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新兴污染物对抗生素抗性基因水平转移的影响

生态毒理学报 2024年第4期19卷 71-87页

作者：杨会崔鹏飞汝少国中国海洋大学海洋生命学院青岛266003

抗生素抗性基因(antibiotic resistance genes,ARGs)引起的抗生素耐药性问题被列为新兴环境污染问题,对生态环境和人类健康构成严重威胁。当前备受关注的环境新兴污染物(如内分泌干扰物、重金属、微塑料、纳米塑料等)都可以通过水平基... 详细信息

抗生素抗性基因(antibiotic resistance genes,ARGs)引起的抗生素耐药性问题被列为新兴环境污染问题,对生态环境和人类健康构成严重威胁。当前备受关注的环境新兴污染物(如内分泌干扰物、重金属、微塑料、纳米塑料等)都可以通过水平基因转移单独或协同促进ARGs在环境中的传播、转移和扩散。新兴污染物如何影响ARGs的水平转移过程已成为备受关注的研究热点。本文全面综述了ARGs的来源及水平基因转移的3种经典方式(接合、自然转化和转导),总结了新兴污染物影响ARGs水平转移的规律及潜在机制,以充分认识ARGs在生态系统中的传播动态与最终命运,有助于全面了解新兴污染物在ARGs传播中的作用。最后提出了目前ARGs水平转移的阻断措施和研究的局限性,并为未来研究提出了相关建议,以便制定有效策略防控并阻断ARGs在环境中的传播过程。

关键词：抗生素抗性基因水平基因转移转移机制新兴污染物

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瓦斯钻孔负压通风除尘系统应用

机械管理开发 2024年第4期39卷 166-168页

作者：崔鹏飞晋能控股煤业集团白洞矿业大同有限公司山西大同037001

基于煤矿瓦斯抽采钻孔施工过程中采用传统气水射流除尘装置对钻孔施工产生的煤层进行降尘处理时,水资源浪费大、除尘效果差以及安全系数低等问题,白洞矿服务二队通过技术研究,设计了一套瓦斯钻孔负压通风除尘系统,该系统主要由孔口集尘... 详细信息

基于煤矿瓦斯抽采钻孔施工过程中采用传统气水射流除尘装置对钻孔施工产生的煤层进行降尘处理时,水资源浪费大、除尘效果差以及安全系数低等问题,白洞矿服务二队通过技术研究,设计了一套瓦斯钻孔负压通风除尘系统,该系统主要由孔口集尘器、除尘器、除尘布袋及配套设备等部分组成.通过现场实际应用效果来看,该除尘系统投入使用后钻孔除尘率提高至96%,钻孔成孔率提高至88%以上,取得了显著应用成效.

关键词：瓦斯抽采钻孔除尘系统结构原理

Geometry independent C^(*)-T_(z) dominance of three-dimensional quasistatic growing crack-tip fields in creeping solids

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Science China(Physics,Mechanics & Astronomy) 2022年第1期65卷 22-32页

作者： pengfei cui WanLin Guo State Key Laboratory of Mechanics and Control of Mechanical Structures Nanjing University of Aeronautics and AstronauticsNanjing 210016China

In creeping solids,plane stress and plane strain solutions for asymptotic singular crack-tip fields have been first put forward by Riedel and Rice with C^(*)as the dominating parameter and developed by Xiang and Guo into three-dimensional solution(3D)for stationary cracks under the domination of C^(*)with the constraint factor ***,how to characterize the 3D crack-tip fields under creep damage-induced quasistatic growing conditions remains *** this study,we reveal that,for 3D quasistatic growing cracks,the leading singular solution can effectively characterize the crack-tip stress distributions with relative errors less than 10.8%for relative creep time up to 0.8 in various specimens with finite *** a given relative time,Tz distributions can be unified by the equivalent thickness concept,*** results show that C^(*)-T_(z) can effectively quantify both the load and constraint effects on the crack-tip *** geometry independent dominance can considerably simplify the treatments of load and constraint effects,thereby promoting the application of fracture mechanics in high-temperature damage tolerance designs.

关键词： quasistatic growing crack-tip fields C^(*)-T_(z)solution geometry independence constraints creep damage

From Prediction to Realization:Synthesis and X-Ray Characterization of 15-and 16-Vertex closo-Carboranes

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Chemical Research in Chinese Universities 2021年第1期37卷 183-184页

作者： cui pengfei JIN Guoxin Department of Chemistry Fudan UniversityShanghai200433P.R.China

In order to solve the problem of the synthesis and structural characterization of 15-and 16-vertex closo-carboranes,Xie et *** the method of using silyl groups to both cage carbons,stabilizing the corresponding nido-carborane dianions and promoting the capitation reaction with HBBr2·*** work demonstrates the exist of carboranes with more than 14 vertices and may open the door for further studying supercarborane chemistry.

关键词： chemistry. borane vertex

关节置换与闭合复位内固定治疗合并骨质疏松不稳定型转子间骨折的对比

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中国组织工程研究 2024年第12期28卷 1869-1874页

作者：朱睿智曲强崔鹏飞刘栋张永涛王昌耀青岛大学医学部山东省青岛市266071 青岛大学附属医院山东省青岛市266071

背景:稳定型转子间骨折可以通过闭合复位内固定得到很好的修复效果,但对于合并骨质疏松的不稳定型转子间骨折,目前没有具有绝对优势的手术方式。目的:通过对比闭合复位内固定与关节置换的相关指标,探究关节置换治疗合并骨质疏松老年不... 详细信息

背景:稳定型转子间骨折可以通过闭合复位内固定得到很好的修复效果,但对于合并骨质疏松的不稳定型转子间骨折,目前没有具有绝对优势的手术方式。目的:通过对比闭合复位内固定与关节置换的相关指标,探究关节置换治疗合并骨质疏松老年不稳定型转子间骨折的疗效。方法:回顾性分析2017年1月至2020年1月在青岛大学附属医院接受治疗的102例老年不稳定型股骨转子间骨折患者的临床资料。根据手术方式将患者分为2组,Gamma3组62例,采用Gamma3内固定系统治疗;关节置换组40例,采用人工股骨头置换或全髋关节置换治疗。对两组患者的手术信息、住院情况、髋关节功能以及术后并发症等方面进行比较。结果与结论:①Gamma3组和关节置换组在负重时间(P<0.001)、住院时间(P<0.05)、术中出血量(P<0.001),手术时长(P<0.001)方面相比差异有显著性意义,关节置换组平均负重时间和住院时间均比闭合复位内固定的Gamma3组短;Gamma3组术中出血量和手术时长均优于关节置换组;②两组患者在术后12个月髋关节Harris评分、分项百分制髋评分以及术后并发症方面相比差异均无显著性意义(P=0.526,0.788,0.228);③提示关节置换在治疗合并骨质疏松的老年不稳定型转子间骨折中取得了较好的疗效,能使患者实现早期负重和功能锻炼;谨慎选择适合的患者和假体类型进行关节置换会使患者获得更大的收益。

关键词：股骨转子间骨折不稳定型关节置换骨质疏松闭合复位内固定

拉伸应变下SiC/SiO_(2)近界面碳缺陷的结构和电学特性演变

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固体电子学研究与进展 2024年第3期44卷 206-212页

作者：马玉洁刘涵张圆崔鹏飞苏艳王德君大连理工大学控制科学与工程学院辽宁大连116024 大连理工大学物理学院辽宁大连116024

SiC/SiO_(2)界面拉伸应变对SiC MOSFET器件的电学性质和可靠性变化有重要影响。通过第一性原理密度泛函计算,建立了4H-SiC/SiO_(2)的界面结构,研究了不同拉伸应变对近界面碳碳双键(C=C)和碳氧双键(C=O)缺陷的结构和电子特性的影响。计... 详细信息

SiC/SiO_(2)界面拉伸应变对SiC MOSFET器件的电学性质和可靠性变化有重要影响。通过第一性原理密度泛函计算,建立了4H-SiC/SiO_(2)的界面结构,研究了不同拉伸应变对近界面碳碳双键(C=C)和碳氧双键(C=O)缺陷的结构和电子特性的影响。计算结果表明,在较小应变下C=C和C=O缺陷模型所受应力随应变线性增加,缺陷形成能减小,说明此时拉伸应变使这两种缺陷更容易形成。应变超过20%后,两种缺陷结构附近出现电子离域化,部分化学键断裂,缺陷结构遭到破坏。根据电荷态密度计算得出,拉伸应变的增加会使界面结构的带隙减小及缺陷能级位置改变,从而引起阈值电压漂移,这是拉伸应变引起SiC MOSFET性能不稳定的主要原因。

关键词：碳化硅近界面缺陷拉伸应变态密度第一性原理

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基于元学习聚合分类器的流程工业故障诊断

制造技术与机床 2024年第5期 27-34页

作者：崔鹏飞亚森江·加入拉许晨星史宗帅新疆大学机械工程学院新疆乌鲁木齐830017

针对基于多元统计分析和深度学习的故障诊断方法需要大量的训练样本,但当前流程工业具有故障样本不足等特点,文章提出了一种模型无关的聚合分类器元学习框架(MAACML)。首先,该框架将模型无关的元学习与卷积神经网络相结合并引入一种聚... 详细信息

针对基于多元统计分析和深度学习的故障诊断方法需要大量的训练样本,但当前流程工业具有故障样本不足等特点,文章提出了一种模型无关的聚合分类器元学习框架(MAACML)。首先,该框架将模型无关的元学习与卷积神经网络相结合并引入一种聚合分类器来提高模型的分类准确率和泛化能力;然后,对田纳西伊士曼仿真数据集进行仿真实验验证模型的性能;最终,为了验证模型在实际数据集上的效果,在实际压缩机组数据集进行验证。研究结果表明:MAACML框架具有较高的平均准确率优于其他方法,且具有良好的泛化能力;并且引入的聚合分类器模块对分类结果有明显提升作用;在实际数据集上的分类准确率达到100%,证明了MACCML框架的实用性和有效性。

关键词：流程工业元学习模型无关的元学习卷积神经网络故障诊断

MSONoC: a non-blocking optical interconnection network for inter cluster communication

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High Technology Letters 2020年第3期26卷 262-269页

作者： Jiang Lin cui pengfei Shan Rui Wu Haoyue Integrated Circuit Laboratory Xi'an University of Science and TechnologyXi'an 710054P.R.China School of Electronic and Engineering Xi'an University of Posts and TelecommunicationsXi'an 710121P.R.China

Electric router is widely used for multi-core system to interconnect each other. However, with the increasing number of processor cores, the probability of communication conflict between processor cores increases, and the data delay increases dramatically. With the advent of optical router, the traditional electrical interconnection mode has changed to optical interconnection mode. In the packet switched optical interconnection network, the data communication mechanism consists of 3 processes: link establishment, data transmission and link termination, but the circuit-switched data transmission method greatly limits the utilization of resources. The number of micro-ring resonators in the on-chip large-scale optical interconnect network is an important parameter affecting the insertion loss. The proposed λ-route, GWOR, Crossbar structure has a large overall network insertion loss due to the use of many micro-ring resonators. How to use the least micro-ring resonator to realize non-blocking communication between multiple cores has been a research hotspot. In order to improve bandwidth and reduce access latency, an optical interconnection structure called multilevel switching optical network on chip(MSONoC) is proposed in this paper. The broadband micro-ring resonators(BMRs) are employed to reduce the number of micro-ring resonators(MRs) in the network, and the structure can provide the service of non-blocking point to point communication with the wavelength division multiplexing(WDM) technology. The results show that compared to λ-route, GWOR, Crossbar and the new topology structure, the number of micro-ring resonators of MSONoC are reduced by 95.5%, 95.5%, 87.5%, and 60% respectively. The insertion loss of the minimum link of new topology, mesh and MSONoC structure is 0.73 dB, 0.725 dB and 0.38 dB.

关键词： network on chip(NoC) optical interconnection wavelength division multiplexing(WDM) non-blocking multilevel switching

Symplectic Analysis on Coupling Behaviors of Spatial Fiexible Damping Beam

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Acta Mechanica Solida Sinica 2022年第4期35卷 541-551页

作者： Weipeng Hu Xiaojian Xi Zhe Zhai pengfei cui Fan Zhang Zichen Deng School of Civil Engineering and Architecture Xi’an University of TechnologyXi’an710048China State Key Laboratory of Eco-Hydraulics in Northwest Arid Region of China Xi’an University of TechnologyXi’an710048China China Academy of Ordnance Science Beijing100089China School of Mechanics Civil Engineering and ArchitectureNorthwestern Polytechnical UniversityXi’an710072China

Although the complex structure-preserving method presented in our previous studies can be used to investigate the orbit–attitude–vibration coupled dynamic behaviors of the spatial flexible damping beam,the simulation speed still needs to be *** this paper,the infinite-dimensional dynamic model describing the orbit–attitude–vibration coupled dynamic problem of the spatial flexible damping beam is pretreated by the method of separation of variables,and the second-level fourth-order symplectic Runge–Kutta scheme is constructed to investigate the coupling dynamic behaviors of the spatial flexible damping beam *** with the simulation speed of the complex structure-preserving method,the simulation speed of the symplectic Runge–Kutta method is faster,which benefits from the pretreatment *** effect of the initial radial velocity on the transverse vibration as well as on the attitude evolution of the spatial flexible damping beam is presented in the numerical *** the numerical results about the effect of the initial radial velocity,it can be found that the appearance of the initial radial velocity can decrease the vibration frequency of the spatial beam and shorten the evolution interval for the attitude angle to tend towards a stable value *** addition,the validity of the numerical results reported in this paper is verified by comparing with some numerical results presented in our previous studies.

关键词： Symplectic Runge-Kutta method Spatial fexible damping beam Orbit-attitudevibration coupled dynamic behavior Structure-preserving