning they are positive, then gradually increase to the maximum, jump to a negative value, finally tend to a fixed value. The bigger Cn2 corresponds to previous jumping position. In the entire propagation, the values of the on-axis ellipticity ε(0, 0, z) are larger than the initial one. There exists a phenomenon that the values of P(0, 0, z), θ(0, 0, z) and ε(0, 0, z) keep their extremes in a length of propagation distances for the far infrared beams. The maximum of P(0, 0, z) is the smallest and the jumping range of θ(0, 0, z) is the largest for the ultraviolet beams. Compared with σyy > σxx, the changes in magnitudes in P(0, 0, z) are more obvious when σyy < σxx, the changes in θ(0, 0, z) are just the reverse for σyy < σxx.

17

A Comparative Study of Algebra Viewpoint and Information Viewpoint in Attribute Reduction

80%

Wang G.-Y. , Zhao J. , An J. , Wu Y.

Fundamenta Informaticae

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2005

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tom Vol. 68, nr 3

289--301

EN

Attribute reduction is an important issue in rough set theory and has already been studied from the algebra viewpoint and information viewpoint of rough set theory respectively. However, the concepts of attribute reduction based on these two different viewpoints are not equivalent to each other. In this paper, we make a comparative study on the quantitative relationship between some basic concepts of rough set theory like attribute reduction, attribute significance and core defined from these two viewpoints. The results show that the relationship between these conceptions from the two viewpoints is rather an inclusion than an equivalence due to the fact that the rough set theory discussed from the information point of view restricts attributes and decision tables more specifically than it does when considered from the algebra point of view. The identity of the two viewpoints will hold in consistent information decision tables only. That is, the algebra viewpoint and information viewpoint are equivalent for a consistent decision table, while different for an inconsistent decision table. The results are significant for the design and development of methods for information reduction.

18

The comparison of the effects of two approaches to control gully erosion in the Black Soil Region of China

80%

Dong Y. , Wu Y. , Wang W.

Landform Analysis

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2011

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tom Vol. 17

43-46

EN

Gully erosion is an important form of soil erosion, however, little was done on the effect of gully erosion controlling approaches. A program for controlling gully erosion was carried out in Heshan Farm in black soil region of northeast China from 1994 to 1996 include two approaches: "Soil fill" and "Vegetation cover". From the investigation at 2009, Soil fill approach can protect the original place of gully erosion well, but this apporach ignores the whole impact at the catchment scale, and may cause to new gully appear. "Vegetation cover" approach is better to control gully erosion than "Soil fill" approach, but has little effect on controlling the headcut retreat.

19

Cholesterol (Blood lipid) lowering potential of Rosuvastatin chitosan nanoparticles for atherosclerosis: Preclinical study in rabbit model

80%

Chen L. , Wang C. , Wu Y.

Acta Biochimica Polonica

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2020

|

tom 67

|

nr 4

20

An on-line phase measuring profilometry based on modulation

80%

Wu Y. , Cao Y. , Lu M. , Li K.

Optica Applicata

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2012

|

tom Vol. 42, nr 1

31-41

EN

An on-line phase measuring profilometry (PMP) based on Stoilov's algorithm which can be used for on-line 3-D shape inspection is proposed in this paper. A stationary sinusoidal grayscale fringe pattern is projected onto the object kept on the production line, and an immobile charge-coupled device (CCD) is used to capture five deformed patterns equidistantly. The phase distribution is calculated by using Stoilov's algorithm, and the height distribution of the inspected object is obtained through the relation of phase-height mapping. When inspected object moves, the positions of images in different deformed patterns change, so the pixel matching is implemented to acquire the equivalent phase-shifting which meets the requirement of Stoilov's algorithm. Modulation which represents the contour of inspected object is used as the template to perform the pixel matching for the first time in this paper. Computer simulation and experiment verified the effectiveness of the method.