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Natural continuous influent nitrifier immigration effects on nitrification and the microbial community of activated sludge systems

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Journal of Environmental Sciences 2018年第12期30卷 159-167页

作者： Lifang yu Ren Li Robert Delatolla ru zhang Xiuling Yang Dangcong Peng School of Environmental and Municipal Engineering Xi'an University of Architecture and Technology Department of Civil Engineering University of Ottawa

Two sequencing batch reactors（SBRs） were operated for 100 days under aerobic conditions,with one being fed with unsterilized municipal wastewater（USBR）, and the other fed with sterilized municipal wastewater（SSBR）. Respirometric assays and fluorescence in situ hybridization（FISH） results show that active nitrifiers were present in the unsterilized influent municipal wastewater. The maximum ammonia utilization rate（AUR） and nitrite utilization rate（NUR） of the unsterilized influent were 0.32 ± 0.12 mg NH4＋-N/（L·hr） and0.71 ± 0.18 mg NO2--N/（L·hr）. Based on the maximum utilization rates, the estimated seeding intensity for the ammonia oxidizing bacteria（AOB） and nitrite oxidizing bacteria（NOB） of the USBR was 0.08 g AOB/（g AOB·day） and 0.20 g NOB/（g NOB·day） respectively. The fraction of nitrifiers/total bacteria in the influent was 5.35% ± 2.1%, the dominant AOB was Nitrosomonas spp., Nitrosococcus mobilis hybridizated with Nsm156, and the dominant NOB was Nitrospira hybridizated with Ntspa662. The influent nitrifiers potentially seeded the activated sludge of the bioreactor and hence demonstrated a mitigation of the acclimatization times and instability during start-up and early operation. The AUR and NUR in the USBR was 15% and 13% higher than the SSBR respectively during the stable stage, FISH results showed that nitrifiers population especially the Nitrospira in the USBR was higher than that in the SSBR. These results indicate that the natural continuous immigration of nitrifiers from municipal influent streams may have some repercussions on the modeling and design of bioreactors.

关键词： Nitrifier immigration Influent wastewater Seeding effect Nitrification Nitrospira

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Effect of near PT-symmetric potentials on nonlinear modes for higher-order generalized Ginzburg–Landau model

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Communications in Theoretical Physics 2022年第12期74卷 1-8页

作者： Da Lin Kai-ru Dong Jia-rui zhang yu-Jia Shen College of Science China Agricultural UniversityBeijing 100083China

In this paper,we study the higher-order generalized Ginzburg–Landau model which contributes to describing the propagation of optical solitons in *** means of the Hirota bilinear method,the analytical solutions are obtained and the effect of relevant parameters is *** by the near parity-time-symmetric potentials,the nonlinear modes with 5%initial random noise are numerically simulated to possess stable ***,the evolution of nonlinear modes is displayed through the adiabatical change of some *** investigation of the present work is intended as a contribution to the work for the higher-order generalized Ginzburg–Landau model.

关键词： generalized Ginzburg–Landau model parity-time symmetry stability of soliton solutions

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Chloride-Promoted Photoelectrochemical C-H Silylation of Heteroarenes

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Chinese Journal of Chemistry 2023年第22期41卷 2963-2968页

作者： Xin-ru Zhao yu-Chen zhang Zhong-Wei Hou Lei Wang Advanced Research Institute and School of Pharmaceutical Sciences Taizhou UniversityJiaojiangZhejiang 318000China Department of Chemistry Huaibei Normal UniversityHuaibeiAnhui 235000China State Key Laboratory of Organometalic Chemistry Shanghai lnstitute of Organic ChemistryChinese Academy of SciencsShanghai200032China

A photoelectrochemical approach for the C-H silylation of heteroarenes through dehydrogenation cross-coupling with H2 evolution has been *** photoelectrochemical C-H silylation depends on hydrogen atom transfer(HAT)from silanes to Cl-radical generated through the light-induced homolytic cleavage of Cl2,in which Cl2 was produced by electrochemical oxidation of chloride.A large number of silylated heterocyclic molecules are rapidly constructed in satisfactory yields without relying on oxidants and metal reagents.

关键词： Photoelectrochemistry Silyl radicals C-H silylation Dehydrogenation N-Heterocycles Cross-coupling Oxidation

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Re-recognition of the Effects of Phosphorus and Boron on the γ’’ and γ’ Phases in IN718 Alloy

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Acta Metallurgica Sinica(English Letters) 2019年第3期32卷 372-380页

作者： An-Wen zhang Yang Li Sha zhang Fang Liu Wei-Hong zhang Lian-Xu yu Wen-ru Sun Institute of Metal Research Chinese Academy of Sciences College of Material Science and Engineering University of Science and Technology of China

The effects of P and B on the matrix strength and precipitations of γ’ and γ’’ phases in the grain interior were re-recognized in this study. The combination addition of P and B markedly accelerated the precipitations of γ’ and γ’’ phases and strengthened the matrix of IN718 alloy when air-cooled from high temperature, while made no difference when waterquenched from high temperature. The effect of single addition of P on the precipitations of γ’’ and γ’ phases was the same with that of the combination addition of P and B, while the single addition of B had no effect on the precipitations of the two phases. Therefore, it was P rather than B which accelerated the precipitations of γ’ and γ’’ phases. P could take part in the precipitations of γ’ and γ’’ phases, which was revealed by electrochemical extraction and quantitative analysis of chemical composition. It also revealed that P atoms were dissolved in the c matrix to a relatively high degree at the temperature that γ’ and γ’’ phases began to precipitate, and consequently the precipitations of γ’ and γ’’ phases were accelerated. The first-principle calculation indicated that P decreased the formation enthalpies of γ’ and γ’’ phases when it occupied the Ni lattice sites in the two phases, which explained the effect of P on the γ’ and γ’’ phases.

关键词： IN718 superalloy Phosphorus and boron γ’’ and γ’phases Hardness

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Effect of Heat Treatment on the Microstructure and Mechanical Properties of the Modified 718 Alloy

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Acta Metallurgica Sinica(English Letters) 2018年第11期31卷 1224-1232页

作者： Da-Wei Han Lian-Xu yu Fang Liu Bin zhang Wen-ru Sun School of Materials Science and Engineering Northeastern University Shenyang 110819 China Chongqing Skyrizon Aero-engine Co. Ltd Chongqing 401135 China Institute of Metal Research Chinese Academy of SciencesShenyang 110016 China

M718 alloy with an extra high Mo content of 7.50 wt% which reduced Nb addition and increased A1 and Ti additionswithin the composition specifications of 718 alloy has been designed to increase the service temperature of 718 alloy. Andthe effect of the heat treatment on the microstructure and mechanical properties of M718 alloy has been investigated in thisstudy. The results showed that Laves phase precipitated on the grain boundaries of M718 alloy instead of 6-Ni3Nb phase in718 alloy, and γ″ and γ′ phases precipitated in the matrix of M718 alloy as that in 718 alloy. Increasing the solutiontemperature from 960 to 1050 ℃ noticeably reduced the intergranular precipitation of Laves phase. The precipitation ofLaves phase was appropriate at 1020 ℃ for improving the grain boundary cohesion. Increasing the two-stage agingtemperatures markedly increased the sizes of γ″ and γ′ phases. As a result, the strength of M718 alloy increased.

关键词： Heat treatment Mo 718 alloy Microstructure Mechanical properties

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Size-controllable synthesis of monodispersed nitrogen-doped carbon nanospheres from polydopamine for high-rate supercapacitors

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Frontiers of Chemical Science and Engineering 2023年第11期17卷 1788-1800页

作者： Ning zhang Fu-Cheng Gao Hong Liu Feng-yun Wang ru-Liang zhang Qing yu Lei Liu School of Materials Science and Engineering Shandong University of Science and TechnologyQingdao 266590China College of Physics and State Key Laboratory of Bio Fibers and Eco Textiles Qingdao UniversityQingdao 266071China

Monodispersed nitrogen-doped carbon nanospheres with tunable particle size(100-230 nm)were synthesized via self-polymerization of biochemical dopamine in the presence of hexamethylenetetramine as a buffer and F127 as a size controlling *** can mildly release NH3,which in turn initiates the polymerization reaction of *** carbon nanospheres obtained exhibited a significant energy storage capability of 265 F·g^(-1)at 0.5 A·g^(-1)and high-rate performance of 82%in 6 mol·L^(-1)KOH(20 A·g^(-1)),which could be attributed to the presence of abundant micromesoporous structure,doped nitrogen functional groups and the small particle ***,the fabricated symmetric supercapacitor device displayed a high stability of 94%after 5000 cycles,revealing the considerable potential of carbon nanospheres as electrode materials for energy storage.

关键词： carbon nanospheres size-controlled nitrogen-doped high-rate supercapacitors

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武夷山脊椎动物寄生吸虫

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武夷科学 1985年第1期7卷 129-139页

作者：汪溥钦孙毓兰赵玉如张文焕王元玲福建师范大学生物系

我们于1981年经初步调查,报告武夷山脊椎动物寄生蠕虫120种,其中寄生吸虫61种。近年来我们继续进行采集,又检得过去未经报道的吸虫50种,分隶于12科21属,其中5种是新种,1种是我国新纪录,兹记载如后。新种模式标本藏福建师范大学生物系寄... 详细信息

我们于1981年经初步调查,报告武夷山脊椎动物寄生蠕虫120种,其中寄生吸虫61种。近年来我们继续进行采集,又检得过去未经报道的吸虫50种,分隶于12科21属,其中5种是新种,1种是我国新纪录,兹记载如后。新种模式标本藏福建师范大学生物系寄生动物研究室。

关键词： Ph 腹吸盘口吸盘武夷山脊椎动物

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Fast coding in digital steganography

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The Journal of China Universities of Posts and Telecommunications 2009年第6期16卷 92-96页

作者： FU yu zhang ru MA Song-ya QU Zhi-guo Information Security Center State Key Laboratory of Networking and Switching Technology Beijing University of Posts and Telecommunications Beijing 100876 China Key Laboratory of Network and Information Attack and Defense Technology of MOE Beijing University of Posts and Telecommunications Beijing 100876 China College of Mathematics and Information Science Henan University Kaifeng 475004 China

Dynamical running coding was previously proposed as a method for construction of steganographic schemes in digital *** this article,a new approach of fast coding is proposed to improve steganographic *** embedding method is discussed in two cases of constructing different generating matrix;however,the proposed method generalizes the problem to only one case by changing the construction method from the original ***,the complexity of the proposed method is less than the original ***,both theoretical analysis and experiment results show better performance in terms of distortions and alterations of the cover objects when embedding the same amount of information data bits,which proves a better resistance against steganalysis.

关键词： cover object fast coding secret message steganography

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猪流行性腹泻病毒M基因克隆与分子特征分析

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中国畜牧兽医 2017年第9期44卷 2573-2579页

作者：毕俊萱陈奕熹龙安格赵茹钰张涵铱唐明霞易华山马鲜平西南大学动物科学学院重庆402460

为更好地了解近年来中国暴发的猪流行性腹泻(porcine epidemic diarrhea,PED)疫情,本研究采集荣昌及其周边地区疑似患有PED的猪小肠上皮组织进行RNA的提取,扩增猪流行性腹泻病毒(porcine epidemic diarrhea virus,PEDV)M基因序列,进行... 详细信息

为更好地了解近年来中国暴发的猪流行性腹泻(porcine epidemic diarrhea,PED)疫情,本研究采集荣昌及其周边地区疑似患有PED的猪小肠上皮组织进行RNA的提取,扩增猪流行性腹泻病毒(porcine epidemic diarrhea virus,PEDV)M基因序列,进行序列分析及M蛋白分子特性研究。结果显示,M基因开放阅读框(ORF)长为681bp,编码226个氨基酸。通过DNAMAN软件及系统进化树分析发现,本试验中PEDV与GenBank中参考毒株的M基因氨基酸同源性在96.0%以上,其中与广东毒株CH/SD-M/2012株亲缘关系最为相近,同源性高达96.9%,表明M基因相对比较保守。通过M蛋白同源建模及功能预测发现,M蛋白晶体模型同SARS冠状病毒nsp14-nsp10复合体5c8s.1.A及NAD激酶Ⅰ2i1w.1.B模型序列相似性为27.69%、15.07%;其高级结构中在第110—113、118—125、132—136、140—145、147—152、154—157、160—173位氨基酸处存在7个α螺旋,在第98—100、102—107、135—137、139—145、149—154氨基酸存在5个锌指结构配体,M蛋白为PEDV病毒基因组复制酶的多聚蛋白。

关键词：猪流行性腹泻病毒 M基因基因克隆序列分析

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Well-dispersed NiCoS_(2) nanoparticles/rGO composite with a large specific surface area as an oxygen evolution reaction electrocatalyst

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Rare Metals 2021年第11期40卷 3156-3165页

作者： Duan Wang yu-Xin Chang Ya-ru Li Shi-Lin zhang Sai-Long Xu School of Environment and Safety Engineering North University of ChinaTaiyuan 030051China State Key Laboratory of Chemical Resource Engineering Beijing University of Chemical TechnologyBeijing 100029China Institute for Superconducting and Electronic Materials School of MechanicalMaterialsMechatronics and Biomedical EngineeringUniversity of WollongongWollongong 2522Australia

Developing efficient oxygen evolution reaction(OER) electrocatalysts such as transition metal sulfides(TMSs) is of great importance to advance renewable hydrogen fuel toward further practical ***,NiCoS_(2) nanoparticles well decorated on double-sided N-doped reduced graphene oxide sheets(NiCoS_(2)/rGO) are prepared from an Al-containing ternary NiCoAl-layered double hydroxide precursor(NiCoAl-LDH) grown on GO support as an OER *** Al-confinementassisted sulfurization,followed by selective acid treatment,endows the resulting NiCoS_(2)/rGO composite with the advantages:well-dispersed NiCoS_(2) nanoparticles,dualsided rGO support,as well as a large specific surface area of 119.4 m^(2)·g^(-1) and meso-/macroporous size *** NiCoS_(2)/rGO electrocatalyst exhibits an overpotential of 273 mV at 10 mA·cm^(-2) and a good stability of 24 h,which outperform those of the counterparts of NiS_(2)/rGO and CoS_(2)/*** results of electrochemical active surface area and electrochemical impedance spectra experimentally provide convincing rationales of the information of active sites and good conductivity,both underpin the enhanced electrocatalytic performances.

关键词： NiCoS_(2)nanoparticles Double-sided support Layered double hydroxide precursor Large specific surface area Oxygen evolution reaction

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