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A novel multistage anoxic/aerobic process with sludge regeneration zone (R-MAO) for advanced nitrogen removal from domestic sewage

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Journal of Environmental Sciences 2023年第2期124卷 758-768页

作者： Lin Cao Rong Sun Wenyi dong Hongjie Wang Zhongyi Dai Xue Wang Jin xie hua Li School of Chemical Engineering Huaqiao UniversityXiamen 361021China State Key Laboratory of Urban Water Resource and Environment School of Environment Harbin Institute of TechnologyHarbin 150090China School of Civil and Environmental Engineering Harbin Institute of Technology ShenzhenShenzhen 518055China Central and Southern China Municipal Engineering Design&Research Institute Co. Ltd.Wuhan 430010China Shenzhen Water Group Co. Ltd.Shenzhen 518000China

To achieve advanced nitrogen removal from actual municipal sewage,a novel multistage anoxic/aerobic process with sludge regeneration zone(R-MAO)was *** reactor was used to treat actual domestic sewage and the nitrogen removal capacity of the sludge regeneration zone(R zone)was investigated during the long-term *** best performance was obtained at the R zone’s Oxidation-Reduction Potential(ORP)of-50±30 mV and hydraulic residence times(HRT)of 1.2 *** average effluent COD,TN,NH_(4)^(+)-N and NO_(3)^(−)-N of the R-MAO process were 18.0±2.3,7.5±0.6,1.0±0.5 and 4.6±0.4 mg/L,respectively,with the corresponding removal efficiency of COD,TN and NH_(4)^(+)-N were 92.9%±1.0%,84.1%±1.5% and 97.5%±1.1%.Compared to the sole MAO system,the TN removal efficiency of the R-MAO increased by 10.1%.Besides,under the optimal conditions,the contribution of the R zone in the R-MAO that removal COD,TN,NH_(4)^(+)-N and NO_(3)^(−)-N were 0.36,0.15,0.032 and 0.82 g/***-throughput sequencing results showed that uncultured_bacterium_f_Burkholderiaceae(5.20%),OLB8(1.04%)and Ottowia(1.03%)played an important role in denitrification in the R *** study provided effective guidance for the design and operation of the R-MAO process in domestic sewage treatment.

关键词： Advanced nitrogen removal Multistage anoxic/aerobic process Sludge regeneration zone(R zone) Microbial community

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Phase-space tailoring for deterministic and in-situ regulation of photon transport

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Science China(Physics,Mechanics & Astronomy) 2022年第5期65卷 141-142页

作者： Chun-hua dong CAS Key Laboratory of Quantum Information University of Science and Technology of ChinaHefei 230026China CAS Center For Excellence in Quantum Information and Quantum Physics University of Science and Technology of ChinaHefei 230026China

Manipulating optical fields in microcavities is of great significance in fundamental optical physics and the development of advanced optical technology[1-7].In previous work,manipulating light dynamics in optical microcavities was carried out in real or momentum *** it has been successfully applied in many fields such as quantum optics and precision measurement.

关键词： space measurement momentum

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Activity Calculation by Application of Sub-Regular Solution Model in Binary Oxide Systems

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Journal of Iron and Steel Research International 2012年第7期19卷 33-38页

作者： HOU Yan-qing xie Gang TAO dong-ping LI Rong-xing YU Xiao-hua Faculty of Metallurgical and Energy Engineering Kunming University of Science and TechnologyKunming 650093YunnanChina

To confirm sub-regular solution model valid for predicting the activity of component in binary oxide systems, seven systems in the whole concentration and twelve systems presenting saturation concentration have been studied. The total average relative errors of component 1 and 2 are 3.2 % and 4.1% respectively by application of the sub-regular solution model into the systems within the whole concentration. However, the total average relative errors are 16 % and 1088 % in the systems presenting saturation concentration. The results show that sub-regular solu- tion model is not good for predicting the systems presenting saturation concentration, especially for the systems con- taining acidic or neutral oxide. The reason may be that the influence of the two types of oxide on the configuration is greater in binary oxide systems. These oxides can be present in the form of complex anion partly, Si-O, Al-O, Ti-O and so on, for example （SiO4）4-. That is contrary to sub-regular solution model which is supposed that the oxide systems consist of cation and O2-. But compared with regular solution model and quasi-regular solution model, sub- regular solution model is closer to the characteristics of actual solution and the calculated results are superior.

关键词： sub-regular solution models binary oxide system activity

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Preparation and Characterization of Thermoresponsive Hyperbranched Polyethylenimine with Plenty of Reactive Primary Amine Groups

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Chinese Journal of Polymer Science 2014年第7期32卷 961-968页

作者： hua-ji Liu Run-hua dong 陈宇 Department of Chemistry School of SciencesTianjin UniversityCollaborative Innovation Center of Chemical Science and Engineering

Certain amount of primary amine （NH2） groups of hyperbranched polyethylenimine （HPEI） was first protected by Boc groups. Subsequently, the residual reactive amine groups were reacted with isobutyric anhydride to introduce isobutyramide （IBAm） groups to HPEI. Finally, Boc groups were deprotected to result in HPEI-IBAm-NH2 with 18% of primary amine terminals on the periphery and 80% of IBAm terminal groups （abbreviated as HPEI-IBAm0.80-NH2）. 1H-NMR characterization proved the successful preparation of the product in each step. Compared with its spatial isomer HPEI- IBAm0.8o without primary amine groups, IH-NMR spectra verified that more IBAm groups were located in the interior of HPEI-IBAm0.80-NH2. The further modification of ***-NH2 and HPEI-IBAmo.8o with p-nitrobenzaldehyde demonstrated that ***-NH2 was more reactive than HPEI-IBAm0.80 due to its possession of primary amines. Turbidimetry measurements showed that HPEI-IBAm0.80-NH2 was thermoresponsive in water. In the pH range of 9.5-10 its cloud point temperature （Top） was constant, and it increased obviously upon decreasing the pH below 9.5. The thermoresponsive HPEI-IBAmo.8 exhibited the similar trend, but the pH threshold to achieve the constant Top was around 8.5. Moreover, HPEI-IBAm0.8-NH2 showed higher Top and broader phase transition than HPEI-IBAm0.8. The mechanism leading to the different thermoresponsive properties between HPEI-IBAm0.8-NH2 and its spatial isomer HPEI-IBAm0.8 was discussed.

关键词： Hyperbranched Phase transition Polyethylenimine Spatial isomer Thermoresponsive polymers.

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Total duration of negative surplus for a MAP risk model

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Applied Mathematics(A Journal of Chinese Universities) 2015年第4期30卷 397-406页

作者： dong hua ZHAO Xiang-hua School of Statistics Qufu Normal University

In this paper, we study the risk model with Markovian arrivals where we allow the surplus process to continue if the surplus falls below zero. We first derive expressions for the severity of ruin. Then by using the strong Markovian property of a two-dimensional Markov process and the expression for the severity of ruin, we obtain the Laplace transform of the total duration of negative surplus.

关键词： total duration of negative surplus Markovian arrival process deficit.

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Elliptic Function Waves of Spinor Bose-Einstein Condensates in an Optical Lattice

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Communications in Theoretical Physics 2009年第3期51卷 445-449页

作者： xie Yuan-dong School of Physics and Telecommunication Engineering South China Normal University Guangzhou 510006 China Laboratory of Photonic Information Technology South China Normal University Guangzhou 510006 China

An improved nonlinear Schrodinger equation different from usual one of spinor Bose-Einstein condensates （BECs） in an optical lattice are obtained by taking into account a nonlinear term in the equation of motion for probability amplitude of spins carefully. The elliptic function wave solutions of the model are found under specific boundary condition, for example, the two ends of the atomic chain are fixed. In the case of limit the elliptic function wave solutions are reduced into spin-wave-like or solitons.

关键词： spinor Bose Einstein condensates optical lattice elliptic tunction wave solution soliton

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Hydrodynamic Characteristics of Undular Tidal Bores in the Qiantang River Based on Field Observations

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China Ocean Engineering 2024年第3期38卷 505-518页

作者： ZHANG Shu-yu PAN Cun-hong ZHANG Shen-yang LI Ruo-hua CHENG Wenlong xie dong-feng Zhejiang Tongji Vocational College of Science and Technology Hangzhou 311231China Zhejiang Institute of Hydraulics and Estuary Hangzhou 310020China

Understanding the undular tidal bores in the Qiantang River is essential for effective river management and *** breaking tidal bores have been studied extensively, reports on undular tidal bores in the Qiantang Riverremain limited. Furthermore, observed data on undular tidal bores fulfilling the requirements of short measurementtime intervals, and spring, medium, and neap tide coverage, and providing detailed data for the global vertical stratificationof flow velocity are quite limited. Based on field observations at Qige in the Qiantang estuary, we analyzedthe characteristics of undular tidal bores. The results showed that the flooding amplitude (a) of the first wave isalways larger than its ebbing amplitude (b). Moreover, the vertical distribution of the maximum flood velocity exhibitesthree shapes, influenced by the tidal range, while that of the maximum ebb velocity exhibites a single shape. Duringthe initial phase of the flood tide in the spring and medium tides, the upper water body experiences multiple oscillatingchanges along the flow direction, corresponding to the alternating process of the crest and trough of the tide levelupon the arrival of the tidal bore. The tidal range is a crucial parameter in tidal bore hydrodynamics. By establishingthe relationship between hydrodynamic parameters and tidal range, other hydrodynamic parameters, such as the tidalbore height, maximum flood depth–averaged velocity, maximum flood stratified velocity at the measurement points,and duration of the flood tide current, can be effectively predicted, thereby providing an important reference for rivermanagement and maintenance.

关键词： tidal bores Qiantang Estuary tidal bore height tidal bore velocity propagation speed

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Optimizing urban block morphologies for net-zero energy cities:Exploring photovoltaic potential and urban design prototype

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Building Simulation 2024年第4期17卷 607-624页

作者： Xiaotian Geng dong xie Zhonghua Gou School of Urban Design Wuhan UniversityWuhanChina

The morphology of urban areas plays a crucial role in determining solar potential,which directly affects photovoltaic capacity and the achievement of net-zero *** study focuses on the City of Melbourne to investigate the utilization of solar energy across different urban densities and proposes optimized *** analysis encompasses blocks with diverse population densities,examining medium and high-density *** utilizing a multi-objective genetic optimization approach,the urban morphology of these blocks is *** findings indicate that low-density blocks exhibit photovoltaic potential ranging from 1 to 6.6 times their total energy *** and high-density blocks achieve photovoltaic potential levels approximately equivalent to 40%-85%of their overall energy ***,significant variations in photovoltaic potential are observed among different urban forms within medium and high-density ***“elevated corners with central valley”prototype is proposed as an effective approach,enhancing the overall photovoltaic potential by approximately 14%.This study introduces novel analytical concepts,shedding light on the intricate relationship between urban morphologies and photovoltaic potential.

关键词： net-zero energy solar energy urban density urban morphology multi-objective optimization photovoltaic potential

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X-ray pulsar signal detection using photon interarrival time

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Journal of Systems Engineering and Electronics 2013年第6期24卷 899-905页

作者： Qiang xie Luping Xu hua Zhang School of Electronic Engineering Xidian University

The distribution probability of the photon interarrival time （PIT） without signal initial phases is derived based on the Poisson model of X-ray pulsar signals, and a pulsar signal detection algorithm employing the PIT sequence is put forward. The joint probability of the PIT sequence is regarded as a function of the distribution probability and used to compare a constant radiation intensity model with the nonhomogeneous Poisson model for the signal detection. The relationship between the number of detected photons and the probabilities of false negative and positive is studied, and the success rate and mean detection time are estimated based on the number of the given photons. For the spacecraft velocity data detection, the changes of time of photon arrival （TOPA） and PIT caused by spacecraft motion are presented first, then the influences on detection are analyzed respectively. By using the analytical pulse profile of PSR B0531＋21, the simulation of the Xray pulsar signal detection is implemented. The simulation results verify the effectiveness of the proposed method, and the contrast tests show that the proposed method is suitable for the spacecraft velocity data detection.

关键词： pulsar signal detection photon interarrival time (PIT) Poisson model

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Stable anode-free zinc-ion batteries enabled by alloy network-modulated zinc deposition interface

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Journal of Energy Chemistry 2023年第1期76卷 32-40,I0002页

作者： Shiyin xie Yang Li Liubing dong Collegeof Chemistry and Materials Science Jinan UniversityGuangzhou 511443GuangdongChina

Newly-proposed anode-free zinc-ion batteries(ZIBs)are promising to remarkably enhance the energy density of ZIBs,but are restricted by the unfavorable zinc deposition interface that causes poor cycling ***,we report a Cu-Zn alloy network-modulated zinc deposition interface to achieve stable anode-free *** alloy network can not only stabilize the zinc deposition interface by suppressing 2D diffusion and corrosion reactions but also enhance zinc plating/stripping kinetics by accelerating zinc desolvation and nucleation ***,the alloy network-modulated zinc deposition interface realizes high coulombic efficiency of 99.2%and high *** proof,Zn//Zn symmetric cells with the alloy network-modulated zinc deposition interface present long operation lifetimes of 1900 h at 1 m A/cm^(2)and 1200 h at 5 m A/cm^(2),significantly superior to Zn//Zn symmetric cells with unmodified zinc deposition interface(whose operation lifetime is shorter than 50 h),and meanwhile,Zn3V3O8cathodebased ZIBs with the alloy network-modified zinc anodes show notably enhanced rate capability and cycling performance than ZIBs with bare zinc *** expected,the alloy network-modulated zinc deposition interface enables anode-free ZIBs with Zn3V3O8cathodes to deliver superior cycling stability,better than most currently-reported anode-free *** work provides new thinking in constructing high-performance anode-free ZIBs and promotes the development of ZIBs.

关键词： Zinc-ion battery Zinc anode Zinc deposition interface Anode-free zinc-ion battery Cu-Zn alloy network

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