某型飞机襟翼控制系统分析与改进措施

该文以某型水陆两栖飞机襟翼控制系统为例,对于在地面试验和试飞过程中暴露出襟翼偏摆不定等问题,进行设计改进,部分改进通过机上地面试验及飞行试验已证明其有效性。     

限位器模具结构改进设计

通过分析限位器的原工艺方案及模具结构,针对其在生产中出现的多种问题,提出改进方案.改进后的工艺与模具结构与原来相比,提高了生产效率和操作安全性,降低了生产成本.     

NUMERICAL MANIFOLD METHOD AND ITS APPLICATION IN UNDERGROUND OPENINGS

IntroductionTheNumericalManifoldMethod(NMM)inrockmechanicsisanewnumericalanalysismethodproposedbyShiG..h..[1],followingDiscontinuousDeformationAnalysis(DDA).Basedontopologicalmanifold,itappliedfinitecovertechniqueandtakenintheadvantagesofFiniteElementMethod(FEM)andDDA.Themethodunifiedcontinuousmechanicsanddiscontinuousoneintoasystem,byestablishinggeneralcoverfunctionsoneachphysicalcoverinanalysisregionandweightingthefunctionstoformtheglobaldisplacementfunction.ThismethodcontainsFEMa…     

高低压泄压系统在密闭输油中的应用

介绍了高低压泄压系统的作用、组成、结构及工作原理,分析了应用中泄压阀出现故障的原因和处理方法,提出了在使用过程中应注意的问题及对日常维护的要求,为保证泄压阀的安全运行,在原系统的基础上,对其进行了一些改进和完善。     

ADC发泡剂生产装置节水措施

介绍了ADC发泡剂生产中为节约水资源所进行的工艺改进情况。改造后,水资源循环利用,大大降低了生产成本。     

Improving the energy performance of UK households: Results from surveys of consumer adoption and use of low- and zero-carbon technologies

This paper presents results from a UK Open University project which surveyed consumers’ reasons for adoption, and non-adoption, of energy efficiency measures and renewable energy systems—collectively called low- and zero-carbon technologies—and their experiences of using these technologies. Data were gathered during 2006 via an online questionnaire with nearly 400 responses, plus 111 in-depth telephone interviews. The respondents were mainly environmentally concerned, ‘green’ consumers and therefore these are purposive rather than representative surveys. The paper outlines results for four energy efficiency measures (loft insulation, condensing boilers, heating controls and energy-efficient lighting) and four household renewables (solar thermal water heating, solar photovoltaics, micro-wind turbines and wood-burning stoves). These green consumers typically adopted these technologies to save energy, money and/or the environment, which many considered they achieved despite rebound effects. The reasons for considering but rejecting these technologies include the familiar price barriers, but there were also other obstacles that varied according to the technology concerned. Nearly a third of the surveyed consumers had adopted household renewables, over half of which were wood stoves and 10% solar thermal water heating systems. Most adopters of renewables had previously installed several energy efficiency measures, but only a fifth of those who seriously considered renewables actually installed a system. This suggests sell energy efficiency first, then renewables. There seems to be considerable interest in household renewables in the UK, especially among older, middle-class green consumers, but so far only relatively few pioneers have managed to overcome the barriers to adoption.     

Theoretical analysis of reactant dosing concepts to perform parallel-series reactions

The possibility of enhancing selectivities and yields in networks of parallel and series reactions is investigated theoretically. Isothermal tubular reactors are considered where reactants can be introduced at the entrance and also over the wall. The latter way of dosing could be realised, e.g., in a membrane reactor where one or several reactants can be dosed through a porous reactor wall. Besides numerical solutions of the underlying mass balance equations of simplified reactor models, instructive analytical solutions were derived which are valid under certain constraints. Using these solutions an optimisation of the reactor performance could be performed. As objective function the molar fraction of a desired intermediate product at the reactor outlet was maximised. The impact of influencing via the dosing strategy applied the local composition (and thus the local reaction rates) and the component residence time distributions is elucidated.     

A Relay-Based MAC Protocol for Multi-Rate and Multi-Range Infrastructure Wireless LANs

Auto rate adaptation mechanisms have been proposed to improve the throughput in wireless local area networks with IEEE 802.11a/b/g standards that can support multiple data rate at the physical layer. However, even with the capability of transmitting multi-packets with multi-rate IEEE 802.11 PHY, a mobile host near the fringe of the Access-Point's (AP's) transmission range still needs to adopt a low-level modulation to cope with the lower signal-to-noise ratio (SNR), Thus, it can not obtain a data rate as high as that of a host near AP in most cases. According to the characteristics of modulation schemes, the highest data rate between a pair of mobile hosts will be inversely proportional with the transmission distance. Considering these factors, we here demonstrate a Relay-Based Adaptive Auto Rate (RAAR) protocol that can find a suitable relay node for data transmission between transmitter and receiver, and can dynamically adjust its modulation scheme to achieve the maximal throughput of a node according to the transmission distance and the channel condition. The basic concept is that the best modulation schemes are adaptively used by a wireless station to transmit an uplink data frame, according to the path loss condition between the station itself and a relay node, and that between the relay node and AP, thus delivering data at a higher overall data rate. Evaluation results show that this scheme provides significant throughput improvement for nodes located at the fringe of the AP's transmission range, thus remarkably improving overall system performance. Jain-Shing Liu was born in Taipei, Taiwan, in 1970. He received the Ph.D. degree in Department of Computer and Information Science, National Chiao Tung University, Hsinchu, Taiwan. He is currently with the faculty of the Department of Computer Science and Information Management, Providence University, Taichung, Taiwan 433, ROC. His research interests include wireless communication protocol design, performance analysis and modeling, personal communication networks, and distributed simulation. Dr. Liu is a member of IEEE and IEICE. Chunhung Richard Lin was born in Kaohsiung, Taiwan. He received the B.S. and M.S. degrees from the Department of Computer Science and Information Engineering, National Taiwan University, in 1987 and 1989, respectively, and the Ph.D. degree from Computer Science Department, University of California, Los Angeles (UCLA), in 1996. Dr. Lin joined National Chung Cheng University in Taiwan in 1996. Since August 2000, he has been with the Department of Computer Science and Engineering, National Sun Yat-Sen University, Kaohsiung, Taiwan. His research interests include the design and control of personal communication networks, protocol design and implementation for differentiated/integrated services in mobile wireless networks, mobile Internet, distributed simulation, and embedded operating system design and implementation. His email address is: lin@cse.nsysu.edu.tw. Dr. Lin is an ACM member. He received the 2001 Junior Professor Research Award from National Sun Yat-Sen University and the 2000 Investigative Research Award from the Pan Wen Yuan Foundation, Taiwan, ROC.     

谢尔气化工艺SGP

系统地介绍了谢尔气化工艺（ＳＧＰ）及工艺特点、工艺改进等。     

影响CLINSULF~硫回收装置正常运行的因素

介绍了淮化新系统CLINSULF~硫回收装置,对影响装置正常运行的因素进行了分析,并针对这些影响因素实施一些改进措施。