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The effects and anti-proliferation mechanisms of asoprisnil on rat uterine fibroids

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The effects and anti-proliferation mechanisms of asoprisnil ...

MAKING DUCTILE CAST IRON WITh ESR PROCESS

中华医学会第八次全国计划生育学术会议

作者： X.L.Shen X.L.Wu h.lou P.Su Family Planning Research Institute of huazhong University of Science and Technology

Background Asoprisnil,a novel selective progesterone receptor modulator(SPRM)with partial agonist and antagonist activities,is being studied for the control of symptomatic uterine *** exact mechanism of action is not ...

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Acta Metallurgica Sinica(English Letters) 1998年第3期11卷 169-174页

作者： S.J.Chu h.h.lou Q.Niu Univ of Science and Technology Beijing Beijing China

Making ductile cast iron with ESR process under D.C. condition without adding spheroidizing inoculant alloys has been studied in laboratory. The key operation of ESR for cast iron is increasing the silicon content in unrefined consumable electrodes of flake graphite cast iron and using CaF2-based slags containing rare-earth or basic oxides and magnesium fluoride. The samples excel ductile cast iron produced by general technological process in fatigue strength and sealing performance.

关键词： ductile cast iron electroslag remelting nodulizing element

Averages of shifted convolution sums for arithmetic functions

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Frontiers of Mathematics in China 2019年第1期14卷 123-134页

作者： Miao lou School of Mathematics Shandong University Jinan 250100 China

Let f be a full-level cusp form for GLm(Z) with Fourier coefficients Af(cm-2,…, c1, n): Let λ(n) be either the von Mangoldt function Λ(n) or the k-th divisor function τk(n): We consider averages of shifted convolution sums of the type Σ|h|≤h |ΣXh)λ(n)|^2. We succeed in obtaining a saving of an arbitrary power of the logarithm, provided that X^8/33+ε≤h≤X^1-ε.

关键词： Average shifted convolution sum arithmetic function

healing Process of Casting Pores in a Ni-based Superalloy by hot Isostatic Pressing

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维普期刊数据库

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Journal of Materials Science & Technology 2015年第11期31卷 1151-1157页

作者： X.G.Zheng Y.-N.Shi L.h.lou Shenyang National Laboratory for Materials Science Institute of Metal Research Chinese Academy of Sciences Superalloy Division Institute of Metal Research Chinese Academy of Sciences

hot isostatic pressing （hIP） with a pressure of 180 MPa at a temperature of 1170 ℃ was introduced to an investment cast Ni-based superalloy （Mgl） turbocharger blade to explore the healing process of casting pores generated during investment casting. Optical micrograph and scanning electron naicroscopy （SEM） observations indicate that eutectic pores are the main cast defects in the as-cast blade before hIP. These pores normally locate at the solidification front of γ/γ＇ eutectic with a size of a few micrometers to a few tens of micrometers. After hIP for 4 h, most of the pores were closed. Based on phase characteristics, these pores were healed by the formation of γ matrix with finer and irregular-shaped γ＇ precipitates. healing interface can be easily distinguished by SEM. Line scan by using energy dispersive X-ray spectroscopy （EDS） reveals a much higher Ti and Al concentration in the healing interface. It is proposed that solute diffusion toward the casting pores during hIP results in the formation of γ, and the much higher concentration of γ＇-forming elements Al and Ti near the healing interface contributes to the precipitation of γ＇ in the healed region in the succeeding cooling process after hIP.

关键词： Superalloy hot isostatic pressing (hIP) healing

Effect of Mo Addition on Microstructural Characteristics in a Re-containing Single Crystal Superalloy

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Journal of Materials Science & Technology 2015年第2期31卷 143-147页

作者： X.G.Liu L.Wang L.h.lou J.Zhang Superalloys Division Institute of Metal ResearchChinese Academy of Sciences Shenyang National Laboratory for Materials Science Institute of Metal ResearchChinese Academy of Sciences

The effect of Mo addition on microstructural characteristics of a nickel-base single crystal superalloy containing 4 wt% Re was investigated. The γ/γ’ partitioning ratios determined by energy dispersive spectrometer attached to a transmission electron microscope showed that the addition of Mo enhanced the partitioning of Re,W and Cr in the g matrix while decreased the concentration of Ta in the matrix. Synchrotron radiation diffraction was adopted to measure the γ/γ’ lattice misfit at room temperature. The results indicated that Mo addition changed the γ/γ’ lattice misfit towards larger negative as well as increased the tetragonal distortion of the γ lattice. Additionally,Mo addition led to microstructural instability and altered the precipitation behavior of topologically close-packed phases during 1100 C exposure. Instead of precipitating directly from the matrix,the μ phase was observed to be converted from the α phase which precipitated preferentially as a metastable intermediate in the alloy with high Mo content.

关键词： Superalloy Molybdenum Microstructure Partitioning

Doubly periodic patterns of modulated hydrodynamic waves:exact solutions of the Davey-Stewartson system

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Acta Mechanica Sinica 2011年第5期27卷 620-626页

作者： J.-h. Li S.-Y. lou K.-W. Chow Department of Mechanical Engineering University of Hong Kong Pokfulam Road Hong Kong China Department of Physics Shanghai Jiao Tong University200030 Shanghai China

Exact doubly periodic standing wave patterns of the Davey-Stewartson （DS） equations are derived in terms of rational expressions of elliptic *** fluid mechanics,DS equations govern the evolution of weakly nonlinear,free surface wave packets when long wavelength modulations in two mutually perpendicular,horizontal directions are *** functions with two different moduli （periods） are necessary in the two *** relation between the moduli and the wave numbers constitutes the dispersion relation of such *** the long wave limit,localized pulses are recovered.

关键词： Free surface waves · Periodic patterns · DaveyStewartson equations

Co-Poisson structures on polynomial hopf algebras

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Science China Mathematics 2018年第5期61卷 813-830页

作者： Qi lou Quanshui Wu School of Mathematical Sciences Fudan University

The hopf dual h~? of any Poisson hopf algebra h is proved to be a co-Poisson hopf algebra provided h is noetherian. Without noetherian assumption, unlike it is claimed in literature, the statement does not hold. It is proved that there is no nontrivial Poisson hopf structure on the universal enveloping algebra of a non-abelian Lie algebra. So the polynomial hopf algebra, viewed as the universal enveloping algebra of a finite-dimensional abelian Lie algebra, is considered. The Poisson hopf structures on polynomial hopf algebras are exactly linear Poisson structures. The co-Poisson structures on polynomial hopf algebras are *** correspondences between co-Poisson and Poisson structures are also established.

关键词： Poisson algebra co-Poisson coalgebra Poisson hopf algebra co-Poisson hopf algebra

ELECTROChEMICAL IMPEDANCE SPECTROSCOPY STUDY OF CORROSION INhIBITION OF MODIFIED LIGNOSULPhONATE FOR CARBON STEEL

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Acta Metallurgica Sinica(English Letters) 2005年第4期18卷 519-524页

作者： C.h. Yi X. Q. Qiu D.J. Yang h.M. lou College of Chemical and Energy Engineering South China University of TechnologyGuangzhou 510640 China

The corrosion inhibition for carbon steel in circulating cooling water by modified lignosulphonate has been investigated using electrochemical impedance spectroscopy technique. Results show that the inhibition efficiency of modified lignosulphonate GCL2 is a great improvement on that of lignosulphonate. The maximum inhibition efficiency of GCL2 reaches 99.21% at the concentration of 400mg·L^-1 at 303K. The corrosion inhibition of GCL2 is attributed to forming adsorption film on the metal surface for the electrochemical impedance spectroscopy in GCL2 solution shows more than one ***,results also indicate that it is more efficient in stirring solution than in still solution for GCL2 because the constant of adsorption in stirring solution is much larger than that in still solution. The adsorption of inhibitor GCL2 follows Langmuir＇s adsorption isotherm.

关键词： electrochemical impedance spectroscopy EIS corrosion inhibition modified lignosulphonate

Effect of Solidification Condition and Carbon Content on the Morphology of MC Carbide in Directionally Solidified Nickel-base Superalloys

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Journal of Materials Science & Technology 2014年第12期30卷 1296-1300页

作者： X.W.Li L.Wang J.S.Dong L.h.lou Superalloys Division Institute of Metal Research Chinese Academy of Sciences

Evolution of the morphology of MC carbides with the change of cooling rate and carbon content in two kinds of nickel-base superalloys, K417 G and DD33, has been investigated. The morphology of MC carbides evolves from faceted to script-like with increasing cooling rate. Varying the carbon content from 40X10-6 to 320X10-6, the morphology of carbides changes from blocky, rod-like into script-like. Scanning electron microscopy observation of deep-etched samples indicates that these carbides evolve from octahedral to dendritic and then into welldeveloped dendrites accordingly in a three-dimensional manner. The morphology evolution is discussed from the viewpoint of the preferential growth orientation of fcc crystals and the carbide growth rate during directional solidification.

关键词： Carbides morphology Directional solidification Three-dimensional microstructure Nickel-base superalloys