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Methane and nitrous oxide emissions from a subtropical coastal embayment(Moreton Bay, Australia)

Journal of Environmental Sciences 2015年第3期27卷 82-96页

作者： Ronald S.Musenze Ursula Werner Alistair Grinham James Udy zhiguo yuan Advanced Water Management Centre (AWMC) The University of Queensland Department of Civil and Environmental Engineering College of Engineering Design Arts and Technology Makerere University School of Civil Engineering The University of Queensland Healthy Waterways Ltd.

Surface water methane （CH4） and nitrous oxide （N20） concentrations and fluxes were investigated in two subtropical coastal embayments （Bramble Bay and Deception Bay, which are part of the greater Moreton Bay, Australia）. Measurements were done at 23 stations in seven campaigns covering different seasons during 2010-2012. Water-air fluxes were estimated using the Thin Boundary Layer approach with a combination of wind and currents-based models for the estimation of the gas transfer velocities. The two bays were strong sources of both CH4 and N2O with no significant differences in the degree of saturation of both gases between them during all measurement campaigns. Both CH4 and N2O concentrations had strong temporal but minimal spatial variability in both bays. During the seven seasons, CH4 varied between 500% and 4000% saturation while N2O varied between 128 and 255% in the two bays. Average seasonal CH4 fluxes for the two bays varied between 0.5 ± 0.2 and 6.0 ± 1.5 mg CH4/（m^***） while N20 varied between 0.4 ± 0.1 and 1.6 ± 0.6 mg N2O/（m^2-day）. Weighted emissions （t CO2-e） were 63%-90% N2O dominated implying that a reduction in N2O inputs and/or nitrogen availability in the bays may significantly reduce the bays＇ greenhouse gas （GHG） budget. Emissions data for tropical and subtropical systems is still scarce. This work found subtropical bays to be significant aquatic sources of both CH4 and N2O and puts the estimated fluxes into the global context with measurements done from other climatic regions.

关键词： Greenhouse gas emissions Subtropical aquatic systems Bay Methane Nitrous oxide Uncertainty

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Characterization of decellularized scaffold derived from porcine meniscus for tissue engineering applications

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Frontiers of Materials Science 2016年第2期10卷 101-112页

作者： Shuang GAO zhiguo yuan Tingfei XI Xiaojuan WEI Quanyi GUO Center for Biomaterial and Tissue Engineering Academy for Advanced Interdisciplinary Studies Peking University Beijing 100871 China Key Laboratory of PLA Institute of Orthopaedics Chinese PLA General Hospital Beijing 100853 China Department of Materials Science and Engineering College of Engineering Peking University Beijing 100871 China

Menisci are fundamental fibrocartilaginous organs in knee joints. The injury in meniscus can impair normal knee function and predisposes patients to osteoarthritis. This study prepared decellularized meniscus scaffolds using a 1% （w/w） sodium dodecyl sulfate solution and sufficient rinsing steps. Complete cell removal was verified by hematoxylin and eosin staining and DNA content assay. Decellularized menisci had accordant tension properties to intact ones, but with declined compression properties. This occurred because the collagen fiber was not damaged but glycosami- noglycans was significantly lost during the decellularization process, which was confirmed by biochemical assay and histology staining. In vitro cytotoxicity assay demonstrated that decellularized meniscus scaffolds have no toxicity on L929 murine fibroblasts and porcine chondrocytes. Further experiment showed that porcine chondrocytes could adhere and proliferate on the scaffold surface, and some cells even could infiltrate into the scaffold. All results showed the potential of this decellularized meniscus to be the scaffolds in tissue engineering.

关键词： meniscus scaffold decellularization biomechanical cytotoxicity tissueengineering

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Anoxic phosphorus removal in a pilot scale anaerobic-anoxic oxidation ditch process

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Frontiers of Environmental Science & Engineering 2009年第1期3卷 106-111页

作者： Hongxun HOU Shuying WANG Yongzhen PENG zhiguo yuan Fangfang YIN Wang GAN College of Environmental and Energy Engineering Beijing University of TechnologyBeijing 100022China Anhui Guozhen Environmental Protection Science and Technology Co. Ltd.Hefei 230088China Advanced Wastewater Management Centre(AWMC) The University of QueenslandSt LuciaBrisbaneQld 4072Australia

The anaerobic-anoxic oxidation ditch(A^(2)/O OD)process is popularly used to eliminate nutrients from domestic *** order to identify the existence of denitrifying phosphorus removing bacteria(DPB),evaluate the contribution of DPB to biological nutrient removal,and enhance the denitrifying phosphorus removal in the A^(2)/O OD process,a pilot-scale A^(2)/O OD plant(375 L)was *** the same time batch tests using sequence batch reactors(12 L and 4 L)were operated to reveal the significance of anoxic phosphorus *** results indicated that:The average removal efficiency of COD,NH^(+)_(4),PO^(3–)_(4),and TN were 88.2%,92.6%,87.8%,and 73.1%,respectively,when the steady state of the pilotscale A^(2)/O OD plant was reached during 31–73 d,demonstrating a good denitrifying phosphorus removal *** uptake took place in the anoxic zone by poly-phosphorus accumulating organisms NO^(-)_(2) could be used as electron receptors in denitrifying phosphorus removal,and the phosphorus uptake rate with NO^(-)_(2) as the electron receptor was higher than that with NO^(–)_(3) when the initial concentration of either NO^(-)_(2) or NO^(–)_(3) was 40 mg/L.

关键词： wastewater treatment anaerobic-anoxic(A^(2)/O) oxidation ditch(OD) biological phosphorus removal denitrifying phosphorus removal

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Effects of Airflow Field on Droplets Diameter inside the Corrugated Packing of a Rotating Packed Bed

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China Petroleum Processing & Petrochemical Technology 2014年第4期16卷 38-46页

作者： Xu Chengcheng Jiao Weizhou Liu Youzhi Guo Liang yuan zhiguo Zhang Qiaoling Shanxi Province Key Laboratory of Higee-Oriented Chemical Engineering North University of China

Rotating packing bed(RPB) has a better mixing performance than traditional mixers and shows potential application in the petroleum industry. However, acquisition of information about the mixing process directly through experiments is difficult because of the compact structure and complex multiphase flow pattern in RPB. To study the mixing characteristic, Fluent, the computational fluid dynamics(CFD) software, was used to explore the effect of airflow field on droplet diameter. For conducting calculations, the gas-liquid two-phase flow inside the packing was simulated with the RNG k-ε turbulence model and the Lagrange Discrete Phase Model(DPM), respectively. The numerical calculation results showed that coalescence and breakup of droplets can take place in the gas phase flow inside the packing and can be strengthened with increased rotating speed, thereby leading to the enlargement of the average diameter.

关键词： rotating packed bed computational fluid dynamics gas-liquid flow field diameter mixing

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Advances and prospects in biomimetic multilayered scaffolds for articular cartilage regeneration

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Regenerative Biomaterials 2020年第6期7卷 527-542页

作者： Liwei Fu Zhen Yang Cangjian Gao Hao Li zhiguo yuan Fuxin Wang Xiang Sui Shuyun Liu Quanyi Guo School of Medicine Nankai UniversityNo.94 Weijin RoadNankai DistrictTianjin 300071China Beijing Key Lab of Regenerative Medicine in Orthopedics Key Laboratory of Musculoskeletal Trauma and War Injuries PLAInstitute of OrthopedicsThe First Medical CenterChinese PLA General HospitalNo.28 Fuxing RoadHaidian DistrictBeijing 100853China Department of Bone and Joint Surgery Renji HospitalSchool of MedicineShanghai Jiaotong UniversityNo.160 Pujian RoadPudong New DistrictShanghai 200127China

Due to the sophisticated hierarchical structure and limited reparability of articular cartilage(AC),the ideal regeneration of AC defects has been a major challenge in the field of regenerative *** defects progress,they often extend from the cartilage layer to the subchondral bone and ultimately lead to *** engineering techniques bring new hope for AC *** meet the regenerative requirements of the heterogeneous and layered structure of native AC tissue,a substantial number of multilayered biomimetic scaffolds have been *** multilayered scaffolds should generate zone-specific functional tissue similar to native AC *** review focuses on the current status of multilayered scaffolds developed for AC defect repair,including design strategies based on the degree of defect severity and the zone-specific characteristics of AC tissue,the selection and composition of biomaterials,and techniques for design and *** challenges and future perspectives of biomimetic multilayered scaffold strategies for AC regeneration are also discussed.

关键词： biomimetic multilayered scaffold articular cartilage regeneration tissue engineering osteochondral

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Uniformity Control of Scanned Beam in 300 MeV Proton and Heavy Ion Accelerator Complex at SESRI

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原子能科学技术 2024年第4期58卷 705-713页

作者： HOU Lingxiao yuan Youjin SHEN Guodong RUAN Shuang LIU Jie ZHU Yunpeng WANG Geng GUO Hongliang LYU Mingbang GAO Daqing XU zhiguo SHENG Lina YANG Jiancheng Institute of Modern Physics Chinese Academy of SciencesLanzhou 730000China University of Chinese Academy of Sciences Beijing 100049China

In recent years,heavy ion accelerator technology has been rapidly developing worldwide and widely applied in the fields of space radiation simulation and particle ***,a very high uniformity in the irradiation area is required for the extracted ion beams,which is crucial because it directly affects the experimental precision and therapeutic ***,ultra-large-area and high-uniformity scanning are crucial requirements for spacecraft radiation effects assessment and serve as core specification for beamline terminal *** the 300 MeV proton and heavy ion accelerator complex at the Space Environment Simulation and Research Infrastructure(SESRI),proton and heavy ion beams will be accelerated and ultimately delivered to three irradiation *** order to achieve the required large irradiation area of 320 mm×320 mm,horizontal and vertical scanning magnets are used in the extraction beam ***,considering the various requirements for beam species and energies,the tracking accuracy of power supplies(PSs),the eddy current effect of scanning magnets,and the fluctuation of ion bunch structure will reduce the irradiation *** mitigate these effects,a beam uniformity optimization method based on the measured beam distribution was proposed and applied in the accelerator complex at *** the experiment,the uniformity is successfully optimized from 75%to over 90%after five iterations of adjustment to the PS *** this paper,the method and experimental results were introduced.

关键词： heavy ion accelerator beam uniformity scanning magnet MIC

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热轧轧边辊的电气控制系统说明

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有色金属加工 2023年第3期52卷 60-62页

作者：袁志国中色科技股份有限公司河南洛阳471039

介绍了热轧生产中轧边辊的电气控制流程,尤其是自动控制流程,根据控制流程编程可以将轧边辊进行快速、稳定、高效的控制。

关键词：轧边辊自动控制流程快速稳定高效

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轧机物理量的一点标定的实现及应用

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有色金属加工 2023年第4期52卷 63-64页

作者：袁志国中色科技股份有限公司河南洛阳471039

针对工业生产现场常用的物理量两点标定法存在的缺点,提出了一种一点标定物理量的方法,简化了编程,方便了用户操作。

关键词：物理量标定两点标定一点标定

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棋盘井国能蒙西洗煤厂单号三产品重介旋流器故障诊断

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山东煤炭科技 2022年第5期40卷 147-149,152,159页

作者：袁治国神华蒙西煤化工股份有限公司内蒙古鄂尔多斯016100

通过进行筛分和浮沉试验对鄂市国能蒙西洗煤厂的单号三产品重介旋流器进行单机检查。根据检查结果进行可选性分析,各产品产率、入料生成、数量效率和灰分误差以及分配率和错配量的计算,得出鄂市国能蒙西洗煤厂单号三产品重介旋流器分选... 详细信息

通过进行筛分和浮沉试验对鄂市国能蒙西洗煤厂的单号三产品重介旋流器进行单机检查。根据检查结果进行可选性分析,各产品产率、入料生成、数量效率和灰分误差以及分配率和错配量的计算,得出鄂市国能蒙西洗煤厂单号三产品重介旋流器分选效果差,需更换为对现有煤质适应性更好、性能更高的超级旋流器。

关键词：重介旋流器筛分试验浮沉实验

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撞击流-旋转填料床制备纳米CeO_(2)

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中国稀土学报 2022年第4期40卷 616-623页

作者：王丹袁志国刘有智梁雅璐王遇夏赵嘉慧中北大学化学工程技术研究中心超重力化工过程山西省重点实验室山西太原030051

超精密抛光需要粒径均匀的纳米CeO_(2),针对中国绝大多数企业生产的稀土抛光粉难以满足国内对高性能抛光材料需求的问题,采用新型反应器——撞击流-旋转填料床制备纳米CeO_(2),探究了NH_(4)HCO_(3)浓度、沉淀温度、液体流量、超重力因... 详细信息

超精密抛光需要粒径均匀的纳米CeO_(2),针对中国绝大多数企业生产的稀土抛光粉难以满足国内对高性能抛光材料需求的问题,采用新型反应器——撞击流-旋转填料床制备纳米CeO_(2),探究了NH_(4)HCO_(3)浓度、沉淀温度、液体流量、超重力因子、陈化温度及陈化时间对纳米CeO_(2)粒径和形貌的影响。实验结果表明,NH_(4)HCO_(3)浓度越低,纳米CeO_(2)粒径越小,随着沉淀温度、液体流量、超重力因子、陈化温度、陈化时间、煅烧温度和煅烧时间的增加,纳米CeO_(2)粒径先减小后增大。NH_(4)HCO_(3)浓度50 g·L^(-1),沉淀温度90℃,液体流量20 L·h^(-1),超重力因子92,陈化温度30℃,陈化时间1 h,煅烧温度650℃,煅烧时间1.5 h,制备出的纳米CeO_(2)为球形,平均粒径为68 nm,晶粒大小为12 nm,粒度均匀,达到超精密抛光应用要求。

关键词：撞击流-旋转填料床纳米CeO_(2) 抛光粉超重力稀土

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