The Experts below are selected from a list of 2124 Experts worldwide ranked by ideXlab platform

Jie Xiao - One of the best experts on this subject based on the ideXlab platform.

  • The role of Circular Folds in mixing intensification in the small intestine: A numerical study
    Chemical Engineering Science, 2021
    Co-Authors: Jinping Zha, Siyu Zou, Jianyu Hao, Xinjuan Liu, Guillaume Delaplace, Romain Jeantet, Didier Dupont, Xiao Dong Chen, Jie Xiao
    Abstract:

    The inner wall of the intestine has multiscale structures whose roles, beyond the increase of surface area for absorption, are yet to be discovered. In this study, the mixing process in a human duodenum with Circular Folds, driven by segmentation contraction, was simulated using a multiphysics model, making it possible to track the evolution of mixing level distributions and enabling quantitative evaluation of the structural role of Folds in mixing intensification. It was found that, in a laminar flow regime, Circular Folds intensify both radial and axial mixing by synergistically offering prominent and long-lasting swirls/vortices, high fluid velocity and high shear rates. Tall and slim Folds with enlarged segmentation amplitude, frequency and wavelength can enhance mixing. The maximum enhancement ratio can reach 6.18 under the investigated conditions. These findings will also be valuable for the improved design of biomimetic soft-elastic reactors for the chemical and pharmaceutical industries.

Jiangping Qiu - One of the best experts on this subject based on the ideXlab platform.

  • Three new species of earthworms (Oligochaeta: Megascolecidae) from Yunnan Province, China.
    Zootaxa, 2019
    Co-Authors: Zhu Yuan, Jibao Jiang, Qi Zhao, Yan Dong, Jiangping Qiu
    Abstract:

    Earthworm specimens collected from Yunnan Province, China were found to represent three new species of Megascolecidae: Amynthas demptus sp. nov., Amynthas lacustris sp. nov. and Metaphire reclusa sp. nov. A. demptus belongs to Amynthas hawayanus-group and has three pairs of spermathecal pores in 5/6-7/8. A. lacustris belongs to Amynthas morrisi-group and has two pairs of spermathecal pores in 5/6-6/7. M. reclusa has no spermathecal pores. A. demptus has no male pores. The male pores of A. lacustris are about 1/3 body circumference ventrally apart, with a presetal and a postsetal papilla medial to each pore, surrounded with two Circular Folds. The male pores of M. reclusa are in copulatory chambers at XVIII, with openings of copulatory chambers about 1/3 body circumference ventrally apart. In this paper, the morphological characters of the three new species are described. We also sequenced COI and 12S gene fragments of the holotypes and selected paratype specimens to provide molecular data.

  • Four new earthworm species of the genus Amynthas Kinberg (Oligochaeta: Megascolecidae) from the island of Hainan and Guangdong Province, China
    Journal of Natural History, 2014
    Co-Authors: Jibao Jiang, Jing Sun, Qi Zhao, Jiangping Qiu
    Abstract:

    This paper describes four new species of morrisi-group earthworms from Hainan and Guangdong Provinces, China: Amynthas instabilis sp. nov, Amynthas dilatatus sp. nov, Amynthas infuscuatus sp. nov. and Amynthas qiongzhongensis sp. nov. All four species have two pairs of spermathecal pores in 5/6–6/7; male pores in XVIII, 0.33 circumference ventrally apart, each on the top of a slightly raised porophore, surrounded by several tiny genital papillae, in a pulvinate pad with three to six Circular Folds. Characters of the spermathecae, prostate glands and other anatomical features easily distinguish the new species from earthworms previously reported from the morrisi-group.http://zoobank.org/urn:lsid:zoobank.org:pub:545E9152-C826-44A2-949E-402434D8493D.

  • Three new species of earthworms belonging to the genus Amynthas (Oligochaeta: Megascolecidae) from Hainan Island, China
    Zootaxa, 2010
    Co-Authors: Jing Sun, Qi Zhao, Jiangping Qiu
    Abstract:

    This paper describes three new species of earthworms from Hainan Island, China: Amynthas trapezoides sp. nov., Amynthas conchipapillatus sp. nov. and Amynthas dongfangensis sp. nov. Amynthas trapezoides has no pigment, and has two pairs of spermathecal pores in 6/7 and 7/8 arranged trapezoidally near the mid-ventral line, a complicated glandular region on ventral side of 1/2XVII–1/4XIX, developed prostates and repeatedly curved prostatic ducts close to ventral midline. Amynthas conchipapillatus sp. nov. has no pigment, and has a pair of large convex smooth shellfish-like papillae in male pore region, only one pair of spermathecal pores in 5/6 and undeveloped thin prostates which closely adherent to the body wall. Amynthas dongfangensis sp. nov. has a pair of male pores on the centre of a flat-topped conical protuberance surrounded by three to five Circular Folds, and five pairs of spermathecal pores in 4/5–8/9.

Jinping Zha - One of the best experts on this subject based on the ideXlab platform.

  • The role of Circular Folds in mixing intensification in the small intestine: A numerical study
    Chemical Engineering Science, 2021
    Co-Authors: Jinping Zha, Siyu Zou, Jianyu Hao, Xinjuan Liu, Guillaume Delaplace, Romain Jeantet, Didier Dupont, Xiao Dong Chen, Jie Xiao
    Abstract:

    The inner wall of the intestine has multiscale structures whose roles, beyond the increase of surface area for absorption, are yet to be discovered. In this study, the mixing process in a human duodenum with Circular Folds, driven by segmentation contraction, was simulated using a multiphysics model, making it possible to track the evolution of mixing level distributions and enabling quantitative evaluation of the structural role of Folds in mixing intensification. It was found that, in a laminar flow regime, Circular Folds intensify both radial and axial mixing by synergistically offering prominent and long-lasting swirls/vortices, high fluid velocity and high shear rates. Tall and slim Folds with enlarged segmentation amplitude, frequency and wavelength can enhance mixing. The maximum enhancement ratio can reach 6.18 under the investigated conditions. These findings will also be valuable for the improved design of biomimetic soft-elastic reactors for the chemical and pharmaceutical industries.

Didier Dupont - One of the best experts on this subject based on the ideXlab platform.

  • The role of Circular Folds in mixing intensification in the small intestine: A numerical study
    Chemical Engineering Science, 2021
    Co-Authors: Jinping Zha, Siyu Zou, Jianyu Hao, Xinjuan Liu, Guillaume Delaplace, Romain Jeantet, Didier Dupont, Xiao Dong Chen, Jie Xiao
    Abstract:

    The inner wall of the intestine has multiscale structures whose roles, beyond the increase of surface area for absorption, are yet to be discovered. In this study, the mixing process in a human duodenum with Circular Folds, driven by segmentation contraction, was simulated using a multiphysics model, making it possible to track the evolution of mixing level distributions and enabling quantitative evaluation of the structural role of Folds in mixing intensification. It was found that, in a laminar flow regime, Circular Folds intensify both radial and axial mixing by synergistically offering prominent and long-lasting swirls/vortices, high fluid velocity and high shear rates. Tall and slim Folds with enlarged segmentation amplitude, frequency and wavelength can enhance mixing. The maximum enhancement ratio can reach 6.18 under the investigated conditions. These findings will also be valuable for the improved design of biomimetic soft-elastic reactors for the chemical and pharmaceutical industries.

Siyu Zou - One of the best experts on this subject based on the ideXlab platform.

  • The role of Circular Folds in mixing intensification in the small intestine: A numerical study
    Chemical Engineering Science, 2021
    Co-Authors: Jinping Zha, Siyu Zou, Jianyu Hao, Xinjuan Liu, Guillaume Delaplace, Romain Jeantet, Didier Dupont, Xiao Dong Chen, Jie Xiao
    Abstract:

    The inner wall of the intestine has multiscale structures whose roles, beyond the increase of surface area for absorption, are yet to be discovered. In this study, the mixing process in a human duodenum with Circular Folds, driven by segmentation contraction, was simulated using a multiphysics model, making it possible to track the evolution of mixing level distributions and enabling quantitative evaluation of the structural role of Folds in mixing intensification. It was found that, in a laminar flow regime, Circular Folds intensify both radial and axial mixing by synergistically offering prominent and long-lasting swirls/vortices, high fluid velocity and high shear rates. Tall and slim Folds with enlarged segmentation amplitude, frequency and wavelength can enhance mixing. The maximum enhancement ratio can reach 6.18 under the investigated conditions. These findings will also be valuable for the improved design of biomimetic soft-elastic reactors for the chemical and pharmaceutical industries.