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β型钛合金细化α析出相的方法及研究现状

热加工工艺 2020年第14期49卷 1-5页

作者：盖晋阳程军于振涛余森牛金龙刘印曾德鹏东北大学材料科学与工程学院辽宁沈阳110819 西北有色金属研究院陕西省医用金属材料重点实验室陕西西安710016 西北工业大学凝固技术国家重点实验室陕西西安710072

型钛合金在时效过程中,α析出相的含量、形貌和尺寸对合金的综合力学性能影响较大。通过细化α析出相来提高β型钛合金的强度具有重要理论指导意义和工程应用价值。综述了通过改变α相形核和生长方式,以获得细小弥散和均匀分布的α析出... 详细信息

型钛合金在时效过程中,α析出相的含量、形貌和尺寸对合金的综合力学性能影响较大。通过细化α析出相来提高β型钛合金的强度具有重要理论指导意义和工程应用价值。综述了通过改变α相形核和生长方式,以获得细小弥散和均匀分布的α析出相的最新研究进展,对相应机理进行了阐述;并结合细化α相与细化β晶粒,对提高β型钛合金综合力学性能方面进行了展望。

关键词：钛合金 α析出相细化强化

产超广谱β-内酰胺酶大肠埃希菌的耐药机制研究

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检验医学与临床 2016年第12期13卷 1638-1640页

作者：韩松涛曾德鹏徐梅谭玉洁贵州医科大学附属白云医院检验科贵阳550014 贵州医科大学附属医院中心实验室贵阳550001

目的了解贵阳地区医院内检出的大肠埃希菌产超广谱β-内酰胺酶（ESBLs）菌株的耐药性及基因型,为指导临床合理用药提供依据。方法由贵州医科大学附属白云医院ATB系统完成菌株鉴定及药敏试验检测,采用纸片扩散法进行ESBLs表型确证试验,... 详细信息

目的了解贵阳地区医院内检出的大肠埃希菌产超广谱β-内酰胺酶（ESBLs）菌株的耐药性及基因型,为指导临床合理用药提供依据。方法由贵州医科大学附属白云医院ATB系统完成菌株鉴定及药敏试验检测,采用纸片扩散法进行ESBLs表型确证试验,采用碱裂解法提取产ESBLs菌的质粒DNA,采用聚合酶链反应扩增TEM型、SHV型、CTX-M-1组和CTX-M-9组基因。结果产ESBLs大肠埃希菌阳性率为66.7%（279/418）;对阿米卡星耐药率为4.3%;对青霉素类,头孢菌素第1、2代药物耐药率均为100.0%;庆大霉素、妥布霉素、喹诺酮类、磺胺类药物耐药率在60.6%～84.9%;对亚胺培南和美罗培南仍保持较高的敏感度。116株产ESBLs大肠埃希菌基因型有113株（97.4%）为CTX-M型,其中CTX-M-9亚型68株（58.6%）,CTX-M-1亚型67株（57.8%）;TEM型有86株（74.1%）;未检出SHV型。结论产ESBLs阳性的大肠埃希菌的耐药率明显高于产ESBLs阴性的大肠埃希菌,且具有多重耐药性。贵州医科大学附属白云医院产ESBLs大肠埃希菌的基因型以CTX-M型为主;碳青霉烯类为最敏感的药物,但本研究中发现亚胺培南耐药菌株,需引起临床重视。

关键词：大肠埃希菌超广谱β-内酰胺酶耐药性基因型

Compressed SNR-and-Channel Estimation for Beam Tracking in 60-GHz WLAN

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China Communications 2015年第6期12卷 46-58页

作者： GAO Bo ZHANG Changming JIN depeng zeng Lieguang State Key Laboratory on Microwave and Digital Communications Department of Electronic Engineering Tsinghua University

Signal-to-noise ratio （SNR） and channel estimations are critical for 60-GHz communications to track the optimal trans- mission and reception beam pairs. However, the excessive pilot overhead for the estima- tions severely reduces system throughput in fast-rotation scenarios. In order to address this problem, we firstly demonstrate the potential sparseness property of 60-GHz channel in beam tracking; subsequently, via exploiting this property, we propose a novel compressed SNR-and-channel estimation. The estimation is conducted in a three-stage fashion, includ- ing the unstructured estimation, nonzero-tap detection, and structured estimation with non- zero-tap location. Numerical simulations show that, in the case of substantial reduction of the pilot overhead, the proposed estimator still reveals a significant improvement in terms of estimation performance over the scheme in IEEE 802.1 lad. Furthermore, it is also demon- strated that the proposed SNR and channel estimators can approach the lower bounds in sparse channels so long as SNR exceeds 8 dB.

关键词： 60-GHz communications beamtracking channel estimation SNR estimation sparse channel

Opportunistic spectrum sharing in software defined wireless network

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Journal of Systems Engineering and Electronics 2014年第6期25卷 934-941页

作者： Mao Yang Yong Li depeng Jin Li Su Lieguang zeng Department of Electronic Engineering Tsinghua University

Over the past few decades, the world has witnessed a rapid growth in mobile and wireless networks（MWNs） which significantly change human life. However, proliferating mobile demands lead to several intractable challenges that MWN has to face. Software-defined network is expected as a promising way for future network and has captured growing attention. Network virtualization is an essential feature in software-defined wireless network（SDWN）, and it brings two new entities, physical networks and virtual networks. Accordingly, efficiently assigning spectrum resource to virtual networks is one of the fundamental problems in SDWN. Directly orienting towards the spectrum resource allocation problem, firstly, the fluctuation features of virtual network requirements in SDWN are researched, and the opportunistic spectrum sharing method is introduced to SDWN. Then, the problem is proved as NP-hardness. After that, a dynamic programming and graph theory based spectrum sharing algorithm is *** demonstrate that the opportunistic spectrum sharing method conspicuously improves the system performance up to around 20%–30% in SDWN, and the proposed algorithm achieves more efficient performance.

关键词： software-defined network(SDN) wireless virtualiza-tion opportunistic spectrum sharing dynamic programming graph theory

Hardware/software co-verification platform for EOS design

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High Technology Letters 2005年第3期11卷 294-297页

作者： Wang Peng（王鹏） Jin depeng zeng Lieguang Department of Electronic Engineering Tsinghua University Beijing 100084 P.R. China Information Engineer University Zhengzhou 450002 P.R. China

Ethernet over SDH/SONET (EOS) is a hotspot in today's data transmission technology for it combines the merits of both Ethernet and SDH/SONET. However, implementing an EOS system on a chip is complex and needs full verifications. This paper introduces our design of Hardware/Software co-verification platform for EOS design. The hardware platform contains a microprocessor board and an FPGA (Field Programmable Gate Array)-based verification board, and the corresponding software includes test benches running in FPGAs, controlling programs for the microprocessor and a console program with GUI (Graphical User Interface) interface for configuration, management and supervision. The design is cost-effective and has been successfully employed to verify several IP (Intellectual Property) blocks of our EOS chip. Moreover, it is flexible and can be applied as a general-purpose verification platform.

关键词： Hardware/software co-verification EOS

An integrated self-healing algorithm for resilient packet ring

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High Technology Letters 2005年第3期11卷 284-288页

作者： Zhou Xiaobo（周晓波） Jin depeng zeng Lieguang School of Electronics and Information Engineering Beijing Jiaotong University Department of Electronic Engineering Tsinghua University

Resilient Packet Ring (RPR) is a Media Access Control (MAC) layer protocol that operates over a double counter-rotating ring network topology. RPR is designed to enhance Synchronous Digital Hierarchy(SDH) in order to handle data traffic more efficiently. Since Intelligent Protection Switching(IPS) is one of the key technologies in ring networks, RPR provides two intelligent protection algorithms: steering and wrapping. While wrapping in RPR in essence inherits the automatic protection switching(APS) algorithm of SDH, it also wastes the bandwidth on the wrapping ringlets and may result in severe congestion. Whereas steering in RPR provides high bandwidth utilization, its switching speed is low, because it is indeed a high layer's restoration algorithm. In this paper, integrated self-healing(ISH) algorithm as an effective algorithm for RPR is proposed, which synthesizes the merits of the two algorithms by transporting healing signal and computing routing in MAC layer. At last, the performance of ISH algorithm is analyzed and simulated.

关键词： resilient packet ring (RPR) media access control (MAC) self-healing ring intelligent protection switching (IPS)

Taxonomic and functional variations in the microbial community during the upgrade process of a full-scale landfill leachate treatment plant-from conventional to partial nitrification-denitrification

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Frontiers of Environmental Science & Engineering 2020年第6期14卷 17-28页

作者： Binbin Sheng depeng Wang Xianrong Liu Guangxing Yang Wu zeng Yiqing Yang Fangang Meng School of Environmental Science and Engineering Sun Yat-sen UniversityGuangzhou 510275China Guangdong Provincial Key Laboratory of Environmental Pollution Control and Remediation Technology Sun Yat-sen UniversityGuangzhou 510275China Guangzhou Environmental Protection Investment Group Co. Guangzhou 510330China School of Life Sciences and Biopharmaceutics Guangdong Pharmaceutical UniversityGuangzhou 510006China

Because of the low access to biodegradable organic substances used for denitrification,the partial nitrification-denitrification process has been considered as a low-cost,sustainable alternative for landfill leachate *** this study,the process upgrade from conventional to partial nitrificationdenitrification was comprehensively investigated in a full-scale landfill leachate treatment plant(LLTP).The partial nitrification-denitrification system was successfully achieved through the optimizing dissolved oxygen and the external carbon source,with effluent nitrogen concentrations lower than 150 mg/***,the upgrading process facilitated the enrichment of Nitrosomonas(abundance increased from 0.4%to 3.3%),which was also evidenced by increased abundance of amoA/B/C genes carried by *** Nitrospira(accounting for 0.1%-0.6%)was found to stably exist in the reactor tank,considerable nitrite accumulation occurred in the reactor(reaching 98.8 mg/L),indicating high-efficiency of the partial nitrification ***,the abundance of Thauera,the dominant denitrifying bacteria responsible for nitrite reduction,gradually increased from 0.60%to 5.52%during the upgrade *** process caused great changes in the microbial community,inducing continuous succession of heterotrophic bacteria accompanied by enhanced metabolic potentials toward organic *** results obtained in this study advanced our understanding of the operation of a partial nitrification-denitrification system and provided a technical case for the upgrade of currently existing full-scale LLTPs.

关键词： Landfill leachate Process upgrade Partial nitrification-denitrification Bacterial community Metagenomics

A biosensing system employing nanowell microelectrode arrays to record the intracellular potential of a single cardiomyocyte

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Microsystems & Nanoengineering 2022年第3期8卷 185-198页

作者： Yuting Xiang Haitao Liu Wenjian Yang Zhongyuan xu Yue Wu Zhajian Tang Zhjing Zhu Zhiyong zeng depeng Wang Tianxing Wang Ning Hu Diming Zhang Department of Obstetrics and Gynecology Affiliated Dongguan People's HospitalSouthern Medical UniversityDongguan 523058China Research Center for Inelligent Sensing Systems Zhejiang LaboratoryHangzhou 311100China Research Center for Humanoid Sensing Zhejiang LaboratoryHangzhou 311100China Key Laboratory of Novel Target and Drug Study for Neural Repair of Zhejiang Province School of MedicineSchool of Computer&Computing ScienceZhejiang University City CollegeHangzhou 310015China School of Brain Science and Brain Medicine Zhejiang UniversityHangzhou 310058China School of Automation Nanjing University of Science and TechnologyNanjing 210094China College of Energy and Power Engineering Nanjing University of Aeronautics and AstronauticsNanjing 210016China E-Link Care Meditech Co. LtdHangzhou 310011China ZJU-Hangzhou Global Scientific and Technological Innovation Center Department of ChemitryZhejiang UniversityHangzhou 310058China

Electrophysiological recording is a widely used method to investigate cardiovascular pathology,pharmacology and developmental *** arrays record the electrical potential of cells in a minimally invasive and highthroughput ***,commonly used microelectrode arays primarily employ planar microelectrodes and cannot work in applications that require a recording of the intracellular action potential of a single *** this study,we proposed a novel measuring method that is able to record the intracellular action potential of a single cardiomyocyte by using a nanowell patterned microelectrode array(NWMEA).The NWMEA consists of five nanoscale wells at the center of each circular planar *** pulse electroporation was applied to the NWMEA to penetrate the cardiomyocyte membrane,and the intracellular action potential was continuously *** intracellular potential recording of cardiomyocytes by the NWMEA measured a potential signal with a higher quality(213.76±25.85%),reduced noise root-mean-square(~33%),and higher signal-to-noise ratio(254.36±12.61%)when compared to those of the extracellular *** to previously reported nanopillar microelectrodes,the NWMEA could ensure single cell electroporation and acquire high-quality action potential of cardiomyocytes with reduced fabrication *** NWMEA-based biosensing system is a promising tool to record the intracellular action potential of a single cell to broaden the usage of microelectrode arrays in electrophysiological investigation.

关键词： arrays potential record

Supported Cu/Ni Bimetallic Cluster Electrocatalysts Boost CO_(2) Reduction

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Precision Chemistry 2024年第3期2卷 96-102页

作者： depeng Wang Jiazhi Wang Zhi Wang Ning Zhang Jianrong zeng Haixia Zhong Xinbo Zhang State Key Laboratory of Rare Earth Resource Utilization Changchun Institute of Applied ChemistryChinese Academy of SciencesChangchun 130022China School of Applied Chemistry and Engineering University of Science and Technology of ChinaHefei 230026China

Supported metal clusters with the integrated advantages of single-atom catalysts and conventional nanoparticles held great promise in the electrocatalytic carbon dioxide reduction(ECO_(2)R)operated at low overpotential and high current ***,its precise synthesis and the understanding of synergisti-cally catalytic effects remain ***,we report a facile method to synthesize the bimetallic Cu and Ni clusters anchored on porous carbon(Cu/Ni-NC)and achieve an enhanced ECO_(2)*** aberration-corrected high-angle annular dark-field scanning transmission electron microscopy and synchrotron X-ray absorption spectroscopy were employed to verify the metal dispersion and the coordination of Cu/Ni clusters on *** a result of this route,the target Cu/Ni-NC exhibits excellent electrocatalytic performance including a stable 30 h electrolysis at 200 mA cm^(-2) with carbon monoxide Faradaic efficiency of∼95.1%using a membrane electrode assembly electrolysis *** with the in situ analysis of the surface-enhanced Fourier transform infrared spectroelectrochemistry,we propose that the synergistic effects between Ni and Cu can effectively promote the H_(2)O dissociation,thereby accelerate the hydrogenation of CO_(2)to*COOH and the overall reaction process.

关键词： electrocatalytic CO_(2)reduction bimetallic cluster synergistic catalysis membrane electrode assembly electrolysis cell in situ surface-enhanced infrared absorption spectroscopy