The existing wired monitoring systems for edible fungus cultivation has some shortcomings such as complex wiring,unsatisfied function,low automatic level and so on.This paper developed a composite environment monitoring system for edible fungus cultivation based on wireless sensor network with ZigBee technology.Through a star wireless sensor network topology,this system acquired the temperature and humidity of cultivation environment,as well as thegrowing image of edible fungus.Meanwhile,according to the growing nature of edible fungus,a control strategy for cultivation environment was developed and integrated in the system.The proposed composite environment monitoring system provided a good solution for edible fungus cultivation industry.

关键词：无线个域网技术；食用菌栽培；监测系统

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Routing problem is one of the most important issues to a wireless sensor network (WSN).It is the key problem to find an efficient energy strategy for prolonging network's lifetime because power supply might be impossible.This paper discusses the multicast routing problem of WSN with multiple QoS constraints,which may deal with the delay,bandwidth,hop count and packet reception rat and surplus energy metrics,and finds a minimum resource consumption path while satisfying multiple constraints optimization conditions,and describes a network model for researching the multicast routing problem.It presents a dynamic multicast routing algorithm with multiple QoS constraints (MCQoSRA).The MCQoSRA successfully solves the QoS routing problems when multicast nodes change dynamically in the networks.The MCQoSRA only requires the local state information of the link (or node),but does not require any global network sate to be maintained.In MCQoSRA,a multicast group member can join or leave the multicast session dynamically.The MCQoSRA can effectively decrease the overhead for constructing a multicast tree and the delay of the nodes,and improve the success ratio of seeking links.Simulation results show that the MCQoSRA provides an available means to implement muiticast routing,and adapt to all kinds of the topology networks,and have better expansibility.

关键词：传感器网络；QoS；多播路由；能量

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As a first step towards a microscopic understanding of single-Pt atom-dispersed catalysts on non-conventional TiN supports, we present density- functional theory (DFT) calculations to investigate the adsorption properties of Pt atoms on the pristine TiN(100) surface, as well as the dominant influence of surface defects on the thermodynamic stability of platinized TiN. Optimized atomic geometries, energetics, and analysis of the electronic structure of the Pt/TiN system are reported for various surface coverages of Pt. We find that atomic Pt does not bind preferably to the clean TiN surface, but under typical PEM fuel cell operating conditions, i.e. strongly oxidizing conditions, TiN surface vacancies play a crucial role in anchoring the Pt atom for its catalytic function. Whilst considering the energetic stability of the Pt/TiN structures under varying N conditions, embedding Pt at the surface N-vacancy site is found to be the most favorable under N-lean conditions. Thus, the system of embedding Pt at the surface N-vacancy site on TiN(100) surface could be a promising catalyst for PEM fuel cells.

关键词：燃料电池；非常规；铂催化剂

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This research project sought to develop a prototype hydrogen-based fuel cell system for ITS devices. The project investigated hydrogen storage capacities of the various candidate chemical hydride analogs; selected the most efficient of the candidates for energy storage based on volume, mass, and cost; developed a prototype system; and estimated the capital and operating cost for such a system. A hydrogen fuel cell combines hydrogen and oxygen to produce electricity, providing a clean, high-efficiency energy source that circumvents the problems associated with conventional batteries. A major drawback that limits its utility, however, is the use of heavy and bulky compressed metal cylinders as the source of hydrogen. The chemical-based hydrogen generation used in this project can provide a compact, atmospheric-pressure storage option for the controlled release of hydrogen. Many ITS-based applications can be envisaged with hydrogen-based fuel cells, such as alternating-traffic signs, directional signals, speed-limit signs, blinkers in series, warning blinkers, and backup power sources at traffic signals during power outages. This system is particularly attractive because many remote traffic signals on northern Minnesota roads lack access to a power grid, requiring the use of batteries that must be changed often, thus incurring maintenance costs.

关键词：燃料电池；氢的生成与存储；原型系统

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In order to obtain the availability of roads and bridges after earthquake,a real-time monitoring system is build by wireless sensor networks.And a new key management scheme is proposed to protect the safety of the system.The scheme is based on the polynomial and the Chinese Remainder Theorem,divided into three stages which are system initialization,key establishment,node join and revocation.Analysis shows that the new scheme greatly reduces the storage space and the energy consumption of calculation and communication of node.It is suitable for post-disaster road monitoring system.

关键词：传感器网络；密钥管理方案；灾后道路；监测系统

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Currently, carbon is the preferred support material for platinum catalyst particles used in polymer electrolyte fuel cells (PEFCs). Carbon possesses qualities needed for a fuel cell catalyst: high surface area and conductivity, but is unacceptable as it is prone to oxidization by carbon dioxide in the fuel cell environment. Molybdenum Carbides is known to have the required conductivity.

关键词：燃料电池；等离子体；碳化钼

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Through the American Recovery and Reinvestment Act (the Recovery Act or ARRA), the United States Department of Energy (DOE) funded several projects to deploy polymer electrolyte membrane (PEM) fuel cells in forklift and backup power applications. DOE invested $9.7 million to deploy fuel cells in forklifts and an additional $11.8 million was contributed through industry cost shares, for a total investment of $21.5 million in forklift projects. DOE invested $18.5 million to deploy fuel cells in backup power projects and an additional $30.8 million was contributed through industry cost shares, for a total investment of $49.3 million in backup power projects.

关键词：燃料电池；叉车；备用电源；美国复苏；再投资；燃料电池配置；经济影响

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This guide helps users get started with the U.S. Department of Energy/National Renewable Energy Laboratory Fuel Cell Power (FCPower) Model Version 2, which is a Microsoft Excel workbook that analyzes the technical and economic aspects of high-temperature fuel cell-based distributed energy systems with the aim of providing consistent, transparent, comparable results. This type of energy system would provide onsite-generated heat and electricity to large end users such as hospitals and office complexes. The hydrogen produced could be used for fueling vehicles or stored for later conversion to electricity.

关键词：燃料电池；系统设计；建模；分布式能源系统

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Ennoblement, a positive shift in corrosion potential, due to biofilm formation is the basis of patents for biofilm monitoring and power generating devices. Ennoblement is a global phenomenon that is routinely cited as a mechanism for microbiologically influenced corrosion of some passive alloys. Increased corrosion is attributed to acceleration of the oxygen reduction reaction via several potential mechanisms that have been debated for decades. Because the phenomenon is predictable and reproducible at specific locations, ennoblement is the basis for patented methods and devices for monitoring biofilm formation and relating ennobled potentials to increased likelihood of corrosion and for evaluating cleaning and biocide treatments. Furthermore, when anodes and cathodes can be separated, as in a microbial fuel cell, biofilm formation on the cathode increases the potential difference between the two and the resulting power output. Most patented fuel cells using metal cathodes do not refer specifically to ennoblement in the disclosures.

关键词：燃料电池；生物膜强化；潜在；腐蚀；电能源指标

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The development of a room temperature (<50 C) fuel cell that would use a generally available fuel such as JP8 would be most valuable. However there are no known catalysts that can selectively activate the CC bonds of such fuels at such temperature. The goal of this project was to investigate whether it is plausible to develop such catalysts. To do this we used validated first-principles (quantum mechanics) based simulations to investigate the barriers for alkyl carbon-carbon cleavage for two prototypical systems: A metal alloy catalyst and an organometallic cluster catalyst. That might serve as an anode for electrochemical power generation. For the metal alloy catalyst we used a top-down approach where we determined the bond energies to the alloy catalyst to various fuel fragments necessary to achieve room temperature decomposition of butane and oxidation to CO2. For organometallic cluster catalyst we used a bottom-up strategy, determining specific metals, ligand compositions, solvents and operating conditions to evaluate which conditions could lead to reasonable rates at room temperature.

关键词：燃料电池；低温催化；便携式电源；C-C键

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