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1
Content available Applications and Comparison of Continuous Wavelet Transforms on Analysis of A-wave Impulse Noise
100%
Qin J. , Sun P.
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tom Vol. 40, No. 4
503--512
EN
Noise induced hearing loss (NIHL) is a serious occupational related health problem worldwide. The A-wave impulse noise could cause severe hearing loss, and characteristics of such kind of impulse noise in the joint time-frequency (T-F) domain are critical for evaluation of auditory hazard level. This study focuses on the analysis of A-wave impulse noise in the T-F domain using continual wavelet transforms. Three different wavelets, referring to Morlet, Mexican hat, and Meyer wavelets, were investigated and compared based on theoretical analysis and applications to experimental generated A-wave impulse noise signals. The underlying theory of continuous wavelet transform was given and the temporal and spectral resolutions were theoretically analyzed. The main results showed that the Mexican hat wavelet demonstrated significant advantages over the Morlet and Meyer wavelets for the characterization and analysis of the A-wave impulse noise. The results of this study provide useful information for applying wavelet transform on signal processing of the A-wave impulse noise.
2
Content available remote Stable carbon and nitrogen isotopes reveal the food diet of Tibetan antelope Pantholops hodgsoni (Abel 1826) in Kekexili Nature Reserve (China)
80%
Sun P. , Yu H.-H. , Zhao X.-Q. , Wang D.-H.
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tom Vol. 61, nr 2
365--371
EN
The stable isotope technique has been widely used to infer the dietary ecology of a range of animal species. The δ13C technique provides a valuable tool for researchers when designing pastures for dual environmental and production purposes. Tibetan antelope, Pantholops hodgsoni (chiru), is endemic species to the high-altitude Qinghai-Tibet Plateau of western China – Kekexili Nature Reserve area. The aim of this study was to identify the food diet of Tibetan antelope among plants with C3 and C4 photosynthetic pathways. Faeces and plant samples were collected at the Kekexili Nature Reserve (KNR, 34°19’ ~ 36°16’N, 89°25’ ~94°05’E) in Qinghai Province, China. Stable isotope values of carbon and nitrogen of faeces and plant samples were measured under EAMS (element-analysis meter and spectrometer) conditions. Enrichment and food content ratio were calculated according to previous research methods to determine the relative importance of plant sources in the food diet of Tibetan antelopes. The results indicate that faecal samples provided the most convenient and uninjurious sources to predict the food diet and that C3 plants were selected as the food by chiru. Dualisotope multiple-source mixing model suggested that the food content of antelope is including Gramineae, Cyperaceae, Compositae, Leguminosae, and Cruciferae. An understanding of what chiru selects allows for development of appropriate grazing and protecting strategies, especially in fragile ecosystem. According to our knowledge, this is the first essay to reveal the food diet of chiru with stable isotope analysis method.
3
Opposite-sex sibling recognition in adult root vole, Microtus oeconomus Pallas: phenotype matching or association
80%
Sun P. , Zhu W. , Zhao X.
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nr 4
701-708
EN
Hypothesis of phenotype matching and association are the most likely mechanisms in kin recognition. These hypotheses were tested by observing behavioral responses of cross-fostered root voles to urine cues from familiar and unfamiliar kin and non-kin. In experiment I, approach latency by males was significantly longer in response to non-sibling reared together (NSRT) than to non-sibling reared apart (NSRA) females, whereas, investigatory and sniffing time were significantly less in response to NSRT than to NSRA. However females showed no event bias to odors from NSRT and NSRA males. In experiment II, the behavioral responses of males and females to urine odors from siblings reared apart (SRA) and NSRA were not related to the degree of genetic relationship. It was concluded that: Association mechanism is used by male root voles in opposite-sex sibling recognition; Female voles possibly adopt multiple recognition mechanisms in different social tests.
4
Content available remote Opposite-sex sibling recognition in adult root vole, Microtus oeconomus Pallas : phenotype matching or association?
80%
Sun P. , Zhu W. , Zhao X.
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tom Vol. 56, nr 4
701-708
EN
Hypothesis of phenotype matching and association are the most likely mechanisms in kin recognition. These hypotheses were tested by observing behavioral responses of cross-fostered root voles to urine cues from familiar and unfamiliar kin and non-kin. In experiment I, approach latency by males was significantly longer in response to non-sibling reared together (NSRT) than to non-sibling reared apart (NSRA) females, whereas, investigatory and sniffing time were significantly less in response to NSRT than to NSRA. However females showed no event bias to odors from NSRT and NSRA males. In experiment II, the behavioral responses of males and females to urine odors from siblings reared apart (SRA) and NSRA were not related to the degree of genetic relationship. It was concluded that: Association mechanism is used by male root voles in opposite-sex sibling recognition; Female voles possibly adopt multiple recognition mechanisms in different social tests.
5
Content available remote Chemical communication in mammal population : urinary olfactory chemosignals in lactating female root voles (Microtus oeconomus Pallas)
80%
Yu H. , Zhao X. , Yue P. , Sun P.
Polish Journal of Ecology
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2010
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tom Vol. 58, nr 1
153-165
EN
Urine is a major source of mammalian chemosignals. Among rodents, the sexual attractiveness and chemical constituents of urine vary with different reproductive stages. We confirmed the differing sexual attractiveness to males of the urine of lactating and non-lactating female root voles (Microtus oeconomus) and analyzed individual coding forms and lactation-specific putative pheromones, using gas chromatography-mass spectrometry (GC-MS). First, we documented the behavioral preference of male voles to urine odors of lactating and non-lactating females in a choice maze. The results showed that male voles engaged in more sniffing behavior and spent more time self-grooming in response to urinary odors of lactating females than to urinary odors of non-lactating females. We then used GC-MS to analyze the urine.s individual coding forms and potential chemosignals. We identified 34 volatile compounds, corresponding to 34 GC peaks, in the urine of female voles. The components identified in the urine samples included benzo- forms, alkanes, alkenes, acids, esters, pyrans, alcohols, and other volatile compounds. 12 basic volatiles were detected in all urine samples while others were specific to individuals. (E)5-octadecene and (N) hexadecanoic acid were specific to the lactating stage. A quantitative comparison of the relative abundances of the basic GC peaks showed no difference between the lactating and non-lactating stages, suggesting that individual identity is coded in digital form. We suggest that the urine of lactating females possesses stronger sexual attraction cues because of the presence of (E)5-octadecene and (N)hexadecanoic acid, which are putative lactating pheromones. However, the specific function of the pheromones should be assessed further by bioassay.
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Content available remote A Comprehensive Survey on Fractional Fourier Transform
61%
Zhang Y. , Wang S. , Yang J.-F. , Zhang Z. , Phillips P. , Sun P. , Yan J.
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tom Vol. 151, nr 1/4
1--48
EN
The Fractional Fourier transform (FRFT) is a relatively novel linear transforms that is a generalization of conventional Fourier transform (FT). FRFT can transform a particular signal to a unified time-frequency domain. In this survey, we try to present a comprehensive investigation of FRFT. Firstly, we provided definition of FRFT and its three discrete versions (weighted-type, sampling-type, and eigendecomposition-type). Secondly, we offered a comprehensive theoretical research and technological studies that consisted of hardware implementation, software implementation, and optimal order selection. Thirdly, we presented a survey on applications of FRFT to following fields: communication, encryption, optimal engineering, radiology, remote sensing, fractional calculus, fractional wavelet transform, pseudo-differential operator, pattern recognition, and image processing. It is hoped that this survey would be beneficial for the researchers studying on FRFT.
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Content available SYBR Green-based real-time polymerase chain reaction assay for detection of porcine parvovirus 6 in pigs
57%
Sun P. , Bai C. X. , Zhang D. , Wang J. , Yang K. K. , Cheng B. Z. , Li Y. D. , Wang Y. , Sun P. , Bai C. X. , Zhang D. , Wang J. , Yang K. K. , Cheng B. Z. , Li Y. D. , Wang Y.
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nr 2
8
Content available Development of a SYBR Green I real-time PCR assay for detection of novel porcine parvovirus 7
51%
Li Y. D. , Yu Z. D. , Bai C. X. , Zhang D. , Sun P. , Peng M. L. , Liu H. , Wang J. , Wang Y.
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nr 1
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