用于闪光图像消噪的改进BM3D方法

高斯噪声是闪光图像中的主要噪声,将在密度反演等后续处理中被放大,严重影响密度重建及客体边界提取结果,因此,消高斯噪声是闪光图像消噪研究的重点内容。针对闪光照相图像噪声及照相客体轴旋转对称的特点,研究了基于三维块匹配滤波(Block Matching and 3D Filtering,BM3D)的闪光照相图像消噪算法,针对闪光照相图像中难以获得更高质量相似块的缺陷,在不破坏噪声独立性的情况下,通过对含噪退化图像进行旋转与镜像操作,增加了提供相似块的图像来源。同时,通过引入图像块的灰度变换,降低了原有相似性要求中的灰度值要求,提高了形状相似的要求,增加了获得高质量相似块的能力。图像的消噪结果表明,由于相似块的质量得到保证,用于闪光图像消噪的改进BM3D方法取得了更好的消噪效果。

BMS电路板多模块协同热-力耦合建模及仿真分析

针对现有电动汽车电池管理系统(BMS)电路板研究仅仅考虑单一功能模块的温度场及其散热效果,缺乏考虑BMS多个功能模块在温度场和力场下的相互影响及协同效应的研究的情况,以某商用BMS电路板为研究对象,采用ANSYS构建了表征BMS多模块协同作用下的热-力耦合数值仿真分析模型并验证了其有效性.在此基础上,针对BMS电路板各功能模块温度场及热变形行为开展了数值仿真研究.结果表明:BMS电路板温度分布不均,最大温差达20.5℃.均衡模块存在积热,温度高达54.4℃.高温导致电路板组件发生热膨胀变形,同时电路板约束诱发均衡模块及供电模块边缘的贴片电阻出现热应力集中,两者共同作用致使BMS均衡模块、供电模块产生凸起翘曲变形,且Z轴热变形量随着温度升高而增大,最大变形量达9.5μm,应针对BMS电路板上积热模块开展散热优化设计.

被建构的身体景观:“BM风”流行下青年女性审美异化现象研究

新媒介时代开启了网络审美的新纪元,大众媒介与消费主义合力构建了当代审美新景观。在众多美丽元素中,女性的身体成为备受关注的焦点。近年来,一种主打“短紧露”风格的“BM式”小码穿搭流行于各大社交媒体平台,并受到千万年轻女性追捧与效仿。这种穿搭时尚实则反映了一种审美异化现象。主要表现在当代青年女性因追求理想化的身体在身材焦虑与安全感缺失心理下对“BM”式审美产生误同心理,进而在社交媒体平台上进行异化的身体展演。青年女性的审美异化主要源于大众媒介与消费社会的合谋:大众媒介建构的拟态审美环境为公众提供的美的身体范式,消费主义下的资本逻辑又将美进行量化与符号化。二者的合谋导致单一、病态的“BM”审美应运而生。这种畸形的审美不仅导致女性主体性的缺失,也有碍和谐网络空间和良好社会审美风尚的建设。因此,应致力于发扬多元、流动的美,建立一种合乎公序良俗的社会审美机制,还女性一份纯粹的美丽与自由。

基于自适应BM3D的绝缘子缺陷检测图像降噪方法

由于拍摄环境的影响,获取的图像中常常混有噪声,极易影响绝缘子缺陷检测的准确性。针对该问题,提出了一种自适应BM3D降噪方法。首先,引入基于噪声水平与图像块协方差矩阵特征值的统计关系的噪声估计算法,解决原始BM3D算法需要先验知识的问题;其次,以峰值信噪比为目标函数,通过量子遗传算法得到绝缘子图像在各个噪声强度下的参数最优值,包括基础估计中的硬阈值参数、距离阈值和最终估计中的距离阈值;最后,以噪声强度为自变量,采用多项式拟合的方式得到上述3个参数的拟合曲线,从而得到各个噪声强度下算法的最佳参数组合,实现BM3D算法在不同噪声水平下的参数快速自适应。对比实验的结果表明所提出的方法在直观视觉和客观评价指标上优于其他方法。当噪声标准差为25时,所提出的方法相较于原始BM3D算法在峰值信噪比、结构相似性和边缘保留指数指标上均有所提升,尤其是边缘保留指数提升近20%。在提升降噪效果的同时能够保留更多边缘细节,这有助于提高后续绝缘子识别及缺陷检测的效果。

基于EBM增材制造CoNi基高温合金组织与力学性能

增材制造技术为发展高性能高温合金材料及部件提供了新的途径。本工作开发一种适于增材制造工艺条件的γ′相强化CoNi基高温合金,并结合电子束熔化(electron beam melting,EBM)技术的工艺参数优化,制备出无裂纹的合金块体材料。结果表明:扫描速度为2000 mm/s时,合金孔隙率最低,约为0.14%;打印态CoNi基合金显微组织为沿<001>方向生长的柱状晶粒,平均晶粒宽度约为235μm,γ′相体积分数约为30%;经过热等静压及固溶时效处理后,孔隙率进一步降低至约0.09%,柱状晶粒基本没有变化;γ′相的平均尺寸为(70±18)nm,体积分数为(32±3.6)%。室温拉伸实验结果表明,增材制造γʹ相强化CoNi基高温合金展示出优异的强塑性配合,展示出良好的工业应用前景。

Lnc-BM通过FASTK/MT-ND6轴调节线粒体呼吸功能促进胃癌进展

目的探究Lnc-BM在胃癌发生发展中的作用及分子机制。方法收集36例胃癌患者的胃癌组织及配对的癌旁正常组织,RT-qPCR检测胃癌组织和癌旁正常组织中Lnc-BM的表达水平。构建Lnc-BM过表达或敲低细胞,平板克隆形成实验和CCK-8实验分析Lnc-BM对胃癌细胞增殖能力的影响,Transwell实验分析Lnc-BM对胃癌细胞迁移和侵袭能力的影响。RNA Pull-down实验分析Lnc-BM与FASTK蛋白的结合,Western blot检测Lnc-BM的表达对FASTK蛋白水平的影响。Western blot实验和Seahorse细胞能量代谢分析检测Lnc-BM过表达或敲降的胃癌细胞中线粒体相关蛋白的表达变化以及线粒体能量代谢的改变。裸鼠荷瘤实验进一步观察Lnc-BM对胃癌细胞体内生长的影响。结果Lnc-BM在胃癌组织中表达明显高于对应的癌旁正常组织。实验结果显示,过表达Lnc-BM促进胃癌细胞增殖、迁移和侵袭,敲低Lnc-BM抑制胃癌细胞增殖、迁移和侵袭(均P˂0.05)。RNA Pull-down结果显示,Lnc-BM可直接结合FASTK蛋白。Western blot实验结果显示,过表达Lnc-BM后FASTK蛋白水平升高,敲低Lnc-BM抑制FASTK蛋白表达(均P˂0.05)。与对照组相比,过表达Lnc-BM后,线粒体相关蛋白MT-ND6和TOM20表达升高(均P˂0.05)。Seahorse细胞能量代谢分析结果显示,Lnc-BM过表达显著提高细胞的线粒体呼吸能力(均P˂0.05)。在Lnc-BM稳定过表达细胞中敲低FASTK,可有效抑制Lnc-BM过表达细胞中增强的线粒体呼吸能力(均P˂0.05)。裸鼠皮下荷瘤实验显示,过表达Lnc-BM显著促进肿瘤生长(均P˂0.05)。结论Lnc-BM可通过FASTK/MT-ND6轴调节线粒体呼吸功能,促进胃癌进展。

电动汽车BMS从控板热分析及散热优化

针对电动汽车电池管理系统从控板服役过程中因温度过高和不均影响整车动力性、安全性问题,本文基于CFD理论,采用Icepak软件建立并验证了某商用BMS从控板热分析模型。首次在车载服役条件下,基于热分析模型开展了温度场分析和热均匀性优化研究。BMS从控板热仿真分析表明,均衡模块及供电模块因局部积热温度均超过BMS的设计温度限值60℃,整个BMS从控板最大温差为21.0℃。为此,进一步开展了BMS从控板散热路径分析,并通过改变均衡电阻间距、布局、PCB基材以及增设导热硅胶垫进行散热优化设计。提高了BMS从控板的散热能力,使BMS从控板的最高温度控制在设计规定值60℃以下,同时整个电路板的温差降为6.9℃,提高了BMS从控板在实际车载服役条件下的安全性和可靠性,可望为BMS从控板热设计与优化提供理论方法。

BM-MSCs延缓CD8^(+)初始T细胞衰老

目的验证骨髓间充质干细胞(BM-MSCs)缓解免疫衰老的作用,探究其衰老改善的主要免疫细胞群体。方法分离获得小鼠脾淋巴细胞,刺激增殖7d构建复制性衰老细胞模型。利用流式细胞测量术检测年轻对照组、复制性衰老对照组和BM-MSCs共培养组T细胞亚群衰老标志物p16ink4a(p16)和p21cip1(p21)的表达水平。结果T淋巴细胞复制性衰老模型中观察到持续增殖后CD8^(+)T细胞较CD4^(+)T细胞衰老显著,在CD8^(+)T细胞的初始细胞、效应细胞亚群中,效应细胞衰老最显著;BM-MSCs共培养对衰老的效应细胞没有明显影响,主要通过延缓初始T细胞的衰老,达到缓解CD8^(+)T细胞衰老的作用(P<0.01,P<0.001)。结论与BM-MSCs共培养可以缓解T细胞的复制性衰老表型,对CD8^(+)T细胞的抗衰作用更显著,主要通过抑制初始T细胞的衰老实现。

一种基于BM3D算法改进的图像去噪方法

在图像处理领域中,三维块匹配算法(BM3D)算法结合了空间域与频率域的相关特性,是当前图像去噪效果最好的算法之一。由于该算法存在计算耗时长、相似块提取不够准确、分割块内分布不同的相似特征无法提取等问题,论文提出基于Radon变换进行图像信息降维,并通过求解降维函数的方差值、以及方差最大值坐标定位进行相似块信息的判断,再计算各相似块相对参考块的像素均值比例,并放缩再用于去噪。实验结果显示,优化算法去噪图像相较于原算法去噪图像运行时间减短,图像质量提升。

基于改进BM3D的乳腺超声图像去噪算法研究

低噪声、高对比度的超声图像能极大提高医生对病情诊断的准确率。为解决乳腺超声图像在采集和传输过程中引入散斑噪声而导致图像质量恶化从而影响乳腺癌早期诊断的问题,提出一种基于改进BM3D的乳腺超声图像去噪算法。首先引入基于DBSCAN的超像素分割方法,对原图进行超像素分割得到相应的超像素标签矩阵;然后利用超像素标签矩阵引导BM3D算法中的块匹配过程,一方面可以减少待匹配块的搜索时间,另一方面可以给相似块度量提供辅助信息,进而提高块匹配的准确性;最后改进BM3D算法中的硬阈值滤波,采用自适应噪声参数估计进一步提升去噪效果。实验结果表明,改进BM3D算法的等效视数相较传统BM3D算法提高了1.75%,边缘保持指数提高了2.56%,而算法处理时间却减少了51.26%,说明其是一种兼顾去噪效果与运行时间的实用方法。

增强光催化产氢的TiO_(2)/BMS复合材料的制备及评价

利用改进的溶胶-凝胶法合成了TiO_(2)/BMS复合材料,并以这些复合材料为光催化剂,研究了其光催化产氢的性能。结果显示,在最优条件下,TiO_(2)/BMS复合材料光催化产氢速率是TiO_(2)的3.7倍。研究表明,TiO_(2)/BMS复合材料是一种优秀的光催化剂,可用于光催化水分解产氢。

Editorial for Multiscale&Multifield Coupling in Geomechanics

We are delighted to serve as guest editors for this special issue in the Journal of Rock Mechanics and Geotechnical Engineering.The purpose of this special issue is dedicated to gathering the latest research work on Multiscale&Multifield Coupling in Geomechanics,where we delve into the intricate interplay of various fields and scales that govern the behavior of geomaterials.In total,30 manuscripts from USA,China,UK,Germany,Canada,India and United Arab Emirates are selected to be included in this issue.

浅析BMS电池管理系统高精度电流检测

在全球环境保护和可持续发展议题日益受到重视的背景下,新能源汽车已逐渐成为未来交通领域的关键发展方向。本文主要探讨了电池管理系统(BMS)的高精度电流检测技术。通过分析BMS电池管理系统的关键特性,强调了高精度电流检测对电池性能和安全的重要性。文章介绍了磁通门技术的优势及其在高精度电流测量中的应用,指出该技术在降低零点误差、提高SOC精度以及系统安全性方面的突出表现。此外,浙江巨磁智能技术有限公司开发的CSM系列电流传感器,基于其自主知识产权的iFluxgate技术,展示了高精度、低温漂、发热量低等优点,在电动汽车及储能设备中具有广泛应用前景。

电动汽车BMS的电源休眠和唤醒系统技术研究

文章主要介绍电动汽车电池管理系统BMS的电源休眠和唤醒系统的现状方案及主要问题,重点分析新型电源休眠和唤醒系统技术方案在BMS中的应用,阐明该技术方案的优势,为电动汽车的电池管理系统开发提供参考。

The Middle Miocene lobe-shaped and band-shaped submarine fans in the Lingshui Sag,Qiongdongnan Basin:source-to-sink system,genesis and implication

Deepwater oil and gas exploration is the key to sustainable breakthroughs in petroleum exploration worldwide.The Central Canyon gas field has confirmed the Lingshui Sag is a hydrocarbon-generating sag,and the deepwater reservoirs in the Lingshui Sag still have more fabulous oil and gas exploration potential.Based on drilling data and three-dimensional(3D)seismic data,this paper uses seismic facies analysis,seismic attribute analysis,and coherence slice analysis to identify the types of submarine fans(lobe-shaped and band-shaped submarine fans)that developed in the Lingshui Sag during the Middle Miocene,clarify the source-to-sink system of the submarine fans and discuss the genesis mechanism of the submarine fans.The results show that:(1)the deepwater source-to-sink system of the Lingshui Sag in the Middle Miocene mainly consisted of a“delta(sediment supply)-submarine canyon(sediment transport channel)-submarine fan(deepwater sediment sink)”association;(2)the main factor controlling the formation of the submarine fans developed in the Lingshui Sag was on the relative sea level decline;and(3)the bottom current reworked the lobe-shaped submarine fan that developed in the northern Lingshui Sag and formed the band-shaped submarine fan with a greater sand thickness.This paper aims to provide practical geological knowledge for subsequent petroleum exploration and development in the deepwater area of the Qiongdongnan Basin through a detailed analysis of the Middle Miocene submarine fan sedimentary system developed in the Lingshui Sag.

Induction System for a Fusion Reactor: Quantum Mechanics Chained up

In the quest for a sustainable and abundant energy source, nuclear fusion technology stands as a beacon of hope. This study introduces a groundbreaking quantum mechanically effective induction system designed for magnetic plasma confinement within fusion reactors. The pursuit of clean energy, essential to combat climate change, hinges on the ability to harness nuclear fusion efficiently. Traditional approaches have faced challenges in plasma stability and energy efficiency. The novel induction system presented here not only addresses these issues but also transforms fusion reactors into integrated construction systems. This innovation promises compact fusion reactors, marking a significant step toward a clean and limitless energy future, free from the constraints of traditional power sources. This revolutionary quantum induction system redefines plasma confinement in fusion reactors, unlocking clean, compact, and efficient energy production.

基于微服务架构的电力检修用移动锂电池BMS平台设计

设计了一种基于微服务架构的移动锂电池BMS平台,这种架构能够针对电力系统检修的需要提供灵活、可伸缩和可维护的服务。阐述了微服务架构与电力检修移动锂电池BMS平台的关系,分析了BMS平台的架构设计、接口设计、性能指标及应用场景,并通过实际应用数据验证了其有效性。

MST1R抑制剂BMS-777607对卵巢癌SKOV3细胞增殖、凋亡的影响

目的探讨在卵巢癌SKOV3细胞中应用MST1R抑制剂BMS-777607并观察对其增殖及凋亡的影响,阐明其作用机制。方法根据是否对卵巢癌SKOV3细胞进行加药处理将实验分为对照组(DMSO)、实验组(BMS-777607)。将卵巢癌SKOV3细胞用不同浓度的BMS-777607进行处理,并使用MTT实验、克隆形成实验和EdU细胞成像检测细胞增殖率,采用流式实验检测细胞凋亡率,使用Western Blot实验检测细胞中Bax、p-ERK蛋白表达水平。结果MTT实验显示与对照组比较,实验组卵巢癌SKOV3细胞随着药物浓度的升高,其增殖率明显下降(P<0.05)。流式细胞术实验显示,实验组卵巢癌SKOV3细胞凋亡比例明显增加(P<0.05)。由Western Blot实验显示,与对照组相比,实验组卵巢癌SKOV3细胞中Bax蛋白表达水平随药物浓度的升高而显著升高(P<0.01)。而p-ERK蛋白表达水平则随药物浓度的升高却显著降低(P<0.05)。结论在卵巢癌SKOV3细胞中,应用MST1R抑制剂BMS-777607能够抑制细胞的增殖并诱导其凋亡。

Case study on the mechanics of NPR anchor cable compensation for large deformation tunnel in soft rock in the Transverse Mountain area,China

A study was conducted to analyze the deformation mechanism of strongly weathered quartz schist in the Daliangshan Tunnel,located in the western Transverse Mountain area.A large deformation problem was experienced during the tunnel construction.To mitigate this problem,a support system was designed incorporating negative Poisson ratio(NPR)anchor cables with negative Poisson ratio effect.Physical model experiments,field experiments,and numerical simulation experiments were conducted to investigate the compensation mechanical behavior of NPR anchor cables.The large deformations of soft rocks in the Daliangshan Tunnel are caused by a high ground stress,a high degree of joint fracture development,and a high degree of surrounding rock fragmentation.A compensation mechanics support system combining long and short NPR anchor cables was suggested to provide sufficient counter-support force(approximately 350 kN)for the surrounding rock inside the tunnel.Comparing the NPR anchor cable support system with the original support system used in the Daliangshan tunnel showed that an NPR anchor cable support system,combining cables of 6.3 m and 10.3 m in length,effectively prevented convergence of surrounding rock deformation,and the integrated settlement convergence value remained below 300 mm.This study provides an effective scientific basis for resolving large deformation problems in deeply buried soft rocks in western transverse mountain areas.

Characteristics of Rock Mechanics Response and Energy Evolution Regime of Deep Reservoirs in the Bozhong Sag,Bohai Bay Basin

Hydraulic fracturing is a mature and effectivemethod for deep oil and gas production,which provides a foundation for deep oil and gas production.One of the key aspects of implementing hydraulic fracturing technology lies in understanding mechanics response characteristics of rocks in deep reservoirs under complex stress conditions.In this work,based on outcrop core samples,high-stress triaxial compression tests were designed to simulate the rock mechanics behavior of deep reservoirs in Bozhong Sag.Additionally,this study analyzes the deformation and damage law for rock under different stress conditions.Wherein,with a particular focus on combining energy dissipation theory to further understand damage law for deep reservoirs.The experimental results show that regardless of stress conditions,the process of deformation/failure of deep-seated reservoirs goes through five stages:Fracture compaction,newfracture formation,stable fracture expansion,unstable fracture expansion,and post-peak residual deformation.Under different stress conditions,the energy change laws of specimens are similar.The energy dissipation process of rocks corresponds closely to the trend of deformation-failure curve,then displays distinctive stage characteristics.Wherein,in stage of rock fracture compaction,the input energy curve is approximately coincident with the elastic strain energy curve,while the dissipation energy curve remains near zero.With the increase of strain,the growth rate of elastic strain energy increases gradually,but with the deformation entering the crack propagation stage,the growth rate of elastic strain energy slows down and the dissipation energy increases gradually.Finally,in the post-peak stage,rock fracture releases a lot of energy,which leads to the sharp decline of elastic strain energy curve.In addition,the introduction of damage variable D quantifies the analysis of the extent of failure for rocks.During the process of increasing strain,rock damage exhibits nonlinear growth with increasing stress.