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铁路通信网管云平台建设方案研究

铁路通信信号工程技术 2024年第10期21卷 42-48页

作者：方晓君李征文北京全路通信信号研究设计院集团有限公司北京100070 中国铁路广州局集团有限公司广州510088

传统的铁路通信网络管理架构面临着资源利用率低、扩展性差、可靠性低等挑战。结合工程设计实际,通过分析比较两种云基础设施架构,基于广州局某一通信网管中心既有承载网系统资源情况,提出铁路通信承载网建设网管云平台方案,实现云计算... 详细信息

传统的铁路通信网络管理架构面临着资源利用率低、扩展性差、可靠性低等挑战。结合工程设计实际,通过分析比较两种云基础设施架构,基于广州局某一通信网管中心既有承载网系统资源情况,提出铁路通信承载网建设网管云平台方案,实现云计算、虚拟化技术和铁路通信网络管理的融合应用,以提高网络管理效率、降低运维成本并增强网络的灵活性。

关键词：通信网管云建设方案

Alternating nitrogen feeding strategy induced aerobic granulation:Influencing conditions and mechanism

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Journal of Environmental Sciences 2021年第11期33卷 135-147页

作者： Chunli Wan zhengwen li Yanggui Shen Xiang liu Department of Environmental Science and Engineering Fudan UniversityShanghai 200438China College of Materials Science and Chemical Engineering Harbin Engineering UniversityHarbin 150001China

Effective cultivation of stable aerobic granular sludge(AGS)is a crucial step in the successful application of this technology,and the formation of AGS could be facilitated by some environmental stress *** identical sequencing batch reactors(SBRs)were established to investigate the aerobic granulation process under the same alternating ammonia nitrogen feeding strategy superimposed with different environmental conditions(inorganic carbon source,temperature,N/COD).Although various superimposed conditions induced a significant difference in the size,settling velocity,mechanic strength of AGS,mature aerobic granules could be successfully obtained in all four reactors after 70 days’operation,indicating the alternating ammonia nitrogen feeding strategy was the most critical factor for AGS *** on the results of redundancy analysis,the presence of an inorganic carbon source could facilitate the cultivation of AGS with nitrification function,while the moderate temperature and fluctuant N/COD might benefit the cultivation of more stable *** addition,superimposed stress conditions could result in the difference in the microbial population between four reactors,but the population diversity and abundance of microorganisms were not the determinants of AGS *** study provided an effective method for the cultivation of AGS by using alternating ammonia nitrogen feeding strategy.

关键词： Aerobic granule sludge Granulation Alternating nitrogen feeding Cultivation

Biomimetic Fabrication of Polymer Film with High Adhesive Superhydrophobicity by Duplicating Locust Wing Surface

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Chemical Research in Chinese Universities 2015年第5期31卷 895-898页

作者： SUN Gang FANG Yan ZHI Heng li zhengwen School of life Science Changchun Normal University Changchun 130032 P. R. China School of life Science Northeast Normal University Changchun 130024 P. R. China

Locust is a common flying insect. Locust wings were used as biomimetic templates to fabricate multi-functional polymer（polydimethylsiloxane, PDMS） films by soft lithography. The microstructure and wettability of the natural and artificial locust wing surfaces were investigated by means of a scanning electron microscope（SEM） and a video-based contact angle meter. The natural locust wing surface exhibits complicated hierarchical structures and high adhesive superhydrophobicity（contact angle 152°）. The prepared polymer film faithfully reproduces the surface microstructures of the bio-template, and displays a good hydrophobicity and high adhesion（contact angle 144°）. The complex wettability of the natural and artificial locust wing surfaces ascribes to the cooperative effect of hydrophobic composition and multi-dimensional rough microstructures. This work not only promotes our understanding of the wetting mechanism on bio-surfaces, but offers an inexpensive and effective approach for biomimetic fabrication of multi-functional interfacial materials.

关键词： Biomimetic Superhydrophobicity Adhesion Polymer film Locust wing

加味参芪四物汤对老年不稳定性股骨粗隆间骨折患者(气血亏虚型)IL-6、TNF-α、骨代谢及免疫功能的影响

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全科医学临床与教育 2024年第4期22卷 321-324页

作者：王玲星李正文吕伟胜浙江省永康市中医院骨伤科浙江金华321300

目的探讨加味参芪四物汤在老年不稳定性股骨粗隆间骨折患者(气血亏虚型)血清白介素-6(IL-6)、肿瘤坏死因子-α(TNF-α)、骨代谢及免疫功能的影响。方法选取老年不稳定性股骨粗隆间骨折(气血亏虚型)患者89例,采用随机数字表法分为两组。... 详细信息

目的探讨加味参芪四物汤在老年不稳定性股骨粗隆间骨折患者(气血亏虚型)血清白介素-6(IL-6)、肿瘤坏死因子-α(TNF-α)、骨代谢及免疫功能的影响。方法选取老年不稳定性股骨粗隆间骨折(气血亏虚型)患者89例,采用随机数字表法分为两组。对照组45例采用股骨近端防旋髓内钉(PFNA)内固定术治疗,观察组44例在对照组的基础上联合加味参芪四物汤治疗,治疗2周后比较临床疗效。结果治疗后观察组血清IL-6、TNF-α、D-二聚体(D-D)水平低于对照组,β-内啡肽(β-EP)、血清骨特异性碱性磷酸酶(BALP)、骨钙素(BGP)水平、CD3+、CD4+、CD4+/CD8+高于对照组(t分别=9.19、12.18、12.94、-8.29、7.92、9.35、7.61、9.27、7.90,P均<0.05)。观察组总有效率明显高于对照组(χ^(2)=8.21,P<0.05);并发症总发生率明显低于对照组(χ^(2)=7.35,P<0.05)。结论对于PFNA内固定术联合加味参芪四物汤治疗老年不稳定性股骨粗隆间骨折(气血亏虚型)可有效降低炎症反应和并发症的发生,对骨代谢具有一定的调节作用,还能促进患者术后康复效果,改善预后。

关键词：参芪四物汤不稳定性股骨粗隆间骨折气血亏虚型炎症因子老年人骨代谢免疫功能

In-situ/operando techniques to identify active sites for thermochemical conversion of CO_(2) over heterogeneous catalysts

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Journal of Energy Chemistry 2021年第11期30卷 153-171,I0004页

作者： Kai Feng Yaning Wang Man Guo Jingpeng Zhang zhengwen li Tianyu Deng Zhihe Zhang Binhang Yan Department of Chemical Engineering Tsinghua UniversityBeijing 100084China

The catalytic conversion of CO_(2) to fuels or chemicals is considered to be an effective pathway to mitigate the greenhouse effect. To develop new types of efficient and durable catalysts, it is critical to identify the catalytic active sites, surface intermediates, and reaction mechanisms to reveal the relationship between the active sites and catalytic performance. However, the structure of a heterogeneous catalyst usually dynamically changes during reaction, bringing a great challenge for the identification of catalytic active sites and reaction pathways. Therefore, in-situ/operando techniques have been employed to real-time monitor the dynamic evolution of the structure of active sites under actual reaction conditions to precisely build the structure–function relationship. Here, we review the recent progress in the application of various in-situ/operando techniques in identifying active sites for catalytic conversion of CO_(2) over heterogeneous catalysts. We systematically summarize the applications of various optical and X-ray spectroscopy techniques, including Raman spectroscopy, Fourier transform infrared (FTIR) spectroscopy, X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), and X-ray absorption spectroscopy (XAS), in identifying active sites and determining reaction mechanisms of the CO_(2) thermochemical conversion with hydrogen and light alkanes over heterogeneous catalysts. Finally, we discuss challenges and opportunities for the development of in-situ characterization in the future to further enlarge the capability of these powerful techniques.

关键词： In-situ characterization Spectroscopy techniques Active sites CO_(2)conversion Heterogeneous catalysis

High resolution 3D nonlinear integrated inversion

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Applied Geophysics 2009年第2期6卷 159-165页

作者： li Yong Wang Xuben li Zhirong li Qiong li zhengwen Key Lab of Earth Exploration ＆ Information Technology Chengdu University of Technology Chengdu 610059 China CNPC Chuanqing Drilling Engineering Company Limited Sichuan Geophysical Company Chengdu 610213 China

The high resolution 3D nonlinear integrated inversion method is based on nonlinear theory. Under layer control, the log data from several wells （or all wells） in the study area and seismic trace data adjacent to the wells are input to a network with multiple inputs and outputs and are integratedly trained to obtain an adaptive weight function of the entire study area. Integrated nonlinear mapping relationships are built and updated by the lateral and vertical geologic variations of the reservoirs. Therefore, the inversion process and its inversion results can be constrained and controlled and a stable seismic inversion section with high resolution with velocity inversion, impedance inversion, and density inversion sections, can be gained. Good geologic effects have been obtained in model computation tests and real data processing, which verified that this method has high precision, good practicality, and can be used for quantitative reservoir analysis.

关键词： high resolution integrated inversion network with multiple input and output hybrid intelligent learning algorithm

A DNA tetrahedron-based ferroptosis-suppressing nanoparticle: superior delivery of curcumin and alleviation of diabetic osteoporosis

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Bone Research 2024年第1期12卷 227-239页

作者： Yong li zhengwen Cai Wenjuan Ma Long Bai En Luo Yunfeng lin State Key Laboratory of Oral Diseases&National Center for Stomatology&National Clinical Research Center for Oral Diseases West China Hospital of StomatologySichuan UniversityChengduSichuan 610041PR China Department of Oral and Maxillofacial Surgery Affiliated Stomatological HospitalSouthwest Medical UniversityLuzhouSichuan 646000PR China Sichuan Provincial Engineering Research Center of Oral Biomaterials ChengduSichuan 610041China

Diabetic osteoporosis(DOP)is a significant complication that poses continuous threat to the bone health of patients with diabetes;however,currently,there are no effective treatment *** patients with diabetes,the increased levels of ferroptosis affect the osteogenic commitment and differentiation of bone mesenchymal stem cells(BMSCs),leading to significant skeletal *** address this issue,we aimed to target ferroptosis and propose a novel therapeutic approach for the treatment of *** synthesized ferroptosis-suppressing nanoparticles,which could deliver curcumin,a natural compound,to the bone marrow using tetrahedral framework nucleic acid(tFNA).This delivery system demonstrated excellent curcumin bioavailability and stability,as well as synergistic properties with *** in vitro and in vivo experiments revealed that nanoparticles could enhance mitochondrial function by activating the nuclear factor E2-related factor 2(NRF2)/glutathione peroxidase 4(GPX4)pathway,inhibiting ferroptosis,promoting the osteogenic differentiation of BMSCs in the diabetic microenvironment,reducing trabecular loss,and increasing bone *** findings suggest that curcumin-containing DNA tetrahedron-based ferroptosissuppressing nanoparticles have a promising potential for the treatment of DOP and other ferroptosis-related diseases.

关键词： curcumin osteoporosis diabetic

Cobalt nanoparticles encapsulated in nitrogen-doped carbon for room-temperature selective hydrogenation of nitroarenes

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Chinese Journal of Catalysis 2018年第4期39卷 664-672页

作者： Ruijie Gao Lun Pan zhengwen li Xiangwen Zhang li Wang Ji‐Jun Zou Key Laboratory for Green Chemical Technology of the Ministry of Education School of Chemical Engineering and TechnologyTianjin UniversityTianjin 300072China Collaborative Innovative Center of Chemical Science and Engineering(Tianjin) Tianjin 300072China

Here,we report cobalt nanoparticles encapsulated in nitrogen‐doped carbon(Co@NC)that exhibit excellent catalytic activity and chemoselectivity for room‐temperature hydrogenation of ***@NC was synthesized by pyrolyzing a mixture of a cobalt salt,an inexpensive organic molecule,and carbon *** the Co@NC catalyst,a turnover frequency of^12.3 h?1 and selectivity for 4‐aminophenol of>99.9%were achieved for hydrogenation of 4‐nitrophenol at room temperature and 10 bar H2 *** excellent catalytic performance can be attributed to the cooperative effect of hydrogen activation by electron‐deficient Co nanoparticles and energetically preferred adsorption of the nitro group of nitroarenes to electron‐rich N‐doped *** addition,there is electron transfer from the Co nanoparticles to N‐doped carbon,which further enhances the functionality of the metal center and carbon *** catalyst also exhibits stable recycling performance and high activity for nitroaromatics with various substituents.

关键词： Cobalt nanoparticle Nitrogen‐doped carbon Nitroarenes Selective hydrogenation Hydrogen activation Heterogeneous catalysis

The nature of electron density enhancement over a wide altitude range during ionosphere heating experiments at EISCAT

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Earth and Planetary Physics 2024年第2期8卷 408-414页

作者： Jun Wu Jian Wu Jie Feng Qingliang li ShuJi Hao zhengwen Xu HaiSheng Zhao YaBin Zhang National Key Laboratory of Electromagnetic Environment China Research Institute of Radio Wave PropagationBeijing 102206China School of Physics Xidian UniversityXi’an 710071China

During the course of ionospheric heating experiments, researchers at the European Incoherent Scatter Scientific Association (EISCAT) observed an apparent electron density enhancement. The enhancement extended over a wide range of altitudes, above the reflection altitude of the high-frequency pump wave. However, whether this enhancement actually corresponds to a true enhancement in electron density remains an open question. When the dispersion relation of ion acoustic waves is followed, the frequency ratio of the enhanced ion line to the background ion line suggests that the profile of the effective ion mass may have remained unchanged. Furthermore, the solar radio flux and ion drift velocity indicate no significant changes in the ion species and their densities. In conclusion, the electron density enhancement observed at EISCAT should not, in fact, be considered a true enhancement.

关键词： incoherent scatter radar(ISR) ionospheric heating electron density ion acoustic wave