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Immobilization of Cd and Pb in soils by polymeric hydroxyl ferric phosphate

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Transactions of Nonferrous Metals Society of China 2017年第5期27卷 1165-1171页

作者： Yi-ning YUAN Li-yuan CHAI zhi-hui yang Rui-ping WU hui LIU Li-fen LIANG Wei SHI School of Metallurgy and Environment Central South University Changsha 410083 China Chinese National Engineering Research Center for Control and Treatment of Heavy Metal Pollution Central South University Changsha 410083 China China BlueStar Changsha Design and Research Institute Changsha 410116 China

A polymeric hydroxyl ferric phosphate(PHFP)was prepared by using a byproduct of titanium dioxide containing ferrous sulfate and phosphates under alkaline *** PHFP was used to immobilize lead(Pb)and cadmium(Cd)in *** transform infrared spectra,X-ray diffraction were applied to revealing the characteristics of PHFP,and the modified Tessier sequential extraction and column leaching experiment with simulated acid rain were used to assess the effectiveness of immobilization of Cd and Pb in soils by *** results showed that PHFP was indeed a polymer with complicated OH-Fe-P structure and consisted of Fe6(OH)5(H2O)4(PO4)4(H2O)2and Fe25(PO4)14(OH)***,the removal rates of DTPA-extractable Cd and Pb in soils reached up to33%and45%,and the water-soluble Cd and Pb decreased by56%and58%,respectively,when PHFP was added in soils at4%*** addition,the immobilization of Cd and Pb contributed to transforming water soluble,exchangeable and carbonate-bonded fractions to Fe and Mn oxides-bonded,organic-bonded and residual *** leaching with simulated acid rain,Cd and Pb release amount in PHFP amended soil declined by53%and52%,respectively,as compared with non-treated *** result implied that PHFP had a potential application for the remediation of Cd-and Pb-contaminated soils.

关键词： soil Cd Pb polymeric hydroxyl ferric phosphate immobilization remediation

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敞口式离心喷嘴内部及近喷口区域的流动特性

航空动力学报 2016年第12期31卷 2988-2995页

作者：陈晨杨样高宏力晏至辉杨顺华西南交通大学机械工程学院成都610031 中国空气动力研究与发展中心吸气式高超声速技术研究中心四川绵阳621000

为了深入理解敞口式离心喷嘴雾化机制,基于界面追踪法VOF(volume of fluid)和RNG(renormalization group)湍流模型对敞口式离心喷嘴进行数值模拟,计算结果与PDPA(phase Doppler particle analyzer)及单反相机测得的喷嘴出口速度和雾化... 详细信息

为了深入理解敞口式离心喷嘴雾化机制,基于界面追踪法VOF(volume of fluid)和RNG(renormalization group)湍流模型对敞口式离心喷嘴进行数值模拟,计算结果与PDPA(phase Doppler particle analyzer)及单反相机测得的喷嘴出口速度和雾化锥角一致性较高.清晰地捕获了中心空气涡结构及喷嘴内部的回流区,展现了切向孔与旋流室的交互影响,并着重分析了液膜厚度演变特性及喷嘴内外速度场发展规律.随着喷注压降的增加,破碎长度降低,打开长度及喷雾角增加.揭示了敞口式离心喷嘴独特的流动机制,为喷嘴雾化性能预测及结构优化提供依据.

关键词： VOF模型内部流动空气涡敞口式离心喷嘴雾化

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贫燃预混燃烧室中的分布式火焰传递函数分析

推进技术 2016年第12期37卷 2210-2218页

作者：于丹郭志辉杨甫江北京航空航天大学能源与动力工程学院航空发动机气动热力国家级重点实验室北京100191

为了深入研究贫油预混燃烧室中的燃烧不稳定机理,采用实验方法测量火焰沿轴向的热释放分布,研究了不同当量比以及空气流量对自激振荡模态下的分布式火焰传递函数尤其是相位分布的影响。结果表明,火焰传递函数的相位所对应的迟滞时间主... 详细信息

为了深入研究贫油预混燃烧室中的燃烧不稳定机理,采用实验方法测量火焰沿轴向的热释放分布,研究了不同当量比以及空气流量对自激振荡模态下的分布式火焰传递函数尤其是相位分布的影响。结果表明,火焰传递函数的相位所对应的迟滞时间主要由三部分构成:扰动从燃料喷注点传播至头部所需的输运时间、靠近头部出口突扩面处涡环形成的迟滞时间、涡环输运至火焰锋面的输运时间;而其中漩涡环涡环形成所造成的相位增量是研究燃烧不稳定性的关键因素,当量比由0.6增加到0.73的过程中相位增量相应从0.5增加到1.0。自激振荡较强的两个模态中,进气段模态频率为233Hz具有锁频特性,而输运模态频率为180Hz会随着相位增量的变化而变化,由180Hz增加到207Hz。

关键词：燃烧不稳定性自激振荡模态火焰传递函数迟滞时间漩涡环

Identification of a functional 339 bp Alu insertion polymorphism in the schizophrenia-associated locus at 10q24.32

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Zoological Research 2020年第1期41卷 84-89页

作者： hi-hui yang Xin Cai Na Qu Li-Juan Zhao Bao-Liang Zhong Shu-Fang Zhang Jing Chen Bin Xia Hong-Yan Jiang Dan-yang Zhou Wei-Peng Liu Hong Chang Xiao Xiao Yi Li Ming Li Key Laboratory of Animal Models and Human Disease Mechanisms of the Chinese Academy of Sciences and Yunnan Province Kunming Institute of ZoologyChinese Academy of SciencesKunmingYunnan 650223China Kunming College of Life Science University of Chinese Academy of SciencesKunmingYunnan 650223China Affiliated Wuhan Mental Health Center Tongji Medical CollegeHuazhong University of Science and TechnologyWuhanHubei 430012China Research Center for Psychological and Health Sciences China University of GeosciencesWuhanHubei 430012China Department of Psychiatry First Affiliated Hospital of Kunming Medical UniversityKunmingYunnan 650032China Center for Excellence in Brain Science and Intelligence Technology Chinese Academy of SciencesShanghai 200031China

Genome-wide association studies(GWAS)have identified multiple single nucleotide polymorphisms(SNPs)or small indels robustly associated with schizophrenia;however,the functional risk variations remain largely *** investigated the 10q24.32 locus and discovered a 339 bp Alu insertion polymorphism(rs71389983)in complete linkage disequilibrium(LD)with the schizophrenia GWAS risk variant *** presence of the Alu insertion at rs71389983 strongly repressed transcriptional activities in in vitro luciferase *** polymorphism may be a target for future mechanistic *** study also underlines the importance and necessity of considering previously underestimated Alu polymorphisms in future genetic studies of schizophrenia.

关键词： schizophrenia insertion functional

Preparation of 2D carbon ribbon/Al_(2)O_(3) and nitrogen-doped carbon ribbon/Al_(2)O_(3) by using MOFs as precursors for removing high-fluoride water

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Transactions of Nonferrous Metals Society of China 2021年第7期31卷 2174-2188页

作者： Lei HUANG zhi-hui yang LÜ-ji YAN Sikpaam Issaka ALHASSAN Hai-yin GANG Ting WANG Hai-ying WANG School of Metallurgy and Environment Central South UniversityChangsha 410083China National Engineering Research Center for Control and Treatment of Heavy Metal Pollution Central South UniversityChangsha 410083China School of Environmental Science and Engineering Guangzhou UniversityGuangzhou 510006China

2D carbon ribbon/Al_(2)O_(3) was synthesized with two-dimensional metal organic frameworks 2D-MOFs as precursors using the solvothermal and calcination *** experiments of adsorption parameters such as pH,liquid/solid ratio,adsorption kinetics,adsorption thermodynamics,and anions competitions were investigated to understand the adsorptive behavior of fluoride on carbon ribbon/Al_(2)O_(3) and nitrogen-doped carbon ribbon/Al_(2)O_(3).The adsorption of fluoride on carbon ribbon/Al_(2)O_(3) could be described as the chemical and multilayer adsorption,while the adsorption of fluoride on nitrogen-doped carbon ribbon/Al_(2)O_(3) followed the chemical and monolayer adsorption *** fluoride on nitrogen-doped carbon ribbon/Al_(2)O_(3) had a much faster adsorption rate of 3.1×10^(−7) m/s than carbon ribbon/Al_(2)O_(3),which was 1.2×10^(−7) m/*** nitrogen-doping on carbon ribbon enhances structural defects and improves the adsorption performance of ***,the diacetylene linkages(—C≡C—)and pyridinic-N were studied to understand their influences on removing *** result indicates that carbon ribbon and nitrogen-doped ribbon could serve as good adsorbents for removing fluoride.

关键词： pyridinic-N carbon ribbon MIL-53(Al) adsorption fluoride removal

Synthesis of phosphate-embedded calcium alginate beads for Pb(Ⅱ) and Cd(Ⅱ) sorption and immobilization in aqueous solutions

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Transactions of Nonferrous Metals Society of China 2016年第8期26卷 2230-2237页

作者： Yun-yan WANG Wen-bin YAO Qing-wei WANG zhi-hui yang Li-fen LIANG Li-yuan CHAI School of Metallurgy and Environment Central South University Changsha 410083 China Chinese National Engineering Research Center for Control & Treatment of Heavy Metal Pollution Central South University Changsha 410083 China

The phosphate-embedded calcium alginate beads were successfully synthesized based on sodium alginate, calcium dihydrogen phosphate and sodium hydrogen carbonate. Scanning electron microscopy, Fourier transformed infrared (FTIR) spectroscopy and X-ray diffraction (XRD) were conducted to characterize the morphology and structure of the phosphate-embedded calcium alginate beads. The effects of pH and the initial concentration of the metal ions on Pb(II) and Cd(II) sorption by the beads were investigated. The optimal pH values for Pb(II) and Cd(II) sorption are 4.0 and 5.5, respectively. The optimal initial concentrations of Pb(II) and Cd(II) are 200 mg/L and 25 mg/L, correspondingly, and the removal efficiencies are 94.2% and 80%,respectively. The sorption mechanism is that the heavy metal ions accessed the beads firstly due to the large surface area, combinedwith OH?, and then precipitated with phosphate radical, which was proven by FTIR and XRD. The sorption of Pb(II) and Cd(II) isfitted to Langmuir isotherm model with R2 values of 0.9957 and 0.988, respectively. The sorption capacities of Pb(II) and Cd(II) are263.16 mg/g and 82.64 mg/g, respectively. The results indicate that the phosphate-embedded calcium alginate beads could be appliedto treating Pb(II)/Cd(II)-containing wastewater and it could be implied that the synthesized beads also could be used as a kind of soil ameliorant for remediation of the heavy metal contaminated paddy soil.

关键词： adsorption immobilization lead cadmium phosphate-embedded calcium alginate beads

Cr(Ⅵ) reduction in chromium-contaminated soil by indigenous microorganisms under aerobic condition

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Transactions of Nonferrous Metals Society of China 2019年第6期29卷 1304-1311页

作者： Chang-qing SU Li-qing LI zhi-hui yang Li-yuan CHAI Qi LIAO Yan SHI Jia-wei LI School of Energy Science and Engineering Central South University Changsha 410083 China School of Metallurgy and Environment Central South University Changsha 410083 China Chinese National Engineering Research Center for Control and Treatment of Heavy Metal Pollution Central South University Changsha 410083 China

Bioremediation plays an increasingly important role in the remediation of chromium-contaminated soil because it is an environmentally friendly technology. To investigate the Cr(Ⅵ)reduction process by indigenous microorganisms in soil, a batch of incubation experiments were carried out in a bioreactor under aerobic conditions. The results showed that in the presence of indigenous microorganisms, the Cr(Ⅵ) concentration in the chromium-contaminated soil decreased from 1521.9 to 199.2 mg/kg within 66 h with culture medium addition, while a slight decrease in the Cr(Ⅵ) concentration was found in the sterilized soil,implying that the indigenous microorganisms contributed to the Cr(Ⅵ) reduction. In the microbial remediation process, Cr(Ⅵ)microbial reduction occurred after the reduction of NO3-, Mn4+ and Fe3+ and,before SO42- reduction. The reduction process of Cr(Ⅵ) can be divided into two phases, characterized by the exponential equation model of microbial reduction and the linear equation model of the combined effect of the major ions. It can be concluded that indigenous Cr(Ⅵ)-reducing bacteria have a potential application for in-situ remediation of Cr(Ⅵ)-contaminated soil.

关键词： Cr(Ⅵ)-contaminated soil indigenous microorganisms microremediation kinetics

PRECODING AND DECODING DESIGN FOR TWO-WAY MIMO AF MULTIPLE-RELAY SYSTEM

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Journal of Electronics(China) 2012年第Z2期 177-189页

作者： zhi hui yang Longxiang Zhu Hongbo (Jiangsu Key Lab of Wireless Communication, Nanjing University of Posts and Telecommunications, Nanjing 210003, China)

In this paper, a joint precoding and decoding design scheme is proposed for two-way Multiple-Input Multiple-Output (MIMO) multiple-relay system. The precoding and decoding matrices are jointly optimized based on Minimum Mean-Square-Error (MMSE) criteria under transmit power constraints. The optimization problem is solved by using a convergent iterative algorithm which in-cludes four sub-problems. It is shown that due to the difficulty of the block diagonal nature of the relay precoding matrix, sub-problem two cannot be solved with existing methods. It is then solved by converting sub-problem two into a convex optimization problem and a simplified method is proposed to reduce the computational complexity. Simulation results show that the proposed scheme can achieve lower Bit Error Rate (BER) and larger sum rate than other schemes. Furthermore, the BER and the sum rate performance can be improved by increasing the number of antennas for the same number of relays or increasing the number of relays for the same number of antennas.

关键词： Precoding and decoding design Iterative algorithm Two-way relaying Bit Error Rate (BER) Sum rate

Liver synthetic function in predicting the prognosis of pregnancy complicating fulminant hepatitis

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Chinese Medical Journal 2007年第24期120卷 2311-2313页

作者： LI Xiao-mao DENG Liu-zhi SHEN hui-min yang Yue-bo LI Meng-xiong CHEN Xiao-wei YIN Yu-zhu ZHOU Shui-sheng Department of Obstetrics and Gynecology Third Affiated Hospital of Sun Yat-sen University Guangzhou 510630 China

Pregnancy complicating fulminant hepatitis is characterized by rapid progress, complicated clinical symptoms, and association with blood coagulation dysfunction, hepatic encephalopathy, hepatorenal syndrome, toxic enteroparalysis and infection. Late pregnancy complicating fulminant hepatitis, which has a high fatality rate, is one of the maior causes of death of gravida and puerperant in China. Searching for exact objective indexes and correct judgement of the prognosis is extremely important to clinical work. The indexes of liver function mainly include （1） indexes for the damage of hepatic cells and its degree such as alanine transaminase （ALT）, etc; （2） indexes for the synthesis function of hepatic cells such as albumin （ALB）, total cholesterol （CHOL）, prothrombin time （PT）, prothrombin activity （PTA）, etc; （3） indexes for the function of liver excretion, metabolism and detoxication such as total bilirubin （TBIL）, total bile acid （TBA）, blood ammonia （NH3）, etc.

关键词： pregnancy fulminant hepatitis liver function prognosis