超音速军用航空发展综述

简述了超音速军用航空发展的重要意义和作用。阐明了国内外超音速军用飞机的发展历史和现状 ,展望了它们的发展趋势。并指出按照我国目前实际情况 ,走研制与引进军机相结合的道路是十分正确的。对研究加快发展我国空军现代武器装备的战略有参考价值     

国际民航组织适航标准与中国民航适航规章的关联

 从国际民航组织现行适航文件体系入手，研究了《国际民用航空公约》的附件8《航空器适航性》中型号合格审定、制造、适航证、持续适航和安全管理方面对各缔约国的适航标准。解析了其与中国民航现行适航规章《民用航空产品和零部件合格审定规定》（CCAR-21-R4）的区别与联系。阐明了《航空器适航性》（第12版）的主要修订内容及修订方向。     

MSG-3维修思想军用化的可行性分析

当前,MSG-3思想在民用飞机上有较为成熟系统的应用。该文通过分析基于MSG-3民机维修大纲制定流程,逐层对比与军用飞机大纲制定标准的不同,从而研究MSG-3思想在军机上应用的可行性。进行对比分析后,找出MSG-3不适用于军用飞机的部分,并有针对性地讨论改良方法,得出适用且有效的维修指导思想,从而达到MSG-3军用化的目的。     

军用飞机仿制与改型研制费用的类比修正函数

国产军用飞机有相当部分机型是通过仿制与改型研制的,这样的样本不能直接用于新研型号研制费用的统计分析。为了弥补当前国产军用飞机研制费用建模样本的不足,以国产4个机种17个机型的改型研制工作量和改型费用数据的统计为基础,定义了修正类比函数,构建了函数形式,进而根据统计数据给出了函数的参数估计,用于修正仿制与改型型号的研制费用。进一步利用偏最小二乘回归方法的数据分析工具对结果进行了验证。     

浅析机载产品适航性

我国民用航空器良好的飞行性能往往决定于该民用航空器机载产品的适航性。良好的飞行性能,能够很大的程度上保障民用航空器飞行安全,机载产品只有全面完成适航符合性验证取得适航证,才能进入市场。本文着重讲述了民用航空器产品的适航性及其分析方法,全面论述了其适航性的重要性。     

徐舜寿我国飞机设计研制的开拓者

在中国航空工业尤其是飞机设计事业的发展历程中,徐舜寿有着里程碑式的地位与贡献。他是我国飞机设计研制的开拓者和第一个飞机设计研究机构的创建人之一,培养了大批科技人才。他曾组织主持完成各类军用飞机的设计任务并解决了多项尖端技术,为我国航空工业的建设和发展作出了重要贡献。     

舰载机维修级别选定及关键技术分析

 舰载机维修保障系统间相关因素较多,维修复杂程度较高。提高舰载机的维修保障效能,尤其是改进维修体制、维修方式,已成为军事装备领域研究的热点问题之一。合理构建舰载机的维修体制,是提高舰载机战备完好性、降低其寿命周期费用的有效途径。对比了国内外军机维修在三级维修体制与两级维修体制下的运行方式,分析了三级维修的弊端;借鉴国外军用飞机的维修理念,针对中国舰载机维修保障的特点和存在问题,探讨了舰载机实行两级维修的运行模式及相关的关键环节。     

中国歼7战机走向世界

成飞集团公司经30余年研制、生产、改进歼7系列飞机,取得了丰硕成果,不仅使飞机能适应现代化战争的需要,还走出了一条国产军机外贸出口的新路子。     

技术状态管理在航空发动机中的应用

为加强航空发动机研制的过程控制,提高产品质量,该文对国内发动机研制的技术状态管理现状进行分析,并在工程实践经验的基础上,参照美国技术状态管理手册等标准指出了在发动机型号研制、生产和使用过程中技术状态标识、技术状态控制、技术状态记实、技术状态审核工作的具体实施内容以及需要重点关注的工作,为后续发动机研制及其他系统工程领域开展技术状态管理工作提供参考。     

基于区间直觉模糊和证据理论的军机研制风险评估

文章针对军机研制过程中不确定性因素多、风险大的问题,根据"证据折扣"思想,提出了一种基于区间直觉模糊和改进D-S证据理论的风险评估方法。首先,构建了军机研制风险评估指标体系,提出了基于指标不确信度的Mass函数构建方法;然后,提出了基于区间直觉模糊熵的指标权重确定方法,将各要素的指标集关于评语集的评估证据进行修正与合成;最后,提出了融合冲突系数和Jousselme距离的证据冲突度计算方法并以此度量要素权重,将各要素关于评语集的评估证据进行修正与合成,确定了风险等级。算例结果验证了方法的可行性和有效性。     

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.     

Characterization of Ordovician carbonate reservoirs, southeastern Saskatchewan, Canada

The discovery of the prolific Ordovician Red River reservoirs in 1995 in southeastern Saskatchewan was the catalyst for extensive exploration activity which resulted in the discovery of more than 15 new Red River pools. The best yields of Red River production to date have been from dolomite reservoirs. Understanding the processes of dolomitization is, therefore, crucial for the prediction of the connectivity, spatial distribution and heterogeneity of dolomite reservoirs.The Red River reservoirs in the Midale area consist of 3～4 thin dolomitized zones, with a total thickness of about 20 m, which occur at the top of the Yeoman Formation. Two types of replacement dolomite were recognized in the Red River reservoir: dolomitized burrow infills and dolomitized host matrix. The spatial distribution of dolomite suggests that burrowing organisms played an important role in facilitating the fluid flow in the backfilled sediments. This resulted in penecontemporaneous dolomitization of burrow infills by normal seawater. The dolomite in the host matrix is interpreted as having occurred at shallow burial by evaporitic seawater during precipitation of Lake Almar anhydrite that immediately overlies the Yeoman Formation. However, the low δ18O values of dolomited burrow infills (-5.9‰～ -7.8‰, PDB) and matrix dolomites (-6.6‰～ -8.1‰, avg. -7.4‰ PDB) compared to the estimated values for the late Ordovician marine dolomite could be attributed to modification and alteration of dolomite at higher temperatures during deeper burial, which could also be responsible for its 87Sr/86Sr ratios (0.7084～0.7088) that are higher than suggested for the late Ordovician seawaters (0.7078～0.7080). The trace amounts of saddle dolomite cement in the Red River carbonates are probably related to "cannibalization" of earlier replacement dolomite during the chemical compaction.     

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.     

A computer generator for randomly layered structures

AcomputergeneratorforrandomlylayeredstructuresYUJia shun1,2,HEZhen hua2(1.TheInstituteofGeologicalandNuclearSciences,NewZealand;2.StateKeyLaboratoryofOilandGasReservoirGeologyandExploitation,ChengduUniversityofTechnology,China)Abstract:Analgorithmisintrod…     

An Index mechanism for multi-scale view in spatial databases

There are numerous geometric objects stored in the spatial databases. An importance function in a spatial database is that users can browse the geometric objects as a map efficiently. Thus the spatial database should display the geometric objects users concern about swiftly onto the display window. This process includes two operations:retrieve data from database and then draw them onto screen. Accordingly, to improve the efficiency, we should try to reduce time of both retrieving object and displaying them. The former can be achieved with the aid of spatial index such as R-tree, the latter require to simplify the objects. Simplification means that objects are shown with sufficient but not with unnecessary detail which depend on the scale of browse. So the major problem is how to retrieve data at different detail level efficiently. This paper introduces the implementation of a multi-scale index in the spatial database SISP (Spatial Information Shared Platform) which is generalized from R-tree. The difference between the generalization and the R-tree lies on two facets: One is that every node and geometric object in the generalization is assigned with a importance value which denote the importance of them, and every vertex in the objects are assigned with a importance value,too. The importance value can be use to decide which data should be retrieve from disk in a query. The other difference is that geometric objects in the generalization are divided into one or more sub-blocks, and vertexes are total ordered by their importance value. With the help of the generalized R-tree, one can easily retrieve data at different detail levels.Some experiments are performed on real-life data to evaluate the performance of solutions that separately use normal spatial index and multi-scale spatial index. The results show that the solution using multi-scale index in SISP is satisfying.     

Jane Eyre——A Feminist In The 19th Century

In the 19th century the society was controlled by men, and women were just appendants of them, they had not any rights and freedom. But Jane was an exception, she showed some characteristics of early feminist. Jane showed her characteristics of feminism in three aspects: rebellion, equality, and independence. These characteristics were helpful to her success, and feminism is the only way out for women of that time.     

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-