41,133 research outputs found
Polycyclic polyprenylated acylphloroglucinol derivatives from Hypericum pseudohenryi
No full textSun, Haoran, Wang, Jiajia, Zhen, Bo, Wang, Xue, Suo, Xinyue, Lin, Mingbao, Jiang, Jiandong, Ji, Tengfei (2021): Polycyclic polyprenylated acylphloroglucinol derivatives from Hypericum pseudohenryi. Phytochemistry (112761) 187: 1-8, DOI: 10.1016/j.phytochem.2021.112761, URL: http://dx.doi.org/10.1016/j.phytochem.2021.11276
Fig. 4. 1H–1H in Polycyclic polyprenylated acylphloroglucinol derivatives from Hypericum pseudohenryi
No full textFig. 4. 1H–1H COSY, Key HMBC and NOE correlations of 3.Published as part of Sun, Haoran, Wang, Jiajia, Zhen, Bo, Wang, Xue, Suo, Xinyue, Lin, Mingbao, Jiang, Jiandong & Ji, Tengfei, 2021, Polycyclic polyprenylated acylphloroglucinol derivatives from Hypericum pseudohenryi, pp. 1-8 in Phytochemistry (112761) 187 on page 3, DOI: 10.1016/j.phytochem.2021.112761, http://zenodo.org/record/825900
Fig. 5 in Polycyclic polyprenylated acylphloroglucinol derivatives from Hypericum pseudohenryi
No full textFig. 5. Calculated ECD spectra of 1 and 3.Published as part of Sun, Haoran, Wang, Jiajia, Zhen, Bo, Wang, Xue, Suo, Xinyue, Lin, Mingbao, Jiang, Jiandong & Ji, Tengfei, 2021, Polycyclic polyprenylated acylphloroglucinol derivatives from Hypericum pseudohenryi, pp. 1-8 in Phytochemistry (112761) 187 on page 4, DOI: 10.1016/j.phytochem.2021.112761, http://zenodo.org/record/825900
Fig. 2. 1H–1H in Polycyclic polyprenylated acylphloroglucinol derivatives from Hypericum pseudohenryi
No full textFig. 2. 1H–1H COSY, Key HMBC and NOE correlations of 1.Published as part of Sun, Haoran, Wang, Jiajia, Zhen, Bo, Wang, Xue, Suo, Xinyue, Lin, Mingbao, Jiang, Jiandong & Ji, Tengfei, 2021, Polycyclic polyprenylated acylphloroglucinol derivatives from Hypericum pseudohenryi, pp. 1-8 in Phytochemistry (112761) 187 on page 2, DOI: 10.1016/j.phytochem.2021.112761, http://zenodo.org/record/825900
A Study of the Classical Landscape at the Wang River Villa of Wang Wei
No full textThe landscape of Wang Wei's Wang River Villa is examined by reviewing the essays and papers written about the poetical collaboration, the “Wang River Collection.” The purpose of this paper is to clarify the meaning of villa architecture in China. The author expects that this research will contribute to a mutual understanding between cultures. The villa was a Utopia for Wang. On the other hand, he was a pious Buddhist and Buddhistic concepts are reflected in the landscape. I consider the features of the classical landscape of Xie Lingyun and "Chu Ci," as written in “The Collection,” a reflection of the Buddhistic concept. When considering what the classics meant to Wang Wei, it is apparent that his villa is a representation of the classical landscape. It is not an imitation of the classical landscape, but a unique and original creation of art by Wang.departmental bulletin pape
First person – Yihua Wang
No full textFirst Person is a series of interviews with the first authors of a selection of papers published in Journal of Cell Science, helping early-career researchers promote themselves alongside their papers. Yihua Wang is the first author on ‘Nuclear entry and export of FIH are mediated by HIF1α and exportin1, respectively’, published in Journal of Cell Science. Yihua is a Lecturer in Biological Sciences at the University of Southampton, studying cell signalling in lung fibrosis and cancer, drug target validation and gene function analysis
On the formulation of the planar ANCF triangular finite elements
No full textIn this paper, new planar isoparametric triangular finite elements (FE) based on the absolute nodal coordinate formulation (ANCF) are developed. The proposed ANCF elements have six coordinates per node: two position coordinates that define the absolute position vector of the node and four gradient coordinates that define vectors tangent to coordinate lines (parameters) at the same node. To shed light on the importance of the element geometry and to facilitate the development of some of the new elements presented in this paper, two different parametric definitions of the gradient vectors are used. The first parametrization, called area parameterization, is based on coordinate lines along the sides of the element in the reference configuration, while the second parameterization, called Cartesian parameterization, employs coordinate lines defined along the axes of the structure (body) coordinate system. The fundamental differences between the ANCF parameterizations used in this investigation and the parametrizations used for conventional finite elements are highlighted. The Cartesian parameterization serves as a unique standard for the triangular FE assembly. To this end, a transformation matrix that defines the relationship between the area and the Cartesian parameterizations is introduced for each element in order to allow for the use of standard FE assembly procedure and define the structure (body) inertia and elastic forces. Using Bezier geometry and a linear mapping, cubic displacement fields of the new ANCF triangular elements are systematically developed. Specifically, two new ANCF triangular finite elements are developed in this investigation, namely four-node mixed-coordinate and three-node ANCF triangles. The performance of the proposed new ANCF elements is evaluated by comparison with the conventional linear and quadratic triangular elements as well as previously developed ANCF rectangular and triangular elements. The results obtained in this investigation show that in the case of small and large deformations as well as finite rotations, all the elements considered can produce correct results, which are in a good agreement if appropriate mesh sizes are used
Development of ANCF tetrahedral finite elements for the nonlinear dynamics of flexible structures
No full textIn this paper, methods for developing isoparametric tetrahedral finite elements (FE) based on the absolute nodal coordinate formulation (ANCF) are presented. The proposed ANCF tetrahedral elements have twelve coordinates per node that include three position and nine gradient coordinates. The fundamental differences between the coordinate parametrizations used for conventional finite elements and the coordinate parametrizations employed for the proposed ANCF tetrahedral elements are discussed. Two different parametric definitions are introduced: a volume parametrization based on coordinate lines along the sides of the tetrahedral element in the straight (undeformed) configuration and a Cartesian parametrization based on coordinate lines directed along the global axes. The volume parametrization facilitates the development of a concise set of shape functions in a closed form, and the Cartesian parametrization serves as a unique standard for the element assembly. A linear mapping based on the Bezier geometry is used to systematically define the cubic position fields of ANCF tetrahedral elements: the complete polynomial-based eight-node mixed-coordinate and the incomplete polynomial-based four-node ANCF tetrahedral elements. An element transformation matrix that defines the relationship between the volume and Cartesian parametrizations is developed and used to convert the parametric gradients to structure gradients, thereby allowing for the use of a standard FE assembly procedure. A general computational approach is employed to formulate the generalized inertia, external, and elastic forces. The performance of the proposed ANCF tetrahedral elements is evaluated by comparison with the conventional linear and quadratic tetrahedral elements and also with the ANCF brick element. In the case of small deformations, the numerical results obtained show that all the tetrahedral elements considered can correctly produce rigid body motion. In the case of large deformations, on the other hand, the solutions of all the elements considered are in good agreement, provided that appropriate mesh sizes are used
Figure 5 in Electraesalopsis beuteli gen. & sp. nov., the first lucanid beetle from the Cretaceous Burmese amber (Coleoptera: Scarabaeoidea)
No full textFigure 5. Electraesalopsis beuteli Bai, Zhang & Qiu, gen. & sp. nov., Holotype, registration No. BU-001838, complete view of the amber piece. Scale bars = 5.0 mm.Published as part of Qiu, Tengfei, Lu, Yuanyuan, Zhang, Weiwei, Wang, Shuo, Yang, Yuxia & Bai, Ming, 2017, Electraesalopsis beuteli gen. & sp. nov., the first lucanid beetle from the Cretaceous Burmese amber (Coleoptera: Scarabaeoidea), pp. 390-394 in Zoological Systematics 42 (3) on page 393, DOI: 10.11865/zs.201717, http://zenodo.org/record/461703
Analytical study and control of high-speed vehicle hunting stability with traction/braking torque
No full textThe lateral dynamics of railway vehicles are significantly influenced by traction and braking forces, primarily due to the saturation effects inherent in wheel-rail creep. This study establishes a dynamic modelling approach for railway wheelsets subject to traction and braking torques. It unravels the impacts of these forces on the stability of lateral oscillations, commonly known as hunting stability. An analytical method is employed to investigate the influence of traction and braking torque on the critical velocity required to maintain the stability of hunting motion. The results demonstrate the beneficial effects of traction and braking torque in enhancing hunting stability. Subsequently, an innovative strategy is proposed for maintaining the stability of hunting motion in high-speed vehicles. This involves applying traction and braking torque separately to the front and rear wheelsets of each bogie. The proposed method is then applied to a high-speed vehicle experiencing strong lateral vibrations under unstable conditions. The findings affirm the efficacy and safety of controlling hunting stability through interventions of traction and braking forces. This approach proves effective in mitigating abnormal vibrations arising from hunting instability in high-speed vehicles
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