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Fuzzy Shape Control Based on El man Dynamic Recursion Network Prediction Model

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Journal of Iron and Steel Research International 2006年第1期13卷 31-35页

作者： JIA Chun-yu liu hong-min College of Mechanical Engineering Yanshan University Qinhuangdao 066004 Hebei China

In the strip rolling process, shape control system possesses the characteristics of nonlinearity, strong coupling, time delay and time variation. Based on self adapting Elman dynamic recursion network prediction model, the fuzzy control method was used to control the shape on four-high cold mill. The simulation results showed that the system can be applied to real time on line control of the shape.

关键词： shape prediction shape control Elman dynamic recursion network parameter self-adjusting fuzzy control

Role of processing parameters on relative density,microstructure and mechanical properties of selective laser melted titanium alloy

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China Foundry 2024年第6期21卷 676-684页

作者： Tian-yu liu Bo-liang liu Jiao-jiao Cheng Shi-bing liu Kun Shi hong-yu liu Jun Zhao National Key Laboratory of Advanced Casting Technologies Shenyang Research Institute of Foundry Co.Ltd.CAMShenyang 110022China

The relationships between the selective laser melting(SLM)processing parameters including laser power,scanning speed and hatch space,the relative density,the microstructure,and resulting mechanical properties of Ti-6Al-2Zr-1Mo-1V alloy were investigated in this *** result shows that laser power acts a dominant role in determining the relative density in comparison with scanning speed and hatch *** optimal SLM process window for fabricating relative density>99%samples is located in the energy density range of 34.72 J·mm^(-3)to 52.08 J·mm^(-3),where the laser power range is between 125 W and 175 *** upward trend is found in the micro-hardness as the energy density is *** optimum SLM processing parameters of Ti-6Al-2Zr-1Mo-1V alloy are:laser power of 150 W,scanning speed of 1,600 mm·s^(-1),hatch space of 0.08 mm,and layer thickness of 0.03 *** highest ultimate tensile strength,yield strength,and ductility under the optimum processing parameter are achieved,which are 1,205 MPa,1,099 MPa,and 8%,*** results of this study can be used to guide SLM production Ti-6Al-2Zr-1Mo-1V alloy parts.

关键词： selective laser melting processing parameter Ti-6Al-2Zr-1Mo-1V titanium alloy relative density microstructure mechanical properties

Effect of V and N on Microstructures and Properties of Grade-70 Tire Cord Steel during Cold Drawing

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Journal of Iron and Steel Research International 2015年第2期22卷 171-178页

作者： hong-yu liu Bao-yi WAN Xiao-yu ZENG Chong LIN hong-jun WANG College of Science Wuhan University of Science and Technology Hubei Province Key Laboratory of Systems Science in Metallurgical Process Department of Physics and Astronomy Clemson University

Commercial grade-70 tire cord steel was microalloyed with V and N to explore the possibility of substitu- ting V for C and the effect of V and N on cementite dissolution during cold drawing process. Tensile strength, elon- gation and torsion laps of cold-drawn wires were determined. Microstructures of secondary phases were studied by transmission electron microscopy （TEM） and energy dispersive spectroscopy （EDS）. Saturation magnetization was measured by using a vibrating sample magnetometer （VSM） to evaluate cementite dissolution during cold drawing process. Experimental results showed that with the increase of V content, tensile strength increased, elongation slightly decreased, and the torsion laps of the cold-drawn wires decreased. Results also showed that with the increase of N content, a peak （increasing first and then decreasing） appeared in the tensile strength graph, and an increase of elongation and a decrease of torsion laps of the cold-drawn wires occured. N is soluble in ferrite when its content is low. The increase in the content of N to 82 × 10^-6 will result in the precipitation of the V-containing secondary pha- ses. Also, cementite tended to be stable during cold drawing process with the increase of V and N contents. Grade-80 tire cord steel can be replaced by grade 70 tire cord steel microalloyed with 0. 086 mass% V.

关键词： tire cord steel cold-drawn wire cementite dissolution vanadium nitrogen

3D MXene architectures as sulfur hosts for high-performance lithium-sulfur batteries

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Journal of Energy Chemistry 2022年第3期31卷 429-439,I0012页

作者： yu-hong liu Cao-yu Wang Si-Lin Yang Fei-Fei Cao Huan Ye College of Science Huazhong Agricultural UniversityWuhan 430070HubeiChina

Lithium-sulfur batteries(LSBs)are one of the most promising energy storage devices because of their high theoretical energy density;however,inherent issues including poor electrical conductivity and severe dissolution of S and its discharged products hinder their practical *** have metallic conductivity,ultra-thin two-dimensional(2D)structures,rich surface functional groups,and macrostructural adjustability and have been widely used to design advanced sulfur hosts.3D network structures assembled by 2D MXene nanosheets have shown superior performance for improving reaction kinetics,accommodating and dispersing sulfur at the micro-/nanoscale,and capturing polysulfides due to their porous interconnected ***,the applications of MXene architectures related to 2D layered structures,3D multilayered structures,and 3D spherical structures as sulfur hosts are *** structure-performance relationship,challenges for current designs,and opportunities for future 3D architectures for LSBs are also analyzed.

关键词： Lithium-sulfur batteries Cathodes Sulfur hosts MXenes 3D architectures

Effect of hot isostatic pressing processing parameters on microstructure and properties of Ti60 high temperature titanium alloy

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China Foundry 2023年第1期20卷 49-56页

作者： Tian-yu liu Kun Shi Jun Zhao Shi-bing liu You-wei Zhang hong-yu liu Tian-yi liu Xiao-ming Chen Xin-min Mei Shenyang Research Institute of Foundry Co. Ltd.Shenyang 110022China State Key Laboratory of Light Alloy Casting Technology for High-end Equipment Shenyang 110022China

Hot isostatic pressing parameters are critical to Ti60 high temperature titanium alloy castings which have wide application perspective in *** order to obtain optimal processing parameters,the effects of hot isostatic pressing parameters on defects,composition uniformity,microstructure and mechanical properties of Ti60 cast high temperature titanium alloy were investigated in *** show that increasing temperature and pressure of hot isostatic pressing can reduce defects,especially,the internal defects are substantially eliminated when the temperature exceeds 920℃or the pressure exceeds 125 *** higher temperature and pressure can improve the microstructure ***,the higher pressure can promote the composition *** the temperature increases from 880℃to 960℃,α-laths are *** with increasing pressure,the grain size of prior-βphase,the widths ofα-laths andα-colony are *** tensile strength of Ti60 alloy is 949 MPa,yield strength is 827 MPa,and the elongation is 11%when the hot isostatic pressing parameters are 960℃/125 MPa/2 h,which exhibits the best match between the strength and plasticity.

关键词： hot isostatic pressing processing parameters Ti60 titanium alloy defects composition uniformity microstructure mechanical properties

A Property of Continuous Mapping from a Sphere to the Euclidean Space and Its Applications

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Journal of Mathematical Research and Exposition 2010年第2期30卷 319-322页

作者： yu hong liu College of Science Guangdong Ocean University Guangdong 524088 P. R. China

In this paper, we study the property of continuous mappings from a sphere to the Euclidean space. By using the theory of the periodic transformation in algebraic topology, we obtain a generalized Borsuk-Ulam theorem a... 详细信息

关键词： Smith special index fixed point free periodic transformation equivariant mapping.

Composition formula of Al-TMs high-entropy alloys derived by cluster-plus-glue-atoms model and its experimental verification

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China Foundry 2022年第6期19卷 544-550页

作者： Tian-yu liu Kun Shi Jun Zhao Shi-bing liu hong-yu liu Bo-liang liu Xin-min Mei Zhao-sheng Ning Xiao-ming Chen State Key Laboratory of Light Alloy Casting Technology for High-end Equipment Shenyang Research Institute of Foundry Co.Ltd.Shenyang 110022China

High-entropy alloys(HEAs)are based on solid solutions which characterized by chemical short-range ordering(CSRO),but there is no accurate structural tool to address CSRO characteristic,which obstacles precise composition design for *** this study,based on the cluster-plus-glue-atoms model,the composition law of Al-TMs(TMs,transition metals)HEAs with BCC and FCC structures was *** BCC structure,with five elements in equi-atomic ratio,the composition formula of Al-TMs HEAs can be expressed by a cluster formula[Al-M_(14)]Al_(3),and in non equi-atomic ratio can be expressed by[Al-M_(14)]Al,where M is the average atom of the *** in FCC structure,both Al-TMs HEAs with five elements in equiatomic and non equi-atomic ratios can be expressed by a cluster formula[Al-M_(12)]*** confirm the effectiveness of cluster formula for Al-TMs,two alloys were designed,[Al-Ti_(4)V_(3)Nb_(4)Mo_(3)]Mo and[Al-Ti_(3)V_(3)Nb_(4)Mo_(4)]*** show that the[Al-Ti_(3)V_(3)Nb_(4)Mo_(4)]Al alloy has both higher strength and higher plastic deformation at room ***,[Al-Ti_(3)V_(3)Nb_(4)Mo_(4)]Al alloy shows slower soften effect at 800℃,contributed to its higher *** substituting Ta for some of Mo,the strength of[Al-Ti_(3)V_(3)Nb_(4)Mo_(3)Ta]Al at room temperature and high temperature drastically decreases,suggesting that Ta element deteriorates the properties of Al-TMs alloys.

关键词： Al-TMs high-entropy alloys composition design short-range order cluster-plus-glue-atom model

Microstructure and mechanical properties of laser additive manufactured novel titanium alloy after heat treatment

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China Foundry 2021年第6期18卷 574-580页

作者： Tian-yu liu hong-yu liu Qian Yao Shi-bing liu Kun Shi Zhi-yong Zhang Chong-yang Li Shenyang Research Institute of Foundry Co. Ltd.Shenyang 110022China State Key Laboratory of Light Alloy Casting Technology for High-end Equipment Shenyang 110022China

A novel α+β titanium alloy with multi-alloying addition was designed based on the cluster formula 12[Al-Ti_(12)](AlTi_(2))+5[Al-Ti_(14)](AlV_(1.2)Mo_(0.6)Nb_(0.2))which was derived from *** nominal composition of this novel alloy was determined as *** this study,the novel alloy and Ti-6Al-4V alloy samples were prepared by laser additive *** microstructure,micro-hardness,room/high temperature tensile properties of the as-deposited samples were *** to Ti-6Al-4V,the novel alloy has much higher room and high temperature(600℃)tensile strengths,which are 1,427.5 MPa and 642.2 MPa,respectively;however,it has a much lower elongation(3.2%)at room temperature because of the finer *** improve the elongation of the novel alloy,heat treatment was *** solution at 960℃ or 970℃ for 1 h followed by air cooling and aging at 550℃ for 4 h followed by air cooling,a unique bi-modal microstructure which contains crab-like primaryαand residual β phase is obtained,improving the compression elongation by 80.9% compared to the as-deposited *** novel alloy can be used as a high-temperature and high-strength candidate for laser additive manufacturing.

关键词： laser additive manufacturing titanium alloy composition design heat treatment

Special AT-rich sequence-binding protein 2 acts as a negative regulator of stemness in colorectal cancer cells

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World Journal of Gastroenterology 2016年第38期22卷 8528-8539页

作者： Ying Li yu-hong liu yu-Ying Hu Lin Chen Jian-Ming Li Department of Pathology Nanfang HospitalSouthern Medical University Department of Pathology Baoan HospitalSouthern Medical University Department of Pathology Soochow University Medical School

AIM To find the mechanisms by which special AT-rich sequence-binding protein 2(SATB2) influences colorectal cancer(CRC) *** Cell growth assay, colony-forming assay, cell adhesion assay and cell migration assay were used to evaluate the biological characteristics of CRC cells with gain or loss of SATB2. Sphere formation assay was used to detect the self-renewal ability of CRC cells. The m RNA expression of stem cell markers in CRC cells with upregulated or downregulated SATB2 expression was detected by quantitative real-time polymerase chain reaction. Chromatin immunoprecipitation(Ch IP) was used to verify the binding loci of SATB2 on genomic sequences of stem cell markers. The Cancer Genome Atlas(TCGA) database and our clinical samples wereanalyzed to find the correlation between SATB2 and some key stem cell *** Downregulation of SATB2 led to an aggressive phenotype in SW480 and DLD-1 cells, which was characterized by increased migration and invasion abilities. Overexpression of SATB2 suppressed the migration and invasion abilities in SW480 and SW620 cells. Using sequential sphere formation assay to detect the selfrenewal abilities of CRC cells, we found more secondary sphere formation but not primary sphere formation in SW480 and DLD-1 cells after SATB2 expression was knocked down. Moreover, most markers for stem cells such as CD133, CD44, AXIN2, MEIS2 and NANOG were increased in cells with SATB2 knockdown and decreased in cells with SATB2 overexpression. Ch IP assay showed that SATB2 bound to regulatory elements of CD133, CD44, MEIS2 and AXIN2 genes. Using TCGA database and our clinical samples, we found that SATB2 was correlated with some key stem cell markers including CD44 and CD24 in clinical tissues of CRC *** SATB2 can directly bind to the regulatory elements in the genetic loci of several stem cell markers and consequently inhibit the progression of CRC by negatively regulating stemness of CRC cells.

关键词： Special AT-rich sequence-binding protein 2 Colorectal cancer Stemness Metastasis