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稀土铈对20CrMnTi钢中TiN相析出热力学计算及分析

The International Conference on Advances in Chemical Technologies for Water and Wastewater Treatment

作者： YIN jun~(1 2) ZHAO Yu-xin~(1 2) WANG jian-han~2 ~1 school of Municipal and environmental Engineering Harbin Institute of Technology Harbin 150090 china ~2 jiLin Province Key Laboratory of Water Pollution Control and resources Reuse Jilin Architectural and Civil Engineering Institute Changchun 130021 china

＜正＞With the increasing demand for high efficiency and safety sludge treatment technology,an advanced sludge treatment process combining hydrogen peroxide and ozone was *** impacts of different pH value,ratio of hydrogen peroxide to ozone and the original sludge concentration on sludge disintegration were *** on the analysis of different parameters,soluble total organic carbon and particle chemical oxygen demand were selected as the indicator of sludge *** a result,it can be concluded that the combination of hydrogen peroxide and ozone process had a good performance when the molar ratio of hydrogen peroxide to ozone was 1.2 and the pH value was at the range of 6～*** increase of sludge initial concentration was benefit for sludge *** this study,the identical initial concentration of sludge was 9,850～20,000mg/*** addition,experimental results also indicated that the hydrolysis of sludge could be used as an alternative carbon source for nitrogen removal and the average rate of COD consumption of sludge supernatants was 7.67mgCOD/gMLSS·h.

关键词： Advanced oxidation process Sludge solubilisation Hydrogen peroxide/Ozone Carbon source Denitrification

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钢铁 2024年第4期59卷 66-73,84页

作者：王健彭军张芳彭继华刘爽安胜利内蒙古科技大学材料与冶金学院内蒙古包头014000 内蒙古自治区先进陶瓷材料与器件重点实验室(内蒙古科技大学) 内蒙古包头014010 教育部轻稀土资源绿色提取与高效利用重点实验室(内蒙古科技大学) 内蒙古包头014010 内蒙古科技大学稀土产业学院内蒙古包头014010

TiN夹杂物尺寸和形貌对20CrMnTi齿轮钢产品质量、服役性能均有影响,控制TiN析出尺寸及形貌是提高20CrMnTi钢服役稳定性的关键。利用计算及试验等方法,对添加稀土铈元素前后20CrMnTi钢中TiN夹杂形核行为进行了研究。并对钢中夹杂物形貌... 详细信息

TiN夹杂物尺寸和形貌对20CrMnTi齿轮钢产品质量、服役性能均有影响,控制TiN析出尺寸及形貌是提高20CrMnTi钢服役稳定性的关键。利用计算及试验等方法,对添加稀土铈元素前后20CrMnTi钢中TiN夹杂形核行为进行了研究。并对钢中夹杂物形貌、种类、尺寸等进行了表征及统计分析;研究了稀土铈对20CrMnTi钢中TiN夹杂物改质的行为机理。结果表明,热力学计算TiN析出温度为1744 K。温度为1873 K时,钢液中无法析出TiN等夹杂物,即TiN只能在钢液凝固过程中析出长大。当钢中钛质量分数大于0.03%时,Ti-N平衡趋于平缓,温度对其析出影响相对较小,并且20CrMnTi钢中析出的TiN易富集长大形成大尺寸含钛夹杂物。加入稀土铈元素后,钢中会形成Ti、O、Ce、Al、N等元素富集的复合相,该复合相棱角收缩,外形为球形或者椭球形状,较TiN、Al_(2)O_(3)-TiN夹杂物尺寸更小。经相鉴定分析可知,该复合相为钢中稀土铈与Al_(2)O_(3)反应生成的CeAlO_(3),可作为TiN夹杂物的形核核心,形成椭球型的CeAlO_(3)-TiN复合夹杂物,进而达到改质含钛夹杂物的目的。铈元素加入后,钢中含TiN夹杂物总面积并没有减小,但形成了更为细小的含TiN复合相CeAlO_(3)-TiN。因形成尺寸更小的复合夹杂物CeAlO_(3)-TiN,使钢中尺寸大于5μm夹杂物占比降低了17.2%,细化了钢中含TiN夹杂物,有效减小了钢中TiN夹杂物尺寸,从形貌和尺寸上,达到改质钢中TiN的效果。

关键词：齿轮钢稀土铈微合金化夹杂物形核核心

Hydrogen Embrittlement of Advanced High-Strength Steel for Automobile Application:A Review

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Acta Metallurgica Sinica(English Letters) 2023年第7期36卷 1144-1158页

作者： Ming-tu Ma Ke-jian Li Yu Si Peng-jun Cao Hong-Zhou Lu Ai-Min Guo Guo-Dong Wang State Key Laboratory of Vehicle NVH and Safety Technology Chongqing 401122China china Automotive Engineering Research Institute Co. Ltd.Chongqing 401122China school of Metallurgy and Materials Engineering Chongqing University of Science&TechnologyChongqing 401331China CITIC Metal Co.Ltd Beijing 100004China RAL of Dongbei university Shenyang 110819China

The hydrogen embrittlement(HE)fracture of advanced high-strength steels used in lightweight automobiles has received increasing public *** source,transmission,and movement of hydrogen,characterization parameters,and test methods of HE,as well as the characteristics and path of HE fractures,are *** mechanisms and modes of crack propagation of HE and hydrogen-induced delayed fracture are *** recent progress surrounding micro and macro typical fracture characteristics and the influencing factors of HE are ***,methods for improving HE resistance can be summarized as follows:(1)reducing crystalline grain and inclusion sizes(oxides,sulfides,and titanium nitride),(2)controlling nano-precipitates(niobium carbide,titanium carbide,and composite precipitation),and(3)increasing residual austenite content under the reasonable tension strength of steel.

关键词： Hydrogen embrittlement High-strength steel Hydrogen-induced delayed cracking Hydrogen trapping Residual austenite

Carbide dissolution and austenite grain growth behavior of a new ultrahigh-strength stainless steel

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Journal of Iron and Steel Research International 2020年第6期27卷 732-741页

作者： Zhen-bao Liu Xin tu Xiao-hui Wang jian-xiong Liang Zhi-yong Yang Yong-qing Sun Chang-jun Wang Institute for Special Steel Institute Central Iron and Steel Research InstituteBeijing 100081China school of Metallurgical and Ecological Engineering University of Science and Technology BeijingBeijing 100083China

The isothermal grain growth behavior for a new ultrahigh-strength stainless steel (UHSSS) is investigated in temperature range from 900 to 1150 ℃ and holding time range from 0 to 20 min. In the temperature range from 1000 to 1050 ℃, a bimodal grain size distribution was induced by different austenite grain growth rates which resulted from the weakened pin-ning effect by the partial dissolution of M6C particles along austenite grain boundaries. Further raising heating temperatures, M6C particles almost dissolved and the bimodal grain size distribution phenomenon became weakened, indicating that the austenite grain coarsening temperature of the new UHSSS was close to 1050 ℃. According to the present experimental results, a pragmatic mathematical model based on the Arrhenius equations was developed to predict the austenite grain growth process, which elaborated the influence of heating temperature, holding time and initial grain size on the austenite grain growth. Predictions for the new UHSSS presented a good agreement with experimental results.

关键词： Ultrahigh-strength stainless steel Austenite grain growth Mathematical model M6C particle

GABAB Receptor-mediated PI3K/Akt Signaling Protects Neurons from Apoptosis Via Rransactivation of Insulin Like Growth Factor 1 Receptor

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GABAB Receptor-mediated PI3K/Akt Signaling Protects Neurons ...

Precision measurement of the Newtonian gravitational constant

2008年全国生物化学与分子生物学学术大会

作者： Hai-jun tu Chan-juan Xu Wen-hua Zhang Qiu-yao Liu jian-feng Liu (Sino-France Laboratory for Drug Screening,Key Laboratory of Molecular Biophysics(Huazhong university of science and Technology),Ministry of Education,school of Life science and Technology,Huazhong university of science and Technology Wuhan,430074,Hubei,china.)

γ-amidobutyric acid (GABA) is a major inhibitory neurotransmitter in the central nervous system and medi- ates fast synaptic inhibition through GABA and GABA ionotropic receptors as well as slow and prolonged synaptic inhibition through the metabotropic GABA *** receptors mediate both presynaptic inhibition of neurotransmitter release and post-synaptic inhibition of neuronal excitability.

关键词：

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National science Review 2020年第12期7卷 1803-1817页

作者： Chao Xue jian-Ping Liu Qing Li jun-Fei Wu Shan-Qing Yang Qi Liu Cheng-Gang Shao Liang-Cheng tu Zhong-Kun Hu jun Luo Tian Qin Research Center for Gravitational Physics & school of Physics and Astronomy Sun Yat-sen University(Zhuhai Campus) MOE Key Laboratory of Fundamental Physical Quantities Measurement & Hubei Key Laboratory of Gravitation and Quantum Physics PGMF and School of PhysicsHuazhong University of Science and Technology

The Newtonian gravitational constant G,which is one of the most important fundamental physical constants in nature,plays a significant role in the fields of theoretical physics,geophysics,astrophysics and *** G was the first physical constant to be introduced in the history of science,it is considered to be one of the most difficult to measure accurately so *** the past two decades,eleven precision measurements of the gravitational constant have been performed,and the latest recommended value for G published by the Committee on Data for science and Technology(CODATA) is(6.674 08 ±0.000 31) × 10m~3 kgswith a relative uncertainty of 47 parts per *** uncertainty is the smallest compared with previous CODATA recommended values of G;however,it remains a relatively large uncertainty among other fundamental physical *** this paper we briefly review the history of the G measurement,and introduce eleven values of G adopted in CODATA 2.1. after 2000 and our latest two values published in 2.1. using two independent methods.

关键词： precision measurement Newtonian gravitational constant CODATA

RRM1 gene expression in peripheral blood is predictive of shorter survival in Chinese patients with advanced non-small-cell lung cancer treated by gemcitabine and platinum

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Journal of Zhejiang university-science B(Biomedicine & Biotechnology) 2011年第3期12卷 174-179页

作者： Lin-run WANG Guo-bing ZHANG jian CHEN jun LI Ming-wei LI Nong XU Yang WANG jian-zhong SHEN tu4 Department of Pharmacy the First Affiliated Hospital School of Medicine Zhejiang University Hangzhou 310003 China State Key Laboratory for Diagnosis and Treatment of Infectious Diseases Department of Infectious Diseases the First Affiliated Hospital School of Medicine Zhejiang University Hangzhou 310003 China Department of Medical Oncology the First Affiliated Hospital School of Medicine Zhejiang University Hangzhou 310003 China Clinical Laboratory the First Affiliated Hospital School of Medicine Zhejiang University Hangzhou 310003 China

Objective:To evaluate the predictive values of gene expressions of ribonucleotide reductase M1(RRM1) and breast cancer susceptibility gene 1(BRCA1) in peripheral blood from Chinese patients with non-small-cell lung cancer(NSCLC) treated with gemcitabine plus ***:Forty Chinese patients with advanced NSCLC were recruited and received gemcitabine 1200 mg/m 2 on Days 1 and 8 plus carboplatin AUC 5 on Day ***1 and BRCA1 expression levels in peripheral blood were detected by quantitative reverse transcription-polymerase chain reaction(RT-PCR) .Kaplan-Meier survival curve and log-rank test were performed to evaluate the correlation between gene expression and overall survival for these ***:No correlation was observed between gene expression of RRM1 and that of BRCA1(P>0.05) ,but there was a strong correlation between the expression of RRM1 and the response to chemotherapy(P=0.003) .Subjects with low RRM1 expression levels in peripheral blood had longer sur-vival time than those with high RRM1 expression levels(16.95 vs.12.76 months,log-rank 3.989,P=0.046) .However,no significant association between BRCA1 expression levels and survival time was found(16.80 vs.13.77 months,log-rank 0.830,P=0.362) .Conclusions:Patients with low RRM1 expression levels in peripheral blood have a greater response to chemotherapy and longer survival *** NSCLC patients with low RRM1 expression levels may benefit from gemcitabine plus platinum ***1 mRNA expression in peripheral blood could be used to predict the prognosis of NSCLC treated by gemcitabine and platinum.

关键词： Gemcitabine Non-small-ce Ribonucleotide reductase M1 (RRM1) Breast cancer susceptibility gene 1 (BRCA1) ung cancer (NSCLC) Gene expression

Influences of Floater Motion on Gap Resonance Triggered by Focused Wave Groups

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中国海洋工程:英文版 2023年第4期37卷 685-697页

作者： GAO jun-liang LYU Jing ZHANG jian ZANG jun school of Naval Architecture and Ocean Engineering Jiangsu University of Science and TechnologyZhenjiang 212100China Key Laboratory of Port Waterway and Sedimentation Engineering of MOTNanjing Hydraulic Research InstituteNanjing 210029China Key Laboratory of Water Security Guarantee in Guangdong-Hong Kong-Marco Greater Bay Area of Ministry of Water resources Guangzhou 510611China Centre for Infrastructure Geotechnical and Water Engineering(IGWE)Department of Architecture and Civil EngineeringUniversity of BathBA27AYUK

The current study investigates the hydrodynamic characteristics of gap resonance within a narrow gap formed by two adjacent boxes subjected to incident focused transient wave groups.A two-dimensional(2D)numerical wave tank based on the OpenFOAM package is utilized for this *** weather-side box is fixed while the lee-side box is allowed to heave freely under wave *** effects of the focused wave amplitude and spectral peak period on the wave amplification within the gap,motion of the lee-side box,and wave forces(including horizontal and vertical wave forces)acting on each box are systematically *** comparison,another structural layout consisting of two fixed boxes is also *** results reveal that the release of the heave degree of freedom(DoF)of the lee-side box results in remarkably distinct resonance *** the heave-box system,both its fluid resonant period and the period corresponding to the maximum heave displacement of the lee-side box are significantly larger(i.e.,1.6-1.7 times)than the fluid resonant period of the fixed-box ***,the wave amplification factor inside the gap in the heave-box system is significantly lower than that in the fixed-box *** the variations of the maximum horizontal and vertical wave forces with the spectral peak period and their magnitudes are also significantly different between the two structural systems.

关键词： gap resonance focused waves wave amplification wave forces OpenFOAM

湖南彭家坳至集里高速公路建设期间对生态环境影响的评析

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水土保持研究 2005年第6期12卷 46-49页

作者：刘永兵杨峰春周利军杨光和克俭北京师范大学资源学院环境演变与自然灾害教育部重点实验室北京100875 山西省保德县经贸局山西保德036600 北京林业大学水土保持学院北京100083

公路建设的生态环境保护是开发建设项目中一个极其重要的任务。从土地资源、水土流失、生物资源、景观等环境要素对湖南彭家坳至集里高速公路工程建设引起的生态环境问题进行了分析与评价。认为公路建设对于土地利用、土地利用类型等因... 详细信息

公路建设的生态环境保护是开发建设项目中一个极其重要的任务。从土地资源、水土流失、生物资源、景观等环境要素对湖南彭家坳至集里高速公路工程建设引起的生态环境问题进行了分析与评价。认为公路建设对于土地利用、土地利用类型等因素的影响不大,而对于土壤理化性质及水土流失等影响较大;对于生物资源的影响不大;新的景观环境可以增加各种流的连通度,但也造成景观破碎程度增加。针对公路建设形成的生态环境影响形式与影响程度,结合公路建设项目区的自然环境特征,提出了科学的、合理的、切实可行的生态环境修复技术措施。

关键词：生态环境土地资源水土流失景观环境