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Population dynamics and Key Influencing Factors of Microthrix parvicella Caused Sludge Bulking

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Huanjing Kexue/Environmental Science 2024年第11期45卷 6766-6774页

作者： Su G.-X. Qi R. Xiao S.-M. dou d.-C. Guo Y.-X. Gao j. Tianjin Key Laboratory of Aquatic Science and Technology School of Environmental and Municipal Engineering Tianjin Chengjian University Tianjin 300384 China State Key Laboratory of Environmental Aquatic Chemistry Research Center for Eco-Environmental Sciences Chinese Academy of Sciences Beijing 100085 China

Given the frequent occurrence of the sludge bulking phenomena caused by Microthrix parvicella（M. parvicella）overgrowth during the low-temperature period in the full-scale municipal wastewater treatment plant，the filamentous bacteria dynamics of the M. parvicella population were systematically investigated during the completed bulking period using the multi-dimensional integrated filamentous monitoring method combined with the molecular quantitative method. A lab-scale reactor was constructed and successfully simulated bulking phenomena under the low-temperature condition. The trend of dominant filamentous bacterial shift and the main influencing parameters were estimated during the bulking period，to verify the key factors for filament growth and extinction of the sludge bulking phenomenon in the full-scale plant. The results showed that the bulking-caused M. parvicella was characterized by significant changes in the diversity of filamentous bacteria，and the dominant filamentous bacterial succession was reflected in the competition between the skeleton filamentous bacteria Type 0092 and Type 0041 and M. parvicella. At lower temperatures，sludge loading was an important controlling factor for the competitive growth advantage of M. parvicella：when the temperature was lower（approximately 15°C），low sludge loading［0.05 kg·（kg·d）−1］could lead to the stabilized elevation of M. parvicella，and with the loading increased to 0.1 kg·（kg·d）−1 or more，M. parvicella populations showed a targeted decline despite the presence of the low temperature factor. © 2024 Science Press. All rights reserved.

关键词： filamentous bacteria Microthrix parvicella population dynamics sludge bulking sludge loading

Numerical analysis of high‑speed railway slab tracks using calibrated and validated 3d time‑domain modelling

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Railway Engineering Science 2024年第1期32卷 36-58页

作者： A.F.Esen O.Laghrouche P.K.Woodward d.Medina‑Pineda Q.Corbisez j.Y.Shih d.P.Connolly Institute for High‑Speed Rail and System Integration University of LeedsLeeds LS29JTUK Institute for Infrastructure and Environment Heriot-Watt UniversityEdinburgh EH144ASUK Alstom Transport Saint‑OuenFrance Birmingham Centre for Railway Research and Education University of BirminghamBirmingham B152TTUK

Concrete slabs are widely used in modern railways to increase the inherent resilient quality of the tracks,provide safe and smooth rides,and reduce the maintenance *** this paper,the elastic performance of a novel slab trackform for high-speed railways is investigated using three-dimensional finite element modelling in *** is then compared to the performance of a ballasted ***,slab and ballasted track models are developed to replicate the full-scale testing of track *** the models are calibrated with the experimental results,the novel slab model is developed and compared against the calibrated slab track *** slab and ballasted track models are then extended to create linear dynamic models,considering the track geodynamics,and simulating train passages at various speeds,for which the Ledsgard documented case was used to validate the *** travelling at low and high speeds are analysed to investigate the track deflections and the wave propagation in the soil,considering the issues associated with critical *** train loading methods are discussed,and the most practical approach is retained and ***,correlations are made between the geotechnical parameters of modern high-speed rail and conventional *** is found that considering the same ground condition,the slab track deflections are considerably smaller than those of the ballasted track at high speeds,while they show similar behaviour at low speeds.

关键词： High-speed railways Slab track New ballastless track Ballasted track Critical speeds Finite element modelling Calibration of numerical models

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麦田里的守望者

Aluminum X-ray mass-ablation rate measurements

作者： (美)j.d. 塞林格

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Matter and Radiation at Extremes 2017年第1期2卷 16-21页

作者： j.L.Kline j.d.Hager Los Alamos National Laboratory Los AlamosNM 87545USA Lockheed-Martin SyracuseNY 13221USA

Measurements of the mass ablation rate of aluminum(Al)have been completed at the Omega Laser *** measurements show that the mass-ablation rate of Al is higher than plastic(CH),comparable to high density carbon(HdC),and lower than *** mass-ablation rate is consistent with predictions using a 1d Lagrangian code,*** results suggest Al capsules have a reasonable ablation pressure even with a higher albedo than beryllium or carbon ablators and further investigation into the viability of Al capsules for ignition should be pursued.

关键词： Inertial confinement fusion ablator Aluminum ablator Aluminum capsule X-ray mass ablation rate Alternate ablator

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弗兰妮塞林格中短篇小说集 1

Comparative analysis of microstructure,mechanical,and corrosion properties of biodegradable Mg-3Y alloy prepared by selective laser melting and spark plasma sintering

丛书名：塞林格中短篇小说集

1988年

作者：（美）j.d.塞林格吕胜译

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journal of Magnesium and Alloys 2024年第4期12卷 1496-1510页

作者： P.Minárik M.Zemková S.Šašek j.d.ttrich M.Knapek F.Lukáˇc d.Koutný j.jaroš R.Král Faculty of Mathematics and Physics Charles UniversityKe Karlovu 5Praha 12116Czech Republic Research Centre University ofŽilinaUniverzitná8215/1Žilina 01026Slovakia Institute of Plasma Physics of the Czech Academy of Sciences Za Slovankou 1782/318200 Praha 8Czech Republic Institute of Machine and Industrial design Brno University of TechnologyTechnická2896/2Brno 61669Czech Republic

This work explored possibilities of biodegradable magnesium alloy Mg-3Y preparation by two modern powder metallurgy techniques–spark plasma sintering(SPS)and selective laser melting(SLM).The powder material was consolidated by both methods utilising optimised parameters,which led to very low porosity(∼0.3%)in the SLM material and unmeasurably low porosity in the SPS *** main aim of the study was the thorough microstructure characterisation and interrelation between the microstructure and the functional properties,such as mechanical strength,deformability,and corrosion *** materials showed comparable strength of∼110 MPa in tension and compression and relatively good deformability of∼9%and∼21%for the SLM and SPS materials,*** corrosion resistance of the SPS material in 0.1 M NaCl solution was superior to the SLM one and comparable to the conventional extruded *** digital image correlation during loading and the cross-section analysis of the corrosion layers revealed that the residual porosity and large strained grains have the dominant negative effect on the functional properties of the SLM *** the other hand,one of the primary outcomes of this study is that the SPS consolidation method is very effective in the preparation of the W3 biodegradable alloy,resulting in material with convenient mechanical and degradation properties that might find practical applications.

关键词： Magnesium Yttrium Powder metallurgy Microstructure Mechanical strength Corrosion resistance

由超拍电子伏特加速器产生的超高能伽马射线气泡

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Science Bulletin 2024年第4期69卷 449-457页

作者： LHAASO Collaboration Zhen Cao Chuandong Gao Cong Li Ruo-Yu Liu Ruizhi Yang 不详 Key Laboratory of Particle Astrophyics&Experimental Physics division&Computing Center Institute of High Energy PhysicsChinese Academy of SciencesBeijing 100049China University of Chinese Academy of Sciences Beijing 100049China TIANFU Cosmic Ray Research Center ChengduChina Institute of Frontier and Interdisciplinary Science Shandong UniversityQingdao 266237China School of Astronomy and Space Science Nanjing UniversityNanjing 210023China University of Science and Technology of China Hefei 230026China

We report the detection of aγ-ray bubble spanning at least 100deg2 in ultra-high energy(UHE)up to a few PeV in the direction of the star-forming region Cygnus X,implying the presence super PeVatron(s)accelerating protons to at least 10 PeV.A log-parabola form with the photon indexΓ(E)=(2.71±0.02)+(0.11±0.02)×log10(E/10 TeV)is found fitting the gamma-ray energy spectrum of the bubble *** sources,“hot spots”correlated with very massive molecular clouds,and a quasi-spherical amorphousγ-ray emitter with a sharp central brightening are observed in the *** the core of~0.5°,spatially associating with a region containing massive OB association(Cygnus OB2)and a microquasar(Cygnus X-3),as well as previously reported multi-TeV sources,an enhanced concentration of UHEγ-rays is observed with 2 photons at energies above 1 *** general feature of the bubble,the morphology,and the energy spectrum,are reasonably reproduced by the assumption of a particle accelerator in the core,continuously injecting protons into the ambient medium.

关键词： Cosmic rays γ-rays Interstellar medium Star cluster

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免除债务改善援助

国际社会科学杂志（中文版） 2000年第4期17卷 113-121,6页

作者： j.d.冯皮施克在华盛顿哥伦比亚特区的前沿金融国际的总裁

主张免除严重负债国债务的意见正在得势。免除债务有可能制造“道德风险”对贷款资助的发展项目和计划运用业绩标准 ,把不符合标准的项目和计划中止并免除其债务 ,有助于降低这一风险。在较长一段时间内 ,禁止有关援助机构在从免除债务... 详细信息

主张免除严重负债国债务的意见正在得势。免除债务有可能制造“道德风险”对贷款资助的发展项目和计划运用业绩标准 ,把不符合标准的项目和计划中止并免除其债务 ,有助于降低这一风险。在较长一段时间内 ,禁止有关援助机构在从免除债务受益的国家中从事这些以及相类似的项目和计划。

关键词：债务 “道德风险” 业绩标准发展项目援助机构负债贷款中止受益

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印度那加人的历史与现状

世界民族 1991年第4期 63-65页

作者： j.d.帕维加胡光利

属于藏缅语族的那加人在古代印度史上占据重要的地位,公元前印度民间便流行关于这一民族是由两兄弟创造的传说。“那加”一词的梵文含意是蛇、山等等,因此有人认为这一民族的祖先崇拜蛇神,其实从居住在那加兰山地的现代那加人那里已很... 详细信息

属于藏缅语族的那加人在古代印度史上占据重要的地位,公元前印度民间便流行关于这一民族是由两兄弟创造的传说。“那加”一词的梵文含意是蛇、山等等,因此有人认为这一民族的祖先崇拜蛇神,其实从居住在那加兰山地的现代那加人那里已很难找到这种宗教信仰的蛛丝马迹。像其他印度土著人一样,那加人也崇尚湿婆,其原始宗教信仰几与印度教的性力派相同。除此之外,那加人还是万物有灵论者,并笃守“

关键词：加人印度教土著人平原地区原始宗教信仰祖先崇拜英国殖民者民族万物有灵藏缅语族