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垃圾焚烧飞灰水泥固化体的抗压强度和浸出性研究

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环境工程学报 2016年第6期10卷 3207-3214页

作者：尚宁王海洋吴华南 ko jae hac 徐期勇北京大学深圳研究生院环境与能源学院深圳聚硅酸盐复合环保材料工程实验室深圳518055

利用垃圾焚烧飞灰掺入普通硅酸盐水泥制备水泥固化体,通过浸出性实验,研究了飞灰掺量(0%、20%、40%与60%)、浸出液pH及水洗预处理对水泥固化体抗压强度及重金属(Zn、Pb、Cu、Cd、Cr、Ni)浸出的影响。结果表明:对于非水洗飞灰水泥固化体... 详细信息

利用垃圾焚烧飞灰掺入普通硅酸盐水泥制备水泥固化体,通过浸出性实验,研究了飞灰掺量(0%、20%、40%与60%)、浸出液pH及水洗预处理对水泥固化体抗压强度及重金属(Zn、Pb、Cu、Cd、Cr、Ni)浸出的影响。结果表明:对于非水洗飞灰水泥固化体,pH为4.2和10.0下浸出84 d时,相同组成固化体抗压强度较为接近,飞灰掺量20%,40%和60%的固化体抗压强度分别为41、15和10 MPa左右;除掺量为40%和60%的固化体浸出液中重金属(pH为4.2时Ni和Pb,pH为10.0时Ni)超出生活饮用水卫生标准(GB 5749-2006)外,掺量为40%和60%的固化体的其余浸出液及掺量20%的固化体浸出液中测定的重金属浓度均符合生活饮用水卫生标准。对于水洗飞灰水泥固化体,pH为4.2和10.0下浸出84 d时,相同组成固化体抗压强度较为接近,飞灰掺量20%、40%和60%的固化体抗压强度分别为37、32和10 MPa左右;除掺量为60%的固化体浸出液(pH为4.2和10.0)中Ni和Pb均超出生活饮用水卫生标准外,掺量为60%的固化体的其余浸出液及飞灰掺量20%和40%的固化体浸出液中测定的重金属浓度均符合生活饮用水卫生标准。飞灰水洗预处理提高了飞灰掺量40%水泥固化体抗压强度,同时降低了重金属浸出性。

关键词：垃圾焚烧飞灰水洗预处理 pH 长期浸出性抗压强度

模拟生活垃圾填埋反应器堆体底部抽气对污染气体排放的控制

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环境工程学报 2020年第11期14卷 3182-3191页

作者：杜越 ko jae hac 黄丹丹王前向静雅徐期勇北京大学深圳研究生院环境与能源学院深圳518055 济州国立大学海洋科学学院济州岛63243韩国

在填埋作业期间,生活垃圾填埋场由于缺少覆盖材料和集气系统,导致填埋气排放缺乏有效控制。为探究垃圾堆体抽气操作对填埋气的减排作用,搭建了3个模拟反应器,包括不抽气的对照组(C)、低抽气量组(E1)和高抽气量组(E2)。在为期171 d的实验... 详细信息

在填埋作业期间,生活垃圾填埋场由于缺少覆盖材料和集气系统,导致填埋气排放缺乏有效控制。为探究垃圾堆体抽气操作对填埋气的减排作用,搭建了3个模拟反应器,包括不抽气的对照组(C)、低抽气量组(E1)和高抽气量组(E2)。在为期171 d的实验中,垃圾分3层填埋,使用静态通量箱法,探究了3个反应器中二氧化碳、甲烷及含硫恶臭气体(甲硫醇、二硫化碳、甲硫醚、乙硫醚和二甲二硫醚)排放通量随反应器运行时间和垃圾堆体抽气操作强度的变化情况。结果表明:E2组比C组更早产生甲烷,但其抽气后减排率可达100%;而E1一直未检测到甲烷,可能是因为甲烷化过程并未建立,或是其中甲烷被覆土中的甲烷氧化菌氧化。此外,与自身抽气前相比,E1和E2对5种硫化物具有不同程度的减排效果,但E2的效果更好。上述研究结果可为填埋场的温室气体和含硫恶臭气体减排策略的制定提供参考。

关键词：生活垃圾填埋场抽气气体排放控制温室气体含硫气体

SOME LIOUVILLE-TYPE THEOREMS FOR THE STATIONARY 3D MAGNETO-MICROPOLAR FLUIDS

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Acta Mathematica Scientia 2024年第6期44卷 2296-2306页

作者： jae-Myoung KIM Seungchan ko Department of Mathematics Education Andong National University Department of Mathematics Inha University

In this paper,we prove some Liouville-type theorems for the stationary magnetomicropolar fluids under suitable conditions in three space *** first prove that the solutions are trivial under the assumption of certain growth conditions for the mean oscillations of the *** then we show similar results assuming that the solutions are contained in Lp（R3） with p ∈ [2,9/2).Finally,we show the same result for lower values of p ∈ [1,9/4) with the further assumption that the solutions vanish at infinity.

关键词： Liouville-type theorem stationary magneto-micropolar equations

PagMYB128 regulates secondary cell wall formation by direct activation of cell wall biosynthetic genes during wood formation in poplar

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Journal of Integrative Plant Biology 2024年第8期66卷 1658-1674页

作者： Yuanyuan Hao Fachuang Lu Seung-Won Pyo Min-Ha Kim jae-Heung ko Xiaojing Yan John Ralph Quanzi Li State Key Laboratory of Tree Genetics and Breeding Chinese Academy of ForestryBeijing 100091China Department of Biochemistry and DOE Great Lakes Bioenergy Research Center Wisconsin Energy InstituteUniversity of Wisconsin-MadisonWisconsin 53726USA Department of Plant&Environmental New Resources Kyung Hee UniversityYongin 17104Korea

The biosynthesis of cellulose,lignin,and hemicelluloses in plant secondary cell walls(SCWs)is regulated by a hierarchical transcriptional regulatory *** network features orthologous transcription factors shared between poplar and Arabidopsis,highlighting a foundational similarity in their genetic ***,knowledge on the discrepant behavior of the transcriptional-level molecular regulatory mechanisms between poplar and Arabidopsis remains *** this study,we investigated the function of PagMYB128 during wood formation and found it had broader impacts on SCW formation compared to its Arabidopsis ortholog,*** poplar trees overexpressing PagMYB128 exhibited significantly enhanced xylem development,with fiber cells and vessels displaying thicker walls,and an increase in the levels of cellulose,lignin,and hemicelluloses in the *** contrast,plants with dominant repression of PagMYB128 demonstrated the opposite *** sequencing and reverse transcription–quantitative polymerase chain reaction showed that PagMYB128 could activate SCW biosynthetic gene expression,and chromatin immunoprecipitation along with yeast one-hybrid,and effector–reporter assays showed this regulation was *** analysis revealed that PagSND1(SECONDARY WALL-ASSOCIATED NAC-DOMAIN PROTEIN1)directly regulates PagMYB128 but not cell wall metabolic genes,highlighting the pivotal role of PagMYB128 in the SND1-driven regulatory network for wood development,thereby creating a feedforward loop in SCW biosynthesis.

关键词： cellulose hemicellulose lignin PagMYB128 Populus transcription factor wood formation

Synergistically coupling of Ni–Fe LDH arrays with hollow Co–Mo sulfide nanotriangles for highly efficient overall water splitting

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Rare Metals 2024年第2期43卷 522-532页

作者： Yun jae Lee Seung-Keun Park Department of Advanced Materials Engineering Chung-Ang UniversityAnseongGyeonggi-do17546Republic of Korea Department of Intelligent Energy and Industry Chung-Ang University84 Heukseok-ro Dongjak-guSeoul06974Republic of Korea Western Seoul Center Korea Basic Science Institute150 Bugahyeon-roSeodaemun-guSeoul03759Republic of Korea

Developing bifunctional catalysts that can catalyze both oxygen evolution reaction(OER)and hydrogen evolution reaction(HER)is pivotal to commercializing large-scale water ***,a novel hollow nanotriangle composed of NiFe LDH-CoMoS_(x) heterojunction(H-CMSx@NiFe LDH)is proposed as a highly efficient bifunctional electrocatalyst for both OER and *** fabricate a heterojunction system,ultra-thin nickel–iron layered double hydroxide(NiFe LDH)nanosheets are uniformly electrodeposited onto a metal–organic framework-derived hollow CoMoS_(x) *** strong coupling of CoMoS_(x) and NiFe LDH catalysts forms the intimate heterojunction interfaces to facilitate interfacial charge transfer,which is favorable to enhance the bifunctional catalytic ***,the large void of CoMoS_(x) nanotriangles and interconnected ultra-thin NiFe LDH nanosheets result in good electrolyte penetration and gas ***,the as-prepared H-CMSx@NiFe LDH on nickel foam(NF)exhibits an impressive catalytic activity and durability for OER and HER activities,delivering a current density of 100 mA·cm^(−2) at the small overpotentials of 214 and 299 mV in OER and HER,***,H-CMSx@NiFe LDH/NF proves to be an effective electrode for an alkaline electrolyzer,as a voltage of only 1.99 V is enough to achieve a current density voltage of only 1.99 V is enough to achieve a current density of 400 mA·cm^(−2) with no degradation in performance over 50 h.

关键词： Overall water splitting Metal-organic framework Molybdenum sulfide Layered double hydroxide Heterojunction

Novel N-doped multichannel carbon nanofiber architecture with porous CoS nanoprisms for high-performance potassium-ion batteries

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Rare Metals 2024年第3期43卷 971-983页

作者： jae Bong Lim Seung-Keun Park Department of Advanced Materials Engineering Chung-Ang UniversityGyeonggi-do17546Republic of Korea Department of Intelligence Energy and Industry Chung-Ang UniversitySeoul06974Republic of Korea Western Seoul Center Korea Basic Science InstituteSeoul03759Republic of Korea

Potassium-ion batteries(PIBs)have gained significant attention as an alternative to lithium-ion batteries(LIBs)due to the abundance of potassium(K)and low ***,the difficulty in finding appropriate electrode materials that can efficiently store the larger K ions has hindered their practical ***,we report a novel anode material,N-doped multichannel carbon nanofibers embedded with porous CoS nanoprisms(CSP@NMCNF),for high-performance *** CSP@NMCNF was synthesized using a two-step strategy comprising of the electrospinning of Co acetate hydroxide nanoprism/binary polymer blend and a subsequent heat *** porous CoS nanoprisms with an anisotropic morphology were well aligned along the length axis of the N-doped multichannel carbon nanofibers,thus ensuring their structural stability during the repeated charge-discharge *** addition,numerous pores facilitated the transport of electrons and ***,the CSP@NMCNF anode exhibited excellent electrochemical performance,delivering a high specific capacity of 368 mAh·g^(-1)at 0.5 A·g^(-1)after 200 cycles and excellent rate capability(232 mAh·g^(-1)at 2.0 A·g^(-1)).

关键词： K-ion batteries Cobalt sulfide Multichannel structured composite Electrospinning Nanoprism Porous structure

Mixed-dimensional stacked nanocomposite structures for a specific wavelength-selectable ambipolar photoresponse

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Nano Research 2024年第6期17卷 5549-5558页

作者： Young jae Park jaeho Shim Joo Song Lee Kyu Seung Lee Ji-Yeon Kim Kang Bok ko Sang-Youp Yim Seongjun Kim Hoon-Kyu Shin Donghee Park Yong Ju Yun Dong Ick Son Institute of Advanced Composite Materials Korea Institute of Science and TechnologyJeollabuk-do 55324Republic of Korea National Institute for Nanomaterials Technology Pohang University of Science and TechnologyGyeongsangbuk-do 37673Republic of Korea Department of Semiconductor Science and Technology Semiconductor Physics Research CenterJeonbuk National UniversityJeonju 54896Republic of Korea Advanced Photonics Research Institute Gwangju Institute of Science and TechnologyGwangju 61005Republic of Korea Center for Opto-Electronic Materials and Devices Post-Silicon Semiconductor InstituteKorea Institute of Science and TechnologySeoul 02792Republic of Korea Graduate School of Energy and Environment(KU-KIST Green School) Korea UniversitySeoul 02841Republic of Korea KIST School Department of Nanomaterials and Nano ScienceUniversity of Science and Technology(UST)Daejeon 34113Republic of Korea

Mixed-dimensional composite structures using zero-dimensional(0D)quantum dots(QDs)and two-dimensional(2D)transition metal dichalcogenides(TMDs)materials are expected to attract great interest in optoelectronics due to the potential to generate new optical ***,we report on the unique optical characteristics of a devices with mixed dimensional vertically stacked structures based on tungsten diselenide(WSe_(2))/CdSeS QDs monolayer/molybdenum disulfide(MoS_(2))(2D/0D/2D).Specifically,it exhibits an ambipolar photoresponse characteristic,with a negative photoresponse observed in the 400-600 nm wavelength range and a positive photoresponse appeared at 700 nm *** resulted in the high negative responsivity of up to 52.22 mA·W^(−1)under 400 nm,which is 163 times higher than that of the photodetector without CdSeS *** also demonstrated the negative photoresponse,which could be due to increased carrier collision probability and non-radiative *** modeling and simulation reveal that Auger recombination among the types of non-radiative recombination is the main cause of negative photocurrent ***,we discovered ambipolar photoresponse near a specific wavelength corresponding to the energy of quantum *** study revealed interesting phenomenon in the mixed low-dimensional stacked structure and paved the way to exploit it for the development of innovative photodetection materials as well as for optoelectronic applications.

关键词： mixed-dimension quantum dot heterostructure photodetector ambipolar photoresponse

Electrochemically Deposited CZTSSe Thin Films for Monolithic Perovskite Tandem Solar Cells with Efficiencies Over 17%

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Energy & Environmental Materials 2024年第1期7卷 147-152页

作者： Sun Kyung Hwang Ik jae Park Se Won Seo jae Hyun Park So Jeong Park Jin Young Kim Department of Materials Science and Engineering Seoul National UniversitySeoul 08826Korea Department of Applied Physics Sookmyung Women's UniversitySeoul 04310Korea Research Institute of Advanced Materials and Systems Sookmyung Women's UniversitySeoul 04310Korea Research Institute of Advanced Materials(RIAM) Seoul National UniversitySeoul 08826Korea

In spite of the high potential economic feasibility of the tandem solar cells consisting of the halide perovskite and the kesterite Cu2ZnSn(S,Se)4(CZTSSe),they have rarely been demonstrated due to the difficulty in implementing solution-processed perovskite top cell on the rough surface of the bottom ***,we firstly demonstrate an efficient monolithic two-terminal perovskite/CZTSSe tandem solar cell by significantly reducing the surface roughness of the electrochemically deposited CZTSSe bottom *** surface roughness(R_(rms))of the CZTSSe thin film could be reduced from 424 to 86 nm by using the potentiostatic mode rather than using the conventional galvanostatic mode,which can be further reduced to 22 nm after the subsequent ion-milling *** perovskite top cell with a bandgap of 1.65 eV could be prepared using a solution process on the flattened CZTSSe bottom cell,resulting in the efficient perovskite/CZTSSe tandem solar *** the current matching between two subcells involving the thickness control of the perovskite layer,the best performing tandem device exhibited a high conversion efficiency of 17.5%without the hysteresis effect.

关键词： CZTSSe monolithic tandem solar cells perovskite solution process surface roughness control

Structural network characteristics affect epidemic severity and prediction in social contact networks

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Infectious Disease Modelling 2024年第1期9卷 204-213页

作者： jae McKee Tad Dallas Bioinnovation Program Tulane UniversityNew OrleansLA70118USA Department of Medicine Tulane University School of MedicineNew OrleansLA70112USA Department of Biological Sciences University of South CarolinaColumbiaSC29208USA

Understanding and mitigating epidemic spread in complex networks requires the measurement of structural network properties associated with epidemic *** measures of epidemic thresholds like the basic reproduction number(R0)have been adapted to account for the structure of social contact networks but still may be unable to capture epidemic potential relative to more recent measures based on spectral graph ***,we explore the ability of R0 and the spectral radius of the social contact network to estimate epidemic *** do so,we simulate epidemics on a series of constructed(small world,scale-free,and random networks)and a collection of over 700 empirical biological social contact ***,we explore how other network properties are related to these two epidemic estimators(R0 and spectral radius)and mean infection prevalence in simulated ***,we find that network properties strongly influence epidemic dynamics and the subsequent utility of R0 and spectral radius as indicators of epidemic risk.

关键词： Social contact network Spectral radius Epidemic severity Basic reproduction number