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Bioremediation of nitrogen-and phosphorus-polluted aquaculture sediment by utilizing combined immobilized effective microorganisms and sediment aeration technology

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International Journal of Agricultural and Biological Engineering 2019年第6期12卷 192-201页

作者： Liangkai wang Xiaohou Shao Ming xu Shuang Chen College of Agricultural Engineering Hohai UniversityNanjing 210098China Key Laboratory of Efficient Irrigation-Drainage and Agricultural Soil-Water Environment in Southern China of Ministry of Education Hohai UniversityNanjing 210098China Jiangsu Provincial Academy of Environment Science Nanjing 210000China

The endogenous release of nitrogen and phosphorus from aquaculture sediment can continuously pollute the water quality in aquaculture *** this study,an integrated bioremediation approach that combined effective microorganisms(EM)with aeration techniques was designed to restore contaminated aquaculture ***,a set of laboratory-scale experiments was designed to evaluate the feasibility of the technology for the bioremediation of nitrogen and *** removal and transformation efficiency indexes of both the overlying water and sediment were *** the obtained results,the combination of sediment aeration and immobilized EM significantly improved the nitrogen and phosphorus removal rate from the overlying water and sediment when compared to other ***,a series of field-scale experiments was further implemented to assess the integrated technique in practical *** field experiments,the variation in the comprehensive trophic level index(TLI)and sediment biodegradation activities(G value)was used to assess the effect of sediment *** pond II which promotes sediment biodegradation,the values of TLI varied from 70.13 to 54.16,and the classification level changed from Hypereutrophic to a Light *** addition,the G value increased from 0.98 kg/(kg·h)to 2.12 kg/(kg·h).The organic matter(OM)and sediment thickness(ST)decreased by 17.4 g/kg and 2.3 cm,*** obtained results indicated that the combination of EM and sediment aeration might be feasible and effective for the remediation of nitrogen-and phosphorus-polluted aquaculture sediment.

关键词： effective microorganisms immobilization technology aeration aquaculture sediment bioremediation

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Shock tube study on auto-ignition characteristics of kerosene/air mixtures

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Chinese Science Bulletin 2011年第13期56卷 1399-1406页

作者： ZHANG YingJia HUANG ZuoHua wang JinHua xu ShengLi State Key Laboratory of Multiphase Flow in Power Engineering Xi' an Jiaotong University Xi' an 710049 China Department of Modern Mechanics University of Science and Technology of China Hefei 230026 China

Ignition delay times are obtained for kerosene/air mixtures behind the reflected shock waves at temperatures between 1445 and 1650 K,at a pressure of 0.11 MPa and an equivalence ratio of 1.0.A nebulization device with Laval nozzle is used to nebulize kerosene and form an aerosol phase,which evaporates and diffuses rapidly behind the incident shock *** auto-ignite behind the reflected shock *** ICCD is used to visualize the kerosene/air mixture's ignition *** mixture's ignition intensity increases with increase in initial *** and irregular flames exist below 1515 K while plane and discontinuous flames exist over 1560 *** delay times decrease with increase in initial *** data shows good agreement with results reported previously in the literature.A new surrogate (consisting of 10% toluene,10% ethylbenzene and 80% n-decane) is proposed for *** et al.'s mechanism is used to simulate the ignition of kerosene with calculations agreeing well with the experimental *** sensitivity of reaction H+O2 OH+O,which shows the highest sensitivity to the ignition delay time,increases with an increase in *** chain breaching reaction of CH3 with O2 accelerates the total reaction rate and the H-atom abstraction of n-decane controls the total reaction *** rate of production and instantaneous heat production indicate that two reactions,H+O2 OH+O and O+H2 OH+H,are the key reactions to the formation of OH radicals,as well as the main endothermic ***,the reaction of R3 is the main heat release reaction during *** structure analysis shows that initial pressure is increased slightly as CO and H2O will appear before main ignition.

关键词：空气混合物煤油自燃特性点火延迟时间冲击管反应速率初始温度数据显示

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LSQP‑DB:a species‑specific quantitative PCR primer database for 307 Lactobacillaceae species

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Systems Microbiology and Biomanufacturing 2023年第4期3卷 593-601页

作者： Rubing Du Shilei wang Qun Wu Yan xu Lab of Brewing Microbiology and Applied Enzymology State Key Laboratory of Food Science and TechnologySynergetic Innovation Center of Food Safety and NutritionSchool of BiotechnologyJiangnan UniversityWuxi 214122JiangsuChina

Quantitative real-time PCR is widely used to determine absolute abundance of microbes in food ***,it remains challenges in the application for quantification at the species level due to the difficulty in designing species-specific primer *** work,using Lactobacillaceae,a dominant family within the lactic acid bacteria that involved in diversity food fermentations,as a case,presents an extendable strategy to design species-specific primer sets for microbial quantita-tive analysis.136,257 species-specific genes were obtained from all 307 species within Lactobacillaceae family through comparative genomics analysis.A total of 130,521 primer sets were designed using species-specific *** them,81,710 primer sets had 100%interspecific specificity and 100%intraspecific coverage,and were reserved to quantify all 307 individual Lactobacillaceae *** primer sets had uniform melting temperature(57–63℃)and product size(100–300 bp),that allowed simultaneously quantify different Lactobacillaceae species with the same qPCR *** then established a Lactobacillaceae species quantitation primer database(LSQP-DB,http://***)containing all 81,710 species-specific primer *** database would facilitate a fast and easy absolute quantitation analysis of all indi-vidual Lactobacillaceae *** work represented the first ever large-scale integration of species-specific primer sets for microorganism,it can be extended to other bacterial and fungal genera to advance development of microbial absolute quantification.

关键词： Lactobacillaceae Primer database Species-specific primer qPCR

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Defect detection of gear parts in virtual manufacturing

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Visual Computing for Industry,Biomedicine,and Art 2023年第1期6卷 76-87页

作者： Zhenxing xu Aizeng wang Fei Hou Gang Zhao School of Mechanical Engineering&Automation Beihang UniversityBeijing 100191China State Key Laboratory of Computer Science Institute of SoftwareChinese Academy of SciencesBeijing 100190China University of Chinese Academy of Sciences Beijing 100049China

Gears play an important role in virtual manufacturing systems for digital twins;however,the image of gear tooth defects is difficult to acquire owing to its non-convex *** this study,a deep learning network is proposed to detect gear defects based on their point cloud *** approach mainly consists of three steps:(1)Various types of gear defects are classified into four cases(fracture,pitting,glue,and wear);A 3D gear dataset was constructed with 10000 instances following the aforementioned classification.(2)Gear-PCNet++introduces a novel Combinational Convolution Block,proposed based on the gear dataset for gear defect detection to effectively extract the local gear information and identify its complex topology;(3)Compared with other methods,experiments show that this method can achieve better recognition results for gear defects with higher efficiency and practicability.

关键词： Defect detection Gear surface Gear dataset Combinational Convolution Block

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Tuning anionic redox activity to boost high-performance sodium-storage in low-cost na_(0.67)Fe_(0.5)Mn_(0.5)O_(2) cathode

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Journal of Energy Chemistry 2022年第10期31卷 214-222,I0005页

作者： Jianyue Jiao Kang Wu na Li Enyue Zhao Wen Yin Zhongbo Hu Fangwei wang Jinkui Zhao Xiaoling Xiao College of Materials Science and Opto-electronic Technology Center of Materials Science and Optoelectronics EngineeringUniversity of Chinese Academy of SciencesBeijing 100049China Songshan Lake Materials Laboratory Dongguan 523808GuangdongChina Spallation Neutron Source Science Center Dongguan 523803GuangdongChina Beijing national Laboratory for Condensed Matter Physics Institute of PhysicsChinese Academy of SciencesBeijing 100190China

na-based layered iron-manganese oxide na_(0.67)Fe_(0.5)Mn_(0.5)O_(2) containing only low-cost elements is a promising cathode for na-ion batteries used in large-scale energy storage ***,the poor cycle stability restricts its practical *** capacity decay of na_(0.67)Fe_(0.6)Mn_(0.5)O_(2) mainly originates from the irreversible anionic redox reaction charge compensation due to the high-level hybridization between oxygen and ***,we rationally design a surface Ti doping strategy to tune the anionic redox reaction activity of na_(0.67)Fe_(0.5)Mn_(0.5)O_(2) and improve its na-storage *** doped Ti ions not only enlarge the na migration spacing layer but also improve the structure stability thanks to the strong Ti-O *** importantly,the d0-shell electronic structure of Ti^(4+) can suppress the charge transfer from the oxidized anions to cations,thus reducing the anionic redox reaction activity and enhancing the reversibility of charge *** modified na_(0.67)Fe_(0.5)Mn_(0.5)O_(2) cathode shows a reversible capacity of 198 mA h g^(-1) and an increased capacity retention from 15% to 73% after about1 month of ***,a superior na-ion diffusion kinetics and rate capability are also *** work advances the commercialization process of na-based layered iron-manganese oxide cathodes;on the other hand,the proposed modification strategy paves the way for the design of high-performance electrode materials relying on anionic redox reactions.

关键词： na-ion battery P2-na_(0.67)Fe_(0.5)Mn_(0.5)O_(2) Anionic redox reaction Surface Ti doping

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Study of Kinetic Characteristics for Drying Rice Husk

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Journal of Harbin Institute of Technology(New Series) 2013年第3期20卷 56-62页

作者： xu-Dong Chen Huai-Bin wang Ming Xie School of Energy Science and Engineering Harbin Institute of Technology

Rice husk (biomass fuel) samples have been dried in drying oven and a series of drying curve for illustrating moisture migration of rice husk have been obtained. It is first research for rice husk drying,and it can provide reference of fuel processing for different boilers which require rice husk with various water contents. In this paper,we apply Page equation to reflect the drying process and obtain drying characteristic curve,then analyze the drying law. Kinetic analysis of the results of moisture migration test has been done,after which, effective moisture diffusion coefficient,activation energy and drying kinetic equation of rice husk samples are obtained in test temperature range (80 - 130 ℃) . And these results show specific influence law of temperature for effective moisture diffusion coefficient.

关键词： rice husk drying characteristic curve effective moisture diffusion coefficient activation energy kinetic analysis

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The structure, expression, and multifaceted role of immune-checkpoint protein VISTA as a critical regulator of anti-tumor immunity, autoimmunity, and inflammation

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Cellular & Molecular Immunology 2018年第5期15卷 438-446页

作者： Wenwen xu TạMinh Hiếu Subramaniam Malarkannan Li wang Department of Microbiology and Immunology MilwaukeeWI 53226USA Department of Medicine MilwaukeeWI 53226USA Department of Pediatrics Medical College of WisconsinMilwaukeeWI 53226USA Blood Research Institute MilwaukeeWI 53226USA

Among various immunoregulatory molecules,the B7 family of immune-checkpoint receptors consists of highly valuable targets for cancer *** targeting two B7 family co-inhibitory receptors,CTLA-4 and PD-1,have elicited long-term clinical outcomes in previously refractory cancer types and are considered a breakthrough in cancer *** the success,the relatively low response rate(20–30%)warrants efforts to identify and overcome additional immune-suppressive *** the expanding list of T cell inhibitory regulators,V domain immunoglobulin suppressor of T cell activation(VISTA)is a unique B7 family checkpoint that regulates a broad spectrum of immune ***,we summarize recent advances that highlight the structure,expression,and multi-faceted immunomodulatory mechanisms of VISTA in the context of autoimmunity,inflammation,and anti-tumor immunity.

关键词： cancer immunotherapy immune checkpoint autoimmunity inflammation tumor immunity

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The MIKE Model Application to Overtopping Risk Assessment of Seawalls and Levees in Shanghai

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International Journal of Disaster Risk Science 2011年第4期2卷 32-42页

作者： Jun wang Shiyuan xu Mingwu Ye Jing Huang College of Resources and Environmental Science East China Normal UniversityShanghai 200062China

This article used MIKE 21 models to evaluate the overtopping risk of seawalls and levees from the combined effect of land subsidence, storm tide, and sea level rise in Shanghai. Typhoon storm tides are the primary natural hazard affecting the Shanghai area. The worst storm tide in recent history was No. 9711, which produced a high tide of 5.99 m. Projections indicate that sea level will rise by 86.6 mm, 185.6 mm, and 433.1 mm by 2030, 2050, and 2100, respectively. The combined impact of these hazards threatens to flood large parts of the Shanghai area in the future. By 2030, 4.31 percent of the total length of the seawalls and levees in Shanghai will be at risk to being overtopped. By 2050, 27.55 percent of all seawalls and levees are likely to be overtopped. By 2100, overtopping will increase to 45.98 percent. The high risk of seawall and levee exposure to overtopping is closely related to the functional impact of land subsidence on the height of existing seawalls and levees. We propose specific engineering measures for Shanghai based on the results of our overtopping simulations.

关键词： storm subsidence tides

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Bulk compositions of metallic Fe-Ni of chondrites: Constraints on fractionation of siderophile and chalcophile elements

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Chinese Journal Of Geochemistry 2009年第3期28卷 271-278页

作者： xu Lin LIN Yangting wang Shijie OUYANG Ziyuan Key Laboratory of the Study of Earth＇s Deep Interior Institute of Geology and Geophysics Chinese Academy of Sciences Beifing 100029 China national Astronomical Observatories Chinese Academy of Sciences Beijing 100012 China Institute of Geochemistry Chinese Academy of Sciences Guiyang 550002 China

Bulk compositions of metallic Fe-Ni from two equilibrated ordinary chondrites, Jilin (H5) and Anlong (H5), and two unequilibrated ones, GRV 9919 (L3) and GRV 021603 (H3), were analyzed by inductively coupled plasma mass spectrometry (ICP-MS). The CI-, Co-normalized abundances of siderophile and chalcophile elements of metallic Fe-Ni from the unequilibrated ordinary chondrites correlate with 50% condensation temperatures (i.e., volatility) of the elements. The refractory siderophile elements (i.e., platinum group elements, Re), Au, Ni and Co show a flat pattern (1.01×CI Co-normalized), while moderate elements (As, Cu, Ag, Ga, Ge, Zn) decrease with volatility from 0.63×CI (Co-normalized, As) to 0.05×CI (Co-normalized, Zn). Cr and Mn show deficit relative to the trend, probably due to their main partition in silicates and sulfides (nonmagnetic). Metallic Fe-Ni from the equilibrated ordinary chondrites shows similar patterns, except for strong deficit of Cr, Mn, Ag and Zn. It is indicated that these elements were almost all partitioned into silicates and/or sulfides during thermal metamorphism. The similar deficit of Cr, Mn, Ag and Zn was also found in iron meteorites. Our analyses demonstrate similar behaviors of W and Mo as refractory siderophile elements during condensation of the solar nebula, except for slight depletion of Mo in the L3 and H5 chondrites. The Mo-depletion of metallic Fe-Ni from GRV 9919 (L3) relative to GRV 021603 (H3) could be due to a more oxidizing condition of the former than the latter in the solar nebula. In contrast, the Mo-depletion of the metallic Fe-Ni from the H5 chondrites may reflect partition of Mo from metal to silicates and/or sulfides during thermal metamorphism in the asteroidal body.

关键词：亲硫元素球粒陨石金属铁铁元素成分散装分馏镍

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Ln2Zr2O7 compounds（Ln=La,Pr, Sm, Y） with varied rare earth A sites for low temperature oxidative coupling of methane

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Chinese Chemical Letters 2019年第6期30卷 1141-1146页

作者： Xiuzhong Fang Lianghui Xia Liang Peng Yuan Luo Junwei xu Luoji xu Xianglan xu Wenming Liu Renyang Zheng Xiang wang Key Laboratory of Jiangxi Province for Environment and Energy Catalysis College of Chemistry Nanchang University Nanchang 330031 China Research Institute of Processing (RIIP) SINOPEC Beijing 100083 China

With the objective to develop catalysts having application potential for oxidative coupling of methane (OCM) at relatively lower temperature. A series of Ln2Zr2O7 compounds with varied rare earth A sites have been prepared by a co-precipitation method. XRD and Raman have proved that pure Ln2Zr2O7 compounds have been successfully prepared for all the catalysts. By decreasing the rA/rB ratio, their crystalline structure transform from an ordered pyrochlore (La2Zr2O7) to a less ordered pyrochlore (Pr2Zr2O7 and Sm2Zr2O7) and eventually to a defective cubic fluorite phase (Y2Zr2O7). H2-TPR, O2-TPD and XPS have testified that the amount of surface active O2-species follows the order of La2Zr2O7>Pr2Zr2O7>Sm2Zr2O7 > Y2Zr2O7, which is well consistent with the reaction performance, indicating that the abundance of surface O2- sites is a critical factor influencing the reaction performance. CO2-TPD has demonstrated that a better catalyst generally possesses a larger amount of surface moderate alkaline sites, which is another factor to affect the reaction performance. It is concluded that the concerted interaction between the two types of surface active sites controls the reaction performance of the Ln2Zr2O7 catalysts. In comparison with the state-of-the art Mn/na2WO4/SiO2, La2Zr2O7, the best catalyst, exhibits much improved reaction performance below 750 ℃.

关键词： Pyrochlore compounds Low temperature OCM A site substitution effects Surface superoxide sites Surface alkaline sites

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