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A novel nano-thermite system with BiOF as fluorine-containing oxidant for enhanced energy release performance

CHEMICAL ENGINEERING JOURNAL 2023年第1期468卷

作者： Li, Jingwei liu, xuwen Huang, Qian liu, Feifan Xie, Quanmin Hu, Maocong Su, Jiaxin Zhang, Chengchen Zeng, Yuyang Zhu, Chenguang Nanjing Univ Sci & Technol Sch Chem & Chem Engn Nanjing 210094 Peoples R China Jianghan Univ State Key Lab Precis Blasting Wuhan 430113 Peoples R China Shaanxi Appl Phys Chem Res Inst Sci & Technol Appl Phys Chem Lab Xian 710061 Peoples R China

The reduced diffusion distance of nano-thermite results in an exceptionally high energy release rate and intense exothermic reactions upon ignition, which has drawn significant interest from researchers in the field of energetic materials. With the deepening of research, metal fluorides are gradually favored by researchers because of their unique reaction characteristics. This paper presents the synthesis of a new fluorine-containing oxidant, BiOF, and its use in the preparation of a novel nano-thermite with n-Al. BiOF crystals exhibit a unique microscopic morphology and are interlaced into "nanoflower" microspheres, which allows for good interfacial contact between the oxidant and fuel during the recombination process. The resulting n-Al/BiOF system displays excellent ignition and combustion performance, with a combustion temperature higher than the boiling point of its main combustion products, AlF3 and Bi. Compared with n-Al/CuO and n-Al/MoO3 systems, n-Al/BiOF exhibits a higher flame propagation rate under confinement. In addition, the ignition threshold of the n-Al/BiOF system is also smaller than that of the n-Al/CuO and n-Al/MoO3 systems. Furthermore, the paper examines the reaction mechanism of the n-Al/BiOF system through thermal reaction path analysis and combustion and thermal analysis product characterization. The paper discovers a "pre-ignition" reaction mechanism before the ignition temperature, where the strongly electronegative fluorine in BiOF corrodes the Al2O3 shell, promoting the release of aluminum energy. The synergistic and effective interaction between oxygen, fluorine, and fuel aluminum in the n-Al/BiOF system results in efficient energy release performance, making BiOF a promising candidate for n-Al based reactive materials in propellants, explosives, and pyrotechnic products.

关键词： Nano-thermites Nanostructured energetic materials Conformational relationships Fluorinated oxidizing agent Pre-ignition reaction

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An energetic composite formed of wrinkled rGO sheets wrapped around copper azide nanowires with higher electrostatic safety as a green primary explosive

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RSC ADVANCES 2020年第51期10卷 30700-30706页

作者： liu, xuwen Hu, Yan Li, Tingting Ye, Yinghua Shen, Ruiqi Nanjing Univ Sci & Technol Sch Chem Engn Nanjing Peoples R China Minist Ind & Informat Technol Micronano Energet Devices Key Lab Beijing Peoples R China

A green primary explosive with high energy density and electrostatic safety was synthesized in this work. A precursor consisting of wrinkled reduced graphene oxide sheets wrapped around copper nanowires (CuNWs@rGO) was fabricated through a facile one-pot hydrothermal approach. The as-prepared precursor was deposited on a silicon wafer by electrophoretic deposition technology, which significantly reduced the safety risks of directly handling the powder sample in the azide reaction. Wrinkled rGO sheets wrapped around copper azide nanowires (CANWs@rGO) were preparedin situby reaction of the precursor with HN(3)gas. The initiation capability was tested by using it to detonate hexogen (RDX) against a lead plate with a thickness of 5 mm, and its detonation performance was found to be better than that of commercial diazodinitrophenol (DDNP). The electrostatic sensitivity of the CANWs@rGO composite was investigated, and the result shows that the discharge energy at 50% (E-50%) of CANWs@rGO was 0.96 mJ, which indicates that it has a much higher electrostatic safety than that of pure copper azide (0.05 mJ).

关键词： Nanowires

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Facile fabrication of cross-linked n-Al/PVDF films with the tunability of reactivity and laser sensitivity

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JOURNAL OF ALLOYS AND COMPOUNDS 2023年 936卷

作者： Li, Jingwei liu, xuwen Zhang, Zihao Wang, Yikai Zhang, Mingxing Guo, Kaige Duanmu, Fanshun Zhu, Chenguang Nanjing Univ Sci & Technol Sch Chem & Chem Engn Nanjing 210094 Peoples R China Sci & Technol Electro Opt Informat Secur Control L Tianjin 300308 Peoples R China Jianghan Univ State Key Lab Precis Blasting Wuhan 430113 Peoples R China

Metastable intermolecular complexes (MICs), which have exceptional energy density and reactivity, have drawn considerable attention in the field of energetic materials. In this work, a facile cryogel method is explored for fabricating n-Al/PVDF energetic films with the controllable tuning of reactivity and laser sensitivity. The microstructure of the films was transformed from dense packing to 3D cross-linking by adjusting the process parameters. With the formation of the porous structure, the energetic film exhibits a higher energy release rate (the flame propagation speed increases from 8.2 cm center dot s-1 to 13.5 cm center dot s-1) and a lower laser ignition delay (from 33.6 ms to 10.1 ms). The mechanisms underlying the altered reactivity are discussed in depth to provide insights into understanding changes in energy properties. This work provides an effective and facile strategy for realizing the tunability of the reactivity and sensitivity of n-Al/PVDF composites, which will aid to broaden their use in micro-transducers.(c) 2022 Elsevier B.V. All rights reserved.

关键词： Nanostructured energetic materials Conformational relationships Reaction tunability Cryogel method Laser sensitivity

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Recovering copper ions from wastewater with chitosan to synthesize lead-free primary explosives

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JOURNAL OF ALLOYS AND COMPOUNDS 2022年 914卷

作者： liu, xuwen Hu, Yan Yang, Caimin Su, Jiaxin Ye, Yinghua Shen, Ruiqi Nanjing Univ Sci & Technol Sch Chem & Chem Engn Nanjing 210094 Peoples R China Minist Ind & Informat Technol Micronano Energet Devices Key Lab Nanjing 210094 Peoples R China

Chitosan (CTS) is a well-known adsorbent capable of absorbing copper ions. It's also a high-quality biomass carbon source. The carbon skeleton formed by the pyrolysis of CTS has outstanding electrical conductivity, which can help copper azide (CA), a new type of primary explosive that's particularly sensitive to electrostatic stimuli, be more electrostatically safe. The CTS-Cu complex is precipitated by using CTS to adsorb and flocculate copper ions in wastewater. To construct the Cu@carbonized chitosan (CCTS) precursor material, the organic ligands in the CTS-Cu complex are calcined into a porous three-dimensional carbon matrix, and the copper ions are transformed into copper nanoparticles embedded in CCTS. The azide reaction converts copper nanoparticles (CuNPs) into high-energy CA. With its good electrical conductivity, CCTS maintains its framework structure and effectively improves the electrostatic safety of composite energetic materials. CA@CCTS has a CA content of 69.7%, an electrostatic ignition energy (E-50) of about 1.19 mJ, and a heat release of 1803.22 J/g. This work takes advantage of CA and CTS's environmental friendliness. CA@CCTS, as a novel lead-free primary explosive, has good electrostatic safety while containing a high proportion of CA. (C) 2022 Elsevier B.V. All rights reserved.

关键词： Chitosan Adsorbent Carbonization Composite energetic materials Copper azide Electrostatic safety

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Code Conversion Method on Process-in-Memory Platform 3

Code Conversion Method on Process-in-Memory Platform

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3rd International Conference on Applied Mathematics, Modeling and Simulation (AMMS)

作者： liu, Jinhui Zhao, Chen Du, Fangzhou liu, xuwen Xidian Univ Dept Comp Sci & Technol Xian 710126 Shaanxi Peoples R China

Process-in-Memory (PIM) has become a favorable solution for data intensive applications with its advantages of placing processing units in or near memory, reducing the movement of data between memory and processing unit. However, most recent PIM platforms have relatively large limitations in terms of computing flexibility and types of computing, and programming is complicated, which cannot provide a unified programming framework. Therefore, it becomes a challenge to deploy the code to the hardware, which severely restricts the application development on the PIM platform. This paper presents a method of code conversion based on the PIM platform, which allows users to develop applications on the PIM platform with the high-level programming language, makes the PIM platform more accessible in the development of data intensive applications.

关键词： PIM code conversion method NNs Algorithm library

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Theoretical Analysis and Numerical Simulation of the Motion of RDX Deflagration-Driven Flyer Plate Based on Laser-Initiated Micro-Pyrotechnic Devices

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MICROMACHINES 2023年第5期14卷 917-917页

作者： Xian, Mingchun Zhao, Kang liu, xuwen Meng, Yangang Xie, Junyao Li, Jingwei Tong, Lele Huang, Meng Wu, Lizhi Nanjing Univ Sci & Technol Sch Chem & Chem Engn Nanjing 210094 Peoples R China Sichuan Aerosp Chuannan Pyrotech Co Ltd Luzhou 646000 Peoples R China Jianghan Univ State Key Lab Precis Blasting Wuhan 430056 Peoples R China

Miniaturized laser-initiated pyrotechnic devices have great application prospects in aerospace and modern weapon systems due to their excellent energy output performance and reliability. In order to develop a low-energy insensitive laser detonation technology based on a two-stage charge structure, it is important to deeply analyze the motion law of a titanium flyer plate driven by the deflagration of the first-stage charge (RDX). The effects of the charge mass of RDX, flyer plate mass, and barrel length on the motion law of flyer plates were studied through a numerical simulation method based on the Powder Burn deflagration model. The consistency between the numerical simulation and the experimental results was analyzed using the paired t confidence interval estimation method. The results show that the Powder Burn deflagration model can effectively describe the motion process of the RDX deflagration-driven flyer plate with a 90% confidence level, and its velocity error is =6.7%. The speed of the flyer plate is proportional to the mass of the RDX charge, inversely proportional to the mass of the flyer plate, and exponentially related to its moving distance. As the moving distance of the flyer plate increases, the RDX deflagration products and air in front of the flyer plate are compressed, which inhibits the motion of the flyer plate. In the optimum state (the mass of the RDX charge is 60 mg, the mass of the flyer is 85 mg, and the length of the barrel is 3 mm), the speed of the titanium flyer reaches 583 m/s, and the peak pressure of the RDX deflagration reaches 2182 MPa. This work will provide a theoretical basis for the refined design of a new generation of miniaturized high-performance laser-initiated pyrotechnic devices.

关键词： laser-initiated deflagration-driven flyer plate powder burn

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Inflammatory resolution and vascular barrier restoration after retinal ischemia reperfusion injury

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JOURNAL OF NEUROINFLAMMATION 2021年第1期18卷 1-26页

作者： Abcouwer, Steven F. Shanmugam, Sumathi Muthusamy, Arivalagan Lin, Cheng-mao Kong, Dejuan Hager, Heather liu, xuwen Antonetti, David A. Univ Michigan Kellogg Eye Ctr Dept Ophthalmol & Visual Sci Michigan Med Ann Arbor MI 48105 USA Esperovax Inc Plymouth MI 48170 USA Dept Mol & Integrat Physiol Ann Arbor MI 48109 USA

Background: Several retinal pathologies exhibit both inflammation and breakdown of the inner blood-retinal barrier (iBRB) resulting in vascular permeability, suggesting that treatments that trigger resolution of inflammation may also promote iBRB restoration. Methods: Using the mouse retinal ischemia-reperfusion (IR) injury model, we followed the time course of neurodegeneration, inflammation, and iBRB disruption and repair to examine the relationship between resolution of inflammation and iBRB restoration and to determine if minocycline, a tetracycline derivative shown to reverse microglial activation, can hasten these processes. Results: A 90-min ischemic insult followed by reperfusion in the retina induced cell apoptosis and inner retina thinning that progressed for approximately 2 weeks. IR increased vascular permeability within hours, which resolved between 3 and 4 weeks after injury. Increased vascular permeability coincided with alteration and loss of endothelial cell tight junction (TJ) protein content and disorganization of TJ protein complexes. Shunting of blood flow away from leaky vessels and dropout of leaky capillaries were eliminated as possible mechanisms for restoring the iBRB. Repletion of TJ protein contents occurred within 2 days after injury, long before restoration of the iBRB. In contrast, the eventual re-organization of TJ complexes at the cell border coincided with restoration of the barrier. A robust inflammatory response was evident a 1 day after IR and progressed to resolution over the 4-week time course. The inflammatory response included a rapid and transient infiltration of granulocytes and Ly6C(+) classical inflammatory monocytes, a slow accumulation of Ly6C(neg) monocyte/macrophages, and activation, proliferation, and mobilization of resident microglia. Extravasation of the majority of CD45(+) leukocytes occurred from the superficial plexus. The presence of monocyte/macrophages and increased numbers of microglia were sustained until

关键词： Ischemia-reperfusion injury Retinal vasculature Blood-retina barrier Tight junctions Resolution of inflammation Microglia Leukocytes Granulocytes Monocytes Myeloid-derived macrophages Minocycline TNF-alpha IL-1 beta Cox-2 Serpina3n

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Rapid non-destructive analysis of lignin using NIR spectroscopy and chemo-metrics

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FOOD AND ENERGY SECURITY 2021年第3期10卷

作者： Wu, Xin Li, Guanglin liu, xuwen He, Fengyun Southwest Univ Coll Engn & Technol Chongqing 400715 Peoples R China Chongqing Coll Elect Engn Chongqing Peoples R China

Lignin plays an important role in the formation of stone cells in pears. However, the accumulation of lignin had adverse impact on the flavor and quality of the fruit. A rapid and accurate method for measuring the lignin content of pears is therefore required. An improved variables selection method called 'the bootstrapping soft shrinkage combined with frequency and regression coefficient of variables (FRCBOSS)' was therefore developed based on 'the bootstrapping soft shrinkage (BOSS)'technique, to identify the characteristic wavelengths of near-infrared (NIR) spectra for non-destructive and rapid analysis of lignin. Sub-models were generated by weighted bootstrap sampling (WBS) in the FRCBOSS method. For the BOSS method, the new weights of variables were determined only as the absolute values of regression coefficients of variables in each iteration. In contrast, the FRCBOSS method also considers the frequency of variables in variable space. Moreover, the FRCBOSS algorithm overcomes the disadvantage of BOSS in selecting variables, which could incorporate useful wavelengths that would otherwise be removed by the BOSS method. In addition, a range of different pre-treatment methods were used for comparison in the detection of lignin in the Snow pears. These include Savitzky-Golay Smoothing (SG), Normalization (NORM), Standard Normal Variate (SNV), and 1st Derivative (D1), as well as a combination of these methods and the different variables selection method (SiPLS, SiPLS-SPA, SiPLS-CARS, SiPLS-BOSS, and SiPLS-FRCBOSS). The number of variables selected by FRCBOSS was a little larger than that selected by BOSS. The partial least square regression (PLSR) model based on the 19 variables selected by SiPLS-FRCBOSS method had the best prediction ability, with a Rp value of prediction of 0.880 and a RMSEP value of 1.004%. We conclude that NIR diffuse reflectance spectroscopy technology combined with FRC-BOSS is an accurate and useful tool for the non-destructive and rapid det

关键词： FRCBOSS lignin content NIR spectroscopy pear variables selection

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外泌体在铁死亡相关疾病中的作用及靶向治疗策略研究进展

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海军军医大学学报 2023年第10期44卷 1212-1218页

作者：张立杨珊珊王培朱宇刘旭雯肖健海军军医大学(第二军医大学)第二附属医院胸心外科上海200003 广西大学医学院南宁530004 海军军医大学(第二军医大学)第一附属医院特需诊疗科二病区上海200433 上海理工大学健康科学与工程学院上海200093

铁死亡是一种铁依赖性非细胞凋亡的程序性细胞死亡方式。迄今为止,铁死亡已被证明参与了许多疾病的病理生理机制,如神经退行性疾病、缺血/再灌注损伤和肿瘤等。外泌体作为细胞间的信息传递途径,已被证明在铁死亡进程中具有重要调控意义... 详细信息

铁死亡是一种铁依赖性非细胞凋亡的程序性细胞死亡方式。迄今为止,铁死亡已被证明参与了许多疾病的病理生理机制,如神经退行性疾病、缺血/再灌注损伤和肿瘤等。外泌体作为细胞间的信息传递途径,已被证明在铁死亡进程中具有重要调控意义。同时,外泌体作为一种免疫原性低、生物相容性好、效率高的药物传递载体,在疾病治疗中的应用愈发广泛。本文总结了近年外泌体在铁死亡相关疾病发生机制中的调控作用及以铁死亡为靶点的新型外泌体治疗策略的研究进展。

关键词：铁死亡外泌体肿瘤微环境靶向治疗

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Research on virtual power plant's participation in power market under the background of energy internet in China 5

Research on virtual power plant's participation in power mar...

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2020 5th International Conference on Renewable Energy and Environmental Protection, ICREEP 2020

作者： Su, Yang Kening, Chen Yang, Wang Yu, Jiang Yu, Ding xuwen, liu Qiuyang, Ma State Grid Energy Research Institute Beijing102209 China State Grid JiangSu Electric Power Co. Ltd. Jiang-Su210008 China

Under the background of energy internet, a large influx of market entities participates in the interaction of "source network and load storage" and becomes an important resource for system regulation through the electricity marketization. Among them, the virtual power plant involves several market participators such as the distributed generation, demand side adjustable resources, distributed energy storage. The research of the operation mechanism and market-oriented trading organization for the virtual power plant becomes a popular topic in recent years. This paper proposes a novel mechanism for virtual power plants to participate in the electricity trading market, including the trading categories and auxiliary service which can be provided by the virtual power plant. © Content from this work may be used under the terms of the Creative Commons Attribution 3.0 Licence.

关键词： Virtual Power Plants

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