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Effect of screw casing structure on descending of burdens in COREX shaft furnace

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Journal of Iron and Steel Research International 2017年第1期24卷 18-26页

作者： Zi-long Qiu zhi-guo luo Heng Zhou Ren Chen Feng Wang Zong-shu Zou College of Metallurgy Northeastern University College of Metallurgy Engineering Liaoning Institute of Science and Technology

COREX shaft furnace（SF）is a typical screw feeder with a storage container coupled with eight screw casings and *** structure of screw casing plays an important role in the moving behavior of burdens,stress distribution,abrasive wear of screws,and energy consumption during the operation of ***,a three-dimensional semi-cylindrical model of actual size of COREX-3000 SF was established based on discrete element method to investigate the influences of screw casing *** results show that the increase in the gap between the outside of screw flight and screw casing is beneficial for the smooth operation of SF,resulting in uniform descending velocity along the radius of SF in the lower part,decreasing the size of recirculation region,and alleviating stress concentration in the screw ***,raising the gap appropriately is also beneficial to weaken screw abrasive wear,decrease energy consumption,and then prolong the service life of the ***,enlarging the gap also leads to more undesired high temperature reduction gas into the SF from melter gasifier,thereby deteriorating the operation of ***,an ideal distance exists between the outside of the screw flight and the screw casing,which is suggested to be equal to the average of particle diameter.

关键词： COREX shaft furnace Screw casing structure Discrete element method Recirculation structure Screw abrasive wear

A ultrasensitive nonenzymatic glucose sensor based on Cu_2O polyhedrons modified Cu electrode

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Chinese Chemical Letters 2012年第8期23卷 953-956页

作者： zhi Jun luo Ting Ting Han Ling Ling Qu Xiang Yang Wu School of The Environment Jiangsu UniversityZhenjiang 212013China School of Chemistry and Chemical Engineering Jiangsu UniversityZhenjiang 212013China

A novel nonenzymatic glucose sensor was successfully fabricated based on the Cu2O polyhedrons covered Cu foil. The Cu2O polyhedrons covered Cu foil was constructed via a facile, low-cost and larger scale producible method. The Cu2O polyhedrons covered Cu foil can be directly used as the working electrode of nonenzymatic glucose sensor, which present good stability and flexibility. The results indicated that the Cu2O polyhedrons modified Cu electrode （Cu2O/Cu electrode） showed high electrocatalytic activity for the oxidation of glucose in alkaline solution. There are two linear regions of glucose concentration for the glucose sensor based on Cu2O/Cu electrode, respectively in 10μmol/L to 0.53 mmol/L （sensitivity： 3029.33 μA （mmol/ L）^-1 cm^-2） and in 0.53-7.53 mmol/L （sensitivity： 728.67 μA （rnmol/L）^-1 cm^-2）.

关键词： Cuprous oxide film Nonenzymatic sensor Glucose Electrocatalytic oxidation

Magnetite/N-doped carboxylate-rich carbon spheres:Synthesis,characterization and visible-light-induced photocatalytic properties

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Chinese Chemical Letters 2013年第1期24卷 63-66页

作者： Hong-Jun Tang Ting-Ting Han zhi-Jun luo Xiang-Yang Wu School of Chemistry and Chemical Engineering Jiangsu University School of the Environment Jiangsu University State Key Laboratory of Coordination Chemistry Nanjing University

A novel magnetically separable visible-light-photocatalyst, magnetite/N-doped carboxylate-rich carbon spheres （N-MCRCSs）, was synthesized by a facile ultrasonic method using the magnetite/carboxylate- rich carbon spheres （MCRCSs） as precursors. N element has been successfully doped into the MCRCSs in a HN03 aqueous solution via an ultrasonic treatment, which were demonstrated by the FT-IR and XPS. N- MCRCSs exhibit more intensive absorption over MCRCSs in the entire UV and visible region. N-MCRCSs can not only be easily recycled by applying an external magnetic field, but also exhibit powerful visible light photocatalytic activity.

关键词： Visible-light-photocatalystFerricarboxylate complexesMagnetiteN-doped carbon

V551 Aur,an oEA binary with g-mode pulsations?

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Research in Astronomy and Astrophysics 2012年第6期12卷 671-677页

作者： Nian Liu Xiao-Bin Zhang An-Bin Ren Li-Cai Deng zhi-Quan luo Institute of Theoretical Physics China West Normal University Nanchong 637002 China National Astronomical Observatories Chinese Academy of Sciences Beijing 100012 China

We present time-series CCD photometry of V551 Aur, an eclipsing binary located in the open cluster NGC 2126 that shows δ Scuti-like pulsations. Complete covered light curves in theBand V bands were obtained with high-precision over nine nights. Based on them, a revised orbital period and the first photometric solutions were determined. Our eclipsing light-curve synthesis reveals a detached configura- tion for the binary system with a mass-ratio of about 0.73, and the mean density of the pulsating primary component was deduced to be about （0.532±0.005）ρ. A fre- quency analysis of the eclipse-subtracted light curve yields two reliable frequencies at f1=7.727013（c/d） and f2=15.45403（c/d）, respectively. With the help of the derived mean density, mode identification was performed. The result suggests that the primary component of V551 Aur is very probably g-mode oscillations.

关键词： stars: binaries: eclipsing -- stars: oscillations -- stars: individual (V551Aur) -- open cluster: individual (NGC 2126)

Effect of Superstrong Magnetic Fields on Nuclear Energy Generation Rate in the Crust of Neutron Stars

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Communications in Theoretical Physics 2008年第4期49卷 1069-1072页

作者： LIU Hong-Lin luo zhi-Quan LIU Jing-Jing LAI Xiang-Jun Institute of Theoretical Physics China West Normal University Nanchong 637002 China

This paper shows that superstrong magnetic fields （such as those of magnetars） can increase the energy generation rate many times in the crust of neutron stars. This result undoubtedly not only influences the coolin... 详细信息

关键词： superstrong magnetic fields energy generation rate neutron stars

The role of radical prostatectomy and definitive external beam radiotherapy in combined treatment for high-risk prostate cancer:a systematic review and meta-analysis

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Asian Journal of Andrology 2020年第4期22卷 383-389页

作者： Xu Cheng zhi-Hui Wang Mou Peng zhi-Chao Huang Lu Yi Yi-Jian Li Lei Yi Wen-zhi luo Jia-Wen Chen Yin-Huai Wang Department of Urology The Second Xiangya Hospital of Central South UniversityChangsha 410011China T.H.Chan School of Public Health Harvard UniversityBostonMA 02115USA

The first-line treatment options for high-risk prostate cancer(PCa)are definitive external beam radiotherapy(EBRT)with or without androgen deprivation therapy(ADT)and radical prostatectomy(RP)with or without adjuvant ***,few randomized trials have compared the survival outcomes of these two *** systematically evaluate the survival outcomes of high-risk PCa patients treated with EBRT-or RP-based therapy,a comprehensive and up-to-date meta-analysis was performed.A systematic online search was conducted for randomized or observational studies that investigated biochemical relapse-free survival(bRFS),cancer-specific survival(CSS),and/or overall survival(OS),in relation to the use of RP or EBRT in patients with high-risk *** summary hazard ratios(HRs)were estimated under the random effects *** identified heterogeneity between studies using Q tests and measured it using I2 *** evaluated publication bias using funnel plots and Egger's regression asymmetry *** studies(including one randomized controlled trial[RCT])of low risk of bias were selected and up to 9504 patients were *** comparing EBRT-based treatment with RP-based treatment,the pooled HRs for bRFS,CSS,and OS were 0.40(95%confidence interval[CI]:0.24–0.67),1.36(95%CI:0.94–1.97),and 1.39(95%CI:1.18–1.62),*** OS for RP-based treatment and better bRFS for EBRT-based treatment have been identified,and there was no significant difference in CSS between the two ***-based treatment is recommended for high-risk PCa patients who value long-term survival,and EBRT-based treatment might be a promising alternative for elderly patients.

关键词： high risk prostatectomy prostatic neoplasms radiotherapy survival

Usefulness of prenatal magnetic resonance imaging in differential diagnosis of fetal congenital cystic adenomatoid malformation and bronchopulmonary sequestration

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World Journal of Clinical Cases 2021年第4期9卷 822-829页

作者： zhi Li Yi-Dan Lv Rong Fang Xu Li zhi-Qin luo Ling-Hong Xie Ling Zhu Department of Radiology Huzhou Maternity&Child Health Care HospitalHuzhou 313000Zhejiang ProvinceChina Department of Endocrinology Huzhou Central HospitalAffiliated Central Hospital of Huzhou UniversityHuzhou 313000Zhejiang ProvinceChina Prenatal Diagnosis Center Huzhou Maternity&Child Health Care HospitalHuzhou 313000Zhejiang ProvinceChina Center of Imaging Diagnosis Anhui Provincial Children’s HospitalHefei 230000Anhui ProvinceChina Department of Ultrasound Huzhou Maternity&Child Health Care HospitalHuzhou 313000Zhejiang ProvinceChina

BACKGROUND Congenital cystic adenomatoid malformation(CCAM)and bronchopulmonary sequestration(BPS)are the most common lung diseases in *** are differences in the prognosis and treatment of CCAM and BPS,and the clinical diagnosis and treatment plan is usually prepared prior to ***,it is quite necessary to make a clear diagnosis before *** and BPS have similar imaging features,and the differentiation mainly relies on the difference in supply ***,it is hard to distinguish them due to invisible supplying vessels on some *** To explore the application value of magnetic resonance imaging(MRI)in the differential diagnosis of fetal CCAM and *** Data analysis for 32 fetuses with CCAM and 14 with BPS diagnosed by prenatal MRI at Huzhou Maternal and Child Health Care Hospital and Anhui Provincial Children’s Hospital from January 2017 to January 2020 was performed to observe the source blood vessels of lesions and their *** confirmation was completed through CT examination and/or operations after *** After birth,31 cases after birth were confirmed to be CCAM,and 15 were confirmed to be *** CCAM group consisted of 21 macrocystic cases and 10 microcystic *** 18 cases,blood vessels were visible in *** supply of the pulmonary artery could be traced in eight cases,and in 10 cases,only vessels running from the midline to the lateral down direction were *** lesions were found in four macrocystic cases and one microcystic case with CCAM through CT after birth;two were misdiagnosed by MRI,and three were misdiagnosed by prenatal *** BPS group consisted of 12 intralobar cases and three extralobar *** vessels were visible in lesions of nine cases,in four of which,the systemic circulation blood supply could be traced,and in five of which,only vessels running from the midline to the lateral up direction were *** were misdiagnosed by MRI,and fou

关键词： Congenital cystic adenomatoid malformation Bronchopulmonary sequestration Magnetic resonance imaging Differential diagnosis Fetuses Congenital

基于向量式混合质点单元薄壳非线性分析方法的膜材褶皱形变模拟研究（英文）

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Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2014年第5期15卷 331-350页

作者： Yao-zhi luo Chao YANG Space Structures Research Center Zhejiang University

研究目的:建立一种适用于理想膜结构可进行高精度褶皱形变模拟的稳定可靠的数值分析技术及方法。创新要点:根据薄壳理论,在向量式混合质点单元方法(VFPEM)薄膜计算理论的基础上,引入弯曲内力分析模型并与其进行组合,发展了一种能够描述... 详细信息

研究目的:建立一种适用于理想膜结构可进行高精度褶皱形变模拟的稳定可靠的数值分析技术及方法。创新要点:根据薄壳理论,在向量式混合质点单元方法(VFPEM)薄膜计算理论的基础上,引入弯曲内力分析模型并与其进行组合,发展了一种能够描述膜材面外变形的新型非线性薄壳计算理论,同时给出了将其应用于褶皱形变模拟的关键求解技术。研究方法:1.针对薄壳计算模型中的弯曲内力,利用移动基础架构和逆向刚体运动的概念扣除刚体转动,在只含有节点独立转动自由度的单元变形坐标系下根据虚功原理和平衡条件进行计算;2.借助于薄壳非线性屈曲模拟方法,引入合理的初始扰动作为诱发理想平面膜材中形成褶皱的有效机制;3.采用拟动力显式数值积分技术求解质点运动方程,通过追踪质点平衡位置来获得稳态的褶皱构形。重要结论:采用本文模型和方法可以模拟薄膜结构在面内荷载作用下褶皱的分布模式、具体构形信息及应力状态,计算过程不存在收敛性困难,结果准确。

关键词：薄膜褶皱向量式混合质点单元法薄壳模型拟静力策略显式时间积分膜结构

Influence of Cohesive Zone Shape on Solid Flow in COREX Melter Gasifier by Discrete Element Method

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Journal of Iron and Steel Research International 2015年第4期22卷 304-310页

作者： Li-hao HAN zhi-guo luo Heng ZHOU Zong-shu ZOU Yu-zhu ZHANG School of Materials and Metallurgy Northeastern University College of Metallurgy and Energy Hebei United University

Based on the principle of discrete element method （DEM）, a 2D slot model of a COREX melter gasifier was established to analyze the influence of cohesive zone shape on solid flow, including mass distribution, velocity distribution, normal force distribution and porosity distribution at a microscopic level. The results show that the co- hesive zone shape almost does not affect the particle movement in the upper shaft and deadman shape. The particles in the lower central bottom experience large normal force to support the particles above them, while particles around the raceway and in the fast flow zone exhibit weak force network. The porosity distribution was also examined under three kinds of cohesive zones. Like the velocity distribution, the whole packed bed can be divided into four main re- gions. With the increase of cohesive zone position, the low porosity region located in the root of cohesive zone increa- ses. And the porosity distribution becomes asymmetric in the case of biased cohesive zone.

关键词： COREX melter gasifier discrete element method porosity distribution cohesive zone shape solid flow