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Evaluation of ionic liquid treated sisal (agave sisalana) fiber as sorbent in biodiesel spill

IOP Conference Series: materials science and engineering 2018年第1期348卷

作者： E Costa A Silva S Mattedi Graduate Program in Chemical Engineering Federal University of Bahia Salvador Bahia Brazil Materials Science and Engineering Department Federal University of Bahia Salvador Bahia Brazil

The global economic development continually demands the use of energy resources, among which various types of oils are widely used. Despite their undeniable economic importance, environmental accidents with these occur frequently. Thus, the search for efficient and low-cost mitigating measures is recurrent. In this context, techniques that use natural adsorbents, such as vegetable fibers, have been studied, since they combine efficiency, selectivity, low cost and sustainability. studies have been carried out using various types of fibers, natural or chemically treated. The interest in treating the fiber lies in the fact that, changing the chemical structure of the fiber, its oil sorption capacity is increased. Due to the offered advantages, an alternative and promising type of surface treatment using ionic liquids was performed, to the detriment of traditional treatments. Thus, the technical feasibility of the use of sisal fiber treated with ionic liquid for adsorption of biodiesel was studied.

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Corrigendum to “Investigations into structure-property relationships of novel Ru(II) dyes with N , N′ -Diethyl group in ancillary ligand for dye-sensitized solar cells” [Dyes Pigments 171(2019) 107754–107762]

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Dyes and Pigments 2020年 173卷

作者： Saba Ashraf Rui Su Javeed Akhtar Humaira M. Siddiqi Ahmed Shuja Khalid A. Al-Saad Siham Y. Al-Qaradawi Ahmed El-Shafei Sulaiman Bin Abdullah Aba Al-Khail – Centre for Interdisciplinary Research in Basic Science (SA-CIRBS) International Islamic University Sector H-10 Islamabad Pakistan Department of Chemistry Quaid-I-Azam University Islamabad 45320 Pakistan Polymer and Color Chemistry Program North Carolina State University Raleigh NC 27695 USA Materials Laboratory Department of Chemistry Mirpur University of Science and Technology (MUST) Mirpur 10250 AK Pakistan Centre for Advanced Electronics and Photovoltaic Engineering (CAEPE) International Islamic University Sector H-10 Islamabad Pakistan Department of Chemistry and Earth Sciences College of Arts and Sciences Qatar University P.O. Box 2713 Doha Qatar

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A coarse-grained phase-field crystal model of plastic motion

arXiv

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arXiv 2019年

作者： Salvalaglio, Marco Angheluta, Luiza Huang, Zhi-Feng Voigt, Axel Elder, Ken R. Viñalsg, Jorge Institute of Scientific Computing Technische Universität Dresden Dresden01062 Germany Hong Kong Institute for Advanced Studies Department of Materials Science and Engineering City University of Hong Kong Hong Kong PoreLab Njord Centre Department of Physics University of Oslo P. O. Box 1048 Oslo0316 Norway Department of Physics and Astronomy Wayne State University DetroitMI48201 United States Technische Universität Dresden Dresden01062 Germany Department of Physics Oakland University RochesterMI48309 United States School of Physics and Astronomy University of Minnesota 116 Church Street SE MinneapolisMN55455 United States

The phase-field crystal model in an amplitude equation approximation is shown to provide an accurate description of the deformation field in defected crystalline structures, as well as of dislocation motion. We analyze in detail stress regularization at a dislocation core given by the model, and show how the Burgers vector density can be directly computed from the topological singularities of the phase-field amplitudes. Distortions arising from these amplitudes are then supplemented with non-singular displacements to enforce mechanical equilibrium. This allows for a consistent separation of plastic and elastic time scales in this framework. A finite element method is introduced to solve the combined amplitude and elasticity equations, which is applied to a few prototypical configurations in two spatial dimensions for a crystal of triangular lattice symmetry: i) the stress field induced by an edge dislocation with an analysis of how the amplitude equation regularizes stresses near the dislocation core, ii) the motion of a dislocation dipole as a result of its internal interaction, and iii) the shrinkage of a rotated grain. We compare our results with those given by other extensions of classical elasticity theory, such as strain-gradient elasticity and methods based on the smoothing of Burgers vector densities near defect cores. Copyright © 2019, The Authors. All rights reserved.

关键词： Finite element method

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Research of pump energy consumption model in the sewage-source heat pump system and optimization method

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Procedia engineering 2017年 205卷 3962-3969页

作者： Zhibin Liu Ronghua Wu Center for Post-doctoral Studies of Materials Science and Engineering Qindao University Qingdao266071 China School of civil Engineering Dalian Minzu University Dalian116600 China School of Electromechanic Engineering Qindao University Qingdao266071 China

Operation energy consumption of heat pump systems is one of the key problems for system design. This study establishes the models of transportation energy consumption ratio and transportation distance limit and puts forward the concepts of new economic specific frictional resistance. According to existing calculation formulas of specific frictional resistance, calculation formulas for more economic specific frictional resistance are deduced by combining with economic indexes. In this way, a range (30–400 Pa/m) of new economic specific frictional resistance is obtained to determine the transportation energy consumption ratio of water. On this basis, the pipe network is designed to reduce and control the transportation energy consumption ratio of pumps to 15%-20%.

关键词： Heat pump system Transportation energy consumption Transportation distance Economic specific frictional resistance

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LZS/Al2O3 glass-ceramic composites sintered by fast firing

LZS/Al2O3 glass-ceramic composites sintered by fast firing

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作者： Arcaro, Sabrina Nieto, Maria Isabel Moreno, Rodrigo Salvador, Maria Dolores Borrell, Amparo Moreno, Berta Chinarro, Eva De Oliveira, Antonio Pedro Novaes Laboratory of Glass-Ceramic Materials VITROCER Federal University of Santa Catarina - UFSC Florianópolis SC88040-900 Brazil Graduate Program in Materials Science and Engineering - PGMAT Federal University of Santa Catarina - UFSC Florianópolis SC88040-900 Brazil Institute of Ceramics and Glass - CSIC Madrid Spain Institute of Materials Technology Polytechnic University of Valencia Spain

In this work, nanometric Al2O3 (1-5 vol.%) particles (13 nm, 100 m2/g) were added to a 19.58Li2O•11.10ZrO2•69.32SiO2 (mol%) (3.5 µm, 2.5 m2/g) parent glass-ceramic matrix to prepare composites with the purpose of studying the influence of Al2O3 on their structure, microstructure, mechanical, thermal and electrical properties when sintered by fast firing. The parent glass-ceramic was prepared by melting and fast cooling (in water) to obtain a glass frit. The resulting glass frit was milled according to a two-step procedure consisting on a dry milling stage followed by a long wet milling step down. Each composition was wet homogenized and then dried at 110 ºC for 48 h for disaggregation. The obtained powders were uniaxially pressed (100 MPa) and compacts sintered by fast firing (175 ºC/min) between 800 and 900 ºC for 30 min. The composites, with relative densities ranging from 89% to 93%, showed zircon and β-spodumene as main crystalline phases. The hardness and Young's modulus varied from 4.5 to 6.5 GPa, and from 65 to 102 GPa, respectively. The formation of β-spodumene in the obtained composites leads to reduce the CTEs, whose values ranged from 13 to 7 x 10-6 ºC-1 © 2017 Universidade Federal de Sao Carlos. All rights reserved.

关键词： Sintering

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Internal nanostructure diagnosis with hyperbolic phonon polaritons in hexagonal boron nitride

arXiv

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arXiv 2018年

作者： Dai, Siyuan Tymchenko, Mykhailo Xu, Zai-Quan Tran, Toan T. Yang, Yafang Ma, Qiong Watanabe, Kenji Taniguchi, Takashi Jarillo-Herrero, Pablo Aharonovich, Igor Basov, Dimitri N. Tao, Tiger H. Alù, Andrea Department of Electrical & Computer Engineering University of Texas AustinTX78712 United States Institute of Biomedical Materials and Devices Faculty of Science University of Technology Sydney UltimoNSW2007 Australia Department of Physics Massachusetts Institute of Technology CambridgeMA02215 United States National Institute for Materials Science Namiki 1-1 Tsukuba Ibaraki305-0044 Japan Department of Physics Columbia University New YorkNY10027 United States Department of Mechanical Engineering University of Texas AustinTX78712 United States Photonics Initiative Advanced Science Research Center City University of New York New York10031 United States Physics Program Graduate Center City University of New York New York10016 United States Department of Electrical Engineering City College of the City University of New York New York10031 United States

Imaging materials and inner structures with resolution below the diffraction limit has become of fundamental importance in recent years for a wide variety of applications. In this work, we report sub-diffractive internal structure diagnosis of hexagonal boron nitride by exciting and imaging hyperbolic phonon polaritons. Based on their unique propagation properties, we are able to accurately locate defects in the crystal interior with nanometer resolution. The precise location, size and geometry of the concealed defects is reconstructed by analyzing the polariton wavelength, reflection coefficient and their dispersion. We have also studied the evolution of polariton reflection, transmission and scattering as a function of defect size and photon frequency. The nondestructive high-precision polaritonic structure diagnosis technique introduced here can be also applied to other hyperbolic or waveguide systems, and may be deployed in the next-generation bio-medical imaging, sensing and fine structure analysis. Copyright © 2018, The Authors. All rights reserved.

关键词： Van der Waals forces

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The mechanics while bridging pristine graphene patches for large area or 3-Dimensional structure

The mechanics while bridging pristine graphene patches for l...

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第二十一届国际复合材料大会

作者： Yujie Wei JiangtaoWu Hanqing Yin Xinghua Shi Ronggui Yang Mildred Dresselhaus LNM Institute of MechanicsChinese Academy of Sciences Department of Mechanical Engineering and Materials Science and Engineering Program University of Colorado Department of Physics and EECS Massachusetts Institute of Technology

Like most crystalline materials,two-dimensional materials exhibit rich mechanical behavior which heavily depends on their crystalline orientations and the arrangement existing *** we illustrate in detail how the strength and the fracture behavior are influenced by crystalline orientations in pristine *** reveal the crack kinking behavior as well as the orientation dependence of apparent fracture *** addition,we show how typical defects

关键词： The mechanics while bridging pristine graphene patches for large area or 3-Dimensional structure

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Characterization of temporarily-captured minimoon 2020 CD3 by Keck time-resolved spectrophotometry

arXiv

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arXiv 2020年

作者： Bolin, Bryce T. Fremling, Christoffer Holt, Timothy R. Hankins, Matthew J. Ahumada, Tomás Anand, Shreya Bhalerao, Varun Burdge, Kevin B. Copperwheat, Chris M. Coughlin, Michael Deshmukh, Kunal P. De, Kishalay Kasliwal, Mansi M. Morbidelli, Alessandro Purdum, Josiah N. Quimby, Robert Bodewits, Dennis Chang, Chan-Kao Ip, Wing-Huen Hsu, Chen-Yen Laher, Russ R. Lin, Zhong-Yi Lisse, Carey M. Masci, Frank J. Ngeow, Chow-Choong Tan, Hanjie Zhai, Chengxing Burruss, Rick Dekany, Richard Delacroix, Alexandre Duev, Dmitry A. Graham, Matthew Hale, David Kulkarni, Shrinivas R. Kupfer, Thomas Mahabal, Ashish Mróz, Przemyslaw J. Neill, James D. Riddle, Reed Rodriguez, Hector Smith, Roger M. Soumagnac, Maayane T. Walters, Richard Yan, Lin Zolkower, Jeffry Division of Physics Mathematics and Astronomy California Institute of Technology PasadenaCA91125 United States IPAC Mail Code 100-22 Caltech 1200 E. California Blvd. PasadenaCA91125 United States University of Southern Queensland Computational Engineering and Science Research Centre QLD Australia Southwest Research Institute Department of Space Studies BoulderCO80302 United States Department of Astronomy University of Maryland College ParkMD20742 United States Division of Physics Mathematics and Astronomy California Institute of Technology PasadenaCA91125 United States Department of Physics Indian Institute of Technology Bombay Powai Mumbai400076 India Astrophysics Research Institute Liverpool John Moores University 146 Brownlow Hill LiverpoolL3 5RF United Kingdom School of Physics and Astronomy University of Minnesota MinneapolisMN55455 United States Department of Metallurgical Engineering and Materials Science Indian Institute of Technology Bombay Powai Mumbai400076 India Université Côte d’Azur Observatoire de la Côte d’Azur CNRS Laboratoire Lagrange Boulevard de l’Observatoire CS 34229 Nice cedex 406304 France Department of Astronomy San Diego State University 5500 Campanile Dr San DiegoCA92182 United States University of Tokyo Institutes for Advanced Study University of Tokyo KashiwaChiba277-8583 Japan Physics Department Leach Science Center Auburn University AuburnAL36832 United States Institute of Astronomy National Central University 32001 Taiwan Johns Hopkins University Applied Physics Laboratory LaurelMD20723 United States Jet Propulsion Laboratory California Institute of Technology 4800 Oak Grove Drive PasadenaCA91109 United States Caltech Optical Observatories California Institute of Technology PasadenaCA91125 United States Kavli Institute for Theoretical Physics University of California Santa BarbaraCA93106 United States Center for Data Driven Discovery California Institute of Technology PasadenaCA

We present rotationally-averaged visible spectrophotometry of minimoon 2020 CD3, the second asteroid known to become temporarily captured by the Earth-Moon system’s gravitational field. The spectrophotometry was taken with Keck I/LRIS between wavelengths 434 nm and 912 nm in B, g, V, R, I and RG850 filters as it was leaving the Earth-Moon system on 2020 March 23 UTC. The broad-band spectrophotometry of 2020 CD3 most closely resembles the spectra of V-type asteroids and some Lunar rock samples with a reddish slope of ∼18%/100 nm between 434 nm and 761 nm corresponding to colors of g-r = 0.62±0.08, r-i = 0.21 ± 0.06 and an absorption band at ∼900 nm corresponding to i-z = -0.54±0.10 (DeMeo et al. 2009;Isaacson et al. 2011). Combining our measured 31.9±0.1 absolute magnitude with an albedo of 0.35 typical for V-type asteroids (DeMeo & Carry 2013), we determine 2020 CD3’s size to be ∼1.0±0.1 m making it the first minimoon and one of the smallest asteroids to be spectrally characterized. We use our time-series photometry to detect periodic lightcurve variations with a −4 false alarm probability corresponding to a lightcurve period of ∼573 s and a lightcurve amplitude of ∼1 mag implying 2020 CD3 possesses a b/a axial ratio of ∼2.5. In addition, we extend the observational arc of 2020 CD3 to 37 days between 2020 February 15 UTC and 2020 March 23 UTC. From the improved orbital solution for 2020 CD3, we estimate its likely duration of its capture to be ∼2 y, and we measure the non-gravitation perturbation on its orbit due to radiation pressure with an area-to-mass ratio of 6.9±2.4×10−4 m2/kg implying a density of 2.1±0.7 g/cm3, broadly compatible with the densities of other meter-scale asteroids (e.g., Micheli et al. 2012;Mommert et al. 2014) and Lunar rock (∼2.4 g/cm3, Kiefer et al. 2012). We searched for pre-discovery observations of 2020 CD3 in the ZTF archive as far back as 2018 October (Masci et al. 2019), but were unable to locate any positive detections. Copyright © 2

关键词： Asteroids

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In Vivo Imaging: Multiplexed NIR‐II Probes for Lymph Node‐Invaded Cancer Detection and Imaging‐Guided Surgery (Adv. Mater. 11/2020)

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Advanced materials 2020年第11期32卷

作者： Rui Tian Huilong Ma Shoujun Zhu Joseph Lau Rui Ma Yijing Liu Lisen Lin Swati Chandra Sheng Wang Xingfu Zhu Hongzhang Deng Gang Niu Mingxi Zhang Alexander L. Antaris Kenneth S. Hettie Bai Yang Yongye Liang Xiaoyuan Chen Key Laboratory of Organ Regeneration and Transplantation of the Ministry of Education The First Hospital of Jilin University Changchun 130061 P. R. China Laboratory of Molecular Imaging and Nanomedicine National Institute of Biomedical Imaging and Bioengineering (NIBIB) National Institutes of Health (NIH) Bethesda MD 20892 USA Department of Materials Science and Engineering Shenzhen Key Laboratory of Printed Organic Electronics Southern University of Science and Technology Shenzhen 518055 P. R. China State Key Laboratory of Supramolecular Structure and Materials College of Chemistry Jilin University Changchun 130012 P. R. China State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan 430070 P. R. China Intuitive Surgical Kifer Rd Sunnyvale CA 94086 USA Molecular Imaging Program at Stanford (MIPS) Department of Radiology Stanford University School of Medicine Stanford CA 94305 USA

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Peptide Brush Polymers for Efficient Delivery of a Gene Editing Protein to Stem Cells

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Angewandte Chemie 2019年第44期131卷

作者： Angela P. Blum David A. Nelles Francisco J. Hidalgo Mollie A. Touve Deborah S. Sim Assael A. Madrigal Gene W. Yeo Nathan C. Gianneschi Department of Chemistry and Biochemistry University of California San Diego La Jolla CA USA Departments of Chemistry Hamilton College Clinton NY USA Department of Cellular and Molecular Medicine Stem Cell Program Institute of Genomic Medicine University of California San Diego La Jolla CA USA Departments of Chemistry Materials Science & Engineering Biomedical Engineering International Institute for Nanotechnology Northwestern University Evanston IL USA Molecular Engineering Laboratory A*STAR Singapore Singapore

The scarcity of effective means to deliver functional proteins to living cells is a central problem in biotechnology and medicine. Herein, we report the efficient delivery of an active DNA‐modifying enzyme to human stem cells through high‐density cell penetrating peptide brush polymers. Cre recombinase is mixed with a fluorophore‐tagged polymer carrier and then applied directly to induced pluripotent stem cells or HEK293T cells. This results in efficient delivery of Cre protein as measured by activation of a genomically integrated Cre‐mediated recombination reporter. We observed that brush polymer formulations utilizing cell penetrating peptides promoted Cre delivery but oligopeptides alone or oligopeptides displayed on nanoparticles did not. Overall, we report the efficient delivery of a genome‐modifying enzyme to stem cells that may be generalizable to other, difficult‐to‐transduce cell types.

关键词： Enzymtransport Proteintransport Stammzellen Zellaufnahme Zellpenetrierende Peptide

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