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Science china(Technological Sciences) 2009年第6期52卷 1799-1803页

作者： liu junfeng & feng yujie state key laboratory of urban water resource and environment,harbin institute of technology,harbin 150090,china state key laboratory of urban water resource and environment Harbin Institute of Technology Harbin 150090 China

SnO2 electrodes have many advantages in the degradation of toxic or bio-refractory organic wastewater,and SnO2 is a kind of anode material which has the potential to be widely *** effi-ciency and service life of Ti\SnO2 electrodes are key factors that can influence its *** order to enhance the electrocatalytic characteristics of Ti\SnO2 electrodes,a type of electrocatalytic electrode with nanocoating was prepared by direct current(DC)electrodeposition method and thermal oxidation *** phenol as the model pollutant,the electrochemical degradation efficiencies of elec-trodes with nanocoating and non-nanocoating were *** was demonstrated that the elec-trodes with nanocoating have higher efficiency than that of electrodes with *** degradation time was decreased 33.3% for the same amount of phenol's *** crystal structure of surface coating,the micrograph of electrode surface and the chemical environment of Sn and Sb in the electrode surface were analyzed with the help of XRD,SEM and *** results showed that the surface of electrode was mainly SnO2 crystal with rutile structure and that much adsorbed oxygen in nanocoating was the dominant factor for enhancing the electrocatalytic characteristics.

关键词： inorganic nonmetallic material electrocatalytic characteristics electrodeposition nanocoating SnO2 electrode

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Characterization of nitrogen-fixing moderate halophilic cyanobacteria isolated from saline soils of Songnen Plain in china

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Progress in Natural Science:Materials International 2008年第6期18卷 769-773页

作者： Wei Zhang,yujie feng* state key laboratory of urban water resource and environment,harbin institute of technology,Campus No.1,Apartment No.10,A 901,harbin 150090,china state key laboratory of urban water resource and environment Harbin Institute of Technology Campus No. 1 Apartment No. 10 A 901 Harbin 150090 China

Twenty out of 200 isolates of cyanobacteria mainly from saline soils of Songnen Plain of china were successfully grown on BG11 N-free *** nitrogen-fixing activity was then demonstrated for the 20 isolates in modified BG11 medium using the acetylene reduction *** of them possessed appreciable nitrogenase activity(acetylene reduction)under non-saline conditions;however,at 5%NaCl only 60%of the isolates exhibited a high rate of this activity and 25%were completely negative under these *** cyanobacteria isolates grew well in BG11 medium;nevertheless,growth of the majority of isolates was reduced by about 25-85% in the same medium containing 5%*** activity was detected in 50%of the 20 strains,amylolytic in 45%,and pectinolytic in 10%of the *** cyanobacteria isolates showed also enzymatic activity under saline conditions(6%).The preliminary identi-fication indicated that seven isolates were Nostoc,two were Microcystis,four were Oscillatoria,six were Anabaena,and one isolate was Synechococcus.

关键词： Isolation Songnen Plain of china Nitrogenase activity Salt tolerance Filamentous and globular cyanobacteria

Enhanced electrochemical oxidation of perfluorooctanoic acid on Ti/SnO_(2)-Sb electrode by surface morphology regulation

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Chinese Chemical Letters 2024年第3期35卷 140-143页

作者： Kaiqiang Hou Genwang Zhu yujie feng Yanming liu Xie Quan key laboratory of Industrial Ecology and environmental Engineering(Ministry of Education China)School of Environmental Science and TechnologyDalian University of TechnologyDalian 116024China state key laboratory of urban water resource and environment School of EnvironmentHarbin Institute of TechnologyHarbin 150090China

Electrochemical oxidation is an effective method to degrade persistent organic ***,due to the limited catalytic activity of traditional thin film electrodes,the anodic oxidation process is slow and usually requires high energy ***,Ti/SnO_(2)-Sb electrode with regulated surface structure was reported to enhance the performance for electrochemical oxidation of persistent organic *** electrode deposited with SnO_(2)-Sb nanoneedles(Ti/N-SnO_(2)-Sb)showed higher oxidation *** kinetic constant for perfluorooctanoic acid(PFOA)oxidation was 2.0 h^(-1)and the total organic carbon removal rate was 81.7%(4 h)at a relatively low current density of 6 mA/cm^*** with Ti/SnO_(2)-Sb thin film and nanoparticles,Ti/N-SnO_(2)-Sb significantly improved the electrochemical active area and·OH yield,and simultaneously reduced the electron transfer resistance,which enabled it to oxidize PFOA more rapidly even at a lower *** work provides a new strategy for promoting the electrochemical oxidation performance.

关键词： Electrochemical oxidation Nanoneedle SnO_(2)-Sb Perfluoroalkyl compounds Electrochemical degradation Persistent organic pollutants

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A novel indirect optical method for rock stress measurement using microdeformation field analysis

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Journal of Rock Mechanics and Geotechnical Engineering 2024年第9期16卷 3616-3628页

作者： yujie feng Peng-Zhi Pan Zhaofeng Wang Xufeng liu Shuting Miao state key laboratory of Geomechanics and Geotechnical Engineering Institute of Rock and Soil MechanicsChinese Academy of SciencesWuhan430071China University of Chinese Academy of Sciences Beijing100049China

Stress measurement plays a crucial role in geomechanics and rock engineering,especially for the design and construction of large-scale rock *** paper presents a novel method,based on the traditional stress relief approach,for indirectly measuring rock stress using optical *** proposed method allows for the acquisition of full-field strain evolution on the borehole’s inner wall before and after disturbance,facilitating the determination of three-dimensional(3D)stress information at multiple points within a single *** study focuses on presenting the method’s theoretical framework,laboratory validation results,and equipment design *** theoretical framework comprises three key components:the optical imaging method of the borehole wall,the digital image correlation(DIC)method,and the stress calculation *** validation tests investigate strain field distribution on the borehole wall under varying stress conditions,with stress results derived from DIC strain ***,the optical method demonstrates better measurement accuracy during the unloading stage compared to conventional strain gauge *** relatively high stress levels,the optical method demonstrates a relative error of less than 7%and an absolute error within 0.5 ***,a comparative analysis between the optical method and the conventional contact resistance strain gauge method highlights the optical method’s enhanced accuracy and stability,particularly during the unloading *** proposed optical stress measurement device represents a pioneering effort in the application of DIC technology to rock engineering,highlighting its potential to advance stress measurement techniques in the field.

关键词： Rock stress measurement Optical technology Digital image correlation(DIC)technology Micro-deformation field

Ecological filter walls for efficient pollutant removal from urban surface water

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environmental Science and Ecotechnology 2024年第5期21卷 230-237页

作者： Menglong Liao Ye Qiu Yan Tian Zeng Li Tongtong liu Xinlei feng Guohong liu yujie feng state key laboratory of urban water resource and environment School of EnvironmentHarbin Institute of TechnologyHarbin150090China Heilongjiang Academy of Chemical Engineering No 3Nanhu StreetCentury DistrictHigh-Tech ZoneHarbin150028China

urban surface water pollution poses significant threats to aquatic ecosystems and human *** nitrogen removal technologies used in urban surface water exhibit drawbacks such as high consumption of carbon sources,high sludge production,and focus on dissolved oxygen(DO)concentration while neglecting the impact of DO ***,we show an ecological filter walls(EFW)that removes pollutants from urban surface *** utilized a polymer-based three-dimensional matrix to enhance water permeability,and emergent plants were integrated into the EFW to facilitate biofilm *** observed that varying aeration intensities within the EFW's aerobic zone resulted in distinct DO gradients,with an optimal DO control at 3.19±0.2 mg L^(-1) achieving superior nitrogen removal ***,the removal efficiencies of total organic carbon,total nitrogen,ammonia,and nitrate were 79.4%,81.3%,99.6%,and 79.1%,*** community analysis under a 3 mg L^(-1) DO condition revealed a shift in microbial composition and abundance,with genera such as Dechloromonas,Acinetobacter,unclassified_f__Comamonadaceae,SM1A02 and Pseudomonas playing pivotal roles in carbon and nitrogen ***,the EFW facilitated shortcut nitrification-denitrification processes,predominantly contributing to nitrogen *** low manufacturing cost,flexible application,small artificial trace,and good pollutant removal ability,EFW has promising potential as an innovative approach to urban surface water treatment.

关键词： urban water remediation Ecological filter walls Shortcut nitrification-denitrification Dissolved oxygen gradient Nitrogen removal

Enhancing nitrogen removal in constructed wetlands: The role of influent substrate concentrations in integrated vertical-flow systems

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environmental Science and Ecotechnology 2024年第5期21卷 103-112页

作者： Tongtong liu Da Li Yan Tian Jiajie Zhou Ye Qiu Dongyi Li Guohong liu yujie feng state key laboratory of urban water resource and environment School of EnvironmentHarbin Institute of TechnologyNo.73 Huanghe RoadNangang DistrictHarbin 150090China institute of Chemical Engineering in Heilongjiang Province 3#Nanhu loadHigh Tech R&D Zone of Harbin CityHarbin 150028China

Recent advancements in constructed wetlands(CWs)have highlighted the imperative of enhancing nitrogen(N)removal ***,the variability in influent substrate concentrations presents a challenge in optimizing N removal strategies due to its impact on removal efficiency and *** we show the interplay between influent substrate concentration and N removal processes within integrated vertical-flow constructed wetlands(IVFCWs),using wastewaters enriched with NO_(3)^(-)-N and NH4þ-N at varying carbon to nitrogen(C/N)ratios(1,3,and 6).In the NO_(3)^(-)-N enriched systems,a positive correlation was observed between the C/N ratio and total nitrogen(TN)removal efficiency,which markedly increased from 13.46±2.23%to 87.00±2.37%as the C/N ratio escalated from 1 to ***,in NH4þ-N enriched systems,TN removal efficiencies in the A-6 setup(33.69±4.83%)were marginally 1.25 to 1.29 times higher than those in A-3 and A-1 systems,attributed to constraints in dissolved oxygen(DO)levels and *** community analysis and metabolic pathway assessment revealed that anaerobic denitrification,microbial N assimilation,and dissimilatory nitrate reduction to ammonium(DNRA)predominated in NO_(3)^(-)-N systems with higher C/N ratios(C/N 3).In contrast,aerobic denitrification and microbial N assimilation were the primary pathways in NH4þ-N systems and low C/N NO_(3)^(-)-N systems.A mass balance approach indicated denitrification and microbial N assimilation contributed 4.12-47.12%and 8.51e38.96%in NO_(3)^(-)-N systems,respectively,and 0.55e17.35%and 7.83e33.55%in NH4þ-N systems to TN *** enhance N removal,strategies for NO_(3)-N dominated systems should address carbon source limitations and electron competition between denitrification and DNRA processes,while NH4þ-N dominated systems require optimization of carbon utilization pathways,and ensuring adequate DO and alkalinity supply.

关键词： Constructed wetland Nitrogen removal pathway Denitrification Microbial nitrogen assimilation Enhanced strategy

Effect of confining pressure on rock breaking by high-pressure waterjet-assisted TBM

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Underground Space 2024年第5期18卷 151-161页

作者： Chen Xu yujie Zhu Xiaoli liu Fei Chen Min Zhu Enzhi Wang Sijing Wang School of resource and environment Engineering Wuhan University of TechnologyWuhan 430070China Changjiang institute of Survey PlanningDesign and ResearchWuhan 430010China state key laboratory of Hydroscience and Engineering Tsinghua UniversityBeijing 100084China key laboratory of Geotechnical Mechanics and Engineering of Ministry of water resources Wuhan 430010China

High-pressure waterjet-assisted tunnel boring machine(WTBM)is an efficient method for improving the tunneling performance of a tunnel boring machine(TBM)and reducing the wear of its disc cutters in hard rock with high *** pressure directly affects the efficiency of rock breaking and the configuration of the disc *** this study,we evaluated the effect of confining pressure on WTBM rock breaking by developing a self-designed and manufactured experimental system,including confining pressure loading,TBM disc-cutter penetration,and high-pressure *** macro fracture,acoustic emission(AE),peak normal force drop,and specific energy(SE)were analyzed for four different confining pressures(10,20,30,and 35 MPa).The results showed that the cutting depth of the waterjet increased linearly as the waterjet pressure increased and decreased with the gradual increase in the nozzle moving *** expansion and development of cracks formed rock debris,and the size of the rock fragments decreased with an increase in confining *** the waterjet pressure was 280 MPa,the nozzle moving velocity was 800 mm/min and the kerf space was 75 mm,which indicated that the confining pressure,which was 23.16 MPa,minimized the cutting SE under this ***,regardless of the confining pressure,the maximum normal force of WTBM was less than that of a TBM,whereas the SE of WTBM was less than that of complete TBM cutting mode(CTCM).The average force drop and average drop rate of SE were approximately 25%,and 80%,*** results of this study can inspire the design and mechanism of a TBM assisted by a high-pressure waterjet.

关键词： waterjet Tunnel boring machine(TBM) Confining pressure Specific energy Force drop

FSS: algorithm and neural network accelerator for style transfer

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Science china(Information Sciences) 2024年第2期67卷 253-266页

作者： Yi LING yujie HUANG yujie CAI Zhaojie LI Mingyu WANG Wenhong LI Xiaoyang ZENG state key laboratory of ASIC & System Fudan University Shanghai Explore X technology Co. Ltd.

Neural networks(NNs), owing to their impressive performance, have gradually begun to dominate multimedia processing. For resource-constrained and energy-sensitive mobile devices, an efficient NN accelerator is necessary. Style transfer is an important multimedia application. However, existing arbitrary style transfer networks are complex and not well supported by current NN accelerators, limiting their application on mobile devices. Moreover, the quality of style transfer needs improvement. Thus, we design the Fast Style system(FSS), where a novel algorithm and an NN accelerator are proposed for style transfer. In FSS, we first propose a novel arbitrary style transfer algorithm, Fast Style. We propose a light network that contributes to high quality and low computational complexity and a prior mechanism to avoid retraining when the style changes. Then, we redesign an NN accelerator for Fast Style by applying two improvements to the basic NVIDIA deep learning accelerator(NVDLA) architecture. First, a flexible dat FSM and wt FSM are redesigned to enable the original data path to perform other operations(including the GRAM operation)by software programming. Moreover, statistics and judgment logic are designed to utilize the continuity of a video stream and remove the data dependency in the instance normalization, which improves the accelerator performance by 18.6%. The experimental results demonstrate that the proposed Fast Style can achieve higher quality with a lower computational cost, making it more suitable for mobile devices. The proposed NN accelerator is implemented on the Xilinx VCU118 FPGA under a 180-MHz clock. Experimental results show that the accelerator can stylize 512×512-pixel video with 20 FPS, and the measured performance reaches up to 306.07 GOPS. The ASIC implementation in TSMC 28 nm achieves about 22 FPS in the case of a 720-p video.

关键词： neural network accelerator style transfer neural network deep learning

固氮蓝藻在盐碱化土地生态修复中应用的研究进展

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土壤 2008年第4期40卷 510-516页

作者：张巍冯玉杰哈尔滨工业大学城市水资源与水环境国家重点实验室哈尔滨150090

介绍了固N蓝藻细胞的结构和主要功能:固N蓝藻细胞中含有的叶绿素a能够进行产氧型光合作用;其异形细胞(heterocyst)是进行固N的场所;细胞能分泌胞外多糖(EPS),EPS为多聚阴离子大分子,可与阳离子相互作用,它对Na+的吸附能影响外环境pH改... 详细信息

介绍了固N蓝藻细胞的结构和主要功能:固N蓝藻细胞中含有的叶绿素a能够进行产氧型光合作用;其异形细胞(heterocyst)是进行固N的场所;细胞能分泌胞外多糖(EPS),EPS为多聚阴离子大分子,可与阳离子相互作用,它对Na+的吸附能影响外环境pH改变。从4个方面分析了固N蓝藻的耐盐机理:Na+/H+和Na+/H+-K+反向载体系统可以不断地将胞内Na+排出胞外;在盐胁迫情况下可以合成酸性化合物,从而降低土壤的pH值;积累或产生一些相溶性物质,维持细胞内外渗透压平衡;结合N的存在可以阻止过量Na+的积累,从而提高蓝细菌的耐盐性等。详细介绍了国内外固N蓝藻在盐碱土生态恢复中的研究进展,分析了固N蓝藻在盐碱地改良中的优势及应用潜力以及蓝藻生物菌肥的研究与应用。

关键词：固氮蓝藻盐碱土生态修复耐盐机理

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Occurrence and Removal Efficiencies of Eight Endocrine Disrupting Compounds in a Sewage Treatment Plant

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Occurrence and Removal Efficiencies of Eight Endocrine Disru...