检索结果-南通市图书馆

Tank-dependence of the functionality and network differentiation of activated sludge community in a full-scale anaerobic/anoxic/aerobic municipal sewage treatment plant

在线全文

学校读者我要写书评

暂无评论

Frontiers of Environmental Science & Engineering 2023年第3期17卷 107-120页

作者： Hongcan Cui Ronghua Xu zhong Yu Yuanyuan yao Shaoqing zhang Fangang Meng School of Environmental Science and Engineering Sun Yat-sen UniversityGuangzhou 510275China Guangdong Provincial Key Laboratory of Environmental Pollution Control and Remediation Technology Sun Yat-sen UniversityGuangzhou 510275China

Understanding the structures and dynamics of bacterial communities in activated sludge(AS)in full-scale wastewater treatment plants(WWTPs)is of both engineering and ecological *** investigations have mainly focused on the AS communities of WWTP aeration tanks,and the differences and interactions between the communities in anaerobic and anoxic tanks of the AS system remain poorly ***,we investigated the structures of bacterial communities and their inter-connections in three tanks(anaerobic,anoxic,and aerobic)and influent from a full-scale WWTP with conventional anaerobic/anoxic/aerobic(A/A/O)process over a year to explore their functionality and network ***-throughput sequencing showed that community compositions did not differ appreciably between the different tanks,likely due to the continuous sludge community interchange between ***,network analysis showed significant differences in inter-species relationships,OTU topological roles,and keystone populations in the different AS ***,the anoxic network is expected to be more unstable and easily affected by environmental ***-associated environmental factors,including dissolved oxygen,pH,and nutrients,were found to affect the relative abundance of functional genera(i.e.,AOB,NOB,PAOs,and denitrifiers),suggesting that these groups were more susceptible to environmental variables than other ***,this work could assist in improving our understanding of tank-associated microbial ecology,particularly the response of functional bacteria to seasonal variations in WWTPs employing A/A/O process.

关键词： Activated sludge Bacterial community Tank-dependence Network association Functional bacteria

Constructing a Z-scheme Fe-MOF-based heterostructure for visible-light-driven oxidation of aromatic alcohol in ambient air

在线全文

学校读者我要写书评

暂无评论

Journal of Materials Science & Technology 2023年第7期138卷 214-220页

作者： Lu zhang Jianhao Qiu Guanglu Xia Dingliang Dai Xiang zhong Jianfeng yao Jiangsu Co-Innovation Center of Efficient Processing and Utilization of Forest Resources College of Chemical EngineeringNanjing Forestry UniversityNanjing 210037China

Photocatalytic oxidation of aromatic alcohol into aromatic aldehyde using O_(2)has received huge atten-tion,while the reaction that occurred in ambient air is rarely studied but follows the green-chemistry ***,spindle-shaped MIL-53(Fe)-NH_(2)@ZnIn_(2)S_(4)photocatalysts with a Z-scheme heterostruc-ture were facilely developed for photocatalytic oxidation of aromatic alcohol in air under visible *** benzyl alcohol conversion can be notably enhanced to 73%over the optimal MIL-53-NH_(2)@ZnIn_(2)S_(4)sample with a benzaldehyde production rate of 1825μmol g^(-1)h^(-1).However,in the O_(2)atmosphere,the benzyl alcohol conversion is only 56%,indicating that O_(2)is not required and has an adverse effect on the *** hierarchical structure and Z-scheme heterojunction of MIL-53-NH_(2)@ZnIn_(2)S_(4)impart an efficient separation and strong redox abilities of photo-induced electrons and holes,which are respon-sible for the impressive photocatalytic *** study could motivate the ingenious design of Z-scheme heterostructures for green organic conversion based on MOFs.

关键词： Photocatalysis Metal-organic frameworks Z-scheme heterostructure Aromatic alcohol oxidation

Synergistically enhanced ORR and HER performance on Co-N-C coupled in-situ generated PtCo intermetallic

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Energy Chemistry 2025年第1期100卷 721-729页

作者： Guanyu Luo Min Song Lulu An Xiao Huang Qian zhang Chenhao zhang Tao Shen Shuang Wang Deli Wang Key Laboratory of Material Chemistry for Energy Conversion and Storage (Huazhong University of Science and Technology) Ministry of Education School of Chemistry and Chemical Engineering Huazhong University of Science and Technology

Integrating multi-scale sites in a composite catalyst is vital to realize efficient ***,a synergistic composite catalyst consisting of Co atomic sites and in-situ generated PtCo intermetallic compounds （IMCs）(o-PtCo@CoNC) is proposed through Co pre-anchoring and subsequent impregnation-reduction *** loading of Co atoms provides a chance for in-situ generating PtCo ordered intermetallic *** remaining Co single atoms and PtCo IMCs construct synergistic electrocatalytic *** from the ordered structure,synergistic effect of Pt Co IMCs and Co single atoms,o-PtCo@CoNC exhibits excellent electrocatalytic performance for oxygen reduction reaction （ORR） and hydrogen evolution reaction （HER） with mass activity of 1.21 A mgPt-1（at 0.9 V） and5.70 A mgPt-1（at an overpotential of 100 mV）,***,o-PtCo@CoNC delivers negligible loss of half-wave potential and overpotential during long-term stability test in acid solutions,with 13 mV decay after 50,000 potential cycles for ORR and a 2.7 mV decay after 20,000 potential cycles for *** integration strategy of single-atomic sites coupled IMCs paves the way for enhancing the activity and durability of Pt-based electrocatalysts.

关键词： Electrolytic reduction

Mean Activity Coefficients of KCI in the KCI-K2B4O7-H2O Ternary System at 308.15 K by EMF Method

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Chemical Research in Chinese Universities 2013年第6期29卷 1189-1192页

作者： zhong Si-yao SANG Shi-hua zhang Jun-jie College of Materials and Chemistry & Chemical Engineering Chengdu University of Technology Chengdu 610059 P.R.China State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation Chengdu University of Technology Chengdu 610059 P.R.China Mineral Resources Chemistry Key Laboratory of Sichuan Higher Education Institutions Chengdu University of Technology Chengdu 610059 P.R.China

The mean activity coefficients of KCI in a KCI-K2B407-H20 ternary system were experimentally determined at 308.15 K by the electromotive force measurement（EMF） via a battery cell without a liquid junction： K-ISEIKCI（m1）, K2B4O7（m2）ICI-ISE（ISE=ion selective electrode） in a total ionic strength of from 0.01 mol/kg to 1.00 mol/kg at different ionic strength fractions of KzB407 with yB=0, 0.200, 0.400, 0.600 and 0.800. K-ISE and CI-ISE presented a good Nernst effect, which implies that this method could be used to measure the activity coefficients of an electrolyte in the above system. The Harned rule was fitted to the experimental data, the Harned coefficients and the Pitzer single-salt ion parameters of KC1 were evaluated, and the relationship diagrams between the mean activity coefficient of KC1 and the ionic strength fraction（yB） were drawn. The mean activity coefficients of KCI（γ±KCI） decreased monotonically with the increase of I. The experimental results obeyed the Harned rule well.

关键词： Activity coefficient Electromotive force measurement Ion selective electrode Potassium chloride Potassium borate

Effects of helium on irradiation-induced phase instability in a NiCrFeTiNbAl alloy

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Tungsten 2021年第1期3卷 58-64页

作者： He zhang zhong-Wen yao Marquis A.Kirk Department of Mechanical and Materials Engineering Queen’s UniversityKingston K7L 3N6Canada Material Science Division Argonne National LaboratoryArgonneIL 60439USA

The Ni–Fe–Cr based superalloy with percentage additions of Nb,Al and Ti,called"Inconel X750 superalloy",is studied with its importance in nuclear *** reactor neutron irradiation,the strengthening phase Ni3(Al,Ti)in the form of gamma prime precipitates were somehow disordered,and dissolved eventually,by which the mechanical properties of materials were *** is of high interests to investigate the e ects of transmutation production helium on radiationinduced instability of gamma prime in the *** transmission electron microscope in situ heavy ion irradiations with and without pre-injected helium are performed *** precipitates were disordered by heavy ion irradiation after 0.06 displacement per atom(dpa).The presence of 2×10-4 atoms helium delayed the disordering of Ni3(Al,Ti)precipitates to 0.68 *** 4×10-4 atoms helium,the precipitates required doses of>2.7 dpa to become *** addition,the precipitation of M23C6 particles were observed at 600℃irradiation to 5.4 dpa with 4×10-4 atoms helium pre-injected.

关键词： γ’Precipitates Disordering Inconel X-750 Helium pre-injection

Stability Analysis of Landfills Contained by Retaining Walls Using Continuous Stress Method

在线全文

学校读者我要写书评

暂无评论

Computer Modeling in Engineering & Sciences 2023年第1期134卷 357-381页

作者： Yufang zhang Yingfa Lu yao zhong Jian Li Dongze Liu China Academy of Railway Sciences Corporation Limited Beijing100081China School of Civil Architecture and EnvironmentHubei University of TechnologyWuhan430068China

An analytical method for determining the stresses and deformations of landfills contained by retaining walls is proposed in this *** the proposedmethod,the sliding resisting normal and tangential stresses of the retaining wall and the stress field of the sliding body are obtained considering the differential stress equilibrium equations,boundary conditions,and macroscopic forces and moments applied to the system,assuming continuous stresses at the interface between the sliding body and the retaining *** solutions to determine stresses and deformations of landfills contained by retaining walls are obtained using the Duncan-Chang and Hooke constitutive models.A case study of a landfill in the Hubei Province in China is used to validate the proposed *** theoretical stress results for a slope with a retaining wall are compared with FEMresults,and the proposed theoreticalmethod is found appropriate for calculating the stress field of a slope with a retaining wall.

关键词： Stress distribution strain distribution landfill retaining wall numerical analysis

Satellite remote sensing reveals overwhelming recovery of forest from disturbances in Asia

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Atmospheric and Oceanic Science Letters 2025年第1期18卷 46-51页

作者： Yiying Zhu Hesong Wang Anzhi zhang School of Ecology and Nature Conservation Beijing Forestry UniversityBeijingChina Key Laboratory of Regional Climate and Environment for Temperate East Asia Institute of Atmospheric PhysicsChinese Academy of SciencesBeijingChina College of Forestry and Landscape Architecture Xinjiang Agricultural UniversityUrumqiChina

Forest ecosystems play key roles in mitigating human-induced climate change through enhanced carbon uptake;however,frequently occurring climate extremes and human activities have considerably threatened the stability of *** the same time,detailed accounts of disturbances and forest responses are not yet well quantified in *** study employed the Breaks For Additive Seasonal and Trend method-an abrupt-change detection method-to analyze the Enhanced Vegetation Index time series in East Asia,South Asia,and Southeast *** approach allowed us to detect forest disturbance and quantify the resilience after *** showed that 20%of forests experienced disturbance with an increasing trend from 2000 to 2022,and Southeast Asian countries were more severely affected by ***,95%of forests had robust resilience and could recover from disturbance within a few *** resilience of forests suffering from greater magnitude of disturbance tended to be stronger than forests with lower disturbance *** summary,this study investigated the resilience of forests across the low and middle latitudes of Asia over the past two *** authors found that most forests exhibited good resilience after disturbance and about two-thirds had recovered to a better state in *** findings of this study underscore the complex relationship between disturbance and resilience,contributing to comprehension of forest resilience through satellite remote sensing.

关键词： Forest ecosystem Enhanced vegetation index Breaks for additive seasonal and trend method Disturbance Resilience

不同加载速度下巴厘菠萝果皮穿刺力学特性研究

在线全文

学校读者我要写书评

暂无评论

农机化研究 2025年第3期47卷 169-175页

作者：薛忠潘睿张秀梅中国热带农业科学院南亚热带作物研究所广东湛江524091 中国热带农业科学院农业机械研究所广东湛江524091 农业农村部热带果树生物学重点实验室广东湛江524091

对菠萝果皮穿刺力学特性进行研究,旨在为果实品质评价提供参考,为菠萝采收、加工设备优化改进提供参考,为减轻菠萝果损伤提供理论依据。以巴厘菠萝果皮为研究对象,根据菠萝生长规律将果皮划分为上、中、下3个部位,基于WSW-50E微机控制... 详细信息

对菠萝果皮穿刺力学特性进行研究,旨在为果实品质评价提供参考,为菠萝采收、加工设备优化改进提供参考,为减轻菠萝果损伤提供理论依据。以巴厘菠萝果皮为研究对象,根据菠萝生长规律将果皮划分为上、中、下3个部位,基于WSW-50E微机控制电子万能试验机,选取2、5、10、20、50 mm/min等5个加载速度对菠萝不同部位进行穿刺力学特性试验,分析不同加载速度、不同穿刺部位和不同穿刺压头截面对果皮穿刺强度的影响。试验结果表明:果皮中部穿刺强度最低,下部穿刺强度最高;压头截面与不同穿刺部位对果皮穿刺强度均呈现负相关极显著(p<0.01),不同穿刺部位对果皮穿刺强度均呈现正相关极显著(p<0.01),压头截面与穿刺部位对穿刺强度影响极显著(p<0.01)。由此得出结论:果皮穿刺强度与压头截面、穿刺部位呈极显著相关关系,加载速度与穿刺强度呈不相关关系。

关键词：菠萝果皮加载速度压头截面穿刺强度

维普期刊数据库博看期刊

Preparation of silver nanoparticles through the reduction of straw-extracted lignin and its antibacterial hydrogel

在线全文

学校读者我要写书评

暂无评论

International Journal of Minerals,Metallurgy and Materials 2025年第2期32卷 504-514页

作者： Lou zhang Shuo Li Fu Tang Jingkai zhang Yuetong Kang Hean zhang Lidong Li State Key Laboratory for Advanced Metals and Materials School of Materials Science and EngineeringUniversity of Science and Technology BeijingBeijing 100083China

Silver nanoparticles(Ag NPs)have attracted attention in the field of biomaterials due to their excellent antibacterial ***,the reducing and stabilizing agents used for the chemical reduction of Ag NPs are usually toxic and may cause water *** this work,Ag NPs(31.2 nm in diameter)were prepared using the extract of straw,an agricultural waste,as the reducing and stabilizing *** analysis revealed that the straw extract contained lignin,the structure of which possesses phenolic hydroxyl and methoxy groups that facilitate the reduction of silver salts into Ag *** surfaces of Ag NPs were negatively charged due to the encapsulation of a thin layer of lignin molecules that prevented their *** the prepared Ag NPs were added to the precursor solution of acrylamide,free radical polymerization was triggered without the need for extra heating or light irradiation,resulting in the rapid formation of an Ag NP-polyacrylamide composite *** inhibition zone test proved that the composite hydrogel possessed excellent antibacterial ability due to the presence of Ag *** prepared hydrogel may have potential applications in the fabrication of biomedical materials,such as antibacterial dressings.

关键词： silver nanoparticles hydrogel straw extraction antibacterial