IIP: An Information Platform for Intelligent Transportation System and its Applications

This dissertation presents an information platform for Intelligent Transportation System (ITS) applications with a focus on trust management issues, and three example ITS applications, namely ridesharing, Volunteer Transportation Information System (VTIS) and parking/unparking activities detection using smart phones

Additional file 1 of A novel method to detect the early warning signal of COVID-19 transmission

Additional file 1: Figure S1. The country network of Spain. Figure S2. The country network of Italy. Figure S3. The country network of Netherlands. Figure S4. The regional network of Parts of Europe. Figure S5. The early signals of COVID-19 in Netherlands and Spain

Helical Polymer Working as a Chirality Amplifier to Generate and Modulate Multicolor Circularly Polarized Luminescence in Small Molecular Fluorophore/Polymer Composite Films

In-depth studies of chirality and circularly polarized luminescence (CPL) have become indispensable in the process of learning human nature. Small molecules with CPL activity are one of the research hotspots. However, the CPL properties of such materials are generally not satisfying. Here, we synthesized a series of chiral small molecular fluorophores that cannot demonstrate CPL emission themselves. By introducing an optically inactive helical polymer, chirality transfer and chirality amplification efficiently occur, thereby generating intense CPL emission. Through combining different chiralized fluorophores, multicolor CPL-active films with emission wavelength centered at 463, 525, and 556 nm were fabricated, with the maximum luminescence dissymmetry factor (glum) being up to −0.028. Then, benefiting from the strong CPL emission and appropriate energy donor–acceptor system, we further established a circularly polarized fluorescence-energy transfer (CPF-ET) strategy in which the CPL-active films work as a donor emitting circularly polarized fluorescence to excite an achiral fluorophore (Nile red) as the acceptor, producing red CPL with glum of up to −0.011 at around 605 nm

Additional file 1 of Multi-functional conductive hydrogels based on heparin–polydopamine complex reduced graphene oxide for epidermal sensing and chronic wound healing

Additional file 1: Table S1. Content of various components in conductive hydrogel. Figure S1. Dispersion stability of different component nanosheets in water. Figure S2. Particle size distribution and potential of GO nanosheets in water. Table S2. Particle size and potential of rGO nanosheets at different ratios

Brightening up Full-Color and White Circularly Polarized Luminescence through Chiral Induction and Circularly Polarized Light Excitation

Preparation of chiral materials from achiral helical polymers has aroused great interest among researchers. In this work, chiral small molecules were utilized to accomplish chiral induction toward racemic helical polyacetylene via intermolecular π–π stacking by which chiral films with strong optical activity were fabricated. Furthermore, introducing fluorescent components generated full-color and white circularly polarized luminescence (CPL). A CPL generation mechanism is proposed accordingly, namely circularly polarized light excitation (CP-Ex). CPL emission and amplification of the luminescence dissymmetry factor were achieved under the synergetic effect of CP-Ex and chirality transfer. The CP-Ex mechanism was further verified by the double-layered film consisting of a chiral layer and a fluorescent layer. More noticeably, for double-layered films, the sense of CPL signals can be switched by changing the direction of excitation light. This work opens up new strategies for exploring tunable multiple- and white-color CPL materials

Circularly Polarized Fluorescence Energy Transfer for Constructing Multicolor Circularly Polarized Luminescence Films with Controllable Handedness

Utilizing achiral fluorophores to fabricate circularly polarized luminescence (CPL) materials is of significant importance in both fundamental research and practical applications; chirality transfer has become an indispensable process in routine efforts reported so far. However, this may restrict or even become a bottleneck in further advancing CPL materials starting from achiral fluorophores. Inspired by biological light-harvesting architectural systems, we attempt to establish a new strategy, i.e., circularly polarized fluorescence energy transfer (CPF-ET) to explore multicolor CPL films in the absence of chirality transfer. CPL has been successfully realized through both radiative energy transfer and nonradiative energy transfer. The material systems consist of chiral fluorescent helical polyacetylene working as a circularly fluorescence polarized energy donor and achiral fluorophores as an energy acceptor. Achiral acceptors absorb circularly polarized fluorescence energy from the donor and hence emit the corresponding CPL; accordingly, chirality transfer is no longer an indispensable condition, and the sense of the CPL emission of the achiral fluorophores is controlled by the chiral fluorescent polymer. Moreover, multicolor CPL films can be simply prepared by employing varying achiral fluorophores. This work provides a facile and versatile platform for achieving CPL by taking advantage of achiral fluorophores

Intense Circularly Polarized Fluorescence and Room-Temperature Phosphorescence in Carbon Dots/Chiral Helical Polymer Composite Films

Chiral carbon dots (C-dots) with a circularly polarized fluorescence (CPF) property have attracted tremendous attention due to their significant applications in chiral optoelectronics and theranostics. However, constructing circularly polarized room-temperature phosphorescent (CPRTP) C-dots remains a great challenge. Herein, a strategy is established to achieve efficient CPF and CPRTP emissions in C-dots/chiral helical polymer bilayer composite film. Taking advantage of the chiral filter effect of chiral helical polymer, intense CPF and CPRTP emissions with large dissymmetric factors up to 1.4 × 10–1 and 1.2 × 10–2 are respectively obtained, even though there is only a simple interface contact between the C-dots layer and the chiral helical polymer layer. More importantly, white-color CPF emission and multiple information display and encryption are further realized based on the prepared chiral luminescent composite films

Additional file 1 of CircRNAs and their regulatory roles in cancers

Additional file 1: Table S1. Detecting methods of circulating RNAs

Divergent Rh Catalysis: Asymmetric Dearomatization Versus C–H Activation Initiated by C–C Activation

The divergent catalytic reactions based on C–C activation of benzocyclobutenones have been discovered, consisting of a highly enantioselective dearomatic “Cut & Sew” transformation and a cascade C–C/C–H activation/annulation process. The asymmetric dearomatization was achieved with 2.5 mol % [Rh(HQ)(cod)]BF4 and 3 mol % (S)-dtbm-Segphos, leading to a variety of highly enantioenriched polyfused rings (21 examples, up to 99% yield and 99% enantiometric excess (ee)). While the tandem C–C/C–H activation yields a series of amide-linked biaryl tricycles (29 examples, up to 89% yield) through a net C1–C2 bond and Caryl–H bond metathesis. A detailed density functional theory (DFT) computation revealed that an amide-directed regioselective C1–C2 activation with Rh complex is realized, in contrast to the known C1–C8 cleavage. The origins of asymmetric dearomatization were further elucidated

Divergent Rh Catalysis: Asymmetric Dearomatization Versus C–H Activation Initiated by C–C Activation

The divergent catalytic reactions based on C–C activation of benzocyclobutenones have been discovered, consisting of a highly enantioselective dearomatic “Cut & Sew” transformation and a cascade C–C/C–H activation/annulation process. The asymmetric dearomatization was achieved with 2.5 mol % [Rh(HQ)(cod)]BF4 and 3 mol % (S)-dtbm-Segphos, leading to a variety of highly enantioenriched polyfused rings (21 examples, up to 99% yield and 99% enantiometric excess (ee)). While the tandem C–C/C–H activation yields a series of amide-linked biaryl tricycles (29 examples, up to 89% yield) through a net C1–C2 bond and Caryl–H bond metathesis. A detailed density functional theory (DFT) computation revealed that an amide-directed regioselective C1–C2 activation with Rh complex is realized, in contrast to the known C1–C8 cleavage. The origins of asymmetric dearomatization were further elucidated