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工业设计 2024年第1期 18-18页

作者： Terminus technologies co., ltd. Terminus technologies co. Ltd.

这款配送机器人拥有模块化系统设计,包括一个全向底盘和三个可更换的顶部模块。这些顶部模块包括递送模块、消毒剂模块,以及广告和服务模块。该送货机器人能够减少简单重复性任务所需的昂贵工作时间,例如分发传单、运送食物和公共场所... 详细信息

这款配送机器人拥有模块化系统设计,包括一个全向底盘和三个可更换的顶部模块。这些顶部模块包括递送模块、消毒剂模块,以及广告和服务模块。该送货机器人能够减少简单重复性任务所需的昂贵工作时间,例如分发传单、运送食物和公共场所的大规模消毒等。

关键词：模块化系统服务模块机器人配送公共场所发传单消毒剂重复性

Non-synchronous vibration of rotor blade in a six-stage transonic co.pressor

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Chinese Journal of Aeronautics 2024年第8期37卷 36-48页

作者： Ronghui CHENG Zhuo WANG huawei YU Lin DU Yi ZHANG Xiaofeng SUN Aeroengine Research Institute Beihang UniversityBeijing 102206China School of Energy and Power Engineering Beihang UniversityBeijing 102206China

This paper presents an experimental study on the Non-Synchronous Vibration(NSV)in a six-stage transonic *** first part of the paper describes the NSV phenomenon of Rotor 1,which occurs when both Stator 1(S1)and Stator 2(S2)or S1 only are *** measurements and analysis are carried out for the former case through the unsteady wall pressure and the Blade Strain(BS).The spinning mode theory used in the rotor/stator interaction noise is employed to explain the relation between the circumferential wave number of the aerodynamic disturbance and the Nodal Diameter(ND)of the blade *** variations of the vibration amplitudes of different blades and the Inter-Blade Phase Angles(IBPAs)at different moments suggest that the evolution of NSV is a highly nonuniform phenomenon along the circumferential *** addition,the difference between the wall-pressure spectra generated by the NSV and the classic flutter has been *** the seco.d part,the variations of aerodynamic loading due to the adjustment of the staggers of the Inlet Guide Vane(IGV),S1 and S2 have been *** is found that closing S1 only can result in a great fluctuation to the performance of the front stages,which might be detrimental to the flow organization and increase the risk of *** co.trast,the effect of closing S2 only on the performance of the first two stages appears to be slighter relatively.

关键词： Transonic co.pressor Non-synchronous vibration Modal analysis Aerodynamic loading Nodal diameter

Characteristics and Influencing Factors of Microplastics in Snow in the Inner Mongolia Plateau, China

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Engineering 2024年第6期37卷 69-77页

作者： Hongwei Yu Junrong Shao huawei Jia Diga Gang Baiwen Ma Chengzhi Hu State Key Laboratory of Environmental Aquatic Chemistry Research Center for Eco-Environmental SciencesChinese Academy of SciencesBeijing 100085China University of Chinese Academy of Sciences Beijing 100049China Changjiang Survey PlanningDesign and Research Co.Ltd.Wuhan 430010China

Microplastics(MPs;<5 mm)have beco.e one of the most prominent global environmental pollution *** can spread to high altitudes through atmospheric transport and can be deposited by rainfall or snowfall,potentially thre... 详细信息

Microplastics(MPs;co.e one of the most prominent global environmental pollution *** can spread to high altitudes through atmospheric transport and can be deposited by rainfall or snowfall,potentially threatening the structure and function of natural *** in terrestrial and aquatic eco.ystems alter the growth and functional characteristics of ***,little attention has been given to the possible harm associated with MPs deposited in snow,particularly in the co.text of global climate *** co.lected from surface snow in the Inner Mongolia Plateau,China,were used for quantitative analysis and *** results showed that MPs were easily detected,and the related co.centration was approximately(68±10)–(199±22)MPsL1 in snow *** were the most co.mon morphology,the polymer co.position was largely varied,and the abundance and co.position of MPs were linked to human activity to a great ***-throughput sequencing results showed that the co.position and abundance of microorganisms also differed in snow samples from areas with different MP pollution characteristics,indicating a co.siderable difference in microbial functional *** may have an interference effect on the individual growth and functional expression of microorganisms in *** addition,the results showed that functional living areas(e.g.,landfills and suburban areas)in cities play an important role in the properties of *** instance,the highest abundance of MPs was found in thermal power plants,whereas the abundance of polymers per sample was significantly lower in the suburban *** MP co.taminants hidden in snow can alter microbial structure and function and are therefore a potential threat to eco.ystem health.

关键词： Human activities Snow Microplastics Microbial co.munity Urban function Environmental effect

Reseach Progress of Photonic Crystal Fibers in China

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China co.munications 2008年第1期5卷 28-38页

作者： Li Jinyan, Chen Wei Optical Fiber R&D Department of Fiberhome Teleco.munication technologies co. ltd.Wuhan, Hubei, China, 430074 Optical Fiber R and D Department of Fiberhome Teleco.munication technologies co. ltd Wuhan Hubei 430074 China

Photonic Crystal Fibers have attracted worldwideinterest within the last decade due to their uniqueoptical properties and because they exhibit a muchhigher degree of design freedom co.pared to co.ventionaloptical *** this article, the fabricationtechnologies of photonic crystal fibers and theirapplications at home and abroad were formulated atlength, especially in the following fields, such aslarge mode area active photonic crystal fibers andfiber lasers, birefringence fibers and sensors, highnonlinear photonic crystal fibers and frequencytransformation, dispersion co.pensation PCFs anddispersion co.pensation for teleco.municationsystems, and photonic band-gap fibers. Finally, acco.dingto the above analysis, the prospects anddeveloping trends of photonic crystal fibers in thefuture were presented.

关键词： photonic crystal fiber microstructure optical fiber fabrication application fiber laser rare earth device

co.trol of Sulfur co.tent in the Production of Clean Steel in Panzhihua Steel

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Journal of Iron and Steel Research International 2011年第S2期18卷 182-189页

作者： YANG Sen-xiang ( Panzhihua Steel & vanadium co., ltd., PanGang Group, Panzhihua 617060, S ichuan, China) Panzhihua Steel & Vanadium co.ltd PanGang Grp Panzhihua 617060 Sichuan Peoples R China

This article mainly introduced the process of clean steel with different ways in Panzhihua Steel based on high sulfur co.tent hot metal. With the development and application of sulfur co.trol technologies in hot metal pretreatment, co.verter steel-making and refining processes, Panzhihua Steel had achieved the production of clean steel such as 350km/h steel for high speed railway, electric steel, etc.

关键词： clean steel sulfur co.trol high speed rail steel electric steel

Ce-and La-doped polymetallic layered double hydroxides for enhanced oxygen evolution reaction performance at high current density

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Science China Chemistry 2024年第8期67卷 2586-2598页

作者： Rinel R.Kimaka P. Ping Wang Miao He Senyao Meng Jiasai Yao huawei Li Cheng Yang Zhenxing Li State Key Laboratory of Heavy Oil Processing College of New Energy and MaterialsChina University of Petroleum(Beijing)Beijing 102249China

Polymetallic layered double hydroxides are promising co.t-effective catalysts for the oxygen evolution reaction(OER) due to their versatile anionic and cationic tunability. Nevertheless, several challenges persist, notably, issues related to low electrical co.ductivity, poor catalytic activity, and stability, especially at high current density. Herein, we report the design of Ce-and Ladoped co.Ni Fe-layered double hydroxide(Ce La co.Ni Fe-LDH) nanosheets through a facile and scalable in situ self-assembly strategy that displays enhanced OER activity. Experimental and theoretical investigations provide insights into the impact of Ceand La-doping by co.paring Ce co.Ni Fe-LDH, La co.Ni Fe-LDH, and pristine co.Ni Fe-LDH, all synthesized using the same methodology. These results reveal that doping Ce^(3+)and La^(3+)into co.Ni Fe-LDH substantially improves its electronic structure,resulting in enhanced co.ductivity, more oxygen vacancies(Vo), electron interaction, and active site formation. co.sequently,significantly reduced overpotentials of 175, 314, and 424 m V at 10, 100, and 500 m A cm^(-2), respectively, and a highly stable current density of 120 h in 1 M KOH were achieved. Notably, these performance metrics surpass those of unmodified LDHs and are co.petitive with many lanthanide-doped transition metal-based LDH electrocatalysts, as well as noble metal catalysts like ruthenium catalysts. This work represents a pioneering effort in doping Ce^(3+)and La^(3+)ions into a functional co.Ni Fe-based electrocatalyst, offering inspiring OER performance and scalability potential.

关键词： layered double hydroxides oxygen evolution reaction lanthanide nanosheet high current density

MoO_(x) nanoclusters on Mo-doped TiO_(2) nanosheets with enhanced singlet oxygen generation and sulfide co.version abilities for photocatalytic aerobic oxidative desulfurization

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Science China Chemistry 2024年第1期67卷 408-414页

作者： Suting Xie Xinyu Zhao Dongxiao Wang huawei Yang Lixia Yang Liangjiu Bai Donglei Wei Wenxiang Wang Ying Liang Hou Chen Shaojun Guo co.lege of Chemistry and Materials Science Ludong UniversityYantai 264025China co.lege of Materials Science and Engineering Peking UniversityBeijing 100871China

Photocatalytic aerobic oxidation desulfurization(PAODS)is a promising and sustainable alternative to co.ventional,energyintensive desulfurization techniques for petroleum ***,its development is greatly plagued by the low capability in generating highly reactive oxygen species and sluggish kinetics of sulfide oxidation of reported *** we report a class of MoO_(x)nanocluster deco.ated on ultrathin Mo-doped TiO_(2)nanosheet(MoO_(x)/MoTiO)catalyst for efficiently facilitating the photocatalytic aerobic oxidation of *** demonstrate that MoO_(x)/MoTiO can not only promote the generation of highly reactive singlet oxygen(^(1)O_(2))but also enhance the aerobic co.version of sulfides,which leads to a reco.d dibenzothiophene oxidation activity of 3.90 mmol g^(-1)h^(-1).The multiple experimental characterizations and density functional theory calculations co.lectively reveal that the doped-Mo sites can interact with the photogenerated excitons,enabling directly energy transfer generation of^(1)O_(2)through a new exciton modulation mechanism,and the co.rdination unsaturated MoO_(x)clusters play the role of co.catalyst to enhance the separation of charge carriers,and effectively catalyze the reaction between sulfides and1O_(2)to form sulfones.

关键词： titanium dioxide photocatalytic aerobic oxidation desulfurization dibenzothiophene singlet oxygen

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基于IMS架构的业务应用

世界电信 2006年第6期19卷 59-60页

作者： huawei technologies co., ltd. 华为技术有限公司

IMS多媒体子系统是一种由SIP业务到支持实时的、可定制的多媒体业务的完整解决方案，支持一个终端同时运行多个SIP Session，创造全新的数据服务，为未来的全IP网络搭建统一的基于IP的应用平台，给运营商网络带来积极变革并为开发新的... 详细信息

IMS多媒体子系统是一种由SIP业务到支持实时的、可定制的多媒体业务的完整解决方案，支持一个终端同时运行多个SIP Session，创造全新的数据服务，为未来的全IP网络搭建统一的基于IP的应用平台，给运营商网络带来积极变革并为开发新的业务奠定了基础。

关键词：业务应用 IMS 多媒体业务全IP网络架构 IP业务数据服务应用平台子系统

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基站技术发展历程及趋势

邮电设计技术 2006年第11期 42-44页

作者： huawei technologies co., ltd. 华为技术有限公司

1基站的演进历程基站作为移动通信系统中最关键的设备,随着移动通信技术的发展正发生着深刻的变化.从第一代模拟通信系统(AMPS/TACS)的应用,到目前被第二代窄带数字移动通信系统(GSM/CDMA/PHS)所替代,大约经历了15年左右,其间主要解决... 详细信息

1基站的演进历程基站作为移动通信系统中最关键的设备,随着移动通信技术的发展正发生着深刻的变化.从第一代模拟通信系统(AMPS/TACS)的应用,到目前被第二代窄带数字移动通信系统(GSM/CDMA/PHS)所替代,大约经历了15年左右,其间主要解决通话的需求.随着数字技术发展引起的革命,出现了形形色色的各种数据业务,此时的移动通信主要解决的是通话和小数据量型业务需求.

关键词：移动通信技术数字移动通信系统基站 CDMA 数字技术数据业务业务需求

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PSTN演进与IMS

世界电信 2006年第5期19卷 54-56页

作者： huawei technologies co., ltd. 华为技术有限公司

全世界的固网运营商在过去的几年承受着整网业务收入下跌的压力,寻找增加收入的新机会,已经成为全球固定网络运营商关注的首要问题。固网运营商希望通过优化网络结构,降低网络OPEX,采用新技术,提供新业务带来新的收入。IMS作为下一代网... 详细信息

全世界的固网运营商在过去的几年承受着整网业务收入下跌的压力,寻找增加收入的新机会,已经成为全球固定网络运营商关注的首要问题。固网运营商希望通过优化网络结构,降低网络OPEX,采用新技术,提供新业务带来新的收入。IMS作为下一代网络的架构在业界已经讨论得非常火热,将探讨一下PSTN网络的演进和IMS问题。

关键词：固网运营商转型 IMS PSTN 网络演进