Engineering 2D Multifunctional Ultrathin Bismuthene for Multiple Photonic Nanomedicine

2D monoelemental nanomaterials (Xenes) have shown tremendous potential for versatile biomedical applications. Bismuth, as a heavy element in pnictogens, has acquired massive research interest due to its unique optical performance, high biocompatibility, stability, and relatively low cost. However, the utilization of 2D bismuthene in nanomedicine has not been achieved because of the difficulty in engineering bismuthene with crucial structural/compositional characteristics for satisfying strict biomedical requirements. Herein, to address this Gordian knot, a facile strategy to intercalate and delaminate Bi bulk for generating mass few-layered 2D bismuthene with high yield by employing a water molecule mediated freezing–thawing process and sodium borohydride-triggered reduction treatment is proposed. The resulting 2D bismuthene displays good optical performance in the near-infrared (NIR) biowindow and can be excited via red light for reactive oxygen species generation, enabling applications in multiple photonic cancer nanomedicine settings, including photothermal hyperthermia and photodynamic therapy. Utilizing the intrinsic desirable optical absorbance and strong X-ray attenuation of bismuthene, dual photonic therapy can be conducted under the supervision of photoacoustic/computed tomography guided multimodal imaging. This research not only offers a potential mass-production ready, cost-effective, and eco-efficient methodology for engineering 2D Xenes, but also exploits an innovative 2D bismuthene based photonic cancer nanomedicine.     

关于太阳能热利用高质量发展策略的思考

截止到2019年,我国太阳能热利用行业仍保持了正增长,全年新增集热面积总量约为3250万平方米,其中工程市场占比达到了 75％以上,零售市场进一步下降,形成了以建筑热水系统为主导,工农业热水(热能)及民用采暖为辅的市场格局.从2012年至今的过去8年来,太阳能光热在建筑节能领域热水系统应用方面得到的快速发展,受益于各地方政府强制安装政策的庇护,但现阶段来看,大量实施的项目中也存在着诸多的问题,如何实现行业未来的高质量发展,本文就太阳能热利用行业发展中的问题该如何解决提出了思考方向.     

Enhanced Magnetoresistance Effect and Magnetic Properties of Double Perovskite La2−xSrxMnRuO6 (0 ≤ x ≤ 1.0)

Journal of Superconductivity and Novel Magnetism - Double perovskite La2?xSrxMnRuO6 (x?=?0, 0.3, 0.5, 0.8, 1.0) samples were synthesized by the standard solid-state reaction...     

"智慧消防"在防火监督中的应用探究

随着科学技术的发展和经济水平的提高,人们对消防安全的认识日益增强.需要重视消防安全,做好消防管理,并采用先进的管理模式,在当前的消防管理模式下应用"智能消防",可以确保人民生命财产安全提供强有力的支持,使现代科学技术可以更好地融入到消防工作中,不仅可以提高火灾监控能力,还可以提高消防水平,对消防安全领域的发展具有重要意义,使传统消防逐步向智能消防转变,并不断升级.     

Gradient-based recursive parameter estimation for a periodically nonuniformly sampled-data Hammerstein–Wiener system based on the key-term separation

The identification of the Hammerstein–Wiener (H-W) systems based on the nonuniform input–output dataset remains a challenging problem. This article studies the identification problem of a periodically nonuniformly sampled-data H-W system. In addition, the product terms of the parameters in the H-W system are inevitable. In order to solve the problem, the key-term separation is applied and two algorithms are proposed. One is the key-term-based forgetting factor stochastic gradient (KT-FFSG) algorithm based on the gradient search. The other is the key-term-based hierarchical forgetting factor stochastic gradient (KT-HFFSG) algorithm. Compared with the KT-FFSG algorithm, the KT-HFFSG algorithm gives more accurate estimates. The simulation results indicate that the proposed algorithms are effective.     

Special issue on progress in advanced energy technologies and materials

正This special issue of the Chinese Journal of Chemical Engineering(CJCh E) concerns with the current progress in advanced energy technologies and materials related to chemical science and technology, especially the work in the field of renewable energy,energy storage, clean and efficient utilization of energy, aligning well to the scope of this Journal.The world is moving towards a sustainable, clean and low-carbon future via ‘Energy Transition', i.e.,     

Porous nitrogen-enriched hollow carbon nanofibers as freestanding electrode for enhanced lithium storage

One-dimensional porous carbons bearing high surface areas and sufficient heteroatom doped functional-ities are essential for advanced electrochemical energy storage devices, especially for developing free-standing film electrodes. Here we develop a porous, nitrogen-enriched, freestanding hollow carbon nanofiber (PN-FHCF) electrode material via filtration of polypyrrole (PPy) hollow nanofibers formed by in situ self-degraded template-assisted strategy, followed by NH3-assisted carbonization. The PN-FHCF retains the freestanding film morphology that is composed of three-dimensional networks from the entanglement of 1D nanofiber and delivers 3.7-fold increase in specific surface area (592 m2·g-1) com-pared to the carbon without NH3 treatment (FHCF). In spite of the enhanced specific surface area, PN-FHCF still exhibits comparable high content of surface N functionalities (8.8％, atom fraction) to FHCF. Such developed hierarchical porous structure without sacrificing N doping functionalities together enables the achievement of high capacity, high-rate property and good cycling stability when applied as self-supporting anode in lithium-ion batteries, superior to those of FHCF without NH3 treatment.     

Experimental and computational study on the separation performance of an electrostatic precipitator with curved transvers collecting plates

Aiming at the problems of low collection efficiency of fine particulate matter and large area occupied by existing electrostatic precipitators (ESP), a new type of horizontal electrode ESP is proposed. It has the advantages of accelerating turbulent coalescence, increasing the effective dust collecting area and increasing the particle driving speed. The performance of the new type of ESP is systematic studied through simulation and experiment at the same time, and the results matches well. By comparing the dust removal effect of the horizontal electrode ESP and the conventional ESP, it can be concluded that the horizontal electrode ESP has a better dust removal efficiency, and can still maintain a better dust removal effect under high air velocity. The dust removal efficiency of new ESP can reach above 98% under the experimental conditions.