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低分气脱硫塔入口分液罐切液线泄漏原因分析

全面腐蚀控制 2024年第8期38卷 126-128页

作者：黄新泉中国石油独山子石化公司研究院

本文通过对低分气脱硫塔入口分液罐切液线泄漏原因分析，从工艺参数、宏观检查、壁厚测试、断口微观形貌及能谱分析等几方面，对切液线开裂泄漏原因进行分析，分析切液线开裂泄漏原因主要是凝缩液腐蚀环境下冲蚀减薄开裂。管道开裂部位... 详细信息

本文通过对低分气脱硫塔入口分液罐切液线泄漏原因分析，从工艺参数、宏观检查、壁厚测试、断口微观形貌及能谱分析等几方面，对切液线开裂泄漏原因进行分析，分析切液线开裂泄漏原因主要是凝缩液腐蚀环境下冲蚀减薄开裂。管道开裂部位的机械损伤和安装残余应力加速了切液线的开裂泄漏。

关键词：低分气凝缩液开裂冲蚀防护建议

高寒草原退化过程中植被和土壤因子对微生物群落的交互影响

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环境科学 2024年第7期45卷 4251-4265页

作者：徐欢丁明军张华张月菊黄鹏吴宇萍邹天娥王能玉曾欢江西师范大学地理与环境学院南昌330022 江西师范大学鄱阳湖湿地与流域研究教育部重点实验室南昌330022

为了探明青藏高原高寒草原退化过程中植被和土壤因子对土壤微生物群落的调节作用,以青藏高原三江源区高寒草原为研究对象,分析了不同退化阶段(未退化、中度退化和重度退化)高寒草原植被及土壤因子的差异,利用高通量测序技术分析了不同... 详细信息

为了探明青藏高原高寒草原退化过程中植被和土壤因子对土壤微生物群落的调节作用,以青藏高原三江源区高寒草原为研究对象,分析了不同退化阶段(未退化、中度退化和重度退化)高寒草原植被及土壤因子的差异,利用高通量测序技术分析了不同退化阶段微生物群落特征,并借助冗余分析(RDA)和基于相似或相异度矩阵的多元回归(MRM)识别影响微生物(细菌和真菌)群落变化的关键环境因子.结果表明,高寒草原退化显著改变了群落盖度、高度、生物量及禾本科重要值,降低了土壤有机质、全氮、全磷含量和粉粒含量,增加了土壤容重和砂粒含量.退化并未改变细菌和真菌的组成,但改变了组成比例,导致了微生物丰富度(Chao1指数和Richness指数)的损失,但并未显著改变微生物多样性(Shannon指数),随着退化的发生,植被特征、土壤理化性质与微生物多样性呈现出了一致的变化趋势.结合网络拓扑变化特征(网络的节点数和聚类系数显著下降)发现,高寒草原退化导致了微生物的种间相互作用减弱,网络结构更加分散,微生物的分布趋向于均质化,但物种间的相互作用仍然以合作为主(网络正相关连接占比>90%).高寒草原退化过程中植被-土壤的耦合对土壤细菌群落的影响最大,而土壤理化性质对土壤真菌的群落影响最大.具体而言,植被群落高度、生物量及土壤容重是调节土壤微生物的共性因子,植被辛普森指数、禾本科重要值、土壤全磷、全钾和粉粒含量是影响土壤细菌群落的特有因子;而土壤pH和全氮含量是影响土壤真菌群落的特有因子.

关键词：退化高寒草原土壤微生物植被特征土壤理化性质共现网络

TLP扩散焊接工艺参数对GH5188高温合金接头微观组织及力学性能的影响

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航空学报 2024年第8期45卷 282-292页

作者：滕俊飞李家豪周惠焱伍大为徐海涛林铁松黄永德中国航空制造技术研究院航空焊接与连接航空科技重点实验室北京100024 南昌航空大学航空制造工程学院南昌330063 浙江工业大学化工机械设计研究所杭州310014 哈尔滨工业大学先进焊接与连接国家重点实验室哈尔滨150001

采用自主设计的KCo8钴基中间层对GH5188高温合金进行瞬间液相扩散连接,借助扫描电子显微镜(SEM)、能谱仪(EDS)及电子探针(EPMA)分析评估了瞬间液相扩散焊接工艺参数对接头微观组织的影响,探究了焊接工艺对接头的影响机理,采用电子万能... 详细信息

采用自主设计的KCo8钴基中间层对GH5188高温合金进行瞬间液相扩散连接,借助扫描电子显微镜(SEM)、能谱仪(EDS)及电子探针(EPMA)分析评估了瞬间液相扩散焊接工艺参数对接头微观组织的影响,探究了焊接工艺对接头的影响机理,采用电子万能试验机检测接头的力学性能进行评估并分析其断裂机理。结果表明,典型的接头主要由3种区域构成:GH5188合金(母材),M_(5)B_(3)、M_(3)B_(2)等析出相存在的扩散区和钴基固溶体构成的等温凝固区。扩散区的扩散行为与焊接工艺有关,随着焊接温度的升高或保温时间的延长,扩散区析出相的密集程度逐渐减小。最佳工艺参数为焊接温度1180℃,保温60 min,接头平均抗拉强度为1033 MPa,达到母材性能的96.5%,且断裂于母材,满足工程背景需求,并为GH5188 TLP扩散焊的广泛应用提供参考。

关键词： GH5188合金 TLP 焊接工艺微观组织机械性能

Multi-channel laser interferometer based on automatic frequency stabilization system for improving coordinate measurement accuracy

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Optoelectronics Letters 2022年第10期18卷 588-594页

作者： PANG Chengkai ZHANG Qiongqiong ZHANG Hongqiao huang Haiyan DENG Zejiang WU guang State Key Laboratory of Precision Spectroscopy East China Normal UniversityShanghai200241China Chongqing Key Laboratory of Precision Optics Chongqing Institute of East China Normal UniversityChongqing401120China Collaborative Innovation Center of Extreme Optics Shanxi UniversityTaiyuan030006China

A multi-channel laser interferometer(MCLI)is proposed to improve the coordinate measurement accuracy.A 780 nm external cavity laser is locked on the D2 line of ^(87)Rb atom by polarization spectroscopy,and a high frequency stabilized laser source is obtained with a linewidth of 385.8 k Hz at root mean square(RMS).The interferometers share the stabilized source and individually install on 4 axes of a coordinate measuring *** a result,the measurement uncertainty is reduced from 1.2μm to 0.2μm within the dynamic measurement range of 1.0 *** MCLI is adept at integrate and flexible installation,which caters to various applications on precision measurement.

关键词： interferometer channel polarization

Remnants of the amalgamation of the east and west Cathaysia blocks revealed by a short-period dense nodal array

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Geoscience Frontiers 2023年第1期14卷 207-214页

作者： He huang xuzhang Shen Jian xu Rui Gao Wentian Wang Qiming Zhou Qiangqiang huang guangdong Provincial Key Laboratory of Geodynamics and Geohazards School of Earth Sciences and EngineeringSun Yat-Sen UniversityGuangzhou 510275China Southern Marine Science and Engineering guangdong Laboratory(Zhuhai) Zhuhai 519082China

The Cathaysia block located at the southeast South China block(SCB)is considered formed by the amalgamation of the east and west Cathaysia blocks along the Gaoyao-Huilai and Zhenghe-Dapu deep faults(here referred as GHF and ZDF,respectively).Although the extension of the ZDF to the northeast,which represents the amalgamation of the two sub-blocks has been confirmed,the development of the GHF to the southwest remains to be *** better constrain the detailed deep structure beneath the southwest Cathaysia,which hold great significance for revealing the evolution of the SCB,a linear seismic array with 331 nodal geophones was deployed across the Sanshui basin(SSB).Combining with the regional 10 permanent stations(PA),we obtained two profiles with teleseismic P-wave receiver function *** most obvious feature in our results is the ascending Moho towards the coastal area,which is consistent with the passive margin continental and extensional tectonic *** stacking profile from the dense nodal array(DNA)shows that the Moho is offset beneath the transition zone of the Nanling orogeny and *** deduce that this offset may be casued by the deep extension of the GHF,which represents the remnants of the amalgamation of the Cathaysia *** the other evidences,we infer that the widespread and early erupted felsic magmas in the SSB may have resulted from lithospheric materials that were squeezed out to the *** relative higher Bouguer gravity and heat flow support the consolidation of magmas and the residual warm state in the shallow crustal scale beneath the *** sporadic basaltic magmas in the middle SSB may have a close relation to deep extension of the GHF,which serves as a channel for upwelling hot materials.

关键词： Dense short-period nodal array Teleseismic receiver function Cathaysia block Offset Moho High V_(p)/V_(s)ratio

A Review of Terahertz Solid-state Electronic/Optoelectronic Devices and Communication Systems

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Chinese Journal of Electronics 2024年

作者： Wenbo LI Hongxin ZENG Lin huang Sen GONG Haoyi CAO Weipeng WANG Zheng WANG Hongji ZHOU Shixiong LIANG Ziqiang YANG Yaxin ZHANG University of Electronic Science and Technology of China Huzhou Key Laboratory of Terahertz Integrated Circuits and Systems Yangtze Delta Region Institute (Huzhou)University of Electronic Science and Technology of China Terahertz Institute Zhangjiang National Laboratory National Key Laboratory of Application Specific Integrated Circuit Hebei Semiconductor Research Institute

With the rapid development of modern communication technology, spectrum resources have become non-renewable and precious resources, and the terahertz frequency band has entered people's vision. Nowadays, terahertz communication technology has become one of the core technologies for future high-capacity and high-rate communication. This paper discusses and analyzes the core technologies related to the field of terahertz *** introduce the characteristics, domestic and international comparisons and development trends of the core devices for terahertz communication, and also introduce and discuss the terahertz solid-state frequency mixing communication system, terahertz direct modulation communication system, and terahertz optoelectronic communication ***, we summarize the development of terahertz communication technology and the outlook of future applications.

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Versatile and efficient mammalian genome editing with Type I-C CRISPR System of Desulfovibrio vulgaris

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Science China Life Sciences 2024年

作者： Pan Li Dingcai Dong Fei Gao Yuyang Xie Honglin huang Siwei Sun Zhao Ma Cheng He Jinsheng Lai xuguang Du Sen Wu State Key Laboratory of Animal Biotech Breeding College of Biological SciencesNational Engineering Laboratory for Animal BreedingFrontiers Science Center for Molecular Design BreedingChina Agricultural University College of Veterinary Medicine China Agricultural University Sanya Institute of China Agricultural University State Key Laboratory of Maize Bio-breeding National Maize Improvement CenterDepartment of Plant Genetics and BreedingChina Agricultural University Frontiers Science Center for Molecular Design Breeding China Agricultural University Center for Crop Functional Genomics and Molecular Breeding China Agricultural University

CRISPR-Cas tools for mammalian genome editing typically rely on single Cas9 or Cas12a *** type I CRISPR systems in Class I may offer greater specificity and versatility,they are not well-developed for genome ***,we present an alternative type I-C CRISPR system from Desulfovibrio vulgaris (Dvu) for efficient and precise genome editing in mammalian cells and *** optimized the Dvu type I-C editing complex to generate precise deletions at multiple loci in various cell lines and pig primary fibroblast cells using a paired PAM-in crRNA *** edited pig cells can serve as donors for generating transgenic cloned *** Dvu type I-C editor also enabled precise large fragment replacements with homology-directed ***,we adapted the Dvu-Cascade effector for cytosine and adenine base editing,developing Dvu-CBE and Dvu-ABE *** systems efficiently induced C-to-T and A-to-G substitutions in human genes without double-strand ***-target analysis confirmed the high specificity of the Dvu type I-C *** findings demonstrate the Dvu type I-C editor′s potential for diverse mammalian genome editing applications,including deletions,fragment replacement,and base editing,with high efficiency and specificity for biomedicine and agriculture.

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人机信任校准的双途径:信任抑制与信任提升

心理科学进展 2024年第3期32卷 527-542页

作者：黄心语李晔华中师范大学心理学院暨青少年网络心理与行为教育部重点实验室武汉430079

信任是人机成功合作的基础。但个体在人机交互中并不总是持有恰当的信任水平,也可能会出现信任偏差:过度信任和信任不足。信任偏差会妨碍人机合作,因此需要对信任进行校准。信任校准常常通过信任抑制与信任提升两条途径来实现。信任抑... 详细信息

信任是人机成功合作的基础。但个体在人机交互中并不总是持有恰当的信任水平,也可能会出现信任偏差:过度信任和信任不足。信任偏差会妨碍人机合作,因此需要对信任进行校准。信任校准常常通过信任抑制与信任提升两条途径来实现。信任抑制聚焦于如何降低个体对机器人过高的信任水平,信任提升则侧重于如何提高个体对机器人较低的信任水平。未来研究可进一步优化校准效果评估的测量方法、揭示信任校准过程中以及信任校准后个体的认知变化机制、探索信任校准的边界条件以及个性化和精细化的信任校准策略,以期助推人机协作。

关键词：信任校准信任偏差信任抑制信任提升人机交互

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激光冲击强化9Cr18钢及协同制备表面微坑研究

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表面技术 2024年第11期53卷 193-204页

作者：陈秀玉林郁茹李科林陈俊英蒋清山方芳许志龙黄国钦集美大学海洋装备与机械工程学院福建厦门361000 华侨大学福建厦门361000

目的探索9Cr18钢经激光冲击强化后,二次激光冲击制备表面微坑的可行性和相关工艺。方法利用不同工艺参数对9Cr18钢试样进行单点冲击,使用激光共聚焦对单点冲击诱导的微坑进行轮廓形貌检测,使用显微硬度仪测量微坑区域的硬度;通过激光冲... 详细信息

目的探索9Cr18钢经激光冲击强化后,二次激光冲击制备表面微坑的可行性和相关工艺。方法利用不同工艺参数对9Cr18钢试样进行单点冲击,使用激光共聚焦对单点冲击诱导的微坑进行轮廓形貌检测,使用显微硬度仪测量微坑区域的硬度;通过激光冲击对9Cr18钢进行全覆盖表面强化,并进行二次激光冲击,以制备表面微坑。结果对于单点冲击,表面凹坑深度随着激光冲击能量的增大而增大,并非呈线性增大。当冲击能量为12 J时,凹坑深度达到38.39μm。对于同能量单点双次冲击,其凹坑深度比单点冲击大。当冲击能量为12 J时,双次冲击深度最大达到49.05μm。在能量梯度叠加冲击时,以6 J为第1次冲击能量,将第2次冲击能量提高到12 J,此时凹坑深度达到58.61μm。对于不同脉宽冲击,在脉宽为26 ns时,不同能量冲击的凹坑深度均达到最深。经激光冲击强化后,采用不同能量进行二次冲击,在能量为12 J时凹坑深度为19.79μm。采用不同脉宽进行二次冲击,在脉宽为22、26 ns时,凹坑深度为13.61μm。结论表面微坑的深度随着能量、脉冲宽度和冲击次数的增加而增加;表面微坑的硬度随着能量和次数的增加而增大,硬度随着脉宽的增加呈先减小后增大的趋势;采用激光冲击工艺协同处理,可以强化9Cr18钢表面,并制备出一定深度的微坑,可为激光冲击对9Cr18钢的强化及表面织构化提供理论指导和工艺基础。

关键词： 9Cr18钢激光诱导表面织构表面形貌激光参数

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