Pd nanoparticles supported on N-doped porous carbons derived from ZIF-67: Enhanced catalytic performance in phenol hydrogenation

Shuaishuai Ding,Chunhua Zhang,Yefei Liu,Hong Jiang,Weihong Xing,Rizhi Chen 한국공업화학회 2017 Journal of Industrial and Engineering Chemistry Vol.46 No.-

We reported a Pd@CN catalyst made of Pd nanoparticles supported on a N-doped carbon derived fromZIF-67. The CN materials with micro/mesoporous structures were well developed for the loading of Pdnanoparticles and improving the catalytic performances. With the increase of calcination temperature ofZIF-67, the BET surface of CN materials initially increased and then reduced. Moreover, the highercalcination temperature would lead to lower nitrogen content in CN materials, causing lower selectivityof phenol hydrogenation to cyclohexanone. Our Pd@CN600 catalyst achieved a conversion of ca. 95% and aselectivity of ca. 95%, and exhibited excellent stability during recycling experiments

Effects of gear modifications on the dynamic characteristics of wind turbine gearbox considering elastic support of the gearbox

Shuaishuai Wang,Caichao Zhu,Chaosheng Song,Huachao Liu,Jianjun Tan,Houyi Bai 대한기계학회 2017 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.31 No.3

The reliability and service life of wind turbines are directly influenced by the dynamic performance of the gearbox under the timevarying wind loads. The control of vibration behavior is essential for the achievement of a 20-year service life. We developed a rigidflexible coupled dynamic model for a wind turbine gearbox. The planet carrier, the housing, and the bedplate are modelled as flexibilities while other components are assumed as rigid bodies. The actual three points elastic supporting are considered and a strip based mesh model is used to represent the engagement of the gear pairs. The effects of gear tooth modifications on the dynamics were investigated. Finally, we conducted a dynamic test for the wind turbine gearbox in the wind field. Results showed that the contact characteristics of gear pairs were improved significantly; the peak-to-peak value of transmission error of each gear pair was reduced; the amplitudes of the vibration acceleration and the structural noise of the wind turbine gearbox were lowered after suitable tooth modification.

太极拳馆高质量发展的双元平衡路径

刘硕(Shuo Liu),李爱增(Aizeng Li),张帅帅(Shuaishuai Zhang) YIXIN 출판사 2023 Journal of Humanities and Social Sciences Vol.1 No.2

作为体育场馆的重要组成部分以及构建更高水平的全民健身公共服务体系重要推动力,太极拳馆应紧跟时代步伐,走向高质量发展的道路。本文在太极拳馆高质量发展的机会和困境分析之后,提出以双元平衡为理论基础的经济效益与社会效益双元平衡的发展路径。 As an important component of sports venues and an important driving force for building a higher-level public service system for national fitness, Tai Chi gymnasium should keep up with the pace of the times and move towards high-quality development. After analyzing the opportunities and difficulties of high-quality development of Tai Chi Gymnasium, this article proposes a development path based on the dual balance of economic and social benefits.

A Real-time Positioning Model for UAV’s Patrolling Images Based on Airborne LiDAR Point Cloud Fusion

Wei Fan,Haojie Liu,Haoyang Pei,Shuaishuai Tian,Yun Liu 대한토목학회 2024 KSCE Journal of Civil Engineering Vol.28 No.7

The precise positioning issue of oblique aerial image has been widely studied in recent years. However, there are still some deficiencies in applying the existing methods to highly time-sensitive engineering. For the real-time positioning issues of oblique images involved in Unmanned Aerial Vehicle’s (UAV’s) patrolling applications, existing photogrammetry method cannot meet the real-time positioning requirements, existing binocular vision method cannot meet the dynamic and precise positioning requirements, existing optical flow method cannot meet the absolute positioning requirements, and existing multi-source feature matching method cannot meet the robust positioning requirements. In order to meet the real-time, dynamic, precise, absolute and robust positioning requirements of UAV’s patrolling images, a real-time positioning model for UAV’s patrolling images based on airborne LiDAR point cloud fusion is proposed. First, a precise Digital Surface Model (DSM) is generated by rasterizing and imaging the raw airborne LiDAR point cloud, in which a pixel’s grayscale is exactly equal to elevation of local area covered by the pixel. Second, the generated DSM and UAV’s patrolling image are fused under specific geometric constrains, so as to realize real-time positioning of UAV’s patrolling image pixel by pixel. Finally, more precise positioning of selected key points on UAV’s patrolling image can be realized by performing Principal Component Analysis (PCA)on the raw airborne LiDAR point cloud that surrounds the selected key points. The above methods are analyzed and verified by three groups of practical experiments, and results indicate that the proposed model can achieve real-time positioning of a single UAV’s patrolling image (4000 × 6000 pixels) with an accuracy of 0.5 m within 0.38 seconds in arbitrary areas, and can further realize precise positioning of any selected key point on UAV’s patrolling image with an accuracy of 0.2 m in 0.001 seconds.

Design and Analysis of Additive Manufactured Flexure Hinge with Large Stroke and High Accuracy

Guoming Yao,Peng-Bo Liu,Shuaishuai Lu,Peng Yan 한국정밀공학회 2022 International Journal of Precision Engineering and Vol.23 No.7

Additive manufacturing technology has significant potential for the development of advanced compliant mechanisms for precision manipulations owing to the advantage of realizing complex monolithic structures. By overcoming the limitations of traditional manufacturing technologies, this study develops a novel spatial spiral-based flexure hinge that aims to have a large stroke and high accuracy. In particular, the ∞-shaped configuration was adopted along the width direction of the flexure hinge by adjusting the spiral diameters. Owing to the excellent deformation capability and geometric constraints of the spatial spiral structure, the developed flexure hinge is capable of deflecting up to 90° with a small axis drift. The stiff - ness model of the flexure hinge was derived based on the elastic beam theory to illustrate the load–deflection relationships. The characteristics of the flexure hinge were further verified by finite element simulations and experiments on an additive manufactured prototype. Compared with the traditional flexure hinge, the developed design demonstrates a higher range and accuracy of rotation and a better ability to preserve the rotation center position but smaller compliance, which demonstrates a significant potential for emerging applications, including optical adjustments, biomedical operations, and robot joints.

Population genetic structure and phylogenetic analysis of gray’s pipefish, Halicampus grayi in the South China Sea

Yingying Wu,Xin Wang,Shuaishuai Liu,Hao Luo,Qiang Lin 한국유전학회 2020 Genes & Genomics Vol.42 No.2

Background The evolution of male pregnancy is the most distinctive characteristic of syngnathids, and they were recognized as flagship species for marine conservation. Genus Halicampus is an important branch of syngnathid fishes that has not received the attention it deserves. Objective To sequence the mitochondrial genome of Halicampus grayi, and investage the genetic structure of its populations. Methods Degenerate primers were designed to amplify the entire mitochondrial genome of H. grayi. The phylogenetic relationship between H. grayi and other syngnathids were conducted using maximum-likelihood method. Population genetic structure of three geographic population of H. grayi were determined using median-joining haplotype network based on COI and Cytb sequences. Results The complete mitochondrial genome of Halicampus grayi was assembled into a 17,059 bp circular sequence, which contains 13 protein-coding genes, 2 rRNA genes, 22 tRNA genes and 1 D-loop region. The overall base composition of H. grayi is 29.93% A, 29.31% T, 16.23% G and 24.54% C, with a slight A + T rich feature (59.24%). Phylogenetic analysis indicated that H. grayi has a close relationship with Trachyrhamphus serratus. Population genetic analysis revealed a relatively high genetic diversity across different geographic populations of H. grayi, and the results of median-joining haplotype network indicated a lack of structure in populations of H. grayi. Conclusion The mitogenome of H. grayi will provided important information about the origin and evolution issues of syngnathid fishes, and the high-level genetic diversity detected in their populations will provide insight into the gene flow pattern of marine fishes.

Assessment of the relative tectonic activity of the Longxian–Baoji Fault Zone in the northeastern Tibetan Plateau based on geomorphic indices

Qi Huang,Xiaohu Zhou,Jiyuan You,Shuaishuai Xu,Lushan Liu,Yang Wang 한국지질과학협의회 2023 Geosciences Journal Vol.27 No.6

Since the Late Cenozoic, tectonic deformation has been intense in the Longxian–Baoji Fault Zone (LBFZ), which is at the intersection of the southwest margin of the Ordos Block, the northeast margin of the Tibet Plateau, and the Qinling Orogenic Belt. To evaluate the relative tectonic activity within the LBFZ and discuss the influence of the northeastward expansion of the Tibetan Plateau on the geomorphological evolution of the LBFZ, we extracted data of the Qianhe, Hengshuihe, and Jinlinghe River Basins from the ASTER GDEM and analyzed the geomorphic indices, including the hypsometric integral (HI), standardized stream length-gradient index (SL/K) and Hack profile, elongation ratio (Re), the drainage basin asymmetry factor (AF) and valley floor width-to-height ratio (VF). Through geomorphic indices and field investigations, we found that the LBFZ has experienced relatively high tectonic activity. Combined with the index of relative active tectonics (IAT), we compared the tectonic activity strengths of the four major faults in the study area. Among them, the tectonic activities of the Longxian-Qishan Fault (LQF) and the Taoyuan-Guichuansi Fault (TGF) are the highest. The morphology and AF values of the drainage basin of the southwest side of the study area indicate the influence of northwest-southeast compressive stress. The northeastward expansion of the Tibetan Plateau affected the LBFZ region, and the stress brought about by it controlled the tectonic deformation in the region and sculpted the modern landscape. This study is of great significance for understanding the impact of the northeastward expansion of the Tibetan Plateau on the geomorphological evolution of the LBFZ.

Characterization and functional analysis of Krtap11-1 during hair follicle development in Angora rabbits (Oryctolagus cuniculus)

Shuang Liang,Zhiyuan Bao,Bohao Zhao,Tong Zhou,Jiali Li,Ming Liu,Shuaishuai Hu,Naisu Yang,Yang Chen,Xinsheng Wu 한국유전학회 2020 Genes & Genomics Vol.42 No.11

Background Keratin-associated protein (KAP), the structural protein molecule of hair fibers, plays a key role in determiningthe physical properties of hair. Studies of Krtap11-1 have focused only on its localization. Functional studies of Krtap11-1in hair follicle development have so far not been reported. Objective This study aimed to provide evidence for the role of Krtap11-1 in skin and hair development. Methods Full-length cloning and analysis of Krtap11-1 were conducted to ascertain its function. Overexpression vectors andinterference sequences were constructed and transfected into RAB-9 cells. Quantitative real-time polymerase chain reaction(qRT-PCR) was used to investigate the hair follicle developmental stage of Krtap11-1, the expression of different tissues,and the effects on other hair follicle development-related genes. Results The full length of cloned Krtap11-1 was 947 bp. Krtap11-1 was confirmed to be a hydrophilic protein localizedmostly in mitochondria. The greatest mRNA expression was observed in skin. Using a follicle synchronization model, itwas found that Krtap11-1 mRNA expression levels first increased then decreased over the passage of time, principally duringhair follicle catagen and telogen. Following the overexpression of Krtap11-1, mRNA expression levels of the WNT-2,KRT17, BMP-2, and TGF-β-1 genes increased, and LEF-1 decreased (P < 0.05), the converse after the corresponding useof si-RNA interference. Conclusions Krtap11-1 exerts a promoting effect. The results provide novel insight into the relationship between hair follicledevelopment and Krtap11-1 gene expression.

Facile Synthesis of CdTe Nanorods from the Growth of Te Nanorods

Xu, Weiwei,Niu, Jinzhong,Zheng, Shuang,Tian, Guimin,Wu, Xinghui,Cheng, Yongguang,Hu, Xiaoyang,Liu, Shuaishuai,Hao, Haoshan Korean Chemical Society 2017 대한화학회지 Vol.61 No.4

One-dimensional CdTe nanorods (NRs) are obtained by the reaction of various Cd precursors with single crystalline Te nanorod templates, which are pre-synthesized from Te precursors by a simple and reproducible solvothermal method. Throughout the process, the diffraction intensity of different crystal facets of single crystalline Te NRs varied with reaction times. Finally, by alloying Cd ions along the axial direction of Te NRs, polycrystalline cubic phase CdTe NRs with diameters of 80-150 nm and length up to $1.2-2.4{\mu}m$ are obtained. The nucleation and growth processes of Te and CdTe NRs are discussed in details, and their properties are characterized by XRD, SEM, TEM, Raman scattering, and UV-vis absorption spectra. It was found that the key elements of synthesizing CdTe NRs such as reaction temperatures and Cd sources will strongly influence the final shape of CdTe NRs.