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Now showing items 1 - 16 of 1349

  • Smoothed Finite Element Method. Von Liu, G. R., Nguyen, T. T.

    No abstract is available for this article.
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  • Two-stage wrinkling of Al films deposited on polymer substrates

    Wu, K.   Yuan, H.Z.   Li, S.J.   Zhang, J.Y.   Liu, G.   Sun, J.  

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  • Strengthening of a CrMnFeCoNi high-entropy alloy by carbide precipitation

    Gao, N.   Lu, D.H.   Zhao, Y.Y.   Liu, X.W.   Liu, G.H.   Wu, Y.   Liu, G.   Fan, Z.T.   Lu, Z.P.   George, E.P.  

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  • Similarity of ionized gas nebulae around unobscured and obscured quasars

    Liu, G.   Zakamska, N. L.   Greene, J. E.  

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  • The potential application of urine derived stem cells in male infertility

    Liu, G.   Li, T.   Zhang, J.   Yang, X.   Liang, X.   Zhang, Y.  

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  • Four-site Case Study of Water Extraction from CO2 Storage Reservoirs

    Liu, G.   Gorecki, C.D.   Saini, D.   Bremer, J.M.   Klapperich, R.J.   Braunberger, J.R.  

    Water extraction is one possible means of enhancing storage capacity and managing carbon dioxide (CO2) storage reservoirs. This study investigates the efficacy of water extraction in CO2 storage applications through the use of dynamic simulations under various conditions on conceptual heterogeneous geological models based on four CO2 storage sites in different basins of the world. The simulations indicate that the CO2 storage capacities can be increased, and pressure and plume management can likely be accomplished through the use of water extraction. (C) 20xx Energy & Environmental Research Center, University of North Dakota. Published by Elsevier Open access under CC BY-NC-ND license.
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  • Design of a CW high charge state heavy ion RFQ for SSC-LINAC

    Liu, G.   Lu, Y.R.   He, Y.   Wang, Z.   Xiao, C.   Gao, S.L.   Yang, Y.Q.   Zhu, K.   Yan, X.Q.   Chen, J.E.   Yuan, Y.J.   Zhao, H.W.  

    The new linac injector SSC-LINAC has been proposed to replace the existing Separator Sector Cyclotron (SSC). This effort is to improve the beam efficiency of the Heavy Ion Research Facility of Lanzhou (HIRFL). As a key component of the linac, a continuous-wave (CW) mode high charge state heavy ion radio-frequency quadrupole (RFQ) accelerator has been designed. It accelerates ions with the ratio of mass to charge up to 7 from 3.728 keV/u to 143 keV/u. The requirements of CW mode operation and the transportation of intense beam have been considered as the greatest challenges. The design is based on U-238(34+) beams, whose current is 0.5 pmA (0.5 particle mili-ampere, which is the measured 17 emA electric current divided by charge state of heavy ions). It achieves the transmission efficiency of 94% with 2508.46 mm long vanes in simulation. To improve the transmission efficiency and quality of the beams, the phase advance has been taken into account to analyze the reasons of beam loss and emittance growth. Parametric resonance and beam mismatch have been carefully avoided by adjusting the structure parameters. The parameter-sensitivity of the design is checked by transportation simulations of various input beams. To verify the applicability of machining, the effects of different vane manufacturing methods on beam dynamics are presented in this paper. (C) 2012 Elsevier B.V. All rights reserved.
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  • PS182 Remote ECG Monitoring the Oculocardiac Reflex During Strabismus Surgery

    Liu, G.   Zhang, H.   Chen, X.  

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  • 4-HNE expression in diabetic rat kidneys and the protective effects of probucol

    Liu, G.   Ji, W.   Huang, J.   Liu, L.   Wang, Y.  

    To investigate 4-HNE expression in diabetic rat kidneys and the protective effect of probucol. Diabetic rat models were established. Diabetic rats with successful modeling were randomly divided into the diabetic group (group D) and probucol treated group (group P). Normal rats were put into the control group (group C). Rats in group P were treated with probucol (110 mg/kg day), and rats in groups D and C were given equal volume of water instead. Serum creatinine (SCr), urea nitrogen (BUN), triglyceride (TG), total cholesterol (TC), and 24-h urinary protein were measured at the 4th, 8th, and 12th weeks. Periodic acid-schiff (PAS) staining and hematoxylin-eosin (HE) staining were used to evaluate the renal pathological changes. The immunohistochemistry and Western-blot were used to detect 4-HNE expression in renal tissue. The SCr, BUN, TG, TC, and 24-h urinary protein in group D increased in the 4th, 8th, and 12th weeks and were higher than those in group C (P < 0.05). The SCr, BUN, TG, TC, and 24-h urinary protein in group P decreased compared to group D (P < 0.05). Pathological kidney changes in group D were more serious than those in group P. The level of 4-HNE expression in group D significantly increased at the 4th, 8th, and 12th weeks and were higher than those in group C (P < 0.05). In the kidneys treated with probucol, the level of 4-HNE significantly decreased compared to group D (P < 0.05). Probucol can protect the diabetic kidney by decreasing 4-HNE expression and lipid peroxidation levels.
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  • Kinase AKT1 Negatively Controls Neutrophil Recruitment and Function in Mice

    Liu, G.   Bi, Y.   Wang, R.   Shen, B.   Zhang, Y.   Yang, H.   Wang, X.   Liu, H.   Lu, Y.   Han, F.  

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  • PIN11 Economic Burden of Invasive Pneumococcal Diseases in Urban China

    Liu, G.   Zhu, L.   Li, D.   Chen, D.E.   Deng, J.   Dong, P.   Shi, Q.  

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  • Case studies on virtual extrusion of aluminium alloys in real size

    Liu, G.   Zhou, J.   Duszczyk, J.   Fang, G.  

    Two case studies were conducted to illustrate the capabilities of the state-of-the-art computer simulation technology applied to the aluminium extrusion process and demonstrate the usefulness of virtual extrusion in real size to the die designer and extrusion process engineer alike. A deform 3D software package was used for virtual extrusion in real size to manufacture a hollow profile through a porthole die (case I) and two precision solid profiles through a two-hole multi-step pocket die (case II). Temperature, stress and velocity distributions were revealed. In case I, the filling of the ports, welding in the welding chamber and forming of the hollow profile were visualised. The quality of the longitudinal welds along the hollow profile length was assessed. In case II, the deflection of two solid profiles from the centreline to different extents was predicted, thereby providing the guidelines for die design modification. The modified die indeed performed better.
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  • Nin one binding protein expression as a prognostic marker in prostate carcinoma

    Liu, G.   Shen, D.   Jiao, L.   Sun, Y.  

    To investigate the prognostic value of expression levels of nin one binding protein (Nob1) in prostate carcinoma. Nob1 protein levels were evaluated by Western blot in samples from 40 prostate carcinomas and matched adjacent non-neoplastic prostate tissues. Nob1 expression was also assessed by immunohistochemistry in samples from 300 prostate carcinoma and matched adjacent non-neoplastic prostate tissues, as well as 20 benign prostatic hyperplasia samples. The findings were compared with clinical and pathologic parameters and patient outcome. Nob1 protein analysis showed significant differences between the prostate carcinomas and control groups tested. Immunohistochemical analysis showed that Nob1 positivity was higher in prostate carcinoma than that in paired adjacent non-cancerous tissues (58 vs 7 %, P < 0.001). Nob1 positivity was significantly associated with high Gleason scores and metastasis in patients. Nob1 expression was significantly associated with shorter biochemical recurrence-free survival (BCRFS). Multivariate analysis revealed that Nob1 is an independent marker for BCRFS. These findings provide evidence that Nob1 is an indicator of poor prognosis in prostate carcinoma.
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  • Fracture localisation in retreating side of friction stir welded magnesium alloy

    Liu, G.   Xin, R.   Li, J.   Liu, D.   Liu, Q.  

    Friction stir welding was successfully applied to joint Mg–3Al–1Zn alloy sheets. Serious strain localisation was observed during transverse tensile tests of the welds. Fracture was initiated from the interface of thermal–mechanical affected zone and stir zone in retreating side. The reasons for such localised fracture behaviour were explained by analysing the texture, Schmid factor, grain size and strain localisation characteristics in retreating side and advancing side. The results suggest that the coarser grain size and higher Schmid factor resulted in the easier activation of basal slip in retreating side than advancing side, which caused more serious strain localisation and stress concentration, and hence promoted fracture initiation from the interface of thermal–mechanical affected zone and stir zone in retreating side.
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  • A Necessary and Sufficient Condition for the Liveness of Normal Nets

    Liu, G.   Jiang, C.   Chao, D. Y.  

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  • A global tropospheric ozone climatology from trajectory-mapped ozone soundings

    Liu, G.   Liu, J.   Tarasick, D. W.   Fioletov, V. E.   Jin, J. J.   Moeini, O.   Liu, X.   Sioris, C. E.   Osman, M.  

    A global three-dimensional (i.e. latitude, longitude, altitude) climatology of tropospheric ozone is derived from the ozone sounding record by trajectory mapping. Approximately 52 000 ozonesonde profiles from more than 100 stations worldwide since 1965 are used. The small number of stations results in a sparse geographical distribution. Here, forward and backward trajectory calculations are performed for each sounding to map ozone measurements to a number of other locations, and so to fill in the spatial domain. This is possible because the lifetime of ozone in the troposphere is of the order of weeks. This physically based interpolation method offers obvious advantages over typical statistical interpolation methods. The trajectory-mapped ozone values show reasonable agreement, where they overlap, to the actual soundings, and the patterns produced separately by forward and backward trajectory calculations are similar. Major regional features of the tropospheric ozone distribution are clearly evident in the global maps. An interpolation algorithm based on spherical functions is further used for smoothing and to fill in remaining data gaps. The resulting three-dimensional global tropospheric ozone climatology facilitates visualization and comparison of different years, decades, and seasons, and offers some intriguing insights into the global variation of tropospheric ozone. It will be useful for climate and air quality model initialization and validation, and as an a priori climatology for satellite data retrievals. Further division of the climatology into decadal and annual averages can provide a global view of tropospheric ozone changes, although uncertainties with regard to the performance of older sonde types, as well as more recent variations in operating procedures, need to be taken into account.
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