检索结果-南通市图书馆

A guide to use fluorinated aromatic bulky cations for stable and high-performance 2D/3D perovskite solar cells:The more fluorination the better?

引用

Journal of Energy Chemistry 2022年第1期31卷 179-189,I0006页

作者： Lei Wang Qin Zhou Zilong Zhang Wenbo Li Xiaobing Wang Qi ng Tian Xiaoyan Yu Ting sun Jihuai Wu Bao Zhang Peng Gao School of Chemical Engineering and Technology Tianjin UniversityTianjin 300072China CAS Key Laboratory of Design and Assembly of Functional Nanostructures and Fujian Provincial Key Laboratory of NanomaterialsFujian Institute of Research on the Structure of MatterChinese Academy of SciencesFuzhou 350002FujianChina Laboratory for Advanced Functional Materials.Xiamen Institute of Rare Earth Materials Haixi InstituteChinese Academy of SciencesXiamen 361021FujianChina College of Materials Science and Engineering Huaqiao University361021 XiamenFujianChina

While serious stability issues impede the commercialization of perovskite solar cells(PSCs),two-dime nsional(2D)perovskites based on fluorinated bulky cations have emerged as more intrinsically stable ***,the influence of fluorination degree of the bulky aromatic cation on the per-formance of resulting PSCs has not been ***,2D perovskites(FxPEA)_(2)PbI_(4)(x=1,2,3,5)are grown in situ on the surface of the three-dime nsion al(3D)perovskite and dem on strate effective passivation of the surface defects of 3D *** power conversion efficiency(PCE)of the optimized devices were boosted from 20.75%for the control device to 21.09%,22.06%,22.74%and 21.86%for 2D/3D devices treated with 4-fluorophenethylamine iodide,3,5-difluorophenylethylamine iodide,2,4,5-trifluoroethylphenylethylamine iodide,and 1,2,3,4,5-pentafluorophenylethylamine iodide,*** firstly reported two unexplored RP-type layered perovskites with F_(2)PEAI and F_(3)PEAI as bulky *** combined experimental and theoretical analysis revealed the reasons behind the various morphology,device performances,dynamic behavior,and humidity *** best performing F_(5)PEAI-treated device retaining 95.0%of its initial PCE under ambient atmosphere(with RH of 60%±5%)without encapsulation for 300 h *** work provides useful guidance for selecting fluorinated bulky cations with different molecular electronic properties,which will play an essential role in further improving the performance/stability of PSCs for the sake of further commercialization.

关键词： 2D perovskite Fluorinated spacer cation Perovskite solar cells Passivation Stability

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Eularian wall film model for predicting dynamic cell culture process to evaluate scaffold design in a perfusion bioreactor

引用

Medicine in Novel Technology and Devices 2022年第1期13卷 12-21页

作者： Ziyu Liu Chunjing Tao Shanshan Yuan Wei Wang Maryam Tamaddon Liqi ng Hao Huang Xiaodan sun Chaozong Liu Division of Surgery&Interventional Science University College LondonRoyal National Orthopaedic HospitalStanmore HA74LPUK School of Medical Science and Engineering Beihang UniversityChina Key Laboratory of Advanced Materials of Ministry of Education of China School of Materials Science and EngineeringTsinghua UniversityBeijingChina Department of Cardiology Qingdao Municipal HospitalShandongChina School of Science and Engineering The Chinese University of Hong KongShenzhenChina

In tissue engineering field,it is important to develop a suitable numerical model to evaluate scaffold geometry *** experimental evaluation of the effect of each specific scaffold parameter on tissue regeneration requires large cost and long time *** cell culture is commonly used for generating tissues which could replace damaged tissues.A perfusion bioreactor model is developed which is able to simulate dynamic cell culture,to evaluate scaffold *** wall-film model is used to simulate cell attachment with the assumption that cells could be seen as liquid *** the process of cell attachment,the cells could impinge to a solid surface and form a liquid film which were considered as cell attached on the scaffold *** types of cell-scaffold interactions were involved in numerical models including trap model and Stanton-Rutland(Cell impinge model—CIM)*** trap model,all cells impinged the scaffold are seen as *** Stanton-Rutland model,four regimes of cell-scaffold interaction are involved in the cell attachment,including stick,rebound,spread,and splash,and only stick and spread are seen as *** comparison with two different numerical methods,the results showed that CIM model result is more related to the experimental results than trap model,which indicated that four regimes of cell-scaffold interaction occurred in cell attachment *** evaluating two different geometry scaffold's cells seeding by these two models,the results further indicated that this model are able to use for assessing the scaffold design.

关键词： Scaffold structure Computational fluid dynamics Cell attachment Cell impinge model

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

An Efficient Second-Order Convergent Scheme for One-Side Space Fractional Diffusion Equations with Variable Coefficients

引用

Communications on Applied Mathematics and Computation 2020年第2期2卷 215-239页

作者： Xue-lei Lin Pin Lyu Michael Kng Hai-Wei sun Seakweng Vong Department of Mathematics Hong Kong Baptist UniversityHong KongChina School of Economic Mathematics Southwestern University of Finance and EconomicsChengdu 611130China Department of Mathematics The University of Hong KongHong KongChina Department of Mathematics University of MacaoMacaoChina

In this paper,a second-order fnite-diference scheme is investigated for time-dependent space fractional difusion equations with variable *** the presented scheme,the Crank-Nicolson temporal discretization and a second-order weighted-and-shifted Grünwald-Letnikov spatial discretization are ***,the unconditional stability and the second-order convergence in time and space of the proposed scheme are established under some conditions on the variable ***,a Toeplitz preconditioner is proposed for linear systems arising from the proposed *** condition number of the preconditioned matrix is proven to be bounded by a constant independent of the discretization step-sizes,so that the Krylov subspace solver for the preconditioned linear systems converges *** results are reported to show the convergence rate and the efciency of the proposed scheme.

关键词： One-side space fractional difusion equation Variable difusion coefcients Stability and convergence High-order fnite-diference scheme Preconditioner

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

超荷载条件下合成型水泥混合料拌堤坝弹性恢复机制

引用

华侨大学学报（自然科学版） 2016年第5期37卷 587-590页

作者：王侠孙文君河北水利电力学院基础部河北沧州061001 河北水利电力学院教务处河北沧州061001

通过对水泥材料、特定温拌剂的添加量、温度拌合技术和拌合摊铺技术等方面的优化分析,探讨在超荷载条件下堤坝弹性恢复能力的恢复机制.结果表明:改进的水泥混合料拌合成型技术所修筑的堤坝在超荷载下抗荷载强度提高明显,弹性恢复机制可... 详细信息

通过对水泥材料、特定温拌剂的添加量、温度拌合技术和拌合摊铺技术等方面的优化分析,探讨在超荷载条件下堤坝弹性恢复能力的恢复机制.结果表明:改进的水泥混合料拌合成型技术所修筑的堤坝在超荷载下抗荷载强度提高明显,弹性恢复机制可以提高成型堤坝在超荷载下的弹性恢复能力.

关键词：堤坝水泥混合料拌合成型超荷载弹性恢复机制

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

A computational study of the wing-wing and wing-body interactions of a model insect

引用

Acta Mechanica Sinica 2009年第4期25卷 421-431页

作者： Xin Yu Mao sun Institute of Applied Physics and Computational Mathematics Beihang University 100191 Beijing China Institute of Fluid Mechanics Beihang University 100191 Beijing China

The aerodynamic interaction between the contralateral wings and between the body and wings of a model insect are studied, by using the method of numerically solving the Navier-Stokes equations over moving overset grids, under typical hovering and forward flight conditions. Both the interaction between the contralateral wings and the interaction between the body and wings are very weak, e.g. at hovering, changes in aerodynamic forces of a wing due to the present of the other wing are less than 3% and changes in aerodynamic forces of the wings due to presence of the body are less than 2%. The reason for this is as following. During each down- or up-stroke, a wing produces a vortex ring, which induces a relatively large jet-like flow inside the ring but very small flow outside the ring. The vortex rings of the left and right wings are on the two sides of the body. Thus one wing is outside vortex ring of the other wing and the body is outside the vortex rings of the left and right wings, resulting in the weak interactions.

关键词： Insect Aerodynamics Wing/winginteraction Wing/body interaction

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

The effect of turbulence on NLOS underwater wireless optical communication channels [Invited]

引用

Chinese Optics Letters 2019年第10期17卷 80-87页

作者： Mohammed Sait Xiaobin sun Omar Alkhazragi Nasir Alfaraj Meiwei Kong Tien Khee ng Boon S.Ooi Photonics Laboratory King Abdullah University of Science and Technology (KAUST)

Conventional line-of-sight underwater wireless optical communication(UWOC)links suffer from huge signal fading in the presence of oceanic turbulence due to misalignment,which is caused by variations in the refractive index in the ***-line-of-sight(NLOS)communication,a novel underwater communication configuration,which has eased the requirements on the alignment,is supposed to enhance the robustness of the UWOC links in the presence of such *** Letter experimentally and statistically studies the impact of turbulence that arises from temperature gradient variations and the presence of different air bubble populations on NLOS optical *** results suggest that temperature gradient-induced turbulence causes negligible signal fading to the NLOS ***,the presence of air bubbles with different populations and sizes can enhance the received signal power by seizing the scattering phenomena from an ultraviolet 377 nm laser diode.

关键词： communication scattering turbulence

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

High-speed colour-converting photodetector with all-inorganic CsPbBr_(3) perovskite nanocrystals for ultraviolet light communication

引用

Light(Science & Applications) 2019年第1期8卷 306-317页

作者： Chun Hong Kang Ibrahim Dursun Guangyu Liu Lutfan Sinatra Xiaobin sun Meiwei Kong Jun Pan Partha Maity Ee-Ning Ooi Tien Khee ng Omar F.Mohammed Osman M.Bakr Boon S.Ooi Photonics Laboratory Division of ComputerElectricaland Mathematical Sciences and EngineeringKing Abdullah University of Science and Technology(KAUST)Thuwal 23955-6900Kingdom of Saudi Arabia Division of Physical Science and Engineering King Abdullah University of Science and Technology(KAUST)Thuwal 23955-6900Kingdom of Saudi Arabia Quantum Solutions LLC Thuwal 23955-6900Kingdom of Saudi Arabia

Optical wireless communication(OWC)using the ultra-broad spectrum of the visible-to-ultraviolet(UV)wavelength region remains a vital field of research for mitigating the saturated bandwidth of radio-frequency(RF)***,the lack of an efficient UV photodetection methodology hinders the development of UV-based *** key technological impediment is related to the low UV-photon absorption in existing silicon photodetectors,which offer low-cost and mature *** address this technology gap,we report a hybrid Sibased photodetection scheme by incorporating CsPbBr_(3) perovskite nanocrystals(NCs)with a high photoluminescence quantum yield(PLQY)and a fast photoluminescence(PL)decay time as a UV-to-visible colourconverting layer for high-speed solar-blind UV *** facile formation of drop-cast CsPbBr_(3) perovskite NCs leads to a high PLQY of up to ~73% and strong absorption in the UV *** the addition of the NC layer,a nearly threefold improvement in the responsivity and an increase of ~25% in the external quantum efficiency(EQE)of the solar-blind region compared to a commercial silicon-based photodetector were ***,timeresolved photoluminescence measurements demonstrated a decay time of 4.5 ns under a 372-nm UV excitation source,thus elucidating the potential of this layer as a fast colour-converting layer.A high data rate of up to 34 Mbps in solar-blind communication was achieved using the hybrid CsPbBr_(3)-silicon photodetection scheme in conjunction with a 278-nm UVC light-emitting diode(LED).These findings demonstrate the feasibility of an integrated high-speed photoreceiver design of a composition-tuneable perovskite-based phosphor and a low-cost silicon-based photodetector for UV communication.

关键词： perovskite ultraviolet inorganic

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

考虑弹性的高速旋转轮对振动特性研究

引用

振动工程学报 2016年第4期29卷 714-719页

作者：杨光任尊松孙守光北京交通大学机械与电子控制工程学院北京100044

轮对弹性变形和旋转振动对轮轨系统运行安全性影响需要从理论上进行深入研究。利用ANSYS有限元分析软件对轮对弹性化处理后,在SIMPACK多体动力学软件中建立了包含高速旋转弹性体轮对的车辆系统动力学模型。采用数值方法,得到了轮轴弹性... 详细信息

轮对弹性变形和旋转振动对轮轨系统运行安全性影响需要从理论上进行深入研究。利用ANSYS有限元分析软件对轮对弹性化处理后,在SIMPACK多体动力学软件中建立了包含高速旋转弹性体轮对的车辆系统动力学模型。采用数值方法,得到了轮轴弹性弯曲变形量以及不同轨道不平顺激扰下轮对垂向振动加速度响应等。结果表明,考虑弹性和旋转振动后,轮对车轴发生弯曲变形效应明显且中部变形量最大,车辆运行速度对车轴弯曲变形量和轮轨附加动力有一定的影响,轮对垂向振动加速度频谱出现与旋转速度相关的频率特征。本文方法和结果对揭示轮对真实运动特征和研究高速轮轨安全性具有良好的指导意义。

关键词：弹性轮对高速列车旋转频率特征

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Uniqueness and perturbation bounds for sparse non-negative tensor equations

引用

Frontiers of Mathematics in China 2018年第4期13卷 849-874页

作者： Dongdong LIU Wen LI Michael K. ng Seak-Weng VOng School of Applied Mathematics Guangdong University of Technology Guangzhou 510006 China School of Mathematical Sciences South China Normal University Guangzhou 510631China Department of Mathematics Hong Kong Baptist University Hong Kong China Department of Mathematics University of Macao Macao China

We discuss the uniqueness and the perturbation analysis for sparse non-negative tensor equations arriving from data sciences. By two different techniques, we may get better ranges of parameters to guarantee the uniqueness of the solution of the tensor equation. On the other hand, we present some perturbation bounds for the tensor equation. Numerical examples are given to show the efficiency of the theoretical results.

关键词： Stochastic tensor tensor equation uniqueness perturbation

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Clinically relevant factors associated with quantitative optical coherence tomography angiography metrics in deep capillary plexus in patients with diabetes

引用

Eye and Vision 2020年第1期7卷 64-74页

作者： Fang Yao Tang Erica O.Chan Zihan sun Raymond Wong Jerry Lok Simon Szeto Jason C.Chan Alexander Lam Clement C.Tham Danny S.ng Carol Y.Cheung Department of Ophthalmology and Visual Sciences The Chinese University of Hong KongHong Kong Special Administrative RegionKowloonChina Hong Kong Eye Hospital Hong Kong Special Administrative RegionKowloonChina CUHK Eye Centre Hong Kong Eye Hospital147K Argyle StreetKlnKowloonHong KongChina

Background:To test clinically relevant factors associated with quantitative artifact-free deep capillary plexus(DCP)metrics in patients with diabetes mellitus(DM).Methods:563 eligible eyes(221 with no diabetic retinopathy[DR],135 with mild DR,130 with moderate DR,and 77 with severe DR)from 334 subjects underwent optical coherence tomography-angiography(OCT-A)with a swept-source OCT(Triton DRI-OCT,Topcon,Inc.,Tokyo,Japan).Strict criteria were applied to exclude from analysis those DCP images with artifacts and of poor quality,including projection artifacts,motion artifacts,blurriness,signal loss,B-scan segmentation error,or low-quality score.A customized MATLAB program was then used to quantify DCP morphology from the artifact-free DCP images by calculating three metrics:foveal avascular zone(FAZ),vessel density(VD),and fractal dimension(FD).Results:166(29.5%)eyes were excluded after quality control,leaving in the analysis 397 eyes(170 with no DR,101 with mild DR,90 with moderate DR,36 with severe DR)from 250 *** the multiple regression models,larger FAZ area was associated with more severe DR(β=0.687;p=0.037),shorter axial length(AL)(β=−0.171;p=0.003),thinner subfoveal choroid thickness(β=−0.122;p=0.031),and lower body mass index(BMI)(β=−0.090;p=0.047).Lower VD was associated with more severe DR(β=−0.842;p=0.001),shorter AL(β=0.107;p=0.039),and poorer visual acuity(VA)(β=−0.133;p=0.021).Lower FD was associated with more severe DR(β=−0.891;pngful interpretations of DCP changes in DM patients.

关键词： Optical coherence tomography angiography Diabetic retinopathy Deep capillary plexus Visual acuity

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：