High quantum efficiency long-/long-wave dual-color type-Ⅱ InAs/GaSb infrared detector

A long-/long-wave dual-color detector with N-M-π-B-π-M-N structure was developed based on a type-Ⅱ InAs/GaSb superlattice. The saturated responsivity was achieved under low bias voltage for both channels. The device could be operated as a single detector for sequential detection and showed high quantum efficiencies. The peak quantum efficiencies of long-wavelength infrared band-1(blue channel) and long-wavelength infrared band-2(red channel) were 44% at 6.3 μm under 20 mV and 57% at 9.1 μm under-60 mV, respectively. The optical performance for each channel was achieved using a 2 μm thickness absorber. Due to the high QE, the specific detectivities of the blue and red channels reached5.0×10^(11) cm·Hz^(1/2)/W at 6.8 μm and 3.1×10^(11) cm·Hz1^(1/2)/W at 9.1 μm, respectively, at 77 K.

Effect of Nanorod Diameters on Optical Properties of GaN-Based Dual-Color Nanorod Arrays

Dual-color(blue and green) InGaN/GaN nanorod light-emitting diodes(LEDs) with three different nanorod diameters are fabricated. Enhancement of luminescence intensity per area is observed in blue and green wells,to varying degrees. When the diameter is 40 nm, it sharply decreases, which could be explained by the sidewall nonradiative recombination. Time-resolved photoluminescence is conducted to study the carrier lifetime. High recombination rate is observed in nanorod arrays, and is an order of magnitude less than that of the planar LED.When the diameter is 40 nm, the nonradiative lifetime decreases, and this explains the decrease of intensity. The3 D-FDTD simulations show the enhancement of light extraction out of geometry structure by calculating the transmittance of the nanorod arrays.

Fusion of clathrin and caveolae endocytic vesicles revealed by line-switching dual-color STED microscopy

Clathrin-and caveolae-mediated endocytosis are the most commonly used pathways for the internalization of cell membrane receptors.However,due to their dimensions are within the diffraction limit,traditional fluorescence microscopy cannot distinguish them and little is known about their interactions underneath cell membrane.In this study,we proposed the line-switching scanning imaging mode for dual-color triplet-state relaxation(T-Rex)stimulated emission depletion(STED)super-resolution microscopy.With this line-switching mode,the cross-talk between the two channels,the side effects from pulse picker and image drift in frame scanning mode can be effectively eliminated.The dual-color super-resolution imaging results in mixed fluorescent beads validated the excellent performance.With this super-resolution microscope,not only the ring-shaped structure of clathrin and caveolae endocytic vesicles,but also their semi-fused structures underneath the cell membrane were distinguished clearly.The resultant infor-mation will greatly facilitate the study of clathrin-and caveolae-mediated receptor endocytosis and signaling process and also our home-built dual-color T-Rex STED microscope with this line-switching imaging mode provides a precise and convenient way to study subcellular-scale protein interactions.

Field-free molecular orientation induced by combined femtosecond single-and dual-color laser pulses: The role of delay time and quantum interference

The coherent control of field-free molecular orientation of CO with combined femtosecond single- and dual-color laser pulses has been theoretically studied. The effect of the delay time between the femtosecond single- and dual-color laser pulses is discussed, and the physical mechanism of the enhancement of molecular orientation with pre-alignment of the molecule is investigated. It is found that the basic mechanism is based on the creation of a rotational wave packet by the femtosecond single-color laser pulse. Furthermore, we investigate the interference between multiple rotational excitation pathways following pre-alignment with femtosecond single-color laser pulse. It is shown that such interference can lead to an enhancement of the orientation of CO molecule by a factor of 1.6.

汽车激光雷达盖板的双色注塑模具设计

根据某车型激光雷达盖板的双色结构及形状,采用动模型芯旋转式结构的模具方案,设计了一套一出二的热流道双色注塑模具。利用Moldflow软件进行了双色成型分析,双色注塑第一次注射成型透明的PMMA材料的产品,第二次注射成型黑色ASA材料的产品。为实现该双色产品的结构成型,在定模处设计了2组不同结构的型腔,在动模处设计了2组左右对称的型芯,并且,在型芯侧设计了双斜导柱抽芯机构,冷却系统设计为“直通式+隔水片”的随形循环水路;顶出系统设计为2组独立的液压油缸,在产品顶出取件中,第一次注射成型的PMMA产品不顶出,第二次注射成型的ASA材料的产品采用“直顶+斜顶”的组合机构将双色产品推出,最终通过机械手完成产品的取件。实践生产证明了该双色模具结构合理、运行稳定、成型的双色塑件表面无缺陷。

基于双参考优化的壁画图像色彩还原

褪变色壁画图像的色彩还原研究可以促进壁画的保护和展示。壁画图像色彩还原旨在将退化壁画图像的色彩褪变区域还原为原有色彩。常规的基于单幅参考壁画图像的色彩还原方法难以选取与退化壁画图像相似的参考壁画图像,进而影响色彩还原质量。为此,提出一种基于双参考优化的壁画图像色彩还原方法。采用双参考策略,即使用2幅参考壁画图像对退化壁画图像进行色彩还原,利用图像优化模块抑制褪变色壁画图像中普遍存在的噪声、划痕等多重退化,通过编码器-解码器网络编码提取壁画图像多尺度特征,并构建特征融合模块优化壁画图像的多尺度特征。采用双参考指导模块计算参考壁画图像与退化壁画图像的语义对应置信度,以实现图像区域间的相似性匹配,并实现2幅参考壁画图像的风格融合。在此基础上,利用融合特征实现退化壁画图像的色彩还原。实验结果表明,该方法可以较准确地还原退化壁画图像色彩,同时能较好保持壁画图像原有的边缘结构信息,并且使用无参考图像质量评估指标对各个方法的还原壁画图像进行客观评估,与对比方法相比,该方法在客观评估指标上最多可降低12.2%。

Gram-scale synthesis of all-inorganic perovskite quantum dots with high Mn substitution ratio and enhanced dual-color emission

Mn-doped all-inorganic perovskite quantum dots (QDs) provide prominent applications in the fields of low-cost light source or display,because of their remarkable properties including dual-color emission and reduced lead content,as well as high photoluminescence quantum yields (PLQYs) and high stability.However,the existing synthesis approaches usually require hash conditions,such as high temperature and nitrogen protection,which is a major hurdler for the practical manufacturing.In addition,the significantly high Mn substitution ratio in CsPbX3 QDs is still challenging.The real dual-color emission with two strong emission peaks in the Mn-doped all-inorganic perovskite QDs has attracted great interest.Here we present a gram-scale approach to synthesize both CsPbxMn1-xCI3 and CsPb1-xMnxClyBr3-y QDs at 100 ℃ in the air with high Mn substitution ratio,up to 55.64% atomically.The as-prepared CsPb1-xMnxClyBr3-y QDs exhibit high PLQYs of 62.41% and dual-color emission with two strong emission peaks around at 400-450 nm and 600 nm,respectively.The enhanced peak at 400-450 nm is a result of the hybrid halides in CsPbBrxCl3-x host.Furthermore,the unique advantage of the optical emission and high PLQYs properties of the CsPbxMn1-xCl3 QDs has been demonstrated as invisible ink for encryption applications and polymer composites.Our gram-scale synthesis approach for Mn-doped all-inorganic perovskite QDs may boost the future research and practical applications of QDs-based white LED,spintronics,and molecular barcoding.

Silicon carbide and graphene based UV-IR dual-color detector

An ultraviolet-infrared dual-color detector is proposed and realized based on the vertical integration of single-layer graphene and a 4 H-SiC layer by semiconductor micro-fabrication technology. The spectral response characteristics of the detector are analyzed. The ultraviolet response range is 208—356 nm with a responsivity larger than 0.4 mA/W and the infrared response range is 1.016—1.17 μm with a responsivity larger than 0.4 mA/W at room temperature and 5 V bias voltage. The peak responsivity of the graphene in the ultraviolet-C band at 232 nm is 0.73 mA/W and in the near infrared band at 1.148 μm is 0.64 mA/W. The peak responsivity of SiC layer in the ultraviolet-B band at 312 nm is 2.27 mA/W. Besides, the responsivity increases with the bias voltage.

基于双参考帧的多源着色结果融合的视频着色方法

对黑白视频着色时,为了更好地利用参考帧信息,提出一种基于双参考帧的多源着色结果融合的着色方法.首先,采用硬注意力融合子模块融合双参考帧提供的颜色信息,以防止双帧语义匹配模块着色时不合理参考信息导致的颜色模糊问题.然后,使用多源着色结果融合模块融合通过双帧光流传播模块、双帧语义匹配模块以及遮挡信息得到的着色结果,进而产生更优质的着色结果.实验结果表明,该方法在Davis30测试集上的峰值信噪比(PSNR)、结构相似性(SSIM)和颜色分布一致性指数(CDC)分别为37.36 dB、0.980 5、0.003 748,说明该方法能够通过多种融合方式充分利用双参考帧的信息为灰度帧着色,并生成美观且具有较好时间一致性的着色结果.

医用电子检测仪支架双色成型模具设计

设计了1副双色注塑模具用于某医用电子检测仪支架双色塑件的成型。依据塑件不同材料不同颜色的生产要求,第一射基础件选用聚碳酸酯(PC)成型,第二射插片体选用PC/丙烯腈-丁二烯-苯乙烯塑料(ABS)成型,第二射材料熔体温度比第一射材料低35℃,确保第二射成型能顺利进行。在分别制定了第一射、第二射成型工艺的基础上,设计了塑件成型的双色模具,双色模具采用旋转式结构,由两副子模具构成,两副子模具都采用两板式模具,浇注系统都采用冷流道+热嘴形式。针对有滑块机构的双色模具在第二射成型时易产生飞边问题,设计了一种双色模具三角截面斜导柱第一射免抽芯滑块机构,在该机构中,通过将常用圆柱形斜导柱改进为三角截面斜导柱、增设弹销,以及将斜导柱孔改进为“U形槽”等措施,使第一射成型时侧抽芯滑块免于侧抽芯,从而确保了第二射子模具模腔封闭的严密性,将塑件的成型品质合格率提高到99%以上。

Donor-conformation-dependent energy transfer for dual-color fluorescent probe with high-resolution imaging

Herein,we presented a brand-new concept to construct the Forster resonance energy transfer(FRET)based cassette by integrating a vibration-induced emission(VIE)chromophore as the donor.Different from traditional donors only with a single emission,the VIE donor possessed well-separated dual emission bands by altering the excited state molecular configuration from the bent state to the planar state.By linking an acceptor such as a cyanine dye(Cy5),a novel VIE-FRET cassette(PPCy5)was prepared.The planar emission profile of the VIE donor moiety could fully cover the absorption of Cy5,and thus the complete FRET process enabled the excellent bimodal spectra difference of 142 nm and ultra-large pseudo-Stokes shift of up to 300 nm.Benefiting from the viscosity-dependent characteristic of the VIE donor,PPCy5 could clearly and intuitively reveal the different viscosity regions in vivo by dual-color and high-resolution imaging.The VIE-FRET paradigm provides an optional platform for developing donor-acceptor-based dual-color fluorescent probes with high-resolution imaging ability.

A TICS-fluorophore based probe for dual-color GSH imaging

Cascading reactions in fluorophores accompanied by the replacement of different fluorescence wavelengths can be used to develop luminescent materials and reactive fluorescent probes.Based on multiple signal channels,the selectivity of probes can be improved and the range of response to guest molecule recognition can be expanded.By regulating the position,number,and activity of active sites in fluorophores,fluorescent probes that successively react with thiol and amino groups in cysteine(Cys),homocysteine(Hcy)have been developed,which can only react with the thiol group of GSH,In this paper,we report the first probe capable of cascading nucleophilic substitution reaction with the thiol group and amino group of GSH at a single reaction site,and showed the dual-color recognition of GSH,which improved the selectivity of GSH also was an extension of GSH probes.The probe Rho-DEA was based on a TICS fluorophore,and the intramolecular cascade nucleophilic substitution reaction occurs with Cys/Hcy.The thiol substitution of the first step reaction with Cys/Hcy was quenched due to intersystem crossing to triplet state,so GSH can be selectively recognized from the fluorescence signal.Rho-DEA has the ability of mitochondrial localization,and finally realized in situ dual-color fluorescence recognition of GSH in mitochondria.

Ultraviolet-infrared dual-color photodetector based on vertical GaN nanowire array and graphene

A monolithic integrated ultraviolet-infrared(UV-IR) dual-color photodetector based on graphene/GaN heterojunction was fabricated by vertically integrating a GaN nanowire array on a silicon substrate with monolayer graphene. The device detects UV and IR lights by different mechanisms. The UV detection is accomplished by the forbidden band absorption of GaN, and the IR detection is realized by the free electron absorption of graphene. At peak wavelengths of 360 nm and 1540 nm, the detector has responsivities up to 6.93 A/W and 0.11 A/W, detection efficiencies of 1.23 × 1012 cm·Hz1/2·W-1 and 1.88 × 1010 cm·Hz1/2·W-1, respectively,and a short response time of less than 3 ms.

面向全色域转杯纺纱的Kubelka-Munk双常数理论模型构建及颜色预测

为了能在色纺纱的纺纱阶段即时调控纱线颜色,减少混色成本,缩短工艺流程,结合三通道数控转杯纺纱的特点构建了全色域网格化混色模型,该模型可在纺纱过程中进行全色域范围内的色相调控、明度调控和彩度调控。为了解决色纺纱的测配色问题,得到与之相匹配的测配色系统,根据来样快速进行计算机测配色,节约成本,结合传统Kubelka-Munk双常数理论模型的特点,从构建的全色域网格化混色模型中选取混合样来进行颜色预测。从传统Kubelka-Munk双常数理论模型颜色预测的结果发现,部分混合样的预测反射率明显低于实际的反射率,针对这个问题,重新构建了新的Kubelka-Munk双常数理论模型来进行颜色预测得到新的预测反射率,并用插值替换的方法,把传统Kubelka-Munk双常数理论模型预测结果中明显低于实际反射率的部分用新的预测反射率替换,得到最终的混合样预测反射率。结果表明:与传统的Kubelka-Munk双常数理论模型预测混合样颜色结果相比,新的Kubelka-Munk双常数理论模型预测颜色并用插值替换法替换后得到的最终的混合样的颜色,色差平均值从1.48降低到1.04,且所有混合样的色差均能控制在2.0以内。该预测方法较传统Kubelka-Munk双常数理论模型具有更好的预测精度,所构建的全色域网格化混色模型和新的Kubelka-Munk双常数理论模型可应用于多基色纤维混色色彩和混合比的预测。

光刺激颜色和模式变化对脑电α波同步影响规律

针对α波同步和刺激颜色是否相关,提出用双眼同频和双眼双频刺激模式,频率在低频(f_(I)±3)Hz、中频(2f_(I)±3)Hz和高频(4f_(I)±3)Hz取值(颜色取红、绿、蓝,f_(I)为α波自发频率),以归一化香农熵为评价α波同步程度指标,研究刺激模式和颜色组合变化对α波同步影响。结果表明:在低、中或高频段内,在双眼双频或双眼同频模式下,无论是红、绿或蓝光刺激,α波相位同步程度随刺激频率变化均呈“阿诺德舌头”形状,且红色>绿色>蓝色(同步程度);在双眼双频及不同颜色光作用下,一只眼刺激频率改变,则另一只眼的α波同步受到影响。该结果为认知障碍疾病诊断和治疗新方法研究提供新思路,刺激频率、颜色和模式组合可解决脑机接口技术的刺激频率选择局限性问题。

2023中国舞台影视灯光调研分析报告——常规灯具·特效器篇

阐述影响常规灯具光质的因素,其中LED混色光源在光谱和色域方面的优势,以及智能色彩校正系统帮助灯具实现高显色性、稳定性、一致性。灯具光学系统和灯具结构的优化对满足更广泛的应用提供了可能。归纳常规灯具的需求化应用。特效器的创新应用。

Clinical,cytogenetic and dual-color FISH studies on five cases of myelodysplastic syndrome or acute myeloid leukemia patients with 1;7 translo cation

To study the clinical and cytogenetic characteristics of four patients with myel odysplastic syndrome (MDS) and one with acute myeloid leukemia experiencing t(1; 7) Methods Five patients seen in our hospital from 1992 to 2001 were diagnosed as MDS and acute myelocytic leukemia (AML) according to the French American British (FAB) criteria Chromosomes were prepared using the direct method as well as 24 hou r unstimulated cultures of fresh heparinized bone marrow for each subject, while R banding was used to analyze karyotypes Dual color fluorescence in situ hy bridization (FISH) using SpectrumRed and SpectrumGreen directly labeled chromoso me 1 specific α satellite DNA probe (red) and chromosome 7 specific α sat ellite DNA probe (green) was performed for three cases Results Of the five patients, three had 1;7 translocation due to a long history of expos ure to benzene In three cases, dual color FISH resulted in three red signals and two green ones, in which one red signal adjoining one green signal in 27 6% , 84% and 18 5% metaphases, respectively Conclusions Exposure to benzene may be the cause for Chinese MDS and AML patients with t(1;7 ) translocation The result of dual color FISH convincingly confirmed that the centromere of the derivative chromosome 7p/1q resulting from 1;7 translocation was made up of centromeres from both chromosomes 1 and 7

双能CT联合彩色多普勒超声诊断宫颈癌淋巴结转移的临床价值

目的:探讨双能CT参数联合彩色多普勒超声(彩超)对宫颈癌盆腔淋巴结转移的诊断价值。方法:选择2019年6月-2022年6月在本院确诊的155例宫颈癌患者临床资料,根据病理诊断是否发生盆腔淋巴结转移分为未转移组108例和转移组47例。分析患者双能CT参数及彩超表现特征,评价双能CT参数联合彩超对宫颈癌盆腔淋巴结转移的诊断效能。结果:转移组47例中,彩超诊断宫颈癌淋巴结转移41例(87.2%),表现为类圆形或融合状不规则形,内部均匀低回声,可见丰富的点、条状血流信号,RI值较低;未转移组108例中,彩超诊断未发生淋巴结转移86例(79.6%),未见明显占位性病变,内部呈回声、稍低回声,血流不丰富,RI值较高。155例宫颈癌患者病灶内部CT表现为低回声、不均匀,多数边缘不规则,部分内部可见钙化灶,淋巴结呈圆形或椭圆形,边缘模糊,强化明显,中心呈低密度。转移组动、静脉期双能CT定量参数λHU、NIC、IC均高于未转移组(P<0.05);λHU、NIC、IC诊断宫颈癌淋巴结动脉期转移的曲线下面积(AUC)动脉期(0.831、0.818、0.836)略高于静脉期(0.800、0.772、0.721),彩超诊断宫颈癌淋巴结转移的AUC为0.834,灵敏度87.2%、特异度79.6%,动脉期λHU、NIC、IC联合彩超诊断宫颈癌淋巴结转移的AUC为0.963,灵敏度93.6%、特异度89.8%,联合诊断效能高于单独检测(P<0.05)。结论:动脉期双能CT参数联合彩超对宫颈癌盆腔淋巴结转移有较高的诊断价值。

InAs/GaSbⅡ类超晶格双色红外焦平面器件的干法刻蚀与湿法腐蚀制备对比研究

分别采用干法刻蚀工艺路线和湿法腐蚀工艺路线制备了面阵规模为320×256、像元中心距为30μm的InAs/GaSbⅡ类超晶格长/长波双色红外焦平面器件,并对其台面形貌、接触孔形貌、伏安特性以及互连读出电路并封入杜瓦后的中测性能进行了对比研究。总结了采用干法工艺和湿法工艺制备双色InAs/GaSbⅡ类超晶格焦平面器件的特点。该研究对InAs/GaSbⅡ类超晶格焦平面器件的研制具有参考意义。

柴油双喷射撞击喷雾和燃烧可视化研究

利用高速相机基于纹影法获取上置喷油器和侧置喷油器在单独喷射和垂直喷射状态下的喷雾和燃烧火焰发展图像。柴油喷射压力设置为80、120、140 MPa,环境背压设置为4 MPa,环境温度在喷雾和燃烧研究中分别设置为500 K和800 K。结果表明:随着喷射压力的增加,不管是单独喷射还是垂直喷射,喷雾贯穿距和面积均增大;垂直喷射状态下,两油束碰撞后损失部分能量,导致其喷雾面积小于两单独喷射状态下的喷雾面积之和。采用双色法研究不同工况下燃料燃烧特性,结果表明:在喷射后1.50~3.50 ms的燃烧稳定时期内,随着喷油压力的提高,各喷射状态下的火焰面积均增大,燃烧温度提高,碳烟生成量降低;垂直喷射状态下的火焰面积小于两单独喷射状态下的火焰面积之和,燃烧温度和碳烟生成量均高于两单独喷射状态。