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Now showing items 49 - 64 of 358

  • All-nanoparticle concave diffraction grating fabricated by self-assembly onto magnetically-recorded templates

    Ye, L.   Terry, B.   Mefford, O. T.   Rinaldi, C.   Crawford, T. M.  

    Using the enormous magnetic field gradients present near the surface of magnetic recording media, we assemble diffraction gratings with lines consisting entirely of self-assembled magnetic nanoparticles that are transferred to flexible polymer thin films. These nanomanufactured gratings have line spacings programmed with commercial magnetic recording and are inherently concave with radii of curvature controlled by varying the polymer film thickness. This manufacturing approach offers a low-cost alternative for realizing concave gratings and more complex optical materials assembled with single-nanometer precision. (c) 2013 Optical Society of America
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  • Control/Maintenance Strategy for Fault Tolerant Mode and Reliability Analysis of Hydro Power Stations

    Ye, L.   Wang, S.   Malik, O. P.   Bing, F.   Zeng, Y.  

    Reliability analysis for hydro power stations for (N+M) and 2N fault tolerant modes (FTM) and their comparison from the standpoint of control and maintenance have been carried out in this paper. It shows that the (N+M) FTM is superior to 2N FTM in reliability and economics in most cases. So, (N+M) FTM is recommended for large power stations, especially for multiunit plants. A simple method for choosing the number of standby controllers is developed by optimizing the (N+M) FTM. The ideas and results proposed in this paper can be used not only for goveming systems in hydro power stations but also for other industrial systems.
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  • Impregnation and Consolidation in Composites Made of GF/PP Powder Impregnated Bundles

    Ye, L.   Klinkmuller, V.   Friedrich, K.  

    A polypropylene (PP) powder impregnated glass fiber (GF) bundle system was selected to investigate the relationships between impregnation mechanisms and pro cessing conditions during consolidation of these materials. Microscopy of cross-sections and density measurements helped to examine the quality of impregnation and consolida tion. Based on microscopic observations and previously developed processing theories, an impregnation model for the qualitative description of the consolidation behavior in lami nates made out of these materials is generated. It can be used to describe variations in void content over the laminate thickness as a function of bundle geometry and combinations of processing variables. The relationships between processing temperature, holding time and applied pressure required to reach full consolidation were evaluated. Results of transverse flexural tests are used to correlate the mechanical properties with the impregnation quality, in particular the void content in the laminates. Finally, the optimum processing window for manufacturing of laminates out of this material is suggested.
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  • On the origin of the concentration of interplanetary dust around the earth: Ye. L. Ruskol: (pp. 145–150).

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  • Electronic structure of kink and kink-antikink defects in polyacetylene

    Ye, L.   Freeman, A. J.   Ellis, D. E.   Delley, B.  

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  • Sound propagation in sodium di-2-ethyl-hexylsulfosuccinate micelles and microemulsions

    Ye, L.   Weitz, D. A.   Sheng, Ping   Huang, J. S.  

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  • Microstructure investigation of Sn‐0.5Cu‐3.5Ag and Sn‐3.5Ag‐0.5Cu‐0.5B lead‐free solders

    Ye, L.   Lai, Z.H.   Liu, J.   Th?lén, A.  

    This paper identifies the intermetallics formed in Sn-0.5Cu-3.5Ag and Sn3.5Ag-0.5Cu-0.5B (wt%) lead-free solders, and the influence of boron on these precipitates. SEM, TEM and SIMS were used to reveal the difference in microstructure in both solder alloys. It was found that the intermetallics formed were Ag 3Sn and Cu 6Sn 5. Both solders were found to have a dispersion structure of Ag 3Sn particles with network-shaped subgrains. The Ag 3Sn microstructure was also found to become finer and more uniform in Sn3.5Ag-0.5Cu-0.5B solder, due to the addition of boron, while there was little effect from the boron on the Cu 6 Sn 5 phase
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  • Blood Cell-Derived Induced Pluripotent Stem Cells Free of Reprogramming Factors Generated by Sendai Viral Vectors

    Ye, L.   Muench, M. O.   Fusaki, N.   Beyer, A. I.   Wang, J.   Qi, Z.   Yu, J.   Kan, Y. W.  

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  • Mesostructural aspects of interlaminar fracture in thermoplastic composites: Is crystallinity a key?

    Ye, L.   Beehag, A.   Friedrich, K.  

    Continuous fiber bundles, pre-impregnated with dry polymer fibers by a typical co-mingling technique, were used to prepare unidirectional composite plates. After finding the relevant conditions for full impregnation during thermal treatment, the conditions of the latter were varied so that various morphologies of the semicrystalline thermoplastic matrix could be established between the fibers. The resulting mesostructures in the final composite plates consisted of resin-rich and fiber-rich areas which had a different influence on the interlaminar fracture (ILF) behavior of the composites. For the same mesostructural appearance, the degree of crystallinity could be modified by a separate annealing procedure. It turned out that the local fracture mechanisms were influenced by the particular morphology in the resin-rich regions (fine spherulitic in comparison to coarse spherulitic, under additional influence of local voids). The ILF studies were carried out under mode I conditions, and it became obvious that the different morphologies affected the resulting interlaminar fracture energies (GIC) in different ways. In general, it can be stated that a coarse spherulitic morphology results in lower values of fracture energy, mainly due to interspherulitic fracture phenomena. The additional effects of crystallinity for the same spherulitic size were also analyzed.
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  • The limitation of effective moduli in analysis of fibrous composite materials: Ye, L. Composites Science and Technology Vol 44 No 2 (1992) pp 145–150

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  • Dynamic Rigidity Percolation in AOT Micelles and Microemulsions

    Ye, L.   Weitz, D. A.   Sheng, Ping   Huang, J. S.  

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  • Bone Morphogenetic Protein-9 Induces Apoptosis in Prostate Cancer Cells, the Role of Prostate Apoptosis Response-4

    Ye, L.   Kynaston, H.   Jiang, W. G.  

    Bone morphogenetic proteins (BMP) have been implicated in the development of bone metastases in prostate cancer. In this study, we investigated the role which BMP-9 played in prostate cancer and found that the expression of BMP-9 was decreased or absent in prostate cancer, particularly in the foci of higher grade disease. We further investigated the influence of BMP-9 on the biological behaviors of prostate cancer cells. The forced overexpression of BMP-9 prevented the in vitro growth, cell-matrix adhesion, invasion, and migration of prostate cancer cells. We also elucidated that BMP-9 induced apoptosis in PC-3 cells through the up-regulation of prostate apoptosis response-4. Among the receptors which have been implicated in the signaling of BMP-9, BMPR-IB and BMPR-II have also been implicated in the development and progression of prostate cancer. Knockdown of BMPR-IB or BMPR-II using respective hammerhead ribozyme transgenes could promote cell growth in vitro. We also found that BMPR-II is indispensable for the Smad-dependent signal transduction by BMP-9 in PC-3 cells, in which Smad-1 was phosphorylated and translocated from the cytoplasm into the nuclei. Taken together, BMP-9 inhibits the growth of prostate cancer cells due to the induced apoptosis, which is related to an up-regulation of prostate apoptosis response-4 through a Smad-dependent pathway. BMP-9 could also prevent the migration and invasiveness of prostate cancer. This suggests that BMP-9 may function as a tumor suppressor and apoptosis regulator in prostate cancer. (Mol Cancer Res 2008;6(10):1594-606)
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  • Barbus anatolicus, a new barbel from the K?z?l?rmak and Ye?il?rmak River drainages in northern Anatolia (Teleostei: Cyprinidae)

    TURAN DAVUT   KAYA CüNEYT   GEIGER MATTHIAS   FREYHOF J?RG  

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  • Preparation of Pt/Buckypaper by Surface Modified Multi-Walled Carbon Nanotubes for Oxygen Reduction Reaction in PEMFCs

    Ye, L.   Gao, Y.   Zheng, J.   Li, P.  

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  • A method in the study of band structure for GAC

    Ye, L.   Zhang, K.M.  

    A simple but self-consistent scheme is proposed for studying the electronic structure of graphite acceptor compounds (GAC). The basic concept of the computer renormalization group (CRG) is applied in simplifying the interactions between graphite and the intercalants, and a `pseudo-atom' is used to simulate the intercalant molecule. This model enables one to study different IC 8 type GAC in the same program, the extended Huckel energy band method is developed and the resulting band structures and Fermi surface properties of GAC(FeCl 3 , AsF 5) thus obtained are discussed and compared with the present data
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  • Dmp1-deficient Mice Display Severe Defects in Cartilage Formation Responsible for a Chondrodysplasia-like Phenotype

    Ye, L.   Mishina, Y.   Chen, D.   Huang, H.   Dallas, S. L.   Dallas, M. R.   Sivakumar, P.   Kunieda, T.   Tsutsui, T. W.   Boskey, A.   Bonewald, L. F.   Feng, J. Q.  

    Understanding the molecular mechanisms by which cartilage formation is regulated is essential toward understanding the physiology of both embryonic bone development and postnatal bone growth. Although much is known about growth factor signaling in cartilage formation, the regulatory role of noncollagenous matrix proteins in this process are still largely unknown. In the present studies, we present evidence for a critical role of DMP1 (dentin matrix protein 1) in postnatal chondrogenesis. The Dmp1 gene was originally identified from a rat incisor cDNA library and has been shown to play an important role in late stage dentinogenesis. Whereas no apparent abnormalities were observed in prenatal bone development, Dmp1-deficient (Dmp1(-I-)) mice unexpectedly develop a severe defect in cartilage formation during postnatal chondrogenesis. Vertebrae and long bones in Dmp1-deficient (Dmp1(-I-)) mice are shorter and wider with delayed and malformed secondary ossification centers and an irregular and highly expanded growth plate, results of both a highly expanded proliferation and a highly expanded hypertrophic zone creating a phenotype resembling dwarfism with chondrodysplasia. This phenotype appears to be due to increased cell proliferation in the proliferating zone and reduced apoptosis in the hypertrophic zone. In addition, blood vessel invasion is impaired in the epiphyses of Dmp1(-I-) mice. These findings show that DMP1 is essential for normal postnatal chondrogenesis and subsequent osteogenesis.
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