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Direct pyrolysis to convert biomass to versatile 3D carbon nanotubes/mesoporous carbon architecture:

《化学科学与工程前沿(英文)》 2023年 第17卷 第6期   页码 679-690 doi: 10.1007/s11705-022-2266-8

摘要: The massive conversion of resourceful biomass to carbon nanomaterials not only opens a new avenue to effective and economical disposal of biomass, but provides a possibility to produce highly valued functionalized carbon-based electrodes for energy storage and conversion systems. In this work, biomass is applied to a facile and scalable one-step pyrolysis method to prepare three-dimensional (3D) carbon nanotubes/mesoporous carbon architecture, which uses transition metal inorganic salts and melamine as initial precursors. The role of each employed component is investigated, and the electrochemical performance of the attained product is explored. Each component and precise regulation of their dosage is proven to be the key to successful conversion of biomass to the desired carbon nanomaterials. Owing to the unique 3D architecture and integration of individual merits of carbon nanotubes and mesoporous carbon, the as-synthesized carbon nanotubes/mesoporous carbon hybrid exhibits versatile application toward lithium-ion batteries and Zn-air batteries. Apparently, a significant guidance on effective conversion of biomass to functionalized carbon nanomaterials can be shown by this work.

关键词: biomass     direct pyrolysis     3D CNTs/MC hybrid     lithium-ion batteries     Zn-air batteries    

An end-to-end 3d seismic simulation of underground structures due to point dislocation source by usingan FK-FEM hybrid approach

Zhenning BA; Jisai FU; Zhihui ZHU; Hao ZHONG

《结构与土木工程前沿(英文)》 2022年 第16卷 第12期   页码 1515-1529 doi: 10.1007/s11709-022-0887-0

摘要: Based on the domain reduction idea and artificial boundary substructure method, this paper proposes an FK-FEM hybrid approach by integrating the advantages of FK and FEM (i.e., FK can efficiently generate high-frequency three translational motion, while FEM has rich elements types and constitutive models). An advantage of this approach is that it realizes the entire process simulation from point dislocation source to underground structure. Compared with the plane wave field input method, the FK-FEM hybrid approach can reflect the spatial variability of seismic motion and the influence of source and propagation path. This approach can provide an effective solution for seismic analysis of underground structures under scenario of earthquake in regions where strong earthquakes may occur but are not recorded, especially when active faults, crustal, and soil parameters are available. Taking Daikai subway station as an example, the seismic response of the underground structure is simulated after verifying the correctness of the approach and the effects of crustal velocity structure and source parameters on the seismic response of Daikai station are discussed. In this example, the influence of velocity structure on the maximum interlayer displacement angle of underground structure is 96.5% and the change of source parameters can lead to the change of structural failure direction.

关键词: source-to-structure simulation     FK-FEM hybrid approach     underground structures     point dislocation source    

关于3D打印技术在医学模具以及再生组织和器官方面的应用综述

Kan Wang, Chia-Che Ho, Chuck Zhang, Ben Wang

《工程(英文)》 2017年 第3卷 第5期   页码 653-662 doi: 10.1016/J.ENG.2017.05.013

摘要: 随着三维(3D)打印和3D 生物打印技术的快速发展,许多研究人员已经开始使用增材制造技术来生产具有多种功能的医学模具。本文综述了3D 打印和3D 生物打印技术在制作功能性医学模具和生物结构方面的应用。特别讨论了3D 打印功能性医学模具(即组织模拟医学模具、放射性医学模具和生理医学模具)及被用于再生组织和器官的3D 生物打印模具的制备(即混合模式支架材料、可转换支架和集成传感器)工艺、发展现状以及未来发展趋势

关键词: 3D打印     3D生物打印     医学模具     再生组织/器官     支架    

Animage-based approach to the reconstruction of ancient architectures by extracting and arranging 3D

Divya Udayan J,HyungSeok KIM,Jee-In KIM

《信息与电子工程前沿(英文)》 2015年 第16卷 第1期   页码 12-27 doi: 10.1631/FITEE.1400141

摘要: The objective of this research is the rapid reconstruction of ancient buildings of historical importance using a single image. The key idea of our approach is to reduce the infinite solutions that might otherwise arise when recovering a 3D geometry from 2D photographs. The main outcome of our research shows that the proposed methodology can be used to reconstruct ancient monuments for use as proxies for digital effects in applications such as tourism, games, and entertainment, which do not require very accurate modeling. In this article, we consider the reconstruction of ancient Mughal architecture including the Taj Mahal. We propose a modeling pipeline that makes an easy reconstruction possible using a single photograph taken from a single view, without the need to create complex point clouds from multiple images or the use of laser scanners. First, an initial model is automatically reconstructed using locally fitted planar primitives along with their boundary polygons and the adjacency relation among parts of the polygons. This approach is faster and more accurate than creating a model from scratch because the initial reconstruction phase provides a set of structural information together with the adjacency relation, which makes it possible to estimate the approximate depth of the entire structural monument. Next, we use manual extrapolation and editing techniques with modeling software to assemble and adjust different 3D components of the model. Thus, this research opens up the opportunity for the present generation to experience remote sites of architectural and cultural importance through virtual worlds and real-time mobile applications. Variations of a recreated 3D monument to represent an amalgam of various cultures are targeted for future work.

关键词: Digital reconstruction     3D virtual world     3D spatial components     Vision and scene understanding    

增材制造(3D打印)发展趋势 Perspective

卢秉恒, 李涤尘, 田小永

《工程(英文)》 2015年 第1卷 第1期   页码 85-89 doi: 10.15302/J-ENG-2015012

摘要:

增材制造又称为3D打印,在过去30年间取得了快速发展并展示出前所未有的发展潜力。同时,这项发展潜力巨大的技术对传统工业也产生了不可估量的影响。3D打印技术将会推动生产模式的变革,通过实现5个“任意”的工艺发展,将会为制造行业带来一个以定制化制造为特征的新时代。3D打印的技术进步及其与传统制造工艺的融合,将推动制造业在材料研发、产品设计、生产工艺等方面进一步创新发展。最终,3D打印技术将与等材制造、减材制造形成三足鼎立局面,共同分享整个社会的制造业价值。

关键词: 增材制造     3D打印     制造模式     定制化制造     创新设计    

3D打印技术在多个领域取得进展

Chris Palmer

《工程(英文)》 2020年 第6卷 第6期   页码 590-592 doi: 10.1016/j.eng.2020.04.005

Construction of digital 3D magic-cube organization structure for innovation-driven manufacturing

《工程管理前沿(英文)》 2023年 第10卷 第3期   页码 373-390 doi: 10.1007/s42524-022-0237-x

摘要: Owing to the heterogeneity between functional units and resource scarcity, manufacturing firms have been struggling with intra-organizational coordination for productivity and innovation. Traditional organizational structures, such as linear-functional and matrix, may cause responsibility division and independent goals (Shahani, 2020), and are more difficult to be adopted by large-sized innovative manufacturing firms for quantity production. This is based on a review of several new forms of organization (i.e., network organization, multiteam system, and platform organization) compared with the traditional forms of organization (i.e., linear, matrix, and business unit organization, among others). This study proposes a three-dimensional (3D) magic-cube organizational structure, considering the product dimensions, business, and administration. Moreover, the characteristics, propositions of system operation, system dynamic model, and working model of the 3D magic-cube organization are described. Finally, the 3D model is applied in a Chinese manufacturing firm to test its effectiveness. By redesigning the post and pay system, the pilot organization establishes a project-driven and cross-functional coordination mechanism, positively affecting the firm’s financial profit, output value, labor productivity, and income of per capita. The proposed 3D model can be adopted by large- or medium-sized manufacturing firms for product development and innovation. The implications of both practice and theory are also discussed in this study.

关键词: innovation     manufacturing     3D magic-cube organization structure     coordination    

Characterization of 3D microstructure, thermal conductivity, and heat flow of cement-based foam using

《结构与土木工程前沿(英文)》 2021年 第15卷 第3期   页码 643-651 doi: 10.1007/s11709-021-0709-9

摘要: This study presents the results of the 3D microstructure, thermal conductivity, and heat flow in cement-based foams and examines their changes with a range of densities. Images were captured using X-ray micro computed tomography (micro-CT) imaging technique on cement-based foam samples prepared with densities of 400, 600, and 800 kg/m3. These images were later simulated and quantified using 3D data visualization and analysis software. Based on the analysis, the pore volume of 11000 µm3 was determined across the three densities, leading to optimal results. However, distinct pore diameters of 15 µm for 800 kg/m3, and 20 µm for 600 and 400 kg/m3 were found to be optimum. Most of the pores were spherical, with only 10% appearing elongated or fractured. In addition, a difference of 15% was observed between the 2D and 3D porosity results. Moreover, a difference of 5% was noticed between the experimentally measured thermal conductivity and the numerically predicted value and this variation was constant across the three cast densities. The 3D model showed that heat flows through the cement paste solids and with an increase in porosity this flow reduces.

关键词: 3D pore volume distribution     X-ray tomography     3D shape factor     heat flow    

支架与组织的设计及3D打印 Review

安佳, Joanne Ee Mei Teoh, Ratima Suntornnond, Chee Kai Chua

《工程(英文)》 2015年 第1卷 第2期   页码 261-268 doi: 10.15302/J-ENG-2015061

摘要:

目前,组织工程学中应用3D打印工艺的情况越来越多。本文介绍3D打印技术在组织工程学应用领域的最前沿研究,尤其侧重于计算机辅助支架设计系统的开发、功能梯度支架的直接3D打印、选择性激光烧结 (SLS) 和熔融沉积成型 (FDM) 工艺建模、利用微观和宏观特征进行支架间接增材制造、生物反应器的开发,以及3D/4D生物打印。本文还讨论3D打印的技术限制,进而突出新3D打印方法在组织工程学领域得到进一步改善的可能性。

关键词: 快速原型制造     3D打印     增材制造     组织工程     生物打印    

面向医学应用的3D 打印技术现状综述 Review

严倩,董汉华,苏瑾,韩建华,宋波,魏青松, 史玉升

《工程(英文)》 2018年 第4卷 第5期   页码 729-742 doi: 10.1016/j.eng.2018.07.021

摘要: 3D 打印技术具有解决目前这些问题的潜力,可用于快速制造个性化组织工程支架、细胞原位修复组织缺陷,甚至直接打印组织和器官。本文总结了3D 打印在医学领域相关研究和最新进展的四个层次,介绍了不同类型的生物医用材料,并讨论了医学应用中3D 打印所需材料和构建体外细胞质基质(ECM)存在的问题和未来的发展方向。

关键词: 3D 打印     植入体     支架     生物医学材料    

Origami-Based Design for 4D Printing of 3D Support-Free Hollow Structures

《工程(英文)》 2022年 第12卷 第5期   页码 70-82

使用2D3D和4D增材制造材料开发生物植入物 Review

刘果, 何云虎, 刘朋超, 陈舟, 陈绪梁, 万镭, 李莹, 吕坚

《工程(英文)》 2020年 第6卷 第11期   页码 1232-1243 doi: 10.1016/j.eng.2020.04.015

摘要: 但是,用于制造生物植入物的3D可打印材料仍然非常有限。本研究对用于生物植入物的2D3D AM材料进行了概述。此外,在我们团队先前开发的4D打印陶瓷前驱体及陶瓷材料的基础上,受太极思想的启发,本文提出了一种简单而新颖的软硬集成4D增材制造概念,以应用于人体系统中复杂且动态的生物结构。多材料打印技术的发展,使得人们未来可以使用2D3D、4D AM材料开发生物植入物和软硬集成生物结构。

关键词: 生物打印     2D增材制造     3D打印     4D打印     生物植入物    

Seepage analysis of Upper Gotvand Dam concerning gypsum karstification (2D and 3D approaches)

Jamshid SADREKARIMI, Majid KIYANI, Behnam FAKHRI, Mohammad Javad VAHDATIRAD, Amin BARARI

《结构与土木工程前沿(英文)》 2011年 第5卷 第1期   页码 71-78 doi: 10.1007/s11709-010-0083-5

摘要: Upper Gotvand Dam is constructed on the Karun River at the south west of Iran. In this paper, 2D and 3D models of the dam together with the foundation and abutments were established, and several seepage analyses were carried out. Then, the gypsum veins that are scattered throughout the foundation ground were included in the models, and the seepage pattern, considering the dissolution law of gypsum, was analyzed. It was disclosed that the discharge fluxes obtained from 2D and 3D analyses are not similar, and the discharge flux in 3D model is about four times that of the 2D model. Also, the 3D model locates the phreatic surface somewhat higher than the 2D model. This means that the 2D model estimates lower pore water pressure pattern in comparison with the 3D model. These may be attributed to the fact that with 2D model the lateral components of vectors of seepage velocity are ignored. In the current case, the rate of increase of discharge flux due to dissolution of gypsum veins was obtained to be a third-order function of the aperture width. In spite of the fact that the grout curtain is designed to be about 170 m deep, however, complete dissolve of gypsum will severely increase the discharge flux through the foundation ground.

关键词: Upper Gotvand Dam     seepage analysis     gypsum veins     3D model     discharge flux    

工业4.0复合材料3D打印方法

Bronwyn Fox, Aleksander Subic

《工程(英文)》 2019年 第5卷 第4期   页码 621-623 doi: 10.1016/j.eng.2019.06.003

轴向零泊松比结构心血管支架的设计、3D打印与表征 Article

王程锦, 张磊, 方永聪, 孙伟

《工程(英文)》 2021年 第7卷 第7期   页码 979-990 doi: 10.1016/j.eng.2020.02.013

摘要: 近年来,增材制造技术(也称3D打印技术)在医疗器械领域得到了广泛的应用。本文提出了一种新型的微螺杆挤出式3D打印系统,并利用该系统制备了一种具有零泊松比(ZPR)结构的支架。首先进行了初步的单丝挤出试验来研究合适的制造参数;随后,制备了具有不同几何结构的3D打印支架,并通过扫描电子显微镜(SEM)观察分析支架表面形貌;最后,对不同参数的3D打印支架进行了力学性能评价和初步的生物学评价总之,基于微螺杆挤出式3D打印系统具有制备个性化支架的潜力。

关键词: 增材制造     3D打印     螺杆挤出     心血管支架     零泊松比    

标题 作者 时间 类型 操作

Direct pyrolysis to convert biomass to versatile 3D carbon nanotubes/mesoporous carbon architecture:

期刊论文

An end-to-end 3d seismic simulation of underground structures due to point dislocation source by usingan FK-FEM hybrid approach

Zhenning BA; Jisai FU; Zhihui ZHU; Hao ZHONG

期刊论文

关于3D打印技术在医学模具以及再生组织和器官方面的应用综述

Kan Wang, Chia-Che Ho, Chuck Zhang, Ben Wang

期刊论文

Animage-based approach to the reconstruction of ancient architectures by extracting and arranging 3D

Divya Udayan J,HyungSeok KIM,Jee-In KIM

期刊论文

增材制造(3D打印)发展趋势

卢秉恒, 李涤尘, 田小永

期刊论文

3D打印技术在多个领域取得进展

Chris Palmer

期刊论文

Construction of digital 3D magic-cube organization structure for innovation-driven manufacturing

期刊论文

Characterization of 3D microstructure, thermal conductivity, and heat flow of cement-based foam using

期刊论文

支架与组织的设计及3D打印

安佳, Joanne Ee Mei Teoh, Ratima Suntornnond, Chee Kai Chua

期刊论文

面向医学应用的3D 打印技术现状综述

严倩,董汉华,苏瑾,韩建华,宋波,魏青松, 史玉升

期刊论文

Origami-Based Design for 4D Printing of 3D Support-Free Hollow Structures

期刊论文

使用2D3D和4D增材制造材料开发生物植入物

刘果, 何云虎, 刘朋超, 陈舟, 陈绪梁, 万镭, 李莹, 吕坚

期刊论文

Seepage analysis of Upper Gotvand Dam concerning gypsum karstification (2D and 3D approaches)

Jamshid SADREKARIMI, Majid KIYANI, Behnam FAKHRI, Mohammad Javad VAHDATIRAD, Amin BARARI

期刊论文

工业4.0复合材料3D打印方法

Bronwyn Fox, Aleksander Subic

期刊论文

轴向零泊松比结构心血管支架的设计、3D打印与表征

王程锦, 张磊, 方永聪, 孙伟

期刊论文