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| 1 | High wave transmittance and low thermal conductivity Y-a-SiAlON porous ceramics for high-temperature radome applications显示文摘With the development of hypersonic vehicle technology,ceramic-based radome materials are highly demanded due to their high operating temperatures,good dielectric properties,and high mechanical properties.Althoughα-SiAlON is an ideal material for radome applications,its intrinsic low transmittance and high thermal conductivity limit its applications.Herein,we prepared Y-α-SiAlON porous ceramics through tert-butanol(TBA)gel-casting using the self-synthesizedα-SiAlON powder.The Y-α-SiAlON porous ceramics exhibited a uniform micron-level connected pore structure with the porosity(P)of 44.2%-58.6%.The real part of permittivity(s')was 3.13-4.18(8.2-12.4 GHz),which decreased significantly with the increasing porosity.The wave transmittance(|T|^(2))of the sample with porosity of 58.6%could exceed 80%in the thickness range of 6-10 mm.The thermal conductivity was maintained at a low level of 1.38-2.25 W·m^(-1)·K^(-1) owing to the introduction of the pore structure.The flexural strength was 44.73-88.33 MPa,which may be increased by rod-likeα-SiAlON grains.The results indicate that the prepared Y-α-SiAlON porous ceramics meet the requirements of high-temperature wave-transmitting materials for radome applications. | Runwu Yang Jie Xu Jia Guo Xuanyu Meng Ping Zhang Fengying Fan Yanan Qu Feng Gao | 2023 | Journal of Advanced Ceramics2023，12，6： | 1 |
| 2 | Over 16% efficiency all-polymer solar cells by sequential deposition显示文摘All-polymer solar cells(all-PSCs) have received extensive attention due to their excellent mechanical robustness and performance stability. However, the power conversion efficiency(PCE) of all-PSCs still lags behind those of organic solar cells(OSCs)based on non-fullerene small molecule acceptors. Herein, we report highly efficient all-PSCs via sequential deposition(SD) with donor and acceptor layers coated sequentially to optimize the film microstructure. Compared with the bulk heterojunction(BHJ)all-PSCs, an optimized morphology with vertical component distribution was achieved for the SD-processed all-PSCs due to the synergistic effect of swelling of polymer films and using additive. Such strategy involves using chlorobenzene as the first layer processing-solvent for polymer donor, chloroform as the second processing-solvent for polymer acceptor with trace 1-chloronaphthalene, efficiently promoting exciton dissociation and charge extraction and reducing trap-assisted recombination.Consequently, over 16% all-PSCs fabricated via SD method was realized for the first time, which is much higher than that(15.2%) of its BHJ counterpart and also among the highest PCEs in all-PSCs. We have further demonstrated the generality of this approach in various all-polymer systems. This work indicates that the SD method can yield excellent all-PSCs and provides a facile approach to fabricating high-performance all-PSCs. | Bangbang Li Xuanyu Zhang Ziang Wu Jie Yang Bin Liu Qiaogan Liao Junwei Wang Kui Feng Rui Chen Han Young Woo Fei Ye Li Niu Xugang Guo Huiliang Sun | 2022 | Science China Chemistry2022，65，6： | 1 |
| 3 | Joint Esti-mation of Clock Skew and Offset in Pairwise BroadcastSynchronization Mechanism显示文摘 | CAO Xuanyu YANG Feng CAN Xiaoying | 2013 | IEEE Transaction Com-munication2013，61，6： | 1 |
| 4 | Doublet Chirality Transfer and Reversible Helical Transition in Poly(3,5-disubstituted phenylacetylene)s with Pyrene as a Probe Unit显示文摘A novel doublet chirality transfer(DCT)model was dem on strated in cis poly(3,5-disubstituted phenylacetylene)s,i.e.,S-l,R-l,and S-l-NMe.The chiral message from the stereocentwr of alkylamide substituent at 3-position induced the polyene backbone to take cis-transoid helical conformation with a predominant screw sense.And in turn the helical backbone acted as a scaffold to orient the pyrene probes,which was linked to phenyl rings through 5-position,to array in an asymmetric manner.A combinatory analyses of 1H NMR,Raman,FTIR,UV-vis absorption,CD,and computer simulation suggested that the main-chain stereostructure,solve nt nature,and intramolecular hydrogen bonds played important and complex roles on DCT.High c/s-structure content and intramolecular hydrogen bonds were beneficial for the realization of DCT.Reversible helix-helix transition was observed in S-l by changing the nature of solvents.In DMF,S-l adopted a relatively contracted helix,where the main chain exhibited strong optical activity,but that of pyrene was weak.In contrast,a relatively stretched helix formed in CHCI3/in which the optical activity of pyrene was much larger,whereas that of the polye ne backbone was the weakest.This helix-helix transition was attributed to the intramolecular hydrogen bon ds,which was confirmed by solution-state FTIR spectra and computer calculations. | Sheng Wang Xuanyu Feng Jie Zhang Xinhua Wan | 2020 | Chinese Journal of Chemistry2020，38，6： | 0 |
| 5 | A Review of Western and Eastern Traditional Views of Well-Being显示文摘This paper reviews traditional understanding of well-being from both Western and Eastern cultural perspectives. First, two distinct Western traditions in defining well-being are compared, namely hedonic and eudaemonic approaches. The hedonic approach defines happiness as the maximization of pleasure, while the eudaemonic approach regards happiness as the fulfillment of a person’s natural needs and overall flourishing. Second, the views of well-being in lens of Confucianism, Buddhism, and Taoism in the East are reviewed. The common and different understandings of well-being between Western and Eastern traditions are discussed as followed. Finally, two well-known operationalized definitions of well-being, that is subjective well-being and psychological well-being, proposed in the roots of Western traditions are elucidated. | HAN Feng CHEN Xuanyu | 2024 | Journal of Sociology Study2024，14，1： | 0 |
| 6 | Enhancing gene editing efficiency for cells by CRISPR/Cas9 system-loaded multilayered nanoparticles assembled via microfluidics显示文摘Most non-viral carriers for in vitro delivery of nucleic acids suffer from low efficiency of introducing m RNA and other nucleic acids,especially large m RNA.Cas9 protein is the nuclease part of the powerful gene-editing tool,CRISPR/Cas9 system,Cas9 m RNA is particularly large,thus presents a big challenge for delivery.We assembled a multilayered biodegradable nanocarrier to load Cas9 m RNA inside to protect Cas9 m RNA from degradation.We used a microfluidic chip to synthesize a small,positively charged,and degradable core to attract negatively charged Cas9 m RNA.The microfluidic assembly allows the core to be small enough to incorporate into a cationic liposome.The multilayered nanocarriers elevated the delivery efficiency of Cas9 m RNA by over 2 folds and increased the expression by over 5 folds compared to commercially used non-viral carriers.In addition,the multilayered nanocarriers do not require reduced serum medium for transfection.When using the standard complete medium for transfection,the multilayered nanocarriers could increase the expression of Cas9 m RNA by over 15 folds compared to commercially used non-viral carriers.The co-delivery of Cas9 m RNA and sg RNA via LRC elevated the gene-editing efficiency by 3 folds compared to that via commercially used non-viral carriers.Based on the higher transfection efficiency of Cas9 m RNA/sg RNA than commercially used non-viral carriers,these multilayered nanocarriers may have a good prospect as efficient commercial delivery carriers for Cas9 m RNA/sg RNA and other nucleic acids. | Xuanyu Li Qiang Feng Ziwei Han Xingyu Jiang | 2021 | Chinese Journal of Chemical Engineering2021，34，10： | 0 |
| 7 | Influence of order-disorder transition on the mechanical andthermophysical properties of ABOhigh-entropy ceramicsInfluence of order-disorder transition on the mechanical and thermophysical properties of A_(2)B_(2)O_(7)high-entropy ceramics 1显示文摘The order–disorder transition(ODT)of A_(2)B_(2)O_(7)compounds obtained enormous attention owing to the potential application for thermal barrier coating(TBC)design.In this work,the influence of ODT on the mechanical and thermophysical properties of dual-phase A_(2)B_(2)O_(7)high-entropy ceramics was investigated by substituting Ce^(4+)and Hf^(4+)with different ionic radii on B-sites(Zr^(4+)).The X-ray diffraction(XRD),Raman,and transmission electron microscopy(TEM)results show that rA3+/rB^(4+)=1.47 is the critical value of ODT phase boundary with different doping B-site ion contents,and the energy dispersive spectroscopy(EDS)results further indicate the uniform distribution of elements.Interestingly,owing to the high intrinsic disorder derived from high-entropy effect,the A_(2)B_(2)O_(7)high-entropy ceramics exhibit unreduced modulus(E0≈230 GPa)and enhanced mechanical properties(HV≈10 GPa,KIC≈2.3 MPa·m^(0.5)).A_(2)B_(2)O_(7)high-entropy ceramics exhibit excellent thermal stability with relatively high thermal expansion coefficients(TECs)(Hf_(0.25),11.20×10-6 K-1,1000℃).Moreover,the matching calculation implied that the ODT further enhances the phonon scattering coefficient,leading to a relatively lower thermal conductivity of(La_(0.25)Eu_(0.25)Gd_(0.25)Yb_(0.25))2(Zr_(0.85)Ce_(0.15))_(2)O_(7)(1.48–1.51 W/(m·K),100–500℃)compared with other components.This present work provides a novel composition design principle for high-entropy ceramics,as well as a material selection rule for high-temperature insulation applications. | Jiatong ZHU Mingyue WEI Jie XU Runwu YANG Xuanyu MENG Ping ZHANG Jinlong YANG Guangzhong LI Feng GAO | 2022 | Journal of Advanced Ceramics2022，11，8： | 0 |
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