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Now showing items 1 - 16 of 76

  • Vibrational Coupling and Kapitza Resistance at a Solid–Liquid Interface

    Song Ge   Min Chen  

    The rapid development and application of nanotechnologies have promoted an increasing interest in research on heat transfer across the solid/liquid interface. In this study, molecular dynamics simulations are carried out to elucidate the effect of vibrational coupling between the solid and the liquid phases on the Kapitza thermal resistance. This is accomplished by altering the atomic mass and interatomic interaction strength in the solid phase (thus, the vibrational properties), while keeping the solid-liquid interfacial interaction unchanged. In this way, the Kapitza resistance can be altered with a constant work of adhesion between the solid and the liquid phases. The simulation results show that the overlap degree between the vibrational density of states profiles of the interfacial liquid layer and the outermost solid layer, which measures the degree of interfacial vibrational coupling, increases with larger atomic mass and weaker inter-atomic interaction in the solid phase. An inverse relation exists between the Kapitza resistance and the overlap degree of the vibrational density of states profiles. It means that the Kapitza resistance decreases with better interfacial vibrational coupling. The simulations show that the Kapitza resistance is not only affected by the interfacial bonding strength but also the vibrational coupling between the solid and the liquid atoms. The interfaces with better thermal transport efficiency should be the ones with stronger interfacial interaction and preferable vibrational coupling between solid and liquid phases.
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  • A Dynamic Ensemble Framework for Mining Textual Streams with Class Imbalance

    Song Ge   Ye Yunming  

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  • Collapse process and impact effect of viaduct demolition based on centrifugal model

    Song Ge   Zhong Ming-shou   Wang Min   Long Yuan   Liu Ying   Xu Jing-lin  

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  • A Molecular Dynamics Simulation of the Diffusivity of O2in Supercritical Water

    Song Ge   Xiang-Xiong Zhang   Min Chen  

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  • Variability and adaptability of Miscanthus species evaluated for energy crop domestication

    JUAN YAN   WENLI CHEN   FAN LUO   HONGZHENG MA   AIPING MENG   XINWEI LI   MING ZHU   SHANSHAN LI   HAIFEI ZHOU   WEIXING ZHU   BIN HAN   SONG GE   JIANQIANG LI and TAO SANG  

    A growing body of evidence indicates that second-generation energy crops can play an important role in the development of renewable energy and the mitigation of climate change. However, dedicated energy crops have yet to be domesticated in order to fully realize their productive potential under unfavorable soil and climatic conditions. To explore the possibility of domesticating Miscanthus crops in northern China where marginal and degraded land is abundant, we conducted common garden experiments at multiple locations to evaluate variation and adaptation of three Miscanthus species that are likely to serve as the wild progenitors of the energy crops. A total of 93 populations of Miscanthus sinensis, Miscanthus sacchariflorus, and Miscanthus lutarioriparius were collected across their natural distributional ranges in China and grown in three locations that represent temperate grassland with cold winter, the semiarid Loess Plateau, and relatively warm and wet central China. Evaluated with growth traits such as plant height, tiller number, tiller diameter, and flowering time, the Miscanthus species showed high levels of genetic variation within and between species. There were significant site × population interactions for almost all traits of M. sacchariflorus and M. sinensis, but not M. lutarioriparius. The northern populations of M. sacchariflorus had the highest establishment rates at the most northern site owing to their strong cold tolerance. An endemic species in central China, M. lutarioriparius, produced not only the highest biomass of the three species but also higher biomass at the Loess Plateau than the southern site near its native habitats. These results demonstrated that the wild species harbored a high level of genetic variation underlying traits important for crop establishment and production at sites that are colder and drier than their native habitats. The natural variation and adaptive plasticity found in the Miscanthus species indicated that they could provide valuable resources for the development of second-generation energy crops.
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  • A Molecular Dynamics Simulation of the Diffusivity of O2 in Supercritical Water

    Song Ge   Xiang-Xiong Zhang and Min Chen  

    Equilibrium molecular dynamics simulations were carried out to study the diffusion process of oxygen in supercritical water (SCW). Both infinite-dilution diffusion and Maxwell–Stefan (MS) mutual diffusion coefficients were calculated. The differences between the simulated Maxwell–Stefan diffusion coefficients and those predicted by the Darken equation were examined. It suggests that the velocity cross correlation function plays an important role in the oxygen–SCW mutual diffusion. The Darken equation may not be valid in predicting the Maxwell–Stefan diffusion coefficients for this mixture.
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  • Error report processing using call stack similarity

    Techniques for error report processing are described herein. Error reports, received by a developer due to program crashes, may be organized into a plurality of “buckets.” The buckets may be based in part on a name and a version of the application associated with a crash. Additionally, a call stack of the computer on which the crash occurred may be associated with each error report. The error reports may be “re-bucketed” into meta-buckets to provide additional information to programmers working to resolve software errors. The re-bucketing may be based in part on measuring similarity of call stacks of a plurality of error reports. The similarity of two call stacks—a measure of likelihood that two error reports were caused by a same error—may be based in part on functions in common, a distance of those functions from the crash point, and an offset distance between the common functions.
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  • A Phylogeny of the Rice Tribe Oryzeae (Poaceae) Based on matK Sequence Data

    Song Ge   Ang Li   Bao-Rong Lu   Shou-Zhou Zhang and De-Yuan Hong  

    Phylogenetic relationships were inferred using nucleotide sequences of the chloroplast gene matK for 26 species representing I I genera of the tribe Oryzeae and three outgroup species. The sequenced fragments varied from 1522 base pairs (bp) to 1534 bp in length with 15.4% variable and 7.9% phylogenetically informative sites when the outgroups were excluded. The aligned sequences were analyzed by maximum parsimony and neighbor-joining methods. Analyses of the sequence data indicated that species of Oryzeae form a strongly supported monophyletic group, concordant with previous morphological and anatomical evidence. The tribe Oryzeae can be divided into two monophyletic lineages, corresponding to the traditionally recognized subtribes Oryzinae and Zizaniinae. The first subtribe consists of Oryza and Leersia, while the subtribe Zizaniinae includes the remaining genera. The matK sequence data did not support the close affinities of the monoecious genera in Oryzeae, implying the possibility of multiple origins of the floral structures in the tribe. It is noteworthy that Porteresia coarctata is closely related to Oryza species, suggesting that it should be treated as a member in the genus Oryza rather than a separate monotypic genus.
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  • Divergent evolution of oxidosqualene cyclases in plants

    Zheyong Xue   Lixin Duan   Dan Liu   Jie Guo   Song Ge   Jo Dicks   Paul ÓMáille   Anne Osbourn and Xiaoquan Qi  

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  • Error report processing using call stack similarity

    Techniques for error report processing are described herein. Error reports, received by a developer due to program crashes, may be organized into a plurality of “buckets.” The buckets may be based in part on a name and a version of the application associated with a crash. Additionally, a call stack of the computer on which the crash occurred may be associated with each error report. The error reports may be “re-bucketed” into meta-buckets to provide additional information to programmers working to resolve software errors. The re-bucketing may be based in part on measuring similarity of call stacks of a plurality of error reports. The similarity of two call stacks—a measure of likelihood that two error reports were caused by a same error—may be based in part on functions in common, a distance of those functions from the crash point, and an offset distance between the common functions.
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  • Phylogeny of Rice Genomes with Emphasis on Origins of Allotetraploid Species

    Song Ge   Tao Sang   Bao-Rong Lu and De-Yuan Hong  

    The rice genus, Oryza, which comprises 23 species and 9 recognized genome types, represents an enormous gene pool for genetic improvement of rice cultivars. Clarification of phylogenetic relationships of rice genomes is critical for effective utilization of the wild rice germ plasm. By generating and comparing two nuclear gene (Adh1 and Adh2) trees and a chloroplast gene (matK) tree of all rice species, phylogenetic relationships among the rice genomes were inferred. Origins of the allotetraploid species, which constitute more than one-third of rice species diversity, were reconstructed based on the Adh gene phylogenies. Genome types of the maternal parents of allotetraploid species were determined based on the matK gene tree. The phylogenetic reconstruction largely supports the previous recognition of rife genomes. It further revealed that the EE genome species is most closely related to the DD genome progenitor that gave rise to the CCDD genome. Three species of the CCDD genome may have originated through a single hybridization event, and their maternal parent had the CC genome. The BBCC genome species had different origins, and their maternal parents had either a BE or CC genome. An additional genome type, HHKK, was recognized for Oryza schlechteri and Porteresia coarctata, suggesting that P, coarctata is an Oryza species. The AA genome lineage, which contains cultivated rice, is a recently diverged and rapidly radiated lineage within the rice genus.
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  • The prognostic value of nodal skip metastasis in resectable thoracic esophageal squamous cell carcinoma

    Song Ge   Jing Wang   Xue Song   Guo Hongbo   Yu Jinming  

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  • Correction to “K Nearest Neighbour Joins for Big Data on MapReduce: A Theoretical and Experimental Analysis”

    Song Ge   Rochas Justine   El Beze Lea   Huet Fabrice   Magoules Frederic  

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  • Allozyme Variation in Ophiopogon xylorrhizus, an Extreme Endemic Species of Yunnan, China

    Song Ge   Da-Ming Zhang   Hai-Qun Wang and Guang-Yuan Rao  

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  • Development of a remanence measurement-based SQUID system with in-depth resolution for nanoparticle imaging

    Song Ge   Xiangyang Shi   James R Baker Jr   Mark M Banaszak Holl   Bradford G Orr  

    We present a remanence measurement method using a superconducting quantum interference device (SQUID) to detect trace amounts of magnetic nanoparticles (MNPs). Based on this method, a one-dimensional scanning system was established for imaging. The system was calibrated with 25 nm diameter Fe2O3 nanoparticles (NPs), and the sensitivity of the NPs was found to be 10 ng at a distance of 1.7 cm and the spatial resolution was ~1 cm. A theoretical model of this system was developed and applied to the deconvolution of scanned images of phantoms with two NP injection spots. Using the developed SQUID system, we were able to determine not only the amount and horizontal positions of the injections, but also their depths in the phantoms.
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  • Membership-Function-Dependent Stability Analysis of Interval Type-2 Polynomial Fuzzy-Model-Base Control Systems

    Song Ge   Lam Hak-Keung   Yang Xiaozhan  

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