An acoustical evaluation of the engine test cell facilities at Misawa AB, Japan, was performed in December 2012. This assessment was accomplished to help determine overall sound pressure levels during multiple power settings of aircraft engine run-up procedures. It was determined that personnel performing these duties are exposed to hazardous noise levels. Therefore, it was recommended that engine test cell facilities should remain labeled as hazardous noise areas, personnel should be enrolled in the hearing conservation program and receive audiograms, and noise dosimetry should be performed to better characterize the cumulative noise exposures.

关键词：声学；飞机发动机的噪音；发动机试验

查看摘要 索取原文[7页]

Polymer-Electrolyte-Fuel-Cells (PEFCs) are promising candidates for powering vehicles and portable devices using renewable-energy sources. The core of a PEFC is the solid electrolyte membrane that conducts protons from anode to cathode, where water is generated. The conductivity of the membrane, however, depends on the water content of the membrane, which is strongly related to the cell operating conditions. The membrane and other cell components are typically compressed to minimize various contact resistances. Moreover, the swelling of a somewhat constrained membrane in the cell due to the humidity changes generates additional compressive stresses in the membrane. These external stresses are balanced by the internal swelling pressure of the membrane and change the swelling equilibrium. It was shown using a fuel-cell setup that compression could reduce the water content of the membrane or alter the cell resistance. Nevertheless, the effect of compression on the membranes transport properties is yet to be understood, as well as its implications in the structure-functions relationships of the membrane. We previously studied, both experimentally and theoretically, how compression affects the water content of the membrane. However, more information is required the gain a fundamental understanding of the compression effects. In this talk, we present the results of our investigation on the in-situ conductivity of the membrane as a function of humidity and cell compression pressure. Moreover, to better understand the morphology of compressed membrane, small-angle X-ray-scattering (SAXS) experiments were performed. The conductivity data is then analyzed by investigating the size of the water domains of the compressed membrane determined from the SAXS measurements.

关键词：燃料电池；固体电解质；聚合物；阳极

查看摘要 索取原文[7页]

Former Johnson Space Center engineer David Bergeron used his experience on the Advanced Refrigeration Technology Team to found SunDanzer Refrigeration Inc., a company specializing in solar-powered refrigerators. The company has created a battery-free unit that provides safe storage for vaccines in rural and remote areas around the world.

关键词：电池；电能；公共健康

查看摘要 索取原文[2页]

This paper presents background, experimental design, and preliminary experimental results for the liquid hydrogen bubble point tests conducted at the Cryogenic Components Cell 7 facility at the NASA Glenn Research Center in Cleveland, Ohio. The purpose of the test series was to investigate the parameters that affect liquid acquisition device (LAD) performance in a liquid hydrogen (LH2) propellant tank, to mitigate risk in the final design of the LAD for the Cryogenic Propellant Storage and Transfer Technology Demonstration Mission, and to provide insight into optimal LAD operation for future LH2 depots. Preliminary test results show an increase in performance and screen retention over the low reference LH2 bubble point value for a 325 2300 screen in three separate ways, thus improving fundamental LH2 LAD performance. By using a finer mesh screen, operating at a colder liquid temperature, and pressurizing with a noncondensible pressurant gas, a significant increase in margin is achieved in bubble point pressure for LH2 screen channel LADs.

关键词：液态电池；电能利用；电能存储

查看摘要 索取原文[24页]

This project, ACRP Project 11-03, Synthesis of Information Related to Airport Practices, searches out and synthesizes useful knowledge from all available sources and prepares concise, documented reports on specific topics. Reports from this endeavor constitute an ACRP report series, Synthesis of Airport Practice. This synthesis series reports on current knowledge and practice, in a compact format, without the detailed directions usually found in handbooks or design manuals. Each report in the series provides a compendium of the best knowledge available on those measures found to be the most successful in resolving specific problems.

关键词：电池；电动汽车；环保能源

查看摘要 索取原文[71页]

为了降低燃煤电厂汞污染物的排放量,基于量子化学的密度泛函理论(DFT)构建了活性炭纤维(ACF)平行四碳环模型,以研究不同含氧官能团对ACF表面吸附单质汞(Hg0)机理的影响.理论计算结果表明:2个位于相邻或相近活性位含同一含氧官能团的ACF表面吸附Hg0的吸附能基本相同;内酯、羰基和半醌官能团使ACF表面对Hg0的吸附为化学吸附;羧基、酚羟基官能团则抑制ACF表面对Hg0的吸附;理论计算结果与试验结果一致,表明密度泛函理论是研究汞吸附性能的一种有效方法。

关键词：密度泛函理论；汞吸附；活性炭纤维；含氧官能团；活性炭；活性位

查看摘要 索取原文[6页]

蓄热堆积床是否具有高效蓄、放热能力是太阳能热发电技术的关键.根据高温蓄热球与载热流体间的能量平衡,考虑载热流体与蓄热球之间的换热系数,以及相变材料密度的变化,建立了堆积床放热过程的数学模型,并进行了数值模拟,讨论了载热流体流速、相变材料初温、蓄热球半径和孔隙率对蓄热堆积床放热过程的影响.结果表明:载热流体流速越快,蓄热堆积床放热速率越大;孔隙率越小,越不利于蓄热单元散热,但对堆积床整体放热和蓄热有利;相变材料初温仅对显热放热阶段有影响,降低初温,可缩短整体放热时间;蓄热球半径越小,蓄热堆积床放热速率越快,蓄热量也越大。

关键词：太阳能热发电；蓄热堆积床；高温蓄热球；载热流体；放热速率；换热系数

查看摘要 索取原文[7页]

The charging station of battery replaceable EV is used as measures for voltage control for a distribution network with large penetration of PVs. Stochastic optimal operation method of the charging station which maintains voltage of a distribution network and can replace batteries is studied. In addition, the battery usage fee is evaluated to get incentive to both EV users and the charging station to demonstrate usefulness of battery replaceable EV.

关键词：光伏；分销网络；电压控制

查看摘要 索取原文[5页]

以某1000MW机组汽轮机末级叶片为对象,采用CFX软件对该汽轮机末两级叶栅内凝结流动及水滴沉积过程进行了数值模拟,计算分析了除湿缝的缝隙位置、角度、宽度及数目对除湿效率、二次水滴去除率和级效率的影响.结果表明:为保证末级叶片同时具有较好的除湿性能、级效率和静叶刚度,除湿缝结构应设计在相对叶高60%以上,且在压力面和吸力面相对叶宽80.6%和29.2%处;除湿缝角度选取45°,除湿缝宽度采用1.0mm;若不考虑空心静叶的强度问题,单段除湿缝的综合性能更优;当开缝面积相同时,双缝除湿缝的各项性能均更优;当开缝宽度相同时,单缝除湿缝的综合性能更优。

关键词：1000MW机组；汽轮机；末级叶片；空心静叶；除湿；缝隙结构；数值模拟

查看摘要 索取原文[6页]

目前,我国电站锅炉回转式空气预热器(空预器)普遍存在漏风率较高、运行可靠性较低等问题.空预器的密封型式是决定其漏风率的关键因素.为此,对回转式空预器的不同密封型式进行了详细介绍和比较.从实际应用效果来看:空预器采用多密封技术配以可调式密封系统,其漏风率较低;采用柔性密封技术后及时进行检修更换,也能将漏风率控制在较低水平;间隙自补偿密封、疏导密封和加压密封目前应用较少,其可靠性及应用效果仍需观察。

关键词：回转式；空气预热器；密封技术；漏风率；可靠性

查看摘要 索取原文[7页]