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Carbonation Behavior Assessment of RH Slag Batch after Aqueous Extraction at Environmental Pressure

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Journal of Iron and Steel Research International 2014年第S1期21卷 74-81页

作者： An-jun xu Hui-ning ZHANG Dong-feng HE State Key Laboratory of Advanced Metallurgy University of Science and Technology Beijing School of Metallurgical and Ecological Engineering University of Science and Technology Beijing School of Metallurgy and Chemical Engineering Jiangxi University of Science and Technology

In order to assess CO2 sequestration amount and carbonation degree for RH slag at surrounding pressure, carbonation process of RH slag batch in lab is investigated, and the parameters of carbonation degree and CO2 sequestration amount are the targets, and the relationship between both and relevant factors, such as CO2 flow, gas bubble size etc. is originally discussed. The carbonation degree increases when temperature increases before 60 oC, then decreases. Particle size has a positive effect on carbonation degree, and carbonation degree for 0.5 L/min is bigger than those for 0.1 L/min and 1.0 L/min. When small gas bubble generator is adopted, carbonation degree and CO2 sequestration amount is improved. The maximum carbonation degree and CO2 sequestration amount is 34% and 178.65 g/kgslag, respectively when 38 μm RH slag batch is carbonated for 90 min at 60 oC under the conditions that CO2 flow is 0.5 L/min and bubble size equals 5 mm. CaCO3 and MgCO3 phases exists through XRD analysis, showing that carbonation process is effective. Carbonation degree model is established assuming carbonation reaction occurs on the active surface of RH slag batch. This model fits very well by comparison between experimental results and model results.

关键词： RH slag carbonation degree CO2 bubble size CO2 sequestration amount

Analysis of Laser Diode Pumped Solid-State Laser Resonator by the Transform Circle Approach

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Chinese Physics Letters 2000年第3期17卷 203-205页

作者： SONG feng ZHANG Guang-Yin xu jing-jun ZHANG Chao-Bo Photonics Center Nankai UniversityTianjin 300071

The typical laser characteristics of a laser diode pumped,solid-state laser with a Z-type resonator structure are analyzed by the transform circle *** waists change with the thennal focus length of the lasing medium so that the output power becomes *** particular,there is a very unstable operation region when the pump power is of medium magnitude.A method is put forward to avoid this situation.

关键词： pumped pump resonator

CX3 chemokine receptor 1 deficiency leads to reduced dendritic complexity and delayed maturation of newborn neurons in the adult mouse hippocampus

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Neural Regeneration Research 2015年第5期10卷 772-777页

作者： feng Xiao jun-mei xu Xing-hua Jiang Department of Anesthesiology the Second Xiangya Hospital of Central South University

Previous studies have shown that microglia impact the proliferation and differentiation of neu- rons during hippocampal neurogenesis via the fractalkine/CX3 chemokine receptor i （CX3CRI） signaling pathway. However, whether microglia can influence the maturation and dendritic growth of newborn neurons during hippocampal neurogenesis remains unclear. In the present study, we found that the number of doublecortin-positive cells in the hippocampus was decreased, and the dendritic length and number of intersections in newborn neurons in the hippocampus were reduced in transgenic adult mice with CX3CR1 deficiency （CX3CRl^GFP/GFe）. Furthermore, after experimental seizures were induced with kainic acid in these CX3CRl-deficient mice, the expression of c-fos, a marker of neuronal activity, was reduced compared with wild-type mice. Collectively, the experimental findings indicate that the functional maturation of newborn neu- rons during hippocampal neurogenesis in adult mice is delayed by CX3CR1 deficiency.

关键词： nerve regeneration fractalkine CX3 chemokine receptor 1 neuronal maturation dendrites doublecortin synaptic maturation newborn neurons neural regeneration

Energy harvester array using piezoelectric circular diaphragm for rail vibration

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Acta Mechanica Sinica 2014年第6期30卷 884-888页

作者： Wei Wang Rong-Jin huang Chuan-jun huang Lai-feng Li State Key Laboratory of Technologies in Space Cryogenic Propellants Technical Institute of Physics and ChemistryChinese Academy of Sciences

Generating electric energy from mechanical vibration using a piezoelectric circular membrane array is presented in this *** electrical characteristics of the functional array consisted of three plates with varies tip masses are examined under dynamic *** an optimal load resistor of 11 k,an output power of 21.4 m W was generated from the array in parallel connection at 150 Hz under a pre-stress of 0.8 N and a vibration acceleration of9.8 m/***,the broadband energy harvesting using this array still can be realized with different tip *** obvious output power peaks can be obtained in a frequency spectra of 110 Hz to 260 *** results show that using a piezoelectric circular diaphragm array can increase significantly the output of energy compared with the use of a single *** by optimizing combination of tip masses with piezoelectric elements in array,the frequency range can be tuned to meet the broadband *** array may possibly be exploited to design the energy harvesting for practical applications such as future high speed rail.

关键词： Energy harvesting Array Piezoelectric material Rail vibration

Theoretical Calculations and Experimental Verification for the Pumping Effect Caused by the Dynamic Micro-tapered Angle

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Chinese Journal of Mechanical Engineering 2016年第3期29卷 615-623页

作者： CAI Yufei ZHANG Jianhui ZHU Chunling huang jun JIANG feng College of Aerospace Engineering Nanjing University of Aeronautics and Astronautics School of Electro-Mechanical Engineering Guangzhou University State Key Laboratory of Mechanics and Control of Mechanical Structures Nanjing University of Aeronautics and Astronautics Research Center of Fluid Machinery Engineering and Technology Jiangsu University

The atomizer with micro cone apertures has advantages of ultra-fine atomized droplets, low power consumption and low temperature rise. The current research of this kind of atomizer mainly focuses on the performance and its application while there is less research of the principle of the atomization. Under the analysis of the dispenser and its micro-tapered aperture＇s deformation, the volume changes during the deformation and vibration of the micro-tapered aperture on the dispenser are calculated by coordinate transformation. Based on the characters of the flow resistance in a cone aperture, it is found that the dynamic cone angle results from periodical changes of the volume of the micro-tapered aperture of the atomizer and this change drives one-way flows. Besides, an experimental atomization platform is established to measure the atomization rates with different resonance frequencies of the cone aperture atomizer. The atomization performances of cone aperture and straight aperture atomizers are also measured. The experimental results show the existence of the pumping effect of the dynamic tapered angle. This effect is usually observed in industries that require low dispersion and micro- and nanoscale grain sizes, such as during production of high-pressure nozzles and inhalation therapy. Strategies to minimize the pumping effect of the dynamic cone angle or improve future designs are important concerns. This research proposes that dynamic micro-tapered angle is an important cause of atomization of the atomizer with micro cone apertures.

关键词： atomization nozzle/diffuser flow dynamic cone angle piezoelectric pump

Ring-Shaped Jets in Gamma-Ray Bursts

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Chinese Journal of Astronomy and Astrophysics 2008年第4期8卷 411-420页

作者： Ming xu Yong-feng huang Si-Wei Kong Department of Astronomy Nanjing University Nanjing 210093 China

When the axis of a gamma-ray burst （GRB） does not coincide with the spin axis of its source, there may result a ring-shaped jet. Using some refined jet dynamics, we calculate multi-wavelength afterglow light curves for such ring-shaped jets. In the R-band we find an obvious break in the afterglow light curve due to the beaming effect and the break is affected by many parameters, such as the electron energy fraction ζe, the magnetic energy fraction ζB^2, the width of ring △θ and the medium number density n. The overall light curve can be divided into three power-law stages, i.e., an ultra-relativistic stage, an after-break stage and a deep Newtonian stage. For each stage the power-law index is larger in the ring-shaped jet than in the corresponding conical jet.

关键词： gamma rays bursts - ISM jets and outflows

Microstructure and mechanical properties of Ti-6Al-4V components fabricated by laser micro cladding deposition

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Rare Metals 2015年第7期34卷 445-451页

作者： Bo Yao xu-Long Ma feng Lin Wen-jun Ge Key Laboratory for Advanced Materials Processing Technology Ministry of Education of China Key Laboratory for Biomanufacturing and Rapid Forming Technology Department of Mechanical Engineering Tsinghua University Department of Mechanical Engineering Army Aviation Institute of Chinese People’s Liberation Army

Laser micro cladding deposition manufacturing(Ll CDM) is a newly developed rapid manufacturing method for *** Ll CDM technology adopts a novel powder feeding method based on alternating friction and inertia force, and this powder feeding method can effectively improve the accuracy and orientation of the powder injection, resulting in a smaller molten pool size and a higher cooling rate of liquid ***, the components fabricated by Ll CDM could obtain the finer microstructures and the improved mechanical *** is found that the components fabricated by Ll CDM are fully dense free of cracks or pores and exhibit columnar prior b grains with a finer acicular a0 phase *** microhardness(HV0.2) of the thin-wall component is HV 400–HV 500 in the majority part of the cross section and can reach about HV 850 in the top *** ultimate tensile strength(UTS) and elongation show insignificant dependence on the testing directions of the *** UTS is between 1,002 and 1,100 MPa, and the elongation is between 10.0 % and 14.7 %.

关键词： Laser micro cladding deposition Ti-6Al-4V Microstr

Oral Chinese Herbal Medicine for Heart Failure with Preserved Ejection Fraction: A Meta-Analysis

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Chinese Journal of Integrative Medicine 2019年第10期25卷 770-777页

作者： MEI jun xu Hao xu feng-qin JU Jian-qing Graduate School Beijing University of Chinese Medicine Beijing (100029) China Cardiovascular Diseases Center Xiyuan Hospital China Academy of Chinese Medical Sciences Beijing (100091) China Geriatric Institution Xiyuan Hospital China Academy of Chinese Medical Sciences Beijing (100091) China

Objective: To evaluate the effectiveness and safety of oral Chinese herbal medicine(OCHM) for heart failure with preserved ejection fraction(HFp EF). Methods: Pub Med, Excerpta Medica Database(EMBASE), Cochrane Library, Chinese Biological Medicine Database(CBM), Wanfang Database, Chongqing VIP Information(VIP) and China National Knowledge Infrastructure(CNKI) were searched for appropriate articles from respective inceptions until june 3, 2018. Randomized controlled trials(RCTs) investigating the effectiveness of OCHM for the patients with HFp EF were eligible. Quality assessment was performed by employing the Cochrane Risk of Bias assessment tool. Papers were independently reviewed by two reviewers and analyzed using Cochrane software Revman 5.3. Dichotomous data were analyzed by relative risk(RR) with a 95% confidence interval(CI), while continuous variables were analyzed by using mean difference(MD) with 95% CI for effect size. Results: A total of 16 RCTs involving 1,320 participants were identified. Fourteen of the trials used conventional Western medicine(CWM) as the control, the control of 1 trial was no treatment, and another was placebo. Three of the trials served Chinese patent medicine(CPM) as interventions, and other OCHM were Chinese medicine decoctions(CMDs). Only limited evidence showed experimental group with OCHM may get better effect on brain natriuretic peptide(BNP: MD –37.29, 95% CI –53.08 to –21.50, P<0.00001) or N terminal pro B type natriuretic peptide(NT-pro BNP: MD –236.04, 95% CI –356.83 to –115.25, P=0.0001), Minnesota Living with Heart Failure questionnaire(MLHFQ, MD –9.94, 95% CI –16.77 to –3.11, P=0.004), but the results had high heterogeneities. With concerns on 12 of 16 trials, the meta-analysis found that the adjuvant therapy of OCHM might be more effective in increasing overall response rate(RR 1.17, 95% CI 1.11 to 1.24, P<0.00001), when compared with CWM alone. Subgroup meta-analysis between CPMs and CMDs showed that the two CPMs may

关键词： oral Chinese herbal medicine heart failure with preserved ejection fraction meta-analysis systematic review

Amino-functionalized magnetic bacterial cellulose/activated carbon composite for Pb^2＋ and methyl orange sorption from aqueous solution

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Journal of Materials Science & Technology 2018年第5期34卷 855-863页

作者： Xiaogui huang Xiaozhang Zhan Cuilian Wen feng xu Lijin Luo College of Materials Science and Engineering Fuzhou University Fuzhou 350116 China Key Laboratory of eco-Materials Advanced Technology (Fuzhou University) Fujian Province University Fuzhou 350116 China Fujian Provincial Key Laboratory of Screening for Novel Microbial Products Fujian Institute of Microbiology Fuzhou 350007 China

A new nanostructured amino-functionalized magnetic bacterial cellulose/activated carbon（BC/AC）composite bioadsorbent（AMBCAC）was prepared for removal of Pb^2＋ and methyl orange（MO）from aqueous *** results demonstrated that the equilibrium adsorption capacity（qe）for Pb^2＋ obviously increases by 2.14 times after introduction of amino groups,the optimum p H for Pb^2＋and MO adsorption was 5.0 and 3.0,respectively,and the qeof AMBCAC was 161.78 mg g^-1 for Pb^2＋ and 83.26 mg g^-1 for MO under the optimal conditions in this *** kinetics and adsorption isotherm data of the sorption process were well fitted by pseudo-second-order kinetic model and Langmuir isotherm *** thermodynamic results（the Gibbs free energy change G〈0,the enthalpy change H〉0,the entropy change S〉0）implied that the adsorption process of Pb^2＋ and MO was feasible,endothermic and spontaneous in *** results support that the AMBCAC composite developed in this work can provide a cheap and efficient way for easy removal of both Pb^2＋ and MO as a promising adsorbent candidate for wastewater treatment.

关键词： Bacterial cellulose Activated carbon Pb^2+ Methyl orange Adsorption