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Effect of Modification Treatment for Reduction of Dephosphorization Slag in Hot Metal Bath

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Journal of Iron and Steel Research International 2013年第1期20卷 1-6,20页

作者： JIANG mao-fa CUI Yu-yuan WANG De-yong min yi LIU Cheng-jun Institute of Ferrous Metallurgy School of Materials and MetallurgyNortheastern University

To extract the valuable elements from the steel slag, a novel approach has been proposed by modification treatment to provide the stronger driving forces and accelerate the reduction. Three types of dephosphorization steel slags were reduced using carbon-saturated iron bath to extract iron and phosphorus simultaneously. During the process of reduction, slag composition, temperature, and original P2O5 content were investigated respectively. Slag modification treatment, adding either silica or alumina to vary the slag composition, was proven to accelerate the reduction of dephosphorization slag. The equilibrium time can be shortened from 60 to 30 min. Slag modification also allowed the reduction reaction to occur at lower temperature. After slag modification, the original P2O5 content in slag presents a slight difference on reduction process. Almost half of the reduced phosphorus was vaporized within 5 and 20 min. As more and more FeO was reduced, CO gas generation decreased, and evaporation amount of phosphorus therefore decreases.

关键词： dephosphorization slag reduction modification treatment phosphorus vaporization

肌肉生长抑制素在慢性阻塞性肺疾病合并肺动脉高压患者血浆中的表达及意义

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中国现代医学杂志 2018年第10期28卷 78-83页

作者：王同生苏秀丽孙瑜霞毛毅敏曲红培河南科技大学第一附属医院(河南科技大学临床医学院) 河南洛阳471003

目的研究肌肉生长抑制素在慢性阻塞性肺疾病(COPD)合并肺动脉高压(PH)患者中的表达水平。分析肌肉生长抑制素与COPD合并PH的关系。方法 59例COPD合并PH患者和166例COPD无PH患者,检测肌肉生长抑制素和脑钠肽(BNP)水平。心脏彩超评估右心... 详细信息

目的研究肌肉生长抑制素在慢性阻塞性肺疾病(COPD)合并肺动脉高压(PH)患者中的表达水平。分析肌肉生长抑制素与COPD合并PH的关系。方法 59例COPD合并PH患者和166例COPD无PH患者,检测肌肉生长抑制素和脑钠肽(BNP)水平。心脏彩超评估右心室功能和形态,心脏多普勒检测肺动脉压力(SPAP),SPAP≥40 mm Hg被确定为PH,三尖瓣瓣环收缩期偏移(TAPSE)≤16 mm为右心功能不全。检查肺功能、动脉血气、6 min步行距离。结果收录225例COPD患者,COPD合并PH患者占26.2%(59/225);COPD合并PH组肌肉生长抑制素和BNP水平高于COPD无PH组,两组肌肉生长抑制素水平分别是中位数16.4和12.8 ng/L,差异有统计学意义(P<0.05);BNP水平分别是(147.87±42.98)和(114.61±53.47)pg/ml,差异有统计学意义(P<0.05);相关分析:BNP和肌肉生长抑制素呈正相关;肌肉生长抑制素和SPAP呈正相关;肌肉生长抑制素与TAPSE和右室心肌性能指标相关(P<0.05);BNP只与SPAP呈正相关(P<0.05)。结论 COPD合并PH患者,血浆肌肉生长抑制素水平增加,与血浆BNP水平比较,在评估右心功能及肺动脉高压方面,肌肉生长抑制素水平有更强的相关性。肌肉生长抑制素可能优于BNP对COPD合并肺动脉高压的早期诊断。

关键词：慢性阻塞性肺疾病肺动脉高压肌肉生长抑制素脑钠肽

FAST IMPLEMENTATION OF ORTHOGONAL EMPIRICAL MODE DECOMPOSITION AND ITS APPLIGA-TION INTO HARMONIC DETECTION

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Chinese Journal of Mechanical Engineering 2008年第2期21卷 93-98页

作者： QIN yi QIN Shuren mao Yongfang College of Mechanical Engineering Chongqing University Chongqing 400044 China

Since the empirical mode decomposition （EMD） lacks strict orthogonality, the method of orthogonal empirical mode decomposition （OEMD） is innovationally proposed. The primary thought of this method is to obtain the intrinsic mode function （IMF） and the residual function by auto-adaptive band-pass filtering. OEMD is proved to preserve strict orthogonality and completeness theoretically, and the orthogonal basis function of OEMD is generated, then an algorithm to implement OEMD fast, IMF binary searching algorithm is built based on the point that the analytical band-pass filtering preserves perfect band-pass feature in the frequency domain. The application into harmonic detection shows that OEMD successfully conquers mode aliasing, avoids the occurrence of false mode, and is featured by fast computing speed. Furthermore, it can achieve harmonic detection accurately combined with the least square method.

关键词： Empirical mode decomposition Orthogonal empirical mode decomposition Analytic band-pass filtering Binary searching Harmonic detection

Suppression of matrix metalloproteinase-2 via RNA interference inhibits pancreatic carcinoma cell invasiveness and adhesion

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World Journal of Gastroenterology 2009年第9期15卷 1072-1078页

作者： ying-Hui Zhi mao-min Song Pi-Lin Wang Tie Zhang Zi-yi yin Department of General Surgery Affiliated Beijing Tiantan Hospital Capital Medical University Beijing 100050 China

AIM:To investigate the inhibitory effects of RNA interference (RNAi) on expression of matrix metalloproteinase-2 (MMP-2) gene and invasiveness and adhesion of human pancreatic cancer cell line,***:RNAi was performed using the vector (pGPU6)-based small interference RNA (siRNA) plasmid gene silence system to specifically knock down MMP-2 expression in pancreatic cancer cell line,BxPC-3. Four groups of different specific target sequence in coding region of MMP-2 and one non-specific sequence were chosen to construct four experimental siRNA plasmids of pGPU6-1,pGPU6-2,pGPU6-3 and pGPU6-4,and one negative control siRNA plasmid of pGPU6 (-). MMP-2 expression was measured by reverse transcription polymerase chain reaction (RT-PCR) and Western blot. Cell proliferation and apoptosis were examined by methyl thiazolyl tetrazolium (MTT) and flow cytometry,respectively. The abilities of adhesion and invasion were detected by cell adhesion assay and cell invasion assay using Transwell ***:The expression of MMP-2 was inhibited and the inhibitory effects of different sequence varied. pGPU6-1 group had the most efficient inhibitory effect,followed by pGPU6-2 and pGPU6-3 *** and adhesion were more significantly reduced in pGPU6-1,pGPU6-2 and pGPU6-3 groups as compared with pGPU6 (-) and blank control groups. However,no difference concerning cell proliferation and apoptosis was observed after transfection between experiment groups and control ***:RNAi against MMP-2 successfully inhibited the mRNA and protein expression of MMP-2 in the pancreatic cancer cell line,BxPC-3,leading to a potent suppression of tumor cell adhesion and invasion without affecting cell proliferation and apoptosis. These findings suggest that the RNAi approach towards MMP-2 may be an effective therapeutic strategy for the clinical management of pancreatic tumor.

关键词： Pancreatic neoplasm Tumor metastasis Matrix metalloproteinase-2 Small interfering RNA Tumor invasiveness

Demodulation Based on Harmonic Wavelet and Its Application into Rotary Machinery Fault Diagnosis

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Chinese Journal of Mechanical Engineering 2009年第3期22卷 419-425页

作者： mao Yongfang QIN Shuren QIN yi College of Automation Chongqing Univers#y Chongqing 400030 China

The harmonic wavelet transform（HWT） and its fast realization based on fast Fourier transform（FFT） are introduced. Its ability to maintain the same amplitude-frequency feature is revealed. A new method to construct the time-frequency（TF） spectrum of HWT is proposed, which makes the HWT TF spectrum able to correctly reflect the time-frequency-amplitude distribution of the signal. A new way to calculate the HWT coefficients is proposed. By zero padding the data taken out, the non-decimated coefficients of HWT are obtained. Theoretical analysis shows that the modulus of the coefficients obtained by the new calculation way and living at a certain scale are the envelope of the component in the corresponding frequency band. By taking the cross section of the new TF spectrum, the demodulation for the component at a certain frequency band can be realized. A comparison with the Hilbert demodulation combined with band-pass filtering is done, which indicates for multi-components, the method proposed here is more suitable since it realizes ideal band-pass filtering and avoids pass band selecting. In the end, it is applied to bearing and gearbox fault diagnosis, and the results reflect that it can effectively extract the fault features in the signal.

关键词： harmonic wavelet transform time-frequency spectrum demodulation rotary machinery fault diagnosis

Development of a MCNP5 and ORIGEN2 based burnup code for molten salt reactor

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Nuclear Science and Techniques 2016年第3期27卷 108-114页

作者： Guo-min Sun mao-Song Cheng Shanghai Institute of Applied Physics Chinese Academy of SciencesShanghai 201800China University of Chinese Academy of Sciences Beijing 100049China

The Molten Salt Reactor(MSR) is one of the six advanced reactor nuclear energy systems for further research and development selected by Generation IV International Forum(GIF),which is distinguished by its core in which the fuel is dissolved in molten fluoride *** fuel flow in the primary loop,the depletion of MSR is different from that of solid-fuel *** this paper,an MCNP5 and ORIGEN2 Coupled Burnup(MOCBurn) code for MSR is developed under the MATLAB *** new methods and novel arrangements are used to make it suitable for fuel flow in the *** consider the fuel convection and diffusion in the primary loop of MSR,fuel mixing calculation is carried out after each burnup time *** function for geometry with repeat structures is implicated for reactor analysis with complex *** for a high-burnup reactor pin cell benchmark is performed using the MOCBurn *** of depletion study show that the MOCBurn code is suitable for the traditional solid-fuel reactors.A preliminary study of the fuel mixture effect in MSR is also carried out.

关键词：程序开发高燃耗熔盐堆 MATLAB平台先进反应堆固体燃料重复结构 MSR

Periodic Solutions of Nonautonomous Second Order Hamiltonian Systems

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Acta Mathematica Sinica,English Series 2005年第4期21卷 685-690页

作者： Shi Xia LUAN An min mao Department of Mathematics Qufu Normal University Qufu 273165. P. R. China Institute of Mathematics Academy of Mathematics and Systems Science Chinese Academy of Sciences. Beijing 100080. P. R. China

In this paper, we develop the local linking theorem given by Li and Willein by replacing the Palais-Smale condition with a Cerami one, and apply it to the study of the existence of periodic solutions of the nonautonomous second order Hamiltonian systems （H） ü＋A（t）u＋∨V（t, u）=0, u∈R^N, t∈R. We handle the case of superquadratic nonlinearities which differ from those used previously. Our results extend the theorems given by Li and Willem.

关键词： Non-autonomous Hamiltonian systems Periodic solutions Local linking Critical point theory Variational method

Existence of Multiple solutions for semilinear elliptic equations in the annulus

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Applied Mathematics(A Journal of Chinese Universities) 2009年第3期24卷 263-268页

作者： mao An-min MO Xiu-ming School of Mathematical Sciences Qufu Normal University Qufu 273165 China Department of Biotechnology Beijing City University Beijing 100094 China

The existence of radial solutions of Δu ＋ λg（｜x｜）f（u） = 0 in annuli with Dirichlet（Dirichlet/Neumann） boundary conditions is *** is proved that the problems have at least two positive radial solutions on an... 详细信息

关键词： fixed point index Dirichlet problems annulus

Structure and mechanical properties of nc-TiC/a-C:H nanocomposite films deposited by filtered cathodic arc technique

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Rare Metals 2016年第2期35卷 177-183页

作者： Yu-Hao Zhai Yu-Juan Zhang yi Peng Sheng-mao Zhang Ping-Yu Zhang Xiao-min Zhang Key Laboratory of ministry of Education for Special Functional Materials Henan University College of Materials and mineral Resources Xi’an University of Architecture and Technology

nc-Ti C/a-C：H nanocomposite films were prepared by filtered cathodic arc technique. The influence of C_2H_2/Ar flow ratio on the composition, structure, and mechanical properties of films was investigated by X-ray photoelectron spectroscopy（XPS）, X-ray diffraction（XRD）, Fourier transform infrared spectroscopy（FTIR）,Raman spectroscopy, nanoindentation, and ball-on-disc tribometry. The films show a nanocomposite structure in which Ti C crystallites are embedded in the amorphous matrix of a-C：H phase. C content in films increases with the flow ratio of C_2H_2/Ar, simultaneously, the crystallite size of TiC decreases. Contrary to the nc-Ti C/a-C：H films deposited by magnetron sputtering in which the sp3 C content increases with C_2H_2 flow rate, the increase of C_2H_2 flow rate leads to the increase of sp2 C content in films deposited by filtered cathodic arc technique. The nc-Ti C/a-C：H films deposited by cathodic arc technique have a pronounced hardness maximum of 30 GPa under the C_2H_2/Ar flow ratio of 12. Tribological performance of films is controlled by the sp2 content in films. Higher sp2 content promotes the formation of graphite-like transfer layer during sliding,and results in lower wear rate and friction coefficient.

关键词： Nanocomposite films Tribological performance Hardness