检索结果-南通市图书馆

Functionalized, carbon nanotube material for the catalytic degradation of organophosphate nerve agents

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Nano Research 2014年第3期7卷 390-398页

作者： Mark M. Bailey John M. Heddleston Jeffrey Davis Jessica L. Staymates Angela R. Hight Walker National Institute of standards and Technology (NIST) Semiconductor and Dimensional Metrology Division Gaithersburg MD USA National Institute of standards and Technology (NIST) Materials Measurement Science Division Gaithersburg MD USA Present Address: United States Army Medical Research Institute of Infectious Diseases (USAMRIID) Center for Aerobiological Sciences Fort Detrick MD USA

Recent world events have emphasized the need to develop innovative, functional materials that will safely neutralize chemical warfare （CW） agents in situ to protect military personnel and civilians from dermal exposure. Here, we demonstrate the efficacy of a novel, proof-of-concept design for a Cu-containing catalyst, chemically bonded to a single-wall carbon nanotube （SWCNT） structural support, to effectively degrade an organophosphate simulant. SWCNTs have high tensile strength and are flexible and light-weight, which make them a desirable structural component for unique, fabric-like materials. This study aims to develop a self-decontaminating, carbon nanotube-derived material that can ultimately be incorporated into a wearable fabric or protective material to minimize dermal exposure to organophosphate nerve agents and to prevent accidental exposure during decontamination procedures. Carboxylated SWCNTs were functionalized with a polymer, which contained Cu-chelating bipyridine groups, and their catalytic activity against an organophosphate simulant was measured over time. The catalytically active, functionalized nanomaterial was characterized using X-ray fluorescence and Raman spectroscopy. Assuming zeroth-order reaction kinetics, the hydrolysis rate of the organophosphate simulant, as monitored by UV-vis absorption in the presence of the catalytically active nanomaterial, was 63 times faster than the uncatalyzed hydrolysis rate for a sample containing only carboxylated SWCNTs or a control sample containing no added nanotube materials.

关键词： single-wall carbonnanotubefunctionalization catalytically-activenanomaterial chemical warfare agent

Influence of quench on ageing response and mechanical properties of Al-Zn-Mg-Cu-Zr alloy

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

中国有色金属学会会刊：英文版 2005年第S3期15卷 18-22页

作者：樊喜刚蒋大鸣孟庆昌 Analysis and measurement center Harbin Institute of Technology Harbin 150001 China

The effect of quench rate and transfer time on the precipitation sequence and mechanical properties of an Al-Zn-Mg-Cu-Zr alloy was investigated. A consistent trend of the decrease of ductility with the decrease of quench rate and the increase of transfer time was observed. This is attributed to the quench-induced precipitates of equilibrium MgZn2 phase formed along subgrain and grain boundaries, which promotes the intergranular fracture. The strength decreases greatly when the transfer time is over 90s, resulting from the heterogeneous precipitation on dispersoids or dislocations. The quench water temperature has a little influence on the evolution of matrix precipitates and strength. This alloy exhibits less quench sensitivity.

关键词： Al-Zn-Mg-Cu-Zr alloy quench ductility strength

Atomistic Line Graph Neural Network for improved materials property predictions

在线全文

学校读者我要写书评

暂无评论

npj Computational Materials 2021年第1期7卷 1691-1698页

作者： Kamal Choudhary Brian DeCost Materials measurement Laboratory National Institute of Standards and TechnologyGaithersburgMD 20899USA Theiss ResearchLa Jolla California 92037USA DeepMaterials LLC Silver SpringMD 20906USA

Graph neural networks(GNN)have been shown to provide substantial performance improvements for atomistic material representation and modeling compared with descriptor-based machine learning *** most existing GNN models for atomistic predictions are based on atomic distance information,they do not explicitly incorporate bond angles,which are critical for distinguishing many atomic ***,many material properties are known to be sensitive to slight changes in bond *** present an Atomistic Line Graph Neural Network(ALIGNN),a GNN architecture that performs message passing on both the interatomic bond graph and its line graph corresponding to bond *** demonstrate that angle information can be explicitly and efficiently included,leading to improved performance on multiple atomistic prediction *** ALIGNN models for predicting 52 solid-state and molecular properties available in the JARVIS-DFT,Materials project,and QM9 *** can outperform some previously reported GNN models on atomistic prediction tasks by up to 85%in accuracy with better or comparable model training speed.

关键词： explicitly property passing

Tunnel silicon nitride manipulated reconfigurable bi-mode nociceptor analog

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Photonics Research 2024年第08期12卷 1820-1827页

作者： CHENGDONG YANG YILONG LIU LINLIN SU XINWEI LI LIHUA XU QIMEI CHENG Jiangsu Province Engineering Research center of Integrated Circuit Reliability Technology and Testing System Wuxi University

Neuromorphic applications have shown great promise not only for efficient parallel computing mode to hold certain computational tasks,such as perception and recognition,but also as key biomimetic elements for th intelligent sensory system of next-generation ***,achieving such a biomimetic nociceptor tha can adaptively switch operation mode with a stimulation threshold remains a *** rational design of material properties and device structures,we realized an easily-fabricated,low-energy,and reconfigurable no *** is capable of threshold-triggered adaptive bi-mode jump that resembles the biological alarm system With a tunnel silicon nitride （Si3N4） we mimicked the intensity-and rehearsal-triggered jump by means of th tunneling mode transition of *** threshold signals the device can also express some common synaptic functions with an extremely low energy density of 33.5 f J∕μ*** addition,through the modulation o Si3N4thickness it is relatively easy to fabricate the device with differing pain *** nociceptor analog based on a tunneling layer provides an opportunity for the analog pain alarm system and opens up a new path toward threshold-related novel applications.

关键词： Indium tin oxide Material properties Pressure measurement Pressure sensors Silicon nitride Tunneling

Pars plana vitrectomy for retinal detachment using perfluoro-n-octane as intraoperative tamponade:a multicenter,randomized,non-inferiority trial

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

International Journal of Ophthalmology(English edition) 2024年第1期17卷 82-91页

作者： Xin Shi Wei-Jun Wang Ying Fan Hai-Yun Liu Hong Wang Yu-Hui Chen Ao Rong Zhi-Feng Wu Xun Xu Kun Liu Department of Ophthalmology Shanghai General HospitalShanghai Jiao Tong University School of MedicineNational Clinical Research Center for Eye DiseasesShanghai Key Laboratory of Ocular Fundus DiseasesShanghai Engineering Center for Visual Science and PhotomedicineShanghai Engineering Center for Precise Diagnosis and Treatment of Eye DiseasesShanghai 200085China Shanghai Jieshi Medical Technology Co.Ltd. Shanghai 201201China Department of Ophthalmology Tongji HospitalSchool of MedicineTongji UniversityShanghai 200065China Department of Ophthalmology Wuxi No.2 People’s Hospital(Jiangnan University Medical CenterJUMC)Wuxi 214002Jiangsu ProvinceChina

AIM:To evaluate the efficacy and safety of perfluoro-n-octane(PFO)for ophthalmic surgery versus F-Octane as an intraoperative tamponade in pars plana vitrectomy(PPV)in management of retinal ***:This multicenter,prospective,randomized,double-masked,parallel-controlled,non-inferiority trial was conducted in three ophthalmology clinical centers in *** with retinal detachment,who were eligible for PPV were consecutively *** were assigned to PFO for ophthalmic surgery or F-Octane for intraocular tamponade in a 1:1 ***-corrected visual acuity(BCVA),intraocular pressure(IOP)measurement,and dilated fundus examination were performed preoperatively and at 1,7±1,28±3d *** primary outcome was complete retinal reattachment rate at postoperative day *** non-inferiority margin was set at 9.8%.The secondary outcomes included intraoperative retinal reattachment rate,and mean changes in IOP and BCVA from baseline to 1,7±1,28±3d postoperatively,*** analyses were presented for all randomly assigned participates in this ***:Totally 124 eligible patients completed the study between Mar.14,2016 and Jun.7,*** of them were randomly assigned to the PFO for ophthalmic surgery group,and 64 were assigned to the F-Octane *** characteristics were comparable between the two *** groups achieved 100%retinal reattachment at postoperative day one(difference 0,95%CI:-6.21%to 5.75%,P=1).The pre-defined noninferiority criterion was *** significant difference was observed in intraoperative retinal reattachment rate(difference 1.77%,P=0.61),mean changes in IOP(difference 0.36,-0.09,2.22 mm Hg at 1,7±1,28±3d postoperatively,with all P>0.05)and BCVA(difference 0.04,-0.02,0.06 logMAR at 1,7±1,28±3d postoperatively,all P>0.05)between the two *** apparent adverse events related to the utilization of PFO were ***:In patients with retinal detachment undergoing PPV,PFO

关键词： perfluoro-n-octane vitreoretinal surgery intraocular tamponade ophthalmic surgery retinal detachment

Stark splitting of intense red emission for Er^(3+)in O_(h) symmetry sites realizing optical temperature sensing in biological applications

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Rare Metals 2024年第3期43卷 1263-1274页

作者： Yue Guo Lin-Jun Qin Jing Xu Xiao-Ping Jiang Xiao-Yu Yue Yi Hou Hao Shi Li-Xi Wang Qi-Tu Zhang Collage of Materials Science and Engineering Nanjing Tech UniversityNanjing211816China Jiangsu Collaborative Innovation center for Advanced Inorganic Function Composites Nanjing211816China

Optical temperature sensing based on the fluorescence intensity ratio(FIR)of red emission for lanthanide ions holds significant relevance in non-contact temperature measurement for biological *** this study,the perovskite-structured KZnF_(3)is utilized as a host material for Er^(3+)to achieve a high-purity upconversion(UC)red *** observed Stark splitting of the red emission peak provides evidence of the energy level splitting of Er^(3+).Group theory is employed to decompose the spectral branching of Er^(3+)under the point group symmetry of KZnF_(3),allowing for the derivation of Stark splitting energy levels induced by the crystal field *** optical temperature-sensing behavior of the red UC luminescence was investigated,specifically examining the FIR of the splitting sub-peaks,which exhibited an exponential relationship with *** KZnF_(3):Yb^(3+),Er^(3+)demonstrated a relative sensitivity(S_(r))of 0.00182%·K^(-1)at 298 K,highlighting its excellent response to *** vivo bio-thermometry experiments conducted on chicken breast validated the material's ability to penetrate biological tissues and showed its significant sensitivity of the FIR to *** results establish KZnF_(3):Yb^(3+),Er^(3+)as a promising material for optical thermometry in various biological applications.

关键词： KZnF_(3) Er^(3+) Upconversion luminescence Stark splitting Temperature sensing

Nonlinear photonics with metasurfaces

在线全文

学校读者我要写书评

暂无评论

Photonics Research 2023年第2期11卷 122-136页

作者： POLINA VABISHCHEVICH YURI KIVSHAR Physical measurement Laboratory National Institute of Standards and TechnologyGaithersburgMaryland 20899USA Department of Chemistry and Biochemistry University of MarylandCollege ParkMaryland 20742USA Nonlinear Physics center Research School of PhysicsAustralian National UniversityCanberra ACT 2601Australia

Nonlinear optics is a well-established field of research that traditionally relies on the interaction of light with macroscopic nonlinear media over distances significantly greater than the wavelength of light. However, the recently emerged field of optical metasurfaces provides a novel platform for studying nonlinear phenomena in planar geometries. Nonlinear optical metasurfaces introduce new functionalities to the field of nonlinear optics extending them beyond perturbative regimes of harmonic generation and parametric frequency conversion,being driven by mode-matching, resonances, and relaxed phase-matching conditions. Here we review the very recent advances in the rapidly developing field of nonlinear metasurface photonics, emphasizing multi-frequency and cascading effects, asymmetric and chiral frequency conversion, nonperturbative nonlinear regimes, and nonlinear quantum photonics, empowered by the physics of Mie resonances and optical bound states in the continuum.

关键词： Nonlinear nonlinear optics

Hierarchical model updating for high-speed maglev vehicle/guideway coupled system based on multiobjective optimization

在线全文

学校读者我要写书评

暂无评论

Frontiers of Structural and Civil Engineering 2024年第5期18卷 788-804页

作者： Dexiang Li Jingyu Huang College of Civil Engineering Tongji UniversityShanghai 200092China National Maglev Transportation Engineering R&D center Tongji UniversityShanghai 201804China

The high-speed maglev vehicle/guideway coupled model is an essential simulation tool for investigating vehicle dynamics and mitigating coupled *** improve its accuracy efficiently,this study investigated a hierarchical model updating method integrated with field ***,a high-speed maglev vehicle/guideway coupled model,taking into account the real effect of guideway material properties and elastic restraint of bearings,was developed by integrating the finite element method,multi-body dynamics,and electromagnetic levitation ***,simultaneous in-site measurements of the vehicle/guideway were conducted on a high-speed maglev test line to analyze the system response and structural modal *** the hierarchical updating,an Elman neural network with the optimal Latin hypercube sampling method was used to substitute the FE guideway model,thus improving the computational *** multi-objective particle swarm optimization algorithm with the gray relational projection method was applied to hierarchically update the parameters of the guideway layer and magnetic force layer based on the measured modal parameters and the electromagnet vibration,***,the updated coupled model was compared with the field measurements,and the results demonstrated the model’s accuracy in simulating the actual dynamic response,validating the effectiveness of the updating method.

关键词： high-speed maglev vehicle/guideway coupled model field measurement model updating neural network multi-objective optimization

Ingenious liquid-observed vapor exchange (LOVE) NMR method revealing how sugars protect dry protein structure

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Magnetic Resonance Letters 2024年第2期4卷 75-76页

作者： Geying Ru Conggang Li Key Laboratory of Magnetic Resonance in Biological Systems State Key Laboratory of Magnetic Resonance and Atomic and Molecular PhysicsNational Center for Magnetic Resonance in WuhanWuhan Institute of Physics and MathematicsInnovation Academy for Precision Measurement Science and TechnologyChinese Academy of SciencesWuhan430071China Wuhan National Laboratory for Optoelectronics Huazhong University of Science and TechnologyWuhan430074China

Recently,Gary et *** an article elucidating how sugars contribute to the protection of dry protein *** utilized an ingenious liquid-observed vapor exchange(LOVE)nuclear magnetic resonance(NMR)method,providing valuable insights into the protection mechanism of sugars during the drying *** details of their study can be found in the article available at https://***/10.1021/***.2c00692.

关键词： structure sugar revealing