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Distribution of reformed coke oven gas in a shaft furnace

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Journal of Iron and Steel Research International 2020年第12期27卷 1382-1390页

作者： Xin Jiang Jia-xin Yu Lin Wang Dong-wen Xiang Qiang-jian Gao Hai-yan Zheng feng-man Shen School of Metallurgy Northeastern UniversityShenyang 110819LiaoningChina Department of Mechanical Engineering Shenyang Institute of EngineeringShenyang 110136LiaoningChina

In recent years, the reformed coke oven gas (COG) was proposed to be used as reducing gas in a shaft furnace. A mathematical model of gas flow based on the reformed COG was built. The effects of the pressure ratio of reducing gas to cooling gas (k) on the gas distribution in the shaft furnace were investigated. The calculation results show that k is an important operation parameter, which can obviously affect the gas distribution in the shaft furnace. The value of k should be compromised. Both too big and too small k values are not appropriate, and the most reasonable value for k is 1:*** this condition, the utilization coefficient of reducing gas, the utilization coefficient of cooling gas and the coefficient of upward gas are 0.94, 0.92 and 1.03, respectively. Based on the validation of physical experiments, the calculated values of the model agreed well with the physical experimental data. Thus, the established model can properly describe the reformed COG distribution in an actual shaft furnace.

关键词： Direct reduction Shaft furnace Coke oven gas Gas distribution Pressure ratio Reducing gas Cooling gas

Exceptional points enhance sensing in silicon micromechanical resonators

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Microsystems & Nanoengineering 2024年第1期10卷 17-25页

作者： man-Na Zhang Lei Dong Li-feng Wang Qing-An Huang Key Laboratory of MEMS of the Ministry of Education Southeast UniversityNanjing 210096China

Exceptional points(EPs)have recently emerged as a new method for engineering the response of open physical systems,that is,systems that interact with the *** systems at the EPs exhibit a strong response to a small ***,we show a method by which the sensitivity of silicon resonant sensors can be enhanced when operated at *** our experiments,we use a pair of mechanically coupled silicon micromechanical resonators constituting a parity-time(PT)-symmetric *** perturbations introduced on the mechanically coupled spring cause the frequency to split from the EPs into the PT-symmetric regime without broadening the two spectrum linewidths,and this frequency splitting scales with the square root of the perturbation *** overall signal-tonoise ratio is still greatly enhanced,although the measured noise spectral density of the EP sensing scheme has a slight increase comparable to the traditional *** results pave the way for resonant sensors with ultrahigh sensitivity.

关键词： resonant symmetric points

Effect of MgO on Oxidation Process of Fe_3O_4 in Pellets

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Journal of Iron and Steel Research International 2016年第10期23卷 1007-1011页

作者： Qiang-jian GAO Yan-song SHEN Xin JIANG Hai-yan ZHENG feng-man SHEN Chang-sheng LIU School of Metallurgy Northeastern University School of Chemical Engineering University of New South Wales

Induration process of oxidized pellets involves the oxidation of Fe3O4 and re-crystallization of *** oxidation process of Fe3O4 is significant for pellets to obtain better ambient ***,the effect of MgO on oxidation process of Fe3O4 was *** unreacted core model was applied to analyze the oxidizing induration process of *** experimental results show that MgO plays a negative role in the oxidation process of *** oxidation rate of Fe3O4 in MgO-fluxed pellets（95.0% Fe3O4 ＋5.0% MgO）is slower than that in standard acid pellets（100% Fe3O4）.The relation between oxidation ratio of Fe3O4 and time was calculated based on the unreacted core model for both MgO-fluxed pellets and standard acid *** to verification experiments,the values calculated by model coincide well with the experimental ***,the unreacted core model could be applied to describe the oxidizing induration process of pellets.

关键词： MgO-fluxed pellet Fe3O4 oxidation unreacted core model

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一种电子水泵空转故障控制的研究与应用

汽车科技 2024年第3期 64-67,87页

作者：卜江华郑凡邓湘金永镇冯满乐岚图汽车科技有限公司武汉430050

解决的电子水泵空转误报警问题,当水泵转速超过一定数值3600rpm时,对应占空比69%,水泵自我保护进行空转自检,这时如果系统内出现一串连续气泡通过水泵时,检测到水泵的电流不足会误报空转。通过实际测试水路系统中允许最低含水量下对应... 详细信息

解决的电子水泵空转误报警问题,当水泵转速超过一定数值3600rpm时,对应占空比69%,水泵自我保护进行空转自检,这时如果系统内出现一串连续气泡通过水泵时,检测到水泵的电流不足会误报空转。通过实际测试水路系统中允许最低含水量下对应的电流值,以该电流值作为判断空转的条件之一,有效的解决了系统中由不稳定气泡产生的空转误报。

关键词：电子水泵空转报警电流含水量

Combustion characteristics of unburned pulverized coal and its reaction kinetics with CO2

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International Journal of Minerals,Metallurgy and Materials 2019年第7期26卷 811-821页

作者： Dong-wen Xiang feng-man Shen Jia-long Yang Xin Jiang Hai-yan Zheng Qiang-jian Gao Jia-xin Li School of Metallurgy Northeastern University Shenyang 110819 China School of Metallurgical Engineering Anhui University of Technology Ma’anshan 243002 China

The combustion characteristics of two kinds of unburned pulverized coal (UPC) made from bituminous coal and anthracite were investigated by thermogravimetric analysis under air. The reaction kinetics mechanisms between UPC and CO2 in an isothermal experiment in the temperature range 1000–1100°C were investigated. The combustion performance of unburned pulverized coal made from bituminous coal (BUPC) was better than that of unburned pulverized coal made from anthracite (AUPC). The combustion characteristic indexes (S) of BUPC and AUPC are 0.47 × 10^-6 and 0.34 × 10^-6 %2·min^-2·°C^-3, respectively, and the combustion reaction apparent activation energies are 91.94 and 102.63 kJ·mol^-1, respectively. The reaction mechanism of BUPC with CO2 is random nucleation and growth, and the apparent activation energy is 96.24 kJ·mol^-1. By contrast, the reaction mechanism of AUPC with CO2 follows the shrinkage spherical function model and the apparent activation energy is 133.55 kJ·mol^-1.

关键词： unburned pulverized coal combustion characteristics reactivity reaction mechanism apparent activation energy

耳穴压豆对腹腔镜胆总管切开取石+T管引流术患者术后胆汁成分的影响

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中国现代药物应用 2024年第16期18卷 132-136页

作者：郭锋满李建明陈壮浩宋巍巍陈顺中山市中医院 528400

目的分析耳穴压豆对腹腔镜胆总管切开取石+T管引流术患者术后胆汁成分的影响。方法66例胆管结石患者,随机分为对照组和观察组,每组33例。两组均予以腹腔镜胆总管切开取石+T管引流术治疗,对照组术后给予常规对症治疗,观察组在对照组基础... 详细信息

目的分析耳穴压豆对腹腔镜胆总管切开取石+T管引流术患者术后胆汁成分的影响。方法66例胆管结石患者,随机分为对照组和观察组,每组33例。两组均予以腹腔镜胆总管切开取石+T管引流术治疗,对照组术后给予常规对症治疗,观察组在对照组基础上术后给予耳穴压豆治疗。比较两组患者术后不同时间点的胆汁成分、肝功能及术后胆汁总引流量。结果观察组术后第4天胆汁中总胆红素(TBIL)、直接胆红素(DBIL)、间接胆红素(IBIL)、总胆汁酸(TBA)、钙离子(Ca^(2+))、胆固醇(CHO)分别为(520.46±110.15)μmol/L、(350.36±80.07)μmol/L、(270.45±40.06)μmol/L、(1042.34±130.05)μmol/L、(1.56±0.15)mmol/L、(4.01±0.92)mmol/L,术后第8天分别为(359.47±71.35)μmol/L、(242.24±50.34)μmol/L、(222.16±40.31)μmol/L、(1232.10±150.43)μmol/L、(1.38±0.15)mmol/L、(3.59±0.47)mmol/L;对照组术后第4天胆汁中TBIL、DBIL、IBIL、TBA、Ca^(2+)、CHO分别为(572.93±97.27)μmol/L、(390.52±69.17)μmol/L、(294.78±56.22)μmol/L、(929.48±135.27)μmol/L、(1.76±0.19)mmol/L、(4.47±0.89)mmol/L,术后第8天分别为(495.53±83.86)μmol/L、(344.41±62.06)μmol/L、(264.47±43.36)μmol/L、(1003.87±152.18)μmol/L、(1.57±0.17)mmol/L、(3.99±0.43)mmol/L。术后第4、8天,两组患者胆汁中TBIL、DBIL、IBIL、Ca^(2+)、CHO较术后第1天显著降低,且观察组低于对照组;两组患者胆汁中TBA较术后第1天显著升高,且观察组高于对照组,差异均有统计学意义(P<0.05)。术后第4、8天,两组患者谷丙转氨酶(ALT)、谷草转氨酶(AST)较术后第1天降低,且观察组低于对照组,差异有统计学意义(P<0.05);观察组术后胆汁总引流量为(2684.65±252.45)ml,多于对照组的(2135.89±295.42)ml,差异有统计学意义(P<0.05)。结论对腹腔镜胆总管切开取石+T管引流术患者术后予以耳穴压豆治疗,可改变胆汁成分及肝功能,能增加TBA及胆汁排空能力,降低胆红素和Ca^(2+)含量,效果理想。

关键词：耳穴压豆胆总管切开取石术 T管引流术胆汁成分

The Optimization of Architectural History Course of Environmental Design

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The Optimization of Architectural History Course of Environm...

The ultratrace detection of crystal violet using surface enhanced Raman scattering on colloidal Ag nanoparticles prepared by electrolysis

作者： man feng ShenYang Aerospace University College of Design and Art

Environmental design major education aims to cultivate application-oriented and research-oriented high-level design talents who are capable of integrating innovative design and can meet the needs of social and economic *** course system of architectural history theory of environmental design major is mainly based on the western modern design theory *** of both universities have opened the environmental design major,but the existing education system and the local culture and present a more obvious economic development does not adapt the characteristics:the professional training mode and market imbalances,students' professional quality and the region economy development phase deviation,not immediately into actual work after graduation,employment adjustment period is longer,such as these,reflect the environmental design professional in school-running idea,professional orientation and the problems existing in the training objectives,history gradually highlight the importance of ***,only by constantly innovation,and actively build a scientific and reasonable construction history teaching structure,the construction of regional culture inheritance of history curriculum innovation pilot,study theoretical issue in the development of contemporary architecture,environmental design education in colleges and universities can only be achieved and the coordinated development of regional cultural and economic demand,promote higher design education forward.

关键词：

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Chinese Chemical Letters 2009年第6期20卷 711-715页

作者： Ren Ming Liu Yi Pu Kang Xing Fa Zi Ming Jun feng man Cheng Min Zhen Si Application Institute of Spectroscopy Technology Chuxiong Normal University Chuxiong 675000 China

Highly active, stable and affordable surface enhanced Raman scattering （SERS） substrates were obtained by electrolyzing a mixture of AgNO3 （4 × 10^-4 mol/L） and Na3C6H5OTH2O （6 × 10^-5 mol/L） for 1, 2, 3 and 4 h at 7 V. With crystal violet （CV） as a test molecule, a portable Raman spectrometer with 785 nm laser excitation was employed to carry out the SERS detection. Colloidal Ag nanoparticles prepared by electrolyzing for 3 h with the particle size of （65 ±17） nm is a perfect SERS substrate for the ultratrace detection of CV, which displayed an enhancement factor of ca. 1.3 × 10^8 and the detection limit of CV is down to ca. 10-15 mol/L （ca. 10^-4 ppb） with 10^-1 mol/L KBr as aggregating agent. Thus, this SERS substrate will provide a hopeful foreground in ultratrace detection. Meanwhile, it will provide a possibility to bring Raman analysis out of the laboratory to process in situ, real-time detection and identification.

关键词： SERS Ultratrace detection Crystal violet Silver nanoparticle Electrolysis

A　New　Method　for　Brucine　Analysis　Based　on　Its　Chemiluminescence　Reaction　with　Potassium　Permanganat

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Chemical Research in Chinese Universities 1997年第3期13卷 229+33623+232-234页

作者： YANG Min-li , feng man-Iang , LU Jiu-ru (Department of Chemistry, Shaanxi Normal University, Xian, 710062) SHAANXI NORMAL UNIV DEPT CHEMXIAN 710062PEOPLES R CHINA

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关键词： Chemiluminescence Brucine Toxicological analysis