检索结果-南通市图书馆

Goldstein枝切法对存在间断相位缺陷的解缠研究

在线全文

学校读者我要写书评

暂无评论

激光技术 2014年第3期38卷 335-341页

作者：曾凡光吴光敏 mai john d 陈剑鸣昆明理工大学理学院昆明650500 香港城市大学机械与生物医学工程学系

Goldstein枝切法作为相位解缠中路径积分法的重要算法之一,其解缠结果易受到噪声或间断相位缺陷所引起的残差点影响。为了研究相位间断缺陷对解缠算法的影响,模拟了具有间断相位缺陷的数据,采用Goldstein枝切法进行了系统的解缠研究。... 详细信息

Goldstein枝切法作为相位解缠中路径积分法的重要算法之一,其解缠结果易受到噪声或间断相位缺陷所引起的残差点影响。为了研究相位间断缺陷对解缠算法的影响,模拟了具有间断相位缺陷的数据,采用Goldstein枝切法进行了系统的解缠研究。重点研究了残差点对枝切线的搜索窗口半径大小的影响,并将解缠相位与真实相位进行了比较。结果表明,在单相位间断和双不相交的相位间断缺陷的情况下,Goldstein枝切法仍然具有较好的解缠效果;对于双交叉相位间断缺陷,Goldstein枝切法在这一局部区域无法得到正确的解缠结果;通过研究枝切线搜索窗口半径对解缠的影响,验证了存在"有效枝切线搜索窗口半径"的结论。此实验结果对于采用或联合采用Goldstein枝切法进行的相位解缠理论研究和应用具有参考价值。

关键词：信息光学枝切法相位缺陷搜索窗口半径

Targeting TrkB–PSd-95 coupling to mitigate neurological disorders

在线全文

学校读者我要写书评

暂无评论

Neural Regeneration Research 2025年第3期20卷 715-724页

作者： Xin Yang Yu-Wen Alvin Huang john Marshall department of Molecular Biology Cell Biology and BiochemistryBrown UniversityProvidenceRIUSA department of Neurology Warren Alpert Medical School of Brown UniversityProvidenceRIUSA Center for Translational Neuroscience Robert J.and Nancy D.Carney Institute for Brain Science and Brown Institute for Translational ScienceBrown UniversityProvidenceRIUSA

Tropomyosin receptor kinase B(TrkB)signaling plays a pivotal role in dendritic growth and dendritic spine formation to promote learning and *** activity-dependent release of brain-derived neurotrophic factor at synapses binds to pre-or postsynaptic TrkB resulting in the strengthening of synapses,reflected by long-term ***,the association of postsynaptic density protein-95 with TrkB enhances phospholipase Cγ-Ca^(2+)/calmodulin-dependent protein kinaseⅡand phosphatidylinositol 3-kinase-mechanistic target of rapamycin signaling required for long-term *** this review,we discuss TrkB-postsynaptic density protein-95 coupling as a promising strategy to magnify brain-derived neurotrophic factor signaling towards the development of novel therapeutics for specific neurological disorders.A reduction of TrkB signaling has been observed in neurodegenerative disorders,such as Alzheimer's disease and Huntington's disease,and enhancement of postsynaptic density protein-95 association with TrkB signaling could mitigate the observed deficiency of neuronal connectivity in schizophrenia and *** with brain-derived neurotrophic factor is problematic,due to poor pharmacokinetics,low brain penetration,and side effects resulting from activation of the p75 neurotrophin receptor or the truncated TrkB.T1 *** TrkB agonists and antibodies that activate TrkB are being intensively investigated,they cannot distinguish the multiple human TrkB splicing isoforms or cell type-specific *** TrkB–postsynaptic density protein-95 coupling provides an alternative approach to specifically boost TrkB signaling at localized synaptic sites versus global stimulation that risks many adverse side effects.

关键词： Angelman syndrome autism brain-derived neurotrophic factor depression neurodegenerative disorder neurodevelopmental disorder postsynaptic density protein-95 synaptic plasticity TrkB

A spotlight on dosage and subject selection for effective neuroprotection: exploring the central role of mitochondria

在线全文

学校读者我要写书评

暂无评论

Neural Regeneration Research 2025年第4期20卷 1081-1082页

作者： john Mitrofanis Jonathan Stone Michael R.Hamblin Pierre Magistretti Alim-Louis Benabid Glen Jeffery Fonds Clinatec UniversitéGrenoble AlpesGrenobleFrance School of Medical Science University of SydneySydneyAustralia Faculty of Health Sciences University of JohannesburgJohannesburgSouth Africa King Abdullah University of Science and Technology ThuwalSaudi Arabia Institute of Ophthalmology University College LondonLondonUK

Neurons are notoriously vulnerable cell *** the slightest change in their internal and/or external environments will cause much distress and dysfunction,leading often to their death.A range of pathological conditions,including stroke,head trauma,and neurodegenerative disease,can generate stress in neurons,affecting their survival and proper *** most neural pathologies,mitochondria become dysfunctional and this plays a pivotal role in the process of cell *** challenge over the last few decades has been to develop effective interventions that improve neuronal homeostasis under pathological *** interventions,often referred to as disease-modifying or neuroprotective,have,however,proved frustratingly elusive,at both preclinical and,in particular,clinical *** this perspective,we highlight two factors that we feel are key to the development of effective neuroprotective *** are:firstly,the choice of dose of intervention and method of application,and secondly,the selection of subjects,whether they be patients or the animal model.

关键词： protective dosage distress

Mesoporous cobalt oxide for largely improved lithium storage properties

在线全文

学校读者我要写书评

暂无评论

Chinese Chemical Letters 2012年第8期23卷 949-952页

作者： mai Xia Ma Faculty of Chemistry and Material Science Langfang Teachers CollegeLangfang 065000China

We report the microstructure, application for lithium-ion batteries of mesoporous Co304 prepared by modified KIT-6 template method. The sample was characterized by XRd, TEM, HRTEM and nitrogen adsorption. Their electrochemical behaviors as electrode reactants for lithium ion batteries were evaluated by cyclic voltammograms and static charge-discharge. A direct comparison of electrochemical behaviors between mesoporous nanostructure and bulk reflects interesting ＂nanostructure effect＂, which is reasonably discussed in terms of how the 3d nanostructures of Co3O4 materials function in tuning their electrochemistry. The results demonstrate that further improvement of electrochemical performance in transition metal-oxide-based anode materials can be realized via the design of multiporous nanostructured materials.

关键词： Mesoporous Co3O4 High lithium storage capacity Nanostructure effect

在线全文

学校读者我要写书评

暂无评论

分子印迹型薄膜体声波谐振毒品检测传感器

光学精密工程 2013年第9期21卷 2272-2278页

作者：陈剑鸣吕启蒙吴光敏楚合群 john d mai 昆明理工大学MEMS实验室云南昆明650500 香港城市大学机械与生物医学工程学系

针对毒品探测的需求,对高灵敏度、高选择性及可工作于液相环境中的传感器进行了研究,利用分子印迹技术(MIT),结合薄膜体声波谐振器(FBAR)和微流体(micro fluidics)技术构造了新型传感器。首先,阐述了用分子印迹技术制作FBAR吸附层材料... 详细信息

针对毒品探测的需求,对高灵敏度、高选择性及可工作于液相环境中的传感器进行了研究,利用分子印迹技术(MIT),结合薄膜体声波谐振器(FBAR)和微流体(micro fluidics)技术构造了新型传感器。首先,阐述了用分子印迹技术制作FBAR吸附层材料的原理,利用分子印迹技术制备了对特定毒品分子具有专一吸附性的印迹材料,将其作为吸附层涂覆在基于微机电系统(MEMS)及微流体技术的FBAR上。根据压电方程和运动学方程推导出了FBAR压电振子的等效电路及电学端口输入阻抗公式,构建了以AlN为压电材料的微流体结构FBAR毒品检测传感器模型。对该结构的FBAR传感器进行了理论研究和公式推导,并在理论模型的基础上进行了仿真实验,得到了单位面积质量响度达0.8 pg/Hz·cm2的FBAR传感器。得到的实验结果远高于石英晶体微天平这一传统的质量敏感型传感器,可实现对溶液中毒品分子的快速检测。

关键词：微机电系统薄膜体声波谐振器分子印迹技术微流体技术毒品检测传感器

Three dimensional porous frameworks for lithium dendrite suppression

在线全文

学校读者我要写书评

暂无评论

Journal of Energy Chemistry 2020年第5期29卷 73-89页

作者： Shuyan Ni Shuangshuang Tan Qinyou An Liqiang mai State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhan 430070HubeiChina

Lithium metal is a promising anode material owing to its very low electrochemical potential and ultrahigh specific ***,the growth of lithium dendrites could result in a short lifespan,low coulombic efficiency,and potential safety hazards during the progress of lithium plating/*** factors drastically hinder its application in lithium metal *** review focuses on the use of three dimensional(3d)porous host frameworks to improve Li plating/stripping behaviors,accommodate the change in volume,and suppress or block lithium dendrite *** 3d porous frameworks,including the conductive carbon-based,metal-based,and lithiophilic inorganic-compound frameworks are introduced and summarized in *** particular functions,relative developments,and optimized strategies of various 3d porous frameworks for lithium deposition/dissolution behaviors are ***,the challenges and promising developments in the field of Li metal anodes will be discussed at the end of this review.

关键词： Lithium metal battery 3d porous frameworks Lithium dendrite Lithium sulfur batteries Lithium oxygen batteries Li plating/stripping

(Super)paramagnetic nanoparticles as platform materials for environmental applications: From synthesis to demonstration

在线全文

学校读者我要写书评

暂无评论

Frontiers of Environmental Science & Engineering 2020年第5期14卷 15-23页

作者： Wenlu Li john d.Fortner department of Chemical and Environmental Engineering Yale UniversityNew HavenCT 06520USA

Over the past few decades,engineered,(super)paramagnetic nanoparticles have drawn extensive research attention for a broad range of applications based on their tunable size and shape,surface chemistries,and magnetic *** review summaries our recent work on the synthesis,surface modification,and environmental application of(super)paramagnetic *** utilizing high-temperature thermo-decomposition methods,first,we have broadly demonstrated the synthesis of highly monodispersed,(super)paramagnetic nanoparticles,via the pyrolysis of metal carboxylate salts in an organic *** uniform magnetic nanoparticles with various size,composition,and shape can be precisely tuned by controlled reaction parameters,such as the initial precursors,heating rate,final reaction temperature,reaction time,and the *** materials can be further rendered water stable via functionalization with surface mono/bi-layer coating structure using a series of tunable ionic/non-ionic ***,we have demonstrated platform potential of these materials for heavy metal ions sensing,sorption,and separation from the aqueous phase.

关键词： Superparamagnetic nanoparticles Surface functionalization Environmental sensing Heavy metal ion sorption

Tuning the particle size,physical properties,and photocatalytic activity of Ag_(3)PO_(4)materials by changing the Ag^(+)/PO_(4)^(3-)ratio

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

Chinese Physics B 2023年第3期32卷 561-568页

作者： Hung N M Oanh L T M Chung d P Thang d V mai V T Hang L T Minh N V Center for Nano Science and Technology Hanoi National University of Education136 Xuan Thuy RoadCau Giay DistrictHanoi 100000Vietnam department of Physics Hanoi National University of Education136 Xuan Thuy RoadCau Giay DistrictHanoi 100000Vietnam Hanoi University of Mining and Geology Duc Thang WardNorth Tu Liem DistrictHanoi 100000Vietnam Institute of Materials Science Vietnam Academy of Science and Technology18 Hoang Quoc VietHanoi 100000Vietnam Faculty of Basic Sciences Hanoi University of Natural Resources and Environment41 A Phu Dien RoadNorth Tu LiemHanoi 100000Vietnam

This study demonstrates the influence of the Ag^(+)/PO_(4)^(3-)ratio in precursor solution on the crystal structural formation,morphology,physical properties,and photocatalytic performance of a Ag_(3)PO_(4)photocatalyst that is fabricated,using a facile precipitation method,from AgNO_(3)and Na2HPO_(4)·12H_(2)*** material characterizations were carried out using x-ray diffraction(XRd),scanning electron microscopy(SEM),energy-dispersive x-ray spectroscopy(EdX),Brunauer–Emmett–Teller(BET)surface area,Fourier transform infrared(FTIR)absorption,Raman scattering,x-ray photoelectron spectroscopy(XPS),UV-vis absorption,and photoluminescence(PL).The results show that Ag_(3)PO_(4)crystallizes better when the excess PO_(4)^(3-)content increases,and the lattice parameters decrease slightly,while the crystal diameter and the particle size *** change is also observed in the Raman scattering and FTIR spectra with the increase in the vibration frequency of the[PO_(4)]*** compression of the[PO_(4)]unit was also confirmed in the XPS spectra with the shift of P 2p peaks toward higher binding *** photocatalytic results showed that the samples synthesized from excess PO_(4)^(3-)solution exhibited higher photocatalytic performance compared to the sample with a Ag^(+)/PO_(4)^(3-)ratio of 3:1.A sample prepared from the precursor solution with a Ag^(+)/PO_(4)^(3-)ratio of 3:1.5 was optimal for RhB decomposition under both visible light and natural sunlight,completely decomposing 10 ppm RhB after 15 minutes of xenon lamp irradiation and after 60 minutes under solar light *** is attributed to the high crystallinity,small particle size and low electron–hole recombination rate of the sample.

关键词： morphology photocatalytic Ag^(+)/PO_(4)^(3-)ratio visible light

Computational Modeling of dual-Phase Ceramics with Finsler-Geometric Phase Field Mechanics

在线全文

学校读者我要写书评

暂无评论

Computer Modeling in Engineering & Sciences 2019年第8期120卷 333-350页

作者： john d.Clayton US ARL Impact Physics BranchAberdeen Proving GroundMD21005-5066USA

A theory invoking concepts from differential geometry of generalized Finsler space in conjunction with diffuse interface modeling is described and implemented in finite element(FE)simulations of dual-phase polycrystalline ceramic *** parameters accounting for fracture and other structural transformations,notably partial dislocation slip,twinning,or phase changes,are dimensionless entries of an internal state vector of generalized pseudo-Finsler *** investigated in computations are a boron carbide-titanium diboride(B4C-TiB2)composite and a diamond-silicon carbide(C-SiC)*** mechanisms-in addition to elasticity and cleavage fracture in grains of any phase-include restricted dislocation glide(TiB2 phase),deformation twinning(B4C and-SiC phases),and stress-induced amorphization(B4C phase).The metric tensor of generalized Finsler space is scaled conformally according to dilatation induced by cavitation or other fracture modes and densification induced by phase *** of pure shear consider various morphologies and lattice *** of microstructure on overall strength of each composite are *** B4C-TiB2,minor improvements in shear strength and ductility are observed with an increase in the second phase from 10 to 18%by volume,suggesting that residual stresses or larger-scale crack inhibition may be responsible for toughness gains reported *** diamond-SiC,a composite consisting of diamond crystals encapsulated in a nano-crystalline SiC matrix shows improved strength and ductility relative to a two-phase composite with isolated bulk SiC grains.

关键词： Micromechanics ceramic composites,Finsler space differential geometry phase field finite elements