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加强炼化企业危险化学品安全监管工作的有效措施

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石油化工安全环保技术 2024年第5期40卷 25-27,I0002页

作者：毛世宇中国石油大庆炼化公司安全环保处黑龙江大庆163000

危险化学品的安全监管工作与企业的安全生产和运行情况密切相关,要制定科学有效的监管措施,才能保证企业正常运行。通过对危险化学品储存过程中发生的危险和存在问题的剖析,提出了危险化学品安全监管过程中健全监督管理体制、提高监管... 详细信息

危险化学品的安全监管工作与企业的安全生产和运行情况密切相关,要制定科学有效的监管措施,才能保证企业正常运行。通过对危险化学品储存过程中发生的危险和存在问题的剖析,提出了危险化学品安全监管过程中健全监督管理体制、提高监管力度、加大信息化监管系统应用等措施。通过上述措施的综合实施,可以有效地加强炼化企业危险化学品安全监管工作,提高企业的安全生产水平。

关键词：危险化学品炼化企业监管措施

基于视觉传达的舰船航行图像中多目标检测方法

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舰船科学技术 2024年第16期46卷 170-173页

作者：吴军良毛丽青姜煜南昌交通学院人工智能学院江西南昌330100

针对海洋环境的复杂性以及舰船目标的多样性,研究基于视觉传达的舰船航行图像中多目标检测方法,及时发现潜在的安全隐患。将舰船航行图像从RGB颜色空间转换到CIE Lab模式空间,应用改进HFT(超复数傅里叶变换)模型有效提取舰船多目标显著... 详细信息

针对海洋环境的复杂性以及舰船目标的多样性,研究基于视觉传达的舰船航行图像中多目标检测方法,及时发现潜在的安全隐患。将舰船航行图像从RGB颜色空间转换到CIE Lab模式空间,应用改进HFT(超复数傅里叶变换)模型有效提取舰船多目标显著区域。利用加权处理和Otsu算法划分多层显著区域,并基于先验信息确定舰船多目标候选区域。采用模糊C均值聚类算法对候选区域进行分割,实现舰船多目标的精准检测。实验结果表明,该方法可在云雾覆盖、海洋杂波、船舶尾迹等多种复杂环境下准确检测舰船多目标,具有较高的鲁棒性和实用性。

关键词：视觉传达舰船图像多目标检测显著区域模糊C均值聚类候选区域

Preparation and Characterization of InAs/Si Composite Film

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Chinese Physics Letters 2000年第8期17卷 592-594页

作者： YANG Lin LI Guang-hai ZHENG mao-Jun ZHANG Li-de Institute of Solid State Physics Chinese Academy of SciencesHefei 230031

Composite thin films consisting of nanosized InAs particles embedded in amorphous Si matrices were prepared by radio frequency co-sputtering of InAs and Si.X-ray diffraction spectra show that the particle size of InAs increases with the increasing annealing temperature,while the particle sizes of In and As reach their maximum values at the temperature of 200℃,and decrease with the further increase of the annealing *** and As can not exist in the 500℃sample due to the sublimation of In and As and the reaction In+As→*** composition of the film in different levels was *** found that only in the deep level,the mole contents of As and In conform to the stoichiometric ratio and the oxidation occurs only a few nanometers from the *** believe that the scarcity of In and As near the surface is due to the sublimation of In and the oxide of As.

关键词： temperature. annealing sizes

Astrophysical applications of gravitational microlensing

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Research in Astronomy and Astrophysics 2012年第8期12卷 947-972页

作者： sh.de mao National Astronomical Observatories Beijing 100012 China

Since the first discovery of microlensing events nearly two decades ago, gravitational microlensing has accumulated tens of TBytes of data and developed into a powerful astrophysical technique with diverse applications. The review starts with a theoretical overview of the field and then proceeds to discuss the scientific highlights. （1） Microlensing observations toward the Magellanic Clouds rule out the Milky Way halo being dominated by MAssive Compact Halo Objects （MACHOs）. This confirms most dark matter is non-baryonic, consistent with other observations. （2） Microlensing has discovered about 20 extrasolar planets （16 published）, including the first two Jupiter-Saturn like systems and the only five ＂cold Neptunes＂ yet de- tected. They probe a different part of the parameter space and will likely provide the most stringent test of core accretion theory of planet formation. （3） Microlensing pro- vides a unique way to measure the mass of isolated stars, including brown dwarfs and normal stars. Half a dozen or so stellar mass black hole candidates have also been pro- posed. （4） High-resolution, target-of-opportunity spectra of highly-magnified dwarf stars provide intriguing ＂age＂ determinations which may either hint at enhanced he- lium enrichment or unusual bulge formation theories. （5） Microlensing also measured limb-darkening profiles for close to ten giant stars, which challenges stellar atmo- sphere models. （6） Data from surveys also provide strong constraints on the geometry and kinematics of the Milky Way bar （through proper motions）; the latter indicates predictions from current models appear to be too anisotropic compared with observa- tions. The future of microlensing is bright given the new capabilities of current surveys and forthcoming new telescope networks from the ground and from space. Some open issues in the field are identified and briefly discussed.

关键词： Galaxy: structure -- formation -- bulge -- gravitational lensing --planetary systems: formation

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猪伪狂犬病诊断方法与疫苗研究进展

动物医学进展 2024年第2期45卷 95-100页

作者：何松汤德元毛茵茗周飘陈阊峥罗柳陈旭廖正波袁盛林贵州大学动物科学学院贵州贵阳550025

猪伪狂犬病病毒(Pseudorabies virus, PRV)可引起妊娠母猪繁殖障碍和新生仔猪神经症状,可感染人类并引起脑炎,使感染者出现严重的神经症状,直接危害人类健康,因此对该病的研究具有重大意义。近年该病在世界范围内广泛分布,对世界养猪业... 详细信息

猪伪狂犬病病毒(Pseudorabies virus, PRV)可引起妊娠母猪繁殖障碍和新生仔猪神经症状,可感染人类并引起脑炎,使感染者出现严重的神经症状,直接危害人类健康,因此对该病的研究具有重大意义。近年该病在世界范围内广泛分布,对世界养猪业造成了巨大的经济损失,受到国内外学者的高度关注,对该病的研究也日益深入,在诊断方法及防控机制等方面取得了重要进展。论文就近年来猪伪狂犬病诊断方法及疫苗的发展进行综述,以期为在猪伪狂犬病诊断方法和疫苗选择上提供参考。

关键词：猪伪狂犬病诊断方法疫苗

贮藏温度对板栗果仁糖类物质含量和质地的影响

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粮食与油脂 2024年第9期37卷 63-69页

作者：黄秋伟龙凌云罗小杰金利刘功德毛立彦广西壮族自治区亚热带作物研究所广西南宁530001 农业农村部亚热带水果贮藏保鲜加工技术科研试验基地广西南宁530001 广西益香园食品有限公司广西河池547000 广西亚热带特色水果质量安全控制重点实验室广西南宁530001

为探究不同温度下板栗果仁在贮藏过程中糖类物质及质地的变化规律,以产自广西东兰县的野生板栗为试验材料,分析其在不同温度(25、8、4、-1℃)下贮藏45 d的理化品质和质构特性变化,并对理化指标和质构参数进行相关性和主成分分析。结果表... 详细信息

为探究不同温度下板栗果仁在贮藏过程中糖类物质及质地的变化规律,以产自广西东兰县的野生板栗为试验材料,分析其在不同温度(25、8、4、-1℃)下贮藏45 d的理化品质和质构特性变化,并对理化指标和质构参数进行相关性和主成分分析。结果表明:在0~45 d贮藏期内,-1℃贮藏的板栗果仁水分损失最少、硬度变化最小;在贮藏第40天时,-1℃贮藏的板栗果仁可溶性糖含量达到最高。相关性分析结果表明,在贮藏过程中,板栗果仁理化指标与其质构特性的相关性强弱依次为水分含量﹥可溶性糖含量﹥支链淀粉含量。主成分分析结果表明,第1主成分方差贡献率已超过50%,可作为评价板栗果仁贮藏品质的核心指标。

关键词：板栗贮藏温度糖类物质质地

Nondestructive Characterization of Quantitative Bonding Strength at a Bonded Solid-Solid Interface

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Chinese Physics Letters 2011年第8期28卷 153-156页

作者： CHEN Jian-Jun ZHANG de mao Yi-Wei CHENG Jian-Chun Institute of Acoustics Key Laboratory of Modern AcousticsNanjing UniversityNanjing 210093

We propose a nondestructive method to characterize the quantitative bonding strength at a bonded solid-solid interface by a contact acoustic nonlinearity(CAN)*** principle of the CAN microscope is briefly *** vibration amplitude of the incident focusing wave at the bonded interface is calculated,the standard bonding strength with a complete bonding state is established by the tension test,and the CAN parameter is *** quantitative contour of bonding strength at the interface could be *** experimental contours of two samples are also presented.

关键词： strength bonding interface

基于第三磨牙根管可见度判断华东地区个体是否年满18周岁

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法医学杂志 2024年第2期40卷 149-153页

作者：霍德民马开军徐敬兰宋旭毛晓燕刘夏赵开放张剑杜猛上海市公安局嘉定分局刑事科学技术研究所上海201822 上海市公安局物证鉴定中心上海200083 上海市嘉定区中医医院上海201800 上海市嘉定区牙病防治所口腔正畸科上海201800 上海市公安局青浦分局刑事侦查支队上海201700 上海市公安局浦东分局刑事科学技术研究所上海200135

目的研究华东地区个体下颌第三磨牙根管可见度的增龄性变化,探讨应用其判断个体是否年满18周岁的可行性。方法共收集1280例华东地区15~30周岁人群的口腔全景片,应用OLZE等提出的方法(0~34个阶段)评估所有口腔全景片中下颌第三磨牙根管... 详细信息

目的研究华东地区个体下颌第三磨牙根管可见度的增龄性变化,探讨应用其判断个体是否年满18周岁的可行性。方法共收集1280例华东地区15~30周岁人群的口腔全景片,应用OLZE等提出的方法(0~34个阶段)评估所有口腔全景片中下颌第三磨牙根管可见度,对各阶段的样本年龄分布进行描述性统计分析。结果男性首次出现阶段0、1、2、3的年龄分别为16.88、19.18、21.91、25.44岁,女性分别为17.47、20.91、22.01、26.01岁。所有样本中,阶段1~3的个体年龄均超过18周岁。结论基于口腔全景片中下颌第三磨牙根管可见度判断华东地区个体是否年满18周岁的方法具有一定的可行性。

关键词：法医人类学法医齿科学年龄推断第三磨牙牙根管口腔全景片

Phototropism of Thalli and Rhizoids developed from the Thallus Segments of Bryopsis hypnoides Lamouroux

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Journal of Integrative Plant Biology 2006年第6期48卷 686-691页

作者： Nai-Hao Ye Hong-Xia Wang Guang-Ce Wang Zheng-Quan Gao de-mao Li Yellow Sea Fisheries Research Institute Chinese Academy of Fishery Sciences Qingdao 266071 China Key Laboratory of Experimental Marine Biology Institute of Oceanology Chinese Academy of Sciences Qingdao 266071 China School of Life Sciences Shandong University of Technology Zibo 255049 China

Newly regenerated thalli were used to study the phototropism of Bryopsis hypnoides Lamouroux under different qualities of light. Positive phototropism in the thalli and negative phototropiam In the rhizoida of B. hypnoides were investigated and analyzed in terms of bending. Both thaiii and rhlzoids developed from thallus segments exhibited typical tip growth, and their photoreceptive sites for phototroplam were also restricted to the apical hemisphere. The bending curvature of rhizoids and thalli were determined with unilateral lights at various wavelengths and different fluence rates after a fixed duration of Illumination. The trends of bending from the rhizoid and thallus were coincident, which showed that the action spectrum had a large range, from ultraviolet radiation （366.5 nm） to green light （524 nm）. Based on the bending curvatures, blue light had the highest efficiency, while the efficiency of longer wavelengths （〉500 nm） was significantly lower. External Ca^2＋ had no effect on the bending curvature of thalli and rhlzolda. Blue light （440 nm） induced thallus branching from rhizoids, while red light （650 nm） had no such effect. Fast-occurring chloroplast accumulation In the outermost cytoplasmic layer of the blue light （440 nm）-Irradiated region In the rhizoid was observed, from which protrusions （new thalli） arose after 4 h of the onset of illumination, and this action was thought to be driven by the dynamics of actin microfilamenta.

关键词： Bryopsis hypnoides chloroplast accumulation phototropism rhizoid thallus