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Investigations of NanoBud formation
Nasibulin, Albert G.,Anisimov, Anton S.,Pikhitsa, Peter V.,Jiang, Hua,Brown, David P.,Choi, Mansoo,Kauppinen, Esko I. Elsevier 2007 Chemical physics letters Vol.446 No.1
<P><B>Graphical abstract</B></P><P>Schematic presentation of a novel carbon nanomaterial, NanoBud, grown by continuous transportation of a carbon layer from a catalyst particle to a CNT.</P><ce:figure></ce:figure> <P><B>Abstract</B></P><P>The formation of a novel hybrid material, NanoBuds, single-walled carbon nanotubes (CNTs) with covalently attached fullerenes was investigated in a ferrocene–carbon monoxide system. Fullerenes and CNTs were simultaneously formed by carbon monoxide disproportionation on the surface of iron particles in the presence of etching agents such as H<SUB>2</SUB>O and CO<SUB>2</SUB>. On the basis of parametric investigations and <I>in situ</I> sampling of the product from different locations in the reactor the mechanisms for NanoBud formation are discussed.</P>
Tie1 controls angiopoietin function in vascular remodeling and inflammation
Korhonen, Emilia A.,Lampinen, Anita,Giri, Hemant,Anisimov, Andrey,Kim, Minah,Allen, Breanna,Fang, Shentong,D Amico, Gabriela,Sipilä,, Tuomas J.,Lohela, Marja American Society for Clinical Investigation 2016 The Journal of clinical investigation Vol.126 No.9
<P>The angiopoietin/Tie (ANG/Tie) receptor system controls developmental and tumor angiogenesis, inflammatory vascular remodeling, and vessel leakage. ANG1 is a Tie2 agonist that promotes vascular stabilization in inflammation and sepsis, whereas ANG2 is a context-dependent Tie2 agonist or antagonist. A limited understanding of ANG signaling mechanisms and the orphan receptor Tie1 has hindered development of ANG/Tie-targeted therapeutics. Here, we determined that both ANG1 and ANG2 binding to Tie2 increases Tie1-Tie2 interactions in a 131 integrin-dependent manner and that Tie1 regulates ANG-induced Tie2 trafficking in endothelial cells. Endothelial Tie1 was essential for the agonist activity of ANG1 and autocrine ANG2. Deletion of endothelial Tiel in mice reduced Tie2 phosphorylation and downstream Akt activation, increased FOXO1 nuclear localization and transcriptional activation, and prevented ANG1- and ANG2-induced capillary-to-venous remodeling. However, in acute endotoxemia, the Tie1 ectodomain that is responsible for interaction with Tie2 was rapidly cleaved, ANG1 agonist activity was decreased, and autocrine ANG2 agonist activity was lost, which led to suppression of Tie2 signaling. Tie1 cleavage also occurred in patients with hantavirus infection. These results support a model in which Tie1 directly interacts with Tie2 to promote ANG-induced vascular responses under noninflammatory conditions, whereas in inflammation, Tie1 cleavage contributes to loss of ANG2 agonist activity and vascular stability.</P>
Sergey V. Tararykin,Anatoly A. Anisimov,Artem A. Gerasimov 제어·로봇·시스템학회 2019 International Journal of Control, Automation, and Vol.17 No.10
A method is proposed for creating an optimal parametrically robust structure system of a state observer based on the process of similarity converting of a plant model, in which the conversion matrix is formed by varying singular numbers of controllability and observability gramians. The method enables a state observer structure to be obtained with a definite ratio of controllability and observability that permits fulfillment of parametric robustness conditions, namely, absence of positive feedback in the controller’s composition.
Dina V. Dudina,Vyacheslav I. Mali,Alexander G. Anisimov,Natalia V. Bulina,Michail A. Korchagin,Oleg I. Lomovsky,Ivan A. Bataev,Vladimir A. Bataev 대한금속·재료학회 2013 METALS AND MATERIALS International Vol.19 No.6
We present several possible microstructure development scenarios in Ti3SiC2-Cu composites during mechanical milling and Spark Plasma Sintering (SPS). We have studied the effect of in situ consolidation during milling of Ti3SiC2 and Cu powders and melting of the Cu matrix during the SPS on the hardness and electrical conductivity of the sintered materials. Under low-energy milling, (3-5) vol.%Ti3SiC2-Cu composite particles of platelet morphology formed, which could be easily SPS-ed to 92-95% relative density. Under high-energy milling, millimeter-scale (3-5) vol.%Ti3SiC2-Cu granules formed as a result of in situ consolidation and presented a challenge to be sintered into a bulk fully dense sample; the corresponding SPS-ed compacts demonstrated a finer-grained Cu matrix and more significant levels of hardening compared to composites of the same composition processed by low-energy milling. The 3 vol.% Ti3SiC2-Cu in situ consolidated and Spark Plasma Sintered granules showed an extremely high hardness of 227 HV. High electrical conductivity of the Ti3SiC2-Cu composites sintered from the granules was an indication of efficient sintering of the granules to each other. Partial melting of the Cu matrix, if induced during the SPS, compromised the phase stability and uniformity of the microstructure of the Ti3SiC2-Cu composites and thus it is not to be suggested as a pathway to enhanced densification in this system.
A novel hybrid carbon material
Nasibulin, Albert G.,Pikhitsa, Peter V.,Jiang, Hua,Brown, David P.,Krasheninnikov, Arkady V.,Anisimov, Anton S.,Queipo, Paula,Moisala, Anna,Gonzalez, David,Lientschnig, Gü,nther,Hassanien, Abdou,S Springer Science and Business Media LLC 2007 Nature nanotechnology Vol.2 No.3
<P>Both fullerenes and single-walled carbon nanotubes (SWNTs) exhibit many advantageous properties. Despite the similarities between these two forms of carbon, there have been very few attempts to physically merge them. We have discovered a novel hybrid material that combines fullerenes and SWNTs into a single structure in which the fullerenes are covalently bonded to the outer surface of the SWNTs. These fullerene-functionalized SWNTs, which we have termed NanoBuds, were selectively synthesized in two different one-step continuous methods, during which fullerenes were formed on iron-catalyst particles together with SWNTs during CO disproportionation. The field-emission characteristics of NanoBuds suggest that they may possess advantageous properties compared with single-walled nanotubes or fullerenes alone, or in their non-bonded configurations.</P>