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Search Results: 1 - 10 of 25930 matches for " Qi Long "
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STRESS-INTENSITY FACTORS CALCULATED BY DISLOCATION THEORY

Long Qi-wei,

金属学报 , 1978,
Abstract: Based upon dislocation theory the stress intensity factors can be calculated. The dislocation density distribution function (?) (x) is easily obtained by solving the integral equation with the Chebyshev polynomials. Some stress intensity factors thus calculated for practical cases have been found to agree fairly well with the results obtained by the conventional fracture mechanics.
Survival ensembles by the sum of pairwise differences with application to lung cancer microarray studies
Brent A. Johnson,Qi Long
Statistics , 2011, DOI: 10.1214/10-AOAS426
Abstract: Lung cancer is among the most common cancers in the United States, in terms of incidence and mortality. In 2009, it is estimated that more than 150,000 deaths will result from lung cancer alone. Genetic information is an extremely valuable data source in characterizing the personal nature of cancer. Over the past several years, investigators have conducted numerous association studies where intensive genetic data is collected on relatively few patients compared to the numbers of gene predictors, with one scientific goal being to identify genetic features associated with cancer recurrence or survival. In this note, we propose high-dimensional survival analysis through a new application of boosting, a powerful tool in machine learning. Our approach is based on an accelerated lifetime model and minimizing the sum of pairwise differences in residuals. We apply our method to a recent microarray study of lung adenocarcinoma and find that our ensemble is composed of 19 genes, while a proportional hazards (PH) ensemble is composed of nine genes, a proper subset of the 19-gene panel. In one of our simulation scenarios, we demonstrate that PH boosting in a misspecified model tends to underfit and ignore moderately-sized covariate effects, on average. Diagnostic analyses suggest that the PH assumption is not satisfied in the microarray data and may explain, in part, the discrepancy in the sets of active coefficients. Our simulation studies and comparative data analyses demonstrate how statistical learning by PH models alone is insufficient.
Dose-Response Aligned Circuits in Signaling Systems
Long Yan, Qi Ouyang, Hongli Wang
PLOS ONE , 2012, DOI: 10.1371/journal.pone.0034727
Abstract: Cells use biological signal transduction pathways to respond to environmental stimuli and the behavior of many cell types depends on precise sensing and transmission of external information. A notable property of signal transduction that was characterized in the Saccharomyces cerevisiae yeast cell and many mammalian cells is the alignment of dose-response curves. It was found that the dose response of the receptor matches closely the dose responses of the downstream. This dose-response alignment (DoRA) renders equal sensitivities and concordant responses in different parts of signaling system and guarantees a faithful information transmission. The experimental observations raise interesting questions about the nature of the information transmission through DoRA signaling networks and design principles of signaling systems with this function. Here, we performed an exhaustive computational analysis on network architectures that underlie the DoRA function in simple regulatory networks composed of two and three enzymes. The minimal circuits capable of DoRA were examined with Michaelis-Menten kinetics. Several motifs that are essential for the dynamical function of DoRA were identified. Systematic analysis of the topology space of robust DoRA circuits revealed that, rather than fine-tuning the network's parameters, the function is primarily realized by enzymatic regulations on the controlled node that are constrained in limiting regions of saturation or linearity.
Production of large size single transient cavitation bubbles with tube arrest method

Chen Qi-Dai,Wang Long,

中国物理 B , 2004,
Abstract:
Ureteral Obstruction and Stent Thrombosis AfterEndovascular Treatment of Iliac Artery Aneurysm
Long Wang,Lin Qi,Zhengyan Tang
Urology Journal , 2011,
Abstract:
Improved Adaptive and Multi-group Parallel Genetic Algorithm Based on Good-point Set
Ruijiang Wang,Yihong Ru,Qi Long
Journal of Software , 2009, DOI: 10.4304/jsw.4.4.348-356
Abstract: This paper puts forward an adaptive genetic algorithm to solve the multi-group homogenization in the solution space. The use of good-point set approach improves the initial population, ensuring them a uniform distribution in the solution space. In the evolution, each population implements independent genetic operations (selection, good-point set crossover, and mutation). The introduction of adaptive operator makes crossover and mutation operator self-adaptive. As the algorithm adopts a strategy of retaining the best, a space compression strategy can be designed based on information entropy theory through the information of all sub-populations in the evolution process, which ensures the algorithmic stability and fast convergence to the global optimal solution. Furthermore, in order to explore the feasibility and effectiveness of the improved multi-group parallel algorithm, optimization tests are implemented on some of the typical multi-peak functions, and the results are compared with the analytic solution and optimal solution of basic GA. The outcome suggests that the global searching ability and convergence of the improved algorithm is far better than the basic one.
Geometric Phase of electrons due to the Spin-rotation Coupling in Rotating C$_{60}$ Molecules
Jian-Qi Shen,Shao Long He
Physics , 2003, DOI: 10.1103/PhysRevB.68.195421
Abstract: The rapidly rotational motion of C$_{60}$ molecules provides us with an ingenious way to test Mashhoon's spin-rotation coupling. The spin-rotation coupling of electrons in the rotating C$_{60}$ molecule is considered in the present letter. It is shown that the intrinsic spin (gravitomagnetic moment) of the electron that can be coupled to the time-dependent rotating frequency of rotating frame of reference (C$_{60}$ molecule) results in a geometric phase, which may be measured through the electronic energy spectra of C$_{60}$ molecules.
Preliminary Preparations: Scattering Problem of Double-layered Sphere Containing Left-handed Media
Jian Qi Shen,Yi Jin,Long Chen
Physics , 2003,
Abstract: In this paper, we present Mie coefficients of double-layered sphere and consider the scattering problem, including the topics on field distribution, electromagnetic cross section, extinction spectra as well as some potential peculiar properties arising from the presence of left-handed media. The formulation presented here can be easily generalized to cases of multiple-layered spheres.
Aharonov-Carmi effect and energy shift of valency electrons in rotating C_{60} molecules
Jian Qi Shen,Shao Long He
Physics , 2004,
Abstract: It is shown that the valency electrons in rapidly rotating C_{60} molecules acquire an Aharonov-Carmi (A-C) phase shift, which is proportional to the molecular angular velocity flux enclosed by the matter wave of valency electrons on the C_{60} molecular shell. The energy shift of the valency electrons due to both the molecular rapid rotation and the molecular A-C phase shift is calculated.
Teaching Research of Geology Field Courses: A Case Study from Wuhan University  [PDF]
Tao Wang, Long Cheng, Jun Xiao, Peng Qi, Jun Zeng, Wanrui Hu, Suifeng Wang
Creative Education (CE) , 2016, DOI: 10.4236/ce.2016.79128
Abstract: The geology field course is the fundamental course in geoscience education. It is an intensive course that applies classroom and laboratory training to solve geological problems in the field. Wuhan University has offered a geology field course for undergraduate students since the 1950s. This paper summarizes and analyzes the teaching research in aspects of field course location, teaching contents and teaching tools since 2010, when the site was changed from the city of Chibi to Zigui County near the Three Gorges reservoir region.
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