摘要：Ge2 Sb2 Te5 is the most widely utilized chalcogenide phase-change material for non-volatile photonic applications,which undergoes amorphous-cubic and cubic-hexagonal phase transition under external ***,the cubic-hexagonal optical contrast is negligible,only the amorphous-cubic phase transition of Ge_(2)Sb_(2)Te_(5) is *** limits the optical switching states of traditional active displays and absorbers to *** find that increasing structural disorder difference of cubic-hexagonal can increase optical contrast close to the level of ***,an amorphous-cubichexagonal phase transition with high optical contrast is *** this phase transition,we have developed display and absorber with three distinct switching states,improving the switching performance by 50%.Through the combination of first-principle calculations and experiments,we reveal that the key to increasing structural disorder difference of amorphous,cubic and hexagonal phases is to introduce small interstitial impurities(like N)in Ge2 Sb2 Te5,rather than large substitutional impurities(like Ag)previously *** is explained by the formation energy and lattice *** on the impurity atomic radius,interstitial site radius and formation energy,C and B are also potential suitable *** addition,introducing interstitial impurities into phase-change materials with van der Waals gaps in stable phase such as GeSb_(4) Te_(7),GeSb_(2) Te_(4),Ge_(3)Sb_(2) Te_(6),Sb_(2)Te_(3) will produce high optical contrast amorphous-metastable-stable phase *** research not only reveals the important role of interstitial impurities in increasing the optical contrast between metastable-stable phases,but also proposes varieties of candidate matrices and *** provides new phase-change materials and design methods for non-volatile optical devices with multi-switching states.

摘要：The kinetic competition between electron-hole recombination and water oxidation is a key limitation for the development of efficient solar water splitting materials. In this study, we present a solution for solving this challenge by constructing a quantum dot-intercalated nanostructure. For the first time, we show the interlayer charge of the intercalated nanostructure can significantly inhibit the electron-hole recombination in photocatalysis. For Bi2WO6 quantum dots （QDs） intercalated in a montmorillonite （MMT） nanostructure as an example, the average lifetime of the photogenerated charge carriers was increased from 3.06 μs to 18.8 Ds by constructing the intercalated nanostructure. The increased lifetime markedly improved the photocatalytic performance of Bi2WO6 both in solar water oxidation and environmental purification. This work not oMy provides a method to produce QD-intercalated ultrathin nanostructures but also a general route to design efficient semiconductor-based photoconversion materials for solar fuel generation and environmental purification.

摘要：鉴于近年来国家层面密集出台的政策和教育现代化的迫切需求，重塑教育生态，创新教学模式，构建师生深度互动的学习共同体成为环境艺术设计专业教学改革的重点。概述了环境艺术设计专业发展历程和教学改革目标，探讨了5G背景下环境艺术设计专业研究性教学模式的构建思路和方法，并提出了一系列教学创新策略，以期为推动环境艺术设计专业的可持续发展贡献力量。

摘要：Metal chalcogenide compounds can be used as high-performance cathodes for aqueous Zn ***,the low accessible surfaces and violent volumetric expansion limit their properties and *** address these,phase-engineering strategies coupled with a hollow structure were applied to regulate the adsorption/desorption of OH−on the electrode surface and enhance the electrochemical *** this study,using a Se@C nanorod template,a series of carbon nanotube(CNT)-supported nickel selenides,including cubic NiSe_(2),NiSe_(2)/Ni_(0.85)Se composites,and hexagonal Ni_(0.85)Se,were synthesized through an in situ selenylation process for the first *** to the large specific surface,high porosity,and hollow carbon skeleton,the optimized NiSe_(2)/Ni_(0.85)Se/CNT has a high specific capacity of 616 Cg^(−1),excellent rate capability,and stable cycling *** addition,its inside Faradic mechanism was investigated using a series of ex situ characterizations and density functional theory ***,the fabricated Ni//Zn battery presents a high energy density of 311.4 W h kg^(−1) at 3485 W kg^(−1) and long cycling *** study offers an ingenious strategy for designing nickel selenide electrodes and deeper perception for its Faradic mechanism in alkaline Zn battery.

摘要：Photocatalytic hydrogen peroxide(H_(2)O_(2))production is a promising strategy to replace the traditional production processes;however,the inefficient H_(2)O_(2) productivity limits its *** this study,oxygen-rich g-C_(3)N_(4) with abundant nitrogen vacancies(OCN)was synthesized for photocatalytic H_(2)O_(2) production.X-ray photoelectron spectroscopy and Fourier-transform infrared spectroscopy indicated that oxygen-containing functional groups(–COOH and C–O–C)were *** paramagnetic resonance confirmed the successful introduction of nitrogen *** exhibited efficient photocatalytic H_(2)O_(2) production performance of 1965μmol L^(−1) h^(−1) in air under visible-light *** high H_(2)O_(2) production was attributed to the enhanced adsorption of oxygen,enlarged specific surface area,and promoted carrier *** increased H_(2)O_(2) production rate(5781μmol L^(−1) h^(−1))was achieved in a Na_(3)PO_(4) *** improved performance was attributed to the changed reactive oxygen ***,the adsorbed PO_(4)^(3−) on the surface of the OCN promoted the transfer of holes to the catalyst surface.•O_(2)−obtained by O_(2) reduction reacted with adjacent holes to generate 1O_(2),which could efficiently generate H_(2)O_(2) with ***,PO_(4)^(3−),as a stabilizer,inhibited the decomposition of H_(2)O_(2).

摘要：A validated numerical model was established to simulate gas−liquid flow behaviors in the oxygen-enriched side-blown bath *** model included the slip velocity between phases and the gas thermal expansion *** modeling results were verified with theoretical correlations and experiments,and the nozzle-eroded states in practice were also involved in the *** comparison,it is confirmed that the thermal expansion effect influences the flow pattern significantly,which may lead to the backward motion of airflow and create a potential risk to production ***,the influences of air injection velocity and furnace width on airflow behavior were investigated to provide operating and design *** is found that the thin layer melt,which avoids high-rate oxygen airflow eroding nozzles,shrinks as the injection velocity increases,but safety can be guaranteed when the velocity ranges from 175 to 275 m/***,the isoline patterns and heights of thin layers change slightly when the furnace width increases from 2.2 to 2.8 m,indicating that the furnace width shows a limited influence on production safety.

摘要：Fast crystallization of nanosized zeolite crystals is a very popular process used for practical zeolite catalyst applications. Herein, we report a designer crystallization process for nanosized zeolite omega crystals based on the relationship between the crystallization time and temperature in the Arrhenius equation. Compared to the conventional hydrothermal synthesis of zeolite omega(72 h at room temperature and 240 h at 100℃, MAZ-100), the crystallization of zeolite omega presented in this work only requires a very short time interval(5 h at 180℃, MAZ-180). Physicochemical characterizations, including XRD, SEM, N2 sorption isotherms, and 27 Al MAS NMR show that the product of zeolite omega(MAZ-180) has good crystallinity and uniform nanocrystals. More importantly, after the loading of Pt nanoparticles(0.5 wt%), the Pt/H-MAZ-180 catalyst exhibits higher isomer selectivity and lower cracking selectivity than those of the Pt/H-MAZ-100 catalyst in the hydroisomerization of n-dodecane. These results suggest the potential applications of these omega nanocrystals as supporting catalyst compounds in industrial processes.

摘要：Cell-derived microvesicles(MVs) are secreted from almost all kinds of mammalian cells into the extracellular space, and play crucial roles in intercellular communication and transporting biomolecules between cells. However, there is a great challenge for visualizing and monitoring of MVs’ bio-behaviors due to the limitations of existing labeling methods. Herein, we report the first paradigm of designer cell-self-implemented labeling of MVs secreted from living mammalian MCF-7 cells in situ using the intracellular-synthesized fluorescent quantum dots(QDs) during the formation of MVs. By elaborately coupling intracellular biochemical reactions and metabolism pathways, the MCF-7 cells can be illuminated brightly by intracellular-biosynthesized fluorescent CdSe QDs. Simultaneously, intracellular-synthesized QDs can be in situ encapsulated by the secreted MVs budding from the plasma membrane of the fluorescing cells to label the MVs with an efficiency of up to 89.9%. The whole labeling process skillfully combines designer precise cell-tuned intricate synthesis of CdSe QDs with mild in-situ labeling via cell-selfimplementation just after feeding the cell with suitable chemicals, which is structure-or function-nondestructive and much more straightforward and milder than those by chemical conjugation or indirect encapsulation with conventional fluorogenic labels.

摘要：Taking an oxygen enriched side-blown furnace as the prototype,a hydraulic model was established according to the similarity *** influence of three factors on the gas-liquid two-phase flow was analyzed,*** airflow speed,the submerged depth and the downward angle of the nozzle.A numerical simulation of the hydraulic model was carried out trying to find the suitable turbulence model which can describe the side-blown two-phase flow correctly by comparing the simulation results with the experimental *** experiment shows that the airflow speed has a great influence on the flow of the *** submerged depth of the nozzle has a relatively smaller influence on the penetration depth and the surface fluctuation height in the liquid *** the nozzle is at a downward angle of 15°,the penetration depth and the surface fluctuation height are *** is concluded that the numerical results with the realizable k-εturbulence model are the closest to the experiment for the penetration depth,the surface fluctuation height and the bubble scale.

摘要：The influence of oxygen supply mode on the KIVCET (a Russian acronym for flash?cyclone?oxygen?electric?smelting) process was investigated using numerical simulation. The mass rate ratio (MRR) of central oxygen to lateral oxygen of the central jet distributor (CJD) burner was defined to express the oxygen supply mode, and the KIVCET process with an MRR ranging from 0.09 to 0.39 was simulated. The results show that there are four efficient reaction regions that correspond to four CJD burners. A higher central oxygen flow improves the mixing between particles and oxygen, thus enhancing reactions and shortening the reaction regions. However, a higher dust rate is induced due to the spread of the particle columns. The optimal MRR for a KIVCET furnace with a smelting capacity of 50000 kg/h is suggested to be 0.31. In this case, the chemical reactions associated with the feed are completed with an acceptable dust rate.