A ten-month field research study was meticulously conducted at Robert Moses State Park (RMSP) on the south shore of Long Island, NY. The objective was to determine if aerial phenomena of an unknown nature exist over a...A ten-month field research study was meticulously conducted at Robert Moses State Park (RMSP) on the south shore of Long Island, NY. The objective was to determine if aerial phenomena of an unknown nature exist over a coastal location and to characterize their properties and behaviors. Primary and secondary field observation methods were utilized in this data-centric study. Forensic engineering principles and methodologies guided the study. The challenges set forward were object detection, observation, and characterization, where multispectral electro-optical devices and radar were employed due to limited visual acuity and intermittent presentation of the phenomena. The primary means of detection utilized a 3 cm X-band radar operating in two scan geometries, the X- and Y-axis. Multispectral electro-optical devices were utilized as a secondary means of detection and identification. Data was emphasized using HF and LF detectors and spectrum analyzers incorporating EM, ultrasonic, magnetic, and RF field transducers to record spectral data in these domains. Data collection concentrated on characterizing VIS, NIR, SWIR, LWIR, UVA, UVB, UVC, and the higher energy spectral range of ionizing radiation (alpha, beta, gamma, and X-ray) recorded by Geiger-Müller counters as well as special purpose semiconductor diode sensors.展开更多
Longitudinal twinning α-In2Se3 nanowires with the （10T 8） twin plane were synthesized to fabricate high performance single nanowire based photodetectors. As-synthesized a-In2Se3 nanowire exhibited typical n-type se...Longitudinal twinning α-In2Se3 nanowires with the （10T 8） twin plane were synthesized to fabricate high performance single nanowire based photodetectors. As-synthesized a-In2Se3 nanowire exhibited typical n-type semiconducting behavior with an electron mobility of 23.1 cm2-V1. S-1 and a broadband spectral response from 300 to 1100 nm, covering the ultraviolet-visible-near-infrared （UV-visible-NIR） region. Besides, the fabricated device showed a high responsivity of 8.57 × 10^5 A·W^-1, high external quantum efficiency up to 8.8 × 107% and a high detectivity of 1.58 ×10^12 Jones under 600 nm light illumination at a basis of 3 V, which are much higher than previously reported In2Se3 nanostructures due to the interface defect effect of the twin plane. The results indicated that the longitudinal twinning α-In2Se3 nano- wires have immense potential for further applications in highly performance broadband photodetectors and other optoelectronic devices.展开更多
Silica coated multi-wall carbon nanotubes(MWCNTs),silica@MWCNTs and nanocomposites were synthesized by a sol-gel method.By using the synthesized nanocomposites and also CNTs as templates,silica nanotubes(silica-NTs) w...Silica coated multi-wall carbon nanotubes(MWCNTs),silica@MWCNTs and nanocomposites were synthesized by a sol-gel method.By using the synthesized nanocomposites and also CNTs as templates,silica nanotubes(silica-NTs) were prepared.The optical properties of fabricated nanocomposites and nanotubes were characterized by back-scattering micro Raman,UV/Vis/NIR and FT-IR spectra,which show the presence of CNTs structure in the nanocomposites.UV/Vis/NIR and FT-IR spectra also show the presence of silica compounds.The recorded spectra from UV/Vis/NIR and FT-IR also confirm the presence of silica compounds in the nanotubes.The results of FE-SEM imaging data indicate that the synthesized samples are MWCNTs coated uniformly by silica molecules,which act as the template to synthesize silica-NTs.展开更多
Nowadays the development of Internet of Things （loT） and defense technologies imperatively needs high-performance photodetectors that can work in a broadband wavelength range, in particular, covering the mid-infrar...Nowadays the development of Internet of Things （loT） and defense technologies imperatively needs high-performance photodetectors that can work in a broadband wavelength range, in particular, covering the mid-infrared （MIR） region [1]. This generates great interest in the incorporation of a series of novel optoelectronic materials and structures into the photodetectors. Graphene and colloidal quantum dots （QDs） are key players among novel materials used to fabricate high-performance photodetectors [2-4]. By taking advantage of the high mobility of graphene and excellent tunable optical absorption of colloidal QDs,展开更多
以南疆红枣总酸的快速无损检测为研究对象,利用SPXY(Sample set partitioning based on joint x-y distances)法来划分校正集样本,应用无信息变量消除法(UVE)对南疆红枣总酸近红外光谱(NIRS)特征变量进行筛选,然后用筛选出的变量建立偏...以南疆红枣总酸的快速无损检测为研究对象,利用SPXY(Sample set partitioning based on joint x-y distances)法来划分校正集样本,应用无信息变量消除法(UVE)对南疆红枣总酸近红外光谱(NIRS)特征变量进行筛选,然后用筛选出的变量建立偏最小二乘(PLS)模型,该模型的预测标准偏差(RMSEP)为0.044 7,预测相关系数为Rp为0.877 8,并将UVE筛选的变量建立的PLS模型与全光谱建立PLS模型结果进行比较。结果表明,SPXY法划分的校正集样本合理;UVE优出选全光谱1 557个变量中的420个变量,建立的PLS模型预测效果要好于全光谱建立的PLS模型,UVE能够有效地选取待测成分的特征波长,建立简化的红枣总酸预测模型,降低模型计算量。展开更多
文摘A ten-month field research study was meticulously conducted at Robert Moses State Park (RMSP) on the south shore of Long Island, NY. The objective was to determine if aerial phenomena of an unknown nature exist over a coastal location and to characterize their properties and behaviors. Primary and secondary field observation methods were utilized in this data-centric study. Forensic engineering principles and methodologies guided the study. The challenges set forward were object detection, observation, and characterization, where multispectral electro-optical devices and radar were employed due to limited visual acuity and intermittent presentation of the phenomena. The primary means of detection utilized a 3 cm X-band radar operating in two scan geometries, the X- and Y-axis. Multispectral electro-optical devices were utilized as a secondary means of detection and identification. Data was emphasized using HF and LF detectors and spectrum analyzers incorporating EM, ultrasonic, magnetic, and RF field transducers to record spectral data in these domains. Data collection concentrated on characterizing VIS, NIR, SWIR, LWIR, UVA, UVB, UVC, and the higher energy spectral range of ionizing radiation (alpha, beta, gamma, and X-ray) recorded by Geiger-Müller counters as well as special purpose semiconductor diode sensors.
文摘Longitudinal twinning α-In2Se3 nanowires with the （10T 8） twin plane were synthesized to fabricate high performance single nanowire based photodetectors. As-synthesized a-In2Se3 nanowire exhibited typical n-type semiconducting behavior with an electron mobility of 23.1 cm2-V1. S-1 and a broadband spectral response from 300 to 1100 nm, covering the ultraviolet-visible-near-infrared （UV-visible-NIR） region. Besides, the fabricated device showed a high responsivity of 8.57 × 10^5 A·W^-1, high external quantum efficiency up to 8.8 × 107% and a high detectivity of 1.58 ×10^12 Jones under 600 nm light illumination at a basis of 3 V, which are much higher than previously reported In2Se3 nanostructures due to the interface defect effect of the twin plane. The results indicated that the longitudinal twinning α-In2Se3 nano- wires have immense potential for further applications in highly performance broadband photodetectors and other optoelectronic devices.
文摘Silica coated multi-wall carbon nanotubes(MWCNTs),silica@MWCNTs and nanocomposites were synthesized by a sol-gel method.By using the synthesized nanocomposites and also CNTs as templates,silica nanotubes(silica-NTs) were prepared.The optical properties of fabricated nanocomposites and nanotubes were characterized by back-scattering micro Raman,UV/Vis/NIR and FT-IR spectra,which show the presence of CNTs structure in the nanocomposites.UV/Vis/NIR and FT-IR spectra also show the presence of silica compounds.The recorded spectra from UV/Vis/NIR and FT-IR also confirm the presence of silica compounds in the nanotubes.The results of FE-SEM imaging data indicate that the synthesized samples are MWCNTs coated uniformly by silica molecules,which act as the template to synthesize silica-NTs.
文摘Nowadays the development of Internet of Things （loT） and defense technologies imperatively needs high-performance photodetectors that can work in a broadband wavelength range, in particular, covering the mid-infrared （MIR） region [1]. This generates great interest in the incorporation of a series of novel optoelectronic materials and structures into the photodetectors. Graphene and colloidal quantum dots （QDs） are key players among novel materials used to fabricate high-performance photodetectors [2-4]. By taking advantage of the high mobility of graphene and excellent tunable optical absorption of colloidal QDs,
文摘以南疆红枣总酸的快速无损检测为研究对象,利用SPXY(Sample set partitioning based on joint x-y distances)法来划分校正集样本,应用无信息变量消除法(UVE)对南疆红枣总酸近红外光谱(NIRS)特征变量进行筛选,然后用筛选出的变量建立偏最小二乘(PLS)模型,该模型的预测标准偏差(RMSEP)为0.044 7,预测相关系数为Rp为0.877 8,并将UVE筛选的变量建立的PLS模型与全光谱建立PLS模型结果进行比较。结果表明,SPXY法划分的校正集样本合理;UVE优出选全光谱1 557个变量中的420个变量,建立的PLS模型预测效果要好于全光谱建立的PLS模型,UVE能够有效地选取待测成分的特征波长,建立简化的红枣总酸预测模型,降低模型计算量。
