4,010 research outputs found
Editorial for special issue on neurodynamics
No full text“Neurodynamics” is an interdisciplinary area of mathematics where dynamical systems theory (deterministic and stochastic) is the primary tool for elucidating the fundamental mechanisms responsible for the behaviour of neural systems (whether biological or synthetic). A meeting on this topic was held at the International Centre for Mathematical Sciences in Edinburgh from March 5–7 in 2012. In this special issue, we have invited seven of the main contributors to this event to expand on their presentations and highlight the use of mathematics in understanding the dynamics of neural systems
Lattice study of ((D)over-bar(1)D*)(+/-) near-threshold scattering
No full textIn this exploratory lattice study, low-energy near threshold scattering of the ((D) over bar D-1*)(+/-) meson system is analyzed using lattice QCD with N-f = 2 twisted mass fermion configurations. Both s-wave (J(P) = 0(-)) and p-wave (J(P) = 1(+)) channels are investigated. It is found that the interaction between the two charmed mesons is attractive near the threshold in both channels. This calculation provides some hints in the searching of resonances or bound states around the threshold of ((D) over bar D-1*)(+/-) system.National Science Foundation of China (NSFC) [11335001, 11275169, 11075167, 11105153, 11505132, 11261130311]; Deutsche Forschungsgemeinschaft (DFG); Scientific Research Program - Shanxi Provincial Education Department [15JK1348]SCI(E)[email protected]
Firm R&D, Absorptive Capacity and Learning by Exporting: Firm-level Evidence from China
No full textThe absorptive capacity of firms developed through R&D promotes learning by exporting. In this paper, we estimate the instantaneous and long-run productivity effects of exporting on the universe of Chinese manufacturing firms. We find that exporting has very different productivity effects for firms with different pre-export R&D status. It has large and lasting productivity effects for firms with pre-export R&D, while it has little effects for firms without pre-export R&D. Furthermore, the effect of exporting increases with the number of years of pre-export R&D investment.Business, FinanceEconomicsInternational RelationsSSCI0ARTICLE91131-11453
Z(c)(3900) as a (D)over-barD* molecule from the pole counting rule
No full textA comprehensive study on the nature of the Zc(3900) resonant structure is carried out in this work. By constructing the pertinent effective Lagrangians and considering the important final-state-interaction effects, we first give a unified description to all the relevant experimental data available, including the J/psi pi and pi invariant mass distributions from the e(+)e(-) -> J/psi pi process, the h(c)pi distribution from e(+)e(-) -> h(c)pi pi, and also the D (D) over bar* spectrum in the e(+)e(-) -> D (D) over bar*pi process. After fitting the unknown parameters to the previous data, we search the pole in the complex energy plane and find only one pole in the nearby energy region in different Riemann sheets. Therefore, we conclude that Z(c)(3900) is of D (D) over bar* molecular nature, according to the pole counting rule method [Nucl. Phys. A543, 632 (1992); Phys. Rev. D 35, 1633 (1987)]. We emphasize that the conclusion based upon the pole counting method is not trivial, since both the D (D) over bar* contact interactions and the explicit Z(c) exchanges are introduced in our analyses andNational Nature Science Foundations of China (NSFC) [10925522, 11021092, 11575052, 11105038]; Natural Science Foundation of Hebei Province [A2015205205]; inoGerman Collaborative Research Center "Symmetries and the Emergence of Structure in QCD" [CRC 110]; DFG; NSFCSCI(E)ARTICLE119
Characteristics of Self-Citation in Journal of Natural Rubber Research 1988-1997: a Ten-Year Bibliometric Study
No full textAnalyses the extent of journal self-citation and author self-citation in the research articles and short communications published in Journal of Natural Rubber Research during 1988 to 1997. Results show that 53% of articles contained journal self-citations; the rate of journal self-citations per article ranges between 1 to 12; a high percentage of authors (61.4%) contributing articles to the journal cited themselves; a tendency is noticed for authors affiliated to the institution publishing the journal to cite the journal; the highest self-citing author is A. D. Roberts
“He Was the Only Professor for Us...”: Yu. M. Lotman – Teacher and Scholar
No full textThe article presents an interview of I. Z. Belobrovtseva, characterizing the personality of Yu. M. Lotman as well as the significance of his works for structural semiotics in literary criticism of the 20th century. Irina Zakharovna Belobrovtseva is an Estonian specialist in literary studies, Doctor of Philology, Professor of Russian Literature at the Institute for the Humanities of Tallinn University, Laureate of the Estonian State Prize in Science. Her research interests are Russian literature and culture of the 20th – 21st centuries, Estonian literature and culture, Russian literature of Estonia. She is author of the following books: “Over the Blank Page Alone and with Hope: Articles on Contemporary Estonian Literature” (1987), “Reading Poetry Together: A Guide for Teachers” (1994), “Mikhail Bulgakov’s Novel “Master and Margarita”: Constructive Principles of Text Organization” (1997), “Mikhail Bulgakov’s Novel “The Master and Margarita”. Commentary.” (co-authored with S. Kulyus, 2004, 2006, 2007), “The Image of a "Small Enemy": the Baltic States and Poland in the Mirror of Soviet Caricature (1918–1940)” (co-authored with D. Vseviov, A. Danilevsky, 2014), “Leonid Zurov. In the Shadow of Bunin” (2020) and others
Continuity In Banach Spaces
No full textThe main theme of this document and much of the author's research so far is to use porosity (as well as category) to describe how typical a variety of continuity conditions are within certain collections of functions. The intuition behind the work is that ``most things should behave according to a pattern or principle of action''. The pattern that the author has in mind is that things should: flow, be localized, and oscillate. Indeed, this theme occurs throughout the authors included work. As a side note: the reader with a very particular background and side interest may recognize these three principles as Yu-Won-Hwa, an observation that will help with understanding future naming conventions. In Chapter 1, we study what properties a typical bounded real valued derivative possesses, in terms of continuity. We first prove results for finite dimensional domains. Additionally, we obtain some results when the domain is a subset of a general Banach space with a Frechet differentiable norm. In Chapter 2, we study porosity in relation to bounded variation. In particular, we show that when we suitably norm the space of functions with bounded variation, then the Cantor function becomes the typical example of a function in that space. In Chapter 3, we study how typical (in the sense of both category and porosity) it is for a function that is twice partial differentiable to have equal mixed partial derivatives. As it turns out, the ability to satisfy Clairaut's Theorem is infrequent. In Chapter 4, we study a general condition that implies we have an open, dense, co-porous set whenever we are looking at a set defined by a seminorm in a particular way. This allows us to prove a number of unifying results (without having to individually go through many cases involving much calculation). In Chapter 5, we introduce a few open questions that the author has recently been working on directly, or has formulated for further study. In the Appendix, we introduce the concept of porosity in an easy to follow format, with illustrative diagrams to guide the reader in their pursuit of intuition
Current susceptibility of magnetization in spin valves
No full textWe observed the second harmonic voltage response of pseudo-spin valves subjected to currents oscillating at frequencies in the sub-kilohertz range. Peaks appear in its magnetic field dependence, with a signal-to-noise ratio equal to or greater than the magnetoresistance response of the same samples. This signal is interpreted as arising from the response of the magnetization to the spin torque induced by current when the magnetic layers are in non-collinear orientations. Thus, the method probes the current susceptibility of the magnetization which is shown to be sensitive to non-collinear states undetectable in the magnetoresistance.LPM
The etiology of esophageal cancer in high- and low- risk areas of Jiangsu province, China
No full text [Background]Esophageal cancer (EC) remains one of the most common and fatal malignancies worldwide. The geographic variation in EC occurrence is striking, and China is an area with one of the highest incidences of EC. A number of epidemiological studies have been conducted toward EC in the past decades, results suggested that tobacco smoking, alcohol drinking, unhealthy dietary factors and chronic injuries of the esophageal mucosa are important in the development of this disease. Genetic polymorphisms in enzymes involved in metabolism of carcinogens may also influence individual susceptibility. However, the effects of major lifestyle and hereditary risk factors on the development of EC remain poorly understood in China. Moreover, little attention has been paid to the etiological heterogeneity between similar areas with great risk gradient. [Methods]From 2003 to 2007, a large population-based case-control study of EC has been conducted in a selected high-risk area and a selected low-risk area of Jiangsu Province, one of the highest cancer incidence areas in China. In total, 1,520 cases and 3,879 controls were recruited. In this thesis, we evaluated the role of major lifestyle factors such as tobacco smoking, alcohol drinking and dietary factors, as well as inherited determinants including family history of cancer and genetic polymorphisms of alcohol-metabolizing related genes on the risk of EC. In addition, we investigated how much of the risk gradient between two areas could be explained by variation in the distributions of major risk factors. [Results] Tobacco smoking and alcohol drinking moderately increased the risk of EC, while the positive associations were only found among men but not among women. Dietary factors were observed to play important roles in the development of EC. Specific dietary habits i.e., fast eating speed, and hot eating and/or drinking substantially elevated EC risk and could explain more than 20% of EC cases each. High intake of salty foods and fried foods, low consumption of raw garlic were also observed to increase the risk of EC. In addition to environmental and lifestyle factors, we confirmed that a positive family history can significantly increase EC risk, and found the inheritance may modify the effect of some unhealthy lifestyles. Moreover, we further explored the relationship between EC and single nucleotide polymorphismsof ADH1B, ADH1C and ALDH2 genes. Results showed that the slow metabolizing ADH1B G allele, ADH1C G allele and ALDH2 A allele significantly increased EC risk among moderate-to-heavy alcohol drinkers, and a significant interaction was observed between ALDH2 gene and alcohol consumption. Lastly, we found that more than 60% of EC cases could be attributable to major lifestyle risk factors in the study population; furthermore, dissimilar distribution of several lifestyle factors, together with variations of hereditary factors may be largely responsible for the incidence difference between two study areas. [Conclusion]The findings in this thesis confirm that unhealthy lifestyles including smoking, alcohol drinking and some dietary factors are the predominant risk factors of EC in China, and a large proportion of incidence difference between regions at varying risk could be attributed to the different prevalence of lifestyle factors. As most of the identified risk factors are modifiable, these could be translated into risk reduction prevention programs in China, and a substantial proportion of new EC cases are expected to be prevented by eliminating or avoiding these risk factors in the population. </p
Stability of polytopic polynomial matrices
No full textThis paper gives a necessary and sufficient condition for robust D-stability of Polytopic Polynomial Matrices.Wang, Long; Wang, Zhizhen; Yu, Wensheng. (2002). Stability of polytopic polynomial matrices. Retrieved from the University Digital Conservancy, https://hdl.handle.net/11299/3744
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