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基于稀疏重构注意力机制的绝缘子缺陷检测方法

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广东电力 2024年第5期37卷 104-111页

作者：刘敏周国亮王红旭郑怿国网冀北电力有限公司北京100053 国网冀北电力有限公司技能培训中心河北保定071051

针对当前输电线路绝缘子缺陷样本数量少、缺陷目标背景复杂干扰导致检测过程中出现的特征冗余以及检测精度低等问题,提出基于稀疏重构注意力(sparse reconstruction dual attention,SRDA)机制的目标检测模型。首先,为了降低深层特征冗... 详细信息

针对当前输电线路绝缘子缺陷样本数量少、缺陷目标背景复杂干扰导致检测过程中出现的特征冗余以及检测精度低等问题,提出基于稀疏重构注意力(sparse reconstruction dual attention,SRDA)机制的目标检测模型。首先,为了降低深层特征冗余对模型的影响,采用稀疏重构机制对模型的深层特征层进行筛选和过滤;其次,为了增强模型对不同背景下目标区域的表达能力,提出位置注意力机制来捕获浅层特征目标区域的上下文信息,并引入通道注意力机制在深层特征层上加强对特定类别语义的特征表示,增强缺陷目标的语义信息;最后,通过对无人机拍摄采集的输电线路绝缘子图像进行缺陷检测实验,证明该模型能够获取精确的缺陷特征,提高绝缘子缺陷检测精度,与其他模型相比,该模型具有一定的优越性。

关键词：稀疏重构绝缘子缺陷检测注意力机制语义信息

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医药学实验室潜在的生物安全风险与防范措施

中国比较医学杂志 2024年第4期34卷 109-113页

作者：陈沫陶佳颐王宏旭张庆建中国医学科学院药物研究所条件设备处北京100050

医药学研究实验室涉及的研究领域十分宽泛,实验中应用的多种材料包括动物、微生物及纳米颗粒物等,所产生的废弃物也日益增多,存在着一定的生物安全隐患。本文概述了基因扩增、基因重组、病原微生物研究、纳米研究、动物实验、基因编辑... 详细信息

医药学研究实验室涉及的研究领域十分宽泛,实验中应用的多种材料包括动物、微生物及纳米颗粒物等,所产生的废弃物也日益增多,存在着一定的生物安全隐患。本文概述了基因扩增、基因重组、病原微生物研究、纳米研究、动物实验、基因编辑动物及实验废弃物等的潜在安全风险,提出了从制定严格的规章管理制度和完善硬件设施、加强教育培训、增强安全防范意识为主导的实验室生物安全风险防范措施。

关键词：医药学研究实验室生物安全安全管理

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脂肪酸代谢对骨质疏松骨骼细胞的影响及中西医干预研究

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中国骨质疏松杂志 2024年第2期30卷 228-233页

作者：曹奇孙广江戚晓楠智猛那俊夫王洪旭姚啸生辽宁中医药大学辽宁沈阳110847 辽宁中医药大学附属医院辽宁沈阳110000

脂肪酸代谢包括脂肪酸的合成、吸收、氧化和衍生,在细胞和器官水平上发挥着重要的作用。近年来的研究发现,骨质疏松模型的骨骼细胞中发生了脂肪酸代谢的特征性改变,提示脂肪酸代谢异常可能为骨质疏松症的发病机制之一。因此本文重点探... 详细信息

脂肪酸代谢包括脂肪酸的合成、吸收、氧化和衍生,在细胞和器官水平上发挥着重要的作用。近年来的研究发现,骨质疏松模型的骨骼细胞中发生了脂肪酸代谢的特征性改变,提示脂肪酸代谢异常可能为骨质疏松症的发病机制之一。因此本文重点探讨脂肪酸代谢途径在调节骨质疏松症中成骨细胞、破骨细胞等特定细胞的功能及相关的病理细胞反应中的作用,并总结基于脂肪酸代谢途径的骨质疏松潜在治疗药物,为骨质疏松症的治疗提供科学依据。

关键词：骨质疏松症脂肪酸成骨细胞破骨细胞

Numerical modeling of contaminant advection impact on hydrodynamic diffusion in a deformable medium

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Journal of Rock Mechanics and Geotechnical Engineering 2022年第3期14卷 994-1004页

作者： Chunguang wang Shuqing Liu Xingkai Shi Guanglei Cui hongxu wang Xing Jin Kunkun Fan Songtao Hu College of Energy and Mining Engineering Shandong University of Science and TechnologyQingdao266590China Key Laboratory of Ministry of Education on Safe Mining of Deep Metal Mines Northeastern UniversityShenyang110004China Shandong Provincial Geo-Mineral Engineering Co. Ltd.Jinan250013China

The self-weight of solid waste or machine-rolled compaction can induce or trigger contaminant migration in the *** the consolidation-induced hydraulic gradient driving solution transport has been extensively investigated,little attention has been paid to ion migration caused by its concentration gradient *** is necessary to more precisely predict the multi-stage contaminant transports in deforming porous *** on the modified Cam-clay model,the proposed fluid-solid coupled model can simulate the elastoplastic deformation behavior of layered kaolinite and KBr solution transport/sorption,and its modeling results were validated by published laboratory *** solid-fluid interactions were analyzed by comparing various transport manners of K^(+)and Br^(−)from excess pore pressure generation to *** reveal that the consolidation process can accelerate KBr solute advection from the contaminated layer into the uncontaminated layer,and then affects the subsequent diffusion,mechanical dispersion and sorption for K^(+)and Br^(−).The simulations also indicate that consolidation-induced solute transport is time-dependent,and therefore the ion diffusion and mechanical dispersion should receive more attention.

关键词： Consolidation Advection Diffusion Sorption

Revaluating coal permeability-gas pressure relation under various gas pressure differential conditions

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International Journal of Coal Science & Technology 2023年第4期10卷 203-216页

作者： Chunguang wang hongxu wang Derek Elsworth Guanglei Cui Bingqian Li Meng Zhou Wenxin Li Jiyuan Zhang College of Energy and Mining Engineering Shandong University of Science and TechnologyQingdao 266590China Energy and Mineral Engineering GeosciencesG3 Centerand EMS Energy InstitutePennsylvania State UniversityUniversity ParkPAUSA Key Laboratory of Ministry of Education On Safe Mining of Deep Metal Mines Northeastern UniversityShenyang 110004China Pingdingshan Tianan Coal Mining Co. LTDPingdingshanHenan 467003China School of Petroleum Engineering China University of Petroleum(East China)Qingdao 266580China

Identifying changes in coal permeability with gas pressure and accurately codifying mean efective stresses in laboratory samples are crucial in predicting gas-fow behavior in coal reservoirs. Traditionally, coal permeability to gas is assessed using the steady-state method, where the equivalent gas pressure in the coal is indexed to the average of upstream and downstream pressures of the coal, while ignoring the nonlinear gas pressure gradient along the gas fow path. For the fow of a compressible gas, the traditional method consistently underestimates the length/volume-averaged pressure and overestimates mean efective stress. The higher the pressure diferential within the sample, the greater the error between the true mean pressure for a compressible fuid and that assumed as the average between upstream and downstream pressures under typical reservoir conditions. A correction coefcient for the compressible fuid pressure asymptotes to approximately 1.3%, representing that the error in mean pressure and efective stress can be on the order of approximately 30%, particularly for highly pressure-sensitive permeabilities and compressibilities, further amplifying errors in evaluated reservoir properties. We utilized this volume-averaged pressure and efective stress to correct permeability and compressibility data reported in the literature. Both the corrected initial permeability and the corrected pore compressibility were found to be smaller than the uncorrected values, due to the underestimation of the true mean fuid pressure, resulting in an overestimation of reservoir permeability if not corrected. The correction coefcient for the initial permeability ranges from 0.6 to 0.1 (reservoir values are only approximately 40% to 90% of laboratory values), while the correction coefcient for pore compressibility remains at approximately 0.75 (reservoir values are only approximately 25% of laboratory value). Errors between the uncorrected and corrected parameters are quantifed un

关键词： Gas compressibility Coal permeability Pressure diferential Mean gas pressure

Dynamic analysis of heat extraction rate by supercritical carbon dioxide in fractured rock mass based on a thermal-hydraulic-mechanics coupled model

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International Journal of Mining Science and Technology 2022年第2期32卷 225-236页

作者： Chunguang wang Xingkai Shi Wei Zhang Derek Elsworth Guanglei Cui Shuqing Liu hongxu wang Weiqiang Song Songtao Hu Peng Zheng College of Energy and Mining Engineering Shandong University of Science and TechnologyQingdao 266590China New-energy Development Center of Sinopec Shengli Oilfield Dongying 257001China Energy and Mineral Engineering and G3 Center Penn State UniversityUniversity ParkPA 16802USA Key Laboratory of Ministry of Education on Safe Mining of Deep Metal Mines Northeastern UniversityShenyang 110004China Shandong Provincial Geo-Mineral Engineering Co. LtdJinan 250013China Qingdao Wofu New Energy Science and Technology Co. LtdQingdao 266010China

Heat production from geothermal reservoirs is a typical heat transfer process involving a cold working fluid contacting a hot rock *** to the thermal-physical characteristics of water,supercritical CO_(2)(scCO_(2))has a higher heat storage capacity over a wide temperature-pressure range and may be favored as a heat transfer *** characteristic of scCO_(2)-based heat extraction is that the hydraulic-thermal properties of the scCO_(2) vary dramatically and dynamically with the spatial pressure gradient during unsteady-state flow along *** highly nonlinear behavior presents a challenge in the accurate estimation of heat extraction efficiency in scCO_(2)-based *** this paper,a thermal-h ydraulic-mechanical(THM)coupled model is developed by considering deformation of the fractured reservoir,non-Darcy flow and the varying thermal-physical properties of scCO_(2).The proposed model is validated by matching the modeling temperature distribution with published *** results show that during continuous injection of scCO_(2),the fracture first widens and then narrows,ultimately reopening over the long *** sequential fracture deformation behaviors are in response to the combined impacts of mechanical compression and thermally-induced *** controlling the injection parameters of the scCO_(2),it is found that the heat extraction rate is positively correlated to its pore pressure or mass flow *** heat extraction rate can be significantly enhanced,when the inlet temperature of scCO_(2) is below its critical *** a result,the heat increment recovered per unit mass of scCO_(2) decreases as the hot rock is gradually ***,the heat increment recovered per unit mass of scCO_(2) decreases by increasing the inlet temperature of scCO_(2) or its mass flow rate,but increases as the outlet pressure ***,multi-linear regression indicates that controlling the inlet temperature of the scCO_(2) can sig

关键词： Supercritical CO_(2) Heat extraction Hot rock Geothermal energy Fracture-matrix interaction

Ballistic impact response of flexible and rigid UHMWPE textile composites:Experiments and simulations

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Defence Technology（防务技术） 2023年第4期22卷 37-53页

作者： hongxu wang Dakshitha Weerasinghe Paul J.Hazell Damith Mohotti Evgeny V.Morozov Juan P.Escobedo-Diaz School of Engineering and Information Technology The University of New South WalesCanberraACT2600Australia

This study elaborates on the effects of matrix rigidity on the high-velocity impact behaviour of UHMWPE textile composites using experimental and numerical *** composite samples were manufactured of a plain-weave fabric(comprising Spectra?1000 fibres)and four different matrix ***-velocity impact tests were conducted by launching a spherical steel projectile to strike on the prepared samples via a gas *** experimental results showed that the textile composites gradually changed from a membrane stretching mode to a plate bending mode as the matrix rigidity and thickness *** composites deformed in the membrane stretching mode had higher impact resistance and energy absorption capacity,and it was found that the average energy absorption per ply was much higher in this mode,although the number of broken yarns was smaller in the perforated ***,the flexible matrix composites always had higher perforation resistance but larger deformation than the rigid matrix counterparts in the tested thickness and velocity range.A novel numerical modelling approach with enhanced computational efficiency was proposed to simulate textile composites in mesoscale *** simulation results revealed that stress and strain development in the more rigid matrix composite was localised in the vicinity of the impact location,leading to larger local deformation and inferior perforation resistance.

关键词： Impact behaviour Textile composite UHMWPE fibre Energy absorption Finite element analysis

哈茨木霉菌剂处理对网纹甜瓜生长及品质的影响

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山西农业科学 2024年第2期52卷 44-49页

作者：王洪旭曲明山杨明宇曹跃董楚轩李婷北京农学院植物科学技术学院北京102206 北京市农业技术推广站北京100029 北京市密云区农业服务中心北京101599 北京市密云区农业技术推广站北京101599

为探究哈茨木霉不同浓度对网纹甜瓜植株生长、品质以及产量等相关指标产生的影响,筛选出可用于生产的最适哈茨木霉浓度,于定植当天和授粉后7 d内各施用1次0.15 g/m^(2)和0.30 g/m^(2)的哈茨木霉,活菌数相当于0.9亿个/m^(2)和1.8亿个/m^(... 详细信息

为探究哈茨木霉不同浓度对网纹甜瓜植株生长、品质以及产量等相关指标产生的影响,筛选出可用于生产的最适哈茨木霉浓度,于定植当天和授粉后7 d内各施用1次0.15 g/m^(2)和0.30 g/m^(2)的哈茨木霉,活菌数相当于0.9亿个/m^(2)和1.8亿个/m^(2),测定网纹甜瓜植株田间长势,包括叶面积、茎粗、株高,根系长势,包括根粗、根长、根系鲜质量和根系干质量,果品质量指标,包括单瓜质量、果实纵径、果实横径、果肉厚度及边部可溶性固形物含量和中心可溶性固形物含量,以及产量和商品率等指标。结果表明,施用哈茨木霉能显著提高网纹甜瓜株高、单瓜质量、果实纵径、根系鲜质量和根系干质量,提高产量及商品率,对网纹甜瓜植株及根系的生长具有一定的促进效果,并对网纹甜瓜品质及产量有一定的提升效果。其中,施用0.15 g/m^(2)哈茨木霉对网纹甜瓜植株田间长势、果品质量、产量及商品率的促进效果较好;施用0.30 g/m^(2)哈茨木霉对网纹甜瓜根系长势的促进效果较好。综合考虑,生产中网纹甜瓜施用0.15 g/m^(2)的哈茨木霉较为经济,更加符合我国目前绿色农业的总体要求,适宜推广使用。

关键词：网纹甜瓜哈茨木霉生长果品质量

NUMERICAL SIMULATION FOR SHAPE OF COLD ROLLING ALUMINUM STRIP ON 4-HIGH MILL WITH ROLL SHIFTED

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中国有色金属学会会刊：英文版 1998年第3期8卷 30-36页

作者： hongxu, wang Jianjun, Liu Jiachuang, Lian Junbo, Liu Yanshan Univ Qinhuangdao China

１ＩＮＴＲＯＤＵＣＴＩＯＮＡｓｔｈｅｍｉｌｗｉｔｈｒｏｌｓｈｉｆｔｅｄｈａｓｇｏｏｄｓｈａｐｅｃｏｎｔｒｏｌｃｈａｒａｃｔｅｒｉｓｔｉｃ，ｉｔｈａｓｂｅｅｎａｐｐｌｉｅｄｔｏｐｒｏｄｕｃｔｉｏｎｏｆｃｏｌｄｒｏｌ... 详细信息

１ＩＮＴＲＯＤＵＣＴＩＯＮＡｓｔｈｅｍｉｌｗｉｔｈｒｏｌｓｈｉｆｔｅｄｈａｓｇｏｏｄｓｈａｐｅｃｏｎｔｒｏｌｃｈａｒａｃｔｅｒｉｓｔｉｃ，ｉｔｈａｓｂｅｅｎａｐｐｌｉｅｄｔｏｐｒｏｄｕｃｔｉｏｎｏｆｃｏｌｄｒｏｌｅｄａｎｄｈｏｔｒｏｌｅｄｓｔｒｉ...

关键词： mill with roll shifted least square and collocation method variation method shape