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高光谱图像Pareto优化稀疏解混
高光谱图像 稀疏解混 Pareto优化
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2018/3/7
高光谱解混是学术界的一个难题，稀疏高光谱解混指的是利用已知光谱库进行解混，旨在从先验光谱库中找到一些可以表征图像的数个纯光谱向量作为高光谱图像的端元，并利用这些端元求解相应的端元丰度，这是一个NP难的组合优化问题。目前多通过将L0范数凸松弛为L1范数进行稀疏解混，但该方法得到的仅仅是近似解。文中提出了一种基于Pareto优化的稀疏解混算法（ParetoSU），将稀疏解混问题转化为一个两目标优化问题...
Y2O3:Eu3+,Dy3+纳米荧光粉的白光发射性能
激发光谱 发射光谱 白光 能量传递
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2019/1/17
采用高温固相烧结法制备了系列Dy单掺杂、Eu，Dy共掺杂和Sr，Eu，Dy共掺杂的Y2O3纳米荧光粉.借助X射线衍射仪（XRD）和扫描电子显微镜（SEM）分析了样品的晶体结构和形貌，优化了工艺过程和参数.系统测试了稀土掺杂Y2O3荧光粉的激发光谱和发射光谱.在330 nm光激发下，研究了Y2O3∶Eu3+，Dy3+纳米荧光粉的白光发射特性，并通过调节Eu，Dy掺杂浓度，获得了CIE为（0.32，0...
STATE OF ARTS OF MONUMENTAL STONES DIAGNOSIS AND MONITORING
Portable diagnostic tools Imaging techniques Spectroscopy techniques Moisture content Salt content Biodeterioration Hardness Scheduled maintenance
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2017/8/31
The conservation and maintenance of a monumental stone building is a complex aim where different disciplines are involved. First step is concerning the determination of the state of conservation of st...
Colocalization of the Ganglioside GM1 and Cholesterol Detected by Secondary Ion Mass Spectrometry
Cholesterol G(M1) Ganglioside Lipid Bilayers Spectrometry, Mass, Secondary Ion Molecular Conformation Biological Transport Microtechnology Nanotechnology Models, Molecular
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2016/5/25
The characterization of the lateral organization of components in biological membranes and the evolution of this arrangement in response to external triggers remain a major challenge. The concept of l...
Solvent-Induced Infrared Frequency Shifts in Aromatic Nitriles are Quantitatively Described by the Vibrational Stark Effect
Nitriles Spectroscopy,Fourier Transform Infrared Vibration Static Electricity Solvents
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2016/5/25
The physical properties of solvents strongly affect the spectra of dissolved solutes, and this phenomenon can be exploited to gain insight into the solvent-solute interaction. The large solvatochromic...
Do Ligand Binding and Solvent Exclusion Alter the Electrostatic Character within the Oxyanion Hole of an Enzymatic Active Site
Pseudomonas putida Thiocyanates Anions Oxygen Steroid Isomerases Ligands Spectroscopy, Fourier Transform Infrared Kinetics Binding Sites Static Electricity
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2016/5/24
The thousands of enzyme structures solved to date have consistently revealed that biological catalysis occurs within sequestered pockets containing complex interdigitations of polar and hydrophobic gr...
Antibody Evolution Constrains Conformational Heterogeneity by Tailoring Protein Dynamics
flexibility nonlinear spectroscopy fluorscein molecular recognition
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2016/5/24
The evolution of proteins with novel function is thought to start from precursor proteins that are conformationally heterogeneous. The corresponding genes may be duplicated and then mutated to select ...
Electric Fields at the Active Site of an Enzyme:Direct Comparison of Experiment with Theory
Humans Nitriles Enzyme Inhibitors Spectrophotometry, Infrared Spectrum Analysis Circular Dichroism Electricity Protein Conformation Protein Structure,Tertiary Protein Folding
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2016/5/24
The electric fields produced in folded proteins influence nearly every aspect of protein function. We present a vibrational spectroscopy technique that measures changes in electric field at a specific...
Supported Membrane Composition Analysis by Secondary Ion Mass Spectrometry with High Lateral Resolution
cryosolvents sugar glass glycerol water trytophan indole IR flourescence phosphorescence
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2016/5/24
The lateral organization of lipid components within membranes is usually investigated with fluorescence microscopy, which, though highly sensitive, introduces bulky fluorophores that might alter the b...
Probing Excited-State Electron Transfer by Resonance Stark Spectroscopy:4.Mutations near BL in Photosynthetic Reaction Centers Perturb Multiple Factors that Affect BL/fBL+HL
Excited-State Electron Transfer Resonance Stark Spectroscopy Mutations near BL Photosynthetic Reaction Centers Perturb Multiple Factors BL/fBL+HL
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2016/5/24
Stark spectra have been obtained in the region of absorption by the accessory bacteriochlorophylls (the B-band region around 800 nm) in Rhodobacter sphaeroides reaction centers. The Stark spectra in t...
Probing Excited-State Electron Transfer by Resonance Stark Spectroscopy:3.Theoretical Foundations and Practical Applications
contracted basis Lanczos algorithm methane vibrational spectroscopy
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2016/5/24
Resonance Stark effects are nonclassical Stark effects associated with excited-state charge-transfer processes. The theory of resonance Stark effects developed in Part 2 of this series is generalized ...
FTIR and Resonance Raman Studies of Nitric Oxide Binding to H93G Cavity Mutants of Myoglobin
Animals Nitric Oxide Imidazoles Myoglobin Enzyme Inhibitors Free Radical Scavengers Spectroscopy, Fourier Transform Infrared Spectrum Analysis, Raman Binding Sites Molecular Structure
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2016/5/23
Nitric oxide (NO) binds to the myoglobin (Mb) cavity mutant, H93G, forming either a five- or six-coordinate Fe-NO complex. The H93G mutation eliminates the covalent attachment between the protein and ...
Analysis of Noise for Rapid-Scan and Step-Scan Methods of FT-IR Difference spectroscopy
Noise Rapid-Scan Step-Scan Methods FT-IR Difference spectroscopy
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2016/5/23
Quantitative vibrational difference spectroscopy of small signals requires techniques that minimize spectral noise. As simple modulation of the sample followed by signal demodulation is often problema...
Vibrational Stark Spectroscopy of NO Bound to Heme:Effects of Protein Electrostatic Fields on the NO Stretch Frequency
rare earth alloys X-ray diffraction crystal structure phase diagram
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2016/5/23
The vibrational Stark effect measures the effect of an external electric field on the vibrational (IR) spectrum of a molecule. This technique gives quantitative information on the sensitivity of a vib...
Stark Effect Spectroscopy of the Heme Charge Transfer Bands of Deoxymyoglobin
materials science electronic structure oxygen compounds myoglobin charge transport stark effect absorption spectra spectroscopy heme protoporphyrins
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2016/5/23
We report the Stark spectra of the Soret, Q, and charge-transfer bands of deoxymyoglobin. The data show that band III has charge-transfer character but that the magnitude of the charge displacement is...