1,725,679 research outputs found
Exact results for the first-passage properties in a class of fractal networks
No full textIn this work, we consider a class of recursively grown fractal networks Gn(t) whose topology is controlled by two integer parameters, t and n. We first analyse the structural properties of Gn(t) (including fractal dimension, modularity, and clustering coefficient), and then we move to its transport properties. The latter are studied in terms of first-passage quantities (including the mean trapping time, the global mean first-passage time, and Kemeny’s constant), and we highlight that their asymptotic behavior is controlled by the network’s size and diameter. Remarkably, if we tune n (or, analogously, t) while keeping the network size fixed, as n increases ( t decreases) the network gets more and more clustered and modular while its diameter is reduced, implying, ultimately, a better transport performance. The connection between this class of networks and models for polymer architectures is also discussed
Scaling laws for diffusion on (trans)fractal scale-free networks
Get PDFFractal (or transfractal) features are common in real-life networks and are known to in
uence the dynamic processes taking place in the network itself. Here we consider a class of scale-free
deterministic networks, called (u; v)-owers, whose topological properties can be controlled by tuning
the parameters u and v; in particular, for u > 1, they are fractals endowed with a fractal dimension
df , while for u = 1, they are transfractal endowed with a transfractal dimension ~ df . In this work
we investigate dynamic processes (i.e., random walks) and topological properties (i.e., the Laplacian
spectrum) and we show that, under proper conditions, the same scalings (ruled by the related
dimensions), emerge for both fractal and transfractal
Light People: Academician Junhao Chu
No full textEditorial The industrial revolutions of steam power, electric power and digital power have been three key steps in the development of science and technology. Now, the fourth industrial revolution has quietly begun, a revolution which will combine the powers of modern technologies such as the Internet, industrial digitalization and virtual reality to trigger a major change of science and technology, and sensor technology is of vital importance to this process. A famous physicist specialized in infrared and semiconductors, our featured guest not only discovered the intrinsic absorption spectra of the optical transition between narrow gap semiconductor mercury cadmium telluride bands, but also developed the theory of the band structure of mercury cadmium telluride and the theory of optical transition, put forward a series of expressions such as the gap width of mercury cadmium telluride bands, making outstanding contributions. Born into a scholarly family, he inherited a love for knowledge, especially physics and enjoyed all the challenges it presented. In research, he believes that technological development should be guided by the laws of physics. As a teacher, he asks his students to focus on the depth and breadth of learning. In life, he is famed for being easygoing, modest, well-mannered and meticulous. He is Academician Junhao Chu of the Shanghai Institute of Technical Physics (SITP), Chinese Academy of Sciences (CAS). Please follow Light People and discover what challenges Prof. Chu had to overcome in the study of mercury cadmium telluride
The genus Zygoneura Meigen in China, with descriptions of three new species (Diptera, Sciaridae)
No full textZhang, Su-Jiong, Wu, Hong, Huang, Junhao (2010): The genus Zygoneura Meigen in China, with descriptions of three new species (Diptera, Sciaridae). Zootaxa 2368: 40-48, DOI: 10.5281/zenodo.19368
Going Beyond Counting First Authors in Author Co-citation Analysis
Get PDFThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
The genus Ctenosciara Tuomikoski in China, with descriptions of three new species (Diptera, Sciaridae)
No full textWu, Hong, Zhang, Su-Jiong, Huang, Junhao (2010): The genus Ctenosciara Tuomikoski in China, with descriptions of three new species (Diptera, Sciaridae). Zootaxa 2560: 42-50, DOI: 10.5281/zenodo.19701
Debate 3: Genetically Tested Embryos Expected to Have Mild Adult Disease Should Not Be Transferred <subtitle>Motion For – Author: Junhao Yan; Motion Against – Author: Michael Gabbett</subtitle>
No full textMOTION: For Next generation sequencing (NGS) technology has been widely used in the field of genetic diseases, mainly focusing on the diagnosis of genetic diseases, newborn screening, prenatal screening, preimplantation genetic test (PGT) and other fields such as the treatment of cancer. In the field of reproductive medicine, there are still some issues that engendered controversy about the application of PGT. On one hand, disputes over whether using PGT to treat late-onset diseases is ethical remain. On the other hand, some tested embryos are “available” to transfer, while others are “discarded” embryos that are “unavailable” because they are detected carrying certain genetic flaws. But there are still some embryos biopsied expected to have some genetic abnormality that might or not cause malfunction, including embryos with copy number variant of uncertain significance (VUS), embryos tested with adult-onset genetically anomalousness, embryos of balanced translocation as well as mosaic embryos. So how to dispose of this group of embryos in clinical practice is a hot issue up to now. In this debate, we reviewed the relevant case reports and original research combined with the joint consensus or committee opinion to state our proposition: embryos tested with possible abnormal genetic characteristics and thus expected to have mild adult disease should not be transferred. Parents undergoing PGT may wish to avoid the lifelong concern caused by the chance that their children may develop adult-onset conditions. The transfer of embryos expected to have mild adult disease is contrary to their original intention of seeking PGT treatment. Whether intentional or incidental, the discovery and request for transfer of embryos likely to result in the birth of offspring with health-affecting conditions pose ethical dilemmas for physicians and their staff, patients, and society. MOTION: AGAINST Preimplantation genetic testing provides couples with powerful reproductive choices. The technology allows individuals to avoid giving birth to children with significant health issues and developmental disability. Additionally, serious familial adult-onset conditions, such as predisposition to cancer or dementia, can be screened out of future generations. Polygenetic risk scores will be the next leap in genetic testing technology. This data can used to determine the chances of an embryo developing adult-onset conditions such as cardiovascular disease, diabetes, mental illness and even gout. This presentation argues that there is a limit at which society should stop screening embryos for disease and draws upon practical observations and well-accepted ethical frameworks to support the case
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