The backward interval partial least squares(Bi PLS)and the synergy interval partial least squares(Si PLS)were applied to select the characteristic spectral regions representing the germination rate of 84 wheat seeds a...The backward interval partial least squares(Bi PLS)and the synergy interval partial least squares(Si PLS)were applied to select the characteristic spectral regions representing the germination rate of 84 wheat seeds and build the near infrared(NIR)quantitative analysis model of wheat seed germination rate.Results from comparison showed that the models built by two variable selection methods had better predictive ability than full-spectral partial least squares(PLS)model.The optimal model was obtained by Si PLS with the calibration and prediction correlation coefficient(R)at 0.902 and 0.967 respectively,and ratio of performance to standard deviate(RPD)at 3.75.Based on this,the physical chemistry significance of characteristic spectral regions was analyzed.The characteristic spectral of wheat seed germination rate contained characteristic peaks of water,protein,starch,fiber,which were the internal nutrients of the seed that influence the germination ability,thus explaining the mechanism of measuring wheat seed germination rate using NIR to a certain extent.展开更多
A convenient and large-scale preparation of retinoic acid 1 from β-ionone in five steps with 38% overall yield is described. The key steps are the epoxidization of 2 with a new methylated agent and the condensation ...A convenient and large-scale preparation of retinoic acid 1 from β-ionone in five steps with 38% overall yield is described. The key steps are the epoxidization of 2 with a new methylated agent and the condensation 4 with tetraethyl methylenediphophonate in one-pot procedure to prepare 6.展开更多
Once dismissed as a drawback in optical processing,low coherence of light is now gaining renewed attention,as recent studies reveal that harnessing optical coherence can unlock enhanced capabilities in information pro...Once dismissed as a drawback in optical processing,low coherence of light is now gaining renewed attention,as recent studies reveal that harnessing optical coherence can unlock enhanced capabilities in information processing.Despite ongoing efforts,a persistent challenge remains:the coherence of light degrades significantly under beam propagation,causing information loss and limiting the feasibility of secure remote transmission.This work presents a coherence-weight-based scheme for remote image transport where the confidential image is encoded into the coherence weights of a partially coherent beam whose statistical structure is preserved during free-space propagation.At the receiver,the original image is successfully reconstructed from the characteristic function—cross-spectral density function of the transmitted beam.Furthermore,the image remote transport scheme demonstrates strong robustness against the opaque obstacles during transmission,with experimental results showing high fidelity and a similarity index exceeding 90%.Exploiting the coherence weight of light as an advanced tool for target information manipulation broadens its applications and opens new avenues in high-security optical communication,holography,and image-based computing.展开更多
Since the half-way mark of the century, theUnited. States has gone through periods of tre-mendous national ferment: political and socialupheavals, economic adjustments, technologicalinnovations. These have produced wi...Since the half-way mark of the century, theUnited. States has gone through periods of tre-mendous national ferment: political and socialupheavals, economic adjustments, technologicalinnovations. These have produced widespreadchanges -- changes that have been reflected andoften paralleled in the American language aswell.展开更多
基金Opening Fund of State Key Laboratory of Soil Plant Machinery System Technology(2014-SKL-05)Natural and Social Science Foundation Cultivation Project of Beijing Technology and Business University(2015-19008001110)Graduate Student Scientific Research Capacity Promotion Project of Beijing Technology and Business University(2015)
文摘The backward interval partial least squares(Bi PLS)and the synergy interval partial least squares(Si PLS)were applied to select the characteristic spectral regions representing the germination rate of 84 wheat seeds and build the near infrared(NIR)quantitative analysis model of wheat seed germination rate.Results from comparison showed that the models built by two variable selection methods had better predictive ability than full-spectral partial least squares(PLS)model.The optimal model was obtained by Si PLS with the calibration and prediction correlation coefficient(R)at 0.902 and 0.967 respectively,and ratio of performance to standard deviate(RPD)at 3.75.Based on this,the physical chemistry significance of characteristic spectral regions was analyzed.The characteristic spectral of wheat seed germination rate contained characteristic peaks of water,protein,starch,fiber,which were the internal nutrients of the seed that influence the germination ability,thus explaining the mechanism of measuring wheat seed germination rate using NIR to a certain extent.
文摘A convenient and large-scale preparation of retinoic acid 1 from β-ionone in five steps with 38% overall yield is described. The key steps are the epoxidization of 2 with a new methylated agent and the condensation 4 with tetraethyl methylenediphophonate in one-pot procedure to prepare 6.
基金National Natural Science Foundation of China(12534014,12374311,12474333,92250304,W2441005)National Key Research and Development Program of China(2022YFA1404800)+2 种基金Taishan Scholars Program of Shandong Province(tsqn202312163)Qingchuang Science and Technology Plan of Shandong Province(2022KJ246)Natural Science Foundation of Shandong Province(ZR2023YQ006,ZR2024QA012,ZR2024QA216)。
文摘Once dismissed as a drawback in optical processing,low coherence of light is now gaining renewed attention,as recent studies reveal that harnessing optical coherence can unlock enhanced capabilities in information processing.Despite ongoing efforts,a persistent challenge remains:the coherence of light degrades significantly under beam propagation,causing information loss and limiting the feasibility of secure remote transmission.This work presents a coherence-weight-based scheme for remote image transport where the confidential image is encoded into the coherence weights of a partially coherent beam whose statistical structure is preserved during free-space propagation.At the receiver,the original image is successfully reconstructed from the characteristic function—cross-spectral density function of the transmitted beam.Furthermore,the image remote transport scheme demonstrates strong robustness against the opaque obstacles during transmission,with experimental results showing high fidelity and a similarity index exceeding 90%.Exploiting the coherence weight of light as an advanced tool for target information manipulation broadens its applications and opens new avenues in high-security optical communication,holography,and image-based computing.
文摘Since the half-way mark of the century, theUnited. States has gone through periods of tre-mendous national ferment: political and socialupheavals, economic adjustments, technologicalinnovations. These have produced widespreadchanges -- changes that have been reflected andoften paralleled in the American language aswell.
