一种农业自动化灌溉系统的高效能设计研究

以进一步提升农业自动化灌溉系统的作业效率为研究目标,选取其核心结构组件布局作为研究对象,基于通信控制优化理念展开高效能设计研究。结合自动化灌溉系统的运行机理,从通信网络架构分层角度入手,建立灌溉系统参数计算处理模型。针对系统软件控制和硬件配置完成优化,选定灌溉作物进行灌溉试验,结果表明:此通信网络架构理念下的控制优化布局,可实现灌溉系统的响应准确率与决策准确率同步提升,系统运行稳定有效;整体系统的灌溉效率可达94.55%,满足智能化灌溉控制设计要求,具有很好的应用推广价值。研究结果对于灌溉系统向智能化精准化提升有较好的启示意义。

提升代建制模式下工程设计管理效能的方法探讨

代建制模式下的工程项目具有参建单位多、各方工作界面划分模糊、沟通协调程序复杂等特点,针对代建制工程的特点优化工程设计管理程序,对于保障项目设计质量、提高项目整体效益等方面具有重大意义。论文系统介绍了代建制模式下的工程设计管理程序,分析了这一程序的重要意义,并深入探讨了影响工程设计管理效能的主要制约因素。针对现有的挑战,论文提出了一系列优化措施,包括引导业主决策、建立有效沟通机制、优化设计资源以及强化管理团队建设,旨在提高工程设计管理的整体效能。

数字资源助力小学数学高效能作业设计的实践与应用

在数字化时代,数字资源在教育领域的应用越来越广泛,特别是在小学数学教学中,教师可以创新小学数学作业设计,以高效能的方式来提高学生的学习效果。数字资源在作业设计中的优势在于其丰富性、互动性和个性化。本文旨在探讨如何利用数字资源创新小学数学作业设计,以提高学生的学习效果。文章从数字资源在小学数学高效能作业设计中的优势、需要注意的问题以及应用实践等方面展开论述。

提升数字媒体艺术专业学生设计产出效能的方法探讨

从数字媒体艺术专业人才培养角度和数字艺术行业的从业要求角度明确命题创作训练的真正目的——对学生设计产出效能进行评估。通过对构成学生设计产出效能的命题理解和把握能力、审美和艺术创造能力、数字技术应用和实现能力、成本评估和控制能力进行深入分析,尝试借鉴绘画教学中的大脑闪像狭窄输入法的相关理论,探寻提升数字媒体艺术专业学生设计产出效能的方法。

“双减”背景下小学数学高效能作业设计策略研究

随着“双减”政策的深入推进,人们对于教育工作提出了更高要求。在新时期中,教师需要将学生作为教学主体来进行有效学习,而小学阶段是一个人一生发展最重要的关键时期,也是培养儿童个性和能力最为关键的时段,为了能够让孩子们更好地成长,就必须要对其布置出更加高效且合理的作业,并且还需要根据不同年龄段学生的特点以及具体情况制定相应的作业形式,才能达到真正意义上的提升学习效果的目的。为此,这就要求小学数学教师应该注重对学生思维方式、知识技能等方面的指导与引导,从而帮助他们掌握必要的数学知识及方法,并通过适当的手段使之获得较好的学习成绩,提高自身综合素质水平,进而为日后顺利步入社会奠定坚实的基础。

关注消防疏散应急照明设计中的问题

近年各地发生的重大火灾事故中,造成死伤惨重的原因,大多因为疏散不畅、通道阻塞,受烟雾窒息、拥堵踩死和跳楼逃生受伤者居多.审视应急疏散照明和疏散标志照明,改进存在的问题,发挥其最大效能,方能减少损失.

方舱车通讯接口窗电磁屏蔽效能测试方法研究

方舱车是一类特殊的功能性车辆,可以简单将其理解为搭载方舱的车辆,此类车辆大多具有专门化的功能设计,而其功能性主要来源于方舱内搭载的设备。我国方舱车的研究与发展起步于上世纪90年代初期,单纯从结构上来说,房车、厢车等均可归为方舱车范畴。本文就放舱车通讯接口窗电磁屏蔽的设计和调试进行研究,以明确其效能,为方舱车电磁屏蔽技术优化与创新提供启发。

城市道路附属设施设计理念探讨

阐述了城市道路设计中"附属设施"设计的重要性,结合城市道路设计过程中存在的问题及建设现状,探讨了"无障碍设施、公交站台、交通设施、道路绿化"等附属设施的设计理念.

采矿巷道设计效率的研究

采用层次分析法建立一种评价煤矿巷道设计效率的方法,阐述了自然因素、地质力学因素、采矿和技术因素对巷道稳定性的影响。对巷道设计和维护影响最大的因素有构造扰动、地震活动、岩体节理和抗压强度、附近开采巷道和支护承载能力。根据层次分析法的结果,对各影响因素对巷道支护设计及其稳定性的影响进行了百分比评价。根据所列指标,可以规划修改后的承载力支护方案。

Capacity-Power Consumption and Energy-Efficiency Evaluation of Green Wireless Networks

In this paper,we discuss in detail the basic issue of green design and consider an energy efficiency function as the metric to evaluate green cellular networks.Specifically,we investigate the transmit power required for an expected transmission capacity and propose a capacity-power formula based on the energy conservation and the Shannon capacity theorem.Two novel definitions of cell interference depth and handoff dynamic model are introduced and the corresponding expression of energy efficiency function is derived.Numerical results show that the energy efficiency function is closely correlated with the transmitted/received power required and the cell radius.Our work provides a useful basis for research and evaluation on green design and technology of cellular networks.

Research on Energy Efficiency Design Index for Sea-going LNG Carriers

This paper describes the characteristics of liquefied natural gas （LNG） carriers briefly. The LNG carrier includes power plant selection, vapor treatment, liquid cargo tank type, etc. Two parameters fuel substitution rate and recovery of boil of gas （BOG） volume to energy efficiency design index （EEDI） formula are added, and EEDI formula of LNG carriers is established based on ship EEDI formula. Then, based on steam turbine propulsion device of LNG carriers, mathematical models of LNG carriers＇ reference line value are established in this paper. By verification, the EEDI formula of LNG carriers described in this paper can provide a reference for LNG carrier EEDI calculation and green shipbuilding.

Energy Saving and Power Factor Correction for Industrial Plants in Hebron District

Energy efficiency can be improved by reducing the amount of energy that we demand, and by changing our behaviors to reduce the amount of energy that we waste. This scheme manipulates the problem of incremental demand, and low Power Factor （PF） for industrial plants, starting with walk through surveys, data analysis, providing advices to insure personnel involvement, and suggestions of practical circuits to attain the target. Elements of effective energy management program can be configured of management commitment, audit, analysis and implementation. Energy management opportunities can he operational and maintenance strategies, retrofit or modification strategies and new design strategies. The new technique of Power Factor Correction （PFC） that has been designed was the High Active Boost Power Factor Correction Pre-regulator Circuit, which was resulted in single / three phase PFC of about unity, in hand with a regulated output single phase voltage of about 220 VAC.

Consideration of Shape Characteristics for Apartments Incorporating Daylight and Energy Performance

The objective of this paper is to design units with well-lighted environment and low-energy consumption in the apartment building. Their daylight and energy performance can be determined by the building shape and orientation. The paper initially produced the results of illuminations and energy efficiency using the daylight and thermal simulations by Autodesk ＂ECOTECT＂. It then provided the comparison on simulation results of two type buildings： Flat-type and L-type apartment. The available options for the design incorporating the environmental performance have less flexibility in fiat-type apartments than in L-type ones. The best unit in the fiat apartment is fixed from -45 to 45 degrees rotation, however, that in the L-type one can change depending on rotating the building. Moreover, if the upper level units had the appropriate environment, the lower level could have larger window areas in order to meet those daylight performance needs. Results show that the facade design should have the different window areas depending on the location of each unit. It can assist in the comfort and low-energy consumption design by using simulation tools that achieve the more predictable understandings.

Energy-Efficient Joint Content Caching and Small Base Station Activation Mechanism Design in Heterogeneous Cellular Networks

Heterogeneous cellular networks(HCNs), by introducing caching capability, has been considered as a promising technique in 5 G era, which can bring contents closer to users to reduce the transmission delay, save scarce bandwidth resource. Although many works have been done for caching in HCNs, from an energy perspective, there still exists much space to develop a more energy-efficient system when considering the fact that the majority of base stations are under-utilized in the most of the time. Therefore, in this paper, by taking the activation mechanism for the base stations into account, we study a joint caching and activation mechanism design to further improve the energy efficiency, then we formulate the optimization problem as an Integer Linear Programming problem(ILP) to maximize the system energy saving. Due to the enormous computation complexity for finding the optimal solution, we introduced a Quantum-inspired Evolutionary Algorithm(QEA) to iteratively provide the global best solution. Numerical results show that our proposed algorithm presents an excellent performance, which is far better than the strategy of only considering caching without deactivation mechanism in the actual, normal situation. We also provide performance comparison amongour QEA, random sleeping algorithm and greedy algorithm, numerical results illustrate our introduced QEA performs best in accuracy and global optimality.

On Energy Efficient Design for Dynamic CoMP Transmission in K-Tier Heterogeneous Cellular Networks

Motivated by the objective of pursuing revenue, improvement in coverage and reduction in energy cost for wireless communication networks have been of great significance for mobile operators. Therefore, heterogeneous cellular networks(HCNs) and Coordinated Multipoint(Co MP) transmission are considered as promising solutions to enhance the performances of wireless communication systems. This paper analyzed the K-tier HCNs with a dynamic downlink Co MP scheme, in which the flexible clusters of cooperative stations are determined by a connecting threshold θ. Using stochastic geometry, the coverage probability(CP) and energy efficiency(EE) of a K-tier HCN operating under this scheme are derived, based on which the trade-off between CP and EE is discovered and discussed. Simulation results show the validity of our derivations. The proposed schememay significantly reduce energy consumption sacrificing a small amount of CP, and outperforms the fixed scheme as well. The CP-EE trade-off are also revealed, whichsuggests suitable trade-off points between CP and EE that will deliver the maximum economic profitability. Tendencies discovered in this paper may provide the operators with opportunities for further optimization in pursuit of economic profitability.

IMPROVEMENT OF TCAM-BASED PACKET CLASSIFICATION ALGORITHM

The feature of Ternary Content Addressable Memories(TCAMs) makes them particularly attractive for IP address lookup and packet classification applications in a router system. However,the limitations of TCAMs impede their utilization. In this paper,the solutions for decreasing the power consumption and avoiding entry expansion in range matching are addressed. Experimental results demonstrate that the proposed techniques can make some big improvements on the performance of TCAMs in IP address lookup and packet classification.

COST:Coding over Spatial-Temporal Diversity for Low-Duty-Cycle WSNs

In low-duty-cycle wireless sensor networks,designers have to cope with unreliable links and limited communication capacity.In this work,we propose COST,a coding scheme that leverages spatial-temporal diversity to achieve higher energy efficiency and lower delay of packet transmissions.We particularly address long sleeping intervals in low-duty-cycle networks by exploiting multi-path diversity.Specifically,we propose to employ an erasure-coding scheme to improve reliability.With respect to energy efficiency and delivery timeliness,we formulate the problem in optimal allocation of coded blocks over multiple paths,which is then proved to be NP-hard.We further propose a near-optimal algorithm to solve the allocation problem.Through extensive simulations,we evaluate the impact of network parameters and demonstrate the effectiveness of our proposal.

Application of micro/nanoscale thermal radiation to thermophotovoltaic system

Thermophotovoltaic （TPV） system has been regarded as one promising means to alleviate current energy demand because it can directly generate electricity from radiation heat via photons. However, the presently available TPV systems suffer from low conversion efficiency and low throughput. A viable solution to increase their efficiency is to apply micro/nanoscale radiation principles in the design of different components to utilize the characteristics ~f thermal radiation at small distances and in microstructures. Several critical issues are reviewed, such as photovoltaic effect, quantum efficiency and efficiency of TPV system. Emphasis is given to the development of wavelength-selective emitters and filters and the aspects of micro/nanoscale heat transfer. Recent progress, along with the challenges and opportunities for future development of TPV systems are also outlined.

TI力争高速数据转换器市场龙头地位——推出总功耗只有750mW的14位125MSPS ADC-ADS5500

随着新一代应用对于高取样速度的需求日益提高，带动了高速模拟数字转换器的市场契机，据DATABEANS预估，2003-2008年全球高速转换器市场年成长率可望达到21％，市场规模预计将由2004年的5亿美元，成长至2008年的10亿美元。依地区别，到了2008年，亚洲将由目前居美国之后的地位，大幅成长而成为全球高速转换器的最大市场。

The Study of Thermal Mass as a Passive Design Technique for Building Comfort and Energy Efficiency

The day/night （diurnal） changes in temperature and solar radiation pose challenges for maintaining human thermal comfort in buildings. Passive and energy-conserving buildings seek to manage the available thermal energy by lowering peaks and dampening the fluctuations in order to maintain conditions for human comfort. Appropriate use of thermal mass moderates the internal temperatures by averaging diurnal extremes. Thermal mass is one of the powerful tools which architects and designers can use to control temperature. It can be used to optimize the performance of energy-conserving buildings that rely primarily on mechanical heating and cooling strategies. Massive building envelopes-such as masonry, concrete, earth, and insulating concrete forms （ICFs） can be utilized as one of the simplest ways of reducing building heating and cooling loads. This article analyses the role and effectiveness of thermal mass as a strategy for providing indoor thermal comfort for passive solar and energy conserving buildings.