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Propagation characteristics and laws of RDX dust detonation

Particuology 2025年第3期98卷 215-230页

作者： Hanzheng Gong Qi Zhang Jingkun Zou State Key Laboratory of Explosion Science and Safety Protection Beijing Institute of TechnologyBeijing100081China

Compared with industrial dust,explosions involving hexogen(RDX)dust result in more severe *** the explosion characteristics of RDX dust cloud in confined spaces is essential for improving industrial safety and military disaster *** this study,a two-dimensional pipeline model was established using numerical simulation methods to investigate the effects of RDX concentration,ignition energy,pipeline length,and length-to-diameter ratio on the characteristics of RDX dust *** results show that the essence of RDX dust explosions is a violent gas-phase chain exothermic reaction,with high-energy decomposition at its *** explosion intensity increases non-linearly as ignition energy *** RDX concentrations of 100,200,300,and 400 g/m^(3),the time required to form a stable detonation decreases as the RDX dust concentration *** the ignition energy is in the range of 57.23 mJ to 10.1 J,changes in ignition energy have no significant impact on the energy released by the RDX explosion if the ignition energy is ***,at high ignition energy,the explosive hazard of RDX increases *** pipeline length increases,the stable detonation pressure and propagation velocity of the detonation wave essentially unchanged,but the rebound pressure on the pipeline wall gradually *** cases of high length-to-diameter ratios,a flame front reversal phenomenon occurs during the combustion process of RDX *** addition,a new dust rapid-filling method was developed using the C language,which enables rapid and uniform dust filling in combustion simulations.

关键词： RDX dust Detonation Deflagration-to-detonation transition RDX dust concentration Ignition energy

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Impregnating photo-stable gold precursor onto uncalcined TS-1 to boost catalytic hydro-oxidation of propane

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science China Chemistry 2025年第4期68卷 1585-1596页

作者： Zhihua Zhang Erchuan Yang Fan Liu Kesheng Xu Yuxia Zhong Jinwei Sun Shudong Shi Xuezhi Duan Xinggui Zhou State Key Laboratory of Chemical Engineering East China University of Science and TechnologyShanghai 200237China

Immobilizing highly dispersed Au nanoparticles onto titanium silicalite-1(TS-1)by a simple impregnation method under light is still a challenging *** this work;a high photostable Au precursor protected by thiol ligands was firstly synthesized;and the as-prepared Au precursor displayed excellent stability under light for over 30 days;while the Au precursor without thiol ligands formed precipitates after just 2 h under ***;the Au precursor protected by thiol ligands was immobilized on the external surface of uncalcined TS-1(i.e.;TS-1-B)by the incipient wetness impregnation method(IWI method)to prepare Au/TS-1-B *** activity of as-prepared Au/TS-1-B catalyst in the hydro-oxidation of propane to acetone was 1.4 times higher than that of the catalyst prepared by the deposition-precipitation urea method(DPU method).The structures of the Au/TS-1-B catalysts prepared by different methods were analyzed by multiple *** to the Au/TS-1-B catalyst prepared by the DPU method;the Au/TS-1-B catalyst synthesized by the IWI method exhibited a narrower size distribution of Au nanoparticles and had more small Au particles(<2 nm);which is the main reason for its superior ***;the effects of gold loadings;reaction temperature and Si/Ti molar ratio on the catalytic performance of the Au/TS-1-B catalyst prepared by the IWI method were also *** addition;the Au/TS-1-B catalyst prepared by the IWI method also exhibited excellent stability for over 140 h.

关键词： hydro-oxidation of propane acetone Au-Ti bifunctional catalysts IWI method thiol ligands stability

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Low-temperature graphitization of lignin via Co-assisted electrolysis in molten salt

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Green Energy & Environment 2024年第9期9卷 1449-1458页

作者： Shijie Li Wei-Li Song Xue Han Qingqing Cui Yan-li Zhu Shuqiang Jiao Institute of Advanced Structure Technology Beijing Institute of TechnologyBeijing100081China State Key Laboratory of Advanced Metallurgy University of Science and Technology BeijingBeijing100083China State Key Laboratory of Explosion Science and Technology Beijing Institute of Technology Beijing100081China

The ever-growing energy demand and environmental issues have stimulated the development of sustainable energy ***,an efficient and environmentally friendly electrochemical transformation technology was proposed to prepare highly graphitized carbon materials from an abundant natural resource-lignin (LG).The preparation process mainly includes pyrolytic carbonization of raw LG material and electrochemical conversion of amorphous carbon ***,with the assistance of Co catalyst,the graphitization degree of the products was significantly improved,in which the mechanism was the removal of heteroatoms in LG and the rearrangement of carbon atoms into graphite ***,tunable microstructures (nanoflakes) under catalytic effects could also be observed by controlling the electrolytic *** with the products CN1 (without catalyst) and CN5 (with 10%catalyst),the specific surface area are 158.957 and 202.246 m^(2)g^(-1),*** used as the electrode material for lithium-ion batteries,CN5 delivered a competitive specific capacity of~350 m Ah g^(-1)(0.5 C) compared with commercial *** strategy proposed in this work provides an effective way to extract value-added graphite materials from lignin and can be extended to the graphitization conversion of any other amorphous carbon precursor materials.

关键词： Lignin Graphitic carbon Electrochemical conversion Lithium-ion batteries

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A heat transfer model for liquid film boiling on micro-structured surfaces

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National science Review 2024年第5期11卷 352-364页

作者： Pengkun Li Qifan Zou Xiuliang Liu Ronggui Yang School of Energy and Power Engineering Huazhong University of Science and Technology State Key Laboratory of Coal Combustion Huazhong University of Science and Technology

High heat transfer coefficient(HTC) and critical heat flux(CHF) are achieved in liquid film boiling by coupling vibrant vapor bubbles with a capillary liquid film, which has thus received increased interest for thermal management of high-power electronics. Although some experimental progress has been made, a high-fidelity heat transfer model for liquid film boiling is lacking. This work develops a thermal-hydrodynamic model by considering both evaporation atop the wick and nucleate boiling inside the wick to simultaneously predict the HTC and CHF. Nucleate boiling is modeled with microlayer evaporation theory, where a unified scaling factor is defined to characterize the change of microlayer area with heat flux. The scaling factor η is found to be independent of wicking structure and can be determined from a few measurements. This makes our model universal to predict the liquid film boiling heat transfer for various micro-structured surfaces including micropillar, micropowder, and micromesh. This work not only sheds light on understanding fundamental mechanisms of phase-change heat transfer, but also provides a tool for designing micro-structured surfaces in thermal management.

关键词： liquid film boiling heat transfer model critical heat flux heat transfer coefficient thermal management

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Robust enhancement of valley polarization and quantum yield in composition grading lateral heterostructure of MoS2-WS2 monolayer

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Progress in Natural science:Materials International 2024年第1期34卷 187-193页

作者： Mengke Kang Cheng Zhang Congpu Mu Kun Zhai Tianyu Xue Bochong Wang Fusheng Wen Yingchun Cheng Jianyong Xiang Jun-Feng Dai Anmin Nie Zhongyuan Liu Center for High Pressure Science State Key Laboratory of Metastable Materials Science and Technology Yanshan University Shenzhen Institute for Quantum Science and Engineering and Department of Physics Southern University of Science and Technology Shenzhen Key Laboratory of Quantum Science and Engineering

Valley degeneracy can be broken owing to the strong spin-orbit coupling in two-dimensional transition metal dichalcogenides（2D-TMDCs）. Valley-dependent interaction of carriers in TMDCs with different circular polarizations of light offers valley degree-of-freedom besides charge and spin to carry information. Thus, bandgap engineering of 2D-TMDCs plays a critical role in developing practical valleytronic devices. Hereby, we demonstrate a great enhancement in quantum yield as well as polarization of monolayer MoS2achieved by gradually alloying W atoms in MoS2. By appropriately setting a time offset between the evaporation of MoO3and WO3precursors during chemical vapor deposition, a compositionally graded heterostructure of MoS2-WS2monolayer can be readily grown at large scale. Raman and transmission electron microscopy measurements demonstrate that the interface possesses a steep gradient in composition, spanning from MoS2to WS2over a length ～2 μ*** to pure monolayer MoS2, the photoluminescence intensity at the compositionally graded interface of Mo1-xWxS2was observed to increase by a factor of 16 owing to the effective separation of photogenerated carriers by the built-in electric field. Particularly, a remarkably high polarization of 70% at 16 K is demonstrated for the compositionally graded interface of Mo1-xWxS2, which is ～1.4 times larger than that in MoS2and is attributed to the combined effect of the alloyed structure and graded bandgap. Such an engineering scheme with a graded bandgap offers new approach for the development of high-efficiency valleytronics devices.

关键词： Transition metal dichalcognide monolayer Compositionally graded in-plane heterostructure Chemical vapor deposition Valley polarization Quantum yield

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Development and prospects of molten steel deoxidation in steelmaking process

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International Journal of Minerals,Metallurgy and Materials 2024年第1期31卷 18-32页

作者： Zhongliang Wang Yanping Bao State Key Laboratory of Advanced Metallurgy University of Science and Technology BeijingBeijing 100083China

In the long traditional process of steelmaking,excess oxygen is blown into the converter,and alloying elements are used for *** inevitably results in excessive deoxidation of products remaining within the steel liquid,affecting the cleanliness of the *** the increasing requirements for steel performance,reducing the oxygen content in the steel liquid and ensuring its high cleanliness is *** more than a hundred years of development,the total oxygen content in steel has been reduced from approximately 100×10^(-6)to approximately 10×10^(-6),and it can be controlled below 5×10^(-6)in some steel grades.A relatively stable and mature deoxidation technology has been formed,but further reducing the oxygen content in steel is no longer significant for improving steel *** research team developed a deoxidation technology for bearing steel by optimizing the entire conventional *** technology combines silicon–manganese predeoxidation,ladle furnace diffusion deoxidation,and vacuum final *** successfully conducted industrial experiments and produced interstitial-free steel with natural decarbonization ***-aluminum deoxidation was found to control the oxygen content in bearing steel to between 4×10^(-6) and 8×10^(-6),altering the type of inclusions,eliminating large particle Ds-type inclusions,improving the flowability of the steel liquid,and deriving a higher fatigue *** natural decarbonization predeoxidation of interstitial-free steel reduced aluminum consumption and production costs and significantly improved the quality of cast billets.

关键词： steel deoxidation deoxidizer metallurgical equipment bearing steel IF steel

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Effect of Al_(2)O_(3)/SiO_(2) mass ratio and CaO content on viscosity and structure of slag for pyrometallurgical processing of spent automotive catalysts

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Journal of Iron and Steel Research International 2024年第3期31卷 608-621页

作者： Zhe Wang Qi-long Wei Cheng-bin Shi Zhan-cheng Guo State Key Laboratory of Advanced Metallurgy University of Science and Technology BeijingBeijing 100083China

The effect of Al_(2)O_(3)/SiO_(2) mass ratio and CaO content on the viscosity and structure of the CaO-Al_(2)O_(3)-SiO_(2)-6MgO-1.5ZrO_(2)-1.5CeO_(2) slag was *** results show that with the increase in Al_(2)O_(3)/SiO_(2) mass ratio,the viscous flow units within the slag gradually change from Si-O-Si to Al-O-Al and ***,the substitution of Al_(2)O_(3) for SiO_(2) leads to the transformation of Si-O bonds towards weaker Al-O bonds,which weaken the bond strength of the aluminosilicate networks,thus leading to a decrease in the viscosity of *** increase in CaO content effectively promotes the depolymerization of the aluminosilicate networks,resulting in a significant decrease in the viscosity of the *** slag with Al_(2)O_(3)/SiO_(2) of 0.7-1.5 and CaO of 30 wt.%shows promise as the reference slag system for the Fe-collection smelting of spent automotive catalysts due to its good comprehensive performance.

关键词： Aluminosilicate slag Al_(2)O_(3)/SiO_(2)mass ratio CaO content Viscosity Slag structure

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Catalytic effect of K and Na with different anions on lignocellulosic biomass pyrolysis

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Frontiers of Chemical science and Engineering 2024年第12期18卷 1-11页

作者： Haiping Yang Zhiqiang Chen Yi Zhang Biao Liu Yang Yang Ziyue Tang Yingquan Chen Hanping Chen State Key Laboratory of Coal Combustion Huazhong University of Science and TechnologyWuhan 430074China

Alkali metals(AMs)play an important role in biomass pyrolysis,and it is important to explore their catalytic effects so to better utilize biomass *** study analyzed the catalytic influence of K and Na with different anions(Cl–,SO42–,and CO32–)on biomass pyrolysis,and explored the influence on the pyrolytic *** chlorides(NaCl and KCl),sulfates(Na2SO4 and K2SO4)and carbonates(Na2CO3 and K2CO3)were mixed with cellulose and bamboo feedstocks at a mass ratio of 20 wt%,in order to maximize their potential on in situ upgrading of the pyrolysis *** chlorides had little effect on the pyrolysis products,whereas sulfates slightly promoted the yields of char and gas,and had a positive effect on the composition of the gaseous and liquid *** noticeably increased the yields of the char and gases,and improved the C content of the ***,AM salt catalysis is an effective method for co-production of bio-oil and porous char.

关键词： alkali metal salt cellulose biomass catalytic pyrolysis

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Numerical Simulation and Experimental Study on Penetration Ability of Projectile with Toothed Nose 30th

Numerical Simulation and Experimental Study on Penetration A...

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30th International Conference on Computational and Experimental Engineering and sciences, ICCES 2024

作者： Lyu, Yingqing Wu, Haijun Dong, Heng Cheng, Lele Zhang, Tianlong National Key Laboratory of Explosive Science and Safety Protection Beijing Institute of Technology Beijing100081 China

ISBN: (纸本)9783031829062

In order to improve the ability to invade geological materials with high hardness, such as ultra-high strength concrete and high-strength rock, a new type of projectile with a toothed head is designed. Based on the FEM numerical simulation method, the penetration characteristics are studied, and the accuracy of the simulation model is verified by carrying out corresponding experiments. The difference between the penetration ability of the toothed head and the oval head to geological materials is compared, and the penetration mechanism of the toothed head projectile is analyzed. The results show that when the toothed head projectile is rigid, the impact of the toothed head will lead to a pre-damage area of the target in the forward direction, and at the same time, the damage range of the target is reduced. Therefore, the penetration depth of the toothed head projectile is greater than that of the ordinary pointed oval head. When the projectile obliquely penetrates geological materials, the pre-damage zone generated by the toothed head will reduce the asymmetric resistance of the projectile, thereby improving the anti-deflection ability of the toothed head projectile, and its deflection angle is significantly smaller than that of the pointed oval head projectile. Based on the work carried out in this paper, more efficient technical means and more accurate calculation methods are provided for the destruction of deep super-hard geological materials. © The Author(s), under exclusive license to Springer Nature Switzerland AG 2025.

关键词： Ultra-high performance concrete

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Effect of Sodium Tripolyphosphate and Silica Fume on Hydration of High Alumina Cement

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Journal of Wuhan University of technology(Materials science) 2024年第5期39卷 1246-1252页

作者： WANG Jingran YANG Zongyuan ZHANG Shuai ZHANG Jinhua HAN Bingqiang KE Changming The State Key Laboratory of Refractories and Metallurgy Wuhan University of Science and TechnologyWuhan 430081China

It was found that silica fume can reduce the maximum hydration heat release rate of cement by microcalorimetry,inhibit CAH_(10),promote the generation of C_(3)AH_(6)and strätlingite C_(2)ASH_(8),or promote the conversion of CAH_(10)to C_(3)AH_(6).Sodium tripolyphosphate can retard the early hydration of cement,have a slight effect on 1 d hydration products of cement and inhibit the generation hydration *** tripolyphosphate and silica fume can promote the early hydration of cement,advance the formation of C_(2)ASH_(8)or the conversion from CAH_(10)to C_(3)AH_(6)at 1 d.

关键词： high aluminum cement silica fume dispersing agent hydration

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