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排序方式: 共有282条查询结果,搜索用时 31 毫秒
1.
Vera S. Chernonosova Alexander A. Gostev Yuriy A. Chesalov Andrey A. Karpenko Alexander M. Karaskov Pavel P. Laktionov 《国际聚合物材料杂志》2019,68(1-3):34-43
AbstractEnsuring long-term functioning and efficient endothelialization of small diameter vascular grafts (VG) is an urgent task of tissue engineering. A solution may be to use electrospun VGs prepared from blends polyurethane with gelatin and/or bivalirudin. Here, properties of 3D matrices were explored by SEM, contact angle measurements and IR spectroscopy, and their interaction with blood and endothelial cells was studied. Introduction of gelatin into matrices enhanced adhesion and proliferation of endotheliocytes and enabled adhesion of platelets, whereas bivalirudin inhibited platelet adhesion while having no negative effect on the adhesion and proliferation of endothelial cells. 相似文献
2.
Just a few years ago it was generally believed that the NMR properties of superfluid3He far below Tc would not be qualitatively different from those found at higher temperatures. Surprisingly, the strange enhancement of relaxation processes at around 0.4 Tc named catastrophic relaxation, was then found. Recently an extremely long lived induction signal with new dynamical properties was discovered in the region of 100 K. Some of the newly discovered properties can be partly explained, although there are still many unsolved problems. The main aim of this article is to raise new questions for future investigations at the lowest temperatures presently possible. 相似文献
3.
Ping Cai Ling Ding Ziming Chen Dianhui Wang Hongliang Peng Changlai Yuan Chaohao Hu Lixian Sun Yuriy N. Luponosov Fei Huang Qifan Xue 《Advanced functional materials》2023,33(30):2300113
2D Ti3C2Tx MXene, possessing facile preparation, high electrical conductivity, flexibility, and solution processability, shows good application potential for enhancing device performance of perovskite solar cells (PVSCs). In this study, tetrabutylammonium bromide functionalized Ti3C2Tx (TBAB-Ti3C2Tx) is developed as cathode buffer layer (CBL) to regulate the PCBM/Ag cathode interfacial property for the first time. By virtue of the charge transfer from TBAB to Ti3C2Tx demonstrated by electron paramagnetic resonance and density functional theory, the TBAB-Ti3C2Tx CBL with high electrical conductivity exhibits significantly reduced work function of 3.9 eV, which enables optimization of energy level alignment and enhancement of charge extraction. Moreover, the TBAB-Ti3C2Tx CBL can effectively inhibit the migration of iodine ions from perovskite layer to Ag cathode, which synergistically suppresses defect states and reduce charge recombination. Consequently, utilizing MAPbI3 perovskite without post-treatment, the TBAB-Ti3C2Tx based device exhibits a dramatically improved power conversion efficiency of 21.65% with significantly improved operational stability, which is one of the best efficiencies reported for the devices based on MAPbI3/PCBM with different CBLs. These results indicate that TBAB-Ti3C2Tx shall be a promising CBL for high-performance inverted PVSCs and inspire the further applications of quaternary ammonium functionalized MXenes in PVSCs. 相似文献
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Video microscopy is a widely applied diagnostic to investigate the structure and the dynamics of particles in dusty plasmas. Reliable algorithms are required to accurately recover particle positions from the camera images. Here, four different particle positioning techniques have been tested on artificial and experimental data of dusty plasma situations. Two methods that rely on pixel-intensity thresholds were found to be strongly affected by pixel-locking errors and by noise. Two other methods-one applying spatial bandpass filters and the other fitting polynomials to the intensity pattern-yield subpixel resolution under various conditions. These two methods have been shown to be ideally suited to recover particle positions even from small-scale fluctuations that are used to derive the normal mode spectra of finite dust clusters. 相似文献
6.
Formalized study of self-assembly has led to the definition of the tile assembly model [Erik Winfree, Algorithmic self-assembly of DNA, Ph.D. Thesis, Caltech, Pasadena, CA, June 1998; Paul Rothemund, Erik Winfree, The program-size complexity of self-assembled squares, in: ACM Symposium on Theory of Computing, STOC02, Montreal, Quebec, Canada, 2001, pp. 459–468]. Research has identified two issues at the heart of self-assembling systems: the number of steps it takes for an assembly to complete, assuming maximum parallelism, and the minimal number of tiles necessary to assemble a shape. In this paper, I define the notion of a tile assembly system that computes a function, and tackle these issues for systems that compute the sum and product of two numbers. I demonstrate constructions of such systems with optimal Θ(1) distinct tile types and prove the assembly time is linear in the size of the input. 相似文献
7.
Yuriy M. Bunkov 《Journal of Low Temperature Physics》2004,135(5-6):337-359
This article is dedicated to the memory of Olli Lounasmaa, the physicist, who directed my scientific life along the path of superfluid 3He! In the article I review the results of experimental and theoretical studies of superfluid 3He spin dynamics at ultralow temperatures, where the density of the normal component is virtually zero. I describe our current understanding of the phenomena of catastrophic relaxation, NMR in the Landau field and the surface instability of homogeneous precession. PACS numbers: 67.57.Lm. 相似文献
8.
Manish Motwani Sandhya Sankaranarayanan René Just Yuriy Brun 《Empirical Software Engineering》2018,23(5):2901-2947
Existing evaluations of automated repair techniques focus on the fraction of the defects for which the technique can produce a patch, the time needed to produce patches, and how well patches generalize to the intended specification. However, these evaluations have not focused on the applicability of repair techniques and the characteristics of the defects that these techniques can repair. Questions such as “Can automated repair techniques repair defects that are hard for developers to repair?” and “Are automated repair techniques less likely to repair defects that involve loops?” have not, as of yet, been answered. To address such questions, we annotate two large benchmarks totaling 409 C and Java defects in real-world software, ranging from 22K to 2.8M lines of code, with measures of the defect’s importance, the developer-written patch’s complexity, and the quality of the test suite. We then analyze relationships between these measures and the ability to produce patches for the defects of seven automated repair techniques —AE, GenProg, Kali, Nopol, Prophet, SPR, and TrpAutoRepair. We find that automated repair techniques are less likely to produce patches for defects that required developers to write a lot of code or edit many files, or that have many tests relevant to the defect. Java techniques are more likely to produce patches for high-priority defects. Neither the time it took developers to fix a defect nor the test suite’s coverage correlate with the automated repair techniques’ ability to produce patches. Finally, automated repair techniques are less capable of fixing defects that require developers to add loops and new function calls, or to change method signatures. These findings identify strengths and shortcomings of the state-of-the-art of automated program repair along new dimensions. The presented methodology can drive research toward improving the applicability of automated repair techniques to hard and important bugs. 相似文献
9.
Yuriy I. Aristov 《传热工程》2014,35(11-12):1014-1027
This review addresses recent advances in understanding and trends in studying dynamics in adsorptive heat transformers (AHTs), which are considered as an alternative to common compression and absorption machines. Experimental data have been obtained mainly by a new large temperature jump method (LTJM) specifically developed to imitate the conditions of isobaric stages of AHTs. Here we consider merely a simple but quite realistic configuration of an “adsorbent–heat exchanger” (Ad-HEx) with n-layers of loose adsorbent grains (n = 1–8). Water, methanol, and ammonia are used as adsorbates. Several recommendations following from this experimental study have been checked with prototypes of adsorptive chiller in ITAE-CNR (Italy) and the University of Warwick (UK). These tests clearly demonstrated that the dynamic performance of AHT can be significantly improved by a proper management of AHT cycle and Ad-HEx geometry. The most important findings and general regularities that have been revealed by systematic studying of the adsorption dynamics of water, methanol, and ammonia in AHT systems are summarized, illustrated, and discussed in this review. 相似文献
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