An efficient conversion of biomass-derived ethyl lactate to 1,2-propanediol(1,2-PDO) over CuO was investigated.Among the catalysts we tested, CuO, Cu2 O and Co showed excellent catalytic activity for the conversion of...An efficient conversion of biomass-derived ethyl lactate to 1,2-propanediol(1,2-PDO) over CuO was investigated.Among the catalysts we tested, CuO, Cu2 O and Co showed excellent catalytic activity for the conversion of ethyl lactate to 1,2-PDO in water, and CuO was more active and gave the best result. The 1,2-PDO yield of 93.6% was achieved when Zn acted as a reductant. The results indicated that in situ formed hydrogen by the oxidation of Zn in water is more effective than gaseous hydrogen, which failed to produce the 1,2-PDO from ethyl lactate.From a practical point of view, the present method may provide a useful route for the production of 1,2-PDO from ethyl lactate.展开更多
Color transfer between images uses the statistics information of image effectively. We present a novel approach of local color transfer between images based on the simple statistics and locally linear embedding. A ske...Color transfer between images uses the statistics information of image effectively. We present a novel approach of local color transfer between images based on the simple statistics and locally linear embedding. A sketching interface is proposed for quickly and easily specifying the color correspondences between target and source image. The user can specify the corre- spondences of local region using scribes, which more accurately transfers the target color to the source image while smoothly preserving the boundaries, and exhibits more natural output results. Our algorithm is not restricted to one-to-one image color transfer and can make use of more than one target images to transfer the color in different regions in the source image. Moreover, our algorithm does not require to choose the same color style and image size between source and target images. We propose the sub-sampling to reduce the computational load. Comparing with other approaches, our algorithm is much better in color blending in the input data. Our approach preserves the other color details in the source image. Various experimental results show that our approach specifies the correspondences of local color region in source and target images. And it expresses the intention of users and generates more actual and natural results of visual effect.展开更多
To the Editor:To control the coronavirus disease 2019(COVID-19)pandemic and reduce the complications and deaths resulting from the transmission of the disease,a variety of COVID-19 vaccines,such as mRNA vaccines,adeno...To the Editor:To control the coronavirus disease 2019(COVID-19)pandemic and reduce the complications and deaths resulting from the transmission of the disease,a variety of COVID-19 vaccines,such as mRNA vaccines,adenovirus-vector vaccines,inactivated viral vaccines,and others,have been licensed for emergency use.Most of these vaccines were rolled out in different countries following the successful completion of phase 3 clinical trials.Scale-up of vaccine production and vaccination have provided notable protection to large populations,although some vaccines may cause side effects.Furthermore,as the severe acute respiratory syndrome coronavirus 2(SARS-CoV-2)has mutated and spread further over time,some notable novel variants have emerged,but whether these variants are vulnerable to currently available vaccines is yet to be determined.展开更多
基金Supported by the National Natural Science Foundation of China(21277091)the State Key Program of National Natural Science Foundation of China(21436007)+2 种基金Key Basic Research Projects of Science and Technology Commission of Shanghai Municipality(14JC1403100)the Program for Professor of Special Appointment(Eastern Scholar) at Shanghai Institutions of Higher Learning(ZXDF160002)the Project-sponsored by SRF for ROCS,SEM(BG1600002)
文摘An efficient conversion of biomass-derived ethyl lactate to 1,2-propanediol(1,2-PDO) over CuO was investigated.Among the catalysts we tested, CuO, Cu2 O and Co showed excellent catalytic activity for the conversion of ethyl lactate to 1,2-PDO in water, and CuO was more active and gave the best result. The 1,2-PDO yield of 93.6% was achieved when Zn acted as a reductant. The results indicated that in situ formed hydrogen by the oxidation of Zn in water is more effective than gaseous hydrogen, which failed to produce the 1,2-PDO from ethyl lactate.From a practical point of view, the present method may provide a useful route for the production of 1,2-PDO from ethyl lactate.
基金supported by the National Natural Science Foundation of China(61672482,11626253)the One Hundred Talent Project of the Chinese Academy of Sciences
文摘Color transfer between images uses the statistics information of image effectively. We present a novel approach of local color transfer between images based on the simple statistics and locally linear embedding. A sketching interface is proposed for quickly and easily specifying the color correspondences between target and source image. The user can specify the corre- spondences of local region using scribes, which more accurately transfers the target color to the source image while smoothly preserving the boundaries, and exhibits more natural output results. Our algorithm is not restricted to one-to-one image color transfer and can make use of more than one target images to transfer the color in different regions in the source image. Moreover, our algorithm does not require to choose the same color style and image size between source and target images. We propose the sub-sampling to reduce the computational load. Comparing with other approaches, our algorithm is much better in color blending in the input data. Our approach preserves the other color details in the source image. Various experimental results show that our approach specifies the correspondences of local color region in source and target images. And it expresses the intention of users and generates more actual and natural results of visual effect.
基金Logistic Support Department of Central Military Commission Health Care Project(No.21BJZ35)National Natural Science Foundation of Beijing(No.7212104)
文摘To the Editor:To control the coronavirus disease 2019(COVID-19)pandemic and reduce the complications and deaths resulting from the transmission of the disease,a variety of COVID-19 vaccines,such as mRNA vaccines,adenovirus-vector vaccines,inactivated viral vaccines,and others,have been licensed for emergency use.Most of these vaccines were rolled out in different countries following the successful completion of phase 3 clinical trials.Scale-up of vaccine production and vaccination have provided notable protection to large populations,although some vaccines may cause side effects.Furthermore,as the severe acute respiratory syndrome coronavirus 2(SARS-CoV-2)has mutated and spread further over time,some notable novel variants have emerged,but whether these variants are vulnerable to currently available vaccines is yet to be determined.
