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Growth of solidified shell in bloom continuous casting mold of hypo-peritectic steel based on a FeS tracer method

Journal of Iron and Steel Research International 2020年第7期27卷 782-787页

作者： da-peng li Hua-zhang Wu Hai-feng Wang Hong li State Key Laboratory of Advanced Steel Processing and Products Central Iron and Steel Research InstituteBeijing 100081China Benxi Iron&Steel Group Co. Ltd.Benxi 117021LiaoningChina State Key Laboratory of Advanced Metallurgy University of Science and Technology BeijingBeijing 100083China School of Metallurgical and Ecological Engineering University of Science and Technology BeijingBeijing 100083China

Solidification behavior in the mold region plays an important role in production efficiency and steel *** investigate shell growth within a mold,the sulfur prints of the entire shell thickness profile the meniscus to 100 mm below the mold were obtainedadding FeS tracer into molten steel during bloom continuous casting of hypo-peritectic *** law of shell thickness evolution along mold height and circumference was *** results show that there are three weak regions of solidification,which are in the mold upper part,in the mold lower part,and just below mold exit,possibly resulting periodic fluctuation of air gap between the shell and the mold,the impingement of melt jets on the solidification front,and the decreasing cooling intensity,*** solidification point along casting direction appears at approximately 35 mm below the ***,the solidified shell thickness in the inner side of the mold is a little larger than that in the outer side,and the former and the latter reach 25.5 and 24.3 mm at the mold exit,*** non-uniform shell growth in the inner side of the bloom is provided,while shell thicknesses in the narrow face and the outer side follow relatively regular *** of the mold,the thinnest shells on the transverse section exist in the regions of 60–90 mm and 40–70 mm the corners of the inner and outer sides,respectively,i.e.,the of-corners.

关键词： Continuous casting Mold Hypo-peritectic steel Solidified shell Sulfur print

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A Multi-step Thermodynamic Model for Alumina Formation during Aluminum Deoxidation in Fe–O–Al Melt

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Acta Metallurgica Sinica(English Letters) 2015年第2期28卷 272-280页

作者： Guo-Cheng Wang Qi Wang Sheng-li li Xin-Gang Ai da-peng li Key Laboratory of Chemical Metallurgy Engineering Liaoning Province University of Science and Technology Liaoning Jiangxi University of Science and Technology Benxi Steel Group Corporation

Based on the two-step nucleation mechanism, a multi-step thermodynamic model for alumina inclusion for- mation during aluminum deoxidation process was proposed in Fe-O-Al melt. Thermodynamic properties of metastable intermediates including （Al2O3）n clusters for prenucleation and α-Al2O3 nanoparticle for growth process were calculated using density functional theory. Furthermore, Gibbs free energy change of forming the intermediate by reaction between the dissolved aluminum （Al） and oxygen （O） in the melt was calculated. The results indicated that the thermodynamics of （Al2O3）n at steelmaking temperature are dependent on their structures, while that of α-Al2O3 nanoparticle are dependent on their size. The nuclei of α-Al2O3 which was originated from （Al2O3）n aggregated under a high supersaturation ratio of Al and O（Rs） in the melt. There existing excess oxygen because of the low Rs, but the secondary inclusions will be formed during the cooling process due to the excess oxygen. The nuclei lager than 20 nm can grow up spontaneously and instantaneously into primary inclusions because of thermodynamic drive. It is difficult to control the size of α-Al2O3 to be less than 20 nm, in the aluminum deoxidation process of the current conditions of steelmaking.

关键词： Multi-step thermodynamics Fe-O-AI melt Aluminum deoxidation DFT Nano-α-Al2O3

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Passivity breakdown of 13Cr stainless steel under high chloride and CO_2 environment

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International Journal of Minerals,Metallurgy and Materials 2019年第3期26卷 329-336页

作者： Hui-xin li da-peng li Lei Zhang Ya-wen Wang Xiu-yun Wang Min-xu Lu Institute for Advanced Materials and Technology University of Science and Technology Beijing Safetech Research Institute (Beijing) Co. Ltd. CRRC Beijing Locomotive Co. Ltd.

Herein, the effect of high chloride ion(Cl^-) concentration on the corrosion behavior and passive film breakdown of 13Cr martensitic stainless steel under CO_2 environment was demonstrated. The Cl^- concentration was varied from 30 to 150 g/L and cyclic potentiodynamic polarization was conducted to investigate the influence of the Cl^- concentration on the corrosion potential(E_(corr)), passive breakdown potential(E_(pit)), and repassivation potential(E_(rep)). The results of the polarization curves revealed that 13Cr stainless steel is susceptible to pitting under high Cl^- concentration. The passive breakdown potential and repassivation potential decreased with the increase of Cl-concentration. The semiconducting behavior of the passive film was investigated by Mott-Schottky analysis and the point defect model(PDM). It was observed that the iron cation vacancies and oxygen vacancies were continuously generated by autocatalytic reactions and the higher Cl^- concentration resulted in higher vacancies in the passive film. Once the excess vacancies condensed at the metal/film interface, the passive film became locally detached from the metal, which led to the breakdown of the passive film.

关键词： 13Cr stainless steel electrochemical characterization pitting corrosion high chloride concentration passive film breakdown

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Tumor suppress genes screening analysis on 4q in sporadic colorectal carcinoma

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World Journal of Gastroenterology 2008年第36期14卷 5606-5611页

作者： li-Xin Jiang Jie Xu Zhao-Wen Wang da-peng li Zhi-Hai peng Jian-Jun Gao lin He Hai-Tao Zheng Department of AbdomenSurgery Department the Affiliated Yantai YuhuangdingHospital of Qingdao University Medical College Yantai264000 Shandong Province China Department ofGeneral Surgery the Affiliated Shanghai First People Hospitalof Shanghai Jiaotong University Shanghai 200080 China Shanghai Bio-x Center ShanghaiJiaotong University Shanghai 200031 China

AIM: To search candidate tumor suppressor genes (TSGs) on chromosome 4q through detecting high loss of heterozygosity (LOH) regions in sporadic colorectal carcinoma in Chinese patients. METHODS: Thirteen fluorescent labeled polymorphic microsatellite markers were analyzed in 83 cases of colorectal carcinoma and matched normal tissue DNA by polymerase chain reaction (PCR). PCR products were eletrophoresed on an ABI 377 DNA sequencer. Genescan 3.7 and Genotype 3.7 software were used for LOH scanning and analysis. Comparison between LOH frequency and clinicopathological factors were performed by χ2 test. RESULTS: data were collected on all informative loci. The average LOH frequency on 4q was 28.56%. The D4S2915 locus showed highest LOH frequency (36.17%). Two obvious deletion regions were detected: one between D4S3000 and D4S2915 locus (4q12-21.1), another flanked by D4S407 and D4S2939 locus (4q25-31.1). None case showed complete deletion of 4q, most cases displayed interstitial deletion pattern solely. Furthermore, compared with clinicopathological features, a significant relationship was observed between LOH frequencies on D4S3018locus. In tumors larger than 5 cm in diameter, LOH frequency was significantly higher than tumors that were less than 5 cm (56% vs 13.79%, P = 0.01). On D4S1534 locus, LOH was significantly associated with liver metastasis (80% vs 17.25%, P = 0.012). No relationship was detected on other locus compared with clinicopathologial features. CONCLUSION: By high resolution deletion mapping, two high frequency regions of LOH (4q12-21.1 and 4q25-31.1) were detected, which may contribute to locate TSGs on chromosome 4q involved in carcinogenesis and progression of sporadic colorectal carcinoma.

关键词： Loss of heterozygosity Colorectal carcinoma, Chromosome 4q Tumor suppressor gene

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Diffusion tensor imaging reveals brain structure changes in dogs after spinal cord injury

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Neural Regeneration Research 2023年第1期18卷 176-182页

作者： Chang-Bin liu De-Gang Yang Jun li Chuan Qin Xin Zhang Jun liu da-peng li Jian-Jun li Department of Rehabilitation Medicine Beijing Tiantan HospitalCapital Medical UniversityBeijingChina Department of Spinal and Neural Function Reconstruction China Rehabilitation Research CenterBeijingChina China Rehabilitation Science Institute BeijingChina Department of Neurosurgery Beijing Children’s HospitalCapital Medical UniversityNational Center for Children’s HealthBeijingChina

Based on the Wallerian degeneration in the spinal cord pathways,the changes in synaptic connections,and the spinal cord-related cellular responses that alter the cellular structure of the brain,we presumed that brain diffusion tensor imaging(DTI)parameters may change after spinal cord ***,the dynamic changes in DTI parameters remain *** established a Beagle dog model of T10 spinal cord contusion and performed DTI of the injured spinal *** found dynamic changes in DTI parameters in the cerebral peduncle,posterior limb of the internal capsule,pre-and postcentral gyri of the brain within 12 weeks after spinal cord *** then performed immunohistochemistry to detect the expression of neurofilament heavy polypeptide(axonal marker),glial fibrillary acidic protein(glial cell marker),and NeuN(neuronal marker).We found that these pathological changes were consistent with DTI parameter *** findings suggest that DTI can display brain structure changes after spinal cord injury.

关键词： spinal cord injury diffusion tensor imaging canines pathophysiology cerebrospinal structures corticospinal tract magnetic resonance imaging anisotropic fraction apparent dispersion coefficient

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Effect of H_2S concentration on the corrosion behavior of pipeline steel under the coexistence of H_2S and CO_2

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International Journal of Minerals,Metallurgy and Materials 2014年第4期21卷 388-394页

作者： da-peng li Lei Zhang Jian-wei Yang Min-xu Lu Jin-hui Ding Ming-liang liu Institute of Advanced Materials and Technology University of Science and Technology Beijing Shougang Research Institute of Technology

The effect of H2S concentration on H2S/CO2 corrosion of API-X60 steel was studied by scanning electron microscopy, a weight-loss method, potentiodynamic polarization tests, and the electrochemical impedance spectroscopy technique. It is found that the cor-rosion process of the steel in an environment where H2S and CO2 coexist at different H2S concentrations is related to the morphological structure and stability of the corrosion product film. With the addition of a small amount of H2S, the size of the anode reaction region is de-creased due to constant adsorption and separation of more FeS sediment or more FeHS＋ions on the surface of the steel. Meanwhile, the dou-ble-layer capacitance is diminished with increasing anion adsorption capacity. Therefore, the corrosion process is inhibited. The general cor-rosion rate of the steel rapidly decreases after the addition of a small amount of H2S under the coexistence of H2S and CO2. With a further increase in H2S concentration, certain parts of the corrosion product film become loose and even fall off. Thus, the protection provided by the corrosion product film worsens, and the corrosion rate tends to increase.

关键词： pipeline steel hydrogen sulfide carbon dioxide corrosion corrosion rate electrochemical properties

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Hydrothermal Synthesis of AgLnMo_2O_8(Ln=La,Nd,Eu) Hierarchical Structures:Growth Mechanism and Photoluminescence Property

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Chemical Research in Chinese Universities 2010年第4期26卷 505-508页

作者： YUAN Rui-rui WU da-peng JIANG Yi li Xia ZHAO Min JIANG Kai College of Chemistry and Environmental Science Henan Normal University Xinxiang 453007 P. R. China

Uniform ofAgLnMo2O8（Ln=La, Nd, Eu） hierarchical architectures were firstly synthesized via a facile hydrothermal method. These three dimensional architectures were assembled from primary micro-rods and the average diameter was about 5 μm. According to the time-depend experiments, a possible growth mechanism was proposed to be a self-assembling process followed by an Ostwald ripening step. The concentrations of precursor and pH value were also found to have great influences on the final morphologies of the products. In addition, the photolumines- cence properties of the products were investigated.

关键词： Nanomaterial Hydrothermal synthesis Self-assemble Photoluminescence

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Are there tumor suppressor genes on chromosome 4p in sporadic colorectal carcinoma?

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World Journal of Gastroenterology 2008年第1期14卷 90-94页

作者： Hai-Tao Zheng li-Xin Jiang Zhong-Chuan Lv da-peng li Chong-Zhi Zhou Jian-Jun Gao lin He Zhi-Hai peng Departmentof Abdominal Surgery The Affiliated Yantai YuhuangdingHospital of Qingdao University Medical College Yantai 264000Shangdong Province China Department ofGeneral Surgery The Affiliated Shanghai First People's Hospitalof Shanghai Jiaotong University Shanghai 200080 China Shanghai Bio-X Center ShanghaiJiaotong University Shanghai 200031 China

AIM: To study the candidate tumor suppressor genes (TSG) on chromosome 4p by detecting the high frequency of loss of heterozygosity (LOH) in sporadic colorectal carcinoma in Chinese ***: Seven fluorescent labeled polymorphic microsatellite markers were analyzed in 83 cases of colorectal carcinoma and matched normal tissue DNA by PCR. PCR products were eletrophoresed on an ABI 377 DNA sequencer. Genescan 3.7 and Genotype 3.7 software were used for LOH scanning and analysis. The same procedure was performed by the other six microsatellite markers spanning D4S3013 locus to make further detailed deletion mapping. Comparison between LOH frequency and clinicopathological factors was performed by χ2 ***: data were collected from all informative loci. The average LOH frequency on 4p was 24.25%, and 42.3% and 35.62% on D4S405 and D4S3013 locus, respectively. Adjacent markers of D4S3013 displayed a low LOH frequency (linicopathologial ***: By deletion mapping, two obvious high frequency LOH regions spanning D4S3013 (4p15.2) and D4S405 (4p14) locus are detected. Candidate TSG, which is involved in carcinogenesis and progression of sporadic colorectal carcinoma on chromosome 4p, may be located between D4S3017 and D4S2933 (about 1.7 cm).

关键词： Loss of heterozygosity Colorectal carcinoma Chromosome 4p Tumor suppressor gene

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APPliCATION OF TIME-VARYING VISCOUS GROUT IN GRAVEL-FOUNdaTION ANTI-SEEPAGE TREATMENT

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Journal of Hydrodynamics 2011年第3期23卷 391-397页

作者： CHENG peng-da li Lu TANG Ju WANG dao-zeng Shanghai Institute of Applied Mathematics and Mechanics Shanghai university Shanghai 200072 China Beijing Wangleihong Foundation Project Co. Ltd Beijing 100071 China Shanghai Institute of Applied Mathematics and Mechanics Shanghai university Shanghai 200072 China

The time-varying viscosity of common grout and the controllable grout are measured with a rotation viscometer in experiments. The time-varying viscosity of grout is analyzed according to the characteristics in the process of anti-seepage treatment for gravel foundation. The principle of effective stress for porous medium is applied to analyzes the fluid-structure coupling in grouting. In the consideration of coupling physical variables, dynamic models of porosity, permeability and viscosity are constructed. The diffusion radius can thus be defined by the foundational porosity. The distribution of holes in field experiments is designed according to the diffusion radius of grout. Then, the permeability test is designed to verify the grout effect. The calculated diffusion radius coincides with experimental results, and the permeability meets the requirements of the project, which is valuable for the anti-seepage treatment in gravel foundation.

关键词： fluid-structure coupling viscosity gravel foundation

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TPX2 promotes migration and invasion of human breast cancer cells

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Asian Pacific Journal of Tropical Medicine 2015年第12期8卷 1033-1037页

作者： Yong Yang da-peng li Na Shen Xiao-Cheng Yu Jie-Bao li Qi Song Jia-Heng Zhang Department of Breast and Thyroid Surgery Wuhan No.1 Hospital Department of Head and Neck Surgery Thyroid and Neck OncologyTianjin Medical University Cancer Institute and Hospital Department of Breast and Thyroid Surgery Union Hospital Affiliated To Huazhong University of Science and Technology

Objective:To investigate the expression of targeting protein for Xenopus kinesin-like protein 2(TPX2) in breast cancer tissue and to explore its role in proliferation,migration and invasion of breast cancer ***:The mRNA and protein expressions of TPX2 in breast cancer tissue and cell lines were assessed by quantitative RT-PCR and Western *** effect of TPX2 with RNA interference on proliferation,invasion and migration of breast cancer cells was observed by MTT and Transwell ***:Both mRNA and protein expressions of TPX2 were upregulated in breast cancer tissues compared to tumor-adjacent ***2 expression was also upregulated in breast cancer cell lines,and the TPX2 interfered by small interfering RNA could inhibit the proliferation,invasion and migration of breast cancer cells by inhibiting matrix metalloproteinase-2 and matrix ***:Significantly upregulated TPX2 expression is observed in breast cancer tissue and cells,and contributes to promote the proliferation,migration and invasion of breast cancer cells.

关键词： Breast cancer TPX2 Proliferation Migration Invasio

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