搜索结果: 1-15 共查到“工学 NIR”相关记录45条 . 查询时间(0.065 秒)
结直肠癌是全球发病率和死亡率都位居前列的恶性肿瘤，手术是结直肠癌治疗的主要方式，完全切除肿瘤 (R0) 与更好的总生存期和更低的复发率相关。然而，进展期结直肠癌具有较高的不完全切除率，缺乏实时的术中影像技术来辅助外科医生区分恶性和良性组织，R0 切除在许多患者中仍然具有挑战性。近红外二区（near-infrared window II，NIR-II）荧光分子成像是一种崭新的成像技术，具有灵敏度高、...
双金属协同策略合成NIR-II吸收的碳龙配合物（图）
双金属 NIR-II 碳龙配合物 Figure 1
2023/6/21
近日，夏海平教授/林玉妹副教授等在“碳龙化学”的结构创新和性能拓展等方面取得新进展：首次合成了吸收光谱达到NIR-II（近红外二区）的 “碳龙配合物”。相关成果以“Condensed Osmaquinolines with NIR-II Absorption Synthesized by Aryl C-H Annulation and Aromatization”为题在线发表于Angew. Che...
为解决初烤烟叶收购中人工分级主观因素影响较大的问题，提出了一种基于近红外（NIR）光谱技术结合极限学习机（ELM）算法自动鉴别烟叶等级的方法。文章首次提出基于品质相似、价格接近原则的烟叶收购分组方法，通过交互检验优化ELM分组、分级模型的隐节点数，并与K最近邻法（KNN）、支持向量机（SVM）和随机森林（RF）等多分类算法进行了比较。结果表明：ELM分类模型参数自动优化、训练时间短、稳定性和预测能...
CALIBRATION OF LOW COST RGB AND NIR UAV CAMERAS
calibration non-metric camera calibration tests GRD GSD low-cost cameras
2016/7/5
Non-metric digital cameras are being widely used for photogrammetric studies. The increase in resolution and quality of images obtained by non-metric cameras, allows to use it in low-cost UAV and terr...
UAS BASED TREE SPECIES IDENTIFICATION USING THE NOVEL FPI BASED HYPERSPECTRAL CAMERAS IN VISIBLE,NIR AND SWIR SPECTRAL RANGES
UAS Hyperspectral Photogrammetry SWIR Tree Species
2016/7/5
Unmanned airborne systems (UAS) based remote sensing offers flexible tool for environmental monitoring. Novel lightweight Fabry-Perot interferometer (FPI) based, frame format, hyperspectral imaging in...
MAPPING OF FOLIAR CONTENT USING RADIATIVE TRANSFER MODELING AND VIS-NIR HYPERSPECTRAL CLOSE-RANGE REMOTE-SENSING
Close-range remote sensing Hyperspectral Leaf optical properties Radiative transfer model Vegetation
2015/9/21
Most methods for retrieving foliar content from hyperspectral data are well adapted either to remote-sensing scale, for which each spectral measurement has a spatial resolution ranging from a few doze...
Using spectral information at the nir water absorption features to estimate canopy water content and biomass
Vegetation Canopy water content Biomass
2015/8/20
Biomass is one of the key biophysical variables of interest in vegetation studies and it can be defined in terms of fresh matter weight
or dry matter weight. Biogeochemical processes, such as photosy...
Prediction of Total Phenolics and Flavonoids Contents in Chinese Wild Rice (Zizania latifolia) Using FT-NIR Spectroscopy
Total Phenolics Flavonoids Contents
2016/6/2
Total phenolics and flavonoids contents in Chinese wild rice were predicted using Near Infrared (NIR) spectroscopy as a rapid method. A Partial Least Square (PLS) algorithm was applied to perform the ...
利用900~1700 nm近红外高光谱成像系统对冷鲜羊肉嫩度进行快速无损检测研究。采集冷鲜羊肉(1~8 d)表面的高光谱散射图像,提取样本感兴趣区域反射光谱曲线并用剪切力值表征冷鲜羊肉的标准嫩度。以原始光谱、特征区域光谱和Savitzky-Golay卷积平滑预处理光谱建立冷鲜羊肉嫩度的偏最小二乘回归(PLSR)模型,预处理的特征区域光谱建立的模型效果更优。结果表明:特征区域光谱可有效替代全波段光谱...
Preliminary study using visible and SW-NIR analysis for evaluating the loss of freshness in commercially packaged cooked ham and Turkey ham
spectroscopy hyperspectral camera storage time cold meat
2014/8/11
A non-destructive Vis-NIR spectroscopy (400–1000 nm) method was developed to evaluate the loss of freshness of sliced and commercially packaged cooked ham and turkey ham without any sample manipulatio...
Method for Improving the Lateral Resolution of Near-Infrared (NIR) Single Optods: Application to Subcutaneous Vein Detection and Localization
Reflectance Measurements Photon Migration Optical Diagnosis Fiber Probe Design
2013/1/30
NIR backscattering measurements using single source-detector optical probe (optods) can detect absorption areas within deep tissue layer. However, such optods, are characterized by large separation di...
DO ADDITIONAL BANDS (COASTAL, NIR-2, RED-EDGE AND YELLOW) IN WORLDVIEW-2 MULTISPECTRAL IMAGERY IMPROVE DISCRIMINATION OF AN INVASIVE TUSSOCK, BUFFEL GRASS (CENCHRUS CILIARIS)?
Buffel grass multispectral imagery
2014/4/30
Our goals is to determine if Worldview-2 8-band multispectral imagery can be used to discriminate an invasive grass species namely, Buffel grass (Cenchrus ciliaris) in the subtropical arid parts of ce...
VIS/NIR高光谱成像在中国云冈石窟砂岩风化状况分布研究中的进展
高光谱 云冈石窟 粉状风化
2012/4/11
云冈石窟大部分雕凿在长石石英砂岩上，因受环境、岩性等因素影响，目前风化状况严重，其中主要为粉状风化。基于高光谱成像技术研究云冈石窟砂岩风化状况的整体有效评估方式，采集目标物400～1 000 nm的高光谱数据，采用对数残差法进行归一化处理，参照归一化处理后的反射率数据，按照这区间的反射率分布范围将风化程度分为强风化和弱风化。同时在envi平台下对砂岩的风化状况分布进行分级可视化表述。将可视化结果与...
基于舌诊NIR反射光谱血清总蛋白含量的无创测量
近红外反射光谱 舌诊 血清总蛋白(TP) BP神经网络 偏最小二乘(PLS)
2012/8/17
采用舌诊近红外反射光谱对人体血清总蛋白(TP)含量进行无创检测。采集58例舌尖反射光谱进行反射率归一化并记录相对应的血清总蛋白生化分析值，将样本分为训练集和预测集，运用主成分分析结合BP神经网络法和偏最小二乘算法分别建立预测模型。主成分分析结合BP神经网络模型对预测集进行预测，平均相对误差为7.35%，均方根误差为3.069 1 g·L-1，相关系数为0.902 1。偏最小二乘模型对预测集进行预测...
High Refractive Index Bi2O3-B2O3-TeO2 Glass with High Visible-NIR Transmittance
Fiber materials Optical properties
2015/6/4
We have newly developed Bi 2 O 3 -B 2 O 3 -TeO 2 glass system. This glass shows high transmittance in visible and near-IR wavelength, in spite of their high refractive index and optical nonlinearity.