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Amino-functionalized core-shell magnetic mesoporous composite microspheres for Pb(Ⅱ) and Cd(Ⅱ) removal

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Journal of Environmental Sciences 2013年第4期25卷 830-837页

作者： Yulin Tang Song Liang juntao wang Shuili Yu Yilong wang State Key Laboratory of Pollution Control and Resource Reuse College of Environmental Science & EngineeringTongji University The Institute for Biomedical Engineering & Nano Science Tongji University

Amino-functionalized Fe3O4@mesoporous SiO/ core-shell composite microspheres NH2-MS in created in multiple synthesis steps have been investigated for Pb（Ⅱ） and Cd（Ⅱ） adsorption. The microspheres were characterized by transmission electron microscope （TEM）, scanning electron microscope （SEM）, N2 adsorption-desorption, zeta potential measurements and vibrating sample magnetometer. Batch adsorption tests indicated that NH2-MS exhibited higher adsorption affinity toward Pb（Ⅱ） and Cd（Ⅱ） than MS did. The Langmuir model could fit the adsorption isotherm very well with maximum adsorption capacity of 128.21 and 51.81 mg/g for Pb（Ⅱ） and Cd（Ⅱ）, respectively, implying that adsorption processes involved monolayer adsorption. Pb（Ⅱ） and Cd（Ⅱ） adsorption could be well described by the pseudo second-order kinetics model, and was found to be strongly dependent on pH and humic acid. The Pb（Ⅱ）- and Cd（Ⅱ）-loaded microspheres were effectively desorbed using 0.01 mol/L HC1 or EDTA solution. NH2-MS have promise for use as adsorbents in the removal of Pb（Ⅱ） and Cd（Ⅱ） in wastewater treatment processes.

关键词： heavy metals adsorption magnetic mesoporous microspheres amino-functionalization

Fatigue Behavior of a Dissimilar Aluminum Alloy Welding Joint With and Without Natural Defect

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Journal of Wuhan University of Technology(Materials Science) 2022年第5期37卷 1000-1008页

作者： SHI Liang wang Chiquan LIU Zhiyi wang juntao wang Wukun China Aero-Polytechnology Establishment Beijing100028China Kunming Precision Machinery Research Institute Kunming650118China

In order to investigate the influence of natural defect on the fatigue behavior of 5A06/7A05 dissimilar aluminum alloys welding joint,fatigue tests of two types of specimens with and without defects were carried out systematically under stress amplitude control conditions (stress ratio R=0.1) at normal temperature in laboratory air ***,a new parameter,i e,fatigue defect effect factor (FDEF) was introduced to assess the effect of defect on fatigue *** fatigue failure analysis was conducted as well to compare the fatigue and fracture behavior of the two types of *** results show that:(1) natural defects have a strong effect on the fatigue lives of welding joint,and the differences between the specimens with and without defects can reach 80 times under a same theoretical net sectional stress;(2) the FDEF parameter introduced is effective to deal with the defect effect,and the FDEF decreases along with the increase of fatigue *** mean relative error between the experimental data and predicted fatigue strength based on the FDEF is 10.2%;(3) the macro fracture of both types of specimens have three typical zones,i e,fatigue source zone,crack propagation zone and final fracture zone,while there are more than one fatigue sources for specimens with natural *** overall pattern of crack propagation zone and fracture zone are quite similar,but the morphologies are different in details.

关键词： aluminum alloys welding joint natural defect fatigue life scanning electron microscope(SEM)

Late Paleozoic reefs and their significance for tectonics and oil-gas exploration in the Hinggan-Inner Mongolia area

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Science China Earth Sciences 2011年第2期54卷 212-222页

作者： TIAN ShuGang ZHANG YongSheng wang juntao NIU ShaoWu Institute of Geology Chinese Academy of Geological Sciences Beijing 100037 China Institute of Mineral Resources Chinese Academy of Geological Sciences Beijing 100037 China Tianjin Institute of Geology and Mineral Resources China Geological Survey Tianjin 300170 China

Many reefs of the Late Paleozoic have been discovered recently in the Hinggan-lnner Mongolia area. These reefs clearly are geographically extensive, and possess distinctive features and well-developed reef-facies. They have been found to contain five reef-building communities and were constructed in four periods. Colonial coral-algal reefs at Aohan and Chifeng represent a warm shallow-sea in the Carboniferous. Different reefs in the Xiwu Banner were formed in three periods： early Late Carboniferous, late Late Carboniferous and Early Permian. These reefs were built in warm sea conditions. Their buildup types include colonial coral frameworks, algae-buildings and lime-mud mounds. Bryozoan reefs in the Zhalaite and Dongwu banners were built in the late Middle Permian and thrived in a cold shallow-sea. All reefs grew independently on two kinds of sedimentary platforms, carbonate and carbonate-clastic mixed platforms. Four reef-forming periods occurred later from south to north, along a collisional course between the North China Plate and the Siberian Plate. These reefs can be arranged into three ＇reef-links＇ or reef zones that extend along plate margins. Among these, the Aohan-Chifeng reef-link indicates a northern margin of the North China Plate, the Zhalaite-Dongwu reef-link marks a southern margin of the Siberian Plate, and the Xiwu-Beishan reef-link reflects the former existence of some inter-plates. The strata of each reef-facies are thick and contain rich asphalt deposits. Overlapping and heteropic layers are very thick and contain dark oil/gas-rich horizons; TOC analyses verify that most of these are good hydrocarbon source rocks. This study shows that the study area is an excellent candidate for oil-gas exploration.

关键词： reefs Late Paleozoic Hinggan-Inner Mongolia fold-zone oil-gas exploration

Study on Ti/BDD Film Electrode with Ta Interlayer

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稀有金属材料与工程 2012年第S1期41卷 247-249页

作者： Xin Yonglei Liu Feng wang juntao Li Xiangbo Luoyang Ship Mat Res Inst Sci & Technol Marine Corros & Protect Lab Qingdao 266101 Peoples R China

Boron doped diamond(BDD)thin films have been deposited on Ti substrate with Ta interlayer by MP-CVD(microwave plasma chemical vapor deposition),and Ta interlayer was deposited by magnetron *** physical and electrochemical behaviors of the Ti/Ta/BDD electrode and its application in electrochemical oxidation of wastewater containing 2,4-dichlorophenol were *** spectroscopy and field emission scanning electron microscopy(FESEM)demonstrates that the films obtained exhibit well-defined diamond *** spectroscopy shows no TiC in the BDD film with Ta *** measurement shows the BDD electrode behaves low background current and wide working potential window up to 4 ***,the removal efficiency of chemical oxygen demand(COD)of the BDD electrodes were evaluated by the electrochemical oxidation of 2,4-dichlorophenol.

关键词： microwave plasma chemical vapor deposition boron doped diamond Ta wastewater treatment electrochemical oxidation

Soil pH determines fungal diversity along an elevation gradient in Southwestern China

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Science China(Life Sciences) 2018年第6期61卷 718-726页

作者： Dan Liu Guohua Liu Li Chen juntao wang Limei Zhang State Key Laboratory of Urban and Regional Ecology Research Center for Eco-Environmental Sciences Chinese Academy of Sciences Beijing 100085 China University of Chinese Academy of Sciences Beijing 100049 China Joint Center for Global Change studies Beijing 100875 China

Fungi play important roles in ecosystem processes, and the elevational pattern of fungal diversity is still unclear. Here, we examined the diversity of fungi along a 1,000 m elevation gradient on Mount Nadu, Southwestern China. We used MiSeq sequencing to obtain fungal sequences that were clustered into operational taxonomic units(OTUs) and to measure the fungal composition and diversity. Though the species richness and phylogenetic diversity of the fungal community did not exhibit significant trends with increasing altitude, they were significantly lower at mid-altitudinal sites than at the base. The Bray-Curtis distance clustering also showed that the fungal communities varied significantly with altitude. A distance-based linear model multivariate analysis(DistLM) identified that soil pH dominated the explanatory power of the species richness(23.72%),phylogenetic diversity(24.25%) and beta diversity(28.10%) of the fungal community. Moreover, the species richness and phylogenetic diversity of the fungal community increased linearly with increasing soil pH(P<0.05). Our study provides evidence that pH is an important predictor of soil fungal diversity along elevation gradients in Southwestern China.

关键词： fungi diversity elevation soil pH

Comprehensive emergy evaluation and optimization of corn straw power generation system: a case study

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Chinese Journal of Population,Resources and Environment 2019年第2期17卷 135-144页

作者： Qingsong wang Zhenlei Gao Xueliang Yuan juntao wang Mansen wang School of Energy and Power Engineering Shandong UniversityJinanChina General Office Ecology and Environment Bureau of WeifangWeifangChina Medical Data Research Center Providence Health&ServicesPortlandORUSA

Biomass energy has become an important measure to alleviate ecological environment security and energy supply security in *** accounting method is used to analyze and evaluate economy,environment,and sustainability of corn straw generation system,which includes corn planting subsystem,collection and transportation subsystem,and corn straw power generation *** key substances that need to be optimized in the system are identified by using sensitivity *** on the position of key substances in the system,emergy accounting optimization methodology is *** optimization design scheme is proposed based on the '3R' (reduce,reuse,and recycle) principle of circular *** study shows that emergy yield ratio,emergy investment ratio,environmental loading ratio,and emergy sustainability index of the corn straw power generation system are 3.69,2.68,1.61,and 2.29,respectively,which are better than wind power generation system and thermal power generation *** addition,it is proposed that the fertilizer alternative plan and the transportation redesign plan can replace 50,000 tons potash and reduce equipment resources by 20% and energy resources input by 30%.Economy and sustainable development of the system is significantly *** optimization design method based on the '3R' principle proposed in this paper can provide a useful reference for the research in the field of resource recycling.

关键词： Emergy analysis sensitivity analysis sustainable development resource design

Engineered nitrogen doping on VO_(2)(B)enables fast and reversible zinc-ion storage capability for aqueous zinc-ion batteries

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Journal of Energy Chemistry 2023年第10期85卷 30-38,I0003页

作者： Xin Gu juntao wang Xiaobin Zhao Xin Jin Yuzhe Jiang Pengcheng Dai Nana wang Zhongchao Bai Mengdi Zhang Mingbo Wu College of New Energy State Key Laboratory of Heavy Oil ProcessingChina University of Petroleum(East China)Qingdao 266580ShandongChina Institute for Superconducting and Electronic Materials Australian Institute for Innovative MaterialsUniversity of Wollongong Innovation CampusNorth WollongongNew South Wales 2500Australia Institute of Energy Materials Science(IEMS) University of Shanghai for Science and TechnologyShanghai 200093China

Vanadium-based compounds with high theoretical capacities and relatively stable crystal structures are potential cathodes for aqueous zinc-ion batteries(AZIBs).Nevertheless,their low electronic conductivity and sluggish zinc-ion diffusion kinetics in the crystal lattice are greatly obstructing their practical ***,a general and simple nitrogen doping strategy is proposed to construct nitrogen-doped VO_(2)(B)nanobelts(denoted as VO_(2)-N)by the ammonia heat *** with pure VO_(2)(B),VO_(2)-N shows an expanded lattice,reduced grain size,and disordered structure,which facilitates ion transport,provides additional ion storage sites,and improves structural durability,thus presenting much-enhanced zinc-ion storage *** functional theory calculations demonstrate that nitrogen doping in VO_(2)(B)improves its electronic properties and reduces the zinc-ion diffusion *** optimal VO_(2)-N400 electrode exhibits a high specific capacity of 373.7 mA h g^(-1)after 100 cycles at 0.1 A g^(-1)and stable cycling performance after 2000 cycles at 5 A g^(-1).The zinc-ion storage mechanism of VO_(2)-N is identified as a typical intercalation/de-intercalation process.

关键词： Vanadium dioxide Nitrogen doping Cathode materials Aqueous zinc-ion batteries

Black Box Modeling Method and Its Application in Refractories Techniques

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China's Refractories 2012年第4期21卷 1-6页

作者： wang Jiezeng YUAN Lin YE Yahong LI Penghai wang juntao Ruitai Materials Technology Co. Ltd. Beijing 100024 China

Concept of black box, condition of modeling and control methods were introduced. Taking high purity silica brick as an example, the silica brick featured with high purity, low porosity, low true density and high strength was developed through problem analysis, test design, modeling and optimization. Using information technology to upgrade refractories industry was discussed.

关键词： black box modeling optimization techniques refractories

Myocardial Oxygenation Response to Stress Performing a Single-set Compared to Volume-Matched Multiple-Set of Leg Press in Untrained Young Adults

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Journal of Science in Sport and Exercise 2023年第2期5卷 174-181页

作者： Junhai Xu Arnold G.Nelson James J.Tufano juntao wang School of Kinesiology Louisiana State UniversityBaton RougeLouisianaUSA Faculty of Physical Education and Sport Charles UniversityPragueCzech Republic School of Sport Economic and Management Central University of Finance&EconomicsBeijingP.R.China

Background Debates exist about the preference for single-or multiple-set resistance exercise(RE)on achieving similar training outcome,however,no study examined their effects on the heart,thus,this study was to examine the effect of volume-matched single-and multiple-set RE on the myocardial response through examining rate pressure product(RPP).Methods Fourteen healthy untrained college students performed two leg press exercises(4×10 and 1×40 at 150%body mass)on different days,and each was performed twice in a counterbalanced crossover ***-and post-exercise SBP and HR were measured by auscultatory method,RPP was calculated as SBP×HR×10^(-3),RPP difference(RPPdiff)was calcu-lated by post-exercise RPP subtracting pre-exercise *** Single-set post-exercise RPP(17.48±3.16 mmHg·beats/min),HR(123.86±20.25 beats/min)was significantly greater than multiple-set post-exercise RPP(13.66±3.04 mmHg·beats/min),HR(101.61±19.14 beats/min),*** was no significant difference of SBP(141.07±9.37 vs.134.29±15.16 mmHg)between exercise protocols(P=0.13).The RPPdiff of single-set(6.74±2.86 mmHg·beats/min)was significantly greater than that of multiple-set(3.62±2.90 mmHg·beats/min)(P<0.001).Conclusions Single-set RE exerts a greater myocardial oxygenation response as compared to multiple-set,HR contributed more than SBP to the increase of RPP in *** results indicate that single-set RE can be warranted when wanting to train the heart,while multiple-set RE would appear best for those who should avoid heart stress.

关键词： Myocardial oxygen consumption Rate pressure product Heart rate Systolic blood pressure Resistance exercise