检索结果-南通市图书馆

Bisphenol A removal from synthetic municipal wastewater by a bioreactor coupled with either a forward osmotic membrane or a microfiltration membrane unit

在线全文

学校读者我要写书评

暂无评论

Frontiers of Environmental Science & Engineering 2013年第2期7卷 294-300页

作者： hongtao zhu Wenna LI School of Environmental Science and Engineering Beijing Forestry University Beijing 100083 China Tianjin Guangyao Dongfang Property & Investment Co. Ltd. Tianjin 300450 China

Forward osmotic membrane bioreactor is an emerging technology that combines the advantages of forward osmosis and conventional membrane bioreactor. In this paper, bisphenol A removal by using a forward osmotic membrane bioreactor and a conventional mem- brane bioreactor that shared one biologic reactor was studied. The total removal rate of bisphenol A by the conventional membrane bioreactor and forward osmotic membrane bioreactor was as high as 93.9% and 98%, respectively. Biodegradation plays a dominant role in the total removal of bisphenol A in both processes. In comparison of membrane rejection, the forward osmosis membrane can remove approximately 70% bisphenol A from the feed, much higher than that of the microfiltration membrane （below 10%）. Forward osmosis membrane bioreactor should be operated with its BPA loading rate under 0.08 mg. g-1. d-1 to guarantee the effluent bisphenol A concentration less thanlO μg·L-1.

关键词： forward osmosis membrane bioreactor,bisphenol A microfiltration

Degradation behavior of 17α-ethinylestradiol by ozonation in the synthetic secondary effluent

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 Environmental Sciences 2012年第2期24卷 228-233页

作者： Zheyun Zhang hongtao zhu Xianghua Wen Xiurong Si Environmental Simulation and Pollution Control State Key Joint Laboratory School of Environment Tsinghua University Beijing 100084 China School of Chemical ＆ Environmental Engineering China University of Mining and Technology Beijing 100083 China

Endocrine disrupting chemicals（EDCs） in the secondary effluent discharged from wastewater treatment plants（WWTPs） are of great concern in the process of water *** has been reported as a powerful oxidation technology to eliminate micropollutants in water *** to the complexity of the wastewater matrix,orthogonal experiments and single factor experiments were conducted to study the influence of operational parameters on the degradation of 17α-ethinylestradiol（EE2） in the synthetic secondary *** results of the orthogonal experiments indicated that the initial ozone and natural organic matter（NOM） concentration significantly affected EE2 degradation efficiency,which was further validated by the single factor confirmation ***2 was shown to be effectively degraded by ozonation in the conditions of low pH（6）,NOM（10 mg/L）,carbonate（50 mg/L）,but high suspended solid（20 mg/L） and initial ozone concentration（9 mg/L）.The study firstly revealed that the lower pH resulted in higher degradation of EE2 in the synthetic secondary effluent,which differed from EDCs ozonation behavior in pure ***2 degradation by ozone molecule instead of hydroxyl radical was proposed to play a key role in the degradation of EDCs by ozonation in the secondary *** ratio between O3 and TOC was identified as an appropriate index to assess the degradation of EE2 by ozonation in the synthetic secondary effluent.

关键词： ozonation EE2 pH natural organic matter secondary effluent

Synchronization of two coupled exciters in a vibrating system of spatial motion

在线全文

学校读者我要写书评

暂无评论

Acta Mechanica Sinica 2010年第3期26卷 477-493页

作者： Chunyu Zhao hongtao zhu Yimin Zhang Bangchun Wen School of Mechanical Engineering and Automation Northeastern University 110004 Shenyang China Faculty of Engineering University of Wollongong Wollongong NSW 2522 Australia

The paper proposes an analytical approach to investigate the synchronization of the two coupled exciters in a vibrating system of spatial motion. Introducing the distur- bance parameters for average angular velocity of two excit- ers, we deduce the non-dimensional coupling equations of angular velocities of two exciters, in which the inertia cou- pling matrix is symmetric and the stiffness coupling matrix is antisymmetric in a non-resonant vibrating system. The analysis of the coupling dynamic characteristic shows that the coupled cosine effect of the phase angles will cause the torque acting on two motors to limit the increase of phase difference between two exciters as well as sustain its sym- metry of two exciters during the running process. It physi- cally explains the peculiarity of self-synchronization of two exciters. The cosine effect of phase angles of the vibrations excited by each exciter will decrease its moment of inertia. The residual moment of inertia of each exciter represents its relative moment of inertia. The stability condition of synchro- nization of two exciters is that the relative non-dimensional moments of inertia of two exciters are all greater than zero and four times their product is greater than the square of their coefficient of coupled cosine effect of phase angles, which is equivalent to that the inertia coupling matrix is positive definite and all its elements are positive. The numeric results show that the structure of the vibrating system can ensure the stability condition of synchronous operation.

关键词： Frequency capture - StabilitySynchronization Vibrating system -Vibratory synchronization transmission

Influence of white etching layer on rolling contact behavior at wheel-rail interface

在线全文

学校读者我要写书评

暂无评论

Friction 2020年第6期8卷 1178-1196页

作者： Qinglin LIAN Guanyu DENG hongtao zhu Huijun LI Xi WANG Zhiming LIU School of Mechanical MaterialsMechatronic and Biomedical EngineeringUniversity of WollongongNSW 2522Australia School of Mechanical Electronic and Control EngineeringBeijing Jiaotong UniversityBeijing 100044China

The existence of narrow and brittle white etching layers(WELs)on the rail surface is often linked with the formation of rail defects such as squats and studs,which play the key roles in rail surface degradation and tribological *** the present study,a systematic investigation on stress/strain distribution and fatigue life of the WEL during wheel-rail rolling contact was conducted based on a numerical model considering the realistic wheel *** is the first study considering the influence of rail materials,loading pressure,frictional condition,WEL geometry(a/b),and slip ratio(Sr)in the practical service conditions at the same *** results revealed much higher residual stress in WEL than in rail *** changes along the rail depth matched with the previously reported microstructure *** current work revealed that the maximum difference in contact stress between the wheel passages of rail matrix and the WEL region(noted as stress variation)rises with the increase of loading pressure,the value of a/b,and Sr;but drops with the friction coefficient(μ).In addition,a critical length–depth ratio of 5 for a/b has been *** fatigue parameter,FP,of the WEL decreased quickly with the length–depth ratio when it was less than 5 and then increased slightly when it was larger than *** study also revealed that the fatigue life of the WEL was reduced for high strength head hardened(HH)rail compared with standard carbon(SC)rail.

关键词： wheel-rail contact white etching layer rolling contact fatigue finite element simulation

Potential application of graphene nanoplatelets as a high temperature lubricant for hot rolling

在线全文

学校读者我要写书评

暂无评论

Friction 2022年第11期10卷 1810-1823页

作者： Long WANG Anh Kiet TIEU Ming MA Jiaqing LI Guojuan HAI hongtao zhu State Key Laboratory of Solidification Processing Center of Advanced Lubrication and Seal MaterialsNorthwestern Polytechnical UniversityXi’an 710021China School of Mechanical MaterialsMechatronic and Biomedical EngineeringFaculty of Engineering and Information SciencesUniversity of WollongongNorthfields AvenueWollongongNSW 2522Australia State Key Laboratory of Tribology Department of Mechanical EngineeringTsinghua UniversityBeijing 100084China School of Materials Science and Engineering Shaanxi University of Science and TechnologyXi’an 710021China

Graphene has been shown to be a promising solid lubricant to reduce friction and wear of the sliding counterparts,and currently is reported to only function below 600℃.In this study,its potential as a lubricant above 600℃ was studied using a ball-on-disc tribo-meter and a rolling *** results suggest that a reduction up to 50%can be obtained with graphene nanoplatelets(GnP)under lubricated conditions between 600 and 700℃ when compared with dry *** this friction reduction can last more than 3 *** 800 and 900℃,the friction reduction is stable for 70 and 40 s,respectively,which indicates that GnP can potentially provide an effective lubrication for hot metal forming *** rolling experiments on steel strips indicate that GnP reduces the rolling force by 11%,7.4%,and 6.9%at 795,890,and 960℃,*** friction reductions are attributed to the easily sheared GnP between the rubbing interfaces.A temperature higher than 600℃ will lead to the gasification of the residual graphene on the strip surface,which is believed to reduce the black contamination from traditional graphite lubricant.

关键词： graphene high temperature lubricant hot rolling tribology properties

Experimental study of surface integrity and fatigue life in the face milling of Inconel 718

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

Frontiers of Mechanical Engineering 2018年第2期13卷 243-250页

作者： Xiangyu WANG Chuanzhen HUANG Bin ZOU Guoliang LIU hongtao zhu Jun WANG Centre for Advanced Jet Engineering Technologies (CaJET) School of Mechanical Engineering Shandong University Jinan 250061 China Key-Laboratory of High-efficiency and Clean Mechanical Manufacture (Shandong University) Ministry of Education Jinan 250061 China School of Mechanical and Manufacturing Engineering UNSW Australia Sydney NSW 2052 Australia

The Inconel 718 alloy is widely used in the aerospace and power industries. The machining-induced surface integrity and fatigue life of this material are important factors for consideration due to high reliability and safety requirements. In this work, the milling of Inconel 718 was conducted at different cutting speeds and feed rates. Surface integrity and fatigue life were measured directly. The effects of cutting speed and feed rate on surface integrity and their further influences on fatigue life were analyzed. Within the chosen parameter range, the cutting speed barely affected the surface roughness, whereas the feed rate increased the surface roughness through the ideal residual height. The surface hardness increased as the cutting speed and feed rate increased. Tensile residual stress was observed on the machined surface, which showed improvement with the increasing feed rate. The cutting speed was not an influencing factor on fatigue life, but the feed rate affected fatigue life through the surface roughness. The high surface roughness resulting from the high feed rate could result in a high stress concentration factor and lead to a low fatigue life.

关键词： roughness hardness residual stress microstrucmre fatigue life

A molecular dynamics study on the tribological behavior of molybdenum disulfide with grain boundary defects during scratching processes

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

Friction 2021年第5期9卷 1198-1212页

作者： Boyu WEI Ning KONG Jie ZHANG Hongbo LI Zhenjun HONG hongtao zhu Yuan zhuANG Bo WANG School of Mechanical Engineering University of Science and Technology BeijingBeijing 100083China School of Mechanical Materials&Mechatronics EngineeringUniversity of WollongongWollongongNSW 2522Australia Beijing Institute of Spacecraft System Engineering Beijing 100094China

The effect of grain boundary(GB)defects on the tribological properties of MoS_(2) has been investigated by molecular dynamics(MD)*** GB defects‐containing MoS_(2) during scratching process shows a lower critical breaking load than that of indentation process,owing to the combined effect of pushing and interlocking actions between the tip and MoS_(2) *** wear resistance of MoS_(2) with GB defects is relevant to the misorientation angle due to the accumulation of long Mo-S bonds around the *** the adhesion strength between the MoS_(2) and substrate is an efficient way to improve the wear resistance of MoS_(2) with low‐angle GBs.

关键词： MoS_(2) grain boundary tribological behavior molecular dynamics misorientation angle

Recognition and Prediction of Source Rocks of the Madingo Formation in the Lower Congo Basin

在线全文

学校读者我要写书评

暂无评论

Journal of Earth Science 2023年第1期34卷 232-241页

作者： Youran Yang Xianghua Yang Wanzhong Shi hongtao zhu Wei Wang Hongquan Kang Linan Pang Key Laboratory of Tectonics and Petroleum Resources of Ministry of Education China University of GeosciencesWuhan430074China Faculty of Earth Resources China University of GeosciencesWuhan430074China China National Offshore Oil Corporation Research Institute Beijing100027China

We investigated the petrological and seismic properties of Madingo Formation, the highquality source rocks in the Madingo Formation in the Lower Congo Basin are highly heterogeneous. Due to little drilling and oil-based mud pollution, samples that are able to be used to measure the TOC(total organic carbon) content of source rock in the Madingo Formation are few and unevenly distributed;hence, it is difficult to carry out their quantitative evaluation. We investigated the petrological and seismic properties of Madingo Formation between TOC and well logging parameters including density, natural gamma, and acoustic time difference via multiple regression analysis. The TOC data volume is calculated using a neural network model between the predicted TOC content and seismic attributes of the sidetrack. The results of TOC three-dimensional quantitative prediction in the study area show that the source rocks in the Madingo Formation have a strong heterogeneity in the vertical direction, and the plane distribution is low in the northeast and high in the southwest. This study provides suitable tools to predict the complex heterogeneous distribution of source rocks and has great significance for oil exploration in the Lower Congo Basin.

关键词： the Lower Congo Basin petrology source rock prediction Madingo Formation

Effect of high pressure torsion process on the microhardness,microstructure and tribological property of Ti6Al4V alloy

在线全文

学校读者我要写书评

暂无评论

Journal of Materials Science & Technology 2021年第35期94卷 183-195页

作者： Guanyu Deng Xing Zhao Lihong Su Peitang Wei Liang Zhang Lihua Zhan Yan Chong hongtao zhu Nobuhiro Tsuji School of Mechanical MaterialsMechatronic and Biomedical EngineeringUniversity of WollongongNSW 2500Australia Department of Materials Science and Engineering Kyoto UniversityKyoto 606-8501Japan State Key Laboratory of High Performance Complex Manufacturing.Central South University Changsha 4W083China Stare Key Laboratory of Mechanical Transmissions Chongqing UniversityChongqing 400030China International Joint Laboratory for Light Alloys(MOE) College of Materials Science and EngineeringChongqing UniversityChongqing 400044China Department of Materials Science and Engineering University of California BerkeleyCA 94720United States Elements Strategy Initiative for Structural Materials(ESISM) Kyoto UniversityKyoto 606-8501Japan

In the present study,a fully lamellar Ti6Al4V alloy was severely deformed by high pressure torsion(HPT)process under a pressure of 7.5 GPa up to 10 *** results revealed that the microhardness of Ti6Al4V was increased remarkably by about~41%and saturated at about 432 Hv after the HPT process.A relatively uniform bulk nanostructured Ti6Al4V alloy with an average grain size of about52.7 nm was obtained eventually,and no obvious formation of metastableωphase was detected by XRD *** the first time,the tribological properties of the HPT processed Ti6Al4V alloy were investigated by a ball-on-disc test at room temperature under a dry *** was found that HPT process had a great influence on the friction and wear behaviors of Ti6Al4V *** increasing the number of HPT revolutions,both friction coefficient and specific wear rate were obviously decreased due to the reduction of abrasion and adhesion *** being deformed by 10 HPT revolutions,the friction coefficient was reduced from about 0.49 to 0.37,and the specific wear rate was reduced by about 48%.The observations in this study indicated that HPT processed Ti6Al4V alloys had good potential in structural applications owing to their greatly improved mechanical and tribological properties.

关键词： Severe plastic deformation High pressure torsion UFG microstructure Mechanical property Friction and wear Ti6Al4V alloy