Synthesis and physical properties of the conjugated dendrons bearing twisted acenes used in solution processing of organic light-emitting diodes.
Liu Z, Xiao J, Fu Q, Feng H, Zhang X, Ren T, Wang S, Ma D, Wang X, Chen H.Author information College of Chemistry and Environment Science, Key Laboratory of Chemical Biology of Hebei Province, Hebei University , Baoding 071002, P. R. China.AbstractFive novel organic conjugated derivatives containing multifraction twisted acene units have been synthesized and characterized. These compounds and the model molecule 2-methyl-5,12-diphenyl-6:7,10:11-bisbenzotetracene emit strong blue light in diluted solution with quantum yields of 0.21-0.67, while in the solid state, except for the 1,2,3,4,5,6-hexa(2-(5,12-diphenyl-6:7,10:11-bis(4'-tert-butylbenzo)tetracene))benzene, green luminance is seen. The experimental results also indicate that the multifraction structure leads to a significant fluorescence enhancement (over two times) compared to the monomer, which might be attributed to the formation of delocalized excited state in multibranch structures. The quantum-chemical calculation implies that only two branches are involved in formation of the delocalized system for the multibranched derivatives. Furthermore, the organic light-emitting diode (OLED) devices using compounds 1,4-di(2-(5,12-diphenyl-6:7,10:11-bis(4'-tert-butylbenzo)tetracene))benzene, 1,3-di(2-(5,12-diphenyl-6:7,10:11-bis(4'-tert-butylbenzo)tetracene))benzene, and 1,3,5-tri(2-(5,12-diphenyl-6:7,10:11-bis(4'-tert-butylbenzo)tetracene))benzene as emitters exhibit good electroluminescent performance. Our systematic studies might provide more chances to challenge the rational design and synthesis of new- and high-generation branched dendrimers.
ACS applied materials & interfaces.ACS Appl Mater Interfaces.2013 Nov 13;5(21):11136-41. doi: 10.1021/am403394k. Epub 2013 Nov 1.
Five novel organic conjugated derivatives containing multifraction twisted acene units have been synthesized and characterized. These compounds and the model molecule 2-methyl-5,12-diphenyl-6:7,10:11-bisbenzotetracene emit strong blue light in diluted solution with quantum yields of 0.21-0.67, while
Why is ABI effective in detecting vascular stenosis? Investigation based on multibranch hemodynamic model.
Li X, Wang L, Zhang C, Li S, Pu F, Fan Y, Li D.Author information Key Laboratory for Biomechanics and Mechanobiology of Ministry of Education, School of Biological Science and Medical Engineering, Beihang University, Beijing 100191, China.AbstractThe ankle-brachial index (ABI), defined as the ratio of systolic pressure in the ankle arteries and that in the brachial artery, was a useful noninvasive method to detect arterial stenoses. There had been a lot of researches about clinical regularities of ABI; however, mechanism studies were less addressed. For the purpose of a better understanding of the correlation between vascular stenoses and ABI, a computational model for simulating blood pressure and flow propagation in various arterial stenosis circumstances was developed with a detailed compartmental description of the heart and main arteries. Particular attention was paid to the analysis of effects of vascular stenoses in different large-sized arteries on ABI in theory. Moreover, the variation of ABI during the increase of the stenosis severity was also studied. Results showed that stenoses in lower limb arteries, as well as, brachial artery, caused different variations of blood pressure in ankle and brachial arteries, resulting in a significant change of ABI. Furthermore, the variation of ABI became faster when the severity of the stenosis increased, validating that ABI was more sensitive to severe stenoses than to mild/moderate ones. All these in findings revealed the reason why ABI was an effective index for detecting stenoses, especially in lower limb arteries.
The ankle-brachial index (ABI), defined as the ratio of systolic pressure in the ankle arteries and that in the brachial artery, was a useful noninvasive method to detect arterial stenoses. There had been a lot of researches about clinical regularities of ABI; however, mechanism studies were less ad
Multibranch activity in basal and tuft dendrites during firing of layer 5 cortical neurons in vivo.
Hill DN, Varga Z, Jia H, Sakmann B, Konnerth A.Author information Institute of Neuroscience, SyNergy Cluster and Center for Integrated Protein Science, Technical University Munich, 80802 Munich, Germany.AbstractLayer 5 pyramidal neurons process information from multiple cortical layers to provide a major output of cortex. Because of technical limitations it has remained unclear how these cells integrate widespread synaptic inputs located in distantly separated basal and tuft dendrites. Here, we obtained in vivo two-photon calcium imaging recordings from the entire dendritic field of layer 5 motor cortex neurons. We demonstrate that during subthreshold activity, basal and tuft dendrites exhibit spatially localized, small-amplitude calcium transients reflecting afferent synaptic inputs. During action potential firing, calcium signals in basal dendrites are linearly related to spike activity, whereas calcium signals in the tuft occur unreliably. However, in both dendritic compartments, spike-associated calcium signals were uniformly distributed throughout all branches. Thus, our data support a model of widespread, multibranch integration with a direct impact by basal dendrites and only a partial contribution on output signaling by the tuft.
Proceedings of the National Academy of Sciences of the United States of America.Proc Natl Acad Sci U S A.2013 Aug 13;110(33):13618-23. doi: 10.1073/pnas.1312599110. Epub 2013 Jul 31.
Layer 5 pyramidal neurons process information from multiple cortical layers to provide a major output of cortex. Because of technical limitations it has remained unclear how these cells integrate widespread synaptic inputs located in distantly separated basal and tuft dendrites. Here, we obtained in
Dynamics Compensation of Underactuated Link Systems Using Parallel Solution Scheme
磯部 大吾郎,北村 悠人
日本機械学会論文集C編 77(775), 799-812, 2011
… It can be applied to dynamics compensation of different types of configurations such as open-loop, closed-loop, or multibranch link systems, and can also deal with elastic deformations of constituted links without the need to revise any part of the scheme. …
Multibranch Bogoliubov-Bloch spectrum of a cigar-shaped Bose condensate in an optical lattice
Ghosh Tarun Kanti,Machida K.
Physical Review A 72(5), 2005-11
<p>We study properties of excited states of an array of weakly coupled quasi-two-dimensional Bose condensates by using the hydrodynamic theory. The spectrum of the axial excited states strongly …
multibranch Definition from Wiktionary, the free dictionary Jump to: navigation, search English [edit] Etymology [edit] multi-+ branch Adjective [edit] multibranch (not comparable) Of or pertaining to more than one branch (in ...
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