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Search Results: 1 - 10 of 8833 matches for " Tongxiang Gu "
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Performance Prediction Based on Statistics of Sparse Matrix-Vector Multiplication on GPUs  [PDF]
Ruixing Wang, Tongxiang Gu, Ming Li
Journal of Computer and Communications (JCC) , 2017, DOI: 10.4236/jcc.2017.56005
Abstract: As one of the most essential and important operations in linear algebra, the performance prediction of sparse matrix-vector multiplication (SpMV) on GPUs has got more and more attention in recent years. In 2012, Guo and Wang put forward a new idea to predict the performance of SpMV on GPUs. However, they didn’t consider the matrix structure completely, so the execution time predicted by their model tends to be inaccurate for general sparse matrix. To address this problem, we proposed two new similar models, which take into account the structure of the matrices and make the performance prediction model more accurate. In addition, we predict the execution time of SpMV for CSR-V, CSR-S, ELL and JAD sparse matrix storage formats by the new models on the CUDA platform. Our experimental results show that the accuracy of prediction by our models is 1.69 times better than Guo and Wang’s model on average for most general matrices.
CONVERGENCE THEORY OF MSD-CG METHOD FOR SPD PROBLEMS
对称正定问题多搜索方向共轭梯度法的收敛性理论

Gu Tongxiang,
谷同祥
,刘兴平,迟学斌

计算数学 , 2004,
Abstract: In this paper, we give the convergence and consistence theory of multiple search direction conjugate gradient method (see 10]) and give some upper bound estimations of iterative value and error of our method.
Ceramics for high level radioactive waste solidification
Li Wang,Tongxiang Liang
Journal of Advanced Ceramics , 2012, DOI: 10.1007/s40145-012-0019-8
Abstract: Several countries reprocess their nuclear spent fuel using the Purex process to recover U and Pu as MOX fuel. The high level radioactive waste (HLW) produced during this reprocessing is a complex mixture containing both radioactive (fission products, minor actinides) and non-radioactive elements. Since HLW shows high rate heat release and contains some long half-life and biologically toxic radionuclide, its treatment and disposal technology is complex, difficult and high cost. HLW treatment and disposal become a worldwide challenge and research focus. In order to minimize the potential long-term impact of HLW, studies on enhanced chemical separation processes of long-lived radionuclides are in progress. Two options are then envisaged for these separated radionuclides: (a) transmutation into short-lived or non-radioactive elements, (b) immobilization in highly durable ceramic matrix instead of borosilicate glass. In this paper, we briefly review the composition, structure, processing and product properties of some ceramic candidates for inert matrix fuels (IMF) and the immobilization of high level radioactive waste.
Electron theory analysis on formation of spheroidal carbide in vanadium-alloyed white cast iron
Yifu Ye,Tongxiang Fan,Yuxia Shang
Chinese Science Bulletin , 1997, DOI: 10.1007/BF03182630
Abstract: The other reasons are that the degree of diffusion aeolotropism of V and C atoms is much reduced and the interfacial energy difference among interfaces in crystal VC is mcuh smaller.
Electron theory analysis about the influence of Cr and Mn on the carbide spheroidization by heat treatment
Yifu Ye,Tongxiang Fan,Yuxia Shang
Chinese Science Bulletin , 1998, DOI: 10.1007/BF02884149
Abstract: It is found that the distribution of covalent electron pair number and covalent bond energy was nonuniform in carbides F3C, (Fe, Cr)3C and (Fe, Mn)3C, in which the energy difference between the strongest and the weakest bonds is very great. A criterion of covalent bond breaking during the heat treatment of M3C pattern carbide is presented as follows. If the heat energy Ew, from heat treatment is higher than the diffusion activation energyQ of carbon atom in γ-Fe, the less the covalent bond energy Eα, is, the earlier the covalent bond a will be broken. According to the criterion, why the breaking of (Fe, Mn)3C network was easier than that of Fe3C network and why the breaking of (Fe, Cr)3C network was more difficult than that of Fe3C network are explained. It is indicated that Mn promoted the carbide to be spheroidized and Cr hindered the carbide from spheroidization during the heat treatment of carbides spheroidlzation.
The Current Treatment and Prevention of Post Herpetic Neuralgia  [PDF]
Simant Ankit, Tongxiang Zeng, Yangxin Chen, Hari Narayan Gupta, Kunal Shah, Xianwang Wang
Yangtze Medicine (YM) , 2018, DOI: 10.4236/ym.2018.21003
Abstract: Post herpetic neuralgia (PHN) is a chronic neuropathic pain syndrome in the area of the herpes zoster (HZ) rash, persisting after the cutaneous lesions have subsided. Despite numerous treatment advances, many patients remain refractory to the current therapies and continue to have pain, physical, economical and psychological distress. In this review, we will focus on the current treatment and prevention of PHN.
Biogenic Hierarchical TiO2/SiO2 Derived from Rice Husk and Enhanced Photocatalytic Properties for Dye Degradation
Dalong Yang, Tongxiang Fan, Han Zhou, Jian Ding, Di Zhang
PLOS ONE , 2011, DOI: 10.1371/journal.pone.0024788
Abstract: Background Rice husk, an agricultural bioresource, is utilized as a non-metallic bio-precursor to synthesize biogenic hierarchical TiO2/SiO2 (BH-TiO2/SiO2) and the products are applied to dye degradation. Methodology/Principal Findings The as-prepared BH-TiO2/SiO2 samples are characterized by X-ray diffraction(XRD), X-ray photoelectron spectroscopy(XPS), nitrogen-adsorption measurement, UV-vis spectroscopy and electronic paramagnetic resonance (EPR). The results show that BH-TiO2/SiO2 possesses both anatase and rutile phases with amorphous SiO2 as background, which contains mesopore structure, and nitrogen derived from original rice husk is self-doped into the lattice. Besides, the light-harvesting within the visible-light range of BH-TiO2/SiO2 has been enhanced. Moreover, the catalytic activity of BH-TiO2/SiO2 has been proven by EPR, and both the photocatalytic activity and stability of BH-TiO2/SiO2 are improved as well, which has been illustrated by cycled degradation of methylene blue dye under irradiation. Conclusions/Significance This work provides a good way to combine natural hierarchical porous structure with synthetic material chemistry based on available biomass in the vast natural environment for the sustainable development of human society, and extends potentials of biomass in applications such as photocatalysts, sunlight splitting water and so forth.
Fabrication of Unimolecular Double-stranded DNA Microarrays on Solid Surfaces for Probing DNA-Protein/Drug Interactions
Jinke Wang,Tongxiang Li,Yunfei Bai,Yi Zhu,Zuhong Lu
Molecules , 2003, DOI: 10.3390/80100153
Abstract: We present a novel method for fabricating unimole cular double-stranded DNA microarrays on solid surfaces, which were used to probe sequence-specific DNA/protein interactions. For manufacturing the unimolecular double-stranded DNA microarrays, two kinds of special single-stranded oligonucleotides, constant oligonucleotide and target oligonucleotide, were chemically synthesized. The constant oligonucleotides with internal aminated dT were used to capture and immobilize the target oligonucleotides onto the solid surface, and also to provide a primer for later enzymatic extension reactions, while target oligonucleotides took the role of harbouring DNA-binding sites of DNA-binding proteins. The variant target oligonucleotides were annealed and ligated with the constant oligonucleotides to form the new unimolecular oligonucleotides for microspotting. The prepared unimolecular oligonucleotides were microspotted on aldehyde-derivatized glass slides to make partial-dsDNA microarrays. Finally, the partial-dsDNA microarrays were converted into a unimolecular complete-dsDNA microarray by a DNA polymerase extension reaction. The efficiency and accuracy of the polymerase synthesis were demonstrated by the fluorescent-labeled dUTP incorporation in the enzymatic extension reaction and the restriction endonuclease digestion of the fabricated unimolecular complete-dsDNA microarray. The accessibility and specificity of the sequence-specific DNA-binding proteins binding to the immobilized unimolecular dsDNA probes were demonstrated by the binding of Cy3 labeled NF-?B (p50·p50) to the unimolecular dsDNA microarray. This unimolecular dsDNA microarray provides a general technique for high-throughput DNA-protein or DNA-drugs interactions.
DNp73 improves generation efficiency of human induced pluripotent stem cells
Yi Lin, Zuxin Cheng, Zhijian Yang, Jingui Zheng, Tongxiang Lin
BMC Cell Biology , 2012, DOI: 10.1186/1471-2121-13-9
Abstract: Transcription factors, Oct4, Sox2, Klf4 and cMyc (4TF, Yamanaka factors) are used as basal conditions to generate iPS cells. In addition, the factor of DNp73(actually alpha splicing DNp73, DNp73α) is used to generate iPS cells. The experiment found that the addition of DNp73 gene increases human iPS cell generation efficiency by 12.6 folds in comparison to human fibroblast cells transduced with only the basal conditions. Also, iPS cells generated with DNp73 expression are more resistant to in vitro and in vivo differentiation.This study found DNp73, a family member of p53, is also involved in the human iPS cell generation. Specifically, that the involvement of DNp73 generates iPS cells that are more resistant to in vitro and in vivo differentiation. Therefore, this data may prove to be useful in future developmental studies and cancer researches.Human induced pluripotent stem cells hold great promise in regenerative medicine, disease modeling, and drug discovery [1,2]. However, the iPS cell generation efficiency is extremely low at around 1 from 10,000 parental cells [1,2], limiting its' use. Also, such a low efficiency suggests that major factors in de-differentiation or reprogramming have not been identified yet. Recently, a series of breakthrough discoveries have brought to attention that, blocking the important tumor suppressor protein p53, and its downstream pathways, dramatically improves generation efficiency of induced pluripotent stem cells [3-7]. The data suggest that p53 is a key link between cellular reprogramming and tumor formation since it prevents differentiated cells from transforming into pluripotent stem cells.In 2005, we found that p53 induced differentiation of mouse embryonic stem (ES) cells by inhibiting a core transcription factor, Nanog, in the presence of stresses [8]. Nanog is a key ES cell transcription factor; Loss of Nanog expression led to rapid differentiation [9,10]. The p53 protein directly binds to the Nanog promoter to suppress it
Effect of sulfur on enhancing nitrogen-doping and magnetic properties of carbon nanotubes
Cui Tongxiang,Lv Ruitao,Huang Zheng-hong,Kang Feiyu
Nanoscale Research Letters , 2011,
Abstract: Sulfur (S) is introduced as an additive in the growth atmosphere of carbon nanotubes (CNTs) in the range of 940-1020°C. CNT products with distorted sidewalls can be obtained by S-assisted growth. Moreover, many fascinating CNT structures can also be found in samples grown with S addition, such as bamboo-like CNTs, twisted CNTs, arborization-like CNTs, and bead-like CNTs. Compared with CNTs grown without S, more nitrogen-doping content is achieved in CNTs with S addition, which is beneficial for the properties and applications of nitrogen-doped CNTs. In addition, S can also enhance the encapsulation of ferromagnetic materials and thus improve the soft magnetic properties of CNTs, which is favorable to the applications of CNTs in the electromagnetic wave-absorbing and magnetic data storage areas.
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