Wyniki wyszukiwania - Biblioteka Nauki

1

Ordered Weighted Hesitant Fuzzy Information Fusion-Based Approach to Multiple Attribute Decision Making with Probabilistic Linguistic Term Sets

100%

Farhadinia B. , Xu Z.

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2018

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tom Vol. 159, nr 4

361--383

EN

Recently, an extension of typical hesitant fuzzy element (HFE) called the ordered weighted hesitant fuzzy element (OWHFE) has been proposed to allow the membership of a given element is to be defined in terms of several possible values together with their importance weights. Moreover, the concept of probabilistic linguistic term sets (PLTSs) has been defined to extend hesitant fuzzy linguistic term sets (HFLTSs) by adding probabilities without loss of any original linguistic information. In fact, the concept of PLTS allows the membership of a given element is to be defined in terms of several possible linguistic values over an object together with the probabilistic information of the set of values. However, the PLTSs have some drawbacks in comparison to the newly defined concept OWHFEs, and such disadvantages of the PLTSs can be prevented by using the OWHFEs. This reveals the need of first defining the modified-PLTS (M-PLTS), and then transforming the M-PLTSs to the OWHFEs which will be the heart of this contribution. Finally, to demonstrate the advantage of the proposed methods, we implement again a number of practical problems that were previously associated with PLTSs.

2

Effect of pH on adsorption and desorption of hexadecyl trimethyl ammonium bromide from silicate surface

100%

Karaguzel C. , Xu Z.

Physicochemical Problems of Mineral Processing

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2017

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tom Vol. 53, iss. 2

750--757

EN

Hexadecyl trimethyl ammonium bromide (HTAB), a cationic surfactant, is physically adsorbed on negatively charged silicate surfaces due to electrostatic forces. This reversible adsorption process is important for surfactant regeneration in some industrial applications such as waste water treatment. Cationic surfactant adsorption and desorption from silica surfaces were studied using several methods such as UV, FTIR, XPS, and XRD. However, most of these methods are time independent and ex situ in nature. Quartz crystal microbalance with dissipation monitoring (QCM-D) is a power tool that can determine the amount and thickness of the deposited material on the surface in situ as a function of time. In this study, the adsorption and desorption characteristic of HTAB was studied on the silica sensor surface by using QCM-D. The adsorption and desorption tests were performed at a constant HTAB concentration (5·10-4 M, close to CMC of HTAB) at different pH values (3, 5.5, 6.5 and 10). The results obtained from these studies clearly showed that pH is a critical factor determining the adsorption and desorption processes.

3

An MST cluster analysis method under hesitant fuzzy environment

100%

Zhang X. , Xu Z.

Control and Cybernetics

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2012

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tom Vol. 41, no. 3

645-666

EN

Hesitant fuzzy sets (HFSs) are useful means to describe and deal with uncertain data. In this article, a minimal spinning tree (MST) algorithm based clustering technique under hesitant fuzzy environment is proposed. We first introduce the concepts of graph, MST, HFS, and hesitant fuzzy distance. Then, we present a hesitant fuzzy MST clustering algorithm to perform clustering analysis of HFSs via some hesitant fuzzy distances, and finally illustrate the effectiveness of our algorithm through two numerical examples.

4

Hysterothylacium gibsoni sp. nov. and H. tetrapteri (Bruce et Cannon, 1989) (Nematoda: Ascaridida) from the Chinese marine fishes

80%

Xu Z. , Li L. , Zhang L.-P.

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tom 59

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nr 2

EN

A new species of ascaridoid nematode, Hysterothylacium gibsoni sp. nov., is described based on specimens collected from the intestine of the slender lizardfish Saurida elongata (Temminck et Schlegel) (Aulopiformes: Synodontidae) in the Yellow Sea, China. The new species differs from its congeners by its small body size (12.8–13.2 mm), the absence of cervical alae, a very short intestinal caecum (representing 8.86–9.52% of oesophageal length) and a long ventricular appendix (intestinal caecum to ventricular appendix ratio 1:15.3–20.0), short spicules (0.38–0.41 mm, representing 2.97–3.11% of body length), the number and arrangement of the caudal papillae (25–28 pairs arranged as follows: 18–22 pairs precloacal, 3 pairs paracloacal, and 3–4 pairs postcloacal). In addition, Hysterothylacium tetrapteri (Bruce et Cannon, 1989) is also redescribed based on the material collected from the striped marlin Kajikia audax (Philippi) (Perciformes: Istiophoridae) in the South China Sea.

5

The relationship between leaf and ecosystem CO2 exchanges in a maize field

80%

Xu Z. , Zhou G. , Han G. , Li Y.

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nr 08

6

Preparation and microwave absorption of M type ferrite nanoparticle composites

80%

Shen G. Z. , Cheng G. S. , Cao Y. , Xu Z.

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tom Vol. 28, No. 1

327--334

EN

The sol-gel method was used to obtain M type BaFe12O19 ferrite nanoparticles. Rod like and flake like ferrite nanoparticles can be successfully fabricated by controlling the heating process of the precursor. The phase attributes, morphology and grain size of BaFe12O19 ferrite were characterized by TEM and XRD. The complex permittivity and permeability of ferrite epoxy resin composites were measured in the Ku waveband (12.4-18 GHz). Ferrite composites containing short carbon fibres have also been fabricated in order to obtain higher complex permittivities of the composites. The reflectivities of these ferrite composites were calculated according to the measured electromagnetic parameters. The results show that the microwave absorption properties of ferrite composites can be effectively improved by filling them with short carbon fibres.

7

Vision-based high accuracy work-piece inspection from profiles

80%

Xu Z. , Toncich D. , Wu H.

Machine Graphics and Vision

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2001

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tom Vol. 10, No. 2

155-174

EN

The objective of the research documented herein was to investigate high-accuracy identification and measurement of a work-piece through edge detection, and to derive its three-dimensional properties from a profile of the work-piece image. A number of techniques for providing the transformation of the image are also described. The helix, helicoid and range of geometric entities have been selected to demonstrate the methodology and to highligh various aspect of the proposed techniques.

8

Morphological and molecular characterization of Raphidascaris (Ichthyascaris) lophii (Wu, 1949) (Nematoda, Anisakidae) from marine fishes from China, with a key to the species of the subgenus Ichthyascaris

80%

Xu Z. , Zhang L.-P. , Liu B.-C. , Li L.

Acta Parasitologica

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2012

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tom 57

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nr 3

EN

The little known ascaridoid nematode Raphidascaris (Ichthyascaris) lophii (Wu, 1949) is redescribed and illustrated based on newly collected specimens from the five different marine fishes: Lophius litulon (Jordan) (Lophiiformes: Lophiidae), Lophiomus setigerus (Vahl) (Lophiiformes: Lophiidae), Antennarius hispidus (Bloch et Schneider) (Lophiiformes: Antennaridae), Zeus faber Linnaeus (Zeiformes: Zeidae) and Ostichthys japonicus (Cuvier) (Beryciformes: Holocentridae) from the East and South China Sea. This species differs from all congeners in the subgenus Ichthyascaris by the length of the ventricular appendix (0.52–0.98 mm long), the number and arrangement of caudal papillae (26–32 pairs of precloacal, 3–4 pairs of paracloacal and 8–11 pairs of postcloacal) and the length of the spicules (0.49–0.88 mm long, representing 3.08–4.70% of body length). In addition, nematodes collected from these five different fishes have been characterized using molecular methods by sequencing and analysing the internal transcribed spacer (ITS) of ribosomal DNA. No variation in size and nucleotide polymorphisms is detected within the target sequence among all samples analysed. These data contribute to facilitate an accurate diagnosis of this poorly known nematode. An identification key to the species of the subgenus Ichthyascaris is also provided.

9

Predicting current and future invasion of Solidago canadensis; a study from China

80%

Xu Z. , Peng H. , Feng Z. , Abdulsalih N.

Polish Journal of Ecology

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2014

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tom Vol. 62, nr 2

263--271

EN

Solidago canadensis, which is native to North America, is considered to be the most widespread invasive alien plant. The invasion of Solidago canadensis in China has resulted in serious environmental problems. Therefore, understanding the relationship between the geographical distribution of S. canadensis and bioclimatic variables, and then predicting the potential distribution of this species is essential for management actions and practices. Although several studies have delineated the potential distribution of S. canadensis in China, how this species would respond to variations in future climatic conditions remains unclear. In the present study, we predicted the potential distribution of S. canadensis under current and future climatic conditions using species distribution models. We also analyzed range shifting of this species under current and future climatic conditions. We arrived at several conclusions. First, the potential distribution of S. canadensis may expand 40% under future climatic condition compare with that of under current condition. Second, mean diurnal range, isothermality, mean temperature of the wettest quarter, mean temperature of the warmest quarter, precipitation of the driest month, and precipitation seasonality (coefficient of variation) are key bioclimatic variables in determine the potential distribution of S. canadensis. Third, expansion of S. canadensis can be partly attributed to the relatively warmer and wetter future bioclimatic condition than current one.

10

A review of characteristics of landfilled municipal solid waste in several countries: physical composition, unit weight, and permeability coefficient

80%

Yang R. , Xu Z. , Chai J.

Polish Journal of Environmental Studies

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2018

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tom 27

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nr 6

EN

The characteristics of landfilled municipal solid waste have great influence on the design, operation, and management of landfills, affecting settlement, slope stability, and leachate/gas well integrity. Through analysis and study we observed that the landfill method is widely used to dispose of municipal solid waste (MSW), especially in developing countries. The research results of MSW landfill properties are different due to waste inhomogeneity. In this paper, MSW physical composition, unit weight, and permeability coefficient of landfills in several countries were reviewed and discussed. Landfilled MSW has strong regional and temporal characteristics. Landfilled MSW of developing countries has high organic content ranges from 75.00% to 97.15%. The organic contents in landfills of most developed regions are relatively small. The unit weight ranged from 4.9-17.8 kN/m³ and the permeability coefficient ranged from 3.5×10⁻² cm/sec to 5.0×10⁻⁸ cm/sec within 60 m. In the process of waste degradation, MSW physical composition, unit weight, and permeability coefficient are changed. Waste classification improves the recovery and utilization of landfill and reduces the amount of waste, which affects the characteristics of landfilled MSW. Thus, strengthening waste classification, recycling, and recovery of MSW is significant and meaningful for construction, operation, and management of landfills.

11

Predicting current and future invasion of Solidago canadensis: a study from China

80%

Xu Z. , Peng H. , Feng Z. , Abdulsalih N.

Polish Journal of Ecology

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2014

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tom 62

|

nr 2

EN

Solidago canadensis, which is native to North America, is considered to be the most widespread invasive alien plant. The invasion of Solidago canadensis in China has resulted in serious environmental problems. Therefore, understanding the relationship between the geographical distribution of S. canadensis and bioclimatic variables, and then predicting the potential distribution of this species is essential for management actions and practices. Although several studies have delineated the potential distribution of S. canadensis in China, how this species would respond to variations in future climatic conditions remains unclear. In the present study, we predicted the potential distribution of S. canadensis under current and future climatic conditions using species distribution models. We also analyzed range shifting of this species under current and future climatic conditions. We arrived at several conclusions. First, the potential distribution of S. canadensis may expand 40% under future climatic condition compare with that of under current condition. Second, mean diurnal range, isothermality, mean temperature of the wettest quarter, mean temperature of the warmest quarter, precipitation of the driest month, and precipitation seasonality (coefficient of variation) are key bioclimatic variables in determine the potential distribution of S. canadensis. Third, expansion of S. canadensis can be partly attributed to the relatively warmer and wetter future bioclimatic condition than current one.

12

The Computational Complexity of Universality Problems for Prefixes, Suffixes, Factors, and Subwords of Regular Languages

80%

Rampersad N. , Shallit J. , Xu Z.

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2012

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tom Vol. 116, nr 1-4

223-236

EN

In this paper we consider the computational complexity of the following problems: given a DFA or NFA representing a regular language L over a finite alphabet Σ, is the set of all prefixes (resp., suffixes, factors, subwords) of all words of L equal to Σ*? In the case of testing universality for factors of languages, there is a connection to two classic problems: the synchronizing words problem of Černy, and Restivo's conjecture on the minimal uncompletable word.

13

Pseudopower Avoidance

80%

Chiniforooshan E. , Kari L. , Xu Z.

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tom Vol. 114, nr 1

55-72

EN

Repetition avoidance has been intensely studied since Thue’s work in the early 1900's. In this paper, we consider another type of repetition, called pseudopower, inspired by theWatson-Crick complementarity property of DNA sequences. A DNA single strand can be viewed as a string over the four-letter alphabet {A,C,G, T }, whereinA is the complement of T , while C is the complement of G. Such a DNA single strand will bind to a reverse complement DNA single strand, called its Watson-Crick complement, to form a helical double-stranded DNA molecule. The Watson-Crick complement of a DNA strand is deducible from, and thus informationally equivalent to, the original strand. We use this fact to generalize the notion of the power of a word by relaxing the meaning of "sameness" to include the image through an antimorphic involution, the model of DNA Watson- Crick complementarity. Given a finite alphabet &Sigma: an antimorphic involution is a function Θ : Σ*→Σ* which is an involution, i.e., Θ2 equals the identity, and an antimorphism, i.e., Θ(uv) = Θ(v)Θ(u), for all u∈Σ* For a positive integer k, we call a word w a pseudo-kth-power with respect to Θ if it can be written as w = u1 . . . uk, where for 1 ≤ i, j ≤ k we have either ui = uj or ui = Θ(uj). The classical kth-power of a word is a special case of a pseudo-kth-power, where all the repeating units are identical. We first classify the alphabets Σ and the antimorphic involutions . for which there exist arbitrarily long pseudo-kth-power-free words. Then we present efficient algorithms to test whether a finite word w is pseudo-kth-power-free.

14

Lightning Characteristics Based on Date Observed with Shanghai Lightning Location System, China

80%

Wenrong S. , Jinxiu Z. , Xu Z. , Rong X.

Przegląd Elektrotechniczny

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2012

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tom R. 88, nr 11a

152-156

EN

In this paper, an investigation into cloud-to-ground lightning activity data from the year of 2001 to 2010 collected by Shanghai lighting location system is shown, including the ground flash density maps of Shanghai City and comparison of annual lightning days with thunderstorm days collected by the Shanghai Meteorological Agency. At last, the peak current cumulative distribution of cloud-to-ground flashes is also discussed, which is suggested to be used in the design of transmission line lightning-proof for the Shanghai Municipal Electric Power Company.

PL

W artykule przedstawiono analizę danych dotyczących liczby wyładowań atmosferycznych doziemnych z lat 2001-2010 w obszarze Szanghaju wraz z mapami i analizą rozkładu czasowego.

15

Soil C:P ratio along elevational gradients in Picea schrenkiana forest of Tianshan Mountains

80%

Cao Y. , Wang Y. , Xu Z.

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tom 66

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nr 4

EN

Forest soils potentially store a large pool of carbon and phosphorus. A deep understanding of the total carbon and phosphorus stock in forest soils is vital in the assessment of the nutrients dynamics in forest ecosystems. This study examined the effects of elevation, soil depth, and climatic variables, specifically mean annual temperature (MAT) and mean annual precipitation (MAP), on soil carbon and organic phosphorus in Schrenk's spruce (Picea schrenkiana) forest at Tianshan Mountains. Results showed that soil organic carbon (SOC) significantly increased while organic phosphorus decreased with elevation. Interestingly, carbon increased faster with increasing elevation in the alluvial horizon than in the leached horizon, demonstrating the important role of deep soils in carbon sequestration potential. SOC concentration decreased with soil depth, whereas phosphorus concentration initially decreased and then increased. SOC had no significant relationships with MAT and MAP, whereas phosphorus concentration decreased with MAT. Similar to the impacts of MAT and MAP on SOC, these two climatic variables also exerted no significant influence on C:P ratio.

16

Adaptive edge-preserving filtering

80%

Xu Z. , Toncich D. , Stefani S.

Machine Graphics and Vision

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1999

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tom Vol. 8, No. 3

353-365

EN

The research, upon which this paper is based, focused upon the accurate acquisition of images that could be used for precision measurement processes. These precision measurements wou;d either be used as a part of an inspection system or as a feedback mechanism to improve process quality. In this paper, a novel adaptive filtering method is proposed for the purpose of reducing noise and removing spurious pixel values on images, acquired within a manufacturing environment without blurring edges or displacing identified boundaries. The paper documents the experimental outcome derived from testing this novel filtering technoque.

17

Soil C:P Ratio along Elevational Gradients in Picea schrenkiana Forest of Tianshan Mountains

80%

Cao Y. , Wang Y. , Xu Z.

Polish Journal of Ecology

|

2018

|

tom Vol. 66, nr 4

325--336

EN

Forest soils potentially store a large pool of carbon and phosphorus. A deep understanding of the total carbon and phosphorus stock in forest soils is vital in the assessment of the nutrients dynamics in forest ecosystems. This study examined the effects of elevation, soil depth, and climatic variables, specifically mean annual temperature (MAT) and mean annual precipitation (MAP), on soil carbon and organic phosphorus in Schrenk's spruce (Picea schrenkiana) forest at Tianshan Mountains. Results showed that soil organic carbon (SOC) significantly increased while organic phosphorus decreased with elevation. Interestingly, carbon increased faster with increasing elevation in the alluvial horizon than in the leached horizon, demonstrating the important role of deep soils in carbon sequestration potential. SOC concentration decreased with soil depth, whereas phosphorus concentration initially decreased and then increased. SOC had no significant relationships with MAT and MAP, whereas phosphorus concentration decreased with MAT. Similar to the impacts of MAT and MAP on SOC, these two climatic variables also exerted no significant influence on C:P ratio.

18

A new palmprint segmentation method based on an inscribed circle

80%

Li W. , Xia S. , Zhang D. , Xu Z.

Image Processing & Communications

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2003

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tom Vol. 9, no 1-2

63-70

EN

Palmprint segmentation, which involves extracting a suitable part of a palmprint for feature extraction and matching, provides the basis for palmprint identification. In this paper, we propose using an inscribed circie for palmprint segmentation. The proposed method is able to obtain the contour of a palmprint and calculate the biggest inscribed circle for the contour. The part of the palmprint that falls within the circie is extracted for further processing. In comparison to the earlier proposal of a segmentation method that uses a square, the new method can deal with more distortions in the original images, provides a higher accuracy and includes more meaningful features. Experimental results demonstrate the effectiveness of using the inscribed circle for segmentation.

19

Morphological and molecular characterization of Cucullanus bourdini Petter et Le Bel, 1992 (Ascaridida: Cucullanidae) from the yellowback fusilier Caesio xanthonota Bleeker (Perciformes: Caesionidae)

80%

Xu Z. , Chen H.-X. , Ju H.-D. , Li L.

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nr 1

20

Key-point Detection based Fast CU Decision for HEVC Intra Encoding

80%

Xu Z. , Min B. , Cheung R. C. C.

International Journal of Electronics and Telecommunications

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2018

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tom Vol. 64, No. 3

321--327

EN

As the most recent video coding standard, High Efficiency Video Coding (HEVC) adopts various novel techniques, including a quad-tree based coding unit (CU) structure and additional angular modes used for intra encoding. These new techniques achieve a notable improvement in coding efficiency at the penalty of significant computational complexity increase. Thus, a fast HEVC coding algorithm is highly desirable. In this paper, we propose a fast intra CU decision algorithm for HEVC to reduce the coding complexity, mainly based on a key-point detection. A CU block is considered to have multiple gradients and is early split if corner points are detected inside the block. On the other hand, a CU block without corner points is treated to be terminated when its RD cost is also small according to statistics of the previous frames. The proposed fast algorithm achieves over 62% encoding time reduction with 3.66%, 2.82%, and 2.53% BD-Rate loss for Y, U, and V components, averagely. The experimental results show that the proposed method is efficient to fast decide CU size in HEVC intra coding, even though only static parameters are applied to all test sequences.