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Search Results: 1 - 10 of 131082 matches for " LI Ba-Ao "
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PHOTOLUMINESCENCE AND RAMAN SCATTERING SPECTROSCOPIES OF MBE-GROWN Hg0.68Cd0.32Te EPILAYER
分子束外延Hg0.68Cd0.32Te薄膜光致发光和喇曼散射的研究

JI Rong-Bin,WANG Shan-Li,YANG Jian-rong,YU Mei-Fang,QIAO Yim-YI,CHANG Yong,LI Ba-Ao,HE Li,
姬荣斌
,王善力

红外与毫米波学报 , 1998,
Abstract: Using photoluminescence (PL) and Raman scattering (RS), the MBE grown Hg 1- x Cd x Te ( x =0.325) epilayers were studied. The PL measurement shows a strong near band emission peak with a FWHM of 5meV, which indicates high crystal quality obtained. Three peaks, the relatively strong HgTe like TO mode at 119cm -1 and HgTe like LO at 139cm -1 and a weak LA mode at 93cm -1 , were observed on RS spectra. The weak peak at 93cm -1 has not been reported previously. The assignment of the peak is based on the comparison with the result of far infrared transmittance spectra(FIT).
Preliminary Multivariate Analysis of the Factors of Socio- Economic Development of Nigeria - A Case Study of Delta State of Nigeria
BA Ugbomeh, AO Atubi
African Research Review , 2010,
Abstract: The paper examined the socio-economic factors of development in the Delta state of Nigeria. The major source of data is secondary and the statistical technique is the step-wise multiple regression. The household income was used as an index of development while the socio-economic variables included population, education, and employment, capital water projects, housing unit, health centres, industries and police station. Four key socio-economic variables of population, health centres, employment and capital water projects were identified as being responsible for 80% of the variation in the development of Delta state of Nigeria among other variables. Solutions to identified problems were proffered.
Case Report: Proximal focal femoral deficiency in Ibadan a developing Country's perspective and a review of the literature
AO Ifesanya, BA Omololu
Nigerian Journal of Paediatrics , 2012,
Abstract: Proximal focal femoral deficiency (PFFD) is a rare but often severe abnormality of the lower limb which poses a significant challenge to effective treatment. We reviewed 21 patients with 23 cases of PFFD treated in our centre in the 14-year period from 1997 to 2010. The male:female ratio was 1:2 and the right femur was more commonly involved. Coincident congenital malformations were identified in four patients (19%), all involving the limbs. Conservative management was Employed for all our patients due to nonavailability of limb lengthening facilities. The cultural aversion to amputation in our environment makes it difficult to employ that option of treatment. Proximal focal femoral deficiency in Ibadan a developing country's perspective and a review of the literature.
Proximal Focal Femoral Deficiency in Ibadan a Developing Country's Perspective and a Review of the Literature
AO Ifesanya, BA Omololu
Nigerian Journal of Paediatrics , 2011,
Abstract: Proximal focal femoral deficiency (PFFD) is a rare but often severe abnormality of the lower limb which poses a significant challenge to effective treatment. We reviewed 21 patients with 23 cases of PFFD treated in our centre in the 14-year period from 1997 to 2010. The male:female ratio was 1:2 and the right femur was more commonly involved. Coincident congenital malformations were identified in four patients (19%), all involving the limbs . Conservative management was employed for all our patients due to non - availability of limb lengthening facilities. The cultural aversion to amputation in our environment makes it difficult to employ that option of treatment. Proximal focal femoral deficiency in Ibadan a developing country's perspective and a review of the literature.
Wound dehiscences following cataract surgery in children: a report of seven cases
AO Ashaye, BA Olusanya
Nigerian Journal of Paediatrics , 2006,
Abstract:
An Effective Tri-Clustering Algorithm Combining Expression Data with Gene Regulation Information
Ao Li and David Tuck
Gene Regulation and Systems Biology , 2012,
Abstract: Motivation: Bi-clustering algorithms aim to identify sets of genes sharing similar expression patterns across a subset of conditions. However direct interpretation or prediction of gene regulatory mechanisms may be difficult as only gene expression data is used. Information about gene regulators may also be available, most commonly about which transcription factors may bind to the promoter region and thus control the expression level of a gene. Thus a method to integrate gene expression and gene regulation information is desirable for clustering and analyzing. Methods: By incorporating gene regulatory information with gene expression data, we define regulated expression values (REV) as indicators of how a gene is regulated by a specific factor. Existing bi-clustering methods are extended to a three dimensional data space by developing a heuristic TRI-Clustering algorithm. An additional approach named Automatic Boundary Searching algorithm (ABS) is introduced to automatically determine the boundary threshold. Results: Results based on incorporating ChIP-chip data representing transcription factor-gene interactions show that the algorithms are efficient and robust for detecting tri-clusters. Detailed analysis of the tri-cluster extracted from yeast sporulation REV data shows genes in this cluster exhibited significant differences during the middle and late stages. The implicated regulatory network was then reconstructed for further study of defined regulatory mechanisms. Topological and statistical analysis of this network demonstrated evidence of significant changes of TF activities during the different stages of yeast sporulation, and suggests this approach might be a general way to study regulatory networks undergoing transformations.
An Effective Tri-Clustering Algorithm Combining Expression Data with Gene Regulation Information
Ao Li,David Tuck
Gene Regulation and Systems Biology , 2009,
Abstract: Motivation: Bi-clustering algorithms aim to identify sets of genes sharing similar expression patterns across a subset of conditions. However direct interpretation or prediction of gene regulatory mechanisms may be difficult as only gene expression data is used. Information about gene regulators may also be available, most commonly about which transcription factors may bind to the promoter region and thus control the expression level of a gene. Thus a method to integrate gene expression and gene regulation information is desirable for clustering and analyzing.Methods: By incorporating gene regulatory information with gene expression data, we define regulated expression values (REV) as indicators of how a gene is regulated by a specific factor. Existing bi-clustering methods are extended to a three dimensional data space by developing a heuristic TRI-Clustering algorithm. An additional approach named Automatic Boundary Searching algorithm (ABS) is introduced to automatically determine the boundary threshold.Results: Results based on incorporating ChIP-chip data representing transcription factor-gene interactions show that the algorithms are efficient and robust for detecting tri-clusters. Detailed analysis of the tri-cluster extracted from yeast sporulation REV data shows genes in this cluster exhibited significant differences during the middle and late stages. The implicated regulatory network was then reconstructed for further study of defined regulatory mechanisms. Topological and statistical analysis of this network demonstrated evidence of significant changes of TF activities during the different stages of yeast sporulation, and suggests this approach might be a general way to study regulatory networks undergoing transformations.
An Effective Tri-Clustering Algorithm Combining Expression Data with Gene Regulation Information
Ao Li,David Tuck
Gene Regulation and Systems Biology , 2009,
Abstract: Motivation: Bi-clustering algorithms aim to identify sets of genes sharing similar expression patterns across a subset of conditions. However direct interpretation or prediction of gene regulatory mechanisms may be difficult as only gene expression data is used. Information about gene regulators may also be available, most commonly about which transcription factors may bind to the promoter region and thus control the expression level of a gene. Thus a method to integrate gene expression and gene regulation information is desirable for clustering and analyzing. Methods: By incorporating gene regulatory information with gene expression data, we define regulated expression values (REV) as indicators of how a gene is regulated by a specific factor. Existing bi-clustering methods are extended to a three dimensional data space by developing a heuristic TRI-Clustering algorithm. An additional approach named Automatic Boundary Searching algorithm (ABS) is introduced to automatically determine the boundary threshold. Results: Results based on incorporating ChIP-chip data representing transcription factor-gene interactions show that the algorithms are efficient and robust for detecting tri-clusters. Detailed analysis of the tri-cluster extracted from yeast sporulation REV data shows genes in this cluster exhibited significant differences during the middle and late stages. The implicated regulatory network was then reconstructed for further study of defined regulatory mechanisms. Topological and statistical analysis of this network demonstrated evidence of significant changes of TF activities during the different stages of yeast sporulation, and suggests this approach might be a general way to study regulatory networks undergoing transformations.
Temperature- and thickness-dependent elastic moduli of polymer thin films
Ao Zhimin,Li Sean
Nanoscale Research Letters , 2011,
Abstract: The mechanical properties of polymer ultrathin films are usually different from those of their counterparts in bulk. Understanding the effect of thickness on the mechanical properties of these films is crucial for their applications. However, it is a great challenge to measure their elastic modulus experimentally with in situ heating. In this study, a thermodynamic model for temperature- (T) and thickness (h)-dependent elastic moduli of polymer thin films Ef(T,h) is developed with verification by the reported experimental data on polystyrene (PS) thin films. For the PS thin films on a passivated substrate, Ef(T,h) decreases with the decreasing film thickness, when h is less than 60 nm at ambient temperature. However, the onset thickness (h*), at which thickness Ef(T,h) deviates from the bulk value, can be modulated by T. h* becomes larger at higher T because of the depression of the quenching depth, which determines the thickness of the surface layer δ.
Non-Fermi-liquid behavior in cubic phase BaRuO$_{3}$: A dynamical mean-field study
Li Huang,Bingyun Ao
Physics , 2012, DOI: 10.1103/PhysRevB.87.165139
Abstract: Motivated by the recently synthesized cubic phase BaRuO$_{3}$ under high pressure and high temperature, a thorough study has been conducted on its temperature-dependent electronic properties by using the state-of-the-art \textit{ab inito} computing framework of density functional theory combined with dynamical mean-field theory. At ambient condition the cubic phase BaRuO$_{3}$ should be a weakly correlated Hund's metal with local magnetic moment. The spin-spin correlation function and local magnetic susceptibility can be well described by the Curie-Weiss law over a wide temperature range. The calculated low-frequency self-energy functions of Ru-4d states apparently deviate from the behaviors predicted by Landau Fermi-liquid theory. Beyond that, the low-frequency optical conductivity can be fitted to a power-law $\Re\sigma(\omega) \sim \omega^{-0.98}$, which further confirms the Non-Fermi-liquid metallic state.
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