Stability and Bifurcation Analysis of Man-machine System with Time Delay

A mathematical model of man-machine system is considered.Based on the reference [4],the direction and stability of the Hopf bifurcation are determined using the normal form method and the center manifold theory.Furthermore,the existence of Hopf-zero bifurcation is discussed.In the end,some numerical simulations are carried out to illustrate the results found.

A Model of Application System for Man-Machine-Environment System Engineering in Vessels Based on IDEF0

Applying man-machine-environment system engineering(MMESE)in vessels is a method to improve the effectiveness of the interaction between equipment, environment, and humans for the purpose of advancing operating efficiency, performance, safety, and habitability of a vessel and its subsystems. In the following research, the life cycle of vessels was divided into 9 phases, and 15 research subjects were also identified from among these phases. The 15 subjects were systemized, and then the man-machine-environment engineering system application model for vessels was developed using the ICAM definition method 0 (IDEF0), which is a systematical modeling method. This system model bridges the gap between the data and information flow of every two associated subjects with the major basic research methods and approaches included, which brings the formerly relatively independent subjects together as a whole. The application of this systematic model should facilitate the application of man-machine-environment system engineering in vessels, especially at the conceptual and embodiment design phases. The managers and designers can deal with detailed tasks quickly and efficiently while reducing repetitive work.

Research on menu-typed man-machine interaction system of digital TIG welding machine

A digital man-machine interaction system controlled by communications between two processors of TMS320F240 and AT98C2051 was researched in the paper. The system is easy to set and modify welding process parameters by keyboards, and display information of welding site by LCD (Liquid Crystal Display). As one part of multi-task system about TIG welding machine, the coordination of man-machine interaction system with other tasks is the main point to the stability and reliability of its operation. Experiments result indicates that the system is stable, operation-flexible, high precision, and anti-interfering.

Conformal invariance and Hojman conserved quantities of canonical Hamilton systems

This paper discusses the conformal invariance by infinitesimal transformations of canonical Hamilton systems. The necessary and sufficient conditions of conformal invarianee being Lie symmetrical simultaneously by the action of infinitesimal transformations are given. The determining equations of the conformal invariance are gained. Then the Hojman conserved quantities of conformal invariance by special infinitesimal transformations are obtained. Finally an illustrative example is given to verify the results.

IT Asset Management of Industrial Automation Systems

1. Introduction The installation and administration of large heterogeneous IT infrastructures, for enterprises as well industrial automation systems, are becoming more and more complex and time consuming. The growing number of interconnections between networks, the development of new intelligent IT devices, and increasingly sophisticated computer hard-

STATUS AND DYNAMIC CHANGE OF REGIONAL MAN- LAND SYSTEM IN VIEW OF MICRO-LEVEL QUANTITATIVE ASPECT -Case Study of Gongyi City of Henan Province

A micro-level analysis on man-land system is important in understanding the content of human geography in rural areas, particularly in the different regions. This paper is based on a survey undertaken in the three villages of Wugou Village, Hutuo Village, and Xiaonan Village of Gongyi City, Henan Province in April 2003. The survey covers three types of economic and social activities from 214 households. Data collected include 120 attributes for each household. By using theories from the relevant disciplines such as geography, mathematics, physics, ecology, and system sciences, this paper develops a framework employing the concept of system entropy in the status function of the man-land system. In this framework, the entropy change is used to show the evolution of the system, and the entropy flow to express the flow among the spatial parts of the system. Following the framework, and using a large set of household data from surveys, the paper makes a quantitative analysis of the village-level man-land system from a micro-perspective. After a theoretical investigation, the corresponding strategies in the paper are then put forward in order to adjust the unbalanced trend of the village man-land system from both perspectives of small-area and individual actors.

ON EVOLUTION OF MAN-LAND SYSTEM IN OASIS-Taking Minqin Basin as a Case

Human beings have had a tremendous i mpact on natural ecosystems and are n ow the principal power to change the biosphere.It is logical t hat we should pay close attention to t he interaction between human system s and environ-mental systems.Taking Minqin basin,Gansu Province,as a case,this paper focuses on the evolution of regional physi-cal environments and the cultural sy stems by which people maintain their relationships with those environme nts.This pa-per presents the conceptual framewo rk for the man-land system.Expectin g to accelerate the regional sustain able develop-ment,it also analyses the evolution ary mechanism of regional man-land s ystem.On the basis of reviewing and a nalyzing the evolution of man-land system in Minqin basin,the paper also brings fo rward an adjusting mode for the studi ed area,which consists of three aspects:to b uild up a concept that economic growt h must harmonize with environmental quality’s and land productivity’s improvemen t;to make a whole planning and management in the drainage area;and to push for-ward the technique of water-saving i rrigation and establish water-saving agricultural system.It’s meanin gful for resource exploitation and sustainable development of Chinese northwestern arid area,which is represented by Minqin basin,by under-standing what great changes the basin has experienced and is experiencin g at the global background,and studying its time order and territorial structure,th e system’s character and law of evolu tion,trend and the regulating ways t o improve man-land relationship.

Design and research on a variable ballast system for deep-sea manned submersibles

Variable ballast systems are necessary for manned submersibles to adjust their buoyancy.In this paper,the design of a variable ballast system for a manned submersible is described.The variable ballast system uses a super high pressure hydraulic seawater system.A super high pressure seawater pump and a deep-sea brushless DC motor are used to pump seawater into or from the variable ballast tank,increasing or decreasing the weight of the manned submersible.A magnetostrictive linear displacement transducer can detect the seawater level in the variable ballast tank.Some seawater valves are used to control pumping direction and control on-off states.The design and testing procedure for the valves is described.Finally,the future development of variable ballast systems and seawater hydraulic systems is projected.

Formation and adjustment of manned/unmanned combat aerial vehicle cooperative engagement system

Manned combat aerial vehicles （MCAVs）, and un-manned combat aerial vehicles （UCAVs） together form a cooper-ative engagement system to carry out operational mission, whichwill be a new air engagement style in the near future. On the basisof analyzing the structure of the MCAV/UCAV cooperative engage-ment system, this paper divides the unique system into three hi-erarchical levels, respectively, i.e., mission level, task-cluster leveland task level. To solve the formation and adjustment problem ofthe latter two levels, three corresponding mathematical modelsare established. To solve these models, three algorithms calledquantum artificial bee colony （QABC） algorithm, greedy strategy（GS） and two-stage greedy strategy （TSGS） are proposed. Finally,a series of simulation experiments are designed to verify the effec-tiveness and superiority of the proposed algorithms.

Recent Development in the Space Utility System of China's Manned Space Flight Program

This paper briefly introduces the history of China's Manned Space Flight Program and concludes the experiments done since 2008,namely,a small satellite and a material science experiment.An outlook of future Chinese Space Station is also described at the end.

Prediction and coordination of the man-environment system—a case study in Jiaozuo City

In this paper, the new systematical theory and methodology have been applied to the research on the structure, development and coordination of man-environment system in Jiaozuo City. It has been proved that the application of self-organization theory of synergism is successful. Furthermore, on the basis of self-organization theory, a series of mathematical models have been established. The prediction of the status of man-environment system in Jiaozuo City by the year 2010, was made, and the trend of population growth, industrial development, environmental pollution were given. Finally, suggestions for the future development of Jiaozuo City were mentioned.

基于“马赛克战”的水下有人-无人作战使用探讨

通过对“马赛克战”概念的背景和特点进行分析,提出基于马赛克的水下攻防作战运用构想,构建基于马赛克的水下有人-无人作战网络,分析多域背景下水下OODA作战网络的构成,利用OODA作战环理论对水下马赛克作战网络作战能力进行分析,并提出水下马赛克作战网络对抗单个平台和对抗作战网络的使用方法。最后,从通信组网、集群使用、人工智能、察打一体等4个方面对“马赛克战”概念下水下无人航行器装备使用提出建议。

单增李斯特菌PTS系统转运蛋白IIB^(man)介导运动性和感染的功能研究

为探究单增李斯特菌(LM)磷酸转移酶系统(PTS)转运蛋白IIB^(man)在LM生长、运动性及其生物学功能,本研究以LM EGD-e株基因组为模板,经PCR扩增iiB^(man)基因的上下游基因片段(不包含iiB^(man)基因),插入质粒pKSV7以构建缺失质粒;以LM EGD-e基因组为模板,采用PCR扩增iiB^(man)基因与启动子片段,插入质粒pIMK2以构建回补质粒,经PCR和测序鉴定后,将缺失质粒转化LM EGD-e感受态细胞,通过氯霉素抗性及42℃压力下使重组质粒与LM EGD-e株的同源片段发生同源重组单交换获得一代同源重组菌株,然后在无抗性培养基中30℃培养使质粒丢失,获得缺失株ΔiiB^(man)。将回补质粒转化ΔiiB^(man)感受态细胞中,通过卡那霉素抗性筛选获得回补株CΔiiB^(man),缺失株和回补株均经PCR和测序鉴定。37℃培养EGD-e、ΔiiB^(man)、CΔiiB^(man)12 h,期间每隔1 h测定OD_(600nm)并绘制生长曲线,分析各菌株生长特性,结果显示,各菌株体外生长趋势相似。将各菌株菌液接种于TSA半固体培养基,培养至24 h和48 h时检测细菌运动圈大小,结果显示ΔiiB^(man)的运动圈直径分别是EGD-e的1.5及1.6倍(P<0.05、P<0.01),CΔiiB^(man)与EGD-e运动圈直径均基本一致。在各菌株培养上清中加入绵羊血,检测各菌株溶血能力,结果显示,ΔiiB^(man)的溶血能力较EGD-e及CΔiiB^(man)增强。将各菌株以MOI 20感染RAW264.7细胞,在感染后2 h、5 h和8 h收集细胞进行点样计数,结果显示,在感染后2 h和5 h时ΔiiB^(man)的胞内增殖能力较EGD-e及CΔiiB^(man)显著增强(P<0.05)。将各菌株以2×10^(5)cfu/只经腹腔注射感染小鼠48 h后剖杀,取肝脏和脾脏研磨并点样计数,结果显示,ΔiiB^(man)在小鼠脏器载菌量较EGD-e及CΔiiB^(man)极显著增多(P<0.001)。上述结果首次表明IIB^(man)不影响LM的生长,但影响LM的运动性及提高LM的体外溶血活性;IIB^(man)参与LM的胞内增殖和宿主脏器定植。本研究为了解LM PTS系统所介导的细菌体外环境适应及宿主感染的分子机制,以及LM感染的防控奠定了基础。

药食同源理论及其在航天营养健康研究中的应用

载人航天飞行中面临的重力场变化、辐射、狭小空间孤闭隔离、噪声及生物节律变化等航天特因环境给维持航天员机体营养健康带来了挑战。根据载人航天实践,综述了航天特因环境下机体适应性变化,阐述了药食同源在航天营养健康保障中的应用预先研究现状,分析并提出了药食同源在支持未来载人深空探测方面的潜在应用价值。

系统思维在载人潜水器设计中的应用

系统思维以及系统方法论在复杂巨系统的设计上有着极大优势。载人潜水器作为一种大型装备,其设计过程中大量采用了系统方法论。本文对载人潜水器的组成、功能等进行介绍,对系统思维和系统方法论应用于载人潜水器设计的必要性进行分析,对常见的系统方法论进行介绍。并结合具体示例,从载人潜水器总体、载人潜水器分系统之间、载人潜水器分系统自身等层面,对载人潜水器设计过程中所采用的系统方法进行介绍。最后,以生命支持分系统为例,从该系统的运行时长及故障数量角度出发,验证系统思维和系统方法论在该系统的设计过程中发挥的作用。

教学过程智能化发展评估新方向——《2023人工智能促进教育发展报告》节选三

智能技术的快速发展深刻影响着教育的理念重塑和形态变革。教学过程智能化对促进人的个性化发展,培养创新型人才,形成人才竞争力具有重要意义。通过检索国内外文献发现,目前尚未形成科学完善的教学过程智能化发展评价指标体系。该研究采用调查研究、专家访谈等方法,系统构建了教学过程智能化发展评价框架体系,并通过专家调查法和层次分析法对各项指标体系进行权重计算,最终形成包括人机协同与具体教学过程应用2个二级指标、13个3级指标的教学过程智能化发展评价指标体系,完善人工智能促进教育发展的评估体系,明确教学过程研究的未来指向,有助于推动智能技术全面融入教学全过程,为数字教学改革发展与评价提供参照。

新时代生态文明制度体系的基本内涵、原则架构和鲜明特征

新时代生态文明制度体系是进入新时代以来,以国家治理体系和治理能力现代化为保障的规范体系,其中蕴含着中国共产党是生态文明制度体系建设的领导力量,全体社会成员都要受生态文明制度体系的约束,主要处理生态文明领域的国家事务和社会事务。新时代生态文明制度体系的原则架构是以生态文明体制改革的“六个坚持”为基本原则、以社会主义制度为根本依据、以生态文明领域中若干重大制度为基础性规范、以生态文明建设具体领域一系列重要体制机制为全面表现。新时代生态文明制度体系具有以下鲜明特征:(1)鲜明的现实性,即在新时代生态文明建设实践中形成和发展;(2)系统的完备性,即生态文明法治和制度越来越完整严密;(3)保障的规范性,即真正实现用规范的制度来管理生态环境;(4)持续的发展性,即与时俱进地推进生态文明制度体系创新;(5)根本的政治性,即“四维”政治性质在生态文明领域具体展开;(6)价值的人民性,即始终以人民对优美生态环境需要为中心。

载人月球探测混合云架构体系仿真系统研究

针对载人月球探测工程任务需求,设计了一种基于混合云架构的体系仿真系统,实现了辅助设计、方案验证和协助任务等功能应用。分别从任务设计和应用模式角度分析了体系仿真系统功能需求;根据需求给出体系仿真系统总体架构,采用仿真平台和仿真支持库统筹建设的方式,完成了系统开发与集成;提出了针对体系仿真系统建设涉及的体系建模、任务规划、推演展示、效能评估和系统联动与扩展关键技术实现方案;应用该系统实现了对典型载人月面活动场景的仿真,得到了关键参数模拟推演结果,验证了体系仿真系统各项功能有效性和正确性;最后给出了思考和展望。该体系仿真系统可支撑未来载人月球探测相关任务开展发展论证和综合评估验证,能够为同类系统开发提供方案参考。

面向有人/无人协同的智能通信与组网关键技术:现状与趋势

系统总结了有人/无人协同的智能通信与组网领域的研究成果。首先,从有人/无人协同的应用场景出发,具体分析了其对通信组网的需求。然后,自底而上按照物理层、链路层、网络层的层次划分,深入阐述了通信信道建模、通信波形设计、组网架构与协议、智能协同等关键问题,分析了研究现状和代表性技术的特点。最后,面向更加智能、高效、灵活的有人/无人协同通信与组网,展望了可能的发展趋势和极具潜力的技术方向。

猎户座飞船电源系统设计特点及启示

针对登月飞船电源系统在功率密度、承载性、安全性、可靠性等方面的更高要求,调研了美国猎户座飞船电源系统总体方案,发电、控制、储能等功能产品详细方案,以及部分地面测试和在轨飞行情况。对猎户座飞船电源系统供配电架构、冗余度及可靠性设计、电池类产品安全性设计、结构机构类产品承载性设计等进行分析,梳理出登月飞船电源系统研制过程中需重点关注的问题及建议,可为中国该类飞船电源系统研制提供技术参考。