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  • 1
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    A new genus from Vietnam (Hymenoptera, Braconidae, Opiinae), and the description of two new species (2018)
    In:  Various articles (1313-2970) vol.66 (2018) p.1
    Details
    Publication Date: 2019-02-27
    Description: Two aberrant species of Opiinae are described and illustrated from Vietnam, of which one is included into a new genus (Canalopius gen. n.; type species: C. periscopus sp. n.). The other species, Xynobius chrysops sp. n. belongs to an aberrant group of species near X. maculipennis (Enderlein, 1912).
    Keywords: Braconidae ; Opiinae ; Canalopius ; Xynobius ; new genus ; new species ; Oriental ; Vietnam
    Repository Name: National Museum of Natural History, Netherlands
    Type: Article / Letter to the editor
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  • 2
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    Review of the genus Craspedolcus Enderlein sensu lato in China, with the description of a new genus and four new species (Hymenoptera, Braconidae, Braconinae) (2017)
    In:  Various articles (1313-2970) vol.647 (2017) p.37
    Details
    Publication Date: 2018-02-08
    Description: A new genus is split off the genus Craspedolcus Enderlein, 1920 (Hymenoptera, Braconidae, Braconinae): Maculibracon gen. n. with type species Maculibracon abruptus sp. n. The genus Craspedolcus Enderlein sensu stricto is redefined, a key to both genera and to their species in China, Thailand and Vietnam is included. Craspedolcus obscuriventris Enderlein, 1920, (syn. n.) is a new synonym of C. vagatus (Smith, 1858), as Ipobracon maculicosta Enderlein, 1920 and Iphiaulax bhotanensis Cameron, 1907 of Maculibracon simlaensis (Cameron, 1899), comb. n. The genus Craspedolcus is recorded from China for the first time with two species: Craspedolcus fraternus Enderlein, 1920, and C. politus sp. n. The genus Maculibracon is represented by three species in China: M. simlaensis (Cameron, 1899), comb. n. (also present in Vietnam), M. hei sp. n. and M. luteonervis sp. n. and a fourth species is described from Thailand: M. abruptus sp. n. Hybogaster zebripterae Wang & Chen, 2008, from China (Fujian) is transferred to Iphiaulax Foerster, 1863, (comb. n.) and the following names are new combinations in Maculibracon gen. n.: Bracon lepcha Cameron, 1899; B. phaedo Cameron, 1899; B. simlaensis Cameron, 1899; Iphiaulax bhotanensis Cameron, 1907; I. laertius Cameron, 1903; I. leptopterus Cameron, 1903; I. lineaticarinatus Cameron, 1907; Ipobracon lissotomus Roman, 1914; I. maculicosta Enderlein, 1920 and I. pallidicornis Roman, 1914. Craspedolcus montezuma (Cameron, 1887) is provisionally transferred to the genus Digonogastra Viereck, 1912.
    Keywords: Hymenoptera ; Braconidae ; Braconinae ; Craspedolcus ; Maculibracon ; new genus ; new species ; Oriental ; China ; Thailand ; Vietnam
    Repository Name: National Museum of Natural History, Netherlands
    Type: Article / Letter to the editor
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  • 3
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    Siniphanerotomella gen. nov., a new genus of the subfamily Cheloninae Nees (Hymenoptera: Braconidae) from China (1994)
    In:  Zoologische Mededelingen vol. 68 no. 17, pp. 191-195
    Details
    Publication Date: 2024-01-12
    Description: Siniphanerotomella fanjingshana gen. nov. & spec. nov. of the tribe Phanerotomini Baker (Braconidae: Cheloninae) is described from China.
    Keywords: Braconidae ; Chelininae ; Phanerotomini ; Siniphanerotomella ; new genus ; new species ; China
    Repository Name: National Museum of Natural History, Netherlands
    Type: info:eu-repo/semantics/article
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  • 4
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    A new genus from Vietnam (Hymenoptera, Braconidae, Opiinae), and the description of two new species (2018)
    In:  Journal of Hymenoptera Research vol. 66, pp. 1-13
    Details
    Publication Date: 2024-01-12
    Description: Two aberrant species of Opiinae are described and illustrated from Vietnam, of which one is included into a new genus (Canalopius gen. n.; type species: C. periscopus sp. n.). The other species, Xynobius chrysops sp. n. belongs to an aberrant group of species near X. maculipennis (Enderlein, 1912).
    Keywords: Braconidae ; Opiinae ; Canalopius ; Xynobius ; new genus ; new species ; Oriental ; Vietnam
    Repository Name: National Museum of Natural History, Netherlands
    Type: info:eu-repo/semantics/article
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  • 5
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    Revision of the subfamily Euphorinae (excluding the tribe Meteorini Cresson) (Hymenoptera: Braconidae) from China (1997)
    In:  Zoologische Verhandelingen vol. 313 no. 1, pp. 1-217
    Details
    Publication Date: 2024-01-12
    Description: The subfamily Euphorinae (excluding the tribe Meteorini Cresson) (Hymenoptera: Braconidae) from China is revised. In total 150 species, belonging to 24 genera, are treated and keyed. One genus (Heia gen. nov.; type species: Heia robustipes spec. nov.) and 69 species are described as new to science.\nSeven genera and 16 species are new to the fauna of China. Three genera (Euphorus Nees, 1834, Leiophron Nees, 1818, and Peristenus Foerster, 1862) are redefined. The subgeneric division of the genus Streblocera Westwood is reassessed and one new subgenus (Villocera subgen. nov.; type species: Streblocera villosa Papp, 1985) is proposed. The following synonyms are established: Euphoriella Ashmead, 1900, with Leiophron Nees, 1818; Aridelus hunanensis You, Xiong & Zhou, 1988, with A. rutilipes Papp, 1965; Aridelus destitutes Chou, 1987, with A. nigricans Chao, 1974; Streblocera guizhouensis You & Lou, 1993, with S. villosa Papp, 1985; Bracteodes ceranae You & Zhou, 1991, with Syntretomorpha szaboi Papp, 1962 and Wesmaelia pendula Foerster, 1862, with Euphorus petiolatus Wollaston, 1850. The following new names are proposed: Streblocera chaoi nom. nov. for S. serrata Chao, 1993 and Myiocephalini nom. nov. for Loxocephalini Shaw, 1985. Wesmaelia petiolata (Wollaston, 1850) is a new combination.\nAn aberrant species of the tribe Meteorini (Meteorus erratus spec. nov.) is included, because of its similarity to some members of the tribe Perilitini Foerster, 1862.
    Keywords: Braconidae ; Euphorinae ; Palaearctic ; Oriental ; new genus ; new species ; China.
    Repository Name: National Museum of Natural History, Netherlands
    Type: info:eu-repo/semantics/article
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  • 6
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    Unknown
    Review of the genus Craspedolcus Enderlein sensu lato in China, with the description of a new genus and four new species (Hymenoptera, Braconidae, Braconinae) (2017)
    In:  ZooKeys vol. 647, pp. 37-65
    Details
    Publication Date: 2024-01-12
    Description: A new genus is split off the genus Craspedolcus Enderlein, 1920 (Hymenoptera, Braconidae, Braconinae): Maculibracon gen. n. with type species Maculibracon abruptus sp. n. The genus Craspedolcus Enderlein sensu stricto is redefined, a key to both genera and to their species in China, Thailand and Vietnam is included. Craspedolcus obscuriventris Enderlein, 1920, (syn. n.) is a new synonym of C. vagatus (Smith, 1858), as Ipobracon maculicosta Enderlein, 1920 and Iphiaulax bhotanensis Cameron, 1907 of Maculibracon simlaensis (Cameron, 1899), comb. n. The genus Craspedolcus is recorded from China for the first time with two species: Craspedolcus fraternus Enderlein, 1920, and C. politus sp. n. The genus Maculibracon is represented by three species in China: M. simlaensis (Cameron, 1899), comb. n. (also present in Vietnam), M. hei sp. n. and M. luteonervis sp. n. and a fourth species is described from Thailand: M. abruptus sp. n. Hybogaster zebripterae Wang & Chen, 2008, from China (Fujian) is transferred to Iphiaulax Foerster, 1863, (comb. n.) and the following names are new combinations in Maculibracon gen. n.: Bracon lepcha Cameron, 1899; B. phaedo Cameron, 1899; B. simlaensis Cameron, 1899; Iphiaulax bhotanensis Cameron, 1907; I. laertius Cameron, 1903; I. leptopterus Cameron, 1903; I. lineaticarinatus Cameron, 1907; Ipobracon lissotomus Roman, 1914; I. maculicosta Enderlein, 1920 and I. pallidicornis Roman, 1914. Craspedolcus montezuma (Cameron, 1887) is provisionally transferred to the genus Digonogastra Viereck, 1912.
    Keywords: Hymenoptera ; Braconidae ; Braconinae ; Craspedolcus ; Maculibracon ; new genus ; new species ; Oriental ; China ; Thailand ; Vietnam
    Repository Name: National Museum of Natural History, Netherlands
    Type: info:eu-repo/semantics/article
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  • 7
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    Simultaneous denoising and reconstruction of 5-D seismic data via damped rank-reduction method (2016)
    Oxford University Press
    Details
    Publication Date: 2016-07-20
    Description: The Cadzow rank-reduction method can be effectively utilized in simultaneously denoising and reconstructing 5-D seismic data that depend on four spatial dimensions. The classic version of Cadzow rank-reduction method arranges the 4-D spatial data into a level-four block Hankel/Toeplitz matrix and then applies truncated singular value decomposition (TSVD) for rank reduction. When the observed data are extremely noisy, which is often the feature of real seismic data, traditional TSVD cannot be adequate for attenuating the noise and reconstructing the signals. The reconstructed data tend to contain a significant amount of residual noise using the traditional TSVD method, which can be explained by the fact that the reconstructed data space is a mixture of both signal subspace and noise subspace. In order to better decompose the block Hankel matrix into signal and noise components, we introduced a damping operator into the traditional TSVD formula, which we call the damped rank-reduction method. The damped rank-reduction method can obtain a perfect reconstruction performance even when the observed data have extremely low signal-to-noise ratio. The feasibility of the improved 5-D seismic data reconstruction method was validated via both 5-D synthetic and field data examples. We presented comprehensive analysis of the data examples and obtained valuable experience and guidelines in better utilizing the proposed method in practice. Since the proposed method is convenient to implement and can achieve immediate improvement, we suggest its wide application in the industry.
    Keywords: Seismology
    Print ISSN: 0956-540X
    Electronic ISSN: 1365-246X
    Topics: Geosciences
    Published by Oxford University Press on behalf of The Deutsche Geophysikalische Gesellschaft (DGG) and the Royal Astronomical Society (RAS).
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  • 8
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    Stable, accurate and efficient computation of normal modes for horizontal stratified models (2016)
    Oxford University Press
    Details
    Publication Date: 2016-07-03
    Description: We propose an adaptive root-determining strategy that is very useful when dealing with trapped modes or Stoneley modes whose energies become very insignificant on the free surface in the presence of low-velocity layers or fluid layers in the model. Loss of modes in these cases or inaccuracy in the calculation of these modes may then be easily avoided. Built upon the generalized reflection/transmission coefficients, the concept of ‘family of secular functions’ that we herein call ‘adaptive mode observers’ is thus naturally introduced to implement this strategy, the underlying idea of which has been distinctly noted for the first time and may be generalized to other applications such as free oscillations or applied to other methods in use when these cases are encountered. Additionally, we have made further improvements upon the generalized reflection/transmission coefficient method; mode observers associated with only the free surface and low-velocity layers (and the fluid/solid interface if the model contains fluid layers) are adequate to guarantee no loss and high precision at the same time of any physically existent modes without excessive calculations. Finally, the conventional definition of the fundamental mode is reconsidered, which is entailed in the cases under study. Some computational aspects are remarked on. With the additional help afforded by our superior root-searching scheme and the possibility of speeding calculation using a less number of layers aided by the concept of ‘turning point’, our algorithm is remarkably efficient as well as stable and accurate and can be used as a powerful tool for widely related applications.
    Keywords: Seismology
    Print ISSN: 0956-540X
    Electronic ISSN: 1365-246X
    Topics: Geosciences
    Published by Oxford University Press on behalf of The Deutsche Geophysikalische Gesellschaft (DGG) and the Royal Astronomical Society (RAS).
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  • 9
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    Complex frequency-shifted multi-axial perfectly matched layer for elastic wave modelling on curvilinear grids (2014)
    Oxford University Press
    Details
    Publication Date: 2014-06-21
    Description: Perfectly matched layer (PML) is an efficient absorbing technique for numerical wave simulations. Since it appeared, various improvements have been made. The complex frequency-shifted PML (CFS-PML) improves the absorbing performance for near-grazing incident waves and evanescent waves. The auxiliary differential equation (ADE) formulation of the PML provides a convenient unsplit-field PML implementation that can be directly used with high order time marching schemes. The multi-axial PML (MPML) stabilizes the PML on anisotropic media. However, these improvements were generally developed for Cartesian grids. In this paper, we extend the ADE CFS-PML to general curvilinear (non-orthogonal) grids for elastic wave modelling. Unlike the common implementations to absorb the waves in the computational space, we apply the damping along the perpendicular direction of the PML layer in the local Cartesian coordinates. Further, we relate the perpendicular and parallel components of the gradient operator in the local Cartesian coordinates to the derivatives in the curvilinear coordinates, to avoid mapping the wavefield to the local Cartesian coordinates. It is thus easy to be incorporated with numerical schemes on curvilinear grids. We derive the PML equations for the interior region and for the free surface separately because the free surface boundary condition modifies the elastic wave equations. We show that the elastic wave modelling on curvilinear grids exhibits anisotropic effects in the computational space, which may lead to unstable simulations. To stabilize the simulation, we adapt the MPML strategy to also absorb the wavefield along the two parallel directions of the PML. We illustrate the stability of this ADE CFS-MPML for finite-difference elastic wave simulations on curvilinear grids by two numerical experiments.
    Keywords: Seismology
    Print ISSN: 0956-540X
    Electronic ISSN: 1365-246X
    Topics: Geosciences
    Published by Oxford University Press on behalf of The Deutsche Geophysikalische Gesellschaft (DGG) and the Royal Astronomical Society (RAS).
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  • 10
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    Three-dimensional curved grid finite-difference modelling for non-planar rupture dynamics (2014)
    Oxford University Press
    Details
    Publication Date: 2014-09-07
    Description: In this study, we present a new method for simulating the 3-D dynamic rupture process occurring on a non-planar fault. The method is based on the curved-grid finite-difference method (CG-FDM) proposed by Zhang & Chen and Zhang et al. to simulate the propagation of seismic waves in media with arbitrary irregular surface topography. While keeping the advantages of conventional FDM, that is computational efficiency and easy implementation, the CG-FDM also is flexible in modelling the complex fault model by using general curvilinear grids, and thus is able to model the rupture dynamics of a fault with complex geometry, such as oblique dipping fault, non-planar fault, fault with step-over, fault branching, even if irregular topography exists. The accuracy and robustness of this new method have been validated by comparing with the previous results of Day et al. , and benchmarks for rupture dynamics simulations. Finally, two simulations of rupture dynamics with complex fault geometry, that is a non-planar fault and a fault rupturing a free surface with topography, are presented. A very interesting phenomenon was observed that topography can weaken the tendency for supershear transition to occur when rupture breaks out at a free surface. Undoubtedly, this new method provides an effective, at least an alternative, tool to simulate the rupture dynamics of a complex non-planar fault, and can be applied to model the rupture dynamics of a real earthquake with complex geometry.
    Keywords: Seismology
    Print ISSN: 0956-540X
    Electronic ISSN: 1365-246X
    Topics: Geosciences
    Published by Oxford University Press on behalf of The Deutsche Geophysikalische Gesellschaft (DGG) and the Royal Astronomical Society (RAS).
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