This review comprehensively covers recent developments of cyclodextrin-mediated chemical transformations for green chemistry.These cyclic oligomers of glucose are nontoxic,eco-friendly,and recyclable to accomplish emi...This review comprehensively covers recent developments of cyclodextrin-mediated chemical transformations for green chemistry.These cyclic oligomers of glucose are nontoxic,eco-friendly,and recyclable to accomplish eminent functions in water.Their most important feature is to form inclusion complexes with reactants,intermediates,and/or catalysts.As a result,their cavities serve as sterically restricted and apolar reaction fields to promote the efficiency and selectivity of reactions.Furthermore,unstable reagents and intermediates are protected from undesired side reactions.The scope of their applications has been further widened through covalent or noncovalent modifications.Combinations of them with metal catalysis are especially successful.In terms of these effects,various chemical reactions are achieved with high selectivity and yield so that valuable chemicals are synthesized from multiple components in one-pot reactions.Furthermore,cyclodextrin units are orderly assembled in oligomers and polymers to show their cooperation for advanced properties.Recently,cyclodextrin-based metal-organic frameworks and polyoxometalate-cyclodextrin frameworks have been fabricated and employed for unique applications.Cyclodextrins fulfill many requirements for green chemistry and should make enormous contributions to this growing field.展开更多
Perovskite solar cells(PSCs)are undergoing rapid development and the power conversion efficiency reaches 25.7%which attracts increasing attention on their commercialization recently.In this review,we summarized the re...Perovskite solar cells(PSCs)are undergoing rapid development and the power conversion efficiency reaches 25.7%which attracts increasing attention on their commercialization recently.In this review,we summarized the recent progress of PSCs based on device structures,perovskite-based tandem cells,large-area modules,stability,applications and industrialization.Last,the challenges and perspectives are discussed,aiming at providing a thrust for the commercialization of PSCs in the near future.展开更多
We recently proposed a new class of wavelength-swept lasers for swept-source optical coherence tomography （SS-OCT）. It uses the same gain medium with the conventional swept lasers, but does not require any tunable f...We recently proposed a new class of wavelength-swept lasers for swept-source optical coherence tomography （SS-OCT）. It uses the same gain medium with the conventional swept lasers, but does not require any tunable filters. It is based on a principle called ＂dispersion tuning＂, in which a highly dispersive medium is inserted in the laser cavity, and loss/gain modulation is applied to mode-lock the laser. Since the cavity contains no mechanical components, such as tunable filters, we could achieve the very high sweep rate. In this review paper, we describe the principle of the dispersion-tuned swept lasers in detail and present our recent work on the application to the SS-OCT system.展开更多
We demonstrate an adjustable pure dispersion slope compensating-module based on strain-chirped fiber Bragg gratings. The center wavelength of the module is preserved while the pure dispersion slope is tuned.
The development of high-throughput sequencing technologies has provided the opportunity to platform genome-wide surveys.Recent applications of next generation sequencing(NGS)have revealed that the hepatitis B virus(HB...The development of high-throughput sequencing technologies has provided the opportunity to platform genome-wide surveys.Recent applications of next generation sequencing(NGS)have revealed that the hepatitis B virus(HBV)genome is randomly integrated throughout the human genome in patients with HBV infection.Besides the induction of chronic infection of the liver,HBV integration of the host genome contributes to hepatocarcinogenesis,especially in young patients without cirrhosis(1,2).展开更多
文摘This review comprehensively covers recent developments of cyclodextrin-mediated chemical transformations for green chemistry.These cyclic oligomers of glucose are nontoxic,eco-friendly,and recyclable to accomplish eminent functions in water.Their most important feature is to form inclusion complexes with reactants,intermediates,and/or catalysts.As a result,their cavities serve as sterically restricted and apolar reaction fields to promote the efficiency and selectivity of reactions.Furthermore,unstable reagents and intermediates are protected from undesired side reactions.The scope of their applications has been further widened through covalent or noncovalent modifications.Combinations of them with metal catalysis are especially successful.In terms of these effects,various chemical reactions are achieved with high selectivity and yield so that valuable chemicals are synthesized from multiple components in one-pot reactions.Furthermore,cyclodextrin units are orderly assembled in oligomers and polymers to show their cooperation for advanced properties.Recently,cyclodextrin-based metal-organic frameworks and polyoxometalate-cyclodextrin frameworks have been fabricated and employed for unique applications.Cyclodextrins fulfill many requirements for green chemistry and should make enormous contributions to this growing field.
文摘Perovskite solar cells(PSCs)are undergoing rapid development and the power conversion efficiency reaches 25.7%which attracts increasing attention on their commercialization recently.In this review,we summarized the recent progress of PSCs based on device structures,perovskite-based tandem cells,large-area modules,stability,applications and industrialization.Last,the challenges and perspectives are discussed,aiming at providing a thrust for the commercialization of PSCs in the near future.
文摘We recently proposed a new class of wavelength-swept lasers for swept-source optical coherence tomography （SS-OCT）. It uses the same gain medium with the conventional swept lasers, but does not require any tunable filters. It is based on a principle called ＂dispersion tuning＂, in which a highly dispersive medium is inserted in the laser cavity, and loss/gain modulation is applied to mode-lock the laser. Since the cavity contains no mechanical components, such as tunable filters, we could achieve the very high sweep rate. In this review paper, we describe the principle of the dispersion-tuned swept lasers in detail and present our recent work on the application to the SS-OCT system.
文摘We demonstrate an adjustable pure dispersion slope compensating-module based on strain-chirped fiber Bragg gratings. The center wavelength of the module is preserved while the pure dispersion slope is tuned.
基金This work was mainly supported by a Grant-in-Aid for Scientific Research(C)21K08807(Y.M.)from the Ministry of Education,Culture,Sports,Science and Technology(MEXT),Japan.The funding body has no role in the design of the study and analysis and interpretation of data and in writing the manuscript.
文摘The development of high-throughput sequencing technologies has provided the opportunity to platform genome-wide surveys.Recent applications of next generation sequencing(NGS)have revealed that the hepatitis B virus(HBV)genome is randomly integrated throughout the human genome in patients with HBV infection.Besides the induction of chronic infection of the liver,HBV integration of the host genome contributes to hepatocarcinogenesis,especially in young patients without cirrhosis(1,2).
