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Particle motion simulation and pulverized coal injection combustion simulation of titanomagnetite pellets in rotary kiln for reduction process with coal

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Journal of Iron and Steel Research International 2022年第6期29卷 891-906页

作者： Peng liu Bing-guo liu li-bo zhang Jin-hui Peng State Key Laboratory of Complex Nonferrous Metal Resources Clean Utilization Kunming University of Science and TechnologyKunming 650093YunnanChina Yunnan Provincial Key Laboratory of Intensification Metallurgy Kunming 650093YunnanChina National Local Joint Laboratory of Engineering Application of Microwave Energy and Equipment Technology Kunming 650093YunnanChina Faculty of Metallurgical and Energy Engineering Kunming University of Science and TechnologyKunming 650093YunnanChina

The production process of direct reduced iron from titanomagnetite by coal reduction in air in rotary kiln is a key step in the extraction of titanium and *** process is conducive to alleviating the stocking problem of a large amount of Tibearing blast furnace *** relationships between particle movement and pulverized coal injection combustion in rotary kiln were studied by the particle motion simulation and the pulverized coal injection combustion *** particle motion simulation,the repose angle of ore particles was calculated to be 28.06°,and the reaction zone was roughly determined by the reaction temperature isothermal surface and the repose angle;the axial discrete distribution of ore particles would further cause the axial energy fluctuation due to the endothermic nature of the *** pulverized coal injection combustion simulation,the rebound effect of coal injection under gravity would cause local overheating in the rebound region due to the benefits of heat and mass transfer processes,while this could strengthen the reduction reaction of ore particles and cause agglomerate by *** suggestions on weakening the energy fluctuation and agglomerate were proposed based on the characteristics of particle motion and external carbon reaction.

关键词： Titanomagnetite Rotary kiln Reaction zone Energy fluctuation Rebound effect

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Hydrogen Peroxide in Plants:a Versatile Molecule of the Reactive Oxygen Species Network

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Journal of Integrative Plant Biology 2008年第1期50卷 2-18页

作者： li-Juan Quan bo zhang Wei-Wei Shi Hong-Yu li MOE Key Laboratory of Arid and Grassland Ecology School of Life Sciences Lanzhou University Lanzhou 730000 China

Plants often face the challenge of severe environmental conditions, which include various biotic and abiotic stresses that exert adverse effects on plant growth and development. During evolution, plants have evolved complex regulatory mechanisms to adapt to various environmental stressors. One of the consequences of stress is an increase in the cellular concentration of reactive oxygen species （ROS）, which are subsequently converted to hydrogen peroxide （H2O2）. Even under normal conditions, higher plants produce ROS during metabolic processes. Excess concentrations of ROS result in oxidative damage to or the apoptotic death of cells. Development of an antioxidant defense system in plants protects them against oxidative stress damage. These ROS and, more particularly, H2O2, play versatile roles in normal plant physiological processes and in resistance to stresses. Recently, H2O2 has been regarded as a signaling molecule and regulator of the expression of some genes in cells. This review describes various aspects of H2O2 function, generation and scavenging, gene regulation and cross-links with other physiological molecules during plant growth, development and resistance responses.

关键词： antioxidant system gene regulation hydrogen peroxide (H2O2) reactive oxygen species (ROS) signaling molecule.

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Rollback reconstruction for TDC enhanced perfusion imaging

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Nuclear Science and Techniques 2021年第8期32卷 23-33页

作者： Jia-Shun liu Yi-Kun zhang Hui Tang li-bo zhang Ben-Qiang Yang Ying Yan li-Min Luo Yang Chen Laboratory of Image Science and Technology Southeast UniversityNanjing 210096China Department of Radiology General Hospital of the Northern Theater of the Chinese People’s Liberation ArmyShenyang 110016China Department of Radiotherapy General Hospital of the Northern Theater of the Chinese People’s Liberation ArmyShenyang 110016China Centre de Recherche en Information Biomedicale SinoFrancais(liA CRIBs) 35000 RennesFrance

Tomographic perfusion imaging is a significant imaging modality for stroke ***,the low rotational speed of the C-arm(6–8 s per circle)is a challenge for applying perfusion imaging in C-arm cone beam computed tomography(CBCT).Traditional reconstruction methods cannot remove the artifacts caused by the slow rotational speed or acquire enough sample points to restore the time density curve(TDC).This paper presents a dynamic rollback reconstruction method for *** proposed method can improve the temporal resolution by increasing the sample points used for calculating the *** with existing techniques,the algorithm allows slow-rotating scanners to be used for perfusion imaging *** the experiments,the proposed method was compared with other dynamic reconstruction algorithms based on standard reconstruction and the temporal interpolation *** presented algorithm could improve the temporal resolution without increasing the X-ray exposure time or contrast agent.

关键词： Rollback reconstruction CBCT Time resolution Time density curve

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Image Field Deformation of LAMOST due to Differential Atmospheric Refraction

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Chinese Journal of Astronomy and Astrophysics 2006年第4期6卷 495-502页

作者： Jin-ling li bo zhang Yong Yu Zhao-Xiang Qi Ming Zhao Shanghai Astronomical Observatory Chinese Academy of Sciences Shanghai 200030

A vectorial expression of the image field deformation of LAMOST due to the differential atmospheric refraction is presented. The calculated results are compared with those from previous analyses based on the traditional spherical trigonometric formulas. It is demonstrated that different tangential displacements of star images during the observation tracking given by various authors are simply due to different reference points adopted. It is pointed out that the observational celestial pole is the center of the apparent diurnal motion, that, by referring to the observational celestial pole, the effect of the differential refraction on the image field of LAMOST during the 1.5-hour tracking period is approximately equivalent to a constant rotation of - 13.65″ for all declination belts. It is therefore unnecessary to design a particular tracking velocity for each observation, and this will be obviously advantageous to the observation implementation. If the maximum tracking error of the fibers is 0.2″, then the fibers are required to be able to re-position during observational tracking for sky regions south of declination ＋20° and north of declination ＋60°.

关键词： telescopes -- atmospheric effects -- methods: analytical-- methods: statistical-- astrometry

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Determination of dielectric properties of titanium carbide fabricated by microwave synthesis with Ti-bearing blast furnace slag

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International Journal of Minerals,Metallurgy and Materials 2021年第1期28卷 88-97页

作者： Peng liu li-bo zhang Bing-guo liu Guang-jun He Jin-hui Peng Meng-yang Huang State Key Laboratory of Complex Nonferrous Metal Resources Clean Utilization Kunming University of Science and TechnologyKunming 650093China Yunnan Provincial Key Laboratory of Intensification Metallurgy Kunming 650093China National Local Joint Laboratory of Engineering Application of Microwave Energy and Equipment Technology Kunming 650093China Faculty of Metallurgical and Energy Engineering Kunming University of Science and TechnologyKunming 650093China Faculty of Science Kunming University of Science and TechnologyKunming 650500China Yunnan Energy Research Institute Co. Ltd.Kunming 650093China

The preparation of functional material titanium carbide by the carbothermal reduction of Ti-bearing blast furnace slag with microwave heating is an effective method for valuable metals recovery;it can alleviate the environmental pressure caused by slag *** dynamic dielectric parameters of Ti-bearing blast furnace slag/pulverized coal mixture under high-temperature heating are measured by the cylindrical resonant cavity perturbation *** the transient dipole and large π bond delocalization polarization phenomena, the interaction mechanism of the microwave macroscopic non-thermal effect on the titanium carbide synthesis reaction was *** material thickness range during microwave heating was optimized by the joint analysis of penetration depth and reflection loss, which is of great significance to the design of the microwave reactor for the carbothermal reduction of Ti-bearing blast furnace slag.

关键词： titanium-bearing blast furnace slag dielectric mechanism penetration depth reflection loss microwave heating efficiency

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Kinetic study on microwave-enhanced direct reduction of titanomagnetite concentrate with coal

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Journal of Iron and Steel Research International 2023年第3期30卷 429-445页

作者： Peng liu Si-yu Gong Yu-wen Chao Bing-guo liu li-bo zhang En-hui Wu State Key Laboratory of Complex Nonferrous Metal Resources Clean Utilization Kunming University of Science and TechnologyKunming 650093YunnanChina Yunnan Provincial Key Laboratory of Intensification Metallurgy Kunming 650093YunnanChina National Local Joint Laboratory of Engineering Application of Microwave Energy and Equipment Technology Kunming 650093YunnanChina Faculty of Metallurgical and Energy Engineering Kunming University of Science and TechnologyKunming 650093YunnanChina Key Laboratory of Unconventional Metallurgy Kunming University of Science and TechnologyKunming 650093YunnanChina Panzhihua University Panzhihua 617000SichuanChina

Titanomagnetite concentrate is one of the important titanium *** apparent activation energy(Ea)of the direct reduction of titanomagnetite concentrate was composed of two parts(average activation energy:E_(a)=E_(a-L)+E_(a-Step1),where E_(a-L) is the lattice energy of titanomagnetite concentrate,and is the activation energy of step 1 for the reduction of titanomagnetite concentrate in the route ***^(3+)→^(Step1)Fe^(2+)→^(Step2)Fe_(2)O^(2)→^(Step3)Fe^(0)).Ea(583.43 kJ/mol),(426.4 kJ/mol),and(157.0 kJ/mol)were calculated by the model-free methods based on thermogravimetry and Dmol3 *** with the analysis of activation energy fluctuation and the shifting trend of related mechanism functions,the reduction kinetic system with three main characteristics,namely nucleation,diffusion and concentration fluctuation,was *** addition,the scanning electron microscopy comparison analysis of the samples from microwave reduction and conventional reduction shows that microwave heating could realize the microstructure Ti-Fe separation and reduce the lattice energy of the titanomagnetite concentrate,thus enhancing the reduction process by 7.68%from the perspective of activation energy.

关键词： Titanomagnetite Kinetics Lattice energy Reduction Microwave Titanium

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Phase-sensitive Landau-Zener-Stückelberg interference in superconducting quantum circuit

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Chinese Physics B 2021年第2期30卷 79-85页

作者： Zhi-Xuan Yang Yi-Meng zhang Yu-Xuan Zhou li-bo zhang Fei Yan Song liu Yuan Xu Jian li Shenzhen Institute for Quantum Science and Engineering Southern University of Science and TechnologyShenzhen 518055China Guangdong Provincial Key Laboratory of Quantum Science and Engineering Southern University of Science and TechnologyShenzhen 518055China Shenzhen Key Laboratory of Quantum Science and Engineering Southern University of Science and TechnologyShenzhen 518055China Department of Physics Southern University of Science and TechnologyShenzhen 518055China

Superconducting circuit quantum electrodynamics(QED)architecture composed of superconducting qubit and resonator is a powerful platform for exploring quantum physics and quantum information *** employing techniques developed for superconducting quantum computing,we experimentally investigate phase-sensitive Landau-Zener-Stückelberg(LZS)interference phenomena in a circuit *** experiments cover an extensive range of LZS transition parameters and demonstrate the LZS induced Rabi-like oscillation as well as phase-dependent steady-state population.

关键词： superconducting qubit circuit QED Landau-Zener-Stückelberg interference

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Inhibition of M-MuLV reverse transcriptase activity by fullerene derivatives

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Chinese Science Bulletin 2006年第20期51卷 2550-2552页

作者： MENG Xianmei CHEN Zhe li bo zhang Yufei ZHAO Dongxu YANG Xinlin School of life Science and Technology Beijing Institute of TechnologyBeijing 100081 China

Influence of fullerene (C60) derivatives on M-MuLV reverse transcriptase activity is investi- gated. Two water-soluble fullerene derivatives, fullerol (C60(OH)23-24) and trimalonic acid C60 (TMA C60, C63(COOH)6) are used in the experiments and their effects on in vitro reverse transcription-polymerase chain reaction (RT-PCR) of β-actin mRNA in HeLa cells are determined. PCR products are detected by agarose gel electrophoresis. It is found that the amounts of PCR products decrease with addition of either of two fullerene derivatives to RT reaction mixture. The inhibition of fullerene derivatives is dose-dependent, and IC50 values of fullerol and TMA C60 are 0.089 and 0.039 mmol/L, respectively. The amount of PCR products obtained by direct addition of fullerol or TMA C60 to PCR are greater than those obtained by addition of the equivalent amount of fullerol or TMA C60 to RT, indicating an inhibitory ef- fect of fullerol or TMA C60 on RT. The compensative experiment of M-MuLV reverse transcriptase shows that increasing enzyme amounts can antagonize the activity of fullerol or TMA C60. These results imply that fullerenes can inhibit M-MuLV reverse transcriptase activity, with the inhibition of TMA C60 slightly stronger than fullerol, and that their potential in treatment of diseases induced by RNA viruses such as leukemia virus needs further investigation.

关键词： M-MuLV 反转录酶抑制作用水溶性丙二酸

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Successful recovery of COVID-19-associated recurrent diarrhea and gastrointestinal hemorrhage using convalescent plasma

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Military Medical Research 2021年第1期8卷 132-137页

作者： li-bo zhang Rong-Rong Pang Qing-Hua Qiao Zhi-Hua Wang Xin-Yi Xia Chang-Jun Wang Xiao-li Xu COVID-19 Research Center Institute of Laboratory MedicineJinling HospitalNanjing University School of Medicinethe First School of Clinical MedicineSouthern Medical UniversityNanjing 210002JiangsuChina Department of Laboratory Medicine Nanjing Red Cross Blood CenterNanjing 210003JiangsuChina Medical and Technical Support Department Pingdingshan Medical Districtthe 989th HospitalPingdingshan 467000HenanChina Department of Laboratory Medicine&Blood Transfusion Wuhan Huoshenshan HospitalWuhan 430100HubeiChina Department of Laboratory Medicine&Blood Transfusion the 907th HospitalNanping 350702FujianChina Joint Expert Group for COVID-19 Wuhan Huoshenshan HospitalWuhan 430100HubeiChina Center for Disease Control and Prevention of PLA No.20 Dongda StreetFengtai DistrictBeijing 100071China Department of Medical Administration Jinling HospitalNanjing University School of MedicineNo.305 East Zhongshan RoadNanjing 210002JiangsuChina

Background: Gastrointestinal symptoms are not rare among coronavirus disease 2019(COVID-19) patients, but there have been no reports regarding convalescent plasma therapy for the recovery of gastrointestinal problems in COVID-19 *** presentation: We present two cases of patients with COVID-19-associated recurrent diarrhea and positive fecal occult blood who successfully recovered after a one-time convalescent plasma ***: When COVID-19 patients develop recurrent or refractory gastrointestinal symptoms and fail to respond to the available treatment, alternative therapy with convalescent plasma administration may be considered.

关键词： Coronavirus disease 2019(COVID-19) Convalescent plasma SARS-Co V-2 virus Gastrointestinal symptoms

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The role and advantage of traditional Chinese medicine in the prevention and treatment of COVID-19

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Journal of Integrative Medicine 2023年第5期21卷 407-412页

作者： Ming Huang Yao-yuan liu Ke Xiong Feng-wen Yang Xin-yao Jin Zhao-qi Wang Jun-hua zhang bo-li zhang State Key Laboratory of Component-based Chinese Medicine Tianjin University of Traditional Chinese MedicineTianjin 301617China Department of Cardiology the First Teaching Hospital of Tianjin University of Traditional Chinese MedicineNational Clinical Research Center for Chinese Medicine Acupuncture and MoxibustionTianjin 300193China State Drug Administration Key Laboratory of Evidence-based Evaluation of Traditional Chinese Medicine Tianjin University of Traditional Chinese MedicineTianjin 301600China

The global coronavirus disease 2019(COVID-19)pandemic has had a massive impact on global social and economic development and human *** combining traditional Chinese medicine(TCM)with modern medicine,the Chinese government has protected public health by supporting all phases of COVID-19 prevention and treatment,including community prevention,clinical treatment,control of disease progression,and promotion of *** medicine focuses on viruses,while TCM focuses on differential diagnosis of patterns associated with viral infection of the body and recommends the use of TCM decoctions for differential *** differential diagnosis and treatment approach,with its profoundly empirical nature and holistic view,endows TCM with an accessibility advantage and high application value for dealing with ***,we summarize the advantage of and evidence for TCM use in COVID-19 prevention and treatment to draw attention to the scientific value and accessibility advantage of TCM and to promote the use of TCM in response to public health emergencies.

关键词： COVID-19 Traditional Chinese medicine Prevention and control Therapeutics

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