检索结果-南通市图书馆

Journal of Rare Earths 2023年第8期41卷 1127-1134,I0001页

作者： Qing Lin Tongyu Gao Yuanhong Liu Ronghui Liu Siwei Chen Xiaole Ma Chunlei Zhao national engineering research Center for Rare Earth GRINM Group Co.Ltd.Beijing 100088China GRIREM Advanced Materials Co. Ltd.Beijing 100088China General research institute for Nonferrous Metals Beijing 100088China

Red phosphor,with longer wavelength,is highly desirable for full-spectrum *** deep red phosphors(Sr,Gd)Li(AI,Mg)_(3)N_(4):Eu^(2+)were designed from the initial model of SrLiAl_(3)N_(4):Eu^(2+)by structural *** correlations among structural evolution,crystal-field environment,and luminescence properties were *** Sr^(2+)with Gd^(3+)in(Sr,Gd)LiAl_(3)N_(4):Eu^(2+)leads to the enhanced crystal field splitting,larger Stokes shift,and increased structural polyhedron distortion differences,consequently resulting in spectral red-shift and *** further spectral tuning,Mg,with lower electronegativity,was also introduced to modify the local crystal structure,consequently resulting in a further red-shift towards 675 nm and enhanced photoluminescence intensity in(Sr,Gd)Li(AI,Mg)_(3)N_(4):Eu^(2+).What’s more,w-LEDs were fabricated by using blue LED chip,blue,green,red and deep red((Sr,Gd)Li(Al,Mg)_(3)N_(4):Eu^(2+))phosphors whose color rendering index were Ra 96.0 and *** above results demonstrate that the partial replacements of Sr^(2+)by Gd^(3+)and Al^(3+)by Mg^(2+)are effective methods for spectral modulation and(Sr,Gd)Li(AI,Mg)_(3)N_(4):Eu^(2+)phosphors are suitable for highquality full-spectrum WLEDs.

关键词： Full-spectrum WLEDs Structural modulation Deep red phosphor Rare earths

Effect of MgCl_(2) on electrophoretic deposition of TbF_(3) powders on Nd-Fe-B sintered magnet

在线全文

学校读者我要写书评

暂无评论

Journal of Rare Earths 2023年第5期41卷 721-727,I0004页

作者： Chen Wang Yang Luo Zilong Wang Wenlong Yan Yanyan Zhao Ningtao Quan Haijun Peng Kaiwen Wu Yuehua Ma Chunlei Zhao Dunbo Yu national engineering research Center for Rare Earth GRINM Group Co.Ltd.Beijing 100088China GRIREM Advanced Materials Co. Ltd.Beijing 100088China General research institute for Nonferrous Metals Beijing 100088China

Using electrophoretic deposition(EPD)method,the TbF_(3)powders were deposited on the surface of sintered Nd-Fe-B magnets,and the effects of MgCl_(2)on electrophoretic deposition and grain boundary diffusion were *** results show that addition of 5 wt%MgCl_(2)can significantly improve the EPD efficiency and improve the adhesion of the coating by releasing local stress through the formation of special gully *** with Biesheuvel equation,the effects of suspension concentration,voltage and time on EPD amount were *** Biesheuvel equation can be simplified asγ=AUSct/L,and A(=0.0141-0.0144)in this experiment was calculated to achieve the quantitative calculation of EPD *** heat treatment of 875℃×10 h+500℃×1 h,the coercivity of 48H(7 mm)sintered magnet with 0.3 wt%TbF_(3)increases from 18.5 to 22.4 kOe,with an increase of 21.1%.The core-shell structure was observed by a back-scattered scanning electron microscope(BSE-SEM),which proves that the addition of MgCl_(2)has no adverse effect on the grain boundary diffusion of Nd-Fe-B sintered magnets.

关键词： Electrophoretic deposition Nd-Fe-B TbF_(3) Coating adhesion Grain boundary diffusion Rare earths

Protein kinase C-δ and -β coordinate flow-induced directionality and deformation of migratory human blood T-lymphocytes

在线全文

学校读者我要写书评

暂无评论

Journal of Molecular Cell Biology 2014年第6期8卷 458-472页

作者： Shu-Yi Wei Ting-Er Lin Wei-Li Wang Pei-Ling Lee Min-Chien Tsai Jeng-Jiann Chiu institute of Cellular and System Medicine 'National' Health Research Institutes Miaoli 350 Department of Physiology and Biophysics 'National' Defense Medical Center Taipei 114 institute of Biomedical engineering 'National' Tsing Hua University Hsinchu 300 institute of Biomedical engineering 'National' Cheng Kung University Tainan 701

在流动下面的 T 淋巴细胞移植为有免疫力的回答是批评的，但是由哪个流动调制 T 淋巴细胞的迁移的行为的机制仍然保持不清楚。当与 phorbol 12 十四酸盐 13 醋酸盐(PMA ) 刺激了时，人的外部血 T 淋巴细胞(PBTL ) 戏剧性地拉长了他们的... 详细信息

在流动下面的 T 淋巴细胞移植为有免疫力的回答是批评的，但是由哪个流动调制 T 淋巴细胞的迁移的行为的机制仍然保持不清楚。当与 phorbol 12 十四酸盐 13 醋酸盐(PMA ) 刺激了时，人的外部血 T 淋巴细胞(PBTL ) 戏剧性地拉长了他们的房间身体并且沿着流动方向移动了。相反，导出房间的 factor-1-stimulated PBTL 以一种随机的方式使变形了并且移居的 stromal。这里，我们阐明了位于刺激 PMA 的 PBTL 的导致流动的 directionality 和变丑下面的分子的机制。PMA 在流动下面为极化告知 PBTL，与蛋白质 kinase C (PKC )- 在 uropod 和外部区域在前缘，在组织中心的微导管的 PKC-I，和 PKC-II 充实。PKC- 通过 Tiam1/Rac1/calmodulin 在前缘调整了房间伸出，而 PKC- 调整了 RhoA/Rho-associated kinase 活动和微导管稳定性调制 uropod 收缩性和分开。我们的调查结果显示那 PKC- 并且 - 分别地，在房间前缘和 uropod 协调调制迁移的 T 淋巴细胞的 directionality 和 deformability 在下面流动。

关键词：外周血T淋巴细胞蛋白激酶C 流动方向变形性方向性迁移坐标人血

Deep learning for exploring ultra-thin ferroelectrics with highly improved sensitivity of piezoresponse force microscopy

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

npj Computational Materials 2023年第1期9卷 2066-2073页

作者： Panithan Sriboriboon Huimin Qiao Owoong Kwon Rama K.Vasudevan Stephen Jesse Yunseok Kim School of Advanced Materials and engineering Sungkyunkwan University(SKKU)SuwonRepublic of Korea research Center for Advanced Materials Technology Core Research InstituteSuwonRepublic of Korea Center for Nanophase Materials Sciences Oak Ridge National LaboratoryOak RidgeTNUSA

Hafnium oxide-based ferroelectrics have been extensively studied because of their existing ferroelectricity,even in ultra-thin film ***,studying the weak response from ultra-thin film requires improved measurement *** general,resonance-enhanced piezoresponse force microscopy(PFM)has been used to characterize ferroelectricity by fitting a simple harmonic oscillation model with the resonance ***,an iterative approach,such as traditional least squares(LS)fitting,is sensitive to noise and can result in the misunderstanding of weak *** this study,we developed the deep neural network(DNN)hybrid with deep denoising autoencoder(DDA)and principal component analysis(PCA)to extract resonance *** DDA/PCA-DNN improves the PFM sensitivity down to 0.3 pm,allowing measurement of weak piezoresponse with low excitation voltage in 10-nm-thick Hf_(0.5)Zr_(0.5)O_(2) thin *** hybrid approaches could provide more chances to explore the low piezoresponse of the ultra-thin ferroelectrics and could be applied to other microscopic techniques.

关键词： spectrum ferroelectric excitation

siRNA-functionalized lanthanide nanoparticle enables efficient endosomal escape and cancer treatment

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Nano research 2022年第10期15卷 9160-9168页

作者： Chanchan Yu Kun Li Lin Xu Bo Li Chunhui Li Shuai Guo Ziyue Li Yuquan Zhang Abid Hussain Hong Tan Mengyu Zhang Yongxiang Zhao Yuanyu Huang Xing-Jie Liang School of Life Science Advanced Research Institute of Multidisciplinary ScienceSchool of Medical Technology(Institute of Engineering Medicine)Key Laboratory of Molecular Medicine and BiotherapyKey Laboratory of Medical Molecule Science and Pharmaceutics EngineeringBeijing Institute of TechnologyBeijing 100081China CAS Key Laboratory for Biomedical Effects of Nanomaterials and Nanosafety CAS Center for Excellence in NanoscienceNational Center for Nanoscience and Technology of ChinaBeijing 100190China national Center for International research of Biological Targeting Diagnosis and Therapy Guangxi Key Laboratory of Biological Targeting Diagnosis and Therapy ResearchGuangxi Medical UniversityNanning 530021China

Attaching DNA/RNA to nanomaterials is the basis for nucleic acid-based assembly and drug ***,we report that small interfering RNA(siRNA)effectively coordinates with ligand-free lanthanide nanoparticles(NaGdF4 NPs),and forms siRNA/NaGdF4 spherical nucleic acids(SNA).The coordination is primarily attributed to the interaction between Gd and phosphate backbone of the ***,an efficient encapsulation and rapid endosomal escape of siRNA from the endosome/lysosome were achieved,due to its flexible ability to bound to phospholipid head of endosomal membrane,thereby disrupting the membrane *** to the dual properties of NaGdF4 NPs,siRNA loading,and endosomal escape,siRNA targeting programmed cell death-ligand 1(siPD-L1)/NaGdF4 SNA triggers significant gene silencing in vitro and in vivo,and effectively represses the tumor growth in both CT26 tumor model and 4T1 orthotopic murine model.

关键词： coordination chemistry nuclei acid lanthanide nanomaterials small interfering RNA(siRNA)delivery endosome escape

Unraveling the nature of cerium on stabilizing Cu/SAPO-34 NH_(3)-SCR catalysts under hydrothermal aging at low temperatures

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 Rare Earths 2023年第10期41卷 1551-1561,I0003页

作者： Weibo Zhang Meiqing Shen Jun Wang Xinyu Li Jianqiang Wang Gurong Shen Chen Wang School of Chemical engineering&Technology Tianjin UniversityTianjin300072China national Rare Earth Catalysis research institute Dongying257000China School of Materials Science and engineering Tianjin UniversityTianjin300072China School of Environmental and Safety engineering North University of ChinaTaiyuan030051China

To reveal how cerium stabilizes Cu/SAPO-34 at low-temperature hydrothermal aging,various amounts of cerium were introduced into Cu/SAPO-34 via impregnation method and treated at 70℃with RH 80%for 96 *** as Ce^(3+)and CeO_(2)nanoparticle is located on the surface of Cu/SAPO-34,and Ce^(3+)plays a vital role on gradually decreasing surface acidity and blocking defect sites with an increase of Ce *** hydrothermal aging,Cu/SAPO-34 with high Ce loading shows the superior SCR activity comparable to fresh *** is proven that the surface acidity determines the stability of the structure during hydrothermal aging process,and lower surface acidity prevents the number of Cu(Ⅱ)ions from decreasing ***,the structure's stability helps the recovery of Cu(Ⅱ)ions and renders an outstanding regene ration *** finding paves the way for the design of new Cu/SAPO-34catalysts with good SCR activity and long-term stability in real application.

关键词： Cu/SAPO-34 NH_(3)-SCR catalysts Low-temperature hydrothermal aging Cerium loading Surface acidity Long-term stability Rare earths

Development strategies and improved photocatalytic CO_(2) reduction performance of metal halide perovskite nanocrystals

在线全文

学校读者我要写书评

暂无评论

能源化学:英文版 2023年第8期83卷 397-422,I0011页

作者： Xianwei Fu Tingting Ren Shilong Jiao Zhihong Tian Jianjun Yang Qiuye Li engineering research Center for Nanomaterials National&Local Joint Engineering Research Center for Applied Technology of Hybrid NanomaterialsHenan UniversityKaifeng 475004HenanChina Key LabforSpecialFunctional Materials of Ministry of Education Collaborative Innovation Centerof NanoFunctional Materials and ApplicationsHenan UniversityKaifeng 475004 HenanChina Shenzhen research institute of Henan University Shenzhen 518000GuangdongChina

In recent years,photocatalytic CO_(2)reduction reaction(CRR) has attracted much scientific attention to overcome energy and environmental issues by converting CO_(2)into high-value-added chemicals utilizing solar *** halide perovskite(MHP) nanocrystals(NCs) are recognized as an ideal choice for CRR owing to their outstanding optoelectronic *** great efforts have been devoted to designing more effective photocatalysts to optimize CRR performance,severe charge recombination,instability,and unsatisfactory activity have become major bottlenecks in developing perovskite-based *** this review,we mainly focus on the recent research progress in the areas of ***,a brief insight into reaction mechanisms for CRR and structural features of MHPs are ***,efficient modification approaches for the improvement of the photocatalytic activity and stability of the perovskite-based catalysts are comprehensively ***,the state-of-the-art achievements of perovskite-based photocatalysts for CRR are systematically summarized and discussed,which are focused on the modification approaches,structure design,and the mechanism of the CO_(2)reduction ***,the current challenges and future research perspectives in the design and application of perovskite materials are highlighted from our point of view to provide helpful insights for seeking breakthroughs in the field of *** review may provide a guide for scientists interested in applying perovskite-based catalysts for solar-to-chemical energy conversion.

关键词： Photocatalytic CO_(2)reduction MHP nanocrystals Structure design Properties Stability

Saturation influence of control voltage on maglev stationary self-excited vibration

在线全文

学校读者我要写书评

暂无评论

中南大学学报：英文版 2016年第8期23卷 1954-1960页

作者：李金辉李杰余佩倡 College of Mechatronics engineering and Automation National University of Defense Technology Changsha 410073 China The First Engineers Scientific research institute of the General Armaments Department Wuxi 214035 China

This work addresses the saturation influence of control voltage on the occurring of self-excited vibration of maglev vehicle-bridge interaction system, which greatly degrades the stability of the levitation control, decreases the ride comfort, and restricts the cost of the whole system. Firstly, the interaction model of vehicle-bridge system is developed. Based on the interaction model, the relationship between the control voltage and vibration frequency is solved. Then, the variation of the effective direct component and fundamental harmonic are discussed. Furthermore, from the perspective of energy transmission between the levitation system and bridge, the principle underlying the self-excited vibration is explored, and the influence on the stability is discussed. Finally, in terms of the variation of the characteristic roots, the influence is analyzed further and some conclusions are obtained. This study provides a theoretical guidance for mastering the self-excited vibration problems.

关键词：自激振动控制电压磁悬浮列车饱和相互作用模型耦合系统磁悬浮车悬浮控制

Controlled Synthesis of Graphdiyne-Based Multiscale Catalysts for Energy Conversion

在线全文

学校读者我要写书评

暂无评论

Precision Chemistry 2024年第7期2卷 355-375页

作者： Siao Chen Xuchen Zheng Yang Gao Xinyu Ping Yurui Xue Yuliang Li CAS Key Laboratory of Organic Solids Institute of Chemistry Chinese Academy of SciencesBeijing 100190China Shandong Provincial Key Laboratory for Science of Material Creation and Energy Conversion Science Center for Material Creation and Energy ConversionSchool of Chemistry and Chemical EngineeringShandong UniversityJinan 250100China School of Chemical Sciences University of Chinese Academy of SciencesBeijing 100049China

Graphdiyne(GDY)science is a new and rapidly developing interdisciplinary field that touches on various areas of chemistry,physics,information science,material science,life science,environmental science,and so *** rapid development of GDY science is part of the trend in development of carbon ***,with its unique structure and fascinating properties,has greatly promoted fundamental research toward practical applications of carbon *** important applications,such as catalysis and energy conversion,have been *** particular,GDY has shown great potential for application in the field of *** have precisely synthesized a series of GDY-based multiscale catalysts and applied them in various energy conversion and catalysis research,including ammonia synthesis,hydrogen production,CO_(2) conversion,and chemical-to-electrical energy *** this paper,we systematically review the advances in the precisely controlled synthesis of GDY and aggregated structures,and the latest progress with GDY in catalysis and energy conversion.

关键词： graphdiyne controlled growth atom catalyst heterostructure energy conversion

A practical nonlinear controller for levitation system with magnetic flux feedback

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 Central South University 2016年第7期23卷 1729-1739页

作者：李金辉李杰 College of Mechatronics engineering and Automation National University of Defense TechnologyChangsha 410073China The First Engineers Scientific research institute of the General Armaments Department Wuxi 214035China

This work proposes a practical nonlinear controller for the MIMO levitation system. Firstly, the mathematical model of levitation modules is developed and the advantages of the control scheme with magnetic flux feedback are analyzed when compared with the current feedback. Then, a backstepping controller with magnetic flux feedback based on the mathematical model of levitation module is developed. To obtain magnetic flux signals for full-size maglev system, a physical method with induction coils installed to winding of the electromagnet is developed. Furthermore, to avoid its hardware addition, a novel conception of virtual magnetic flux feedback is proposed. To demonstrate the feasibility of the proposed controller, the nonlinear dynamic model of full-size maglev train with quintessential details is developed. Based on the nonlinear model, the numerical comparisons and related experimental validations are carried out. Finally, results illustrating closed-loop performance are provided.

关键词：非线性控制器磁悬浮系统磁通反馈非线性动态模型数学模型非线性模型 MIMO 控制方案