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  • 1
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    Origami by frontal photopolymerization (2017)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2017-04-29
    Description: Origami structures are of great interest in microelectronics, soft actuators, mechanical metamaterials, and biomedical devices. Current methods of fabricating origami structures still have several limitations, such as complex material systems or tedious processing steps. We present a simple approach for creating three-dimensional (3D) origami structures by the frontal photopolymerization method, which can be easily implemented by using a commercial projector. The concept of our method is based on the volume shrinkage during photopolymerization. By adding photoabsorbers into the polymer resin, an attenuated light field is created and leads to a nonuniform curing along the thickness direction. The layer directly exposed to light cures faster than the next layer; this nonuniform curing degree leads to nonuniform curing–induced volume shrinkage. This further introduces a nonuniform stress field, which drives the film to bend toward the newly formed side. The degree of bending can be controlled by adjusting the gray scale and the irradiation time, an easy approach for creating origami structures. The behavior is examined both experimentally and theoretically. Two methods are also proposed to create different types of 3D origami structures.
    Electronic ISSN: 2375-2548
    Topics: Natural Sciences in General
    Published by American Association for the Advancement of Science (AAAS)
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  • 2
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    eIF1A augments Ago2-mediated Dicer-independent miRNA biogenesis and RNA interference (2015)
    Springer Nature
    Details
    Publication Date: 2015-05-30
    Description: Article miRNAs are incorporated into ribonucleoprotein complexes called RNA-induced silencing complexes (RISCs) to exert RNA interference. Here the authors show that translation initiation factor eIF1A interacts with the RISCs component Ago2 to promote miR-451 biogenesis and RNA interference. Nature Communications doi: 10.1038/ncomms8194 Authors: Tingfang Yi, Haribabu Arthanari, Barak Akabayov, Huaidong Song, Evangelos Papadopoulos, Hank H. Qi, Mark Jedrychowski, Thomas Güttler, Cuicui Guo, Rafael E. Luna, Steven P. Gygi, Stephen A. Huang, Gerhard Wagner
    Electronic ISSN: 2041-1723
    Topics: Biology , Chemistry and Pharmacology , Natural Sciences in General , Physics
    Published by Springer Nature
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  • 3
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    Improved the Durability of Thermal Barrier Coatings with Interface Modified by Three-Dimensional Mesh Patterns (2016)
    Wiley
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    Publication Date: 2016-06-22
    Description: An approach to improve the lifetime of air plasma sprayed (APS) thermal barrier coatings (TBCs) by modifying the interfacial microstructure has been reported. The laser powder deposition technique was employed to fabricate the mesh structure (with the same composition as the bond coat) at the ceramic–substrate interface. After thermal cycling test, the APS TBCs with the mesh exhibited a much less spallation degree (5%–10%) compared with the reference samples without mesh (〉50%), implying that the mesh is effective in impeding the crack propagation along the interface. In addition, the effect of the mesh geometry parameters, e.g., height and spacing of mesh, on the spallation degree of TBCs was also investigated. Based on the results of experiment and calculation, the optimal mesh parameters were proposed.
    Print ISSN: 0002-7820
    Electronic ISSN: 1551-2916
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Published by Wiley
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  • 4
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    SOX4 contributes to the progression of cervical cancer and the resistance to the chemotherapeutic drug through ABCG2 (2015)
    Springer Nature
    Details
    Publication Date: 2015-11-20
    Description: SOX4 contributes to the progression of cervical cancer and the resistance to the chemotherapeutic drug through ABCG2 Cell Death and Disease 6, e1990 (November 2015). doi:10.1038/cddis.2015.290 Authors: R Sun, B Jiang, H Qi, X Zhang, J Yang, J Duan, Y Li & G Li
    Electronic ISSN: 2041-4889
    Topics: Biology , Medicine
    Published by Springer Nature
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  • 5
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    Presence of monovalent oxygen anions in oxides demonstrated using X-ray photoelectron spectra (2016)
    American Institute of Physics (AIP)
    Details
    Publication Date: 2016-01-16
    Description: The oxygen vacancy model has been used to explain the magnetic and electrical transport properties of dilute magnetic semiconductors and resistive switching. In particular, some authors have claimed that they found a symmetric peak corresponding to the oxygen vacancies in O1s photoelectron spectra. In this paper, using X-ray photoelectron spectra with argon ion etching, it is shown that this symmetric peak may also be interpreted as being related to O 1− anions, rather than to oxygen vacancies.
    Print ISSN: 0003-6951
    Electronic ISSN: 1077-3118
    Topics: Physics
    Published by American Institute of Physics (AIP)
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  • 6
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    A laboratory experimental study of high-temperature thermal storage in the unsaturated soil using a vertical borehole heat exchanger (2011)
    Oxford University Press
    Details
    Publication Date: 2011-11-24
    Description: High-temperature thermal storage (HTTS) in soils is a promising energy-saving technology for space heating of buildings. Based on a laboratory experimental setup using a vertical borehole heat exchanger (BHE), dynamic changes of the soil temperature and moisture content during the thermal storage process are studied. Effects of the heat injection temperature and initial moisture content on the thermal performance of the BHE are analyzed. The results show that at the first thermal storage stage, the soil temperature and moisture content near the heat source may appear a temporary peak. Its occurrence depends on the initial soil moisture content, the heat injection temperature and the distance from the heat source. As the heat injection temperature increases, the heat transfer rate of the BHE increases greatly. As the initial soil moisture content increases, the temperature profile near the BHE tends to be deviated from the results predicted by heat conduction, thereby influencing the thermal performance of the BHE. The present results can provide useful guidelines for the design of an HTTS system.
    Print ISSN: 1748-1317
    Electronic ISSN: 1748-1325
    Topics: Energy, Environment Protection, Nuclear Power Engineering , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Published by Oxford University Press
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  • 7
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    A Novel and Effective Multivariate Method for Compositional Analysis using Laser Induced Breakdown Spectroscopy (2014)
    Institute of Physics (IOP)
    Details
    Publication Date: 2014-03-20
    Description: Compositional analysis is important to interrogate spectral samples for direct analysis of materials in agriculture, environment and archaeology, etc. In this paper, multi-variate analysis (MVA) techniques are coupled with laser induced breakdown spectroscopy (LIBS) to estimate quantitative elemental compositions and determine the type of the sample. In particular, we present a new multivariate analysis method for composition analysis, referred to as "spectral unmixing". The LIBS spectrum of a testing sample is considered as a linear mixture with more than one constituent signatures that correspond to various chemical elements. The signature library is derived from regression analysis using training samples or is manually set up with the information from an elemental LIBS spectral database. A calibration step is used to make all the signatures in library to be homogeneous with the testing sample so as to avoid inhomogeneous signatures that might be caused by different sampling c...
    Print ISSN: 1755-1307
    Electronic ISSN: 1755-1315
    Topics: Geography , Geosciences , Physics
    Published by Institute of Physics (IOP)
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  • 8
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    Study of cation magnetic moment directions in Cr (Co) doped nickel ferrites (2014)
    American Institute of Physics (AIP)
    Details
    Publication Date: 2014-09-23
    Description: Powder samples of the ferrites M x Ni 1− x Fe 2 O 4 ( M  = Cr, Co and 0.0 ≤  x  ≤ 0.3) were prepared using a chemical co-precipitation method. X-ray diffraction analysis showed that the two series of samples had a single-phase cubic spinel structure. It was found that the magnetic moments ( μ exp ) per formula of samples measured at 10 K decreased when Cr substituted for Ni, but increased when Co substituted for Ni, in spite of the fact that the magnetic moments of Cr 2+ (4 μ B ) and Co 2+ (3 μ B ) are higher than that of Ni 2+ (2 μ B ). With the assumption that the magnetic moments of Cr 2+ and Cr 3+ lie antiparallel to those of the Fe, Co, and Ni cations in the same sublattices of spinel ferrites, the dependences on the Cr (Co) doping level of the sample magnetic moments at 10 K were fitted successfully, using the quantum-mechanical potential barrier model earlier proposed by our group. For the two series of samples, the fitted magnetic moments are close to the experimental results.
    Print ISSN: 0021-8979
    Electronic ISSN: 1089-7550
    Topics: Physics
    Published by American Institute of Physics (AIP)
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  • 9
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    Optical cavity quantum electrodynamics with dark-state polaritons (2014)
    American Physical Society (APS)
    Details
    Publication Date: 2014-04-12
    Description: Author(s): G. W. Lin, Jiangbin Gong, J. Yang, Y. H. Qi, X. M. Lin, Y. P. Niu, and S. Q. Gong We present a theoretical scheme to study optical cavity quantum electrodynamics using dark-state polaritons. Exploiting the highly tunable lifetimes of the photons in the form of cavity dark-state polaritons, we push the strong coupling of single optical photons to an effective two-level emitter in ... [Phys. Rev. A 89, 043815] Published Fri Apr 11, 2014
    Keywords: Quantum optics, physics of lasers, nonlinear optics, classical optics
    Print ISSN: 1050-2947
    Electronic ISSN: 1094-1622
    Topics: Physics
    Published by American Physical Society (APS)
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  • 10
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    Processing of the notch ligand delta by the metalloprotease Kuzbanian (1999)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1999-01-05
    Description: Signaling by the Notch surface receptor controls cell fate determination in a broad spectrum of tissues. This signaling is triggered by the interaction of the Notch protein with what, so far, have been thought to be transmembrane ligands expressed on adjacent cells. Here biochemical and genetic analyses show that the ligand Delta is cleaved on the surface, releasing an extracellular fragment capable of binding to Notch and acting as an agonist of Notch activity. The ADAM disintegrin metalloprotease Kuzbanian is required for this processing event. These observations raise the possibility that Notch signaling in vivo is modulated by soluble forms of the Notch ligands.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Qi, H -- Rand, M D -- Wu, X -- Sestan, N -- Wang, W -- Rakic, P -- Xu, T -- Artavanis-Tsakonas, S -- NS14841/NS/NINDS NIH HHS/ -- NS26084/NS/NINDS NIH HHS/ -- New York, N.Y. -- Science. 1999 Jan 1;283(5398):91-4.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Howard Hughes Medical Institute, Yale University School of Medicine, Boyer Center for Molecular Medicine, 295 Congress Avenue, New Haven, CT 06536-0812, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/9872749" target="_blank"〉PubMed〈/a〉
    Keywords: Amino Acid Sequence ; Animals ; Cell Line ; Cells, Cultured ; Disintegrins/genetics/*metabolism ; Drosophila/embryology/genetics/metabolism ; *Drosophila Proteins ; Female ; Intracellular Signaling Peptides and Proteins ; Ligands ; Male ; Membrane Proteins/genetics/*metabolism ; Metalloendopeptidases/genetics/*metabolism ; Molecular Sequence Data ; Mutation ; Neurons/cytology ; Protein Processing, Post-Translational ; Receptors, Notch ; Signal Transduction ; Transfection
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
    Published by American Association for the Advancement of Science (AAAS)
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