IF 5

Defence Technology(防务技术) Pub Date : 2025-05-01 DOI: 10.1016/j.dt.2024.12.014

Shufeng Shi , Xiangzhen Kong , Junyu Fan , Yong Peng , Qin Fang

{"title":"A comprehensive comparison of hydro-elastoplastic-damage and cap-elastoplastic-damage material models for concrete subjected to impact and blast loadings","authors":"Shufeng Shi , Xiangzhen Kong , Junyu Fan , Yong Peng , Qin Fang","doi":"10.1016/j.dt.2024.12.014","DOIUrl":"10.1016/j.dt.2024.12.014","url":null,"abstract":"<div><div>Concrete material model plays an important role in numerical predictions of its dynamic responses subjected to projectile impact and charge explosion. Current concrete material models could be distinguished into two kinds, i.e., the hydro-elastoplastic-damage model with independent equation of state and the cap-elastoplastic-damage model with continuous cap surface. The essential differences between the two kind models are vital for researchers to choose an appropriate kind of concrete material model for their concerned problems, while existing studies have contradictory conclusions. To resolve this issue, the constitutive theories of the two kinds of models are firstly overviewed. Then, the constitutive theories between the two kinds of models are comprehensively compared and the main similarities and differences are clarified, which are demonstrated by single element numerical examples. Finally, numerical predictions for projectile penetration and charge explosion experiments on concrete targets are compared to further demonstrate the conclusion made by constitutive comparison. It is found that both the two kind models could be used to simulate the dynamic responses of concrete under projectile impact and blast loadings, if the parameter needed in material models are well calibrated, although some discrepancies between them may exist.</div></div>","PeriodicalId":58209,"journal":{"name":"Defence Technology(防务技术)","volume":"47 ","pages":"Pages 83-104"},"PeriodicalIF":5.0,"publicationDate":"2025-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143921746","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Comparative study on the structural properties and electrochemical performance of xylan-derived char catalyzed by Na2CO3 at various concentrations 不同浓度Na2CO3催化木聚糖衍生炭的结构性质和电化学性能比较研究

燃料化学学报 Pub Date : 2025-05-01 DOI: 10.1016/S1872-5813(24)60509-8

LI Yamin , GU Yue , WANG Shuang , TAN Jun

{"title":"Comparative study on the structural properties and electrochemical performance of xylan-derived char catalyzed by Na2CO3 at various concentrations","authors":"LI Yamin , GU Yue , WANG Shuang , TAN Jun","doi":"10.1016/S1872-5813(24)60509-8","DOIUrl":"10.1016/S1872-5813(24)60509-8","url":null,"abstract":"<div><div>In this study, the catalysis function of Na<sub>2</sub>CO<sub>3</sub> to the structural properties of xylan char was well investigated with Na<sub>2</sub>CO<sub>3</sub> on, and the electrochemical performance of xylan char as an anode material for sodium-ion batteries was tested. The characterization of X-ray microscopy and scanning electron microscopy demonstrated that the morphological structure of xylan char was altered due to the addition of Na<sub>2</sub>CO<sub>3</sub> catalyst. The increasement of the Na<sub>2</sub>CO<sub>3</sub>/xylan ratio resulted in a slenderization of the triangular prism shape of the char skeleton and a reduction in porosity. X-ray diffraction analysis revealed that Na<sub>2</sub>CO<sub>3</sub> promoted the growth of the (004) crystal plane of graphite during xylan pyrolysis, while inhibiting the formation of the (100/101) crystal planes. Raman spectroscopy analysis indicated that the presence of Na<sub>2</sub>CO<sub>3</sub> had changed the graphitization degree of xylan char. Electrochemical tests further showed that char prepared with a Na<sub>2</sub>CO<sub>3</sub>/xylan mass ratio of 1∶1 exhibited the highest sodium storage capacity. This study provides a pathway for the rational design carbon materials derived from xylan for future applications in energy storage devices.</div></div>","PeriodicalId":15956,"journal":{"name":"燃料化学学报","volume":"53 5","pages":"Pages 638-645"},"PeriodicalIF":0.0,"publicationDate":"2025-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144099461","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Enhancing energy density in planar micro-supercapacitors: The role of few-layer graphite/carbon black/NiCo2O4 composite materials 提高平面微型超级电容器能量密度：低层石墨/炭黑/NiCo2O4复合材料的作用

燃料化学学报 Pub Date : 2025-05-01 DOI: 10.1016/S1872-5813(24)60511-6

ZHANG Wanggang , HUANG Lei , WANG Menghu , WANG Jian , WEI Aili , LIU Yiming

{"title":"Enhancing energy density in planar micro-supercapacitors: The role of few-layer graphite/carbon black/NiCo2O4 composite materials","authors":"ZHANG Wanggang , HUANG Lei , WANG Menghu , WANG Jian , WEI Aili , LIU Yiming","doi":"10.1016/S1872-5813(24)60511-6","DOIUrl":"10.1016/S1872-5813(24)60511-6","url":null,"abstract":"<div><div>The advancement of planar micro-supercapacitors (PMSCs) for micro-electromechanical systems (MEMS) has been significantly hindered by the challenge of achieving high energy and power densities. This study addresses this issue by leveraging screen-printing technology to fabricate high-performance PMSCs using innovative composite ink. The ink, a synergistic blend of few-layer graphene (Gt), carbon black (CB), and NiCo<sub>2</sub>O<sub>4</sub>, was meticulously mixed to form a conductive and robust coating that enhanced the capacitive performance of the PMSCs. The optimized ink formulation and printing process result in a micro-supercapacitor with an exceptional areal capacitance of 18.95 mF/cm<sup>2</sup> and an areal energy density of 2.63 µW·h/cm<sup>2</sup> at a current density of 0.05 mA/cm<sup>2</sup>, along with an areal power density of 0.025 mW/cm<sup>2</sup>. The devices demonstrated impressive durability with a capacitance retention rate of 94.7% after a stringent 20000-cycle test, demonstrating their potential for long-term applications. Moreover, the PMSCs displayed excellent mechanical flexibility, with a capacitance decrease of only 3.43% after 5000 bending cycles, highlighting their suitability for flexible electronic devices. The ease of integrating these PMSCs into series and parallel configurations for customized power further underscores their practicality for integrated power supply solutions in various technologies.</div></div>","PeriodicalId":15956,"journal":{"name":"燃料化学学报","volume":"53 5","pages":"Pages 646-662"},"PeriodicalIF":0.0,"publicationDate":"2025-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144099462","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Roles of Sn-promoter and carbon nanotubes treatment on supported CoB catalysts for hydrogen production sn促进剂和碳纳米管处理对负载型CoB制氢催化剂的作用

燃料化学学报 Pub Date : 2025-05-01 DOI: 10.1016/S1872-5813(24)60520-7

SHI Limin , LI Yanbo , LEI Qiang , REN Rongzhi , WANG Yujing

引用次数: 0

Performance analysis of fluid-core Whipple shields under hypervelocity impact at different projectile speeds 不同弹丸速度下流芯惠普尔护盾超高速冲击性能分析

IF 5

Defence Technology(防务技术) Pub Date : 2025-05-01 DOI: 10.1016/j.dt.2024.12.023

Anand Pai , Marcos Rodriguez-Millan , Selim Gürgen , Adithya Piccholiya , Nishant Mujumdar , Satish Shenoy B

{"title":"Performance analysis of fluid-core Whipple shields under hypervelocity impact at different projectile speeds","authors":"Anand Pai , Marcos Rodriguez-Millan , Selim Gürgen , Adithya Piccholiya , Nishant Mujumdar , Satish Shenoy B","doi":"10.1016/j.dt.2024.12.023","DOIUrl":"10.1016/j.dt.2024.12.023","url":null,"abstract":"<div><div>Whipple shields as sacrificial bumpers, safeguard the satellites against extremely fast, different-sized projectiles traveling through space in the low earth orbit. Typical Whipple shields comprise a front and rear plate, separated by a gap or space. Recent advancements have explored the use of foam, cellular cores, and alternative materials such as ceramics instead of aluminium for the plates. In the current work, the effect of including fluid cores (air/water) sandwiched between the front and rear plates, on the response to hypervelocity impact was explored through a numerical approach. The numerical simulation consisted of hypervelocity impact by a 2 mm diameter, stainless steel projectile, launched at speeds of 3–9 km/s with a normal impact trajectory towards the Whipple shield. The front and rear bumpers, made of AA6061-T6, were each 1 mm thick. A space of 10 mm was taken between the plates (occupied by fluid). The key metrics analyzed were the perforation characteristics, stages of the debris cloud generation and propagation, energy variations (internal, kinetic and plastic work), temperature variations, and the fragmentation summary. From the computational analysis, employing water-core in Whipple shields could prevent the rear bumper perforation till 6 km/s, lower the peak temperatures at the front bumper perforation zones and debris tip, and generate fewer, larger fragments.</div></div>","PeriodicalId":58209,"journal":{"name":"Defence Technology(防务技术)","volume":"47 ","pages":"Pages 32-45"},"PeriodicalIF":5.0,"publicationDate":"2025-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143921743","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Launch dynamics modeling and simulation of box-type multiple launch rocket system considering plane clearance contact 考虑平面间隙接触的箱式多管火箭发射动力学建模与仿真

IF 5

Defence Technology(防务技术) Pub Date : 2025-05-01 DOI: 10.1016/j.dt.2024.12.016

Jinxin Tang , Guoping Wang , Genyang Wu , Yutian Sun , Lilin Gu , Xiaoting Rui

{"title":"Launch dynamics modeling and simulation of box-type multiple launch rocket system considering plane clearance contact","authors":"Jinxin Tang , Guoping Wang , Genyang Wu , Yutian Sun , Lilin Gu , Xiaoting Rui","doi":"10.1016/j.dt.2024.12.016","DOIUrl":"10.1016/j.dt.2024.12.016","url":null,"abstract":"<div><div>As the performance of the box-type multiple launch rocket system (BMLRS) improves, its mechanical structures, particularly the plane clearance design between the slider on the rocket and the guide inside the launch canister, have grown increasingly complex. However, deficiencies still exist in the current launch modeling theory for BMLRS. In this study, a multi-rigid-flexible-body launch dynamics model coupling the launch platform and rocket was established using the multibody system transfer matrix method and the Newton-Euler formulation. Furthermore, considering the bending of the launch canister, a detection algorithm for slider-guide plane clearance contact was proposed. To quantify the contact force and friction effect between the slider and guide, the contact force model and modified Coulomb model were introduced. Both the modal and launch tests were conducted. Additionally, the modal convergence was verified. By comparing the modal experiments and simulation results, the maximum relative error of the eigenfrequency is 3.29%. thereby verifying the accuracy of the developed BMLRS dynamics model. Furthermore, the launch test validated the proposed plane clearance contact model. Moreover, the study investigated the influence of various model parameters on the dynamic characteristics of BMLRS, including launch canister bending stiffness, slider and guide material, slider-guide clearance, slider length and layout. This analysis of influencing factors provides a foundation for future optimization in BMLRS design.</div></div>","PeriodicalId":58209,"journal":{"name":"Defence Technology(防务技术)","volume":"47 ","pages":"Pages 105-123"},"PeriodicalIF":5.0,"publicationDate":"2025-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143921747","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Preparation of Mn-V-O binary oxides and their catalytic performance for aerobic oxidative desulfurization Mn-V-O二元氧化物的制备及其有氧氧化脱硫的催化性能

燃料化学学报 Pub Date : 2025-05-01 DOI: 10.1016/S1872-5813(24)60519-0

YANG Yanchao , HAN Shuai , LI Xiuping , ZHAO Rongxiang

{"title":"Preparation of Mn-V-O binary oxides and their catalytic performance for aerobic oxidative desulfurization","authors":"YANG Yanchao , HAN Shuai , LI Xiuping , ZHAO Rongxiang","doi":"10.1016/S1872-5813(24)60519-0","DOIUrl":"10.1016/S1872-5813(24)60519-0","url":null,"abstract":"<div><div>Aerobic Oxidative Desulfurization (AODS) represents an economical and sustainable approach for the desulfurization of petroleum distillates, requiring high-performance catalysts to convert sulfides into sulphones under mild reaction conditions. The sheet-like Mn-V-O binary oxides were synthesized using a straightforward hydrothermal process. The crystal phase, morphology, and surface properties of the catalyst were examined using various techniques, including Fourier transform infrared spectroscopy (FT-IR), X-ray diffraction (XRD), scanning electron microscopy (SEM), and X-ray photoelectron spectroscopy (XPS). The desulfurization performance over the catalyst of Mn-V-O binary oxides was assessed using oxygen as the oxidant, and the effects of reaction temperature, catalyst dosage, oxygen flow rate, and sulfide type on the desulfurization rate were investigated. The results indicate that when the reaction temperature is maintained at 110 °C, with 20 mL of model oil, 0.04 g of catalyst and an oxygen flow rate of 150 mL/min, the desulfurization rate can achieve 92.5%. The order of removal rate for different sulfides is as follows: dibenzothiophene (DBT) > 4,6-dimethyldibenzothiophene (4,6-DMDBT) > benzothiophene (BT). The catalyst can be reused up to five times while maintaining a desulfurization activity above 90%. Free radical capture experiments have demonstrated that the superoxide radicals are generated in the presence of the catalyst and oxygen, which effectively oxidize the DBT to DBTO<sub>2</sub>.</div></div>","PeriodicalId":15956,"journal":{"name":"燃料化学学报","volume":"53 5","pages":"Pages 733-741"},"PeriodicalIF":0.0,"publicationDate":"2025-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144099463","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Study on performance of Fe2N catalyst modified by hydrophobic PDVB-DMF for Fischer-Tropsch synthesis 疏水PDVB-DMF修饰Fe2N费托合成催化剂性能研究

燃料化学学报 Pub Date : 2025-05-01 DOI: 10.1016/S1872-5813(24)60526-8

YIN Fu , QU Fan , WANG Fei , CHANG Qiang , WEI Yuxue , ZHANG Chenghua , SUN Song

{"title":"Study on performance of Fe2N catalyst modified by hydrophobic PDVB-DMF for Fischer-Tropsch synthesis","authors":"YIN Fu , QU Fan , WANG Fei , CHANG Qiang , WEI Yuxue , ZHANG Chenghua , SUN Song","doi":"10.1016/S1872-5813(24)60526-8","DOIUrl":"10.1016/S1872-5813(24)60526-8","url":null,"abstract":"<div><div>Fe-based catalysts are commonly used in Fischer-Tropsch synthesis. However, high water pressure in the process can easily lead to oxidation and deactivation of the active phase of the catalyst. Therefore, timely removal of the generated water from the catalyst surface is a key measure to prevent oxidation of the active phase and prolong the lifetime of the catalyst. In this work, hydrophobic agent-porous polydivinylbenzene was mixed with Fe<sub>2</sub>N catalyst. The hydrophobicity of porous polydivinylbenzene accelerated the water migration in local microenvironment. This strategy effectively balanced the adsorption and release of water on the catalyst surface, reduced the occupation of water on the active site and promoted the efficient conversion of syngas. The CO conversion of Fe2N without porous hydrophobic agent was only 34.8%. The active phase was oxidized during the reaction. While CO conversion of Fe2N mixed with porous hydrophobic agent was as high as 80.2%, and no oxidation of active phase was observed after reaction. This work shows that hydrophobic polymers have excellent effects in optimizing catalyst microenvironment, improving reaction efficiency and product selectivity, and thus provides a new strategy for syngas conversion.</div></div>","PeriodicalId":15956,"journal":{"name":"燃料化学学报","volume":"53 5","pages":"Pages 663-671"},"PeriodicalIF":0.0,"publicationDate":"2025-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144099465","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Impact-induced energy release of typical HCP metal/PTFE/W reactive materials: Experimental study and predictive modeling via machine learning 典型HCP金属/聚四氟乙烯/钨反应材料的冲击诱导能量释放：实验研究和机器学习预测模型

IF 5

Defence Technology(防务技术) Pub Date : 2025-05-01 DOI: 10.1016/j.dt.2025.01.006

Zhenwei Zhang , Weixi Tian , Tianyi Wang , Zhiyuan Liu , Yansong Yang , Chao Ge , Lei Guo , Yuan He , Chuanting Wang , Yong He

{"title":"Impact-induced energy release of typical HCP metal/PTFE/W reactive materials: Experimental study and predictive modeling via machine learning","authors":"Zhenwei Zhang , Weixi Tian , Tianyi Wang , Zhiyuan Liu , Yansong Yang , Chao Ge , Lei Guo , Yuan He , Chuanting Wang , Yong He","doi":"10.1016/j.dt.2025.01.006","DOIUrl":"10.1016/j.dt.2025.01.006","url":null,"abstract":"<div><div>Zirconium, titanium, and other hexagonally close-packed (HCP) metals and their alloys are representative high specific strength, high reaction enthalpy, and high thermal conductivity structural materials. In this study, two typical HCP metals, zirconium, and titanium, were applied to reactive materials (RMs) to prepare Zr/PTFE/W RMs and Ti/PTFE/W RMs, validating the feasibility of HCP metal/PTFE/W RMs. The impact response process of typical HCP metal/PTFE/W RMs under high-velocity dynamic loads was studied using shock equations of state (EOS) based on porous mixtures and chemical reaction kinetics equations. An improved hemispherical quasi-sealed test chamber was employed to measure the energy release characteristic curves of 10 types of Zr/PTFE/W RMs and Ti/PTFE/W RMs under impact velocities ranging from 500 m/s to 1300 m/s. The datasets of the impact-induced energy release characteristics of HCP metal/PTFE/W RMs were established. Additionally, the energy release efficiency of HCP metal/PTFE/W RMs under impact was predicted using the support vector regression (SVR) kernel function model. The datasets of Zr/PTFE/W RMs and Ti/PTFE/W RMs with W contents of 0%, 25%, 50%, and 75% were used as test sets, respectively. The model predictions showed a high degree of agreement with the experimental data, with mean absolute errors (MAE) of 4.8, 6.5, 4.6, and 4.1, respectively.</div></div>","PeriodicalId":58209,"journal":{"name":"Defence Technology(防务技术)","volume":"47 ","pages":"Pages 124-138"},"PeriodicalIF":5.0,"publicationDate":"2025-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143921665","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Dynamics and experiments of a tendon-actuated flexible robotic arm for capturing a floating target 肌腱驱动柔性机械臂捕获漂浮目标的动力学与实验

IF 5

Defence Technology(防务技术) Pub Date : 2025-05-01 DOI: 10.1016/j.dt.2024.12.013

Xin Xia , Yunpeng Sun , Jialiang Sun

引用次数: 0

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