综合使用飞行小时在飞机构件腐蚀疲劳寿命分析中的应用

飞机使用环境谱中飞行环境谱和停放环境谱的组合就是飞行─停放─飞行环境谱。大多数军用飞机地面停放时间占飞机使用寿命的90％以上。海军飞机所处的高温、高湿、高盐雾腐蚀环境对飞机使用寿命有很大影响。腐蚀疲劳直接影响疲劳裂纹形成寿命。飞机使用寿命必须应用飞机使用环境谱,考虑飞行小时、日历时间和综合使用飞行小时。列举海军某直升机主桨毂轴向铰轴颈裂纹故障,通过波音公司飞机结构疲劳分析方法,在飞行小时、日历时间和综合使用飞行小时方面对其翻修期进行了探讨。     

飞机结构铝合金材料腐蚀行为和腐蚀速率研究

本文针对海军飞机的使用腐蚀环境特点,对飞机结构高强度铝合金材料的腐蚀行为进行了研究,并用飞机大修时结构件在不同使用日历年限下的腐蚀损伤数据,建立了机场环境中腐蚀深度与飞机使用日历年限的函数关系,得到了机场环境条件下飞机结构铝合金材料的腐蚀扩展速率。     

经营性租赁飞机与融资性租赁飞机的比较分析

我国民航飞机租赁潜在市场巨大.飞机租赁是我国民航企业选择飞机融资的重要手段,它的发展情况与我国民航企业发展是息息相关的.我国民航企业如何在特定的经济环境中,选择符合自身运营发展条件的飞机租赁方式,影响着其未来发展的好坏.本文从融资租赁飞机及经营租赁飞机这两大基本租赁方式入手,对其各自的特点进行分析与对比,并对目前国内航空公司飞机引进形式的发展趋势进行论述.     

基于泊松理论的航材储备管理

随着飞行学院近几年飞机的不断引进,飞机使用时间的增加,必然对维护工作的科学化、规范化和标准化有越来越高的标准。现仅根据自己对泊松（POISSON）公式的粗浅认识,谈谈如何利用泊松（POISSON）公式,来使航材储备更加合理。     

Cessna172R飞机前轮摆振故障浅析及措施

Cessna172R飞机自引进以来，飞机前轮在滑跑过程中多次出现前路摆振，而前轮摆振对飞行安全及飞机结构件均会构成较为严重的威胁。文章通过介绍Cessna172R飞机前起落架系统结构和工作原理、分析引起前轮摆振的因素及原因，提出有效的解决措施，提高前轮摆振故障排除效率，同时能提高前起落架系统维护的可靠性，保证飞机运行安全。     

现役飞机结构腐蚀疲劳及寿命研究

文章分析研究了在环境腐蚀介质中飞机的疲劳损伤特性和基本破坏失效模式,阐述了现役军用飞机地面停放使用环境谱的编制以及在腐蚀环境条件下飞机腐蚀疲劳寿命的估算方法,并对未来几年我军飞机结构的腐蚀疲劳研究的发展提出了一些看法。     

浅析PA-44-180飞机环境系统

PA-44-180飞机环境系统主要由座舱通风和加温系统组成。主要用于向座舱提供舒适的环境,使驾驶员能够在舒适环境下正常操纵和驾驶飞机。本文主要对PA-44-180飞机加温系统的原理、使用、维护和实际工作中的故障情况进行探讨,总结对加温系统的排故经验和维护注意事项。     

单机掩蔽库群生存概率计算模型

通过引进概率可靠度分析方法，对第三代主战飞机平原机场单个单机掩蔽库在爆炸荷载作用下的生存概率进行了分析，在此基础上通过引进系统工程方法，对机库群的生存概率进行了研究，给出了机库群生存概率的计算模型。     

浅谈旋转式机械水表对计量的影响

水表计量精度的误差直接影响着供水企业和单位的经济效益和服务质量，通过水表引发出来的系列问题分析探讨，在日常计量过程中反应出来的问题认为对水表口径选择安装配置，介质环境使用期限的科学合理选择对存在不利因素，利用科学的管理手段方能提高服务质量。确保计量的科学性和准确性。     

一例典型的塞斯纳172R飞机主起落架刹车导管渗漏故障浅析

美国赛斯纳（Cessna）飞机公司生产的Cessna 172R型飞机属于全金属上单翼单发小型飞机,具有结构简单、操纵简便、维护使用方便等特点,同时还具有良好的使用经济性和安全性,因此,近年来被国内的通用航空大量引进使用。本文通过对该型飞机主起落架段刹车导管多发性的渗漏故障进行分析,初步探讨故障原因,提出预防措施,以降低该故障的发生,保证飞行安全。     

Markedness and its Interpretation in Language Use

Language markedness is a common phenomenon in languages, and is reflected from hearing, vision and sense, i.e. the variation in the three aspects such as phonology, morphology and semantics. This paper focuses on the interpretation of markedness in language use following the three perspectives, i.e. pragmatic interpretation, psychological interpretation and cognitive interpretation, with an aim to define the function of markedness.     

Features of Women's language

Language is a means of verbal communication. People use language to communicate with each other. In the society, no two speakers are exactly alike in the way of speaking. Some differences are due to age, gender, statue and personality. Above all, gender is one of the obvious reasons. The writer of this paper tries to describe the features of women＇s language from these perspectives： pronunciation, intonation, diction, subjects, grammar and discourse. From the discussion of the features of women＇s language, more attention should be paid to language use in social context. What＇s more, the linguistic phenomena in a speaking community can be understood more thoroughly.     

An Analysis of Catherine＇s Character——Wuthering Heights

Wuthering Heights, Emily Bronte＇s only novel, was published in December of 1847 under the pseudonym Ellis Bell. The book did not gain immediate success, but it is now thought one of the finest novels in the English language. Catherine is the key character of this masterpiece, because everybody and everything center on her though she had a short life. We can understand this masterpiece better if we know Catherine well.     

Lower Paleozoic oil relationships within Williston Basin, Canada

The Williston Basin is a significant petroleum province, containing oil production zones that include the Middle Cambrian to Lower Ordovician, Upper Ordovician, Middle Devonian, Upper Devonian and Mississippian and within the Jurassic and Cretaceous. The oils of the Williston Basin exhibit a wide range of geochemical characteristics defined as "oil families", although the geochemical signature of the Cambrian Deadwood Formation and Lower Ordovician Winnipeg reservoired oils does not match any "oil family". Despite their close stratigraphic proximity, it is evident that the oils of the Lower Palaeozoic within the Williston Basin are distinct. This suggests the presence of a new "oil family" within the Williston Basin. Diagnostic geochemical signatures occur in the gasoline range chromatograms, within saturate fraction gas chromatograms and biomarker fingerprints. However, some of the established criteria and cross-plots that are currently used to segregate oils into distinct genetic families within the basin do not always meet with success, particularly when applied to the Lower Palaeozoic oils of the Deadwood and Winnipeg Formation.     

低渗透非均质砂岩油藏启动压力梯度研究

理论推导与室内实验相结合,建立了低渗透非均质砂岩油藏启动压力梯度确定方法。首先借助油藏流场与电场相似的原理,推导了非均质砂岩油藏启动压力梯度计算公式。其次基于稳定流实验方法,建立了非均质砂岩油藏启动压力梯度测试方法。结果表明:低渗透非均质砂岩油藏的启动压力梯度确定遵循两个等效原则。平面非均质油藏的启动压力梯度等于各级渗透率段的启动压力梯度关于长度的加权平均;纵向非均质油藏的启动压力梯度等于各渗透率层的启动压力梯度关于渗透率与渗流面积乘积的加权平均。研究成果可用于有效指导低渗透非均质砂岩油藏的合理井距确定,促进该类油藏的高效开发。     

On Tragic Consciousness In The Works By Ernest Hemingway

As an American modern novelist who were famous in the literary world, Hemingway was not a person who always followed the trend but a sharp observer. At the same time, he was a tragedy maestro, he paid great attention on existence, fate and end-result. The dramatis personae's tragedy of his works was an extreme limit by all means tragedy on the meaning of fearless challenge that failed. The beauty of tragedy was not produced on the destruction of life, but now this kind of value was in the impact activity. They performed for the reader about the tragedy on challenging for the limit and the death.     

Design and analysis of generic LBS application developing platform

Location based services is promising due to its novel working style and contents.A software platform is proposed to provide application programs of typical location based services and support new applications developing efficiently. The analysis shows that this scheme is easy implemented, low cost and adapt to all kinds of mobile nework system.     

橡胶颗粒沥青混合料低温抗裂性试验研究

以AC-13级配为基础,将橡胶颗粒代替部分集料掺入混合料中,以低温弯曲试验为评价方法对不同橡胶颗粒掺量下沥青混合料的低温抗裂性进行研究,并引入应变能密度值对混合料的低温抗裂性进行综合评价.试验结果表明:橡胶颗粒沥青混合料试件的破坏微应变均超过2 300,满足冬寒区的技术指标;无论是否掺加橡胶颗粒,随着温度的下降,沥青混合料破坏时的最大弯拉强度增大,弯拉应变降低,劲度模量增大;弯曲应变能密度在胶粒掺量为1%左右时具有较大的弯曲应变能密度值,此时橡胶颗粒沥青混合料具有较好的低温抗裂性.     

Achieving Unusual States of Matter Under High Pressure

正The periodicity of the elements and the non-reactivity of the inner-shell electrons are two related principles of chemistry,rooted in the atomic shell structure.Within compounds,Group I elements,for example,invariably assume the+1 oxidation state,and their chemical properties differ completely from those of the p-block elements.These general rules govern our understanding of chemical structures and reactions.Using first principles calcula-     

Exchange-Correlation and Electronic Excitation Energies from Pairing Matrix Fluctuations

We have developed an adiabatic connection to formulate the ground-state exchange-correlation energy in terms of pairing matrix linear fluctuations.This formulation of the exchange-correlation energy opens a new channel for density functional approximations based on the many-body perturbation theory.We illustrate the potential of such approaches with an approximation based on the particle-particle Random Phase Approximation(pp-RPA).This re-