Binbin Yan , Yuxin Wei , Shuangxi Liu , Wei Huang , Ruizhe Feng , Xiaoqian Chen
{"title":"A review of current studies on the unmanned aerial vehicle-based moving target tracking methods","authors":"Binbin Yan , Yuxin Wei , Shuangxi Liu , Wei Huang , Ruizhe Feng , Xiaoqian Chen","doi":"10.1016/j.dt.2025.01.013","DOIUrl":"10.1016/j.dt.2025.01.013","url":null,"abstract":"<div><div>Unmanned aerial vehicles (UAVs) have become crucial tools in moving target tracking due to their agility and ability to operate in complex, dynamic environments. UAVs must meet several requirements to achieve stable tracking, including maintaining continuous target visibility amidst occlusions, ensuring flight safety, and achieving smooth trajectory planning. This paper reviews the latest advancements in UAV-based target tracking, highlighting information prediction, tracking strategies, and swarm cooperation. To address challenges including target visibility and occlusion, real-time prediction and tracking in dynamic environments, flight safety and coordination, resource management and energy efficiency, the paper identifies future research directions aimed at improving the performance, reliability, and scalability of UAV tracking system.</div></div>","PeriodicalId":58209,"journal":{"name":"Defence Technology(防务技术)","volume":"51 ","pages":"Pages 201-219"},"PeriodicalIF":5.9,"publicationDate":"2025-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145098555","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}
{"title":"Mesoscopic analysis on projectile motion characteristics in oblique penetration into concrete","authors":"Xiaoyu Li , Jie Zhang , Yu Rong , Zhihua Wang","doi":"10.1016/j.dt.2025.05.001","DOIUrl":"10.1016/j.dt.2025.05.001","url":null,"abstract":"<div><div>The motion characteristics of projectile during oblique penetration into concrete were studied using a three-dimensional meso-scale model. The finite element model validation and parameter chosen were conducted by comparing the experimental data, with computational efficiency enhanced through improved mesh refinement. Penetration simulations involving deformable projectiles at various incident angles analyzed the effects of aggregate volume fraction and particle size on ballistic trajectory and terminal deflection. Sensitivity analysis reveals a strong power-law relationship between aggregate content and the projectile's deflection angle. The increase in aggregate content will enhance the confinement effect, shorten the intrusion distance of the projectile, and lead to a decrease in the deflection angle of the projectile. The effect of aggregate particle size on the projectile deflection angle follows a Gaussian distribution. The maximum deflection angle occurs when the aggregate particle size is between 2.7 and 3.1 times the projectile diameter. An increase in particle size reduces the number of aggregate-mortar interfaces at the same aggregate volume fraction, leading to an enlargement of the damage zone in concrete, a decrease in the number of cracks, and an increase in crack length. These findings enhance the understanding of concrete penetration mechanisms and offers valuable insights for engineering structure protection.</div></div>","PeriodicalId":58209,"journal":{"name":"Defence Technology(防务技术)","volume":"51 ","pages":"Pages 220-233"},"PeriodicalIF":5.9,"publicationDate":"2025-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145098556","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}
{"title":"Influence of solvent-to-oil mass ratios on high-pressure asphaltene precipitation","authors":"Aly ElMasry , Hamed Rahnema , Milad Rahnema","doi":"10.1016/j.ptlrs.2025.03.005","DOIUrl":"10.1016/j.ptlrs.2025.03.005","url":null,"abstract":"<div><div>Asphaltene precipitation during solvent-based enhanced oil recovery under reservoir conditions impedes production efficiency and degrades oil quality. This study aims to optimize solvent-to-oil mass ratios to mitigate asphaltene issues and enhance oil upgrading. Experiments using a high-pressure cell simulating reservoir environments were conducted with solvent-to-oil ratios of 3:1, 5:1, 7:1, and 9:1 at temperatures of 120 °C and 250 °C. Increasing the ratio from 3:1 to 7:1 significantly enhanced in-situ asphaltene precipitation, but further increase to 9:1 offered minimal additional benefit, indicating a plateau. Concurrently, the asphaltene content in upgraded oil decreased with higher ratios, stabilizing beyond 7:1. At 250 °C, a substantial reduction in total asphaltene content—averaging a 5.8 wt% decrease-was observed. The discovery of the plateau at 7:1 and the reduced asphaltene precipitation at elevated temperatures provides a novel perspective on balancing solvent use with operational efficiency. These findings contribute to cost-effective and environmentally sustainable practices in enhanced oil recovery operations. These findings identify an optimal solvent-to-oil ratio and temperature under reservoir conditions for maximizing asphaltene precipitation and minimizing asphaltene content in upgraded oil. Optimizing these parameters is crucial for effective asphaltene management and improving the efficiency of solvent-based enhanced oil recovery processes.</div></div>","PeriodicalId":19756,"journal":{"name":"Petroleum Research","volume":"10 3","pages":"Pages 537-542"},"PeriodicalIF":4.0,"publicationDate":"2025-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145120660","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}
Xuyue Chen, Rong Wang, Jin Yang, Deli Gao, Gengchen Li, Pengbo Li
{"title":"A new intelligent optimization method for drilling parameters of extended reach wells based on mechanical specific energy and machine learning","authors":"Xuyue Chen, Rong Wang, Jin Yang, Deli Gao, Gengchen Li, Pengbo Li","doi":"10.1016/j.ptlrs.2025.03.002","DOIUrl":"10.1016/j.ptlrs.2025.03.002","url":null,"abstract":"<div><div>Extended reach wells (ERWs) can efficiently develop offshore satellite oilfields, reduce development costs and improve economic benefits. However, owing to the complex geological conditions, it is difficult to determine the drilling parameters of extended reach drilling, which greatly restricts the rate of penetration (ROP) and increases the cost of drilling operations. In this paper, a new intelligent optimization method for drilling parameters of ERWs based on mechanical specific energy (MSE) and machine learning is proposed. Unlike conventional approaches, this method combines an ensemble regression (ER) model for predicting ROP with the non-dominated sorting genetic algorithm-II (NSGA-II) to optimize multiple objectives, including MSE, ROP, and unit footage cost (UFC). The results show that through the intelligent optimization of drilling parameters for extended reach drilling wells in Block M of Bohai Oilfield, the two decision variables of the weight on bit (WOB) and rotations per minute (RPM) are increased, MSE is constantly converging or even equal to the confined compressive strength (CCS) of the rock, UFC is reduced by nearly 51.57%, and ROP is increased by approximately 31.88%. The findings demonstrate the effectiveness of the approach in enhancing drilling efficiency and reducing operational costs, offering an innovative solution for the optimization of drilling parameters in ERWs.</div></div>","PeriodicalId":19756,"journal":{"name":"Petroleum Research","volume":"10 3","pages":"Pages 485-500"},"PeriodicalIF":4.0,"publicationDate":"2025-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145120677","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}
燃料化学学报Pub Date : 2025-09-01DOI: 10.1016/S1872-5813(25)60559-7
SONG Wenqian , WEN Yuxin , KANG Guojun , LI Dekang , HU Haoquan , JIN Lijun , LU Shijian , YAN Zhong , LIU Pengfei
{"title":"Catalytic desorption performance of CO2-rich amine solution over SO2− 4/TiO2-HZSM-5","authors":"SONG Wenqian , WEN Yuxin , KANG Guojun , LI Dekang , HU Haoquan , JIN Lijun , LU Shijian , YAN Zhong , LIU Pengfei","doi":"10.1016/S1872-5813(25)60559-7","DOIUrl":"10.1016/S1872-5813(25)60559-7","url":null,"abstract":"<div><div>Amine-based solution absorption method, as the most mature CO<sub>2</sub> capture technology, requires enhancing CO<sub>2</sub> desorption performance while reducing energy consumption in desorption. A series of SO2− 4/TiO<sub>2</sub>-HZSM-5 catalysts with different TiO<sub>2</sub> contents were prepared by sol-gel method using HZSM-5 as carrier and used in CO<sub>2</sub> catalytic desorption of <em>N</em>-methyl-diethanolamine and piperazine blended amine solution. Results indicated that catalyst performance can be regulated by changing the loading amount of TiO<sub>2</sub>. When the mass ratio of TiO<sub>2</sub> to HZSM-5 was 2/1, the resultant STH(2/1) catalyst had large mesoporous surface area and abundant acidic sites and exhibited excellent catalytic performance. Compared with non-catalytic system, CO<sub>2</sub> desorption amount of the entire desorption increased by 15.38% and relative heat duty decreased by 21.69%. Meanwhile, STH(2/1) exhibited good activity and stability after regeneration cycles and had no impact on CO<sub>2</sub> absorption performance. Larger mesoporous surface area of catalyst facilitated sufficient contact between reactants and acidic sites. Abundant amount of strong acid sites and Brønsted acid sites provided a large amount of H<sup>+</sup>, promoting the decomposition of carbamate and deprotonation of protonated amines. The combined action of mesoporous surface area, strong acid sites and Brønsted acid sites promoted CO<sub>2</sub> desorption. In addition, a possible mechanism for CO<sub>2</sub> desorption catalyzed by SO2− 4/TiO<sub>2</sub>-HZSM-5 was proposed.</div></div>","PeriodicalId":15956,"journal":{"name":"燃料化学学报","volume":"53 9","pages":"Pages 1342-1353"},"PeriodicalIF":0.0,"publicationDate":"2025-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145108398","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}
燃料化学学报Pub Date : 2025-09-01DOI: 10.1016/S1872-5813(25)60566-4
WANG Ji , MA Xu , GUO Hanghao , WANG Huixia , QU Yongping , JIAO Weizhou , MA Zhibin
{"title":"The effect of non-free calcium on dissolution-polymerization reaction mechanism of coal gasification slag","authors":"WANG Ji , MA Xu , GUO Hanghao , WANG Huixia , QU Yongping , JIAO Weizhou , MA Zhibin","doi":"10.1016/S1872-5813(25)60566-4","DOIUrl":"10.1016/S1872-5813(25)60566-4","url":null,"abstract":"<div><div>Coal gasification slag is an excellent raw material for preparation of cementitious materials. Due to the addition of calcium-based additives, the content of non-free calcium in silicon/aluminum-rich coal gasification slag is relatively high. Thus, the influence of non-free calcium on leaching of elemental and formation mechanisms of cementitious phase were investigated by this paper. The results indicate that non-free calcium primarily disrupts the Al−O−Al bridges in the aluminosilicate glass phase, leading to decreased polymerization degree of slag. The compressive strength of cementitious materials is affected by alkali activation concentration and polymerization degree of slag. Under low-alkali conditions, as the calcium content in the gasification slag increases, the compressive strength of the cementitious material increases firstly and then decreases. Increased calcium promotes leaching of Al, however, large amounts of dissolved calcium tend to form cementitious phases and Ca(OH)<sub>2</sub>, which can hinder leaching of ions and formation of gel. In high-alkali environments, non-free calcium enhances the compressive strength of cementitious material. Glass phase in slag was destroyed by OH⁻, and leaching rates of Si and Al in slag with high-calcium increase, which lead to more C-A-S-H in cementitious material. Additionally, elevated alkalinity promotes the crystallization of sodium-minerals such as zeolites and sodalite.</div></div>","PeriodicalId":15956,"journal":{"name":"燃料化学学报","volume":"53 9","pages":"Pages 1416-1426"},"PeriodicalIF":0.0,"publicationDate":"2025-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145108399","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}
Jianzhong Xu , Lingyue Lv , Zheyu Li , Xunqiang Mo , Mengxuan He , Yingchao Lin
{"title":"Effects of microplastic degradability and concentrations on antibiotic resistance genes between soil and phyllosphere","authors":"Jianzhong Xu , Lingyue Lv , Zheyu Li , Xunqiang Mo , Mengxuan He , Yingchao Lin","doi":"10.1016/j.emcon.2025.100564","DOIUrl":"10.1016/j.emcon.2025.100564","url":null,"abstract":"<div><div>Microplastics have emerged as significant environmental pollutants and notably facilitated the spread of antibiotic resistance genes (ARGs); however, their impacts and underlying mechanisms remain poorly understood. So, this study investigated the effects of different types of microplastics (biodegradable microplastics; PGA and non-degradable microplastics; HDPE) and their concentrations (0.5 %, 1.0 %, and 1.5 % w/w) on ARGs distribution and transfer between soil and the phyllosphere, utilizing a greenhouse germination experiment. The results demonstrated that microplastic addition altered the characteristics of ARGs in both soil and phyllosphere. PGA, in particular, had a more pronounced effect on ARGs abundance in the phyllosphere. In soil, ARGs abundance were jointly regulated by both microplastic type and concentration: PGA exerted a stronger influence at lower concentrations, while HDPE had a greater effect at higher concentrations. Regardless of type or concentration, microplastic addition reduced microbial network modularity, leading to substantial shifts in ARGs community structure in both soil and phyllosphere. Notably, microplastic addition at 1 % concentration yielded the highest ARGs diversity in soil. Structural equation model revealed that microplastic types and concentrations influenced ARGs transfer via distinct pathways by changing soil physicochemical properties and microbial diversity. Specifically, PGA increased soil electrical conductivity (EC) and dissolved organic carbon (DOC) to influence ARGs, while HDPE primarily affected ARGs through alterations in soil pH, available phosphorus (AP), and available potassium (AK). These findings can offer important insights into the mechanisms by which microplastics influence ARGs dissemination in terrestrial ecosystems.</div></div>","PeriodicalId":11539,"journal":{"name":"Emerging Contaminants","volume":"11 4","pages":"Article 100564"},"PeriodicalIF":6.9,"publicationDate":"2025-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145095451","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Hu Zhou , Ange Lu , Cheng Zheng , Yiwen Wang , Xiangshao Kong , Weiguo Wu
{"title":"Experimental and numerical approach of afterburning effects in fuel-rich explosives within confined spaces","authors":"Hu Zhou , Ange Lu , Cheng Zheng , Yiwen Wang , Xiangshao Kong , Weiguo Wu","doi":"10.1016/j.dt.2025.05.009","DOIUrl":"10.1016/j.dt.2025.05.009","url":null,"abstract":"<div><div>The detonation of fuel-rich explosives yields combustible products that persistently burn upon mixing with ambient oxygen, releasing additional energy through a phenomenon known as the afterburning effect. This process greatly influences the evolution of confined blast loading and the subsequent structural response, which is crucial in confined blast scenarios. Given the complex nature of the reaction process, accurate analysis of the afterburning effect remains challenging. Previous studies have either overlooked the mechanisms of detonation product combustion or failed to provide experimental validation. This study introduces a three-dimensional model to effectively characterize the combustion of detonation products. The model integrates chemical reaction source terms into the governing equations to consider the combustion processes. Numerical simulations and experimental tests were conducted to analyze the combustion and energy release from the detonation products of fuel-rich explosives in confined spaces. Approximately 50% of the energy was released during the combustion of detonation products in a confined TNT explosion. Although the combustion of these products was much slower than the detonation process, it aligned with the dynamic response of the structure, which enhanced the explosive yield. Excluding afterburning from the analysis reduced the center-point deformation of the structure by 30%. Following the inclusion of afterburning, the simulated quasi-static pressure increased by approximately 45%. Subsequent comparisons highlighted the merits of the proposed approach over conventional methods. This approach eliminates the reliance on empirical parameters, such as the amount and rate of energy release during afterburning, thereby laying the foundation for understanding load evolution in more complex environments, such as ships, buildings, and underground tunnels.</div></div>","PeriodicalId":58209,"journal":{"name":"Defence Technology(防务技术)","volume":"51 ","pages":"Pages 67-79"},"PeriodicalIF":5.9,"publicationDate":"2025-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145097692","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}
{"title":"Linear WDE for performance enhancement of MIMO-OFDM system in the presence of Co-CFO","authors":"Khaled Ramadan , Emad S. Hassan","doi":"10.1016/j.dt.2025.05.011","DOIUrl":"10.1016/j.dt.2025.05.011","url":null,"abstract":"<div><div>The Discrete Walsh Hadamard Transform (DWHT) has emerged as an efficient alternative to the Discrete Fourier Transform (DFT) for Orthogonal Frequency Division Multiplexing (OFDM) implementations, particularly in handling channel impairments. In this article, we proposed an efficient Joint Low Complexity Regularized Zero Forcing-Wavelet Domain Equalizer (JLCRLZF-WDE) to replace the traditional Frequency Domain Equalizer (FDE) in DWHT-OFDM systems. Unlike FDE, which requires additional DFT and Inverse DFT (IDFT) computations, the proposed JLCRLZF-WDE directly operates in the Walsh domain, effectively mitigating the computational overhead. The derivation of the proposed JLCRLZF-WDE equations take the effect of the channel, Co-Carrier Frequency Offset (Co-CFO), as well as the noise into account. During the derivation of the system model equations, we assume a Multiple-Input-Multiple-Output (MIMO)-OFDM communication system through a Rayleigh fading channel. The Bit Error Rate (BER) performance and computational complexity of the proposed and the conventional algorithms are compared, indicating the significance of the proposed algorithm. Simulation results confirm the superiority of the proposed equalizer, demonstrating a 23.68%–28.4% reduction in computational complexity compared to Minimum Mean Square Error (LMMSE)-FDE based on DFT, while maintaining comparable BER performance at various MIMO configuration. Furthermore, at a BER of 10<sup>−4</sup>, the JLCRLZF-WDE achieves performance parity with conventional Walsh domain LMMSE equalizers, whereas other equalizers require an additional Signal-to-Noise Ratio (SNR) of 3.06 dB to achieve the same performance.</div></div>","PeriodicalId":58209,"journal":{"name":"Defence Technology(防务技术)","volume":"51 ","pages":"Pages 51-66"},"PeriodicalIF":5.9,"publicationDate":"2025-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145097690","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}
燃料化学学报Pub Date : 2025-09-01DOI: 10.1016/S1872-5813(25)60551-2
NIU Mufan, SHEN Baojian
{"title":"Research progress on Cr-based catalysts for the CO2-assisted catalytic oxidative dehydrogenation of light alkanes to light olefins","authors":"NIU Mufan, SHEN Baojian","doi":"10.1016/S1872-5813(25)60551-2","DOIUrl":"10.1016/S1872-5813(25)60551-2","url":null,"abstract":"<div><div>Under the background of rapid consumption of crude oil and the impact of the “dual carbon” policy, utilizing light alkanes, which have a wider range of sources, as starting materials to prepare light olefins through dehydrogenation has become the most promising way to solve the problem of insufficient feedstock supply. Cr-based catalysts are attractive for their high activity and low cost. This paper reviews the current state of research on different process routes for the dehydrogenation of light alkanes to olefins, the reaction mechanism of oxidative dehydrogenation over Cr-based catalysts as well as the active sites were investigated and reviewed. CO<sub>2</sub> as a weak oxidant in light alkanes dehydrogenation can alleviate the thermodynamic equilibrium limit, effectively inhibit the coking, decrease the reaction temperature and reduce energy consumption. In addition, Cr-based catalyst supports have been summarized and systematically classified. The interaction between Cr species and supports can be improved by introducing metal additives and modifying the supports, which in turn affects the dispersion and the state of Cr species. Finally, future challenges and directions for developing Cr-based catalysts for further industrial applications are discussed.</div></div>","PeriodicalId":15956,"journal":{"name":"燃料化学学报","volume":"53 9","pages":"Pages 1283-1299"},"PeriodicalIF":0.0,"publicationDate":"2025-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145108397","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}