Thermodynamic and Equilibrium Composition Analysis of Using Iron Oxide as an Oxygen Carrier in Nonflame Combustion Technology

Nonflame combustion technology （NFCT） is a harmonious energy utilization technology. There are not environmental-unfriendly gases such as NOx, CO2 discharged in the whole combustion process. Combustion processes realizes zero emission through this technology. Fe2O3 is involved as oxygen carrier, is examined thermodynamically, and the thermodynamic data of the redox reactions are calculated. Using the criteria of minimizing the Gibbs free energy, the equilibrium composition was investigated. The equilibrium analysis shows that producing complete oxidized resultants must have high molar ratio of Fe2O3/CH4. If quantity of Fe2O3 is not sufficient, more partial oxidized products such as CO, H2, even C will be produced.

Thermodynamic Analysis and Experimental Investigation into Nonflame Combustion Technology(NFCT) with Thermal Cyclic Carrier

The utilization of fossil fuels causes serious negative impacts on the environment and human life. To mitigate greenhouse gases and other pollutants, a novel combustion process-the nonflame combustion technology with a thermal cyclic carrier of molten salt is introduced. In this technology, a whole combustion is divided into two steps, i.e., the section of producing oxide and the section of combustion. In the first step, oxygen is separated from air, and pure N_2 is simultaneously formed which is easily recovered. In the other step, the fuels react with lattice oxygen in the oxides formed in the first step, and at the same time, thermal energy, CO_2 and H_2O vapor are produced. It is noted that the CO_2 is easily separated from water vapor and ultimately captured. Theoretically, there are no environmental-unfriendly gases such as CO_2, NO_x and SO_2 discharged in the whole combustion process. Some metal oxides scattered into molten salts play the roles of oxygen carriers in the combustion system, and they can constantly charge and discharge oxygen element from air to fuels during the combustion process. A nonflame combustion system with Li_2CO_3+K_2CO_3+Na_2SO_4 as the molten salt system, CH_4 as the fuel and CuO as the catalyst was experimentally investigated. The experimental results show that the combustion process proceeded as it was theoretically analyzed, and CO_2 with a high volume fraction of 77.0%_95.0% and N_2 with a high volume fraction of 91.9%_99.3% were obtained. The high concentration of CO_2 is favorable for capturing and storing subsequently. Therefore, the potential of reducing CO_2 emissions of this nonflame combustion technology is huge.

Technology Development and Deployment Strategy of Carrier Ethernet

Carrier Ethernet(CE) is gradually stepping away from standardization and testing to deployment and application in live networks.Although great improvement has been made in the reliability of various CE technologies,there is need for improvement in their Quality of Service(QoS),Operation,Administration and Maintenance(OAM),especially the multi-vendor interoperability.The deployment of CE should be service-oriented,and the factors,such as maturity of related technologies and standards,deployment costs,and the complexity of network reconstruction as well as the interoperability with other vendors,should be taken into full consideration to flexibly select appropriate networking technology for different application scenarios according to technical features.

T-MPLS Technology and Application on Carrier Ethernet

As a connection-oriented packet transport technology,Transport Multi-Protocol Label Switching(T-MPLS) is an important bearer technology for Carrier Ethernet(CE).This article starts with the technological characteristics of T-MPLS,then goes on to the latest T-MPLS standardization progress and challenges,followed by the description of T-MPLS based CE architecture.Next,the article covers several key technologies related with T-MPLS,including the data forwarding plane,control plane,network survivability,and Operation,Administration and Maintenance(OAM).Finally,the article analyzes the applications of T-MPLS based CE.

Ring Network Technology for Carrier Ethernet

The fast development of IP services forces the traffic flow in the networks to move gradually from Time Division Multiplexing(TDM) services to packet data services.To adapt to the change,low-cost Ethernet technologies are introduced into the Metropolitan Area Network(MAN).Ring network control protocols and ring network protection technologies are applied to guarantee manageability and reliability required in the telecom networks.The Ethernet Ring Protection(ERP) and Resilient Packet Ring(RPR) are two different ring protection technologies.The Transport Multi-Protocol Label Switching(T-MPLS) network uses the T-MPLS Shared Protection Ring(TM-SPRing) technology to provide ring protection.Carriers can expand the protection as needed and use appropriate ring technologies to meet the requirements of Carrier Ethernet(CE).

Study of the EAST Fast Control Power Supply Based on Carrier Phase-Shift PWM

EAST （experimental advanced superconducting tokamak） fast control power supply is a high-capacity single-phase AC/DC/AC inverter power supply, which traces the displacement signal of plasma, and excites coils in a vacuum vessel to produce a magnetic field that realizes plasma stabilization. To meet the requirements of a large current and fast response, the multi- ple structure of the carrier phase-shift three-level inverter is presented, which realizes parallelled multi-inverters, raises the equivalent switching frequency of the inverters and improves the per- formance of output waves. In this work the design scheme is analyzed, and the output harmonic characteristic of parallel inverters is studied. The simulation and experimental results confirm that the scheme and control strategy is valid. The power supply system can supply a large current, and has a perfect performance on harmonic features as well as the ability of a fast response.

Carrier Ethernet Services and Technologies

Carrier Ethernet(CE) services generally refer to the standardized carrier-class transfer services that feature in excellent scalability,reliability,manageability and Quality of Service(QoS) guarantee,and are offered by carriers to users based on Ethernet technologies.One of the important characteristics of CE service is the diversity of its implementation technologies.Enhanced Ethernet technologies consider scalability as their chief objective so as to extend conventional Ethernet bridge technologies;the latest Provider Backbone Bridge Traffic Engineering(PBB-TE) emerges as the technical trend of CE technology.Multi-Protocol Label Switch(MPLS) offers reliable Pseudowire(PW) connections for CE based on Label Switching Path(LSP).The convergence of MPLS and PBB is one of the important evolution trends for CE.Making full use of the existing Optical Transport Network(OTN) infrastructure,the optical ring network technology is the most cost-efficient and effective way to deliver CE services;its future development trend is characterized by enhancing the Operation,Administration and Maintenance(OAM) function and the control plane.

不同海况条件下舰载无人机着舰安全分析

针对无人机上舰的使用需求,本文对舰载无人机着舰开展了系统的研究。建立了机-舰-环境综合模型和舰载无人机全自动着舰引导控制系统;基于建立的舰载无人机着舰综合模型对不同海况下的着舰过程进行仿真分析,研究不同海况条件以及航母不同航速和遭遇角对着舰安全的影响。仿真研究表明:在复杂海况下,航母可通过适当提高航速以获得更高的着舰成功率,但过高的航速会导致舰尾流扰动加剧,使得着舰成功率显著下降;通过对仿真结果进行统计分析,给出了不同海况下的着舰安全范围,为无人机着舰辅助决策提供参考。

基于载体环境的宽带微带天线设计与分析

为确保航天环境下载体内的微带天线性能满足通信系统要求,采用多层和多模技术设计了单开槽WiFi频段的宽带微带天线,重点对载体及环境因素下宽带微带天线的性能进行仿真验证,同时分析了对天线性能的影响,并采用迭代补偿方法进行了性能修正。仿真分析结果表明:提出的迭代补偿方法对微带天线性能可以进行有效的校正;实物验证结果表明:载体内的微带天线性能稳定,满足工作频带要求。

微生物固定化技术及在废水处理中的应用

在探究了微生物固定化技术在不同废水环境中的应用情况后,总结了不同微生物固定方法且比较了各种方法的优缺点,并对微生物固定化载体的选择因素及材料分类进行说明。最后,简要讨论了微生物固定化技术在水污染治理实际应用中所存在的问题,并对未来的研究提供了参考方向。

面向激光测振应用的改进相位生成载波解调算法

为了解决相位生成载波解调方案应用于激光测振技术时,系统中存在的非线性失真问题,提出一种改进相位生成载波解调算法。该算法采用低频、大幅值的相位调制和迭代重加权椭圆特殊拟合对两路含有非线性误差的正交信号进行校正以抑制非线性失真。其中,低频相位调制由三角波信号驱动压电换能器生成,确保小信号情况下椭圆拟合结果的准确性。迭代重加权椭圆特殊拟合可以减小离群数据的影响并避免拟合结果退化为双曲线,具有精度高、鲁棒性好和计算效率高的优点。实验结果表明改进相位生成载波解调算法可以有效抑制激光测振实验系统的非线性失真,在不同相位调制深度(0.8~3.4 rad)下解调信号的信纳比和总谐波失真稳定,对应的标准差分别为0.55 dB和0.03%。系统的响应线性度优于99.99%,动态范围可达103.9 dB@500 Hz,总谐波失真为1%且工作频宽为20~8000 Hz。与传统相位生成载波解调方案相比,该算法不仅显著抑制了非线性失真,还克服了椭圆拟合算法在小信号下无法工作的缺点。

屏幕的演化与未来展望——技术文化史视角的溯源与反思

屏幕已然成为人类存在状况的最新征候。信息文明与载体演变共同推动着屏幕时代的来临。文章基于技术文化史视角,聚焦大众的技术使用及其社会文化影响,把屏幕的本质限定于文化消费与文化生活的层面。作为文化消费终端的极致体现,屏幕的演化可分为四个阶段,分别对应了文化消费与文化生活的四次重大变迁:电影屏幕之于“显像”阶段,电视屏幕之于“入户”阶段,电脑屏幕之于“齐一”阶段,手机屏幕之于“独霸”阶段。这一演化历程也体现为虚实融合与载体强化的过程。最终,数字化消解了影像的物质性,也使人与影像之间的中介形式大一统为数字屏幕。屏幕本身的物质局限性引发了人们对于后屏幕时代的畅想,物质性界面的消融则提供了从有屏到无屏的巨大想象空间,而当下屏幕带来的诸多异化也会在未来被更高级的技术形态所制衡。

我国文化创意产品设计的文献综述研究

本文以文创产品设计在我国具有重要地位为研究背景,基于文献计量和内容分析法对我国文创产品设计相关文献研究中的内容、最新理论方法与技术进行系统梳理,探究我国文创产品设计研究现状和未来发展趋势。本研究最终得出以下结论:博物馆文创产品在故宫文创设计的带领下正在不断突破,积极打造独具特色的文创产品设计;图书馆文创产品设计未来发展前景广阔;文创产品与我国传统文化在融合中创新发展;传统村落文创产品设计研究迫在眉睫;文创产品设计研究新方法与技术不断涌现,这些极具价值的研究为我国文创产品设计发展奠定了坚实基础。

脂肪酶固定化技术的研究进展

该文介绍了脂肪酶的传统及新型固定化技术,特别针对纳米载体、磁性载体、微波辅助固定化技术、膜固定化技术等近年来发展的新载体和新技术进行概述,描述了通过固定化来改善脂肪酶的催化性能,包括酶的活力、稳定性、最适条件以及特异性等。提出目前脂肪酶固定化所面临的稳定性差、难以工业化应用等问题,并指出未来脂肪酶固定化技术应向着性质稳定、操作简单以及规模化生产的方向发展。

生成式人工智能时代中学生法治素养培育的载体与路向

新兴的生成式人工智能,因其颠覆性的技术革新,运用大数据客观分析当前的中学课堂中法治素养培育存在的不足,可以精准定位人工智能与中学生法治素养培育的契合性,创新中学法治素养培育的课堂教学形式。智能技术的运用为加强中学课堂中法治素养的培育,进而落实全面依法治国提供了技术载体支撑与实践路径指向。基于此,围绕教师的法治教学模式的丰富化、教学资源的多样化,以及教学环境的智能化等,构建智能时代教师法治教育的创新发展路向,指向培养学生具有逻辑性思维、创造性思维与理智性思维的法治素养,进而厘清人工智能的发展对中学生法治素养培育的促进机制,探寻人工智能时代学生法治素养培育的本质所在。

基于大数据的激光通信光纤时延波动测量仿真

空间激光通信光纤的传输频带宽、距离远且通信容量大,但是易受环境温度和激光器波长影响出现时延波动问题。为解决以上问题,提出基于大数据的空间激光通信光纤时延波动测量方法。构建光载波传输模型,分析光纤时延波动的影响因素。采用大数据技术测量时延波动,获得其初始测量值,通过卡尔曼滤波方法处理并提高测量值的精度,完成空间激光通信光纤时延波动的精准测量。实验结果表明,空间激光通信光纤距离不断增加时,时延波动量不断增大,研究方法测量结果与实际值具有较高拟合度,且对时延波动的跟踪精度高,不确定度保持在10ps以内。

隐身舰载机突防岸基雷达网作战运用研究现状与展望

现代战争中,隐身舰载机在对陆突防打击作战中的应用越来越频繁,但随着雷达性能和反隐身技术的发展,隐身舰载机突防作战显得越来越困难。论文首先介绍了当前隐身舰载机发展现状,并对相关问题进展进行了介绍;然后,阐明了隐身舰载机突防岸基雷达网的作战运用流程框架,并从隐身突防和反隐身的角度梳理了突防岸基雷达网的相关技术和能力;最后,对未来隐身舰载机作战运用和发展方向进行了总结和展望。

智能完井井下负载对测控系统的影响分析

阐述电力线载波通信技术特点、基于智能完井双向通信电路的通信系统仿真模型。探讨室内短距离通信技术中的电力线与合适通信载波频率的选择、井下变功率双向通信系统的应用。

浮动载波技术在中波数字调幅发射机上的应用

随着通信技术的飞速发展,浮动载波技术因其灵活的频率调整能力,逐渐在中波数字调幅发射机领域受到广泛关注。这种技术不仅为广播行业带来了更高的信号适应性,而且在应急通信和节目切换等领域展现出独特的价值。通过深入分析浮动载波技术在中波数字调幅发射机上的应用及其相关注意事项,揭示其在广播电视、应急通信等领域的应用价值。

5G承载网技术及组网的应用研究

随着信息化时代的不断发展,移动通信技术已成为现代社会的重要基础设施,而5G以其高速、低时延、大连接等特点,极大地推动了物联网、智能制造、智慧城市等各行各业的发展。文中对5G承载网技术展开了详细研究,结合具体案例,系统论述了5G承载网技术组网的应用,以期为进一步提高5G网络技术的应用水平提供支持。