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Observation of robust anisotropy in WS_(2)/BP heterostructures

Nano Research 2024年第7期17卷 6749-6756页

作者： Xinran Li Xing Xie biao Wu Junying Chen Shaofei Li Jun He Zongwen liu Jian-Tao Wang Yanping liu Institute of Quantum Physics School of PhysicsCentral South University932 South Lushan RoadChangsha 410083China State Key Laboratory of Precision Manufacturing for Extreme Service Performance Central South University932 South Lushan RoadChangsha 410083China School of Chemical and Biomolecular Engineering The University of SydneyNSW 2006Australia The University of Sydney Nano Institute The University of SydneyNSW 2006Australia Beijing National Laboratory for Condensed Matter Physics Institute of PhysicsChinese Academy of SciencesBeijing 100190China School of Physical Sciences University of Chinese Academy of SciencesBeijing 100049China Songshan Lake Materials Laboratory Dongguan 523808China Shenzhen Research Institute of Central South University Shenzhen 518000China

Two-dimensional(2D)anisotropic materials have garnered significant attention in the realm of anisotropic optoelectronic devices due to their remarkable electrical,optical,thermal,and mechanical *** extensive research has delved into the optical and electrical characteristics of these materials,there remains a need for further exploration to identify novel materials and structures capable of fulfilling device requirements under various ***,we employ heterojunction interface engineering with black phosphorus(BP)to disrupt the C3 rotational symmetry of monolayer WS_(2).The resulting WS_(2)/BP heterostructure exhibits pronounced anisotropy in exciton emissions,with a measured anisotropic ratio of 1.84 for neutral *** a comprehensive analysis of magnetic-field-dependent and temperature-evolution photoluminescence spectra,we discern varying trends in the polarization ratio,notably observing a substantial anisotropy ratio of 1.94 at a temperature of 1.6 K and a magnetic field of 9 *** dynamic behavior is attributed to the susceptibility of the WS_(2)/BP heterostructure interface strain to fluctuations in magnetic fields and *** findings provide valuable insights into the design of anisotropic optoelectronic devices capable of adaptation to a range of magnetic fields and temperatures,thereby advancing the frontier of material-driven device engineering.

关键词： two-dimensional materials in-plane anisotropy black phosphorus heterojunctions optoelectronic devices photoluminescence spectra

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交联改性电池隔膜与传统聚烯烃隔膜的区别及特性比较

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粘接 2024年第4期51卷 9-11页

作者：何方波马六甲李恒刘彪廖培龙吴永琪珠海恩捷新材料科技有限公司广东珠海519050 北京理工大学珠海学院广东珠海519000

隔膜在动力电池中的作用是至关重要的,隔膜是动力电池的重要组成部分,位于电池的正负极之间,防止正负极之间的直接接触,防止电池短路,还能够控制电池内部离子传输,防止电池内部出现不均匀的化学反应,从而延长电池的寿命。为了改善电池... 详细信息

隔膜在动力电池中的作用是至关重要的,隔膜是动力电池的重要组成部分,位于电池的正负极之间,防止正负极之间的直接接触,防止电池短路,还能够控制电池内部离子传输,防止电池内部出现不均匀的化学反应,从而延长电池的寿命。为了改善电池隔膜的性能,研究主要介绍了动力电池隔膜的制备技术,深入探讨一种新型有机无机复合隔膜,可以起到保护电极的作用,防止电极被机械损伤或化学反应损伤。隔膜它可以保证电池的安全性和稳定性,延长电池的寿命,提高电池的性能表现。

关键词：隔膜动力电池有机无机复合隔膜稳定性

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Extraction and recycling technologies of cobalt from primary and secondary resources:A comprehensive review

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International Journal of Minerals,Metallurgy and Materials 2024年第4期31卷 628-649页

作者： Yukun Huang Pengxu Chen Xuanzhao Shu biao Fu Weijun Peng Jiang liu Yijun Cao Xiaofeng Zhu ZhongYuan Critical Metals Laboratory Zhengzhou UniversityZhengzhou 450001China State Key Laboratory of Advanced Processing and Recycling of Nonferrous Metals Lanzhou University of TechnologyLanzhou 730050China

Cobalt has excellent electrochemical,magnetic,and heat *** a strategic resource,it has been applied in many hightech ***,the recent rapid growth of the battery industry has substantially depleted cobalt resources,leading to a crisis of cobalt resource *** paper examines cobalt ore reserves and distribution,and the recent development and consumption of cobalt resources are summarized as *** addition,the principles,advantages and disadvantages,and research status of various methods are discussed *** can be concluded that the use of diverse sources(Cu-Co ores,Ni-Co ores,zinc plant residues,and waste cobalt products)for cobalt production should be enhanced to meet developmental ***,in recovery technology,the pyro-hydrometallurgical process employs pyrometallurgy as the pretreatment to modify the phase structure of cobalt minerals,enhancing its recovery in the hydrometallurgical stage and facilitating high-purity cobalt ***,it represents a promising technology for future cobalt ***,based on the above conclusions,the prospects for cobalt are assessed regarding cobalt ore processing and sustainable cobalt recycling,for which further study should be conducted.

关键词： cobalt recovery copper-cobalt ore nickel-cobalt ore zinc plant residue waste cobalt products

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Research advance of Bacillus velezensis:bioinformatics,characteristics,and applications

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Food Science and Human Wellness 2024年第4期13卷 1756-1766页

作者： Ting Su biao Shen Xingjuan Hu Yue Teng Peifang Weng Zufang Wu Lianliang liu State Key Laboratory for Managing Biotic and Chemical Threats to the Quality and Safety of Agro-products Key Laboratory of Animal Protein Deep Processing Technology of ZhejiangZhejiang-Malaysia Joint Research Laboratory for Agricultural Product Processing and NutritionSchool of Food and Pharmaceutical SciencesNingbo UniversityNingbo 315000China Zhoushan Customs District Zhoushan 316100China

Bacillus velezensis is a Gram-positive and spore-forming *** has potent antimicrobial properties that can be used to promote plant growth and as a pesticide by inhibiting *** has the capability to generate a diverse range of enzymes that have potential applications in various fields,such as enzyme production,fermented food,degradation of pollutants,and *** addition,*** is a promising *** possesses high bile-salt tolerance characteristics and has a high success rate of colonization in the intestinal ***,the strain can also regulate gut microbiota constitute by increasing the number of beneficial microorganisms and decreasing the number of ***,based on its special properties,including high-yield protease production and high salt-tolerance,*** shows potential for use in marine protein fermentation,opening up new avenues for the development of novel food products and bioactive *** addition,*** can shorten the fermentation time as well as improve the nutritional value and flavor of fermented *** safety of *** for food production was *** review provides valuable insights into the potential uses and benefits of ***,particularly in the context of fermented foods.

关键词： Bacillus velezensis Bioinformatics Properties Fermentation Bioactive peptides

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Asymptotic Behavior of Singular Solution to the k-Hessian Equation with a Matukuma-Type Source

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Wuhan University Journal of Natural Sciences 2024年第3期29卷 242-256页

作者： liu Jinyu WANG biao CHANG Caihong College of Science Xi'an University of Science and TechnologyXi'an 710054ShaanxiChina

This paper is concerned with radially positive solutions of the k-Hessian equation involving a Matukuma-type source S_(k)(D^(2)(-φ))=|x|^(λ-2)/(1+|x|^(2))^(λ2)φ^(q),x∈Ω,where S_(k)(D^(2)(-φ))is the k-Hessian operator,q>k>1,λ>0,n>2k,k∈N,andΩis a suitable bounded do-main in R~*** turns out that there are two different types of radially positive solutions for k>1,i.e.,M-solution(singular at r=0)and Esolution(regular at r=0),which is distinct from the case when k=*** 1

关键词： k-Hessian equation singular solutions asymptotic expansion

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Redshift drift reconstruction for some cosmological models from observations

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Research in Astronomy and Astrophysics 2013年第12期13卷 1397-1408页

作者： Ming-Jian Zhang Wen-biao liu Department of Physics Institute of Theoretical PhysicsBeijing Normal University

Redshift drift is a tool to directly probe the expansion history of the uni- verse. Based on the Friedmann-Robertson-Walker framework, we reconstruct the ve- locity drift and deceleration factor for several cosmological models using observa- tional H（z） data from the differential ages of galaxies and baryon acoustic oscillation peaks, luminosity distance of Type Ia supernovae, cosmic microwave background shift parameter, and baryon acoustic oscillation distance parameter. They can, for the first time, provide an objective and quantifiable measure of the redshift drift. We find that reconstructed velocity drift with different peak values and corresponding redshifts can potentially provide a method to distinguish the quality of competing dark energy mod- els at low redshifts. Better fitting between models and observational data indicate that current data are insufficient to distinguish the quality of these models. However, by comparing with the simulated velocity drift from Liske et al, we find that the Dvali- Gabadadze-Porrati model is inconsistent with the data at high redshift, which origi- nally piqued the interest of researchers in the topic of redshift drift. Considering the deceleration factor, we are able to give a stable instantaneous estimation of a transition redshift of zt ~ 0.7 from joint constraints, which incorporates a more complete set of values than the previous study that used a single data set.

关键词： redshift drift: cosmology -- reconstruction -- observation

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气温对湖水源热泵性能影响的理论分析

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制冷与空调 2024年第5期24卷 77-81,102页

作者：胡秋明罗景辉武雪梅刘彪吴晓轩张昌建力高(天津)地产有限公司河北工程大学中国建筑第八工程局有限公司华北公司

气温对湖水源热泵性能影响较大。通过建立湖水热平衡模型,得到了湖水温度与气温的关系,计算了建筑冷负荷及湖水源热泵的性能系数。以南京某工程为例,进行了模拟计算,结果显示:由于气温影响,夏季湖水温度比气温低3~8℃,湖水源热泵的取水... 详细信息

气温对湖水源热泵性能影响较大。通过建立湖水热平衡模型,得到了湖水温度与气温的关系,计算了建筑冷负荷及湖水源热泵的性能系数。以南京某工程为例,进行了模拟计算,结果显示:由于气温影响,夏季湖水温度比气温低3~8℃,湖水源热泵的取水温度在32℃以下,夏季气温的升高引起湖水温度、建筑负荷及湖水源热泵机组能耗的增大,从而导致湖水源热泵性能系数(COP)的下降,夏季湖水源热泵COP值保持在3.8~6.6之间;冬季湖水温度比气温高3~8℃,湖水源热泵的取水温度基本保持在5℃以上,能够保证湖水源热泵的正常运行,湖水源热泵COP值上升速度随着气温的升高由小变大,保持在3.5~5.8之间。

关键词：气温湖水源热泵冷负荷性能系数

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Dynamic manipulation of multimodal emission in Er^(3+)-activated non-core-shell structure for optical thermometry and information security

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Rare Metals 2024年第4期43卷 1702-1712页

作者： Xuan liu Zi-Xia Lin Yin-biao Shi Xiao-Yan Wang Ming-Ye Ding Xiao-Fei Yang College of Science Nanjing Forestry UniversityNanjing210037China Testing Center Yangzhou UniversityYangzhou225009China

Regulating luminescent dynamics of lanthanide-based luminescent materials via external stimuli is of great significance in the fields of optical thermometry and high-level ***,it is still a huge challenge to realize multimodal emissions with tunable color outputs from a single activator in simple structures via smart dynamic control of photon transition ***,we present a mechanistic strategy to achieve multimodal luminescence of Er^(3+)activators with color-switchable outputs in a non-core-shell *** the control of excitation dynamics(λ_(ex)=980,808,1532,377 nm),the population among the intermediate en ergy levels of Er^(3+)and the interaction between Er^(3+)and Yb^(3+)could be precisely modulated through energy transfer and migration processes,leading to the generation of colortunable multimodal luminescence upon diverse excitation modes(non-steady-state,single-/dual-wavelength steady,thermal activation).Inspired by its special luminescent performance,the as-obtained material exhibits great potential in noncontact thermometry,multimodal anticounterfeiting,and high-capacity information encryption by performing a series of proof-of-concept *** findings might provide a conceptual model to modulate the luminescent dynamics in a simple-structured system for the generation of color-adjustable multimodal emissions,which is convenient for the development of advanced luminescent materials toward versatile cuttingedge applications.

关键词： Lanthanide ions Multimodal emission Upconversion Downshifting Anti-counterfeiting Luminescent thermometry

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单原子活化过硫酸盐降解有机污染物研究进展

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工业水处理 2024年第7期44卷 38-46页

作者：赵杰吴俊峰窦艳艳 Fedorov Svyatoslav VIKTOROVICH 王现丽刘彪朱新锋毛艳丽高宏斌中原工学院能源与环境学院河南郑州450007 河南城建学院河南省水体污染防治与修复重点实验室河南平顶山467036 圣彼得堡国立建筑工程大学环境与市政工程学院俄罗斯圣彼得堡190005

随着工业的迅速发展,含有大量难降解有机污染物的生活生产废水被排入水体,对人体健康与环境产生严重威胁。基于过硫酸盐的高级氧化技术在处理难降解有机废水上有着突出表现,而采用单原子催化剂能最大限度地利用金属原子,减少金属离子溶... 详细信息

随着工业的迅速发展,含有大量难降解有机污染物的生活生产废水被排入水体,对人体健康与环境产生严重威胁。基于过硫酸盐的高级氧化技术在处理难降解有机废水上有着突出表现,而采用单原子催化剂能最大限度地利用金属原子,减少金属离子溶出,在活化过硫酸盐降解有机污染物中有很好的应用前景。综述了单原子催化剂的制备方法,并阐述了各种方法的优缺点。分别论述了Fe、Co、Mn和Cu等金属单原子催化剂活化过硫酸盐降解有机污染物的应用,并总结了单原子催化剂活化过硫酸盐的机理以及单原子催化剂活化过硫酸盐体系对有机污染物的降解机理。最后对单原子催化剂活化过硫酸盐降解有机污染物未来的发展做出了讨论及展望。

关键词：单原子催化剂过硫酸盐有机污染物金属基催化剂

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Tuning the Johari-Goldstein β-Relaxation and Its Separation from α-Relaxation of Poly(n-alkyl methacrylate)s by Small Molecule-bridged Hydrogen Bonds

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Chinese Journal of Polymer Science 2021年第11期39卷 1459-1469页

作者： Yuan-biao liu Gao-Peng Shi Guo-Zhang Wu Shanghai Key Laboratory of Advanced Polymeric Materials School of Materials Science&EngineeringEast China University of Science&TechnologyShanghai 200237China

Introducing small molecule-bridged hydrogen bonds(HBs)between polymer chains has been reported to effectively reduce the interchain cooperativity despite of strengthening the intermolecular ***,a systematic investigation on tuning the Johari-Goldsteinβ(βJG)relaxation by adding various low-molecular-weight phenols in poly(n-alkyl methacrylate)s is carried out to further clarify the anomalous *** these small molecules capable of coupling the motion with pendent groups of host polymers due to forming at least two HBs per molecule,poly(n-alkyl methacrylate)mixtures exhibit rich dynamic changes in theβJG-properties andα,βJG *** increased loading of phenols with a small size and strong inter-HB strength(Δυi)clearly benefits for significant retardation and suppression of theβJG-relaxation,narrows theα,βJG separation and converges theβJG-peak with theα-peak,which demonstrates the alleviation of inter-chain topological ***,small molecules with a relatively big size and weakΔυi are found to amplify the magnitude of theα,βJG separation of poly(butyl methacrylate),even though experimental results of changes inα-dispersion and dynamic fragility confirm a reduction of the coupling factor n in all of these *** counterintuitive phenomenon suggests that the crossover time tc in the Coupling Model is no longer a universal quantity if the inter-chain interaction of polymers is strengthened by *** compelling findings shed vital insights into the HBinduced anomalous dynamics,and provide essential guidance for tailoring theβJG behavior and designing glassy polymeric materials.

关键词： Johari-Goldsteinβ-relaxation Hydrogen bond Glass transition Poly(n-alkyl methacrylate) Small molecule

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