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Janus MXene film with gradient structure for highly efficient terahertz and infrared electromagnetic absorption

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Nano Research 2025年第1期18卷 434-442页

作者： Shaodian Yang Weiqiang Huang Zhiqiang Lin Zibo Chen Rongliang Yang Yi Jia Xuebin liu Rui wang zhiping Zeng Yougen Hu Huanjun Chen Xuchun Gui11 State Key Laboratory of Optoelectronic Materials and Technologies School of Electronics and Information TechnologySun Yat-sen UniversityGuangzhou 510275China National Key Laboratory of Materials for Integrated Circuits Shenzhen Institute of Advanced Electronic MaterialsShenzhen Institute of Advanced TechnologyChinese Academy of SciencesShenzhen 518055China china Academy of Aerospace Science and Innovation Beijing 100176China Guangdong Province Key Laboratory of Display Material and Technology Guangzhou 510275China School of Materials Science and Engineering Sun Yat-sen UniversityGuangzhou 510275China

Electromagnetic interference (EMI) shielding inhigh-frequency range, especially the rapidly growing terahertz(THz) frequency range, attracts increasing attention due tothe potential application of terahertz in 6G wirelesscommunication, and security inspection. However, traditionalconductive EMI films typically achieve high shieldingeffectiveness through strong reflection, which may causesecondary pollution to other devices. Here, a gradientstructure strategy was proposed to constructTi_(3)C_(2)Tx/hydroxypropyl methyl cellulose (HPMC) film, in whichthe content of Ti_(3)C_(2)Tx gradually increases along the thicknessdirection, resulting in different conductivity of the two surfaces(surface-M and surface-H) for the film. The obtained gradientfilmexhibits an EMI shielding efficiency of over 48.5 dB in theTHz range (0.2-1.6 THz) at a thickness of 40 μm. Especially,as the THz waves incident from the surface-H to the film, the absorption effectiveness reaches 48.2 dB (average absorbedpower loss up to 91.4%), and the reflection effectiveness is only 0.3 dB. In additions, the gradient-film also demonstrates ahigh absorption rate of 95.5% in the infrared band (2.5-16.7 μm). Moreover, the gradient-film exhibits an excellent tensilestress and Young’s modulus value of 173.1 MPa and 2.8 GPa, respectively. Therefore, the gradient-film proposed in thiswork, with excellent electromagnetic absorption in both THz and infrared band, provides a promising candidate for the nextgenerationEMI shielding applications.

关键词： electromagnetic interference shielding Janus film terahertz MXene

Petrographic Features and Sedimentary Environments of the Middle-Upper Ordovician at Shetai Town of Urad Front Banner, Inner Mongolia

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Acta Geologica Sinica(English Edition) 1991年第4期65卷 401-416,459页

作者： Zhang Xiulian wang Yinghua Pan Rongsheng Department of Geology,Peking university liu linqun Department of Geology Peking University

Most of the hinterland of the North china platform is devoid of Late Ordovician strata. The BaiyanhuaMountain section at Shetai Town is a standard section of the Upper Ordovician newly established in recentyears at the northernmost margin of the platform. This establishment directly involved the determination of thenorth boundary of the platform and the understanding of its evolutionary Listory. The area is quite differentfrom the binterland of the platform in Middle Ordovician rock types and sedimentary environments, with theformer characterized by frequent slope deposits and the latter consisting almost entirely of platform deposits.The present paper focuses on the petrographic features and sedimentary ervironments of the Middle-UpperOrdovician strata in the area, providing further theoretical support to the establishment of the section and fil-ling the gap in this respect.

关键词： Petrographic Features and Sedimentary Environments of the Middle-Upper Ordovician at Shetai Town of Urad Front Banner

Prenatal prednisone exposure disturbs fetal kidney development and its characteristics

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Journal of Environmental Sciences 2024年第11期145卷 75-87页

作者： zhiping Xia Songdi wang Wen wang Yutang liu Tianshu Yang Hui wang Ying Ao Department of Pharmacology Wuhan University School of Basic Medical SciencesWuhan 430071China hubei Provincial Key Laboratory of Developmentally Originated Disease Wuhan 430071China

Prednisone is a synthetic glucocorticoid that is commonly used in both human and veterinary ***,it is also recognized as an emerging environmental *** be exposed to prednisone actively or passively throughmultiple pathways and cause developmental toxicity to the ***,the impact of prenatal prednisone exposure(PPE)on fetal kidney development remains *** this study,pregnant mice were administered prednisone intragastrically during full-term pregnancy with different doses(0.25,0.5,or 1 mg/(kg·day)),or at the dose of 1 mg/(kg·day)in different gestational days(GD)(GD0-9,GD10-18,or GD0-18).The pregnant mice were euthanized on *** staining revealed fetal kidney dysplasia,with an enlarged glomerular Bowman’s capsule space and a reduced capillary network in the PPE *** expression of the podocyte and the mesangial cell marker genes was significantly reduced in the PPE ***,overall gene expression in renal tubules and collecting ducts were markedly *** of the above effects were more pronounced in high-dose,full-term pregnancy,and female *** on the mechanism of the female fetal kidney have revealed that PPE reduced the expression of Six2,increased the expression of Hnf1β,Hnf4α,and Wnt9b,and inhibited the expression of glial cell line-derived neurotrophic factor(GDNF)and Notch signaling *** conclusion,this study demonstrated that there is a sex difference in the developmental toxicity of PPE to the fetal kidney,and the time effect is manifested as full-term pregnancy>early pregnancy>mid-late pregnancy.

关键词： Prenatal prednisone exposure Kidney developmental toxicity Glomerulus Toxicity characteristics

Augmentation of tribenuron methyl removal from polluted soil with Bacillus *** BS2 and indigenous earthworms

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Journal of Environmental Sciences 2012年第8期24卷 1492-1497页

作者： Qiang Tang zhiping Zhao Yajun liu Nanxi wang Baojun wang Yanan wang Ningyi Zhou Shuangjiang liu State Key Laboratory of Microbial Resources Institute of MicrobiologyChinese Academy of SciencesBeijing 100101China College of Life Science University of Science and TechnologyHefei 230026China Key Laboratory of Microbial Engineering at the Institute of Biology Henan Academy of SciencesZhengzhou 450008China Key Laboratory of Agricultural and Environmental Microbiology Wuhan Institute of VirologyChinese Academy of Sciences44 Xiao-Hong-ShanWuhan 430071China

Tribenuron methyl （TBM） is a member of the sulfonylurea herbicide family and is widely used worldwide. In this study, TBM- degrading bacteria were enriched with TBM as potential carbon, nitrogen or sulfur source, and 44 bacterial isolates were obtained. These isolates were phylogenetically diverse, and were grouped into 25 operational taxonomic units and 14 currently known genera. Three representatives, Bacillus sp. strain BS2, Microbacterium sp. strain BS3, and Cellulosimicrobium sp. strain BSI 1, were selected, and their growth and TBM removal from culture broth were investigated. In addition, indigenous earthworms were collected and applied to augment TBM degradation in lab-scale soil column experiments. Results demonstrated that Bacillus sp. strain BS2 and earthworms significantly increased TBM removal during soil column experiments.

关键词： biodegradation of tribenuron methyl Bacillus Microbacterium Cellulosimicrobium earthworm

Thermal Stability and Strengthening Effect of Coherent Precipitates in a (FeCoNi)_(92)Al_(2.5)Ti_(5.5) High Entropy Alloy

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Acta Metallurgica Sinica(English Letters) 2024年第9期37卷 1491-1500页

作者： Yuqi liu Feng wang Songyang Chen Hui wang zhiping Xiong Khurram Yaqoob Zhangwei wang Min Song tate Key Laboratory of Powder Metallurgy Central South UniversityChangsha410083China State Key Laboratory for Advance Metals and Materials University of Science and Technology BeijingBeijing100083China National Key Laboratory of Science and Technology on Materials Under Shock and Impact Beijing100081China School of Chemical and Materials Engineering National University of Sciences and TechnologyH-12Islamabad44000Pakistan

The coarsening behavior and strengthening effect of L1_(2)-Ni_(3)(Ti,Al)precipitates in a face-centered-cubic(FCC)(FeCoNi)_(92)Al_(2.5)Ti_(5.5) high entropy alloy have been systematically *** coherent L1_(2) precipitates,uniformly distributed throughout the FCC matrix,consistently retain a spherical *** coarsening rate coefficient of precipitate is determined by employing the Philippe-Voorhees(PV)model,suggesting excellent thermal ***,the elemental partitioning and compositional evolution of the L1_(2) precipitates is analyzed by atom probe tomography,which identify aluminum(Al)as the slowest diffusion species during the coarsening *** addition,the precipitation strengthening effect is quantified to ascertain the optimal size of the *** study enhances the understanding of precipitate coarsening in high entropy alloys,presenting valuable insights into their thermal stability and mechanical properties.

关键词： High entropy alloy L1_(2)precipitates Coarsening kinetics Precipitation hardening

Effect of Supersonic Fine Particles Bombarding on the Service Life of Thermal Barrier Coating

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Chinese Journal of Mechanical Engineering 2011年第5期24卷 911-916页

作者： LIN Xiaoping DONG Yun wang zhiping liu Shiqiang REN Zhimin DING Kunying Department of Materials Science and Engineering Northeastern Universi（y at Qinhuangdao Qinhuangdao 066004 China College of Science Civil Aviation University of China Tianjin 300300 China School of Material Science and Engineering Hebei University of Technology Tianjin 300130 China

Thermally Grown Oxide（TGO） is a dominating component in controlling the effectiveness of thermal barrier *** the growth of TGO,whether we could homogeneously distribute Al atom on the TGO and the intermediate metal layer will be the key factor in forming TGO with continuous,uniform and single-ingredient（Al2O3）.In this experiment,we bombarded particles on to the metallic bound *** studied the influence of supersonic particle bombardment on the diffusion of *** hope to control the growth of TGO by monitoring the diffusion of *** barrier coating（TBC）,which consists of a NiCoCrAlY bond coat and a ZrO2-8Y2O3（wt.%） topcoat（TC）,is fabricated on the nickel-base superalloy by air plasma spray（APS）.NiCoCrAlY bond coat is treated by supersonic fine particles bombarding（SFPB）.The morphology,oxidation behavior of TBC and phase are characterized by scanning electron microscope（SEM） equipped with an energy dispersive spectromrter（EDS） and X-ray diffractometer（XRD）.The influence of supersonic fine particles bombarding technique on the service life of thermal barrier coating is *** results show that SFPB technique improves the flaw of excessive surface undulation in the as-sprayed bond coat.A continuous,uniform and single-ingredient（Al2O3） TGO can quickly form in the SFPB TBC during high temperature oxidation *** thickening of TGO is relatively *** will effectively suppress the formation of other non-protective ***,SFPB technique reduces the growth stress level generated by the continuous growth of TGO,and also avoids the stress concentration induced by formation of the large particle spinal *** barrier coating still remains well after 350 thermal *** service life of TBC is *** proposed research provides theoretical basis and technical references to further improve and enhance the SFPB technique.

关键词： thermal barrier coating stress concentration supersonic fine particles bombarding thermally grown oxide

Analysis on the hourly spatiotemporal complementarities between china's solar and wind energy resources spreading in a wide area

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Science china Technological Sciences 2013年第3期56卷 683-692页

作者： liu Yi XIAO LiYe wang HaiFeng DAI ShaoTao QI zhiping Key Laboratory of Applied Superconductivity Chinese Academy of Sciences Institute of Electrical Engineering Chinese Academy of Sciences The Queen's university of Belfast Belfast BT9 5AHUK

china is rich in solar and wind energy resources,of which the proportion of china’s power sources has been rapidly *** fluctuating and intermittent energy sources will bring significant challenges to the safe and stable operation power ***,making use of the spatiotemporal complementarities between different renewable energy resources is a feasible way to level fluctuating power especially when they have a widely geographical *** on the data provided by china Meteorological Administration(CMA),this research explores the spatiotemporal complementarities between wind and solar energy *** paper nondimensionalizes hourly wind speed and global solar radiation data and employs several indexes to compare the smoothing effect with various combining *** results show that combining wind and solar powers within a certain area can cause a fall of zero-power or very-full power ***,combining different resources improves ’smoothness’ in power output when compared with that from each individual ***,under hourly time scale,when the dispersion of sites is large enough,the smoothing effect of combining the dispersed wind power is very close to the combination of those two different ***,this complementary effect is much better than that of just combining solar energy resources.

关键词： wind energy solar energy complementarities renewable energy

Quantitative analysis of conjunctival microvasculature imaged using optical coherence tomography angiography

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Eye and Vision 2019年第1期6卷 32-40页

作者： zhiping liu Hua wang Hong Jiang Giovana Rosa Gameiro Jianhua wang Ophthalmic Center the Second Affiliated Hospital of Guangzhou Medical UniversityGuangzhouGuangdongChina Department of Ophthalmology Bascom Palmer Eye InstituteUniversity of Miami Miller School of Medicine1638 NW 10th AvenueMcKnight Building-Room 202AMiamiFL 33136USA. Department of Ophthalmology Xiangya HospitalCentral South UniversityChangshaHunanChina

Background:The goal was to quantitatively analyze the bulbar conjunctival microvascular density using optical coherence tomography angiography(OCTA)and compare it to the vessel density using functional slit-lamp biomicroscopy(FSLB).Methods:Temporal bulbar conjunctiva of 20 eyes(10 healthy subjects)was imaged using both OCTA and *** processing was performed including equalization,de-noising,thresholding,and *** vessel density was measured by fractal analysis(box counting,Dbox)and pixel counting(%).Results:Vessel density(Dbox)of the bulbar conjunctiva obtained using OCTA was 1.28±0.01 Dbox,which was significantly lower than the result(1.32±0.01 Dbox,P0.05)between both instruments were found in both vessel density methods(Dbox and percentage).However,in each of the devices,vessel density in Dbox was significantly correlated with the vessel density in percentage(r=1.0 for FSLB and r=0.98 for OCTA,both P<0.001).Conclusion:This study demonstrated that the vessel density of the bulbar conjunctiva obtained using OCTA can be quantified,and the results were not compatible with that obtained using slit-lamp biomicroscopy photography.

关键词： Conjunctival microvasculature Optical coherence tomography angiography(OCTA) Functional slit lamp bio-microscopy(FSLB) Anterior segment

Task-Oriented Semantic Communication with Foundation Models

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china Communications 2024年第7期21卷 65-77页

作者： Chen Mingkai liu Minghao Zhang Zhe Xu zhiping wang Lei Key Laboratory of Broadband Wireless Communication and Sensor Network Technology Ministry of EducationNanjing University of Posts and TelecommunicationsNanjing 210003China School of Ocean Information Engineering Jimei UniversityXiamen 361021China Key Laboratory of Underwater Acoustic Communication and Marine Information Technology(Xiamen university) Ministry EducationXiamen 361005China

In the future development direction of the sixth generation(6G)mobile communication,several communication models are proposed to face the growing challenges of the *** rapid development of artificial intelligence(AI)foundation models provides significant support for efficient and intelligent communication *** this paper,we propose an innovative semantic communication paradigm called task-oriented semantic communication system with foundation ***,we segment the image by using task prompts based on the segment anything model(SAM)and contrastive language-image pretraining(CLIP).Meanwhile,we adopt Bezier curve to enhance the mask to improve the segmentation ***,we have differentiated semantic compression and transmission approaches for segmented ***,we fuse different semantic information based on the conditional diffusion model to generate high-quality images that satisfy the users'specific task ***,the experimental results show that the proposed system compresses the semantic information effectively and improves the robustness of semantic communication.

关键词： diffusion model foundation model joint source-channel coding task-oriented semantic communication